JP2009263494A - 低温粗面用水性粘着剤組成物 - Google Patents
低温粗面用水性粘着剤組成物 Download PDFInfo
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- JP2009263494A JP2009263494A JP2008114533A JP2008114533A JP2009263494A JP 2009263494 A JP2009263494 A JP 2009263494A JP 2008114533 A JP2008114533 A JP 2008114533A JP 2008114533 A JP2008114533 A JP 2008114533A JP 2009263494 A JP2009263494 A JP 2009263494A
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- Prior art keywords
- weight
- sensitive adhesive
- acrylic
- pressure
- acrylic copolymer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims abstract description 47
- 239000002245 particle Substances 0.000 claims abstract description 38
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- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 4
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 4
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 description 4
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- 239000004480 active ingredient Substances 0.000 description 3
- 125000003342 alkenyl group Chemical group 0.000 description 3
- 235000011114 ammonium hydroxide Nutrition 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
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- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
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Landscapes
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Abstract
【解決手段】 ガラス転移点が-40℃以下であるアクリル系共重合体(A) 85〜95重量%、ガラス転移点が30℃以上であるアクリル系共重合体(B) 5〜15重量%を含む アクリル系共重合体混合物100重量部当り、(C)
粘着付与樹脂 2〜25重量部含み、共重合体(A)の分散粒子の平均粒子径が0.3μm〜0.7μm、共重合体(B)の分散粒子の平均粒子径が0.5μm以下であって、23°CでのSUS基材への接着力が1200g/25mm以上であり、かつダンボール基材へ-10°Cでの接着力がSUS基材への23°Cでの接着力の90%以上である感圧接着剤組成物により本課題を解決した。
【選択図】 なし
Description
ガラス転移点が-40℃以下であるアクリル系共重合体(A) 85〜95重量%、
ガラス転移点が30℃以上であるアクリル系共重合体(B) 5〜15重量%
を含む アクリル系共重合体混合物100重量部当り、
(C)
粘着付与樹脂 2〜25重量部含む、アクリル系水性感圧接着剤組成物であって、
該アクリル系共重合体(A)の分散粒子の平均粒子径が0.3μm〜0.7μmであり、
且つ、アクリル系共重合体(B)の分散粒子の平均粒子径が0.5μm以下であって、
23°CでのSUS基材への接着力が1200g/25mm以上であり、かつダンボール基材へ-10°Cでの接着力がSUS基材への23°Cでの接着力の90%以上であることを特徴とする。
これらの単量体を単独もしくは2種以上混合して使用することができる。
なお、ここでいう「単独重合体のガラス転移温度(Tg)」は、L. E. ニールセン著、小野木宣治訳「高分子の力学的性質」第11〜35頁に記載されている単量体のガラス転移温度が適用される。
HS-10N」、「アクアロン HS-20N」〔以上、第一工業製薬(株)製〕、「アデカリアソープ SE-10N」〔旭電化工業(株)製〕、「ラテムル S-120」、「ラテムル
S-120A」、「ラテムル S-180」、「ラテムル S-180A」〔以上、花王(株)製〕等のアニオン系反応性乳化剤;例えば、「アクアロン RN-20」、「アクアロン
RN-30」、「アクアロン RN-50」〔以上、第一工業製薬(株)製〕、「アデカリアソープ NE-10」、「アデカリアソープ NE-20」、「アデカリアソープ
NE-30」〔旭電化工業(株)製〕、「RMA-564」、「RMA-568」、「RMA-1114」〔以上、日本乳化剤(株)製〕等のノニオン系反応性乳化剤;などを挙げることができる。
30〜70重量%、好ましくは45〜65重量%、粘度50〜3000cps(BH型回転粘度計、25℃、20rpm;粘度測定条件以下同様)、pH2〜8程度であるのがよい。
これらの単量体を単独もしくは2種以上混合して使用することができる。
5〜15重量% 好ましくは8〜12重量%、〔但し、(A)及び(B)の合計が100重量%である〕を含んでなるものである。
K-2531の環球法に従って測定された値である。
SK-130D」、「ハリエスター SK-508」〔以上ハリマ化成(株)製〕等のロジン樹脂;例えば、「YSポリスター E-1250」、「YSポリスター
T-1300」、〔ヤスハラケミカル(株)製〕等のテルペン・フェノール樹脂;例えば、「QME-125ps」、「QME-800」〔以上東邦化学工業(株)製〕等の石油系炭化水素樹脂;などの商品名で市販されているものが好適に使用される。
