JPH04324486A - Sticking material - Google Patents

Abstract

PURPOSE:To enable simple stripping and to inhibit curl at the time of sticking. CONSTITUTION:A releasing agent layer 24 is formed on at least part of the surface of a base material 18 and an adhesive strength regulating layer 26 is formed on the principal face of the releasing agent layer 24. A thermally adhesive resin layer 28 made of a thermally adhesive resin having delayed tacky property is further formed on the principal face of the regulating layer 26. When the resulting sticking material 14 is stuck to a material to be stuck with the thermally adhesive resin, it is slowly and easily stripped. Since the thermally adhesive resin layer 28 is made of the thermally adhesive resin having delayed tacky property, the material to be stuck curls hardly.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to an adhesive material, which is applied to a material such as a postcard to hide confidential information so that an authorized recipient can see the confidential information as appropriate. Regarding adhesive materials that can be used.

0002

[Prior Art] For example, an adhesive material that is attached to a material to be attached such as a postcard is used to hide a column for writing confidential information so that the authorized recipient can see the contents relatively easily. being developed.

FIG. 17 is a partial cross-sectional view showing an example of the use of a conventional adhesive material for postcards. This postcard 1 includes a postcard mount 2 formed to the size of an official postcard and an adhesive 3 stuck 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 base material 4 . A concealing layer 6 made of aluminum is formed on one main surface of the adhesive layer 5. The base material 4 and the hiding layer 6 are the adhesive layer 5
glued by. A release agent layer 7 is formed on one main surface of the hiding layer 6. A thermoadhesive resin layer 8 is formed on one main surface of the release agent layer 7 . A postcard mount 2 is formed on one main surface of the thermoadhesive resin layer 8 . The thermoadhesive resin layer 8 melts when heated, and the adhesive material 3 is adhered to the postcard mount 2.

0004

[Problems to be Solved by the Invention] However, although conventional adhesive materials have various advantages, they tend to come off easily and are difficult to remove.

[0005] Furthermore, when such an adhesive material is attached to a material to be bonded, the material to be bonded is also heated when the thermoadhesive resin layer is heated, causing the material to curl. There were cases where it was put away.

[0006] Therefore, the main object of the present invention is to allow the authorized recipient to relatively easily peel off the adhesive material and see the information content underneath, and yet, when removing the adhesive material, To provide an adhesive material that gradually peels off and is easy to peel off, and that does not cause curling of the material to be adhered even when a heat-adhesive resin is used as an adhesive.

[0007]

[Means for Solving the Problems] The present invention comprises a base material, a release agent layer formed on at least a part of the surface of the base material, and an adhesion adjustment layer formed on the main surface of the release agent layer. , an adhesive material comprising a thermoadhesive resin layer formed on the main surface of the adhesive force adjustment layer and made of a delayed tack thermoadhesive resin.

[0008]

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

[0009] Furthermore, between the adhesive material and the thermoadhesive resin layer,
Since the adhesive force adjustment layer is formed, when the adhesive material is peeled off from the adhered material, it will gradually peel off and be easily peeled off.

0010

Effects of the Invention According to the present invention, when a thermoadhesive resin is used to attach an adhesive material to a target material, when the adhesive material is peeled off from the target material, the adhesive strength is reduced. Since the adjustment layer is formed between the adhesive material and the thermoadhesive resin layer, it gradually peels off and is easy to peel off. Furthermore, the material to be adhered is less likely to curl during adhesion.

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.

0012

[Example] This adhesive material can be applied to various types of materials, but in this example, a case where a postcard is used as the material to be adhered will be described.

FIG. 1 is a perspective view showing an example of the use of an adhesive material according to 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 to the size of an official postcard and an adhesive 14 attached to a portion of the postcard mount 12. A cutting cut 16 is formed in this adhesive material 14.

FIG. 2 mainly shows the adhesive material 14 that is pasted on the surface of the postcard mount 12, especially in the area where the line-forming part for secret matters such as information on finance and insurance is formed. The explanation will be based on.

