JP5220990B2 - Adhesive composition and adhesive sheet - Google Patents

Adhesive composition and adhesive sheet Download PDF

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JP5220990B2
JP5220990B2 JP2005303082A JP2005303082A JP5220990B2 JP 5220990 B2 JP5220990 B2 JP 5220990B2 JP 2005303082 A JP2005303082 A JP 2005303082A JP 2005303082 A JP2005303082 A JP 2005303082A JP 5220990 B2 JP5220990 B2 JP 5220990B2
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繁樹 石黒
直樹 大河内
稚人 白井
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Nitto Denko Corp
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本発明は粘着剤組成物、及び該粘着剤組成物からなる粘着剤層を基材の少なくとも片面に有する粘着シートに関する。   The present invention relates to a pressure-sensitive adhesive composition and a pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer comprising the pressure-sensitive adhesive composition on at least one side of a substrate.

粘着シートは、基材の少なくとも片面に粘着剤を塗布し、乾燥して粘着剤層を形成したものである。基材として例えば電気絶縁用途において塩化ビニル系樹脂が古くから多用されており、また良好な粘着特性が得られることから粘着剤としてカルボキシル基等の酸性官能基を有する共重合体を含有するアクリル系粘着剤が用いられている(特許文献1)。   The pressure-sensitive adhesive sheet is obtained by applying a pressure-sensitive adhesive to at least one surface of a substrate and drying it to form a pressure-sensitive adhesive layer. For example, a vinyl chloride resin has been widely used as a base material for electrical insulation for a long time, and since an excellent adhesive property can be obtained, an acrylic material containing a copolymer having an acidic functional group such as a carboxyl group as an adhesive. An adhesive is used (Patent Document 1).

近年、環境問題への意識の高まりの中、環境に配慮した素材の使用が求められており、例えば、塩化ビニル系樹脂は柔軟性、耐候性、難燃性、加工性等の点で優れる反面、燃焼時の状況によってダイオキシンが発生する虞があることから脱塩化ビニル系樹脂の流れが進んでいる。ポリ塩化ビニル系樹脂に替えてポリオレフィン系樹脂が使用されることが多いが、難燃性が不十分であるため、難燃性が必要となる用途では難燃剤の添加が不可欠になる。難燃剤として最も効果の高いハロゲン系難燃剤は、前述のように燃焼時の環境負荷の問題があるため、金属水和物を多量に使用する場合が多い。   In recent years, with the growing awareness of environmental issues, the use of environmentally friendly materials has been demanded. For example, vinyl chloride resin is superior in terms of flexibility, weather resistance, flame retardancy, workability, etc. The flow of dechlorinated vinyl resin is progressing because dioxins may be generated depending on the situation during combustion. A polyolefin resin is often used in place of the polyvinyl chloride resin. However, since the flame retardancy is insufficient, the addition of a flame retardant becomes indispensable in applications that require flame retardancy. As described above, the halogen flame retardant having the highest effect as a flame retardant has a problem of environmental burden during combustion, and thus a large amount of metal hydrate is often used.

粘着シートにおいても、塩化ビニル製基材の代替を意図して、例えばポリオレフィン系樹脂中に金属水酸化物等の多価金属化合物を含有する基材を用い、粘着特性の良好なアクリル系粘着剤からなる粘着剤層を備える粘着シートの開発が検討されている(特許文献2)。
特公昭61−048556号公報 特開2001−131509号公報
Also in the pressure-sensitive adhesive sheet, an acrylic pressure-sensitive adhesive with good adhesive properties, using a base material containing a polyvalent metal compound such as a metal hydroxide in a polyolefin-based resin with the intention of replacing the base material made of vinyl chloride. Development of a pressure-sensitive adhesive sheet comprising a pressure-sensitive adhesive layer made of is studied (Patent Document 2).
Japanese Examined Patent Publication No. 61-048556 JP 2001-131509 A

本発明者らは、このような粘着シートを検討する中で、所定期間保存した後の粘着シートの特性評価を行なったところ、粘着特性が著しく低下してしまうという問題に遭遇した。さらに、本発明者らは、細径の電線等を結束するために粘着シートを巻き付けた場合に該粘着シートの端部に剥がれ(以下、「端末剥がれ」と記す)が発生し、また粘着シートを被着体に貼付した場合にも粘着特性が低下することを確認した。このような粘着特性の低下は、難燃剤、放熱剤、補強剤等の充填剤として多量の多価金属化合物が配合された、粘着シートの基材又は被着体に粘着剤層が接触する場合に顕著に現れることを本発明者らは見出した。   While examining such an adhesive sheet, the present inventors have encountered a problem that the adhesive property is remarkably lowered when the properties of the adhesive sheet after being stored for a predetermined period of time are evaluated. Furthermore, when the pressure sensitive adhesive sheet is wound to bind a thin wire or the like, the present inventors peel off at the end of the pressure sensitive adhesive sheet (hereinafter referred to as “terminal peeling”), and the pressure sensitive adhesive sheet It was confirmed that the adhesive properties also deteriorated when affixed to the adherend. Such a decrease in adhesive properties is caused when the adhesive layer comes into contact with the substrate or adherend of the adhesive sheet in which a large amount of a polyvalent metal compound is blended as a filler such as a flame retardant, a heat radiation agent, or a reinforcing agent. The present inventors have found that it appears prominently.

そこで、本発明者らは粘着特性の低下の原因究明を行った結果、次の要因で発生しているとの知見を得た。すなわち、粘着特性の低下の原因が、基材中に多価金属化合物が含まれている場合に、該多価金属化合物から生成した多価金属イオンと、粘着剤層を構成するアクリル系粘着剤中のカルボキシル基とが架橋反応を起こすことにあるとの知見を得た。それにより、粘着剤を構成する共重合体の硬化が進行し、カルボキシル基が有する良好な接着性が損なわれると推察される。   Thus, as a result of investigating the cause of the decrease in the adhesive property, the present inventors have obtained the knowledge that it is caused by the following factors. That is, when the cause of the deterioration of the adhesive property is that the base material contains a polyvalent metal compound, the polyvalent metal ion generated from the polyvalent metal compound and the acrylic adhesive that constitutes the adhesive layer The knowledge that there exists a crosslinking reaction with the carboxyl group in the inside was acquired. Thereby, it is inferred that curing of the copolymer constituting the pressure-sensitive adhesive proceeds and the good adhesiveness of the carboxyl group is impaired.

また、粘着特性の低下は粘着シートの保存時の環境によっても異なり、通常加熱等により多価金属化合物が活性化されると、多価金属イオンを生成し、これが粘着剤中のカルボキシル基等の酸性官能基と結合することにより架橋反応が進行する。水溶性の多価金属化合物は、熱だけでなく、加湿下でも多価金属イオンを発生しやすい。したがって、上記の多価金属化合物のうち、水酸化マグネシウムや水酸化アルミニウムのような水酸化物は、水溶性であり、かつ、難燃剤として多量に使用される場合が多いため、粘着シートの基材、及び/又は粘着シートを貼付すべき被着体中に、このような水酸化物が添加されている場合には、経時での粘着特性の低下が顕著になる。   In addition, the deterioration of the adhesive properties varies depending on the storage environment of the adhesive sheet, and when the polyvalent metal compound is activated by normal heating or the like, a polyvalent metal ion is generated, which is a carboxyl group in the adhesive. A cross-linking reaction proceeds by binding to an acidic functional group. A water-soluble polyvalent metal compound easily generates polyvalent metal ions not only with heat but also under humidification. Accordingly, among the above polyvalent metal compounds, hydroxides such as magnesium hydroxide and aluminum hydroxide are water-soluble and are often used in large quantities as flame retardants. When such a hydroxide is added to the adherend to which the material and / or the pressure-sensitive adhesive sheet is to be attached, the deterioration of the pressure-sensitive adhesive property with time is significant.

このような粘着特性の低下を改善すべく、以下の方法が提案されている。例えば、第1に、金属イオン封鎖剤を添加することにより、粘着シートの基材中に含まれている炭酸カルシウム等の金属イオンと、粘着剤中のカルボキシル基との架橋反応を阻害し、粘着力の低下を防止する方法が提案されている(特許第3500776号)。第2に、粘着シートの基材、又は被着体が金属系安定剤を含有する塩化ビニル系樹脂である場合に、(メタ)アクリル酸アルキルエステルと、窒素含有ビニルモノマーと、4−ヒドロキシルブチルアクリレートとからなり、かつカルボキシル基含有単量体を実質的に含まないアクリル系共重合体と、ポリイソシアネートとを含有する粘着剤を用いる方法が提案されている(特開平7−82545号公報)。第3に、粘着剤中に金属水酸化物を難燃剤として含有する場合に、凝集防止の観点から酸性基を含まないアクリル系粘着剤を用いる方法が提案されている(特開2003−105295号公報)。   In order to improve such deterioration of the adhesive property, the following methods have been proposed. For example, first, by adding a sequestering agent, the cross-linking reaction between metal ions such as calcium carbonate contained in the base material of the pressure-sensitive adhesive sheet and the carboxyl group in the pressure-sensitive adhesive is inhibited. A method for preventing a decrease in force has been proposed (Japanese Patent No. 3500776). Second, when the base material of the pressure-sensitive adhesive sheet or the adherend is a vinyl chloride resin containing a metal stabilizer, (meth) acrylic acid alkyl ester, nitrogen-containing vinyl monomer, and 4-hydroxylbutyl There has been proposed a method using a pressure-sensitive adhesive containing an acrylate copolymer that is substantially free of carboxyl group-containing monomers and polyisocyanate (Japanese Patent Laid-Open No. 7-82545). . Thirdly, when a metal hydroxide is contained as a flame retardant in the pressure-sensitive adhesive, a method using an acrylic pressure-sensitive adhesive containing no acidic group has been proposed from the viewpoint of preventing aggregation (Japanese Patent Laid-Open No. 2003-105295). Publication).

しかしながら、第1の提案は、比較的少量の多価金属化合物に対しては有効であるものの、充填剤として多価金属化合物が多量に配合された場合には、経時で架橋反応の阻害効果が失われるため、この提案では粘着特性を十分改善できない。また、第2及び第3の提案では、粘着剤が酸性官能基を含有しないため、十分な架橋を得るために長時間のエージングが必要となる上、高い粘着力を得ることが困難である。   However, although the first proposal is effective for a relatively small amount of the polyvalent metal compound, when a large amount of the polyvalent metal compound is blended as a filler, the cross-linking reaction is inhibited over time. This proposal cannot sufficiently improve the adhesive properties because it is lost. In the second and third proposals, since the pressure-sensitive adhesive does not contain an acidic functional group, long-term aging is required to obtain sufficient crosslinking, and it is difficult to obtain high adhesive strength.

以上のように、第1〜3の提案は粘着特性の低下を防止する手段としては十分ではない。前述のように、アクリル系粘着剤は、良好な粘着特性を得るために、通常極性を有する単量体を含む単量体混合物を共重合して得られる共重合体を構成成分として含有する。特に、カルボキシル基等の酸性官能基を有する単量体を含有すると、カルボキシル基は架橋点となり、反応性も高いため更なる粘着特性の向上が可能である。ゆえに、更に幅広い用途に応じた粘着剤の設計に酸性官能基含有単量体の使用は不可欠である。しかしながら、粘着シートの基材又は被着体が多価金属化合物を含有し、かつ粘着剤層を構成するアクリル系粘着剤が酸性官能基含有単量体を構成単位に含む共重合体を含有する場合に、粘着特性の低下を防止する有効な手段が未だ存在しないのが実情である。   As described above, the first to third proposals are not sufficient as means for preventing the deterioration of the adhesive property. As described above, the acrylic pressure-sensitive adhesive contains, as a constituent component, a copolymer obtained by copolymerizing a monomer mixture containing a monomer having a normal polarity in order to obtain good adhesive properties. In particular, when a monomer having an acidic functional group such as a carboxyl group is contained, the carboxyl group becomes a cross-linking point, and the reactivity is high, so that the adhesion property can be further improved. Therefore, the use of an acid functional group-containing monomer is indispensable for the design of pressure-sensitive adhesives corresponding to a wider range of applications. However, the base material or adherend of the pressure-sensitive adhesive sheet contains a polyvalent metal compound, and the acrylic pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer contains a copolymer containing an acidic functional group-containing monomer as a constituent unit. In this case, there is still no effective means for preventing the deterioration of the adhesive property.

