JP2009062513A - Polymerizable liquid crystal composition - Google Patents
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- JP2009062513A JP2009062513A JP2008146744A JP2008146744A JP2009062513A JP 2009062513 A JP2009062513 A JP 2009062513A JP 2008146744 A JP2008146744 A JP 2008146744A JP 2008146744 A JP2008146744 A JP 2008146744A JP 2009062513 A JP2009062513 A JP 2009062513A
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- Liquid Crystal Substances (AREA)
- Polymerisation Methods In General (AREA)
Abstract
Description
本願発明は、液晶ディスプレイ等の光学補償に用いられる光学異方体の構成部材として有用な重合性液晶組成物及び当該組成物の重合体により構成される光学異方体に関する。 The present invention relates to a polymerizable liquid crystal composition useful as a constituent member of an optical anisotropic body used for optical compensation of a liquid crystal display or the like, and an optical anisotropic body composed of a polymer of the composition.
重合性液晶組成物は光学異方体の構成部材として有用であり、光学異方体は例えば位相差フィルムとして種々の液晶ディスプレイに応用されている。位相差フィルムは、重合性液晶組成物を基板に塗布して、配向膜等により重合性液晶組成物を配向させた状態で活性エネルギー線を照射して重合性液晶組成物を硬化することにより得られる。しかし、重合性液晶組成物を基板に塗布した場合、空気界面においてある程度のチルト角を有し、ある特定の位相差フィルムに要求される光学特性を満たすためには該チルト角を減じることが求められていた。ここで空気界面におけるチルト角とは、棒状重合性液晶の場合、空気界面に存在する重合性液晶分子の長軸が基板面となす角を表し、基板面と平行になる場合を0°として定義し、円盤状重合性液晶の場合、円盤面が基板面となす角を表し、基板面と平行になる場合を0°として定義する。 The polymerizable liquid crystal composition is useful as a constituent member of an optical anisotropic body, and the optical anisotropic body is applied to various liquid crystal displays as a retardation film, for example. The retardation film is obtained by applying a polymerizable liquid crystal composition to a substrate and curing the polymerizable liquid crystal composition by irradiating active energy rays in a state where the polymerizable liquid crystal composition is aligned by an alignment film or the like. It is done. However, when a polymerizable liquid crystal composition is applied to a substrate, it has a certain tilt angle at the air interface, and it is required to reduce the tilt angle in order to satisfy the optical characteristics required for a specific retardation film. It was done. Here, the tilt angle at the air interface means, in the case of rod-like polymerizable liquid crystal, the angle formed by the major axis of the polymerizable liquid crystal molecules present at the air interface with the substrate surface, and is defined as 0 ° when parallel to the substrate surface. In the case of a discotic polymerizable liquid crystal, the angle formed by the disc surface and the substrate surface is defined, and the case where the disc surface is parallel to the substrate surface is defined as 0 °.
該チルト角を減じる方法として、界面活性剤や重合可能な界面活性剤を重合性液晶組成物中に添加する方法が提案されている(特許文献1、2及び3参照)。
一方、薄型・軽量化やコスト低減を目的として、液晶ディスプレイの液晶セル内に位相差フィルムを組み込む方式が注目されているが、この場合、当該フィルム中の不純物が液晶に対して悪影響を及ぼし易い問題がある。
As a method of reducing the tilt angle, a method of adding a surfactant or a polymerizable surfactant to the polymerizable liquid crystal composition has been proposed (see Patent Documents 1, 2, and 3).
On the other hand, a method of incorporating a retardation film in a liquid crystal cell of a liquid crystal display has been attracting attention for the purpose of reducing the thickness and weight and reducing the cost. In this case, impurities in the film tend to adversely affect the liquid crystal. There's a problem.
重合性液晶組成物に界面活性剤を含有させた場合、チルト角を減じる目的は達成できる。しかしながら、位相差フィルムを液晶セル内に組み込んだ場合、界面活性剤は化学構造上、極性が高い部分を有していることから界面活性剤の混入により液晶の電圧保持率を低下させてしまう問題があった。更に、界面活性剤の有する非粘着性や撥水・撥油性から積層膜の形成が困難である。更に、界面活性剤として長鎖パーフルオロアルキルスルホン酸アミド誘導体を用いた場合(特許文献3参照)には当該化合物は環境毒性の点で懸念があることから液晶ディスプレイとしての応用には問題があった。
以上のように、液晶ディスプレイの電圧保持率を悪化させず、積層膜の形成が容易であり、光学異方体を作製した場合に表面のチルト角を容易に減じることができる重合性液晶組成物の開発が求められていた。
When a polymerizable liquid crystal composition contains a surfactant, the purpose of reducing the tilt angle can be achieved. However, when a retardation film is incorporated in a liquid crystal cell, the surfactant has a portion with high polarity due to its chemical structure, so that the voltage holding ratio of the liquid crystal is lowered due to the incorporation of the surfactant. was there. Furthermore, it is difficult to form a laminated film because of the non-adhesiveness and water / oil repellency of the surfactant. Furthermore, when a long-chain perfluoroalkyl sulfonic acid amide derivative is used as a surfactant (see Patent Document 3), there is a problem in application as a liquid crystal display because the compound has a concern in terms of environmental toxicity. It was.
As described above, a polymerizable liquid crystal composition that does not deteriorate the voltage holding ratio of a liquid crystal display, can easily form a laminated film, and can easily reduce the tilt angle of the surface when an optical anisotropic body is produced. The development of was demanded.
本願発明の目的は、重合性液晶組成物を基板に塗布した場合、空気界面におけるチルト角を減じる効果を有し、重合性液晶組成物の硬化物である光学異方体が液晶セル内に組み込まれた場合において液晶ディスプレイの電圧保持率を悪化させることが無く、かつ、積層膜の形成が容易である重合性液晶組成物を提供することにある。 The object of the present invention is to reduce the tilt angle at the air interface when a polymerizable liquid crystal composition is applied to a substrate, and an optical anisotropic body, which is a cured product of the polymerizable liquid crystal composition, is incorporated in a liquid crystal cell. In such a case, it is an object of the present invention to provide a polymerizable liquid crystal composition that does not deteriorate the voltage holding ratio of a liquid crystal display and can easily form a laminated film.
上記目的を達成するために鋭意検討した結果、重合性液晶組成物に添加することにより界面のチルト角を効果的に減じる化合物を見出し本願発明の完成に至った。本願発明は、一般式(I) As a result of diligent studies to achieve the above object, a compound that effectively reduces the tilt angle of the interface when added to the polymerizable liquid crystal composition has been found and the present invention has been completed. The present invention relates to the general formula (I)
(式中、R1、R2、R3及びR4はそれぞれ独立的に水素原子、ハロゲン原子又は基中の水素原子がハロゲン原子で置換されていても良い炭素原子数1〜20の炭化水素基を表すが、R1、R2、R3及びR4のうち少なくとも1つはフッ素原子又は基中の1つ以上の水素原子がフッ素原子で置換された炭素原子数1〜20の炭化水素基を表す。)で表される繰り返し単位を有する重量平均分子量が100以上である化合物を含有することを特徴とする重合性液晶組成物及び当該組成物の重合体より構成される光学異方体を提供する。 (Wherein R 1 , R 2 , R 3 and R 4 are each independently a hydrogen atom, a halogen atom or a hydrocarbon having 1 to 20 carbon atoms in which a hydrogen atom in the group may be substituted with a halogen atom) Represents a group, and at least one of R 1 , R 2 , R 3 and R 4 is a fluorine atom or a hydrocarbon having 1 to 20 carbon atoms in which one or more hydrogen atoms in the group are substituted with a fluorine atom An optically anisotropic body composed of a polymerizable liquid crystal composition comprising a compound having a repeating unit represented by formula (1) and a weight average molecular weight of 100 or more and a polymer of the composition I will provide a.
本願発明の重合性液晶組成物は、空気界面におけるチルト角を減じる効果を有することから空気界面において水平配向となる光学異方体の材料として有用であり、界面活性剤等の極性物質を含有しないため液晶ディスプレイの電圧保持率を悪化させることが無く、積層膜の形成が容易であるといった優れた特徴を有する。よって本願発明の重合性液晶組成物は、特に液晶セル内部に組み込む光学異方体の材料として好適に使用でき、かつ、環境毒性の心配がない。 The polymerizable liquid crystal composition of the present invention has an effect of reducing the tilt angle at the air interface, and thus is useful as a material for an optical anisotropic body that is horizontally aligned at the air interface, and does not contain a polar substance such as a surfactant. Therefore, the liquid crystal display has excellent characteristics such that the voltage holding ratio of the liquid crystal display is not deteriorated and the laminated film can be easily formed. Therefore, the polymerizable liquid crystal composition of the present invention can be suitably used particularly as an optical anisotropic material incorporated into the liquid crystal cell, and there is no concern about environmental toxicity.
以下に本願発明による重合性液晶組成物の最良の形態について説明する。本願発明の重合性液晶組成物は、一般式(I)で表される繰り返し単位を有する重量平均分子量が100以上である化合物を含有するが、重合性液晶組成物中に該化合物が溶解している状態又は分散している状態でも良く、更に、固体が析出している状態であっても、析出した固体が液晶材料としての特性を損なわない程度の粒子径以下の微粒子であれば良いが、溶解している状態又は分散している状態が好ましい。 The best mode of the polymerizable liquid crystal composition according to the present invention will be described below. The polymerizable liquid crystal composition of the present invention contains a compound having a repeating unit represented by the general formula (I) and a weight average molecular weight of 100 or more, and the compound is dissolved in the polymerizable liquid crystal composition. It may be in a state of being dispersed or dispersed, and even in a state where a solid is precipitated, the precipitated solid may be fine particles having a particle diameter or less that does not impair the properties as a liquid crystal material, A dissolved state or a dispersed state is preferable.
