摘要:
NON-YELLOWING FLEXIBLE POLYURETHANE FOAM IS PREPARED BY REACTING DIMETHYLBENZENE W,W''-DIISOCYANATE AND POLYOL IN THE PRESENCE OF A BLOWING AGENT, MONOAMINO ALCOHOL HAVING 1 TO 4 CARBON ATOMS AND OCTAALKY-STANNOXANE CATALYST.
摘要:
AS CATALYST FOR THE REACTION OF AN ISOCYANATE WITH A COMPOUND HAVING ACTIVE HYDROGEN ATOMS, CERTAIN OCTAALKYL-STANNOXANES(I) E.G. OCTABUTYL-DICHLORO-DIHYDROXYSTANNOXANE, OCTABUTYL - DIACETOXY-DIHYDORXY-STANNOXANE, OCTABUTYL - TETRAACETOXY-STANNOXANE, OCTABUTYL-DIMETHOXYDIACETOXY - STANNOXANE, OCTABUTYL-TETRAISOCYANATE-STANNOXANE, OCTABUTYLTETRAISOTHOCYANATE-STANNOXANE, AND OTHERS NAMED IN THE SPECIFICATION INFRA, UNEXPECTEDLY HAVE A CATALYTIC ACTIVITY WHICH IS SEVERAL TENFOLD TIMES HIGHER THAN THAT OF THE COMPOUNDS (E.G. DIBUTYLTIN-DILAURATE, TIN(II)2-ETHYLHEXOATE, TRIETHYLENEDIAMINE, ETC.) WHICH HAVE HERETOFORE BEEN REGARDED AS HAVING THE HIGHEST CATALYST ACTIVITY FOR THE SAID REACTION. COMPOUNDS I CAN BE USED AS SOLE CATALYST FOR THE PRODUCTION OF POLYURETHANE FOAM, AND ARE MORE STABLE THAN HITHERTO-EMPLOYED CATALYSTS.