C - Chemistry – Metallurgy – 09 – D
Patent
C - Chemistry, Metallurgy
09
D
C09D 129/04 (2006.01) B05D 7/04 (2006.01) C08J 3/09 (2006.01) C08J 7/04 (2006.01) C08J 7/06 (2006.01)
Patent
CA 2170862
A process for applying a barrier layer of ethylene/vinyl alcohol copolymer (EVOH) to a substrate, such as a plastic film, by coating the substrate with a solution of EVOH in a solvent of tetrahydrofuran and water, followed by removing the solvent and a coating solution is disclosed. Such coating solutions have lower viscosity than equally concentrated solutions of EVOH in alcohol-based solvents and have greater shelf lives than alcohol-based solutions. Multilayer structures having an EVOH barrier layer coated on a plastic substrate from solution in aqueous tetrahydrofuran solvent have excellent oxygen barrier properties.
Un procédé d'application d'une couche formant barrière en copolymère d'éthylène et d'alcool vinylique (EAV) sur un substrat tel qu'un film plastique consiste à enduire le substrat avec une solution d'EAV dans un solvant formée de tétrahydrofurane et d'eau, et à éliminer ensuite le solvant pour dégager une solution d'enduction. Ces solutions d'enduction ont une viscosité plus faible et se conservent plus longtemps que les solutions à concentration égale d'EAV dans des solvants à base d'alcool. Les structures multicouches portant une couche formant barrière en EAV, obtenue à partir de la solution dans le solvant aqueux au tétrahydrofurane, sur un substrat en plastique, présentent d'excellentes propriétés d'étanchéité à l'oxygène.
Dimock Stratton Llp
Dupont Teijin Films U.s. Limited Partnership
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