Disclosed are improved polymer materials. Also disclosed are fine fiber materials that can be made from the improved polymeric materials in the form of microfiber and nanofiber structures. The microfiber and nanofiber structures can be used in a variety of useful applications including the formation...http://www.google.com.au/patents/US7316723?utm_source=gb-gplus-sharePatent US7316723 - Air filter with fine fiber and spun bonded media
