JP3869482B2 - Water-dispersed release agent composition and release sheet - Google Patents

Water-dispersed release agent composition and release sheet Download PDF

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Publication number
JP3869482B2
JP3869482B2 JP00235896A JP235896A JP3869482B2 JP 3869482 B2 JP3869482 B2 JP 3869482B2 JP 00235896 A JP00235896 A JP 00235896A JP 235896 A JP235896 A JP 235896A JP 3869482 B2 JP3869482 B2 JP 3869482B2
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release agent
water
group
dispersed
release
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JPH09188868A (en
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倫久 上田
啓介 三宅
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Sekisui Chemical Co Ltd
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Sekisui Chemical Co Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は、水分散系離型剤組成物、及び、該水分散系離型剤組成物を用いて製せられた離型シートに関する。
【0002】
【従来の技術】
一般に、粘着テープ、粘着シート等の粘着加工品の粘着剤層は、使用時まで、粘着剤層を保護する目的で、保護シートが貼り付けられ、この保護シートは粘着加工品を使用する時に剥離される。従って、保護シートは粘着剤層から容易に剥離できることが必要であり、保護シートと粘着剤層との間の粘着力が強すぎるのは好ましくない。
【0003】
かかる観点より、保護シートと粘着剤層との剥離を容易にする目的で、通常、保護シートの粘着剤層との接触面には、離型剤が塗布されている。
【0004】
離型剤の役割は、粘着剤層の保護と粘着剤からの剥離を容易にすること以外に、剥離する時に、離型剤層が凝集破壊して、粘着剤層に移行し、粘着剤層の粘着力を低下させない性能、いわゆる、非移行性が要求される。更に、この非移行性は、時間が経過しても、温度が高い状態が続いても、実質的に変化しないことが要求される。
【0005】
離型剤としては、一般的に、ポリオルガノシロキサンからなるシリコーン系離型剤、ポリビニルアルコールの長鎖アルキル変性物、ポリエチレンイミンの長鎖アルキル変性物等が用いられており、これらは、通常、有機溶剤を溶媒とする溶液の形態で使用される。
【0006】
近年、安全環境上の問題から、無溶剤化が推進されており、水を溶媒とする水分散系離型剤や離型剤組成物を加熱溶融して用いるホットメルト型離型剤、ラジカル重合、カチオン重合、重縮合反応等により離型性モノマーを硬化させるモノマー型離型剤などの各種離型剤が検討されている。
【0007】
ホットメルト型離型剤やモノマー型離型剤は、基材上に薄く均一に塗布することが困難である為、水分散系離型剤が強く要求され、種々の提案がなされている。例えば、特開平3−86778号公報には、ポリビニルアルコール、ポリアリルアルコール又はその変性物とアルキルイソシアネートを反応させることによって得られる長鎖アルキルグラフトポリマーを後乳化することによって得られる水分散体を用いることを特徴とする水系離型剤が開示されている。又、特開平6−73351号公報には、ポリエチレンイミンなどのポリアミン化合物に長鎖アルキルイソシアネートを反応させ、この変性物を水に溶解、若しくは、分散させて得られる離型剤が開示されている。
【0008】
しかし、このような水系離型剤は、いずれも、離型性や非移行性を発現する為には、溶剤系の離型剤に比べて、塗布後長時間加熱しなければならないという問題点がある。又、そのようにして発現させた離型性や非移行性も、溶剤系の離型剤に比べて、不十分であり、これらの性能を向上させる為に組成を変えると、水系離型剤の貯蔵安定性が低下して、離型剤の凝集や沈降が起こったり、離型剤の水への分散そのものが困難になる等の問題点もある。
【0009】
【発明が解決しようとする課題】
本発明は、上記の如き従来の問題点を解消し、長期間にわたって、凝集や沈降を起こすことなく、溶剤系離型剤と同等の塗布量で、塗布後短時間の加熱・乾燥で、優れた離型性と非移行性が発現できる水分散系離型剤組成物、及び、該水分散系離型剤組成物を用いて製せられる離型シートを提供することを課題とする。
【0010】
【課題を解決するための手段】
本発明の水分散系離型剤組成物は、(a)アミノ基を有するポリアミン化合物の活性水素1当量に対し、(b)イソシアネート基、カルボキシル基、酸ハライド基、ケテン基、アルデヒド基、及び、エポキシ基からなる群より選ばれる少なくとも1種の活性水素反応性の官能基を有し、アルキル基の炭素数が6〜30である長鎖アルキル化合物を0.5当量以上の割合で反応させて得られる離型剤成分が、平均粒子径(レーザー回折光散乱法によりレーザー回折散乱式粒度分布計を用いて測定した粒子径分布曲線における下限もしくは上限からの頻度の累積値が50%になったところの粒子径)が1μm以下となるように水中に分散されて成ることを特徴とする。
【0011】
本発明の離型シートは、基材の少なくとも、片面に、請求項1に記載される水分散系離型剤から成る離型剤層が設けられていることを特徴とする。
【0012】
(a)アミノ基を有するポリアミン化合物とは、第1級アミノ基(−NH2 )及び/又は第2級アミノ基(−NH−)を含有するポリアミン化合物を意味し、活性水素とは、アミノ基の窒素原子に直接結合している水素原子、又は、該アミノ基によって活性が誘起されるα位の水素原子を意味する。
従って、活性水素を保有するアミノ基は、本発明に使用するポリアミン化合物の側鎖、主鎖いずれに含まれていても構わない。又、ポリアミン化合物には、アミノ基以外に起因する活性水素(例えば、−OH、−SH、−COOHなどに起因する活性水素)が、含まれていても何ら構わない。
【0013】
本発明のアミノ基を有するポリアミン化合物を、具体的に例示すると、ポリエチレンイミン、ポリプロピレンイミンなどのポリアルキレンイミン:ジエチレントリアミン、トリエチレンテトラミン、ペンタエチレンヘキサミン、エチレンジアミンなどのアルキル多価アミンとエピクロルヒドリンとの縮合物等のポリアルキレンポリアミン:アリルアミンの単独重合体、及び、エチレン、プロピレンなどのオレフィン、ブチルアクリレートなどの(メタ)アクリル酸アルキルエステル、(メタ)アクリルアミド、(メタ)アクリル酸、マレイン酸などの不飽和カルボン酸とその無水物、ビニルホスホン酸、ビニルピロリドン、アリルアルコールなどのビニルモノマーとアリルアミンとの共重合体:これらのポリアミン化合物にアルキレンオキシドを開環付加させた化合物:更に、これらのポリアミン化合物をヒドロキシアルキル(メタ)アクリレートにマイケル付加させた化合物などが挙げられる。これらのポリアミン化合物は単独で使用しても、2種以上を混合して使用しても何ら構わない。
【0014】
ポリアミン化合物の分子量(数平均分子量)は500〜100万の範囲が好ましく、更に、好ましくは、1000〜50万である。分子量が500未満のポリアミン化合物を用いて得られる離型剤成分は離型性能が悪く、100万を越えると、離型剤成分が水に分散し難くなる。
【0015】
ポリアミン化合物が含有するアミノ基の含有量は50モル%以上が良く、好ましくは、60モル%以上である。少な過ぎると、ポリアミン化合物の持つ活性水素が少ないことを意味し、この活性水素と反応する長鎖アルキル化合物の量が減少し、得られる離型剤成分の離型性能が悪化する。
【0016】
本発明に使用される離型剤成分の(b)成分として用いられる長鎖アルキル化合物は、イソシアネート基、カルボニル基、酸ハライド基、ケテン基、アルデヒド基及びエポキシ基からなる群より選ばれる少なくとも1種の活性水素反応性の官能基を有し、アルキル基の炭素数が6〜30、好ましくは8〜28である。アルキル基の炭素数が6未満であると、得られる離型剤成分の離型性能が不十分となり、逆にアルキル基の炭素数が30を超えると、(a)成分であるポリアミン化合物との反応性が低下する。
【0017】
かくして、(b)成分として用いられる長鎖アルキル化合物は、本発明を特に限定するものではないが、イソシアネート基を有するものとしては、ヘキシルイソシアネート、オクチルイソシアネート、ドデシルイソシアネート、オクタデシルイソシアネート、ドコサニルイソシアネート等が挙げられ、カルボキシル基を有するものとしては、オクタン酸、ドデカン酸、オクタデカン酸、ドコサン酸等が挙げられ、酸ハライド基を有するものとしては、オクタノイルクロライド、ドデカノイルクロライド、オクタデカノイルクロライド、オクタデシロイルクロライド、ドコサノイルクロライド等が挙げられ、ケテン基を有するものとしては、オクチルケテンダイマー、ドデシルケテンダイマー、オクタデシルケテンダイマー、ドコサニルケテンダイマー等が挙げられ、アルデヒド基を有するものとしては、ヘキシルアルデヒド、オクチルアルデヒド、ドデシルアルデヒド、オクタデシルアルデヒド、ドコサニルアルデヒド等が挙げられ、エポキシ基を有するものとしては、オクチルグリシジルエーテル、ドデシルグリシジルエーテル、オクタデシルグリシジルエーテル、ドコサニルグリシジルエーテル等が挙げられ、これらの少なくとも1種が好適に用いられる。
【0018】
