JP2020019885A - Application method of adhesive composition - Google Patents
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- JP2020019885A JP2020019885A JP2018144540A JP2018144540A JP2020019885A JP 2020019885 A JP2020019885 A JP 2020019885A JP 2018144540 A JP2018144540 A JP 2018144540A JP 2018144540 A JP2018144540 A JP 2018144540A JP 2020019885 A JP2020019885 A JP 2020019885A
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Abstract
Description
本発明は、被接着基材間に挟んで熱圧着することにより溶融軟化して接着作用を発揮させる接着剤組成物に関するものであり、特に、接着させたときに透明で、その後に剥がしたときにその痕跡が不透明となり、目視により剥がしたことが確認可能な用途に用いられる接着剤組成物およびその使用方法に関するものである。 The present invention relates to an adhesive composition which exhibits a bonding action by being melted and softened by being sandwiched between substrates to be bonded and thermocompression-bonded, particularly when the composition is transparent when bonded and then peeled off. More particularly, the present invention relates to an adhesive composition used for applications in which its traces become opaque and can be visually confirmed to have peeled off, and a method for using the same.
従来、例えば容器あるいは包装フィルム、封書、証明書等の故意または無作為による開封に関し、その開封有無を容易に判別する方法や開封防止策が種々提案されている。例えば、特開２０１７−１０７００１号公報には感熱性マイクロカプセルを用いる例が開示されている。封緘する為に用いる粘着剤は、加熱によって接着強度が低下する性質が悪用され、開封されてしまうという欠点があるので、これを、加熱時にマイクロカプセルが破壊され発色するという方法で発見容易にするものであるが、加熱圧着で封緘する方法に用いるには、加熱圧着時に発色してしまう危険性があるので、適用が難しい。 2. Description of the Related Art Conventionally, various methods for easily determining whether or not to open a container or a packaging film, a sealed letter, a certificate, or the like intentionally or at random have been proposed. For example, JP-A-2017-107001 discloses an example in which heat-sensitive microcapsules are used. The adhesive used for sealing has the drawback that the property that the adhesive strength is reduced by heating is abused, and the adhesive is opened, so this can be easily found by a method in which the microcapsules are destroyed and colored when heated. However, it is difficult to apply the method for sealing by thermocompression since there is a risk of coloring at the time of thermocompression.
また、シ−ルを貼付けた封緘部が開封によりシ−ルが破壊され開封有無が容易に判断できるというものもあるが、封緘剤と貼付用シ−ルを別々に用意する必要があるか、あるいは貼付用シ−ルが封緘剤そのものである必要がある。いずれしても貼付用シ−ルは粘着剤を使用して貼りつけるものなので、加熱によって剥離強度を低下させ開封されてしまうという欠点は避けられない。 In addition, there is a case where the sealing portion to which the seal is attached is broken by opening the seal and the presence or absence of the opening can be easily determined.However, it is necessary to separately prepare a sealing agent and a sealing seal. Alternatively, the seal for application must be the sealant itself. In any case, since the sticking seal is stuck using an adhesive, the drawback that the peel strength is lowered by heating and the package is opened cannot be avoided.
更に、開封により基材の一部の破壊を伴うものとして特許５０８２００８号公報があげられる。当該特許の直接の目的は易開封性容器であるが、開封後にミシン目で切り離された蓋の一部が除去されているので外観変化が生じ目視で判別化可能である。また、特許第２９３６９６９号には基材にフィルム層、下地層、無機粉末を含むヒートシ−ル層を順次積層した蓋材が開示されており、開封時に下地層とヒートシ−ル層の層間剥離が起こり開封部に層間剥離したヒートシ−ル層を痕跡として残すことが可能というものである。斯様なように開封有無を容易に目視で判別できる工夫は数多く提案されているが、接着剤自体により目視により開封有無の判断が可能なものは知られていない。 Further, Japanese Unexamined Patent Publication (Kokai) No. 5082008 discloses a method in which a part of the substrate is broken by opening. The direct object of the patent is an easily-openable container, but since the part of the lid cut off at the perforation is removed after opening, the appearance changes and the discrimination can be made visually. Japanese Patent No. 2936969 discloses a lid material in which a film layer, a base layer, and a heat seal layer containing inorganic powder are sequentially laminated on a base material. It is possible to leave a delaminated heat seal layer in the opened portion as a trace. There have been proposed many devices for easily determining the presence or absence of opening as described above, but there is no known device that can determine the presence or absence of opening with the adhesive itself.