そこで、本発明はこのような実情に鑑みなされたものであり、その解決しようとする課題は粘着シートの基材、又は被着体が多価金属化合物を含有する場合にも、粘着特性の低下防止、特に端末剥がれを防止可能な粘着剤組成物、及びこれを用いる粘着シートを提供することにある。   Therefore, the present invention has been made in view of such a situation, and the problem to be solved is a decrease in adhesive properties even when the substrate of the adhesive sheet or the adherend contains a polyvalent metal compound. It is in providing the adhesive composition which can prevent prevention, especially terminal peeling, and an adhesive sheet using the same.

本発明者らは上記課題を解決するため鋭意研究を重ねた結果、酸性官能基含有単量体と特定の単量体とを構成単位に含み、酸性官能基含有単量体の含有割合を所定範囲とした共重合体を粘着剤組成物に含有せしめることで多価金属イオンと酸性官能基との反応を抑制できることを見出し、本発明を完成するに至った。   As a result of intensive studies to solve the above problems, the present inventors include an acidic functional group-containing monomer and a specific monomer as structural units, and the content ratio of the acidic functional group-containing monomer is predetermined. It has been found that the reaction between the polyvalent metal ion and the acidic functional group can be suppressed by incorporating the copolymer in the range into the pressure-sensitive adhesive composition, and the present invention has been completed.

すなわち、本発明は以下のとおりである。
(1)(メタ)アクリル酸エステルを主成分とし、これと共重合可能な窒素含有単量体及び酸性官能基含有単量体を少なくとも含む単量体混合物を共重合することにより得られる共重合体を含有し、かつ単量体混合物100重量部に占める酸性官能基含有単量体の含有量が5重量部未満であることを特徴とする、粘着剤組成物。
(2)単量体混合物100重量部に占める窒素含有単量体の含有量が0.5〜50重量部であることを特徴とする、上記(1)記載の粘着剤組成物。
(3)窒素含有単量体がアクリルアミド化合物又はマレイミド化合物であることを特徴とする、上記(1)又は(2)記載の粘着剤組成物。
(4)水分散型であることを特徴とする、上記(1)〜(3)のいずれかに記載の粘着剤組成物。
(5)基材の片面又は両面に、上記(1)〜(4)のいずれかに記載の粘着剤組成物からなる粘着剤層が積層されていることを特徴とする、粘着シート。
(6)基材が多価金属化合物を含むことを特徴とする、上記(5)記載の粘着シート。
(7)多価金属化合物が金属水酸化物であることを特徴とする、上記(5)又は(6)記載の粘着シート。
(8)被着体に貼付するための粘着剤組成物であって、粘着剤組成物が上記(1)〜(4)のいずれかに記載の粘着剤組成物であり、かつ被着体が多価金属化合物を含むことを特徴とする、粘着剤組成物。
(9)多価金属化合物が金属水酸化物であることを特徴とする、上記(8)記載の粘着剤組成物。
(10)被着体に貼付するための粘着シートであって、粘着シートが上記(5)〜(7)のいずれかに記載の粘着シートであり、かつ被着体が多価金属化合物を含むことを特徴とする、粘着シート。
(11)多価金属化合物が金属水酸化物であることを特徴とする、上記(10)記載の粘着シート。
That is, the present invention is as follows.
(1) Copolymer obtained by copolymerizing a monomer mixture containing a (meth) acrylic acid ester as a main component and at least a nitrogen-containing monomer and an acidic functional group-containing monomer copolymerizable therewith A pressure-sensitive adhesive composition containing a coalescence and having an acidic functional group-containing monomer content of less than 5 parts by weight based on 100 parts by weight of the monomer mixture.
(2) The pressure-sensitive adhesive composition according to (1) above, wherein the content of the nitrogen-containing monomer in 100 parts by weight of the monomer mixture is 0.5 to 50 parts by weight.
(3) The pressure-sensitive adhesive composition as described in (1) or (2) above, wherein the nitrogen-containing monomer is an acrylamide compound or a maleimide compound.
(4) The pressure-sensitive adhesive composition as described in any one of (1) to (3) above, which is a water dispersion type.
(5) A pressure-sensitive adhesive sheet, wherein a pressure-sensitive adhesive layer made of the pressure-sensitive adhesive composition according to any one of the above (1) to (4) is laminated on one side or both sides of a substrate.
(6) The pressure-sensitive adhesive sheet as described in (5) above, wherein the substrate contains a polyvalent metal compound.
(7) The pressure-sensitive adhesive sheet as described in (5) or (6) above, wherein the polyvalent metal compound is a metal hydroxide.
(8) A pressure-sensitive adhesive composition for application to an adherend, wherein the pressure-sensitive adhesive composition is the pressure-sensitive adhesive composition according to any one of the above (1) to (4), and the adherend is A pressure-sensitive adhesive composition comprising a polyvalent metal compound.
(9) The pressure-sensitive adhesive composition as described in (8) above, wherein the polyvalent metal compound is a metal hydroxide.
(10) A pressure-sensitive adhesive sheet for attaching to an adherend, wherein the pressure-sensitive adhesive sheet is the pressure-sensitive adhesive sheet according to any one of (5) to (7), and the adherend includes a polyvalent metal compound. An adhesive sheet characterized by the above.
(11) The pressure-sensitive adhesive sheet as described in (10) above, wherein the polyvalent metal compound is a metal hydroxide.

本発明によれば、粘着シートの基材、又は被着体が多価金属化合物を含有する場合にも、粘着特性の低下防止、特に端末剥がれを防止可能な粘着剤組成物を提供することができる。また、本発明の粘着剤組成物を用いて粘着剤層を構成することで、経時での粘着特性の変動の少ない粘着シートを提供することができる。   ADVANTAGE OF THE INVENTION According to this invention, even when the base material of an adhesive sheet or a to-be-adhered body contains a polyvalent metal compound, the adhesive composition which can prevent the fall of an adhesive characteristic, especially can prevent terminal peeling is provided. it can. In addition, by forming the pressure-sensitive adhesive layer using the pressure-sensitive adhesive composition of the present invention, it is possible to provide a pressure-sensitive adhesive sheet with little variation in pressure-sensitive adhesive characteristics over time.

以下、本発明をその好適な実施形態に即して詳細に説明する。なお、図面の説明において同一の要素には同一の符号を付し、重複する説明を省略する。また、図示の便宜上、図面の寸法比率は説明のものと必ずしも一致しない。   Hereinafter, the present invention will be described in detail with reference to preferred embodiments thereof. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted. For the convenience of illustration, the dimensional ratios in the drawings do not necessarily match those described.

まず、本発明の粘着剤組成物について説明する。
本発明の粘着剤組成物は、(メタ)アクリル酸エステルを主成分とし、これと共重合可能な窒素含有単量体及び酸性官能基含有単量体を少なくとも含む単量体混合物を共重合することにより得られる共重合体を含有し、かつ単量体混合物100重量部中の酸性官能基含有単量体の含有量が5重量部未満であることを特徴とする。
First, the pressure-sensitive adhesive composition of the present invention will be described.
The pressure-sensitive adhesive composition of the present invention comprises a monomer mixture containing a (meth) acrylic acid ester as a main component and at least a nitrogen-containing monomer and an acidic functional group-containing monomer copolymerizable therewith. The content of the acidic functional group-containing monomer in 100 parts by weight of the monomer mixture is less than 5 parts by weight.

従来のカルボキシル基含有アクリル系共重合体を含有する粘着剤組成物においては、カルボキシル基等の酸性官能基が架橋点となるため凝集力及び接着力の向上に有効である反面、粘着剤層中のベースポリマーの架橋反応の生起による粘着特性の低下、特に端末剥がれを惹起するという問題がある。このため、本発明においては、粘着剤組成物のベースポリマーを特定の単量体混合物で構成し、該混合物中に含まれる酸性官能基含有単量体の含有量を特定量とすることを特徴とする。   In the pressure-sensitive adhesive composition containing a conventional carboxyl group-containing acrylic copolymer, an acidic functional group such as a carboxyl group is a cross-linking point, which is effective for improving cohesion and adhesion, but in the pressure-sensitive adhesive layer There is a problem in that the adhesive properties are lowered due to the cross-linking reaction of the base polymer, and particularly the terminal peeling occurs. Therefore, in the present invention, the base polymer of the pressure-sensitive adhesive composition is composed of a specific monomer mixture, and the content of the acidic functional group-containing monomer contained in the mixture is a specific amount. And

以下、共重合体の構成単位について説明する。
本発明に係る共重合体は、その構成単位の主成分として(メタ)アクリル酸アルキルエステルを含有する。(メタ)アクリル酸アルキルエステルとしては、下記一般式(1)で表される化合物が好適に使用される。式(1)中、Rは水素原子又はメチル基を示し、Rは炭素数2〜14のアルキル基を示す。
CH=C(R)COOR (1)
Hereinafter, the structural unit of a copolymer is demonstrated.
The copolymer according to the present invention contains (meth) acrylic acid alkyl ester as a main component of the structural unit. As the (meth) acrylic acid alkyl ester, a compound represented by the following general formula (1) is preferably used. In the formula (1), R 1 represents a hydrogen atom or a methyl group, and R 2 represents an alkyl group having 2 to 14 carbon atoms.
CH 2 = C (R l) COOR 2 (1)

で示されるアルキル基は、炭素数2〜14であれば、直鎖状、分岐状及び環状のいずれの形態であってもよい。Rとしては、例えば、エチル基、プロピル基、イソプロピル基、ブチル基、イソブチル基、イソアミル基、へキシル基、へブチル基、2−エチルへキシル基、イソオクチル基、イソノニル基、イソデシル基等が挙げられる。なかでも、Rとしては、炭素数2〜10のアルキル基が好ましく、ブチル基、2−エチルへキシル基等の炭素数4〜8のアルキル基がより好ましい。Rの炭素数が上記範囲外であると、粘着力が不十分となり粘着剤として機能し難くなる。なお、上記(メタ)アクリル酸アルキルエステルは単独で又は2種以上組み合わせて使用できる。例えば、(メタ)アクリル酸アルキルエステルとして、アクリル酸ブチルを単独で、又はアクリル酸ブチルとアクリル酸2−エチルへキシルとを組み合わせて使用できる。タック感を得るにはガラス転移温度を低くすることの可能なアクリル酸2−エチルへキシルのような単量体を用いることが望ましく、また端末剥がれ抑制の点からガラス転移温度を比較的高くすることの可能なアクリル酸ブチルが好適に使用される。 As long as the alkyl group represented by R 2 has 2 to 14 carbon atoms, the alkyl group may be any of linear, branched and cyclic forms. Examples of R 2 include an ethyl group, a propyl group, an isopropyl group, a butyl group, an isobutyl group, an isoamyl group, a hexyl group, a butyl group, a 2-ethylhexyl group, an isooctyl group, an isononyl group, and an isodecyl group. Can be mentioned. Among these, as R 2, preferably an alkyl group having 2 to 10 carbon atoms, a butyl group, more preferably an alkyl group having 4-8 carbon atoms such as 2-ethylhexyl group. When the carbon number of R 2 is outside the above range, the adhesive strength is insufficient and it becomes difficult to function as an adhesive. In addition, the said (meth) acrylic-acid alkylester can be used individually or in combination of 2 or more types. For example, as the (meth) acrylic acid alkyl ester, butyl acrylate can be used alone, or butyl acrylate and 2-ethylhexyl acrylate can be used in combination. It is desirable to use a monomer such as 2-ethylhexyl acrylate that can lower the glass transition temperature in order to obtain a tack feeling, and the glass transition temperature is made relatively high in terms of suppressing terminal peeling. The possible butyl acrylate is preferably used.

また、本発明に係る共重合体は、その構成単位として上記(メタ)アクリル酸アルキルエステルと共重合可能な窒素含有単量体(以下、単に「窒素含有単量体」という)を含有する。窒素含有単量体を含有することにより、凝集力及び接着力の向上が可能になるとともに、塩基性に保つことで多価金属化合物による影響を緩和することができる。   Further, the copolymer according to the present invention contains a nitrogen-containing monomer copolymerizable with the above (meth) acrylic acid alkyl ester (hereinafter, simply referred to as “nitrogen-containing monomer”) as a structural unit. By containing the nitrogen-containing monomer, the cohesive force and the adhesive force can be improved, and the influence of the polyvalent metal compound can be reduced by keeping the basicity.

