Patent ID: 11891410
Assignee: UPM-KYMMENE CORPORATION
Field: Biotechnology (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. A binder composition obtainable by a method comprising:
a) dissolving lignin into an aqueous composition, which includes a compound selected from the class of phenols, while keeping the temperature of the composition at 0-60° C. and the pH of the composition at a pH value of 4-9.5, the lignin being kraft lignin;
b) allowing the dissolved lignin from step a) to react with the compound selected from the class of phenols and to react with alkali, wherein the alkali comprises a hydroxide of an alkali metal, while keeping the temperature of the composition at 60-100° C. and the pH of the composition at a pH value of 6-9.5 for alkalating lignin; and
c) adding a cross-linking agent to the composition formed in step b), mixing the crosslinking agent and the composition formed in step b) to form a mixture, with a crosslinking agent and heating the composition mixture at a temperature of 60-100° C. while keeping the pH of the composition at a pH value of 6-9.5 for polymerizing the lignin, the compound selected from the class of phenols, and the crosslinking agent.