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US 5,319,013 AGranted
Fiber and film of improved flame resistance containing mixed oxides of tungsten
AssigneeE. I. Du Pont de Nemours and Company
InventorsRobert V. Kasowski, Kiu-Seung Lee
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Abstract
Aramid and polybenzimidazole fibers and films of improved flame resistance are obtained by impregnation with tungsten hexachloride.
Claims6
Fiber or film of improved thermal stability comprising an aramid, containing at least 0.1% by weight of tungsten in the form of mixed oxides of tungsten based on the weight of the polymer.
Fiber of film of improved thermal stability comprising polybenzimidazole containing at least 0.1% by weight of tungsten, in the form of mixed oxides of tungsten, based on the weight of the polymer.
Dependencies are inferred from the claim text.