Patent ID: 7534834

Claim:
A multi-piece golf ball comprising a core, an intermediate layer formed of one or two sub-layers, and a cover, or comprising a core and a cover, wherein the cover is a layer formed of a composition consisting of polyurethane gel composite particles and at least one base material consisting of ionomer resin, polyurethane and butadiene rubber, the polyurethane gel composite particles consisting of colloidal polyurea particles precipitated from a non-aqueous solvent solution of colloidal polyurea and polyurethane gel particles covered with the polyurea particles, the polyurethane gel particles being three-dimensionally crosslinked and each of the polyurethane gel particles being formed of a polyisocyanate compound and a polyethylene oxide group-free, active-hydrogen-containing compound, at least one of the compounds being trifunctional or higher valency, and wherein the polyurethane gel composite particles are present in an amount of from 0.1 to 40 parts by weight per 100 parts by weight of the base material when the base material is ionomer resin or polyurethane, and the polyurethane gel composite particles are present in an amount of from 0.1 to 30 parts by weight per 100 parts by weight of the base material when the base material is butadiene rubber.