Solid golf ball

Details Solid golf ball Solid golf ball

1995-03-28

2001-08-21

Reddick, Judy M. (Department: 1713)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C260S998140, C273SDIG001, C473S372000, C525S359500, C525S359600, C525S355000, C525S370000, C525S331900, C525S332500, C525S333200

Reexamination Certificate

active

06277924

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a solid golf ball. More particularly, It relates to a solid golf ball which attains a long flying distance and is superior in hit feeling and durability.
BACKGROUND OF THE INVENTION
Generally, golf balls are roughly classified into a thread wound golf ball and a solid golf ball. The thread wound golf ball is produced by winding a thread rubber onto a liquid center comprising a liquid enclosed in a rubber ball or a solid center comprising a crosslinked molded article of a rubber composition at a highly stretched condition to form a thread wound core and then covering the thread wound core with a cover. The solid golf bail includes two-piece solid golf balls or three piece golf balls, produced by covering a solid core comprising a crosslinked molded article having a one- or two-layer structure with a cover, and a one-piece solid golf ball comprising an integrally molded crosslinked article of a rubber composition.
Among them, the two-piece and three-piece solid golf balls have recently, exclusively been used as a golf ball because of there particular long flying distance.
However, the two-piece and three-piece solid golf balls have a drawback in that the hit feeling is hard and inferior in comparison with the thread wound golf ball.
Therefore, in order to improve the drawback of the two-piece and three-piece solid golf balls, a trial of softening the core which makes the ball softer towards its center to increase deformation of the golf ball upon hitting have been studied (e.g. Japanese Laid-Open Patent Publication No. 4 (1992)-109971, etc.).
However, the durability and resilient performances (flying distance) are deteriorated by softening the core.
On the other hand, the one-piece golf ball is mainly used as the golf ball for driving ranges, and in such use, cracking and chipping of the ball surface tend to be caused by repeated hitting in this application. Therefore, excellent durability is particularly necessary for the one-piece golf ball.
OBJECT OF THE INVENTION
As described above, an improvement in the flying distance, hit feeling and durability is requested for the two-piece and three-piece solid golf balls and an improvement in durability is particularly desired for the one-piece solid golf ball.
In order to solve the above problem, the present inventors have paid attention to a base rubber constituting the rubber portions of the solid golf ball. As a result, it has been found that a solid golf ball, which attains a large flying distance and is superior in hit feeling and durability, can be obtained by using polybutadiene, modified with a tin compound, which has a cis content of 40% or more.
The main object of the present invention is to provide a solid golf ball which attains a large flying distance and is superior in hit feeling and durability.
This object as well as other objects and advantages of the present invention will become apparent to those skilled in the art from the following description with reference to the accompanying drawings.


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patent: 5115006 (1992-05-01), Watanabe et al.
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