Multi-layer core golf ball

摘要

Golf balls having a very high positive gradient multilayer core are provided. The multilayer core includes an outer core layer and a very soft, low compression inner core layer. The inner core layer is formed from an unfoamed composition and has a center hardness that is at least 40 Shore C points less than the outer surface hardness of the outer core layer.

主权项

1. A golf ball comprising a core and a cover, wherein the core consists of:
a solid inner core layer formed from an unfoamed first polybutadiene composition and having a diameter of 1.10 inch or less and a center Shore C hardness (Hcenter) of 40 or less, one or more optional intermediate core layers, and an outer core layer formed from a second polybutadiene composition and having a thickness of 0.150 inches or greater and an outer surface Shore C hardness (Houter surface) of 80 or greater, wherein Houter surface>Hcenter, and Houter surface−Hcenter≧40, and wherein the core has a gradient quotient, Q, of from 7 to 12, as defined by the equation:G+T10×COR=Q where G is the hardness gradient of the core in Shore C as defined by Houter surface minus Hcenter, T is the percent of trans-polybutadiene isomer at the surface of the outer core layer, and COR is the coefficient of restitution of the core measured at an incoming velocity of 125 ft/s.