JP2004252225A - Re-sticking preventing label and continuous body of the label - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To completely peel a label base material constituting a re-sticking preventing label without being accompanied with an adhesive when the label is peeled off from a stuck object, and to destroy a sticking function sticking to another sticking object once more. <P>SOLUTION: This re-sticking preventing label 12 consists of a label base material 14, an intermediate layer 16 formed on one main face of the base material 14, and an adhesive layer 18 formed on the intermediate layer 16. The intermediate layer 16 has a pigment and polyolefin resin as principal components, and is composed to have the product of the square root of the thickness of the intermediate layer 16 expressed in μm and the content of the pigment in wt.% of 40 to 300. The continuous body 10 of the re-sticking preventing label has the labels 12 continuously temporarily attached on a peeling-off mount 20. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【００１７】
中間層１６の上（ラベル基材１４とは反対側の主面）には、粘着剤層１８が形成されている。
粘着剤としては、アクリル系粘着剤、天然ゴム系粘着剤、合成ゴム系粘着剤等の公知の粘着剤が使用されるが、これに限定されるものではない。
また、粘着剤層１８の厚さは、特に限定されないが、通常７〜６０μｍ、好ましくは１０〜３５μｍ程度である。
【００１８】
ラベル基材１４の上（中間層１６が形成された面とは反対側の主面）には、記録層２２が形成されている。この実施形態では、記録層２２としてラベル基材１４の表面上に感熱発色層が形成されている。
この感熱発色層は、それをプリンターのサーマルヘッド等が加熱することによって発色させることができる。
感熱発色層としては、たとえばロイコ染料、顕色剤および結着剤の混合物を含む感熱発色剤を塗布・乾燥することによって形成される。
【００１９】
この場合、ロイコ染料としては、この種の感熱発色剤に適用されるものを任意に選択することができ、単独で使用してもよいし、２種類以上を併用してもよい。このようなロイコ染料の例としては、たとえば、フルオラン系、トリアニルメタン系、トリフェニルメタン系、チアジン系、スピロピラン系、ラクタム系、オーラミン系、インドリノフタリド系などのロイコ化合物が好ましく用いられる。なかでも、フルオラン系のロイコ化合物は、単一の化合物で黒色発色が可能であり、他の系の化合物に比べて、画像安定性が良好であるため、ロイコ染料として特に好ましい。
ロイコ染料の具体例としては、たとえば、３−（Ｎ−イソペンチル−Ｎ−エチル）アミノ−６−メチル−７−ｏ−クロロアニリノフルオラン、３−ジペンチルアミノ−６−メチル−７−アニリノフルオラン、３−ジエチルアミノ−６−メチル−７−ｐ−トルイジノフルオラン、クリスタルバイオレットラクトン、３−（Ｎ−エチル−Ｎ−イソペンチル）アミノ−６−メチル−７−アニリノフルオラン、３−ジエチルアミノ−６−メチル−７−アニリノフルオラン、３−（Ｎ−エチル−ｐ−トルイジノ）−６−メチル−７−アニリノフルオラン、３−ピロリジノ−６−メチル−７−アニリノフルオラン、３−ジ（ｎ−ブチル）アミノ−６−メチル−７−アニリノフルオラン、３−（Ｎ−シクロヘキシル−Ｎ−メチル）アミノ−６−メチル−７−アニリノフルオラン、３−ジエチルアミノ−７−（ｏ−クロロアニリノ）フルオラン、３−ジブチルアミノ−７−（ｏ−クロロアニリノ）フルオラン、３−ジエチルアミノ−７−（ｍ−トリフルオロメチルアニリノ）フルオラン、３−ジメチルアミノ−５−メチル−７−メチルフルオラン、３−（Ｎ−メチル−Ｎ−ｎ−プロピル）アミノ−６−メチル−７−アニリノフルオラン、３−（Ｎ−イソブチル−Ｎ−エチル）アミノ−６−メチル−７−アニリノフルオラン、３−（Ｎ−エトキシプロピル−Ｎ−エチル）アミノ−６−メチル−７−アニリノフルオラン、３−ジブチルアミノ−６−メチル−７−ブロモフルオラン、３−ジエチルアミノ−６−メチル−８−メチルフルオラン、３−ジエチルアミノ−７−クロロフルオランなどを挙げることができる。
【００２０】
また、ロイコ染料を発色させる顕色剤としては、ロイコ染料を発色させる電子受容性化合物を任意に使用することができ、単独の顕色剤または複数の顕色剤を組み合わせて使用することができる。このような顕色剤の例としては、安息香酸などの有機酸、サリチル酸亜鉛などの有機酸の金属塩系、ｐ−オクチルフェノールなどのフェノール系、４−４´チオビス（６−ターシャルブチル−２−メチルフェノール）などのチオフェノール系、Ｎ−Ｎ´−ジフェニルチオ尿素などのチオ尿素誘導体、３，３´−ジアリル−４，４´−ジヒドロキシジフェニルスルホンなどのジフェニルスルホン系などの顕色剤を挙げることができる。
【００２１】
結着剤としては、例えば、ポリビニルアルコール、変性ポリビニルアルコール、デンプン、変性デンプン、カゼイン、ゼラチン、にかわ、アラビアゴム、ポリアミド、ポリアクリルアミド、変性ポリアクリルアミド、ヒドロキシエチルセルロース、メチルセルロース、カルボキシメチルセルロース、ヒドロキシプロピルセルロース、ポリ酢酸ビニル、ポリアクリル酸エステル、スチレン−無水マレイン酸共重合体、イソブチレン−無水マレイン酸共重合体、ジイソブチレン−無水マレイン酸共重合体、酢酸ビニル−無水マレイン酸共重合体、メチルビニル−無水マレイン酸共重合体、イソプロピレン−無水マレイン酸共重合体、スチレン−ブタジエン共重合体、ポリ塩化ビニル、ポリ塩化ビニリデン、塩化ビニル−酢酸ビニル共重合体、ポリウレタン、ポリスチレン、ポリビニルピロリドン、アクリル酸エステル、アクリルニトリル、メチルビニルエーテルなどの水溶性樹脂またはエマルジョンの一種類または二種類以上を選択して使用することができる。
