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US 5,710,237 AGranted
Liquid crystalline polyester resin
AssigneeE. I. Du Pont de Nemours and Company
InventorsMarion Glen Waggoner, Michael Robert Samuels
Life of this patent
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Abstract
Liquid crystalline polyesters made from hydroquinone, terephthalic acid, 2,6-naphthalene dicarboxylic acid and 4-hydroxybenzoic acid, and having a selected composition range, have melting points of about 350.degree. C. or less, good physical properties, and are readily manufactured. The polymers are useful as molding resins.
Claims1
A liquid crystalline polyester consisting essentially of repeat units of the formulas:
- ##STR2## wherein:
- repeat unit (I) constitutes 53 to 63 mole percent of said repeat units;
- repeat unit (II) constitutes 18.5 to 25 mole percent of said repeat units;
- repeat units (IIIa) plus (IIIb) constitute 18.5 to 25 mole percent of said repeat units;
- the molar ratio of (IIIa):(IIIb) is 35:65 to 45:55;
- and
- the molar ratio of (II) to (IIIa)+(IIIb)! is about 1.0.
4 more elements
Dependencies are inferred from the claim text.