本発明に使用される離型剤成分は、(a)成分であるポリアミン化合物に含有されるアミノ基に起因する活性水素1当量に対し、(b)成分である長鎖アルキル化合物が0.5当量以上、好ましくは0.6当量以上の割合で反応されて得られるものである。0.5当量未満であると、得られる離型剤成分の離型性が不十分となる。
【0019】
離型剤成分の合成方法は、特別な方法ではなく、溶媒中で、(a)成分であるポリアミン化合物の活性水素1当量に対し、(b)成分である長鎖アルキル化合物が0.5当量以上の割合で反応させて、所望の離型剤成分を得る事ができる。
離型剤成分の合成に用いる溶媒の種類は、特に限定されるものではないが、(b)成分である長鎖アルキル化合物が有する官能基の種類によって選択されることが好ましい。
【0020】
即ち、イソシアネート基やケテン基の場合は、トルエンやジメチルスルホキシド等の如きイソシアネート基、ケテン基と反応しない不活性溶媒を用いて、懸濁法や溶解法で反応を行う。カルボキシル基の場合は、トルエンのような通常のエステル化反応に用いられる溶媒を用い、酸ハライド基の場合は、酸ハライド基と反応しない不活性な溶媒を用いて反応を行うことが好ましく、この反応時には、ピリジンのような脱ハロゲン化水素剤を添加することがより好ましい。
【0021】
官能基がアルデヒド基の場合は、アルデヒド基と反応しない不活性な溶媒を用いて反応を行うことが好ましく、塩酸のような酸触媒を添加することがより好ましい。さらに、官能基がエポキシ基の場合は、エポキシ基と反応しない不活性な溶媒を用いて反応を行うことが好ましく、この反応時には、水酸化ナトリウムのようなアルカリ触媒を添加することがより好ましい。
【0022】
但し、(a)成分のポリアミン化合物の活性水素と(b)成分の長鎖アルキル化合物の官能基との反応が、長鎖アルキル化合物の官能基と水との反応より、充分に速い場合は、有機溶液でなくて、水溶液中で反応できる。
具体的には、ポリエチレンイミンとオクタデシルイソシアネートとの反応は水溶液で反応することができる。
【0023】
(a)成分と(b)成分との反応は、赤外吸収スペクトル等により、追跡でき、ポリアミン化合物の活性水素や長鎖アルキル化合物の官能基が消失した時点をもって終了とする。
【0024】
本発明の水分散系離型剤組成物には、離型剤成分の他に、水中に樹脂を容易に分散させたり、水分散系離型剤組成物を基材に塗布する際の濡れ性を向上させたり、塗工時の発泡を抑えたり、塗布後の離型剤膜強度を上げる為に、脂肪酸、酸変性ポリオレフィン(共)重合体、高沸点液状物質、界面活性剤、架橋剤などを目的に応じて、任意に添加しても構わない。
以下、本発明の水分散系離型剤組成物中に、離型剤成分以外に添加する上述の任意添加成分を、順次、説明する。
【0025】
脂肪酸は、炭素数が10〜30で、好ましくは12〜26であることが適当である。脂肪酸の炭素数が10未満であると、極性が高くなり過ぎて、該脂肪酸が離型剤成分と分離したり、融点を低くさせたりして、得られる水分散系離型剤組成物の離型性や非移行性を低下させる。逆に炭素数が30を超えると、極性が低くなり過ぎて、水に分散し難くなり、溶融粘度が高くなり過ぎて、得られる水分散系離型剤組成物を基材に塗布した後に、離型性や非移行性を発現させるためには、長時間の加熱を要し、作業工程の支障をきたす。
【0026】
炭素数が10〜30である脂肪酸としては、特に限定されるものではないが、例えば、ドデカン酸(ラウリン酸)、ヘキサデカン酸(パルミチン酸)、オクタデカン酸(ステアリン酸)、オクタデセン酸(オレイン酸)、イコサン酸(アラキジン酸)、ドコサン酸(ベヘン酸)等の飽和もしくは不飽和脂肪酸等が挙げられ、離型剤成分への配合に際し、これらの少なくとも1種が好適に使用される。
【0027】
尚、これらの脂肪酸は、水酸化ナトリウム、水酸化バリウム等のアルカリ金属やアルカリ土類の水酸化物の共存下では、脂肪酸が、当然、それらの塩となっているから、本発明での脂肪酸は、脂肪酸塩も含むものとする。
【0028】
脂肪酸の添加量は、特に限定されるものではないが、(a)成分と(b)成分とを反応させて得られる離型剤成分100重量部に対し、1〜50重量部であることが好ましく、更に好ましくは、3〜40重量部である。
脂肪酸の添加量が1重量部未満であると、水分散系離型剤組成物を製造する時、離型剤成分を水中に、均一で、安定的に、乳化分散させることが困難となり、得られる水分散系離型剤組成物を基材に塗布して、離型性、非移行性を発現させるためには、長時間の加熱を要するなど、作業工程の支障をきたす。
逆に、脂肪酸の添加量が50重量部を超えると、得られる水分散系離型剤組成物の非移行性が低下する。
【0029】
酸変性ポリオレフィン(共)重合体は、本発明の離型剤成分を水中に均一且つ安定に乳化分散させる機能を有し、酸価は0.2〜800の範囲が好ましく、更に好ましくは、10〜200である。酸価が0.2未満であると、それ自体の水中への分散が困難となり、逆に、酸価が800を超えると、離型剤成分と分離し易くなり、均一かつ安定な水分散系離型剤組成物を得ることが困難となる。
【0030】
酸変性ポリオレフィン(共)重合体としては、特に限定されるものではないが、エチレン、プロピレン、ブテン−1等のオレフィンとアクリル酸、メタクリル酸、マレイン酸、イタコン酸等の極性基を有するビニルモノマーとの共重合体、アクリル酸変性のポリエチレンワックス、化学的又は物理的に酸化処理されたポリエチレン、ポリプロピレン、ポリブテン等のポリオレフィン(共)重合体等が挙げられ、これらの少なくとも1種が好適に用いられる。
【0031】
酸変性ポリオレフィン(共)重合体に於いて、オレフィンと極性基を有するビニルモノマーとの共重合体の場合、共重合体中に占める極性基を有するビニルモノマーの含有量は、特に限定されるものではないが、0.01〜40モル%であることが好ましく、更に好ましくは、0.5〜10モル%である。
【0032】
酸変性ポリオレフィン(共)重合体の重合度は、特に限定されるものではないが、10〜2000であることが好ましく、さらに好ましくは、20〜1000である。重合度が10未満であると、常温に於いても軟化状態であるので、得られる水分散系離型剤組成物の離型性や非移行性が悪化する。逆に、重合度が2000を超えると、水への分散が困難となり、得られる水分散系離型剤組成物を基材に塗布して、離型性や非移行性を発現させるのに、長時間の加熱を要し、作業工程の支障をきたす。
【0033】
酸変性ポリオレフィン(共)重合体の融点及び溶融粘度は、特に限定されるものではないが、融点が40℃以上で、140℃に於ける溶融粘度が10000(Pa・s)以下であることが好ましく、なかでも、融点が60℃以上で、140℃に於ける溶融粘度が5000(Pa・s)以下であることがより好ましい。
融点が40℃未満であると、得られる水分散系離型剤組成物の離型性や非移行性が不十分となり、又、140℃に於ける溶融粘度が10000(Pa・s)を超えると、水に分散し難くなる。
かかる観点から、本発明を特に限定するものではないが、マレイン酸変性のポリエチレンワックスやアクリル酸変性のワックスが好適である。
【0034】
酸変性ポリオレフィン(共)重合体の添加量は、特に限定されるものではないが、(a)成分と(b)成分とを反応させて得られる離型剤成分100重量部に対し、1〜50重量部であることが好ましく、更に好ましくは、3〜40重量部である。
添加量が1重量部未満であると、水分散系離型剤組成物を製造する時、離型剤成分を水中に均一かつ安定に乳化分散させることが困難となり、得られる水分散系離型剤組成物を基材に塗布して、離型性や非移行性を発現させるのに、長時間の加熱を要し、作業工程の支障をきたす。逆に、添加量が50重量部を超えると、得られる水分散系離型剤組成物の非移行性が低下する。
【0035】
高沸点液状物質は、特に限定されるものではないが、常圧下の沸点が100℃以上であり、常温の粘度が100(Pa・s)以下であるものが好ましい。
又、粘着テープや粘着シート等の粘着加工品の粘着剤層に移行しても、粘着剤の粘着性能を著しく阻害しないものであることが好ましい。
沸点が100℃未満であると、得られる水分散系離型剤組成物を、塗布・乾燥する時に、揮発し易いので、排気、回収装置等が必要となり、製造コストアップにつながる。又、粘度が100(Pa・s)を超えると、流動性が低くなるので、水分散系離型剤組成物の濡れ性や造膜性を向上させる効果が乏しくなる。
【0036】
高沸点液状物質としては、特に限定されるものではないが、例えば、ナフテン系オイル、ラノリン、オレフィン類のオリゴマー、植物油、動物油、鉱物油等のプロセスオイル、液状ロジン、テレビン油等の液状粘着付与樹脂、ポリブテン、ジイソデシルフタレート等の可塑剤等が挙げられ、これらの少なくとも1種が好適に用いられる。
【0037】
界面活性剤としては、ノニオン系界面活性剤、アニオン系界面活性剤、カチオン系界面活性剤、両性系界面活性剤等のいずれも使用可能であり、これらの少なくとも1種が好適に用いられる。
【0038】
ノニオン系界面活性剤としては、例えば、ポリオキシエチレンアルキルフェニルエーテル、ポリオキシエチレンアルキルエーテルなどのエーテル型、グリセリン脂肪酸エステル、ソルビタン脂肪酸エステル、ショ糖脂肪酸エステル糖のエステル型、ポリエチレングリコール脂肪酸エステル、ポリオキシエチレンソルビタン脂肪酸エステル等のエステルエーテル型、脂肪酸アルカノールアミド型が挙げらる。
【0039】
アニオン系界面活性剤としては、例えば、脂肪酸モノカルボン酸塩、N−アシロイルグルタミン酸塩等のカルボン酸型、アルキルベンゼンスルホン酸塩、ナフタレンスルホン酸塩−ホルムアルデヒド縮合物、スルホ琥珀酸ジアルキルエステル等のスルホン酸型、硫酸アルキル塩等の硫酸エステル型、燐酸アルキル塩の燐酸エステル型等が挙げられる。
【0040】
カチオン系界面活性剤としては、例えば、アルキルアミン塩等のアミン塩型、アルキルトリメチルアンモニウム塩、ジアルキルジメチルアンモニウム塩、アルキルジメチルベンジルアンモニウム塩等の第4級アンモニウム塩型等が挙げられる。
【0041】
両性系界面活性剤としては、例えば、N,N−ジメチル−N−アルキルアミノ酢酸ベタイン等のカルボキシベタイン型、2−アルキル−1−ヒドロキシエチル−1−カルボキシメチルイミダゾリニウムベタイン等のグリシン型等が挙げられる。
