Patent ID: 7368503

Claim:
A polymer blend comprising: (A) about 5% to about 95% by weight of at least one flexible biodegradable polymer (A) having a glass transition temperature less than about 0° C., (B) about 95% to about 5% by weight of at least one rigid biodegradable polymer (B) having a glass transition temperature 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; wherein said polymer blend has a higher zero shear melt viscosity than polymers (A) and (B) separately; wherein said compatibilizer (C) comprises a polyacrylate and said rigid biodegradable polymer (B) is selected from the group consisting of polyesteramides; polyethylene terephthalate comprising sulfonated terephthalate units and aliphatic units derived from two or more different diols selected from the group consisting of ethylene glycol, diethylene glycol, triethylene oxide, and polyethylene glycol; biopolymers based on polylactic acid; polyethylene carbonate; polyhydroxyalkanoates; polyhydroxybutyrates; polyhydroxyvalerates; and polyhydroxybutyrate-hydroxyvalerate copolymers.