| 摘要 |
PROBLEM TO BE SOLVED: To provide a polyurethane foam-made roller which enables to form a good image when used as a toner supply roller in an electrographically image- forming device, and is also suitably applicable to other uses. SOLUTION: In a roller composed of a polyurethane foam, obtained by reaction curing of a urethane material containing an isocyanate component and a polyol component, the objective urethane foam roller is obtained from the isocyanate component consisting of trilenediisocyanate (TDI) and diphenylmethane diisocyanate (MDI) by the mass ratio of 30/70-70/30 (TDI/MDI), and the polyol component of a polyether polyol obtained by addition polymerization of ethylene oxide and propylene oxide. |
