US Patent 8092566 - Polymeric nanofiber filtration media

http://www.freepatentsonline.com/8092566.html

This patent from DuPont teaches an alternative filter media for HVAC air filters based on polymer nanofibers which can improve the filtration efficiency and reduce the chance of health hazard from the more conventional microglass filters. Claim 1 reads:

1. A composite fabric comprising a web of electroblown polymeric nanofibers solvent-bonded to a first support web comprising fibers of larger average diameter than the nanofibers and spun from a material compatible with said nanofibers, in the absence of an adhesive between the webs and wherein the nanofibers are solvent-bonded to the support web by the processing solvent from which the polymeric nanofibers are blown and which is entrained in the nanofiber web.