JPH04324480A - Sticking material - Google Patents

Abstract

PURPOSE:To obtain a sticking material capable of properly and temporarily hiding the surface of a material to be stuck without treating the surface and hardly curling the material to be stuck at the time of sticking even when a thermally adhesive resin is used as an adhesive by forming a specified thermally adhesive resin layer on the principal face of a hiding layer. CONSTITUTION:A hiding layer 20 is formed on one principal face of a base material 16 by solid silver printing with silver ink. A laminated layer 22 is formed on the surface of the hiding layer 20 by laminating PE or PP by a T die system. A thermally adhesive resin layer 24 is further formed on the surface of the laminated layer 22 by extrusion coating with a thermally adhesive resin having delayed tacky property under heating or by gravure or silk screen printing with the resin dissolved in a solvent or dispersed in water.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive material, and more particularly to an adhesive material that can be applied to, for example, a portion where confidential information is written to temporarily hide that portion.

0002

2. Description of the Related Art FIG. 9 is a sectional view showing a conventional adhesive material. This adhesive material 1 includes a sheet-like base material 2. A concealing layer 3 is formed on the main surface of the base material 2 . A laminate layer 4 made of polyethylene is formed on the surface of this hiding layer 3. Furthermore, an adhesive layer 5 made of a pressure-sensitive adhesive is formed on the surface of the laminate layer 4. A release paper 6 is temporarily attached to the main surface of the adhesive layer 5.

0003

[Problem to be Solved by the Invention] With such conventional adhesive materials, if it is applied to the surface of the material to be pasted, the surface of the material to be pasted can be hidden, but the surface of the material to be pasted can be hidden. There were cases in which mistakes were made in pasting onto the material to be pasted.

[0004] In order to solve this problem, an adhesive material using a thermoadhesive resin as an adhesive has been developed. After confirming the positions of the adhesive material and the material to be adhered, such an adhesive material is adhered to the material by melting the heat-adhesive resin layer. Therefore, when the adhesive material is applied to the material to be adhered, it is difficult to make an adhesion error.

However, when such an adhesive material is attached to a target material, the target material is also heated when the thermoadhesive resin layer is heated, causing the target material to curl. There were cases where it was put away.

Therefore, the main object of the present invention is to be able to suitably and temporarily hide the surface of an adhered material without processing the surface of the adhered material, and to use thermal adhesive as an adhesive. To provide an adhesive material in which a material to be adhered is not easily curled during application even when a synthetic resin is used.

[0007]

[Means for Solving the Problems] The present invention provides a sheet base material, a concealing layer formed on the main surface of the sheet base material and having a concealing property, and a delayed tack thermal adhesive formed on the main surface of the concealing layer. This adhesive material includes a thermoadhesive resin layer made of a synthetic resin.

[0008]

[Function] Since the thermoadhesive resin layer is formed of a delayed tack thermoadhesive resin layer, the adhesive material can be heated and then applied to the material to be adhered.

[0009]

According to the present invention, the surface of the material to be adhered can be suitably and temporarily hidden without processing the surface of the material. Furthermore, even if a thermoadhesive resin is used as an adhesive in the adhesive material, the material to be adhered is unlikely to curl during attachment.

The above objects, 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.

[0011]

[Example] The present invention relates to an adhesive material that is applied to the surface of a material to be adhered, such as a postcard mount. I will explain about it.

1 and 2 show a postcard according to an embodiment of the present invention, FIG. 1 being a perspective view thereof, and FIG. 2 being a sectional view taken along line II--II in FIG. 1.

The postcard includes a postcard material 10, and the postcard material 10 includes a postcard mount 12 formed to the size of an official postcard and a covering material 14 stuck to a part of the postcard mount 12.

Next, the covering material 14 that is pasted on the surface of the postcard mount 12, particularly in areas where confidential matters are written, such as information on finance or insurance, will be explained mainly based on FIG. do.

The coating material 14 includes a sheet-like base material 16 that is dimensionally stabilized with a dimension stabilizer. The base material 16 is made of a relatively flexible material such as paper or synthetic resin film that can be cut with scissors or the like.

Examples of dimensional stabilizers include butadiene-
Latices such as styrene latex, butadiene-acrylonitrile latex, butadiene-methyl methacrylate latex, chloroprene latex, vinylidene chloride latex, acrylate latex, water-soluble thermosetting resins such as urea resin, melamine resin, phenol resin, PVA (polyvinyl alcohol), etc. Examples include solvent-based resins such as polyester resin, vinyl chloride resin, and shellac resin.

