JPWO2017170951A1 - Alignment layer forming composition - Google Patents

Abstract

The present invention provides a polymer composition for a liquid crystal alignment film capable of aligning a polymerizable liquid crystal composition when a polarizing element having high dichroism is obtained. The present invention provides a polymer composition containing (A) a photosensitive side chain polymer that exhibits liquid crystallinity in a predetermined temperature range, and (B) a dichroic dye and an organic solvent. . A substrate having a liquid crystal alignment film formed from the polymer composition is coated with a polymerizable liquid crystal composition on the alignment film, then dried by heating, and further irradiated with ultraviolet rays as necessary to obtain two colors. A highly polarizing element can be obtained. [Selection figure] None

Description

  The present invention relates to a polymer composition useful for forming an alignment layer for aligning a polymerizable liquid crystal composition to be a polarizing layer in forming a polarizing element.

  Conventionally, iodine has been widely used as a dichroic dye for polarizing plates used in liquid crystal displays and the like. However, since iodine-based polarizing films have a problem that heat resistance, light resistance, etc. are inferior, attempts have been made to use organic dichroic substances, that is, dichroic dyes.

  Conventionally, as a dichroic dye, for the purpose of obtaining high dichroism, a dye having an azo skeleton as a basic skeleton (Patent Documents 1 and 2) and a dye having an anthraquinone skeleton are often used.

  Moreover, as a manufacturing method of a polarizing plate, in addition to a method of stretching a polymer film containing iodine, a dichroic dye, or the like, a dye serving as a guest material was mixed with a liquid crystal compound serving as a host material as a coating type polarizing plate. A method of applying a liquid crystal composition to a substrate is known (Patent Document 3). Furthermore, in order to provide a more stable polarizing film, a method using a mixture of a crosslinkable liquid crystal and a polymerizable dichroic dye (Patent Document 4); adding a polymerizable non-liquid crystal solvent to the polymerizable liquid crystal compound, A method for producing an optical anisotropic body in which a non-liquid crystal solvent is left in the coating film to improve adhesion with other optical films (Patent Document 5); and a polymerization property including a polymerizable mesogenic compound and a dichroic dye There has also been proposed a method (Patent Document 6) in which a mesogen preparation is prepared and a polarizer is effectively prepared using the mesogen preparation in terms of time and cost.

JP 2011-213610 A JP-T-2006-525382 Special table 2008-547062 gazette JP-T-2004-535483 JP 2004-198480 A JP 2006-161051 Gazette

  At present, in order to enhance the absorption characteristics in the visible light region, it has been studied to add a dichroic dye having excellent absorption characteristics to the liquid crystalline composition. However, such dichroic dyes generally have a low solubility in a solvent, and thus there is a problem that it is difficult to blend them in a liquid crystal composition.

  Based on the above background, the present invention provides a polymer composition useful for forming an alignment layer for aligning a polymerizable liquid crystal composition to be a novel polarizing layer.

As a result of intensive studies to achieve the above problems, the present inventors have found the following invention.
<1> A polymer composition containing (A) a photosensitive side chain polymer that exhibits liquid crystallinity in a predetermined temperature range, (B) a dichroic dye, and an organic solvent.
<2> The polymer composition according to <1>, wherein the component (A) is a side chain polymer having a photosensitive side chain that undergoes photocrosslinking, photoisomerization, or photofleece transition.

式中、Ａ、Ｂ、Ｄはそれぞれ独立に、単結合、−Ｏ−、−ＣＨ_２−、−ＣＯＯ−、−ＯＣＯ−、−ＣＯＮＨ−、−ＮＨ−ＣＯ−、−ＣＨ＝ＣＨ−ＣＯ−Ｏ−、又は−Ｏ−ＣＯ−ＣＨ＝ＣＨ−を表す；
Ｓは、炭素原子数１〜１２のアルキレン基を表し、それらに結合する水素原子はハロゲン基に置き換えられていてもよい；
Ｔは、単結合または炭素原子数１〜１２のアルキレン基を表し、それらに結合する水素原子はハロゲン基に置き換えられていてもよい；
Ｙ_１は、１価のベンゼン環、ナフタレン環、ビフェニル環、フラン環、ピロール環および炭素原子数５〜８の脂環式炭化水素からなる群から選ばれる環を表すか、又はそれらの置換基から選ばれる同一又は相異なった２〜６の環が結合基Ｂを介して結合してなる基を表し、それらに結合する水素原子はそれぞれ独立に−ＣＯＯＲ_０（式中、Ｒ_０は水素原子又は炭素原子数１〜５のアルキル基を表す）、−ＮＯ_２、−ＣＮ、−ＣＨ＝Ｃ（ＣＮ）_２、−ＣＨ＝ＣＨ−ＣＮ、ハロゲン基、炭素原子数１〜５のアルキル基、又は炭素原子数１〜５のアルキルオキシ基で置換されてもよい；
Ｙ_２は、２価のベンゼン環、ナフタレン環、ビフェニル環、フラン環、ピロール環、炭素原子数５〜８の脂環式炭化水素、および、それらの組み合わせからなる群から選ばれる基を表し、それらに結合する水素原子はそれぞれ独立に−ＮＯ_２、−ＣＮ、−ＣＨ＝Ｃ（ＣＮ）_２、−ＣＨ＝ＣＨ−ＣＮ、ハロゲン基、炭素原子数１〜５のアルキル基、又は炭素原子数１〜５のアルキルオキシ基で置換されてもよい；
Ｒは、ヒドロキシ基、炭素原子数１〜６のアルコキシ基を表すか、又はＹ_１と同じ定義を表す；
Ｘは、単結合、−ＣＯＯ−、−ＯＣＯ−、−Ｎ＝Ｎ−、−ＣＨ＝ＣＨ−、−Ｃ≡Ｃ−、−ＣＨ＝ＣＨ−ＣＯ−Ｏ−、又は−Ｏ−ＣＯ−ＣＨ＝ＣＨ−を表し、Ｘの数が２となるときは、Ｘ同士は同一でも異なっていてもよい；
Ｃｏｕは、クマリン−６−イル基またはクマリン−７−イル基を表し、それらに結合する水素原子はそれぞれ独立に−ＮＯ_２、−ＣＮ、−ＣＨ＝Ｃ（ＣＮ）_２、−ＣＨ＝ＣＨ−ＣＮ、ハロゲン基、炭素原子数１〜５のアルキル基、又は炭素原子数１〜５のアルキルオキシ基で置換されてもよい；
ｑ１とｑ２は、一方が１で他方が０である；
ｑ３は０または１である；
Ｐ及びＱは、各々独立に、２価のベンゼン環、ナフタレン環、ビフェニル環、フラン環、ピロール環、炭素原子数５〜８の脂環式炭化水素、および、それらの組み合わせからなる群から選ばれる基を表し；ただし、Ｘが−ＣＨ＝ＣＨ−ＣＯ−Ｏ−、−Ｏ−ＣＯ−ＣＨ＝ＣＨ−である場合、−ＣＨ＝ＣＨ−が結合する側のＰ又はＱは芳香環である；
ｌ１は０または１である；
ｌ２は０〜２の整数である；
ｌ１とｌ２がともに０であるときは、Ｔが単結合であるときはＡも単結合を表す；
ｌ１が１であるときは、Ｔが単結合であるときはＢも単結合を表す；
Ｈ及びＩは、各々独立に、２価のベンゼン環、ナフタレン環、ビフェニル環、フラン環、ピロール環、およびそれらの組み合わせからなる群から選ばれる基を表す。<3> The polymer according to the above <1>, wherein the component (A) is a side chain polymer having any one type of photosensitive side chain selected from the group consisting of the following formulas (1) to (6): Composition.

In the formula, A, B, and D are each independently a single bond, —O—, —CH ₂ —, —COO—, —OCO—, —CONH—, —NH—CO—, —CH═CH—CO—. Represents O— or —O—CO—CH═CH—;
S represents an alkylene group having 1 to 12 carbon atoms, and a hydrogen atom bonded thereto may be replaced by a halogen group;
T represents a single bond or an alkylene group having 1 to 12 carbon atoms, and the hydrogen atom bonded thereto may be replaced by a halogen group;
Y ₁ represents a ring selected from the group consisting of a monovalent benzene ring, naphthalene ring, biphenyl ring, furan ring, pyrrole ring and alicyclic hydrocarbon having 5 to 8 carbon atoms, or a substituent thereof. 2 to 6 rings selected from the same or different from each other are bonded to each other via a bonding group B, and the hydrogen atoms bonded thereto are independently —COOR ₀ (wherein R ₀ is a hydrogen atom) or an alkyl group having 1 to 5 carbon _{atoms), - NO 2, -CN,} -CH = C (CN) 2, -CH = CH-CN, a halogen group, an alkyl group having 1 to 5 carbon atoms, Or may be substituted with an alkyloxy group having 1 to 5 carbon atoms;
Y ₂ represents a group selected from the group consisting of a divalent benzene ring, naphthalene ring, biphenyl ring, furan ring, pyrrole ring, alicyclic hydrocarbon having 5 to 8 carbon atoms, and combinations thereof; The hydrogen atoms bonded thereto are each independently —NO ₂ , —CN, —CH═C (CN) ₂ , —CH═CH—CN, a halogen group, an alkyl group having 1 to 5 carbon atoms, or the number of carbon atoms. Optionally substituted with 1 to 5 alkyloxy groups;
R represents a hydroxy group, an alkoxy group having 1 to 6 carbon atoms, or the same definition as Y ₁ ;
X is a single bond, —COO—, —OCO—, —N═N—, —CH═CH—, —C≡C—, —CH═CH—CO—O—, or —O—CO—CH═. When CH is 2 and the number of X is 2, X may be the same or different;
Cou represents coumarin-6-yl group or a coumarin-7-yl group, _-NO 2 are each a hydrogen atom bonded to them _{independently, -CN, -CH = C (CN} ) 2, -CH = CH- May be substituted with CN, a halogen group, an alkyl group having 1 to 5 carbon atoms, or an alkyloxy group having 1 to 5 carbon atoms;
one of q1 and q2 is 1 and the other is 0;
q3 is 0 or 1;
P and Q are each independently selected from the group consisting of a divalent benzene ring, naphthalene ring, biphenyl ring, furan ring, pyrrole ring, alicyclic hydrocarbon having 5 to 8 carbon atoms, and combinations thereof. However, when X is —CH═CH—CO—O— or —O—CO—CH═CH—, P or Q on the side to which —CH═CH— is bonded is an aromatic ring. ;
l1 is 0 or 1;
l2 is an integer from 0 to 2;
when l1 and l2 are both 0, A represents a single bond when T is a single bond;
when l1 is 1, B represents a single bond when T is a single bond;
H and I each independently represent a group selected from the group consisting of a divalent benzene ring, naphthalene ring, biphenyl ring, furan ring, pyrrole ring, and combinations thereof.

式中、Ａ、Ｂ、ｑ１及びｑ２は上記と同じ定義を有する；
Ｙ_３は、１価のベンゼン環、ナフタレン環、ビフェニル環、フラン環、窒素含有複素環、及び炭素原子数５〜８の脂環式炭化水素、および、それらの組み合わせからなる群から選ばれる基を表し、それらに結合する水素原子はそれぞれ独立に−ＮＯ_２、−ＣＮ、ハロゲン基、炭素原子数１〜５のアルキル基、又は炭素原子数１〜５のアルキルオキシ基で置換されてもよい；
Ｒ_３は、水素原子、−ＮＯ_２、−ＣＮ、−ＣＨ＝Ｃ（ＣＮ）_２、−ＣＨ＝ＣＨ−ＣＮ、ハロゲン基、１価のベンゼン環、ナフタレン環、ビフェニル環、フラン環、窒素含有複素環、炭素原子数５〜８の脂環式炭化水素、炭素原子数１〜１２のアルキル基、又は炭素原子数１〜１２のアルコキシ基を表す；
ｌは１〜１２の整数を表し、ｍは０から２の整数であり、但し、式（２５）〜（２６）において、全てのｍの合計は２以上であり、式（２７）〜（２８）において、全てのｍの合計は１以上であり、ｍ１、ｍ２およびｍ３は、それぞれ独立に１〜３の整数である；
Ｒ_２は、水素原子、−ＮＯ_２、−ＣＮ、ハロゲン基、１価のベンゼン環、ナフタレン環、ビフェニル環、フラン環、窒素含有複素環、及び炭素原子数５〜８の脂環式炭化水素、および、アルキル基、又はアルキルオキシ基を表す；
Ｚ_１、Ｚ_２は単結合、−ＣＯ−、−ＣＨ_２Ｏ−、−ＣＨ＝Ｎ−、−ＣＦ_２−を表す。<4> The above <1> to <3>, wherein the component (A) is a side chain polymer having any one liquid crystalline side chain selected from the group consisting of the following formulas (21) to (31): The polymer composition according to any one of the above

In which A, B, q1 and q2 have the same definition as above;
Y ₃ is a group selected from the group consisting of a monovalent benzene ring, naphthalene ring, biphenyl ring, furan ring, nitrogen-containing heterocycle, alicyclic hydrocarbon having 5 to 8 carbon atoms, and combinations thereof. And the hydrogen atom bonded thereto may be independently substituted with —NO ₂ , —CN, a halogen group, an alkyl group having 1 to 5 carbon atoms, or an alkyloxy group having 1 to 5 carbon atoms. ;
R ₃ is a hydrogen atom, —NO ₂ , —CN, —CH═C (CN) ₂ , —CH═CH—CN, halogen group, monovalent benzene ring, naphthalene ring, biphenyl ring, furan ring, nitrogen-containing A heterocyclic ring, an alicyclic hydrocarbon having 5 to 8 carbon atoms, an alkyl group having 1 to 12 carbon atoms, or an alkoxy group having 1 to 12 carbon atoms;
l represents an integer of 1 to 12, m is an integer of 0 to 2, provided that in formulas (25) to (26), the sum of all m is 2 or more, and formulas (27) to (28 ), The sum of all m is 1 or more, and m1, m2 and m3 are each independently an integer of 1 to 3;
R ₂ represents a hydrogen atom, —NO ₂ , —CN, a halogen group, a monovalent benzene ring, a naphthalene ring, a biphenyl ring, a furan ring, a nitrogen-containing heterocyclic ring, and an alicyclic hydrocarbon having 5 to 8 carbon atoms. And represents an alkyl group or an alkyloxy group;
Z ₁ and Z _{2 each} represents a single bond, —CO—, —CH ₂ O—, —CH═N—, or —CF ₂ —.

（式中、Ｒ^１０１、Ｒ^１０２、Ｒ^１０３、Ｒ^１０４及びＲ^１０５のうちいずれか３つ乃至５つは、それぞれ独立に水素原子、ハロゲン原子、Ｃ_１〜Ｃ_６アルキル、Ｃ_１〜Ｃ_６ハロアルキル、Ｃ_１〜Ｃ_６アルコキシ、Ｃ_１〜Ｃ_６ハロアルコキシ、Ｃ_３〜Ｃ_８シクロアルキル、Ｃ_３〜Ｃ_８ハロシクロアルキル、Ｃ_２〜Ｃ_６アルケニル、Ｃ_２〜Ｃ_６ハロアルケニル、Ｃ_３〜Ｃ_８シクロアルケニル、Ｃ_３〜Ｃ_８ハロシクロアルケニル、Ｃ_２〜Ｃ_６アルキニル、Ｃ_２〜Ｃ_６ハロアルキニル、Ｃ_１〜Ｃ_６アルコキシ、Ｃ_１〜Ｃ_６ハロアルコキシ、（Ｃ_１〜Ｃ_６アルキル）カルボニル、（Ｃ_１〜Ｃ_６ハロアルキル）カルボニル、（Ｃ_１〜Ｃ_６アルコキシ）カルボニル、（Ｃ_１〜Ｃ_６ハロアルコキシ）カルボニル、（Ｃ_１〜Ｃ_６アルキルアミノ）カルボニル、（Ｃ_１〜Ｃ_６ハロアルキル）アミノカルボニル、ジ（Ｃ_１〜Ｃ_６アルキル）アミノカルボニル、シアノ及びニトロからなる群から選ばれる置換基を表し、Ｒ^１０１、Ｒ^１０２、Ｒ^１０３、Ｒ^１０４及びＲ^１０５のうちいずれか３つ乃至４つが上記の定義である場合、Ｒ^１０１、Ｒ^１０２、Ｒ^１０３、Ｒ^１０４及びＲ^１０５のうちの残り１つ又は２つは下記式（ｃ−２）

（式（ｃ−２）中、破線は結合手を表し、Ｒ^１０６は炭素原子数１〜３０のアルキレン基、フェニレンまたは二価の炭素環若しくは複素環を表し、このアルキレン基、フェニレンまたは二価の炭素環若しくは複素環中の１つ若しくは複数の水素原子は、フッ素原子又は有機基で置き換えられていてもよい。また、Ｒ^１０６中の−ＣＨ_２ＣＨ_２−が−ＣＨ＝ＣＨ−に置き換えられていてもよく、Ｒ^１０６中の−ＣＨ_２−は、フェニレンまたは二価の炭素環若しくは複素環に置き換えられていてもよく、さらに、次に挙げるいずれかの基が互いに隣り合わない場合において、これらの基に置き換えられていてもよい；−Ｏ−、−ＮＨＣＯ−、−ＣＯＮＨ−、−ＣＯＯ−、−ＯＣＯ−、−ＮＨ−、−ＮＨＣＯＮＨ−、−ＣＯ−。Ｒ^１０７は水素原子又はメチル基を表す。）で表される基を表し、ｎは０または１を表す。）
＜６＞ 上記＜１＞〜＜５＞のいずれかに記載の重合体組成物を含有する配向層形成組成物。<5> The polymer composition as described in any one of <1> to <4> above, which contains a compound represented by the following formula (c) as the component (C).

(In the formula, any three to five of R ¹⁰¹ , R ¹⁰² , R ¹⁰³ , R ¹⁰⁴ and R ¹⁰⁵ are each independently a hydrogen atom, a halogen atom, C ₁ -C ₆ alkyl, C ₁ -C _6. Haloalkyl, C ₁ -C ₆ alkoxy, C ₁ -C ₆ haloalkoxy, C ₃ -C ₈ cycloalkyl, C ₃ -C ₈ halocycloalkyl, C ₂ -C ₆ alkenyl, C ₂ -C ₆ haloalkenyl, C ₃ -C _{8 cycloalkenyl,} C 3 -C ₈ halocycloalkyl _{cycloalkenyl,} C 2 -C _{6 alkynyl,} C 2 -C _{6 haloalkynyl,} C 1 -C _{6 alkoxy,} C 1 -C ₆ haloalkoxy, _(C 1 ~ C ₆ alkyl) _{carbonyl, (C} 1 _{~C 6} haloalkyl) _{carbonyl, (C} 1 _{~C 6} alkoxy) _{carbonyl, (C} 1 _{~C 6} haloalkoxy) carbonyl _(C 1 -C ₆ alkylamino) _carbonyl, represents _(C 1 -C ₆ haloalkyl) aminocarbonyl, di _(C 1 -C ₆ alkyl) aminocarbonyl, a substituent selected from the group consisting of cyano and ^{nitro, R 101} , R ¹⁰² , R ¹⁰³ , R ^104, and R ¹⁰⁵ are defined as above, and the remaining one or two of R ¹⁰¹ , R ¹⁰² , R ¹⁰³ , R ^104, and R ¹⁰⁵ is 2 or 2 The following formula (c-2)

(In the formula (c-2), a broken line represents a bond, and R ¹⁰⁶ represents an alkylene group having 1 to 30 carbon atoms, phenylene, a divalent carbocyclic or heterocyclic ring, and the alkylene group, phenylene or divalent. One or a plurality of hydrogen atoms in the carbocycle or heterocycle may be replaced with a fluorine atom or an organic group, and —CH ₂ CH ₂ — in R ¹⁰⁶ is replaced with —CH═CH—. -CH _2-in R ¹⁰⁶ may be replaced by phenylene or a divalent carbocyclic or heterocyclic ring, and when any of the following groups is not adjacent to each other: , may be substituted with these groups; -O -, - NHCO -, - CONH -, - COO -, - OCO -, - NH -, - NHCONH -, - CO-.R 107 water Represents a prime atom or a methyl group.), And n represents 0 or 1. )
<6> An alignment layer forming composition containing the polymer composition according to any one of <1> to <5>.

