Vulcanizates of EPDM and diene rubber blends
AssigneeThe B. F. Goodrich Company
InventorsRay D. Taylor, Robert A. Krueger
Life of this patent
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Abstract
Polymer blends of ethylene-higher .alpha.-olefin-polyene (EPDM) polymers with highly unsaturated diene rubbers are cured using sulfur and a N,N-(higher alkyl) thiocarbamylsulfenamide as a vulcanization accelerator. The vulcanizates exhibit improved tensile strength, flex-heat build-up, and oil swell properties.
Claims14
A vulcanizable composition comprising (1) from about 1% to about 99% by weight of the polymer blend of an ethylene-higher .alpha.-olefin-polyene polymer, (2) from about 1% to about 99% by weight of the polymer blend of a highly unsaturated rubber, having an olefinic content from about 20% to about 45% by weight based upon the total weight of the polymer (3) as the vulcanizing agent, sulfur or a sulfur donor used at a level of from about 0.5 to 10 parts by weight based upon 100 parts by weight of the polymer blend, and (4) as the vulcanization accelerator used at a level from about 0.1 to about 10 parts by weight based upon 100 parts by weight of the polymer blend, a thiocarbamylsulfenamide of the formula ##STR7## where B is selected from the group consisting of ##STR8## wherein R.sub.1 and R.sub.2 are selected from the group consisting of alkyl radicals containing 1 to about 4 carbon atoms and cycloalkyl radicals containing 4 to 7 carbon atoms in the ring;
- R is hydrogen or an alkyl radical containing 1 to 2 carbon atoms;
- x is 4 to 7;
- and R.sub.a and R.sub.b are alkyl radicals containing 6 to about 30 carbon atoms.
Dependencies are inferred from the claim text.