TWI669344B - Liquid crystal alignment agent, liquid crystal alignment film, and liquid crystal display element - Google Patents

Abstract

The present invention provides a liquid crystal alignment agent capable of suppressing an afterimage caused by an AC drive, and which can form a liquid crystal alignment film having an excellent sealant and adhesion to an underlying substrate, and a liquid crystal alignment film formed by the liquid crystal alignment agent And a liquid crystal display element having the liquid crystal alignment film.

A liquid crystal alignment agent containing the following (A) component and (B) component.

(A) Component: a polymer containing at least one selected from the group consisting of a polyimine precursor having a protecting group substituted with a hydrogen atom via heat and a polyimine.

(B) Component: a polymer containing at least any one selected from the group consisting of a ureido group and/or a thiourea group-containing polyimine precursor and a polyimide.

Description

Liquid crystal alignment agent, liquid crystal alignment film, and liquid crystal display element

The present invention relates to a liquid crystal alignment agent, a liquid crystal alignment film obtained by the liquid crystal alignment agent, and a liquid crystal display element using the liquid crystal alignment film.

A liquid crystal display element used in a liquid crystal television, a liquid crystal display or the like is usually provided with a liquid crystal alignment film for controlling a liquid crystal alignment (also referred to as alignment) in the element.

Nowadays, the most popular liquid crystal alignment film in the industry is generally a resin formed of a polyimide precursor formed on an electrode substrate, such as polylysine, or a polyimine obtained by hydrazine imidization. The surface of the film is obtained by rubbing in a direction using a cloth such as cotton, nylon, or polyester, that is, a so-called rubbing treatment method.

In the step of controlling the alignment state of the liquid crystal alignment film (also referred to as liquid crystal alignment treatment), the method of rubbing the surface of the resin film is industrially useful because it is simple and has excellent productivity. However, as the requirements for high performance, high definition, and large size of liquid crystal display elements are increasing, liquid crystal alignment film sheets are generated accompanying the rubbing treatment. Various effects such as flaws, dust, mechanical force or static electricity, and even in-plane unevenness of the alignment treatment will become increasingly clear.

Instead of the method of rubbing treatment, it is known, for example, via irradiation The method of polarizing ultraviolet rays to control the alignment of the alignment state of the liquid crystal. In the liquid crystal alignment treatment method using the photo-alignment treatment, proposals have been made for the use of a photo-analytical reaction, a photo-crosslinking reaction, and even a photo-decomposition reaction (for example, as shown in Non-Patent Document 1).

Further, in Patent Document 1, it has been proposed to use a photo-alignment treatment of a resin film formed of a polyimide-based resin having an alicyclic structure such as a cyclobutane ring. In particular, when a polyimine-based resin is used as a liquid crystal alignment film in a photo-alignment method, its practicality is expected as compared with other resin products because of its higher heat resistance.

In the above optical alignment process, there is no need to rub the liquid crystal alignment It has the advantages of being industrially easy to manufacture and manufacturing. Further, in the liquid crystal display device of the IPS (In-Plane Switching) driving method or the FFS (Fringe Field Switching) driving method, the liquid crystal alignment film obtained by the above-described photoalignment treatment is used in comparison with the liquid crystal alignment film obtained by the rubbing treatment method. It is expected that the contrast of the liquid crystal display element or the improvement of the viewing angle characteristics can be improved, and the performance of the liquid crystal display element can be improved. Therefore, the optical alignment treatment method is particularly attracting attention in the future liquid crystal alignment processing method.

On the other hand, the IPS drive mode or the FFS drive mode A liquid crystal alignment film used for a crystal display element has excellent liquid crystal alignment (also referred to as liquid crystal alignment or liquid crystal alignment) or electrical properties. In addition to this characteristic, it is necessary to have a residual image due to AC driving occurring in a liquid crystal display device capable of suppressing an IPS driving method or an FFS driving method, and to prematurely alleviate the residual electric charge accumulated by the DC voltage. However, the liquid crystal alignment film obtained by the photo-alignment treatment method has insufficient electrical properties in liquid crystal alignment or as a liquid crystal display element, and even the stability of the characteristics is not sufficient, and it is not easy to satisfy the above-mentioned desired characteristics.

In addition, in recent years, due to the thinness and display of liquid crystal displays In view of factors such as the expansion of the area, research has begun on how to narrow the marginal area on the substrate. In the narrow-edge LCD panel, since the liquid crystal alignment film is coated with a sealant for bonding, the liquid crystal alignment film has a great problem of insufficient bonding strength to the sealant and the underlying substrate. In general, it is known that the bonding strength (also referred to as adhesion) of the organic film-sealant and the organic film-substrate substrate tends to be weaker than the adhesion strength of the interface between the underlying substrate and the encapsulant. For a narrow-edge LCD panel, it is necessary to increase the adhesion strength of the liquid crystal alignment film-sealant and the liquid crystal alignment film-substrate.

However, at present, there is almost no research on the adhesion strength of the liquid crystal alignment film-sealant, and in particular, for the sealant, it is known that there is no improvement in adhesion to the liquid crystal alignment film, and both can suppress the liquid crystal display element. A study report of the above-mentioned afterimage or the premature retention of residual charge.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. Hei 9-297313

[Non-patent literature]

[Non-Patent Document 1] "Liquid Crystal Light Alignment Film", Miki-shi, Shimura, Functional Materials, November 1997, Vol.17, No.11, 13-22

The inventors of the present invention have focused on a method of producing a liquid crystal alignment film which is caused by an AC drive and which is caused by an AC drive in an IPS drive mode or an FFS drive mode, and which has a high adhesion to a sealant. A liquid crystal containing a component having excellent liquid crystal alignment property, high liquid crystal alignment resistance (hereinafter, also referred to as liquid crystal alignment component) and a component having excellent sealant and underlying substrate adhesion (hereinafter, adhesive composition) Research on alignment agents. However, in the liquid crystal alignment agent, particularly in the photoalignment treatment method, the above problems are not solved.

In other words, since the liquid crystal alignment film obtained from the liquid crystal alignment agent containing the above two components has an adhesive component, the sealant and the adhesion to the underlying substrate can be improved, but the alignment resistance of the liquid crystal is hindered. After the AC drive, the afterimage phenomenon occurs, and it is impossible to achieve the effect of having two characteristics.

The present invention provides a liquid crystal alignment agent obtained by blending liquid crystal alignment, that is, a liquid crystal alignment component having a strong liquid crystal alignment restricting force, and a sealant and an adhesive composition having excellent adhesion to an underlying substrate. It is intended to suppress a residual image caused by an AC drive, and has a liquid crystal alignment film having a sealant and adhesion to the underlying substrate.

Further, a liquid crystal display element having the above liquid crystal alignment film and a liquid crystal alignment agent which can provide the above liquid crystal alignment film are provided.

The inventors of the present invention have found that a liquid crystal alignment agent having a polymer having a specific structure is extremely effective in achieving the above object, and thus completed the present invention.

That is, the present invention is the one having the following main contents.

(1) A liquid crystal alignment agent comprising the following (A) component and (B) component, (A) component: polymerization of at least any one selected from the group consisting of a polyimide and a polyimide. (also referred to as a specific polymer (A)); the aforementioned polyimine precursor and polyimine have the following formula [1A] (also referred to as specific structure (1A)) and formula [1B] (also a structure selected as at least one selected from the structures shown by the specific structure (1B); (B) a composition: a polyfluorene having a structure represented by the following formula [2] (also referred to as a specific structure (2)) A polymer of at least one selected from the group consisting of an amine precursor and a polyimine (also referred to as a specific polymer (B)).

(In the formula [1A] and the formula [1B], X ^A and X ^C each independently represent a protecting group substituted with a hydrogen atom via heat, and in the formula [1B], X ^B represents a single bond or a carbon number of 1 to 40. The organic group, in which case, the atom to which the ester group (-COO- group) is bonded is a carbon atom).

(In the formula [2], Y ¹ and Y ⁷ each independently represent a single bond, an alkyl group having 1 to 10 carbon atoms, -O-, -N(R ¹ )-, -CON(R ² )-, - At least one selected from the group consisting of N(R ³ )CO-, -CH ₂ O-, -COO- and OCO-. However, R ¹ , R ² and R ³ each independently represent a hydrogen atom or an alkyl group having 1 to 3 carbon atoms. Y ² and Y ⁶ each independently represent an alkylene group having 1 to 10 carbon atoms, and Y ³ and Y ⁵ each independently represent a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, and Y ⁴ represents an oxygen atom or a sulfur atom).

(2) The liquid crystal alignment agent of the above formula (1), wherein the structure represented by the above formula [1A] and the formula [1B] is a structure represented by the following formula [1a], formula [1b] and formula [1c]. At least one of the selected structures,

(In the formula [1a], X ^a represents a hydrogen atom or an organic group having 1 to 20 carbon atoms, X ^b represents a protective group substituted by a hydrogen atom via heat, and m represents an integer of 1 or 2, and in this case, In the case where m in the 1a] is 2, X ^a does not have a substituent. In the formula [1b], X ^c represents a protecting group substituted by a hydrogen atom via heat, and in the formula [1c], X ^d represents a single bond or The organic group having 1 to 20 carbon atoms, X ^e represents a hydrogen atom or an organic group having 1 to 20 carbon atoms, X ^f represents a protecting group substituted by a hydrogen atom via heat, and n represents an integer of 1 to 4).

(3) The liquid crystal alignment agent according to (2) above, which Wherein the polymer of the component (A) is at least one selected from the group consisting of a polyimide precursor and a polyimine, and the polyimine precursor and the polyimine have the formula [1a] And a diamine component of a diamine having at least one structure selected from the structures represented by the formula [1b] and the formula [1c].

(4) The liquid crystal alignment agent according to the above (3), wherein the diamine is a diamine represented by the following formula [1-1]. (In the formula [1-1], X ^D represents an organic group having 5 to 50 carbon atoms having a structure selected from the structures represented by the above formulas [1a], [1b] and [1c], A ¹ and A ² each independently represent a hydrogen atom or an alkyl group having 1 to 5 carbon atoms.

(5) The liquid crystal alignment agent according to the above (4), wherein the diamine is at least one selected from the diamines represented by the following formula [1a-1] to the formula [1c-1].

(In the formula [1a-1], X ¹ represents a single bond, an alkyl group having 1 to 10 carbon atoms, -O-, -N(R ¹ )-, -CON(R ² )-, -N(R). ³ ) at least one organic group selected from CO-, -CH ₂ O-, -COO- and OCO-; however, R ¹ , R ² and R ³ each independently represent a hydrogen atom or an alkyl group having 1 to 3 carbon atoms; X ² represents a single bond, an alkylene group having 1 to 10 carbon atoms, X ^a represents a hydrogen atom or an organic group having 1 to 20 carbon atoms, and X ^b represents a protecting group substituted by a hydrogen atom via heat. An integer of 1 or 2, in which case, when m is 2, X ^a is a hydrogen atom, p represents an integer of 1 to 4, and q represents an integer of 1 to 4.

In the formula [1b-1], X ³ and X ⁷ each independently represent a single bond, an alkylene group having 1 to 10 carbon atoms, -O-, -N(R ¹ )-, -CON(R ² )-, At least one organic group selected from -N(R ³ )CO-, -CH ₂ O-, -COO-, and OCO-. However, R ¹ , R ² and R ³ each independently represent a hydrogen atom or an alkyl group having 1 to 3 carbon atoms. X ⁴ and X ⁶ each independently represent a single bond or an alkylene group having 1 to 10 carbon atoms, X ⁵ represents a single bond or an alkylene group having 1 to 10 carbon atoms, and X ^c represents a protection by a hydrogen atom. Base, r represents an integer from 1 to 4.

In the formula [1c-1], X ⁸ represents a single bond, an alkyl group having 1 to 10 carbon atoms, -O-, -N(R ¹ )-, -CON(R ² )-, -N(R ^{3 )} At least one organic group selected from CO-, -CH ₂ O-, -COO-, and OCO-. However, R ¹ , R ² and R ³ each independently represent a hydrogen atom or an alkyl group having 1 to 3 carbon atoms. X ⁹ represents a single bond, an alkylene group having 1 to 10 carbon atoms, X ^d represents a single bond or an organic group having 1 to 20 carbon atoms, and X ^e represents a hydrogen atom or an organic group having 1 to 20 carbon atoms, and X ^f represents via a protecting group which is substituted by a hydrogen atom, n represents an integer of 1 to 4, s represents an integer of 1 to 4, and t represents an integer of 1 to 4, in the formula [1a-1] to the formula [1c-1], A ¹ to A ⁶ each independently represent a hydrogen atom or an alkyl group having 1 to 5 carbon atoms.

(6) The liquid crystal alignment agent according to the above (5), wherein the diamine is at least one selected from the group consisting of diamines represented by the following formula [1d-1] to formula [1d-5],

(In the formula [1d-1] to the formula [1d-5], R ¹ to R ⁷ each independently represent at least one selected from the structures represented by the following formulas [a-1] to [a-6]. In the formula [1d-1] to the formula [1d-5], A ¹ to A ¹⁰ each independently represent a hydrogen atom or an alkyl group having 1 to 5 carbon atoms.

(In the formula [a-2], R ¹ represents an alkylene group having 1 to 5 carbon atoms).

The liquid crystal alignment agent according to any one of the above (1), wherein the polymer of the component (B) contains a polyimine precursor and a polyimine. The polymer of at least one of the above, the polyimine precursor and the polyimine are obtained by using a diamine component containing a diamine having a structure represented by the above formula [2].

(8) The liquid crystal alignment agent according to the above (7), wherein the diamine is a diamine represented by the following formula [2-1].

(In the formula [2-1], Y ^A represents an organic group having a carbon number of 10 to 50 having a structure represented by the above formula [2], and each of A ¹ and A ² independently represents a hydrogen atom or an alkyl group having 1 to 5 carbon atoms. ).

(9) The liquid crystal alignment agent according to the above (8), wherein the diamine is a diamine represented by the following formula [2a].

(In the formula [2a], Y ¹ and Y ⁷ each independently represent a single bond, an alkyl group having 1 to 10 carbon atoms, -O-, -N(R ¹ )-, -CON(R ² )-, - At least one selected from the group consisting of N(R ³ )CO-, -CH ₂ O-, -COO- and OCO-. However, R ¹ , R ² and R ³ each independently represent a hydrogen atom or an alkyl group having 1 to 3 carbon atoms. Y ² and Y ⁶ each independently represent an alkylene group having 1 to 10 carbon atoms, and Y ³ and Y ⁵ each independently represent a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, and Y ⁴ represents an oxygen atom or a sulfur atom, A ¹ and A ² each independently represent a hydrogen atom or an alkyl group having 1 to 5 carbon atoms).

(10) The liquid crystal alignment agent according to the above (9), wherein the diamine is at least one selected from the group consisting of the following formula [2a-1] to the formula [2a-3].

(In the formula [2a-1] to the formula [2a-3], A ¹ to A ⁶ each independently represent a hydrogen atom or an alkyl group having 1 to 5 carbon atoms).

The liquid crystal alignment agent of any one of the above (1), wherein the polymer of the component (A) contains a diamine represented by the following formula [3-1] A polymer obtained by using at least one selected from the group consisting of a polyimine precursor and a polyimine.

(In the formula [3-1], X ^E represents a structure selected from at least one of the structures represented by the following formula [3a-1] to the formula [3a-9], and each of A ¹ and A ² independently represents a hydrogen atom. Or an alkyl group having 1 to 5 carbon atoms).

(in the formula [3a-9], n represents an integer of 1 to 5).

(12) The liquid crystal alignment agent according to any one of the above (1), wherein the polymer of the component (A) and the polymer of the component (B) are the following formula [4] And a polymer obtained from the polycarboxylic acid imide of the tetracarboxylic acid component and at least one selected from the group consisting of polyimine.

(In the formula [4], Z represents a structure of at least one selected from the following formulas [4a] to [4q]).

