JP7292651B2 - 光拡散性バリアフィルム - Google Patents
光拡散性バリアフィルム Download PDFInfo
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- JP7292651B2 JP7292651B2 JP2020557236A JP2020557236A JP7292651B2 JP 7292651 B2 JP7292651 B2 JP 7292651B2 JP 2020557236 A JP2020557236 A JP 2020557236A JP 2020557236 A JP2020557236 A JP 2020557236A JP 7292651 B2 JP7292651 B2 JP 7292651B2
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- layer
- light diffusion
- barrier film
- barrier
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- G02B5/0226—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures having particles on the surface
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Description
本出願は、2018年4月17日に提出された韓国特許出願第10-2018-0044337号及び2019年4月17日に提出された韓国特許出願第10-2019-0044610号に基づく優先権の利益を主張し、該当韓国特許出願の文献に開示されたすべての内容は本明細書の一部として組み込まれる。
水分透過度の変化率(%)={(B-A)/A}×100
下記実施例及び比較例のフィルムに対して比較された各物性は下記のように測定した。
光拡散層の表面の表面粗さは、AFM(原子間力顕微鏡,atomic force microscope)機器、例えば、Park Science社のXE7機器を用いてNon‐contact(vibrating)(非接触振動)方式で測定した。
製造された光拡散性バリアフィルムを幅が10cm、長さが10cmになるように裁断して試片を製造した。引き続き、面抵抗測定器(ハイレスタ-UP MCP‐HT450、Mitsubishi化学社)を用い、測定器の電極を2kgfの圧力で押した後、印加電圧500Vで面抵抗を測定した。それぞれ試片の幅方向の3個地点を10秒間測定して平均値を取った。
(1)水分透過度(10-3g/m2day)
実施例及び比較例で最終製造された光拡散性バリアフィルムの水分透過度であって、38℃及び100%の相対湿度下でAQUATRAN 2(MOCON社)を用いて測定した。
下記数式によって計算した。
水分透過度の変化率(%)={(B-A)/A}×100
製造された光拡散性バリアフィルムのヘイズ及び光透過度は、ヘイズメーター(hm‐150、Murakami color research laboratory社)を用いて測定した。
実施例1
1)基材層上に光拡散層形成
溶媒に対して光硬化性樹脂を20重量部で含む光拡散層のコーティング組成物を製造した。具体的に、ペンタエリスリトールトリアクリレート(PETA)80重量部、ジペンタエリスリトールヘキサアクリレート(DPHA)20重量部を溶媒(プロピレングリコールモノメチルエーテル)に溶解させた。前記溶液に重合開始剤(Irgacure 127、Ciba社)を4重量部、帯電防止剤(ELEC ME‐2、Kao社)5重量部、平均粒径0.8μmの粒子(MX80、Soken社)を10重量部で添加して光拡散層の組成物を調剤した。
光拡散層が形成された基材フィルムの反対面にペンタエリスリトールトリアクリレート(PETA)80重量部、ジペンタエリスリトールヘキサアクリレート(DPHA)20重量部を溶媒(プロピレングリコールモノメチルエーテル)に溶解させた。前記溶液に重合開始剤(Irgacure 127、Ciba社)を4重量部で添加してハードコーティング組成物を調剤した。バーコート方式で前記基材フィルムの光拡散層が形成されない面に塗膜を形成した後に100℃で2分間加熱乾燥させた後、UV光の照射を実施して厚さ1μmのハードコーティング層を形成した。
ポリシラザン(商品名NL120)をジブチルエーテルに溶解させた後、前記溶液をバーコート法により前記ハードコーティング層の基材フィルムが形成されない面に塗布した。得られた塗膜を70℃で1分間、130℃で2分間加熱乾燥し、厚さ150nmのバリア層を形成した(未硬化バリア層形成)。
上述した1)~3)の過程を経て形成された「光拡散層/基材層/ハードコーティング層/バリア層」の積層構造を有するフィルムを第1フィルム(F1)と称する。また、前記第1フィルム(F1)の製造と同一の過程を経て第2フィルム(F2)を追加製造した。第1フィルム(F1)のバリア層の表面上に第2バリアフィルム(F2)の光拡散層の凹凸表面が接触するように18kgの荷重を加えて第1及び第2フィルム(F1、F2)を重ねて、前記荷重を24時間の間維持した。このとき、前記第1及び第2フィルム(F1、F2)は、シート形状であり、接触する面積のサイズが10cm×10cmである。該当過程は、ロールツーロール過程で光拡散性バリアフィルムが巻き取られたときの過程と同様である。
第1フィルム(F1)に対してプラズマ処理を行ってバリア層を硬化させた。前記プラズマ処理は、約Ar:O2=1:1の流量(sccm基準)、約138mTorrの圧力、約0.27W/cm2の電力及び約20J/cm2のエネルギー条件下で行った。バリア層の硬化を最終に実施例1の光拡散性バリアフィルムを製造した。
