α-alumina flakes
AssigneeMerck Patent GmbH
InventorsRyuta Suzuki, Gerhard Pfaff, Sabine Schoen, Fumiko Sasaki, Satoru Kobayashi, Koshiro Kunii, Yuji Takenaka, Katsuhisa Nitta
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Abstract
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.
Claims20
A coating, automobile coating, automotive finishing or industrial coating, comprising uncoated Al2O3 flakes having a thickness of ≥500 nm and a D10-value of ≤ 9.0 μm and a D50-value of 15-30 μm and a D90-value of 30-45 μm, and/or coated Al2O3 flakes having a thickness of ≥500 μm and a D10-value of ≤9.0 μm and a D50-value of 15-30 μm and a D90-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 Al2O3 flakes are α-alumina flakes.
A coating, automobile coating, automotive finishing or industrial coating, comprising coated Al2O3 flakes having a thickness of ≥500 nm and a D10-value of ≤9.0 μm and a D50-value of 15-30 μm and a D90-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 Al2O3 flakes are α-alumina flakes.
A coating, automobile coating, automotive finishing or industrial coating, comprising uncoated Al2O3 flakes having a thickness of ≥500 nm and a D10-value of ≤9.0 μm and a D50-value of 15-30 μm and a D90-value of 30-45 μm, and/or coated Al2O3 flakes having a thickness of ≥500 nm and a D10-value of ≤9.0 μm and a D50-value of 15-30 μm and a D90-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 Al2O3 flakes, and wherein the coated and/or uncoated Al2O3 flakes are α-alumina flakes.
Dependencies are inferred from the claim text.