Kao Corporation

Koji Nishibuchi

Shingo Tanaka

Tetsuya Ueno

Koji Shimokusa

An electrophotographic developer composition for flash fusing containing at least a binder resin based on a polyester resin and a colorant, the polyester resin being formed between an acid component, not less than 80 mol % of the acid component being phthalic acid series dicarboxylic acid and an alcohol component, not less than 80 mol % of the alcohol component being bisphenol A alkylene oxide adduct, the polyester resin having an acid value of not more than 10.0 KOH mg/g, a softening temperature of not less than 95.0.degree. C. and not more than 125.0.degree. C. as determined using a flow tester of the 'koka-shiki' type and a glass transition temperature of not less than 50.0.degree. C. and not more than 80.0.degree. C. as determined by DSC, whereby substantially no odor is produced upon flash fusing.

Developer composition for electrophotography for flash fusing

The present invention is directed to a developer composition for electrophotography containing a binder resin comprising at least a polyester resin as the main component, a colorant and a bisphenol A alkylene oxide adduct, wherein said bisphenol A alkylene oxide adduct is contained in a ratio of not less than 1.0 part by weight and not more than 10.0 parts by weight to 100 parts by weight of the binder resin. The developer composition of the present invention possesses satisfactory low-temperature fixability and is excellent in offset resistance, storage stability and resin pulverizability.

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Wakayama, Japan

Koji Nishibuchi