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US 4,359,569 AGranted
Aromatic polyester and filaments
AssigneeE. I. Du Pont de Nemours and Company
InventorRoger K. Siemionko
Life of this patent
Estimating the term…
Abstract
Fiber-forming aromatic polyester consisting essentially of 6-oxy-2-naphthoyl units, and units derived from certain dihydric phenols, and aromatic dicarboxylic acids.
Claims6
Melt-spinnable polyesters of fiber-forming molecular weight consisting essentially of units having the structural formulas:
- ##STR2## in the proportions of about 20 to 30 mol % of unit I, about 20 to 40 mol % of unit II, about 20 to 40 mol % of unit III and from 5 to about 20 mol % of units IV or V, the dioxy and dicarbonyl units being present in substantially equimolar amounts.
Dependencies are inferred from the claim text.