Improved barrier layer

C - Chemistry – Metallurgy – 08 – F

Patent

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Details

C08F 8/12 (2006.01) B32B 27/00 (2006.01) C09D 129/04 (2006.01) C09D 139/04 (2006.01)

Patent

CA 2737036

Disclosed herein is a barrier layer comprising a polyvinyl amine-polyvinyl alcohol copolymer applied to a substrate as a water-soluble composition, wherein the polyvinyl amine- polyvinyl alcohol copolymer is formed by copolymerizing: (a) from 99 to 1 mol% of N-vinylformamide and (b) from 1 to 99 mol% of one or more vinyl Ci-Ci0 alkyl esters, and then hydrolyzing from 30 to 100 mol% of the formyl groups from the copolymerized units (a) to form amino groups and from 30 to 100 mol% of the Cj-Cio alkyl ester groups from the copolymerized units (b) to form hydroxyl groups, wherein the copolymer has a unimodal compositional distribution as evidenced by essentially one peak in a gel permeation gradient elution chromatographic analysis. A method of producing a barrier layer is also disclosed.

La présente invention concerne une couche formant une barrière comprenant un copolymère amine polyvinylique-alcool polyvinylique appliquée sur un substrat sous forme de composition soluble dans l'eau, dans laquelle le copolymère amine polyvinylique-alcool polyvinylique est formé en copolymérisant : (a) de 99 à 1 % en moles de N-vinylformamide et (b) de 1 à 99 % en moles dun ou de plusieurs esters dalkyle en C1 à C10 vinyliques, et ensuite en hydrolysant de 30 à 100 % en moles des groupes formyles des unités copolymérisées (a) afin de former des groupes amino et de 30 à 100 % en moles des groupes esters dalkyle en C1 à C10 des unités copolymérisées (b) afin de former des groupes hydroxyles, le copolymère ayant une distribution compositionnelle unimodale comme le démontre la présence d'essentiellement un pic dans une analyse chromatographique dexclusion diffusion par élution avec gradients. L'invention concerne également un procédé de production dune couche formant une barrière.

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