JP6275228B2 - 粘着剤組成物、粘着剤層および粘着シート - Google Patents
粘着剤組成物、粘着剤層および粘着シート Download PDFInfo
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- JP6275228B2 JP6275228B2 JP2016220557A JP2016220557A JP6275228B2 JP 6275228 B2 JP6275228 B2 JP 6275228B2 JP 2016220557 A JP2016220557 A JP 2016220557A JP 2016220557 A JP2016220557 A JP 2016220557A JP 6275228 B2 JP6275228 B2 JP 6275228B2
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- 125000001421 myristyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- KRSOEVAVUOYJDA-UHFFFAOYSA-N n-(1-hydroxypropyl)-2-methylprop-2-enamide Chemical compound CCC(O)NC(=O)C(C)=C KRSOEVAVUOYJDA-UHFFFAOYSA-N 0.000 description 1
- AADPGYDUTSGSMI-UHFFFAOYSA-N n-(1-hydroxypropyl)prop-2-enamide Chemical compound CCC(O)NC(=O)C=C AADPGYDUTSGSMI-UHFFFAOYSA-N 0.000 description 1
- ALOMUOPELMEPHJ-UHFFFAOYSA-N n-(2-hydroxybutyl)-2-methylprop-2-enamide Chemical compound CCC(O)CNC(=O)C(C)=C ALOMUOPELMEPHJ-UHFFFAOYSA-N 0.000 description 1
- KZNPIUNERUJTFX-UHFFFAOYSA-N n-(2-hydroxybutyl)prop-2-enamide Chemical compound CCC(O)CNC(=O)C=C KZNPIUNERUJTFX-UHFFFAOYSA-N 0.000 description 1
- BSCJIBOZTKGXQP-UHFFFAOYSA-N n-(2-hydroxyethyl)-2-methylprop-2-enamide Chemical compound CC(=C)C(=O)NCCO BSCJIBOZTKGXQP-UHFFFAOYSA-N 0.000 description 1
- UUORTJUPDJJXST-UHFFFAOYSA-N n-(2-hydroxyethyl)prop-2-enamide Chemical compound OCCNC(=O)C=C UUORTJUPDJJXST-UHFFFAOYSA-N 0.000 description 1
- OKPYIWASQZGASP-UHFFFAOYSA-N n-(2-hydroxypropyl)-2-methylprop-2-enamide Chemical compound CC(O)CNC(=O)C(C)=C OKPYIWASQZGASP-UHFFFAOYSA-N 0.000 description 1
- IPGRTXQKFZCLJS-UHFFFAOYSA-N n-(2-hydroxypropyl)prop-2-enamide Chemical compound CC(O)CNC(=O)C=C IPGRTXQKFZCLJS-UHFFFAOYSA-N 0.000 description 1
- MSLHRSMWXQOHNA-UHFFFAOYSA-N n-(3-hydroxybutyl)-2-methylprop-2-enamide Chemical compound CC(O)CCNC(=O)C(C)=C MSLHRSMWXQOHNA-UHFFFAOYSA-N 0.000 description 1
- YXMYPOYILIWOID-UHFFFAOYSA-N n-(3-hydroxybutyl)prop-2-enamide Chemical compound CC(O)CCNC(=O)C=C YXMYPOYILIWOID-UHFFFAOYSA-N 0.000 description 1
- ZTUGCJNAJJDKDC-UHFFFAOYSA-N n-(3-hydroxypropyl)-2-methylprop-2-enamide Chemical compound CC(=C)C(=O)NCCCO ZTUGCJNAJJDKDC-UHFFFAOYSA-N 0.000 description 1