K-6768に規定する方法で表面張力γ0=33dyn/cmのもの)に、前(1)項で作成した試験用感圧接着シートより切り出した試験片をJIS Z-0237の方法に従って圧着し、24時間後、23℃、65%RH、剥離速度300mm/分の条件でその剥離強度(g/25mm)を測定する。
[アクリル共重合体(A)の作製]
温度計、撹拌機、窒素導入管および還流冷却器を備えた反応器内にイオン交換水185重量部を仕込み、窒素置換を行った。一方、別の容器にイオン交換水180重量部並びに乳化重合用の界面活性剤として「DKS NL-600」〔ポリオキシエチレンラウリルエーテル型ノニオン系界面活性剤(有効成分濃度100重量%);第一工業製薬(株)製〕7重量部及び「ハイテノールNF-17」〔ポリオキシエチレンジスチリルフェニルエーテル硫酸エステルアンモニウム塩型アニオン系界面活性剤(有効成分濃度95重量%);第一工業製薬(株)製〕7.4重量部を仕込んで撹拌溶解し、次いでこれにブチルアクリレート(BA)459.2重量部、2-エチルヘキシルアクリレート(EHA)189重量部、メチルメタクリレート(MMA)47.6重量部及びアクリル酸(AA)4.2重量部からなる単量体混合物を加えて撹拌し、単量体乳化液を得た。
アクリル系モノマーを表1に示すように換える以外は参考例1と同様にしてアクリル系共重合体の水性分散液(A−2)を得た。この水性分散液の特性値を表1に示した。
アクリル系モノマーを表1に示すように換える以外は参考例1と同様にしてアクリル系共重合体の水性分散液を調整したが、モノマーの共重合性が悪くて水性分散液が得られなかった。
[アクリル共重合体(B)の作製]
温度計、撹拌機、窒素導入管および還流冷却器を備えた反応器内にイオン交換水180重量部を仕込み、窒素置換を行った。一方、別の容器にイオン交換水110重量部並びに乳化重合用の界面活性剤として「ラテムルE-118B」〔ポリオキシエチレンアルキルエーテル型アニオン系界面活性剤(有効成分濃度26重量%);花王株式会社製〕7重量部を仕込んで撹拌溶解し、次いでこれにブチルアクリレート(BA)108重量部、メチルメタクリレート(MMA)480重量部及びアクリル酸(AA)4.2重量部からなる単量体混合物を加えて撹拌し、単量体乳化液を得た。
アクリル系モノマーを表1に示すように換える以外は参考例1と同様にしてアクリル系共重合体の水性分散液(B-2〜B−4)を得た。これらの水性分散液の特性値を表2に示した。
実施例1のアクリル系共重合体の水性分散液(A-1)285重量部、アクリル系共重合体水性分散液(B-1)15重量部に粘着付与樹脂の水性分散液「スーパーエステルE-788」 〔重合ロジンエステル樹脂、固形分濃度50重量部%、軟化点160℃、重量平均分子量3000、平均粒子径0.4μm;荒川化学工業(株)製〕8重量部、固形分濃度40重量%のジオクルスルホコハク酸ナトリウム型アニオン系界面活性剤2.6重量部を添加し、次いでアクリル系アルカリ増粘剤及びアンモニア水を添加してpH7.5、粘度4500mPa・s(25℃、BM型回転粘度計60rpm)のアクリル系水性感圧接着剤組成物を得た。
実施例1において、アクリル系共重合体の水性分散液(A-1)、アクリル系共重合体の水性分散液(B-1)及び粘着付与樹脂の水性分散液(E-788)の使用割合を変え、又は、アクリル系共重合体の水性分散液(A-1)のみを用いて粘着付与樹脂の水性分散液を使用しない以外は実施例1と同様にしてアクリル系水性感圧接着剤組成物を得、以下同様にして感圧接着シートを作成して該感圧接着シートの物性測定を行った。感圧接着剤組成物の配合組成、使用した粘着付与樹脂の種類とその特性値、得られる組成物の特性値を表3に、感圧接着シートの諸物性を表4に示す。
実施例1において、参考例1のアクリル系共重合体の水性分散液(A-1)を用いる代わりに、アクリル系共重合体の水性分散液(A-2)、 (B−2)〜(B−3)をそれぞれ用いる以外は実施例1と同様にしてアクリル系水性感圧接着剤組成物を得、以下同様にして感圧接着シートを作成して該感圧接着シートの物性測定を行った。感圧接着剤の配合組成、使用した粘着付与樹脂の種類とその特性値、得られる組成物の特性値を表3に、感圧接着シートの諸物性を表4に示す。
実施例1において、粘着付与樹脂を用いない 以外は実施例1と同様にしてアクリル系水性感圧接着剤組成物を得、以下同様にして感圧接着シートを作成して該感圧接着シートの物性測定を行った。感圧接着剤の配合組成、使用した粘着付与樹脂の種類とその特性値、得られる組成物の特性値を表3に、感圧接着シートの諸物性を表4に示す。
Claims (4)
- ガラス転移点が-40℃以下であるであるアクリル系共重合体(A)
85〜95重量%、ガラス転移点が30℃以上であるアクリル系共重合体(B) 5〜15重量%
を含むアクリル系共重合体混合物 100重量部当り、
粘着付与樹脂(C) を 2〜25 重量部含む アクリル系水性感圧接着剤組成物であって、
該アクリル系共重合体(A)の分散粒子の平均粒子径が0.3μm〜0.7μmであり、
且つ、アクリル系共重合体(B)の分散粒子の平均粒子径が0.3μm以下であって、
23°CでのSUS基材への接着力が1200g/25mm以上であり、
かつ ダンボール基材への-10°Cでの接着力が23°CでのSUS基材への接着力の90%以上であることを特徴とするアクリル系水性感圧接着剤組成物。 - アクリル系共重合体(A)が下記単量体(a-1)〜(a-3)、(a-1)
下記一般式で表され、その単独重合体のガラス転移点が−20℃以下であるアクリル酸エステル 50〜99.9重量%、CH2=CH−COOR1(式中、R1は炭素数2〜12の直鎖もしくは分枝アルキル基を示す)
(a-2) 炭素数3〜5のα,β-不飽和モノ-又はジ-カルボン酸0.3〜2重量%、
(a-3) 上記単量体(a-1)〜(a-2)と共重合可能な、該単量体(a-1),(a-2)以外の共単量体
0〜45重量%、を乳化共重合してなるアクリル系共重合体である請求項1記載のアクリル系水性感圧接着剤組成物。 - 粘着付与樹脂の軟化点が70〜180℃であり、重量平均分子量が5000以下である請求項1又は2に記載のアクリル系水性感圧接着剤組成物。
- 粘着付与樹脂が、ロジン樹脂である請求項1〜3の何れか1項に記載のアクリル系水性感圧接着剤組成物。
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