JP3021357B2 - Wrap film storage carton - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wrap film storage device having a cutting means for cutting a film wound in a roll shape such as a wrap film, and a film holding function for preventing the film end from being rewound after cutting. Regarding carton,
In particular, the present invention relates to an improved technique for a film holding portion which can be formed easily and quickly by printing, and in which the temperature independence of the film holding function is greatly improved.

[0002]

2. Description of the Related Art Conventionally, as a typical method for preventing a film end from being wound back into a carton after a film is cut in a wrap film carton, for example, a wrap film storage box is used. A pressure-sensitive adhesive layer is provided on the surface of the front plate that constitutes the body, and the tip of the side cover that is glued to the position that covers the front plate is peeled off, removed, and opened. There is known a method in which an agent layer is configured to be exposed on the surface of a box body, and the film edge after cutting is held by the pressure-sensitive adhesive layer. In this method, the pressure-sensitive adhesive layer is formed by attaching the sealed pressure-sensitive adhesive layer to the front plate surface.

However, in the case of the above-mentioned conventional method using a pressure-sensitive adhesive, it is not always easy to appropriately adjust the adhesive force of the adhesive itself. Strongly adheres to the pressure-sensitive adhesive layer, causing film breakage when the film is pulled out,
In addition, dust and dirt gradually adhere to the pressure-sensitive adhesive-coated surface, and therefore, there is a problem that the film holding property is reduced and the film becomes unsanitary.

Further, the conventional adhesive has low printability or coatability, and it is not always easy to print or coat the adhesive directly on a storage carton. A method of sticking the applied pressure-sensitive adhesive layer to a predetermined position of a storage carton is usually adopted. Making such an adhesive layer a seal complicates the manufacturing process and is disadvantageous in terms of cost.

Further, conventionally proposed pressure-sensitive adhesives (for example, JP-A-6-270935) are not always satisfactory in temperature dependency. That is,
The conventional pressure-sensitive adhesive layer has a problem that, when the ambient temperature is in the range of 35 ° C. to 40 ° C. or higher, the adhesive force with the film is extremely increased, and peeling becomes difficult.

The present invention has been made in view of the problems of the conventional method of forming a film holding portion using the above-mentioned adhesive, and an object of the present invention is to form a film holding portion by a printing method. Provided is a wrap film storage carton that can be formed, has good holding properties with respect to the wrap film and has a stable temperature dependency, and reduces the manufacturing cost and simplifies and speeds up the manufacturing process. It is in.

[0007]

According to the present invention, a wrap film storage carton having a film holding portion according to the present invention has a film holding portion for preventing a wrap film end from being rewound into a carton after cutting. It is composed of an adhesive layer of a specific resin composition having good properties and excellent both in film holding property and temperature independence, and further forming the adhesive layer does not require a conventional sealing process. In addition, without the need for a special curing device, the adhesive layer can be formed by printing using a normal gravure printing machine, etc., and then dried by a simple and quick process of drying, thereby achieving both performance and productivity. The feature is that it has been improved.

That is, a wrap film storage carton according to the present invention is a long carton for storing a wrap film wound in a roll shape, wherein the wrap film is drawn out from at least an opening provided in a longitudinal direction of the carton. In a wrap film carton provided with a cutting means for cutting by cutting, and a film holding portion for preventing the wrap film end after cutting from rewinding into the carton, wherein the film holding portion is a polyurethane prepolymer. And a pressure-sensitive adhesive layer composed of a cured product of a composition containing a curable pressure-sensitive adhesive component comprising a non-reactive acrylic resin and a curable pressure-sensitive adhesive component.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on preferred embodiments. In the wrap film storage carton of the present invention, the film holding portion for preventing the wrap film end from rewinding into the carton has a pressure-sensitive adhesive layer mainly composed of a polyurethane resin having good adhesion to the wrap film and good retention. Is used. More specifically, the film holding portion in the present invention is composed of a pressure-sensitive adhesive layer composed of a cured product of a composition containing a curable pressure-sensitive adhesive component consisting essentially of a polyurethane prepolymer and a tackiness control component consisting of a non-reactive acrylic resin. It is characterized by becoming.

