Barrier coatings for oil and grease resistance

B - Operations – Transporting – 32 – B

Patent

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Details

B32B 27/10 (2006.01) B32B 27/20 (2006.01)

Patent

CA 2467284

A multi layer composite having oil and grease resistance comprising: a) a paper or paperboard substrate, b) a base coat on a surface of said substrate comprising a first polymer selected from the group consisting of film forming natural and synthetic polymers in the substantial absence of a mineral pigment filler, and c) a top coat on a surface of said base coat, said top coat comprising a continuous polymer phase comprising one or more film forming synthetic polymers having dispersed therein at least one platy mineral pigment and at least one non-platy mineral pigment. This invention also relates to a method of making the composite and articles of manufacture fabricated totally or in part from the composite of this invention where oil and grease resistance is required or desired, such as container, bags and wraps for packaging oily or greasy materials such as animal and human food.

Divulgation d'un composite multicouche résistant à l'huile et à la graisse et comprenant : a) un substrat en papier ou en carton; b) un revêtement de base sur la surface dudit substrate comprenant un premier polymère choisi parmi le groupe constitué des polymères synthétiques et naturels filmogènes en l'absence presque totale d'une matière de charge pigmentée minérale; c) un revêtement à la surface dudit revêtement de base, ce revêtement comprenant une phase polymère continue renfermant un ou plusieurs polymères synthétiques filmogènes dans lesquels sont dispersés au moins un pigment minéral lamellaire et au moins un pigment minérale non lamellaire. La présente invention a aussi pour objet une méthode de production de ce composite et d'articles manufacturés totalement ou en partie à partir de ce composite pour lesquels une résistance à l'huile ou à la graisse est requise ou désirée, comme des contenants, des sacs et des emballages pour matières huileuses ou graisseuses telles que des aliments pour les animaux ou les humains.

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