Abstract: A golf ball achieving both excellent hit feeling and good restitution performance by using a rubber composition having moderate hardness and sufficient restitution performance is provided. The golf ball includes a rubber composition obtained by blending 10 to 50 parts by mass of a co-crosslinking agent and 0.1 to 6 parts by mass of a crosslinking initiator with 100 parts by mass of a rubber component. The rubber component contains at least 80 mass percent of hydrogenated polybutadiene having a double bond residual rate of 80 to 99% or preferably 85 to 99%, and cis-1,4-structure content rate of not smaller than 90% or preferably not smaller than 95%. Polybutadiene is obtained by hydrogenating a part of its double bonds.

Abstract: The present invention provides a rubber composition for obtaining golf ball having good processability, excellent rebound characteristics and excellent durability. The present invention relates to a rubber composition for golf ball comprising a base rubber, a co-crosslinking agent, an organic peroxide, a filler and a processing aid, wherein the base rubber comprises a polybutadiene (a) containing a cis-1,4 bond of not less than 80% and synthesized using lanthanide-containing catalyst, the organic peroxide comprises an organic peroxide having 10 hours half-life period temperature of 80 to 100° C., and the processing aid is fatty acid ester, fatty acid salt or the mixture thereof.

Abstract: A packaging box, for a golf ball, is formed by folding a packaging sheet comprising a decomposable laminate material consisting of a polylactic acid-containing polymer film and a sheet of paper laminated with the polylactic acid-containing polymer film. A portion corresponding to a window is cut out from the paper, and the window is covered with the polylactic acid-containing polymer film laminated on the paper. The window is formed straddlingly on two or three planes such that the polylactic acid-containing polymer film covering the window is bent perpendicularly at a boundary between the planes adjacent to each other. A raised portion is formed on the packaging sheet.

Abstract: The present invention provides a solid golf ball having excellent rebound characteristics and excellent durability, and showing good workability when producing. The present invention relates to a solid golf ball composed of at least one layer of a rubber material as a component, wherein the rubber material is formed from the rubber composition comprising a base rubber, a co-crosslinking agent, an organic peroxide and an inorganic filler, and the rubber composition comprises 10 to 100 parts by weight of a polybutadiene containing a cis-1,4 bond of not less than 80%, having a Mooney viscosity of not less than 50 to less than 65 ML1+4 (100° C.), a ratio (Mw/Mn) of weight average molecular weight (Mw) to number average molecular weight (Mn) of 2.5 to 3.5 and Mw of 50×104 to 70×104, synthesized using lanthanide-containing catalyst, based on 100 parts by weight of the base rubber.

Abstract: The present invention provides a golf ball having enhanced durability of the clear coating film and the mark. The golf ball of the invention comprises: a ball body having an ionomer resin cover; an epoxy coating film formed on the ball body, a polyurethane clear coating film formed on the epoxy coating film, wherein the epoxy coating film is made by curing an epoxy resin with a polyamide curing agent; and the polyurethane clear coating film is made by curing a polyol with an isocyanate curing agent, wherein the polyol is a mixture of a polyester polyol and a polyether polyol.

Abstract: The present invention provides a solid golf ball having excellent rebound characteristics and excellent durability, and showing good workability when producing. The present invention relates to a solid golf ball composed of at least one layer of a rubber material as a component, wherein the rubber material is formed from the rubber composition comprising a base rubber, a co-crosslinking agent, an organic peroxide and an inorganic filler, and the rubber composition comprises 10 to 100 parts by weight of a polybutadiene containing a cis-1,4 bond of not less than 80%, having a Mooney viscosity of not less than 50 to less than 65 ML1+4 (100° C.), a ratio (Mw/Mn) of weight average molecular weight (Mw) to number average molecular weight (Mn) of 2.5 to 3.5 and Mw of 50×104 to 70×104, synthesized using lanthanide-containing catalyst, based on 100 parts by weight of the base rubber.

Abstract: A golf ball excellent in durability and feel is formed of a polymer compound containing a ternary composite formed of a rubber component, a polyolefin component and a nylon component. In particular, it is a golf ball formed of a core and a cover arranged to cover the core, the core being formed using a polymer compound containing a ternary composite formed of a rubber component, a polyolefin component and a nylon component, the polymer compound being formed of rubber, thermoplastic resin, thermoplastic elastomer, ionomer or a mixture thereof.

Abstract: The present invention provides a golf ball having enhanced durability of the clear coating film and the mark. The golf ball of the invention comprises: a ball body having an ionomer resin cover; an epoxy coating film formed on the ball body, a polyurethane clear coating film formed on the epoxy coating film, wherein the epoxy coating film is made by curing an epoxy resin with a polyamide curing agent; and the polyurethane clear coating film is made by curing a polyol with an isocyanate curing agent, wherein the polyol is a mixture of a polyester polyol and a polyether polyol.

Abstract: The present invention provides a golf ball which is excellent in durability such a degree to be used in the golf practice shooting range. The golf ball includes a core, a cover covering the core, and a mark printed on a surface of the cover, wherein: the cover is formed from a mixture of an ionomer and an epoxy group-containing polymer; and the mark is printed with an ink containing a pigment, an isocyanate compound, and a base resin which is curable with the isocyanate compound.

Abstract: A multi-layer solid golf ball has small impact force and good shot feel at the time of hitting, and excellent rebound characteristics when hitting at low head speed because the rebound characteristics do not depend on the head speed at the time of hitting. The multi-layer solid golf ball core is composed of an inner layer core, intermediate layer core formed on the inner layer core and an outer layer core formed on the intermediate layer core, and one or more layers of cover on the outer layer core, wherein the inner layer core has a deformation amount (X) 3.0 to 4.5 mm, a two-layer core composed of the inner layer core and the intermediate layer core has a deformation amount (Y) 3.5 to 6.0 mm, a three-layer core composed of the two-layer core with the outer layer core has a deformation amount (Z) 3.0 to 5.0 mm.

