Sulfur vulcanizable interpolymers

An alternating sulfur vulcanizable elastomeric interpolymer having a glass transition temperature of less than 0.degree. C, an inherent viscosity greater than 0.5 when measured in benzene at a temperature of 20.degree. C and concentration of 0.1 g/dl, and a number average molecular weight in the range of about 10,000 to 700,000 comprising:

• A. one or more C.sub.2 -C.sub.20 acyclic or alicyclic olefins having the general formula ##STR4## wherein R and R' are independently selected from the group consisting of chloride, hydrogen, straight and branched chain alkyl radicals, aryl, alkylaryl, arylalkyl and cycloalkyl radicals;
• B. one or more C.sub.1 -C.sub.20 acyclic or alicyclic esters of acrylic acid, said esters having the general formula
• CH.sub.2 .dbd. CH -- COOR
• wherein R is selected from the group consisting of straight or branched chain primary alkyl radicals, arylalkyl radicals and cycloalkyl alkylene radicals, and is free of olefinic unsaturation;
• and
• c. a minor molar proportion, about 0.10 to 10 mol percent of the total monomers present in said interpolymer, of one or more C.sub.4-C.sub.10 hydrocarbon acyclic conjugated diolefins, wherein the mol percent of the esters of acrylic acid and the sum of the mol percentages of the olefin and diolefin present in said interpolymer are each substantially equal to 50 mol percent, and wherein olefin monomer units of (A) above and acrylate monomer units of (B) above alternate to form polymer segments of variable length, interconnected by randomly distributed diolefin monomer units of (C) above and the microstructure of said interpolymer can be represented by
• (A -- B).sub.n (C) (B) (A -- B).sub.n
• wherein n is an integer from 1 to 500.