Sumitomo Rubber Industries Limited

Dunlop Sports Company Limited

Masanori Taguchi

Kazuyoshi Shiga

Takahiro Shigemitsu

Hiroshi Tadaoka

Hiroaki Tanaka

Kunio Niwa

Takehiko Hyodo

Fumiya Suzuki

Kohei Mimura

Yuko Sakurai

Yuko Kujirai

Shoichi Kutsumizu

Yohei Miwa

Yuta Shimane

An aqueous adhesive for rubber includes rubber latex and an ammonium-salt-based vulcanization acceleration aid. An amount of the ammonium-salt-based vulcanization acceleration aid contained in the aqueous adhesive is preferably not less than 0.01% by weight and not greater than 5.0% by weight in terms of solid content. An aqueous adhesive for a ball includes rubber latex as a main component. A content of an inorganic filler in the aqueous adhesive is not greater than 0.1% by weight in terms of solid content. A ballincludes a hollow coreobtained by crosslinking a rubber composition that contains a vulcanizing agent. The coreis formed of two hemispherical half cores. The two half cores are adhered to each other by using the aqueous adhesive for a ball.

Aqueous adhesive for rubber and aqueous adhesive for ball

A rubber composition for a hollow ball includes a base rubber and an inorganic filler. A weight reduction rate TGAfrom room temperature to 650&#xb0; C. and a weight reduction rate TGAfrom room temperature to 850&#xb0; C. of the rubber composition are measured under an air atmosphere by thermogravimetry conforming to JIS K0129. The weight reduction rate TGAof the rubber composition is not less than 63% and not greater than 99%. A difference (TGA&#x2212;TGA) between the weight reduction rates TGAand TGAof the rubber composition is not less than 0% and not greater than 7%. A hollow ballincludes a hollow coreformed from the rubber composition.

Rubber composition for hollow ball and hollow ball

A rubber composition for a tennis ball includes a base rubber and a filler having a degree of flatness DL of not less than 50, the degree of flatness DL being obtained by dividing an average particle diameter D(&#x3bc;m) of the filler by an average thickness T (&#x3bc;m) of the filler. An amount of the filler per 100 parts by weight of the base rubber is not less than 1 part by weight and not greater than 150 parts by weight. A gas permeability coefficient GPS and a loss tangent tan &#x3b4;S of the rubber composition and a gas permeability coefficient GPL and a loss tangent tan &#x3b4;L of a rubber composition obtained by replacing the filler with kaolin clay having a degree of flatness DL of 20 satisfy (1): GPL/GPS&#x2265;1.02 and (2): |tan &#x3b4;L&#x2212;tan &#x3b4;S|&#x2264;0.03. A tennis ballincludes a coreformed using the rubber composition.

Rubber composition for tennis ball and tennis ball

A rubber composition for a tennis ball includes a base rubber and a high-flatness filler. The high-flatness filler has an average particle diameter Dof not less than 1 &#x3bc;m and not greater than 50 &#x3bc;m. A degree of flatness DL is not less than 40 and not greater than 200. An amount of the high-flatness filler per 100 parts by weight of the base rubber is not less than 5 parts by weight and not greater than 100 parts by weight. A ratio (E2/E1) of a tensile elastic modulus E2 in a tensile strain range from 70% to 100% to a tensile elastic modulus E1 in a tensile strain range from 10% to 30%, of a vulcanized rubber obtained by vulcanizing the rubber composition, is not less than 0.60 and less than 1.00. The tennis ball includes a hollow core formed from the rubber composition.

Rubber composition for tennis ball

A rubber composition for a hollow ball includes a base rubber, an inorganic filler composed of a large number of flat particles, and a carbon-based filler. As to the carbon-based filler, a degree of flatness DLc obtained by dividing an average particle diameter D(&#x3bc;m) by an average thickness Tc (&#x3bc;m) is not less than 50. A weight ratio Mc/Mi is not less than 0.01 and not greater than 1.00. The rubber composition is obtained by a production method including: a first step of mixing the base rubber and the carbon-based filler to obtain a master batch; and a second step of adding the large number of flat particles that form the inorganic filler, to the master batch to orient the large number of flat particles. The hollow ballincludes a coreformed from the rubber composition.

