| 摘要 |
<p>1. A process for the preparation of molded parts based on polyurea elastomers by reacting a) organic polyisocyanates, b) polyether polyamines, and c) alkyl-substituted aromatic diamines, wherein the polyether polyamines (b) used are polyoxyalkylene polyamines having a molecular weight of from 1 100 to 16 000 and the general structural formulae H2 N-(R**2 O)x -R**1 -NH2 H2 N-R**1 -(OR**2 )x -NH-(R**2 O)y -R**1 -NH2 see diagramm : EP0093334,P12,F1 and/or see diagramm : EP0093334,P12,F2 where R**1 and R**2 are identical or different optionally substituted alkylene radicals of 2 to 10 carbon atoms, the alkylene radicals R**2 of the alkoxy groups also being identical or different, T is a radical or a trifunctional initiator molecule for the alkylene oxide polymerization, which radical does not contain any reactive hydrogen atoms, and x, x', z, z', y and y' are identical or different integers greater than 0, and the alkyl-substituted aromatic diamines (c) used are meta-phenylene diamines of the formulae see diagramm : EP0093334,P12,F3 and/or see diagramm : EP0093334,P12,F4 where R**3 is a branched alkyl of up to 10 carbon atoms, in which the branching point is at the C1 -carbon atom, and R**4 and R**5 are identical or different alkyls of 1 to 3 carbon atoms, and/or diaminodiphenyl-methanes of the formula see diagramm : EP0093334,P13,F1 where R**6 , R**7 , R**8 and R**9 are identical or different and each denote methyl, ethyl, propyl, isopropyl, sec-butyl and tert-butyl, but at least one of the radicals is isopropyl or sec-butyl.</p> |
