Basf Aktiengesellschaft

Dietrich Wolff

Peter Horn

Peter Zehner

Leopold Hupfer

Ludwig Schuster

Rolf Wurmb

Wolfgang Seydl

Georg Falkenstein

Klaus Bittins

Ulrich Eiden

Manfred Herr

Wilhelm Haarde

Hanns-Helge Stechl

Richard Palm

Aromatic nitro compounds in waste waters from nitrobenzene production plants are degraded by treatment with ozone at 60-100&deg; C. 1.5-10 bar and pH 3 to 12.

Cleanup of nitroaromatics-containing wastewaters

Preparation of methyl formate by the reaction of carbon monoxide and methanol under conditions of elevated pressure and temperature in the presence of an alkali metal methylate, in which

Preparation of methyl formate

Thermoplastic molding compositions based on polybutylene terephthalate having a relative viscosity of from 1.3 to 2.0, as measured in a phenol/o-dichlorobenzene mixture at 25.degree. C, and which contain, to increase the thermo-aging stability and toughness and also to improve the processing stability, from 0.1 to 10% by weight, based on the polybutylene terephthalate, of isocyanates or isothiocyanates and/or carbodiimides and/or compounds forming isocyanate groups or isothiocyanate groups and/or carbodiimide groups.

Tough polybutylene terephthalate molding compositions showing good

Stable, liquid, homogeneous solutions of isocyanurate-polyisocyanates containing amide and/or acylurea groups in monomeric diisocyanates and/or polyisocyanates which are free from amide, acylurea and/or isocyanurate groups, are obtained by reacting polybasic carboxylic acids with diisocyanates and/or polyisocyanates to give diisocyanates and/or polyisocyanates containing amide groups and/or acylurea groups, converting the diisocyanates and/or polyisocyanates containing amide and/or acylurea groups by trimerization and, optionally, polymerization, into isocyanurate-polyisocyanates containing amide and/or acylurea groups, and mixing the products with monomeric diisocyanates and/or polyisocyanates.

Stable, liquid solutions of isocyanurate-polyisocyanates containing

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Plankstadt, Germany

Dietrich Wolff