Patent · US Active

Process for preparing polyesters by using an additive

US11254785B2 · kind B2 · utility

0Cited by

6References

16Claims

0Family size

Assignee

Technip Zimmer GMBH · DE

Inventors

Holger Bachmann · Weiterstadt, DE
Rainer Linke · Gummersbach, DE
Eckhard Seidel · Frankfurt, DE
Michael Reisen · Frankfurt am Main, DE
Reza Sarbandi · Frankfurt am Main, DE

Key dates

Filing date	Jul 6, 2017
Grant date	Feb 22, 2022
Priority date	—
Expiry date	Aug 20, 2037

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G63/912
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A process for reducing the amount of hydroxyl-end-groups of a polyester, wherein the polyester is prepared from at least one dicarboxylic acid and at least one dihydroxy alcohol, and at least one additive selected from the group consisting of carboxylic acid anhydride and mono-isocyanate, and wherein the additive is added during a step of prepolycondensation and/or during a step of polycondensation and/or after a step of polycondensation.

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