- ZEMHQYNMVKDBFJ-UHFFFAOYSA-N n-(3-hydroxypropyl)prop-2-enamide Chemical compound OCCCNC(=O)C=C ZEMHQYNMVKDBFJ-UHFFFAOYSA-N 0.000 description 1
- YBWQZBVPWXXJKQ-UHFFFAOYSA-N n-(4-hydroxybutyl)prop-2-enamide Chemical compound OCCCCNC(=O)C=C YBWQZBVPWXXJKQ-UHFFFAOYSA-N 0.000 description 1
- DNTMQTKDNSEIFO-UHFFFAOYSA-N n-(hydroxymethyl)-2-methylprop-2-enamide Chemical compound CC(=C)C(=O)NCO DNTMQTKDNSEIFO-UHFFFAOYSA-N 0.000 description 1
- 125000006606 n-butoxy group Chemical group 0.000 description 1
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000000740 n-pentyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 description 1
- 125000003506 n-propoxy group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])O* 0.000 description 1
- SLCVBVWXLSEKPL-UHFFFAOYSA-N neopentyl glycol Chemical compound OCC(C)(C)CO SLCVBVWXLSEKPL-UHFFFAOYSA-N 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 125000004433 nitrogen atom Chemical group N* 0.000 description 1
- 125000001196 nonadecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000001400 nonyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- WWZKQHOCKIZLMA-UHFFFAOYSA-N octanoic acid Chemical compound CCCCCCCC(O)=O WWZKQHOCKIZLMA-UHFFFAOYSA-N 0.000 description 1
- 125000002347 octyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000005447 octyloxy group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])O* 0.000 description 1
- 239000012788 optical film Substances 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 239000012766 organic filler Substances 0.000 description 1
- 125000000913 palmityl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000002958 pentadecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 125000004115 pentoxy group Chemical group [*]OC([H])([H])C([H])([H])C([H])([H])C(C([H])([H])[H])([H])[H] 0.000 description 1
- 125000001147 pentyl group Chemical group C(CCCC)* 0.000 description 1
- 125000000951 phenoxy group Chemical group [H]C1=C([H])C([H])=C(O*)C([H])=C1[H] 0.000 description 1
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- PJGSXYOJTGTZAV-UHFFFAOYSA-N pinacolone Chemical compound CC(=O)C(C)(C)C PJGSXYOJTGTZAV-UHFFFAOYSA-N 0.000 description 1
- 238000009832 plasma treatment Methods 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 229920001083 polybutene Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
