JP2005120184A - Removable pressure-sensitive adhesive label and manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a removable pressure-sensitive adhesive label which, obtained by using a hot melt adhesive that enables to conduct the coating of the adhesive even for a small lot of a label base material with small and inexpensive equipment and using fine spheres having stickiness, allows gluing to and removing from an adherend to be repeated, and to provide its manufacturing method. <P>SOLUTION: The removable pressure-sensitive adhesive label 10 is composed of the label base material 1, the hot melt adhesive layer 2, and the fine spheres adhesive layer 3. On one surface of the label base material 1 the hot melt adhesive layer 2 is formed and on this layer 2 there is formed the fine spheres adhesive layer 3 which has the fine spheres having stickiness dispersed therein. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a releasable pressure-sensitive adhesive label and a method for producing the same, which can be repeatedly applied to and peeled off from an adherend using a hot melt pressure-sensitive adhesive and an adhesive microsphere. It is.

    Conventionally, the pressure-sensitive adhesives used for pressure-sensitive adhesive labels are classified according to their types, such as rubber-based pressure-sensitive adhesives, acrylic pressure-sensitive adhesives, and silicone-based pressure-sensitive adhesives. Furthermore, these pressure-sensitive adhesives are classified according to their forms. Emulsion-type pressure-sensitive adhesives that are polymerized with resin fine particles in water, solvent-type pressure-sensitive adhesives that use organic solvents, and usually hot that are melted by heat. There are melt-type adhesives. Specifically, an acrylic emulsion-type adhesive that is a mixture of the acrylic adhesive and water, an acrylic solvent-type adhesive that is a mixture of the acrylic adhesive and an organic solvent, and the rubber-based adhesive. There are solidified rubber-based hot-melt adhesives.

    The above-mentioned emulsion type adhesive and solvent type adhesive can be applied to a label substrate by a general coating machine such as a roll coater, a gravure coater, a die coater, etc. Drying equipment for drying moisture in the above-mentioned agent and organic solvent in the above-mentioned solvent-type pressure-sensitive adhesive is indispensable, which increases the size and cost of the coating machine. There was a problem that the agent could not be applied to a small-lot label substrate. On the other hand, the hot-melt type adhesive can be applied by a hot-melt type adhesive application machine such as an extrusion nozzle coater, and water and organic solvents such as the above-mentioned emulsion-type adhesive and solvent-type adhesive. Therefore, no drying equipment is required, and it is suitable for applying an adhesive to a small-lot label substrate.

    In addition, if the adhesive labels are classified according to their use, the permanent adhesive type that will not be peeled off after being attached to the adherend, and the re-adhesion that can be repeatedly applied to and peeled off from the adherend. There is a peeling type. The re-peeling type that can be repeatedly applied to and peeled off from the adherend is one in which a microsphere having adhesiveness is applied to a label substrate to provide a microsphere adhesive layer. . Such microspheres having adhesiveness can be mixed and dispersed in an emulsion-type adhesive and a solvent-type adhesive. However, in the hot melt type adhesive, the viscosity of the hot melt type adhesive melted by one heat is high and the viscosity of the microsphere having the other adhesive is low. And cannot be uniformly dispersed. In addition, the difference in specific gravity between the hot melt adhesive and the microsphere having adhesiveness cannot be mixed and dispersed uniformly. Accordingly, there is a problem that there is no re-peeling type in which the hot-melt type pressure-sensitive adhesive can be repeatedly applied to and peeled off from the adherend.

JP-A-9-106249

    The present invention has been considered in view of the above problems, and uses a hot-melt type pressure-sensitive adhesive capable of applying a pressure-sensitive adhesive even to a small-lot label substrate with small and inexpensive equipment, and It is an object of the present invention to provide a releasable pressure-sensitive adhesive label and a method for producing the same, which can be repeatedly attached and peeled to an adherend using an adhesive microsphere.

