Patent ID: 9186556
Filing Date: 2015-11-17
Classification: A63B

Abstract:
1. A golf ball comprising: a unitary core having an outer surface, a geometric center, and a soft transition region adjacent to the outer surface, the core being formed from a substantially homogenous composition; and an outer cover layer; wherein the soft transition region has a thickness of up to 4 mm, comprises about 8 to 20 percent trans-polybutadiene isomer, and has a negative hardness gradient of up to 15 Shore C, and wherein the unitary core has an overall negative hardness gradient of up to 20 Shore C and has a gradient quotient, GQ, defined by the equation: where G is the overall negative hardness gradient in Shore C, T is the percent of trans-polybutadiene isomer at the core outer surface, and COR is the coefficient of restitution measured at an incoming velocity of 125 ft/s.