【００２２】
記録層２２の上には、記録層２２を保護するための保護層２４が形成されている。
【００２３】
保護層２４を形成する材料としては、結着剤に充填剤を添加し、必要に応じて、滑剤、架橋剤、分散剤、消泡剤、耐水化剤などの添加剤を添加したものが用いられる。保護層として上層と下層の２層を形成する場合、下層には、通常、充填剤を用いない。結着剤としては、たとえば、澱粉およびその誘導体、ヒドロキシメチルセルロース、ヒドロキシエチルセルロース、カルボキシメチルセルロース、メチルセルロース、エチルセルロースなどのセルロース誘導体、ポリビニルアルコール、ポリアクリル酸ソーダ、ポリビニルピロリドン、アクリルアミド・アクリル酸エステル共重合体、アクリルアミド・アクリル酸エステル・メタクリル酸共重合体、スチレン・無水マレイン酸共重合体アルカリ塩、イソブチル・無水マレイン酸共重合体アルカリ塩、ポリアクリルアミド、アルギン酸ソーダ、ゼラチン、カゼインなどの水溶性高分子を用いることができるが、より好ましくは、ポリ酢酸ビニル、ポリウレタン、ポリアクリル酸エステル、ポリメタアクリル酸エステル、塩化ビニル・酢酸ビニル共重合体、エチレン・酢酸ビニル共重合体、スチレン・ブタジエン共重合体、スチレン・ブタジエン・アクリル共重合体、スチレン・マレイン酸共重合体などの高分子エマルジョンが用いられる。
【００２４】
また、保護層２４を形成するための充填剤としては、たとえば、水酸化アルミニウム、酸化アルミニウム、ケイ酸アルミニウム、重質炭酸カルシウム、軽質炭酸カルシウム、酸化チタン、硫酸バリウム、シリカゲル、活性白土、タルク、クレー、カオリナイト、ケイソウ土、ホワイトカーボン、炭酸マグネシウム、酸化マグネシウム、水酸化マグネシウム、酸化亜鉛、ポリスチレン樹脂粒子、尿素−ホルマリン樹脂粒子、ポリオレフィン樹脂粒子などの中の１種類または２種類以上を選択して使用することができる。
なお、保護層２４において、記録層２２の印字とは異なる文字、図形等が印刷されていてもよい。
【００２５】
次に、前記実施の形態である貼替防止ラベルの製造方法の一例を説明する。
ラベル基材１４への中間層１６の積層は、ラベル基材１４の一方の表面（この表面を、以下、裏面と表示する）に、顔料を含有するポリオレフィン樹脂を押し出し、冷却ロール５０と圧着ロール５２との間で冷却圧着することによって行われる。
顔料を含有するポリオレフィン樹脂は、２７０〜３３０℃前後の温度に加熱し溶融され、押出機の出口側に接続されたＴダイ５４より、冷却ロール５０と圧着ロール５２に挟み込まれたラベル基材１４の裏面側に押し出され、冷却と同時にラベル基材１４の裏面に積層圧着される。
粘着剤層１８の形成は、剥離台紙２０の剥離処理面側に設けられた粘着剤層１８側とラベル基材１４に設けられた中間層１６とを積層することによって行われる。
この積層体のラベル基材１４と中間層１６と粘着剤層１８とを剥離台紙２０を残して各貼替防止ラベル１２の形状にダイカットする。
【００２６】
次いで、剥離台紙２０から、各貼替防止ラベル１２となる部分以外の不要な部分をラベル基材１４、中間層１６および粘着剤層１８ごと除去する。これにより、剥離台紙２０上には、複数の貼替防止ラベル１２が連続して仮着した貼替防止ラベル連続体１０を得ることができる。
【００２７】
なお、粘着剤層１８は剥離台紙２０に仮着され剥離台紙２０で覆われているので、長尺状のラベル基材１４を用いれば、それを巻回することにより巻回体状の貼替防止ラベル連続体１０が得られる。
【００２８】
【実施例】
▲１▼ 中間層１６を構成する顔料とポリオレフィン樹脂を含有する中間層材料の調整
顔料として炭酸カルシウム（平均粒径２．８μｍ）を８０重量パーセントと、ポリオレフィン樹脂としてリニア低密度ポリエチレン樹脂（Ｌ−ＬＤＰＥ）を２０重量パーセント含有する株式会社竹原化学工業製のマスタバッチＭＡＸ３０４−１８Ａと、低密度ポリエチレン樹脂（ＬＰＥＤ）とを、表１に示した顔料含有量となるように混合した中間層材料を準備した。なお、顔料含有量は、式１に基づく値である。
▲２▼ ラベル基材への中間層１６の形成
前記中間層材料を押出機に投入し、３１０℃に加熱溶融して、押出機に直結しているＴダイ５４から、溶融した中間層材料（顔料を含む溶融樹脂）を層状にラベル基材１４である秤量６４ｇ／ｍ^２の上質紙の裏面側に押し出し、そして、上質紙と中間層材料（顔料を含む溶融樹脂）が冷却ロール５０と圧着ロール５２の間を通され、冷却されながら積層圧着された。
▲３▼ ラベルの試作
剥離台紙２０として、剥離処理された側にアクリル系粘着剤２０ｇ／ｍ^２が形成された剥離台紙２０を準備した。この剥離台紙２０の粘着剤層１８側とラベル基材１４の中間層１６側とを積層して、剥離台紙２０上に粘着剤層１８、中間層１６、ラベル基材１４が順に積層された積層体を形成した。
積層体を形成した後、剥離台紙２０を残して各貼替防止ラベル１２の形状にダイカットした。
次いで、剥離台紙２０から、各貼替防止ラベル１２となる部分以外の不要な部分（粘着剤層１８、その上に形成されている中間層１６およびラベル基材１４）を剥離除去（いわゆるカス上げ）し、剥離台紙２０上に複数の貼替防止ラベル１２が連続して仮着した貼替防止ラベル連続体１０を得ることができた。
▲４▼ 評価
試作した貼替防止ラベル１２を剥離台紙２０から剥離して、被貼着物であるコートボール（塗工白板紙）製カートンに貼付した。貼付した後、手で、貼替防止ラベル１２をコートボール（塗工白板紙）製カートンから剥がし取る試験を行った。
その結果は、表１の結果の欄に示すとおりである。表１を見てもわかるとおり、中間層１６のμｍで表した厚さの平方根と中間層１６の顔料含有率との積Ｇを４０〜３００とすれば、ラベルを剥がし取ろうとすると、粘着剤層１８が被貼着物に残存し、ラベル基材１４に粘着剤層１８が伴わない状態で、ラベル基材１４が剥離される。更に確実に粘着剤層１８がラベル基材１４に残存しなかったＧの値の範囲は、５０〜２５０であった。
なお、中間層の接着強度及び凝集破壊強度は、中間層の厚さが厚くなる場合及び顔料含有量が増加する場合に弱くなる。試料２〜７において、剥れた面の顕微鏡観察から、試料２，３，４，６，７は層間剥離を主体とする剥がれでり、試料５は凝集破壊を主体とする剥がれであった。いずれも、ラベル基材１４を、ラベル基材１４に粘着剤層１８を伴うことなく剥がすことができた。また、試料２〜７において、カートンに残った粘着剤層１８は中間層１６で覆われており、べたべたと他物に貼りつくことがなかった。
【００２９】
【表１】

【００３０】
この発明は、例えば、次のように変更してもよい。
