JPH02180845A - Polymer liquid crystalline compound, polymer liquid crystal composition and polymer liquid crystal element - Google Patents

Abstract

NEW MATERIAL:A polymer liquid crystal compound having a main chain comprising a repeating unit shown by formula I (A is tricyclic mesogen group; B is optical active group-containing spacer flexible group; X1 and X2 are group containing one of ester bond, ether bond and dimethylsiloxane bond; n is 5-1,000) and 5-1,000 polymerization degree. EXAMPLE:A polymer liquid crystalline compound having a repeating unit shown by formula II. USE:A ferroelectric polymer liquid crystal showing a chiral smectic phase (Sm* phase), capable of being readily formed into thin films and films. Further when a polymer liquid crystal composition containing the liquid crystal and low- molecular liquid crystal is applied to a liquid crystal element, enlargement in area can be readily effected and when an electric field is applied to the Sm* phase, an excellent switching effect is shown. PREPARATION:A compound shown by formula III (R1 and R2 are 1-15C alkyl) is subjected to ester interchange reaction with an optical active group-containing diol to give the above-mentioned liquid crystalline compound.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention relates to a novel liquid crystalline polymer compound having an optically active group in the polymer main chain, a liquid crystalline polymer composition containing the liquid crystalline polymer compound, and a liquid crystalline polymer composition containing the liquid crystalline polymer compound. The present invention relates to polymer liquid crystal devices using these materials.

[Prior Art] Recently, polymer liquid crystal materials have attracted attention as highly functional materials. The reason for this is said to be that polymer liquid crystals have the following excellent properties.

■It is easy to make thin films, making it possible to enlarge the area of liquid crystal elements, which is difficult to achieve with low-molecular liquid crystals.

(2) A good orientation state can be obtained by performing an orientation treatment such as stretching.

■Since the liquid crystal state of polymers can be maintained even below the glass transition point, memory storage stability is significantly improved compared to when using low-molecular liquid crystals.

However, it has been said that a problem in putting polymer liquid crystals into practical use is their slow response speed to electric fields. However, the response speed to the electric field is thought to be significantly improved by using a ferroelectric polymer liquid crystal that has spontaneous polarization similar to that of low-molecular liquid crystals.

In order to make a polymeric liquid crystal exhibit ferroelectricity, it is necessary to introduce an optically active group into the flexible spacer (bent type). It is already known that a polymer liquid crystal having a nematic phase can exhibit a cholesteric phase by replacing some of the carbons in the bends with asymmetric carbons. Here, the effect of replacing the asymmetric carbon is that only the temperature range in which the liquid crystal phase is formed is often changed without changing the type of liquid crystal phase that is developed. [D. Willen, El Liebert and El Strzelecki [European Polymer Journal 16a307 p. 198
Year 0J (D, V, Luyen, L, Lieb
eltand L, 5Lrzelecki, Eu
rop, Polym, J,, 16 3071980
] Therefore, it is considered possible to obtain a polymer liquid crystal having a chiral smectic phase by similarly replacing some of the bent carbons of a polymer liquid crystal having a smectic phase with asymmetric carbon.

Recently, as such a ferroelectric polymer liquid crystal, a main chain type polymer liquid crystal which uses a bicyclic biphenyl group as a mesogen and has an optically active group in the main chain has been reported. (“14th
Proceedings of the 2016 LCD Symposium, pp. 56-57, September 1988.
However, what is shown in this example is a monotropic polymeric liquid crystal that assumes a chiral smectic phase only when the temperature drops, making it difficult to develop a stable liquid crystal phase.

[Problems to be Solved by the Invention] The present inventors have discovered a novel ferroelectric liquid crystalline polymer compound and completed the present invention by conducting intensive research based on such conventional techniques.

The object of the present invention is to provide a novel liquid crystalline polymer compound that exhibits a chiral smectic phase (S1 phase) over a wide temperature range and that can be easily formed into a thin film, and a combination of the liquid crystalline polymer compound and a low molecular weight liquid crystal. An object of the present invention is to provide a polymer liquid crystal composition containing the following.

