A method for production of hard, compact polyurethane or polyurethane foams in the presence of an amine useful for achieving the desired flowability of the reaction mixture during their preparation

摘要

Polyurethanes are prepared by reaction of: (a) at least one polyisocyanate with (b) at least two compounds having at least two hydrogen atoms reactive to isocyanates, by insertion of the liquid starting components into a mold on the surface of a building component, and finally insertion of the building component with the starting components into a closed mold. The compounds with at least two hydrogen atoms reactive to isocyanate groups are selected from 1-5C, preferably 2C dialkyltoluylenediamines in the alkylene chain and 2,2'-dimethyl-4,4'-methylene bis(cyclohexylamine). An Independent claim is included for a polyurethane prepared as above.