TW201829494A - Liquid crystal aligning agent, liquid crystal aligning film, and liquid crystal display element - Google Patents

Abstract

The present invention pertains to a polymer composition containing a copolymer which is obtained from a monomer mixture (A) including a monomer (A-1) and a monomer (A-2), wherein the monomer (A-1) is a monomer having a single cinnamoyl moiety, 2-4 benzene rings which do not constitute the cinnamoyl moiety, and a polymerizable group, and the monomer (A-2) is a monomer having a single cinnamoyl moiety, a benzene ring which does not constitute the cinnamoyl moiety, and a polymerizable group (the cinnamoyl moiety and the benzene ring may have a substituent). The present invention also pertains to a method for producing a substrate having a liquid crystal aligning film, comprising a step for applying the composition to a substrate having an electrically conductive film for horizontal electric field drive to form a coating film, a step for irradiating the obtained coating film with polarized ultraviolet light, and a step for heating the obtained coating film. The liquid crystal aligning agent which employs the polymer composition according to the present invention is highly efficient and is imparted with an alignment control capability, has superior image burn-in characteristics, and can provide a horizontal electric field drive-type liquid crystal display element.

Description

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

[0001] The present invention relates to a novel polymer composition, a liquid crystal alignment film using the same, and a method of producing a substrate having the alignment film. Further, it is a novel method of manufacturing a liquid crystal display element having excellent tilt angle characteristics.

[0002] A liquid crystal display device is known as a lightweight, thin, and low power consumption display device, and has been remarkably developed in recent years for devices used in large-scale television applications. The liquid crystal display element has, for example, a configuration in which a liquid crystal layer is sandwiched between a pair of transparent substrates having electrodes. Further, in the liquid crystal display device, the liquid crystal is an organic film formed of an organic material as a liquid crystal alignment film so that the substrate is in an intended alignment state. [0003] In other words, in the constituent film member of the liquid crystal display device, the liquid crystal is formed on the surface of the substrate on which the liquid crystal is sandwiched, and the liquid crystal is aligned in a specific direction between the substrates. The function. Therefore, in the liquid crystal alignment film, the liquid crystal is required to perform the function of aligning in a certain direction, for example, in addition to the direction in which the substrates are parallel, and the function of controlling the pretilt angle of the liquid crystal is also sought. Further, in the liquid crystal alignment films, the ability to control the alignment of the liquid crystals (hereinafter also referred to as alignment control ability) is performed in such a manner that the organic film constituting the liquid crystal alignment film is subjected to alignment treatment. [0004] An alignment treatment method of a liquid crystal alignment film which can impart an alignment control ability, for example, a conventionally known rubbing method. The rubbing method refers to rubbing (friction) the surface of the organic film such as polyvinyl alcohol or polyamine or polyimine on the substrate by using a cloth such as cotton, nylon or polyester to make the liquid crystal according to the wiping direction. (Friction direction) A method of aligning. Since this rubbing method can easily realize a relatively stable liquid crystal alignment state, it is often used in the manufacturing process of a conventional liquid crystal display element. Therefore, the organic film used for the liquid crystal alignment film is, for example, mainly selected as a polyimide-based organic film having reliability such as heat resistance or excellent electrical properties. [0005] However, the rubbing method of wiping the surface of the liquid crystal alignment film formed by polyimide or the like may cause dust or static electricity. In addition, with the recent increase in the definition of the liquid crystal display element or the unevenness of the electrode on the substrate or the opening and closing active element for driving the liquid crystal, the cloth cannot uniformly wipe the surface of the liquid crystal alignment film, and it is impossible to uniformly wipe the surface of the liquid crystal alignment film. Achieve uniform liquid crystal alignment. [0006] Therefore, regarding the alignment treatment method of other liquid crystal alignment films which do not perform rubbing, the photoalignment method has been widely studied. [0007] The photo-alignment method has various methods, generally using linearly polarized or collimated light to form an anisotropy in an organic film constituting a liquid crystal alignment film, and liquid crystal is formed according to the anisotropy. Produce alignment. The main photoalignment method is, for example, a photo-alignment method known as a decomposition type. For example, the polarized ultraviolet light is irradiated onto the polyimide film, and the dependence of the polarization direction of the ultraviolet absorption of the molecular structure is utilized to cause anisotropic decomposition. Subsequently, the liquid crystal is aligned by the polyimine remaining without being decomposed (Patent Document 1). Further, a photocrosslinking type photoalignment method is known. For example, polyethylene cinnamate is used, and a polarized ultraviolet ray is irradiated to cause a dimerization reaction (crosslinking reaction) between the polarized light and the double bond portions of the two side chains in parallel. Moreover, the pretilt angle is generated by irradiating the oblique direction with the polarized ultraviolet rays (Non-Patent Document 1). Further, in the case where a side chain type polymer having a coumarin having a side chain is used, a polarized ultraviolet ray is irradiated to cause a photocrosslinking reaction of a coumarin portion of a side chain parallel to the polarized light, and is parallel to a direction of polarization. The liquid crystal is aligned to form (Non-Patent Document 2). [0010] As described above, the alignment treatment method of the liquid crystal alignment film using the photo-alignment method does not require friction, so there is no fear of generating dust or static electricity. Therefore, the substrate of the liquid crystal display element having the unevenness on the surface can be subjected to the alignment treatment, and is a method of alignment treatment of the liquid crystal alignment film suitable for the industrial production process. In addition, since the optical alignment method can control the alignment direction via ultraviolet rays, a plurality of regions (alignment division) in which the alignment directions are different can be formed in the pixels, and the dependence of the viewing angle can be compensated. On the other hand, the liquid crystal alignment film has a function of imparting a certain tilt angle (pretilt angle) to the liquid crystal, and the application of the pretilt angle is an important issue in the development of the liquid crystal alignment film (Patent Document 1 to 4). Further, it is known that a copolymer having a cinnamic acid ester structure in a side chain and a monomer having two other benzene rings has photo-alignment properties (Patent Document 5). However, since this copolymer has a low solubility, it is necessary to use a solvent such as chloroform which is not industrially usable as a coating material, and it is extremely difficult to use it as a liquid crystal alignment agent. [PRIOR ART DOCUMENT] [Patent Document 1] [Patent Document 1] Japanese Patent Laid-Open Publication No. Hei 02-223916 (Patent Document 2) Japanese Patent Laid-Open Publication No. Hei 04-281427 Japanese Patent Laid-Open Publication No. Hei. No. Hei. No. Hei. No. Hei. No. Hei. [Non-Patent Document 1] [Non-Patent Document 1] S. Kobayashi et al., Journal of Photopolymer Science and Technology, Vol. 8, No. 2, pp 25-262 (1995). [Non-Patent Document 2] M. Shadtetal., Nature. Vol 381, 212 (1996).

[Problems to be Solved by the Invention] As described above, the optical alignment method is superior to the conventional friction method using the alignment treatment method as a liquid crystal display element, and does not require a rubbing step, so that it is extremely advantageous. . Further, when compared with the rubbing method in which the alignment control ability via friction is almost constant, the photo-alignment method can change the irradiation amount of the polarized light to control the alignment control ability. However, in the photo-alignment method, when it is desired to achieve the same alignment control ability as in the case of the rubbing method, it is necessary to use a large amount of polarized light irradiation amount, so that there is still a case where the liquid crystal alignment cannot be stabilized. [0015] For example, in the decomposition type photo-alignment method described in Patent Document 1, it is necessary to use a high-pressure mercury lamp outputting 500 W to irradiate the polyimide film with ultraviolet light for 60 minutes, etc., so that it is necessary to pass a long time and a large amount of The method of ultraviolet irradiation. Further, in the case of the dimerization type or the photoisomerization type photo-alignment method, it is necessary to irradiate a large amount of ultraviolet rays of several J (Joules) to several tens of J. Further, in the photo-crosslinking type or the photo-isomerization type photo-alignment method, since the thermal stability or the light stability of the liquid crystal alignment is inferior, when it is used as a liquid crystal display element, there is a problem that alignment failure or image sticking occurs. [0016] Therefore, in the photo-alignment method, a method for achieving high-efficiency alignment treatment or stable liquid crystal alignment is sought, and a liquid crystal alignment film capable of imparting high alignment control ability to a liquid crystal alignment film or high efficiency is sought. Liquid crystal alignment agent. [0017] The present invention provides a substrate having a liquid crystal alignment film for a liquid crystal display element which can provide an alignment control ability and an excellent tilt angle characteristic, and a twisted nematic liquid crystal display element and an OCB type liquid crystal display element having the substrate for purpose. Further, in addition to the above objects, an object of the present invention is to provide a twisted nematic liquid crystal display element having an improved tilt