JP4963344B2 - 液晶分散型水溶性高分子溶液の製造方法、液晶分散型水溶性高分子複合フィルムの製造方法、液晶分散型水溶性高分子複合フィルム、偏光子、偏光板、光学フィルムおよび画像表示装置 - Google Patents
液晶分散型水溶性高分子溶液の製造方法、液晶分散型水溶性高分子複合フィルムの製造方法、液晶分散型水溶性高分子複合フィルム、偏光子、偏光板、光学フィルムおよび画像表示装置 Download PDFInfo
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- JP4963344B2 JP4963344B2 JP2004265154A JP2004265154A JP4963344B2 JP 4963344 B2 JP4963344 B2 JP 4963344B2 JP 2004265154 A JP2004265154 A JP 2004265154A JP 2004265154 A JP2004265154 A JP 2004265154A JP 4963344 B2 JP4963344 B2 JP 4963344B2
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- liquid crystal
- soluble polymer
- water
- polymer solution
- film
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Description
液晶性複屈折材料と透光性水溶性樹脂を溶媒に溶解した水溶性高分子溶液とを、液晶性複屈折材料が前記所定濃度よりも高濃度になるように、かつ、水溶性高分子溶液中の透光性水溶性樹脂100重量部に対して、液晶性複屈折材料の使用量が50重量部以下の範囲になるように調整した混合溶液を調製する工程(1)、
前記水溶性高分子溶液中に、前記液晶性複屈折材料が、最大粒径6μm以下の微小領域で分散するように、前記混合溶液を高剪断撹拌する工程(2)、
前記微小領域が分散した水溶性高分子溶液と、透光性水溶性樹脂を溶媒に溶解した水溶性高分子溶液を混合して、前記微小領域が、前記所定濃度になるように希釈化する工程(3)、および
前記希釈化した水溶性高分子溶液中の微小領域を均一に分散撹拌する工程(4)を含むことを特徴とする偏光子用液晶分散型水溶性高分子溶液の製造方法、に関する。
まず工程(1)で、液晶性複屈折材料と水溶性高分子溶液とを、液晶性複屈折材料が前記所定濃度よりも高濃度になるように調整した混合溶液を調製する。
工程(2)では、前記水溶性高分子溶液中に、前記液晶性複屈折材料が、最大粒径6μm以下の微小領域で分散するように、前記混合溶液を高剪断撹拌する。これにより、分散媒である水溶性高分子溶液中に液晶性複屈折材料を小径化した微小領域を均一分散させる。
前記工程(2)で得られた微小領域が分散した水溶性高分子溶液と、水溶性高分子溶液を混合して、前記微小領域が、前記所定濃度になるように希釈化する。
工程(4)では、前記希釈化した水溶性高分子溶液中の微小領域を均一に分散撹拌する。液晶性複屈折材料により形成された微小領域が最大粒径6μm以下に小径化し、所定濃度で水溶性高分子溶液中に分散している液晶分散型水溶性高分子溶液が得られる。
(II)前記(I)で得られたフィルムを配向(延伸)する工程、
(III)前記マトリクスとなる透光性水溶性樹脂に、ヨウ素系吸光体を分散させる(染色する)工程、
を施すことにより偏光子が得られる。なお、工程(I)乃至(III)の順序は適宜に決定できる。
得られた液晶分散型水溶性高分子溶液をガラス板にはさみ、偏光顕微鏡(ニコン(株)製のECLIPESE600POL)にてクロスニコル観察(40倍率)した。偏光顕微鏡画像の液晶性複屈折材料により形成された微小領域の粒径(平均粒径、最小粒径、最大粒径、分散)は、観察画像を画像処理により2値化して、解析ソフトで計測した。三谷商事(株)製のWin ROOFを使用した。なお、微小領域の粒径は、微小領域の最長長さをいう。
重合度2400、ケン化度99.9%のポリビニルアルコールを溶解した固形分13重量%のポリビニルアルコール水溶液と、メソゲン基の両末端に一つずつアクリロイル基を有する液晶性単量体(ネマチック液晶温度範囲が55〜75℃)とグリセリンを、ポリビニルアルコール:液晶性単量体:グリセリン=100:40:15(重量比)で、全量が260gになるように混合して、80℃(液晶温度範囲以上)に加熱して混合溶液を調製した。
重合度2400、ケン化度99.9%のポリビニルアルコールを溶解した固形分13重量%のポリビニルアルコール水溶液と、メソゲン基の両末端に一つずつアクリロイル基を有する液晶性単量体(ネマチック液晶温度範囲が55〜75℃)とグリセリンを、ポリビニルアルコール:液晶性単量体:グリセリン=100:5:15の重量比で、全量が2000gとなるように混合し、80℃(液晶温度範囲以上)に加熱して混合溶液を調製した。
