Two-part polyurethane adhesives for structural finger joints...

C - Chemistry – Metallurgy – 09 – J

Patent

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C09J 175/04 (2006.01) B32B 21/00 (2006.01) B32B 21/14 (2006.01) B32B 27/12 (2006.01) C08G 18/10 (2006.01) C08L 101/00 (2006.01) C09J 5/00 (2006.01)

Patent

CA 2467396

One aspect of the present invention is an adhesive composition formed from two packs. One packs includes an isocyanate-functional prepolymer formed by reacting a polyisocyanate with an alcohol ( e.g., polyol). The isocyanate equivalents from the polyisocyanate exceed the hydroxyl equivalents from the alcohol. The second pack is an aqueous polymer emulsion. These two packs are combined to form the novel adhesive composition. Another aspect of the invention is a method for joining together two surfaces of wood products by application of an adhesive thereto. The first step in this method is to mist with water the wood product surfaces to be joined. An adhesive composition then is applied to the misted wood product surfaces. Alternatively, the water misting can be replaced with an aqueous emulsion being part of the adhesive composition. Finally, the adhesive composition is cured.

La présente invention concerne une composition adhésive formée à partir de deux ensembles. Le premier ensemble comprend un prépolymère fonctionnel isocyanate produit par la réaction d'un polyisocyanate avec un alcool (tel que le polyol). Les équivalents isocyanates du polyisocyanate sont plus nombreux que les équivalents hydroxyles de l'alcool. Le second ensemble est une émulsion polymère aqueuse. Ces deux ensembles sont combinés pour former la nouvelle composition adhésive. Cette invention concerne en outre un procédé permettant de coller deux surfaces d'articles en bois et consistant à appliquer un adhésif sur ces surfaces. La première étape de ce procédé consiste à vaporiser les surfaces des articles en bois devant être rattachées avec de l'eau. Une composition adhésive est ensuite appliquée sur les surfaces vaporisées de l'article en bois. Dans une variante, la vaporisation d'eau peut être remplacée par une émulsion aqueuse incorporée à la composition adhésive. La composition adhésive est ensuite durcie.

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