That is, the above-mentioned polyurethane prepolymer of the present invention is not of the type which forms an adhesive layer which is dried by the action of a crosslinking agent or a curing agent after application, but is an adhesive layer which is dried by heating and drying a solvent component. Using a type that can form
Preferably, a moisture-curable polyurethane resin described later is used. For this reason, in the formation of the adhesive layer, the adhesive layer can be easily and quickly formed on the surface of the film holding portion of the carton by a normal gravure printer or the like. Is also excellent.

Composition of pressure-sensitive adhesive layer (1) The curable pressure-sensitive adhesive component constituting the pressure-sensitive adhesive layer of the film holding portion of the present invention comprises a polyurethane prepolymer.
In a preferred embodiment of the present invention, the polyurethane prepolymer constituting the curable pressure-sensitive adhesive component comprises a moisture-curable polyurethane resin. The moisture-curable polyurethane resin in this case is a polyol and an isocyanate which are NCO / O
A prepolymer obtained by urethanizing under the condition of H> 1 and having an isocyanate group at a terminal and capable of forming a urea bond and curing by reacting with moisture in the air after application of the prepolymer. Shall mean.

In the present invention, as the polyurethane resin used for the adhesive layer, among the above, the molecular weight of the polyol in the constituent component is in the range of 1,000 to 3,000,
And it is preferable to select from the thing whose elongation is in the range of 20-160%.

In the above, when the molecular weight of the polyol is large and the elongation percentage is large, the coating film becomes soft and tacky, and the adhesiveness of the film is improved. Conversely, when the molecular weight of the polyol is small and the elongation percentage is small, the coating film tends to be hard and the tackiness small, and the tackiness of the film tends to decrease. In the adhesive layer of the film holding portion in the present invention, a strong tack is not required, but rather a light tack is preferred. If the tack is too strong, adverse effects may occur, such as blocking after the formation of the coating film, or too strong adhesion to the wrap film.
Therefore, it is optimal that the adhesive layer has a smooth surface and a light tack.

In the present invention, a mixture of two or more prepolymers can be used as the curable pressure-sensitive adhesive component. Such a prepolymer mixture system preferably comprises a mixture of a plurality of types of prepolymers having different molecular weights and elongations of the polyol in the prepolymer component, and in particular, the molecular weight of the polyol in the prepolymer component is preferably 1000
~ 3000, and the elongation is 20 ~ 160
% Of the prepolymer is preferably selected.

Further, in the present invention, if necessary,
A plasticizer or an elastomer may be added to a relatively hard polyurethane-based prepolymer.For example, the addition of a polyol or a polyurethane having a low addition reaction between a polyol and an isocyanate may also increase the elongation, thereby improving the adhesion to the film. As a result, good film retention can be imparted.

(2) On the other hand, the tackiness-controlling component in the present invention means a component which does not itself exhibit tackiness but controls the tackiness properties of the cured polyurethane prepolymer. As such an adhesion control component, a non-reactive acrylic resin is preferably used.
The non-reactive acrylic resin in this case means an acrylic resin that does not substantially react with the functional group of urethane or has low reactivity. Further, the acrylic resin should be understood in a broad sense, and includes a so-called acrylic mixed resin having a polymerized unit in which an acrylate group and another group are combined.

Although the present invention is not limited by any theory, the mechanism by which the non-reactive acrylic resin controls the tackiness can be considered as follows. Usually, a polyurethane-based prepolymer as a curable adhesive component has an isocyanate group (-N
It is considered that CO) reacts with -OH groups derived from moisture in the air to perform wet curing. The present inventors have studied in view of the characteristics of such a polyurethane-based prepolymer,
It has been found that the tackiness of the urethane resin coating film can be effectively controlled by coexisting an acrylic resin which does not substantially react with or has a low reactivity with the functional group of the urethane with the polyurethane prepolymer.
Specifically, the effect described above can be obtained by adding a non-reactive acrylic resin having a small amount of -OH groups. Therefore, theoretically, a non-reactive acrylic resin having no -OH group capable of reacting with a terminal isocyanate group of urethane is ideal. However, since it is necessary to include a component for imparting compatibility for obtaining printability, an acrylic resin component having an -OH group may need to be used. It is important to limit the content of -OH groups in the components. For example, when a non-reactive acrylic resin is formed by combining styrene and hydroxyethyl methacrylate in addition to methyl methacrylate, the amount of the -OH group in the hydroxyethyl methacrylate component is reduced to, for example, about 2% or less. It is preferable to use an acrylic resin composed of units as an adhesive control component. By using such a non-reactive acrylic resin in combination with the curable pressure-sensitive adhesive component, the tack can be controlled to an optimum state, and the temperature dependency can be stabilized, and good printability can be obtained. It is considered possible.

