Printable gas barriers

C - Chemistry – Metallurgy – 08 – J

Patent

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Details

C08J 7/04 (2006.01) C08K 5/10 (2006.01) C08L 29/04 (2006.01) C08L 33/00 (2006.01) C08L 39/00 (2006.01) C09D 129/04 (2006.01) C09D 139/00 (2006.01) B32B 27/08 (2006.01)

Patent

CA 2739669

A method is provided for enhancing the gas barrier properties of substrates such as materials used in packaging, by applying a composition comprising a vinyl alcohol / vinyl amide copolymer, a cross-linker and, optionally, a diacrylate or other polyacrylate and a photoinitiator to the material and curing the composition by irradiation with UV light, visible light, IR irradiation and/or electron beam or by exposure to heat. The method includes the optional step of subjecting the material to a low-temperature plasma discharge or a corona discharge prior to applying the composition. The method provides, for example, packaging materials, such as, flexible packaging materials such as plastic films producing packaging materials with excellent gas barrier properties which are readily printed upon.

L'invention porte sur un procédé pour l'augmentation des propriétés de barrière aux gaz de substrats tels que des matériaux utilisés en emballage, par application d'une composition comprenant un copolymère d'alcool vinylique/vinylamide, un agent de réticulation et, éventuellement, un diacrylate ou autre polyacrylate et un photo-initiateur sur le matériau et durcissement de la composition par irradiation par de la lumière UV, de la lumière visible, un rayonnement IR et/ou un faisceau d'électron ou par exposition à de la chaleur. Le procédé comprend l'étape facultative consistant à soumettre le matériau à une décharge de plasma à basse température ou une décharge par effet couronne avant l'application de la composition. Le procédé fournit, par exemple, des matériaux d'emballage, tels que des matériaux d'emballage souples tels que des films plastiques produisant des matériaux d'emballage ayant d'excellentes propriétés de barrière aux gaz sur lesquels on peut aisément imprimer.

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