Toner composition for use in electrophotography comprising novel polyester binder resin

• Main Authors: SAKAGUCHI; KAHEI, TAKEMOTO; HIROTAKA
• Format: Patent
• Language: English
• Published: 26.10.1976
• Subjects: CHEMISTRY; CINEMATOGRAPHY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; ELECTROGRAPHY; ELECTROPHOTOGRAPHY; HOLOGRAPHY; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; MAGNETOGRAPHY; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PHOTOGRAPHY; PHYSICS; THEIR PREPARATION OR CHEMICAL WORKING-UP

A toner composition capable of being charged with a positive electrical charge and adapted for use in electrophotography which comprises 1 to 20 parts by weight of a colorant and 80 to 99 parts by weight of a resin, characterized in that said resin consists essentially of A. FROM 55 TO 100% BY WEIGHT OF A POLYESTER RESIN WHICH HAS A SOFTENING POINT OF 80 DEG TO 130 DEG C. measured in accordance with ASTM-E28-51T (ring and ball method), which has a nitrogen content of from 0.2 to 2.5%, based on the weight thereof, and which is obtained by the reaction of; 1. A DICARBOXYLIC ACID COMPONENT CONTAINING 50 MOL % OR MORE OF A DICARBOXYLIC ACID, OR AN ANHYDRIDE THEREOF, SELECTED FROM THE GROUP CONSISTING OF FUMARIC ACID, MALEIC ACID AND SUCCINIC ACID; WITH 2. A POLYOL COMPONENT CONTAINING 10 MOL% OR MORE OF A GLYCOL CONTAINING AN AMINO GROUP AND HAVING THE FORMULA R4R5R2R3R1R2R3R4R5 ANGLE ANGLE ¦ ANGLE ANGLE H--O-C---C---N--- C--- C-O--H mn WHEREIN R1 is hydrogen, alkyl having from 1 to 20 carbon atoms, phenyl, naphthyl, or cyclohexyl, wherein R2, R3, R4 and R5, which can be the same or different, each is hydrogen or methyl, and wherein m and n are integers and the sum of m plus n is from 2 to 20; and B. THE BALANCE OF SAID RESIN, I.E. FROM 0 TO 45% BY WEIGHT OF SAID RESIN IS A RESIN WHICH HAS A SOFTENING POINT OF 80 TO 150 DEG C. and is selected from the group consisting of polystyrene, rosin maleate, petroleum resin and epoxy resin.