(In the formula [4a], Z ¹ to Z ⁴ each independently represent a hydrogen atom, a methyl group, an ethyl group, a propyl group, a chlorine atom or a benzene ring. In the formula [4g], Z ⁵ and Z ⁶ each independently represent a hydrogen atom or methyl).

(13) The liquid crystal alignment agent according to the above (12), wherein the tetracarboxylic acid component is represented by the formula [4a], the formula [4e] to the formula [4g], and the formula Z in the formula [4]. a tetracarboxylic acid component having at least one structure selected from the structures shown in [4l], formula [4m] or formula [4p].

(14) As described in any of the above (5) to (13) The liquid crystal alignment agent in which the diamine represented by the above formula [1a-1], the formula [1b-1] and the formula [1c-1] in the polymer of the component (A) is in the total diamine component 100. In the % of moles, it is 5 to 30% by mole.

(15) The liquid crystal alignment agent according to any one of the above (9), wherein the diamine represented by the formula [2a] is a diamine component in the polymer of the component (B). Among 100% of the moles, it is 20 to 100% by mole.

The liquid crystal alignment agent according to any one of the above (1), wherein the polymer of the component (B) is relative to the aforementioned (A) The polymer of the component is 100 parts by mass, and is 40 to 250 parts by mass.

The liquid crystal alignment agent according to any one of the above (1), wherein the polymer of at least one of the components (A) and (B) is a polyfluorene. Alkylamine.

(18) As described in any of the above (1) to (17) The liquid crystal alignment agent, wherein the solvent of the liquid crystal alignment agent is at least one selected from the group consisting of N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone and γ-butyrolactone Solvent.

The liquid crystal alignment agent of any one of the above-mentioned (1) to (18), wherein the solvent of the liquid crystal alignment agent contains 1-hexanol, cyclohexanol, 1,2-ethane At least one solvent selected from the group consisting of alcohol, 1,2-propanediol, propylene glycol monobutyl ether, ethylene glycol monobutyl ether, and dipropylene glycol dimethyl ether.

The liquid crystal alignment agent according to any one of the above-mentioned (1), wherein the liquid crystal alignment agent contains an epoxy group, an isocyanate group, an oxycyclobutane group or a cyclic carbonate group. a crosslinkable compound, a crosslinkable compound having at least one substituent selected from a group consisting of a hydroxyl group, a hydroxyalkyl group or a lower alkoxyalkyl group, and a crosslinker having a polymerizable unsaturated bond A crosslinkable compound selected from at least one of the compounds.

(21) A liquid crystal alignment film obtained by the liquid crystal alignment agent according to any one of the above (1) to (20).

(22) A liquid crystal alignment film obtained by the inkjet method using the liquid crystal alignment agent described in any one of the above (1) to (20) By.

(23) A liquid crystal alignment film obtained by irradiating the liquid crystal alignment film according to (21) or (22) above with a radiation of polarized light.

(24) A liquid crystal display element comprising the liquid crystal alignment film according to any one of the above (21) to (23).

A liquid crystal alignment agent containing two kinds of polymers selected from at least one selected from the group consisting of a polyimine precursor having a specific structure or a polyimine, and a method for suppressing an afterimage caused by an AC drive, and A liquid crystal alignment film having a sealant and adhesion to the underlying substrate. In particular, a liquid crystal alignment film for a photo-alignment treatment method which is obtained by irradiating a polarized radiation is useful. Therefore, the liquid crystal display element having the liquid crystal alignment film obtained by the liquid crystal alignment agent of the present invention is excellent in reliability, and is suitable for use in a large-screen and high-definition liquid crystal television, a small-sized navigation system, a smart phone, or the like.

The reason why the liquid crystal alignment film obtained by the liquid crystal alignment agent of the present invention can solve the problem of the present invention is not very clear, but it is presumed to be the following reason.

The specific structure (1A) and the specific structure (1B) are structures capable of improving the alignment of the liquid crystal. Therefore, the liquid crystal alignment film obtained from the liquid crystal alignment agent containing the polymer having such a structure is a liquid crystal alignment film having excellent liquid crystal alignment, and in the liquid crystal display element, the afterimage caused by the AC driving can be suppressed. Moreover, the specific structure (1A) and the specific structure (1B) also have It has the effect of improving the adhesion to the sealant.

The specific structure (2) is such that it can be improved with the underlying substrate, for example Adhesion of ITO (Indium Tin Oxide) substrate or the like. Therefore, the liquid crystal alignment film obtained from the liquid crystal alignment agent containing the polymer having such a structure is a liquid crystal alignment film which has excellent adhesion to the underlying substrate. However, each specific structure may not be obtained depending on the position of the liquid crystal alignment film. That is, the specific structure (1A) and the specific structure (1B) must exist in the vicinity of the interface of the liquid crystal alignment film, and the specific structure (2) must exist in the inside of the liquid crystal alignment film and the interface of the underlying substrate.

Also, in general, two different surface free energies When the components are blended, it is known that the components having a lower surface free energy tend to be present on the surface of the film, and the components having a higher free energy on the surface may be concentrated in the interior of the film or at the interface with the substrate. The specific polymer (A), because of the specific structure (1A) or the specific structure (1B) having a low polarity, forms a component having a low surface free energy. On the other hand, when the specific polymer (B) is compared with the specific structure (1A) and the specific structure (1B), it has a specific structure (1) having a higher polarity, so that a specific polymer (A) is formed. Higher surface free energy ingredients. Therefore, the liquid crystal alignment film obtained from the liquid crystal alignment agent containing the specific polymer (A) and the specific polymer (B), that is, the liquid crystal alignment film obtained by coating the liquid crystal alignment agent, the specific polymer (A) is concentrated in the vicinity of the interface of the liquid crystal alignment film, whereas the specific polymer (B) is in a state of being present in the liquid crystal alignment film and the interface with the substrate.

Especially using a specific structure (1A) and a specific structure (1B), plus the specific structure (2), as described above, is easier The case where each specific polymer is formed to be partial. Therefore, the liquid crystal alignment film of the present invention can have the effects of the liquid crystal alignment property, the sealant, and the adhesion to the underlying substrate.

[Fig. 1] A simplified representation of a test sample substrate used in the evaluation of the sealant and the adhesion to the underlying substrate.

<Specific structure (1A) ‧Specific structure (1B)>

The specific polymer (A) of the present invention is a polymer containing at least one selected from the group consisting of a polyimide precursor and a polyimine, and the polyimine precursor and the polyimine have a lower At least one of the structures selected from the structures shown in the formulas [1A] and [1B] is described.

In the formula [1A], X ^A represents a protecting group substituted with a hydrogen atom via heat. This group means a bond which is bonded to a nitrogen atom, is dissociated by heat, and is substituted with a hydrogen atom to form an amine group to form a protective group. The protective group is dissociated by heat and is substituted with a hydrogen atom. The sintering temperature at the time of producing the liquid crystal alignment film is preferably from 150 to 300 ° C, more preferably from 200 to 270. The protective group is not particularly limited as long as it is dissociated by heat and is substituted with a hydrogen atom. Specifically, it is exemplified by the following formula [a-1] to formula [a-6]. At least one selected from the group, wherein the protecting group represented by the formula [a-1] or [a-6] is preferred.

(In the formula [a-2], R ¹ represents an alkylene group having 1 to 5 carbon atoms).

Among them, it is preferred to use a protective group having a structure represented by the formula [a-1] or the formula [a-6].

The above formula [1A] is represented by the following formula [1a] and formula [1b] The structure shown is preferred.

In the formula [1a], X ^a represents a hydrogen atom or an organic group having 1 to 20 carbon atoms. Among them, a hydrogen atom or an organic group having 1 to 10 carbon atoms is preferred.

In the formula [1a], X ^b represents a protective group of a carboxyl group, which is a group substituted with a hydrogen atom via heat. It is the same as the above X ^A , and its preferred examples are also the same. m represents an integer of 1 or 2, and in the case where m is 2, X ^a does not have a substituent. Among them, 1 is better.

In the formula [1b], X ^c represents a protecting group of a carboxyl group, which is a group substituted with a hydrogen atom via heat. It is the same as the above definitions of X ^A and X ^b , and the preferred examples thereof are also the same.

Specific structures represented by the formula [1a] and the formula [1b] are, for example, the following formula [XA-1] to the formula [XA-12].

(In the formula [XA-1] to the formula [XA-6], A ¹ to A ⁶ each independently represent at least one structure selected from the structures represented by the above formulas [a-1] to [a-6]. In the formula [XA-1], n1 represents an integer of 0 to 10, and in the formula [XA-2] to the formula [XA-6], n2 to n6 represent an integer of 1 to 10).

(In the formula [XA-7] to the formula [XA-12], A ⁷ to A ¹⁸ each independently represent at least one structure selected from the structures represented by the above formulas [a-1] to [a-6]. In the formula [XA-7], n7 represents an integer of 0 to 10, and in the formula [XA-8] to the formula [XA-12], n8 to n12 represent an integer of 1 to 10).

In the formula [1B], X ^B represents a single bond or an organic group having 1 to 40 carbon atoms. Specific examples of the organic group having 1 to 40 carbon atoms may include an ether bond (-O-), a guanamine bond (-CONH- or NHCO-), an ester bond (-COO- or OCO-), and a thioether. A terminal alkyl group (-S-) or a thioester bond (-S(=O) ₂ -) alkylene group, an extended aryl group or a combination thereof. At this time, the atom bonded to the ester group (-COO-) in the formula [1B] is a carbon atom.

In the formula [1B], X ^C represents a protective group of a carboxyl group, which is a group substituted with a hydrogen atom via heat. The base is the same as the above X ^A , and the preferred examples thereof are also the same. The structure represented by the above formula [1B] is preferably a structure having a structure represented by the following formula [1c].

In the formula [1c], X ^d represents a single bond or an organic group having 1 to 20 carbon atoms. In the case where X ^d is a single bond, X ^e does not have a substituent. Among them, a single bond or an organic group having 1 to 10 carbon atoms is preferred.

In the formula [1c], X ^e represents a hydrogen atom or an organic group having 1 to 20 carbon atoms. Among them, a hydrogen atom or an organic group having 1 to 10 carbon atoms is preferred. X ^f represents a protecting group of a carboxyl group which is a group substituted with a hydrogen atom via heat. The base is the same as the above X ^A , and the preferred examples thereof are also the same. n represents an integer from 1 to 4. Among them, 1 or 2 is preferred.

The specific structure represented by the formula [1c] is, for example, a structure represented by the following formula [XC-1] to the formula [XC-12].

(In the formula [XC-1] to the formula [XC-6], B ¹ to B ⁶ each independently represent at least one structure selected from the structures represented by the above formulas [a-1] to [a-6]. In the formula [XC-1], n1 represents an integer of 0 to 10, and in the formula [XC-2] to the formula [XC-6], n2 to n6 represent an integer of 1 to 10).

(In the formula [XC-7] to the formula [XC-12], B ⁷ to B ¹⁸ each independently represent at least one structure selected from the structures represented by the above formulas [a-1] to [a-6]. In the formula [XC-7], n7 represents an integer of 0 to 10, and in the formula [XC-8] to the formula [XC-12], n8 to n12 represent an integer of 1 to 10).

<Specific structure (2)>

The specific polymer (B) of the present invention is a polymer containing at least one selected from the group consisting of a polyimine precursor having a specific structure (2) represented by the following formula [2] and a polyimine.

In the formula [2], Y ¹ and Y ⁷ each independently represent a single bond, an alkyl group having 1 to 10 carbon atoms, -O-, -S-, -N(R ¹ )-, -CON(R ² ). At least one selected from the group consisting of -, -N(R ³ )CO-, -CH ₂ O-, -COO-, and OCO-. However, R ¹ , R ² and R ³ each independently represent a hydrogen atom or an alkyl group having 1 to 3 carbon atoms. Among them, a single bond, -O-, -S-, -OCO- or COO- is preferred. It is preferably a single bond, -O- or S- from the viewpoint of the liquid crystal alignment property and the film hardness of the liquid crystal alignment film.

In the formula [2], Y ² and Y ⁶ each independently represent an alkylene group having 1 to 10 carbon atoms. Among them, an alkylene group having 1 to 3 carbon atoms is preferred, and the structure may be either linear or branched. Specifically, from the viewpoint of the liquid crystal alignment property and the film hardness of the liquid crystal alignment film, a methyl group (-CH ₂ -) and an extended ethyl group (-CH ₂ CH) having a structure having a freely rotating portion and a small steric hindrance are used. ₂ -), propyl (-(CH ₂ ) ₃ -) or isopropyl (-C(CH ₂ ) ₂ -) is preferred.

In the formula [2], Y ³ and Y ⁵ each independently represent a hydrogen atom or an alkyl group having 1 to 10 carbon atoms. Among them, a hydrogen atom or an alkyl group having 1 to 3 carbon atoms is preferred. Particularly preferred is a hydrogen atom.

In the formula [2], Y ⁴ represents an oxygen atom or a sulfur atom. Among them, in view of the film hardness of the liquid crystal alignment film, an oxygen atom is preferred.

<Specific polymer (A) ‧ Specific polymer (B) >

The specific polymer (A) and the specific polymer (B) are at least one polymer selected from the group consisting of a polyimide precursor and a polyimine (also collectively referred to as a polyimide polymer). Among them, the polyimide-based polymer of the present invention is preferably a polyimine precursor or a polyimine which is obtained by reacting a diamine component with a tetracarboxylic acid component.

The polyimine precursor system is a structure represented by the following formula [A].

(In the formula [A], R ¹ is a tetravalent organic group, R ² is a divalent organic group, and A ¹ and A ² each independently represent a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, and A ³ and A ⁴ Each independently represents a hydrogen atom, an alkyl group having 1 to 5 carbon atoms or an ethylidene group, and n represents a positive integer).

The diamine component may, for example, be a diamine having two primary or secondary amine groups in the molecule.

Further, examples of the tetracarboxylic acid component include a tetracarboxylic acid compound, a tetracarboxylic dianhydride, a tetracarboxylic acid dihalide compound, a tetracarboxylic acid dialkyl ester compound, or a tetracarboxylic acid dialkyl ester dihalide compound. .

When a polyphthalic acid in which A ¹ and A ² in the formula [A] are a hydrogen atom is to be produced, a diamine having two primary or secondary amine groups in the molecule may be obtained, and a tetracarboxylic acid compound or a tetracarboxylic acid. An acid anhydride can be obtained by carrying out a reaction.

When the A ¹ and A ² in the formula [A] are a polyalkylene amide having an alkylene group having 1 to 5 carbon atoms, the diamine, the tetracarboxylic acid dihalide compound, and the tetracarboxylic acid may be used. A dialkyl acid ester compound or a dicarboxylic acid dialkylate dihalide compound can be obtained by reacting. Further, in the polyamic acid obtained by the above method, an alkylene group having 1 to 5 carbon atoms of A ¹ and A ² represented by the formula [A] can be introduced.

The specific polymer (A) is a polymer having at least one structure selected from the specific structure (1A) and the specific structure (1B).

Import a specific structure (1A) or a specific structure (1B) into a specific aggregate The method in the object (A) is not particularly limited, and it is preferred to use a diamine having a specific structure (1A) or a specific structure (1B) as a diamine component. It is particularly preferred to use a diamine having the structure represented by the above formula [1a], formula [1b] or formula [1c].

Specifically, it is preferred to use a diamine (also referred to as a specific diamine (1)) represented by the following formula [1-1].

In the formula [1-1], X ^D represents an organic group having 5 to 50 carbon atoms having at least one structure selected from the structures represented by the above formulas [1a], [1b] and [1c]. In the formula [1-1], A ¹ and A ² each independently represent a hydrogen atom or an alkyl group having 1 to 5 carbon atoms.

More specifically, for example, a diamine represented by the following formula [1a-1] to formula [1c-1] is preferably used.

