JP3873651B2 - Antistatic composition - Google Patents
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- JP3873651B2 JP3873651B2 JP2001124186A JP2001124186A JP3873651B2 JP 3873651 B2 JP3873651 B2 JP 3873651B2 JP 2001124186 A JP2001124186 A JP 2001124186A JP 2001124186 A JP2001124186 A JP 2001124186A JP 3873651 B2 JP3873651 B2 JP 3873651B2
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Description
【０００１】
【発明の属する技術分野】
本発明は、帯電防止剤組成物に関する。特に、異方性導電フィルム用のリールの帯電防止用に適した帯電防止剤組成物に関する。
【０００２】
【従来の技術】
一般に、異方性導電フィルムは、２ｍｍ程度の非常に狭い幅にスリットされている。このため、従来より、異方性導電フィルムの荷崩れを防止し、取り扱い性を高めるために、異方性導電フィルムを、ポリスチレン、ポリカーボネートなどの樹脂材料からなるリールに巻き付け、使用時にリールから巻き出して使用している。
【０００３】
ところが、樹脂性のリールを使用した場合、異方性導電フィルムの巻き取りや巻き出しの際にリールが帯電するという問題が生ずる。帯電したリールには静電的に塵芥が引き寄せられ付着し、その結果、塵芥が異方性導電フィルムに巻き込まれたり、異方性導電フィルムに付着したまま異方性導電接続処理が行われ、接続信頼性の低下が生じるという問題がある。
【０００４】
このような問題を解決するためには、カーボンブラック等の導電粉末を練り込んだリールを使用することが確実であるが、リールが透明ではなくなるため、リールの側面から異方性導電フィルムの残量や巻き状態の確認ができないという問題がある。
【０００５】
そこで、陽イオン系界面活性剤や両イオン系界面活性剤を主成分とする水性帯電防止剤組成物をリールにスプレーすることが行われている。
【０００６】
【発明が解決しようとする課題】
しかしながら、水性帯電防止剤組成物をリールにスプレーした場合、リールの透明性は維持されるが、均一な連続被膜が形成し難いために、リールの表面の一部に塵芥が依然として引き寄せられるという問題がある。更に、スプレーにより形成された水性帯電防止剤組成物の被膜は、それ自身が水溶性であるために、水に接触した場合や高湿度環境下に置かれた場合には、リールの表面から異方性導電フィルムへ移行する可能性が高まり、異方性導電フィルムの接続信頼性が損なわれるおそれもある。
【０００７】
以上のような問題は、異方性導電フィルムだけでなく、帯電を嫌う種々の高分子物品（粘着テープ加工品等）にも伴う問題である。
【０００８】
本発明は、従来の技術の問題点を解決しようとするものであり、異方性導電フィルム用のリール等の高分子物品の表面全体に亘って、均一で連続的な帯電防止機能を付与し、且つ帯電防止剤が他の物体へ移行しないようにすることを目的とする。
【０００９】
【課題を解決するための手段】
本発明者は、水溶性帯電防止剤に水混和性アルコールを混合すると、得られた帯電防止剤組成物を帯電防止すべき高分子物品に塗布し乾燥した際に、ハジキ現象を生じることなく塗布面を均一且つ連続的に被覆できること、また、そのような帯電防止剤組成物に特定の樹脂エマルジョンを成膜成分として配合すると、成膜の際に水溶性帯電防止剤と樹脂エマルジョンとの相溶状態を維持でき、乾燥後に耐湿性に優れた膜を形成することを見出し、本発明を完成させるに至った。
【００１０】
即ち、本発明は、水溶性帯電防止剤を０．５〜５重量％と、Ｎ−メチロールアクリルアミド単位を含むアクリル酸エステル共重合体エマルジョンを水溶性帯電防止剤１重量部に対し０．２〜５重量部（樹脂分換算）と、水混和性アルコールを２０〜４０重量％と、水とを含有することを特徴とする帯電防止剤組成物を提供する。
【００１１】
また、本発明は、この帯電防止剤組成物の乾燥塗布膜が表面に形成された高分子物品、特に異方性導電フィルム用リールを提供する。
【００１２】
【発明の実施の形態】
以下、本発明を詳細に説明する。
【００１３】
本発明の帯電防止剤組成物は、水溶性帯電防止剤と、Ｎ−メチロールアクリルアミド単位を含むアクリル酸エステル共重合体エマルジョンと、水混和性アルコールと、水とを含有する。
【００１４】
本発明において使用できる水溶性帯電防止剤としては、イオン伝導性を有するもので、例えば水溶性ポリエステルとポリエチレンオキシドと過塩素酸リチウムとを含有するタイプのものが挙げられる。具体的には、ソルベックス社のイオンソルバーシリーズの水溶性帯電防止剤等を挙げることができるが、中でもイオンソルバー９ａ（ソルベックス社製）を好ましく使用することができる。
【００１５】
水溶性帯電防止剤組成物における水溶性帯電防止剤の含有量は、少なすぎると帯電防止効果が不十分であり、多すぎると成膜成分も多量に使用する必要が生じ、帯電防止層に厚みムラが発生し、外観不良となるので、好ましくは０．５〜５重量％である。
【００１６】
本発明において使用するＮ−メチロールアクリルアミド単位を含むアクリル酸エステル共重合体エマルジョンは成膜成分である。このエマルジョンにおける樹脂分は、エマルジョンの製造方法にもよるが、通常４０〜６０重量％、好ましくは４１〜５１重量％である。