  ADVANTAGE OF THE INVENTION According to this invention, the novel polymer composition which can be used in order to obtain the polarizing plate which has high polarization performance, without mix | blending a dichroic pigment | dye with a liquid crystalline composition highly can be provided. .

As a result of intensive studies, the inventor has obtained the following knowledge and completed the present invention.
The polymer composition of the present invention comprises a photosensitive side chain polymer capable of exhibiting liquid crystallinity (hereinafter, also simply referred to as a side chain polymer) and a dichroic dye. The coating film obtained by using the composition is a film having a photosensitive side chain polymer that can exhibit liquid crystallinity. This coating film can be subjected to orientation treatment by irradiation with polarized light without being subjected to rubbing treatment. And after polarized light irradiation, it will become the coating film (henceforth an orientation layer) to which the orientation control ability was given through the process of heating the side chain type polymer film. At this time, the slight anisotropy developed by the irradiation of polarized light becomes a driving force, and the liquid crystalline side chain polymer itself is efficiently reoriented by self-organization. As a result, a highly efficient alignment process can be realized as the alignment layer, and an alignment layer with high alignment control ability can be obtained. Here, when the polymer composition contains a dichroic dye, an alignment layer having a high dichroic ratio can be obtained. Therefore, the polymer composition of the present invention is an alignment layer forming composition for aligning a polarizing layer containing a liquid crystalline composition and, if necessary, a dichroic dye when forming a polarizing layer. Useful.

  Hereinafter, embodiments of the present invention will be described in detail.

<< (A) Photosensitive side chain polymer that exhibits liquid crystallinity in a predetermined temperature range >>
The component (A) is a photosensitive side chain polymer that exhibits liquid crystallinity within a predetermined temperature range.
(A) The side chain polymer preferably reacts with light in the wavelength range of 250 nm to 400 nm and exhibits liquid crystallinity in the temperature range of 60 ° C to 300 ° C.
The (A) side chain polymer preferably has a photosensitive side chain that reacts with light in the wavelength range of 250 nm to 400 nm.
(A) The side chain polymer preferably has a mesogenic group in order to exhibit liquid crystallinity in a temperature range of 60 ° C to 300 ° C.

  (A) The side chain type polymer has a photosensitive side chain bonded to the main chain, and can react with light to cause a crosslinking reaction, an isomerization reaction, or a light fleece rearrangement. The structure of the side chain having photosensitivity is not particularly limited, but a structure that undergoes a crosslinking reaction or photofleece rearrangement in response to light is desirable, and a structure that causes a crosslinking reaction is more desirable. In this case, even if exposed to external stress such as heat, the achieved orientation control ability can be stably maintained for a long period of time. The structure of the photosensitive side chain polymer film capable of exhibiting liquid crystallinity is not particularly limited as long as it satisfies such characteristics, but it is preferable to have a rigid mesogenic component in the side chain structure. In this case, stable liquid crystal alignment can be obtained when the side chain polymer is used as a liquid crystal alignment film.

  The polymer structure has, for example, a main chain and a side chain bonded to the main chain, and the side chain includes a mesogenic component such as a biphenyl group, a terphenyl group, a phenylcyclohexyl group, a phenylbenzoate group, and an azobenzene group, and a tip. A structure having a photosensitive group bonded to a moiety, which undergoes a crosslinking reaction or an isomerization reaction in response to light, or a main chain and a side chain bonded to the main chain, and the side chain also serves as a mesogenic component, and A structure having a phenylbenzoate group that undergoes a photo-Fries rearrangement reaction can be obtained.

式中、Ａ、Ｂ、Ｄはそれぞれ独立に、単結合、−Ｏ−、−ＣＨ_２−、−ＣＯＯ−、−ＯＣＯ−、−ＣＯＮＨ−、−ＮＨ−ＣＯ−、−ＣＨ＝ＣＨ−ＣＯ−Ｏ−、又は−Ｏ−ＣＯ−ＣＨ＝ＣＨ−を表す；
Ｓは、炭素原子数１〜１２のアルキレン基を表し、それらに結合する水素原子はハロゲン基に置き換えられていてもよい；
Ｔは、単結合または炭素原子数１〜１２のアルキレン基を表し、それらに結合する水素原子はハロゲン基に置き換えられていてもよい；
Ｙ_１は、１価のベンゼン環、ナフタレン環、ビフェニル環、フラン環、ピロール環および炭素原子数５〜８の脂環式炭化水素からなる群から選ばれる環を表すか、又はそれらの置換基から選ばれる同一又は相異なった２〜６の環が結合基Ｂを介して結合してなる基を表し、それらに結合する水素原子はそれぞれ独立に−ＣＯＯＲ_０（式中、Ｒ_０は水素原子又は炭素原子数１〜５のアルキル基を表す）、−ＮＯ_２、−ＣＮ、−ＣＨ＝Ｃ（ＣＮ）_２、−ＣＨ＝ＣＨ−ＣＮ、ハロゲン基、炭素原子数１〜５のアルキル基、又は炭素原子数１〜５のアルキルオキシ基で置換されてもよい；
Ｙ_２は、２価のベンゼン環、ナフタレン環、ビフェニル環、フラン環、ピロール環、炭素原子数５〜８の脂環式炭化水素、および、それらの組み合わせからなる群から選ばれる基を表し、それらに結合する水素原子はそれぞれ独立に−ＮＯ_２、−ＣＮ、−ＣＨ＝Ｃ（ＣＮ）_２、−ＣＨ＝ＣＨ−ＣＮ、ハロゲン基、炭素原子数１〜５のアルキル基、又は炭素原子数１〜５のアルキルオキシ基で置換されてもよい；
Ｒは、ヒドロキシ基、炭素原子数１〜６のアルコキシ基を表すか、又はＹ_１と同じ定義を表す；
Ｘは、単結合、−ＣＯＯ−、−ＯＣＯ−、−Ｎ＝Ｎ−、−ＣＨ＝ＣＨ−、−Ｃ≡Ｃ−、−ＣＨ＝ＣＨ−ＣＯ−Ｏ−、又は−Ｏ−ＣＯ−ＣＨ＝ＣＨ−を表し、Ｘの数が２となるときは、Ｘ同士は同一でも異なっていてもよい；
Ｃｏｕは、クマリン−６−イル基またはクマリン−７−イル基を表し、それらに結合する水素原子はそれぞれ独立に−ＮＯ_２、−ＣＮ、−ＣＨ＝Ｃ（ＣＮ）_２、−ＣＨ＝ＣＨ−ＣＮ、ハロゲン基、炭素原子数１〜５のアルキル基、又は炭素原子数１〜５のアルキルオキシ基で置換されてもよい；
ｑ１とｑ２は、一方が１で他方が０である；
ｑ３は０または１である；
Ｐ及びＱは、各々独立に、２価のベンゼン環、ナフタレン環、ビフェニル環、フラン環、ピロール環、炭素原子数５〜８の脂環式炭化水素、および、それらの組み合わせからなる群から選ばれる基を表し；ただし、Ｘが−ＣＨ＝ＣＨ−ＣＯ−Ｏ−、−Ｏ−ＣＯ−ＣＨ＝ＣＨ−である場合、−ＣＨ＝ＣＨ−が結合する側のＰ又はＱは芳香環を表し；
ｌ１は０または１である；
ｌ２は０〜２の整数である；
ｌ１とｌ２がともに０であるときは、Ｔが単結合であるときはＡも単結合を表す；
ｌ１が１であるときは、Ｔが単結合であるときはＢも単結合を表す；
Ｈ及びＩは、各々独立に、２価のベンゼン環、ナフタレン環、ビフェニル環、フラン環、ピロール環、およびそれらの組み合わせからなる群から選ばれる基を表す。More specific examples of the structure of the photosensitive side chain polymer film that can exhibit liquid crystallinity include hydrocarbon, (meth) acrylate, itaconate, fumarate, maleate, α-methylene-γ-butyrolactone, styrene, It has a main chain composed of at least one selected from the group consisting of radically polymerizable groups such as vinyl, maleimide, norbornene and siloxane, and a side chain composed of at least one of the following formulas (1) to (6) A structure is preferred.

In the formula, A, B, and D are each independently a single bond, —O—, —CH ₂ —, —COO—, —OCO—, —CONH—, —NH—CO—, —CH═CH—CO—. Represents O— or —O—CO—CH═CH—;
S represents an alkylene group having 1 to 12 carbon atoms, and a hydrogen atom bonded thereto may be replaced by a halogen group;
T represents a single bond or an alkylene group having 1 to 12 carbon atoms, and the hydrogen atom bonded thereto may be replaced by a halogen group;
Y ₁ represents a ring selected from the group consisting of a monovalent benzene ring, naphthalene ring, biphenyl ring, furan ring, pyrrole ring and alicyclic hydrocarbon having 5 to 8 carbon atoms, or a substituent thereof. 2 to 6 rings selected from the same or different from each other are bonded to each other via a bonding group B, and the hydrogen atoms bonded thereto are independently —COOR ₀ (wherein R ₀ is a hydrogen atom) or an alkyl group having 1 to 5 carbon _{atoms), - NO 2, -CN,} -CH = C (CN) 2, -CH = CH-CN, a halogen group, an alkyl group having 1 to 5 carbon atoms, Or may be substituted with an alkyloxy group having 1 to 5 carbon atoms;
Y ₂ represents a group selected from the group consisting of a divalent benzene ring, naphthalene ring, biphenyl ring, furan ring, pyrrole ring, alicyclic hydrocarbon having 5 to 8 carbon atoms, and combinations thereof; The hydrogen atoms bonded thereto are each independently —NO ₂ , —CN, —CH═C (CN) ₂ , —CH═CH—CN, a halogen group, an alkyl group having 1 to 5 carbon atoms, or the number of carbon atoms. Optionally substituted with 1 to 5 alkyloxy groups;
R represents a hydroxy group, an alkoxy group having 1 to 6 carbon atoms, or the same definition as Y ₁ ;
X is a single bond, —COO—, —OCO—, —N═N—, —CH═CH—, —C≡C—, —CH═CH—CO—O—, or —O—CO—CH═. When CH is 2 and the number of X is 2, X may be the same or different;
Cou represents coumarin-6-yl group or a coumarin-7-yl group, _-NO 2 are each a hydrogen atom bonded to them _{independently, -CN, -CH = C (CN} ) 2, -CH = CH- May be substituted with CN, a halogen group, an alkyl group having 1 to 5 carbon atoms, or an alkyloxy group having 1 to 5 carbon atoms;
one of q1 and q2 is 1 and the other is 0;
q3 is 0 or 1;
P and Q are each independently selected from the group consisting of a divalent benzene ring, naphthalene ring, biphenyl ring, furan ring, pyrrole ring, alicyclic hydrocarbon having 5 to 8 carbon atoms, and combinations thereof. However, when X is —CH═CH—CO—O— or —O—CO—CH═CH—, P or Q on the side to which —CH═CH— is bonded represents an aromatic ring. ;
l1 is 0 or 1;
l2 is an integer from 0 to 2;
when l1 and l2 are both 0, A represents a single bond when T is a single bond;
when l1 is 1, B represents a single bond when T is a single bond;
H and I each independently represent a group selected from the group consisting of a divalent benzene ring, naphthalene ring, biphenyl ring, furan ring, pyrrole ring, and combinations thereof.

The side chain may be any one type of photosensitive side chain selected from the group consisting of the following formulas (7) to (10).
In which A, B, D, Y ₁ , X, Y ₂ and R have the same definition as above;
l represents an integer of 1 to 12;
m represents an integer of 0 to 2, m1 and m2 represent an integer of 1 to 3;
n represents an integer of 0 to 12 (however, when n = 0, B is a single bond).

The side chain may be any one type of photosensitive side chain selected from the group consisting of the following formulas (11) to (13).
In the formula, A, X, l, m and R have the same definition as above.

The side chain may be a photosensitive side chain represented by the following formula (14) or (15).
In the formula, A, Y ₁ , X, 1, m1, and m2 have the same definition as above.

The side chain may be a photosensitive side chain represented by the following formula (16) or (17).
In the formula, A, X, l and m have the same definition as above.

The side chain is preferably a photosensitive side chain represented by the following formula (18) or (19).
In the formula, A, B, Y ₁ , l, q1, q2, m1, and m2 have the same definition as above.
R ₁ is a hydrogen atom, —NO ₂ , —CN, —CH═C (CN) ₂ , —CH═CH—CN, a halogen group, an alkyl group having 1 to 5 carbon atoms, or 1 to 5 carbon atoms. Represents an alkyloxy group.

The side chain is preferably a photosensitive side chain represented by the following formula (20).
In the formula, A, Y ₁ , X, l and m have the same definition as above.

The (A) side chain polymer preferably has any one liquid crystalline side chain selected from the group consisting of the following formulas (21) to (31).
In which A, B, q1 and q2 have the same definition as above;
Y ₃ is a group selected from the group consisting of a monovalent benzene ring, naphthalene ring, biphenyl ring, furan ring, nitrogen-containing heterocycle, alicyclic hydrocarbon having 5 to 8 carbon atoms, and combinations thereof. And the hydrogen atom bonded thereto may be independently substituted with —NO ₂ , —CN, a halogen group, an alkyl group having 1 to 5 carbon atoms, or an alkyloxy group having 1 to 5 carbon atoms. ;
R ₃ is a hydrogen atom, —NO ₂ , —CN, —CH═C (CN) ₂ , —CH═CH—CN, halogen group, monovalent benzene ring, naphthalene ring, biphenyl ring, furan ring, nitrogen-containing A heterocyclic ring, an alicyclic hydrocarbon having 5 to 8 carbon atoms, an alkyl group having 1 to 12 carbon atoms, or an alkoxy group having 1 to 12 carbon atoms;
l represents an integer of 1 to 12, m represents an integer of 0 to 2, provided that in formulas (25) to (26), the sum of all m is 2 or more, and formulas (27) to (28 ), The sum of all m is 1 or more, and m1, m2 and m3 each independently represents an integer of 1 to 3;
R ₂ represents a hydrogen atom, —NO ₂ , —CN, a halogen group, a monovalent benzene ring, a naphthalene ring, a biphenyl ring, a furan ring, a nitrogen-containing heterocyclic ring, and an alicyclic hydrocarbon having 5 to 8 carbon atoms. And represents an alkyl group or an alkyloxy group;
Z ₁ and Z _{2 each} represents a single bond, —CO—, —CH ₂ O—, —CH═N—, or —CF ₂ —.

<< Production Method of Photosensitive Side Chain Polymer >>
The photosensitive side chain polymer capable of exhibiting the above liquid crystallinity can be obtained by polymerizing the photoreactive side chain monomer having the above photosensitive side chain and the liquid crystalline side chain monomer.

[Photoreactive side chain monomer]
The photoreactive side chain monomer is a monomer capable of forming a polymer having a photosensitive side chain at the side chain portion of the polymer when the polymer is formed q.
As the photoreactive group possessed by the side chain, the following structures and derivatives thereof are preferred.

  More specific examples of the photoreactive side chain monomer include radical polymerizable groups such as hydrocarbon, (meth) acrylate, itaconate, fumarate, maleate, α-methylene-γ-butyrolactone, styrene, vinyl, maleimide and norbornene. And a polymerizable side group composed of at least one selected from the group consisting of siloxane and a photosensitive side chain consisting of at least one of the above formulas (1) to (6), preferably, for example, the above formula (7 ) To (10), a photosensitive side chain comprising at least one of the above formulas (11) to (13), and a photosensitivity represented by the above formula (14) or (15). A photosensitive side chain, a photosensitive side chain represented by the above formula (16) or (17), a photosensitive side chain represented by the above formula (18) or (19), and a photosensitivity represented by the above formula (20). Has sex side chain It is preferable that the structure be

Examples of such photoreactive side chain monomers include monomers selected from the group consisting of the following formulas M1-1 to M1-7 and M1-17 to M1-20.

（式中、Ｍ１は水素原子又はメチル基であり、ｓ１はメチレン基の数を表し、２乃至９の自然数である。）

(In the formula, M1 is a hydrogen atom or a methyl group, s1 represents the number of methylene groups, and is a natural number of 2 to 9.)

（式中、ＲはＯＨまたはＮＨ_２であり、Ｍ１は水素原子又はメチル基を表し、ｓ１はメチレン基の数を表し、２乃至９の自然数である。）

(Wherein, R is OH or NH _2, M1 represents a hydrogen atom or a methyl group, s1 represents the number of methylene groups is a natural number of 2 to 9.)

Examples of the photoreactive side chain monomer represented by the above formula (M1-1) include 4- (6-methacryloxyhexyl-1-oxy) cinnamic acid, 4- (6-acryloxyhexyl-1- (Oxy) cinnamic acid, 4- (3-methacryloxypropyl-1-oxy) cinnamic acid, 4- (4- (6-methacryloxyhexyl-1-oxy) benzoyloxy) cinnamic acid, R in M1-1) represents OH, and 4- (6-methacryloxyhexyl-1-oxy) cinnamamide, 4- (6-acryloxyhexyl-1-oxy) cinnamamide, 4- (3-methacryloxy) And those wherein R in formula (M1-1) represents NH ₂ such as propyl-1-oxy) cinnamamide.

[Liquid crystal side chain monomer]
The liquid crystalline side chain monomer is a monomer in which a polymer derived from the monomer exhibits liquid crystallinity and the polymer can form a mesogenic group at a side chain site.
As a mesogenic group having a side chain, even if it is a group having a mesogen structure alone such as biphenyl or phenylbenzoate, or a group having a mesogen structure by hydrogen bonding between side chains such as benzoic acid Good. As the mesogenic group possessed by the side chain, the following structure is preferable.

  More specific examples of the liquid crystalline side chain monomer include hydrocarbon, (meth) acrylate, itaconate, fumarate, maleate, α-methylene-γ-butyrolactone, styrene, vinyl, maleimide, norbornene and other radical polymerizable groups. A structure having a polymerizable group composed of at least one selected from the group consisting of siloxane and a side chain composed of at least one of the above formulas (21) to (31) is preferable.

Among such liquid crystalline side chain monomers, as a monomer having a carboxyl group or an amide group, a monomer represented by a formula selected from the group consisting of the following formulas M2-1 to M2-9 can also be used.

（式中、ＲはＯＨまたはＮＨ_２を表し、Ｍ１は水素原子又はメチル基を表し、ｓ１はメチレン基の数を表し、２乃至９の自然数である。）

(Wherein, R represents OH or NH _2, M1 represents a hydrogen atom or a methyl group, s1 represents the number of methylene groups is a natural number of 2 to 9.)