一般式(I)で表される繰り返し単位を有する化合物のうち、好適な構造として、式(I-a)〜式(I-f) Among the compounds having a repeating unit represented by the general formula (I), as a preferred structure, the formula (I-a) to the formula (I-f)
(上記式(I-e)において記載される二つの構造式は、同一分子中に二つの繰り返し単位を有することを意味する。)で表される繰り返し単位を有する化合物が挙げられる。中でも、式(I-a)〜式(I-e)で表される構造がより好ましく、式(I-a)及び式(I-c)で表される構造が特に好ましい。又、式(I-a)〜式(I-f)で表される繰り返し単位を有する化合物を2種以上共重合させた共重合体も好ましい。この場合、式(I-a)及び式(I-b)を有する共重合体、式(I-a)及び式(I-c)を有する共重合体、式(I-a)及び式(I-f)を有する共重合体、及び、式(I-a)、(I-b)及び式(I-f)を有する共重合体がより好ましく、式(I-a)及び式(I-b)を有する共重合体、及び、式(I-a)、(I-b)及び式(I-f)を有する共重合体が特に好ましい。 (Two structural formulas described in the above formula (I-e) mean having two repeating units in the same molecule.) And a compound having a repeating unit represented by the formula (I-e). Among these, structures represented by the formulas (Ia) to (Ie) are more preferable, and structures represented by the formulas (Ia) and (Ic) are particularly preferable. A copolymer obtained by copolymerizing two or more compounds having a repeating unit represented by the formula (Ia) to the formula (If) is also preferable. In this case, a copolymer having the formula (Ia) and the formula (Ib), a copolymer having the formula (Ia) and the formula (Ic), a copolymer having the formula (Ia) and the formula (If), and More preferred are copolymers having formula (Ia), (Ib) and formula (If), copolymers having formula (Ia) and formula (Ib), and formulas (Ia), (Ib) and formula ( A copolymer having If) is particularly preferred.
該化合物の重量平均分子量は、小さすぎるとチルト角を減じる効果が乏しくなり、大きすぎると配向が長時間安定しないため最適な範囲が存在する。具体的には、200〜1000000であることが好ましく、300〜100000であることがさらに好ましく、400〜80000であることが特に好ましい。 If the weight average molecular weight of the compound is too small, the effect of reducing the tilt angle is poor. If the weight average molecular weight is too large, the orientation is not stable for a long time, so there is an optimum range. Specifically, it is preferably 200 to 1000000, more preferably 300 to 100000, and particularly preferably 400 to 80000.
又、該化合物を、重合性液晶組成物中に0.01〜5質量%含有することが好ましく、0.05〜2質量%含有することがより好ましく、0.1〜1質量%含有することが特に好ましい。
重合性液晶組成物中に含有する重合性液晶化合物については、特に制限はなく使用することができる。重合性液晶化合物として棒状重合性液晶化合物又は円盤状重合性液晶化合物を使用することが好ましく、棒状重合性液晶化合物が特に好ましい。
棒状重合性液晶化合物は、一般式(II)
Moreover, it is preferable to contain 0.01-5 mass% of this compound in a polymeric liquid crystal composition, It is more preferable to contain 0.05-2 mass%, Containing 0.1-1 mass% Is particularly preferred.
The polymerizable liquid crystal compound contained in the polymerizable liquid crystal composition is not particularly limited and can be used. As the polymerizable liquid crystal compound, a rod-like polymerizable liquid crystal compound or a disk-like polymerizable liquid crystal compound is preferably used, and a rod-like polymerizable liquid crystal compound is particularly preferred.
The rod-like polymerizable liquid crystal compound has the general formula (II)
(式中、Pは反応性官能基を表し、Spは炭素原子数1〜20のスペーサー基を表し、mは0又は1を表し、MGはメソゲン基又はメソゲン性支持基を表し、R1は、ハロゲン原子、シアノ基又は炭素原子数1〜25のアルキル基を表すが、該アルキル基は1つ以上のハロゲン原子又はCNにより置換されていても良く、この基中に存在する1つのCH2基又は隣接していない2つ以上のCH2基はそれぞれ相互に独立して、酸素原子が相互に直接結合しない形で、-O-、-S-、-NH-、-N(CH3)-、-CO-、-COO-、-OCO-、-OCOO-、-SCO-、-COS-又は-C≡C-により置き換えられていても良く、あるいはR1は一般式(II-a) (Wherein P represents a reactive functional group, Sp represents a spacer group having 1 to 20 carbon atoms, m represents 0 or 1, MG represents a mesogenic group or a mesogenic support group, and R 1 represents Represents a halogen atom, a cyano group or an alkyl group having 1 to 25 carbon atoms, and the alkyl group may be substituted by one or more halogen atoms or CN, and one CH 2 present in the group. Group or two or more non-adjacent CH 2 groups are each independently of each other such that —O—, —S—, —NH—, —N (CH 3 ) -, -CO-, -COO-, -OCO-, -OCOO-, -SCO-, -COS- or -C≡C- may be substituted, or R 1 may have the general formula (II-a)
(式中、Pは反応性官能基を表し、Spは炭素原子数1〜20のスペーサー基を表し、mは0又は1を表す。)で表される構造を表す。)で表される化合物を含有することが好ましく、一般式(II)において、Spがアルキレン基を表し、(該アルキレン基は1つ以上のハロゲン原子又はCNにより置換されていても良く、この基中に存在する1つのCH2基又は隣接していない2つ以上のCH2基はそれぞれ相互に独立して、酸素原子が相互に直接結合しない形で、-O-、-S-、-NH-、-N(CH3)-、-CO-、-COO-、-OCO-、-OCOO-、-SCO-、-COS-又は-C≡C-により置き換えられていても良い。)MGが一般式(II-b) (Wherein P represents a reactive functional group, Sp represents a spacer group having 1 to 20 carbon atoms, and m represents 0 or 1). In general formula (II), Sp represents an alkylene group, which may be substituted with one or more halogen atoms or CN. independently one CH 2 group or adjacent to each other each of the two or more CH 2 groups not present in the form in which the oxygen atoms are not directly bonded to one another, -O -, - S -, - NH -, -N (CH 3 )-, -CO-, -COO-, -OCO-, -OCOO-, -SCO-, -COS- or -C≡C- may be substituted.) General formula (II-b)
(式中、A1、A2及びA3はそれぞれ独立的に、1,4-フェニレン基、1,4-シクロヘキシレン基、1,4-シクロヘキセニル基、テトラヒドロピラン-2,5-ジイル基、1,3-ジオキサン-2,5-ジイル基、テトラヒドロチオピラン-2,5-ジイル基、1,4-ビシクロ(2,2,2)オクチレン基、デカヒドロナフタレン-2,6-ジイル基、ピリジン-2,5-ジイル基、ピリミジン-2,5-ジイル基、ピラジン-2,5-ジイル基、1,2,3,4-テトラヒドロナフタレン-2,6-ジイル基、2,6-ナフチレン基、フェナントレン-2,7-ジイル基、9,10-ジヒドロフェナントレン-2,7-ジイル基、1,2,3,4,4a,9,10a-オクタヒドロフェナントレン2,7-ジイル基又はフルオレン2,7-ジイル基を表し、該1,4-フェニレン基、1,2,3,4-テトラヒドロナフタレン-2,6-ジイル基、2,6-ナフチレン基、フェナントレン-2,7-ジイル基、9,10-ジヒドロフェナントレン-2,7-ジイル基、1,2,3,4,4a,9,10a-オクタヒドロフェナントレン2,7-ジイル基及びフルオレン2,7-ジイル基は置換基として1個以上のF、Cl、CF3、OCF3、シアノ基、炭素原子数1〜8のアルキル基、アルコキシ基、アルカノイル基、アルカノイルオキシ基、炭素原子数2〜8のアルケニル基、アルケニルオキシ基、アルケノイル基又はアルケノイルオキシ基を有していても良く、Z0、Z1、Z2及びZ3はそれぞれ独立して、-COO-、-OCO-、-CH2 CH2-、-OCH2-、-CH2O-、-CH=CH-、-C≡C-、-CH=CHCOO-、-OCOCH=CH-、-CH2CH2COO-、-CH2CH2OCO-、-COO CH2CH2-、-OCOCH2CH2-、-CONH-、-NHCO-又は単結合を表し、nは0、1又は2を表す。)で表される構造を表し、Pが一般式(II-c)、一般式(II-d)及び一般式(II-e) (In the formula, A1, A2 and A3 are each independently 1,4-phenylene group, 1,4-cyclohexylene group, 1,4-cyclohexenyl group, tetrahydropyran-2,5-diyl group, 1, 3-dioxane-2,5-diyl group, tetrahydrothiopyran-2,5-diyl group, 1,4-bicyclo (2,2,2) octylene group, decahydronaphthalene-2,6-diyl group, pyridine- 2,5-diyl group, pyrimidine-2,5-diyl group, pyrazine-2,5-diyl group, 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, 2,6-naphthylene group, Phenanthrene-2,7-diyl group, 9,10-dihydrophenanthrene-2,7-diyl group, 1,2,3,4,4a, 9,10a-octahydrophenanthrene 2,7-diyl group or fluorene 2, Represents a 7-diyl group, the 1,4-phenylene group, 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, 2,6-naphthylene group, phenanthrene-2,7-diyl group, 9 , 10-Dihydrophenanthrene-2,7-diyl group 1,2,3,4,4a, 9,10a- octahydrophenanthrene 2,7-diyl group and fluorene 2,7-diyl group is 1 or more F as substituents, Cl, CF 3, OCF 3 , cyano Group, an alkyl group having 1 to 8 carbon atoms, an alkoxy group, an alkanoyl group, an alkanoyloxy group, an alkenyl group having 2 to 8 carbon atoms, an alkenyloxy group, an alkenoyl group or an alkenoyloxy group. , Z0, Z1, Z2 and Z3 are each independently -COO-, -OCO-, -CH 2 CH 2- , -OCH 2- , -CH 2 O-, -CH = CH-, -C≡C -, -CH = CHCOO-, -OCOCH = CH-, -CH 2 CH 2 COO-, -CH 2 CH 2 OCO-, -COO CH 2 CH 2- , -OCOCH 2 CH 2- , -CONH-,- NHCO- or a single bond, n represents 0, 1 or 2), and P represents a general formula (II-c), general formula (II-d) and general formula (II- e)
(式中、R21、R22、R23、R31、R32、R33、R41、R42及びR43はそれぞれ独立的に水素原子、ハロゲン原子又は炭素原子数1〜5のアルキル基を表し、nは0又は1を表す。)で表される置換基からなる群より選ばれる置換基で表される化合物を含有することがさらに好ましい。
ここで、重合性液晶組成物に含有される化合物として、より具体的には一般式(III)
(In the formula, R 21 , R 22 , R 23 , R 31 , R 32 , R 33 , R 41 , R 42 and R 43 are each independently a hydrogen atom, a halogen atom or an alkyl group having 1 to 5 carbon atoms. And n represents 0 or 1. It is more preferable to contain a compound represented by a substituent selected from the group consisting of substituents represented by:
Here, the compound contained in the polymerizable liquid crystal composition is more specifically represented by the general formula (III)
(式中、mは0又は1を表し、W1及びW2はそれぞれ独立的に単結合、-O-、-COO-又は-OCO-を表し、Y1及びY2はそれぞれ独立的に-COO-又は-OCO-を表し、r及びsはそれぞれ独立的に2〜18の整数を表すが、式中に存在する1,4−フェニレン基は炭素原子数1〜7のアルキル基、アルコキシ基、アルカノイル基、シアノ基、又はハロゲン原子で一つ以上置換されていても良い。)で表される化合物を用いると、機械的強度や耐熱性に優れた光学異方体が得られるので好ましい。
又、一般式(IV)
Wherein m represents 0 or 1, W 1 and W 2 each independently represent a single bond, —O—, —COO— or —OCO—, and Y 1 and Y 2 each independently represent — COO- or -OCO- is represented, and r and s each independently represent an integer of 2 to 18, the 1,4-phenylene group present in the formula is an alkyl group or alkoxy group having 1 to 7 carbon atoms , An alkanoyl group, a cyano group, or a halogen atom may be substituted, which is preferable because an optically anisotropic body excellent in mechanical strength and heat resistance can be obtained.
