Fujitsu Corporation

Harima Chemicals, Incorporated

Hiroichi Ishihara

Yoshimichi Katagiri

Jun Saito

Yuzo Horikoshi

Yoshihiro Makuta

Makoto Koshi

Hiroaki Naito

Yasuharu Takeuchi

Hitoshi Kusaba

Yoshiaki Ishibashi

A toner binder comprising a crosslinked polyester resin obtained by using 0.1 to 3 mol % of trimellitic acid and 0.1 to 5 mol % of an epi-bis type epoxy in combination as crosslinking components, said binder having a number average molecular weight (Mn) in the chromatogram determined by a gel permeation chromatography on the non-gel portion of the polyester resin, of 2,000 to 4,000, a ratio (Mw/Mn) of the weight average molecular weight to the number average molecular weight of 10 to 25 and a (percent gel) of the residue unsoluble in tetrahydrofuran solvent of 1 wt % or less. A toner composition for flash fixing comprising the above-described binder as an essential constituent component. The toner and the toner binder exhibit good fixability and void resistance upon flash fixing and produce little fixing odor.

Toner binder for flash fixing, toner, electrostatic photographic

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Kobe, Japan

Hiroichi Ishihara