Abstract: A process for producing hoses of laminated construction having a plastic inner tube is disclosed which comprises:- (a) extruding a thermoplastic resin on a mandrel to form an inner tube with a predetermined thickness, the mandrel being preformed of a thermoplastic resin or rubber and releasable from the inner tube, (b) laminating an outer tube integrally on the inner tube by extrusion of an unvulcanized rubber to form an integral hose body, (c) vulcanizing the hose body, (d) removing the mandrel from the vulcanized hose body. This hose is characterized by high resistance to load of impulse.

Abstract: A process for manufacturing a thermoplastic polymer container having a triple-wall structure is provided in which the outer and inner laminates are composed of an olefin polymer and the medial laminate is composed of polyamide. The medial polyamide laminate is characterized as containing, incorporated therein, 3 to 45% by weight of an ethylene copolymer containing 0.1 to 10% by mole, in polymerized form, of at least one metal salt of acrylic or methacrylic acid, and having a thickness of 2 to 30% by weight based on the total thickness of the three laminates. The container is manufactured by extruding the polymer melts while the three independent streams of the polymer melts to be formed into the three laminates are joined together within a die such that the thickness of said medial laminate is 2 to 30%, based on the total thickness of the three laminates, and then blow-molding the extruded composite polymer tube into the shape of a container.