Aqueous acidic polyvinyl alcoholsilica solution
Abstract
Abstract COMPOSITIONS OF COLLOIDAL SILICAL HAVING THE AVERAGE PARTICLE SIZE DIAMETER OF 4-30 NANOMETERS AND OF POLYVINYL ALCOHOL FORM COHERENT, HOMOGENEOUS FILMS THAT ARE WATER-RESISTANT, PROVIDED THE PH OF SUCH COMPOSITIONS IS LESS THAN ABOUT 6 AND THAT THE FOLLOWING REQUIREMENTS ARE SATISIFIED: THE WEIGHT RATION OF SILICAL TO THE POLYVINYL ALCOHOL IS GREATER THAN THE NUMERICAL VALUE OF 0.0062 D.2 BUT LESS THAN THE NUMERICAL VALUE OF 0.25 D., WHERE D. IS THE AVRAGE PARTICLE DIAMETER OF THE COLLODIAL SILICA EXPRESSED IN NANOMETERS; BUT THIS RATIO IS ALWAYS AT LEAST 0.22. THE SILICA/POLYVINYL ALCOHOL FILMS OBTAINED IN THIS MANNER ARE USEFUL FOR GREASEPROOFING AND WATERPROOFING PAPER AND ARTICLES AND FOR RENDERING SURFACES SLIP-RESISTANT.
Inventors
- 👤 R Iler
Bibliographic Details
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