Stock material or miscellaneous articles – Article having latent image or transformation
Reexamination Certificate
1999-01-20
2001-10-02
Jones, Deborah (Department: 1775)
Stock material or miscellaneous articles
Article having latent image or transformation
C428S195100, C428S207000, C428S690000, C428S913000, C252S301160, C106S400000
Reexamination Certificate
active
06296911
ABSTRACT:
The present invention relates to a method and product which are intended to enable a variable support to be sensitive to different external stimuli such as the intensity of illumination, ambient humidity and temperature, reflecting the effects of these in its chromatic characteristics.
At present, different types of phosphorescent products are known which are applied as a coating for objects or as an integral part of the material of the latter, or as a laminar covering or in the form of paint in order to cause the said laminar or other type of objects to have a phosphorescent effect. It makes it possible to manufacture different objects which have a certain luminous brightness in the dark, that is to say, they exhibit phosphorescence.
The present invention is intended to disclose a new method and corresponding products in order to enable that the objects to which there are applied the products manufactured in accordance with the present invention to possess chromatic characteristics varying according to different stimuli. In particular, the object of the present invention consists in obtaining objects which simultaneously have phosphorescent characteristics and additionally exhibit chromatic variation and variation of the intensity of the luminescence as the humidity and/or temperature vary. It will therefore be understood that the present invention will make it possible to obtain a series of new and advantageous functions and that it will be applicable to a very wide field of different objects in real life, such as different types of toys, coverings for areas of walls, for example, by means of stickers that can be applied also to furniture or to other places, or as a mouldable mass for producing different types of objects, for paints, obtaining by their application the result that the new chromatic characteristics are transmitted to the objects receiving them, for inks for different applications, printing of textiles, coating of cables in order to obtain indications of humidity and/or excess temperature, granulates and raw materials for the manufacture of other objects, etc.
The method which is the subject of the present invention will be based especially on the formation of one or more suspensions, with a base which is preferably transparent or translucent, which are intended to include a photoluminous, that is to say, luminescent, pigment, a pigment having chromatics which vary with humidity, and another pigment or pigments which vary in colour with the temperature. A single suspension or a plurality of suspensions may be produced, in such a manner that in the case of a single suspension the different pigments will be incorporated in it, and in the case of a plurality of suspensions being constituted, the pigments mentioned will remain in suspension individually in each of them or combined in pairs, preferably adopting in the case of multiple suspensions a liquid consistency in order to allow the application of the suspensions in the form of successive layers on the object on which it is desired to obtain the effects of combined variation of luminescence and colour. The bases to be used may be of very different types, for example, plastic granules, transparent vinyl base for paints (liquid), liquid acrylic base, etc. In the case of application of the suspensions in the form of several layers it is preferable for the outer layers to be transparent and porous so as to allow the entry of light to the pigment-bearing layer or layers, the luminosity of which is excited by the action of light, providing a specific period of luminescence in the dark.
To implement the present invention, variable specific pigments may be used, provided that they produce the effects indicated. There may be mentioned, for example, as luminescent pigments, the ZnS-based pigments or others, in particular the LUMILUX pigments manufactured by the German company Riedel-de Haën. However, it is clear that any luminescent pigment, that is to say, which has a luminous effect in the dark, could be used for the present invention.
As a pigment the chromatics of which depend on the humidity, there may be mentioned, for example, cobalt chloride and the like or any other tracer pigments the colour of which depends on the humidity.
As temperature-sensitive pigments or thermochromic pigments there may be mentioned cobalt iodide or any other which has analogous properties of colour change in response to the temperature, for example, those termed AZUL BEZATHERM B from the Swiss company CHT.
Although the most complete combination of pigments will be that which contains photoluminous pigments, thermo-chromic pigments and pigments the chromatics of which are sensitive to humidity, it will also be possible to use photoluminous pigments combined only with hygrometric pigments or with thermochromic pigments.
The base or background will preferably be white, silver or a reflective colour, although the different suspensions of pigments may be arranged on any base material.
The percentages of the different pigments in relation to the suspension may also vary within wide limits, the following being indicated by way of example: pehotoluminous pigment : preferably based on ZnS: Cu, of
0.1% to 350% by weight related to the base
humidity-sensitive pigment : preferably cobalt chloride, from 0.01% to 50%
thermochromic pigment : preferably cobalt iodide, from 0.01% to 50%.
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patent: 5298190 (1994-03-01), Mone et al.
patent: 5795379 (1998-08-01), Schwenk et al.
patent: 8206606 (1981-10-01), None
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patent: 7/258568 (1995-09-01), None
patent: 7/276733 (1997-04-01), None
patent: WO 98/07787A1 (1998-02-01), None
Patent Abstracts of Japan, CD-ROM MIPAJ 9704 PAJ JP-09-095875 Apr. 18 1997.
Patent Abstracts of Japan, CD-ROM MIPAJ 9510 PAJ JP-07-258568 Oct. 9 1995.
Bahta Abraham
Darby & Darby
Jones Deborah
LandOfFree
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