发明名称 METHOD FOR MAKING BIODEGRADABLE POLYHYDROXYALKANOATE COPOLYMERS HAVING IMPROVED CRYSTALLIZATION PROPERTIES
摘要 <p>A method for enhancing the rate of a first biodegradable polyhydroxyalkanoate comprising a copolymer, or a blend thereof, of at least two randomly repeating monomer units (RRMU), wherein the first RRMU has the structure (I) wherein R1 is H, or C1 or C2 alkyl, and n is 1 or 2; and the second RRMU is different from the first RRMU and comprises at least one monomer selected from the group consisting of the structures (II) wherein R2 is a C3-C19 alkyl or C3-C19 alkenyl, and (III) wherein m is from 2 to about 16, and wherein the copolymer has a melting point Tm1, by solution blending or melt blending the first biodegradable polyhydroxyalkanoate with (b) a second crystallizable biodegradable polyhydroxyalkanoate homopolymer or copolymer, which comprises at least one randomly repeating monomer unit having the structure (IV) wherein R3 is H, or C1 or C2 alkyl, and p is 1 or 2. The second biodegradable polyhydroxyalkanoate has a melting point Tm2, wherein Tm2 is at least about 20 °C greater than Tm1. Methods for forming shaped articles from the blending of components (a) and (b) are also disclosed.</p>
申请公布号 WO2002050156(A2) 申请公布日期 2002.06.27
申请号 US2001050461 申请日期 2001.12.20
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