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US 5,310,861 AGranted
Drawable high tensile strength aramids
AssigneeE. I. Du Pont de Nemours and Company
InventorRobert S. Irwin
Life of this patent
Estimating the term…
Abstract
Aramids, which in the drawn state have high tensile strengths tensile elongations, and tensile moduli, are made from units derived from p-phenylenediamine, terephthalic acid, a substituted terephthalic acid, and 4,4'-bibenzoic acid or 2,6-naphthalene dicarboxylic acid. The aramids are useful for ropes and composites.
Claims14
A drawable aramid random copolymer, consisting essentially of repeat units of the formulas ##STR2## wherein each R.sup.1 is independently hydrogen, chloro, bromo, or nitro, provided that one or two of R.sup.1 are chloro, bromo or nitro, and that at least one of R.sup.1 is hydrogen;
- and further provided that the molar ratio of I to II plus IIIa or IIIb is about 75:25 to about 90:10, and the molar ratio of II to IIIa or IIIb is about 90:10 to about 10:90.
Dependencies are inferred from the claim text.