Toner for developing electrostatic image and fixing method

G - Physics – 03 – G

Patent

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G03G 9/087 (2006.01) C21D 8/08 (2006.01) C22C 38/00 (2006.01) C22C 38/14 (2006.01) G03G 9/09 (2006.01) G03G 13/20 (2006.01)

Patent

CA 2056348

A toner for developing an electrostatic image is constituted by a binder resin and a colorant The binder resin is characterized by containing at least 20 wt. % of an extraction residue after 6 hours of extraction and below 20 wt. % of an extraction residue after 72 hours of extraction respectively by Soxhlet extraction with tetrahydrofuran. The toner shows a dynamic modulus and a loss modulus, respectively at 200 °C and 0.1 Hz, which are substantially unchanging with time. The properties provide the toner with a harmonization of anti-offset characteristic and fixability as well as stable viscoelasticity under heating.

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