Patent ID: 7514505

Claim:
A golf ball material comprising: (A) a metal ionic species in a form of (A1) ultrafine particles of an oxygen-containing inorganic metal compound having an average size of 0.005 to 0.1 μm and a particle size distribution of 0.001 to 1.0 μm in diameter, (B) at least one polymer selected from the group consisting of diene polymers, thermoplastic polymers and thermoset polymers, and (C) at least one acid-containing polymer having an acid content of 0.5 to 30% by weight and selected from the group consisting of olefin-unsaturated carboxylic acid copolymers, olefin-unsaturated carboxylic acid-unsaturated carboxylic acid ester terpolymers, and polymers containing one or more monomer selected from the group consisting of unsaturated carboxylic anhydrides, unsaturated dicarboxylic acids and half esters thereof, the component (C) being un-neutralized; which is obtained by blending and melt-mixing component B and component C to form a molten polymer composition of components B and C, then blending component A into the molten polymer composition in which at least some of the acid groups present in components B and C of the polymer composition are neutralized.