Patent · US Active

Process for the production of polyoxymethylene block copolymers

US10759902B2 · kind B2 · utility

0Cited by

24References

10Claims

0Family size

Assignee

Covestro Deutschland AG · DE

Inventors

Ilja Peckermann
Aurel Wolf · Wülfrath, DE
Jens Langanke · Mechernich, DE
Christoph Gürtler · Cologne, DE
Jörg Hofmann · Krefeld, DE

Key dates

Filing date	Sep 4, 2018
Grant date	Sep 1, 2020
Priority date	—
Expiry date	Jan 8, 2039

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC10M2217/045
WIPO fieldPharmaceuticals
WIPO sectorChemistry

Abstract

The invention relates to a process for producing polyoxymethylene block copolymers, comprising the step of activating the DMC catalyst in the presence of an OH-terminated polymeric formaldehyde starter compound by means of a defined amount of alkylene oxide, optionally followed by polymerization with alkylene oxides, if necessary in the presence of other comonomers. The invention further relates to polyoxymethylene block copolymers that can be obtained by means of such a process and to the use of these for producing polyurethane polymers.

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