Preparation of polyurethane foams containing an aluminum silicate filler

Claim 1

IN THE PREPARATION OF CELLULAR POLYURETHANES WHEREIN A REACTIVE HYDROGEN LIQUID HAVING A MOLECULAR WEIGHT BETWEEN ABOUT 500 AND 3,000, A HYDROXYL NUMBER BETWEEN ABOUT 20 AND ABOUT 300 AND SELECTED FORM THE CLASS CONSISTING OF POLYALKYLENE ETHERS, FATTY ACID GLYCERIDES, POLYESTERS OF DIBASIC ACIDS AND DIHYDRIC ALCOHOLS HAVING ACID NUMBERS LESS THAN ABOUT 10, AND MIXTURES THEREOF, IS REACTED WITH AN EXCESS OF AN ARYLENE DIISOCYANATE IN THE PRESENCE OF A BLOWING AGENT, A CATALYST AND A SURFACE ACTIVE AGENT; THE IMPROVED METHOD OF INCORPORATING AN ALUMINUM SILICATE SOLID FILLER WITHIN SAID CELLULAR POLYURETHANE WHICH COMPRISES FORMING A SUSPENSION OF SAID ALUMINUM SILICATE SOLID IN A VOLATILE ORGANIC LIQUID HAVING A BOILING POINT LOWER THAN SAID REACTIVE HYDROGEN LIQUID, ADMIXING SAID SUSPENSION WITH SAID REACTIVE HYDROGEN LIQUID, REMOVING SAID VOLATILE ORGANIC LIQUID BY EVAPORATION AND THEREAFTER ADMIXING AND REACTING SAID REACTIVE HYDROGEN LIQUID WITH SAID ARYLENE DIISOCYANATE.