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Perlglanz pigmente

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

Active Publication Date: 2012-10-03
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

[0053] Example 1: Glass flake + SiO 2 + TiO 2 (rutile) + SiO 2

[0054] 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 of sodium water glass solution containing 26.8% SiO dissolved in 112 g of 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 simultane...

Embodiment 2A

[0059] Example 2A: Glass Flake + TiO 2 (Anatase) + SiO2

[0060] 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.

[0061] 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 tan b * / a * ) to control the precipitation process. After reaching the desired silver endpoint, the mixture was stirred for an additional 15 minutes.

[0062] 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 ...

Embodiment 2B

[0065] Example 2B: Glass Flake + TiO 2 (rutile) + SiO 2

[0066] 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, 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 dropwise addition of 32% sodium hydroxide solution. When the addition was complete, the mixture was stirred for an additional 15 minutes.

[0067] 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 dete...

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Abstract

The present invention relates to pearlescent pigments based on glass flakes which are distinguished by the fact that they have the following layer structure: A) optionally a layer of SiO2, B) a high-refractive-index coating have a refractive-index n>1.8 which essentially consists of TiO2, C) a low-refractive-index layer comprising SiO2 and / or Al2O3 and optionally D) an outer protective layer, and to the use thereof in paints, coatings, automobile paints, powder coatings, printing inks, security printing inks, plastics, ceramic materials, glasses, paper, in toners for electrophotographic printing processes, in seed, in greenhouse sheeting and tarpaulins, as absorbers in the laser marking of paper and plastics, as absorbers for the laser welding of plastics, in cosmetic formulations, for the preparation of pigment pastes with water, organic and / or aqueous solvents, for the preparation of pigment compositions and dry preparations.

Description

[0001] This divisional application is a divisional application based on the Chinese patent application with the application number 200580027518.3, the application date is August 10, 2005, and the invention name is "Pearlescent Pigment". technical field [0002] 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 [0003] 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. [0004] Plastics are used both indoors and outdoors and often contain a range of additives to improve performance, such as plasticizers, fillers, stab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/00C09C3/06A61K8/29A61K8/35A61K8/92A61Q19/04C09D5/36C09D11/02C08K9/02
CPCC09C2200/303C09C1/0051A61Q1/02C01P2004/54C01P2004/20C09C2200/302A61K2800/436C09C2220/10C09C2200/301C01P2004/80C09C1/0024A61K8/25C09C2220/106C09C2220/103C09C2200/102Y10T428/2991Y10T428/2993
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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