Golf ball

Abstract

In a golf ball having a core and a cover of one or a plurality of layers that encases the core, the core or at least one layer of the cover is formed of a resin composition which contains from 5 to 250 parts by weight of a mechanoluminescent material that receives mechanical energy and luminesces per 100 parts by weight of a base material which is a rubber material or a resin material. This golf ball has an excellent visibility in that, even under dark conditions, the ball impact site can be clearly confirmed visually at the time of impact. Moreover, the ball is able to maintain a good scuff resistance.

1 . A golf ball comprising a core and a cover of one or a plurality of layers that encases the core, wherein the core or at least one layer of the cover is formed of a resin composition which contains from 5 to 250 parts by weight of a mechanoluminescent material that receives mechanical energy and luminesces per 100 parts by weight of a base material which is a rubber material or a resin material. 
     
     
         2 . The golf ball of  claim 1 , wherein the mechanoluminescent material is a material comprising strontium aluminate crystals doped with primarily at least one type of rare-earth ion. 
     
     
         3 . The golf ball of  claim 1 , wherein the mechanoluminescent material-containing resin material is an ionomer resin. 
     
     
         4 . The golf ball of  claim 1 , wherein an outermost layer of the cover is formed of a mechanoluminescent material-containing resin composition, the content of the mechanoluminescent material being from 15 to 100 parts by weight per 100 parts by weight of the resin material. 
     
     
         5 . The golf ball of  claim 1  wherein the cover has a plurality of layers, and an inner cover layer adjoining an outermost layer of the cover is formed of a mechanoluminescent material-containing resin composition. 
     
     
         6 . The golf ball of  claim 5 , wherein the content of the mechanoluminescent material included in the inner cover layer is from 20 to 250 parts by weight per 100 parts by weight of the resin material.