The invention relates to an energy efficient, fast and environmentally favourable process for the preparation of chlorinated butyl rubbers, that uses hypochloric acid (HOCl) and/or dichlorine monoxide (Cl2O) as halogenating agent. The chlorinated butyl rubbers prepared according to the aforementioned process exhibit an advantageous microstructure and a desirable content and ratio of chlorinated and non-chlorinated oligomers and are therefore also encompassed by the invention. The teachings herein also relate to chlorinated copolymers and polymer products that include a chlorinated copolymer.
A process for producing an unsaturated isoolefin copolymer involves: sonicating a solution of an initiator system in an organic solvent, the initiator system comprising a Lewis acid catalyst and a proton source, to produce a sonicated initiator solution, the sonicating performed at an energy input of 100 J/mL or greater, based on volume of the initiator solution; and then, contacting the sonicated initiator solution with a reaction mixture of at least one isoolefin monomer and at least one copolymerizable unsaturated monomer in an organic diluent to produce the unsaturated isoolefin copolymer. Sonication of the initiator solution improves catalyst activity, thereby improving conversion of the monomers during production of the unsaturated isoolefin copolymer.
A process for producing an isoolefin homopolymer comprises: sonicating a solution of an initiator system in an organic solvent, the initiator system comprising a Lewis acid catalyst and a proton source selected from the group consisting of water, an alcohol, a phenol, a thiol, a carboxylic acid or any mixture thereof, to produce a sonicated initiator solution, the sonicating performed at an energy input of 100 J/mL or greater, based on volume of the initiator solution; and then, contacting the sonicated initiator solution with a reaction mixture of an isoolefin monomer in an organic diluent to produce the isoolefin homopolymer.
A process for producing an unsaturated isoolefin copolymer involves: sonicating a solution of an initiator system in an organic solvent, the initiator system comprising a Lewis acid catalyst, a proton source and a tertiary ether, to produce a sonicated initiator solution, the sonicating performed at a sonication energy input in J/mL that is based on volume of the initiator solution; and then, contacting the sonicated initiator solution with a reaction mixture of at least one isoolefin monomer and at least one copolymerizable unsaturated monomer in an organic diluent to produce the unsaturated isoolefin copolymer; wherein the combination of sonication input energy and molar ratio of tertiary ether to Lewis acid catalyst satisfies Equation 1: 4.01 < (0.587342)+(64.19198 x Molar Ratio Tertiary Ether)+(0.010807 x Sonication Input Energy)+(0.094975 x Molar Ratio Tertiary Ether x Sonication Input Energy)–(489.22317 x Molar Ratio Tertiary Ether 2)–(0.000042 x Sonication Input Energy 2).
A process for producing a halogenated isoolefin copolymer involves contacting an unsaturated isoolefin copolymer cement, the cement comprising an unsaturated isoolefin copolymer dissolved in an organic solvent, under halogenation conditions with a halogenating agent and an aqueous solution of a potassium salt-based oxidant to form a two-phase reaction medium comprising an organic phase and an aqueous phase, the oxidant capable of converting hydrogen halide to free halogen. The process provides improved halogen recovery, is less sensitive to the presence of water, and makes use of more stable and less environmentally damaging oxidants.
A process for producing a halogenated isoolefin copolymer involves contacting an unsaturated isoolefin copolymer cement, the cement comprising an unsaturated isoolefin copolymer dissolved in an organic solvent, under halogenation conditions with a halogenating agent and an aqueous solution of an oxidant and a phase transfer catalyst to form a two-phase reaction medium comprising an organic phase and an aqueous phase, the oxidant capable of converting hydrogen halide to free halogen and the phase transfer catalyst being a compound of Formula (I): Formula (I) where: M+is a cation of a Group VA element; X-12341-301-30 organic moiety. The process provides improved halogen recovery, is less sensitive to the presence of water, and can make use of a variety of different oxidants.
1-20 organic peracid oxidant to form a two-phase reaction medium having an organic phase and an aqueous phase, the organic peracid oxidant capable of converting hydrogen halide to free halogen; and, recovering halogenated isoolefin copolymer.
2O) as halogenating agent. The process comprises reacting a copolymer with hypochlorous acid and/or dichlorine oxide. The copolymer comprises units derived from an isoolefin monomer and units derived from a multiolefin monomer. A preferred isoolefin is isobutene and a preferred multiolefin is isoprene.
A process for producing a halogenated isoolefin copolymer involves contacting an unsaturated isoolefin copolymer cement, the cement containing an unsaturated isoolefin copolymer dissolved in an organic solvent, under halogenation conditions with a halogenating agent and an aqueous solution of an organic peracid oxidant to form a two-phase reaction medium having an organic phase and an aqueous phase, the organic peracid oxidant capable of converting hydrogen halide to free halogen. The process leads to higher halogen utilization even when the cement contains significant amounts of water and without the use of an emulsifier.
A process for producing a halogenated isoolefin copolymer involves contacting an unsaturated isoolefin copolymer cement, the cement containing an unsaturated isoolefin copolymer dissolved in an organic solvent, under halogenation conditions with a halogenating agent and an aqueous solution of an organic peracid oxidant to form a two-phase reaction medium having an organic phase and an aqueous phase, the organic peracid oxidant capable of converting hydrogen halide to free halogen. The process leads to higher halogen utilization even when the cement contains significant amounts of water and without the use of an emulsifier.
The invention relates to an efficient process for the preparation of isoolefin polymers such as polyisobutene or butyl rubber by polymerization of isobutene and optionally further monomers in the presence of an initiator system comprising at least one boron or aluminium compound and at least one tertiary alkyl ether.
A Brønsted-Lowry acid initiator system for cationic polymerization of an ethylenically unsaturated monomer involves an initiator having a structure of Formula (I) in an anhydrous polymerization medium:
+; and, x is 0 when L is absent, or x is 0.5 or more when L is present.
C07F 9/00 - Compounds containing elements of Groups 5 or 15 of the Periodic System
C08F 4/20 - Metallic compounds other than hydrides and other than metallo-organic compounds; Boron halide or aluminium halide complexes with organic compounds containing oxygen of antimony, bismuth, vanadium, niobium, or tantalum
The invention relates to an efficient process for the preparation and isolation of rubber particles formed in aqueous media and highly pure rubbers obtained thereby. The invention further relates to copolymer products comprising the same or derived therefrom.