（式中、Ｍ１は水素原子又はメチル基を表し、ｓ１はメチレン基の数を表し、２乃至９の自然数である。）Moreover, the monomer represented by the formula chosen from the group which consists of following formula M2-10-M2-16 can also be used as a monomer which has a substituent which expresses liquid crystallinity which is an example of the said other monomer.

(In the formula, M1 represents a hydrogen atom or a methyl group, s1 represents the number of methylene groups, and is a natural number of 2 to 9.)

  (A) The side chain type polymer can be obtained by a copolymerization reaction of the above-described photoreactive side chain monomer exhibiting liquid crystallinity. Further, it can be obtained by copolymerization of a photoreactive side chain monomer that does not exhibit liquid crystallinity and a liquid crystalline side chain monomer, or by copolymerization of a photoreactive side chain monomer that exhibits liquid crystallinity and a liquid crystalline side chain monomer. it can. Furthermore, it can be copolymerized with other monomers as long as the liquid crystallinity is not impaired.

Examples of other monomers include industrially available monomers capable of radical polymerization reaction.
Specific examples of the other monomer include unsaturated carboxylic acid, acrylic ester compound, methacrylic ester compound, maleimide compound, acrylonitrile, maleic anhydride, styrene compound and vinyl compound.

  Specific examples of the unsaturated carboxylic acid include acrylic acid, methacrylic acid, itaconic acid, maleic acid, fumaric acid and the like.

  Examples of the acrylate compound include methyl acrylate, ethyl acrylate, isopropyl acrylate, benzyl acrylate, naphthyl acrylate, anthryl acrylate, anthryl methyl acrylate, phenyl acrylate, 2,2,2-trifluoroethyl acrylate, and tert-butyl. Acrylate, cyclohexyl acrylate, isobornyl acrylate, 2-methoxyethyl acrylate, methoxytriethylene glycol acrylate, 2-ethoxyethyl acrylate, tetrahydrofurfuryl acrylate, 3-methoxybutyl acrylate, 2-methyl-2-adamantyl acrylate, 2- Propyl-2-adamantyl acrylate, 8-methyl-8-tricyclodecyl acrylate, and , Etc. 8-ethyl-8-tricyclodecyl acrylate.

  Examples of the methacrylic acid ester compound include methyl methacrylate, ethyl methacrylate, isopropyl methacrylate, benzyl methacrylate, naphthyl methacrylate, anthryl methacrylate, anthryl methyl methacrylate, phenyl methacrylate, 2,2,2-trifluoroethyl methacrylate, tert-butyl. Methacrylate, cyclohexyl methacrylate, isobornyl methacrylate, 2-methoxyethyl methacrylate, methoxytriethylene glycol methacrylate, 2-ethoxyethyl methacrylate, tetrahydrofurfuryl methacrylate, 3-methoxybutyl methacrylate, 2-methyl-2-adamantyl methacrylate, 2- Propyl-2-adamantyl methacrylate, 8-methyl 8 tricyclodecyl methacrylate, and, 8-ethyl-8-tricyclodecyl methacrylate.

  Examples of the vinyl compound include vinyl ether, methyl vinyl ether, benzyl vinyl ether, 2-hydroxyethyl vinyl ether, phenyl vinyl ether, and propyl vinyl ether.

  Examples of the styrene compound include styrene, methylstyrene, chlorostyrene, bromostyrene, and the like.

  Examples of maleimide compounds include maleimide, N-methylmaleimide, N-phenylmaleimide, and N-cyclohexylmaleimide.

The content of the photoreactive side chain in the side chain polymer of the present invention is preferably 10 mol% to 100 mol%, more preferably 20 mol% to 95 mol%, and more preferably 30 mol% to 30 mol% based on the total amount of the side chain. 90 mol% is more preferable.
When the content of the photoreactive side chain in the side chain polymer is less than 10 mol% based on the total amount of the side chain, the coating film formed from the polymer composition of the present invention has an effect as a liquid crystal alignment film. There is a possibility of not playing enough.

The content of the liquid crystalline side chain in the side chain polymer of the present invention is preferably 90 mol% or less, more preferably 5 mol% to 80 mol%, more preferably 10 mol% to 70 mol% based on the total amount of the side chains. Further preferred.
When the content of liquid crystalline side chains in the side chain polymer is higher than 90 mol% based on the total amount of side chains, the content of photoreactive side chains is less than 10 mol% based on the total amount of side chains, There is a possibility that the coating film formed from the polymer composition of the present invention does not sufficiently exhibit the effect as a liquid crystal alignment film.

  The side chain type polymer of the present invention may contain other side chains other than the photoreactive side chain and the liquid crystalline side chain. The content is the remaining portion when the total content of the photoreactive side chain and the liquid crystalline side chain is less than 100%.

  The method for producing the side chain polymer of the present embodiment is not particularly limited, and a general-purpose method that is handled industrially can be used. Specifically, it can be produced by cationic polymerization, radical polymerization, or anionic polymerization using a vinyl group of a liquid crystalline side chain monomer or photoreactive side chain monomer. Among these, radical polymerization is particularly preferable from the viewpoint of ease of reaction control.

  As the polymerization initiator for radical polymerization, a known compound such as a radical polymerization initiator or a reversible addition-cleavage chain transfer (RAFT) polymerization reagent can be used.

  The radical thermal polymerization initiator is a compound that generates radicals by heating to a decomposition temperature or higher. Examples of such radical thermal polymerization initiators include ketone peroxides (methyl ethyl ketone peroxide, cyclohexanone peroxide, etc.), diacyl peroxides (acetyl peroxide, benzoyl peroxide, etc.), hydroperoxides (peroxidation). Hydrogen, tert-butyl hydride peroxide, cumene hydroperoxide, etc.), dialkyl peroxides (di-tert-butyl peroxide, dicumyl peroxide, dilauroyl peroxide, etc.), peroxyketals (dibutyl peroxy cyclohexane) Etc.), alkyl peresters (peroxyneodecanoic acid-tert-butyl ester, peroxypivalic acid-tert-butyl ester, peroxy 2-ethylcyclohex Acid-tert-amyl ester), persulfates (potassium persulfate, sodium persulfate, ammonium persulfate, etc.), azo compounds (azobisisobutyronitrile, and 2,2′-di (2-hydroxyethyl) And azobisisobutyronitrile). Such radical thermal polymerization initiators can be used singly or in combination of two or more.

  The radical photopolymerization initiator is not particularly limited as long as it is a compound that initiates radical polymerization by light irradiation. Examples of such radical photopolymerization initiators include benzophenone, Michler's ketone, 4,4′-bis (diethylamino) benzophenone, xanthone, thioxanthone, isopropylxanthone, 2,4-diethylthioxanthone, 2-ethylanthraquinone, acetophenone, 2-hydroxy 2-methylpropiophenone, 2-hydroxy-2-methyl-4′-isopropylpropiophenone, 1-hydroxycyclohexyl phenyl ketone, isopropyl benzoin ether, isobutyl benzoin ether, 2,2-diethoxyacetophenone, 2,2 -Dimethoxy-2-phenylacetophenone, camphorquinone, benzanthrone, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropan-1-one, 2- N-di-2-dimethylamino-1- (4-morpholinophenyl) -butanone-1, ethyl 4-dimethylaminobenzoate, isoamyl 4-dimethylaminobenzoate, 4,4′-di (t-butylperoxycarbonyl) benzophenone 3,4,4′-tri (t-butylperoxycarbonyl) benzophenone, 2,4,6-trimethylbenzoyldiphenylphosphine oxide, 2- (4′-methoxystyryl) -4,6-bis (trichloromethyl) -S-triazine, 2- (3 ', 4'-dimethoxystyryl) -4,6-bis (trichloromethyl) -s-triazine, 2- (2', 4'-dimethoxystyryl) -4,6-bis (Trichloromethyl) -s-triazine, 2- (2′-methoxystyryl) -4,6-bis (trichloromethyl) ) -S-triazine, 2- (4'-pentyloxystyryl) -4,6-bis (trichloromethyl) -s-triazine, 4- [pN, N-di (ethoxycarbonylmethyl)]-2, 6-di (trichloromethyl) -s-triazine, 1,3-bis (trichloromethyl) -5- (2′-chlorophenyl) -s-triazine, 1,3-bis (trichloromethyl) -5- (4 ′ -Methoxyphenyl) -s-triazine, 2- (p-dimethylaminostyryl) benzoxazole, 2- (p-dimethylaminostyryl) benzthiazole, 2-mercaptobenzothiazole, 3,3′-carbonylbis (7-diethylamino) Coumarin), 2- (o-chlorophenyl) -4,4 ′, 5,5′-tetraphenyl-1,2′-biimidazole, 2,2′-bi (2-chlorophenyl) -4,4 ′, 5,5′-tetrakis (4-ethoxycarbonylphenyl) -1,2′-biimidazole, 2,2′-bis (2,4-dichlorophenyl) -4, 4 ′, 5,5′-tetraphenyl-1,2′-biimidazole, 2,2′bis (2,4-dibromophenyl) -4,4 ′, 5,5′-tetraphenyl-1,2 ′ -Biimidazole, 2,2'-bis (2,4,6-trichlorophenyl) -4,4 ', 5,5'-tetraphenyl-1,2'-biimidazole, 3- (2-methyl-2 -Dimethylaminopropionyl) carbazole, 3,6-bis (2-methyl-2-morpholinopropionyl) -9-n-dodecylcarbazole, 1-hydroxycyclohexyl phenyl ketone, bis (5-2,4-cyclopentadi) N-1-yl) -bis (2,6-difluoro-3- (1H-pyrrol-1-yl) -phenyl) titanium, 3,3 ′, 4,4′-tetra (t-butylperoxycarbonyl) benzophenone 3,3 ′, 4,4′-tetra (t-hexylperoxycarbonyl) benzophenone, 3,3′-di (methoxycarbonyl) -4,4′-di (t-butylperoxycarbonyl) benzophenone, 3,4 '-Di (methoxycarbonyl) -4,3'-di (t-butylperoxycarbonyl) benzophenone, 4,4'-di (methoxycarbonyl) -3,3'-di (t-butylperoxycarbonyl) benzophenone, 2, -(3-methyl-3H-benzothiazol-2-ylidene) -1-naphthalen-2-yl-ethanone or 2- (3-methyl-1 3- benzothiazol -2 (3H) - ylidene) -1- (2-benzoyl) ethanone, and the like. These compounds may be used alone or in combination of two or more.

  The radical polymerization method is not particularly limited, and an emulsion polymerization method, suspension polymerization method, dispersion polymerization method, precipitation polymerization method, bulk polymerization method, solution polymerization method and the like can be used.

  The organic solvent used for the polymerization reaction of the photosensitive side chain polymer capable of exhibiting liquid crystallinity is not particularly limited as long as the generated polymer is soluble. Specific examples are given below.

  N, N-dimethylformamide, N, N-dimethylacetamide, N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone, N-methylcaprolactam, dimethyl sulfoxide, tetramethyl urea, pyridine, dimethyl sulfone, hexamethyl sulfoxide , Γ-butyrolactone, isopropyl alcohol, methoxymethylpentanol, dipentene, ethyl amyl ketone, methyl nonyl ketone, methyl ethyl ketone, methyl isoamyl ketone, methyl isopropyl ketone, methyl cellosolve, ethyl cellosolve, methyl cellosolve acetate, ethyl cellosolve acetate, butyl Carbitol, ethyl carbitol, ethylene glycol, ethylene glycol monoacetate, ethylene glycol monoisopropyl ether, ethyl 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 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, 3-methyl-3-methoxybutanol, diisopropyl ether, ethyl isobutyl ether, diisobutylene, amyl acetate, butyl butyrate, butyl ether, diisobutyl ketone, methylcyclohexene, propyl ether, dihexyl ether, dioxane, n- Hexane, n-pentane, n-octane, diethyl ether, cyclohexanone, ethylene carbonate, propylene carbonate, methyl lactate, ethyl lactate, methyl acetate, ethyl acetate, n-butyl acetate, propylene glycol monoethyl ether, methyl pyruvate, Ethyl pyruvate, methyl 3-methoxypropionate, methyl ethyl 3-ethoxypropionate, ethyl 3-methoxypropionate, 3-ethoxypropion , 3-methoxypropionic acid, propyl 3-methoxypropionate, butyl 3-methoxypropionate, diglyme, 4-hydroxy-4-methyl-2-pentanone, 3-methoxy-N, N-dimethylpropanamide, 3-ethoxy -N, N-dimethylpropanamide, 3-butoxy-N, N-dimethylpropanamide and the like can be mentioned.

These organic solvents may be used alone or in combination. Furthermore, even if it is a solvent which does not dissolve the polymer | macromolecule to produce | generate, you may mix and use the above-mentioned organic solvent in the range which the polymer | macromolecule produced | generated does not precipitate.
In radical polymerization, oxygen in the organic solvent becomes a cause of inhibiting the polymerization reaction. Therefore, it is preferable to use an organic solvent that has been deaerated to the extent possible.

  The polymerization temperature during radical polymerization can be selected from 30 ° C. to 150 ° C., but is preferably in the range of 50 ° C. to 100 ° C. The reaction can be carried out at any concentration, but if the concentration is too low, it is difficult to obtain a high molecular weight polymer, and if the concentration is too high, the viscosity of the reaction solution becomes too high and uniform stirring is difficult. Therefore, the monomer concentration is preferably 1% by mass to 50% by mass, more preferably 5% by mass to 30% by mass. The initial stage of the reaction is carried out at a high concentration, and then an organic solvent can be added.

  In the above-mentioned radical polymerization reaction, the molecular weight of the obtained polymer is decreased when the ratio of the radical polymerization initiator is large relative to the monomer, and the molecular weight of the obtained polymer is increased when the ratio is small, the ratio of the radical initiator is It is preferable that it is 0.1 mol%-10 mol% with respect to the monomer to superpose | polymerize. Further, various monomer components, solvents, initiators and the like can be added during the polymerization.

[Recovery of polymer]
When recovering the produced polymer from the reaction solution of the photosensitive side chain polymer capable of exhibiting liquid crystallinity obtained by the above reaction, the reaction solution is put into a poor solvent, What is necessary is just to precipitate a coalescence. Examples of the poor solvent used for precipitation include methanol, acetone, hexane, heptane, butyl cellosolve, heptane, methyl ethyl ketone, methyl isobutyl ketone, ethanol, toluene, benzene, diethyl ether, methyl ethyl ether, and water. The polymer deposited in a poor solvent and precipitated can be recovered by filtration and then dried at normal temperature or under reduced pressure at room temperature or by heating. Moreover, when the polymer which carried out precipitation collection | recovery is re-dissolved in an organic solvent and the operation which carries out reprecipitation collection | recovery is repeated 2 to 10 times, the impurity in a polymer can be decreased. Examples of the poor solvent at this time include alcohols, ketones, hydrocarbons and the like, and it is preferable to use three or more kinds of poor solvents selected from these because purification efficiency is further improved.

  The molecular weight of the (A) side chain polymer of the present invention is measured by a GPC (Gel Permeation Chromatography) method in consideration of the strength of the resulting coating film, workability during coating film formation, and coating film uniformity. The weight average molecular weight is preferably from 2,000 to 1,000,000, more preferably from 5,000 to 100,000.

<(B) Dichroic dye>
A dichroic dye refers to a dye having the property that the absorbance in the major axis direction of a molecule is different from the absorbance in the minor axis direction.

  The dichroic dye preferably has an absorption maximum wavelength (λMAX) in the range of 300 to 700 nm. Examples of such dichroic dyes include acridine dyes, oxazine dyes, cyanine dyes, naphthalene dyes, azo dyes and anthraquinone dyes, and among them, azo dyes are preferable. Examples of the azo dye include monoazo dyes, bisazo dyes, trisazo dyes, tetrakisazo dyes, and stilbene azo dyes, and bisazo dyes and trisazo dyes are preferable.

Examples of the azo dye include a compound represented by the formula (b) (hereinafter sometimes referred to as “compound (b)”).
_{^{A 1 (-N = N-A}} 2) p -N = N-A 3 (b)
[In the formula (b),
A ¹ and A ³ are each independently a phenyl group which may have a substituent, a naphthyl group which may have a substituent, or a monovalent heterocyclic group which may have a substituent. Represents. A ² is a 1,4-phenylene group which may have a substituent, a naphthalene-1,4-diyl group which may have a substituent, or a divalent which may have a substituent. Represents a heterocyclic group. p represents an integer of 1 to 4. When p is an integer greater than or equal to ² , several A2 may mutually be same or different independently. ]

  Examples of the monovalent heterocyclic group include groups in which one hydrogen atom has been removed from a heterocyclic compound such as quinoline, thiazole, benzothiazole, thienothiazole, imidazole, benzimidazole, oxazole and benzoxazole. Examples of the divalent heterocyclic group include groups in which two hydrogen atoms have been removed from the heterocyclic compound.

As a substituent which the phenyl group, naphthyl group and monovalent heterocyclic group in A ¹ and A ³ and the p-phenylene group, naphthalene-1,4-diyl group and divalent heterocyclic group in A ² optionally have Is an alkyl group having 1 to 4 carbon atoms; an alkoxy group having 1 to 4 carbon atoms such as a methoxy group, an ethoxy group and a butoxy group; a fluorinated alkyl group having 1 to 4 carbon atoms such as a trifluoromethyl group; A cyano group; a nitro group; a halogen atom; a substituted or unsubstituted amino group such as an amino group, a diethylamino group, and a pyrrolidino group (a substituted amino group is an amino group having one or two alkyl groups having 1 to 6 carbon atoms); Or an amino group in which two substituted alkyl groups are bonded to each other to form an alkanediyl group having 2 to 8 carbon atoms, the unsubstituted amino group is —NH _2. ).

The alkyl group having 1 to 6 carbon atoms may be linear or branched, and may be a methyl group, ethyl group, n-propyl group, i-propyl group, n-butyl group, or s-butyl. Group, t-butyl group, n-pentyl group, 1-methylbutyl group, 2-methylbutyl group, 3-methylbutyl group, 1,1-dimethylpropyl group, 2,2-dimethylpropyl group, n-hexyl group, 1- Examples thereof include a methylpentyl group, 2-methylpentyl group, 1,1-dimethylbutyl group, 1-ethylbutyl group, 1,1,2-trimethylpropyl group.

  Of the compounds (b), compounds represented by the following formulas (2-1) to (2-6) are preferable.