Abstract: The present invention provides a golf ball having excellent flyer resistance at a shot on the rough, and having high rebound characteristics and excellent flight performance. The present invention relates to a golf ball comprising a core having a single-layered structure or a multi-layered structure and a cover covering the core, wherein the cover has a complex elastic modulus at −10° C. of 20 to 150 MPa and loss tangent (tan &dgr;) at −10° C. of not less than 0.05, as determined from temperature-dependent curves of the complex elastic modulus and tan &dgr; obtained by dynamic viscoelastic measurement at a frequency of 10 Hz, a dynamic strain of 5% and a heating rate of 4° C./min.

Abstract: A core is enveloped by a cover with trans 1,4-polyisoprene as the main component, including a super accelerator formed of dithiocarbamate and/or xanthate, and vulcanized at a temperature lower than the melting point of trans 1,4-polyisoprene to provide a golf ball having high impact resilience and spinning performance. Also, a core is enveloped by an inner layer cover having trans 1,4-polyisoprene as the main component, including a super accelerator formed of dithiocarbamate and/or xanthate, and the inner layer cover is surrounded by an outer layer cover with trans 1,4-polyisoprene as the main component, including a super accelerator of an amount larger than that in the inner layer cover to provide a golf ball having high impact resilience and spinning performance, and whose cover material is sufficiently anchored.

Abstract: A golf ball 1 has a core 2, a cover 3, a mark layer 4, and a finishing coat layer 5. An ink used for the mark layer 4 includes an isocyanate curing agent that contains a diisocyanate trimer, a base material, and a colorant. Preferred curing agent contains an isophorone diisocyanate trimer. The ink includes a diisocyanate curing agent at equal to or greater than 1% by weight and equal to or less than 20% by weight, calculated on the basis of the solid content. The base material includes a polymer having a hydroxyl group as a principal component. The “NCO/OH” value, which is a ratio of isocyanate groups of the isocyanate curing agent and hydroxyl groups of the base material, is equal to or greater than 0.5 and equal to or less than 2.0. The mark layer 4 may be printed on a base coat layer, alternatively, may be printed on a crosslinked rubber. This ink has excellent adhesiveness to a base.

Abstract: The present invention provides a coated one-piece golf ball having excellent adhesion of a paint layer to a golf ball body and good appearance.

Abstract: The present invention provides a yellow-colored golf ball which can be manufactured without polluting the production line with a yellow pigment, exhibits a glossy appearance, and has superior visibility in a cloudy weather, even in a rainy weather where the golf balls become less visible. The golf ball of the invention consists of a golf ball body containing a yellow pigment and a clear paint film which is coating the surface of the golf ball body, and has the color tone which satisfies the following relation ship: L≧85.0 and 75≦b<90 specified by Lab color specification.

Abstract: The present invention provides a one-piece solid golf ball having excellent rebound characteristics and good shot feel, while maintaining excellent processability and durability. The present invention relates to a one-piece solid golf ball formed from a rubber composition comprising a mixture consisting of polybutadiene (a) synthesized using nickel-containing catalyst and polybutadiene (b) synthesized using cobalt-containing catalyst and hydroquinone or derivatives thereof as a vulcanization stabilizer, wherein a Mooney viscosity and a weight ratio of the polybutadienes (a) and (b), an amount of the vulcanization stabilizer, a center hardness (the minimum hardness in the golf ball) and surface hardness of the golf ball, and a difference between the maximum hardness and minimum hardness in the golf ball are adjusted to a specified range.

Abstract: The present invention provides a light weight golf ball having excellent flight performance and good shot feel. The present invention relates to a light weight golf ball comprising a core and a cover covering the core, wherein the cover has a flexural modulus (F) of 200 to 600 MPa, the golf ball has a specific gravity of not less than 0.50 and less than 1.00, and a deformation amount (D) of 3.1 to 5.0 mm when applying from an initial load of 98 N to a final load of 1275 N, and a ratio (F/D) of the flexural modulus of the cover (F) to the deformation amount of the golf ball (D) is within the range of more than 50 and not more than 125.

Abstract: The present invention provides a floatable golf ball for a driving range having excellent durability and good shot feel.

Abstract: The present invention provides a golf ball having excellent flyer resistance at a shot on the rough, and having high rebound characteristics and excellent flight performance. The present invention relates to a golf ball comprising a core having a single-layered structure or a multi-layered structure and a cover covering the core, wherein the cover has a complex elastic modulus at −10° C. of 20 to 150 MPa and loss tangent (tan &dgr;) at −10° C. of not less than 0.05, as determined from temperature-dependent curves of the complex elastic modulus and tan &dgr; obtained by dynamic viscoelastic measurement at a frequency of 10 Hz, a dynamic strain of 5% and a heating rate of 4° C./min.

Abstract: A packaging box, for a golf ball, is formed by folding a packaging sheet comprising a decomposable laminate material consisting of a polylactic acid-containing polymer film and a sheet of paper laminated with the polylactic acid-containing polymer film. A portion corresponding to a window is cut out from the paper, and the window is covered with the polylactic acid-containing polymer film laminated on the paper. The window is formed straddlingly on two or three planes such that the polylactic acid-containing polymer film covering the window is bent perpendicularly at a boundary between the planes adjacent to each other. A raised portion is formed on the packaging sheet.