JP2003225962A - Adherend with tacky label and label release method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an adherend with a tacky label which can be released only when soaked in hot water, and a label release method. <P>SOLUTION: This adherend with a tacky label has an attached tacky label, with air finely distributed and sealed between the surface of a pressure-sensitive adhesive layer of the tacky label and the surface of the adherend. The air is inflated by soaking the adherend in hot water and the tacky label is released from the adherend. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is constructed so that an adhesive label attached to an adherend such as a glass bottle, an aluminum can, a steel can, a plastic bottle can be easily peeled off in hot water. The present invention relates to an adherend with an adhesive label and a method for peeling such an adhesive label from the adherend. More specifically, when the adherend is a container,
During sterilization / cleaning before and after filling the contents, distribution, sales process, etc., and when the adherend is a card-like product, distribution,
Adhesive labels with an adhesive label that can be easily peeled off only when immersed in hot water without the adhesive label peeling off from these adherends in the sales process and the like. The present invention relates to a label peeling method.

[0002]

2. Description of the Related Art For example, it is used as a container for beer to which an adhesive label is attached, alcohol such as shochu, soy sauce, vinegar, seasonings such as mirin, soft drink, detergent, cosmetics, pharmaceuticals, processed foods, etc. In order to collect and recycle glass bottles, aluminum cans, steel cans, plastic bottles, etc., and card-like objects (hereinafter, these are referred to as "adherends"), peel off the labels attached to the adherends. There is a need to. Therefore, conventionally, an adhesive label using a water-soluble or alkali-soluble pressure-sensitive adhesive is used, and water, warm water, an alkaline solution or the like is used as a cleaning liquid in the recycling step to wash off, or water, warm water or an alkali is used. A method of reducing the adhesive strength of the label in the solution and peeling the label has been adopted.

However, in such a method, it takes a considerable time to dip the cleaning liquid in the pressure-sensitive adhesive layer, and the label is peeled off with high-pressure water and the adhesive is removed by a rubber roller or brushing. Since it is necessary, it takes a long time to completely remove it, and large-scale equipment is required. Also, when an alkaline solution is used, a neutralization process is required for the waste liquid treatment after the treatment,
There is a drawback that it is costly to consider the environment and collect adherends.

Due to the above reasons, in recent years, various proposals have been made regarding containers for easily peeling off the adhesive label attached to the containers. For example, Japanese Examined Utility Model Publication No. 6-3423 proposes a method of rapidly peeling a label by partially providing an adhesive layer between the label base material and the container surface so as to immediately infiltrate the cleaning liquid. ing. In Japanese Patent Laid-Open No. 8-30201, not only is the adhesive provided partially, but when it is attached to a container, an intrusion hole for allowing the label peeling liquid to infiltrate from the label base material surface to the adhesive portion. Provided container labels have been proposed.

However, a container to which such a label is attached may have a decrease in the adhesive force of the label to the container due to heat in a sterilizing and washing step such as an alkaline (warm) water shower before filling the contents. When the water enters the adhesive layer, the label may be displaced or easily peeled off. Further, since the adhesive is partially provided, there is a problem that dust and the like are apt to be mixed in a portion where the adhesive is not present in the distribution process, resulting in poor appearance.

Further, there has been proposed a label which can be easily peeled off by heating by using a plastic film having a large heat shrinkability (Shokai 63-138).
No. 584, Japanese Utility Model Publication No. 5-22337, etc.). However, when washing the container with heat such as a hot water shower before filling the contents such as beverages and processed foods, when the label is heat-shrinked in the washing step and is curled or peeled off, or plastic Only the film may shrink, leaving the adhesive in the container.

Further, in Japanese Patent Laid-Open No. 11-228921, the heat-expandable resin particles which expand when immersed in warm water are contained in a water-insoluble pressure-sensitive adhesive layer. Apparent specific gravity is 1 when the resin particles expand
A pressure-sensitive adhesive sheet having a lesser amount and a peeling method thereof have been proposed. In the above proposal, the pressure-sensitive adhesive sheet is immersed in warm water, the heat-expandable resin particles contained in the pressure-sensitive adhesive layer are expanded to peel the pressure-sensitive adhesive sheet from the adherend, and the pressure-sensitive adhesive sheet floating on the hot-water surface is collected. is there. However, it goes without saying that the pressure-sensitive adhesive sheet containing the heat-expandable resin particles in the pressure-sensitive adhesive has a higher cost than the pressure-sensitive adhesive sheet not containing the heat-expandable resin particles, and the pressure-sensitive adhesive containing the heat-expandable resin particles. Conditions for coating and drying the agent on the substrate are restricted.
For example, when coating and drying a solvent-based or emulsion-based pressure-sensitive adhesive, etc., it must be dried below the temperature at which the heat-expandable resin particles expand, and in that case, especially when the concentration of the pressure-sensitive adhesive is low. It will take a long time and production efficiency will deteriorate.

On the other hand, in the case of a hot-melt type pressure-sensitive adhesive, since the elastomer, resin, etc. are melted and coated at a high temperature (100 ° C. or higher), the heat-expandable resin particles naturally expand or foam, and Unable to manufacture adhesive sheet. Furthermore, the pressure-sensitive adhesive sheet containing the heat-expandable resin particles is affected by the particle size, shape, and amount of the heat-expandable resin particles, but it is difficult to adjust it so that it is not exposed at all on the surface of the pressure-sensitive adhesive layer. Therefore, there are various problems that the heat-expandable resin particles are likely to fall off in the processing step and adhere to the roll of the coater.

[0009]

DISCLOSURE OF THE INVENTION The present invention, in the case where the adherend is a container, is used in the sterilization, washing, distribution, and sales steps before and after filling the contents, and when the adherend is a card-like material. In the case of distribution and sales process, the adhesive label does not float or peel off during normal handling, and the adhesive label can be easily peeled off only when immersed in hot water. It is an object to provide a body and a peeling method thereof.

[0010]

Means for Solving the Problems As a result of intensive studies to solve the above problems, the present inventors have found that air is finely distributed between the surface of an adhesive layer and the surface of an adherend of an adhesive label. It was discovered that the adhesive label can be easily peeled off from the adherend by enclosing it and immersing the adherend in hot water to expand the air. is there.

The present invention includes the following inventions. (1) An adherend with an adhesive label, to which an adhesive label is attached, wherein air is finely distributed and contained between the surface of the adhesive layer of the adhesive label and the surface of the adherend. An adhesive label-attached article, wherein the air is expanded by immersing the attached article in hot water, and the adhesive label is peeled off from the adherend.

(2) When the adhesive label is attached, air is finely distributed and contained in the surface portion of the adherend,
The adherend with an adhesive label according to item (1), wherein the surface of the adherend has a fine uneven shape.

(3) The adherend with an adhesive label according to item (2), wherein the fine irregularities on the surface of the adherend have an average center line roughness (Ra) of 0.1 to 8.0 μm.

