Coating liquids for forming conductive coatings

Details Coating liquids for forming conductive coatings Coating liquids for forming conductive coatings

1988-10-11

1992-01-07

Barr, Josephine

Compositions

Electrically conductive or emissive compositions

Metal compound containing

2525011, 252520, H01B 106

Patent

active

050789155

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

This invention relates to coating liquids for forming conductive coatings and more particularly to coating liquids capable of forming on substrates such as glass, plastics, etc. transparent conductive coatings excellent in scratch resistance as well as in adhesion to the substrates.
In other aspects, the invention relates to glass or plastic substrates provided on the surface thereof with transparent conductive-coatings formed by using the abovementioned coating liquids, and particularly to display devices having front panels provided on the surface thereof with said transparent conductive coatings.


BACKGROUND OF THE INVENTION

Since glass or plastics which are used as transparent substrates of varied types including face-plates for Cathode ray tube (CRT), liquid crystal display (LCD), etc. are insulating materials, the surface thereof is liable to static electrification and hence the substrate surface tends to attract dusts or the like. Furthermore, in electrodisplay devices such as LCD, etc., miss-performance is sometimes caused by the presence of static electricity. For solving such problems as referred to above, attempts have often been made to prevent such substrates as glass, plastics, etc. from their being electrostatically charged by virtue of imparting electrical conductivity to the surface thereof.
In order to impart electrical conductivity to substrates, metallic thin films or conductive inorganic oxide coatings are deposited on the surface of substrate by the vapor phase method such as CVD method, PVD method and vapor deposition method, etc. In an attempt to impart electrical conductivity to the substrate surface by the vapor phase method, however, there are such problems that vacuum deposition apparatuses are required therefor, and that a surface area or shape of the substrate on which a desired coating is formed is restricted by the size of said apparatuses to be employed.
In light of the above problems, a process for imparting electrical conductivity to substrates has been proposed, which process comprises coating the substrate on the surface thereof with conductive coating materials obtained by dispersing conductive substances in binder resins.
Where an attempt was made to form conductive coatings on substrates by using conductive coating materials obtained by dispersing conductive substances in binder resins such as acrylic resins, butyral resins, vinyl chloride/vinyl acetate copolymer resins, etc., however, there were such serious problems that the conductive coatings formed thereby are found poor in transparency, scratch resistance, solvent resistance or in adhesion to the substrates, though said conductive coatings are excellent sufficiently in electrical conductivity.
Under such circumstances, there has earnestly been desired an advent of coating liquids for forming conductive coatings which are excellent in scratch resistance, solvent resistance and in adhesion to substrates as well as transparency.
Apart from the purpose of forming conductive coatings on substrates, however, Japanese Patent L-O-P Publin. No. 100943/1982 discloses silicon oxide coatings containing 1-30 mol % of zirconium oxide with the view of protecting the substrate surface and inhibiting reflection therefrom. In this publication, it is stated that in the zirconium oxide-silicon oxide coatings there are used, as the zirconium compounds, zirconium chloride such as ZrCl.sub.2, ZrCl.sub.3 or ZrCl.sub.4 ; zirconium nitrate such as Zr(NO.sub.3).sub.4 . 5H.sub.2 O; zirconium alkoxides and zirconium diketonates.
However, when an attempt is made to form the zirconium oxide-silicon oxide coatings by using coating liquids containing zirconium chloride, zirconium nitrate, zirconium alkoxide or zirconium diketonate and silicon alkoxide, it has been found by the present inventors that there is such a serious problem that because of instability in water of zirconium chloride and zirconium nitrate, the coating liquids containing the same cannot be preserved over a long period of time and have a short potl

REFERENCES:
patent: 5009708 (1991-04-01), Grunwald et al.

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