JP6797352B2 - 接着剤、積層フィルム、及び積層フィルムの製造方法 - Google Patents
接着剤、積層フィルム、及び積層フィルムの製造方法 Download PDFInfo
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- JP6797352B2 JP6797352B2 JP2019553140A JP2019553140A JP6797352B2 JP 6797352 B2 JP6797352 B2 JP 6797352B2 JP 2019553140 A JP2019553140 A JP 2019553140A JP 2019553140 A JP2019553140 A JP 2019553140A JP 6797352 B2 JP6797352 B2 JP 6797352B2
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- Prior art keywords
- polyol
- polyisocyanate
- adhesive
- composition
- film
- Prior art date
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- 239000005056 polyisocyanate Substances 0.000 claims description 72
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- -1 amine compound Chemical class 0.000 claims description 68
- 239000000203 mixture Substances 0.000 claims description 68
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- 238000000576 coating method Methods 0.000 claims description 20
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- 229920005906 polyester polyol Polymers 0.000 claims description 16
- JBKVHLHDHHXQEQ-UHFFFAOYSA-N epsilon-caprolactam Chemical compound O=C1CCCCCN1 JBKVHLHDHHXQEQ-UHFFFAOYSA-N 0.000 claims description 13
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- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 6
- PXKLMJQFEQBVLD-UHFFFAOYSA-N bisphenol F Chemical compound C1=CC(O)=CC=C1CC1=CC=C(O)C=C1 PXKLMJQFEQBVLD-UHFFFAOYSA-N 0.000 description 6
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 description 6
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- 239000000377 silicon dioxide Substances 0.000 description 6
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 5
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- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 description 4
- FJKROLUGYXJWQN-UHFFFAOYSA-N 4-hydroxybenzoic acid Chemical compound OC(=O)C1=CC=C(O)C=C1 FJKROLUGYXJWQN-UHFFFAOYSA-N 0.000 description 4
- 229930185605 Bisphenol Natural products 0.000 description 4
