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US 5,856,572 AGranted
Organic soluble wholly aromatic polyamides and preparation of the same
AssigneeIndustrial Technology Research Institute
InventorsGuey-Sheng Liou, Sheng-Huei Hsiao, Jen-Chang Yang
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Abstract
Disclosed is a wholly aromatic polyamide prepared by reacting 1,4-naphthyl or 2,6-naphthyl containing diacids with aromatic diamines. The polymers of the invention are readily soluble in a variety of organic solvents including DMAc, NMP and pyridine, and have good thermal stability. Transparent, tough and flexible films of these polymers can be cast from the solutions thereof and these polyamides are easily processable high-performance polymer materials.
Claims30
A wholly aromatic polyamide of the formula:
- ##STR8## wherein Ar.sub.1 is ##STR9## Ar.sub.2 is an aromatic group selected from the group consisting of the following:
- ##STR10## and n is an integer of 1-300.
A process for preparing a wholly aromatic polyamide of the formula:
- ##STR67## wherein Ar.sub.1 is ##STR68## and Ar.sub.2 is ##STR69## and n is an integer of 1 to 300, comprising reacting a diacid of formula (I) ##STR70## wherein Ar.sub.1 is defined as above and X is Cl, OH or OR wherein R is a C.sub.1 -C.sub.6 alkyl with an aromatic diamine of formula (III)
- H.sub.2 N--Ar.sub.2 --NH.sub.2 (III)
- wherein Ar.sub.2 is defined as above.
Dependencies are inferred from the claim text.