Golf ball
AssigneeBridgestone Corporation
InventorTasuku Saito
Life of this patent
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Abstract
Disclosed herein is a two-piece type solid golf ball formed by enclosing a solid core with a thermoplastic resin cover. It provides a long overall distance, improved controlability, extended durability, and good shot feeling. The solid core contains polybutadiene having more than 40% of cis-1,4 bonds and an unsaturated carboxylic acid and/or a metal salt thereof to crosslink the polybutadiene and deforms 1.5 to 3.5 mm under a constant load of 100 kg. The cover is 0.4 to 2.2 mm thick and consists of a 0.1 to 2 mm thick inner layer and a 0.1 to 1.5 mm thick outer layer enclosing the inner layer, both made of thermoplastic resins, said inner layer generating a stress of 20 to 100 kg/cm.sup.2 at 10% elongation and having a resilience higher than 40%, and said outer layer having a flexural modulus of 2000 to 5000 kg/cm.sup.2 and a resilience higher than 35%.
Claims10
A solid golf ball comprising a solid core and a cover enclosing said solid core, characterized in that said solid core is one which contains polybutadiene rubber having more than 40% of cis-1,4 bonds and an unsaturated carboxylic acid and/or a metal salt thereof to crosslink the polybutadiene rubber and deforms 1.5 to 3.5 mm under a constant load of 100 kg, and said cover is a 0.4 to 2.2 mm thick which consists of a 0.1 to 2 mm thick inner layer and a 0.1 to 1.5 mm thick outerlayer enclosing the inner layer, both made of thermoplastic resins, said inner layer having a stress of 20 to 100 kg/cm.sup.2 at 10% elongation measured according to ASTM 638-86 and having resilience higher than 40% measured by a Dunlop tripsometer which is defined in British Standard No. 903, and said outerlayer having flexural modulus of 2000 to 5000 kg/cm.sup.2 measured according to ASTM D 790 and a resilience higher than 35% measured by a Dunlop tripsometer as defined above.
Dependencies are inferred from the claim text.