Another object of the present invention is to easily realize a large area by using the polymer liquid crystal compound and a polymer liquid crystal composition containing the polymer liquid crystal compound and a low molecular liquid crystal in an element. It is an object of the present invention to provide a polymer liquid crystal element that can be used as an element that can perform various electro-optic effects, exhibits stable and good switching effects, and can be used as an element that applies various electro-optic effects.

[Means for Solving the Problems] That is, the present invention provides a liquid crystalline polymer whose main chain is composed of repeating units represented by the following general formula (I) and whose degree of polymerization is from 5 to 1000. It is a compound.

General formula (1) discretionary -X, -A -X, -B - (wherein A is a tricyclic mesogen group to which at least two rings are bonded, B is a spacer flexible group containing an optically active group) , X, and x2 each represent a group containing any one of an ester bond, an ether bond, and a dimethylsiloxane bond, and may be the same or different. n represents 5 to 1000) and 5 In the invention, the main chain is connected between a pair of parallel electrodes.
6N, which is composed of a polymeric liquid crystalline compound that is composed of a reverse unit represented by a pattern hole (I) and has a degree of polymerization of 5 to 1000.
This is a polymer liquid crystal element characterized by having a film.

Furthermore, the present invention is characterized in that it contains a polymeric liquid crystalline compound whose main chain is composed of the repeating unit represented by the above-mentioned pattern (I) and whose degree of polymerization is 5 to 1000, and a low molecular weight liquid crystal. This is a polymer liquid crystal element characterized by having a polymer liquid crystal composition and an R film made of the polymer liquid crystal composition between a pair of parallel electrodes.

The present invention will be explained in detail below.

In the polymeric liquid crystalline compound of the present invention, the -monhole (I)
), A is at least 2
Referring to a tricyclic mesogen group in which two rings are bonded, specific examples thereof may be the same or different.

In the present invention, the polymeric liquid crystalline compound into which an ester bond having a repeating unit represented by the above-mentioned -monoya (I) is introduced can be synthesized, for example, by a conventional polycondensation reaction (1) or (2) as shown below. , Reaction (2) allows a high molecular weight product to be obtained relatively easily.

Reaction ■ A diester represented by the following general formula (■) and
o (g, ÷coo<3000-(E)-, etc.).

B represents a spacer flexible group containing an optically active group.

In addition, Xt8 and X2 each represent a group containing one of an ester bond, an ether bond, and a dimethylsiloxane bond, and x1 and x2 are (in the formula, R,, R2
is a branched or straight-chain alkyl group having 1 to 15 carbon atoms, each of which may be the same or different; A represents a tricyclic mesogenic group to which at least two rings are bonded); an optically active group; Synthesized by transesterification reaction with a diol containing To facilitate the reaction, for example, tetra-n-propyl ester of titanic acid.

It is preferable to add a known esterification reaction catalyst such as an organic titanium compound such as tetra-isopropyl ester or tetra-n-butyl ester, or an organic tin compound such as alkyltin or aryltin.

In the present invention, a tricyclic group in which at least two rings are bonded is selected as a mesogen group for the following reason. In other words, because the rigidity of the main chain of the resulting polymeric liquid crystalline compound increases, the liquid crystal phase is stabilized, the temperature range of the liquid crystal phase is widened, and the enantiomers take on a chiral smectic phase both when the temperature rises and when the temperature falls. This is because they tend to exhibit tropical properties.

Examples of diols containing optically active groups include compounds derived from optically active lactic acid, alkyl-substituted ethylene oxide, etc., or those obtained by condensation of these compounds with alkylene glycols and the like. The asymmetric carbon atoms of these optically active groups include fluorine atoms in addition to methyl groups.

Examples include those with a halogen element such as a chlorine atom or a bromine atom, or a substituent such as a methyl trifluoride group.

Reaction ■ Condensation reaction of an acid halogen compound represented by the following general formula (m) (wherein X is a halogen atom and A is the same as above) and a diol containing an optically active group by dehydrohalogenation. is synthesized by

The acid halide represented by the above general formula (m) can be obtained by halogenating the corresponding dicarboxylic acid with a halogenating agent such as thionyl chloride.

