Method of making high opacity resin porous films and aqueous latex for producing said films
Abstract
Abstract AN AQUEOUS LATEX COATING COMPOSITION ADAPTED TO DEPOSIT FILMS WHICH DRY TO FORM A CELLULAR LAYER OF HIGH OPACITY IS PROVIDED BY SWELLING THE RESIN PARTICULES OF THE AQUEOUS LATEX WITH A PRIMARY ORGANIC SOLVENT WHICH IS ESSENTIALLY IMMISICIBLE IN THE AQUEOUS PHASE OF THE LATEX SUCH AS XYLENE, AND BY INTRODUCING INTO THE AQUEOUS PHASE AN AT LEAST PARTIALLY WATER MISCIBLE ORGANIC SOLVENT, SUCH AS PROPYLENE GLYCOL, HAVING A LOWER EVAPORATION RATE AND A LESSER CAPACITY FOR SOLVATING THE RESIN OF THE LATEX THAN SAID PRIMARY SOLVENT. WHEN THE PRIMARY SOLVENT EVAPORATES, A CELLULAR FILM IS FORMED, THE SECONDARY SOLVENT SERVING TO INCREASE THE OPACIFICATION WHICH IS OBTAINED. PARTICULATE MATTER OR MATERIAL WHICH CRYSTALLIZES TO FORM PARTICULATE MATTER IS INCORPORATED INTO THE LATEX IN SMALL AMOUNT. THE PARTICULATE MATTER SERVES TO INCREASE ULTIMATE OPACITY AND ALSO TO GENERATE OPACITY MORE RAPIDLY WHEN A DEPOSITED FILM IS DRIED.
Inventors
- 👤 R Kreider
Bibliographic Details
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