Triphenyl monomers suitable for microstructured optical films

Patent metadata

Field	Value
Publication number	US-9885807-B2
Application number	US-201514947421-A
Country	US
Kind code	B2
Filing date	Nov 20, 2015
Priority date	Mar 9, 2007
Publication date	Feb 6, 2018
Grant date	Feb 6, 2018

Abstract

Optical films are described having a polymerized microstructured surface that comprises the reaction product of a polymerizable resin composition comprising at least one polymerizable ethylenically unsaturated triphenyl monomer. Also described are certain triphenyl (meth)acrylate monomers and polymerizable resin compositions.

First claim

What is claimed is:

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 triphenyl monomer having the general structure

wherein R2-1, R2-2, and R2-3 comprise a substituent comprising a (meth)acrylate group or R2-2 is H and R2-1 and R2-3 comprise a substituent comprising a (meth)acrylate group;
X is independently halogen, aryl, hydroxyl, or a C 1 to C 12 alkyl group;
R3 is independently hydrogen, aryl, or a C 1 to C 12 alkyl group; and
p is 0 to 5.

2. The optical film of claim 1 wherein p is 0.

3. The optical film of claim 1 wherein R2-1, R2-2, and R2-3 are independently a (meth)acrylate substitutent selected from

wherein Q is O or S;
L is a C 2 to C 6 alkylene group optionally substituted with a one or more hydroxyl groups;
n ranges from 0 to 10;
R1 is H or CH 3 ; and
R3 is hydrogen, aryl, or a C 1 to C 12 alkyl group.

4. The optical film of claim 3 wherein Q is O.

5. The optical film of claim 3 wherein L is C 2 or C 3 and n is 1.

6. The optical film of claim 1 wherein the polymerizable resin composition comprises up to 50 wt-% of one or more triphenyl (meth)acrylate monomers; and
25 wt-% to 75 wt-% of one or more multi(meth)acrylate monomers or oligomers having at least two polymerizable (meth)acrylate groups.

7. The optical film of claim 1 wherein the multi(meth)acrylate monomer comprises one or more bisphenol A (meth)acrylates, aromatic epoxy (meth)acrylates, and mixtures thereof.

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

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

10. The optical film of claim 1 wherein the polymerizable resin is free of inorganic nanoparticles.

11. The optical film of claim 1 wherein the polymerizable resin comprises at least 10 wt-% of surface modified inorganic nanoparticles.

12. The optical film of claim 11 wherein the inorganic nanoparticles have a refractive index of at least 1.68.

13. The optical film of claim 12 wherein the inorganic nanoparticles comprise zirconia.

14. 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.

Assignees

• 3M Innovative Properties Co

Inventors

• Hunt Bryan V
• Lindstrom Kyle J
• Invie Judith M
• Olson David B
• Renstrom Anthony M

Classifications

• G02F1/133504

  Diffusing, scattering, diffracting elements (associated to illuminating devices G02F1/133606) · CPC title

• G02B5/0231

  the surface having microprismatic or micropyramidal shape (macroscopic prism arrays G02B5/045) · CPC title

• C08F32/06

  having two or more carbon-to-carbon double bonds · CPC title

• C07C69/78

  Benzoic acid esters · CPC title

• C08J2335/02

  Characterised by the use of homopolymers or copolymers of esters (C08J2335/06, C08J2335/08 take precedence) · CPC title