窒素含有単量体としては、例えば、(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−ジメチル(メタ)アクリルアミド、N−メチロール(メタ)アクリルアミド、N−メトキシメチル(メタ)アクリルアミド、N−ブトキシメチル(メタ)アクリルアミド、N,N−メチレンビス(メタ)アクリルアミド、N−イソプロピルアクリルアミド、N,N−ジメチルアミノプロピルアクリルアミド等のアミド基含有単量体;(メタ)アクリル酸ジメチルアミノエチル、(メタ)アクリル酸ジエチルアミノエチル、(メタ)アクリル酸t−ブチルアミノエチル等のアミノ基含有単量体;その他、(メタ)アクリロニトリル、N−(メタ)アクリロイルモルホリン、N−ビニル−2−ピロリドン、N−ビニルカプロラクタム、N−シクロへキシルマレイミド、N−フェニルマレイミド等が挙げられる。   Examples of the nitrogen-containing monomer include (meth) acrylamide, N, N-diethyl (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N-methylol (meth) acrylamide, and N-methoxymethyl (meth). Amide group-containing monomers such as acrylamide, N-butoxymethyl (meth) acrylamide, N, N-methylenebis (meth) acrylamide, N-isopropylacrylamide, N, N-dimethylaminopropylacrylamide; dimethylamino (meth) acrylate Amino group-containing monomers such as ethyl, diethylaminoethyl (meth) acrylate, t-butylaminoethyl (meth) acrylate; others, (meth) acrylonitrile, N- (meth) acryloylmorpholine, N-vinyl-2- Pyrrolidone, N-vinyl caprolacta , Hexyl maleimide to N- cyclopropyl, N- phenylmaleimide, and the like.

単量体混合物100重量部中の窒素含有単量体の配合量は、通常0.5〜50重量部、好ましくは1〜50重量部、より好ましくは1〜35重量部、特に好ましくは1.5〜15重量部である。0.5重量部よりも少ないと多価金属化合物の影響を排除し難くなる傾向にあり、また50重量部よりも多いと接着力の低下を招きやすくなる傾向にある。   The compounding amount of the nitrogen-containing monomer in 100 parts by weight of the monomer mixture is usually 0.5 to 50 parts by weight, preferably 1 to 50 parts by weight, more preferably 1 to 35 parts by weight, and particularly preferably 1. 5 to 15 parts by weight. When the amount is less than 0.5 part by weight, the influence of the polyvalent metal compound tends to be difficult to eliminate. When the amount is more than 50 parts by weight, the adhesive force tends to be lowered.

さらに、本発明に係る共重合体は、その構成単位として(メタ)アクリル酸アルキルエステルと共重合可能な酸性官能基含有単量体を含有する。酸性官能基含有単量体としては、例えば、アクリル酸、メタクリル酸、イタコン酸、マレイン酸、クロトン酸、無水マレイン酸等のカルボキシル基含有単量体又はその酸無水物、ビニルスルホン酸、スチレンスルホン酸、スルホエチル(メタ)アクリレート等のスルホン酸基含有不飽和単量体等が挙げられる。   Furthermore, the copolymer according to the present invention contains an acidic functional group-containing monomer copolymerizable with (meth) acrylic acid alkyl ester as a structural unit. Examples of the acidic functional group-containing monomer include carboxyl group-containing monomers such as acrylic acid, methacrylic acid, itaconic acid, maleic acid, crotonic acid, and maleic anhydride, or acid anhydrides thereof, vinyl sulfonic acid, and styrene sulfone. Examples thereof include sulfonic acid group-containing unsaturated monomers such as acid and sulfoethyl (meth) acrylate.

アクリル酸等の酸性官能基含有単量体は、上記のごとく多価金属化合物と反応するため、本来、配合することは望ましくないが、高強度の接着力を得るためには不可欠である。このため、本発明では、酸性官能基含有単量体を以下の範囲で含有することにより、凝集力及び接着力を向上することができ、また窒素含有単量体と併用することで、多価金属化合物の影響を抑制することができることを見出した。さらに、エマルション重合をする場合には、酸性官能基含有単量体の添加で、エマルション粒子の機械的安定性を改善することができる。   Since an acidic functional group-containing monomer such as acrylic acid reacts with the polyvalent metal compound as described above, it is originally not desirable to add it, but it is indispensable for obtaining a high strength adhesive force. For this reason, in this invention, cohesion force and adhesive force can be improved by containing an acidic functional group-containing monomer in the following range, and when used in combination with a nitrogen-containing monomer, It has been found that the influence of metal compounds can be suppressed. Furthermore, when emulsion polymerization is performed, the mechanical stability of the emulsion particles can be improved by adding an acidic functional group-containing monomer.

単量体混合物100重量部中の酸性官能基含有単量体の配合量は5.0重量部未満であるが、好ましくは0.1〜2.0重量部、特に好ましくは0.2〜1.0重量部である。5.0重量部よりも多いと多価金属化合物の影響を受け、経時で架橋反応が進行しやすくなる。なお、高強度の接着力を得るためには、0.05重量部以上含有することが望ましい。   The amount of the acidic functional group-containing monomer in 100 parts by weight of the monomer mixture is less than 5.0 parts by weight, preferably 0.1 to 2.0 parts by weight, particularly preferably 0.2 to 1 part. 0.0 part by weight. When the amount is more than 5.0 parts by weight, the cross-linking reaction easily proceeds with time due to the influence of the polyvalent metal compound. In order to obtain a high strength adhesive strength, it is desirable to contain 0.05 parts by weight or more.

また、本発明に係る共重合体は、凝集力等の特性を高めるために、必要に応じて上記以外の官能基含有単量体を構成単位として含有することができる。かかる官能基含有単量体としては、例えば、(メタ)アクリル酸2−ヒドロキシエチル、(メタ)アクリル酸2−ヒドロキシプロピル、(メタ)アクリル酸2−ヒドロキシブチル等の水酸基含有単量体;(メタ)アクリル酸メチル、酢酸ビニル等のビニルエステル類;スチレン、ビニルトルエン等の芳香族ビニル化合物;シクロぺンチルジ(メタ)アクリレート、イソボルニル(メタ)アクリレート等の環式アルコールの(メタ)アクリル酸エステル類;ネオペンチルグリコールジ(メタ)アクリレート、ヘキサンジオールジ(メタ)アクリレート、プロピレングリコールジ(メタ)アクリレート、トリメチロールプロパントリ(メタ)アクリレート、テトラメチロールメタントリ(メタ)アクリレート、ジペンタエリスリトールヘキサ(メタ)アクリレート等の多価アルコールの(メタ)アクリル酸エステル類、(メタ)アクリル酸グリシジル等のグリシジル基含有単量体等が挙げられる。これらの単量体は単独で又は2種以上を組み合わせて使用することができる。   In addition, the copolymer according to the present invention can contain a functional group-containing monomer other than the above as a constituent unit, if necessary, in order to enhance characteristics such as cohesive force. Examples of such functional group-containing monomers include hydroxyl group-containing monomers such as 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate; Vinyl esters such as methyl methacrylate and vinyl acetate; aromatic vinyl compounds such as styrene and vinyl toluene; cyclic alcohol (meth) acrylates such as cyclopentyl di (meth) acrylate and isobornyl (meth) acrylate Neopentyl glycol di (meth) acrylate, hexanediol di (meth) acrylate, propylene glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, tetramethylolmethane tri (meth) acrylate, dipentaerythritol hexa ( Me ) Polyvalent (meth) acrylic acid esters of alcohols such as acrylate, (meth) glycidyl group-containing monomers such as glycidyl acrylate. These monomers can be used alone or in combination of two or more.

単量体混合物100重量部中の上記官能基含有単量体の配合量は、通常0.01〜10重量部、好ましくは0.1〜5重量部、より好ましくは0.2〜2重量部である。かかる配合量とすることで、凝集力及び粘着力の向上が可能になる。   The amount of the functional group-containing monomer in 100 parts by weight of the monomer mixture is usually 0.01 to 10 parts by weight, preferably 0.1 to 5 parts by weight, more preferably 0.2 to 2 parts by weight. It is. By setting it as this compounding quantity, the improvement of cohesion force and adhesive force is attained.

また、共重合体の重合方法は特に限定されるものではなく、通常の重合方法を採用することができる。重合方法としては、例えば、溶液重合、エマルション重合等が挙げられる。エマルション重合の方式としては、一般的な一括重合、連続滴下重合、分割滴下重合等を採用できる。これらの重合方法においては、通常知られる添加剤を用いてもよく、重合に用いる重合開始剤としては、例えば、2,2′−アゾビスイソブチロニトリル、2,2′−アゾビス(2−メチルプロビオンアミジン)二硫酸塩、2,2′−アゾビス(2−アミジノプロパン)ジヒドロクロライド、2,2′−アゾビス[2−(5−メチル−2−イミダゾリン−2−イル)プロパン]ジヒドロクロライド、2,2′−アゾビス(N,N′−ジメチレンイソブチルアミジン)等のアゾ系開始剤;過硫酸カリウム、過硫酸アンモニウム等の過硫酸塩;ベンゾイルパーオキサイド、t−ブチルハイドロパーオキサイド、過酸化水素等の過酸化物系開始剤;フェニル置換エタン等の置換エタン系開始剤;芳香族カルボニル化合物;過硫酸塩と亜硫酸水素ナトリウムとの組み合わせ、過酸化物とアスコルビン酸ナトリウムとの組み合わせ等のレドックス系開始剤等が挙げられるが、これらに限定されるものではない。なお、重合開始剤の配合量は、単量体混合物100重量部に対して、例えば0.005〜1重量部程度である。   Moreover, the polymerization method of a copolymer is not specifically limited, A normal polymerization method is employable. Examples of the polymerization method include solution polymerization and emulsion polymerization. As a method of emulsion polymerization, general batch polymerization, continuous dropping polymerization, divided dropping polymerization and the like can be employed. In these polymerization methods, commonly known additives may be used. Examples of the polymerization initiator used for the polymerization include 2,2'-azobisisobutyronitrile, 2,2'-azobis (2- Methylprobionamidine) disulfate, 2,2'-azobis (2-amidinopropane) dihydrochloride, 2,2'-azobis [2- (5-methyl-2-imidazolin-2-yl) propane] dihydrochloride Azo initiators such as 2,2'-azobis (N, N'-dimethyleneisobutylamidine); persulfates such as potassium persulfate and ammonium persulfate; benzoyl peroxide, t-butyl hydroperoxide, peroxidation Peroxide-based initiators such as hydrogen; Substituted ethane-based initiators such as phenyl-substituted ethane; Aromatic carbonyl compounds; Persulfates and sodium bisulfite Combination of um, but redox initiators such as a combination of peroxide and sodium ascorbic acid, but is not limited thereto. In addition, the compounding quantity of a polymerization initiator is about 0.005-1 weight part with respect to 100 weight part of monomer mixtures.

エマルション重合の場合は界面活性剤を更に用いてもよく、例えば、ラウリル硫酸ナトリウム、ラウリル硫酸アンモニウム、ドデシルベンゼンスルホン酸ナトリウム、ボリオキシエチレンアルキルエーテル硫酸ナトリウム、ポリオキシエチレンアルキルフェニルエーテル硫酸アンモニウム、ポリオキシエチレンアルキルフェニルエーテル硫酸ナトリウム、ポリオキシエチレンアルキルスルホコハク酸ナトリウム等のアニオン系乳化剤;ポリオキシエチレンアルキルエーテル、ポリオキシエチレンアルキルフェニルエーテル、ポリオキシエチレン脂肪酸エステル、ポリオキシエチレンポリオキシプロピレンブロックポリマー等のノニオン系乳化剤等が挙げられる。なお、乳化剤の配合量は、単量体混合物100重量部に対して、通常0.1〜5重量部、好ましくは0.4〜3重量部である。   In the case of emulsion polymerization, a surfactant may be further used. For example, sodium lauryl sulfate, ammonium lauryl sulfate, sodium dodecylbenzenesulfonate, sodium polyoxyethylene alkyl ether sulfate, polyoxyethylene alkylphenyl ether ammonium sulfate, polyoxyethylene alkyl Anionic emulsifiers such as sodium phenyl ether sulfate and sodium polyoxyethylene alkyl sulfosuccinate; Nonionic emulsifiers such as polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene fatty acid ester, polyoxyethylene polyoxypropylene block polymer Etc. In addition, the compounding quantity of an emulsifier is 0.1-5 weight part normally with respect to 100 weight part of monomer mixtures, Preferably it is 0.4-3 weight part.

