Blade member and cleaning blade

摘要

A blade member 1 is used for removal of residual toner 5 remaining on a surface of a counterpart member 4 in an image forming device employing an electrophotographic system, by sliding contact with the counterpart member 4. The blade member 1 includes a blade body 11 made of a polyurethane rubber using diphenylmethane diisocyanate and a polyester polyol as main raw materials, and a film 12 that covers at least a surface of a sliding contact portion of the blade body 11 to contact with the counterpart member 4. The polyurethane rubber has an international rubber hardness degree of 65 to 85 IRHD, a tan δ peak temperature of 8° C. or lower, and a tan δ peak value of 1.1 or less. The film 12 contains a hydrocarbon polymer as a main component.

主权项

1. A blade member to be used for removal of residual toner remaining on a surface of a counterpart member in an image forming device employing an electrophotographic system, by sliding contact with the counterpart member, the blade member comprising:
a blade body made of a polyurethane rubber using diphenylmethane diisocyanate and a polyester polyol as main raw materials; and a film that covers at least a surface of a sliding contact portion of the blade body to contact with the counterpart member, wherein the polyurethane rubber has an international rubber hardness degree of 65 to 85 IRHD, a tan δ peak temperature of 8° C. or lower, and a tan δ peak value of 1.1 or less, the film contains a hydrocarbon polymer as a main component, and a covering portion of the blade body provided with the film has an H1/H2 ratio of 2 or less, when a Martens hardness of a surface of the covering portion under a load of 0.1 mN is designated as H1, and a Martens hardness of a surface of the covering portion under a load of 1 mN is designated as H2.