Membran med osmotiska egenskaper, sätt för framställning samt användning till vattenrening

摘要

A semipermeable membrane having osmotic properties is comprised of a microcrackled polymer film as a base membrane having a semipermeable surface layer applied thereto. The surface layer is comprised of a polymer of one or more polyethylene glycol-monoacrylates and/or -diacrylates of the general formula: CH2 = CH - CO - O - [-CH2 - CH2 - 0 -]n - R, in which R is hydrogen or -CO - CH = CH2, and n has a value such that the acrylates will obtain a mean molecular weight within the range of 100-1000. The surface layer polymer shall include at least one polyethelene glycol diacrylate, wherein R is -CO - CH = CH2. The membrane is used in a reverse osmosis water purifying process.