本発明は前記従来の接着剤組成物では実施できなかった接着時には透明で、且つ剥がしたときに化学変化や、基材の破壊等を伴うことのない接着剤自体の性質を利用することにより目視により開封有無の判断が可能な接着剤組成物を提供することを課題とする。 The present invention is visually implemented by utilizing the properties of the adhesive itself which is transparent at the time of bonding, which cannot be performed with the conventional adhesive composition, and which does not involve chemical change or destruction of the substrate when peeled off. It is an object of the present invention to provide an adhesive composition from which the presence or absence of opening can be determined.
前記課題を解決するためになされた本発明である接着剤組成物は、所定の加熱温度において相溶性を有して溶融するとともに互いに屈折率が異なる少なくとも２種類の熱可塑性樹脂と、前記熱可塑性樹脂に非相溶性で平均粒径が０．３〜２０μｍの微粒子と、溶媒と
、からなることを特徴とする。
An adhesive composition according to the present invention made to solve the above-mentioned problem has at least two kinds of thermoplastic resins having different refractive indices while melting and having compatibility at a predetermined heating temperature, and the thermoplastic resin. It is characterized by comprising fine particles having an average particle diameter of 0.3 to 20 μm, which are incompatible with the resin, and a solvent.
また、前記本発明において、微粒子の配合量が前記熱可塑性樹脂１００重量部あたり０
．５〜３０重量部であり、殊に、前記微粒子がゴム組成物であると好ましい。
Further, in the present invention, the blending amount of the fine particles is 0 per 100 parts by weight of the thermoplastic resin.
. It is preferably 5 to 30 parts by weight, particularly preferably the fine particles are a rubber composition.
更に、本発明である接着剤組成物の使用方法は、互いに接着しようとする被接着基材の少なくとも一方の接着面に前記本発明である接着剤組成物を塗布するとともに溶媒を除去して乾燥させ、その接着面を熱圧着することにより前記塗布乾燥させた接着剤組成物を相溶状態で溶融軟化し前記被接着基材層間に透明な接着層を形成して接着作用を発揮させるともに前記被接着基材を剥離させたときに前記透明であった接着層に形成されている熱圧着部分が剥離時の剥離抵抗により乱反射面を形成して不透明化することによりその痕跡を目視により確認することを可能としたことを特徴とする。 Further, the method of using the adhesive composition of the present invention includes applying the adhesive composition of the present invention to at least one bonding surface of the substrates to be bonded to each other and removing the solvent, followed by drying. The adhesive surface is melt-softened in a compatible state by thermocompression bonding of the adhesive surface to form a transparent adhesive layer between the substrates to be bonded, thereby exhibiting an adhesive effect. When the substrate to be bonded is peeled off, the thermocompression bonding portion formed on the transparent adhesive layer forms an irregular reflection surface due to the peeling resistance at the time of peeling and becomes opaque, and the trace is visually confirmed. It is characterized by being able to do.
本発明によると、被接着基材間に挟まれた溶媒が除去乾燥された接着剤組成物を所定の加熱温度で熱圧着することにより溶融軟化して透明で且つ強固な接着作用を発揮させ、剥がしたときにその剥がした面に残存する接着面が不透明化してその痕跡を目視により確認することが可能であり、特に、食品、医療、その他の分野でバージン性を必要とする容器や包装などの開口部の接着剤として広く使用することができるものである。 According to the present invention, the solvent sandwiched between the substrates to be bonded is removed and dried and the adhesive composition is melt-softened by thermocompression bonding at a predetermined heating temperature to exhibit a transparent and strong adhesive action, When peeled, the adhesive surface remaining on the peeled surface becomes opaque and its traces can be visually confirmed, especially for containers and packaging that require virginity in food, medicine, and other fields. It can be widely used as an adhesive for the opening of the above.
