Sumitomo Rubber Industries Limited

Kyushu University

Sumitomo Electric Industries, Limited

Sanko Chemical Industry Co., Ltd.

Sri Sports Limited

Tetsuo Mizoguchi

Takayuki Hattori

Toshiaki Sakaki

Yoshihisa Mizumoto

Hideyuki Okuyama

Kenichi Uesaka

Katsumi Terakawa

Yasuhisa Minagawa

Yoshiharu Tatsukami

Atsushi Takahara

Hiromasa Okubo

Yasuhiko Kondo

Noriaki Fujihana

Motoyasu Kobayashi

Kiyoshige Muraoka

Takahiro Mabuchi

Noriko Yagi

Yumi Kanemitsu

Kazuo Kadomaru

Noboru Uenishi

Shunichi Yabushita

Yasuchika Ito

Hitoshi Takii

Toshihiko Takiguchi

Shinji Kikuhara

Tetsuo Nishikawa

Kazuo Haruta

Toshinori Sakamaki

Hitoshi 1-3 1-Chome Shimaya Takii

Toshihiko 1-3 1-Chome Shimaya Takiguchi

Provided are: surface modification method for imparting slidability to surface of elastic body such as vulcanized rubber or thermoplastic elastomer without using expensive self-lubricating resin; surface-modified elastic body with polymer brush formed on its surface; and gasket for injector and injector formed of surface-modified elastic body. The surface modification method applies to surface of thermoplastic elastomer or vulcanized rubber. The surface modification method comprises the step of forming hydroxyl group on surface of to-be-modified object such as rubber so that water contact angle of the surface becomes 8 to 50 degrees smaller than original water contact angle in unmodified condition, the step of forming polymerization initiation site by subjecting the hydroxyl group to action of secondary or tertiary organic halide, and the step of growing polymer brush on the surface of to-be-modified object by subjecting monomer to radical polymerization at the polymerization initiation site acting as a point of initiation.

Surface modification method, surface-modified elastic body, gasket for injector, injector, and 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 polymer composition for a conductive roller composed of a rubber component whose main component is an epichlorohydrin rubber containing ethylene oxide at not less than 55 mol % nor more than 95 mol %. Thioureas are added to 100 g of the rubber component as a crosslinking agent at a rate not less than 0.014 mol nor more than 0.080 mol. In a compression set test of a vulcanized rubber described in JIS K6262, a compression set measured at 70&#xb0; C. for 22-24 hours is less than 15%; and in a volume resistivity value test described in JIS K6911, a volume resistivity value measured at an applied voltage of 1000V is less than 10[&#x3a9;&#xb7;cm].

Conductive roller composition of chloroprene rubber, epichlorohydrin-ethylene oxide copolymer and thiourea

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 thermoplastic resin composition having a high specific gravity, flexibility and excellent processability that can be used as a material for forming various articles requiring both massiveness and flexibility. This thermoplastic resin composition contains 2.5 to 15 wt % of a styrene-based thermoplastic elastomer and 85 to 97.5 wt % of tungsten powder, and an molded article is obtained by melting and kneading this thermoplastic resin composition. This article can be used preferably as a balance weight attached to a wheel of an automobile, sports goods or the like.

Thermoplastic resin composition

A conductive roller or a conductive belt is composed of a conductive elastomer composition including a polymer composition having a plurality of carbon-to-carbon double bonds and containing not less than 40 mol % of ethylene oxide; an organometallic salt containing a fluoro group or/and a sulfonyl group; and an elastomer having a plurality of carbon-to-carbon double bonds.

Conductive elastomer composition, conductive roller, and conductive belt

A conductive elastomer composition includes an ionic-conductive elastomer component, which contains an anion-containing salt having a fluoro group (F&#x2014;) and a sulfonyl group (&#x2014;SO&#x2014;). The conductive elastomer composition has a volume charge not more than 10(&#x3a9;&#xb7;cm) when the volume charge is measured at a voltage of 100V applied theretoin accordance with the method specified in JIS K6911. The conductive elastomer composition has a compression set not more than 30% when the compression set is measured at a temperature of 70&#xb0; C. for 24 hours at a compressibility ratio of 25% in accordance with 'the permanent set testing methods for rubber, vulcanized or thermoplastic' specified in JIS K6262.

