Compositions: coating or plastic – Materials or ingredients – Pigment – filler – or aggregate compositions – e.g. – stone,...
Patent
1993-07-16
1995-01-10
Bell, Mark L.
Compositions: coating or plastic
Materials or ingredients
Pigment, filler, or aggregate compositions, e.g., stone,...
106499, 106502, 106504, C08K 1306
Patent
active
053803620
ABSTRACT:
The invention provides a working fluid for an electrophoretic image display device including a dispersion of finely divided diarylide yellow pigment particles each having a charge of a given polarity and acidic hydrogen surface sites in a suspension medium. Each of the pigment particles are transportable within the suspension medium, under the influence of an electric field, toward or away from at least one transparent plate. Adsorbed on the surface of each pigment particle is a thin layer of a charge control agent having a polyisobutylene chain and a basic anchoring group which reacts with the acidic surface sites to form charge pairs therewith. The polyisobutylene chains extend from the pigment surfaces on which the charge control agent is adsorbed, thereby providing a steric barrier between pigments and preventing agglomeration. The specific gravity of the suspension medium is matched with that of the pigment particles by combining effective amounts of secondary butyl benzene and tetrachloroethylene. A blue solvent dye is added to absorb substantially all light scattered by the pigments when the pigments are transported moved away from the transparent plate being viewed.
REFERENCES:
patent: 3612758 (1971-10-01), Evans
patent: 4093534 (1978-06-01), Carter et al.
patent: 4285801 (1981-08-01), Chiang
patent: 4298448 (1981-11-01), Muller et al.
patent: 4309081 (1982-01-01), Camlibel et al.
patent: 4655897 (1987-04-01), DiSanto et al.
patent: 4680103 (1987-07-01), Solomon et al.
patent: 5206108 (1993-04-01), Felder et al.
Journal of Applied Physics (1978) vol. 49, No. 9, "The Understanding and Elimination of Some Suspension Instabilities in an Electrophoretic Display", P. Murau and B. Singer.
Applied Spectroscopy (1979), vol. 33, No. 2, "Identification of a Charging Mechanism Using Infrared Spectroscopy", B. Fitzhenry.
Journal of the American Chemical Society (1982) vol. 15, "Mechanism of Electric Charging of Particles in Nonaqueous Liquids", F. M. Fowkes, et al.
Journal of the American Chemical Society (1984) vol. 21, "Steric and Electrostatic Contributions to the Colloidal Properties of Nonaqueous Dispersions", F. M. Fowkes and R. J. Pugh.
P. L. Tang, Miniemulsion Polymerization-A Comparative Study of Preparative Variables, Journal of Applied Polymer Sciences, vol. 43, (1991) pp. 1059-1066.
Bell Mark L.
Copytele Inc.
Hertzog Scott L.
Plevy Arthur L.
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