Patent ID: 7909709
Filing Date: 2011-03-22
Classification: A63B

Abstract:
1. A golf ball comprising: an inner core having a first outer surface and a geometric center and being formed from a first substantially homogenous rubber composition throughout, the rubber composition comprising a base rubber and a resorcinol such that the geometric center has a hardness of 40 to 60 Shore C and the first outer surface has a hardness of 70 or greater; an outer core layer disposed about the inner core, the outer core layer having a second outer surface having a hardness of 50 to 75 Shore C and an inner surface having a hardness of 51 to 76 Shore C and being formed from a second substantially homogenous composition throughout; and a cover layer disposed about the outer core layer; wherein the geometric center, the first and second outer surfaces, and the inner surface each have a hardness, the hardness of the first outer surface being greater than the hardness of the geometric center to define a positive hardness gradient of greater than 20 Shore C, and the hardness of the second outer surface being lower than the hardness of the inner surface to define a negative hardness gradient of −1 to −5 Shore C.