Liquid lignin composition, lignin-based resin, and method of increasing the solubility of lignin

Patent metadata

Field	Value
Publication number	US-10717873-B2
Application number	US-201716079039-A
Country	US
Kind code	B2
Filing date	Mar 20, 2017
Priority date	Mar 21, 2016
Publication date	Jul 21, 2020
Grant date	Jul 21, 2020

Abstract

The present invention relates to a liquid lignin mixture comprising 3-50 wt % methanol, 12-50 wt % lignin and 5-85 wt % aqueous alkali solution wherein the concentration of said aqueous alkali solution is 1 to 50 wt % of alkali in water, based on the weight of said alkali solution prior to mixing with the other components of the mixture. The liquid lignin mixture can be used to manufacture lignin-based phenolic resins, which are particularly useful in the manufacture of laminates.

First claim

The invention claimed is:

1. A mixture comprising 3-50 wt % methanol, 12-50 wt % lignin and 5-85 wt % aqueous alkali solution, wherein the concentration of said aqueous alkali solution is 1 to 50 wt % of alkali in water, based on the weight of said alkali solution prior to mixing with the other components of the mixture.

2. A mixture according to claim 1 , comprising 40-50 wt % aqueous alkali solution.

3. A mixture according to claim 1 , comprising 35-50 wt % lignin.

4. A mixture according to claim 3 , comprising 40-50 wt % lignin.

5. A mixture according to claim 1 , wherein the alkali is sodium hydroxide, potassium hydroxide, calcium hydroxide, magnesium hydroxide or a mixture thereof.

6. A mixture according to claim 1 , comprising 3-30 wt % methanol.

7. A mixture according to claim 6 , comprising 3-12 wt % methanol.

8. A mixture according to claim 1 , wherein said mixture has been heated at a temperature of 30-95° C.

9. A resin obtainable by adding phenol and formaldehyde to a mixture according to claim 1 and heating at a temperature of 70-90° C. for 2-8 hours.

10. A laminate manufactured using a resin according to claim 9 .

Assignees

• Stora Enso Oyj

Inventors

• Zafar Ashar
• Areskogh Dimitri
• Ekström Jesper

Classifications

• C08G8/34

  by natural resins or resin acids, e.g. rosin · CPC title

• C07G1/00

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

• C08G8/38

  Block or graft polymers prepared by polycondensation of aldehydes or ketones onto macromolecular compounds · CPC title

• C08L61/14

  Modified phenol-aldehyde condensates · CPC title

• C09J197/005 Primary

  Lignin · CPC title