Method for treating lignin and for producing a binder composition
AssigneeUpm-Kymmene Corporation
InventorsSuvi Pietarinen, Sanna Valkonen, Okko Ringena
Life of this patent
Estimating the term…
Abstract
The invention relates to a method for treating lignin, wherein the method comprises the following steps: a) dissolving lignin into an aqueous composition, which contains a compound selected from the class of phenols, while keeping the temperature of the composition at 0-16° C.; and b) allowing the composition to react while keeping the temperature of the composition at 60-100° C. and the pH of the composition at a pH valise of 6-14. The invention relates further to a method for producing a binder composition and to different applications thereof.
Claims21
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.
An adhesive composition comprising a binder composition produced using 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, and heating the 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.
A high-pressure laminate obtainable by a method comprising:
- forming a binder composition by
- 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) subsequently 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, and heating the 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;
- impregnating at least two layers of Kraft paper with the binder composition;
- and
- fusing together the impregnated layers of Kraft paper under heating and pressure to form the high-pressure laminate.
Dependencies are inferred from the claim text.