In the formula [1a-1], X ¹ represents a single bond, an alkyl group having 1 to 10 carbon atoms, -O-, -N(R ¹ )-, -CON(R ² )-, -N(R ³ At least one selected from the group consisting of CO-, -CH ₂ O-, -COO-, and OCO-. However, R ¹ , R ² and R ³ each independently represent a hydrogen atom or an alkyl group having 1 to 3 carbon atoms. In particular, a single bond, -O-, -CONH-, -NHCO-, -COO- or OCO- is preferred.

In the formula [1a-1], X ² represents a single bond and an alkylene group having 1 to 10 carbon atoms. Among them, a single bond or an alkyl group having 1 to 5 carbon atoms is preferred. X ^a represents a hydrogen atom or an organic group having 1 to 20 carbon atoms, more preferably a hydrogen atom or an organic group having 1 to 10 carbon atoms. The organic group having 1 to 10 carbon atoms is preferably -(CH ₂ ) _n -COO-tBu (an integer of n = 1 to 5, and tt represents a tert-butyl group).

In the formula [1a-1], X ^b is a group substituted with a hydrogen atom by dissociation by heating, and is a protective group of a carboxyl group. The specific example of the base is the same as the above X ^A , and a preferred example thereof is the same as the above X ^A .

In the formula [1a-1], m represents an integer of 1 or 2. In the case where m in the formula [1a] is 2, X ^a does not have a substituent. p represents an integer from 1 to 4. Among them, from the viewpoints of availability of raw materials or easiness of synthesis, it is preferably 1 to 3. The better is 1~2. q represents an integer from 1 to 4. Among them, from the viewpoints of availability of raw materials or easiness of synthesis, it is preferably 1 to 3. The better is 1~2.

In the formula [1b-1], X ³ and X ⁷ each independently represent a single bond, an alkylene group having 1 to 10 carbon atoms, -O-, -N(R ¹ )-, -CON(R ² )-, -N(R ³ )CO-, -CH ₂ O-, -COO- or OCO- selected at least one organic group. However, R ¹ , R ² and R ³ each independently represent a hydrogen atom or an alkyl group having 1 to 3 carbon atoms. Among them, a single bond, -O-, -CONH-, -NHCO-, -COO- or OCO- is preferred.

In the formula [1b-1], X ⁴ and X ⁶ each independently represent a single bond or an alkylene group having 1 to 10 carbon atoms. In particular, a single bond or an alkyl group having 1 to 5 carbon atoms is preferred.

X ⁵ represents a single bond or an alkylene group having 1 to 10 carbon atoms. Among them, a single bond or an alkyl group having 1 to 5 carbon atoms is preferred. X ^c is a protecting group for a carboxyl group, and is the same as X ^b described above, and further preferred examples thereof are also the same.

In the formula [1b-1], r represents an integer of 1 to 4. Among them, from the viewpoints of availability of raw materials or easiness of synthesis, it is preferably 1 to 3. The better is, 1~2.

In the formula [1c-1], X ⁸ represents a single bond, an alkyl group having 1 to 10 carbon atoms, -O-, -N(R ¹ )-, -CON(R ² )-, -N(R ³ At least one organic group selected from CO-, -CH ₂ O-, -COO- or OCO-. However, R ¹ , R ² and R ³ each independently represent a hydrogen atom or an alkyl group having 1 to 3 carbon atoms. In particular, a single bond, -O-, -CONH-, -NHCO-, -COO- or OCO- is preferred.

In the formula [1c-1], X ⁹ represents a single bond, an alkylene group having 1 to 10 carbon atoms, preferably a single bond or an alkylene group having 1 to 5 carbon atoms. X ^d represents a single bond or an organic group having 1 to 20 carbon atoms. Among them, a single bond or an organic group having 1 to 10 carbon atoms is preferred. More preferably, it is a single bond or a carbon atom (>CH-). X ^e represents a hydrogen atom or an organic group having 1 to 20 carbon atoms. At this time, when X ^d is a single bond, there is no X ^e . Among them, a hydrogen atom or NH-COO-tBu (tBu represents tert-butyl) is preferred.

In the formula [1c-1], X ^f is a protective group of a carboxyl group, which is the same as the above X ^b and X ^b , and further preferred examples thereof are also the same. n represents an integer from 1 to 4. Among them, from the viewpoints of availability of raw materials or easiness of synthesis, it is preferably 1 to 3, more preferably 1 to 2. s represents an integer of 1 to 4, and it is preferably 1 to 3, and more preferably 1 to 2, from the viewpoints of availability of raw materials or easiness of synthesis. t represents an integer of 1 to 4, and preferably 1 to 3, preferably 1 to 2, from the viewpoints of availability of raw materials or easiness of synthesis.

In the formula [1a-1] to the formula [1c-1], A ¹ to A ⁶ each independently represent a hydrogen atom or an alkyl group having 1 to 5 carbon atoms.

The specific diamine of the specific diamine (1) of the present invention is, for example, a diamine represented by the following formula [1d].

(In the formula [1d], D represents at least one selected from the structures represented by the above formula [XA-1] to the formula [XA-12] and the formula [XC-1] to the formula [XC-12], n represents an integer from 1 to 4).

More specifically, a diamine, for example, the following formula [1d-1]~ A diamine represented by [1d-11].

(In the formula [1d-1] to the formula [1d-5], R ¹ to R ⁷ each independently represent at least one structure selected from the above formula [a-1] to formula [a-6], formula [ In the formula [1d-5], A ¹ to A ¹⁰ each independently represent a hydrogen atom or an alkyl group having 1 to 5 carbon atoms.

(In the formula [1d-6] to the formula [1d-9], R ⁸ to R ¹⁴ each independently represent at least one structure selected from the structures represented by the above formulas [a-1] to [a-6]. In the formula [1d-6] to the formula [1d-9], A ¹¹ to A ¹⁸ each independently represent a hydrogen atom or an alkyl group having 1 to 5 carbon atoms.

Among them, the specific diamine (1) of the present invention is preferably a diamine represented by the above formula [1d-1] to formula [1d-5].

Further, as the specific diamine (1) of the present invention, a diamine represented by the following formula [1d-10] and the formula [1d-11] can also be used.

(In the formula [1d-10] and the formula [1d-11], R ¹⁵ to R ¹⁸ each independently represent at least one structure selected from the structures represented by the above formula [a-1] to formula [a-6]. In the formula [1d-11], A ¹⁹ and A ²⁰ each independently represent a hydrogen atom or an alkyl group having 1 to 5 carbon atoms.

The specific diamine (1) in the specific polymer (A) is preferably from 5 to 40 mol% in 100 mol% of the total diamine component. Among them, 5 to 30 mol% is preferred. It is preferably 5 to 20 mol%.

The specific diamine (1) of the present invention can be blended with a solvent of a specific polymer (A), or a coating property of a liquid crystal alignment agent, a liquid crystal alignment property, a voltage retention ratio, and a storage in the case of a liquid crystal alignment film. One type or a mixture of two or more types may be used.

The specific polymer (B) is a polymer having a specific structure (2).

The method of introducing the specific structure (2) into the specific polymer (B) is not particularly limited, and it is preferred to use a diamine having a specific structure (2) as a diamine component. Particularly preferred is a diamine having a structure represented by the above formula [2].

Specifically, for example, the following formula [2-1] is used. Preferred diamines (also known as specific diamines (2)) are preferred.

In the formula [2-1], Y ^A is an organic group having a carbon number of 10 to 50 having a structure represented by the above formula [2]. A ¹ and A ² each independently represent a hydrogen atom or an alkyl group having 1 to 5 carbon atoms. More specifically, it is preferred to use a diamine represented by the following formula [2a].

In the formula [2a], Y ¹ and Y ⁷ each independently represent a single bond, an alkyl group having 1 to 10 carbon atoms, -O-, -S-, -N(R ¹ )-, -CON(R ² ). At least one selected from the group consisting of -, -N(R ³ )CO-, -CH ₂ O-, -COO-, and OCO-. However, R ¹ , R ² and R ³ each independently represent a hydrogen atom or an alkyl group having 1 to 3 carbon atoms. Among them, a single bond, -O-, -S-, -OCO- or COO- is preferred. More preferably, from the viewpoint of liquid crystal alignment property and film hardness, it is a single bond, -O- or S- of a structure which is as soft as possible and has a small steric hindrance.

In the formula [2a], Y ² and Y ⁶ each independently represent an alkylene group having 1 to 10 carbon atoms. Among them, an alkylene group having 1 to 3 carbon atoms is preferred, and the structure may be either linear or branched. Specifically, from the viewpoint of the liquid crystal alignment property and the film hardness of the liquid crystal alignment film, a methyl group (-CH ₂ -) and an extended ethyl group (-CH ₂ CH) having a structure having a freely rotating portion and a small steric hindrance are used. ₂ -), propyl (-(CH ₂ ) ₃ -) or isopropyl (-C(CH ₂ ) ₂ -) is preferred.

In the formula [2a], Y ³ and Y ⁵ each independently represent a hydrogen atom or an alkyl group having 1 to 10 carbon atoms. Among them, a hydrogen atom or an alkyl group having 1 to 3 carbon atoms is preferred. Particularly preferred is a hydrogen atom.

In the formula [2a], Y ⁴ represents an oxygen atom or a sulfur atom. Among them, in view of the film hardness of the liquid crystal alignment film, an oxygen atom is preferred.

In the formula [2a], a combination of Y ¹ , Y ² , Y ³ , Y ⁴ , Y ⁵ , Y ⁶ and Y ⁷ is preferred, for example, as shown in Table 1 below.

Among them, the combination of the formula [2-1a], the formula [2-2a], the formula [2-4a], the formula [2-5a], the formula [2-7a], and the formula [2-8a] is preferred. .

In the formula [2a], A1 and A2 each independently represent a hydrogen atom or an alkyl group having 1 to 5 carbon atoms.

a specific diamine of a specific diamine (2), for example, the following formula [2a-1]~ A diamine represented by the formula [2a-3].

(In the formula [2a-1] to the formula [2a-3], A ¹ to A ⁶ each independently represent a hydrogen atom or an alkyl group having 1 to 5 carbon atoms).

The specific diamine (2) in the specific polymer (B) is preferably from 10 to 100 mol% in 100 mol% of the total diamine component. Among them, 20 to 100 mol% is preferred. It is preferably 30 to 100 mol%.

The specific diamine (2) can be blended with a solvent of a specific polymer (B), a coating property of a liquid crystal alignment agent, a liquid crystal alignment property, a voltage holding ratio, and an accumulated charge in the case of a liquid crystal alignment film. One type or two or more types may be used in combination.

In the preparation of the diamine component of the specific polymer (A), The other diamine (also referred to as a specific second diamine) represented by the following formula [3-1] is preferably used together with the specific diamine (1).

In the formula [3-1], Y ^A represents at least one structure selected from the structures represented by the following formulas [3a-1] to [3a-9].

(in the formula [3a-9], n represents an integer of 1 to 5).

In the formula [3-1], A ¹ and A ² each independently represent a hydrogen atom or an alkyl group having 1 to 5 carbon atoms.

Wherein, the specific diamine is preferably a diamine represented by the formula [3a-1] to the formula [3a-4], the formula [3a-6], the formula [3a-8] or the formula [3a-9]. . Preferably, it is a formula [3a-1] to a formula [3a-3], a formula [3a-8] or a formula [3a-9]. Particularly preferred is the formula [3a-1], the formula [3a-2] or the formula [3a-9].

a specific second diamine in a specific polymer (A), in all The diamine content of 100% by mole is preferably from 50 to 95% by mole. More preferably 60 to 95% by mole. Very good for 80~95%.

The specific second diamine can be blended with a solvent of a specific polymer (A), a coating property of a liquid crystal alignment agent, a liquid crystal alignment property as a liquid crystal alignment film, a voltage retention ratio, and an accumulated charge. One type or two or more types may be used in combination.

The diamine component of the specific polymer (A) and the specific polymer (B) may be simultaneously contained in the range of the effect of the present invention, together with the specific diamine (1), the specific diamine (2) and the specific second diamine. Other diamines (also known as other diamines) are used.

Specifically, for example, 2,4-dimethyl-m-phenylene Diamine, 2,6-diaminotoluene, m-phenylenediamine, p-phenylenediamine, 4,4'-diaminobiphenyl, 3,3'-dimethyl-4 , 4'-diaminobiphenyl, 3,3'-dimethoxy-4,4'-diaminobiphenyl, 3,3'-dihydroxy-4,4'-diamine linkage Phenyl, 3,3'-dicarboxy-4,4'-diaminobiphenyl, 3,3'-difluoro-4,4'-biphenyl, 3,3'-trifluoromethyl- 4,4'-diaminobiphenyl, 3,4'-diaminobiphenyl, 3,3'-diaminobiphenyl, 2,2'-diaminobiphenyl, 2, 3'-Diaminobiphenyl, 4,4'-diaminodiphenylmethane, 3,3'-diaminodiphenylmethane, 3,4'-diaminodiphenylmethane, 2 , 2'-diaminodiphenylmethane, 2,3'-diaminodiphenylmethane, 4,4'-diaminodiphenyl ether, 3,3'-diaminodiphenyl ether , 3,4'-diaminodiphenyl ether, 2,2'-diaminodiphenyl ether, 2,3'-diaminodiphenyl ether, 4,4'-sulfonyldiphenylamine , 3,3'-sulfonyldiphenylamine, bis(4-aminophenyl)decane, bis(3-amino Phenyl)decane, dimethyl-bis(4-aminophenyl)decane, dimethyl-bis(3-aminophenyl)decane, 4,4'-thiodiphenylamine, 3,3'- Thio-diphenylamine, 4,4'-diaminodiphenylamine, 3,3'-diaminodiphenylamine, 3,4'-diaminodiphenylamine, 2,2'-di Aminodiphenylamine, 2,3'-diaminodiphenylamine, N-methyl(4,4'-diaminodiphenyl)amine, N-methyl (3,3'-di Aminodiphenyl)amine, N-methyl(3,4'-diaminodiphenyl)amine, N-methyl(2,2'-diaminodiphenyl)amine, N-methyl (2,3'-Diaminodiphenyl)amine, 4,4'-diaminobenzophenone, 3,3'-diaminobenzophenone, 3,4'-diaminodi Benzophenone, 1,4-diaminonaphthalene, 2,2'-diaminobenzophenone, 2,3'-diaminobenzophenone, 1,5-diaminonaphthalene, 1, 6-Diaminonaphthalene, 1,7-diaminonaphthalene, 1,8-diaminonaphthalene, 2,5-diaminonaphthalene, 2,6-diaminonaphthalene, 2,7-diamino Naphthalene, 2,8-diaminonaphthalene, 1,2-bis(4-aminophenyl)ethane, 1,2-bis(3-aminophenyl)ethane, 1,3-double (4 -aminophenyl)propane, 1,3-bis(3-aminophenyl)propane, 1,4-bis(4-aminophenyl)butane, 1,4-bis(3- Phenyl)butane, bis(3,5-diethyl-4-aminophenyl)methane, 1,4-bis(4-aminophenoxy)benzene, 1,3-bis(4- Aminophenoxy)benzene, 1,4-bis(4-aminophenyl)benzene, 1,3-bis(4-aminophenyl)benzene, 1,4-bis(4-aminobenzyl) Benzene, 1,3-bis(4-aminophenoxy)benzene, 4,4'-[1,4-phenylenebis(methyl)diphenylamine, 4,4'-[1, 3-phenylphenylbis(methyl)diphenylamine, 3,4'-[1,4-phenylenebis(methyl)diphenylamine, 3,4'-[1,3-phenylene Bis(methyl)diphenylamine, 3,3'-[1,4-phenylenebis(methyl)diphenylamine, 3,3'-[1,3-phenylene double Methyl)]diphenylamine, 1,4-phenylphenylbis[(4-aminophenyl)methanone], 1,4-phenylene bis[(3-amino) Phenyl)methanone], 1,3-phenylene bis[(4-aminophenyl)methanone], 1,3-phenylphenylbis[(3-aminophenyl)methanone], 1 , 4-phenylphenyl bis(4-aminobenzoate), 1,4-phenylphenylbis(3-aminobenzoate), 1,3-phenylene bis(4-amine Benzoate), 1,3-phenylene bis(3-aminobenzoate), bis(4-aminophenyl)terephthalate, bis(3-aminophenyl) Terephthalate, bis(4-aminophenyl)isophthalate, bis(3-aminophenyl)isophthalate, N,N'-(1,4-stretch Phenyl) bis(4-aminobenzamide), N,N'-(1,3-phenylene)bis(4-aminobenzamide), N,N'-(1,4 -phenyl)bis(3-aminobenzamide), N,N'-(1,3-phenylene)bis(3-aminobenzamide), N,N'-double ( 4-aminophenyl)terephthalamide, N,N'-bis(3-aminophenyl)terephthalamide, N,N'-bis(4-aminophenyl) Benzoguanamine, N,N'-bis(3-aminophenyl)m-xylyleneamine, 9,10-bis(4-aminophenyl)anthracene, 4,4'-bis (4) -aminophenoxy)diphenylanthracene, 2,2'-bis[4-(4-aminophenoxy)phenyl]propane, 2,2'-bis[4-(4-aminobenzene) Oxy)phenyl]hexafluoro Propane, 2,2'-bis(4-aminophenyl)hexafluoropropane, 2,2'-bis(3-aminophenyl)hexafluoropropane, 2,2'-bis(3-amino- 4-methylphenyl)hexafluoropropane, 2,2'-bis(4-aminophenyl)propane, 2,2'-bis(3-aminophenyl)propane, 2,2'-double ( 3-amino-4-methylphenyl)propane, 1,3-bis(4-aminophenoxy)propane, 1,3-bis(3-aminophenoxy)propane, 1,4- Bis(4-aminophenoxy)butane, 1,4-bis(3-aminophenoxy)butane, 1,5-bis(4-aminophenoxy)pentane, 1,5 - bis(3-aminophenoxy)pentane, 1,6-bis(4-aminophenoxy)hexane, 1,6-bis(3-aminophenoxy)hexane, 1, 7-bis(4-amino group Phenoxy)heptane, 1,7-(3-aminophenoxy)heptane, 1,8-bis(4-aminophenoxy)octane, 1,8-bis(3-amino Phenoxy)octane, 1,9-bis(4-aminophenoxy)decane, 1,9-bis(3-aminophenoxy)decane, 1,10-(4-amino group Phenoxy)decane, 1,10-(3-aminophenoxy)decane, 1,11-(4-aminophenoxy)undecane, 1,11-(3-aminobenzene Oxy) undecane, 1,12-(4-aminophenoxy)dodecane, 1,12-(3-aminophenoxy)dodecane, bis(4-aminocyclohexyl) Methane, bis(4-amino-3-methylcyclohexyl)methane, 1,3-diaminopropane, 1,4-diaminobutane, 1,5-diaminopentane, 1,6 -diaminohexane, 1,7-diaminoheptane, 1,8-diaminooctane, 1,9-diaminodecane, 1,10-diaminodecane, 1,11 - Diaminoundecane or 1,12-diaminododecane, and the amines in which the amine group is a secondary amine group, and the like.