重合度4000、ケン化度99.9%のポリビニルアルコールを溶解した固形分11重量%のポリビニルアルコール水溶液と、メソゲン基の両末端に一つずつアクリロイル基を有する液晶性単量体(ネマチック液晶温度範囲が55〜75℃)とグリセリンを、ポリビニルアルコール:液晶性単量体:グリセリン=100:30:15(重量比)で、全量が280gになるように混合して、80℃(液晶温度範囲以上)に加熱して混合溶液を調製した。
重合度4000、ケン化度99.9%のポリビニルアルコールを溶解した固形分11重量%のポリビニルアルコール水溶液と、メソゲン基の両末端に一つずつアクリロイル基を有する液晶性単量体(ネマチック液晶温度範囲が55〜75℃)とグリセリンを、ポリビニルアルコール:液晶性単量体:グリセリン=100:5:15の重量比で、全量が1630gとなるように混合し、80℃(液晶温度範囲以上)に加熱して混合溶液を調製した。
重合度2400、ケン化度99.9%のポリビニルアルコールを溶解した固形分13重量%のポリビニルアルコール水溶液と、メソゲン基の両末端に一つずつアクリロイル基を有する液晶性単量体A(ネマチック液晶温度範囲が55〜75℃)とグリセリンを、ポリビニルアルコール:液晶性単量体:グリセリン=100:30:15(重量比)で、全量が300gになるように混合して、80℃(液晶温度範囲以上)に加熱して混合溶液を調製した。
重合度2400、ケン化度99.9%のポリビニルアルコールを溶解した固形分13重量%のポリビニルアルコール水溶液と、メソゲン基の両末端に一つずつアクリロイル基を有する液晶性単量体A(ネマチック液晶温度範囲が55〜75℃)、メソゲン基の両末端に一つずつアクリロイル基を有する液晶性単量体B(ネマチック液晶温度範囲が50〜72℃)とグリセリンを、ポリビニルアルコール:液晶性単量体A:液晶性単量体B:グリセリン=100:30:30:15(重量比)で、全量が600gになるように混合して、80℃(液晶温度範囲以上)に加熱して混合溶液を調製した。
重合度2400、ケン化度99.9%のポリビニルアルコールを溶解した固形分13重量%のポリビニルアルコール水溶液と、メソゲン基の両末端に一つずつアクリロイル基を有する液晶性単量体A(ネマチック液晶温度範囲が55〜75℃)、メソゲン基の両末端に一つずつアクリロイル基を有する液晶性単量体B(ネマチック液晶温度範囲が50〜72℃)とグリセリンを、ポリビニルアルコール:液晶性単量体A:液晶性単量体B:グリセリン=100:30:30:15(重量比)で、全量が2910gになるように混合して、80℃(液晶温度範囲以上)に加熱して混合溶液を調製した。
Claims (5)
- 液晶性複屈折材料により形成された微小領域が、所定濃度で水溶性高分子溶液中に分散している偏光子用液晶分散型水溶性高分子溶液の製造方法であって、
液晶性複屈折材料と透光性水溶性樹脂を溶媒に溶解した水溶性高分子溶液とを、液晶性複屈折材料が前記所定濃度よりも高濃度になるように、かつ、水溶性高分子溶液中の透光性水溶性樹脂100重量部に対して、液晶性複屈折材料の使用量が50重量部以下の範囲になるように調整した混合溶液を調製する工程(1)、
前記水溶性高分子溶液中に、前記液晶性複屈折材料が、最大粒径6μm以下の微小領域で分散するように、前記混合溶液を高剪断撹拌する工程(2)、
前記微小領域が分散した水溶性高分子溶液と、透光性水溶性樹脂を溶媒に溶解した水溶性高分子溶液を混合して、前記微小領域が、前記所定濃度になるように希釈化する工程(3)、および
前記希釈化した水溶性高分子溶液中の微小領域を均一に分散撹拌する工程(4)を含むことを特徴とする偏光子用液晶分散型水溶性高分子溶液の製造方法。 - 前記混合溶液を高剪断撹拌する工程(2)を別々に複数回行って、それぞれに粒径が異なる微小領域が分散した水溶性高分子溶液を調製することを特徴とする請求項1記載の偏光子用液晶分散型水溶性高分子溶液の製造方法。
- 液晶性複屈折材料を少なくとも2種用いることを特徴とする請求項1または2記載の偏光子用液晶分散型水溶性高分子溶液の製造方法。
- 前記混合溶液を調製する工程(1)および希釈化する工程(3)で用いる水溶性高分子溶液が同種であることを特徴とする請求項1〜3のいずれかに記載の偏光子用液晶分散型水溶性高分子溶液の製造方法。
- 混合溶液を調製する工程(1)および希釈化する工程(3)で用いる水溶性高分子溶液の透光性水溶性樹脂が、重合度は1200〜10000、ケン化度は90〜100モル%のポリビニルアルコールであることを特徴とする請求項1〜4のいずれかに記載の偏光子用液晶分散型水溶性高分子溶液の製造方法。
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