Method for the manufacture of polyarylamines having methylene br

Details Method for the manufacture of polyarylamines having methylene br Method for the manufacture of polyarylamines having methylene br

1979-09-04

1981-10-27

Shaver, Paul F.

Organic compounds -- part of the class 532-570 series

Organic compounds

Amino nitrogen containing

564334, C07C 8728

Patent

active

042975115

ABSTRACT:
Through condensation ortho- and para-isomers of methylene dianiline (MDA) as well as PMPPA are produced as condensation products from arylamines, especially from aniline, and formaldehyde in the presence of acid catalysts, in which at least one component is a perfluoro-carbonic acid. From this mixture of the condensation products, 4,4'-MDA (p-isomer) of high purity is obtained by crystallization while the homogeneous aqueous solution obtained is being cooled down. It has been discovered that the 4,4'-MDA salts of the perfluoro-carbonic acids are less soluble in water than the corresponding salts of the o-isomers and the PMPPA.

REFERENCES:
patent: 3931320 (1976-01-01), Eifler et al.
patent: 3954867 (1976-05-01), Funk et al.
patent: 3996283 (1976-12-01), Knofel
patent: 4025557 (1977-05-01), Eifler et al.
patent: 4061678 (1977-12-01), Knofel et al.
patent: 4087459 (1978-02-01), Knofel et al.
patent: 4130588 (1978-12-01), Martin et al.

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