Golf Balls Having Cores Made of Polybutadiene Rubber Blends

摘要

Multi-piece golf balls having a core made of a polybutadiene rubber blend are provided. The golf ball contains a multi-layered core. The inner core is formed from a blend containing a non-metallocene catalyzed polybutadiene rubber and metallocene-catalyzed polybutadiene rubber. The surrounding outer core layer is made of a non-metallocene-catalyzed polybutadiene rubber. Catalysts such as neodymium, nickel, and cobalt based catalysts may be used to make the non-metallocene catalyzed rubber. Catalysts such as ferrocene, cobaltocene, nickelocene, titanocene dichloride, zirconocene dichloride, and samraocene based catalysts may be used to make the metallocene-catalyzed rubber. The multi-layered core is surrounded by a cover having at least one layer. The resulting ball has high resiliency and a soft compression feel.

主权项

1. A golf ball, comprising:
a) a dual core having an inner core and outer core layer, the inner core having an outer surface and geometric center and the outer core layer having an outer surface and inner surface; the inner core comprising a cured rubber mixture of about 50 to about 95% by weight non-metallocene-catalyzed polybutadiene rubber and about 5 to about 50% by weight metallocene catalyzed polybutadiene rubber, and the outer core layer comprising non-metallocene-catalyzed polybutadiene rubber with no metallocene-catalyzed polybutadiene rubber being present in the outer core layer;
wherein the center of the inner core and surface of the outer core layer each has a hardness and the surface hardness of the outer core layer is greater than the center hardness of the inner core; and, wherein the non-metallocene catalyzed rubber has a first Mooney viscosity and the metallocene-catalyzed polybutadiene rubber has a second Mooney viscosity, the second Mooney viscosity being greater than the first Mooney viscosity, the cured rubber mixture being prepared by adding cured non-metallocene-catalyzed polybutadiene rubber to non-cured metallocene-catalyzed polybutadiene rubber and curing the mixture; b) a cover having at least one layer disposed about the dual core.