The invention provides a composite protective coating applied to a steel pipe, the coating comprising an epoxy resin primer bonded to the outer surface of the pipe, a polyolefin outer sheath, and an interlayer consisting of a mixture of epoxy resin and polyolefin. The composition of the mixture forming...http://www.google.es/patents/US5300336?utm_source=gb-gplus-sharePatente US5300336 - High performance composite coating
