The object of the present invention is to provide a golf ball which has excellent durability and wear-resistance and provides an excellent shot feeling. The present invention provides a golf ball comprising: a core consisting of a center and at least one intermediate layer covering the center; and a cover covering the core, wherein the cover is formed from a cover composition containing a thermoplastic polyurethane (A), a polyisocyanate compound (B) having at least two isocyanate groups, and a polyhydroxyether (C) as a resin component, wherein the cover composition has a slab hardness from 20 to 55 in shore D hardness, and the cover has a thickness from 0.1 mm to 1.5 mm.
1. A golf ball comprising:
a core consisting of a center and at least one intermediate layer covering the center; and
a cover covering the core,
wherein the cover is formed from a cover composition containing a thermoplastic polyurethane (A), a polyisocyanate compound (B) having at least two isocyanate groups, and a polyhydroxyether (C) as a resin component,
wherein the cover composition has a slab hardness from 20 to 55 in shore D hardness,
the cover has a thickness from 0.1 mm to 1.5 mm, and the polyhydroxyether (C) has a repeating structural unit represented by Formula (1):
wherein R 1 and R 2 are the same or different from each other, and each are a hydrogen atom or a methyl group.
2. The golf ball according to claim 1 , wherein the polyhydroxyether (C) is represented by Formula (2):
wherein R 3 , R 4 , R 5 , R 6 are the same or different from each other, and each are a hydrogen atom or a methyl group; X and Y are the same or different from each other, and each are an epoxy group or a hydroxyethyl group; and n is a positive integer.
3. The golf ball according to claim 1 , wherein the polyhydroxyether (C) has a number average molecular weight from 100 to 100,000.
4. The golf ball according to claim 1 , wherein the polyhydroxyether (C) is an epoxy resin having an epoxy equivalent ranging from 1,000 g/eq to 20,000 g/eq.
5. The golf ball according to claim 1 , wherein the polyhydroxyether (C) is an epoxy resin having a number average molecular weight ranging from 1,000 to 8,000.
6. The golf ball according to claim 1 , wherein the polyhydroxyether (C) is a phenoxy resin having a weight average molecular weight ranging from 10,000 to 100,000.
7. The golf ball according to claim 1 , wherein an amount of the polyhydroxyether (C) is 1 to 20 parts by mass with respect to 100 parts by mass of the thermoplastic polyurethane (A).
8. The golf ball according to claim 1 , wherein the polyisocyanate (B) is a polyisocyanate mixture (B+b) where the polyisocyanate (B) is dispersed into a thermoplastic resin (b) which does not substantially react with an isocyanate group.
9. The golf ball according to claim 1 , wherein the intermediate layer in contact with the cover is formed from a resin composition.
10. The golf ball according to claim 1 , wherein the intermediate layer in contact with the cover has a thickness ranging from 0.5 mm to 2.3 mm.
11. The golf ball according to claim 1 , wherein a resin composition forming the intermediate layer in contact with the cover has a slab hardness from 50 to 75 in shore D hardness.
12. A golf ball comprising:
a core consisting of a center and at least one intermediate layer covering the center; and
a cover covering the core,
wherein the cover is formed from a cover composition containing a thermoplastic polyurethane (A), a polyisocyanate compound (B) having at least two isocyanate groups, and a polyhydroxyether (C) represented by the following formula (2) as a resin component, the cover composition has a slab hardness from 20 to 55 in shore D hardness, and the cover has a thickness from 0.1 mm to 1.5 mm,
wherein an intermediate layer in contact with the cover layer is formed from a resin composition which has a slab hardness from 50 to 75 in shore D hardness, and the intermediate layer in contact with the cover has a thickness ranging from 0.5 mm to 2.3 mm
13. The golf ball according to claim 12 , wherein the polyhydroxyether (C) has a number average molecular weight from 100 to 100,000.
14. The golf ball according to claim 12 , wherein the polyhydroxyether (C) is an epoxy resin having an epoxy equivalent ranging from 1,000 g/eq to 20,000 g/eq.
15. The golf ball according to claim 12 , wherein the polyhydroxyether (C) is an epoxy resin having a number average molecular weight ranging from 1,000 to 8,000.
16. The golf ball according to claim 12 , wherein the polyhydroxyether (C) is a phenoxy resin having a weight average molecular weight ranging from 10,000 to 100,000.
17. The golf ball according to claim 12 , wherein an amount of the polyhydroxyether (C) is 1 to 20 parts by mass with respect to 100 parts by mass of the thermoplastic polyurethane (A).
18. The golf ball according to claim 12 , wherein the polyisocyanate (B) is a polyisocyanate mixture (B+b) where the polyisocyanate (B) is dispersed into a thermoplastic resin (b) which does not substantially react with an isocyanate group.