Golf club grip and golf club

1. A golf club grip formed from a rubber composition comprising a base rubber and a crosslinking agent,

wherein the base rubber consists essentially of a hydrogenated acrylonitrile-butadiene rubber and/or a carboxyl-modified acrylonitrile-butadiene rubber; or

consists essentially of a hydrogenated acrylonitrile-butadiene rubber and/or a carboxyl-modified acrylonitrile-butadiene rubber, and at least one selected from the group consisting of an acrylonitrile-butadiene rubber, an isoprene rubber, a butadiene rubber, an ethylene-propylene-diene rubber, a chloroprene rubber, a butyl rubber, an acrylic rubber, a urethane rubber, an epichlorohydrin rubber, a polysulfide rubber and a natural rubber.

2. The golf club grip according to claim 1 , wherein the hydrogenated acrylonitrile-butadiene rubber contains double bond in an amount ranging from 0.09 mmol/g to 2.5 mmol/g.

3. The golf club grip according to claim 2 , wherein the hydrogenated acrylonitrile-butadiene rubber contains acrylonitrile in a content ranging from 15 mass % to 50 mass %.

4. The golf club grip according to claim 1 , wherein the rubber composition comprises a reinforcing material in a content ranging from 0 part by mass to 50 parts by mass with respect to 100 parts by mass of the base rubber.

5. The golf club grip according to claim 4 , wherein the reinforcing material is at least one member selected from the group consisting of carbon black, silica, calcium carbonate, titanium oxide, and clay.

6. The golf club grip according to claim 1 , wherein the rubber composition comprises, as a vulcanization activator, at least one member selected from the group consisting of a metal oxide, a metal peroxide and a fatty acid.

7. The golf club grip according to claim 6 , wherein the rubber composition comprises, as the vulcanization activator, the metal oxide and/or the metal peroxide, and the fatty acid.

8. The golf club grip according to claim 1 , wherein the rubber composition comprises, as a vulcanization accelerator, at least one member selected from the group consisting of a thiuram type vulcanization accelerator, a guanidine type vulcanization accelerator, a dithiocarbamate type vulcanization accelerator, a thiourea type vulcanization accelerator, a thiazole type vulcanization accelerator, and a sulfenamide type vulcanization accelerator.

9. The golf club grip according to claim 1 , wherein the hydrogenated acrylonitrile-butadiene rubber contains double bond in an amount ranging from 0.09 mmol/g to 2.5 mmol/g, and acrylonitrile in an amount ranging from 15 mass % to 50 mass %,

the rubber composition comprises carbon black in a content ranging from 2.0 parts by mass to 50 parts by mass with respect to 100 parts by mass of the base rubber, and

the rubber composition comprises, as a vulcanization activator, a metal oxide and/or a metal peroxide, and fatty acid.

10. The golf club grip according to claim 1 , wherein the hydrogenated acrylonitrile-butadiene rubber is a hydrogenated product of a copolymer of a monomer having a carboxyl group, acrylonitrile and butadiene, and

the copolymer contains the monomer having the carboxyl group in an amount ranging from 1 mass % to 30 mass %.

11. The golf club grip according to claim 1 , wherein the carboxyl-modified acrylonitrile-butadiene rubber contains a monomer having a carboxyl group in an amount ranging from 1.0 mass % to 8.0 mass %.

12. The golf club grip according to claim 1 , wherein the carboxyl-modified acrylonitrile-butadiene rubber contains a monomer having a carboxyl group in an amount ranging from 3.5 mass % to 8.0 mass %.

13. The golf club grip according to claim 1 , wherein the carboxyl-modified acrylonitrile-butadiene rubber contains acrylonitrile in an amount ranging from 26 mass % to 34 mass %.

14. A golf club comprising a shaft, a head provided on one end of the shaft, and a grip provided on another end of the shaft, wherein the grip is formed from a rubber composition comprising a base rubber and a crosslinking agent, and wherein the base rubber consists essentially of a hydrogenated acrylonitrile-butadiene rubber and/or a carboxyl-modified acrylonitrile-butadiene rubber; or

consists essentially of a hydrogenated acrylonitrile-butadiene rubber and/or a carboxyl-modified acrylonitrile-butadiene rubber, and at least one selected from the group consisting of an acrylonitrile-butadiene rubber, an isoprene rubber, a butadiene rubber, an ethylene-propylene-diene rubber, a chloroprene rubber, a butyl rubber, an acrylic rubber, a urethane rubber, an epichlorohydrin rubber, a polysulfide rubber and a natural rubber.

15. The golf club according to claim 14 , wherein the hydrogenated acrylonitrile-butadiene rubber contains double bond in an amount ranging from 0.09 mmol/g to 2.5 mmol/g.

16. The golf club according to claim 15 , wherein the hydrogenated acrylonitrile-butadiene rubber contains acrylonitrile in an amount ranging from 15 mass % to 50 mass %.

17. The golf club according to claim 14 , wherein the rubber composition comprises a reinforcing material in a content ranging from 2.0 parts by mass to 50 parts by mass with respect to 100 parts by mass of the base rubber.

18. The golf club according to claim 17 , wherein the reinforcing material is carbon black.

19. The golf club according to claim 14 , wherein the rubber composition comprises at least one member selected from the group consisting of a metal oxide, a metal peroxide and a fatty acid as a vulcanization activator; and at least one member selected from the group consisting of a thiuram type vulcanization accelerator, a guanidine type vulcanization accelerator, a dithiocarbamate type vulcanization accelerator, a thiourea type vulcanization accelerator, a thiazole type vulcanization accelerator, and a sulfenamide type vulcanization accelerator as a vulcanization accelerator.

20. The golf club according to claim 14 , wherein the hydrogenated acrylonitrile-butadiene rubber is a hydrogenated product of a copolymer of a monomer having a carboxyl group, acrylonitrile and butadiene, and

the copolymer contains the monomer having the carboxyl group in an amount ranging from 1 mass % to 30 mass %.

21. The golf club according to claim 14 , wherein the carboxyl-modified acrylonitrile-butadiene rubber contains a monomer having a carboxyl group in an amount ranging from 1.0 mass % to 8.0 mass %.

22. The golf club according to claim 14 , wherein the carboxyl-modified acrylonitrile-butadiene rubber contains acrylonitrile in an amount ranging from 26 mass % to 34 mass %.