JP2007152756A - Information hiding postcard - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable to hide information by such a weak pressure that is at a level of rubbing by a hand without requiring a large scale press-contacting apparatus. <P>SOLUTION: An information hiding postcard has a postcard piece 1 with an information entering region 2, a hiding piece 3 connected to one side of the postcard piece 1 and hiding at least information entering region 2, an adhesive layer consisting of a first adhesive layer 4 formed along a side opposing to a side connected to at least the postcard piece 1 of the hiding piece 3, and a second adhesive layer 5 formed at a position opposing to the first adhesive layer 4 of the postcard piece 1, and a false adhesive layer 6 formed in a region other than the adhesive layer forming region of at least one of the postcard piece 1 and the hiding piece 3. In the information hiding postcard, the adhesive layer is a layer prepared by applying and forming a pressure-sensitive adhesive composition comprising an acrylic-modified natural rubber latex, a peroxide non-vulcanized latex and a synthetic rubber latex. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an information hiding postcard, and more particularly to an information hiding postcard capable of hiding information with low pressure.

  In recent years, “confidential postcards” have been used as means for notifying individual individuals of their deposit status, balance information, pension information, etc. from banks, credit companies, government offices, and the like. The paper used for such confidential postcards is coated with a pressure-sensitive adhesive on its information description surface, and does not adhere at all at low pressures, but is configured to adhere when pressed over a predetermined pressure (patent) References 1, 2).

  However, since the conventional pressure-sensitive adhesive requires a relatively high pressure for bonding, a bonding device such as a dry sealer is required for bonding, and its application is limited.

Japanese Examined Patent Publication No. 5-57117 JP 2001-240833 A

  An object of the present invention is to provide an information concealment postcard which does not require a large-scale crimping apparatus and can conceal information even with a low pressure of rubbing by hand.

  That is, the information concealment postcard of the present invention includes a postcard piece having an information entry area, a concealment piece contiguous to one side of the postcard piece and concealing at least the information entry area, and a concatenation piece connected to at least the postcard piece of the concealment piece. An adhesive layer comprising a first adhesive layer formed along a side facing the formed side and a second adhesive layer formed at a position facing the first adhesive layer of the postcard piece; and the postcard piece; An information concealment postcard having a pseudo adhesive layer formed in a region other than the adhesive layer forming region of at least one of the concealing pieces, wherein the adhesive layer comprises an acrylic-modified natural rubber latex and a pre-peroxide vulcanization It is a layer formed by applying and forming a pressure-sensitive adhesive composition containing latex and synthetic rubber latex.

  The adhesive layer of the information hiding postcard of the present invention can be bonded with low pressure, for example, it can be bonded with a relatively strong rubbing several times using a coin, a nib or the like. Therefore, a pressure bonding device such as a dry sealer is not required for bonding.

  Further, since the adhesive layer of the information concealment postcard of the present invention does not adhere in a normal state, it is not necessary to protect the adhesive layer with a release paper or the like, and cost can be reduced.

  In addition, the adhesive layer of the information hiding postcard of the present invention cannot be peeled off without tearing the base material (postcard piece, hiding piece) once bonded.

  On the other hand, the pseudo-adhesion layer of the information concealment postcard of the present invention can be peeled off after being bonded once. After that, it does not adhere again even if it is pressed again, but peels off without breaking the substrate. It is possible. In addition, the pseudo-adhesive layer formed by the composition in which the adhesive force of the pressure-sensitive adhesive composition forming the adhesive layer is adjusted does not need to be protected with release paper or the like as in the case of the adhesive layer. Is possible. Moreover, since it is transparent and the character etc. which were printed on the base material can be visually recognized and the pseudoadhesion layer itself has printability, it is also possible to print on the surface of the pseudoadhesion layer.

  Hereinafter, the information hiding paper of the present invention will be described with reference to the drawings.

  1A and 1B are diagrams showing an example of a two-fold postcard according to the present invention. FIG. 1A is a plan view, and FIG. 1B is a perspective view showing a state where an information entry area is concealed by a concealing piece. is there.

  In FIG. 1, 1 is a postcard piece having an information entry area 2, 3 is a concealment piece concealed at least on one side of the postcard piece 1, 6 is a pseudo-adhesive layer, and 7 is a fold line, The adhesive layer includes a first adhesive layer 4 and a second adhesive layer 5.

