Sumitomo Rubber Industries Limited

Dunlop Sports Company Limited

Sanko Chemical Industry Co., Ltd.

Katsumi Terakawa

Kazuyuki Nishioka

Takayuki Hattori

Kiyoshige Muraoka

Toshiaki Sakaki

Kenichi Uesaka

Tetsuo Mizoguchi

Kazuyoshi Shiga

Yoshiharu Tatsukami

Takahiro Mabuchi

Ryuichi Tokimune

Hiromasa Okubo

Masakazu Tanaka

Jun Ochi

Noriaki Fujihana

Fumio Sekido

Kiyoto Maruoka

Wako Iwamura

Naoya Ichikawa

Naohiko Kikuchi

Kazuo Hochi

Makoto Sugiya

Ryota Sakamine

Noriko Yagi

Shuichiro Ono

Shunichi Yabushita

Yogun Ki

Minoru Ueda

Gan Seng Neon

Lee Siang Yin

Toshirou Matsuo

An airless tire includes a tread ring, a hub and a spoke. The tread ring includes a tread rubber layer, a first reinforcing cord layer on radial direction inner side of the tread layer, a second reinforcing cord layer on radial direction inner side of the first cord layer, and a shear rubber layer between the cord layers, the cord layers have array layers including reinforcing cords, and topping rubber portions covering the array layers, each topping portion has an inner portion adjacent to the shear layer, and an outer portion, and the topping portion(s) has the inner portion formed of a composition including a rubber component which includes a butadiene rubber in content rate of 10 to 100% by mass, an &#x3b1;, &#x3b2;-unsaturated carboxylic acid metal salt in amount of 10 to 80 parts by weight with respect to 100 parts by mass of the component, and a peroxide.

Airless tire

An object of the present invention is to provide a golf ball excellent in shot feeling, flight distance and durability. The present invention provides a golf ball comprising a spherical core and at least one cover layer covering the spherical core, wherein the spherical core is formed from a core rubber composition containing (a) a base rubber, (b) a co-crosslinking agent, (c) a crosslinking initiator, and (x) a crosslinked rubber powder; (x) the crosslinked rubber powder contains (x1) soft particles with a hardness difference (Hs&#x2212;Hp)between a particle hardness (Hp) of the soft particles and a surface hardness (Hs) of the spherical core being 20 or more in JIS-C hardness, and a hardness difference (Hs5&#x2212;Hp) between the particle hardness (Hp) of the soft particles and a hardness (Hs5) at 5 mm point inside the surface of the spherical core being 15 or more in JIS-C hardness; and the core rubber composition contains (x1) the soft particles in an amount of 1.0 mass % or more.

Golf ball

Provided are: a rubber composition achieving balanced improvement in fuel economy, abrasion resistance, and processability, and a pneumatic tire including the composition. The rubber composition includes: a conjugated diene polymer; silica; and a silane coupling agent, the polymer being obtained by polymerizing a monomer component including a conjugated diene compound and a silicon-containing vinyl compound in the presence of a polymerization initiator of formula (I): to produce a copolymer, and reacting a compound containing nitrogen and/or silicon atoms with an active terminal of the copolymer, wherein the rubber composition contains the conjugated diene polymer in an amount of 5-45% by mass per 100% by mass of a rubber component, the silica in an amount of 5 to 100 parts by mass per 100 parts by mass of the rubber component, and the coupling agent in an amount of 2-12 parts by mass per 100 parts by mass of the silica.

Rubber composition and pneumatic tire

The present invention provides a polar group-containing copolymer which can provide a rubber composition and a winter tire achieving the abrasion resistance, performance on ice, and handling stability on dry roads in a balanced manner. The present invention relates to a polar group-containing copolymer obtainable by copolymerizing a conjugated diene compound and a polar group-containing vinyl compound, wherein the polar group-containing vinyl compound is a compound that has a polymerizable unsaturated bond and a polar group, wherein any one of carbon atoms forming the polymerizable unsaturated bond and a carbon atom linked to the polar group are connected to each other via at least one carbon atom, and wherein a cis content of the double bond portion of the conjugated diene compound in the polar group-containing copolymer is 80 mol % or more.

Polar group-containing copolymer, rubber composition and studless tire

To provide a pneumatic tire which can reduce fuel consumption without causing reduction in grip performance and after use of which can be degraded by microorganisms. The present invention relates to a rubber composition including 100 parts by mass of a rubber component including a natural rubber and/or a diene rubber and 0.5 to 80 parts by mass of a biodegradable aliphatic polyester. The biodegradable aliphatic polyester is preferably one or more species selected from polylactic acid, polycaprolactone and polyalkylene succinate.

Rubber composition and pneumatic tire using the same

A rubber composition for a tire, in which a specific tackifier is compounded, and tackiness and various physical properties are improved, compared with compounding a petroleum resin or a terpene resin, is provided. The rubber composition for a tire comprising an alkyd resin and a pneumatic tire using the same. It is preferable that a material derived from a resource other than petroleum, particularly, a material derived from animal and/or vegetable, and more particularly, a material derived from an animal oil and/or a vegetable oil is contained in the alkyd resin, and it is preferable that unsaturated polybasic acid is contained in the alkyd resin.

