JP6657941B2 - 液晶積層体、および、液晶積層体の製造方法 - Google Patents
液晶積層体、および、液晶積層体の製造方法 Download PDFInfo
- Publication number
- JP6657941B2 JP6657941B2 JP2015256015A JP2015256015A JP6657941B2 JP 6657941 B2 JP6657941 B2 JP 6657941B2 JP 2015256015 A JP2015256015 A JP 2015256015A JP 2015256015 A JP2015256015 A JP 2015256015A JP 6657941 B2 JP6657941 B2 JP 6657941B2
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- Japan
- Prior art keywords
- layer
- liquid crystal
- adhesive layer
- laminate
- photocurable resin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- NTIZESTWPVYFNL-UHFFFAOYSA-N Methyl isobutyl ketone Chemical compound CC(C)CC(C)=O NTIZESTWPVYFNL-UHFFFAOYSA-N 0.000 claims description 7
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- RZXDTJIXPSCHCI-UHFFFAOYSA-N hexa-1,5-diene-2,5-diol Chemical compound OC(=C)CCC(O)=C RZXDTJIXPSCHCI-UHFFFAOYSA-N 0.000 description 1
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Classifications
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Description
本発明は、液晶層の変形を抑えることができる液晶積層体、および、液晶積層体の製造方法を提供することを目的とする。
上記構成によれば、回折層を有する構成においても、液晶層の変形を抑えることができる。
図1から図3を参照して液晶積層体の構成を説明する。
図1が示すように、液晶積層体10は、基材11、金属層12、接着層13、および、液晶層14を備えている。基材11は、第1面11aと第2面11bとを有し、光透過性を有している。金属層12は、基材11の第1面11aの一部と対向し、接着層13は、光硬化性樹脂製の層であって、基材11の第2面11bに位置している。液晶層14は、接着層13のうち、基材11に接する面とは反対側の面に位置している。
図4から図9を参照して、液晶積層体10の製造方法を説明する。
なお、図4が示すように、液晶積層体10は、液晶積層体製造装置20を用いて製造され、液晶積層体製造装置20は、ロールツーロール装置である。液晶積層体製造装置20は、複数のロール21と、照射部22とを備えている。液晶積層体製造装置20は、第1巻芯C1に巻き取られた第1基材の一例である基材11をロール21によって搬送する間に、基材11を含む第1積層体30を形成する。また、液晶積層体製造装置20は、第2巻芯C2によって巻き取られた第2基材41をロール21によって搬送する間に、第2基材41を含む第2積層体40を形成する。
図10および図11を参照して、液晶積層体10の作用を説明する。
上述した液晶積層体10は、第1積層体30に対して液晶層14を接着させる接着層として光硬化性樹脂製の接着層13を有する。そのため、硬化前の前駆層31に対して数秒以上数分以下にわたって光を照射すれば、硬化した接着層13を形成することができる。
液晶積層体10を形成するための各層の形成材料を説明する。
[基材]
基材11は、回折層15の形成時に基材11に熱圧が与えられたとき、軟化することによって変形しない程度の耐熱性と機械的な強度とを有していればよい。基材11は、押出加工やキャスト加工によって製造された無延伸フィルムであってもよいし、延伸加工によって製造された延伸フィルムであってもよい。また、基材11は、延伸フィルムのうち、1軸延伸フィルムであってもよいし、2軸延伸フィルムであってもよい。
