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US 3,943,110 AGranted
Fiber and film-forming nuclearly-halogenated poly(1,4-benzamides)
AssigneeE. I. Du Pont de Nemours and Company
InventorPaul Winthrop Morgan
Life of this patent
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Abstract
Fiber and film-forming nuclearly-halogenated poly(1,4-benzamides) are prepared by thermal polymerization of nuclearly-halogenated aminobenzoyl halides and their hydrochlorides. The polymers can be dissolved and shaped into useful fibers and films that have low flammability.
Claims5
A polyamide consisting essentially of repeating units of the formula ##SPC2##
- wherein Y is halogen and n is an integer of from 1 to 4, the said polyamide having an inherent viscosity of at least 1.0, determined at 30.degree. C using 0.5 gm of polymer in 100 ml of conc. 95-98% sulfuric acid.
A process for preparing a polyamide consisting essentially of repeating units of the formula ##SPC3##
- wherein Y is halogen and n is an integer of from 1 to 4, the said polyamide having an inherent viscosity of at least 1.0 comprising heating a nuclearly-halogenated aminobenzoyl halide or its hydrochloride at a polymerization temperature of at least 100.degree. C in contact with a stream of inert gas whereby the gaseous hydrogen halide that is produced as a by-product is removed.
Dependencies are inferred from the claim text.