【0042】
架橋剤は、水分散系離型剤組成物を基材に塗布して、造膜する時に、熱、光等で離型剤成分と反応し架橋させ得るものであれば良く、特に限定されるものではないが、例えば、多価イソシアネート化合物、ブロックド多価イソシアネート化合物、多価エポキシ化合物、多価アクリロイル化合物、多価メチロール化合物、多価イオン金属、多価アジリジン化合物等が挙げられ、これらの少なくとも1種が好適に用いられる。
【0043】
本発明の水分散系離型剤組成物に於いては、(a)成分と(b)成分とを反応させて得られる離型剤成分に、必要に応じて、脂肪酸、酸変性ポリオレフィン(共)重合体、高沸点液状物質、界面活性剤、架橋剤などの群から選ばれる添加剤成分が加えられるが、水中に分散される平均粒子径は、これらの各種添加剤成分も含めて、1μm以下となるように分散されていることが必要である。
尚、ここで言う平均粒子径とは、レーザー回折光散乱法により、レーザー回折散乱式粒度分布計(例えば、商品名「9220FRA」、MICROTRAC社製)を用いて測定した粒子径分布(粒度分布)曲線における下限もしくは上限からの頻度の累積値が50%になったところの粒子径を意味する。
【0044】
水に分散した離型剤成分の平均粒子径が1μmを越えると、離型シートの離型性や非移行性が低下したり、十分な離型性を発現させるのに、必要塗布量が増加したり、水分散系離型剤組成物の貯蔵安定性が損なわれる。
平均粒子径が大きいと、基材に塗工して、加熱・乾燥される工程で、水分散粒子が不安定となって、凝集し易くなり、粒子が基材を均一に被覆しない現象が起こることが観察された。
【0045】
本発明の水分散系離型剤組成物の製造方法としては、特に限定されるものではないが、例えば、離型剤成分を予め加熱溶融して、この加熱溶融物と水とを、例えば、加圧ニーダー、コロイドミル、高速攪拌シャフト等の混合機を用いて、高剪断をかけて平均粒子径が1μm以下となるまで均一に乳化分散させた後、分散粒子が融着凝集しないように冷却して、所望の水分散系離型剤組成物を得る方法(高圧乳化法)や、離型剤成分を予め有機溶剤に溶解し、その溶液と水とを、例えば、高速乳化機を用いて、高剪断をかけて平均粒子径が1μm以下となるまで均一に乳化分散させた後、有機溶剤を除去して、所望の水分散系離型剤組成物を得る方法(溶剤溶解法)等が挙げられ、いずれの方法も好適に採用されるが、なかでも有機溶剤の除去が不要で工程の簡略な高圧乳化法がより好適に採用される。
【0046】
高圧乳化法に於いて、離型剤成分の加熱溶融温度は、特に限定されるものではないが、120℃以上であることが好ましく、又、水の温度は、特に限定されるものではないが、加圧により100℃以上とされていることが好ましい。
又、離型剤成分を予め加熱溶融することなく、水中に一挙に投入し、加圧下120℃程度の温度で、高剪断をかけて平均粒子径が1μm以下となるまで均一に乳化分散させた後、冷却して所望の水分散系離型剤組成物を得る方法を採っても良い。
【0047】
高圧乳化法、若しくは、溶剤溶解法のいずれの方法に於いても、離型剤成分と水との混合割合は、特に限定されるものではないが、離型剤成分5〜50重量%、水95〜50重量%であることが好ましい。離型剤成分の含有量が5重量%未満であると、乳化分散時の剪断効果が減殺されて製造効率が低下し、逆に、離型剤成分の含有量が50重量%を超えると、粘度が高くなり過ぎて均一な乳化分散が困難となる。
又、乳化分散工程を経て得られた水分散系離型剤組成物は、貯蔵安定性が損なわれない範囲で必要に応じて、水で希釈されても良い。
【0048】
本発明の離型シートは、基材の少なくとも片面に、水分散系離型剤組成物が塗布・乾燥されて成る離型剤層が設けられていることが必要である。
【0049】
本発明の離型シートに用いられる基材としては、特に限定されるものではないが、ポリエチレン、ポリプロピレン、ポリエステル、セロファン等のプラスチックフィルム類、上質紙、クラフト紙、クレープ紙、グラシン紙等の紙類、含浸紙、プラスチックコート紙等の目止めを施した紙類、不織布、布等の布類等が挙げられ、これらの少なくとも1種を積層して使用しても構わない。
尚、基材は、水分散系離型剤組成物と基材との接着性を高めるために、その少なくとも片面に、コロナ処理、プラズマ処理、プライマー処理等の前処理が施されていることが好ましい。
【0050】
基材に水分散系離型剤組成物を塗布する方法としては、特別なものではなく、ロールコーター、グラビアコーター、メイヤーバーコーター、リップコーター等の一般的な塗布装置を用いて、基材の少なくとも片面に、水分散系離型剤組成物を塗布した後、例えば、加熱可能な乾燥炉を通して、加熱下で水分散系離型剤組成物の溶媒である水を揮散させ、乾燥する通常の塗布・乾燥工程を経ることにより行えば良い。
【0051】
基材の少なくとも片面に塗布する水分散系離型剤組成物の厚みは、特に限定されるものではないが、基材の片面につき、固形分で膜厚が1μm以下であることが好ましい。1μmを超えると、加熱・乾燥に長時間を要したり、コストアップになるばかりか、得られる離型剤層の非移行性も低下する。
【0052】
又、基材と離型剤成分との密着性をより高めて、得られる離型シートの離型性や非移行性を更に向上させる為に、上記乾燥工程の後に、水分散系離型剤組成物に対する加圧・加熱工程を設けることが好ましい。
基材の少なくとも片面に、塗布乾燥された離型剤成分を加圧・加熱することにより、微粒子状の離型剤成分は溶融、平滑化されると共に、基材との密着性も高まり、離型性や非移行性に優れた離型剤層を有する離型シートを得ることができる。
【0053】
離型剤成分を加圧・加熱する方法としては、例えば、水分散系離型剤組成物を塗布・乾燥した基材を、高温プレスの間に挟んで加圧しながら加熱する方法(プレス法)や、離型剤成分を塗布・乾燥した基材を加熱ロールの間を通して、加圧・加熱する方法(ロール法)等が挙げられ、いずれも好適に採用されるが、生産性に優れるロール法がより好適に採用される。
【0054】
加圧・加熱時の加熱温度は、特に限定されるものではないが、離型剤成分の軟化点より高い温度であることが好ましく、通常60℃以上、より好ましくは80℃以上である。
加圧・加熱時の圧力は、特に限定されるものではなく、基材の耐圧性に依存するが、通常0.01〜500Kg/cm2 であることが好ましい。
加圧・加熱時は、ロールと離型剤成分との密着性が、離型剤成分と離型シート基材との密着性より低いことが必要で、逆の場合は、溶融した離型剤成分がロールに転写して不都合である。従って、加熱ロールの材質としては、耐熱・離型性で、且つ、離型剤成分を均一に加圧する弾性材料が要求され、例えば、耐熱性シリコーンライニングゴムローラーや耐熱性テフロンライニングゴムローラー等が好ましく、いずれも好適に用いられている。
【0055】
生産性を向上させる為に、水分散系離型剤組成物の塗布・乾燥工程に続いて、加圧・加熱工程を設けるのが好ましいので、上記加熱ロールは、塗布・乾燥設備に連結して設置されることが好ましい。この場合、加熱ロールの周速度は、ライン速度と同調させるのが好ましいので、加熱ロールのロール径は、加圧・加熱工程に要する時間とライン速度とによって決定される。
【0056】
(作用)
本発明の水分散系離型剤組成物は、特定のポリアミン化合物と特定の長鎖アルキル化合物とを特定の割合で反応させて得られる離型剤成分が、必要に応じて、脂肪酸、酸変性ポリオレフィン(共)重合体、高沸点液状物質、界面活性剤、架橋剤から選ばれた特定の添加物と共に、平均粒子径が1μm以下となるように水中に分散されているので、離型剤成分の水中分散粒子が著しく安定で、長期間にわたって凝集や沈降が起こらず、貯蔵安定性に優れている。
それ故に、本発明の水分散系離型剤組成物を基材に塗布して、加熱・乾燥する過程に於いて、離型剤成分が局所的に凝集することなく、均一に離型剤成分の塗膜層を基材の上に形成することができる。
その理由は、顕微鏡観察により、離型剤成分の粒子が凝集することなく、均一充填・整列した状態を、離型シート基材上で、形成しながら、加熱・乾燥されて行くから、高濃度の離型剤成分の分散粒子と水とが分離して、効率的に水の蒸発が行われ、短時間の加熱・乾燥で、優れた離型性や非移行性を発現することができると推定される。
【0057】
【発明の実施の形態】
本発明をさらに詳しく説明するため、以下に実施例、比較例を挙げる。
【0058】
離型剤成分の合成
a)離型剤成分(R1、R1*、R2、R3、CR1、CR2)の合成
攪拌機、冷却器、滴下漏斗、温度計を備えた反応容器中に、ポリエチレンイミン(数平均分子量10000)10gを、脱水したトルエン150g中に分散させ、還流温度で、オクタデシルイソシアネート68gを加えて反応させた。反応の進行に伴い、ポリエチレンイミンの粉末が無くなって行くが、完全に消失してから、さらに2時間反応させた。その後、40℃まで冷却し、反応液を1000gのメタノール中に注いで、白色沈殿物を得る。これを、メタノールで洗浄し、次いで、ヘキサンで洗浄して、乾燥させて、離型剤成分(R1)を得た。
離型剤成分(R1*)は、上記R1の合成で、トルエンを水に変更した以外は同様な方法で行った。
R2、R3、CR1、CR2の離型剤成分も、表1に示す配合に従い、同様の方法で作製した。
【0059】
b)離型剤成分(R4)の合成
攪拌機、冷却器、滴下漏斗、温度計を備えた反応容器中に、ポリエチレンイミン(数平均分子量10000)10gを、脱水したピリジン300g中に分散させた。80℃で、オクタデシロイルクロライド81gを加え、ポリエチレンイミンと反応させた。反応の進行に伴い、ポリエチレンイミンの粉末が無くなって行くが、完全に消失してから、更に、2時間反応させた。その後、40℃まで冷却し、反応液を1500gのメタノール中に注いで、白色沈殿物を得た。これを、メタノールで洗浄し、次いで、ヘキサンで洗浄して、乾燥させて、離型剤成分(R4)を得た。
【0060】
実施例1
a)水分散系離型剤組成物の作製