また、これら(ラウリル硫酸ナトリウム、ラウリル硫酸アンモニウム、ドデシルベンゼンスルホン酸ナトリウム等のアニオン系乳化剤や、ポリオキシエチレンアルキルエーテル、ポリオキシエチレンアルキルフェニルエーテル、ポリオキシエチレン脂肪酸エステル、ポリオキシエチレンポリオキシプロピレンブロックボリマー等のノニオン系乳化剤等の乳化剤)にプロペニル基やアリルエーテル基等のラジカル重合性官能基(ラジカル反応性基)を導入した反応性乳化剤を用いることもできる。反応性乳化剤を用いることにより、乳化剤が共重合体の分子鎖中に結合するため、粘着剤層の表面への乳化剤の染み出しによる粘着特性、特に端末剥がれを抑制することができる。   These (anionic emulsifiers such as sodium lauryl sulfate, ammonium lauryl sulfate, sodium dodecylbenzene sulfonate, polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene fatty acid ester, polyoxyethylene polyoxypropylene block polymer) A reactive emulsifier in which a radical polymerizable functional group (radical reactive group) such as a propenyl group or an allyl ether group is introduced into an emulsifier such as a nonionic emulsifier such as a mer may also be used. By using the reactive emulsifier, since the emulsifier is bonded in the molecular chain of the copolymer, it is possible to suppress adhesion characteristics due to the emulsification of the emulsifier to the surface of the pressure-sensitive adhesive layer, in particular, terminal peeling.

また、連鎖移動剤を必要により含有してもよい。連鎖移動剤を含有することにより、共重合物の分子量を調節することができる。連鎖移動剤としては、例えば、1−ドデカンチオール、メルカプト酢酸、2−メルカプトエタノール、チオグリコール酸2−エチルへキシル、2,3−ジメルカプト−1−プロパノール等のメルカプタン類等が挙げられる。これら連鎖移動剤は、適宜、単独で又は2種以上を組み合わせて用いることができる。なお、連鎖移動剤の配合量は、単量体混合物100重量部に対して、例えば、0.001〜0.5重量部程度である。連鎖移動剤を過剰に添加すると、共重合体の分子量が小さくなり過ぎるため、端末剥がれを引き起こしやすくなる。   Moreover, you may contain a chain transfer agent as needed. By containing a chain transfer agent, the molecular weight of the copolymer can be adjusted. Examples of the chain transfer agent include 1-dodecanethiol, mercaptoacetic acid, 2-mercaptoethanol, 2-ethylhexyl thioglycolate, mercaptans such as 2,3-dimercapto-1-propanol, and the like. These chain transfer agents can be used alone or in combination of two or more. In addition, the compounding quantity of a chain transfer agent is about 0.001-0.5 weight part with respect to 100 weight part of monomer mixtures. If the chain transfer agent is added excessively, the molecular weight of the copolymer becomes too small, and terminal peeling is likely to occur.

本発明においては、粘着剤組成物の用途に応じて架橋剤を用いてもよい。架橋剤としては、通常用いる架橋剤を使用することができ、例えば、イソシアネート系架橋剤、エポキシ系架橋剤、オキサゾリン系架橋剤、アジリジン系架橋剤、金属キレート系架橋剤等が挙げられる。   In this invention, you may use a crosslinking agent according to the use of an adhesive composition. As a crosslinking agent, the crosslinking agent used normally can be used, For example, an isocyanate type crosslinking agent, an epoxy-type crosslinking agent, an oxazoline type crosslinking agent, an aziridine type crosslinking agent, a metal chelate type crosslinking agent etc. are mentioned.

また、エマルション重合では、上記(メタ)アクリル酸アルキルエステルと共重合可能なシラン系単量体を含有させることにより、シラノール架橋させる手法を用いてもよい。シラン系単量体としては、ケイ素原子を有するラジカル重合性化合物であれば特に限定されないが、(メタ)アクリル酸アルキルエステルとの反応性に優れる点で(メタ)アクリロイルオキシアルキルシラン誘導体等の(メタ)アクリロイル基を有するシラン化合物が好適である。   In emulsion polymerization, a silanol crosslinking method may be used by including a silane monomer copolymerizable with the above (meth) acrylic acid alkyl ester. The silane monomer is not particularly limited as long as it is a radically polymerizable compound having a silicon atom, but (meth) acryloyloxyalkylsilane derivatives such as (meth) acryloyloxyalkylsilane derivatives and the like in terms of excellent reactivity with (meth) acrylic acid alkyl ester ( Silane compounds having a (meth) acryloyl group are preferred.

具体的には、3−メタクリロイルオキシプロピルトリメトキシシラン、3−アクリロイルオキシプロピルトリメトキシシラン、3−メタクリロイルオキシプロピルトリエトキシシラン、3−アクリロイルオキシプロピルトリエトキシシラン、3−メタクリロイルオキシプロピルメチルジメトキシシラン、3−アクリロイルオキシプロピルメチルジメトキシシラン、3−メタクリロイルオキシプロピルメチルジエトキシシラン、3−アクリロイルオキシプロピルメチルジエトキシシラン等が挙げられる。これらのシラン系単量体は単独で又は2種以上組み合わせて使用できる。また、上記以外のシラン系単量体として、例えば、ビニルトリメトキシシラン、ビニルトリエトキシシラン、4−ビニルブチルトリメトキシシラン、4−ビニルブチルトリエトキシシラン、8−ビニルオクチルトリメトキシシラン、8−ビニルオクチルトリエトキシシラン、10−メタクリロイルオキシデシルトリメトキシシラン、10−アクリロイルオキシデシルトリメトキシシラン、10−メタクリロイルオキシデシルトリエトキシシラン、10−アクリロイルオキシデシルトリエトキシシラン等も使用できる。シラン系単量体の配合量は(メタ)アクリル酸アルキルエステルの種類や用途等に応じて適宜選択できるが、単量体混合物100重量部に対して、通常0.005〜1重量部、好ましくは0.008〜0.5重量部、より好ましくは0.01〜0.2重量部である。   Specifically, 3-methacryloyloxypropyltrimethoxysilane, 3-acryloyloxypropyltrimethoxysilane, 3-methacryloyloxypropyltriethoxysilane, 3-acryloyloxypropyltriethoxysilane, 3-methacryloyloxypropylmethyldimethoxysilane, Examples include 3-acryloyloxypropylmethyldimethoxysilane, 3-methacryloyloxypropylmethyldiethoxysilane, and 3-acryloyloxypropylmethyldiethoxysilane. These silane monomers can be used alone or in combination of two or more. Examples of silane monomers other than the above include vinyltrimethoxysilane, vinyltriethoxysilane, 4-vinylbutyltrimethoxysilane, 4-vinylbutyltriethoxysilane, 8-vinyloctyltrimethoxysilane, 8- Vinyloctyltriethoxysilane, 10-methacryloyloxydecyltrimethoxysilane, 10-acryloyloxydecyltrimethoxysilane, 10-methacryloyloxydecyltriethoxysilane, 10-acryloyloxydecyltriethoxysilane, and the like can also be used. The blending amount of the silane monomer can be appropriately selected according to the type and use of the (meth) acrylic acid alkyl ester, but is usually 0.005 to 1 part by weight, preferably 100 parts by weight of the monomer mixture. Is 0.008 to 0.5 parts by weight, more preferably 0.01 to 0.2 parts by weight.

シラン系単量体は、乳化時及び/又は乳化重合時に加水分解を起こし、重合後に水分散型粘着剤組成物として非常に安定な状態で存在する。粘着剤組成物を基材等に塗布し水分等の揮発成分を乾燥機等で蒸発させる際に、シラン系単量体に由来のシラノール基同士が縮合反応を起こし、共重合体が架橋する。この縮合反応は非常に速い反応であり、乾燥が完了すると同時に架橋反応もほぼ完了している。したがって、乾燥後に加熱エージングをする必要がないため、製造工程の短縮、製造コストの低減に非常に有利である。また、粘着剤組成物をそのまま乾燥するだけで架橋反応まで行えるため、架橋剤添加時の配合ミスや分散不良等による粘着特性への影響を排除できる。水分散型粘着剤組成物の架橋反応は、通常エマルション粒子の外側のみで反応が起こるため凝集性に劣るが、シラン系単量体による架橋反応はエマルション粒子の内外で均一に起こるため、凝集性はもとより、系全体の物性のバランスが非常に良好となる。   The silane monomer undergoes hydrolysis during emulsification and / or emulsion polymerization, and exists in a very stable state as a water-dispersed pressure-sensitive adhesive composition after polymerization. When the pressure-sensitive adhesive composition is applied to a substrate or the like and volatile components such as moisture are evaporated with a dryer or the like, silanol groups derived from the silane monomer cause a condensation reaction, and the copolymer is crosslinked. This condensation reaction is a very fast reaction, and the crosslinking reaction is almost completed at the same time as the drying is completed. Accordingly, there is no need to perform heat aging after drying, which is very advantageous for shortening the manufacturing process and reducing the manufacturing cost. In addition, since the crosslinking reaction can be performed by simply drying the pressure-sensitive adhesive composition as it is, the influence on the pressure-sensitive adhesive properties due to mixing errors and poor dispersion when the crosslinking agent is added can be eliminated. The cross-linking reaction of the water-dispersed pressure-sensitive adhesive composition is inferior in agglomeration because the reaction usually takes place only outside the emulsion particles, but the cross-linking reaction by the silane monomer occurs uniformly inside and outside the emulsion particles. Besides, the balance of physical properties of the whole system is very good.

また、本発明においては、粘着剤組成物の用途に応じて粘着付与剤を含有することができる。粘着付与剤としては、ロジン系樹脂、テルペン系樹脂、脂肪族系石油樹脂、芳香族系石油樹脂、共重合系石油樹脂、脂環族系石油樹脂、キシレン樹脂、エラストマー等を挙げることができる。
さらに、本発明の粘着剤組成物には、必要に応じて粘着剤に通常使用される添加剤、例えば、老化防止剤、充填剤、顔料、着色剤等が添加されていてもよく、水分散型である場合にはpHを調整するための塩基(例えば、アンモニア水)が添加されていてもよい。
Moreover, in this invention, a tackifier can be contained according to the use of an adhesive composition. Examples of the tackifier include rosin resins, terpene resins, aliphatic petroleum resins, aromatic petroleum resins, copolymer petroleum resins, alicyclic petroleum resins, xylene resins, elastomers, and the like.
Furthermore, the pressure-sensitive adhesive composition of the present invention may be added with additives usually used for pressure-sensitive adhesives as required, for example, anti-aging agents, fillers, pigments, colorants, etc. In the case of a mold, a base (for example, aqueous ammonia) for adjusting pH may be added.

次に、本発明の粘着シートについて説明する。
図1は、本発明の粘着シートの一実施形態を示す断面図である。粘着シート10は、支持体1と、該支持体1の片面に形成された粘着剤層3とを備えるものである。粘着剤層3はそれ自体が粘着性を有しており、前述した本発明の水分散型粘着剤組成物から構成されていることを特徴とする。粘着シート10は、テープ、シート及びフィルムのいずれの形態であってもよい。
Next, the pressure-sensitive adhesive sheet of the present invention will be described.
FIG. 1 is a cross-sectional view showing an embodiment of the pressure-sensitive adhesive sheet of the present invention. The pressure-sensitive adhesive sheet 10 includes a support 1 and a pressure-sensitive adhesive layer 3 formed on one side of the support 1. The pressure-sensitive adhesive layer 3 itself has adhesiveness, and is characterized by being composed of the water-dispersed pressure-sensitive adhesive composition of the present invention described above. The pressure-sensitive adhesive sheet 10 may be in any form of a tape, a sheet, and a film.

基材1としては特に限定されるものではないが、例えば、ポリプロピレンフィルム、エチレン−プロピレン共重合体フィルム、ポリエステルフィルム、ポリ塩化ビニル等のプラスチックフィルム類;和紙、クラフト紙等の紙類;綿布、スフ布等の布類;ポリエステル不織布、ビニロン不織布等の不織布類;金属箔等が挙げられる。上記プラスチックフィルムは、無延伸フィルム及び延伸(一軸延伸又は二軸延伸)フィルムのいずれであってもよい。   Although it does not specifically limit as the base material 1, For example, Plastic films, such as a polypropylene film, an ethylene-propylene copolymer film, a polyester film, a polyvinyl chloride; Papers, such as Japanese paper and a kraft paper; Cotton cloth, Examples thereof include cloths such as soft cloth; nonwoven fabrics such as polyester nonwoven fabric and vinylon nonwoven fabric; metal foils and the like. The plastic film may be an unstretched film or a stretched (uniaxially stretched or biaxially stretched) film.