Next, in the general formula (I), the polymeric liquid crystal compound into which an ether bond has been introduced is, for example, a compound represented by the following general formula (17) and R300CA OH(ff) (wherein R3 is the number of carbon atoms Dehalogenation using a monoalcohol in which one hydroxyl group of a diol containing an optically active group (1 to 15 branched or straight-chain alkyl groups, A is the same as above) is substituted with a halogen atom such as chlorine or bromine It can be obtained by obtaining an intermediate with hydrogen and then performing a transesterification reaction.

In addition, by transesterifying the polymeric liquid crystal compound synthesized by the above reaction ① or ② with the monoester represented by the above general formula (rV) at an arbitrary ratio, the ether bond can be attached to one of the main chains. It is also possible to introduce it into the department.

In addition, in the general formula (I), the polymeric liquid crystalline compound into which a siloxane bond has been introduced may include, for example, a diol represented by the following general formula (V) (wherein p is an integer of 1 to 18,
(9 represents an integer from 1 to 10) and a diol containing an optically active group in a ratio that matches the desired physical properties,
It can be obtained by methods such as

The diol represented by the general formula (V) has an equivalent ratio of 2 or less, preferably 1 to the diol containing an optically active group.
It is preferable to use the following because a wide liquid crystal phase temperature range can be obtained and the response speed is fast.

Furthermore, a compound represented by the following general formula (VD, C1, ICI-R-Xi-A-X, -R''-CH-CH
□(VI) (wherein R, R'' is an alkyl group containing an optically active group on at least one side, X, X is a group containing either an ester bond or an ether bond, and each They may be the same or different.

) Dimethylsiloxane represented by the following general formula (■) (wherein r represents an integer from 1 to 10) (VI)/(■
) is combined at a ratio of 1, for example 0.5 to 2,
It can also be obtained by addition reaction in the presence of a platinum catalyst or the like.

Further, it is also preferable to use a combination of several kinds of A in the general formulas (III) and (N) in order to control temperature characteristics, optical characteristics, electrical characteristics, etc.

The polymeric liquid crystal compound obtained in this reaction is purified by a conventional method such as reprecipitation or filtration, and used as it is or after chromatographic purification if necessary.

The degree of polymerization of the liquid crystalline polymer compound of the present invention is from 5 to 1,000, and its weight average molecular weight (mw) is from 2,000 to 5,000.
00,000, preferably 5 to 100,000.

Specific examples of the polymeric liquid crystalline compound of the present invention having a repeating unit represented by the general formula (I) are listed below, but the present invention is not limited thereto.

Next, the polymer liquid crystal set 1 & product of the present invention consists of the above-mentioned polymer liquid crystal compound and low molecular liquid crystal, and the low molecular liquid crystal is particularly limited as long as it has good compatibility with the polymer liquid crystal compound. A wide range of known low molecular weight liquid crystals can be used without any problems.

Further, the low molecular liquid crystal may be used alone or in a mixture of two or more types.

Specific examples thereof include optically active low-molecular liquid crystals as shown in the following formulas (1) to (15), or formula (16).
Examples include non-optically active low-molecular liquid crystals as shown in (34).

