Golf ball

a golf ball and ball technology, applied in the field of golf balls, can solve the problems of cracks in the core and core breakage, and achieve the effects of improving durability, prolonging flight distance, and poor durability

US20180178078A1Inactive Publication Date: 2018-06-28BRIDGESTONE SPORTS
20 Cites 0 Cited by

Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
Publication Date
2018-06-28
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
Patent Text Reader

Abstract

To provide a golf ball that ensures both an improved durability and an extended flight distance, in which cracks or breakage of a core can be prevented while making the hardness of the core surface greater so as to obtain the greater difference in hardness between the core surface and the core center. The golf ball of the present invention includes a core and a cover that surrounds the core, in which the core includes a base rubber and an unsaturated carboxylic acid or its salt as a co-crosslinking agent, the core has a surface hardness of 80 or more in terms of JIS-C hardness, and the unsaturated carboxylic acid or its salt contained in a region ranging from a surface of the core toward its center by less than 2 mm has an average particle diameter of less than 90 μm.
Need to check novelty before this filing date? Find Prior Art

Description

CROSS-REFERENCE TO RELATED APPLICATION

[0001] This Application claims priority from Japanese Patent Application No. 2016-256210 filed Dec. 28, 2016, which is incorporated herein by reference in its entirety.BACKGROUND OF THE INVENTION

[0002] The present invention relates to a golf ball, and more particularly, relates to a golf ball that ensures both improved durability and extended flight distance.

[0003] The core of a golf ball is manufactured by molding a rubber composition, in which an unsaturated carboxylic acid or its salt as a co-crosslinking agent is contained in a base rubber such as butadiene rubber, under heat and pressure. In this rubber composition, the unsaturated carboxylic acid or its salt is contained in a large amount with respect to the base rubber. However, the unsaturated carboxylic acid or its salt is more likely to adhere to the surface of the inner wall of a kneading machine during kneading, thereby hindering kneading operation. Furthermore, since the unsaturated ca...

Examples

example

[0047]Golf balls comprising a core having a composition (parts by weight as a unit) and configuration shown in Table 1 were manufactured, and then tests were carried out about various aspects of performance of the core and golf ball, especially, the productivity of the core, the spin performance of the golf ball, and the durability of the golf ball. The results are shown in Table 2.

[0048]All the golf balls in Examples and Comparative Examples contained the same materials having the same composition mainly comprising ionomer resin and had dimples arranged in the same manner.

TABLE 1ExamplesComparative examples123451234CenterButadiene rubber100100100100100100100100100coreZinc oxide444444444Barium sulfate19.919.919.99.1213.1519.919.919.913.15Age resister0.10.10.10.10.10.10.10.10.1Pentachlorothiophenol zinc salt0.10.10.10.20.10.10.10.10.1Unsaturated metal carboxylate A———35.728.1————Unsaturated metal carboxylate B151515——15151528.1Metal carboxylate A2.22.22.26.3—2.22.22.2—Metal carboxyla...