Pigments

Patent metadata

Field	Value
Publication number	US-9890287-B2
Application number	US-201415111840-A
Country	US
Kind code	B2
Filing date	Dec 17, 2014
Priority date	Jan 16, 2014
Publication date	Feb 13, 2018
Grant date	Feb 13, 2018

Abstract

The present invention relates to pigments based on bismuth compounds and to the use thereof, preferably as laser-absorbent additive, and to a process for the preparation thereof.

First claim

The invention claimed is:

1. Pigment of the formula I,
m Bi 2 O 3 *n BiOX* o Bi a Ti b O c *p Ti x O y   I

where
X denotes halogen,
a denotes 1-15,
b denotes 1-5,
c denotes 1-15,
m denotes 0-5,
n denotes 1-5,
o denotes 1-5,
p denotes 0-5,
x denotes 1-8,
y denotes 1-10.

2. Pigment according to claim 1 , characterised in that X denotes chlorine.

3. Pigment according to claim 1 , characterised in that n=1.

4. Pigment according to claim 1 , characterised in that a=1-3.

5. Pigment according to claim 1 , characterised in that b=2-5.

6. Pigment according to claim 1 , characterised in that c=5-20.

7. Pigment according to claim 1 , characterised in that it comprises one or more compounds from the group of the compounds
Bi 2 Ti 4 O 11
Bi 2 Ti 2 O 7
Bi 1.74 Ti 2 O 6.62 .

8. Pigment according to claim 1 , characterised in that the pigment comprises the following mixed phases:
BiOCl, Bi 2 Ti 4 O 11 , TiO 2 or
BiOCl, Bi 2 Ti 2 O 7 or
BiOCl, Bi 1.74 Ti 2 O 6.62 or
BiOCl, Bi 2 Ti 4 O 11 .

9. Pigment according to claim 1 , characterised in that the pigment has particle sizes of 0.01-100.5 μm.

10. Process for the preparation of the pigment according to claim 1 , characterised in that a bismuth compound selected from the group Bi 2 O 3 , BiOCl, BiONO 3 , Bi(NO 3 ) 3 , Bi 2 O 2 CO 3 , BiOOH, BiOF, BiOBr, BiOC 3 H 5 O 7 , Bi(C 7 H 5 O 2 ) 3 , BiPO 4 , Bi 2 (SO 4 ) 3 , Bi a M b O c where M=Zn, Ti, Fe, Cu, Al, Zr, P, Sn, Sr, Si, Y, Nb, La, Ta, Pr, Ca, Mg, Mo, W, Sb, Cr, Ba, Ce and a=0.3-70, b=0.05-8 and c=1-100 is coated with TiO 2 and subsequently calcined at temperatures of 300-815° C.

11. Process according to claim 10 , characterised in that the bismuth compound is Bi 2 O 3 .

12. A composition comprising a pigment according to claim 1 as additive for laser marking, for laser welding, in paints, coatings, powder coatings, printing inks, plastics, or granules.

13. Polymer matrix comprising at least one pigment according to claim 1 and a polymer.

Assignees

• Merck Patent Gmbh

Inventors

• Kniess Helge Bettina
• Van Duijnhoven Franciscus Gerardus Henricus
• Gelissen Franciscus Wilhelmus Maria

Classifications

• C01P2004/61

  Micrometer sized, i.e. from 1-100 micrometer · CPC title

• C09C1/00

  Treatment of specific inorganic materials other than fibrous fillers (tenebrescent materials C09K9/00; luminescent materials C09K11/00); Preparation of carbon black · CPC title

• B41M5/267 Primary

  Marking of plastic artifacts, e.g. with laser · CPC title

• B41M2205/04

  Direct thermal recording [DTR] · CPC title

• C01G29/006

  Compounds containing bismuth, with or without oxygen or hydrogen, and containing two or more other elements · CPC title