JP6715926B2 - 接着剤組成物及び接着シート - Google Patents
接着剤組成物及び接着シート Download PDFInfo
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- JP6715926B2 JP6715926B2 JP2018524080A JP2018524080A JP6715926B2 JP 6715926 B2 JP6715926 B2 JP 6715926B2 JP 2018524080 A JP2018524080 A JP 2018524080A JP 2018524080 A JP2018524080 A JP 2018524080A JP 6715926 B2 JP6715926 B2 JP 6715926B2
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- adhesive
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- acrylic copolymer
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- 239000007870 radical polymerization initiator Substances 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 229920003987 resole Polymers 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- LDHQCZJRKDOVOX-UHFFFAOYSA-N trans-crotonic acid Natural products CC=CC(O)=O LDHQCZJRKDOVOX-UHFFFAOYSA-N 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J201/00—Adhesives based on unspecified macromolecular compounds
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- Adhesive Tapes (AREA)
Description
本発明の接着剤組成物は、アクリル系共重合体(A)、アミン系硬化剤と硬化反応し得る熱硬化性樹脂(B)及びアミン系硬化剤(C)を含有する組成物である。
(ヤング率、伸び及び引張強度)
接着剤組成物を厚さ25μmのシート状に成形し、これを8枚重ね、180℃、2時間で硬化して厚さ200μm、縦方向50mm、横方向10mmのサイズの試験片を得、この試験片について、JIS K 6251に準拠し、引張速度300mm/分、チャック間10mmの条件で伸び及び引張強度を測定し、その伸び及び引張強度の数値からヤング率を算出する。
(糊はみ出し量)
接着剤組成物を厚さ25μmのシート状に成形し、これを4枚重ねて厚さ100μm、縦方向10mm、横方向10mmのサイズの試験片を得、この試験片をガラス板の間に挾み、温度150℃、圧力1.0MPaで60分間加熱加圧して接着し、はみ出した状態の試験片の縦方向の長さ(Xmm)と横方向の長さ(Ymm)の最大値を合計し、これを糊はみ出し量とする。
本発明の接着シートは、以上説明した接着剤組成物により形成された接着シートである。この接着シートは、接着剤組成物からなる単体のシート(ベースレスタイプの接着シート)であっても良いし、基材の片面又は両面に接着剤組成物からなる接着剤層を形成した接着シートであっても良い。
攪拌機、温度計、還流冷却器及び窒素ガス導入管を備えた反応装置に、表1に示す量(質量%)の成分(A1)、成分(A2)及びその他の成分と、酢酸エチル、連鎖移動剤としてn−ドデカンチオール及び過酸化物系ラジカル重合開始剤としてラウリルパーオキサイド0.1部を仕込んだ。反応装置内に窒素ガスを封入し、攪拌しながら窒素ガス気流下で68℃、3時間、その後78℃、3時間で重合反応させた。次いで室温まで冷却し、酢酸エチルを追加した。これにより、固形分濃度30%のアクリル系共重合体(A)を得た。
・装置:LC−2000シリーズ(日本分光株式会社製)
・カラム:昭和電工社製Shodex(登録商標)KF−806M×2本、Shodex(登録商標) KF−802×1本
・溶離液:テトラヒドロフラン(THF)
・流速:1.0mL/分
・カラム温度:40℃
・注入量:100μL
・検出器:屈折率計(RI)
・測定サンプル:アクリル系共重合体をTHFに溶解させ、アクリル系共重合体の濃度が0.5質量%の溶液を作製し、フィルターによるろ過でゴミを除去したもの。
「2−EHA」:2−エチルヘキシルアクリレート
「BA」:n−ブチルアクリレート
「MA」:メチルアクリレート
「EA」:エチルアクリレート
「AA」:アクリル酸
「4−HBA」:4−ヒドロキシブチルアクリレート
「Vac」:酢酸ビニル
「ACMO」:アクリロイルモルホリン
表2及び3に示す通り、アクリル系共重合体(A)として製造例1〜4及びC1〜C2で得たアクリル系共重合体の固形分100部に対して、熱硬化性樹脂(B)としてノボラックフェノール樹脂(荒川化学社製、商品名タマノル(登録商標)759)及びアミン系硬化剤(C)としてヘキサメチレンテトラミン(大内新興化学社製、商品名ノクセラー(登録商標)H)を加えて混合し、接着剤組成物を得た。
