Use of low molecular weight lignin together with lignin for the production of a phenol-formaldehyde binder composition
AssigneeUpm-Kymmene Corporation
InventorsSanna Valkonen, Suvi Pietarinen, Okko Ringena, Kati Eskelinen
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Abstract
The present invention relates to a method for producing a binder composition, wherein the method comprises the following steps: (i) forming an aqueous composition comprising reactant components including lignin molecules of 11-60 lignin units, lignin molecules of 1-10 lignin units, polymerizable substance and crosslinking agent in the presence of a catalyst; and (ii) cooking the composition at a temperature of 60-95° C. for polymerizing the reactant components until a binder composition with a predetermined viscosity value is formed.
Claims25
A method for producing a binder composition, wherein the method comprises the following steps:
- (i) forming an aqueous composition comprising reactant components including lignin molecules of 11-60 lignin units, lignin molecules of 1-10 lignin units, polymerizable substance, and crosslinking agent in the presence of a catalyst, wherein the weight ratio of the lignin molecules of 11-60 lignin units to the lignin molecules of 1-10 lignin units is 0.1-20;
- and
- (ii) cooking the aqueous composition at a temperature of 45-95° C. for polymerizing the reactant components until a binder composition with a predetermined viscosity value is formed.
Dependencies are inferred from the claim text.