Electrostatic photographic liquid developer.

摘要

An electrostatic photographic liquid developer comprising a nonaqueous solvent with an electric resistance of 10<9> OMEGA cm or more and a dielectric constant of 3.5 or less, having a resin dispersed therein, wherein dispersion resin particles are copolymer resin particles obtained by the copolymerization reaction of solutions containing at least one monofunctional monomer (A) which is soluble in the nonaqueous solvent but which is rendered insoluble by polymerization, and monomer (B) which is represented by the general formula (II) below <CHEM> wherein R<1> represents an aliphatic group with 8 or more carbon atoms; T represents -COO-, -CONH-, <CHEM> where R<2> represents an aliphatic group, -OCO-, -CH2COO- or -O-; and b<1> and b<2>, which may be the same or different, each represents a hydrogen atom, an alkyl group, a -COOR<3> group or a -CH2-COOR<3> group, where R<3> represents an aliphatic group, which contains an aliphatic group with 8 or more carbon atoms and which produces a copolymer by polymerization with monomer (A); in the presence of a dispersion stabilization resin which is soluble in the nonaqueous solvent, which comprises an acidic group selected from the group consisting of a -PO3H2 group, an -SO3H group, a -COOH group, an -OH group, an -SH group, or a <CHEM> group, where R<0> denotes a hydrocarbon bonded only to one terminal of at least one main polymer chain and which is a polymer containing the repeating unit represented by the following general formula (I) <CHEM> wherein X<1> represents -COO-, -OCO-, -CH2OCO-, -CH2COO-, -O- or -SO2-; Y<1> represents an aliphatic group with 6 to 32 carbon atoms; and a<1> and a<2>, which may be the same or different, each represents a hydrogen atom, a halogen atom, a cyano group, a hydrocarbon group with 1 to 8 carbon atoms, a-COO-Z<1> group, or a -COO-Z<1> group linked via a hydrocarbon group with 1 to 8 carbon atoms, where Z<1> represents a hydrocarbon group with 1 to 22 carbon atoms; and wherein a portion of said polymer is crosslinked.