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Golf ball

Inactive Publication Date: 2013-01-03
DUNLOP SPORTS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a golf ball with a uniform hardness and low energy loss when hit. It has excellent resilience and can achieve a longer flight distance when hit with a driver. Conversely, it has a high spin rate when hit with a short iron, providing better control.

Problems solved by technology

In a golf ball that achieves a high trajectory by a high spin rate, a flight distance is insufficient.
When a backspin rate is high, the run is short.
However, a golf ball having a low spin rate has inferior controllability.
The core has a high energy loss when being hit.
This hardness distribution impairs resilience performance.

Method used

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Examples

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Effect test

example 1

[0179]A rubber composition was obtained by kneading 100 parts by weight of a high-cis polybutadiene (trade name “BR-730”, manufactured by JSR Corporation), 37 parts by weight of zinc diacrylate (trade name “Sanceler SR”, manufactured by SANSHIN CHEMICAL INDUSTRY CO., LTD.), 5 parts by weight of zinc oxide, an appropriate amount of barium sulfate, 0.32 parts by weight of 2-naphthalenethiol, 10 parts by weight of zinc stearate, and 0.8 parts by weight of dicumyl peroxide. This rubber composition was placed into a mold including upper and lower mold halves each having a hemispherical cavity, and heated at 170° C. for 25 minutes to obtain a core with a diameter of 39.80 mm. The amount of barium sulfate was adjusted such that the weight of a golf ball is 45.4 g.

[0180]A resin composition was obtained by kneading 50 parts by weight of an ionomer resin (the aforementioned “Himilan 1605”), 50 parts by weight of another ionomer resin (the aforementioned “Himilan AM7329”), and 4 parts by weigh...

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Abstract

A golf ball 2 includes a core 4, a mid layer 6, a reinforcing layer 8, and a cover 10. When distances (%) from the central point of the core 4 to nine points and JIS-C hardnesses at the nine points, which are obtained by dividing a region from the central point of the core 4 to the surface of the core 4 at intervals of 12.5% of the radius of the core 4, are plotted in a graph, R2 of a linear approximation curve obtained by a least-square method is equal to or greater than 0.95. The difference (H(100)−H(0)) between a JIS-C hardness H(100) at the surface of the core 4 and a JIS-C hardness H(0) at the central point of the core 4 is equal to or greater than 15.

Description

[0001]This application claims priority on Patent Application No. 2011-144118 filed in JAPAN on Jun. 29, 2011. The entire contents of this Japanese Patent Application are hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to golf balls. Specifically, the present invention relates to golf balls that include a solid core, a mid layer, and a cover.[0004]2. Description of the Related Art[0005]Golf players' foremost requirement for golf balls is flight performance. In particular, golf players place importance on flight performance upon a shot with a driver. Flight performance correlates with the resilience performance of a golf ball. When a golf ball having excellent resilience performance is hit, the golf ball flies at a high speed, thereby achieving a large flight distance. Golf balls that include a core having excellent resilience performance are disclosed in JPS61-37178, JP2008-212681 (US 2008 / 0214324), JP2008...

Claims

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Application Information

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IPC IPC(8): A63B37/06A63B37/02
CPCA63B37/0003A63B37/0051A63B37/0076A63B37/008A63B37/0083A63B37/0063A63B37/0031A63B37/0033A63B37/0043A63B37/0045A63B37/0092C08K5/098
Inventor MATSUYAMA, YOSHIKOISOGAWA, KAZUHIKOTACHIBANA, KOSUKE
Owner DUNLOP SPORTS CO LTD
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