Vulcanizable compositions of halogen and carboxyl containing acrylate elastomers, 2,5-dimercapto-1,3,4-thiadiazole, a Group IVA metal oxide or salt and a tetraalkyl thiuram sulfide

Claim 1

A composition comprising (1) an acrylate rubber containing (a) from about 65 percent to about 98 percent by weight of an acrylate of the formula ##STR4## wherein R is selected from the group consisting of an alkyl radical containing 1 to 10 carbon atoms and an alkoxyalkyl radical containing 2 to about 8 carbon atoms, (b) from about 0.2 percent to about 15 percent by weight of a halogen-containing monomer selected from the group consisting of halogen-containing vinylidene hydrocarbons and halogen-containing vinyl monomers having the halogen group at least two carbon atoms removed from an oxygen atom, (c) from about 0.2 percent to about 10 percent by weight of an unsaturated carboxyl-containing monomer, and (d) up to about 10 percent by weight of a copolymerizable monomer containing a terminal vinylidene group, and (2) a curative consisting essentially of about 0.4 to about 2.0 weight parts of 2,5-dimercapto-1,3,4-thiadiazole, about 0.5 to about 1.5 weight part of a fatty acid salt of lead or tin and about 1.5 to 3.5 weight parts of tetralkyl thiuram disulfide wherein the alkyl groups contain 1 to 6 carbon atoms, all weights based on 100 weight parts of acrylate rubber.