Biobased modifiers for polyvinylchloride blends

摘要

Compositions of polymer blends of polyvinylchloride (PVC) and polyhydroxyalkanoate (PHA) are described. In certain embodiments, the PHA is a poly-3-hydroxybutyrate-co-4-hydroxybutyrate copolymer having a weight percent 4-hydroxybutyrate of 30-45%. In other embodiments the PHA is a multiphase P3HB-4HB copolymer blend having one phase fully amorphous. The PHA is mixed with the PVC to optimize its optical, thermal and mechanical properties. In certain embodiments, the polymer is branched with optionally additives that improve properties. Methods of making the compositions of the invention are also described. The invention also includes articles, films and laminates comprising the compositions.

主权项

1. A composition, comprising:
a polymer blend of
a polyvinyl chloride (PVC) polymer; andone or more biobased non-extractable nonvolatile plasticizing polyhydroxyalkanoate (PHA) copolymers,wherein:
the one or more PHA copolymers improve performance of the polymer blend; and at least one PHA copolymer is a copolymer of 3-hydroxybutyrate and one or more comonomers selected from lactic acid, 3-hydroxypropionic acid (3HP), 4-hydroxybutyrate (4HB), 5-hydroxyvalerate (5HV), 3-hydroxyhexanoate (3HH), 6-hydroxyhexanoate (6HH) and 3-hydroxyoctanoate (3HO), wherein the comonomer content of the at least one PHA copolymer is about 25-90% by weight of the at least one PHA copolymer, and further wherein the one or more PHA copolymers have a percent crystallinity of about 0.2 to 1% as measured by differential scanning calorimetry (DSC).