| 摘要 |
<p>Prepn. of aromatic cpds. substd. by at least two isocyanate gps., where at least one cpd. (A) (comprising at least two prim. amine functions and at least one aromatic residue) is contacted with phosgene - in the vapour phase, using a 0-100% (pref. 5-60) excess of phosgene relative to the number of moles of functional amine gps.. Pref. the cpd. (A) comprises at least two amine functions and at least one 6-14C (more pref. 6-10C) aromatic residue opt. substd. by one or more hydrocarbyl radicals chosen from 1-10C (more pref. 1-6C) alkyl, aryl, alkyl-aryl or aryl-alkyl. The cpd. corresps. to the formula H2N-R-NH2 (I); where R = aromatic gp. (opt. substd.) as described above. More specifically, A is chosen from toluene diamine, xylylene-diamine and phenylene-diamine (singly or mixed) with or without isomers.</p> |
