Cellulose derivative and use thereof

Patent metadata

Field	Value
Publication number	US-10982009-B2
Application number	US-201615766116-A
Country	US
Kind code	B2
Filing date	Aug 29, 2016
Priority date	Oct 9, 2015
Publication date	Apr 20, 2021
Grant date	Apr 20, 2021

Abstract

To provide a cellulose derivative excellent in thermoplasticity, water resistance and strength (elastic modulus, impact strength), a cellulose derivative, which is obtained by introducing a short-chain organic group (acetyl group), a medium-chain organic group having 3 to 5 carbon atoms and a long-chain organic group having 6 to 30 carbon atoms at the following substitution degrees DSs into a cellulose, is used: Short-chain organic group: 0.7≤DSSH≤1.5; Medium-chain organic group: 0.5≤DSME≤2.0; Long-chain organic group: 0.1≤DSLO<0.5; and 2.4≤DSSH+DSME+DSLO≤3.

First claim

The invention claimed is:

1. A cellulose derivative in which at least a part of hydrogen atoms of hydroxyl groups of a cellulose is substituted with a short-chain organic group (acetyl group) having 2 carbon atoms, a medium-chain organic group having 3 to 5 carbon atoms and a long-chain organic group having 12 to 30 carbon atoms at the following substitution degrees:
0.7≤DS SH ≤1.5
0.5≤DS ME ≤2.0
0.1≤DS LO <0.5
2.4≤DS SH +DS ME +DS LO ≤3

where DS SH represents the substitution degree with the short-chain organic group; DS ME represents the substitution degree with the medium-chain organic group; and DS LO represents the substitution degree with the long-chain organic group.

2. The cellulose derivative according to claim 1 , wherein the medium-chain organic group is an acyl group having 3 or 4 carbon atoms.

3. A resin composition comprising the cellulose derivative according to claim 2 .

4. The resin composition according to claim 3 , comprising 50% by mass or more of the cellulose derivative.

5. A molded body molded from the resin composition according to claim 3 .

6. The cellulose derivative according to claim 1 , wherein the medium-chain organic group is a propionyl group and the long-chain organic group is a stearyl group.

7. A resin composition comprising the cellulose derivative according to claim 6 .

8. The resin composition according to claim 7 , comprising 50% by mass or more of the cellulose derivative.

9. A molded body molded from the resin composition according to claim 7 .

10. A resin composition comprising the cellulose derivative according to claim 1 .

11. The resin composition according to claim 10 , comprising 50% by mass or more of the cellulose derivative.

12. A molded body molded from the resin composition according to claim 5 .

13. A method for producing the cellulose derivative according to claim 1 , comprising
an activation treatment step of bringing an activation solvent having affinity for a cellulose into contact with the cellulose to swell the cellulose, and
a reaction step of reacting the activated cellulose with reactants for introducing the short-chain organic group, medium-chain organic group and long-chain organic group.

14. The method for producing the cellulose derivative, according to claim 13 , wherein the reactants for introducing the short-chain organic group, medium-chain organic group and long-chain organic group are carboxylic acids or carboxylic anhydrides.

15. The method for producing the cellulose derivative according to claim 14 , wherein the activation treatment comprises a step of soaking the cellulose in water and then removing water and a step of soaking the cellulose in acetic acid and then removing acetic acid; and the activated cellulose is reacted with a mixed anhydride of stearic acid and propionic acid obtained by reaction between stearic acid and propionic acid while controlling a mixing ratio thereof.

Assignees

• Nec Corp

Inventors

• Shimura Midori
• Tanaka Shukichi
• Toyama Kiyohiko
• Iji Masatoshi

Classifications

• C08B3/16 Primary

  Preparation of mixed organic cellulose esters {, e.g. cellulose aceto-formate or cellulose aceto-propionate} · CPC title

• C08L1/14

  Mixed esters, e.g. cellulose acetate-butyrate · CPC title

• C08L1/10

  Esters of organic acids {, i.e. acylates} · CPC title

• C08B1/003 Primary

  Preparation of cellulose solutions, i.e. dopes, with different possible solvents, e.g. ionic liquids (solutions used in the manufacture of monocomponent artificial filaments or cellulose or derivatives thereof D01F2/02) · CPC title

• C08L2203/30

  used for thermoforming · CPC title