A web of continuous filaments which are made of at least one semi-crystalline polymeric component covalently bonded as a linear block copolymer with or blended with one or more semi-crystalline or amorphous polymeric components. The filaments are intermingled together to form a porous web of filaments,...http://www.google.co.uk/patents/US6165217?utm_source=gb-gplus-sharePatent US6165217 - Self-cohering, continuous filament non-woven webs
