JP2678677B2 - Adhesive material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a sticking material, which is attached to an object to be stuck such as a postcard, concealing a confidential matter portion, and a legitimate recipient,
The present invention relates to a sticking material in which a confidential matter portion can be appropriately viewed.

(Prior Art) Adhesives have been developed that are attached to objects to be attached, such as postcards, so as to hide the entry of confidential matters and allow the authorized recipient to see the contents relatively easily. ing.

FIG. 11 is a partial cross-sectional view showing a usage example of a conventional adhesive material for a postcard. The postcard 1 includes a postcard mount 2 formed in the size of a postcard manufactured by a government official, and an adhesive material 3 attached to a part of the postcard mount 2. This adhesive material 3 includes a base material 4.
An adhesive layer 5 is formed on one main surface of the substrate 4. On one main surface of the adhesive layer 5, a hiding layer 6 made of aluminum is formed. The base material 4 and the hiding layer 6 are adhered by the adhesive layer 5. On one main surface of the concealing layer 6, a release agent layer 7 is formed. On one main surface of the release agent layer 7, a heat-adhesive resin layer 8 is formed. The postcard mount 2 is formed on one main surface of the heat-adhesive resin layer 8. The heat-adhesive resin layer 8 is melted when heated, and the adhesive 3 is attached to the postcard mount 2.

(Problems to be Solved by the Invention) However, in the conventional adhesive material, even when the adhesive material is heated and pressed to be adhered to the adherend, the adhesive material is adhered with an appropriate and stable adhesive force. Was difficult.

That is, if the adhesive strength is too strong, the adherend may be damaged when the adhesive is peeled off from the adherend. Further, if the adhesive strength is too weak, there is a risk that a part of the adhesive material may come off during the mailing of the adherend.

Therefore, the main object of the present invention is to allow a legitimate recipient to relatively easily peel off the adhesive material and see the contents of the information underneath it, and also to remove the adhesive material from the adherend. At that time, without damaging the adherend, for example, part of the adhesive material during the mailing of the adherend does not peel off, and is adhered with an appropriate and stable adhesive force, It is to provide a patch.

(Means for Solving the Problem) The present invention is directed to a base material, a difficult-to-adhere layer formed on at least a part of the surface of the base material, and an adhesive strength adjustment formed on a part of the surface of the difficult-to-adhere layer. Layer, and a heat-adhesive resin layer formed on the surface of the adhesive force adjusting layer, in a portion where the adhesive force adjusting layer is not formed, a part of the heat-adhesive resin layer is in contact with the difficult adhesive layer. The hard-to-adhere layer and the heat-adhesive resin layer are strongly bonded to each other, the hard-to-adhere layer and the adhesive strength adjusting layer are weakly bonded, and the hard-to-adhesive layer and the heat-adhesive resin layer are bonded to each other. It is an adhesive material that adjusts the adhesive strength of.

(Function) The heat-adhesive resin layer formed on the back surface of the adhesive material is heated and pressed on the surface of the adherend to melt the heat-adhesive resin layer and adhere to the adherend. Affixed. An adhesive force adjusting layer is formed between the difficult-to-adhere layer and the heat-adhesive resin layer. The difficult-to-adhere layer is strongly adhered to the heat-adhesive resin layer.
Further, the adhesive force adjusting layer is weakly adhered to the difficult-to-adhere layer. Therefore, the difficult-to-adhere layer and the thermo-adhesive resin layer are strongly adhered,
The difficult-to-adhere layer and the adhesive force adjusting layer are adhered with moderately controlled weak adhesive force. Therefore, the adhesive material is attached to the adherend with an appropriate and stable adhesive force.

Therefore, it is possible to prevent a part of the adhesive material from peeling off during the mailing of the adherend, and the recipient can easily peel off the adhesive material after receiving it.

(Effect of the Invention) According to the present invention, when a thermoadhesive resin is used to adhere an adhesive material to an adherend, the adhesive force adjusting layer is provided between the adhesive material and the thermoadhesive resin layer. Since the adhesive material is formed into a sheet, the adhesive material is attached to an adherend with an appropriate and stable adhesive force.

