Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter
Patent
1976-03-31
1977-04-26
Kendall, Ralph S.
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Particulate matter
2523014P, 2523014F, 427218, 427219, 428404, C09K 1108, C09K 1120, C09K 1142
Patent
active
040202313
ABSTRACT:
A composite article 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 a free-flowing agent such as silica or pyrophosphate and a pigment which modifies the light output of the energized phosphor. Also disclosed is a method of making the composite article which comprises the steps of preparing an aqueous mixture of particles of phosphor, particles of a pigment and a positively charged colloidal silica or pyrophosphate and mixing thoroughly. After mixing, a base, in the case of silica, or a salt which will form an insoluble pyrophosphate in the case of the pyrophosphate, is added thereto in sufficient amount to gel the mixture causing the silica or pyrophosphate and the pigment to co-precipitate upon and coat the phosphor particles. After the coating operation the supernatant liquid is removed and the coated phosphor is dried.
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Hedler Robert A.
Slobbe W. Wentworth
GTE Sylvania Incorporated
Kendall Ralph S.
McNeill William H.
O'Malley Norman J.
Orner Robert T.
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