angle characteristic, an OCB type liquid crystal display element, and a liquid crystal alignment film used for the element. [Means for Solving the Problems] The inventors of the present invention have conducted intensive studies to achieve the above object, and have studied the following inventions. <1> A polymer composition comprising a copolymer obtained from a monomer mixture containing (A) the following monomer (A-1) and monomer (A-2); (A-1): a monomer having one cinnabar base group and two to four benzene rings which do not constitute a cinnabar base group, and a polymerizable group. Monomer (A-2): a monomer having one cassia sulfhydryl moiety and one benzene ring which does not constitute a cinnabar thiol moiety, and a polymerizable group. (The above-mentioned cinnamoyl moiety and the benzene ring may have a substituent). [2] The polymer composition according to claim 1, wherein the polymerizable group of the monomer (A-1) and the monomer (A-2) is an acrylic group or a methacryl group. <3> In the above <1>, the component (A) is a group selected from the group represented by the following formula (1) and the group represented by the following formula (2). A monomer which is bonded to a polymerizable group is preferred. [0022] [0023] wherein A, B, and D each independently represent a single bond, -O-, -CH ₂ -, -COO-, -OCO-, -CONH- or -NH-CO-; S is a C1-C12 alkyl group in which the bonded hydrogen atoms are each independently and may be substituted by a halogen group; a single bond or a C1-C12 alkyl group, the bonded hydrogen atom may be substituted by a halogen group; when T represents a single bond, B also represents a single bond; ₁ a divalent benzene ring; P ₁ , Q ₁ And Q ₂ Each independently is a group selected from the group consisting of a benzene ring and an alicyclic hydrocarbon ring having 5 to 8 carbon atoms; ₁ Is a hydrogen atom, -CN, a halogen group, an alkyl group having 1 to 5 carbon atoms, a (carbonyl group having 1 to 5 carbon atoms) carbonyl group, a cycloalkyl group having 3 to 7 carbon atoms or an alkoxy group having 1 to 5 carbon atoms. . Y ₁ , P ₁ , Q ₁ And Q ₂ In the above, the hydrogen atom bonded to the benzene ring is independently and may be -CN, a halogen group, an alkyl group having 1 to 5 carbon atoms, a (carbonyl group having 1 to 5 carbon atoms) carbonyl group, or an alkoxy group having 1 to 5 carbon atoms. Substituted by base; X ₁ And X ₂ , each independently represents a single bond, -O-, -COO- or -OCO-; n1 and n2 are each independently 0, 1 or 2, X ₁ When the number is 2, X ₁ Can be the same or different from each other, X ₂ When the number is 2, X ₂ Can be the same or different from each other; Q ₁ When the number is 2, Q ₁ Can be the same or different from each other, Q ₂ When the number is 2, Q ₂ May be the same or different from each other; monomer (A-1), Y ₁ The total number of benzene rings other than the number of benzene rings is 2 to 4; in the monomer (A-2), Y ₁ The total number of benzene rings other than the one is 1; the broken line indicates the bonding bond with the polymerizable group. [4] A method for producing a substrate having the liquid crystal alignment film, comprising: [I] the polymer composition according to any one of the above <1> to <3>, which is applied to a step of forming a coating film on a substrate having an electrode for driving a liquid crystal; [II] a step of irradiating the polarized ultraviolet light with a coating film obtained by [I] from a slope direction; and [III] a coating film obtained by [II] The step of heating is performed; and a twisted nematic liquid crystal display element and an OCB liquid crystal display element liquid crystal alignment film which impart alignment control ability are obtained. [5] A substrate comprising the twisted nematic liquid crystal display device and/or the liquid crystal alignment film for an OCB liquid crystal display device produced by the production method according to the above <4>. <6> A twisted nematic liquid crystal display device and an OCB liquid crystal display device, comprising the substrate of the above <5>. [7] A method of manufacturing a liquid crystal display device, comprising: a step of preparing the substrate (first substrate) of the above <5>;[I'] using any of the above <1> to <4> a step of applying a polymer composition described on a second substrate to form a coating film; [II'] a step of irradiating the coating film obtained by [I'] with polarized ultraviolet rays; and [III'] a step of heating the obtained coating film; a step of obtaining a second substrate having a liquid crystal alignment film imparting alignment control capability; and [IV] making the liquid crystal alignment films of the first and second substrates relatively opposed by liquid crystal In the state, the first and second substrates are arranged to face each other so that the exposure directions are perpendicular to each other, and the liquid crystal display element is produced. The twisted nematic liquid crystal display element and the OCB type liquid crystal display element are obtained. <8> A twisted nematic liquid crystal display device and an OCB liquid crystal display device, which are produced by the above <7>. [Effects of the Invention] The present invention can provide a liquid crystal alignment film substrate having an excellent alignment angle control capability and excellent tilt angle characteristics, and a twisted nematic liquid crystal display element and an OCB type liquid crystal display element having the substrate. . Since the twisted nematic liquid crystal display element and the OCB type liquid crystal display element obtained by the method of the present invention can impart high-efficiency alignment control ability, the display characteristics are not degraded even if driven continuously for a long period of time. [Form of the invention] The liquid crystal alignment agent used in the production method of the present invention has a photosensitive side chain type polymer (hereinafter, simply referred to as a side chain type polymer) capable of generating liquid crystallinity. Therefore, the coating film obtained by using the liquid crystal alignment agent is a photosensitive side chain type polymer film which can produce liquid crystallinity. The coating film does not need to be subjected to rubbing treatment, and the alignment treatment can be performed by polarized light irradiation. Therefore, after the polarized light irradiation, a coating film having an alignment control ability (hereinafter also referred to as a liquid crystal alignment film) can be formed by the step of heating the side chain type polymer film. At this time, a slight anisotropy generated by the polarized light irradiation forms a driving force, and the liquid crystalline side chain type polymer itself is realigned efficiently by self-organization. As a result, an efficient alignment treatment of the liquid crystal alignment film can be realized, and a liquid crystal alignment film imparting high alignment control ability can be obtained. [0029] Hereinafter, embodiments of the present invention will be described in detail. <Method for Producing Substrate Having Liquid Crystal Alignment Film> and <Method for Producing Liquid Crystal Display Element><<(A) Side Chain Type Polymer>> (A) The composition is composed of the following monomer (A- 1) A copolymer obtained by a monomer mixture of the monomer (A-2) (hereinafter also referred to as a side chain type polymer). Monomer (A-1): a monomer having one cinnabar base group and two to four benzene rings which do not constitute a cinnabar base group, and a polymerizable group. Monomer (A-2): a monomer having one cassia sulfhydryl moiety and one benzene ring which does not constitute a cinnabar thiol moiety, and a polymerizable group. (The above-mentioned cinnamoyl moiety and the benzene ring may have a substituent). Further, the substituent referred to herein is, for example, a methyl group, a methoxy group, a t-butyl group, an ethyl fluorenyl group, a fluoro group, a cyano group or the like. (A) The side chain type polymer has a photosensitive side chain due to a main chain bond, and thus can induce a crosslinking reaction and an isomerization reaction. The structure of the photosensitive side chain is not particularly limited, and it is preferably a structure which can induce a crosslinking reaction by light. In this case, even when exposed to an external pressure such as heat, the achieved alignment control ability can be stabilized for a long period of time. More specific examples of the structure of the side chain type polymer of the component (A), for example, having a hydrocarbon, a (meth) acrylate, an isoconate, a fumarate, a maleate, At least one selected from the group consisting of radically polymerizable groups such as α-methyl-γ-butyrolactone, styrene, vinyl, maleimide, and norbornene The main chain is preferably a structure of a side chain formed by at least one of the following formulas (1) and (2). [0034] Wherein A, B, and D each independently represent a single bond, -O-, -CH ₂ -, -COO-, -OCO-, -CONH- or -NH-CO-; S is a C1-C12 alkyl group in which the bonded hydrogen atoms are each independently and may be substituted by a halogen group; a single bond or a C1-C12 alkyl group, the bonded hydrogen atom may be substituted by a halogen group; when T represents a single bond, B also represents a single bond; ₁ a divalent benzene ring; P ₁ , Q ₁ And Q ₂ Each independently is a group selected from the group consisting of a benzene ring and an alicyclic hydrocarbon ring having 5 to 8 carbon atoms; ₁ Is a hydrogen atom, -CN, a halogen group, an alkyl group having 1 to 5 carbon atoms, a (carbonyl group having 1 to 5 carbon atoms) carbonyl group, a cycloalkyl group having 3 to 7 carbon atoms or an alkoxy group having 1 to 5 carbon atoms. . Y ₁ , P ₁ , Q ₁ And Q ₂ In the above, the hydrogen atom bonded to the benzene ring is independently and may be -CN, a halogen group, an alkyl group having 1 to 5 carbon atoms, a (carbonyl group having 1 to 5 carbon atoms) carbonyl group, or an alkoxy group having 1 to 5 carbon atoms. Substituted by base; X ₁ And X ₂ , each independently represents a single bond, -O-, -COO- or -OCO-; n1 and n2 are each independently 0, 1 or 2, X ₁ When the number is 2, X ₁ Can be the same or different from each other, X ₂ When the number is 2, X ₂ Can be the same or different from each other; Q ₁ When the number is 2, Q ₁ Can be the same or different from each other, Q ₂ When the number is 2, Q ₂ May be the same or different from each other; monomer (A-1), Y ₁ The total number of benzene rings other than the number of benzene rings is 2 to 4; in the monomer (A-2), Y ₁ The total number of benzene rings other than the one is 1; the broken line indicates the bonding bond with the polymerizable group. (A-1) In the total of the content of the side chain generated by (A-1) and the content of the side chain produced by (A-2) in the side chain type polymer of the present invention The