| abstract |
Semipermeable porous membranes having an average pore diameternin the range 0.01-3 µm, and porosity in the range 30%-90%,nbased on semi-crystalline fluoropolymers and the respectivenpreparation process, wherein the semi-crystalline fluoropolymersncomprise:n (a) from 10 to 70% by moles of ethylene, (b) from 30 to 90% by moles of a fluorinated monomer selectednfrom tetrafluoroethylene, chlorotrifluoroethylene, ornmixtures thereof, (c) from 0.1 to 30% by moles, with respect to the totalnamount of monomers (a) and (b), of a hydrogenated monomernof formula:n CH 2 =CH-(CH 2 ) n -R 1 nwherein R 1 = -OR 2 , or -(O) t CO(O) p R 2 wherein t and pnare integers equal to 0.1 and R 2 is a linear ornbranched C 1 -C 20 alkyl, or a cycloalkyl, optionallyncontaining heteroatoms and/or chlorine atoms, preferablynheteroatoms are O or N; R 2 can optionally containnone or more functional groups, preferably selectednfrom OH, COOH, epoxy, ester and ether group; R 2 ncan optionally contain double bonds, or it can be H;nn is an integer in the range 0-10. |