［式（２−１）〜（２−６）中、
Ｂ^１〜Ｂ^２０は、互いに独立に、水素原子、炭素原子数１〜６のアルキル基、炭素原子数１〜４のアルコキシ基、シアノ基、ニトロ基、置換又は無置換のアミノ基（置換アミノ基及び無置換アミノ基の定義は前記のとおり）、塩素原子又はトリフルオロメチル基を表す。
ｎ１〜ｎ４は、互いに独立に０〜３の整数を表す。
ｎ１が２以上である場合、複数のＢ^２は互いに独立して同一でも異なっていてもよく、
ｎ２が２以上である場合、複数のＢ^６は互いに独立して同一でも異なっていてもよく、
ｎ３が２以上である場合、複数のＢ^９は互いに独立して同一でも異なっていてもよく、
ｎ４が２以上である場合、複数のＢ^１４は互いに独立して同一でも異なっていてもよい。］

[In the formulas (2-1) to (2-6),
B ^{1 to} B ²⁰ each independently represent a hydrogen atom, an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 4 carbon atoms, a cyano group, a nitro group, a substituted or unsubstituted amino group (substituted amino group). Group and unsubstituted amino group are as defined above), and represents a chlorine atom or a trifluoromethyl group.
n1 to n4 each independently represents an integer of 0 to 3.
when n1 is 2 or more, the plurality of B ² may be the same or different independently of each other;
when n2 is 2 or more, the plurality of B ⁶ may be the same or different independently of each other;
when n3 is 2 or more, the plurality of B ⁹ may be the same or different independently of each other;
When n4 is 2 or more, the plurality of B ¹⁴ may be the same or different independently of each other. ]

［式（２−７）中、
Ｒ^１〜Ｒ^８は、互いに独立に、水素原子、−Ｒ^ｘ、−ＮＨ_２、−ＮＨＲ^ｘ、−ＮＲ^ｘ _２、−ＳＲ^ｘ又はハロゲン原子を表す。
Ｒ^ｘは、炭素原子数１〜６のアルキル基又は炭素原子数６〜１２のアリール基を表す。］The anthraquinone dye is preferably a compound represented by the formula (2-7).

[In the formula (2-7),
R ^{1 to} R ⁸ each independently represent a hydrogen atom, —R ^x , —NH ₂ , —NHR ^x , —NR ^x ₂ , —SR ^x, or a halogen atom.
R ^x represents an alkyl group having 1 to 6 carbon atoms or an aryl group having 6 to 12 carbon atoms. ]

［式（２−８）中、
Ｒ^９〜Ｒ^１５は、互いに独立に、水素原子、−Ｒ^ｘ、−ＮＨ_２、−ＮＨＲ^ｘ、−ＮＲ^ｘ _２、−ＳＲ^ｘ又はハロゲン原子を表す。
Ｒ^ｘは、炭素原子数１〜６のアルキル基又は炭素原子数６〜１２のアリール基を表す。］The oxazone dye is preferably a compound represented by the formula (2-8).

[In the formula (2-8),
R ^{9 to} R ¹⁵ each independently represent a hydrogen atom, —R ^x , —NH ₂ , —NHR ^x , —NR ^x ₂ , —SR ^x, or a halogen atom.
R ^x represents an alkyl group having 1 to 6 carbon atoms or an aryl group having 6 to 12 carbon atoms. ]

［式（２−９）中、
Ｒ^１６〜Ｒ^２３は、互いに独立に、水素原子、−Ｒ^ｘ、−ＮＨ_２、−ＮＨＲ^ｘ、−ＮＲ^ｘ _２、−ＳＲ^ｘ又はハロゲン原子を表す。
Ｒ^ｘは、炭素原子数１〜６のアルキル基又は炭素原子数６〜１２のアリール基を表す。］The acridine dye is preferably a compound represented by the formula (2-9).

[In Formula (2-9),
R ¹⁶ to R ²³ independently represent a hydrogen _{^{atom, -R x, -NH 2, -NHR}} x, -NR x 2, -SR x , or halogen atom.
R ^x represents an alkyl group having 1 to 6 carbon atoms or an aryl group having 6 to 12 carbon atoms. ]

In the formula (2-7), formula (2-8) and formula (2-9), examples of the alkyl group having 1 to 6 carbon atoms representing R ^x include a methyl group, an ethyl group, a propyl group, a butyl group, Examples thereof include a pentyl group and a hexyl group. Examples of the aryl group having 6 to 12 carbon atoms include a phenyl group, a toluyl group, a xylyl group, and a naphthyl group.

［式（２−１０）中、
Ｄ^１及びＤ^２は、互いに独立に、式（２−１０ａ）〜式（２−１０ｄ）のいずれかで表される基を表す。

ｎ５は１〜３の整数を表す。］The cyanine dye is preferably a compound represented by formula (2-10) and a compound represented by formula (2-11).

[In the formula (2-10),
D ¹ and D ² each independently represent a group represented by any one of formulas (2-10a) to (2-10d).

n5 represents an integer of 1 to 3. ]

［式（２−１１）中、
Ｄ^３及びＤ^４は、互いに独立に、式（２−１１ａ）〜式（２−１１ｈ）のいずれかで表される基を表す。

ｎ６は１〜３の整数を表す。］

[In the formula (2-11),
D ³ and D ⁴ each independently represent a group represented by any one of formulas (2-11a) to (2-11h).

n6 represents an integer of 1 to 3. ]

  Moreover, as a commercial item of the above-mentioned dichroic dye, G-207, G-241, G-470 (made by Hayashibara), Yellow-8, KRD-901, KRD-902 (Showa Chemical Industry), for example And SI-486 (Mitsui Chemicals).

  The content of the dichroic dye as the component (B) in the alignment layer forming composition is 100 parts by mass of the side chain polymer as the component (A) from the viewpoint of improving the orientation of the dichroic dye. On the other hand, 0.1 to 30 parts by mass is preferable, 0.1 to 20 parts by mass is more preferable, and 0.1 to 10 parts by mass is further preferable.

（式中、Ｒ^１０１、Ｒ^１０２、Ｒ^１０３、Ｒ^１０４及びＲ^１０５のうちいずれか３つ乃至５つは、それぞれ独立に水素原子、ハロゲン原子、Ｃ_１〜Ｃ_６アルキル、Ｃ_１〜Ｃ_６ハロアルキル、Ｃ_１〜Ｃ_６アルコキシ、Ｃ_１〜Ｃ_６ハロアルコキシ、Ｃ_３〜Ｃ_８シクロアルキル、Ｃ_３〜Ｃ_８ハロシクロアルキル、Ｃ_２〜Ｃ_６アルケニル、Ｃ_２〜Ｃ_６ハロアルケニル、Ｃ_３〜Ｃ_８シクロアルケニル、Ｃ_３〜Ｃ_８ハロシクロアルケニル、Ｃ_２〜Ｃ_６アルキニル、Ｃ_２〜Ｃ_６ハロアルキニル、（Ｃ_１〜Ｃ_６アルキル）カルボニル、（Ｃ_１〜Ｃ_６ハロアルキル）カルボニル、（Ｃ_１〜Ｃ_６アルコキシ）カルボニル、（Ｃ_１〜Ｃ_６ハロアルコキシ）カルボニル、（Ｃ_１〜Ｃ_６アルキルアミノ）カルボニル、（Ｃ_１〜Ｃ_６ハロアルキル）アミノカルボニル、ジ（Ｃ_１〜Ｃ_６アルキル）アミノカルボニル、シアノ及びニトロからなる群から選ばれる置換基を表し、Ｒ^１０１、Ｒ^１０２、Ｒ^１０３、Ｒ^１０４及びＲ^１０５のうちいずれか３つ乃至４つが上記の定義である場合、Ｒ^１０１、Ｒ^１０２、Ｒ^１０３、Ｒ^１０４及びＲ^１０５のうちの残り１つ又は２つは下記式（ｃ−２）

（式（ｃ−２）中、破線は結合手を表し、Ｒ¹⁰⁶は炭素原子数１〜３０のアルキレン基、フェニレンまたは二価の炭素環若しくは複素環を表し、このアルキレン基、フェニレンまたは二価の炭素環若しくは複素環中の１つ若しくは複数の水素原子は、フッ素原子又は有機基で置き換えられていてもよい。また、Ｒ¹⁰⁶中の−ＣＨ_２ＣＨ_２−が−ＣＨ＝ＣＨ−に置き換えられていてもよく、Ｒ¹⁰⁶中の−ＣＨ_２−は、フェニレンまたは二価の炭素環若しくは複素環に置き換えられていてもよく、さらに、次に挙げるいずれかの基が互いに隣り合わない場合において、これらの基に置き換えられていてもよい；−Ｏ−、−ＮＨＣＯ−、−ＣＯＮＨ−、−ＣＯＯ−、−ＯＣＯ−、−ＮＨ−、−ＮＨＣＯＮＨ−、−ＣＯ−。Ｒ¹⁰⁷は水素原子又はメチル基を表す。）で表される基を表し、ｎは０または１を表す。）<(C) component>
The polymer composition of this invention can also contain the compound represented by a following formula (c) as (C) component.

(In the formula, any three to five of R ¹⁰¹ , R ¹⁰² , R ¹⁰³ , R ¹⁰⁴ and R ¹⁰⁵ are each independently a hydrogen atom, a halogen atom, C ₁ -C ₆ alkyl, C ₁ -C _6. Haloalkyl, C ₁ -C ₆ alkoxy, C ₁ -C ₆ haloalkoxy, C ₃ -C ₈ cycloalkyl, C ₃ -C ₈ halocycloalkyl, C ₂ -C ₆ alkenyl, C ₂ -C ₆ haloalkenyl, C ₃ -C _{8 cycloalkenyl,} C 3 -C ₈ halocycloalkyl _{cycloalkenyl,} C 2 -C _{6 alkynyl,} C 2 -C _{6 haloalkynyl, (C} 1 ~C ₆ alkyl) _{carbonyl, (C} 1 ~C ₆ haloalkyl) carbonyl , (C ₁ -C ₆ alkoxy) carbonyl, (C ₁ -C ₆ haloalkoxy) carbonyl, (C ₁ -C ₆ alkylamino) carbonyl, (C _1- C ₆ haloalkyl) aminocarbonyl, di (C ₁ -C ₆ alkyl) aminocarbonyl, a substituent selected from the group consisting of cyano and nitro, and any of R ¹⁰¹ , R ¹⁰² , R ¹⁰³ , R ¹⁰⁴ and R ¹⁰⁵ When three to four are defined as above, one or two of R ¹⁰¹ , R ¹⁰² , R ¹⁰³ , R ¹⁰⁴ and R ¹⁰⁵ are represented by the following formula (c-2):

(In the formula (c-2), a broken line represents a bond, and R ¹⁰⁶ represents an alkylene group having 1 to 30 carbon atoms, phenylene, a divalent carbocycle or a heterocycle, and the alkylene group, phenylene or divalent One or a plurality of hydrogen atoms in the carbocycle or heterocycle may be replaced with a fluorine atom or an organic group, and —CH ₂ CH ₂ — in R ¹⁰⁶ is replaced with —CH═CH—. And —CH ₂ — in R ¹⁰⁶ may be replaced by phenylene or a divalent carbocyclic or heterocyclic ring, and when any of the following groups is not adjacent to each other: And these groups may be substituted: —O—, —NHCO—, —CONH—, —COO—, —OCO—, —NH—, —NHCONH—, —CO—, wherein R ¹⁰⁷ is a hydrogen atom or Methyl Represents a group, and n represents 0 or 1. )

  Examples of the halogen atom in the present specification include a fluorine atom, a chlorine atom, a bromine atom and an iodine atom. In the present specification, the notation “halo” also represents these halogen atoms.

The notation of C _a -C _b alkyl in the present specification represents a linear or branched hydrocarbon group having a carbon number of _a to _b , for example, methyl group, ethyl group, n-propyl group, i-propyl group, n-butyl group, i-butyl group, s-butyl group, t-butyl group, n-pentyl group, 1-methylbutyl group, 2-methylbutyl group, 3-methylbutyl group, 1-ethylpropyl group 1,1-dimethylpropyl group, 1,2-dimethylpropyl group, 2,2-dimethylpropyl group, n-hexyl group, 1-methylpentyl group, 2-methylpentyl group, 1,1-dimethylbutyl group, Specific examples include 1,3-dimethylbutyl group, heptyl group, octyl group, nonyl group, decyl group, undecyl group, dodecyl group, etc., and each is selected within the range of the designated number of carbon atoms.

In the present specification, C _a -C _b haloalkyl is represented by a linear or branched chain having _a to _b carbon atoms in which a hydrogen atom bonded to a carbon atom is optionally substituted with a halogen atom. Represents a hydrocarbon group, and when substituted by two or more halogen atoms, the halogen atoms may be the same as or different from each other. For example, fluoromethyl group, chloromethyl group, bromomethyl group, iodomethyl group, difluoromethyl group, chlorofluoromethyl group, dichloromethyl group, bromofluoromethyl group, trifluoromethyl group, chlorodifluoromethyl group, dichlorofluoromethyl group, trichloromethyl Group, bromodifluoromethyl group, bromochlorofluoromethyl group, dibromofluoromethyl group, 2-fluoroethyl group, 2-chloroethyl group, 2-bromoethyl group, 2,2-difluoroethyl group, 2-chloro-2-fluoroethyl Group, 2,2-dichloroethyl group, 2-bromo-2-fluoroethyl group, 2,2,2-trifluoroethyl group, 2-chloro-2,2-difluoroethyl group, 2,2-dichloro-2 -Fluoroethyl group, 2,2,2-trichloroethyl group, 2 Bromo-2,2-difluoroethyl group, 2-bromo-2-chloro-2-fluoroethyl group, 2-bromo-2,2-dichloroethyl group, 1,1,2,2-tetrafluoroethyl group, penta Fluoroethyl group, 1-chloro-1,2,2,2-tetrafluoroethyl group, 2-chloro-1,1,2,2-tetrafluoroethyl group, 1,2-dichloro-1,2,2- Trifluoroethyl group, 2-bromo-1,1,2,2-tetrafluoroethyl group, 2-fluoropropyl group, 2-chloropropyl group, 2-bromopropyl group, 2-chloro-2-fluoropropyl group, 2,3-dichloropropyl group, 2-bromo-3-fluoropropyl group, 3-bromo-2-chloropropyl group, 2,3-dibromopropyl group, 3,3,3-trifluoropropyl group, 3-butyl Mo-3,3-difluoropropyl group, 2,2,3,3-tetrafluoropropyl group, 2-chloro-3,3,3-trifluoropropyl group, 2,2,3,3,3-pentafluoro Propyl group, 1,1,2,3,3,3-hexafluoropropyl group, heptafluoropropyl group, 2,3-dichloro-1,1,2,3,3-pentafluoropropyl group, 2-fluoro- 1-methylethyl group, 2-chloro-1-methylethyl group, 2-bromo-1-methylethyl group, 2,2,2-trifluoro-1- (trifluoromethyl) ethyl group, 1,2,2 , 2-tetrafluoro-1- (trifluoromethyl) ethyl group, 2,2,3,3,4,4-hexafluorobutyl group, 2,2,3,4,4,4-hexafluorobutyl group, 2,2,3,3,4,4,4-hep Tafluorobutyl group, 1,1,2,2,3,3,4,4-octafluorobutyl group, nonafluorobutyl group, 4-chloro-1,1,2,2,3,3,4,4 -Octafluorobutyl group, 2-fluoro-2-methylpropyl group, 2-chloro-1,1-dimethylethyl group, 2-bromo-1,1-dimethylethyl group, 5-chloro-2,2,3, Specific examples include a 4,4,5,5-heptafluoropentyl group, a tridecafluorohexyl group, and the like, and each is selected within the range of the designated number of carbon atoms.

In the present specification, C _a -C _b cycloalkyl represents a cyclic hydrocarbon group having a carbon number of _a to _b , and forms a monocyclic or complex ring structure having 3 to 6 members. I can do it. Each ring may be optionally substituted with an alkyl group within the range of the specified number of carbon atoms. For example, cyclopropyl group, 1-methylcyclopropyl group, 2-methylcyclopropyl group, 2,2-dimethylcyclopropyl group, 2,2,3,3-tetramethylcyclopropyl group, cyclobutyl group, cyclopentyl group, 2- Specific examples include methylcyclopentyl group, 3-methylcyclopentyl group, cyclohexyl group, 2-methylcyclohexyl group, 3-methylcyclohexyl group, 4-methylcyclohexyl group, bicyclo [2.2.1] heptan-2-yl group, and the like. Each of which is selected for each specified number of carbon atoms.

In the present specification, C _a -C _b halocycloalkyl is a cyclic hydrocarbon group having a carbon number of _a to _b in which a hydrogen atom bonded to a carbon atom is optionally substituted with a halogen atom. And can form monocyclic or complex ring structures from 3 to 6-membered rings. Each ring may be optionally substituted with an alkyl group within the range of the specified number of carbon atoms, and the substitution with a halogen atom may be a ring structure part, a side chain part, They may be both, and when they are substituted by two or more halogen atoms, the halogen atoms may be the same as or different from each other. For example, 2,2-difluorocyclopropyl group, 2,2-dichlorocyclopropyl group, 2,2-dibromocyclopropyl group, 2,2-difluoro-1-methylcyclopropyl group, 2,2-dichloro-1-methyl Cyclopropyl group, 2,2-dibromo-1-methylcyclopropyl group, 2,2,3,3-tetrafluorocyclobutyl group, 2- (trifluoromethyl) cyclohexyl group, 3- (trifluoromethyl) cyclohexyl group , 4- (trifluoromethyl) cyclohexyl group and the like can be mentioned as specific examples, and each is selected within the range of the designated number of carbon atoms.

In the present specification, C _a -C _b alkenyl is a linear or branched chain composed of _a to _b carbon atoms and has one or more double bonds in the molecule. Represents a saturated hydrocarbon group, for example, vinyl group, 1-propenyl group, 2-propenyl group, 1-methylethenyl group, 2-butenyl group, 1-methyl-2-propenyl group, 2-methyl-2-propenyl group, 2 -Pentenyl group, 2-methyl-2-butenyl group, 3-methyl-2-butenyl group, 2-ethyl-2-propenyl group, 1,1-dimethyl-2-propenyl group, 2-hexenyl group, 2-methyl Specific examples include 2-pentenyl group, 2,4-dimethyl-2,6-heptadienyl group, 3,7-dimethyl-2,6-octadienyl group, and the like, each selected within the range of the specified number of carbon atoms. Is done.

In the present specification, C _a -C _b haloalkenyl is a linear or branched chain in which a hydrogen atom bonded to a carbon atom is optionally substituted with a halogen atom, and the number of carbon atoms is ab. And an unsaturated hydrocarbon group having one or more double bonds in the molecule. At this time, when substituted with two or more halogen atoms, the halogen atoms may be the same as or different from each other. For example, 2,2-dichlorovinyl group, 2-fluoro-2-propenyl group, 2-chloro-2-propenyl group, 3-chloro-2-propenyl group, 2-bromo-2-propenyl group, 3-bromo-2 -Propenyl group, 3,3-difluoro-2-propenyl group, 2,3-dichloro-2-propenyl group, 3,3-dichloro-2-propenyl group, 2,3-dibromo-2-propenyl group, 2, 3,3-trifluoro-2-propenyl group, 2,3,3-trichloro-2-propenyl group, 1- (trifluoromethyl) ethenyl group, 3-chloro-2-butenyl group, 3-bromo-2- Butenyl group, 4,4-difluoro-3-butenyl group, 3,4,4-trifluoro-3-butenyl group, 3-chloro-4,4,4-trifluoro-2-butenyl group, 3-bromo- 2-methyl- - propenyl group, etc. As a specific example, it may be selected from the range of the specified number of carbon atoms.

The notation of C _a -C _b cycloalkenyl in the present specification represents a cyclic unsaturated hydrocarbon group having 1 to 2 carbon atoms and having 1 or 2 or more double bonds. A monocyclic or complex ring structure from a member ring to a 6-member ring can be formed. Each ring may be optionally substituted with an alkyl group within the range of the specified number of carbon atoms, and the double bond may be either endo- or exo-. For example, 2-cyclopenten-1-yl group, 3-cyclopenten-1-yl group, 2-cyclohexen-1-yl group, 3-cyclohexen-1-yl group, bicyclo [2.2.1] -5-heptene- A 2-yl group or the like is given as a specific example, and is selected within the range of each designated number of carbon atoms.

