Coated Pigments, Method for the Production and the Use Thereof, Coating Agent and Article
AssigneeEckart GmbH
InventorsSimone Stein-Hofmann, Oliver Bedford, Oliver Struck, Ralph Schneider
Life of this patent
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Abstract
The present invention relates to a particularly effective protective coating for metallic objects, the coating method, and the special applications thereof. The particularly high protective effect is achieved by the adaptation of the inorganic fraction and the organic polymer fraction of the coating to the specific surface of the object. Further adjustments of the coating can be used for further optimization, for example of the protection properties or other product properties.
Claims20
A pigment comprising a metallic substrate and at least one inorganic/organic hybrid layer,
- wherein the inorganic/organic hybrid layer comprises at least one metal oxide, at least one network former, and at least one organic polymer,
- wherein the at least one metal oxide does not constitute an oxidation product of the metallic substrate, and the term “metal oxide” comprises oxides, hydroxides, and oxide hydrates of the metals and semimetals,
- wherein the network former is joined at least partially covalently to the metal oxide and to the organic polymer,
- wherein the ratio of the amount of metal oxide of the inorganic/organic hybrid layer to the specific surface area of the uncoated metal pigment is in a range from 16.1 mg/m2 to 25 mg/m2, and
- the ratio of the amount of organic polymer of the inorganic/organic hybrid layer to the specific surface area of the uncoated metal pigment is in a range from 3.9 mg/m2 to 10.1 mg/m2.
A method for producing metal pigments comprising metallic substrate and coating, comprising the following steps:
- i) reacting at least one metal oxide reactant, at least one reactant of an organic polymer, and at least one network former in a liquid phase to form a coating composition,
- ii) applying the coating composition to metallic substrates to form an inorganic/organic hybrid layer,
- wherein the inorganic/organic hybrid layer comprises at least one inorganic network comprising at least one metal oxide and at least one organic polymer, and the inorganic network and the organic polymer are joined covalently to one another,
- the at least one metal oxide does not constitute an oxidation product of the metallic substrate, and the term “metal oxide” comprises oxides, hydroxides, and oxide hydrates of the metals and semimetals,
- the network former is joined at least partially to the metal oxide and to the organic polymer,
- the ratio of the amount of metal oxide of the inorganic/organic hybrid layer to the specific surface area of the uncoated metal pigment is in a range from 16.1 mg/m2 to 25 mg/m2, and
- the ratio of the amount of organic polymer of the inorganic/organic hybrid layer to the specific surface area of the uncoated metal pigment is in a range from 3.9 mg/m2 to 10.1 mg/m2.
Dependencies are inferred from the claim text.