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Polymeric electrochromic devices

An electrochromic, polymer technology, used in transportation and packaging, synthetic resin layered products, instruments, etc., can solve problems such as poor conductivity of coating films, film ruptures, and plastic substrates that cannot withstand high deposition temperatures

Inactive Publication Date: 2005-01-26
PPG IND OHIO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, plastic substrates cannot withstand such high deposition temperatures
Therefore, the plastic substrate must be deposited at a low temperature, which makes the conductivity of the coating film poor. In order to improve the conductivity of the coating film and improve the consistency of color conversion, a thicker film must be used
However, when such thicker films are deposited, more defects are caused in the film structure, for example, causing film cracks

Method used

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  • Polymeric electrochromic devices
  • Polymeric electrochromic devices

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0066] The primer composition was prepared as follows:

[0067] The cyanoethylacrylate / acrylic acid oligomer was prepared at 25% solids in cyclohexane. The crosslinker 2-(3,4-epoxycyclohexyl-5,5-spiro-3,4-epoxy)cyclohexane-idexane is added to react with at least 50% of the carboxylic acid groups. Dibutyl dilaurate was added as catalyst.

[0068] The prepared solution was applied to the surface of an elongated acrylic plastic substrate and cured at a temperature of 190°F (88°C). A plastic substrate including a primer composition on its surface was placed in a vacuum chamber, and an indium tin oxide (ITO) coating was sputter-deposited from a metal cathode on the surface of the primer layer to a resistance value of 10Ω / □.

[0069] This process is repeated for the second substrate.

[0070] Electrochromic devices were fabricated from two elongated acrylic plastic substrates coated with an indium tin oxide coating. More specifically, a solution of xylene viologen perchlorate, d...

example 2

[0073] A primer composition was prepared using 0.1 equivalents of carbonate diol, KM-1667 solids from Stahl Corp, 0.9 equivalents of trimethylolpropane, and 1.0 equivalents of solids polyisocyanate Mondur MR from Bayer Corp. The final solution was a 10% solids solution in diacetone alcohol.

[0074] The freshly prepared solution was applied to one surface of two substrates made of solid Lexan® polycarbonate sold by G.E.Corp and cured at 230°F (110°C) for 4 hours. The composite substrates were placed in a vacuum chamber, and then a conductive coating of ITO was sputter-deposited from a metal cathode on top of the primer composition coating on each substrate, with sheet resistance values ​​in the range of 3-10Ω / □.

[0075] The electrochromic device described in Example 1 was constructed using two coated substrates. When a voltage of 1.0 V was applied, the transmittance of the device switched from 67% to 0.2%. Electrochromic devices were stored for 2 months before testing. Alt...

example 3

[0077] Primer compositions were prepared at 25% solids in cyclohexanone for elongated acrylic and Plexglas(R) acrylic flakes composed of methyl methacrylate / acrylic copolymer. Cycloaliphatic diepoxide is added to react at least 25% of the carboxylic acid groups. The final solution was 10% solids.

[0078] As-made primer sets are applied to stretched acrylic and Plexglas acrylic sheets and cured at temperatures below 195°F (91°C). By magnetron sputtering from the metal cathode, an ITO conductive coating was applied to each surface with the primer, and the sheet resistance value of the ITO conductive coating was 3Ω / □.

[0079] Electrochromic devices such as those described in Example 1 were prepared from freshly prepared elongated acrylic substrates and Plexglas substrates. The transmittance of the device switched from 62% to 0.1% when a voltage of 1V was applied to the conductive coating. Electrochromic devices were stored for 3 months before testing. Although the electroch...

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Abstract

An electrochromic device comprising: a first substrate (12) having at least one polymer surface (28); a primer coating (32) along the polymer surface; a first transparent conductive coating along the primer of the first substrate (18), wherein the primer layer adheres the first conductive coating to the polymer surface of the first substrate; a second substrate (14), which is spaced from the first substrate with a cavity defined therebetween the second conductive transparent coating (20) on the surface (30) of the second substrate, so that the first transparent conductive coating faces the second transparent conductive coating, wherein at least one substrate in the first substrate and the second substrate is transparent; the electrochromic medium (22) is contained in the chamber, the transmittance of the electrochromic medium is reduced when the first and second conductive coatings are powered, and a potential is established through the electrochromic medium, wherein the electrochromic medium Compatible with primer coats. The two substrates are constructed of plastic and / or transparent material, if desired. In another embodiment of the electrochromic device, at least one of the first and second conductive coatings (18, 20) is two-part, the first conductive coating part is deposited from a metal cathode, the second conductive The coating is partially deposited from a ceramic cathode.

Description

[0001] Cross references to related patent applications [0002] This application claims priority to US Patent Application No. 09 / 978882, filed October 16, 2001. technical field [0003] The present invention relates to electrochromic devices comprising polymeric substrate materials. Specifically, it relates to plastic electrochromic devices specially used for transparent objects and aircraft windows. Background technique [0004] Electrochromic devices for use in a variety of applications are well known in the industry. Such electrochromic devices typically comprise a sealed chamber defined by two glass pieces separated by a gap or space containing the electrochromic medium. Electrochromic media typically include an anodic compound and a cathodic compound together in solution. Glass substrates typically include a transparent conductive layer coated on the glass surface and in contact with the electrochromic medium. The conductive layers on the two glass substrates are el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/15B32B27/06G02F1/00G02F1/153
CPCG02F1/1533B32B27/06Y10T428/31507
Inventor 林嘉正汤玛斯·G·卢卡维纳罗伯特·M·胡尼亚
Owner PPG IND OHIO INC
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