| abstract |
The invention relates to a simplified one-step process for the preparation of polyamines with aromatic and / or aliphatic primary amino groups, preferably aromatic amino groups, by hydrolysis of compounds having terminal isocyanate groups and having an NCO content of 0.5 to 40% by weight with equivalent or excess amounts Water in the presence of catalysts from the series of carbonates, bicarbonates or carboxylic acid salts, preferably with alkali ions, in the presence of water-soluble solvents such as dioxane or dimethylformamide at preferably elevated reaction temperatures. Modified isocyanates or NCO prepolymers or semiprepolymers are used as compounds containing isocyanate groups. The hydrolysis leads directly to the polyamines with elimination of carbon dioxide, which can be separated or isolated by customary methods.n n n The invention further relates to polyamines produced in this way with an amino group content of 0.19 to 20.3% by weight and also to their use as starting components in the production of polyurethanes. |