Abstract: The invention provides a golf ball cover stock based on a heated mixture of (a) an ionomer resin, (b) polyethylene, and (c) an epoxy group-modified polyolefin or (d) a low molecular weight polyethylene wax. Component (c) or (d) improves the dispersion of polyethylene in the ionomer resin so that a larger amount of polyethylene may be blended in micro-dispersion form. A golf ball having a cover made of the cover stock is durable and wear resistant and offers a good feel when hit.

Abstract: A golf ball is formed with a resin composition which contains 5 to 95 weight % of a polyester block copolymer (A) and 95 to 5 weight % of an ionomer resin (B); and a (polyester-aromatic vinyl based copolymer) block copolymer (C), which is mixed with both the polyester block copolymer (A) and the ionomer resin (B) in an amount of 1 to 40 parts by weight on the basis of 100 parts by weight of the total of the polyester block copolymer (A) and the ionomer resin (B). The polyester block copolymer (A) mainly contains a high-melting point crystalline polymer segment (a1) composed of a crystalline aromatic polyester unit, and a low-melting point polymer segment (a2) composed of an aliphatic polyether unit and/or an aliphatic polyester unit. The ionomer resin (B) is produced by neutralizing a copolymer mainly containing an &agr;-olefine (b1) and an &agr;,&bgr;-unsaturated carboxylic acid (b2) having 3 to 8 carbon atoms with at least one metal ion (b3) selected from univalent, divalent, and trivalent metal ions.

Abstract: A layer of a golf ball is formed of a golf ball-forming composition in which a silicone rubber powder, silicone resin powder or composite powder thereof is blended in an elastomer, resin or butadiene rubber base. The composition is easy to remove from a mold after molding, and the golf ball has advantages including high durability against consecutive strikes, and good feel and rebound even at low temperature.

Abstract: A multi-piece solid golf ball featuring an increased flight distance, superior control, good feeling, and improved durability is provided. A multi-piece solid golf ball comprising a solid core and a cover of two inner and outer layers surrounding the core is characterized in that the solid core has a distortion of at least 2.4 mm under an applied load of 100 kg, the inner cover layer is formed mainly of an ionomer resin to a Shore D hardness of 28-58, and the outer cover layer is formed mainly of a thermoplastic polyurethane elastomer to a Shore D hardness of 30-55.

Abstract: The invention provides a golf ball cover stock based on a heated mixture of (a) an ionomer resin, (b) polyethylene, and (c) an epoxy group-modified polyolefin or (d) a low molecular weight polyethylene wax. Component (c) or (d) improves the dispersion of polyethylene in the ionomer resin so that a larger amount of polyethylene may be blended in micro-dispersion form. A golf ball having a cover made of the cover stock is durable and wear resistant and offers a good feel when hit.

Abstract: A multi-piece solid golf ball featuring an increased flight distance, superior control, good feeling, and improved durability is provided. A multi-piece solid golf ball comprising a solid core and a cover of two inner and outer layers surrounding the core is characterized in that the solid core has a distortion of at least 2.7 mm under an applied load of 100 kg, the inner cover layer is formed mainly of a thermoplastic polyester elastomer, the outer cover layer is formed mainly of a thermoplastic polyurethane elastomer, one or more ionomer resins having a Shore D hardness of at least 55 are mixed with either one or both of the thermoplastic polyester elastomer of the inner cover layer and the thermoplastic polyurethane elastomer of the outer cover layer, the inner cover layer has a Shore D hardness of 28-58, and the outer cover layer has a Shore D hardness of 30-55.

Abstract: A cover stock composed mainly of a heated mixture of a thermoplastic polyurethane elastomer and a polyolefin oligomer or polyolefin which has been modified with functional groups is suitable for the manufacture of golf balls. The cover made of the stock has improved scuff resistance.

Abstract: A golf ball material containing (a) a calcium ion-neutralized olefin-unsaturated carboxylic acid-unsaturated carboxylate random copolymer having an acid content of 2-12% by weight, and (b) a calcium ion-neutralized olefin-unsaturated carboxylic acid random copolymer having an acid content of 8-15% by weight, in a weight ratio from 100:0 to 40:60, and having a Shore D hardness of 30-60 is effectively moldable and is capable of providing golf balls with excellent rebound energy and a pleasant feel when hit.

Abstract: A cover stock composed mainly of a heated mixture of a thermoplastic polyurethane elastomer and a polyolefin oligomer or polyolefin which has been modified with functional groups is suitable for the manufacture of golf balls. The cover made of the stock has improved scuff resistance.

Abstract: A multi-piece solid golf ball featuring an increased flight distance, superior control, good feeling, and improved durability is provided. A multi-piece solid golf ball comprising a solid core and a cover of two inner and outer layers surrounding the core is characterized in that the solid core has a distortion of at least 2.7 mm under an applied load of 100 kg, the inner cover layer is formed mainly of a thermoplastic polyester elastomer to a Shore D hardness of 28-58, and the outer cover layer is formed mainly of a thermoplastic polyurethane elastomer to a Shore D hardness of 30-55.

