Sumitomo Rubber Industries Limited

Dunlop Sports Company Limited

Dunlap Sports Co. Ltd.

Sho Goji

Kazuyoshi Shiga

Chiemi Mikura

Toshiyuki Tarao

Kuniyasu Horiuchi

Hidetaka Inoue

Hiroshi Hasegawa

Hitoshi Oyama

Ryota Sakamine

Ayaka Shindo

Takehiko Hyodo

The aqueous adhesive for a tennis ball includes rubber latex. The rubber latex is a mixture of liquid rubber latex and solid rubber latex. A ratio of liquid rubber to an entire rubber component contained in the rubber latex is greater than 20% by weight and less than 90% by weight in terms of solid content. The tennis ball includes a seam formed of the aqueous adhesive for a tennis ball.

Aqueous adhesive for tennis ball

The aqueous adhesive for a tennis ball includes rubber latex. The rubber latex is a mixture of liquid rubber latex and solid rubber latex. When a solid content in the aqueous adhesive is measured at a temperature of 140° C. by a curelastometer, a torque is not less than 0.26 N·m after 10 minutes from start of heating. The tennis ball includes a seam portion formed of the aqueous adhesive for a tennis ball.

An object of the present disclosure is to provide a golf ball having an increased spin rate when being hit with an 8-iron while suppressing rise in a spin rate when being hit with a driver. The present disclosure provides a golf ball comprising a spherical core having an inner core and an outer core, and a cover positioned outside the spherical core, wherein A×a is 12,200 or less and B×b is 20,400 or more, where 'a' represents an average hardness (Shore C) of a hardness (H2.5) at a point of 2.5 mm from a center of the spherical core and a hardness (H5) at a point of 5 mm from the center of the spherical core, “b” represents an average hardness (Shore C) of a hardness (H7.5) at a point of 7.5 mm from the center of the spherical core and a hardness (H9) at a point of 9 mm from the center of the spherical core, “A” represents an impulse difference (kN·μs) between a back spin impulse and a top spin impulse measured using a contact force tester under a condition corresponding to a condition when the golf ball is hit with a driver, and “B” represents an impulse difference (kN·μs) between a back spin impulse and a top spin impulse measured using a contact force tester under a condition corresponding to a condition when the golf ball is hit with an 8-iron.

Golf ball

A golf club grip having great anti-slipping performance in the material itself constituting the grip includes an outermost surface layer, wherein at least a part of the outermost surface layer is formed from a rubber composition containing (A) a base rubber and (B) a tackifier having a softening point in a range of from 5° C. to 120° C., and a portion formed from the rubber composition has a loss tangent (tanδ) (30° C., 10 Hz) and a complex elastic modulus (E*) (30° C., 10 Hz) satisfying a relationship of 0.070≤tanδ/(E*)≤0.098.

Golf club grip and golf club

[Problem] To provide a golf club grip having excellent anti-slipping performance, and feeling when the grip is wet, and further to provide a golf club grip having excellent durability and an improved head speed. [Solution] The golf club grip comprises a cylindrical portion for inserting a shaft, wherein the golf club grip has a narrow groove region comprising narrow grooves in an occupation ratio of 35% or more per 25 mmat at least a part of a surface of the cylindrical portion, and the narrow groove has a width (w) of from 0.1 mm to 0.7 mm and a depth (h) of from 0.1 mm to 1.0 mm. In addition, an interval (d) between the narrow grooves are preferably 1.5 mm or less.

An object of the present invention is to provide a golf club grip having excellent abrasion resistance and a high coefficient of friction. The present invention provides a golf club grip comprising an outermost layer, wherein at least a part of the outermost layer is formed from a rubber composition containing (A) a base rubber and (B) carbon black, (B) the carbon black has a DBP absorption amount in a range from 50 cm/100 g to 140 cm/100 g and a CTAB specific surface area in a range from 30 m/g to 160 m/g, a product (amount&#xd7;DBP absorption amount) obtained by multiplying an amount (g) of (B) the carbon black in the rubber composition with respect to 100 g of (A) the base rubber by the DBP absorption amount (cm/100 g) ranges from 380 to 2600, a product (amount&#xd7;CTAB specific surface area) obtained by multiplying the amount (g) of (B) the carbon black in the rubber composition with respect to 100 g of (A) the base rubber by the CTAB specific surface area (m/g) ranges from 425 to 3000, and the part formed from the rubber composition has tan &#x3b4;(30&#xb0; C., 10 Hz) in a range from 0.100 to 0.280.

