# US 2021/0275407 A1 · Sheet

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- Number: US 2021/0275407 A1
- Document ID: US20210275407A1
- Status: Published application
- Kind: A1
- Application number: 16/960,778
- Filed: 2019-01-08
- Published: 2021-09-09
- Earliest claimed: 2018-01-10
- Assignees: Oji Holdings Corporation
- Applicants: Oji Holdings Corporation
- Inventors: Emi AIZAWA; Koh SAKAI
- Web page: https://patentgrep.com/patent/US20210275407A1

## CPC

- A61K 8/0212: {Face masks}
- A61K 8/0208: {Tissues; Wipes; Patches}
- A61K 8/0216: {Solid or semisolid forms}
- A61K 8/24: Phosphorous; Compounds thereof
- A61K 8/731: {Cellulose; Quaternized cellulose derivatives}
- A61Q 19/00: Preparations for care of the skin
- C08J 5/18: Manufacture of films or sheets
- C08L 29/04: Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
- C08L 71/02: Polyalkylene oxides
- D21H 11/18: Highly hydrated, swollen or fibrillatable fibres
- D21H 11/20: Chemically or biochemically modified fibres
- D21H 27/00: Special paper not otherwise provided for, e.g. made by multi-step processes
- A61K 2800/10: General cosmetic use
- A61K 2800/542: characterized by the charge
- C08J 2329/04: Polyvinyl alcohol; Partially hydrolysed homopolymers or copolymers of esters of unsaturated alcohols with saturated carboxylic acids
- C08J 2371/02: Polyalkylene oxides
- C08J 2401/16: Esters of inorganic acids
- C08L 2201/50: Aqueous dispersion, e.g. containing polymers with a glass transition temperature (Tg) above 20°C
- C08L 2203/16: used for films
- C08L 2205/16: Fibres; Fibrils
- 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)
- A61Q: SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
- 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)
- D21H: PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR

## Abstract

The present invention is intended to provide an ultrafine cellulose fiber-containing wet sheet, which is easily handled upon the use thereof and is excellent in terms of adhesiveness to the skin. The present invention relates to a sheet comprising cellulose fibers having a fiber width of 1000 nm or less and water, wherein the sheet is gelatinous, the cellulose fibers have ionic substituents, the water content percentage is 70% by mass or more with respect to the total mass of the sheet, and the tensile strength is 0.08 MPa or more.

## Claims

### Claim 1

A sheet comprising cellulose fibers having a fiber width of 1000 nm or less and water, wherein
the sheet is gelatinous,
the cellulose fibers have ionic substituents,
the water content percentage is 70% by mass or more with respect to the total mass of the sheet, and
the tensile strength is 0.08 MPa or more.

### Claim 2 (depends on 1)

The sheet according to claim 1, wherein the fiber width of the cellulose fibers is 8 nm or less.

### Claim 3 (depends on 1)

The sheet according to claim 1, which has a tensile elastic modulus of 0.5 MPa or more.

### Claim 4 (depends on 1)

The sheet according to claim 1, which has an elongation of 5.0% or more.

### Claim 5 (depends on 1)

The sheet according to claim 1, which has a haze of 20.0% or less.

### Claim 6 (depends on 1)

The sheet according to claim 1, wherein the density of the sheet in an absolute dry state is 0.5 g/cm3 or more.

### Claim 7 (depends on 1)

The sheet according to claim 1, wherein the ionic substituents are phosphoric acid groups or phosphoric acid group-derived substituents.

### Claim 8 (depends on 1)

The sheet according to claim 1, which further comprises a resin component.

### Claim 9 (depends on 1)

The sheet according to claim 1, which further comprises an external preparation for skin.

### Claim 10 (depends on 1)

The sheet according to claim 1, which is used as a cosmetic sheet.