G - Physics – 03 – G
Patent
G - Physics
03
G
96/53
G03G 9/08 (2006.01) C08G 59/14 (2006.01) C08G 59/16 (2006.01) G03G 9/087 (2006.01) G03G 9/097 (2006.01)
Patent
CA 1115582
ABSTRACT OF THE DISCLOSURE Positively chargeable toner powder comprising finely divided, coloured toner particles containing an insulating thermoplastic resin, colouring materials and a polarity control agent, the thermoplastic resin including at least 50% by weight of an epoxy resin having an epoxy molar mass of at least 10,000, said epoxy molar mass being achieved by modification of at least 5% of its epoxy groups with a monofunctional carboxylic acid and/or a monofunctional phenol which carry, except for the carboxyl or hydroxyl group respectively, no substituents which are reactive towards the epoxy groups of the epoxy resin, under the conditions of preparing the toner powder, and by modification of no more than 95% by intermolecular reaction or by cross-linking with the aid of a poly- functional epoxy hardener. The toner powder gives improved uniform chargeability, charge stability and permanence, reproducibility of the fusing properties, thermal stability and sensitivity to moisture.
277802
Oce-Van Der Grinten N.v.
Smart & Biggar
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