Patent
1977-05-11
1978-09-12
Sikes, William L.
G02B 523
Patent
active
041133625
ABSTRACT:
A light valve including suspending materials which have an ability to prevent or substantially retard agglomeration of the particles in suspension during the application of a voltage to the suspension. The materials include aromatic esters which are derivable from aromatic alcohols, such as phenyl acetate, cresyl acetate, para-butylphenyl acetate, para-nonylphenyl acetate, and structurally similar compounds. The suspension also includes, as an additional suspending material, a polymer such as a branched polymeric coating material to coat the particles in suspension and act in combination with the aromatic ester suspending materials to prevent or substantially reduce agglomeration of the particles when a voltage is applied to the suspension. Other suspending materials such as non-aqueous liquids or solids may also form part of the suspending medium of this invention.
REFERENCES:
patent: 3531185 (1970-09-01), Buchsbaum et al.
patent: 3788729 (1974-01-01), Lowell et al.
Forlini Matthew
Saxe Robert L.
Thompson Robert I.
Research Frontiers Incorporated
Sikes William L.
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