Golf club grip and golf club

Abstract

An object of the present disclosure is to provide a golf club grip comprising an inner layer that is hard to collapse and has excellent weather resistance. The present disclosure provides a golf club grip comprising a cylindrical portion having a cylindrical inner layer and a cylindrical outer layer provided outside the cylindrical inner layer, wherein the cylindrical inner layer is formed from an inner layer rubber composition containing an acrylonitrile-butadiene based rubber as (A1) a base rubber, and the inner layer rubber composition has a maximum torque value of 0.5 Nm or more in a vulcanization curve measured at a temperature of 165° C. and an amplitude angle of one degree.

1 . A golf club grip comprising a cylindrical portion having a cylindrical inner layer and a cylindrical outer layer provided outside the cylindrical inner layer, wherein
 the cylindrical inner layer is formed from an inner layer rubber composition containing an acrylonitrile-butadiene based rubber as (A1) a base rubber, and the inner layer rubber composition has a maximum torque value of 0.5 N·m or more in a vulcanization curve measured at a temperature of 165° C. and an amplitude angle of one degree.   
     
     
         2 . The golf club grip according to  claim 1 , wherein the cylindrical inner layer is a porous layer. 
     
     
         3 . The golf club grip according to  claim 2 , wherein the porous layer has a density in a range from 0.20 g/cm 3  to 0.60 g/cm 3 . 
     
     
         4 . The golf club grip according to  claim 1 , wherein the cylindrical inner layer is a porous layer obtained by heating the inner layer rubber composition containing microballoons to foam the microballoons. 
     
     
         5 . The golf club grip according to  claim 1 , wherein the cylindrical inner layer has an elongation at break of 730% or less in a tensile test. 
     
     
         6 . The golf club grip according to  claim 1 , wherein the cylindrical inner layer has a swollen ratio of 200% or less in a toluene swollen test. 
     
     
         7 . The golf club grip according to  claim 1 , wherein the acrylonitrile-butadiene based rubber includes an acrylonitrile-butadiene rubber (NBR) and a hydrogenated acrylonitrile-butadiene rubber (HNBR). 
     
     
         8 . The golf club grip according to  claim 7 , wherein an amount of the acrylonitrile-butadiene rubber (NBR) in (A1) the base rubber ranges from 10 mass % to 90 mass %. 
     
     
         9 . The golf club grip according to  claim 1 , wherein the cylindrical outer layer contains at least one member selected from the group consisting of a carboxyl-modified acrylonitrile-butadiene rubber, a hydrogenated acrylonitrile-butadiene rubber and a carboxyl-modified hydrogenated acrylonitrile-butadiene rubber as (A2) a base rubber. 
     
     
         10 . The golf club grip according to  claim 1 , wherein the maximum torque value ranges from 0.5 N·m to 1.3 N·m. 
     
     
         11 . The golf club grip according to  claim 1 , wherein the cylindrical inner layer has an elongation at break ranging from 300% to 730% in a tensile test. 
     
     
         12 . The golf club grip according to  claim 1 , the cylindrical inner layer has a swollen ratio ranging from 100% to 200% in a toluene swollen test. 
     
     
         13 . 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 a golf club grip comprising a cylindrical portion having a cylindrical inner layer and a cylindrical outer layer provided outside the cylindrical inner layer, wherein the cylindrical inner layer is formed from an inner layer rubber composition containing an acrylonitrile-butadiene based rubber as (A1) a base rubber, and the inner layer rubber composition has a maximum torque value of 0.5 N·m or more in a vulcanization curve measured at a temperature of 165° C. and an amplitude angle of one degree. 
     
     
         14 . The golf club according to  claim 13 , wherein the cylindrical inner layer is a porous layer. 
     
     
         15 . The golf club according to  claim 13 , wherein the cylindrical inner layer has an elongation at break of 730% or less in a tensile test. 
     
     
         16 . The golf club according to  claim 13 , wherein the cylindrical inner layer has a swollen ratio of 200% or less in a toluene swollen test. 
     
     
         17 . The golf club according to  claim 13 , wherein the acrylonitrile-butadiene based rubber includes an acrylonitrile-butadiene rubber (NBR) and a hydrogenated acrylonitrile-butadiene rubber (HNBR). 
     
     
         18 . The golf club according to  claim 13 , wherein an amount of the acrylonitrile-butadiene rubber (NBR) in (A1) the base rubber ranges from 10 mass % to 90 mass %. 
     
     
         19 . The golf club according to  claim 13 , wherein the cylindrical outer layer contains at least one member selected from the group consisting of a carboxyl-modified acrylonitrile-butadiene rubber, a hydrogenated acrylonitrile-butadiene rubber and a carboxyl-modified hydrogenated acrylonitrile-butadiene rubber as (A2) a base rubber. 
     
     
         20 . The golf club according to  claim 13 , wherein the maximum torque value ranges from 0.5 N·m to 1.3 N·m, and the cylindrical inner layer has an elongation at break ranging from 300% to 730% in a tensile test and has a swollen ratio ranging from 100% to 200% in a toluene swollen test.