The adhesive material 14 includes a base material 18 made of a relatively flexible material such as paper or synthetic resin film that can be cut by hand or with scissors.

An adhesive layer 2 is provided on one main surface of the base material 18.
0 is formed. 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. be.

A concealing layer 22 is formed on one main surface of the adhesive layer 20. The hiding layer 22 is formed by laminating film materials having a hiding power such as aluminum foil with the adhesive strength of the adhesive layer 20, but may also be formed by printing with a masking ink, for example.

A release agent layer 24 is formed on a part of the surface of the concealing layer 22 by coating it with a release agent. As the release agent, for example, polyethylene is selected due to its relationship with the material of the adhesive force adjustment layer 26, which will be described later.
Examples include long-chain alkyl group-containing polymers, silicone polymers, perfluoro-based polymers, and mixtures of polymers and long-chain alkyl group-containing compounds.

Examples of long-chain alkyl group-containing polymers include:
Examples include polystearyl acrylate, polystearylacrylamide, polyvinyl stearate, polyvinyl stearyl ether, cellulose tristearate, polyvinyl stearyl carbamate, and polystearoyl ethyleneimine.

Examples of silicone polymers include copolymers of phenylmethylsiloxane and dimethylsiloxane,
Examples include a condensate of methylphenylsiloxane having a 2-(2-hydroxyethylthio)ethyl group and an acrylic polymer having an -OH group, a condensate of α,ω-dihydroxypolydimethylsiloxane/triacetoxyvinylsilane/TDI, etc. .

Examples of perfluorinated polymers include poly(
1,1-hydroperfluorohexyl methacrylate)
, poly(N-ethyl, N-perfluorooctane sulfamide ethyl methacrylate), methylolated products of 11 methyl perfluorooctane sulfamide diaminotriazine, and the like.

Examples of mixtures of polymers and long-chain alkyl group-containing compounds include mixtures of stearamide and polyethylene, alkyd resins, and vinyl acetate copolymers.

On the surface of the hiding layer 22 on the side of the release agent layer 24,
An adhesive force adjustment layer 26 is formed.

The main surface of the adhesive force adjustment layer 26 is coated with a thermoadhesive resin having delayed tack properties by extrusion while heating, or by dissolving it in a solvent or dispersing it in water and printing with gravure or silk screen. By doing this, the thermal adhesive resin layer 28 is formed.

This thermal adhesive resin layer 28 has, for example, 60
It softens and melts at temperatures between ℃ and 200℃, making postcard mount 1
2 so that it can be completely adhered to.

[0027] 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.

[0031] 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).

The cutting cuts 16 are formed slightly inside the left and right ends of the release agent layer 24. Further, the cut-off cut 16 includes the base material 18, the adhesive layer 20, the hiding layer 22, the release agent layer 24, the adhesive force adjustment layer 26, and the thermal adhesive resin layer 28.
is formed at both the upper and lower ends of the

[0033] At the tip of the adhesive material 14, the release agent layer 24 is not formed so that the thermal adhesive resin layer 28 and the hiding layer 22 side of the base material 18 are directly bonded in a line shape. A line-shaped adhesive portion 30 is present. In the part where the release agent layer 24 is formed, the base material 18 and the thermally adhesive resin layer 28 are weakly bonded, and in the line-shaped adhesive part 30 where the release agent layer 24 is not formed, the base material 18 and the thermal adhesive resin layer 28 are weakly bonded. Adhesive resin layer 2
8 is strongly adhered to. Therefore, it is sufficient to cut it off at the cutting cut 16.

[0034] On the surface of the postcard mount 12, an information section 32 is formed in which confidential information and the like are written. Note that in order to enable the information section 32 to be seen through the thermal adhesive resin layer 28 and the adhesive force adjustment layer 26, the thermal adhesive resin layer 28 and the adhesive force adjustment layer 26 need to be transparent or translucent. There is.

The adhesive material 14 is adhered to the postcard mount 12 on the surface of the thermoadhesive resin layer 28 .

