Sumitomo Rubber Industries Limited

Akihiro Mine

Toshiyuki Hirai

Toshihiro Tamura

Masashi Hamakubo

Hirokazu Nishimori

Masahiro Yoshizato

Takehiko Hyodo

Yasuchika Ito

Yudai Okuno

Yoshihiro Yamada

Hideyuki Okuyama

Hideki Otsuji

Shuichi Sakamoto

Hirofumi Konishi

Munehiro Nishimoto

Keishi Yamamoto

Yuichi Sato

Naoyuki Astoyoshi

There is provided a rubber composition in which an antistatic agent is uniformly dispersed and the rubber composition has antistatic ability, coefficient of friction, and wear resistance. A rubber composition includes 7 parts by mass or more of a polyether/polyolefin block copolymer resin with respect to 100 parts by mass of a rubber component, and the total amount or a part of a rubber component is mixed with a polyether/polyolefin block copolymer resin at a temperature that is equal to or higher than a melting point of the polyether/polyolefin block copolymer resin.

Antistatic rubber composition

A paper feed roller of the present invention comprises a roller bodyintegrally formed of elastic material in a cylindrical shape in which a plurality of protruding linesare disposed on a peripheral surfaceat even intervals, wherein the roller bodyis formed so that crest portionsand trough portionsare continuously provided in a circumferential direction, an opening angle &#x3b8; is equal to or more than 2&#xb0; and is equal to or less than 8&#xb0;, a radial height h of the protruding line is equal to or more than 0.051 mm and is equal to or less than 0.1 mm, and a curvature radius rat a shoulder is equal to or more than 0.55 mm.

Paper feed roller and image forming apparatus with the paper feed roller

There are provided: an electrically conductive thermoplastic elastomer composition which can be produced with higher productivity at lower costs by means of a simple arrangement and has excellent extrudability and a lower resistance required for a driving roller; a production method for the composition; a driving roller produced by employing the electrically conductive thermoplastic elastomer composition; and an image forming apparatus incorporating the driving roller. In the electrically conductive thermoplastic elastomer composition, 5 to 15 parts by mass of Ketjen black is finely dispersed in 100 parts by mass of a mixture of an ester type urethane thermoplastic elastomer and a plasticizer or in 100 parts by mass of a polyester thermoplastic elastomer. In the production method, the ingredient other than the Ketjen black is first kneaded, and then the Ketjen black is added to and further kneaded with the ingredient. The driving roller () is formed of the electrically conductive thermoplastic elastomer composition. The image forming apparatus incorporates the driving roller.

Electroconductive elastomer composition and manufacturing method therefor

Provided is a paper feeding roller in which recesses due to deformation are unlikely to be formed even when contact with another roller in one location continues for a comparatively long period of time, particularly as a conveying roller or the like. A paper feeding roller that has a shaft measuring 6 mm in exterior diameter pressure-welded to the outer circumferential surface under a load of 600 g in a high-temperature environment of 60&#xb0; C. for 24 hours is left at room temperature for eight hours while being pressure-welded, after which the recess amount obtained using the difference (T)&#x2212;T, between the thickness T(mm) of the position where the shaft was pressure-welded and the thickness T(mm) of a position where the shaft was not pressure-welded, is 0.1 mm or less.

Paper feeding roller

A rubber composition contains a higher ethylene content EPDM and a lower ethylene content EPDM as a rubber component. The proportion of the higher ethylene content EPDM is 30 to 80 mass % based on the overall amount of the rubber component. The rubber composition is less susceptible to reduction in friction coefficient &#x3bc; and has a proper hardness, a smaller permanent elongation and an excellent abrasion resistance after crosslinking. Therefore, the rubber composition is suitable for a sheet conveying roller and an image forming apparatus incorporating the sheet conveying roller.

Rubber composition, sheet conveying roller, and image forming apparatus

A sheet feeding member is provided, which is made of a thermoplastic elastomer composition comprising: a base polymer including a polyurethane thermoplastic elastomer and a polyester thermoplastic elastomer; and at least one ion conductive agent selected from the group consisting of a quaternary ammonium salt and a lithium salt/polyol, wherein the ion conductive agent is present in a proportion of 0.2 to 4 parts by mass based on 100 parts by mass of the base polymer in the thermoplastic elastomer composition.