本発明である接着剤組成物は、所定の加熱温度において相溶性を有して溶融するとともに互いに屈折率が異なる少なくとも２種類の熱可塑性樹脂と、前記熱可塑性樹脂に非相溶性で平均粒径が０．３〜２０μｍの微粒子と、溶媒と、から構成される。 The adhesive composition according to the present invention has at least two types of thermoplastic resins having compatibility and melting at a predetermined heating temperature and different in refractive index from each other, and an average particle size incompatible with the thermoplastic resin. Is composed of fine particles of 0.3 to 20 μm and a solvent.
そして、前記熱可塑性樹脂は、被接着基材の種類などにより選択されるが、剥がしたときにその剥がした面に残存する接着面が不透明化してその痕跡を目視により確認するためには両者の屈折率に差があるものが好ましいが、接着剤組成物を被接着基材間に挟んで塗布し所定の加熱温度で熱圧着することにより溶融軟化して透明で且つ強固な接着作用を発揮させるためには屈折率が近いものを用いることが好ましく、例えばエチレン−酢酸ビニル共重合体、エチレン−（メタ）アクリル酸エステル共重合体、エチレン−酢酸ビニル共重合体の無水マレイン酸変性物、エチレン−（メタ）アクリル酸エステル共重合体−無水マレイン酸共重合体、エチレン−（メタ）アクリル酸共重合体およびその金属塩、エチレン−αオレフィン共重合体等のエチレン系（共）重合体、プロピレン−αオレフィン共重合体、およびその不飽和カルボン酸変性物、熱可塑性ポリウレタン等エチレン−酢酸ビニル共重合体、エチレン−（メタ）アクリル酸エステル共重合体、エチレン−酢酸ビニル共重合体の無水マレイン酸変性物、エチレン−（メタ）アクリル酸エステル共重合体−無水マレイン酸共重合体、エチレン−（メタ）アクリル酸共重合体およびその金属塩、エチレン−αオレフィン共重合体、プロピレン−αオレフィン共重合体、およびその不飽和カルボン酸変性物等のオレフィン系重合体から選ばれた少なくとも一種と、熱可塑性ポリウレタン、熱可塑性ポリエステルから選ばれた少なくとも一種を組み合わせて用いることができる
。
The thermoplastic resin is selected depending on the type of the base material to be bonded, and the like. However, when peeled, the adhesive surface remaining on the peeled surface becomes opaque, and in order to visually confirm the trace, both of the two are used. Although those having a difference in the refractive index are preferable, the adhesive composition is sandwiched between the substrates to be adhered and melt-softened by thermocompression bonding at a predetermined heating temperature to exhibit a transparent and strong adhesive action. For this purpose, it is preferable to use those having a refractive index close to each other. For example, ethylene-vinyl acetate copolymer, ethylene- (meth) acrylate copolymer, maleic anhydride-modified ethylene-vinyl acetate copolymer, ethylene -(Meth) acrylic acid ester copolymer-maleic anhydride copolymer, ethylene- (meth) acrylic acid copolymer and its metal salt, ethylene-α-olefin copolymer, etc. Tylene-based (co) polymer, propylene-α-olefin copolymer and unsaturated carboxylic acid modified product thereof, ethylene-vinyl acetate copolymer such as thermoplastic polyurethane, ethylene- (meth) acrylate copolymer, ethylene Maleic anhydride-modified vinyl acetate copolymer, ethylene- (meth) acrylate copolymer-maleic anhydride copolymer, ethylene- (meth) acrylic acid copolymer and its metal salt, ethylene-α An olefin copolymer, a propylene-α-olefin copolymer, and at least one selected from olefin polymers such as an unsaturated carboxylic acid modified product thereof, and at least one selected from thermoplastic polyurethane and thermoplastic polyester Can be used.
また、前記オレフィン系重合体と熱可塑性ポリウレタンまたは／および熱可塑性ポリエステルの重量比率は８０／２０〜２０／８０が好適である。 The weight ratio of the olefin polymer to the thermoplastic polyurethane or / and the thermoplastic polyester is preferably from 80/20 to 20/80.
更に、前記微粒子は、前記熱可塑性樹脂に対して非相溶性のものが好ましく、特に、表面が太陽光に対して乱反射し易い微粒子が好ましく、例えばゴムやシリカの微粒子の使用が好ましい。尚、シリカについては、剥離強度の改良あるいは剥離前後の変色変化の大きさの点で板状のシリカが最も好ましい。 Further, the fine particles are preferably incompatible with the thermoplastic resin, and are particularly preferably fine particles whose surface is easily irregularly reflected with respect to sunlight. For example, fine particles of rubber or silica are preferably used. As for silica, plate-like silica is most preferable in terms of improvement in peel strength or a change in color change before and after peeling.
