Patent ID: 7928167

Claim:
A blend comprising a first PHA and a second PHA, wherein: the first PHA is a copolymer consisting of a comonomer I-A and a comonomer I-B; the second PHA is a copolymer consisting of a comonomer 2-A and a comonomer 2-B; the first PHA copolymer and the second PHA copolymer are the same copolymer, in which the ratio of comonomer 1-A:comonomer I-B in the first PHA is different from the ratio of comonomer 2-A:comonomer 2-B in the second PHA; comonomer I-A and comonomer 2-A are both 3-hydroxybutyrate; the first PHA and the second PHA are miscible; and the first PHA has a first glass transition temperature and the second PHA has a second glass transition temperature, wherein the difference between the first and second glass transition temperature is at least about 5° C.