Abstract: 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 SiO2 as a constituent in an amount of 50 mass % or more.

Abstract: A golf ball 2 includes a core 4, an inner cover 6, a main cover 8, and an outer cover 10. S=Hs×Rc×0.05, M=Hm×Tm, I=Hi×Ti, O=Ho×To, and Q=(I+O)/2 that are calculated from a radius Rc of the core 4, a Shore C hardness Hs at a surface of the core 4, a thickness Tm of the main cover 8, a Shore C hardness Hm of the main cover 8, a thickness Ti of the inner cover 6, a Shore C hardness Hi of the inner cover 6, a thickness To of the outer cover 10 and a Shore C hardness Ho of the outer cover 10, satisfy 15?M?S?100, 0.25<Q/M?0.5, and 30<I?O.

Abstract: An object of the present invention is to provide a golf ball showing low spin rate on driver shots and high spin rate on approach shots. The present invention provides a multi-piece golf ball comprising a spherical center, at least two envelope layers covering the spherical center, and a cover covering the envelope layers, wherein the envelope layers comprise at least a first envelope layer covering the spherical center, and a second envelope layer covering the first envelope layer, a material hardness (H0) of the spherical center, a material hardness (H1) of the first envelope layer, and a material hardness (H2) of the second envelope layer satisfy an equation of H0>H1>H2, and the material hardness (H2) of the second envelope layer is lowest among the material hardness of the center constituent material and material hardness of envelope layer constituent materials.

Abstract: A golf ball 2 includes a main body 4 and a paint layer 6 positioned outside the main body 4. The paint layer 6 includes an inner layer 14 and an outer layer 16 positioned outside the inner layer 14. When an indentation depth (nm) is measured on a cross-section along a plane passing through a central point of the golf ball 2 when a force of 30 mgf is applied to the cross-section in a direction perpendicular to the cross-section, an indentation depth Di on a cross-section of the inner layer 14 is smaller than an indentation depth Do on a cross-section of the outer layer 16. A thickness To of the outer layer 16 is smaller than a thickness Ti of the inner layer 14.

Abstract: A golf ball 2 includes a main body 4 and a paint layer 6 positioned outside the main body 4. The main body 4 includes a spherical core 8, a mid layer 10 positioned outside the core 8, and a cover 12 positioned outside the mid layer 10. An indentation depth, measured when the paint layer 6 in a cross-section along a plane passing through a central point of the golf ball 2 is 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 layer 6 preferably has a thickness of not less than 5 ?m and not greater than 50 ?m.

Abstract: An object of the present invention is to provide a golf ball that can strike a good balance in approach performance under a rough condition and a wet condition while maintaining a flight distance on driver shots.

Abstract: An object of the present invention is to provide a golf ball having good spin performance on approach shots and good shot feeling as well as excellent stain resistance by precisely controlling physical properties of a paint film actually formed on a surface of a golf ball body. The present invention provides a golf ball comprising a golf ball body and a paint film formed on a surface of the golf ball body, wherein the paint film is such that a linear approximation curve obtained by a least square method has a slope in an absolute value ranging from 0.0001 to 0.0020 when a loss tangent tan ? thereof measured by a nanoindentation method is plotted as a vertical axis against a measuring frequency (Hz) as a horizontal axis, and that an elastic modulus thereof measured by a nanoindentation method ranges from 0.040 GPa to 0.600 GPa.

Abstract: An object of the present invention is to provide a golf ball showing a small ratio of a spin rate on driver shots to a spin rate on approach shots. The present invention provides a multi-piece golf ball comprising a spherical center, three or more envelope layers covering the spherical center, and a cover covering the envelope layers, wherein adjacent two envelope layers are formed so as to include a region composed of elements having a hitting deformation ratio of 30% or more, the hitting deformation ratio being obtained by analyzing a specified golf ball model by a finite element method; and the envelope layer which is radially outwardly positioned of the adjacent two envelope layers has a lowest hardness among all the envelope layers.

Abstract: An object of the present invention is to provide a golf ball showing improved controllability on approach shots for less than 40 yards, in particular, on approach shots around the green (about 10 yards to 20 yards) and improved controllability on approach shots from the rough, and showing excellent shot feeling. The present invention provides a golf ball comprising a golf ball body and a paint film covering the golf ball body, wherein a loss tangent tans has a peak temperature of 50° C. or less and a peak height of less than 0.8, obtained by measuring dynamic viscoelasticity of the paint film under the following conditions: <Measuring Conditions> Measuring mode: tensile mode Measuring temperature range: from ?100° C. to 150° C. Temperature rising rate: 4° C./min Oscillation frequency: 10 Hz Measuring strain: 0.1.

Abstract: A golf ball includes a spherical core and a cover positioned outside the core. The core has an inner layer and an outer layer positioned outside the inner layer. The inner layer is obtained by crosslinking a rubber composition. The rubber composition of the inner layer includes a butyl-based rubber as a base rubber. The inner layer has a diameter Di of not less than 10 mm and not greater than 34 mm. A difference (H2?H0) between a Shore C hardness H2 at a surface of the outer layer and a Shore C hardness H0 at a central point of the inner layer is less than 35. Preferably, the butyl-based rubber is a polymer including an isobutylene unit and an isoprene unit, and a derivative thereof.