C08J 3/07 - Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media from polymer solutions
C08L 23/22 - Copolymers of isobutene; Butyl rubber
C09K 3/10 - Materials not provided for elsewhere for sealing or packing joints or covers
A process for producing a crosslinked polymer involves contacting an epoxidized unsaturated isoolefin copolymer with a catalytic amount of an acid in an absence of a solvent. A process for producing a hydroxylated unsaturated isoolefin copolymer involves contacting an epoxidized unsaturated isoolefin copolymer with a catalytic amount of an acid in an absence of a solvent. A hydroxylated unsaturated isoolefin copolymer having hydroxyl groups in endo configurations may be produced thereby.
The invention relates to a method to reduce or prevent agglomeration of particles of halogenated rubbers in aqueous media by LCST compounds as well as highly pure halogenated rubbers. The invention further relates to halogenated elastomer products comprising the same or derived therefrom.
C08J 3/07 - Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media from polymer solutions
C08J 3/21 - Compounding polymers with additives, e.g. colouring in the presence of a liquid phase the polymer being premixed with a liquid phase
C08J 3/24 - Crosslinking, e.g. vulcanising, of macromolecules
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
B29B 9/06 - Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
16.
Elastomeric ethylene/α-olefin copolymer particles, and methods and articles thereof
The teachings herein relates to elastomeric particles including 98.5 weight percent or more of an elastomeric ethylene/α-olefin copolymer. The copolymer preferably has a weight average molecular weight of 10 to 2,000 kg/mol. The copolymer preferably has a Mooney viscosity of at least 10 (ML 1+4 at 125° C., ASTM D1646). The particles preferably include 0 to 0.4 weight percent of salts of multivalent metal ions. The salts of multivalent metal ions preferably includes stearates and palmitates of multivalent metal ions. The elastomeric ethylene/α-olefin copolymer preferably is an EPM or an EPDM. The blends including the particles preferably comprise a different elastomer, a filler, or a curing system.
C08L 23/16 - Ethene-propene or ethene-propene-diene copolymers
C08J 3/03 - Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
C08J 3/07 - Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media from polymer solutions
The invention relates to an energy efficient, fast and environmentally favourable process for the preparation of chlorinated butyl rubbers, that uses hypochlorous acid (HOCl) and/or dichlorine monoxide (Cl2O) as halogenating agent. The process comprises reacting a copolymer with hypochlorous acid and/or dichlorine oxide. The copolymer comprises units derived from an isoolefin monomer and units derived from a multiolefin monomer. A preferred isoolefin is isobutene and a preferred multiolefin is isoprene.
A continuous process for producing a halogenated isoolefin copolymer involves: polymerizing at least one isoolefin monomer and at least one copolymerizable unsaturated monomer in an organic diluent to produce a halogenatable isoolefin copolymer in an organic medium; contacting the organic medium with an aqueous medium comprising an LCST anti-agglomerant compound; removing or partially removing the organic diluent to produce an aqueous slurry of the halogenatable isoolefin copolymer; dissolving the aqueous slurry in an organic solvent in a closed apparatus to form an unsaturated halogenatable copolymer cement in water, and phase separating the water from the cement in the apparatus; contacting the separated halogenatable isoolefin copolymer cement with a halogenating agent and an aqueous solution of a C1-20 organic peracid oxidant to form a two-phase reaction medium having an organic phase and an aqueous phase, the organic peracid oxidant capable of converting hydrogen halide to free halogen; and, recovering halogenated isoolefin copolymer.
The invention relates to an efficient process for the preparation of isoolefin polymers such as polyisobutene or butyl rubber by polymerization of isobutene and optionally further monomers in the presence of an initiator system comprising at least one boron or aluminium compound and at least one tertiary alkyl ether.
A process for producing a halogenated isoolefin copolymer involves contacting an unsaturated isoolefin copolymer cement, the cement containing an unsaturated isoolefin copolymer dissolved in an organic solvent, under halogenation conditions with a halogenating agent and an aqueous solution of an organic peracid oxidant to form a two-phase reaction medium having an organic phase and an aqueous phase, the organic peracid oxidant capable of converting hydrogen halide to free halogen. The process leads to higher halogen utilization even when the cement contains significant amounts of water and without the use of an emulsifier.
A process for producing a halogenated isoolefin copolymer involves contacting an unsaturated isoolefin copolymer cement, the cement containing an unsaturated isoolefin copolymer dissolved in an organic solvent, under halogenation conditions with a halogenating agent and an aqueous solution of an organic peracid oxidant to form a two- phase reaction medium having an organic phase and an aqueous phase, the organic peracid oxidant capable of converting hydrogen halide to free halogen. The process leads to higher halogen utilization even when the cement contains significant amounts of water and without the use of an emulsifier.
The invention relates to an efficient process for the preparation and isolation of rubber particles formed in aqueous media and highly pure rubbers obtained thereby. The invention further relates to copolymer products comprising the same or derived therefrom.
C08J 3/03 - Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
C08J 3/20 - Compounding polymers with additives, e.g. colouring
C08J 3/24 - Crosslinking, e.g. vulcanising, of macromolecules
C09K 3/10 - Materials not provided for elsewhere for sealing or packing joints or covers
C08F 210/12 - Isobutene with conjugated diolefins, e.g. butyl rubber
C08J 3/07 - Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media from polymer solutions
This invention relates to elastomeric coatings for electronics. Disclosed is a electronic device comprising a substrate layer, a conductive layer and an encapsulant layer. The encapsulant layer comprises at least a butyl rubber material. The butyl rubber encapsulant prevents a change in resistivity of the conductive layer following exposure to nitric acid vapour for 12 hours or hydrochloric acid vapour for 10 hours.
B32B 25/18 - Layered products essentially comprising natural or synthetic rubber comprising butyl or halobutyl rubber
B32B 17/10 - Layered products essentially comprising sheet glass, or fibres of glass, slag or the like comprising glass as the main or only constituent of a layer, next to another layer of a specific substance of synthetic resin
B32B 17/06 - Layered products essentially comprising sheet glass, or fibres of glass, slag or the like comprising glass as the main or only constituent of a layer, next to another layer of a specific substance
H01L 23/29 - Encapsulation, e.g. encapsulating layers, coatings characterised by the material
24.
