# US 8,771,571 B2 · Method for preparing high water-absorption and anti-bacterial gamma polyglutamic acid fibers

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- Number: US 8,771,571 B2
- Document ID: US8771571B2
- Status: Granted
- Kind: B2
- Application number: 13/051,236
- Filed: 2011-03-18
- Published: 2012-04-05
- Granted: 2014-07-08
- Earliest claimed: 2010-10-04
- Assignees: Far Eastern New Century Corporation
- Applicants: Jo-Wei Huang; Chia-Chang Liu; Ying-Nan Tsai
- Inventors: Jo-Wei Huang; Chia-Chang Liu; Ying-Nan Tsai
- Web page: https://patentgrep.com/patent/US8771571B2

## CPC

- C08G 69/08: derived from amino-carboxylic acids
- C08G 69/10: Alpha-amino-carboxylic acids {(polysuccinimides C08G73/1092)}
- D04H 1/30: Collagen
- D04H 1/4266: Natural fibres not provided for in group D04H1/425
- D04H 13/00: Other non-woven fabrics
- D06M 11/07: with halogens; with halogen acids or salts thereof; with oxides or oxyacids of halogens or salts thereof
- D06M 11/11: with halogen acids or salts thereof
- D06M 11/70: with oxides of phosphorus; with hypophosphorous, phosphorous or phosphoric acids or their salts
- D06M 16/00: Biochemical treatment of fibres, threads, yarns, fabrics, or fibrous goods made from such materials, e.g. enzymatic
- D01F 1/10: Other agents for modifying properties
- D01F 6/68: from polyaminoacids or polypeptides
- Y10T 428/2913: Rod, strand, filament or fiber
- Y10T 442/2525: Coating or impregnation functions biologically [e.g., insect repellent, antiseptic, insecticide, bactericide, etc.]
- Y10T 442/696: Including strand or fiber material which is stated to have specific attributes [e.g., heat or fire resistance, chemical or solvent resistance, high absorption for aqueous compositions, water solubility, heat shrinkability, etc.]
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- D04H: MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL (weaving D03; knitting D04B; braiding D04C; net-making D04G; sewing D05B; tufting D05C; finishing non-woven fabrics D06); FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING {; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION}(non-woven fabrics having an intermediate or external layer of a different kind, e.g. of woven fabric, B32B)
- D06M: TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- D01F: CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A method for preparing a polyglutamic acid (γ-PGA) fiber having antibacterial and water absorption properties is provided. The method includes providing a γ-PGA fiber and immersing it in a sodium hypochlorite solution. A relation exists between an immersing time T of the γ-PGA fiber and a concentration X of the sodium hypochlorite solution as shown in the formula below: 10.2≦(T−64.55X2+50X)≦15.2, wherein X is 0.006-0.4 wt %.

## Claims

### Claim 1

A method for preparing a γ-polyglutamic acid (γ-PGA) fiber having antibacterial property and water absorptivity, comprising:
immersing a γ-PGA fiber into a sodium hypochlorite solution, wherein a relation exists between an immersing time T and a concentration X of the sodium hypochlorite solution as shown in the following formula:
10.2≦(T−64.55X2+50X)≦15.2,
wherein X is 0.006-0.4 wt %.

### Claim 2 (depends on 1)

The method of claim 1, wherein the γ-PGA fiber is prepared by cross-linking γ-PGA and then spinning.

### Claim 3 (depends on 1)

The method of claim 1, wherein the pH value of the sodium hypochlorite solution is 6-8.

### Claim 4 (depends on 1)

The method of claim 1, wherein the sodium hypochlorite solution further comprises a pH buffer agent.

### Claim 5 (depends on 4)

The method of claim 4, wherein the pH buffer agent is a phosphoric acid solution, an ammonium chloride solution, an acetic acid solution, a sodium hydrogen phosphate solution, a disodium hydrogen phosphate solution, a benzoic acid solution, or a mixture thereof.

### Claim 6 (depends on 1)

A polyglutamic acid (γ-PGA) fiber having antibacterial and water absorption properties, wherein the γ-PGA fiber is prepared by the method of claim 1.

### Claim 7 (depends on 6)

A polyglutamic acid (γ-PGA) fabric having antibacterial and water absorption properties, wherein the γ-PGA fabric is prepared from the fiber of claim 6.