(* indicates an asymmetric carbon atom) P-decyloxybenzylidene-P'-amino-2-methylbutylcinnamate (DOBAMBC) P-tetradecyloxybenzylidene-P'-amino-2-methylbutyl-α-cyanocinnamate Mate (G to TDOB 8MB)
P-hexyloxybenzylidene-P'-amino-2-chloropropylcinnamate (IIOBA(:PC)P
-cutyloxybenzylidene-P'-amino-2-methylbutyl-α-chlorocinnamate (OOBAMBC
C) P-decyloxybenzylidene-P'-amino-2-
Methylbutyl-α-cyanocinnamate (DOBAMB
CC) P-octyloxybenzylidene-P'-amino-2-methylbutyl-α-methylcinnamate (2-methylbutyl) esterbutyl) biphenyl-4'-carboxylatebutyl) biphenyl-4'-carboxylatebutyl) biphenyl- 4'-carboxylate Examples of liquid crystal compounds exhibiting non-chiral smectic hexyl) Biphenyl-4'-carboxylate 4'-n-nonyloxy-4-biphenylyl-4-cyanobenzoate etc. Auspicious phase → nematic → smectic C 4-n- Butylphenyl-4-(4'-nitrobenzoyloxy)benzoate (DB, NO□) etc. →
Nematic → Smectic A 4-n-octylphenyl-4-(4'-nitrobenzoyloxy)benzoate (DB, NO,) Isotropic phase → Nematic → Smectic A + Smectic C4-n-decylphenyl-4-(4'- nitropenzoyl)
Benzoate (DB+oNO2) 4-n-nonyloxyphenyl-4-(4'-nitropenzoyloxy)benzoate (DB9ONO□) Tokichi phase → Nematic Clasmectic A → Smectic C Tokichi phase ÷ Nematic → Smectic A → Smectic C Trans- 4-(4″-
octyloxybenzoyloxy)-4'-cyanostilbene (T8) 2-(4'-n-pentylphenyl)-
5-(4″-n-bentyloxyphenyl)pyrimidine etc. phase → nematic glass mectidzuku A.

→ Smectic A2 → Nematic phase → Smectic A → Smectic C → Smectic F → Smectic G CSHt l -@-N-CH+Cl1-N-(Φ
3H114-n-Pentylphenyl-4-(4'-cyanobenzoyloxy)benzoate (DB, 1CN) Terephthalylidene-bis-4-n-pentylaniline (T
[1PA) Tokichi phase → Nematic → Smectic A Tokichi phase ÷ Nematic class Mectic A → Smectic C
÷ Smectic F + Smectic G → Smectic HC
,H,+NfuC1(+CIIΦ(SawaCyaman-C,11
,O+CH-N+C,Il,,-nN-terephthalylidene-bis-4-n-butylaniline (TBBA) N-(4'-n-butyloxybenzylidene)-octylaniline (408) 4-n Isoyoshi phase → Nematic ÷ Smectic A + Smectic C
→ Smectic G + Smectic H Isotropic phase → Smectic A → Smectic Bc6 HI
to ()(toCN n-C5H,, o ()(toC5t(+ z-n4-cyano-4'-n-octyloxybiphenyl (80CB
) 4-n-hexyl-4'-n-hexyloxybiphenyl etc. auspicious phase ÷ smectic B + smectic E etc. auspicious phase → nematic → smectic A Ethyl-4-azobenzoate 4-n-hexyloxyphenyl-4'-n- Octyloxybiphenyl-4-carboxylate etc. Auspicious phase → Smectic A Isotropic phase → Nematic → Smectic A + Smectic C
÷ Smectic B Di-n-octyl-4,4'-terphenyl dicarboxylate, etc., etc., a lucky phase → Smectic A → Smectic C4-n-Hebutyloxyphenyl-4-n-decyloxybenzoate, etc., a lucky phase → Smectic A → Smectic Cn -hexyl-4'-n-pentyloxybiphenyl-4-benzoic acid lupoxylate (6508C) isokitic phase → smectic A → smectic B → smectic E 4-n-octyloxybenzoic acid isokitic phase → nematic → smectic C 4 -n-hexyl-4'-n-decyloxybiphenyl-4-carboxylate, etc. Phase → Smectic A → Smectic C A polymer liquid crystal composition containing a polymer liquid crystal compound as shown above and a low molecular liquid crystal The content of the polymeric liquid crystalline compound is desirably 5% by weight or more, preferably 10% by weight or more. If it is less than 5% by weight, the polymeric liquid crystalline compound will not react to pressure, heat stimulation, etc. Orientation stability caused by orientation is reduced. When used in the form of a film, the content of the polymeric liquid crystalline compound is preferably 30% by weight or more, preferably 50% by weight or more, from the viewpoint of shape retention.

