Bridgestone Sports Co., Ltd.

Bridgesotne Sports Co., Ltd.

Rinya Takesue

Yasushi Ichikawa

Shunichi Kashiwagi

Junji Hayashi

Hideo Watanabe

Hiroshi Higuchi

Hiroyuki Nagasawa

Eiji Takehana

Yasumasa Shimizu

Hirotaka Shimosaka

Junji Umezawa

Yoko Furuta

Atsuki Kasashima

Kunitoshi Ishihara

Toshihiko Manami

Nobuhiko Matsumura

Yasuharu Kawaguchi

Toshiaki Yamanaka

Hisashi Yamagishi

Jun Shindo

Akira Kawata

Kazuto Maehara

Nobuhiko Sato

Atsuki Kasahima

Yasush Ichikawa

In a golf ball composed of a core and a cover having a plurality of layers that encloses the core, at least a first layer of the cover is formed primarily of a heated mixture of (A) a metal ion neutralization product of an olefin-unsaturated carboxylic acid copolymer and/or a metal ion neutralization product of an olefin-unsaturated carboxylic acid-unsaturated carboxylic acid ester copolymer, (B) at least one type of olefin-unsaturated carboxylic acid copolymer and/or olefin-unsaturated carboxylic acid-unsaturated carboxylic acid ester copolymer having the same content of unsaturated carboxylic acid as component A, and (C) a thermoplastic polyurethane elastomer; and at least one other cover layer adjoining the at least first cover layer is formed primarily of a non-ionomeric thermoplastic elastomer. Because the golf ball is made using a cover stock having a good heat resistance, good moldability, good paint film adhesion and good adhesion to adjoining layers, it has an excellent rebound, an excellent feel when hit, and is more resistant to a decline in durability to impact.

Golf ball and method of manufacture

In the present invention, by optimizing the balance of Shore D hardness between the intermediate layer and the cover, the balance of Shore D hardness between the surface and the center in the core, the balance of initial velocity between the core and the sphere, and the balance of Deflection amount between the core and the sphere are optimized, and the total thickness of the intermediate layer and the cover, the inventive golf ball is given a good profile of rebound, feel, controllability and durability.

Multi-piece solid golf ball

A golf ball comprising a core, an intermediate layer, and a cover exhibits a good profile of rebound, feel and durability suited for low head speed amateur players when it satisfies the requirements that (Shore D hardness of the cover)&#x2212;(Shore D hardness of the intermediate layer)&#x3e;0, (initial velocity (in m/s) of the core enclosed with the intermediate layer)&#x2212;(initial velocity (in m/s) of the core)&#x3e;0, 0.90&#x2266;(Deflection amount of the core enclosed with the intermediate layer)/(Deflection amount of the core)&#x2266;1.00, and the total thickness (in mm) of the intermediate layer and the cover is up to 3.0 mm.

Golf ball

In a golf ball comprising a core and a cover, at least one layer of the cover is formed of a cover stock composition in which fullerene and/or carbon nanotubes are uniformly dispersed in a thermoplastic resin. The golf ball is prepared by uniformly dispersing fullerene and/or carbon nanotubes in a thermoplastic resin to provide a cover stock composition and forming at least one layer of the cover from the cover stock composition.

Golf ball and making method

A golf ball comprising a core having a Deflection amount of at least 3.0 mm and up to 6.0 mm, an intermediate layer, and a cover exhibits a good profile of rebound, feel and durability suited for low head speed amateur players when it satisfies the requirements that (Shore D hardness of the cover)&#x2212;(Shore D hardness of the intermediate layer)&#x3e;0, (initial velocity (in m/s) of the core enclosed with the intermediate layer)&#x2212;(initial velocity (in m/s) of the core)&#x3e;&#x2212;0.2, 0.90&#x2266;(Deflection amount of the core enclosed with the intermediate layer)/(Deflection amount of the core)&#x2266;1.00.

A golf ball comprising a core, an intermediate layer, and a cover exhibits a good profile of rebound, feel and durability suited for low head speed amateur players when it satisfies the requirements that (Shore D hardness of the cover)&#x2212;(Shore D hardness of the intermediate layer)&#x3e;0, (initial velocity (in m/s) of the core enclosed with the intermediate layer)&#x2212;(initial velocity (in m/s) of the core)&#x3e;&#x2212;0.2, 0.90&#x2266;(Deflection amount of the core enclosed with the intermediate layer)/(Deflection amount of the core)&#x2266;1.00.