Abstract: An object of the present invention is to provide a golf ball showing improved controllability on approach shots for less than 40 yards, in particular, on approach shots around the green (about 10 yards to 20 yards) and improved controllability on approach shots from the rough, and showing excellent shot feeling. The present invention provides a golf ball comprising a golf ball body and a paint film covering the golf ball body, wherein a loss tangent tan ? has a peak temperature of 50° C. or less and a peak height of less than 0.8, obtained by measuring dynamic viscoelasticity of the paint film under the following conditions: <Measuring conditions> Measuring mode: tensile mode Measuring temperature range: from ?100° C. to 150° C. Temperature rising rate: 4° C./min Oscillation frequency: 10 Hz Measuring strain: 0.1%.

Abstract: An object of the present invention is to provide a golf ball showing a low spin rate on driver shots and a high spin rate on approach shots. The present invention provides a golf ball having a low hardness part having a hardness in a range from 5 to 40 in Shore D hardness or a lowest hardness point in a core hardness distribution in a region located at a distance from 36.0% to 65.0% of a radius of the golf ball from a center point of the golf ball.

Abstract: An object of the present invention is to provide a golf ball that can strike a good balance in approach performance under a rough condition and a wet condition while maintaining a flight distance on driver shots.

Abstract: 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/cm2 or less, a storage modulus (E?150) at 150° C. of the paint film obtained by measuring dynamic viscoelasticity of the paint film is 1.0×107 Pa 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.

Abstract: 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/cm2 or less, a storage modulus (E?150) at 150° C. of the paint film obtained by measuring dynamic viscoelasticity of the paint film is 1.0×107 Pa 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.

Abstract: An object of the present invention is to provide a grip for sporting goods containing an acrylonitrile-butadiene based rubber as a base rubber and having an excellent grip performance and sustainability of grip performance under a wet condition. The present invention provides a grip for sporting goods comprising an outermost surface layer formed from a surface layer rubber composition, wherein the surface layer rubber composition contains (A) a base rubber and (B) a resin having a softening point in a range from 5° C. to 120° C., (A) the base rubber contains an acrylonitrile-butadiene based rubber, and (B) the resin is at least one type selected from the group consisting of a hydrogenated rosin ester, a disproportionated rosin ester, an ethylene-vinyl acetate copolymer, a coumarone resin, a phenol resin, a xylene resin and a styrene resin.

Abstract: A golf ball 2 includes a main body 4 and a paint layer 6 positioned outside the main body 4. The paint layer 6 includes an inner layer 14 and an outer layer 16 positioned outside the inner layer 14. When an indentation depth (nm) is measured on a cross-section along a plane passing through a central point of the golf ball 2 when a force of 30 mgf is applied to the cross-section in a direction perpendicular to the cross-section, an indentation depth Di on a cross-section of the inner layer 14 is smaller than an indentation depth Do on a cross-section of the outer layer 16. A thickness To of the outer layer 16 is smaller than a thickness Ti of the inner layer 14.

Abstract: A golf ball 2 includes a main body 4 and a paint layer 6 positioned outside the main body 4. The main body 4 includes a spherical core 8, a mid layer 10 positioned outside the core 8, and a cover 12 positioned outside the mid layer 10. An outer surface of the paint layer 6 forms a surface of the golf ball 2. A contact angle CAw with respect to water measured on the surface of the golf ball 2 is not less than 70 degrees. The paint layer 6 is preferably formed from a resin composition. A preferable resin composition includes a polyurethane as a base resin and includes a silicone compound and/or a fluorine compound. Another preferable resin composition includes a silicone compound and/or a fluorine compound as a base resin and includes no polyurethane.

Abstract: An object of the present invention is to provide a golf ball showing increased controllability on approach shots for less than 40 yards and showing excellent shot feeling. In the inventive golf ball, the paint film is formed from a curing type paint composition including: a base material containing a polyrotaxane, and a curing agent containing a polyisocyanate, and wherein the polyrotaxane has a cyclodextrin, a linear molecule included in a cyclic structure of the cyclodextrin in a manner of piercing through the cyclic structure of the cyclodextrin, and a blocking group located at both ends of the linear molecule to prevent disassociation of the cyclodextrin, and at least a part of hydroxyl groups of the cyclodextrin is modified with a caprolactone chain via —O—C3H6—O— group.

Abstract: An object of the present invention is to provide a golf ball showing increased controllability on approach shots for less than 40 yards and showing excellent shot feeling. In the inventive golf ball, the paint film is formed from a curing type paint composition including: a base material containing a polyrotaxane, and a curing agent containing a polyisocyanate, and wherein the polyrotaxane has a cyclodextrin, a linear molecule included in a cyclic structure of the cyclodextrin in a manner of piercing through the cyclic structure of the cyclodextrin, and a blocking group located at both ends of the linear molecule to prevent disassociation of the cyclodextrin, and at least a part of hydroxyl groups of the cyclodextrin is modified with a caprolactone chain via —O—C3H6—O— group.