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Golf ball

a golf ball and ball technology, applied in the field of golf balls, can solve the problems of inferior controllability of golf balls with low spin rate, insufficient flight distance, short run, etc., and achieve the effects of low spin rate, excellent resilience performance, and low energy loss

Inactive Publication Date: 2013-03-14
DUNLOP SPORTS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is a new kind of golf ball with a specific hardness distribution that results in high resilience performance and low spin rate when hit. This allows for a longer flight distance with a driver and better control with a short iron.

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

Experimental program
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Effect test

example 1

[0181]A rubber composition was obtained by kneading 100 parts by weight of a high-cis polybutadiene (trade name “BR-730”, manufactured by JSR Corporation), 34 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 35.40 mm. The amount of barium sulfate was adjusted such that the weight of a golf ball is 45.4 g.

[0182]A resin composition was obtained by kneading 52 parts by weight of an ionomer resin (the aforementioned “Himilan 1605”), 40 parts by weight of another ionomer resin (the aforementioned “Himilan AM7329”), 8 parts by weight of...

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Abstract

A golf ball 2 includes a spherical core 4, an inner mid layer 6 positioned outside the core 4, an outer mid layer 8 positioned outside the inner mid layer 6, a reinforcing layer 10 positioned outside the outer mid layer 8, and a cover 12 positioned outside the reinforcing layer 10. When distances (%) from a central point of the core 4 to nine points and JIS-C hardnesses at the nine points, which nine points are obtained by dividing a region from the central point of the core 4 to a surface of the core 4 at intervals of 12.5% of a 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.

Description

[0001]This application claims priority on Patent Application No. 2011-195635 filed in JAPAN on Sep. 8, 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, an inner mid layer, an outer 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 JP61-37178, JP2008-212681 ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A63B37/06A63B37/02B32B7/022
CPCC08K5/09B32B27/40A63B37/0092A63B37/0003A63B37/0031A63B37/0033A63B37/0044A63B37/0045A63B37/0062A63B37/0064A63B37/0096B32B7/02B32B25/08B32B25/16A63B37/0076B32B7/022A63B37/00622A63B37/00621A63B37/00922A63B37/00A63B37/06
Inventor MATSUYAMA, YOSHIKO
Owner DUNLOP SPORTS CO LTD
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