Golf ball
AssigneeSRI Sports Limited
InventorsTsutomu Hirau, Toshiyuki Tarao
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Abstract
An object of the present invention is to provide a golf ball comprising a core and a cover, wherein the cover is made from a cover composition containing, as a resin component, a thermoplastic polyurethane (A) and a polyisocyanate mixture (B) in which a urethane prepolymer (b-1) having at least two isocyanate groups is dispersed in a thermoplastic resin (b-2) which does not substantially react with an isocyanate group; and wherein the cover composition has a slab hardness of more than 60 and not more than 75, and the cover has a thickness of 2.5 mm or less.
Claims13
A golf ball comprising a core and a cover covering the core,
- wherein the cover is made from a cover composition containing, as a resin component,
- a thermoplastic polyurethane (A) and
- a polyisocyanate mixture (B) in which a urethane prepolymer (b-1) having at least two isocyanate groups is dispersed in a thermoplastic resin (b-2) which does not substantially react with an isocyanate group;
- and
- wherein a number average molecular weight of a polyol component constituting the urethane prepolymer (b-1) is 650 or more, the polyisocyanate mixture (B) has NCO content (NCO %) of 0.1 mass % to 3.0 mass %, the cover composition has a slab hardness of more than 60 and not more than 75 in Shore D hardness, and
- the cover has a thickness of 2.5 mm or less.
Dependencies are inferred from the claim text.