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AssigneeCovestro Deutschland AG
InventorsThomas Ernst Mueller, Christoph Guertler, Walter Leitner, Henning Vogt, Gabor Barath, Mario Krautschick
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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.
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.
Dependencies are inferred from the claim text.