In addition, general formula (IV)
(式中、Z1は水素原子、ハロゲン原子、シアノ基又は炭素原子数1〜20の炭化水素基を表し、Z2は水素原子又はメチル基を表し、tは0又は1を表し、A、B及びCはそれぞれ独立的に、1,4−フェニレン基、隣接しないCH基が窒素で置換された1,4−フェニレン基、1,4−シクロヘキシレン基、1つ又は隣接しない2つのCH2基が酸素又は硫黄原子で置換された1,4−シクロヘキシレン基、1,4−シクロヘキセニレン基を表すが、式中に存在する1,4−フェニレン基は炭素原子数1〜7のアルキル基、アルコキシ基、アルカノイル基、シアノ基又はハロゲン原子で一つ以上置換されていても良く、Y3及びY4はそれぞれ独立的に単結合、-CH2CH2-、-CH2O-、-OCH2-、-COO-、-OCO-、-C≡C-、-CH=CH-、-CF=CF-、-(CH2)4-、-CH2CH2CH2O-、-OCH2CH2CH2-、-CH=CHCH2CH2-、-CH2CH2CH=CH-、-CH=CHCOO-、-OCOCH=CH-、-CH2CH2COO-、-CH2CH2OCO-、-COO CH2CH2-又は-OCOCH2CH2-を表し、Y5は単結合、-O-、-COO-、-OCO-又は-CH=CHCOO-を表す。)で表される化合物を用いると、重合性液晶組成物の粘度低減や液晶温度範囲を室温もしくは室温付近まで低減することができるので好ましい。
又、一般式(V)
(In the formula, Z 1 represents a hydrogen atom, a halogen atom, a cyano group or a hydrocarbon group having 1 to 20 carbon atoms, Z 2 represents a hydrogen atom or a methyl group, t represents 0 or 1, A, B and C are each independently a 1,4-phenylene group, a 1,4-phenylene group in which a non-adjacent CH group is substituted with nitrogen, a 1,4-cyclohexylene group, one or two non-adjacent CH 2 Represents a 1,4-cyclohexylene group or 1,4-cyclohexenylene group in which the group is substituted with an oxygen or sulfur atom, and the 1,4-phenylene group present in the formula is an alkyl having 1 to 7 carbon atoms Group, an alkoxy group, an alkanoyl group, a cyano group or a halogen atom, and Y 3 and Y 4 are each independently a single bond, —CH 2 CH 2 —, —CH 2 O—, -OCH 2 -, - COO -, - OCO -, - C≡C -, - CH = CH -, - CF = CF -, - (CH 2) 4 -, - CH 2 CH 2 CH 2 O -, - OCH 2 CH 2 CH 2- , -CH = CHCH 2 CH 2- , -CH 2 CH 2 CH = CH -, - CH = CHCOO -, - OCOCH = CH -, - CH 2 CH 2 COO -, - CH 2 CH 2 OCO -, - COO CH 2 CH 2 - or -OCOCH 2 CH 2 - and Y 5 represents a single bond, —O—, —COO—, —OCO—, or —CH═CHCOO—)), the viscosity of the polymerizable liquid crystal composition can be reduced and the liquid crystal temperature range can be reduced. Is preferable because it can be reduced to room temperature or near room temperature.
General formula (V)
(式中、Z3は水素原子、ハロゲン原子、シアノ基、炭素原子1〜20の炭化水素基を表し、Z4は水素原子又はメチル基を表し、W3はそれぞれ独立的に単結合、-O-、-COO-、-OCO-を表し、vは2〜18の整数を表し、uは0又は1の整数を表し、D、E及びFはそれぞれ独立的に、1,4-フェニレン基、隣接しないCH基が窒素で置換された1,4-フェニレン基、1,4-シクロヘキシレン基、1つ又は隣接しない2つのCH2基が酸素又は硫黄原子で置換された1,4−シクロヘキシレン基、1,4−シクロヘキセニレン基を表し、これらのD、E及びFは、さらに炭素原子数1〜7のアルキル基、アルコキシ基、アルカノイル基、シアノ基、又はハロゲン原子で一つ以上置換されていても良く、Y6及びY7はそれぞれ独立的に単結合、-CH2CH2-、-CH2O-、-OCH2-、-COO-、-OCO-、-C≡C-、-CH=CH-、-CF=CF-、-(CH2)4-、-CH2CH2CH2O-、-OCH2CH2CH2-、-CH=CHCH2CH2-、-CH2CH2CH=CH-、-CH=CHCOO-、-OCOCH=CH-、-CH2CH2COO-、-CH2CH2OCO-、-COOCH2CH2-又は-OCOCH2CH2-を表し、Y8は単結合、-O-、-COO-、-OCO-又は-CH=CHCOO-を表す。)で表される化合物を用いると、重合性液晶組成物の粘度を大幅に増加させることなく液晶物性を調節することができるので好ましい。
一般式(II)で表される化合物の具体例を以下に挙げることができる。
(In the formula, Z 3 represents a hydrogen atom, a halogen atom, a cyano group, a hydrocarbon group having 1 to 20 carbon atoms, Z 4 represents a hydrogen atom or a methyl group, and W 3 each independently represents a single bond,- O—, —COO—, —OCO—, v represents an integer of 2 to 18, u represents an integer of 0 or 1, and D, E, and F are each independently a 1,4-phenylene group. 1,4-phenylene group in which non-adjacent CH groups are substituted with nitrogen, 1,4-cyclohexylene group, 1,4-cyclohexene group in which one or two non-adjacent CH 2 groups are substituted with oxygen or sulfur atoms Represents a silene group or a 1,4-cyclohexenylene group, and these D, E, and F are one or more alkyl groups, alkoxy groups, alkanoyl groups, cyano groups, or halogen atoms having 1 to 7 carbon atoms. Y 6 and Y 7 may each independently be a single bond, —CH 2 CH 2 —, —CH 2 O—, —OCH 2 —, —COO—, —OCO—, —C≡C -, -CH = C H -, - CF = CF - , - (CH 2) 4 -, - CH 2 CH 2 CH 2 O -, - OCH 2 CH 2 CH 2 -, - CH = CHCH 2 CH 2 -, - CH 2 CH 2 CH = CH -, - CH = CHCOO -, - OCOCH = CH -, - CH 2 CH 2 COO -, - CH 2 CH 2 OCO -, - COOCH 2 CH 2 - or -OCOCH 2 CH 2 -, Y represents 8 represents a single bond, —O—, —COO—, —OCO—, or —CH═CHCOO—.) When the compound represented by It is preferable because the physical properties can be adjusted.
Specific examples of the compound represented by the general formula (II) can be given below.
(式中、j、k、l及びmはそれぞれ独立的に2〜18の整数を表す。)
又、一般式(III)で表される化合物の具体例を以下に挙げることができる。
(Wherein j, k, l and m each independently represent an integer of 2 to 18)
Specific examples of the compound represented by the general formula (III) can be given below.
(式中、j及びkはそれぞれ独立的に2〜18の整数を表す。)
又、一般式(IV)で表される化合物の具体的な例として、化合物の構造と相転移温度を以下に挙げることができる。
(Wherein j and k each independently represents an integer of 2 to 18)
Specific examples of the compound represented by the general formula (IV) include the structure of the compound and the phase transition temperature.
(式中、シクロヘキサン環はトランスシクロヘキサン環を表し、数字は相転移温度を表し、Cは結晶相、Nはネマチック相、Sはスメクチック相、Iは等方性液体相をそれぞれ表す。)
又、一般式(V)で表される化合物の具体例を以下に挙げることができる。
(In the formula, a cyclohexane ring represents a transcyclohexane ring, a number represents a phase transition temperature, C represents a crystalline phase, N represents a nematic phase, S represents a smectic phase, and I represents an isotropic liquid phase.)
