EFFECT PIGMENTS

• US 20120301554A1
• Filed: 12/17/2010
• Published: 11/29/2012
• Est. Priority Date: 01/15/2010
• Status: Abandoned Application

• Current Assignee: Merck Patent GmbH (Merck & Co., Inc.)
• Original Assignee: Merck Patent GmbH (Merck & Co., Inc.)
• Inventors: Kniess, Helge Bettina
• Application Number:
  US13/521,890
• Publication Number:
  US 20120301554A1
• Time in Patent Office: Days
• US Class Current: 424/635
• CPC Class Codes: C01P 2002/32 spinel-type (AB2O4)
• CPC Class Codes: C01P 2004/20 extending in two dimensions, e.g. plate-like
• CPC Class Codes: C01P 2004/61 Micrometer sized, i.e. from 1-100 micrometer
• CPC Class Codes: C01P 2006/60 Optical properties, e.g. expressed in CIELAB-values
• CPC Class Codes: C01P 2006/62 L* (lightness axis)
• CPC Class Codes: C01P 2006/65 Chroma (C*)
• CPC Class Codes: C08K 3/22 of metals
• CPC Class Codes: C08K 9/02 Ingredients treated with inorganic substances
• CPC Class Codes: C09C 1/0015 Pigments exhibiting interference colours, e.g. transparent platelets of appropriate thinness or flaky substrates, e.g. mica, bearing appropriate thin transparent coatings
• CPC Class Codes: C09C 1/0021 comprising a core coated with only one layer having a high or low refractive index
• CPC Class Codes: C09C 1/0024 comprising a stack of coating layers with alternating high and low refractive indices, wherein the first coating layer on the core surface has the high refractive index
• CPC Class Codes: C09C 2200/102 the core consisting of glass or silicate material like mica or clays, e.g. kaolin
• CPC Class Codes: C09C 2200/1037 the core consisting of an inorganic suboxide or a mixture thereof, e.g. SiOx or TiOx
• CPC Class Codes: C09C 2200/1062 the core consisting of an organic compound, e.g. Liquid Crystal Polymers [LCP], Polymers or natural pearl essence
• CPC Class Codes: C09C 2200/1087 the core consisting of bismuth oxychloride, magnesium fluoride, nitrides, carbides, borides, lead carbonate, barium or calcium sulfate, zinc sulphide, molybdenum disulphide or graphite
• CPC Class Codes: C09C 2200/301 Thickness of the core
• CPC Class Codes: C09C 2200/302 Thickness of a layer with high refractive material
• CPC Class Codes: C09C 2200/303 Thickness of a layer with low refractive material
• CPC Class Codes: C09C 2220/10 Wet methods, e.g. co-precipitation
• CPC Class Codes: C09C 2220/106 comprising only a drying or calcination step of the finally coated pigment
• CPC Class Codes: C09C 2220/20 : PVD, CVD methods or coating in a gas-phase using a fluidized bed
• CPC Class Codes: C09D 11/037 : characterised by the pigment
• CPC Class Codes: C09D 17/004 : containing an inorganic pigment
• CPC Class Codes: C09D 5/032 : characterised by a special effect of the produced film, e.g. wrinkle, pearlescence, matt finish
• CPC Class Codes: C09D 5/36 : Pearl essence, e.g. coatings containing platelet-like pigments for pearl lustre
• CPC Class Codes: C09D 7/62 : modified by treatment with other compounds
• CPC Class Codes: C09D 7/70 : characterised by shape, e.g. fibres, flakes or microspheres

Abstract

The present invention relates to effect pigments having a substrate which has a coating comprising a complex metal oxide containing copper, iron and manganese, and to a process for the preparation of the effect pigments, to the use of the effect pigments in paints, coatings, powder coatings, printing inks, plastics, ceramic materials, glasses, in cosmetic formulations, for laser marking and for the preparation of pigment preparations and dry preparations.

Claims

1. Effect pigment having a substrate which has a coating comprising a complex metal oxide containing copper, iron and manganese.

2. Effect pigment according to claim 1, characterised in that the complex metal oxide has a spinel structure.

3. Effect pigment according to one of claim 1, characterised in that the amount of complex metal oxide is 2.5-60% by weight, in particular 20-50% by weight, based on the substrate.

4. Effect pigment according to claim 1, characterised in that the complex metal oxide conforms to the formula Cu_xFe_yMn_3-x-yO₄, where x=1-1.4 and y=0.1-1.

5. Effect pigment according to claim 1, characterised in that the complex metal oxide additionally contains aluminium cations, cobalt cations and/or titanium cations.

6. Effect pigment according to claim 1, characterised in that the complex metal oxide is a copper spinel of the form Cu(Fe,Mn)₂O₄.

7. Effect pigment according to claim 1, characterised in that the coating partially comprises titanium dioxide.

8. Effect pigment according to claim 1, characterised in that the coating has a thickness of 1 to 350 nm, preferably 100 to 250 nm.

9. Effect pigment according to claim 1, characterised in that the substrate is in flake form.

10. Effect pigment according to claim 1, characterised in that the substrate is natural or synthetic mica, BiOCl flakes, glass flakes, Fe₂O₃ flakes, graphite flakes, Al₂O₃ flakes, SiO₂ flakes or TiO₂ flakes or mixtures of these flakes, in particular natural or synthetic mica.

11. Effect pigment according to claim 1, characterised in that the substrate has one or more layers comprising high-and/or low-refractive-index, transparent or semitransparent metal compounds beneath or above the coating comprising a complex metal oxide.

12. Effect pigment according to claim 11, characterised in that the metal compounds are selected from TiO₂, ZrO₂, ZnO, SnO₂, SiO₂, SiO(OH)₂, Al₂O₃, AlO(OH), B₂O₃ and mixtures thereof.

13. Effect pigment according to claim 1, characterised in that it has an inorganic or organic post-coating.

14. Process for the preparation of the effect pigments according to claim 1, characterised in that the coating of the flake-form substrates is carried out by wet-chemical methods, by CVD methods or PVD methods.

15. A composition comprising an effect pigment according to claim 1 and at least one further component used for paints, coatings, powder coatings, printing inks, plastics, ceramic materials, glasses, in cosmetic formulations, for laser marking and for the preparation of pigment preparations and dry preparations.