JPH04324488A - Sticking material - Google Patents

Abstract

PURPOSE:To properly and temporarily hide the surface of a material to be stuck without treating the surface and to inhibit the curl of the material to be stuck by forming first and second thermally adhesive resin layers with thermally adhesive resins each having delayed tacky property. CONSTITUTION:A primer layer 20 is formed on the principal face of a base material 16. A first thermally adhesive resin layer 22 made of a thermally adhesive resin having delayed tacky property and low adhesive strength is formed on the surface of the primer layer 20. A second thermally adhesive resin layer 24 made of a thermally adhesive resin having delayed tacky property and high adhesive strength is further formed on part of the surface of the first layer 22.

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. 10 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.

[0006] Furthermore, a laminate formed in such a way that a part of it, for example, the part inside the frame, can be peeled off,
Dry glue is applied over the entire surface of the paper to form an adhesive surface, and the other base material is subjected to a release process such as silicone processing so that only the area within the frame can be removed. There is a need to allow one laminate of a laminate structure to be partially peeled off by treatment. Therefore, when manufacturing them, one laminate requires a dry glue application process, and the other laminate requires a peeling process such as silicon processing.
Inevitably, the structure of the laminate becomes more complicated, and the number of manufacturing steps increases, leading to an increase in manufacturing costs.

[0007] Therefore, the main object of the present invention is to be able to suitably and temporarily hide the surface of an adhered material without subjecting the surface of the adhered material to any processing such as peeling treatment, and to It is an object of the present invention to provide an adhesive material in which a material to be adhered does not easily curl even when a thermoadhesive resin is used as an agent.

[0008]

[Means for Solving the Problems] The present invention includes a sheet base material, a primer layer formed on one main surface of the sheet base material,
A first heat-adhesive resin layer formed on the surface of the primer layer and made of a delayed-tack heat-adhesive resin and having weak adhesive strength; This adhesive material is made of a delayed tack thermoadhesive resin and includes a second thermoadhesive resin layer having strong adhesive strength.

[0009]

[Function] Since the first heat-adhesive resin layer and the second heat-adhesive resin layer are made of delayed-tack heat-adhesive resin, after heating the adhesive material, It can be attached to.

[0010] The first thermoadhesive resin layer is weakly adhered to the material to be adhered, and the second thermoadhesive resin layer is strongly adhered to the material to be adhered. Further, the primer layer serves to strengthen the adhesive force of the first thermoadhesive resin layer. Therefore, the first thermoadhesive resin layer is strongly adhered to the sheet base material.

[0011]

According to the present invention, the surface of the adhered material can be suitably and temporarily hidden without subjecting the surface of the adhered material to any processing such as peeling treatment. 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.

[0013]

[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.

FIGS. 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.

The postcard 10 includes a postcard mount 12 formed to the size of an official postcard and a covering material 14 attached to a portion of the postcard mount 12.

Further, on the surface of the postcard mount 12, there are formed lottery parts 12a such as winnings and losers, and secret information 12b such as financial and insurance information. The lottery portion 12a and the secret information 12b are formed by, for example, printing on the surface of the postcard mount 12. In addition, this lottery section 12a and confidential information 12b
may be formed by handwriting, for example.

[0017] Then, the lottery section 12 of this postcard mount 12
A covering material 14 is attached to the surface including the confidential information 12b and the confidential information 12b.

Next, this covering material 14 will be explained based mainly on FIG. 2.

This covering material 14 includes a sheet-like base material 16. As shown in FIG. 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.

A concealing layer 18 is formed on one main surface of the base material 16. The hiding layer 18 is formed, for example, by solid silver printing using silver ink, or by laminating film materials having hiding power such as aluminum foil with an adhesive or the like.

[0021] The surface of this hiding layer 18 has a first layer described below.
A primer layer 20 is formed to strengthen the adhesive force of the thermoadhesive resin layer 22. This primer layer 20 is formed on the surface of the hiding layer 18.

Examples of the primer forming the primer layer 20 include alkyl titanates, polyethyleneimines, polyisocyanates, silicon coupling agents, and the like.

Further, on the surface of the primer layer 20, a thermoadhesive resin having delayed tack properties and weak adhesive strength is coated by extrusion while heating, or by dissolving it in a solvent or dispersing it in water to form a gravure or The first thermoadhesive resin layer 22 is formed by printing such as silk screen.

[0024] This first thermoadhesive resin layer 22 is formed so that it can be melted at a temperature of, for example, 100°C to 200°C, and can be adhered to the postcard mount 12 made of, for example, paper with a weak adhesive force. There is.

[0025] 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.

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, resin acid dimer), and the like.

Furthermore, a second thermoadhesive resin layer 24 having strong adhesive strength is formed on the surface of the first thermoadhesive resin layer 22. In this embodiment, the second thermoadhesive resin layer 24 is formed with a constant width on both sides of the postcard mount 12 in the longitudinal direction, that is, on both the upper and lower ends of the covering material 14. Further, the second thermoadhesive resin layer 24 is formed in a spot shape on both sides of the postcard mount 12 in the width direction, that is, on both left and right ends of the covering material 14 . The second heat-adhesive resin layer 24 is formed by partially applying a heat-adhesive resin having strong adhesive strength to the surface of the first heat-adhesive resin layer 22 . In this case, the thermoadhesive resin material with strong adhesive strength may contain more tackifier or no release agent than the thermoadhesive resin material with weak adhesive strength. . In addition,
The second thermoadhesive resin layer 24 overlaps the first thermoadhesive resin layer 24 only at both upper and lower ends and at both left and right ends of the covering material 14.
It may be formed on the surface of the covering material 14, or it may be formed in a belt-like frame shape with a certain width apart from the periphery of the covering material 14. in this case,
The second thermoadhesive resin layer 24 may be formed with a constant width or may be formed in a spot shape.

