Ticona Gmbh

Karl-Friedrich Mück

Michael Hoffmockel

Klaus Kurz

Matthias Göring

Juergen Lingnau

Dirk Zierer

Jürgen Lingnau

Robert M Gronner

Horst Röschert

Michael G Yearwood

Ernst Hofmann

Jens Schiebisch

Satyajit Verma

Holger Schmalz

The invention relates to a process for preparation of polymer blends comprising at least one polyoxymethylene and at least one thermoplastic elastomer, where the thermoplastic elastomer is micropelletized by a pelletizing process and the pellets obtained in a) are dispersed in the polyoxymethylene matrix via melting of the components and mixing of these at low shear forces, and also to the use of micropelletized thermoplastic elastomers for preparation of polyoxymethylenes with low formaldehyde emission.

Process for preparation of polymer blends composed of polyoxymethylenes and of thermoplastic elastomers

Multiblock copolymers are described and contain the structural unit of formula I-A-O&#x2014;R&#x2014;O&#x2014;CO&#x2014;(R&#x2014;CO&#x2014;)&#x2014;X-D-X&#x2014;(CO&#x2014;R)&#x2014;CO&#x2014;X&#x2014;&#x2003;&#x2003;(I),

Polyoxymethylene multi-block copolymers, their production and use

A process for preparing acetals from aldehydes and alcohols is carried out by generating a reaction/distillation zone charged with an acidic fixed bed catalyst in a distillation column, feeding the aldehyde and the alcohol to the reaction/distillatlon zone and at least partly converting them to the acetal, heating the column bottom disposed below the reaction/distillation zone in order to at least partly evaporate the bottom's mixture and to establish a defined temperature in the reaction/distillation zone, feeding an extractant into a rectifying section of the column, disposed above the reaction/distillation zone and condensing a product having more than 90% by weight of acetal at the top of the column.

Processes for the manufacture of acetals

Process for removing methanol from formaldehyde-containing solutions. The present invention relates to a process for removing methanol from formaldehyde-containing solutions, with methanol being converted into formaldehyde dimethyl acetal by reactive distillation in the presence of an acidic fixed-bed catalyst, and the resultant mixture comprising methanol, formaldehyde dimethyl acetal and possibly other impurities being distilled off.

Process for removing methanol from formaldehyde-containing solutions

A process for the preparation of polyoxymethylene copolymers, wherein 1,3,5-trioxane is polymerized with generally known comonomers in the presence of a strong protonic acid initiator and in the presence of a formaldehyde dialkyl acetal, and wherein the initiator is dissolved in the formaldehyde dialkyl acetal before admixing to the trioxane and the comonomers.

Process for the preparation of thermally stable polyoxymethylene copolymers

Copolymers are described containing blocks of the structural repeat units of the formula I and blocks containing structural units of the formula II[&#x2014;O&#x2014;CH&#x2014;],&#x2003;&#x2003;(I)[&#x2014;O&#x2014;R&#x2014;],&#x2003;&#x2003;(II)where Ris a divalent radical derived from a hydroxy-terminated aliphatic or cycloaliphatic oligomer or polymer which, where appropriate, has ether groups and/or carbonyloxy groups in the chain, and x is a whole number, at least 10. The copolymers may be used for producing moldings.

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Wiesbaden, Germany

Karl-Friedrich Mück