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    • 5. 发明授权
    • Positively chargeable toner for use in dry electrophotography
    • 用于干燥电子照相术的可充电的调色剂
    • US4840863A
    • 1989-06-20
    • US038822
    • 1987-04-15
    • Akira OtsuHiroshi Nagase
    • Akira OtsuHiroshi Nagase
    • G03G9/087G03G9/097
    • G03G9/08791G03G9/08728Y10S430/105
    • A positively chargeable toner for use in dry electrophotography, said toner comprising (A) a resinous binder composed of at least one resin selected from copolymers of styrene and/or alpha-methylstyrene with alkyl (meth)acrylates, polyester resins and epoxy resins, (B) 1 to 100 parts by weight, per 100 parts by weight of the resinous binder, of a copolymer containing a quaternary ammonium salt group, said copolymer having a weight average molecular weight of from 2,000 to 10,000 and composed of 65 to 97% by weight of recurring units represented by the formula ##STR1## wherein R.sub.1 represents a hydrogen atom or a methyl group, and 35 to 3% by weight of recurring units represented by the formula ##STR2## wherein R.sub.2 represents a hydrogen atom or a methyl group, R.sub.3 represents an alkylene group, and each of R.sub.4, R.sub.5 and R.sub.6 represents an alkyl group, and (C) a coloring agent.
    • 所述调色剂包含(A)由选自苯乙烯和/或α-甲基苯乙烯与(甲基)丙烯酸烷基酯,聚酯树脂和环氧树脂的共聚物中的至少一种树脂组成的树脂粘合剂,(A) B)1至100重量份,相对于100重量份树脂粘合剂,含有季铵盐基团的共聚物,所述共聚物的重均分子量为2,000至10,000,并且由65至97%的 由式(I)表示的重复单元的重量,其中R 1表示氢原子或甲基,和35〜3重量%的由式(II)表示的重复单元,其中R 2表示氢 原子或甲基,R 3表示亚烷基,R 4,R 5和R 6各自表示烷基,(C)着色剂。