In order to solve the above problems, the present invention has the following configuration.
The gist of the invention described in claim 1 is a microsphere in which a hot melt pressure-sensitive adhesive layer is formed on one surface of a base material, and adhesive microspheres are dispersed on the hot melt pressure-sensitive adhesive layer. The present invention relates to a releasable pressure-sensitive adhesive label in which a pressure-sensitive adhesive layer is formed.
The gist of the invention of claim 2 is that the hot-melt pressure-sensitive adhesive layer has a thickness of 5 to 40 μm, and the average particle diameter of the adhesive microspheres of the microsphere adhesive layer is 10 to 80 μm. The releasable pressure-sensitive adhesive label according to claim 1, comprising:
The gist of the invention of claim 3 is that a release agent layer is formed on the other surface of the base material, and the release agent layer and adhesive microspheres are dispersed on the hot-melt adhesive layer. The releasable pressure-sensitive adhesive label according to claim 1, wherein the fine spherical pressure-sensitive adhesive layer provided in contact with each other is formed in a roll shape.
According to a fourth aspect of the present invention, a hot melt pressure-sensitive adhesive is applied to one surface of a substrate to form a hot melt pressure-sensitive adhesive layer, and the hot melt pressure-sensitive adhesive layer has an adhesive property. The present invention relates to a method for producing a releasable pressure-sensitive adhesive label, wherein a microsphere adhesive layer is formed by coating a microsphere adhesive provided by dispersing dispersed microspheres.
The gist of the invention of claim 5 is that a release agent is applied to the other surface of the substrate to form a release agent layer, and the release agent layer and the microsphere adhesive layer are brought into contact with each other. It is formed in roll shape, It is related with the manufacturing method of the releasable adhesive label of Claim 4.

In the present invention, a hot melt pressure-sensitive adhesive layer is formed on one surface of a substrate, and a microsphere pressure-sensitive adhesive layer in which adhesive microspheres are dispersed on the hot-melt pressure-sensitive adhesive layer is formed. Since it was made to do, the releasable adhesive label which enabled it to perform sticking and peeling to a to-be-adhered body repeatedly can be obtained.
In addition, since a hot melt adhesive layer was formed on one surface of the substrate using a hot melt adhesive coating machine, and a microsphere adhesive layer was formed on the hot melt adhesive layer, A re-peelable pressure-sensitive adhesive label that can be repeatedly applied to and peeled off from an adherend can be easily produced even in a small lot using small and inexpensive equipment.

  Next, the releasable pressure-sensitive adhesive label and the method for producing the same according to the present invention will be described with reference to FIGS. FIG. 1 is a schematic sectional view of a releasable pressure-sensitive adhesive label according to the present invention. FIG. 2 is a schematic view of a releasable pressure-sensitive adhesive label manufacturing apparatus with release paper according to the present invention. 3 is a schematic cross-sectional view taken along line AA in FIG. FIG. 4 is a schematic view of a releasable pressure-sensitive adhesive label manufacturing apparatus according to the present invention. FIG. 5 is a schematic sectional view taken along line BB in FIG.

  First, the releasable pressure-sensitive adhesive label according to the present invention shown in FIG. 1 will be described. The releasable pressure-sensitive adhesive label 10 is composed of a label base material 1, a hot-melt pressure-sensitive adhesive layer 2, and a microsphere pressure-sensitive adhesive layer 3. A hot-melt pressure-sensitive adhesive layer is formed on one surface of the label base material 1. 2 is formed, and on this hot melt pressure-sensitive adhesive layer 2, a fine sphere pressure-sensitive adhesive layer 3 in which fine spheres having adhesive properties are dispersed is formed.

  As the label substrate 1, for example, paper, a synthetic resin film, a laminate or a composite material thereof can be used, and thermal paper using a paper or a synthetic resin film as a base may be used. Further, the thickness of the label substrate 1 is not particularly limited.

    The hot melt pressure-sensitive adhesive layer 2 is, for example, coated with a rubber hot melt pressure-sensitive adhesive composed of a rubber block polymer, an acrylic hot melt pressure-sensitive adhesive composed of an acrylic resin, and the like. The thickness of the layer is about 5 to 40 μm.

