The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 28, 1995
Filed:
Jun. 02, 1993
Shunichi Yabushita, Akashi, JP;
Hitoshi Itani, Kobe, JP;
Sumitomo Rubber Industries, Ltd., Kobe, JP;
Abstract
The invention provides an electrically conductive rubber material for use in an electrophotographic copying apparatus of a composition which will prevent bleeding and blooming so as to obtain a image of high quality. The electrically conductive rubber material comprises a diene type rubber and a rubber which contains no double bond in its principal chain, which rubber is cross-linked with a metallic salt cross-linking agent. A portion of the diene type rubber butadiene rubber in a proportion to the total parts by weight of rubber of 10-30 parts by weight. The proportion of the rubber containing no double bond in its principal chain to the total parts by weight of rubber is not less than 15 parts by weights. 5-100 parts by weight of carbon black per 100 parts by weight of rubber are added to serve as an electrical conductivity imparting agent. Not more than 3 parts by weight of oil ingredient, use as a softening agent, plasticizer and the like, per 100 parts by weight of rubber as measured by solvent extraction by acetone is also permitted. Preferably, the rubber containing no double bond in its principal chain is EPDM rubber.