ALPHA-ALUMINA FLAKES
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.
1 - 16 . (canceled)
17 . An automobile coating, automotive finishing or industrial coating, comprising coated and/or uncoated Al 2 O 3 flakes having a particle thickness of less than 500 nm and a D 50 -value of 15-30 μm and a D 90 -value of 30-45 μm and one or more further ingredients suitable for an automobile coating, automotive finishing or industrial coating.
18 . An automobile coating, automotive finishing or industrial coating according to claim 17 , which is a single layer coating or a two-coat system in which the coated and/or uncoated Al 2 O 3 flakes are present in a base coat.
19 . An automobile coating, automotive finishing or industrial coating according to claim 17 , wherein the coated and/or uncoated Al 2 O 3 flakes are present in an amount of 0.5 to 10% by weight based on the weight of the automobile coating, automotive finishing or industrial coating.
20 . An automobile coating, automotive finishing or industrial coating according to claim 17 , wherein the Al 2 O 3 flakes have a particle thickness of 130-400 nm and a D 50 -value of 15-30 μm and a D 90 -value of 30-45 μm and a D 10 -value of <9.5 μm.
21 . An automobile coating, automotive finishing or industrial coating according to claim 17 , wherein the Al 2 O 3 flakes are α-alumina flakes.
22 . An automobile coating, automotive finishing or industrial coating according to claim 17 , wherein the Al 2 O 3 flakes have a standard deviation of thickness distribution of less than 80 nm.
23 . An automobile coating, automotive finishing or industrial coating according to claim 17 , wherein the Al 2 O 3 flakes are doped with TiO 2 , ZrO 2 , SiO 2 , SnO 2 , In 2 O 3 , or ZnO or a combination thereof.
24 . An automobile coating, automotive finishing or industrial coating according to claim 17 , wherein the Al 2 O 3 flakes are coated with at least one layer of a metal oxide, a mixture of at least two metal oxides, a metal, a metal sulphide, a titanium suboxide, a titanium oxynitride, FeO(OH), SiO 2 , a metal alloy or a rare earth compound, which form one or more coatings.
25 . An automobile coating, automotive finishing or industrial coating according to claim 17 , wherein the Al 2 O 3 flakes are coated with at least one layer of a metal oxide or a mixture of at least two metal oxides.
26 . An automobile coating, automotive finishing or industrial coating according to claim 17 , wherein the Al 2 O 3 flakes are 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.
27 . An automobile coating, automotive finishing or industrial coating according to claim 17 , wherein the Al 2 O 3 flakes are coated with TiO 2 in the rutile modification.
28 . An automobile coating, automotive finishing or industrial coating according to claim 17 , wherein the Al 2 O 3 flakes are coated with TiO 2 in the anatase modification.
29 . An automobile coating, automotive finishing or industrial coating according to claim 17 , wherein the Al 2 O 3 flakes are coated, and which coated flakes consist of 40-90 wt. % of Al 2 O 3 flakes and 10-60 wt. % of the one or more coatings.
30 . An automobile coating, automotive finishing or industrial coating according to claim 17 , wherein the Al 2 O 3 flakes have a D 10 -value of <9.2 am.
31 . An automobile coating, automotive finishing or industrial coating according to claim 17 , wherein the Al 2 O 3 flakes have a D 10 -value of 8.8 to 9.2 am.
32 . An automobile coating, automotive finishing or industrial coating according to claim 17 , wherein the Al 2 O 3 flakes have a particle thickness of 200-250 nm.
33 . An automobile coating, automotive finishing or industrial coating according to claim 17 , wherein the Al 2 O 3 flakes have a particle thickness of 130-400 nm and a D 50 -value of 15-30 μm and a D 90 -value of 30-45 μm and a D 10 -value of 8.8 to <9.5 am.
34 . An automobile coating, automotive finishing or industrial coating composition, comprising coated and/or uncoated Al 2 O 3 flakes having a particle thickness of less than 500 nm and a D 50 -value of 15-30 am and a D 90 -value of 30-45 am and one or more further ingredients suitable for an automobile coating, automotive finishing or industrial coating.
35 . An automobile coating, automotive finishing or industrial coating composition according to claim 34 , wherein the coated and/or uncoated Al 2 O 3 flakes are present in an amount of 0.5 to 10% by weight based on the weight of the automobile coating, automotive finishing or industrial coating.