Electrochromic device with plastic substrate

• US 5,471,338 A
• Filed: 11/12/1993
• Issued: 11/28/1995
• Est. Priority Date: 11/12/1993
• Status: Expired due to Term

• Current Assignee: PPG Industries Incorporated (Nouryon BV)
• Original Assignee: PPG Industries Incorporated (Nouryon BV)
• Inventors: Rukavina, Thomas G., Yu, Phillip C., Backfisch, David L.
• Primary Examiner(s): Lee, John D.
• Application Number:
  US08/152,343
• Time in Patent Office: 746 Days
• Field of Search: 359/265-275
• US Class Current: 359/273
• CPC Class Codes: G02F 1/1533 structural features not otherwise provided for

Abstract

An electrochromic article comprising plastic substrates and a method for constructing such an article are disclosed wherein two plastic substrates are coated with a primer to adhere an electroconductive metal oxide film, onto which are deposited an electrochromic film and a complementary film respectively. The two coated plastic substrates are assembled to form a cavity into which is placed a solution of monomers which are polymerized to form an ion-conducting copolymer.

Claims

1. An electrochromic article comprising:

a. a first transparent polymeric substrate;

b. a first transparent primer layer of a copolymer of acrylic acid and a monomer selected from the group consisting of hydroxyethylacrylate, cyanoethylacrylate, methyl methacrylate and mixtures thereof deposited on a surface of said first substrate;

c. a first transparent electroconductive metal oxide film deposited on said first primer layer;

d. a transparent electrochromic film deposited on said first electroconductive metal oxide film;

e. a second transparent polymeric substrate;

f. a second transparent primer layer of a copolymer of acrylic acid and a monomer selected from the group consisting of hydroxyethylacrylate, cyanoethylacrylate, methyl methacrylate and mixtures thereof deposited on a surface of said second substrate;

g. a second transparent electroconductive film deposited on said second primer layer;

h. a transparent complementary electrochromic film deposited on said second electroconductive film; and

i. a transparent ion-conducting polymer disposed between and bonded to said electrochromic and complementary electrochromic films.

2. An article according to claim 1, wherein each of said polymeric substrates is selected from the group consisting of polycarbonates and acrylics.

3. An article according to claim 1, wherein each of the polymeric substrates is a polymer reaction product of a monomer selected from the group consisting of diethylene glycol bis(allylcarbonate), bisphenol A and methyl methacrylate.

4. An article according to claim 1, wherein each of said electroconductive films is selected from the group consisting of tin oxide and indium/tin oxide.

5. An article according to claim 1 wherein said electrochromic film deposited on said first electroconductive metal oxide film is tungsten oxide.

6. An article according to claim 1, wherein said complementary film is iridium oxide.

7. An article according to claim 1, wherein said ion-conducting polymer is a proton-conducting polymer.

8. An article according to claim 1 wherein said primer layer on each of said polymer substrates is a copolymer of acrylic acid and methyl methacrylate monomers in a molar ratio of about 3:

1 to 1;

3.

9. An electrochromic article comprising:

a. a transparent polymeric substrate;

b. a transparent copolymer primer layer of a copolymer of acrylic acid and a monomer selected from the group consisting of hydroxyethylacrylate, cyanoethylacrylate, methyl methacrylate and mixtures of said monomers deposited on a surface of said substrate;

c. a transparent electroconductive metal oxide film deposited on said primer layer;

d. a transparent electrochromic film deposited on said electroconductive metal oxide film;

e. a second transparent polymeric substrate;

f. a second transparent copolymer primer layer of a copolymer of acrylic acid and a monomer selected from the group consisting of hydroxyethylacrylate, cyanoethylacrylate, methyl methacrylate and mixtures of said monomers deposited on a surface of said second substrate;

g. a second transparent electroconductive film deposited on said second primer layer;

h. a transparent complementary electrochromic film deposited on said second electroconductive film; and

i. a transparent proton-conducting polymer of 2-acrylamido-2-methylpropanesulfonic acid disposed between and bonded to said electrochromic and complementary films.

10. An article according to claim 9 wherein said proton-conducting polymer is a copolymer of 2-acrylamido-2-methylpropanesulfonic acid and dimethylacrylamide.

11. An article according to claim 10 wherein the thickness of the proton-conducting polymer is from 0.001 to 0.025 inch.

12. An electrochromic article comprising the following transparent layers:

a. a substrate polymerized from diethylene glycol bis(allylcarbonate) monomer;

b. a primer layer copolymerized from acrylic acid and methyl methacrylate deposited on a surface of said substrate;

c. an electroconductive film comprising tin-doped indium oxide deposited on said primer layer;

d. an electrochromic film of tungsten oxide deposited on said electroconductive film;

e. a second substrate polymerized from diethylene glycol bis(allylcarbonate) monomer;

f. a second primer layer copolymerized from acrylic acid and methyl methacrylate deposited on a surface of said second substrate;

g. a second electroconductive film comprising tin-doped indium oxide deposited on said second primer layer;

h. a complementary electrochromic film of iridium oxide deposited on said second electroconductive film; and

i. a proton-conducting copolymer of 2-acrylamido-2-methylpropanesulfonic acid and N,N-dimethylacrylamide disposed between and bonded to said electrochromic films.