A solution of elastomeric polyurethane in a volatile solvent is centrifugally sprayed onto a base in a strong electrostatic field to form long fibers that are swept across the base and deposited thereon in generally straight condition, overlapping and adhered to previously deposited fibers. Novel fibrous...http://www.google.es/patents/US4223101?utm_source=gb-gplus-sharePatente US4223101 - Method of producing fibrous structure
