Abstract

The invention relates to a method for degassing elastomer-containing media, such as elastomer solutions and dispersions in particular, and degassing devices (1) for carrying out said method.

IPC Classes  ?

• B29C 47/08 - Component parts, details or accessories; Auxiliary operations
• B29C 47/60 - Screws
• B29C 47/40 - using at least two intermeshing screws
• B29C 47/76 - Venting or degassing means
• B29B 7/48 - Mixing; Kneading 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
• B29B 7/74 - Mixing; Kneading using other mixers or combinations of dissimilar mixers
• B29B 7/84 - Venting or degassing

Abstract

The present invention relates to specific water and solvent-free nitrile rubbers having specific functional groups and/or end groups, a process for the production thereof and the use thereof. This process involves removing volatile compounds from a fluid (F) containing (1) at least one nitrile rubber and (2) at least one volatile compound, wherein the process comprises at least the steps of a.) treating the fluid (F) in at least one conversation unit, b.) retreating the concentrated fluid from step a.) in at least one retreating unit and c.) feeding the retreated concentrated fluid from step b.) into at least one retreating unit.

IPC Classes  ?

• C08L 9/02 - Copolymers with acrylonitrile
• C08C 2/00 - Treatment of rubber solutions
• C08C 1/12 - Concentrating by evaporation
• C08C 2/02 - Purification

Abstract

The present invention relates to curing of polymers, particularly to self curing of polymers. The present invention provides a process for curing of copolymers of isoolefins and olefinic monomers. The process includes the step of reacting the copolymer with an azidation reagent to form an azidated copolymer and then heating the azidated copolymer at a suitable temperature to cure the polymer.

IPC Classes  ?

• C08J 3/24 - Crosslinking, e.g. vulcanising, of macromolecules
• C08K 3/28 - Nitrogen-containing compounds
• C08K 5/5445 - Silicon-containing compounds containing nitrogen containing at least one Si—N bond
• C08L 23/26 - Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment

Abstract

The present invention relates to functionalized copolymers of isoolefins and olefinic monomers, particularly to azidated copolymers. The present invention also relates to methods of preparing such azidated copolymers. The functionalized copolymers are used in various technology areas such as surface modification, adhesion, drug delivery, compatibilization of polymer blends or motor oil and fuel additives, and in providing clean cured products without contaminant leaching and/or side products.

IPC Classes  ?

• C08F 8/30 - Introducing nitrogen atoms or nitrogen-containing groups
• C08F 210/12 - Isobutene with conjugated diolefins, e.g. butyl rubber
• C08F 212/12 - Hydrocarbons containing a branched unsaturated aliphatic radical or an alkyl radical attached to the ring
• C08F 236/08 - Isoprene
• C08F 236/10 - Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated with vinyl aromatic monomers

Abstract

The invention relates to an energy efficient, environmentally favourable process for the preparation of brominated butyl rubbers, that uses a bromination agent and a oxidizing agent in order to enhance the utilization of bromine contained in the bromination agent. In a preferred embodiment a common medium for both solution polymerization and subsequent bromination of the rubber is employed.

IPC Classes  ?

• C08F 8/22 - Halogenation by reaction with free halogens
• C08C 19/14 - Incorporating halogen atoms into the molecule by reaction with halogens

Abstract

The present invention relates to a process for the production of halogenated butyl rubber and an apparatus for the production of rubber cement for use in the production of halogenated butyl rubber. The process and apparatus permit direct mixing of aqueous rubber slurry with a non-halogenated organic solvent to make a rubber cement solution. The water layer is then separated from the partially dissolved rubber cement and the cement phase is sent for halogenation. The apparatus is an enclosed vessel comprised of at least one dissolving zone and at least one separator zone. The process and apparatus advantageously employ recycle of rubber cement in order to disrupt an interface layer that forms between the water and rubber cement, to thereby improve continuously operation of the process.

