阅读说明：本技术 深蓝黑色效果颜料 (Dark blue black effect pigments ) 是由 佐佐木富美子 K·弗里切 百濑雅之 M·琼戈尼兹 于 2020-03-12 设计创作，主要内容包括：本发明涉及表现出深黑色的主体颜色以及蓝色的干涉颜色的效果颜料、用于制备这种颜料的方法以及其用途,尤其是在涂料组合物中的用途。(The present invention relates to effect pigments which exhibit a deep black host colour and an interference colour of blue, to a process for preparing such pigments and to their use, in particular in coating compositions.)

1. Dark blue black effect pigments, wherein each pigment comprises

A synthetically prepared transparent dielectric flake-like substrate which itself has a green interference color and a refractive index n of greater than 1.5, and

-at least one layered structure on said sheet-like substrate consisting of:

a first layer consisting of hematite and/or goethite, and

a second layer consisting of magnetite,

wherein the second layer is located on top of the first layer and the first layer is located directly on the substrate.

2. The effect pigment of claim 1, wherein the transparent dielectric platelet-shaped substrate is composed of Al₂O₃Is composed of Al₂O₃With TiO in an amount of up to 5 wt% based on the weight of the substrate₂Composition of, consisting of ZrO₂Consisting of or consisting of TiO₂Composition, or comprising Al in a proportion of at least 90 wt. -%, based on the weight of the substrate₂O₃、ZrO₂Or TiO₂Or SiO in an amount of up to 70 wt.%₂Glass flakes in proportions.

3. The effect pigment of claim 1 or 2, wherein the transparent dielectric substrate is made of Al₂O₃Is composed of, or consists of Al₂O₃With TiO in an amount of up to 5 wt% based on the weight of the substrate₂And has a geometric thickness in the range of 50 to 110nm, in the range of 180 to 260nm, or in the range of 350 to 450 nm.

4. The effect pigment according to one or more of claims 1 to 3, having a particle size in the range of from 5 to 200 μm.

5. The effect pigment according to one or more of claims 1 to 4, wherein the first layer has a geometric thickness in the range of 0.1 to 10 nm.

6. The effect pigment according to one or more of claims 1 to 5, wherein the second layer has a geometric thickness in the range of 80 to 230 nm.

7. The effect pigment according to one or more of claims 1 to 6, wherein the second layer comprises an aluminium compound.

8. The effect pigment according to one or more of claims 1 to 7, further comprising a colourless dielectric layer on top of the second layer.

9. The effect pigment of claim 8, wherein said colorless dielectric layer is a layer of silicon dioxide and/or silicon oxide hydrate.

10. The effect pigment according to one or more of claims 1 to 9, comprising an outermost inorganic and/or organic aftercoat layer.

11. Process for preparing a deep blue black effect pigment according to one or more of claims 1 to 10, comprising the steps of:

(a) a synthetically prepared transparent dielectric flake-like substrate having a green interference color and a refractive index n of greater than 1.5 is dispersed in water,

(b) adding a water-soluble iron (III) compound at a pH of 2 to 4 and keeping the pH constant, thereby precipitating a layer consisting of hematite and/or goethite onto the surface of the substrate particles,

(c) increasing the pH to a value of 5.5 to 7.5 and adding a water-soluble iron (II) compound and a water-soluble iron (III) compound, and optionally also an aqueous solution of an aluminium compound, while keeping the pH constant, to directly precipitate a magnetite layer, optionally comprising an aluminium compound, onto the surface of the substrate particles pre-coated in step (b),

(d) optionally washing and filtering the resulting product, and

(e) drying at a temperature in the range of > 100 ℃ to 260 ℃.

12. The method of claim 11, wherein the transparent dielectric laminar substrate is composed of Al₂O₃Is composed of Al₂O₃With TiO in an amount of up to 5 wt% based on the weight of the substrate₂Composition of, consisting of ZrO₂Consisting of or consisting of TiO₂Composition or comprises Al in a proportion of at least 90 wt. -%, based on the weight of the substrate₂O₃、ZrO₂Or TiO₂Or SiO in an amount of up to 70 wt.%₂Glass flakes in proportions.

13. The method of claim 11 or 12, wherein the transparent dielectric substrate is made of Al₂O₃Is composed of or consists of Al₂O₃With TiO in an amount of up to 5 wt% based on the weight of the substrate₂And has a geometric thickness in the range of 50 to 110nm, in the range of 180 to 250nm, or in the range of 350 to 450 nm.

14. The process according to at least one of claims 11 to 13, which is carried out in an inert gas atmosphere.

15. The method according to at least one of the claims 11 to 14, wherein after step (c) and before step (e) is carried out, in a further step a colourless dielectric layer is applied onto the magnetite layer.

16. The method according to at least one of the claims 11 to 15, wherein the colourless dielectric layer applied to the magnetite layer is a layer of silicon dioxide and/or silicon oxide hydrate.

17. The method according to at least one of the claims 11 to 16, wherein the layer consisting of magnetite is applied onto the substrate particles in a thicker thickness than the layer consisting of hematite and/or goethite.

18. Use of the effect pigments according to at least one of claims 1 to 10 for pigmented inks, quick-drying paints, varnishes, coating compositions, plastics, foils, papers, ceramics, glass, for laser marking and for pigmented pigment preparations of different solvent content.

19. Use according to claim 18, wherein the quick-drying paint, paint or coating composition is an automotive quick-drying paint, automotive paint or automotive coating composition.