Liquid developer composition for lithographic masters
AssigneeA. B. Dick Company
InventorsElia P. Moschovis, John L. Gilson
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Abstract
A liquid developer for treatment to convert a latent electrostatic image to an ink receptive, water repellent, oleophilic image for use in the production of multiple copies by lithographic technique in which, in addition to the toner particles and organic solvent, the developer contains a polyvinyl acetate as a binder and a hydrophobic colloidal silica in the ratio of 1 part silica to 1.5 to 4 parts binder whereby the oleophilic properties of the image are markedly improved.
Claims9
A liquid developer composition for treatment to convert a latent electrostatic image to one that is ink receptive, water repellent and hydrophobic for use in the production of multiple copies by lithographic techique, the improvement which, in addition to the ink receptive, water repellent, oleophilic toner particles and a liquid aliphatic organic solvent having a resistivity in excess of 10.sup.10 ohms-cm consists essentially of the improvement wherein a resinous binder component is present which consists of a polyvinyl acetate resin and a hydrophobic colloidal silica present in combination with the polyvinyl acetate resin in the ratio of 1 part by weight of the hydrophobic colloidal silica to 1.5 to 4 parts by weight of the polyvinyl acetate.
Dependencies are inferred from the claim text.