Patent · US Expired

Thermally stable polyester, process for its preparation and its use

US6841604B2 · kind B2 · utility

7Cited by

1References

32Claims

0Family size

Assignee

INVISTA TECHNOLOGIES S.A.R.L. · US

Inventors

Uwe BAYER · Gessertshausen, DE
Jürgen Popp · Jena, DE
Thomas Wehrmeister · Adelsheim, DE

Key dates

Filing date	Nov 15, 2002
Grant date	Jan 11, 2005
Priority date	—
Expiry date	Jan 24, 2023

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T442/60
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A polyester with a carbon black content of up to 20% by weight, based on the polyester, is condensed, after transesterification of DMT with diol, or after esterification of terephthalic acid with diol, with the aid of a titanium-based catalyst. The carbon black is added in the form of a carbon black dispersion together with the polycondensation catalyst to the transesterification product or esterification product. The carbon black dispersion comprises gas black or furnace black and a dispersing agent, and these are dispersed in diol. The diameter of the carbon black particles is below that of carbon black particles in a polyester using an antimony compound as catalyst.

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