Triphenyl monomers suitable for microstructured optical films

Patent metadata

Field	Value
Publication number	US-2016109618-A1
Application number	US-201514947421-A
Country	US
Kind code	A1
Filing date	Nov 20, 2015
Priority date	Mar 9, 2007
Publication date	Apr 21, 2016
Grant date	—

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 is independently H or a substituent comprising a (meth)acrylate group and at least two R2 substituents comprise 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 is 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 triphenyl monomer is a di(meth)acrylate.

7 . The optical film of to claim 1 wherein the triphenyl monomer is a tri(meth)acrylate.

8 . 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.

9 . 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.

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

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

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

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

14 . The optical film of claim 13 wherein the inorganic nanoparticles have a refractive index of at least 1.68.

15 . The optical film of claim 14 wherein the inorganic nanoparticles comprise zirconia.

16 . 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

• C08J2335/02

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

• G02B1/04 Primary

  made of organic materials, e.g. plastics (G02B1/08 takes precedence) · CPC title

• G02F2001/133507

  Physics · mapped topic

• G02B5/0231

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

• G02F1/133504

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