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| Electrophoretic display and novel process for its manufacture |
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Rubber composition and golf ball comprising it
| Details |
Inventors: Yuki, Syoji; Tokui, Yasuyuki; Nishiuchi, Kihachiro; Wada, Kenichi; Suzue, Masayoshi; Morimoto, Takuo;
Assignee: Asics Corporation (Kobe, JP); Otsuka Chemical Co., Ltd. (Osaka, JP)
Primary Examiner: Lieberman; Allan M.
Assistant Examiner:
Attorney, Agent or Firm: Nixon & Vanderhye
A rubber composition comprising at least one natural and/or synthetic rubber component(s), fine inorganic fibers subjected to a surface treatment with a surface treating agent and a non-sulfur type vulcanizing agent and a golf ball comprising the composition which exhibits excellent durability, bounce impact elasticity and excellent feeling upon hitting. |
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DETAILED DESCRIPTION OF THE INVENTION As the rubber component of the composition of the invention, any of the various known rubbers can be used.
Examples of the rubber component include natural rubber (NR), isoprene rubber (IR), styrene-butadiene rubber (SBR), nitrile rubber (NBR), butadiene rubber (BR), chloroprene rubber (CR), butyl rubber (IIR), acrylic rubber (AR), urethane rubber (UR), silicone rubber (SiR), fluorocarbon rubber (FR), ethylene-propylene rubber (EPR), chlorosulphonated polyethylene (CSM), ethylene-vinyl acetate rubber (EVA), chlorinated polyethylene (CPE), polyisobutylene (PIB), alfin rubber (AL), polyester rubber (ESR), epichlorohydrin rubber (ECR), chlorinated isobutylene-isoprene rubber (CIR), nitrile-isobutylene rubber (NIR), ionomer resin, trans-polyisoprene resin and the like.
The rubber component preferably contains at least 30% by weight of polybutadiene of cis-1,4-configuration, because the hardness and bounce impact elasticity of the composition containing such rubber component are particularly improved.
Though it is no clear whey this improvement is caused, it is supposed that the reinforcing effect efficiently utilizing the shape of the fine fibers contained in the composition is obtained due to the reaction of the sulfur component of the surface treating agent with polybutadiene of cis-1,4-configuration.
This theory is supported by the fact that a greater improvement of hardness and bounce of impact elasticity can be obtained in the compositions utilizing such sulfur-containing surface treating agent than those utilizing a conventional surface treating agent containing no sulfur component, for example, alkoxysilane type surface treating agent such as methyltrimethoxysilane, methyltriethoxysilane, .
gamma.
-glycidoxypropyltrimethoxysilane and .
gamma.
-aminopropyltriethoxysilane.
When the rubber composition of the present invention is used as a hard elastomer of the surface cover layer in a multi-layer golf-ball such as two-piece golf ball, three-piece golf ball, thread wound golf ball and the like, the rubber component is preferably ionomer resin or trans-polyisoprene resin from the viewpoint of the high elasticity and wear resistance
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Nonmetallic Processes 
