Multi-piece solid golf ball
AssigneeBridgestone Sports Co., Ltd.
InventorsYoshinori Egashira, Seisuke Tomita
Life of this patent
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Abstract
A multi-piece solid golf ball has a solid core of multi-layer configuration including an inner layer circumscribed by an outer layer. The core inner layer is formed from a rubber composition. The core outer layer is formed thereon by injection molding a mixture of 100-50 wt % of a polyether ester type thermoplastic elastomer having a Shore D hardness of 30-50 and a Tg of up to -25.degree. C. and 0-50 wt % of an ethylene-(meth)acrylate copolymer ionomer having a flexural modulus of 200-400 MPa. The core is surrounded by a cover of an ethylene-(meth)acrylate copolymer ionomer having a flexural modulus of 200-450 MPa and a Shore D hardness of 55-68. The ball shows improved flying performance, feel on impact and durability and lends itself to mass production.
Claims6
A multi-piece solid golf ball comprising, a solid core circumscribed by a cover, the solid core being of a multi-layer configuration including a core inner layer circumscribed by at least one core outer layer, wherein
- said core outer layer is formed of a material predominantly comprising a mixture of 100 to 50% by weight of a polyether ester type thermoplastic elastomer having a Shore D hardness of 30 to 50 and a glass transition temperature of up to -25.degree. C. as measured by differential thermal analysis and 0 to 50% by weight of an ionomer in the form of an ethylene-(meth)acrylate copolymer having a flexural modulus of 200 to 400 MPa, and
- said cover is formed of an ionomer in the form of an ethylene-(meth)acrylate copolymer having a flexural modulus of 200 to 450 MPa and a Shore D hardness of 55 to 68.
Dependencies are inferred from the claim text.