Abstract: A golf ball having a cover with a plurality of dimples on the surface thereof is provided with a coat of mutually differing properties on dimple areas of the surface and on land areas between the dimples. The dimple areas are formed with a coat having a low coefficient of friction, do not affect the spin performance when the ball is struck and are not prone to staining. The land areas are formed with a coat having a high coefficient of friction, enabling a lower spin rate to be achieved and thus increasing the distance traveled by the ball, particularly when struck with a middle iron, and also help impart a high spin rate and a good controllability on approach shots.

Abstract: A matte colored golf ball which is free of luster and gloss has a good appearance in which injection marks that form during injection molding of a cover layer—be it an intermediate layer or an outermost layer—are difficult to see and scuffing on the cover surface is inconspicuous. The golf ball includes a core, an outermost layer, an intermediate layer therebetween, and a coat formed on the surface of the outermost layer. The intermediate layer is formed of a resin composition containing a thermoplastic resin and a colorant consisting of a fluorescent dye or a fluorescent pigment and has a specific visible light transmittance, the outermost layer is molded of a transparent or translucent resin composition that is free of fluorescent dye, and the coat is formed of a urethane-based coating composition containing delustering particles.

Abstract: To provide a golf ball that can prevent a decrease in carry distance of a driver shot when it rains and also, can exert excellent spinning performance upon an approach shot. The golf ball of the present invention includes a core, a cover that is provided on an outer side of the core and is provided with dimples, and an outermost layer that is formed on an outer side of the cover and made of a material having a contact angle of 90° or more. The golf ball has a dynamic friction coefficient of 0.52 or more. The material constituting the outermost layer comprises a urethane coating that contains a water repellent additive, and the water repellent additive includes a fluorinated surfactant, silicone-modified acrylate or hydrophobic silica.

Abstract: A matte golf ball which is free of luster and gloss has such a good ball appearance that the injection marks which form during injection molding of the cover are not visible. The golf ball includes a core of at least one layer, a cover of at least one layer, and a paint film. The outermost layer of the cover is formed of a resin composition which includes a thermoplastic resin and a colorant comprising a fluorescent dye or a fluorescent pigment, and has a visible light transmittance with an average value at wavelengths in the 380 to 780 nm spectrum of from 2.0 to 50.0%. The paint film is formed of a urethane-based paint composition containing delustering particles.

Abstract: To provide a golf ball that can prevent considerable decrease in carry distance of a driver shot when it rains and also can more reliably prevent adhesion of dirt, etc. to the surface of the golf ball. The golf ball of the present invention includes a core, a cover that is provided on an outer side of the core and is provided with dimples, and an outermost layer that is formed on an outer side of the cover and made of a material having a contact angle of 90° or more, a dynamic contact angle of 85° or less and an adhesive force of 130 ?N or less. The material for forming the outermost layer includes a urethane coating material with a water repellent additive.

Abstract: A golf ball paint composition includes primarily a urethane paint containing polyol as a base resin and polyisocyanate as a curing agent. The polyisocyanate includes two types of isocyanurate and adduct of hexamethylene diisocyanate and the golf ball paint composition has an elastic work recovery of at least 70%. The paint composition has a high self-repairing ability and is of high quality as a golf ball paint. Golf balls coated with this composition are able to maintain a good durability, in addition to which they have an excellent abrasion resistance and an excellent ball appearance.

Abstract: An evaluation method includes determining, by a computer processor, the times of occurrence of states of a golf ball during its contact with a collision surface, from the behavior of the golf ball based on its collision with the collision surface. A slide time or slide amount is calculated by the computer processor, based on the times of occurrence of the states. The slide time is a period from the start to the stop of a slide of the golf ball on the collision surface. The slide amount is the amount of the slide during the period. Information on the slide time or slide amount is output by the computer processor.

Abstract: To provide a golf ball that can prevent a decrease in carry distance of a driver shot when it rains and also, can exert excellent spinning performance upon an approach shot. The golf ball of the present invention includes a core, a cover that is provided on an outer side of the core and is provided with dimples, and an outermost layer that is formed on an outer side of the cover and made of a material having a contact angle of 90° or more. The golf ball has a dynamic friction coefficient of 0.52 or more. The material constituting the outermost layer comprises a urethane coating that contains a water repellent additive, and the water repellent additive includes a fluorinated surfactant, silicone-modified acrylate or hydrophobic silica.

Abstract: In a golf ball having a core, a cover of at least one layer and a paint film layer formed on a surface of the cover, the paint film layer has an elastic work recovery of at least 60%, the cover layer in contact with the paint film layer has a material hardness on the Shore D scale of at least 55 and, letting M be the elastic work recovery (%) of the paint film layer and N be the material hardness (Shore D hardness) of the cover layer, M?N>0. The ball surface is scratch-resistant and has an excellent durability, and the ball has a reduced spin rate on shots with a driver or a long iron, resulting in an increased carry.