離型剤成分(R−1)160g、ステアリン酸(炭素数18)30g、界面活性剤として、アルキルジフェニルエーテルジスルホン酸塩(商品名「ペレックスSS−L」、花王社製)5g及びポリオキシエチレンノニルフェニルエーテル(商品名「エマルゲン910」、花王社製)5g、及び、水800gを混合し、容量3リットルの高圧式乳化機に投入した後、温度120℃、攪拌速度500rpmで10分間攪拌し、離型剤成分(R−1)及びステアリン酸を溶融した。
次いで、130℃に昇温し、攪拌速度5000rpmで1時間高速攪拌して、乳化分散を行った後、冷却して、水分散系離型剤組成物を得た。
得られた水分散系離型剤組成物の安定性は、表2に示すように、長期間、沈降や、凝集が無く、安定で、その平均粒子径を、レーザー回折散乱式粒度分布計(商品名「9220FRA」、MICROTRAC社製)で測定したところ、0.30μmであった。
b)離型シートの作製
坪量75g/m2 のクルパッククラフト紙にポリエチレンを厚さ20μmとなるように押出しラミネートし、ポリエチレン面の表面張力が44dyn/cmになるように、コロナ処理して、テープ基材の目止め紙を得た。目止め紙のポリエチレンの側に、a)で得られた水分散系離型剤組成物を、固形分が3重量%となるように水で希釈し、#5のメイヤーバーコーターを用いて、乾燥後の膜厚が0.3μmとなるように塗布し、炉長1m、温度120℃の乾燥炉中に、ライン速度2m/分で、30秒間通させ、乾燥・造膜させて、離型シートを得た。
得られた離型シートに、粘着テープ(積水化学社製;クラフトテープ#504)を貼り付け、後述する方法で、各種性能を測定した結果、表2に示すように、比較例に比べ、良好な離型性能を有する離型シートが得られた。
又、該離型シートの製造過程を想定した条件、即ち、温度120℃、3秒後の乾燥途中にある離型膜の未完成状態を、表面反射電子顕微鏡写真で撮影した所、水分散系離型剤組成物の分散粒子が1.0μm以下で、テープ基材の上に、均一に被覆している状態が観察できた。
【0061】
実施例2
高圧式乳化機での処理時間を40分と変更した以外は実施例1と同様にして、水分散系離型剤組成物を作製した。平均粒子径は0.50μmであった。
又、実施例2の条件の水分散系離型剤組成物の離型シートを実施例1と同様な方法で、作製した。結果は表2に示すように、比較例に比べ、良好な離型性能を持つ離型シートが得られた。
【0062】
実施例3
ポリエチレンイミン(数平均分子量10000)10g、界面活性剤として、アルキルジフェニルエーテルジスルホン酸塩(商品名「ペレックスSS−L」、花王社製)2.5g及びポリオキシエチレンノニルフェニルエーテル(商品名「エマルゲン910」、花王社製)2.5g、反応触媒として、トリエチルアミン0.001g、イオン交換水40gを、攪拌機、冷却器、滴下漏斗、温度計を備えた反応容器中に投入し、この混合溶液を、室温で500rpmで攪拌しながら、60℃で溶融したオクタデシルイソシアネート68gを滴下漏斗から滴下して、反応させた。反応の進行に伴い、徐々に液が白濁し、白濁が始まってから、攪拌を4000回転に高速にして、更に、2時間反応させ、水分散系離型剤組成物を得た。この水分散系離型剤組成物は、表2のように、平均粒子径が0.55μmで、長期間、粒子の沈降、凝集が無く、安定であった。
この水分散系離型剤組成物を用い、実施例1と同様にして、離型シートを製作した。その結果、表2に示すように、比較例に比べ、良好な離型性能を持つ離型シートが得られた。
【0063】
実施例4〜実施例7
離型剤成分及び配合を、表2に示すように変更した以外は、実施例1と同様にして、水分散系離型剤組成物、離型シートを作製した。結果は表2のように、比較例に比べ、良好な離型剤性能を持つ離型シートが得られた。
【0064】
実施例8
平均塗布厚みを表2の如く、変更した以外は、実施例1と同様にして、水分散系離型剤組成物、離型シートを作製した。
その結果、表2に示すように、比較例に比べ、良好な離型性能を持つ離型シートが得られた。
しかし、平均塗布厚みが1.0μm以下である実施例1〜実施例6の方が、本実施例8の2.0μmより、非移行性(残存接着力)の点で優れていた。
【0065】
比較例1〜2
水分散系離型剤組成物の作製に於いて、高圧式乳化機中での高速攪拌時間を10分(比較例1)及び20分(比較例2)としたこと以外は、実施例1と同様にして2種類の水分散系離型剤組成物と2種類の離型シートを得た。
結果は、表3に示すように、水分散系離型剤組成物の安定性も悪く、平均粒子径が3.50μm(比較例1)と2.10μm(比較例2)で、離型シートの離型性能も劣っていた。
又、比較例1の水分散系離型剤組成物を基材に塗布し、乾燥(120℃、3分)過程中の未造膜状態で、該離型シートの表面反射顕微鏡写真を撮影したところ、離型剤粒子の粒子径は1μm以上の粗大状態で、凝集しており、基材を部分的にしか被覆していなかった。
【0066】
比較例3
乾燥・造膜後の平均塗布厚みを2.0μmにした以外は、比較例2と同様にして、離型シートを得た。
結果は表3に示すように、離型性能が劣っていた。
【0067】
比較例4、5
離型剤成分を、表3に示す如く、変更した以外は、実施例1と同様にして、離型シートを作製した。
その結果は、表3に示す如く、離型性能が劣っていた。
【0068】
比較例6、7
乾燥時間を表3に示すように、増加させた以外は、比較例1と同様にして、離型シートを作製した。
結果は、表3に示すように、若干性能は改善されたものの、実施例に比べ、離型性能は劣っていた。
【0069】
比較例8、9
平均塗布厚みを増加させ、乾燥時間を表3のようにした以外は、比較例1と同様にして、離型シートを作製した。
結果は、表3に示すように、塗布量の増大に伴い、乾燥・加熱に長時間を要し、性能は改善されたものの、実施例に比べ、不十分であった。
【0070】
比較例10
乾燥時間を表3に示すように増加した以外は、比較例1の水分散系離型剤組成物を用い、比較例4と同様にして、離型シートを作製した。
その結果、表3に示す様に、若干性能は改善されたものの、実施例に比べ、離型性能は劣っていた。
【0071】
参考例1〜参考例3
離型剤成分(R−1、2、3)の固形分を3重量%になるように、水でなく有機溶剤のトルエンで希釈し、実施例1と同様にして、目止め紙のポリエチレン面上に、#10のメイヤーバーコーターで、固形分で0.3g/m2 塗布し、実施例1と同じ乾燥炉で、120℃、30秒乾燥させ、離型シートを得た。
この離型紙に、粘着テープ(積水化学社製、クラフトテープ#504)を貼り付けて、各種の評価をした。結果は、表4に示す如く、実施例と同程度の良好な離型性能を有する離型シートが得られた。
以上のことから、実施例の水分散系離型剤組成物は、溶剤系の離型剤と同程度の性能を有し、有機溶剤の環境上の問題点が無い。
【0072】
【表1】

Figure 0003869482
【0073】
【表2】
Figure 0003869482
【0074】
【表3】
Figure 0003869482
【0075】
【表4】
Figure 0003869482
【0076】
水分散系離型剤組成物、離型シートの性能測定方法
表2、表3、表4に示す各種評価項目は下記の方法で行った。
貯蔵安定性
水分散系離型剤組成物を固形分が1重量%となるように、イオン交換水で希釈し、23℃の雰囲気下に72時間放置した後、凝集、沈降、層分離等の有無を目視で観察し、下記判定基準で貯蔵安定性を評価した。
又、水分散系離型剤組成物の水希釈液を200メッシュのステンレスフィルターで濾過し、濾過残渣を乾燥した後、その重量を測定し、23℃、72時間放置前の上記希釈液の全固形分に対する重量比(重量%)を求めた。
〔判定基準〕
○‥‥凝集、沈降、層分離のいずれも認められず、貯蔵安定性良好
△‥‥凝集、沈降、層分離が認められ、貯蔵安定性不十分
×‥‥乳化分散直後に凝集が発生し、水分散系離型剤組成物が得られなかった
【0077】
平均粒子径
レーザー回折散乱式粒度分布計(商品名「9220FRA」、MICROTRAC社製)を用いて、水分散系離型剤組成物を所定の濃度になるように希釈して、測定した。
【0078】
展開力
JIS Z−0237「粘着テープ・粘着シート試験方法」に準拠し、離型シートの離型面に、幅25mmの短冊状に裁断された粘着テープ(商品名「クラフトテープ#504」、積水化学社製)を圧着ローラーで貼り付けて試験片を作製し、23℃、65%RHの雰囲気下に24時間放置した後、同雰囲気下で、高速剥離試験機を用い、10m/分の剥離速度で、「180度引き剥がし試験」を行い、展開力(g/25mm)を求めた。展開力が低い程、離型シートの離型性が優れていることを示す。
【0079】
残存接着力
展開力の場合と同様の方法で作製した試験片を、23℃、65%RHの雰囲気下に24時間放置した後、粘着テープを離型シートから剥離した。次いで、JIS Z−0237に準拠し、剥離された粘着テープをステンレス板に圧着ローラーで貼り付け、23℃、65%RHの雰囲気下に24時間放置した後、同雰囲気下で、高速剥離試験機を用い、300mm/分の剥離速度で、「180度引き剥がし試験」を行い、剥離強度P(g/25mm)を測定した。
別途、離型シートに貼り付けなかった粘着テープを用い、同様にしてステンレス板に貼り付け、同様の条件で剥離強度を測定したところ、2010(g/25mm)であった。 両方の剥離強度の比〔(P/2010)×100〕を算出し、残存接着力(%)を求めた。残存接着力が100%に近い程、粘着剤層に対する離型剤成分の移行量が少ないことを示す。
【0080】
【発明の効果】
以上述べたように、本発明の水分散系離型剤組成物は、上記の如く構成されているので、貯蔵安定性に優れ、基材に塗布した後、短時間の加熱で、優れた離型性を発揮し、粘着剤層に離型剤成分が移行しない特性を発現できる。
又、本発明の離型シートは、上記の如き構成とされているので、離型剤層の離型性や粘着剤層への非移行性に優れており、主として、粘着テープや粘着シート等の粘着加工品用として、好適に用いられる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a water-dispersed release agent composition and a release sheet made using the water-dispersed release agent composition.