Abstract: In a multi-piece solid golf ball comprising a solid core and a cover consisting of inner and outer layers, the cover inner layer is composed mainly of an ionomer resin, and the cover outer layer is composed mainly of another thermoplastic elastomer. A thermoplastic resin-base adhesive layer is interposed between the cover inner and outer layers, or a thermoplastic resin-base adhesive is blended in the inner and/or outer layer cover stock.

Abstract: In a multilayer structure solid golf ball having a solid core, an intermediate layer, and a cover, the intermediate layer is formed mainly of a thermoplastic polyurethane elastomer, and the cover is formed mainly of an ionomer resin. An adhesive layer intervenes between the intermediate layer and the cover. The ball has improved rebound and spin properties.

Abstract: In a solid golf ball having a solid core, a cover inner layer and a cover outer layer, the inner layer is formed of a thermoplastic resin containing 60-100% by weight of an ionomer resin neutralized with a monovalent metal salt, and the outer layer is formed of a thermoplastic resin containing 60-100% by weight of an ionomer resin neutralized with a divalent metal salt. The difference in Shore D hardness between the inner and outer layers is within 5 Shore units. While maintaining superior flight performance and durability, the inventive ball presents a more pleasant feel.

Abstract: The invention provides a solid golf ball comprising a solid core and a cover, a wound golf ball comprising a solid center, thread rubber and a cover, or a one-piece golf ball. The solid core, the solid center or the one-piece golf ball is formed mainly of a heated mixture of (A) a thermoplastic polyether ester elastomer having a Shore D hardness of 25-60, a tan &dgr; value of 0.01-0.15 in the temperature range of −10° C. to 20° C. as determined by viscoelasticity measurement, and a Tg≦−20° C. and (B) an olefin elastomer, modified olefin elastomer, styrene-conjugated diene block copolymer or hydrogenated or modified styrene-conjugated diene block copolymer having a JIS A hardness of 20-80. The golf ball is unsusceptible to compression set and plastic deformation and has a high resilience, pleasant feel and increased distance.

Abstract: A multi-piece solid golf ball comprises a solid core and a cover of two inner and outer layers surrounding the core. The solid core has a distortion of at least 2.4 mm under an applied load of 100 kg. The inner cover layer is formed mainly of an ionomer resin to a Shore D hardness of 28-58, and the outer cover layer is formed mainly of a thermoplastic polyester elastomer to a Shore D hardness of 28-55.

Abstract: In a multi-piece solid golf ball comprising a solid core and a cover of at least two layers, one layer, preferably an inner layer, of the cover is formed mainly of a thermoplastic polyurethane elastomer having a JIS A hardness of 60-98 and a resilience of at least 40%. The golf ball is improved in spin properties, flight performance, feeling, durability, and mass-scale productivity.

Abstract: In a multi-piece solid golf ball comprising a solid core, an intermediate layer, and a cover, the core at its surface has a Shore D hardness Hs of less than 55, the intermediate layer has a Shore D hardness Hm, and the cover has a Shore D hardness Hc, which satisfy 0.6<Hm/Hs<1.0 and 1.2<Hc/Hm<2.0. The intermediate layer is formed mainly of a polyurethane resin, and the cover is formed mainly of an ionomer resin. The ball has a soft feel, satisfactory distance coverage, and durability, and is improved in spin properties.

Abstract: In a golf ball comprising a core and a cover, the cover is composed mainly of a blend of a soft ionomer in the form of a magnesium ion neutralized ethylene/(meth)acrylic acid/acrylate terpolymer and a hard ionomer in the form of a magnesium ion neutralized ethylene/(meth)acrylic acid copolymer. The blend has a Shore D hardness of 44-60. The ball is minimized in restitution loss and has an increased initial velocity, spin receptivity, good hitting feel, and scuff resistance.

Abstract: In a multi-piece solid golf ball comprising a solid core, an intermediate layer, and a cover, the solid core has a diameter of 28-40 mm and a specific gravity of less than 1.3, the intermediate layer is formed mainly of a polyurethane resin and has a Shore D hardness of 25-50 and a specific gravity of 1.1-2.0 and greater than that of the solid core, and the cover is formed mainly of an ionomer resin and has a gage of 0.5-3.2 mm and a Shore D hardness of 45-68. The golf ball offers a satisfactory flight distance and soft feel and is improved in spin properties.

Abstract: In a multi-piece solid golf ball comprising a solid core, an intermediate layer, and a cover, the core at its surface has a Shore D hardness Hs of less than 55, the intermediate layer has a Shore D hardness Hm, and the cover has a Shore D hardness Hc, which satisfy 1.0<Hm/Hs<1.4 and 1.0<Hc/Hm<2.0. The intermediate layer is formed mainly of a polyurethane resin, and the cover is formed mainly of an ionomer resin. The ball has satisfactory distance coverage, durability, and soft feel, and is improved in spin properties.