Paint adhesion by polyvinyl amines in acidic aqueous corrosion protection product containing polymers
First Claim
1. A chromium-free, curable corrosion protection agent for the first coating of metallic substrates, the corrosion protection agent having a pH in the range of from 1 to 3 and containing water and components:
- a) fluoro complex ions of titanium and/or zirconium,b) at least one corrosion protection pigment,c) at least one organic polymer or copolymer which is water-soluble or water-dispersible in the specified pH range and which as such in aqueous solution in a concentration of 50 wt. % has a pH in a range from 1 to 3, andd) at least one polyvinyl amine comprising amino groups that are acylated, said polyvinyl amine having a molecular weight of greater than 100,000 g/mol but not greater than 1,000,000 g/mol and a degree of acylation of not less than 80%.
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Abstract
The invention relates to an aqueous, chromium-free and curable corrosion protection agent for the first coating of metal surfaces, said agent containing at least one organic polymer or copolymer of at least partially acylated vinyl amines, for improving the properties of adhesion of the cured first coating to the metallic surface and to further organic coatings. The invention also relates to a method for producing a first coating comprising the agent according to the invention, and for applying further organic coatings, in particular those based on polyurethane resins and/or based on isocyanates and diols or polyols, and to a metal strip produced in this way or a metal sheet cut off same, which can optionally be shaped.
2 Citations
13 Claims
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1. A chromium-free, curable corrosion protection agent for the first coating of metallic substrates, the corrosion protection agent having a pH in the range of from 1 to 3 and containing water and components:
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a) fluoro complex ions of titanium and/or zirconium, b) at least one corrosion protection pigment, c) at least one organic polymer or copolymer which is water-soluble or water-dispersible in the specified pH range and which as such in aqueous solution in a concentration of 50 wt. % has a pH in a range from 1 to 3, and d) at least one polyvinyl amine comprising amino groups that are acylated, said polyvinyl amine having a molecular weight of greater than 100,000 g/mol but not greater than 1,000,000 g/mol and a degree of acylation of not less than 80%. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification