Low emissivity and EMI shielding window films

• US 8,753,758 B2
• Filed: 11/08/2013
• Issued: 06/17/2014
• Est. Priority Date: 03/01/2010
• Status: Active Grant

• Current Assignee: Eastman Performance Films, LLC (Eastman Chemical Company)
• Original Assignee: CPFilms Inc. (Eastman Chemical Company)
• Inventors: Van Nutt, Charles Nicholas, Enniss, James Peyton, Li, Jaime Antonio, Port, Anthony Brian, Stegall, Jeremy B., Hubbard, Coby Lee, Phillips, Rita Maxine, Barth, Steven Allen, Pickett, Scott Evan
• Primary Examiner(s): Sample, David
• Assistant Examiner(s): COLGAN, LAUREN ROBINSON
• Application Number:
  US14/075,057
• Publication Number:
  US 20140065439A1
• Time in Patent Office: 221 Days
• Field of Search: 428/458, 428/469, 428/480, 428/500, 428/688, 428/689, 428/699, 428/701, 428/702, 428/432
• US Class Current: 428/701
• CPC Class Codes: B32B 15/04 comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to a bituminous or tarry layer B32B11/08; next to a water-setting substance layer B32B13/06; next to a glass layer B32B17/061; next to a cellulosic plastic layer B32B23/042
• CPC Class Codes: B32B 15/08 of synthetic resin
• CPC Class Codes: B32B 15/20 comprising aluminium or copper B32B15/016 and B32B15/017 take precedence
• CPC Class Codes: B32B 17/10 of synthetic resin
• CPC Class Codes: B32B 17/1022 Metallic coatings
• CPC Class Codes: B32B 2250/40 Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
• CPC Class Codes: B32B 2255/06 on metal layer
• CPC Class Codes: B32B 2255/10 on synthetic resin layer or on natural or synthetic rubber layer
• CPC Class Codes: B32B 2255/20 Inorganic coating
• CPC Class Codes: B32B 2255/205 Metallic coating
• CPC Class Codes: B32B 2255/26 Polymeric coating
• CPC Class Codes: B32B 2255/28 Multiple coating on one surface
• CPC Class Codes: B32B 2307/202 Conductive
• CPC Class Codes: B32B 2307/204 Di-electric
• CPC Class Codes: B32B 2307/206 Insulating
• CPC Class Codes: B32B 2307/212 Electromagnetic interference shielding
• CPC Class Codes: B32B 2307/412 Transparent
• CPC Class Codes: B32B 2307/416 Reflective
• CPC Class Codes: B32B 2367/00 Polyesters, e.g. PET, i.e. polyethylene terephthalate
• CPC Class Codes: B32B 2419/00 Buildings or parts thereof
• CPC Class Codes: B32B 2605/006 : Transparent parts other than made from inorganic glass, e.g. polycarbonate glazings
• CPC Class Codes: B32B 27/06 : as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to a layer of a particular substance B32B9/045; next to a bituminous or tarry layer B32B11/046; next to a water setting substance layer B32B13/12; next to a metal layer B32B15/08; next to a glass layer B32B17/10; next to a layer formed of natural mineral fibres or particles B32B19/045; next to a wood layer B32B21/08; next to a cellulosic plastic layer B32B23/08; next to a natural or synthetic rubber layer B32B25/08
• CPC Class Codes: B32B 27/08 : of synthetic resin
• CPC Class Codes: B32B 27/20 : using fillers, pigments, thixotroping agents
• CPC Class Codes: B32B 27/26 : using curing agents
• CPC Class Codes: B32B 27/28 : comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
• CPC Class Codes: B32B 27/30 : comprising vinyl (co)polymers; comprising acrylic (co)polymers
• CPC Class Codes: B32B 27/308 : comprising acrylic (co)polymers
• CPC Class Codes: B32B 27/36 : comprising polyesters
• CPC Class Codes: B32B 7/06 : permitting easy separation
• CPC Class Codes: B32B 7/12 : using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: C08J 2367/02 : Polyesters derived from dicarboxylic acids and dihydroxy compounds; C08J2367/06 takes precedence
• CPC Class Codes: C08J 2433/08 : Homopolymers or copolymers of acrylic acid esters
• CPC Class Codes: C08J 7/0423 : with at least one layer of inorganic material and at least one layer of a composition containing a polymer binder
• CPC Class Codes: C08J 7/043 : Improving the adhesiveness of the coatings per se, e.g. forming primers adhesives in the form of films or foils characterised by the primer layers between the polymer carriers and the adhesives C09J7/50
• CPC Class Codes: C08J 7/044 : Forming conductive coatings; Forming coatings having anti-static properties
• CPC Class Codes: C08J 7/046 : Forming abrasion-resistant coatings; Forming surface-hardening coatings
• CPC Class Codes: G02B 5/0808 : having a single reflecting layer G02B5/0883, G02B5/0891 take precedence
• CPC Class Codes: G02B 5/208 : for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation
• CPC Class Codes: G02B 5/26 : Reflecting filters G02B5/28 takes precedence
• CPC Class Codes: Y10T 156/10 : Methods of surface bonding and/or assembly therefor
• CPC Class Codes: Y10T 29/49826 : Assembling or joining
• CPC Class Codes: Y10T 428/12549 : Adjacent to each other
• CPC Class Codes: Y10T 428/24975 : No layer or component greater than 5 mils thick
• CPC Class Codes: Y10T 428/265 : 1 mil or less
• CPC Class Codes: Y10T 428/31663 : As siloxane, silicone or silane
• CPC Class Codes: Y10T 428/31678 : Of metal
• CPC Class Codes: Y10T 428/31681 : Next to polyester, polyamide or polyimide [e.g., alkyd, glue, or nylon, etc.]
• CPC Class Codes: Y10T 428/31699 : Ester, halide or nitrile of addition polymer
• CPC Class Codes: Y10T 428/31786 : Of polyester [e.g., alkyd, etc.]
• CPC Class Codes: Y10T 428/31855 : Of addition polymer from unsaturated monomers

