Basf Aktiengesellschaft

Hoechst Aktiengesellschaft

Ju/ Rgen Koch

Wilhelm Vogt

Hermann Glaser

Karin Elbl-Weiser

Christian Fischer

G/u/ Nter Lenz

Polyimides are obtainable by reacting a dianhydride component with a diamine component, at least one diamine containing cycloaliphatic units, with the proviso that the dianhydride component is a mixture of different dianhydrides if the diamine component consists only of one diamine containing cycloaliphatic units and the diamine component is a mixture of different diamines if the dianhydride component consists of only one dianhydride.

Polyimides based on diamines containing cycloaliphatic units

The disclosure relates to a process for making catalytically active aluminosilicates from glasses by hydrothermal cristallization. The hydrothermal cristallization is more particularly effected in the presence of an aqueous solution of an inorganic alkali metal compound producing an alkaline reaction but in the absence of an amine. Useful alkali metal compounds comprise alkali metal carbonate, water glass, alkali metal hydroxide or alkali metal phosphate. The catalytically active aluminosilicates can be used for dehydrating alcohols, ethers and other oxygen-containing organic compounds with formation of hydrocarbons, or for isomerizing or alkylating hydrocarbons.

Process for making catalytically active aluminosilicates and their uses

Growing community of inventors

Neuhofen, Germany

Ju/ Rgen Koch