Polyurethane coating compositions

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C - Chemistry, Metallurgy

08

G

C08G 18/00 (2006.01) C08G 18/08 (2006.01) C08G 18/22 (2006.01) C08G 18/32 (2006.01) C08G 18/38 (2006.01) C08J 3/00 (2006.01) C08K 3/20 (2006.01) C08L 75/00 (2006.01) C09D 175/04 (2006.01) C09D 175/06 (2006.01) C11D 7/08 (2006.01)

Patent

CA 2473795

A coating composition containing a polyisocyanata compound having an isocyanate functionally of greater than 1, a polyol compound having an average hydroxyl functionality of greater than 1, wherein the relative amounts of polyisocyanate compound and polyol compound are in an amount effective to provide from 0.5 to 1.5 equivalents of isocyanate groups per equivalent of hydroxyl groups, from 0.0002 to 5 parts by weight of an organometallic curing catalyst selected from organobismuth, organozirconium or organoaluminum curing catalysts per 100 parts by weight of the polyisocyanate compond and from 0.0001 to 2.5 parts by weight of a moisture scavenger per 100 parts by weight of the polyisocyanate compound exhibits improved resistance to surface imperfections due to the phenomenon of "solvent popping".

L'invention concerne une composition d'enrobage contenant un composé polyisocyanate ayant une fonctionnalité isocyanate supérieure à 1, un composé polyol ayant une fonctionnalité hydroxyle moyenne supérieure à 1. Les quantités relatives des composés polyisocyanate et polyol sont suffisantes pour obtenir de 0,5 à 1,5 équivalents de groupes isocyanates par équivalent de groupes hydroxyles, de 0,0002 à 5 parties en poids d'un catalyseur de durcissement organométallique choisi dans le groupe comprenant les catalyseurs de durcissement à base d'organobismuth, d'organozirconium ou d'organoaluminium pour 100 parties en poids du composé polyisocyanate. Cette composition d'enrobage présente une meilleure résistance aux imperfections superficielles provoquées par le phénomène de bullage.

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