The utilization of kraft lignin in phenol/formaldehyde...

C - Chemistry – Metallurgy – 08 – L

Patent

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C08L 61/06 (2006.01) C08K 3/22 (2006.01) C08K 5/21 (2006.01) C08L 97/00 (2006.01) C08L 97/02 (2006.01)

Patent

CA 2721490

A resin for OSB comprising an aqueous resole reaction product of phenol, formaldehyde, alkaline metal hydroxide or carbonate, urea and a degraded lignin polymer having 35-65% solids, a pH of 8-13 and a viscosity 50-1000 centipoises. The phenol and formaldehyde are present in a molar ratio of 1.5 to 3.4 moles formaldehyde to 1 mole phenol and are 40 to 85% of the total solids added to the mixture. In one embodiment they are 50 to 75% of the total solids added to the mixture. The alkaline metal hydroxide or carbonate are 5 to 20% of the total solids added to the mixture. Urea is 5 to 35% of the total solids added to the mixture. The degraded lignin is 5 to 20% of the total solids added to the mixture. A method for making the resin and a product using the resin.

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