    The microsphere pressure-sensitive adhesive layer 3 is, for example, a so-called acrylic acid ester monomer such as 2-ethylhexyl acrylate or butyl acrylate, or various ionic monomers polymerized in water in the presence of an oil-soluble catalyst. A sphere or the like is used, and in order to improve the coating property by adjusting the viscosity at the time of coating, a general acrylic emulsion type pressure-sensitive adhesive or the like is mixed to produce a microsphere pressure-sensitive adhesive. The microsphere pressure-sensitive adhesive layer 3 is a pressure-sensitive adhesive layer having removability that can be repeatedly applied to and peeled off from the adherend.

    The average particle diameter of the adhesive microspheres constituting the microsphere adhesive and the general acrylic emulsion-type adhesive is about 10 to 80 μm for the adhesive microspheres. A typical acrylic emulsion-type pressure-sensitive adhesive is 1 μm or less. The mixing ratio between the adhesive microsphere and the general acrylic emulsion-type adhesive is such that the adhesive microsphere is about 70 to 100% by weight, and the general acrylic emulsion The mold pressure-sensitive adhesive is about 0 to 30% by weight. Furthermore, the thickness of the microsphere pressure-sensitive adhesive layer 3 is about 10 to 80 μm, which is substantially the same as the average particle diameter of the adhesive microspheres.

  In order that the releasable pressure-sensitive adhesive label 10 can be repeatedly applied to and peeled off from the adherend, the microsphere pressure-sensitive adhesive layer 3 is formed on the hot-melt pressure-sensitive adhesive layer 2. It is necessary that the microsphere pressure-sensitive adhesive layer 3 is always adhered to the adherend in a state where it is exposed.

  In the releasable pressure-sensitive adhesive label 10 shown in FIG. 1, since the microsphere pressure-sensitive adhesive layer 3 is formed on the hot melt pressure-sensitive adhesive layer 2, the microsphere pressure-sensitive adhesive layer 3 is exposed, and the removable pressure-sensitive adhesive layer 10 is exposed. When the label 10 is pressed against an adherend (not shown), the fine spherical adhesive layer 3 is attached in contact with the adherend. Further, when the releasable pressure-sensitive adhesive label 10 is peeled off from an adherend (not shown), the fine ball adhesive layer 3 is peeled off from the adherend.

  In such a releasable label 10, when the size of the microsphere having the adhesiveness of the microsphere adhesive layer 3 is smaller than the thickness of the hot melt adhesive layer 2, the microspheres are hot melted. It is buried in the mold pressure-sensitive adhesive layer 2 and cannot exhibit the removability of the microsphere. Therefore, in order to exhibit re-peelability that can be repeatedly applied to and peeled off from the adherend, a microsphere having the adhesiveness of the microsphere adhesive layer 3 rather than the hot-melt adhesive layer 2 is used. It needs to be large and always exposed.

  By the way, the hot-melt pressure-sensitive adhesive layer 2 is a binder (bonding agent) for fixing the microsphere pressure-sensitive adhesive layer 3 to the label substrate 1. For example, even if the microsphere pressure-sensitive adhesive layer 3 is directly formed on one surface of the label base material 1, the adhesiveness of the microspheres having adhesiveness is weak, and it is difficult to fix to the label base material 1. . Moreover, when it adheres to a to-be-adhered body, the microsphere which has adhesiveness will transfer to an to-be-adhered body, and it cannot repeat and stick to an adherend and peeling. That is, by forming the microsphere adhesive layer 3 on the hot melt adhesive layer 2, the hot melt adhesive layer 2 fixes the microsphere adhesive layer 3 to the label substrate 1 ( Since the microspheres having adhesiveness are fixed to the label substrate 1, the sticking to the adherend and the peeling can be repeated.

  Next, the manufacturing method of the releasable adhesive label with a release paper concerning this invention is demonstrated. FIG. 2 is a schematic view of a releasable pressure-sensitive adhesive label manufacturing apparatus with release paper according to the present invention.