- VZCYOOQTPOCHFL-OWOJBTEDSA-N Fumaric acid Chemical compound OC(=O)\C=C\C(O)=O VZCYOOQTPOCHFL-OWOJBTEDSA-N 0.000 description 4
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 4
- KKEYFWRCBNTPAC-UHFFFAOYSA-N Terephthalic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C=C1 KKEYFWRCBNTPAC-UHFFFAOYSA-N 0.000 description 4
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 4
- 150000007513 acids Chemical class 0.000 description 4
- WNLRTRBMVRJNCN-UHFFFAOYSA-N adipic acid Chemical compound OC(=O)CCCCC(O)=O WNLRTRBMVRJNCN-UHFFFAOYSA-N 0.000 description 4
- 125000002723 alicyclic group Chemical group 0.000 description 4
- 125000002947 alkylene group Chemical group 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- VEZXCJBBBCKRPI-UHFFFAOYSA-N beta-propiolactone Chemical compound O=C1CCO1 VEZXCJBBBCKRPI-UHFFFAOYSA-N 0.000 description 4
- DKPFZGUDAPQIHT-UHFFFAOYSA-N butyl acetate Chemical compound CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000007822 coupling agent Substances 0.000 description 4
- JHIVVAPYMSGYDF-UHFFFAOYSA-N cyclohexanone Chemical compound O=C1CCCCC1 JHIVVAPYMSGYDF-UHFFFAOYSA-N 0.000 description 4
- 239000000975 dye Substances 0.000 description 4
- 239000003822 epoxy resin Substances 0.000 description 4
- QQVIHTHCMHWDBS-UHFFFAOYSA-N isophthalic acid Chemical compound OC(=O)C1=CC=CC(C(O)=O)=C1 QQVIHTHCMHWDBS-UHFFFAOYSA-N 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 4
- BDJRBEYXGGNYIS-UHFFFAOYSA-N nonanedioic acid Chemical compound OC(=O)CCCCCCCC(O)=O BDJRBEYXGGNYIS-UHFFFAOYSA-N 0.000 description 4
- 239000005022 packaging material Substances 0.000 description 4
- 238000004806 packaging method and process Methods 0.000 description 4
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- 238000007789 sealing Methods 0.000 description 4
- CXMXRPHRNRROMY-UHFFFAOYSA-N sebacic acid Chemical compound OC(=O)CCCCCCCCC(O)=O CXMXRPHRNRROMY-UHFFFAOYSA-N 0.000 description 4
