Optical films comprising fluorenol (meth)acrylate monomer

• US 7,981,986 B2
• Filed: 04/29/2008
• Issued: 07/19/2011
• Est. Priority Date: 04/29/2008
• Status: Active Grant

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Lindstrom, Kyle J., Hunt, Bryan V.
• Primary Examiner(s): Jagannathan; Vasu
• Assistant Examiner(s): Reddy; Karuna P
• Application Number:
  US12/111,235
• Publication Number:
  US 20090270576A1
• Time in Patent Office: 1,176 Days
• Field of Search: 526/280, 526/319, 526/321, 526/326
• US Class Current: 526/280
• CPC Class Codes: C08F 220/30 containing aromatic rings in the alcohol moiety
• CPC Class Codes: C08F 220/301 and one oxygen in the alcohol moiety
• CPC Class Codes: C08F 220/306 and polyethylene oxide chain in the alcohol moiety
• CPC Class Codes: C08F 222/10 Esters

Abstract

Microstructured optical films and polymerizable resin compositions comprising at one aromatic monomer or oligomer having at least two polymerizable (meth)acrylate groups and a fluorenol (meth)acrylate monomer.

Claims

1. An optical film comprising a polymerized microstructured surface wherein the polymerized microstructured surface comprises the reaction product of a polymerizable resin composition comprising at least one aromatic monomer or oligomer having at least two polymerizable (meth)acrylate groups and at least one fluorenol (meth)acrylate monomer having the general structure:

2. The optical film of claim 1 wherein the polymerizable resin composition comprises at least 5 wt-% of the fluorenol (meth)acrylate monomer.

3. The optical film of claim 1 wherein the polymerizable resin composition comprises up to 50 wt-% of the fluorenol (meth)acrylate monomer.

4. The optical film of claim 1 wherein the polymerizable resin comprises 25 wt-% to 50 wt-% of the aromatic monomer or oligomer having at least two polymerizable (meth)acrylate groups.

5. The optical film of claim 1 wherein the aromatic monomer or oligomer having at least two polymerizable (meth)acrylate groups comprise at least two aromatic rings.

6. The optical film of claim 1 wherein the aromatic monomer or oligomer having at least two polymerizable (meth)acrylate groups has a molecular weight of at least 350 g/mole.

7. The optical film of claim 1 wherein the aromatic monomer or oligomer has the formula

8. The optical film of claim 1 wherein the aromatic monomer or oligomer has the formula

9. The optical film of claim 1 wherein the fluorenol (meth)acrylate monomer is

10. The optical film of claim 1 wherein polymerizable composition has a refractive index of at least 1.54.

11. The optical film of claim 1 wherein the polymerizable resin composition comprises less than 1 wt-% total of chlorine, bromine, or mixtures thereof.

12. The optical film of claim 1 wherein the polymerizable resin composition comprises less that 1 wt-% total of chlorine, bromine, fluorine and iodine.

13. 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.