Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Post imaging process – finishing – or perfecting composition...
Patent
1989-04-14
1991-10-29
McCamish, Marion E.
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Post imaging process, finishing, or perfecting composition...
430137, 430904, G03G 900, G03G 500
Patent
active
050615882
ABSTRACT:
A dry type toner for electrophotography is disclosed which comprises as the main components (a) a coloring agent; and (b) a polyol resin serving as a binder agent in an effective amount, the polyol resin being prepared by subjecting a bisphenol-type epoxy resin containing epoxy groups, which may contain secondary hydroxyl groups, to reaction steps (1), (2) and (3), or steps (2) and (3), in any sequential combination, until substantially no epoxy groups remain in the polyol resin, wherein the reaction step (1) comprises a step of causing the epoxy groups in the bisphenol-type epoxy resin to react with a primary amine; the reaction step (2) comprising a step of causing the epoxy groups to react with a compound containing one active hydrogen capable of reacting with the epoxy groups; and the reaction step (3) comprising a step of esterifying at least part of the secondary hydroxyl groups or hydroxyl groups produced in the bisphenol-type epoxy resin by reaction step (1) and/or reaction step (2) by use of an esterifying agent.
REFERENCES:
patent: Re31022 (1982-08-01), Buchwalter et al.
patent: 3681106 (1972-08-01), Burns et al.
patent: 4522984 (1985-06-01), Watanabe et al.
patent: 4829105 (1989-05-01), Yamada et al.
Aoki Mitsuo
Asahina Yasuo
Fushimi Hiroyuki
Makita Kayo
Nakayama Nobuhiro
Crossan S. C.
McCamish Marion E.
Mitsui Petrochemical Industries, Ltd.
Ricoh & Company, Ltd.
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