Compositions – Inorganic luminescent compositions with organic...
Patent
1998-12-15
2000-11-14
Koslow, C. Melissa
Compositions
Inorganic luminescent compositions with organic...
25230134, 25230135, 2523014R, 2523013R, C04B 2602, C04B 1402, C04B 1406, C04B 1422, C08J 500
Patent
active
061465488
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention of this application relates to noctilucent or fluorescent artificial stone. More particularly, the invention of this application relates to artificial stone having noctilucent properties such as light storing properties or light emitting properties accompanied by ultraviolet ray absorption useful for building materials, materials for indication of position by emission of light in a dark environment, decorating materials etc.
BACKGROUND ART
Hitherto, artificial stone is known to be produced by crushing natural stone, mixing this with resin, grinding and hardening. And, regarding this artificial stone, processes are known to produce stone materials therefrom having the appearance of marble, granite, etc., and furthermore such materials are superior in hardness, strength.
For improving the performance of such artificial stone, adding an optical function using a noctilucent substance as a light storing material, or a fluorescent substance of an ultraviolet ray emitting material, emitting light accompanied by ultraviolet ray absorption, has been proposed.
However, in the case of a conventional noctilucent, or fluorescent artificial stone, mentioned above, only a part of that binder resin component or aggregate exposed on the surface part of artificial stone functions to emit light. Thus, there was disadvantage that light storing material etc. contained inside the formed body of artificial stone does not function to emit light. Fluorescent materials are very expensive and since even the addition of a small quantity raises the total cost of artificial stone product about 3 to 10 times, conventional artificial stone containing internal fluorescent substances is not practical costwise.
On the other hand, if the amount of noctilucent or fluorescent substance is reduced for cost reduction, it follows that the function of light emission or light storage is impaired.
Therefore, in order to improve the light function of artificial stone, the realization of a new artificial stone superior in function and effect, being capable of sufficient light emission, by the use of less noctilucent or fluorescent substance of a light storing material, for cost reduction, has been desired.
DISCLOSURE OF INVENTION
Accordingly, this invention seeks to solve the above-mentioned problem, by providing an artificial stone containing inorganic aggregate and resin, with the noctilucent or fluorescent material comprising at least part of the inorganic aggregate. The composition contains at 5 to 65 wt % of total amount, of a transparent inorganic aggregate, baked or normal temperature coated on its surface with a noctilucent substance of a light storing material, or a fluorescent substance having light emitting properties accompanied by ultraviolet ray absorption.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 of the attached drawing is a sectional view which illustrates the construction of the artificial stone of this invention.
BEST MODE FOR CARRYING OUT THE INVENTION
The invention is described in more detail below.
The artificial stone, in this invention, contains as the basic component, inorganic aggregate and resin and, at least a part of the incorporated inorganic aggregate is a transparent inorganic aggregate having surface coating layer consisting of a noctilucent or fluorescent substance at 5 to 65 wt % of the total amount of artificial stone composition.
In the case of this amount being less than 5 wt %, sufficient light emitting properties, particularly, good light emission thickness is not obtained. And, in the case of exceeding 65 wt %, it is not economical in relation to light emitting properties.
Regarding the inorganic aggregate itself, it may not be only a transparent one, but in general, an inorganic aggregate incorporated at more than 5 wt %, preferably 10 to 90 wt %, and further preferably 20 to 80 wt %. It should be a transparent inorganic aggregate coated with noctilucent or fluorescent substance.
Incidentally, as to the size (particle diameter) of the inorganic aggregate, the following two
REFERENCES:
patent: 5358993 (1994-10-01), Timm et al.
patent: 5422391 (1995-06-01), Inoue
Doppel Co. Ltd.
Koslow C. Melissa
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