| 摘要 |
PURPOSE:To obtain a liquid developer which can be preserved and used for a long period of time by polymerizing a monomer which is soluble in a carrier liquid but is made insoluble therein when polymerized in the presence of a dispersion stabilizer soluble in the carrier liquid which is the polymerizable monomer obtd. by bringing a specific monomer into reaction with a specific copolymer. CONSTITUTION:The polymer having an unsatd. bond is obtd. by bringing the monomer E from the group of formula II into reaction with the copolymer of the monomer C from the group of the specification and the monomer D from the group of formula I out of the two groups expressed by formulas I, II (X, Y are -O-, -S-, -CONH, etc., R1 is hydrocarbon of 4-20 C, Z is -CO2H, epoxy, -COCl, -NH2, etc., R3 is hydrocarbon, L is hydrocarbon to combine Y and Z and may be intervened with a hetero atom, L may be absent in some case, aa, a2, a3, b1, b2, b3 and H, hydrocarbon,CO2H or CO2H via hydrocarbon). Such polymer is the dispersion stabilizer which is soluble in the liquid developer carrier liquid for electrophotography. The monomer A which is soluble in the carrier liquid and is insolubilized when polymerized and the monomer B from the group of formula I are copolymerized in the presence of such polymer and the developing soln. for electrophotogrpahy which is stable for a long period of time and forms a high-quality image even after repetitive use is obtd.
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