IPC Classes  ?

• C08C 19/12 - Incorporating halogen atoms into the molecule
• C08L 23/28 - Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment by reaction with halogens or halogen-containing compounds

Abstract

The present invention relates to a reactor (10) and a method for continuous polymerization, the reactor (10) having a substantially tubular reactor housing (16). The reactor housing (16) has a drive (38) which runs along the geometric central axis (12) in the flow direction (22) and is configured as a central shaft. A rotatably arranged scraper or wiper (36) is provided within the reactor housing (16), the scraper or wiper (36) having at least one scraper or wiper blade (42) to run along an inner side (44) of the reactor housing (16). The rotational movement of the scraper or wiper (36) results in radial mixing of a flow within the reactor housing (16), which flow dominates gravity effects and, as a result of shaping of the scrapers or wipers, optionally makes possible plug flow, a loop flow or backflow within the reactor (10) or also via an additional external pumped circulation system (23). This allows the reaction conditions in the axial direction of the reactor housing (16) to be predicted and suitable reaction conditions to be set and controlled individually along the reactor housing, such that a desired molecular weight distribution can be set in particular.

IPC Classes  ?

• B01J 19/18 - Stationary reactors having moving elements inside
• B01J 19/20 - Stationary reactors having moving elements inside in the form of helices, e.g. screw reactors
• C08F 2/01 - Processes of polymerisation characterised by special features of the polymerisation apparatus used

Abstract

The present invention relates to water and solvent -free halogenated butyl rubber products as a process for the production thereof. The process comprises at least the steps of: a.) treating a fluid containing at least one halogenated butyl rubber and at least one volatile compound in at least one concentrator unit, b.) reheating the concentrated fluid and c.) feeding the reheated concentrated fluid into at least one extruder.

IPC Classes  ?

• C08F 6/00 - Post-polymerisation treatments
• C08L 23/28 - Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment by reaction with halogens or halogen-containing compounds

Abstract

The present invention relates to specific water and solvent- free nitrile rubbers having specific functional groups and/or end groups, a process for the production thereof and the use thereof. This process involves removing volatile compounds from a fluid (F) containing (1) at least one nitrile rubber and (2) at least one volatile compound, wherein the process comprises at least the steps of a.) treating the fluid (F) in at least one conversation unit, b.) retreating the concentrated fluid from step a.) in at least one retreating unit and c.) feeding the retreated concentrated fluid from step b.) into at least one retreating unit.

IPC Classes  ?

• C08C 1/12 - Concentrating by evaporation
• C08C 2/00 - Treatment of rubber solutions
• C08F 6/10 - Removal of volatile materials, e.g. monomers, solvents

Abstract

The present invention relates to a process for the production of water and solvent -free hydrogenated nitrile rubber polymers, to the hydrogenated nitrile rubbers and the use thereof. The hydrogenated nitrile rubbers comprise repeating units derived from at least one conjugated diene, at least one alpha, beta - unsaturated nitrile and optionally one or more copolymerizable monomers and having a viscosity of at maximum 20000 Pa*s (measured at 100 degrees Celsius and at a shear rate of 1/s), preferably at maximum 10000 Pa*s, more preferably at maximum 5000 Pa*s and most preferably at maximum 1000 Pa*s.

IPC Classes  ?

• C08C 1/12 - Concentrating by evaporation
• C08C 2/00 - Treatment of rubber solutions
• C08F 6/10 - Removal of volatile materials, e.g. monomers, solvents
• C08F 8/04 - Reduction, e.g. hydrogenation
• C08F 236/12 - Copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds the radical having only two carbon-to-carbon double bonds conjugated with nitriles

Abstract

The invention relates to an energy efficient, environmentally favourable process for preparing water and solvent-free rubber ionomers and/or polymer nanocomposites comprising said rubber ionomers.

IPC Classes  ?

