| abstract |
A liquid developer for electrostatic photography is prepared by dispersing in a dispersion medium composed essentially of a paraffinic hydrocarbon, an alkylaminoethyl methacrylatecontaining polymer; a carboxyl group-containing copolymer or acrylic or methacrylic acid and an ester thereof; a coloring material; and/or a dihydroabietic ester. Colloidal particles of the developer have favorable electric charging properties, and, after development of a photoconductive material and simultaneously with the drying of the liquid, they firmly adhere to the photo-sensitive layer to give a clear image. Further, the developer, which is a colloidal dispersion system, is stable and does not easily cause precipitation or agglomeration. |