この貼替防止ラベル連続体１１０は、図５及び図６に示すように、複数の貼替防止ラベル１１２が帯状に連続して形成され、粘着剤層１１８を内側として巻回された巻回体状ノンセパ型のラベル連続体であり、粘着剤層１１８と接する側のラベル基材１１４の他方主面側、この例では、保護層１２４の上に、剥離層１２６が形成されている。
貼替防止ラベル連続体１１０は、貼替防止ラベル１１２として使用する前は、剥離層１２６側と粘着剤層１１８とが対向して仮着するように、ラベル基材１１４がロール状に巻き重ねられている。貼替防止ラベル１１２を使用する際には、貼替防止ラベル連続体１１０を巻き戻し、複数の貼替防止ラベル１１２のそれぞれの境界に形成されたミシン目１３０において切断して、各々１枚の貼替防止ラベル１１２として用いることができる。
貼替防止ラベル連続体１１０は、前記実施の形態と同様に中間層１１６、粘着剤層１１８、記録層１２２及び保護層１２４を備えており、中間層１１６はラベル基材１１４と粘着剤層１１８の間に形成されている。
【００３１】
剥離台紙に積層された粘着剤層を転移させることにより、粘着剤層１１８は、形成されている。
【００３２】
ラベル基材１１４の表面に、記録層１２２を透視可能な剥離層１２６が形成されるが、剥離層１２６は、貼替防止ラベル連続体１１０を巻き戻し可能に巻き重ねるためのものである。
ラベル基材１１４の表面に形成された剥離層１２６は、たとえばシリコーン樹脂などからなる剥離剤を印刷塗布した後、硬化させて形成される。この場合、記録層１２２（感熱発色層）に影響を及ぼさない温度で硬化させることができる材料が好ましく、たとえば、紫外線硬化型シリコーン樹脂や電子線硬化型シリコーン樹脂などが選択できる。
【００３３】
ラベル基材１４，１１４としては、前記例のほか、熱転写受容層、インクジェット記録層等の記録シート類などを用いてもよい。
【００３４】
【発明の効果】
この発明によれば、被貼着物から剥離されるときに、確実に貼替防止ラベルを構成するラベル基材が粘着剤を伴わずに被貼着物から剥離され、再度他の被貼着物に貼着する貼着機能が損なわれる、貼替防止ラベルおよび貼替防止ラベル連続体を得ることができる。
【図面の簡単な説明】
【図１】本発明にかかる貼替防止ラベル連続体の一実施の形態を示す斜視図である。
【図２】図１に示す貼替防止ラベルを被貼着物から剥離させた状態の一例を示す断面図である。
【図３】本発明にかかるラベルの一実施の形態たる貼替防止ラベルの製造に用いる製造装置の図解図である。
【図４】本発明にかかる貼替防止ラベル連続体の一実施の形態を示す斜視図解図である。
【図５】本発明にかかるラベルの他の実施の形態を示すラベル連続体の斜視図解図である。
【図６】図５Ａ−Ａ断面図解図である。
【符号の説明】
１０，１１０ 貼替防止ラベル連続体
１２，１１２ 貼替防止ラベル
１４，１１４ ラベル基材
１６，１１６ 中間層
１８，１１８ 粘着剤層
２０ 剥離台紙
２２，１２２ 記録層
２４，１２４ 保護層
１２６ 剥離層
１３０ ミシン目
５０ 冷却ロール
５２ 圧着ロール
５４ Ｔダイ[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an anti-replacement label and a continuation of anti-replacement label, in particular, for example, a continuation-proof label and a continuation of anti-replacement label that have been difficult to be peeled off from an adherend and attached to a different object. About.
[0002]
[Prior art]
2. Description of the Related Art In a retail store such as a store, a mass merchandise store, or a department store, an adhesive label printed with Arabic numerals, bar codes, or the like is attached to a product, and the price of the product is displayed. However, some buyers try to purchase a product at a price lower than a set price by removing the label attached to the product and attaching the label to another expensive product. Therefore, in order to prevent such an action from being performed, a label as disclosed in Patent Document 1 has been proposed.
The label 1 for preventing re-covering proposed in Patent Literature 1 is a label composed of a surface substrate 2, a pseudo adhesive layer 3, and an adhesive layer 4 in order from the front side of the label. The label 1 for preventing re-covering is configured such that the adhesive force between the surface substrate 2 and the pseudo adhesive layer 3 is smaller than the adhesive force between the pseudo adhesive layer 3 and the adhesive layer 4. The pseudo-adhesive layer 3 is made of a polyolefin resin and applied to the surface substrate 2 at a temperature lower than the normal lamination treatment temperature, thereby weakening the adhesive force to the surface substrate 2.
