| abstract |
FLAME-RESISTANT POLYURETHANE FOAMS ARE DISCLOSED WHICH ARE PREPARED BY REACTING A POLYETHER POLYOL HAVING A MOLECULAR WEIGHT OF FROM ABOUT 750 TO ABOUT 10,000 IN WHICH AT LEAST 10% OF THE POLYISOCYANATE WHICH IS A SOLUHYDROXYL GROUPS, WITH A POLYISOCYANATE WHICH IS A SOLUTION OF FROM ABOUT 10 TO ABOUT 70% BY WEIGHT OF AN ORGANIC POLYISOCYANATE CONTAINING AT LEAST ONE N,N''-DISUBSTITUTED ALLOPHANIC ACID ESTER GROUP DISSOLVED IN A LIQUID POLYISOCYANATE WHICH IS FREE FROM ALLOPHANIC ACID ESTER GROUPS. |