Multilayer pigments based on glass flakes

A technology of glass flakes and pigments, applied in pigment preparation, inorganic pigment treatment, multi-color effect coatings, etc., can solve problems such as poor product quality

Inactive Publication Date: 2008-01-16
MERCK PATENT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As demonstrated in the examples below, the quality of products prepared according to the teachings of this patent is poor

Method used

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  • Multilayer pigments based on glass flakes
  • Multilayer pigments based on glass flakes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0109] 100 g of glass flakes (refractive index 1.5) having a maximum diameter of 40 μm (average 22 μm) and an average thickness of 0.5 μm were suspended in 2 1 of deionized water. Under strong stirring, the slurry was heated to 75 °C, and by adding SnCl within 0.5 h 4 an aqueous solution, equivalent to 3% SnO with respect to glass flakes 2 amount, and start coating. Once a pH of 2.0 was reached, 32% NaOH solution was simultaneously added to maintain the pH at this value.

[0110] Keep the slurry stirring for 15 min, then start adding TiCl 4 Aqueous solution (400gTiCl 4 / lH 2 O). The pH was kept constant at 2.0 with NaOH. Continue until the desired color is achieved. The slurry was kept stirring for an additional 15 min.

[0111] The pH was raised to 8.0 by slowly adding NaOH, and then started adding 1.35ml / min of 10% sodium silicate solution (from 74ml containing 8% Na and 27% SiO 2 A sodium silicate solution was prepared by diluting with 170 ml of deionized water). Th...

Embodiment 2

[0113] Embodiment 2 (comparative embodiment)

[0114] This embodiment is carried out in the same manner as Embodiment 1. Instead of glass flakes, mica with the same particle size distribution is used.

[0115] The effect of the drawdown of the final pigment is shiny and color positive, but it does not have the distinctive clarity, especially the transparency shown in shallow angles by glass flake based multilayer pigments.

Embodiment 3

[0117] 100 g of glass flakes (refractive index 1.5) having a maximum diameter of 40 μm (average 22 μm) and an average thickness of 0.8 μm were suspended in 2 1 of deionized water. The suspension was heated to 75°C, adjusted to pH 1.8 with dilute hydrochloric acid, first by adding 3.3ml / min of SnCl 4 Solution (from 2.2g SnCl 4 and 7.5ml concentrated hydrochloric acid in 100ml deionized water), while SnO 2 coated. The pH was kept constant using 32% sodium hydroxide solution.

[0118] Stir continuously for 15min, then under the same pH / temperature conditions, add 1.5ml / min of TiCl 4 Solution (400g TiCl 4 / l) and use 32% sodium hydroxide solution to keep the pH constant 2 coated. Coating was discontinued after the secondary green endpoint was reached, stirring was continued for 15 minutes, the pH was adjusted to 8.0 with dilute sodium hydroxide solution (over the course of about 15 minutes), and stirring was continued for an additional 10 minutes.

[0119] Then, by adding 3...

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Abstract

The present invention relates to multilayer pigments based on glass flakes and to a method for the production of such pigments. The resulting pigment can be used in any application for which pearlescent pigments have been heretofore used such as, for example, in plastics, paints, inks, cosmetic formulations, coatings including solvent or waterborne automotive paint systems, powder coatings, inks and agriculture foils, for the laser-marking of papers and plastics.

Description

[0001] This divisional application is a divisional application based on the Chinese patent application with the application number 02813847.3, the application date is July 1, 2002, and the invention title is "glass flake-based multilayer pigment". technical field [0002] The present invention relates to glass flake based multilayer pigments and to a process for the production of such pigments and their use in plastics, paints, coatings, powder coatings, inks, printing inks, glass, ceramic products, agricultural films, for paper and laser marking of plastics and use in cosmetic formulations. Background technique [0003] Pearlescent pigments or special effect pigments are used in many areas of industry, especially in automotive finishes, in decorative paints, in plastics, in paints, in printing inks and in cosmetic formulations. [0004] Multilayer optical interference pigments with alternating layers of high and low refractive index are known. They differ with regard to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C3/06C09C1/00C08K3/00C09D7/12C03C6/00A61K8/19D21H21/44C08J7/00C09D5/29C09D201/00
CPCC09C2200/303C09C2200/301C03C3/06C09C1/0024C09C1/0042C09C2220/106C09C1/0039C09C2200/302C09C2200/102C01P2004/61Y10T428/252Y10T428/256Y10T428/257Y10T428/2991Y10T428/2993Y10T428/2996
Inventor K·安布罗修斯R·安塞尔曼S·舍恩
Owner MERCK PATENT GMBH
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