Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From reactant having at least one -n=c=x group as well as...
Patent
1989-02-07
1990-05-08
Welsh, Maurice J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From reactant having at least one -n=c=x group as well as...
528 52, 528 53, 528 57, G08G 1822
Patent
active
049239511
ABSTRACT:
An aromatic polyamide is produced by subjecting an aromatic diisocyanate and an aromatic dicarboxylic acid to polycondensation in the presence of an alkali metal compound and/or an alkaline earth metal compound as a catalyst in an aprotonic polar solvent. The aromatic polyamide can be rendered suitable for use in the production of high-tenacity fibers by charging in advance the solvent, aromatic dicarboxylic acid and catalyst in a mixing system, reducing the water content in the mixing system to at least 50 ppm and then introducing the aromatic diisocyanate to conduct the polycondensation.
Kobayashi Tadashi
Matsuno Hiroaki
Obuchi Shouji
Takayanagi Hiroshi
Wada Mitsuo
Mitsui Toatsu Chemicals Incorporated
Welsh Maurice J.
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