A golf ball material comprises a heated mixture having a melt index of at least 1.0 dg/min, which mixture is composed of (A) a thermoplastic resin, (B) a fatty acid or fatty acid derivative having a molecular weight of at least 280, and (C) a basic inorganic metal compound capable of neutralizing acidic groups in components A and B. The material including a highly neutralized ionomer resin has good thermal stability, flow characteristics and moldability. The invention is also directed at high-rebound golf balls which can be easily and efficiently manufactured using the same material.

Golf ball materials and golf ball

A multi-piece solid golf ball exhibits a good profile of rebound, feel and durability suited for low head speed amateur players when it satisfies the requirements that (Shore D hardness of the cover)&#x2212;(Shore D hardness of the intermediate layer)&#x3e;0, (initial velocity (in m/s) of the core enclosed with the intermediate layer)&#x2212;(initial velocity (in m/s) of the core)&#x3e;&#x2212;0.2, 0.90&#x2266;(Deflection amount of the core enclosed with the intermediate layer)/(Deflection amount of the core)&#x2266;1.00, the total of the thickness of the intermediate layer and the thickness of the cover is up to 3.0 mm, and the ball has a coefficient of lift (CL) when hit of at least 0.165 at a Reynolds number of 70,000 and a spin rate of 2,000 rpm, and a coefficient of drag (CD) when hit of not more than 0.230 at a Reynolds number of 180,000 and a spin rate of 2,520 rpm.

In a golf ball comprising a core and a cover of one or more layers, at least one layer of the cover is formed primarily of a mixture comprising (A) an ionomer resin, (B) a thermoplastic elastomer and (C) a thermoplastic block copolymer terminated with a functional group capable of reacting with the ionomer resin, in such a proportion as to provide a A/(B+C) weight ratio between 50/50 and 98/2 and a B/C weight ratio between 9/1 and 1/1. The golf ball has improved rebound, a soft feel upon impact, good durability and good moldability.

The invention provides a golf ball comprising a core and a cover of one or more layers, characterized in that at least one layer which constitutes the cover is formed primarily of a mixture of (A) a thermoplastic resin composition selected from among a thermoplastic block copolymer, polyester base elastomer, polyamide base elastomer and polyolefin, which are modified with functional groups having reactivity with isocyanate, and (B) an isocyanate compound or an isocyanate mixture having at least two isocyanate groups as functional groups in a molecule, and a method for preparing the same. The golf ball has excellent flight performance, feel on impact, and scuff resistance.

Golf ball and method for preparing golf ball

The invention provides a golf ball comprising a core of at least one layer, a cover of at least one layer, and optionally an intermediate layer therebetween, characterized in that at least one layer of the core, cover and intermediate layer is formed of a golf ball-forming resin composition comprising, in admixture, (A) 100 parts by weight of a polyether ester block copolymer composed primarily of (a) high-melting crystalline polymer segments made of crystalline aromatic polyester units and (b) low-melting polymer segments made of aliphatic polyether units and (B) 0.05&#x2013;10 parts by weight of a polyisocyanate compound. Using the golf ball-forming resin composition which has flexibility and high rebound resilience and is fully wear resistant, the inventive golf ball is improved in travel distance, feel, scuff resistance and impact durability.

Golf Ball

A golf ball comprising a core, an intermediate layer, and a cover exhibits a good profile of rebound, feel and durability suited for low head speed amateur players when it satisfies the requirements that (Shore D hardness of the cover)&#x2212;(Shore D hardness of the intermediate layer)&#x3e;0, (initial velocity (in m/s) of the core enclosed with the intermediate layer)&#x2212;(initial velocity (in m/s) of the core) &#x3e;0, 0.90&#x2266;(Deflection amount of the core enclosed with the intermediate layer)/(Deflection amount of the core)&#x2266;1.00, and the total thickness (in mm) of the intermediate layer and the cover is up to 3.0 mm.

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Chichibu, Japan

Rinya Takesue