A tufted carpet comprises consecutively a primary backing, stitched with loops of yarn to form a tufted structure projecting outwardly from the primary backing, a polyolefin locking layer, a moisture barrier polyolefin layer, and a secondary backing comprising a woven polyolefin. ...http://www.google.fr/patents/US5800898?utm_source=gb-gplus-shareBrevet US5800898 - Tufted carpet and process for preparing same