Therefore, when the adhesive material is peeled from the object to be adhered, the object to be adhered is not damaged, and part of the adhesive material is not peeled off, for example, during mailing of the object to be adhered. .

The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

(Example) This adhesive material is adhered to various adherends. In this example, a case where a postcard is used as an adherend will be described.

FIG. 1 is a perspective view showing an example of use of an adhesive material which is an embodiment of the present invention in a postcard, and FIG. 2 is a partial sectional view taken along line II-II in FIG.

The postcard 10 includes a postcard mount 12 formed into a large postcard, and an adhesive material 14 attached to a part of the postcard mount 12. The adhesive material 14 has a cut line 16 for separation.

The adhesive material 14 to be adhered to the surface of the postcard board 12, particularly to the portion where the image forming portion such as confidential matters such as financial and insurance information is formed, is mainly described with reference to FIG. Explain.

The adhesive material 14 includes a base material 18 formed of a material that is flexible as a comparative example, such as paper or synthetic resin film, and that can be cut by hand, scissors, or the like.

An adhesive layer 20 is formed on one surface of the base material 18. Examples of the adhesive forming the adhesive layer 20 include emulsions such as polyvinyl acetate emulsion, latex adhesives, water-soluble adhesives such as water glass and casein, and solvent-based reactive adhesives such as polyurethane. is there.

A concealing layer 22 is formed on one surface of the adhesive layer 20. The concealing layer 22 is formed by laminating a film material having a concealing force such as aluminum foil with the adhesive force of the adhesive layer 20, but may be formed by printing with a concealing ink, for example.

On the surface of the concealment layer 22, the difficult-to-adhere layer 24 is made of polyethylene,
It is formed by extruding an inert resin having no polar group such as polypropylene and laminating.

The "difficult adhesion" of the difficult-to-adhere layer 24 means that it is adhered to the below-described adhesive force adjusting layer with a moderately controlled weak adhesive force.

The hiding layer 22 may not be formed if the difficult-to-adhere layer 24 is blended with a hiding agent such as carbon black or aluminum powder so as to be hiding.

An adhesive force adjustment layer 26 is formed on a part of the surface of the difficult-to-adhere layer 24.

On the surface of the adhesive strength adjusting layer 26 side of the difficult adhesive layer 24, the difficult adhesive layer 24
The heat-adhesive resin layer 28 by extruding the heat-adhesive resin that adheres to the polyolefin resin while heating, or by dissolving it in a solvent or dispersing it in water and performing printing such as gravure or silk screen.
Is formed.

This heat adhesive resin layer 28 is, for example, 60 ° C. to 200 ° C.
It is softened and melted at the temperature of, and is formed so that it can be completely adhered to the postcard mount 12.

The cut lines 16 are formed slightly inside the left and right ends of the adhesive force adjustment layer 26. In addition, the notch 16 for separation is the base material.
18, adhesive layer 20, hiding layer 22, difficult adhesion layer 24, adhesion adjustment layer 26
And the upper and lower ends of the heat adhesive resin layer 28.

Then, at the tip portion of the adhesive material 14, a linear adhesive portion 30 in which the adhesive force adjustment layer 26 is not formed is formed so that the hard-to-adhere adhesive layer 24 and the thermo-adhesive resin layer 28 are directly adhered in a linear manner. Exists. In the line-shaped adhesive portion 30 where the adhesive force adjustment layer 26 is not formed, the difficult-to-adhere layer 24 and the thermo-adhesive resin layer 28 are strongly adhered. Further, the difficult-to-adhere layer 24 and the adhesive force adjusting layer 26 are adhered with a moderately controlled weak adhesive force. Therefore, the adhesive material 14 can be easily peeled off from the postcard backing paper 12 by separating the adhesive material 14 at the separation cuts 16.

