Polymeric multi-layer substrates

B - Operations – Transporting – 32 – B

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Details

B32B 27/08 (2006.01) B32B 7/10 (2006.01) B32B 27/30 (2006.01) B32B 27/36 (2006.01)

Patent

CA 2741478

Biodegradable polymeric multi-layer substrates in which the tie layer or layers comprise a mixture of at least the polymers forming the substrates on either side of the tie layer wherein the grades of said polymers are selected such that their melt flow indices and their melt viscosities are similar requiring the grade of at least one polymer within the tie layer to be different from the grade of the same polymer(s) comprising one or other substrate adjacent the tie layer. The inclusion of higher melting point polymers in one outer substrate allows the multi-layer substrate to be subsequently peeled from the article to which it has been sealed.

L'invention porte sur des substrats multicouche polymères biodégradables, dans lesquels la ou les couches de liaison comprennent un mélange constitué d'au moins les polymères formant les substrats de chaque côté de la couche de liaison, les qualités desdits polymères étant choisies de telle sorte que leurs indices de fluidité à chaud et leurs viscosités à l'état fondu soient similaires, ceci nécessitant que la qualité d'au moins un polymère à l'intérieur de la couche de liaison soit différente de la qualité du ou des mêmes polymères constituant l'un ou l'autre substrat adjacent à la couche de liaison. L'inclusion de polymères à point de fusion plus élevé dans un substrat externe permet au substrat multicouche d'être ensuite arraché de l'article sur lequel il a été scellé de manière étanche.

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