Patent · US Active

Continuous manufacture of poly(trimethylene terephthalate)

US7524921B2 · kind B2 · utility

1Cited by

11References

19Claims

0Family size

Assignee

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

Inventors

John Harvey Eng · Wilmington, US
Emily A. Blum · Winterville, US
Daniel Albert Green · Moylan, US
Carl J. Giardino · Soddy-Daisy, US
Gene Parrish · New Bern, US
Robert E. Trotter · Wilmington, US
Gary Wilson · Coventry, GB

Key dates

Filing date	Dec 14, 2006
Grant date	Apr 28, 2009
Priority date	—
Expiry date	Apr 26, 2027

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T29/49005
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

This invention relates to a continuous process for production of poly(trimethylene terephthalate), wherein gaseous 1,3-propanediol by-product resulting from the process is condensed in a condenser, the total amount of any trimethylene terephthalate cyclic dimer and poly(trimethylene terephthalate) in the condensed by-product 1,3-propanediol is adjusted, and a portion of the condensed by-product is recycled to the condenser while another portion is recycled back into the process.

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