また、基材1は多価金属化合物を含んでいてもよく、多価金属化合物を含む基材1としては、例えば上記材質に多価金属化合物を練り込んで成形されたものが挙げられる。多価金属化合物を構成する多価金属原子としては、Al、Cr、Zr、Co、Cu、Fe、Ni、V、Zn、In、Ca、Mg、Mn、Y、Ce、Sr、Ba、Mo、La、Sn、Ti等が挙げられ、これらの金属は2価又はそれ以上の価数の金属イオンとなりうる。多価金属化合物としては特に限定されるものではないが、具体的には、酢酸アルミニウム、水酸化アルミニウム、硫酸アルミニウム、塩化アルミニウム、珪酸アルミニウム、水酸化カルシウム、炭酸カルシウム、塩化カルシウム、硫酸カルシウム、硝酸カルシウム、リン酸カルシウム、酢酸カルシウム、水酸化マグネシウム、炭酸マグネシウム、塩化マグネシウム、硫酸マグネシウム、硝酸マグネシウム、リン酸マグネシウム、酢酸マグネシウム、水酸化アルミナマグネシウム、メタ珪酸アルミン酸マグネシウム、珪酸アルミン酸マグネシウム、安息香酸カルシウム、プロピオン酸カルシウム、クエン酸カルシウム、乳酸カルシウム、ピロリン酸カルシウム、乳酸亜鉛、酢酸亜鉛、安息香酸亜鉛、乳酸マグネシウム、クエン酸マグネシウム、ジブチル錫ジクロライド、ジブチル錫ジアセテート、塩化第一鉄、安息香酸アルミニウム、乳酸アルミニウム等が挙げられる。   The substrate 1 may contain a polyvalent metal compound. Examples of the substrate 1 containing the polyvalent metal compound include those formed by kneading the polyvalent metal compound into the above material. As the polyvalent metal atoms constituting the polyvalent metal compound, Al, Cr, Zr, Co, Cu, Fe, Ni, V, Zn, In, Ca, Mg, Mn, Y, Ce, Sr, Ba, Mo, La, Sn, Ti and the like can be mentioned, and these metals can be divalent or higher valent metal ions. Although it does not specifically limit as a polyvalent metal compound, Specifically, aluminum acetate, aluminum hydroxide, aluminum sulfate, aluminum chloride, aluminum silicate, calcium hydroxide, calcium carbonate, calcium chloride, calcium sulfate, nitric acid Calcium, calcium phosphate, calcium acetate, magnesium hydroxide, magnesium carbonate, magnesium chloride, magnesium sulfate, magnesium nitrate, magnesium phosphate, magnesium acetate, magnesium hydroxide aluminate, magnesium magnesium metasilicate, magnesium aluminate silicate, calcium benzoate, Calcium propionate, calcium citrate, calcium lactate, calcium pyrophosphate, zinc lactate, zinc acetate, zinc benzoate, magnesium lactate, magnesium citrate, Butyltin dichloride, dibutyltin diacetate, ferrous chloride, aluminum benzoate, aluminum lactate, and the like.

また、基材1の粘着剤組成物を塗布すべき面には、通常使用される下塗剤やコロナ放電方式等による表面処理が施されていてもよい。
基材1の厚みは目的に応じて適宜選択できるが、端末剥がれの一因となる耐反発性は基材1の曲げ弾性率と厚さの影響を多分に受けるため、厚さを可及的に薄くした方がよい。一般的には、基材1の厚さは通常10〜500μm、好ましくは30〜400μm、より好ましくは50〜300μmである。
Moreover, the surface which should apply | coat the adhesive composition of the base material 1 may be given surface treatment by the primer used normally, a corona discharge system, etc.
Although the thickness of the base material 1 can be appropriately selected according to the purpose, the rebound resistance that contributes to terminal peeling is largely affected by the bending elastic modulus and the thickness of the base material 1, and therefore the thickness is made as much as possible. It is better to make it thinner. In general, the thickness of the substrate 1 is usually 10 to 500 μm, preferably 30 to 400 μm, more preferably 50 to 300 μm.

粘着シート10は、例えば、前述した本発明の粘着剤組成物を基材1上に塗布、乾燥して粘着剤層3を形成することにより得られる。粘着剤組成物が架橋剤を含む場合には、通常、加熱により熱架橋して粘着剤層3を形成する。熱架橋は、慣用の方法、例えば、架橋剤の種類に応じて架橋反応が進行する温度にまで加熱することにより行われる。
基材1上に粘着剤組成物を塗布する場合には、慣用のコーター、例えば、グラビヤロールコーター、リバースロールコーター、キスロールコーター、ディップロールコーター、バーコーター、ナイフコーター、スプレーコーター等を用いることができる。この場合、乾燥後の粘着剤層3の厚みが、通常5〜100μm程度、好ましくは10〜60μm程度、より好ましくは15〜40μm程度となるように水分散型粘着剤組成物を塗布する。
The pressure-sensitive adhesive sheet 10 is obtained, for example, by forming the pressure-sensitive adhesive layer 3 by applying the above-described pressure-sensitive adhesive composition of the present invention on the substrate 1 and drying it. When the pressure-sensitive adhesive composition contains a crosslinking agent, the pressure-sensitive adhesive layer 3 is usually formed by thermal crosslinking by heating. Thermal crosslinking is performed by a conventional method, for example, by heating to a temperature at which a crosslinking reaction proceeds according to the type of crosslinking agent.
When applying the pressure-sensitive adhesive composition on the substrate 1, use a conventional coater such as a gravure roll coater, reverse roll coater, kiss roll coater, dip roll coater, bar coater, knife coater, spray coater, etc. Can do. In this case, the water-dispersed pressure-sensitive adhesive composition is applied so that the thickness of the pressure-sensitive adhesive layer 3 after drying is usually about 5 to 100 μm, preferably about 10 to 60 μm, more preferably about 15 to 40 μm.

また、粘着剤層3上には剥離ライナーを備えていてもよい。剥離ライナーとしては、上記基材1で例示した材料等が挙げられる。剥離ライナーの表面には粘着剤層3からの剥離性を高めるため、必要に応じてシリコーン処理、長鎖アルキル処理、フッ素処理等の離型処理が施されていてもよい。なお、上記実施形態においては、基材1の片面に粘着剤層3が形成された粘着シート10について説明したが、本発明はこれに限定されるものではなく、基材1の両面に粘着剤層3が形成された粘着シートであってもよい。   A release liner may be provided on the pressure-sensitive adhesive layer 3. Examples of the release liner include the materials exemplified for the substrate 1. The surface of the release liner may be subjected to release treatment such as silicone treatment, long-chain alkyl treatment, and fluorine treatment as necessary in order to enhance the peelability from the pressure-sensitive adhesive layer 3. In addition, in the said embodiment, although the adhesive sheet 10 in which the adhesive layer 3 was formed in the single side | surface of the base material 1 was demonstrated, this invention is not limited to this, It is an adhesive on both surfaces of the base material 1. The adhesive sheet in which the layer 3 was formed may be sufficient.

従来のカルボキシル基等を含有するアクリル系粘着剤により形成された粘着剤層を備える粘着シートの基材に多価金属化合物を含む場合には、粘着シートの保存条件が、例えば高温多湿等の悪条件であると経時で粘着特性が低下するため、被着体に貼付した後から端末剥がれ等の不具合を生じる。また、粘着シートの基材に多価金属化合物を含む場合には、保存条件が、例えば標準状態のような比較的良好な条件であっても、被着体中に多価金属化合物が含まれると、貼付直後は良好でも、徐々に端末剥がれ等の不具合を生じることになる。他方、粘着シートの基材に多価金属化合物を含まない場合には粘着シートの保存条件で粘着特性が低下することはないが、被着体中に多価金属化合物が含まれると、使用条件が、例えば高温多湿下等の悪条件であると経時で粘着特性が低下し、徐々に端末剥がれ等の不具合を生じることになる。これに対し、本発明の粘着シートにおいては、粘着剤層を構成する粘着剤組成物のベースポリマーが特定の単量体単位からなるため、粘着剤層が多価金属化合物と接触するいかなる環境(保存又は使用する環境)においても、端末剥がれを十分に抑制することができる。よって、本発明によれば粘着特性の変化が極めて少ない粘着シートとすることができる。なお、被着体としては、例えば、各種プラスチック材料、金属材料、紙材、繊維材料等が挙げられる。   When the base material of the pressure-sensitive adhesive sheet having a pressure-sensitive adhesive layer formed of an acrylic pressure-sensitive adhesive containing a carboxyl group or the like contains a polyvalent metal compound, the storage conditions of the pressure-sensitive adhesive sheet are poor, such as high temperature and high humidity. If the conditions are met, the adhesive properties will deteriorate with time, and problems such as terminal peeling will occur after application to the adherend. Moreover, when the base material of the pressure-sensitive adhesive sheet contains a polyvalent metal compound, the adherend contains the polyvalent metal compound even if the storage conditions are relatively good conditions such as the standard state. Even if it is good immediately after sticking, problems such as terminal peeling will gradually occur. On the other hand, when the polyvalent metal compound is not included in the base material of the pressure-sensitive adhesive sheet, the adhesive property does not deteriorate under the storage conditions of the pressure-sensitive adhesive sheet, but if the polyvalent metal compound is contained in the adherend, the use conditions However, for example, under adverse conditions such as high temperature and high humidity, the adhesive properties deteriorate over time, and problems such as terminal peeling gradually occur. On the other hand, in the pressure-sensitive adhesive sheet of the present invention, since the base polymer of the pressure-sensitive adhesive composition constituting the pressure-sensitive adhesive layer is composed of a specific monomer unit, any environment in which the pressure-sensitive adhesive layer is in contact with the polyvalent metal compound ( The terminal peeling can be sufficiently suppressed even in the environment of storage or use. Therefore, according to this invention, it can be set as the adhesive sheet with a very little change of an adhesive characteristic. Examples of the adherend include various plastic materials, metal materials, paper materials, and fiber materials.

以下、本発明を実施例により具体的に説明するが、本発明はこれらの実施例に限定されるものではない。   EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples.

(粘着シート用基材の作製)
各実施例及び比較例において、粘着剤組成物の性能を公平に判断するため基材は全て同一のものを使用した。
エチレン−酢酸ビニル共重合体[商品名:エバフレックスEV270、三井デュポンポリケミカル(株)製]50重量部、低密度ポリエチレン[商品名:スミカセンG201、住友化学(株)製]50重量部、及び多価金属化合物としての水酸化マグネシウム(平均粒子径0.8μm)の表面を飽和脂肪酸で表面処理したもの[商品名:キスマ5A、協和化学工業(株)製]100重量部を配合し、加圧ニーダーにて混練して混合物を作製した。該混合物をカレンダー圧延機により0.16mmの厚さのフイルムに成形して粘着シート用基材を作製した。
(Preparation of base material for adhesive sheet)
In each Example and Comparative Example, the same base material was used for judging the performance of the pressure-sensitive adhesive composition fairly.
50 parts by weight of ethylene-vinyl acetate copolymer [trade name: Evaflex EV270, manufactured by Mitsui DuPont Polychemical Co., Ltd.], 50 parts by weight of low density polyethylene [trade name: Sumikasen G201, manufactured by Sumitomo Chemical Co., Ltd.] The surface of magnesium hydroxide (average particle size 0.8 μm) as a polyvalent metal compound is surface-treated with saturated fatty acid [trade name: Kisuma 5A, manufactured by Kyowa Chemical Industry Co., Ltd.] 100 parts by weight. The mixture was prepared by kneading with a pressure kneader. The mixture was formed into a 0.16 mm-thick film by a calender rolling machine to prepare a base material for an adhesive sheet.

