| 摘要 |
An liquid developer for electrostatic photography is described, comprising a carrier liquid having an electric resistance of at least 109 OMEGA xcm and a dielectric constant of not more than 3.5, and a resin dispersed therein, said resin being obtained by polymerizing a monomer, which is soluble in said carrier liquid but becomes insoluble upon being polymerized, in the presence of at least one kind of a soluble dispersion stabilizing resin, said soluble dispersion stabilizing resin being a copolymer containing at least recurring units represented by following formulae (IIIa) and (IIIb) obtained by applying a reaction for introducing an unsaturated bond into a copolymer obtained by polymerizing a monomer represented by formula (I) and a monomer represented by formula (III) <IMAGE> (I) <IMAGE> (II) <IMAGE> (IIIa) <IMAGE> (IIIb) wherein in formula (I), V represents -O-, -S-, -CO-, -CO2-, -SO2-, -OCO-, -CONH-, -CONR'- (wherein R' represents a hydrocarbon group), -NHCO-, NHCO2-, or -NHCONH-; X represents -CO2H, -COCl, -OH, -SH, -NH2, -NCO, or -SO2CH2CH2Cl; W represents a hydrocarbon group linking said atomic group V and said atomic group X directly or through a hetero atom, or W represents a chemical bond; and a1, a2, and a3 each represents a hydrogen atom, a hydrocarbon group, a carboxy group, or a carboxy group through a hydrocarbon group; in formula (II), Y represents -O-, -S-, -CO-, -CO2-, -SO2-, -OCO-, CONH-, -CONR''- (wherein R'' represents a hydrocarbon group), -NHCO-, -NHCO2-, or -NHCONH-; R represents a hydrocarbon group; and b1, b2, and b3 each represents a hydrocarbon atom, a hydrocarbon group, a carboxy group, or a carboxy group through a hydrocarbon group; in formula (IIIa), a1, a2, a3, V, and W have the same meanings as defined for formula (I); X' represents -CO2-, -COS-, -SCO-, -CONH-, -OCO-, -NHCO-, -NHCONH-, -SO2-, -O-, or -S-; Z represents a hydrocarbon group linking said atomic group X' and unsaturated bond directly or through a hetero atom, or Z represents a chemical bond; the total number of atoms of the main chain portion of atomic group -V-W-X'-Z- must, however, be at least 9; and d1, d2, and d3 each represents a hydrocarbon atom, a hydrocarbon group, a carboxy group, or a carboxy group through a hydrocarbon group; and in formula (IIIb), b1, b2, b3, Y, and R have the same meanings as defined for formula (II).
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