Abstract: Provided is a silicone-containing polyurethane resin composition including: an isocyanate group-terminated, NCO-terminated modified silicone prepolymer obtained by allowing a first polyisocyanate to undergo reaction with a modified silicone containing at least one hydroxyl group at a terminal; a silicone oil; and an isocyanate group-terminated, NCO-terminated urethane prepolymer obtained by allowing a second polyisocyanate to undergo reaction with polyol, wherein reactivity of the first polyisocyanate with a curing agent is higher than reactivity of the second polyisocyanate with a curing agent.

Abstract: An object of the present invention is to improve the abrasion resistance of a golf ball that uses a polyurethane as a resin component for a cover. Another object of the present invention is to improve the shot feeling of a golf ball that uses a polyurethane as a resin component for a cover. The present invention provides a golf ball comprising a core; and a cover covering the core, wherein the cover contains a polyurethane elastomer as a resin component, and the polyurethane elastomer contains a polyol component and a polyisocyanate component and does not contain a chain extender.

Abstract: An object of the present invention is to improve the abrasion resistance of a golf ball that uses a polyurethane as a resin component for a cover. Another object of the present invention is to improve the shot feeling of a golf ball that uses a polyurethane as a resin component for a cover. The present invention provides a golf ball comprising a core; and a cover covering the core, wherein the cover contains a polyurethane elastomer as a resin component, and the polyurethane elastomer contains a polyol component and a polyisocyanate component and does not contain a chain extender.

Abstract: Disclosed is a polyether polyurethane comprising (A) at least one polyisocyanate having two or more isocyanate groups, which is selected from the group consisting of an aromatic polyisocyanate and an aliphatic polyisocyanate; (B) a polyoxytetramethylene glycol (PTMG) having a number average molecular weight of from 500 to 4,000, a molecular weight distribution (Mw/Mn) of 1.75 or less, and a content of high molecular weight PTMG molecules of 10% by weight or less; and (C) at least one chain extender selected from the group consisting of a C2-C10 polyol having two or more hydroxyl groups and a C2-C10 polyamine having two or more amino groups. Also disclosed is a urethane prepolymer which comprises the above-mentioned components (A) and (B) and which has terminal isocyanate groups.