ゴム微粒子としては、例えば天然ゴム、ブタジエンゴム、イソプレンゴム、スチレン−ブタジエンゴム、フッソゴム、シリコ−ンゴム、クロルスルフォン化ポリエチレン等が例示されるが、加熱・圧着された際に、粒子自体が溶融するものは好ましくない傾向にあり
、加硫、架橋された構造を持つゴム微粒子が特に好ましい。シリカ成分としては、例えば二酸化ケイ素もしくは二酸化ケイ素を主成分とした化合物が好ましく、合成物、天然物を問わない。
Examples of the rubber fine particles include, for example, natural rubber, butadiene rubber, isoprene rubber, styrene-butadiene rubber, fluorine rubber, silicone rubber, chlorsulfonated polyethylene, and the like. However, rubber fine particles having a vulcanized or crosslinked structure are particularly preferable. As the silica component, for example, silicon dioxide or a compound containing silicon dioxide as a main component is preferable, and it does not matter whether it is a synthetic product or a natural product.
また、本発明に用いられる前記微粒子は、平均粒子径は０．３〜２０μ以下のものがよい。平均粒子径が０．３ミクロン未満であると剥離前後の変色変化の割合が少なく、２０
μを超えると接着剤の厚みにもよるが熱圧着時に被接着基材間で平滑にならず剥離時の変色変化が少なく判別しにくくなるためである。
The fine particles used in the present invention preferably have an average particle diameter of 0.3 to 20 μm or less. When the average particle size is less than 0.3 micron, the rate of change in discoloration before and after peeling is small,
If it exceeds μ, it depends on the thickness of the adhesive, but it will not be smooth between the substrates to be bonded at the time of thermocompression bonding.
更に、前記微粒子の配合量は前記熱可塑性樹脂１００重量部あたり０．５〜３０重量部であるとよい。０．５重量部未満であると剥離強度改良や変色変化に貧しく、３０重量部を超えると熱圧着性が悪くなるためである。 Further, the compounding amount of the fine particles is preferably 0.5 to 30 parts by weight per 100 parts by weight of the thermoplastic resin. If the amount is less than 0.5 part by weight, the improvement in peel strength and the change in discoloration are poor.
加えてまた、本発明における接着剤組成物は、水および／あるいは有機溶媒に溶解あるいは分散させることにより塗布可能としている。殊に、環境衛生面、安全性等を考慮すれば水分散体が好ましい。これら接着組成物の構成成分は市販品を適宜選択するか、あるいは必要に応じて特開昭５８−１２７７５２号公報、特開昭５８−１１８８４３号公報記載の方法等で製造したものを用いればよい。勿論、少量の有機溶媒としてアルコール類、ケトン類、エステル類等の親水性溶媒を併用することは差支えない。 In addition, the adhesive composition of the present invention can be applied by dissolving or dispersing in water and / or an organic solvent. In particular, an aqueous dispersion is preferable in consideration of environmental hygiene, safety, and the like. As the components of these adhesive compositions, commercially available products may be appropriately selected or, if necessary, those produced by the method described in JP-A-58-127752 and JP-A-58-118843 may be used. . Of course, a small amount of an organic solvent may be used in combination with a hydrophilic solvent such as alcohols, ketones and esters.
尚、本発明である接着剤組成物の使用に適した被接着基材としては、例えば蓋付きの容器あるいは包装フィルム、封書、証明書等に用いられるプラスチックフィルム、シ−ト、箔、紙などが挙げられる、特に、ポリエチレンフタレ−ト、ポリナフタレンフタレ−ト、ポリプロピレン、ポリカーボネート、ポリスチレン、エチレン−ビニルアルコール共重合体、ポリアミド、ポリ塩化ビニル等のフィルム、シ−ト、その金属蒸着物、無機物蒸着物
、コロナ放電物やその表面処理物等が適している。
In addition, as a substrate to be adhered suitable for use of the adhesive composition of the present invention, for example, a container with a lid or a packaging film, a plastic film used for a seal, a certificate, etc., a sheet, a foil, a paper, etc. In particular, films such as polyethylene phthalate, polynaphthalene phthalate, polypropylene, polycarbonate, polystyrene, ethylene-vinyl alcohol copolymer, polyamide, and polyvinyl chloride, sheets, and metal deposits thereof Inorganic deposits, corona discharges and surface treatments thereof are suitable.