Other diamines, which can be combined with specific polymers (A) and specific poly The compound (B) has a solubility in a solvent, a coating property of a liquid crystal alignment agent, a liquid crystal alignment property, a voltage retention ratio, and an accumulated charge in the case of a liquid crystal alignment film, and may be used alone or in combination of two or more. .

The specific polymer (A) and the specific polymer (B), that is, the tetracarboxylic acid component used in the production of the polyamidene-based polymer, are used to use the tetracarboxylic acid represented by the following formula [4]. The dianhydride is preferred. In this case, not only the tetracarboxylic dianhydride represented by the formula [4] but also a tetracarboxylic acid, a tetracarboxylic acid dihalide compound, a dicarboxylic acid dialkyl ester compound or a tetracarboxylic acid of the tetracarboxylic acid derivative thereof may be used. A dialkyl ester dihalide compound (tetracarboxylic dianhydride represented by the formula [4] and a derivative thereof are collectively referred to as a specific tetracarboxylic acid component).

(In the formula [4], Z represents a structure of at least one selected from the following formulas [4a] to [4q]).

In the formula [4a], each of Z ¹ to Z ⁴ independently represents a hydrogen atom, a methyl group, an ethyl group, a propyl group, a chlorine atom or a benzene ring. Z ⁵ and Z ⁶ each independently represent a hydrogen atom or a methyl group.

In the case of Z ¹ in the formula [4], the formula [4a], the formula [4c] to the formula [4g], and the formula [4k] are used in terms of easiness of synthesis or easiness of polymerization reactivity when producing a polymer. The tetracarboxylic dianhydride of the formula [4m] or the formula [4p] and the tetracarboxylic acid derivative thereof are preferred. The structure represented by the formula [4a], the formula [4e] to the formula [4g], the formula [4l], the formula [4m] or the formula [4p] is preferred. Particularly preferred are tetracarboxylic dianhydrides of the formula [4a], formula [4e], formula [4f], formula [41], formula [4m] or formula [4p] and tetracarboxylic acid derivatives thereof.

More specifically, for example, the following formula [4a-- 1] or formula [4a-2] is preferred.

The specific tetracarboxylic acid component in the specific polymer (A) and the specific polymer (B) is preferably 50 to 100 mol% based on 100 mol% of the total tetracarboxylic acid component. Among them, 70 to 100 mol% is preferred. It is preferably 80 to 100 mol%.

a specific tetracarboxylic acid component which can be combined with a specific polymer (A) and One type or two or more types of characteristics of the solubility of the specific polymer (B) in the solvent, the coating property of the liquid crystal alignment agent, the alignment property of the liquid crystal in the case of the liquid crystal alignment film, the voltage retention ratio, and the charge accumulation. Mixed use.

In the polyamidene-based polymer of the specific polymer (A) and the specific polymer (B), other tetracarboxylic acid components other than the specific tetracarboxylic acid component can be used without departing from the effects of the present invention.

The other tetracarboxylic acid component, for example, a tetracarboxylic acid compound, a tetracarboxylic dianhydride, a tetracarboxylic acid dihalide compound, a dicarboxylic acid dialkyl ester compound or a dicarboxylic acid dialkyl ester dihalide shown below. Compounds, etc.

That is, the other tetracarboxylic acid component may, for example, 1,2,5,6-naphthalenetetracarboxylic acid, 1,4,5,8-naphthalenetetracarboxylic acid, 1,2,5,6-nonanedicarboxylic acid, 3,3',4,4'-linked Phenyltetracarboxylic acid, 2,3,3',4-biphenyltetracarboxylic acid, bis(3,4-dicarboxyphenyl)ether, 3,3',4,4'-benzophenone Carboxylic acid, bis(3,4-dicarboxyphenyl)anthracene, bis(3,4-dicarboxyphenyl)methane, 2,2-bis(3,4-dicarboxyphenyl)propane, 1,1, 1,3,3,3-hexafluoro-2,2-bis(3,4-dicarboxyphenyl)propane, bis(3,4-dicarboxyphenyl)dimethyl decane, bis (3,4- Dicarboxyphenyl)diphenylnonane, 2,3,4,5-pyridinetetracarboxylic acid, 2,6-bis(3,4-dicarboxyphenyl)pyridine, 3,3',4,4'- Diphenylphosphonium tetracarboxylic acid, 3,4,9,10-decanetetracarboxylic acid or 1,3-diphenyl-1,2,3,4-cyclobutanetetracarboxylic acid or the like.

The other tetracarboxylic acid component can be blended with the solubility of the specific polymer (A) and the specific polymer (B) in the solvent or the coating property of the liquid crystal alignment agent, and the liquid crystal alignment property and voltage in the case of the liquid crystal alignment film. One type or a mixture of two or more types may be used in combination, such as a retention ratio and an accumulated charge.

<Specific Polymer (A) ‧ Specific Polymer (B) Production Method>

In the present invention, the specific polymer (A) and the specific polymer (B) are produced, that is, the method for producing the polyilylimine-based polymer is not particularly limited. It is usually obtained by reacting a diamine component with a tetracarboxylic acid component. In general, for example, a derivative of tetracarboxylic dianhydride and its tetracarboxylic acid A method in which at least one tetracarboxylic acid component selected from the group is reacted with a diamine component formed from one or a plurality of diamines to obtain a polyamic acid. Specifically, a method of polycondensing a tetracarboxylic dianhydride with a primary or secondary diamine to obtain a poly-proline, and dehydrating a polycondensation reaction of a tetracarboxylic acid with a primary or secondary diamine can be used. A method of producing poly-proline or a method of polycondensing a tetracarboxylic acid dihalide with a primary or secondary diamine to obtain a poly-proline.

In the method for producing a polyalkylene amide, a method of polycondensing a carboxylic acid group by dialkylation of a dialkyl esterified tetracarboxylic acid with a primary or secondary diamine may also be used. A method of polycondensing a tetracarboxylic acid dihalide with a primary or secondary diamine or a method of converting a carboxyl group of a polylysine to an ester.

In the method for producing a polyimine, a method of forming a polyimine by ring-closing the polyamic acid or polyalkyl amide may be used.

The reaction of the diamine component with the tetracarboxylic acid component is usually carried out by allowing the diamine component and the tetracarboxylic acid component to be carried out in a solvent. The solvent to be used at this time is not particularly limited as long as it can dissolve the solvent of the produced polyimide precursor. The specific examples of the solvent used in the following reaction are exemplified, but are not limited to those exemplified.

For example, N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone or γ-butyrolactone, N,N-dimethylformamide, N,N-dimethylacetamidine An amine, dimethyl hydrazine or 1,3-dimethyl-tetrahydroimidazolidone or the like. Further, the polyimine precursor has a high solvent solubility, and may also use methyl ethyl ketone, cyclohexanone, cyclopentanone, 4-hydroxy-4-methyl-2-pentanone or the following formula [D-1]~ The solvent shown in [D-3].

(In the formula [D-1], D ¹ represents an alkyl group having 1 to 3 carbon atoms, and in the formula [D-2], D ² represents an alkyl group having 1 to 3 carbon atoms, and in the formula [D-3], D ³ represents an alkyl group having 1 to 4 carbon atoms).

These solvents may be used singly or in combination. Further, even if it is a solvent which cannot dissolve the polyimide precursor, it may be mixed with the solvent as long as it does not precipitate the range of the produced polyimide precursor. Further, the moisture in the solvent hinders the polymerization reaction, and may even cause hydrolysis of the produced polyimide precursor, so that the solvent is preferably dried by dehydration.

Reaction of a diamine component with a tetracarboxylic acid component in a solvent In the case of dispersing or dissolving the diamine component in a solvent, a solution obtained by directly adding a tetracarboxylic acid component, or dispersing or dissolving it in a solvent may be used, and vice versa. A method of adding a diamine component to a solvent in which a carboxylic acid component is dispersed or dissolved, a method of alternately adding a diamine component and a tetracarboxylic acid component, or the like can be used. Further, when a plurality of kinds of diamine components or tetracarboxylic acid components are used for the reaction, the reaction may be carried out in a state of being premixed, and the respective reactions may be sequentially performed. Further, it is also possible to carry out a mixing reaction by separately reacting the low molecular weight bodies of the respective reactions to obtain a polymer. The polymerization temperature at this time may be selected from any of -20 to 150 ° C, preferably from -5 to 100 ° C. Further, the reaction can be carried out at any concentration. When the concentration is too low, a polymer having a high molecular weight cannot be obtained. When the concentration is too high, the viscosity of the reaction liquid is excessively increased, and the mixture cannot be uniformly stirred. Therefore, it is preferably from 1 to 50% by mass, more preferably from 5 to 30% by mass. The initial stage of the reaction is carried out at a high concentration, and then a solvent may be added.

In the polymerization of the polyimine precursor, the ratio of the total number of moles of the diamine component to the total number of moles of the tetracarboxylic acid component is preferably 0.8 to 1.2. As with the usual polycondensation reaction, the closer the molar ratio is to 1.0, the larger the molecular weight of the resulting polyimide precursor.

The polyimine of the present invention is a precursor of the above polyimine The polyimine imine obtained by ring closure, in which the ring closure ratio (also referred to as the ruthenium imidation ratio) of the proline group is not necessarily 100%, and it can be used in combination with the purpose or purpose. Adjustment.

A method for imidating a polyimine precursor, for example, by heating a solution of a polyimide precursor to thermally imidize or adding a catalyst to a solution of a polyimide precursor to cause a catalyst醯 imidization and the like.

The temperature at which the polyimine precursor is thermally imidized in a solution is 100 to 400 ° C, preferably 120 to 250 ° C, to continuously exclude water generated by the hydrazine imidization reaction into the reaction system. It is better to perform under the outside.

The ruthenium imide of the polyimide precursor can be used in the polymerization. The alkaline catalyst and the acid anhydride are added to the solution of the imine precursor, and then stirred at -20 to 250 ° C, preferably 0 to 180 ° C. Alkaline touch The amount of the medium is 0.5 to 30 moles, preferably 2 to 20 moles, of the prolyl group, and the amount of the anhydride is 1 to 50 moles, preferably 3 to 30 moles of the amidate group. Times. The basic catalyst may, for example, be pyridine, triethylamine, trimethylamine, tributylamine or trioctylamine, and the like, wherein pyridine is maintained in the reaction to maintain an appropriate basicity. good. The acid anhydride may, for example, be acetic anhydride, trimellitic anhydride or pyromellitic dianhydride. Among them, when acetic anhydride is used, it is preferred to carry out purification after completion of the reaction. The imidization rate of the imidization of the catalyst can be controlled by adjusting the amount of the catalyst, the reaction temperature, and the reaction time.

Reaction solution from polyimine precursor or polyimine In the case of recovering the produced polyimine precursor or polyimine, the reaction solution may be added to a solvent to precipitate. Examples of the solvent used for the precipitation include methanol, ethanol, isopropanol, acetone, hexane, butyl cellosolve, heptane, methyl ethyl ketone, methyl isobutyl ketone, toluene, benzene, water, and the like. The polymer precipitated after the solvent is introduced may be filtered, recovered, and dried at normal temperature or under reduced pressure or under reduced pressure. Further, the polymer recovered after the precipitation can be reduced in the polymer by repeating the re-dissolution in the solvent and reprecipitation recovery after 2 to 10 repetitions. In the case of the solvent, for example, an alcohol, a ketone or a hydrocarbon, when three or more solvents selected from the above are used, it is preferable to further improve the efficiency of purification.

Among the specific polymer (A) and the specific polymer (B), a polyalkylene amide is preferably used.

In the method for producing the polyalkyl amide of the present invention, a more specific method is shown in the following (1) to (3).

(1) A method for producing an esterification reaction using polylysine

A method in which a polyamine acid formed from a diamine component and a tetracarboxylic acid component is produced, and the carboxyl group (COOH group) is chemically reacted, that is, an esterification reaction is carried out to produce an alkyl amide.

In the esterification reaction, specifically, the polyamic acid and the esterifying agent are used in the presence of a solvent at -20 to 150 ° C (preferably 0 to 50 ° C) for 30 minutes to 24 hours (more Good for 1~4 hours) method of reaction.

The esterifying agent is preferably removed after the esterification reaction, for example, N,N-dimethylformamide dimethyl acetal, N,N-dimethylformamide diethyl acetal , N,N-dimethylformamide dipropyl acetal, N,N-dimethylformamide dinepentyl butyl acetal, N,N-dimethylformamide di-t- Butyl acetal, 1-methyl-3-p-tolyltriazene, 1-ethyl-3-p-tolyltriazene, 1-propyl-3-p-tolyltriazene, 4-(4,6-dimethoxy-1,3,5-three -2-yl)-4-methylmorpholine chloride and the like. The amount of the esterifying agent to be used is preferably 2 to 6 moles per equivalent of the repeating unit of polylysine. Among them, it is preferably 2 to 4 molar equivalents.

The solvent used for the esterification reaction is, for example, a solvent used for the reaction of the diamine component with a tetracarboxylic acid component, from the viewpoint of the solubility of the polyaminic acid in the solvent. Among them, N,N-dimethylformamide, N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone or γ-butyrolactone is preferred. These solvents may be used alone or in combination of two or more.

