Cassella Aktiengesellschaft

Dresser Industries, Inc.

Steffen Piesch

Peter Dorries

Friedrich Engelhardt

Alfons Wolf

Herbert Wille

Hans Honel

Walter Michel

Wolf Weidemuller

Jeffery C Dawson

Karin Schluter

Ulrich Riegel

Rudi Beyerle

Piero A Martorana

Karl Hintermeier

Juliane Balzer

Manfred Schon

Wilhelm Adam

Manfred Seidel

Heinz Bender

Artur Meyer

Richard Hensel

Renate Konrad

Curt A Wagner

Georg W Eckhardt

Wolfgang Spieler

Gunther Wulff

Thomas Gotze

Ewald Schmidt

Juliane Balzar

Sulphonamide compounds of the formula ##STR1## are prepared by condensation of sulphonamides of the formula

Sulphonamide derivatives and their preparation and use

Modified aminoplast, its preparation and its use

The present invention relates to macromolecular compositions crosslinked by a novel bridge having the formula --NR.sup.x --CH.dbd.N--CO--. This novel bridge is obtained by reacting a macro-molecule, preferably a polymer, having at least two amidocarbonyl groups with a compound having at least two formylamido groups in an aqueous medium under highly acidic conditions. The crosslinking bridge formed by the reaction of this invention is produced in accord with the following formula: ##STR1## Compositions containing macromolecules having at least two amidocarbonyl groups and a compound having at least two formylamido groups can act as viscosifying or gelling agents for aqueous acids where when added to aqueous acids, crosslinking occurs. Acids gelled in this manner have important use in the recovery of oil and natural gas from subterranean formations.

Cross-linkable and cross linked macromolecular compositions wherein

Water soluble, crosslinkable polymer compositions, their preparation and

Diethanolammonium sulphamate is a curing agent for modified aminoplast resins.

Diethanolamine salt of sulphamic acid as a curing accelerator for

A bonded structure of textile materials bonded by a melamine-formaldehyde precondensate is produced by applying to a textile material a melamine-formaldehyde precondensate with a molar ratio of melamine to formaldehyde of 1:(0.8 to 1.26) to form a composite and then compressing the composite with an overpressure of 1 to 200 bars at temperature of from 130.degree. to 220.degree. C.

Bonded structures of textile materials

Melamine resins, a process for their preparation and their use and

Low viscosity, aqueous impregnating resin solution with improved stability containing 30-70% by weight of solid resin which comprises:

Acrylate-modified melamine resin which is stable on storage, its

Carbazoleazomethines are prepared and sulfur dyestuffs are prepared by sulphurizing a carbazoleazomethine of the formula ##STR1## wherein R.sup.1 is hydrogen, hydroxyl, halogen, nitro, alkyl having 1 to 8 carbon atoms, alkoxy having 1 to 8 carbon atoms, dialkylamino having 1 to 4 carbon atoms per alkyl, alkanoyloxy having 1 to 8 carbon atoms, benzoyloxy, alkanoylamino having 1 to 8 carbon atoms or benzoylamino;

Sulphur dyestuffs of the carbazole series

Partially etherified melamine-formaldehyde resins having a melamine:formaldehyde molar ratio of 1:(1.25 to 1) can be prepared by a condensation reaction under neutral or weakly alkaline conditions if the condensation reaction is carried out in the presence of a glycol monoether of the general formula I

Melamine resins: process for their manufacture and the compression

The process for the preparation of a 3-(4-hydroxyanilino)carbazole of the formula ##STR1## wherein R is hydrogen, alkyl having 1 to 8 carbon atoms or halogenoalkyl having 1 to 8 carbon atoms, comprising reacting a 3-aminocarbazole of the formula ##STR2## with p-hydroquinone or p-aminophenol or a mixture of p-hydroquinone and p-aminophenol in at least stoichiometric amounts by heating to a temperature of 150.degree. to 300.degree. C. with exclusion of oxygen.

Process for the preparation of derivatives of

Partially etherified melamine-formaldehyde resins having a melamine: formaldehyde molar ratio of 1:(1.25 to 1) can be prepared by a condensation reaction under neutral or weakly alkaline conditions if the condensation reaction is carried out in the presence of a glycol monoether of the general formula I

A latent curing agent for aminoplast resins produced by reacting diethanolamine with glycidol in a molar ratio of 1:(1 to 1.2) at 0.degree. to 90.degree. C. and then reacting the product with 0.5 to 1 mole of sulfur dioxide per mole of diethanolamine at 0.degree. to 90.degree. C.

Latent curing agent for thermosetting aminoplast resins, its manufacture

The present invention relates to new, pharmacologically-valuable antidepressants, which are 2,4,5,6-tetrahydro-1H-pyrazino-[3,2,1-jk]-carbazoles substituted in the 8-position and having the formula I ##STR1## wherein R stands for an alkyl or alkoxy group having 1 to 4 carbon atoms or a fluorine, chlorine or bromine atom, and a method for making them by reacting with ammonia a 6,9-disubstituted 1,2,3,4-tetrahydrocarbazol-1-one of the formula II ##STR2## wherein X denotes a bromine, chlorine or iodine atom or a radical of the formula --O--SO.sub.2 --R', and R' is an alkyl radical having 1 to 3 carbon atoms, phenyl or tolyl.

Pyrazino-carbazoles, process for the production thereof and

A melamine-formaldehyde resin useful for making coated wood-based materials and laminates and having a prolonged pot life comprises (a) melamine-formaldehyde precondensation product wherein the molar ratio of melamine:formaldehyde is 1:1.4 to 1:2.6 and (b) 0.1 to 1.0% by weight based on total solids, of an amine of the formula ##STR1## wherein R.sup.1 and R.sup.2 are each identical or different alkyl having 1 to 4 carbon atoms and R.sup.3 is 2-hydroxyethyl, 2-(2-hydroxyethoxy)-ethyl, 3-hydroxy-1-propyl, 3-hydroxy-2-propyl, 2,3-dihydroxypropyl or

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Oberursel, Germany

Steffen Piesch