Polymer blends containing polyhydroxyalkanoates and compositions with good retention of elongation
AssigneeMonsanto Company
InventorsJawed Asrar, Jean R. Pierre
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Abstract
Biodegradable polymer blend compositions are provided which contain oligomeric esters. The oligoester compounds can compatibilize blends of two or more biodegradable polymers resulting in excellent ductility and reduced tendency to embrittlement of products produced from therefrom. In a preferred embodiment of the invention, the blend composition comprises a PHA, polycaprolactone (PCL) and one or more oligomeric esters. In another preferred embodiment of the invention, the blend composition comprises a PHA, polybutylenesuccinate-adipate (PBSUA), and one or more oligomeric esters.
Claims23
A polymer blend composition comprising a polyhydroxyalkanoate polymer (PHA),
- wherein the PHA has the structural formula:
- wherein a=1-4, b=0-15, Y is H, and n is an integer;
- a second polymer selected from the group consisting of polycaprolactone (PCL) and polybutylenesuccinate-adipate (PBSUA), wherein said second polymer is immiscible with PHA, and one or more oligomeric glycol adipic acid ester compatibilizers, in an amount sufficient to improve miscibility of the first and second polymers.
A method of producing a shaped polymeric object comprising melting a polymer blend composition comprising a polyhydroxyalkanoate polymer (PHA),
- wherein the PHA has the structural formula:
- wherein a—1-4, b=0-15, Y is H, and n is an integer;
- a second biodegradable polymer selected from the group consisting of polycaprolactone (PCL) and polybutylenesuccinate-adipate (PBSUA), wherein said second polymer is immiscible with PHA, and one or more oligomeric glycol adipic acid ester compatibilizers, in an amount sufficient to improve miscibility of the first and second polymers, and producing a shaped object therefrom by extrusion, molding, coating, spinning, blowing, thermoforming or calendaring processes or combinations of the processes.
Dependencies are inferred from the claim text.