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Golf ball

a golf ball and ball technology, applied in the field of golf balls, can solve the problems of reduced spin rate, easy curved trajectory of golf balls, small run, etc., and achieve the effects of suppressing golf ball slipping, great spin rate, and excellent durability

Inactive Publication Date: 2011-03-03
DUNLOP SPORTS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The present invention relates to a golf ball with a soft cover and paint layer that helps with spin performance and stability of spin rate. The paint layer is made of a soft polyurethane material that is excellent in durability. The cover is made of a soft material like polyurethane or ionomer resin, with a hardness of no greater than 61. The core of the golf ball has a soft mid layer and a center, with a compressive deformation of 1.8 mm or greater and 4.0 mm or less. The technical effects of this invention include improved spin performance, stability of spin rate, and durability of the golf ball."

Problems solved by technology

Great back spin rate results in small run.
Great side spin rate results in easily curved trajectory of the golf ball.
A shot accompanied by slipping results in reduced spin rate.
The flyer makes it difficult to predict the point of fall by the golf player.
Golf balls that are likely to result in a flyer are inferior in control performances.
However, a soft cover is greatly deformed upon shots.
When a cover is excessively deformed, a crack is generated on the paint layer.
Abrasion of the paint layer from the cover may be also caused.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0087]A rubber composition (1) was obtained by kneading 100 parts by weight of polybutadiene (“BR-730”, trade name, available from JSR Corporation), 38 parts by weight of zinc diacrylate, 5 parts by weight of zinc oxide, an adequate amount of barium sulfate, 0.5 parts by weight of diphenyl disulfide (Sumitomo Seika Chemicals Co., Ltd.) and 0.9 parts by weight of dicumyl peroxide (NOF Corporation). The amount of barium sulfate was adjusted such that the golf ball had a weight of 45.6 g. This rubber composition (1) was placed into a mold having upper and lower mold half each having a hemispherical cavity, and heated under a temperature of 170° C. for 20 minutes to obtain a center having a diameter of 39.7 mm.

[0088]A resin composition (a) was obtained by kneading 55 parts by weight of an ionomer resin (Surlyn® 8945, supra), 45 parts by weight of other ionomer resin (Himilan® AM7329, supra) and 4 parts by weight of titanium dioxide in a biaxial kneading extruder. This resin composition ...

examples 2 to 16

, and Comparative Examples 1 to 2

[0092]Golf balls of Examples 2 to 16, and Comparative Examples 1 to were obtained in a similar manner to Example 1 except that specifications of the center, the mid layer, the cover and the paint layer were as listed in Tables 4 and 5 below. The compositions of the center are presented in Table 1 below. The compositions of the mid layer and the cover are presented in Table 2 below. The compositions of the paint layer are presented in Table 3 below.

example 17

[0093]A rubber composition (3) was obtained by kneading 100 parts by weight of polybutadiene (BR-730, supra), 31 parts by weight of zinc diacrylate, 5 parts by weight of zinc oxide, an adequate amount of barium sulfate, 0.5 parts by weight of diphenyl disulfide (Sumitomo Seika Chemicals Co., Ltd.) and 0.9 parts by weight of dicumyl peroxide (NOF Corporation). The amount of barium sulfate was adjusted such that the golf ball had a weight of 45.6 g. This rubber composition (3) was placed into a mold having upper and lower mold half each having a hemispherical cavity, and heated under a temperature of 170° C. for 20 minutes to obtain a center having a diameter of 38.9 mm.

[0094]A resin composition (b) was obtained by kneading 35 parts by weight of an ionomer resin (Surlyn® 8945, supra), 34 parts by weight of other ionomer resin (Himilan® AM7329, supra), 31 parts by weight of a styrene block-containing thermoplastic elastomer (Rabalon® T3221C, supra) and 3 parts by weight of titanium dio...

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Abstract

Golf ball 2 has spherical core 4, cover 6 situated on the external side of the core 4, and paint layer 8 situated on the external side of the cover 6. The cover 6 has a Shore D hardness of no greater than 61. The paint layer 8 has a Martens hardness of no greater than 2.0 mgf / μm2. The base polymer of the paint layer 8 is a polyurethane obtained by a reaction of a polyol with a polyisocyanate. The polyisocyanate contains a buret-modified form of hexamethylene diisocyanate. The cover 6 has a thickness of 0.3 mm or greater and 1.0 mm or less. The paint layer 8 has a thickness of 5 μm or greater and 40 μm or less.

Description

[0001]This application claims priority on Patent Application No. 2009-194918 filed in Japan on Aug. 26, 2009, and Patent Application No. 2010-76562 filed in Japan on Mar. 30, 2010. 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 a golf ball having a core, a cover and a paint layer.[0004]2. Description of the Related Art[0005]General golf balls have a core, a cover situated on the external side of this core, and a paint layer situated on the external side of this cover. The paint layer protects the cover and a mark layer. The paint layer is also responsible for aesthetic appearance of the golf ball. In addition, the paint layer is also responsible for antifouling property of the golf ball. Japanese Unexamined Patent Application Publication No. 2000-84116 (US 2001 / 003717) disclose...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A63B37/02A63B37/12
CPCA63B37/0022A63B37/0087A63B37/0033A63B37/0043A63B37/0045A63B37/0062A63B37/0064A63B37/0065A63B37/0067A63B37/0075A63B2037/0079C08G18/7831C08G59/54C09D163/00C09D175/06A63B37/0023A63B37/0031A63B37/00221A63B37/00622A63B37/00222A63B37/00621
Inventor ISOAGAWA, KAZUHIKOOHAMA, KEIJIMATSUYAMA, YOSHIKOENDO, SEIICHIRO
Owner DUNLOP SPORTS CO LTD
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