JP2021024999A - 粘着剤組成物及び粘着フィルム - Google Patents
粘着剤組成物及び粘着フィルム Download PDFInfo
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- JP2021024999A JP2021024999A JP2019146317A JP2019146317A JP2021024999A JP 2021024999 A JP2021024999 A JP 2021024999A JP 2019146317 A JP2019146317 A JP 2019146317A JP 2019146317 A JP2019146317 A JP 2019146317A JP 2021024999 A JP2021024999 A JP 2021024999A
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- 230000001070 adhesive effect Effects 0.000 title abstract description 20
- 239000002313 adhesive film Substances 0.000 title description 8
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- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 claims abstract description 63
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- 239000010410 layer Substances 0.000 claims description 4
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- 239000012634 fragment Substances 0.000 description 2
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- 125000003055 glycidyl group Chemical group C(C1CO1)* 0.000 description 2
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- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
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- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/12—Esters of monohydric alcohols or phenols
- C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
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Abstract
Description
前記アクリル重合体(A)が、(メタ)アクリレートモノマー(a1)に由来する単位と;窒素含有モノマー(a2)に由来する単位と;酸基を有するモノマー(a3)及び水酸基を有するモノマー(a4)からなる群より選ばれる少なくとも1種に由来する単位を含み、
前記(メタ)アクリレートモノマー(a1)が、ホモポリマーのガラス転移温度(Tg)が−15℃未満である低Tgモノマー(a1−1)と、ホモポリマーのガラス転移温度(Tg)が−15℃以上である高Tgモノマー(a1−2)とを含むものであり、
前記低Tgモノマー(a1−1)が、ブチルアクリレートを含むものであり、
前記酸基を有するモノマー(a3)及び水酸基を有するモノマー(a4)に由来する単位の合計が、前記アクリル重合体(A)中、2質量%以上であることを特徴とする。
<アクリル樹脂(A)の合成>
攪拌機、還流冷却管、窒素導入管、温度計を備えた反応容器に、n−ブチルアクリレート200質量部、2−エチルヘキシルアクリレート277質量部、シクロヘキシルアクリレート400質量部、ダイアセトンアクリルアミド50質量部、アクリル酸70質量部、4−ヒドロキシブチルアクリレート3質量部、酢酸エチル1000質量部を仕込み、攪拌下、窒素を吹き込みながら70℃まで昇温した。1時間後に、予め酢酸エチルにて溶解した2,2’−アゾビス(2−メチルブチロニトリル)溶液10質量部(固形分5質量%)を添加した。その後、攪拌下70℃にて8時間ホールドした後、内容物を冷却し200メッシュ金網にて濾過し、不揮発分50質量%、粘度100、000mPa・s、重量平均分子量90万のアクリル樹脂(A1)を得た。
(メタ)アクリレートモノマー(a1)、窒素含有モノマー(a2)、酸基を有するモノマー(a3)、水酸基を有するモノマー(a4)を表1、2に示す通りに変更したこと以外は、合成例1と同様にして、アクリル樹脂(A2)〜(A7)、比較アクリル樹脂(A1’)〜(A5’)を得た。
合成例1で得られたアクリル樹脂(A1)100質量部に対して、エポキシ系架橋剤(ファインタック硬化剤EX−50;DIC(株)製)0.3質量部を均一になるように攪拌混合することによってアクリル粘着組成物を得た。
