Toughened biodegradable materials.
Biodegradable materials are often difficult to process and have poor impact properties. This patent describes improved biodegradable materials, blends of 70 to 80 wt% flexible biodegradable polymer with a glass transition less than 0[degrees]C and 30 to 20 wt% rigid biodegradable polymer having a glass transition greater than 10[degrees]C. The blends have a notched Izod impact strength of at least 7.5 ft-lbs/inch. Soft or flexible biopolymers include aliphatic-aromatic copolyesters, and aliphatic polyesters. Rigid biopolymers include synthetic polyesters or polyester amides. A popular biodegradable resin is polylactic acid, which is a strong, rigid resin that can be injection-molded, extruded, thermoformed, or spun and is biorenewable. These materials may also contain other biodegradable additives to compensate for the reduced biodegradability.
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|Title Annotation:||industry PATENTS|
|Article Type:||Brief article|
|Date:||Mar 1, 2007|
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