Conductive elastomer composition, conductive member using conductive elastomer composition, image-forming apparatus having conductive member

A conductive elastomer composition having rubber-like elasticity and flexibility and thermoplastic-resin-like moldability and realizing a high conductivity. The conductive elastomer composition includes a thermoplastic elastomer composition (A) containing a compound (A1) composed of a thermoplastic resin and/or a thermoplastic elastomer and a compound (A2), composed of a crosslinkable rubber and/or a crosslinkable thermoplastic elastomer, dispersed in the compound (A1) by dynamically crosslinking the compound (A2); and an ionic-conductive agent (B), containing a metal salt and a polyether-containing block copolymer resin, dispersed in the thermoplastic elastomer composition (A). The conductive elastomer composition may contain carbon black (C).

Conductive elastomer composition and method of producing same

A conductive elastomer composition includes an ionic-conductive elastomer component, which contains an anion-containing salt having a fluoro group (F&#x2014;) and a sulfonyl group (&#x2014;SO&#x2014;). The conductive elastomer composition has a volume charge not more than 10(&#x3a9;&#xb7;cm) when the volume charge is measured at a voltage of 100V applied thereto in accordance with the method specified in JIS K6911. The conductive elastomer composition has a compression set not more than 30% when the compression set is measured at a temperature of 70&#xb0; C. for 24 hours at a compressibility ratio of 25% in accordance with 'the permanent set testing methods for rubber, vulcanized or thermoplastic' specified in JIS K6262.

A high specific-gravity EPDM composition consisting of a mixture of EPDM containing diene at less than 4.5 wt % and ethylene at not less than 58 wt % nor more than 80 wt % and having a Mooney viscosity MLnot less than 50 nor more than 170 at 125&#xb0; C. and a powdery material, containing powder whose specific gravity is not less than 12 as a main component thereof, added to the EPDM at not less than 80 wt % nor more than 97.5 wt % of a whole amount of the high specific-gravity EPDM composition.

High-specific-gravity EPDM composition, dynamic damper made from the composition, tennis racket with the dynamic damper, and radiation-shielding material comprising the composition

A rubber roller formed by molding an elastomer composition not less than 250 &#x3bc;s nor more than 400 &#x3bc;s in a Trelaxation time (spin-spin relaxation) of a bound rubber formed between a rubber and/or a thermoplastic elastomer and a reinforcing filler. EPDM can be used as the rubber and/or the thermoplastic elastomer, carbon black as the reinforcing filler, and an organic peroxide as a crosslinking agent. The Trelaxation time (spin-spin relaxation) of the bound rubber formed between the rubber and/or thermoplastic elastomer and the reinforcing filler is more than a Trelaxation time of a bound rubber of the rubber and/or thermoplastic elastomer to which the reinforcing filler is not added by not less than 150% nor more than 300%.

Elastomer composition and rubber roller composed thereof

A paper-feeding roller ( ) formed by cylindrically molding a thermoplastic elastomer composition containing a thermoplastic resin or a thermoplastic elastomer in which a rubber or a thermoplastic elastomer that can be crosslinked is dispersed by dynamic crosslinking. A surface layer of the paper-feeding roller ( ) contains titanium oxide at not less than 1.5% nor more than 50% in a volume fraction.

Paper feeding roller

Disclosed are a polymer composition comprising (A) at least one thermoplastic elastomer selected from the group consisting of a hydrogenated styrene-isoprene-styrene block copolymer, a hydrogenated styrene-butadiene-styrene block copolymer and a styrene-ethylene-ethylene-propylene-styrene block copolymer, (B) a rubber component containing an ethylene-propylene-diene rubber, and (C) a softener, or a polymer composition further comprising (a) an olefin polymer and, if necessary, (D) carbon black, wherein the amount of the component (C) is not less than 200 parts by weight based on 100 parts by weight of the total amount of the components (A) and (B) or (A), (B)and (a), and at least portion of the rubber component (B) is crosslinked by dynamic crosslinking, and a sealant made by using the same.

Growing community of inventors

Hyogo, Japan

Tetsuo Mizoguchi