  As shown in FIG. 1, the first adhesive layer 4 is formed along a side facing a side (fold line 7) where the postcard piece 1 and the hiding piece 3 are connected. Although the formation position of the 1st contact bonding layer 4 is not limited to the position shown in FIG. 1, forming in the area | regions other than the area | region facing the information entry area 2 of the concealment piece 3 is preferable. The second adhesive layer 5 is formed at a position facing the first adhesive layer 4 when folded at the fold line 7. The formation position of the second adhesive layer 5 may be a position facing the first adhesive layer 4. For example, when the length of the side perpendicular to the fold line 7 of the concealing piece 3 is longer than that of the postcard piece 1. May be formed on the back side of the postcard piece 1. Since the adhesive layer does not adhere in a normal state, it is not necessary to protect the adhesive layer with release paper or the like.

  The pseudo adhesive layer 6 is formed on almost the entire surface other than the region where the first adhesive layer 4 of the masking piece 3 is formed. The formation position of the pseudo adhesive layer 6 is not limited to the position shown in FIG. 1 and may be provided on the postcard piece 1. Since the pseudo adhesive layer 6 formed of the same composition as the pressure-sensitive adhesive composition forming the adhesive layer does not adhere in a normal state, it is not necessary to protect the pseudo adhesive layer 6 with a release paper or the like.

  In the two-fold postcard of the present invention, the information entry area 2 is concealed by folding the concealment piece 3 along the fold line 7 as shown in FIG. Then, after applying the pressure necessary to bond the pseudo-adhesive layer 6, it is rubbed several times relatively strongly using a coin, a pen tip, etc., centering on the position corresponding to the adhesive layer of the concealing piece 3. The concealing piece 3 is adhered to the postcard piece 1. When the pseudo-adhesive layer 6 is a layer formed of the same composition as the pressure-sensitive adhesive composition that forms the adhesive layer, it is not necessary to use a crimping device, and the concealing piece 3 is attached to the postcard piece 1 with low pressure. Can be glued to.

  The masking piece 3 can be peeled off, and once peeled off, it does not adhere again even if it is pressurized again. Moreover, when the masking piece 3 is peeled off, the portion of the pseudo adhesive layer 6 can visually recognize the information written in the information writing area 2 without breaking the postcard piece 1 and the masking piece 3. On the other hand, the portion of the adhesive layer cannot be peeled without breaking the postcard piece 1 or the concealing piece 3. . Therefore, it is possible to prevent the concealing piece 3 from being peeled off intentionally or mistakenly during mailing. It should be noted that a portion where the first adhesive layer 4 and the second adhesive layer 5 are bonded in advance by, for example, providing a cut perforation so that the concealing piece 3 can be peeled without breaking the postcard piece 1 or the concealing piece 3 itself. It may be separated.

  The adhesive layer is a layer formed by applying and forming a pressure-sensitive adhesive composition containing an acrylic-modified natural rubber latex, a pre-peroxide vulcanized latex, and a synthetic rubber latex. The pseudo-adhesion layer 6 is preferably a layer formed by applying and forming a pressure-sensitive adhesive composition containing an acrylic-modified natural rubber latex, a pre-peroxide vulcanized latex, and a synthetic rubber latex. More preferably, the pressure-sensitive adhesive composition is a layer formed by applying and forming a pressure-sensitive adhesive composition containing starch.

  The acrylic modified natural rubber latex is a latex obtained by graphing natural rubber latex with acrylic monomers. Examples of the acrylic monomer include methyl acrylate, n-butyl acrylate, hexyl acrylate, and methyl methacrylate. Among these, methyl methacrylate is preferable. The degree of grafting is preferably 5 to 50% by weight relative to the natural rubber.

  Peroxide pre-cured latex is a latex obtained by pre-curing natural rubber latex with peroxide. Examples of peroxides include benzoyl peroxide, di-t-butylperoxydiisopropylbenzene, and t-butyl hydroperoxide. Among these, t-butyl hydroxide is latex dispersibility and stability during the reaction. It is known to be excellent in properties.

  Examples of the synthetic rubber latex include styrene-butadiene rubber latex, acrylonitrile-butadiene rubber latex, butadiene rubber latex, chloroprene rubber latex, urethane rubber latex, and the like.

