Patent ID: 9683067
Date: 2017-06-20
CPC Classifications: B01J,B60C,C08C,C08F,C08K

Claim:
1. A method of production of a nitrile group-containing copolymer rubber, wherein the nitrile group-containing copolymer rubber has a carboxyl group at an end carbon atom or a carbon atom which is bonded with the end carbon atom or the nitrile group-containing copolymer rubber has carbon-carbon double bond at an end carbon atom or a carbon atom which is bonded with the end carbon atom, the method comprising: causing a metathesis reaction of a raw nitrile group-containing copolymer rubber in the presence of a chain transfer agent which has at least one double bond and at least one carboxyl group or in the presence of a chain transfer agent which has two or more double bonds to form the nitrile group-containing copolymer rubber.