Solid golf ball
OwnerMasatoshi Yokotainventor
Life of this patent
Estimating the term…
Abstract
A solid golf ball with a polyurethane cover is provided which is satisfactory in the moldability of the cover and in ball characteristics such as a shot feeling and a flight distance. The solid golf ball of the invention includes a solid center, an intermediate layer, and a polyurethane cover. A material having a flexural modulus of from 150 to 420 MPa is used for the intermediate layer in order for the golf ball to offer satisfactory shot feeling and flight distance. By the use of a vulcanizate of a rubber composition containing a diphenyl disulfide for the solid center, the golf ball can exhibit an increased flight distance. In order to enhance the moldability of the cover a urethane prepolymer having a residual isocyanate monomer content of not more than 0.5% by mass is used.
Claims16
A solid golf ball comprising a solid center, an intermediate layer, and a polyurethane cover, wherein
- the solid center has an outer diameter of from 36.7 mm to 40.8 mm;
- the intermediate layer has a thickness of from 0.5 mm to 1.5 mm and is formed from a material having a flexural modulus of from 150 to 420 MPa;
- and
- the polyurethane cover has a thickness of from 0.5 mm to 1.5 mm and is formed from a cured product of a composition comprising an isocyanate group-terminated urethane prepolymer and an aromatic polyamine compound, the cured product having a Shore D hardness of from 35 to 55.
A solid golf ball comprising a solid center, an intermediate layer, and a polyurethane cover, wherein
- the solid center has an outer diameter of from 36.7 mm to 40.8 mm;
- the intermediate layer has a thickness of from 0.5 mm to 1.5 mm and is formed from an ionomer resin having a flexural modulus of from 150 MPa to 420 MPa;
- and
- the polyurethane cover has a thickness of from 0.5 mm to 1.5 mm and is formed by curing a polyurethane composition, the cured composition having a Shore D hardness of from 35 to 55, wherein
- the solid center is formed by vulcanizing a rubber composition which comprises cis-1,4-polybutadiene, an organic peroxide, a co-crosslinking agent, and diphenyl disulfide or bis(pentachlorophenyl) disulfide;
- the polyurethane cover composition comprises an isocyanate group-terminated urethane prepolymer including tolylenediisocyanate as isocyanate component and polyoxytetramethyleneglycol as polyol component, and an aromatic polyamine compound.
Dependencies are inferred from the claim text.