  The blending ratio of acrylic modified natural rubber latex (resin solids) and pre-peroxide vulcanized latex (resin solids) to synthetic rubber latex (resin solids) (acrylic modified natural rubber latex (resin solids) ) And pre-peroxide vulcanized latex (resin solid content): the synthetic rubber latex (resin solid content)) is preferably 60:40 to 90:10 by weight, more preferably 70: 30-85: 15. If the total amount of acrylic-modified natural rubber latex and pre-peroxide vulcanized latex is too much above this range (if the synthetic rubber latex is too much below this range), adhesion to the substrate and cohesive force at the time of peeling will be insufficient. If the total amount of the acrylic modified natural rubber latex and the pre-peroxide vulcanized latex is too smaller than this range (if the synthetic rubber latex is more than this range), the adhesive force tends to decrease.

  The blending ratio (acrylic modified natural rubber latex: peroxide precured latex) of the acrylic modified natural rubber latex (resin solid content) and the pre-peroxide vulcanized latex (resin solid content) is 10 by weight. Is preferably 90:90:10, more preferably 20: 80-30: 70, but more preferably 80: 20-70: 30 when the pseudo-adhesive layer 6 is formed. If the amount of acrylic modified natural rubber latex is too much above this range (if the amount of pre-peroxide vulcanized latex is too small than this range), the pressure required for adhesion tends to increase, and the amount of acrylic modified natural rubber latex is below this range. If it is too much (when the amount of the pre-peroxide vulcanized latex is more than this range), the peeling tends to be difficult, and if it is peeled forcibly, the substrate may be damaged.

  The total content of acrylic-modified natural rubber latex (resin solid content), peroxide pre-vulcanized latex (resin solid content) and synthetic rubber latex (resin solid content) in the pressure-sensitive adhesive composition is preferably 50. It is -70 weight%, More preferably, it is 60-70 weight%. If the total content is less than 50% by weight, the adhesive strength tends to decrease, and if it exceeds 70% by weight, peeling tends to be difficult, and if it is peeled forcibly, the substrate may be damaged.

  The pressure-sensitive adhesive composition preferably contains an anti-blocking agent in order to avoid adhesion between the adhesive layers or pseudo-adhesive layers during storage.

  The content of the anti-blocking agent is 10 with respect to 100 parts by weight of the total amount of acrylic modified natural rubber latex (resin solid content), pre-peroxide vulcanized latex (resin solid content), and synthetic rubber latex (resin solid content). It is preferably ˜50 parts by weight, and more preferably 10 to 30 parts by weight. If the content of the anti-blocking agent is less than 10 parts by weight, the adhesive layers or pseudo-adhesive layers may adhere to each other during storage, and if it exceeds 50 parts by weight, the adhesive strength tends to decrease.

  Examples of the anti-blocking agent include calcium bicarbonate, light calcium carbonate, talc, metal stearate soap, starch, silica and the like. Among these, it is preferable to contain silica in order to improve heat resistance against printing by a laser printer after forming the adhesive layer or the pseudo adhesive layer. Moreover, when forming the pseudo-adhesion layer 6, it is preferable to contain starch, and the content is preferably 40 to 80% by weight, more preferably 50 to 70% by weight in the antiblocking agent. Even when the adhesive layer 6 is formed, starch may be contained, but its content is preferably less than 40% by weight, more preferably 20-30% by weight in the anti-blocking agent.

  In order to maintain and improve the coating suitability, additives such as a surfactant, an antifoaming agent, and a thickener may be added to the pressure-sensitive adhesive composition. As the surfactant, it is preferable to use a nonionic surfactant and an anionic surfactant in combination. Examples of the nonionic surfactant include polyoxyethylene lauryl ether, polyoxyethylene styrenated phenyl ether, and polyoxyethylene alkyl ether. As the anionic surfactant having an HLB of 13.0 to 19.0, sodium alkylbenzene sulfonate, sodium higher alcohol sulfate, sulfate ester or the like can be used. As the antifoaming agent, a non-silicon antifoaming agent is preferable without affecting the adhesive force, and it is preferable to add about 0.1 to 0.5% by weight. Thickeners are used for coater coating suitability, and acrylic, polyacrylic acid, PVA, CMC, etc., cellulose thickeners can be used, but acrylic thickeners also change in viscosity over time. Less preferred.

