A fibrous, non-woven thermal insulation comprises synthetic polymeric resin microfibers, staple fibers and bonding fibers which are randomly oriented and randomly intermingled in a single layer. The microfibers comprise between 25% and 95% by weight virgin synthetic polymeric resin and between 5% and...http://www.google.co.uk/patents/US5437922?utm_source=gb-gplus-sharePatent US5437922 - Fibrous, non-woven polymeric insulation
