Abstract: The present invention is directed to a peroxide curable rubber compound containing a butyl rubber polymer, an olefin polymer of ethylene, at least one ?-olefin and optionally at least one diene, and a high vinyl polybutadiene polymer. The present invention is also directed to a peroxide curable rubber compound containing a butyl polymer, an EP(D)M rubber polymer, and a 1,2-polybutadiene polymer.

Abstract: A polymerization process for preparing a silica-filled butyl rubber polymer. A quaternary onium ion substituted silaceous nanoclay is dispersed in the organic polymerization fluid prior to polymerization of an isoolefin monomer and a multiolefin monomer in the fluid. The resulting silica-filled polymer comprises butyl rubber intercalated with silica from the silaceous nanoclay. The rate of polymerization is substantially unaffected by addition of the nanoclay to the polymerization fluid. The resulting silica-filled polymers exhibit improved impermeability as compared with non-filled polymers.

Abstract: The present invention relates to a peroxide curable rubber nanocomposite compound comprising a peroxide curative, a nanoclay and a high multiolefin halobutyl ionomer prepared by reacting a halogenated butyl polymer having a high mol percent of multiolefin with at least one nitrogen and/or phosphorus based nucleophile. The resulting high multiolefin halobutyl ionomer comprises from about 2 to 10 mol % multiolefin. The present invention is also directed to a shaped article comprising the rubber compound.

Abstract: The present invention is directed to a peroxide curable rubber compound containing a butyl rubber polymer, an olefin polymer of ethylene, at least one ?-olefin and optionally at least one diene, and a high vinyl polybutadiene polymer. The present invention is also directed to a peroxide curable rubber compound containing a butyl polymer, an EP(D)M rubber polymer, and a 1,2-polybutadiene polymer.

Abstract: An adhesive polymer comprising a maleic anhydride grafted butyl rubber and a polymer compound made from the adhesive polymer further comprising a functionalized siliceous nanoclay. The adhesive polymer and polymer compound exhibit greatly improved adhesion to certain substrate surfaces. Examples of substrate materials include stainless steel, glass, mylar or Teflon®. The greatest adhesion was observed in polymer compounds comprising maleic anhydride grafted butyl rubber produced according to a solution process and from 5 to 15 phr of a montmorillonite nanoclay. The adhesion is improved with increasing levels of nanoclay content in the compound up to a limit where filler-filler interactions occur.

Abstract: The present invention is directed to a peroxide curable rubber compound containing a butyl rubber polymer and an olefin polymer of ethylene and at least one ?-olefin. The present invention is also directed to a peroxide curable rubber compound containing a butyl polymer and an EP(D)M rubber polymer.

Abstract: The present invention relates to an elastomeric polymer having repeating units derived from at least one isomonoolefin monomer, at least one multiolefin monomer, at least one diisoalkenylbenzene monomer, and optionally further copolymerizable monomers, wherein the polymer has a Mooney viscosity (ML 1+8@125° C. according to ASTM D1646) of less than 40 units and a Shore A hardness higher than 65 points @ 23° C. (according to ASTM D2240) as well as a curable composition containing the elastomeric polymer and a shaped article manufactured from the curable composition.

Abstract: The present invention is directed to a peroxide curable rubber compound containing a butyl rubber polymer, an olefin polymer of ethylene, at least one alpha-olefin and optionally at least one diene, and a non-polymeric multi-unsaturated peroxide curable compound. The present invention is also directed to a peroxide curable rubber compound containing a butyl polymer, an EPDM rubber polymer and divinylbenzene or di- or tri-(meth)acrylate. Also the present invention is directed to a process for preparing a peroxide curable rubber compound by mixing a butyl rubber polymer, a polymer of ethylene, at least one ?-olefin and optionally, at least one diene and non-polymeric multi-unsaturated peroxide curable cure modifier in the presence of a peroxide curing agent.

Abstract: The present invention relates to a shaped article containing at least one peroxide curable compound containing a butyl-like polymer(s) without any conjugated aliphatic diene in its composition, said polymer containing less than 15 wt. % of solid matter insoluble in boiling cyclohexane under reflux for 60 min. The present invention also relates to a sealing material and a medical device containing at least one peroxide-curable compound containing a butyl-like polymer containing less than 15 wt. % of solid matter insoluble in boiling cyclohexane under reflux for 60 min. Further, the present invention relates to a process for producing a butyl-like polymer having no conjugated aliphatic diene in its composition and containing less than 15 wt. % of solid matter insoluble in boiling cyclohexane under reflux for 60 min.

Abstract: The present invention is directed to a peroxide curable rubber compound containing a butyl rubber polymer and an olefin polymer of ethylene and at least one ?-olefin. The present invention is also directed to a peroxide curable rubber compound containing a butyl polymer and an EP(D)M rubber polymer.

Abstract: The present invention relates to an elastomeric polymer having repeating units derived from at least one isomonoolefin monomer, at least one multiolefin monomer, at least one diisoalkenylbenzene monomer, and optionally further copolymerizable monomers, wherein the polymer has a Mooney viscosity (ML 1+8@125° C. according to ASTM D1646) of less than 40 units and a Shore A hardness higher than 65 points @ 23° C. (according to ASTM D2240) as well as a curable composition containing the elastomeric polymer and a shaped article manufactured from the curable composition.

