Compositions – Light transmission modifying compositions – Modification caused by energy other than light
Patent
1998-07-09
2000-10-03
Tucker, Philip
Compositions
Light transmission modifying compositions
Modification caused by energy other than light
359886, 359245, 359296, G02F 100, G02F 103, G02B 524
Patent
active
061268682
ABSTRACT:
An aqueous composition comprising a polysaccharide or polysaccharide derivative (e.g. a hydroxyalkylcellulose), an electrolyte (e.g. a water-soluble inorganic salt), and an aqueous medium and having a clouding point is hermetically interposed between a pair of electrodes to produced a light shielding device. The clouding point of the aqueous composition can be controlled by adjusting the concentration of the polysaccharide or polysaccharide derivative and/or the species and concentration of the electrolyte. An electric field is applied to the electrodes to control the clouding point of the aqueous composition for selective switching from transparency to opacity or vice versa, thus causing the light shielding device to discharge its light-shielding or dimming function. The light-shielding or dimming effect is obtained regardless of changes in ambient temperature.
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XP-002058405, J. George et al. Pergamon, vol. 49, No. 7, pp. 873-881, (1995).
Daicel Chemical Industries Ltd.
Tucker Philip
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