Specific examples of the compound represented by the general formula (V) can be given below.
(式中、X1は水素原子又はメチル基を表し、Rは炭素原子数1から20のアルキル基表す。)
又、円盤状液晶化合物は、ベンゼン誘導体、トリフェニレン誘導体、トルキセン誘導体、フタロシアニン誘導体又はシクロヘキサン誘導体を分子の中心の母核とし、直鎖のアルキル基、直鎖のアルコキシ基又は置換ベンゾイルオキシ基がその側鎖として放射状に置換した構造を有することが好ましく、一般式(VI)
(In the formula, X 1 represents a hydrogen atom or a methyl group, and R represents an alkyl group having 1 to 20 carbon atoms.)
The discotic liquid crystal compound has a benzene derivative, a triphenylene derivative, a truxene derivative, a phthalocyanine derivative or a cyclohexane derivative as a mother nucleus at the center of the molecule, and a linear alkyl group, a linear alkoxy group, or a substituted benzoyloxy group on its side. It preferably has a structure that is radially substituted as a chain.
(式中、R5はそれぞれ独立して一般式(VI-a)で表される置換基を表す。) (In the formula, each R 5 independently represents a substituent represented by the general formula (VI-a).)
(式中、R6及びR7はそれぞれ独立的に水素原子、ハロゲン原子又はメチル基を表し、R8は炭素原子数1〜20アルコキシ基を表すが、該アルコキシ基中の水素原子は一般式(VI-b)、一般式(VI-c)又は一般式(VI-d)で表される置換基によって置換されていても良い。) (In the formula, R 6 and R 7 each independently represent a hydrogen atom, a halogen atom or a methyl group, and R 8 represents an alkoxy group having 1 to 20 carbon atoms, and the hydrogen atom in the alkoxy group represents a general formula. (It may be substituted with a substituent represented by (VI-b), general formula (VI-c) or general formula (VI-d))
(式中、R81、R82、R83、R84、R85、R86、R87、R88及びR89はそれぞれ独立的に水素原子、ハロゲン原子又は炭素原子数1〜5のアルキル基を表し、nは0又は1を表す。)で表される構造を有することがさらに好ましく、一般式(VI)においてR8の内少なくとも一つは一般式(VI-b)、一般式(VI-c)又は一般式(VI-d)で表される置換基によって置換されたアルコキシ基を表すことが好ましく、R8の全てが一般式(VI-b)、一般式(VI-c)又は一般式(VI-d)で表される置換基によって置換されたアルコキシ基を表すことが特に好ましい。
さらに、一般式(VI-a)は具体的には一般式(VI-e)
Wherein R 81 , R 82 , R 83 , R 84 , R 85 , R 86 , R 87 , R 88 and R 89 are each independently a hydrogen atom, a halogen atom or an alkyl group having 1 to 5 carbon atoms. And n represents 0 or 1). In general formula (VI), at least one of R 8 is represented by general formula (VI-b) or general formula (VI -c) or an alkoxy group substituted by a substituent represented by the general formula (VI-d), preferably all of R 8 are represented by the general formula (VI-b), the general formula (VI-c) or It is particularly preferable to represent an alkoxy group substituted by a substituent represented by the general formula (VI-d).
Furthermore, the general formula (VI-a) specifically represents the general formula (VI-e)
以上述べた重合性液晶組成物は有機溶媒などに溶かした溶液の状態で使用してもよい。好適な有機溶媒として例えばトルエン、キシレン、クメンなどのアルキル置換ベンゼンやプロピレングリコールモノメチルエーテルアセテート、酢酸ブチル、シクロヘキサノン等を挙げることができる。さらにこれらの溶媒にジメチルホルムアミド、γ−ブチロラクトン、N-メチルピロリジノン、メチルエチルケトン、酢酸エチル等を添加しても良い。
又、以上の重合性液晶組成物中に一般式(I)で表される繰り返し単位を有する重量平均分子量が100以上である化合物の他に重合禁止剤、重合開始剤、酸化防止剤、又は紫外線吸収剤などの添加剤を含有しても良い。
The polymerizable liquid crystal composition described above may be used in the form of a solution dissolved in an organic solvent or the like. Suitable organic solvents include, for example, alkyl-substituted benzenes such as toluene, xylene and cumene, propylene glycol monomethyl ether acetate, butyl acetate and cyclohexanone. Further, dimethylformamide, γ-butyrolactone, N-methylpyrrolidinone, methyl ethyl ketone, ethyl acetate and the like may be added to these solvents.
In addition to the compound having a repeating unit represented by the general formula (I) in the above polymerizable liquid crystal composition and having a weight average molecular weight of 100 or more, a polymerization inhibitor, a polymerization initiator, an antioxidant, or an ultraviolet ray You may contain additives, such as an absorber.
以下、実施例を挙げて本願発明を更に詳述するが、本願発明はこれらの実施例に限定されるものではない。
空気界面におけるチルト角の測定は以下の方法によって行った。He-Neレーザーを使用して位相差の入射角依存を測定し、得られた測定結果をコンピュータシミュレーションソフト(シンテック社製LCD-Master)を用いて解析を行い、空気界面におけるチルト角を求めた。又、以下の実施例で述べる重量平均分子量は、TSKgel GMHXLを2本と、TSKgel G2000HXL、TSKgel G1000HXL(何れも東ソー製)のカラムを使用したGPC分析装置(東ソー社製HLC-8220GPC)により、溶媒テトラヒドロフラン、示差屈折計検出により検出し、ポリスチレン換算で求めた。
EXAMPLES Hereinafter, although an Example is given and this invention is further explained in full detail, this invention is not limited to these Examples.
The tilt angle at the air interface was measured by the following method. The He-Ne laser was used to measure the incident angle dependency of the phase difference, and the obtained measurement results were analyzed using computer simulation software (LCD-Master, manufactured by Shintec) to determine the tilt angle at the air interface. . In addition, the weight average molecular weight described in the following examples was determined using a GPC analyzer (HLC-8220GPC manufactured by Tosoh Corporation) using two TSKgel GMHXL and TSKgel G2000HXL and TSKgel G1000HXL (both manufactured by Tosoh Corporation) columns. Tetrahydrofuran was detected by differential refractometer detection, and determined in terms of polystyrene.
(実施例1)
式(a)の化合物70質量%
Example 1
70% by mass of the compound of the formula (a)
(実施例2)
重合性液晶組成物(A)97.7質量%に光重合開始剤Irgacure-651(チバスペシャリティケミカルズ社製)2.0質量%、式(I-c) で表される繰り返し単位を有する化合物(ダイキン工業社製ダイフロイル#50、重量平均分子量800)を0.3質量%添加した本願発明の重合性液晶組成物(A2)を調製した後、重合性液晶組成物(A2)を25%質量含有するプロピレングリコールモノメチルエーテルアセテート溶液を調製した。次に、ガラス基板上にポリイミド配向剤AL1254(JSR社製)をスピンコート(2000回転/分、30秒)した後、150℃で1時間乾燥させることにより製膜した。このように製膜したポリイミド薄膜表面を基板の長手方向にラビング処理して、配向膜を形成した。この配向膜の上に、重合性液晶組成物(A2)を25質量%含有するプロピレングリコールモノメチルエーテルアセテート溶液をスピンコート(700回転/分、15秒)した。スピンコートした基板に窒素雰囲気中で4mW/cm2の紫外線を120秒照射して、重合性液晶組成物(A2)を硬化させた。このようにして得られた光学異方体の位相差の入射角依存測定をした結果、空気界面におけるチルト角は約0°であった。又、このようにして得られた光学異方体の上に重合性液晶組成物(A2)を25%質量含有するプロピレングリコールモノメチルエーテルアセテート溶液をスピンコート(1800回転/分、15秒)し、窒素雰囲気中で4mW/cm2の紫外線を120秒照射して、重合性液晶組成物(A2)を硬化させたところ、はじきのない良好な積層光学異方体が得られた。
(Example 2)
Polymeric liquid crystal composition (A) 97.7% by mass, photopolymerization initiator Irgacure-651 (manufactured by Ciba Specialty Chemicals) 2.0% by mass, a compound having a repeating unit represented by the formula (Ic) (Daifloil # manufactured by Daikin Industries, Ltd.) 50 and a polymerizable liquid crystal composition (A2) of the present invention to which 0.3% by mass of a weight average molecular weight of 800) was added, and then a propylene glycol monomethyl ether acetate solution containing 25% by mass of the polymerizable liquid crystal composition (A2) was prepared. Prepared. Next, a polyimide alignment agent AL1254 (manufactured by JSR) was spin-coated on a glass substrate (2000 rotations / minute, 30 seconds), and then dried at 150 ° C. for 1 hour to form a film. The polyimide thin film surface thus formed was rubbed in the longitudinal direction of the substrate to form an alignment film. On this alignment film, a propylene glycol monomethyl ether acetate solution containing 25% by mass of the polymerizable liquid crystal composition (A2) was spin-coated (700 rotations / minute, 15 seconds). The polymerizable liquid crystal composition (A2) was cured by irradiating the spin-coated substrate with 4 mW / cm 2 of ultraviolet light for 120 seconds in a nitrogen atmosphere. As a result of measuring the incident angle dependence of the phase difference of the optical anisotropic body thus obtained, the tilt angle at the air interface was about 0 °. In addition, a propylene glycol monomethyl ether acetate solution containing 25% by mass of the polymerizable liquid crystal composition (A2) was spin-coated on the optical anisotropic body thus obtained (1800 revolutions / minute, 15 seconds), When the polymerizable liquid crystal composition (A2) was cured by irradiating with 4 mW / cm 2 of ultraviolet rays for 120 seconds in a nitrogen atmosphere, a good laminated optically anisotropic body without repelling was obtained.
