JP6524077B2 - 高硬度多層シート - Google Patents
高硬度多層シート Download PDFInfo
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- JP6524077B2 JP6524077B2 JP2016527358A JP2016527358A JP6524077B2 JP 6524077 B2 JP6524077 B2 JP 6524077B2 JP 2016527358 A JP2016527358 A JP 2016527358A JP 2016527358 A JP2016527358 A JP 2016527358A JP 6524077 B2 JP6524077 B2 JP 6524077B2
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Images
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- B32B2307/70—Other properties
- B32B2307/732—Dimensional properties
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Description
前記ポリメチルメタクリレート層(以下、PMMA層)は、(メタ)アクリル酸エステル系単量体75重量部〜88重量部、スチレン単量体2重量部〜5重量部、及びN−置換マレイミド単量体10重量部〜20重量部で形成されたアクリル系共重合体を含むことができる。
れるPMMA層樹脂組成物の量を常に均一に導入して押出量を正確に調節しなければならない。
2,2,6,6−テトラメチル−4−ピペリジル)イミノ]]、ジメチルスクシネートと4−ヒドロキシ−2,2,6,6,−テトラメチル−1−ピペリジンエタノール等を含むことができる。
前記ポリカーボネート層(以下、PC層)は、ポリカーボネート共重合体を含むことができる。前記ポリカーボネート共重合体は、特に構造的制限はなく、界面重合または溶融重合により形成され得る。例えば、前記ポリカーボネート共重合体として、LUPOY PC1201−08(LG化学)またはLUPOY PC 1300−30(LG化学)を用いることができる。
前記ポリメチルメタクリレート層と前記ポリカーボネート層が共押出されて形成され得る。共押出とは、一つ以上の押出機を用いて押出コーティング、フィルムまたはシートの作製時、一つ以上の層を加えてコーティングフィルム及びシートを作る方法を称する。前記共押出工程は、特に制限することはなく、一般の共押出工程により前記PMMA層及び前記PC層を形成することができる。
とする物性を具現するに適しており、前記PMMA層は、優れたスクラッチ特性と外観特性を具現し、前記PC層は、優れたタフネス(toughness)特性と耐熱性を具現でき、高硬度シートの物性を全体的に制御することができる。
りが発生し、このような反りは、タッチパネルの作動に問題を起こし得る。従って、高温、高湿の条件で一定水準以上の反りが発生すれば、タッチパネル用ウィンドウカバーに適用され得ない。例えば、温度85℃、湿度85%の条件で72時間の間放置した後、前記高硬度多層シートの反りは、約0.1mmであってよい。
PMMA−1(アクリル系共重合体)
メチルメタクリレート(MMA)83重量部、スチレン2重量部、N−シクロヘキシルマレイミド15重量部、連鎖移動剤としてn−オクチルメルカプタン0.2重量部、及び重合開始剤としてアゾビスイソブチロニトリル(AIBN)0.1重量部の混合液を分散剤水溶液(イオン交換水250重量部+重合分散剤2重量部)に投入して80℃で4時間の間重合し、110℃で2時間さらに重合して残留単量体を除去した後、乾燥して、ビーズ形態のPMMA−1(アクリル系共重合体)を製造した。前記PMMA−1の分子量は、13万であり、Tgは、132℃であった。
前記PMMA−1の製造方法でN−シクロヘキシルマレイミドをフェニルマレイミドに変更したことを除いては、PMMA−1と同様の方法でPMMA−2を製造した。前記PMMA−2の分子量は、12万であり、Tgは、133℃であった。
分子量が12万であり、Tgが104℃であるHP202(LG MMA社)を用いた。
溶融指数(300℃、1.2kg)が8.0であり、Tgが148℃であるLUPOY
PC 1201−08(LG化学)を用いた。
溶融指数(300℃、1.2kg)が30であり、Tgが144℃であるLUPOY PC 1300−30(LG化学)を用いた。
前記PMMA−1、PMMA−2及びPMMA−3に、下記表1のように添加剤(酸化防止剤及びUV安定剤)を添加した後、275℃で二軸押出機を通してペレット状にPMMA層樹脂組成物を形成した。また、前記PC−1及びPC−2に、下記表1のように添加剤(酸化防止剤及びUV安定剤)を添加した後、275℃で二軸押出機を通してペレット状にPC層樹脂組成物を形成した。その後、前記PMMA層樹脂組成物及び前記PC層樹脂組成物を共押出し、PMMA層及びPC層を含む高硬度多層シートを製造した。Scanning Electronic Microscope(SEM)を用いて、前記実施例及び比較例のPMMA層、PC層の厚さを測定した。
1)鉛筆硬度:ASTM D3363−05(三菱鉛筆、1kg荷重)を用いて、前記実施例及び比較例の硬度を測定した。
10:ポリメチルメタクリレート層
20:ポリカーボネート層
30:ハードコート層
Claims (11)
- (メタ)アクリル酸エステル系単量体75重量部〜88重量部、スチレン単量体2重量部〜5重量部、及びN−置換マレイミド単量体10重量部〜20重量部で形成されたアクリル系共重合体を含むポリメチルメタクリレート層;及び
ポリカーボネート共重合体を含むポリカーボネート層の積層構造である、高硬度多層シートであって、
前記アクリル系共重合体のガラス転移温度は、130℃〜140℃であり、前記ポリカーボネート共重合体の溶融指数は、3〜8である、前記高硬度多層シート。 - 前記ポリメチルメタクリレート層の厚さは、40μm〜70μmである、請求項1に記載の高硬度多層シート。
- 前記アクリル系共重合体の重量平均分子量は、10万〜15万である、請求項1又は2に記載の高硬度多層シート。
- 前記ポリメチルメタクリレート層は、アクリル系共重合体100重量部に対して、酸化防止剤0.1重量部〜1.5重量部、及びUV安定剤0.5重量部〜3.0重量部をさらに含む、請求項1〜3のいずれか1項に記載の高硬度多層シート。
- 前記ポリカーボネート層の厚さは、900μm〜950μmである、請求項1〜4のいずれか1項に記載の高硬度多層シート。
- 前記ポリカーボネート共重合体のガラス転移温度は、140℃〜150℃である、請求項1〜5のいずれか1項に記載の高硬度多層シート。
- 前記ポリカーボネート共重合体100重量部に対して、酸化防止剤0.3重量部〜2.0重量部、及びUV安定剤0.5重量部〜3.0重量部をさらに含む、請求項1〜6のいずれか1項に記載の高硬度多層シート。
- 前記ポリメチルメタクリレート層と前記ポリカーボネート層が共押出されて形成される、請求項1〜7のいずれか1項に記載の高硬度多層シート。
- 前記ポリメチルメタクリレート層の上部または前記ポリカーボネート層の下部にハードコート層をさらに含む、請求項1〜8のいずれか1項に記載の高硬度多層シート。
- 前記高硬度多層シートの鉛筆硬度が、4H以上である、請求項1〜9のいずれか1項に
記載の高硬度多層シート。 - 温度85℃、湿度85%の条件で72時間の間放置した後、前記高硬度多層シートの反りが、0.1mm以下である、請求項1〜10のいずれか1項に記載の高硬度多層シート
。
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