光拡散層の組成物をコーティングするときにコーティングバーを異に用いたこと以外(#4 bar使用)は、実施例1と同一の方法で実施例2の光拡散性バリアフィルムを製造した。光拡散層の表面粗さ(Rt)値は、下記表の通りである。
帯電防止剤を使わないことと光拡散層の組成物をコーティングするときにコーティングバーを異に用いたこと以外(#3 bar使用)は、実施例1と同一の方法で実施例3の光拡散性バリアフィルムを製造した。光拡散層の表面粗さ(Rt)値は、下記表の通りである。
光拡散層の組成物で帯電防止剤を使わないことと実施例1で用いられた粒子の代わりに平均粒径が5μmである粒子(GB05S、Aica Kogyo社)を用いたこと以外(#5 barでコーティング)は、実施例1と同一の方法で実施例4の光拡散性バリアフィルムを製造した。光拡散層の表面粗さ(Rt)値は、下記表の通りである。
光拡散層の組成物をコーティングするときにコーティングバーを異に用いたこと以外(#4 bar使用)は、実施例4と同一の方法で実施例5の光拡散性バリアフィルムを製造した。光拡散層の表面粗さ(Rt)値は、下記表の通りである。
光拡散層の組成物をコーティングするときにコーティングバーを異に用いたこと以外(#3 barでコーティング)は、実施例4と同一の方法で実施例6の光拡散性バリアフィルムを製造した。光拡散層の表面粗さ(Rt)値は、下記表の通りである。
3)過程で加熱乾燥したバリア層の厚さを150nmの代わりに80nmにしたこと以外は、実施例6と同一の方法で実施例7の光拡散性バリアフィルムを製造した。光拡散層の表面粗さ(Rt)値は、下記表の通りである。
実施例3で製造された光拡散性バリアフィルムの硬化されたバリア層(第1バリア層)上に、実施例1で説明された3)過程と同一にポリシラザン組成物をコーティング乾燥した。その後、実施例1で説明された4)過程と5)過程を経て第1バリア層(硬化)と硬化された第2バリア層(硬化)(厚さ150nm)を含む実施例8の光拡散性バリアフィルムを製造した。光拡散層の表面粗さ(Rt)値は、下記表の通りである。
実施例1で用いられた粒子の代わりに平均粒径が20μmである粒子(MX‐2000、Soken社)を用いたこと、溶媒に対して光硬化性樹脂を50重量部で含む光拡散層のコーティング組成物を用いたこと、帯電防止剤を使わないこと、及び光拡散層の組成物コーティング時にナイフコーティングを用いたこと以外は、実施例1と同一の方法で比較例1の光拡散性バリアフィルムを製造した。光拡散層の表面粗さ(Rt)値は、下記表の通りである。
光拡散層のコーティング組成物で帯電防止剤を使わないこと以外は、実施例1と同一の方法で比較例2の光拡散性バリアフィルムを製造した。光拡散層の表面粗さ(Rt)値は、下記表の通りである。
光拡散層のコーティング組成物で帯電防止剤を使わないこと以外は、実施例2と同一の方法で比較例3の光拡散性バリアフィルムを製造した。光拡散層の表面粗さ(Rt)値は、下記表の通りである。
3)過程で加熱乾燥されたバリア層の厚さを150nmの代わりに80nmにしたこと以外は、比較例1と同一の方法で比較例4の光拡散性バリアフィルムを製造した。
11:第2サブバリア層
12:第1サブバリア層
20:基材層
30:光拡散層
40:ハードコーティング層
Claims (4)
- 基材層及び光拡散層を含み、前記基材層と対向する光拡散層の一面の反対面(S1)の表面粗さ(Rt)が0.1~6μmの範囲内である積層体を用意する第1ステップ、及び
前記光拡散層が形成された基材層の一面の反対面上にバリア層のコーティング組成物を塗布した後に乾燥してポリシラザン層を形成する第2ステップを含み、
光拡散性バリアフィルムの製造にロールツーロール工程を用い、
前記第2ステップの実行前に、前記第1ステップで用意された積層体をロール(R1)に巻き取るステップをさらに含み、
巻き取られた前記積層体を前記ロール(R1)から巻き出して前記第2ステップを行い、
前記第2ステップで用意された光拡散性バリアフィルムをロール(R2)に巻き取り、巻き取られた状態を1時間以上維持するステップをさらに含み、
巻き取られた前記光拡散性バリアフィルムを前記ロール(R2)から巻き出し、前記ポリシラザン層を硬化するステップをさらに含み、
下記数式で計算される水分透過度の変化率が30%以下を満たし、
[数式]
水分透過度の変化率(%)={(B-A)/A}×100
前記数式で、Aは、光拡散性バリアフィルム(F1)の水分透過度であり、Bは、光拡散性バリアフィルム(F1)のバリア層の表面上に光拡散性バリアフィルム(F2)の光拡散層の凹凸表面が接触するように一定荷重を加えて2個の光拡散性バリアフィルム(F1、F2)を重ね、前記一定荷重を24時間維持した後に測定された光拡散性バリアフィルム(F1)の水分透過度であり、前記光拡散性バリアフィルム(F1、F2)は、同一の構成を有し、前記水分透過度(A、B)は、38℃及び100%の相対湿度条件でAQUATRAN 2(MOCON社)を用いて測定されたことを特徴とする、光拡散性バリアフィルムの製造方法。 - 硬化性樹脂100重量部に対して0.1重量部以上の粒子を含む光拡散層のコーティング組成物を基材層の一面上に塗布した後に硬化して光拡散層を形成することを特徴とする、請求項1に記載の光拡散性バリアフィルムの製造方法。
- 前記ポリシラザン層の硬化は、プラズマ処理又はUV光の照射により行われることを特徴とする、請求項1から3のいずれか一項に記載の光拡散性バリアフィルムの製造方法。
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