Golf ball

• US 4,625,964 A
• Filed: 07/05/1984
• Issued: 12/02/1986
• Est. Priority Date: 07/06/1983
• Status: Expired due to Term

• Current Assignee: Sumitomo Rubber Industries Limited
• Original Assignee: Sumitomo Rubber Industries Limited
• Inventors: Yamada, Mikio
• Primary Examiner(s): Marlo, George J.
• Application Number:
  US06/627,719
• Time in Patent Office: 880 Days
• Field of Search: 273/228, 273/229, 273/218, 273/235 R, 273/220, 273/221, 273/219, 273/217, 273/62
• US Class Current: 473/373
• CPC Class Codes: A63B 37/0003 Golf balls
• CPC Class Codes: A63B 37/0031 Hardness
• CPC Class Codes: A63B 37/0064 Diameter
• CPC Class Codes: A63B 37/0066 Density; Specific gravity
• CPC Class Codes: A63B 37/0067 Weight; Mass
• CPC Class Codes: A63B 37/0075 Three piece balls, i.e. cover, intermediate layer and core
• CPC Class Codes: A63B 37/0083 Weight; Mass
• CPC Class Codes: A63B 37/0096 Spin rate

Abstract

A solid golf ball consisting of a core, an intermediate layer and a cover, said core having a diameter of not more than 32 mm and a specific gravity of not less than 1.50 and being a composition comprising 100 parts by weight of a polybutadiene rubber, 10 to 50 parts by weight of zinc acrylate or methacrylate, 10 to 150 parts by weight of zinc oxide and 1 to 5 parts by weight of a cross-linking or curing agent; said intermediate layer having a thickness of 3.2 to 5.4 mm and being a composition comprising 100 parts by weight of a polybutadiene rubber, 10 to 50 parts by weight of zinc acrylate or methacrylate, 0 to 30 parts by weight of zinc oxide and 1 to 5 parts by weight of a cross-linking or curing agent, the specific gravity of said intermediate layer being lower than that of said core; and said cover having a thickness of 1 to 3 mm and a Shore D hardness of not more than 64.

Claims

1. A solid golf ball consisting of a core, an intermediate layer and a cover, said core having a diameter of not more than 32 mm and a specific gravity of not less than 1.50 and being a composition comprising 100 parts by weight of a polybutadiene rubber, 10 to 50 parts by weight of zinc acrylate or methacrylate, 10 to 150 parts by weight of zinc oxide and 1 to 5 parts by weight of a crosslinking or curing agent;

said intermediate layer having a thickness of 3.2 to 5.4 mm and being a composition comprising 100 parts by weight of a polybutadiene rubber, 10 to 50 parts by weight of zinc acrylate or methacrylate, 0 to 30 parts by weight of zinc oxide and 1 to 5 parts by weight of a crosslinking or curing agent, the specific gravity of said intermediate layer being lower than that of said core; and

said cover having a thickness of 1 to 3 mm and a Shore D hardness of not more than 64.

2. The solid golf ball of claim 1, wherein the crosslinking or curing agent is a peroxide.

3. The solid golf ball of claim 2, wherein the peroxide is dicumyl peroxide.

4. The solid golf ball of claim 1, wherein the cover comprises an ionomer resin.