Patent ID: 8450419

Claim:
A method for preparing a golf ball material comprising the following components (A), (B), and (C): (A) a mixture of different masterbatches prepared by separately masterbatching two or more different metal ions (A1) or a masterbatch prepared by simultaneously masterbatching two or more different metal ions (A2), (B) one or more polymer selected from the group consisting of diene polymers, thermoplastic polymers and thermoset polymers, and (C) one or more polymer having an acid content of from about 0.5 to about 30 wt % and selected from the group consisting of olefin-unsaturated carboxylic acid copolymers, olefin-unsaturated carboxylic acid-unsaturated carboxylic acid ester terpolymers, unsaturated carboxylic anhydride-containing polymers, unsaturated dicarboxylic acid-containing polymers and unsaturated dicarboxylic acid half ester-containing polymers, and further comprising, in admixture with components A, B and C, a norbornene dicarboxylic anhydride and/or a derivative thereof and a peroxide, the method being comprised of melt-mixing components B, C, the norbornene dicarboxylic anhydride and/or a derivative thereof and the peroxide to form a polymer composition, then mixing component A into the polymer composition so as to carry out in a single-step reaction (one-pass extrusion) which neutralizes the acid groups in the acid-containing polymer.