Sri Sports Limited

Sumitomo Rubber Industries Limited

Dunlop Sports Company Limited

Keiji Ohama

Takahiro Sajima

Seiichiro Endo

Hirotaka Nakamura

Kazuya Kamino

Toshiyuki Tarao

Kazuhiko Isogawa

Kazuyoshi Shiga

Keiji Moriyama

Satoko Okabe

Kazunari Yoshida

Satoshi Iwami

Takashi Sasaki

Yoshiko Matsuyama

Masatoshi Yokota

Kosuke Tachibana

Hidenori Hiraoka

Kazuhiko Isoagawa

Takahiro Shigemitsu

Koichi Fujisawa

Takeshi Asakura

Takumi Nishino

An object of the present invention is to provide a golf ball having a high performance as well as the visibility and the fashionable appearance. The present invention provides a colored golf ball having a color other than white and comprising: a core having a center and at least one intermediate layer disposed around the center, and a cover disposed around the core, wherein the cover and at least one of the intermediate layer preferably contain a fluorescent dye and/or a fluorescent pigment.

Colored golf ball

Golf ballof the present invention has core, coversituated on the external side of the core, and paint layerprovided to cover this cover. The base polymer of the coveris a urethane resin. The base polymer of the paint layeris a urethane resin. The coverhas a thickness Tc of 0.1 mm or greater and 0.7 mm or less. The paint layerhas a thickness Tp (mm) of 0.015 mm or greater and 0.040 mm or less. The ratio (Tp/Tc) is 0.021 or greater and 0.40 or less. Preferably, the paint layeris formed with two or more layersand. Preferably, the base polymer of the paint layeris a two-pack type urethane resin or a two-pack type epoxy resin.

Golf ball

An object of the present invention is to provide a golf ball providing a great distance. Another object of the present invention is to provide a golf ball striking a balance between a flight distance on a driver shot and an approach performance on an approach shot while providing an excellent shot feeling. The present invention provides a golf ball comprising: a center, a cover and at least one intermediate layer disposed between the center and the cover, wherein at least one piece or one layer of the intermediate layer is formed from a high fluidity intermediate layer composition that contains (A) a polyamide resin composition having a flexural modulus in a range from 700 MPa to 4,000 MPa; (B) at least one member selected from the group consisting of an ethylene-(meth)acrylic acid binary copolymer, a metal-neutralized product of the binary copolymer, an ethylene-(meth)acrylic acid-(meth)acrylic acid ester ternary copolymer, and a metal-neutralized product of the ternary copolymer, and (C) a fluidity improving agent.

Golf ball and process for preparing the same

An object of the present invention is to provide a novel golf ball material that controls the spin rate on the approach shots while suppressing the change in the spin rate on the driver shots. Another object of the present invention is to provide a golf ball which produces a high spin rate on the approach shots and a low spin rate on the driver shots. The present invention provides a golf ball resin composition comprising: a polyurethane having a polyol component having a number average molecular weight from 200 to 1,500 as a constituting component.

Golf ball resin composition and golf ball using the same

A golf ballincludes a core, an envelope layerpositioned outside the core, a mid layerpositioned outside the envelope layer, and a coverpositioned outside the mid layer. The coreincludes a spherical centerand a core outer layerpositioned outside the center. The centerhas a diameter of 1 mm or greater and 15 mm or less. The difference (H4&#x2212;H3) between the JIS-C hardness H4 of the coreat its surface and the JIS-C hardness H3 of the core outer layerat its innermost portion is equal to or greater than 10. The coverhas a Shore D hardness H7 less than 40. The Shore D hardnesses H5, H6 and H7 of the envelope layer, the mid layer, and the coversatisfy that H5&#x3e;H6&#x2267;H7.

A golf ballhas a spherical coreand a coverpositioned outside this core. The corehas a spherical centerand a mid layerpositioned outside this center. The centeris formed by crosslinking a rubber composition. A base rubber of the rubber composition contains polybutadiene as a principal component. The rubber composition contains sulfur as a crosslinking agent. The centerhas a diameter of 1 mm or greater and 15 mm or less. The centerhas a central hardness H1 of 20 or greater and 50 or less. A difference (H4&#x2212;H3) between a hardness H4 of a surface of the mid layerand a hardness of an innermost part thereof is equal to or greater than 10.

An object of the present invention is to provide a golf ball having an excellent properties like flight distance and low temperature durability. The present invention provides a golf ball comprising: a core consisting of a center and one or more intermediate layers covering the center; and a cover covering the core, wherein at least one piece or one layer of said intermediate layers is formed from a highly elastic intermediate layer composition that contains (A) a highly elastic polyamide resin having a flexural modulus in a range from 700 MPa to 5,000 MPa; (B) a metal-neutralized product of ethylene-(meth)acrylic acid copolymer and (C) a resin having a polar functional group in a specific way.

