Preparation of photoconductive recording materials
Abstract
Abstract A POROUS PHOTOCONDUCTIVE RECORDING LAYER IS OBTAINED BY DISPERSING INORGANIC PHOTOCONDUCTIVE PARTICLES SUCH AS PHOTOCONDUCTIVE ZINC OXIDE IN AN ORGANIC SOLVENT SOLUTION HAVING DISSOLVED THEREIN A MIXTURE OF POLYMERIC BINDING AGENTS FOR THE PHOTOCONDUCTIVE PARTICLES WHICH INCLUDES AT LEAST TWO POLYMERS WHICH ARE BOTH INSOLUBLE IN WATER AT PH 7, ARE SOLUBLE TO DIFFERENT EXTENTS, I.E., DIFFERENTIALLY SOLUBLE IN THE ORGANIC SOLVENT SOLUTION, FORM A CLEAR SOLUTION WITHOUT NOTICEABLE TURBIDITY WHEN SO DISSOLVED, AND ARE MUTUALLY INSOLUBLE IN ONE ANOTHER WHEN IN THE SOLID STATE; COATING THE RESULTANT DISPERSION ON A APPROPRIATE SUPPORT; DRYING THE COATING AT A RATE SUFFICIENT TO PRECIPITATE AT LEAST A PORTION OF ONE POLYMER PRIOR TO TH EPRECIPITATION OF THE OTHER POLYMER; AND THEN COMPLETING THE DRYING OF THE COATING. AS A RESULT OF THE PREFERENTIAL PRECIPITATION OF THE LESSER SOLUBLE POLYMER, THERE RESULTS A DRIED COATING STRUCTURE CONTAINING RANDOM INTERCONNECTING MICROSCOPIC CAVITIES.
Inventors
- 👤 Karel Eugeen Verhille
- 👤 Robert Joseph Noe
Bibliographic Details
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