METHOD FOR PRODUCING DIPHENYLMETHANE-BASED DIAMINE AND POLYAMINE

Japanese Patent JP2007197449

A

To provide a new method accompanying a further wide improvement of color, although in the coloration of a mixture of formed diamine and polyamine and the coloration of a mixture of isocyanate and polyurethane produced therefrom, the improvement is achieved by changing each of process parameters e.g. the addition of components, concentration of acid catalyst, control of temperature or product composition in rearrangement.

The diphenylmethane-based diamine and polyamine are produced by the reaction of aniline with formaldehyde in the presence of an acid catalyst, wherein the used aniline contains <3 mass% diphenylmethane-based diamine and polyamine, advantageously by 0.001 to 3 mass%, especially advantageously by 0.01 to 1 mass% based on the mass of the used aniline.

COPYRIGHT: (C)2007,JPO&INPIT

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POHL FRITZ
BOLTON JEFFREY
ADAMSON RICHARD
MUELLER HEINZ-HERBERT
UCHDORF RUDOLF

JP2007018270A

August 09, 2007

January 29, 2007

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BAYER MATERIALSCIENCE AG

C07C209/78; C07C211/46

JPS63227609A	1988-09-21
JPH04154744A	1992-05-27
JP2003119235A	2003-04-23
JPS5277042A	1977-06-29
JPS63227609A	1988-09-21
JPH04154744A	1992-05-27

Toshio Yano
Toshiomi Yamazaki
Takuya Kuno
Hiroshi Sugimoto
Einzel Felix-Reinhard
Reinhard Einsel

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