Color electrophotographic process with resin deposition for stabilization of tonor image

Abstract

Abstract IN AN ELECTROPHOTOGRAPHIC PROCESS FOR OBTAINING A MULTICOLOR IMAGE BY PERFORMING AN ELECTROPHOTOGRAPHIC PROCEDURE INCLUDING THE STEPS OF ELECTROSTATIC CHARGING EXPOSING, AND DEVELOPING THREE OR MORE TIMES REPEATEDLY ON A SINGLE ELECTROPHOTOGRAPHIC SENSITIVE MATERIAL, THE IMPROVEMENT CONPRISING A COLOR ELECTROPHOTOGRAPHIC PROCESS FOR ENHANCING THE MECHANICAL STRENGTH OF THE IMAGE CHARACTERIZED BY (1) PROVIDING A PHOTOCONDUCTIVE ZINC OXIDE SPECTRALLY SENSITIZED SO AS TO EXHIBIT PHOTO-RESPONSE THROUGH OUT A SUBSTANTIAL PART OF THE VISIBLE SPECTRUM, (2) PROVIDING A BINDER FOR THE ZINC OXIDE CONSISTING ESSENTIALLY OF A POLYISOCYANATE CROSS-LINKED POLYHYDROXYL RESIN WHICH FORMS A THREE-DIMENSIONAL MOLECULAR STRUCTURE, (3) CARRYING OUT THE DEVELOPMENT WITH A LIQUID DEVELOPER COMPRISING AN INSULATIVE CARIER LIQUID WITH A COMPONENT DISSOLVED THEREIN AND FINELY DIVIDED ELECTRICALLY CHARGED PARTICLES DISPERSED THEREIN ON THE SURFACE OF WHICH PART OF THE RESIN COMPONENT IS ADSORBED OR ASSOCIATED, AND (4) BRINGING THE SURFACE OF THE DEVELOPED SENSITIVE LAYER WHILE STILL WET WITH THE DEVELOPER INTO CONTACT WITH A RINSING LIQUID HAVING LESS DISSOLVING POWER FOR THE AFOREMENTIONED RESIN COMPONENT IN THE DEVELOPER THAN THAT OF THE CARRIER LIQUID THEREBY REMOVING THE DEVELOPER FROM THE NON-IMAGE AREAS AND CAUSING INSOLUBILIZATION OF THE RESIN COMPONENT WHICH DEPOSITS AROUND THE DEPOSITED TONER TO INCREASE THE MECHANICAL STRENGTH OF THE IMAGE.

Inventors

• 👤 Satoru Honjo
• 👤 Yasuo Tamai
• 👤 Masamichi Sato
• 👤 Seiichi Matsumoto
• 👤 Hasaaki Takimoto

Bibliographic Details