Hydrophilic protective coatings for electroerosion printing

An electroerosion recording medium, comprising

• a nonconductive support member,
• a thin conductive layer that is erodible in response to being heated in an electroerosion recording process wherein electrical current flows from a stylus that contacts said recording medium, and
• an overlayer on the stylus-contacted side of said thin conductive layer, said overlayer being a protective lubricant layer comprised of solid lubricant particles dispersed in a hydrophilic polymeric binder where said polymeric binder is a cellulose polymer.

An electroerosion recording medium, comprising:

• a nonconductive support member,
• a thin conductive layer that is erodible in response to being heated in an electroerosion recording process wherein electrical current flows from a stylus that contacts said recording medium, and
• an overlayer on the stylus-contacted side of said thin conductive layer, said overlayer being a protective lubricant layer comprised of said lubricant particles dispersed in a hydrophilic polymeric binder where said hydrophilic polymeric binder is a polymer having free reactive carboxyl groups therein.

An electroerosion recording medium, comprising:

• a nonconductive support member,
• a thin conductive layer that is erodible in response to being heated in an electroerosion recording process wherein electrical current flows from a stylus that contacts said recording medium, and
• an overlayer on the stylus-contacting side of said thin conductive layer, said overlayer being a protective lubricant layer comprised of solid lubricant particles dispersed in a cross-linkable hydrophilic polymeric binder where said overlayer is cast from an aqueous dispersion of said solid lubricant particles in said hydrophilic polymeric binder, said binder being watersoluble.