Natural products composites

B - Operations – Transporting – 27 – K

Patent

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Details

B27K 3/52 (2006.01) B27N 3/00 (2006.01) B27N 3/28 (2006.01)

Patent

CA 2522969

Disclosed are natural products composites protected against the deleterious effects of microorganisms comprising at least one natural product, at least one thermoplastic resin, and an antifungal agent. The composites are further advantageously protected against weathering and color formation by the incorporation therein of at least one light stabilizer and at least one compound selected from the group consisting of the oxides, hydroxides or silicates of Ca, Mg, Al and Zn. The light stabilizers are selected from the group consisting of the ultraviolet light absorbers and the sterically hindered amines. The metal oxide is for example CaO. The natural products are for example wood flour, flax, hemp, jute, kenaf, or rice husk. The thermoplastic resin is for example polyethylene or polypropylene. The antifungal agent and potential coadditives are incorporated via melt processing such as extrusion, co-kneading, pultrusion and injection molding. The antifungal agent is for example thiabendazole.

La présente invention concerne des composites de produits naturels protégés contre les effets délétères des micro-organismes, qui comprennent au moins un produit naturel, au moins une résine thermoplastique et un agent antifongique. Les composites de l'invention sont en outre avantageusement protégés contre le vieillissement climatique et la coloration par l'incorporation dans ces derniers d'au moins un photostabilisant et d'au moins un composé choisi dans le groupe composé des oxydes, des hydroxydes ou des silicates de Ca, Mg, Al et Zn. Les photostabilisants sont choisis dans le groupe composé des agents absorbant les ultraviolets et des amines à encombrement stérique. L'oxyde métallique est, par exemple, le CaO. Les produits naturels sont, par exemple, la farine de bois, le lin, le chanvre, la jute, le kenaff ou la balle de riz. La résine thermoplastique est, par exemple, un polyéthylène ou un polypropylène. L'agent antifongique et les co-adjuvants potentiels sont incorporés par un traitement à l'état fondu tel que l'extrusion, le co-malaxage, l'extrusion par étirage et le moulage par injection. L'agent antifongique est, par exemple, le thiabendazole.

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