Technique for preparation of polyurethanes employing a tin compound as a gel catalyst and a metal soap as a blowing catalyst

Claim 1

THE PROCESS OF MAKING A CELLULAR POLYURETHANE WHICH COMPRISES REACTING A SUBSTANCE HAVING ACTIVE HYDROGEN ATOMS AS DETERMINED BY THE ZEREWITINOFF METHOD, AN ORGANIC POLYFUNCTIONAL ISOCYANATE, WATER, AND A CATALYST SYSTEM CONSISTING OF GEL CATALYST SELECTED FROM THE GROUP CONSISTING OF SN(OCOR)2 AND R''ASNXB WHEREIN R AND R'' ARE INDEPENDENTLY SELECTED FROM THE GROUP CONSISTING OF ALKYL, ALKENYL, ARYL, ARALKYL, ALKARYL AND CYCLOALKYL, X IS SELECTED FROM THE GROUP CONSISTING OF CHLORIDE AND NEGATIVE RESIDUAL PORTIONS OF CARBOXYLIC ACIDS, MERCAPTIDES, ALCOHOLS AND ESTERS OF MERCAPTOACIDS, A=1-3 AND A+B=4, AND AS BLOWING CATALYST A SOAP OF A METAL SELECTED FROM THE GROUP CONSISTING OF SILVER, ZINC, CADMIUM, AND ALUMINUM.