【００１７】
このアクリル酸エステル共重合体を構成するモノマーとしては、Ｎ−メチロールアクリルアミド、アクリル酸エチル、メタクリル酸メチル等が挙げられる。ここで、Ｎ−メチロールアクリルアミドは、成膜後に約１００℃以上に加熱されると、自己縮合反応し、帯電防止膜の膜強度を向上させることができる。
【００１８】
これらのモノマー比に関し、全モノマー１００重量部中にＮ−メチロールアクリルアミドを好ましくは０．１〜１重量部となる量で使用する以外、特に制限はない。これは、Ｎ−メチロールアクリルアミドが少なすぎると硬化不足で過度に柔らかくなり、多すぎると混合液が不安定となるからである。
【００１９】
Ｎ−メチロールアクリルアミド単位を含むアクリル酸エステル共重合体エマルジョンの帯電防止剤組成物中の含有量は、少なすぎると耐水性が不足し、多すぎると帯電防止効果が不足するので、その樹脂分が水溶性帯電防止剤１重量部に対し好ましくは０．２〜５重量部、より好ましくは０．５〜１．５重量部となる割合で含有する。
【００２０】
本発明で使用するＮ−メチロールアクリルアミド単位を含むアクリル酸エステル共重合体エマルジョンは、公知のラジカルエマルジョン重合法により調製することができる。
【００２１】
本発明において使用する水混和性アルコールとしては、メタノール、エタノール、イソプロピルアルコール等の水混和性の低級アルコール、中でもエタノールを使用することが好ましい。
【００２２】
このような水混和性アルコールの帯電防止剤組成物中の含有量は、少なすぎると、組成物を異方性導電フィルム用リール等の被塗布面に塗布した際に、組成物のハジキ現象を有効に防止することができず、多すぎると樹脂分が分離するので、好ましくは１０〜６０重量％、より好ましくは２０〜４０重量％である。
【００２３】
なお、本発明の帯電防止剤組成物は、アクリル酸エステル共重合体エマルジョンに由来する水に加えて、粘度調整等を目的として水、好ましくはイオン交換水を必要に応じて別途含有されることができる。
【００２４】
本発明の帯電防止剤組成物には、以上の成分の他に必要に応じて種々の添加剤（例えば、消泡剤）を含有させることができる。
【００２５】
本発明の帯電防止剤組成物は、以上の成分を常法により均一に混合することにより製造することができる。
【００２６】
本発明の帯電防止剤組成物は、浸漬法やスプレー法など公知の手法に従って使用することができる。例えば、浸漬法は、帯電防止剤組成物の液中に帯電防止すべき対象である高分子物品を浸漬し、それを液から取り出し、１００〜１２０℃の乾燥炉中で乾燥することにより、高分子物品の表面に帯電防止層を形成する方法である。ここで、そのような高分子物品としては、種々の熱可塑性樹脂、熱硬化型、紫外線硬化型もしくは電子線硬化型樹脂からなる成型品が挙げられるが、中でもポリスチレンやポリカーボネート製の異方性導電フィルム用リールを好ましく挙げることができる。
【００２７】
【実施例】
実施例１〜３及び比較例１〜５
２リットルビーカーに、表１に示す配合量で、水溶性帯電防止剤（イオンソルバー９ａ、ソルベックス社製）、Ｎ−メチロールアクリルアミド単位を有するアクリル酸エステル共重合体エマルジョン（樹脂分４５重量％；モビニール７１０、クラリアント社製）、イオン交換水及びエタノールに投入し、撹拌機で均一に混合して液状の帯電防止剤組成物を調製した。
【００２８】
得られた液条の帯電防止剤組成物に、ポリカーボネート製の異方性導電フィルム用リールを一分間浸漬した後に取り出し、１００℃で３分間乾燥し、リールの表面に帯電防止層を形成した。
【００２９】
なお、比較例５の場合には、得られた液状の帯電防止剤組成物をポリカーボネート製の異方性導電フィルム用リールに１０ｇ／ｍ２となる量でスプレーし、１００℃で３分間乾燥し、リールの表面に帯電防止層を形成した。
【００３０】
【表１】
（評価）
帯電防止層が形成されたリールについて、帯電防止効果として表面抵抗値を表面抵抗測定器（高抵抗計、ヒューレットパッカード社製）で測定した。得られた結果を表２に示す。表面抵抗値が１×１０１１Ω以下、好ましくは１×１０９Ω以下である場合に帯電防止効果が良好であると判断できる。
【００３２】
また、帯電防止層の外観について目視観察した。帯電防止層が均一で連続膜を形成した場合をＯＫと評価し、ハジキ現象や膜厚ムラが観察された場合をＮＧと評価した。得られた結果を表２に示す。
【００３３】
更に、形成された帯電防止層に水をスプレーし、帯電防止層の耐水性を目視評価した。変化がない場合をＯＫと評価し、帯電防止層が水に溶け出した場合をＮＧと評価した。得られた結果を表２に示す。
【００３４】
【表２】
表２から、実施例１〜３の帯電防止剤組成物は、帯電防止効果に優れ、外観も耐水性にも優れていることがわかる。
【００３６】
一方、エタノールを使用しない比較例１の帯電防止剤組成物の場合には、リールの表面にハジキ現象が生じた。帯電防止剤を過剰に用いた比較例２の帯電防止剤組成物の場合には、膜厚ムラが生じ、帯電防止剤を過度に少ない量で用いた比較例３の帯電防止剤組成物の場合には、帯電防止効果が不十分であった。また、アクリル酸エステル共重合体エマルジョンを使用しない比較例４の帯電防止剤組成物の場合には、耐水性に問題があった。また、エタノールを使用しない比較例５の帯電防止剤組成物の場合には、組成物をスプレーでリール表面に適用してもリールの表面にスプレーパターンが残ってしまった。
【００３７】
【発明の効果】