(4) When the adhesive label is attached, air is finely distributed and contained in the surface portion of the adherend,
The surface of the pressure-sensitive adhesive layer of the pressure-sensitive adhesive label has fine irregularities, and the adherend with a pressure-sensitive adhesive label according to item (1) is characterized.

(5) The fine concavo-convex shape on the surface of the pressure-sensitive adhesive layer in the pressure-sensitive adhesive label is formed by transferring from a release sheet having a center line average roughness (Ra) of the release agent-treated surface of 0.5 μm to 10 μm. An adherend with an adhesive label according to item (4).

(6) Using an optical contact area measuring device,
The contact area between the pressure-sensitive adhesive layer surface of the pressure-sensitive adhesive label and the surface of the adherend measured under an environment of 23 ° C. and 50% RH (6 at 2 kg load).
The value after 0 second) is 60% or more and 95% or less (1) to
The adherend with an adhesive label according to any one of (5).

(7) As a test plate, a glass plate [a glass plate means a class A float plate glass (5 mm) described in JIS R 3202] is used, and the temperature is 23 ° C. and 50% RH in accordance with JIS Z 0237. 18 of the adhesive label
The adherend with an adhesive label according to any one of items (1) to (6), which has a 0-degree peeling adhesive strength (N / m) of 50 to 500.

(8) Any one of the above items (1) to (7)
Characterized in that the pressure-sensitive adhesive label-attached article described in paragraph (1) is immersed in hot water, and the finely-distributed, encapsulated air is thermally expanded to peel off the pressure-sensitive adhesive label from the adherend surface. Adhesive label peeling method.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below.
In the first aspect of the present invention, an adhesive label is attached to the surface of an adherend in a state where air is finely distributed and contained, and when the adhesive label is peeled from the adherend, the label is attached. It is an adherend with an adhesive label, characterized in that the adherend can be peeled off from the surface of the adherend by immersing the adherend in hot water and thermally expanding the enclosed air. The adherend in the present invention includes a card-shaped object in addition to the container, but in the following description, the container is used as a representative of the adherend.

In the present invention, the target container is not particularly limited, but it is necessary that it is difficult to be deformed by heat because the container is immersed in hot water.
By the way, for plastic containers that are easily deformed by heat, the container expands and contracts in hot water, so the adhesive label partially floats, and air may be finely distributed and contained between the adhesive label and the container. Therefore, the problem of the present invention cannot be solved.

In the present invention, one means for finely distributing and containing air between the pressure-sensitive adhesive layer surface and the container surface can be achieved by forming the surface portion of the container into fine irregularities. By providing such fine irregularities on the surface of the container, it is possible to finely distribute and enclose air between the surface of the container and the surface of the container when an adhesive label is attached. Then, it is preferable that all the fine irregularities on the container surface are covered with the adhesive label when the adhesive label is attached. Moreover, it is preferable that the portion other than the uneven portion is smooth. Further, the uneven portion should not be exposed when the adhesive label is attached. This is because it becomes difficult to contain air, and expansion may reduce the effect of pressing up the label.

The fine concavo-convex shape provided on the surface of the container for obtaining the effects of the present invention has an average center line roughness (Ra) of 0.1 to 8.0 μ, preferably 0.3 to.
It is about 5.0 μm. Incidentally, the center line average roughness (R
If the value of a) is less than 0.1 μm, the absolute amount (volume) by which air can be finely distributed and contained is small, so that even with hot water treatment, air expansion is small and a sufficient peeling effect cannot be expected. on the other hand,
This is because when the center line average roughness (Ra) exceeds 8.0 μm, it becomes difficult to finely distribute and contain air between the pressure-sensitive adhesive layer surface and the container surface.

In order to more surely contain the air,
The maximum height (Rmax) of the irregularities on the surface of the container is 15 μm.
It is preferably less than 10 μm, more preferably less than 10 μm. This is because when the maximum height (Rmax) is 15 μm or more, it may be difficult to contain air when the adhesive label is attached.

The method of providing the fine irregularities on the container is not particularly limited. For example, when the container is a metal can, it is finely surface-roughened at the time of its molding or before and after it is molded into a can body. There is a method of transferring by pressing a rough surface transfer tool. Further, when the container is a glass bottle, a method of roughening a part of the container surface when molding the bottle container, or after molding the bottle container, on the surface of the glass bottle at the exit of the annealing furnace, fine Examples thereof include a method of partially applying a coating agent such as a solid lubricant for forming irregularities, and a method of forming fine irregularities on the surface of a glass bottle using diamond or the like.

In the present invention, another means for finely distributing and containing air on the surface of the container is to form the surface of the pressure-sensitive adhesive layer of the pressure-sensitive adhesive label into fine irregularities. If this means is adopted, the same effect as providing a fine uneven shape on the container surface can be achieved, that is, air can be finely distributed and contained on the container surface. When immersed in it, it is possible to expand the air in hot water and peel off the adhesive label.

As a method for providing fine unevenness on the surface of the pressure-sensitive adhesive layer of the pressure-sensitive adhesive label, the unevenness is formed on the release sheet covering the pressure-sensitive adhesive layer and the surface of the pressure-sensitive adhesive layer is in contact with the release sheet. It is preferable to adopt a method of transferring the uneven shape of the release sheet onto the surface of the pressure-sensitive adhesive layer.

When the surface of the pressure-sensitive adhesive layer of the pressure-sensitive adhesive label is provided with fine irregularities by the above method, a release sheet having a center line average roughness (Ra) of the release agent-treated surface of 0.5 μm to 10 μm should be used. It is possible with. By the way, if the center line average roughness (Ra) is less than 0.5 μm, even if the uneven shape of the release sheet is transferred to the surface of the pressure-sensitive adhesive layer, the absolute amount (volume) of air trapped when it is attached to the container Therefore, even if hot water treatment is performed, air expansion is small and a sufficient peeling effect cannot be expected. On the other hand, the center line average roughness (Ra) is 10
This is because if it exceeds μm, it becomes difficult to finely distribute and contain air between the surface of the adhesive layer and the surface of the container.

In order to contain the air more surely,
Maximum height (Rmax) of the release agent treated surface of the release sheet
Is preferably less than 25 μm, more preferably less than 15 μm. However, it is difficult for the pressure-sensitive adhesive layer of the pressure-sensitive adhesive label to completely enter the uneven portion of the release agent-treated surface, and even if it enters, since the pressure-sensitive adhesive is an elastic body, the maximum height of the release agent-treated surface is high. Sa (Rm
Even when ax) is 25 μm or more, when it is attached to a container,
If air can be finely distributed and contained between the surface of the adhesive layer and the surface of the container, there is no problem.

When the container with the adhesive label is immersed in hot water, the adhesive label may be peeled off within 60 minutes.
It is preferable to carry out washing and peeling with hot water because the working efficiency is improved.

