Method for reclaiming pigment-attached red-emitting phosphor

Details Method for reclaiming pigment-attached red-emitting phosphor Method for reclaiming pigment-attached red-emitting phosphor

1993-09-24

1995-05-23

Bell, Janyce

Coating processes

Restoring or repairing

427 64, 427 68, 427 71, 427345, B32B 3500, B05D 506

Patent

active

054180058

ABSTRACT:
A method for reclaiming a pigment-attached red-emitting phosphor recovered from a manufacturing process for a color picture tube, which comprises treating the phosphor with an aqueous solution containing NaOH, NaClO and H.sub.2 O.sub.2 and then treating it with a weak acid, whereby the pigment can be prevented from exfoliation by suppressing the dissolution of the binder which attaches the pigment to the phosphor, and blue- and green-emitting phosphors contained as contaminants in the recovered red-emitting phosphor can be completely removed. The method provides a reclaimed red-emitted phosphor with high luminance and a good coating property.

REFERENCES:
patent: 4213894 (1993-05-01), Kim
patent: 4517224 (1985-05-01), Ditty

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