Sumitomo Rubber Industries Limited

Masakazu Tanaka

Takayuki Hattori

Yoshihisa Mizumoto

Katsumi Terakawa

Hideyuki Okuyama

Jun Ochi

Kenichi Uesaka

Takashi Marui

Kenichi Kuroda

Akihiko Kawatani

Shunichi Yabushita

Noriaki Hitomi

Tetsuya Kojimoto

Yogun Ki

A developing roller is provided, which is particularly used in an image forming apparatus of a highly durable design and is free from toner leakage even after formation of a predetermined number of images. Opposite end regions () of an outer peripheral surface () of a roller body () of the developing roller () to be respectively kept in sliding contact with seal members each have a friction coefficient &#x3bc; of not greater than 0.15.

Developing roller for electrophotographic image forming

The present invention provides a conductive roller whose outermost layer is made of a vulcanized rubber composition. The vulcanized rubber composition contains epichlorohydrin rubber and chloroprene rubber as a rubber component thereof and 0.2 to 5 parts by mass of each of a thiourea-based vulcanizing agent and a vulcanization retarder consisting of N-(cyclohexylthio)phthalimide for 100 parts by mass of the rubber component.

Conductive roller which is mounted on an image-forming mechanism of an electrophotographic apparatus

A method of producing a conductive belt composed of a base resin containing polybutylene naphthalate resin at not less than 50 mass % nor more than 100 mass % and 1 to 3 mass % of carbon nano-fibers having a DBP oil absorption amount at not less than 150 ml/100 g. The method includes the steps of forming a conductive master batch by mixing the carbon nano-fibers with resin for use in a master batch containing the polybutylene naphthalate resin; mixing the obtained conductive master batch and resin for blending use containing the polybutylene naphthalate resin and not containing the carbon nano-fibers with each other in an unmelted state by setting a mixing mass ratio of the conductive master batch smaller than that of the resin for blending use; and meltingly molding an obtained mixture by an extrusion molder.

Conductive belt, method of producing same, and image-forming apparatus having same

A laminated seamless belt having at least a base layer and an outer layer. The base layer contains a polyester thermoplastic elastomer as its main component. The base layer has a volume resistivity set to not less than 1.0&#xd7;10(&#x3a9;&#xb7;cm) nor more than 1.0&#xd7;10(&#x3a9;&#xb7;cm). A volume resistivity of the outer layer is set to not less than 1.0&#xd7;10(&#x3a9;&#xb7;cm) and not less than 10 times as large as that of the base layer. The base layer and the outer layer are formed by laminated extrusion.

Method of manufacturing laminated seamless belt and laminated seamless belt

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

A flame-retardant seamless belt is formed by molding a thermoplastic composition containing a polyester thermoplastic elastomer as a main component thereof; at not less than 15 wt % nor more than 40 wt % of melamine cyanurate for a whole weight of the thermoplastic composition; and not less than 0.01 parts by weight nor more than three parts by weight of an anion-containing salt, shown by a chemical formula 1, for 100 parts by weight of an entire polymer component. The thermoplastic composition has a volume resistivity of not less than 1.0&#xd7;10&#x3a9;&#xb7;cm nor more than 1.0&#xd7;10&#x3a9;&#xb7;cm. The flame-retardant seamless belt is used as an intermediate transfer belt () or the like for use in an image-forming apparatus such as a copying apparatus, a facsimile, a printer, and the like.

Flame-retardant seamless belt, method of manufacturing flame-retardant seamless belt, and image-forming apparatus having flame-retardant seamless belt

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.

Conductive belt

The present invention provides pavement and a paving material in which a large quantity of aggregates are bound with one another by a hot melt of thermoplastic resin powder, and also provides producing methods of such pavement and such paving material. The thermoplastic resin powder is neither limited in pot life, nor influenced by working conditions and weather conditions at the time when pavement is laid at a job site. Accordingly, uniform strength can be given to the resulting pavement or paving material. Further, the resulting pavement or paving material is excellent in weather resistance, elasticity and flexibility. Thus, the pavement of the present invention can be suitably used as pavement at play ground, parks, roads and the like. It is also easy to amend pavement, as necessary, after laid. The pavement producing method of the present invention can readily and efficiently produce the pavement.

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Hyogo, Japan

Masakazu Tanaka