Low sparkle matte coats and methods of making

Patent metadata

Field	Value
Publication number	US-10845509-B2
Application number	US-202016911483-A
Country	US
Kind code	B2
Filing date	Jun 25, 2020
Priority date	Sep 15, 2015
Publication date	Nov 24, 2020
Grant date	Nov 24, 2020

Abstract

A matte coat having a first major surface, the matte coat comprising a first layer defining the first major face of the matte coat and comprising a polymeric matrix and a plurality of forming bodies entrained therein, wherein index of refraction of the forming bodies is similar to that of the polymeric matrix and the first major surface has a plurality of protuberances corresponding to forming bodies entrained within. Also, optical assemblies comprising such matte coats and methods for making such matte coats.

First claim

What is claimed is:

1. A method for making a low sparkle matte coat comprising the steps of:
preparing a forming composition comprising a film-forming curable mixture and a plurality of forming bodies, wherein the film-forming curable mixture has a viscosity of at least about 75 cps and density of at least about 0.95 and the forming bodies have a density of at least about 1.1, an index of refraction (n b ), and an average major dimension;
depositing the forming composition into a coating having a major surface; then
curing the curable mixture of the coating such that the curable mixture polymerizes and shrinks to yield a polymeric matrix having a plurality of protuberances on the major surface thereof corresponding to forming bodies entrained within the polymeric matrix.

2. The method of claim 1 wherein the forming composition has a viscosity of from about 75 to about 3,000 cps when deposited into coating form.

3. The method of claim 1 wherein the forming composition has a density of about 0.95 or more when deposited into coating form.

4. The method of claim 1 wherein the forming bodies have an index of refraction (n b ) of from about 1.35 to about 2.2.

5. The method of claim 1 wherein the film-forming curable mixture comprises one or more reactive polymers selected from the group consisting of thermosetting and thermoplastic polymers.

6. The method of claim 1 wherein the film-forming curable mixture comprises at least one of cellulose acetate butyrate and ethoxylated trimethylolpropane triacrylate.

7. The method of claim 1 wherein the film-forming curable mixture further comprises nanoparticles.

8. The method of claim 1 wherein the first layer has a thickness of about 10 microns or less.

9. The method of claim 1 wherein the thickness of the film-like deposit is about 1.5 times the average major dimension of the forming bodies.

10. The method of claim 1 wherein the average major dimension of the forming bodies is from about 0.8 to about 10 microns.

Assignees

• 3M Innovative Properties Co

Inventors

• Ludemann Thomas J
• Ask David T

Classifications

• G02B6/0051

  Diffusing sheet or layer · CPC title

• G02B5/0226

  having particles on the surface · CPC title

• G02B5/0242 Primary

  by means of dispersed particles · CPC title

• G02B1/111

  using layers comprising organic materials · CPC title