Patent · US Active

Poly(trimethylene therephthalate) continuous manufacturing process

US7504474B2 · kind B2 · utility

0Cited by

10References

15Claims

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
Gene Parrish · New Bern, US
Robert E. Trotter · Wilmington, US
Gary Wilson · Coventry, GB

Key dates

Filing date	Dec 14, 2006
Grant date	Mar 17, 2009
Priority date	—
Expiry date	Feb 16, 2027

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/2931
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, and a portion of the condensed by-product is recycled to the condenser while anther portion is recycled back into the process.

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