Ruggedized switchable glazing, and/or method of making the same

• US 9,333,728 B2
• Filed: 02/20/2008
• Issued: 05/10/2016
• Est. Priority Date: 11/06/2007
• Status: Active Grant

• Current Assignee: Guardian Glass LLC (KOCH Industries Incorporated)
• Original Assignee: Guardian Industries Corporation (KOCH Industries Incorporated)
• Inventors: Veerasamy, Vijayen S.
• Primary Examiner(s): Kim, Dennis Y
• Application Number:
  US12/071,383
• Publication Number:
  US 20090115922A1
• Time in Patent Office: 3,002 Days
• US Class Current: 1/1
• 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 17/10045 with at least one intermediate layer consisting of a glass sheet
• CPC Class Codes: B32B 17/10055 with at least one intermediate air space
• 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 17/10229 Metallic layers sandwiched by dielectric layers
• CPC Class Codes: B32B 17/10504 Liquid crystal layer
• CPC Class Codes: B32B 17/10761 containing vinyl acetal
• CPC Class Codes: B32B 17/10788 containing ethylene vinylacetate
• CPC Class Codes: B32B 2367/00 Polyesters, e.g. PET, i.e. polyethylene terephthalate
• CPC Class Codes: C03C 17/36 at least one coating being a metal
• CPC Class Codes: C03C 17/3618 Coatings of type glass/inorganic compound/other inorganic layers, at least one layer being metallic
• CPC Class Codes: C03C 17/3626 one layer at least containing a nitride, oxynitride, boronitride or carbonitride
• CPC Class Codes: C03C 17/3639 Multilayers containing at least two functional metal layers
• CPC Class Codes: C03C 17/3644 the metal being silver
• CPC Class Codes: C03C 17/3652 the coating stack containing at least one sacrificial layer to protect the metal from oxidation
• CPC Class Codes: C03C 17/366 Low-emissivity or solar control coatings
• CPC Class Codes: C03C 17/3681 the multilayer coating being used in glazing, e.g. windows or windscreens
• CPC Class Codes: C03C 2217/74 UV-absorbing coatings
• CPC Class Codes: E06B 2009/2417 Light path control; means to control reflection
• CPC Class Codes: E06B 2009/2464 : featuring transparency control by applying voltage, e.g. LCD, electrochromic panels
• CPC Class Codes: E06B 3/6722 : with adjustable passage of light
• 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 1/1333 : Constructional arrangements; Manufacturing methodsG02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/1334 : based on polymer dispersed liquid crystals, e.g. microencapsulated liquid crystals
• CPC Class Codes: G02F 1/137 : characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
• CPC Class Codes: G02F 1/13756 : the liquid crystal selectively assuming a light-scattering state G02F1/1334, G02F1/13718 take precedence
• CPC Class Codes: G02F 2201/086 : UV absorbing

Abstract

Certain example embodiments of this invention relate to ruggedized switchable glazings, and/or methods of making the same. The PDLC stack of certain example embodiments includes an outer substrate, a low-E UV blocking coating deposited on an inner surface of the outer substrate, a first PVB or EVA laminate, a first PET layer, a first TCO layer, the PDLC layer, a second TCO layer, a second PET layer, a second PVB or EVA laminate, and an inner substrate. The substrates may be glass substrates. The low-E UV blocking coating may include at least two layers of or including silver and/or may include one or more IR layers. Thus, certain example embodiments may advantageously reduce one or more problems associated with residual haze, color change, flicker, structural changes in the polymer and/or the LC, degradations in state-switching response times, delamination, etc. The PDLC stack of certain example embodiments may be used in connection with any form of coated article, such as, for example, windows, windshields, IG units, etc.