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- OZJPLYNZGCXSJM-UHFFFAOYSA-N 5-valerolactone Chemical compound O=C1CCCCO1 OZJPLYNZGCXSJM-UHFFFAOYSA-N 0.000 description 3
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 description 3
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 3
- XBDQKXXYIPTUBI-UHFFFAOYSA-M Propionate Chemical compound CCC([O-])=O XBDQKXXYIPTUBI-UHFFFAOYSA-M 0.000 description 3
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- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 3
- 239000012948 isocyanate Substances 0.000 description 3
- 150000002513 isocyanates Chemical class 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 description 3
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- NDKWCCLKSWNDBG-UHFFFAOYSA-N zinc;dioxido(dioxo)chromium Chemical compound [Zn+2].[O-][Cr]([O-])(=O)=O NDKWCCLKSWNDBG-UHFFFAOYSA-N 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
Classifications
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Description
加温せず25℃前後で短時間エージングを可能にする方法として、アミン触媒を用いる事が公知である。しかし、アミン触媒はそれ自身がポリイソシアネートとも反応性が高く、接着剤塗膜中に低分子量の3次元架橋物を形成する。これにより、接着剤塗膜を脆弱にし、ヒートシール強度、ラミネート強度を劣化させる傾向にあった。
しかし、いずれの方法も加温せず25℃前後での短時間エージングでは、所望するヒートシール強度、ラミネート強度が得られない問題があった。
本発明の接着剤は、ポリイソシアネート(A)を含むポリイソシアネート組成物(X)と、複数の水酸基を有する3級アミン化合物(B)、ポリオール(C)、及び脂肪族環状アミド化合物(D)を含有するポリオール組成物(Y)とを必須成分とする。
本発明で使用するポリイソシアネート(A)は、特に限定なく公知のものが使用出来る。例えば、トリレンジイソシアネート、2,4’ジフェニルメタンジイソシアネート(以下MDIと記載する場合がある)、2,2’MDI、4,4’MDI、1,5−ナフタレンジイソシアネート、トリフェニルメタントリイソシアネート、キシリレンジイソシアネート等の分子構造内に芳香族構造を持つポリイソシアネート、これらのポリイソシアネートのNCO基の一部をカルボジイミドで変性した化合物;これらのポリイソシアネートに由来するアルファネート化合物;イソホロンジイソシアネート、4,4’−メチレンビス(シクロヘキシルイソシアネート)、1,3−(イソシアナートメチル)シクロヘキサン等の分子構造内に脂環式構造を持つポリイソシアネート;1,6−ヘキサメチレンジイソシアネート、リジンジイソシアネート、トリメチルヘキサメチレンジイソシアネート等の直鎖状脂肪族ポリイソシアネート、及びこのアルファネート化合物;これらのポリイソシアネートのイソシアヌレート体;これらのポリイソシアネートに由来するアロファネート体;これらのポリイソシアネートに由来するビゥレット体;トリメチロールプロパン変性したアダクト体;前記した各種のポリイソシアネートとポリオール成分との反応生成物であるポリイソシアネートなどが挙げられる。
特に25℃前後での短時間エージングを可能にする点から、ポリイソシアネートの製造時の原料として使用するイソシアネートモノマーについて、4,4’MDIの比率が全原料中の38%以上を占める事が好ましい。
また滴定法(ジ−n−ブチルアミン使用)によるイソシアネート含有率が、5〜20質量%のものが、適正な樹脂粘度となって塗工性に優れる点から好ましい。
