Abstract: A scratch resistant golf ball cover comprising a blend of:(I) an acrylic ionomer or mixture with a methacrylic ionomer having a stiffness modulus of 3000-5000 Kg/cm.sup.2(II) a methacrylic ionomer having a stiffness modulus of 900-2000 Kg/cm.sup.2 neutralized with zinc.

Abstract: The present invention provides a golf ball having small impact force when hitting, good shot feel and excellent flight performances. The solid golf ball of the present invention comprises a core and a cover covering the core, wherein the core is obtained from a rubber composition comprising 100 parts by weight of cis-1,4-polybutadiene and 10 to 25 parts by weight of a metal salt of an unsaturated carboxylic acid, the core has a deformation of 3.5 to 6.5 mm when a weight load from an initial loading of 10 kg to a final loading 130 kg is applied to the core, and the cover has a stiffness modulus of 4,500 to 6,000 kg/cm.sup.2 at 23.degree. C. and a thickness of 3.2 to 5 mm.

Abstract: A golf ball comprising a molded core and a cover about the core. The core and cover have a combined weight of between 47 grams and 53 grams, a coefficient of restitution of at least substantially 0.800, and a Riehle compression between 0,037 inch and 0.045 inch.. The outside diameter of the ball is at least substantially 1.62 inches and less than 1.68 inches.

Abstract: A two-piece golf ball which consists essentially of a core and a cover covering the core, wherein said core is made of a rubber composition comprising 100 parts by weight of a base rubber, 20 to 45 parts by weight of a co-crosslinking agent and 0.3 to 5.0 parts by weight of an organic peroxide, a hardness of the core is within a range of 40 to 56 in the vicinity of its center and 70 to 95 in the vicinity of its surface; a difference between a hardness in the vicinity of the surface and that in the vicinity of the center is within a range of 20 to 40; and a compression deformation amount formed between initial loading 10 kg and final loading 130 kg is 3.1 to 4.5 mm; said hardness being measured by means of JIS-C type hardness tester.

Abstract: A two-piece golf ball, comprising:a core having a surface hardness of 55 to 75 and a sectional hardness at the location other than the core surface layer of 65 to 88, said hardness value being determined by a JIS-C type hardness tester; anda cover covering said core and having a stiffness of 1,000 to 3,000 kg/cm.sup.2 ;wherein said golf ball exhibits a contact area S between itself and a clubface, when hit with a driver at a head speed of 40 m/second, of 4.3 to 5.0 cm.sup.2, S being determined by the equation:S=.pi.(1/2{(a+b)/2}).sup.2wherein a is a transverse diameter of the contact area and b is a longitudinal diameter of the contact area.

Abstract: A solid golf ball includes a solid core enclosed in a cover. The resin component of the cover consists of 30 to 100% by weight of an ethylene-methacrylic acid-acrylate terpolymer ionomer resin having a flexural modulus of 2,500-14,000 psi and a Shore D hardness of 20-59 and 70 to 0% by weight of an ethylene-(meth)acrylic acid copolymer ionomer resin having a flexural modulus of 20,000-29,000 psi and a Shore D hardness of 56-62. The ball is excellent in spin receptivity, burring resistance, and feel on hitting.

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.

Abstract: The present invention provides a one-piece solid golf ball or a two or more piece solid golf ball which comprises an inner core and a cover covering the inner core. The one-piece solid golf ball is formed from a rubber composition which comprises:a base rubber,vulcanized rubber powder, anda vulcanizing agent.The two or more piece solid golf ball comprises an inner core and a cover covering the inner core, the inner core being composed of either one uniform rubber material or a combination of a center and one or more outer layers disposed over the center, wherein one or more rubber portions of the inner core are formed from a rubber composition comprising:a base rubber,vulcanized rubber powder, anda vulcanizing agent.

Abstract: The objective of the present invention is to bring hit feeling of two-piece balls closer to that of thread-wound golf balls. The two-piece golf ball of the present invention comprises a core formed from a rubber composition comprising a base rubber, a co-crosslinking agent and an organic peroxide, and a cover covering the core, wherein said core has the following hardness distribution when measured by a JIS-C hardness meter;(1) hardness at a center: 58-73(2) hardness at 5-10 mm from the center: 68-78(3) hardness at 15 mm from the center: 76-88(4) surface hardness: 78-88(in the hardness distribution, hardness (2) is substantially constant being within the above range, of which tolerance is within .+-.3 and the other values satisfy the relation of (1)<(2)<(3).ltoreq.(4) ), a compression deformation of the core is 2.8-3.5 mm when pressurized by an initial load of 10 kg up to a final load of 130 kg and said cover has a thickness of 1.5-1.9 mm.

Abstract: Disclosed is a solid golf ball containing at least one rubber portion formed from a rubber composition comprising a base rubber, a co-crosslinking agent and an organic peroxide; an improvement being present in that the base rubber is a mixture of(A) a solid polybutadiene rubber containing cis-1,4 bonds in an amount of at least 40%, and(B) either a liquid polybutadiene rubber or a liquid isoprene-butadiene copolymer rubber, or both.