Oil based aqueous polyurethane dispersions

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/36 (2006.01) C08G 18/08 (2006.01) C08G 18/12 (2006.01) C08G 18/32 (2006.01) C08G 18/34 (2006.01) C08G 18/42 (2006.01) C08G 18/66 (2006.01) C09D 175/14 (2006.01)

Patent

CA 2649376

A two-pack coating composition comprising curing agents selected from the group consisting of non-blocked polyfunctional isocyanates I, polyaziridines Z, and carbodiimides Y, and an aqueously dispersed polyurethane U wherein the polyurethane U comprises building blocks derived from hydroxyl group containing unsaturated fatty acids B21, a process for the production of the polyurethane U, and a method of use thereof in combination with the said curing agents in preparing coating compositions which are particularly useful for wood.

Composition de revêtement à deux composants comprenant des agents de réticulation sélectionnés dans le groupe composé d'isocyanates I polyfonctionnels non bloqués, de polyaziridines Z et de carbodiimides Y, et un polyuréthane U en dispersion aqueuse. Le polyuréthane U comprend des synthons dérivés du groupe hydroxyle contenant des acides gras insaturés B21. L'invention concerne aussi un processus pour la production du polyuréthane U et un procédé d'utilisation de celui-ci en combinaison avec lesdits agents de réticulation dans la préparation de compositions de revêtement qui sont particulièrement utiles pour le bois.

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