Antiglare coating and articles

• US 7,736,428 B2
• Filed: 09/28/2007
• Issued: 06/15/2010
• Est. Priority Date: 08/26/2004
• Status: Expired due to Fees

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Bottari, Frank J., Cairns, Darran R., Richter, Paul J.
• Primary Examiner(s): Gulakowski; Randy
• Assistant Examiner(s): LOEWE, ROBERT S
• Application Number:
  US11/863,503
• Publication Number:
  US 20080014341A1
• Time in Patent Office: 991 Days
• Field of Search: 528/34, 106/287.1, 106/287.16
• US Class Current: 106/287.1
• CPC Class Codes: C03C 17/3411 with at least two coatings of inorganic materials C03C17/36, C03C17/42 take precedence
• CPC Class Codes: C03C 2217/45 Inorganic continuous phases
• CPC Class Codes: C03C 2217/475 Inorganic materials
• CPC Class Codes: C03C 2217/478 Silica
• CPC Class Codes: C03C 2218/113 by sol-gel processes
• CPC Class Codes: G02B 5/0226 having particles on the surface
• CPC Class Codes: G02B 5/0278 used in transmission
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: Y10T 428/24355 Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
• CPC Class Codes: Y10T 428/24364 with transparent or protective coating
• CPC Class Codes: Y10T 428/2438 Coated
• CPC Class Codes: Y10T 428/24405 Polymer or resin [e.g., natural or synthetic rubber, etc.]
• CPC Class Codes: Y10T 428/25 Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
• CPC Class Codes: Y10T 428/31 Surface property or characteristic of web, sheet or block
• CPC Class Codes: Y10T 428/31663 As siloxane, silicone or silane

Abstract

The present invention relates to articles comprising an antiglare layer, coating compositions suitable for making antiglare layers, methods of making an antiglare article, and methods of making antiglare coating compositions. In some embodiments the article is a (e.g. illuminated) display article such as a touch screen. The antiglare layer comprises aggregate inorganic oxide particles in a cured inorganic polymer matrix.

Claims

1. A coating composition comprising an organosilane, colloidal silica particles having a mean particle size ranging from 0.05 micrometers to 0.15 micrometers, and flocculated silica particles ranging in size from greater than 2 micrometers to 100 micrometers.

2. The coating composition of claim 1 wherein the coating composition comprises flocculated and colloidal silica particles at a concentration of less than 10 wt-% of the coating composition.

3. The coating composition of claim 1 wherein the coating composition comprises flocculated and colloidal silica particles at a concentration of less than 5 wt-% of the coating composition.

4. The coating composition of claim 1 wherein the coating composition comprises flocculated and colloidal silica particles at a concentration of less than 2 wt-% of the coating composition.

5. The coating composition of claim 1 wherein the coating composition comprises flocculated and colloidal silica particles at a concentration of less than 1 wt-% of the coating composition.

6. The coating composition of claim 1 wherein the coating composition comprises flocculated and colloidal silica particles at a concentration of less than 0.5 wt-% of the coating composition.

7. The coating composition of claim 1 wherein the organosilane comprises silicon alkoxides.

8. The coating composition of claim 7 wherein the silicon alkoxides are selected from tetraethoxysilane, methyltriethoxysilane, and mixtures thereof.

9. The coating composition of claim 1 wherein the coating composition is an alcohol-containing coating composition.

10. The coating composition of claim 1 wherein a least a portion of the flocculated particles have a particle size greater than 10 microns.

11. The coating composition of claim 1 wherein a least a portion of the flocculated particles have a particle size greater than 20 microns.

12. A coating composition comprising an organosilane, colloidal silica particles having a mean particle size ranging from 0.05 micrometers to 0.15 micrometers, and flocculated silica particles ranging in size from greater than 2 micrometers to 100 micrometers;

wherein the coating composition has a transmission of at least 90% and is suitable for reducing glare.

13. The coating composition of claim 12 wherein a least a portion of the flocculated particles have a particle size greater than 10 microns.

14. The coating composition of claim 12 wherein a least a portion of the flocculated particles have a particle size greater than 20 microns.