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 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 multi-layer structure golf ball having a thread rubber layer, which has good shot feel and controllability as well as satisfactory flight performance and cut resistance. The golf ball includes a thread wound core and a cover covering the thread wound core, wherein the cover is formed from a heated mixture of: (A) an ionomer resin, (B) a thermoplastic elastomer having a carboxyl group or a thermoplastic elastomer having a terminal OH group, and (C) a block copolymer having a styrene-butadiene-styrene structure in which the polybutadiene block contains epoxy groups, or a block copolymer having styrene-isoprene-styrene structure in which the polyisoprene block contains epoxy groups, the cover have a flexural modulus of from 50 to 300 MPa and a Shore D-scale hardness of from 40 to 60.

Abstract: A solid golf ball having good shot feel and durability as well as satisfactory flight performance and cut resistances which comprises a solid core and a cover covering the core, wherein the cover is formed from a heated mixture of: (A) an ionomer resin, (B) a thermoplastic elastomer having a carboxyl group or a thermoplastic elastomer having a terminal OH group, and (C) a block copolymer having a styrene-butadiene-styrene structure in which the polybutadiene block contains epoxy groups, or a block copolymer having styrene-isoprene-styrene structure in which the polyisoprene block contains epoxy groups, wherein the cover has a flexural modulus of from 50 to 300 MPa and a Shore D-scale hardness of from 40 to 60.

Abstract: A solid golf ball having good shot feel and durability as well as satisfactory flight performance and cut resistance. Which comprises a solid core and a cover covering the core, wherein the cover is formed from a heated mixture of: (A) an ionomer resin, (B) a thermoplastic elastomer having a carboxyl group or a thermoplastic elastomer having a terminal OH group, and (C) a block copolymer having a styrene-butadiene-styrene structure in which the polybutadiene block contains epoxy groups, or a block copolymer having styrene-isoprene-styrene structure in which the polyisoprene block contains epoxy groups, wherein the cover has a flexural modulus of from 50 to 300 MPa and a Shore D-scale hardness of from 40 to 60.

Abstract: The present invention provides a multi-layer structure golf ball having a thread rubber layer, which has good shot feel and controllability as well as satisfactory flight performance and cut resistance. The golf ball includes a thread wound core and a cover covering the thread wound core, wherein the cover is formed from a heated mixture of: (A) an ionomer resin, (B) a thermoplastic elastomer having a carboxyl group or a thermoplastic elastomer having a terminal OH group, and (C) a block copolymer having a styrene-butadiene-styrene structure in which the polybutadiene block contains epoxy groups, or a block copolymer having styrene-isoprene-styrene structure in which the polyisoprene block contains epoxy groups, the cover has a flexural modulus of from 50 to 300 MPa and a Shore D-scale hardness of from 40 to 60.

Abstract: The present invention provides a golf ball exhibiting excellent shot feel, long flight distance and easy applicability of spin when hit by short irons. The golf ball comprises a thread wound core and a cover covering the thread wound core, the thread wound core comprising a solid center and a thread rubber layer formed by winding thread rubber around the solid center, wherein the solid center has a diameter of 30 to 38 mm, a surface hardness, determined by JIS-C hardness meter, of 40 to 90 and a hardness difference between the center point and the surface, determined by JIS-C hardness meter, of within 5, the solid center also has a deformation amount of 0.5 to 2.

Abstract: The present invention provides a golf ball having good shot feel, good controllability, high rebound characteristics and good flight performance. The golf ball of the present invention is composed of a core and a cover covering the core, wherein the cover contains an ionomer, prepared by neutralizing a terpolymer of ethylene, acrylic or methacrylic acid and an acrylic ester with magnesium ion, in an amount of 5 to 100% by weight based on the total resin amount of the cover.

Abstract: Disclosed is a golf ball having excellent shot feel, control properties as well as satisfactory flight performance and cut resistance. The golf ball of the present invention has a core and a cover for covering the core, wherein the cover has a stiffness modulus of 100 to 250 MPa, and is prepared from a resin composition comprising, as a base resin, a mixture of the following resin (A) and resin (B) in a weight ratio of 60:40 to 90:10:resin (A): an ionomer resin (i) obtained by neutralizing with metal ion at least a part of carboxyl groups in a copolymer of ethylene and an .alpha., .beta.-unsaturated carboxylic acid, or a mixture of the ionomer resin (i) and an ionomer resin (ii) obtained by neutralizing with metal ion at least a part of carboxyl groups in a terpolymer of ethylene, an .alpha., .beta.-unsaturated carboxylic acid and an .alpha., .beta.

Abstract: A golf ball having a dimpled surface is coated with a paint layer having a constant film thickness even at the edges of the dimples wherein the paint layer comprises a polyurethane and/or epoxy resin, and 0.1 to 3% by weight based on the paint resin solids content of silica, clay, calcium carbonate or a mixture thereof optionally surface-treated with a silane coupling agent, silicone oil, fatty acid, organic acid salt or ammonium salt.

