Golf ball

Abstract

The object of the present invention is to provide a golf ball excellent in resilience, abrasion-resistance and durability by using a novel anion polyurethane ionomer.

Description

Claims

1. A golf ball having a core and a cover covering the core, wherein a resin component constituting the core or the cover contains a polyurethane ionomer which has an anionic group bonded to at least a part of nitrogen atoms constituting a urethane bond or a urea bond in the main chain structure of the polyurethane.

2. The golf ball according to claim 1, wherein the polyurethane ionomer has a structure shown in Formula (1):

3. The golf ball according to claim 1, wherein the polyurethane ionomer has a structure shown in Formula (2):

4. The golf ball according to claim 1, wherein the anionic group in the polyurethane ionomer is an anionic group derived from an acid selected from the group consisting of a carboxylic acid, a sulfonic acid, a phosphoric acid and a sulfuric acid.

5. The golf ball according to claim 1, wherein the polyurethane ionomer is a polyurethane ionomer obtained by reacting a thermoplastic polyurethane with 1,3-propanesultone.

6. The golf ball according to claim 1, wherein a ratio of the nitrogen atoms to which the anionic group are bonded to all the nitrogen atoms constituting the urethane bond or the urea bond in the main chain structure of the polyurethane is from 0.5 to 50 mol %

7. The golf ball according to claim 1, wherein the polyurethane ionomer has a slab hardness of 70 or more in shore A hardness.

8. The golf ball according to claim 1, wherein the golf ball is a two-piece golf ball having a core and a cover covering the core wherein the resin component constituting the cover contains the polyurethane ionomer.

9. The golf ball according to claim 1, wherein the golf ball is a three-piece golf ball having a core, an intermediate layer covering the core and a cover covering the intermediate layer wherein the resin component constituting the cover or the intermediate layer contains the polyurethane ionomer

10. A golf ball having a core and a cover covering the core, wherein a resin component constituting the core or the cover contains a polyurethane ionomer which has an anionic group bonded to at least a part of nitrogen atoms constituting a urethane bond or a urea bond in the main chain structure of the polyurethane, the polyurethane ionomer has structures shown in Formulae (1) and (2):

11. The golf ball according to claim 10, wherein the anionic group in the polyurethane ionomer is an anionic group derived from an acid selected from the group consisting of a carboxylic acid, a sulfonic acid, a phosphoric acid and a sulfuric acid.

12. The golf ball according to claim 11, wherein the polyurethane ionomer is a polyurethane ionomer obtained by reacting a thermoplastic polyurethane with 1,3-propanesultone.

13. The golf ball according to claim 12, wherein a ratio of the nitrogen atoms to which the anionic group are bonded to all the nitrogen atoms constituting the urethane bond or the urea bond in the main chain structure of the polyurethane is from 0.5 to 50 mol %.

14. The golf ball according to claim 13, wherein the polyurethane ionomer has a slab hardness of 70 or more in shore A hardness.

15. The golf ball according to claim 14, wherein the golf ball is a two-piece golf ball having a core and a cover covering the core wherein the resin component constituting the cover contains the polyurethane ionomer.

16. The golf ball according to claim 14, wherein the golf ball is a three-piece golf ball having a core, an intermediate layer covering the core and a cover covering the intermediate layer wherein the resin component constituting the cover or the intermediate layer contains the polyurethane ionomer.