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US 5,969,081 AGranted
Cyclic oligomers comprising m-phenylene isophthalamide and polymers thereof
AssigneeE. I. Du Pont de Nemours and Company
InventorsYoung Hwan Kim, Wesley Memeger, Jr.
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Abstract
Disclosed herein are cyclic oligomers comprising substituted or unsubstituted m-phenylene isophthalamide, complexes of these oligomers with selected metal salts, novel methods for their preparation, and polymerization of the cyclic oligomers to linear aramids. The aramids are useful, for example, as fibers for fire resistant clothing. Amino-functional cyclic oligomers may be reacted with polyfunctional acyl halides to produce polyamides.
Claims2
A polymer, which is a reaction product of a compound of the formula ##STR6## with a compound of the formula
- R.sup.13 (COX).sub.2 (V)
- wherein each R.sup.7, R.sup.8, R.sup.9, R.sup.10, R.sup.11, and R.sup.12 is independently amino or hydrogen;
- R.sup.13 is hydrocarbylene, X is halogen, provided that:
- a total of at least two of R.sup.7, R.sup.8, R.sup.9, R.sup.10, R.sup.11, and R.sup.12 are amino;
- the molar ratio of (V):(IV) is at least about 1:1;
- and
- the molar ratio of (V):(IV) is such that number of equivalents of COX groups in the reaction does not substantially exceed the number of amino groups.
4 more elements
Dependencies are inferred from the claim text.