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US 8,273,278 B2Granted
Process of making water-insoluble polyglutamic acid fibers
AssigneeFar East New Century Corporation
InventorsJo-Wei Huang, Mei-Ting Fan Chiang, Ken-Yuan Chang
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Abstract
A water-insoluble polyglutamic acid (PGA) fiber and a preparation method thereof are provided. In the preparation method, the PGA is cross-linked by a cross-linking agent and then passes through a spinning nozzle to form PGA fibers. Therefore, the highly water-absorbing PGA, which cannot be spun by conventional methods, can be spun to form PGA fibers and maintain the high water-absorption ability.
Claims16
A method of spinning water-insoluble polyglutamic acid (PGA) fibers, comprising:
- (a) preparing a PGA aqueous solution having an initial viscosity of η0;
- (b) adding a cross-linking agent to the PGA aqueous solution to perform cross-linking reaction;
- (c) performing the cross-linking reaction until a spinnable viscosity is reached, wherein the spinnable viscosity is from [η0+ 1/500(ηf−η0)] to <ηf, and the ηf is the viscosity when the PGA aqueous solution begins to climb rod;
- and
- (d) forming PGA fibers by spinning out the cross-linked PGA solution from a spinning nozzle.
2 more elements
Dependencies are inferred from the claim text.