[0002]
[Prior art]
In general, the pressure-sensitive adhesive layer of pressure-sensitive adhesive products such as pressure-sensitive adhesive tapes and pressure-sensitive adhesive sheets is attached with a protective sheet for the purpose of protecting the pressure-sensitive adhesive layer until use, and this protective sheet is peeled off when using pressure-sensitive adhesive products. Is done. Therefore, the protective sheet needs to be easily peelable from the pressure-sensitive adhesive layer, and it is not preferable that the adhesive force between the protective sheet and the pressure-sensitive adhesive layer is too strong.
[0003]
From this viewpoint, a release agent is usually applied to the contact surface of the protective sheet with the pressure-sensitive adhesive layer for the purpose of facilitating the peeling between the protective sheet and the pressure-sensitive adhesive layer.
[0004]
In addition to protecting the adhesive layer and facilitating peeling from the adhesive, the role of the release agent is that when releasing, the release agent layer cohesively breaks down and moves to the adhesive layer. Performance that does not reduce the adhesive strength of the film, so-called non-migration is required. Furthermore, this non-migration is required to be substantially unchanged over time or even if the temperature continues to be high.
[0005]
As the release agent, generally, a silicone-based release agent composed of polyorganosiloxane, a long-chain alkyl-modified product of polyvinyl alcohol, a long-chain alkyl-modified product of polyethyleneimine, and the like are generally used. It is used in the form of a solution using an organic solvent as a solvent.
[0006]
In recent years, solvent-free solutions have been promoted due to problems in the safety environment. Hot-melt mold release agents and radical polymerization using water-dispersed mold release agents and release agent compositions with water as the solvent are used. Various release agents such as a monomer-type release agent that cures a release-type monomer by cationic polymerization, polycondensation reaction or the like have been studied.
[0007]
Since it is difficult to apply a hot melt type release agent and a monomer type release agent thinly and uniformly on a substrate, an aqueous dispersion type release agent is strongly required, and various proposals have been made. For example, JP-A-3-86778 uses an aqueous dispersion obtained by post-emulsifying a long-chain alkyl graft polymer obtained by reacting polyvinyl alcohol, polyallyl alcohol or a modified product thereof with alkyl isocyanate. An aqueous release agent characterized by this is disclosed. JP-A-6-73351 discloses a release agent obtained by reacting a long-chain alkyl isocyanate with a polyamine compound such as polyethyleneimine and dissolving or dispersing this modified product in water. .
[0008]
However, all of these water-based release agents must be heated for a long time after application compared to solvent-based release agents in order to exhibit releasability and non-migration. There is. In addition, the release property and non-migration property thus developed are insufficient as compared with the solvent-based release agent, and when the composition is changed to improve these performances, the aqueous release agent There are also problems such as a decrease in storage stability of the resin, aggregation and sedimentation of the release agent, and difficulty in dispersing the release agent in water.
[0009]
[Problems to be solved by the invention]
The present invention eliminates the conventional problems as described above, and does not cause aggregation or sedimentation over a long period of time, with an application amount equivalent to that of a solvent-based mold release agent, and is excellent in heating and drying in a short time after application. It is an object of the present invention to provide a water-dispersed release agent composition capable of exhibiting release properties and non-migrating properties, and a release sheet produced using the water-dispersed release agent composition.
[0010]
[Means for Solving the Problems]
The aqueous dispersion mold release agent composition of the present invention comprises (a) 1 equivalent of active hydrogen of a polyamine compound having an amino group, and (b) an isocyanate group, a carboxyl group, an acid halide group, a ketene group, an aldehyde group, and A long-chain alkyl compound having at least one active hydrogen-reactive functional group selected from the group consisting of epoxy groups and having 6 to 30 carbon atoms in the alkyl group is reacted at a ratio of 0.5 equivalents or more. The release agent component obtained in this way has an average particle size ((Particle diameter when the cumulative value of the frequency from the lower limit or the upper limit in the particle diameter distribution curve measured with a laser diffraction light scattering method using a laser diffraction / scattering particle size distribution meter is 50%)Is characterized by being dispersed in water so as to be 1 μm or less.
[0011]
The release sheet of the present invention is characterized in that a release agent layer made of the water-dispersed release agent described in claim 1 is provided on at least one side of the substrate.
[0012]
(A) A polyamine compound having an amino group is a primary amino group (—NH2) And / or a secondary amine group (—NH—), and the active hydrogen is a hydrogen atom directly bonded to the nitrogen atom of the amino group, or the amino group is active. This means an α-positioned hydrogen atom.
Therefore, the amino group having active hydrogen may be contained in either the side chain or the main chain of the polyamine compound used in the present invention. The polyamine compound may contain active hydrogen derived from other than the amino group (for example, active hydrogen derived from —OH, —SH, —COOH, etc.).
[0013]
Specific examples of the polyamine compounds having an amino group of the present invention include polyalkyleneimines such as polyethyleneimine and polypropyleneimine: condensation of alkyl polyvalent amines such as diethylenetriamine, triethylenetetramine, pentaethylenehexamine, and ethylenediamine with epichlorohydrin. Polyalkylene polyamines such as: homopolymers of allylamine, olefins such as ethylene and propylene, (meth) acrylic acid alkyl esters such as butyl acrylate, (meth) acrylamide, (meth) acrylic acid and maleic acid Copolymers of vinyl monomers such as saturated carboxylic acids and their anhydrides, vinylphosphonic acid, vinylpyrrolidone, allyl alcohol and allylamine: The ring-opening addition is not compounds: Furthermore, like these polyamine compounds hydroxyalkyl (meth) compound obtained by the Michael addition to acrylates. These polyamine compounds may be used alone or in combination of two or more.
[0014]
The molecular weight (number average molecular weight) of the polyamine compound is preferably in the range of 500 to 1,000,000, more preferably 1000 to 500,000. A release agent component obtained using a polyamine compound having a molecular weight of less than 500 has poor release performance, and if it exceeds 1,000,000, the release agent component is difficult to disperse in water.
[0015]
The content of amino groups contained in the polyamine compound is preferably 50 mol% or more, and preferably 60 mol% or more. If the amount is too small, it means that the polyamine compound has less active hydrogen, the amount of the long-chain alkyl compound that reacts with the active hydrogen is reduced, and the release performance of the resulting release agent component is deteriorated.
[0016]
The long-chain alkyl compound used as the component (b) of the release agent component used in the present invention is at least one selected from the group consisting of an isocyanate group, a carbonyl group, an acid halide group, a ketene group, an aldehyde group, and an epoxy group. It has an active hydrogen reactive functional group, and the alkyl group has 6 to 30 carbon atoms, preferably 8 to 28 carbon atoms. When the carbon number of the alkyl group is less than 6, the mold release performance of the obtained release agent component becomes insufficient. Conversely, when the carbon number of the alkyl group exceeds 30, the (a) component polyamine compound Reactivity is reduced.
[0017]
Thus, the long-chain alkyl compound used as the component (b) does not particularly limit the present invention. Examples of those having an isocyanate group include hexyl isocyanate, octyl isocyanate, dodecyl isocyanate, octadecyl isocyanate, and docosanyl isocyanate. Examples of those having a carboxyl group include octanoic acid, dodecanoic acid, octadecanoic acid, docosanoic acid, etc., and those having an acid halide group include octanoyl chloride, dodecanoyl chloride, octadecanoyl chloride, Examples include those having a ketene group, such as octyl ketene dimer, dodecyl ketene dimer, octadecyl ketene dimer, docosanyl ketene. Examples of those having an aldehyde group include hexyl aldehyde, octyl aldehyde, dodecyl aldehyde, octadecyl aldehyde, docosanyl aldehyde, etc., and those having an epoxy group include octyl glycidyl ether, dodecyl glycidyl ether, Examples include octadecyl glycidyl ether and docosanyl glycidyl ether, and at least one of these is preferably used.
[0018]
In the release agent component used in the present invention, the long-chain alkyl compound (b) is 0.5% of the active hydrogen attributed to the amino group contained in the polyamine compound (a). It is obtained by reacting at a ratio of not less than equivalent, preferably not less than 0.6 equivalent. If it is less than 0.5 equivalent, the release property of the obtained release agent component becomes insufficient.
[0019]
The method of synthesizing the release agent component is not a special method. In a solvent, the equivalent of active hydrogen of the polyamine compound (a) is 0.5 equivalent of the long-chain alkyl compound (b). By reacting at the above ratio, a desired release agent component can be obtained.
Although the kind of solvent used for the synthesis | combination of a mold release agent component is not specifically limited, It is preferable to select according to the kind of functional group which the long-chain alkyl compound which is (b) component has.
[0020]
That is, in the case of an isocyanate group or a ketene group, the reaction is carried out by a suspension method or a dissolution method using an inert solvent that does not react with an isocyanate group or ketene group such as toluene or dimethyl sulfoxide. In the case of a carboxyl group, it is preferable to use a solvent used in a normal esterification reaction such as toluene, and in the case of an acid halide group, the reaction is preferably performed using an inert solvent that does not react with the acid halide group. More preferably, a dehydrohalogenating agent such as pyridine is added during the reaction.
[0021]
When the functional group is an aldehyde group, the reaction is preferably performed using an inert solvent that does not react with the aldehyde group, and an acid catalyst such as hydrochloric acid is more preferably added. Furthermore, when the functional group is an epoxy group, the reaction is preferably performed using an inert solvent that does not react with the epoxy group, and at the time of this reaction, it is more preferable to add an alkali catalyst such as sodium hydroxide.
[0022]
However, when the reaction between the active hydrogen of the polyamine compound as the component (a) and the functional group of the long-chain alkyl compound as the component (b) is sufficiently faster than the reaction between the functional group of the long-chain alkyl compound and water, It can react in an aqueous solution, not an organic solution.
Specifically, the reaction between polyethyleneimine and octadecyl isocyanate can be performed with an aqueous solution.
[0023]
The reaction between the component (a) and the component (b) can be traced by an infrared absorption spectrum or the like, and ends when the active hydrogen of the polyamine compound or the functional group of the long-chain alkyl compound disappears.
[0024]
In addition to the release agent component, the water-dispersed release agent composition of the present invention can easily disperse the resin in water or wettability when the aqueous dispersion-based release agent composition is applied to a substrate. Fatty acids, acid-modified polyolefin (co) polymers, high-boiling liquid substances, surfactants, cross-linking agents, etc., to improve coating, suppress foaming during coating, and increase the strength of the release agent film after coating May be optionally added depending on the purpose.
