JP5185690B2 - Water dispersion type pressure sensitive adhesive composition - Google Patents

Water dispersion type pressure sensitive adhesive composition Download PDF

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JP5185690B2
JP5185690B2 JP2008129622A JP2008129622A JP5185690B2 JP 5185690 B2 JP5185690 B2 JP 5185690B2 JP 2008129622 A JP2008129622 A JP 2008129622A JP 2008129622 A JP2008129622 A JP 2008129622A JP 5185690 B2 JP5185690 B2 JP 5185690B2
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栄 田中
昭弘 阪本
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Ipposha Oil Industries Co Ltd
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本発明は、水分散型感圧接着剤組成物及び当該接着剤組成物層をフォームシート基材の少なくとも一方の面に有する感圧接着剤塗工物に関する。   The present invention relates to a water-dispersed pressure-sensitive adhesive composition and a pressure-sensitive adhesive coated product having the adhesive composition layer on at least one surface of a foam sheet substrate.

従来、感圧接着シート類には、主として、溶剤型のアクリル系ポリマーを主成分とした感圧接着剤が用いられてきた。しかし、溶剤型感圧接着剤は、有機溶媒中で合成されるため、塗工時に溶剤が揮発するので環境的に問題があり、水分散型の感圧接着剤への転換が図られている。また、アクリル系ポリマーを主成分とした感圧接着剤を塗工した感圧シート類は、ステンレス、ポリエチレンテレフタレート等の極性被着体への接着力は高いが、ポリエチレン、ポリプロピレン等の非極性被着体への接着力が低く、又これらの被着体への接着後の末端剥がれ防止性(曲面等に貼り付けた場合の末端部からの浮きや剥がれに対する耐久性)等が劣るという欠点を改良するために、感圧接着剤組成物中に、ロジン系樹脂、テルペン系樹脂、石油系樹脂などの粘着付与樹脂を配合することが行われている。   Conventionally, pressure-sensitive adhesives mainly composed of a solvent-type acrylic polymer have been used for pressure-sensitive adhesive sheets. However, since the solvent-type pressure-sensitive adhesive is synthesized in an organic solvent, there is an environmental problem because the solvent volatilizes during coating, and conversion to a water-dispersed pressure-sensitive adhesive is being attempted. . In addition, pressure-sensitive sheets coated with a pressure-sensitive adhesive mainly composed of an acrylic polymer have high adhesion to polar adherends such as stainless steel and polyethylene terephthalate, but nonpolar covers such as polyethylene and polypropylene. Adhesive strength to the adherend is low, and the terminal peeling prevention after adhering to these adherends (durability from lifting or peeling from the end when attached to a curved surface, etc.) is a disadvantage. In order to improve, tackifying resin, such as a rosin resin, a terpene resin, and a petroleum resin, is blended in the pressure-sensitive adhesive composition.

ところが、前記粘着付与樹脂は極めて水に分散しにくいため、水に均一に分散させるには多量の乳化剤を必要とする。この多量の乳化剤の影響により、従来のアクリル系ポリマーエマルションを主成分とする水分散型感圧接着剤組成物を塗工した感圧シート類は、湿度の高い場所や水滴のかかる場所においては、感圧接着剤自身が吸水したり、乳化剤がブリードアウトして、被着体に対する接着力が低下するという問題があるため、耐水性の必要な用途には適さなかった。   However, since the tackifying resin is extremely difficult to disperse in water, a large amount of emulsifier is required to disperse uniformly in water. Under the influence of this large amount of emulsifier, pressure-sensitive sheets coated with a water-dispersed pressure-sensitive adhesive composition mainly composed of a conventional acrylic polymer emulsion are used in places with high humidity or where water droplets are applied. Since the pressure-sensitive adhesive itself absorbs water or the emulsifier bleeds out, there is a problem that the adhesive force to the adherend is reduced, so that it is not suitable for applications requiring water resistance.

こうした状況下、粘着付与樹脂を水に分散させる際に必要な乳化剤を減らすための方法として、表面に極性基を有するシードポリマーに粘着付与樹脂とアクリル系モノマーを取り込ませて重合する方法が示されている(特許文献1参照)。しかし、この方法において、アクリル系モノマー重合時に使用できる粘着付与樹脂は、結果的にはアクリル系モノマーの重合阻害を起こさないものに限定されるため、これを含む感圧接着剤を塗工した感圧シート類を非極性被着体に貼り付けた場合の耐水性を高めることができる適切な粘着付与剤を選択できない。   Under these circumstances, as a method for reducing the emulsifier necessary for dispersing the tackifying resin in water, a method is shown in which a seed polymer having a polar group on the surface incorporates the tackifying resin and an acrylic monomer for polymerization. (See Patent Document 1). However, in this method, the tackifier resin that can be used at the time of acrylic monomer polymerization is limited to those that do not cause polymerization inhibition of the acrylic monomer as a result. It is not possible to select an appropriate tackifier that can improve the water resistance when the pressure sheets are attached to a nonpolar adherend.

また、(メタ)アクリル酸アルキル又は脂環式エステルを主単量体成分とし、特定のガラス転移温度及び重量平均分子量を有するアクリル系ポリマーからなるシードエマルションに、ガラス転移温度及び重量平均分子量が特定の範囲となるように単量体混合物を加えて重合させて得られる水分散型感圧接着剤組成物が提案されている(特許文献2参照)。しかし、この感圧接着剤組成物を塗工した感圧シート類は、非極性被着体への接着力は上がるものの、湿度の高い場所や水滴のかかる場所での非極性被着体に貼り付けた場合の耐水性は十分ではなかった。
特開平10−195407号公報 特開2003−105298号公報
In addition, the glass transition temperature and the weight average molecular weight are specified in the seed emulsion made of an acrylic polymer having a specific glass transition temperature and a weight average molecular weight, the main monomer component of which is an alkyl (meth) acrylate or an alicyclic ester. There has been proposed a water-dispersed pressure-sensitive adhesive composition obtained by adding a monomer mixture and polymerizing it so as to be in the above range (see Patent Document 2). However, pressure-sensitive sheets coated with this pressure-sensitive adhesive composition can be applied to non-polar adherends in places with high humidity or where water droplets are applied, although the adhesion to non-polar adherends increases. The water resistance when attached was not sufficient.
JP-A-10-195407 JP 2003-105298 A

本発明の目的は、環境や安全衛生などに問題のない水分散型の感圧接着剤組成物であって、これをフォームシート基材に塗工した塗工物を非極性被着体に貼り付けた場合の耐水性に優れた水分散型感圧接着剤組成物を提供することにある。   An object of the present invention is a water-dispersed pressure-sensitive adhesive composition that is free from problems in the environment and safety and health, and a coated product coated on a foam sheet substrate is attached to a nonpolar adherend. An object of the present invention is to provide a water-dispersed pressure-sensitive adhesive composition having excellent water resistance when attached.

