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Golf ball

a golf ball and ball technology, applied in the field of golf balls, can solve the problems of golf ball deformation, golf ball damage, golf ball deformation, etc., and achieve the effects of low spin rate, low energy loss, and low spin ra

Inactive Publication Date: 2013-12-05
DUNLOP SPORTS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to a golf ball with a specific hardness distribution that results in low energy loss and high flight distance when hit with a driver. The inner cover has a higher hardness than the outer cover, while the outer mid layer has a lower hardness than the inner mid layer. The hardness distribution is appropriate for achieving excellent controllability and durability. The golf ball also has a soft feel at impact and is easy to hit with a short iron. Overall, the technical effects of the present invention are improved performance and durability of the golf ball.

Problems solved by technology

In a golf ball that achieves a high trajectory by a high spin rate, a flight distance is insufficient.
When being hit with a driver or the like, a golf ball receives great shock and deforms.
When a local load is applied to a part of the ball due to the deformation, the golf ball is broken.
However, a golf ball having a low spin rate has inferior controllability.

Method used

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Experimental program
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Effect test

first embodiment

[0046]A golf ball 2 shown in FIG. 1 includes a spherical core 4, a mid layer 6 positioned outside the core 4, a reinforcing layer 8 positioned outside the mid layer 6, an inner cover 10 positioned outside the reinforcing layer 8, and an outer cover 12 positioned outside the inner cover 10. On the surface of the outer cover 12, a large number of dimples 14 are formed. Of the surface of the golf ball 2, a part other than the dimples 14 is a land 16. The golf ball 2 includes a paint layer and a mark layer on the external side of the outer cover 12, but these layers are not shown in the drawing.

[0047]The golf ball 2 has a diameter of 40 mm or greater but 45 mm or less. From the standpoint of conformity to the rules established by the United States Golf Association (USGA), the diameter is preferably equal to or greater than 42.67 mm. In light of suppression of air resistance, the diameter is preferably equal to or less than 44 mm and more preferably equal to or less than 42.80 mm. The go...

second embodiment

[0573]A golf ball 102 shown in FIG. 3 includes a spherical core 104, amid layer 106 positioned outside the core 104, a reinforcing layer 108 positioned outside the mid layer 106, an inner cover 110 positioned outside the reinforcing layer 108, and an outer cover 112 positioned outside the inner cover 110. On the surface of the outer cover 112, a large number of dimples 114 are formed. Of the surface of the golf ball 102, a part other than the dimples 114 is a land 116. The golf ball 102 includes a paint layer and a mark layer on the external side of the outer cover 112, but these layers are not shown in the drawing.

[0574]The golf ball 102 has a diameter of 40 mm or greater but 45 mm or less. From the standpoint of conformity to the rules established by the United States Golf Association (USGA), the diameter is preferably equal to or greater than 42.67 mm. In light of suppression of air resistance, the diameter is preferably equal to or less than 44 mm and more preferably equal to or...

third embodiment

[0659]A golf ball 202 shown in FIG. 5 includes a spherical core 204, an inner mid layer 206 positioned outside the core 204, an outer mid layer 208 positioned outside the inner mid layer 206, a reinforcing layer 210 positioned outside the outer mid layer 208, and a cover 212 positioned outside the reinforcing layer 210. The core 204 includes a spherical center 214 and an envelope layer 216 positioned outside the center 214. On the surface of the cover 212, a large number of dimples 217 are formed. Of the surface of the golf ball 202, a part other than the dimples 217 is a land 218. The golf ball 202 includes a paint layer and a mark layer on the external side of the cover 212, but these layers are not shown in the drawing.

[0660]The golf ball 202 has a diameter of 40 mm or greater but 45 mm or less. From the standpoint of conformity to the rules established by the United States Golf Association (USGA), the diameter is preferably equal to or greater than 42.67 mm. In light of suppress...

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Abstract

A golf ball 2 includes a core 4, a mid layer 6, a reinforcing layer 8, an inner cover 10, and an outer cover 12. The core 4 includes a center 18 and an envelope layer 20. The envelope layer 20 is formed by a rubber composition being crosslinked. The rubber composition includes a base rubber, a co-crosslinking agent, a crosslinking initiator, and an acid and / or a salt. The co-crosslinking agent is (1) an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms; and / or (2) a metal salt of an α,β-unsaturated carboxylic acid having 3 to 8 carbon atoms. A hardness Hc1 of the inner cover is greater than a hardness Hc2 of the outer cover. A thickness T1 of the inner cover is equal to or greater than 0.1 mm but equal to or less than 0.8 mm.

Description

[0001]This application claims priority on Patent Application No. 2012-122531 filed in JAPAN on May 29, 2012, Patent Application No. 2012-122543 filed in JAPAN on May 29, 2012, Patent Application No. 2012-122578 filed in JAPAN on May 30, 2012, and Patent Application No. 2012-122961 filed in JAPAN on May 30, 2012. The entire contents of these Japanese Patent Applications are hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to golf balls. Specifically, the present invention relates to golf balls that include a core, a mid layer, and a cover.[0004]2. Description of the Related Art[0005]Golf players' foremost requirement for golf balls is flight performance. In particular, golf players place importance on flight performance upon a shot with a driver. Flight performance correlates with the resilience performance of a golf ball. When a golf ball having excellent resilience performance is hit, the golf ball flies ...

Claims

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Application Information

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IPC IPC(8): A63B37/00
CPCA63B37/0054A63B37/0092A63B37/0031A63B37/0033A63B37/0039A63B37/0043A63B37/0045A63B37/005A63B37/0062A63B37/0072A63B37/0077A63B37/0095A63B37/00922C08K5/0025C08K5/09A63B37/0051A63B37/0076A63B37/0003A63B37/0032C08L21/00A63B37/02A63B37/06
Inventor TACHIBANA, KOSUKEISOGAWA, KAZUHIKO
Owner DUNLOP SPORTS CO LTD