As a method of controlling the peeling time of the adhesive label in hot water, the volume of air contained between the surface of the adhesive layer and the surface of the container is changed. Change the adhesive strength of the adhesive label to the container. The cohesive force of the adhesive layer of the adhesive label is changed. There are such things.

Specific methods for changing the volume of the air enclosed between the surface of the pressure-sensitive adhesive layer and the surface of the container include a method of enlarging the area of fine irregularities provided in the container portion to which the adhesive label is attached, There is a method of increasing the difference between the convex and the convex or a method of changing the center line average roughness of the release sheet. By these methods, the volume of air to be contained can be increased and the peeling time of the adhesive label from the container can be shortened. On the contrary, if necessary, the area of the fine irregularities may be reduced, or the difference between the concaves and the convexes may be reduced to prolong the peeling time from the container.

By finely distributing and containing air between the surface of the pressure-sensitive adhesive layer and the surface of the container as described above, the enclosed air expands only in hot water, and the expanded air pushes up the label and adheres from the container. The label can be peeled off. To reduce the time until the adhesive label is peeled off by immersing the container with the adhesive label in hot water, combine the means to raise the hot water temperature or the means such as alkaline (warm) water or showering with hot water. It is also possible to further promote peeling.

As the surface substrate constituting the adhesive label,
Although it is not particularly limited, conventionally known adhesive labels can be used, for example, a polyolefin film,
Polymer film such as polyester film (hereinafter also referred to as base film), paper such as kraft paper, glassine paper, high quality paper, cast paper, art paper, clay coated paper, or synthetic paper (hereinafter also referred to as base paper) ) Is mentioned. Above all, it is water resistant, does not soak into the base material of the pressure sensitive adhesive, and does not escape the sealed air to the outside until it is expanded in hot water, so it is a particularly excellent polyolefin film or polyester in terms of airtightness. It is preferable to use a base film or the like as the substrate.

Further, it is preferable to use a polyolefin film as a base film which is excellent in low cost and conformability to a container. For example, polypropylene, low density polyethylene, medium density polyethylene, high density polyethylene, ethylene-α- Olefin copolymer, propylene-α-olefin copolymer, ethylene-
Ethyl acrylate copolymer, ethylene-vinyl acetate copolymer, ethylene-methyl methacrylate copolymer,
Examples thereof include ethylene-n-butyl acrylate copolymers, which can be used alone or as a mixture in any combination, and may have a single-layer structure or a multi-layer structure. More preferably, a biaxially oriented polypropylene film is preferable because it has excellent tensile strength, transparency, thermal stability and the like.

The surface substrate preferably has a thermal expansion and contraction rate at 90 ° C. in the range of -3 to 3% in both longitudinal and lateral directions. Further, it is preferable that the thermal expansion and contraction rate is 0 to 3% in both the vertical and horizontal directions, or -3 to 0% in both the vertical and horizontal directions. Thermal expansion rate
When it is less than 3% or more than 3%, the surface substrate shrinks (thermal expansion rate is greater than 0%) or stretches (thermal expansion rate is less than 0%) during high-temperature (water) treatment such as sterilization and washing. This is because when the value becomes large, the product value and image may be deteriorated, such as the pattern printed on the surface substrate is deformed, or the label may be lifted or peeled off due to water entering the adhesive layer of the adhesive label.

When the above-mentioned high temperature water treatment is carried out, one direction shrinks (the thermal expansion / contraction rate is larger than 0%) and the direction intersecting with it expands (the thermal expansion / contraction rate is less than 0%). It is not preferable because the label will be lifted up significantly. The thermal expansion and contraction rate (%) of the surface base material is a surface base material having a length of 120 mm × 120 mm in the vertical direction × horizontal direction (100 mm × 100 so as to intersect at the center of the base material from each of the vertical and horizontal directions).
mm line) is immersed in warm water set to a constant temperature for 30 minutes, and changes in length (line length) in the longitudinal direction and the lateral direction before and after the immersion are calculated by the following mathematical formula: {(immersion It is calculated from the following formula: length before immersion-length after immersion / (base material length before immersion)} × 100.

The surface substrate has a printing ink receiving layer on the surface on which the adhesive layer is formed or on the opposite surface of the substrate in order to facilitate printing for displaying the contents when the adhesive label is attached to the container. It may be provided, and in order to further improve the adhesion of the printing ink receiving layer to the substrate, for example, flame treatment and / or corona discharge treatment, isocyanate compounds, resins having an oxozaline group, resins having an ethyleneimine group, etc. The anchor processing may be applied.

The printing ink receiving layer is made of, for example, acrylic resin, polyester resin, ionomer resin, ethylene copolymer resin, SBR resin, vinyl acetate resin or the like, or acrylic resin, polyester resin. , SBR-based resins, and polyolefin-based resins in which oxazoline groups are graft-bonded, and the like, and the printing ink-receiving layer is appropriately selected depending on the type of substrate, the type of printing ink, and the like.

As a method of forming these printing ink receiving layers, conventionally known methods can be used, for example, a metering bar method, a gravure roll method, an air knife method, a spray method, a reverse roll method, a lip coater method and the like can be used. .

When the printing ink receiving layer is provided, the thickness of the coating layer is not particularly limited, but is 0.05 to 5.0 μm.
It is a degree. If it exceeds 5.0 μm, especially when a transparent substrate film is used, the printing ink-receiving layer may become cloudy due to high-temperature water treatment and the appearance may be impaired. May be impaired. The printing ink receiving layer may contain organic and / or inorganic pigments in order to prevent blocking.

The substrate film may contain a light stabilizer, an ultraviolet absorber, an antioxidant, an antiblocking agent, if necessary.
An auxiliary agent such as a filler can also be added. When paper is used as the surface base material, one or both sides are laminated with a sealing layer containing a water-soluble polymer such as polyvinyl alcohol or starch and / or a pigment as a main component or a film such as polyethylene to enhance airtightness. Is preferably used. It is more preferable that the film is laminated.

An anchor treatment layer is preferably provided on the surface of the surface base material used in the present invention on which the pressure-sensitive adhesive layer is formed in order to enhance the adhesion with the pressure-sensitive adhesive. The anchor treatment layer is appropriately selected depending on the type of surface substrate, adhesive, etc., and is not particularly limited, but, for example,
Resins containing polyester, polyurethane, acrylic polyol, polyethyleneimine, polyacrylamine, polyacrylic acid ester, modified polyolefin, oxazoline, ethylene-vinyl acetate copolymer, vinyl chloride-vinyl acetate copolymer, etc. as a main component, alone or It can be mixed and used.

If necessary, a reactive layer such as an isocyanate compound or an epoxy compound may be added to provide a single layer or a plurality of layers. Further, when the surface substrate is a resin film, in order to improve the adhesion with the anchor treatment layer, for example, flame treatment, corona treatment, ultraviolet treatment, electron beam treatment, radiation treatment, plasma treatment, solvent treatment, etc. are performed. After that, the anchor layer may be provided. Among these, having an anchor treatment layer in which an isocyanate compound is added to a mixture of polyacrylic acid ester, acrylic polyol and vinyl chloride-vinyl acetate copolymer improves the adhesion to the surface base material and the pressure-sensitive adhesive layer. Therefore, it is preferable.

