Patent · US Active

NCO-modified polyoxymethylene block copolymers

US9534090B2 · kind B2 · utility

2Cited by

9References

6Claims

0Family size

Assignee

Covestro Deutschland AG · DE

Inventors

Thomas Ernst Müller · Aachen, DE
Christoph Gürtler · Cologne, DE
Walter Leitner · Aachen, DE
Henning Vogt · Aachen, DE
Gabor Barath · Aachen, DE

Key dates

Filing date	Dec 16, 2013
Grant date	Jan 3, 2017
Priority date	—
Expiry date	Dec 16, 2033

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G65/33348
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The invention relates to a method for producing NCO-modified polyoxymethylene block copolymers comprising the step of polymerizing formaldehyde in a reaction vessel in the presence of a catalyst, the polymerization of formaldehyde in addition taking place in the presence of a starter compound comprising at least 2 Zerewitinoff active H atoms to obtain an intermediate product. The intermediate product obtained is reacted further with an isocyanate to obtain an NCO-modified polyoxymethylene block copolymer. The invention also relates to NCO-modified polyoxymethylene block copolymers obtained by a method of this type and to the use of said copolymers for producing polyurethane polymers.

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