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Toughened biodegradable materials.

U.S. Patent 7,160,977 (January 9, 2007), "Polymer Blends With Improved Notched Impact Strength," Wesley Raymond Hale and Candace Michele Tanner (Eastman Chemical Co., Kingsport, Tennessee, USA).

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
Author:Corneliussen, Roger
Publication:Plastics Engineering
Article Type:Brief article
Geographic Code:1USA
Date:Mar 1, 2007
Words:153
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