Thin microstructured optical films

Patent metadata

Field	Value
Publication number	US-9360592-B2
Application number	US-201514618161-A
Country	US
Kind code	B2
Filing date	Feb 10, 2015
Priority date	Jul 9, 2007
Publication date	Jun 7, 2016
Grant date	Jun 7, 2016

Abstract

Presently described are optical films, such as a brightness enhancing film, having a polymerized microstructured surface disposed on a preformed polymeric film wherein the film has a thickness of no greater than 3 mils and the polymerized microstructured surface consists of the reaction product of a substantially non-brominated polymerizable resin composition.

First claim

What is claimed is:

1. A brightness enhancing film having a polymerized microstructured surface disposed on a preformed polymeric polyethylene terephthalate film wherein the preformed polyethylene terephthalate polymeric film has a thickness of less than or equal to 3 mils and the polymerized microstructured surface consists of a reaction product of a non-brominated polymerizable resin composition comprising
i) at least about 60 wt-% of one or more bisphenol di(meth)acrylate monomers, aromatic epoxy di(meth)acrylate oligomers, or mixtures thereof;
comprising the general structure

wherein
Z is independently —C(CH 3 ) 2 —;
Q is independently O,
each R1 is independently hydrogen or methyl, and
L is —CH 2 CH(OH)CH 2 — and n is 1, or L is C 2 and n is 2 or 5,
ii) about 5 wt-% to about 40 wt-% of one or more (meth)acrylate diluents selected from the group consisting of
phenoxy ethyl acrylate, 2-phenyl-phenyl acrylate, tetraethylene glycol diacrylate, 2-phenyl-phenoxyethyl acrylate, benzyl acrylate, phenyl thiol acrylate, and mixtures thereof;

wherein the polymerizable composition comprises 0 to 15 wt-% of components comprising three or more (meth)acrylate groups; and the brightness enhancing film exhibits curl from 0 mm to less than 2 mm.

2. The brightness enhancing film of claim 1 wherein the non-brominated polymerizable resin composition comprises at least about 65 wt-% of one or more bisphenol di(meth)acrylate monomers, aromatic epoxy di(meth)acrylate oligomers, or a mixture thereof.

3. The brightness enhancing film of claim 1 wherein the non-brominated polymerizable resin composition comprises at least about 70 wt-% of one or more bisphenol di(meth)acrylate monomers, aromatic epoxy di(meth)acrylate oligomers, or a mixture thereof.

4. The brightness enhancing film of claim 1 wherein the non-brominated polymerizable resin composition is substantially free of components having three or more (meth)acrylate groups.

5. The brightness enhancing film of claim 1 wherein the preformed polymeric film has a thickness of less than or equal to about 1 mil.

6. The brightness enhancing film of claim 1 wherein the non-brominated polymerizable resin composition is non-halogenated.

7. The brightness enhancing film of claim 1 wherein the polymerized microstructured surface is a prismatic structure having a distance between prism peaks of between 10 and 35 microns, and a prism height of between 5 and 18 microns.

8. An optical film having a polymerized microstructured surface disposed on a preformed polyethylene terephthalate polymeric film wherein the preformed polymeric polyethylene terephthalate film has a thickness of less than or equal to 2 mils and the polymerized microstructured surface consists of a reaction product of a non-brominated polymerizable resin composition comprising
i) at least about 60 wt-% of one or more bisphenol di(meth)acrylate monomers, aromatic epoxy di(meth)acrylate oligomers, or mixtures thereof;
comprising the general structure

wherein
Z is independently —C(CH 3 ) 2 —;
Q is independently O,
each R1 is independently hydrogen or methyl, and
L is —CH 2 CH(OH)CH 2 — and n is 1, or L is C 2 and n is 2 or 5,
ii) about 5 wt-% to about 40 wt-% of one or more (meth)acrylate diluents selected from the group consisting of
phenoxy ethyl acrylate, 2-phenyl-phenyl acrylate, tetraethylene glycol diacrylate, 2-phenyl-phenoxyethyl acrylate, benzyl acrylate, phenyl thiol acrylate, and mixtures thereof;

wherein the polymerizable composition comprises 0 to 15 wt-% of components comprising three or more (meth)acrylate groups; and optical film exhibits curl from 0 mm to less than 2 mm.

Assignees

• 3M Innovative Properties Co

Inventors

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

Classifications

• C09D4/06

  {Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond} in combination with a macromolecular compound other than an unsaturated polymer of groups C09D159/00 - C09D187/00 · CPC title

• G02B1/04 Primary

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

• G02B6/0053

  Prismatic sheet or layer; Brightness enhancement element, sheet or layer · CPC title

• C08F290/06 Primary

  Polymers provided for in subclass C08G · CPC title

• Y10T428/265

  1 mil or less · CPC title