CLEANING BLADE FOR ELECTROPHOTOGRAPHIC DEVICE

摘要

PROBLEM TO BE SOLVED: To obtain cleanability stable over a long period in a wide range of temp. region by specifying the components of polyol and isocyanate constitut ing a polyurethane elastic material and bringing the elastic material into reac tion and curing by a specific method. SOLUTION: The polyol constituting the polyurethane elastic material is polyethylene butyrene azipate or/and polyethylene azipate and polybutyrene azipate. The average mol% of the butyrene glycol in the glycol constituting the polyol is >=30 to 80mol%. the isocyanate constituting the polyurethane elastic material is 4,4'-dipnenyl methane diisocyanate. The elastic material is cured by the reaction in the presence of diazo-cycloamine salt. If the ethylene azipate and the butyrene azipate are formed as a copolymer, the respective polyols mingle with each other in spite of mixing. The polyurethane elastic material is cured by the reaction in the presence of the diazo-cycloamine salt in order to form the polyurethane elastic material into the diversified phase structures.