Wholly aromatic polyamide from N,N'-bis (4-amino phenyl)-isophthalamide
AssigneeKorea Institute of Science and Technology
InventorsHan-Sik Yoon, Wha S. Lee, Tae W. Son, Chul J. Lee, Byung G. Min
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Abstract
New wholly aromatic polyamides are provided. This polymers are prepared by a mixture of N,N'-bis(4-aminophenyl)-isophthalamide and p-phenylenediamine in a tertiary amide solvent containing an alkali metal salt such as LiCl and a tertiary amine as an acid acceptor. The polymers are easily dry-jet spun to form a fiber and cast to form a film. The fiber and film so obtained have ultrahigh tenacity, elasticity and elongation.
Claims10
A wholly aromatic copolyamide polymer consisting essentially of recurring units of the formula:
- ##STR9## wherein x and y each represent the molar fraction of N,N'-bis(4-aminophenyl)isophthalamide and the molar fraction of p-phenylenediamine;
- provided that x is 0.12 to 0.9 and y is 0.88 to 0.1.
A process for the preparation of a wholly aromatic copolyamide polymer consisting essentially of recurring units of the formula:
- ##STR10## wherein x represents the molar fraction of N,N'-bis(4-aminophenyl)isophthalamide and is 0.12 to 0.9 and y represents the molar fraction of p-phenylenediamine and is 0.88 to 0.1, which process comprises:
- dissolving an alkali metal salt and a tertiary amine as an acid acceptor in a tertiary amide solvent;
- adding thereto a mixture of N,N'-bis(4-aminophenyl)isophthalamide of the formula:
- ##STR11## and p-phenylenediamine in a given proportion;
- adding terephthaloyl chloride to said mixture, and copolymerizing said mixture at low temperatures.
Dependencies are inferred from the claim text.