- 239000011112 polyethylene naphthalate Substances 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 239000005056 polyisocyanate Substances 0.000 description 1
- 229920001228 polyisocyanate Polymers 0.000 description 1
- 239000003505 polymerization initiator Substances 0.000 description 1
- 229920000306 polymethylpentene Polymers 0.000 description 1
- 239000011116 polymethylpentene Substances 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920001451 polypropylene glycol Polymers 0.000 description 1
- 229920006264 polyurethane film Polymers 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 239000005033 polyvinylidene chloride Substances 0.000 description 1
- KCTAWXVAICEBSD-UHFFFAOYSA-N prop-2-enoyloxy prop-2-eneperoxoate Chemical compound C=CC(=O)OOOC(=O)C=C KCTAWXVAICEBSD-UHFFFAOYSA-N 0.000 description 1
- GVIIRWAJDFKJMJ-UHFFFAOYSA-N propan-2-yl 3-oxobutanoate Chemical compound CC(C)OC(=O)CC(C)=O GVIIRWAJDFKJMJ-UHFFFAOYSA-N 0.000 description 1
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 229920005604 random copolymer Polymers 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 125000005920 sec-butoxy group Chemical group 0.000 description 1
- 229920006012 semi-aromatic polyamide Polymers 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 125000004079 stearyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 125000001424 substituent group Chemical group 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 238000010557 suspension polymerization reaction Methods 0.000 description 1
- 125000004213 tert-butoxy group Chemical group [H]C([H])([H])C(O*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- WMOVHXAZOJBABW-UHFFFAOYSA-N tert-butyl acetate Chemical compound CC(=O)OC(C)(C)C WMOVHXAZOJBABW-UHFFFAOYSA-N 0.000 description 1
- UWHCKJMYHZGTIT-UHFFFAOYSA-N tetraethylene glycol Chemical compound OCCOCCOCCOCCO UWHCKJMYHZGTIT-UHFFFAOYSA-N 0.000 description 1
- 230000036962 time dependent Effects 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 125000002889 tridecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
- LENZDBCJOHFCAS-UHFFFAOYSA-N tris Chemical compound OCC(N)(CO)CO LENZDBCJOHFCAS-UHFFFAOYSA-N 0.000 description 1