  A hot melt coater 30 which is a releasable pressure-sensitive adhesive label manufacturing apparatus with release paper according to the present invention is loaded with a long label substrate 1 wound in a roll shape on a first supply unit 31, and this first supply. The label base material 1 fed out from the part 31 is coated on one surface with a hot-melt adhesive by the first coating part 32 and with a microsphere adhesive by the second coating part 33, A peelable adhesive label 10 is formed. Further, the long release paper 4 wound in a roll shape is loaded on the second supply unit 34, and the release-treated surface of the release paper 4 fed from the second supply unit 34 and the releasable adhesive label Ten microsphere pressure-sensitive adhesive layers 3 are bonded together by a nip roll 35 and wound up in a roll shape by a winding unit 36.

  A hot melt applicator (not shown) is installed in the vicinity of the first coating portion 32 of the hot melt coater 30. In the hot melt applicator, the solid hot melt adhesive is heated and melted, and the melted hot melt adhesive is supplied to a heat insulating tank (not shown) in the first coating unit 32. The melted hot-melt pressure-sensitive adhesive in the heat insulation tank is applied to one surface of the label substrate 1 by an unillustrated extrusion nozzle portion in the first coating portion 32.

  In addition to the extrusion nozzle method, the melted hot-melt pressure-sensitive adhesive is coated on the entire concave gravure roll and then melted excessively on the doctor plate. A gravure method may be used in which the hot-melt type pressure-sensitive adhesive is scraped off and the molten hot-melt type pressure-sensitive adhesive remaining in the concave depression is applied.

    In the second coating unit 33, a fine sphere adhesive in which an adhesive microsphere and a general acrylic emulsion-type adhesive are mixed is applied. As a coating method of the fine sphere adhesive, Coating is performed by the above-described extrusion nozzle method, gravure method, roll coater method in which an adhesive is applied by a roll coater having a coating roll and a backup roll.

  As described above, since the general acrylic emulsion-type pressure-sensitive adhesive contains water as described above, the fine sphere pressure-sensitive adhesive applied in the second coating portion 33 must be removed by drying. . However, the proportion of moisture in the entire microsphere adhesive is very small, and it is as large as a conventional coating machine such as a conventional roll coater, gravure coater, die coater to dry and remove this moisture. Does not require any drying equipment. As a device for drying and removing the moisture, a small hot air blower that generates a required amount of heat and can be moved arbitrarily is sufficient, and the ultraviolet curing device can also dry and remove even the heat generated during ultraviolet irradiation. .

  3 is a schematic cross-sectional view taken along line AA in FIG. As described above, it is a schematic cross-sectional view of the releasable pressure-sensitive adhesive label 10 with the release paper 4 in which the release-treated surface of the release paper 4 and the microsphere pressure-sensitive adhesive layer 3 of the releasable pressure-sensitive adhesive label 10 are bonded together. The release paper 4 is provided to protect the microspherical pressure-sensitive adhesive layer 3 of the releasable pressure-sensitive adhesive label 10 and to remove the release paper 4 and stick it to an adherend when necessary. The release paper 4 is made of kraft paper or glassine paper, and is provided with a release agent layer on one side in contact with the pressure-sensitive adhesive for release treatment. As this release agent layer, silicone is mainly used.

  The releasable pressure-sensitive adhesive label 10 with the release paper 4 manufactured in this way is subjected to various displays and designs on the surface of the label substrate 1 (the surface to which the pressure-sensitive adhesive is not applied) by a general label printer or the like. Printing can be performed or die-cut into a predetermined shape.

  Next, a releasable pressure-sensitive adhesive label without a release paper that does not use the release paper 4 described above will be described. Compared with the releasable pressure-sensitive adhesive label manufacturing apparatus with release paper shown in FIG. 2, the releasable pressure-sensitive adhesive label manufacturing apparatus without release paper according to the present invention shown in FIG. The supply part 34 is not required. Therefore, the removable adhesive label manufacturing apparatus with release paper shown in FIG. 2 can be used as it is.

  A hot melt coater 30 shown in FIG. 4 is loaded with a long label base material 1 wound in a roll shape on a first supply unit 31, and the surface of the label base material 1 (surface on which an adhesive is not applied). The release agent layer 5 to which a release agent is applied in advance is formed. The label base material 1 fed out from the first supply unit 31 is coated with a hot-melt adhesive on the back surface (the surface on which the adhesive is applied) by the first coating unit 32, and the second coating unit. A microsphere adhesive is applied by 33 to form a releasable pressure-sensitive adhesive label 20 without release paper, and is wound up in a roll shape by a winding unit 36.

