Process for the production of electrophotographic liquid developer containing gelatin

Abstract

Abstract A PROCESS FOR THE PRODUCTION OF A LIQUID DEVELOPER FOR DEVELOPING AN ELECTROSTATIC LATENT IMAGE WHICH COMPRISES THE STEPS OF (1) DISPERSING IN AN ORGANIC SOLVENT WHICH IS MISCIBLE WITH WATER BUT IS A NON-WOLVENT FOR GELATIN, AN AQUEOUS SOLUTION OF GELATIN, THE CONCENTRATION OF THE GELATIN BEING IN THE RANGE OF APPOXIMAGELY 1 TO 20% BY WEIGHT, OR A SOLUTION OF GELATIN IN A MIXED SOLVENT OF WATER AND AN ALCOHOL PREPARED BY INCORPORATING IN THE AQUEOUS SOLUTION OF GELATIN AN ALCOHOL IN AN AMOUNT CAUSING NO PRECIPITATION OF THE GELATIN TO PROVIDE A DISPERSION OF GELATIN GRAINES WHERE THE AMOUNT OF THE ORGANIC SOLVENT IS AT LEAST TEN TIMES THE AMOUNT OF THE AQUEOUS SOLUTION OF GELATIN OR THE SOLUTION OF GELATIN IN THE MIXED SOLVENT OF WATER AND ALCOHOL TO BE ADDED THERETO, (2) ADDING TO THE RESULTANT DISPERSION OF GELATIN A SOLUTION OF A RESIN WHICH IS INSOLUBLE IN THE ORGANIC SOLVENT FOR SAID GELATIN DISPERSION BUT SOLUBLE IN A CARRIER LIQUID HAVING AN ELECTRIC RESISTANCE OF HIGHER THAN 10**10 CM. TO COPRECIPIATE THE GELATIN GRAINS AND THE RESIN, AND (3) ADDING THE PRECIPITATES OF THE GELATIN GRAINS AND THE RESIN TO THE CARRIER LIQUID MENTIONED ABOVE.

Inventors

• 👤 Yasuo Tamai
• 👤 Satoru Honjo

Bibliographic Details