Plastic and nonmetallic article shaping or treating: processes – Forming continuous or indefinite length work – Shaping by extrusion
Reexamination Certificate
2007-02-01
2010-02-16
Del Sole, Joseph S. (Department: 1791)
Plastic and nonmetallic article shaping or treating: processes
Forming continuous or indefinite length work
Shaping by extrusion
C264S210700, C264S210800, C264S211150, C264S211170
Reexamination Certificate
active
07662325
ABSTRACT:
The present invention is a process for producing a fiber, comprising: melt-extruding polyhydroxyalkanoic acid; solidifying the polyhydroxyalkanoic acid by quenching it to its glass transition temperature +15° C. or less, to form an amorphous fiber; cold-drawing the amorphous fiber at its glass transition temperature +20° C. or less; and subjecting the fiber to heat treatment under tension. The present invention can provide: a process for producing a fiber with high strength, and the fiber produced through the process; and a process for producing a fiber with high strength and high modulus of elasticity and the fiber with high strength and high modulus of elasticity produced through the process, regardless of molecular weights of PHAs varying depending on origins such as a wild type PHAs-producing microorganism product, a genetically modified product, and a chemical product.
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Doi Yoshiharu
Iwata Tadahisa
Yamane Hideki
Birch & Stewart Kolasch & Birch, LLP
Del Sole Joseph S.
Dye Robert
Japan Science and Technology Agency
Riken
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