VERFAHREN ZUR HERSTELLUNG VON POLYISOCYANATEN DER DIPHENYLMETHANREIHE MIT VERMINDERTEM FARBWERT
摘要
<p>A method (M1) for the production of polyamines of the diphenylmethane series (I) involves: (a) reaction of aniline and formaldehyde in presence of an acid catalyst to form polyamines; and (b) neutralization of the reaction mixture with base, followed by phase separation and treatment of the organic phase with a base. An Independent claim is also included for a method (M2) for the production of polyisocyanates of the diphenylmethane series (II) by carrying out method M1 as above and then reacting the polyamines obtained with phosgene.</p>
申请公布号
AT312070(T)
申请公布日期
2005.12.15
申请号
AT20030004365T
申请日期
2003.03.03
申请人
发明人
HAGEN, TORSTEN, DR.;KAEMPER, FRIEDHELM, DR.;KOCH, DANIEL, DR.;UCHDORF, RUDOLF;WERSHOFEN, STEFAN, DR.