E.i. Dupont De Nemours and Company

Yun-Tai Wu

Mark Aaron Stewart

Francis M Logullo

Yi Ye

George Elias Zahr

Edward Francis McBride

David John Mitchell

Disclosed are copolymers derived from copolymerization of from about 50 to about 70 weight % of methyl acrylate; from about 0.5 to about 5 weight % of 1,4-butene-dioic acid moieties, or anhydrides or monoalkyl esters thereof; the remainder being ethylene, wherein the copolymer has a number average molecular weight from about 40,000 to about 65,000 and a melt index from about 1 to about 6 g/10 minutes. Also disclosed are compounded compositions comprising these copolymers, and cured compositions (i.e., vulcanizates) as well as rubber articles formed from these compounded compositions, such as hoses, dampers, boots, seals, and gaskets for automotive and nonautomotive applications. Blends of other polymers with these copolymers are also disclosed.

Ethylene/methyl acrylate/cure site copolymers and compounds and vulcanizates thereof

Disclosed are copolymers derived from ethylene and an alkyl acrylate comonomer wherein the copolymer has a number average molecular weight (M) above 40,000. This invention also provides compounded compositions and cured compositions (i.e., vulcanizates) comprising these copolymers. The copolymers provide improved dynamic fatigue resistance of the vulcanizates. Also disclosed are articles comprising the copolymers, such as tubing, hoses, dampers, seals and gaskets.

Ethylene/alkyl acrylate copolymers and compounds, vulcanizates and articles thereof

Disclosed are copolymers derived from ethylene and at least two different alkyl acrylate comonomers, with or without an acid cure site-containing comonomer. The copolymers can be derived from (a) from 10 to 50 weight % of ethylene; (b) 20 to 30 weight % of a first alkyl acrylate having from 1 to 4 carbons in the alkyl group; from 35 to 45 weight % of a second different alkyl acrylate having from 1 to 4 carbons in the alkyl group; and (d) from 0 to 5 weight % of a 1,4-butene-dioic acid moiety, or anhydride or monoalkyl ester thereof; the remainder being ethylene: wherein the copolymer has a number average molecular weight (M) above 40,000. Also disclosed are compounded compositions comprising these copolymers and cured compositions (i.e., vulcanizates) as well as rubber articles formed from these compounded compositions, such as constant velocity joint boots and shaft boots, hoses, dampers, seals and gaskets. These copolymers provide improved dynamic fatigue resistance of cured compounds while maintaining an expanded operating temperature range and oil resistance. Blends of other polymers with these copolymers are also disclosed.

Ethylene/alkyl acrylate copolymers, compounds and vulcanizates thereof

Disclosed are random copolymers derived from ethylene and at least two different alkyl acrylate comonomers, with or without an acid cure site-containing comonomer. In particular, disclosed are copolymers derived from copolymerization of (a) from 10 to 50 weight % of ethylene; (b) from 5 to 55 weight % of a first alkyl acrylate; (b) from 15 to 80 weight % of a second alkyl acrylate; and (d) from 0 to 7 weight % of a monoalkyl ester of 1,4-butene-dioic acid. Such copolymers exhibit lower glass transition temperatures (Tg) relative to previous ethylene copolymers comprising a single alkyl acrylate comonomer and maintain the good heat and fluid resistance when employed to produce cured elastomeric compositions as well as the improved low temperature properties. This invention also provides compounded compositions comprising these copolymers, and cured compositions (i.e., vulcanizates) as well as rubber articles formed from these compounded compositions, such as hoses, dampers, seals, gaskets, constant velocity joint (CVJ) boots and shaft boots.

Random ethylene/alkyl acrylate copolymers, compounds and elastomeric compositions thereof with improved low temperature properties

A filament-wound pressure vessel constructed of a rigid composite of an epoxy resin matrix reinforced with continuous filaments of a p-aramid coated with an adhesion modifier.

Filament-wound pressure vessel

A rigid composite of an epoxy resin matrix reinforced with continuous filaments of a p-aramid coated with an adhesion modifier.

Composites

Coating of aramid filaments with certain polyfunctional aziridines increases interlaminar shear strength of unsaturated polyester matrix composites.

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Bryn Mawr, PA, United States of America

Yun-Tai Wu