Adhesive system containing tannin for binding lignocellulosic materials

Abstract

The adhesive system for use in binding lignocellulosic materials into a composite product, the adhesive system consisting essentially of a first part and one of (a) a second part; (b) a third part, and (c) both the second part and the third part; the first part being selected from the group consisting of powdered tannins, powdered modified tannins, and mixtures thereof; the second part being a powdered component reactive with the first part and selected from the group consisting of aldehyde polymers, phenolic resoles, modified phenolic resoles, and mixtures thereof; the third part being a liquid polymeric isocyanate, wherein: when the system consists essentially of the first part and (a) the second part, the weight ratio of the first part to the second part is from about 1:99 to about 65:35; when the system consists essentially of the first part and (b) the third part, the weight ratio of the first part to the third part is from about 1:99 to about 65:35; and when the system consists essentially of the first part and (c) both the second part and the third part, the first part is present in an amount from about 1% w/w to about 64% w/w, the second part is present in an amount of from about 1% w/w to about 64% w/w and the third part is present in an amount of from about 35% w/w to about 99% w/w. A method of forming a composite product using the adhesive system and a composite product made with the adhesive system are also provided.

Dependencies are inferred from the claim text.