Polyhydroxyalkanoic acid fibers with high strength, fibers with high strength and high modulus of elasticity, and processes for producing the same
US7662325B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Feb 1, 2007 |
| Grant date | Feb 16, 2010 |
| Priority date | — |
| Expiry date | Jan 12, 2028 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2967
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.