Two-piece solid golf ball
AssigneeSumitomo Rubber Industries, Ltd.
InventorsAkira Kato, Takashi Sasaki
Life of this patent
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Abstract
The present invention provides a two-piece solid golf ball having long flight distance, high spin amount at approach shot and excellent controllability, while maintaining good shot feel. The present invention relates to a two-piece solid golf ball comprising a core and a cover covering the core, wherein a surface hardness in Shore D hardness of the core is higher than a center hardness in Shore D hardness of the core by 15 to 40, the cover is formed from a cover composition comprising a blend of ionomer resin and high rebound characteristics thermoplastic elastomer, the cover has a Shore D hardness of 40 to 60, and the cover hardness is lower than the surface hardness of the core by 1 to 20.
Claims3
A two-piece solid golf ball comprising a core and a cover covering the core, wherein
- a surface hardness in Shore D hardness of the core is higher than a center hardness in Shore D hardness of the core by 15 to 40,
- the cover is formed from a cover composition comprising
- (a) 10 to 80 parts by weight of ethylene-(meth)acrylic acid copolymer ionomer resin,
- (b) 0 to 60 parts by weight of ethylene-(meth)acrylic acid-(meth)acrylic acid ester terpolymer ionomer resin, and
- (c) 5 to 60 parts by weight of thermoplastic elastomer comprising styrene block, based on 100 parts by weight of a base resin,
- the cover has a Shore D hardness of 40 to 60,
- the cover hardness is lower than the surface hardness of the core by 1 to 20, wherein the cover has a thickness of 1.4 to 2.0 mm, and when the cover hardness is represented by A and a total dimple volume is represented by B (mm3),
- the product AB is within the range of 12,000 to 18,000.
Dependencies are inferred from the claim text.