Multi-piece solid golf ball

a golf ball and golf technology, applied in the field of multi-piece solid golf balls, can solve the problems of unanticipated effects, and achieve the effect of excellent scuff resistance, satisfactory flight performance and controllability

Inactive Publication Date: 2009-04-30
BRIDGESTONE SPORTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008]It is therefore an object of the present invention to provide a golf ball which has a satisfactory flight performance and controllability when used by professionals and other skilled golfers, is able in particular to maintain a straight trajectory on full shots, and has an excellent scuff resistance.

Problems solved by technology

Such a combination of effects was entirely unanticipated.

Method used

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Examples

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Effect test

examples

[0138]Examples of the invention and Comparative Examples are given below by way of illustration, and not by way of limitation.

examples 1 and 2

, Comparative Examples 1 to 5

Formation of Core

[0139]Rubber compositions were formulated as shown in Tables 1 and 2, then molded and vulcanized at 155° C. for 15 minutes to form an inner core layer and an outer core layer. That is, the rubber composition for an inner core layer shown in Table 1 was prepared and vulcanized, following which the resulting inner core layer was enveloped by an outer core layer made of the material shown in Table 2 in an unvulcanized state, and the resulting sphere was molded and vulcanized to give a two-layer construction.

TABLE 1ExampleComparative ExampleRubber formulation1212345InnerPolybutadiene100100100100100100100core layerZinc acrylate172234.526.7222222formulationPeroxide1.21.21.21.21.21.21.2Antioxidant0.10.10.10.10.10.10.1Zinc oxide34.632.827.632432.830.132.8Zinc salt of2.52.5112.52.52.5pentachlorothiophenolZinc stearate5505555VulcanizationTemperature (° C.)155155155155155155155Time (min)15151515151515

TABLE 2ExampleComparative ExampleRubber formulat...

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PUM

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Abstract

The present invention provides a multi-piece solid golf ball having a core, an envelope layer encasing the core, an intermediate layer encasing the envelope layer, and a cover which encases the intermediate layer and has formed on a surface thereof a plurality of dimples. The core is composed overall of an inner layer and an outer layer which are each formed primarily of a rubber material, with the outer core layer being harder than the inner core layer. The envelope layer, intermediate layer and cover have respective thicknesses which satisfy the condition: cover thickness<intermediate layer thickness<envelope layer thickness, and have respective material hardnesses (Shore D hardness) which satisfy the condition: envelope layer material hardness<intermediate layer material hardness>cover material hardness. The golf ball has a lower spin rate on full shots with a driver, further increasing the distance traveled by the ball. Moreover, it has a good controllability, maintaining in particular a straight trajectory on full shots, and also has an excellent scuff resistance.

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates to a multi-piece solid golf ball composed of a core, an envelope layer, an intermediate layer and a cover that have been formed as successive layers. More specifically, the invention relates to a multi-piece solid golf ball which has a satisfactory flight performance and controllability when used by professionals and other skilled golfers, is able in particular to maintain a straight trajectory on full shots, and has an excellent scuff resistance.[0002]A variety of golf balls have hitherto been developed for professionals and other skilled golfers. Of these, multi-piece solid golf balls in which the hardness relationships among layers encasing the core, such as an intermediate layer and a cover layer, have been optimized are in wide use because they achieve both a superior distance in the high head speed range and good controllability on shots taken with an iron and on approach shots. Another important concern is the pro...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A63B37/00
CPCA63B37/0004A63B37/0096A63B37/0031A63B37/0033A63B37/0039A63B37/0043A63B37/0045A63B37/0062A63B37/0065A63B37/0076A63B37/0081A63B37/0087A63B37/0092A63B37/0095A63B37/0024A63B37/00622A63B37/00621A63B37/00922
Inventor WATANABE, HIDEOKIMURA, AKIRA
Owner BRIDGESTONE SPORTS
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