The concentration of the polyglycolic acid in the solvent in the esterification reaction is less likely to cause precipitation of polyglycine, and is preferably from 1 to 30% by mass. its In the middle, it is preferably 5 to 20% by mass.

(2) A method for reacting a diamine component with a tetracarboxylic acid diester dichloride

A method of producing a diamine component by reacting a diamine component with a tetracarboxylic acid diester dichloride.

Specifically, for example, the diamine component and the tetracarboxylic acid diester dichloride are used in the presence of a base and a solvent at -20 to 150 ° C (preferably 0 to 50 ° C) for 30 minutes to 24 hours. The method of reacting in hours (preferably 1 to 4 hours).

As the base, pyridine, triethylamine, 4-dimethylaminopyridine or the like can be used. Among them, in view of the fact that the reaction can be stably carried out, pyridine is preferred. The amount of the base to be used is preferably an amount which is easily removed after the above reaction, and is preferably 2 times to 4 times moles relative to the tetracarboxylic acid diester dichloride. Among them, it is preferably 2 times Mo to 3 times Mo.

The solvent to be used in the above reaction, for example, a solvent used for the reaction of the obtained polyamine amide with a tetracarboxylic acid component, and the like. Among them, N,N-dimethylformamide, N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone or γ-butyrolactone is preferred. These solvents may be used alone or in combination of two or more.

In the above reaction, the concentration of the polyalkylamine amide in the solvent is less likely to precipitate the polyalkyl amide, and is preferably from 1 to 30% by mass. Among them, 5 to 20% by mass is preferred. Also, to prevent tetracarboxylic acid diester dichloride Hydrolysis is carried out to prepare a solvent for the polyalkyl amide, and it is preferred to use dehydration as much as possible. Further, the foregoing reaction is carried out in a nitrogen atmosphere to avoid external air incorporation.

(3) A method for reacting a diamine component with a tetracarboxylic acid diester

A method in which a diamine component and a tetracarboxylic acid diester are subjected to a polycondensation reaction to produce a method.

Specifically, the polycondensation reaction is carried out, for example, by using a diamine component and a tetracarboxylic acid diester in the presence of a condensing agent, a base and a solvent at 0 to 150 ° C (preferably 0 to 100 ° C) for 30 minutes. A method of reacting for 24 hours (preferably 3 to 15 hours).

As the condensing agent, triphenylphosphite, dicyclohexylcarbonyldiimide, 1-ethyl-3-(3-dimethylaminopropyl)carbonyldiimide hydrochloride, N can be used. , N'-carbonyldiimidazole, dimethoxy-1,3,5-three Methylmorpholine, O-(benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium tetrafluoroborate, O-(benzotriazol-1-yl -N,N,N',N'-tetramethyluron hexafluorophosphite, diphenyl (2,3-dihydro-2-thioxo-3-benzoxazolyl)phosphonate, and the like. The amount of the condensing agent used is preferably 2 to 3 moles per mole of the tetracarboxylic acid diester, particularly preferably 2 to 2.5 moles.

As the base, a tertiary amine such as pyridine or triethylamine can be used. The amount of the base to be used is preferably an amount which can be easily removed after the above polycondensation reaction, and is generally preferably 2 to 4 times moles, more preferably 2 to 3 times moles, relative to the diamine component.

The solvent used in the above polycondensation reaction, the resulting polymerization The solvent, the solvent used for the reaction of the above-mentioned diamine component and the tetracarboxylic acid component, etc. are mentioned. Among them, N,N-dimethylformamide, N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone or γ-butyrolactone is preferred. These solvents may be used alone or in combination of two or more.

Further, in the above polycondensation reaction, when Lewis acid is used as an additive, the reaction can be efficiently carried out. Lewis acid is preferably lithium halide such as lithium chloride or lithium bromide. The amount of Lewis acid used is preferably 0.1 to 10 times the molar amount of the diamine component. In particular, it is preferably 2.0 to 3.0 times Mo.

In the case where the polyalkyl amide is obtained from the solution of the polyalkyl amide obtained by the above methods (1) to (3), the reaction solution may be added to a solvent to precipitate. Examples of the solvent used for the precipitation include water, methanol, ethanol, 2-propanol, hexane, cellosolve, acetone, toluene, and the like. The polymer precipitated after the solvent is added is preferably used for the purpose of removing the above-mentioned additives, catalysts, and the like, and performing a plurality of washing operations using the above solvent. After being recovered by filtration, it is dried at normal temperature or under reduced pressure under normal pressure or reduced pressure. Further, the polymer recovered after the precipitation can be reduced in the polymer by repeating the re-dissolution in the solvent and reprecipitation recovery after 2 to 10 repetitions. The solvent at this time, for example, a solvent in which the polymer is dissolved, or the like.

The polyalkyl amide of the present invention is preferably produced by the method of the above (1) or (2) in the method for producing the polyalkyl amide of the above (1) to (3).

<Liquid alignment agent>

The liquid crystal alignment agent of the present invention is a coating solution used to form a liquid crystal alignment film (also referred to as a resin film), which is a liquid crystal alignment film containing a specific polymer (A), a specific polymer (B), and a solvent. The coating solution used.

The ratio of the specific polymer (B) in the liquid crystal alignment agent is preferably 10 to 900 parts by mass, more preferably 25 to 400 parts by mass, and 40 to 250 parts by mass based on 100 parts by mass of the specific polymer (A). The portion is particularly good, and the best is 60 to 160 parts by mass.

In the liquid crystal alignment agent of the present invention, all of the polymer components may be a specific polymer (A), a specific polymer (B), or a polymer other than the above. Other polymers other than these are, for example, polyimine precursors and polyimine which do not have a specific structure (1A), a specific structure (1B), and a specific structure (2). Further, it is also a cellulose-based polymer, an acrylic polymer, a methacrylic polymer, polystyrene, polyamine or polyoxyalkylene. In this case, the content of the polymer other than the above is preferably 0.5 to 15 parts by mass, particularly 1 to 10, based on 100 parts by mass of the total of the specific polymer (A) and the specific polymer (B). The quality is preferred.

Further, the content of the solvent in the liquid crystal alignment agent is preferably from 70 to 99.9% by mass. The content can be appropriately changed depending on the coating method of the liquid crystal alignment agent or the film thickness of the intended liquid crystal alignment film.

The solvent used in the liquid crystal alignment agent of the present invention is as long as The solvent (also referred to as a good solvent) which can dissolve the specific polymer (A) and the specific polymer (B) is not particularly limited. The following are specific examples of good solvents, but are not limited to the examples.

For example, N,N-dimethylformamide, N,N-dimethylacetamide, N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone, dimethyl Anthracene, γ-butyrolactone, 1,3-dimethyl-tetrahydroimidazolidone, methyl ethyl ketone, cyclohexanone, cyclopentanone or 4-hydroxy-4-methyl-2-pentanone. Among them, N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone, and γ-butyrolactone are preferred.

Further, in the case where the specific polymer (A) and the specific polymer (B) are highly soluble in the solvent, the solvent represented by the above formula [D-1] to the formula [D-3] is preferred.

a good solvent in the liquid crystal alignment agent, which is contained in the liquid crystal alignment agent It is preferably 20 to 99% by mass of the entire solvent. Among them, 20 to 90% by mass is preferred. It is preferably 30 to 80% by mass.

The liquid crystal alignment agent of the present invention can be used as a solvent (also referred to as a poor solvent) for improving the coating property of the liquid crystal alignment film or improving the surface smoothness when the liquid crystal alignment agent is applied, without impairing the effects of the present invention. The following are specific examples of the poor solvent, but are not limited to those exemplified.

For example, ethanol, isopropanol, 1-butanol, 2-butanol, isobutyl Alcohol, tert-butanol, 1-pentanol, 2-pentanol, 3-pentanol, 2-methyl-1-butanol, isoamyl alcohol, tert-pentanol, 3-methyl-2-butanol , neopentyl alcohol, 1-hexanol, 2-methyl-1-pentanol, 2-methyl-2-pentanol, 2-ethyl-1-butanol, 1-heptanol, 2-heptanol, 3-heptanol, 1-octanol, 2-octanol, 2-ethyl-1-hexanol, cyclohexanol, 1-methylcyclohexanol, 2-methylcyclohexanol, 3-methyl ring already Alcohol, 1,2-ethanediol, 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1,4-butyl Alkanediol, 2,3-butanediol, 1,5-pentanediol, 2-methyl-2,4-pentanediol, 2-ethyl-1,3-hexanediol, Dipropyl ether, dibutyl ether, dihexyl ether, dioxane, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, ethylene glycol dibutyl ether, 1,2-butoxy Alkane, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, diethylene glycol methyl ethyl ether, diethylene glycol dibutyl ether, 2-pentanone, 3-pentanone, 2 -Hexanone, 2-heptanone, 4-heptanone, 3-ethoxybutyl acetate, 1-methylpentyl acetate, 2-ethylbutyl acetate, 2-ethylhexyl Acetate, ethylene glycol monoacetate, ethylene glycol diacetate, propylene carbonate, ethyl ether carbonate, 2-(methoxymethoxy)ethanol, ethylene glycol monobutyl ether, Ethylene glycol monoisoamyl ether, ethylene glycol monohexyl ether, 2-(hexyloxy)ethanol, decyl alcohol, diethylene glycol, propylene glycol, propylene glycol monobutyl ether, 1-(butoxyethoxy)propyl Alcohol, propylene glycol monomethyl ether acetate, dipropylene glycol, dipropylene Alcohol monomethyl ether, dipropylene glycol monoethyl ether, dipropylene glycol dimethyl ether, tripropylene glycol monomethyl ether, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, B Glycol monobutyl ether acetate, ethylene glycol monoacetate, ethylene glycol diacetate, diethylene glycol monoethyl ether acetate, diethylene glycol monobutyl ether acetate, 2-(2-ethoxyethoxy)ethyl acetate, diethylene glycol acetate, triethylene glycol, triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, lactic acid Methyl ester, ethyl lactate, methyl acetate, ethyl acetate, n-butyl acetate, propylene glycol monoethyl ether, methyl pyruvate, ethyl pyruvate, methyl 3-methoxypropionate, 3- Methyl ethyl ethoxypropionate, ethyl 3-methoxypropionate, 3-ethoxypropionic acid, 3-methoxypropionic acid, 3-methoxypropane Acid propyl ester, butyl 3-methoxypropionate, methyl lactate, ethyl lactate, n-propyl lactate, n-butyl lactate, isoamyl lactate or the above formula [D-1]~[D -3] The solvent shown and the like.

Among them, 1-hexanol, cyclohexanol, 1,2-ethanediol, 1,2-propanediol, propylene glycol monobutyl ether, ethylene glycol monobutyl ether or dipropylene glycol dimethyl is used. Ether is preferred.

The amount of the poor solvent is preferably from 1 to 80% by mass based on the total amount of the solvent containing the liquid crystal alignment agent, preferably from 10 to 80% by mass, particularly preferably from 20 to 70% by mass.

In the liquid crystal alignment agent of the present invention, the introduction has an epoxy a cross-linking compound of a group, an isocyanate group, an oxocyclobutane group or a cyclocarbonate group, or a substituent having at least one selected from the group consisting of a hydroxyl group, a hydroxyalkyl group and a lower alkoxyalkyl group A linking compound or a crosslinkable compound having a polymerizable unsaturated bond is preferred. These substituents or polymerizable unsaturated bonds must have two or more of the crosslinkable compounds.

a crosslinkable compound having an epoxy group or an isocyanate group, for example, bisphenol acetone glycidyl ether, phenol novolak epoxy resin, cresol novolac epoxy resin, triglycidyl isocyanurate, four Glycidylamine diphenyl, tetraglycidyl-m-xylylenediamine, tetraglycidyl-1,3-bis(aminoethyl)cyclohexane, tetraphenyl glycidyl ether ethane, triphenyl Glycidyl ether ethane, bisphenol hexafluoroacetic acid diglycidyl ether, 1,3-bis(1-(2,3-epoxypropoxy)-1-trifluoromethyl-2,2,2- Trifluoromethyl)benzene, 4,4-bis(2,3-epoxypropoxy)octafluorobiphenyl, triglycidyl-p-aminophenol, tetraglycidyl metaxylenediamine, 2- (4-(2,3-epoxy) Propoxy)phenyl)-2-(4-(1,1-bis(4-(2,3-epoxypropoxy)phenyl)ethyl)phenyl)propane or 1,3-double ( 4-(1-(4-(2,3-epoxypropoxy)phenyl)-1-(4-(1-(4-(2,3-epoxypropoxy)phenyl)-1 -Methylethyl)phenyl)ethyl)phenoxy)-2-propanol and the like.

a crosslinkable compound having an oxycyclobutane group, having at least There are two crosslinkable compounds of the oxycyclobutane group represented by the following formula [4A].

Specifically, a crosslinkable compound represented by the formula [4a] to the formula [4k] disclosed in 58-59 of the International Publication No. WO2011/132751 (2011.10.27) is mentioned.

The crosslinkable compound having a cyclic carbonate group is a crosslinkable compound having at least two cyclic carbonate groups represented by the following formula [5A].

Specifically, a crosslinkable compound represented by the formula [5-1] to the formula [5-42] disclosed in pages 76 to 82 of the International Publication WO2012/014898 (published in 2012.2.2) is exemplified.

A crosslinkable compound having at least one substituent selected from the group consisting of a hydroxyl group and an alkoxy group, for example, an amine-based resin having a hydroxyl group or an alkoxy group, for example, a melamine resin, a urea resin, or a hydrazine Resin, acetylene urea-formaldehyde resin, succinimide-formaldehyde resin or ethylene urea-formaldehyde resin. Specifically, for example, a melamine derivative in which an amino group hydrogen atom is substituted with a methylol group or an alkoxymethyl group or both, a benzofluorene can be used. Derivative, or acetylene urea. The melamine derivative or benzopyrene The derivative may exist in the form of a dimer or a trimer. Each of these three The ring is preferably one having 3 or more and 6 or less hydroxymethyl groups or alkoxymethyl groups.

These melamine derivatives or benzopyrene Examples of derivatives, for example, each of the three commercially available products The ring is an average of 3.7 methoxymethyl groups replaced by MX-750, each three The ring is MW-30 (manufactured by the above, Sanwa Chemical Co., Ltd.) or SIMEL 300, 301, 303, 350, 370, 771, 325, 327, 703, 712, etc., which are substituted with an average of 5.8 methoxymethyl groups. Methylated melamine, SIMEL 235, 236, 238, 212, 253, 254 and other methoxymethylated butoxymethylated melamine, SIMEL 506, 508 and other butoxymethylated melamine, SIMEL 1141 and other carboxyl groups Methoxymethylated isobutoxymethylated melamine, methoxymethylated ethoxymethylated benzopyrene such as SIMEL 1123 , SIMEL 1123-10 and other methoxymethylated butoxymethylated benzopyrene , butoxymethylated benzopyrene such as SIMEL 1128 , SIMEL 1125-80 and other carboxyl groups contain methoxymethylated ethoxymethylated benzopyrene (above, Mitsui Cyanamide Co., Ltd.), etc. Further, examples of the acetylene urea include butoxymethylated acetylene urea such as SIMEL 1170, methylolated acetylene urea such as SIMEL 1172, and methoxymethylolated acetylene urea such as POWERLINK 1174.

a benzene or phenolic compound having a hydroxyl group or an alkoxy group, for example, 1,3,5- Tris(methoxymethyl)benzene, 1,2,4-tris(isopropoxymethyl)benzene, 1,4-bis(sec-butoxymethyl)benzene or 2,6-dihydroxymethyl Base-p-tert-butylphenol and the like.

