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Title:
METHOD FOR PRODUCING POLYAMINE BASED ON DIPHENYLMETHANE AND POLYISOCYANATE
Document Type and Number:
Japanese Patent JP2004059920
Kind Code:
A
Abstract:

To provide an industrially simple and secure method for producing polyisocyanate based on diphenylmethane, with low color valency.

The method for production of diphenylmethane based polyamine comprising a step (a) reacting aniline and formaldehyde in the presence of an acid catalyst to form the polyamine, (b) neutralizing the reaction mixture by a base, the neutralization process is carried out in the presence of one or more alcohols, and the mole ratio of the alcohol and formaldehyde is ≥ 0.02:1.


Inventors:
HAGEN TORSTEN
KAEMPER FRIEDHELM
KOCH DANIEL
MUELLER HEINZ-HERBERT
Application Number:
JP2003183065A
Publication Date:
February 26, 2004
Filing Date:
June 26, 2003
Export Citation:
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Assignee:
BAYER AG
International Classes:
C07C209/78; C07C211/43; C07C263/10; C07C265/14; C08G73/02; C08G12/08; C08G18/76; C08G73/06; C07C211/50; C07C265/12; (IPC1-7): C08G12/08; C07C209/78; C07C211/43; C07C263/10; C07C265/14
Attorney, Agent or Firm:
Toshio Yano
Toshiomi Yamazaki
Takuya Kuno
Einzel Felix-Reinhard
Reinhard Einsel