Abstract: In a golf ball having a core and a cover of at least one layer, the outermost layer of the cover is formed of a resin composition that includes (A) 100 parts by weight of a thermoplastic resin, and (B) 1 to 30 parts by weight of a compound having a fluorene skeleton, or a derivative thereof, and the resin composition has a melt flow rate of at least 3.0 g/10 min. This resin composition for golf balls has an improved injection-moldability and thus enables the ball to achieve both a reduced spin rate and a good durability (scuff resistance).

Abstract: In a golf ball having a core of at least one layer and a cover of at least one layer, an outermost layer of the cover is formed of an ionomer resin composition which includes specific amounts of (a) an olefin-?,?-unsaturated carboxylic acid copolymer and/or a metal ion neutralization product thereof, or an olefin-?,?-unsaturated carboxylic acid-?,?-unsaturated carboxylic acid ester copolymer and/or a metal ion neutralization product thereof, (b) an oxazoline group-containing polymer, (c) an inorganic filler, and (d) a colorant which includes a fluorescent dye or a fluorescent pigment. This golf ball has a translucent appearance that holds down transparency of the ball surface to a suitable level and undergoes relatively little change in color when fading occurs due to sunlight exposure, and is thus both weather resistant and decorative.

Abstract: In a golf ball having a core and a cover of at least one layer, the outermost layer of the cover is formed of a resin composition that includes (A) 100 parts by weight of a thermoplastic resin, and (B) 1 to 30 parts by weight of a compound having a fluorene skeleton, or a derivative thereof, and the resin composition has a melt flow rate of at least 3.0 g/10 min. This resin composition for golf balls has an improved injection-moldability and thus enables the ball to achieve both a reduced spin rate and a good durability (scuff resistance).

Abstract: In a golf ball having a core of at least one layer and a cover of at least one layer, an outermost layer of the cover is formed of an ionomer resin composition which includes specific amounts of (a) an olefin-?,?-unsaturated carboxylic acid copolymer and/or a metal ion neutralization product thereof, or an olefin-?,?-unsaturated carboxylic acid-?,?-unsaturated carboxylic acid ester copolymer and/or a metal ion neutralization product thereof, (b) an oxazoline group-containing polymer, (c) an inorganic filler, and (d) a colorant which includes a fluorescent dye or a fluorescent pigment. This golf ball has a translucent appearance that holds down transparency of the ball surface to a suitable level and undergoes relatively little change in color when fading occurs due to sunlight exposure, and is thus both weather resistant and decorative.

Abstract: A golf ball material which includes (A) a resin mixture containing as the base resin an acid copolymer in which from 90 to 100 mol % of the acid groups are neutralized with metal ions, and (B) an oxazoline group-containing polymer has a low hardness and a soft feel, and moreover possesses a high rebound resilience. This golf ball material is particularly useful when formed as the intermediate layer in a golf ball having a core, an intermediate layer and an outermost layer with numerous dimples formed on the surface thereof.

Abstract: In a golf ball having a core and a cover of at least one layer, the core and/or at least one layer of the cover are formed of a resin composition that includes (A) 100 parts by weight of a thermoplastic resin, and (B) 1 to 30 parts by weight of a compound having a fluorene skeleton, or a derivative thereof. This resin composition for golf balls has an improved injection-moldability and thus enables the ball to achieve both a reduced spin rate and a good durability (scuff resistance).

Abstract: A golf ball material includes (A) one or more resin ingredient selected from the group consisting of olefin-unsaturated carboxylic acid random copolymers, olefin-unsaturated carboxylic acid-unsaturated carboxylic acid ester random copolymers, and metal ion neutralization products of these copolymers; (D) an amino compound having at least 2 amino groups per molecule; (B) one or more resin ingredient selected from the group consisting of polyethylene, polyesters and polyamide elastomers; and (C) an agent for compatibilizing components (A) and (B). The compatibilizing agent (C) includes: (C-i) two different types of base polymer selected from a specific group, (C-ii) a hydrogenated diene polymer having at least one type of functional moiety selected from a specific group of moieties, and (C-iii) an olefinic polymer having at least one type of functional moiety selected from a specific group of moieties.

Abstract: In a golf ball having a core and a cover consisting of a plurality of layers that encases the core, adhesion between adjoining cover layers is improved by judicious selection of the materials making up the cover layers, providing the ball with an improved durability to impact without diminishing the ball initial velocity.

Abstract: In a golf ball having a core and a cover of at least one layer, the core and/or at least one layer of the cover are formed of a resin composition that includes (A) 100 parts by weight of a thermoplastic resin, and (B) 1 to 30 parts by weight of a compound having a fluorene skeleton, or a derivative thereof. This resin composition for golf balls has an improved injection-moldability and thus enables the ball to achieve both a reduced spin rate and a good durability (scuff resistance).

Abstract: In a golf ball having a core and a cover of one or a plurality of layers that encases the core, the core or at least one layer of the cover is formed of a resin composition which contains from 5 to 250 parts by weight of a mechanoluminescent material that receives mechanical energy and luminesces per 100 parts by weight of a base material which is a rubber material or a resin material. This golf ball has an excellent visibility in that, even under dark conditions, the ball impact site can be clearly confirmed visually at the time of impact. Moreover, the ball is able to maintain a good scuff resistance.

Abstract: A golf ball resin composition contains a base resin for which, in dynamic viscoelasticity measurement, the storage modulus of the base resin measured at 23° C., 15 Hz and 1.0% strain, and tan ? determined under the same conditions, satisfy specific values; and for which the storage modulus of the base resin measured at 23° C., 15 Hz and 10% strain, and tan ? determined under the same conditions, satisfy specific values. By using this resin composition as a golf ball cover material, the force delivered to the ball while the ball and the clubface are in contact from impact to follow-through is more easily felt, facilitating distance control of the ball. Controllability with a short iron such as a sand wedge around the green is also excellent.

