Nacreous pigments

A technology of pearlescent pigments and glass flakes, applied in the field of pearlescent pigments, can solve the problems of pigment fragmentation, optical effects, large stress, and changes

Inactive Publication Date: 2007-07-25
MERCK PATENT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The stress can become so great that the pigment cracks and its optical effect changes accordingly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Example 1: Glass flake + SiO 2 +TiO 2 (rutile)+SiO 2

[0053] 150 g of glass flakes with a particle size fraction (Fraktion) of 20-200 μm and an average layer thickness of 900 nm were heated to 75° C. with stirring in 1.9 liters of deionized (VE) water. The pH of the suspension was then adjusted to 7.5 with 5% hydrochloric acid. Sodium water glass solution (112 g sodium water glass solution containing 26.8% SiO dissolved in 112 g deionized water) was then added dropwise 2 ), during which the pH was kept constant at 7.5 by simultaneous metered addition of 5% hydrochloric acid. When the addition was complete, the mixture was stirred for an additional 0.5 h. The pH of the suspension was then adjusted to 1.8, and the mixture was stirred for 15 minutes, and a hydrochloric acid solution of tin tetrachloride (3 g SnCl 4 *5H 2 O, dissolved in 15 ml of 25% hydrochloric acid and 85 ml of completely desalted water), during which the pH was kept constant by simultaneous drop...

Embodiment 2A

[0058] Example 2A: Glass flakes + TiO 2 (Anatase)+SiO 2

[0059] 150 g of glass flakes with a particle size fraction of 20-200 μm and an average layer thickness of 900 nm were heated to 75° C. in 1.9 liters of deionized water with stirring. The pH of the suspension was then adjusted to 2.0 with concentrated hydrochloric acid.

[0060] A 30% titanium tetrachloride solution was then metered in, during which the pH was kept constant by simultaneous dropwise addition of a 32% sodium hydroxide solution. The color properties are controlled during the preparation of the pigment by color measurement during the process and are determined according to the hue (hue angle arc tanb * / a * ) controls the precipitation process. After reaching the desired silver endpoint, the mixture was stirred for an additional 15 minutes.

[0061] Adjust the pH to pH 9.0 with dilute sodium hydroxide solution. 100 ml of a sodium water glass solution with a 5% silicic acid content were added within 2 ho...

Embodiment 2B

[0063] The pigments obtained in this way comprise a silica coating with a layer thickness of about 18-28 nm. Example 2B: Glass flakes + TiO 2 (rutile)+SiO 2

[0064] 150 g of glass flakes with a particle size fraction of 20-200 μm and an average layer thickness of 900 nm were heated to 75° C. with stirring in 1.9 liters of deionized water. Then the pH value of the suspension was adjusted to 2.0, the mixture was stirred for 15 minutes, and a hydrochloric acid solution of tin tetrachloride (3gSnCl 4 *5H 2 O, dissolved in 15 ml of 25% hydrochloric acid and 85 ml of completely desalted water), during which the pH was kept constant by simultaneously adding 32% sodium hydroxide solution dropwise. When the addition was complete, the mixture was stirred for an additional 15 minutes.

[0065] A 30% titanium tetrachloride solution was then metered in, during which the pH was kept constant by simultaneous dropwise addition of a 32% sodium hydroxide solution. The color properties ar...

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Abstract

The invention relates to glass platelet-based nacreous pigments which are characterized by the following layer structure: A) optionally an SiO2 layer, B) a highly refractive coating having a refractive index n > 1.8 and substantially consisting of TiO2, C) a low refractive-index layer containing SiO2 and/or AI2O3 and optionally D) an outer protective layer. The invention also relates to the use of these pigments in paints, lacquers, car paints, coating powders, printing inks, security printing inks, plastic materials, ceramic materials, glasses, papers, in toners for electrophotographic printing processes, in seeds, in greenhouse films and tarpaulins, as absorbing agents used in laser marking of paper and plastic materials, as absorbing agents used in laser welding of plastic materials, in cosmetic formulations, for producing pigment pasting compounds with water, organic and/or aqueous solvents, for producing pigment preparations and dry preparations.

Description

technical field [0001] The present invention relates to pearlescent pigments based on multi-coated glass flakes and to their use, in particular in paints, coatings, printing inks, plastics and in cosmetic formulations. The pigments according to the invention are particularly suitable for coloring plastics because of their increased chemical and mechanical stability. Background technique [0002] Silver-white pigments are used as gloss or effect pigments in many fields of industry, especially in decorative coatings, in plastics, in paints, coatings, printing inks and in cosmetic formulations. [0003] Plastics are used both indoors and outdoors and often contain a range of additives to improve performance, such as plasticizers, fillers, stabilizers and anti-aging agents, lubricants and mold release agents, antistatic agents and colorants. Pigments, especially silver-white or effect pigments, are added to plastics for decorative purposes. Undesirable interactions are often o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/00
CPCA61K2800/436C01P2004/80C09C2200/302C09C1/0024C09C1/0051Y10T428/2993C09C2200/303C09C2200/301A61Q1/02A61K8/25C09C2220/10C09C2200/102C09C2220/103C01P2004/54C09C2220/106Y10T428/2991C01P2004/20
Inventor S·梅尔森M·恩滕曼M·杰克尔M·马蒂亚斯
Owner MERCK PATENT GMBH
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