Golf ball

a technology of golf balls and balls, applied in the field of golf balls, can solve the problems of increased rate and decreased flight distance, and achieve the effect of superior spin stability
US20090105012A1Inactive Publication Date: 2009-04-23DUNLOP SPORTS CO LTD
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
DUNLOP SPORTS CO LTD
Publication Date
2009-04-23
Estimated Expiration
Not applicable · inactive patent

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Abstract

Golf ball 2 of the present invention has core 4, cover 10 situated on the external side of the core 4, and paint layer provided to cover this cover 10. The base polymer of the cover 10 is a urethane resin. The base polymer of the paint layer 16 is a urethane resin. The cover 10 has a thickness Tc of 0.1 mm or greater and 0.7 mm or less. The paint layer 16 has a thickness Tp (mm) of 0.015 mm or greater and 0.040 mm or less. The ratio (Tp / Tc) is 0.021 or greater and 0.40 or less. Preferably, the paint layer 16 is formed with two or more layers 18 and 20. Preferably, the base polymer of the paint layer 16 is a two-pack type urethane resin or a two-pack type epoxy resin.
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Description

[0001] This application claims priority on Patent Application No. 2007-274682 filed in JAPAN on Oct. 23, 2007. 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.

[0004] 2. Description of the Related Art

[0005] For golf balls, in addition to flight performances, approach performances and spin stability have been demanded. Golf balls having favorable approach performances are accompanied by a great backspin rate upon approach shots. Golf balls that are superior in the spin stability are less likely to be accompanied by variance of the backspin rate. In the golf balls that are superior in spin stability, for example, the difference between dry spin rate Sd and wet spin rate Sw is small. The ratio (Sw / Sd) is also referred to as spin retention, which has been employed as a marker of the spin stability. In particular, high-level golf players ten...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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