本発明においてポリオール組成物(Y)は、複数の水酸基を有する3級アミン化合物(B)、ポリオール(C)、及び脂肪族環状アミド化合物(D)を含有する。
前記複数の水酸基を有する3級アミン化合物(B)において、水酸基は2つ以上有することが必須であり、2〜6個有することが好ましい。また3級アミノ基は1つ以上有しておればよいが、好ましくは 1〜2個有していることが好ましい。
具体的には、ポリプロピレングリコールエチレンジアミンエーテル、トリ(1,2−ポリプロピレングリコール)アミン、N−エチルジエタノールアミン、N−メチル−N−ヒドロキシエチル−N−ヒドロキシエトキシエチルアミン、ペンタキスヒドロキシプロピルジエチレントリアミン、テトラキスヒドロキシプロピルエチレンジアミン、N,N,N’,N’−テトラキス(2−ヒドロキシプロピル)エチレンジアミン等が挙げられる。
一般に複数の水酸基を有する3級アミンは自己触媒作用を有するポリオールとなりえるが、3級アミンと水酸基が近傍している構造にあるため、触媒作用がより著しく働くと推定される。これにより硬化性が速くなると推定している。
本発明においては、3級アミン化合物(B)の有するヒドロキシル基は、第2級あるいは第3級であることが好ましい。第2級または第3級であることで、2液混合後の可使時間(ポットライフ)を維持することができ、また、2液を分別塗布する工程においても、圧着後のポリイソシアネート組成物(X)とポリオール組成物(Y)の混層を阻害することがない。
本発明において使用するポリオール(C)は、例えば、エチレングリコール、プロピレングリコール、1,3−プロパンジオール、1,4−ブタンジオール、1,5−ペンタンジオール、3−メチル−1,5−ペンタンジオール、1,6−ヘキサンジオール、ネオペンチルグリコール、メチルペンタンジオール、ジメチルブタンジオール、ブチルエチルプロパンジオール、ジエチレングリコール、トリエチレングリコール、テトラエチレングリコール、ジプロピレングリコール、トリプロピレングリコール、ビスヒドロキシエトキシベンゼン、1,4−シクロヘキサンジオール、1,4−シクロヘキサンジメタノール、
トリエチレングリコール等のグリコール;グリセリン、トリメチロールプロパン、ペンタエリスリトール等の3官能又は4官能の脂肪族アルコール;ビスフェノールA、ビスフェノールF、水素添加ビスフェノールA、水素添加ビスフェノールF等のビスフェノール;
ダイマージオール;前記グリコール、3官能又は4官能の脂肪族アルコール等の重合開始剤の存在下にエチレンオキサイド、プロピレンオキサイド、ブチレンオキサイド、スチレンオキサイド、エピクロルヒドリン、テトラヒドロフラン、シクロヘキシレン等のアルキレンオキシドを付加重合したポリエーテルポリオール;該ポリエーテルポリオールを更に前記芳香族又は脂肪族ポリイソシアネートで高分子量化したポリエーテルウレタンポリオール;プロピオラクトン、ブチロラクトン、ε−カプロラクトン、σ−バレロラクトン、β−メチル−σ−バレロラクトン等の環状エステル化合物の開環重合反応によって得られるポリエステルと前記グリコール、グリセリン、トリメチロールプロパン、ペンタエリスリトール等の多価アルコールとの反応物であるポリエステルポリオール(1);
前記グリコール、ダイマージオール、又は前記ビスフェノール等の2官能型ポリオールと、多価カルボン酸とを反応させて得られるポリエステルポリオール(2):
前記3官能又は4官能の脂肪族アルコールと、多価カルボン酸とを反応させて得られるポリエステルポリオール(3);2官能型ポリオールと、前記3官能又は4官能の脂肪族アルコールと、多価カルボン酸とを反応させて得られるポリエステルポリオール(4);ジメチロールプロピオン酸、ひまし油脂肪酸等のヒドロキシル酸の重合体である、ポリエステルポリオール(5);前記ポリエステルポリオール(1)〜(5)と前記ポリエーテルポリオールと芳香族若しくは脂肪族ポリイソシアネートとを反応させて得られるポリエステルポリエーテルポリオール前記ポリエステルポリオール(1)〜(5)を芳香族若しくは脂肪族ポリイソシアネートで高分子量化して得られるポリエステルポリウレタンポリオール;ポリエステルポリオール(1)〜(5)とポリエーテルポリオールとの混合物;ひまし油、脱水ひまし油、ひまし油の水素添加物であるヒマシ硬化油、ひまし油のアルキレンオキサイド5〜50モル付加体等のひまし油系ポリオール等が挙げられる。使用するポリオール(C)の重量平均分子量(Mw)は400〜5000が好ましい。