Then, on the surface of the postcard mount 12, an information section 32 in which secret matters and the like are written is formed. In order that the information section 32 can be seen through the thermal adhesive resin layer 28 and the adhesive force adjusting layer 26, the thermal adhesive resin layer 28 and the adhesive force adjusting layer 26 need to be transparent or translucent. There is.

On the surface of the heat-adhesive resin layer 28, the adhesive material 14 is attached to the postcard mount 12.

FIG. 3 shows a state in which the postcard 10 is cut off by the cut line 16 and the adhesive material 14 is peeled off. The information section 32 can be seen through the heat adhesive resin layer 28 and the adhesive force adjusting layer 26.

Examples of the base material 18 include synthetic paper, film of cellophane, polyethylene, polyester, etc., or aluminum foil in addition to the above-mentioned embodiment. When the adhesive material 14 is adhered to the postcard mount 12, In addition, it is preferable to select a relatively soft material so that the adhesive material 14 does not inadvertently delaminate against the adhesive force between the difficult-to-adhere layer 24 and the heat-adhesive resin layer 28.

Further, when a material having excellent hiding property such as aluminum foil is selected as the base material 18, the hiding layer 22 may not be formed as in the above embodiment.

The material of the adhesive force adjustment layer 26 is selected in relation to the difficult adhesion layer 24. For example, when polyethylene is selected as the resin forming the difficult-to-adhere layer 24, the material for the adhesive force adjusting layer 26 may be, for example, polyvinyl methyl ether, polyvinyl ethyl ether, polyvinyl isobuty ether,
Carboxy-modified acrylic resin, polyamide resin, chlorinated polypropylene, ethylene / acrylic acid copolymer, ethylene / vinyl acetate copolymer, ethylene / ethyl acrylate resin, styrene / butadiene / styrene block copolymer, styrene / isoprene / styrene Block copolymer, polyester resin, terpene resin, rosin, ester rosin, hydrogenated rosin, polymerized rosin, butyral resin, petroleum resin, and waxes such as polyethylene wax, paraffin wax, montan wax, microcrystalline wax, and vinyl chloride -Vinyl acetate copolymer, nitrocellulose, etc. can be selected. Then, these single substances or a mixture of two or more types can be coated to form the adhesive force adjusting layer 26.

According to the experiment of the inventor, in the above-mentioned embodiment, the polyolefin resin layer, that is, the difficult-to-adhere layer 24, is coated with a mixed solution of chlorinated polypropylene and vinyl chloride / vinyl acetate copolymer to form the adhesive force adjusting layer 26. When formed and the mixing ratio of them is 40 parts to 240 parts of chlorinated polypropylene to 100 parts of vinyl chloride / vinyl acetate copolymer, the best result is obtained when 120 parts of chlorinated polypropylene is added. Was given.

Further, in the above-mentioned examples, the polyolefin resin layer, that is, the difficult-to-adhere layer 24, is coated with a mixed solution of a block copolymer of styrene / butadiene / styrene and a vinyl chloride / vinyl acetate copolymer to form an adhesive force adjusting layer. Forming 26,
The blending ratio of them is based on vinyl chloride / vinyl acetate copolymer.
When 1 to 40 parts of the styrene / butadiene / styrene block copolymer was used per 100 parts, the best result was obtained when 10 parts of the styrene / butadiene / styrene block copolymer was blended.

As an example of the heat-adhesive resin, an EVA-based adhesive is selected. Its composition is composed of EVA (ethylene-vinyl acetate copolymer resin), tackifier, wax and anti-oxidant, and a plasticizer and a filler may be supplementarily added.

Examples of the tackifier include glycerin ester of partially hydrogenated rosin, glycerin ester of rosin, pentaerythritol modified rosin, petroleum resin, α-methylstyrene / nyltoluene copolymer, terpene oil polymer, and terpene phenol polymer.

Waxes include paraffin wax, microcrystalline wax, low molecular weight polyethylene wax,
Fischer-Tropsch wax, Custer wax,
There are chlorinated paraffin and the like.