  The pressure-sensitive adhesive composition is prepared by, for example, blending an acrylic-modified natural rubber latex and a pre-peroxide vulcanized latex, adding a surfactant if necessary, and then blending a synthetic rubber latex, It can be produced by adding a blocking agent and, if necessary, adding additives such as an antifoaming agent and a thickener and mixing them. The antiblocking agent is preferably added after being dispersed in a dispersion medium such as a surfactant in order to improve dispersibility.

  The pseudo-adhesive layer 6 may be formed using other pressure-sensitive adhesive compositions, but it is preferable to use a pressure-sensitive adhesive composition that can be bonded with a weak pressure that is rubbed by hand. Examples of such a pressure-sensitive adhesive composition include a pressure-sensitive adhesive composition containing 45 to 55% by weight of an acrylic ester resin and 10 to 20% by weight of a rosin ester resin.

The adhesive layer and the pseudo-adhesive layer 6 can be formed by applying a pressure-sensitive adhesive composition by an application means such as a gravure coater, flexo, air knife coater, bar coater, and drying. The coating amount of the pressure-sensitive adhesive composition, adhesive, release property, from the viewpoint of transparency and the like, preferably 1 to 5 g / m ² (solid basis), more preferably 2 to 3 g / m ² (solid content Conversion).

  As the postcard piece 1 and the hiding piece 3, synthetic paper or synthetic films such as polyethylene, polyethylene terephthalate, polypropylene, and vinyl chloride can be used in addition to ordinary paper. When a synthetic film is used, it is preferable to perform a surface treatment such as a mat treatment or a corona treatment.

  2 is a diagram showing an example of a partially folded postcard according to the present invention. FIG. 2 (a) is a plan view, and FIG. 2 (b) is a perspective view showing a state where an information entry area is concealed by a concealing piece. It is. 2, the same members as those in FIG. 1 are denoted by the same reference numerals as those in FIG. 1, and detailed description thereof is omitted.

  3 and 4 are diagrams showing another example of the partially folded postcard of the present invention. FIG. 3 (a) is a plan view, and FIG. 3 (b) is a state in which the concealing piece is protected with release paper. 4A is a plan view showing a state where the release paper is cut off, and FIG. 4B is a perspective view showing a state where the information entry area is concealed by the concealing piece.

  3 and 4, 8 is a release paper, and 9 is a cut line. The same members as those in FIG. 1 are denoted by the same reference numerals as those in FIG. 1, and detailed description thereof is omitted.

  As shown in FIG. 3A, the release paper 8 has substantially the same shape as the concealing piece 3 and is connected to one side of the concealing piece 3. Then, as shown in FIG. 3B, the release paper 8 can be folded along the fold line 7 ′ to protect the pseudo adhesive layer 6. After the necessary information is entered in the information entry area 2, the release paper 8 is peeled off as shown in FIG. Thereafter, as shown in FIG. 4B, the concealment piece 3 can be folded at the fold line 7 and adhered to the postcard piece 1 to conceal the information entry area 2.

  The partially folded postcards shown in FIGS. 3 and 4 are useful when a release paper can be formed by applying a release agent at the time of postcard manufacture, and a release paper is required to protect the pseudo adhesive layer 6. is there.

  Hereinafter, the present invention will be described in detail by way of examples.

<Manufacture of pressure-sensitive adhesive composition>
Each component was mixed with the composition shown in Table 1, and stirred well with a homocolloid mixer to obtain a pressure-sensitive adhesive composition. The latex used is as follows.

(1) Acrylic-modified natural rubber latex “QY # 25MG” (manufactured by Qu Yu Kasei Co., Ltd.), resin solid content 50 wt%

(2) Pre-peroxide vulcanized latex “QY # 055PC” (manufactured by Qu Yu Kasei Co., Ltd.), resin solid content 55 wt%

(3) Synthetic rubber latex “DL-620” (manufactured by Asahi Kasei Chemicals Corporation), high styrene type, resin solid content 50 wt%

<Example 1>
Using the pressure-sensitive adhesive composition shown in Table 2, a bi-fold postcard shown in FIG. 1 was prepared. That is, the composition No. 1 was prepared on a high quality paper (110 kg) as the postcard piece 1 and the hiding piece 3 so that the dry weight would be 8 to 10 g / m ² using a bar coater. 1 was applied and dried with hot air at 105 ° C. for 1 minute, and then allowed to stand at 25 ° C. and 50% relative humidity for 1 hour to form a first adhesive layer 4 and a second adhesive layer 5. Further, the concealing piece 3 was prepared by using a bar coater so that the dry weight was 8 to 10 g / m ² . 3 was coated and dried with hot air at 105 ° C. for 1 minute, and then allowed to stand at 25 ° C. and 50% relative humidity for 1 hour to form a pseudo adhesive layer 6.