(実施例3)
重合性液晶組成物(A)97.9質量%に光重合開始剤Irgacure-651(チバスペシャリティケミカルズ社製)2.0質量%、式(I-a)及び(I-b)を有する共重合体(ソルベイソレクシス社製TECNOFLON N535、重量平均分子量180,000)を0.1質量%添加した本願発明の重合性液晶組成物(A3)を調製した後、重合性液晶組成物(A3)を25%質量含有するプロピレングリコールモノメチルエーテルアセテート溶液を調製した。次に、ガラス基板上にポリイミド配向剤AL1254(JSR社製)をスピンコート(2000回転/分、30秒)した後、150℃で1時間乾燥させることにより製膜した。このように製膜したポリイミド薄膜表面を基板の長手方向にラビング処理して、配向膜を形成した。この配向膜の上に、重合性液晶組成物(A3)を25質量%含有するプロピレングリコールモノメチルエーテルアセテート溶液をスピンコート(700回転/分、15秒)した。スピンコートした基板に窒素雰囲気中で4mW/cm2の紫外線を120秒照射して、重合性液晶組成物(A3)を硬化させた。このようにして得られた光学異方体の位相差の入射角依存測定をした結果、空気界面におけるチルト角は約0°であった。次に、光学異方体を150℃で1時間焼成した。このようにして得られた光学異方体の上に、ポリイミド配向剤AL1254(JSR社製)をスピンコート(2000回転/分、30秒)した後、150℃で1時間乾燥させることにより製膜した。このように製膜したポリイミド薄膜表面を重合性液晶分子長軸方向に対して60°方向にラビング処理し、その上に重合性液晶組成物(A3)を25%質量含有するプロピレングリコールモノメチルエーテルアセテート溶液をスピンコート(1800回転/分、15秒)し、窒素雰囲気中で4mW/cm2の紫外線を120秒照射して、重合性液晶組成物(A3)を硬化させたところ、はじきのない良好な広帯域円偏光板が得られた。
(Example 3)
Polymerizable liquid crystal composition (A) 97.9% by mass, photopolymerization initiator Irgacure-651 (manufactured by Ciba Specialty Chemicals) 2.0% by mass, copolymer having formulas (Ia) and (Ib) (TECNOFLON manufactured by Solvay Solexis N535, a weight average molecular weight of 180,000) 0.1% by mass of a polymerizable liquid crystal composition (A3) of the present invention was prepared, and then a propylene glycol monomethyl ether acetate solution containing 25% by mass of the polymerizable liquid crystal composition (A3) was prepared. Prepared. Next, a polyimide alignment agent AL1254 (manufactured by JSR) was spin-coated on a glass substrate (2000 rotations / minute, 30 seconds), and then dried at 150 ° C. for 1 hour to form a film. The polyimide thin film surface thus formed was rubbed in the longitudinal direction of the substrate to form an alignment film. On this alignment film, a propylene glycol monomethyl ether acetate solution containing 25% by mass of the polymerizable liquid crystal composition (A3) was spin-coated (700 rotations / minute, 15 seconds). The polymerizable liquid crystal composition (A3) was cured by irradiating the spin-coated substrate with 4 mW / cm 2 of ultraviolet light for 120 seconds in a nitrogen atmosphere. As a result of measuring the incident angle dependence of the phase difference of the optical anisotropic body thus obtained, the tilt angle at the air interface was about 0 °. Next, the optical anisotropic body was fired at 150 ° C. for 1 hour. A polyimide alignment agent AL1254 (manufactured by JSR) is spin-coated (2000 rotations / minute, 30 seconds) on the optically anisotropic body thus obtained, and then dried at 150 ° C. for 1 hour to form a film. did. Propylene glycol monomethyl ether acetate containing 25% by mass of the polymerizable liquid crystal composition (A3) on the surface of the polyimide thin film thus formed is rubbed in the direction of 60 ° with respect to the longitudinal direction of the polymerizable liquid crystal molecule. The solution was spin-coated (1800 rpm, 15 seconds) and irradiated with 4 mW / cm 2 of UV light in a nitrogen atmosphere for 120 seconds to cure the polymerizable liquid crystal composition (A3). A wide-band circularly polarizing plate was obtained.
(実施例4)
重合性液晶組成物(A)97.9質量%に光重合開始剤Irgacure-651(チバスペシャリティケミカルズ社製)2.0質量%、式(I-a)及び(I-b)を有する共重合体(ソルベイソレクシス社製TECNOFLON N535、重量平均分子量180,000)を0.1質量%添加した本願発明の重合性液晶組成物(A4)を調製した後、重合性液晶組成物(A4)を25%質量含有するプロピレングリコールモノメチルエーテルアセテート溶液を調製した。次に、ガラス基板上にポリイミド配向剤AL1254(JSR社製)をスピンコート(2000回転/分、30秒)した後、150℃で1時間乾燥させることにより製膜した。このように製膜したポリイミド薄膜表面を基板の長手方向にラビング処理して、配向膜を形成した。この配向膜の上に、重合性液晶組成物(A4)を25質量%含有するプロピレングリコールモノメチルエーテルアセテート溶液をスピンコート(700回転/分、15秒)した。スピンコートした基板に窒素雰囲気中で4mW/cm2の紫外線を120秒照射して、重合性液晶組成物(A4)を硬化させた。このようにして得られた光学異方体の位相差の入射角依存測定をした結果、空気界面におけるチルト角は約0°であった。又、このようにして得られた光学異方体の上に、重合度2000のポリビニルアルコール(東京化成工業社製)が1質量%となるように水:エタノール=1:7の溶媒で溶解した配向剤をスピンコート(1000回転/分、30秒)することによりポリビニルアルコール薄膜を製膜した。このように製膜したポリビニルアルコール薄膜表面を実施例3と同様に重合性液晶分子長軸方向に対して60°方向にラビング処理し、その上に重合性液晶組成物(A4)を25%質量含有するプロピレングリコールモノメチルエーテルアセテート溶液をスピンコート(1800回転/分、15秒)し、窒素雰囲気中で4mW/cm2の紫外線を120秒照射して、重合性液晶組成物(A4)を硬化させたところ、はじきのない良好な広帯域円偏光板が得られた。
Example 4
Polymerizable liquid crystal composition (A) 97.9% by mass, photopolymerization initiator Irgacure-651 (manufactured by Ciba Specialty Chemicals) 2.0% by mass, copolymer having formulas (Ia) and (Ib) (TECNOFLON manufactured by Solvay Solexis N535, a polymerizable liquid crystal composition (A4) of the present invention to which 0.1% by mass of a weight average molecular weight of 180,000) was added, and then a propylene glycol monomethyl ether acetate solution containing 25% by mass of the polymerizable liquid crystal composition (A4) was prepared. Prepared. Next, a polyimide alignment agent AL1254 (manufactured by JSR) was spin-coated on a glass substrate (2000 rotations / minute, 30 seconds), and then dried at 150 ° C. for 1 hour to form a film. The polyimide thin film surface thus formed was rubbed in the longitudinal direction of the substrate to form an alignment film. On this alignment film, a propylene glycol monomethyl ether acetate solution containing 25% by mass of the polymerizable liquid crystal composition (A4) was spin-coated (700 rotations / minute, 15 seconds). The polymerizable liquid crystal composition (A4) was cured by irradiating the spin-coated substrate with 4 mW / cm 2 of ultraviolet rays for 120 seconds in a nitrogen atmosphere. As a result of measuring the incident angle dependence of the phase difference of the optical anisotropic body thus obtained, the tilt angle at the air interface was about 0 °. In addition, on the optically anisotropic body thus obtained, polyvinyl alcohol having a polymerization degree of 2000 (manufactured by Tokyo Chemical Industry Co., Ltd.) was dissolved in a solvent of water: ethanol = 1: 7 so that the concentration was 1% by mass. A polyvinyl alcohol thin film was formed by spin coating the alignment agent (1000 rotations / minute, 30 seconds). The polyvinyl alcohol thin film surface thus formed was rubbed in the direction of 60 ° with respect to the major axis direction of the polymerizable liquid crystal molecules in the same manner as in Example 3, and 25% by mass of the polymerizable liquid crystal composition (A4) was formed thereon. The propylene glycol monomethyl ether acetate solution is spin-coated (1800 rev / min, 15 seconds) and irradiated with 4 mW / cm 2 of UV light in a nitrogen atmosphere for 120 seconds to cure the polymerizable liquid crystal composition (A4). As a result, a good broadband circularly polarizing plate having no repelling was obtained.
(比較例1)
重合性液晶組成物(A)98質量%に光重合開始剤Irgacure-651(チバスペシャリティケミカルズ社製)2.0質量%を添加した重合性液晶組成物(A5)を調製した後、重合性液晶組成物(A5)を25質量%含有するプロピレングリコールモノメチルエーテルアセテート溶液を調製した。次に、ガラス基板上にポリイミド配向剤AL1254(JSR社製)をスピンコート(2000回転/分、30秒)した後、150℃で1時間乾燥させることにより製膜した。このように製膜したポリイミド薄膜表面を基板の長手方向にラビング処理して、配向膜を形成した。この配向膜の上に、重合性液晶組成物(A5)を25質量%含有するプロピレングリコールモノメチルエーテルアセテート溶液をスピンコート(700回転/分、15秒)した。スピンコートした基板に窒素雰囲気中で4mW/cm2の紫外線を120秒照射して、重合性液晶組成物(A5)を硬化させた。このようにして得られた光学異方体の位相差の入射角依存測定をした結果、空気界面におけるチルト角は約°45であった。
(Comparative Example 1)
A polymerizable liquid crystal composition (A5) prepared by adding 2.0% by mass of a photopolymerization initiator Irgacure-651 (manufactured by Ciba Specialty Chemicals) to 98% by mass of a polymerizable liquid crystal composition (A) is prepared. A propylene glycol monomethyl ether acetate solution containing 25% by mass of (A5) was prepared. Next, a polyimide alignment agent AL1254 (manufactured by JSR) was spin-coated on a glass substrate (2000 rotations / minute, 30 seconds), and then dried at 150 ° C. for 1 hour to form a film. The polyimide thin film surface thus formed was rubbed in the longitudinal direction of the substrate to form an alignment film. On this alignment film, a propylene glycol monomethyl ether acetate solution containing 25% by mass of the polymerizable liquid crystal composition (A5) was spin-coated (700 rotations / minute, 15 seconds). The polymerizable liquid crystal composition (A5) was cured by irradiating the spin-coated substrate with 4 mW / cm 2 of ultraviolet rays for 120 seconds in a nitrogen atmosphere. As a result of measuring the incident angle dependence of the phase difference of the optical anisotropic body thus obtained, the tilt angle at the air interface was about ° 45.