[0017] These are coated or impregnated singly or as a mixture of two or more, or together with a crosslinking agent, and the base material 1
Stabilize the dimensions of 6. Examples of crosslinking agents include epoxy resins, glyoxal, aminoaldehyde resins, zirconium carbonate salts, and the like.

An anti-curl layer 18 is formed on one main surface of the base material 16 by coating an anti-curl agent.

A concealing layer 20 is also formed on the other main surface of the base material 16. The hiding layer 20 is formed by solid silver printing using silver ink, for example, and
Alternatively, it may be formed by laminating film materials with hiding power such as aluminum foil with an adhesive or the like.

A laminate layer 22 is formed on the surface of the concealing layer 20 by laminating, for example, polyethylene or polypropylene using a T-die method.

Furthermore, the surface of the laminate layer 22 is coated with a thermally adhesive resin having delayed tack properties by extrusion while heating, or by dissolving it in a solvent or dispersing it in water for printing such as gravure or silk screen printing. By doing so, a thermal adhesive resin layer 24 is formed.

[0022] This thermal adhesive resin layer 24 has a thickness of, for example, 10
It is formed so that it melts at a temperature of 0° C. to 200° C. and can be adhered to a postcard mount 12 made of paper, for example.

[0023] The thermoadhesive resin has delayed tack properties and basically consists of a polymer and a solid plasticizer,
It preferably contains a tackifier, and may further contain an anti-aging agent and other additives.

Examples of polymers include polyvinyl acetate, polybutyl methacrylate, vinyl chloride-vinylidene chloride copolymer, synthetic rubber, vinyl acetate-2-ethylhexyl allylate copolymer, vinyl acetate-ethylene copolymer, vinylpyrrolidone-styrene copolymer. , styrene-butadiene copolymer, vinylpyrrolidone-ethyl acrylate copolymer, etc. can be selected.

Solid plasticizers include crystallized plasticizers and amorphous plasticizers. Crystallized solid plasticizers do not have tackiness. On the other hand, amorphous solid plasticizers have adhesive properties.

Such solid plasticizers include dicyclohexyl ortho-phthalate, diphenyl ortho-phthalate, dihexyl ortho-phthalate, dihydroabiethyl ortho-phthalate, dimethyl isophthalate, sterulose benzoate, ethylene glycol dibenzoate, Trimethylolethane tribenzoate, glyceride tribenzoate, pentaerythritol tetrabenzoate, sterulose octaacetate, tricyclohexyl citrate, N-cyclohexyl-p-toluenesulfonamide, dehydroabiethylamine carbonate, methoxyethyl-urea stearate There are complexes, etc.

[0027] Examples of the tackifier include indene resin, ethyl cellulose, petroleum resin (hydrocarbon resin), terpene resin, and rosin derivatives (polymerized rosin, hydrogenated rosin, pentaerythritol ester of rosin, and resin acid dimer).

FIG. 3 shows a laminate layer 22 using the T-die method.
FIG. Laminate layer material 2
2a is thinned by a T-die 25 to form a laminate layer 22. If the melting temperature is increased at this time,
The viscosity of the laminate layer 22 decreases and its adhesiveness increases. Further, when the melting temperature is lowered, the viscosity of the laminate layer 22 increases and the adhesiveness decreases. In this way, by controlling the melting temperature in the T-die method, the adhesiveness between the laminate layer 22 and the hiding layer 20 is controlled.

The anti-curl layer 18 is formed to prevent curling. That is, since the hiding layer 20, the laminate layer 22, and the thermal adhesive resin layer 24 are formed,
When paper is used as the base material 16, for example, expansion and contraction of the surface of the base material 16 on the hiding layer 20 side is prevented. Therefore, when the paper constituting the base material 16 absorbs and releases moisture from the surface of the base material 16 on the side opposite to the concealing layer 20 side, the paper expands and contracts, causing curling. Therefore, the paper forming the base material 16 is formed in such a way that curling can be prevented by eliminating or minimizing the change in moisture content. As the anti-curl agent, acrylic emulsion, vinylidene chloride resin, polyethylene emulsion, wax such as paraffin wax, microcrystalline wax, metal soap, etc. are used in the form of an emulsion or in the form of heat melting. These alone or
The anti-curl layer 18 is formed by mixing two or more types and coating or impregnating the mixture. Further, the anti-curl layer 18 may be formed by laminating polyethylene on the surface of the base material 16 on the side opposite to the concealing layer 20 side, similarly to the laminate layer 22.

