Golf ball

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.

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...

AI Technical Summary

Benefits of technology

[0007]Specifications of the cover can affect the performances of the golf ball. Suitable covers that provide superior the approach performance and spin stability, and also scuff resistance include a polyurethane resin as a base polymer (urethane cover). However, when the thickness of the urethane cover is too large, the backspin rate is increased upon shots with a driver, whereby the flight distance is likely to be decreased. In light of the flight distance upon shots with a driver, it is preferred to minimize the thickness of the urethane cover.

[0009]It was revealed that the spin stability upon approach shots and the flight performance upon shots with a driver can be improved by appropriately defining the relationship between the urethane cover and the paint layer.

[0010]An object of the present invention is to provide a golf ball which can achieve both the spin stability upon approach shots, and the flight distance upon shots with a driver.

[0017]Accordingly, golf balls that are superior in spin stability upon approach shots and flight distance upon shots with a driver.

Problems solved by technology

However, when the thickness of the urethane cover is too large, the backspin rate is increased upon shots with a driver, whereby the flight distance is likely to be decreased.

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