Abstract: This invention relates to an elastomeric composition comprising at least one elastomer and a hydrocarbon polymer additive, wherein the hydrocarbon polymer additive has a glass transition temperature in the range of about 40 to about 70° C. and is selected from at least one of dicyclopentadiene (DCPD)-based polymer, a cyclopentadiene (CPD)-based polymer, a DCPD-styrene copolymer, a C5 homopolymer and copolymer resin, a C5-styrene copolymer resin, a terpene homopolymer or copolymer resin, a pinene homopolymer or copolymer resin, a C9 homopolymer and copolymer resin, a C5/C9 copolymer resin, an alpha-methyl styrene homopolymer or copolymer resin, and combinations thereof; and wherein, the composition has a permeability coefficient at 40° C. of 1 cc*mm/(m2-day)*mmHg or less.

Abstract: Elastomeric polymers and compounded elastomers having reduced amounts of leachables and improved resistance to ?-irradiation sterilization suitable for pharmaceutical stopper and seal applications. These polymers and compounded elastomers maintain their physical performances upon being exposed to ?-irradiation over time and typical use conditions. The polymer is prepared by reacting a mixture of i) a C4 to C7 isoolefin monomer, ii) a styrene based monomer, and optionally iii) a C4 to C14 multiolefin monomer wherein the polymer contains 5 to 15 wt % of styrene derived units.

Abstract: Disclosed is an ethylene-propylene copolymer having isotactic polypropylene crystallinity compounded with a halobutyl rubber in an amount effective to improve one or more of aged tensile strength retention, fatigue resistance, and dimensional stability. Also disclosed is an elastomer composition wherein the copolymer can have at least 60 wt % propylene-derived units and at least 6 wt % ethylene-derived units, and a tire inner tube or tire innerliner composition comprising from 1 to 10 phr copolymer. Also disclosed is a vulcanizate of the elastomer composition, and articles, tire innerliners, tires, and tire inner tubes comprising the vulcanizate. Further disclosed are processes for making molded articles, tire inner tubes and tires.

Abstract: Disclosed is an ethylene-propylene copolymer having isotactic polypropylene crystallinity compounded with a halobutyl rubber in an amount effective to improve one or more of aged tensile strength retention, fatigue resistance, and dimensional stability. Also disclosed is an elastomer composition wherein the copolymer can have at least 60 wt % propylene-derived units and at least 6 wt % ethylene-derived units, and a tire inner tube or tire innerliner composition comprising from 1 to 10 phr copolymer. Also disclosed is a vulcanizate of the elastomer composition, and articles, tire innerliners, tires, and tire inner tubes comprising the vulcanizate. Further disclosed are processes for making molded articles, tire inner tubes and tires.

Abstract: Elastomeric polymers and compounded elastomers having reduced amounts of leachables and improved resistance to ?-irradiation sterilization suitable for pharmaceutical stopper and seal applications. These polymers and compounded elastomers maintain their physical performances upon being exposed to ?-irradiation over time and typical use conditions. The polymer is prepared by reacting a mixture of i) a C4 to C7 isoolefin monomer, ii) a styrene based monomer, and optionally iii) a C4 to C14 multiolefin monomer wherein the polymer contains 5 to 15 wt % of styrene derived units.