本発明の帯電防止剤組成物によれば、異方性導電フィルム用のリール等の高分子物品の表面全体に亘って、均一で連続的な帯電防止機能を付与し、且つ帯電防止剤が他の物体へ移行しないようにできる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an antistatic agent composition. In particular, the present invention relates to an antistatic agent composition suitable for antistatic of a reel for an anisotropic conductive film.
[0002]
[Prior art]
Generally, the anisotropic conductive film is slit to a very narrow width of about 2 mm. For this reason, conventionally, in order to prevent the collapse of the anisotropic conductive film and improve the handleability, the anisotropic conductive film is wound around a reel made of a resin material such as polystyrene or polycarbonate, and wound from the reel at the time of use. I use it out.
[0003]
However, when a resinous reel is used, there arises a problem that the reel is charged when the anisotropic conductive film is wound or unwound. Dust is attracted and attached electrostatically to the charged reel, and as a result, the dust is caught in the anisotropic conductive film, or anisotropic conductive connection processing is performed while adhering to the anisotropic conductive film, There is a problem that connection reliability is lowered.
[0004]
In order to solve such problems, it is certain to use a reel in which conductive powder such as carbon black is kneaded. However, since the reel is not transparent, the anisotropic conductive film remains from the side of the reel. There is a problem that the amount and winding state cannot be confirmed.
[0005]
Therefore, spraying a reel with an aqueous antistatic agent composition mainly composed of a cationic surfactant or a zwitterionic surfactant is performed.
[0006]
[Problems to be solved by the invention]
However, when the reel is sprayed with an aqueous antistatic agent composition, the transparency of the reel is maintained, but it is difficult to form a uniform continuous film, so that dust is still attracted to a part of the surface of the reel. There is. Furthermore, since the coating film of the aqueous antistatic composition formed by spraying is itself water-soluble, it is different from the surface of the reel when in contact with water or in a high humidity environment. The possibility of shifting to the isotropic conductive film is increased, and the connection reliability of the anisotropic conductive film may be impaired.
[0007]
The above problems are problems associated with not only anisotropic conductive films but also various polymer articles (such as processed adhesive tape products) that dislike charging.
