Oxygen barrier composite film structure
First Claim
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1. A composite film structure containing a plurality of separate layers comprising:
- (a) a first inorganic layer having a thickness not greater than 600 angstroms and having an oxygen transmission rate (OTR) not greater than 0.8 cubic centimeters/square meter-day-atmosphere;
(b) a second inorganic layer having a thickness not greater than 600 angstroms and having an oxygen transmission rate (OTR) not greater than 0.8 cubic centimeters/square meter-day-atmosphere; and
(c) a polymeric barrier layer having an oxygen permeability coefficient (OPV) not greater than 1.5 cubic centimeters-25 microns/square meter-day-atmospherewherein the polymeric barrier layer (c) is in contact or in substantial contact with at least one of the first (a) and second (b) inorganic layers, wherein the first (a) and second (b) inorganic layers are separated from one another by an intermediate adhesive layer and wherein the oxygen transmission rate (OTR) of the composite film structure is not greater than 0.012 cubic centimeters/square meter-day-atmosphere and the oxygen transmission rate (OTR) and oxygen permeability coefficient (OPV) are measured in accordance with ASTM D3985-81 at a temperature of 23°
C., 50% relative humidity and using 100% oxygen on one side of the film at 760 mm Hg (1 atmosphere) and 100% nitrogen on the other side of the film at 760 mm Hg (1 atmosphere).
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Abstract
A composite film structure containing two inorganic layers each being not greater than 600 angstroms in thickness and having an oxygen transmission rate (OTR) not greater than 0.8 cubic centimeters/square meter-day-atmosphere with one of the layers in contact or in substantial contact with a polymeric barrier layer having an oxygen permeability coefficient (OPV) not greater than 1.5 cubic centimeters-25 microns/square meter-day-atm. The composite film structure has an oxygen transmission rate (OTR) of not greater than 0.012 cubic centimeters/square meter-day-atm and can be used in vacuum panel insulation structures.
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Citations
17 Claims
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1. A composite film structure containing a plurality of separate layers comprising:
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(a) a first inorganic layer having a thickness not greater than 600 angstroms and having an oxygen transmission rate (OTR) not greater than 0.8 cubic centimeters/square meter-day-atmosphere; (b) a second inorganic layer having a thickness not greater than 600 angstroms and having an oxygen transmission rate (OTR) not greater than 0.8 cubic centimeters/square meter-day-atmosphere; and (c) a polymeric barrier layer having an oxygen permeability coefficient (OPV) not greater than 1.5 cubic centimeters-25 microns/square meter-day-atmosphere wherein the polymeric barrier layer (c) is in contact or in substantial contact with at least one of the first (a) and second (b) inorganic layers, wherein the first (a) and second (b) inorganic layers are separated from one another by an intermediate adhesive layer and wherein the oxygen transmission rate (OTR) of the composite film structure is not greater than 0.012 cubic centimeters/square meter-day-atmosphere and the oxygen transmission rate (OTR) and oxygen permeability coefficient (OPV) are measured in accordance with ASTM D3985-81 at a temperature of 23°
C., 50% relative humidity and using 100% oxygen on one side of the film at 760 mm Hg (1 atmosphere) and 100% nitrogen on the other side of the film at 760 mm Hg (1 atmosphere). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification