Sulfur-modified zinc oxide

• US 7,264,671 B2
• Filed: 04/04/2006
• Issued: 09/04/2007
• Est. Priority Date: 04/05/2005
• Status: Expired due to Fees

• Current Assignee: Universitat Hannover
• Original Assignee: Universitat Hannover
• Inventors: Locmelis, Sonja, Binnewies, Michael
• Primary Examiner(s): Lorengo; J. A.
• Assistant Examiner(s): Parvini; Pegah
• Application Number:
  US11/396,900
• Publication Number:
  US 20060222605A1
• Time in Patent Office: 518 Days
• Field of Search: 106/427, 106/419, 252/301.6 R, 252/301.6 S, 252/588, 424/401, 424/59, 424/641, 502/216, 423/518, 423/566.1
• US Class Current: 106/427
• CPC Class Codes: A61K 33/12 Magnesium silicate
• CPC Class Codes: A61K 33/24 Heavy metals; Compounds thereof
• CPC Class Codes: A61K 33/30 Zinc; Compounds thereof
• CPC Class Codes: C01G 9/00 Compounds of zinc
• CPC Class Codes: C01G 9/006 Compounds containing, besides zinc, two ore more other elements, with the exception of oxygen or hydrogen
• CPC Class Codes: C01P 2002/30 Three-dimensional structures
• CPC Class Codes: C01P 2002/70 defined by measured X-ray, neutron or electron diffraction data
• CPC Class Codes: C08K 3/22 of metals
• CPC Class Codes: C08K 3/30 Sulfur-, selenium- or tellurium-containing compounds
• CPC Class Codes: C09C 1/04 Compounds of zinc C09C1/0003, C09C1/0009, C09C1/0015, C09C1/0078 take precedence
• CPC Class Codes: C09D 7/61 inorganic
• CPC Class Codes: C09D 7/68 Particle size between 100-1000 nm
• CPC Class Codes: C09D 7/69 Particle size larger than 1000 nm

Abstract

The present invention relates to particles or powders of a compound of formula Zn_1−yM_yO_1−xS_x, wherein x has a value in the range from 0.01 to 0.08, M represents a divalent metal and y has a value in the range from 0 to 0.2, the compound having a wurtzite structure.

Claims

1. Particle or powder of a compound of formula Zn₁₋

yM_yO<sub>1−

x</sub>S_x, wherein;

x has a value in the range from 0.01 to 0.08,

M represents a divalent metal,

y has a value in the range from 0 to 0.2, and the compound has a wurtzite structure.

2. Particle or powder according to claim 1, wherein y has a value in the range from 0 to 0.0002.

3. Particle or powder according to claim 1, wherein x has a value in the range from 0.01 to 0.05.

4. Particle or powder according to claim 1, wherein the particle or powder is single-phase.

5. Particle or powder according to claim 1, wherein the particle has a particle size or the powder has a mean grain size of 300 nm or more.

6. Particle or powder according to claim 5, wherein the particle has a particle size or the powder has a mean grain size in the range from 1 to 500 μ

m.

7. Particle or powder according to claim 1, wherein M is selected from the group consisting of:

Cr, Mn, Fe, Co, Ni, Cu, Cd and Mg.

8. Article comprising particles or powder according to claim 1.

9. Article according to claim 8, wherein the article comprises the particles or powder in the region of its surface, so that the particles or powder are able to develop a UV-absorbing action when the article is used.

10. Article according to claim 9, wherein the article is a cosmetic or pharmaceutical preparation, a plastics material, a paint or a surface coating.

11. Article according to claim 8, wherein the article comprises said particles or powder in an antimicrobially effective amount and/or in an amount that promotes the healing of wounds.

12. An ultraviolet light absorbent composition comprising a particle or powder according to claim 1.

13. Process for the preparation of powders according to claim 1, comprising the following step:

heating ZnO and ZnS together in the presence of a halogen or halogen compound.

14. Process for the preparation of powders according to claim 13, comprising the following steps:

producing an aqueous suspension of zinc hydroxide,

contacting the zinc hydroxide with sulfide anions so that a reaction precipitate forms, and

subjecting the reaction precipitate to heat.

15. Method of absorbing UV radiation, comprising the following step:

exposing a particle or powder according to claim 1 to UV radiation.