Abstract: 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.

Abstract: 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.

Abstract: Golf ball 2 of the present invention has core 4, cover 10 situated on the external side of the core 4, and paint layer 16 provided to cover this cover 10. The base polymer of the cover 10 is a urethane resin. The base polymer of the paint layer 16 is a urethane resin. The cover 10 has a thickness Tc of 0.1 mm or greater and 0.7 mm or less. The paint layer 16 has 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 layer 16 is formed with two or more layers 18 and 20. Preferably, the base polymer of the paint layer 16 is a two-pack type urethane resin or a two-pack type epoxy resin.

Abstract: 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.

Abstract: 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.

Abstract: A golf ball 2 includes a core 4, an envelope layer 6 positioned outside the core 4, a mid layer 8 positioned outside the envelope layer 6, and a cover 10 positioned outside the mid layer 8. The core 4 includes a spherical center 12 and a core outer layer 14 positioned outside the center 12. The center 12 has a diameter of 1 mm or greater and 15 mm or less. The difference (H4?H3) between the JIS-C hardness H4 of the core 4 at its surface and the JIS-C hardness H3 of the core outer layer 14 at its innermost portion is equal to or greater than 10. The cover 10 has a Shore D hardness H7 less than 40. The Shore D hardnesses H5, H6 and H7 of the envelope layer 6, the mid layer 8, and the cover 10 satisfy that H5>H6?H7.

Abstract: A golf ball 2 has a spherical core 4 and a cover 6 positioned outside this core 4. The core 4 has a spherical center 8 and a mid layer 10 positioned outside this center 8. The center 8 is 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 center 8 has a diameter of 1 mm or greater and 15 mm or less. The center 8 has a central hardness H1 of 20 or greater and 50 or less. A difference (H4?H3) between a hardness H4 of a surface of the mid layer 10 and a hardness of an innermost part thereof is equal to or greater than 10.

Abstract: 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.

Abstract: Golf ball 2 has spherical core 4, cover 6 situated on the external side of the core 4, and paint layer 8 situated on the external side of the cover 6. The cover 6 has a Shore D hardness of no greater than 61. The paint layer 8 has a Martens hardness of no greater than 2.0 mgf/?m2. The base polymer of the paint layer 8 is a polyurethane obtained by a reaction of a polyol with a polyisocyanate. The polyisocyanate contains a buret-modified form of hexamethylene diisocyanate. The cover 6 has a thickness of 0.3 mm or greater and 1.0 mm or less. The paint layer 8 has a thickness of 5 ?m or greater and 40 ?m or less.

Abstract: A golf ball 2 has a core 4, an inner cover 6 positioned outside this core 4 and an outer cover 8 positioned outside the inner cover 6. The core 4 has a spherical center 10 and a mid layer 12 positioned outside this center 10. The center 10 is formed by crosslinking a rubber composition. The mid layer 12 is formed by crosslinking a rubber composition. The inner cover 6 is made of a thermoplastic resin composition. The outer cover 8 is made of a thermoplastic resin composition. The center 10 has a diameter of 1 mm or greater and 15 mm or less. The center 10 has a central point having JIS-C hardness H1 of 20 or greater and 50 or less. A difference (H4?H3) between a hardness H4 of a surface of the core and a hardness H3 of an innermost part of the mid layer is equal to or greater than 10. A hardness H5 of the inner cover is smaller than a hardness H6 of the outer cover.

Abstract: 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? of 2.11×107 Pa or less, and a ratio (E?/G?) of a tensile loss modulus E? to the shear loss modulus G? of 1.78 or more, when measuring the shear loss modulus G? in a shear mode and the tensile loss modulus E? in a tensile mode at conditions of a temperature of 0° C., oscillation frequency of 10 Hz using a dynamic viscoelasticity measuring apparatus.

Abstract: A golf ball 2 includes a core 4, a mid layer 6, and a cover 8. The core 4 includes a center 10 and an envelope layer 12. The ratio (Do/De) of an amount of compressive deformation Do of the center 10 to an amount of compressive deformation De of the core 4 is 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 center 10 to an amount of compressive deformation Dc of the golf ball 2 is equal to or greater than 1.8. The diameter of the center 10 is equal to or less than 20 mm. The difference (He?Ho) between a surface hardness He of the core 4 and a central hardness Ho of the center 10 is equal to or less than 40.