Multi-modal polyisoolefin compositions and processes therefor
p) of greater than about 250,000 g/mol, the low molecular weight fraction present in the composition in an amount less than the high molecular weight fraction. Cured articles produced from the polyisoolefin-based polymer composition exhibit improved processability while maintaining physical properties.
C08L 23/22 - Copolymers of isobutene; Butyl rubber
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
B60C 1/00 - Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
25.
Polymer compositions having a halo-containing polymer with a multi-functional phosphine linkage
A polymer composition is provided with a multi-modal molecular weight distribution of a halo-containing polymer. The halo-containing polymer is has multi-functional phosphine linkages at less than 10% of halo sites of the halo-containing polymer that were available before multi-functional phosphine linking. A process for producing a polymer composition having a multi-modal molecular weight distribution involves dispersing a multi-functional phosphine compound in a halo-containing polymer, the halo-containing polymer comprising a total number of available halo sites, and reacting the multi-functional phosphine compound with the halo-containing polymer at an elevated temperature to produce the polymer composition in which less than 10% of the total number of available halo sites are reacted with the phosphine compound to provide multi-functional phosphine linkages in the halo-containing compound.
A process for producing a crosslinked polymer involves contacting an epoxidized unsaturated isoolefin copolymer with a catalytic amount of an acid in an absence of a solvent. A process for producing a hydroxylated unsaturated isoolefin copolymer involves contacting an epoxidized unsaturated isoolefin copolymer with a catalytic amount of an acid in an absence of a solvent. A hydroxylated unsaturated isoolefin copolymer having hydroxyl groups in endo configurations may be produced thereby.
A process for epoxidation of an unsaturated polymer involves mixing an unsaturated polymer and a peroxy acid in an absence of solvent to produce an epoxidized polymer. The process may require no solvent, require no catalyst, require no or little applied external heat input, require no applied cooling, require less epoxidation agent, be faster and/or result in more efficient conversion of the unsaturated polymer.
The invention relates to a method to reduce or prevent agglomeration of rubber particles in aqueous media by LCST compounds and elastomers obtained thereby. The invention further relates to elastomer products comprising the same or derived therefrom.
C08J 3/07 - Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media from polymer solutions
C08L 23/22 - Copolymers of isobutene; Butyl rubber
C08L 9/00 - Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
A process for producing an allylic alcohol functionalized butyl rubber involves contacting an epoxidized butyl rubber with benzoic acid, an analogue of benzoic acid or a C1-C7 alkanoic acid. The process and a polymer compound comprising the epoxidized butyl rubber and the benzoic acid, analogue of benzoic acid or a C1-C7 alkanoic acid provide a cost effective route to a polar functionalized butyl rubber, particularly to butyl rubber comprising allylic alcohol functional groups.
A polyisoolefin-based polymer composition having a multimodal molecular weight distribution is described, which can be prepared by the late addition of a chain transfer agent to the polymerization process. The polymer composition has a low molecular weight fraction having a peak molecular weight (Mp) of less than about 100,000 g/mol and a high molecular weight fraction having a peak molecular weight (Mp) of greater than about 250,000 g/mol, the low molecular weight fraction present in the composition in an amount less than the high molecular weight fraction. Cured articles produced from the polyisoolefin-based polymer composition exhibit improved processability while maintaining physical properties.
A method of separating a polyisoolefin elastomer from non-polymeric components in an organic solvent involves ultrafiltration of a solution of the polyisoolefin elastomer and non-polymeric components in an organic solvent through a semipermeable membrane to substantially retain the polyisoolefin elastomer in a retentate and provide the non-polymeric components in a permeate. Advantageously, stabilizers for the polyisoolefin elastomer are retained in the retentate along with the polyisoolefin elastomer, permeate flux through the membrane is higher as concentration of the polyisoolefin elastomer in the solution increases up to a concentration limit, the separated polyisoolefin elastomer in the retentate has a molecular weight that can be substantially unchanged even when ultrafiltration is conducted at elevated temperature and the amount of polyisoolefin elastomer in the permeate is unmeasurable providing an oligomer-rich permeate uncontaminated by polyisoolefin elastomer. A process for curing a polyisoolefin copolymer involves reducing content of an oligomer to 900 ppm or less in a mixture of the oligomer and the polyisoolefin copolymer to produce an oligomer-depleted mixture, and adding a resin cure system to the oligomer-depleted mixture to cure the polyisoolefin copolymer.
A polymer composition is provided with a multi-modal molecular weight distribution of a halo-containing polymer. The halo-containing polymer is has multi-functional phosphine linkages at less than 10% of halo sites of the halo-containing polymer that were available before multi-functional phosphine linking. A process for producing a polymer composition having a multi-modal molecular weight distribution involves dispersing a multi-functional phosphine compound in a halo-containing polymer, the halo-containing polymer comprising a total number of available halo sites, and reacting the multi-functional phosphine compound with the halo- containing polymer at an elevated temperature to produce the polymer composition in which less than 10% of the total number of available halo sites are reacted with the phosphine compound to provide multi-functional phosphine linkages in the halo-containing compound.
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
C08J 3/24 - Crosslinking, e.g. vulcanising, of macromolecules
C08L 23/22 - Copolymers of isobutene; Butyl rubber
C08L 23/32 - 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 phosphorus- or sulfur-containing compounds
C08F 210/12 - Isobutene with conjugated diolefins, e.g. butyl rubber
33.
POLYMER COMPOSITIONS HAVING A HALO-CONTAINING POLYMER WITH A MULTI-FUNCTIONAL PHOSPHINE LINKAGE
A polymer composition is provided with a multi-modal molecular weight distribution of a halo-containing polymer. The halo-containing polymer is has multi-functional phosphine linkages at less than 10% of halo sites of the halo-containing polymer that were available before multi-functional phosphine linking. A process for producing a polymer composition having a multi-modal molecular weight distribution involves dispersing a multi-functional phosphine compound in a halo-containing polymer, the halo-containing polymer comprising a total number of available halo sites, and reacting the multi-functional phosphine compound with the halo- containing polymer at an elevated temperature to produce the polymer composition in which less than 10% of the total number of available halo sites are reacted with the phosphine compound to provide multi-functional phosphine linkages in the halo-containing compound.
