N-acyl aminomethylene phosphonates and their use in...

Details N-acyl aminomethylene phosphonates and their use in... N-acyl aminomethylene phosphonates and their use in...

C - Chemistry, Metallurgy

08

F

402/353, 400/501

C08F 8/40 (2006.01) C09D 5/02 (2006.01) C09D 5/38 (2006.01)

Patent

CA 2199170

N-acyl aminomethylene phosphonates are provided having general formula (A) wherein R1 is hydrogen, an aliphatic radical having 1 to 25 carbon atoms, or an aromatic radical having 6 to 25 carbon atoms; R2 is hydrogen, an aliphatic radical having 1 to 25 carbon atoms, or an aromatic radical having 6 to 25 carbons atoms; and R3 is a group remaining after reaction of a hydroxyl group-containing or epoxy group-containing polymer with an acidic hydrogen of a group (B). Also provided are waterborne coating compositions containing metallic pigments which are normally reactive with water or moisture to release hydrogen gas, stabilized against gassing by incorporation of these N-acyl aminomethylene phosphonates into the waterborne coating compositions. (see formula I and II)

Phosphonates N-acylaminométhylène de la formule générale (A). Dans cette formule, R1 est hydrogène, un radical aliphatique comptant de 1 à 25 atomes de carbone, ou un radical aromatique comptant de 6 à 25 atomes de carbone; R2 est hydrogène, un radical aliphatique comptant de 1 à 25 atomes de carbone ou un radical aromatique comptant de 6 à 25 atomes de carbone; et R3 est un groupe restant après réaction d'un polymère contenant un groupe hydroxyl ou un groupe époxy avec un hydrogène acide du groupe de la formule (B). L'invention porte également sur des compositions de revêtement en suspension dans l'eau renfermant des pigments métalliques qui réagissent normalement à l'eau ou à l'humidité en libérant de l'hydrogène sous forme gazeuse et qui sont stabilisés contre la gazéification par incorporation de ces phosphonates N-acylaminométhylène dans les compositions de revêtement en suspension dans l'eau de cette invention.

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