Polymerizable oligomeric urethane compositions comprising nanoparticles

• US 7,326,448 B2
• Filed: 03/10/2006
• Issued: 02/05/2008
• Est. Priority Date: 02/17/2005
• Status: Expired due to Fees

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Goenner, Emily S., Jones, Clinton L., Kolb, Brant U., Olson, David B.
• Primary Examiner(s): WU, SHEAN CHIU
• Application Number:
  US11/276,691
• Publication Number:
  US 20070212533A1
• Time in Patent Office: 697 Days
• Field of Search: 428/1.1, 428/411.1, 428/446, 428/457, 428/688, 428/1.3, 428/1.52, 428/1.55, 428/424.2, 428/425.5, 977/778, 977/840, 977/932, 977/939, 526/318.43, 526/321
• US Class Current: 428/1.1
• CPC Class Codes: B82Y 20/00 Nanooptics, e.g. quantum optics or photonic crystals
• CPC Class Codes: C08G 18/42 Polycondensates having carboxylic or carbonic ester groups in the main chain
• CPC Class Codes: C08G 18/672 Esters of acrylic or alkyl acrylic acid having only one group containing active hydrogen
• CPC Class Codes: C08K 3/22 of metals
• CPC Class Codes: C08K 9/06 with silicon-containing compounds
• CPC Class Codes: C08L 75/16 having terminal carbon-to-carbon unsaturated bonds
• 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 2323/053 Organic silicon compound, e.g. organosilicon
• CPC Class Codes: C09K 2323/059 Unsaturated aliphatic polymer, e.g. vinyl
• CPC Class Codes: G02B 2207/101 Nanooptics
• CPC Class Codes: G02B 5/045 Prism arrays
• CPC Class Codes: G02B 5/124 plural reflecting elements forming part of a unitary plate or sheet
• CPC Class Codes: G02B 6/0053 Prismatic sheet or layer; Brightness enhancement element, sheet or layer
• CPC Class Codes: G02B 6/0056 for producing polarisation effects, e.g. by a surface with polarizing properties or by an additional polarizing elements
• CPC Class Codes: Y10S 428/913 Material designed to be responsive to temperature, light, moisture
• CPC Class Codes: Y10S 977/778 within specified host or matrix material, e.g. nanocomposite films
• CPC Class Codes: Y10S 977/932 for electronic or optoelectronic application
• CPC Class Codes: Y10T 428/2457 Parallel ribs and/or grooves
• CPC Class Codes: Y10T 428/259 Silicic material
• CPC Class Codes: Y10T 428/31551 : Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
• CPC Class Codes: Y10T 428/31573 : Next to addition polymer of ethylenically unsaturated monomer
• CPC Class Codes: Y10T 428/31598 : Next to silicon-containing [silicone, cement, etc.] layer
• CPC Class Codes: Y10T 428/31855 : Of addition polymer from unsaturated monomers

Abstract

Presently described are microstructured articles such as a brightness enhancing film or optical turning film. The microstructured articles comprise a brightness enhancing polymerized structure comprising the reaction product of a composition comprising an organic component having at least one oligomeric urethane (meth)acrylate and surface modified silica nanoparticles.

Claims

1. A brightness enhancing film comprising:

a brightness enhancing polymerized structure comprising the reaction product of a composition comprising an organic component having at least one aliphatic oligomeric urethane (meth)acrylate and surface modified silica nanoparticles.

2. The brightness enhancing film according to claim 1, wherein the polymerized structure has a plurality of ridges extending along a first surface.

3. The brightness enhancing film according to claim 1, wherein the silica nanoparticles have a primary particle size greater than 1 nm and less than 100 nm.

4. The brightness enhancing film according to claim 1, wherein the silica nanoparticles have a primary particle size is from 5 to 75 nm.

5. The brightness enhancing film according to claim 1, wherein the silica nanoparticles have a primary particle size ranging from 10 to 30 nm.

6. The brightness enhancing film according to claim 1, wherein the silica comprises 10 to 60 wt-% of the polymerized structure.

7. The brightness enhancing film according to claim 1, wherein the silica comprises 10 to 40 wt-% of the polymerized structure.

8. The brightness enhancing film according to claim 1, wherein the composition further comprise nanoparticles selected from zirconia, titania, antimony oxides, alumina, tin oxides, mixed metal oxides thereof, or mixtures thereof.

9. The brightness enhancing film according to claim 1, wherein the surface modified nanoparticles are polymerizable with the organic component.

10. The brightness enhancing film according to claim 1 wherein the composition comprises a photoinitiator.

11. The brightness enhancing film of claim 1 wherein the oligomeric urethane (meth) acrylate is a oligomeric multi(meth)acrylate.

12. The brightness enhancing film article according to claim 1 wherein the oligomeric urethane (meth)acrylate is the reaction product of 2,2,4-trimethylhexane 1,6-diisocyanate, polycaprolactone diol and 2-hydroxyethyl methacrylate.

13. The brightness enhancing film according to claim 1 wherein the organic component comprises at least one monomer selected from (meth)acrylate monomers, styrenic monomers, and ethylenically unsaturated nitrogen containing heterocyclic monomers.

14. The brightness enhancing film according to claim 13 wherein the monomer is a polyol multi(meth)acrylate.

15. The brightness enhancing film according to claim 14 wherein said polyol (meth)acrylate is hexanediol diacrylate.

16. The brightness enhancing film according to claim 1, further comprising a base layer optically coupled to the polymerized structure.

17. The brightness enhancing film according to claim 16, wherein the base layer comprises styrene-acrylonitrile, cellulose triacetate, polymethyl methacrylate, polyester, polycarbonate, polyethylene naphthalate, copolymers of naphthalene dicarboxylic acids, or mixtures thereof.

18. The brightness enhancing film according to claim 16 wherein the base layer is a polarizing layer.

19. A brightness enhancing film comprising:

a brightness enhancing polymerized structure comprising the reaction product of a composition comprising an organic component having about 30-100% by weight of oligomeric urethane (meth)acrylate and surface modified silica nanoparticles.

20. A brightness enhancing film comprising:

a brightness enhancing polymerized structure comprising the reaction product of a composition comprising an organic component having at least one oligomeric urethane (meth)acrylate and surface modified silica nanoparticles;

wherein the cured organic component has a glass transition temperature of at least 35°

C.