本発明者は、上記課題を達成すべく鋭意検討した。その結果、特定のモノマー混合物を、特定の反応性界面活性剤の特定量存在下で乳化重合させることにより得られるアクリル系ポリマーエマルションと、特定の粘着付与樹脂エマルションとを、特定割合で含有する水分散型感圧接着剤組成物によれば、上記課題を達成し得ることを見出し、これに基づいて本発明を完成するに至った。   The inventor has intensively studied to achieve the above-described problems. As a result, water containing an acrylic polymer emulsion obtained by emulsion polymerization of a specific monomer mixture in the presence of a specific amount of a specific reactive surfactant and a specific tackifying resin emulsion in a specific ratio. According to the dispersion-type pressure-sensitive adhesive composition, it has been found that the above problems can be achieved, and the present invention has been completed based on this.

本発明は、以下の水分散型感圧接着剤組成物及び感圧接着剤塗工物を提供するものである。   The present invention provides the following water-dispersed pressure-sensitive adhesive composition and pressure-sensitive adhesive coated product.

1.(A)炭素数2〜14のアルキル基を有するアクリル酸アルキルエステル(a)70〜95.9重量%、重合性不飽和カルボン酸(b)0.1〜10重量%、及びホモポリマーのガラス転移温度が20〜110℃のメタクリル酸アルキルエステル(c)4〜20重量%を含有するモノマー混合物100重量部を、上記(a)〜(c)と共重合可能なエチレン性不飽和基を有する反応性界面活性剤(d)0.1〜10重量部の存在下に、水媒体中で乳化重合して得られるアクリル系ポリマーエマルション、並びに
(B)乳化剤の存在下に粘着付与樹脂を乳化して得られる粘着付与樹脂エマルションを、
前記アクリル系ポリマーエマルション(A)中のポリマー成分100重量部に対して、粘着付与樹脂エマルション(B)中の粘着付与樹脂成分を5〜20重量部の割合で含むことを特徴とする水分散型感圧接着剤組成物。
1. (A) Acrylic acid alkyl ester having an alkyl group having 2 to 14 carbon atoms (a) 70 to 95.9% by weight, polymerizable unsaturated carboxylic acid (b) 0.1 to 10% by weight, and homopolymer glass 100 parts by weight of a monomer mixture containing 4 to 20% by weight of a methacrylic acid alkyl ester (c) having a transition temperature of 20 to 110 ° C. has an ethylenically unsaturated group copolymerizable with the above (a) to (c). Reactive surfactant (d) An acrylic polymer emulsion obtained by emulsion polymerization in an aqueous medium in the presence of 0.1 to 10 parts by weight, and (B) a tackifier resin in the presence of an emulsifier. The tackifying resin emulsion obtained by
A water-dispersed type comprising 5 to 20 parts by weight of the tackifying resin component in the tackifying resin emulsion (B) with respect to 100 parts by weight of the polymer component in the acrylic polymer emulsion (A) Pressure sensitive adhesive composition.

2.上記ホモポリマーのガラス転移温度が20〜110℃のメタクリル酸アルキルエステル(c)が、メタクリル酸エチル、メタクリル酸n−ブチル、メタクリル酸iso−ブチル、メタクリル酸tert−ブチル、及びメタクリル酸シクロヘキシルの少なくとも一種である上記項1記載の水分散型感圧接着剤組成物。   2. The alkyl methacrylate (c) having a glass transition temperature of 20 to 110 ° C. of the homopolymer is at least one of ethyl methacrylate, n-butyl methacrylate, iso-butyl methacrylate, tert-butyl methacrylate, and cyclohexyl methacrylate. The water-dispersed pressure-sensitive adhesive composition according to item 1, which is a kind.

3.フォームシート基材の少なくとも一方の面に、上記項1又は2記載の水分散型感圧接着剤組成物を、感圧接着剤層として有する感圧接着剤塗工物。   3. A pressure-sensitive adhesive coated product having the water-dispersed pressure-sensitive adhesive composition according to Item 1 or 2 as a pressure-sensitive adhesive layer on at least one surface of a foam sheet substrate.

水分散型感圧接着剤組成物
本発明の水分散型感圧接着剤組成物は、上記アクリル系ポリマーエマルション(A)と、上記粘着付与樹脂エマルション(B)とを、特定割合で含有する水分散型感圧接着剤組成物である。
Water-dispersed pressure-sensitive adhesive composition The water-dispersed pressure-sensitive adhesive composition of the present invention is water containing the acrylic polymer emulsion (A) and the tackifying resin emulsion (B) in a specific ratio. A dispersion-type pressure-sensitive adhesive composition.

アクリル系ポリマーエマルション(A)
アクリル系ポリマーエマルション(A)は、炭素数2〜14のアルキル基を有するアクリル酸アルキルエステル(a)70〜95.9重量%、重合性不飽和カルボン酸(b)0.1〜10重量%、及びホモポリマーのガラス転移温度が20〜110℃のメタクリル酸アルキルエステル(c)4〜20重量%を含有するモノマー混合物100重量部を、上記(a)〜(c)と共重合可能なエチレン性不飽和基を有する反応性界面活性剤(d)0.1〜10重量部の存在下に、水媒体中で乳化重合して得られるものである。
Acrylic polymer emulsion (A)
The acrylic polymer emulsion (A) is an acrylic acid alkyl ester (a) having an alkyl group having 2 to 14 carbon atoms (a) of 70 to 95.9% by weight, and a polymerizable unsaturated carboxylic acid (b) of 0.1 to 10% by weight. And 100 parts by weight of a monomer mixture containing 4 to 20% by weight of a methacrylic acid alkyl ester (c) having a glass transition temperature of 20 to 110 ° C. of the homopolymer and ethylene copolymerizable with the above (a) to (c) It is obtained by emulsion polymerization in an aqueous medium in the presence of 0.1 to 10 parts by weight of a reactive surfactant (d) having a polymerizable unsaturated group.

アルキル基の炭素数が2〜14のアクリル酸アルキルエステル(a)としては、例えば、アクリル酸エチル、アクリル酸n−プロピル、アクリル酸iso−プロピル、アクリル酸n−ブチル、アクリル酸iso−ブチル、アクリル酸n−ヘキシル、アクリル酸n−オクチル、アクリル酸2−エチルヘキシル、アクリル酸n−デシル、アクリル酸n−ドデシル等の炭素数2〜14個の直鎖又は分岐脂肪族アルコールのアクリル酸エステルを挙げることができる。これらのうち、炭素数4〜12個の直鎖又は分岐脂肪族アルコールのアクリル酸エステルを用いるのが好ましい。これらのアクリル酸アルキルエステル(a)は、1種単独で用いても、2種以上を併用してもよい。   Examples of the alkyl acrylate ester having 2 to 14 carbon atoms in the alkyl group (a) include, for example, ethyl acrylate, n-propyl acrylate, iso-propyl acrylate, n-butyl acrylate, iso-butyl acrylate, Acrylic esters of linear or branched aliphatic alcohols having 2 to 14 carbon atoms such as n-hexyl acrylate, n-octyl acrylate, 2-ethylhexyl acrylate, n-decyl acrylate, n-dodecyl acrylate, etc. Can be mentioned. Among these, it is preferable to use an acrylic acid ester of a linear or branched aliphatic alcohol having 4 to 12 carbon atoms. These alkyl acrylates (a) may be used alone or in combination of two or more.