(3) In the present invention, the ratio (solid content ratio) of the curable pressure-sensitive adhesive component / adhesion control component can be appropriately selected according to the properties and characteristics of the components used, but is usually 45/5.
A range of 5 to 50/50 is preferred. By adjusting the content in the above range, the adhesive properties / peeling properties of the adhesive layer can be improved. That is, the present invention is excellent in that the tackiness of the pressure-sensitive adhesive layer is easily controlled since the above-mentioned pressure-sensitive adhesive component is used.

Specifically, it is preferable that the peel strength of the pressure-sensitive adhesive layer of the present invention is in the range of 7 to 20 g, preferably 10 to 15 g. The peel strength in this case is based on a value measured under the following conditions.

First, a rectangular film (25 mm width) of polyvinylidene chloride was brought into close contact with the surface of the adhesive layer, and the weight (g) when one end of the film was pulled vertically at a pulling speed of 300 mm / min was measured. And

According to the above-described embodiment, the obtained pressure-sensitive adhesive layer has a small temperature dependence of peel strength and a small change with time.
It is excellent in having stable adhesive properties. In particular,
It is excellent in maintaining appropriate tackiness even under environmental temperature conditions of around 40 ° C. or higher. In addition, since the pressure-sensitive adhesive layer of the above embodiment contains a combination of a curable pressure-sensitive adhesive component and a pressure-sensitive adhesive control component, so-called solvent separation when forming the pressure-sensitive adhesive layer is good, and coating properties and printability are excellent. This is advantageous in the manufacturing process.

Formation of pressure-sensitive adhesive layer The pressure-sensitive adhesive layer composed of the above composition is usually prepared by dissolving the above-mentioned components in an organic solvent, adding an additive such as a leveling agent, if necessary, and further performing gravure printing. Such a coating solution can be easily formed by appropriately adjusting with a diluent or the like so as to have a viscosity and an evaporating rate suitable for a coating means to be applied, and applying and drying the coating solution. Curing of the coating film occurs during this drying process, and “curing” in the present invention means curing within a range in which the adhesive property intended by the present invention can be exhibited.

The thickness of the adhesive layer when dried is 2 to 10
The thickness may be about μm, and 3 to 6 μm is preferable because the workability of coating is good. When the thickness is 2 μm or less, the smoothness of the surface is insufficient and the retention of the wrap film is likely to be reduced.
A value of m or more is not preferable because the holding property of the wrap film is not further improved, and it takes time to dry the solvent, and the workability and productivity are reduced.

The position where the adhesive layer is provided is not particularly limited as long as the wrap film is pulled out of the carton body and cut, and then the wrap film comes into contact with the carton. However, in general, when cutting a wrap film, the wrap film is sandwiched between the front plate of the carton body and the side cover that overlaps the wrap film, and cut while holding it from the outside. It is pressed against the front plate and it is easy to adhere. Therefore, it is preferable to provide an adhesive layer for holding a film on the front plate surface. The size and shape of the adhesive layer are free, and may be freely determined so as to stabilize the film holding property by the material of the wrap film, the shape of the carton, or the mounting position of the cutting tool.

When the adhesive layer is formed at a predetermined position in the carton, for example, the adhesive layer can be formed directly on the carton body, so that the step of forming the adhesive layer can be inlined into the carton picture printing step. It is advantageous. Further, in addition to this method, a method in which a separate sheet on which an adhesive layer is applied and formed can be adhered to a predetermined position of a carton.

As the wrap film to be stored in the carton according to the present invention, a conventionally known wrap film can be used. In particular, a polyvinylidene chloride film is suitable in combination with the above-mentioned adhesive layer.

