Practice golf ball

a golf ball and golf technology, applied in the field of golf balls, can solve the problems of difficult to golfers will be unable to take full advantage of the skills acquired through practice, and achieve good ball durability in long-term use at golf driving ranges, and achieve good flight performance, good appearance, and better durability to cracking.

Inactive Publication Date: 2012-11-01
BRIDGESTONE SPORTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013]We have discovered that, in the production of practice golf balls having a core and a cover, by using methacrylic acid as a co-crosslinking agent for the base rubber in the core-forming rubber composition and by using a resin material having a breaking strength of from 20 MPa to 80 MPa and an elongation of from 150% to 600% as the cover material, owing to the synergistic effects of these materials,

Problems solved by technology

If, for example, a practice ball has a feel on impact or a flight performance which differs from that of a game ball, when the time comes to play an actual round, the golfer will be unable to take full advantage of the skills acquired through practice.
However, when zinc methacrylate is used in this way in a core-forming rubber composition, achieving good ball durability in long-term

Method used

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Examples

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examples

[0112]The following Examples and Comparative Examples are provided to illustrate the invention, and are not intended to limit the scope thereof.

examples 1 to 4

, Comparative Examples 1 to 4

[0113]Rubber materials formulated as shown in Table 1 below were furnished for the fabrication of practice golf balls in the Examples and Comparative Examples. These rubber compositions were suitably mixed using a kneader or roll mill, then vulcanized under the temperature and time conditions in Table 1 to produce solid cores in the respective Examples. Ingredient amounts in the table below are shown in parts by weight.

TABLE 1Type of Core(1)(2)(3)(4)(5)(6)(7)CoreBR0110060609510010095formulationIR220055BR514040Perhexa C-400.60.6(40% dilution)Actual amount0.240.24of additionPercumyl D1.071.070.80.80.60.61.07Zinc oxide232323236623Antioxidant0.20.20.20.20.20.20.2Methacrylic acid22.522.51822.522.5Zinc methacrylate33Zinc acrylate33Titanium oxide4VulcanizationTemperature (° C.)170170170170160160170conditionsTime (minutes)20202020131330

[0114]Details on the materials used in the core formulations in the above table are provided below.[0115](1) BR01: A butadiene r...

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Abstract

A practice golf ball has a core made of a rubber composition which includes a base rubber, a co-crosslinking agent, a crosslinking initiator and a metal oxide, and has a cover which encases the core and is made of a resin material. The co-crosslinking agent is methacrylic acid. The resin material has a breaking strength of 20 to 80 MPa and an elongation of 150 to 600%. The ball is endowed with the properties required of practice balls intended for long-term use, including better durability to cracking and durability of appearance than ordinary game balls, and also better durability to ball surface loss than the one-piece golf balls which are commonly used as practice balls.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This non-provisional application claims priority under 35 U.S.C. §119(a) on Patent Application No. 2011-099853 filed in Japan on Apr. 27, 2011, the entire contents of which are hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a practice golf ball which is suitable for use at such places as driving ranges. More specifically, the invention relates to a practice golf ball endowed with the properties required of practice balls intended for long-term use, including better durability to cracking and durability of appearance than ordinary game balls, and also better durability to ball surface loss than the one-piece golf balls which are commonly used as practice balls.[0004]2. Prior Art[0005]In terms of the performance sought in a practice golf ball, it is generally desirable to obtain ball characteristics which are no different from those of golf balls used to play ...

Claims

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Application Information

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IPC IPC(8): A63B69/36A63B37/00
CPCA63B69/3655A63B37/0087A63B37/0033A63B37/0063A63B37/0066A63B37/0074A63B37/0023A63B37/0035A63B37/0051A63B37/0054A63B37/0064A63B37/0065A63B37/008A63B37/0083A63B37/0003A63B37/0006A63B37/0017A63B37/0019A63B37/0021A63B37/0084A63B37/0031A63B37/00215
Inventor HIGUCHI, HIROSHIYAMAGISHI, HISASHIARAI, DAISUKEOZAWA, YUICHIROOHIRA, TAKASHISATO, KATSUNORI
Owner BRIDGESTONE SPORTS
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