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US 8,784,985 B2Granted
Anti-reflective coatings for optically transparent substrates
AssigneeHoneywell International Inc.
InventorsSudip Mukhopadhyay, Yamini Pandey, Lea Dankers
Life of this patent
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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.
Claims17
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.
4 more elements
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.
Dependencies are inferred from the claim text.