Disclosed is an organic/inorganic composite porous film comprising: (a) inorganic particles; and (b) a binder polymer coating layer formed partially or totally on surfaces of the inorganic particles, wherein the inorganic particles are interconnected among themselves and are fixed by the binder polymer, and interstitial volumes among the inorganic particles form a micropore structure. A method for manufacturing the same film and an electrochemical device including the same film are also disclosed. An electrochemical device comprising the organic/inorganic composite porous film shows improved safety and quality.
The present invention is a method for producing a microporous polyolefin resin sheet, in which a solution obtained by mixing a polyolefin resin and a diluent is discharged into the shape of a sheet from a discharge mouth to a cooling and solidification device while air between the sheet and the cooling and solidification device is suctioned out in a suction chamber, and the sheet is cooled, wherein dripping of a liquefied material of a polymer low-molecular-weight component, diluent, or additive adhered to a rectification plate arranged within a decompression chamber, and prevents the occurrence of sheet defects. A microporous polyolefin resin sheet manufacturing device is used, which is provided with: a discharge mouth for discharging, in the shape of a sheet, a solution obtained by mixing a polyolefin resin and a diluent; a cooling and solidification device for cooling the sheet discharged from the discharge mouth; and a decompression chamber for suctioning air between the sheet and the cooling and solidification device. The rectification plate is arranged in the decompression chamber interior, and the interior of the decompression chamber and the interior of the rectification plate are each suctioned to keep the pressure inside the rectification plate lower than the pressure in the decompression chamber, whereby liquefied material of a polymer low-molecular weight component, diluent, or additive adhered to the rectification plate is forcibly sucked and removed to the inside the rectification plate.
B29C 47/88 - Heating or cooling the stream of extruded material
B29C 41/24 - Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of indefinite length
B29C 41/34 - Component parts, details or accessories; Auxiliary operations
B29C 47/08 - Component parts, details or accessories; Auxiliary operations
C08J 9/28 - Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum
C08L 23/00 - Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
B29K 23/00 - Use of polyalkenes as moulding material
B29K 105/04 - Condition, form or state of moulded material cellular or porous
A method for producing a microporous polyolefin resin sheet exhibiting excellent thickness uniformity and quality of appearance is provided, which employs a reduced-pressure chamber to enable a sheet exhibiting uniform crystallization to be stably formed even if the speed of a cast cooling device is increased. This device for producing a microporous polyolefin resin sheet is provided with: a mouthpiece for extruding a molten resin into a sheet shape; a cast cooling device for cooling and solidifying the extruded sheet, while conveying the extruded sheet; a reduced-pressure chamber which is disposed further towards the upstream side than the mouthpiece in the conveyance direction of the cast cooling device, and which is for sucking air from the space between the cast cooling device and the extruded sheet; and rectification plates which are disposed so as to occlude gaps between a cast surface and the discharged sheet. The reduced-pressure chamber is provided with: a seal material which is provided to at least a peripheral section of the surface facing the cast cooling device, and which is in physical contact with the cast cooling device; and a partition plate which is provided along the width direction of the sheet, and in the vicinity of an opening facing the mouthpiece.
B29C 47/88 - Heating or cooling the stream of extruded material
B29C 41/26 - Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of indefinite length by depositing flowable material on a rotating drum
B29C 41/34 - Component parts, details or accessories; Auxiliary operations
C08J 9/28 - Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum
4.
MICROPOROUS POLYOLEFIN FILM, SEPARATOR FOR BATTERY, AND PRODUCTION PROCESSES THEREFOR
A microporous polyolefin film which has a width of 100 mm or greater and has a width of variations in transverse-direction F25 value of 1 MPa or less, and which is suitable for forming a porous layer reduced in thickness unevenness. (The term F25 value means a value obtained by examining a test piece using a tensile tester to measure a load at the time when the test piece has elongated by 25% and dividing the load by the cross-sectional area of the test piece.)
C08J 9/28 - Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum
B32B 5/32 - Layered products characterised by the non-homogeneity or physical structure of a layer characterised by the presence of two or more layers which comprise fibres, filaments, granules, or powder, or are foamed or specifically porous both layers being foamed or specifically porous
H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material
5.
POLYOLEFIN MICROPOROUS MEMBRANE AND METHOD FOR MANUFACTURING SAME, SEPARATOR FOR NONAQUEOUS-ELECTROLYTE SECONDARY CELL, AND NONAQUEOUS-ELECTROLYTE SECONDARY CELL
Provided is a microporous membrane having an excellent balance of temperature characteristics, shrinkage characteristics, permeability, and strength, and a separator for a nonaqueous-electrolyte secondary cell having high performance and excellent safety, and a nonaqueous-electrolyte secondary cell are thereby realized. A polyolefin microporous membrane characterized in that the difference between the shutdown shrinkage temperature and the maximum shrinkage temperature thereof in the TD direction measured by TMA is 7.2°C or greater, the difference between the shutdown shrinkage rate and the maximum shrinkage rate thereof in the TD direction is less than 25%, the piercing strength thereof when the membrane thickness is 16 µm is 400 gf or greater, and the ratio of the piercing strength and the air impermeability thereof when the membrane thickness is 16 µm is 2.0 to 4.0 (gf/(sec/100 cc)).
C08J 9/28 - Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum
H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material
POLYOLEFIN MICROPOROUS FILM AND METHOD FOR MANUFACTURING SAME, SEPARATOR FOR NONAQUEOUS ELECTROLYTE SECONDARY CELL, AND NONAQUEOUS ELECTROLYTE SECONDARY CELL
Provided is a polyolefin microporous film having pores with small diameters and excellent shutdown characteristics, and which is suitable for a separator for a nonaqueous electrolyte secondary cell. The polyolefin microporous film is characterized in that the difference between the shutdown start temperature in the MD direction and the temperature at maximum shrinkage in the MD direction is 8.6°C or greater, and the maximum pore diameter thereof is less than 0.036 µm. Also provided is a method for manufacturing the polyolefin microporous film, characterized by comprising melt-kneading and molding into a sheet shape a plasticizer and a polyolefin resin including an ultrahigh-molecular-weight polyolefin, stretching the resultant sheet in the MD direction and performing simultaneous biaxial stretching thereof, and then drying the stretched sheet.