また、被接着基材であるプラスチックフィルム、シ−トが透明性、強度、耐熱性、引き裂き性を改良する為に延伸されたものであってもよく、ガスバリヤ−性、引き裂き性、熱圧着性の均質化、剥離感等改良の為に他のプラスチックフィルムが積層されていてもよい
。
Further, the plastic film or sheet as the substrate to be bonded may be stretched to improve transparency, strength, heat resistance and tearing property, and may have gas barrier property, tearing property and thermocompression bonding property. Another plastic film may be laminated to improve the homogeneity of the resin and the feeling of peeling.
これら被接着基材にあっては接着する部位が剥離後の変化が目視により判別できるほどの透明性が必要であるが他の部位は不透明であっても構わない。 In these substrates to be adhered, transparency is required so that the change after peeling of the adhered portion can be visually recognized, but other portions may be opaque.
本実施の形態では接着剤は少なくとも２種類の異なる種類の熱可塑性樹脂により形成されているが、溶融接着時に互いに相溶する性質を有し両者の屈折率が近いものを選択することできわめて透明な接着面が形成されるので、透明性を有する被接着基材を通じて接着していることが目視される。 In the present embodiment, the adhesive is formed of at least two different types of thermoplastic resins, but is extremely transparent by selecting one having a property of being compatible with each other during fusion bonding and having a refractive index close to each other. Since a strong bonding surface is formed, it is visually observed that the bonding is performed through the base material having transparency.
次に、前記被接着基材である蓋体を開けて接着状態が剥がれると、接着部位が剥離時に剥離抵抗により表面凹凸、ボイド等が変化する為、剥離面が乱反射して不透明化し（本実施の形態では白色）目視により接着状態が解除されて蓋が開封したことが確認できる。特に、本実施の形態では接着剤として異なる種類の熱可塑性樹脂を組み合わせているので剥がしたときに表面凹凸、ボイド等の変化が表出し易く、更に、予め微粒子を加えているのでこれらの微粒子も剥がした面に露出して不透明化を増大する。 Next, when the lid, which is the substrate to be bonded, is opened and the bonding state is peeled off, the surface of the bonding surface changes due to the peeling resistance when peeling off, the surface irregularities, voids, etc. change. (White in the form of (1)) It can be confirmed by visual inspection that the adhesive state has been released and the lid has been opened. In particular, in the present embodiment, since different types of thermoplastic resins are combined as an adhesive, surface irregularities when peeled off, changes in voids and the like are easy to appear, and since these particles are added in advance, these particles are also used. Exposed on the peeled surface to increase opacity.
また、接着前の被接着基材に若干のボイドやあるいは光を乱反射する凹凸があっても、熱圧着時に、充分な熱圧が負荷されることによりに軟化・流動して平滑な光の乱反射が少ない構造となり、剥離時の剥離抵抗により生じたボイドや表面凹凸による光の乱反射との差が顕著となり、目視により剥離を確認することができる。 In addition, even if the substrate to be bonded has slight voids or irregularities that diffusely reflect light, the surface is softened / flowed due to the application of sufficient heat pressure during thermocompression bonding, and the diffused reflection of light is smooth. And the difference between voids generated due to peeling resistance at the time of peeling and irregular reflection of light due to surface unevenness becomes remarkable, and peeling can be visually confirmed.
尚、接着剤は極力屈折率の差が小さいものの組み合わせを選択することが好ましい。これは接着剤自体が剥離前から不透明であると剥離後の変色変化の判別が困難になるためである。止むを得ず屈折率の差が大きなものを使用する際はその使用量に大きな差をつける必要がある。広範囲な比率で配合可能で、しかも被接着基材の対象範囲を広げることが可能な点から熱可塑性樹脂成分としては前記エチレン系（共）重合体と熱可塑性ポリウレタンを併用することが特に好ましい。 Note that it is preferable to select a combination of adhesives having the smallest difference in refractive index as much as possible. This is because if the adhesive itself is opaque before peeling, it is difficult to determine the change in discoloration after peeling. When it is unavoidable to use a material having a large difference in refractive index, it is necessary to make a large difference in the amount of use. As the thermoplastic resin component, it is particularly preferable to use the ethylene-based (co) polymer and the thermoplastic polyurethane together as the thermoplastic resin component because it can be blended in a wide range of ratios and can expand the target range of the substrate to be bonded.
次に、本発明の実施例について説明する。 Next, examples of the present invention will be described.
本実施例は、例えば透明な厚み２００μｍポリエチレンテレフタレート製の食品容器の蓋と容器本体との互いに接合する面を接着基材とする場合に本発明である表１における実施例１乃至実施例３に記載の接着剤組成物を実施したものであり、初めに被接着基材の少なくとも一方の接着面に本発明である接着剤組成物を大佑機材社のバーコーター＃１０（
膜厚２２．９０μｍ）にて塗布し、ハンドドライヤーにて熱風乾燥して熱圧着用基材を得た溶媒または水分を蒸発させて乾燥させておく。そして、前記被接着基材の接着剤塗布面と接着剤を塗布していない被接着基材に重ねあわせ（容器本体に蓋をして）、１２０℃、１３０℃、１４０℃および１５０℃の加熱温度で、０．５ＭＰａの圧力を加えてそれぞれ２秒間熱圧着して室温に放置した。尚、使用したエチレン酢酸ビニル共重合体の屈折率は１．４、ポリウレタンの屈折率は１．５のものを用いた。
This embodiment is similar to the first to third embodiments in Table 1 of the present invention when the surface of the food container made of polyethylene terephthalate having a transparent thickness of 200 μm, for example, is used as the adhesive base material when the surface to be joined to the container body is used as an adhesive base material. The adhesive composition according to the present invention was carried out. First, the adhesive composition of the present invention was applied to at least one adhesive surface of a substrate to be adhered with a bar coater # 10 (trade name, manufactured by Daisuke Kikai Co., Ltd.).
The solvent or moisture from which the substrate for thermocompression bonding was obtained by hot-air drying with a hand dryer was evaporated to dryness. Then, the adhesive-coated surface of the substrate to be bonded and the substrate to which the adhesive is not applied are overlapped (with the lid of the container body), and heated at 120 ° C., 130 ° C., 140 ° C. and 150 ° C. At a temperature, a pressure of 0.5 MPa was applied, and each was thermocompressed for 2 seconds and left at room temperature. The ethylene-vinyl acetate copolymer used had a refractive index of 1.4 and the polyurethane had a refractive index of 1.5.
然る後、接着面を手で剥離してその剥離面の状態を接着剤が塗布された基材を通して目視される状態を観察した。また、その時の剥離状態（界面剥離：接着剤塗布面に９０％以上接着剤が残存、接着剤剥離：接着剤が塗布基材から剥離、凝集剥離：接着剤自体が破断
）と１５ｍｍ幅でのＴピール（剥離）強度を剥離強度試験機にて測定した。実施例および比較例の組成条件を表１に示す。尚、表中の単位は固形分換算（水または溶媒を除いた）した重量を表す。尚、実施例に使用したエチレン酢酸ビニル共重合体は三井化学社の水性分散体“ケミパールＶ１００(登録商標)”を、ポリウレタンは第一工業製薬社の水性分散体“スーパーフレックスＥ２０００（登録商標）”を、ゴム粒子は信越化学社のシリコーンゴム“ＫＭシリーズ”を用いたが、これらに限定されるものではない。また、表中記載の微粒子の添加量は熱可塑性樹脂１００重量部あたりの添加量（重量部）である。
Thereafter, the adhesive surface was peeled off by hand, and the state of the peeled surface was visually observed through the substrate to which the adhesive was applied. In addition, the peeling state at that time (interfacial peeling: 90% or more of the adhesive remains on the adhesive applied surface, adhesive peeling: the adhesive peeled off from the applied base material, cohesive peeling: the adhesive itself was broken) and the 15 mm width The T-peel (peel) strength was measured with a peel strength tester. Table 1 shows the composition conditions of the examples and comparative examples. The unit in the table represents the weight in terms of solid content (excluding water or solvent). The ethylene-vinyl acetate copolymer used in the examples was an aqueous dispersion "Chemipearl V100 (registered trademark)" manufactured by Mitsui Chemicals, and the polyurethane was an aqueous dispersion "Superflex E2000 (registered trademark)" manufactured by Daiichi Kogyo Seiyaku. The rubber particles used were silicone rubber “KM series” manufactured by Shin-Etsu Chemical Co., Ltd., but are not limited thereto. Further, the addition amount of the fine particles described in the table is the addition amount (parts by weight) per 100 parts by weight of the thermoplastic resin.
