Nanosize metal oxide particles for producing transparent metal oxide colloids and ceramers

• US 6,432,526 B1
• Filed: 11/19/2001
• Issued: 08/13/2002
• Est. Priority Date: 05/27/1999
• Status: Expired due to Term

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Wood, Thomas E., Arney, David S.
• Primary Examiner(s): Le, Hoa T.
• Application Number:
  US09/992,713
• Publication Number:
  US 20020119304A1
• Time in Patent Office: 267 Days
• Field of Search: 428/328, 428/332, 428/338, 428/339
• US Class Current: 428/328
• CPC Class Codes: C01P 2002/60 Compounds characterised by their crystallite size
• CPC Class Codes: C01P 2002/77 by unit-cell parameters, atom positions or structure diagrams
• CPC Class Codes: C01P 2006/60 Optical properties, e.g. expressed in CIELAB-values
• CPC Class Codes: C09C 1/3684 Treatment with organo-silicon compounds
• CPC Class Codes: Y10T 428/256 Heavy metal or aluminum or compound thereof
• CPC Class Codes: Y10T 428/26 Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
• CPC Class Codes: Y10T 428/268 Monolayer with structurally defined element
• CPC Class Codes: Y10T 428/269 including synthetic resin or polymer layer or component
• CPC Class Codes: Y10T 428/2949 Glass, ceramic or metal oxide in coating
• CPC Class Codes: Y10T 428/2991 Coated
• CPC Class Codes: Y10T 428/2995 Silane, siloxane or silicone coating
• CPC Class Codes: Y10T 428/2996 Glass particles or spheres
• CPC Class Codes: Y10T 428/31663 As siloxane, silicone or silane

Abstract

The present invention relates to metal oxide particles capable of being highly dispersed in organic materials to form transparent colloids and ceramers. The metal oxide particles of the present invention have surfaces attached to a dispersing aid and a degree of crystallinity of greater than 55 percent. The crystallite diameter of the metal oxide particles is greater than about 4 nanometers and less than about 20 nanometers. The present invention also relates to the colloids and ceramers prepared using these metal oxide particles and the methods associated with the preparation of the particles, colloids, and ceramers.

Claims

1. A ceramer article comprising inorganic particles dispersed in an organic matrix, said inorganic particles comprising:

(a) titanium based oxide particles having a dispersing aid attached thereto and having a degree of crystallinity of greater than 55 percent;

(b) a crystallite diameter greater than about 4 nanometers and less than about 20 nanometers; and

(c) an absorptivity of less than about 3.00 as a colloid.

2. The ceramer article of claim 1, wherein the organic matrix is prepared from precursors substantially free of an agent selected from the group consisting of water, alcohols, and combinations thereof.

3. The ceramer article of claim 1, wherein the organic matrix is prepared from polymer precursors selected from the group consisting of molecules possessing ethylenically unsaturated polymerizable olefins, and combinations thereof.

4. The ceramer article of claim 1, wherein the organic matrix is a polyacrylate.

5. The ceramer article of claim 1, having a geometric shape.

6. The ceramer article of claim 5, wherein the geometric shape includes a sphere, square, cylinder, pyramid, or cone.

7. The ceramer article of claim 1 having an irregular shape.

8. The ceramer article of claim 1, wherein the article is a light management device.

9. The ceramer article of claim 1 wherein the ceramer has a refractive index greater than about 1.6.

10. The ceramer article of claim 1, wherein the article has a refractive index greater than about 1.6 and less than about 2.01.

11. The ceramer article of claim 1, wherein the organic matrix is prepared from a composition comprising at least one polymer precursor curable by a free radical mechanism.

12. A coated article comprising a substrate with a surface attached to at least one layer of a coating wherein the substrate, the coating, or both, comprise a ceramer including inorganic particles dispersed in an organic matrix, said organic particles comprising:

(a) titanium based oxide particles having a dispersing aid attached thereto and having a degree of crystallinity of greater than 55 percent;

(b) a crystallite diameter greater than about 4 nanometers and less than about 20 nanometers; and

(c) an absorptivity of less than about 3.00 as a colloid.

13. The coated article of claim 12, wherein at least one layer of coating comprises the ceramer.

14. The coated article of claim 12, wherein the at least one layer of coating has a refractive index greater than about 1.6.

15. The coated article of claim 12, wherein the substrate comprises the ceramer.

16. The coated article of claim 12, wherein the substrate and the coating comprise the ceramer.

17. The coated article of claim 12, wherein the organic matrix is prepared from a composition comprising at least one polymer precursor curable by a free radical mechanism.

18. The coated article of claim 12, wherein the organic matrix is prepared from at least one polymer precursor selected from the group of molecules possessing ethylenically unsaturated polymerizable olefin, and combinations thereof.

19. The coated article of claim 12, wherein the organic matrix is polyacrylate.

20. The coated article of claim 12, wherein the substrate is selected from the group consisting of glass, plastic, and metal.

21. The coated article of claim 12, wherein the substrate is selected from the group consisting of lenses, sheets, fibers, prisms, computer screens, and CRT face plates.