| 摘要 |
<p>1390702 Polyurethane foam MARLESKUHLMANN-WYANDOTTE 19 June 1973 [19 June 1972 29050/73 Heading C3R Flexible polyurethane foam is prepared by reacting, in the presence of water, a polyalkylene polyether polyol with a polyisocyanate, using an isocyanate index of 115-120 in the presence as catalyst of a 1,3,5-tris-(N,N- dialkylaminoalkyl) - s - hexahydrotriazine or an alkylene oxide and water adduct thereof. The polyisocyanate may be toluene diisocyanate, polymethylene polyphenyl polyisocyanate or crude methylene di - (phenyl isocyanate). A suitable catalyst is 1,3,5-tris- (3 - dimethylaminopropyl) - s - hexahydrotriazine. A conventional urethane forming catalyst may additionally be employed and optionally a silicone surfactant.</p> |
