Polyethercarbonate-polyoxymethylene block copolymers

US9790328B2 · kind B2 · utility

Assignee

• Covestro Deutschland AG · DE

Inventors

• Thomas Mueller · Leonberg, DE
• Christoph Guertler · Cologne, DE
• Walter Leitner · Aachen, DE
• Henning Vogt · Aachen, DE
• Gabor Barath · Aachen, DE
• Mario Krautschick · Bergheim, DE

Key dates

• Filing date: Jun 10, 2014
• Grant date: Oct 17, 2017
• Expiry date: Aug 22, 2034

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2110/0025
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The present invention relates to a method for producing polyethercarbonate-polyoxymethylene block copolymers, comprising the step of polymerizing formaldehyde, wherein formaldehyde is polymerized in the presence of a polyethercarbonate having at least one Zerewitinoff-active H atom, obtaining an intermediate product. The obtained intermediate product can be further reacted with a cyclic carboxylic acid ester or carbonic acid ester, a cyclic anhydride, an epoxide, and/or an isocyanate, wherein a hydroxyl- or carboxy-functional or NCO-modified polyethercarbonate-polyoxymethylene block copolymer is obtained. The present invention further relates to polyethercarbonate-polyoxymethylene block copolymers that can be obtained by means of such a method and to the use of same to produce polyurethane polymers.