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US 5,624,486 AGranted
Multiply coated metallic luster pigments
AssigneeBASF SE
InventorsRaimund Schmid, Norbert Mronga
Life of this patent
Estimating the term…
Abstract
Luster pigments based on multiply coated plateletlike metallic substrates comprising A) a first layer consisting essentially of silicon oxide, aluminum oxide and/or aluminum oxide hydrate, B) a second layer consisting essentially of metal and/or nonselectively absorbing metal oxide, and C) if desired, a third layer consisting essentially of colorless or selectively absorbing metal oxide.
Claims10
Luster pigments based on multiply coated platelet-shaped metallic substrates comprising
- A) a first layer consisting essentially of silicon oxide, silicon oxide hydrate, aluminum oxide and/or aluminum oxide hydrate,
- B) a second layer consisting essentially of metal and/or nonselectively absorbing metal oxide, and
- C) if desired, a third layer consisting essentially of colorless or selectively absorbing metal oxide,
- obtainable by
- a) wet-chemical coating of the substrate particles with silicon oxide, silicon oxide hydrate, aluminum oxide and/or aluminum oxide hydrate by hydrolytic decomposition of organic silicon and/or aluminum compounds in which the organic radicals are attached to the metals via oxygen atoms in the presence of an organic solvent in which the metal compounds are soluble with or without subsequent drying,
- b) further coating of the particles obtained in step a) with metal by
- b1) gas phase decomposition of volatile metal compounds in an inert atmosphere or
- b2) electroless, wet-chemical metal deposition with or without subsequent drying
- or with nonselectively absorbing metal oxide by
- b3) gas phase decomposition of volatile metal compounds in the presence of oxygen and/or water vapor and
- c) if desired additional coating of the particles obtained in step b) with colorless or selectively absorbing metal oxide by
- c1) gas phase decomposition of volatile metal compounds in the presence of oxygen and/or water vapor or
- c2) wet-chemical coating by hydrolytic decomposition of organic metal compounds in which the organic radicals are attached to the metals via oxygen atoms in the presence of an organic solvent in which the metal compounds are soluble and subsequent drying.
10 more elements
Luster pigments based on multiply coated platelet-shaped substrates consisting essentially of aluminum comprising
- A) a first layer from 50 to 600 nm in thickness consisting essentially of silicon oxide,
- B) a second layer from 1 to 25 nm in thickness consisting essentially of molybdenum, chromium, tungsten and/or iron, and
- C) if desired, a third layer from 5 to 250 nm in thickness consisting essentially of silicon oxide, silicon oxide hydrate, aluminum oxide and/or aluminum oxide hydrate.
A process for preparing luster pigments based on multiply coated platelet-shaped metallic substrates comprising
- A) a first layer consisting essentially of silicon oxide, aluminum oxide and/or aluminum oxide hydrate,
- B) a second layer consisting essentially of metal and/or nonselectively absorbing metal oxide, and
- C) if desired, a third layer consisting essentially of colorless or selectively absorbing metal oxide, which comprises the steps of:
- a) wet-chemical coating of the substrate particles with silicon oxide, aluminum oxide and/or aluminum oxide hydrate by hydrolytic decomposition of organic silicon and/or aluminum compounds in which the organic radicals are attached to the metals via oxygen atoms in the presence of an organic solvent in which the metal compounds are soluble with or without subsequent drying,
- b) further coating of the particles obtained in step a) with metal by
- b1) gas phase decomposition of volatile metal compounds in an inert atmosphere or
- b2) electroless, wet-chemical metal deposition with or without subsequent drying
- or with nonselectively absorbing metal oxide by
- b3) gas phase decomposition of volatile metal compounds in the presence of oxygen and/or water vapor and
- c) if desired additional coating of the particles obtained in step b) with colorless or selectively absorbing metal oxide by
- c1) gas phase decomposition of volatile metal compounds in the presence of oxygen and/or water vapor or
- c2) wet-chemical coating by hydrolytic decomposition of organic metal compounds in which the organic radicals are attached to the metals via oxygen atoms in the presence of an organic solvent in which the metal compounds are soluble and subsequent drying.
9 more elements
A process for producing mixtures of luster pigments based on multiply coated platelet-shaped metallic substrates comprising
- I) luster pigments of:
- A) a first layer consisting essentially of silicon oxide, silicon oxide hydrate, aluminum oxide and/or aluminum oxide hydrate,
- B) a second layer consisting essentially of metal and/or nonselectively absorbing metal oxide, and
- C) if desired, a third layer consisting essentially of colorless or selectively absorbing metal oxide, and
- II) multiply coated silicatic substrate platelets comprising
- A') a first layer consisting essentially of colorless or selectively absorbing metal oxide,
- B') a second layer consisting essentially of metal and/or nonselectively absorbing metal oxide, and
- C') if desired, a third-layer consisting essentially of colorless or selectively absorbing metal oxide,
- as essential components, comprising the steps of:
- coating the metallic platelet-shaped substrates coated with layer A and the silicatic substrate platelet coated with layer A') conjointly by
- b1) gas phase decomposition of volatile metal compounds in an inert atmosphere or
- b2) electroless, wet-chemical metal deposition with or without subsequent drying, with metal, or by
- b3) gas phase decomposition of volatile metal compounds in the presence of oxygen and/or water vapor, with colorless or selectively absorbing metal oxide, and if desired additionally by
- c1) gas phase decomposition of volatile metal compounds in the presence of oxygen and/or water vapor or by
- c2) hydrolytic decomposition of organic metal compounds in which the organic radicals are attached to the metals via oxygen atoms in the presence of an organic solvent in which the metal compounds are soluble and subsequent drying, with colorless or selectively absorbing metal oxide.
12 more elements
Dependencies are inferred from the claim text.