α-alumina flakes
AssigneeMerck Patent GmbH
InventorsRyuta Suzuki, Gerhard Pfaff, Sabine Schoen, Noriyuki Matsuda, Katsuhisa Nitta
Life of this patent
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Abstract
Alpha-Alumina flakes having a particle thickness of 130-400 nm, a D50-value of 15-30 μm, a D90-value of 30-45 μm and a D10-value of <9.5 μm. Use of the alumina flakes in varnishes, paints, automotive coatings printing inks, masterbatches, plastics and cosmetic formulations. Also, use of the alumina flakes as a substrate for effect pigments and in organic dyes.
Claims21
A blended composition of at least two distinct separate ingredients (1) and (2),
- comprising
- (1) coated and/or uncoated Al2O3 flakes having a particle thickness of 130-400 nm, D50-value of 15-30 μm, D90-value of 30-45 μm and a D10-value of <9.5 μm, wherein the coated Al2O3 flakes have one or more coatings on top of and completely encapsulating said Al2O3 flakes and forming one or more layers apart from the Al2O3 flakes, wherein said Al2O3 flakes are alpha-alumina flakes,
- and
- (2) one or more further distinct ingredients apart from said coated and/or uncoated Al2O3 flakes, which are one or more organic dyes, organic pigments, transparent pigments, opaque white pigments, colored pigments, black pigments, flake-form iron oxides, holographic pigments, liquid crystal polymers, or transparent, colored or black luster pigments based on metal oxide-coated mica or SiO2 flakes or fillers,
- and
- wherein the at least two distinct separate ingredients (1) and (2) form said blended composition.
A method for the laser marking of paper or a plastic or for the coloring of a tent awning, comprising applying to said paper, plastic or tent awning a blended composition of at least two distinct separate ingredients (1) and (2),
- said at least two distinct separate ingredients (1) and (2) comprising
- (1) coated and/or uncoated Al2O3 flakes having a particle thickness of 130-400 nm, D50-value of 15-30 μm, D90-value of 30-45 μm and a D10-value of <9.5 μm, wherein the coated Al2O3 flakes have one or more coatings on top of and completely encapsulating said Al2O3 flakes and forming one or more layers apart from the Al2O3 flakes, wherein said Al2O3 flakes are alpha-alumina flakes,
- and
- (2) one or more further distinct ingredients apart from said coated and/or uncoated Al2O3 flakes, which are one or more organic dyes, organic pigments, transparent pigments, opaque white pigments, colored pigments, black pigments, flake-form iron oxides, holographic pigments, liquid crystal polymers, or transparent, colored or black luster pigments based on metal oxide-coated mica or SiO2 flakes or fillers,
- and
- wherein the at least two distinct separate ingredients (1) and (2) form said blended composition.
Dependencies are inferred from the claim text.