Method for increasing the reactivity of lignin
AssigneeUpm-Kymmene Corporation
InventorsSuvi Pietarinen, Sanna Valkonen, Okko Ringena
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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 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.
Claims17
A method for producing a binder composition, the method comprising:
- a) forming, under heating at a temperature of 76-94° 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 akalated lignin;
- and
- c) cooking an aqueous composition comprising reactant components including lignin from step b) 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.
A binder composition prepared by a process comprising the steps of:
- a) forming, under heating at a temperature of 76-94° 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;
- and
- c) cooking an aqueous composition comprising reactant components including lignin from step b), 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.
An adhesive composition comprising a binder composition prepared by a process comprising the steps of:
- a) forming, under heating at a temperature of 76-94° 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;
- and
- c) cooking an aqueous composition comprising reactant components including lignin from step b), 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.
Dependencies are inferred from the claim text.