content of the side chain to be produced is preferably from 10 mol% to 90 mol%, and from 20 mol% to 80 mol%, from the viewpoints of liquid crystal alignment and solubility of the side chain type polymer. Preferably, 30% to 70% by mole is more preferred. The side chain type polymer of the present invention may contain the side chain generated by the above (A-1) and the side chain other than the side chain generated by (A-2), insofar as the effect of the present invention is not impaired. The content is the remainder of the case where the total content of the photoreactive side chain and the liquid crystal side chain is less than 100%. <<Method for Producing Photosensitive Side Chain Type Polymer>> A photosensitive side chain type polymer having the above liquid crystallinity can be produced, and at least the above monomer (A-1) and monomer (A-2) can be contained. The monomer mixture is prepared by polymerization. [Monomer (A-1) and Monomer (A-2)] The photoreactive side chain monomer may have a photosensitive side chain at the side of forming a polymer in the case of forming a polymer. Monomer of polymer. The photoreactive group having a side chain is preferably the following structure and derivatives thereof. More specific examples of the monomer (A-1) and the monomer (A-2), for example, have a hydrocarbon, (meth) acrylate, isoconate, fumarate, Malay Selected from the group consisting of a radical polymerizable group such as an acid ester, α-methyl-γ-butyrolactone, styrene, vinyl, maleimide, norbornene, and a trialkoxyalkyl group It is preferable that the polymerizable group composed of at least one kind of the photosensitive side chain selected from the structures represented by the above formulas (1) and (2) is preferable. The polymerizable group is preferably selected, for example, by a group represented by the following formulas PG1 to PG8. Among them, from the viewpoint of easily controlling the viewpoint of the polymerization reaction and the stability of the polymer, an acrylic group or a methacryl group represented by PG1 is preferred. Further, in the formula, the broken line indicates the bonding bond of the photosensitive side chain represented by the above formula (1) or (2). [0042] (In the formula PG1, M1 is a hydrogen atom or a methyl group). The monomer (A-1), for example, a monomer selected from the following formulas A1-1 to A1-7. [0045] [0046] (In the formulae A1-1 to A1-7, PG represents a polymerizable group selected from the groups represented by the above formulas PG1 to PG8, and s1 and s2 each independently represent the number of methyl groups, and is 2 to 9 Natural number). The monomer (A-2), for example, a monomer selected from the following formulas A2-1 to A2-14, and the like. [0049] [0050] [0051] (In the formulae A2-1 to A2-14, PG represents a polymerizable group selected from the groups represented by the above formulas PG1 to PG8, and s1 and s2 each independently represent the number of methyl groups, and are 2 to 9 Natural number). [0053] A part of the above-mentioned monomer (A-1) and monomer (A-2) is a commercially available article, and a part thereof is, for example, a method described in International Patent Application Publication No. WO2014/074785. be made of. (A) A side chain type polymer can be obtained by a copolymerization reaction of the above monomer (A-1) and monomer (A-2). Further, it is also possible to copolymerize with other monomers as long as the range of liquid crystal generating ability is not impaired. [0055] In the case where the polymerizable group of the monomers (A-1) and (A-2) is a radical polymerizable group, other monomers, for example, monomers which are easily obtained in the industry and which are capable of undergoing radical polymerization reaction Wait. Specific examples of the other monomer include, for example, an unsaturated carboxylic acid, an acrylate compound, a methyl acrylate compound, a maleimide compound, acrylonitrile, maleic anhydride, a styrene compound, and a vinyl compound. Specific examples of the unsaturated carboxylic acid include, for example, acrylic acid, methacrylic acid, isaconic acid, maleic acid, fumaric acid, and the like. Acrylate compound, for example, methyl acrylate, ethyl acrylate, isopropyl acrylate, benzyl acrylate, naphthyl acrylate, decyl acrylate, decyl methacrylate, phenyl acrylate, 2, 2, 2- Ethyl trifluoroacrylate, tert-butyl acrylate, lauryl acrylate, palmitic acrylate, cyclohexyl acrylate, isodecyl acrylate, ethyl 2-methoxyacrylate, triethylene glycol methoxyacrylate, Ethyl 2-ethoxyacrylate, tetrahydrofurfuryl acrylate, 3-methoxybutyl acrylate, 2-methyl-2-adamantyl acrylate, 2-propyl-2-adamantyl acrylate , 8-methyl-8-tricyclodecyl acrylate, and 8-ethyl-8-tricyclodecyl acrylate. a methyl acrylate compound, for example, methyl methacrylate, methyl ethacrylate, methyl isopropyl acrylate, methyl benzyl acrylate, methyl naphthyl methacrylate, methyl methacrylate, fluorenyl amide Methyl methacrylate, methyl phenyl acrylate, methyl 2,2,2-trifluoroethyl acrylate, tert-butyl methacrylate, methyl lauryl methacrylate, methyl palm acrylate, methyl cyclohexyl acrylate , isomethyl methacrylate, methyl 2-methoxyethyl acrylate, methyl methoxytriethylene glycol acrylate, methyl 2-ethoxyethyl acrylate, tetrahydrofurfuryl methacrylate, 3- Methyl methoxybutyl methacrylate, methyl 2-methyl-2-adamantyl acrylate, methyl 2-propyl-2-adamantyl acrylate, 8-methyl-8-tricyclodecyl acrylate Ester, and methyl 8-ethyl-8-tricyclodecyl acrylate. a vinyl compound, for example, vinyl ether, methyl vinyl ether, benzyl vinyl ether, 2-hydroxyethyl vinyl ether, phenyl vinyl ether, and propyl vinyl ether, and the like. a styrene compound, for example, styrene, methyl styrene, chlorostyrene, bromostyrene, and the like. A maleimine compound, for example, maleimide, N-methylmaleimide, N-phenylmaleimide, and N-cyclohexylmaleimide. The content of the photoreactive side chain represented by (A-1) and (A-2) in the side chain type polymer of the present invention is from 10 mol% to 100 mol from the viewpoint of liquid crystal alignment. The ear% is preferably from 20 mol% to 100 mol%, more preferably from 30 mol% to 100 mol%. The method for producing the side chain type polymer of the present embodiment is not particularly limited, and a method widely used in general industrial processing can be used. Specifically, a vinyl group of the monomer (A-1) or (A-2) can be produced by cationic polymerization, radical polymerization or anionic polymerization. Among these, the viewpoint of reaction control is easy, and radical polymerization is particularly preferable. The conditions of the radical polymerization polymerization initiator, the reaction temperature, the solvent, and the like, and the known conditions described in International Patent Publication No. WO2014/074785, etc., can be used. [Method for Producing Polyoxane] The polymer of the component (A) used in the present invention is a polyoxyalkylene. The method for producing the polyoxyalkylene is not particularly limited. In the present invention, a mixture of the above monomer (A-1) and monomer (A-2) and a monomer having a polymerizable group of a trialkoxyalkyl group as an essential component may be used as an organic solvent. It can be obtained by condensation. Usually, a polyoxyalkylene is obtained by polycondensing the alkoxydecane and uniformly dissolving it in an organic solvent. In the present invention, in addition to the above monomer (A-1) and monomer (A-2), an alkoxydecane represented by the following formula (3) may be used. Since the alkoxydecane represented by the formula (3) imparts various properties to the polyoxyalkylene, one or a plurality of types can be selected in accordance with the necessary characteristics. [0067] (R) ⁵ a hydrogen atom, or a hydrocarbon group having 1 to 6 carbon atoms which may be substituted by a hetero atom, a halogen atom, an amine group, a glycidoxy group, a thiol group, an isocyanate group or a urea group, R ⁶ It is an alkyl group having 1 to 5 carbon atoms, preferably 1 to 3, and n is 0 to 3, preferably an integer of 0 to 2. R of the alkoxydecane represented by the formula (3) ⁵ It is a hydrogen atom or an organic group having 1 to 6 carbon atoms (hereinafter, also referred to as a third organic group). Examples of the third organic group include, for example, an aliphatic hydrocarbon; a ring structure of an aliphatic ring, an aromatic ring, and a hetero ring; an unsaturated bond; and a hetero atom which may contain an oxygen atom, a nitrogen atom, a sulfur atom, or the like. An organic group having a branched structure and having 1 to 6 carbon atoms. Further, the organic group may be substituted by a halogen atom, an amine group, a glycidoxy group, a thiol group, an isocyanate group, a urea group or the like. Specific examples of the alkoxydecane represented by the above formula (3) are not limited to the above. In the alkoxy decane of formula (3), R ⁵ Specific examples of the alkoxydecane which is a hydrogen atom are, for example, trimethoxydecane, triethoxysilane, tripropoxydecane, tributoxydecane, and the like. Further, in the alkoxydecane of the formula (3), R ⁵ Specific examples of the alkoxydecane in the case of the third organic group include, for example, methyltrimethoxydecane, methyltriethoxydecane, ethyltrimethoxydecane, ethyltriethoxydecane, and propyltrimethyl. Oxydecane, propyltriethoxydecane, methyltripropoxydecane, 3-aminopropyltrimethoxydecane, 3-aminopropyltriethoxydecane, N-2 (amino B 3-aminopropyltriethoxydecane, N-2 (aminoethyl) 3-aminopropyltrimethoxydecane, 3-(2-aminoethylaminopropyl)trimethoxy Decane, 3-(2-aminoethylaminopropyl)triethoxydecane, 2-aminoethylaminomethyltrimethoxydecane, 2-(2-aminoethylthioethyl)triethyl Oxydecane, 3-hydrothiopropyltriethoxydecane, thiomethylmethyltrimethoxydecane, vinyltriethoxydecane, 3-isocyanatepropyltriethoxydecane,trifluoropropyl Trimethoxydecane, chloropropyltriethoxydecane, bromopropyltriethoxydecane, 3-hydrothiopropyltrimethoxydecane, dimethyldiethoxydecane, dimethyldimethoxy Base decane, diethyldiethoxy decane, diethyldimethoxy Decane, diphenyldimethoxydecane, diphenyldiethoxydecane, 3-aminopropylmethyldiethoxydecane, 3-aminopropyldimethylethoxydecane, trimethyl Ethoxy decane, trimethyl methoxy decane, γ-urelide propyl triethoxy decane, γ-urelide propyl trimethoxy decane and γ- guanidinopropyl propyl Propoxydecane, etc. When the polysiloxane of the present invention is used for the purpose of improving adhesion to a substrate and affinity with liquid crystal molecules, one or more of the above formulas (3) may be used without departing from the effects of the present invention. ) alkoxydecane represented by . Among the alkoxydecanes represented by the formula (3), the alkoxydecane in which n is 0 is a tetraalkoxydecane. The tetraalkoxydecane is preferred because it is easily subjected to a condensation reaction with the alkoxydecane represented by the formula (1) and the formula (2) to obtain the polyoxyalkylene of the present