Lignin derivative, lignin resin composition, rubber composition, and molding material

Patent metadata

Field	Value
Publication number	US-10138377-B2
Application number	US-201515509331-A
Country	US
Kind code	B2
Filing date	Aug 31, 2015
Priority date	Sep 12, 2014
Publication date	Nov 27, 2018
Grant date	Nov 27, 2018

Abstract

A lignin derivative that is extracted from biomass and is used for rubber reinforcement or for use in a molding material is provided. Such a lignin derivative has a number average molecular weight of 300 to 2,000, and contains a component that is soluble in a polar organic solvent, in an amount of 80% by mass or more. When such a lignin derivative is incorporated, a lignin resin composition, a rubber composition, or a molding material, all of which have excellent low hysteresis loss characteristics, elastic modulus, or tensile properties, can be obtained. Furthermore, when a component that is thermofusible is used as the soluble component, a lignin resin composition, a rubber composition, or a molding material, all of which have superior aforementioned characteristics, can be obtained.

First claim

The invention claimed is:

1. A lignin derivative extracted from biomass and used for rubber reinforcement or for use in a molding material, the lignin derivative containing a soluble component in a polar organic solvent in an amount of 95% by mass or more and an insoluble component in a polar organic solvent in an amount of 1 to 5% by mass, and the soluble component having a number average molecular weight of 300 to 2,000.

2. The lignin derivative according to claim 1 , wherein the polar organic solvent is acetone.

3. The lignin derivative according to claim 1 , wherein the number average molecular weight of the soluble component is 300 to 750.

4. The lignin derivative according to claim 1 , wherein the softening temperature of the soluble component is 80° C. to 160° C.

5. The lignin derivative according to claim 1 , wherein the lignin derivative is extracted by cooking biomass by means of an organosolv process using a chemical agent including an organic solvent.

6. The lignin derivative according to claim 5 , wherein the organic solvent includes at least one of an alcohol, a ketone, and an ether.

7. The lignin derivative according to claim 5 , wherein the organic solvent includes a lower alcohol.

8. The lignin derivative according to claim 7 , wherein the lignin derivative is further purified by using an another organic solvent including acetone.

9. A lignin resin composition comprising:
the lignin derivative according to claim 1 ; and
a resin material.

10. The lignin resin composition according to claim 9 , wherein the resin material includes a phenolic resin.

11. The lignin resin composition according to claim 10 , wherein the phenolic resin includes at least one of a cashew-modified phenolic resin, an alkyl-modified phenolic resin, and a cashew resin.

12. A rubber composition comprising:
the lignin derivative according to claim 1 ; and
a rubber material.

13. The rubber composition according to claim 12 , wherein the rubber material includes at least one of natural rubber, butadiene rubber, and styrene-butadiene rubber.

14. The rubber composition according to claim 12 , further comprising a crosslinking agent and/or a filler.

15. A molding material comprising:
the lignin derivative according to claim 1 ; and
a resin material.

Assignees

• Sumitomo Bakelite Co

Inventors

• Murai Taketoshi
• Nakagawa Hiroshige
• Matsumoto Mitsutaka

Classifications

• C08L97/005 Primary

  Lignin · CPC title

• C08L21/00

  Compositions of unspecified rubbers · CPC title

• C07G1/00

  Low-molecular-weight derivatives of lignin (high-molecular-weight derivatives of lignin {C08H6/00}) · CPC title

• C08H6/00 Primary

  Macromolecular compounds derived from lignin, e.g. tannins, humic acids · CPC title

• C08L2205/02

  containing two or more polymers of the same C08L -group · CPC title