RECORDING MATERIALS WITH NEW HYDROPHILIC PROTECTIVE COATINGS FOR USE IN ELECTROEROSION PRINTING

摘要

RECORDING MATERIALS WITH NEW HYDROPHILIC PROTECTIVE COATINGS FOR USE IN ELECTROEROSION PRINTING Electroerosion recording materials for "direct negative" and "offset master" are provided with a surface protective coating of solid conductive lubricant dispersed in a hydrophilic, crosslinked polymeric matrix. The protective films are especially useful where direct offset masters are produced without removal of noneroded lubricant film. The recording medium of this invention provides use as a defect-free "direct negative" and/or "direct offset master", without requiring the removal of the overlayer prior to use on the printing press. The protective coatings are applied from aqueous dispersions of polymerparticulate compositions and thus avoiding the use of organic solvents.