Basf Se Corporation

Tobias Wabnitz

Rolf Pinkos

Stephan Hatscher

Karl Ott

Stefan Käshammer

Michael Hesse

Karl Haeberle

Jochen Steiner

Daniel Breuninger

Rene Backes

Manfred Dargatz

Jens Heimann

Maria Teresa Hechavarria Fonseca

Olivier Abillard

Katja Lamm

Ralf Stolle

Robert Laubner

Ricardo Ferre Gimenez

Juan Salgado-Valle

Gerd Buelow

Gerd-Dieter Dr Tebben

The present invention relates to a mixture comprising itaconic acid or an itaconic acid derivative and a primary amine of the formula (I)R&#x2014;NH&#x2003;&#x2003;(I)where the molar ratio of primary amine to itaconic acid or the itaconic acid derivative is in the range from 0.5:1 to 20:1, wherein the mixture comprises 50 mole percent or less of 4-carboxypyrrolidones of the formula (II), derivatives of the 4-carboxypyrrolidones of the formula (II) and 4-carbamidopyrrolidones of the formula (III) based on the itaconic acid used or the itaconic acid derivative used and in which R is a linear or branched saturated aliphatic radical having 1 to 24 carbon atoms or a saturated cycloaliphatic radical having 3 to 24 carbon atoms. The invention further provides for the use of the inventive mixtures for preparing 1,3-alkylmethylpyrrolidones and/or 1,4-alkylmethylpyrrolidones, and also a process for preparing 1,3-alkylmethylpyrrolidones and/or 1,4-alkylmethylpyrrolidones. In addition, the present invention relates to mixtures comprising 1,3-alkylmethylpyrrolidones and/or 1,4-alkylmethylpyrrolidones and 1,3-alkylmethylpyrrolidines, where the proportion of 1,3-alkylmethylpyrrolidines is in the range from 10 to 10 000 ppm, and to mixtures comprising 1,3-alkylmethylpyrrolidone and 1,4-alkylmethylpyrrolidone, wherein the molar ratio of 1,3-alkylmethylpyrrolidone to 1,4-alkylmethylpyrrolidone is in the range from 1:1 to 10:1.

Mixtures of itaconic acid or itaconic acid derivatives and primary amines for producing 1,3- and 1,4-alkyl methyl pyrrolidones

The present invention relates to substituted N-(cyclo)alkylpyrrolidones as solvents for use in processes for preparing polyurethane dispersions.

Solvents in the preparation of polyuretherane dispersions

The present invention provides a process for preparing 2-methyltetrahydrofuran by one-stage hydrogenation of furfural with a hydrogen-comprising gas in the presence of a structured bed of at least one copper catalyst and at least one catalyst which comprises at least one noble metal from groups 8, 9 and/or 10 of the periodic table of the elements applied on a support material.

Process for one-stage preparation of 2-methyltetrahydrofuran from furfural over two catalysts in a structured bed

The present invention provides a process for changing the given mean molecular weight Min the continuous preparation of polytetrahydrofuran or tetrahydrofuran copolymers, the mono- or diesters of polytetrahydrofuran or of tetrahydrofuran copolymers by polymerizing tetrahydrofuran in the presence of a telogen and/or of a comonomer over an acidic catalyst, wherein

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The present invention relates to a process for preparing polytetrahydrofuran or tetrahydrofuran copolymers by polymerization of tetrahydrofuran in the presence of a telogen and/or a comonomer over a fixed bed of an acid catalyst, in which the temperature of the polymerization mixture increases in the direction of flow through the catalyst bed.

Method for the production of polytetrahydrofurane or tetrahydrofurane copolymers

The present invention provides a process for depolymerizing mixtures comprising mono- and/or diesters of polytetrahydrofuran in the presence of an acidic catalyst and of a C- to C-alcohol at temperatures of from 80 to 200&#xb0; C. and a pressure of from 0.05 to 0.5 MPa, where the molar ratio of the C- to C-alcohol relative to the carboxyl groups present in the mixture is greater than 1.

Method for the depolymerization of mixtures that contain mono-and/or diesters of polytetrahydrofurane

The present invention provides a catalyst comprising a mixture of at least one acid-activated sheet silicate with a transition metal oxide of groups 8 and/or 9 of the Periodic Table of the Elements and also a process for preparing polytetrahydrofuran, polytetrahydrofuran copolymers, diesters or monoesters of these polymers, in which tetrahydrofuran is polymerized in the presence of at least one telogen and/or comonomer over such a catalyst.

Catalyst and process for the polymerization of cyclic ethers

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Mannheim, Germany

Tobias Wabnitz