More specifically, a cross-linking compound represented by the formula [6-1] to the formula [6-48] disclosed in pages 62 to 66 of International Publication WO2011/132751. (2011.10.27) is mentioned. Wait.

a crosslinkable compound having a polymerizable unsaturated bond, for example For example, there are three trimethylolpropane tri(meth)acrylates, pentaerythritol tri(meth)acrylate, dipentaerythritol penta(meth)acrylate, tris(meth)acryloyloxyethoxylate in the molecule. a crosslinkable compound of a polymerizable unsaturated group such as a trimethylolpropane or a glycerol polyglycidyl ether poly(meth)acrylate, or, for example, two ethylene glycol di(methyl) groups in the molecule. Acrylate, diethylene glycol di(meth)acrylate, tetraethylene glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, propylene glycol di(meth)acrylate, polypropylene glycol Di(meth)acrylate, butanediol di(meth)acrylate, neopentyl glycol di(meth)acrylate, ethylenoxide bisphenol A di(meth)acrylate, exfoliation Base oxide bisphenol type di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, glycerol di(meth)acrylate, pentaerythritol di(meth)acrylate, Ethylene glycol diglycidyl ether di(meth) acrylate, diethylene glycol diglycidyl ether di(meth) acrylate, diglycidyl phthalate di(methyl) a crosslinkable compound of a polymerizable unsaturated group such as acrylate or hydroxy-t-valeric acid neopentyl glycol di(meth)acrylate, and further, such as 2-hydroxyethyl group having one in the molecule Base (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 2-phenoxy-2-hydroxypropyl (meth) acrylate, 2-(Meth)acryloyloxy-2-hydroxypropyl phthalate, 3-chloro-2-hydroxypropyl (meth) acrylate, glycerol mono(meth) acrylate, 2- A crosslinkable compound of a polymerizable unsaturated group such as (meth)acryloyloxyethyl phosphate or N-methylol (meth) acrylamide.

Further, a compound represented by the following formula [7A] can also be used.

(In the formula [7A], E ₁ represents a group consisting of a cyclohexane ring, a bicyclohexane ring, a benzene ring, a biphenyl ring, a biphenyl ring, a naphthalene ring, an anthracene ring, an anthracene ring or a phenanthrene ring; The selected group, E ₂ represents a group selected by the following formula [7a] or formula [7b], and n represents an integer of 1 to 4).

The above compound is exemplified as one of the crosslinkable compounds, but is not limited to these contents. Further, the crosslinkable compound to be used in the liquid crystal alignment agent of the present invention may be one type or a combination of two or more types.

In the liquid crystal alignment agent of the present invention, the crosslinkable compound is contained Amount, relative to 100 parts by mass of all polymer components, from 0.1 to 150 The amount is preferred. Among them, the purpose of the crosslinking reaction can be effectively carried out, and it is preferably 0.1 to 100 parts by mass based on 100 parts by mass of the total polymer component. It is preferably 1 to 50 parts by mass.

In the liquid crystal alignment agent of the present invention, a compound which is improved in film thickness uniformity or surface smoothness of the liquid crystal alignment film when the liquid crystal alignment agent is applied can be used without departing from the effects of the present invention.

Improve film thickness uniformity or surface smoothness of liquid crystal alignment film Examples of the compound include a fluorine-based surfactant, a polyfluorene-based surfactant, and a nonionic surfactant.

More specifically, for example, F-TOP EF301, EF303, EF352 (above, manufactured by Dow Chemical Co., Ltd.), Megfried F171, F173, R-30 (above, manufactured by Dainippon Paint Co., Ltd.), Fluordo FC430, FC431 (above, Sumitomo 3M), AsahiGuard AG710, Shaflon S-382, SC101, SC102, SC103, SC104, SC105, SC106 (above, manufactured by Asahi Glass Co., Ltd.).

The use ratio of the surfactant is preferably 0.01 to 2 parts by mass, more preferably 0.01 to 1 part by mass, per 100 parts by mass of the total polymer component contained in the liquid crystal alignment agent.

Further, in the liquid crystal alignment agent of the present invention, a compound which promotes charge transfer in the liquid crystal alignment film and promotes charge dissociation of the element can be added, for example, from pages 69 to 73 of International Publication WO2011/132751 (2011.10.27 publication). A nitrogen-containing heterocyclic amine represented by the formula [M1]~[M156] is disclosed. The amine may be directly added to the liquid crystal alignment agent and diluted with a suitable solvent to a solution having a concentration of 0.1 to 10% by mass, preferably 1 to 7% by mass. It is better to add it. The solvent is not particularly limited as long as it can dissolve the specific polymer (A) and the specific polymer (B).

In the liquid crystal alignment agent of the present invention, in addition to the above-mentioned poor solvent, A compound which can increase the film thickness uniformity or surface smoothness of the resin film or the liquid crystal alignment film and a compound which promotes charge dissociation can be added to change the liquid crystal alignment film in addition to the effect of the present invention. A dielectric or conductive material for the purpose of electrical properties such as electrical coefficient or electrical conductivity.

<Liquid alignment film ‧ Liquid crystal display element>

The liquid crystal alignment film of the present invention is a film obtained by applying the liquid crystal alignment agent to a substrate, drying and sintering. The substrate to which the liquid crystal alignment agent of the present invention is applied is not particularly limited as long as it is a substrate having high transparency, and a plastic such as an acrylic substrate or a polycarbonate substrate may be used in addition to the glass substrate or the tantalum nitride substrate. Substrate, etc. In this case, when a substrate such as an ITO electrode used for driving the liquid crystal is formed, it is preferable from the viewpoint of simplifying the process. Further, in the reflective liquid crystal display device, when it is only a single-sided substrate, an opaque object such as a germanium wafer may be used. In this case, a material that reflects light such as aluminum may be used.

There is no special limitation on the coating method of liquid crystal alignment agent. Industrially, it can be generally carried out by methods such as screen printing, lithography, flexo printing or inkjet printing. Other coating methods, for example, a dipping method, a roll coating method, a slit coating method, a spin coater method, or a spray method, etc., can be used for the purpose desired.

After the liquid crystal alignment agent is applied onto the substrate, the solvent is evaporated by a heating means such as a hot plate, a heat cycle type oven, or an IR (infrared) type oven to form a liquid crystal alignment film. The drying and sintering steps of the present invention after coating the liquid crystal alignment agent may be selected to any temperature and time. Generally, in order to sufficiently remove the solvent contained, it is generally sintered at 50 to 120 ° C for 1 minute to 10 minutes, and then at 150 to 300 ° C for 5 minutes to 120 minutes. The thickness of the liquid crystal alignment film after sintering is not particularly limited. When the thickness is too thin, the reliability of the liquid crystal display element may be lowered. Therefore, it is preferably 5 nm to 300 nm. Among them, 10 nm to 200 nm is preferred.

A method of performing alignment treatment on the obtained liquid crystal alignment film, for example, the above-described rubbing treatment method, optical alignment treatment method, or the like.

Specific examples of the light alignment processing method include, for example, The radiation direction of the liquid crystal alignment film is irradiated to the surface of the liquid crystal alignment film, and depending on the case, it may be heat-treated at a temperature of 150 to 250 ° C to impart liquid crystal alignment (also referred to as liquid crystal alignment ability). For radiation, ultraviolet or visible light having a wavelength of 100 to 800 nm can be used. Among them, ultraviolet rays having a wavelength of 100 to 400 nm are preferred, and ultraviolet rays having a wavelength of 200 to 400 nm are preferred.

Further, from the viewpoint of improving the liquid crystal alignment property, the substrate coated with the liquid crystal alignment film may be heated at 50 to 250 ° C to irradiate the radiation. Further, the irradiation amount of the radiation is preferably 1 to 10,000 mJ/cm ² . Among them, it is preferably 100 to 5,000 mJ/cm ² . The liquid crystal alignment film produced in this manner allows the liquid crystal molecules to be stably aligned in a certain direction.

Further, in the above method, the liquid crystal alignment film which irradiates the polarized radiation may be subjected to a contact treatment using water or a solvent. The solvent to be used in the contact treatment is not particularly limited as long as it dissolves a solvent which is irradiated with radiation and is decomposed by the liquid crystal alignment film. Specifically, for example, water, methanol, ethanol, 2-propanol, acetone, methyl ethyl ketone, 1-methoxy-2-propanol, 1-methoxy-2-propanol acetate, butyl cellosolve (cellosolve), ethyl lactate, methyl lactate, diacetone alcohol, methyl 3-methoxypropionate, ethyl 3-ethoxypropionate, propyl acetate, butyl acetate or cyclohexyl acetate. Among them, water, 2-propanol, 1-methoxy-2-propanol or ethyl lactate is preferred from the viewpoint of versatility or safety of a solvent. Preferred is water, 1-methoxy-2-propanol or ethyl lactate. These solvents may be used alone or in combination of two or more.

The aforementioned contact treatment in the present invention, that is, using water or dissolved The treatment of the liquid crystal alignment film or the like which irradiates the polarized radiation may be performed by immersion treatment or spray treatment (also referred to as SPRAY treatment). The treatment time in these treatments can efficiently decompose the decomposition product generated by the liquid crystal alignment film by the irradiation radiation, and it is preferably from 10 seconds to 1 hour. Among them, it is preferably immersed in 1 minute to 30 minutes. Further, the solvent in the contact treatment may be normal temperature or heating, and preferably 10 to 80 °C. Among them, 20~50 °C is preferred. Further, from the viewpoint of the solubility of the decomposition product, ultrasonic treatment or the like may be performed as necessary.

After the above contact treatment, it is preferred to carry out water washing (also referred to as washing) or sintering of the liquid crystal alignment film using a low boiling point solvent such as water, methanol, ethanol, 2-propanol, acetone or methyl ethyl ketone. At this point, it can be washed and Any of the sintering, or both. The sintering temperature is preferably 150 to 300 ° C. Among them, 180~250 °C is preferred. It is preferably 200 to 230 °C. Further, the sintering time is preferably from 10 seconds to 30 minutes. Among them, it takes 1 minute to 10 minutes.

The liquid crystal alignment film of the invention is suitable for use as an IPS side A liquid crystal alignment film of a liquid crystal display element of a horizontal electric field type such as an FFS type or the like is particularly useful as a liquid crystal alignment film of an FFS type liquid crystal display element.

The liquid crystal display element of the present invention is a liquid crystal display element obtained by producing a liquid crystal cell by a known method, and a liquid crystal display element obtained by using the liquid crystal cell obtained by the liquid crystal alignment film of the present invention.

One of the methods for fabricating a liquid crystal cell is exemplified by a liquid crystal display device having a passive matrix structure. Further, it is also possible to use a liquid crystal display element having an active matrix structure in which a response element such as a TFT (Thin Film Transistor) is provided on each pixel portion constituting the image display.

Specifically, in order to prepare a transparent glass substrate, a common electrode is provided on one of the substrates, and a segment electrode is provided on the other substrate. These electrodes can be patterned, for example, as an ITO electrode to obtain a desired image display. Next, an insulating film covering the common electrode and the segment electrode may be provided on each of the substrates. As the insulating film, for example, a film formed of SiO ₂ -TiO ₂ formed by a sol-gel method can be used. Next, according to the above conditions, a liquid crystal alignment film is formed on each of the substrates, and the substrate on one side and the other substrate are superposed on each other with the liquid crystal alignment film surface facing each other, and a sealant is used in the periphery. The sealant, in view of controlling the gap of the substrate, is usually mixed with a spacer. Further, it is preferable to use a spacer for controlling the gap of the substrate in the inner portion of the surface on which the sealant is not provided. One part of the sealant is provided with an opening portion which can be filled with liquid crystal externally.

Thereafter, the liquid crystal material is injected into the space surrounded by the two substrates and the sealant through the opening provided in the sealant. Thereafter, the opening is sealed with an adhesive. The injection method may be a vacuum injection method or a capillary phenomenon in the atmosphere. As the liquid crystal material, either a positive liquid crystal material or a negative liquid crystal material can be used. Subsequently, the setting of the polarizing plate is performed. Specifically, a pair of polarizing plates are bonded to the surface opposite to the liquid crystal layer of the two substrates.

As described above, when the liquid crystal alignment agent of the present invention is used, it is possible to suppress the afterimage caused by the AC driving, and to have a sealant and a liquid crystal alignment film which is adherent to the underlying substrate. In particular, a liquid crystal alignment film for a photo-alignment treatment method which is obtained by irradiating a polarized radiation is useful.

[Examples]

The invention will be described in more detail below by way of examples, but not limited thereto. The abbreviations used below have the following meanings.

(specific diamine (1))

1A: a diamine represented by the following formula [1A]

(specific diamine (2))

2A: a diamine represented by the following formula [2A]

(specific 2nd diamine)

3A: p-phenylenediamine

3B: a diamine represented by the following formula [3B]

(other diamines)

4A: p-phenylenediamine

(specific tetracarboxylic acid component)

C1: 1,3-dimethyl-1,2,3,4-cyclobutane tetracarboxylic dianhydride

C2: 1,2,3,4-cyclobutane tetracarboxylic dianhydride

C3: 3,3',4,4'-biphenyltetracarboxylic dianhydride

C4: a dicarboxylic acid dialkylate dihalide compound represented by the following formula [C4]

(solvent)

NMP: N-methyl-2-pyrrolidone

NEP: N-ethyl-2-pyrrolidone

γ-BL: γ-butyrolactone

BCS: butyl cellosolve (cellosolve)

PB: propylene glycol monobutyl ether

"Measurement of molecular weight of polyamidene-based polymers"

The molecular weight of the polyimine precursor and the polyimine is a normal temperature gel permeation chromatography (GPC) device (GPC-101) (manufactured by Showa Denko Co., Ltd.) and a column (KD-803, KD-805). (manufactured by Shodex Co., Ltd.), measured as follows.

Column temperature: 50 ° C

Dissolution: N,N'-dimethylformamide (additive, lithium bromide-water (LiBr‧H ₂ O) is 30 mmol/L (liter), phosphoric acid ‧ anhydrous crystal (o-phosphoric acid) is 30 mmol/ L, tetrahydrofuran (THF) is 10ml / L)

Flow rate: 1.0ml/min

Standard sample for the production of calibration lines: TSK standard polyethylene oxide (molecular weight; about 900,000, 150,000, 100,000 and 30,000) (made by Tosoh Corporation) and polyethylene glycol (molecular weight; about 12,000, 4,000 and 1,000) (manufactured by Polymer Laboratories).

"Determination of the imidization rate of polyamidiamine"

The imidization ratio of polyimine was measured in the following manner. 20 mg of polyimine powder was placed in an NMR (nuclear magnetic resonance) sample tube (NMR standard sampling tube, 5 (manufactured by Kusano Scientific Co., Ltd.)) A solution of dimethyl hydrazine (DMSO-d6, 0.05% by mass of TMS (tetramethyl decane)) (0.53 ml) was added thereto, and ultrasonic waves were applied thereto to completely dissolve. This solution was measured for proton NMR at 500 MHz using an NMR measuring machine (JNW-ECA500) (manufactured by JEOL Ltd.). The imidization rate of ruthenium is determined by using protons generated by structures that have not changed before and after imidization as a reference proton. The calculated peak value of this proton is used, and the proline is present near 9.5 ppm to 10.0 ppm. The calculated value of the proton peak generated by the NH group is obtained by the following formula.

醯 imidization rate (%) = (1-α.x/y) × 100

In the above formula, x is a calculated value of a proton peak derived from an NH group of a proline, y is a calculated peak of a reference proton, and α is a polylysine (a sulfhydrylation ratio of 0%), and is relatively The ratio of the number of reference protons to the NH proton of one proline.

"Synthesis of Polyimine Polymers" <Synthesis Example 1>

3A (2.92g, 27.0mmol) and 1A (0.71g, 2.99mmol) were weighed in a 100 mL four-necked flask equipped with a stirring device and a nitrogen introduction tube, and NMP (81.8 g) was added thereto, and continuously fed with nitrogen gas. Stir to dissolve. The diamine solution was continuously stirred, and C1 (6.46 g, 28.8 mmol) was added thereto, and NMP was added thereto to have a solid concentration of 10% by weight, and the mixture was stirred at 25 ° C for 4 hours to obtain a polyamic acid solution (1). The polyamic acid solution had a viscosity of 230 mPa ‧ at a temperature of 25 ° C. Further, the polyamine has a number average molecular weight (Mn) of 11,100 and a weight average molecular weight (Mw) of 30,000.

