Reaction product of olefinically-unsaturated nitrile and a monoolefinic hydrocarbon as plasticizer for conjugated diene-unsaturated nitrile rubber

DETAILED DESCRIPTION I claim: 1.
A conjugated diene-unsaturated nitrile rubber plasticized with at least one reaction product of an olefinically unsaturated nitrile, having the general formula (I) RCH.
dbd.
CR--CN and a monoolefinic hydrocarbon, containing an allylic hydrogen atom and represented by the formula (II) R' .
sub.
2 C.
dbd.
CR'CHR'--.
sub.
2, which have been thermally contacted to produce an unsaturated diadduct product having the formula ##STR3## wherein each R and each R' is independently selected from the group consisting of hydrogen and hydrocarbyl radicals, and an oligomer thereof, which can be represented by the formula ##STR4## wherein R and R' are as defined earlier and n is equal to an integer in the range 2 to 20.
2.
A composition according to claim 1 wherein R and R' are selected from the group consisting of alkyl, cycloalkyl, aryl hydrocarbyl radicals and combinations thereof.
3.
A composition according to claim 2 wherein the nitrile is at least one selected from the acrylonitrile, methacrylonitrile, 2-decenenitrile, 3-cyclohexyl-2-propenenitrile, 4-phenyl-2-butenenitrile, 3-(p-tolyl)-2-propenenitrile, 2-butenenitrile, 2-hexenenitrile, 5-methyl-2-hexenenitrile, 4-methyl-2-heptenenitrile, 6,6,8,8,-tetramethyl-2-nonenenitrile, 6-cyclohexyl-2-octenenitrile, 6-phenyl-2-decenenitrile, 2-octadecenenitrile, 6,7,8-trimethyl-9-phenyl-2-nonenenitrile, 5-p-tolyl-2-nonenenitrile.
4.
A composition according to claim 2 wherein in the olefinically unsaturated hydrocarbon is propylene, isobutylene, diisobutylene, 1,5-hexadiene, beta-pinene, 1,5-cyclooctadiene, 2,4,4-trimethyl-1-pentene, 2-butene, biallyl, bimethallyl, alpha-methyl-styrene, beta-methylstyrene, 1-pentene, 1-decene, cyclohexene, 1-allyl-cyclohexene, 3-allylcyclohexene, 4-allylcyclohexene, allylbenzene, 3,4,4-trimethyl-2-pentene, 1-dodecene, 2,3-dimethyl-2-butene, and 2-methyl-1-phenyl-2-propene.
5.
A composition according to claim 1 wherein the rubber is butadiene-acrylonitrile rubber and the plasticizer is at least one reaction product of isobutylene and acrylonitrile