Porous metallized sheets coated with an inorganic layer having low emissivity and high moisture vapor permeability
AssigneeE. I. Du Pont de Nemours and Company
InventorsMichel Nutz, Aloyse Nicolas Wilmes
Life of this patent
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Abstract
A metallized composite sheet having low emissivity formed by coating a metallized moisture vapor permeable sheet with at least one outer inorganic coating layer, wherein the moisture vapor permeability of the composite sheet is at least about 80% of the moisture vapor permeability of the starting sheet.
Claims24
A moisture vapor permeable flexible multilayer composite, comprising a moisture vapor permeable sheet and a metal layer selected from the group consisting of aluminum, silver, copper, gold, tin, zinc, and their alloys adjacent a first outer surface of the moisture vapor permeable sheet and an outer coating layer of inorganic material selected from the group consisting of silicon oxides, titanium oxides, zirconium oxides, magnesium oxides, metal nitrides, and metal carbides deposited on the metal layer and wherein the metal layer has a percentage of retained optical density after steam exposure greater than about 25%.
A metallized composite sheet, comprising:
- a porous flash spun plexifilamentary sheet layer having first and second outer surfaces and at least one multi-layer coating comprising:
- a metal coating layer having a thickness between about 15 nanometers and about 200 nanometers deposited on the first outer surface of the flash spun plexifilamentary sheet layer, said metal selected from the group consisting of aluminum, silver, copper, gold, tin, zinc, and their alloys;
- and an outer inorganic coating layer of silicon oxide having a thickness between about 25 nanometers and about 500 nanometers deposited on the metal layer;
- wherein the emissivity of the coated sheet is less than about 0.2 and the MVTR of the coated sheet is at least about 80% of that of the uncoated sheet.
Dependencies are inferred from the claim text.