Coated substrate with high reflectance
AssigneeAgc Glass Europe
InventorsEric Tixhon, Philippe Legrand
Life of this patent
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Abstract
A transparent coated substrate with high reflectance, especially for use as in exterior glazing panels for buildings, is provided by a substrate carrying a coating stack comprising a pyrolytically-formed main layer containing oxides of tin and antimony, in which the main layer has a geometric thickness of at least 250 nm and the stack includes an outer reflective layer having a geometric thickness in the range 30 to 150 nm and a refractive index in the range 2.0 to 2.8, whereby the so-coated substrate has a reflectance (RL) of more than 10%.
Claims40
A coated transparent substrate, comprising, in order from the substrate:
- an undercoat layer;
- a pyrolytically-formed main coating layer which comprises oxide of tin;
- and
- an outer reflective layer which has a refractive index ranging from 2.0 to 2.8, so that the coated transparent substrate has a luminous reflectance (RL) of more than 10%.
A transparent substrate carrying a coating stack, the coating stack comprising, in order from the substrate:
- an undercoat layer imparting to the coated transparent substrate a more neutral tint in reflection,
- a pyrolytically-formed main coating layer comprising oxide of tin, and
- an outer reflective layer having a geometric thickness ranging from 30 to 150 nm and
- a refractive index ranging from 2.0 to 2.8, so that the coated transparent substrate has a luminous reflectance (RL) of more than 10%.
A transparent substrate carrying a coating stack, the coating stack comprising, in order from the substrate:
- an undercoat layer,
- a pyrolytically-formed main coating layer comprising oxide of tin, and
- an outer reflective layer having a geometric thickness ranging from 30 to 150 nm and
- a refractive index ranging from 2.0 to 2.8, so that the coated transparent substrate has a luminous reflectance (RL) of more than 10%, has a colour in reflection defined by a Hunter value a between 0 and −3.7 and a Hunter value b between −5.3 and −2 and has a purity in reflection not greater than 10.7%.
Dependencies are inferred from the claim text.