JPS5927965A - Clear film-forming paste and clear film therefrom - Google Patents

Abstract

PURPOSE:To provide a clear film-forming paste excellent in mass productivity, by incorporating an organocerium compd., an organozinc compd., a tackifier, and an org. solvent; as well as a clear film with good film performance, by applying said paste on substrates and baking it. CONSTITUTION:A clear film-forming paste is obtained by incorporating an organocerium compd. (e.g., cerium trisacetylacetonate), an organozinc compd., (e.g., zinc octoate), a tackifier (e.g., cellulose compd.), and an org. solvent dissolving said three components (e.g., butyl cellosolve). The total content of the organocerium compd. and the organozinc compd. in said paste is pref. 2-30wt%. By subjecting said paste to screen printing on substrates such as glass or ceramics and baking at a temp. of about 400 deg.C or higher, a clear film of cerium oxide/zinc oxide is formed into a desired pattern.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transparent metal oxide film formed on a substrate such as glass or ceramic, and more specifically to a transparent film made of cerium oxide-zinc oxide. .

Methods for forming a transparent metal oxide film made of cerium oxide-zinc oxide include a vacuum evaporation method, a chemical spray method, and a dipping method. By the way, although the vacuum evaporation method has excellent properties of the film formed, there are problems with f and J productivity.
Further, etching and other processing for the 7th part corresponding to the patterned G was tedious.

On the other hand, the chemical spray method and the dipping method are relatively suitable for mass production, and there are similar problems with patterning as with SF1. As described above, the conventional method is limited to GEL, and is not necessarily an excellent method.

The purpose of the present invention is to eliminate such drawbacks of the prior art,
It is an object of the present invention to provide a waveform for forming a transparent film that can be screen printed with excellent mass productivity and has good film characteristics, and a transparent film formed using the paste.

In order to achieve this object, the present invention provides an organic cerium compound and an organic zinc compound which are compounds that form a cerium oxide-zinc oxide film by firing and are soluble in organic solvents, a thickener, and these organic cerium compounds, This method is characterized by kneading an organic zinc compound and an organic solvent that dissolves a thickener to form a paste for forming a transparent film.

In order to achieve the above object, the present invention further provides an organic cerium compound and an organic zinc compound, which are compounds that form a cerium oxide-zinc oxide film by calcination Jv and are soluble in an organic solvent, a thickener, and a thickener. A paste obtained by kneading a cerium compound, an organic zinc compound, and an organic solvent that dissolves the thickener 2 is applied onto a substrate and fired to form a transparent film of cerium oxide and zinc oxide.

The organic cerium compound used in the present invention includes:
Cerium trisacetylacetonate is preferred.

Furthermore, the organozinc compound used in the present invention includes:
Zinc octylate is preferred.

As the thickener used in the present invention, cellulose compounds such as nitrocellulose and ethylcellulose are suitable.

Examples of organic solvents for dissolving thickeners such as cerium compounds and organic zinc compounds include high-boiling alcohols such as terpineol, 2-ethylhexanol, and benzyl alcohol, benzyl acetate, and dimethyl phthalate. High boiling point esters, high boiling point alcohol ethers such as calpitol, butyl calpitol, butyl cellosolve, etc. are used.

A paste is prepared by mixing an organic cerium compound, an organic zinc compound, a thickener, and an organic solvent in a predetermined ratio, and the paste is then patterned into a desired shape using a rough IJ-screen plate. Screen printing onto a substrate such as or ceramic. By pre-drying the powder and firing it at a temperature of about 400° C. or higher, a transparent film of cerium oxide-zinc oxide is formed in a desired pattern. This film is not only transparent, but also extremely strong and has relatively high insulation properties. Further, by appropriately controlling the total amount of the organic cerium compound and the organic zinc compound in the paste, a film of 30001 or less can be freely formed.

Next, examples of the present invention will be described.

Using trisacetylacetonate cerium 2 as an organic cerium compound and zinc octylate as an organic zinc compound, the mixing ratio of these organic compounds was determined. i: Pastes with the following compositions were prepared with various changes.

[Organic compound 315% by weight Zinc octylate 15×dTotal weight% (X-1
-Y=100) [Thickener 314% by weight Nitrocellulose 14% by weight [Organic solvent 3
71% by weight Butyl cellosolve 35.5% by weight Butylcarpitol 35.5% For comparison, a similar paste was prepared using cerium l-lyacetylacetonate and zinc octylate as organic compounds. Created.

Each of these -g-sts was made into 250 meshes with a resist thickness of 1
Printing is performed on a soda glass substrate using a screen plate made of 0 μm stainless steel net. and 15 (1℃
The samples were preliminarily smoked at 500° C. for 15 minutes, and then fired at 500° C. for 30 minutes to form transparent metal oxide films.

The results of examining the film characteristics of each transparent film are shown in Table G below. Note that in the table, ○ marks are judged to be good, Δ marks are judged to be slightly bad, and X marks are judged to be bad. The film strength was examined using a 4-inch test, and the light transmittance indicates the minimum light transmittance in the visible region.

Table As is clear from this table, the transparent metal oxide film formed using the paste containing an organic cerium compound and an organic zinc compound soluble in an organic solvent according to the present invention is Even if the film thickness is relatively thick, the wet lJS light transmittance in the visible region is high, and it also has high electrical insulation properties.In addition, the film using the first stroke of the present invention has good screen printability,
The printed surface is extremely rough.◇ As a result of examining the total content of organic cerium compounds and organic zinc compounds in the paste and the presence or absence of cracks in the formed coating, it was found that the total content was 3.
If it exceeds 0% by weight, cracks may occur. On the other hand, if the talk, I+/proprietary ratio is less than 2 layers, the amount is too small and it is almost impossible to form a film. Therefore, if the total content of organic cerium compounds and organic zinc compounds in the paste is controlled within the range of approximately 2 to 30M, the film thickness will be 50%.
A beautiful transparent metal oxide film of 0X to 3000X is formed.

The present invention has the above-mentioned structure, and if it is a paste for forming a transparent film that can be screen printed and is easy to pattern, it can transmit light even if the film thickness is relatively large. It is possible to form a transparent film with high efficiency and insulation properties.

Claims (1)

[Scope of Claims] (]) An organic cerium compound and an organic zinc compound which are compounds that form a cerium oxide-zinc oxide film by firing and are soluble in an organic solvent, a thickener, and the organic cerium compound and the organic zinc compound. A paste for forming a transparent film, characterized in that it consists of a compound and an organic solvent that dissolves a thickener. A paste for forming a transparent film, characterized in that it is cerium. (3) A paste for forming a transparent film, characterized in that in claim (1), the organic zinc compound is zinc chloride. (4) A paste for forming a transparent film as described in claim (1), wherein the thickener is a cellulose compound. (5) Claim (1) In the description, the paste for forming a transparent film is characterized in that the total content of the Sukuiso cerium compound and the organozinc compound in the paste is regulated to a range of about 2 to 30 parts. (6) Firing An organic cerium compound and an organic zinc compound that form a cerium oxide-zinc oxide film and are soluble in an organic solvent, a thickener, and an organic solvent that dissolves the organic cerium compound, the organic zinc compound, and the thickener. A transparent coating, characterized in that a coating of cerium oxide and zinc oxide is formed by applying a mixture of the above and the like on a substrate and firing the coating to form a coating of cerium oxide and zinc oxide. In the method, G in the coating of the organic cerium compound and the organic zinc compound is
4? The total content in the coke is regulated to a range of about 2 to 30 tons. Characteristic transparent film 0