invention. In the formula (3), the alkoxy decane wherein n is 0, for example, tetramethoxy decane, tetraethoxy decane, tetrapropoxy decane or tetrabutoxy decane is preferred, especially Tetramethoxydecane or tetraethoxydecane is preferred. The method described in the International Patent Publication No. WO2010/126108 or the like can be used as a method of polycondensing a polydecane. [Recovery of Polymer] In the case where the produced polymer is recovered from the reaction solution of the photosensitive side chain type polymer which can produce liquid crystal obtained by the above reaction, the reaction solution can be introduced into a poor solvent. These polymers can be precipitated. a poor solvent used for precipitation, for example, methanol, acetone, hexane, heptane, butyl cellosolve, heptane, methyl ethyl ketone, methyl isobutyl ketone, ethanol, toluene, benzene, diethyl ether, methyl ether, Water, etc. The polymer which has been precipitated by the lean solvent is recovered by filtration, and then dried at normal temperature or under reduced pressure under normal pressure or reduced pressure. Further, when the polymer recovered by precipitation is repeatedly used twice or more times in the operation of dissolving in an organic solvent and reprecipitating and recovering, impurities in the polymer can be lowered. In the case of the poor solvent at this time, for example, an alcohol, a ketone, a hydrocarbon or the like can be used, and when three or more kinds of poor solvents selected from the above are used, it is more preferable to further improve the efficiency of purification. The molecular weight of the (A) side chain type polymer of the present invention is determined by a GPC (Gel Permeation Chromatography) method in consideration of the strength of the obtained coating film, the workability at the time of formation of a coating film, and the uniformity of the coating film. The weight average molecular weight is preferably from 2,000 to 1,000,000, more preferably from 5,000 to 100,000. <Organic Solvent> The organic solvent used in the polymer composition used in the present invention is not particularly limited as long as it can dissolve the organic solvent of the resin component. Specific examples thereof are as follows. N,N-dimethylformamide, N,N-dimethylacetamide, N-methyl-2-pyrrolidone, N-methylcaprolactam, 2-pyrrolidone, N- Ethyl pyrrolidone, N-vinylpyrrolidone, dimethyl hydrazine, tetramethyl urea, pyridine, dimethyl hydrazine, hexamethylarylene, γ-butyrolactone, 3-methoxy- N,N-dimethylpropane decylamine, 3-ethoxy-N,N-dimethylpropane decylamine, 3-butoxy-N,N-dimethylpropane decylamine, 1,3-two Methyl-imidazolidinone, ethyl pentanone, methyl fluorenone, methyl ethyl ketone, methyl isoamyl ketone, methyl isopropanone, cyclohexanone, ethylene carbonate, propylene carbonate, diethylene glycol Glyme, 4-hydroxy-4-methyl-2-pentanone, propylene glycol monoacetate, propylene glycol monomethyl ether, propylene glycol-tert-butyl ether, dipropylene glycol monomethyl ether, diethylene glycol, diethyl Glycol monoacetate, diethylene glycol dimethyl ether, dipropylene glycol monoacetate monomethyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, dipropylene glycol monoacetate monoethyl ether, dipropylene glycol monopropyl ether , dipropylene glycol monoacetate monopropyl ether, 3-methyl-3-methoxybutyl acetate, tripropylene glycol methyl ether, and the like. These may be used singly or in combination. <Liquid Crystal Aligning Agent> The liquid crystal alignment agent is applied to the above substrate to form a side surface of the electrode. The liquid crystal alignment agent of the present invention is a polymer composition containing the polymer obtained from the monomer mixture containing the above (A) monomer (A-1) and monomer (A-2). . [Production of Liquid Crystal Aligning Agent] The liquid crystal alignment agent used in the present invention is preferably formed by blending a liquid crystal alignment film to form a coating liquid. In other words, the liquid crystal alignment agent used in the present invention is preferably a solution obtained by dissolving a resin component capable of forming a resin film in an organic solvent. Here, the resin component is a resin component of the side chain type polymer containing the component (A) described above. In this case, the content of the resin component is preferably from 1% by mass to 20% by mass, more preferably from 3% by mass to 15% by mass, even more preferably from 3% by mass to 10% by mass. In the liquid crystal alignment agent of the present invention, the resin component may be a side chain type polymer of the component (A). However, when the range of the liquid crystal alignment ability is not impaired, the polymerization other than the above may be further mixed. Things. In this case, the content of the other polymer in the resin component is from 0.5% by mass to 80% by mass, preferably from 1% by mass to 50% by mass. These other polymers are, for example, polymers other than the side chain type polymer of the component (A) formed of poly(meth)acrylate, polylysine or polyimine. The polymer composition used in the present invention may contain a side chain type polymer of the above component (A) and a component other than the organic solvent. For example, when a liquid crystal alignment agent is applied, a solvent or a compound which can improve film thickness uniformity or surface smoothness, a compound which improves the adhesion between the liquid crystal alignment film and the substrate, and the like are not limited thereto. Some content. Specific examples of the solvent (lean solvent) which improves the film thickness uniformity or the surface smoothness are, for example, the contents listed below. For example, isopropanol, methoxymethylpentanol, cellosolve, ethyl cellosolve, butyl cellosolve, methyl cellosolve acetate, ethyl cellosolve acetate , butyl carbitol, ethyl carbitol, ethyl carbitol acetate, ethylene glycol, ethylene glycol monoacetate, ethylene glycol monoisopropyl ether, ethylene glycol monobutyl ether, propylene glycol , propylene glycol monoacetate, propylene glycol monomethyl ether, propylene glycol-tert-butyl ether, dipropylene glycol monomethyl ether, diethylene glycol, diethylene glycol monoacetate, diethylene glycol dimethyl ether, dipropylene glycol single Acetate monomethyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, dipropylene glycol monoacetate monoethyl ether, dipropylene glycol monopropyl ether, dipropylene glycol monoacetate monopropyl ether, 3-methyl-3- Methoxybutyl acetate, tripropylene glycol methyl ether, 3-methyl-3-methoxybutanol, diisopropyl ether, ethyl isobutyl ether, diisobutyl ester, pentyl acetate, butyl Butyrate, dibutyl ether, diisobutyl ketone, methyl cyclohexene, propyl ether, dihexyl ether, 1-hexanol, n-hexane, n-pentane, n-octane, diethyl ether, lactic acid Methyl ester, ethyl lactate, methyl acetate, B Ethyl ester, n-butyl acetate, propylene glycol monoethyl ether, methyl pyruvate, ethyl pyruvate, methyl 3-methoxypropionate, methyl ethyl 3-ethoxypropionate, 3-methoxy Ethyl propyl propionate, 3-ethoxypropionic acid, 3-methoxypropionic acid, propyl 3-methoxypropionate, butyl 3-methoxypropionate, 1-methoxy-2- Propanol, 1-ethoxy-2-propanol, 1-butoxy-2-propanol, 1-phenoxy-2-propanol, propylene glycol monoacetate, propylene glycol diacetate, propylene glycol- 1-monomethyl ether-2-acetate, propylene glycol-1-monoethyl ether-2-acetate, dipropylene glycol, 2-(2-ethoxypropoxy)propanol, methyl lactate, ethyl lactate A solvent having a low surface tension such as n-propyl lactate, n-butyl lactate or isoamyl lactate. [0082] These poor solvents may be used alone or in combination of a plurality of types. When the solvent is used, the solubility of the entire solvent contained in the polymer composition is not significantly lowered, and it is preferably from 5% by mass to 80% by mass based on the total amount of the solvent, more preferably from 20% by mass to 60% by mass. A compound capable of improving film thickness uniformity or surface smoothness, for example, a fluorine-based surfactant, a polyoxon-based surfactant, a nonionic surfactant, or the like. More specifically, for example, F-TOP (registered trademark) 301, EF303, EF352 (manufactured by Dow Chemical Co., Ltd.), Megève (registered trademark) F171, F173, R-30 (manufactured by DIC Corporation), Fluorad FC430, FC431 (manufactured by Sumitomo 3M Co., Ltd.), AsahiGuard (registered trademark) AG710 (manufactured by Asahi Glass Co., Ltd.), Safreon (registered trademark) S-382, SC101, SC102, SC103, SC104, SC105, SC106 (manufactured by AGC Precision Chemical Co., Ltd.). The use ratio of the surfactant is preferably 0.01 parts by mass to 2 parts by mass, more preferably 0.01 parts by mass to 1 part by mass, per 100 parts by mass of the resin component contained in the polymer composition. Specific examples of the compound which can improve the adhesion between the liquid crystal alignment film and the substrate, for example, a compound containing a functional decane shown below. For example, 3-aminopropyltrimethoxydecane, 3-aminopropyltriethoxydecane, 2-aminopropyltrimethoxydecane, 2-aminopropyltriethoxydecane, N- (2-Aminoethyl)-3-aminopropyltrimethoxydecane, N-(2-aminoethyl)-3-aminopropylmethyldimethoxydecane, 3-carbazide ( Ureide) propyltrimethoxydecane, 3-guanidinopropyltriethoxydecane, N-ethoxycarbonyl-3-aminopropyltrimethoxydecane, N-ethoxycarbonyl-3-amine Propyltriethoxydecane, N-triethoxydecylpropyltrivinyltriamine, N-trimethoxydecylpropyltrivinyltriamine, 10-trimethoxydecyl-1,4,7- Triazanonane, 10-triethoxydecyl-1,4,7-triazadecane, 9-trimethoxydecylalkyl-3,6-diazadecyl acetate, 9-triethyl Oxidylalkyl-3,6-diazaindolyl acetate, N-benzyl-3-aminopropyltrimethoxydecane, N-benzyl-3-aminopropyltriethoxydecane, N-phenyl-3-aminopropyltrimethoxydecane, N-phenyl-3-aminopropyltriethoxydecane, N-bis(oxyvinyl)-3-aminopropyltrimethoxy Baseline, N-bis(oxyvinyl)-3-aminopropyl Silane triethoxysilane and the like. Further, in addition to the adhesion between the lift substrate and the liquid crystal alignment film, it is possible to prevent the electrical characteristics of the backlight from being lowered when the liquid crystal display element is formed, and the like, and the following phenolic plastic can be contained in the liquid crystal alignment agent ( Phenoplast) is an additive to an epoxy-containing compound. Specifically, the phenoplast-based additive is, for example, the following, but is not limited to this structure. [0086] Specific epoxy group-containing compounds, for example, ethylene glycol diglycidyl ether, polyethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, tripropylene glycol diglycidyl ether, polypropylene glycol diglycidyl ether , neopentyl glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, glycerol diglycidyl ether, 2,2-dibromoneopentyl glycol diglycidyl ether, 1, 3,5,6-tetraglycidyl-2,4-hexanediol, N,N,N',N'-tetraglycidyl-m-xylylenediamine, 