C08J 9/26 - Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a solid phase from a macromolecular composition or article, e.g. leaching out
H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material
Provided is a polyolefin multilayer microporous film that has a low air permeability value, maintains high porosity and mechanical strength even when formed into a thin film, possesses exceptional impedance characteristics, and has exceptional cell characteristics when used as a cell separator. A polyolefin multilayer microporous film including at least a first microporous layer and a second microporous layer, wherein the polyolefin multilayer microporous film is characterized in that the first microporous layer comprises a first polyolefin resin that contains polypropylene, the second microporous layer comprises a second polyolefin resin that contains an ultrahigh-molecular-weight polyethylene, and the following requirements (I) and (II) are satisfied. (I) The film thickness is 25 μm or less, and the film thickness (μm) and the porosity (%) satisfy the following relationship. Porosity (%)/film thickness (μm) ≥ 3.0...(Formula) (II) The air permeability calculated for a thickness of 16 µm is 100 sec/100 cm3 to 300 sec/100 cm3.
B32B 5/32 - Layered products characterised by the non-homogeneity or physical structure of a layer characterised by the presence of two or more layers which comprise fibres, filaments, granules, or powder, or are foamed or specifically porous both layers being foamed or specifically porous
C08J 9/00 - Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
C08J 9/28 - Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum
H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material
8.
POLYOLEFIN MICROPOROUS MEMBRANE, SEPARATOR FOR CELL, AND CELL
The present invention provides a polyolefin microporous film in which it is possible to prevent degradation in the air permeability of a separator due to high-pressure press-working during the procedure of manufacturing a cell, the polyolefin microporous film having exceptional compression resistance. In addition, using this polyolefin microporous film makes it possible to provide a cell having exceptional cycle characteristics. A polyolefin microporous film in which the rate of change in the air permeation resistance after 5 minutes of heat-compression at a temperature of 90°C and a pressure of 5.0 MPa is 50% or less, and the rate of change in the film thickness after 5 minutes of heat-compression at a temperature of 90°C and a pressure of 5.0 MPa is 10% or less in relation to the film thickness of the polyolefin microporous film before the heat-compression.
H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material
C08J 9/28 - Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum
The present invention provides a battery separator on the assumption that battery separators will become increasingly thin and cost less in the future. This battery separator has extremely high peel strength with respect to a modified porous layer, is suitable for high-speed processing in slit processing and battery assembly processing, has excellent shutdown characteristics, and is suitable for a lithium ion battery. The battery separator comprises: a layered polyethylene microporous membrane in which at least two layers of a polyethylene microporous membrane are layered; and a modified porous layer that is present on at least one of the surfaces of the layered polyethylene microporous membrane. The layered polyethylene microporous membrane has a shutdown temperature of 128-135 °C, exhibits an air permeation resistance increase rate of less than 1.5 sec/100 cc air/°C from 30 °C to 105 °C as calculated by converting to a thickness of 20 µm, and comprises 3 to 200 protrusions per cm2 that comprise polyethylene and that are present in an irregular manner on at least one outwardly facing surface thereof. The protrusions satisfy 0.5 µm ≤ H (H represents the height of the protrusions) and 5 µm ≤ W ≤ 50 µm (W represents the size of the protrusions). The modified porous layer is layered on the surface of the layered polyethylene microporous membrane that comprises the protrusions. The battery separator also comprises a binder that has a tensile strength of 5 N/mm2 or more and inorganic particles.
The present invention provides a battery separator on the assumption that battery separators will become increasingly thin and cost less in the future. This battery separator has extremely high peel strength with respect to a modified porous layer, is suitable for high-speed processing in slit processing and battery assembly processing, has excellent meltdown characteristics, and is suitable for a lithium ion battery. The battery separator comprises a layered polyolefin microporous membrane and a modified porous layer that is present on at least one of the surfaces of the layered polyolefin microporous membrane. The layered polyolefin microporous membrane is a microporous layered body that comprises at least a layer (A) and a layer (B), that has a meltdown temperature of 165 °C or more and an air permeation resistance of 300 sec/100 cc air, and that comprises 3 to 200 protrusions per cm2 that comprise a polyolefin and that are present in an irregular manner on at least one outwardly facing surface thereof. The protrusions satisfy 0.5 µm ≤ H (H represents the height of the protrusions) and 5 µm ≤ W ≤ 50 µm (W represents the size of the protrusions). The modified porous layer is layered on the surface of the layered polyolefin microporous membrane that comprises the protrusions. The battery separator also comprises a binder that has a tensile strength of 5 N/mm2 or more and inorganic particles.
The objective of the present invention is to provide a polyolefin microporous film which has excellent shutdown characteristics and mechanical strength, while having excellent thermal shrinkage characteristics at high temperatures, and which enables excellent prevention of short circuit in a battery. A polyolefin microporous film which is mainly composed of a polyolefin resin and has a thermal shrinkage in the width direction of from -0.1% to 0.4% after being processed at 60°C for 4 hours in the form of a film roll.
C08J 9/28 - Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum
C08J 9/00 - Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material
12.
POLYOLEFIN MULTILAYER MICROPOROUS MEMBRANE AND BATTERY SEPARATOR
Provided are a polyolefin multilayer microporous membrane and a battery separator having exceptional mechanical strength and heat resistance. This polyolefin multilayer microporous membrane has at least three layers, including a first microporous layer (a surface layer) comprising a polyethylene resin that contains an ultra-high-molecular-weight polyethylene, and second microporous layer (an intermediate layer) comprising a polyolefin resin that contains a high-density polyethylene and polypropylene, (I) the piercing strength being 25 g/µm or greater, (II) the static coefficient of friction relative to aluminum foil being 0.40 or greater, and (III) the meltdown temperature being 180°C or greater.
The present invention pertains to a polyolefin microporous membrane having air resistance in terms of 16 μm of 100-220 sec/100 cc, puncture strength in terms of 16 μm of 550 gf or higher, and half-crystallization time (t1/2) during 117℃ isothermal crystallization of 10-35 min, a battery separator using the same, and a method for the production thereof. This polyolefin microporous membrane has excellent puncture strength and air resistance; curling is also suppressed, and the polyolefin microporous membrane has an excellent appearance with no winding deviation when made into a wound article.