Rubber composition for tire and pneumatic tire using the same

The present invention provides a rubber composition capable of improving grip performance and abrasion resistance and a tire prepared by using the rubber composition. The rubber composition of the present invention comprises 0.5 to 150 parts by weight of thermoplastic polyurethane prepared from a conjugated diene polymer modified with hydroxyl groups at both ends thereof or an aromatic vinyl-conjugated diene copolymer modified with hydroxyl groups at both ends thereof based on 100 parts by weight of a rubber component comprising a diene rubber. The tire of the present invention is prepared by using the rubber composition.

Rubber composition and tire using same

A rubber composition for a tire superior in grip performance and abrasion resistance and a tire prepared by using the same are provided. The rubber composition for a tire comprises 3 to 200 parts by weight of an aromatic vinyl polymer having an end modified with &#x2014;OH, &#x2014;SH, &#x2014;COOH, &#x2014;CSSH, &#x2014;SOH, &#x2014;(COO)M, &#x2014;(SO)M or &#x2014;CO&#x2014;R (M is a cation, x is an integer of 1 to 3 depending on the valency of M and R is an alkyl group) and having a weight average molecular weight of 300 to 10,000, based on 100 parts by weight of a diene rubber, and the tire is prepared by using the rubber composition.

Rubber composition for tire and tire using the same

A rubber composition for a tire and a tire made therefrom which possesses excellent grip performance and abrasion resistance, said rubber composition containing a diene rubber and an aromatic vinyl polymer having a glass transition temperature at most 10&#xb0; C., the amount of the aromatic vinyl polymer being preferably 5 to 150 parts by weight based on 100 parts by weight of the diene rubber.

A conductive layer of a conductive member for an image-forming apparatus is composed of a conductive polymer composition containing an ionic-conductive addition salt. The conductive polymer composition has a continuous phase and one or more uncontinuous phases including at least one first uncontinuous phase. The continuous phase and the uncontinuous phase form a sea-island structure. A salt capable of dissociating into cations and anions is unevenly distributed to the first uncontinuous phase. A polymer composing the first uncontinuous phase has a higher degree of affinity for the salt capable of dissociating into cations and anions than a polymer composing the continuous phase to prevent the salt (or the cations, the anions) from shifting out of the first uncontinuous phase or out of the polymer composition. The conductive polymer composition can contain melamine cyanurate so that it is flame-retardant.

Conductive member for image-forming apparatus

The present invention provides a polymeric-type antistatic agent containing a polymer composition consisting of a polymeric-type antistatic agent containing a resin or/and an elastomer as a main component thereof; or/and a thermoplastic resin having a polar group or/and an elastomer having the polar group. At least one kind of an anion-containing salt, having a fluoro group and a sulfonyl group, is added to the polymer composition without intermediary of a medium consisting of a low-molecular-weight polyether-containing compound or a low-molecular-weight polar compound whose number-average molecular weight is not more than 5000. The present invention also provides a composition, for a conductive roller or the like, containing polymer components and the polymeric-type antistatic agent dispersed in the polymer components.

Polymeric-type electric resistance control agent and polymer composition containing the same

The present invention provides a rubber composition, in which abrasion resistance and gripping performance are improved in a balanced manner and bleeding of the components is inhibited, and a tire using the composition. Specifically, the present invention provides a rubber composition comprising (B) 10 to 200 parts by weight of a low molecular weight aromatic vinyl-conjugated diene copolymer having weight average molecular weight of 1.0&#xd7;10to 1.0&#xd7;10and aromatic vinyl content of 10 to 75% by weight, wherein the hydrogenation ratio of double bonds in the conjugated diene part is 20 to 60%, based on (A) 100 parts by weight of a rubber component containing at least 60% by weight of a styrene-butadiene copolymer having weight average molecular weight of 5.0&#xd7;10to 2.5&#xd7;10and styrene content of 20 to 60% by weight, wherein the amount of vinyl bonds in the butadiene part is 20 to 70%; which satisfies the following equation5% by weight&#x3c;&#x3c;(+10% by weight)when As (% by weight) is the styrene content of copolymer (A) and Bv (% by weight) is the aromatic vinyl content in the butadiene part of copolymer (B), and a tire using the same.

Rubber composition and tire using the same

The present invention provides a rubber composition for a tire, in which gripping performance and abrasion resistance are improved in a balanced manner, and a tire using the same. Specifically, the present invention provides a rubber composition for a tire comprising 5 to 200 parts by weight of a low molecular weight aromatic vinyl-conjugated diene copolymer having a specific aromatic vinyl content and weight average molecular weight, based on 100 parts by weight of a rubber component containing aromatic vinyl-conjugated diene copolymer, a rubber composition for a tire comprising 5 to 200 parts by weight of an olefin-conjugated diene-aromatic vinyl copolymer based on 100 parts by weight of a diene rubber component, and a tire using the same.

Rubber composition for a tire and tire using the same

A conductive belt having a base layer () electroconductive and made of a resin, an intermediate layer () ionic-conductive and made of an elastomer, and a surface coating layer (). The base layer () has a tensile modulus of elasticity of not less than 500 Mpa and a volume electric resistance value not less than 10&#x3a9;&#xb7;cm nor more than 10&#x3a9;&#xb7;cm. The intermediate layer () has a JIS A hardness less than 70, a thickness not less than 50 &#x3bc;m nor more than 600 &#x3bc;m, and a volume electric resistance value not less than 10&#x3a9;&#xb7;cm nor more than 10&#x3a9;&#xb7;cm.

Growing community of inventors

Kobe, Japan

Katsumi Terakawa