JP2016113520A - End sealing adhesive tape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an end sealing adhesive tape that has high disintegration property and can easily be peeled off from the adherend.SOLUTION: Provided is an end sealing adhesive tape including an adhesive portion formed on a substrate along the longitudinal direction, and a non-adhesive portion formed along the side edges of the longitudinal direction, and in which the substrate is paper.SELECTED DRAWING: Figure 2B

Description

  The present invention relates to a fore-sealing adhesive tape.

  Adhesive tape that seals magazines and the like is used to prevent reading at bookstores and convenience stores, and to prevent magazine appendages from falling. Such a small-sealing adhesive tape is usually used by an employee of a retail store manually pasting a book such as a magazine.

  If the sealed book remains unsold, the book is recycled into recycled paper. As a recycling process to recycled paper, there is a disaggregation process in which waste paper is poured into water or an alkaline liquid and loosened into fibers mainly by mechanical action. Since the pressure-sensitive adhesive tape used for sealing has poor disintegration property, it is necessary to remove the tape from the book before the disaggregation process, and the work at the time of recycling becomes complicated.

  In patent document 1, the sealing member which laminated | stacked the adhesive layer which can be disaggregated on the base material with low specific gravity, such as a surface treatment polypropylene film, is disclosed. By using such a low specific gravity base material, the base material floats on the treatment liquid at the time of disaggregation, so that the separation becomes easy.

JP 2007-249119 A

  However, when the sealing member disclosed in Patent Document 1 is pasted, it is necessary to separate the base material in the disaggregation step when recycling magazines and books to make recycled paper, and the viewpoint of improving workability There was room for improvement.

  On the other hand, when peeling an adhesive tape from a to-be-adhered body, the removability that a tape can be easily peeled off from an to-be-adhered body is also required.

  Therefore, an object of the present invention is to provide a fore-sealing pressure-sensitive adhesive tape that has high disaggregation properties and can be easily peeled off from an adherend.

  The present invention has an adhesive part formed on a base material along the longitudinal direction and a non-adhesive part formed on the base material along a side edge in the longitudinal direction, and the base material is paper It is a small-sealing adhesive tape.

  The mouth-sealing adhesive tape of the present invention has high disintegration during recycling and can be easily peeled off from the adherend.

FIG. 1 is a schematic perspective view showing a fore-sealing adhesive tape according to an embodiment of the present invention. FIG. 2A is an arrow view of the fore-sealing adhesive tape of one embodiment of the present invention as seen from the pressure-sensitive adhesive layer surface (inner surface) side. 2B is a schematic cross-sectional view taken along the line BB in FIG. 2A. FIG. 3 is a book having a forehead to which the fore-sealing adhesive tape of the first embodiment is attached.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted. In addition, the dimensional ratios in the drawings are exaggerated for convenience of explanation, and may be different from the actual ratios.

  FIG. 1 is a schematic perspective view showing the fore-sealing adhesive tape of the first embodiment (hereinafter also simply referred to as the adhesive tape of the first embodiment). The pressure-sensitive adhesive tape of the first embodiment has a roll shape wound around an axis.

  In the small-sealed adhesive tape of FIG. 1, 10 indicates an adhesive layer, and 11 indicates a paper substrate. The pressure-sensitive adhesive layer is formed on the paper substrate along the longitudinal direction to form a pressure-sensitive adhesive portion. In 1st Embodiment, the area | region formed along the side edge of a longitudinal direction in which the adhesive layer 10 of a paper base material is not formed turns into a non-adhesion part.

  By disposing the non-adhesive part along the side edge in the longitudinal direction, when the tape is peeled off from the adherend, the non-adhesive part can be easily peeled off from the adherend as a trigger for peeling. .

  In this embodiment, the area where the adhesive layer is not formed on the paper substrate is defined as a non-adhesive part, but the form of the non-adhesive part is not limited to such a form, and the adhesive layer is exposed on the adhesive layer surface. The form is not limited as long as it is not. For example, after the adhesive layer is applied to the entire area of the paper substrate and the adhesive layer is formed on the entire surface of the paper substrate, the paper substrate is further attached along the side edges in the longitudinal direction, It may be formed.

