| 摘要 |
A cleaning blade member comprising a polyurethane formed by using a polyol consisting essentially of a polycarbonatediol, a polyisocyanate, and a crosslinking agent containing a short chain diol and a triol, the polyurethane having a tensile strength at 60° C. of 200 kg/cm<SUP>2 </SUP>or higher, and a tensile strength retention DeltaT, represented by the following equation, of 40% or more: <?in-line-formulae description="In-line Formulae" end="lead"?>DeltaT(%)=T<SUB>60</SUB>/T<SUB>10</SUB>x100 <?in-line-formulae description="In-line Formulae" end="tail"?> where T<SUB>10 </SUB>denotes a tensile strength at 10° C., and T<SUB>60 </SUB>denotes the tensile strength at 60° C.
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