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
C08F 210/12 - Isobutene with conjugated diolefins, e.g. butyl rubber
C08J 3/24 - Crosslinking, e.g. vulcanising, of macromolecules
C08L 23/22 - Copolymers of isobutene; Butyl rubber
C08L 23/32 - 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 phosphorus- or sulfur-containing compounds
A process for epoxidation of an unsaturated polymer involves mixing an unsaturated polymer and a peroxy acid in an absence of solvent to produce an epoxidized polymer. The process may require no solvent, require no catalyst, require no or little applied external heat input, require no applied cooling, require less epoxidation agent, be faster and/or result in more efficient conversion of the unsaturated polymer.
A process for producing an allylic alcohol functionalized butyl rubber involves contacting an epoxidized butyl rubber with benzoic acid, an analogue of benzoic acid or a C1-C7 alkanoic acid. The process and a polymer compound comprising the epoxidized butyl rubber and the benzoic acid, analogue of benzoic acid or a C1-C7 alkanoic acid provide a cost effective route to a polar functionalized butyl rubber, particularly to butyl rubber comprising allylic alcohol functional groups.
C08C 19/40 - Addition of a reagent which reacts with a hetero atom or a group containing hetero atoms of the macromolecule reacting with oxygen or oxygen-containing groups with epoxy radicals
A process for epoxidation of an unsaturated polymer involves mixing an unsaturated polymer and a peroxy acid in an absence of solvent to produce an epoxidized polymer. The process may require no solvent, require no catalyst, require no or little applied external heat input, require no applied cooling, require less epoxidation agent, be faster and/or result in more efficient conversion of the unsaturated polymer.
A process for producing a crosslinked polymer involves contacting an epoxidized unsaturated isoolefin copolymer with a catalytic amount of an acid in an absence of a solvent. A process for producing a hydroxylated unsaturated isoolefin copolymer involves contacting an epoxidized unsaturated isoolefin copolymer with a catalytic amount of an acid in an absence of a solvent. A hydroxylated unsaturated isoolefin copolymer having hydroxyl groups in endo configurations may be produced thereby.
A polymer nanocomposite coating of an elastomeric film containing at least 30 wt% conductive nanoparticles based on combined weight of elastomer and conductive nanoparticles is provided. The conductive nanoparticles have an average particle size along each dimension of less than 500 nm for nanoparticles having an aspect ratio of less than 20:1 or have an average particle size along each dimension of less than 2000 nm for nanoparticles having an aspect ratio of 20:1 or greater. The conductive nanoparticles are formed into hierarchical micro- and nano-sized aggregates having re-entrant morphology. The coating is both superoleophobic and conductive and retains these properties even when stretched under strain to over 100%. The coatings may be produced with simple spray technology.
C09D 147/00 - Coating compositions based on homolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds; Coating compositions based on derivatives of such polymers
C09D 201/00 - Coating compositions based on unspecified macromolecular compounds
The invention relates to a method to reduce or prevent agglomeration of rubber particles in aqueous media by LCST compounds and elastomers obtained thereby. The invention further relates to elastomer products comprising the same or derived therefrom.
C08L 23/22 - Copolymers of isobutene; Butyl rubber
C08J 3/14 - Powdering or granulating by precipitation from solutions
C08J 3/07 - Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media from polymer solutions
C08J 3/24 - Crosslinking, e.g. vulcanising, of macromolecules
A copolymer has low levels of isoprenoid (short chain branching) structures. A process for producing the copolymer having low isoprenoid content involves contacting at least one isoolefin monomer with at least one multiolefin and/or β-pinene monomer in the presence of at least one Lewis acid and at least one initiator in a diluent. The diluent may contain a hydrofluorinated olefin (HFO) comprising at least three carbon atoms and at least three fluorine atoms. Hydrofluorinated olefins used in the present invention are better diluents for butyl slurry cationic polymerization than saturated hydrofluorocarbons. Blends of saturated hydrofluorocarbons (e.g. 1,1,1,2-tetrafluoroethane) with an inert solvent (e.g. methyl chloride) may also be used as diluents.
C08F 36/00 - Homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds
C08F 210/00 - Copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
C08F 210/12 - Isobutene with conjugated diolefins, e.g. butyl rubber
C08F 6/10 - Removal of volatile materials, e.g. monomers, solvents
41.
Highly unsaturated multi-modal polyisoolefin composition and process for preparation thereof
A polyisoolefin-based polymer composition having a multimodal molecular weight distribution and a level of unsaturation of greater than about 4 mol % is described, which can be prepared by co-polymerizing 70-96 vol % isoolefin monomer and 30-4 vol % β-pinene or multi-olefin monomer, based on volume of isoolefin monomer and β-pinene or multi-olefin monomer, in a solution comprising 0-30 vol % aliphatic hydrocarbon diluent, based on volume of the solution, and an alkylaluminum halide initiator system. The polyisoolefin-based polymer composition has a multimodal molecular weight distribution having a first molecular weight fraction having a peak molecular weight (Mp) of less than about 300 kg/mol, and a second molecular weight fraction having a peak molecular weight (Mp) of greater than about 1000 kg/mol or at least 3 times greater than the Mp of the first molecular weight fraction.
A copolymer has low levels of cyclic oligomeric compounds, which are undesirable impurities in certain applications. The cyclic oligomeric compounds are provided in an advantageously low ratio of C21/C13 oligomers. The C13 oligomers are extractable using steam to further reduce the total amount of cyclic oligomers. A process for producing the copolymer having low levels of cyclic oligomers involves contacting at least one isoolefin monomer with at least one multiolefin and/or β-pinene monomer in the presence of at least one Lewis acid and at least one initiator in a diluent. The diluent contains a hydrofluorinated olefin (HFO) comprising at least three carbon atoms and at least three fluorine atoms. Hydrofluorinated olefins used in the present invention are better diluents for butyl slurry cationic polymerization than saturated hydrofluorocarbons.
The invention relates to an efficient polymerization process and its use to produce novel copolymers with a specific micro structure. In particular, the invention relates to butyl rubbers with novel micro structure, preferably those obtainable by copolymerization of monomer mixtures comprising isobutylene and isoprene in diluents comprising 2,3,3,3 -tetrafluoro-1-propene. In a further aspect the invention relates to halogenated copolymers obtainable from such novel copolymers by halogenation.