  Moreover, in 1st embodiment, although the non-adhesion part is formed along the both-sides edge of a longitudinal direction, you may form along either one side edge.

  What is necessary is just to set the area | region of a non-adhesion part suitably so that it may be easy to peel again.

  The width of the non-adhesive part is preferably 1 mm or more and 5 mm or less. If it is less than 1 mm, it is difficult to form a non-application part, and if it exceeds 5 mm, it tends to cause unintended peeling. Although the width | variety of an adhesion part is arbitrarily set according to the magnitude | size of a magazine, for example, 10 mm or more and 50 mm or less are mentioned.

  As a method of forming the non-adhesive part along the side edge in the longitudinal direction of the paper base material, while feeding out the paper base material wound up in a roll shape, the adhesive part and the non-adhesive part in the short direction of the paper base material A method of cutting the substantially central part of the non-adhesive part after applying the adhesive so that is repeated alternately and continuously in the longitudinal direction of the paper substrate is preferred. 2A is an arrow view seen from the direction A in FIG. 1, and FIG. 2B is an enlarged cross-sectional view taken along line BB in FIG. 2A. In FIG. 2B, 12 is a sealing layer and 13 is a release agent layer. That is, the sealing layer 12 and the release agent layer 13 are laminated in this order on the surface on the other paper substrate 11 opposite to the surface on which the adhesive layer (adhesive part) 10 is provided. The mouth-sealing adhesive tape of the first embodiment is in a roll shape, and the adhesive layer 10 is in contact with the release agent layer 13 in the radial direction of the roll. The release agent layer is provided for the purpose of facilitating the release of the adhesive with the adhesive layer. When the adhesive tape is fed out from the roll, the adhesive layer is sequentially peeled off from the release layer.

  The adhesive tape is cut into an appropriate length (for example, several centimeters to several tens of centimeters) in consideration of the thickness of the edge of the adherend. FIG. 3 shows a book 20 having a forehead 21 to which the fore-sealing adhesive tape 1 of the first embodiment is attached. In FIG. 3, the fore-sealing adhesive tape 1 of the first embodiment is attached to a book so as to seal the fore-edge 21 of the book 20. Note that the fore edge means a cut surface and includes all of the top edge of the upper side, the bottom side, and the fore edge on the opposite side of the back, but usually a fore mouth sealing tape is used to seal the fore edge. Further, in FIG. 3, although used for sealing a book, the adherend is not particularly limited as long as it has a forehead, and examples of the adherend include printed matter such as a catalog.

  In addition to the form in which the long tape is wound in a roll shape as described above, the form in which the long tape is cut into an appropriate size and the tape on the adherend are included in the small-mouthed adhesive tape of the present invention. The attached form is also included.

  Since the fore-sealing adhesive tape is used for sealing magazines and the like, it is preferable that the contents of the magazines are highly transparent so that the purchaser can see them. Therefore, the opacity of the small-sealing adhesive tape is preferably 30% or less, and more preferably 20% or less. Moreover, it is preferable that the total light transmittance of the fore-sealed adhesive tape is 70% or more. The transparency of the tape depends on the size of the voids contained in the paper. The opacity and total light transmittance are measured by the methods described in the following examples. The lower limit of opacity is 0%, but is usually 5% or more. The upper limit of the total light transmittance is 100%, but is usually 98% or less.

  From the viewpoint of removability, it is preferable that the fore-sealed adhesive tape has an adhesive force measured in accordance with JIS Z-0237: 2009 of 4.0 N / 25 mm or less. In addition, it is preferable that the minimum of adhesive force is 1.5 N / 25mm or more, when adhesiveness is considered.

  Hereinafter, each structural member which comprises the fore-sealing adhesive tape of 1st embodiment is demonstrated.

