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A method of surface treating a polyamide or polyester substrate, used in producing multilayer structures for packaging, with a cold plasma created by an electrical discharge on a nitrogen based gas at atmospheric pressure
A method of surface treating a polyamide or polyester substrate, used in producing multilayer structures for packaging, with a cold plasma created by an electrical discharge on a nitrogen based gas at atmospheric pressure
A method of surface treating a polyamide or polyester substrate in which its surface is submitted to a cold plasma created by the action of an electric discharge on a nitrogen based plasmagenic gas, with an oxygen content below 50 ppm at atmospheric pressure so as to graft on nitrated functional groups, especially amines. The grafted nitrogen atoms represent 0.5-10% and more preferably 1.5-4% of the surface carbon, oxygen and nitrogen compositions as measured by Electron Spectroscopy for Chemical Analysis (ESCA) (X Ray Photoelectron Spectroscopy (XPS)) at 75[deg] and 2-60% of the grafted nitrogen atoms are in the form of an amine group. After treatment the surface energy of the substrate is above 60 mN/m The plasmagenic gas contains 200-2000 and preferably 200-1000 ppm of hydrogen and oxidant dopants such as CO2 and N2O at less than 2000 ppm and preferably less than 1000 ppm. The discharge power is 10-60 W.min/m2 for a substrate speed of 300 m/minute. Independent claims are included for (1) A polyester or polyamide substrate obtained by use of the method; (2) a method of producing a multilayer substrate comprising a layer of polyolefin directly and intimately bonded to a layer of polyester or polyamide treated by the claimed method and assembled by pressing a polyolefin sheet or film against the treated surface of the polyester or polyamide at 150-340[deg]C; (3) a method of producing such as multilayer substrate by extrusion of a melted polyolefin at 200-340[deg]C and lamination onto the treated surface .
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