(比較例2)
重合性液晶組成物(A)97.9質量%に光重合開始剤Irgacure-651(チバスペシャリティケミカルズ社製)2.0質量%、界面活性剤FC171(3M社製)を0.1質量%添加した重合性液晶組成物(A6)を調製した。次に重合性液晶組成物(A6)を25%質量含有するプロピレングリコールモノメチルエーテルアセテート溶液を調製した。次に、ガラス基板上にポリイミド配向剤AL1254(JSR社製)をスピンコート(2000回転/分、30秒)した後、150℃で1時間乾燥させることにより製膜した。このように製膜したポリイミド薄膜表面を基板の長手方向にラビング処理して、配向膜を形成した。この配向膜の上に、重合性液晶組成物(A6)を25質量%含有するプロピレングリコールモノメチルエーテルアセテート溶液をスピンコート(700回転/分、15秒)した。スピンコートした基板に窒素雰囲気中で4mW/cm2の紫外線を120秒照射して、重合性液晶組成物(A6)を硬化させた。このようにして得られた光学異方体の位相差の入射角依存測定をした結果、空気界面におけるチルト角は約0°であった。又、このようにして得られた光学異方体の上に、重合性液晶組成物(A6)を25%質量含有するプロピレングリコールモノメチルエーテルアセテート溶液をスピンコート(1800回転/分、15秒)したところ、はじきが発生し、良好な積層光学異方体は得られなかった。
(Comparative Example 2)
Polymerizable liquid crystal composition (A) Polymeric liquid crystal composition obtained by adding 2.0% by mass of photopolymerization initiator Irgacure-651 (manufactured by Ciba Specialty Chemicals) and 0.1% by mass of surfactant FC171 (manufactured by 3M) to 97.9% by mass (A6) was prepared. Next, a propylene glycol monomethyl ether acetate solution containing 25% by mass of the polymerizable liquid crystal composition (A6) was prepared. Next, a polyimide alignment agent AL1254 (manufactured by JSR) was spin-coated on a glass substrate (2000 rotations / minute, 30 seconds), and then dried at 150 ° C. for 1 hour to form a film. The polyimide thin film surface thus formed was rubbed in the longitudinal direction of the substrate to form an alignment film. On this alignment film, a propylene glycol monomethyl ether acetate solution containing 25% by mass of the polymerizable liquid crystal composition (A6) was spin-coated (700 rotations / minute, 15 seconds). The polymerizable liquid crystal composition (A6) was cured by irradiating the spin-coated substrate with 4 mW / cm 2 of ultraviolet rays for 120 seconds in a nitrogen atmosphere. As a result of measuring the incident angle dependence of the phase difference of the optical anisotropic body thus obtained, the tilt angle at the air interface was about 0 °. Further, a propylene glycol monomethyl ether acetate solution containing 25% by mass of the polymerizable liquid crystal composition (A6) was spin-coated (1800 revolutions / minute, 15 seconds) on the optically anisotropic body thus obtained. However, repelling occurred and a good laminated optical anisotropic body could not be obtained.
(実施例5)
重合性液晶組成物(A)97.0質量%に光重合開始剤Irgacure-651(チバスペシャリティケミカルズ社製)2.0質量%、式(I-a)及び(I-b)を有する共重合体(ソルベイソレクシス社製TECNOFLON N535、重量平均分子量180,000)を1.0質量%添加した本願発明の重合性液晶組成物(A7)を調製した後、重合性液晶組成物(A7)を25%質量含有するプロピレングリコールモノメチルエーテルアセテート溶液を調製した。次に、ガラス基板上にポリイミド配向剤AL1254(JSR社製)をスピンコート(2000回転/分、30秒)した後、150℃で1時間乾燥させることにより製膜した。このように製膜したポリイミド薄膜表面を基板の長手方向にラビング処理して、配向膜を形成した。この配向膜の上に、重合性液晶組成物(A7)を25質量%含有するプロピレングリコールモノメチルエーテルアセテート溶液をスピンコート(700回転/分、15秒)した。スピンコートした基板に窒素雰囲気中で4mW/cm2の紫外線を120秒照射して、重合性液晶組成物(A7)を硬化させた。このようにして得られた光学異方体の位相差の入射角依存測定をした結果、空気界面におけるチルト角は約0°であった。このようにして得られた光学異方体の表面を基板の長手方向にラビングして、ポリイミド配向膜付きガラス基板とラビング方向を直交させて6μmの間隔を保って対向してTNセルを作製した。作製したセルに化合物(c)20質量%、化合物(d)25質量%、化合物(e)20質量%、化合物(f)20質量%、化合物(g)7質量%及び化合物(h)8質量%からなる液晶(B)を注入し、印加電圧5V、フレーム時間16.6ms、パルス印加時間64μs、測定温度70℃の条件で電圧保持率を測定した結果、94.6%であった。化合物(c)〜(h)は以下に示す。
(Example 5)
Polymeric liquid crystal composition (A) 97.0% by mass, photopolymerization initiator Irgacure-651 (manufactured by Ciba Specialty Chemicals) 2.0% by mass, copolymer having formulas (Ia) and (Ib) (TECNOFLON manufactured by Solvay Solexis) After preparing a polymerizable liquid crystal composition (A7) of the present invention to which 1.0% by mass of N535 and a weight average molecular weight of 180,000) was added, a propylene glycol monomethyl ether acetate solution containing 25% by mass of the polymerizable liquid crystal composition (A7) was prepared. Prepared. Next, a polyimide alignment agent AL1254 (manufactured by JSR) was spin-coated on a glass substrate (2000 rotations / minute, 30 seconds), and then dried at 150 ° C. for 1 hour to form a film. The polyimide thin film surface thus formed was rubbed in the longitudinal direction of the substrate to form an alignment film. On this alignment film, a propylene glycol monomethyl ether acetate solution containing 25% by mass of the polymerizable liquid crystal composition (A7) was spin-coated (700 rotations / minute, 15 seconds). The polymerizable liquid crystal composition (A7) was cured by irradiating the spin-coated substrate with 4 mW / cm 2 of ultraviolet rays for 120 seconds in a nitrogen atmosphere. As a result of measuring the incident angle dependence of the phase difference of the optical anisotropic body thus obtained, the tilt angle at the air interface was about 0 °. The surface of the optically anisotropic body thus obtained was rubbed in the longitudinal direction of the substrate, and a TN cell was produced by facing the glass substrate with a polyimide alignment film perpendicular to the rubbing direction at a distance of 6 μm. . Compound (c) 20% by mass, compound (d) 25% by mass, compound (e) 20% by mass, compound (f) 20% by mass, compound (g) 7% by mass and compound (h) 8% by mass in the prepared cell % Liquid crystal (B) was injected, and the voltage holding ratio was measured under the conditions of an applied voltage of 5 V, a frame time of 16.6 ms, a pulse application time of 64 μs, and a measurement temperature of 70 ° C. and found to be 94.6%. Compounds (c) to (h) are shown below.
(比較例3)
重合性液晶組成物(A)97.0質量%に光重合開始剤Irgacure-651(チバスペシャリティケミカルズ社製)2.0質量%、界面活性剤FC171(3M社製)を1.0質量%添加した重合性液晶組成物(A8)を調製した。次に重合性液晶組成物(A8)を25質量%含有するプロピレングリコールモノメチルエーテルアセテート溶液を調製した。次に、ガラス基板上にポリイミド配向剤AL1254(JSR社製)をスピンコート(2000回転/分、30秒)した後、150℃で1時間乾燥させることにより製膜した。このように製膜したポリイミド薄膜表面を基板の長手方向にラビング処理して、配向膜を形成した。この配向膜の上に、重合性液晶組成物(A8)を25質量%含有するプロピレングリコールモノメチルエーテルアセテート溶液をスピンコート(700回転/分、15秒)した。スピンコートした基板に窒素雰囲気中で4mW/cm2の紫外線を120秒照射して、重合性液晶組成物(A8)を硬化させた。このようにして得られた光学異方体の位相差の入射角依存測定をした結果、空気界面におけるチルト角は約0°であることが確認できた。このようにして得られた光学異方体の表面を基板の長手方向にラビングして、ポリイミド配向膜付きガラス基板とラビング方向を直交させて6μmの間隔を保って対向して作製したTNセルに液晶(B)を注入し、印加電圧5V、フレーム時間16.6ms、パルス印加時間64μs、測定温度70℃の条件で電圧保持率を測定した結果、89.2%であった。
(Comparative Example 3)
Polymerizable liquid crystal composition (A) Polymeric liquid crystal composition obtained by adding 2.0% by mass of photopolymerization initiator Irgacure-651 (manufactured by Ciba Specialty Chemicals) and 1.0% by mass of surfactant FC171 (manufactured by 3M) to 97.0% by mass (A8) was prepared. Next, a propylene glycol monomethyl ether acetate solution containing 25% by mass of the polymerizable liquid crystal composition (A8) was prepared. Next, a polyimide alignment agent AL1254 (manufactured by JSR) was spin-coated on a glass substrate (2000 rotations / minute, 30 seconds), and then dried at 150 ° C. for 1 hour to form a film. The polyimide thin film surface thus formed was rubbed in the longitudinal direction of the substrate to form an alignment film. On this alignment film, a propylene glycol monomethyl ether acetate solution containing 25% by mass of the polymerizable liquid crystal composition (A8) was spin-coated (700 rotations / minute, 15 seconds). The polymerizable liquid crystal composition (A8) was cured by irradiating the spin-coated substrate with 4 mW / cm 2 of ultraviolet rays for 120 seconds in a nitrogen atmosphere. As a result of measuring the incident angle dependence of the phase difference of the optical anisotropic body thus obtained, it was confirmed that the tilt angle at the air interface was about 0 °. The surface of the optically anisotropic body thus obtained was rubbed in the longitudinal direction of the substrate, and the TN cell produced by facing the glass substrate with a polyimide alignment film perpendicular to the rubbing direction and keeping an interval of 6 μm was used. The liquid crystal (B) was injected, and the voltage holding ratio was measured under the conditions of an applied voltage of 5 V, a frame time of 16.6 ms, a pulse application time of 64 μs, and a measurement temperature of 70 ° C. As a result, it was 89.2%.