In the present specification, C _a -C _b halocycloalkenyl is represented by a cyclic and one carbon atom having _a to _b carbon atoms in which a hydrogen atom bonded to a carbon atom is optionally substituted with a halogen atom. Alternatively, it represents an unsaturated hydrocarbon group having two or more double bonds, and can form a monocyclic or complex ring structure having 3 to 6 members. Each ring may be optionally substituted with an alkyl group within the range of the specified number of carbon atoms, and the double bond may be either endo- or exo-. In addition, the substitution by a halogen atom may be a ring structure part, a side chain part or both of them, and when substituted by two or more halogen atoms, those halogen atoms May be the same as or different from each other. For example, a 2-chlorobicyclo [2.2.1] -5-hepten-2-yl group and the like are given as specific examples, and each group is selected within the range of the designated number of carbon atoms.

In the present specification, C _a -C _b alkynyl is a linear or branched chain composed of _a to _b carbon atoms and has one or more triple bonds in the molecule. Represents a hydrocarbon group, for example, ethynyl group, 1-propynyl group, 2-propynyl group, 2-butynyl group, 1-methyl-2-propynyl group, 2-pentynyl group, 1-methyl-2-butynyl group, 1, Specific examples include a 1-dimethyl-2-propynyl group, a 2-hexynyl group, and the like, and each is selected within the range of the designated number of carbon atoms.

In the present specification, C _a -C _b haloalkynyl represents a linear or branched chain in which a hydrogen atom bonded to a carbon atom is optionally substituted with a halogen atom, and the number of carbon atoms is a to b. And an unsaturated hydrocarbon group having one or more triple bonds in the molecule. At this time, when substituted with two or more halogen atoms, the halogen atoms may be the same as or different from each other. Specific examples include 2-chloroethynyl group, 2-bromoethynyl group, 2-iodoethynyl group, 3-chloro-2-propynyl group, 3-bromo-2-propynyl group, 3-iodo-2-propynyl group and the like. Each of which is selected for each specified number of carbon atoms.

The notation of C _a -C _b alkoxy in the present specification represents an alkyl-O— group having the above-mentioned meaning consisting of _a to _b carbon atoms, for example, methoxy group, ethoxy group, n-propyloxy group, Specific examples include i-propyloxy group, n-butyloxy group, i-butyloxy group, s-butyloxy group, t-butyloxy group, n-pentyloxy group, n-hexyloxy group and the like. It is selected in the range of the number of atoms.

The notation of C _a -C _b haloalkoxy in the present specification represents a haloalkyl-O— group having the above-mentioned meaning consisting of _a to _b carbon atoms, for example, difluoromethoxy group, trifluoromethoxy group, chlorodifluoro Methoxy group, bromodifluoromethoxy group, 2-fluoroethoxy group, 2-chloroethoxy group, 2,2,2-trifluoroethoxy group, 1,1,2,2, -tetrafluoroethoxy group, 2-chloro-1 , 1,2-trifluoroethoxy group, 2-bromo-1,1,2-trifluoroethoxy group, pentafluoroethoxy group, 2,2-dichloro-1,1,2-trifluoroethoxy group, 2,2 , 2-trichloro-1,1-difluoroethoxy group, 2-bromo-1,1,2,2-tetrafluoroethoxy group, 2,2,3,3-tetrafluoro Olopropyloxy group, 1,1,2,3,3,3-hexafluoropropyloxy group, 2,2,2-trifluoro-1- (trifluoromethyl) ethoxy group, heptafluoropropyloxy group, 2- Specific examples include a bromo-1,1,2,3,3,3-hexafluoropropyloxy group and the like, which are selected in the range of the respective designated number of carbon atoms.

The notation of (C _a -C _b alkyl) carbonyl in the present specification represents an alkyl-C (O) -group having the above-mentioned meaning consisting of _a to _b carbon atoms, for example, acetyl group, propionyl group, Specific examples include butyryl group, isobutyryl group, valeryl group, isovaleryl group, 2-methylbutanoyl group, pivaloyl group, hexanoyl group, heptanoyl group and the like, and each is selected in the range of the designated number of carbon atoms.

The notation of (C _a -C _b haloalkyl) carbonyl in the present specification represents a haloalkyl-C (O) -group having the above-mentioned meaning consisting of _a to _b carbon atoms, for example, fluoroacetyl group, chloroacetyl group Group, difluoroacetyl group, dichloroacetyl group, trifluoroacetyl group, chlorodifluoroacetyl group, bromodifluoroacetyl group, trichloroacetyl group, pentafluoropropionyl group, heptafluorobutanoyl group, 3-chloro-2,2-dimethylprop Specific examples include a noyl group and the like, and each is selected within the range of the designated number of carbon atoms.

The notation of (C _a -C _b alkoxy) carbonyl in the present specification represents an alkyl-O—C (O) — group having the above-mentioned meaning consisting of _a to _b carbon atoms, such as a methoxycarbonyl group, Specific examples include ethoxycarbonyl group, n-propyloxycarbonyl group, i-propyloxycarbonyl group, n-butoxycarbonyl group, i-butoxycarbonyl group, t-butoxycarbonyl group and the like. The range is selected.

In the present specification, the expression (C _a -C _b haloalkoxy) carbonyl represents a haloalkyl-O—C (O) — group having the above-mentioned meaning consisting of _a to _b carbon atoms, for example 2-chloro Specific examples include ethoxycarbonyl group, 2,2-difluoroethoxycarbonyl group, 2,2,2-trifluoroethoxycarbonyl group, 2,2,2-trichloroethoxycarbonyl group, etc. The range is selected.

The notation of (C _a -C _b alkylamino) carbonyl in the present specification represents a carbamoyl group in which one of the hydrogen atoms is substituted with an alkyl group having the above-mentioned meaning consisting of _a to _b carbon atoms, for example Specific examples include methylcarbamoyl group, ethylcarbamoyl group, n-propylcarbamoyl group, i-propylcarbamoyl group, n-butylcarbamoyl group, i-butylcarbamoyl group, s-butylcarbamoyl group, t-butylcarbamoyl group and the like. , Each selected range of carbon atoms.

The notation of (C _a -C _b haloalkyl) aminocarbonyl in the present specification represents a carbamoyl group substituted with a haloalkyl group as defined above, wherein one of the hydrogen atoms is composed of _a to _b carbon atoms. Specific examples include -fluoroethylcarbamoyl group, 2-chloroethylcarbamoyl group, 2,2-difluoroethylcarbamoyl group, 2,2,2-trifluoroethylcarbamoyl group, etc. Selected.

In the present specification, the notation of di (C _a -C _b alkyl) aminocarbonyl means in the above meaning that the number of carbon atoms which may be the same or different from each other is _a to _b. Represents a carbamoyl group substituted by an alkyl group, for example, N, N-dimethylcarbamoyl group, N-ethyl-N-methylcarbamoyl group, N, N-diethylcarbamoyl group, N, N-di-n-propylcarbamoyl group N, N-di-n-butylcarbamoyl group and the like are given as specific examples, and each is selected within the range of the designated number of carbon atoms.

Substituents ^R 101 in cinnamic acid or benzoic acid derivative having a structure represented by the formula ^(c), as the ^{R 102,} R ^103, R ¹⁰⁴ and ^{R 105,} among others, each independently represent a hydrogen atom, a halogen _{atom, C} 1 ~ A substituent selected from the group consisting of C ₆ alkyl, C ₁ -C ₆ haloalkyl, C ₁ -C ₆ alkoxy, C ₁ -C ₆ haloalkoxy, cyano and nitro is preferred.

R ¹⁰³ is preferably a substituent other than a hydrogen atom in the definitions of R ¹⁰¹ , R ¹⁰² , R ¹⁰³ , R ¹⁰⁴ and R ¹⁰⁵ described above, from the viewpoint of orientation sensitivity, and preferably a halogen atom, C ₁ Substituents selected from the group consisting of -C ₆ alkyl, C ₁ -C ₆ haloalkyl, C ₁ -C ₆ alkoxy, C ₁ -C ₆ haloalkoxy, cyano and nitro are more preferred.

It is ^also preferable either 1 or 2 substituents ^{R 101, R 102, R 103} , R 104 and ^{R 105} is a group represented by the formula (c-2), among ^{others, R 103} is A group represented by formula (c-2) is preferred. Examples of such a monomer include monomers selected from the formulas M1-1 to M1-7 and M1-17 to M1-21 as monomers having a cinnamic acid group. Moreover, as a monomer which has a benzoic acid group, the monomer chosen from said Formula M2-1 to M2-9 is mentioned.

  Examples of such cinnamic acid and derivatives thereof include cinnamic acid, 4-methoxycinnamic acid, 4-ethoxy cinnamic acid, 4-propoxy cinnamic acid, 4-fluoro cinnamic acid, and the like. 4- (6-methacryloxyhexyl-1-oxy) cinnamic acid, 4- (6-acryloxyhexyl-1-oxy) cinnamic acid, 4- (3-methacryloxypropyl-1-oxy) cinnamic Examples thereof include monomers having a cinnamic acid group such as acid and 4- (4- (6-methacryloxyhexyl-1-oxy) benzoyloxy) cinnamic acid.

  Examples of such benzoic acid and derivatives thereof include benzoic acid derivatives such as benzoic acid, 4-methoxybenzoic acid, 4-ethoxybenzoic acid, 4-propoxybenzoic acid, 4-fluorobenzoic acid; 4- (6- Methacryloxyhexyl-1-oxy) benzoic acid, 4- (6-acryloxyhexyl-1-oxy) benzoic acid, 4- (3-methacryloxypropyl-1-oxy) benzoic acid, 4- (4- (6 -Methacryloxyhexyl-1-oxy) benzoyloxy) monomers having a benzoic acid group such as benzoic acid.

  When the component (C) is contained in the polymer composition of the present invention, the content is preferably 3 parts by mass to 100 parts by mass per 100 parts by mass of the side chain polymer of the component (A). When the content of the component (C) is less than 3 parts by mass, the irradiation margin is not improved. Moreover, the solvent tolerance of the cured film obtained may fall that content of (C) component exceeds 100 mass parts and is excessive.

<Organic solvent>
The organic solvent used in the polymer composition of the present invention is not particularly limited as long as it is an organic solvent that dissolves the resin component. Specific examples are given below.
N, N-dimethylformamide, N, N-dimethylacetamide, N-methyl-2-pyrrolidone, N-methylcaprolactam, 2-pyrrolidone, N-ethylpyrrolidone, N-vinylpyrrolidone, dimethylsulfoxide, tetramethylurea, pyridine, Dimethylsulfone, hexamethylsulfoxide, γ-butyrolactone, 3-methoxy-N, N-dimethylpropanamide, 3-ethoxy-N, N-dimethylpropanamide, 3-butoxy-N, N-dimethylpropanamide, 1,3 -Dimethyl-imidazolidinone, ethyl amyl ketone, methyl nonyl ketone, methyl ethyl ketone, methyl isoamyl ketone, methyl isopropyl ketone, cyclohexanone, ethylene carbonate, propylene carbonate, diglyme, 4-hydroxy-4 Methyl-2-pentanone, 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 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, Isopropyl alcohol, methoxymethylpentanol, methyl 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 group Cole 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, 3-methyl-3-methoxybutanol, diisopropyl ether, ethyl isobutyl ether, diisobutylene, amyl acetate, butyl butyrate, butyl ether, diisobutyl ketone, methylcyclohexene, propyl ether, dihexyl ether 1-hexanol, n-hexane, n-pentane, n-octane, diethyl Ether, methyl lactate, ethyl lactate, methyl acetate, ethyl acetate, n-butyl acetate, propylene glycol monoethyl ether, methyl pyruvate, ethyl pyruvate, methyl 3-methoxypropionate, methyl ethyl 3-ethoxypropionate, 3 -Ethyl methoxypropionate, 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-mono Examples include ethyl ether-2-acetate, dipropylene glycol, 2- (2-ethoxypropoxy) propanol, lactate methyl ester, lactate ethyl ester, lactate n-propyl ester, lactate n-butyl ester, and lactate isoamyl ester. These may be used alone or in combination.

<Polymer composition>
The polymer composition of the present invention contains (A) a photosensitive side chain polymer that exhibits liquid crystallinity in a predetermined temperature range, (B) a dichroic dye, and an organic solvent. Moreover, the compound represented by the said Formula (c) is contained as needed.

[Preparation of polymer composition]
The polymer composition used in the present invention is preferably prepared as a coating solution so as to be suitable for forming an alignment layer. That is, the polymer composition used in the present invention is preferably prepared as a solution in which a resin component for forming a resin film is dissolved in an organic solvent. Here, the resin component is a resin component containing a photosensitive side chain polymer capable of exhibiting the liquid crystallinity already described. In that case, the content of the resin component is preferably 1% by mass to 20% by mass, more preferably 3% by mass to 15% by mass, and particularly preferably 3% by mass to 10% by mass.

In the polymer composition of the present embodiment, the resin component described above may be a photosensitive side chain polymer that can all exhibit the above-described liquid crystallinity, but does not impair the liquid crystal developing ability and the photosensitive performance. Other polymers may be mixed within the range. In that case, content of the other polymer in a resin component is 0.5 mass%-80 mass%, Preferably it is 1 mass%-50 mass%.
Examples of such other polymers include polymers that are made of poly (meth) acrylate, polyamic acid, polyimide, and the like and are not a photosensitive side chain polymer that can exhibit liquid crystallinity.

  The polymer composition used for this invention may contain components other than said (A), (B) and an organic solvent. Examples thereof include compounds that improve the film thickness uniformity and surface smoothness when the polymer composition is applied, compounds that improve the adhesion between the alignment layer and the substrate, and the like. It is not limited.

Examples of the compound that improves film thickness uniformity and surface smoothness include fluorine-based surfactants, silicone-based surfactants, and nonionic surfactants.
More specifically, for example, Ftop (registered trademark) 301, EF303, EF352 (manufactured by Tochem Products), MegaFac (registered trademark) F171, F173, R-30 (manufactured by DIC), Florard FC430, FC431 (Manufactured by Sumitomo 3M), Asahi Guard (registered trademark) AG710 (manufactured by Asahi Glass Company), Surflon (registered trademark) S-382, SC101, SC102, SC103, SC104, SC105, SC106 (manufactured by AGC Seimi Chemical Co., Ltd.) It is done. The use ratio of these surfactants is preferably 0.01 parts by mass to 2 parts by mass, more preferably 0.01 parts by mass to 1 part with respect to 100 parts by mass of the resin component contained in the polymer composition. Part by mass.

Specific examples of the compound that improves the adhesion between the alignment layer and the substrate include the following functional silane-containing compounds.
For example, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 2-aminopropyltrimethoxysilane, 2-aminopropyltriethoxysilane, N- (2-aminoethyl) -3-aminopropyltrimethoxysilane N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane, 3-ureidopropyltrimethoxysilane, 3-ureidopropyltriethoxysilane, N-ethoxycarbonyl-3-aminopropyltrimethoxysilane, N-ethoxy Carbonyl-3-aminopropyltriethoxysilane, N-triethoxysilylpropyltriethylenetriamine, N-trimethoxysilylpropyltriethylenetriamine, 10-trimethoxysilyl-1,4,7-triazadecane, 10-to Ethoxysilyl-1,4,7-triazadecane, 9-trimethoxysilyl-3,6-diazanonyl acetate, 9-triethoxysilyl-3,6-diazanonyl acetate, N-benzyl-3-aminopropyltri Methoxysilane, N-benzyl-3-aminopropyltriethoxysilane, N-phenyl-3-aminopropyltrimethoxysilane, N-phenyl-3-aminopropyltriethoxysilane, N-bis (oxyethylene) -3-amino Examples thereof include propyltrimethoxysilane, N-bis (oxyethylene) -3-aminopropyltriethoxysilane.

  Furthermore, in addition to improving the adhesion between the substrate and the alignment layer, additives such as the following phenoplasts and epoxy group-containing compounds may be included in the polymer composition for the purpose of imparting heat resistance. . Specific phenoplast additives are shown below, but are not limited to this structure.

  Specific epoxy group-containing compounds include 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, glycerin diglycidyl ether, 2,2-dibromoneopentylglycol diglycidyl ether, 1,3,5,6-tetraglycidyl-2,4-hexanediol, N, N, N ′, N ′,-tetraglycidyl-m-xylenediamine, 1,3-bis (N, N-diglycidylaminomethyl) cyclohexane, N, N, N ′, N ′,-tetraglycidyl-4 4'-diaminodiphenylmethane and the like.

  When using the compound which improves adhesiveness with a board | substrate, it is preferable that the usage-amount is 0.1 mass part-30 mass parts with respect to 100 mass parts of the resin component contained in a polymer composition. More preferably, it is 1 mass part-20 mass parts. If the amount used is less than 0.1 parts by mass, the effect of improving the adhesion cannot be expected, and if it exceeds 30 parts by mass, the orientation of the liquid crystal may deteriorate.

A photosensitizer can also be used as an additive. Colorless and triplet sensitizers are preferred.
As photosensitizers, aromatic nitro compounds, coumarins (7-diethylamino-4-methylcoumarin, 7-hydroxy-4-methylcoumarin), ketocoumarins, carbonyl biscoumarins, aromatic 2-hydroxyketones, and amino substituted Aromatic 2-hydroxyketone (2-hydroxybenzophenone, mono- or di-p- (dimethylamino) -2-hydroxybenzophenone), acetophenone, anthraquinone, xanthone, thioxanthone, benzanthrone, thiazoline (2-benzoylmethylene-3 -Methyl-β-naphthothiazoline, 2- (β-naphthoylmethylene) -3-methylbenzothiazoline, 2- (α-naphthoylmethylene) -3-methylbenzothiazoline, 2- (4-biphenoylmethylene)- 3-methylbenzothia Phosphorus, 2- (β-naphthoylmethylene) -3-methyl-β-naphthothiazoline, 2- (4-biphenoylmethylene) -3-methyl-β-naphthothiazoline, 2- (p-fluorobenzoylmethylene)- 3-methyl-β-naphthothiazoline), oxazoline (2-benzoylmethylene-3-methyl-β-naphthoxazoline, 2- (β-naphthoylmethylene) -3-methylbenzoxazoline, 2- (α-naphthoylmethylene) ) -3-methylbenzoxazoline, 2- (4-biphenoylmethylene) -3-methylbenzoxazoline, 2- (β-naphthoylmethylene) -3-methyl-β-naphthoxazoline, 2- (4-biphenoyl) Methylene) -3-methyl-β-naphthoxazoline, 2- (p-fluorobenzoylmethylene) -3-methyl-β- Ftoxazoline), benzothiazole, nitroaniline (m- or p-nitroaniline, 2,4,6-trinitroaniline) or nitroacenaphthene (5-nitroacenaphthene), (2-[(m-hydroxy-p -Methoxy) styryl] benzothiazole, benzoin alkyl ether, N-alkylated phthalone, acetophenone ketal (2,2-dimethoxyphenylethanone), naphthalene, anthracene (2-naphthalenemethanol, 2-naphthalenecarboxylic acid, 9-anthracenemethanol And 9-anthracenecarboxylic acid), benzopyran, azoindolizine, melocoumarin and the like.
Aromatic 2-hydroxyketone (benzophenone), coumarin, ketocoumarin, carbonyl biscoumarin, acetophenone, anthraquinone, xanthone, thioxanthone, and acetophenone ketal are preferred.