  The concealment piece 3 of the obtained bi-fold postcard is folded at the fold line 7 and a load of up to 14.71 N is applied with a 500-yen coin lengthwise, and the first adhesive layer 4, the second adhesive layer 5, and the pseudo adhesive layer 6 When the position corresponding to 1 was traced once, the minimum load at which sufficient adhesive force was obtained was measured, and the state of the postcard piece 1 and the hiding piece 3 when visually peeled at a peeling speed of 300 mm / min was visually observed. .

  The evaluation results are shown in Table 2.

<Example 2, Comparative Example 1>
A bi-fold postcard shown in FIG. 1 was prepared and evaluated in the same manner as in Example 1 except that the pressure-sensitive adhesive composition shown in Table 2 was used. The evaluation results are shown in Table 2.

It is a figure which shows an example of the two-fold postcard of this invention. It is a figure which shows an example of the partial bi-fold postcard of this invention. It is a figure which shows the other example of the partial bi-fold postcard of this invention. It is a figure which shows the other example of the partial bi-fold postcard of this invention.

Explanation of symbols

1 Postcard Piece 2 Information Entry Area 3 Hiding Piece 4 First Adhesive Layer 5 Second Adhesive Layer 6 Pseudo Adhesive Layers 7 and 7 ′ Fold Line 8 Release Paper 9 Cut Line

Claims (9)

A postcard piece having an information writing area, is connected to one side of the postcard piece, and concealing strips for concealing at least the information entry area, along at least the postcard piece with articulated side and opposite sides of the hides piece An adhesive layer comprising a formed first adhesive layer and a second adhesive layer formed at a position facing the first adhesive layer of the postcard piece; and the adhesive layer of at least one of the postcard piece and the concealing piece An information concealing postcard having a pseudo-adhesive layer formed in a region other than a forming region, wherein the adhesive layer contains an acrylic-modified natural rubber latex, a pre-peroxide vulcanized latex, and a synthetic rubber latex An information hiding postcard, which is a layer formed by applying and forming a pressure-sensitive adhesive composition.   The information hiding postcard according to claim 1, wherein the first adhesive layer is provided in a region other than a region facing the information entry region.   The information hiding postcard according to claim 1, wherein the pseudo adhesive layer is provided on substantially the entire surface other than the adhesive layer forming region.   The pseudo-adhesive layer is a layer formed by applying and forming a pressure-sensitive adhesive composition containing an acrylic-modified natural rubber latex, a pre-peroxide vulcanized latex, and a synthetic rubber latex. Item 4. An information hiding postcard according to any one of Items 1 to 3.   The pressure-sensitive adhesive composition has a weight ratio of 10:90 to 90:10 of the acrylic modified natural rubber latex (resin solid content) and the pre-peroxide vulcanized latex (resin solid content). The information concealment postcard according to any one of claims 1 to 4.   The total amount of acrylic modified natural rubber latex (resin solid content) and pre-peroxide vulcanized latex (resin solid content) of the pressure sensitive adhesive composition and the synthetic rubber latex (resin solid content) The information concealment postcard according to claim 1, wherein the weight ratio is 60:40 to 90:10.   The total content of the acrylic-modified natural rubber latex (resin solid content), the peroxide pre-vulcanized latex (resin solid content), and the synthetic rubber latex (resin solid content) in the pressure-sensitive adhesive composition is 50 to 70. The information hiding postcard according to claim 1, wherein the information hiding postcard is according to claim 1.   The pressure sensitive adhesive composition is 100 parts by weight in total of acrylic modified natural rubber latex (resin solid content), pre-peroxide vulcanized latex (resin solid content) and synthetic rubber latex (resin solid content). The information hiding postcard according to claim 1, further comprising 10 to 50 parts by weight of an antiblocking agent.   The information hiding postcard according to claim 8, wherein the antiblocking agent contains 40 to 80% by weight of starch.

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