Biodegradable polymer

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 3/08 (2006.01) C08J 5/00 (2006.01) C08J 5/18 (2006.01) C08K 5/053 (2006.01) C08K 5/09 (2006.01) C08L 3/02 (2006.01) C08L 3/06 (2006.01) C08L 29/04 (2006.01)

Patent

CA 2354002

A biodegradable polymer is disclosed having the composition g) from 8 to 80 % by weight of a starch modified to include an hydroxyalkyl C2-6 group or modified by reaction with an anhydride of a dicarboxylic acid, preferably hydroxypropylated high amylose starch, a) from 0 to 87.9 % of starch, b) from 4 to 11 % by weight of a water soluble polymer selected from polyvinylacetate, polyvinyl alcohol and copolymers of ehtylene and vinylalcohol which have a melting point compatible with the molten state of the starch components, c) from 0 to 20 % by weight of a polyol plasticiser, preferably glycerol, d) from 0.1 to 1.5 % by weight of a C12-22 fatty acid or salt, preferably stearic acid and, e) 0 to 12 % added water. The polymers are suitable as biodegradable rigid sheet or flexible film materials for use in packaging foodstuffs.

L'invention concerne un polymère biodégradable dont la composition est de g) entre 8 et 80 % en poids d'un amidon modifié pour comprendre un groupe hydroxyalkyle C2-6 ou modifié par la réaction entre un anhydre d'un acide dicarboxylique, de préférence un amidon à forte amylose hydroxypropylée, a) entre 0 et 87,9 % d'amidon, b) entre 4 et 11 % en poids d'un polymère hydrosoluble sélectionné dans le polyvinylacétate, poly(alcool de vinyle) et les copolymères d'éthylène et vinylalcool dont le point de fusion est compatible avec l'état fondu des constituants de l'amidon, c) entre 0 et 20 % en poids d'un plastifiant au polyol, de préférence du glycérol, d) entre 0,1 et 1,5 % en poids d'un acide gras C12-22 ou sel, de préférence un acide stéarique et e) entre 0 et 12 % d'eau ajoutée. Les polymères sont utilisés comme feuille rigide biodégradable ou matières de film souple convenant à l'emballage de produits alimentaires.

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