| 摘要 |
PURPOSE:To obtain a liquid developer capable of forming an image high in density and quality by dispersing a toner composed essentially of a pigment and a specified resin in a liquid carrier. CONSTITUTION:The toner for use in an electrostatic photographic liquid developer to be dispersed into a liquid carrier is composed essentially of a pigment, such as phthalocyanine blue or Bordeaux 10B, and a copolymer resin of a monomer A of formula I and at least one of monomers B of formulae II-VI in which X is H or methyl; R is 6-20C alkyl and Y is COOH or CH2COOH. The monomer A is soluble in the liquid carrier and capable of dissolving the monomer B, and the monomer B has a carboxylic group. Said copolymer resin is obtained by heat polymerizing the monomers A, B. The toner contains a base, such as methylamine or systeine, in an amt. of 0.05-1.0g per 100g of said resin. As the liquid carrier, petroleum derived aliphatic hydrocarbons and perchloroethylene, etc. high in insulating property and low in dielectric constant are used. |
