Compositions – Light transmission modifying compositions – Modification caused by energy other than light
Patent
1997-08-06
1998-06-23
Tucker, Philip
Compositions
Light transmission modifying compositions
Modification caused by energy other than light
252589, 359265, 359275, G02F 100, G02F 115, F21V 904
Patent
active
057701148
ABSTRACT:
The present invention concerns compositions, which comprise an aprotic polar solvent, at least one electrochromic compound, and a compound of the formula I ##STR1## wherein R.sub.1 is, for example, tert-butyl, and R.sub.2 is, for example, --CH.sub.2 --CH.sub.2 --COO--R.sub.7 --, where R.sub.7 is n-butyl or n-pentyl. Among embodiments of the invention are compositions used as media of variable transmittance in electrochromic devices, especially single-compartment, self-erasing, solution-phase electrochromic devices. The compounds of Formula I have increased solubility in aprotic polar solvents used in electrochromic devices and are effective in stabilizing compositions, which comprise at least one electrochromic compound and are useful as media of variable transmittance in electrochromic devices, against degradation due to exposure to UV-radiation. The compounds of Formula I further significantly assist in controlling the gel formation time of cross-linked polymer matrices, which comprise at least one electrochromic compound and are useful as media of variable transmittance in electrochromic devices.
REFERENCES:
patent: 3766205 (1973-10-01), Heller et al.
patent: 5140455 (1992-08-01), Vararaprasad et al.
patent: 5151816 (1992-09-01), Varaprasad et al.
patent: 5239406 (1993-08-01), Lynam
Byker Harlan J.
Srinivasa Ramanujan
Gentex Corporation
Rees Brian J.
Tucker Philip
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