合成例1で得られたアクリル樹脂(A1)を100質量部用いる代わりに、合成例2〜7、比較合成例1〜5で得られたアクリル樹脂(A2)〜(A7)、比較アクリル樹脂(A1’)〜(A5’)をそれぞれ100質量部用いること以外は、実施例1と同様にして、アクリル粘着組成物を得た。
表面に離型処理された厚さ50μmのポリエチレンテレフタレートフィルム(離型PET50)の表面に、溶剤乾燥後における膜厚が25μmとなるように後記実施例で得られたアクリル系粘着剤組成物を塗布し、80℃乾燥機中で3分間溶剤を揮発した後、PET50μmフィルムを貼り合せた。
前述の方法で作成した粘着フィルムを25mm幅に切ったものを試験片とした。被着体をガラス板とし、2kgロール×2往復で被着体に貼り付けた。貼り付け1時間後に23℃、50%RHの雰囲気下で180度剥離強度を測定し、接着力とした。
前述の方法で作成した粘着フィルムを25mm幅に切ったものを試験片とした。鏡面仕上げしたステンレス板に対し、接着面積が25mm×25mmとなるように2kgロール×2往復にて貼り付けた。このステンレス板に貼り付けた試験片に対し、70℃雰囲気下にて1kgの荷重を、ステンレス板に対して0°の方向(剪断方向)にかけ、粘着フィルムが被着体からずれ落ちるまでの時間を測定し、その保持時間を保持力とした。また、24時間後にも保持されていた場合には、保持時間を24時間以上とし、初期貼り付け位置からのずれ幅を測定し併記した。
前述の方法で作成した粘着フィルムをガラス板に貼り付けたものを試験片とした。その試験片を、光源C、視野2°、「分光測色計」CM−5000d(コニカミノルタセンシング(株)製)にて、JIS K 7105に準じて黄変度(b*)を測定した。
前述の方法で作成した粘着フィルムをガラス板に貼り付けたものを試験片とした。その試験片を、濁度計「NDH5000」(日本電色工業(株)製)にて、JIS K 7361−1に準じてヘイズ、光線透過率を測定した。
前述の方法で作成した粘着フィルムをガラス板に貼り付け、85℃×85%RH雰囲気下に250時間、及び500時間放置した。その後、もう一枚の離型PET50を剥離し、前述の方法と同様に、JIS K 7105に準じて黄変度(b*)測定した。
BA :n−ブチルアクリレート
2EHA :2−エチルヘキシルアクリレート
CHA :シクロヘキシルアクリレート
MA :メチルアクリレート
n−BMA:n−ブチルメタクリレート
IBXA :イソボロニルアクリレート
DMAA :ジメチルアクリルアミド
DAAM :ダイアセトンアクリルアミド
NIPAM:N−イソプロピルアクリルアミド
ACMO :アクリロイルモルフォリン
AA :アクリル酸
HEA :2−ヒドロキシエチルアクリレート
4HBA :4−ヒドロキシブチルアクリレート
D−40 :ファインタック硬化剤 D−40(イソシアネート系架橋剤:DIC(株)製)
EX−50:ファインタック硬化剤 EX−50(エポキシ系架橋剤:DIC(株)製)
Claims (7)
- アクリル重合体(A)及び架橋剤(B)を含み、
前記アクリル重合体(A)が、(メタ)アクリレートモノマー(a1)に由来する単位と;窒素含有モノマー(a2)に由来する単位と;酸基を有するモノマー(a3)及び水酸基を有するモノマー(a4)からなる群より選ばれる少なくとも1種に由来する単位とを含み、
前記(メタ)アクリレートモノマー(a1)が、ホモポリマーのガラス転移温度(Tg)が−15℃未満である低Tgモノマー(a1−1)と、ホモポリマーのガラス転移温度(Tg)が−15℃以上である高Tgモノマー(a1−2)とを含むものであり、
前記低Tgモノマー(a1−1)が、ブチルアクリレートを含むものであり、
前記酸基を有するモノマー(a3)及び水酸基を有するモノマー(a4)に由来する単位の合計が、前記アクリル重合体(A)中、2質量%以上である粘着剤組成物。 - 前記酸基を有するモノマー(a3)に由来する単位が、前記アクリル重合体(A)中、2.5質量%以上20質量%以下である請求項1記載の粘着剤組成物。
- 前記高Tgモノマー(a1−2)に由来する単位が、前記アクリル重合体(A)中、10質量%以上50質量%以下である請求項1又は2記載の粘着剤組成物。
- 前記窒素含有モノマー(a2)が、(メタ)アクリルアミドモノマーである請求項1〜3のいずれか1項記載の粘着剤組成物。
- さらに溶剤(D)を含むものである請求項1〜4のいずれか1項記載の粘着剤組成物。
- 請求項1〜5のいずれか1項記載の粘着剤組成物から形成される粘着層。
- 請求項6記載の粘着層を有する保護フィルム。
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JP2014136753A (ja) * | 2013-01-17 | 2014-07-28 | Fujimori Kogyo Co Ltd | 粘着剤層、及び粘着フィルム |
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JP2017203100A (ja) * | 2016-05-11 | 2017-11-16 | 昭和電工株式会社 | 粘着シート用硬化性組成物、及びそれを用いた粘着シート |
JP2018016734A (ja) * | 2016-07-28 | 2018-02-01 | サイデン化学株式会社 | 光学フィルム粘着シート |
WO2019087816A1 (ja) * | 2017-11-06 | 2019-05-09 | 綜研化学株式会社 | 粘着剤組成物、粘着剤、及び粘着シート |
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