| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an electric conductivity roll of an electrophotographic apparatus such as a copier, a printer and a facsimile machine which excels in running stability and durability, and a polyurethane resin used therein. <P>SOLUTION: The polyurethane resin is obtained by copolymerizing a polyol (A), an organic diisocyanate (B), and a polysiloxane compound (C), and the polyurethane resin has at least two glass transition temperatures and one is in the range of -250 to -60°C and the other is in the range of -50 to 50°C. <P>COPYRIGHT: (C)2007,JPO&INPIT |
