# US 11,306,430 B2 · Treatment method for cotton textile

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- Number: US 11,306,430 B2
- Document ID: US11306430B2
- Status: Granted
- Kind: B2
- Application number: 17/308,161
- Filed: 2021-05-05
- Published: 2021-08-19
- Granted: 2022-04-19
- Earliest claimed: 2018-10-16
- Assignees: Imam Abdulrahman Bin Faisal University
- Applicants: Imam Abdulrahman Bin Faisal University
- Inventors: Khaled Salama; Reem Y. Al Jindan
- Web page: https://patentgrep.com/patent/US11306430B2

## CPC

- D06M 11/46: Oxides or hydroxides of elements of Groups 4 or 14 of the Periodic Table; Titanates; Zirconates; Stannates; Plumbates
- D06M 16/00: Biochemical treatment of fibres, threads, yarns, fabrics, or fibrous goods made from such materials, e.g. enzymatic
- A01N 25/34: Shaped forms, e.g. sheets, not provided for in any other sub-group of this main group
- A01N 31/02: Acyclic compounds
- A01N 59/16: Heavy metals; Compounds thereof
- D06M 10/001: {Treatment with visible light, infrared or ultraviolet, X-rays}
- D06M 10/06: Inorganic compounds or elements
- D06M 10/08: Organic compounds
- D06M 11/38: Oxides or hydroxides of elements of Groups 1 or 11 of the Periodic Table
- D06M 13/144: Alcohols; Metal alcoholates (D06M13/11 takes precedence)
- D06M 13/188: Monocarboxylic acids; Anhydrides, halides or salts thereof {(D06M13/1845 takes precedence)}
- D06M 23/08: Processes in which the treating agent is applied in powder or granular form (adhesives for multi-layer textile fabrics D06M17/00)
- D06M 2101/06: cellulosic
- D06M 2101/12: Keratin fibres or silk
- D06M: TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS, FABRICS, FEATHERS OR FIBROUS GOODS MADE FROM SUCH MATERIALS
- 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

## Abstract

A method of making an antimicrobial textile comprising TiO2 nanoparticles is described. The TiO2 nanoparticles are immobilized by first treating a textile with a base, and then contacting with TiO2 nanoparticles in a solution of an alcohol and acid. The textile may be subsequently irradiated with UV light prior to use. The antimicrobial textile shows high effectiveness against the growth and proliferation of microorganisms transmitted within indoor environments.

## Claims

### Claim 1

Treatment method for a cotton textile, the method comprising:
contacting the cotton textile with an inorganic base to produce a treated cotton textile;
rinsing the treated cotton textile to produce a rinsed cotton textile;
depositing a TiO2 coating composition onto the rinsed cotton textile, wherein the TiO2 coating composition contains TiO2 nanoparticles, methanol, and an organic acid, and the depositing forms a coated textile, wherein the TiO2 coating composition fully coats the cotton textile during the depositing; and
irradiating the coated textile with a UV light to form an antimicrobial textile, wherein the irradiating forms hydrogen bonds between the TiO2 nanoparticles and surfaces of individual fibrils of the cotton textile,
wherein the TiO2 coating composition contains the TiO2 nanoparticles at a concentration of 10-100 ppm by weight, and the TiO2 nanoparticles are anatase TiO2 nanoparticles having an average particle diameter of less than 21 nm.

### Claim 2 (depends on 1)

The method of claim 1, wherein the TiO2 coating composition contains 60-90 wt % of the organic acid and 10-40 wt % of the methanol relative to a total weight of the TiO2 coating composition.

### Claim 3 (depends on 1)

The method of claim 1, wherein the cotton textile and the TiO2 nanoparticles are not contacted with a binding agent, and the TiO2 coating composition does not comprise a binding agent.

### Claim 4 (depends on 1)

The method of claim 1, wherein the antimicrobial textile contains the TiO2 nanoparticles at a weight percentage of 0.01-2.00 wt % relative to a total weight of the antimicrobial textile.

### Claim 5 (depends on 1)

The method of claim 1, wherein the cotton textile consists essentially of cotton fiber.

### Claim 6 (depends on 1)

The method of claim 1, wherein the antimicrobial textile comprises fibers having a surface area in which 15-40% of the surface area is covered by TiO2 nanoparticles.

### Claim 7 (depends on 1)

The method of claim 1, wherein the antimicrobial textile has an antimicrobial activity at least 100 times greater than a second textile that was treated with an essentially identical method that did not have TiO2 nanoparticles, when the antimicrobial textile and the second textile are contacted with similar bacteria and/or fungal cells and a growth medium.

### Claim 8 (depends on 7)

The method of claim 7, wherein the antimicrobial textile and the second textile are contacted with similar bacteria, which are gram-positive cocci.

### Claim 9 (depends on 7)

The method of claim 7, wherein the antimicrobial textile and the second textile are contacted with similar fungal cells, which are yeast cells.

### Claim 10 (depends on 1)

The method of claim 1, wherein the antimicrobial textile is a component of a bandage, a cast, a gown, a lab coat, a mask, a shoe covering, a face covering, a curtain, a bedcovering, a carpeting, and/or a head covering.

### Claim 11 (depends on 1)

The method of claim 1, wherein the irradiating forms hydrogen bonds directly between hydroxyl groups of cellulose molecules of the cotton textile and surfaces of the TiO2 nanoparticles.

### Claim 12 (depends on 1)

The method of claim 1, further comprising
neutralizing to a pH of 6.5-7.5 by treating with an inorganic acid.

### Claim 13 (depends on 12)

The method of claim 12, wherein the organic acid is acetic acid and the inorganic acid is nitric acid.

### Claim 14 (depends on 12)

The method of claim 12, wherein the cotton textile consists of cotton fibers.

### Claim 15 (depends on 12)

The method of claim 12, further comprising after the depositing and before the irradiating:
heating and drying the coated textile at a temperature of 27-50° C.