JP6300376B2 - 架橋型樹脂組成物、硬化物およびその製造方法 - Google Patents
架橋型樹脂組成物、硬化物およびその製造方法 Download PDFInfo
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- JP6300376B2 JP6300376B2 JP2014550995A JP2014550995A JP6300376B2 JP 6300376 B2 JP6300376 B2 JP 6300376B2 JP 2014550995 A JP2014550995 A JP 2014550995A JP 2014550995 A JP2014550995 A JP 2014550995A JP 6300376 B2 JP6300376 B2 JP 6300376B2
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- electron beam
- alicyclic olefin
- acrylate
- beam irradiation
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Description
以下、各成分について具体的に説明する。
本発明において、(A)脂環式オレフィン系樹脂として、公知の脂環式オレフィン系樹脂を使用することができ、脂環式オレフィン単量体に由来する構造を繰り返し単位として有する重合体樹脂であれば特に限定されない。例えば、ノルボルネン系重合体、ビニル脂環式炭化水素重合体、単環の環状オレフィン系重合体、環状共益ジエン系重合体およびその水素化物等が挙げられる。市販品としては、日本ゼオン社製のZEONEXシリーズ、ZEONORシリーズ、JSR社製のARTONシリーズ、三井化学社製のAPELシリーズ、APOシリーズなどがある。
本発明において、(B)炭素−炭素二重結合を有する有機化合物として公知慣用の化合物を使用することができる。炭素−炭素二重結合を有する有機化合物に電子線を照射すると、ラジカルカチオン等の活性種が生成されると考えられ、そのような活性種に起因して、架橋が起こっていると考えられる。
本発明の架橋型樹脂組成物は、上記各成分以外に、硬化性樹脂組成物に用いられるその他の成分を含んでいてもよい。その他の成分としては、溶剤、バインダー、着色剤、導電粉、表面処理剤、消泡剤、レベリング剤、表面張力低下剤、希釈剤、可塑化剤、フィラー、チキソトロピー剤、カップリング剤、安定剤、酸化防止剤、分散剤等が挙げられ、公知のものをいずれも使用可能である。本発明の架橋型樹脂組成物は電子線照射により硬化させることが出来るため、経済性、作業性の観点から紫外線硬化に用いられる光重合開始剤を含まない方が好ましい。
本発明の硬化物は、上記架橋型樹脂組成物を電子線照射により硬化することで得られるものである。低加速電圧が好ましくは30〜150kV、より好ましくは50〜100kVの電子線を、300〜800kGyの線量、50〜5000ppmの酸素濃度下で照射することが好ましい。低加速電圧が30kV以上の場合、硬化性が良好となる。低加速電圧が150kV以下の場合、基材にダメージを与えることを抑制できる。
本発明の硬化物の製造方法は、上記(A)脂環式オレフィン系樹脂および、(B)炭素−炭素二重結合を有する有機化合物を含有する組成物を電子線照射により硬化させる工程を含むことを特徴とするものである。低加速電圧が好ましくは30〜150kV、より好ましくは50〜100kVの電子線を、300〜800kGyの線量、50〜5000ppmの酸素濃度下で照射することが好ましい。電子線照射の方法は特に限定されず、エリアビーム型、カーテンビーム型、スキャニングビーム型、真空管型等の電子線照射装置を用いればよい。
(樹脂組成物の作製)
下記表1に示す割合で、各成分を混合し、三本ロールミルで練肉して、実施例1の架橋型樹脂組成物および比較例1の樹脂組成物を作製した。表中の配合量の単位は質量部である。
※2:トリシクロデカンジメタノールジアクリレート(新中村化学工業社製のNKエステルA−DCP)
実施例1の架橋型樹脂組成物の電子線照射によるIRスペクトルの変化を図1に示す。IRスペクトルはパーキンエルマージャパン社製FT−IR Spectrum100を用いて、ATR法によって測定した。比較として、比較例1の樹脂組成物(すなわち脂環式オレフィン系樹脂のみ)のIRスペクトル(電子線照射なし)を図1(a)に示す。図1(b)は、実施例1の架橋型樹脂組成物のIRスペクトル(電子線照射なし)を示す。図1(c)〜(e)はそれぞれ、実施例1の架橋型樹脂組成物に200kGy、300kGy、500kGyの電子線を照射した後のIRスペクトルを示す。
図1に示されるように、電子線の照射量の増加とともに、脂環式オレフィン系樹脂に特徴的な面内C−H変角(740cm−1)のピークが減少していることがわかる。また、照射量の増加とともに、アクリレートに起因する808、1404cm−1付近のピークが減少していることがわかる。これらの結果から、脂環式オレフィン系樹脂が、電子線照射により架橋されたことが示唆される。
図2に示されるように、電子線照射によるスペクトル変化は見られないことから、脂環式オレフィン系樹脂単体では電子線硬化していないと考えられる。
実施例1の架橋型樹脂組成物を、上記と同じ方法でそれぞれ200kGy、300kGy、500kGyの電子線を照射した後に、20mm×5mm×30μmの短冊状にして、DMS(動的粘弾性測定装置、エスアイアイナノテクノロジー社製DMS6100)を用いて、貯蔵弾性率E´、損失弾性率E″および損失正接tanδ(=E″/E´)を測定した結果を図3に示す。
