Method of producing resin modifier, resin modifier, and composite material

Patent metadata

Field	Value
Publication number	US-11891501-B2
Application number	US-202017438211-A
Country	US
Kind code	B2
Filing date	Feb 26, 2020
Priority date	Mar 12, 2019
Publication date	Feb 6, 2024
Grant date	Feb 6, 2024

Abstract

A method of producing a resin modifier, the method comprising a process of polymerizing an ethylene unsaturated monomer in the presence of a cellulose nanofiber, the cellulose nanofiber being reacted with an amine or a quaternary ammonium salt compound.

First claim

The invention claimed is:

1. A method of producing a resin modifier, the method comprising a process of polymerizing an ethylene unsaturated monomer to form a polymer in the presence of a cellulose nanofiber, the cellulose nanofiher being reacted with an amine or a quaternary ammonium salt compound, wherein the polymer of the ethylene unsaturated monomer has a weight-average molecular weight of from 5,000 to 3,000,000.

2. The method of producing a resin modifier according to claim 1 , wherein the resin modifier is in a particulate state.

3. The method of producing a resin modifier according to claim 1 , wherein the process of polymerizing is emulsion polymerization or suspension polymerization.

4. The method of producing a resin modifier according to claim 1 , wherein the process of polymerizing is performed without using an emulsifier.

5. The method of producing a resin modifier according to claim 1 , wherein a proportion of an ethylene unsaturated monomer having a functional group in the ethylene unsaturated monomer is 5 mol % or less.

6. The method of producing a resin modifier according to claim 1 , wherein a product obtained by defibrating a polyvalent carboxylic acid-modified cellulose is used as the cellulose nanofiber, the polyvalent carboxylic acid-modified cellulose being obtained by allowing a cellulose-based raw material to react with a polyvalent carboxylic acid.

7. The method of producing a resin modifier according to claim 6 , wherein the polyvalent carboxylic acid comprises at least one selected from the group consisting of a dicarboxylic acid, a tricarboxylic acid, a tetracarboxylic acid and a hexacarboxylic acid.

8. The method of producing a resin modifier according to claim 6 , wherein the polyvalent carboxylic acid comprises citric acid.

9. The method of producing a resin modifier according to claim 1 , wherein the oxidized cellulose is obtained without using a compound having a piperidine structure.

10. A resin modifier, comprising a cellulose nanofiber that is reacted with an amine or a quaternary ammonium salt compound, and a polymer of an ethylene unsaturated monomer, wherein the polymer of the ethylene unsaturated monomer has a weight-average molecular weight of from 5,000 to 3,000,000.

11. The resin modifier according to claim 10 , wherein the cellulose nanofiber is a product obtained by defibrating a polyvalent carboxylic acid-modified cellulose, the polyvalent carboxylic acid-modified cellulose being obtained by allowing a cellulose-based raw material to react with a polyvalent carboxylic acid.

12. The resin modifier according to claim 10 , being in a particulate state.

13. The resin modifier according to claim 10 , wherein a proportion of a structural unit having a functional group among structural units of the polymer of an ethylene unsaturated monomer is 5 mol % or less.

14. The resin modifier according to claim 10 , wherein an amount of the ethylene unsaturated monomer with respect to 100 parts by mass of the cellulose nanofiber is from 5 parts by mass to 1,000 parts by mass.

15. A composite material, comprising the resin modifier according to claim 10 and a resin.

16. The composite material according to claim 15 , wherein the resin includes a component that is identical to a component included in the resin modifier, or the resin includes a segment or a functional group having an affinity with the resin modifier.

Assignees

• Toagosei Co Ltd
• Univ Tokyo

Inventors

• Kamiya Daisuke
• Gotou Akihiro
• Nakano Shun
• Matsuki Shiroshi
• Fujisawa Shuji
• Saito Tsuguyuki
• Saito Ryo

Classifications

• C08L25/06 Primary

  Polystyrene · CPC title

• C08J5/06

  using pretreated fibrous materials · CPC title

• D21C3/18

  with halogens or halogen-generating compounds (bleaching cellulose pulp D21C9/12) · CPC title

• C08J2325/06

  Polystyrene · CPC title

• C08J2401/02

  Cellulose; Modified cellulose · CPC title