次に、前記実施例と比較例について、接着面を手で剥離してその剥離面の状態を接着剤が塗布された基材を通して目視される状態を観察した。また、その時の剥離状態（界面剥離：接着剤塗布面に９０％以上接着剤が残存、接着剤剥離：接着剤が塗布基材から剥離、凝集剥離：接着剤自体が破断）と１５ｍｍ幅でのＴピール（剥離）強度（Ｎ）を剥離強度試験機にて測定した。その結果を図面に示す。 Next, in the above Examples and Comparative Examples, the adhesive surface was peeled off by hand, and the state of the peeled surface was visually observed through a substrate coated with an adhesive. In addition, the peeling state at that time (interfacial peeling: 90% or more of the adhesive remains on the adhesive applied surface, adhesive peeling: the adhesive peeled off from the applied base material, cohesive peeling: the adhesive itself was broken) and the 15 mm width The T-peel (peel) strength (N) was measured with a peel strength tester. The result is shown in the drawing.
図１および図に示したように、実施例１および実施例２では１２０℃、１３０℃、１４
０℃、１５０℃のいずれの加熱温度の場合も剥がす前（「右側」以下同じ）は十分透明であって、剥がした後（「左側」以下同じ）は白化が顕著に見られた。これに対して図３に示したように微粒子を含まない比較例１および図４に示したように適正重量比を超えた比較例２では剥がす前は十分に透明であったが、剥がした後は白化を得られなかった。
As shown in FIGS. 1 and 2, in Examples 1 and 2, 120 ° C., 130 ° C., 14 ° C.
At any of the heating temperatures of 0 ° C. and 150 ° C., the film was sufficiently transparent before peeling (the same applies to “right side” and thereafter), and whitening was remarkably observed after peeling (the same applies to “left side” and below). On the other hand, in Comparative Example 1 containing no fine particles as shown in FIG. 3 and Comparative Example 2 exceeding the proper weight ratio as shown in FIG. 4, it was sufficiently transparent before peeling, but after peeling. Did not obtain whitening.
これらのことから本発明である接着剤組成物が接着時には透明で、且つ剥がしたときに化学変化や、基材の破壊等を伴うことのない接着剤自体の性質を利用することにより目視により開封有無の判断が可能な接着剤組成物を提供することが確認された。
From these facts, the adhesive composition of the present invention is transparent at the time of bonding, and is visually opened by utilizing the properties of the adhesive itself which does not involve chemical change or destruction of the substrate when peeled off. It was confirmed that an adhesive composition capable of determining the presence or absence was provided.
本発明は、被接着基材間に挟んで熱圧着することにより溶融軟化して接着作用を発揮させる接着剤組成物に関するものであり、特に、接着させたときに透明で、その後に剥がしたときにその痕跡が不透明となり、目視により剥がしたことが確認可能な用途に用いられる接着剤組成物の使用方法に関するものである。 The present invention relates to an adhesive composition which exhibits a bonding action by being melted and softened by being sandwiched between substrates to be bonded and thermocompression-bonded, particularly when the composition is transparent when bonded and then peeled off. its mark is opaque, it relates to the use of the adhesive composition be stripped visually be used to verify possible applications to.
本発明は前記従来の接着剤組成物では実施できなかった接着時には透明で、且つ剥がしたときに化学変化や、基材の破壊等を伴うことのない接着剤自体の性質を利用することにより目視により開封有無の判断が可能な接着剤組成物の使用方法を提供することを課題とする。 The present invention is visually implemented by utilizing the properties of the adhesive itself which is transparent at the time of bonding, which cannot be performed with the conventional adhesive composition, and which does not involve chemical change or destruction of the substrate when peeled off. It is an object of the present invention to provide a method for using an adhesive composition, which can determine the presence or absence of opening.
Claims (4)
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