Persistent antifoam compositions and methods of making same utilizing basic materials
Abstract
Abstract ANTIFOAM COMPOSITIONS HAVING PERSISTENT EFFECTIVENESS ESPECIALLY IN AQUEOUS ALKALINE MEDIUM, SAID COMPOSITIONS BEING A MIXTURE RESULTING FROM HEATING A POLY(DIORGANOSILOXANE) LIQUID, A FINELY DIVIDED INORGANIC FILLER, SUCH AS SILICA, ALUMINUM OXIDE AND TITANIUM DIOXIDE, AND A BASIC MATERIAL, SUCH AS, ALKALI METAL AND ALKALINE EARTH METAL OXIDES, HYDROXIDES, ALKOXIDES, ARYLOXIDES AND SILANOLATES, TETRAALKYLAMMONIUM HYDROXIDES, ALKOXIDES AND SILANOLATES, TETRAALKYLPHOSPHONIUM HYDROXIDES, ALKOXIDES AND SILANOLATES, TRIALKYTHYDRAZINIUM HYDROXIDES, ALKOXIDES AND SILANOLATES, AND TRIALKYLGUANIDINIUM HYDROXIDES, ALKOXIDES, AND SILANOLATES, AND MONOALKYL, DIALKYL AND TRIALKYL AMINES. ALSO, ALKALINE AQUEOUS LIQUIDS, E.G., SYNTHETIC RUBBER LATICES, CONTAINING SUCH NOVEL ANTIFOAM COMPOSITIONS. PROCESSES FOR PRODUCING SUCH PERSISTENT ANTIFOAM COMPOSITIONS BY HEATING THE POLY(DIMETHYLSILOXANE) LIQUID IN THE PRESENCE OF THE FINELY DIVIDED INORGANIC FILLER AND THE BASIC MATERIAL AS ABOVE ILLUSTRATED AT A TEMPERATURE IN A BROAD RANGE, FOR EXAMPLE; 100 TO 300*C., FOR A PERIOD OF TIME IN A BROAD RANGE, E.G., ONE-HALF TO FIVE HOURS. ALSO, PROCESSES FOR SUPPRESSING FOAM OVER LONG PERIODS UTILIZING SUCH NOVEL ANTIFOAM COMPOSITIONS.
Inventors
- 👤 Matthew J O'hara
- 👤 Donald R Rink
Bibliographic Details
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