  FIG. 5 is a schematic sectional view taken along line BB in FIG. It is a schematic sectional drawing of the releasable adhesive label 20 without release paper mentioned above. Silicone is mainly used as the release agent for forming the release agent layer 5. In order to perform printing such as various indications and designs on the releasable pressure-sensitive adhesive label 20 without release paper, various indications and designs are appropriately applied to the surface of the label substrate 1 (the surface on which the adhesive is not applied). After forming the printing layer subjected to the printing, the release agent layer 5 may be formed on the printing layer.

  The releasable pressure-sensitive adhesive label 20 without release paper produced as described above is wound in a roll shape so that the release agent layer 5 and the microsphere pressure-sensitive adhesive layer 3 are in contact with each other, and is appropriately pulled out from the roll and covered. Can be attached to the body.

  As described above, the present invention provides a microsphere pressure-sensitive adhesive in which a hot melt pressure-sensitive adhesive layer is formed on one surface of a base material, and adhesive microspheres are dispersed on the hot-melt pressure-sensitive adhesive layer. Since the layer is formed, it is possible to obtain a releasable pressure-sensitive adhesive label that can be repeatedly stuck to and peeled off from the adherend. In addition, since a hot melt adhesive layer was formed on one surface of the substrate using a hot melt adhesive coating machine, and a microsphere adhesive layer was formed on the hot melt adhesive layer, A re-peelable pressure-sensitive adhesive label that can be repeatedly applied to and peeled off from an adherend can be easily produced even in a small lot using small and inexpensive equipment.

  In addition, this invention is not limited to the said embodiment, Embodiment can be changed suitably in the range of the technical idea of this invention. In addition, the number, position, shape, and the like of the constituent members are not limited to the above-described embodiment, and can be set to a suitable number, position, shape, and the like in practicing the present invention.

It is a schematic sectional drawing of the releasable adhesive label concerning this invention. It is the schematic of the releasable adhesive label manufacturing apparatus with release paper concerning this invention. It is an AA line schematic sectional drawing of FIG. 1 is a schematic view of a releasable pressure-sensitive adhesive label producing apparatus according to the present invention. It is a BB schematic sectional drawing of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Label base material 2 Hot melt type adhesive layer 3 Microsphere adhesive layer 4 Release paper 5 Release agent layer 10 Removable adhesive label 20 Removable adhesive label without release paper 30 Hot melt coater 31 1st supply part 32 1st 1 coating part 33 2nd coating part 34 2nd supply part 35 nip roll 36 winding part

Claims (5)

A hot melt pressure-sensitive adhesive layer is formed on one surface of the substrate, and a microsphere pressure-sensitive adhesive layer in which adhesive microspheres are dispersed on the hot-melt pressure-sensitive adhesive layer is formed. Features a releasable adhesive label. The thickness of the hot melt pressure-sensitive adhesive layer is 5 to 40 µm, and the average particle size of the adhesive microspheres of the microsphere pressure-sensitive adhesive layer is 10 to 80 µm. Removable adhesive label. A release agent layer is formed on the other surface of the substrate, the release agent layer, and the microsphere adhesive layer provided by dispersing adhesive microspheres on the hot melt adhesive layer, The releasable pressure-sensitive adhesive label according to claim 1 or 2, wherein the releasable pressure-sensitive adhesive label is formed in a roll shape. A microsphere formed by coating a hot melt pressure-sensitive adhesive on one surface of a base material to form a hot-melt pressure-sensitive adhesive layer, and dispersing adhesive microspheres on the hot-melt pressure-sensitive adhesive layer A method for producing a releasable pressure-sensitive adhesive label, wherein a microsphere pressure-sensitive adhesive layer is formed by applying a pressure-sensitive adhesive. A release agent is applied to the other surface of the substrate to form a release agent layer, and the release agent layer and the microsphere adhesive layer are brought into contact with each other to form a roll. Item 5. A method for producing a releasable pressure-sensitive adhesive label according to Item 4.

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