重合性不飽和カルボン酸(b)としては、分子中に少なくとも1つのカルボキシル基を持つ重合性の単量体であれば差し支えない。例えば、アクリル酸、メタクリル酸、無水マレイン酸、マレイン酸、マレイン酸モノエステル、イタコン酸、クロトン酸などを挙げることができる。これらの重合性不飽和カルボン酸(b)は、1種単独で用いても、2種以上を併用してもよい。   The polymerizable unsaturated carboxylic acid (b) may be any polymerizable monomer having at least one carboxyl group in the molecule. For example, acrylic acid, methacrylic acid, maleic anhydride, maleic acid, maleic acid monoester, itaconic acid, crotonic acid and the like can be mentioned. These polymerizable unsaturated carboxylic acids (b) may be used alone or in combination of two or more.

ホモポリマーのガラス転移温度が20〜110℃のメタクリル酸アルキルエステル(c)としては、例えば、メタクリル酸エチル、メタクリル酸n−ブチル、メタクリル酸iso−ブチル、メタクリル酸tert−ブチル、メタクリル酸シクロヘキシルなどを挙げることができる。これらのメタクリル酸アルキルエステル(c)は、1種単独で用いても、2種以上を併用してもよい。   Examples of the methacrylic acid alkyl ester (c) having a glass transition temperature of 20 to 110 ° C. of the homopolymer include, for example, ethyl methacrylate, n-butyl methacrylate, iso-butyl methacrylate, tert-butyl methacrylate, cyclohexyl methacrylate and the like. Can be mentioned. These methacrylic acid alkyl esters (c) may be used alone or in combination of two or more.

上記(a)〜(c)を含有するモノマー混合物における各モノマーの割合は、炭素数2〜14のアルキル基を有するアクリル酸アルキルエステル(a)が70〜95.9重量%程度、重合性不飽和カルボン酸(b)が0.1〜10重量%程度、及びホモポリマーのガラス転移温度が20〜110℃のメタクリル酸アルキルエステル(c)が4〜20重量%程度である。   The proportion of each monomer in the monomer mixture containing the above (a) to (c) is such that the acrylic acid alkyl ester (a) having an alkyl group having 2 to 14 carbon atoms is about 70 to 95.9% by weight, is not polymerizable. The saturated carboxylic acid (b) is about 0.1 to 10% by weight, and the homopolymer methacrylic acid alkyl ester (c) having a glass transition temperature of 20 to 110 ° C. is about 4 to 20% by weight.

重合性不飽和カルボン酸(b)の混合割合が、0.1重量%未満ではアクリル系ポリマーエマルション(A)の安定性が不十分となり、一方10重量%を超えると均一に共重合することが困難になり、結果的にアクリル系ポリマーエマルション(A)の安定性が不十分となるので、いずれも好ましくない。   If the mixing ratio of the polymerizable unsaturated carboxylic acid (b) is less than 0.1% by weight, the stability of the acrylic polymer emulsion (A) becomes insufficient, while if it exceeds 10% by weight, it can be uniformly copolymerized. It becomes difficult, and as a result, the stability of the acrylic polymer emulsion (A) becomes insufficient, so that neither is preferable.

また、ホモポリマーのガラス転移温度が20〜110℃のメタクリル酸アルキルエステル(c)の混合割合が4重量%未満では非極性被着体に対する接着性が不十分となり、耐水性が低下し、一方20重量%を超えると感圧接着剤層が硬くなり、非極性被着体に対する密着性が不十分となり、耐水性が低下するので、いずれも好ましくない。   On the other hand, when the mixing ratio of the methacrylic acid alkyl ester (c) having a glass transition temperature of 20 to 110 ° C. of the homopolymer is less than 4% by weight, the adhesion to the nonpolar adherend is insufficient, and the water resistance is lowered. If it exceeds 20% by weight, the pressure-sensitive adhesive layer becomes hard, the adhesion to a nonpolar adherend becomes insufficient, and the water resistance is lowered.

上記(a)〜(c)と共重合可能なエチレン性不飽和基を有する反応性界面活性剤(d)としては、下記一般式(1)〜(4)で表される化合物を例示することができる。   Examples of the reactive surfactant (d) having an ethylenically unsaturated group copolymerizable with the above (a) to (c) include compounds represented by the following general formulas (1) to (4). Can do.

Figure 0005185690
Figure 0005185690

Figure 0005185690
Figure 0005185690

Figure 0005185690
Figure 0005185690

Figure 0005185690
Figure 0005185690

一般式(1)〜(4)で表される化合物としては、市販品を使用することができる。市販品の具体例としては、「ラテムルS−180」(商品名、花王(株)製、有効成分:一般式(1)において、R=炭素数18のアルキル基、M=Naの化合物)、「ラテムルS−180A」(商品名、花王(株)製、有効成分:一般式(1)において、R=炭素数18のアルキル基、M=NHの化合物)、「アクアロンHS−10」(商品名、第一工業製薬(株)製、有効成分:一般式(2)の化合物)、「エレミノールJS−2」(商品名、三洋化成工業(株)製、有効成分:一般式(3)において、R=炭素数12のアルキル基の化合物)、「ラテムルPD−104」(商品名、花王(株)製、有効成分:一般式(4)の化合物)等を挙げることができる。 As the compounds represented by the general formulas (1) to (4), commercially available products can be used. Specific examples of commercially available products include “Latemul S-180” (trade name, manufactured by Kao Corporation, active ingredient: in general formula (1), R = an alkyl group having 18 carbon atoms, M = Na compound), “Latemul S-180A” (trade name, manufactured by Kao Corporation, active ingredient: in general formula (1), R = an alkyl group having 18 carbon atoms and M = NH 4 compound), “Aqualon HS-10” ( Trade name, manufactured by Daiichi Kogyo Seiyaku Co., Ltd., active ingredient: compound of general formula (2)), “Eleminol JS-2” (trade name, manufactured by Sanyo Chemical Industries, Ltd., active ingredient: general formula (3) And Ratemulu PD-104 (trade name, manufactured by Kao Corporation, active ingredient: compound of general formula (4)), and the like.

