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US 5,554,478 AGranted
Electrophotographic dry toner
AssigneesRicoh Company, Ltd., Mitsui Petrochemical Industries, Ltd.
InventorsShinichi Kuramoto, Yoshihisa Okamoto, Yasuo Asahina, Michio Izumi, Hidefumi Gohhara, Chiharu Mochizuki, Tomomi Suzuki, Hideo Nakamura, Masaru Wakisaka
Life of this patent
Estimating the term…
Abstract
A dry toner for use in electrophotography including a coloring agent and a polyol resin serving as a binder resin, which has a main chain portion containing an epoxy resin moiety and an alkylene oxide moiety, and protected terminal portions bonded to the main chain portion.
Claims7
A dry toner for use in electrophotography comprising:
- a coloring agent;
- and
- a polyol resin serving as a binder resin, which comprises (a) a main chain portion having a repeat unit, said main chain portion comprising an epoxy resin moiety and, in said repeat unit, at least two alkylene oxide moieties, and (b) protected terminal portions bonded to said main chain portion.
Dependencies are inferred from the claim text.