Antioxidants include hindered phenolic compounds,
There are salicylic acid compounds, benzophenone compounds, benzotriazole compounds, phosphorus compounds, sulfur compounds, organometallic compounds, and the like.

As the heat-adhesive resin other than the above examples, styrene-
Butadiene-styrene copolymer resin, styrene-isobrene-styrene copolymer resin, polyethylene, ethylene-ethyl acrylate copolymer resin, ethylene-acrylic acid copolymer resin, ethylene-methyl acrylate copolymer resin, ethylene-methyl methacrylate copolymer resin , Ethylene-
Methacrylic acid copolymer resin, ionomer resin, polymethylpentene resin, ethylene-vinyl alcohol copolymer resin, vinylidene chloride resin, vinyl chloride-vinyl acetate copolymer resin, polyamide resin, styrene-acryl copolymer resin, polystyrene resin, polyacrylic acid Copolymer resins, polyester resins, polyurethane resins, waxes and the like can be selected.
When printing or coating them, they may be used as appropriate while heating, or dissolved in a solvent, or dispersed in water.

The adhesive material 14 is attached to the postcard mount 12 by melting the heat adhesive resin layer 28 by heating. Postcard mount
When it is confirmed that the adhesive material 14 has been superposed on the 12 optimal positions, the adhesive material 14 can be heated for the first time, and the adhesive material 14 can be used for the postcard mount 12
Precisely adhered to the optimum position on the surface of. Therefore,
The so-called sticking error that the sticking cannot be made at the correct position unlike the case where the pressure-sensitive adhesive is used does not occur.

Further, since the adhesive material 14 is formed with a cut line 16 for separation, in the unlikely event that the content is seen by a third party who is not a legitimate recipient, the cut line 16 for separation is broken at that time. , The legitimate recipient knows that the content was seen.

According to the present invention, the adhesive force adjustment layer 26 is formed between the adhesive material 14 and the thermoadhesive resin layer 28, and the adhesive material 14 and the thermoadhesive resin layer 28 are strongly adhered to each other. Since the 14 and the adhesive force adjusting layer 26 are adhered with a moderately controlled weak adhesive force, for example, when a postcard is used as the adherend, the adhesive material 14 has a moderately stable adhesive force and the postcard mount 12 Affixed to.

Therefore, the adhesive force is too strong, and when the adhesive material 14 is peeled from the postcard mount 12, the postcard mount 12 is damaged, or the adhesive strength is too weak, and one The part does not come off.

In the above embodiment, the adhesive force adjustment layer 26 is formed in a strip shape at appropriate intervals in the width direction of the base material 18,
For example, as shown in FIG. 4, a portion in which the adhesive force adjusting layer 26 is not formed may be provided in a spot shape near the longitudinal edge of the base material 18. By doing so, the heat-adhesive resin layer 28 is formed in a spot shape in the vicinity of both edges of the base material 18.
The exposed part will be formed, and this adhesive material 14
It is possible to prevent the adhesive material 14 from being inadvertently peeled from the postcard mount 12 from the vicinity of the longitudinal edge of the base material 18 when attached to the postcard mount 12.

FIG. 5 is a cross-sectional view of an essential part showing still another embodiment of the present invention, and FIG. 6 is a view showing the state in which the adhesive material 14 is peeled off from the postcard mount 12 in the embodiment shown in FIG. FIG.

In this embodiment, the adhesive layer 24 and the adhesive force adjusting layer 26 are formed at the tip of the adhesive material 14 so that the heat-adhesive resin layer 28 and the hiding layer 22 are directly adhered in a line. There is no line-shaped adhesive portion 30. In the line-shaped adhesive portion 30 where the difficult-to-adhere adhesive layer 24 and the adhesive force adjusting layer 26 are not formed,
The heat adhesive resin layer 28 and the hiding layer 22 are strongly adhered. Further, the difficult-to-adhere layer 24 and the adhesive force adjusting layer 26 are adhered with a moderately controlled weak adhesive force. Even with such a configuration, the adhesive material 14 can be easily peeled off from the postcard mount 12 by cutting at the cut lines 16 for cutting.

