Electrocoating compositions containing polyvinylpyrrolidone...

Details Electrocoating compositions containing polyvinylpyrrolidone... Electrocoating compositions containing polyvinylpyrrolidone...

C - Chemistry, Metallurgy

09

D

C09D 5/44 (2006.01)

Patent

CA 2370319

Disclosed are electrodepositable coating compositions containing a polymer prepared from the polymerization of an ethylenically unsaturated monomer having a heterocyclic ring containing at least one ring nitrogen atom bonded to a vinyl group or a mixture of monomers comprised of such a monomer, the compositions further including contaminants capable of forming defects in the electrodeposited coating surface. The polymer is present in an amount effective to abate formation of the surface defects caused by the contaminants. A method of electrocoating a conductive substrate using the electrodepositable coating compositions of the invention is also disclosed.

La présente invention concerne des compositions d'électrodéposition contenant un polymère préparé par polymérisation d'un monomère à insaturation éthylénique comportant un hétérocycle à au moins un atome d'azote cyclique lié à un groupe vinyle, ou un mélange de monomères contenant un tel monomère. Ces compositions contiennent aussi des contaminants pouvant mener à la formation de défauts dans le revêtement de surface obtenu par électrodéposition. Le polymère présent en quantité effective permet d'éviter la formation de défauts dus à la présence de contaminants. L'invention concerne aussi un procédé d'électrodéposition sur un substrat conducteur à l'aide des compositions d'électrodéposition décrites.

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