Moreover, this invention relates to the manufacturing method of the board | substrate and change element using the said polymer composition.
A method for producing a substrate having a liquid crystal alignment film formed from the polymer composition of the present invention,
[I] (A) A polymer composition containing a photosensitive side chain polymer exhibiting liquid crystallinity in a predetermined temperature range, (B) a dichroic dye and an organic solvent is applied onto a substrate. Forming a coating film;
[II] a step of irradiating the coating film obtained in [I] with polarized ultraviolet rays; and [III] a step of heating the coating film obtained in [II];
Have
Through the above steps, a liquid crystal alignment film having an alignment control ability can be obtained, and a substrate having the liquid crystal alignment film can be obtained.

The manufacturing method of the polarizing element is as follows:
[IV] A step of preparing a substrate having an alignment layer obtained above; and a step selected from [V-1] and [V-2] below.
[V-1] By applying a polarizing layer forming composition containing (B) a dichroic dye and (D) a polymerizable liquid crystal on the alignment layer of the substrate having the alignment layer, and drying by heating. Forming a coating film and irradiating the obtained coating film with ultraviolet rays;
[V-2] A step of applying a polarizing layer-forming composition containing a pigment having (E) lyotropic liquid crystal properties onto an alignment layer of a substrate having the alignment layer, and forming a coating film by heating and drying. .
Thereby, a polarizing element can be obtained.

Hereinafter, each process of [I]-[III] and [IV] which the manufacturing method of this invention has is demonstrated.
<Process [I]>
In step [I], a polymer composition containing (A) a photosensitive side chain polymer that exhibits liquid crystallinity in a predetermined temperature range, (B) a dichroic dye, and an organic solvent on a substrate. Apply to form a coating film.

<Board>
The substrate is usually a transparent substrate. When the substrate of the polarizing plate of the present invention (hereinafter sometimes referred to as the present polarizing plate) is not installed on the display surface of the display element, for example, a polarizing film obtained by removing the substrate from the polarizing plate is used as the display surface of the display element. In the case of installation, the substrate may not be transparent. The transparent substrate means a substrate having transparency capable of transmitting light, particularly visible light, and the transparency means a characteristic that the transmittance with respect to a light beam having a wavelength of 380 to 780 nm is 80% or more. Specific examples of the transparent substrate include a translucent resin substrate. As the resin constituting the translucent resin substrate, polyolefin such as polyethylene and polypropylene; cyclic olefin resin such as norbornene polymer; polyvinyl alcohol; polyethylene terephthalate; polymethacrylate ester; polyacrylate ester; triacetylcellulose, diacetyl Cellulose esters such as cellulose and cellulose acetate propionate; polyethylene naphthalate; polycarbonate; polysulfone; polyethersulfone; polyetherketone; polyphenylene sulfide and polyphenylene oxide. From the viewpoint of easy availability and transparency, polyethylene terephthalate, polymethacrylic acid ester, cellulose ester, cyclic olefin resin or polycarbonate is preferred.

  Cellulose ester is obtained by esterifying a part or all of hydroxyl groups contained in cellulose, and can be easily obtained from the market. Cellulose ester base materials can also be easily obtained from the market. Examples of commercially available cellulose ester substrates include “Fujitac Film” (Fuji Photo Film Co., Ltd.); “KC8UX2M”, “KC8UY” and “KC4UY” (Konica Minolta Opto Co., Ltd.).

  Cyclic olefin resin is easily available from the market. Commercially available cyclic olefin resins include “Topas” [Ticona (Germany)], “Arton” [JSR Corporation], “ZEONOR” [Nippon Zeon Corporation], and “ZEONEX”. [Nippon Zeon Co., Ltd.] and “Apel” [Mitsui Chemicals Co., Ltd.]. Such a cyclic olefin resin can be formed into a substrate by, for example, forming a film by a known means such as a solvent casting method or a melt extrusion method. A commercially available cyclic olefin resin substrate can also be used. Commercially available cyclic olefin resin base materials include “Essina” [Sekisui Chemical Co., Ltd.], “SCA40” [Sekisui Chemical Co., Ltd.], “Zeonor Film” [Optes Co., Ltd.], and “Arton Film”. [JSR Corporation].

  When the cyclic olefin-based resin is a copolymer of a cyclic olefin and an aromatic compound having a chain olefin or a vinyl group, the content ratio of the structural unit derived from the cyclic olefin is the total structural unit of the copolymer. On the other hand, it is usually 50 mol% or less, preferably 15 to 50 mol%. Examples of the chain olefin include ethylene and propylene, and examples of the aromatic compound having a vinyl group include styrene, α-methylstyrene, and alkyl-substituted styrene. When the cyclic olefin-based resin is a ternary copolymer of a cyclic olefin, a chain olefin, and an aromatic compound having a vinyl group, the content ratio of the structural unit derived from the chain olefin is that of the copolymer. The content of the structural unit derived from the aromatic compound having a vinyl group is usually 5 to 80 mol% with respect to the total structural unit, and the content of the structural unit derived from the aromatic compound having a vinyl group is usually 5 to 80 mol%. It is. Such a terpolymer has the advantage that the amount of expensive cyclic olefin used can be relatively reduced in its production.

  The characteristics required for the substrate vary depending on the configuration of the polarizing plate, but usually a substrate having as small a retardation as possible is preferable. Examples of the substrate having as little retardation as possible include cellulose ester films having no phase difference such as zero tack (Konica Minolta Opto Co., Ltd.) and Z tack (Fuji Film Co., Ltd.). Further, an unstretched cyclic olefin resin substrate is also preferable.

  The surface of the substrate on which the polarizing layer is not formed may be subjected to a hard coat treatment, an antireflection treatment, an antistatic treatment or the like. In addition, the hard coat layer may contain additives such as an ultraviolet absorber as long as the performance is not affected.

  If the thickness of the substrate is too thin, the strength tends to decrease and the workability tends to be inferior, so it is usually 5 to 300 μm, preferably 20 to 200 μm.

The method for applying the polymer composition described above on the substrate is not particularly limited.
In general, the application method is generally performed by screen printing, offset printing, flexographic printing, an inkjet method, or the like. Other coating methods include a dipping method, a roll coater method, a slit coater method, a spinner method (rotary coating method), or a spray method, and these may be used depending on the purpose.

  After the polymer composition is applied on the substrate, it is heated at 50 to 230 ° C., preferably at 50 to 200 ° C. for 0.4 minutes to 60 minutes by a heating means such as a hot plate, a thermal circulation oven or an IR (infrared) oven. The coating film can be obtained by evaporating the solvent for 5 minutes, preferably 0.5 minutes to 10 minutes. The drying temperature at this time is preferably lower than the liquid crystal phase expression temperature of the side chain polymer.

  The thickness of the coating film is disadvantageous in terms of anisotropy if it is too thick, and if it is too thin, there is a problem with the polarization properties, so it is usually in the range of 10 nm to 10000 nm, preferably in the range of 10 nm to 1000 nm. More preferably, it is 500 nm or less, More preferably, it is the range of 10 nm-300 nm.

  In addition, it is also possible to provide the process of cooling the board | substrate with which the coating film was formed to room temperature after the [I] process and before the following [II] process.

<Process [II]>
In step [II], the coating film obtained in step [I] is irradiated with polarized ultraviolet rays. When irradiating the surface of the coating film with polarized ultraviolet rays, the substrate is irradiated with polarized ultraviolet rays through a polarizing plate from a certain direction. As the ultraviolet rays to be used, ultraviolet rays having a wavelength in the range of 100 nm to 400 nm can be used. Preferably, the optimum wavelength is selected through a filter or the like depending on the type of coating film to be used. For example, ultraviolet rays having a wavelength in the range of 290 nm to 400 nm can be selected and used so that the photocrosslinking reaction can be selectively induced. As the ultraviolet light, for example, light emitted from a high-pressure mercury lamp can be used.

  The irradiation amount of polarized ultraviolet rays depends on the coating film used. The amount of irradiation is polarized ultraviolet light that realizes the maximum value of ΔA (hereinafter also referred to as ΔAmax), which is the difference between the ultraviolet light absorbance in a direction parallel to the polarization direction of polarized ultraviolet light and the ultraviolet light absorbance in a direction perpendicular to the polarization direction of the polarized ultraviolet light. The amount is preferably in the range of 1% to 70%, more preferably in the range of 1% to 50%.

<Step [III]>
In step [III], the ultraviolet-irradiated coating film polarized in step [II] is heated. An orientation control ability can be imparted to the coating film by heating.
For heating, a heating means such as a hot plate, a heat circulation type oven, or an IR (infrared) type oven can be used. The heating temperature can be determined in consideration of the temperature at which the liquid crystallinity of the coating film used is developed.

The heating temperature is preferably within the temperature range of the temperature at which the side chain polymer exhibits liquid crystallinity (hereinafter referred to as liquid crystal expression temperature). In the case of a thin film surface such as a coating film, the liquid crystal expression temperature on the coating film surface is expected to be lower than the liquid crystal expression temperature when a photosensitive side chain polymer that can exhibit liquid crystallinity is observed in bulk. The Therefore, the heating temperature is more preferably within the temperature range of the liquid crystal expression temperature on the coating film surface. That is, the temperature range of the heating temperature after irradiation with polarized ultraviolet rays is 10 ° C. lower than the lower limit of the temperature range of the liquid crystal expression temperature of the side chain polymer used, and 10 ° C. lower than the upper limit of the liquid crystal temperature range. It is preferable that it is the temperature of the range which makes an upper limit. If the heating temperature is lower than the above temperature range, the anisotropic amplification effect due to heat in the coating film tends to be insufficient, and if the heating temperature is too higher than the above temperature range, the state of the coating film Tends to be close to an isotropic liquid state (isotropic phase), and in this case, self-organization may make it difficult to reorient in one direction.
The liquid crystal expression temperature is not less than the glass transition temperature (Tg) at which the side chain polymer or coating film surface undergoes a phase transition from the solid phase to the liquid crystal phase, and from the liquid crystal phase to the isotropic phase (isotropic phase). It means a temperature below the isotropic phase transition temperature (Tiso) that causes a phase transition.

The thickness of the coating film formed after heating is preferably 5 nm to 500 nm, more preferably 50 nm to 300 nm, for the same reason described in the step [I].
By having the above steps, the production method of the present invention can realize highly efficient introduction of anisotropy into the coating film. And the board | substrate with an alignment layer can be manufactured highly efficiently.

The manufacturing method of the board | substrate with a coating film of this invention irradiates the polarized ultraviolet-ray, after apply | coating a polymer composition on a board | substrate and forming a coating film. Next, by heating, high-efficiency anisotropy is introduced into the side chain polymer film, and a substrate with a liquid crystal alignment film having a liquid crystal alignment control ability is manufactured.
The coating film used in the present invention realizes the introduction of highly efficient anisotropy into the coating film by utilizing the principle of molecular reorientation induced by the side chain photoreaction and liquid crystallinity. . In the production method of the present invention, in the case of a structure having a photocrosslinkable group as a photoreactive group in the side chain polymer, after forming a coating film on the substrate using the side chain polymer, polarized ultraviolet rays are formed. After irradiation and then heating, a polarizing element is prepared.

  Therefore, the coating film used in the method of the present invention is an alignment layer in which anisotropy is introduced with high efficiency and alignment control ability is excellent by sequentially irradiating the coating film with polarized ultraviolet rays and heat treatment. be able to.

  And in the coating film used for the method of this invention, the irradiation amount of the polarized ultraviolet-ray to a coating film, and the heating temperature in heat processing are optimized. Thereby, introduction of anisotropy into the coating film with high efficiency can be realized.

  The optimum irradiation amount of polarized ultraviolet rays for introducing highly efficient anisotropy into the coating film used in the present invention is such that the photosensitive group undergoes photocrosslinking reaction, photoisomerization reaction, or photofries rearrangement reaction in the coating film. Corresponds to the irradiation amount of polarized ultraviolet rays to optimize the amount. As a result of irradiating the coating film used in the present invention with polarized ultraviolet rays, if the photo-crosslinking reaction, photoisomerization reaction, or photo-fleece rearrangement reaction has few photosensitive groups in the side chain, the amount of photoreaction will not be sufficient. . In that case, sufficient self-organization does not proceed even after heating. On the other hand, as a result of irradiating polarized ultraviolet rays to the structure having a photocrosslinkable group in the coating film used in the present invention, the crosslinking reaction between the side chains is caused when the photosensitive group of the side chain undergoing the crosslinking reaction becomes excessive. Too much progress. In that case, the resulting film may become rigid and hinder the progress of self-assembly by subsequent heating. In addition, when the coating film used in the present invention is irradiated with polarized ultraviolet rays to the structure having the light Fleece rearrangement group, if the photosensitive group of the side chain that undergoes the light Fleece rearrangement reaction becomes excessive, the liquid crystallinity of the coating film Will drop too much. In that case, the liquid crystallinity of the obtained film is also lowered, which may hinder the progress of self-assembly by subsequent heating. Furthermore, when irradiating polarized ultraviolet light to a structure having a photo-fleece rearrangement group, if the amount of ultraviolet light irradiation is too large, the side-chain polymer is photodegraded, preventing the subsequent self-organization by heating. It may become.

  Therefore, in the coating film used in the present invention, the optimum amount of the photopolymerization reaction, photoisomerization reaction, or photofleece rearrangement reaction of the side chain photosensitive group by irradiation with polarized ultraviolet rays is the side chain polymer film. It is preferable to make it 0.1 mol%-40 mol% of the photosensitive group which has, and it is more preferable to set it as 0.1 mol%-20 mol%. By making the amount of the photo-reactive side chain photosensitive group within such a range, the self-organization in the subsequent heat treatment proceeds efficiently, and the formation of highly efficient anisotropy in the film is possible. Become.

  In the coating film used in the method of the present invention, by optimizing the irradiation amount of polarized ultraviolet rays, photocrosslinking reaction or photoisomerization reaction of photosensitive groups or photofleece rearrangement reaction in the side chain of the side chain polymer film Optimize the amount of. Then, in combination with the subsequent heat treatment, highly efficient introduction of anisotropy into the coating film used in the present invention is realized. In that case, a suitable amount of polarized ultraviolet rays can be determined based on the evaluation of ultraviolet absorption of the coating film used in the present invention.

  That is, the ultraviolet absorption in the direction parallel to the polarization direction of polarized ultraviolet light and the ultraviolet absorption in the vertical direction after irradiation with polarized ultraviolet light are measured for the coating film used in the present invention. From the measurement result of ultraviolet absorption, ΔA, which is the difference between the ultraviolet absorbance in the direction parallel to the polarization direction of polarized ultraviolet rays and the ultraviolet absorbance in the direction perpendicular to the polarization direction of the polarized ultraviolet rays, is evaluated. Then, the maximum value of ΔA (ΔAmax) realized in the coating film used in the present invention and the irradiation amount of polarized ultraviolet light that realizes it are obtained. In the production method of the present invention, a preferable amount of polarized ultraviolet rays to be irradiated in the production of the liquid crystal alignment film can be determined on the basis of the amount of polarized ultraviolet rays to realize this ΔAmax.

  In the production method of the present invention, the irradiation amount of polarized ultraviolet rays on the coating film used in the present invention is preferably in the range of 1% to 70% of the amount of polarized ultraviolet rays realizing ΔAmax. More preferably, it is within the range of 50%. In the coating film used in the present invention, the irradiation amount of polarized ultraviolet rays within the range of 1% to 50% of the amount of polarized ultraviolet rays realizing ΔAmax is 0. 0% of the entire photosensitive group of the side chain polymer film. 1 mol% to 20 mol% corresponds to the amount of polarized ultraviolet light that undergoes a photocrosslinking reaction.

  From the above, in the production method of the present invention, in order to achieve highly efficient anisotropy introduction into the coating film, a suitable heating temperature as described above is set based on the liquid crystal temperature range of the side chain polymer. It is good to decide. Therefore, for example, when the liquid crystal temperature range of the side chain polymer used in the present invention is 60 ° C. to 200 ° C., the heating temperature after irradiation with polarized ultraviolet light is desirably 50 ° C. to 190 ° C. By doing so, greater anisotropy is imparted to the coating film used in the present invention.

  By doing so, the polarizing element provided by the present invention exhibits high reliability against external stresses such as light and heat.

<Polarizing layer forming composition>

  The polarizing layer forming composition used for forming the polarizing element of the present invention contains (B) a dichroic dye and (D) a polymerizable liquid crystal or (E) a dye having lyotropic liquid crystallinity. It is a composition. The polarizing layer forming composition containing (B) a dichroic dye and (D) a polymerizable liquid crystal usually contains a solvent, and the solvent is the same as the solvent contained in the above-mentioned orientation polymer composition. (D) It can select suitably according to the solubility of a polymeric liquid crystal.

  (E) The composition containing the pigment having lyotropic liquid crystallinity usually contains a solvent, and the solvent is not particularly limited, and a conventionally known solvent can be used, but an aqueous solvent is preferable. Examples of the aqueous solvent include water, a hydrophilic solvent, a mixed solvent of water and a hydrophilic solvent, and the like. The hydrophilic solvent is a solvent that dissolves substantially uniformly in water. Examples of the hydrophilic solvent include alcohols such as methanol and isopropyl alcohol; glycols such as ethylene glycol; cellosolves such as methyl cellosolve and ethyl cellosolve; ketones such as acetone and methylethylketone; esters such as ethyl acetate; Is mentioned. As the aqueous solvent, water or a mixed solvent of water and a hydrophilic solvent is preferably used.

  (B) The above-mentioned (B) component is used as a dichroic dye.

<(D) Polymerizable liquid crystal>
(D) A polymerizable liquid crystal is a compound having a polymerizable group and exhibiting liquid crystallinity.
The polymerizable group means a group involved in the polymerization reaction, and is preferably a photopolymerizable group. Here, the photopolymerizable group refers to a group capable of undergoing a polymerization reaction with an active radical or an acid generated from a photopolymerization initiator described later. Examples of the polymerizable group include a vinyl group, vinyloxy group, 1-chlorovinyl group, isopropenyl group, 4-vinylphenyl group, acryloyloxy group, methacryloyloxy group, oxiranyl group, and oxetanyl group. Among them, acryloyloxy group, methacryloyloxy group, vinyloxy group, oxiranyl group and oxetanyl group are preferable, and acryloyloxy group is more preferable. The compound exhibiting liquid crystallinity may be a thermotropic liquid crystal or a lyotropic liquid crystal, and may be a nematic liquid crystal or a smectic liquid crystal in the thermotropic liquid crystal.

