Base material having a dyed membrane on the surface thereof, and

Details Base material having a dyed membrane on the surface thereof, and Base material having a dyed membrane on the surface thereof, and

1985-12-11

1987-06-23

Kittle, John E.

Stock material or miscellaneous articles

Composite

Of quartz or glass

428442, 428520, 8506, 350311, B32B 1710, B32B 2730, D06P 141, G02B 520

Patent

active

046752528

DESCRIPTION:

BRIEF SUMMARY
INDUSTRIAL FIELD UTILIZING THE INVENTION

The present invention relates to a base material such as glass and the like having a membrane dyed by an anionic dyestuff on the surface thereof, and a method for dyeing a membrane on the surface thereof.
In recent years, coloured base materials prepared by coloring various transparent base materials such as glass and the like have been used in various kinds of displays. Particularly, transparent, colored base materials prepared by coloring a transparent base material such as glass and the like are useful as color-resolving filters, and the demand therefor has been increased by the use for the liquid crystal color television set and the colorization of the cameras for color television set.
The present invention has been accomplished for fulfilling the demand and relates to a transparent base material such as glass and the like having a dyed membrane on the surface thereof and a method for dyeing a membrane on the surface of the base material.


CONVENTIONAL TECHNIQUES

Hitherto, in this technical field, a method for dyeing a membrane of natural high polymeric material of protein such as casein, gelatin and the like has mainly been used.
According to the method, an aqueous solution prepared by adding potassium bichromate or ammonium bichromate as a photo-curing agent into an aqueous solution of casein, gelatin and the like in warm water is spin-coated on one of the surfaces of a glass plate, then the thus coated glass plate was irradiated with an activating light via a mask, thereby forming a latent image of a dyeable layer on the glass plate, and after actualizing the dyeable layer by developing thereof, the thus actualized dyeable layer is dyed by a dyestuff.


PROBLEMS TO BE RESOLVED BY THE INVENTION

In practicing the method for dyeing by utilizing casein, gelatin and the like, the following various defects of the process have been experienced.
Casein, gelatin and the like are easily putrefied because they are natural products; their quality varies widely depending on the material source, thereby causing an extremely poor reproducibility of colours; since the membrane made of casein, gelatin and the like is easily exfoliated from the glass plate when immersed in hot water; and their physical properties are largely deteriorated thermally and the conditions for dyeing method are restricted.
In addition, there is a problem in the conventional method that deep colour hardly is obtained due to the limitation of the temperature of the dyebath in dyeing.
Further, there are problems due to the use of potassium bichromate or ammonium bichromate as a photo-curing agent in the case of utilizing casein, gelatin and the like, for instance, a problem of environmental pollution in the operational steps and in the case of waste-disposal and of a bad influence of the remaining chromium in gelatin of the product.
In order to resolve the above-mentioned problems, the present inventors have examined the synthetic high polymers for use in dyeing method. At first, the present inventors tried, after coating the surface of the base material with a polymer having group(s) which has an affinity for an anionic dyestuff or having quaternary ammonium salt group(s), to dye the membrane formed from the polymer on the surface of the base material.
In such a case, since the polymer itself has an affinity for an anionic dyestuff, the polymer is dyeable. However, since the polymer is soluble in water, the dried membrane on the base material, which has been prepared by coating the polymer on the surface of the base material such as glass and the like and drying the thus coated polymer, was exfoliated in the case of immersing the thus prepared base material in a dye bath for dyeing. Namely, it is not possible to dye the membrane on the surface of the base material nor to obtain a coloured base material.


MEANS FOR SOLVING THE PROBLEMS

As the results of the examination and studies of the present inventors for solving the above-mentioned problems, the present inventors have found that a base materi

REFERENCES:
patent: 3009017 (1961-11-01), Conner et al.
patent: 3763118 (1973-02-01), Ulrich et al.
Chemical Abstracts, vol. 98, 1983, p. 306.

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