Flexible tube coated with layer having diffusion barrier effect to gases and aromas

Abstract

A flexible tube designed to store and dispense liquid-to-pasty products containing fragrances, aromas or [substances] sensitive to oxidation, whose wall bears over its entire surface a coating comprising a layer of thickness comprised between 150 and 1500 Å of a material or a mixture of materials belonging to the following group: hydrogenated or non-hydrogenated, nitrogenated or non-nitrogenated amorphous carbon, oxides, nitrides or carbides or their mixture or their combination with one or more of the following metals (Si, Mg, Al, Ti, Zr, Nb, Ta, Mo, W, V). Preferably, this is an internal coating. The coating is created by means of a plasma, preferably under atmospheric pressure, by decomposition of a gaseous compound and condensation on the substrate or even by means of a plasma ribbon. The coating can be mixed or gradual: for example, carbon with polymeric tendency in the sublayer and silica on the surface.

Dependencies are inferred from the claim text.