FIG. 7 is a cross-sectional view of essential parts showing another embodiment of the present invention. In this embodiment, in particular, at the upper and lower ends of the base material 18, the adhesive layer 20, the hiding layer 22, the difficult-to-adhere layer 24, the adhesive force adjusting layer 26 and the heat-adhesive resin layer 28, and at the edges of the adhesive force adjusting layer 26. Along with this, a cut line 16a for cutting and a cut line 16b for cutting are formed, and a cut line 16c for cutting is formed inside the cut line 16a for cutting.

In the embodiment shown in FIG. 7, the cut lines 16a and 1
The base material 18 between 6c is designed to be detachable as shown in FIG. The cut lines 16a and 1
The tip of the base material 18 between 6c may be formed with a recess for easy hooking of a finger or a nail, or may be formed with a convex shape for easy picking with a finger.

FIG. 9 is a main part plan view showing still another embodiment of the present invention. In this embodiment, in particular, a large number of cuts 34 are formed along the periphery of the adhesive material 14. The cuts 34 are aligned with each other when viewed in the direction of peeling the adhesive material 14.
It is composed of a linear cut portion 36a and a circular cut portion 36b so that a part of 34 overlaps. If you do this,
The central portion of the adhesive material 14 is easily peeled off.

FIG. 10 is a plan view of essential parts showing a modification of the embodiment shown in FIG. In this embodiment, in particular, when the adhesive material 14 is viewed in the peeling direction, a part of the cut lines 34 that are aligned with each other overlap,
Linear cuts 34 are obliquely formed around the base material 18.
Even in this case, the central portion of the adhesive material 14 can be easily peeled off. In the embodiment shown in FIG. 9, a postcard mount
Although the adhesive material 14 is adhered to a part of 12, the adhesive material 14 may be adhered to the entire postcard mount 12 as in this embodiment.

In this embodiment, the case where a postcard is used as the adherend is described, but the adhesive material 14 can be adhered to various other adherends.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a usage example of an adhesive material which is an embodiment of the present invention in a postcard, and FIG. 2 is a partial cross-sectional view taken along line II-II in FIG. FIG. 3 is a partial cross-sectional view showing a state in which the adhesive material is peeled off from the postcard mount. FIG. 4 is a perspective view showing another embodiment of the present invention. FIG. 5 is a cross-sectional view of an essential part showing still another embodiment of the present invention, and FIG. 6 is a cross-sectional view of an essential part showing a state in which the adhesive is peeled off from the postcard mount in the embodiment shown in FIG. It is a figure. FIG. 7 is a cross-sectional view of the essential parts showing another embodiment of the present invention, and FIG. 8 is a cross-sectional view of the essential parts showing a state in which the adhesive is peeled off from the postcard mount in the embodiment shown in FIG. Is. FIG. 9 is a main part plan view showing still another embodiment of the present invention. FIG. 10 is a plan view of essential parts showing a modification of the embodiment shown in FIG. FIG. 11 is a partial sectional view of a postcard in which a conventional adhesive material of this type is used. In the figure, 14 is an adhesive material, 18 is a base material, 24 is a difficult-to-adhere layer, 26
Indicates an adhesive force adjusting layer, and 28 indicates a thermo-adhesive resin layer.

Claims (1)

(57) [Claims] 1. A base material, a difficult-to-adhere layer formed on at least a part of the surface of the base material, and an adhesive force adjusting layer formed on a part of the surface of the difficult-to-adhere layer.
And a thermoadhesive resin layer formed on the surface of the adhesive strength adjustment layer, wherein a part of the thermoadhesive resin layer is in contact with the difficult-to-adhesive layer in a portion where the adhesive strength adjustment layer is not formed. The hard-to-adhere layer and the heat-adhesive resin layer are strongly bonded, the hard-to-bond layer and the adhesive force adjusting layer are weakly bonded, and the hard-adhesive layer is the hard adhesive layer. An adhesive material for adjusting the adhesive force between the adhesive layer and the heat-adhesive resin layer.