Patent ID: 8979676
Filing Date: 2015-03-17
Classification: A63B,C08G,C08L

Abstract:
1. A golf ball comprising: an inner core, the inner core comprising a thermoplastic resin; wherein the inner core layer has a density of 0.85 g/cm wherein the inner core layer has a Shore D hardness cross-sectional hardness between any two points on the cross-section of within ±6; an outer core layer, the outer core substantially surrounding the inner core and comprising a thermoset rubber; and at least one cover layer; wherein the inner core has a compression deformation of from about 3.5 mm to about 4.1 mm, the outer core layer has a compression deformation of from about 2.7 mm to about 3.3 mm, and the outer core layer has a thickness of at least 4.8 mm, wherein compression deformation is measured as a difference between amount of deformation under a 10 kg load and amount of deformation under a 130 kg load; and wherein the golf ball has a first initial velocity measured at a club head speed of about 80 mph, the golf ball has a second initial velocity measured at a club head speed of about 125 mph, the initial velocities being otherwise measured under the same conditions, and the difference between the second initial velocity and the first initial velocity is at least about 86 mph, wherein the inner cover layer has a surface Shore D hardness of at least about 60 and the outer cover layer has a surface Shore D hardness of from about 50 to about 60, wherein the outer cover layer comprises a thermoplastic polyurethane crosslinked by reaction of unsaturated bonds provided by preparing the polyurethane polymer using an unsaturated diol of formula (1): wherein R