Process for the production of methylene-crosslinked polyphenylen

Details Process for the production of methylene-crosslinked polyphenylen Process for the production of methylene-crosslinked polyphenylen

1993-06-22

1994-11-15

Acquah, Samuel A.

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

Organic compounds

Isocyanate esters

528230, 528232, 528266, 528269, 560347, 560352, 560358, C07C26304

Patent

active

053649583

ABSTRACT:
The hue of a methylene-crosslinked polyphenylene polyisocyanate continuously produced by the reaction with phosgene in an inert solvent of a polyamine mixture obtained by condensation of aniline and formaldehyde in the presence of an acid catalyst is improved by first removing any residual phosgene followed by heat treatment in the presence of hydrogen chloride gas.

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patent: 3857871 (1974-12-01), Hatfield, Jr. et al.
patent: 4193932 (1980-03-01), Yamamoto et al.
patent: 4774357 (1988-09-01), Keggenhoff et al.
patent: 5179227 (1993-01-01), Ishida et al.

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