基材11の厚さは、基材11の操作性および加工性の各々を高める観点から、12μm以上100μm以下であることが好ましい。
回折層15の形成材料は、スタンパを用いた成形が可能な材料であればよく、熱可塑性樹脂、熱硬化性樹脂、紫外線硬化性樹脂、および、電子線硬化性樹脂のいずれであってもよい。熱可塑性樹脂は、例えば、アクリル系樹脂、セルロース系樹脂、および、ビニル系樹脂などである。熱硬化性樹脂は、反応性を有した水酸基を有するアクリルポリオールやポリエステルポリオールなどにポリイソシアネートを架橋剤として添加または架橋したウレタン樹脂、メラミン系樹脂、および、フェノール樹脂などである。紫外線硬化性樹脂および電子線硬化性樹脂は、エポキシ(メタ)アクリル、および、ウレタン(メタ)アクリルなどである。
金属層12の形成材料には、例えば、アルミニウム(Al)、スズ(Sn)、クロム(Cr)、ニッケル(Ni)、銅(Cu)、および、金(Au)などの光を反射する効率の高い金属を用いることができる。金属層12は、単層構造を有してもよいし、形成材料が互いに異なる複数の層から構成される積層構造を有してもよい。
マスク層16の形成材料は、金属膜のエッチャントに対する耐性を有し、かつ、金属膜に対して密着性を有する材料であればよい。金属膜の形成材料が、例えばアルミニウムであるときには、マスク層16の形成材料には、例えば、塩化ビニル‐酢酸ビニル共重合体、ウレタン樹脂、ポリオレフィン樹脂、ポリエチレンイミン樹脂、アクリル樹脂、シリコーン樹脂などを用いることができる。なお、マスク層16は、単層構造を有してもよいし、各層の形成材料が互いに異なる複数の層から構成された積層構造を有してもよい。
接着層13の形成材料は、光硬化性樹脂であればよく、紫外線硬化性樹脂であってもよいし、可視光硬化性樹脂であってもよい。
第2基材41は、可撓性を有し、かつ、光透過性を有する、言い換えれば透明である基材であることが好ましい。第2基材41には、延伸加工を用いて製造された延伸フィルムを用いることができる。第2基材41は、延伸フィルムのうち、1軸延伸フィルムであってもよいし、2軸延伸フィルムであってもよい。
液晶層14の形成材料は、コレステリック液晶の状態を示す液晶性化合物であればよく、コレステリック相を示す液晶性化合物でもよいし、ネマチック液晶を示す化合物に対してキラル化合物が添加された液晶性化合物であって、キラルネマチック相を示す液晶性化合物であってもよい。
液晶性化合物には、例えば、以下の構造式1から構造式5に示される化合物を用いることができる。
また、構造式1から構造式5の各々におけるChは、以下の構造式6で示される構造である。
保護層17は、光透過性を有し、液晶層14を紫外線や摩耗などから保護する層である。保護層17の形成材料には、保護層17に発現させる機能に応じて、各種の樹脂を用いることができる。保護層17は、単層構造を有してもよいし、形成材料の互いに異なる複数の層から構成される積層構造を有してもよい。また、保護層17が単層構造および積層構造のいずれを有する場合であっても、保護層17は、液晶層14に接する面とは反対側の面を含む層として、インキおよび顔料などを受容することができる層を有してもよい。
[実施例1]
第2基材として2軸延伸のPETフィルムを準備し、第2基材の1つの面にコレステリック液晶組成物を乾燥後の厚さが2μmとなるようにワイヤーバーを用いて塗工し、コレステリック液晶組成物を乾燥させることによって、液晶層を形成した。なお、コレステリック液晶組成物として、構造式1で示される化合物と、メチルケトン溶液とから構成され、組成物における固形分が30質量%であるコレステリック液晶組成物を用いた。これにより、第2積層体を得た。
第2基材として2軸延伸のPETフィルムを準備し、第2基材の1つの面にコレステリック液晶組成物を乾燥後の厚さが2μmとなるようにワイヤーバーを用いて塗工し、コレステリック液晶組成物を乾燥させることによって、液晶層を形成した。なお、コレステリック液晶組成物として、構造式1で示される化合物と、メチルケトン溶液とから構成され、組成物における固形分が30質量%であるコレステリック液晶組成物を用いた。これにより、第2積層体を得た。
実施例1の液晶積層体の製造工程のうち、第1積層体と第2積層体とをラミネートする工程までが完了した複数の積層体を準備し、各積層体を試験例1の積層体とした。また、比較例1の液晶積層体の製造方法のうち、第1積層体と第2積層体とをラミネートする工程までが完了した複数の積層体を準備し、各積層体を試験例2の積層体とした。