Note that it is preferable to use a combination of a plurality of the above-mentioned polymeric liquid crystal compounds and low-molecular liquid crystals from the viewpoint of device design, and the temperature characteristics, optical characteristics, electrical characteristics, etc. can be controlled.

In addition, a dye, a light stabilizer, a light absorber, an antioxidant, a plasticizer, etc. can be added to the polymeric liquid crystal composition according to the present invention.

Next, in the polymer liquid crystal device of the present invention, a polymer whose main chain is composed of a repeating unit represented by the following general formula (I) and whose degree of polymerization is from 5 to 1000 is placed between a pair of parallel electrodes. A thin film made of a liquid crystal compound or a polymer liquid crystal composition containing the polymer liquid crystal compound and a low molecular liquid crystal is provided.

As a specific structure of the polymer liquid crystal element of the present invention, the polymer liquid crystal compound or polymer liquid crystal composition is formed into a film-like thin film from a molten state, and is placed between substrates provided with electrodes. Can be clamped and bonded. When gluing,
A suitable gap agent may be provided between the thin film of the polymer liquid crystal compound or polymer liquid crystal composition and the electrodes to maintain the insulation between the electrodes. Electrodes may be provided on the film of the polymeric liquid crystal composition. In this case, a film-like flexible polymer liquid crystal element can be obtained.

In addition, a thin film of a polymeric liquid crystal compound or polymeric liquid crystal composition is formed by dissolving the polymeric liquid crystalline compound or polymeric liquid crystal composition in a solvent (dichloroethane, THF, cyclohexanone, chloroform, etc.) in a molten state. It can also be formed by forming a film.

Specifically, as a method for producing a film-like thin film, a method for producing a normal plastic film, such as a melt extrusion method, a melt casting method, a calender method, or a spin cord method, can be applied.

According to the present invention, when forming a liquid crystal phase in a polymer liquid crystal element, the polymer liquid crystal compound or polymer liquid crystal composition is made into a film-like thin film, and further subjected to a stretching and alignment treatment, so that the liquid crystal molecules have a high Orientation can be given.

As a method of stretching and orientation treatment, -axis stretching method can be applied, or coating on a plastic substrate as a support.
Thin films of polymer liquid crystal compounds or polymer liquid crystal compositions may be laminated and the entire laminate may be stretched, or after forming a cell in which a liquid crystal film is sandwiched between two substrates,
It may be stretched or oriented.

Further, the polymer liquid crystal element of the present invention can also be used by sealing a polymer liquid crystal compound or a polymer liquid crystal compound in a molten state at a temperature equal to or higher than the isotonic phase transition temperature between a pair of substrates subjected to alignment treatment.

The orientation treatment for the substrate includes a uniaxial or biaxial orientation treatment performed on an organic thin film of polyimide, polyamide, polyvinyl alcohol, polysiloxane, polyimide amide, etc. by a rubbing method, and a 5in2. lnS, M
Uniaxial or biaxial alignment treatment can be applied to inorganic thin films such as gO by a rubbing method, SiO□, Sin, M
Applicable methods include methods using surfaces obtained by oblique vapor deposition of inorganic compounds such as gO and MgF2.

Furthermore, as long as it is held between a pair of substrates, good alignment can also be obtained by shearing by slightly shifting the upper and lower substrates.

[Example] Hereinafter, the present invention will be explained in more detail with reference to Examples.

Example 1 To 3.0 g of diethyl-4,4'-terphenyl dicarboxylate and 3.1 g of glycol represented by the following formula, CH3 HO-(-CI+, )y-0-CH-CIl□-O
Add 0,0015 g of H-tetra-isopropyl titanate O, heat to 200°C under a 7-gas atmosphere, liquefy the system, react by heating for 1 hour with stirring, and then repeat the same at 220°C for 1 hour. After the reaction, the temperature was raised to 250° C. over 1 hour, and after 1 hour of reaction, the pressure inside the reaction system was reduced to continue the reaction for an additional 5 hours, and the polymerization reaction was terminated at a degree of vacuum of 0.2 mmHg.

