# US 5,710,237 A · Liquid crystalline polyester resin

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- Number: US 5,710,237 A
- Document ID: US5710237A
- Status: Granted
- Kind: A
- Application number: 08/436,990
- Filed: 1995-05-08
- Granted: 1998-01-20
- Earliest claimed: 1994-09-06
- Assignees: E. I. Du Pont de Nemours and Company
- Inventors: Marion Glen Waggoner; Michael Robert Samuels
- Web page: https://patentgrep.com/patent/US5710237A

## CPC

- C08G 63/605: {the hydroxy and carboxylic groups being bound to aromatic rings}
- C09K 19/3809: {Polyesters; Polyester derivatives, e.g. polyamides}
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE

## 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.

## Claims

### Claim 1

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.