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US 5,175,236 AGranted
Tough, high strength fibers of copolyesters prepared from isophthalic acid; 4,4'-oxydibenzoic acid; and hydroquinone diacetate
AssigneeE. I. Du Pont de Nemours and Company
InventorRobert S. Irwin
Life of this patent
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Abstract
Tough, high strength fibers of copolyesters from hydroquinone, isophthalic acid and 4,4'-oxydibenzoic acid in defined proportions.
Claims1
High tenacity, high toughness fibers of a copolyester comprising the following repeat units:
- ##STR5## where unit I is present in the range of from about 60 to 80 mol percent and unit II is present in the range of from about 20 to 40 mol percent.
Dependencies are inferred from the claim text.