Abstract: A golf ball paint composition includes primarily a urethane paint containing polyol as a base resin and polyisocyanate as a curing agent. Two types of polyester polyol are used as the polyol, and the composition has an elastic work recovery of at least 70%. The paint composition has a high self-repairing ability and is of high quality as a golf ball paint. Golf balls coated with this composition are able to maintain a good durability, in addition to which they have an excellent abrasion resistance and an excellent ball appearance.

Abstract: A golf ball having a core of at least one layer is provided on the ball surface with a delustering particle-containing coating layer having an average surface roughness Ra of between 0.5 and 1.0. The golf ball is a matte ball that is free of luster and gloss and moreover can prevent a reduction in the ball spin rate on approach shots.

Abstract: In a golf ball having a core of at least one layer and a paint film of at least one layer, at least one layer of the paint film includes delustering particles and the same or a differing layer of the paint film includes an effect pigment. The ball is a matte golf ball that is free of luster and gloss and moreover has a quality look.

Abstract: To provide a golf ball that can prevent considerable decrease in carry distance of a driver shot when it rains and also can more reliably prevent adhesion of dirt, etc. to the surface of the golf ball. The golf ball of the present invention includes a core, a cover that is provided on an outer side of the core and has dimples, and an outermost layer that is formed on an outer side of the cover and made of a material having a contact angle of 90° or more and a dynamic contact angle of 85° or less. The golf ball may have a dynamic friction coefficient of 0.48 or less. The cover may be formed of a material having hardness of 48 or more in terms of Shore D Hardness. The outermost layer may be formed of a urethane coating containing a water repellent additive, as a main component.

Abstract: An evaluation method includes determining, by a computer processor, the times of occurrence of states of a golf ball during its contact with a collision surface, from the behavior of the golf ball based on its collision with the collision surface. A slide time or slide amount is calculated by the computer processor, based on the times of occurrence of the states. The slide time is a period from the start to the stop of a slide of the golf ball on the collision surface. The slide amount is the amount of the slide during the period. Information on the slide time or slide amount is output by the computer processor.

Abstract: A matte golf ball which is free of luster and gloss has such a good ball appearance that the injection marks which form during injection molding of the cover are not visible. The golf ball includes a core of at least one layer, a cover of at least one layer, and a paint film. The outermost layer of the cover is formed of a resin composition which includes a thermoplastic resin and a colorant comprising a fluorescent dye or a fluorescent pigment, and has a visible light transmittance with an average value at wavelengths in the 380 to 780 nm spectrum of from 2.0 to 50.0%. The paint film is formed of a urethane-based paint composition containing delustering particles.

Abstract: To provide a golf ball that can prevent a decrease in carry distance of a driver shot when it rains and also, can exert excellent spinning performance upon an approach shot. The golf ball of the present invention includes a core, a cover that is provided on an outer side of the core and has dimples, and an outermost layer that is formed on an outer side of the cover and made of a material having a contact angle of 90° or more, the golf ball having a dynamic friction coefficient of 0.52 or more. The cover may be formed of thermoplastic polyurethane having hardness of 55 or more in terms of Shore D Hardness. The outermost layer may be formed of a urethane coating containing a water repellent additive, as a main component.

Abstract: The present invention provides a golf ball capable of exhibiting an excellent spin performance in approach shot while the effect on the spin performance in driver shot is being suppressed to be low. The golf ball of the present invention includes a core, a cover located outside the core and having dimples formed thereon, and a coating layer located outside the cover and formed with a material having a surface force of ?130 ?N or less.

Abstract: A colored golf ball has improved luxurious appearance without impairing its visibility. The colored golf ball of the present invention includes a core; a cover placed around the core having dimples formed on its surface; and a coating layer placed on top of the cover, in which the coating layer includes a polymer matrix having a bright material dispersed therein, and an L0 value, which represents an L value in the Lab color system of the colored golf ball before being covered with the coating layer, is 55 or less, and the difference ?L between the L0 value and an L1 value, which represents an L value in the Lab color system of the colored golf ball after being covered with the coating layer, is 5 or more.

Abstract: To provide a golf ball that can prevent considerable decrease in carry distance of a driver shot when it rains and also can more reliably prevent adhesion of dirt, etc. to the surface of the golf ball. The golf ball of the present invention includes a core, a cover that is provided on an outer side of the core and has dimples, and an outermost layer that is formed on an outer side of the cover and made of a material having a contact angle of 90° or more and a dynamic contact angle of 85° or less. The golf ball may have a dynamic friction coefficient of 0.48 or less. The cover may be formed of a material having hardness of 48 or more in terms of Shore D Hardness. The outermost layer may be formed of a urethane coating containing a water repellent additive, as a main component.

Abstract: To provide a golf ball that can prevent a decrease in carry distance of a driver shot when it rains and also, can exert excellent spinning performance upon an approach shot. The golf ball of the present invention includes a core, a cover that is provided on an outer side of the core and has dimples, and an outermost layer that is formed on an outer side of the cover and made of a material having a contact angle of 90° or more, the golf ball having a dynamic friction coefficient of 0.52 or more. The cover may be formed of thermoplastic polyurethane having hardness of 55 or more in terms of Shore D Hardness. The outermost layer may be formed of a urethane coating containing a water repellent additive, as a main component.