B - Operations – Transporting – 32 – B
Patent
B - Operations, Transporting
32
B
B32B 23/08 (2006.01) C09D 167/04 (2006.01)
Patent
CA 2177065
Biodegradable film comprises at least one layer comprising water-swellable water-insoluble biodegradable cellulose and/or cellulose acetate and at least one layer comprising crystalline or crystallisable microbiologically produced polyhydroxyalkanoate. Preferably the polyhydroxyalkanoate is R-poly-3-hydroxybutyrate or a copolymer thereof containing 3-20 mol percent of 3-hydroxybutyrate, balance 3- hydroxyvalerate. Composite film may be made by laying the polyhydroxyalkanoate sides of two films together and heat sealing them together.
Un film biodégradable comprend au moins une couche contenant de la cellulose et/ou de l'acétate de cellulose biodégradable insoluble dans l'eau et gonflant dans l'eau, et au moins une couche contenant un polyhydroxyalcanoate obtenu microbiologiquement, cristallin ou cristallisable. De préférence, le polyhydroxyalcanoate est un R-poly-3-hydrobutyrate ou un copolymère de celui-ci contenant de 3 à 20 pour cent en mole de 3-hydroxybutyrate, le reste étant 3-hydroxyvalérate. On obtient un film composite en juxtaposant les côtés polyhydroxyalcanoate de deux films et en les assemblant par thermosoudage.
Kemmish David John
Montador James Henry
Metabolix Inc.
Smart & Biggar
LandOfFree
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