(水分散型粘着剤組成物及び粘着シートの製造)
(実施例1)
冷却管、窒素導入管、温度計及び撹拌機を備えた反応容器に、アクリル酸ブチル70重量部、アクリル酸2−エチルへキシル27.5重量部、N−イソプロピルアクリルアミド2重量部、及びアクリル酸0.5重量部からなる単量体混合物と、架橋剤としての3−メタクリロイルオキシプロピルトリメトキシシラン[商品名:KBM−503、信越化学工業(株)製]0.02部を加えた。次いで、開始剤としての2,2′−アゾビス[2−(5−メチル−2−イミダゾリン−2−イル)プロパン]ジヒドロクロライド0.05重量部と、連鎖移動剤としての1−ドデカンチオール0.05重量部を添加し、硫酸アンモニウム塩系反応性乳化剤[商品名:アクアロンHS−10、第一工業製薬(株)製]2重量部を添加した水溶液100重量部を更に加えて60℃で2時間、乳化重合を行なった。そして、反応溶液に10%アンモニウム水を添加してpH8に調整して水分散型重合体組成物を得た。
上記水分散型重合体組成物の固形分100部に対し、粘着付与剤としての重合ロジン系樹脂[商品名:E−865、荒川化学工業(株)製]10重量部(固形分)、石油系炭化水素樹脂[商品名:AP−1085、荒川化学工業(株)製]20重量部(固形分)をそれぞれ加えて水分散型粘着剤を得た。
次いで、上記で得られた基材の片面に下塗剤を施した後、水分散型粘着剤組成物を乾燥後の粘着剤層の厚さが30μmとなるように塗布、乾燥して粘着剤層を形成した。次いで、この粘着剤層に上記で得られた別の基材を更に貼り合わせて粘着シートを作製した。
(Production of water-dispersed pressure-sensitive adhesive composition and pressure-sensitive adhesive sheet)
Example 1
In a reaction vessel equipped with a cooling pipe, a nitrogen introduction pipe, a thermometer and a stirrer, 70 parts by weight of butyl acrylate, 27.5 parts by weight of 2-ethylhexyl acrylate, 2 parts by weight of N-isopropylacrylamide, and acrylic acid A monomer mixture consisting of 0.5 parts by weight and 0.02 part of 3-methacryloyloxypropyltrimethoxysilane [trade name: KBM-503, manufactured by Shin-Etsu Chemical Co., Ltd.] as a crosslinking agent were added. Then, 0.05 parts by weight of 2,2′-azobis [2- (5-methyl-2-imidazolin-2-yl) propane] dihydrochloride as an initiator and 1-dodecanethiol as a chain transfer agent were added in an amount of 0.1% by weight. 05 parts by weight were added, 100 parts by weight of an aqueous solution added with 2 parts by weight of ammonium sulfate-based reactive emulsifier [trade name: Aqualon HS-10, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.] was added at 60 ° C. for 2 hours. The emulsion polymerization was performed. And 10% ammonium water was added to the reaction solution, and it adjusted to pH8, and obtained the water dispersion type polymer composition.
10 parts by weight (solid content) of a polymerized rosin resin [trade name: E-865, manufactured by Arakawa Chemical Industries, Ltd.] as a tackifier with respect to 100 parts of the solid content of the water-dispersed polymer composition. -Based hydrocarbon resin [trade name: AP-1085, manufactured by Arakawa Chemical Industries, Ltd.] 20 parts by weight (solid content) was added to obtain a water-dispersed pressure-sensitive adhesive.
Next, after applying a primer to one side of the substrate obtained above, the water-dispersed pressure-sensitive adhesive composition was applied and dried so that the thickness of the pressure-sensitive adhesive layer after drying was 30 μm, and the pressure-sensitive adhesive layer Formed. Subsequently, another base material obtained above was further bonded to this pressure-sensitive adhesive layer to prepare a pressure-sensitive adhesive sheet.

(実施例2)
冷却管、窒素導入管、温度計及び撹拌機を備えた反応容器に、単量体混合物の組成を、アクリル酸ブチル7重量部、アクリル酸2−エチルへキシル88重量部、N−シクロへキシルマレイミド4重量部、及びメタクリル酸1重量部からなる単量体混合物と、開始剤としての2,2′−アゾビス[2−(5−メチル−2−イミダゾリン−2−イル)プロパン]ジヒドロクロライド0.05重量部と、連鎖移動剤としての1−ドデカンチオール0.05重量部とを添加し、硫酸アンモニウム塩系反応性乳化剤[商品名:アクアロンHS−10、第一工業製薬(株)製]2重量部を添加した水溶液100重量部を更に加えて60℃で2時間、乳化重合を行なった。そして、反応溶液に10%アンモニウム水を添加してpH8に調整して水分散型重合体組成物を得た。
上記水分散型重合体組成物の固形分100部に対し、エポキシ系架橋剤[商品名:TETRAD−C、三菱ガス化学(株)製]0.01重量部、粘着付与剤としての重合ロジン系樹脂[商品名:E−865、荒川化学工業(抹)製]20重量部(固形分)、及び石油系炭化水素樹脂[商品名:AP−1085、荒川化学工業(株)製]10重量部(固形分)をそれぞれ加えて水分散型粘着剤を得た。
次いで、上記で得られた基材の片面に下塗剤を施した後、該水分散型粘着剤を乾燥後の粘着剤層の厚さが30μmとなるように塗布、乾燥して粘着剤層を形成した。次いで、この粘着剤層に上記で得られた別の基材を更に貼り合わせて粘着シートを作製した。さらに、架橋反応を完了させるため、60℃で24時間エージングを行うことにより、評価サンプルを得た。
(Example 2)
In a reaction vessel equipped with a cooling pipe, a nitrogen introduction pipe, a thermometer, and a stirrer, the composition of the monomer mixture was changed to 7 parts by weight of butyl acrylate, 88 parts by weight of 2-ethylhexyl acrylate, and N-cyclohexyl. A monomer mixture comprising 4 parts by weight of maleimide and 1 part by weight of methacrylic acid and 2,2'-azobis [2- (5-methyl-2-imidazolin-2-yl) propane] dihydrochloride as an initiator 0 .05 parts by weight and 0.05 parts by weight of 1-dodecanethiol as a chain transfer agent were added, and ammonium sulfate-based reactive emulsifier [trade name: Aqualon HS-10, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.] 2 100 parts by weight of an aqueous solution added with parts by weight was further added, and emulsion polymerization was performed at 60 ° C. for 2 hours. And 10% ammonium water was added to the reaction solution, and it adjusted to pH8, and obtained the water dispersion type polymer composition.
Epoxy crosslinking agent [trade name: TETRAD-C, manufactured by Mitsubishi Gas Chemical Co., Ltd.] 0.01 parts by weight based on 100 parts of the solid content of the water-dispersed polymer composition, polymerized rosin as a tackifier 20 parts by weight of resin [trade name: E-865, manufactured by Arakawa Chemical Industries (Mori)] and 10 parts by weight of petroleum hydrocarbon resin [trade name: AP-1085, manufactured by Arakawa Chemical Industries, Ltd.] (Solid content) was added to obtain a water-dispersed pressure-sensitive adhesive.
Next, after applying a primer to one side of the substrate obtained above, the water-dispersed pressure-sensitive adhesive was applied and dried so that the thickness of the pressure-sensitive adhesive layer after drying was 30 μm, and then the pressure-sensitive adhesive layer was formed. Formed. Subsequently, another base material obtained above was further bonded to this pressure-sensitive adhesive layer to prepare a pressure-sensitive adhesive sheet. Furthermore, in order to complete the crosslinking reaction, an evaluation sample was obtained by performing aging at 60 ° C. for 24 hours.

(実施例3)
冷却管、窒素導入管、温度計及び撹拌機を備えた反応容器に、アクリル酸ブチル50重量部、アクリル酸2−エチルへキシル39.5重量部、N−シクロへキシルマレイミド10重量部、メタクリル酸1重量部からなる単量体混合物と、開始剤としての2,2′−アゾビス[2−(5−メチル−2−イミダゾリン−2−イル)プロパン]ジヒドロクロライド0.05重量部と、連鎖移動剤としての1−ドデカンチオール0.05重量部を添加し、硫酸アンモニウム塩系反応性乳化剤[商品名:アクアロンHS−10、第一工業製薬(珠)製]2重量部を添加した水溶液100重量部を更に加えて60℃で2時間、乳化重合を行なった。そして、反応溶液に10%アンモニウム水を添加してpH8に調整して水分散型重合体組成物を得た。
上記水分散型重合体組成物の固形分100部に対し、エポキシ系架橋剤[商品名:TETRAD−C、三菱ガス化学(株)製]0.03重量部、粘着付与剤としての重合ロジン系樹脂[商品名:E−865、荒川化学工業(株)製]20重量部(固形分)、及び石油系炭化水素樹脂[商品名:AP−1085、荒川化学工業(株)製]10重量部(固形分)をそれぞれ加えて水分散型粘着剤を得た。
上記で得られた基材の片面に下塗剤を施した後、該水分散型粘着剤を乾燥後の粘着剤層の厚さが30μmとなるように塗布、乾燥して粘着剤層を形成した。次いで、この粘着剤層に上記で得られた別の基材を更に貼り合わせて粘着シートを作製した。さらに、架橋反応を完了させるため、60℃で24時間エージングを行うことにより、評価サンプルを得た。
(Example 3)
In a reaction vessel equipped with a cooling pipe, a nitrogen introduction pipe, a thermometer and a stirrer, 50 parts by weight of butyl acrylate, 39.5 parts by weight of 2-ethylhexyl acrylate, 10 parts by weight of N-cyclohexylmaleimide, methacrylic acid A monomer mixture consisting of 1 part by weight of acid, 0.05 part by weight of 2,2′-azobis [2- (5-methyl-2-imidazolin-2-yl) propane] dihydrochloride as an initiator, 100 parts by weight of an aqueous solution containing 0.05 parts by weight of 1-dodecanethiol as a transfer agent and 2 parts by weight of an ammonium sulfate-based reactive emulsifier [trade name: Aqualon HS-10, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.] Further, the emulsion polymerization was carried out at 60 ° C. for 2 hours. And 10% ammonium water was added to the reaction solution, and it adjusted to pH8, and obtained the water dispersion type polymer composition.
0.03 part by weight of an epoxy-based cross-linking agent [trade name: TETRAD-C, manufactured by Mitsubishi Gas Chemical Co., Ltd.] with respect to 100 parts of the solid content of the water-dispersed polymer composition, a polymerized rosin system as a tackifier Resin [trade name: E-865, manufactured by Arakawa Chemical Industries, Ltd.] 20 parts by weight (solid content) and petroleum hydrocarbon resin [trade name: AP-1085, manufactured by Arakawa Chemical Industries, Ltd.] 10 parts by weight (Solid content) was added to obtain a water-dispersed pressure-sensitive adhesive.
After applying a primer to one side of the substrate obtained above, the water-dispersed pressure-sensitive adhesive was applied and dried so that the thickness of the pressure-sensitive adhesive layer after drying was 30 μm to form a pressure-sensitive adhesive layer. . Subsequently, another base material obtained above was further bonded to this pressure-sensitive adhesive layer to prepare a pressure-sensitive adhesive sheet. Furthermore, in order to complete the crosslinking reaction, an evaluation sample was obtained by performing aging at 60 ° C. for 24 hours.