<Synthesis Example 2>

4A (2.27 g, 21.0 mmol) and 2A (2.69 g, 9.02 mmol) were weighed in a 100 mL four-necked flask equipped with a stirring device and a nitrogen introduction tube, and NMP (61.9 g) was added thereto, and continuously fed with nitrogen gas. Stir to dissolve. The diamine solution was continuously stirred, and C2 (5.59 g, 28.5 mmol) was added thereto, and NMP was added thereto to have a solid concentration of 12% by weight, and the mixture was stirred at 25 ° C for 4 hours to obtain a polyamic acid solution (2). The gathering The viscosity of the amine acid solution at a temperature of 25 ° C was 410 mPa ‧ s. Further, the polyamic acid had an Mn of 9,000 and a Mw of 20,000.

<Synthesis Example 3>

2A (5.97 g, 20.0 mmol) was weighed in a 100 mL four-necked flask equipped with a stirring device and a nitrogen introduction tube, and NMP (75.9 g) was added thereto, and the mixture was continuously stirred and dissolved in nitrogen gas to dissolve. The diamine solution was continuously stirred, and C3 (5.53 g, 18.8 mmol) was added thereto, and NMP was added thereto to have a solid concentration of 12% by weight, and the mixture was stirred at 25 ° C for 4 hours to obtain a polyamic acid solution (3). The polyamic acid solution has a viscosity of 400 mPa ‧ at a temperature of 25 ° C. Further, the polyamic acid had an Mn of 11,500 and a Mw of 24,400.

<Synthesis Example 4>

In a 500 mL four-necked flask equipped with a stirring apparatus, a nitrogen atmosphere was formed, 3A (2.80 g, 25.9 mmol) was weighed, 1A (1.45 g, 6.47 mmol) was added, and NMP (111 g) and pyridine (6.18 g) were added. , 78.1 mmol), stirred to dissolve. Next, the diamine solution was continuously stirred, and C4 (9.89 g, 30.4 mmol) was added thereto, and the mixture was reacted at 15 ° C for 15 hours. Thereafter, propylene chloride (0.38 g, 4.21 mmol) was added, and the mixture was reacted at 15 ° C for 4 hours. The obtained solution of the polyalkyl amide was poured into water (1230 g) which was stirred, and the precipitated white precipitate was collected by filtration, washed with IPA (isopropanol) (1230 g) for 5 times, and dried to obtain white poly Amino acid amide powder (10.2 g). The polyalkyl amide has an Mn of 20,800 Mw is 41,000.

The obtained polyalkyl amide powder (0.80 g) was weighed and placed in a 100 mL Erlenmeyer flask, and γ-BL (7.18 g) was added thereto, and the mixture was stirred at 25 ° C for 24 hours to be dissolved to obtain a polyalkyl amide solution (4). ).

<Synthesis Example 5>

1A (0.47g, 2.00mmol) and 3B (4.40g, 18.0mmol) were weighed in a 100 mL four-necked flask equipped with a stirring device and a nitrogen introduction tube, and NMP (59.5 g) was added thereto, and continuously fed with nitrogen gas. Stir to dissolve. The diamine solution was continuously stirred, and C1 (4.15 g, 18.5 mmol) was added thereto, and NMP was added thereto to have a solid concentration of 10% by weight, and the mixture was stirred at 25 ° C for 4 hours to obtain a polyaminic acid solution (5). The polyamic acid solution had a viscosity of 210 mPa ‧ at a temperature of 25 ° C. Further, the polyamic acid had an Mn of 11,200 and a Mw of 23,400.

<Synthesis Example 6>

In the polyamic acid solution (5) (66.0 g) obtained by the synthesis method of Synthesis Example 5, after adding NEP to dilute to 9 mass%, acetic anhydride (5.38 g) as a ruthenium catalyst was added and Pyridine (1.39 g) was reacted at 60 ° C for 3 hours. The reaction solution was poured into methanol (360 ml), and the resulting precipitate was filtered. This precipitate was washed with methanol, and dried under reduced pressure at 60 ° C to obtain a polyimine powder (6). The polyimide imidization ratio of this polyimine was 75%, Mn was 10,100, and Mw was 20,500.

<Synthesis Example 7>

3A (2.16 g, 20.0 mmol) was weighed in a 100 mL four-necked flask equipped with a stirring device and a nitrogen introduction tube, and NMP (31.6 g) was added thereto, and the mixture was continuously stirred and supplied with nitrogen to be dissolved. The diamine solution was continuously stirred, and C1 (4.21 g, 18.8 mmol) was added thereto, and NMP was added thereto to have a solid concentration of 10% by weight, and the mixture was stirred at 25 ° C for 4 hours to obtain a polyamic acid solution (7). The polyamic acid solution has a viscosity of 250 mPa ‧ at a temperature of 25 ° C. Further, the polyamic acid had an Mn of 11,500 and a Mw of 24,400.

<Synthesis Example 8>

In a 100 mL four-necked flask equipped with a stirring device and a nitrogen introduction tube, C2 (3.92 g, 20.0 mmol) was weighed, NMP (55.8 g) was added, and 4A (2.09 g, 19.3 mmol) was added while stirring under a nitrogen atmosphere. Further, NMP was further added so that the solid content concentration was 8% by weight, and the mixture was stirred at 25 ° C for 4 hours to obtain a polyamic acid solution (8). The polyamic acid solution had a viscosity of 300 mPa ‧ at a temperature of 25 ° C. Further, this polyamic acid had an Mn of 11,000 and a Mw of 23,200.

The polyimine-based polymer system is shown in Table 2.

"Manufacture of liquid crystal alignment agent"

The following Examples 1 to 5 and Comparative Examples 1 to 4 are examples of production of a liquid crystal alignment agent. Further, the liquid crystal alignment agent is also used for evaluation. The liquid crystal alignment agent is shown in Tables 3 and 4.

Using the liquid crystal alignment agents obtained in the examples and the comparative examples, "the evaluation of the afterimage due to the AC drive (the FFS liquid crystal cell)" and "the evaluation of the sealant and the adhesion to the underlying substrate" were performed.

"Evaluation of residual images caused by AC drive (FCS liquid crystal cell)"

The liquid crystal alignment agent obtained in the examples and the comparative examples was filtered using a 1.0 μm filter, and then a liquid crystal alignment agent was applied onto a glass substrate on which an FFS driving electrode was formed by spin coating, and the substrate had a film thickness of 50 nm. The ITO electrode was formed as an electrode of the first layer, and an insulating film of the second layer was formed of tantalum nitride having a thickness of 500 nm, and an ITO electrode having a serrated shape (electrode width: 3 μm, electrode spacing: 6 μm, electrode height: 50 nm) Formed as the electrode of the third layer. Thereafter, the film was dried on a hot plate at 80 ° C for 5 minutes, and then sintered in a hot air circulating oven at 250 ° C for 60 minutes to form a coating film having a film thickness of 100 nm. The surface of the coating film was irradiated with a polarizing plate, and ultraviolet rays of 254 nm were irradiated at 600 mJ/cm ² to prepare a substrate with a liquid crystal alignment film. Further, as a glass substrate having a columnar spacer having a height of 4 μm in which an electrode was not formed on the opposite substrate, a coating film was formed in the same manner, and an alignment treatment was performed.

One of the two substrates is used as a group, and a sealant is printed on the substrate, and the other substrate is bonded so that the alignment direction of the liquid crystal alignment film is 0°, and the sealant is cured to obtain an empty cell. . This empty cell was injected into the liquid crystal MLC-2041 (manufactured by Mok ‧ Japan Co., Ltd.) by a vacuum injection method, and the injection port was sealed to obtain an FFS-driven liquid crystal cell.

The liquid crystal cell was driven using this FFS, and applied at an AC voltage of ±10 V with a frequency of 60 Hz for 120 hours under a constant temperature environment of 60 °C. Thereafter, in a state where a short circuit between the pixel electrode of the liquid crystal cell and the counter electrode is formed, it is left at room temperature for one day.

After being placed, the liquid crystal cell is disposed in a vertical staggered manner between the two polarizing plates, and the backlight is turned on without applying a voltage, and the arrangement angle of the liquid crystal cell is adjusted to transmit light. The brightness is minimal. Subsequently, the rotation angle at which the liquid crystal cell is rotated from the second region of the first pixel to the darkest angle to the darkest angle of the first region is calculated as the angle Δ (°). Similarly to the second pixel, the second region is compared with the first region, and the angle Δ (°) is calculated in the same manner. Then, the average value of the angle Δ(°) of the first pixel and the second pixel is calculated as a liquid crystal cell The angle △ (°).

In the evaluation method, the smaller the value of the angle Δ(°) of the liquid crystal cell, the better the afterimage characteristics due to the AC driving (in Tables 5 and 6, the angle Δ of the liquid crystal cell is shown). )))

In Tables 5 and 6, the results obtained by labeling the examples and the comparative examples are shown.

"Evaluation of Sealant and Adhesion to Substrate"

The liquid crystal alignment agents obtained in the examples and the comparative examples were filtered using a 1.0 μm filter, and then applied by spin coating onto a 30 mm × 40 mm ITO substrate. Thereafter, the film was dried on a hot plate at 80 ° C for 2 minutes, and then sintered in a hot air circulating oven at 230 ° C for 14 minutes to form a coating film having a film thickness of 100 nm. The surface of the coating film was irradiated with ultraviolet rays of 254 nm at 500 mJ/cm ² through a polarizing plate to prepare a substrate with a liquid crystal alignment film. Two substrates with the liquid crystal alignment film were produced.

A 6 μm particle spacer is coated on one side of the substrate, and a sealant (XN-1500T manufactured by Kyoritsu Chemical Co., Ltd.) is printed on the liquid crystal alignment film of the other substrate, and the substrate has a substrate overlap width of 1 cm. The way to fit. At this time, the amount of the sealant was adjusted until the diameter of the sealant after the bonding was 3 mm. The two substrates to be bonded were fixed by a clip, and then heat-hardened at 150 ° C for 1 hour to prepare a test sample substrate for evaluation.

Then, the test sample substrate was placed in a tabletop precision universal testing machine (AGS-X 500N) (manufactured by Shimadzu Corporation), and the end portions of the upper and lower substrates were fixed, and then pressed from the upper portion of the central portion of the substrate, and the measurement was carried out. When peeling off The pressure (N) is the peel pressure (N).

As a result of the evaluation, when the value of the peeling stress (N) is larger, the sealant and the adhesion to the underlying substrate are better (the values of the label peeling stress (N) in Tables 5 and 6).

In Tables 5 and 6, the results obtained by labeling the examples and the comparative examples are shown.

<Example 1>

The polylysine solution (1) (4.95 g) obtained by the synthesis method of Synthesis Example 1 and the polylysine solution obtained by the synthesis method of Synthesis Example 2 were weighed in a 20 ml sample tube provided with a stirrer (2). (2.68 g), NMP (4.37 g) and BCS (3.00 g) were added, and stirred with a magnetic stirrer for 30 minutes to obtain a liquid crystal alignment agent (1). In the liquid crystal alignment agent, an abnormal phenomenon such as turbidity or precipitation was not observed, and it was confirmed to be a homogeneous solution.

Using the obtained liquid crystal alignment agent (1), "evaluation of residual image due to AC driving (FCS liquid crystal cell)" and "evaluation of sealant and adhesion to the underlying substrate" were performed.

<Example 2>

The polyaminic acid solution (1) (4.98 g) obtained by the synthesis method of Synthesis Example 1 and the polylysine solution obtained by the synthesis method of Synthesis Example 3 were weighed in a 20 ml sample tube provided with a stirrer (3). (2.72 g), NEP (4.29 g) and BCS (3.00 g) were added, and stirred with a magnetic stirrer for 30 minutes to obtain a liquid crystal alignment agent (2). In the liquid crystal alignment agent, no abnormality such as turbidity or precipitation was observed, and it was confirmed to be a homogeneous solution.

Using the obtained liquid crystal alignment agent (2), "evaluation of residual image due to AC driving (FCS liquid crystal cell)" and "evaluation of sealant and adhesion to the underlying substrate" were performed.

<Example 3>

The polyamic acid solution (1) (3.50 g) obtained by the synthesis method of Synthesis Example 1 and the polyamic acid solution obtained by the synthesis method of Synthesis Example 2 were weighed in a 50 ml sample tube equipped with a stirrer (2). (2.33 g), NMP (12.8 g) and PB (4.66 g) were added, and stirred with a magnetic stirrer for 30 minutes to obtain a liquid crystal alignment agent (3).

The obtained liquid crystal alignment agent (3) was pressure-filtered using a membrane filter having a pore diameter of 1 μm to evaluate inkjet coating properties. The inkjet coater was HIS-200 (manufactured by Hitachi Plant Technologies Co., Ltd.). The coating was applied to a substrate cleaned with pure water and IPA at a coating area of 70×70 mm, a nozzle pitch of 0.423 mm, a scanning pitch of 0.5 mm, a coating speed of 40 mm/sec, and coating to The time until pre-drying was 60 seconds, and pre-drying was performed on a hot plate at 70 ° C for 5 minutes. Further, the substrate is a substrate using the conditions of "the evaluation of the afterimage due to the AC drive (the FFS liquid crystal cell)" and the "evaluation of the sealant and the adhesion to the underlying substrate".

The coating property of the substrate with the obtained liquid crystal alignment film was confirmed. Specifically, the coating film was visually observed under a sodium lamp to confirm whether it had sand holes. As a result, no sand holes were observed on the coating film, and a liquid crystal alignment film having excellent coating properties was obtained.

Further, using the substrate with the obtained liquid crystal alignment film, the "evaluation of the afterimage due to the AC drive (the FFS liquid crystal cell)" and "the evaluation of the sealant and the adhesion to the underlying substrate" are used. Conditions, carry out various assessments.

<Example 4>

The polyamic acid solution (4) (3.75 g) obtained by the synthesis method of Synthesis Example 4 and the polyamic acid solution obtained by the synthesis method of Synthesis Example 2 were weighed in a 20 ml sample tube provided with a stirrer ( 2) (2.50 g), NMP (2.72 g), γ-BL (0.87 g), and BCS (2.46 g) were added, and stirred with a magnetic stirrer for 30 minutes to obtain a liquid crystal alignment agent (4). In the liquid crystal alignment agent, no abnormality such as turbidity or precipitation was observed, and it was confirmed to be a homogeneous solution.

Using the obtained liquid crystal alignment agent (4), "evaluation of residual image due to AC driving (FCS liquid crystal cell)" and "evaluation of sealant and adhesion to the underlying substrate" were performed.

<Example 5>

NMP (2.12 g) and NEP (4.60 g) were added to a polyhydrazide powder (6) (0.38 g) obtained by the synthesis method of Synthesis Example 6 in a 20 ml sample tube provided with a stirrer at 70 ° C. The mixture was stirred for 24 hours to dissolve. To the solution, a polyamic acid solution (3) (2.10 g) and BCS (2.30 g) obtained by the synthesis method of Synthesis Example 3 were added, and the mixture was stirred at 40 ° C for 4 hours to obtain a liquid crystal alignment agent (5). . In this liquid crystal alignment agent, No abnormalities such as turbidity or precipitation were observed, and it was confirmed to be a homogeneous solution.

Using the obtained liquid crystal alignment agent (5), "evaluation of residual image due to AC driving (FCS liquid crystal cell)" and "evaluation of sealant and adhesion to the underlying substrate" were performed.

<Comparative Example 1>

The polyamic acid solution (1) (8.26 g) obtained by the synthesis method of Synthesis Example 1 was weighed in a 20 ml sample tube equipped with a stirrer, and NMP (3.74 g) and BCS (3.00 g) were added thereto, using magnetic stirring. The mixture was stirred for 30 minutes to prepare a liquid crystal alignment agent (6). In the liquid crystal alignment agent, no abnormality such as turbidity or precipitation was observed, and it was confirmed to be a homogeneous solution.

