Method of preparing asbestos sheets from aqueous slurries containing silicone resin emulsions

Claim 1

THE METHOD OF PREPARING SHEETS OF ASBESTOS FIBERSILICONE RESIN ARTICLES CONSISTING ESSENTIALLY OF ADDING AN AQUEOUS SLURRY OF ASBESTOS FIBERS TO AN AQUEOUS EMULSION CONTAINING 20 TO 60% BY WEIGHT SILICONE RESIN PREPARED BY EMULSIFYING 100 PARTS BY WEIGHT OF AN ORGANOSILOXANE POLYMER WHICH IS SOLUBLE IN BENZENE WHEREIN THE ORGANIC SUBSTITUENTS ARE METHYL RADICALS, THE METHYL TO SILICON RATIO IS IN THE RANGE 0.8/1 TO 1.15/1, SAID POLYMER CONTAINING AN AVERAGE OF AT LEAST TWO REACTIVE GROUPS PER MOLECULE SELECTED FROM THE GROUP CONSISTING OF 0.5 TO 1.0% BY WEIGHT HYDROXYL GROUPS AND 0.5 TO 10% BY WEIGHT ALKOXY GROUPS, DISSOLVED IN 10 TO 20 PARTS BY WEIGHT OF AN ORGANIC SOLVEN, A NON-IONIC EMULSIFYING AGENT SELECTED FROM THE GROUP CONSISTING OF (1) 0.5 TO 2.0 PARTS BY WEIGHT OF AN ALKARYL DERIVATIVE OF A POLYETHYLENE GLYCOL CONTAINING 8 TO 14 INCLUSIVE ETHYLENE OXIDE UNITS AND HAVING A HYDROPHOBIC PORTION CONSISTING OF AN AROMATIC RADICAL SUBSTITUTED WITH AT LEAST ONE ALKYL GROUPS, THE ALKYL SUBSTITUENTS CONTAINING A TOTAL OF AT LEAST 10 AND NOT MORE THAN 15 CARBON ATOMS AND (2) 2 TO 4 PARTS BY WEIGHT OF A SAPONIFIED POLYVINYL ACETATE WITH A DEGREE OF SAPONIFICATION OF 70 TO 98% AND A MOLECULAR WEIGHT DISTRIBUTION BETWEEN 2,000 AND 800,000, AND A CURING CATALYST SELECTED FROM THE GROUP CONSISTING OF (1) .03 TO 1 PART BY WEIGHT OF AN ALUMINUM CHELATE SELECTED FROM THE GROUP CONSISTING OF ALUMINUM CHELATES OF MALONIC ESTER, ACETOACETIC ESTER AND ACETYL ACETONATE AND (2) 0.1 TO 3 PARTS BY WEIGHT OF A DIALKYL TIN DIACYLATE AND WATER, BREAKING THE EMULSION, MOLDING THE SHEET BY WITHDRAWING THE WATER, DRYING THE SHEET AND CURING THE SILICONE RESIN.