FIG. 3 shows the cut 1 for cutting off this postcard 10.
6 shows the state in which the adhesive material 14 is peeled off. The information section 32 includes a thermal adhesive resin layer 28 and an adhesive force adjustment layer 26
It is now possible to see through it.

In addition to the above embodiments, examples of the base material 18 include synthetic paper, cellophane, polyethylene, polyester films, and aluminum foil. When you arrive,
It is preferable to select a material that is relatively flexible so that the adhesive material 14 does not inadvertently peel off due to the adhesive force with the adhesive force adjustment layer 26 in the area where the release agent layer 24 is formed.

[0038] Furthermore, if a material with excellent concealment properties such as aluminum foil is selected as the base material 18,
It is not necessary to form the hiding layer 22 as in the previous embodiment.

The material of the adhesive force adjustment layer 26 is the material of the release agent layer 24.
selected in relation to For example, when polyethylene is selected as the resin for forming the release agent layer 24, examples of the material for the adhesive force adjustment layer 26 include polyvinyl methyl ether, polyvinylethyl ether, polyvinyl isobutyl ether, carboxyl-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,
Selectable materials include polymerized rosin, butyral resin, petroleum resin, waxes such as polyethylene wax, paraffin wax, montan wax, and microcrystalline wax, vinyl chloride/vinyl acetate copolymer, and nitrocellulose. Then, the adhesion adjustment layer 26 is coated with these alone or a mixture of two or more of them.
It can be done.

According to the inventor's experiments, in the above embodiment, a mixed solution of chlorinated polypropylene and vinyl chloride/vinyl acetate copolymer was applied to the polyethylene layer, that is, the release agent layer 24, to form an adhesion adjustment layer. 26, and their blending ratio was changed to 100% vinyl chloride/vinyl acetate copolymer.
The best results were obtained when 120 parts of chlorinated polypropylene was blended.

Further, in the above embodiment, the polyethylene layer, ie, the release agent layer 24, contains styrene, butadiene,
A mixed solution of a styrene block copolymer and a vinyl chloride/vinyl acetate copolymer is applied to form the adhesion adjustment layer 26, and the blending ratio is adjusted to 100 parts of the vinyl chloride/vinyl acetate copolymer. On the other hand, when the block copolymer of styrene/butadiene/styrene was used in a range of 1 to 40 parts, the best results were obtained when 10 parts of the block copolymer of styrene/butadiene/styrene was blended.

The adhesive material 14 is adhered to the postcard mount 12 by melting the heat-adhesive resin layer 28 by heating. If the adhesive material 14 is heated only when it is confirmed that the adhesive material 14 is superimposed on the postcard mount 12 at the optimal position, the adhesive material 14 is accurately adhered to the optimal position on the surface of the postcard mount 12. Therefore, so-called pasting errors, such as not being pasted at the correct position, do not occur when pressure-sensitive adhesives are used.

[0043] The adhesive material 14 also has a cutting cut 1.
6 is formed, so even if the contents are seen by a third party who is not the authorized recipient, the cut-off cut 16 will be broken and the authorized recipient will be able to see the contents. I understand.

According to the present invention, since the adhesive force adjustment layer 26 is formed between the adhesive material 14 and the heat-adhesive resin layer 28, when the adhesive material 14 is peeled off from the postcard mount 12, the adhesive force adjustment layer 26 is gradually removed. It peels off and is easy to peel off.

Further, the thermally adhesive resin layer 28 is formed of a 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 adhesive material 14, it can be attached to the postcard mount 12.

FIG. 4 shows a postcard mount 1 of such an adhesive material 14.
FIG. First, the adhesive material 14 is held on the holding reel 34. The adhesive material 14 is unwound at one end and sent into the dryer 36. The adhesive material 14 is then heated in the dryer 36. The adhesive material 14 is then cut at the location indicated by arrow A and further suctioned into the vacuum device 38 . Further, the adhesive material 14 is adhered to the postcard mount 12 between the vacuum device 38 and the pressure roller 40.

[0047] In this way, since the adhesive material 14 is heated and then attached to the postcard mount 12, the postcard mount 12 is not exposed to heat and the postcard mount 12 is less likely to curl.

