The present invention is directed to a novel co-extruded multilayer structure that possess a draw down ratio superior than the critical draw-down ratio of each one of the polymeric layers, extruded individually. The present invention is also directed to a method for obtaining the co-extruded multilayer structure. The co-extruded multilayer structure obtainable by the method described herein allows preparing films, filaments or spun-melt non-wovens of low weight at high speed using conventional extrusion equipments. The co-extruded multilayer structure is especially suitable as diaper back-sheets or flexible packaging coatings.
B32B 27/08 - Layered products essentially comprising synthetic resin as the main or only constituent of a layer next to another layer of a specific substance of synthetic resin of a different kind
B29C 48/00 - Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired formApparatus therefor
B29C 48/08 - Flat, e.g. panels flexible, e.g. films
B29C 48/21 - Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
B29C 48/22 - Articles comprising two or more components, e.g. co-extruded layers the components being layers with means connecting the layers, e.g. tie layers or undercuts
B32B 7/12 - Interconnection of layers using interposed adhesives or interposed materials with bonding properties
B32B 37/15 - Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
2.
CO-EXTRUDED MULTILAYER STRUCTURE AND METHOD FOR OBTAINING THEREOF
The present invention is directed to a novel co-extruded multilayer structure that possess a draw down ratio superior than the critical draw-down ratio of each one of the polymeric layers, extruded individually. The present invention is also directed to a method for obtaining the coextruded multilayer structure. The co-extruded multilayer structure obtainable by the method described herein allows preparing films, filaments or spun-melt non-wovens of low weight at high speed using conventional extrusion equipments. The co-extruded multilayer structure is especially suitable as diaper back-sheets or flexible packaging coatings.
A method for producing a non-breathable micro-porous thermoplastic polymer film for outer covering of diapers and sanitary towels includes a dispersion step by mixture of mineral particles surface-covered with a hydrophobic layer of fatty acid, a base polymer and a co-polymer adhesive, wherein the co-polymer adhesive is selected to comprise the base polymer; and film forming step in a film extrusion line having a flat film extruder provided with an extrusion nozzle, wherein the mixture is fed to the flat film extruder forming the film, and hot stretching the film between the extrusion nozzle and the solidification of the formed film, thereby obtaining the non-breathable micro-porous film with pores sizing from 0.5 to 5 μm without communication between the pores. The process requires less raw materials with a further reduction of film thickness, while giving a matt appearance to the film, thus making the usual micro-embossing step of the extrusion line unnecessary.
B05D 1/26 - Processes for applying liquids or other fluent materials performed by applying the liquid or other fluent material from an outlet device in contact with, or almost in contact with, the surface
B29B 7/48 - MixingKneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws
C08K 9/04 - Ingredients treated with organic substances
A61L 15/18 - Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing inorganic materials
A61L 15/20 - Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing organic materials
A61L 15/22 - Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing macromolecular materials
A61L 15/24 - Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bondsDerivatives thereof
A61L 15/42 - Use of materials characterised by their function or physical properties
B32B 27/08 - Layered products essentially comprising synthetic resin as the main or only constituent of a layer next to another layer of a specific substance of synthetic resin of a different kind
B32B 27/20 - Layered products essentially comprising synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
B29C 47/00 - Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor (extrusion blow-moulding B29C 49/04)
C09J 151/06 - Adhesives based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bondsAdhesives based on derivatives of such polymers grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
METHOD FOR PRODUCING A LAMINAR PRODUCT PARTICULARLY SUITABLE FOR MANUFACTURING EXTERNAL COVERS OF SANITARY TOWELS AND NAPPIES, AND PRODUCT PRODUCED USING THIS METHOD
The invention relates to: a method for producing a laminar product suitable for manufacturing external covers of sanitary towels and nappies, formed by a polymeric coating deposited over the surface of a non-woven fabric substrate; and the laminar product produced using said method. The method comprises the following steps: producing adhesive polymeric mixtures; supplying the mixtures in a melted state to a screen-type applicator; coating the substrate with the adhesive polymeric mixtures; and winding the produced laminar product. The produced product comprises a polymeric coating joined to the non-woven fabric substrate, wherein the polymeric coating consists of an adhesive polymeric layer having a reduced thickness of between 1 and 10 micra, said product being suitable for medical and personal hygiene applications.
B32B 7/12 - Interconnection of layers using interposed adhesives or interposed materials with bonding properties
A61F 13/42 - Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the bodySupporting or fastening means thereforTampon applicators with wetness indicator or alarm
B32B 5/00 - Layered products characterised by the non-homogeneity or physical structure of a layer
B32B 37/00 - Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
5.
Composition and procedure for obtaining a film of micro porous thermoplastic polymer that is especially suited to the production of personal hygiene articles such as diapers and sanitary towels
The present invention consists in a method and a composition for obtaining films of a thermoplastic polymer, preferably polyethylene, that are non-breathable and heavily charged with treated mineral particles in order to leave hollow spaces in the structure thereof, resulting in a significant reduction in density.
Owing to the fact that said films exhibit improved stability to the stresses they undergo during processing in diaper-production machines, and because, furthermore, they offer an important saving in terms of costs owing to the high mineral-filler content thereof and the low density thereof, they are especially suited to use as an outer covering for disposable diapers and sanitary towels.
B32B 27/20 - Layered products essentially comprising synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
A61L 15/18 - Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing inorganic materials
A61L 15/20 - Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing organic materials
A61L 15/22 - Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons containing macromolecular materials
A61L 15/42 - Use of materials characterised by their function or physical properties
B29C 47/00 - Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor (extrusion blow-moulding B29C 49/04)
B32B 7/12 - Interconnection of layers using interposed adhesives or interposed materials with bonding properties
B32B 27/08 - Layered products essentially comprising synthetic resin as the main or only constituent of a layer next to another layer of a specific substance of synthetic resin of a different kind
B29K 23/00 - Use of polyalkenes as moulding material
6.
COMPOSITION AND METHOD FOR OBTAINING A FILM OF MICROPOROUS THERMOPLASTIC POLYMER THAT IS ESPECIALLY SUITED TO THE PRODUCTION OF PERSONAL HYGIENE ARTICLES SUCH AS DIAPERS AND SANITARY DRESSINGS
The present invention consists in a method and a composition for obtaining films of a thermoplastic polymer, preferably polyethylene, that are non-breathable and heavily charged with treated mineral particles in order to leave hollow spaces in the structure thereof, resulting in a significant reduction in density. Owing to the fact that said films exhibit improved stability to the stresses they undergo during processing in diaper-production machines, and because, furthermore, they offer an important saving in terms of costs owing to the high mineral-filler content thereof and the low density thereof, they are especially suited to use as an outer covering for disposable diapers and sanitary dressings.
patents
