Sumitomo Rubber Industries Limited

Dunlop Sports Company Limited

Dunlap Sports Co. Ltd.

Hidetaka Inoue

Takahiro Sajima

Toshiyuki Tarao

Kuniyasu Horiuchi

Kazuya Kamino

Mami Tanaka

Kazuyoshi Shiga

Takahiro Shigemitsu

Hiroshi Hasegawa

Chiemi Mikura

Hitoshi Oyama

Sho Goji

Kuniyuki Nishikawa

Kosuke Tachibana

Kohei Mimura

Kazumi Kodama

Keiichi Hattori

Kotaro Ryuo

Seiji Hayase

Hikaru Nagakura

Hironori Takihara

Kai Hayashi

Mariko Hashinokuchi

Kaita Fukao

An object of the present disclosure is to provide a golf ball having excellent flight distance on driver shots and good spin rate on middle iron shots. The present disclosure provides a golf ball comprising a spherical core and a cover, wherein a hardness difference (C1−C0), a hardness difference (C2−C1), a hardness difference (C3−C2) and a hardness difference (C4−C3) are more than 0 and 6.0 or less, a hardness difference (C5−C4) is 5.0 or more, and a hardness difference (C6−C5), a hardness difference (C7−C6) and a hardness difference (C8−C7) are more than 0 and 3.5 or less where C0 (center), C1, C2, C3, C4, C5, C6, C7 and C8 (surface) are a Shore C hardness at each point from the center obtained by dividing a radius of the spherical core into equal eight parts.

Golf ball

An object of the present invention is to provide a golf ball having excellent spin performance on approach shots under a wet condition and excellent spin performance on approach shots under a condition that there is grass between the golf ball and the dub face. The present invention provides a golf ball comprising a golf ball body and a paint film composed of at least one layer and formed on a surface of the golf ball body, wherein an outermost layer of the paint film located at the outermost layer of the golf ball contains a base resin and a porous filler, the base resin contains a polyurethane obtained by a reaction between (A) a polyisocyanate composition and (B) a polyol composition containing a urethane polyol as a polyol component, the porous filler contains SiOin an amount of 50 mass % or more as a constituent component, and a loss tangent (tan δ) of the outermost layer of the paint film measured with a dynamic viscoelasticity measuring apparatus under following conditions has a peak temperature in a range of from −43° C. to 40° C.

An object of the present invention is to provide a golf ball having excellent spin performance on approach shots under a wet condition and excellent spin performance on approach shots under a condition that there is grass between the golf ball and the club face. The present invention provides a golf ball comprising a golf ball body and a paint film composed of at least one layer and formed on a surface of the golf ball body, wherein an outermost layer of the paint film located at the outermost layer of the golf ball contains a base resin and a porous filler, the base resin contains a polyurethane obtained by a reaction between a polyisocyanate composition and a polyol composition, and the porous filler contains SiOin an amount of 50 mass % or more as a constituent component.

A golf ballincludes a main bodyand a paint layerpositioned outside the main body. The main bodyincludes a spherical core, a mid layerpositioned outside the core, and a coverpositioned outside the mid layer. An indentation depth, measured when the paint layerin a cross-section along a plane passing through a central point of the golf ballis pressed by a force of 30 mgf in a direction perpendicular to the cross-section, is not less than 300 nm and not greater than 3000 nm. The paint layerpreferably has a thickness of not less than 5 &#x3bc;m and not greater than 50 &#x3bc;m.

An object of the present invention is to provide a golf ball having improved ball speed or aerodynamic performance on a rainy day or the like by controlling the formulation of the paint film. The present invention provides a golf ball comprising a golf ball body and a paint film covering the golf ball body, wherein a paint film surface of the golf ball has a water contact angle A1 of 70&#xb0; or more and a water sliding angle B1 of less than 50&#xb0;. The present invention also provides a golf ball comprising a golf ball body and a paint film covering the golf ball body, wherein when a sheet consisting of a slab formed from a composition constituting a golf ball body surface and a coating film formed by applying a paint constituting the paint film on the slab is prepared, a coating film surface of the sheet has a water contact angle A2 of 90&#xb0; or more and a water sliding angle B2 of less than 52&#xb0;.

An object of the present invention is to provide a golf ball travelling a great flight distance on driver shots on a rainy day or the like and having excellent spin performance on approach shots. The present invention provides a golf ball comprising a golf ball body and a paint film covering the golf ball body and composed of at least one layer, wherein an outermost layer of the paint film is formed from a paint containing a curable silicone resin, a curing catalyst, and a reactive silicone oil.

