Patent · US Active

Preparation of polytrimthylene ether glycol or copolymers thereof

US8148491B2 · kind B2 · utility

0Cited by

13References

20Claims

0Family size

Assignee

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

Inventors

David C. Confer · Chadds Ford, US
Mark Andrew Harmer · Kennett Square, US
Christian Hoffmann · Leonberg, DE
Scott Christopher Jackson · Wilmington, US
Sigridur Soley Kristjansdottir · Wilmington, US
Rupert Spence · Calgary, CA

Key dates

Filing date	Oct 31, 2008
Grant date	Apr 3, 2012
Priority date	—
Expiry date	Aug 7, 2030

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08L2205/05
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

This invention relates to a process for preparing polytrimethylene ether glycols or copolymers thereof by a polycondensation reaction using at least one acid catalyst, wherein the temperature of the reaction is controlled such that the average temperature during the first half of the reaction is higher than the average temperature during the second half of the reaction.

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