(実施例4)
冷却管、窒素導入管、温度計および撹拌機を備えた反応容器に、アクリル酸ブチル70重量部、アクリル酸2−エチルへキシル24重量部、N−シクロへキシルマレイミド5重量部、メタクリル酸1重量部からなる単量体混合物と、開始剤としての2,2′−アゾビス[2−(5−メチル−2−イミダゾリン−2−イル)プロパン]ジヒドロクロライド0.05重量部を添加し、硫酸アンモニウム塩系反応性乳化剤[商品名:アクアロンHS−10、第一工業製薬(株)製]2重量部を添加した水溶液100重量部を更に加えて60℃で2時間、乳化重合を行なった。そして、反応溶液に10%アンモニウム水を添加してpH8に調整して水分散型重合体組成物を得た。
上記水分散型重合体組成物の固形分100部に対し、エポキシ系架橋剤[商品名:TETRAD−C、三菱ガス化学(株)製]0.01重量部、粘着付与剤としての重合ロジン系樹脂[商品名:E−865、荒川化学工業(株)製]20重量部(固形分)、及び石油系炭化水素樹脂[商品名:AP−1085、荒川化学工業(珠)製]10重量部(固形分)をそれぞれ加えて水分散型粘着剤を得た。
上記で得られた基材の片面に下塗剤を施した後、該水分散型粘着剤を乾燥後の粘着剤層の厚さが30μmとなるように塗布、乾燥して粘着剤層を形成した。次いで、この粘着剤層に上記で得られた別の基材を更に貼り合わせて粘着シートを作製した。さらに、架橋反応を完了させるため、60℃で24時間エージングを行うことにより、評価サンプルを得た。
Example 4
In a reaction vessel equipped with a cooling tube, a nitrogen introduction tube, a thermometer and a stirrer, 70 parts by weight of butyl acrylate, 24 parts by weight of 2-ethylhexyl acrylate, 5 parts by weight of N-cyclohexylmaleimide, 1 methacrylic acid A monomer mixture consisting of parts by weight and 0.05 part by weight of 2,2′-azobis [2- (5-methyl-2-imidazolin-2-yl) propane] dihydrochloride as an initiator were added, and ammonium sulfate was added. 100 parts by weight of an aqueous solution to which 2 parts by weight of a salt-based reactive emulsifier [trade name: Aqualon HS-10, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.] was added was added, and emulsion polymerization was performed at 60 ° C. for 2 hours. And 10% ammonium water was added to the reaction solution, and it adjusted to pH8, and obtained the water dispersion type polymer composition.
Epoxy crosslinking agent [trade name: TETRAD-C, manufactured by Mitsubishi Gas Chemical Co., Ltd.] 0.01 parts by weight based on 100 parts of the solid content of the water-dispersed polymer composition, polymerized rosin as a tackifier Resin [trade name: E-865, manufactured by Arakawa Chemical Industry Co., Ltd.] 20 parts by weight (solid content), and petroleum hydrocarbon resin [trade name: AP-1085, manufactured by Arakawa Chemical Industries, Ltd.] 10 parts by weight (Solid content) was added to obtain a water-dispersed pressure-sensitive adhesive.
After applying a primer to one side of the substrate obtained above, the water-dispersed pressure-sensitive adhesive was applied and dried so that the thickness of the pressure-sensitive adhesive layer after drying was 30 μm to form a pressure-sensitive adhesive layer. . Subsequently, another base material obtained above was further bonded to this pressure-sensitive adhesive layer to prepare a pressure-sensitive adhesive sheet. Furthermore, in order to complete the crosslinking reaction, an evaluation sample was obtained by performing aging at 60 ° C. for 24 hours.

(比較例1)
冷却管、窒素導入管、温度計及び撹拌機を備えた反応容器に、アクリル酸ブチル7重量部、アクリル酸2−エチルへキシル92重量部、及びメタクリル酸1重量部からなる単量体混合物と、開始剤としての2,2′−アゾビス[2−(5−メチル−2−イミダゾリン−2−イル)プロパン]ジヒドロクロライド0.05重量部を添加し、硫酸アンモニウム塩系非反応性乳化剤[商品名:エマールAD−25R、花王(株)製]2重量部を添加した水溶液100重量部を更に加えて60℃で2時間、乳化重合を行なった。そして、反応溶液に10%アンモニウム水を添加してpH8に調整して水分散型重合体組成物を得た。
上記水分散型重合体組成物の固形分100部に対し、エポキシ系架橋剤[商品名:TETRAD−C、三菱ガス化学(株)製]0.01重量部、粘着付与剤として重合ロジン系樹脂[商品名:E−865、荒川化学工業(株)製]20重量部(固形分)、及び石油系炭化水素樹脂[商品名:AP−1085、荒川化学工業(株)製]10重量部(固形分)をそれぞれ加えて水分散型粘着剤を得た。
上記で得られた基材の片面に下塗剤を施した後、該水分散型粘着剤を乾燥後の粘着剤層の厚さが30μmとなるように塗布、乾燥して粘着剤層を形成した。次いで、この粘着剤層に上記で得られた別の基材を更に貼り合わせて粘着シートを作製した。さらに、架橋反応を完了させるため、60℃で24時間エージングを行うことにより、評価サンプルを得た。
(Comparative Example 1)
A monomer mixture comprising 7 parts by weight of butyl acrylate, 92 parts by weight of 2-ethylhexyl acrylate, and 1 part by weight of methacrylic acid in a reaction vessel equipped with a cooling pipe, a nitrogen introduction pipe, a thermometer and a stirrer; , 0.05 part by weight of 2,2′-azobis [2- (5-methyl-2-imidazolin-2-yl) propane] dihydrochloride as an initiator was added, and ammonium sulfate salt non-reactive emulsifier [trade name : EMAL AD-25R, manufactured by Kao Corporation] 100 parts by weight of an aqueous solution added with 2 parts by weight was further added, and emulsion polymerization was performed at 60 ° C. for 2 hours. And 10% ammonium water was added to the reaction solution, and it adjusted to pH8, and obtained the water dispersion type polymer composition.
Epoxy crosslinking agent [trade name: TETRAD-C, manufactured by Mitsubishi Gas Chemical Co., Ltd.] 0.01 parts by weight based on 100 parts of the solid content of the water-dispersed polymer composition, polymerized rosin resin as a tackifier [Product name: E-865, manufactured by Arakawa Chemical Industries, Ltd.] 20 parts by weight (solid content) and petroleum hydrocarbon resin [Product name: AP-1085, manufactured by Arakawa Chemical Industries, Ltd.] 10 parts by weight ( Solid content) was added to obtain a water-dispersed pressure-sensitive adhesive.
After applying a primer to one side of the substrate obtained above, the water-dispersed pressure-sensitive adhesive was applied and dried so that the thickness of the pressure-sensitive adhesive layer after drying was 30 μm to form a pressure-sensitive adhesive layer. . Subsequently, another base material obtained above was further bonded to this pressure-sensitive adhesive layer to prepare a pressure-sensitive adhesive sheet. Furthermore, in order to complete the crosslinking reaction, an evaluation sample was obtained by performing aging at 60 ° C. for 24 hours.

(比較例2)
冷却管、窒素導入管、温度計及び撹拌機を備えた反応容器に、アクリル酸ブチル90重量部、N−シクロへキシルマレイミド5重量部、アクリル酸5重量部からなる単量体混合物と、架橋剤としての3−メタクリロイルオキシプロピルトリメトキシシラン[商品名:KBM−503、信越化学工業(株)製]0.01重量部を添加した。次いで、開始剤としての2,2′−アゾビス[2−(5−メチル−2−イミダゾリン−2−イル)プロパン]ジヒドロクロライド0.05重量部を添加し、硫酸アンモニウム塩系反応性乳化剤[商品名:アクアロンHS−10、第一工業製薬(株)製]2重量部を添加した水溶液100重量部を更に加えて60℃で2時間、乳化重合を行なった。そして、反応溶液に10%アンモニウム水を添加してpH8に調整して水分散型重合体組成物を得た。
上記水分散型重合体組成物の固形分100部に対し、粘着付与剤としての重合ロジン系樹脂[商品名:E−865、荒川化学工業(株)製]20重量部(固形分)、及び石油系炭化水素樹脂[商品名:AP−1085、荒川化学工業(株)製]固形分で10重量部をそれぞれ加えて水分散型粘着剤を得た。
上記で得られた基材の片面に下塗剤を施した後、該水分散型粘着剤を乾燥後の粘着剤層の厚さが30μmとなるように塗布、乾燥して粘着剤層を形成した。次いで、この粘着剤層に上記で得られた別の基材を更に貼り合わせて粘着シートを作製した。
(Comparative Example 2)
In a reaction vessel equipped with a cooling pipe, a nitrogen introduction pipe, a thermometer and a stirrer, a monomer mixture consisting of 90 parts by weight of butyl acrylate, 5 parts by weight of N-cyclohexylmaleimide and 5 parts by weight of acrylic acid, and crosslinking 0.01 part by weight of 3-methacryloyloxypropyltrimethoxysilane [trade name: KBM-503, manufactured by Shin-Etsu Chemical Co., Ltd.] as an agent was added. Subsequently, 0.05 parts by weight of 2,2′-azobis [2- (5-methyl-2-imidazolin-2-yl) propane] dihydrochloride as an initiator was added, and an ammonium sulfate salt-based reactive emulsifier [trade name] : Aqualon HS-10, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.] 100 parts by weight of an aqueous solution added with 2 parts by weight was further added, and emulsion polymerization was performed at 60 ° C. for 2 hours. And 10% ammonium water was added to the reaction solution, and it adjusted to pH8, and obtained the water dispersion type polymer composition.
20 parts by weight (solid content) of polymerized rosin resin [trade name: E-865, manufactured by Arakawa Chemical Industries, Ltd.] as a tackifier, with respect to 100 parts of solid content of the water-dispersed polymer composition, and Petroleum hydrocarbon resin [trade name: AP-1085, manufactured by Arakawa Chemical Industry Co., Ltd.] 10 parts by weight of solid content was added to obtain a water-dispersed adhesive.
After applying a primer to one side of the substrate obtained above, the water-dispersed pressure-sensitive adhesive was applied and dried so that the thickness of the pressure-sensitive adhesive layer after drying was 30 μm to form a pressure-sensitive adhesive layer. . Subsequently, another base material obtained above was further bonded to this pressure-sensitive adhesive layer to prepare a pressure-sensitive adhesive sheet.

(比較例3)
冷却管、窒素導入管、温度計及び撹拌機を備えた反応容器に、アクリル酸ブチル90重量部、N−イソプロピルアクリルアミド5重量部、アクリル酸5重量部からなる単量体混合物と、架橋剤としての3−メタクリロイルオキシプロピルトリメトキシシラン[商品名:KBM−503、信越化学工業(株)製]0.01部を添加した。次いで、開始剤としての2,2′−アゾビス[2−(5−メチル−2−イミダゾリン−2−イル)プロパン]ジヒドロクロライド0.05重量部を添加し、硫酸アンモニウム塩系反応性乳化剤[商品名:アクアロンHS−10、第一工業製薬(株)製]2重量部を添加した水溶液100重量部を更に加えて60℃で2時間、乳化重合を行なった。そして、反応溶液に10%アンモニウム水を添加してpH8に調整して水分散型重合体組成物を得た。
上記水分散型重合体組成物の固形分100部に対し、粘着付与剤としての重合ロジン系樹脂[商品名:E−865、荒川化学工業(株)製]20重量部(固形分)、及び石油系炭化水素樹脂[商品名:AP−1085、荒川化学工業(株)製]10重量部(固形分)をそれぞれ加えて水分散型粘着剤を得た。
上記で得られた基材の片面に下塗剤を施した後、該水分散型粘着剤を乾燥後の粘着剤層の厚さが30μmとなるように塗布、乾燥して粘着剤層を形成した。次いで、この粘着剤層に上記で得られた別の基材を更に貼り合わせて粘着シートを作製した。
(Comparative Example 3)
In a reaction vessel equipped with a cooling pipe, a nitrogen introduction pipe, a thermometer and a stirrer, a monomer mixture consisting of 90 parts by weight of butyl acrylate, 5 parts by weight of N-isopropylacrylamide, and 5 parts by weight of acrylic acid, and a crosslinking agent 0.01 part of 3-methacryloyloxypropyltrimethoxysilane [trade name: KBM-503, manufactured by Shin-Etsu Chemical Co., Ltd.] was added. Subsequently, 0.05 parts by weight of 2,2′-azobis [2- (5-methyl-2-imidazolin-2-yl) propane] dihydrochloride as an initiator was added, and an ammonium sulfate salt-based reactive emulsifier [trade name] : Aqualon HS-10, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.] 100 parts by weight of an aqueous solution added with 2 parts by weight was further added, and emulsion polymerization was performed at 60 ° C. for 2 hours. And 10% ammonium water was added to the reaction solution, and it adjusted to pH8, and obtained the water dispersion type polymer composition.
20 parts by weight (solid content) of polymerized rosin resin [trade name: E-865, manufactured by Arakawa Chemical Industries, Ltd.] as a tackifier, with respect to 100 parts of solid content of the water-dispersed polymer composition, and Petroleum hydrocarbon resin [trade name: AP-1085, Arakawa Chemical Industries, Ltd.] 10 parts by weight (solid content) was added to obtain a water-dispersed adhesive.
After applying a primer to one side of the substrate obtained above, the water-dispersed pressure-sensitive adhesive was applied and dried so that the thickness of the pressure-sensitive adhesive layer after drying was 30 μm to form a pressure-sensitive adhesive layer. . Subsequently, another base material obtained above was further bonded to this pressure-sensitive adhesive layer to prepare a pressure-sensitive adhesive sheet.