Golf ballhas spherical core, coversituated on the external side of the core, and paint layersituated on the external side of the cover. The coverhas a Shore D hardness of no greater than 61. The paint layerhas a Martens hardness of no greater than 2.0 mgf/&#x3bc;m. The base polymer of the paint layeris a polyurethane obtained by a reaction of a polyol with a polyisocyanate. The polyisocyanate contains a buret-modified form of hexamethylene diisocyanate. The coverhas a thickness of 0.3 mm or greater and 1.0 mm or less. The paint layerhas a thickness of 5 &#x3bc;m or greater and 40 &#x3bc;m or less.

A golf ballhas a core, an inner coverpositioned outside this coreand an outer coverpositioned outside the inner cover. The corehas a spherical centerand a mid layerpositioned outside this center. The centeris formed by crosslinking a rubber composition. The mid layeris formed by crosslinking a rubber composition. The inner coveris made of a thermoplastic resin composition. The outer coveris made of a thermoplastic resin composition. The centerhas a diameter of 1 mm or greater and 15 mm or less. The centerhas a central point having JIS-C hardness Hof 20 or greater and 50 or less. A difference (H&#x2212;H) between a hardness Hof a surface of the core and a hardness Hof an innermost part of the mid layer is equal to or greater than 10. A hardness Hof the inner cover is smaller than a hardness Hof the outer cover.

An object of the present invention is to provide a golf ball which travels a great distance on the driver shots and stops quickly on the green on the approach shots. The present invention is directed to a golf ball material having a shear loss modulus G&#x2033; of 2.11&#xd7;10Pa or less, and a ratio (E&#x2033;/G&#x2033;) of a tensile loss modulus E&#x2033; to the shear loss modulus G&#x2033; of 1.78 or more, when measuring the shear loss modulus G&#x2033; in a shear mode and the tensile loss modulus E&#x2033; in a tensile mode at conditions of a temperature of 0&#xb0; C., oscillation frequency of 10 Hz using a dynamic viscoelasticity measuring apparatus.

Golf ball material and golf ball using the same

A golf ballincludes a core, a mid layer, and a cover. The coreincludes a centerand an envelope layer. The ratio (Do/De) of an amount of compressive deformation Do of the centerto an amount of compressive deformation De of the coreis equal to or greater than 1.5 but equal to or less than 2.5. The ratio (Do/Dc) of the amount of compressive deformation Do of the centerto an amount of compressive deformation Dc of the golf ballis equal to or greater than 1.8. The diameter of the centeris equal to or less than 20 mm. The difference (He&#x2212;Ho) between a surface hardness He of the coreand a central hardness Ho of the centeris equal to or less than 40.

An object of the present invention is to provide a golf ball which has an increased dry spin rate and wet spin rate on approach shots without sacrificing the processability into the cover. The present invention provides a golf ball cover material having shear loss moduli G1&#x2033; (Pa), G2&#x2033; (Pa), and G3&#x2033; (Pa) that satisfy following equations when measured using a dynamic viscoelasticity measuring apparatus at following conditions.log G1&#x2033;&#x2266;7.09&#x2003;&#x2003;(1)log G2&#x2033;&#x2267;7.17&#x2003;&#x2003;(2)log G3&#x2033;&#x2266;7.14&#x2003;&#x2003;(3)

Golf ball cover material and golf ball using the same

A golf ballincludes a spherical core, a mid layeroutside the core, and a coveroutside the mid layer. The coreincludes a spherical centerand an envelope layeroutside the center. At all points P included in a zone that extends over a distance range from equal to or greater than 1 mm to equal to or less than 15 mm from the central point of the core, the following mathematical formula is satisfied.&#x2212;5&#x3c;2&#x2212;1&#x3c;5 In the mathematical formula, Hindicates the JIS-C hardness at a point Plocated radially inward of each point P at a distance of 1 mm from the point P, and Hindicates the JIS-C hardness at a point Plocated radially outward of each point P at a distance of 1 mm from the point P.

The object of the present invention is to provide a golf ball that satisfies both of the flight distance at the shot with a driver, a long iron, and a middle iron and the controllability at the approach shot with a short iron and is also excellent in the abrasion resistance of the cover. The present invention provides a golf ball comprising a core consisting of a center and at least one intermediate layer covering the center, and a cover covering the core, wherein the cover is formed from a cover composition containing, as a resin component, a thermoplastic polyurethane (A) and a polyisocyanate mixture (B) in which a urethane prepolymer (b-1) having at least two isocyanate groups or a polyisocyanate (b-2) having at least three isocyanate groups is dispersed in a thermoplastic resin (b-3) which does not substantially react with an isocyanate group; and wherein the cover composition has a slab hardness of 60 or less in Shore D hardness, and the core has a hardness difference (Hs&#x2212;Ho) between a surface hardness Hs and a center hardness Ho of from 15 to 50 in Shore D hardness.

Growing community of inventors

Kobe, Japan

Keiji Ohama