The polymer after the reaction was dissolved in chloroform and poured into 10 times the amount of methanol, and the resulting precipitate was filtered out and dried under reduced pressure to obtain 2.7 g of a milky white polymer (■). The molecular weight distribution of Polymer (1) was measured using GPC (gel permeation chromatography) in a THF solution, and the results were as follows.

Rn=1. OX104 Mw = 2.3
1.05, solvent: chloroform).

N to R data (δpp mark (TMS)) 1.20 (d
, :Hl, methyl) 3.70-3.85 (m,
148. methylene) 4.50 (layer, 6H, methylene) 7.65 (t, 8)1. Phenylene) 8.10
(d, 4H, phenylene) Example 2 The glycol of Example 1 was converted into a compound represented by the following formula (
3, :tg) in the same manner as in Example 1,
2.9 g of a milky white polymer (■) was obtained.

The results of measuring the molecular weight and specific optical rotation of Polymer (1) were as follows.

M, =1. :l XIO Rw = 3. OX 104 [α]2' = +7.0° (c = 0.94. Solvent: chloroform) NMR data (δpp■ (TMS) ) 1.20 (d, 6H, methyl) 3.75-3.85 ( I, 8B, methylene) 4
．． 50 (m, 8t-1, methylene) 7.70 (t
, 8H, phenylene) 8.10 (d, 4H, phenylene) Example 3 A compatibility test was conducted between the polymeric liquid crystalline compound obtained in Example 1 and the low molecular weight liquid crystal (14), and a wide composition range was found. It was confirmed that the phase was the same as that of the low molecular liquid crystal (14).

Table 1 shows the phase transition temperatures of various blended polymer liquid crystal compositions of (1) and (14).

Table 1 Example 4 The polymer liquid crystal composition shown in Example 3 (composition ratio of ■/(1,4) 1/4.I/1) was applied to a glass substrate 1, as shown in FIG. A solid ITO transparent electrode (thickness 1
A pair of glass substrates on which polyimide orientation @3,3', which has been rubbed to a thickness of 600 people, is formed, and an adhesive layer 4 is formed so that the thickness between the substrates is 109Li. The Tokichi phase was then sealed into a liquid crystal cell formed by bonding the two. When an electric field of 20 V/pm was applied to the Sac'' phase while observing it under a polarizing microscope, the inversion of the molecules in response to the electric field was measured.

The speed of the electric field response is shown in Table 2.

Furthermore, as shown in Fig. 2, when the liquid crystal cell 8 is sandwiched between two orthogonal polarizing plates 6 and 6' and an electric field is applied in the same manner as above, the brightness and darkness of the transmitted light can be observed in response to the electric field. It was done. 7
．． The arrow 7' indicates the polarization direction of the polarizing plate 6°6'.

Table 2 Table 3 Example 5 A compatibility test was conducted between the polymeric liquid crystal compound obtained in Example 2 and the low-molecular liquid crystal (31), and it was found that it was the same as the low-molecular liquid crystal (31) over a wide composition range. It was confirmed that it was a phase.

Table 3 shows the phase transition temperatures of various blended liquid crystal compositions of (1) and (31).

Example 6 The polymeric liquid crystal composition shown in Example 5 (composition ratio of ■/(31) 1/4.1/1) was filled in the same liquid crystal cell as in Example 4 starting from the tokichi phase. When an electric field of 20 V/μ threshold was applied to the 5taC'' phase, inversion of molecules in response to the electric field was observed. The speed of the electric field response is shown in Table 4.

Table 4 Example 7 Polymer liquid crystal compound of Example 6 /Low molecular liquid crystal (31)
20w% of dichloroethane composition in 1/1 ratio of
A solution was prepared and cast onto a glass plate with Teflon tape to form a film with a thickness of 30 JLm. When this film was stretched in one machine to 200% in an atmosphere at a temperature of 130°C, a uniaxially oriented film with a thickness of 12 ILm was obtained.

When this stretched film was sandwiched between glass substrates provided with ITO substrates and an electric field was applied in the same manner as in Example 6, inversion of molecules in response to the electric field was observed.

