Abstract: The invention relates to a semipermeable composite membrane comprising a microporous substrate provided with a semipermeable microporous substrate membrane which is provided, on at least one side, with a water-permeable polymer layer, said polymer layer containing the interfacial-polymerization product of an amine-terminal dendrimer and a compound polymerizing therewith. According to the invention, the amine-terminal dendrimers used, are poly(alkylene imine) dendrimers. These dendrimers preferably have terminal primary and/or secondary amine groups. In particular, use is made of a 1,4-diaminobutane ?4!: (1-azabutylidene).sup.x-4 : propylamine or propyl-N-alkyl-amine, wherein x=4, 8, 16, 32 or 64. Expediently, the compound which polymerizes with the dendrimer is selected from the group consisting of a carboxylic acid or carboxylic acid derivative, a sulphonic acid or sulphonic acid derivative, and an isocyanate compound.

Abstract: A membrane for membrane filtration is disclosed, comprising a polymer matrix formed by coagulation with a liquid coagulant from a casting syrup, which polymer matrix is linked to hydrophilic groups belonging to a compound which has a hydrophilic chain section, is not coagulated by the liquid coagulant, is coupled on either side to a hydrophobic chain, is anchored in the polymer matrix by non-chemical bonding, and is composed of a compound which has a molecular weight of at least 2000 and can be used as a thickening agent.

Abstract: Filament-like polymer crystal fibers are prepared from a solution of a crystallizable polymer, such as polyethylene or polypropylene, in a vessel containing a spinning rotor, preferably having a slightly roughened surface, according to the disclosed invention. The fiber thus formed is taken up and removed at a rate equal to the crystal growth rate. The longitudinal crystal growth rate is of sufficient speed for commercial application while at the same time yielding fibers of outstanding mechanical properties.