(比較例4)
冷却管、窒素導入管、温度計及び撹拌機を備えた反応容器に、アクリル酸ブチル70重量部、アクリル酸2−エチルへキシル29重量部、メタクリル酸1重量部からなる単量体混合物と、架橋剤としての3−メタクリロイルオキシプロピルトリメトキシシラン[商品名:KBM−503、信越化学工業(株)製]0.02部を添加した。次いで、連鎖移動剤としての1−ドデカンチオール0.05重量部、開始剤としての2,2′−アゾビス[2−(5−メチル−2−イミダゾリン−2−イル)プロパン]ジヒドロクロライド0.05重量部を添加し、硫酸アンモニウム塩系反応性乳化剤[商品名:アクアロンHS−10、第一工業製薬(株)製]2重量部を添加した水溶液100重量部を更に加えて60℃で2時間、乳化重合を行なった。そして、反応溶液に10%アンモニウム水を添加してpH8に調整して水分散型重合体組成物を得た。
上記水分散型重合体組成物の固形分100部に対し、粘着付与剤としての重合ロジン系樹脂[商品名:E−865、荒川化学工業(株)製]20重量部(固形分)、石油系炭化水素樹脂[商品名:AP−1085、荒川化学工業(株)製]10重量部(固形分)をそれぞれ加えて水分散型粘着剤を得た。
上記で得られた基材の片面に下塗剤を施した後、該水分散型粘着剤を乾燥後の粘着剤層の厚さが30μmとなるように塗布、乾燥して粘着剤層を形成した。次いで、この粘着剤層に上記で得られた別の基材を更に貼り合わせて粘着シートを作製した。
(Comparative Example 4)
In a reaction vessel equipped with a cooling pipe, a nitrogen introduction pipe, a thermometer and a stirrer, a monomer mixture consisting of 70 parts by weight of butyl acrylate, 29 parts by weight of 2-ethylhexyl acrylate, and 1 part by weight of methacrylic acid, 0.02 part of 3-methacryloyloxypropyltrimethoxysilane [trade name: KBM-503, manufactured by Shin-Etsu Chemical Co., Ltd.] as a crosslinking agent was added. Then 0.05 parts by weight of 1-dodecanethiol as chain transfer agent, 0.05 of 2,2'-azobis [2- (5-methyl-2-imidazolin-2-yl) propane] dihydrochloride as initiator 100 parts by weight of an aqueous solution added with 2 parts by weight of an ammonium sulfate salt-based reactive emulsifier [trade name: Aqualon HS-10, manufactured by Daiichi Kogyo Seiyaku Co., Ltd.] was further added at 60 ° C. for 2 hours. Emulsion polymerization was performed. And 10% ammonium water was added to the reaction solution, and it adjusted to pH8, and obtained the water dispersion type polymer composition.
20 parts by weight (solid content) of polymerized rosin resin [trade name: E-865, manufactured by Arakawa Chemical Co., Ltd.] as a tackifier with respect to 100 parts of solid content of the water-dispersed polymer composition. -Based hydrocarbon resin [trade name: AP-1085, manufactured by Arakawa Chemical Industries, Ltd.] 10 parts by weight (solid content) was added to obtain a water-dispersed adhesive.
After applying a primer to one side of the substrate obtained above, the water-dispersed pressure-sensitive adhesive was applied and dried so that the thickness of the pressure-sensitive adhesive layer after drying was 30 μm to form a pressure-sensitive adhesive layer. . Subsequently, another base material obtained above was further bonded to this pressure-sensitive adhesive layer to prepare a pressure-sensitive adhesive sheet.

[評価試験]
作製直後の各粘着シートと、温度50℃、湿度92%の環境下で4週間保存し、更に温度23℃、湿度50%の標準状態で2時間放置した後の各粘着シートについて、以下に示す方法により端末剥がれ及び接着力を評価した。評価結果を表1及び2に示す。
[Evaluation test]
Each pressure-sensitive adhesive sheet immediately after production and each pressure-sensitive adhesive sheet after being stored for 4 weeks in an environment of a temperature of 50 ° C. and a humidity of 92% and further allowed to stand for 2 hours in a standard state of a temperature of 23 ° C. and a humidity of 50% are shown below. Terminal peeling and adhesive strength were evaluated by the method. The evaluation results are shown in Tables 1 and 2.

(端末剥がれの評価)
ASTM D1000−88(電気・電子用の感圧接着テープの試験方法)の端末剥がれ性試験法に準じて測定を行った。
具体的には次のような方法で評価を行った。
作製直後又は保存後の各粘着シートから、幅6.4mm、長さ300mmの試験片を切り取る。次いで、一方の基材を剥がし、試験片の方端に380gの荷重を付けて1分間荷重をかけた状態を保つ。その後、直径3.2mm径の鋼棒に試験片が重ならないように1層巻き付ける。
次いで、1層目と同様に、試験片の方端に380gの荷重を付けて1分間荷重をかけた後、1層目の試験片の上に2層目をハーフラップ(1/2重ね合わせ)で巻き付ける。
2層目の終点部に、長さ約3mm、幅約10mm程度の紙を挟み込んで巻き付け、紙を挟んだ直後の試験片をはさみ等で切り取る。
このように準備した試料を、他のものと接触しないように垂直に立てて固定して、23℃、50%RHの雰囲気下で7日間保存した後、紙で挟んだ端部が巻き付け部位から剥がれている長さを測定する。そして、剥がれている長さ(端末剥がれ距離)が5.0mm以下のものを合格とした。
(Evaluation of device peeling)
The measurement was performed according to the terminal peelability test method of ASTM D1000-88 (Test Method for Pressure Sensitive Adhesive Tape for Electricity and Electronics).
Specifically, the evaluation was performed by the following method.
A test piece having a width of 6.4 mm and a length of 300 mm is cut out from each pressure-sensitive adhesive sheet immediately after production or after storage. Next, one of the substrates is peeled off, and a load of 380 g is applied to the end of the test piece to keep the load applied for 1 minute. Thereafter, one layer is wound around a steel bar having a diameter of 3.2 mm so that the test piece does not overlap.
Next, as with the first layer, a load of 380 g was applied to the end of the test piece and a load was applied for 1 minute, and then the second layer was half-wrapped (1/2 overlapped on the first layer test piece). )
A paper having a length of about 3 mm and a width of about 10 mm is sandwiched and wound around the end point of the second layer, and the test piece immediately after the paper is sandwiched is cut with scissors.
The sample prepared in this manner was fixed vertically so as not to come into contact with other things, and stored for 7 days under an atmosphere of 23 ° C. and 50% RH. Measure the peeled length. And what peeled off (terminal peeling distance) 5.0 mm or less was set as the pass.

(接着力の評価)
ASTM D1000−88(電気・電子用の感圧接着テープの試験方法)の接着力試験(A法)に準じて測定を行った。
具体的には次のような方法で評価を行った。
作製直後又は保存後の各粘着シートから、幅19mm、長さ150mmの試験片に切り出し、評価用サンプルを準備する。
次いで、最後に貼り合せた基材の裏側に、幅50mm、長さ150mm程度の鋼板を両面テープで貼り合わせる。
次いで、このサンプルの粘着剤層を基材から一旦剥がし、再度空気の混入がないように貼り付けた後に、重さ2kgのローラにて貼り合わせた箇所を1往復転がし、圧着させる。
次いで、20分間放置した後、粘着剤層と基材とが反対方向に引っ張られるように、引張試験機[AG−20KNG、(株)島津製作所製]のチャックに挟み、23℃、50%RHの雰囲気下、300m/minの速度で引っ張ることにより、180°方向の自背面接着力を測定する。そして、自背面接着力が2.0N/19mm以上である場合、接着性が良好であると判断する。
(Adhesive strength evaluation)
The measurement was performed according to the adhesion test (Method A) of ASTM D1000-88 (Testing Method for Pressure Sensitive Adhesive Tape for Electricity and Electronics).
Specifically, the evaluation was performed by the following method.
From each pressure-sensitive adhesive sheet immediately after production or after storage, a test piece having a width of 19 mm and a length of 150 mm is cut out to prepare a sample for evaluation.
Next, a steel sheet having a width of about 50 mm and a length of about 150 mm is bonded to the back side of the last bonded substrate with a double-sided tape.
Next, the pressure-sensitive adhesive layer of this sample is once peeled off from the base material and pasted again so as not to be mixed with air, and then the part pasted by a roller having a weight of 2 kg is rolled back and forth once to be pressure-bonded.
Next, after being left for 20 minutes, the adhesive layer and the substrate are sandwiched between chucks of a tensile tester [AG-20KNG, manufactured by Shimadzu Corporation] so that the adhesive layer and the substrate are pulled in the opposite direction, and 23 ° C., 50% RH. The self-back surface adhesive force in the direction of 180 ° is measured by pulling at a speed of 300 m / min in the atmosphere. And when self-back surface adhesive force is 2.0 N / 19mm or more, it judges that adhesiveness is favorable.

Figure 0005220990
Figure 0005220990

Figure 0005220990
Figure 0005220990

実施例1〜4については、単量体単位として(メタ)アクリル酸エステル、窒素含有単量体及び酸性官能基含有単量体を含み、かつ酸性官能基含有単量体を所定量含む共重合体を粘着剤組成物に含有せしめることで、50℃、湿度92%の条件で4週間保存した後でも端末剥がれの発生もほとんどなく、また接着力の低下や、異常な上昇も見られなかった。
比較例1及び4では、窒素含有単量体を含まないため、保存後に端末剥がれを生じた。また、比較例2及び3では、窒素含有単量体と酸性官能基含有単量体とを併用しているが、酸性官能基含有単量体の含有量が多いため、保存後に端末剥がれを生じ、接着力も低下した。
For Examples 1 to 4, a copolymer containing a (meth) acrylic acid ester, a nitrogen-containing monomer and an acidic functional group-containing monomer as a monomer unit, and a predetermined amount of the acidic functional group-containing monomer By including the coalescence in the pressure-sensitive adhesive composition, there was almost no peeling of the terminal even after storage for 4 weeks at 50 ° C. and 92% humidity, and no decrease in adhesive strength or abnormal increase was observed. .
In Comparative Examples 1 and 4, since the nitrogen-containing monomer was not included, terminal peeling occurred after storage. Further, in Comparative Examples 2 and 3, a nitrogen-containing monomer and an acidic functional group-containing monomer are used in combination, but since the content of the acidic functional group-containing monomer is large, terminal peeling occurs after storage. The adhesive strength also decreased.

本発明の粘着シートの一実施形態を示す断面図である。It is sectional drawing which shows one Embodiment of the adhesive sheet of this invention.

符号の説明Explanation of symbols

1…基材、3…粘着剤層、10…粘着シート
DESCRIPTION OF SYMBOLS 1 ... Base material, 3 ... Adhesive layer, 10 ... Adhesive sheet

Claims (2)

(メタ)アクリル酸エステルを主成分とし、これと共重合可能なアクリルアミド化合物又はマレイミド化合物並びに酸性官能基含有単量体を少なくとも含む単量体混合物を、単量体混合物100重量部に対して0.1〜5重量部の反応性乳化剤を用いてエマルション共重合することにより得られる共重合体を含有し、かつ単量体混合物100重量部に占める酸性官能基含有単量体の含有量が2.0重量部以下であり、
単量体混合物100重量部に占めるアクリルアミド化合物又はマレイミド化合物の含有量が0.5〜15重量部であり、
多価金属化合物を含む被着体への貼付であることを特徴とする、水分散型粘着剤組成物。
A monomer mixture containing a (meth) acrylic acid ester as a main component and at least an acrylamide compound or a maleimide compound copolymerizable therewith and an acidic functional group-containing monomer is added to 100 parts by weight of the monomer mixture. 0.1 to 5 parts by weight of a reactive emulsifier is used to contain a copolymer obtained by emulsion copolymerization, and the content of acidic functional group-containing monomers in 100 parts by weight of the monomer mixture is 2 0.0 parts by weight or less ,
The content of the acrylamide compound or maleimide compound in 100 parts by weight of the monomer mixture is 0.5 to 15 parts by weight,
A water-dispersed pressure-sensitive adhesive composition, which is used for sticking to an adherend containing a polyvalent metal compound.
多価金属化合物が金属水酸化物であることを特徴とする、請求項1記載の粘着剤組成物。   The pressure-sensitive adhesive composition according to claim 1, wherein the polyvalent metal compound is a metal hydroxide.
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