# US 11,440,973 B2 · Cellulose acetate, cellulose acetate composition, molded article, and film

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- Number: US 11,440,973 B2
- Document ID: US11440973B2
- Status: Granted
- Kind: B2
- Application number: 16/480,515
- Filed: 2018-01-17
- Published: 2019-12-26
- Granted: 2022-09-13
- Earliest claimed: 2017-01-25
- Assignees: Daicel Corporation
- Applicants: Daicel Corporation
- Inventors: Yuya Ashida; Ikuhiro Suzuki; Akihiro Higuchi
- Web page: https://patentgrep.com/patent/US11440973B2

## CPC

- C08B 3/06: Cellulose acetate {, e.g. mono-acetate, di-acetate or tri-acetate}
- C08J 5/18: Manufacture of films or sheets
- C08K 5/00: Use of organic ingredients
- C08L 1/12: Cellulose acetate
- C08J 2301/12: Cellulose acetate
- 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)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

The purpose of the present invention is to provide cellulose acetate with which it is possible to obtain a molded article containing cellulose acetate having a small amount of lumps. The cellulose acetate has an acetylation degree of 52% or more and 59% or less, and an acetone-insoluble substance content of 0.04 wt % or less.

## Claims

### Claim 1

A cellulose acetate having an acetylation degree of 52% or more and 59% or less, and an acetone-insoluble substance content of 0.04 wt % or less,
wherein the cellulose acetate has a ratio of a molar content of glucose to a sum of molar contents of glucose, xylose and mannose is 98.0% or more in sugar composition analysis,
when the acetone-insoluble substance content is measured by steps of:
dissolving cellulose acetate in acetone at a solid concentration of 3 wt % to obtain a solution;
filtering the solution by suction filtration at room temperature of 25° C. under a reduced pressure of 30 mmHg using a glass filter having a pore diameter of 5 to 10 μm to obtain filtration residue;
washing a dope adhering to the filtration residue with acetone;
drying the filtration residue and the glass filter,
wherein the glass filter is weighed before and after filtering,
wherein the acetone-insoluble substance content is calculated as:
acetone-insoluble substance content (wt %)=[weight of glass filter after filtration (g)−weight of filter before filtration (g)]/weight of cellulose acetate (g)×100.

### Claim 2 (depends on 1)

The cellulose acetate according to claim 1, wherein a viscosity of the cellulose acetate at 6 wt % cellulose acetate per volume of acetone solution is 30 mPa·s or more and 200 mPa·s or less.

### Claim 3 (depends on 1, 2)

A cellulose acetate composition comprising the cellulose acetate according to claim 1 or 2 and a plasticizer.

### Claim 4 (depends on 1, 2)

A molded article comprising the cellulose acetate according to claim 1 or 2.

### Claim 5 (depends on 1, 2)

A film comprising the cellulose acetate according to claim 1 or 2.