Rubber composition for golf ball
AssigneeSRI Sports Limited
InventorsKoichi Fujisawa, Kazuhisa Fushihara
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Abstract
The present invention provides a rubber composition for obtaining golf ball having good processability, excellent rebound characteristics and excellent durability. The present invention relates to a rubber composition for golf ball comprising a base rubber, a co-crosslinking agent, an organic peroxide, a filler and a processing aid, wherein the base rubber comprises a polybutadiene (a) containing a cis-1,4 bond of not less than 80% and synthesized using lanthanide-containing catalyst, the organic peroxide comprises an organic peroxide having 10 hours half-life period temperature of 80 to 100° C., and the processing aid is fatty acid ester, fatty acid salt or the mixture thereof.
Claims5
A golf ball comprising a core formed by vulcanizing and press-molding a rubber composition and at least one layer of a cover covering the core, wherein
- the rubber composition comprises a base rubber, a co-crosslinking agent, an organic peroxide, a filler and a processing aid,
- the base rubber comprises a polybutadiene (a) containing a cis-1,4 bond of not less than 80% and synthesized using lanthanide-containing catalyst,
- the organic peroxide comprises an organic peroxide having 10 hours half-life period temperature of 80 to 100° C.,
- the processing aid is fatty acid ester, fatty acid salt or a mixture thereof, and
- the polybutadiene (a) has a ratio (Mw/Mn) of weight average molecular weight (Mw) to number average molecular weight (Mn) of 2.5 to 3.5, and
- the core has a center hardness in JIS-C hardness of 50 to 70, a surface hardness in JIS-C hardness of 70 to 90 and a hardness difference (B-A) between the surface hardness (B) and the center hardness (A) of 15 to 28.
Dependencies are inferred from the claim text.