Using the obtained liquid crystal alignment agent (6), "evaluation of residual image due to AC driving (FCS liquid crystal cell)" and "evaluation of sealant and adhesion to the underlying substrate" were performed.

<Comparative Example 2>

The polyamic acid solution (2) (8.26 g) obtained by the synthesis method of Synthesis Example 2 was weighed in a 20 ml sample tube provided with a stirrer, and NMP (3.75 g) and BCS (3.00 g) were added thereto, using magnetic stirring. The mixture was stirred for 30 minutes to prepare a liquid crystal alignment agent (7). In the liquid crystal alignment agent, no abnormality such as turbidity or precipitation was observed, and it was confirmed to be a homogeneous solution.

Using the obtained liquid crystal alignment agent (7), "evaluation of residual image due to AC driving (FCS liquid crystal cell)" and "evaluation of sealant and adhesion to the underlying substrate" were performed.

<Comparative Example 3>

The polyaminic acid solution (2) (2.66 g) obtained by the synthesis method of Synthesis Example 2 and the polylysine solution obtained by the synthesis method of Synthesis Example 7 were weighed in a 20 ml sample tube provided with a stirrer (7). (4.97 g), NMP (4.36 g) and BCS (3.00 g) were added, and stirred with a magnetic stirrer for 30 minutes to obtain a liquid crystal alignment agent (8). In the liquid crystal alignment agent, no abnormality such as turbidity or precipitation was observed, and it was confirmed to be a homogeneous solution.

Using the obtained liquid crystal alignment agent (8), "evaluation of residual image due to AC driving (FCS liquid crystal cell)" and "evaluation of sealant and adhesion to the underlying substrate" were performed.

<Comparative Example 4>

The polyamic acid solution (1) (4.97 g) obtained by the synthesis method of Synthesis Example 1 and the polyamic acid solution obtained by the synthesis method of Synthesis Example 5 were weighed in a 20 ml sample tube provided with a stirrer. (2.66 g), NMP (4.36 g) and BCS (3.00 g) were added, and stirred with a magnetic stirrer for 30 minutes to obtain a liquid crystal alignment agent (9). In the liquid crystal alignment agent, no abnormality such as turbidity or precipitation was observed, and it was confirmed to be a homogeneous solution.

Using the obtained liquid crystal alignment agent (9), "evaluation of residual image due to AC driving (FCS liquid crystal cell)" and "evaluation of sealant and adhesion to the underlying substrate" were performed.

*1: The ratio (parts by mass) of the specific polymer (A) to 100 parts by mass of the total polymer.

*2: The ratio (parts by mass) of the specific polymer (B) to 100 parts by mass of the total polymer.

*3: indicates the ratio (parts by mass) of other polymers to 100 parts by mass of the total polymer.

*4: The ratio (parts by mass) of each solvent to 100 parts by mass of the total solvent.

*5: indicates the proportion of the total polymer in the liquid crystal alignment agent.

The meaning of *1~*5 is the same as that of Table 3.

From the above results, the liquid crystal alignment agent of the examples, When the liquid crystal alignment agent of the comparative example was compared, it was confirmed that it had excellent afterimage characteristics due to AC driving, and had a high sealant and adhesion to the underlying substrate.

Specifically, it is a comparison of Example 1 with Comparative Example 1 or Comparative Example 2. In Comparative Example 1 using only the specific polymer (A), when compared with the corresponding examples, it was confirmed that the sealant and the adhesion to the underlying substrate were poor results. Further, in Comparative Example 2 using only the specific polymer (B), the afterimage characteristics due to the AC driving were also poor. In contrast, Example 1 showed excellent results in both of them.

For another example, the ratio of Example 1 to Comparative Example 3 or Comparative Example 4 Compared. Comparative Example 3 using a polymer not containing a specific diamine (1) was confirmed to be inferior to the afterimage characteristics due to AC driving when compared with the corresponding examples. Further, Comparative Example 4 using a polymer containing no specific diamine (1) showed a poor result in terms of the sealant and adhesion to the underlying substrate.

[Industrial use]

A liquid crystal display element having a liquid crystal alignment film obtained by the liquid crystal alignment agent of the present invention is excellent in reliability, and is suitable for a large-screen and high-definition liquid crystal television or a small-sized navigation system or a smart phone.

The entire disclosure of Japanese Patent Application No. 2013-219841, filed on-

Claims (24)

A liquid crystal alignment agent comprising the following (A) component and (B) component; (A) component: at least one selected from the group consisting of the following formulas [1A] and [1B] a polyimine precursor of the structure, and a polymer of at least one selected from the group consisting of the polyimine obtained by hydrazyl imidization of the polyimine precursor; (B) component: a polyimine precursor having a structure of the following formula [2], and a polymer of at least any one selected from the group consisting of polyimine obtained by ruthenium imidization of the polyimine precursor; (In the formula [1A] and the formula [1B], X ^A and X ^C each independently represent a protecting group substituted with a hydrogen atom via heat; X ^B represents a single bond or an organic group having 1 to 40 carbon atoms. The atom to which the ester group (-COO-group) is bonded is a carbon atom) (In the formula [2], Y ¹ and Y ⁷ each independently represent a single bond, an alkyl group having 1 to 10 carbon atoms, -O-, -N(R ¹ )-, -CON(R ² )-, - At least one selected from the group consisting of N(R ³ )CO-, -CH ₂ O-, -COO-, and OCO-; however, R ¹ , R ² , and R ³ each independently represent a hydrogen atom or a carbon number of 1 Y ³ and Y ⁶ represent an alkylene group having 1 to 10 carbon atoms; Y ³ and Y ⁵ each independently represent a hydrogen atom or an alkyl group having 1 to 10 carbon atoms; and Y ⁴ represents an oxygen atom or a sulfur atom. ). The liquid crystal alignment agent of claim 1, wherein at least one of the structures selected by the group of the formula [1A] and the formula [1B] is a formula [1a], a formula [1b] or a formula [ 1c] structure; (In the formula [1a], X ^a represents a hydrogen atom or an organic group having 1 to 20 carbon atoms; X ^b represents a protective group substituted by a hydrogen atom via heat; m represents an integer of 1 or 2; however, the formula [1a] In the case where m is 2, X ^a is a hydrogen atom; in the formula [1b], X ^c represents a protecting group substituted by a hydrogen atom via heat; and in the formula [1c], X ^d represents a single bond or a carbon number. An organic group of 1 to 20, X ^e represents a hydrogen atom or an organic group having 1 to 20 carbon atoms, X ^f represents a protecting group substituted by a hydrogen atom via heat, and n represents an integer of 1 to 4). The liquid crystal alignment agent of claim 2, wherein the component (A) is a composition containing at least one selected from the structures represented by the above formulas [1a], [1b] and [1c] Polymerization of a polydiimide precursor obtained by polycondensation of an amine diamine component with a tetracarboxylic acid component, and polymerization of at least one selected from the polyimine imide obtained by hydrazylation of the polyimide derivative precursor Things. The liquid crystal alignment agent of claim 3, wherein the diamine is a diamine represented by the following formula [1-1]; (In the formula [1-1], X ^D represents an organic group having a carbon number of 5 to 50 having a structure selected from the group consisting of the above formula [1a], the formula [1b], and the formula [1c]. And A ¹ and A ² each independently represent a hydrogen atom or an alkyl group having 1 to 5 carbon atoms). The liquid crystal alignment agent according to claim 4, wherein the diamine is at least one diamine selected from the group consisting of the following formulas [1a-1] to [1c-1]; (In the formula [1a-1], X ¹ represents a single bond, an alkyl group having 1 to 10 carbon atoms, -O-, -N(R ¹ )-, -CON(R ² )-, -N(R). ³ ) at least one organic group selected from CO-, -CH ₂ O-, -COO- and OCO-; however, R ¹ , R ² and R ³ each independently represent a hydrogen atom or an alkyl group having 1 to 3 carbon atoms; X ² represents a single bond, an alkylene group having 1 to 10 carbon atoms, X ^a represents a hydrogen atom or an organic group having 1 to 20 carbon atoms, and X ^b represents a protecting group substituted by a hydrogen atom via heat; m represents An integer of 1 or 2, in which case, when m is 2, X ^a is a hydrogen atom; p represents an integer of 1 to 4, q represents an integer of 1 to 4; and in the formula [1b-1], X ³ and X ⁷ Each independently represents a single bond, an alkylene group having 1 to 10 carbon atoms, -O-, -N(R ¹ )-, -CON(R ² )-, -N(R ³ )CO-, -CH ₂ O -, -COO- and OCO- are at least one selected; however, R ¹ , R ² and R ³ each independently represent a hydrogen atom or an alkyl group having 1 to 3 carbon atoms; and X ⁴ and X ⁶ each independently represent a single bond. Or an alkylene group having 1 to 10 carbon atoms, X ⁵ represents a single bond or an alkylene group having 1 to 10 carbon atoms, X ^c represents a protecting group substituted by a hydrogen atom via heat, and r represents an integer of 1 to 4; In the formula [1c-1], X ⁸ represents an alkyl group having a single bond and a carbon number of 1 to 10 At least one selected from the group consisting of -O-, -N(R ¹ )-, -CON(R ² )-, -N(R ³ )CO-, -CH ₂ O-, -COO-, and OCO-; R ¹ , R ² and R ³ each independently represent a hydrogen atom or an alkyl group having 1 to 3 carbon atoms; X ⁹ represents a single bond, an alkylene group having 1 to 10 carbon atoms, and X ^d represents a single bond or a carbon number of 1~ An organic group of 20, X ^e represents a hydrogen atom or an organic group having 1 to 20 carbon atoms, X ^f represents a protecting group substituted by a hydrogen atom via heat, n represents an integer of 1 to 4, and s represents an integer of 1 to 4 , t represents an integer of 1 to 4, and in the formula [1a-1] to the formula [1c-1], A ¹ to A ⁶ each independently represent a hydrogen atom or an alkyl group having 1 to 5 carbon atoms. The liquid crystal alignment agent of claim 5, wherein the diamine is at least one diamine selected from the group consisting of the following formula [1d-1] to formula [1d-5]; (In the formula [1d-1] to the formula [1d-5], R ¹ to R ⁷ each independently represent at least one selected from the group consisting of the following formulas [a-1] to [a-6]. In the formula [1d-1]~[1d-5], A ¹ to A ¹⁰ each independently represent a hydrogen atom or an alkyl group having 1 to 5 carbon atoms, n1 represents an integer of 0 to 10, and n2 to n3 represents An integer from 1 to 10) (In the formula [a-2], R ¹ represents an alkylene group having 1 to 5 carbon atoms). The liquid crystal alignment agent according to any one of claims 1 to 6, wherein the polymer of the component (B) is a diamine component and a tetracarboxylic acid component containing a diamine having the structure of the above formula [2] a polycondensed polyimide precursor obtained by polycondensation, and a polyimine obtained by imidization of the polyimide precursor At least one polymer selected from the group formed. The liquid crystal alignment agent of claim 7, wherein the diamine is a diamine represented by the following formula [2-1]; (In the formula [2-1], Y ^A represents an organic group having a carbon number of 10 to 50 having a structure represented by the above formula [2], and each of A ¹ and A ² independently represents a hydrogen atom or an alkyl group having 1 to 5 carbon atoms. ). The liquid crystal alignment agent of claim 8, wherein the diamine is a diamine represented by the following formula [2a]; (Y ¹ and Y ⁷ each independently represent a single bond, an alkylene group having 1 to 10 carbon atoms, -O-, -N(R ¹ )-, -CON(R ² )-, -N(R ³ )CO -, -CH ₂ O-, -COO-, and OCO- are at least one selected; however, R ¹ , R ² , and R ³ each independently represent a hydrogen atom or an alkyl group having 1 to 3 carbon atoms; Y ² and Y ⁶ each independently represents an alkylene group having 1 to 10 carbon atoms; Y ³ and Y ⁵ each independently represent a hydrogen atom or an alkyl group having 1 to 10 carbon atoms; Y ⁴ represents an oxygen atom or a sulfur atom, and A ¹ and A ² are each independently Represents a hydrogen atom or an alkyl group having 1 to 5 carbon atoms. The liquid crystal alignment agent according to claim 9, wherein the diamine is at least one selected from the group consisting of the following formulas [2a-1] to [2a-3]; (In the formula [2a-1] to the formula [2a-3], A ¹ to A ⁶ each independently represent a hydrogen atom or an alkyl group having 1 to 5 carbon atoms). The liquid crystal alignment agent according to claim 1 or 2, wherein the polymer of the component (A) is obtained by polycondensation of a diamine component having a diamine represented by the following formula [3-1] and a tetracarboxylic acid component. a polyimine precursor obtained, and a polymer of at least one selected from the polyimine obtained by imidization of the polyimine precursor; (In the formula [3-1], X ^E represents at least one structure selected from the group consisting of the following formula [3a-1] to the formula [3a-9], and A ¹ and A ² each independently represent hydrogen. Atom or an alkyl group having 1 to 5 carbon atoms) (in the formula [3a-9], n represents an integer of 1 to 5). The liquid crystal alignment agent of claim 3 or 4, wherein the tetracarboxylic acid component is a tetracarboxylic acid compound represented by the following formula [4]; (Z represents a structure of at least one selected from the group consisting of the following formulas [4a] to [4q]) (In the formula [4a], Z ¹ to Z ⁴ represent each independently hydrogen atom, methyl group, ethyl group, propyl group, chlorine atom or benzene ring; in the formula [4g], Z ⁵ and Z ⁶ represent each independently hydrogen. Atom or methyl). The liquid crystal alignment agent of claim 12, wherein the tetracarboxylic acid component is such that Z in the above formula [4] is represented by the above formula [4a], formula [4e] to formula [4g], formula [4l], At least one tetracarboxylic acid compound selected from the group consisting of [4m] or formula [4p]. The liquid crystal alignment agent of claim 5 or 6, wherein the polymer of the above component (A), the diamine represented by the above formula [1a-1], the formula [1b-1] and the formula [1c-1], It is 5 to 30 mol% in 100% by mole of the total diamine component. The liquid crystal alignment agent according to claim 9 or 10, wherein, in the polymer of the component (B), the diamine represented by the above formula [2a] is 20 to 100 mol% in 100 mol% of the total diamine component. %. The liquid crystal alignment agent of claim 1 or 2, wherein the polymer of the component (B) is contained in an amount of 40 to 250 parts by mass based on 100 parts by mass of the component (A). The liquid crystal alignment agent of claim 1 or 2, wherein the aforementioned (A) is At least one of the polymer of the component and the component (B) is an alkyl amide. The liquid crystal alignment agent of claim 1 or 2 which is at least selected from the group consisting of N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone and γ-butyrolactone 1 kind of solvent. The liquid crystal alignment agent of claim 1 or 2 which comprises 1-hexanol, cyclohexanol, 1,2-ethanediol, 1,2-propanediol, propylene glycol monobutyl ether, ethylene glycol A solvent selected from the group consisting of monobutyl ether and dipropylene glycol dimethyl ether. The liquid crystal alignment agent of claim 1 or 2, which comprises a crosslinkable compound having an epoxy group, an isocyanate group, an oxycyclobutane group or a cyclic carbonate group, and having a hydroxyl group, a hydroxyalkyl group or a lower alkoxy group At least one selected from the group consisting of a crosslinkable compound of an alkyl group and a crosslinkable compound having a polymerizable unsaturated bond. A liquid crystal alignment film obtained by the liquid crystal alignment agent according to any one of claims 1 to 20. A liquid crystal alignment film obtained by the inkjet method using the liquid crystal alignment agent according to any one of claims 1 to 20. A liquid crystal alignment film obtained by irradiating a liquid crystal alignment film described in claim 21 or 22 with a radiation of polarized light. A liquid crystal display element comprising the liquid crystal alignment film of any one of claims 21 to 23.