上記(a)〜(c)と共重合可能なエチレン性不飽和基を有する反応性界面活性剤(d)の使用量は、炭素数2〜14のアルキル基を有するアクリル酸アルキルエステル(a)70〜95.9重量%、重合性不飽和カルボン酸(b)0.1〜10重量%、及びホモポリマーのガラス転移温度が20〜110℃のメタクリル酸アルキルエステル(c)4〜20重量%を含有するモノマー混合物100重量部に対して、0.1〜10重量部程度である。上記反応性界面活性剤の使用量が、0.1重量部未満ではアクリル系ポリマーエマルション(A)の安定性が低下し、一方10重量部を超えると耐水性が低下するので、いずれも好ましくない。   The amount of the reactive surfactant (d) having an ethylenically unsaturated group copolymerizable with the above (a) to (c) is an alkyl acrylate ester (a) having an alkyl group having 2 to 14 carbon atoms. 70-95.9% by weight, polymerizable unsaturated carboxylic acid (b) 0.1-10% by weight, and homopolymer glass transition temperature 20-110 ° C. methacrylic acid alkyl ester (c) 4-20% by weight Is about 0.1 to 10 parts by weight with respect to 100 parts by weight of the monomer mixture. If the amount of the reactive surfactant used is less than 0.1 parts by weight, the stability of the acrylic polymer emulsion (A) is lowered. On the other hand, if it exceeds 10 parts by weight, the water resistance is lowered. .

上記反応性界面活性剤(d)は、上記(a)〜(c)と共重合可能なエチレン性不飽和基を有するので、上記(a)〜(c)と共に共重合するという反応性を有し、得られる共重合体中に組み込まれることになる。尚、上記反応性界面活性剤(d)以外に、必要に応じて、共重合性の無い乳化剤を併用することもできる。   Since the reactive surfactant (d) has an ethylenically unsaturated group copolymerizable with the above (a) to (c), it has a reactivity of copolymerizing with the above (a) to (c). Then, it will be incorporated into the resulting copolymer. In addition to the reactive surfactant (d), if necessary, an emulsifier having no copolymerization can be used in combination.

アクリル系ポリマーエマルション(A)は、炭素数2〜14のアルキル基を有するアクリル酸アルキルエステル(a)、重合性不飽和カルボン酸(b)、及びホモポリマーのガラス転移温度が20〜110℃のメタクリル酸アルキルエステル(c)をそれぞれ特定量含有するモノマー混合物100重量部を、上記(a)〜(c)と共重合可能なエチレン性不飽和基を含有する反応性界面活性剤(d)0.1〜10重量部の存在下に、水媒体中で乳化重合することにより、好適に調製することができる。   The acrylic polymer emulsion (A) has a glass transition temperature of 20 to 110 ° C. of an acrylic acid alkyl ester (a) having a C 2-14 alkyl group, a polymerizable unsaturated carboxylic acid (b), and a homopolymer. Reactive surfactant (d) 0 containing 100 parts by weight of a monomer mixture containing a specific amount of each of the alkyl methacrylate (c) and an ethylenically unsaturated group copolymerizable with the above (a) to (c) It can be suitably prepared by emulsion polymerization in an aqueous medium in the presence of 1 to 10 parts by weight.

アクリル系ポリマーエマルション(A)の乳化重合においては、上記乳化剤に加えて、重合開始剤、緩衝剤、連鎖移動剤、その他の添加剤を用いることができる。   In the emulsion polymerization of the acrylic polymer emulsion (A), in addition to the emulsifier, a polymerization initiator, a buffering agent, a chain transfer agent, and other additives can be used.

重合開始剤としては、例えば、過硫酸カリウム、過硫酸アンモニウム等の無機系開始剤;tert−ブチルベンゾエート、ジラウリルパーオキサイド、過酸化ベンゾイル、tert−ブチルハイドロパーオキサイド等の有機系開始剤が挙げられる。また、エルソルビタン酸ナトリウム等の還元剤を併用して、レドックス型で使用してもよい。   Examples of the polymerization initiator include inorganic initiators such as potassium persulfate and ammonium persulfate; organic initiators such as tert-butyl benzoate, dilauryl peroxide, benzoyl peroxide, and tert-butyl hydroperoxide. . Moreover, you may use it by a redox type | mold, using reducing agents, such as sodium sorbitanate, together.

緩衝剤としては、例えば、酢酸ナトリウム、クエン酸ナトリウム、重炭酸ナトリウムなどが使用できる。   As the buffering agent, for example, sodium acetate, sodium citrate, sodium bicarbonate and the like can be used.

また、連鎖移動剤としては、例えば、ステアリルメルカプタン、tert−ドデシルメルカプタン、n−ドデシルメルカプタン等のメルカプタン類を使用できる。   As the chain transfer agent, for example, mercaptans such as stearyl mercaptan, tert-dodecyl mercaptan, and n-dodecyl mercaptan can be used.

粘着付与樹脂エマルション(B)
粘着付与樹脂エマルション(B)は、乳化剤の存在下に粘着付与樹脂を乳化することによって、得られる水性エマルションである。
Tackifying resin emulsion (B)
The tackifying resin emulsion (B) is an aqueous emulsion obtained by emulsifying the tackifying resin in the presence of an emulsifier.

乳化される粘着付与樹脂としては、例えば、ロジンエステル、重合ロジンエステル、キシレン樹脂、テルペンフェノール樹脂、石油樹脂、クマロンインデン樹脂、テルペン樹脂、スチレン樹脂、エチレン/酢酸ビニル樹脂等を挙げることができる。   Examples of the tackifying resin to be emulsified include rosin ester, polymerized rosin ester, xylene resin, terpene phenol resin, petroleum resin, coumarone indene resin, terpene resin, styrene resin, and ethylene / vinyl acetate resin. .

