Improved color stability of isocyanates

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/16 (2006.01) C08G 18/06 (2006.01) C08K 5/00 (2006.01) C08L 75/04 (2006.01) C09D 175/04 (2006.01) C09K 15/08 (2006.01) C09K 15/18 (2006.01)

Patent

CA 2532294

A hardener composition for use as a component of a two component polyurethane coating composition, comprising a polyisocyanate, a catalyst for promoting reaction of the polyisocyanate with a reactive hydrogen compound, and one or more antioxidants selected from: a first antioxidant comprising one or more of sterically hindered phenol antioxidants and secondary aryl amine antioxidants, and a second antioxidant comprising one or more organophosphite antioxidant, exhibits improved color stability.

La présente invention concerne une composition de durcissement destinée à être utilisée en tant que constituant d'une composition de revêtement au polyuréthanne à deux constituants qui renferme un polyisocyanate, un catalyseur qui favorise la réaction du polyisocyanate avec un composé hydrogène réactif et un ou plusieurs antioxydants sélectionnés parmi: un premier antioxydant comprenant un ou plusieurs antioxydants phénol stériquement empêché et des antioxydants aryl amine secondaires, et un deuxième antioxydant comprenant un ou plusieurs antioxydants organophosphite. Cette composition présente une meilleure solidité de la couleur.

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