Thermoplasticized starch component and process for the...

C - Chemistry – Metallurgy – 08 – L

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C08L 3/04 (2006.01) A61K 47/36 (2006.01) C05G 3/00 (2006.01) C08B 31/00 (2006.01) C08G 18/10 (2006.01) C08G 18/40 (2006.01) C08G 18/64 (2006.01) C08G 81/00 (2006.01) C08L 3/00 (2006.01) C08L 67/04 (2006.01) C09D 103/04 (2006.01) C09J 103/04 (2006.01)

Patent

CA 2226579

The invention relates to a process for thermoplastisizing starch, a melt- processible polymer composition, which contains a starch-based component and a thermoplastisized polymer component, and a method for preparing such a composition. According to the invention the starch component, which contains hydroxyl groups capable of reacting with isocyanate groups, is modified so that it can be dissolved or gelatinized/plastisized in the melt of a hydroxy acid polymer. The starch component is then reacted with a thermoplastic component formed by a hydroxy acid polymer, in particular a lactic acid polymer, in order to produce a melt-processible, biologically degradable starch-based polymer, which can be used as an adhesive and for coating of paper and cardboard products and for preparation of injection moulded and thermoformed articles.

L'invention concerne un procédé pour rendre un amidon thermoplastique, une composition polymère se prêtant à une transformation à l'état fondu, contenant un composé à base d'amidon et un composé polymère rendu thermoplastique, ainsi qu'un procédé pour préparer une telle composition. Selon l'invention, l'amidon, qui contient des groupes hydroxyle capables de réagir avec des groupes isocyanate, est modifié pour pouvoir se dissoudre ou être gélatinisé/plastifié dans la masse fondue d'un polymère d'un acide hydroxylé. L'amidon réagit ensuite avec un composant thermoplastique constitué par un polymère d'un acide hydroxylé, en particulier un polymère de l'acide lactique, pour fournir un polymère à base d'amidon qui est biodégradable et qui se prête à une transformation à l'état fondu, pouvant servir d'adhésif et destiné au couchage du papier et du carton et à la fabrication d'articles moulés par injection et thermoformés.

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