POLYMERIC MATERIAL, ELECTROCONDUCTIVE MEMBER AND IMAGE-FORMING DEVICE

摘要

PROBLEM TO BE SOLVED: To obtain a polymeric material capable of providing an electroconductive member excellent in various characteristics without fouling an image-forming unit or a transfer material, or the like, by carrying out the chain extension and curing of a specific prepolymer with a specified polyol. SOLUTION: This polymeric material is obtained by reacting (A) a polyether polyol consisting essentially of the one having preferably 3 functional groups with (B) a polyisocyanate compound consisting essentially of preferably a diphenylmethane diisocyanate (derivative) at 10-120 deg.C for about l-150 h and then carrying out the chain extension and curing of (C) the resultant prepolymer with (D) a polyol having 500-5,000 weight-average molecular weight and terminal hydroxyl groups of primary ones (e.g. polytetramethylene ether glycol). The components A and B are preferably used in a ratio so that the amount of the component B is preferably in excess of the stoichiometric one so as to provide preferably 2-20 wt.% content of the isocyanate groups in the component C.