JP2012130694A5 - - Google Patents

Claims (2)

An inner core made of a first substantially uniform rubber composition with a geometric center and a first outer surface;
An outer core layer made from a second substantially uniform rubber composition and having a second outer surface;
An inner cover layer disposed around the core, having an ionomer-based material and having a material hardness of 60 Shore D or more;
An outer cover layer disposed around the inner cover layer, having castable polyurea or castable polyurethane and having a material hardness of 60 Shore D or less;
The hardness of the first outer surface is small in the range up to 2 0 Shore C Ri by hardness of the geometric center to form an inner core layer of a negative hardness gradient, the hardness of the second outer surface, the golf ball the outer core layer is formed of a large positive hardness gradient in the range of up to 1 8 Shore C Ri by hardness of the geometric center, forming a shallow positive core hardness gradient. And the geometric center, the geometric center or et al. 0. 8 or et al. 1. 3 inches and a first inner core with an outer surface positioned in the range of (2.03 or et 3 .30cm), The ratio of initiator antioxidants 0. The inner core made from five or more first substantially uniform rubber compositions;
An outer core layer made from the first one of the different second substantially homogeneous rubber composition, the geometric center or al 1. 53 or et al. 1. And the outer core layer with a second outer surface positioned 58 inches (3.89 or et 4 .01cm),
Is formed around said core, an inner cover layer having a 1 6 wt% or more of the acid content of ionomer and grafted metallocene catalyzed polyolefins maleic acid,
An outer cover layer formed around the inner cover layer and having castable polyurea or castable polyurethane;
The hardness of the first outer surface is rather less than the hardness of the geometric center - 1 or al - 15 negative hardness gradient formation, the hardness of the second outer surface of the inner surface of the outer core layer A golf ball that forms an outer core layer with a positive hardness gradient that is greater than 12 Shore C in hardness.