Specific embodiment of wrap film storage carton Next, a specific embodiment of the wrap film storage carton of the present invention will be described in more detail with reference to the accompanying drawings and the drawings of the embodiments. In the wrap film storage carton of the present invention, the formation site of the adhesive layer of the polyurethane resin serving as the film holding portion differs depending on the shape of the carton, specifically, the form of cutting means for cutting the film and the mounting position, and is appropriately selected. be able to.

FIG. 1 to FIG. 3 show typical examples of cartons having different forms of film cutting means and different mounting positions, and examples of suitable adhesive layer forming sites for each of them.
The area where the adhesive layer is formed is preferably a region including a position where the film is strongly pressed against the surface of the carton when cutting the wrap film or a region near the region. As a result, the film is naturally adhered by the operation of cutting the film. It is pressed against the layer and adheres and is held.

FIG. 1 is a schematic perspective view showing a first embodiment of a wrap film storage carton according to the present invention, and shows a state in which the carton is opened. FIG. 4 is a development view of a carton of this type, and the names of respective parts are described.

Also, the carton of the type shown in FIGS. 2 and 3 will be described using this name.

In the carton of FIG. 1, when the carton is assembled, the cutting edge of the saw-shaped cutting tool 21 is slightly forward from the bottom plate 3 (designated in FIG. 4) of the carton, that is, It is attached to the surface of the bottom plate 3 so as to protrude toward the front plate 2. In the case of this type, it is preferable that the adhesive layer 22 holding the film is provided at a position shown in the drawing on the surface of the front plate 2 of the carton. By providing at this position, when cutting out the wrapped film, the wrapped film sandwiched between the side cover part 6 and the front plate part 2 of the carton is manually cut from the outside of the side cover part 6. Since the wrap film is fixed to the front plate 2 so as to be pressed against the surface and cut, the wrap film is pressed against the adhesive layer and comes into close contact with the adhesive layer.

Note that the cartons shown in FIGS. 2 and 3 similarly to FIG. 1 show the state after opening each type of carton. Therefore, the film cutting tool 21 of the side cover 6
The further part (glued part) is peeled off and removed at the time of opening by the cutout line 7 (see FIG. 4) provided on each part, and is not shown.

FIG. 2 is a schematic perspective view showing a second embodiment of the wrap film storage carton of the present invention. The characteristic of this carton is that the saw blade-like film cutting tool 21 is V-shaped as shown in the figure. Therefore,
The side cover 6 is provided with a V-shaped cutting line 7 having the same shape as that of the cutting tool 21, and when the pasted portion is peeled off and removed,
In order for the cutting edge of the V-shaped cutting tool 21 to slightly protrude, the cutting tool 21 is attached to the back surface of the side cover 6 at a position where the cutting tool 21 is cut off. When cutting the wrap film, the film is cut from the center of the film toward both sides while holding the film close to the V-shaped tip of the side cover 6.
Therefore, it is preferable that the adhesive layer 22 of the film holding portion is provided at the center of the surface of the front plate portion 2 of the carton or at a position closer to the top as shown in the figure, since the film can be easily adhered.

FIG. 3 is a schematic perspective view showing a third embodiment of the wrap film storage carton of the present invention. This carton saw-like film cutting tool 21 is of a straight type unlike the carton of FIG. 2 described above, and its mounting position is at the end of the linear cutout line 7 provided on the side cover 6. When the glued portion is peeled off and removed, it is attached to the back surface of the side cover 6 so as to hang over the cutout line so that the blade edge slightly protrudes. Then, the adhesive layer 22 for holding the film is provided on the surface of the front plate 2 of the carton, as shown in FIG.
Is provided at a position where the film is pressed.

FIG. 4 is a schematic development view of the wrap film storage carton of the present invention shown in FIG. 1 as described above, in which the names of respective parts are described.

FIGS. 5 and 6 are plan views showing another preferred embodiment of the adhesive layer 22 formed on the front plate portion 2.
As described above, by adopting a form in which the width of the adhesive layer 22 is changed with respect to the width direction of the front plate portion 2, the film holding performance is further improved in combination with the characteristics of the material itself of the adhesive layer. be able to.