Sheet feeding member

The inventive sheet conveying roller has a double-layer structure including a tubular outer layer and an inner layer inserted directly in the tubular outer layer without the intervention of an adhesive agent. The sheet conveying roller includes a roller body of a double-layer structure including a tubular outer layer () of a urethane thermoplastic elastomer and an inner layer () of a rubber such as IIR inserted directly in the tubular outer layer () without the intervention of an adhesive agent. The outer layer () has a Type-A Durometer hardness of not less than 40 and not greater than 65, and the inner layer () has a Type-A Durometer hardness of greater than 10 and not greater than 25.

Sheet conveying roller

The paper feed roller according to the present invention is made of a thermoplastic elastomer composition containing an ester thermoplastic elastomer urethane or an ether thermoplastic elastomer urethane (E) having microrubber hardness (type A) of not less than 60 and not more than 80 and a plasticizer (P) in a mass ratio E/P of 70/30 to 50/50.

Paper feed roller

The present invention provides a sheet conveying roller which requires a smaller number of ingredients than a prior art sheet conveying roller, has an excellent weather resistance, is less liable to suffer from reduction in friction coefficient attributable to accumulation of paper dust and sheet conveying failure attributable to the reduction in friction coefficient, and ensures proper sheet conveyance for a longer period of time. The invention further provides a rubber composition for the sheet conveying roller. The rubber composition comprises an ethylene-propylene-diene rubber and an epoxylated natural rubber as a rubber component. In the rubber composition, the epoxylated natural rubber is present in a proportion of 10 mass % to 90 mass % based on the overall amount of the rubber component including the two rubbers. The sheet conveying roller includes a roller body formed from the rubber composition.

Sheet conveying roller and rubber composition

The inventive sheet conveying roller includes a plurality of linear projections provided on an outer peripheral surface of a roller body of an elastic material and each having a generally right-angled triangular cross section which includes a hypotenuse edge and an adjoining edge provided on a forward side and on a rearward side, respectively, with respect to a roller body rotation direction, the adjoining edge aligning with a line perpendicular to a center axis of the roller body. The linear projections are rounded with the hypotenuse edges and the adjoining edges thereof connected to each other by curves as seen in section, and provided integrally with the roller body to be equidistantly arranged on the outer peripheral surface of the roller body.

Sheet conveying roller and image forming apparatus

A paper-feeding roller including a rubber composition containing short fibers in which the short fibers has an average fiber diameter not less than 10 &#x3bc;m nor more than 100 &#x3bc;m and an average fiber length not less than 0.01 mm nor more than 4 mm. At least one part of all of the short fibers is radially oriented at an angle not less than 10 degrees nor more than 90 degrees with respect to a plane which contacts a surface of the paper-feeding roller, with one end of each of the radially oriented short fibers disposed exposably on the surface of the paper-feeding roller.

Paper-feeding roller

The present invention provides a rubber composition, which has improved gripping performance that is required in a competition tire, high hardness and high stiffness. Specifically, the present invention provides a rubber composition comprising 10 to 100 parts by weight of carbon black having nitrogen-adsorbing specific surface area of 160 to 300 m/g, and 15 to 70 parts by weight of an oil, based on 100 parts by weight of a rubber component comprising 20 to 95% by weight of a styrene butadiene copolymer rubber having styrene content of at least 30% and vinyl content of at least 30% and 5 to 80% by weight of butadiene rubber, and silica in an amount of 20 to 100% by weight of the carbon black; wherein the total amount of the carbon black and the silica is 20 to 120 parts by weight.

Rubber composition and competition tire using the same

A member for preventing feeding of a plurality of sheets at a time including a composition containing a resin component. Not less than 10 parts by mass nor more than 100 parts by mass of a polyester thermoplastic elastomer is contained in 100 parts by mass of the resin component. The polyester thermoplastic elastomer is composed of a hard segment and a soft segment. The hard segment consists of diester groups of aromatic dicarboxylic acid. The soft segment consists of ester groups of aliphatic carboxylic acid or aliphatic polyether groups.

Growing community of inventors

Kobe, Japan

Akihiro Mine