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Golf ball

a technology of golf balls and balls, applied in the field of golf balls, can solve the problems of reducing the control of the ball, and reducing the ability of the player to intentionally control the spin of the ball, so as to improve the resilience of the outer cor

Inactive Publication Date: 2005-03-17
ACUSHNET CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is about a new kind of golf ball with a specific moment of inertia and a resilient zone. It also has a thin cover with no filler or very little filler. The ball has a high density inner core and an outer core that contains substantially no filler. The inner core has a high specific gravity filler incorporated in a polymeric matrix or a metal sphere. The outer core is made of a thin dense layer or a multi-layer core with high specific gravity. The ball also has a thin dense layer encasing a core or a multi-layer core with substantially no filler. The invention provides a golf ball with improved performance and feel.

Problems solved by technology

On the other hand, the recreational players who cannot intentionally control the spin of the ball generally do not prefer a high spin rate golf ball.
When a club head strikes a ball improperly, an unintentional side spin is often imparted to the ball, which sends the ball off its intended course.
The side spin reduces a player's control over the ball, as well as the direct-line distance the ball will travel.
However, the addition of fillers may adversely interfere with the inherent resiliency of the polymers used in golf balls and thereby the coefficient of restitution of the golf balls.

Method used

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Experimental program
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first embodiment

[0065] In a first embodiment the inner and outer cover layers are disclosed in U.S. Pat. No. 5,885,172, which is incorporated herein by reference in its entirety. The outer cover layer 18 is preferably formed from a relatively soft thermoset material in order to replicate the soft feel and high spin play characteristics of a balata ball when the balls of the present invention are used for pitch and other “short game” shots. In particular, the outer cover layer should have a Shore D hardness of from less than about 65 or about 30 to about 60, preferably about 35 to about 50 and most preferably about 40 to about 45. Hardness is preferably measured pursuant to ASTM D-2240 in either button or slab form. Additionally, the materials of the outer cover layer must have a degree of abrasion resistance in order to be suitable for use as a golf ball cover.

[0066] The outer cover layer of the present invention can comprise any suitable thermoset material, which is formed from a castable reactive...

second embodiment

[0074] In a second embodiment, a multi-layer cover formed by a sandwich injection molding process, wherein said cover comprises three layers: an inner layer and an outer layer of a first material and an intermediate layer therebetween of a second material. As illustrated in FIG. 3, a sandwich cover 26 comprising outer cover layer 28, inner cover layer 30 and intermediate cover layer 32. The sandwich injection molding process for forming a multi-layer golf ball cover includes the steps of pushing a measured amount of a first plasticized material into one end of an accumulation cylinder, pushing a measured amount of a second plasticized material into the opposite end of the accumulation cylinder, and injecting both materials in a single plunging step, so that the first material substantially coats the surface of the mold while the second material substantially fills the interior of the first material. The first plasticized material cools and solidifies when coming into contact with th...

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Abstract

A high CoR golf ball having predetermined moment of inertia is provided. A portion of the golf ball preferably contains substantially no filler, which contributes to the increased resilience of the ball. In accordance to one aspect of the invention, the portion with substantially no filler is an intermediate layer of the ball, and preferably is the outer core layer of the ball. The remaining portions of the ball preferably contribute to the moment of inertia of the ball. To craft a low moment of inertia ball, the innermost core should have a high specific gravity. Additionally, the outermost layers of the ball may have a low specific gravity. Conversely, to craft a high moment of inertia ball, the ball should have a thin dense layer positioned radially outward from its centroid radius. Additionally, the innermost core may have a low specific gravity. To craft a mid range moment of inertia ball, the ball may comprise a high specific gravity inner core and a thin dense layer. Preferably, the portion with substantially no filler is relatively larger than other portions of the ball.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application is a divisional of co-pending application Ser. No. 10 / 157,679, entitled “Golf Ball” and filed on May 29, 2002, which is a continuation-in-part of application Ser. No. 09 / 842,574, which was filed on Apr. 26, 2001 and issued as U.S. Pat. No. 6,533,682, which is a continuation-in-part of application Ser. No. 09 / 815,753, which was filed on Mar. 23, 2001 and issued as U.S. Pat. No. 6,494,795. The disclosures of the parent applications are incorporated herein by reference in their entireties.FIELD OF THE INVENTION [0002] The present invention relates to golf balls and more particularly, the invention is directed to golf balls with improved coefficient of restitution and spin rate. BACKGROUND OF THE INVENTION [0003] The spin rate of golf balls is the end result of many variables, one of which is the distribution of the density or specific gravity within the ball. Spin rate is an important characteristic of golf balls for both ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A63B37/00A63B37/02A63B37/04A63B37/12B29C43/30
CPCA63B37/0003B29K2105/256A63B37/0031A63B37/0033A63B37/0035A63B37/0045A63B37/0047A63B37/0052A63B37/0056A63B37/0064A63B37/0065A63B37/0066A63B37/0076A63B37/0091A63B37/0097A63B37/02A63B37/04A63B2209/00B29C43/305B29C2043/3644A63B37/0024
Inventor SULLIVAN, MICHAEL J.LADD, DEREK A.DESIMAS, ANTONIO U.
Owner ACUSHNET CO