High refractive index inorganic oxide nanoparticles comprising surface treatment and polymerizable resin

• US 8,535,576 B2
• Filed: 08/30/2012
• Issued: 09/17/2013
• Est. Priority Date: 12/15/2008
• Status: Active Grant

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Jones, Clinton L., Kolb, Brant U., McKenzie, Taun L., Olson, David B., Naismith, Nathan K.
• Primary Examiner(s): Ahvazi, Bijan
• Application Number:
  US13/598,681
• Publication Number:
  US 20120329959A1
• Time in Patent Office: 383 Days
• Field of Search: 106/447, 106/450, 106/499, 106/505, 252/301.21, 252/585, 349/62, 349/96, 428/1.1, 428/1.3, 428/1.51, 428/1.54, 428/1.55, 428/147, 428/148, 428/500, 523/202, 523/210, 524/413, 556/51, 977/773, 525/451
• US Class Current: 252/585
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: C01P 2004/64 Nanometer sized, i.e. from 1-100 nanometer
• CPC Class Codes: C08K 5/11 of acyclic polycarboxylic acids
• CPC Class Codes: C09C 1/00 Treatment of specific inorganic materials other than fibrous fillers tenebrescent materials C09K9/00; luminescent materials C09K11/00; Preparation of carbon black
• CPC Class Codes: C09C 1/3676 Treatment with macro-molecular organic compounds
• CPC Class Codes: C09C 3/10 Treatment with macromolecular organic compounds C09C3/006 takes precedence
• CPC Class Codes: C09K 2323/00 Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
• CPC Class Codes: C09K 2323/03 Viewing layer characterised by chemical composition
• CPC Class Codes: C09K 2323/051 Inorganic, e.g. glass or silicon oxide
• CPC Class Codes: C09K 2323/057 Ester polymer, e.g. polycarbonate, polyacrylate or polyester
• CPC Class Codes: C09K 2323/059 Unsaturated aliphatic polymer, e.g. vinyl
• CPC Class Codes: G02B 1/04 made of organic materials, e.g. plastics G02B1/08 takes precedence
• CPC Class Codes: G02B 1/08 made of polarising materials
• CPC Class Codes: G02B 6/0053 Prismatic sheet or layer; Brightness enhancement element, sheet or layer
• CPC Class Codes: Y10T 428/24355 Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
• CPC Class Codes: Y10T 428/24405 Polymer or resin [e.g., natural or synthetic rubber, etc.]
• CPC Class Codes: Y10T 428/24413 Metal or metal compound
• CPC Class Codes: Y10T 428/31855 Of addition polymer from unsaturated monomers

Abstract

Inorganic nanoparticles having a refractive index of at least 1.60 wherein the nanoparticles are surface modified with a surface treatment comprising a compound comprising a carboxylic acid end group and a C₃-C₈ ester repeat unit.

Claims

1. Inorganic nanoparticles having a refractive index of at least 1.60 wherein the nanoparticles are surface modified with a surface treatment comprising a compound comprising a carboxylic acid end group and a C₃-C₈ ester repeat unit

having the general formula:

2. The inorganic nanoparticles of claim 1, wherein L2 is a C₆-C₈ alkyl group.

3. The inorganic nanoparticles of claim 1, wherein n averages 1.5 to 2.5.

4. The inorganic nanoparticles of claim 1, wherein Z comprises a C₂-C₈ alkyl group.

5. The inorganic nanoparticles of claim 1, wherein Z comprises a (meth)acrylate end group.

6. The inorganic nanoparticles of claim 1, wherein the surface treatment comprises the reaction product of

i) at least one aliphatic anhydride, and

ii) at least one hydroxy polycaprolactone(meth)acrylate.

7. The inorganic nanoparticles of claim 1, wherein the surface treatment further comprises a second compound comprising a (meth)acrylate end group.

8. The inorganic nanoparticles of claim 7, wherein the second compound is prepared by the reaction of an aliphatic anhydride and a hydroxyl C₂-C₈ alkyl(meth)acrylate.

9. The inorganic nanoparticles of claim 1, wherein the inorganic nanoparticles comprise zirconia.

10. A polymerizable resin comprising an organic component and the inorganic nanoparticles of claim 1.

11. The polymerizable resin composition of claim 10, wherein the polymerizable resin composition has a refractive index of at least 1.61.

12. The polymerizable resin composition of claim 10, wherein the polymerizable resin composition has a refractive index of at least 1.650.

13. The polymerizable resin composition of claim 10, wherein the organic component comprises at least one biphenyl monomer.

14. The polymerizable resin composition of claim 10, wherein the organic component further comprises one or more monofunctional (meth)acrylate monomers having a refractive index lower than the biphenyl monomer.

15. The polymerizable resin composition of claim 10, wherein the inorganic nanoparticles are present in an amount ranging from 40 wt.-% to 60 wt.-% of the polymerizable resin.