# US 10,501,870 B2 · Method for preparing regenerated cellulose fibers having anti-bacteria, anti-mite and anti-mould functions and the use thereof

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- Number: US 10,501,870 B2
- Document ID: US10501870B2
- Status: Granted
- Kind: B2
- Application number: 15/760,845
- Filed: 2018-01-04
- Published: 2019-07-04
- Granted: 2019-12-10
- Earliest claimed: 2017-12-29
- Assignees: Infinitus (China) Company Ltd.
- Applicants: Infinitus (China) Company Ltd.
- Inventors: Jiao Wu; Chen Zhang; Liuyun Hu
- Web page: https://patentgrep.com/patent/US10501870B2

## CPC

- D01F 1/103: {Agents inhibiting growth of microorganisms}
- A01N 25/10: Macromolecular compounds
- A01N 65/10: Apiaceae or Umbelliferae [Carrot family], e.g. parsley, caraway, dill, lovage, fennel or snakebed
- A01N 65/22: Lamiaceae or Labiatae [Mint family], e.g. thyme, rosemary, skullcap, selfheal, lavender, perilla, pennyroyal, peppermint or spearmint
- B01J 13/14: Polymerisation; cross-linking
- D01F 2/08: Composition of the spinning solution or the bath
- D01F: CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- A01N: PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF (preservation of food or foodstuff A23); BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES (preparations for medical, dental or toiletry purposes which kill or prevent the growth or proliferation of unwanted organisms A61K); PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- B01J: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS

## Abstract

The present invention provides a method for preparing regenerated cellulose fibers having anti-bacteria, anti-mite and anti-mould functions from a fennel extract, a Litsea cubeba extract, and a thyme essential oil. The present invention also relates to the use of the regenerated cellulose fiber prepared by the above method in the field of anti-bacteria, anti-mite and mildew-resistant fabrics. The invention solves the technical defect that regenerated cellulose fibers have a single function and has poor anti-mite and anti-mould effects in the prior art.

## Claims

### Claim 1

A method for preparing a regenerated cellulose fiber having anti-bacterial, anti-mite and anti-mould functions, comprising the steps of:
(1) preparing a composite slurry;
(2) blending the composite slurry and a denatured cellulose spinning dope to prepare a blended spinning dope; and
(3) spinning the blended spinning dope and performing a post-treatment, thereby producing the regenerated cellulose fiber,
wherein the composite slurry is prepared by a process comprising:
i) blending a Fructus Foeniculi extract and a Litsea cubeba extract to obtain a blended powder;
ii) mixing the blended powder obtained in step i) with a Thymus mongolicus Ronn essential oil to prepare an oily blended powder slurry and further emulsifying the oily blended power slurry to obtain an emulsion; and
iii) reacting the emulsion obtained in step ii) with a urea-formaldehyde resin prepolymer to obtain the composite slurry.

### Claim 2 (depends on 1)

The method of claim 1, wherein the Fructus Foeniculi extract and the Litsea cubeba extract are blended in a mass ratio of 1:(0.5-1.5) in step i), and the particle size D90 of the blended powder is ≤1.568 μm.

### Claim 3 (depends on 1)

The method of claim 1, wherein the mass ratio of the blended powder to the Thymus mongolicus Ronn essential oil in step ii) is (5-10):1.

### Claim 4 (depends on 1)

The method of claim 1, wherein the emulsifying in step ii) is performed by adding the oily blended powder slurry into an aqueous system containing 0.5-1.5% of styrene-maleic anhydride sodium salt, wherein the mass ratio of the oily blended powder slurry to the aqueous system is 1:(2-5), and wherein the particle size D90 of emulsion is ≤2.038 μm.

### Claim 5 (depends on 1)

The method of claim 1, wherein in step iii), the emulsion is reacted with the urea-formaldehyde resin prepolymer at 70-80° C. with stirring, wherein the ratio of the total mass of the Fructus Foeniculi extract, the Litsea cubeba extract and the Thymus mongolicus Ronn essential oil in the emulsion to the mass of the urea-formaldehyde resin prepolymer is (1-3):1, and wherein the particle size D90 of the composite slurry is ≤2.562 μm, and the solid content is 20%-40%.

### Claim 6 (depends on 1)

The method of claim 1, wherein the denatured cellulose spinning dope of the step (2) is prepared by a process comprising: first preparing a viscose dope from a cellulose pulp having a polymerization degree of 800 to 1000 as a raw material, and then adding a denaturant of a polyoxyethylene compound, wherein the ratio of the addition amount of the denaturant to the mass of the α-cellulose in the viscose dope is 0.1-1.0%, the denatured cellulose spinning dope has a viscosity of 60-96 s and the degree of esterification of 65-85.

### Claim 7 (depends on 1)

The method of claim 1, wherein the mass ratio of the composite slurry in the blended spinning dope of the step (2) to the α-cellulose in the denatured cellulose spinning dope is 4.0% to 10.0%.

### Claim 8 (depends on 1)

The method of claim 1, wherein a coagulation bath is used in the step (3) of spinning with a coagulation temperature of 20 to 40° C. and the coagulation bath composition comprises 5.0 to 8.0% of sulfuric acid, 0.5 to 1.0% of aluminum sulfate, 10.0%-16.0% of sodium sulfate, 0.1-0.5% of the polyoxyethylene compound, the balance being water.

### Claim 9 (depends on 1)

The method of claim 1, wherein the post-treatment of step (3) comprises desulfurization, oil bathing, water washing, drying by baking, or a combination thereof.

### Claim 10 (depends on 1)

An anti-bacteria, anti-mite, and/or anti-mould fabric, comprising the anti-bacterial, anti-mite, and/or anti-mould regenerated cellulose fiber prepared by the method of claim 1.