Golf club head

Abstract

This invention provides a hollow golf club head having a viscoelastic body, wherein the viscoelastic body is made by mixing a plurality of types of viscoelastic materials with loss coefficients the temperature dependences of which are different.

1 . A hollow golf club head having a viscoelastic body, wherein said viscoelastic body is made by mixing a plurality of types of viscoelastic materials with loss coefficients temperature dependences of which are different.  
   
   
       2 . The head according to  claim 1 , wherein peak value temperatures of the loss coefficients of the plurality of types of viscoelastic materials are different from each other.  
   
   
       3 . The head according to  claim 1 , wherein the plurality of types of viscoelastic materials include two types of viscoelastic materials whose peak value temperatures of loss coefficients have a difference of not less than 15° C.  
   
   
       4 . The head according to  claim 1 , wherein the plurality of types of viscoelastic materials include a viscoelastic material with a loss coefficient a peak value temperature of which is less than −30° C. and a viscoelastic material with a loss coefficient a peak value temperature of which is not less than −30° C.  
   
   
       5 . The head according to  claim 1 , wherein the loss coefficient of said viscoelastic body is not less than 0.3 in a range from −40° C. (inclusive) to −10° C. (inclusive).  
   
   
       6 . The head according to  claim 1 , wherein said viscoelastic body is disposed in a sole portion of the golf club head.  
   
   
       7 . The head according to  claim 1 , wherein said head comprises one of a wood type golf club head and utility type golf club head.