# US 8,784,985 B2 · Anti-reflective coatings for optically transparent substrates

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- Number: US 8,784,985 B2
- Document ID: US8784985B2
- Status: Granted
- Kind: B2
- Application number: 14/023,616
- Filed: 2013-09-11
- Published: 2014-01-09
- Granted: 2014-07-22
- Earliest claimed: 2009-06-10
- Assignees: Honeywell International Inc.
- Applicants: Honeywell International Inc.
- Inventors: Sudip Mukhopadhyay; Yamini Pandey; Lea Dankers
- Web page: https://patentgrep.com/patent/US8784985B2

## CPC

- H10F 77/315: {the coatings being antireflective or having enhancing optical properties}
- C03C 17/30: with silicon-containing compounds
- C09D 5/00: Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced {(electrically insulating plastics, resins or waxes H01B3/30)}; Filling pastes
- G02B 1/111: using layers comprising organic materials
- H10F 19/00: Integrated devices, or assemblies of multiple devices, comprising at least one photovoltaic cell covered by group H10F10/00, e.g. photovoltaic modules
- H10F 77/306: {for devices having potential barriers}
- C03C 2217/732: made of a single layer
- Y02E 10/50: Photovoltaic [PV] energy
- Y02E 10/52: PV systems with concentrators
- Y10T 428/254: Polymeric or resinous material
- Y10T 428/31504: Composite [nonstructural laminate]
- Y10T 428/31663: As siloxane, silicone or silane
- H10F: INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
- 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
- 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)
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Anti-reflective coatings and coating solutions, optically transparent elements and improved processes for preparing AR coatings and coating solutions are described. The anti-reflective coatings are formed from at least two different alkoxy silane materials in a base catalyzed reaction.

## Claims

### Claim 1

An optically transparent element comprising:
an optically transparent substrate; and
an anti-reflective coating disposed on at least one surface of the optically transparent substrate, the anti-reflective coating comprising a polymer having an average particle size of between 1 nm and 100 nm, the polymer consisting essentially of tetraethoxy silane residues and methyltriethoxy silane residues;
the polymer comprising at least 50 mole percent of the tetraalkoxy silane residues based on the total moles of polymer;
the polymer comprising between 35 and 50 mole percent of the methyltriethoxy silane residues based on the total moles of polymer; and
the anti-reflective coating having a refractive index of less than 1.28.

### Claim 2 (depends on 1)

The optically transparent element of claim 1, wherein the coating comprises polymer particles having an average size between 25 nm and 75 nm.

### Claim 3 (depends on 1)

The optically transparent element of claim 1, wherein the anti-reflective coating has a refractive index of between 1.15 and 1.25.

### Claim 4 (depends on 1)

The optically transparent element of claim 1, wherein the coating has a pencil hardness of at least 2H.

### Claim 5 (depends on 1)

The optically transparent element of claim 1, wherein said substrate is glass.

### Claim 6 (depends on 1)

The optically transparent element of claim 1, wherein said coating has a contact angle of less than 10.

### Claim 7 (depends on 1)

The optically transparent element of claim 1, wherein said polymer is a polycondensate resulting from hydrolysis and polycondensation of tetraethoxy silane and methyltriethoxy silane.

### Claim 8 (depends on 1)

The optically transparent element of claim 1, wherein said anti-reflective coating has a refractive index of 1.16 or greater and less than 1.28, and a pencil hardness of at least 2H.

### Claim 9

An optically transparent element comprising:
an optically transparent glass substrate; and
a silica-based anti-reflective coating disposed on at least one surface of the optically transparent substrate, the anti-reflective coating comprising a polymer derived from at least two different alkoxysilane precursors and including at least one first tetraalkoxy silane residue, and at least one second alkoxy silane residue selected from the group consisting of trialkoxy silanes, dialkoxy silanes, monoalkoxy silanes, and combinations thereof, the polymer comprising between 35 and 50 mole percent of the at least one second alkoxy silane residue based on the total moles of polymer and having a refractive index of 1.3 or less and a pencil hardness of at least 2H.

### Claim 10 (depends on 9)

The optically transparent element of claim 9, wherein the anti-reflective coating has a refractive index of between 1.15 and 1.25.

### Claim 11 (depends on 9)

The optically transparent element of claim 9, wherein the at least one first tetraalkoxy silane residue comprises tetraethoxy silane and the at least one second alkoxy silane comprises methyltriethoxy silane.

### Claim 12 (depends on 9)

The optically transparent element of claim 9, wherein the coating comprises polymer particles having an average size between 1 nm and 100 nm.

### Claim 13 (depends on 9)

The optically transparent element of claim 9, wherein the at least one second alkoxy silane residue is selected from the group consisting of trialkoxy silanes, monoalkoxy silanes, and combinations thereof.

### Claim 14 (depends on 9)

The optically transparent element of claim 9, wherein said coating has a contact angle of less than 10.

### Claim 15 (depends on 9)

The optically transparent element of claim 9, wherein said polymer is a polycondensate resulting from hydrolysis and polycondensation of tetraethoxy silane and the at least one second alkoxy silane selected from the group consisting of trialkoxy silanes, dialkoxy silanes, monoalkoxy silanes, and combinations thereof.

### Claim 16 (depends on 9)

The optically transparent element of claim 9, wherein said anti-reflective coating has a refractive index of 1.16 or greater and less than 1.28.

### Claim 17 (depends on 9)

The optically transparent element of claim 9, wherein the coating comprises polymer particles having an average size between 25 nm and 75 nm.