Akzo N.v.

Akzona Incorporated

Gerhard Meyer

Michael Diamantoglou

Anton Toth

Hans G Zengel

Helmut Magerlein

Hilde Kersten

Walter Brodowski

Jeffery D Lasher

Werner Klostermeier

Alexander Brandner

Hans Grothaus

Wolfgang Grimm

Gilles Dohy

Dieter Laudien

Jean P Vollmer

Gunter Sudheimer

Hans-Dieter Rupp

Aqueous ammonium thiocyanate solutions are prepared continuously by reaction of ammonia with carbon disulfide in the presence of water using activated carbon as catalyst at pressures of from 2 to 7 bar. In this way, a very pure product can be obtained. The process can be carried out at very low cost, because both the addition of ammonia to carbon disulfide and the decomposition of the resulting ammonium dithiocarbamate can be carried out in a reactor in one step under identical conditions.

Process for the preparation of aqueous ammonium thiocyanate solutions

Water-insoluble fibers of cellulose monoester of maleic acid, succinic acid, or phthalic acid having an extremely high absorption ability for water and physiological liquids are produced by (a) preparing at 20.degree. to 80.degree. C. a solution of activated cellulose in dimethylacetamide or 1-methyl-2-pyrrolidon containing 5 to 30% by weight activated cellulose of an average degree of polymerization from 300 to 800 and 3 to 20% by weight LiCl, (b) reacting the solution with a corresponding carboxylic acid anhydride in a mol ratio from 1:0.20 to 1:4 at 20.degree. to 120.degree. C. in the presence of known esterification catalyst until a degree of esterification from 0.1 to 1.7, (c) wet-spinning the cellulose monoester solution into a coagulation agent, with or without (d) converting the fibers of cellulose monoester of phthalic acid and, if necessary, the of cellulose monoester of maleic acid or succinic acid, in a substantially organic solvent by means of reaction with alkali metal hydroxide, alkali metal alcoholate, ammonia, primary or secondary amines, partially or completely into fiber-shaped salts.

Process for the production of water-insoluble fibers of cellulose

The invention relates to a hydrophilic moulding compound of homopolyester and/or copolyester which contains 1 to 20 percent by weight of an alkaline and/or alkaline-earth salt of salt-forming polymer and/or copolymers from ethylenic unsaturated monomers as finely dispersed filling material, having in particualr a maximum particle size of 1 um, the salt-forming polymers being composed in particular of the following single monomers or mixtures thereof: vinyl-sulfonic acid, acrylamidoalkylene-sulfonic acid, sulfonated styrene, acrylic acid, methacrylic acid, maleic acid, fumaric acid, itaconic acid, crotonic acid, vinyl-phosphonic acid, monoalkyl ester of maleic acid, monoalkyl ester of fumaric acid. The invention also relates to a process according to which the salts are preferably added to the polycondensation mixture of the polyester starting materials before and/or during poly-condensation as a suspension in polyhydric alcohol. The moulding compound is preferably used for making filament yarns, or staple fibers.

Hydrophilic polyester compounds

A process is provided for production of vicinal alkylene glycols by hydrolysis of an epoxyalkane having from 6 to 24 carbon atoms in the presence of water and a basic catalyst and under carbon dioxide pressures of from 100 to 300 bars and temperatures of from about 200.degree. C. to 350.degree. C. Also disclosed are homogeneous mixtures of epoxyalkanes and/or vicinal alkylene glycols having from 6 to 24 carbon atoms, water, a basic catalyst and carbon dioxide in an amount corresponding to a carbon dioxide partial pressure of from about 100 to 300 bars, provided at temperatures from about 200.degree. C. to 350.degree. C. The process provides high yields, selectivities and reaction velocities and the resulting products are of high purity.

Production of vicinal alkylene glycols

The invention refers to water-insoluble fibers of cellulose acetate cellulose propionate and cellulose butyrate with an extremely high absorptive capacity for water and physiological liquids and to a process for their preparation.

Water-insoluble fibers of cellulose acetate, cellulose propionate and

A laminate comprising an insoluble, intractable relatively thick layer of a polyimide bonded tightly onto a metallic substrate without the necessity for an intermediate adhesive bonding layer and a process for preparing such by directly extruding a polyamic acid polyimide-precursor onto said substrate and converting said polyamic acid to the polyimide in a single pass in at least two heating stages.

Thick polyimide-metal laminates with high peel strength

A catephoretically depositable aqueous coating composition is disclosed which is based on

Cataphoretically depositable aqueous coating composition, a method for

A process for the production of 3-hydrazino-4-amino-5-mercapto-1,2,4-triazole wherein hydrazinium-dithiocarbazinate is heated at moderately elevated temperature, e.g. about 50.degree. C. to 85.degree. C. and under reduced pressure, e.g. about 50 to 500 mm. Hg, with at least a 3.times. molar amount of hydrazine hydrate.

Process for producing 3-hydrazino-4-amino-5-mercapto-1,2,4-triazole

A process for the producing a polyamidocarboxylic acid, or so-called polyamic acid, which is the prepolymer in forming a polyamide and which requires the reaction of a tetracarboxylic acid dianhydride with a diprimary diamine below about 50.degree.C. in an anhydrous, polar, aprotic organic solvent, characterized by an initial treatment of the dianhydride by only wetting with an inert organic solvent or by at least wetting this dianhydride with the polar, aprotic solvent and thereafter adding to the wetted dianhydride a solution of the diamine in the polar, aprotic solvent under thorough mixing, preferably within a very short period of time after treating the dianhydride. Stable polyamic acid solutions formed in this manner are useful intermediates in preparing films, filaments or other shaped polyimide products.

Process for the production of polyamidocarboxylic acids

A process for the production of thiophosgene by the reduction of trichloromethanesulfenyl chloride with hydrogen sulfide at an elevated temperature and in contact with silica gel, the molar ratio of the hydrogen sulfide to trichloromethanesulfenyl chloride being from 1.5:1 to 4:1.

Process for the production of thiophosgene

In a process for reacting an aromatic or hydroaromatic alicyclic or heterocyclic dicarboxylic acid or its anhydride with an aliphatic or aromatic alicyclic or heterocyclic mono- or di-amine to produce an N-substituted dicarboxylic acid imide with a splitting off of water, the improvement of carrying out the reaction in a liquid solvent mixture consisting essentially of a non-polar organic solvent and a strongly polar organic solvent which together form a ternary azeotrope with water at reaction temperatures between about 40.degree.C. and 160.degree.C. The imide products are generally known for use as intermediates and final products in a number of industries.

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Obernburg, Germany

Gerhard Meyer