# US 2019/0167798 A1 · Membrane for sticking to living organism, and method for producing same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0167798 A1 - Document ID: US20190167798A1 - Status: Published application - Kind: A1 - Application number: 16/260,638 - Filed: 2019-01-29 - Published: 2019-06-06 - Earliest claimed: 2016-11-18 - Assignees: Panasonic Intellectual Property Management Co., Ltd. - Applicants: Panasonic Intellectual Property Management Co., Ltd. - Inventors: TOMOKO KAWASHIMA; HARUKA KUSUKAME; TAKAHIRO AOKI; YUKO TANIIKE - Web page: https://patentgrep.com/patent/US20190167798A1 ## CPC - A61K 47/38: Cellulose; Derivatives thereof - B32B 23/046: {of natural rubber or synthetic rubber} - A61K 8/0216: {Solid or semisolid forms} - A61K 8/731: {Cellulose; Quaternized cellulose derivatives} - A61L 15/00: Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads (for liquid bandages A61L26/00; radioactive dressings {A61N5/1029}) - A61L 27/20: Polysaccharides - A61Q 19/00: Preparations for care of the skin - B32B 5/022: {Non-woven fabric} - B32B 7/06: permitting easy separation - B32B 17/06: comprising glass as the main or only constituent of a layer, next to another layer of a specific {material} - B32B 23/00: Layered products comprising {a layer of} cellulosic plastic substances {, i.e. substances obtained by chemical modification of cellulose, e.g. cellulose ethers, cellulose esters, viscose} - B32B 23/042: {of metal} - B32B 23/08: of synthetic resin - B32B 23/10: next to a fibrous or filamentary layer - B32B 25/14: comprising {synthetic rubber copolymers (B32B25/18 and B32B25/20 take precedence)} - B32B 27/281: {comprising polyimides} - B32B 27/302: {comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers} - B32B 27/304: {comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF} - B32B 27/308: {comprising acrylic (co)polymers} - B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)} - B32B 27/322: {comprising halogenated polyolefins, e.g. PTFE} - B32B 27/34: comprising polyamides - B32B 27/36: comprising polyesters - B32B 27/365: {comprising polycarbonates} - B32B 27/40: comprising polyurethanes - C08B 16/00: Regeneration of cellulose - C08J 5/18: Manufacture of films or sheets - C08L 1/02: Cellulose; Modified cellulose - B32B 2250/03: 3 layers - B32B 2250/40: Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA - B32B 2262/0207: Elastomeric fibres - B32B 2262/023: Aromatic vinyl resin, e.g. styrenic (co)polymers - B32B 2262/0238: Vinyl halide, e.g. PVC, PVDC, PVF, PVDF - B32B 2262/0246: Acrylic resin fibres - B32B 2262/0253: Polyolefin fibres - B32B 2262/0261: Polyamide fibres - B32B 2262/0269: Aromatic polyamide fibres - B32B 2262/0276: Polyester fibres - B32B 2262/0284: Polyethylene terephthalate [PET] or polybutylene terephthalate [PBT] - B32B 2262/0292: Polyurethane fibres - B32B 2262/062: Cellulose fibres, e.g. cotton - B32B 2307/402: Coloured - B32B 2307/54: Yield strength; Tensile strength - B32B 2307/704: Crystalline - B32B 2307/72: Density - B32B 2307/724: Permeability to gases, adsorption - B32B 2307/732: Dimensional properties - B32B 2307/748: Releasability - B32B 2451/00: Decorative or ornamental articles - B32B 2535/00: Medical equipment, e.g. bandage, prostheses or catheter - C08J 2301/02: Cellulose; Modified cellulose - C08L 2203/02: for biomedical use - Y02P 20/54: using solvents, e.g. supercritical solvents or ionic liquids - 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) - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - A61L: METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES (preservation of bodies or disinfecting characterised by the agents employed A01N; preserving, e.g. sterilising, food or foodstuffs A23; preparations for medical, dental or toiletry purposes A61K) - A61Q: SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS - C08B: POLYSACCHARIDES; DERIVATIVES THEREOF (polysaccharides containing less than six saccharide radicals attached to each other by glycosidic linkages C07H; fermentation or enzyme-using processes C12P19/00; sugar industry C13; production of cellulose D21) - C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29) - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS ## Abstract A cellulose membrane according to an embodiment of the present disclosure is a self-supporting cellulose membrane having a thickness of between 20 nm and 1300 nm, inclusive, composed of regenerated cellulose having a weight average molecular weight of 150,000 or more. ## Claims ### Claim 1 A membrane for sticking to living organism, wherein the membrane for sticking to living organism is self-supporting; the membrane for sticking to living organism is formed of regenerated cellulose having a weight average molecular weight of 150,000 or more, and the membrane for sticking to living organism has a thickness of between 20 nm and 1300 nm, inclusive. ### Claim 2 (depends on 1) The membrane for sticking to living organism according to claim 1, wherein the membrane for sticking to living organism has an area of 7 mm2 or more. ### Claim 3 (depends on 1) The membrane for sticking to living organism according to claim 1, wherein the membrane for sticking to living organism has a tensile strength of 23 MPa or more. ### Claim 4 (depends on 1) The membrane for sticking to living organism according to claim 1, wherein the membrane for sticking to living organism has a water vapor transmission rate of 1×104 g/m2·24 h or