Polyurethane composition containing a chlorinated phosphate ester and a basic lithium compound and process of making same

Claim 1

IN A PROCESS FOR PRODUCING FLAME-RETARDANT POLYURETHANE FOAMS IN WHICH A REACTANT MIXTURE IS PREPARED COMPRISING WATER, A PREPOLYMER OF A POLYESTER CONTAINING FREE HYDROXYL GROUPS, AN ORGANIC DIISOCYANATE, A CHLORINATED PHOSPHATE ESTER IN WHICH THE CHLORINE IS LINKED TO AN ALIPHATIC CARBON AND A CATALYST FOR THE REACTION OF SAID POLYESTER PREPOLYMER WITH SAID DIIOCYANATE AND IN WHICH SAID REACTANT MIXTURE IS PERMITTED TO REACT TO PRODUCE SAID POLYURETHANE FOAM, THE IMPROVEMENT WHICH COMPRISES INCLUDING IN SAID REACTANT MIXTURE A SUFFICIENT AMOUNT OF A BASIC LITHIUM-CONTAINING COMPOUND SO THAT THE FOAM PRODUCED HAS A LITHIUM CONTENT OF AT LEAST 0.025 PERCENT BY WEIGHT, SAID LITHIUM-CONTAINING COMPOUND ACTING TO STABILIZE SAID POLYURETHANE FOAM AGAINST DEGRADATION UPON EXPOSURE TO HIGH HUMIDITY AT ELEVATED TEMPERATURES.