Golf ball

Abstract

The present invention provides a golf ball including a core and a cover, wherein the cover is formed of polyurethane as a chief material, the polyurethane contains bio-based carbon measured according to the ISO 16620-2 standard, and a weight ratio of a biomass material containing the bio-based carbon to a total cover amount is from 10 to 45 wt %.

1 . A golf ball comprising a core and a cover, wherein the cover is formed of polyurethane as a chief material, the polyurethane contains bio-based carbon measured according to the ISO 16620-2 standard, and a weight ratio of a biomass material containing the bio-based carbon to a total cover amount is from 10 to 45 wt %. 
     
     
         2 . The golf ball of  claim 1 , wherein in the cover, a product of a weight ratio of the biomass material and a material hardness (Shore D) is at least 470 and less than 2,010. 
     
     
         3 . The golf ball of  claim 1 , wherein the cover is formed of a resin composition containing the following components (I) and (II):
 (I) polyurethane, and   (II) a (meth)acrylic block copolymer.   
     
     
         4 . The golf ball of  claim 3 , wherein a compounding amount of the component (II) is not more than 20 parts by weight per 100 parts by weight of the component (I). 
     
     
         5 . The golf ball of  claim 3 , wherein a material hardness of the component (II) is not more than 40 on the Shore D hardness scale. 
     
     
         6 . The golf ball of  claim 3 , wherein the component (II) has a rebound elasticity of not more than 40% as measured according to the JIS-K 6255 standard. 
     
     
         7 . The golf ball of  claim 3 , wherein a melt flow rate (MFR) value of the component (II) is at least 20 g/10 min under measurement conditions of 230° C. and a load of 2.16 kgf (ISO 1133). 
     
     
         8 . The golf ball of  claim 3 , wherein in the block copolymer of the component (II), a hard segment is mainly composed of a methyl methacrylate unit, and a soft segment is mainly composed of an n-butyl acrylate unit or an n-butyl acrylate/2-ethylhexyl acrylate unit. 
     
     
         9 . The golf ball of  claim 8 , wherein a content of the methyl methacrylate unit in the block copolymer of the component (II) is from 20 to 50 wt %. 
     
     
         10 . The golf ball of  claim 1 , wherein the cover has a thickness of from 0.6 to 1.8 mm.