粘着付与樹脂としては、市販品を使用することができる。市販品の具体例としては、「スーパーエステルA−75」(商品名、荒川化学工業(株)製、粘着付与樹脂:ロジンエステル)、「スーパーエステルA−100」(商品名、荒川化学工業(株)製、粘着付与樹脂:ロジンエステル)、「スーパーエステルA−125」(商品名、荒川化学工業(株)製、粘着付与樹脂:ロジンエステル)、「ペンセルD−125」(商品名、荒川化学工業(株)製、粘着付与樹脂:重合ロジンエステル)、「ペンセルD−135」(商品名、荒川化学工業(株)製、粘着付与樹脂:重合ロジンエステル)、「ペンセルD−160」(商品名、荒川化学工業(株)製、粘着付与樹脂:重合ロジンエステル)、「リカタックPCJ」(商品名、理化ファインテック(株)製、粘着付与樹脂:重合ロジンエステル)、「ニカノールHP−100」(商品名、三菱瓦斯化学(株)製、粘着付与樹脂:キシレン樹脂)、「ニカノールHP−150」(商品名、三菱瓦斯化学(株)製、粘着付与樹脂:キシレン樹脂)、「ニカノールHP−80」(商品名、三菱瓦斯化学(株)製、粘着付与樹脂:キシレン樹脂)、「YSポリスターT−115」(商品名、ヤスハラケミカル(株)製、粘着付与樹脂:テルペンフェノール樹脂)、「マイテックG125」(商品名、ヤスハラケミカル(株)製、粘着付与樹脂:テルペンフェノール樹脂)、「FTR−6120」(商品名、三井化学(株)製、粘着付与樹脂:石油樹脂)、「FTR−6100」(商品名、三井化学(株)製、粘着付与樹脂:石油樹脂)等を挙げることができる。   A commercially available product can be used as the tackifier resin. Specific examples of commercially available products include “Super Ester A-75” (trade name, manufactured by Arakawa Chemical Industries, Inc., tackifier resin: rosin ester), “Super Ester A-100” (trade name, Arakawa Chemical Industries ( Co., Ltd., tackifier resin: rosin ester), “Super Ester A-125” (trade name, manufactured by Arakawa Chemical Industries, Ltd., tackifier resin: rosin ester), “Pencel D-125” (trade name, Arakawa) Chemical Industry Co., Ltd., tackifying resin: polymerized rosin ester), “Pencel D-135” (trade name, manufactured by Arakawa Chemical Industries, Ltd., tackifying resin: polymerized rosin ester), “Pencel D-160” ( Trade name, manufactured by Arakawa Chemical Industry Co., Ltd., tackifying resin: polymerized rosin ester), “Rekatak PCJ” (trade name, manufactured by Rika Finetech Co., Ltd., tackifying resin: polymerized rosin ester) "Nikanol HP-100" (trade name, manufactured by Mitsubishi Gas Chemical Co., Ltd., tackifying resin: xylene resin), "Nikanol HP-150" (trade name, manufactured by Mitsubishi Gas Chemical Company, Ltd., tackifying resin: xylene resin) ), “Nikanol HP-80” (trade name, manufactured by Mitsubishi Gas Chemical Co., Inc., tackifier resin: xylene resin), “YS Polystar T-115” (trade name, manufactured by Yashara Chemical Co., Ltd., tackifier resin: terpene) Phenolic resin), "Mytec G125" (trade name, manufactured by Yashara Chemical Co., Ltd., tackifier resin: terpene phenol resin), "FTR-6120" (trade name, manufactured by Mitsui Chemicals, Inc., tackifier resin: petroleum resin) ), “FTR-6100” (trade name, manufactured by Mitsui Chemicals, Inc., tackifying resin: petroleum resin), and the like.

乳化剤としては、例えば、α―オレフィンスルホン化物、アルキルサルフェート、アルキルフェニルサルフェート、ポリオキシエチレンアルキルフェニルエーテルサルフェート、ポリオキシエチレンアラルキルフェニルエーテルのスルホコハク酸のハーフエステル塩、ロジン石鹸などのアニオン系乳化剤;ポリオキシエチレンアルキルフェニルエーテルなどのノニオン系乳化剤などを挙げることができる。これらの乳化剤は単独で用いてもよく2種以上を併用してもよい。乳化剤の使用量は、特に限定されないが、粘着付与樹脂100重量部に対して、固形分換算で、1〜10重量部程度が好ましく、1〜5重量部程度がより好ましい。1重量部未満では乳化時の樹脂エマルションの安定性が悪くなる場合があり、一方10重量部を超える場合には水分散型感圧接着剤組成物の耐水性が低下する傾向がある。   Examples of the emulsifier include anionic emulsifiers such as α-olefin sulfonated products, alkyl sulfates, alkylphenyl sulfates, polyoxyethylene alkylphenyl ether sulfates, polysoxyethylene aralkyl phenyl ether sulfosuccinic acid half ester salts, and rosin soaps; Nonionic emulsifiers such as oxyethylene alkylphenyl ether can be mentioned. These emulsifiers may be used independently and may use 2 or more types together. Although the usage-amount of an emulsifier is not specifically limited, About 1-10 weight part is preferable in conversion of solid content with respect to 100 weight part of tackifying resin, and about 1-5 weight part is more preferable. If the amount is less than 1 part by weight, the stability of the resin emulsion during emulsification may be deteriorated. On the other hand, if it exceeds 10 parts by weight, the water resistance of the water-dispersed pressure-sensitive adhesive composition tends to decrease.

また、粘着付与樹脂を乳化する方法としては、例えば、粘着付与樹脂をトルエン等の溶剤に溶解後、前記乳化剤とイオン交換水を添加し、高圧乳化機を用いて乳化した後、減圧下に溶剤を除去する方法;粘着付与樹脂の軟化点が約90℃以下となるよう少量のトルエン等の溶剤を混合し、続いて乳化剤を練り込み、更に熱水を徐々に添加して、転相乳化させてエマルションを得た後、減圧下に溶剤を除去するか又はそのまま使用する方法;オートクレーブ中に粘着付与樹脂の軟化点以上に昇温して乳化剤を練り込み熱水を徐々に添加して、転相乳化させてエマルション化する方法等を挙げることができる。   Further, as a method for emulsifying the tackifier resin, for example, after the tackifier resin is dissolved in a solvent such as toluene, the emulsifier and ion-exchanged water are added and emulsified using a high-pressure emulsifier, and then the solvent is reduced under reduced pressure. A small amount of a solvent such as toluene is mixed so that the softening point of the tackifying resin is about 90 ° C. or lower, followed by kneading the emulsifier, and then gradually adding hot water to phase inversion emulsification. After the emulsion is obtained, the solvent is removed under reduced pressure or used as it is; the temperature is raised above the softening point of the tackifying resin in the autoclave, the emulsifier is kneaded, hot water is gradually added, and Examples of the method include emulsification by phase emulsification.

本発明の水分散型感圧接着剤組成物において、粘着付与樹脂エマルション(B)の配合割合は、アクリル系ポリマーエマルション(A)中のポリマー成分100重量部に対して、粘着付与樹脂エマルション(B)中の粘着付与樹脂成分が5〜20重量部程度となる割合である。粘着付与樹脂エマルション(B)の配合割合が、粘着付与樹脂成分として5重量部未満では非極性被着体に対する密着性が不十分となり、耐水性が低下し、一方20重量部を超えると感圧接着剤層が硬くなり、非極性被着体に対する密着性が不十分となり、耐水性が低下するので、いずれも好ましくない。   In the water-dispersed pressure-sensitive adhesive composition of the present invention, the blending ratio of the tackifying resin emulsion (B) is based on 100 parts by weight of the polymer component in the acrylic polymer emulsion (A). ) In which the tackifying resin component is about 5 to 20 parts by weight. When the blending ratio of the tackifying resin emulsion (B) is less than 5 parts by weight as the tackifying resin component, the adhesion to the non-polar adherend becomes insufficient, the water resistance is lowered, and when it exceeds 20 parts by weight, the pressure is sensitive. Since the adhesive layer becomes hard, the adhesion to the nonpolar adherend becomes insufficient, and the water resistance is lowered, both are not preferable.

