Abstract: A multi-piece solid golf ball including a relatively soft core, a very soft intermediate layer, and a thermoplastic resin-based cover harder than the intermediate layer by at least 20 Shore D units. The product (AxB) of the Shore D hardnesses of the cover and the intermediate layer and a dimple volume ratio VR (%) satisfy a specific relationship, and at least three types of dimples which are different in at least one of diameter, depth, and V0 are formed on the ball surface. The ball has a very soft pleasant feel upon approach shots and putting, ease of control upon iron shots, and a satisfactory trajectory and improved flight performance upon full shots with a driver.

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: 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: A solid golf ball has a solid core and a cover formed of a resin composition comprising the reaction product of a thermoplastic polyurethane elastomer with an isocyanate compound. The ball is efficiently moldable and meets such requirements as a pleasant feel, ease of control, high resilience, and minimized scuffs by iron shots.

Abstract: In a golf ball comprising a core, an intermediate layer, and a cover, the intermediate layer is formed mainly of a heated mixture of (A) a thermoplastic polyether ester elastomer having a Shore D hardness of 25-50, a tan.delta. value of 0.01-0.1 in the temperature range of -10.degree. C. to 20.degree. C. as determined by viscoelasticity measurement, and a Tg of not higher than -20.degree. C. and (B) an olefin elastomer, modified olefin elastomer, styrene-conjugated diene block copolymer or hydrogenated styrene-conjugated diene block copolymer having a JIS A hardness of 15-80. The ball has a good feel and an increased flight distance.

Abstract: In a golf ball comprising a core and a cover, the cover is predominantly constructed of a blend of (A) a coordination ionic copolymer of a divalent metal ion crosslinked form of an ethylene/unsaturated carboxylic acid/unsaturated carboxylate terpolymer and an amine compound and (B) a metal ion crosslinked form of an ethylene/unsaturated carboxylic acid copolymer. The ball has improved restitution and feel.

Abstract: The invention provides a golf ball comprising a core and a cover of inner and outer layers. The inner cover layer is mainly formed of a diamine complex ionomer resin obtained by reacting a divalent metal ion crosslinked form of an olefin-unsaturated carboxylic acid copolymer with an amine compound. The outer cover layer is mainly formed of an ionomer resin or non-ionomer thermoplastic elastomer. The ball is improved in restitution, control and feel at no sacrifice of durability.

Abstract: In a resin blend consisting essentially of (A) 90-10% by weight of an ionomer resin and (B) 10-90% by weight of a copolymer of ethylene and an .alpha.-olefin of at least 4 carbon atoms having a specific gravity of 0.86-0.92 and a dispersity (Mw/Mn) of up to 2.5, (C) a polyolefin having a polar group is blended in an amount of 0.5-20 parts by weight per 100 parts by weight of (A)+(B), yielding a cover stock for golf balls. Golf balls with a cover formed of this cover stock are improved in durability, impact resistance, flight performance, hitting feel and controllability.

Abstract: In a golf ball colored other than white, the color tone thereof as represented in accordance with the CIELAB color system has an L value of not less than 80, an a value of -30 to +30, and a b value of -30 to +30. The golf ball is preferably colored blue, green, pink, yellow, or orange. Usually, the cover layer of the golf ball is colored in order to color the golf ball. The golf ball does not cause a golfer to feel mental or visual incompatibility while addressing the ball, looks white as viewed from a distance, but looks other than white as viewed at close range to thereby distinguish itself from other balls. Also, the golf ball has improved fashionable features as compared with conventional color balls.

Abstract: In a golf ball comprising a core and a cover, the cover is mainly composed of a resin consisting of a first ionomer in the form of a sodium neutralized ethylene/methacrylic acid/acrylate terpolymer having a flexural modulus of 1,000 to 15,000 psi and a second ionomer in the form of a magnesium neutralized ethylene/methacrylic acid copolymer having a flexural modulus of 20,000 to 48,000 psi. The blend has a Shore C hardness of 65 to 77. The ball has a soft feel, satisfactory spin rate, improved scuff resistance upon iron shots, and durability against top hitting with an excellent compatibility in cover.

Abstract: The invention provides a golf ball comprising a solid core, an intermediate layer, and a cover. The cover is formed of a diamine complex ionomer resin having a flexural rigidity of 340-410 MPa. The intermediate layer is formed of an ionomer resin or non-ionomer thermoplastic elastomer having a flexural rigidity of 20-350 MPa. The hardness of the ball is adjusted to a distortion of 2.6-4.5 mm under a load of 100 kg.

Abstract: A golf ball having a cover is provided. The cover is formed of a cover stock comprising a thermoplastic resin or elastomer and fibrous aluminum borate whiskers. The cover is durably resistant to damages by iron shots.

Abstract: A golf ball comprises a core and a cover enclosing the core. The cover resin is composed mainly of a thermoplastic polyurethane elastomer having an aliphatic diisocyanate component and exhibiting a tan .delta. peak temperature of not higher than -20.degree. C. in viscoelasticity measurement.

Abstract: A golf ball is provided having a solid core which is formed of a core stock comprising a thermoplastic resin or elastomer and fibrous aluminum borate whiskers. The ball is improved in restitution. Particularly, the one-piece golf ball is durably resistant to damages by iron shots.

Abstract: In a golf ball comprising a core, an intermediate layer, and a cover, the intermediate layer is formed of a resin component consisting essentially of 10-60 parts by weight of a thermoplastic elastomer having a crystalline polyethylene block and 90-40 parts by weight of an ionomer resin having a melt index of 3-20 g/10 min. at 190.degree. C. The resin component is easily moldable into a highly resilient intermediate layer. The ball has improved flight performance, durability and feel.