(1)基材11と液晶層14とを接着する接着層13が光硬化性樹脂で形成されているため、接着層13が熱硬化性樹脂で形成される構成と比べて、接着層13を形成するための前駆層31の硬化速度が高く、前駆層31の硬化に必要な時間が短い。それゆえに、硬化前の前駆層31に対して外力が働く可能性を低くでき、結果として、前駆層31の変形に伴う液晶層14の変形を抑えることができる。
(2)回折層15を有する構成においても、液晶層14の変形を抑えることができる。
・前駆層31に光を照射する工程では、前駆層31の全体において光硬化性樹脂の架橋反応を進めることが可能であれば、前駆層31に対して液晶層14とは反対側から、前駆層31に向けて光を照射してもよい。あるいは、前駆層31の厚さ方向と交差する方向のうち、前駆層31と対向する方向から、前駆層31に向けて光を照射してもよい。こうした構成であっても、光硬化性樹脂を含む前駆層31を硬化させて接着層13を形成する以上は、上述した(1)と同等の効果を得ることはできる。
Claims (7)
- 第1面と第2面とを有し、光透過性を有する基材と、
前記第2面に位置する光硬化性樹脂製の接着層と、
前記接着層のうち、前記基材に接する面とは反対側の面に位置する液晶層と、
前記基材に対して前記接着層とは反対側に位置し、かつ、前記第1面の一部と対向する金属層と、を備え、
前記接着層の形成材料は、第1の光硬化性樹脂と第2の光硬化性樹脂とを含み、
前記接着層の中で、前記第1の光硬化性樹脂は、第1の架橋密度を有し、
前記接着層の中で、前記第2の光硬化性樹脂は、前記第1の架橋密度よりも低い第2の架橋密度を有する
液晶積層体。 - 第1面と第2面とを有し、光透過性を有する基材と、
前記第2面に位置する光硬化性樹脂製の接着層と、
前記接着層のうち、前記基材に接する面とは反対側の面に位置する液晶層と、
前記基材に対して前記接着層とは反対側に位置し、かつ、前記第1面の一部と対向する金属層と、を備え、
前記接着層のうち、前記接着層の厚さ方向において、前記金属層と重なる部分が第1部分であり、前記金属層とは重ならない部分が第2部分であり、
前記接着層の中で、前記第1部分における光硬化性樹脂の架橋密度が、前記第2部分における前記光硬化性樹脂の架橋密度よりも高い
液晶積層体。 - 前記基材と前記金属層との間に位置して、前記基材と前記金属層とに接するとともに、前記基材に接する面とは反対側の面の少なくとも一部に回折構造を有する回折層をさらに備える
請求項1または2に記載の液晶積層体。 - 前記液晶層の形成材料は、コレステリック液晶の状態を示す化合物であり、
前記接着層の形成材料は、有機化合物を含み、
前記有機化合物が、トルエン、メチルイソブチルケトン、および、イソプロピルアルコールから構成される群から選択されるいずれか1つである
請求項1から3のいずれか一項に記載の液晶積層体。 - 第1面と第2面とを有し、光透過性を有する基材の第1面の一部と対向する金属層を形成することと、
前記基材と液晶層との間に、前記基材と前記液晶層とに接するとともに、光硬化性樹脂を含む前駆層を位置させることと、
前記前駆層に光を照射して前記前駆層を硬化させることによって、接着層を形成することと、を備え、
前記接着層の形成材料は、第1の光硬化性樹脂と第2の光硬化性樹脂とを含み、
前記接着層の中で、前記第1の光硬化性樹脂は、第1の架橋密度を有し、
前記接着層の中で、前記第2の光硬化性樹脂は、前記第1の架橋密度よりも低い第2の架橋密度を有する
液晶積層体の製造方法。 - 第1面と第2面とを有し、光透過性を有する基材の第1面の一部と対向する金属層を形成することと、
前記基材と液晶層との間に、前記基材と前記液晶層とに接するとともに、光硬化性樹脂を含む前駆層を位置させることと、
前記前駆層に光を照射して前記前駆層を硬化させることによって、接着層を形成することと、を備え、
前記接着層のうち、前記接着層の厚さ方向において、前記金属層と重なる部分が第1部分であり、前記金属層とは重ならない部分が第2部分であり、
前記接着層の中で、前記第1部分における光硬化性樹脂の架橋密度が、前記第2部分における前記光硬化性樹脂の架橋密度よりも高い
液晶積層体の製造方法。 - 前記前駆層を硬化させることでは、前記前駆層に対して前記金属層とは反対側から、前記前駆層に向けて光を照射する
請求項5または6に記載の液晶積層体の製造方法。
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