水分散型感圧接着剤組成物の調製方法
本発明の水分散型感圧接着剤組成物は、アクリル系ポリマーエマルション(A)、粘着付与樹脂エマルション(B)及び、必要に応じて、その他の任意成分を混合攪拌することによって、容易に調製することができる。
Preparation method of water-dispersed pressure-sensitive adhesive composition The water-dispersed pressure-sensitive adhesive composition of the present invention comprises an acrylic polymer emulsion (A), a tackifying resin emulsion (B), and other components as required. It can be easily prepared by mixing and stirring arbitrary components.

本発明の水分散型感圧接着剤組成物には、必要に応じて、ブロックイソシアネート化合物、エポキシ化合物、アジリジニル化合物、メラミン系化合物、オキサゾリン系化合物等の架橋剤を配合することができる。また、本発明の水分散型感圧接着剤組成物には、慣用的に使用されている各種の添加剤、例えば、着色剤(例えば、顔料や染料など)、充填剤、増粘剤、湿潤剤、消泡剤、可塑剤、防黴剤、老化防止剤、酸化防止剤などの添加剤が含まれていてもよい。   If necessary, the water-dispersed pressure-sensitive adhesive composition of the present invention may contain a crosslinking agent such as a blocked isocyanate compound, an epoxy compound, an aziridinyl compound, a melamine compound, or an oxazoline compound. The water-dispersed pressure-sensitive adhesive composition of the present invention includes various conventionally used additives such as colorants (for example, pigments and dyes), fillers, thickeners, and wets. Additives such as an agent, an antifoaming agent, a plasticizer, an antifungal agent, an anti-aging agent, and an antioxidant may be contained.

感圧接着剤塗工物
本発明の感圧接着剤塗工物は、フォームシート基材の少なくとも一方の面に、本発明水分散型感圧接着剤組成物を、感圧接着剤層として有するものである。
Pressure-sensitive adhesive coated product The pressure-sensitive adhesive coated product of the present invention has the water-dispersed pressure-sensitive adhesive composition of the present invention as a pressure-sensitive adhesive layer on at least one surface of a foam sheet substrate. Is.

当該感圧接着剤塗工物は、例えば、剥離紙、剥離フィルム、剥離シートなどの上に、本発明の水分散型感圧接着剤組成物を、塗布後、加熱などにより乾燥させ、厚さ10〜100μm程度の該組成物による感圧接着剤層の面を、ポリエチレン、ポリウレタン等のフォームシート基材の片面又は両面に貼り合わせることにより、容易に調製することができる。   The pressure-sensitive adhesive coated material is, for example, dried on a release paper, a release film, a release sheet, etc. by applying the water-dispersed pressure-sensitive adhesive composition of the present invention by heating or the like, It can be easily prepared by bonding the surface of the pressure-sensitive adhesive layer of the composition of about 10 to 100 μm to one side or both sides of a foam sheet substrate such as polyethylene and polyurethane.

また、当該感圧接着剤塗工物は、上記フォームシート基材の片面又は両面に、本発明の水分散型感圧接着剤組成物を、塗布後、加熱等により乾燥して、厚さ10〜100μm程度の感圧接着剤層を形成することによっても、容易に調製することができる。   The pressure-sensitive adhesive coated product has a thickness of 10 by applying the water-dispersed pressure-sensitive adhesive composition of the present invention to one side or both sides of the foam sheet base material, followed by drying by heating or the like. It can also be easily prepared by forming a pressure-sensitive adhesive layer of about ˜100 μm.

本発明の水分散型感圧接着剤組成物及び該組成物を用いた塗工物によれば、下記の如き格別顕著な効果が得られる。   According to the water-dispersed pressure-sensitive adhesive composition of the present invention and the coated product using the composition, the following remarkable effects can be obtained.

(1)本発明の水分散型感圧接着剤組成物をフォームシート基材に塗工してなるフォームシートは、強度、耐水性等の物性に優れているとともに、フォームシート基材との密着性等にも優れている。特に、該フォームシートは、非極性被着体に貼り付けた場合の耐水性にも優れる。したがって、本発明の水分散型感圧接着剤組成物の塗工物であるフォームシートは、自動車用、建材用、家電用等の該フォームシートが使用される幅広い分野において、好適に使用できる。   (1) A foam sheet formed by applying the water-dispersed pressure-sensitive adhesive composition of the present invention to a foam sheet substrate is excellent in physical properties such as strength and water resistance, and is in close contact with the foam sheet substrate. Excellent in properties. In particular, the foam sheet is excellent in water resistance when attached to a nonpolar adherend. Therefore, the foam sheet which is a coated product of the water-dispersed pressure-sensitive adhesive composition of the present invention can be suitably used in a wide range of fields in which the foam sheet is used, such as for automobiles, building materials, and home appliances.

(2)上記フォームシートは、耐水性に優れるので、水滴のかかる場所等の耐水性を必要とする場所での使用においても有効な接着性を保持できる。勿論、かかる場所以外で使用する汎用の感圧接着剤塗工フォームシートとしても有用である。   (2) Since the above foam sheet is excellent in water resistance, it can maintain effective adhesiveness even when used in a place requiring water resistance such as a place where water droplets are applied. Of course, it is also useful as a general-purpose pressure-sensitive adhesive-coated foam sheet used in other places.

(3)より具体的には、上記フォームシートは、それ自体として又は他の材料と接合して、例えば、自動車用モール、接合材(木質合板用、無機ボード用、木材用、金属用、プラスチック用等)、内装材(床用、天井用、壁用等)、制振材(自動車用、オーディオ用等)、保温・断熱材(自動車用、オーディオ用、家電用、建築用等)、防音材(自動車用、オーディオ用等)、保護材(自動車用、航空機用、家電用、オーディオ用、OA機器用等)等に、好適に使用することができる。   (3) More specifically, the foam sheet itself or bonded to other materials, for example, automobile moldings, bonding materials (wood plywood, inorganic board, wood, metal, plastic, for example) Etc.), interior materials (for floors, ceilings, walls, etc.), vibration-damping materials (for automobiles, audios, etc.), thermal insulation and heat insulating materials (for automobiles, audios, home appliances, constructions, etc.), soundproofing It can be suitably used for materials (for automobiles, for audio, etc.), protective materials (for automobiles, for aircraft, for home appliances, for audio, for office automation equipment, etc.).

以下、実施例及び比較例を挙げて、本発明をさらに詳細に説明する。但し、本発明はこれらによって限定されるものではない。尚、各例において、部及び%は、原則として、重量基準である。   Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. However, the present invention is not limited by these. In each example, parts and% are based on weight in principle.

