# US 2016/0355689 A1 · Method for sparkle control and articles thereof

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- Number: US 2016/0355689 A1
- Document ID: US20160355689A1
- Status: Published application
- Kind: A1
- Application number: 15/243,144
- Filed: 2016-08-22
- Published: 2016-12-08
- Earliest claimed: 2011-11-02
- Assignees: Corning Incorporated
- Applicants: Corning Incorporated
- Inventors: Charles Warren Lander; Kelvin Nguyen; Alan Thomas Stephens, II
- Web page: https://patentgrep.com/patent/US20160355689A1

## CPC

- C09D 5/006: {Anti-reflective coatings}
- C03C 3/087: containing calcium oxide, e.g. common sheet or container glass
- C03C 3/093: containing zinc or zirconium
- C03C 15/00: Surface treatment of glass, not in the form of fibres or filaments, by etching (etching or surface-brightening compositions, in general C09K13/00)
- C09D 125/06: Polystyrene
- C09D 133/12: Homopolymers or copolymers of methyl methacrylate
- G02B 5/0221: {the surface having an irregular structure (G02B5/0226 takes precedence)}
- G02B 5/0226: {having particles on the surface}
- G02B 5/0268: {characterized by the fabrication or manufacturing method}
- G02B 5/0278: {used in transmission}
- C03C 2218/34: Masking
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

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.

## Claims

### Claim at position 1

-13. (canceled)

### Claim 14

A glass article prepared by the method comprising:
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; and
contacting the at least one surface of the article having the particulated mask and an etchant to form the anti-glare surface comprising:
at least one anti-glare surface having:
a haze of from about 0.1 to about 30;
a distinctness-of-image (DOI 20°) of from about 25 to about 85;
a surface roughness (Ra) of from about 50 to about 500 nm;
low sparkle of from about 1 to about less than or equal to 7 as measured by PPD at 0° and 90°; and
an average roughness peak-to-valley difference profile of from about 0.1 to about 10 micrometers.

### Claim 15 (depends on 14)

The glass article of claim 14 wherein the anti-glare surface comprises a distribution of topographic features having an average diameter of about 1 to about 100 micrometers.

### Claim 16 (depends on 14)

The glass article of claim 14 wherein the article is a protective cover glass for a display device.

### Claim 17 (depends on 14)

The glass article of claim 14 wherein the haze is from about 0.1 to about 30.

### Claim 18 (depends on 14)

The glass article of claim 14 wherein the haze is from about 0.1 to about 5.

### Claim 19

A slot coater comprising:
a slot die;
a source of a particle suspension; and
a polisher situated between the source of the particle suspension and the slot die, wherein the polisher continuously polishes the particle suspension during slot coating.