C08F 36/00 - Homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds
C08F 10/00 - Homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond
C08F 210/12 - Isobutene with conjugated diolefins, e.g. butyl rubber
A process for producing a copolymer involves contacting at least one isoolefin monomer with at least one multiolefin and/or β-pinene monomer in the presence of at least one Lewis acid and at least one initiator in a diluent. The diluent contains a hydrofluorinated olefin (HFO) comprising a tetrafluorinated propene. Copolymers produced by a process of the present invention have a cyclic oligomer content lower than comparable polymers produced in a butyl rubber slurry process using 1,1,1,2-tetrafluoroethane and/or methyl chloride as a diluent as well as a more favorable ratio of C21/C13. Hydrofluorinated olefins used in the present invention are better diluents for butyl slurry cationic polymerization than saturated hydro fluorocarbons.
C08F 4/52 - Metals; Metal hydrides; Metallo-organic compounds; Use thereof as catalyst precursors selected from light metals, zinc, cadmium, mercury, copper, silver, gold, boron, gallium, indium, thallium, rare earths, or actinides selected from boron, aluminium, gallium, indium, thallium, or rare earths
C08F 36/00 - Homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, at least one having two or more carbon-to-carbon double bonds
C08F 210/12 - Isobutene with conjugated diolefins, e.g. butyl rubber
The invention relates to an efficient process for the preparation and isolation of rubber particles formed in aqueous media and highly pure rubbers obtained thereby. The invention further relates to copolymer products comprising the same or derived therefrom.
C08J 3/03 - Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
C08J 3/20 - Compounding polymers with additives, e.g. colouring
C08J 3/24 - Crosslinking, e.g. vulcanising, of macromolecules
C09K 3/10 - Materials not provided for elsewhere for sealing or packing joints or covers
C08F 210/12 - Isobutene with conjugated diolefins, e.g. butyl rubber
C08J 3/07 - Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media from polymer solutions
The invention relates to a method to reduce or prevent agglomeration of rubber particles in aqueous media by LCST compounds and elastomers obtained thereby. The invention further relates to elastomer products comprising the same or derived therefrom.
C08J 3/07 - Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media from polymer solutions
C08L 23/22 - Copolymers of isobutene; Butyl rubber
The invention relates to a method to reduce or prevent agglomeration of particles of halogenated rubbers in aqueous media by LCST compounds as well as highly pure halogenated rubbers. The invention further relates to halogenated elastomer products comprising the same or derived therefrom.
C08J 3/07 - Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media from polymer solutions
C08J 3/21 - Compounding polymers with additives, e.g. colouring in the presence of a liquid phase the polymer being premixed with a liquid phase
C08J 3/24 - Crosslinking, e.g. vulcanising, of macromolecules
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
B29B 9/06 - Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
48.
Rubbers with tunable levels of metal containing anti-agglomerants
The invention relates to an efficient process for the preparation and isolation of rubber particles formed in aqueous media having a tunable level of metal containing anti-agglomerants and rubber particles obtained thereby. The invention further relates to copolymer products comprising the same or derived therefrom.
C09K 3/10 - Materials not provided for elsewhere for sealing or packing joints or covers
C08J 3/07 - Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media from polymer solutions
The invention relates to a method to reduce or prevent agglomeration of elastomeric ethylene/α-olefin copolymer particles in aqueous media by LCST compounds.
C09D 133/26 - Homopolymers or copolymers of acrylamide or methacrylamide
C08J 3/07 - Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media from polymer solutions
C08J 3/03 - Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
A halogenated polyisoolefin copolymer is composed of at least one isoolefin monomer, at least one multiolefin monomer, a halogen content of 0.05-2.5 mol%, and a halogenated oligomer content of less than 65% of total oligomer content in the halogenated polyisoolefin copolymer. The copolymer has low halogen content and significantly reduced levels of halogenated oligomers. The copolymer is especially useful in the pharmaceutical and food industries, for example as pharmaceutical and food product seals and closures.
C08L 23/22 - Copolymers of isobutene; Butyl rubber
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
51.
HALOGENATED POLYISOOLEFINS WITH REDUCED HALOGENATED OLIGOMERS
A halogenated polyisoolefin copolymer is composed of at least one isoolefin monomer, at least one multiolefin monomer, a halogen content of 0.05-2.5 mol%, and a halogenated oligomer content of less than 65% of total oligomer content in the halogenated polyisoolefin copolymer. The copolymer has low halogen content and significantly reduced levels of halogenated oligomers. The copolymer is especially useful in the pharmaceutical and food industries, for example as pharmaceutical and food product seals and closures.
C08L 23/22 - Copolymers of isobutene; Butyl rubber
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
52.
ULTRAFILTRATION OF POLYISOOLEFIN COPOLYMERS AND POLYISOOLEFIN COPOLYMERS WITH REDUCED OLIGOMER CONTENT
A method of separating a polyisoolefin elastomer from non-polymeric components in an organic solvent involves ultrafiltration of a solution of the polyisoolefin elastomer and non- polymeric components in an organic solvent through a semipermeable membrane to substantially retain the polyisoolefin elastomer in a retentate and provide the non-polymeric components in a permeate. Advantageously, stabilizers for the polyisoolefin elastomer are retained in the retentate along with the polyisoolefin elastomer, permeate flux through the membrane is higher as concentration of the polyisoolefin elastomer in the solution increases up to a concentration limit, the separated polyisoolefin elastomer in the retentate has a molecular weight that can be substantially unchanged even when ultrafiltration is conducted at elevated temperature and the amount of polyisoolefin elastomer in the permeate is unmeasurable providing an oligomer-rich permeate uncontaminated by polyisoolefin elastomer. A process for curing a polyisoolefin copolymer involves reducing content of an oligomer to 900 ppm or less in a mixture of the oligomer and the polyisoolefin copolymer to produce an oligomer-depleted mixture, and adding a resin cure system to the oligomer- depleted mixture to cure the polyisoolefin copolymer.
