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Golf ball

a golf ball and ball technology, applied in the field of golf balls, can solve the problems of low ball initial velocity and poor scuff resistance, the overall performance of the golf ball thereby obtained tends to decline, and the initial velocity of the golf ball tends to decline, so as to achieve excellent flight performance and satisfactory impact and scuff

Inactive Publication Date: 2008-01-31
BRIDGESTONE SPORTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006]It is therefore an object of the invention to provide a golf ball which, in addition to exhibiting an excellent flight performance, also has a more than satisfactory feel on impact and scuff resistance.

Problems solved by technology

However, the admixture of oleic acid with this terpolymer makes the resulting material too soft for use in golf balls, leading to such undesirable effects as a low ball initial velocity and a poor scuff resistance.
U.S. Pat. No. 6,762,246 teaches a material obtained by mixing a low-molecular-weight compound such as a wax with a ternary ionomer, but the overall performance of golf balls thereby obtained tends to decline.
However, when a low-hardness ionomer is used, the initial velocity of the ball tends to decline and the scuff resistance tends to worsen.

Method used

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Examples

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examples

[0052]Examples of the invention and Comparative Examples are given below by way of illustration, and not by way of limitation.

examples 1 to 6

, Comparative Examples 1 to 4

[0053]Using a core material composed primarily of the polybutadiene shown in Table 1 below, a solid core with a diameter of 35.3 mm, a weight of 27.1 g, and a deflection under 100 kg of loading of 4.0 mm was produced. The deflection was the measured amount of deformation by the core when compressed under a final load of 1,275 N (130 kgf) from an initial load of 98 N (10 kgf).

TABLE 1Amount (pbw)CorePolybutadiene (1)50formulationPolybutadiene (2)50Zinc acrylate24.0Peroxide (1)0.6Peroxide (2)0.6Antioxidant0.1Zinc salt of pentachlorothiophenol0.1Zinc oxide5Barium sulfate20.8CoreDiameter (mm)35.3propertiesWeight (g)27.1Deflection (mm)4.0

[0054]Details of the above formulation are provided below.[0055]Butadiene rubber (1): BR01 (trade name), available from JSR Corporation.[0056]Butadiene rubber (2): BR51 (trade name), a grade of BR730 having improved extrudability available from JSR Corporation.[0057]Peroxide (1): Dicumyl peroxide, available from NOF Corporatio...

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Abstract

The invention provides a golf ball having a core and a cover of one or more layer, wherein at least one layer of the cover is made of a material obtained by molding a mixture of (a) a metal ion neutralization product of an olefin-unsaturated carboxylic acid random copolymer having a Shore D hardness of at least 60; (b) an unsaturated fatty acid; and (c) a basic inorganic metal compound capable of neutralizing acid groups in components (a) and (b). The golf ball has both a good feel on impact and excellent scuff resistance while retaining a good flight performance.

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates to a golf ball having a core and cover of one or more layer. More specifically, the invention relates to a golf ball having both a good feel on impact and excellent scuff resistance while retaining a good flight performance.[0002]In recent years, ionomer resins have been widely used in golf ball cover materials. Ionomer resins are ionic copolymers of an olefin such as ethylene with an unsaturated carboxylic acid such as acrylic acid, methacrylic acid or maleic acid, in which some of the acidic groups are neutralized with metal ions such as sodium, lithium, zinc or magnesium. In particular, ionomer resins have excellent characteristics such as durability and rebound resilience, and are thus well-suited for use as the base resin in a golf ball cover material.[0003]Ionomer resins account for most of the cover material resin in use today, and enable the production of golf balls endowed with the above properties. Yet, golfers...

Claims

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Application Information

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IPC IPC(8): A63B37/04A63B37/06A63B37/14
CPCA63B37/0003C08L23/0876A63B37/0031A63B37/0023A63B37/0074
Inventor MANAMI, TOSHIHIKOTAKEHANA, EIJI
Owner BRIDGESTONE SPORTS