Method for increasing the reactivity of lignin

Patent metadata

Field	Value
Publication number	US-10246619-B2
Application number	US-201615251509-A
Country	US
Kind code	B2
Filing date	Aug 30, 2016
Priority date	Mar 29, 2012
Publication date	Apr 2, 2019
Grant date	Apr 2, 2019

Abstract

The present invention relates to a method for increasing the reactivity of lignin, wherein the method comprises the following steps: a) forming, under heating at a temperature of 30-70° C., an aqueous dispersion comprising alkali and lignin, wherein the alkali comprises a hydroxide of an alkali metal; and b) heating the dispersion formed in step a) at a temperature of 50-95° C. for producing alkalated lignin.

First claim

The invention claimed is:

1. A method for producing a binder composition, the method comprising:
(a) forming, under heating at a temperature of 30-70° C., an aqueous dispersion consisting of alkali, lignin, and water, wherein the alkali comprises a hydroxide of an alkali metal, and wherein the concentration of the lignin is 10-50 weight-% based on the total weight of the aqueous dispersion;
(b) heating the aqueous dispersion formed in step (a) at a temperature of 50-95° C., thereby producing alkalated lignin, wherein the alkalated lignin has an increased reactivity relative to the lignin; and
(c) cooking an aqueous composition comprising reactant components including the alkalated lignin, a polymerizable substance, and a crosslinking agent in the presence of a catalyst at a temperature of 60-95° C. for polymerizing the reactant components until a binder composition is formed.

2. The method of claim 1 , wherein step of cooking an aqueous composition comprises cooking the aqueous composition at a temperature of 65-90° C.

3. The method of claim 1 , wherein step of cooking an aqueous composition comprises cooking the aqueous composition at a temperature of 75-85° C.

4. The method of claim 1 , wherein the crosslinking agent is an aldehyde.

5. The method of claim 1 , wherein the crosslinking agent is formaldehyde.

6. The method of claim 1 , wherein the polymerizable substance is selected from a group consisting of phenol, cresol, resorcinol, and mixtures thereof.

7. The method claim 1 , wherein the catalyst is selected from a group consisting of sodium hydroxide, potassium hydroxide, and mixtures thereof.

Assignees

• Upm Kymmene Corp

Inventors

• Pietarinen Suvi
• Ringena Okko
• Eskelinen Kati
• Valkonen Sanna

Classifications

• C07G1/00

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

• C08G8/24

  with mixtures of two or more phenols which are not covered by only one of the groups C08G8/10 - C08G8/20 · CPC title

• C09J161/12

  with polyhydric phenols · CPC title

• C09J197/005 Primary

  Lignin · CPC title

• C08H6/00 Primary

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