An object of the present invention is to provide a golf ball resin composition excellent in resilience. Another object of the present invention is to provide a golf ball excellent in rebound resilience and shot feeling. The present invention provides a golf ball resin composition comprising: (A) at least one resin component selected from the group consisting of (a-1) a binary copolymer, (a-2) a binary ionomer resin, (a-3) a ternary copolymer, and (a-4) a ternary ionomer resin, (B) a saturated fatty acid, and (C) an unsaturated fatty acid, wherein a total content of (B) the saturated fatty acid and (C) the unsaturated fatty acid ranges from 100 parts by mass to 200 parts by mass with respect to 100 parts by mass of (A) the resin component.

Golf ball resin composition and golf ball

An object of the present invention is to provide a golf ball exhibiting an excellent shot feeling and resilience, and a constituent material thereof. The present invention provides a golf ball resin composition having a bending stiffness (M) ranging from 300 kgf/cmto 24,000 kgf/cmat a bending angle from 3&#xb0; to 12&#xb0;, a ratio (M/M) of the bending stiffness (M) at the bending angle from 3&#xb0; to 12&#xb0; to a bending stiffness (M) at a bending angle from 24&#xb0; to 30&#xb0; ranging from 0.20 to 2.00, and a slab hardness ranging from 30 to 65 in Shore D hardness.

An object of the present invention is to provide a golf ball resin composition having a high resilience, flexibility and high fluidity. The present invention provides a golf ball resin composition having a bending stiffness (M) ranging from 600 kgf/cmto 5,000 kgf/cmwithin a bending angle from 21&#xb0; to 30&#xb0;, a rebound resilience (R) of 50% or more, a slab hardness (Shore D) ranging from 40 to 65, a melt flow rate (190&#xb0; C., 2.16 kgf) of 1.0 g/10 min or more, and a resilience index value ((M)&#xd7;(R/100)) of 8.5 or more.

An object of the present invention is to provide a golf ball resin composition having an excellent rebound resilience. The present invention provides a golf ball resin composition containing an ionomer resin as a resin component. In a DSC measurement (a measuring atmosphere: a nitrogen atmosphere, a measuring temperature range: from &#x2212;50&#xb0; C. to 150&#xb0; C., and a temperature rising rate: 10&#xb0; C./min) of the golf ball resin composition of the first embodiment, a first endothermic peak and a second endothermic peak appear, and a peak top temperature (Ti) of the first endothermic peak is equal to or lower than a peak top temperature (Tm) of the second endothermic peak and the peak top temperature (Ti) ranges from 60&#xb0; C. to 70&#xb0; C.

An object of the present invention is to provide a golf ball resin composition having high resilience and flexibility. The present invention provides a golf ball resin composition, comprising (A) at least one resin component selected from the group consisting of (a-1) a binary copolymer, (a-2) an ionomer resin consisting of a metal ion-neutralized product of a binary copolymer, (a-3) a ternary copolymer, and (a-4) an ionomer resin consisting of a metal ion-neutralized product of a ternary copolymer, (B) a saturated fatty acid, (C) an unsaturated fatty acid, and (D) an unsaturated aliphatic polycarboxylic acid; comprising (B) the saturated fatty acid, (C) the unsaturated fatty acid and (D) the unsaturated aliphatic polycarboxylic acid in a total amount ranging from 80 parts by mass to 200 parts by mass with respect to 100 parts by mass of (A) the resin component; and having a neutralization degree of more than 80 mole %.

An object of the present invention is to provide a golf ball resin composition having high resilience and flexibility. The present invention provides a golf ball resin composition, comprising (A) at least one resin component selected from the group consisting of (a-1) a binary copolymer, (a-2) an ionomer resin consisting of a metal ion-neutralized product of a binary copolymer, (a-3) a ternary copolymer, and (a-4) an ionomer resin consisting of a metal ion-neutralized product of a ternary copolymer, (B) a saturated fatty acid, (C) an unsaturated fatty acid, and (D) a carboxyl group modified diene polymer having at least two carboxyl groups and/or an anhydride of the carboxyl groups; and having a neutralization degree of more than 80 mole %, wherein a total amount of (B) the saturated fatty acid, (C) the unsaturated fatty acid and (D) the carboxyl group modified diene polymer ranges from 100 parts by mass to 200 parts by mass with respect to 100 parts by mass of (A) the resin component.

The present invention provides resin compositions for golf balls which have excellent flexibility, fluidity, and resilience, and golf balls formed from the resin compositions. The present invention relates to a resin composition for golf balls including a polymer that contains a diene polymer moiety and a carboxylic acid-based moiety wherein carboxyl groups derived from the carboxylic acid-based moiety are neutralized.

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Kobe, Japan

Masanori Taguchi