[Base material]
The substrate is not particularly limited as long as it is a paper substrate, and examples thereof include kraft paper, high-quality paper, glassine paper, parchment paper, rayon paper, coated paper, and water-soluble paper mainly composed of carboxymethylcellulose. Paper has a high disaggregation property with respect to the treatment liquid (water or alkaline solution) in the disaggregation process. By using a paper base material as the base material, the disaggregation property of the adhesive tape is improved, and the adhesive tape remains attached to the adherend. It can be recycled. Among them, kraft paper is preferable in terms of high tear strength, and glassine paper is preferable in terms of high transparency.

  Since the pressure-sensitive adhesive tape of the first embodiment is used for the purpose of sealing the adherend with a small opening, it is preferable that the transparency of the cover of the book is high so that the purchaser can see it. For this reason, it is preferable to use a paper substrate having high transparency. From such a viewpoint, the opacity of the paper base material measured according to JIS P8149: 2000 is preferably 30% or less, and more preferably 20% or less. The lower limit of the opacity of the paper substrate is not particularly limited, but is usually 5% or more.

The thickness of the paper substrate may be appropriately set in consideration of the tape strength and the like, but is usually 30 to 250 μm, and preferably 50 to 150 μm. Moreover, the basic weight of a paper base material is 25-150 g / m < ² > normally, Preferably it is 45-100 g / m < ² >. Moreover, various printings, such as a character and a figure, may be given to the surface in which the release agent layer of a paper base material is provided. Furthermore, the paper substrate may be colored by adding a colorant or the like.

[Adhesive part (adhesive layer)]
It does not specifically limit as an adhesive used for the adhesive layer which comprises an adhesion part, An acrylic adhesive, a rubber adhesive, a silicone adhesive, a urethane adhesive, a polyester adhesive, a styrene-diene block Copolymer adhesives, vinyl alkyl ether adhesives, polyamide adhesives, fluorine adhesives, and the like can be used. The pressure-sensitive adhesives may be used alone or in combination of two or more.

  As the pressure-sensitive adhesive, an acrylic pressure-sensitive adhesive can be particularly preferably used from the viewpoint of reliability of adhesion. The acrylic polymer that constitutes the acrylic adhesive is a monomer (copolymerizable) that has (meth) acrylic acid alkyl ester as the main monomer component and can be copolymerized with (meth) acrylic acid alkyl ester as necessary. Monomer). Examples of alkyl (meth) alkyl esters include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, butyl (meth) acrylate, (meth) Isobutyl acrylate, pentyl (meth) acrylate, hexyl (meth) acrylate, cyclohexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isooctyl (meth) acrylate, decyl (meth) acrylate, (meth ) Dodecyl acrylate, myristyl (meth) acrylate, palmityl (meth) acrylate, stearyl (meth) acrylate, and the like. These may be used alone or in combination of two or more.

  Examples of acrylic copolymerizable monomers copolymerizable with alkyl (meth) acrylate include 2-methoxyethyl (meth) acrylate, 2-ethoxyethyl (meth) acrylate, and (meth) acrylic. 2- (n-propoxy) ethyl acid, 2- (n-butoxy) ethyl (meth) acrylate, 3-methoxypropyl (meth) acrylate, 3-ethoxypropyl (meth) acrylate, 2- (n (Propoxy) propyl, (meth) acrylic acid 2- (n-butoxy) propyl (meth) acrylic acid alkoxyalkyl esters such as; (meth) acrylic acid, itaconic acid, maleic acid, fumaric acid, crotonic acid, isocrotonic acid, etc. Carboxyl group-containing monomers or anhydrides thereof; sulfonic acid group-containing monomers such as sodium vinyl sulfonate; Aromatic vinyl compounds such as len and substituted styrene; cyano group-containing monomers such as acrylonitrile; olefins such as ethylene, propylene and butadiene; vinyl esters such as vinyl acetate; vinyl chloride; acrylamide, methacrylamide and N-vinyl Amide group-containing monomers such as pyrrolidone and N, N-dimethylacrylamide; Hydroxyl group-containing monomers such as hydroxyalkyl (meth) acrylate and glycerol dimethacrylate; Aminoethyl (meth) acrylate and (meth) acrylyl Amino group-containing monomers such as morpholine; Imido group-containing monomers such as cyclohexylmaleimide and isopropylmaleimide; Epoxy group-containing monomers such as glycidyl (meth) acrylate and methyl glycidyl (meth) acrylate; 2-methacryloyl Isocyanate group-containing monomers such as oxyethyl isocyanate; triethylene glycol diacrylate, diethylene glycol diacrylate, ethylene glycol diacrylate, tetraethylene glycol diacrylate, neopentyl glycol diacrylate, 1,6-hexanediol diacrylate, trimethylol Examples thereof include a copolymerizable monomer (multifunctional group monomer) such as propane triacrylate, pentaerythritol triacrylate, dipentaerythritol hexaacrylate, and divinylbenzene. These may be used alone or in combination of two or more.

