Novel thermal radical generator, method for producing same, liquid crystal sealing agent, and liquid crystal display unit

Abstract

Provided are a tetraphenylethane derivative represented by general formula (1), a method for producing the same, the use of the tetraphenylethane derivative as a radical generator, a liquid crystal sealing agent containing the tetraphenylethane derivative, and a thermosetting liquid crystal sealing agent for the one-drop fill process in particular. The radical generator does not foam and has excellent thermal radical generating performance, and, when used with a liquid crystal sealing agent, the resulting liquid crystal sealing agent does not contaminate liquid crystals, has a long pot life, and performs well in terms of forming a seal and forming a cell gap. (1) Y1 and Y2 in general formula (1) are each independently a hydrogen atom, phenyl, or silicon atom, R1 through R6 are each independently a hydrogen atom or C1-4 linear or branched alkyl group, and X1 through X4 are each independently a hydrogen atom, methyl group, ethyl group, methoxy group, ethoxy group, phenoxy group, or halogen group. R1 through R3 or R4 through R6 that bond with Y1 or Y2, respectively, are not present when Y1 or Y2 is a hydrogen atom, and Y1 and Y2 are not both hydrogen atoms.

Description

technical field [0001] The present invention relates to novel silyl benzopinacol, its use as a thermal radical generating agent, a liquid crystal sealing compound containing the novel silyl benzo pinacol, and a liquid crystal display unit using the liquid crystal sealing compound. Background technique [0002] Conventionally, azo compounds, organic peroxides, benzoins, and benzoin ethers are known and widely used as radical generators that cure by radically polymerizing radically polymerizable compounds by heating. , acetophenones, benzopinacols, etc. [0003] Azo compounds or organic peroxides that are most likely to generate free radicals through thermal cracking are used as free radical generators in products such as adhesives, sealants, gap forming agents, and molding materials. However, the above-mentioned radical generators are accompanied by the generation of gases such as nitrogen and carbon dioxide when generating radicals, so there is a possibility that these gase...

AI Technical Summary

Problems solved by technology

There is a problem that the uncured part is infiltrated by liquid crystal in the heat curing step, or liquid crystal contamination occurs

However, in the liquid crystal dropping method using this heat-curable liquid crystal sealing agent, it is difficult to sufficiently solve the problem that the liquid crystal leaks due to the bank rupture of the liquid crystal sealing agent during the curing process of lowering the viscosity by heating (the problem of seal bursting). ); and it is difficult to fully solve the following major problem: the composition of the liquid crystal sealing agent whose viscosity is reduced due to heating will also be higher than usual due to heating above the NI point (the temperature at which the isotropic phase changes to the liquid crystal phase) Dissolution in liquid crystals that are easy to flow, contaminating liquid crystals

[0020] In addition, the degradation of the liquid crystal seal under high-humidity conditions has become a problem in response to the demand for a longer life of the liquid crystal cell.

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