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.
1. 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), R 2 denotes a bivalent residue obtained by removing two hydroxyl groups from a diol having 4 to 6 carbon atoms.
2. The golf ball according to claim 1 , wherein the aromatic diol is hydroquinonebis (2-hydroxyethyl)ether.
3. The golf ball according to claim 2 , wherein R 1 denotes a bivalent residue obtained by removing two hydroxyl groups from 1,5-pentanediol and R 2 denotes a bivalent residue obtained by removing two hydroxyl groups from 1,6-hexanediol, and the mole ratio of (A)/(B) is 50/50.
4. The golf ball according to claim 3 , wherein the nonionic polyurethane has a hard segment content of 25.4% to 28.6% by mass.
5. The golf ball according to claim 1 , wherein R′ denotes a bivalent residue obtained by removing two hydroxyl groups from 1,5-pentanediol and R 2 denotes a bivalent residue obtained by removing two hydroxyl groups from 1,6-hexanediol, and the mole ratio of (A)/(B) is 50/50.
6. The golf ball according to claim 1 , wherein the nonionic polyurethane has a hard segment content of from 25.4% to 28.6% by mass.
7. The golf ball according to claim 6 , wherein the aromatic diol is hydroquinonebis (2-hydroxyethyl)ether.
8. The golf ball according to claim 6 , wherein R 1 denotes a bivalent residue obtained by removing two hydroxyl groups from 1,5-pentanediol and R 2 denotes a bivalent residue obtained by removing two hydroxyl groups from 1,6-hexanediol, and the mole ratio of (A)/(B) is 50/50.