実施例1
(1)アクリル系ポリマーエマルションの調製
還流冷却管、窒素導入管、温度計及び攪拌機を備えた反応容器にイオン交換水250部を入れ、攪拌しながら1時間窒素置換させた。これに過硫酸アンモニウム(重合開始剤)を1.5部加え、温度を60℃にし、その後、アクリル酸n−ブチル500部、メタクリル酸iso−ブチル50部、アクリル酸10部、n−ドデシルメルカプタン(連鎖移動剤)0.5部、及び「ラテムルS−180」(商品名、花王(株)製、有効成分:前記一般式(1)において、R=炭素数18のアルキル基、M=Naの化合物)20部を水120部で乳化したものを、3時間かけて滴下し、乳化重合させてアクリル系ポリマーエマルションを得た。
Example 1
(1) Preparation of acrylic polymer emulsion A reaction vessel equipped with a reflux condenser, a nitrogen inlet tube, a thermometer, and a stirrer was charged with 250 parts of ion-exchanged water and purged with nitrogen for 1 hour while stirring. To this, 1.5 parts of ammonium persulfate (polymerization initiator) was added, the temperature was adjusted to 60 ° C., and then 500 parts of n-butyl acrylate, 50 parts of iso-butyl methacrylate, 10 parts of acrylic acid, n-dodecyl mercaptan ( 0.5 parts of chain transfer agent) and “Latemul S-180” (trade name, manufactured by Kao Corporation, active ingredient: in the above general formula (1), R = alkyl group having 18 carbon atoms, M = Na Compound) 20 parts emulsified with 120 parts of water was added dropwise over 3 hours, and emulsion polymerization was carried out to obtain an acrylic polymer emulsion.

(2)粘着付与樹脂エマルションの調製
「ペンセルD−135」(商品名、荒川化学工業(株)製、粘着付与樹脂:重合ロジンエステル)100部を、トルエン60部に、100℃にて約1時間攪拌溶解した後、80℃まで冷却して、アニオン系乳化剤(ドデシルベンゼンスルホン酸ナトリウム)を固形分換算で3部およびイオン交換水160部を添加し、75℃にて1時間強攪拌して予備乳化を行った。得られた予備乳化物を高圧乳化機(マントンガウリン社製)により、300kg/cmの圧力で高圧乳化して乳化物を得た。次いで、減圧蒸留装置に前記乳化物200部を仕込み、50℃、100mmHgの条件下に6時間減圧蒸留を行い、固形分50%の粘着付与樹脂エマルションを得た。
(2) Preparation of Tackifying Resin Emulsion “Pencel D-135” (trade name, manufactured by Arakawa Chemical Industries, Ltd., tackifying resin: polymerized rosin ester) in 60 parts of toluene, about 1 at 100 ° C. After stirring and dissolving for a period of time, the mixture was cooled to 80 ° C., 3 parts of an anionic emulsifier (sodium dodecylbenzenesulfonate) and 160 parts of ion-exchanged water were added, and the mixture was vigorously stirred at 75 ° C. for 1 hour. Pre-emulsification was performed. The obtained preliminary emulsion was high-pressure emulsified with a high-pressure emulsifier (mantongaurin) at a pressure of 300 kg / cm 2 to obtain an emulsion. Next, 200 parts of the emulsion was charged into a vacuum distillation apparatus, and vacuum distillation was performed for 6 hours under the conditions of 50 ° C. and 100 mmHg to obtain a tackifier resin emulsion having a solid content of 50%.

(3)水分散型感圧接着剤組成物の調製
上記(1)で得られたアクリル系ポリマーエマルションのポリマー成分100部に対し、上記(2)で得られた粘着付与樹脂エマルションを樹脂成分として10部を混合して、水分散型感圧接着剤組成物を得た。
(3) Preparation of water-dispersed pressure-sensitive adhesive composition For 100 parts of the polymer component of the acrylic polymer emulsion obtained in (1) above, the tackifying resin emulsion obtained in (2) above was used as the resin component. 10 parts was mixed to obtain a water-dispersed pressure-sensitive adhesive composition.

(4)感圧接着剤塗工フォームシートの作製
上記(3)で得た感圧接着剤組成物を厚さ80μmの紙基材剥離紙に塗布し、100℃で3分乾燥し、厚さ70μmの感圧接着剤層を形成させた。この感圧接着剤層をポリエチレンフォームシート(30倍発泡、厚み5mm)の片面に貼り合わせ、感圧接着剤塗工フォームシートを作製した。
(4) Preparation of pressure-sensitive adhesive-coated foam sheet The pressure-sensitive adhesive composition obtained in (3) above was applied to a paper substrate release paper having a thickness of 80 μm, dried at 100 ° C. for 3 minutes, A 70 μm pressure sensitive adhesive layer was formed. This pressure-sensitive adhesive layer was bonded to one side of a polyethylene foam sheet (30-fold foaming, thickness 5 mm) to prepare a pressure-sensitive adhesive-coated foam sheet.

実施例2
実施例1において、メタクリル酸iso−ブチルを100部とした以外は、実施例1と同様の操作で感圧接着剤塗工フォームシートを作製した。
Example 2
In Example 1, a pressure-sensitive adhesive-coated foam sheet was prepared in the same manner as in Example 1, except that iso-butyl methacrylate was 100 parts.

実施例3
実施例1において、メタクリル酸iso−ブチルの代わりに、メタクリル酸n−ブチルを用いた以外は、実施例1と同様の操作で感圧接着剤塗工フォームシートを作製した。
Example 3
In Example 1, a pressure-sensitive adhesive-coated foam sheet was produced in the same manner as in Example 1 except that n-butyl methacrylate was used instead of iso-butyl methacrylate.

比較例1
実施例1において、メタクリル酸iso−ブチルの代わりに、酢酸ビニルを用いた以外は、実施例1と同様の操作で感圧接着剤塗工フォームシートを作製した。
Comparative Example 1
In Example 1, a pressure-sensitive adhesive-coated foam sheet was prepared in the same manner as in Example 1 except that vinyl acetate was used instead of iso-butyl methacrylate.

比較例2
実施例1においてメタクリル酸iso−ブチルを20部とした以外は、実施例1と同様の操作で感圧接着剤塗工フォームシートを作製した。
Comparative Example 2
A pressure-sensitive adhesive-coated foam sheet was produced in the same manner as in Example 1 except that 20 parts of iso-butyl methacrylate was used in Example 1.

比較例3
実施例1においてメタクリル酸iso−ブチルの代わりにメタクリル酸tert−ブチル200部を用いた以外は、実施例1と同様の操作で感圧接着剤塗工フォームシートを作製した。
Comparative Example 3
A pressure-sensitive adhesive-coated foam sheet was prepared in the same manner as in Example 1, except that 200 parts of tert-butyl methacrylate was used instead of iso-butyl methacrylate in Example 1.

評価試験
実施例1〜3及び比較例1〜3で得た各感圧接着剤塗工フォームシートについて、接着力及び耐水性の特性を試験した。試験方法は、下記の通りである。
Evaluation test The pressure-sensitive adhesive-coated foam sheets obtained in Examples 1 to 3 and Comparative Examples 1 to 3 were tested for adhesive strength and water resistance. The test method is as follows.

