Optical films comprising phenyl ethylene (meth)acrylate monomers

• US 8,080,608 B2
• Filed: 05/19/2009
• Issued: 12/20/2011
• Est. Priority Date: 06/03/2008
• Status: Active Grant

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Hunt, Bryan V., Lindstrom, Kyle J., DiZio, James P.
• Primary Examiner(s): BERNSHTEYN, MICHAEL
• Application Number:
  US12/936,552
• Publication Number:
  US 20110086972A1
• Time in Patent Office: 945 Days
• Field of Search: 524/556, 526/320, 526/326, 977/773
• US Class Current: 524/556
• CPC Class Codes: B29K 2033/12 Polymers of methacrylic acid esters, e.g. PMMA, i.e. polymethylmethacrylate
• CPC Class Codes: C08F 220/40 Esters of unsaturated alcohols , e.g. allyl (meth)acrylate
• CPC Class Codes: Y10S 977/773 Nanoparticle, i.e. structure having three dimensions of 100 nm or less

Abstract

Presently described are (e.g. microstructured) optical films and polymerizable resin compositions comprising at least one (meth)acrylate monomer comprising an unsubstituted or substituted phenyl ethylene group referred to as phenyl ethylene (meth)acrylate monomers.

Claims

1. An optical film wherein the film comprises a polymerized microstructured surface comprising the reaction product of a polymerizable resin composition comprising at least one (meth)acrylate monomer comprising a phenyl ethylene group, wherein the (meth)acrylate monomer has a refractive index of at least 1.54 and a structure is selected from:

A)

2. The optical film according to claim 1 wherein the (meth)acrylate monomer has a refractive index of at least 1.60.

3. The optical film according to claim 1 wherein the (meth)acrylate monomer has a viscosity of less than 100 cps at 25°

C.

4. The optical film of claim 1 wherein t is 0.

5. The optical film of claims 1 wherein R3 is H.

6. The optical film of claim 1 wherein the (meth)acrylate monomer has the structure A and R3 is independently selected from a C2-C12 alkyl group, halogen, alkyaryl, an ether group, and a nitro group.

7. The optical film of claim 1 wherein n is 0.

8. The optical film of claim 1 wherein the (meth)acrylate monomer has the structure B and R3 is independently selected from a C2-C12 alkyl, a halogen, and an ether group.

9. The optical film of claim 1 wherein the (meth)acrylate monomer has the structure B and R4 is selected from the group consisting of

10. The optical film of claim 1 wherein the monomer is a mono(meth)acrylate monomer.

11. The optical film of claim 1 wherein the polymerizable resin composition comprises one or more aromatic monomers or oligomers having at least two aromatic groups and at least two (meth)acrylate groups.

12. The optical film of claim 11 wherein the polymerizable resin comprises 25 wt-% to 75 wt-% of the aromatic monomers or oligomers having at least two aromatic groups and at least two (meth)acrylate groups.

13. The optical film of claim 11 wherein the aromatic monomer or oligomer having at least two aromatic groups and at least two polymerizable (meth)acrylate groups has a molecular weight of at least 350 g/mole.

14. The optical film of claim 11 wherein the aromatic monomer or oligomer has the structure

15. The optical film of claim 11 wherein the aromatic monomer or oligomer has the structure

16. The optical film of claim 1 wherein the polymerizable resin composition is non-halogenated.

17. The optical film of claim 1 wherein the optical film is a brightness enhancing film having a single sheet gain of at least 1.59.

18. The optical film of claim 1 wherein the polymerizable resin composition comprises inorganic nanoparticles.