more. ### Claim 5 (depends on 1) The membrane for sticking to living organism according to claim 1, wherein the membrane for sticking to living organism has a contact angle with water of 30° or less. ### Claim 6 (depends on 1) The membrane for sticking to living organism according to claim 1, wherein the membrane for sticking to living organism has a degree of crystallinity of between 0% and 12%, inclusive. ### Claim 7 (depends on 1) The membrane for sticking to living organism according to claim 1, wherein the membrane for sticking to living organism has a bulk density of between 0.3 g/cm3 and 1.5 g/cm3, inclusive. ### Claim 8 (depends on 1) The membrane for sticking to living organism according to claim 1, wherein a component acting on living organism or a component protecting living organism is retained by at least a part inside the membrane. ### Claim 9 (depends on 1) The membrane for sticking to living organism according to claim 1, wherein a coloring component is retained by at least a part inside the membrane; and the membrane is used as cosmetics or medical supplies. ### Claim 10 (depends on 1) A multilayer sheet comprising: a membrane for sticking to living organism according to claim 1; and a first protective layer disposed on one of principal surfaces of the membrane for sticking to living organism, wherein the first protective layer is detachable from the one of principal surfaces. ### Claim 11 (depends on 10) The multilayer sheet according to claim 10, further comprising: a second protective layer disposed on the other of the principal surfaces of the membrane for sticking to living organism. ### Claim 12 A method for producing a membrane for sticking to living organism, the method comprising: (A) preparing a cellulose solution containing a first solvent containing at least an ionic liquid; wherein the cellulose has a weight average molecular weight of 150,000 or more; (B) applying the cellulose solution to a surface of a substrate having a contact angle with water of 70° or less to form a liquid membrane on the surface; (C) immersing the liquid membrane in a liquid that is not capable of dissolving cellulose; and (D) removing the first solvent and a part other than the ionic liquid of the liquid from the liquid membrane, after the step (C). ### Claim 13 (depends on 12) The method for producing a membrane for sticking to living organism according to claim 12, wherein the step (B) includes (B1) preparing the substrate by subjecting a polymer material to surface modification. ### Claim 14 (depends on 12) The method for producing a membrane for sticking to living organism according to claim 12, wherein the step (A) further includes (Aa) diluting the cellulose solution. ### Claim 15 (depends on 14) The method for producing a membrane for sticking to living organism according to claim 14, wherein in the step (Aa), the cellulose solution is diluted by diluting a mixture of an ionic liquid, or the first solvent and the cellulose having a weight average molecular weight of 150,000 or more, in a second solvent. ### Claim 16 (depends on 12) The method for producing a membrane for sticking to living organism according to claim 12, wherein a part other than the ionic liquid in the solvent contained in the cellulose solution includes an aprotic polar solvent having a SP value of 12 or more. ### Claim 17 (depends on 16) The method for producing a membrane for sticking to living organism according to claim 16, wherein the aprotic polar solvent is dimethyl sulfoxide. ### Claim 18 (depends on 12) The method for producing a membrane for sticking to living organism according to claim 12, further comprising (E) heating the liquid membrane, before the step (C). ### Claim 19 (depends on 18) The method for producing a membrane for sticking to living organism according to claim 18, wherein in the step (E), the liquid membrane is heated at a temperature lower than a decomposition temperature of the ionic liquid in the first solvent. ### Claim 20 (depends on 12) The method for producing a membrane for sticking to living organism according to claim 12, further comprising step (F) of gelating the liquid membrane, after the step (B). ### Claim 21 (depends on 12) The method for producing a membrane for sticking to living organism according to claim 12, wherein an anion contained in the ionic liquid is amino acid. ### Claim 22 (depends on 21) The method for producing a membrane for sticking to living organism according to claim 21, wherein the amino acid has a terminal carboxyl group and a terminal amino group. ### Claim 23 (depends on 21) The method for producing a membrane for sticking to living organism according to claim 21, wherein a cation contained in the ionic liquid is a quaternary ammonium cation. ### Claim 24 (depends on 12) The method for producing a membrane for sticking to living organism according to claim 12, wherein in the step (C), voltage is applied to the liquid. ### Claim 25 (depends on 24) The method for producing a membrane for sticking to living organism according to claim 24, wherein the voltage is lower than a voltage at which the liquid is electrolyzed. ### Claim 26 (depends on 12) The method for producing a membrane for sticking to living organism according to claim 12, further comprising: (G) immersing a membrane provided in the step (D) in a solution containing a component that acts on living organism or a component that protects living organism, followed by drying.