Vulcanizable compositions of a halogen-containing polymer and a diene-nitrile rubber having active halogen cure sites

A vulcanizable composition comprising (A) a polymer blend of (1) from about 1 part to about 99 parts by weight of a diene/nitrile rubber having a halogen content of from about 0.2 percent to about 5 percent by weight based on the polymer and comprised of interpolymerized units of from 50 percent to about 98 percent by weight of a non-halogen containing conjugated diene monomer having from 4 to about 10 carbon atoms, from about 1 percent to about 49 percent by weight of a non-halogen containing monoolefinically unsaturated nitrile monomer having 3 to about 6 carbon atoms, and from about 0.5 percent to about 20 percent by weight of a halogen-containing monomer have a Q value of from about 0.1 to about 6 and selected from the group consisting of halogen-bearing vinylidene hydrocarbons, halogen-containing acrylates, and halogen-containing vinyl ketones, and (2) from about 1 part to about 99 parts by weight of a halogen-containing polymer selected from the group consisting of halogen-containing acrylate rubbers, halogen-containing diene rubbers, epihalohydrin polymers, and polyfluorocarbons, and (B) a cure system for the polymer blend consisting essentially of from about 0.1 part to about 7 parts by weight of curative ingredients for the halogen-containing polymer of (A) (2) above, all parts by weight based upon 100 parts by weight of the polymer blend.