1,3-bis(N,N- Diglycidylaminomethyl)cyclohexane, N,N,N',N'-tetraglycidyl-4, 4'-diaminodiphenylmethane, and the like are exemplified. When the compound having the adhesion to the substrate is used, the amount thereof is preferably 0.1 parts by mass to 30 parts by mass, more preferably 1 part by mass, per 100 parts by mass of the resin component contained in the liquid crystal alignment agent. ~ 20 parts by mass. When the amount used is less than 0.1 part by mass, the effect of improving the adhesion cannot be expected, and when it is more than 30 parts by mass, the alignment of the liquid crystal may be deteriorated. [0089] As the additive, a photosensitizer can be used. Further, a colorless sensitizer and a triple sensitizer are preferred. Photo sensitizer, for example, aromatic nitro compound, coumarin (7-diethylamino-4-methylcoumarin, 7-hydroxy 4-methylcoumarin), ketocoumarin, carbonyl Dicoumarin, aromatic 2-hydroxyketone, and aromatic 2-hydroxyketone substituted by amine group (2-hydroxybenzophenone, mono- or di-p-(dimethylamino)-2-hydroxyl Benzophenone), acetophenone, hydrazine, Ketone, 9-oxosulfur , benzoxanthone, thiazolines (2-benzylidene-methyl-3-methyl-β-naphthylthiazoline, 2-(β-naphthylmethyl)methyl-3-benzoate Thiazolines, 2-(α-naphthylmethyl)-3-methylbenzothiazoline, 2-(4-biphenololmethyl)-3-methylbenzothiazoline (thiazolines) , 2-(β-naphthoquinonemethyl)-3-methyl-β-naphthylthiazoline, 2-(4-biphenolylmethyl)-3-methyl-β-naphthylthiazoline, 2-( p-Fluorobenzoyl hydrazide methyl)-3-methyl-β-naphthyl thiazoline), oxazoline (2-benzylidenemethyl-3-methyl-β-naphthyloxaline, 2- (β-naphthyl fluorenylmethyl)-3-methylbenzoxazoline, 2-(α-naphthylmethylidenemethyl)-3-methylbenzoxazoline, 2-(4-biphenolyl) Methyl)-3-methylbenzoxazoline, 2-(β-naphthylmethylidenemethyl)-3-methyl-β-naphthyloxaline, 2-(4-biphenolylmethyl)- 3-methyl-β-naphthyloxazoline, 2-(p-fluorobenzhydrylmethyl)-3-methyl-β-naphthyloxazoline, benzothiazole, nitroaniline (m- or P-nitroaniline, 2,4,6-trinitroaniline) or nitronaphthene (5-nitroanthracene (acenaphthene), (2-[(m-hydroxy-p-methoxy) Styryl]benzothiophene , benzoxane ether, N-alkylated fluorenone, acetophenone ketal (2,2-dimethoxyphenyl ethyl ketone), naphthalene, anthracene (2-naphthyl methanol, 2-naphthyl carboxylic acid, 9 - 蒽methanol, and 9-fluorene carboxylic acid), benzopyran, azo (indolizine), coumarin (mero-coumarin), etc. Preferred are aromatic 2-hydroxyketone (benzophenone), coumarin, ketocoumarin, carbonyl dicoumarin, acetophenone, anthracene, Ketone, 9-oxosulfur And acetophenone ketal. [0090] A method for producing a substrate having a liquid crystal alignment film of the present invention comprises: [I] applying a liquid crystal alignment agent containing (A) a side chain type polymer and an organic solvent to a substrate having a transparent electrode And a step of forming a coating film; [II] a step of irradiating the coating film obtained by [I] with polarized ultraviolet rays; and [III] a step of heating the coating film obtained in [II]. Through the above steps, a liquid crystal alignment film for a liquid crystal display element which imparts an alignment control ability can be obtained, and a substrate having the liquid crystal alignment film can be obtained. Further, in addition to the substrate (first substrate) obtained above, a liquid crystal display element can be obtained by preparing a second substrate. In the second substrate, the second substrate having the liquid crystal alignment film imparting the alignment control ability can be obtained by using the above steps [I] to [III] on the second substrate having the transparent electrode. [0092] The method for producing a twisted nematic liquid crystal display device and an OCB liquid crystal display device has the following steps: [IV] aligning the liquid crystal alignment of the first and second substrates with the first and second substrates obtained by the liquid crystal The film is in a relative state to produce a step of aligning the liquid crystal display elements. In this way, a twisted nematic liquid crystal display element can be obtained. Hereinafter, each steps of [I] to [III], and [IV] which are included in the production method of the present invention will be described. <Step [I]> In the step [I], a liquid crystal alignment agent containing (A) a side chain type polymer and an organic solvent is applied onto a substrate having an electrode for driving a liquid crystal to form a coating film. <Substrate> The substrate is not particularly limited, and when the liquid crystal display element to be produced is of a penetrating type, it is preferable to use a substrate having high transparency. In this case, there is no particular limitation, and a glass substrate, a plastic substrate such as an acrylic substrate or a polycarbonate substrate, or the like can be used. The electrode for driving the liquid crystal is preferably ITO (Indium Tin Oxide) or IZO (Indium Zinc Oxide). Further, when the reflective liquid crystal display element is only a single-sided substrate, an opaque substance such as a germanium wafer may be used. In this case, a material such as aluminum which can reflect light may be used. As a method of forming an electrode on a substrate, a conventionally known method can be used. The method of applying the above liquid crystal alignment agent to a substrate having an electrode for driving a liquid crystal is not particularly limited. The coating method is industrially generally a method using screen printing, lithography, flexo printing, or inkjet method. Other coating methods include, for example, a wetting method, a roll coating method, a slit coating method, a spinning method (spin coating method), a spray method, and the like, and these methods can be used for the purpose. [0096] After applying the liquid crystal alignment agent to the substrate having the electrode for driving the liquid crystal, the solvent is heated at 50 to 230 ° C via a heating means such as a hot plate, a heat cycle type oven, or an IR (infrared) type oven. It is preferably carried out at 50 to 200 ° C for 0.4 minutes to 60 minutes, preferably 0.5 minutes to 10 minutes, to obtain a coating film. The drying temperature at this time is preferably lower in the temperature range in which the liquid crystallinity (hereinafter also referred to as liquid crystal generation temperature) of the side chain type polymer of the side chain type polymer of the component (A) is lower. . When the thickness of the coating film is too thick, the power consumption of the liquid crystal display element is disadvantageous. When the thickness is too thin, the liquid crystal display element may have a low reliability. Therefore, it is preferably 5 nm to 300 nm, more preferably 10 nm to 150 nm. . Further, after the step [I], before the subsequent step [II], a step of cooling the substrate on which the coating film is formed to room temperature may be provided. <Step [II]> The step [II] is that the polarized ultraviolet light is irradiated to the coating film obtained in the step [I] in an oblique direction. The polarized ultraviolet light is irradiated onto the film surface of the coating film, and the polarized light is irradiated to the substrate via the polarizing plate. As the ultraviolet rays to be used, for example, ultraviolet rays having a wavelength in the range of 100 nm to 400 nm can be used. It is preferred to select the optimum wavelength by a filter or the like in accordance with the type of the coating film to be used. Therefore, for example, in order to selectively initiate a photocrosslinking reaction, it is optional to use ultraviolet rays having a wavelength in the range of 290 nm to 400 nm. Ultraviolet rays, for example, can be used to generate radiation from a high pressure mercury lamp. [0098] The amount of ultraviolet light to be polarized varies depending on the coating film to be used. The amount of irradiation is such that the maximum value of ΔA (hereinafter, also referred to as ΔAmax) of the difference between the ultraviolet light absorbance in the direction parallel to the polarization direction of the polarized ultraviolet light and the ultraviolet absorbance in the vertical direction is polarized. The range of 1% to 70% of the amount is preferably in the range of 1% to 50%, preferably in the range of 1% to 50%. The irradiation direction of the polarized ultraviolet light is usually from 1 to 89, more preferably from 10 to 80, particularly preferably from 20 to 70 with respect to the substrate. When the angle is too small, there will be a problem that the pretilt angle is too small, and when it is too large, there is a problem that the pretilt angle is too high. [0100] The method of adjusting the irradiation direction to the above-described angle, for example, the method of tilting the substrate itself, and the method of tilting the light source, but also tilting the light source itself, is more preferable from the viewpoint of productivity. The pretilt angle obtained is preferably, for example, 1° to 20° which is suitable for the pretilt angle of the twisted nematic mode, and more preferably 2° to 15°. Further, in the present invention, the inclination angle may be controlled by adjusting the irradiation amount, the irradiation time, or both of the above step [II]. <Step [III]> In the step [III], the coating film after the polarized ultraviolet irradiation of the step [II] is heated. The coating film alignment control ability can be imparted by heating. For heating, a heating means such as a hot plate, a heat cycle type oven, or an IR (infrared) type oven can be used. The heating temperature can be determined at a temperature at which the liquid crystallinity of the coating film to be used is measured. The heating temperature is preferably in a temperature range in which the liquid crystallinity of the side chain type polymer is generated (hereinafter, also referred to as a temperature at which liquid crystal is generated). In the case of a film-like film surface, the temperature at which the liquid crystal is generated on the surface of the coating film is estimated to be lower than the temperature at which the liquid crystal is generated in the case of the side chain type polymer of the component (A). Therefore, the heating temperature is preferably in the temperature range of the temperature at which the liquid crystal is generated on the surface of the coating film. That is, the temperature range of the heating temperature after the polarized ultraviolet ray irradiation is lower than the lower limit of the temperature range of the temperature of the liquid crystal generated by the side chain type polymer used by 10 ° C, and is lower than the liquid crystal temperature range. The temperature at which the upper limit is lower by 10 ° C is preferably the temperature within the range of the upper limit. When the heating temperature is lower than the above temperature range, the effect of the anisotropic increase due to heat in the coating film may be