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US 5,510,887 AGranted
Cleaning blade, process cartridge containing same and electrophotographic apparatus using same
AssigneeCanon Kabushiki Kaisha
InventorsMasahiro Watabe, Toshinari Miura
Life of this patent
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Abstract
A cleaning blade is formed of a polyurethane elastomer obtained by using a hardener composition including at least trimethylolpropane. The polyurethane elastomer has the properties of (1) a trimethylolpropane concentration of at least 0.10 mM/g; (2) a urethane group concentration of at least 2.20 mM/g; and (3) a tan.delta. having a maximum value at a temperature of at most 12.degree. C.
Claims19
A cleaning blade, comprising:
- a polyurethane elastomer obtained by using a hardener composition comprising at least trimethylolpropane, wherein said polyurethane elastomer has the following properties (1) to (3):
- (1) a trimethylolpropane concentration of at least 0.10 mM/g;
- (2) a urethane group concentration of at least 2.20 mM/g;
- and
- (3) a tan.delta. having a maximum value at a temperature of at most 12.degree. C.
2 more elements
A process cartridge, comprising:
- a cleaning blade, comprising a polyurethane elastomer obtained by using a hardener composition comprising at least trimethylolpropane, wherein said polyurethane elastomer has the following properties (1) to (3):
- (1) a trimethylolpropane concentration of at least 0.10 mM/g;
- (2) a urethane group concentration of at least 2.20 mM/g:
- and
- (3) a tan.delta. having a maximum value at a temperature of at most 12.degree. C.;
- and an electrophotographic photosensitive member integrally supported to form a single cartridge which can be connected to or released from an apparatus body of an image-forming apparatus as desired.
3 more elements
An electrophotographic apparatus comprising:
- an electrophotographic photosensitive member;
- means for forming an electrostatic latent image;
- means for developing the formed electrostatic latent image;
- means for transferring the developed image to a transfer-receiving material;
- and
- a cleaning blade comprising a polyurethane elastomer obtained by using a hardener composition comprising at least trimethylolpropane, wherein said polyurethane elastomer has the following properties (1) to (3):
- (1) a trimethylolpropane concentration of at least 0.10 mM/g;
- and
- (2) a urethane group concentration of at least 2.20 mM/g;
- and
- (3) a tan.delta. having a maximum value at a temperature of at most 12.degree. C.
8 more elements
Dependencies are inferred from the claim text.