As a result, in the anti-replacement label 1, when the label is to be peeled off from the adherend, the adhesive layer 4 and the pseudo-adhesive layer 3 remain on the surface of the adherend, and only the surface substrate 2 is peeled off. Therefore, even if an attempt is made to affix the replacement label 1 to another product or the like, it cannot be affixed because the adhesive layer 4 is damaged.
[0003]
[Patent Document 1]
Japanese Utility Model Registration No. 3067674
[Problems to be solved by the invention]
However, it is difficult to reliably reduce the adhesive force between the surface substrate 2 and the pseudo-adhesive layer 3 from the adhesive force between the pseudo-adhesive layer 3 and the pressure-sensitive adhesive layer 4 in the label 1 for preventing refilling of Patent Document 1. Met. Therefore, in the label 1 for preventing refilling, the pseudo-adhesive layer 3 and the adhesive layer 4 may be peeled off together with the surface substrate 2, and the label 1 may be re-attached to a different product or the like.
[0005]
Therefore, a main object of the present invention is to ensure that, when peeled off from an adherend, the label substrate constituting the re-sticking prevention label is peeled off from the adherend without the use of an adhesive, and the other adhesive is again removed. An object of the present invention is to provide a sticking prevention label and a sticking prevention label continuum in which a sticking function for sticking to a sticking object is impaired.
[0006]
[Means for Solving the Problems]
The present inventors provide an intermediate layer containing a pigment and a polyolefin resin as main components between a label base material and an adhesive layer, and determine a product of a square root of the thickness of the intermediate layer and a pigment content by a specific amount. If it is controlled to be a value, when the label is to be peeled, the label is reliably peeled between the label substrate and the pressure-sensitive adhesive layer due to delamination between the label substrate and the intermediate layer and / or cohesive failure of the intermediate layer. The present invention has been completed based on the finding that the above conditions are satisfied.
That is, an anti-replacement label in which an intermediate layer and a pressure-sensitive adhesive layer are laminated in this order on the back surface of a label substrate, wherein the intermediate layer contains a pigment and a polyolefin resin as main components, and the thickness of the intermediate layer expressed in μm. If the product G of the square root of the height and the content of the pigment expressed in weight% is 40 or more and 300 or less, when the label is to be peeled off, delamination between the label base material and the intermediate layer and / or the intermediate layer The present inventors have conceived of an invention in which the cohesion and destruction of the adhesive ensure that the label is peeled off between the label substrate and the pressure-sensitive adhesive layer.
