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US 10,246,619 B2Granted
Method for increasing the reactivity of lignin
AssigneeUpm-Kymmene Corporation
InventorsSuvi Pietarinen, Okko Ringena, Kati Eskelinen, Sanna Valkonen
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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.
Claims7
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;
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- (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.
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Dependencies are inferred from the claim text.