| 摘要 |
PROBLEM TO BE SOLVED: To provide a feed paper separating member superior in abrasion resistance, capable of easily adjusting a friction coefficient, and casing no falling-off by excellently dispersing blended resin powder. SOLUTION: This feed paper separating member is composed of a polyurethane member molded by hardening a polyurethane blending material including long chain polyol, polyisocyanate, short chain diol and triol. The polyurethane blending material is regulated so that a valueα(total number of OH group in the polyurethane blending material/total number of NCO group in the polyurethane blending material) is set to 0.90 to 0.98, and a value K (nomber of NCO group in the polyurethane blending material/number of OH group of the long chain polyol) is set to 2.8 to 3.8, and the three-functional group ratio (number of OH group of the triol/(number of OH group of the short chain diol + number of OH group of the triol)) is set in a range of 0.3 to 0.7. The triol is set to 800 to 4,500 of molecular weight, and the resin powder having a softening point of 140°C or more, having the particle size of 20 to 200μm and having a functional group on a surface, is blended in the polyurethane member. COPYRIGHT: (C)2007,JPO&INPIT
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