前記脂肪族環状アミド化合物(D)は、例えば、δ−バレロラクタム、ε−カプロラクタム、ω−エナントールラクタム、η−カプリルラクタム、β−プロピオラクタム等が挙げられる。これらの中でも低分子化学物質の溶出量低減の効果に優れる点からε−カプロラクタムが好ましい。その配合量はポリオール(C)100質量部あたり、脂肪族環状アミド化合物を0.1〜5.5質量部の範囲で混合させることが好ましい。また、ポリオール組成物(Y)100質量部あたり、脂肪族環状アミド化合物を0.1〜5質量部の範囲で混合させることが好ましい。
本発明の接着剤において、前記接着剤に含まれるアミン価は、0.5〜40mgKOH/gの範囲であることが好ましい。
ここでいうアミン価は、試料1gを中和するのに必要なHCl量に対して当量となるKOHのミリグラム数を意味し、特に制限はなく、公知の方法を用いて算出することができる。具体的には、例えば、以下に示す方法が好ましく挙げられる。
アミン化合物の化学構造、更に必要に応じて、平均分子量等がわかっている場合には、下記の計算式から算出できる。
アミン価が該範囲であると、実包性を確保しつつより優れた硬化性を得ることができる。アミン価は、中でも1.5〜35mgKOH/gの範囲が好ましく、1.5〜25mgKOH/gの範囲がなお好ましい。
本発明の接着剤は、イソシアネート基と水酸基との化学反応によって硬化する接着剤であり、無溶剤型の接着剤として使用することができる。なお本発明でいう無溶剤型の接着剤の「溶剤」とは、本発明で使用するポリイソシアネート(A)やポリオール(C)を溶解することの可能な、溶解性の高い有機溶剤を指し、「無溶剤」とは、これらの溶解性の高い有機溶剤を含まないことを指す。溶解性の高い有機溶剤とは、具体的には、トルエン、キシレン、塩化メチレン、テトラヒドロフラン、メタノール、エタノール、イソプロピルアルコール、酢酸メチル、酢酸エチル、酢酸n−ブチル、アセトン、メチルエチルケトン(MEK)、シクロヘキサノン、トルオール、キシロール、n−ヘキサン、シクロヘキサン等が挙げられる。中でもトルエン、キシレン、塩化メチレン、テトラヒドロフラン、酢酸メチル、酢酸エチルは特に溶解性の高い有機溶剤として知られている。
一方本発明の接着剤は、低粘度等の要求がある場合には、所望の粘度に応じて適宜前記溶解性の高い有機溶剤で希釈して使用してもよい。その場合は、ポリイソシアネート組成物(X)またはポリオール組成物(Y)のいずれか1つを希釈してもよいし両方を希釈してもよい。このような場合に使用する有機溶剤としては、例えばメタノール、エタノール、イソプロピルアルコール、酢酸メチル、酢酸エチル、酢酸n−ブチル、アセトン、メチルエチルケトン(MEK)、シクロヘキサノン、トルオール、キシロール、n−ヘキサン、シクロヘキサン等が挙げられる。これらの中でも溶解性の点から酢酸エチルやメチルエチルケトン(MEK)が好ましく、特に酢酸エチルが好ましい。有機溶剤の使用量は所要される粘度によるが概ね20〜50質量%の範囲で使用することが多い。
本発明の積層フィルムは、公知の方法で得ることができる。例えば本発明の接着剤であるポリイソシアネート(A)を含むポリイソシアネート組成物(X)と、複数の水酸基を有する3級アミン化合物(B)、ポリオール(C)、及び脂肪族環状アミド化合物(D)を含有するポリオール組成物(Y)とを含むポリオール組成物(Y)とを事前に混ぜ合わせた後、第一のプラスチックフィルムに塗布、次いで塗布面に第二のプラスチックフィルムを積層し、該接着剤層を硬化させて得る方法(製造方法1)や、前記ポリイソシアネート組成物(X)と、前記ポリオール組成物(Y)とを第一のプラスチックフィルム及び第二のプラスチックフィルムに別々に塗布後、該塗布面を接触させ圧着させる2液分別塗布工程により第一のプラスチックフィルムと第二のプラスチックフィルムとを積層させ、該接着剤層を硬化させて得る方法(製法方法2)が挙げられる。
中でも本発明においては、製造方法2、即ち、一方の基材に塗布されたポリイソシアネート(A)を含むポリイソシアネート組成物(X)と、他方の基材に塗布された複数の水酸基を有する3級アミン化合物(B)、ポリオール(C)、及び脂肪族環状アミド化合物(D)を含有するポリオール組成物(Y)とを含むポリオール組成物(Y)とが接触して圧着する2液分別塗布工程を有する方法(分別塗工ともいう)で行うと、本発明の接着剤の効果である優れた硬化性が最大限発揮することができ好ましい。
前記製造方法1の例としては、前記ポリイソシアネート組成物(X)と、前記ポリオール組成物(Y)とを予め混合した本発明の接着剤を、例えば、ロールコーター塗工方式で第一のプラスチックフィルムに塗布し、次いで、乾燥工程を経ることなく、他の基材を貼り合わせる方法が挙げられる。
