Thiocarbamate additives for sulfur vulcanizable polymers

Claim 1

A sulfur vulcanizable diene polymer selected from the group consisting of natural rubber and synthetic diene polymers prepared from a monomer system containing diene monomer, said sulfur vulcanizable diene polymer having incorporated therein at least one thiocarbamate having the following structural formula ##STR4## wherein R is selected from the group consisting of alkyl radicals having 1 to 20 carbon atoms, monochloroalkyl radicals having 3 to 20 carbon atoms, cycloalkyl radicals having 5 to 10 carbon atoms, monochlorocycloalkyl radicals having 5 to 10 carbon atoms, aralkyl radicals having 7 to 11 carbon atoms and aryl radicals having 6 to 10 carbon atoms, said aryl radicals optionally substituted with 1 or 2 radicals selected from the group consisting of alkyl radicals having 1 to 4 carbon atoms and the chloro radical, wherein the symbol ##STR5## denotes a heterocyclic amino radical selected from the group consisting of pyrrolidino, piperidino, hexamethyleneimino, morpholino, 2,6-dimethylmorpholino, 2-methylpiperidino, 3-methylpiperidino, 4-methylpiperidino, 2,6-dimethylpiperidino, and 4-methylpiperazino, R 2 is selected from the group consisting of alkylene radicals conforming to the following structural formula --(C.sub.m H.sub.2m) -- (R.sup.6).sub.X -- (C.sub.n H.sub.2n) -- and arylene radicals having 6 to 10 carbon atoms, wherein X is 0 or 1, wherein R 6 is selected from the group consisting of --0--, --S-- and phenylene, wherein when R 6 is phenylene or X is 0, m and n are positive whole numbers from 1 to 5 and wherein when R 6 is --0-- or --S--, m and n are positive whole numbers from 2 to 5; R 3 and R 4 are selected from the group consisting of alkyl radicals having 1 to 20 carbon atoms, cyclohexyl radical; aralkyl radicals having 7 to 12 carbon atoms and aryl radicals having 6 to 10 carbon atoms; R 5 is selected from the group consisting of alkylene radicals having 2 to 6 carbon atoms and p-phenylene and wherein R 3 and R 4 can be joined to constitute with the bridging R 5 group and the attached nitrogen atoms, a heterocyclic diamino radical selected from the group consisting of piperazino, 2,5-dimethylpiperazino, homopiperazino, and 4,4'-trimethylenediperidino.