C08J 9/28 - Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum
H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material
Imagining the possibility of further film-thinning and cost reduction in the future, this battery separator provides a battery separator in which a polyolefin laminated porous film for modified porous layer lamination and a modified porous layer are laminated, the battery separation having a very high peel strength between the polyolefin laminated porous film and the modified porous layer and being suitable for high speed processing in slitting steps and battery assembly steps. The present invention is a polyolefin laminated porous film obtained from at least two layers, wherein: projections obtained from polyolefin satisfy 5 µm ≤ W ≤ 50 µm (W is the size of the projection) and 0.5 µm ≤ H (H is the height of the projection) and are scattered irregularly on one surface at 3 projections/cm2 to 200 projections/cm2; the film has a meltdown temperature of at least 165°C and an air impermeability of not more than 300 sec/100 cc air; and the film thickness is not more than 20 µm.
Provided is a microporous polyolefin membrane which is excellent in terms of appearance and high-temperature shape retentivity and which can pass a safety evaluation test with high certainty. The microporous polyolefin membrane contains 5-20% by weight polypropylene having a weight-average molecular weight of 1,500,000-3,000,000, 5-20% by weight polyethylene having a weight-average molecular weight of 1,500,000-2,500,000, and 60-90% polyethylene having a weight-average molecular weight of 200,000-500,000 and has a single-layer structure.
C08J 9/26 - Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a solid phase from a macromolecular composition or article, e.g. leaching out
The present invention provides a separator for batteries that combines adhesiveness to electrodes and low heat shrinkability, which have conventionally been difficult to attain simultaneously, and that has excellent ion permeability, in order to further heighten the safety of lithium-ion secondary batteries on the supposition that the batteries come to be widely used in applications involving severe use environments, such as electric vehicles. The separator for batteries comprises a porous film constituted of a polyolefin resin and, superposed on at least one surface thereof, a modified porous layer comprising a fluororesin and inorganic particles, wherein the content of the particles is 40 vol% or higher but less than 70 vol% relative to the total amount of the fluororesin and the particles, and the fluororesin has a degree of crystallinity of 36% or higher but less than 70%.
The present invention relates to a secondary battery having an improved life span performance by comprising a high-voltage cathode active material and a separation film of which pores are not blocked even if used with the high-voltage cathode active material, and can have excellent battery life span since the blocking of the separation film pores and the generation of dendrites in a anode are prevented.
H01M 10/04 - Construction or manufacture in general
H01M 2/14 - Separators; Membranes; Diaphragms; Spacing elements
H01M 4/525 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
H01M 4/505 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
18.
METHOD FOR MANUFACTURING SEPARATOR, SEPARATOR MANUFACTURED THEREFROM, AND ELECTROCHEMICAL ELEMENT COMPRISING SAME
A method for manufacturing a separator according to the present invention comprises the steps of: preparing an aqueous slurry including inorganic particles, a binder polymer, and an aqueous material; and coating the aqueous slurry on at least one surface of a porous polymer substrate to form an organic-inorganic composite porous coating layer, wherein the capillary number of the aqueous slurry is in the range of 0.3 to 65.
Provided is a method for manufacturing a microporous plastic film having excellent quality of appearance while having characteristics such as strength, through use of a wet drawing method. This method for manufacturing a microporous plastic film comprises a step for kneading a diluting agent and a polymer in an extruder, discharging the polymer into which the diluting agent is kneaded from a die into a sheet shape, and drawing the sheet discharged from the die in a conveyance direction of the sheet through use of a plurality of rollers, the sheet being drawn in the conveyance direction, wherein the diluting agent is applied to the sheet and/or at least one of the plurality of rollers.
B29C 47/88 - Heating or cooling the stream of extruded material
C08J 9/26 - Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a solid phase from a macromolecular composition or article, e.g. leaching out
20.
POLYOLEFIN MICROPOROUS FILM, AND COATING BACKING MATERIAL PRODUCED USING POLYOLEFIN MICROPOROUS FILM
Provided is a microporous film which can be used suitably as a coating backing material that has been highly demanded in fields including separators for batteries, films for capacitors and filters, and which can be coated uniformly. A polyolefin microporous film characterized in that the relative value of an average value of peak pore diameters as determined in the TD direction relative to the standard deviation of an expected value of pore diameters as determined in the TD direction is less than 24%. The polyolefin microporous film has a narrow pore diameter distribution as determined in the TD direction and also has dense pore diameters. Therefore, the non-uniformity in coating with a coating material and the wrinkling of a coating can be reduced drastically in the polyolefin microporous film, and therefore the polyolefin microporous film can be used suitably as a coating backing material.
C08J 9/28 - Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum
In anticipation of the trend towards increasingly thinner and lower-cost separators for cells, the present invention provides a cell separator obtained by laminating a reformed porous layer and a laminated porous polyolefin film for reformed porous-layer lamination, in which the peel strength between the laminated porous polyolefin film and the reformed porous layer is extremely high, the cell separator being suitable for the high-speed processing involved in a slitting step and a cell assembly step,. The laminated porous polyolefin film comprises at least two layers, has a shutdown temperature of 128-135°C, and a rate of increase in air resistance of less than 1.5 sec/100 ccAir/°C at 105°C from 30°C at a thickness of 20 µm, and measures µm or less in film thickness.
B32B 5/32 - Layered products characterised by the non-homogeneity or physical structure of a layer characterised by the presence of two or more layers which comprise fibres, filaments, granules, or powder, or are foamed or specifically porous both layers being foamed or specifically porous
B32B 3/30 - Layered products essentially comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products essentially having particular features of form characterised by a layer with cavities or internal voids characterised by a layer formed with recesses or projections, e.g. grooved, ribbed
C08J 9/26 - Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a solid phase from a macromolecular composition or article, e.g. leaching out
22.
SEPARATOR FOR BATTERIES AND METHOD FOR PRODUCING SAME
[Problem] To provide: a multilayer porous membrane which has an extremely high peel strength between a polyolefin porous membrane and a modified porous layer and is suitable for high-speed processing; and a separator for batteries, which exhibits extremely excellent adhesion to an electrode. [Solution] A separator for batteries, which is characterized by comprising at least: a polyolefin porous membrane wherein projections formed of a polyolefin and satisfying 5 μm ≤ W ≤ 50 μm (W is the size of each projection) and 0.5 μm ≤ H (H is the height of each projection) are randomly scattered about on one surface at a density of from 3 projections/cm2 to 200 projections/cm2 (inclusive); and a modified porous layer which is laminated on the surface having the projection of the polyolefin porous membrane and contains a fluorine-based resin and inorganic particles. This separator for batteries is also characterized in that the content of the inorganic particles relative to the total amount of the fluorine-based resin and the inorganic particles in the modified porous layer is 40% by weight or more but less than 80% by weight.
