Process for imparting stir-in capabilities to a silver activated

Details Process for imparting stir-in capabilities to a silver activated Process for imparting stir-in capabilities to a silver activated

1988-04-25

1989-08-22

Bell, Janyce

Coating processes

Electrical product produced

Fluorescent or phosphorescent base coating

427 64, 427221, 427229, 427299, B05D 506

Patent

active

048594970

ABSTRACT:
A process is disclosed for pigmenting and coating a silver activated zinc sulfide phosphor and for imparting stir-in capabilities to the phosphor. The process comprises deagglomerating the phosphor, forming an aqueous slurry of phosphor particles, pigment particles, a binding agent which can be latex polymers or copolymers, the binding agent having a glass transition temperature of greater than about 20.degree. C. and a silica-based compound to produce a silica based coating on the phosphor particles, and agitating the slurry, separating the solids from the resulting liquor, and drying the solids at a temperature above the Minimum Film Formation Temperature of the latex to produce the phosphor particles wherein the pigment particles are bonded to them and wherein the pigmented phosphor particles are coated with the silica-based coating. The process comprises also pigmenting the phosphor and imparting stir-in capabilities thereto by the process as described above without adding the coating agent to the slurry. The process comprises also coating the phosphor and imparting stir in capabilities thereto by the above process without the pigments and binding agent.

REFERENCES:
patent: 4049845 (1977-09-01), Lozier
patent: 4128674 (1978-12-01), Hedler
patent: 4206250 (1980-06-01), Oba et al.
patent: 4287257 (1981-09-01), Ohmatoi et al.
"Introduction to Luminescence of Solids", H. W. Leverenz, 1950, pp. 473-475, 1965.

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