Golf ball with improved cover
AssigneeWilson Sporting Goods Co.
InventorJames R. Proudfit
Life of this patent
Estimating the term…
Abstract
A golf ball includes a core and a cover which is formed from two separate inner and outer layers. The inner layer is molded over the core and is formed from ionomer resin. The outer layer is molded over the inner layer and is formed from a blend of natural or synthetic balata and a crosslinkable elastomer such as polybutadiene. The elastomer is thermally crosslinked with a metallic salt of an unsaturated fatty acid, such as zinc diacrylate, and a crosslinking initiator such as organic peroxide.
Claims25
A golf ball comprising a core and a cover, the cover comprising an inner layer molded over the core and an outer layer molded over the inner layer, the inner layer comprising ionomer resin and the outer layer containing natural or synthetic balata as a principal ingredient.
A golf bal comprising a core and a cover, the cover comprising an inner layer of ionomer resin molded over the core and an outer layer molded over the inner layer, the outer layer being formed from a composition comprising:
- a) natural or synthetic balata;
- b) an elastomer which is crosslinkable with a metallic salt of an unsaturated fatty acid, said elastomer being selected from the group consisting of polyoctenylene;
- homopolymers, copolymers, or terpolymers of butadiene;
- and homopolymers, copolymers or terpolymers of chloroprene;
- c) a metallic salt of an unsaturated fatty acid as a crosslinking agent;
- and
- d) a crosslinking initiator which provides a source of free radicals.
A golf ball comprising a core and a cover, the cover comprising an inner layer of ionomer resin molded over the core and an outer layer molded over the inner layer, the outer layer being formed from a composition comprising:
- a) from 25 to 99 parts by weight of natural or synthetic balata;
- b) from 1 to 75 parts by weight of an elastomer which is crosslinkable with a metallic salt of an unsaturated fatty acid, said elastomer being selected from the group consisting of polyoctenylene, homopolymers, copolymers, or terpolymers of butadiene;
- and homopolymers, copolymers, or terpolymers of chloroprene;
- c) from 20 to 50 parts by weight of a metallic salt of an unsaturated fatty acid as a crosslinking agent;
- and
- d) from 3/4 to 31/2 parts by weight of a crosslinking initiator which provides a source of free radicals.
A method of making a golf ball comprising the steps of:
- a) forming a spherical core;
- b) molding ionomer resin over the core to form a first cover layer;
- c) forming a blended composition of balata, crosslinkable elastomer, a metallic salt of an unsaturated fatty acid as a crosslinking agent, and a crosslinking initiator which provides a source of free radicals, said crosslinkable elastomer being selected from the group consisting of polyoctenylene, homopolymers, copolymers, or terpolymers of butadiene;
- and homopolymers, copolymers, and terpolymers of chloroprene;
- and
- d) molding said blended composition over the first cover layer to form a second cover layer and to crosslink the crosslinkable elastomer.
Dependencies are inferred from the claim text.