Polymer sheets and multiple layer glass panels having adjustable tint

• US 7,179,535 B2
• Filed: 12/17/2003
• Issued: 02/20/2007
• Est. Priority Date: 12/17/2003
• Status: Active Grant

• Current Assignee: Solutia Incorporated (Eastman Chemical Company)
• Original Assignee: Solutia Incorporated (Eastman Chemical Company)
• Inventors: Fisher, William Keith
• Primary Examiner(s): NAKARANI, DHIRAJLAL S
• Application Number:
  US10/736,695
• Publication Number:
  US 20050136243A1
• Time in Patent Office: 1,161 Days
• Field of Search: 428/437, 252/583, 359/252, 359/253, 359/254
• US Class Current: 428/437
• CPC Class Codes: B32B 17/10005 laminated safety glass or glazing
• CPC Class Codes: B32B 17/10036 comprising two outer glass sheets
• CPC Class Codes: B32B 17/10174 Coatings of a metallic or dielectric material on a constituent layer of glass or polymer
• CPC Class Codes: B32B 17/10495 optoelectronic, i.e. optical valve
• CPC Class Codes: B32B 17/10688 Adjustment of the adherence to the glass layers
• CPC Class Codes: B32B 17/10761 containing vinyl acetal
• CPC Class Codes: B32B 2367/00 Polyesters, e.g. PET, i.e. polyethylene terephthalate
• CPC Class Codes: E06B 2009/2464 featuring transparency control by applying voltage, e.g. LCD, electrochromic panels
• CPC Class Codes: E06B 9/24 Screens or other constructions affording protection against light, especially against sunshine; Similar screens for privacy or appearance; Slat blindsoperating, guiding or securing devices or arrangements for roll-type closures E06B9/56; free-hanging flexible screens A47H23/00
• CPC Class Codes: G02F 1/167 by electrophoresis
• CPC Class Codes: G02F 1/16757 Microcapsules
• CPC Class Codes: Y10T 428/25 Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
• CPC Class Codes: Y10T 428/254 Polymeric or resinous material
• CPC Class Codes: Y10T 428/256 Heavy metal or aluminum or compound thereof
• CPC Class Codes: Y10T 428/258 Alkali metal or alkaline earth metal or compound thereof
• CPC Class Codes: Y10T 428/259 Silicic material
• CPC Class Codes: Y10T 428/31616 Next to polyester [e.g., alkyd]
• CPC Class Codes: Y10T 428/3163 Next to acetal of polymerized unsaturated alcohol [e.g., formal butyral, etc.]

Abstract

The present invention is in the field of polymer sheets and multiple layer glass panels having adjustable tint, and, more specifically, the present invention is in the field of polymer sheets and multiple layer glass panels comprising agents that cause a change in light transmission properties when subjected to an electric field.

Claims

1. A polymer sheet comprising:

a polymeric layer comprising poly(vinyl butyral);

a plurality of domains distributed throughout said polymeric layer, wherein said domains are in the form of microcapsules comprising a liquid dielectric material encapsulated in a polymeric coating; and

,

an agent dispersed in said liquid dielectric material, wherein said agent causes an alteration in the amount of visible light that can be transmitted through said polymer sheet in response to the application of an electric field to said polymer sheet.

2. The polymer sheet of claim 1, wherein said polymeric coating comprises poly(vinyl butyral), gelatin, polyvinyl alcohol, cellulosic derivatives, aciacia, carageenan, hydroxylate styrene anhydride copolymers, methyl vinyl ether co-maleic anhydride copolymers, polyvinyl pyridine, polyacrylonitrile, polystyrene, poly(methyl methacrylate), poly(butyl methacrylate), polyhydroxy amide with aldehyde, melamine formaldehyde resin, urea formaldehyde resin, water soluble oligomers of the condensate of melamine, water soluble oligomers of urea, water soluble oligomers of formaldehyde, or polymers of any of the following:

diacyl chloride, vinyl acetate, acrylic acid, butyl acrylate, or t-butyl acrylate.

3. The polymer sheet of claim 1, wherein said dielectric material is selected from the group consisting of a low molecular weight poly(chlorotrifluoroethylene), perfluorinated polyether, aliphatic hydrocarbons, triethylene glycol bis(2-ethyl hexanoate), and a mixture of triethylene glycol (2-ethyl hexanoate) and triethylene glycol bis(2-ethyl hexanoate).

4. The polymer sheet of claim 1, wherein said agent is selected from the group consisting of anatase titania, rutile titania, barium sulfate, silica, magnesium silicate, calcium carbonate, indium tin oxide, antimony tin oxide, carbon black, zinc oxide, lanthanum hexaboride, gold, silver, copper, platinum, palladium, and alloys of the foregoing.

5. The polymer sheet of claim 1, wherein said agent is selected from the group consisting of titania, silica, carbon black, gold, and silver.

6. The polymer sheet of claim 1, wherein said application of an electric field causes said agent to agglomerate.

7. The polymer sheet of claim 1, wherein said polymeric layer further comprises a plasticizing agent.

8. A multiple layer glass panel, comprising:

a first layer comprising,

a polymeric layer comprising poly(vinyl butyral);

a plurality of domains distributed throughout said polymeric layer, wherein said domains are in the form of microcapsules comprising a liquid dielectric material encapsulated in a polymeric coating; and

,

an agent dispersed in said liquid dielectric material, wherein said agent causes an alteration in the amount of visible light that can be transmitted through said first layer in response to the application of an electric field to said first layer;

a second layer comprising an electrically conductive polymeric sheet disposed in contact with said first layer;

a third layer comprising an electrically conductive polymeric sheet disposed in contact with said first layer opposite said second layer; and

at least one layer of glass.

