| abstract |
The invention relates to a membrane construction comprising multiple layers wherein at least one of the layers is a nanoweb made of polymeric nanofibers, wherein the mean flow pore size of the nanoweb is in the range from 50 nm to 5 μ m, wherein the number average diameter of the nanofibers is in the range from 100 to 600 nm, wherein the basis weight of the nanoweb is in the range from 1 to 20 g/m<SP>2</SP>, wherein the porosity of the nanoweb is in the range from 60 to 95%, wherein at least one of the layers is a support layer and wherein the nanoweb is hydrophilic. |