PURPOSE: To obtain a resin compsn. for a toner maintaining a sufficiently wide anti-offsetting temp. region, fixable at a low temp. and excellent in fixing strength by incorporating a styrene-(meth)acrylic ester copolymer resin, thermoplastic polyester urethane having a specified wt. average mol. wt. and vegetable wax having a specified m.p.
CONSTITUTION: A styrene-(meth)acrylic ester copolymer is subjected to soln. polymn. in the presence of thermoplastic polyester urethane having a wt. average mol. wt. of ≥5,000 and vegetable wax having 65-90°C m.p. to obtain the objective resin compsn. for a toner. The dispersibility of the polyester urethane and the vegetable wax to the resulting styrene-(meth)acrylic ester copolymer resin is improved and image characteristics are improved. The bonding of isocyanato groups in the polyester urethane to alcohol in the wax is accelerated and the electrostatic chargeability of the objective toner using this resin compsn. is stabilized.
HORIIKE MITSUAKI
FURUKAWA TOSHIHARU
SEKISUI CHEMICAL CO LTD
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