Basf Se Corporation

Yoshihisa Fujii

Hiroyasu Kanno

Torii Yoshinori

Ema Kenji

A polycarbonate of number average molecular weight from 500 to 10000, glass transition point from 30 to 80&#xb0; C. and hydroxyl group value of 30 mg KOH/g or less. The use of the polycarbonate in a urethane modified resin used as an ingredient for the production of a toner or a developer. A urethane modified resin obtained by reacting a polymer mixture containing the polycarbonate and a polycondensed resin of glass transition point from 10 to 60&#xb0; C. and hydroxyl group value from 20 to 100 mg KOH/g with a polyfunctional isocyanate compound wherein the ratio of polycarbonate to polycondensed resin is from 20:80 to 80:20 by weight and the molar ratio of isocyanate groups in the polyisocyanate compound to hydroxyl groups in the polymer mixture is from 0.4 to 1.2:1. A toner for electronic copying containing the urethane modified polycarbonate based resin. A developer containing the toner and optionally a carrier.

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London, United Kingdom

Yoshihisa Fujii