Abstract: 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? (Pa), G2? (Pa), and G3? (Pa) that satisfy following equations when measured using a dynamic viscoelasticity measuring apparatus at following conditions. log G1??7.09??(1) log G2??7.17??(2) log G3??7.14??(3) G1? measuring conditions: shear mode, oscillation frequency: 10 Hz, temperature: 0° C., strain: 0.05%; G2? measuring conditions: shear mode, oscillation frequency: 10 Hz, temperature: ?30° C., strain: 0.05%; and G3? measuring conditions: shear mode, oscillation frequency: 10 Hz, temperature: 0° C., strain: 5%.

Abstract: A golf ball 2 includes a spherical core 4, a mid layer 6 outside the core 4, and a cover 8 outside the mid layer 6. The core 4 includes a spherical center 10 and an envelope layer 12 outside the center 10. 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 4, the following mathematical formula is satisfied. ?5<H2?H1<5 In the mathematical formula, H1 indicates the JIS-C hardness at a point P1 located radially inward of each point P at a distance of 1 mm from the point P, and H2 indicates the JIS-C hardness at a point P2 located radially outward of each point P at a distance of 1 mm from the point P.

Abstract: 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.

Abstract: Golf ball 2 has spherical core 4, surrounding layer 6 situated on the external side of the core 4, mid layer 8 situated on the external side of the surrounding layer 6, cover 10 situated on the external side of the mid layer 8, and paint layer 12 situated on the external side of the cover 10. The mid layer 8 has a thickness Tm of 0.1 mm or greater and 1.2 mm or less. The ratio (Tc/Tm) of the thickness Tc of the cover 10 to the thickness Tm of the mid layer 8 is no greater than 0.50. The cover 10 has a Shore D hardness Hc of no greater than 35. The Shore D hardness Hm of the mid layer 8 is greater than the Shore D hardness Hc of the cover 10. The base material of the surrounding layer 6 is an ionomer resin. The base material of the mid layer 8 is a polyurethane. The base material of the cover 10 is a polyurethane.

Abstract: A golf ball 2 includes a spherical core 4, an envelope layer 6 positioned outside the core 4, a mid layer 8 positioned outside the envelope layer 6, a reinforcing layer 10 positioned outside the mid layer 8, and a cover 12 positioned outside the reinforcing layer 10. The mid layer 8 has a thickness Tm less than 1.0 mm. The envelope layer 6 has a Shore D hardness Hs of 60 or greater. The mid layer 8 has a Shore D hardness Hm of 50 or greater and 65 or less. The cover 12 has a Shore D hardness Hc less than 40. The golf ball 2 satisfies that Hs>Hm>Hc. The principal components of the base materials of the envelope layer 6, the mid layer 8 and the cover 12 are an ionomer resin, an ionomer resin and a thermoplastic polyurethane elastomer, respectively.

Abstract: A golf ball 2 has a core 4, an inner cover 6 positioned outside the core 4 and an outer cover 8 positioned outside the inner cover 6. The core 4 has a spherical center 10 and a mid layer 12 positioned outside the center 10. The center 10 has a diameter of 1 mm or greater and 15 mm or less. A difference (H4?H3) between a JIS-C hardness H4 of a surface of the core and a JIS-C hardness H3 of an innermost part of the mid layer is equal to or greater than 10. The hardness H4 is greater than a JIS-C hardness H2 of a surface of a spherical body including the core 4 and the inner cover 6. A Shore D hardness H7 of the outer cover 8 is less than 40.

Abstract: An object of the present invention is to provide a novel golf ball that controls the spin rate on the approach shots while suppressing the change in the spin rate on the driver shots and a method for producing the same. The present invention provides a golf ball having a cover containing a resin component and a filler, wherein the filler is oriented roughly parallel to a surface of the cover. The cover having anisotropy behaves like a hard material against the deformation in the compression direction on the driver shots and behaves like a soft material against the deformation in the shear direction on the approach shots. The present invention also provides a method for producing a golf ball, comprising compression molding a cover composition containing a resin component and a filler to mold a shell, and compression molding a core covered with a plurality of shells to mold a cover.

Abstract: An object of the present invention is to provide a golf ball material producing a high spin rate on approach shots and a low spin rate on driver shots and a golf ball using the same. The present invention provides a golf ball material having a ratio [Shore D/log(bending stiffness)] of Shore D hardness to a logarithm of bending stiffness (kgf/cm2) of 19.0 or more.