Hitachi Chemical Company, Ltd.

Isamu Moribe

Hiroyuki Tanaka

Seiji Tai

Yuugo Kumagai

Chie Ohdoi

Hisanori Takusari

Takayuki Saito

Akihiro Kobayashi

Toshiyuki Fujita

Osamu Higashida

Ikutoshi Shibuya

Hajime Yamamoto

A coating resin comprising a polymer obtained by polymerizing an unsaturated monomer represented by the formula (I): ##STR1## wherein R is H or an alkyl group, and X is selected from: ##STR2## wherein R.sup.1 to R.sup.8 represent independently a hydrocarbon group, etc., and Py is a pyridyl group, alone or together with one or more other unsaturated monomers can give an antifouling coating composition having no safety problem, good storage stability and excellent antifouling effect for a long period of time.

Coating resin and antifouling coating composition

A toner comprising a vinyl polymer having a hydroxyl number of 50 to 350 and a glass transition point of 35.degree. to 100.degree. C., obtained from one or more monomers having a secondary hydroxyl group and, if necessary, one or more vinyl monomers copolymerizable with the vinyl monomer having a secondary hydroxyl group, is excellent in resistance to adhesion to non-rigid polyvinyl chloride and resistance to blocking under high humidity.

Toner for developing electrostatic image comprising vinyl polymer having

A toner for developing latent electrostatic images comprising a copolymer having as an essential component a monomer unit derived from an imido group-containing unsaturated monomer of the formula: ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 are as defined in the specification, has excellent properties such as resistance to adhesion to plasticized polyvinyl chloride, high image density, resistance to fogging, etc.

Electrophoto toner comprising imido group monomer unit in polymer

A toner comprising a resin, a colorant and a positive charge control agent selected from the group consisting of mica, monoalkyl and dialkyl tin oxides and urethane compounds, said charge control agent having high positive charging ability and good dispersibility in the resin, can be used for developing to give good quality images, having high density in the image areas and low background in the non-image areas.

Positively chargeable powdered electrophotographic toner containing

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Tokushima, Japan

Isamu Moribe