The polymerizable liquid crystal is preferably a smectic liquid crystal compound and more preferably a higher order smectic liquid crystal compound in that higher polarization characteristics can be obtained. Among these, higher-order smectic liquid crystal compounds that form a smectic B phase, a smectic D phase, a smectic E phase, a smectic F phase, a smectic G phase, a smectic H phase, a smectic I phase, a smectic J phase, a smectic K phase, or a smectic L phase. More preferred are higher order smectic liquid crystal compounds that form a smectic B phase, a smectic F phase, or a smectic I phase. When the liquid crystal phase formed by the polymerizable liquid crystal compound is a higher order smectic phase, a polarizing film having a higher degree of alignment order can be produced. Further, such a long polarizing film having a high degree of orientational order can obtain a Bragg peak derived from a higher order structure such as a hexatic phase or a crystal phase in X-ray diffraction measurement. The Bragg peak is a peak derived from a periodic structure of molecular orientation, and when the liquid crystal phase formed by the polymerizable liquid crystal compound is a higher order smectic phase, the periodic interval is 3.0 to 6.0 Å. A membrane can be obtained.
Specific examples of such a compound include a compound represented by the following formula (d) (hereinafter sometimes referred to as compound (d)). The polymerizable liquid crystal compounds may be used alone or in combination.
^{U 1 -V 1 -W 1 -X 1} -Y 1 -X 2 -Y 2 -X 3 -W 2 -V 2 -U 2 (d)
[In the formula (d),
X ¹ , X ² and X ³ each independently represent a 1,4-phenylene group which may have a substituent or a cyclohexane-1,4-diyl group which may have a substituent. However, at least one of X ¹ , X ² and X ³ is a 1,4-phenylene group which may have a substituent. —CH ₂ — constituting the cyclohexane-1,4-diyl group may be replaced by —O—, —S— or —NR—. R represents an alkyl group having 1 to 6 carbon atoms or a phenyl group.
Y ¹ and ^{Y 2,} independently of one _{another, -CH 2 CH 2 -, -} CH 2 O -, - COO -, - OCOO-, a single ^{bond, -N = N -, - CR} a = CR b -, - C≡C— or —CR ^a ═N— is represented.
R ^a and R ^b each independently represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms.
U ¹ represents a hydrogen atom or a polymerizable group.
U ² represents a polymerizable group.
W ¹ and W ² each independently represent a single bond, —O—, —S—, —COO— or —OCOO—.
V ¹ and V ² each independently represent an optionally substituted alkanediyl group having 1 to 20 carbon atoms, and —CH ₂ — constituting the alkanediyl group is —O—, -S- or -NH- may be substituted. ]

In the compound (d), at least one of X ¹ , X ² and X ³ is preferably a 1,4-phenylene group which may have a substituent.
The 1,4-phenylene group which may have a substituent is preferably unsubstituted. The cyclohexane-1,4-diyl group which may have a substituent is preferably a trans-cyclohexane-1,4-diyl group which may have a substituent. It is preferable that the trans-cyclohexane-1,4-diyl group which may have a non-substituted group.

  The optionally substituted 1,4-phenylene group which may have a substituent or the optionally substituted cyclohexane-1,4-diyl group includes a methyl group, an ethyl group and a butyl group. Examples thereof include an alkyl group having 1 to 4 carbon atoms such as a group, a cyano group, and a halogen atom.

Y ¹ is preferably —CH ₂ CH ₂ —, —COO— or a single bond, and Y ² is preferably —CH ₂ CH ₂ — or —CH ₂ O—.

U ² is a polymerizable group. U ¹ is a hydrogen atom or a polymerizable group, and preferably a polymerizable group. U ¹ and U ² are both preferably a polymerizable group, and both are preferably a photopolymerizable group. The polymerizable liquid crystal compound having a photopolymerizable group is advantageous in that it can be polymerized under a lower temperature condition.

The polymerizable groups represented by U ¹ and U ² may be different from each other independently, but are preferably the same. Examples of the polymerizable group include a vinyl group, vinyloxy group, 1-chlorovinyl group, isopropenyl group, 4-vinylphenyl group, acryloyloxy group, methacryloyloxy group, oxiranyl group, and oxetanyl group. Among them, acryloyloxy group, methacryloyloxy group, vinyloxy group, oxiranyl group and oxetanyl group are preferable, and acryloyloxy group is more preferable.

Examples of the alkanediyl group represented by V ¹ and V ² include a methylene group, an ethylene group, a propane-1,3-diyl group, a butane-1,3-diyl group, a butane-1,4-diyl group, and a pentane- 1,5-diyl group, hexane-1,6-diyl group, heptane-1,7-diyl group, octane-1,8-diyl group, decane-1,10-diyl group, tetradecane-1,14-diyl Group and icosane-1,20-diyl group and the like. V ¹ and V ² are preferably alkanediyl groups having 2 to 12 carbon atoms, more preferably alkanediyl groups having 6 to 12 carbon atoms.
Examples of the substituent that the alkanediyl group having 1 to 20 carbon atoms which may have a substituent optionally include a cyano group and a halogen atom, and the alkanediyl group is unsubstituted. It is more preferable that it is an unsubstituted and linear alkanediyl group.

W ¹ and W ² are independently of each other, preferably a single bond or —O—.

  Specific examples of the compound (d) include compounds represented by the formula (1-1) to the formula (1-23). When the compound (d) has a cyclohexane-1,4-diyl group, the cyclohexane-1,4-diyl group is preferably a trans isomer.

  Among the exemplified compounds (d), Formula (1-2), Formula (1-3), Formula (1-4), Formula (1-6), Formula (1-7), Formula (1-8) , At least one selected from the group consisting of compounds represented by formula (1-13), formula (1-14) and formula (1-15), respectively.

The exemplified compound (d) can be used alone or in combination for a long polarizing film.
Moreover, when combining 2 or more types of polymeric liquid crystal compounds, it is preferable that at least 1 type is a compound (c), and it is more preferable that 2 or more types are a compound (d). In combination, the liquid crystallinity may be temporarily maintained even at a temperature lower than the liquid crystal-crystal phase transition temperature. The mixing ratio when combining two kinds of polymerizable liquid crystal compounds is usually 1:99 to 50:50, preferably 5:95 to 50:50, and more preferably 10:90 to 50:50. is there.

  Compound (d) can be prepared, for example, by Lub et al. Recl. Trav. Chim. Pays-Bas, 115, 321-328 (1996), or a known method described in Japanese Patent No. 4719156.

<(E) Dye having lyotropic liquid crystal properties>
When the polarizing layer contains (E) a dye having lyotropic liquid crystallinity, the dye is not particularly limited as long as it has lyotropic liquid crystallinity and can form a supramolecular aggregate.
Examples of such lyotropic liquid crystalline dyes include azo compounds, anthraquinone compounds, perylene compounds, quinophthalone compounds, naphthoquinone compounds, merocyanine compounds, and the like. An azo compound is preferably used because it exhibits good lyotropic liquid crystallinity.

Among the azo compounds, azo compounds having an aromatic ring in the molecule are preferable, and disazo compounds having a naphthalene ring are more preferable. By applying and drying a coating solution containing such an azo compound, a polarizing layer having excellent polarization characteristics can be obtained.
The azo compound is preferably an azo compound having a polar group in the molecule. An azo compound having a polar group is soluble in an aqueous solvent, and is easily dissolved in an aqueous solvent to form a supramolecular aggregate. For this reason, the coating liquid containing an azo compound having a polar group exhibits particularly good lyotropic liquid crystallinity.
The polar group means a functional group having polarity. Examples of the polar group include oxygen and / or nitrogen-containing functional groups having a relatively high electronegativity such as OH group, COOH group, NH ₂ group, NO ₂ group, and CN group.

  As the azo compound having a polar group, for example, an aromatic disazo compound represented by the following general formula (E-1) is preferable.

In General Formula (E-1), Q ¹ represents a substituted or unsubstituted aryl group, Q ² represents a substituted or unsubstituted arylene group, and R ^E independently represents a hydrogen atom, a substituted or Represents an unsubstituted alkyl group, a substituted or unsubstituted acetyl group, a substituted or unsubstituted benzoyl group, a substituted or unsubstituted phenyl group, M represents a counter ion, and m7 represents an integer of 0 to 2. , N7 represents an integer of 0-6. However, at least one of m7 and n7 is not 0 but 1 ≦ m7 + n7 ≦ 6. When m7 is 2, each R ^E is the same or different.
OH, (NHR ^E ) _m7 , and (SO ₃ M) _n7 shown in the general formula (E-1) may be bonded to any of the seven substitution sites of the naphthyl ring.
In the present specification, “substituted or unsubstituted” means “substituted with a substituent or not substituted with a substituent”.

  The bonding position of the naphthyl group and the azo group (—N═N—) of the general formula (E-1) is not particularly limited. The naphthyl group refers to a naphthyl group represented on the right side in the formula (E-1). Preferably, the naphthyl group and the azo group are bonded at the 1-position or 2-position of the naphthyl group.

When the alkyl group, acetyl group, benzoyl group, or phenyl group of R ^{E in} the general formula (E-1) has a substituent, the substituent is exemplified by the following aryl group or arylene group. Is mentioned.
R ¹ is preferably a hydrogen atom, a substituted or unsubstituted alkyl group, a substituted or unsubstituted acetyl group, and more preferably a hydrogen atom.
Examples of the substituted or unsubstituted alkyl group include substituted or unsubstituted alkyl groups having 1 to 6 carbon atoms.

M (counter ion) in the general formula (E-1) is preferably a hydrogen ion; an alkali metal ion such as Li, Na, K, or Cs; an alkaline earth metal ion such as Ca, Sr, or Ba; Metal ions; ammonium ions optionally substituted with alkyl groups or hydroxyalkyl groups; salts of organic amines, and the like. Examples of the metal ions include Ni ⁺ , Fe ³⁺ , Cu ²⁺ , Ag ⁺ , Zn ²⁺ , Al ³⁺ , Pd ²⁺ , Cd ²⁺ , Sn ²⁺ , Co ²⁺ , Mn ²⁺ , and Ce ³⁺ . Examples of the organic amine include alkylamines having 1 to 6 carbon atoms, alkylamines having 1 to 6 carbon atoms having a hydroxyl group, and alkylamines having 1 to 6 carbon atoms having a carboxyl group. In the above formula (E-1), when SO 3 _M is 2 or more, each M may be the same or different. In the general formula (E-1), when M of SO ₃ M is a cation having a valence of 2 or more, it is bonded to SO ₃ ⁻ of the other azo compound of the general formula (E-1). Thus, supramolecular aggregates can be formed.

M7 in the general formula (E-1) is preferably 1. Moreover, n7 of the general formula (E-1) is preferably 1 or 2.
Specific examples of the naphthyl group of the general formula (E-1) include, for example, the following formulas (Ea) to (E-1). R ^E and M in the formulas (Ea) to (E-1) are the same as those in the general formula (E-1).

In the general formula (E-1), examples of the aryl group represented by Q ¹ include a condensed ring group in which two or more benzene rings are condensed such as a naphthyl group in addition to a phenyl group.
Examples of the arylene group represented by Q ² include a phenylene group and a condensed ring group in which two or more benzene rings are condensed, such as a naphthylene group.

The aryl group of Q ¹ or the arylene group of Q ² may have a substituent, or may not have a substituent. Regardless of whether the aryl group or arylene group is substituted or unsubstituted, the aromatic disazo compound of the general formula (E-1) having a polar group is excellent in solubility in an aqueous solvent.

When the aryl group or arylene group has a substituent, examples of the substituent include an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, and an alkylamino having 1 to 6 carbon atoms. Group, phenylamino group, acylamino group having 1 to 6 carbon atoms, hydroxyalkyl group having 1 to 6 carbon atoms such as dihydroxypropyl group, carboxyl group such as COOM group, sulfonic acid group such as SO ₃ M group, hydroxyl group , Cyano group, nitro group, amino group, halogeno group and the like. Preferably, the substituent is one selected from the group consisting of an alkoxy group having 1 to 6 carbon atoms, a hydroxyalkyl group having 1 to 6 carbon atoms, a carboxyl group, a sulfonic acid group, and a nitro group. An aromatic disazo compound having such a substituent is particularly excellent in water solubility. These substituents may be substituted alone or in combination of two or more. Moreover, the said substituent may be substituted by arbitrary ratios.

Q ^{1 in the} general formula (E-1) is preferably a substituted or unsubstituted phenyl group, and more preferably a phenyl group having the substituent.
Q ² is preferably a substituted or unsubstituted naphthylene group, more preferably a naphthylene group having the substituent, and particularly preferably a 1,4-naphthylene group having the substituent.

An aromatic disazo compound in which Q ^{1 in the} general formula (E-1) is a substituted or unsubstituted phenyl group and Q ² is a substituted or unsubstituted 1,4-naphthylene group has the following general formula (E -2).

In the general formula (E-2), R ^E , M, m7 and n7 are the same as those in the general formula (E-1).
In the general formula (E-2), A ^E and B ^E represent substituents, and a and b represent the number of substitutions. A ^E and B ^E are each independently an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, an alkylamino group having 1 to 6 carbon atoms, a phenylamino group, or a carbon atom. number 1-6 acylamino group, a hydroxyalkyl group having 1 to 6 carbon atoms, such as dihydroxypropyl group, a carboxyl group, such as COOM group, a sulfonic acid group such as SO ₃ M group, a hydroxyl group, a cyano group, a nitro group, an amino Represents a halogeno group. The a is an integer of 0 to 5, and the b is an integer of 0 to 4. However, at least one of a and b is not 0. When the a is 2 or more, the substituents A and ^E may be the same or different. When b is 2 or more, the substituents ^BE may be the same or different.

Among the aromatic disazo compounds included in the general formula (E-2), it is preferable to use an aromatic disazo compound represented by the following general formula (E-3). In the aromatic disazo compound of the general formula (E-3), the substituent A ^E is bonded to the para position on the basis of the azo group (—N═N—). Furthermore, in the aromatic disazo compound of the general formula (E-3), the OH group of the naphthyl group is bonded to the position adjacent to the azo group (ortho position). If such an aromatic disazo compound of the general formula (E-3) is used, a polarizing plate having a high degree of polarization can be obtained.

In the general formula (E-3), R ^E , M, m7 and n7 are the same as those in the general formula (E-1), and A ^E is the same as that in the general formula (E-2). .
In general formula (E-3), p7 represents the integer of 0-4. The p7 is preferably 1 or 2, and more preferably 1.

Aromatic disazo compounds represented by the above general formulas (E-1) to (E-3) are, for example, “Theoretical Manufacturing Dye Chemistry (5th Edition)” written by Yutaka Hosoda (published by Gihodo on July 15, 1968, 135 to 152).
For example, the aromatic disazo compound of the general formula (E-3) is obtained by diazotizing and coupling an aniline derivative and a naphthalenesulfonic acid derivative to obtain a monoazo compound, and then diazotizing the monoazo compound. It can be synthesized by a coupling reaction with a 1-amino-8-naphtholsulfonic acid derivative.

  From the viewpoint of increasing the orientation of the liquid crystal compound, the content ratio of the (D) polymerizable liquid crystal compound or the (E) lyotropic liquid crystal in the polarizing layer forming composition is the solid content of the polarizing layer forming composition. On the other hand, it is 70-99.9 mass parts normally, Preferably it is 80-99.9 mass parts, More preferably, it is 85-99 mass parts, More preferably, it is 90-99 mass parts.

<Process [IV] and process [V]>
Step [IV] is a step of preparing a substrate having the above-mentioned alignment layer; and Step [V] is a step selected from [V-1] and [V-2] below.
[V-1] By applying a polarizing layer forming composition containing (B) a dichroic dye and (D) a polymerizable liquid crystal on the alignment layer of the substrate having the alignment layer, and drying by heating. Forming a coating film and irradiating the obtained coating film with ultraviolet rays;
[V-2] A step of applying a polarizing layer-forming composition containing a pigment having (E) lyotropic liquid crystal properties onto an alignment layer of a substrate having the alignment layer, and forming a coating film by heating and drying. .

  The application of the polarizing layer forming composition is usually performed by a coating method such as a spin coating method, an extrusion method, a gravure coating method, a die coating method, a bar coating method, or an applicator method, or a printing method such as a flexo method. It is done by the method. When the polarizing layer forming composition contains (D) polymerizable liquid crystal, it is dried by removing the solvent under the condition that (D) polymerizable liquid crystal contained in the obtained coating film is not normally polymerized after coating. A film is formed. Examples of the drying method include natural drying, ventilation drying, heat drying, and reduced pressure drying.

  In the step of irradiating the coating film containing (B) the dichroic dye and (D) the polymerizable liquid crystal with ultraviolet rays, (D) the polymerization of the polymerizable liquid crystal is a known method of polymerizing a compound having a polymerizable functional group. It can be done by a method. Specific examples include thermal polymerization and photopolymerization, and photopolymerization is preferred from the viewpoint of ease of polymerization. When polymerizing a polymerizable liquid crystal by photopolymerization, a composition containing a photopolymerization initiator is further applied to a polarizing layer forming composition containing (B) a dichroic dye and (D) a polymerizable liquid crystal, and then dried. It is preferable that the polymerizable liquid crystal in the dry film obtained in this manner is made into a liquid crystal phase and then photopolymerized while maintaining the liquid crystal state.

  Photopolymerization is usually carried out by irradiating the dry film with light. As the light to be irradiated, depending on the type of photopolymerization initiator contained in the dry film, (D) the type of polymerizable liquid crystal (particularly, (D) the type of photopolymerizable group possessed by the polymerizable liquid crystal) and the amount thereof, Specific examples include light selected from the group consisting of visible light, ultraviolet light, and laser light, and active electron beams. Among them, ultraviolet light is preferable in that it is easy to control the progress of the polymerization reaction and that a photopolymerization apparatus widely used in this field can be used, so that photopolymerization can be performed by ultraviolet light. (D) It is preferable to select the type of polymerizable liquid crystal or photopolymerization initiator. Further, at the time of polymerization, the polymerization temperature can be controlled by irradiating light while cooling the dry film by an appropriate cooling means. By adopting such a cooling means, if the polymerization of the polymerizable liquid crystal (D) is carried out at a lower temperature, a polarizing layer can be appropriately formed even if a substrate having a relatively low heat resistance is used.

Application in the step of forming a coating film by applying (E) a polarizing layer-forming composition containing a dye having lyotropic liquid crystal properties to the alignment layer of the substrate having the alignment layer and drying by heating is usually performed. , A spin coating method, an extrusion method, a gravure coating method, a die coating method, a bar coating method, a coating method such as an applicator method, and a printing method such as a flexo method. The drying method is not particularly limited, and natural drying or forced drying can be performed. Examples of forced drying include reduced-pressure drying, heat drying, and reduced-pressure heat drying. Preferably, natural drying is used.
The drying time can be appropriately selected depending on the drying temperature and the type of solvent. For example, in the case of natural drying, the drying time is preferably 1 second to 120 minutes, more preferably 10 seconds to 5 minutes.
The drying temperature is not particularly limited, but is preferably lower than the glass transition temperature (Tg) of the substrate. If the drying temperature exceeds the glass transition temperature of the substrate, the properties (such as mechanical strength and optical properties) of the substrate may be altered. Specifically, the drying temperature is preferably 10 ° C to 100 ° C, more preferably 10 ° C to 90 ° C, and particularly preferably 10 ° C to 80 ° C.
The drying temperature means the temperature of the atmosphere in which the coating film is dried, not the surface or internal temperature of the coating film containing a pigment having (E) lyotropic liquid crystallinity.

  In this polarizing element, the total thickness of the alignment layer and the polarizing layer is 10 μm or less. The thickness of the alignment layer is preferably 0.5 μm or more and 9.5 μm or less, and more preferably 1 μm or more and 5 μm or less. The thickness of the polarizing layer is preferably from 0.5 μm to 9.5 μm, and more preferably from 1 μm to 5 μm. The thickness of the alignment layer and the polarizing layer can be usually determined by measurement with an interference film thickness meter, a laser microscope or a stylus thickness meter.

As described above, the obtained polarizing element can be widely applied to various display elements that require polarized light by using a known technique. For example, an antireflection film such as a liquid crystal display element or an organic EL. (Circularly polarizing plate), optical switches, optical filters, and various optical measuring instruments having them as constituent elements.
EXAMPLES Hereinafter, although this invention is demonstrated using an Example, this invention is not limited to this Example.

