# US 11,998,623 B2 · Water-soluble unidirectional moisture transport traditional Chinese medicine facial mask and preparation thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,998,623 B2 - Document ID: US11998623B2 - Status: Granted - Kind: B2 - Application number: 17/877,005 - Filed: 2022-07-29 - Published: 2023-04-13 - Granted: 2024-06-04 - Earliest claimed: 2021-10-13 - Assignees: City University of Hong Kong - Applicants: City University of Hong Kong - Inventors: Jinlian Hu; Yifan Si; Shuo Shi; Chunxia Guo - Web page: https://patentgrep.com/patent/US11998623B2 ## CPC - A61K 8/0212: {Face masks} - A45D 44/002: {Masks for cosmetic treatment of the face} - A61K 8/20: Halogens; Compounds thereof - A61K 8/345: {containing more than one hydroxy group} - A61K 8/731: {Cellulose; Quaternized cellulose derivatives} - A61K 8/735: {Mucopolysaccharides, e.g. hyaluronic acid; Derivatives thereof} - A61K 8/922: {of vegetable origin} - A61K 8/9789: Magnoliopsida [dicotyledons] - A61K 8/9794: Liliopsida [monocotyledons] - A61Q 19/007: {Preparations for dry skin} - Y02A 50/30: Against vector-borne diseases, e.g. mosquito-borne, fly-borne, tick-borne or waterborne diseases whose impact is exacerbated by climate change - A61K: PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES (devices or methods specially adapted for bringing pharmaceutical products into particular physical or administering forms A61J3/00; chemical aspects of, or use of materials for deodorisation of air, for disinfection or sterilisation, or for bandages, dressings, absorbent pads or surgical articles A61L; soap compositions C11D) - A45D: HAIRDRESSING OR SHAVING EQUIPMENT (wigs, toupees or the like A41G3/00, A41G5/00; hairdressers' chairs A47C1/04; hair cutting appliances, razors B26B); EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING - A61Q: SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS - Y02A: TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE ## Abstract A water-soluble unidirectional moisture transport traditional Chinese medicine facial mask and a preparation method thereof. The facial mask includes a facial mask substrate and a facial mask effective ingredient layer, wherein a lateral surface of the facial mask substrate is a hydrophobic surface, and the other lateral surface is a superhydrophilic surface; the facial mask effective ingredient layer is loaded to the superhydrophilic surface, in which facial mask effective ingredients include a traditional Chinese medicine colloid. In use, by simply spraying water, the effective ingredients such as the traditional Chinese medicine on the surface can be quickly dissolved to exert effects. Its hydrophobic layer can be kept dry, which not only delays volatilization of liquid and prolongs the effective time, but also is easy to operate and is clean and hygienic. The present invention has a simple preparation method, is non-harmful and non-toxic, low-carbon and environmentally friendly. ## Claims ### Claim 1 A dry facial mask, comprising: a superhydrophilic substrate including a first lateral surface and a second lateral surface; a hydrophobic layer provided on the first lateral surface of the superhydrophilic substrate; and a facial mask effective ingredient comprising a traditional Chinese medicine colloid of Bletilla striata gel loaded to the second lateral surface, wherein the facial mask effective ingredient further comprises a plant essential oil, a moisturizing agent, hyaluronic acid, a surfactant and a metal salt, wherein a mass ratio of the traditional Chinese medicine colloid to the plant essential oil to the moisturizing agent to the hyaluronic acid to the surfactant to the metal salt is (20-40):(5-10):(2-10):1:(0.2-2):(0.5-1), wherein the facial mask effective ingredient is provided on the second lateral surface of the superhydrophilic substrate in the form of a dried dispersed membrane structure or a dried dispersed particle structure; and the facial mask effective ingredient is dissolvable in water for unidirectional transport away from the second lateral surface. ### Claim 2 (depends on 1) The dry facial mask according to claim 1, wherein the superhydrophilic substrate is a cellulose membrane or a superhydrophilic non-woven fabric. ### Claim 3 (depends on 1) The dry facial mask according to claim 1, wherein the plant essential oil is selected from the group consisting of rose essential oil, tea tree essential oil, lavender essential oil, and