Composition and method of improving the green strength of unvulcanized reclaimed rubber

A process for producing elastomer blends having improved green strength, comprising,

• mixing a semi-crystalline butene polymer having a number average molecular weight of from about 30,000 to about 500,000 with an elastomer to produce the blend, the amount of said butene polymer ranging from about 2 to about 25 parts per 100 parts by weight of said elastomer, said butene polymer selected from the group consisting of polybutene and interpolymers made from 1-butene monomer and at least one monomer selected from the group consisting of alphaolefins having 2 through 16 carbon atoms;
• non-conjugated dienes having the general formula:
• ##STR8## where R.sub.1, R.sub.2, and R.sub.3 is a hydrogen, a lower alkyl group containing from one to four carbon atoms, or an aryl group;
• where R.sub.4 is an aryl group or a lower alkyl group containing from one to nine carbon atoms, and n is an integer having a value of from 1 to 6, and wherein the said R.sub.1 's in the ##STR9## group may be similar or dissimilar;
• and non-conjugated alpha, omega-polyenes having from 6 to 36 carbon atoms which may or may not contain internal unsaturation, wherein butene in said interpolymers comprises from 99.9 to 65 mole percent of the total monomers, and
• said elastomer being reclaimed rubber.