Abstract: A golf ball material includes (A) one or more resin ingredient selected from the group consisting of olefin-unsaturated carboxylic acid random copolymers, olefin-unsaturated carboxylic acid-unsaturated carboxylic acid ester random copolymers, and metal ion neutralization products of these copolymers; (D) an amino compound having at least 2 amino groups per molecule; (B) one or more resin ingredient selected from the group consisting of polyethylene, polyesters and polyamide elastomers; and (C) an agent for compatibilizing components (A) and (B). The compatibilizing agent (C) includes: (C-i) two different types of base polymer selected from a specific group, (C-ii) a hydrogenated diene polymer having at least one type of functional moiety selected from a specific group of moieties, and (C-iii) an olefinic polymer having at least one type of functional moiety selected from a specific group of moieties.

Abstract: In a golf ball having a core of at least one layer and a cover of at least one layer, at least one core or cover layer contains a butyl rubber ionomer. A method of manufacturing golf balls having a core of at least one layer and a cover of at least one layer includes the steps of preparing a treatment solution of butyl rubber ionomer dissolved in a solvent, applying the treatment solution to at least one layer of the golf ball, and covering the treated layer with, as an outer layer adjoining thereto, a rubber layer, a resin layer or a paint layer. With this golf ball and golf ball manufacturing method, adhesion between the layers can be improved, enabling the durability of the ball to cracking on impact to be increased.

Abstract: A golf ball material includes (A) one, two or more resin ingredients selected from among olefin-unsaturated carboxylic acid random copolymers, olefin-unsaturated carboxylic acid-unsaturated carboxylic acid ester random copolymers, and metal ion neutralization products of these copolymers, (B) one two or more resin ingredients selected from among polyethylenes, ethylene-vinyl acetate copolymers and polyesters, and (C) the specific agent for compatibilizing components (A) and (B).

Abstract: A golf ball resin composition includes (A) (I) an olefin-C3-8 ?,?-unsaturated carboxylic acid copolymer or a metal neutralization product thereof and/or (II) an olefin-C3-8 ?,?-unsaturated carboxylic acid-C3-8 ?,?-unsaturated carboxylic acid ester terpolymer or a metal neutralization product thereof; (B) isocyanuric acid or a haloisocyanuric acid; and (C) a fatty acid or a fatty acid metal salt. When this resin composition is used as a cover material, the paint film adhesion between the cover material and various types of paint, including urethane-based paints, is excellent, enabling various properties of the golf ball to be improved.

Abstract: In a golf ball having a core of at least one layer and a cover of at least one layer, some or all of the surface of at least one such layer of the ball is treated with a treatment solution. The treatment solution is made of (A) a polyolefin-based thermoplastic resin and (B) at least one solvent selected from the group consisting of water, ammonia water and organic solvents, and is obtained by dissolving or finely dispersing resin solids of component A in the solvent of component B. The golf ball has an improved adhesion between the layers, enabling the durability of the ball to cracking on impact to be increased.

Abstract: A golf ball material includes specific amounts of two base resins: (A) an olefin-unsaturated carboxylic acid-unsaturated carboxylic acid ester ternary copolymer, or a metal neutralization product thereof, having a specific weight-average molecular weight, acid content and ester content, and (B) an olefin-acrylic acid random binary copolymer, or a metal neutralization product thereof, having a specific weight-average molecular weight and acid content, and additionally includes (C) a basic inorganic metal compound, and (D) an anionic surfactant. Resins A and B have specific melt flow rates (MFR) and a specific MFR difference therebetween. Molded products obtained from the overall composition have a specific hardness. A method of producing such a material is also provided. In golf balls, this material is able to maintain a good ball rebound and durability, has a good flowability during molding, and moreover is capable of minimizing molding defects due to gas evolution, increasing productivity.

Abstract: A golf ball resin composition contains a base resin for which, in dynamic viscoelasticity measurement, the storage modulus of the base resin measured at 23° C., 15 Hz and 1.0% strain, and tan ? determined under the same conditions, satisfy specific values; and for which the storage modulus of the base resin measured at 23° C., 15 Hz and 10% strain, and tan ? determined under the same conditions, satisfy specific values. By using this resin composition as a golf ball cover material, the force delivered to the ball while the ball and the clubface are in contact from impact to follow-through is more easily felt, facilitating distance control of the ball. Controllability with a short iron such as a sand wedge around the green is also excellent.

Abstract: A golf ball resin composition includes (A) (I) an olefin-C3-8 ?,?-unsaturated carboxylic acid copolymer or a metal neutralization product thereof and/or (II) an olefin-C3-8 ?,?-unsaturated carboxylic acid-C3-8 ?,?-unsaturated carboxylic acid ester terpolymer or a metal neutralization product thereof; (B) isocyanuric acid or a haloisocyanuric acid; and (C) a fatty acid or a fatty acid metal salt. When this resin composition is used as a cover material, the paint film adhesion between the cover material and various types of paint, including urethane-based paints, is excellent, enabling various properties of the golf ball to be improved.

Abstract: In a golf ball having a core of at least one layer and a cover of at least one layer, at least one core or cover layer contains a butyl rubber ionomer. A method of manufacturing golf balls having a core of at least one layer and a cover of at least one layer includes the steps of preparing a treatment solution of butyl rubber ionomer dissolved in a solvent, applying the treatment solution to at least one layer of the golf ball, and covering the treated layer with, as an outer layer adjoining thereto, a rubber layer, a resin layer or a paint layer. With this golf ball and golf ball manufacturing method, adhesion between the layers can be improved, enabling the durability of the ball to cracking on impact to be increased.