Electrochromic device

Details Electrochromic device Electrochromic device

1991-11-01

1992-06-23

Stoll, Robert L.

Compositions

Light transmission modifying compositions

Modification caused by energy other than light

252586, 359265, 359270, G02F 100, G02F 101, G02B 523

Patent

active

051240807

ABSTRACT:
An improvement of electrochromic devices incorporating a perfluorosulfonic acid polymer ion conducting layer interposed between a working electrode and a counter electrode. The improvement relates to the composition of the perfluorosulfonic acid polymer of the ion conducting layer. In the present invention the composition of the perfluorosulfonate polymer layer is a polymer comprising a substantially fluorinated backbone which has recurring pendant groups attached thereto represented by the formula --O--(CFR'.sub.f).sub.b --(CFR.sub.f).sub.a --SO.sub.3 --, where a=0-3, b=0-3, a+b=at least 1, and R.sub.f and R'.sub.f are independently selected from the group consisting of a halogen and a substantially fluorinated alkyl group having one or more carbon atoms. One example of such a polymer is the copolymer of tetrafluoroethylene and 1,1,2,2-tetrafluoro-2-((trifluoroethenyl)oxy)ethane sulfonic acid having an equivalent weight of about 800. The primary benefit of the present invention is that the electrochromic device darkens sufficiently to be useful when the device is operated at high temperature such as can be encountered in an automobile electrochromic sun roof on a sunny day in a hot climate.

REFERENCES:
patent: 3971624 (1976-07-01), Bruesch et al.
patent: 4116545 (1978-09-01), Reddy
patent: 4193670 (1980-03-01), Giglia et al.
patent: 4231641 (1980-11-01), Randin
patent: 4330654 (1982-05-01), Ezzell et al.
patent: 4337137 (1982-06-01), Ezzell
patent: 4337211 (1982-06-01), Ezzell et al.
patent: 4338000 (1982-07-01), Kamimori et al.
patent: 4358412 (1982-11-01), Ezzell et al.
patent: 4358545 (1982-11-01), Ezzell et al.
patent: 4361385 (1982-11-01), Huang et al.
patent: 4433082 (1984-02-01), Grot
patent: 4462877 (1984-07-01), Ezzell
patent: 4470889 (1984-09-01), Ezzell et al.
patent: 4478695 (1984-10-01), Ezzell et al.
patent: 4515989 (1985-05-01), Ezzell et al.
patent: 4554112 (1985-11-01), Ezzell et al.
patent: 4578512 (1986-03-01), Ezzell et al.
patent: 4687821 (1987-08-01), Ezzell et al.
patent: 4731263 (1988-03-01), Martin et al.
patent: 4768865 (1988-09-01), Greenberg et al.
patent: 4804727 (1989-02-01), Ezzell et al.
C. R. Martin et al., Dissolution of Perfluorinated Ion Containing Polymers, Anal. Chem., 54, 1639-41 (Aug. 1982).
G. G. Scherer et al., ESCA Investigation of Nafion Membranes, 52-59.
Jean-Paul Randin, Ion-Containing Polymers as Semisolid Electrolytes in WO.sub.3 -Based Electrochromic Devices, J. Electrochem. Soc., 129(6), 1215-20 (1982).

Affiliated with

Also associated with

Rating

Electrochromic device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Electrochromic device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electrochromic device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-931361