α-alumina flakes
US-10647861-B2 · May 12, 2020 · US
α-alumina flakes
US11142649B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11142649-B2 |
| Application number | US-201916460292-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jul 2, 2019 |
| Priority date | Apr 30, 2013 |
| Publication date | Oct 12, 2021 |
| Grant date | Oct 12, 2021 |
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- Title
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Abstract
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The present invention relates to alumina flakes having a defined thickness and particle size distribution and to their use in varnishes, paints, automotive coatings printing inks, masterbatches, plastics and cosmetic formulations and as substrate for effect pigments. and organic dyes.
First claim
Opening claim text (preview).
The invention claimed is: 1. A coating, automobile coating, automotive finishing or industrial coating, comprising uncoated Al 2 O 3 flakes having a thickness of ≥500 nm and a D 10 -value of ≤ 9.0 μm and a D 50 -value of 15-30 μm and a D 90 -value of 30-45 μm, and/or coated Al 2 O 3 flakes having a thickness of ≥500 μm and a D 10 -value of ≤9.0 μm and a D 50 -value of 15-30 μm and a D 90 -value of 30-45 μm, which have been coated with a coating selected from the group consisting of at least one layer of a metal oxide, mixtures of at least two metal oxides, metal, metal sulphide, titanium suboxide, titanium oxynitride, FeO(OH), metal alloys and rare earth compounds, and wherein the coated and/or uncoated Al 2 O 3 flakes are α-alumina flakes. 2. The coating, automobile coating, automotive finishing or industrial coating according to claim 1 , wherein the coated and/or uncoated Al 2 O 3 flakes have a D 10 -value of 9.0 μm. 3. The coating, automobile coating, automotive finishing or industrial coating according to claim 1 , wherein the coated and/or uncoated Al 2 O 3 flakes have a D 90 -value of 30-40 μm. 4. The coating, automobile coating, automotive finishing or industrial coating according to claim 1 , wherein the coated and/or uncoated Al 2 O 3 flakes have a particle thickness of 550-1000 nm. 5. The coating, automobile coating, automotive finishing or industrial coating according to claim 1 , wherein the coated and/or uncoated Al 2 O 3 flakes have been doped with a dopant selected from the group consisting of TiO 2 , ZrO 2 , SiO 2 , SnO 2 , In 2 O 3 , ZnO and combinations thereof. 6. The coating, automobile coating, automotive finishing or industrial coating according to claim 5 , wherein the amount of doping is 0.01-5% by weight based on the total weight of the Al 2 O 3 flake. 7. The coating, automobile coating, automotive finsihing or industrial coating according to claim 5 , wherein the coated and/or uncoated Al 2 O 3 flakes have been doped with TiO 2 . 8. The coating, automobile coating, automotive finishing or industrial coating according to claim 1 , which contain the Al 2 O 3 flakes coated with a coating selected from the group consisting of at least one layer of a metal oxide, mixtures of at least two metal oxides, metal, metal sulphide, titanium suboxide, titanium oxynitride, FeO(OH), metal alloys and rare earth compounds. 9. The coating, automobile coating, automotive finishing or industrial coating according to claim 1 , wherein the Al 2 O 3 flakes have been coated with at least one layer of a metal oxide or a mixture of at least two metal oxides. 10. The coating, automobile coating, automotive finishing or industrial coating according to claim 1 , wherein the Al 2 O 3 flakes have been coated with the following layer sequence: Al 2 O 3 flake+TiO 2 Al 2 O 3 flake+TiO 2 /Fe 2 O 3 Al 2 O 3 flake+Fe 2 O 3 Al 2 O 3 flake+TiO 2 +Fe 2 O 3 Al 2 O 3 flake+TiO 2 +Fe 3 O 4 Al 2 O 3 flake+TiO 2 +SiO 2 +TiO 2 Al 2 O 3 flake+Fe 2 O 3 +SiO 2 +TiO 2 Al 2 O 3 flake+TiO 2 /Fe 2 O 3 +SiO 2 +TiO 2 Al 2 O 3 flake+TiO 2 +SiO 2 +TiO 2 /Fe 2 O 3 Al 2 O 3 flake+TiO 2 +SiO 2 Al 2 O 3 flake+TiO 2 +SiO 2 /Al 2 O 3 Al 2 O 3 flake+TiO 2 +Al 2 O 3 Al 2 O 3 flake+SnO 2 Al 2 O 3 flake+SnO 2 +TiO 2 Al 2 O 3 flake+SnO 2 +Fe 2 O 3 Al 2 O 3 flake+SiO 2 Al 2 O 3 flake+SiO 2 +TiO 2 Al 2 O 3 flake+SiO 2 +TiO 2 /Fe 2 O 3 Al 2 O 3 flake+SiO 2 +Fe 2 O 3 Al 2 O 3 flake+SiO 2 +TiO 2 +Fe 2 O 3 Al 2 O 3 flake+SiO 2 +TiO 2 +Fe 3 O 4 Al 2 O 3 flake+SiO 2 +TiO 2 +SiO 2 +TiO 2 Al 2 O 3 flake+SiO 2 +Fe 2 O 3 +SiO 2 +TiO 2 Al 2 O 3 flake+SiO 2 +TiO 2 /Fe 2 O 3 +SiO 2 +TiO 2 Al 2 O 3 flake+SiO 2 +TiO 2 +SiO 2 +TiO 2 /Fe 2 O 3 Al 2 O 3 flake+SiO 2 +TiO 2 +SiO 2 Al 2 O 3 flake+SiO 2 +TiO 2 +SiO 2 /Al 2 O 3 Al 2 O 3 flake+SiO 2 +TiO 2 +Al 2 O 3 Al 2 O 3 flake+TiO 2 +Prussian Blue or Al 2 O 3 flake+TiO 2 +Carmine Red. 11. The coating, automobile coating, automotive finishing or industrial coating according to claim 1 , wherein the Al 2 O 3 flakes have been coated with TiO 2 in the rutile or anatase modification. 