Insulating glass unit with crack-resistant low-emissivity suspended film
First Claim
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1. An insulating glass unit, comprising:
- a pair of glass panes in a parallel, spaced apart relation; and
at least one transparent, heat-shrunk, tensioned polymer sheet in a spaced apart parallel relation between the glass panes, at least one surface of at least one polymer sheet having a substantially transparent coating comprising a composite multilayer stack of dielectric and metallic layers, the stack comprising an amorphous indium oxide dielectric layer about 20 to about 80 nm thick in contact with the polymer sheet, a crystalline zinc oxide seed layer about 5 to about 15 nm thick deposited on the amorphous indium oxide dielectric layer, at least one low-emissivity silver layer grown upon the zinc oxide seed layer, and an indium oxide protective layer.
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Abstract
A low-e insulating glass unit has a suspended, coated IR reflecting polymer sheet under tension, e.g. from heat shrinkage. The polymer sheet is coated with a multilayer stack of dielectric and metallic layers, including at least one silver layer deposited upon a zinc oxide seed layer that is at most 15 nm thickness. The use of zinc oxide ensures good seeding for high quality silver layer growth, thereby providing low emissivity. The thinness of the zinc oxide ensures that it resists cracking when the polymer sheet is tensioned.
33 Citations
14 Claims
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1. An insulating glass unit, comprising:
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a pair of glass panes in a parallel, spaced apart relation; and at least one transparent, heat-shrunk, tensioned polymer sheet in a spaced apart parallel relation between the glass panes, at least one surface of at least one polymer sheet having a substantially transparent coating comprising a composite multilayer stack of dielectric and metallic layers, the stack comprising an amorphous indium oxide dielectric layer about 20 to about 80 nm thick in contact with the polymer sheet, a crystalline zinc oxide seed layer about 5 to about 15 nm thick deposited on the amorphous indium oxide dielectric layer, at least one low-emissivity silver layer grown upon the zinc oxide seed layer, and an indium oxide protective layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A process for the preparation of a insulating glass unit, comprising:
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(i). coating a polymer sheet with a series of layers, the layers comprising an amorphous indium oxide layer having a thickness of about 20 to about 80 nanometers on the surface of the polymer sheet;
a crystalline, zinc-based oxide seed layer having a thickness about 5 to about 10 nanometers on the surface on the amorphous indium oxide layer; and
a silver layer having a thickness of about 5 to about 60 nanometers on the surface of the zinc-based oxide seed layer to produce a coated, polymer sheet transparent to visible light;(iI). bonding the coated, polymer sheet to two or more spacers between a pair of glass panes to produce an assembled glass unit having the coated, polymer sheet suspended in a spaced apart and parallel relation to the pair of glass panes; and (iii). heat shrinking the coated polymer sheet. - View Dependent Claims (12, 13, 14)
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Specification