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Golf ball

A golf ball and ball core technology, applied in the field of golf balls, can solve the problems of high spin rate of golf balls and poor flight performance of golf balls, and achieve the effects of small energy loss, suitable hardness distribution, and excellent elastic performance

Inactive Publication Date: 2012-03-07
DUNLOP SPORTS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The golf ball has too much spin rate
The golf ball has poor flight performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0115] With 100 parts by weight of high-cis polybutadiene (high-cis polybutadiene) (the product of the trade name " BR-730 " that JRS company produces), the zinc acrylate of 27.0 parts by weight, the zinc oxide of 5 parts by weight, the zinc oxide of 12.3 parts by weight Barium sulfate, 0.2 parts by weight of 2-naphthalenethiol, and 0.8 parts by weight of dicumyl peroxide were kneaded to obtain a rubber composition. The rubber composition was put into a mold with upper and lower halves each having a hemispherical cavity, and heated at a temperature of 170° C. for 25 minutes to obtain a core with a diameter of 39.6 mm.

[0116] Using a twin-screw kneading extruder, 34 parts by weight of an ionomer resin (the aforementioned "Surlyn 8945"), 40 parts by weight of another ionomer resin (the aforementioned "Himilian AM7329"), 26 parts by weight of a styrene-embedded A thermoplastic elastomer (the aforementioned "Rabalon T3221C") and 32 parts by weight of tungsten powder were kneaded...

Embodiment 2 to 11 and comparative example 1 to 7

[0119] The implementation of the golf balls of Examples 2 to 11 and Comparative Examples 1 to 7 is the same as in Example 1, except that the details of the core, mid layer, and cover are changed.

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Abstract

A golf ball 2 includes a spherical core 4, a mid layer 6, and a cover 8. The core 4 is obtained by crosslinking a rubber composition. The difference between: a hardness H(5.0) at a point which is located at a distance of 5 mm from the central point of the core 4; and a hardness Ho at the central point is 6.0 or greater. The difference between: a hardness H(12.5) at a point which is located at a distance of 12.5 mm from the central point; and the hardness H(5.0) is 4.0 or less. The difference between a hardness Hs at the surface of the core 4 and the hardness H(12.5) is 10.0 or greater. The difference between the hardness Hs and the hardness Ho is 22.0 or greater. There is no zone in which a hardness decreases from the central point to the surface. A Shore D hardness H3 of the cover is greater than a Shore D hardness H2 of the mid layer.

Description

[0001] This application claims priority to Patent Application No. 2010-147123 filed in Japan on Jun. 29, 2010. The content of this prior application is hereby incorporated by reference in its entirety. technical field [0002] This invention relates to golf balls. More specifically, the present invention relates to golf balls that include a solid core, a mid layer, and a cover. Background technique [0003] The biggest appeal of golfers to golf balls is the performance of their flight. Golfers place a high value on flight performance when hitting a ball with drivers, long irons and middle irons. Flight performance is related to the elastic properties of the golf ball. When a golf ball having excellent elastic properties is hit, it flies at a high speed, thereby obtaining a long flight distance. [0004] In order to obtain a large flight range, an appropriate trajectory height is required. Track height depends on spin rate and launch angle. If a golf ball achieves a hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A63B37/06A63B37/00
CPCA63B37/0033A63B37/0043A63B37/0045A63B37/0047A63B37/0062A63B37/0066A63B37/0075A63B37/0031
Inventor 五十川一彦中村拓尊
Owner DUNLOP SPORTS CO LTD
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