An object of the present invention is to provide a golf ball travelling a great flight distance on driver shots on a rainy day and having excellent spin performance on approach shots. The present invention provides a golf ball comprising a golf ball body and a paint film covering the golf ball body and composed of at least one layer, wherein an outermost layer of the paint film is formed from a paint containing a polyol, a polyisocyanate, and a carbinol modified silicone oil different from the polyol compound.

A golf ball includes a core, a mid layer, and a cover. A ratio Rcalculated by mathematical formula (1): R=(Df&#x2212;Df)/(Df&#x2212;Df) is not less than 5.00. A ratio Rcalculated by mathematical formula (2): R=(T*H)/His not less than 2.00. A ratio Rcalculated by mathematical formula (3): R=D/Tis less than 50. In mathematical formulas (1) to (3), Dfrepresents an amount of compressive deformation of the core, Dfrepresents an amount of compressive deformation of a sphere including the core and the mid layer, Dfrepresents an amount of compressive deformation of the golf ball, Trepresents a thickness of the mid layer, Hrepresents a hardness of the mid layer, Hrepresents a hardness of the cover, Drepresents a diameter of the core, and Trepresents a thickness of the cover.

A golf ball includes a core, a mid layer, and a cover. A ratio R1 calculated by mathematical formula (1): R1=(Df1&#x2212;Df2)/(Df2&#x2212;Df3) is not less than 5.00. A ratio R2 calculated by mathematical formula (2): R2=(T2*H2)/H3 is not less than 2.00. A ratio R3 calculated by mathematical formula (3): R3=D1/T3 is not less than 50. In mathematical formulas (1) to (3), Df1 represents an amount of compressive deformation of the core, Df2 represents an amount of compressive deformation of a sphere including the core and the mid layer, Df3 represents an amount of compressive deformation of the golf ball, T2 represents a thickness of the mid layer, H2 represents a hardness of the mid layer, H3 represents a hardness of the cover, D1 represents a diameter of the core, and T3 represents a thickness of the cover.

An object of the present invention is to provide a golf ball having improved spin performance on wedge shots under a wet condition such as rain by controlling the formulation of the paint film. The present invention provides a golf ball comprising a golf ball body and a paint film covering the golf ball body, wherein the paint film contains a base resin and a porous filler, and the porous filler contains SiOas a constituent in an amount of 50 mass % or more.

An object of the present invention is to provide a golf ball having excellent spin performance on approach shots under a wet condition and excellent spin performance on approach shots under a condition that there is grass between the golf ball and the club face. The present invention provides a golf ball comprising a golf ball body and a paint film composed of at least one layer and formed on a surface of the golf ball body, wherein an outermost layer of the paint film located at the outermost layer of the golf ball contains a base resin and a porous filer, the base resin contains a polyurethane obtained by a reaction between (A) a polyisocyanate composition and (B) a polyol composition containing a urethane polyol as a polyol component, the porous filler contains SiOin an amount of 50 mass % or more as a constituent component, and a loss tangent (tan &#x3b4;) of the outermost layer of the paint film measured with a dynamic viscoelasticity measuring apparatus under following conditions has a peak temperature in a range of from &#x2212;40&#xb0; C. to 40&#xb0; C.

An object of the present invention is to provide a golf ball having enhanced controllability on approach shots from the rough and excellent stain resistance and shot feeling. The present invention provides a golf ball comprising a golf ball body having a cover, and a paint film covering the golf ball body, wherein a 10% elastic modulus of the paint film is 75 kgf/cmor less, a storage modulus (E') at 150&#xb0; C. of the paint film obtained by measuring dynamic viscoelasticity of the paint film is 1.0&#xd7;10Pa or more, an indentation depth of the paint film measured under a specific measuring condition in a state that the paint film is formed on the surface of the golf ball body is 1250 nm or more, and a material hardness of the cover is less than 50 in Shore D hardness.

An object of the present invention is to provide a golf ball travelling a great flight distance on driver shots, having enhanced controllability on approach shots under a wet condition, and being excellent in stain resistance and shot feeling. The present invention provides a golf ball comprising a golf ball body having a cover, and a paint film covering the golf ball body, wherein a 10% elastic modulus of the paint film is 75 kgf/cmor less, a storage modulus (E') at 150&#xb0; C. of the paint film obtained by measuring dynamic viscoelasticity of the paint film is 1.0&#xd7;10Pa or more, an indentation depth of the paint film measured with a nanoindenter in a state that the paint film is formed on the surface of the golf ball body is 1250 nm or more, and a material hardness of the cover is 50 or more in Shore D hardness.

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Kobe, Japan

Hidetaka Inoue