(実施例6)
式(i)の化合物60質量%
(Example 6)
60% by mass of the compound of formula (i)
(実施例7)
重合性液晶組成物(C)96.9質量%に光重合開始剤Irgacure-907(チバスペシャリティケミカルズ社製)3.0質量%、式(I-a)及び式(I-f)を有する共重合体(アルケマ社製KYNAR7201、重量平均分子量160,000)を0.1質量%添加した本願発明の重合性液晶組成物(C2)を調製した後、重合性液晶組成物(C2)を25%質量含有するプロピレングリコールモノメチルエーテルアセテート溶液を調製した。次に、ガラス基板上にポリイミド配向剤AL1254(JSR社製)をスピンコート(2000回転/分、30秒)した後、150℃で1時間乾燥させることにより製膜した。このように製膜したポリイミド薄膜表面を基板の長手方向にラビング処理して、配向膜を形成した。この配向膜の上に、重合性液晶組成物(C2)を25質量%含有するプロピレングリコールモノメチルエーテルアセテート溶液をスピンコート(700回転/分、15秒)した。スピンコートした基板に30mW/cm2の紫外線を30秒照射して、重合性液晶組成物(C2)を硬化させた。このようにして得られた光学異方体の位相差の入射角依存測定をした結果、空気界面におけるチルト角は約0°であった。又、このようにして得られた光学異方体の上に重合性液晶組成物(C2)を25%質量含有するプロピレングリコールモノメチルエーテルアセテート溶液をスピンコート(1800回転/分、15秒)し、30mW/cm2の紫外線を30秒照射して、重合性液晶組成物(C2)を硬化させたところ、はじきのない良好な積層光学異方体が得られた。
(Example 7)
Polymerizable liquid crystal composition (C) 96.9% by mass, photopolymerization initiator Irgacure-907 (manufactured by Ciba Specialty Chemicals) 3.0% by mass, a copolymer having formula (Ia) and formula (If) (KYNAR7201, manufactured by Arkema, After preparing the polymerizable liquid crystal composition (C2) of the present invention to which 0.1% by mass of a weight average molecular weight 160,000) was added, a propylene glycol monomethyl ether acetate solution containing 25% by mass of the polymerizable liquid crystal composition (C2) was prepared. . Next, a polyimide alignment agent AL1254 (manufactured by JSR) was spin-coated on a glass substrate (2000 rotations / minute, 30 seconds), and then dried at 150 ° C. for 1 hour to form a film. The polyimide thin film surface thus formed was rubbed in the longitudinal direction of the substrate to form an alignment film. On this alignment film, a propylene glycol monomethyl ether acetate solution containing 25% by mass of the polymerizable liquid crystal composition (C2) was spin-coated (700 rotations / minute, 15 seconds). The polymerizable liquid crystal composition (C2) was cured by irradiating the spin-coated substrate with 30 mW / cm 2 of ultraviolet rays for 30 seconds. As a result of measuring the incident angle dependence of the phase difference of the optical anisotropic body thus obtained, the tilt angle at the air interface was about 0 °. In addition, a propylene glycol monomethyl ether acetate solution containing 25% by mass of the polymerizable liquid crystal composition (C2) was spin-coated on the optical anisotropic body thus obtained (1800 revolutions / minute, 15 seconds), When the polymerizable liquid crystal composition (C2) was cured by irradiating 30 mW / cm 2 of ultraviolet rays for 30 seconds, a good laminated optical anisotropic body without repelling was obtained.
(実施例8)
重合性液晶組成物(C)96.9質量%に光重合開始剤Irgacure-907(チバスペシャリティケミカルズ社製)3.0質量%、式(I-a)、(I-b)及び式(I-f)を有する共重合体(アルケマ社製KYNAR9301、重量平均分子量61,000)を0.1質量%添加した本願発明の重合性液晶組成物(C3)を調製した後、重合性液晶組成物(C3)を25%質量含有するプロピレングリコールモノメチルエーテルアセテート溶液を調製した。次に、ガラス基板上にポリイミド配向剤AL1254(JSR社製)をスピンコート(2000回転/分、30秒)した後、150℃で1時間乾燥させることにより製膜した。このように製膜したポリイミド薄膜表面を基板の長手方向にラビング処理して、配向膜を形成した。この配向膜の上に、重合性液晶組成物(C3)を25質量%含有するプロピレングリコールモノメチルエーテルアセテート溶液をスピンコート(700回転/分、15秒)した。スピンコートした基板に30mW/cm2の紫外線を30秒照射して、重合性液晶組成物(C3)を硬化させた。このようにして得られた光学異方体の位相差の入射角依存測定をした結果、空気界面におけるチルト角は約0°であった。又、このようにして得られた光学異方体の上に重合性液晶組成物(C3)を25%質量含有するプロピレングリコールモノメチルエーテルアセテート溶液をスピンコート(1800回転/分、15秒)し、30mW/cm2の紫外線を30秒照射して、重合性液晶組成物(C3)を硬化させたところ、はじきのない良好な積層光学異方体が得られた。
(Example 8)
Polymeric liquid crystal composition (C) 96.9% by mass, photopolymerization initiator Irgacure-907 (manufactured by Ciba Specialty Chemicals) 3.0% by mass, copolymer having formula (Ia), (Ib) and formula (If) (Arkema Propylene glycol monomethyl ether acetate containing 25% by mass of the polymerizable liquid crystal composition (C3) after preparing the polymerizable liquid crystal composition (C3) of the present invention to which 0.1% by mass of KYNAR9301 manufactured by the company, weight average molecular weight 61,000) was added A solution was prepared. Next, a polyimide alignment agent AL1254 (manufactured by JSR) was spin-coated on a glass substrate (2000 rotations / minute, 30 seconds), and then dried at 150 ° C. for 1 hour to form a film. The polyimide thin film surface thus formed was rubbed in the longitudinal direction of the substrate to form an alignment film. On this alignment film, a propylene glycol monomethyl ether acetate solution containing 25% by mass of the polymerizable liquid crystal composition (C3) was spin-coated (700 rotations / minute, 15 seconds). The polymerizable liquid crystal composition (C3) was cured by irradiating the spin-coated substrate with 30 mW / cm 2 ultraviolet rays for 30 seconds. As a result of measuring the incident angle dependence of the phase difference of the optical anisotropic body thus obtained, the tilt angle at the air interface was about 0 °. Further, a propylene glycol monomethyl ether acetate solution containing 25% by mass of the polymerizable liquid crystal composition (C3) was spin-coated (1800 rpm) for 15 seconds on the optical anisotropic body thus obtained. When the polymerizable liquid crystal composition (C3) was cured by irradiating with 30 mW / cm 2 of ultraviolet rays for 30 seconds, a good laminated optical anisotropic body without repelling was obtained.
(実施例9)
重合性液晶組成物(C)96.9質量%に光重合開始剤Irgacure-907(チバスペシャリティケミカルズ社製)3.0質量%、式(I-a)、(I-b)及び式(I-f)を有する共重合体(重量平均分子量18,000)を0.1質量%添加した本願発明の重合性液晶組成物(C4)を調製した後、重合性液晶組成物(C4)を25%質量含有するプロピレングリコールモノメチルエーテルアセテート溶液を調製した。次に、ガラス基板上にポリイミド配向剤AL1254(JSR社製)をスピンコート(2000回転/分、30秒)した後、150℃で1時間乾燥させることにより製膜した。このように製膜したポリイミド薄膜表面を基板の長手方向にラビング処理して、配向膜を形成した。この配向膜の上に、重合性液晶組成物(C4)を25質量%含有するプロピレングリコールモノメチルエーテルアセテート溶液をスピンコート(700回転/分、15秒)した。スピンコートした基板に30mW/cm2の紫外線を30秒照射して、重合性液晶組成物(C4)を硬化させた。このようにして得られた光学異方体の位相差の入射角依存測定をした結果、空気界面におけるチルト角は約0°であった。又、このようにして得られた光学異方体の上に重合性液晶組成物(C4)を25%質量含有するプロピレングリコールモノメチルエーテルアセテート溶液をスピンコート(1800回転/分、15秒)し、30mW/cm2の紫外線を30秒照射して、重合性液晶組成物(C4)を硬化させたところ、はじきのない良好な積層光学異方体が得られた。
Example 9
Polymeric liquid crystal composition (C) 96.9% by mass, photopolymerization initiator Irgacure-907 (manufactured by Ciba Specialty Chemicals) 3.0% by mass, copolymer having the formula (Ia), (Ib) and formula (If) (weight) After preparing a polymerizable liquid crystal composition (C4) of the present invention to which 0.1% by mass of an average molecular weight of 18,000) was added, a propylene glycol monomethyl ether acetate solution containing 25% by mass of the polymerizable liquid crystal composition (C4) was prepared. Next, a polyimide alignment agent AL1254 (manufactured by JSR) was spin-coated on a glass substrate (2000 rotations / minute, 30 seconds), and then dried at 150 ° C. for 1 hour to form a film. The polyimide thin film surface thus formed was rubbed in the longitudinal direction of the substrate to form an alignment film. On this alignment film, a propylene glycol monomethyl ether acetate solution containing 25% by mass of a polymerizable liquid crystal composition (C4) was spin-coated (700 rotations / minute, 15 seconds). The polymerizable liquid crystal composition (C4) was cured by irradiating the spin-coated substrate with 30 mW / cm 2 ultraviolet rays for 30 seconds. As a result of measuring the incident angle dependence of the phase difference of the optical anisotropic body thus obtained, the tilt angle at the air interface was about 0 °. In addition, a propylene glycol monomethyl ether acetate solution containing 25% by mass of the polymerizable liquid crystal composition (C4) was spin-coated on the optical anisotropic body thus obtained (1800 revolutions / minute, 15 seconds), When the polymerizable liquid crystal composition (C4) was cured by irradiating 30 mW / cm 2 of ultraviolet rays for 30 seconds, a good laminated optical anisotropic body without repellency was obtained.
