Filter material

摘要

A filter for use in flow-through devices has a layer (20) upon which is permanently bonded fine-structure layer (30) of electrostatically spun polymer fibers (40) of average diameter at most1mu, fibers (40) being bonded to each other directly via a catalyst or via a cross-linker such that the cross-linker and/or the crosslinked fibers are stable up to 200degreesC. An Independent claim is also included for production of the filter by spinning a melt or an (a)polar solution of a polymer in an electric field to give fibers (40) which are laid on layer (20) as a fine-structure layer (30) with spaces between fibers (40), a cross-linker having been added to the melt or solution and fibers (40) being catalytically crosslinked with each other or with the crosslinker.