Compatibilized blends of biodegradable polymers with...

C - Chemistry – Metallurgy – 08 – L

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C08L 67/04 (2006.01) C08L 67/02 (2006.01)

Patent

CA 2550402

This invention relates to a blend of biodegradable polymers comprising: (A) about 5% to about 95% by weight of at least one flexible biodegradable polymer (A) having a glass transition less than about 0~C, (B) about 5% to about 95% by weight of at least one rigid biodegradable polymer (B) having a glass transition greater than about 10 ~C, and (C) about 0.25 to about 10 weight% of at least one compatibilizer (C), said percentages being based on the total weight of the polymer blend; where the polymer blend has a higher zero shear melt viscosity than polymers (A) and (B) separately.

La présente invention concerne un mélange de polymères biodégradables qui renferme: (A) entre environ 5 % et environ 95 % en poids d'au moins un polymère biodégradable souple (A) dont la température de transition vitreuse est inférieure à environ 0 ·C, (B) entre environ 5 % et environ 95 % en poids d'au moins un polymère biodégradable rigide (B) dont la température de transition vitreuse est supérieure à environ 10 ·C, et (C) entre environ 0,25 et environ 10 % en poids d'au moins un agent de compatibilité (C), ces pourcentages étant basés sur le poids total du mélange de polymères. Ledit mélange de polymères présente une viscosité à l'état fondu à cisaillement nul qui est supérieure à celle des polymères (A) et (B) pris séparément.

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