POLYMER BLENDS WITH IMPROVED RHEOLOGY AND IMPROVED UNNOTCHEDIMPACT STRENGTH

摘要

This invention relates to a blend of biodegradable polymers comprising: (A) about 15% to about 60% by weight of at least one flexible biodegradable polymer (A) having a glass transition less than about 0~C, (B) about 85% to about 40% by weight of at least one rigid biodegradable polymer (B) having a glass transition greater than about 10~C; said percentages being based on th e total weight of the polymer blend; wherein said polymer blend has a unnotche d Izod impact strength according to ASTM D256 of at least 9 ft-lbs/in at 23~C. In one embodiment, the polymer blend has a unnotched Izod impact strength according to ASTM D256 at least 20 ft-lbs/in at 23~C.