Furthermore, if a non-stretchable material such as a resin film is used as the base material 16, the shrinkage of the hiding layer 20 and the thermoadhesive resin layer 24 may cause curls on the hiding layer 20 side of the base material 16. Occur. Therefore, as the anti-curl agent, water-soluble polymers such as polyvinyl alcohol, polyethylene oxide, and polyvinyl methyl ether, natural polymers such as starch and casein, latex, and aminoaldehyde resins are used. By coating these, an anti-curl layer 18 is formed, and an anti-curl layer 1
8 cancels out and prevents curls.

As shown in FIGS. 4 and 5, the covering material 14
The base material 16, the anti-curl layer 18 and the hiding layer 20
can be cut and peeled off from the postcard mount 12 relatively easily. The surface of the postcard mount 12 can then be seen.

[0032] In the adhesive material of the present invention, the thermoadhesive resin layer 2
4 is made of delayed tack adhesive and has adhesive properties as an adhesive. Delayed tack adhesive is a type of hot melt adhesive and has a long open time. Therefore, after heating the coating 14,
It can be attached to the postcard mount 12.

FIG. 6 shows a postcard mount 1 of such a covering material 14.
FIG. First, the covering material 14 is held on the holding reel 26. The dressing 14 is unwound at one end and fed into the dryer 28. The coating material 14 is then heated in the dryer 28. The dressing 14 is then cut at the location of arrow A and further suctioned into the vacuum device 30. Further, the covering material 14 is adhered to the postcard mount 12 between the vacuum device 30 and the pressure roller 32.

[0034] In this way, since the covering material 14 is attached to the postcard mount 12 after being heated, no heat is applied to the postcard mount 12, and the postcard mount 12 is less likely to curl.

Furthermore, the base material 16 tends to allow heat to escape easily at the surface, and the surface tends to shrink easily. However, since the base material 16 of this example is dimensionally stabilized with a dimensional stabilizer, when manufacturing and applying the covering material 14,
Its surface does not shrink easily. Furthermore, since the anti-curl layer 20 is formed by coating one main surface of the base material 16 with an anti-curl agent, the covering material 14 is less likely to curl during its manufacture and attachment.

Note that when covering confidential information such as bank account balances formed on a part of the surface of a postcard, a cut is made so that the base material 16, anti-curl layer 20 and concealing layer 22 can be separated. The base material 16, the anti-curl layer 20, and the concealing layer 22 may be appropriately formed so that the base material 16, the anti-curl layer 20, and the concealing layer 22 can be separated from the postcard mount 12 at the cut line. For example, if a cut is made along the periphery of the substrate, only the central portion of the dressing can be removed. In this case, as shown in FIG.
If the two cuts 34 are composed of a straight cut portion 36a and an arcuate cut portion 36b, the central portion of the covering material 14 can be easily peeled off. Note that in order to be able to easily peel off the central portion of the covering material in this way, for example, as shown in FIG. Each linear cut 34 may be formed diagonally around the base material 16 so that the portions overlap.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG. 1;

FIG. 3 is a perspective view showing a method of forming a laminate layer using a T-die method.

FIG. 4 is a perspective view showing a state in which the covering material is peeled off from the postcard mount.

FIG. 5 is a sectional view taken along line V-V in FIG. 4;

FIG. 6 is an illustrative view showing an example of a method for attaching a covering material to a postcard mount.

FIG. 7 is a surface view of main parts showing another embodiment of the present invention.

8 is a surface view of a main part showing a modification of the embodiment in FIG. 7; FIG.

FIG. 9 is a sectional view showing a conventional adhesive material.

[Explanation of symbols]

14 Covering material 16 Base material 20 Hidden layer 24 Heat adhesive resin layer

Claims (1)

[Claims] 1. A sheet base material, a concealing layer formed on the main surface of the sheet base material and having a concealing property, and a thermal adhesive formed on the main surface of the concealing layer and made of a delayed tack thermoadhesive resin. Adhesive material containing a resin layer.