insufficient, and when the heating temperature is higher than the above temperature range, the state of the coating film may be There is a tendency to approach the isotropic liquid state (isotropic phase), and in this case, there is a tendency that it is difficult to realign in one direction by self-organization. Further, the temperature at which the liquid crystal is generated refers to a glass transition temperature (Tg) or more when the surface of the side chain type polymer or the coating film is phase-transferred from the solid phase to the liquid crystal phase, and isotropic by liquid crystal phase isotropic. The phase (isotropic phase) is intended to mean the temperature below the isotropic phase transition temperature (Tiso). Further, in the present invention, the inclination angle can be controlled by adjusting the heating temperature, the heating time, or both of the above step [III]. The thickness of the coating film formed after heating is preferably from 5 nm to 300 nm, more preferably from 50 nm to 150 nm, for the same reason as described in the step [I]. According to the results of the above steps, in the production method of the present invention, the effect of introducing anisotropy into the coating film can be efficiently achieved. Therefore, the substrate with the liquid crystal alignment film can be efficiently manufactured. [Step [IV]> [IV] The step of providing the substrate obtained by disposing the liquid crystal alignment film on the substrate on the side of the liquid crystal alignment film, and the liquid crystal layer provided between the substrate and the substrate A liquid crystal display element having a liquid crystal lattice of the liquid crystal alignment film formed by the liquid crystal alignment agent of the present invention disposed between a substrate and a liquid crystal layer. The liquid crystal display elements of the present invention are, for example, a twisted nematic (TN: Twisted Nematic) method, a vertical alignment (VA: Vertical Alignment) method, or an IPS (In-Plane Switching) method, and an OCB alignment (OCB alignment). :Optically Compensated Bend) and other ways. [0110] For example, a liquid crystal cell or a liquid crystal display element is produced. For example, the first and second substrates are prepared, and the spacer is spread on the liquid crystal alignment film of the substrate on one side, and the liquid crystal alignment film surface is inside. In a manner, the other substrate is bonded to each other in such a manner that the ultraviolet exposure direction is perpendicular to each other, the liquid crystal is injected under reduced pressure, and the liquid crystal alignment film surface on which the spacer is dispersed is dropped into the liquid crystal. The method of bonding and sealing is exemplified. The diameter of the spacer at this time is preferably from 1 μm to 30 μm, more preferably from 2 μm to 10 μm. The spacer diameter determines the distance between the pair of substrates of the liquid crystal layer, that is, the thickness of the liquid crystal layer. The obtained liquid crystal display element is preferably subjected to an annealing treatment from the viewpoint of alignment stability. The heating temperature is a phase transition temperature of the liquid crystal, preferably 10 to 160 ° C, more preferably 50 to 140 ° C. The method for producing a substrate coated with a coating film according to the present invention is to apply a liquid crystal alignment agent onto a substrate to form a coating film, and then irradiate the polarized ultraviolet rays. Then, by heating, it is possible to introduce a highly efficient anisotropy into the side chain type polymer film, and to obtain a substrate having a liquid crystal alignment film having alignment control ability of liquid crystal. The coating film used in the present invention is a principle of molecular reorientation by liquid crystal self-organization which utilizes light reaction of a side chain, and can introduce high-efficiency anisotropy into a coating film. In the production method of the present invention, when a side chain type polymer has a photocrosslinkable group structure as a photoreactive group, a side chain type polymer is applied onto a substrate to form a coating film, and then the polarized light is irradiated. The ultraviolet ray is then heated to obtain a liquid crystal display element. Therefore, the coating film used in the method of the present invention can directly introduce anisotropic properties by irradiating the coating film with polarized ultraviolet rays and heat treatment results, and can form a liquid crystal having excellent alignment control ability. Orientation film. Therefore, the coating film used in the method of the present invention can optimize the irradiation amount of the polarized ultraviolet rays of the irradiation coating film and the heating temperature in the heat treatment. Therefore, it is possible to achieve anisotropic introduction of the coating film with high efficiency. In the coating film used in the present invention, the irradiation amount of the anisotropic optimal polarized ultraviolet ray can be introduced with high efficiency, and the photocrosslinking reaction or light corresponding to the photosensitive group in the coating film can be induced. The optimum amount of polarized ultraviolet light to be irradiated by the isomerization reaction. When the coating film used in the present invention is irradiated with polarized ultraviolet rays, if the photosensitive group of the side chain of the photocrosslinking reaction or the photoisomerization reaction is too small, a sufficient amount of photoreaction cannot be obtained. In this case, even if heating is subsequently performed, sufficient self-organization cannot be performed. On the other hand, in the coating film used in the present invention, when a structure having a photocrosslinkable group is irradiated with ultraviolet light by polarization, if the photosensitive group of the side chain in which the crosslinking reaction is carried out is excessive, the side chain will be caused. Excessive cross-linking reaction. In this case, the resulting film will be formed into a straightening, which causes self-organization to hinder subsequent heating. Therefore, in the coating film used in the present invention, the photosensitive group of the side chain can be subjected to an optimum amount of photocrosslinking reaction or photoisomerization reaction by irradiation with polarized ultraviolet rays to reach the side chain type. It is preferred that the polymer film has a photosensitive group in an amount of from 0.1 mol% to 60 mol%, preferably from 0.1 mol% to 40 mol%. When the amount of the photosensitive group of the side chain in which the photoreaction is carried out is in the above range, self-organization can be efficiently performed by the subsequent heat treatment, and high-efficiency anisotropy can be formed in the film. The coating film used in the method of the present invention can optimize the photo-crosslinking reaction or the photo-sensitization of the photosensitive group in the side chain of the side chain type polymer film by optimizing the irradiation amount of the polarized ultraviolet light. The amount of the compositional reaction, or the amount of the Friesrearrangement reaction, is optimized. Therefore, when combined with the subsequent heat treatment, the introduction of the anisotropic property to the coating film used in the present invention can be efficiently achieved. In this case, the amount of the polarized ultraviolet light is preferably adjusted in accordance with the evaluation of the ultraviolet absorption of the coating film used in the present invention. That is, the coating film used in the present invention is obtained by measuring ultraviolet absorption in a direction parallel to the polarization direction of the polarized ultraviolet light and absorption of ultraviolet rays in the vertical direction after the polarized ultraviolet light irradiation. From the measurement results of the ultraviolet absorption, the difference (ΔA) between the ultraviolet absorbance in the direction parallel to the polarization direction of the polarized ultraviolet light and the ultraviolet absorbance in the vertical direction was evaluated. Subsequently, the maximum value (ΔAmax) of ΔA achieved in the coating film used in the present invention and the amount of polarized ultraviolet light at which the maximum value can be realized are determined. In the production method of the present invention, the amount of polarized ultraviolet light which is irradiated in a desired amount in the production of the liquid crystal alignment film can be determined based on the amount of polarized ultraviolet light which can achieve the ΔAmax. In the production method of the present invention, the amount of the polarized ultraviolet light to be applied to the coating film used in the present invention is preferably in the range of 1% to 70% of the amount of the polarized ultraviolet ray having a ΔAmax, and is preferably 1% to 1%. Those within the range of 50% are preferred. In the coating film used in the present invention, the amount of polarized ultraviolet light in the range of 1% to 50% of the amount of polarized ultraviolet light of ΔAmax can be achieved, which corresponds to the sensitivity of the side chain type polymer film. The amount of polarized ultraviolet light of the photocrosslinking reaction is 0.1 mol% to 20 mol% of the entire base. As described above, in the production method of the present invention, the purpose of introducing a high-efficiency anisotropy to the coating film can be achieved by setting the liquid crystal temperature range of the side chain type polymer as a reference. The heating temperature can be. Therefore, for example, when the liquid crystal temperature range of the side chain type polymer used in the present invention is from 100 ° C to 200 ° C, the heating temperature after the polarized ultraviolet ray irradiation is preferably from 90 ° C to 190 ° C. Thus, a greater anisotropy can be imparted to the coating film used in the present invention. As described above, the liquid crystal display element provided by the present invention exhibits high reliability against external pressure such as light or heat. [0122] As described above, the substrate for a twisted nematic liquid crystal display device, the liquid crystal display device having the substrate, the substrate for an OCB liquid crystal display device, or the liquid crystal display device having the substrate, which is obtained by the method of the present invention, For those who have excellent reliability, they are suitable for use in large-screen and high-definition LCD TVs. Moreover, it is also used for a liquid crystal antenna, a dimming element, and the like. [0123] Hereinafter, the contents of the present invention will be described using examples, but the present invention is not limited by the examples.