9. The multiple layer glass panel of claim 8, wherein said polymeric coating comprises poly(vinyl butyral), gelatin, polyvinyl alcohol, cellulosic derivatives, aciacia, carageenan, hydroxylate styrene anhydride copolymers, methyl vinyl ether co-maleic anhydride copolymers, polyvinyl pyridine, polyacrylonitrile, polystyrene, poly(methyl methacrylate), poly(butyl methacrylate), polyhydroxy amide with aldehyde, melamine formaldehyde resin, urea formaldehyde resin, water soluble oligomers of the condensate of melamine, water soluble oligomers of urea, water soluble oligomers of formaldehyde, or polymers of any of the following:

diacyl chloride, vinyl acetate, acrylic acid, butyl acrylate, or t-butyl acrylate.

10. The multiple layer glass panel of claim 8, wherein said dielectric material is selected from the group consisting of a low molecular weight poly(chlorotrifluoroethylene), perfluorinated polyether, aliphatic hydrocarbons, triethylene glycol bis(2-ethyl hexanoate), and a mixture of triethylene glycol (2-ethyl hexanoate) and triethylene glycol bis(2-ethyl hexanoate).

11. The multiple layer glass panel of claim 8, wherein said agent is selected from the group consisting of anatase titania, rutile titania, barium sulfate, silica, magnesium silicate, calcium carbonate, indium tin oxide, antimony tin oxide, carbon black, zinc oxide, lanthanum hexaboride, gold, silver, copper, platinum, palladium, and alloys of the foregoing.

12. The multiple layer glass panel of claim 8, wherein said agent is selected from the group consisting of titania, silica, carbon black, gold, and silver.

13. The multiple layer glass panel of claim 8, wherein said application of an electric field causes said agent to agglomerate.

14. The multiple layer glass panel of claim 8, wherein said polymeric layer further comprises a plasticizing agent.

15. The multiple layer glass panel of claim 8, wherein said polymeric sheet of said second layer comprises polyethylene terephthalate.

16. The multiple layer glass panel of claim 15, wherein said polyethylene terephthalate is coated with an electrically conductive material selected from the group consisting of indium tin oxide, antimony tin oxide, indium zinc oxide, metallic coatings, polyaniline, and a conductive polymer.

17. The multiple layer glass panel of claim 8, wherein said polymeric sheet of said third layer comprises polyethylene terephthalate.

18. The multiple layer glass panel of claim 17, wherein said polyethylene terephthalate is coated with an electrically conductive material selected from the group consisting of indium tin oxide, antimony tin oxide, indium zinc oxide, metallic coatings, polyaniline, and a conductive polymer.

19. The multiple layer glass panel of claim 8, further comprising a fourth layer comprising poly(vinyl butyral) disposed in contact with said second layer.

20. The multiple layer glass panel of claim 19, further comprising a fifth layer comprising poly(vinyl butyral) disposed in contact with said third layer.

21. The multiple layer glass panel of claim 20, further comprising a sixth layer of glass disposed in contact with said fourth layer and a seventh layer of glass disposed in contact with said fifth layer.

22. A multiple layer glass panel comprising:

a first glass layer having an electrically conductive coating;

a second glass layer having an electrically conductive coating;

a polymeric layer disposed between said first glass layer and said second glass layer, wherein said polymeric layer comprises poly(vinyl butyral);

a plurality of domains distributed throughout said polymeric layer, wherein said domains are in the form of microcapsules comprising a liquid dielectric material encapsulated in a polymeric coating; and

,

an agent dispersed in said liquid dielectric material, wherein said agent causes an alteration in the amount of visible light that can be transmitted through said polymeric layer in response to the application of an electric field to said polymeric layer.

23. A method of reducing light transmission through an opening, comprising:

providing a multiple layer glass panel in said opening, wherein said multiple layer glass panel comprises a first layer comprising,

a polymeric layer comprising poly(vinyl butyral);

a plurality of domains distributed throughout said polymeric layer, wherein said domains are in the form of microcapsules comprising a liquid dielectric material encapsulated in a polymeric coating; and

,

an agent dispersed in said liquid dielectric material, wherein said agent causes an alteration in the amount of visible light that can be transmitted through said first layer in response to the application of an electric field to said first layer;

a second layer comprising an electrically conductive polymeric sheet disposed in contact with said first layer; and

,

a third layer comprising an electrically conductive polymeric sheet disposed in contact with said first layer opposite said second layer; and

,

connecting a voltage source to said second layer and said third layer, thereby generating an electric field across said first layer.

24. The method of claim 23, wherein the extent to which said light transmission is reduced is dependent in part on the duration of application of said voltage source.

25. A method of reversibly reducing light transmission through an opening, comprising:

providing a multiple layer glass panel in said opening, wherein said multiple layer glass panel comprises a first layer comprising,

a polymeric layer, comprising poly(vinyl butyral);

a plurality of domains distributed throughout said polymeric layer, wherein said domains are in the form of microcapsules comprising a liquid dielectric material encapsulated in a polymeric coating; and

,

an agent dispersed in said liquid dielectric material, wherein said agent causes an alteration in the amount of visible light that can be transmitted through said first layer in response to the application of an electric field to said first layer;

a second layer comprising an electrically conductive polymeric sheet disposed in contact with said first layer; and

,

a third layer comprising an electrically conductive polymeric sheet disposed in contact with said first layer opposite said second layer;

connecting a voltage source to said second layer and said third layer, thereby generating an electric field across said first layer; and

,

reversing the polarity of said voltage source to said second layer and said third layer, thereby reversing said electric field.