grapefruit essential oil and a combination thereof. ### Claim 4 (depends on 1) The dry facial mask according to claim 1, wherein the moisturizing agent is selected from the group consisting of glycerol, butanediol, and propylene glycol and a combination thereof. ### Claim 5 (depends on 1) The dry facial mask according to claim 1, wherein the surfactant is selected from the group consisting of sodium hexadecyl sulfonate, sodium lauryl polyoxyethylene ether sulfate, and coconate diethanolamide and a combination thereof. ### Claim 6 (depends on 1) The dry facial mask according to claim 1, wherein the metal salt is lithium chloride and/or sodium chloride. ### Claim 7 (depends on 1) A preparation method of the dry facial mask according to claim 1, comprising: forming the hydrophobic layer by electrospinning on the first lateral surface of the superhydrophilic substrate; preparing the facial mask effective ingredient on the second lateral surface of the superhydrophilic substrate; and heating and drying to obtain the dry facial mask. ### Claim 8 (depends on 7) The preparation method according to claim 7, wherein the facial mask effective ingredient is prepared by electrostatic spraying. ### Claim 9 (depends on 8) The preparation method according to claim 8, wherein preparing the facial mask effective ingredient comprises: adding the facial mask effective ingredient into water to form an electrostatic spraying stock solution; and wrapping the superhydrophilic substrate on an electrostatic spraying roller with the superhydrophilic surface facing outward, and electrostatically spraying the electrostatic spraying stock solution on the superhydrophilic surface of the superhydrophilic substrate to disperse the facial mask effective ingredient. ### Claim 10 (depends on 9) The preparation method according to claim 9, wherein the mass ratio of the metal salt in the facial mask effective ingredient to water is (0.5-1):200. ### Claim 11 (depends on 9) The preparation method according to claim 9, wherein the electrostatic spraying is performed by a single-needle electrostatic spraying device. ### Claim 12 (depends on 9) The preparation method according to claim 9, wherein conditions of the electrostatic spraying comprise: a voltage of 18-30 kV, an injection pump flow rate of 0.1-0.4 mL/h, and a receiving distance of 5-15 cm. ### Claim 13 (depends on 7) The preparation method according to claim 7, wherein the preparation of the hydrophobic layer comprises: adding a hydrophobic polymer and the metal salt into a dimethylformamide (DMF) and/or tetrahydrofuran solvent, in which a superhydrophobic powder is dispersed to obtain a spinning stock solution; and wrapping the superhydrophilic substrate on a roller, and preparing the hydrophobic layer by electrospinning the spinning stock solution on the superhydrophilic substrate. ### Claim 14 (depends on 13) The preparation method according to claim 13, wherein the electrospinning is performed by a single-needle spinning device. ### Claim 15 (depends on 13) The preparation method according to claim 13, wherein conditions of the electrospinning comprise: a voltage of 18-26 kV, an injection pump flow rate of 0.1-0.4 mL/h, and a receiving distance of 10-15 cm. ### Claim 16 (depends on 13) The preparation method according to claim 13, wherein the hydrophobic polymer is polyurethane and/or polyvinylidene fluoride. ### Claim 17 (depends on 13) The preparation method according to claim 13, wherein the metal salt is lithium chloride and/or sodium chloride. ### Claim 18 (depends on 13) The preparation method according to claim 13, wherein the superhydrophobic powder is superhydrophobic silica aerogel powder or stearic acid-magnesium oxide powder. ### Claim 19 (depends on 13) The preparation method according to claim 13, wherein the mass ratio of the hydrophobic polymer to the superhydrophobic powder to the metal salt to the solvent is (2-5):(0-4):(0.05-0.2):20. ### Claim 20 (depends on 1) The dry facial mask according to claim 1, wherein the hydrophobic layer comprises electrospun fibers of hydrophobic polymer selected from the group consisting of polyurethane and polyvinylidene fluoride and a combination thereof. ### Claim 21 (depends on 20) The dry facial mask according to claim 20, wherein the hydrophobic layer further comprises a superhydrophobic powder selected from the group consisting of a superhydrophobic silica aerogel powder and a stearic acid-magnesium oxide powder.