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US 5,292,609 AGranted
Electrophotographic developer having different polyolefin waxes
AssigneeKabushiki Kaisha Toshiba
InventorsYuzaburo Yoshikawa, Toshiaki Yamauchi, Toshiyuki Oba, Akira Takano
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Abstract
The developing agent comprises a colorant and vinyl-based polymer synthetic resin to which polyolefin waxes having softening points different from each other are added. Due to this softening point difference, the solidification time period for the waxes after fixation is prolonged; therefore the developing agent attains good fixation and anti-offset properties without deteriorating the preservation property and the fluidity of the developing agent.
Claims6
A developing agent comprising:
- a first polyolefin wax having a first softening point in the range between 102.degree.-170.degree. C.;
- and
- a second polyolefin wax having a second softening point lower than the first softening point by 2.degree.-20.degree. C. and in the range between 100.degree.-168.degree. C.;
- a vinyl-based polymer synthetic resin mixed with the first polyolefin wax and the second polyolefin wax;
- wherein said first polyolefin wa is blended into the polymer synthetic resin during polymerization thereof, and the second polyolefin wax is blended thereinto during molten-kneading, wherein the content of each of said first and second waxes is 0.5 to 10 parts by weight with respect to 100 parts by weight of said vinyl-based polymer.
2 more elements
Dependencies are inferred from the claim text.