• C08C 19/12 - Incorporating halogen atoms into the molecule
• C08F 6/10 - Removal of volatile materials, e.g. monomers, solvents
• C08F 8/20 - Halogenation
• C08L 15/02 - Rubber derivatives containing halogen
• C08L 23/28 - Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment by reaction with halogens or halogen-containing compounds

Abstract

The present invention relates to water and solvent-free polymers, in particular water and solvent- free synthetic rubber products like non-halogenated and halogenated butyl rubber products as well as a process for the production thereof. The invention further relates to a device suitable to accomplish said process.

IPC Classes  ?

• B29C 47/50 - using at least two screws, one after the other, e.g. multi-stage plasticisers
• B29C 47/56 - using more than one extruder to feed one die
• C08C 2/00 - Treatment of rubber solutions
• C08F 6/00 - Post-polymerisation treatments
• C08L 23/28 - Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers modified by chemical after-treatment by reaction with halogens or halogen-containing compounds

Abstract

The invention relates to an energy efficient, environmentally favourable process for the preparation of butyl ionomers that uses a common medium for both solution polymerization and subsequent bromination of butyl rubber. More particularly, the invention relates to a process that employs a common aliphatic medium for both solution polymerization and bromination of butyl rubber in the presence of a brominating agent and optionally for subsequent reaction with at least one nitrogen and/or phosphorus based nucleophile.

IPC Classes  ?

• C08F 8/32 - Introducing nitrogen atoms or nitrogen-containing groups by reaction with amines
• C08C 19/32 - Addition of a reagent which reacts with a hetero atom or a group containing hetero atoms of the macromolecule reacting with halogens or halogen-containing groups
• C08F 210/12 - Isobutene with conjugated diolefins, e.g. butyl rubber
• C08F 8/40 - Introducing phosphorus atoms or phosphorus-containing groups
• C08C 19/22 - Incorporating nitrogen atoms into the molecule
• C08C 19/24 - Incorporating phosphorus atoms into the molecule
• C08F 2/06 - Organic solvent
• C08F 8/22 - Halogenation by reaction with free halogens
• C08F 8/44 - Preparation of metal salts or ammonium salts

Abstract

The invention relates to a processes for preparing nanocomposites comprising rubber ionomers which were prepared by an energy efficient, environmentally favourable process that uses a common medium for solution polymerization, bromination of rubber and optionally subsequent polymer nanocomposite formation. Polymer nanocomposites according to the present invention exhibit high oxygen impermeability.

IPC Classes  ?

• C08F 8/22 - Halogenation by reaction with free halogens
• C08F 210/12 - Isobutene with conjugated diolefins, e.g. butyl rubber
• C08J 5/00 - Manufacture of articles or shaped materials containing macromolecular substances
• B60C 1/00 - Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
• C08L 23/22 - Copolymers of isobutene; Butyl rubber

Abstract

The invention relates to an energy efficient, environmentally favourable process for the preparation of halogenated rubbers, in particular chloro- and bromobutyl rubber, that uses a common aliphatic medium of specific composition for both solution polymerization and subsequent halogenation of the rubber. More particularly, the invention relates to a process that employs a common aliphatic medium for both solution polymerization and halogenation of rubber with intermediate removal of un-reacted monomers.

IPC Classes  ?

• B60C 1/00 - Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
• C08F 8/22 - Halogenation by reaction with free halogens
• C08F 210/12 - Isobutene with conjugated diolefins, e.g. butyl rubber

Abstract

The invention relates to an energy efficient, environmentally favourable process for the preparation of brominated rubbers, in particular bromobutyl rubber, that uses a common medium for both solution polymerization and subsequent bromination of the rubber and which further exhibits an enhanced bromine usage due to the use of a oxidizing agent. More particularly, the invention relates to a process that employs a common aliphatic medium for both solution polymerization and bromination of rubber in the presence of a brominating agent and an oxidizing agent with intermediate removal of un-reacted monomers.