As shown in FIGS. 3 and 4, the covering material 14
The base material 16, the hiding layer 18, the primer layer 20, and the first thermoadhesive resin layer 22 were cut in the area where the second thermoadhesive resin layer 24 was not formed, and compared from the postcard mount 12. It can be easily peeled off. The surface of the postcard mount 12 can then be seen.

[0032] In the adhesive material of the present invention, the first heat-adhesive resin layer 22 and the second heat-adhesive resin layer 24 are formed of a delayed tack adhesive and have adhesive properties as a pressure-sensitive adhesive. Delayed tack adhesive is a type of hot melt adhesive and has a long open time. Therefore, after heating the coating material 14, the postcard mount 1
It can be attached to 2.

FIG. 5 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 covering material 14 is unraveled at one end and sent into the dryer 27. The coating material 14 is then heated in the dryer 27. Dressing material 14 is then cut at the location of arrow A and further suctioned into vacuum device 28 . Further, the covering material 14 is stuck to the postcard mount 12 between the vacuum device 28 and the pressure roller 29.

[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.

FIG. 6 is a partial cross-sectional view showing another embodiment of the present invention. In this embodiment, in particular, the other main surface of the base material 16 is coated with an anti-curl agent to form an anti-curl layer 30, and the surface of the hiding layer 18 is laminated with, for example, polyethylene or polypropylene using a T-die method. , a laminate layer 32 is formed. The base material 16 is then dimensionally stabilized by a dimension stabilizer.

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.

[0037] These are coated or impregnated singly or as a mixture of two or more, or together with a crosslinking agent, and the substrate 1 is coated or impregnated.
Stabilize the dimensions of 6. Examples of crosslinking agents include epoxy resins, glyoxal, aminoaldehyde resins, zirconium carbonate salts, and the like.

FIG. 7 shows a laminate layer 32 using the T-die method.
FIG. Laminate layer material 3
2a is thinned by a T-die 33 to form a laminate layer 32.

The anti-curl layer 30 is formed to prevent curling. That is, since the hiding layer 18, the laminate layer 32, the first thermally adhesive resin layer 22, and the second thermally adhesive resin layer 24 are formed, when paper is used as the base material 16, for example, the base material 16 Expansion and contraction of the surface on the hidden layer 18 side is prevented. Therefore, the hiding layer 1 of the base material 16
When the paper constituting the base material 16 absorbs and releases moisture from the surface opposite to the side 8, the paper expands and contracts, causing curling. Therefore, by eliminating or minimizing the change in the moisture content of the paper that constitutes the base material 16,
Formed to prevent curling. 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 a mixture of two or more,
The anti-curl layer 30 is formed by coating or impregnation. Further, as the anti-curl layer 30, on the surface of the base material 16 on the side opposite to the hiding layer 18 side, like the laminate layer 32,
It may also be formed by laminating polyethylene.

Furthermore, if a non-stretchable material such as a resin film is used as the base material 16, shrinkage of the hiding layer 18, the first thermoadhesive resin layer 22, and the second thermoadhesive resin layer 24 may occur. As a result, curling occurs on the hiding layer 18 side of the base material 16. 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 30 is formed, and the function of the anti-curl layer 30 cancels out and prevents curling.

[0041] The base material 16 has a tendency for heat to escape easily at the surface, and the surface tends to shrink easily. However, in this embodiment, the substrate 16 is dimensionally stabilized by the dimensional stabilizer, so that its surface is less likely to shrink during manufacturing and application of the covering material 14. Furthermore, since the anti-curl layer 30 is formed by coating the other 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.

[0042] When covering confidential information such as bank account balances formed on a part of the surface of a postcard, the base material 16, concealing layer 18, primer layer 20 and first thermoadhesive resin layer 22 are coated. A cut that can be separated,
The base material 16, the hiding layer 18, the primer layer 20, and the first thermoadhesive resin layer 22 are formed as appropriate, and the base material 1 is formed at the cut line.
6. The hiding layer 18, the primer layer 20, and the first thermoadhesive resin layer 22 may be formed so that they can be separated from the postcard mount 12. 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. 8, one cut 34 is formed into a straight cut portion 36 so that adjacent cuts 34 partially overlap when viewed in the direction in which the covering material 14 is peeled off.
a and the arc-shaped cut portion 36b, the covering material 1
4 can be easily peeled off. In addition,
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.
The linear cuts 34 may be formed diagonally around the base material 18 so that they partially 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 state in which the covering material is peeled off from the postcard mount.

FIG. 4 is a sectional view taken along line IV-IV in FIG. 3;

FIG. 5 is an illustrative view showing an example of a method for attaching a covering material to a postcard mount.

FIG. 6 is a partial sectional view showing another embodiment of the invention.

FIG. 7 is a perspective view showing a method of forming a laminate layer using a T-die method.

FIG. 8 is a surface view of a main part showing still another embodiment of the present invention.

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

FIG. 10 is a sectional view showing a conventional adhesive material.

[Explanation of symbols]

14 Covering material 16 Base material 20 Primer layer 22 First thermal adhesive resin layer 24 Second thermal adhesive resin layer

Claims (1)

[Claims] 1. A sheet base material, a primer layer formed on one main surface of the sheet base material, and a delayed tack thermoadhesive resin formed on the surface of the primer layer,
a first heat-adhesive resin layer having a weak adhesive force; and a second heat-adhesive resin layer formed on a part of the surface of the first heat-adhesive resin layer and made of a delayed-tack heat-adhesive resin and having a strong adhesive force. An adhesive material comprising a heat-adhesive resin layer of No. 2.