Wound-core golf ball
AssigneeSumitomo Rubber Industries, Ltd.
InventorSatoshi Iwami
Life of this patent
Estimating the term…
Abstract
A wound-core golf ball having a polyurethane cover is disclosed. The polyurethane cover is formed by curing a composition comprising a tolylene diisocyanate polyurethane prepolymer and dimethylthiotoluene diamine, and exhibits superior cut resistance. The wound-core golf ball of the invention further comprises a double-layered center having a diameter of 25 to 35 mm and a rubber thread layer covering the center. The center comprises an inner core layer having a diameter of 24 to 33 mm and a JIS-A hardness of 5 to 50, and an outer core layer covering the inner core layer and having a Shore D hardness of 10 and to 60. The wound-core golf ball thus constructed imparts a good shot feeling to the golfer and offers an increased flight distance.
Claims14
A wound-core golf ball having a polyurethane cover made by curing a composition containing a polyurethane prepolymer and dimethylthiotoluene-diamine, wherein all of the polyurethane prepolymer contained in the composition consists essentially of tolylenediisocyanate polyurethane prepolymer, and said ball further comprises:
- a center having a diameter of 25 to 35 mm;
- and
- a rubber thread layer covering the center,
- wherein the center consists essentially of:
- an inner core layer having a diameter of 24 to 33 mm and a JIS-A hardness of 5 to 50;
- and
- an outer core layer covering the inner core layer and having a Shore D hardness of 10 to 60.
A wound-core golf ball having a polyurethane cover made by curing a composition containing a polyurethane prepolymer and dimethylthiotoluene diamine at the temperature of 60 to 100° C., wherein all of the polyurethane prepolymer contained in the composition consists essentially of tolylenediisocyanate polyurethane prepolymer, and said ball further comprises:
- a center having a diameter of 26 to 32 mm;
- and
- a rubber thread layer covering the center,
- wherein the center consists essentially of;
- an inner core layer having a diameter of 25 to 31 mm and a JIS-A hardness of 20 to 45;
- and
- an outer core layer covering the inner core layer and having a Shore D hardness of 15 to 55.
Dependencies are inferred from the claim text.