Interference pigments on the basis of perlite flakes

Patent metadata

Field	Value
Publication number	US-9963593-B2
Application number	US-201615173640-A
Country	US
Kind code	B2
Filing date	Jun 4, 2016
Priority date	Jul 12, 2007
Publication date	May 8, 2018
Grant date	May 8, 2018

Abstract

The present invention relates to pigments, comprising a plate-like substrate of perlite, and (a) a dielectric material, especially a metal oxide, having a high index of refraction; and/or (a) a metal layer, especially a thin semi-transparent metal layer; a process for their production and their use in paints, ink jet printing, for dyeing textiles, for pigmenting coatings (paints), printing inks, plastics, cosmetics, glazes for ceramics and glass.

First claim

The invention claimed is:

1. An interference pigment comprising at least three alternating layers of high and low refractive index, layered structure comprising:
a substrate comprising perlite flakes having a median particle size (d 50 ) of 15-50 μm, a floater content of less than 10 percent by volume, and a blue light brightness greater than 80;
a first coating on the substrate having a refractive index >1.65 and comprising;
a second coating disposed on the first coating and having a refractive index ≤1.65; and
a third coating disposed on the second coating and having a refractive index >1.65.

2. The pigment of claim 1 , wherein the thickness of the first coating is 20 to 350 nm.

3. The pigment of claim 1 , wherein the thickness of the second coating is 30 to 600 nm.

4. The pigment of claim 1 , wherein the thickness of the third coating is 20 to 350 nm.

5. The pigment of claim 1 , wherein the first coating comprises a metal oxide, metal sulfide, or metal oxide mixture.

6. The pigment of claim 1 , wherein the first coating comprises TiO 2 , Fe 2 O 3 , TiFe 2 O 5 , Fe 3 O 4 , BiOCl, CoO, Co 3 O 4 , Cr 2 O 3 , VO 2 , V 2 O 3 , Sn(Sb)O 2 , SnO 2 , ZrO 2 , iron titanates, iron oxide hydrates, titanium suboxides, bismuth vanadate, cobalt aluminate, or any mixture thereof.

7. The pigment of claim 1 , wherein the first coating comprises a sulfide of tin, silver, lanthanum, or rare earth metal.

8. The pigment of claim 1 , wherein the second coating comprises SiO 2 , MgF 2 , Al 2 O 3 , AlOOH, B 2 O 3 , or a mixture thereof.

9. The pigment of claim 1 , wherein the third coating comprises a colorless or colored metal oxide.

10. The pigment of claim 1 , wherein the third coating comprises TiO 2 , Fe 2 O 3 , TiFe 2 O 5 , Fe 3 O 4 , BiOCl, CoO, Co 3 O 4 , Cr 2 O 3 , VO 2 , V 2 O 3 , Sn(Sb)O 2 , SnO 2 , ZrO 2 , iron titanates, iron oxide hydrates, titanium suboxides, bismuth vanadate, cobalt aluminate, or any mixture thereof.

11. The pigment of claim 1 further comprising interlayers of absorbing or nonabsorbing materials between the first coating, the second coating, and the third coating.

12. The pigment of claim 11 , wherein the thickness of the interlayers is 1 to 30 nm.

13. A composition comprising the pigment of claim 1 , wherein the composition is a paint, printing ink, plastic, cosmetic, ceramic, or glass.

14. A method of using the pigment of claim 1 comprising incorporating the pigment in a coating; a printing ink; a plastic; a cosmetic; or a glaze for a ceramic or a glass.

15. A method for preparing the pigment of claim 1 comprising applying the first coating, the second coating, and the third coating by wet chemical coating.

16. The interference pigment of claim 1 which is:
Perlite/TiO 2 /SiO 2 /TiO 2 ;
Perlite/TiO 2 /SiO 2 /Fe 2 O 3 ;
Perlite/TiO 2 /SiO 2 /TiO 2 .Fe 2 O 3 ;
Perlite/TiO 2 /SiO 2 /(Sn,Sb)O 2 ;
Perlite/(Sn, Sb)O 2 /SiO 2 /TiO 2 ;
Perlite/Fe 2 O 3 /SiO 2 /(Sn, Sb)O 2 ;
Perlite/TiO 2 .Fe 2 O 3 /SiO 2 /TiO 2 .Fe 2 O 3 ;
Perlite/TiO 2 /SiO 2 /MoS 2 ;
Perlite/TiO 2 /SiO 2 /Cr 2 O 3 ;
Perlite/Cr 2 O 3 /SiO 2 /TiO 2 ;
Perlite/Fe 2 O 3 /SiO 2 /TiO 2 ;
Perlite/TiO 2 /Al 2 O 3 /TiO 2 ;
Perlite/Fe 2 TiO 5 /SiO 2 /TiO 2 ;
Perlite/TiO 2 /SiO 2 /Fe 2 TiO 5 /TiO 2 ;
Perlite/TiO suboxides/SiO 2 /TiO suboxides;
Perlite/TiO 2 /SiO 2 /TiO 2 /SiO 2 /TiO 2 +Prussian Blue;
Perlite/TiO 2 /SiO 2 /TiO 2 /SiO 2 /TiO 2 ; or
Perlite/TiO 2 /SiO 2 /TiO 2 /SiO 2 /TiO 2 /SiO 2 /TiO 2 .

Assignees

• Basf Corp

Inventors

• Bujard Patrice
• Bugnon Philippe
• Baysang Marc

Classifications

• A61Q1/02

  Preparations containing skin colorants, e.g. pigments (preparations in powder form A61Q1/12) · CPC title

• C09D5/36

  Pearl essence, e.g. coatings containing platelet-like pigments for pearl lustre · CPC title

• C09C1/0015 Primary

  Pigments exhibiting interference colours, e.g. transparent platelets of appropriate thinness or flaky substrates, e.g. mica, bearing appropriate thin transparent coatings · CPC title

• A61K2800/10

  General cosmetic use · CPC title

• C01P2004/54

  Particles characterised by their aspect ratio, i.e. the ratio of sizes in the longest to the shortest dimension · CPC title