Polymer composition and a method for producing packing...

C - Chemistry – Metallurgy – 08 – L

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C08L 29/04 (2006.01) B65D 65/46 (2006.01) C08J 7/12 (2006.01) C08L 31/04 (2006.01) C08L 1/28 (2006.01)

Patent

CA 2470306

The polymer composition is used for packing products of the chemical, food and other industries. The packing material obtained from the polymer composition has a wide range of application and controllable decomposition of the packages in water medium, ensuring environmental cleanness and recycling of the material.The polymer composition for packing materials contains polyvinylalcohol and water, and, according to the invention, it also contains polyvinylacetate dispersion, methylcellulose, carboxymethylcellulose and glucose in the following proportions of the components in % by weight: polyvinylalcohol 32 - 84, polyvinylacetate dispersion 10- 57, methylcellulose 3.0 - 5.8, carboxymethylcellulose 2.0 - 4.2, glucose 0.5 - 2.3, and water 0.5 - 6Ø The method for producing packing materials from the polymer composition includes the preparation of a dry mixture or viscous mass and moulding. According to the invention, before or after the moulding the material is treated successively with aqueous sodium tetraborate solution and aqueous formaldehyde solution.

L'invention concerne une composition polymère s'utilisant pour emballer des produits chimiques et alimentaires, entre autres. La matière d'emballage obtenue à partir de cette composition polymère présente une large gamme d'applications, ne nuit pas à l'environnement grâce à la décomposition réglée des emballages en milieu aqueux et peut être recyclée. Cette composition polymère d'emballage contient comme composants de l'alcool polyvinylique et de l'eau, et, selon l'invention, une dispersion d'acétate de polyvinyle, de la méthylcellulose, de la carboxyméthylcellulose et du glucose dans les proportions suivantes, en % en poids : alcool polyvinylique 32 84, dispersion d'acétate de polyvinyle 10 57, méthylcellulose 3,0 5,8, carboxyméthylcellulose 2,0 4,2, glucose 0,5 2,3, et de l'eau 0,5 6,0. Le procédé de préparation de matières d'emballage à partir de cette composition polymère comporte les étapes consistant à préparer un mélange sec ou une masse visqueuse et à le/la mouler. Selon l'invention, avant ou après moulage, la matière est traitée successivement à l'aide d'une solution aqueuse de tétraborate de sodium et d'une solution aqueuse de formaldéhyde.

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