図3の結果から、電子線の照射量の増加とともに、弾性率、および、ガラス転移温度(Tg)(=tanδ(=E″/E´)が極大値となる温度)が上昇しており、脂環式オレフィン系樹脂が電子線照射により架橋されたことが示唆される。図3から求まるガラス転移温度を、下記表2に示す。ガラス転移温度の上昇は、耐熱性が向上していることを示している。なお、比較例1の脂環式オレフィン系樹脂のみのものも測定したが、60℃付近でサンプルが伸びてしまい、測定値が得られなかった。
実施例1の架橋型樹脂組成物を、PETフィルムにアプリケーターにて塗布し、90℃×30分乾燥することで、基板上に塗膜を形成し、試験基板を得た。電子線照射後の塗膜(硬化物)の硬化性および耐溶剤性を確認するために、得られた試験基板について、上記と同様に電子線をそれぞれ0(未照射)、100、200、300、500kGy照射した後に、それぞれ1,2,3,4−テトラヒドロナフタレン(テトラリン)を用いてラビングテストを20回行った後、アセトンでリンスし、塗膜の溶解・剥がれを目視で確認した。評価基準は以下の通りである。結果を下記表3に示す。下記表3の結果から、電子線照射によって硬化性および耐溶剤性が向上していることがわかる。
○・・・テトラリンラビング後、塗膜の溶解・剥がれなし
△・・・テトラリンラビング後、塗膜表面に濁った部分あり
×・・・テトラリンラビング後、塗膜の溶解・剥がれあり
脂環式オレフィン系樹脂は高い離型性を有するが、層間絶縁膜等への応用の際には基材への密着性が課題となる。そこで下記のように、脂環式オレフィン系樹脂がアクリレートと架橋したことによる密着性への影響を確認した。
実施例1の架橋型樹脂組成物および比較例1の樹脂組成物を、PETフィルム(易接着面)上にアプリケーターでそれぞれ塗布し、次いで90℃で30分間加熱乾燥させて30μm厚の評価塗膜を作製した。実施例1の評価塗膜は上記と同様に電子線をそれぞれ0(未照射)、50、100、200、300、500kGy照射した後に、また、比較例1の評価塗膜は電子線を照射せずに、評価塗膜にカッターナイフで1mm×1mmの升目を100個作り、その上からセロハンテープを貼り付け、塗膜に対して90°でテープを剥離して、テープの付着物を目視で確認し、下記の基準で評価した。結果を下記表5に示す。下記表5の結果から、実施例1の架橋型樹脂組成物は、電子線照射によって密着性が向上すること、および、脂環式オレフィン系樹脂単体(比較例1)よりも密着性に優れた硬化物とすることができることが示された。
○:塗膜の剥がれなし
×:塗膜の剥がれあり
実施例1の架橋型樹脂組成物および比較例1の樹脂組成物を、それぞれ塗布、90℃×30分乾燥して、20mm×20mmの評価試料を得た。実施例1の評価試料については上記と同様に電子線を500kGy照射した後に、50℃に保たれた水に24時間浸漬した際の重量変化を測定した。比較例1の評価試料については、電子線照射せずに、同様に重量変化を測定した。結果を下記表6に示す。
低吸水性は脂環式オレフィン系樹脂組成物の特性の一つであるところ、下記表6の結果から、実施例1の架橋型樹脂組成物を電子線照射によって架橋しても、脂環式オレフィン系樹脂単体(比較例1)と同等の低吸水性であることが示された。上記ラビングテストの結果と併せて、電子線照射による架橋により耐溶剤性を向上させつつ、低吸水性を保持していることが示された。
本発明の架橋型樹脂組成物を電子線照射により硬化させた硬化膜は、有機TFTのゲート絶縁膜や層間絶縁材等の絶縁用途、レンズ、導光板、光学フィルム、光ディスク等の光学用途、医療用シリンジ、検査セル等の医療用途に利用することができる。
Claims (3)
- (A)極性基および不飽和結合のいずれも有さない脂環式オレフィン系樹脂、および、(B)多官能(メタ)アクリレート系化合物を含有する架橋型樹脂組成物であって、
前記(A)極性基および不飽和結合のいずれも有さない脂環式オレフィン系樹脂と前記(B)多官能(メタ)アクリレート系化合物の配合量比((A):(B))が、固形分及び質量部換算で、5:5〜9:1であることを特徴とする架橋型樹脂組成物。 - 請求項1に記載の架橋型樹脂組成物を電子線照射により硬化することによって得られることを特徴とする硬化物。
- (A)極性基および不飽和結合のいずれも有さない脂環式オレフィン系樹脂、および、(B)多官能(メタ)アクリレート系化合物を含有し、前記(A)極性基および不飽和結合のいずれも有さない脂環式オレフィン系樹脂と前記(B)多官能(メタ)アクリレート系化合物の配合量比((A):(B))が、固形分及び質量部換算で、5:5〜9:1である組成物を電子線照射により硬化させる工程を含むことを特徴とする硬化物の製造方法。
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R250 | Receipt of annual fees |
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R250 | Receipt of annual fees |
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R250 | Receipt of annual fees |
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