REFLECTION-RESISTANT GLASS ARTICLES AND METHODS FOR MAKING AND USING SAME

• US 20130183489A1
• Filed: 01/08/2013
• Published: 07/18/2013
• Est. Priority Date: 01/13/2012
• Status: Abandoned Application

• Current Assignee: Corning Incorporated
• Original Assignee: Corning Incorporated
• Inventors: Dawes, Steven Bruce, Hart, Shandon Dee, Cremer, Melissa Danielle, Hogue, Lisa Ann
• Application Number:
  US13/736,275
• Publication Number:
  US 20130183489A1
• Time in Patent Office: Days
• US Class Current: 428/141
• CPC Class Codes: B05D 5/063 Reflective effect B05D5/067 takes precedence
• CPC Class Codes: B32B 3/30 characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs apertured layer B32B3/266; layer with cavities or internal voids B32B3/26
• CPC Class Codes: B32B 5/00 Layered products characterised by the non- homogeneity or physical structure , i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
• CPC Class Codes: C03C 17/3417 all coatings being oxide coatings
• CPC Class Codes: C03C 2217/734 comprising an alternation of high and low refractive indexes
• CPC Class Codes: C03C 2218/113 by sol-gel processes
• CPC Class Codes: C03C 2218/116 by spin-coating, centrifugation
• CPC Class Codes: C03C 3/083 containing aluminium oxide or an iron compound
• CPC Class Codes: C03C 3/091 containing aluminium
• CPC Class Codes: G02B 1/115 Multilayers
• CPC Class Codes: Y10T 428/24355 Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
• CPC Class Codes: Y10T 428/24975 No layer or component greater than 5 mils thick
• CPC Class Codes: Y10T 428/265 1 mil or less

Abstract

Described herein are coated glass or glass-ceramic articles having improved reflection resistance. Further described are methods of making and using the improved articles. The coated articles generally include a glass or glass-ceramic substrate and a multilayer coating disposed thereon. The multilayer coating is not a free-standing adhesive film, but a coating that is formed on or over the glass or glass-ceramic substrate.

Claims

1. A coated article, comprising:

a glass or glass-ceramic substrate; and

a multilayer coating having an average thickness of less than or equal to about 1 micrometer disposed on at least a portion of a surface of the glass or glass-ceramic substrate;

wherein the multilayer coating comprises a layer of a low-refractive-index material, having an index of refraction as measured at a wavelength of 589 nanometers of less than 1.6, and a layer of a high-refractive-index material, having an having an index of refraction as measured at a wavelength of 589 nanometers of greater than or equal to 1.6;

wherein the layer of the low-refractive-index material is farthest from the glass or glass-ceramic substrate;

wherein the coated article has a specular reflectance that is less than or equal to about 85 percent of a specular reflectance of the glass or glass-ceramic substrate alone when measured at wavelengths of about 450 nanometers to about 750 nanometers;

wherein the multilayer coating has a specular reflectance of less than 5 percent across the spectrum comprising wavelengths of about 450 nanometers to about 750 nanometers.

2. The coated article of claim 1, further comprising an intermediate layer interposed between the glass or glass-ceramic substrate and the multilayer coating.

3. The coated article of claim 1, wherein the intermediate layer comprises a glare-resistant coating, a color-providing composition, an opacity-providing composition, or an adhesion or compatibility promoting composition.

4. The coated article of claim 1, wherein the glass or glass-ceramic substrate comprises a silicate glass, borosilicate glass, aluminosilicate glass, or boroaluminosilicate glass, which optionally comprises an alkali or alkaline earth modifier.

5. The coated article of claim 1, wherein the glass or glass-ceramic substrate is a glass-ceramic comprising a glassy phase and a ceramic phase, wherein the ceramic phase comprises β

-spodumene, β

-quartz, nepheline, kalsilite, or carnegieite.

6. The coated article of claim 1, wherein the glass or glass-ceramic substrate has an average thickness of less than or equal to about 2 millimeters.

7. The coated article of claim 1, wherein at least one layer of the multilayer coating comprises nanoscale pores.

8. The coated article of claim 1, wherein the coated article comprises a portion of a touch-sensitive display screen or cover plate for an electronic device, a non-touch-sensitive component of an electronic device, a surface of a household appliance, or a surface of a vehicle component.

