Liquid developer for electrophotography

Claim 1

A liquid developer for electrophotography, said developer comprising a non-aqueous solvent having toner particles dispersed therein, said particles comprising: a colorant; a high molecular compound produced in a non-aqueous medium by polymerization of a first monomer component, said first component being soluble in said non-aqueous solvent and being represented by general formula 1 ##STR5## wherein R is selected from H, --CH 3 , and --C 2 H 5 , A is selected from --COOC n H 2n+ 1 and --OC n H 2n+ 1, n being an integer of from 6 to 20, and a second monomer component insoluble or slightly soluble in said aqueous solution, said second component being at least one monomer selected from vinyl monomers and vinyl carboxylic acid monomers, provided that the monomers are substituted with a substitutent so that Taft's aliphatic polar substituent constant σ is not less than 0.45 in absolute value, and said high molecular compound is present in an amount of from 2.5×10 -4 to 5.5×10 -4 mols per gram of said colorant and; a thermoplastic resin selected from the group consisting of waxes, polyolefins, and mixtures thereof, which is insoluble or slightly soluble in said non-aqueous solvent at ordinary temperatures, wherein said thermoplastic resin comprises from 5 to 95% of the total amount of said high molecular compound and said thermoplastic resin, and the number of toner particles having a diameter less than 0.06 μm is not more than 5%, and the number of particles exceeding 1.5 μm in diameter is not more than 3%, both based on the total number of toner particles.