Fibrous cellulose composite resin and production method therefor, and resin reinforcing material

Patent metadata

Field	Value
Publication number	US-12435211-B2
Application number	US-202017434108-A
Country	US
Kind code	B2
Filing date	Mar 12, 2020
Priority date	Mar 29, 2019
Publication date	Oct 7, 2025
Grant date	Oct 7, 2025

Abstract

A fibrous cellulose composite resin being excellent in strength, a method for producing the same, and a reinforcing material for resins capable of significantly improving resin strength are provided. The fibrous cellulose composite resin includes fibrous cellulose containing microfiber cellulose, a resin, and an acid-modified resin, wherein the microfiber cellulose has an average fiber width of 0.1 μm or larger, an average fiber length of 0.02 to 2.0 mm, and a percentage of fibrillation of 1.0% or higher, and hydroxyl groups substituted with carbamate groups, and the carbamate groups are ionically bonded to acidic groups of the acid-modified resin.

First claim

The invention claimed is:

1. A fibrous cellulose composite resin comprising:
fibrous cellulose, a resin, and an acid-modified resin,
wherein part or all of the fibrous cellulose is microfiber cellulose,
the microfiber cellulose has an average fiber width of 0.1 μm or larger, an average fiber length of 0.02 to 2.0 mm, wherein 20% or more of the microfiber cellulose has a fiber length of 0.2 mm or shorter, and a percentage of fibrillation of 1.0% to 30.0%, part or all of its hydroxyl groups being substituted with carbamate groups, and
part or all of the carbamate groups are ionically bonded to acidic groups of the acid-modified resin.

2. The fibrous cellulose composite resin according to claim 1 , wherein a degree of substitution of the hydroxyl groups by the carbamate groups is 0.05 to 0.5.

3. The fibrous cellulose composite resin according to claim 2 , wherein the acid-modified resin is a maleic anhydride-modified resin.

4. The fibrous cellulose composite resin according to claim 1 , wherein the acid-modified resin is a maleic anhydride-modified resin.

5. The fibrous cellulose composite resin according to claim 4 , wherein the composite resin comprises 1 to 200 parts by mass of the maleic anhydride-modified resin based on 100 parts by mass of the microfiber cellulose.

6. The fibrous cellulose composite resin according to claim 1 , wherein a difference between a solubility parameter of the microfiber cellulose and a solubility parameter of the resin ranges from 10 to 0.1.

7. A method for producing a fibrous cellulose composite resin, comprising:
defibrating a cellulose raw material into microfiber cellulose and kneading the microfiber cellulose with a resin to obtain the fibrous cellulose composite resin, wherein the defibrating is performed so that the microfiber cellulose has an average fiber width of 0.1 μm or larger, an average fiber length of 0.02 to 2.0 mm, wherein 20% or more of the microfiber cellulose has a fiber length of 0.2 mm or shorter, and a percentage of fibrillation of 1.0% to 30.0%,
the method further comprising:
prior to or following the defibrating, modifying the cellulose fibers by substituting part or all of hydroxyl groups of the cellulose fibers with carbamate groups, and
prior to or during the kneading, adding an acid-modified resin and a dispersant, wherein the acid-modified resin has a molecular weight that is higher than a molecular weight of the dispersant.

8. The method for producing a fibrous cellulose composite resin according to claim 7 , wherein the modifying is performed prior to the defibrating.

9. A reinforcing material for thermoplastic or thermosetting resins, comprising:
fibrous cellulose and an acid-modified resin,
wherein part or all of the fibrous cellulose is microfiber cellulose,
the microfiber cellulose has an average fiber width of 0.1 μm or larger, an average fiber length of 0.02 to 2.0 mm, wherein 20% or more of the microfiber cellulose has a fiber length of 0.2 mm or shorter, and a percentage of fibrillation of 1.0% to 30.0%, part or all of its hydroxyl groups being substituted with carbamate groups, and
part or all of the carbamate groups are ionically bonded to acidic groups of the acid-modified resin.

Assignees

• Daio Seishi Kk

Inventors

• Matsusue Ikko
• Ochiai Yu

Classifications

• C08L2205/16

  Fibres; Fibrils · CPC title

• C08L2205/03

  containing three or more polymers in a blend · CPC title

• C08L2205/025

  containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure · CPC title

• C08J2423/26

  modified by chemical after-treatment · CPC title

• C08J2401/10

  Esters of organic acids · CPC title