12. The coating, automobile coating, automotive finishing or industrial coating according to claim 1 , wherein the Al 2 O 3 flakes have been coated with TiO 2 in the rutile modification. 13. The coating, automobile coating, automotive finishing or industrial coating according to claim 1 , wherein the coated Al 2 O 3 flakes consist of 40-90 wt. % of Al 2 O 3 flakes and 10-60 wt. % of the coating based on the total weight of the Al 2 O 3 flake. 14. The coating, automobile coating, automotive finishing or industrial coating according to claim 1 , which is a one coat system which has a single-layer coating. 15. The coating, automobile coating, automotive finishing or industrial coating according to claim 1 , which is a two-coat system. 16. The coating, automobile coating, automotive finishing or industrial coating according to claim 1 , wherein the coating, automobile coating, automotive finishing or industrial coating contains 0.01 to 50% by weight of the coated and/or uncoated Al 2 O 3 flakes. 17. A base coat in a two-coat system, wherein the base coat is a coating, automobile coating, automotive finishing or industrial coating according to claim 1 . 18. A coating, automobile coating, automotive finishing or industrial coating, comprising coated Al 2 O 3 flakes having a thickness of ≥500 nm and a D 10 -value of ≤9.0 μm and a D 50 -value of 15-30 μm and a D 90 -value of 30-45 μm, which have been coated with a coating selected from the group consisting of at least one layer of a metal oxide, mixtures of at least two metal oxides, metal, metal sulphide, titanium suboxide, titanium oxynitride, FeO(OH), metal alloys and rare earth compounds, wherein the coated and/or uncoated Al 2 O 3 flakes are α-alumina flakes. 19. A coating, automobile coating, automotive finishing or industrial coating, comprising uncoated Al 2 O 3 flakes having a thickness of ≥500 nm and a D 10 -value of ≤9.0 μm and a D 50 -value of 15-30 μm and a D 90 -value of 30-45 μm, and/or coated Al 2 O 3 flakes having a thickness of ≥500 nm and a D 10 -value of ≤9.0 μm and a D 50 -value of 15-30 μm and a D 90 -value of 30-45 μm, which have been coated with a coating selected from the group consisting of at least one layer of a metal oxide, mixtures of at least two metal oxides, metal, metal sulphide, titanium suboxide, titanium oxynitride, FeO(OH), metal alloys and rare earth compounds, wherein the coating, automobile coating, automotive finishing or industrial coating contains 0.5 to 10% by weight the coated and/or uncoated Al 2 O 3 flakes, and wherein the coated and/or uncoated Al 2 O 3 flakes are α-alumina flakes. 20. The coating, auntombile coating, automotive finishing or industrial coating according to claim 19 , wherein the coated and/or uncoated Al 2 O 3 flakes have a D 10 -value of 9.0 μm.
Assignees
Inventors
Classifications
characterised by shape, e.g. fibres, flakes or microspheres · CPC title
inorganic · CPC title
Thickness of the core · CPC title
the core comprising at least one inorganic oxide, e.g. Al2O3, TiO2 or SiO2 · CPC title
Coating · CPC title
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Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US11142649B2 cover?
- The present invention relates to alumina flakes having a defined thickness and particle size distribution and to their use in varnishes, paints, automotive coatings printing inks, masterbatches, plastics and cosmetic formulations and as substrate for effect pigments. and organic dyes.
- Who is the assignee on this patent?
- Merck Patent Gmbh
- What technology area does this patent fall under?
- Primary CPC classification C09C1/407. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Oct 12 2021 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 5 related publications on this page (citations in our corpus or others sharing the same primary CPC).