Composition comprising surface modified high index nanoparticles suitable for optical coupling layer

Patent metadata

Field	Value
Publication number	US-10644267-B2
Application number	US-201715725020-A
Country	US
Kind code	B2
Filing date	Oct 4, 2017
Priority date	Feb 28, 2012
Publication date	May 5, 2020
Grant date	May 5, 2020

Abstract

Presently described is a method for coupling an optical film to a substrate, laminated optical constructions comprising an optical film and an optical coupling layer disposed on a surface layer of the optical film, and coating compositions useful for optical an optical coupling layer. The coating compositions comprise at least 40 wt.-% inorganic nanoparticles having a refractive index of at least 1.85 and a polymeric silane surface treatment.

First claim

What is claimed is:

1. A coating composition comprising:
at least 40 wt.-% inorganic nanoparticles having a refractive index of at least 1.85; and a polymeric silane surface treatment having a weight average molecular weight ranging from 1000 to 5000 g/mole; wherein the polymeric silane surface treatment is the sole polymeric component of the coating composition; and wherein the coating composition has a refractive index of at least 1.65 and a peak peel force of at least 50 g/cm.

2. The coating composition of claim 1 wherein the polymeric silane surface treatment comprises a random acrylic copolymer comprising at least 50 wt.-% of repeat units derived from one or more alkyl (meth)acrylate monomers comprising 4 to 18 carbon atoms.

3. The coating composition of claim 1 wherein the polymeric silane surface treatment further comprises a terminal alkoxy silane group.

4. The coating composition of claim 1 wherein the polymeric silane surface treatment has a Tg ranging from −20° C. to −80° C.

5. The coating composition of claim 1 wherein the inorganic nanoparticles further comprise a non-polymeric surface treatment.

6. The coating composition of claim 5 wherein the non-polymeric surface treatment has a refractive index of at least 1.50.

7. The coating composition of claim 1 wherein the inorganic nanoparticles comprise titania.

8. The coating composition of claim 1 wherein the polymeric silane surface treatment comprises repeat units comprising pendant reactive groups selected from hydroxyl groups, acid groups, or amine groups.

9. The coating composition of claim 8 wherein the coating composition comprises a crosslinker that crosslinks the pendant reactive groups.

10. The coating composition of claim 1 wherein the coating composition is substantially free of (meth)acrylate components having a molecular weight of 1,000 g/mole or less.

11. The coating composition of claim 1 wherein the coating composition is substantially solvent free.

12. The coating composition of claim 1 wherein the polymeric silane surface treatment comprises a random acrylic copolymer comprising at least 50 wt.-% of repeat units derived from one or more alkyl (meth)acrylate monomers comprising 4 to 18 carbon atoms.

13. The coating composition of claim 1 wherein the polymeric silane surface treatment has a Tg ranging from −20° C. to −80° C.

Assignees

• 3M Innovative Properties Co

Inventors

• Hao Encai
• Anim-Addo Jonathan A
• Joly Guy D
• Lamansky Sergey
• Dizio James P

Classifications

• C08L43/04

  Homopolymers or copolymers of monomers containing silicon · CPC title

• G02B1/111

  using layers comprising organic materials · CPC title

• G02B5/045

  Prism arrays · CPC title

• G02B5/0294

  adapted to provide an additional optical effect, e.g. anti-reflection or filter · CPC title

• Y10T428/31663

  As siloxane, silicone or silane · CPC title