Liquid developer for developing an electrostatic latent image

Claim 1

A liquid developer for developing an electrostatic latent image comprising an electrically insulating carrier liquid, a toner dispersed therein, and a copolymer for rendering the toner negatively charged composed of at least one member selected from the monomers of the formula (1) at least one member selected from the monomers of the formula (2) and at least one member selected from the monomers of the formula (3), ##STR5## wherein X is selected from the class of H and CH 3 and Y 1 is selected from the class of --C n H 2n +1 , --OC n H 2n +1 and --COOC n H 2n +1 , wherein n is an integer from 8 to 20; ##STR6## wherein X is selected from the class of H and CH 3 and Y 2 is selected from the class of the following: ##STR7## wherein R 1 is selected from the class of H and --C n H 2n +1 (1 ≦ n ≦ 4), and R 2 is selected from the class of H, --C m H 2m +1 (1 ≦ m ≦ 4), ##STR8## wherein X 1 is selected from H, CH 3 and COOM and M is selected from the class of an alkali metal and an alkaline earth metal, said monomers of formulae (1), (2), and (3) in a mole ratio sufficient to prevent a decrease in the solubility of the copolymer in the carrier liquid.