Patent · US Expired

Optimum dipropylene glycol content polytrimethylene terephthalate compositions

US6509438B2 · kind B2 · utility

3Cited by

8References

5Claims

0Family size

Assignee

SHELL OIL COMPNY · US

Inventors

Donald R. Kelsey · Brookshire, US
Betty Marrou Scardino · Katy, US
Kailash Dangayach · Houston, US
Houston Brown · Houston, US
Hans Reitz · Rosbach, DE
Eckhard Seidel · Frankfurt, DE
Fritz Wilhelm · Karben, DE

Key dates

Filing date	Apr 23, 2001
Grant date	Jan 21, 2003
Priority date	—
Expiry date	Apr 23, 2021

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G63/672
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

According to the invention, a polytrimethylene terephthalate is provided having 0.6 to less than 2 mole percent dipropylene glycol. Such compositions have a reduced tendency to generate acrolein when heated in air. These PTT polymer compositions exhibit improved and enhanced dyeability as compared to conventional PTT made by the DMT process and the TPA polycondensation/solid state polymerization processes.

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