  The method for producing the acrylic polymer is not particularly limited. For example, a solution polymerization method in the presence of water, a solvent, a chain transfer agent, a polymerization initiator, an emulsifier, a chain transfer agent, or a polymerization initiator. In addition, it can be produced by a known method such as a method of emulsion polymerization in an aqueous system in the presence of a dispersant or the like. Especially, it is preferable to use the acrylic polymer (emulsion type acrylic polymer) obtained by emulsion polymerization from a viewpoint of disaggregation property and adhesiveness.

  Moreover, the pressure-sensitive adhesive prepared in this way may neutralize the carboxyl group in the copolymer alone or before the polymerization or before use.

  As such an adhesive, commercially available products may be used. For example, Arontack RP-275 (manufactured by Toagosei Co., Ltd., alkali-soluble adhesive), trade name “Sebian A-866 (manufactured by Daicel Chemical Industries, Ltd., Water-soluble pressure-sensitive adhesive), Coponil N-2584 (manufactured by Nippon Gosei Co., Ltd., alkali-soluble pressure-sensitive adhesive), and the like may be used.

  The pressure-sensitive adhesive layer preferably contains a surfactant. By containing a surfactant, dispersibility in water is improved during disaggregation, and disaggregation is improved. When an emulsion type acrylic polymer is used as the acrylic polymer, since the surfactant is contained in the polymer, the same effect as that obtained when the surfactant is contained in the pressure-sensitive adhesive layer is obtained.

  If necessary, a colorant, a filler, an antistatic agent, a tackifier, a crosslinking agent, a wetting agent, a leveling agent, a thickener, an antifoaming agent, an antiseptic, and the like can be appropriately added to the pressure-sensitive adhesive layer. . Furthermore, if the adhesive performance of the monomer or copolymer consisting of the above monomers is insufficient for the purpose of use, for example, sugars such as glycerin, sorbitol, mannitol, dulcit, exit, erythrite, arabit, adnit, etc. Copolymers of alcohols, polyethylene oxide or polypropylene oxide and polyhydric alcohols such as glycerin, xylit and sorbit, polyether polyols such as polyethylene glycol and polypropylene glycol, copolymers of ethylene oxide and propylene oxide, polyoxy Hydrophilic plasticizers such as nonionic surfactants such as ethylene alkyl ether, polyoxyethylene alkylphenyl ether, and polyoxyethylene polyoxypropylene glycol may be added.

  Although the thickness of an adhesive layer is not specifically limited, From the viewpoint of adhesiveness and film thickness reduction, the range of 10-100 micrometers is preferable.

Although the formation method of an adhesive layer is not specifically limited, The method of apply | coating an adhesive on a paper base material normally is taken. The coating method is not particularly limited, and the coating can be performed using a known coating apparatus such as a roll coater, knife coater, air knife coater, bar coater, blade coater, slot die coater, lip coater, or gravure coater. The coating amount of the adhesive, on a solids by weight, usually 10 to 100 g / ^{m 2,} preferably 20 to 60 g / ^{m 2.} An adhesive layer is formed by performing a drying process after apply | coating an adhesive on a base material. It does not specifically limit as drying conditions in this case, Usually, it carries out on the conditions for 10 to 60 second at 60-150 degreeC.

