Stabilization of polyurethane resin foams

Claim 1

A PROCESS FOR PRODUCING A FLEXIBLE POLYETHER BASED FOAMED POLYURETHANE RESIN STABILIZED AGAINST DETERIORATION WHICH COMPRISES MIXING TOGETHER A POLYALKYLENE POLYETHER HAVING A HYDROXYLIC FUNTIONALITY OF AT LEAST 2, AN ORGANIC POLYISOCYANATE, WATER, A SURFACE ACTIVE AGENT AND A CATALYST, MIXTURE INCLUDING AMINE AND AN ORGANO METALLIC TIN CATALYST PRESENT IN CATALYTIC AMOUNTS WHICH TENDS TO PROMOTE DECOMPOSITION OF THE ETHER LINKAGE OF SAID FOAMED RESIN, AND THEREAFTER ALLOWING THE RESULTING REACTION MIXTURE TO REACT AND FOAM THEREBY FORMING FLEXIBLE POLYURETHANE FOAMED RESIN, THERE BEING PRESENT IN SAID REACTION MIXTURE AT THE TIME OF FOAMING, AS A STABILIZER FOR THE RESULTING FOAMED RESIN, AT LEAST ONE HALOGEN CONTAINING MATERIAL OF THE GROUP CONSISTING OF (A) ESTERS OF (1) HALOGENATED ALCOHOLS SELECTED FROM THE GROUP CONSISTING OF 2-CHLOROETHANOL AND DICHLOROPROPANOL AND (2) ACIDS SELECTED FROM THE GROUP CONSISTING OF PHOSPHORIC ACID, BORIC ACID AND P-TOLUENE SULFONIC ACID, AND (B) HALOGENATED HYDROCARBONS HAVING CHLORINE AS THE SOLE HALOGEN, THE CHLORINE CONTENT THEREOF BEING AT LEAST ABOUT 25% BY WEIGHT OF THE TOTAL WEIGHT, SAID HALOGENATED HYDROCARBONS BEING SOLUBLE IN AT LEAST ONE OF SAID POLYETHER, POLYISOCYANATE AND WATER AND COMPATIBEL IN THE SYSTEM RESULTING FROM THE ADMIXTURE OF SAID POLYETHER, ISOCYANATE AND WATER, SAID (A) AND (B) BEING PRESENT IN AN AMOUNT OF FROM ABOUT 0.5% TO ABOUT 5.0% BY WEIGHT OF SAID POLYETHER.