Rubber compositions comprising high levels of oily substance and the use thereof in golf balls
The present invention is directed to golf balls having at least one layer formed from a rubber composition comprising a base rubber and from 10 parts to 120 parts of an oily substance, by weight per 100 parts of the base rubber. The base rubber is a polybutadiene having a Mooney viscosity of 40 or greater. The rubber composition may be present in any one or more of a core layer, a cover layer, or an intermediate layer.
1. A solid golf ball comprising a core and a cover, wherein the core is formed from a rubber composition comprising a base rubber and from 10 parts to 25 parts of an oily substance, by weight per 100 parts of the base rubber, wherein the base rubber is a polybutadiene having a Mooney viscosity of 45 or greater.
2. The solid golf ball of claim 1 , wherein the polybutadiene has a Mooney viscosity of 55 or greater.
3. The solid golf ball of claim 1 , wherein the polybutadiene has a Mooney viscosity of 65 or greater.
4. The solid golf ball of claim 1 , wherein the polybutadiene rubber is neodymium-catalyzed polybutadiene.
5. The solid golf ball of claim 4 , wherein the polybutadiene rubber has a cis content of 90% or greater.
6. The solid golf ball of claim 1 , wherein the oily substance is a low PCA oil.
7. The solid golf ball of claim 1 , wherein the core has a compression of 50 or less.
8. The solid golf ball of claim 1 , wherein the cover has an overall thickness of 0.1 inches or greater.
9. The solid golf ball of claim 1 , wherein the cover includes a layer formed from a highly resilient material selected from partially- and fully-neutralized acid copolymers and blends thereof.