Golf ball

Abstract

The invention provides a golf ball endowed with an improved distance and durability. The ball has a core and a cover, the core being formed of a rubber composition containing a base rubber, a co-crosslinking agent, a crosslinking initiator and a metal oxide. The base rubber is a mixture of (A) polybutadiene with (B) styrene-butadiene rubber and / or isoprene rubber, the co-crosslinking agent is methacrylic acid, and the metal oxide is zinc oxide. The rubber composition contains the crosslinking initiator in an amount of from 1.2 to 5 parts by weight per 100 parts by weight of the base rubber.

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates to a golf ball composed of a core and a cover. More specifically, the invention relates to a golf ball which has a reduced spin rate and thus can achieve an increased distance, which shortens the vulcanization time for the core-forming rubber composition and thus improves productivity, and which has a good durability even in long-term use.[0002]In contemplating the ball construction of golf balls intended for use in competition, to impart a flight performance and feel of the sort typically experienced when playing a round of golf, it is more desirable to use a two-piece solid golf ball than a one-piece ball. Particularly in golf balls composed of a core and a cover, conferring the ball with an increased distance owing to a reduced spin rate is one of the most desirable characteristics because it enables the game to be played with a competitive advantage.[0003]As is widely known, two-piece solid golf balls are composed of...

AI Technical Summary

Benefits of technology

The present invention provides a golf ball that has a reduced spin rate, can achieve an increased distance, and has good durability even in long-term use. This is achieved by improving the core-forming rubber composition, which contains cis-1,4-polybutadiene rubber, methacrylic acid as the co-crosslinking agent, and a mixture of polybutadiene with styrene-butadiene rubber and / or isoprene rubber as the base rubber. By adding styrene-butadiene rubber and / or isoprene rubber and controlling the initial velocities of the ball and core, the distance can be controlled and the durability can be improved.

Problems solved by technology

However, when zinc methacrylate is used in this way in a core-forming rubber composition, achieving good ball durability in long-term use has been difficult.

However, here too, when zinc acrylate is used in the core-forming rubber composition, achieving good ball durability in long-term use has been difficult.

However, this prior-art golf ball lacks a satisfactory durability to “surface loss” when hit with the sharp portion of a clubhead, such as the leading edge of an iron.

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