Abstract: Disclosed is a golf ball having good shot feel and controllability as well as satisfactory flight performance and cut resistance. The golf ball has a core and a cover for covering the core, wherein said cover has a stiffness modulus of 100 to 250 MPa and comprises a heated mixture of an ionomer resin and a glycidyl group-modified styrene-based block copolymer having a JIS-A hardness of 30 to 90 as base resin, and optionally a maleic anhydride-modified olefin copolymer.

Abstract: Disclosed is a golf ball comprising a core 1 composed of a center 1a and an outer shell 1b, and a cover 2 covering said core 1, wherein a specific gravity of said center 1a is 0.2 to 1. The golf ball has excellent flying distance and satisfies other performances of golf balls.

Abstract: A solid golf ball comprising a core and a cover wherein the core has a diameter of not more than 36.7 mm and a hardness (JIS-C hardness) in a range from 65.5 to 72 from a center to an outer surface thereof. The core is formed from a vulcanized molded material of a rubber composition comprising a base rubber, a metal salt of an unsaturated carboxylic acid, an organic peroxide, an organosulfur compound and/or metal-containing organosulfur compound and a filler. A difference between the hardness (JIS-C hardness) at the center of the core and that at any part from the center to the outer surface of the core is not greater than 5. The cover has a specific gravity of less than 1.2, a thickness of 3 to 5 mm and a hardness (Shore-D scale hardness) of 60 to 70.

Abstract: Disclosed is a coated golf ball having a constant film thickness even at the edge part of the dimple.The coated golf ball is obtained by coating a paint on a golf ball having dimples on the surface. The paint is an polyurethane paint and/or epoxy resin paint and contains silica, clay, calcium carbonate or a mixture thereof in an amount of 0.1 to 3% by weight based on 100 parts by weight of the paint resin solid content.

Abstract: A golf ball has a surface uniformly covered with a paint coat so that carrying properties of dimples can be stably elicited. A paint to which is applied a voltage of more than 50,000 V is supplied to a disk revolving at a speed of more than 15,000 rpm for atomization, the atomized paint being coated on the surface of the golf ball to form a paint coat within a thickness range of 5 to 60 .mu.m, with a maximum/minimum coat thickness ratio of 1 to 2.

Abstract: The present invention provides a golf ball which is superior in shot feel and controllability, and is superior in flight performance, durability and cut resistance and also have sufficient safety. The golf ball comprises a solid center, a thread rubber layer formed on the solid center and a cover formed on the thread rubber layer,wherein the solid center is composed of an inner spherical rubber formed of a vulcanized molded rubber composition containing an oily substance, and a coating layer of an oil-resistant substance for coating around the inner spherical rubber so as to prevent the bleeding of the oily substance of the inner spherical rubber, andthe cover contains an ionomer resin as a main component and a cover composition constituting the cover has a stiffness modulus of from 70 to 280 MPs.

Abstract: The present invention provides a golf ball which does not cause poor impact resilience but provides long distance carry as well as good hit feeling, and keeps controllability nearly similar to balata covered thread wound golf balls. The present invention provides a golf ball which comprises a core and a cover for covering the core, wherein the cover comprises, as base component, a mixture of a sulfonate-type ionomer of which a polymer chain contains an elastomeric portion having rubber resilience and has a sulfonic group neutralized by a metallic ion, and a carboxylate type ionomer which is a copolymer of at least .alpha.-olefin and .alpha.,.beta.-unsaturated carboxylic acid of which a carboxyl group is neutralized by a metallic ion.

Abstract: A method for grinding a surface of a golf ball and removing the thin outer layer thereof, wherein grinding tools arranged on three axes on a plane which axes radiate from a definite point at intervals of 120.degree. between one another are used. Each of the grinding tools possesses a circular grinding face which gradually spreads toward the end and contacts a surface of a golf ball. The grinding tools turn on the respective axes toward the same direction at the same speed keeping the same distance from the definite point.

Abstract: Disclosed is a golf ball having excellent hit feeling, control properties and flying performances. The golf ball has a core and a cover for covering the core. The base resin of the cover comprises a mixture of three specific resins (A), (B), and (C), and the cover has a stiffness modulus of 130 to 300 MPa and a Shore D hardness of 43 to 58. Resin (A) is a high rigid ionomer resin or resin mixture, Resin (B) is a moderate rigid ionomer resin or resin mixture, and Resin (C) is a low rigid copolymer resin.

Abstract: The present invention provides a rubber composition having high impact residence, preferred processability and workability which may be used for the manufacture of one-piece solid golf ball, solid core of multi-layered solid golf ball, solid center of thread-wound golf ball, etc. The rubber composition is characterized by that a rubber component is made from a mixture of:(1) 60 to 95 wt % of a polybutadiene containing at least more than 40% of cis-1,4 bond and having a Mooney viscosity [ML.sub.1+4 (100.degree. C.)] of 50 to 70, obtained by using lanthanum rare earth-based catalyst, nickel-based catalyst or cobalt-based catalyst, or a mixture thereof with another polybutadiene obtained by using a catalyst other than the above mentioned one, and(2) 5 to 40 wt % of a polyisoprene containing at least more than 90% of cis-1,4 bond and a Mooney viscosity of 70 to 90.