IPC Classes  ?

• C08F 2/06 - Organic solvent
• C08F 8/22 - Halogenation by reaction with free halogens
• C08F 210/12 - Isobutene with conjugated diolefins, e.g. butyl rubber
• C08C 19/14 - Incorporating halogen atoms into the molecule by reaction with halogens
• C08F 6/10 - Removal of volatile materials, e.g. monomers, solvents

Abstract

The present invention relates to a reactor (10) and a process for continuous polymerization, wherein the reactor (10) has an essentially tubular reactor housing (16). The reactor housing (16) has a drive (38) which is configured as a central shaft and runs along the geometric central axis (12) in the flow direction (22). Within the reactor housing (16), a rotatable scraper or wiper (36) is provided, the scraper (36) having at least one scraper blade (42) for running along an inner face (44) of the reactor housing (16). Preferably, scrapers/wipers which are fastened to the housing wall and scrape/wipe the optionally temperature-controlled drive shaft aid the mixing action. The rotary motion of the scraper (36) achieves a radial mixing of a stream within the reactor housing (16) that suppresses gravity effects and the shape of the scrapers/wipers facilitates either a plug flow or a backflow within the reactor (10). This allows the reaction conditions in the axial direction of the reactor housing (10) to be predicted and individually suitable reaction conditions to be set and monitored along the reactor housing, so that, in particular, a desired molecular weight distribution can be set.

IPC Classes  ?

• B01J 19/20 - Stationary reactors having moving elements inside in the form of helices, e.g. screw reactors

Abstract

The present invention relates to a reactor (10) and a method for continuous polymerization, wherein the reactor (10) comprises a substantially tube-shaped reactor housing (16). The reactor housing (16) comprises a drive (38) running along the geometric centerline (12) in the flow direction (22), the drive being implemented as a center shaft. A rotationally disposed scraper or wiper (36) is provided within the reactor housing (16), wherein the scraper or wiper (36) comprises at least one scraper or wiper blade (42) for running along an inner side (44) of the reactor housing (16). Radial mixing of a flow within the reactor housing (16) is achieved by the rotational motion of the scraper or wiper (36), dominating the effects of gravity and selectively allowing a piston, loop, or return flow within the reactor (10) by shaping the scraper or wiper. Said selection allows the reaction conditions in the axial direction of the reactor housing (16) to be predicted and individually suitable reaction conditions to be adjusted and controlled along the reactor housing, so that in particular a desired molecular weight distribution can be set.

IPC Classes  ?

• B01J 19/20 - Stationary reactors having moving elements inside in the form of helices, e.g. screw reactors

Abstract

The present invention relates to water and solvent-free polymers, in particular water and solvent- free synthetic rubber products like non-halogenated and halogenated butyl rubber products as well as a process for the production thereof. The invention further relates to a device suitable to accomplish said process.

IPC Classes  ?

• C08C 2/00 - Treatment of rubber solutions
• C08L 9/00 - Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
• C08L 23/22 - Copolymers of isobutene; Butyl rubber

Abstract

An integrated process for the solution polymerization and subsequent halogenation of butyl rubber in a common medium is disclosed. The process comprises providing a solution polymerization reactor containing a C6 medium mixed with a monomer mixture comprising at least an isoolefin monomer and a multiolefin monomer in a mass ratio of monomer mixture to medium of from 61:39 to 80:20. Once polymerized, residual unreacted monomer mixture is separated from the rubber solution using a distillation process. The residual monomers may then be purified and recycled back into the reactor. The separated rubber solution is then halogenated. The process obviates the need for separating the rubber from the medium following polymerization, then re-dissolving it in another solvent for halogenation, thereby saving energy cost. The process optionally employs heat exchangers for the reactor feed streams to further reduce energy consumption.

IPC Classes  ?

• C08F 8/20 - Halogenation
• C08F 8/22 - Halogenation by reaction with free halogens