A polymer-drug conjugate, which can be used in medical applications such as stents, has at least one active agent conjugated through a carboxylic acid moiety to a copolymer derived from at least one isoolefin monomer and at least one copolymerizable monomer, where the copolymerizable monomer is at least one multiolefin monomer, a β-pinene monomer or a mixture thereof. Such conjugates show improved adhesion to stainless steel and a substantial decrease in burst release of paclitaxel form a drug eluting stent (DES).
A61K 47/48 - Medicinal preparations characterised by the non-active ingredients used, e.g. carriers, inert additives the non-active ingredient being chemically bound to the active ingredient, e.g. polymer drug conjugates
A61L 27/54 - Biologically active materials, e.g. therapeutic substances
A61L 31/16 - Biologically active materials, e.g. therapeutic substances
A61P 9/00 - Drugs for disorders of the cardiovascular system
C08F 210/12 - Isobutene with conjugated diolefins, e.g. butyl rubber
A polymeric compound involves a blend of 50 wt% or greater of a thermoplastic having an average melting point (Tm) of less than 200 °C and less than 50 wt% of a butyl rubber ionomer dispersed in a matrix of the thermoplastic, weights based on total weight of the thermoplastic and butyl rubber ionomer. Such blends may exhibit improved physical properties compared to unblended thermoplastic, particularly ultimate elongation and/or damping. The polymeric compounds are useful for forming a variety of articles of manufacture.
The invention relates to a method to reduce or prevent agglomeration of particles of optionally halogenated rubbers in aqueous media by LCST compounds, their purification as well as ultrapure optionally halogenated rubbers. The invention further relates to (halogenated) copolymer products comprising the same or derived therefrom.
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
A method of separating a polyisoolefin elastomer from non-polymeric components in an organic solvent involves ultrafiltration of a solution of the polyisoolefin elastomer and non-polymeric components in an organic solvent through a semipermeable membrane to substantially retain the polyisoolefin elastomer in a retentate and provide the non- polymeric components in a permeate. Advantageously, stabilizers for the polyisoolefin elastomer are retained in the retentate along with the polyisoolefin elastomer, permeate flux through the membrane is higher as concentration of the polyisoolefin elastomer in the solution increases up to a concentration limit, the separated polyisoolefin elastomer in the retentate has a molecular weight that can be substantially unchanged even when ultrafiltration is conducted at elevated temperature and the amount of polyisoolefin elastomer in the permeate is unmeasurable providing an oligomer-rich permeate uncontaminated by polyisoolefin elastomer.
The invention relates to a process for the preparation of an aqueous slurry comprising a plurality of elastomer particles suspended therein, the process comprises: polymerizing monomers comprising at least one isoolefin and at least one multiolefin in a reaction medium comprising an organic diluent and an initiator system to form an organic medium comprising: i) at least one elastomer, and ii) the organic diluent; contacting the organic medium with an aqueous medium comprising at least one lower critical solution temperature (LCST) compound, and removing at least a portion of the organic diluent to obtain an aqueous slurry comprising elastomer particles. The process reduces or prevents agglomeration of the elastomer particles in aqueous media by LCST compounds and elastomers obtained thereby. The present also describes a process for the preparation of elastomer particles, and to elastomer products comprising the same or derived therefrom.
C08L 23/22 - Copolymers of isobutene; Butyl rubber
C08J 3/07 - Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media from polymer solutions
C08J 3/24 - Crosslinking, e.g. vulcanising, of macromolecules
The invention relates to a method to reduce or prevent agglomeration of rubber particles in aqueous media by LCST compounds and elastomers obtained thereby. The invention further relates to elastomer products comprising the same or derived therefrom..
C08L 23/22 - Copolymers of isobutene; Butyl rubber
C08J 3/07 - Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media from polymer solutions
C08J 3/24 - Crosslinking, e.g. vulcanising, of macromolecules
The invention relates to an efficient polymerization process and its use to produce novel copolymers with a specific microstructure. In particular, the invention relates to butyl rubbers with novel microstructure, preferably those obtainable by copolymerization of monomer mixtures comprising isobutylene and isoprene. In a further aspect the invention relates to halogenated copolymers obtainable from such novel copolymers by halogenation.
A copolymer has high levels of multolefin incorporation. A process for producing the copolymer having high levels of multiolefin incorporation involves contacting at least one isoolefin monomer with at least one multiolefin and/or β-pinene monomer in the presence of at least one Lewis acid and at least one initiator in a diluent. The diluent contains a hydrofluorinated olefin (HFO) comprising at least three carbon atoms and at least three fluorine atoms. Hydrofluorinated olefins used in the present invention are better diluents for butyl slurry cationic polymerization than saturated hydrofluorocarbons.
A copolymer has low levels of isoprenoid (short chain branching) structures. A process for producing the copolymer having low isoprenoid content involves contacting at least one isoolefin monomer with at least one multiolefin and/or β-pinene monomer in the presence of at least one Lewis acid and at least one initiator in a diluent. The diluent may contain a hydrofluorinated olefin (HFO) comprising at least three carbon atoms and at least three fluorine atoms. Hydrofluorinated olefins used in the present invention are better diluents for butyl slurry cationic polymerization than saturated hydrofluorocarbons. Blends of saturated hydrofluorocarbons (e.g. 1,1,1,2-tetrafluoroethane) with an inert solvent (e.g. methyl chloride) may also be used as diluents.
A copolymer has low levels of cyclic oligomeric compounds, which are undesirable impurities in certain applications. The cyclic oligomeric compounds are provided in an advantageously low ratio of C21/C13 oligomers. The C13 oligomers are extractable using steam to further reduce the total amount of cyclic oligomers. A process for producing the copolymer having low levels of cyclic oligomers involves contacting at least one isoolefin monomer with at least one multiolefin and/or β-pinene monomer in the presence of at least one Lewis acid and at least one initiator in a diluent. The diluent contains a hydrofluorinated olefin (HFO) comprising at least three carbon atoms and at least three fluorine atoms. Hydrofluorinated olefins used in the present invention are better diluents for butyl slurry cationic polymerization than saturated hydrofluorocarbons.
Methods are provided to efficiently produce butyl rubber via a slurry polymerization process. The process comprises providing at least two monomers, wherein at least one monomer is an isoolefm and at least one monomer is a multiolefm. The monomers are combined with an initiator and an organic diluent comprising 40-60 volume % of methyl chloride and 40-60 volume % of 1,1,1, 2-tetrafluoroethane and polymerized.
