Golf ball

Abstract

In a golf ball having a rubber core of at least one layer and a cover of at least one layer encasing the core, at least one layer of the cover is formed of a resin composition that includes (A) polyurethane or polyurea, and (B) a thermoplastic polyester elastomer. Component (B) is included in a ratio of not more than 45 wt % of the overall amount of the resin composition, and the resin composition has a Shore D hardness of 42 or less and a rebound resilience of from 60 to 72%. The golf ball has an excellent controllability on approach shots, is able to maintain a good feel at impact and a good scuff resistance, and also has a good moldability.

1 . A golf ball comprising a rubber core of at least one layer and a cover of at least one layer encasing the core, wherein at least one layer of the cover is formed of a resin composition comprised of
 (A) polyurethane or polyurea, and   (B) a thermoplastic polyester elastomer,   
       component (B) being included in a ratio of not more than 45 wt % of the overall amount of the resin composition and the resin composition having a Shore D hardness of 42 or less and a rebound resilience of from 60 to 72%. 
     
     
         2 . The golf ball of  claim 1 , wherein the rebound resilience of the resin composition is from 62 to 70%. 
     
     
         3 . The golf ball of  claim 1 , wherein the polyurethane or polyurea serving as component (A) has a Shore D hardness of 45 or less and a rebound resilience of at least 55%. 
     
     
         4 . The golf ball of  claim 1 , wherein the thermoplastic polyester elastomer serving as component (B) has a Shore D hardness of not more than 35 and a rebound resilience of at least 65%. 
     
     
         5 . The golf ball of  claim 1 , wherein component (B) has a melt viscosity at 200° C. and a shear rate of 243 sec −1  which is from 0.2×10 4  to 1.0×10 4  dPa·s.