Method of adhesion of rubber to reinforcing materials

A method for forming a strong adhesive bond between a vulcanized natural or synthetic rubber composition and a textile fiber or metal reinforcing member imbedded therein which comprises embedding a textile fiber or metal reinforcing member in a vulcanizable rubber composition consisting essentially of

• (A) natural or synthetic rubber, or a mixture thereof;
• (B) a vulcanizing agent;
• and
• (C) from about 1 to 10 parts by weight, per hundred parts by weight of rubber, of a compound selected from the group consisting of (1) compounds of the formula:
• ##STR9## wherein R and R' are individually lower (C.sub.1 -C.sub.4) alkyl, aryl (C.sub.6 -C.sub.10) or cycloalkyl having 5 or 6 carbon atoms in the ring;
• (2) compounds of the formula:
• ##STR10## wherein R.sup.2 and R.sup.3 are individually alkyl (C.sub.1 -C.sub.8), aryl (C.sub.6 -C.sub.10) cycloalkyl having 5 or 6 carbon atoms in the ring, cyano, carboxy, carboalkoxy, amido or dialkylamido substituted lower (C.sub.1 -C.sub.4) alkyl or hydroxy substituted lower (C.sub.2 -C.sub.4) alkyl;
• or (3) compounds of the formula:
• ##STR11## wherein R.sup.4 and R.sup.5 are, individually, hydrogen, lower (C.sub.1 -C.sub.4) alkyl, or cycloalkyl having 5 or 6 carbon atoms in the ring;
• n is an integer from 1 to 4 inclusive, and x is 1 or 2, and vulcanizing said composition.