DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to improved core construction and several methods for improving core construction.
Broadly, the golf ball core of the invention consists of a spherical central portion which is hard and resilient and which may be formed by molding conventional core formulations.
A soft, relatively easily deformed outer layer or skin is embodied or integral with the central portion.
Conventional solid cores are typically compression or injection molded from a slug of uncured elastomer composition comprising at least polybutadiene and a metal salt of an alpha, beta, ethylinically unsaturated monocarboxylic acid.
Metal oxide or other fillers, such as barytes may also be included to increase core weight so that the finished ball more closely approaches the U.
S.
G.
A.
upper weight limit of 1.
620 ounces.
More specifically, the core compositions and resulting molded golf balls of the present invention are manufactured using conventional ingredients and blending techniques.
In this regard, the core compositions of the invention may be based on polybutadiene, and mixtures of polybutadiene with other elastomers.
It is preferred that the base elastomer have a relatively high molecular weight.
The broad range for the molecular weight of suitable base elastomers is from about 50,000 to about 500,000.
A more preferred range for the molecular weight of the base elastomer is from about 100,000 to about 500,000.
As a base elastomer for the core composition, cis-polybutadiene is preferably employed, or a blend of cis-polybutadiene with other elastomers may also be utilized.
Most preferably, cis-polybutadiene having a weight-average molecular weight of from about 100,000 to about 500,000 is employed.
Along this line, it has been found that the high cis-polybutadiene manufactured and sold by Shell Chemical Co.
, Houston, Tex.
, under the trade name Cariflex BR-1220 is particularly well suited.
The unsaturated carboxylic acid component of the core composition (a co-cross-linking agent) is the reaction product of the selected carboxylic acid or acids and an oxide or carbonate of a metal such as zinc, magnesium, barium, calcium, lithium, sodium, potassium, cadmium, lead, tin, and the like
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