Semipermeable composite membrane and a method for the preparation of such a membrane
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United States of America Patent
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Nov 10, 1998
Grant Date -
N/A
app pub date -
Dec 17, 1996
filing date -
Dec 21, 1995
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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. The invention also relates to a method for the preparation of such a semipermeable composite membrane.
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