JPS61159469A - Transparent insulating film-forming paste - Google Patents

Abstract

PURPOSE:To provide the title paste which gives a transparent insulating film having excellent transparency and film strength and high denseness with good productivity, by dissolving an organozironium compd. in an org. solvent and mixing a tackifier. CONSTITUTION:An organozirconium compd. of formula I or II wherein metallic Zr and an org. ligand are bonded to each other through an oxygen atom, which is stably dissolved in a high-boiling (180 deg.C or above) org. solvent and can be converted into an oxide at 500 deg.C or below, is dissolved in a high-boiling org. solvent such as high-boiling alcohol (e.g. benzyl alcohol) or high-boiling ester (e.g. Carbitol acetate). A cellulosic tackifier such as ethylcellulose or nitrocellu lose is kneaded with the mixture.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a transparent insulating coating for liquid crystal cells, etc., and in particular, a coating for preventing alkali ion elution from a lower substrate of a liquid crystal cell, an electrode layer formed on the substrate, and a liquid crystal layer. The present invention relates to a paste for forming a transparent insulating film for forming a transparent insulating film used as a separating insulating film, a liquid crystal alignment film in a TN type liquid crystal display device, etc.

Conventionally, this type of transparent insulating film is a film containing 5ty2 as a main component, and has been formed by a vacuum deposition method, a dipping method, or the like.

However, the vacuum deposition method has poor productivity and tends to require large equipment. In addition, the dipping method has the disadvantage that a film is formed in unnecessary locations and cannot be applied to miniaturization of patterns.

In order to eliminate these drawbacks, attempts have been made to print a paste into a desired shape onto a substrate using screen printing, and then bake it to form a transparent insulating film, but the formed film is brittle and Often porous, the properties of the coating itself were inferior to coatings formed by vacuum evaporation or immersion.

The present invention has been made for the purpose of solving the above-mentioned conventional drawbacks and providing a paste for forming a dense transparent insulating film with good transparency and high film strength.

The feature of the present invention is that metallic zir-nium and organic ligands are used as the main components of the paste for forming a transparent insulating film that is stronger and denser than the conventional transparent insulating film that is mainly composed of 5iOz. An organic zirconium (Zr) compound in which the two are bonded via oxygen is dissolved in an organic solvent, and a viscosity agent is further added and mixed. In order to be able to form a transparent insulating film by screen printing, the zirconium compound must be stably dissolved in a high boiling point (180°C or higher) organic solvent, and must be dissolved at a temperature of 500°C or lower. The zirconium compound that satisfies these conditions is Zr (
Organic zirconium compounds such as CsHyOt)IZr(CvHwCOt)+ are applicable. '7. r (Cs
Organic zirconium compounds such as HtOJ+ and Zr (CyHwCOx)4 are combined with high boiling point alcohols such as benzyl alcohol, cyfuropyrene glycol and 2-ethyl-hexyl alcohol, high boiling point esters such as benzyl acetate and carpitol acetate, and butyl cellosolve. A paste is prepared by adding a cellulose-based viscosity agent such as dissolved sase, ethyl cellulose, or nitrocellulose to a high-boiling organic solvent such as high-boiling ethers and kneading the mixture. The paste was printed on a substrate by screen printing and fired (hereinafter referred to as the margin).The resulting transparent insulating film containing ZrO2 as a main component was a dense film with good transparency and high film strength.

As explained above, the present invention has good productivity, and
It has the great advantage of being able to provide a dense transparent insulating film with good transparency and high film strength.

Hereinafter, the present invention will be explained in more detail based on examples.

Example I A paste having the following composition was prepared by selecting Zr (C, H15Co2) as the Zr compound, ethyl cellulose (high viscosity type) as the organic solvent and L[2-ethylhexanol, and the viscosity agent.

Zr (G, H, 5 (X) 2) 4s, Qwt% 2-1-chill\skin-tnor 81.0wt% ether cellulose xt, owt% Using this paste, step E'r50 mesh, resist thickness lOμ
Printed 1:p on a conventional plate, dried at 150°C with 15 molecules,
After baking at 0° C. for 30 minutes, a beautiful film with a thickness of 2000 A, good transparency, and high film strength was obtained.

Example 2 A paste having the following composition was prepared by selecting 7. r compound, Zr(C5H70□)4, butyl cellosolve as organic solvent, ethyl cellulose (-high viscosity type) f as viscosity agent.

Zr(C5H,O'2) 48.0 W t% butyl cellosolve si, owt% ethyl cellulose 11.0 Wt4 A film was formed in the same manner as in Example 1, and a similar film was obtained. The film obtained in Example 1.2 has an ability of 2 to horizontally align liquid crystal molecules.

Therefore, it can also be used as an alignment film.

Example 3 A paste 8 having the following composition was prepared by selecting the Zr compound Zr(C5H70□)4, benzyl acetate as the organic solvent, and nitrocellulose 80 seconds as the viscosity agent.Zr(C6H,C2)4 8.0wt% benzyl acetate 81. 0Wt Chi Nitro Seven Rerose 11.0 Wt The properties of the formed film are almost the same as in Example 1.2, but the film strength is the strongest.

Claims (1)

[Claims] A paste for forming a transparent insulating film obtained by dissolving an organic zirconium compound in which metallic zirconium and an organic ligand are bonded via oxygen in an organic solvent, and further adding and mixing a viscosity agent.