[0037]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to specific examples (manufacturing examples). Example 1 A coated ball (paperboard) having a basis weight of 450 g / m ² was used as a carton material, and a predetermined pattern and overprint varnish were printed in-line with the adhesive layer 22 for film holding using an in-line apparatus for gravure rotary printing. Is applied to the position of the carton shown in FIG. 2 so as to have a thickness of 3 μm when dried by using a coating solution having the following composition, and dried to form a carton punch shown in FIG. And punched out to make a carton blank. Subsequently, a V-shaped saw blade-shaped cutting tool 21 is attached to the position shown in FIG.
4 and a cut line 7 of the side cover 6 covering the surface (FIG. 4).
(See FIG. 7), and the back side of the pasted portion is stuck in the longitudinal direction) to prepare the wrap film storage carton of Example 1.

As the coating solution for the adhesive layer for holding a film,
Using the following components, the peel strength was measured by appropriately changing the mixing ratio of the polyurethane prepolymer and the non-reactive acrylic resin.

Solution of polyurethane-based prepolymer (polyol molecular weight 1500-2000, elongation 160%) (solid content 50% by weight) Non-reactive acrylic resin solution (solid content 50% by weight) Diluent solvent Ethyl acetate 55/45, 50/50, 45/5
5. For 100 parts by weight of a 40/60 solution, 30
What was mixed and diluted by weight was used.

The measurement of the peeling characteristics was performed under the following conditions. First, a rectangular film of polyvinylidene chloride (25mm width)
Is adhered to the surface of the pressure-sensitive adhesive layer, and the weight (g) when one end of the film is pulled vertically at a pulling speed of 300 mm / min is defined as a measured value. The results (normal temperature) of the peel test are shown below. Peel strength (g) Polyurethane prepolymer / non-reactive acrylic resin Minimum to maximum average No. 1 55/45 13.2-23.0 18.56 No. 2 50/50 11.0-15.0 12.08 No. 3 45/55 7.0-9.4 8.44 No .4 40/60 5.2-7.0 5.76 As described above, by adjusting the compounding ratio of the polyurethane prepolymer and the non-reactive acrylic resin, the peeling property / adhesive property can be easily adjusted to a favorable range. .

Next, the above No. 1 to No. The results of evaluating the temperature dependence of the peel strength (g) and the change with time for No. 4 are shown below. One day after production Normal temperature 5 ° C 40 ° C Normal temperature 5 ° C 40 ° C 1 19 7 18 Destruction 25 Destruction No. 2 12 8 10 25 15 30 No. 38 5 8 22 11 16 No. 4 6 4 4 15 6 14

Example 2 An adhesive layer was formed in the same manner as in Example 1, and a peel test was performed. However, in this example, the following components were used as the coating liquid for the adhesive layer, and the mixing ratio of the polyurethane prepolymer and the non-reactive acrylic resin was calculated as follows: polyurethane prepolymer / non-reactive acrylic resin = 50 /
It was prepared at a ratio of 25 (solid content ratio).

100 parts by weight of a solution of a polyurethane-based prepolymer (polyol molecular weight 1500-2000, elongation 180%) (solid content 50% by weight) 100 parts by weight Non-reactive acrylic resin solution (solid content 25% by weight) Diluent solvent acetic acid Ethyl 40 parts by weight The peeling characteristics (peeling strength) were measured under the following conditions.

The central part of the adhesive layer is cut into a width of 40 mm and a rectangular film of polyvinylidene chloride (25 mm width)
And one end of the film is pulled at a tensile speed of 30
The weight (g) when pulled vertically under the condition of 0 mm / min is defined as a measured value. Wear.

The evaluation results on the temperature dependency of the peel strength (g) and its change with time are shown below. On the other hand, for comparison, TSS KL-D2 (a graft copolymer obtained by graft polymerization of a vinyl chloride monomer to an ethylene vinyl acetate copolymer and an acrylic resin added thereto; see JP-A-6-270935). The evaluation results (Comparative Example 1) in the case where the pressure-sensitive adhesive layer was formed by using the same were also described below. Immediately after application Measurement 1 day after application Measurement 5 days after application Measurement Room temperature 5 ° C 40 ° C Room temperature 5 ° C 40 ° C Room temperature 5 ° C 40 ° C Example 1 20 10 20 25 18 24 28 20 26 Example 2 10 9 11 14 14 18 16 14 20 Comparative Example 1 68 52 146 94 65 247 112 58 284

In addition, the wrap film of the polyvinylidene chloride resin, the wrap film of the polyvinyl chloride resin, the wrap film of the polyethylene resin, A wrap film made of polymethylpentene resin
After individually filling and packaging, they are opened, the wrap film is pulled out and cut three times a day for 30 days, and the film retainability due to adhesion of the wrap film to the adhesive layer, removability, and their The temperature dependence and the change over time were evaluated.