Hereinafter, the above-mentioned optional addition components to be added in addition to the release agent component in the aqueous dispersion release agent composition of the present invention will be sequentially described.
[0025]
The fatty acid suitably has 10 to 30 carbon atoms, preferably 12 to 26 carbon atoms. When the number of carbon atoms of the fatty acid is less than 10, the polarity becomes too high and the fatty acid is separated from the release agent component or the melting point is lowered, so that the resulting aqueous dispersion release agent composition is released. Reduce moldability and non-migration. Conversely, if the number of carbons exceeds 30, the polarity becomes too low, it becomes difficult to disperse in water, the melt viscosity becomes too high, and after applying the obtained water dispersion type release agent composition to the substrate, In order to develop releasability and non-migrating property, heating for a long time is required, which hinders the work process.
[0026]
The fatty acid having 10 to 30 carbon atoms is not particularly limited. For example, dodecanoic acid (lauric acid), hexadecanoic acid (palmitic acid), octadecanoic acid (stearic acid), octadecenoic acid (oleic acid) And saturated or unsaturated fatty acids such as icosanoic acid (arachidic acid) and docosanoic acid (behenic acid), and at least one of these is preferably used in blending with the release agent component.
[0027]
These fatty acids are naturally salts thereof in the presence of alkali metal or alkaline earth hydroxide such as sodium hydroxide and barium hydroxide. Includes fatty acid salts.
[0028]
The addition amount of the fatty acid is not particularly limited, but may be 1 to 50 parts by weight with respect to 100 parts by weight of the release agent component obtained by reacting the components (a) and (b). Preferably, it is 3 to 40 parts by weight.
When the amount of fatty acid added is less than 1 part by weight, it becomes difficult to uniformly and stably emulsify and disperse the release agent component in water when producing an aqueous dispersion type release agent composition. In order to apply a water-dispersed release agent composition to a substrate to exhibit release properties and non-migratory properties, the work process is hindered, such as heating for a long time.
On the contrary, when the addition amount of the fatty acid exceeds 50 parts by weight, the non-migratory property of the obtained water dispersion mold release agent composition is lowered.
[0029]
The acid-modified polyolefin (co) polymer has a function of uniformly and stably emulsifying and dispersing the release agent component of the present invention in water, and the acid value is preferably in the range of 0.2 to 800, more preferably 10 ~ 200. If the acid value is less than 0.2, it is difficult to disperse itself in water. Conversely, if the acid value exceeds 800, it is easy to separate from the release agent component, and the water dispersion system is uniform and stable. It becomes difficult to obtain a release agent composition.
[0030]
The acid-modified polyolefin (co) polymer is not particularly limited, but a vinyl monomer having an olefin such as ethylene, propylene, and butene-1 and a polar group such as acrylic acid, methacrylic acid, maleic acid, and itaconic acid. Copolymer, acrylic acid-modified polyethylene wax, chemically or physically oxidized polyethylene, polypropylene (poly) polymer such as polybutene, etc., and at least one of these is preferably used. It is done.
[0031]
In the case of a copolymer of an olefin and a vinyl monomer having a polar group in an acid-modified polyolefin (co) polymer, the content of the vinyl monomer having a polar group in the copolymer is particularly limited. Although it is not, it is preferable that it is 0.01-40 mol%, More preferably, it is 0.5-10 mol%.
[0032]
The degree of polymerization of the acid-modified polyolefin (co) polymer is not particularly limited, but is preferably 10 to 2000, and more preferably 20 to 1000. When the degree of polymerization is less than 10, since it is in a softened state even at room temperature, the release property and non-migration property of the obtained water dispersion type release agent composition are deteriorated. On the other hand, when the degree of polymerization exceeds 2000, it becomes difficult to disperse in water, and the resulting aqueous dispersion mold release agent composition is applied to a base material to develop releasability and non-migration. Long heating is required, which hinders the work process.
[0033]
The melting point and melt viscosity of the acid-modified polyolefin (co) polymer are not particularly limited, but the melting point is 40 ° C. or more and the melt viscosity at 140 ° C. is 10,000 (Pa · s) or less. Among them, it is more preferable that the melting point is 60 ° C. or higher and the melt viscosity at 140 ° C. is 5000 (Pa · s) or lower.
When the melting point is less than 40 ° C., the resulting water-dispersed release agent composition has insufficient release properties and non-migration, and the melt viscosity at 140 ° C. exceeds 10,000 (Pa · s). It becomes difficult to disperse in water.
From this point of view, although the present invention is not particularly limited, maleic acid-modified polyethylene wax and acrylic acid-modified wax are preferred.
[0034]
The addition amount of the acid-modified polyolefin (co) polymer is not particularly limited, but 1 to 100 parts by weight of the release agent component obtained by reacting the component (a) and the component (b). The amount is preferably 50 parts by weight, and more preferably 3 to 40 parts by weight.
When the amount added is less than 1 part by weight, it becomes difficult to uniformly and stably emulsify and disperse the release agent component in water when producing an aqueous dispersion release agent composition. It takes a long time to apply the agent composition to the base material to develop releasability and non-migratory property, which hinders the work process. On the other hand, when the addition amount exceeds 50 parts by weight, the non-migratory property of the obtained water dispersion type release agent composition is lowered.
[0035]
The high boiling point liquid substance is not particularly limited, but preferably has a boiling point of 100 ° C. or higher under normal pressure and a viscosity at room temperature of 100 (Pa · s) or lower.
Moreover, even if it transfers to the adhesive layer of adhesive processing articles, such as an adhesive tape and an adhesive sheet, it is preferable that it does not inhibit the adhesive performance of an adhesive significantly.
When the boiling point is less than 100 ° C., the obtained water-dispersed release agent composition tends to volatilize when applied and dried, so that an exhaust, a recovery device and the like are required, leading to an increase in manufacturing cost. Moreover, since a fluidity | liquidity will become low when a viscosity exceeds 100 (Pa * s), the effect of improving the wettability and film forming property of a water-dispersed mold release agent composition will become scarce.
[0036]
The high-boiling liquid substance is not particularly limited, and examples thereof include naphthenic oils, lanolin, oligomers of olefins, process oils such as vegetable oils, animal oils and mineral oils, and liquid tackifying resins such as liquid rosin and turpentine oils. , Plasticizers such as polybutene and diisodecyl phthalate, and the like, and at least one of them is preferably used.
[0037]
As the surfactant, any of nonionic surfactants, anionic surfactants, cationic surfactants, amphoteric surfactants and the like can be used, and at least one of these is preferably used.
[0038]
Nonionic surfactants include, for example, ether types such as polyoxyethylene alkyl phenyl ether and polyoxyethylene alkyl ether, glycerin fatty acid ester, sorbitan fatty acid ester, ester type of sucrose fatty acid ester sugar, polyethylene glycol fatty acid ester, poly Examples include ester ether types such as oxyethylene sorbitan fatty acid esters, and fatty acid alkanolamide types.
[0039]
Examples of the anionic surfactant include carboxylic acid types such as fatty acid monocarboxylates and N-acyloyl glutamates, sulfones such as alkylbenzene sulfonates, naphthalene sulfonate-formaldehyde condensates, and sulfosuccinic acid dialkyl esters. Examples thereof include acid types, sulfate ester types such as alkyl sulfate salts, and phosphate ester types of alkyl phosphate salts.
[0040]
Examples of the cationic surfactant include amine salt types such as alkylamine salts, and quaternary ammonium salt types such as alkyltrimethylammonium salts, dialkyldimethylammonium salts, and alkyldimethylbenzylammonium salts.
[0041]
Examples of amphoteric surfactants include carboxybetaine types such as N, N-dimethyl-N-alkylaminoacetic acid betaine and glycine types such as 2-alkyl-1-hydroxyethyl-1-carboxymethylimidazolinium betaine. Is mentioned.
[0042]
The cross-linking agent is not particularly limited as long as it can react with the release agent component with heat, light, or the like to form a cross-linkage when a water-dispersed release agent composition is applied to a substrate to form a film. Although not a thing, For example, a polyvalent isocyanate compound, a blocked polyvalent isocyanate compound, a polyvalent epoxy compound, a polyvalent acryloyl compound, a polyvalent methylol compound, a polyvalent ion metal, a polyvalent aziridine compound etc. are mentioned, and these At least one is preferably used.
[0043]
In the water-dispersed release agent composition of the present invention, the release agent component obtained by reacting the component (a) and the component (b) may be added to a fatty acid, an acid-modified polyolefin (co-polymer) as necessary. ) Additive components selected from the group of polymers, high-boiling liquid substances, surfactants, cross-linking agents, etc. are added, but the average particle size dispersed in water is 1 μm including these various additive components. It is necessary to be distributed so that:
The average particle size referred to here is a particle size distribution (particle size distribution) measured by a laser diffraction light scattering method using a laser diffraction / scattering particle size distribution analyzer (for example, trade name “9220FRA”, manufactured by MICROTRAC). It means the particle diameter when the cumulative value of the frequency from the lower limit or the upper limit in the curve is 50%.
[0044]
When the average particle size of the release agent component dispersed in water exceeds 1 μm, the required amount of coating increases to reduce the release and non-migration properties of the release sheet or to develop sufficient release properties. Or the storage stability of the water-dispersed release agent composition is impaired.
If the average particle size is large, the water-dispersed particles become unstable and tend to aggregate in the process of applying to the substrate, heating and drying, and the phenomenon that the particles do not cover the substrate uniformly occurs. It was observed.
[0045]
The method for producing the water-dispersed release agent composition of the present invention is not particularly limited. For example, the release agent component is heated and melted in advance, and the heated melt and water are, for example, Using a mixer such as a pressure kneader, colloid mill, high-speed stirring shaft, etc., after high shear, uniformly emulsify and disperse until the average particle size becomes 1 μm or less, then cool so that the dispersed particles do not melt and aggregate. Then, a method for obtaining a desired water-dispersed release agent composition (high pressure emulsification method), a release agent component is dissolved in an organic solvent in advance, and the solution and water are used, for example, using a high-speed emulsifier. And a method (solvent dissolution method) of obtaining a desired water-dispersed release agent composition by uniformly emulsifying and dispersing until high-shear is applied until the average particle size is 1 μm or less, and then removing the organic solvent. Any of these methods are preferably employed, but the removal of the organic solvent is particularly preferable. A high-pressure emulsification method which is unnecessary and has a simple process is more preferably employed.
