Patent · US Active

Polytrimethylene ether glycol or copolymers thereof having improved color and processes for their preparation

US8598391B2 · kind B2 · utility

0Cited by

11References

8Claims

0Family size

Assignee

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

Inventors

Aaron Minter · Wilmington, US
Edward R. Murphy · Issaquah, US
Howard Ng · Kingston, CA
Rupert Spence · Calgary, CA
Tuyu Xie · Kingston, CA

Key dates

Filing date	Sep 29, 2010
Grant date	Dec 3, 2013
Priority date	—
Expiry date	Sep 11, 2031

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G65/34
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Processes for reducing the color of polytrimethylene ether glycol or copolymers thereof are provided. The processes include polycondensing diols in the presence of an acid catalyst and adding base continuously over a period of the polycondensation reaction. The invention also relates to the polytrimethylene ether glycol thereof produced by these processes.

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