接着力
幅25mmの感圧接着剤塗工フォームシートを被着体(ポリプロピレン(PP)板)に2kgのゴムローラーを1往復して圧着し、30分間放置した後、剥離速度300mm/minで剥離して、被着体に対する接着力(N/25mm幅)を測定した。
A pressure sensitive adhesive-coated foam sheet with an adhesive width of 25 mm is pressed against a substrate (polypropylene (PP) plate) by reciprocating a 2 kg rubber roller, left for 30 minutes, and then peeled off at a peeling speed of 300 mm / min. Then, the adhesive force (N / 25 mm width) to the adherend was measured.

耐水性
感圧接着剤塗工フォームシートをPP板に2kgのゴムローラーを1往復して圧着し、室温で8時間水に浸し、取り出した直後、剥離速度300mm/minで剥離して、PP板に対する接着力(N/25mm幅)を測定する。
A water-resistant pressure-sensitive adhesive coated foam sheet is pressed against a PP plate by reciprocating a 2 kg rubber roller once, immersed in water at room temperature for 8 hours, and immediately after taking out, it is peeled off at a peeling speed of 300 mm / min. The adhesive force (N / 25 mm width) is measured.

表1に、各実施例及び比較例で使用した原料の内、メタクリル酸iso−ブチル(iso−BMA)、その代わりに用いたメタクリル酸n−ブチル(n−BMA)、メタクリル酸tert−ブチル(tert−BMA)及び酢酸ビニル、並びにこれらの使用量を示すと共に、得られた各感圧接着剤塗工フォームシートについての接着力及び耐水性の試験結果を示す。   In Table 1, among the raw materials used in each Example and Comparative Example, iso-butyl methacrylate (iso-BMA), n-butyl methacrylate (n-BMA) used instead, tert-butyl methacrylate ( tert-BMA) and vinyl acetate, and the amounts used thereof, as well as the test results of adhesive strength and water resistance for each of the resulting pressure-sensitive adhesive-coated foam sheets are shown.

Figure 0005185690
Figure 0005185690

表1から明らかなように、本発明の感圧接着剤塗工フォームシートは、特に非極性被着体に対する耐水強度に優れている。しかも、そのアクリル系ポリマーエマルションから作製された感圧接着剤塗工フォームシートは、非極性被着体に対する接着力強度も良好である。   As is apparent from Table 1, the pressure-sensitive adhesive-coated foam sheet of the present invention is particularly excellent in water resistance against nonpolar adherends. In addition, the pressure-sensitive adhesive-coated foam sheet produced from the acrylic polymer emulsion has good adhesion strength to the nonpolar adherend.

これに対して、ガラス転移温度が20℃〜110℃のメタクリル酸アルキルエステル以外の酢酸ビニルを使用したアクリル系ポリマーエマルションから得られる感圧接着剤塗工フォームシート(比較例1)では、耐水性が劣り、メタクリル酸アルキルエステルの共重合量が少ないアクリル系ポリマーエマルションから得られる感圧接着剤塗工フォームシート(比較例2)では、耐水性が悪く、また、メタクリル酸アルキルエステルの共重合量が多いアクリル系ポリマーエマルションから得られる感圧接着剤塗工フォームシート(比較例3)では、感圧接着剤層が硬くフォームシート基材に対する密着性が発現しないため、耐水性が悪くなる。   In contrast, in a pressure-sensitive adhesive coated foam sheet (Comparative Example 1) obtained from an acrylic polymer emulsion using vinyl acetate other than methacrylic acid alkyl ester having a glass transition temperature of 20 ° C. to 110 ° C., water resistance The pressure-sensitive adhesive coated foam sheet (Comparative Example 2) obtained from an acrylic polymer emulsion with a low copolymerization amount of the alkyl methacrylate ester is poor in water resistance and the copolymerization amount of the alkyl methacrylate ester. In the pressure-sensitive adhesive-coated foam sheet (Comparative Example 3) obtained from an acrylic polymer emulsion with a large amount of water, the pressure-sensitive adhesive layer is hard and does not exhibit adhesion to the foam sheet substrate, resulting in poor water resistance.

このように、ホモポリマーのガラス転移温度が20〜110℃を示すメタクリル酸アルキルエステル系モノマーを適切な範囲で共重合することによって達成される本発明の効果は、これまでのアクリル系ポリマーエマルションから得られる感圧接着剤塗工フォームシートでは、予期できないものである。

As described above, the effects of the present invention achieved by copolymerizing a homopolymeric alkyl methacrylate ester monomer having a glass transition temperature of 20 to 110 ° C. in an appropriate range can be obtained from conventional acrylic polymer emulsions. The resulting pressure sensitive adhesive coated foam sheet is unexpected.

Claims (2)

(A)炭素数2〜14のアルキル基を有するアクリル酸アルキルエステル(a)70〜95.9重量%、重合性不飽和カルボン酸(b)0.1〜10重量%、及びメタクリル酸n−ブチル、メタクリル酸iso−ブチルの少なくとも一種である(c)4〜20重量%を含有するモノマー混合物100重量部を、上記(a)〜(c)と共重合可能なエチレン性不飽和基を有する反応性界面活性剤(d)0.1〜10重量部の存在下に、水媒体中で乳化重合して得られるアクリル系ポリマーエマルション、並びに
(B)乳化剤の存在下に粘着付与樹脂を乳化して得られる粘着付与樹脂エマルションを、
前記アクリル系ポリマーエマルション(A)中のポリマー成分100重量部に対して、粘着付与樹脂エマルション(B)中の粘着付与樹脂成分を5〜20重量部の割合で含むことを特徴とする水分散型感圧接着剤組成物。
(A) Acrylic acid alkyl ester having an alkyl group having 2 to 14 carbon atoms (a) 70 to 95.9% by weight, polymerizable unsaturated carboxylic acid (b) 0.1 to 10% by weight, and methacrylic acid n- 100 parts by weight of a monomer mixture containing 4 to 20% by weight of (c) which is at least one of butyl and iso-butyl methacrylate has an ethylenically unsaturated group copolymerizable with the above (a) to (c) Reactive surfactant (d) An acrylic polymer emulsion obtained by emulsion polymerization in an aqueous medium in the presence of 0.1 to 10 parts by weight, and (B) a tackifier resin in the presence of an emulsifier. The tackifying resin emulsion obtained by
A water-dispersed type comprising 5 to 20 parts by weight of the tackifying resin component in the tackifying resin emulsion (B) with respect to 100 parts by weight of the polymer component in the acrylic polymer emulsion (A) Pressure sensitive adhesive composition.
フォームシート基材の少なくとも一方の面に、請求項1記載の水分散型感圧接着剤組成物を、感圧接着剤層として有する感圧接着剤塗工物。A pressure-sensitive adhesive coated product having the water-dispersed pressure-sensitive adhesive composition according to claim 1 as a pressure-sensitive adhesive layer on at least one surface of a foam sheet substrate.

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