JPS6317429A - Container for packing liquid crystal - Google Patents

Abstract

PURPOSE:To determine the adhesive strength only by the adhesive power of substrates and adhesive agent by putting a dielectric layer into a dissolved or mixed state and bringing the substrates into substantially direct contact with the adhesive agent in the adhering part of a container. CONSTITUTION:A 5% soln. prepd. by dissolving a random copolymer of VDF and TeFE (75%:25%) in a methyl ethyl ketone (MEK) is spin-coated and is formed to about 1,000Angstrom thickness on the substrate formed with electrodes 2 on the necessary part of a glass substrate 1. The solvent is removed in a vacuum dryer to form the dielectric layer 4. Another substrate 1' is subjected to the similar treatment. An outside peripheral sealing part is formed on one of such two substrates 1, 1' by a screen printing method using an epoxy adhesive agent, then the two substrates 1, 1' are fixed. The substrates are thereafter heat-treated to evaporate about 0.1-1% MEK added to the adhesive agents 7, 7' and to cure the adhesive agents. The glass and the epoxy resin are thus directly adhered only by the adhesive strength of both.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid crystal filling container in which a ferroelectric layer is provided on at least one of the substrates. Conventionally, in liquid crystal filling containers, such as cells of liquid crystal display devices, as shown in FIG. 2, a flat substrate (1) (1'), display electrodes (2) (2') on top, and an alignment film (3) (3')
The pair of substrates were fixed together with an adhesive (5) to form a container. In this case, the pair of substrates has a flat substrate (1)-alignment film (
3) - Adhesive (5) - Alignment film (3') - Flat substrate (1'
). In other words, the factors that determine the adhesive strength of this pair of substrates are: - The adhesion between the substrate (1) (1') and the alignment film (3) (3') - The alignment film (3) (3') and the adhesive (5) is the adhesive force. These conventional general containers have a certain track record and have not caused any major problems in use.

However, there is a liquid crystal filling container that uses a ferroelectric layer on the alignment film or in place of the alignment film. Examples of such ferroelectric materials include copolymers of vinylidene fluoride (hereinafter referred to as VDF) and ethylene trifluoride (hereinafter referred to as TrFE) or ethylene tetrafluoride (hereinafter referred to as TeFE), polyvinylidene fluoride, etc. is known, and is a so-called fluorine-containing polymer compound. In the case of liquid crystal containers in which these fluorine-containing polymer compounds are formed on the top surface of the alignment film or in place of the alignment film, the adhesion to the underlying material is weak, and the adhesive strength between the top surface of the ferroelectric layer and the adhesive is weak. Therefore, it is necessary to remove the ferroelectric layer only at the bonded portion.

The present invention solves these problems.

That is, when forming a liquid crystal filling container using such an organic ferroelectric material, it is necessary to use an adhesive containing a solvent that dissolves a polymer compound, or to use a solvent that dissolves a polymer compound. By adding it to an adhesive, a pair of substrates are bonded together, and essentially only the adhesive force between the substrates and the adhesive determines the adhesive strength. less than,
The present invention will be explained according to examples.

Example As shown in FIG. 1, VDF and Te
Random copolymer of FE (75χ:25χ) was methyl
The other substrate (1) was spin-coded with a 5χ solution dissolved in ethyl ketone (MEK), formed to a thickness of approximately 1000 mm, and the solvent was removed in a vacuum dryer to form a ferroelectric layer (4). ') was also subjected to the same treatment. Thereafter, in order to fix both substrates together, an outer peripheral seal portion was formed on one substrate (1) by screen printing using an epoxy adhesive. At this time, since the epoxy adhesive does not contain a solvent, the ME
K is added. After that, both bases were crimped to 80"
A heat treatment was performed at a temperature of C for about 30 minutes to harden the adhesive and form a liquid crystal filling container. At this time, the ferroelectric layer (
4) was dissolved or mixed with the solvent in the adhesive (5), and the substrate (1) (1') was in direct contact with and fixed to the adhesive (7) (7'). Adhesive strength is the tensile strength value of glass and epoxy resin (approximately 39Q kgcm-”)
The adhesive interface was essentially only the adhesive and the glass substrate.

In this example, MEK was added to the epoxy adhesive, but any material that can dissolve the polymer compound may be used.
It is not particularly limited. Furthermore, when using other types of adhesives, it is also possible to add a solvent or use a material containing a solvent.

Further, the container to which the present invention is applied is not limited to the embodiment shown in FIG. 1, and can be expected to have a wide range of applications.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of the present invention. FIG. 2 is a schematic diagram of a conventional example.

Claims (1)

[Claims] 1. In a liquid crystal filling container formed by bonding a pair of flat substrates, a ferroelectric layer is provided on at least one of the substrates, and the ferroelectric layer is provided at the bonded portion of the container. A liquid crystal filling container characterized in that the dielectric layer is in a melted or mixed state and the substrate and adhesive are substantially in direct contact with each other. 2. A liquid crystal filling container according to claim 1, wherein the ferroelectric layer is made of an organic material.