MULTI-LAYER GOLF BALL

摘要

A golf ball has an ionomer resin core center, a cured rubber layer made from (a) an at least 70% cis-1,4 polybutadiene with Mooney viscosity (ML1+4(100° C.))≧40, (b) an unsaturated carboxylic acid or metal salt, and (c) a free radical initiator; and a cover including a thermoplastic material. The core center has a diameter of 21-29 mm and a 10-130 kg compression deformation (C) ≧4 mm. The core layer is ≧5 mm thick with a specific gravity ≧0.1 g/cm3 greater than that of the core center. The cover may have a flexural modulus ≧15,000 psi or ≦35,000 psi. Also disclosed is a golf ball with an ionomer core center having C1 ≧3.5 mm, a cured rubber core layer ≧5 mm thick with C2 ≧3 mm, and a cover with C3 ≧2.8 mm, with C2/C1 and C3/C2 about 0.8-1.

主权项

1. A golf ball, comprising:
a core center with a diameter of from about 21 mm to about 29 mm, a 10-130 kg compression deformation of at least about 4 mm, and comprising an ionomer resin and a polyolefin elastomer; a core layer disposed radially outward from the core center, wherein the core layer has a thickness of at least about 5 mm and comprises a cured product of a rubber composition comprising a polybutadiene, an unsaturated carboxylic acid or metal salt of an unsaturated carboxylic acid, and a free radical initiator, wherein the polybutadiene has a Mooney viscosity (ML1+4(100° C.)) of at least about 40 and has at least about 70% cis-1,4 bonds; a cover comprising a thermoplastic material having a flexural modulus of at least about 15,000 psi; wherein the specific gravity of the core layer is at least about 0.1 g/cm3 greater than the specific gravity of the core center.