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AssigneeBridgestone Corporation
InventorsChikara Yamada, Toshiyuki Osaki, Tadashi Nakajima, Takahiro Kawagoe
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An ethylene propylene rubber foam which comprises as the crude rubber, an ethylene propylene rubber having an iodine value of 35 to 45 and a Mooney viscosity ML1+4 at 100° C. of 20 to 50, and which has less compression set and is suitable as a material for a transfer member, a primary transfer member, a secondary transfer member, a cleaning member for image formation bodies, a bias member, a backup member, etc.; an electroconductive ethylene propylene rubber foam which comprises as the crude rubber, an ethylene propylene rubber having an iodine value of 35 to 45 and a Mooney viscosity ML1+4 at 100° C. of 20 to 50, and which electrifies an image formation body through direct charge injection by applying voltage, thus enabling to electrify at low voltage, substantially prevent ozone generation, noises and defective image; an electrifying member comprising the above electroconductive rubber foam; electrifying equipment equipped with the above member; and image formation equipment equipped with the above member or the above equipment.
An ethylene propylene rubber foam which comprises as the crude rubber, an ethylene propylene rubber having an iodine value in the range of 35 to 45 and a Mooney viscosity ML1+4 at 100° C. in the range of 20 to 50.
The ethylene propylene rubber foam according to claim 1, wherein said rubber foam is composed of a rubber composition which comprises 100 parts by weight of the ethylene propylene rubber as set forth in claim 1, 0.5 to 5 parts by weight of a (A) vulcanizing agent, 1 to 15 parts by weight of a (B) foaming agent, 10 to 80 parts by weight of a (C) process oil and 10 to 60 parts by weight of a (D) filer.
An electrifying member which electrifies an image formation body through direct charge injection by bringing said member into contact with said body, and applying voltage therebetween, and which comprises an electroconductive ethylene propylene rubber foam, said rubber foam comprising as the crude rubber, an ethylene propylene rubber having an iodine value in the range of 35 to 45 and a Mooney viscosity ML1+4 at 100° C. in the range of 20 to 50.
The electrifying member according to claim 11, wherein the electroconductive ethylene propylene rubber foam is composed of a rubber composition which comprises 100 parts by weight of the ethylene propylene rubber as set forth in claim 11, 0.5 to 5 parts by weight of a (A) vulcanizing agent, 1 to 15 parts by weight of a (B) foaming agent, 10 to 80 parts by weight of a (C) process oil, 10 to 60 parts by weight of a (D) filer and 1 to 80 parts by weight of a (E) electroconductive material.
Dependencies are inferred from the claim text.