Abstract

A low emissivity and EMI shielding transparent composite film typically for use in association with window glazing and comprising a transparent film substrate having on one side thereof an underlayer of abrasion resistant hardcoat material with at least one infrared reflective layer covering the underlayer, typically a metallic layer which may be encased in metal oxide layers, which is then covered with a thin external protective top coat of a cured fluorinated resin.

Claims

1. A low emissivity transparent composite film comprising:

a transparent polyester film substrate;

an underlayer of abrasion resistant hardcoat material deposited on the surface of the film substrate and comprising a crosslinked acrylate polymer, the underlayer having a dried thickness of about 2 to about 6 microns;

at least one infrared reflective layer comprising at least one core metallic layer and at least one spacer layer comprising one or more metal oxides;

a transparent, protective top coat comprising a polysilazane, fluoro silane, fluoroalkyl silane, or combination thereof and having a thickness of less than 0.5 microns;

wherein the composite film has an emissivity of less than about 0.2 and an abrasion delta haze of 5 percent or less.

2. The composite film of claim 1 wherein the core metallic layer comprises aluminum, copper, gold, nickel, silver, platinum, palladium, tungsten, titanium, or alloys thereof.

3. The composite film of claim 1, wherein the underlayer has an abrasion delta haze of about 3 to about 5 percent.

4. The composite film of claim 1 wherein the infrared reflective layer further comprises at least one thin metal film having a thickness of about 1 to about 5 nm.

5. The composite film of claim 4 wherein the thin metal film comprises nickel, chromium, nobium, platinum, cobalt, zinc, molybdenum, zirconium, vanadium, or alloys thereof.

6. The composite film of claim 5 wherein the thin metal film comprises a nickel-chromium alloy.

7. The composite film of claim 1 wherein the infrared reflective layer further comprises a silicon-based layer comprising silicon nitride, silicon dioxide, silicon oxide, or combinations thereof.

8. The composite film of claim 1 wherein the spacer layer comprises a transparent conductive layer, a dielectric layer, or a combination thereof.

9. The composite film of claim 1 wherein the spacer layer comprises indium oxide, indium zinc oxide, indium tin oxide, aluminum oxide, silicon nitride, silicon dioxide, antimony tin oxide, tin oxide, or mixtures thereof.

10. The composite film of claim 1 wherein the infrared reflective layer comprises a plurality of thin spacer layers disposed between a plurality of transparent conductive layers.

11. A low emissivity transparent composite film comprising:

a transparent film substrate comprising poly(ethylene)terephthalate;

an underlayer of abrasion resistant hardcoat material deposited on the surface of the film substrate and comprising a crosslinked acrylate polymer, the underlayer having a dried thickness of about 2 to about 6 microns;

at least one infrared reflective layer comprising at least one core metallic layer, at least one spacer layer comprising indium oxide, indium zinc oxide, indium tin oxide, or mixtures thereof; and

a transparent, protective top coat comprising a polysilazane, fluoro silane, fluoroalkyl silane, or combination thereof and having a thickness of less than 0.5 microns;

wherein the composite film has an emissivity of less than about 0.17 and an abrasion delta haze of 5% or less.

12. The composite film of claim 11 which has an emissivity of less than about 0.1.

13. The composite film of claim 11 which has a visible light transmission of up to about 75 percent.

14. The composite film of claim 11 wherein the core metallic layer comprises aluminum, copper, gold, nickel, silver, platinum, palladium, tungsten, titanium, or alloys thereof.

15. The composite film of claim 11 wherein the infrared reflective layer further comprises a thin metal film comprising nickel, chromium, nobium, platinum, cobalt, zinc, molybdenum, zirconium, vanadium, or alloys thereof.

16. The composite film of claim 15 wherein the thin metal film comprises a nickel-chromium alloy.

17. The composite film of claim 11 which has a visible light transmission of about 28 percent to about 47 percent.

18. A low emissivity transparent composite film comprising:

a transparent film substrate comprising poly(ethylene)terephthalate;

an underlayer of abrasion resistant hardcoat material deposited on the surface of the film substrate and comprising a crosslinked acrylate polymer, the underlayer having a dried thickness of about 2 to about 6 microns;

at least one infrared reflective layer comprising at least one core metallic layer comprising aluminum, gold, nickel, silver, or alloys thereof, and at least one spacer layer comprising indium oxide, indium zinc oxide, indium tin oxide, or combinations thereof; and

a transparent, protective top coat comprising a polysilazane, fluoro silane, fluoroalkyl silane, or combination thereof and having a thickness of less than 0.5 microns;

wherein the composite film has an emissivity of less than about 0.15 and an abrasion delta haze of 5 percent or less.

19. The composite film of claim 18 wherein the infrared reflective further comprises a thin metal film protective layer comprising nickel, chromium, nobium, platinum, cobalt, zinc, molybdenum, zirconium, vanadium, or alloys thereof.

20. The composite film of claim 18 wherein the infrared reflective layer further comprises a silicon-based layer comprising silicon nitride, silicon dioxide, silicon oxide, or combinations thereof.