(実施例10)
重合性液晶組成物(C)96.9質量%に光重合開始剤Irgacure-907(チバスペシャリティケミカルズ社製)3.0質量%、式(I-a)、(I-b)及び式(I-f)を有する共重合体(重量平均分子量18,000)を0.1質量%添加した本願発明の重合性液晶組成物(C5)を調製した後、重合性液晶組成物(C5)を25%質量含有するプロピレングリコールモノメチルエーテルアセテート溶液を調製した。次に、ガラス基板上にポリイミド配向剤AL1254(JSR社製)をスピンコート(2000回転/分、30秒)した後、150℃で1時間乾燥させることにより製膜した。このように製膜したポリイミド薄膜表面を基板の長手方向にラビング処理して、配向膜を形成した。この配向膜の上に、重合性液晶組成物(C5)を25質量%含有するプロピレングリコールモノメチルエーテルアセテート溶液をスピンコート(700回転/分、15秒)した。スピンコートした基板に30mW/cm2の紫外線を30秒照射して、重合性液晶組成物(C5)を硬化させた。このようにして得られた光学異方体の位相差の入射角依存測定をした結果、空気界面におけるチルト角は約0°であった。次に、光学異方体を150℃で1時間焼成した。このようにして得られた光学異方体の上に、ポリイミド配向剤AL1254(JSR社製)をスピンコート(2000回転/分、30秒)した後、150℃で1時間乾燥させることにより製膜した。このように製膜したポリイミド薄膜表面を重合性液晶分子長軸方向に対して60°方向にラビング処理し、その上に重合性液晶組成物(C5)を25%質量含有するプロピレングリコールモノメチルエーテルアセテート溶液をスピンコート(1800回転/分、15秒)し、30mW/cm2の紫外線を30秒照射して、重合性液晶組成物(C5)を硬化させたところ、はじきのない良好な広帯域円偏光板が得られた。
(Example 10)
Polymeric liquid crystal composition (C) 96.9% by mass, photopolymerization initiator Irgacure-907 (manufactured by Ciba Specialty Chemicals) 3.0% by mass, copolymer having the formula (Ia), (Ib) and formula (If) (weight) After preparing the polymerizable liquid crystal composition (C5) of the present invention to which 0.1% by mass of an average molecular weight of 18,000) was added, a propylene glycol monomethyl ether acetate solution containing 25% by mass of the polymerizable liquid crystal composition (C5) was prepared. Next, a polyimide alignment agent AL1254 (manufactured by JSR) was spin-coated on a glass substrate (2000 rotations / minute, 30 seconds), and then dried at 150 ° C. for 1 hour to form a film. The polyimide thin film surface thus formed was rubbed in the longitudinal direction of the substrate to form an alignment film. On this alignment film, a propylene glycol monomethyl ether acetate solution containing 25% by mass of a polymerizable liquid crystal composition (C5) was spin-coated (700 rotations / minute, 15 seconds). The spin-coated substrate was irradiated with 30 mW / cm 2 ultraviolet rays for 30 seconds to cure the polymerizable liquid crystal composition (C5). As a result of measuring the incident angle dependence of the phase difference of the optical anisotropic body thus obtained, the tilt angle at the air interface was about 0 °. Next, the optical anisotropic body was fired at 150 ° C. for 1 hour. A polyimide alignment agent AL1254 (manufactured by JSR) is spin-coated (2000 rotations / minute, 30 seconds) on the optically anisotropic body thus obtained, and then dried at 150 ° C. for 1 hour to form a film. did. Propylene glycol monomethyl ether acetate containing 25% by mass of the polymerizable liquid crystal composition (C5) on the polyimide thin film surface thus formed is rubbed in the direction of 60 ° with respect to the major axis direction of the polymerizable liquid crystal molecule. The solution was spin-coated (1800 rpm / min, 15 seconds) and irradiated with 30 mW / cm 2 UV rays for 30 seconds to cure the polymerizable liquid crystal composition (C5). A plate was obtained.
(実施例11)
重合性液晶組成物(C)96.9質量%に光重合開始剤Irgacure-907(チバスペシャリティケミカルズ社製)3.0質量%、式(I-a)、(I-b)及び式(I-f)を有する共重合体(重量平均分子量18,000)を0.1質量%添加した本願発明の重合性液晶組成物(C6)を調製した後、重合性液晶組成物(C6)を25%質量含有するプロピレングリコールモノメチルエーテルアセテート溶液を調製した。次に、ガラス基板上にポリイミド配向剤AL1254(JSR社製)をスピンコート(2000回転/分、30秒)した後、150℃で1時間乾燥させることにより製膜した。このように製膜したポリイミド薄膜表面を基板の長手方向にラビング処理して、配向膜を形成した。この配向膜の上に、重合性液晶組成物(C6)を25質量%含有するプロピレングリコールモノメチルエーテルアセテート溶液をスピンコート(700回転/分、15秒)した。スピンコートした基板に30mW/cm2の紫外線を30秒照射して、重合性液晶組成物(C6)を硬化させた。このようにして得られた光学異方体の位相差の入射角依存測定をした結果、空気界面におけるチルト角は約0°であった。又、このようにして得られた光学異方体の上に、重合度2000のポリビニルアルコール(東京化成工業社製)が1質量%となるように水:エタノール=1:7の溶媒で溶解した配向剤をスピンコート(1000回転/分、30秒)することによりポリビニルアルコール薄膜を製膜した。このように製膜したポリビニルアルコール薄膜表面を実施例10と同様に重合性液晶分子長軸方向に対して60°方向にラビング処理し、その上に重合性液晶組成物(C6)を25%質量含有するプロピレングリコールモノメチルエーテルアセテート溶液をスピンコート(1800回転/分、15秒)し、30mW/cm2の紫外線を30秒照射して、重合性液晶組成物(C6)を硬化させたところ、はじきのない良好な広帯域円偏光板が得られた。
(Example 11)
Polymeric liquid crystal composition (C) 96.9% by mass, photopolymerization initiator Irgacure-907 (manufactured by Ciba Specialty Chemicals) 3.0% by mass, copolymer having the formula (Ia), (Ib) and formula (If) (weight) After preparing the polymerizable liquid crystal composition (C6) of the present invention to which 0.1% by mass of an average molecular weight of 18,000) was added, a propylene glycol monomethyl ether acetate solution containing 25% by mass of the polymerizable liquid crystal composition (C6) was prepared. Next, a polyimide alignment agent AL1254 (manufactured by JSR) was spin-coated on a glass substrate (2000 rotations / minute, 30 seconds), and then dried at 150 ° C. for 1 hour to form a film. The polyimide thin film surface thus formed was rubbed in the longitudinal direction of the substrate to form an alignment film. On this alignment film, a propylene glycol monomethyl ether acetate solution containing 25% by mass of the polymerizable liquid crystal composition (C6) was spin-coated (700 rotations / minute, 15 seconds). The polymerizable liquid crystal composition (C6) was cured by irradiating the spin-coated substrate with 30 mW / cm 2 ultraviolet rays for 30 seconds. As a result of measuring the incident angle dependence of the phase difference of the optical anisotropic body thus obtained, the tilt angle at the air interface was about 0 °. In addition, on the optically anisotropic body thus obtained, polyvinyl alcohol having a polymerization degree of 2000 (manufactured by Tokyo Chemical Industry Co., Ltd.) was dissolved in a solvent of water: ethanol = 1: 7 so that the concentration was 1% by mass. A polyvinyl alcohol thin film was formed by spin coating the alignment agent (1000 rotations / minute, 30 seconds). The polyvinyl alcohol thin film surface thus formed was rubbed in the direction of 60 ° with respect to the major axis direction of the polymerizable liquid crystal molecules in the same manner as in Example 10, and 25% by mass of the polymerizable liquid crystal composition (C6) was formed thereon. When the polymerizable liquid crystal composition (C6) was cured by spin-coating the propylene glycol monomethyl ether acetate solution contained (1800 revolutions / minute, 15 seconds) and irradiating with 30 mW / cm 2 ultraviolet rays for 30 seconds, A good broadband circularly polarizing plate having no film was obtained.
以上の実施例と比較例から、一般式(I)で表される繰り返し単位を有する重量平均分子量が100以上である化合物を含有する重合性液晶組成物は、空気界面におけるチルト角を減じることができ、かつ、該重合性液晶組成物を硬化させた光学異方体を液晶セル内部に組み込んだ場合、界面活性剤を含有する重合性液晶組成物を硬化させた光学異方体と比較して、高い電圧保持率を示し、積層膜の形成が容易であることがわかり、本願発明の重合性液晶組成物は液晶セル内部に組み込む光学異方体の材料として好適である。 From the above Examples and Comparative Examples, the polymerizable liquid crystal composition containing a compound having a repeating unit represented by the general formula (I) and having a weight average molecular weight of 100 or more can reduce the tilt angle at the air interface. And when an optically anisotropic body obtained by curing the polymerizable liquid crystal composition is incorporated in the liquid crystal cell, compared with an optically anisotropic body obtained by curing the polymerizable liquid crystal composition containing a surfactant. Thus, it can be seen that a high voltage holding ratio is obtained and the formation of the laminated film is easy, and the polymerizable liquid crystal composition of the present invention is suitable as a material for an optical anisotropic body incorporated in the liquid crystal cell.
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