Example 8 By using the polymeric liquid crystal compounds ① and ② obtained in Examples 13 and 2, a thickness of 10I was prepared in the same manner as in Example 7, respectively.
A uniaxially oriented film of L■ was obtained.

When this stretched film was sandwiched between glass substrates provided with ITO electrodes and an electric field of 30 V/IL11 was applied in the same manner as in Example 6, inversion of molecules in response to the electric field was observed.

[Effects of the Invention] As explained above, the present invention provides a novel polymeric liquid crystalline compound that exhibits a chiral smectic phase (Ss'' phase) over a wide temperature range and is easy to form into a thin film. A polymer liquid crystal composition containing a polymer liquid crystal compound and a low molecular liquid crystal can be easily obtained.

In addition, by applying these polymeric liquid crystal compounds and polymeric liquid crystal compositions to liquid crystal devices, large-scale refinement can be easily achieved, and by applying an electric field to the S phase, stable It is possible to obtain a polymer liquid crystal element that exhibits a good switching effect and can be used as an element applying various electro-optic effects.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a liquid crystal cell used in Example 4, and FIG. 2 is a perspective view showing a liquid crystal cell with a polarizing plate used in Example 4. 1.1'--Substrate 2,2'--Transparent electrode 3.
3'... Alignment film 4... Adhesive layer 5... Polymer liquid crystal layer 6, 6'... Polarizing plate 7.7'... Polarization direction 8... Liquid crystal cell Figure 1, Figure 2 figure

Claims (4)

[Claims] (1) A polymeric liquid crystalline compound whose main chain consists of repeating units represented by the following general formula (I) and whose degree of polymerization is from 5 to 1,000. General formula (I) ▲Mathematical formulas, chemical formulas, tables, etc.▼ (In the formula, A represents a tricyclic mesogen group in which at least two rings are bonded, B represents a spacer flexible group containing an optically active group, X_1 and X_2 each represent a group containing any one of an ester bond, an ether bond, and a dimethylsiloxane bond, and may be the same or different. n represents 5 to 1000) (2) Between a pair of parallel electrodes, the main chain is formed by the following general formula (
It consists of repeating units represented by I) and has a degree of polymerization of 5 to 5.
1. A polymer liquid crystal element comprising a thin film made of a polymer liquid crystal compound having a molecular weight of 1,000. General formula (I) ▲Mathematical formulas, chemical formulas, tables, etc.▼ (In the formula, A represents a tricyclic mesogen group in which at least two rings are bonded, B represents a spacer flexible group containing an optically active group, X_1 and X_2 each represent a group containing any one of an ester bond, an ether bond, and a dimethylsiloxane bond, and may be the same or different. n represents 5 to 1000) (3) A polymer liquid crystal characterized by containing a polymer liquid crystal compound whose main chain is composed of a repeating unit represented by the following general formula (I) and a polymerization degree of 5 to 1000 and a low molecular liquid crystal. Composition. General formula (I) ▲Mathematical formulas, chemical formulas, tables, etc.▼ (In the formula, A represents a tricyclic mesogen group in which at least two rings are bonded, B represents a spacer flexible group containing an optically active group, X_1 and X_2 each represent a group containing any one of an ester bond, an ether bond, and a dimethylsiloxane bond, and may be the same or different. n represents 5 to 1000) (4) Between a pair of parallel electrodes, the main chain is formed by the following general formula (
It consists of repeating units represented by I) and has a degree of polymerization of 5 to 5.
1. A polymer liquid crystal element comprising a thin film made of a polymer liquid crystal composition containing a polymer liquid crystal compound having a molecular weight of 1000 and a low molecular weight liquid crystal. General formula (I) ▲Mathematical formulas, chemical formulas, tables, etc.▼ (In the formula, A represents a tricyclic mesogen group in which at least two rings are bonded, B represents a spacer flexible group containing an optically active group, X_1 and X_2 each represent a group containing any one of an ester bond, an ether bond, and a dimethylsiloxane bond, and may be the same or different. n represents 5 to 1000)