| abstract |
Production of polyurethanes, preferably polyurethanenpolyhydroxy compounds and organic foamsnthe polyisocyanates to be usednan amine catalyst of the cyclosilazane type,nof which 3 to 5 repeating unitsnhas a formulan- (R1R2) Si ~ NH—nwherenR1 and Ra are alkyl of 1 to 4 carbon atomsnor phenyl, in combination with tertiarynlaminmi or tin compounds. |