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Multiple layered pigments exhibiting color travel

A technology of pigments and interference pigments, applied in the direction of pigment preparation, fibrous fillers, chemical instruments and methods, etc.

Inactive Publication Date: 2009-10-21
BASF CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Improved mechanical stability overcomes cracking and peeling of the coating due to shrinkage during calcination

Method used

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  • Multiple layered pigments exhibiting color travel
  • Multiple layered pigments exhibiting color travel
  • Multiple layered pigments exhibiting color travel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Invention Example 1 and Comparison 1

[0052] 200 grams of natural mica (average particle size 45-50 microns) was slurried with 1.0 liter of deionized water and stirred at 250-300 rpm. At room temperature, add 2.0-4.0 g of 39% FeCl 3 to pH 3.2. The slurry was heated to 75°C (nucleation step). At this temperature, 200.0 g of 39% FeCl was added at 1.0 mL / min at pH 3.2 3 (38.0 g Fe 2 o 3 ). The pH was adjusted to 8.25 with 35% NaOH. Add 3000.0 g sodium metasilicate x 9H at 5.0 ml / min at pH 8.25 2 O (176.0 g SiO 2 ). The pH was maintained with 17% HCl. Add 180.0 g TiCl at 1.5 mL / min at a constant pH 1.9 (maintained with 35% NaOH) 4 (30.0 g TiO 2 ). The paste has optically variable properties (OVP), changing from red to gold to green in the reaction flask. The slurry was divided into two equal parts; one part: Control 1, samples calcined at 500, 750 and 850 °C, the other part: Inventive Example 1, post-treated with Mg as follows:

[0053] The slurry was adju...

Embodiment 2

[0054] Invention Example 2 and Control 1a

[0055] Inventive Example 1 was repeated, but with 1.0-1.5% Ca added. Similar results were observed. Control 1a was prepared by the method described for Control 1. The samples were calcined at various temperatures (see Table 1).

[0056] Invention Example 3 and Control 1b

[0057] Inventive Example 1 was repeated, but with the addition of 1.0-2.0% Zn. Similar results were observed. Control 1b was prepared by the method described for Control 1 . The samples were calcined at various temperatures (see Table 1).

Embodiment 4

[0059] As a means of further comparison, Table 1 is presented showing the effect of Ca, Mg, Zn on the optical stack in terms of surface area densification (BET) as a function of Ca / Mg / Zn content and calcination temperature compared to the control sample. In Table 1, the unit of BET is square meters per gram.

[0060] Table 1

[0061]

[0062] Although the addition of Ca, Mg or Zn results in extreme densification at 850°C, these additives advantageously produce the ability to densify metal oxide surfaces at temperatures much lower than normal calcination temperatures. For example, the Ca control sample achieved a BET of 7.5 m2 / g at 650 °C, while its Ca-treated counterpart reached a value of 3.2 m2 / g at the same temperature. Even at 350 °C, the Ca-coated product was much denser than its control counterpart. As shown, the Mg and Zn treated samples behaved similarly. Therefore, this technique is unique and cost-effective without compromising the OVP characteristics of the pr...

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Abstract

The present invention relates to interference pigments on the basis of multiply coated, platelet-shaped substrates which comprise at least one layer sequence comprising: (A) a metal oxide coating having a refractive index n = 2.0, (B) a colorless metal oxide or fluoride coating having a refractive index n = 1.8, (C) a nonabsorbing metal oxide coating of high refractive index, and, wherein the pigment further comprises (D) an oxide of calcium, magnesium, or zinc. The present pigment may be used in paints, printing inks, and for producing counterfeit-protected documents of value, such as bank notes, cheques, cheque cards, credit cards, identity cards, etc.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit under 35 U.S.C. §119(e) of U.S. Provisional Patent Application 60 / 829,891, filed October 18, 2006, which is hereby incorporated by reference in its entirety. technical field [0003] The present application relates to improved multilayer pigments. Background of the invention [0004] There are many pearlescent pigments based on micaceous or other layered substrates which have been coated with metal oxide layers. These pigments exhibit a pearly sheen due to light reflection and refraction. Depending on the thickness of the metal oxide layer, they can also exhibit interference color effects. A full description of this class of pigments can be found in U.S. Patent Nos. 3,087,828 and 3,087,829, and L.M. Greenstein, "Nacreous (Pearlescent) Pigments and Interference Pigments", Pigment Handbook, Volume 1, Properties and Economics, 2nd Edition, edited by Peter J. Lewis (1988 ), John Wile...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/00
CPCC01P2006/12C09C2200/1016C09C2200/1033C01P2002/72C09C2200/401C09C1/0024C09C1/0039C09C2220/106C09C2200/1004C09C2200/102C01P2004/61C09C1/00
Inventor C·小德吕卡
Owner BASF CORP
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