塗工条件は、塗工設備に合った条件であればいずれの条件でも使用可能であるが、通常のロールコーターでは、25℃〜120℃程度まで加熱した状態で、本発明の接着剤の粘度を2500mPa・s以下とした状態で塗工することが好ましい。なお好ましい粘度範囲は、2000mPa・s以下である。また塗布量は、0.5〜5.0g/m2が好ましく、より好ましくは、1.0〜4.0g/m2程度で使用するのがよい。
前記製造方法2、いわゆる分別塗工の例としては、本発明の接着剤において、前記ポリイソシアネート組成物(X)と、前記ポリオール組成物(Y)とを第一のプラスチックフィルム及び第二のプラスチックフィルムに別々に塗布する。この際、例えば第一のプラスチックフィルムに前記ポリイソシアネート組成物(X)を塗布した場合は第二のプラスチックフィルムには前記ポリオール組成物(Y)を塗布する。また逆でもよい。その後両基材を貼り合わせることにより、A剤とB剤とが接触し、圧着させ反応が開始することにより、速やかに硬化が進行するものであるとともに、通常の2液混合型接着剤のような2液の混合が不要であり、従って2液混合後の可使時間(ポットライフ)を懸念する必要がなく、作業性に優れる。圧着方法はドライラミネーション(乾式積層法)により貼り合わせる方法が好ましく、ラミネートロールの温度は室温〜120℃程度、圧力は、3〜300kg/cm2程度が好ましい。このようにして軟包装フィルムを得ることができる。
分別塗工の場合は、貼り合わせ後の前記ポリイソシアネート組成物(X)と、前記ポリオール組成物(Y)の混層をより効率的に行うため、により低粘度で塗工することがのぞましい。具体的には粘度1000mPa・S以下で塗工することが好ましい。。またポリイソシアネート組成物(X)と、前記ポリオール組成物(Y)の塗布量は、それぞれ、0.5〜3.0g/m2が好ましく、より好ましくは、0.5〜2.0g/m2程度で使用するのが好ましい。
撹拌機、温度計、窒素ガス導入管を備えたフラスコに、4,4−MDIの36.5部、ヘキサメチレンジイソシアネートヌレート体の1部を反応容器内に仕込み、窒素ガス下で攪拌し、60℃まで加熱した。数平均分子量430の3官能プロピレングリコール(旭硝子株式会社製、EXCENOL 430)を4.3部、数平均分子量2000の2官能プロピレングリコール(三井化学ポリウレタン株式会社製、アクトコールD−2000)を53.2部、数回に分けて滴下し、5〜6時間攪拌しウレタン化反応を終了させた。
次に、ポリメリックMDIの5.0部(BASF INOAC ポリウレタン株式会社製 製品名:ルプラネートM20S)を反応容器内に投入した。得られたポリイソシアネートのNCO基含有率は、10.5%、40℃における溶融粘度は1500mPa.sであった。以下このポリイソシアネートを「A−1」と略記する。
尚、使用したポリメリックMDIは、環状MDIと4,4−MDIが60/40で構成される為、「A−1」に含まれる4,4−MDIの比率は38.5%となる。
ポリイソシアネート組成物については、「A−1」を使用した。ポリオール組成物については表1の配合に従って作成したB1〜B6を用いた。評価結果を表2に記す。下記の各種評価を行った。
積層フィルムの製造方法としては、製造方式(1)及び製造方式(2)で行った。
表2に記載した配合に従い調整したポリイソシアネート組成物(X)とポリオール組成物(Y)とを混合した接着剤を、調整後フィルムAに接着剤を塗布量が固形分2.0g/m2程度となるように塗布し、ラミネーターでこのフィルムAの塗布面とフィルムBとを貼り合せ、ヒートシール強度、ラミネート強度測定用の積層フィルムを作製した。
表2に記載した配合に従いポリイソシアネート組成物(X)とポリオール組成物(Y)をそれぞれ調整し、ポリイソシアネート組成物(X)をフィルムA、ポリオール組成物(Y)をフィルムBにそれぞれ塗布した後、フィルムAとフィルムBのお互いの塗布面をニップロール(ニップロール温度:50℃)で圧着し、プラスチックフィルム積層体を作製した。ポリイソシアネート組成物(X)とポリオール組成物(Y)のそれぞれの塗布量は、表1、表2に記載したポリイソシアネート組成物(X)とポリオール組成物(Y)の質量比に従い、合計で2.0g/m2になるようにした。加工速度は30m/minであった。
(ヒートシール強度)
