Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
2002-11-25
2004-09-21
Acquah, Samuel A. (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C525S261000, C525S274000, C525S329800, C524S175000, C524S392000, C524S464000, C522S060000, C522S082000, C522S111000, C473S351000
Reexamination Certificate
active
06794454
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a rubber composition for forming a core of a solid golf ball.
2. Description of the Related Art
Conventionally, there have been disclosed techniques for incorporating a metallic salt of an organic sulfur compound such as pentachlorothiophenol into a rubber composition for forming a core of a solid golf ball, to thereby enhance restitution of the core (see Japanese Patent Nos. 2669051, 2961735, and 2778229).
However, as described above, when a metallic salt of an organic sulfur compound is incorporated into a rubber composition for forming a core of a solid golf ball, the curing rate of the rubber composition is lowered, whereby a long time is required for curing the rubber composition, resulting in poor productivity of a core. Meanwhile, when an organic sulfur composition such as thiol or sulfide is incorporated into a rubber composition for forming a core (see Japanese Patent Application Laid-Open (kokai) No. 2001-187167), a long time is required for curing the rubber composition, and the resultant core exhibits unsatisfactory restitution.
SUMMARY OF THE INVENTION
In view of the foregoing, an object of the present invention is to provide a rubber composition for forming a core of a solid golf ball, which exhibits high curing rate, to thereby attain short curing time and improve productivity of a core, and which enables formation of a core of excellent restitution.
In order to achieve the above object, the present inventors have performed extensive studies, and have found that, when a mixture of a metallic salt of an organic sulfur compound and a metallic salt of an unsaturated carboxylic acid, the mixture being prepared by mixing particles of these metallic salts without employment of a solvent (hereinafter the mixture may be referred to as a “dry blend”), and/or a mixture of these metallic salts prepared by mixing particles of the salts in a poor solvent for the particles and then removing the solvent (hereinafter the mixture may be referred to as a “solvent slurry blend”) are incorporated into a rubber composition for forming a core of a solid golf ball, the curing rate of the rubber composition is increased.
The present invention has been accomplished on the basis of this finding. Accordingly, the present invention provides a rubber composition for a solid golf ball comprising a base rubber (A); a filler (B); an organic peroxide (C); and a dry blend and/or a solvent slurry blend (D) of an unsaturated carboxylic acid metallic salt and a metal-containing organic sulfur compound represented by the following formula (1):
(wherein X represents a halogen atom, each of m and n represents an integer of 0 to 5 inclusive, and M represents a divalent metallic atom).
The present invention also provides a solid golf ball (specifically, a one-piece golf ball, or a multi-piece golf ball such as a two-piece golf ball or a three-piece golf ball) comprising a core formed from the rubber composition for a solid golf ball of the present invention.
The present invention also provides a method for producing a rubber composition for a solid golf ball comprising mixing a base rubber (A), a filler (B), an organic peroxide (C), a metal-containing organic sulfur compound (P) represented by formula (1), and an unsaturated carboxylic acid metallic salt (Q), wherein the metal-containing organic sulfur compound (P) represented by formula (1) is mixed with a portion or the entirety of the unsaturated carboxylic acid metallic salt (Q) in advance, to thereby prepare a blend (R); and the blend (R) is mixed with the base rubber (A), the filer (B), and the organic peroxide (C).
Preferably, the blend (R) is the aforementioned dry blend and/or solvent slurry blend (D)) of an unsaturated carboxylic acid metallic salt and a metal-containing organic sulfur compound represented by formula (1).
REFERENCES:
patent: 5252652 (1993-10-01), Egashira et al.
patent: 6583229 (2003-06-01), Mano et al.
patent: 02-092378 (1990-04-01), None
patent: 04-109970 (1992-04-01), None
patent: 2-669051 (1997-07-01), None
patent: 2001-187167 (2001-07-01), None
Acquah Samuel A.
Bridgestone Sports Co. Ltd.
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