[0008]
The present invention is intended to solve the problems of the prior art, and provides a uniform and continuous antistatic function over the entire surface of a polymer article such as a reel for anisotropic conductive film. And it aims at preventing that an antistatic agent transfers to another object.
[0009]
[Means for Solving the Problems]
When the present inventors mix a water-miscible alcohol with a water-soluble antistatic agent, the resulting antistatic agent composition is applied to a polymer article to be antistatically coated and dried without causing repellency. It is possible to coat the surface uniformly and continuously, and when a specific resin emulsion is blended as a film forming component in such an antistatic agent composition, the water-soluble antistatic agent and the resin emulsion are compatible during film formation. The present inventors have found that a film that can maintain the state and has excellent moisture resistance after drying is formed, and the present invention has been completed.
[0010]
That is, the present invention provides a water-soluble antistatic agent in an amount of 0.5 to 5% by weight and an acrylate copolymer emulsion containing an N-methylolacrylamide unit in an amount of 0.2 to 1 part by weight of the water-soluble antistatic agent. Provided is an antistatic agent composition containing 5 parts by weight (resin content) , 20 to 40% by weight of a water-miscible alcohol , and water.
[0011]
The present invention also provides a polymer article, particularly an anisotropic conductive film reel, on which a dry coating film of the antistatic agent composition is formed.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail.
[0013]
The antistatic agent composition of the present invention contains a water-soluble antistatic agent, an acrylate copolymer emulsion containing N-methylolacrylamide units, a water-miscible alcohol, and water.
[0014]
The water-soluble antistatic agent that can be used in the present invention has ion conductivity, and includes, for example, a type containing a water-soluble polyester, polyethylene oxide, and lithium perchlorate. Specific examples include water-soluble antistatic agents of the Solvex Corporation's ion solver series, among which ion solver 9a (manufactured by Solvex) can be preferably used.
[0015]
If the content of the water-soluble antistatic agent in the water-soluble antistatic agent composition is too small, the antistatic effect is insufficient. Since unevenness occurs and the appearance becomes poor, it is preferably 0.5 to 5 % by weight.
[0016]
The acrylate copolymer emulsion containing N-methylolacrylamide units used in the present invention is a film forming component. The resin content in this emulsion is usually 40 to 60% by weight, preferably 41 to 51% by weight, although it depends on the method for producing the emulsion.
[0017]
Examples of the monomer constituting the acrylate copolymer include N-methylolacrylamide, ethyl acrylate, and methyl methacrylate. Here, when N-methylolacrylamide is heated to about 100 ° C. or more after film formation, it can undergo a self-condensation reaction and improve the film strength of the antistatic film.
[0018]
With respect to these monomer ratios, there is no particular limitation except that N-methylolacrylamide is preferably used in an amount of 0.1 to 1 part by weight in 100 parts by weight of all monomers. This is because when the amount of N-methylol acrylamide is too small, the mixture becomes excessively soft due to insufficient curing, and when it is too large, the mixed solution becomes unstable.
[0019]
If the content of the acrylate copolymer emulsion containing an N-methylolacrylamide unit in the antistatic agent composition is too small, the water resistance will be insufficient, and if it is too high, the antistatic effect will be insufficient. The content is preferably 0.2 to 5 parts by weight, more preferably 0.5 to 1.5 parts by weight, based on 1 part by weight of the water-soluble antistatic agent.
[0020]
The acrylate copolymer emulsion containing N-methylolacrylamide units used in the present invention can be prepared by a known radical emulsion polymerization method.
[0021]
As the water-miscible alcohol used in the present invention, it is preferable to use water-miscible lower alcohols such as methanol, ethanol and isopropyl alcohol, especially ethanol.
[0022]
If the content of the water-miscible alcohol in the antistatic agent composition is too small, the composition will be repelled when applied to a coated surface such as a reel for anisotropic conductive film. Since it cannot prevent effectively and a resin part will isolate | separate when too much, Preferably it is 10 to 60 weight%, More preferably, it is 20 to 40 weight%.
[0023]
In addition to the water derived from the acrylate copolymer emulsion, the antistatic agent composition of the present invention additionally contains water, preferably ion-exchanged water, for the purpose of viscosity adjustment and the like, if necessary. Can do.
[0024]
In addition to the above components, the antistatic agent composition of the present invention may contain various additives (for example, an antifoaming agent) as necessary.
[0025]
The antistatic agent composition of the present invention can be produced by uniformly mixing the above components by a conventional method.
