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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 compatibility of ionomer resins with other resins, and insufficient adhesion between the mid layer and the cover, so as to optimize the launch angle of the golf ball upon impact, the resilience performance of the golf ball, and the effect of sufficient durability

Inactive Publication Date: 2006-09-21
DUNLOP SPORTS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0015] In this golf ball, firm adhesion between the mid layer and the cover is permitted via the reinforcing layer. According to this golf ball, sufficient durability is achieved by virtue of the reinforcing layer even though a thin mid layer or a thin cover is employed. The thin mid layer can be responsible for resilience performance of the golf ball. The thin cover can be responsible for feel at impact of the golf ball. Also, the thin cover can optimize launch angle of the golf ball upon impact. This golf ball is excellent in the flight performance, feel at impact and durability.

Problems solved by technology

Ionomer resins are inferior in compatibility with other resins.
Ionomer resins are particularly inferior in compatibility with thermoplastic elastomers.
In golf balls having a cover comprising an ionomer resin and a mid layer comprising other resin, adhesion between the mid layer and the cover may be insufficient.
In this type of golf ball, repeated impacts may result in detachment of the cover from the mid layer.
The detachment leads to breakage of the golf ball.
In particular, according to golf balls having a thin mid layer or a thin cover, breakage is apt to be caused due to insufficient adhesion.

Method used

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Examples

Experimental program
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Effect test

experiment 1

Example 1

[0084] A type x rubber composition was obtained by kneading 100 parts by weight of high cis-polybutadiene (tradename “BR-730”, available from JSR Corporation), 25 parts by weight of zinc acrylate, 10 parts of zinc oxide, an adequate amount of barium sulfate, 0.5 part by weight of diphenyl disulfide (manufactured by Sumitomo Seika Chemicals Co., Ltd.) and 0.8 part by weight of dicumyl peroxide (manufactured by NOF Corporation). This rubber composition was placed into a mold having upper and lower mold half each having a hemispherical cavity, and heated at 170° C. for 20 minutes to obtain a core having a diameter of 39.2 mm.

[0085] In a biaxial extruder having a screw diameter of 45 mm, which provides a rotational velocity of the screw being 200 rpm, and having L / D of 35, a type b resin composition shown in Table 1 below was obtained. Temperature in the die during extrusion of the resin composition was from 180° C. to 230° C. The core was covered by this resin composition th...

examples 3 to 4

[0088] In a similar manner to Example 1 except that the diameter of the core and the thickness of the mid layer were as listed in Table 3 below, golf balls of Examples 3 to 4 were obtained.

examples 2 , 5 and 6

Examples 2, 5 and 6, and Comparative Example 1

[0089] In a similar manner to Example 1 except that the type of the resin composition of the mid layer was as listed in Table 3 below, golf balls of Examples 2, 5 and 6, and Comparative Example 1 were obtained. Details of the resin composition are shown in Table 2 below.

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PUM

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Abstract

Golf ball 2 has a spherical core 4, a mid layer 6 covering this core 4, a reinforcing layer 8 covering this mid layer 6, and a cover 10 covering this reinforcing layer 8. Base polymer of the mid layer 6 includes a styrene block-containing thermoplastic elastomer and an ionomer resin. The mid layer 6 has a hardness as measured with a Shore D type hardness scale of equal to or less than 54. The mid layer 6 has a thickness of 0.5 mm or greater and 1.6 mm or less. Base polymer of the reinforcing layer 8 is a reaction product between carboxyl group-containing polyurethane and polycarbodiimide. Principal component of the base polymer of the cover 10 is an ionomer resin. The cover 10 has a hardness as measured with a Shore D type hardness scale hardness of equal to or greater than 55. The cover 10 has a thickness of equal to or less than 1.2 mm.

Description

[0001] This application claims priority on Patent Application No. 2005-73295 filed in JAPAN on Mar. 15, 2005 and Patent Application No. 2005-76551 filed in JAPAN on Mar. 17, 2005. The entire contents of these Japanese Patent Applications are hereby incorporated by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to golf balls. More particularly, the present invention relates to multi piece golf balls having a core, a mid layer and a cover. [0004] 2. Description of the Related Art [0005] Top concern to golf players for golf balls is their flight performances. The golf players particularly place great importance on flight distance attained upon shots with a driver. Feel at impact is also important to golf balls. Golf players prefer soft feel at impact. Furthermore, durability is also important to golf balls. Golf balls not accompanied by breakage upon repeated impacts have been desired. [0006] In light of flight performances ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A63B37/04A63B37/14
CPCA63B37/0031A63B37/0033A63B37/0043A63B37/0045A63B37/0076
Inventor ISOGAWA, KAZUHIKOOHAMA, KEIJI
Owner DUNLOP SPORTS CO LTD