H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material
B32B 5/24 - Layered products characterised by the non-homogeneity or physical structure of a layer characterised by the presence of two or more layers which comprise fibres, filaments, granules, or powder, or are foamed or specifically porous one layer being a fibrous or filamentary layer
This laminated porous film is obtained by laminating, with a modified porous layer (A), one surface of a polyolefin porous film, and laminating, with a modified porous layer (B), an opposite surface of the polyolefin porous film. The polyolefin porous film has a film thickness of not more than 25 µm, and has protrusions which comprise polyolefin, which satisfy 5 µm ≤ W ≤ 50 µm (W being the size of the protrusions) and 0.5 µm ≤ H (H being the height of the protrusion), and which are irregularly dispersed on both surfaces of the polyolefin porous film at a density in the range of 3/cm2 to 200/cm2 inclusive per surface. At least the modified porous layer (A) includes inorganic particles and a binder having a tensile strength of at least 5 N/mm2. The peel strength between the polyolefin porous film and the modified porous layers is extremely high, and thus the laminated porous film is suitable for high-speed processing.
B32B 5/32 - Layered products characterised by the non-homogeneity or physical structure of a layer characterised by the presence of two or more layers which comprise fibres, filaments, granules, or powder, or are foamed or specifically porous both layers being foamed or specifically porous
The purpose of the present invention is to provide: a polyolefin microporous film which has excellent puncture strength and air resistance, does not undergo wrinkling or misalignment upon being wound and therefore enables the production of a wound product having excellent appearance; the wound product; and a method for producing a polyolefin microporous film. A polyolefin microporous film characterized by having puncture strength of 400 gf or more when the film has a thickness of 16 μm and also having air resistance of 100 to 400 sec/100 cc when the film has a thickness of 16 μm, and also characterized in that the static friction coefficient of the film is 0.5 to 1.0 as measured by superposing the front surface and the back surface of the film on each other.
C08J 9/28 - Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum
C08L 23/02 - Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material
25.
POROUS FILM, POROUS-FILM ROLLER, AND METHOD FOR PRODUCING POROUS FILM
The purpose of the present invention is to provide a porous film which not only exhibits excellent mechanical strength and thermal properties, but is also unlikely to wrinkle as a result of changes over time, despite being thin, and is appropriate for use as a battery separator which contributes to production-property improvements. A porous film having a polyethylene-based resin as the principal component thereof, the porous film being characterized in that the thickness thereof is in the range of 1-10μm, the shrinkage thereof in the widthwise direction at 40°C over 24 hours is 0-0.8%, the piercing strength thereof is 100-500gf, the elasticity thereof in the widthwise direction is in the range of 700-2000 MPa, the elasticity thereof in the lengthwise direction is in the range of 500-1800 MPa, and the lengthwise-direction-elasticity/widthwise-direction-elasticity ratio is 0.3-1.0.
C08J 9/28 - Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum
26.
POLYOLEFIN POROUS FILM, SEPARATOR FOR BATTERIES WHICH IS MANUFACTURED USING SAID POROUS FILM, AND METHODS RESPECTIVELY FOR MANUFACTURING SAID POROUS FILM AND SAID SEPARATOR
A separator for batteries according to the present invention is provided on the assumption that the thicknesses of separators for batteries would be increasingly reduced and the costs for manufacturing the separators would be increasingly reduced. Thus, provided is a separator for batteries, which is manufactured by laminating a polyolefin porous film for modified porous layer lamination use onto a modified porous layer, has extremely high peel strength between the polyolefin porous film and the modified porous layer, and is suitable for a high-speed processing in a slitting process or a battery assembly process. A polyolefin porous film which has protrusions that are made from a polyolefin, satisfy the following formulae: 5 μm ≤ W ≤ 50 μm (wherein W represents the size of each of the protrusions) and 0.5 μm ≤ H (wherein H represents the height of each of the protrusions) and are scattered irregularly on both surfaces of the porous film at a density of 3 to 200 protrusions/cm2 inclusive per one surface, and which has a thickness of 25 μm or less.
C08J 9/26 - Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a solid phase from a macromolecular composition or article, e.g. leaching out
Provided is a separator for batteries, which is a laminated polyolefin microporous film wherein a modified porous layer containing a water-soluble resin or a water-dispersible resin and fine particles on at least one surface of a polyolefin microporous film, and which is characterized in that: the polyolefin microporous film contains a polyethylene resin; (a) the shutdown temperature (the temperature at which the air resistance reaches 1 × 105 sec/100 cc as measured while being heated at a heating rate of 5°C/min) is 135°C or less; (b) the air resistance change ratio (the gradient of the curve showing temperature dependence of the air resistance at the air resistance of 1 × 104 sec/100 cc) is 1 × 104 sec/100 cc/°C or more; (c) the shrinkage ratio in the transverse direction at 130°C (as determined by thermomechanical analysis at a heating ratio of 5°C/min under a load of 2 gf) is 20% or less; the polyolefin microporous film has a thickness of 16 μm or less; and the difference between the shutdown temperature of the polyolefin microporous film and the shutdown temperature of the laminated polyolefin microporous film is 4.0°C or less. Also provided is a method for producing this separator for batteries. This separator for batteries comprises a modified porous layer and a polyolefin microporous film, and exhibits excellent adhesion and excellent shutdown characteristics.
Provided is a microporous polyolefin membrane which has excellent oxidation resistance, electrolyte injection performance and shutdown characteristics, and which further has excellent permeability and strength balance. This microporous polyolefin membrane contains polypropylene and polyethylene. The electrolyte injection performance is 20 seconds or less, the shutdown temperature is 132°C or less, the air permeability when converting the membrane thickness to 20μm is 700s/100cm3 or less, the puncture strength when converting the membrane thickness to 20μm is 2,000mN or greater, and the polypropylene distribution is uniform in the in-plane direction.