If the product G is out of this range, there is a possibility that the pressure-sensitive adhesive layer may be peeled off from the adherend when the label is to be peeled off. And the intermediate layer is liable to be brittle, and there is a concern that the production cost will increase. When the product G deviates to the smaller side, it becomes difficult to form the intermediate layer uniformly.
[0007]
[Action]
According to the present invention, when the label is to be peeled, the label is reliably peeled between the label substrate and the pressure-sensitive adhesive layer due to delamination between the label substrate and the intermediate layer and / or cohesive failure of the intermediate layer.
[0008]
The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments of the present invention with reference to the accompanying drawings.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a perspective view showing an embodiment of the continuous label replacement label according to the present invention. FIG. 2 is a cross-sectional view illustrating an example of a state in which the sticking prevention label illustrated in FIG. 1 is separated from an adherend.
[0010]
A continuous body 10 for anti-replacement label according to this embodiment is one in which a plurality of anti-replacement labels 12 are formed continuously on a release liner 20. Each sticking prevention label 12 is used as one sticking prevention label 12 by being peeled off from the peeling backing sheet (separator) 20 when sticking to the adherend.
[0011]
The replacement prevention label 12 has a label substrate 14. In this embodiment, as the label base material 14, for example, high quality paper, recycled paper, matte paper, oil resistant paper, coated paper, art paper, kraft paper, glassine paper, cas coated paper, resin impregnated paper, synthetic fiber paper, etc. Paper label base materials, films such as PET, polyvinyl chloride, polyvinylidene chloride, polypropylene, polyolefin, etc. are applicable, but are materials that can be cut by hand or a machine such as a cutter. It is desirable.
[0012]
An intermediate layer 16 is formed on one principal surface (hereinafter, referred to as a back surface) of the label substrate 14. The intermediate layer 16 contains a polyolefin resin and a pigment as main components, melts the material, extrudes the material onto the surface of the label base 14, cools the space between the cooling roll 50 and the pressure roll 52, and It is formed by pressure bonding to the surface.
The polyolefin resin containing the pigment is melted at a temperature about 10 ° C. to 50 ° C. lower than the normal lamination temperature, for example, in the case of polyethylene resin at 270 ° C. to 330 ° C., and the T-die 54 connected to the extruder is melted. As a result, it is extruded toward the back side of the label base material 14 in the vicinity of being sandwiched between the cooling roll 50 and the pressure roll 52.
[0013]
In the present embodiment, as the polyolefin resin, an olefin-based polymer such as polyethylene, polypropylene, polybutene, and polystyrene, or a copolymer thereof, or a mixture of one or more of these is used. Not something.
[0014]
Examples of the pigment include, but are not limited to, calcium carbonate, titanium oxide, silica, alumina, talc, barium sulfate, aluminum hydroxide, bentonite, and red iron oxide.
The particle size of the pigment is not particularly limited, but is preferably 0.1 to 15 μm, more preferably 0.5 to 10 μm, and the particle size is smaller than the thickness of the film formed as the intermediate layer 16. It is desirable.
[0015]
If the thickness of the intermediate layer 16 is too small, it is difficult to form a film. Conversely, if the thickness is too large, the material cost increases and the cost increases. For this reason, the thickness of the intermediate layer 16 is not particularly limited, but is usually preferably 5 to 100 μm, and more preferably about 10 to 50 μm.
[0016]
On the other hand, if the content of the pigment is too small, delamination between the label substrate 14 and the intermediate layer 16 and cohesive failure of the intermediate layer 16 do not easily occur. May not be able to exist stably. From this, the content of the pigment in the intermediate layer 16 is preferably 15 to 70% by weight, more preferably 20 to 70% by weight of the weight of the pigment with respect to the sum of the weight of the pigment and the weight of the polyolefin resin (formula 1). 50 weight percent.

[0017]
An adhesive layer 18 is formed on the intermediate layer 16 (the main surface on the side opposite to the label substrate 14).
As the pressure-sensitive adhesive, known pressure-sensitive adhesives such as an acrylic pressure-sensitive adhesive, a natural rubber-based pressure-sensitive adhesive, and a synthetic rubber-based pressure-sensitive adhesive are used, but are not limited thereto.
The thickness of the pressure-sensitive adhesive layer 18 is not particularly limited, but is usually 7 to 60 μm, preferably about 10 to 35 μm.
[0018]
A recording layer 22 is formed on the label substrate 14 (the main surface on the opposite side to the surface on which the intermediate layer 16 is formed). In this embodiment, a thermosensitive coloring layer is formed on the surface of the label substrate 14 as the recording layer 22.
This thermosensitive coloring layer can be colored by heating it with a thermal head of a printer or the like.
The thermosensitive coloring layer is formed, for example, by applying and drying a thermosensitive coloring agent containing a mixture of a leuco dye, a developer and a binder.
[0019]
In this case, as the leuco dye, a dye applicable to this type of thermosensitive coloring agent can be arbitrarily selected, and may be used alone or in combination of two or more. As examples of such leuco dyes, for example, leuco compounds such as fluoran, trianylmethane, triphenylmethane, thiazine, spiropyran, lactam, auramine and indolinophthalide are preferably used. Among them, a fluoran leuco compound is particularly preferable as a leuco dye because a single compound can form black color and has good image stability as compared with other compounds.
Specific examples of leuco dyes include, for example, 3- (N-isopentyl-N-ethyl) amino-6-methyl-7-o-chloroanilinofluoran, 3-dipentylamino-6-methyl-7-anilino Fluoran, 3-diethylamino-6-methyl-7-p-toluidinofluoran, crystal violet lactone, 3- (N-ethyl-N-isopentyl) amino-6-methyl-7-anilinofluoran, 3 -Diethylamino-6-methyl-7-anilinofluoran, 3- (N-ethyl-p-toluidino) -6-methyl-7-anilinofluoran, 3-pyrrolidino-6-methyl-7-anilinofur Oran, 3-di (n-butyl) amino-6-methyl-7-anilinofluoran, 3- (N-cyclohexyl-N-methyl) amino-6-methyl-7- Nilinofluoran, 3-diethylamino-7- (o-chloroanilino) fluoran, 3-dibutylamino-7- (o-chloroanilino) fluoran, 3-diethylamino-7- (m-trifluoromethylanilino) fluoran, 3-dimethylamino -5-methyl-7-methylfluoran, 3- (N-methyl-NN-propyl) amino-6-methyl-7-anilinofluoran, 3- (N-isobutyl-N-ethyl) amino- 6-methyl-7-anilinofluoran, 3- (N-ethoxypropyl-N-ethyl) amino-6-methyl-7-anilinofluoran, 3-dibutylamino-6-methyl-7-bromofluoran , 3-diethylamino-6-methyl-8-methylfluoran, 3-diethylamino-7-chlorofluoran and the like. It can be.
[0020]
Further, as a developer for developing a leuco dye, an electron-accepting compound for developing a leuco dye can be used arbitrarily, and a single developer or a combination of a plurality of developers can be used. . Examples of such a color developer include organic acids such as benzoic acid, metal salts of organic acids such as zinc salicylate, phenols such as p-octylphenol, and 4-4′thiobis (6-tert-butyl-2). -Methylphenol), a thiourea derivative such as N-N'-diphenylthiourea, and a diphenylsulfone-based developer such as 3,3'-diallyl-4,4'-dihydroxydiphenylsulfone. Can be mentioned.
[0021]
As the binder, for example, polyvinyl alcohol, modified polyvinyl alcohol, starch, modified starch, casein, gelatin, glue, gum arabic, polyamide, polyacrylamide, modified polyacrylamide, hydroxyethyl cellulose, methyl cellulose, carboxymethyl cellulose, hydroxypropyl cellulose, Polyvinyl acetate, polyacrylate, styrene-maleic anhydride copolymer, isobutylene-maleic anhydride copolymer, diisobutylene-maleic anhydride copolymer, vinyl acetate-maleic anhydride copolymer, methyl vinyl- Maleic anhydride copolymer, isopropylene-maleic anhydride copolymer, styrene-butadiene copolymer, polyvinyl chloride, polyvinylidene chloride, vinyl chloride-vinyl acetate copolymer, poly Urethane, polystyrene, polyvinyl pyrrolidone, acrylic acid esters, acrylonitrile, can be used to select more than one kind or two kinds of water-soluble resin or emulsion, such as methyl vinyl ether.
[0022]
On the recording layer 22, a protective layer 24 for protecting the recording layer 22 is formed.
[0023]
As a material for forming the protective layer 24, a material obtained by adding a filler to a binder and, if necessary, adding additives such as a lubricant, a cross-linking agent, a dispersant, an antifoaming agent, and a waterproofing agent is used. Can be When forming two layers of an upper layer and a lower layer as a protective layer, a filler is not usually used for the lower layer. Examples of the binder include starch and derivatives thereof, hydroxymethyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose, methyl cellulose, cellulose derivatives such as ethyl cellulose, polyvinyl alcohol, sodium polyacrylate, polyvinyl pyrrolidone, acrylamide / acrylate copolymer, Water-soluble polymers such as acrylamide / acrylic acid ester / methacrylic acid copolymer, styrene / maleic anhydride copolymer alkali salt, isobutyl / maleic anhydride copolymer alkali salt, polyacrylamide, sodium alginate, gelatin and casein Although it can be used, more preferably, polyvinyl acetate, polyurethane, polyacrylate, polymethacrylate, vinyl chloride / vinyl acetate Polymers, ethylene-vinyl acetate copolymer, a styrene-butadiene copolymer, a styrene-butadiene-acrylic copolymer, polymer emulsions such as styrene-maleic acid copolymer.
