Coated pigmented phosphors and process for producing same

Coating processes – Electrical product produced – Fluorescent or phosphorescent base coating

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427218, 427219, 427380, B05D 506

Patent

active

046845402

ABSTRACT:
A pigmented silicate coated phosphor is disclosed and a process for producing the phosphor. The process involves preparing a relatively uniform aqueous mixture of particles of a phosphor, particles of a deagglomerated pigment, and a free flowing agent and then adding a precipitating agent to the mixture in an amount sufficient to cause the free flowing agent and pigment to co-precipitate upon and coat the phosphor, followed by separating the pigmented phosphor from the resulting liquor. A relatively uniform mixture is formed of the resulting dried phosphor, a water soluble silicate, and water the water being in an amount of sufficient to allow the silicate to coat the surface of the phosphor particles. The mixture is heated at a sufficient temperature for a sufficient time with sufficient agitation to produce the final non-agglomerated silicate coated pigmented phosphor.

REFERENCES:
patent: 2817599 (1957-12-01), Edwards et al.
patent: 3544354 (1970-12-01), Kachel
patent: 4263339 (1981-04-01), Fischer
patent: 4423128 (1983-12-01), Koike et al.
patent: 4473634 (1984-09-01), Dodds et al.

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