In the above embodiment, the release agent layer 24 is
The release agent layer 24 is formed in a strip shape at appropriate intervals in the width direction of the base material 18, but the release agent layer 24 is not formed in spots near the longitudinal edges of the base material 18, as shown in FIG. You may provide a section. In this way, a spot-like exposed portion of the adhesive force adjustment layer 26 will be formed near both edges of the base material 18, and when this adhesive material 14 is pasted on the postcard mount 12, In addition, it is possible to prevent the adhesive material 14 from being inadvertently peeled off from the postcard mount 12 near the longitudinal edges of the base material 18.

FIG. 6 is a cross-sectional view of a main part showing still another embodiment of the present invention, and FIG. 7 is a cross-sectional view showing the main part of the embodiment shown in FIG. FIG.

In this embodiment, the release agent layer 24 and the adhesive strength adjustment layer 26 are formed at the tip of the adhesive material 14 so that the thermally adhesive resin layer 28 and the hiding layer 22 are directly adhered in a linear manner. There is a line-shaped adhesive portion 30 that is not formed. Even with such a configuration, the adhesive material 14 can be easily attached to the postcard mount 1 by cutting it off at the cutting cut 16.
It can be peeled off from 2.

FIG. 8 is a sectional view of a main part showing still another embodiment of the present invention. In this embodiment, in particular, along the edges of the release agent layer 24, the upper and lower ends of the base material 18, the adhesive layer 20, the hiding layer 22, the release agent layer 24, the adhesive force adjustment layer 26, and the thermally adhesive resin layer 28 are As a result, a cut-off cut 16a and a cut-off cut 16b are formed, and a cut-off cut 16c is further formed inside the cut-off cut 16a.

In the embodiment shown in FIG.
The base material 18 between 6a and 16c can be separated, as shown in FIG. Note that a recess may be formed at the tip of the base material 18 between the cutting cuts 16a and 16c to make it easier to catch fingers or nails, or a convex piece may be formed to make it easier to pick up with fingers. It's okay.

FIG. 10 is a sectional view of a main part showing another embodiment of the present invention. In this embodiment, in particular, a gap 42 in which the thermal adhesive resin layer 28 and the adhesive strength adjustment layer 26 are not formed is formed from the main surface of the thermal adhesive resin layer 28 to the main surface of the release agent layer 24. .

FIG. 11 shows that in the embodiment shown in FIG.
FIG. 12 is a cross-sectional view of a main part showing a state in which the postcard 10 is cut off at a cut-off cut 16 and the adhesive material 14 is peeled off, and FIG. 12 is a perspective view thereof.

In this embodiment, after peeling off the adhesive material 14 from the postcard mount 12, the authorized recipient opens the gap 42.
You can stamp, write, etc. on the postcard mount 12 through it.
Information can be written on the postcard mount 12.

FIG. 13 is a partial cross-sectional view showing still another embodiment of the present invention. In this embodiment, in particular, the substrate 18
An anti-curl layer 44 is formed by coating the other main surface with an anti-curl agent, and a laminate layer 46 is formed on the surface of the concealing layer 22 by laminating, for example, polyethylene or polypropylene using a T-die method. The base material 18 is then dimensionally stabilized with 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.

[0058] 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 8. Examples of crosslinking agents include epoxy resins, glyoxal, aminoaldehyde resins, zirconium carbonate salts, and the like.

FIG. 14 shows the laminate layer 4 using the T-die method.
FIG. 6 is an illustrative diagram showing a method of forming No. 6; The laminate layer material 46a is thinned by a T-die 48 to form a laminate layer 46.

The anti-curl layer 44 is formed to prevent curling. That is, since the hiding layer 22, the laminate layer 46, and the heat-adhesive resin layer 28 are formed,
When paper is used as the base material 18, for example, expansion and contraction of the surface of the base material 18 on the hiding layer 22 side is prevented. Therefore, when the paper constituting the base material 18 absorbs and releases moisture from the surface of the base material 18 on the side opposite to the concealing layer 22 side, the paper expands and contracts, causing curling. Therefore, the paper forming the base material 18 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 44 is formed by mixing two or more types and coating or impregnating the mixture. Further, the anti-curl layer 44 may be formed by laminating polyethylene on the surface of the base material 18 on the side opposite to the concealing layer 22 side, similarly to the laminate layer 46.

