Biodegradable articles based on starch and process for...

C - Chemistry – Metallurgy – 08 – L

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400/1354

C08L 3/02 (2006.01) C08B 30/12 (2006.01) C08L 23/08 (2006.01) A61F 13/15 (2006.01)

Patent

CA 2028130

Formed articles comprising destructurized starch, an ethylene-acrylic acid copolymer and a product of the interaction of starch and ethylene-acrylic acid copolymer wherein the starch not bound to the copolymer is in the form of particles having sizes below 1 micron. The water content of such articles is lower than the one usually present in the starch. Said formed articles can also contain urea in an amount no higher than 30 % by weight and/or ammonia in an amount not higher than 0.5 % by weight. The process for obtaining such articles comprises the steps of extruding starch, an ethylene-acrylic acid copolymer and optionally water, urea and/or ammonia at a temperature ranging from 90 to 150°C, reducing the water content to values lower than 6 % by weight and injection molding or extrusion blowing the resulting composition.

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