Patent application number | Description | Published |
20120014723 | SEMICONDUCTIVE ROLLER, TONER TRANSPORT ROLLER AND ELECTROPHOTOGRAPHIC APPARATUS - The semiconductive roller according to the present invention includes a roller body having an outer peripheral surface made of a crosslinked substance of a semiconductive rubber composition and exhibiting Shore A hardness of not more than 60, the semiconductive rubber composition contains a base polymer made of a mixture of (1) mixed rubber N of liquid nitrile rubber and solid nitrile rubber, (2) chloroprene rubber C, and (3) epichlorohydrin rubber E in a mass ratio (C+E)/N of 10/90 to 80/20, the ratios of the chloroprene rubber and the epichlorohydrin rubber in the total quantity of the base polymer are not less than 5 mass % and not less than 5 mass % respectively, and roller resistance at an applied voltage of 5 V is not less than 10 | 01-19-2012 |
20130089362 | DEVELOPING ROLLER - 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 ( | 04-11-2013 |
20140023410 | DEVELOPING ROLLER - A developing roller is provided which is capable of forming a toner layer having the most uniform possible thickness on an outer peripheral surface of a roller body thereof. The roller body ( | 01-23-2014 |
20140023411 | DEVELOPING ROLLER - A developing roller is provided which is capable of forming a toner layer having the most uniform possible thickness on an outer peripheral surface of a roller body thereof. The roller body ( | 01-23-2014 |
20140113783 | SEMICONDUCTIVE ROLLER - A semiconductive roller is provided which includes a roller body formed from a highly extrudable rubber composition containing an SBR and an epichlorohydrin rubber in combination as a rubber component, the roller body having a higher production yield and higher toner imaging durability, and unlikely to suffer from reduction in image density due to adhesion of toner and a contact mark on an outer peripheral surface thereof with a smaller compression set. In the rubber component, the SBR and the epichlorohydrin rubber are present in an SBR excess state. In the rubber composition, a crosslinking component for crosslinking the rubber component includes a sulfur crosslinking agent and 0.75 to 3 parts by mass of a thiazole accelerating agent based on 100 parts by mass of the rubber component. The roller body (2) of the semiconductive roller (1) is made of a crosslinking product of the rubber composition. | 04-24-2014 |
20150234313 | SEMICONDUCTIVE ROLLER - A semiconductive roller according to the present invention includes a crosslinked product containing just the three types of rubber of butadiene rubber, epichlorohydrin rubber, and chloroprene rubber as rubber components, has a non-porous, single-layer structure, and has a compression set Cs (%) of not more than 10% as measured in accordance with the measurement method described in the Japanese Industrial Standards JIS K6262:2006 under conditions of a test temperature of 70° C., a test time of 24 hours, and a compression ratio of 25%. | 08-20-2015 |
20150234314 | SEMICONDUCTIVE ROLLER - A semiconductive roller of the present invention includes a crosslinked product of a rubber composition containing just the two types of rubber of butadiene rubber and epichlorohydrin rubber as rubber components. | 08-20-2015 |