Pigments

A pigment and coating technology, which is used in the wet preparation of dyed pigments, thin material processing, fibrous fillers, etc., can solve the problems of gloss loss and lack of

Inactive Publication Date: 2008-06-25
MERCK PATENT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above-mentioned pigments have the disadvantage that they exhibit a black mass or a high gloss, but do not have the highly desirable combination of these properties
In the case of known technical solutions, another disadvantage is that, in order to produce the desired dark shades and in order to produce hiding power, carbon black must be added as black pigment
Absorptive and light-scattering carbon blacks cause gloss loss

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] 100 g of mica with a particle size of 10-60 μm were heated to 75° C. in 1.9 liters of demineralized water with stirring. The pH of the suspension was adjusted to 3.0 using 10% hydrochloric acid. Then meter in 200 g of 30% FeCl 3 solution, during which the pH was kept constant by simultaneous dropwise addition of 32% sodium hydroxide solution. The product was filtered off, washed, dried and reduced at 750 ° C in a gas mixture containing nitrogen and hydrogen (the ratio of hydrogen: 8 vol%) to obtain a glossy pigment with silver interference, gray-black main color and high gloss. The layer consisted of 74 wt% metallic iron.

Embodiment 2

[0064]100 g of mica with a particle size of 10-60 μm were heated to 75° C. in 1.9 liters of demineralized water with stirring. The pH of the suspension was adjusted to 3.0 using 10% hydrochloric acid. Then meter in 300 g of 30% FeCl 3 solution, during which the pH was kept constant by simultaneous dropwise addition of 32% sodium hydroxide solution. The product was filtered off, washed, dried and reduced at 600 ° C in a gas mixture containing nitrogen and hydrogen (the ratio of hydrogen: 8 vol%) to obtain a glossy pigment with golden interference, gray-black main color and high gloss. The layer consisted of 26 wt% metallic iron.

Embodiment 3

[0066] The dry pigment obtained from Example 2 was reduced at 800° C. in a gas mixture containing nitrogen and hydrogen (ratio of hydrogen: 8 vol%) to obtain a glossy pigment with golden interference, gray-black main color and high gloss, which The coating consisted of 80 wt% metallic iron.

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Abstract

The invention relates to pigments comprising a substrate and a ferrous coating which is applied to the substrate and comprises metallic iron. The invention also relates to a method for producing the inventive pigments and to the use of the same.

Description

technical field [0001] The present invention relates to pigments comprising a substrate and applied to the substrate an iron-containing coating comprising metallic iron, a process for the preparation of the pigments according to the invention and their use. Background technique [0002] The use of effect pigments in a wide variety of applications is gaining in importance. In the automotive sector, in the coloring of plastics, in cosmetics and in the printing sector, effect pigments are increasingly being used, which are intended to impart a particular luster or a particular color effect to products colored with them. In general, effect pigments are substrates, e.g. containing metals, mica, or SiO 2 , glass or Al 2 o 3 The substrate is coated with one or more layers, such as a layer comprising a metal or a metal oxide. In particular, metal oxides are frequently used as layer materials, since they can be applied to the substrate by precipitation and are essentially chemica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/00A61K8/19B42D15/10B42D15/00A23L5/40
CPCC09C1/0078A61K2800/436C09C1/0021C09C2200/1004C09C2200/1087A61Q1/02C09C2220/10C09C2200/102A61Q3/02C09C2210/60Y10T428/2982C09C1/0015C09C2200/20A61K8/19Y10T428/2991B42D25/30B42D25/373C09C1/00C01P2004/86
Inventor H·B·克尼斯G·普法夫
Owner MERCK PATENT GMBH
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