| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a composition which has the compatibility of high resilience with high hardness and does not change a carry with atmospheric temperature by constituting the composition of dimethyl siloxane having a methyl vinyl siloxy unit of a prescribed value or above in a degree of polymerization in a prescribed amount, reinforceable silica, a hardener and the silane or siloxane compound and/or silazane compound expressed by specific formula. SOLUTION: The golf ball core material composition is formed of 100 pts.wt. A: the dimethyl siloxane having the methyl vinyl siloxy unit of the degree of polymerization of >=3000 at 0.5 to 20 mol%, 10 to 120 pts.wt. B: the reinforceable silica, the amount necessary for hardening C: the hardener and 0.1 to 50 pts.wt. D: the silane or siloxane compound expressed by the formula I and/or the silazane compound expressed by the formula II. In the formula R1, R2 are hydrogen atoms or univalent hydrocarbon groups which may be the same or different, 0<a, 0<b, 0<a+b<=4. In the formula II, R3 is a univalent hydrocarbon group, provided that the group has >=1 unsaturated hydrocarbon group in one molecule.</p> |