An object of the present invention is to provide a golf club grip having good anti-slipping performance at hitting and improved head speed. The present invention provides a golf club grip comprising a cylindrical portion for inserting a shaft, wherein the cylindrical portion is formed from a rubber composition containing a base rubber and a crosslinking agent, the base rubber contains a nonpolar rubber in an amount of 50 mass % or more, and the cylindrical portion has a surface on which a plurality of minute projections having a height (h) of 0.07 mm or more and a minimum width (w1) at the bottom in a range from 0.2 mm to 0.8 mm are formed.

An object of the present invention is to provide a golf club grip comprising a grip end with improved abrasion resistance and a reduced weight. The present invention provides a golf club grip comprising a cylindrical grip body and a grip end attached to a bat-side end of the cylindrical grip body, wherein the grip end comprises a base polymer and a hollow glass filler.

An object of the present invention is to provide a grip for sporting goods containing an acrylonitrile-butadiene based rubber as a base rubber and having an excellent grip performance and sustainability of grip performance under a wet condition. The present invention provides a grip for sporting goods comprising an outermost surface layer formed from a surface layer rubber composition, wherein the surface layer rubber composition contains (A) a base rubber and (B) a resin having a softening point in a range from 5&#xb0; C. to 120&#xb0; C., (A) the base rubber contains an acrylonitrile-butadiene based rubber, and (B) the resin is at least one type selected from the group consisting of a hydrogenated rosin ester, a disproportionated rosin ester, an ethylene-vinyl acetate copolymer, a coumarone resin, a phenol resin, a xylene resin and a styrene resin.

Grip for sporting goods and golf club

An object of the present invention is to provide a golf club grip having excellent grip performance under a wet condition. The present invention provides a golf club grip having an outermost surface layer, wherein the outermost surface layer contains (A) a crosslinked rubber and (B) a silica, and has, at at least a part thereof, a region where a spherical silica secondary particle with a particle size of 3 &#x3bc;m or more exists in an amount of at least two particles/mm. If a spherical silica secondary particle with a particle size of 3 &#x3bc;m or more exists in a given amount at at least a part of the outermost surface layer, the golf club grip has an improved grip performance under a wet condition.

An object of the present invention is to provide a golf club grip having excellent adhesion between the grip body and the grip end thereof, and excellent durability. The present invention provides a golf club grip comprising a cylindrical grip body having a cylindrical inner layer and a cylindrical outer layer covering the cylindrical inner layer, and a grip end provided on an butt side end of the cylindrical grip body, wherein the cylindrical outer layer is interposed in at least a part of a space between a butt side end edge of the cylindrical inner layer and the grip end.

Golf club grip, golf club and method for producing golf club grip

An object of the present invention is to provide a golf club grip showing a good feeling both at hitting and at waggling. The present invention provides a golf club grip comprising a cylindrical portion for inserting a shaft, wherein the cylindrical portion has a compression strain in a range from 46% to 55% at a compression stress of 20 kg/cm, and a compression strain in a range from 63% to 69% at a compression stress of 120 kg/cm.

An object of the present invention is to provide a golf ball showing a great flight distance on driver shots. The present invention provides a golf ball comprising a spherical core and at least one cover layer covering the spherical core, wherein when JIS-C hardness of the spherical core is measured at points located at distances of 0% (core center), 37.5%, 75.0% and 100% (core surface) from the core center of the spherical core, a hardness difference (Hs&#x2212;Ho) between a surface hardness (Hs) thereof and a center hardness (Ho) thereof is 20 or more, a ratio ((H&#x2212;Ho)/(H&#x2212;Ho)) of a hardness difference (H&#x2212;Ho) to a hardness difference (H&#x2212;Ho) is 0.6 or less, and a compression deformation amount (D (mm)) of the spherical core and the 37.5% point hardness (H) satisfy a relation of H&#x2266;&#x2212;9&#xd7;D+95.

An object of the present invention is to provide a golf club grip excellent in grip performance in a wet condition. The present invention provides a golf club grip formed from a rubber composition comprising a base rubber and a crosslinking agent, wherein the base rubber comprises a hydrogenated acrylonitrile-butadiene rubber and/or a carboxyl-modified acrylonitrile-butadiene rubber.

An object of the present invention is to provide a grip for sporting goods excellent in tensile strength and having a light weight. The present invention provides a grip for sporting goods comprising a cylindrical portion composed of a cylindrical inner layer and a cylindrical outer layer covering the cylindrical inner layer, wherein the cylindrical inner layer is a porous rubber layer or a porous resin layer, and the cylindrical outer layer is formed from a rubber composition containing an acrylonitrile-butadiene based rubber.

Growing community of inventors

Kobe, Japan

Sho Goji