Knobbe, Martens Olson & Bear LLP
Blends of carbon dioxide-propylene oxide copolymer and poly (3-hydroxyalkanoate) and a method of making the same
The present invention provides blends comprising 30-70 parts by weight of poly(3-hydroxyalkanoate) (PHA) resin, 70-30 parts by weight of higher molecular weight carbon dioxide-propylene oxide copolymers (PPC) with over 98% alternating copolymer structure, 1-10 parts by weight of talcum powder, 0.2-3 parts by weight of boron nitride, and 0.1-2 parts by weight antioxidant(s), where the sum of parts of PHA and PPC is 100 parts by weight. The present invention also provides for a method of preparing the blends, which may comprise the step of extrusion and pelletization in a conventional twin-screw extruder. The melt mass in the twin-screw extruder is kept in the range of 175&deg; C.-185&deg; C. The blends can be used in extrusion of plates and sheets, preparation of films and in injection molding. These fabricated articles possess biodegradable property, good mechanical properties, good printing property, good barrier property and sealing property.
Changchun Institute of Applied Chemistry Chinese Academy of Science
C C C C C C
C08K C08L C08K C08K C08L C08K
inventional inventional inventional additional inventional inventional
Chunrong Jingjiang
Sun Liu