Composition and method for production of a highly flexible pha sheet

A process for producing a monoaxially oriented, biaxially oriented, and/or annealed aliphatic polyester resin composition, comprising:

• melt extruding an aliphatic polyester resin composition comprising a polyhydroxyalkanoate, an ethylene-vinyl acetate copolymer resin or similarly functional material, and an ester of citrate acid plasticizer or similarly functional material
• annealing said melt extruded sheet at 50-170° C.;
• orienting said annealed sheet in the machine direction followed by orientation in the transverse direction, in the transverse direction followed by orientation in the machine direction, in the machine direction, or in the transverse direction;
• and
• annealing monoaxially or biaxially oriented sheet during orientation above Tg of both said polyhydroxyalkanoate and said ethylene vinyl acetate resin but below the melting point of said polyhydroxyalkanoate component.

A process for producing a monoaxially oriented, biaxially oriented, and/or annealed aliphatic polyester resin composition, comprising:

• annealing a melt extruded aliphatic polyester resin sheet at 50-170° C. for 5-600 minutes wherein said melt extruded aliphatic polyester resin sheet comprises a polyhydroxyalkanoate, an ethylene-vinyl acetate copolymer resin or similarly functional material, and an ester of citrate acid plasticizer or similarly functional material at 50-170° C. for 5-600 minutes;
• orienting said annealed sheet first in either the machine direction or the transverse direction and optionally second in either the machine direction or the transverse direction creating a monoaxially or biaxially oriented sheet;
• and
• annealing said monoaxially or biaxially oriented sheet during orientation above Tg of both said polyhydroxyalkanoate and said ethylene vinyl acetate resin but below the melting point of said polyhydroxyalkanoate component.