C08J 9/26 - Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a solid phase from a macromolecular composition or article, e.g. leaching out
B32B 5/32 - Layered products characterised by the non-homogeneity or physical structure of a layer characterised by the presence of two or more layers which comprise fibres, filaments, granules, or powder, or are foamed or specifically porous both layers being foamed or specifically porous
Provided is a microporous polyolefin membrane which has excellent oxidation resistance and electrolyte injection performance and further has excellent permeability and strength balance. This multilayer, microporous polyolefin membrane has a first microporous layer containing polypropylene. The electrolyte injection performance is 20 seconds or less, at least one surface layer is a first microporous layer, and the PP distribution in the first microporous layer is uniform in the in-plane direction.
C08J 9/26 - Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a solid phase from a macromolecular composition or article, e.g. leaching out
H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material
30.
MULTILAYER, MICROPOROUS POLYOLEFIN MEMBRANE, AND PRODUCTION METHOD THEREOF
Provided is a microporous polyolefin membrane which has excellent oxidation resistance, electrolyte injection performance and shutdown characteristics, and which further has excellent permeability and strength balance. This multilayer, microporous polyolefin membrane is obtained by forming a gel-like sheet using a polyolefin resin that contains polypropylene, and by stretching said gel-like sheet in at least one direction and cleaning the same. The membrane has a first microporous layer containing polypropylene; at least one surface layer of the membrane is a first microporous layer, and the electrolyte injection performance is 20 seconds or less. The PP distribution in the first microporous layer is uniform in the in-plane direction, and the shutdown temperature is 132°C or less.
C08J 9/26 - Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a solid phase from a macromolecular composition or article, e.g. leaching out
H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material
31.
LAMINATED POROUS MEMBRANE, PROCESS FOR MANUFACTURING SAME AND SEPARATOR FOR BATTERY
A laminated porous membrane characterized by comprising, as the essentials, both a polyolefin porous membrane in which protrusions that are made of a polyolefin and satisfy the relationships 5μm≤W≤50μm (wherein W is the size of each protrusion) and 0.5μm≤H (wherein H is the height of each protrusion) are irregularly scattered on one surface thereof at a density of 3 to 200 protrusions /cm2, and a modifying porous layer which is laminated on the protrusions-bearing surface of the polyolefin porous membrane and which contains a binder having a tensile strength of 5N/mm2 or more and inorganic particles. Thus, a laminated porous membrane which exhibits an extremely high peel strength between the polyolefin porous membrane and the modifying porous layer and is suitable for high-speed fabrication and a laminated porous membrane which is to be used as a separator for a battery are provided.
B32B 5/32 - Layered products characterised by the non-homogeneity or physical structure of a layer characterised by the presence of two or more layers which comprise fibres, filaments, granules, or powder, or are foamed or specifically porous both layers being foamed or specifically porous
C08J 9/00 - Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
C08J 9/28 - Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum
H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material
32.
POROUS POLYOLEFIN FILM, BATTERY SEPARATOR OBTAINED USING SAME, AND PROCESSES FOR PRODUCING THESE
A porous polyolefin film in which protrusions constituted of the polyolefin that satisfy the relationships 5 μm≤W≤50 μm (W is the size of each protrusion) and 0.5 μm≤H (H is the height of each protrusion) are irregularly and scatteringly present on one surface in a population of 3-200 protrusions/cm2 and which has a film thickness of 20 μm or less. On the supposition that film thickness reduction and cost reduction proceed more and more in future, a battery separator which comprises the porous polyolefin film for modified-porous-layer superposition and a modified porous layer superposed thereon is provided, the battery separator having extremely high peel strength between the porous polyolefin film and the modified porous layer and being suitable for high-speed processing in a slitting step or a battery assembly step.
C08J 9/28 - Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum
B32B 5/32 - Layered products characterised by the non-homogeneity or physical structure of a layer characterised by the presence of two or more layers which comprise fibres, filaments, granules, or powder, or are foamed or specifically porous both layers being foamed or specifically porous
A separator for batteries, which is obtained by laminating a modified porous layer that contains a fluorine-based resin and inorganic particles or crosslinked polymer particles on one surface of a polyolefin microporous membrane having a thickness of 16 μm or less. This separator for batteries satisfies formula (1) and formula (2) described below, and the polyolefin microporous membrane is characterized in that (a) the shutdown temperature thereof is 135°C or less and (b) the air resistance change ratio thereof is 1 × 104 sec/100 cc/°C or more. A method for producing this separator for batteries. 0.01 ≤ absT(1200) ≤ 0.30 (1) absT(1200): the absorbance per a thickness of 10 μm of the polyolefin microporous membrane of the absorption having a peak at around 1,200 cm-1 as determined by infrared spectrometry (a transmission method) in cases where the modified porous layer is separated from the polyolefin microporous membrane 0.001 ≤ absR(1200) ≤ 0.030 (2) absR(1200): the absorbance at the maximum peak at around 1,200 cm-1 as determined by infrared spectrometry (a reflection method) of a surface of the polyolefin microporous membrane, said surface being on the reverse side of the modified porous layer. Consequently, the present invention provides: a separator for batteries, which has good adhesion to an electrode, excellent shutdown performance and excellent electrolyte solution permeability, and which is suitable for high-capacity batteries; and a method for producing this separator for batteries.
H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material
B32B 5/32 - Layered products characterised by the non-homogeneity or physical structure of a layer characterised by the presence of two or more layers which comprise fibres, filaments, granules, or powder, or are foamed or specifically porous both layers being foamed or specifically porous
Provided is a porous polyolefin film production method, whereby an unstretched sheet is biaxially stretched in the machine direction and the transverse direction at an initial stretching step and then restretched at a restretching step, said unstretched sheet being obtained by subjecting a polyolefin resin, the primary component of which is a polypropylene resin containing a β nucleating agent, to melt mixing, extrusion from a die, and cooling. The ratio (λm2/λm1) of the machine-direction draw rate (λm2) at the restretching step and the machine-direction draw rate (λm1) at the initial stretching step is 0.45 or less. Provided is a porous polyolefin film with which productivity, output characteristics, and safety are excellent when used as a separator for a storage device or the like.
A battery separator which comprises a polyolefin microporous film and a modifying porous layer laminated on at least one surface thereof, wherein the polyolefin microporous film comprises a polyethylene-based resin and exhibits (a) a shutdown temperature of 135ºC or lower, (b) an air permeation resistance change of 1×104 sec/100cc/ºC or more, and (c) a crosswise shrinkage factor at 130 ºC of 20% or less. Thus, a battery separator which exhibits high physical property stability until the initiation of shutdown, a high air permeation resistance change after the initiation of shutdown, excellent thermal shrinkage resistance in a temperature range from shutdown initiation temperature to shutdown temperature, a low shutdown temperature, and excellent adhesion to an electrode is provided.
