Luminescent sheet for stamp and a method for the production ther

Coating processes – Fluorescent or phosphorescent coating

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Details

428690, 428917, 428402, 427 67, 427180, 241172, 241 21, B05D 112, B02C 2302

Patent

active

051821389

ABSTRACT:
A luminescent sheet for stamps comprising a subtrate and a luminescent layer formed on the surface of said substrate, characterized in that said luminescent layer contains fine particles of an inorganic fluorescent pigment, said fine particles being prepared by providing a dispersion containing particles having a mean specific surface area Sw.sub.2 of said inorganic fluorescent pigment in water, and subjecting said dispersion to wet-grinding to obtain an aqueous dispersion containing fine particles having a mean specific surface area Sw.sub.1 of said inorganic fluorescent pigment, and said fine particles satisfying the equation: 2.0.gtoreq.Sw.sub.1 /Sw.sub.2 .gtoreq.1.05.

REFERENCES:
patent: 4692266 (1987-09-01), Costa et al.

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