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US 4,232,144 AGranted
Polyester which exhibits anisotropy in the melt containing p-oxybenzoyl units and 4-oxy-3'-carbonylbenzophenone units or methyl and chloro derivatives of said units
AssigneeE. I. Du Pont de Nemours and Company
InventorRobert S. Irwin
Life of this patent
Estimating the term…
Abstract
Fiber-forming aromatic polyester consisting essentially of p-oxybenzoyl units or the 3-methyl or 3-chloro derivatives thereof, 4-oxy-3'-carboxybenzophenone units or the 3-methyl or 3-chloro derivatives thereof, 1,4-dioxyphenylene and terephthaloyl units.
Claims16
Fiber-forming copolyesters consisting essentially of Units I, II, III and IV having the structural formulas:
- ##STR2## where X and R are independently hydrogen, methyl- or chloro-, in the proportions of about 56-70 mol % of Unit I, about 10-20 mol % of Unit II, from 7 to about 12 mol % of Unit III and an amount of Unit IV equivalent on a molar basis to Unit III.
Dependencies are inferred from the claim text.