[0046]
In the high pressure emulsification method, the heating and melting temperature of the release agent component is not particularly limited, but is preferably 120 ° C. or higher, and the temperature of water is not particularly limited. The pressure is preferably 100 ° C. or higher.
Also, the release agent component was poured into water all at once without being heated and melted in advance, and was uniformly emulsified and dispersed at a temperature of about 120 ° C. under high pressure until the average particle size was 1 μm or less. Thereafter, a method of cooling to obtain a desired water-dispersed release agent composition may be employed.
[0047]
In either the high pressure emulsification method or the solvent dissolution method, the mixing ratio of the release agent component and water is not particularly limited, but the release agent component is 5 to 50% by weight, water. It is preferably 95 to 50% by weight. When the content of the release agent component is less than 5% by weight, the shearing effect at the time of emulsification and dispersion is diminished and the production efficiency is lowered. Conversely, when the content of the release agent component exceeds 50% by weight, The viscosity becomes too high and uniform emulsification and dispersion becomes difficult.
Moreover, the water-dispersed mold release agent composition obtained through the emulsification and dispersion step may be diluted with water as necessary as long as the storage stability is not impaired.
[0048]
In the release sheet of the present invention, it is necessary that a release agent layer formed by applying and drying a water-dispersed release agent composition is provided on at least one surface of a substrate.
[0049]
The substrate used in the release sheet of the present invention is not particularly limited, but plastic films such as polyethylene, polypropylene, polyester, cellophane, paper such as fine paper, kraft paper, crepe paper, glassine paper, etc. Examples thereof include: papers with seals such as impregnated paper and plastic-coated paper, and non-woven fabrics and cloths such as cloth. At least one of these may be laminated and used.
In addition, in order to improve the adhesiveness between the water-dispersed release agent composition and the substrate, the substrate may be subjected to pretreatment such as corona treatment, plasma treatment, and primer treatment on at least one surface thereof. preferable.
[0050]
The method for applying the water-dispersed release agent composition to the substrate is not a special one, and a general coating apparatus such as a roll coater, gravure coater, Mayer bar coater, lip coater, etc. After applying the water-dispersed release agent composition on at least one surface, for example, through a heatable drying furnace, the water which is the solvent of the water-dispersed mold release agent composition is volatilized under heating and dried. What is necessary is just to perform by passing through a coating and drying process.
[0051]
The thickness of the water-dispersed release agent composition applied to at least one surface of the substrate is not particularly limited, but it is preferable that the film thickness is 1 μm or less in terms of solid content on one surface of the substrate. If it exceeds 1 μm, it takes a long time for heating and drying, and the cost increases, and the non-migration of the obtained release agent layer also decreases.
[0052]
Further, in order to further improve the adhesion between the base material and the release agent component and further improve the release property and non-migration of the obtained release sheet, the aqueous dispersion release agent is used after the drying step. It is preferable to provide a pressurizing / heating step for the composition.
By applying pressure and heating to the at least one surface of the substrate, the release agent component that has been applied and dried is melted and smoothed, and the adhesiveness to the substrate is also increased. A release sheet having a release agent layer excellent in moldability and non-migration can be obtained.
[0053]
As a method for pressurizing and heating the release agent component, for example, a method in which a base material coated and dried with a water-dispersed release agent composition is sandwiched between high-temperature presses and heated while being pressed (press method) And a method in which a base material coated with a release agent component and dried is pressed and heated between heated rolls (roll method), and the like. Is more preferably employed.
[0054]
The heating temperature at the time of pressurization and heating is not particularly limited, but is preferably a temperature higher than the softening point of the release agent component, and is usually 60 ° C. or higher, more preferably 80 ° C. or higher.
The pressure at the time of pressurization and heating is not particularly limited and depends on the pressure resistance of the substrate, but is usually 0.01 to 500 Kg / cm.2It is preferable that
During pressurization / heating, the adhesiveness between the roll and the release agent component must be lower than the adhesiveness between the release agent component and the release sheet substrate, and in the opposite case, the molten release agent The component is inconvenient because it is transferred to a roll. Accordingly, the material of the heating roll is required to be heat-resistant and releasable and an elastic material that uniformly pressurizes the release agent component. For example, a heat-resistant silicone lining rubber roller or a heat-resistant Teflon lining rubber roller is used. Preferably, both are used suitably.
[0055]
In order to improve productivity, it is preferable to provide a pressurizing / heating step subsequent to the coating / drying step of the water-dispersed release agent composition, so the heating roll is connected to a coating / drying facility. It is preferable to be installed. In this case, since the peripheral speed of the heating roll is preferably synchronized with the line speed, the roll diameter of the heating roll is determined by the time required for the pressurization / heating process and the line speed.
[0056]
(Function)
The water-dispersed release agent composition of the present invention comprises a release agent component obtained by reacting a specific polyamine compound and a specific long-chain alkyl compound at a specific ratio. Because it is dispersed in water with a specific additive selected from a polyolefin (co) polymer, a high-boiling liquid substance, a surfactant, and a crosslinking agent so that the average particle size is 1 μm or less, a release agent component The particles dispersed in water are extremely stable, do not aggregate or settle for a long period of time, and have excellent storage stability.
Therefore, in the process of applying the water-dispersed release agent composition of the present invention to a substrate and heating and drying, the release agent component does not aggregate locally and is uniformly released. The coating layer can be formed on the substrate.
The reason for this is that, under microscopic observation, the particles of the release agent component are heated and dried while forming a uniformly packed and aligned state on the release sheet base material without agglomeration, so high concentration When the dispersed particles of the release agent component and water are separated, water is efficiently evaporated, and excellent release properties and non-migration properties can be expressed by heating and drying in a short time. Presumed.
[0057]
DETAILED DESCRIPTION OF THE INVENTION
In order to describe the present invention in more detail, examples and comparative examples are given below.
[0058]
Synthesis of release agent components
a)Synthesis of release agent components (R1, R1 *, R2, R3, CR1, CR2)
In a reaction vessel equipped with a stirrer, a cooler, a dropping funnel, and a thermometer, 10 g of polyethyleneimine (number average molecular weight 10,000) is dispersed in 150 g of dehydrated toluene and reacted at a reflux temperature by adding 68 g of octadecyl isocyanate. It was. As the reaction progressed, the polyethyleneimine powder disappeared, but after complete disappearance, the reaction was continued for another 2 hours. Then, it cools to 40 degreeC and pours a reaction liquid in 1000g of methanol, A white precipitate is obtained. This was washed with methanol, then washed with hexane, and dried to obtain a release agent component (R1).
The release agent component (R1 *) was synthesized in the same manner as in R1 except that toluene was changed to water.
R2, R3, CR1, and CR2 release agent components were also prepared in the same manner according to the formulation shown in Table 1.
[0059]
b)Synthesis of release agent component (R4)
In a reaction vessel equipped with a stirrer, a cooler, a dropping funnel, and a thermometer, 10 g of polyethyleneimine (number average molecular weight 10,000) was dispersed in 300 g of dehydrated pyridine. At 80 ° C., 81 g of octadecylyl chloride was added and reacted with polyethyleneimine. As the reaction progressed, the polyethyleneimine powder disappeared, but after complete disappearance, the reaction was further continued for 2 hours. Then, it cooled to 40 degreeC and poured the reaction liquid in 1500 g of methanol, and the white precipitate was obtained. This was washed with methanol, then washed with hexane, and dried to obtain a release agent component (R4).
[0060]
Example 1
a) Preparation of water-dispersed release agent composition
160 g of release agent component (R-1), 30 g of stearic acid (18 carbon atoms), 5 g of alkyl diphenyl ether disulfonate (trade name “Perex SS-L”, manufactured by Kao Corporation) and polyoxyethylene nonyl as a surfactant 5 g of phenyl ether (trade name “Emulgen 910”, manufactured by Kao Corporation) and 800 g of water were mixed and charged into a high-pressure emulsifier having a capacity of 3 liters, and then stirred for 10 minutes at a temperature of 120 ° C. and a stirring speed of 500 rpm. The release agent component (R-1) and stearic acid were melted.
Next, the temperature was raised to 130 ° C., the mixture was stirred at a high speed of 5000 rpm for 1 hour, emulsified and dispersed, and then cooled to obtain an aqueous dispersion release agent composition.
As shown in Table 2, the stability of the obtained water-dispersed mold release agent composition is stable for a long period of time without sedimentation or aggregation, and the average particle size is determined by a laser diffraction scattering particle size distribution meter ( It was 0.30 μm when measured by a trade name “9220FRA” (manufactured by MICROTRAC).
b) Production of release sheet
Basis weight 75g / m2Polypropylene was extruded and laminated to a thickness of 20 μm on the Kurpack kraft paper, and corona-treated so that the surface tension of the polyethylene surface was 44 dyn / cm to obtain a sealing paper for a tape base material. On the polyethylene side of the sealing paper, the water-dispersed release agent composition obtained in a) is diluted with water so that the solid content becomes 3% by weight, and using a # 5 Meyer bar coater, It is applied so that the film thickness after drying is 0.3 μm, and it is passed through a drying furnace with a furnace length of 1 m and a temperature of 120 ° C. at a line speed of 2 m / min for 30 seconds, followed by drying and film formation. A sheet was obtained.
Adhesive tape (manufactured by Sekisui Chemical Co., Ltd .; Kraft tape # 504) was applied to the obtained release sheet, and various performances were measured by the methods described below. As a result, as shown in Table 2, it was better than the comparative example. A release sheet having a good release performance was obtained.
In addition, the conditions assuming the production process of the release sheet, that is, the temperature of 120 ° C., an unfinished state of the release film in the middle of drying after 3 seconds, was photographed with a surface reflection electron micrograph, an aqueous dispersion system The dispersed particles of the release agent composition were 1.0 μm or less, and it was observed that the tape substrate was uniformly coated.
[0061]
Example 2
A water dispersion mold release agent composition was prepared in the same manner as in Example 1 except that the treatment time in the high-pressure emulsifier was changed to 40 minutes. The average particle size was 0.50 μm.
Further, a release sheet of the aqueous dispersion type release agent composition under the conditions of Example 2 was produced in the same manner as in Example 1. As shown in Table 2, a release sheet having better release performance was obtained as compared with the comparative example.