The thickness of the surface base material is not particularly limited, but it is about 15 to 200 μm, preferably 20 to 100 μm in terms of processability, ease of handling, and cost.
It is a degree.

The pressure-sensitive adhesive used in the present invention is not particularly limited, and a natural rubber-based pressure-sensitive adhesive, a synthetic rubber-based pressure-sensitive adhesive, an acrylic prepolymer, or an acrylic-based polymer containing an acrylic monomer as a main component. Acrylic pressure sensitive adhesives, urethane pressure sensitive adhesives, silicone pressure sensitive adhesives, etc., which are mainly composed of resin can be used. Among these, it is preferable to use an acrylic pressure-sensitive adhesive having excellent weather resistance, transparency, and odorlessness. The form is not particularly limited, but solvent type, solventless type, emulsion type, hot melt type and the like can be used. The acrylic pressure-sensitive adhesive is, for example, a resin obtained by copolymerizing (meth) acrylic acid ester or another copolymerizable vinyl monomer.

Specifically, as the (meth) acrylic acid ester, for example, (a) alkyl group, (b) alkoxyl group, (c) phenyl group, (d) benzyl group, (e)
Ring-opened ethylene oxide group, (f) tetrahydrofurfuryl group, (g) amide group, (h) carboxyl group,
Examples thereof include those having (i) hydroxyl group, (j) phosphoric acid group, (k) sulfonic acid group, (l) amino group, (m) epoxy group and the like.

Specific examples of the (meth) acrylic acid ester having (a) an alkyl group include methyl (meth) acrylate, ethyl (meth) acrylate,
Isopropyl (meth) acrylate, lauryl (meth)
Acrylate, stearyl (meth) acrylate, butyl (meth) acrylate, hexyl (meth) acrylate, cyclohexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isoamyl (meth) acrylate, isooctyl (meth) acrylate, n-
Examples include octyl (meth) acrylate, dodecyl (meth) acrylate, isobutyl (meth) acrylate and the like. Among these, those having a higher alkyl group are
Among them, 2-ethylhexyl acrylate and butyl acrylate contribute to the improvement of adhesiveness, and are preferably used because they have a relatively low glass transition temperature. Further, those having a lower alkyl group contribute to the improvement of cohesiveness.

Examples of (b) those having an alkoxyl group include methoxyethyl (meth) acrylate, ethoxyethyl (meth) acrylate, butoxyethyl (meth) acrylate, and phenoxyethyl (meth) acrylate.

(C) As having a phenyl group,
Examples thereof include phenyl (meth) acrylate, p-tert-butylphenyl (meth) acrylate, and o-biphenyl (meth) acrylate.

Examples of (d) those having a benzyl group include benzyl (meth) acrylate.

Examples of the compound (e) having a tetrahydrofurfuryl group include tetrahydrofurfuryl (meth) acrylate.

(F) As a compound having a ring-opened ethylene oxide group, diethylene glycol (meth) acrylate, methoxydiethylene glycol (meth) acrylate, methoxypolyethylene glycol (meth) acrylate, phenoxydiethylene glycol (meth)
Examples thereof include acrylate and phenoxy polyethylene glycol (meth) acrylate.

(G) As having an amide group,
(Meth) acrylamide, N-methylol (meth) acrylamide, N-methoxymethyl (meth) acrylamide, N, N'-methylenebis (meth) acrylamide and the like can be mentioned.

As an example of a monomer containing a functional group,
(H) As those having a carboxyl group, acrylic acid, methacrylic acid, itaconic acid, 2-methacryloyloxysuccinic acid, 2-methacryloyloxyethyl maleic acid, 2-methacryloyloxyethyl phthalic acid, 2-
Methacryloyloxyethyl hexahydrophthalic acid and the like can be mentioned.

(I) As those having a hydroxyl group, 2-hydroxyethyl (meth) acrylate, 2-
Examples thereof include hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, and 3-chloro-2-hydroxyethyl (meth) acrylate.

(J) having a phosphate group includes 2
-Methacryloyloxyethyl diphenyl phosphate (meth) acrylate, trimethacryloyloxyethyl phosphate (meth) acrylate, triacryloyloxyethyl phosphate (meth) acrylate and the like.

(K) Those having a sulfonic acid group include sodium sulfopropyl (meth) acrylate,
2-sulfoethyl (meth) acrylate sodium, 2
-Sodium acrylamido-2-methylpropane sulfonate, sodium 3-allyloxy-2-hydroxypropane sulfonate and the like can be mentioned.

(L) Those having an amino group include dimethylaminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate, N-tert-butylaminoethyl (meth) acrylate, methacryloyloxyethyltrimethylammonium chloride (meth). Acrylate etc. are mentioned.

(M) As having an epoxy group,
Examples thereof include glycidyl (meth) acrylate and methylglycidyl (meth) acrylate.

(N) Other copolymerizable vinyl monomers include fatty acid vinyl such as vinyl acetate and vinyl propionate, styrene, maleic acid, fumaric acid, vinyl sulfonic acid and styrene sulfonic acid.

Among the above monomers, examples of hydrophilic monomers include acrylic acid, methacrylic acid, crotonic acid,
Ethylenically unsaturated carboxylic acid-containing monomers such as maleic acid, fumaric acid, monoalkyl maleic acid, monoalkyl itaconic acid and monoalkyl fumaric acid, alkoxyalkyl (meth) acrylates such as methoxyethyl acrylate and ethoxyethyl acrylate, carboxylic acid modification Rosin ester, caprolactone adduct of (meth) acrylic acid, hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, (meth) acrylamide, dimethylaminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate Etc.

The content of the hydrophilic monomer is preferably 0.1 to 10 mass% in the monomer composition of the acrylic resin. If it exceeds 10% by mass, the adhesive strength may increase after high-temperature treatment, the adhesive layer may swell in (warm) water, may be dispersed or dissolved, or may be cloudy, which is not preferable.

To adjust the tackiness and cohesiveness, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, dipropylene glycol di (meth) acrylate, 1,3- Butylene glycol di (meth) acrylate, 1,4-butanediol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, tetramethylolmethane tetra (meth) acrylate, Polyfunctional monomers such as N, N'-methylenebisacrylamide and divinylbenzene can be copolymerized.

The method for producing these acrylic resins is not limited as long as it is a conventionally known polymerization method. For example, it is polymerized by an emulsion polymerization method, a solution polymerization method, a suspension polymerization method, a bulk polymerization method, or the like, and preferably, the one polymerized by the emulsion polymerization method or the solution polymerization method is preferable.

