Golf ball
AssigneesKatsuji Matsunaga, SRI Sports Limited
InventorsKatsuji Matsunaga, Kazuyoshi Shiga, Takeshi Asakura, Mikio Yamada
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Abstract
The present invention aims to improve spin performance and abrasion resistance for a golf ball having a cover using a nonionic polyurethane as a resin component. The golf ball of the present invention is a golf ball including a core and a cover covering the core and in which the cover contains a nonionic polyurethane as a resin component and the nonionic polyurethane has a hard segment content of 24.5% to 34.7% by mass.
Claims8
A golf ball comprising a core and a cover covering the core, wherein the cover contains a nonionic polyurethane having a hard segment content of from 24.5% to 34.7% by mass as a resin component, and the nonionic polyurethane contains an aromatic diol represented by the following formula (1) as a chain extender component
- and
- wherein m and n independently denote an integer of 2 to 4,
- a polycarbonate polyol as a polyol component,
- wherein the polycarbonate polyol has, as a repeating constitutional unit,
- a repeating unit (A) shown in the following formula (2) and
- a repeating unit (B) shown in the following formula (3) and having a different structure from that of (A), and
- a mole ratio of (A)/(B) is from 30/70 to 70/30:
- in formula (2), R′ denotes a bivalent residue obtained by removing two hydroxyl groups from a diol having 4 to 6 carbon atoms;
- and
- in formula (3), R2 denotes a bivalent residue obtained by removing two hydroxyl groups from a diol having 4 to 6 carbon atoms.
Dependencies are inferred from the claim text.