Patent ID: 9155938
Filing Date: 2015-10-13
Classification: A63B

Abstract:
1. A golf ball comprising: a core comprising an inner core layer and an outer core layer, the inner core layer having a geometric center hardness of about 66 to 82 Shore C and a surface hardness of 62 to 78 Shore C and being softer than the center hardness to define a negative hardness gradient; an outer cover layer comprising a polyurea, a polyurethane, or a hybrid thereof, the outer cover layer having a Vicker's hardness of about 0.18 to 0.40 as measured on the ball at 0.49 N with a 10-s hold time; and an inner cover layer comprising ionomer and being disposed between the core and the outer cover layer; wherein the outer core layer comprises a stiffening thermoplastic polymer, has a surface hardness of 86 to 96 Shore C, and is harder than the geometric center by about 10 to 20 Shore C to define a positive hardness gradient.