Compostable backing foil

Details Compostable backing foil Compostable backing foil

B - Operations, Transporting

32

B

B32B 27/08 (2006.01) B29C 55/12 (2006.01) B32B 27/36 (2006.01)

Patent

CA 2262000

A compostable backing foil is composed of at least two layers and has a low tendency to curling and on one side gloss values lower than 10, measured according to DIN 67 530 at a 20~ angle. The outer layer of the foil, which has the lower gloss values, contains 1-80 % by weight of a uniformly distributed filler with a mean particle size < 22 µm. The individual layers of the polymer-resin layered structure contain as matrix materials polymers from the group composed of (I) aliphatic and partially aromatic polyesters; (II) aliphatic polyester urethanes; (III) aliphatic-aromatic polyester carbonates; (IV) aliphatic polyester amides.

L'invention concerne une feuille compostable constituée d'au moins deux couches. Cette feuille ne tend guère à s'enrouler et présente d'un côté des valeurs de brillance inférieures à 10, mesurées selon la norme DIN 67 530, à un angle de 20·. La couche extérieure de la feuille qui a les valeurs moindres de brillance contient 1 à 80 % d'une charge uniformément répartie et constituée de grains d'une grandeur moyenne inférieure à 22 µm. Les couches individuelles de la structure stratifiée de polymère et de résine contiennent comme matières matricielles des polymères du groupe constitué de: (I) les polyesters aliphatiques et partiellement aromatisés; (II) les uréthannes aliphatiques de polyester; (III) les carbonates aliphatiques-aromatisés de polyester; et (IV) les amides aliphatiques de polyester.

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