A method for increasing the reactivity of lignin

Patent metadata

Field	Value
Publication number	US-2016237194-A1
Application number	US-201415024725-A
Country	US
Kind code	A1
Filing date	Sep 29, 2014
Priority date	Sep 30, 2013
Publication date	Aug 18, 2016
Grant date	—

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 71-94° 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

1 . A method for increasing the reactivity of lignin, characterized in that the method comprises the following steps:
a) forming, under heating at a temperature of 71-94° 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

2 . The method of claim 1 , characterized in that the concentration of alkali is 5-50 weight-%, based on the total weight of the dispersion in step a).

3 . The method of claim 1 2 , characterized in that the concentration of lignin is 10-50 weight-%, based on the total weight of the dispersion in step a).

4 . The method of claim 1 , characterized in that the temperature in step a) is 71-90° C.

5 . The method of claim 1 , characterized in that the temperature in step b) is 60-85° C.

6 . The method of claim 1 , characterized in that step b) is carried out for 15 minutes-24 hours.

7 . The method of claim 1 , characterized in that the method comprises, before step a), the step i) of reacting lignin with a compound selected from the class of phenols.

8 . The method of claim 7 , characterized in that step i) is carried out at a temperature of 100-140° C. for 1-3 hours in the presence of a catalyst.

9 . The method of claim 1 , characterized in that the method comprises, after step b), the step ii) of adding an aldehyde, a derivative of an aldehyde, or a combination thereof to the dispersion formed in step b).

10 . The method of claim 9 , characterized in that the weight ratio of the aldehyde to the lignin in the dispersion from step b) is 0.2-0.7.

11 . The method of claim 9 , characterized in that the aldehyde is formaldehyde.

12 . Lignin obtainable by the method of claim 1 .

13 . A method for producing a binder composition, characterized in that the method comprises the step of:
(iii) cooking an aqueous composition comprising reactant components including lignin obtainable by the method of claim 1 , 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 with a predetermined viscosity value is formed.

14 . The method of claim 13 , characterized in that step (iii) comprises cooking the composition at a temperature of 65-90° C.

15 . The method of claim 13 , characterized in that the crosslinking agent is an aldehyde.

16 . The method of claim 13 , characterized in that the polymerizable substance is selected from a group consisting of phenol, cresol, resorcinol and combinations thereof.

17 . The method of claim 13 , characterized in that the catalyst is selected from a group consisting of sodium hydroxide, potassium hydroxide and any mixture thereof.

18 . A binder composition obtainable by the method of claim 13 .

19 . An adhesive composition comprising the binder composition of claim 18 .

20 . (canceled)

21 . (canceled)

Assignees

• Upm Kymmene Corp

Inventors

• Pietarinen Suvi
• Valkonen Sanna
• Ringena Okko

Classifications

• C09J197/005

  Lignin · CPC title

• C09J161/12

  with polyhydric phenols · CPC title

• C08L97/005

  Lignin · CPC title

• C08H6/00

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

• C08G8/20

  with polyhydric phenols · CPC title