Abstract: The present invention relates to a method of improving reversion resistance of a peroxide curable polymer containing at least one polymer having repeating units derived from at least one isomonoolefin monomer and at least one aromatic divinyl monomer by polymerizing the monomers in the presence of at least one m- or p-diisoalkenylbenzene compound.

Abstract: The present invention relates to a shaped article containing at least one peroxide curable compound containing a butyl-like polymer(s) without any conjugated aliphatic diene in its composition, said polymer containing less than 15 wt. % of solid matter insoluble in boiling cyclohexane under reflux for 60 min. The present invention also relates to a sealing material and a medical device containing at least one peroxide-curable compound containing a butyl-like polymer containing less than 15 wt. % of solid matter insoluble in boiling cyclohexane under reflux for 60 min. Further, the present invention relates to a process for producing a butyl-like polymer having no conjugated aliphatic diene in its composition and containing less than 15 wt. % of solid matter insoluble in boiling cyclohexane under reflux for 60 min.

Abstract: The present invention relates to a process for preparing a diene polymer having a trans content of from about 10 to about 30% by the polymerization of a diene monomer in the presence of a two-component catalyst system comprising a rare-earth metal catalyst and a Lewis acid co-catalyst.

Abstract: This invention relates to a method for the suspension polymerization of conjugated dienes in hydrocarbon mixtures comprising a fraction by volume greater than 80% of C4 hydrocarbons wherein polymerization is conducted in the presence of a rare earth compound, of one or more aluminum compounds, and optionally of an additional Lewis acid. The invention further relates to the polymers which can be produced according to the present invention and to the use thereof for the production of moldings of all types, particularly tires and industrial rubber products, and for blending with polystyrene (HIPS).

Abstract: A process is provided for the halomethylation of the aromatic groups in an isoolefin-vinylidene aromatic monomer polymer by the in situ generation of the halomethylating species formed by the reaction of a methoxy alkoxy methane with a thionyl halide, the halomethylation of the polymer being catalyzed by a Lewis acid.

Abstract: A halogenated butyl rubber is prepared by a process wherein a monomer charge comprising isobutylene and conjugated diolefin having the formula ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 which may be the same or different are a methyl group or a hydrogen atom and X is bromine or chlorine together with an initiator having the formula ##STR2## wherein each R.sub.4 is an alkyl, aryl or aralkyl group, Y is preferably an alkoxy, hydroxy, carboxyl or halide, and n is a positive whole number from 1 to 3 are introduced into a suitable reaction vessel in a specified ratio at a temperature of from about -90.degree. to -10.degree. C., a solution of a Lewis acid is added and the monomers are copolymerized at said temperature to form said halogenated butyl rubber, and the halogenated rubber is recovered from solution.

Abstract: A process for producing EP and EPDM polymers with a reduction in fouling is provided, which process comprises polyemrizing ethylene, an alpha-olefin and a nonconjugated diolefin (if utilized) in a polymerization medium comprising a hydrocarbon diluent at a temperature of from about -50.degree. C. to about 150.degree. C. in the presence of a catalyst system comprising (a) a vanadium compound, (b) diethyl aluminum chloride, ethyl aluminum sesquichloride or ethyl aluminum dichloride and (c) an organo aluminum compound of the formula R.sub.3 Al wherein R is an alkyl group having from 8 to 12 carbon atoms and, optionally, triethyl aluminum, the molar ratio of chloride in diethyl aluminum chloride to the total aluminum content in (b) and (c) being from about 0.7:1 to about 0.95:1, the molar ratio of the chloride in ethyl aluminum sesquichloride to the total aluminum content in (b) and (c) being from about 0.7:1 to about 1.

Abstract: A process for producing high cis-1,4-polybutadienes using a catalyst system based on a rare earth compound that exhibits improved catalytic activity is provided which process comprises polymerizing 1,3-butadiene in a polymerization medium comprising a hydrocarbon solvent at a temperature of from about 0.degree. C. to about 120.degree. C. in the presence of a catalyst system which is a mixture of (1) a rare earth carboxylate selected from the group of neodymium carboxylates wherein the carboxylate has from 4 to 12 carbon atoms, (2) an alkyl aluminum chloride selected from the group of compounds represented by the formulae R.sup.2 AlCl.sub.2, R.sup.2.sub.3 Al.sub.2 Cl.sub.3 and R.sup.2.sub.2 AlCl wherein R.sup.2 is a hydrocarbon residue having from 8 to 12 carbon atoms and (3) an organo aluminum compound of the formula R.sup.3.sub.2 AlH wherein R.sup.

Abstract: There is provided a process for the preparation of a high cis-1,4-polybutadiene with a reduced microgel content wherein a novel catalyst system consisting of (1) a nickel salt of a carboxylic acid, (2) a mixture of triethyl aluminum and an organoaluminum compound having the formula R.sub.3 Al, said mixture having an average composition Et.sub.3-x R.sub.x Al wherein Et is an ethyl group, x is a numeral from 0.1 to 2.9 and R is an alkyl group having 8 to 12 carbon atoms, and (3) a boron trifluoride etherate is used to polymerize 1,3-butadiene in an inert hydrocarbon.