Patent ID: 7381776

Claim:
A crosslinked rubber molding for golf balls obtained by spherically molding and crosslinking a rubber composition comprising a base rubber, a co-crosslinking agent and a crosslinking agent, then impregnating the crosslinked rubber molding with a rubber compounding chemical and inducing a chemical reaction, wherein the rubber compounding chemical is a polymerizable monomer and/or a crosslinking agent, wherein the rubber compounding chemical-impregnated crosslinked molding has (i) a higher surface hardness than the crosslinked molding prior to impregnation, (ii) a center hardness of from 30 to 80 in JIS-C hardness, and (iii) a surface hardness of from at least 75 in JIS-C to not more than 85 in Shore D, and wherein the rubber compounding chemical is allowed to penetrate from the surface of the crosslinked molding to a depth of at least 10 mm toward the center.