- 125000002948 undecyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 229920001567 vinyl ester resin Polymers 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 229910052726 zirconium Inorganic materials 0.000 description 1
- 239000004711 α-olefin Substances 0.000 description 1
Landscapes
- Adhesive Tapes (AREA)
- Adhesives Or Adhesive Processes (AREA)
Description
イソシアネート系架橋剤(B)0.1重量部〜10重量部、
鉄を活性中心とする触媒(C)0.002重量部〜0.5重量部、
ケト−エノール互変異性を起こす化合物(D)を含む粘着剤組成物であり、
鉄を活性中心とする触媒(C)に対するケト−エノール互変異性を起こす化合物(D)の重量比(D/C)が3〜70である粘着剤組成物を提供する。
イソシアネート系架橋剤(B)0.1重量部〜10重量部、
鉄を活性中心とする触媒(C)0.002重量部〜0.5重量部、
ケト−エノール互変異性を起こす化合物(D)を含む粘着剤組成物であり、
鉄を活性中心とする触媒(C)に対するケト−エノール互変異性を起こす化合物(D)の重量比(D/C)が3〜70であることを特徴とする。
本発明の粘着剤組成物は、活性水素含有官能基を有するアクリルポリマー(A)を含む。活性水素含有官能基を有するアクリルポリマー(A)は、後述するイソシアネート系架橋剤(B)と反応可能な水酸基やカルボキシル基などの活性水素を含有する官能基を、主鎖または側鎖上に有するアクリルポリマーである。このような活性水素含有官能基を有するアクリルポリマー(A)は、少なくとも(メタ)アクリル酸アルキルエステルを主成分とし、活性水素を含有する官能基モノマー(以下、活性水素含有官能基モノマーと称する場合がある)とを単量体成分とし、その共重合により得ることができる。
N−メチロールアクリルアミド、N−メチロールメタクリルアミド、N−(2−ヒドロキシエチル)アクリルアミド、N−(2−ヒドロキシエチル)メタクリルアミド、N−(2−ヒドロキシプロピル)アクリルアミド、N−(2−ヒドロキシプロピル)メタクリルアミド、N−(1−ヒドロキシプロピル)アクリルアミド、N−(1−ヒドロキシプロピル)メタクリルアミド、N−(3−ヒドロキシプロピル)アクリルアミド、N−(3−ヒドロキシプロピル)メタクリルアミド、N−(2−ヒドロキシブチル)アクリルアミド、N−(2−ヒドロキシブチル)メタクリルアミド、N−(3−ヒドロキシブチル)アクリルアミド、N−(3−ヒドロキシブチル)メタクリルアミド、N−(4−ヒドロキシブチル)アクリルアミド、N−(4−ヒドロキシブチル)メタクリルアミド等のN−ヒドロキシアルキル(メタ)アクリルアミド;などがあげられる。
(メタ)アクリルアミド、N−置換(メタ)アクリルアミド(例えば、N−エチル(メタ)アクリルアミド、N−n−ブチル(メタ)アクリルアミド等のN−アルキル(メタ)アクリルアミド;
N,N−ジメチル(メタ)アクリルアミド、N,N−ジエチル(メタ)アクリルアミド、N,N−ジプロピル(メタ)アクリルアミド、N,N−ジイソプロピル(メタ)アクリルアミド、N,N−ジ(n−ブチル)(メタ)アクリルアミド、N,N−ジ(t−ブチル)(メタ)アクリルアミド等のN,N−ジアルキル(メタ)アクリルアミド)等の非環状(メタ)アクリルアミド;
N−ビニル−2−ピロリドン、N−ビニル−2−ピペリドン、N−ビニル−3−モルホリノン、N−ビニル−2−カプロラクタム、N−ビニル−1,3−オキサジン−2−オン、N−ビニル−3,5−モルホリンジオン等のN−ビニル環状アミド;
アミノエチル(メタ)アクリレート、N,N−ジメチルアミノエチル(メタ)アクリレート、N,N−ジメチルアミノプロピル(メタ)アクリレート等の、アミノ基を有するモノマー;
N−シクロヘキシルマレイミド、N−フェニルマレイミド等の、マレイミド骨格を有するモノマー;
N−メチルイタコンイミド、N−エチルイタコンイミド、N−ブチルイタコンイミド、N−2−エチルヘキシルイタコンイミド、N−ラウリルイタコンイミド、N−シクロヘキシルイタコンイミド等の、イタコンイミド系モノマー;等の窒素原子含有モノマー等があげられる。
メトキシエチル(メタ)アクリレート、メトキシプロピル(メタ)アクリレート、(メタ)アクリル酸メトキシエチレングリコール、(メタ)アクリル酸メトキシポリプロピレングリコール等の、アルコキシ基を有するモノマー;
アクリロニトリル、メタクリロニトリル等の、シアノ基を有するモノマー;
スチレン、α−メチルスチレン等のスチレン系モノマー;
エチレン、プロピレン、イソプレン、ブタジエン、イソブチレン等のα−オレフィン;2−メタクリロイルオキシエチルイソシアネート等の、イソシアネート基を有するモノマー;