  EXAMPLES Hereinafter, the present invention will be specifically described with reference to examples of the present invention, but the present invention is not construed as being limited thereto.

<Solvent>
Each resin composition of Examples and Comparative Examples contained a solvent, and propylene glycol monomethyl ether (PM), cyclohexanone (CYH), and methyl isobutyl ketone (MIBK) were used as the solvent.

<Measurement of molecular weight of polymer>
The molecular weight of the acrylic copolymer in the polymerization example is as follows using a room temperature gel permeation chromatography (GPC) apparatus (GPC-101) manufactured by Shodex Co., Ltd. and columns (KD-803, KD-805) manufactured by Shodex Co. And measured.
The following number average molecular weight (hereinafter referred to as Mn) and weight average molecular weight (hereinafter referred to as Mw) were expressed in terms of polystyrene.
Column temperature: 50 ° C
Eluent: N, N-dimethylformamide (as additives, lithium bromide-hydrate (LiBr · H ₂ O) is 30 mmol / L, phosphoric acid / anhydrous crystal (o-phosphoric acid) is 30 mmol / L, tetrahydrofuran (THF) is 10 mL / L)
Flow rate: 1.0 mL / min Standard sample for preparing a calibration curve: TSK standard polyethylene oxide (molecular weight: about 900,000, 150,000, 100,000, 30,000) manufactured by Tosoh Corporation and polyethylene glycol (manufactured by Polymer Laboratories) Molecular weight about 12,000, 4,000, 1,000).

<Synthesis Example 1>
4- (6-Hydroxyhexyloxy) cinnamic acid was synthesized by heating 1-hydroxycinnamic acid and 1-bromo-6-hexanol under alkaline conditions. This product was reacted with methacrylic acid chloride under basic conditions to obtain a compound (M1) represented by the following formula (Ex-1).

<Synthesis Example 2>
4- (6-hydroxyhexyloxy) benzoic acid was synthesized by heating 1-hydroxybenzoic acid and 1-bromo-6-hexanol under alkaline conditions. This product was reacted with methacrylic acid chloride under basic conditions to obtain a compound represented by the formula (Ex-A) (hereinafter also referred to as compound (Ex-A)). By reacting this compound (Ex-A) with methoxyphenol in the presence of DCC and DMAP, a compound represented by the following formula (Ex-2) was obtained.

<Synthesis Example 4>
16.0 g of the methacrylic acid ester represented by the above formula (Ex-1), 0.4 g of α, α′-azobisisobutyronitrile as a polymerization catalyst were dissolved in 180.0 g of 1,4-dioxane, and the mixture was heated to 80 ° C. For 20 hours to obtain an acrylic copolymer solution. The acrylic copolymer solution was gradually added dropwise to 1000.0 g of diethyl ether to precipitate a solid, and the residual monomer was removed by filtration and drying under reduced pressure to obtain an acrylic polymer (P1). Mn of the obtained acrylic copolymer was 9,300 and Mw was 16,000.

<Synthesis Example 5>
8.0 g of methacrylic acid ester represented by the above formula (Ex-1), 7.4 g of methacrylic acid ester represented by the above formula (Ex-A), α, α′-azobisisobutyronitrile as a polymerization catalyst 8 g was dissolved in 145.0 g of 1,4-dioxane and reacted at 80 ° C. for 20 hours to obtain an acrylic copolymer solution. The acrylic copolymer solution was gradually added dropwise to 1000.0 g of diethyl ether to precipitate a solid, and the residual monomer was removed by filtration and drying under reduced pressure to obtain an acrylic copolymer (P2). Mn of the obtained acrylic copolymer was 8,000 and Mw was 20,000.

<Synthesis Example 6>
10.0 g of methacrylic acid ester represented by the above formula (Ex-1), 5.3 g of methacrylic acid ester represented by the above formula (Ex-2), α, α′-azobisisobutyronitrile as a polymerization catalyst 2 g was dissolved in 165.0 g of 1,4-dioxane and reacted at 80 ° C. for 20 hours to obtain an acrylic copolymer solution. The acrylic copolymer solution was gradually added dropwise to 1000.0 g of diethyl ether to precipitate a solid, and the residual monomer was removed by filtration and drying under reduced pressure to obtain an acrylic copolymer (P3). Mn of the obtained acrylic copolymer was 11,000 and Mw was 21,000.

<Synthesis Example 7>
8.0 g of methacrylic acid ester represented by the above formula (Ex-1), 9.8 g of methacrylic acid ester represented by the above formula (Ex-2), α, α′-azobisisobutyronitrile as a polymerization catalyst 2 g was dissolved in 180.0 g of 1,4-dioxane and reacted at 80 ° C. for 20 hours to obtain an acrylic copolymer solution. The acrylic copolymer solution was gradually added dropwise to 1000.0 g of diethyl ether to precipitate a solid, and the residual monomer was removed by filtration and drying under reduced pressure to obtain an acrylic copolymer (P4). Mn of the obtained acrylic copolymer was 14,000 and Mw was 24,000.

<Production Example 1>
[Preparation of polarizing layer forming composition RM1]
14.6 g of polymerizable liquid crystal (RMM141C, manufactured by Merck) and 0.44 g of dichroic dye (G-241, manufactured by Hayashibara) are dissolved in 35.0 g of MIBK, and a polarizing layer forming composition having a solid content concentration of 30% by mass. Product (RM1) was prepared.

<Production Example 2>
[Preparation of polarizing layer forming composition RM2]
A polymerizable liquid crystal (RMM141C, manufactured by Merck & Co., Inc.) 14.4 g and a dichroic dye (G-470, manufactured by Hayashibara Co., Ltd.) 0.58 g are dissolved in MIBK 35.0 g. Product (RM2) was prepared.

<Examples 1 to 6> and <Comparative Examples 1 to 2>
The alignment layer forming compositions of Examples 1 to 6 and Comparative Examples 1 to 2 were prepared with the compositions shown in Table 1. An alignment layer was formed using each alignment layer forming composition, and the dichroic ratio was measured for each alignment layer. Next, a polarizing element was formed using the polarizing layer forming composition. For each of the obtained polarizing elements, evaluation of orientation, polarization degree measurement, and dichroic ratio measurement were performed.

<Example 1>
[Formation of alignment layer]
A composition for forming an alignment layer shown in Table 1 was spin-coated on a quartz substrate, dried on a hot plate at 55 ° C. for 60 seconds, and then a coating film having a thickness of 200 nm was formed. Subsequently, 313 nm linearly polarized light was vertically irradiated on the coating surface through the polarizing plate with an exposure amount of ² mJ / cm ² . Subsequently, it heated at 170 degreeC for 5 minute (s) with the hotplate, and formed the alignment layer.

[Dichroic ratio measurement of alignment layer]
The dichroic ratio of the obtained alignment layer was measured as follows. The absorbance in the transmission axis direction (A1) and the absorbance in the absorption axis direction (A2) were measured using a device in which a folder with a polarizer was set in a spectrophotometer (Shimadzu Corporation UV-3600). The dichroic ratio was calculated from the measured absorbance (A1) in the transmission axis direction and absorbance (A2) in the absorption axis direction using the following formula. The measurement results are shown in Table 2.
Dichroic ratio = (A2) / (A1)

[Formation of polarizing layer]
On the obtained alignment layer, the polarizing layer forming composition RM1 was spin-coated at 2000 rpm · 30 sec and dried on a hot plate at 65 ° C. for 60 sec to form a coating film. Next, this coating film was exposed at 500 mJ / cm ² to obtain a polarizing element.

[Evaluation of orientation]
The orientation of the obtained polarizing element was confirmed by observation with a polarizing microscope. Samples were inserted in the directions of 0 ° and 45 ° between polarization microscope crossed Nicols, and observation of light leakage was performed. In the case of orientation, no light omission occurs at 0 °, and a dark field state is observed. At 45 °, light omission occurs and a bright field state is observed. When a dark field was obtained at 0 ° and a bright field at 45 °, “◯” was obtained, and when it was not obtained, “X” was given. These measurement results are shown in Table 2.

[Polarization measurement]
The polarization degree of the obtained polarizing element was measured as follows. The transmittance (T1) in the transmission axis direction and the transmittance (T2) in the absorption axis direction were measured using an apparatus in which a folder with a polarizer was set in a spectrophotometer (UV-3600 manufactured by Shimadzu Corporation). The degree of polarization was calculated from the measured transmission axis direction transmittance (T1) and absorption axis direction transmittance (T2) using the following equation. The measurement results are shown in Table 2.
Polarization degree (%) = {(T1−T2) / (T1 + T2)} ^1/2 × 100

[Dichroic ratio measurement of polarizing element]
The dichroic ratio of the obtained polarizing element was measured as follows. The absorbance in the transmission axis direction (A1) and the absorbance in the absorption axis direction (A2) were measured using a device in which a folder with a polarizer was set in a spectrophotometer (Shimadzu Corporation UV-3600). The dichroic ratio was calculated from the measured absorbance (A1) in the transmission axis direction and absorbance (A2) in the absorption axis direction using the following formula. The measurement results are shown in Table 2.
Dichroic ratio = (A2) / (A1)

<Example 2>
A polarizing element was produced in the same manner as in Example 1 except that the linearly polarized light at the time of forming the alignment layer was 5 mJ / cm ² and the heating temperature after the polarization exposure was 150 ° C. The results are summarized in Table 2.

<Example 3>
A polarizing element was prepared in the same manner as in Example 1 except that the heating temperature after the polarization exposure at the time of forming the alignment layer was 120 ° C. The results are summarized in Table 2.

<Example 4>
A polarizing element was prepared in the same manner as in Example 1 except that the heating temperature after polarized light exposure at the time of forming the alignment layer was 100 ° C. The results are summarized in Table 2.

<Example 5>
A polarizing element was prepared in the same manner as in Example 1 except that the heating temperature after the polarization exposure at the time of forming the alignment layer was 140 ° C. The results are summarized in Table 2.

<Example 6>
A polarizing element was produced in the same manner as in Example 1 except that the heating temperature after the polarization exposure at the time of forming the alignment layer was 100 ° C. and RM2 was used as the polarizing layer forming composition. The results are summarized in Table 2.

<Comparative Example 1>
A polarizing element was prepared in the same manner as in Example 1 except that the heating temperature after polarized light exposure at the time of forming the alignment layer was 100 ° C. The results are summarized in Table 2.

<Comparative example 2>
A polarizing element was produced in the same manner as in Example 1 except that the heating temperature after the polarization exposure at the time of forming the alignment layer was 100 ° C. and RM2 was used as the polarizing layer forming composition. The results are summarized in Table 2.

  In Comparative Examples 1 and 2 in which no dichroic dye was blended in the alignment layer, the dichroic ratio of the alignment layer was 0. On the other hand, in Examples 1 to 6 in which the dichroic dye was blended in the alignment layer, a high dichroic ratio was obtained, and it was possible to align the dichroic dye in the alignment layer.

  The polarizers obtained in Examples 1 to 5 were able to express a high degree of polarization and a dichroic ratio as compared with Comparative Example 1.

  The polarizer obtained in Example 6 was able to express a high degree of polarization and a dichroic ratio as compared with Comparative Example 2.

Claims (6)

(A) A polymer composition containing a photosensitive side-chain polymer that exhibits liquid crystallinity in a predetermined temperature range, (B) a dichroic dye, and an organic solvent. 2. The polymer composition according to claim 1, wherein the component (A) is a side chain polymer having a photosensitive side chain that causes photocrosslinking, photoisomerization, or photofleece transition. The polymer composition according to claim 1, wherein the component (A) is a side chain polymer having any one type of photosensitive side chain selected from the group consisting of the following formulas (1) to (6).

In the formula, A, B, and D are each independently a single bond, —O—, —CH ₂ —, —COO—, —OCO—, —CONH—, —NH—CO—, —CH═CH—CO—. Represents O— or —O—CO—CH═CH—;
S represents an alkylene group having 1 to 12 carbon atoms, and a hydrogen atom bonded thereto may be replaced by a halogen group;
T represents a single bond or an alkylene group having 1 to 12 carbon atoms, and the hydrogen atom bonded thereto may be replaced by a halogen group;
Y ₁ represents a ring selected from the group consisting of a monovalent benzene ring, naphthalene ring, biphenyl ring, furan ring, pyrrole ring and alicyclic hydrocarbon having 5 to 8 carbon atoms, or a substituent thereof. 2 to 6 rings selected from the same or different from each other are bonded to each other via a bonding group B, and the hydrogen atoms bonded thereto are independently —COOR ₀ (wherein R ₀ is a hydrogen atom) or an alkyl group having 1 to 5 carbon _{atoms), - NO 2, -CN,} -CH = C (CN) 2, -CH = CH-CN, a halogen group, an alkyl group having 1 to 5 carbon atoms, Or may be substituted with an alkyloxy group having 1 to 5 carbon atoms;
Y ₂ represents a group selected from the group consisting of a divalent benzene ring, naphthalene ring, biphenyl ring, furan ring, pyrrole ring, alicyclic hydrocarbon having 5 to 8 carbon atoms, and combinations thereof; The hydrogen atoms bonded thereto are each independently —NO ₂ , —CN, —CH═C (CN) ₂ , —CH═CH—CN, a halogen group, an alkyl group having 1 to 5 carbon atoms, or the number of carbon atoms. Optionally substituted with 1 to 5 alkyloxy groups;
R represents a hydroxy group, an alkoxy group having 1 to 6 carbon atoms, or the same definition as Y ₁ ;
X is a single bond, —COO—, —OCO—, —N═N—, —CH═CH—, —C≡C—, —CH═CH—CO—O—, or —O—CO—CH═. When CH is 2 and the number of X is 2, X may be the same or different;
Cou represents coumarin-6-yl group or a coumarin-7-yl group, _-NO 2 are each a hydrogen atom bonded to them _{independently, -CN, -CH = C (CN} ) 2, -CH = CH- May be substituted with CN, a halogen group, an alkyl group having 1 to 5 carbon atoms, or an alkyloxy group having 1 to 5 carbon atoms;
one of q1 and q2 is 1 and the other is 0;
q3 is 0 or 1;
P and Q are each independently selected from the group consisting of a divalent benzene ring, naphthalene ring, biphenyl ring, furan ring, pyrrole ring, alicyclic hydrocarbon having 5 to 8 carbon atoms, and combinations thereof. However, when X is —CH═CH—CO—O— or —O—CO—CH═CH—, P or Q on the side to which —CH═CH— is bonded represents an aromatic ring. ;
l1 is 0 or 1;
l2 is an integer from 0 to 2;
when l1 and l2 are both 0, A represents a single bond when T is a single bond;
when l1 is 1, B represents a single bond when T is a single bond;
H and I each independently represent a group selected from the group consisting of a divalent benzene ring, naphthalene ring, biphenyl ring, furan ring, pyrrole ring, and combinations thereof. The polymer composition according to any one of claims 1 to 3, wherein the component (A) has any one liquid crystalline side chain selected from the group consisting of the following formulas (21) to (31). object.

In which A, B, q1 and q2 have the same definition as above;
Y ₃ is a group selected from the group consisting of a monovalent benzene ring, naphthalene ring, biphenyl ring, furan ring, nitrogen-containing heterocycle, alicyclic hydrocarbon having 5 to 8 carbon atoms, and combinations thereof. And the hydrogen atom bonded thereto may be independently substituted with —NO ₂ , —CN, a halogen group, an alkyl group having 1 to 5 carbon atoms, or an alkyloxy group having 1 to 5 carbon atoms. ;
R ₃ is a hydrogen atom, —NO ₂ , —CN, —CH═C (CN) ₂ , —CH═CH—CN, halogen group, monovalent benzene ring, naphthalene ring, biphenyl ring, furan ring, nitrogen-containing A heterocyclic ring, an alicyclic hydrocarbon having 5 to 8 carbon atoms, an alkyl group having 1 to 12 carbon atoms, or an alkoxy group having 1 to 12 carbon atoms;
l represents an integer of 1 to 12, m represents an integer of 0 to 2, provided that in formulas (25) to (26), the sum of all m is 2 or more, and formulas (27) to (28 ), The sum of all m is 1 or more, and m1, m2 and m3 each independently represents an integer of 1 to 3;
R ₂ represents a hydrogen atom, —NO ₂ , —CN, a halogen group, a monovalent benzene ring, a naphthalene ring, a biphenyl ring, a furan ring, a nitrogen-containing heterocyclic ring, and an alicyclic hydrocarbon having 5 to 8 carbon atoms. And represents an alkyl group or an alkyloxy group;
Z ₁ and Z _{2 each} represents a single bond, —CO—, —CH ₂ O—, —CH═N—, or —CF ₂ —. (C) As a component, the compound represented by following formula (c) is contained, The polymer composition as described in any one of Claims 1-4 characterized by the above-mentioned.

(In the formula, any three to five of R ¹⁰¹ , R ¹⁰² , R ¹⁰³ , R ¹⁰⁴ and R ¹⁰⁵ are each independently a hydrogen atom, a halogen atom, C ₁ -C ₆ alkyl, C ₁ -C _6. Haloalkyl, C ₁ -C ₆ alkoxy, C ₁ -C ₆ haloalkoxy, C ₃ -C ₈ cycloalkyl, C ₃ -C ₈ halocycloalkyl, C ₂ -C ₆ alkenyl, C ₂ -C ₆ haloalkenyl, C ₃ -C _{8 cycloalkenyl,} C 3 -C ₈ halocycloalkyl _{cycloalkenyl,} C 2 -C _{6 alkynyl,} C 2 -C _{6 haloalkynyl, (C} 1 ~C ₆ alkyl) _{carbonyl, (C} 1 ~C ₆ haloalkyl) carbonyl , (C ₁ -C ₆ alkoxy) carbonyl, (C ₁ -C ₆ haloalkoxy) carbonyl, (C ₁ -C ₆ alkylamino) carbonyl, (C _1- C ₆ haloalkyl) aminocarbonyl, di (C ₁ -C ₆ alkyl) aminocarbonyl, a substituent selected from the group consisting of cyano and nitro, and any of R ¹⁰¹ , R ¹⁰² , R ¹⁰³ , R ¹⁰⁴ and R ¹⁰⁵ When three to four are defined as above, one or two of R ¹⁰¹ , R ¹⁰² , R ¹⁰³ , R ¹⁰⁴ and R ¹⁰⁵ are represented by the following formula (c-2):

(In the formula (c-2), a broken line represents a bond, and R ¹⁰⁶ represents an alkylene group having 1 to 30 carbon atoms, phenylene, a divalent carbocyclic or heterocyclic ring, and the alkylene group, phenylene or divalent. One or a plurality of hydrogen atoms in the carbocycle or heterocycle may be replaced with a fluorine atom or an organic group, and —CH ₂ CH ₂ — in R ¹⁰⁶ is replaced with —CH═CH—. -CH _2-in R ¹⁰⁶ may be replaced by phenylene or a divalent carbocyclic or heterocyclic ring, and when any of the following groups is not adjacent to each other: , may be substituted with these groups; -O -, - NHCO -, - CONH -, - COO -, - OCO -, - NH -, - NHCONH -, - CO-.R 107 water Represents a prime atom or a methyl group.), And n represents 0 or 1. ) An alignment layer forming composition containing the polymer composition according to any one of claims 1 to 5.