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US 12,492,307 B2Granted
Process for preparing a resin
AssigneeStora Enso OYJ
InventorsBen Nasli Bakir, Ashar Zafar, Jesper Ekström, Dimitri Areskogh
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Abstract
The present invention relates to an improved process for preparing an aqueous dispersion of lignin and the use of said suspension in the preparation of a resin.
Claims11
A method for preparing a resin comprising the steps of
- a) providing an aqueous medium having a pH of 1 to 7;
- b) adding lignin to the aqueous medium;
- c) mixing at a temperature of from 41° C. to 95° C. until a dispersion of lignin in the aqueous medium has been obtained, the dispersion prepared without addition of alkali;
- d) adding alkali, phenol, and formaldehyde to the dispersion, and
- e) maintaining a mixture formed in step d) at a temperature of from 30° C. to 95° C. for at least 30 minutes.
2 more elements
Dependencies are inferred from the claim text.