The invention relates to an efficient polymerization process and its use to produce novel copolymers with a specific microstructure. In particular, the invention relates to butyl rubbers with novel microstructure, preferably those obtainable by copolymerization of monomer mixtures comprising isobutylene and isoprene. In a further aspect the invention relates to halogenated copolymers obtainable from such novel copolymers by halogenation.
A process for producing a copolymer involves contacting at least one isoolefin monomer with at least one multiolefin and/or ß-pinene monomer in the presence of at least one Lewis acid and at least one initiator in a diluent. The diluent contains a hydrofluorinated olefin (HFO) comprising a tetrafluorinated propene. Copolymers produced by a process of the present invention have a cyclic oligomer content lower than comparable polymers produced in a butyl rubber slurry process using 1,1,1,2- tetrafluoroethane and/or methyl chloride as a diluent as well as a more favourable ratio of C21/C13. Hydrofluorinated olefins used in the present invention are better diluents for butyl slurry cationic polymerization than saturated hydrofluorocarbons.
The invention relates to an efficient polymerization process and its use to produce novel copolymers with a specific microstructure. In particular, the invention relates to butyl rubbers with novel microstructure, preferably those obtainable by copolymerization of monomer mixtures comprising isobutylene and isoprene in diluents comprising 2,3,3,3-tetrafluoro-1-propene. In a further aspect the invention relates to halogenated copolymers obtainable from such novel copolymers by halogenation.
A polyisoolefin-based polymer composition having a multimodal molecular weight distribution and a level of unsaturation of greater than about 4 mol% is described, which can be prepared by co-polymerizing 70-96 vol% isoolefin monomer and 30-4 vol% β- pinene or multi-olefin monomer, based on volume of isoolefin monomer and β-pinene or multi-olefin monomer, in a solution comprising 0-30 vol% aliphatic hydrocarbon diluent, based on volume of the solution, and an alkylaluminum halide initiator system. The polyisoolefin-based polymer composition has a multimodal molecular weight distribution having a first molecular weight fraction having a peak molecular weight (Mp) of less than about 300 kg/mol, and a second molecular weight fraction having a peak molecular weight (Mp) of greater than about 1000 kg/mol or at least 3 times greater than the Mp of the first molecular weight fraction. The composition is processable while maintaining physical characteristics and dimensional stability necessary for handling prior to vulcanization.
A process for producing a copolymer involves contacting at least one isoolefin monomer with at least one multiolefin and/or β-pinene monomer in the presence of at least one Lewis acid and at least one initiator in a diluent. The diluent contains a hydrofluorinated olefin (HFO) comprising a tetrafluorinated propene. Copolymers produced by a process of the present invention have a cyclic oligomer content lower than comparable polymers produced in a butyl rubber slurry process using 1,1,1,2- tetrafluoroethane and/or methyl chloride as a diluent as well as a more favourable ratio of C21/C13. Hydrofluorinated olefins used in the present invention are better diluents for butyl slurry cationic polymerization than saturated hydrofluorocarbons.
The invention relates to an efficient polymerization process and its use to produce novel copolymers with a specific microstructure. In particular, the invention relates to butyl rubbers with novel microstructure, preferably those obtainable by copolymerization of monomer mixtures comprising isobutylene and isoprene in diluents comprising 2,3,3,3-tetrafluoro-1-propene. In a further aspect the invention relates to halogenated copolymers obtainable from such novel copolymers by halogenation.
Described here is a process for the preparation and isolation of rubber particles formed in aqueous media; highly pure rubbers obtained thereby; and copolymer products derived therefrom. The process comprises: a) providing a reaction medium comprising an organic diluent, and at least two monomers; b) polymerizing the monomers within the reaction medium with an initiator system to form a medium comprising the copolymer and the organic diluent; and c) contacting the medium obtained in step b) with an aqueous medium comprising at least one lower critical solution temperature (LCST) compound, and removing the organic diluent and removing the residual monomers to obtain the aqueous slurry comprising the copolymer particles; wherein the amount of the LCST compounds in the aqueous medium employed in step c) is from 1 to 20,000 ppm with respect to the amount of copolymer present in the medium obtained according to step b).
C08J 3/03 - Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
C08F 210/12 - Isobutene with conjugated diolefins, e.g. butyl rubber
A process to reduce or prevent agglomeration of particles of halogenated rubbers in aqueous media by lower critical solution temperature (LCST) compounds is described. The process comprises: A) contacting an organic medium with: i) at least one of a halogenated elastomer, and ii) an organic diluent with an aqueous medium comprising at least one LCST compound in the amount of 1 to 5,000 ppm measured with respect to the amount of the halogenated elastomer, the LCST compound with a cloud point of 0 to 100 C. to produce a mixture of dispersed halogenated elastomer particles and LCST compound; wherein the mixture has a temperature of about 50 C. to about 100 C.; and B) removing the organic diluent from the mixture to obtain an aqueous slurry. Also described are the mixture, the slurry and halogenated elastomer products and particles deriving from the process.
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
C08J 3/03 - Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
C08J 3/20 - Compounding polymers with additives, e.g. colouring
C08J 3/24 - Crosslinking, e.g. vulcanising, of macromolecules
A process for the preparation of an aqueous slurry that reduces or prevents agglomeration of elastomeric ethylene/a-olefin copolymer particles in aqueous media by lower critical solution temperature (LCST) compounds is described. The aqueous slurry comprising a plurality of elastomer particles suspended therein is prepared by the process comprising: A) contacting an organic medium including i) at least one elastomeric ethylene/a-olefin copolymer, and ii) an organic diluent with an aqueous medium comprising at least one LCST compound having a cloud point of 0 to 100 C., and B) removing at least partially the organic diluent to obtain an aqueous slurry comprising the elastomeric ethylene/a- olefin copolymer particles. Also described are elastomeric ethylene/a-olefin copolymer particles having an elastomeric ethylene/a-olefin copolymer content of 98.5 weight percent or more and articles made therefrom
C08L 23/16 - Ethene-propene or ethene-propene-diene copolymers
C08J 3/03 - Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
C08J 3/20 - Compounding polymers with additives, e.g. colouring
The invention relates to an efficient process for the preparation and isolation of rubber particles formed in aqueous media having a tunable level of metal containing anti- agglomerants and rubber particles obtained thereby. The invention further relates to copolymer products comprising the same or derived therefrom.