[0024]
Examples of the filler for forming the protective layer 24 include aluminum hydroxide, aluminum oxide, aluminum silicate, heavy calcium carbonate, light calcium carbonate, titanium oxide, barium sulfate, silica gel, activated clay, talc, and the like. Select one or more of clay, kaolinite, diatomaceous earth, white carbon, magnesium carbonate, magnesium oxide, magnesium hydroxide, zinc oxide, polystyrene resin particles, urea-formalin resin particles, polyolefin resin particles, etc. Can be used.
It should be noted that characters, graphics, and the like different from those printed on the recording layer 22 may be printed on the protective layer 24.
[0025]
Next, an example of a method for manufacturing the re-sticking prevention label according to the embodiment will be described.
The lamination of the intermediate layer 16 on the label substrate 14 is performed by extruding a pigment-containing polyolefin resin on one surface of the label substrate 14 (this surface is hereinafter referred to as a back surface), 52 by cooling and pressing.
The pigment-containing polyolefin resin is heated and melted at a temperature of about 270 to 330 ° C., and the label substrate 14 sandwiched between the cooling roll 50 and the pressure roll 52 from the T-die 54 connected to the outlet side of the extruder. And is laminated and pressed on the back surface of the label substrate 14 simultaneously with cooling.
The formation of the pressure-sensitive adhesive layer 18 is performed by laminating the pressure-sensitive adhesive layer 18 provided on the release-treated surface of the release liner 20 and the intermediate layer 16 provided on the label substrate 14.
The label substrate 14, the intermediate layer 16 and the pressure-sensitive adhesive layer 18 of the laminate are die-cut into the shapes of the re-sticking prevention labels 12 while leaving the release liner 20.
[0026]
Next, unnecessary portions other than the portions that become the re-sticking prevention labels 12 are removed together with the label base 14, the intermediate layer 16, and the adhesive layer 18 from the release liner 20. In this way, it is possible to obtain the continuous body 10 of the sticking prevention label on which the plurality of sticking prevention labels 12 are successively temporarily attached on the peeling backing sheet 20.
[0027]
Since the pressure-sensitive adhesive layer 18 is temporarily attached to the release liner 20 and is covered with the release liner 20, if the long label base material 14 is used, it can be wound into a roll to be re-sealed. A continuation of prevention label 10 is obtained.
[0028]
【Example】
{Circle around (1)} 80% by weight of calcium carbonate (average particle size: 2.8 μm) as an adjusting pigment for the intermediate layer material containing the pigment constituting the intermediate layer 16 and the polyolefin resin, and a linear low density polyethylene resin (L- An intermediate layer material obtained by mixing a master batch MAX304-18A manufactured by Takehara Chemical Industry Co., Ltd. containing 20% by weight of (LDPE) and low-density polyethylene resin (LPED) so as to have a pigment content shown in Table 1. Got ready. The pigment content is a value based on the formula 1.
{Circle around (2)} Formation of Intermediate Layer 16 on Label Substrate The intermediate layer material is charged into an extruder, heated and melted at 310 ° C., and melted through a T-die 54 directly connected to the extruder to form a molten intermediate layer material ( The molten resin containing the pigment is extruded in a layered manner on the back side of the high-quality paper weighing 64 g / m ² , which is the label substrate 14, and the high-quality paper and the intermediate layer material (the molten resin containing the pigment) are pressed against the cooling roll 50. The sheet was passed between the rolls 52 and laminated and pressed while being cooled.
{Circle around (3)} As a prototype peeling backing sheet 20 for the label, a peeling backing sheet 20 having an acrylic pressure-sensitive adhesive 20 g / m ² formed on the side subjected to the peeling treatment was prepared. A laminate in which the adhesive layer 18 side of the release liner 20 and the intermediate layer 16 side of the label substrate 14 are laminated, and the adhesive layer 18, the intermediate layer 16, and the label substrate 14 are laminated on the release liner 20 in this order. Formed body.
After forming the laminate, the laminate was die-cut into the shape of each anti-replacement label 12, leaving the release liner 20.
Next, unnecessary portions (the pressure-sensitive adhesive layer 18, the intermediate layer 16 and the label base material 14 formed thereon) other than the portions that become the re-sticking prevention labels 12 are peeled and removed from the peeling backing sheet 20 (so-called scrap raising). Then, a continuous replacement prevention label body 10 in which a plurality of replacement prevention labels 12 were temporarily attached on the release mount 20 continuously was obtained.
{Circle around (4)} The peeling prevention label 12 produced for the evaluation trial was peeled from the peeling backing sheet 20, and attached to a carton made of a coated ball (coated white paperboard) as an adherend. After sticking, a test was conducted in which the sticking prevention label 12 was manually peeled off from a carton made of a coated ball (coated white paperboard).
The results are as shown in the column of results in Table 1. As can be seen from Table 1, if the product G of the square root of the thickness of the intermediate layer 16 expressed in μm and the pigment content of the intermediate layer 16 is 40 to 300, when the label is to be peeled off, an adhesive is used. The label substrate 14 is peeled off in a state where the layer 18 remains on the adherend and the pressure-sensitive adhesive layer 18 does not accompany the label substrate 14. Further, the range of the value of G where the pressure-sensitive adhesive layer 18 did not remain on the label base material 14 was 50 to 250.
