Pigment powders

A technology of pigments, powders, used in the field of preparation of such pigment powders, cosmetics and other decorative formulations

Pending Publication Date: 2018-10-09
MERCK PATENT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is still a need for high gloss (HL) BiOCl pigments in powder form

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0119] A slurry of 100 g of high-gloss BiOCl flakes (thickness ~60 nm; particle size 8-20 μm, which washes away reaction by-products (salts and surfactants)) was adjusted to 3 wt% concentration in deionized water. The temperature was raised to 75°C with constant agitation vigorous enough to maintain a uniform suspension and dispersion of the feed solution throughout the reaction vessel. A solution of 85 g of ferric ammonium sulfate dodecahydrate in 300 mL of deionized water was fed into the slurry via a submerged inlet tube such that the pH dropped from neutral pH to 3.0 over 30-45 minutes during the initial feed rate . The remaining solution was delivered over 3 hours while the pH was kept close to 3.0 by concurrent co-feeding of 5% ammonia solution. The color of the paste changed from pearlescent silver to gold. Thereafter it will contain 5.5% SiO 2 The dilute sodium water glass solution was delivered slowly over approximately 4 hr until a pH of 6.0 was reached. The slur...

Embodiment 2

[0121] The procedure of Example 1 was repeated, but using 112 g of ferric ammonium sulfate dodecahydrate instead of 85 g of ferric ammonium sulfate dodecahydrate and omitting the final neutralization and SiO 2 , which resulted in a composite pigment in powder form comprising 100 g of BiOCl and 20 g of iron oxide as FeOOH.

Embodiment 3

[0123] The procedure of Example 2 was repeated, using 140 g of ferric ammonium sulfate dodecahydrate instead of 85 g of ferric ammonium sulfate dodecahydrate, which resulted in a composite pigment in powder form comprising 100 g of BiOCl, 25 g of iron oxide as FeOOH .

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Abstract

The present invention relates to pigment powders consisting of coated BiOCl flakes selected from a) BiOCl flakes having a coating comprising yellow iron oxide Fe2O3*xH2O, optionally a colorant, optionally an adjuvant, and optionally SiO2, b) BiOCl flakes having a coating comprising SiO2, optionally a colorant, and optionally an adjuvant, c) BiOCI flakes having a coating comprising a colorant, SiO2, optionally yellow iron oxide Fe2O3 *xH2O, and optionally an adjuvant, and d) BiOCI flakes having a coating comprising Fe3O4 and optionally SiO2, to a process for the preparation of the pigment powders, and to the use thereof especially in cosmetic formulations.

Description

technical field [0001] The present invention relates to pigment powders consisting of coated BiOCl flakes, to a process for the preparation of such pigment powders, and to their use, in particular in cosmetic and other decorative formulations. Background technique [0002] Bismuth oxychloride (BiOCl) pigments are well known in the art and are disclosed in eg US6743285, US7318862, DE1003377, DE4305280, JP2001-279126, US6579357, EP2584010 and JP2012-180403. [0003] Because of their high refractive index and pearly or metallic silver luster, BiOCl pigments are used in paint coatings, plastics and cosmetic products. However, there is still a need for high luster (HL) BiOCl pigments in powder form. [0004] Surprisingly, the present invention provides coated BiOCl flakes which are in powder form and exhibit high gloss. Advantageously, the new pigment powder is a dry, liquid-free powder that is immediately redispersible. Contents of the invention [0005] In detail, the pres...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61K8/20A61K8/19A61K8/25A61K8/02A61Q19/00
CPCA61K8/022A61K8/19A61K8/20A61K8/25A61Q19/00A61K2800/10A61Q1/02C09C1/0015A61K2800/436A61K2800/622A61K2800/651C09C2220/10C09D7/62C09C1/0051C09C1/0063C09C2200/301A61K2800/621C09C1/0024C09C1/0036A61K8/0254A61Q1/10A61Q1/06A61Q5/02A61Q3/02C09C2200/1087C09C2220/103C09C1/0021C09C1/0045C09C3/063C09D11/037A61K2800/43C09C3/00
Inventor P·卡维拉特纳M·特勒夫森成庆民M·艾登斯彭庆芸
Owner MERCK PATENT GMBH
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