Heat-sealable films that are degradable for disposal

C - Chemistry – Metallurgy – 09 – J

Patent

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Details

C09J 7/02 (2006.01) A61L 2/26 (2006.01) A61L 11/00 (2006.01) A61L 15/42 (2006.01) A61L 15/58 (2006.01) A61L 15/62 (2006.01)

Patent

CA 2213255

The invention provides use of a heat sealable degradable sheet in disposable products which comprises: a substrate of degradable flexible sheet material; and a thermoplastic coating intermittently disposed on said substrate whereby a sharp non-bleeding pattern is created that does not migrate into the regions that should remain uncoated, whereby said substrate is accessible to degrading agents notwithstanding the presence of said coating, and said coating being so arranged on said substrate as to render said substrate heat sealable, said substrate being degradable by a mechanism from the group consisting of bio--degradability and hydrolyzability, wherein the disposable products are selected from the group consisting of sanitary napkins, tampons, diapers, surgical dressings and wound dressings. Films or sheets in accordance with this invention may be pervious or impervious components of disposable consumer and medical products, and as packaging materials for such products.

Cette invention concerne un procédé permettant de rendre thermoscellable un substrat se composant d'un film dégradable non thermoscellable en l'enduisant de manière discontinue d'une composition thermoplastique dégradable ou non. Le taux de dégradation voulu du substrat est défini d'après le système de traitement choisi du produit jetable utilisant ce film. La discontinuité de l'enduit permet d'exposer le substrat dégradable et de le rendre sujet à la dégradation par des micro-organismes ou par un milieu hydrolysant. Le mode de réalisation de cette invention consiste à enduire d'un revêtement thermoplastique discontinu dégradable ou non, l'un ou les deux côtés d'un film biodégradable ou sensible à un milieu hydrolysant. Ceci permet d'obtenir un film thermoscellable dont la capacité inhérente à se dégrader n'est pas remise en cause, et dont le taux de dégradation n'est pas altéré sur le plan physique. Les films produits d'après cette invention peuvent être utilisés en tant que composants perméables ou imperméables de produits médicaux ou de consommation jetables, par exemple en tant que matériaux d'emballage de ces produits.

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