Inorganic photoconductive pigments in an alkali soluble binder containing a polymeric dispersing agent

Abstract

Abstract A RECORDING MATERIAL INCLUDING AN ELECTRICALLY CONDUCTIVE SUPPORT CARRYING A COATING COMPRISING: (1) 60-95% BY DRY WEIGHT OF A FINELY DIVIDED INORGANIC PIGMENTARY MATERIAL HAVING A PHOTOCONDUCTIVE PROPERTIES AND SELECTED FROM BASIC OR AMPHOTERIC OXIDES AND METAL SULPHIDES DERIVED FROM METALS FORMING BASIC OR AMOPHOTERIC OXIDES, (2) A NORMALLY ELECTRICALLY INSULATING ALKALI-SOLUBLE BINDER IN AN EFFECTIVE BINDING AMOUNT, AND (3) A WATER-SOLUBLE POLYMERIC DISPERSING AGENT DIFFERING IN CHEMICAL STRUCTURE FROM THE BINDER PRESENT IN SAID COATING IN A RATIO BY WEIGHT OF ABOUT 0.1 TO 1.5% BY WEIGHT OF PIGMENTARY MATERIAL. THE DISPERSING AGENT IS EITHER (A) A COPOLYMER WITH SOME RECURRING UNITS THEREOF DERIVED FROM A POLYMERIZABLE UNSATURATED MONOCARBOXYLIC ACID, ITS ANHYDRIDE OT A SALT THEREOF, AND OTHER RECURRING UNITS DERIVED FROM A POLYMERIZABLE UNSATURATED COMPOUND CONTAINING AN AMINO GROUP, A CARBALKOXY GROUP, A CARBAMYL GROUP, AN N-PYRROLIDONE GROUP OR AN ETHER GROUP, OR (B) COPOLYMER HAVING SOME RECURRING UNITS THEREOF DERIVED FROM A POLYMERIZABLE UNSATURATED DICARBOXYLIC ACID, ITS ANHYDRIDE OR SALT THEREOF, AND OTHER RECURRINGS UNITS DERIVED FROM A POLYMERIZABLE UNSATURATED COMPOUND CONTAINING AN ESTER GROUP, AN AMINO GROUP, A CARBALKOXY GROUP, A CARBAMYL GROUP, AN N-PYRROLIDONE GROUP OR AN ETHER GROUP.

Inventors

• 👤 K Verhille
• 👤 L Voet

Bibliographic Details