Stock material or miscellaneous articles – Composite – Of quartz or glass
Patent
1989-06-08
1991-05-07
Cashion, Jr., Merrell C.
Stock material or miscellaneous articles
Composite
Of quartz or glass
428447, 428428, 428429, 428432, 428470, 427123, 4271263, B32B 1706, B05D 512
Patent
active
050136070
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to transparent conductive ceramic-coated substrates and processes for preparing the same. In another aspect, the invention relates to uses of the transparent conductive ceramic-coated substrates.
BACKGROUND OF THE INVENTION
Because of their transparency, glass or plastic substrates are used for various purposes. However, these substrates are liable to generate static electricity on their surface, as they are insulators. When the glass or plastic substrates are used, as they are, as face-plates for displays such as cathode ray tube (CRT), fluorescence indication pipe (FIP), plasma display (PDP), liquid crystal display (LCD), etc., rubbish or dust attaches to the surface of face-plate and the images displayed are difficult to look at. Particularly, in the case of LCD, there is sometimes brought about destruction of IC or mismovement.
In a copy machine 1 equipped with an automatic document feeder (ADF) 2 as shown in FIG. 1, paper clogging is sometimes caused by static electricity generated on a platen glass 3 in the course of feeding documents, whereby continuous feeding of the documents can be made no longer.
In the case of plastic substrates, moreover, because of their low surface hardness, the plastic substrates readily receive scratches on their surface, whereby they sometimes decrease in transparency.
With the view of solving such problems as mentioned above, there is proposed a process for forming on the substrates a metallic coating or a conductive inorganic oxide coating by the vapor phase method such as CVD, PVD or vacuum deposition method. The coatings obtained by this process, however, are low in acid resistance and alkali resistance, though they are excellent in transparency and conductivity. Further, these coatings are liable to scratching, because they lack in scratch resistance. Furthermore, vacuum metallizers are needed for forming these coatings and, moreover, there is a limit to an area or shape of the substrate on which the coating can be formed by this apparatus. In the proposed process, the coatings cannot be formed at low temperatures, and a continuous productivity of this process is poor, because the process is carried out batchwise.
In the platen glass having an antistatic effect obtained by the process as mentioned above, the coatings formed on the platen glass was sometimes scraped off by the documents fed by ADF or a rubber belt fitted to ADF. In the platen glass as mentioned above, there was brought about such a new problem that the copying is carried out in higher copy sensitivity, that is, at a gray scale, the portion of the coating scraped off in the manner as mentioned above is printed as a stain on the copy as obtained.
There is also proposed a process for imparting conductivity to substrates by coating conductive paints having dispersed conductive substances in resins on the substrates. The coatings obtained by this process, however, involved such a problem that they are poor in transparency, alkali resistance, salt water resistance, water resistance, solvent resistance and scratch resistance, though they are excellent in conductivity.
The face-plates of displays, in their other aspect, are sometimes desired to have a regular reflection reducing effect (hereinafter called anti-glare), in addition to the antistatic effect, for inhibition of glaring of the plates. In order to impart anti-glare and antistatic effect to the face-plates of displays, the following processes are known. That is, Japanese Patent L-O-P Publn. No. 16452/1986 discloses a process which comprises preheating a face-plate composed of glass or plastics, spraying over said face-plate a colloidal solution of a silicic acid compound such as a partially hydrolyzed silicic ester or the like, a reactive silicon compound such as silicon tetrachloride or the like, or a solution obtained by mixing said colloidal solution with a water-soluble metallic compounds of such metal as platinum, gold, palladium or tin, and forming a finely uneven coating composed of silicon oxi
REFERENCES:
patent: 4568578 (1986-02-01), Arfsten et al.
patent: 4859499 (1989-08-01), Sauvinet et al.
patent: 4869948 (1989-09-01), Iida et al.
Abe Yoneji
Hirai Toshiharu
Komatsu Michio
Sato Goro
Senjyuu Noboru
Cashion Jr. Merrell C.
Catalysts & Chemicals Industries Co. Ltd.
Sumihiro Don
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