Basf Aktiengesellschaft

Manfred Barl

Gert Buerger

Georg Pilz

Gerhard Thiel

Rolf Hartmuth Fischer

Hardo Siegel

Matthias Marx

Karsten Eller

Christoph Sigwart

Rolf Wurmb

Eugen Gehrer

Dieter Degner

Thomas Narbeshuber

Heinrich Horacek

A process for preparing halogen-free, reactive polyisobutene having a terminal double bond content of more than 50 mol % and an average molecular weight M of 280-10000 dalton by the cationic polymerization in the liquid phase of isobutene or hydrocarbon mixtures comprising isobutene comprises polymerizing at from &minus;30&deg; C. to &plus;40&deg; C. in the presence of a heterogeneous polymerisation catalyst comprising one or more oxides of the elements of transition groups V and VI of the Periodic Table of the Elements or in the presence of a heterogeneous polymerization catalyst comprising one or more oxidic compounds of one or more elements of transition groups V and VI of the Periodic Table of the Elements supported on a non-zeolitic oxidic support material which is not an oxygen-containing zirconium compound, the catalyst not containing a technically effective amount of halogen.

Method for producing halogen-free reactive polyisobutene

A process for the preparation of salts of dicarboxylic acids and diamines of the formula

Process for the preparation of salts of a dicarboxylic acid and a diamine

Salts of oxaalkylenediamines of the formula I

Salt of oxaalkylenediamine with dicarboxylic acid, containing hydrazine,

A process for making a polyurethane which comprises reacting an organic polyisocyanate with a higher molecular weight organic polyhydroxyl compound in the presence of a catalyst having the following formula: ##STR1## wherein X is sulfur or NH and n is a whole number from 2 to 6. Also used is a catalyst which is a combination of the above-mentioned catalyst and an organic tin compound.

Process for the manufacture of polyurethane foam

4-substituted benzaldehyde-dialkylacetals of the formula ##STR1## where R.sup.1 is one of the radicals CH.sub.2 .dbd.CH--CH.sub.2 --, ##STR2## R.sup.2 is alkyl and R.sup.3 and R.sup.4 are hydrogen or alkyl, and a process for the electrochemical preparation of these compounds.

4-Substituted benzaldehyde-dialkylacetal

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Otterstadt, Germany

Manfred Barl