Patent · US Active

Manufacture of aromatic polyester

US7592413B2 · kind B2 · utility

12Cited by

11References

9Claims

0Family size

Assignee

E.I. DU PONT DE NEMOURS AND COMPANY · US

Inventors

Joel David Citron · Wilmington, US
David Neil Marks · Wilmington, US
Marion Glen Waggoner · Hockessin, US

Key dates

Filing date	Sep 8, 2006
Grant date	Sep 22, 2009
Priority date	—
Expiry date	Feb 2, 2027

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G63/19
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

Aromatic polyesters are made in a continuous process in an extruder or extruder-like apparatus by reacting at elevated temperatures dicarboxylic acids, aliphatic esters of aromatic diols, and optionally aliphatic esters of aromatic hydroxyacids in an extruder while removing byproduct aliphatic carboxylic acid. The resulting aromatic polyesters, especially thermotropic liquid crystalline aromatic polyesters, are useful as molding resins for a variety of uses, for example electronic and electrical parts.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.