Furthermore, if a non-stretchable material such as a resin film is used as the base material 18, the shrinkage of the concealing layer 22 and the heat-adhesive resin layer 28 may cause curls on the concealing layer 22 side of the base material 18. 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 44 is formed.
Function 4 offsets and prevents curls.

[0062] The base material 18 tends to allow heat to escape easily at the surface, and the surface tends to shrink easily. However, in this embodiment, the base material 18 is dimensionally stabilized by the dimensional stabilizer, so that the surface thereof is less likely to shrink when the adhesive material 14 is manufactured and applied. Further, since the anti-curl layer 44 is formed by coating the other main surface of the base material 18 with an anti-curl agent, the adhesive material 14 is less likely to curl during its manufacture and application.

FIG. 15 is a plan view of a main part showing still another embodiment of the present invention. In this embodiment, in particular, a number of cuts 50 are formed along the perimeter of the adhesive 14. Further, each cut 50 is composed of a linear cut portion 52a and an arc-shaped cut portion 52b so that adjacent cuts 50 partially overlap when viewed in the direction in which the adhesive material 14 is peeled off. . In this way, the central portion of the adhesive material 14 can be easily peeled off.

FIG. 16 is a plan view of essential parts showing a modification of the embodiment shown in FIG. 15. In this embodiment, in particular, linear cuts 50 are formed obliquely around the base material 18 so that adjacent cuts 50 partially overlap when viewed in the direction in which the adhesive material 14 is peeled off. Even in this case, the center portion of the adhesive material 14 can be easily peeled off. In the embodiment shown in FIG. 15, the adhesive material 14 is attached to a part of the postcard mount 12, but as in this embodiment, the adhesive material 14 is attached to the entire postcard mount 12. It's okay.

In this embodiment, a case has been described in which a postcard is used as the material to be adhered, but the adhesive material 14 can be applied to various other materials.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example of the use of an adhesive material, which is an embodiment of the present invention, in a postcard.

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

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 an illustrative view showing an example of a method for attaching an adhesive material to a postcard mount.

FIG. 5 is a perspective view showing another embodiment of the invention.

FIG. 6 is a sectional view of a main part showing still another embodiment of the present invention.

FIG. 7 is a sectional view of a main part of the embodiment shown in FIG. 6, showing a state in which the adhesive material is peeled off from the postcard mount.

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

9 is a cross-sectional view of a main part of the embodiment shown in FIG. 8, showing a state in which the adhesive material is peeled off from the postcard mount.

FIG. 10 is a sectional view of a main part showing another embodiment of the present invention.

FIG. 11 is a sectional view of a main part of the embodiment shown in FIG. 10, showing a state in which the adhesive material is peeled off from the postcard mount.

FIG. 12 is a perspective view of FIG. 11;

FIG. 13 is a partial cross-sectional view showing still another embodiment of the invention.

FIG. 14 is an illustrative view showing a method of forming a laminate layer using a T-die method.

FIG. 15 is a plan view of a main part showing still another embodiment of the present invention.

16 is a plan view of a main part showing a modification of the embodiment shown in FIG. 15. FIG.

FIG. 17 is a partial sectional view of a postcard using a conventional adhesive material of this type.

[Explanation of symbols]

14 Adhesive material 18 Base material 24 Release agent layer 26 Adhesive force adjustment layer 28　Thermoadhesive resin layer

Claims (1)

[Claims] 1. A base material, a release agent layer formed on at least a part of the surface of the base material, an adhesive force adjustment layer formed on the main surface of the release agent layer, and a main surface of the adhesive force adjustment layer. An adhesive material comprising a thermoadhesive resin layer formed on a surface and made of a delayed tack thermoadhesive resin.