Benzyl (meth)acrylate monomers suitable for microstructured optical films

Patent metadata

Field	Value
Publication number	US-9880322-B2
Application number	US-201213985058-A
Country	US
Kind code	B2
Filing date	Apr 25, 2012
Priority date	May 13, 2011
Publication date	Jan 30, 2018
Grant date	Jan 30, 2018

Abstract

Presently described are optical films comprising a polymerized (e.g. microstructured) surface that comprises the reaction product of a polymerizable resin composition and polymerizable resin compositions that comprise nanoparticles; at least one first monomer comprising at least two (meth)acrylate groups; and at least one second (meth)acrylate monomer having following the structure (I); wherein at least one R1 comprises an aromatic substituent, t is an integer from 1 to 4, and R2 is hydrogen or methyl.

First claim

What is claimed is:

1. An optical film comprising a preformed polymeric film base layer and a polymerized microstructured optical layer, the polymerized microstructured optical layer comprising a linear array of regular prisms, the prisms having apex angles ranging from 80° to 100° and peaks with a spacing ranging from 5 to 300 microns wherein the polymerized microstructured optical layer comprises the reaction product of a polymerizable resin composition comprising
zirconia nanoparticles wherein the amount of zirconia nanoparticles ranges from 10 wt-% to 70 wt-%;
5 wt-% to 30 wt-% of one or more first monomers comprising at least two (meth)acrylate groups and two aromatic rings selected from bisphenol or biphenyl (meth)acrylate monomer; and mono(meth)acrylate monomer(s) consisting of one or more second acrylate monomers having the structure

wherein R1 is

t is 1, and
R2 is hydrogen; and wherein the polymerizable resin comprises at least 10 wt.-% of the second acrylate monomer(s).

2. The optical film of claim 1 wherein the optical film is a brightness enhancing film.

3. The optical film of claim 2 wherein the brightness enhancing film has a single sheet relative gain of at least 1.75.

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

5. The optical film of claim 1 wherein the polymerizable resin comprises up to 15 wt-% of one or more first monomers comprising at least two (meth)acrylate groups.

6. The optical film of claim 1 wherein the first monomer comprising at least two (meth)acrylate groups has a molecular weight of at least 350 g/mole.

7. The optical film of claim 1 wherein the second monomer has a refractive index of at least 1.54.

8. The optical film of claim 1 wherein the second monomer has a viscosity of less than 100 cps at 25° C.

9. The optical film of claim 1 wherein the amount of zirconia nanoparticles is no greater than 60 wt-% of the polymerizable resin composition.

10. The optical film of claim 1 wherein the polymerizable resin comprises 30 wt-% to 60 wt-% zirconia nanoparticles.

Assignees

• Hunt Bryan V
• Lindstrom Kyle J
• Nelson Maureen C
• 3M Innovative Properties Co

Inventors

• Hunt Bryan V
• Lindstrom Kyle J
• Nelson Maureen C

Classifications

• C08J7/16

  with polymerisable compounds · CPC title

• C08K2003/2244

  of zirconium · CPC title

• G02B1/04 Primary

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

• C08K3/22

  of metals · CPC title

• G02B1/10

  Optical coatings produced by application to, or surface treatment of, optical elements (G02B1/08 takes precedence) · CPC title