Aqueous polyurethane dispersions and coatings prepared...

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/08 (2006.01) C08G 18/12 (2006.01) C08G 18/58 (2006.01) C09D 175/04 (2006.01)

Patent

CA 2306120

The present invention is directed to two- and three-component aqueous polyurethane composition which are cured at ambient temperature and have excellent chemical resistance without reduction in abrasion resistance and flexibility. The two component system comprises a first component of a hydroxy functional aqueous polyurethane dispersion and phenoxy resin blended together, and a second component of polyisocyanate. The three component system comprises a first component of a hydroxy functional aqueous polyurethane dispersion, a second component of epoxy resin; and a third component of polyisocyanate. Generally, the mass of the epoxy or phenoxy resins is 1 to 50 % of mass of the polyurethane solids in the dispersion and the mass of the polyisocyanate is 50 to 200 % of the mass of the polyurethane solids in the dispersion. The two- or three-component polyurethane composition has a mass fraction of solids of preferably 10-50 %.

La présente invention concerne une composition aqueuse de polyuréthanne à deux et à trois composants, durcis à température ambiante et présentant une excellente résistance chimique sans réduction de leur résistance à l'abrasion et de leur flexibilité. Le système à deux composants comprend un premier composant d'une dispersion de polyuréthanne aqueuse fonctionnelle hydroxy et de résine phénoxy mélangées ensemble, et un second composant de polyisocyanate. Ce système comprend un premier composant d'une dispersion de polyuréthanne aqueuse fonctionnelle hydroxy, un second composant de résine époxy, et un troisième composant de polyisocyanate. Généralement, la masse des résines époxy est comprise entre 1 et 50 % de la masse des extraits de polyuréthanne dans la dispersion, et la masse du polyisocyanate est comprise entre 50 et 200 % de la masse des extraits de polyuréthanne dans la dispersion. Par ailleurs, la composition à deux ou trois composants présente, de préférence, une fraction de masse des extraits de 10-50 %.

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