Claims

1. A window comprising:

an inner glass substrate and an outer glass substrate, the inner and outer glass substrates being substantially parallel to one another;

a multi-layer low-emissivity (low-E) ultraviolet (UV) blocking coating comprising first and second IR reflecting layers comprising silver supported by an inner surface of the outer glass substrate, the low-E UV blocking coating blocking significant amounts of UV in the range of from about 380-400 nm;

a liquid crystal inclusive layer disposed between at least the inner and outer glass substrates;

first and second substantially transparent conductive layers, the first and second substantially transparent conductive layers being provided between the liquid crystal inclusive layer and the outer and inner glass substrates, respectively;

first and second polymer inclusive laminating layers, the first laminating layer provided between at least the liquid crystal inclusive layer and the outer glass substrate and the second laminating layer provided between at least the liquid crystal inclusive layer and the inner glass substrate;

at least one bus bar in electrical communication with at least one of the first and second transparent conductive layers so as to cause the liquid crystal inclusive layer to become activated when a voltage is applied thereto; and

a polymer barrier at a periphery of the liquid crystal inclusive layer, the polymer barrier being positioned to reduce (a) migration of the first and/or second polymer inclusive laminating layers over time, and (b) an amount of pushing against the liquid crystal inclusive layer,

wherein the multi-layer low-E UV blocking coating comprises at least one IR reflecting layer and at least one UV blocking layer so that no more than about 20% of ambient light having a wavelength of from 380-400 nm reaches the liquid crystal inclusive layer, and

wherein the window has a visible transmission of at least about 55% when the liquid crystal inclusive layer is activated.

2. The window of claim 1, wherein the first and second polymer inclusive laminating layers are encapsulated at edges thereof.

3. The window of claim 1, wherein off-axis haze is less than or equal to about 4 at an incidence of approximately 45°

when the liquid crystal inclusive layer is activated.

4. The window of claim 1, wherein off-axis haze is less than or equal to about 3 at an incidence of approximately 45°

when the liquid crystal inclusive layer is activated.

5. The window of claim 1, wherein off-axis haze is less than or equal to about 2 at an incidence of approximately 45°

when the liquid crystal inclusive layer is activated.

6. The window of claim 1, wherein the liquid crystal inclusive layer is stable up to at least about 110°

C.

7. The window of claim 1, wherein the liquid crystal inclusive layer is stable up to at least about 120°

C.

8. The window of claim 1, wherein the window has a visible transmission of no more than 1.815% when the liquid crystal inclusive layer is deactivated.

9. An insulating glass window unit, comprising:

at least first, second and third substantially parallel glass substrates;

a multi-layer low-E UV blocking coating comprising first and second IR reflecting layers comprising silver supported by a surface of the second glass substrate facing the third substrate;

a liquid crystal inclusive layer disposed between the second and third glass substrates;

first and second transparent conductive layers, the first and second transparent conductive layers being provided between at least the liquid crystal inclusive layer and the second and third glass substrates, respectively;

at least one bus bar electrically connected to at least one of the first and second transparent conductive layers so as to cause the liquid crystal inclusive layer to become activated when at least a predetermined voltage is applied to the bus bar,

wherein the first and second glass substrates are spaced apart from each other,

wherein the multi-layer low-E UV blocking coating comprises at least one UV blocking layer in order to block significant amounts of UV radiation in the range of from 380-400 nm so that no more than about 20% of ambient light having a wavelength of from 380-400 nm reaches the liquid crystal inclusive layer, and

wherein the insulating glass unit has a visible transmission of at least about 50% and is clear when the liquid crystal inclusive layer is activated, and appears whitish when the liquid crystal inclusive layer is deactivated as a result of light scattering caused by the liquid crystal inclusive layer.

10. The insulating glass window unit of claim 9, further comprising first and second polymer inclusive laminating layers that are encapsulated at edges thereof.

11. The insulating glass window unit of claim 9, wherein off-axis haze is less than or equal to about 4 at an incidence of approximately 45°

when the liquid crystal inclusive layer is activated.

12. The insulating glass window unit of claim 9, wherein off-axis haze is less than or equal to about 3 at an incidence of approximately 45°

when the liquid crystal inclusive layer is activated.

13. The insulating glass window unit of claim 9, wherein off-axis haze is less than or equal to about 2 at an incidence of approximately 45°

when the liquid crystal inclusive layer is activated.

14. The insulating glass window unit of claim 9, wherein the liquid crystal inclusive layer is stable up to at least about 110°

C.

15. The insulating glass window unit of claim 9, wherein the liquid crystal inclusive layer is stable up to at least about 120°

C.

16. The insulating glass window unit of claim 9, wherein the insulating glass unit has a visible transmission of no more than 1.815% when the liquid crystal inclusive layer is deactivated.