  Moreover, you may form an adhesive layer by printing an adhesive. At this time, various known printing machines such as a relief printing machine, a gravure printing machine (intaglio printing machine), a screen printing machine, and an offset printing machine can be used.

[Seamless layer]
The sealing layer is a layer provided to suppress the penetration of the release agent into the base material. For this reason, it may not be used when the release agent is difficult to penetrate into a substrate such as glassine paper.

  The sealing layer preferably contains an aqueous polymer material. As the water-based polymer substance, an emulsion type or aqueous solution type is preferable in consideration of disaggregation. As such a high molecular weight material, for example, a styrene / butadiene copolymer, a polyacrylate ester copolymer, polyvinyl alcohol, polyvinyl pyrrolidone, carboxymethyl cellulose, soluble starch, sodium alginate, polyethylene oxide, or a derivative thereof is used. be able to. These aqueous polymer substances may be used alone or in combination of two or more.

  Moreover, the filler layer may contain a pigment or a dye for the purpose of imparting color.

  The thickness of the sealing layer is not particularly limited, but is preferably in the range of 0.5 to 20 μm from the viewpoint of improving the function and saturating the effect.

The formation of the sealing layer is an emulsion containing the above water-based polymer substance using a known coating apparatus such as a roll coater, knife coater, air knife coater, bar coater, blade coater, slot die coater, lip coater, gravure coater, etc. Or it can obtain by apply | coating aqueous solution on the base material of the other side with respect to the surface in which the adhesive layer is provided. The coating amount of the emulsion or aqueous solution is usually 0.5 to 20 g / m ² , preferably 1.0 to 10 g / m ² in terms of solid content weight. A sealing layer is formed by applying an emulsion or an aqueous solution on the substrate and then performing a drying treatment. It does not specifically limit as drying conditions in this case, Usually, it carries out on the conditions for 10 to 60 second at 60-150 degreeC.

[Release layer]
A release agent layer is a layer provided in order to make it easy to peel an adhesive layer from a roll tape, when using a tape of a roll state.

  As the release agent used for the release agent layer, conventionally known release agents can be appropriately selected and adopted, and examples thereof include silicone, fluororesin, aminoalkyd resin, polyester resin, and the like. These resins are emulsion type, solvent type or none. Any of the solvent types can be used.

  The thickness of the release agent layer is not particularly limited, but is preferably in the range of 0.1 to 20 μm from the viewpoint of improving the function and saturation of the effect.

The release agent layer is formed by using a known coater such as a roll coater, knife coater, air knife coater, bar coater, blade coater, slot die coater, lip coater, gravure coater, etc. It can be obtained by coating on a substrate. The coating amount of the release agent is usually 0.1 to 20 g / m ² , preferably 0.1 to 10 g / m ² in terms of solid weight. A release agent layer is formed by performing a drying treatment after applying the release agent on the substrate. It does not specifically limit as drying conditions in this case, Usually, it carries out on the conditions for 10 to 60 second at 60-150 degreeC.

  In addition to the above-described configuration, the fore-sealing adhesive tape may have other layers between each layer. For example, you may provide the coating layer of the structure similar to the said sealing layer between an adhesive layer and a base material.

  The effects of the present invention will be described using the following examples and comparative examples. Unless otherwise specified, each operation is performed at room temperature (25 ° C.). In addition, this invention is not limited to an Example below.

Example 1
1. Formation of sealing layer Kraft paper having a basis weight of 75 g / m ² was used as a paper substrate. After preparing a sealing layer forming solution having the following composition, a styrene / butadiene copolymer emulsion was applied to one surface of a paper substrate with a gravure coater, and then dried at 120 ° C. for 30 seconds to obtain a coating amount. Of 2 g / m ² and a thickness of 2 μm was formed.

2. Formation of Release Agent Layer After preparing a release agent layer forming solution having the following composition, 1. After the addition reaction type silicone emulsion was applied on the sealing layer of the laminate obtained in Step 1 by a gravure coater, it was dried at 120 ° C. for 30 seconds, the coating amount was 0.5 g / m ² , and the thickness was 0.5 μm. A release agent layer was formed.