9. A coated article, comprising:

a chemically-strengthened alkali aluminosilicate glass substrate; and

a multilayer coating having an average thickness of less than or equal to about 100 nanometers disposed directly on at least a portion of a surface of the chemically-strengthened alkali aluminosilicate glass substrate;

wherein the multilayer coating comprises a layer of a low-refractive-index material, having an index of refraction as measured at a wavelength of 589 nanometers of less than 1.6, and a layer of a high-refractive-index material, having an having an index of refraction as measured at a wavelength of 589 nanometers of greater than or equal to 1.6;

wherein the layer of the low-refractive-index material is farthest from the chemically-strengthened alkali aluminosilicate glass substrate;

wherein the chemically-strengthened alkali aluminosilicate glass substrate has a compressive layer having a depth of layer greater than or equal to 20 micrometers exhibiting a compressive strength of at least 400 megaPascals both before and after the multilayer coating has been disposed thereon;

wherein the coated article has a specular reflectance of less than 7 percent across the spectrum comprising wavelengths of about 450 nanometers to about 750 nanometers;

wherein the coated article has an optical transmission of at least about 94 percent;

wherein the coated article has a haze of less than or equal to about 0.1 percent when measured in accordance with ASTM procedure D1003;

wherein the coated article exhibits a scratch resistance of at least 6H when measured in accordance with ASTM test procedure D3363-05.

10. The coated article of claim 9, wherein the specular reflectance of the coated article varies by less than about 5 percent after 100 wipes using a Crockmeter, and varies by less than about 10 percent after 5000 wipes using the Crockmeter from an initial measurement of the specular reflectance of the coated article before a first wipe using the Crockmeter.

11. The coated article of claim 9, wherein at least one layer of the multilayer coating comprises nanoscale pores.

12. The coated article of claim 9, wherein the low-refractive-index material is SiO₂, and the high-refractive-index material is TiO₂.

13. A method of making a coated article, the method comprising:

providing a glass or glass-ceramic substrate;

preparing a first solution comprising a high-refractive-index material or a precursor to the high-refractive-index material, wherein the high-refractive-index material has an index of refraction as measured at a wavelength of 589 nanometers of greater than or equal to 1.6, and wherein the first solution comprises no colloidal particles or aggregates having a longest cross-sectional dimension greater than about 75 nanometers;

preparing a second solution comprising a low-refractive-index material or a precursor to the low-refractive-index material, wherein the low-refractive-index material has an index of refraction as measured at a wavelength of 589 nanometers of less than 1.6, and wherein the second solution comprises no colloidal particles or aggregates having a longest cross-sectional dimension greater than about 75 nanometers;

disposing the first solution on a surface of the glass or glass-ceramic substrate;

heating the substrate with the first solution disposed thereon at a temperature of less than or equal to about 320 degrees Celsius to form a first layer comprising the high-refractive-index material on the surface of the glass or glass-ceramic substrate;

disposing the second solution on the first layer of the high-refractive-index material; and

heating the substrate with the second solution disposed thereon at a temperature of less than or equal to about 320 degrees Celsius to form a second layer comprising the low-refractive-index material on the first layer.

14. The method of claim 13, further comprising forming an intermediate layer on at least a portion of the surface of the glass or glass-ceramic substrate prior to disposing the first solution thereon, wherein the intermediate layer comprises glare-resistant coating, a color-providing composition, an opacity-providing composition, or an adhesion or compatibility promoting composition.

15. The method of claim 13, wherein at least one of the first or second layers comprises nanoscale pores.

16. The method of claim 13, further comprising preparing a third solution comprising a high-refractive-index material or a precursor to the high-refractive-index material, wherein the high-refractive-index material has an index of refraction as measured at a wavelength of 589 nanometers of greater than or equal to 1.6, and wherein the third solution comprises no colloidal particles or aggregates having a longest cross-sectional dimension greater than about 75 nanometers;

preparing a fourth solution comprising a low-refractive-index material or a precursor to the low-refractive-index material, wherein the low-refractive-index material has an index of refraction as measured at a wavelength of 589 nanometers of less than 1.6, and wherein the fourth solution comprises no colloidal particles or aggregates having a longest cross-sectional dimension greater than about 75 nanometers;

disposing the third solution on the second layer;

heating the substrate with the third solution disposed thereon at a temperature of less than or equal to about 320 degrees Celsius to form a third layer comprising the high-refractive-index material on the second layer;

disposing the fourth solution on the third layer of the high-refractive-index material; and

heating the substrate with the fourth solution disposed thereon at a temperature of less than or equal to about 320 degrees Celsius to form a fourth layer comprising the low-refractive-index material on the third layer.

17. The method of claim 16, wherein the low-refractive-index material or the precursor to the low-refractive-index material of the second solution is the same as the low-refractive-index material or the precursor to the low-refractive-index material of the fourth solution.

18. The method of claim 16, wherein the high-refractive-index material or the precursor to the high-refractive-index material of the first solution is the same as the high-refractive-index material or the precursor to the high-refractive-index material of the third solution.

19. The method of claim 13, wherein the coated article has a specular reflectance that is less than or equal to about 85 percent of a specular reflectance of the glass or glass-ceramic substrate alone when measured at wavelengths of about 450 nanometers to about 750 nanometers.

20. The method of claim 13, wherein the coated article has a specular reflectance of less than 7 percent across the spectrum comprising wavelengths of about 450 nanometers to about 750 nanometers.