In addition, the adhesive strength and cohesive failure strength of the intermediate layer become weaker when the thickness of the intermediate layer increases and when the pigment content increases. From the microscopic observation of the peeled surfaces of Samples 2 to 7, Samples 2, 3, 4, 6, and 7 were peeled mainly due to delamination, and Sample 5 was peeled mainly due to cohesive failure. In each case, the label substrate 14 could be peeled off without attaching the pressure-sensitive adhesive layer 18 to the label substrate 14. Further, in Samples 2 to 7, the pressure-sensitive adhesive layer 18 remaining in the carton was covered with the intermediate layer 16, and did not stick to other objects.
[0029]
[Table 1]

[0030]
The present invention may be modified as follows, for example.
As shown in FIGS. 5 and 6, the continuous body 110 for replacement labels has a plurality of replacement labels 112 formed continuously in a strip shape and wound with the adhesive layer 118 inside. A release layer 126 is formed on the other main surface side of the label substrate 114 on the side in contact with the pressure-sensitive adhesive layer 118, in this example, on the protective layer 124, which is a non-separated label continuous body.
Before use as the re-sticking prevention label 112, the label replacement substrate 114 is wound in a roll shape so that the release layer 126 side and the pressure-sensitive adhesive layer 118 face and temporarily adhere to each other. Have been. When using the replacement prevention label 112, the continuous replacement prevention label 110 is rewound, cut at the perforations 130 formed at the respective boundaries of the plurality of replacement prevention labels 112, and each of the single replacement prevention labels 112 is cut. It can be used as a replacement prevention label 112.
The continuous label replacement label 110 includes an intermediate layer 116, an adhesive layer 118, a recording layer 122, and a protective layer 124, as in the above-described embodiment. The intermediate layer 116 includes a label base 114 and an adhesive layer 118. Is formed between.
[0031]
The adhesive layer 118 is formed by transferring the adhesive layer laminated on the release liner.
[0032]
A release layer 126 that allows the recording layer 122 to be seen through is formed on the surface of the label substrate 114. The release layer 126 is used to rewind the continuous label-prevention label continuous body 110 in a rewindable manner.
The release layer 126 formed on the surface of the label substrate 114 is formed by printing and applying a release agent made of, for example, a silicone resin and then curing the release agent. In this case, a material that can be cured at a temperature that does not affect the recording layer 122 (thermosensitive coloring layer) is preferable. For example, an ultraviolet curable silicone resin or an electron beam curable silicone resin can be selected.
[0033]
As the label bases 14 and 114, in addition to the above examples, recording sheets such as a thermal transfer receiving layer and an ink jet recording layer may be used.
[0034]
【The invention's effect】
According to the present invention, when peeled from the adherend, the label substrate constituting the anti-replacement label is reliably peeled off from the adherend without the use of an adhesive, and is again adhered to another adherend. A sticking prevention label and a sticking prevention label continuum in which the sticking function to be worn is impaired can be obtained.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a continuous label replacement label according to the present invention.
FIG. 2 is a cross-sectional view showing an example of a state in which the sticking prevention label shown in FIG. 1 is peeled off from an adherend.
FIG. 3 is an illustrative view of a manufacturing apparatus used for manufacturing a sticking prevention label as one embodiment of the label according to the present invention;
FIG. 4 is an exploded perspective view showing one embodiment of the continuous label replacement label body according to the present invention.
FIG. 5 is a schematic perspective view of a continuous label body showing another embodiment of the label according to the present invention.
FIG. 6 is an illustrative view in section in FIG. 5A-A.
[Explanation of symbols]
10, 110 anti-replacement label continuum 12, 112 anti-replacement label 14, 114 label base 16, 116 intermediate layer 18, 118 adhesive layer 20 release mount 22, 122 recording layer 24, 124 protective layer 126 release layer 130 Perforation 50 Cooling roll 52 Crimping roll 54 T-die

Claims (3)

A label substrate,
An intermediate layer formed on one main surface of the label substrate,
It is a sticking prevention label consisting of an adhesive layer formed on the intermediate layer,
The intermediate layer has a pigment and a polyolefin resin as main components,
An anti-replacement label, wherein a product of a square root of a thickness value of the intermediate layer expressed in μm and a weight percent value of a pigment content is 40 or more and 300 or less. A label substrate, an intermediate layer formed on one main surface of the label substrate, and an anti-replacement label comprising an adhesive layer formed on the intermediate layer are temporarily and continuously provided on a release liner. Dressed,
The intermediate layer has a pigment and a polyolefin resin as main components,
A continuous label for preventing re-sticking, wherein a product of a square root of a thickness value of the intermediate layer expressed in μm and a value of a weight percentage of a pigment content is 40 to 300. Continuous label base material, an intermediate layer formed on one main surface of the label base material, an adhesive layer formed on the intermediate layer, and the label base material on the side in contact with the adhesive layer. A continuous body of a re-sticking prevention label consisting of a release layer formed on the other main surface side,
The intermediate layer has a pigment and a polyolefin resin as main components,
A continuous label for preventing re-sticking, wherein a product of a square root of a thickness value of the intermediate layer expressed in μm and a value of a weight percentage of a pigment content is 40 to 300.

Images