[0026]
The antistatic agent composition of the present invention can be used in accordance with a known method such as an immersion method or a spray method. For example, the dipping method involves immersing a polymer article to be antistatic in a liquid of an antistatic agent composition, removing it from the liquid, and drying it in a drying furnace at 100 to 120 ° C. This is a method of forming an antistatic layer on the surface of a molecular article. Here, examples of such a polymer article include molded products made of various thermoplastic resins, thermosetting type, ultraviolet curable type, or electron beam curable type resins, among which anisotropic conductive materials made of polystyrene or polycarbonate. A film reel is preferred.
[0027]
【Example】
Examples 1-3 and Comparative Examples 1-5
In a 2 liter beaker, the water-soluble antistatic agent (Ion Solver 9a, manufactured by Solvex) and an acrylate copolymer emulsion having an N-methylolacrylamide unit (resin content: 45% by weight; Movinyl) 710, manufactured by Clariant), ion-exchanged water and ethanol, and uniformly mixed with a stirrer to prepare a liquid antistatic agent composition.
[0028]
A reel for anisotropic conductive film made of polycarbonate was immersed in the obtained liquid antistatic agent composition for 1 minute and then taken out and dried at 100 ° C. for 3 minutes to form an antistatic layer on the surface of the reel.
[0029]
In the case of Comparative Example 5, the obtained liquid antistatic agent composition was sprayed on a reel for anisotropic conductive film made of polycarbonate in an amount of 10 g / m 2 and dried at 100 ° C. for 3 minutes. An antistatic layer was formed on the surface of the reel.
[0030]
[Table 1]
(Evaluation)
For the reel on which the antistatic layer was formed, the surface resistance value was measured with a surface resistance measuring instrument (high resistance meter, manufactured by Hewlett Packard) as an antistatic effect. The obtained results are shown in Table 2. It can be determined that the antistatic effect is good when the surface resistance value is 1 × 10 11 Ω or less, preferably 1 × 10 9 Ω or less.
[0032]
Further, the appearance of the antistatic layer was visually observed. The case where the antistatic layer was uniform and a continuous film was formed was evaluated as OK, and the case where the repellency phenomenon and film thickness unevenness were observed was evaluated as NG. The obtained results are shown in Table 2.
[0033]
Further, water was sprayed on the formed antistatic layer, and the water resistance of the antistatic layer was visually evaluated. The case where there was no change was evaluated as OK, and the case where the antistatic layer was dissolved in water was evaluated as NG. The obtained results are shown in Table 2.
[0034]
[Table 2]
From Table 2, it can be seen that the antistatic agent compositions of Examples 1 to 3 are excellent in antistatic effect and excellent in appearance and water resistance.
[0036]
On the other hand, in the case of the antistatic agent composition of Comparative Example 1 in which ethanol was not used, a repellency phenomenon occurred on the reel surface. In the case of the antistatic agent composition of Comparative Example 2 in which the antistatic agent is excessively used, the film thickness unevenness occurs, and in the case of the antistatic agent composition of Comparative Example 3 in which the antistatic agent is used in an excessively small amount. However, the antistatic effect was insufficient. Further, in the case of the antistatic agent composition of Comparative Example 4 which does not use an acrylate copolymer emulsion, there was a problem in water resistance. Further, in the case of the antistatic agent composition of Comparative Example 5 in which ethanol was not used, a spray pattern remained on the reel surface even when the composition was applied to the reel surface by spraying.
[0037]
【The invention's effect】
According to the antistatic agent composition of the present invention, a uniform and continuous antistatic function is imparted over the entire surface of a polymer article such as a reel for anisotropic conductive film. It is possible not to move to the object.
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001124186A JP3873651B2 (en) | 2001-04-23 | 2001-04-23 | Antistatic composition |
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| JP2001124186A JP3873651B2 (en) | 2001-04-23 | 2001-04-23 | Antistatic composition |
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| JP2002317174A JP2002317174A (en) | 2002-10-31 |
| JP3873651B2 true JP3873651B2 (en) | 2007-01-24 |
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| WO2019050011A1 (en) * | 2017-09-11 | 2019-03-14 | 日立化成株式会社 | Adhesive film for circuit connections and manufacturing method thereof, manufacturing method of circuit connection structure, and adhesive film housing set |
| JP7210846B2 (en) * | 2017-09-11 | 2023-01-24 | 株式会社レゾナック | Adhesive film for circuit connection, manufacturing method thereof, manufacturing method of circuit connection structure, and adhesive film housing set |
| KR102603157B1 (en) * | 2017-09-11 | 2023-11-17 | 가부시끼가이샤 레조낙 | Adhesive film receiving set and method for manufacturing the same |
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