[Examples] The abbreviations of the components used in the examples are as follows. <methacrylic acid monomer> [0125] [0126] MA-1 is a synthetic method described in the non-patent literature (Macromolecules 2002, 35, 706-713). MA-2 is a synthetic method according to the synthesis method described in British Patent GB 2306470B. MA-3 is a synthetic method described in the non-patent literature (Macromolecules 2007, 40, 6355-6360). MA-4 is synthesized by the synthesis method described in International Patent Publication No. WO2014/054785. MA-5 is synthesized by a synthesis method described in the patent document (Japanese Patent Laid-Open No. Hei 9-118717). MA-6 is purchased by Tokyo Chemical Industry Co., Ltd. MA-7 was purchased by Tokyo Chemical Industry Co., Ltd. MA-8 was purchased by Tokyo Chemical Industry Co., Ltd. MA-9 is purchased by Sigma Oric. <Organic solvent> THF: tetrahydrofuran NMP: N-methyl-2-pyrrolidone BCS: butyl cellosolve BCA: butyl cellosolve acetate CHN: cyclohexanone GBL: γ-butyl lactone PGME: Propylene glycol monomethyl ether PGMEA: propylene glycol monomethyl ether acetate <polymerization initiator> AIBN: 2,2'-azobisisobutyronitrile [Synthesis Example 1: methacrylic acid polymer] MA-1 (21 g: 40 mmol) and MA-2 (26 g: 60 mmol) were dissolved in THF (270 g), and degassed using a diaphragm (diaphragm) pump, and then AIBN (0.5 g: 3 mmol) was added, and then degassed. Subsequently, the reaction was carried out at 60 ° C for 6 hours to obtain a polymer solution of methyl acrylate. The polymer solution was added dropwise to methanol (2000 ml), and the resulting precipitate was filtered. This precipitate was washed with methanol and dried under reduced pressure to give a methyl acrylate polymer powder P1. According to the conditions shown in Table 1, in the same manner as in Synthesis Example 1, Synthesis Examples 2 and 3 were used to obtain methyl acrylate polymer powders P2 and P3. <Synthesis Example 4: Methacrylic acid polymer> MA-3 (23 g: 40 mmol) and MA-2 (26 g: 60 mmol) were dissolved in THF (282 g), and degassed using a membrane pump, and then added. After AIBN (0.5 g: 3 mmol), it was degassed again. Subsequently, the reaction was carried out at 60 ° C for 6 hours to obtain a polymer solution of methyl acrylate. The polymer solution was added dropwise to methanol (2000 ml), and the resulting precipitate was filtered. This precipitate was washed with methanol and dried under reduced pressure to give a methyl acrylate polymer powder P4. According to the conditions shown in Table 1, Synthesis Example 5 was also obtained in the same manner as in Synthesis Example 4 to obtain a methyl acrylate polymer powder P5. <Synthesis Example 6: Methacrylic acid polymer> MA-3 (23 g: 40 mmol) and MA-4 (31 g: 60 mmol) were dissolved in THF (310 g), and degassed using a membrane pump, and then added. After AIBN (0.5 g: 3 mmol), it was degassed again. Subsequently, the reaction was carried out at 60 ° C for 6 hours to obtain a polymer solution of methyl acrylate. The polymer solution was added dropwise to methanol (2000 ml), and the resulting precipitate was filtered. This precipitate was washed with methanol and dried under reduced pressure to give a methyl acrylate polymer powder P6. According to the conditions shown in Table 1, Synthesis Example 7 was also obtained in the same manner as in Synthesis Example 6, to obtain a methyl acrylate polymer powder P7. <Synthesis Example 8: Methacrylic acid polymer> MA-1 (21 g: 40 mmol), MA-2 (13 g: 30 mmol), and MA-4 (9 g: 30 mmol) were dissolved in THF (246 g), and used. After degassing the membrane pump, AIBN (0.5 g: 3 mmol) was added and then degassed. Subsequently, the reaction was carried out at 60 ° C for 6 hours to obtain a polymer solution of methyl acrylate. The polymer solution was added dropwise to methanol (2000 ml), and the resulting precipitate was filtered. This precipitate was washed with methanol and dried under reduced pressure to give a methyl acrylate polymer powder P8. According to the conditions shown in Table 1, Synthesis Example 9 was also obtained in the same manner as in Synthesis Example 8 to obtain a methyl acrylate polymer powder P9. <Synthesis Example 10: Methacrylic acid polymer> MA-1 (21 g: 40 mmol), MA-2 (26 g: 60 mmol), and MA-5 (2 g: 20 mmol) were dissolved in THF (280 g), and used. After degassing the membrane pump, AIBN (0.5 g: 3 mmol) was added and then degassed. Subsequently, the reaction was carried out at 60 ° C for 6 hours to obtain a polymer solution of methyl acrylate. The polymer solution was added dropwise to methanol (2000 ml), and the resulting precipitate was filtered. This precipitate was washed with methanol and dried under reduced pressure to give a methyl acrylate polymer powder P10. According to the conditions shown in Table 1, Synthesis Example 11 was also obtained in the same manner as in Synthesis Example 10 to obtain a methyl acrylate polymer powder P11. <Synthesis Example 12: Methacrylic acid polymer> MA-1 (21 g: 40 mmol), MA-2 (26 g: 60 mmol), and MA-7 (3 g: 10 mmol) were dissolved in THF (283 g), and used. After degassing the membrane pump, AIBN (0.5 g: 3 mmol) was added and then degassed. Subsequently, the reaction was carried out at 60 ° C for 6 hours to obtain a polymer solution of methyl acrylate. The polymer solution was added dropwise to methanol (2000 ml), and the resulting precipitate was filtered. This precipitate was washed with methanol and dried under reduced pressure to give a methyl acrylate polymer powder P12. According to the conditions shown in Table 1, in the synthesis examples 13 and 14, except that MA-7 of Synthesis Example 12 was replaced with MA-8 and MA-9, the same method was used to obtain methyl acrylate polymer powder. P13, 14. <Synthesis Example 15: Methacrylic acid polymer> A-3 (34 g: 60 mmol), MA-2 (9 g: 20 mmol), and MA-5 (6 g: 20 mmol) were dissolved in THF (282 g), and used. After degassing the membrane pump, AIBN (0.5 g: 3 mmol) was added and then degassed. Subsequently, the reaction was carried out at 60 ° C for 6 hours to obtain a polymer solution of methyl acrylate. The polymer solution was added dropwise to methanol (2000 ml), and the resulting precipitate was filtered. This precipitate was washed with methanol and dried under reduced pressure to give a methyl acrylate polymer powder P15. <Synthesis Example 16: Methacrylic acid polymer> MA-1 (21 g: 40 mmol) and MA-5 (6 g: 60 mmol) were dissolved in THF (154 g), and degassed using a membrane pump, and then added. After AIBN (0.5 g: 3 mmol), it was degassed again. Subsequently, the reaction was carried out at 60 ° C for 6 hours to obtain a polymer solution of methyl acrylate. The polymer solution was added dropwise to methanol (2000 ml), and the resulting precipitate was filtered. This precipitate was washed with methanol and dried under reduced pressure to give a methyl acrylate polymer powder P16. According to the conditions shown in Table 1, Synthesis Example 17 was also obtained in the same manner as in Synthesis Example 16 to obtain a methyl acrylate polymer powder P17. <Synthesis Example 18: Methacrylic acid polymer> MA-3 (46 g: 80 mmol) and MA-5 (6 g: 20 mmol) were dissolved in THF (297 g), and degassed using a diaphragm pump, and then added. After AIBN (0.5 g: 3 mmol), it was degassed again. Subsequently, the reaction was carried out at 60 ° C for 6 hours to obtain a polymer solution of methyl acrylate. The polymer solution was added dropwise to methanol (2000 ml), and the resulting precipitate was filtered. This precipitate was washed with methanol and dried under reduced pressure to give a methyl acrylate polymer powder P18. <Synthesis Example 19: Methacrylic acid polymer> MA-2 (44 g: 100 mmol) was dissolved in THF (251 g), and degassed using a membrane pump, and then AIBN (0.5 g: 3 mmol) was added thereto. Perform degassing again. Subsequently, the reaction was carried out at 60 ° C for 6 hours to obtain a polymer solution of methyl acrylate. The polymer solution was added dropwise to methanol (2000 ml), and the resulting precipitate was filtered. This precipitate was washed with methanol and dried under reduced pressure to give a methyl acrylate polymer powder P19. According to the conditions shown in Table 1, in the synthesis example 20, methyl acrylate polymer powder P21 was obtained by the same method except that MA-2 of Synthesis Example 19 was replaced with MA-3. <Preparation of liquid crystal alignment agent: A1> In the methyl acrylate polymer powder P1 (0.6 g) obtained in the above Synthesis Example 1, NMP (11.4 g) was added, and the mixture was stirred at room temperature for 1 hour to dissolve it. . To the solution, BCS (3.0 g) was added to obtain a polymer solution (A1) having a solid concentration of 4.0% by weight. The polymer solution can be used as a liquid crystal alignment agent for forming a liquid crystal alignment film. The liquid crystal alignment agents A2, A3, A5, A11, A12, A16 to A20, and related contents were all prepared in the same manner as in the liquid crystal alignment agent A1 according to the conditions shown in Table 1. <Preparation of Liquid Crystal Alignment Agent: B1> To a methyl acrylate polymer powder P16 (0.6 g) obtained in the above Synthesis Example 1, NMP (11.4 g) was added, and the mixture was stirred at room temperature for 1 hour. Let it dissolve. To the solution, BCS (3.0 g) was added to obtain a polymer solution (B1) having a solid concentration of 4.0% by weight. The polymer solution can be used as a liquid crystal alignment agent for forming a liquid crystal alignment film. According to the conditions shown in Table 1, the liquid crystal alignment agents B2, B4, and B5 were also prepared in the same manner as the liquid crystal alignment agent B1 to obtain a liquid crystal alignment agent. <Preparation of Liquid Crystal Alignment Agent: A4> To a methyl acrylate polymer powder P3 (0.6 g) obtained in the above Synthesis Example 1, NMP (9.9 g) was added, and the mixture was stirred at room temperature for 1 hour. Let it dissolve. To the solution, BCA (4.5 g) was added to obtain a polymer solution (A4) having a solid concentration of 4.0% by weight. The polymer solution can be used as a liquid crystal alignment agent for forming a liquid crystal alignment film. According to the conditions shown in Table 1, the liquid crystal alignment agents A6, A7, and A13 were also prepared in the same manner as the liquid crystal alignment agent A4 to obtain a liquid crystal alignment agent. <Preparation of Liquid Crystal Alignment Agent: A8> To the methyl acrylate polymer powder P5 (0.6 g) obtained in the above Synthesis Example 1, CHN (11.4 g) was added thereto, and the temperature was raised at a temperature of 50 ° C. Stir for 1 hour to dissolve. To the solution, PGME (3.0 g) was added to obtain a polymer solution (A8) having a solid concentration of 4.0% by weight. The polymer solution can be used as a liquid crystal alignment agent for forming a liquid crystal alignment film. According to the conditions shown in Table 1, the liquid crystal alignment agent A9 was prepared by the same method except that the PGME of the liquid crystal alignment agent A8 was replaced with PGMEA. <Preparation of Liquid Crystal Alignment Agent: A10> In the methyl acrylate polymer powder P5 (0.6 g) obtained in the above Synthesis Example 1, CHN (15.0 g) was added thereto, and the temperature was raised at a temperature of 50 ° C. After stirring for 1 hour, it was dissolved to obtain a polymer solution (A10) having a solid concentration of 4.0% by weight. The polymer solution can be used as a liquid