Fibrous cellulose and method for manufacturing the same, and fibrous cellulose composite resin and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-12012469-B2
Application number	US-201917053867-A
Country	US
Kind code	B2
Filing date	May 24, 2019
Priority date	May 31, 2018
Publication date	Jun 18, 2024
Grant date	Jun 18, 2024

Abstract

A fibrous cellulose having a high resin reinforcing effect and a method for manufacturing the same, and a fibrous cellulose composite resin having high strength and a method for manufacturing the same. A fibrous cellulose has an average fiber width of 0.1 μm or more, an average fiber length of 0.02 to 3.0 mm, and a fibrillation ratio of 1.0% or more. A kneaded product of this fibrous cellulose and a resin is formed into a fibrous cellulose composite resin. In manufacturing the fibrous cellulose, a raw material fiber is defibrated so as to have an average fiber width of 0.1 μm or more, an average fiber length of 0.02 to 3.0 mm, and a fibrillation ratio of 1.0% or more. The fibrous cellulose obtained by this method and a resin are kneaded to manufacture a fibrous cellulose composite resin.

First claim

The invention claimed is:

1. A fibrous cellulose having
an average fiber width of 0.1 μm or more, an average fiber length of 0.02 to 3.0 mm, wherein at least 12% of all fibers have a fiber length of 0.2 mm or less, and a fibrillation ratio ranging from 1.0% to 30.0%.

2. The fibrous cellulose according to claim 1 ,
wherein a part or all of hydroxyl groups in the fibrous cellulose are replaced with functional groups represented by the following structural formula (1) or (2):

[Chemical Formula 1]

where R in the structural formulas is any one of: a linear, branched, or annular saturated hydrocarbon group or a derivative thereof; a linear, branched, or annular unsaturated hydrocarbon group or a derivative thereof; and an aromatic group or a derivative thereof.

3. The fibrous cellulose of claim 1 , wherein a crystallinity of the fibrous cellulose ranges from 50% to 90%.

4. A fibrous cellulose composite resin,
which is a kneaded product of a fibrous cellulose having an average fiber width of 0.1 μm or more, an average fiber length of 0.02 to 3.0 mm, wherein at least 12% of all fibers have a fiber length of 0.2 mm or less, and a fibrillation ratio ranging from 1.0% to 30.0%, and a resin.

5. A fibrous cellulose composite resin comprising
a fibrous cellulose having an average fiber width of 0.1 μm or more, an average fiber length of 0.02 to 3.0 mm, wherein at least 12% of all fibers have a fiber length of 0.2 mm or less, and a fibrillation ratio ranging from 1.0% to 30.0%, a resin, and a polybasic acid.

6. A method for manufacturing a fibrous cellulose, comprising
defibrating a raw material fiber so as to have an average fiber width of 0.1 μm or more, an average fiber length of 0.02 to 3.0 mm, wherein at least 12% of all fibers have a fiber length of 0.2 mm or less, and a fibrillation ratio ranging from 1.0% to 30.0%.

7. The method for manufacturing a fibrous cellulose according to claim 6 , comprising
modifying the fibrous cellulose with a polybasic acid.

8. The method for manufacturing a fibrous cellulose according to claim 6 ,
wherein the defibrating is performed with a refiner.

9. A method for manufacturing a fibrous cellulose composite resin, comprising
kneading a fibrous cellulose obtained by defibrating a raw material fiber so as to have an average fiber width of 0.1 μm or more, an average fiber length of 0.02 to 3.0 mm, wherein at least 12% of all fibers have a fiber length of 0.2 mm or less, and a fibrillation ratio ranging from 1.0% to 30.0% with a resin.

10. The method for manufacturing a fibrous cellulose composite resin according to claim 9 , comprising
concentrating the fibrous cellulose prior to the kneading.

11. The method for manufacturing a fibrous cellulose composite resin according to claim 10 , comprising
adding a resin powder to the fibrous cellulose prior to or during the concentration.

12. A method for manufacturing a fibrous cellulose composite resin, comprising
kneading a fibrous cellulose obtained by defibrating a raw material fiber so as to have an average fiber width of 0.1 μm or more, an average fiber length of 0.02 to 3.0 mm, wherein at least 12% of all fibers have a fiber length of 0.2 mm or less, and a fibrillation ratio ranging from 1.0% to 30.0%, a resin, and a polybasic acid to modify the fibrous cellulose with the polybasic acid during this kneading.

13. A method for manufacturing a fibrous cellulose composite resin, comprising
kneading a fibrous cellulose obtained by defibrating a raw material fiber so as to have an average fiber width of 0.1 μm or more, an average fiber length of 0.02 to 3.0 mm, wherein at least 12% of all fibers have a fiber length of 0.2 mm or less, and a fibrillation ratio ranging from 1.0% to 30.0%, a resin, and a polybasic acid to obtain a fibrous cellulose composite resin containing the polybasic acid.

Assignees

• Daio Seishi Kk

Inventors

• Matsusue Ikko

Classifications

• D21H11/20 Primary

  Chemically or biochemically modified fibres · CPC title

• D21H11/18

  Highly hydrated, swollen or fibrillatable fibres · CPC title

• C08J5/045

  with vegetable or animal fibrous material · CPC title

• C08B3/12

  of polybasic organic acids · CPC title

• D21H15/02

  characterised by configuration · CPC title