US 5,490,674 AGranted

Three-piece solid golf ball

AssigneeSumitomo Rubber Industries, Ltd.

InventorsAkihiko Hamada, Yoshimasa Koizumi, Hidenori Hiraoka, Yoshikazu Yabuki

Life of this patent

Estimating the term…

Loading patent…

Abstract

The present invention provides a solid golf ball having excellent flying performances, stability upon iron shot and good hit feeling. A solid core 1 comprising an center 1a and an outer shell 1b is coated with a cover 2 to give a three-piece solid golf ball. The center 1a has a diameter of 30.7 to 39.5 mm, a stiffness of 300 to 2,500 kgf/cm.sup.2 and a shore D hardness of 30 to 55. The outer layer core 1b has a thickness of 1.0 to 4.0 mm, a stiffness of 2,500 to 6,000 kgf/cm.sup.2 and a shore D hardness of 55 to 75. The composition of both cores is a butadiene rubber. The cover 2 has a thickness of 0.6 to 2.0 mm, a stiffness of 1,000 to 2,500 kgf/cm.sup.2 and a shore D hardness of 40 to 55. The composition of the cover is an ionomer resin or a mixture of the ionomer resin and a flexible resin.

Claims3

Dependent claims

A three-piece solid golf ball comprising a two-piece solid core and a cover for covering the two-piece solid core, said two-piece solid core being composed of a center and an outer shell covering said center, wherein the center, the outer shell and the cover have the following characteristics respectively:

(1):
Center
Diameter:
30.7 to 39.5 mm
Physical properties:
stiffness:
300 to 2,500 kgf/cm.sup.2
shore D hardness:
30 to 55
Composition:
vulcanized rubber obtained from a butadiene rubber, co-crosslinkable monomer, zinc oxide and peroxides as an essential component
(2) Outer shell
Thickness:
1.0 to 4.0 mm
Physical properties:
stiffness:
2,500 to 6,000 kgf/cm.sup.2
shore D hardness:
55 to 75
Composition:
vulcanized rubber obtained from a butadiene rubber, a co-crosslinkable monomer, zinc oxide and peroxides as an essential component
(3):
Cover
Thickness:
0.6 to 2.0 mm
Physical properties:
stiffness:
1,000 to 2,500 kgf/cm.sup.2
shore D hardness:
40 to 55
Composition:
cover obtained from an ionomer resin or a mixture of the ionomer resin and a flexible resin as a base resin.

29 more elements

Dependencies are inferred from the claim text.