Liquid crystal sealing agent and liquid crystal display cell using the same

Abstract

Disclosed is a liquid crystal sealing agent which has an extremely low possibility of contaminating liquid crystals, while exhibiting excellent coating workability and bondability with a substrate. In addition, this liquid crystal sealing agent has long working life, long pot life, and high adhesion strength. Specifically disclosed is a liquid crystal sealing agent which is characterized by containing (a) a hydrazide compound having a isocyanuric ring structure represented by the general formula (1) below, and (b) one or more curable resins selected from epoxy resins, (meth)acrylated epoxy resins, and partially (meth)acrylated epoxy resins. (1) [In the formula, R1-R3 independently represent a hydrogen atom or a molecular skeleton represented by the following general formula (2): (2) (wherein n represents an integer of 1-6).

Description

technical field [0001] The present invention relates to a liquid crystal sealing agent and a liquid crystal display unit using the sealing agent. Particularly, the present invention relates to a liquid crystal sealing compound suitable for manufacturing a liquid crystal display unit by a liquid crystal dropping method, and a liquid crystal display unit manufactured using the liquid crystal sealing compound. Background of the invention [0002] In recent years, with the increase in size of liquid crystal display units, a so-called liquid crystal dropping process with higher productivity has been widely used as a method of manufacturing liquid crystal display units. In the liquid crystal dropping method, liquid crystal is dropped into a barrier wall of a liquid crystal sealant formed on a substrate, and then another substrate is laminated thereon to form a liquid crystal display unit in which liquid crystal is sealed. However, in the liquid crystal dropping method, since the ...

AI Technical Summary

Problems solved by technology

However, in the liquid crystal dropping method, since the uncured liquid crystal sealant is in direct contact with the liquid crystal, there is a problem that some components of the liquid crystal sealant are extracted into the liquid crystal, contaminating the display area of ​​the liquid crystal, thereby preventing improvement of the liquid crystal display. Unit reliability considerations require less polluting sealant

The cationic polymer liquid crystal sealant has the defect of poor reliability due to the cationic component produced by photocuring contaminating the liquid crystal and lowering the specific resistance of the liquid crystal

In addition, since the radical polymerization type liquid crystal sealant has a large cure shrinkage when it is photocured, it has a problem of insufficient adhesive strength

In addition, both cationic polymerization type and radical polymerization type photocuring methods have problems that the metal wiring portion of the liquid crystal display unit array substrate and the black matrix portion of the color filter substrate form a light shielding portion in the liquid crystal sealant where light cannot enter , so that the light shielding part does not cure

However, this patent document does not describe the storage stability, curing properties, etc. of the epoxy resin composition, nor does it describe the possibility of being used as a curing agent for a liquid crystal sealant

Patent Document 3 discloses that in the curing system of epoxy resin and hydrazide curing agent, polycarboxylic acid can be effectively used as a curing accelerator, but it does not describe the possibility of being applied to liquid crystal sealant

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