A biaxially stretched microporous film characterized by being constituted of a strip polyethylene material which has a film width of 300 mm or more and, with respect to material-property distribution in the film-width direction, having a thickness unevenness set at a value less than 1.00 µm and an air-permeability unevenness set at 50 sec/100 mL or less. Thus, provided is a microporous polyethylene film that is excellent in terms of material-property evenness and flatness, which are required when the film having a large area is used as a separator film for lithium-ion batteries for motor vehicles or domestic use.
C08J 9/26 - Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a solid phase from a macromolecular composition or article, e.g. leaching out
C08J 9/00 - Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
37.
MULTI-LAYERED POROUS FILM, ELECTRICAL CELL SEPARATOR, AND ELECTRICAL CELL
A multi-layered porous film in which a porous layer (B) for which a filler (a) and binder resin (b) are essential components is provided to at least one side of a polyolefin porous film (A), the true specific gravity of the filler (a) being less than 2.0 g/cm3. Provided is a multi-layered porous film offering low heat shrinkage and excellent melt-down resistance properties without compromising the properties of insulation performance, ion permeability, light weight, and slip performance normally required for a separator. Also provided is an electrical cell or capacitor of high safety and high weight energy density in which the multi-layered porous film is used as a separator.
B32B 5/32 - Layered products characterised by the non-homogeneity or physical structure of a layer characterised by the presence of two or more layers which comprise fibres, filaments, granules, or powder, or are foamed or specifically porous both layers being foamed or specifically porous
C08J 9/28 - Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum
H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material
A battery separator in which a porous film (B) containing a fluorine-based resin and inorganic particles or crosslinking polymer particles is laminated on a porous film (A) comprising a polyolefin-based resin, wherein the content of the particles is between 80 and 97 weight% relative to porous film (B), the average particle size of the particles is equal to or greater than 1.5 times and is less than 50 times the average hole diameter of porous film (A), and specific formula (1) and specific formula (2) are fulfilled. The present invention provides a battery separator exhibiting excellent heat resistance and processability (electrolyte solution permeability, and low curling properties) and having an extremely low degree of increase of air permeation resistance caused by laminating a heat-resistant resin.
A multilayered microporous polyolefin film comprising first microporous layers that respectively form at least both surface layers and at least one second microporous layer that is arranged between the both surface layers, wherein the static friction coefficient as measured in the length direction (MD) of one of the surfaces of the multilayered microporous polyolefin film relative to the other of the surfaces is 1.1 or less and the hole tightness degree as calculated from an average pore diameter and a porosity both determined by a mercury pressure-fitting method in accordance with the equation shown below is 4 or more. Hole tightness degree = (P/A3)×104 In the equation, A and P respectively represent an average pore diameter (nm) and a porosity (%) both measured by a mercury pressure-fitting method. Provided are: a multilayered microporous polyolefin film which has such a property that, when two of the films are laminated, the sliding property between the films is good, and which has a dense pore structure; and a method for producing the multilayered microporous polyolefin film.
B32B 5/32 - Layered products characterised by the non-homogeneity or physical structure of a layer characterised by the presence of two or more layers which comprise fibres, filaments, granules, or powder, or are foamed or specifically porous both layers being foamed or specifically porous
H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material
A battery separator which is obtained by laminating a porous membrane (B) that contains a polyamide-imide resin and inorganic particles or crosslinked polymer particles on a porous membrane (A) that is formed of a polyolefin resin. The particles are contained in an amount of from 80% by weight to 97% by weight (inclusive) of the porous membrane (B), and have an average particle diameter of 1.5 times or more but less than 50 times the average pore diameter of the porous membrane (A). The battery separator satisfies specific formula (1) and specific formula (2). Provided is a battery separator which is characterized by: having excellent heat resistance and processability (electrolyte solution permeability and low curling properties); and having an extremely small increase in the air permeation resistance due to lamination of a heat-resistant resin layer.
A polyethylene microporous membrane which exhibits a Gurley air permeability of 1 to 1,000 sec/100mL/25μm and in which the total length of widths of waves in the widthwise direction of the microporous membrane is at most one-third of the overall width of the microporous membrane, and a process for manufacturing the same. The present invention provides a polyethylene microporous membrane having excellent flatness without impairing the other important physical properties such as permeability.
Provided is a battery which has low curling properties and which has both excellent adhesion of the heat-resistant resin layer and a low degree of increase in air permeation resistance. The present invention relates to a battery separator in which a porous film (B) comprising a heat-resistant resin and inorganic particles or crosslinked polymer particles is laminated on a porous film (A) comprising a polypropylene resin, wherein the porous film (A) satisfies expression (a) t(A) < 10μm (t(A) is the thickness of the porous film (A)), expression (b) 0.01μm ≦ R(A) ≦ 1.0mμ (R(A) is the average pore diameter of the porous film (A)), and expression (c) 30% ≦ V(A) ≦ 70% (V(A) is the void ratio of the porous film (A)), and the entire electric separator fulfills expression (d) t(T) ≦ 13μm (t(T) is the thickness of the entire battery separator), expression (e) F(A/B) ≦ 1.0 N/25mm (F(A/B) is the peeling strength at the interface between the porous film (A) and the porous film (B)), and expression (f) 20 ≦ Y-X ≦ 100 (X is the air permeation resistance (sec/100ccAir) of the porous film (A) and Y is the air permeation resistance (sec/100ccAir) of the entire battery separator).
Provided is a battery which has low curling properties and which has both excellent adhesion of the heat-resistant resin layer and a low degree of increase in air permeation resistance. The present invention relates to a battery separator in which a porous film (B) comprising a heat-resistant resin and inorganic particles or crosslinked polymer particles is laminated on a porous film (A) comprising a polyethylene resin, wherein the porous film (A) satisfies expression (a) t(A) < 10μm (t(A) is the thickness of the porous film (A)), expression (b) 0.01μm ≦ R(A) ≦ 1.0mμ (R(A) is the average pore diameter of the porous film (A)), and expression (c) 30% ≦ V(A) ≦ 70% (V(A) is the void ratio of the porous film (A)), and the entire electric separator fulfills expression (d) t(T) ≦ 13μm (t(T) is the thickness of the entire battery separator), expression (e) F(A/B) ≦ 1.0 N/25mm (F(A/B) is the peeling strength at the interface between the porous film (A) and the porous film (B)), and expression (f) 20 ≦ Y-X ≦ 100 (X is the air permeation resistance (sec/100ccAir) of the porous film (A) and Y is the air permeation resistance (sec/100ccAir) of the entire battery separator).
