Patent ID: 7902289

Claim:
A rubber composition for coating a belt layer steel cord comprising: (A) 2.5 to 3.75 parts by weight of elemental sulfur, (B) 0.5 to 5 parts by weight of resorcin or modified resorcin condensate, (C) 0.3 to 3 parts by weight of partial condensate of hexamethylol melamine pentamethyl ether or partial condensate of hexamethoxymethylol melamine, and (D) cobalt salt of organic acid, based on 100 parts by weight of a rubber component consisting of 100% by weight of a natural rubber and/or an isoprene rubber; wherein the cobalt content in said cobalt salt of organic acid (D) is 0.05 to 0.8 parts by weight based on 100 parts by weight of said rubber component, and wherein said rubber composition does not contain silica.