crystal alignment agent for forming a liquid crystal alignment film. According to the conditions shown in Table 1, the liquid crystal alignment agents A15 and A21 were also prepared in the same manner as the liquid crystal alignment agent A10 to obtain a liquid crystal alignment agent. <Preparation of Liquid Crystal Alignment Agent: A14> To a methyl acrylate polymer powder P9 (0.6 g) obtained in the above Synthesis Example 1, NMP (5.4 g) was added, and the mixture was stirred at room temperature for 1 hour. Let it dissolve. To the solution, GBL (4.5 g) and BCA (4.5 g) were added to prepare a polymer solution (A14) having a solid concentration of 4.0% by weight. The polymer solution can be used as a liquid crystal alignment agent for forming a liquid crystal alignment film. According to the conditions shown in Table 1, in the liquid crystal alignment agent B3, the liquid crystal alignment agent was obtained by the same method except that the BCA of the liquid crystal alignment agent A14 was replaced with BCS. [0158] [Preparation of In-plane Order Parameter Measurement Substrate] Using the liquid crystal alignment agent obtained above, the substrate for photoreaction rate measurement was produced in the following order. The substrate was a quartz substrate having a size of 40 mm × 40 mm and a thickness of 1.0 mm. The liquid crystal alignment agent A1 was filtered using a filter having a filter aperture of 1.0 μm, and then spin-coated on a quartz substrate, and dried on a hot plate at 70 ° C for 90 seconds to form a liquid crystal alignment film having a film thickness of 100 nm. [0160] (Example 1) After 313 nm of ultraviolet light was irradiated to a coating film surface by a polarizing plate to 80 mJ/cm ² , it was heated on a hot plate at 120 ° C for 20 minutes to obtain a substrate on which a liquid crystal alignment film was completed. According to the conditions shown in Table 2, in Examples 2 to 21 and Comparative Examples 1 to 5, the substrate for in-plane indexing measurement was obtained in the same manner as in Example 1. <Measurement of In-Plane Alignment> Using the substrate with the liquid crystal alignment film prepared as described above, the absorbance of the polarized light used for measuring the optical anisotropy of the liquid crystal alignment film is calculated according to the following formula. In-plane alignment (S). The calculated value is the highest value within the range of exposures used. Further, the measurement of the absorbance was measured using an ultraviolet visible near-infrared ray spectrophotometer U-3100PC manufactured by Shimadzu Corporation. [0163] Wherein A _para represents an absorbance in a direction parallel to the direction in which the polarized light UV is irradiated, and A _per represents an absorbance in a direction perpendicular to a direction in which the polarized light UV is irradiated. When A _large indicates the absorbance in the parallel direction and the vertical direction, the absorbance of the larger value and A _small indicate the absorbance of the smaller value when comparing the absorbance in the parallel direction and the vertical direction. The absolute value of the in-plane orientation is closer to 1, indicating that the same alignment state can be achieved. [0165] As shown in Table 2, when the liquid crystal alignment agents of Examples 1 to 21 were used, the alignment degree in the direction parallel to the direction of any of the polarized lights was higher. It is presumed that the amount of the photosensitive group introduced is lower based on the reason that the parallel direction is not formed with the comparative examples 1 and 2, and the alignment resulting from the isomerization reaction is more superior than the dimerization reaction. The result. <Production of Liquid Crystal Lattice> The liquid crystal alignment agent (A1) was filtered through a 0.45 μm filter, and then spin-coated on a glass substrate with a transparent electrode, and dried on a hot plate at 70 ° C. After a second, a liquid crystal alignment film having a film thickness of 100 nm was formed. (Example 15) The coating film surface was inclined at 40°, the 313 nm ultraviolet light was irradiated to the substrate at 80 mJ/cm ² through a polarizing plate, and then heated on a hot plate at 140° C. for 20 minutes to obtain a liquid crystal alignment. The substrate of the film. Two sheets of the substrate with the liquid crystal alignment film were prepared, and a spacer of 4 μm was placed on the liquid crystal alignment film surface of the one substrate, and then the two substrates were combined in such a manner that the rubbing directions were parallel, and the liquid crystal injection port was left. Sealed around, a cell lattice with a cell gap (CellGap) of 4 μm was produced. After the liquid crystal MLC-2003 (manufactured by Mok Co., Ltd.) was injected into the empty lattice using a vacuum injection method, the injection port was sealed to obtain an antiparallel liquid crystal lattice. After heating at a temperature of 120 ° C for 30 minutes, the pretilt angle of the liquid crystal lattice was measured. According to the conditions shown in Table 3, the liquid crystal lattices were produced by the same methods as in Example 1 using Examples 16 to 42 and Comparative Examples 6 to 10, and the pretilt angle was measured. [0170] As shown in Table 3, the liquid crystal pretilt angle suitable for the twisted nematic mode can be obtained regardless of the use of any of the liquid crystal alignment agents of Examples 22 to 42. The reason why the pretilt angles were not generated in Comparative Examples 6 and 7 was supposed to be caused by the fact that no inclination angle occurred in one axial direction. In Comparative Example 9, although a good tilt angle was produced, the obtained liquid crystal alignment film was in a white turbid state. In Comparative Example 10, the inclination angle suitable for the twisted nematic mode was not found. Using the liquid crystal alignment agent A10, the substrate for in-plane orientation measurement was obtained in the same manner as in Example 1 under the conditions described in Table 4. Subsequently, the orientation and the pretilt angle were measured based on the above examples. As a result, as shown in Table 4, it was confirmed that the pretilt angle can be adjusted depending on the amount of the polarized ultraviolet rays or the present sintering conditions. [0173] <Preparation of Liquid Crystal Alignment Agent: A22> In the methyl acrylate polymer powder P15 (0.6 g) obtained in the above Synthesis Example 15, NMP (8.4 g) was added, and the mixture was stirred at room temperature for 1 hour. It dissolves. To the solution, BCS (6.0 g) was added to obtain a polymer solution (A22) having a solid concentration of 4.0% by weight. The polymer solution can be used as a liquid crystal alignment agent for forming a liquid crystal alignment film. Using the alignment agent A22, the measurement of the degree of alignment and the pretilt angle was carried out in the same manner. The results are shown in Table 5, showing an optimum pretilt angle of 9.9° in the OCB mode. [0176]

Claims (8)

A polymer composition comprising: a copolymer obtained from a monomer mixture containing (A) the following monomer (A-1) and monomer (A-2); monomer (A-1): having 1 cassia sulphate base, and 2 to 4 benzene rings which do not constitute cinnabar sulfhydryl sites, and monomers which are polymerizable; monomer (A-2): has 1 cassia base, and 1 does not A monomer which forms a benzene ring of a cinnabar base and a polymerizable group. (The above-mentioned gingival base portion and the benzene ring are those which may have a substituent). The polymer composition of claim 1, wherein the polymerizable group of the above monomer (A-1) and monomer (A-2) is an acrylic group or a methacryl group. The polymer composition of claim 1, wherein the monomer (A-1) and the monomer (A-2) are represented by the group represented by the following formula (1) and represented by the following formula (2) a monomer derived from a group of selected radical groups selected from the group; In the formula, A, B and D each independently represent a single bond, -O-, -CH ₂ -, -COO-, -OCO-, -CONH- or -NH-CO-; S is a carbon number of 1 to 12 An alkyl group in which the hydrogen atoms to be bonded are each independently and may be substituted by a halogen group; T is a single bond or a C1-C12 alkyl group, and the bonded hydrogen atoms may be substituted by a halogen group. When T represents a single bond, B also represents a single bond; Y ₁ is a divalent benzene ring; P ₁ , Q ₁ and Q ₂ are each independently composed of a benzene ring and an alicyclic hydrocarbon ring having 5 to 8 carbon atoms; a group selected from the group; R ₁ is a hydrogen atom, -CN, a halogen group, an alkyl group having 1 to 5 carbon atoms, a (carbonyl group having 1 to 5 carbon atoms) carbonyl group, a cycloalkyl group having 3 to 7 carbon atoms Or an alkoxy group having 1 to 5 carbon atoms; in Y ₁ , P ₁ , Q ₁ and Q ₂ , the hydrogen atoms bonded to the benzene ring are each independently and may be -CN, a halogen group or an alkyl group having 1 to 5 carbon atoms. , (C1-C5 alkyl) carbonyl, or a C 1 to 5 alkoxy group; X ₁ and X ₂ each independently represent a single bond, -O-, -COO- or -OCO-; n1 and n2 are each independently 0, 1 or 2, X ₁ is the number 2, X ₁ may be the same as each other or different Jieke, X ₂ is the number 2, X ₂ mutually Jieke may be the same or different; Q ₁ is the number 2, Q ₁ may be mutually the same or different Jieke, Q ₂ is the number 2, Q ₂ can serve as each other may be the same or different In the monomer (A-1), the total number of benzene rings other than Y ₁ is 2 to 4; in the monomer (A-2), the total number of benzene rings other than Y ₁ is 1; The bonding bond of the polymerizable group. A method for producing a substrate having a liquid crystal alignment film that imparts an alignment control function, comprising: [I] applying the polymer composition according to any one of claims 1 to 3 to a substrate having an electrode for driving a liquid crystal a step of forming a coating film; [II] a step of irradiating the polarized ultraviolet light to the coating film obtained by the inclined surface [I]; and [III] a step of heating the coating film obtained in [II]; By. A substrate characterized by having a liquid crystal alignment film produced by the method of claim 4. A twisted nematic liquid crystal display device characterized by having the substrate of claim 5. A method of manufacturing a liquid crystal display device having a twisted nematic liquid crystal display device, comprising: a step of preparing a substrate (first substrate) of the request item 5; [I'] any one of claims 1 to 4 a step of coating the polymer composition on the second substrate to form a coating film; [II'] a step of irradiating the coating film obtained by [I'] with polarized ultraviolet rays; and [III'] pair [II'] a step of heating the obtained coating film; a step of obtaining a second substrate having a liquid crystal alignment film imparting alignment control capability; and [IV] a liquid crystal alignment film of the first and second substrates via the liquid crystal in a relative state, The step of preparing the liquid crystal display element by arranging the first and second substrates in a direction in which the ultraviolet light exposure directions are perpendicular to each other, and producing the liquid crystal display element. A twisted nematic liquid crystal display element characterized by the method of claim 7.