Polyethercarbonate-polyoxymethylene block copolymers

Patent metadata

Field	Value
Publication number	US-9790328-B2
Application number	US-201414895535-A
Country	US
Kind code	B2
Filing date	Jun 10, 2014
Priority date	Jun 13, 2013
Publication date	Oct 17, 2017
Grant date	Oct 17, 2017

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.

First claim

The invention claimed is:

1. A process for preparing polyethercarbonate-polyoxymethylene block copolymers, comprising polymerizing formaldehyde in the presence of a polyethercarbonate having at least one Zerewitinoff-active hydrogen atom, wherein the polymerizing is effected in the presence of one or more comonomers so that polyoxymethylene units are linked to the polyethercarbonates via one or more comonomers and/or polyoxymethylene units are linked to one another via one or more comonomers.

2. The process of claim 1 , wherein the formaldehyde is polymerized also in the presence of a catalyst.

3. The process of claim 1 wherein the formaldehyde is introduced into a reaction vessel as gaseous formaldehyde.

4. The process of claim 1 , wherein the polymerization of formaldehyde takes place in a reaction vessel and wherein the polyethercarbonate used to prepare the polyethercarbonate-polyoxymethylene block copolymers is prepared prior to the polymerization of the formaldehyde in the same reaction vessel in which the polymerization of formaldehyde takes place and without purification steps therebetween.

5. The process of claim 1 , wherein the polyethercarbonate used to prepare the polyethercarbonate-polyoxymethylene block copolymers is prepared from starting materials comprising an epoxide and carbon dioxide.

6. The process of claim 1 , wherein the one or more comonomers comprises a cyclic ether, a cyclic acetal, a cyclic ester, a cyclic acid anhydride, or a mixture of two or more thereof.

7. The process of claim 6 , wherein the one or more comonomers comprises an epoxide, a cyclic acetal, and/or a cyclic ester.

8. The process of claim 6 , wherein the one or more comonomers comprises ethylene oxide, propylene oxide, 1,3-dioxolane, 1,3-dioxepane, and/or ε-caprolactone.

Assignees

• Covestro Deutschland Ag

Inventors

• Mueller Thomas Ernst
• Guertler Christoph
• Leitner Walter
• Vogt Henning
• Barath Gabor
• Krautschick Mario

Classifications

• C08G2/38 Primary

  Block or graft polymers prepared by polymerisation of aldehydes or ketones on to macromolecular compounds · CPC title

• C08G18/14

  Manufacture of cellular products · CPC title

• C08G18/71

  Monoisocyanates or monoisothiocyanates · CPC title

• C08G64/183

  containing polyether sequences · CPC title

• C08J9/00

  Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof (mechanical aspects of shaping of plastics or substances in a plastic state for the production of porous or cellular articles B29C) · CPC title