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US 4,070,326 AGranted
Anisotropic sulfuric acid dopes of polyamide hydrazides
AssigneeE. I. Du Pont de Nemours and Company
InventorPaul Winthrop Morgan
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Abstract
This invention relates to novel film- and fiber-forming optically anisotropic polyamide-hydrazide solutions (dopes) which are prepared in a solvent system comprising concentrated sulfuric acid or a mixture thereof with fluorosulfonic acid.
Claims4
A novel optically anisotropic spinning solution of at least 5 percent by weight of a fiber- and film-forming polyamide-hydrazide consisting essentially of repeating units ##STR8## wherein the divalent radical --X-- in repeating units may be the same or different and is a bond or 1,4-phenylene;wherein Y is a hydrogen atom or a methyl or chloro radical;
- the B units and the total A and C units are present in substantially equimolar amounts;
- and the total of C and D units is from 15 to 50 mole percent based on the total of A, C and D units present in the polymer;
- in sulfuric acid of at least 99.5% but not greater than 102% concentration or in a mixture thereof with fluorosulfonic acid.
Dependencies are inferred from the claim text.