Further, conventionally known additives in the field of adhesives may be added. For example, natural resins such as rosin for improving adhesive properties, modified rosin, rosin and modified rosin derivatives, polyterpene resins, terpene modified products, aliphatic hydrocarbon resins, cyclopentadiene resins, aromatic petroleum resins, Phenolic resin, alkyl-phenol-acetylene-based resin, coumarone-indene resin, vinyltoluene-α-methylstyrene copolymer, and other tackifiers, various plasticizers, softeners such as oil, adjust cohesiveness To improve the coating properties, thickeners for improving coatability, wetting agents, anti-aging agents for preventing deterioration, stabilizers, UV absorbers, other fillers, pigments, colorants, antistatic agents, etc. It can be added to the acrylic resin as needed. These may be used in combination of two or more, if necessary. Further, in order to suppress the change in adhesive strength due to the atmosphere, it is preferable that the amount of the additive is less than 5% by mass of the entire adhesive.

As the cross-linking agent, (a) epoxy type,
(B) aziridine type, (c) isocyanate type, (d)
There are metal type, and (a) epoxy type includes sorbitol polyglycidyl ether, polyglycerol polyglycidyl ether, pentaerythritol polyglycidyl ether, diglycerol polyglycidyl ether, triglycidyl-tris (2-hydroxyethyl) isocyanurate, glycerol. Polyglycidyl ether, trimethylolpropane polyglycidyl ether, resorcin diglycidyl ether, neopentyl glycol diglycidyl ether, 1,6-hexanediol diglycidyl ether, bisphenol-S-diglycidyl ether, ethylene glycol diglycidyl ether, polyethylene glycol di Glycidyl ether, propylene glycol diglycidyl ether, adipic acid diglycidyl ester, - phthalic acid diglycidyl ester can be exemplified.

(B) As the aziridine type, tris-
2,4,6- (1-aziridinyl) -1,3,5-triazine, tris [1- (2-methyl) aziridinyl] phosphine oxide, hexa [1- (2-methyl) -aziridinyl] triphosphatriazine Can be illustrated. (C)
As the isocyanate type, toluylene diisocyanate, 2,4-toluylene diisocyanate dimer, naphthylene-1,5-diisocyanate, o-toluylene diisocyanate, diphenylmethane diisocyanate, triphenylmethane triisocyanate, hexamethylene diisocyanate, trimethylhexamethylene diisocyanate, Examples thereof include isophorone diisocyanate, xylylene diisocyanate, and polyisocyanate prepolymer. (D) As a metal system, Mg ²⁺ , Ca
Examples thereof include metal oxides, metal salts, and metal chelate compounds containing ²⁺ , Zn2 ⁺ , Al3 ^{+ and the} like. Among these, it is preferable to use an aziridine-based or isocyanate-based cross-linking agent, which has a rapid cross-linking reaction and can suppress the change in the peeling-off pressure-sensitive adhesive force due to the atmosphere by increasing the cross-linking density of the pressure-sensitive adhesive.

To form the pressure-sensitive adhesive layer, the pressure-sensitive adhesive layer may be formed on the surface base material and / or the release sheet. For example, a pressure-sensitive adhesive sheet can be obtained by applying the pressure-sensitive adhesive as described above to a release sheet, drying it to form a pressure-sensitive adhesive layer, if necessary, and laminating the pressure-sensitive adhesive layer on a surface base material. Examples of the adhesive coating device include a reverse roll coater,
A knife coater, a bar coater, a slot die coater, an air knife coater, a reverse gravure coater, a variogravure coater, a lip coater, a die coater, a comma coater, etc. are used, and the coating amount is 5 to 50 g / m ^{2 in} dry weight. , And more preferably 10
It is adjusted in the range of 30 g / m ² . By the way, if it is less than 5 g / m ² , the adhesive force to the container becomes insufficient while
If it exceeds 0 g / m ² , the pressure-sensitive adhesive may squeeze out and the printability may deteriorate.

Using an optical contact area measuring device at 23 ° C.,
The contact area (value after 60 seconds under a load of 2 Kg) between the pressure-sensitive adhesive layer surface of the pressure-sensitive adhesive label and the container surface measured in a 50% RH environment is preferably 60% or more and 95% or less. Incidentally, if the contact area is less than 60%, it is not preferable because the adhesive label is easily peeled from the container in the sterilization / washing process before and after filling the contents with the container, the distribution process, the sales process and the like. On the other hand, if it exceeds 95%, the pressure-sensitive adhesive label is not easily peeled off even when the pressure-sensitive adhesive label-equipped container is immersed in hot water, which is not preferable. Therefore, in order to use the adhesive label having the contact area of more than 95% attached to the container and to easily peel off the adhesive label in hot water, it is necessary to use a container having fine irregularities on the container surface. .

The pressure-sensitive adhesive label used in the present invention is a pressure-sensitive adhesive label obtained by removing the release sheet of the pressure-sensitive adhesive sheet as a test piece, and a glass plate as a test plate (a glass plate is J
Class A float plate glass described in ISR 3202 (5m
2) according to JISZ 0237
It is preferable that the 180 ° peeling adhesive strength in an environment of 3 ° C. and 50% RH is 50 to 500 N / m.

By the way, the above 180 degree peeling adhesive strength is 5
If it is less than 0 N / m, the adhesive strength is particularly decreased before and after filling the contents into a rounded container, or after the container is sterilized or washed with high temperature or hot water (including an alkaline solution). However, it is not preferable because the pressure-sensitive adhesive label may float or peel off from the container. On the other hand, when it exceeds 500 N / m, the pressure-sensitive adhesive label may not be peeled off from the container even when air is expanded by hot water treatment. Therefore, it is not preferable.

Furthermore, it is preferable that the holding force of the pressure-sensitive adhesive label under a load of 1 kg is 5 minutes or more. If it is less than 5 minutes, the cohesiveness of the pressure-sensitive adhesive layer of the pressure-sensitive adhesive label attached to the container is lowered regardless of the adhesive force, and the pressure-sensitive adhesive label may be displaced or peeled off. The holding force is a numerical value obtained by sticking the adhesive label on a stainless steel plate so that the sticking area is 25 mm × 25 mm, applying a load of 1 kg, and measuring the time until the adhesive label falls. Yes, it is an index showing the cohesive strength of the adhesive.

Further, the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer of the pressure-sensitive adhesive label has a storage elastic modulus (G ') at room temperature of 0.8 to 2
It is preferably 0 N / cm ² . The storage elastic modulus is a dynamic viscoelasticity measuring device (Reovibron DDV-25
FP, manufactured by Orientech Co., Ltd.) is used to measure the shear deformation of a pressure-sensitive adhesive formed into a plate having a thickness of about 2 mm at 23 ° C. and a frequency of 1 Hz. Incidentally it is less than 0.8N / cm ² reduces the holding force of the pressure-sensitive adhesive, pressure-sensitive adhesive layer on the release agent surface of the release sheet centerline average roughness exceeds 20 N / cm ² (Ra) of was adjusted to a specific value It is not preferable to peel off the release sheet of the pressure-sensitive adhesive label to which is adhered and to attach it to the container, because it becomes difficult to finely distribute and contain air between the pressure-sensitive adhesive layer and the container.

