Chemistry: electrical and wave energy – Processes and products – Electrophoresis or electro-osmosis processes and electrolyte...
Patent
1994-02-17
1996-12-31
Bell, Bruce F.
Chemistry: electrical and wave energy
Processes and products
Electrophoresis or electro-osmosis processes and electrolyte...
204486, 204490, 204497, C25D 1302, C25D 1310
Patent
active
055890482
ABSTRACT:
A method for the production of a radiographic screen comprising the following steps:
1) dispersing phosphor particles in an organic liquid in the presence of a charge controlling agent that charges said phosphor particles with a positive or negative net charge,
2) arranging said dispersion between a pair of electrodes, wherein one of said electrodes is or carries a conductive support of said radiographic screen,
3) applying and maintaining between said electrodes a sufficiently high direct current voltage to deposit charged phosphor particles onto said conductive support, and
4) separating said support carrying electrophoretically deposited phosphor particles from said organic liquid,
wherein the dispersing of said phosphor particles proceeds by means of an organic surface active compound acting as dispersing agent for said phosphor particles, and said phosphor particles are electrostatically charged through adsorption thereon of ionic components of said organic surface active compound and/or through adsorption of cations or anions stemming from an ionic inorganic compound incorporated in said liquid.
REFERENCES:
patent: 2851408 (1958-09-01), Cerulli
patent: 3743833 (1973-07-01), Martic et al.
Damen Guy
De Jaeger Nikolaas
Van Havenbergh Jan
Winter Gerhard
Agfa-Gevaert N.V.
Bell Bruce F.
Starsiak Jr. John S.
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