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US 6,720,390 B2Granted
Process for crosslinking of acrylic ester copolymers
AssigneeE. I. Du Pont de Nemours and Company
InventorsGordon Mark Cohen, Jerald Rice Harrell, Edward Johson Deyrup
Life of this patent
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Abstract
Disclosed is a process for crosslinking copolymers of acrylic esters by converting some of the ester groups to ester or amide groups which contain unsaturation, and then sulfur or peroxide curing the resulting polymers. The resulting crosslinked polymers often have excellent vulcanizate properties, and are useful especially in elastomeric form as seals and gasket.
Claims25
A process for crosslinking a polymer, comprising:
- (a) transesterifying or amidating a first polymer consisting essentially of about 60 or more mole percent of
- and up to about 40 mole percent of one or more comonomers selected from the group consisting of aromatic hydrocarbon olefins, acrylonitrile, olefinic monomers containing one or more functional groups selected from the group consisting of chlorine, epoxy, and carboxylic acid, and cyanoalkyl acrylates wherein alkyl comprises 2-8 carbons, with an alcohol or a primary amine which contains one or more olefinic bonds, to form a second polymer having side chains containing said olefinic bonds;
- and
- (b) crosslinking said second polymer using a sulfur or peroxide cure system;
- and wherein:
- R1 is methyl or hydrogen;
- and
- R2 is hydrocarbyl, substituted hydrocarbyl, or a mixture thereof.
5 more elements
A composition comprising:
- (a) a second polymer made by transesterifying or amidating a first polymer consisting essentially of about 60 or more mole percent of
- and up to about 40 mole percent of one or more comonomers selected from the group consisting of aromatic hydrocarbon olefins, acrylonitrile, olefinic monomers containing one or more functional groups selected from the group consisting of chlorine, epoxy, and carboxylic acid, and cyanoalkyl acrylates wherein alkyl comprises 2-8 carbons, with an alcohol or a primary amine which contains one or more olefinic bonds;
- and
- (b) a sulfur or peroxide cure system;
- and wherein:
- R1 is methyl or hydrogen;
- and
- R2 is hydrocarbyl and/or substituted hydrocarbyl.
5 more elements
A composition comprising:
- (a) a polymer consisting essentially of at least 60 mole percent of
- and up to about 40 mole percent of one or more comonomers selected from the group consisting of aromatic hydrocarbon olefins, acrylonitrile, olefinic monomers containing one or more functional groups selected from the group consisting of chlorine, epoxy, and carboxylic acid, and cyanoalkyl acrylates wherein alkyl comprises 2-8 carbons;
- and
- (b) a sulfur or peroxide cure system;
- wherein:
- R1 is methyl or hydrogen;
- and R2 is hydrocarbyl, substituted hydrocarbyl, or a mixture thereof, provided that at least 0.5 mole percent of R2 contains olefinic unsaturation.
4 more elements
Dependencies are inferred from the claim text.