Fully aromatic copolyamide from 4,4'-diamino benzanilide

Details Fully aromatic copolyamide from 4,4'-diamino benzanilide Fully aromatic copolyamide from 4,4'-diamino benzanilide

1990-10-23

1992-03-17

Anderson, Harold D.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

521189, 528125, 528128, 528183, 528184, 528185, 528321, C08G 6932, C08G 6936

Patent

active

050970151

ABSTRACT:
Aromatic copolyamides are described which are soluble in organic polyamide solvents and contain at least 95 mol % of repeating structural units of the formulae ##STR1## and up to 5 mol % of structural units E and/or F containing m-bonds and being derived from aromatic dicarboxylic acids (E') and/or aromatic diamines (F'), the sums of the molar proportions of structural units A+E and the molar proportions of structural units B+C+D+F being essentially the same. In these formulae, --Ar-- is a divalent aromatic radical whose valence bonds are in the para or comparable coaxial or parallel position, --R is hydrogen, lower alkyl radicals, lower alkoxy radicals or halogen, and R' is a direct bond, a polymethylene chain of 2 to 6 carbon atoms, --O--, --S--, --CO-- or --SO.sub.2 --, or a group of the formula --O--Ar'--O--, in which Ar' has the same meanings as Ar. The proportions of the diamine structural units B, C and D, relative to the total amount of these diamine structural units, are within the following limits:

REFERENCES:
patent: 4511709 (1985-04-01), Yoon et al.
patent: 4987215 (1991-01-01), Keil et al.
patent: 4987216 (1991-01-01), Keil et al.

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