フィルムAとしてナイロンフィルム(以下OPAフィルムと略記)、フィルムBとして直鎖低密度ポリエチレンフィルム(以下LLDPEフィルムと略記)を使用し、製造方式(1)、製造方式(2)に従いヒートシール強度測定用のラミネートフィルムを作製した。作製したラミネートフィルムはLLDPE面を向き合わせた上でOPAフィルム側から1cm幅のヒートシールバーを用いてプレスし、溶融接着させた。その際のヒートシール条件は、180度、0.1bar、1秒であった。ヒートシール部を15mm幅に切断し、ヒートシール強度を測定した。300mm/minの速度で測定した。ヒートシール強度の単位はN/15mmである。エージング温度は25度とした。エージング時間の短縮度合いを比較するためにラミネートフィルムを作製して1、3、5、24時間後におけるヒートシール強度を評価した。評価は5段階評価で以下のように行った。
5:50以上
4:40〜49
3:30〜39
2:20〜29
1:0〜19
ヒートシール強度評価同様、OPAフィルムとLLDPEフィルムのラミネート物でラミネート強度を評価した。300mm/minの速度で、T型剥離で評価した。ラミネート強度の測定単位はN/15mmである。1、3、5、24時間後におけるラミネート強度であり、評価は5段階評価で以下のように行った。
5:3以上
4:2.1〜3.0
3:1.1〜2.0
2:0.5〜1.0
1:0.5以下
・PPG−1000:ポリプロピレングリコール(三井化学ポリウレタン株式会社製、数平均分子量約1,000、水酸基価112mgKOH/g、40℃溶融粘度150mPa・s)
・PPG−2000:ポリプロピレングリコール(三井化学ポリウレタン株式会社製、数平均分子量約2,000、水酸基価56mgKOH/g、40℃溶融粘度150mPa・s)
・ひまし油:精製ひまし油(伊藤製油株式会社製、水酸基価160.5mgKOH/g、40℃溶融粘度250mPa・s )
・TEA:トリエチルアミン(株式会社ダイセル製)
・DEA:ジエチルアミン(株式会社ダイセル製)
・EDP300:N,N,N’,N’−テトラキス(2−ヒドロキシプロピル)エチレンジアミン
・ED−500:ポリプロピレングリコールエチレンジアミンエーテル
・TE−360:トリ(1,2−ポリプロピレングリコール)アミン
・εカプロラクタム:2−オキソヘキサメチレンイミン(関東化学株式会社製)
・δ−バレロラクタム:テトラヒドロ−2H−ピラン−2−オン(関東化学株式会社製)
・β−プロピオラクトン:2−オキセタノン(関東化学株式会社製)
・OFS−6040: 3−グリシジルオキシプロピルトリメトキシシラン(東レダウコーニング株式会社製)
・KBM903:3−アミノプロピルトリエトキシシラン(信越化学工業株式会社製)
これに対し、比較例1は複数の水酸基を有する3級アミン化合物(B)を含有しない例であるが、ヒートシール強度とラミネート強度が著しく低かった。
比較例2は水酸基を有さないアミン化合物のみを添加している組成であり、比較例1、2と同様にヒートシール強度とラミネート強度が低かった。
Claims (5)
- ポリイソシアネート(A)を含むポリイソシアネート組成物(X)と、複数の水酸基を有する3級アミン化合物(B)、ポリエステルポリオール、ポリエステルウレタンポリオール、ポリエーテルウレタンポリオール、ポリエーテルポリオール及びひまし油系ポリオールからなる群から選ばれる少なくとも1つのポリオール(C)、及び脂肪族環状アミド化合物(D)を含有するポリオール組成物(Y)とを必須成分とすることを特徴とする2液型接着剤。
- 前記接着剤のアミン価が0.5〜40mgKOH/gの範囲である請求項1に記載の2液型接着剤。
- 前記脂肪族環状アミド化合物(D)が、δ−バレロラクタム、ε−カプロラクタム、ω−エナントールラクタム、η−カプリルラクタム、β−プロピオラクタムからなる群から選ばれる請求項1または2に記載の2液型接着剤。
- 前記ポリイソシアネート組成物(X)を100としたときの前記ポリオール組成物(Y)の質量比が10〜150の範囲である請求項1〜3のいずれかに記載の2液型接着剤。
- 請求項1〜4のいずれかに記載の2液型接着剤が基材に塗布された積層フィルムの製造方法において、一方の基材に塗布されたポリイソシアネート(A)を含むポリイソシアネート組成物(X)と、他方の基材に塗布された複数の水酸基を有する3級アミン化合物(B)、ポリエステルポリオール、ポリエステルウレタンポリオール、ポリエーテルウレタンポリオール、ポリエーテルポリオール及びひまし油系ポリオールからなる群から選ばれる少なくとも1つのポリオール(C)、及び脂肪族環状アミド化合物(D)を含有するポリオール組成物(Y)とが接触して圧着する2液分別塗布工程を有することを特徴とする積層フィルムの製造方法。
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