| 摘要 |
The present invention is directed to a process for the production of compact or cellular, elastomeric moldings having a compact skin based on polyurethane urea elastomers prepared from (a) organic polyisocyanates, (b) relatively high molecular weight polyhydroxyl or polyamino compounds containing at least two reactive hydrogen atoms, (c) diaminodiphenyl ureas as chain-extending agents and optionally, (d) catalysts, (e) small quantities of ethylene glycol, (f) other chain-extending agents and/or cross-linking agents, (g) blowing agents and (h) auxiliaries and/or additives, which is characterized in that the chain-extending agents (c) are diaminodiphenyl ureas corresponding to formula I <IMAGE> (I) wherein R1, R2, R3 and R4 may be the same or different and represent hydrogen or a C1-C6 alkyl radical and wherein the NH2 groups are in the m- and/or p-position to the urea group. The present invention is also directed to the RIM elastomers produced by this process. |
