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US 7,452,428 B2Granted
Method for coating metal substrates with a radically polymerizable coating agent and coated substrates
AssigneeHenkel AG & Co. KGaA
InventorsMatthias Koch, Kerstin Motzkat
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Abstract
The invention relates to a method and coating agents used in the method which provide good adherence to and good corrosion protection of metal substrates; the coating coating agents are cross-linkable via radical polymerization. Adhesion promoting compounds are present in the conversion layer in a quantity of about 0.01 to 40 weight percent and contain, on average, one reactive unsaturated group and at least one H-active group per molecule.
Claims22
A method for coating a metal surface with a coating agent, comprising:
- a) optionally cleaning and/or degreasing a metal surface,
- b) applying an aqueous chromate-free conversion coating agent producing an uncrosslinked conversion layer,
- c) applying a coating agent based on binders crosslinkable by radical polymerization to the uncrosslinked conversion layer, and
- d) crosslinking the uncrossedlinked conversion layer together with the coating agent to form a crosslinked coating by radical polymerization,
- wherein the conversion layer comprises, in an amount of from 0.1 to 500 mg/m2 of surface, low molecular weight compounds which contain groups crosslinkable by radical polymerization and H-active groups.
2 more elements
A method for coating a metal substrate with a two-layer lacquer coating comprising:
- d) applying to a metal substrate an aqueous chromate-free conversion coating agent producing an crosslinkable conversion layer comprising low molecular weight compounds which contain double bonds crosslinkable by radical polymerization and H-active groups, the crosslinkable conversion layer being free of polymerization initiators;
- and
- e) applying a second crosslinkable coating layer to the crosslinkable conversion layer;
- and
- f) crosslinking the two layers together by radiation.
2 more elements
Dependencies are inferred from the claim text.