Basf Se Corporation

Hannes Ferdinand Zipfel

Martin Ernst

Alexander Panchenko

Alexej Michailovski

Dieter Kolassa

Rainer Klopsch

Christian Eidamshaus

Ansgar Gereon Altenhoff

Joerg Pastre

Nedko Stefanov Drebov

Sylvia Von Krog

Alvaro Gordillo Bolonio

Matthaeus Kopczynski

Tamara Kuelzer

Gabriela Budemberg

Stefanov Nedko Drebov

Long Phan

The invention relates to a method for manufacturing a concentrate enriched in iron mineral content from an ore, which contains an iron mineral and silicate, by reverse flotation, which method comprises the step of (c) adding a compound of formula I wherein Ris C-Calkyl or alkenyl, which is linear or branched, Ris H, C-Calkyl, which is linear or branched, Ris —X—NH, H or C-Calkyl, which is linear or branched, and X is C-Calkylene, which is linear or branched, or a salt of a protonated compound of formula I and an anion, to a prepared aqueous pulp of the ore and optionally one or more flotation auxiliaries to obtain an aqueous mixture. Furthermore, a method for manufacturing a specific group of compounds of formula I, i.e. compounds of formula 1-X wherein Ris C-Calkyl, which is linear or branched, Ris H, Ris —X—NHand X is C-Calkylene, which is linear or branched, is disclosed.

Method for flotation of a silicate-containing iron ore with a cationic collector

Epoxy resin-based fibre matrix compositions contain alkyl substituted ethylene amines such as dimethyldiethylenetriamine (DMDETA, also dimethyl-1,4,7-triazaheptane), as a curing agent. These curing agents are characterized by a short curing time for a comparatively long processing time, and make it possible to obtain cured epoxy resins that exhibit low brittleness and high tensile strength and have a high glass transition temperature; as a result of which the fibre matrix composition is suitable particularly for use in pultrusion and winding processes.

Epoxy resin-based fibre matrix compositions containing alkyl-substituted ethylene amines

The present application relates to a method for preparing compounds of the formula I in which, in a first step, &#x3b3;-butyrolactone is reacted with diamines of the formula II to form bisamides of the formula Ill, with the amide function of the bisamides of the formula Ill then undergoing partial or complete catalytic hydrogenation in step II) to form bispyrrolidine compounds of the formula I.

Method for producing bispyrrolidine compounds

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Ludwigshafen, Germany

Hannes Ferdinand Zipfel