Coating processes – Particles – flakes – or granules coated or encapsulated – Inorganic base
Patent
1976-03-31
1978-12-05
Silverberg, Sam
Coating processes
Particles, flakes, or granules coated or encapsulated
Inorganic base
313466, 428403, 428404, 428407, 25230165, 427 68, 427 71, 427219, C09K 1108, C09K 1120, C09K 1142
Patent
active
041286740
ABSTRACT:
A pigmented phosphor comprises a core of a phosphor particle having a light modifying layer thereon. The light modifying layer is comprised of a co-precipitated mixture of silica or pyrophosphate and a pigment which modifies the light output of the energized phosphor. The phosphor is coated by first preparing an unique pigment stock suspension containing the pigment, water, and a polyacrylamide dispersant. The stock solution is then diluted and phosphor particles are added thereto and the mixture is vigorously stirred. The pH of the mixture can be adjusted to about 5 by the addition of acetic acid and then a small amount of positively charged colloidal silica or pyrophosphate is added. After mixing, the pH is raised to about 9 by the addition of a base or a salt which causes a gel to form and the silica or pyrophosphate and the pigment to co-precipitate out upon the phosphor particles.
REFERENCES:
patent: 2909444 (1959-10-01), Seats
patent: 3269969 (1966-08-01), Fikentsher
patent: 3684731 (1972-08-01), Frey
patent: 3721637 (1973-03-01), Schultz
patent: 3875449 (1975-04-01), Byler
patent: 3886394 (1975-05-01), Lipp
patent: 4020231 (1977-04-01), Hedler et al.
GTE Sylvania Incorporated
McNeill William H.
Silverberg Sam
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