| 摘要 |
<p>1. A process for the preparation of non-cellular or cellular molded parts based on polyurea-polyurethane elastomers by reacting a) organic polyisocyanates, b) polyether polyamines, and c) chain extenders in the presence or absence of d) blowing agents, e) auxiliaries and/or f) additives, wherein the polyether polyamines (b) used are polyoxyalkyle polyamines having a functionality of from 2 to 8 and a molecular weight of from 1,100 to 16,000, and the chain extenders (c) used are di- to tetrafunctional aliphatic and/or araliphatic polyols having a molecular weight of from 60 to 400, or mixtures of the said polyols and primary aromatic diamines, in amounts of from 5 to 150 parts by weight per 100 parts by weight of polyoxyalkylene polyamines (b), and the equivalency ratio of NCO groups of polyisocyanates (a) to the Zerewitinoff-active hydrogen atoms bonded to OH and NH2 groups of components (b) and (c) is 1 : 0.85-1.25.</p> |
