| 摘要 |
Disclosed is a polyurethane blade having an edge portion and a backup portion that have different compositions from each other. The polyurethane that forms the edge portion has higher hardness than the polyurethane that forms the backup portion. The polyurethane that forms the backup portion has a JIS-A hardness of 65-80, while the polyurethane that forms the edge portion has (1) a JIS-A hardness of 75-100 and a tan d peak temperature of from -20°C to -1°C or (2) a JIS-A hardness of 85-100 and a tan d peak temperature of from -20°C to 60°C. The blade does not suffer from blade inversion or blade squealing even in cases where the hardness of a coating film of an image carrier or the printing speed is increased. |