The release sheet covering the pressure-sensitive adhesive layer is not particularly limited as long as the center line average roughness (Ra) of the release agent-treated surface is 0.5 μm to 10 μm. For example, glassine paper and high-quality paper. , Kraft paper, cast paper, synthetic paper, impregnated paper, polymer film, etc., are coated with a known release agent such as fluororesin or silicone resin to a dry weight of about 0.05 to 3 g / m ² , and heat is applied. Those provided with a release agent layer by curing, ultraviolet curing, ionizing radiation curing or the like are appropriately used. Incidentally, when the center line average roughness (Ra) is less than 0.5 μm, the unevenness of the release agent-treated surface of the release sheet does not copy to the adhesive layer surface, and the volume of air that can be contained when attached to the container becomes small. However, it is not preferable because the adhesive label cannot be peeled off from the container by the hot water treatment. On the other hand, when the center line average roughness (Ra) exceeds 10 μm, air will be generated between the adhesive layer surface of the adhesive label and the container surface. It becomes difficult to finely distribute and contain
It is not preferable because the pressure-sensitive adhesive label is easily peeled off in the process of washing with a cleaning liquid such as an alkaline water or the like with a pressure-sensitive adhesive label, a hot water shower, etc., and it is apparently bumpy when viewed from the surface.

When a polymer film having a smooth center line average roughness of less than 0.5 μm, such as polyethylene terephthalate or polypropylene, is used as the base material of the release sheet, the base material before the release agent is applied is corona-treated beforehand. It is preferable to apply surface treatment such as embossing to 0.5 μm or more. It is possible to process and use the surface after applying the release agent, but it is not preferable because it may cause heavy release or damage due to the influence on the release agent layer.

When paper is used as the base of the release sheet, it is preferable to use a paper that has been subjected to sealing treatment to suppress the penetration of the release agent.

As the sealing layer, one containing a pigment and / or an adhesive as a main component is used, and examples of the adhesive include polyvinyl alcohol, polyvinylpyrrolidone, polyethyleneimine, polyacrylic acid salts, starches, and cellulose. Derivatives, urethane resins, acrylic resins, polyester resins, alkyd resins, melamine resins, styrene-butadiene copolymer latex, styrene-acrylic copolymer latex and acrylic ester resin systems may be used alone or in combination. it can. From the viewpoint of being relatively inexpensive, there is also a method of laminating a film such as polyethylene on a substrate.

Examples of the pigment include inorganic pigments such as kaolin, aluminum hydroxide, heavy calcium carbonate, light calcium carbonate, titanium oxide, talc, satin white, calcium sulfate, barium sulfate, zinc oxide and silica,
Polypropylene resin, polyethylene resin, styrene resin, acrylic-styrene resin, urea-formalin resin,
Organic pigments such as melamine-formalin resin and benzoguanamine resin can be used alone or in combination.

The method for controlling the center line average roughness (Ra) of the release sheet within the range of 0.5 μm to 10 μm is not particularly limited, but when the substrate is a film, it is contacted after the film is produced, for example, after T-die extrusion. The release agent may be applied after adjusting the surface roughness of the embossing roll surface or after applying a coating agent that makes at least one surface side of the film a rough surface. Further, it may be formed by applying a corona treatment or pressing with an embossing roll before and after applying the release agent.

When the base material of the release sheet is paper, for example, the center line average roughness (R) of the release sheet can be obtained by appropriately combining a sealing layer for adjusting the size and amount of the above pigment.
It is possible to adjust a). Further, similar to the method for the film, it is formed by applying a coating agent such that at least one side of the paper becomes a rough surface, or by applying a corona treatment or an embossing roll before and after applying the release agent. You may let me.

As a coating apparatus for forming the release agent layer,
A bar coater, an air knife coater, a direct gravure coater, an offset gravure coater, a multi-stage roll coater, etc. are appropriately used. It is not limited to these.

[0082]

The present invention will be described in more detail below with reference to examples, but the present invention is not limited thereto.

<Evaluation Items> [Center Line Average Roughness of Container / Release Sheet] The center line average roughness (Ra) of the container and the release sheet is a universal surface shape measuring instrument (“MODEL SE-3C” manufactured by Kosaka Laboratory). ) Was used in accordance with JIS B 0601 (1982) with a cutoff of 0.8 mm and a measurement length of 4 mm. If necessary, use the same measuring device and measuring method as above to determine the maximum height (Rm
It is also possible to obtain ax).

[Contact Area of Adhesive Label] Contact Area Measuring Device [Mizojiri Optical Industry Co., Ltd. "Optical Contact Area Measuring Device"]
The contact area of the pressure-sensitive adhesive layer of the pressure-sensitive adhesive label from which the release sheet of the pressure-sensitive adhesive sheet was peeled off was measured under a 23 K, 50% RH environment after 60 seconds under a load of 2 kg.

[Adhesive strength] An adhesive label was used as a test piece, and a glass plate was used as a test plate.
Class A float plate glass described in R 3202 (5 mm)
23) according to JIS Z 0237
The 180 ° peeling adhesive strength (N / m) was measured under the environment of 50 ° C and 50% RH.

[Sterilization / Washing Test] The adhesive label was placed in a glass container (manufactured by Toyo Glass Co., Ltd., 3 ° C, 50% RH environment).
(00 ml capacity) with a pasting area of 50 mm length × 100 mm width
The adhesive label was reciprocated and then sterilized and washed, and the displacement, floating and peeling of the adhesive label were observed and evaluated based on the following evaluation criteria. (Evaluation Criteria) ○ …… Showers the entire container with 1.5% alkaline hot water at 80 ° C for 5 minutes to sterilize and wash it, and then to 80 ° C.
Immediately after washing with warm water for 10 minutes, and then at 23 ° C., 50
Even if it is stored for 30 days under% RH environment
There is no floating or peeling. △: Shower sterilized and washed by showering the entire container with 1.5% alkaline hot water at 80 ° C for 5 minutes, then at 80 ° C
Immediately after washing with warm water for 10 minutes, and then at 23 ° C., 50
Although the pressure-sensitive adhesive label does not peel off even after being stored in the% RH environment for 30 days, the pressure-sensitive adhesive label is slightly displaced or lifted under any of the processing conditions (not to the extent of impairing the appearance). ×: Shower sterilized and washed by showering the entire container for 5 minutes with hot water of 1.5% alkaline at 80 ° C, and then at 80 ° C
Immediately after washing with warm water for 10 minutes, or 23 ° C,
When the adhesive label is stored for 30 days in a 50% RH environment, the pressure-sensitive adhesive label may deviate, float, or come off.