実施例1〜3、参考例4及び比較例1〜5で得た接着シートを、以下の方法で評価した。結果を表2及び3に示す。
厚さ25μmの接着シートを4枚重ね、カットして、厚さ100μm、縦方向10mm、横方向10mmのサイズの試験片4を得た。試験片4を、図2(A)に示すようにガラス板5の間に挾み、温度150℃、圧力1.0MPaで60分間加熱加圧して接着した。図2(B)に示す試験片4は、この加熱加圧によって図(C)に示すように元の状態からはみ出した状態になった。はみ出した状態の試験片4の縦方向の長さ(Xmm)と横方向の長さ(Ymm)の最大値を合計し、これを糊はみ出し量とした。
厚さ25μmの接着シートを8枚重ね、180℃、2時間で硬化し、カットして、厚さ200μm、縦方向50mm、横方向10mmのサイズの試験片を得た。そして引張試験機を用いて、JIS K 6251に準拠し、引張速度300mm/分、チャック間10mmの条件で伸び及び引張強度を測定し、その伸び及び引張強度の数値からヤング率を算出した。
厚さ25μmの接着シートと厚さ25μmのポリイミドフィルムを100℃に設定したラミネーターで貼り合わせた。次いで、SUS304板に、圧力1.25MPa、180℃、2時間で硬化接着させて試験片を得た。引張試験機を用いて、JIS Z 0237に準拠して、常温(23℃、50%RH)、引張速度300mm/分の条件で180°剥離試験を行い、引き剥がし粘着力(N/20mm)を測定した。
表2から明らかなように、実施例1〜3、参考例4の接着シートは加熱加圧硬化する際の糊はみ出し量が少なく、耐糊はみ出し性に優れていた。またヤング率、引張強度、伸びの測定結果から理解できるように、硬化後の接着シートは十分な柔軟性を有していた。さらに接着力の測定結果から理解できるように、耐熱性及び接着性も十分であった。
導電性粒子(D)として金属粒子(D1)〜(D3)を表4に示す量(部)加えて混合したこと以外は、実施例1と同様にして接着剤組成物を調製し、ベースレスタイプの接着シートを得た。
「D2」:ニッケル系導電性粒子(NOVAMET社製、商品名HCA−1、フレーク状)
「D3」:銅(コア)−銀(めっき)系導電性粒子(東洋アルミ社製、商品名TFM-C05F、球形、平均粒径6μm)
実施例5〜9で得た接着シートを上述した方法で評価した。さらに、以下の方法で電気抵抗値も測定した。結果を表4に示す。
25mm×25mmに切断した接着シートを真ちゅう製(金めっき)の電極に挟みこみ、電極の上部から3.5Nの圧力をかけた状態で、0.1Aの電流が流れるように電圧を調整し、R(抵抗値)=V(電圧)/I(電流)の式から電気抵抗値(Ω)を算出した。
2 離型紙
3 FPC
4 試験片
5 ガラス板
Claims (12)
- 酸価が30mgKOH/g以上、重量平均分子量が50万以上であり、水酸基含有モノマーに起因する単量体単位を含み、該単量体単位の含有量が0.01〜0.5質量%(アクリル系共重合体(A)を構成する単量体単位100質量%を基準とする)であるアクリル系共重合体(A)、アミン系硬化剤と硬化反応し得る熱硬化性樹脂(B)、及び、アミン系硬化剤(C)を含有する接着剤組成物。
- アクリル系共重合体(A)が、炭素原子数1〜14のアルキル基を有する(メタ)アクリル酸アルキルエステルに起因する単量体単位(A1)を含む請求項1記載の接着剤組成物。
- アクリル系共重合体(A)が、カルボキシル基含有モノマーに起因する単量体単位(A2)を含み、該単量体単位の含有量が5質量%以上である請求項1記載の接着剤組成物。
- 熱硬化性樹脂(B)の含有量が、アクリル系共重合体(A)100質量部に対して20〜60質量部である請求項1記載の接着剤組成物。
- アミン系硬化剤(C)の含有量が、アクリル系共重合体(A)及び熱硬化性樹脂(B)の合計100質量部に対して1質量部未満である請求項1記載の接着剤組成物。
- 導電性粒子(D)をさらに含有する請求項1記載の接着剤組成物。
- 導電性粒子(D)が金属粒子を含む請求項6記載の接着剤組成物。
- 導電性粒子(D)の含有量が、アクリル系共重合体(A)及び熱硬化性樹脂(B)の合計100質量部に対して0.01〜100質量部である請求項6記載の接着剤組成物。
- 以下の方法で測定されるヤング率が50.0MPa以下であり、伸びが100%以上である請求項1記載の接着剤組成物。
(ヤング率及び伸び)
接着剤組成物を厚さ25μmのシート状に成形し、これを8枚重ね、180℃、2時間で硬化して厚さ200μm、縦方向50mm、横方向10mmのサイズの試験片を得、この試験片について、JIS K 6251に準拠し、引張速度300mm/分、チャック間10mmの条件で伸び及び引張強度を測定し、その伸び及び引張強度の数値からヤング率を算出する。 - 以下の方法で測定される糊はみだし量が60mm以下である請求項1記載の接着剤組成物。
(糊はみ出し量)
接着剤組成物を厚さ25μmのシート状に成形し、これを4枚重ねて厚さ100μm、縦方向10mm、横方向10mmのサイズの試験片を得、この試験片をガラス板の間に挾み、温度150℃、圧力1.0MPaで60分間加熱加圧して接着し、はみ出した状態の試験片の縦方向の長さ(Xmm)と横方向の長さ(Ymm)の最大値を合計し、これを糊はみ出し量とする。 - 請求項1記載の接着剤組成物により形成された接着シート。
- 厚さが2〜100μmである請求項11記載の接着シート。
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