Method of coating electrostatographic carrier particles

Details Method of coating electrostatographic carrier particles Method of coating electrostatographic carrier particles

1973-12-17

1976-02-24

Martin, William D.

Coating processes

Particles, flakes, or granules coated or encapsulated

Solid encapsulation process utilizing an emulsion or...

118 62, 118303, 427216, 427221, B05D 700

Patent

active

039405141

ABSTRACT:
A method of coating electrostatographic carrier particles comprising introducing an upwardly flowing low pressure gas and a centrally located upwardly flowing high pressure gas at about one-third their full flow rate into a combined fluidized bed and spouted bed coating apparatus, loading carrier particles into the coating apparatus, increasing the flow rate of the low pressure gas to its full flow rate of about 305 cubic feet per minute with heating to heat the carrier particles, increasing the flow rate of the high pressure gas to its full flow rate of about 16 cubic feet per minute at about 1.5 atmospheres to form a fluidized bed of the carrier particles, introducing a solution or dispersion of coating material in a carrier liquid into the fluidized bed whereby the carrier particles are contacted with a cloud of atomized liquid droplets of the coating material in a disperse state resulting in a homogenous distribution of the liquid droplets among the carrier particles, and maintaining the fluidized bed of carrier particles at a temperature and for a time sufficient to volatilize and evaporate the carrier liquid.

REFERENCES:
patent: 2618551 (1948-10-01), Walkup
patent: 3112220 (1963-11-01), Heiser, Jr. et al.
patent: 3196827 (1965-07-01), Wurster et al.
patent: 3293330 (1966-12-01), White
patent: 3526533 (1970-09-01), Jacknow et al.

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