US 9,808,675 B2
Golf ball compositions
Michael Michalewich, Norton, MA (US); Brian Comeau, Berkley, MA (US); and Shawn Ricci, New Bedford, MA (US)
Assigned to Acushnet Company, Fairhaven, MA (US)
Filed by Acushnet Company, Fairhaven, MA (US)
Filed on Nov. 11, 2015, as Appl. No. 14/937,985.
Application 14/937,985 is a continuation in part of application No. 13/613,095, filed on Sep. 13, 2012, granted, now 9,227,109.
Prior Publication US 2016/0059083 A1, Mar. 3, 2016
Int. Cl. A63B 37/04 (2006.01); A63B 37/12 (2006.01); A63B 37/00 (2006.01); A63B 45/02 (2006.01); C08G 18/48 (2006.01); C08G 18/76 (2006.01); C09D 175/08 (2006.01); C08L 33/02 (2006.01); C09D 175/04 (2006.01); A63B 45/00 (2006.01)
CPC A63B 37/0051 (2013.01) [A63B 37/0012 (2013.01); A63B 37/0022 (2013.01); A63B 37/0031 (2013.01); A63B 37/0033 (2013.01); A63B 37/0039 (2013.01); A63B 37/0043 (2013.01); A63B 37/0045 (2013.01); A63B 37/0062 (2013.01); A63B 37/0063 (2013.01); A63B 37/0064 (2013.01); A63B 37/0065 (2013.01); A63B 37/0074 (2013.01); A63B 37/0075 (2013.01); A63B 37/0076 (2013.01); A63B 45/02 (2013.01); C08G 18/4854 (2013.01); C08G 18/7671 (2013.01); C08L 33/02 (2013.01); C09D 175/04 (2013.01); C09D 175/08 (2013.01); A63B 37/0009 (2013.01); A63B 37/0018 (2013.01); A63B 45/00 (2013.01); C08L 2205/025 (2013.01)] 4 Claims
 
1. A golf ball comprising:
an inner core layer formed from a diene rubber composition and having a diameter of from 0.950 inches to 1.015 inches, an Atti compression of 30 or less, a center Shore C hardness of from 65 to 75, a surface Shore C hardness of from 50 to 65, and a zero hardness gradient or a negative hardness gradient wherein the difference between the Shore C hardness of the outer surface of the inner core layer and the Shore C hardness of the center of the inner core layer is from −15 to −5;
an outer core layer formed from a diene rubber composition and having a thickness of from 0.250 inches to 0.300 inches and an outer surface Shore C hardness of from 85 to 95;
an inner cover layer formed from an ionomer composition and having a thickness of from 0.030 inches to 0.040 inches and an outer surface Shore C hardness of 93 or greater;
an outer cover layer formed from a polyurethane composition and having a thickness of from 0.030 inches to 0.035 inches and an outer surface Shore C hardness of from 75 to 90;
a pigmented solvent-borne primer coat; and
a solvent-borne top coat;
wherein the polyurethane outer cover layer composition comprises a reaction product of a prepolymer and a curing agent, wherein the prepolymer is a reaction product of a polyol mixture and a diisocyanate, wherein the polyol mixture comprises 2-(2H-benzotriazol-2-yl)-4-(1,1,3,3-tetramethylbutyl)phenol; and
wherein a core assembly consisting of the inner core layer and the outer core layer has an Atti compression of from 80 to 95.