Drawable high tensile strength aramids
AssigneeE. I. Du Pont de Nemours and Company
InventorRobert S. Irwin
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Abstract
Aramids, which in the drawn state have high tensile strengths tensile elongations, and tensile moduli, are made from units derived from selected 2,2'-disubstituted-4,4'-bibenzoic acids, 3,4'-oxydibenzoic acid or 3,4'-dicarboxybenzophenone, p-phenylenediamine, and optionally terephthalic acid. The aramids are useful for ropes and composites.
Claims16
A drawable aramid random copolymer, consisting essentially of, of up to about 10 mole percent of a first unit of the formula ##STR7## about 30 to about 70 mole percent of a second unit of the formula ##STR8## and about 70 to about 30 mole percent of a third unit of the formula ##STR9## wherein X.sup.1 and X.sup.2 are independently selected from the group consisting of chlorine, bromine, nitro and methyl.
Dependencies are inferred from the claim text.