As a result, in the wrap film storage carton of the example, the adhesiveness of the wrap film of the polyethylene resin and the polymethylpentene resin was slightly low, whereas the polyvinylidene chloride was not. There was no problem at all with respect to the wrap film of the base resin and the polyvinyl chloride resin, and the wrap film was good with no change over time.

On the other hand, the wrap film storage carton of the comparative example has weak adhesion to the adhesive layer with respect to the polyvinyl chloride resin wrap film, and has the adhesive layer with other wrap films. Had no adhesion and the film retention was insufficient.

[0049]

Since the present invention is configured as described above, it has the following effects. In the wrapping film storage carton of the present invention, the film holding portion for preventing the rewinding of the film end is formed of a resin adhesive layer. Well, no extra cost or operation is required.

The adhesive layer holding the film includes:
Applying a coating solution for the adhesive layer and heating and drying the solvent component to form a dried coating film. In addition, an adhesive layer can be easily and quickly formed by a normal gravure printing machine or the like without requiring a sealing process as in the related art. Therefore, it is possible to process the image in-line with the printing of the pattern, and the productivity is good, the production is easy, and the cost is advantageous.

Further, the formed adhesive layer is excellent not only in that it has excellent adhesive properties with the wrap film, but also that it has stable temperature-dependent peeling strength and little change over time, and has stable adhesive properties.

Further, since the pressure-sensitive adhesive layer according to the present invention comprises a combination of a curable pressure-sensitive adhesive component and a pressure-sensitive adhesive control component, the pressure-sensitive adhesive layer can have good pressure-sensitive adhesive properties / peeling properties. For example, the present invention is excellent in that the tackiness of the pressure-sensitive adhesive layer is easily controlled since the above-mentioned pressure-sensitive adhesive component is used. In addition, as described above, the obtained adhesive layer is excellent in that it has a small temperature dependency of peel strength and a small change with time, and has stable adhesive properties. Further, since the curable pressure-sensitive adhesive component and the pressure-sensitive adhesive control component are combined and compounded, so-called solvent separation when forming the pressure-sensitive adhesive layer is good, and the coating properties are excellent, which is advantageous in the production process. .

As described above, according to the present invention, it is possible to easily provide a wrapping film storage carton having a film holding portion which is inexpensive and has excellent productivity and performance.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing a first embodiment of a wrap film storage carton of the present invention.

FIG. 2 is a schematic perspective view showing a second embodiment of the wrap film storage carton of the present invention.

FIG. 3 is a schematic perspective view showing a third embodiment of the wrap film storage carton of the present invention.

FIG. 4 is a schematic development view of the wrap film storage carton of the present invention shown in FIG.

FIG. 5 is a plan view showing another preferred embodiment of the adhesive layer formed on the carton front plate.

FIG. 6 is a plan view showing another preferred embodiment of the adhesive layer formed on the carton front plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wrap film storage carton 2 Front plate part 3 Bottom plate part 4 Rear plate part 5 Top cover plate part 6 Side cover part 7 Cutting line 21 Film cutting tool 22 Adhesive layer (film holding part)

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B65D 5/00-5/72 B65D 25/00-25/52 C09D 175/04

Claims (17)