酢酸ビニル、プロピオン酸ビニル等のビニルエステル系モノマー;
ビニルエーテル等のビニルエーテル系モノマー;テトラヒドロフルフリル(メタ)アクリレート等の、複素環を有する(メタ)アクリル酸エステル;
フッ素(メタ)アクリレート等の、ハロゲン原子を有するモノマー;
3−メタクリロキシプロピルトリメトキシシラン、ビニルトリメトキシシラン等の、アルコキシシリル基を有するモノマー;
シリコーン(メタ)アクリレート等の、シロキサン結合を有するモノマー;
シクロペンチル(メタ)アクリレート、シクロヘキシル(メタ)アクリレート、ボルニル(メタ)アクリレート、イソボルニル(メタ)アクリレート等の、脂環式炭化水素基を有する(メタ)アクリレート;
フェニル(メタ)アクリレート、ベンジル(メタ)アクリレート、フェノキシエチル(メタ)アクリレート、(メタ)アクリル酸フェノキシジエチレングリコール等の、芳香族炭化水素基を有する(メタ)アクリレート;等があげられる。
本発明の粘着剤組成物は、イソシアネート系架橋剤(B)を含む。イソシアネート系架橋剤(B)としては、たとえば、ブチレンジイソシアネート、ヘキサメチレンジイソシアネートなどの低級脂肪族ポリイソシアネート類、シクロペンチレンジイソシアネート、シクロへキシレンジイソシアネート、イソホロンジイソシアネートなどの脂環族イソシアネート類、2,4−トリレンジイソシアネート、4,4’−ジフェニルメタンジイソシアネート、キシリレンジイソシアネートなどの芳香族イソシアネート類、トリメチロールプロパン/トリレンジイソシアネート3量体付加物(商品名コロネートL、日本ポリウレタン工業社製)、トリメチロールプロパン/へキサメチレンジイソシアネート3量体付加物(商品名コロネートHL、日本ポリウレタン工業社製)、ヘキサメチレンジイソシアネートのイソシアヌレート体(商品名コロネートHX、日本ポリウレタン工業社製)などのイソシアネート付加物などがあげられる。これらの化合物は単独で用いてもよいし、組み合わせて用いてもよい。
アクリルポリマー(A)M重量部(通常100で計算)中の活性水素含有官能基の量a(mol)=[M×(アクリルポリマー(A)中の活性水素含有モノマーの含有割合)×(活性水素含有モノマー1分子中に含まれる活性水素官能基の数)]/(活性水素含有モノマーの分子量)
(1)
イソシアネート系架橋剤(B)N重量部中のイソシアネート基の量b(mol)=[N×(1分子中に含まれるイソシアネート基の数)]/(架橋剤の分子量)
(2)
本発明の粘着剤組成物は、鉄を活性中心とする触媒(C)(以下、鉄触媒(C)と称する場合がある)を含む。鉄触媒(C)としては、鉄キレート化合物を好適に用いることができ、たとえば一般式Fe(X)(Y)(Z)として表わすことができる。鉄キレート化合物は(X)(Y)(Z)の組み合わせにより、Fe(X)3、Fe(X)2(Y)、Fe(X)(Y)2、Fe(X)(Y)(Z)のいずれかで表される。鉄キレート化合物Fe(X)(Y)(Z)において(X)(Y)(Z)はそれぞれFeに対する配位子であって、例えば、X、YまたはZがβ−ジケトンの場合、β−ジケトンとして、アセチルアセトン、ヘキサン−2,4−ジオン、ヘプタン−2,4−ジオン、ヘプタン−3,5−ジオン、5−メチル−ヘキサン−2,4−ジオン、オクタン−2,4−ジオン、6−メチルヘプタン−2,4−ジオン、2,6−ジメチルヘプタンー3,5−ジオン、ノナン−2,4−ジオン、ノナン−4,6−ジオン、2,2,6,6−テトラメチルヘプタン−3,5−ジオン、トリデカン−6,8−ジオン、1−フェニル−ブタン−1,3−ジオン、ヘキサフルオロアセチルアセトン、アスコルビン酸等があげられる。
本発明の粘着剤組成物は、ケト−エノール互変異性を起こす化合物(D)(以下、ケトーエノール互変異性化合物(D)と称する場合がある)を含む。ケト−エノール互変異性化合物(D)とは、ケト(ケトン、アルデヒド)とエノールの間の互変異性(化1参照)を起こす化合物のことであり、前記鉄触媒に対しキレート化剤として作用する化合物である。
アセチルアセトン、ヘキサン−2,4−ジオン、ヘプタン−2,4−ジオン、ヘプタン−3,5−ジオン、5−メチル−ヘキサン−2,4−ジオン、オクタン−2,4−ジオン、6−メチルヘプタン−2,4−ジオン、2,6−ジメチルヘプタンー3,5−ジオン、ノナン−2,4−ジオン、ノナン−4,6−ジオン、2,2,6,6−テトラメチルヘプタン−3,5−ジオン、トリデカン−6,8−ジオン、1−フェニル−ブタン−1,3−ジオン、ヘキサフルオロアセチルアセトン、アスコルビン酸等のβ−ジケトン類;
無水酢酸等の酸無水物;
アセトン、メチルエチルケトン、メチル−n−ブチルケトン、メチルイソブチルケトン、メチル−tert−ブチルケトン、メチルフェニルケトン、シクロヘキサノン等のケトン類;等をあげることが出来る。これらの化合物の中でも、配合液の粘度上昇を抑える効果が高いβ−ジケトン類を用いることが好ましく、その中でもアセチルアセトンがより好ましい。
作製したポリマーの重量平均分子量は、GPC(ゲル・パーミエーション・クロマトグラフィー)により測定した。
カラム:
