| 摘要 |
PROBLEM TO BE SOLVED: To obtain a polyurethane foam layer without deteriorating the reactivity of a polyurethane material, and to provide a toner supply roller which suppresses contamination by a catalyst remaining in a polyurethane foam layer, so that a proper image is obtained, and which has adequate opening cells in a surface thereof, adequately performs scraping of toner remaining after development and toner supply between it and a developing roller, and forms a uniform toner thin film on the developing roller so that a proper image is obtained. SOLUTION: The toner supply roller has a polyurethane foam layer, formed by using a polyurethane material containing a polyol and a polyisocyanate on the outer periphery of a metallic cylinder, wherein the polyol and polyisocyanate have an amine value of 3-15 mgKOH/g as a whole. COPYRIGHT: (C)2009,JPO&INPIT |