[Hot water peeling test] At 23 ° C. and 50% RH, the pressure-sensitive adhesive label was placed in a glass container (manufactured by Toyo Glass Co., Ltd., 30
(0 ml capacity), so that the pasting area is 50 mm in length x 100 mm in width, and the container with an adhesive label that has passed one day after reciprocating once with a 2 Kg pressure roll is immersed in water (90 ° C). It was dipped in and the time until the adhesive label peeled from the container was measured. In addition, when the adhesive label was not peeled off from the container for 24 hours, it was determined not to be peeled off.

Examples 1-5, Example 7, Comparative Examples 1-3,
Comparative Example 5 The following materials (container: a, b, release sheet: I to E, surface substrate: S1, S2, adhesive: I to IV) were combined as shown in Table 1, and the release agent of each release sheet was combined. Each pressure-sensitive adhesive layer coating liquid was applied to the treated surface with a comma coater so that the dry weight was 15 g / m ^2, and dried at 100 ° C. for 1 minute, and then the pressure-sensitive adhesive layer surface and the surface substrate were attached. A pressure sensitive adhesive sheet is obtained together. Peel off the release sheet and attach it to each container,
A container with an adhesive label was produced in which air was finely distributed and contained between the surface of the adhesive layer of the adhesive label and the surface of the container.

(Container) Container (a) ... Glass container (Returnable bottle manufactured by Toyo Glass Co., Ltd., 300 ml capacity) Container (b) ... Beverage can (Yakult coffee can: Coffee, 250 ml capacity)

(Release sheet) Release sheet (a) ... Fine paper (manufactured by Oji Paper Co., Ltd .: 64 g / m)
² ) on one side, melting point 133 ° C., density 0.939 g / c
m ³ medium density polyethylene (Tosoh Corporation: LW04-1)
Was extruded and laminated (extruded resin temperature at die-slip outlet was 330 ° C., thickness was 15 μm, mat was used as cooling roll), and silicone-based release agent (trade name: SD-7220, Toray Dow Corning) was applied to the laminated surface. Dissolve 100 parts with toluene,
1 part of a catalyst (SRX-212 manufactured by Toray Dow Corning Co., Ltd.) was added, and a well-stirred mixed solution (release agent coating solution) was applied to the base paper for release paper to have a solid content of 0.3 g / m ^2. Apply and dry the layered surface. The obtained release sheet has a center line average roughness (Ra) of 2.8 μm.

Release sheet (b): The center line average roughness (R) obtained by the same material and method as in (a) except that the cooling roll in the manufacturing process of (a) above was replaced by a supermirror.
a) 0.8 μm release sheet.

Release sheet (c): Immediately after extruding a film made of polypropylene, the center line average roughness (Ra) is 12
100 parts of a silicone-based release agent (trade name: SD-7220, manufactured by Toray Dow Corning Co., Ltd.) was dissolved in toluene on the embossed surface of a polypropylene film (biaxially stretched) brought into contact with an embossing roll of μm, and a catalyst (Toray Dow) was used. Corning SRX-212) (1 part) and well stirred were used as a release agent coating solution, and the solid content was 0.15 g / m ^2.
Apply and dry so that The obtained release sheet has a center line average roughness (Ra) of 8.9 μm and a thickness of 40 μm.

Release Sheet (d): Release sheet made of polyethylene terephthalate film (manufactured by Oji Paper Co., Ltd .: Separate 38RL-07, thickness 38 μm, Ra = 0.3 μ)
m)

Release sheet (e): Immediately after extruding a film made of polypropylene, the center line average roughness (Ra) 16
100 parts of a silicone-based release agent (trade name: SD-7220, manufactured by Toray Dow Corning Co., Ltd.) was dissolved in toluene on the embossed surface of a polypropylene film (biaxially stretched) brought into contact with an embossing roll of μm, and a catalyst (Toray Dow) was used. 1 part of Corning SRX-212) was added and well mixed to give a mixed solution (release agent coating solution) which was coated and dried to a solid content of 0.15 g / m ² . The obtained release sheet has a center line average roughness (Ra) of 12.4 μm and a thickness of 40 μm.

(Surface base material) Surface base material (S1) ... Biaxially oriented polypropylene film ("PY-101" manufactured by Oji Paper Co., Ltd., thickness 50 μm)
m ”) as an easy print layer, a coating agent of acrylic acid ester copolymer (trade name“ X-590-3 ”manufactured by Saiden Chemical Co., Ltd.
54 W ") to a thickness of 1.0 μm,
On the side opposite to the easy print layer, a copolymer of acrylic polyol and vinyl chloride (manufactured by Dainichiseika Co., Ltd., trade name "two-component reaction type ink VM-D medium", glass transition temperature 50 ° C or higher), and an isocyanate compound ( A thickness of 0.7 after diluting the product name "VM-D curing agent" manufactured by Dainichiseika Co., Ltd. with toluene.
The surface base material obtained by applying the coating solution so as to have a thickness of μm to form an anchor coat layer (thermal expansion / contraction rate in the vertical direction at 90 ° C .: 0.36
%, Thermal expansion / contraction ratio in the lateral direction: 0.42%) Surface substrate (S2) ... Expanded polyethylene terephthalate film (trade name "Crisper K-171 manufactured by Toyobo Co., Ltd."
1 ", thermal expansion / contraction ratio in the vertical direction at 90 ° C .: 0.33%, thermal expansion / contraction ratio in the horizontal direction 0.02%, thickness 50 μm).

(Adhesive) Adhesive (I) ... 75 parts by mass of 2-ethylhexyl acrylate as main monomer, 5 parts by mass of vinyl acetate, 20 parts by mass of butyl acrylate, and 100 parts of these main monomers.
A composition prepared by mixing 5 parts by mass of acrylic acid with respect to parts by mass is copolymerized in a mixed solution of toluene / acetone = 90/10 at 60 ° C. for 4 hours to obtain an acrylic acid copolymer having a solid content concentration of 45 wt%. It was An adhesive obtained by adding and mixing 2.5 parts by mass of 2,4-tolylene diisocyanate as a cross-linking agent to 100 parts by mass of the obtained acrylic ester copolymer and stirring with an agitator.

Adhesive (II) ... 100 parts by mass of an acrylic adhesive (manufactured by Toyo Ink, trade name "BPS5448") and an aziridine crosslinking agent (manufactured by Toyo Ink, trade name "B").
XX5134 ") 1 part by mass added and mixed. Adhesive (III) ... 100 parts by mass of an acrylic adhesive (manufactured by Saiden Chemical Co., Ltd., trade name “OPT3”) and an isocyanate-based crosslinking agent (manufactured by Saiden Chemical Co., Ltd., trade name “AL”).
8 parts by mass, Al chelate crosslinking agent (trade name "M-2",
Saiden Kagaku Co., Ltd., trade name "M-2") 0.8 parts by mass each added and mixed. Adhesive (IV) ... Acrylic adhesive (manufactured by Nippon Carbide Industry Co., Ltd., trade name “KP-1909”) in 100 parts by mass of a crosslinking agent (manufactured by Nippon Carbide Industry Co., Ltd., trade name “CK-10”).
3 ") 0.7 parts by mass added and mixed.

