Kao Corporation

Tetuhiro Semura

Kuniyasu Kawabe

Eizi Morimoto

A developer composition for electrophotography comprising a binding resin and a colorant, said binding resin comprising a specified nonlinear first polyester and a specified linear second polyester, the weight ratio of the first polyester to the second polyester being (80:20) to (20:80), is disclosed. The developer composition of the present invention is excellent in hot offset resistance, low temperature fixation, smoothness and transparency of fixed face, and blocking resistance.

Developer composition for electrophotography

A developer composition for electrophotography comprising a binding resin and a colorant, said binding resin comprising a first linear polyester having a softening point, Tsp, in the range of from 105.degree. C. to 170.degree. C. exclusive, and a second linear polyester having a softening point, Tsp, in the range of from 80.degree. C. to 105.degree. C. exclusive and lower than that of the first linear polyester by at least 10.degree. C., the weight ratio of the first linear polyester to the second linear polyester being (80:20) to (20:80) is disclosed. The developer composition of the present invention is excellent in the hot offset resistance, low temperature fixation, smoothness of fixed face, blocking resistance and transparency.

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Wakayama, Japan

Tetuhiro Semura