C08F 210/12 - Isobutene with conjugated diolefins, e.g. butyl rubber
C08J 3/03 - Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
C08J 3/24 - Crosslinking, e.g. vulcanising, of macromolecules
C09K 3/10 - Materials not provided for elsewhere for sealing or packing joints or covers
The invention relates to a method to reduce or prevent agglomeration of particles of halogenated rubbers in aqueous media by LCST compounds as well as highly pure halogenated rubbers. The invention further relates to halogenated elastomer products comprising the same or derived therefrom.
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
C08J 3/03 - Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
C08J 3/20 - Compounding polymers with additives, e.g. colouring
C08J 3/24 - Crosslinking, e.g. vulcanising, of macromolecules
Described here is a process for the preparation and isolation of rubber particles formed in aqueous media; highly pure rubbers obtained thereby; and copolymer products derived therefrom. The process comprises: a) providing a reaction medium comprising an organic diluent, and at least two monomers; b) polymerizing the monomers within the reaction medium with an initiator system to form a medium comprising the copolymer and the organic diluent; and c) contacting the medium obtained in step b) with an aqueous medium comprising at least one lower critical solution temperature (LCST) compound, and removing the organic diluent and removing the residual monomers to obtain the aqueous slurry comprising the copolymer particles; wherein the amount of the LCST compounds in the aqueous medium employed in step c) is from 1 to 20,000 ppm with respect to the amount of copolymer present in the medium obtained according to step b).
C08J 3/03 - Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
C08J 3/20 - Compounding polymers with additives, e.g. colouring
C08J 3/24 - Crosslinking, e.g. vulcanising, of macromolecules
The invention relates a process for the preparation of an aqueous slurry comprising a plurality of copolymer particles suspended therein, the process includes: contacting monomers comprising at least one isoolefin monomer and at least one multiolefin monomer in an organic diluent with an initiator system to polymerize the monomers to form copolymers in a medium comprising the copolymers, the organic diluent and optionally residual monomers; contacting the copolymer medium with an aqueous medium comprising at least one lower critical solution temperature compound having a cloud point of 0 to 100 C.; and removing at least partially the organic diluent and to the extent present in the medium removing at least partially the residual monomers to obtain an aqueous slurry comprising copolymer particles. The invention also relates to an aqueous slurry obtained by the process.
C08F 210/12 - Isobutene with conjugated diolefins, e.g. butyl rubber
C08J 3/03 - Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
C08J 3/24 - Crosslinking, e.g. vulcanising, of macromolecules
C09K 3/10 - Materials not provided for elsewhere for sealing or packing joints or covers
A process to reduce or prevent agglomeration of rubber particles in aqueous media by Lower Critical Solution Temperature (LCST) compounds and elastomer compositions obtained thereby are described. The process comprises: A) contacting an organic medium comprising i) at least one elastomer, and ii) an organic diluent with an aqueous medium comprising at least one LCST compound having a cloud point of 0 to 100 C.; and B) removing at least partially the organic diluent to obtain an aqueous slurry comprising elastomer particles. An exemplary elastomer composition comprises: at least 96.0 wt. % of an elastomer; at most 3.0 wt. % of salts of metal ions; and 1 ppm to 5,000 ppm of at least one LCST compound.The elastomer products comprising the same or derived therefrom are also described.
C08L 23/22 - Copolymers of isobutene; Butyl rubber
C08J 3/03 - Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
C08J 3/20 - Compounding polymers with additives, e.g. colouring
C08J 3/24 - Crosslinking, e.g. vulcanising, of macromolecules
The invention relates to an efficient process for the preparation and isolation of rubber particles formed in aqueous media and highly pure rubbers obtained thereby. The invention further relates to copolymer products comprising the same or derived therefrom.
C08J 3/03 - Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
C08J 3/20 - Compounding polymers with additives, e.g. colouring
C08J 3/24 - Crosslinking, e.g. vulcanising, of macromolecules
The invention relates to a method to reduce or prevent agglomeration of rubber particles in aqueous media by LCST compounds and elastomers obtained thereby. The invention further relates to elastomer products comprising the same or derived therefrom.
C08L 23/22 - Copolymers of isobutene; Butyl rubber
C08J 3/03 - Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
C08J 3/20 - Compounding polymers with additives, e.g. colouring
C08J 3/24 - Crosslinking, e.g. vulcanising, of macromolecules
80.
NOVEL ANTI-AGGLOMERANTS FOR ELASTOMERIC ETHYLENE/Α-OLEFIN COPOLYMERS
The invention relates to a method to reduce or prevent agglomeration of elastomeric ethylene/α-olefin copolymer particles in aqueous media by LCST compounds.
C08L 23/16 - Ethene-propene or ethene-propene-diene copolymers
C08J 3/03 - Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
C08J 3/20 - Compounding polymers with additives, e.g. colouring
Disclosed herein is a substrate having a surface modified to impart multi-scale roughness, thereby providing superhydrophobic and/or superoleophobic properties. The surface comprises a pattern of microscale pillars topped by a plurality of nanoparticles having a re-entrant convex shape. The area fraction of the surface is also selected to provide the desired superoleophobic properties. Also disclosed herein is a process for creating the modified surface comprising photolithography, optionally followed by vapor deposition. The substrates may be formed into useful articles or applied to pre-formed articles.
B81B 1/00 - Devices without movable or flexible elements, e.g. microcapillary devices
G03F 7/00 - Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printed surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
B81C 1/00 - Manufacture or treatment of devices or systems in or on a substrate
This invention relates to elastomeric coatings for electronics. Disclosed is a electronic device comprising a substrate layer, a conductive layer and an encapsulant layer. The encapsulant layer comprises at least a butyl rubber material. The butyl rubber encapsulant prevents a change in resistivity of the conductive layer following exposure to nitric acid vapour for 12 hours or hydrochloric acid vapour for 10 hours.
B32B 25/18 - Layered products essentially comprising natural or synthetic rubber comprising butyl or halobutyl rubber
B32B 33/00 - Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
patents
