Basf Aktiengesellschaft

Basf Se Corporation

Basf Corporation

Karl Ott

Heinz Berbner

Rolf Pinkos

George M Kent

Hans D Zettler

Hans-Dieter Eichhorn

Tobias Wabnitz

Thomas Vogler

Gernot Herbst

Karl Haeberle

Otto M Ilg

Dominick A Burlone

Helmut Schmidtke

Manfred Dargatz

Maria Teresa Hechavarria Fonseca

Ralph Versch

Ronald Drews

Stephanie Mollner

Gerd Buelow

&Auml;gidius Eckel

Juan Salgado-Valle

William Theuer

Katja Lamm

Silke Simon

Process for purifying N-alkylpyrrolidones which due to a previous use comprise at least one of the impurities of the formula I or II where R is hydrogen or a C1-C20-alkyl group,wherein

Process for purifying N-alkylpyrrolidones

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

Process for the continuous preparation of N-ethyl-2-pyrrolidone (NEP) by reacting gamma-butyrolactone (GBL) with monoethylamine (MEA) in the liquid phase, wherein GBL and MEA are used in a molar ratio in the range from 1:1.08 to 1:2 an the reaction is carried out at a temperature in the range from 320 to 420&#xb0; C. and an absolute pressure in the range from 70 to 120 bar.

Process for continuously preparing N-ethyl-2-pyrrolidone (NEP)

Use of melamine resin fibers and insulating materials based on melamine resin fibers and polyalkylene terephthalate fibers

The present invention relates to flameproof fabrics based on melarnine resin fibres, fireproof blankets and clothing made therewith and their use for extinguishing fires and protecting people and objects from fire, combustion products and/or extinguishing agents.

Flameproof fabrics based on melamine resin fibres

Fabrics containing melamine fibers are rendered more comfortable by carding the melamine fibers under vacuum so as to exhibit a narrower fiber diameter distribution (.delta..sub.d) and/or a narrower staple length distribution (.delta..sub.1) as compared to melamine fibers which are carded in the absence of vacuum. In addition, more comfortable melamine fiber-containing yarns are produced by spinning the staple fiber at a lower twist multiplier (TM) as compared to conventional melamine fiber yarns. Most preferably, the melamine fiber-containing fabrics and yarns will be blended with at least one other type of synthetic fibers, such as aramid fibers.

Melamine fiber-containing fabrics with improved comfort

Fabrics containing melamine fibers are rendered more comfortable by carding the melamine fibers under vacuum so as to exhibit a narrower fiber diameter distribution (.delta..sub.d) and/or a narrower staple length distribution (.delta..sub.l) as compared to melamine fibers which are carded in the absence of vacuum. In addition, more comfortable melamine fiber-containing yarns are produced by spinning the staple fiber at a lower twist multiplier (TM) as compared to conventional melamine fiber yarns. Most preferably, the melamine fiber-containing fabrics and yarns will be blended with at least one other type of synthetic fibers, such as aramid fibers.

Metal coated melamine resin fiber and natural fiber mixture

Melamine-containing fabrics with improved comfort

Fiber blend

A thermally stable electrical insulating material comprises melamine resin fibers and a polymer fibril binder with or without a synthetic resin powder and mineral fillers.

Electrical insulating paper

Growing community of inventors

Plankstadt, Germany

Karl Ott