3. Formation of pressure-sensitive adhesive layer After preparing a solution for forming a pressure-sensitive adhesive layer having the following composition, 2. After applying the adhesive layer forming solution on the surface of the paper base material on which the sealing layer and release agent layer of the laminate obtained in Step 1 were not formed, drying was performed at 120 ° C. for 1 minute, and the coating amount was 20 g. / M ² , a 20 μm thick adhesive layer was formed to obtain a small-sealed adhesive tape. The coating pattern of the pressure-sensitive adhesive layer was formed in a stripe shape that was alternately repeated with a coating width of the pressure-sensitive adhesive layer of 20 mm and a non-coating width of 5 mm using a die coater in which slits with an opening width of 20 mm were repeated at intervals of 5 mm. Subsequently, by cutting at the center of the non-applied portion, a small-sealed adhesive tape having a paper base width of 25 mm, an adhesive portion width of 20 mm, and non-adhesive portion widths at both ends of 2.5 mm was obtained. .

<Composition of adhesive layer forming solution>
75 parts by mass of 2-ethylhexyl acrylate, 14 parts by mass of vinyl acetate, 5 parts by mass of 2-methoxyethyl acrylate and 6 parts by mass of acrylic acid are emulsion-polymerized, neutralized with 0.4 equivalent of sodium hydroxide, and sorbitol 7 By increasing the viscosity with parts by mass, a solution for forming an adhesive layer was obtained.

(Example 2)
A small mouth-sealing adhesive tape was prepared in the same manner as in Example 1 except that glassine paper having a basis weight of 35 g / m ² was used as the paper substrate.

(Comparative Example 1)
A small-sealing adhesive tape was prepared in the same manner as in Example 1 except that a film (thickness 50 μm) formed of a polypropylene resin was used as the substrate.

(Comparative Example 2)
A small-sealed adhesive tape was produced in the same manner as in Example 2 except that the non-adhesive part was not formed.

<Evaluation method>
1. Disaggregation test Put small-sealing adhesive tape 20 mm x 25 mm (about 4.75 g), fine paper 47.5 g, 50 liters of warm water 2 liters and sodium hydroxide 1 g in a disaggregator, disaggregate for 20 minutes, and disaggregate. The solution was drawn on a 150-mesh wire and the presence or absence of undissolved material was observed with the naked eye.
2. Adhesive force
The adhesive strength was measured according to JIS Z0237: 2009. Specifically, after sticking the small-sealed adhesive tape on a stainless steel plate, the tape was peeled off at a test speed of 300 mm / min in a 180 ° direction by a tensile tester, and the adhesive strength was measured. The results are shown in Table 1.
3. Re-peelability After sticking the small-mouthed adhesive tape on the magazine cover art paper, it was evaluated whether or not the small-sealed adhesive tape could be peeled off without tearing the base material.
4). Opacity According to JIS P8149: 2000, the opacity of the small-sealing adhesive tape was measured.
5. Total light transmittance According to JIS K7361-1: 1997, the total light transmittance of the small-mouth-sealed adhesive tape was measured.

  The results are shown in Table 1.

  <Evaluation results>

  From the above results, the small-sealing adhesive tapes of Examples 1 and 2 have high disaggregation properties, and thus can be recycled with the adhesive tape attached to the adherend.

1 Small-sealed adhesive tape,
10 adhesive layer,
11 Paper base material,
12 Sealing layer,
13 release agent layer,
20 books,
21 Forehead.

Claims (4)

An adhesive part formed on the substrate along the longitudinal direction, and a non-adhesive part formed along the side edge in the longitudinal direction,
A mouth-sealing adhesive tape, wherein the substrate is paper.   The mouth-sealing adhesive tape according to claim 1, having an opacity of 30% or less.   The small-sealing adhesive tape according to claim 1 or 2, wherein the total light transmittance is 70% or more.   The mouth-sealing adhesive tape according to any one of claims 1 to 3, wherein a sealing layer and a release agent layer are laminated in this order on a surface on the other substrate opposite to the surface on which the adhesive portion is provided. .