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Alignment assistant, liquid crystal composition and liquid crystal display element

A technology of orientation and additives, applied in liquid crystal materials, instruments, chemical instruments and methods, etc., can solve the problems of easy precipitation and limitation of crystals, and achieve the effect of good orientation and excellent storage stability.

Pending Publication Date: 2021-04-30
DIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as disclosed in Patent Document 1, when only one kind of spontaneous alignment additive is used, the amount of the spontaneous alignment additive that can be mixed into the liquid crystal medium is limited
In addition, if the amount of the spontaneous alignment additive is increased, there is a problem that the crystals of the spontaneous alignment additive tend to precipitate when the liquid crystal medium is stored.

Method used

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  • Alignment assistant, liquid crystal composition and liquid crystal display element
  • Alignment assistant, liquid crystal composition and liquid crystal display element
  • Alignment assistant, liquid crystal composition and liquid crystal display element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0897] Alignment auxiliary agent (A) and alignment auxiliary agent (B) were mixed in LC-1 so that alignment auxiliary agent (A) became 0.3% by mass and alignment auxiliary agent (B) became 0.3% by mass, and heated and melted to prepare A liquid crystal composition is obtained.

Embodiment 2～14

[0898] (Examples 2-14, Comparative Examples 1-4)

[0899] A liquid crystal composition was obtained in the same manner as in Example 1, except that the types and addition amounts of the liquid crystal mixture, the alignment aid, and the polymerizable compound were changed as shown in Table 1.

[0900] 2. Evaluation

[0901] 2-1. Evaluation of Low Temperature Preservability

[0902] First, the liquid crystal composition was filtered using a membrane filter (manufactured by Agilent Technologies, PTFE filter: 13 mm in diameter, 0.2 μm in pore size), and left to stand under vacuum for 15 minutes to remove dissolved air.

[0903] Next, this was washed with acetone, weighed 0.5 g into a well-dried vial, and left to stand at -25° C. for 14 days.

[0904] Thereafter, the presence or absence of precipitation was observed visually, and judgment was made based on the evaluation criteria of the following four stages.

[0905] [evaluation criteria]

[0906] ⊚: Even after standing still f...

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Abstract

The present invention provides an alignment assistant which is capable of ensuring the storage stability of a liquid crystal composition, while being capable of having liquid crystal molecules spontaneously align. The present invention also provides: a liquid crystal composition which has excellent storage stability, and which enables the achievement of a liquid crystal display element wherein liquid crystal molecules are well aligned; and a liquid crystal display element which uses this liquid crystal composition. This alignment assistant makes liquid crystal molecules align spontaneously. This alignment assistant is characterized by containing a first compound that has a polar group and a second compound that is different from the first compound but has the same polar group.

Description

technical field [0001] The invention relates to an alignment aid, a liquid crystal composition and a liquid crystal display element. Background technique [0002] Conventionally, in VA-type liquid crystal displays, polyimide ( PI) film. However, forming a PI film requires a huge cost, and in recent years, a method for realizing alignment of liquid crystal molecules despite omitting the PI film has been studied (for example, see Patent Document 1). [0003] Patent Document 1 discloses a liquid crystal medium based on a mixture of polar compounds having negative dielectric anisotropy and containing a spontaneous alignment additive having a hydroxyl group. In addition, Patent Document 1 describes that this liquid crystal medium can be suitably used in a display not containing an alignment film. [0004] From the viewpoint of sufficiently aligning liquid crystal molecules, it is conceivable to increase the amount of the spontaneous alignment additive (orientation assistant) c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K19/38G02F1/1337C09K19/54C09K19/56
CPCC09K19/54C09K19/38G02F1/1337C09K19/56
Inventor 樱井宗矩间宫纯一木村正臣
Owner DIC CORP