(57) [Claims] 1. A long carton for storing a wrap film wound in a roll form, comprising: cutting means for extracting and cutting the wrap film from at least an opening provided in a longitudinal direction of the carton; In a wrap film carton provided with a film holding portion for preventing the wrap film end from being cut back into the carton after cutting, the film holding portion does not react with a curable adhesive component made of a polyurethane-based prepolymer. And a pressure-sensitive adhesive layer comprising a cured product of a composition containing a pressure-sensitive adhesive component comprising a reactive acrylic resin, wherein the polyurethane prepolymer has a polyol having a molecular weight of 1,000 to 3 in the prepolymer component.
000 and the elongation is selected from prepolymers in the range of 20-160%,
Wrap film storage carton. 2. The wrapping film-containing carton according to claim 1, wherein said polyurethane-based prepolymer comprises a moisture-curable polyurethane resin. 3. The moisture-curable polyurethane resin is a prepolymer obtained by urethanizing a polyol and an isocyanate under the condition of NCO / OH> 1, and has a terminal isocyanate group. 3. The wrap film storage carton of claim 2, wherein the wrap film storage carton is made of a prepolymer that can react with moisture in the air to form a urea bond and cure. 4. The composition according to claim 1, further comprising a curable elastomer.
Containing, wrap film accommodating carton according to claim 1. 5. A long carton for storing a wrap film wound in a roll shape, comprising: cutting means for extracting and cutting the wrap film from at least an opening provided in a longitudinal direction of the carton; In a wrap film carton provided with a film holding portion for preventing the wrap film end from being cut back into the carton after cutting, the film holding portion does not react with a curable adhesive component made of a polyurethane-based prepolymer. An adhesive layer comprising a cured product of a composition containing an adhesive control component comprising an acrylic resin, wherein the adhesive control component comprises a mixture of methyl methacrylate, styrene and hydroxyethyl methacrylate. , Wrap film storage carton. 6. The wrapping film-containing carton according to claim 5, wherein the wrapping film-containing carton comprises polymerized units having an OH group content of the hydroxyethyl methacrylate component of 2% or less. 7. The wrap film stored in a carton is a polyvinylidene chloride film.
A wrap film storage carton according to any one of the preceding claims. 8. The wrap film storage carton according to claim 1, wherein the pressure-sensitive adhesive layer comprising a cured product of the polyurethane-based prepolymer-containing composition is formed by a printing method. 9. An elongate carton for storing a wrap film wound in a roll shape, comprising: cutting means for extracting and cutting the wrap film from at least an opening provided in a longitudinal direction of the carton; In a wrap film carton provided with a film holding portion for preventing the wrap film end from being cut back into the carton after cutting, the film holding portion does not react with a curable adhesive component made of a polyurethane-based prepolymer. And an adhesive layer comprising a cured product of a composition containing an adhesive control component comprising an acrylic resin, wherein the adhesive layer exhibits stable adhesive strength when the ambient temperature is both normal temperature and 40 ° C. Characterized by a wrap film storage carton. 10. The pressure-sensitive adhesive layer according to claim 1, wherein the environmental temperature is normal
Express stable adhesive strength in both cases at 0 ° C.
A wrap film storage carton according to any one of claims 1 to 8. 11. made from a composition comprising a tacky control component comprising a curable adhesive component and a non-reactive acrylic resin comprising a polyurethane prepolymer, said polyurethane-flop
Repolymer is the polyol of the prepolymer component
The molecular weight is in the range of 1000-3000, and the elongation
Selected from prepolymers in the range of 20-160%
An adhesive, characterized in that: 12. The pressure-sensitive adhesive according to claim 11 , wherein the polyurethane-based prepolymer comprises a moisture-curable polyurethane resin. 13. The moisture-curable polyurethane resin is a prepolymer obtained by urethanizing a polyol and an isocyanate under the condition of NCO / OH> 1, and has a terminal isocyanate group. 13. The pressure-sensitive adhesive according to claim 12 , comprising a prepolymer that can react with moisture in the air to form a urea bond and cure. 14. The pressure-sensitive adhesive according to claim 11 , wherein the composition further comprises a curable elastomer. 15. The adhesive control component, methyl methacrylate, of styrene, and mixtures of hydroxyethyl methacrylate, adhesive of claim 11. The amount of 16. OH group of the hydroxyethyl methacrylate component consisting in a polymerized units less than 2%, wherein
Item 16. The pressure-sensitive adhesive according to Item 15 . 17. The pressure-sensitive adhesive according to any one of claims 11 to 16 , wherein the pressure-sensitive adhesive layer after curing has stable pressure-sensitive adhesive strength at both ambient temperature and at 40 ° C.