JP4931167B2 - 着色反射材、着色反射フィラーおよびこれらを用いた用途 - Google Patents
着色反射材、着色反射フィラーおよびこれらを用いた用途 Download PDFInfo
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- JP4931167B2 JP4931167B2 JP2004175771A JP2004175771A JP4931167B2 JP 4931167 B2 JP4931167 B2 JP 4931167B2 JP 2004175771 A JP2004175771 A JP 2004175771A JP 2004175771 A JP2004175771 A JP 2004175771A JP 4931167 B2 JP4931167 B2 JP 4931167B2
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- liquid crystal
- colored
- cholesteric liquid
- colored reflective
- crystal layer
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- RQGPLDBZHMVWCH-UHFFFAOYSA-N pyrrolo[3,2-b]pyrrole Chemical compound C1=NC2=CC=NC2=C1 RQGPLDBZHMVWCH-UHFFFAOYSA-N 0.000 description 1
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Images
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- Liquid Crystal (AREA)
- Paints Or Removers (AREA)
- Liquid Crystal Substances (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Optical Filters (AREA)
Description
−(CH2CH2O)a−(CH2)b−(O)c−、を示し、X2は−CNまたは−Fを示す。但し、一般式(2)中のaは0〜3の整数、bは0〜12の整数、cは0または1であり、かつa=1〜3のときはb=0、c=0であり、a=0のときはb=1〜12、c=0〜1である。)で表される化合物があげられる。
光重合性メソゲン化合物(高砂香料工業社製,L42)94.6重量部および重合性カイラル剤(BASF社製LC756)5.4重量部および溶媒(シクロペンタノン)233重量部を調整配合した溶液に、その固形分に対し、光重合開始剤(チバ・スペシャルティ・ケミカルズ社製,イルガキュア369)を2重量%添加した塗工液(固形分含有量20重量%)を調製した。当該塗工液を、延伸ポリエチレンテレフタレートフィルム(配向基材:東レ製ルミラー,38μm厚)上にワイヤーバーを用いて乾燥後の厚みで6μmとなるように塗設し、溶媒を100℃で2分間乾燥させた。得られた膜に、工程(1)として、液晶層側から120℃の空気雰囲気下で紫外線照射を30mW/cm2で、0.3秒間行った。次いで、工程(2)として、100℃の空気雰囲気下で2秒間熱処理を行った。さらに工程(1)、工程(2)を繰り返して行った。その後、工程(3)として、50℃の窒素雰囲気下で液晶層側から紫外線照射を60mW/cm2で、30秒間行い、コレステリック液晶フィルムを得た。コレステリック液晶フィルムの反射スペクトルを図5に示す。当該コレステリック液晶フィルムは、選択反射中心波長が460nm・帯域幅110nm、選択反射中心波長が830nm・帯域幅300nm、に2つの選択反射波長帯域を有していた。
実施例1で調製した塗工液の代わりに、配合を表1に示す割合に変えた塗工液を用いた。当該塗工液を、延伸ポリエチレンテレフタレートフィルム(配向基材)上にワイヤーバーを用いて乾燥後の厚みで12μmとなるように塗設し、溶媒を100℃で2分間乾燥させた。次いで、表1に示す条件で工程(1)乃至工程(3)を施しコレステリック液晶フィルムを得た。コレステリック液晶フィルムの反射スペクトルを図6に示す。当該コレステリック液晶フィルムは、選択反射中心波長が400nm・帯域幅90nm、選択反射中心波長が670nm・帯域幅220nm、に2つの選択反射波長帯域を有していた。
実施例1で調製した塗工液の代わりに、配合を表1に示す割合に変えた塗工液を用いた。当該塗工液を、延伸ポリエチレンテレフタレートフィルム(配向基材)上にワイヤーバーを用いて乾燥後の厚みで12μmとなるように塗設し、溶媒を100℃で2分間乾燥させた。次いで、表1に示す条件で工程(1)乃至工程(3)を施しコレステリック液晶フィルムを得た。広帯域コレステリック液晶フィルムの反射スペクトルを図7に示す。当該コレステリック液晶フィルムは、選択反射中心波長が470nm・帯域幅150nm、選択反射中心波長が830nm・帯域幅230nm、に2つの選択反射波長帯域を有していた。
選択反射中心波長が550nmのコレステリック液晶ポリマーを作製した。コレステリック液晶ポリマーは、重合性メソゲン化合物(BASF社製LC242)である液晶モノマーAと、重合性カイラル剤B(BASF社製LC756)を、モノマーA/カイラル剤B(配合重量比)=95.5/4.5、で配合した液晶混合物を重合することにより作製した。
実施例1で作製したコレステリック液晶フィルムをボールミルにて湿式粉砕し平均粒径50μmの鱗片状フィラーを得た。当該フィラー20重量部、紫外線硬化型樹脂(大日本インキ化学工業社製,ユニディック17−807)80重量部および紫外線重合開始剤(チバ・スペシャルティ・ケミカルズ社製,イルガキュア187)2重量部をトルエン中に分散させ、固形分濃度20重量%の塗工液を調製した。厚さ80μmのトリアセチルセルロースフィルム(富士写真工業社製,TD−TAC)上に前記塗工液をアプリケーターで塗布、乾燥した後、100℃で2分間加熱することにより塗膜を形成した。その後、紫外線照射器(ウシオ電機社製,UVC321AM1)にて50mW/平方センチ×1秒間の紫外線を照射して、塗膜を硬化し、厚み50μmの硬化塗膜を得た。得られた硬化塗膜は、入射角に応じて色調が変化する光学膜であった。
Claims (8)
- 単一層中に帯域幅が重複しない独立した選択反射波長帯域を少なくとも2つ有するコレステリック液晶層からなり、前記コレステリック液晶層は、厚み方向において、コレステリック捻れピッチ長が、不連続に存在する着色反射材を含有することを特徴とする着色反射フィラー。
- コレステリック液晶層は、厚み方向において、独立した選択反射波長帯域に対応するコレステリック捻れピッチ長が、不連続に存在することを特徴とする請求項1記載の着色反射フィラー。
- コレステリック液晶層は、少なくとも2つの独立した選択反射波長帯域による補色モードにより発色が得られるものであることを特徴とする請求項1または2記載の着色反射フィラー。
- 前記着色反射材の粉砕物を含有することを特徴とする請求項1〜3のいずれか一項に記載の着色反射フィラー。
- 少なくとも2種の着色反射材の粉砕物を含有することを特徴とする請求項4記載の着色反射フィラー。
- 請求項4または5記載の着色反射フィラーが、光透過性樹脂中に分散していることを特徴とする着色コーティング剤。
- 請求項6の着色コーティング剤から得られた反射フィルムまたはコーティング層。
- 請求項1〜5のいずれか一項に記載の着色反射フィラーまたは請求項6記載の着色コーティング剤の、装飾用途、化粧品もしくは医薬組成物用途、光学素子または防犯用途における使用。
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JP6238128B2 (ja) * | 2013-12-12 | 2017-11-29 | 国立大学法人東京工業大学 | 二帯域コレステリック液晶フィルム及びその製造方法 |
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