G - Physics – 03 – G
Patent
G - Physics
03
G
96/52
G03G 9/10 (2006.01) G03G 9/087 (2006.01)
Patent
CA 1131489
ABSTRACT A heat fixable toner powder for developing latent electrostatic images which powder comprises finely divided toner particles comprising color- ing constituents, a thermoplastic material, and, if desired a charge regulator said thermoplastic material substantially comprising epoxy resin whose original epoxy groups are blocked partly by chemical reaction with a monofunctional organic compound and partly by linking or bonding, characterised in that the epoxy resin has an epoxy molar mass between approximately 2,000 and at most 10,000 and comprises a first modified epoxy resin obtained by blocking the epoxy groups of at least one first epoxy resin starting material with a molar mass of a maximum of approximately 1,000 and with an epoxy molar mass of a maximum of approximately 700 in a proportion of approximately 25-95% by chemical reaction with a monofunctional carboxylic acid, phenol or diaryl sulphonamide and in a proportion of approximately 5-75% by linking and/or bonding by means of intermolecular reaction with the hydroxyl groups of said first epoxy resin starting material and/or by means of an epoxy hardener, or a mixture of at least 20 parts by weight of said first modified epoxy resin with a maximum of 80 parts by weight of a phenoxy resin and/or a second modified epoxy resin obtained by an at least 5% blocking of the epoxy groups of at least one second epoxy resin starting material with a molar mass of at least approximately 1,500 and an epoxy molar mass of at least approximately 900 by linking and/or bonding by means of intermolecular reaction or an epoxy hardener. The toner powder is particularly suitable for use in a high volume copying apparatus with a contact fixing device and can be excellently fixed at an extremely low temperature in a few hundredths of a second.
333512
Oce-Van Der Grinten N.v.
Smart & Biggar
LandOfFree
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