Cellulose acetate fibers, cellulose acetate composition, and method for producing same

Patent metadata

Field	Value
Publication number	US-11220763-B2
Application number	US-201716083699-A
Country	US
Kind code	B2
Filing date	Mar 9, 2017
Priority date	Mar 11, 2016
Publication date	Jan 11, 2022
Grant date	Jan 11, 2022

Abstract

Disclosed herein is cellulose acetate fibers that have an excellent affinity for resins and is capable of reinforcing resins. The cellulose acetate fibers have a cellulose triacetate I crystal structure and a number-average fiber diameter of 2 nm or more but 400 nm or less.

First claim

The invention claimed is:

1. A cellulose acetate fiber comprising:
a cellulose triacetate I crystal structure identified from a diffraction profile obtained by powder X-ray diffraction;
an average substitution degree of 2.0 or more but 3.0 or less;
a number-average fiber diameter of 2 nm or more but 400 nm or less; and
a viscosity-average polymerization degree of 50 or more but 2,500 or less;
wherein the cellulose acetate fiber does not include a cellulose I crystal structure.

2. A cellulose acetate fiber comprising:
a cellulose triacetate I crystal structure identified from a diffraction profile obtained by powder X-ray diffraction;
an average substitution degree of 2.0 or more but 3.0 or less;
a number-average fiber diameter of 4 nm or more but 300 nm or less; and
a viscosity-average polymerization degree of 50 or more but 2,500 or less;
wherein the cellulose acetate fiber does not include a cellulose I crystal structure.

3. A cellulose acetate fiber comprising:
a cellulose triacetate I crystal structure identified from a diffraction profile obtained by powder X-ray diffraction;
an average substitution degree of 2.0 or more but 3.0 or less;
a number-average fiber diameter of 6 nm or more but 100 nm or less; and
a viscosity-average polymerization degree of 50 or more but 2,500 or less;
wherein the cellulose acetate fiber does not include a cellulose I crystal structure.

4. The cellulose acetate fiber according to claim 1 , whose viscosity-average polymerization degree is 50 or more but 1,500 or less.

5. A cellulose acetate composition comprising one or more of the cellulose acetate fiber according to claim 1 .

6. The cellulose acetate composition according to claim 1 , further comprising a resin.

7. The cellulose acetate fiber according to claim 1 , wherein the average substitution degree is 2.8 or more but 3.0 or less.

8. The cellulose acetate fiber according to claim 2 , wherein the average substitution degree is 2.8 or more but 3.0 or less.

9. The cellulose acetate fiber according to claim 3 , wherein the average substitution degree is 2.8 or more but 3.0 or less.

10. The cellulose acetate fiber according to claim 1 , wherein the number-average fiber diameter is 2 nm or more but 23 nm or less.

11. The cellulose acetate fiber according to claim 1 , wherein the number-average fiber diameter is 4 nm or more but 23 nm or less.

12. The cellulose acetate fiber according to claim 1 , wherein the number-average fiber diameter is 6 nm or more but 23 nm or less.

13. The cellulose acetate fiber according to claim 1 , whose viscosity-average polymerization degree is 400 or more but 1,500 or less.

14. The cellulose acetate fiber according to claim 1 , whose viscosity-average polymerization degree is 1,000 or more but 1,500 or less.

15. The cellulose acetate fiber according to claim 1 , wherein the cellulose acetate fiber has peaks at two positions around 2θ=7.6 to 8.6° and 2θ=15.9 to 16.9° in a diffraction profile obtained from an X-ray diffraction photograph using CuKα (λ=1.542184 Å).

16. The cellulose acetate fiber according to claim 2 , wherein the cellulose acetate fiber has peaks at two positions around 2θ=7.6 to 8.6° and 2θ=15.9 to 16.9° in a diffraction profile obtained from an X-ray diffraction photograph using CuKα (λ=1.542184 Å).

17. The cellulose acetate fiber according to claim 3 , wherein the cellulose acetate fiber has peaks at two positions around 2θ=7.6 to 8.6° and 2θ=15.9 to 16.9° in a diffraction profile obtained from an X-ray diffraction photograph using CuKα (λ=1.542184 Å).

Assignees

• Univ Hokkaido Nat Univ Corp
• Jujo Paper Co Ltd
• Daicel Corp

Inventors

• Uraki Yasumitsu
• Konno Haruo
• Shimamoto Shu

Classifications

• C08B3/06 Primary

  Cellulose acetate {, e.g. mono-acetate, di-acetate or tri-acetate} · CPC title

• C08H8/00

  Macromolecular compounds derived from lignocellulosic materials {(pretreatment thereof B27N)} · CPC title

• B82Y30/00

  Nanotechnology for materials or surface science, e.g. nanocomposites · CPC title

• D01F2/28 Primary

  from organic cellulose esters or ethers, e.g. cellulose acetate · CPC title

• C08L1/12

  Cellulose acetate · CPC title