H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material
B32B 5/32 - Layered products characterised by the non-homogeneity or physical structure of a layer characterised by the presence of two or more layers which comprise fibres, filaments, granules, or powder, or are foamed or specifically porous both layers being foamed or specifically porous
C08J 9/28 - Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum
C08K 3/00 - Use of inorganic substances as compounding ingredients
C08L 79/08 - Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
44.
POLYOLEFIN MICROPOROUS FILM AND METHOD FOR PRODUCING SAME
A polyolefin microporous film, which is obtained by forming a gel-like molded product using a polyolefin resin that contains a polypropylene, stretching the gel-like molded product in at least one direction, and cleaning the stretched product, and which is characterized in that the electrolyte solution pourability is 20 seconds or less and the polypropylene distribution is uniform in at least one plane that is perpendicular to the thickness direction; and a method for producing the polyolefin microporous film. Provided is a polyolefin microporous film which has excellent oxidation resistance, mechanical characteristics and permeability.
C08J 9/28 - Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum
H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material
45.
POLYOLEFIN MICROPOROUS FILM, POLYOLEFIN MICROPOROUS FILM ROLL, METHOD FOR PRODUCING POLYOLEFIN MICROPOROUS FILM OR POLYOLEFIN MICROPOROUS FILM ROLL, AND SEPARATOR FOR BATTERIES USING POLYOLEFIN MICROPOROUS FILM OR POLYOLEFIN MICROPOROUS FILM ROLL
The purpose of the present invention is to provide: a polyolefin microporous film having excellent productivity, which is capable of maintaining good film flatness even in the state of a wide and long roll; a polyolefin microporous film roll; a method for producing the polyolefin microporous film or the polyolefin microporous film roll; and a separator for batteries, which uses the polyolefin microporous film or the polyolefin microporous film roll. The present invention provides: a polyolefin microporous film which has a thickness of from 1 μm to 50 μm (inclusive), an air permeation resistance of from 50 seconds/100 mL to 500 seconds/100 mL (inclusive), and a shrinkage in the width direction of from -0.3% to 0.3% (inclusive) and a shrinkage in the longitudinal direction of from 0.0% to 1.5% (inclusive) at 40˚C in 48 hours; a film roll which is obtained by winding up the polyolefin microporous film; a method for producing the polyolefin microporous film or the polyolefin microporous film roll; and a separator for batteries, which uses the polyolefin microporous film or the polyolefin microporous film roll.
C08J 9/26 - Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a solid phase from a macromolecular composition or article, e.g. leaching out
B29C 55/02 - Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
C08J 9/00 - Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material
B29K 23/00 - Use of polyalkenes as moulding material
B29K 105/04 - Condition, form or state of moulded material cellular or porous
A manufacturing device for a microporous plastic film roll (12) comprises a conveyance roller (2) and a near roller (3) or a touch roller (6). A microporous plastic film (1) is conveyed by the conveyance roller (2), and wound on a core (5) via the near roller (3) or the touch roller (6). The microporous plastic film roll (12) on the core (5) is close to the near roller (3) or is in contact with touch roller (6). The surfaces of the near roller (3) and the touch roller (6) each have a Vickers hardness of 100-2000 inclusive. A nip roller is not used for the conveyance of the microporous plastic film (1). Therefore, the possibility that foreign matter such as metal powder sticking in the surfaces of the rollers (2, 3, 6) causes pinholes in the microporous plastic film (1) is low. The microporous plastic film (1) is suitable as a separator for a secondary battery.
A microporous membrane roll body (33) comprises cores (1, 11, 21, 31) formed in whole or in part from conductive members (12, 13), and microporous membranes (34, S) which are rolled around the cores (1, 11, 21, 31). A first face (100) and a second face (200) of the microporous membranes (34, S) are respectively equivalently charged with antipolar charges (102, 201). A method of manufacturing the microporous membrane roll body (33) includes diselectrifying the microporous membranes (34, S) with a diselectrifier (35), and winding the microporous membranes (34, S) around the cores (1, 11, 21, 31) formed in whole or in part from the conductive members (12, 13). When the microporous membranes (34, S) are unwound from the cores (1, 11, 21, 31), the microporous membranes (34, S) are prevented from being drawn toward either the microporous membrane roll body (33) or peripheral devices by static electricity. The microporous membranes (34, S) are useful as a separator in either a fuel cell or a secondary battery.
A porous membrane (A') which is obtained by disposing a porous membrane (A) to be processed within a coating apparatus and performing a coating process, while having a specific starting material present in a gas state in the apparatus and additionally having an additive gas coexistent therein, so that a coating film that contains the constituent elements of the starting material and the additive gas is formed on at least one surface of the porous membrane (A). Provided are: a porous membrane which has excellent thermal shrinkage resistance, excellent shutdown characteristics, excellent melt down resistance, electrolyte solution wettability and electrochemical stability without lowering ion permeability, mechanical characteristics and the like required for a battery separator; and a battery separator which uses the porous membrane.
This method of manufacturing a microporous polyethylene film involves mixing polyethylene and a film-forming solvent, stretching the sheet formed by extrusion from a die, and removing said film-forming solvent. Said stretching involves a step for stretching in the longitudinal direction with a stretch ratio of 1.1-2.0, and a step for stretching in the longitudinal direction and the width direction simultaneously with an surface area magnification ratio of 4-50. Provided is a method of manufacturing a microporous polyethylene film which, when made into a battery, has uniform properties in the winding direction and excellent balance between longitudinal stiffness, air permeability and thermal shrinkage.
C08J 9/28 - Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum
The present invention is a microporous membrane which contains (a) a polymethyl pentene, (b) a polyethylene and (c) a polypropylene and which has a meltdown temperature of 180˚C or more, a TD thermal shrinkage at 170˚C of 35% or less, and a thickness variation rate per membrane thickness of 10% or less. The purpose of the present invention is to provide a microporous membrane that has high meltdown temperature, low shutdown temperature and resistance to thermal shrinkage at high temperatures, which have not been achieved by conventional technology.
