Biodegradable material comprising regenerative raw material...

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 7/00 (2006.01) C08L 1/02 (2006.01) C08L 3/02 (2006.01) C08L 21/00 (2006.01) C08L 67/04 (2006.01)

Patent

CA 2197981

The invention concerns a biodegradable material comprising a matrix of latex, starch and polybetahydroxybutyrate and/or cellulose powder. This basic matrix can contain vegetable fillers, such as granulates of cereal grains or fibres of fibrous plants, for forming composite materials. The invention further concerns a method of preparing a biodegradable material, said method being characterized in that all the starting materials and the rubber in particular are in the comminuted form. These comminuted, for example, substantially granulated starting materials are mixed and plasticized in a screw-type extruder or in an injection moulding machine. The plasticized mass can be injected directly into a mould or extruded in the form of a strand which is processed to form granulates to be used as injection moulding material.

L'invention concerne un matériau biodégradable renfermant une matrice en latex, de l'amidon et du polybétahydroxybutyrate et/ou de la poudre de cellulose. Des charges végétales, telles que des granulés formés à partir de grains de céréales, ou des fibres de plantes fibreuses, peuvent être introduites dans cette matrice de base en vue de former des matériaux composites. L'invention concerne en outre un procédé de fabrication d'un matériau biodégradable, caractérisé en ce que tous les matériaux de départ, et en particulier le caoutchouc, se présentent sous forme broyée. Ces matériaux broyés, sensiblement granulés, sont mélangés et plastifiés dans une extrudeuse à vis ou dans une machine à mouler par injection. La masse plastifiée peut être injectée directement dans un moule ou extrudée en un jonc qui est transformé en granulés utilisés comme matériau pour le moulage par injection.

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