Example 6 As a container, a router (PROXXON mini router No. 2) having a diamond at the tip on the surface of (a).
8511) was used to form a glass bottle (c) in which fine irregularities were partially formed. The pressure-sensitive adhesive (I) was applied to the release agent-treated surface of the release sheet (d) with a comma coater so that the dry weight was 15 g / m ^2, and dried at 100 ° C. for 1 minute, and then the pressure-sensitive adhesive layer surface and the surface. The anchor coat layer surface of the substrate (S) was attached to obtain an adhesive sheet. The release sheet of the obtained pressure-sensitive adhesive sheet was peeled off and attached to the fine irregularities of the container (c) so as to cover all the fine irregularities, so that there was no gap between the surface of the adhesive layer and the container surface. A container with an adhesive label in which air was finely distributed and contained regularly was produced.

Comparative Example 4 As a container, a router (PROXXON mini router No. 2) having a diamond on the tip of the surface of (a) was used.
8511) was used to form a glass bottle (c) in which fine irregularities were partially formed. On the release agent-treated surface of the release sheet (a), the adhesive (I) was coated with a comma coater so that the dry weight was 15 g / m ^2, and dried at 100 ° C. for 1 minute, and then the adhesive layer surface and the surface. The anchor coat layer surface of the substrate (S) was attached to obtain an adhesive sheet. The release sheet of the obtained pressure-sensitive adhesive sheet was peeled off, and the pressure-sensitive adhesive sheet was adhered to the fine irregularities of the container (c) so that a part of the fine irregularities was exposed to produce a container with an adhesive label.

[0100]

[Table 1]

The containers with pressure-sensitive adhesive labels thus obtained and the pressure-sensitive adhesive labels for containers were evaluated as described above, and the results are shown in Table 2.

[0102]

[Table 2]

As is clear from Table 2, according to the method for peeling an adhesive label of the present invention, an adhesive label attached to a smooth container such as a glass bottle, a steel can, an aluminum can, and the like before and after filling the contents. It did not come off from the container after the sterilization / washing step or after sterilization / washing, and could be easily peeled off by immersing in hot water.

In Comparative Examples 1 and 5, the pressure-sensitive adhesive label was not peeled off after the sterilization / washing step before and after filling the contents, or after the sterilization / washing, but the pressure-sensitive adhesive label was not peeled off even when immersed in hot water. It was Comparative Examples 2 and 3 are not suitable for practical use because the sterilization / washing process before and after filling the contents and the adhesive label peeled off after sterilization / washing. In Comparative Example 4, sterilization / washing steps before and after filling the contents,
After sterilization and washing, the pressure-sensitive adhesive label floated, and in the hot water peeling test, a part of the pressure-sensitive adhesive label floated but did not peel off.

[0105]

According to the present invention, the adhesive label attached to a smooth container such as a glass bottle, a steel can, an aluminum can is
It is possible to prevent the container from being peeled off from the container after the sterilization / washing process before and after filling the contents and after the sterilization / washing, and to easily peel it by immersing it in hot water. Therefore, it is not necessary to use an alkaline cleaning liquid or the like and a large-scale facility, so that it is possible to obtain an effect that a container can be collected with less influence on the environment and work efficiency.

Further, since it is possible to adjust the time when the adhesive label is peeled from the container when immersed in hot water, for example, a product containing a retort food or a beverage which is cooked and warmed with the container in hot water. It is also possible to provide a food and drink container capable of notifying the completion of cooking and warming time by peeling off the adhesive label. In addition, the containers used will have their adhesive labels removed by the general consumer,
It becomes possible to omit the step of collecting the container and peeling the adhesive label.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C09J 201/00 C09J 201/00 G09F 3/10 G09F 3/10 J // B65B 69/00 B65B 69/00 ZF term (reference) 3E058 AA10 CB10 3E062 AA04 AA09 AC02 AC03 AC06 BA20 BB06 BB10 DA02 DA07 4F100 AG00A AK03B AT00A AT00B BA02 CB05 DD07A HB31B JL14 CA01 A02 A01 A02 A01 A02 A02 A01 A02 A02 A02 A02 A02 A02 A02 A02 A02 A02 A02 A02 A02 A02 A02 A02 A02 A02 A02 A02 A02 A02 A02 A02 A01 A02 A02 A02 A02 A02 A02 A02 A02 A01 A02 A02 A02 A02 A01 A02 A01 A02 A02 A02 A02 A02 A02 A02 A02 CA001 CA011 DF001 DF021 DF041 DF051 DF061 DF101 EF001 EK031 JA09 JB09 NA21 PA23 PA42

Claims (8)

[Claims] 1. An adherend with an adhesive label, to which an adhesive label is attached, wherein air is finely distributed and contained between the surface of the adhesive layer of the adhesive label and the surface of the adherend. An adherend with an adhesive label, which is configured such that the air expands when the adherend with an adhesive label is immersed in hot water and the adhesive label is peeled off from the adherend. 2. The surface part of the adherend has fine irregularities so that air can be finely distributed and contained in the surface part of the adherend when the adhesive label is attached. The adherend with an adhesive label according to claim 1. 3. The adherend with an adhesive label according to claim 2, wherein the fine irregularities on the surface of the adherend have an average center line roughness (Ra) of 0.1 to 8.0 μm. 4. The surface of the pressure-sensitive adhesive layer of the pressure-sensitive adhesive label has fine irregularities so that air can be finely distributed and contained in the surface portion of the adherend when the pressure-sensitive adhesive label is attached. The adherend with an adhesive label according to claim 1. 5. The fine concavo-convex shape of the pressure-sensitive adhesive layer surface of the pressure-sensitive adhesive label has a center line average roughness (R
The adherend with an adhesive label according to claim 4, wherein a) is formed by transferring from a release sheet having a thickness of 0.5 μm to 10 μm. 6. An optical contact area measuring device is used to measure 23
The contact area (value after 60 seconds under a load of 2 Kg) between the pressure-sensitive adhesive layer surface of the pressure-sensitive adhesive label and the adherend surface is 60% or more and 95% or less, measured in an environment of 50 ° C and 50% RH. An adherend with an adhesive label according to any one of 5 above. 7. A glass plate as a test plate [What is a glass plate?
Class A float plate glass according to JIS R 3202 (5
mm) is used], the 180 degree peeling adhesive strength (N / m) of the adhesive label in the environment of 23 ° C. and 50% RH according to JIS Z 0237 is 50 to 500. The adherend with an adhesive label according to any one of claims. 8. By immersing the adherend with an adhesive label according to any one of claims 1 to 7 in hot water, and thermally expanding the air that is finely distributed and contained. A method for peeling an adhesive label, which comprises peeling the adhesive label from the surface of an adherend.