Method for sparkle control and articles thereof
A glass article including: at least one anti-glare surface having haze, distinctness-of-image, surface roughness, uniformity properties and sparkle properties, as defined herein. A method of making the glass article includes, for example, slot coating a suspension of particles on at least one surface of the article to provide a particulated mask covering from about 40 to 92% of the coated surface area; contacting the at least one surface of the article having the particulated mask and an etchant to form the anti-glare surface, and optionally continuously polishing the suspension of particles just prior to slot coating. A display system that incorporates the glass article, as defined herein, is also disclosed.
1. A method of making an article having an anti-glare surface, comprising:
continuously polishing a liquid suspension of particles;
slot coating the continuously polished liquid suspension of particles on at least one surface of the article to provide a particulated mask covering from about 40 to 92% of the coated surface area;
contacting the at least one surface of the article having the particulated mask and an etchant to form the anti-glare surface, wherein the particulated mask is free of density bands, and the anti-glare surface of the article has low sparkle of from about 1 to about less than or equal to 7 as measured by PPD at 00 and 900, and wherein polishing the suspension of particles is accomplished continuously and just before a slot die in an in-line polisher.
2. The method of claim 1 wherein the at least one surface of the article comprises a glass, the particulated mask comprises a polymer, a wax, or mixture thereof, and the etchant comprises at least one acid.
3. The method of claim 2 wherein the surface glass is independently comprised of at least one of a soda lime silicate glass, an alkaline earth aluminosilicate glass, an alkali aluminosilicate glass, an alkali borosilicate glass, a boroaluminosilicate glass, or a combination thereof, and the etchant comprises at least one acid selected from HF, H 2 SO 4 , HNO 3 , HCl, CH 3 CO 2 H, H 3 PO 4 , or a combination thereof.
4. The method of claim 1 wherein contacting the surface and an etchant comprises exposing the surface having the particulated mask to the etchant for about 1 second to about 30 minutes.
5. The method of claim 1 wherein the particulated mask has particles having a D 50 diameter of from about 1 to about 30 micrometers.
6. The method of claim 1 further comprising washing the resulting anti-glare surface, chemically strengthening the anti-glare surface, or a combination thereof.
7. The method of claim 1 further comprising, prior to etching, contacting at least another surface of the article with an optionally removable, etch-resistant protective layer.
8. The method of claim 1 wherein the suspension of particles comprises at least one of: a glass, a ceramic, a metal, a salt, a clay, a polymer, a copolymer, nano-particles, cross-linked polymer particles, UV cured particles, a composite, wax, or a combination thereof.
9. The method of claim 1 wherein the protective particle mask is less than or equal to a monolayer.
10. The method of claim 1 wherein the suspension of particles further includes an anionic surfactant.
11. The method of claim 1 wherein polishing the suspension of particles is accomplished continuously during slot coating.
12. A method of creating an anti-glare glass surface, comprising:
continuously polishing a liquid suspension of particles;
contacting a glass surface with the continuously polished liquid suspension of particles from a slot coater to deposit a protective particle mask having surface area coverage of about 60 to 92% of the contacted area;
contacting the resulting particulated glass surface and an etchant to form the anti-glare surface; and
wherein polishing the suspension of particles is accomplished continuously and just before a slot die in an in-line polisher.