Basf Aktiengesellschaft

Gunter Eckert

Rolf Fikentscher

Herbert Stutz

Franz Schmidt

Erhard Klahr

Friedrich Reinert

Wolfgang Groh

Siegfried Schneider

Adolf Stuebinger

Jurgen Schmidt-Thummes

Hans Lutje

.beta.-N-aziridinopropionates of relatively high boiling alcohols or polyalcohols are prepared by transesterifying a .beta.-N-aziridinopropionate of a lower alcohol of 1 to 4 carbon atoms with a relatively high boiling alcohol or polyalcohol by a process in which the transesterification is carried out in the presence of, as a transesterification catalyst, a titanium(IV) or tin(IV) compound which is soluble in an organic medium.

Preparation of .beta.-N-aziridinopropionates

Leather is finished with a synthetic carboxylated rubber dispersion to which as much as 50% by weight of one or more oxides and/or hydroxides of divalent and/or trivalent metals may have been added, finishing being carried out by a process in which the carboxylated rubber dispersion is prepared by the emulsion feed method, with a conversion of more than 90%, in such a way that it contains from 20 to 60% by weight of carboxylated rubber which is soluble in dimethylformamide at room temperature.

Finishing leather with a synthetic carboxylated rubber dispersion

Aqueous dispersions of crosslinked polyurethane ionomers can be advantageously obtained by a method in which polyurethane prepolymers possessing salt groups and aliphatically and/or cycloaliphatically bonded terminal isocyanate groups, in a water-miscible organic solvent, are mixed with polyfunctional polyisocyanates, the resulting solution is dispersed in water and the organic solvent is evaporated off.

Preparation of crosslinked polyurethane ionomer dispersions

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Limburgerhof, Germany

Gunter Eckert