Patent ID: 7842216

Claim:
A method of the production of a golf ball which comprises: reinforcing layer formation step in which a reinforcing layer comprising a thermosetting resin composition is formed on the surface of a core having a mantle layer comprising a thermoplastic resin composition on the outer side thereof to obtain a spherical body; placing step in which two pieces of a substantially semi-spherical half shell comprising another thermoplastic resin composition, and said spherical body covered by said half shells are placed into a mold having upper and lower mold half each having a hemispherical cavity in the state of said mold open; clamping step in which said mold is clamped at a velocity of 0.01 mm/sec or greater and 1.0 mm/sec or less whereby the thermoplastic resin composition of the half shell being heated while being compressed in the spherical cavity, accompanied by outflow of excess thermoplastic resin composition from the spherical cavity; and hardening step in which the thermoplastic resin composition of said half shell is hardened to give a cover having a thickness of 0.1 mm or greater and less than 0.7 mm, with the difference (T−Fc) between the molding temperature T and the incipient fluidization temperature Fc of the thermoplastic resin composition of the cover being 0° C. or greater and 25° C. or less.