| 摘要 |
PROBLEM TO BE SOLVED: To decrease the frictional coefft. of an urethane resin without increasing hardness or crystallinity, to prevent deposition of a toner and to obtain stable electrification property of a toner for a long time by incorporating a specified proportion of silicon grafted acryl polymer into a thermoplastic polyurethane resin. SOLUTION: This roll consists of a core body 1, an innermost layer 2 around the core body 1, an intermediate layer 3 formed on the layer 2, and an outermost layer 4 formed around the layer 3. The outermost layer 4 consists of a resin compsn. containing (A) a thermoplastic polyurethane resin and (B) a polymer produced by grafting side chains essentially comprising dimethylsiloxane to acryl resin main chains. The component (B) is compounded by 0.1 to 30 pts.wt. to 100 pts.wt. of the component (A) in this resin compsn. The mol.wt. of the component (B) is controlled to 1×10<3> to 1×10<6> . |
