# US 11,028,186 B2 · Cellulose derivative, cellulose resin composition, molded body and product using same

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- Number: US 11,028,186 B2
- Document ID: US11028186B2
- Status: Granted
- Kind: B2
- Application number: 16/309,989
- Filed: 2017-06-15
- Published: 2019-10-31
- Granted: 2021-06-08
- Earliest claimed: 2016-06-17
- Assignees: NEC Corporation
- Applicants: NEC Corporation
- Inventors: Kiyohiko Toyama; Masatoshi Iji; Midori Shimura; Shukichi Tanaka
- Web page: https://patentgrep.com/patent/US11028186B2

## CPC

- C08B 3/16: Preparation of mixed organic cellulose esters {, e.g. cellulose aceto-formate or cellulose aceto-propionate}
- C08K 3/04: Carbon
- C08L 1/14: Mixed esters, e.g. cellulose acetate-butyrate
- C08K 2201/003: Additives being defined by their diameter
- C08K 2201/005: Additives being defined by their particle size in general
- 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)
- 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

A cellulose derivative obtained by substituting at least part of hydrogen atoms of hydroxy groups of a cellulose with an acyl group having 2 to 4 carbon atoms, a long-chain organic group having 7 or more carbon atoms and a high refractive-index organic group.

## Claims

### Claim 1

A cellulose derivative obtained by substituting at least part of hydrogen atoms of hydroxy groups of a cellulose with an acyl group having 2 to 4 carbon atoms, a long-chain organic group having 7 or more carbon atoms, and a high refractive-index organic group,
wherein the high refractive-index organic group is an aromatic phosphoric acid ester group.

### Claim 2 (depends on 1)

The cellulose derivative according to claim 1, wherein the aromatic phosphoric acid ester group is a diphenyl phosphoric acid ester group or a derivative group thereof.

### Claim 3 (depends on 1)

The cellulose derivative according to claim 1, wherein the acyl group is an acetyl group or/and a propionyl group.

### Claim 4 (depends on 1)

The cellulose derivative according to claim 1, wherein the long-chain organic group is a linear saturated aliphatic acyl group having 14 to 30 carbon atoms.

### Claim 5

A cellulose resin composition, comprising:
a cellulose derivative obtained by substituting at least part of hydrogen atoms of hydroxy groups of a cellulose with an acyl group having 2 to 4 carbon atoms, a long-chain organic group having 7 or more carbon atoms, and a high refractive-index organic group; and
a colorant,
wherein the colorant is a carbon black,
the carbon black is an acidic carbon black having a pH value of 5 or less,
a content of the colorant relative to a total of the cellulose resin composition falls within a range of 0.05 to 10% by mass,
the high refractive-index organic group is an aromatic phosphoric acid ester group.

### Claim 6 (depends on 5)

The cellulose resin composition according to claim 5, wherein an average particle diameter of the carbon black falls within a range of 1 to 20 nm.

### Claim 7 (depends on 5)

The cellulose resin composition according to claim 5, optionally comprising a high refractive-index organic material, wherein a content of the high refractive-index organic material relative to 100 parts by mass of the cellulose derivative is 0 to 100 parts by mass.

### Claim 8 (depends on 7)

The cellulose resin composition according to claim 7, wherein a total content of the cellulose derivative and the high refractive-index organic material relative to the amount of the cellulose resin composition excluding the colorant is 90% by mass or more.

### Claim 9 (depends on 5)

A molded body formed of the cellulose resin composition according to claim 5.

### Claim 10 (depends on 9)

A product using the molded body according to claim 9.

### Claim 11 (depends on 5)

The cellulose resin composition according to claim 5, wherein the aromatic phosphoric acid ester group is a diphenyl phosphoric acid ester group or a derivative group thereof.

### Claim 12 (depends on 5)

The cellulose resin composition according to claim 5, wherein the acyl group is an acetyl group or/and a propionyl group.

### Claim 13 (depends on 5)

The cellulose resin composition according to claim 5, wherein the long-chain organic group is a linear saturated aliphatic acyl group having 14 to 30 carbon atoms.