C08J 9/28 - Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum
H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material
51.
MULTILAYER MICROPOROUS FILM, PROCESS FOR PRODUCTION OF THE FILM, AND USE OF THE FILM
The present invention relates to a polymer film in a broad sense, and more specifically a polymer film, a process for producing the film and use of the film as a battery separator film. In one embodiment, the present invention relates to a liquid-permeable multilayer microporous film involving a thin layer. According to the present invention, a liquid-permeable multilayer microporous film having excellent physical properties including permeability can be produced without causing delamination in the film.
B32B 5/26 - Layered products characterised by the non-homogeneity or physical structure of a layer characterised by the presence of two or more layers which comprise fibres, filaments, granules, or powder, or are foamed or specifically porous one layer being a fibrous or filamentary layer another layer also being fibrous or filamentary
The present invention relates to a microporous film, which includes low melting point polypropylene that is a polypropylene homopolymer or copolymer having an MFR of at least 2.0×102, Tm in the range 85.0°C to 130°C, and Te-Tm no more than 10°C, a manufacturing method for the film, and a use for the film as a battery separator film in a lithium ion secondary battery. The present invention can obtain a microporous film having a superior balance of gas permeability, shut-down temperature, and puncture strength.
C08J 9/00 - Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
B29C 55/02 - Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
B32B 5/18 - Layered products characterised by the non-homogeneity or physical structure of a layer characterised by features of a layer containing foamed or specifically porous material
H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material
53.
COMPOSITE POROUS FILM AND METHOD FOR MANUFACTURING SAME
Provided is a battery separator which has extremely little variation in air permeation resistance and does not exhibit large-scale elevation in air permeation resistance, even in the case of a battery separator having comparatively large width such as is required when the size of the battery is increased. A composite porous film which is employed as a battery separator, wherein the composite porous film is formed by laminating a porous film (B) containing heat-resistant resin onto a porous film (A) comprising polyolefin resin, the surface of the porous film (B) on the side that does not face the porous film (A) has a three-dimensional mesh structure having nodes, and the separation interface on the porous film (B) side when the porous film (A) and the porous film (B) are separated is of a film form having at least 100 pores of pore diameter 50 to 500 nm per 10 μm².
B32B 5/32 - Layered products characterised by the non-homogeneity or physical structure of a layer characterised by the presence of two or more layers which comprise fibres, filaments, granules, or powder, or are foamed or specifically porous both layers being foamed or specifically porous
C08J 9/28 - Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum
H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material
54.
COMPOSITE POROUS MEMBRANE AND METHOD FOR PRODUCING SAME
Provided is a composite porous membrane that achieves both superior adhesion of a heat-resistant resin layer and a low amount of air permeation resistance increase, even if the composite porous membrane, such as a battery separator, is made much thinner in the future. In the composite porous membrane used as a battery separator, a porous membrane (B) containing a polyamide resin containing an isophorone structure at an amine component is layered on a porous membrane (A) comprising a polyolefin resin. In that wherein porous membrane A falls within a particular range of thicknesses, average pore sizes, and porosities and the composite porous membrane as a whole falls within a particular range of thicknesses, the composite porous membrane is characterized by further falling within a particular range of delamination strengths at the interface between porous membrane A and porous membrane B, and a particular range of differences between the air permeation resistance of porous membrane A and the air permeation resistance of the composite porous membrane as a whole.
C08J 9/28 - Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum
B32B 5/18 - Layered products characterised by the non-homogeneity or physical structure of a layer characterised by features of a layer containing foamed or specifically porous material
Provided is a composite porous film having both adhesiveness in a resin layer with superior heat resistance and a low degree of increase in air resistance. In this composite porous film, a porous film (B) containing a heat resistant resin is laminated on the surface of a polypropylene resin in the outermost layer of a porous film (A) formed from at least one layer and having at least one outermost layer formed from a polypropylene resin. The composite porous film is characterized by satisfying a specific range of peel strength at the interface between the porous film (A) and the porous film (B) as well as a specific range for the difference between the air resistance of the composite porous film as a whole and the air resistance of the porous film (A) when the porous film (A) satisfies a specific range of pore size and porosity.
H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material
B32B 5/18 - Layered products characterised by the non-homogeneity or physical structure of a layer characterised by features of a layer containing foamed or specifically porous material
C08J 9/28 - Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum
56.
MICROPOROUS FILM, PROCESS FOR PRODUCTION OF THE FILM, AND USE OF THE FILM
The present invention relates to a microporous polymer film which is suitable for use as a battery separator film. The film comprises polyethylene, polypropylene and polymethyl pentene. The present invention also relates to a process for producing the film, a battery equipped with the film as a battery separator, a process for producing the battery, and use of the battery.
C08J 9/28 - Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum
B29C 55/02 - Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
H01M 2/16 - Separators; Membranes; Diaphragms; Spacing elements characterised by the material
57.
POLYOLEFIN MICROPOROUS MEMBRANE, SEPARATOR FOR BATTERY, AND BATTERY
A polyolefin microporous membrane which, in the pore size distribution curve determined by a mercury intrusion method, exhibits an S2/S1 ratio (S2/S1 × 100) of 25% or higher and an S3/S1 ratio (S3/S1 × 100) of 5% or lower [wherein S1 represents the volume of pores of 10 to 1,000nm in radius; S2 represents the volume of pores of 100 to 1,000nm in radius; and S3 represents the volume of pores of 500 to 1,000nm in radius]. Thus, provided are: a polyolefin microporous membrane which is thin and which has a high porosity and excellent permeability and mechanical strengths; a separator for a battery, using the microporous membrane; and a battery using the separator.
C08J 9/28 - Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum
C08K 3/00 - Use of inorganic substances as compounding ingredients
The invention relates to microporous membranes having high meltdown temperature and useful electrolyte affinity. The invention also relates to the production of these membranes and the use of these membranes as battery separator film.
C08J 9/28 - Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum
The invention relates to microporous membranes having a thickness 19.0 micrometer or less, the membranes having a relatively high porosity, air permeability and puncture strength. Such membranes can be produced by extrusion and are suitable for use as battery separator film.
patents