サンプルカラム;東ソー社製、TSKguardcolumn Super HZ−H(1本)+TSKgel Super HZM−H(2本)
リファレンスカラム;東ソー社製、TSKgel Super H−RC(1本)
流量:0.6ml/min
注入量:10μl
カラム温度:40℃
溶離液:THF
注入試料濃度:0.2重量%
検出器:示差屈折計
なお、重量平均分子量はポリスチレン換算により算出した。
離型剤で表面処理したポリエチレンテレフタレート(PET)フィルム(厚さ38μm)上に粘着剤組成物溶液を塗布し、130℃で30秒間乾燥することにより溶剤を除去して粘着剤層(厚さ25μm)を形成した。その後、粘着剤層を離型剤で表面処理した離型フィルムで覆い、室温(25℃)で1時間放置しゲル分測定用サンプルを得た。
BH型粘度計を使用して、ローターNo.3、回転数20rpm、液温25℃、測定時間1分の条件で粘着剤配合液の粘度を測定した。配合後1時間、24時間、48時間にそれぞれ測定した。
○・・・粘度が、2.0Pa・s以下
△・・・粘度が、2.0Pa・sより大きく5.0Pa・s未満
×・・・粘度が、5.0Pa・s以上
ポリエチレンテレフタレート(PET)フィルム(厚さ38μm)上に、配合直後および配合後、室温(25℃)で3日間放置した後の粘着剤組成物溶液を塗布し、130℃で30秒間乾燥することにより溶剤を除去して粘着剤層(厚さ25μm)を形成した。その後、離型剤で表面処理した離型フィルムで覆い、室温(25℃)で1時間放置し評価用表面保護フィルムを得た。
作製したそれぞれの評価用粘着シートを幅25mm、長さ100mmのサイズにカットし、イソプロピルアルコールを染み込ませたクリーンウェスで10往復擦って洗浄した清浄なSUS430BAに、2kgのローラを転がして一往復する方法で圧着して接着力評価用サンプルとした。この評価サンプルを、23℃×50%RHの測定環境下に30分放置後、高速剥離試験機を用いて引張速度30m/分、剥離角度180°の条件で接着力[N/25mm]を測定した。
攪拌羽根、温度計、窒素ガス導入管、冷却器、滴下ロートを備えた四つ口フラスコに2−エチルヘキシルアクリレート(2EHA)96重量部、2−ヒドロキシエチルアクリレート(HEA)4重量部、重合開始剤としてアゾビスイソブチロニトリル0.2重量部、酢酸エチル356重量部を仕込み、緩やかに攪拌しながら窒素ガスを導入し、フラスコ内の液温を60℃付近に保って約3時間重合反応を行い、(メタ)アクリルポリマー溶液を調製した。得られた(メタ)アクリルポリマーの重量平均分子量は48万、FOXの式より計算したガラス転移温度は−35℃であった。
(実施例1)
上記アクリルポリマー100重量部(固形分)に対し、架橋剤としてトリメチロールプロパン/トリレンジイソシアネート3量体付加物(日本ポリウレタン工業社製、商品名「コロネートL」)4重量部、鉄触媒としてトリス(アセチルアセトナート)鉄(日本化学産業社製、商品名「ナーセム第二鉄」)0.1重量部、アセチルアセトン(AcAc)2.5重量部を添加し、さらにトルエンで固形分濃度が29重量%になるよう希釈後、撹拌して粘着剤組成物を得た。これを用いて前記作製方法に従い、ゲル分測定用サンプルおよび評価用粘着シートを作製した。
表1に記載の処方により、実施例1と同様の手順により、粘着剤組成物を調整し、粘着シートを作成した。
なお表中、架橋剤における「C/HX」は、ヘキサメチレンジイソシアネートのイソシアヌレート体(日本ポリウレタン工業社製、商品名「コロネートHX」)を、触媒における「OL−1」は、ジオクチルスズジラウレート(東京ファインケミカル社製、商品名「エンビライザー OL−1」)を示す。
Claims (7)
- 活性水素含有官能基を有するアクリルポリマー(A)100重量部、
イソシアネート系架橋剤(B)0.1重量部〜10重量部、
鉄を活性中心とする触媒(C)0.002重量部〜0.5重量部、
ケト−エノール互変異性を起こす化合物(D)0.15〜5重量部を含む粘着剤組成物であり、
鉄を活性中心とする触媒(C)に対するケト−エノール互変異性を起こす化合物(D)の重量比(D/C)が25〜70である粘着剤組成物。 - 前記活性水素含有官能基を有するアクリルポリマー(A)が、炭素数4〜12であるアルキル基を有する(メタ)アクリル酸アルキルエステル70重量%〜99.9重量%、および活性水素含有官能基モノマー0.1重量%〜30重量%を単量体成分として含むことを特徴とする、請求項1に記載の粘着剤組成物。
- 前記鉄を活性中心とする触媒(C)が、鉄キレート化合物であることを特徴とする、請求項1または2に記載の粘着剤組成物。
- 前記ケト−エノール互変異性を起こす化合物(D)が、β−ジケトンであることを特徴とする、請求項1〜3のいずれか一項に記載の粘着剤組成物。
- 架橋後のゲル分が80%以上となることを特徴とする、請求項1〜4のいずれか一項に記載の粘着剤組成物。
- 請求項1〜5のいずれか一項に記載の粘着剤組成物を架橋してなる粘着剤層。
- 請求項6に記載の粘着剤層を支持体上に形成してなる粘着シート。
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