[0062]
Example 3
10 g of polyethyleneimine (number average molecular weight 10,000), 2.5 g of alkyl diphenyl ether disulfonate (trade name “Perex SS-L”, manufactured by Kao Corporation) as a surfactant and polyoxyethylene nonylphenyl ether (trade name “Emulgen 910”) ”, Manufactured by Kao Co., Ltd.) 2.5 g, 0.001 g of triethylamine and 40 g of ion-exchanged water as reaction catalysts were put into a reaction vessel equipped with a stirrer, a cooler, a dropping funnel and a thermometer, and this mixed solution was While stirring at 500 rpm at room temperature, 68 g of octadecyl isocyanate melted at 60 ° C. was dropped from the dropping funnel and allowed to react. As the reaction progressed, the liquid gradually became cloudy, and when clouding began, stirring was increased to 4000 rpm and the reaction was further continued for 2 hours to obtain an aqueous dispersion release agent composition. As shown in Table 2, this water-dispersed mold release agent composition had an average particle size of 0.55 μm and was stable without sedimentation or aggregation of particles for a long period of time.
Using this water-dispersed release agent composition, a release sheet was produced in the same manner as in Example 1. As a result, as shown in Table 2, a release sheet having better release performance was obtained as compared with the comparative example.
[0063]
Example 4 to Example 7
A water-dispersed release agent composition and a release sheet were prepared in the same manner as in Example 1 except that the release agent component and the formulation were changed as shown in Table 2. As a result, as shown in Table 2, a release sheet having better release agent performance was obtained as compared with the comparative example.
[0064]
Example 8
A water-dispersed release agent composition and a release sheet were prepared in the same manner as in Example 1 except that the average coating thickness was changed as shown in Table 2.
As a result, as shown in Table 2, a release sheet having better release performance was obtained as compared with the comparative example.
However, Examples 1 to 6 having an average coating thickness of 1.0 μm or less were superior to 2.0 μm of Example 8 in terms of non-migration (residual adhesive force).
[0065]
Comparative Examples 1-2
In the preparation of the water-dispersed release agent composition, Example 1 and Example 1 except that the high-speed stirring time in the high-pressure emulsifier was 10 minutes (Comparative Example 1) and 20 minutes (Comparative Example 2). Similarly, two types of water-dispersed release agent compositions and two types of release sheets were obtained.
As shown in Table 3, the stability of the water-dispersed mold release agent composition was poor, the average particle sizes were 3.50 μm (Comparative Example 1) and 2.10 μm (Comparative Example 2), and the release sheet. The mold release performance was also inferior.
Further, the aqueous dispersion mold release agent composition of Comparative Example 1 was applied to a substrate, and a surface reflection micrograph of the release sheet was taken in an unformed film state during drying (120 ° C., 3 minutes). However, the particle size of the release agent particles was agglomerated in a coarse state of 1 μm or more, and only partially covered the substrate.
[0066]
Comparative Example 3
A release sheet was obtained in the same manner as in Comparative Example 2 except that the average coating thickness after drying and film formation was 2.0 μm.
As shown in Table 3, the release performance was inferior.
[0067]
Comparative Examples 4 and 5
A release sheet was prepared in the same manner as in Example 1 except that the release agent component was changed as shown in Table 3.
As a result, as shown in Table 3, the release performance was inferior.
[0068]
Comparative Examples 6 and 7
As shown in Table 3, a release sheet was produced in the same manner as in Comparative Example 1 except that the drying time was increased.
As a result, as shown in Table 3, although the performance was slightly improved, the release performance was inferior to the examples.
[0069]
Comparative Examples 8 and 9
A release sheet was prepared in the same manner as in Comparative Example 1 except that the average coating thickness was increased and the drying time was as shown in Table 3.
As shown in Table 3, the results showed that the drying and heating required a long time as the coating amount increased, and the performance was improved, but the results were insufficient as compared with the examples.
[0070]
Comparative Example 10
A release sheet was prepared in the same manner as in Comparative Example 4 except that the drying time was increased as shown in Table 3 and the water-dispersed release agent composition of Comparative Example 1 was used.
As a result, as shown in Table 3, although the performance was slightly improved, the release performance was inferior to the examples.
[0071]
Reference Example 1 to Reference Example 3
The release agent component (R-1, 2, 3) was diluted with toluene as an organic solvent instead of water so that the solid content was 3% by weight. Above, with a # 10 Mayer bar coater, 0.3 g / m in solids2It was applied and dried in the same drying furnace as in Example 1 at 120 ° C. for 30 seconds to obtain a release sheet.
An adhesive tape (Sekisui Chemical Co., Ltd., Kraft tape # 504) was attached to this release paper, and various evaluations were made. As a result, as shown in Table 4, a release sheet having good release performance comparable to that of the example was obtained.
From the above, the water-dispersed mold release agent compositions of the examples have the same performance as that of the solvent-based mold release agent, and there are no environmental problems of organic solvents.
[0072]
[Table 1]
Figure 0003869482
[0073]
[Table 2]
Figure 0003869482
[0074]
[Table 3]
Figure 0003869482
[0075]
[Table 4]
Figure 0003869482
[0076]
Water-dispersed release agent composition, method for measuring performance of release sheet
Various evaluation items shown in Table 2, Table 3, and Table 4 were performed by the following methods.
Storage stability:
The water-dispersed release agent composition is diluted with ion-exchanged water so that the solid content becomes 1% by weight, and left in an atmosphere at 23 ° C. for 72 hours, and then visually checked for aggregation, sedimentation, layer separation, etc. The storage stability was evaluated according to the following criteria.
Further, after filtering the water dilution of the water dispersion mold release agent composition through a 200 mesh stainless steel filter and drying the filtration residue, the weight was measured and all of the dilution before standing at 23 ° C. for 72 hours was measured. The weight ratio (% by weight) relative to the solid content was determined.
[Criteria]
○ Neither flocculation, sedimentation nor layer separation is observed, and storage stability is good
△ ... Agglomeration, sedimentation, and layer separation are observed, and storage stability is insufficient.
X ... Agglomeration occurred immediately after emulsification and dispersion, and a water-dispersed release agent composition could not be obtained.
[0077]
Average particle size:
Using a laser diffraction / scattering particle size distribution analyzer (trade name “9220FRA”, manufactured by MICROTRAC), the aqueous dispersion release agent composition was diluted to a predetermined concentration and measured.
[0078]
Deployability:
In accordance with JIS Z-0237 “Testing Method for Adhesive Tapes / Adhesive Sheets”, an adhesive tape (trade name “Craft Tape # 504”, Sekisui Chemical Co., Ltd.) cut into a 25 mm wide strip on the release surface of the release sheet Made with a pressure roller, and left for 24 hours in an atmosphere of 23 ° C. and 65% RH, and in that atmosphere, using a high-speed peel tester, with a peel rate of 10 m / min. Then, a “180 degree peeling test” was performed, and the development force (g / 25 mm) was obtained. The lower the development force, the better the release property of the release sheet.
[0079]
Residual adhesive strength:
The test piece produced by the same method as in the case of the developing force was left for 24 hours in an atmosphere of 23 ° C. and 65% RH, and then the adhesive tape was peeled from the release sheet. Next, in accordance with JIS Z-0237, the peeled adhesive tape was affixed to a stainless steel plate with a pressure roller and left in an atmosphere of 23 ° C. and 65% RH for 24 hours. The “180 degree peeling test” was performed at a peeling speed of 300 mm / min, and the peel strength P (g / 25 mm) was measured.
Separately, it was 2010 (g / 25 mm) when it was affixed on a stainless steel plate in the same manner using an adhesive tape that was not affixed to the release sheet, and the peel strength was measured under the same conditions. The ratio of both peel strengths [(P / 2010) × 100] was calculated to determine the residual adhesive strength (%). The closer the residual adhesive force is to 100%, the smaller the amount of release agent component transferred to the pressure-sensitive adhesive layer.
[0080]
【The invention's effect】
As described above, since the water-dispersed release agent composition of the present invention is configured as described above, it has excellent storage stability and is excellently released by heating in a short time after being applied to a substrate. Exhibits moldability and can exhibit the property that the release agent component does not migrate to the pressure-sensitive adhesive layer.
Further, since the release sheet of the present invention is configured as described above, it is excellent in the release property of the release agent layer and the non-migration property to the adhesive layer, mainly an adhesive tape, an adhesive sheet, etc. It is preferably used as an adhesive processed product.

Claims (2)

(a)アミノ基を有するポリアミン化合物の活性水素1当量に対し、(b)イソシアネート基、カルボキシル基、酸ハライド基、ケテン基、アルデヒド基、及び、エポキシ基からなる群より選ばれる少なくとも1種の活性水素反応性の官能基を有し、アルキル基の炭素数が6〜30である長鎖アルキル化合物を0.5当量以上の割合で反応させて得られる離型剤成分が、平均粒子径(レーザー回折光散乱法によりレーザー回折散乱式粒度分布計を用いて測定した粒子径分布曲線における下限もしくは上限からの頻度の累積値が50%になったところの粒子径)が0.55μm以下となるように水中に分散されて成ることを特徴とする水分散系離型剤組成物。(A) At least one selected from the group consisting of an isocyanate group, a carboxyl group, an acid halide group, a ketene group, an aldehyde group, and an epoxy group with respect to 1 equivalent of active hydrogen of a polyamine compound having an amino group The release agent component obtained by reacting a long-chain alkyl compound having an active hydrogen-reactive functional group and an alkyl group having 6 to 30 carbon atoms in a proportion of 0.5 equivalent or more has an average particle size ( The particle diameter when the cumulative value of the frequency from the lower limit or the upper limit in the particle size distribution curve measured by a laser diffraction light scattering method using a laser diffraction / scattering particle size distribution meter becomes 50% is 0.55 μm or less. A water-dispersed mold release agent composition characterized by being dispersed in water. 基材の少なくとも片面に、請求項1に記載の水分散系離型剤組成物から成る離型剤層が設けられていることを特徴とする離型シート。 A release sheet comprising a release agent layer comprising the water-dispersed release agent composition according to claim 1 provided on at least one side of a substrate.
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JP4562821B2 (en) * 1998-10-21 2010-10-13 大日本印刷株式会社 Adhesive label that can be partially peeled off
TW581780B (en) 1998-10-22 2004-04-01 Nippon Catalytic Chem Ind Aqueous polymer dispersion, production process therefor, and aqueous release agent
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