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Liquid crystal light control element

A liquid crystal dimming and component technology, which is applied in optics, nonlinear optics, instruments, etc., can solve the problem of voltage retention characteristics being damaged, and achieve the effects of voltage retention reliability and excellent sealing tightness

Pending Publication Date: 2020-12-04
NISSAN CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In addition, the guest-host type liquid crystal using a dichroic dye has the technical problem that the voltage retention characteristic of the host liquid crystal material is greatly impaired due to the influence of the dichroic dye

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0207] The following examples are given to illustrate the present invention in more detail, but the explanation of the present invention is not limited to these examples. In addition, the meaning of the abbreviation etc. of the compound used below is as follows.

[0208] (tetracarboxylic dianhydride)

[0209] CA-1: 1,2,3,4-cyclobutanetetracarboxylic dianhydride

[0210] CA-2: Bicyclo[3.3.0]octane-2,4,6,8-tetracarboxylic dianhydride

[0211] (diamine compound)

[0212] DA-1: 3-aminobenzylamine

[0213] DA-2: N,N-Diallyl-2,4-diaminoaniline

[0214] DA-3: Diamine represented by the following formula DA-3

[0215] DA-4: 1,3-Diamino-4-{4-[trans-4-(trans-4-n-pentylcyclohexyl)cyclohexyl]phenoxy}benzene

[0216]

[0217] The structure of (B) component used in the Example and the comparative example is as follows.

[0218]

[0219] (Organic solvents)

[0220] GBL: γ-butyrolactone,

[0221] PGME: Propylene Glycol Monomethyl Ether

[0222] (Molecular Weight Determination)...

Synthetic example 1

[0254] Make the atmosphere in a 50mL (liter) four-necked flask with a stirring device nitrogen, measure DA-1 1.12g (9.20mmol) DA-2 1.87 (9.20mmol) and DA-4 2.00g (4.60mmol), add 39.5 g of NMP was stirred and dissolved while feeding nitrogen gas. While stirring the diamine solution, 2.88 g (11.5 mmol) of CA-2 was added, and after reacting at 60° C. for 3 hours, CA-1 (2.25 g, 10.8 mmol) and NMP (4.39 g) were added, and at 40 The reaction was carried out at °C for 6 hours to obtain a polyamic acid solution (PAA-1) having a resin solid content concentration of 20.0% by mass. The viscosity of this polyamic acid solution was 660.1 mPa·s. Mn of this polyamic acid was 12,426, and Mw was 41,548.

[0255]

[0256] Polyamic acids (PAA-2) to (PAA-5) were obtained by performing the same operation as in Synthesis Example 1 using the components shown in the following Table 1, respectively. The viscosity and molecular weight of the obtained polyamic-acid solution are shown in Table 1 bel...

Synthetic example 6

[0258] After adding NMP to the polyamic acid solution (2) (50.0 g) obtained in Synthesis Example 1 and diluting to 7.50% by mass, acetic anhydride (6.26 g) and pyridine (19.4 g) were added as an imidation catalyst, °C for 3 hours. This reaction solution was poured into methanol (556 ml), and the resulting precipitate was filtered off. This deposit was washed with methanol, and it dried under reduced pressure at 100 degreeC, and obtained the polyimide powder (PI-1). The imidization rate of this polyimide was 51%. Mn of this polyimide powder was 11,201, and Mw was 32,594.

[0259]

[0260] Polyimide powders (PI-2) to (PI-5) were obtained by performing the same operation as in Synthesis Example 6 using the components shown in the following Table 2, respectively.

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Abstract

The present invention provides: a reliable liquid crystal alignment film which exhibits excellent seal adhesion, while having a desired voltage holding ratio (VHR); a liquid crystal aligning agent which forms this liquid crystal alignment film; and a guest-host liquid crystal light control element which is provided with this liquid crystal alignment film. A guest-host liquid crystal light controlelement which is provided with a pair of substrates having transparent electrodes, and a liquid crystal layer that is held between the pair of substrates, said liquid crystal layer containing a host liquid crystal and a dichroic dye, and which is characterized in that: each of the substrates is composed of a transparent film material; a surface of each of the substrates, said surface being in contact with the liquid crystal layer, is provided with a liquid crystal alignment film; and the liquid crystal alignment film is obtained from a liquid crystal aligning agent that contains the component(A) and the component (B) described below. Component (A): an imidized polymer of a polyamic acid which is obtained from a tetracarboxylic acid dianhydride component and a diamine component that contains at least one diamine having a group represented by formula (N-1) (In the formula, R1 represents a hydrogen atom or a methyl group; R2 represents -CH2-, -O-, -O-CO- or a phenylene group; R3 represents a hydrogen atom, a linear hydrocarbon group having 1-12 carbon atoms, or a branched hydrocarbon group having 1-12 carbon atoms; R4 represents a hydrogen atom or a methyl group; and * represents a bonding hand.) Component (B): a compound having two or more epoxy groups.

Description

technical field [0001] The invention relates to a guest-host type liquid crystal dimming element using a film substrate and a liquid crystal alignment agent suitable for the liquid crystal dimming element. Background technique [0002] As an alternative to conventional curtains and blinds, many electric dimming devices have been proposed to variably control the amount of light transmission and visibility according to the degree of voltage applied from the outside, and liquid crystal dimming devices are one of them. [0003] In particular, it is well known that liquid crystal dimming elements using film substrates have the following advantages compared to liquid crystal dimming elements based on glass substrates: light weight, excellent degree of freedom in shape, and ability to be subsequently pasted on already installed window glass Wait. [0004] Various types of liquid crystal elements are known, one of which is to use a guest-host type liquid crystal mixed with a dichro...

Claims

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Application Information

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IPC IPC(8): G02F1/1337C08G73/12G02F1/13
CPCC08G73/12G02F1/1337G02F1/13
Inventor 铁谷尚士片山雅章南悟志后藤耕平
Owner NISSAN CHEM IND LTD
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