JP2862735B2 - Sealing sheet and information recording body using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing sheet capable of concealing information and an information recording medium using the same, and more particularly to a sealing means used as a communication means for various notices and the like sent in large quantities from public institutions and the like. The present invention relates to a sealing sheet suitable for sealing and an information recording body using the same.

[0002]

2. Description of the Related Art In recent years, mailing of documents such as various payment notices, receipts, expiration notices, and the like from the Social Insurance Agency, banks, securities companies, electric power companies, and the like has increased sharply. Such a notice is a document relating to the privacy of the individual, and the contents of the notice differ depending on the destination.

[0003] Therefore, recently, the labor of the shipping work has been reduced by managing the data for each destination by a computer. That is, the data input to the computer is printed out continuously for each recipient at the time of shipping. At this time, on one side of the continuous recording paper,
The destination and the message are printed at the same time, separated for each recipient, and sent in an envelope with a window so that only the destination can be seen from the outside. By doing so, it is possible to prevent inconsistency between the destination and the message, and to omit operations such as address book.

[0004] However, since the postage of a sealed letter is higher than that of a postcard, various postcards capable of concealing information therein have been recently proposed and put into practical use. For example, there is a postcard in which a heat-sensitive adhesive layer capable of recording information on the surface is formed on one side of a paper support (Japanese Utility Model Application Laid-Open No. 1-148371). This postcard is folded into two and becomes a postcard size. After recording information on the surface of the heat-sensitive adhesive layer, it is folded in two, and the heat-sensitive adhesive layers are thermocompressed with an adhesive strength capable of peeling off each other. Postcard.

[0005] However, such a postcard as described above is:
Since the message must be printed on one side and the destination must be printed on the other side, inconvenience may occur if a large number of notices need to be prepared as described above. That is, when the notification content differs for each person, printing the address and the notification content separately leads to a mismatch between the destination and the notification content, and there is a danger that the notification is sent to another person.

Further, the above-mentioned conventional sealing sheet does not have sufficient affinity between the heat-sensitive adhesive layer and the printing ink (usually an aqueous ink is used). The disadvantage is that the content is transferred. Therefore, in order to improve the releasability of the heat-sensitive adhesive layer, a method of adjusting the temperature and pressure of the thermocompression bonding may be considered. However, it is extremely difficult to adjust the releasability by this method, and natural peeling due to poor adhesion may occur. May cause.

Therefore, recently, at least a part of the surface of the base sheet is provided with a hydrophilic non-peelable adhesive base having a high affinity for the aqueous printing ink and fine particles exhibiting a non-affinity for the adhesive base. For information carriers provided with a layer of an adhesive composition comprising a filler in the form of a liquid (JP-A-4-59395). This is a sealable sheet that can be peeled off by applying a rewetting adhesive made of a mixture of polyvinyl alcohol or polyethylene oxide and a fine particulate filler such as wheat starch or silica to paper. After printing information on the adhesive composition layer of the sheet, it is integrated by thermal bonding to form an information recording body.

[0008]

However, in the above information carrier sheet, since the water resistance of the adhesive layer is poor, the information carrier sheet may be integrated under a high humidity environment or may be integrated without sufficiently drying during production. When it is formed, the adhesive strength of the peeled surface increases, and the function as the peeled surface may be reduced. Therefore, when this information carrier sheet is manufactured, there is a disadvantage that a long drying step or a large-sized drying apparatus is required in the manufacturing stage.

The inventors of the present invention have conducted intensive studies to solve the above-mentioned drawbacks. As a result, the present inventors have used a support having a predetermined size by folding it in three, and having a weakly adhesive heat-sensitive adhesive layer and a strong adhesive. By forming an adhesive heat-sensitive adhesive layer at predetermined portions of about 2/3 of the three divided areas of the support, a destination and a message can be simultaneously printed on one side of the sealing sheet. A letter of a letter can be produced, and a coating solution containing an aqueous radiation-curable resin and an aqueous adhesion-imparting resin is applied to a support as a weakly-adhesive heat-sensitive adhesive layer, and irradiated with radiation. By doing so, it is possible to form a heat-sensitive adhesive layer having water resistance without going through a drying step, and by adjusting the mixing ratio of the aqueous radiation-curable resin and the aqueous adhesiveness-imparting resin, easily, With water-based ink On high affinity, it found that it is possible to obtain a heat-sensitive adhesive layer having a desired peel resistance and adhesion, have reached the present invention.

[0010] Accordingly, a first object of the present invention is to provide a sealing sheet capable of producing a postcard having information hidden inside by simultaneously printing a destination and a message on one side. It is in. A second object of the present invention is to provide a sealing sheet which has good printability with an aqueous ink, can easily adjust the adhesive strength of a peeled surface, and shows stable peelability.

A third object of the present invention is to improve the production efficiency,
An object of the present invention is to provide a sealing sheet capable of reducing production costs. A fourth object of the present invention is to provide an information recording medium having excellent adhesion and peeling properties, in which the adhesive surface is not spontaneously peeled off during mailing and the recorded contents are not damaged or transferred at the time of peeling. Is to provide the body. A fifth object of the present invention is to provide information which can be used as a round-trip postcard, and which is suitable for mailing large amounts of low-priced notices, etc., in which the correspondence differs depending on the addressee, without erroneous transmission. To provide a recording medium.

[0012]

SUMMARY OF THE INVENTION The above objects of the present invention are to provide a support which is folded in three in an S-shape or a Z-shape to have a predetermined size, and about 約 of one surface of the support. A weakly-adhesive heat-sensitive adhesive layer capable of recording information on the surface, and about 面積 of the other surface of the support
In a sealing sheet comprising a strong adhesive heat-sensitive adhesive layer laminated on the area of

The weak adhesive heat-sensitive adhesive layer is laminated on a central region which is folded into three and divided into three, and either one of right and left regions, and the strong adhesive heat-sensitive adhesive layer is A central region that is folded into three and divided into three, and a region where the weakly adhesive heat-sensitive adhesive layer is laminated are not laminated on the front and back, and the two adjacent regions are laminated. When the thermocompression bonding is performed, the sealing surface is such that the adhesive surface cannot be peeled off,

All heat-sensitive adhesive layers are coated with an aqueous coating solution.
And a layer that is dried if necessary.
The adhesive heat-sensitive adhesive layer is composed of at least an aqueous radiation-curable resin (A) and an aqueous heat-sensitive adhesive resin (B), and the aqueous radiation-curable resin (A) and the aqueous heat-sensitive adhesive resin (B). Of A / B is 10/90 to 90/10
And the T-type peel strength at the interface between the weakly adhesive heat-sensitive adhesives generated by thermocompression bonding is 50 to 50 mm under a peel strength of 300 mm / min in an environment of 20 ° C. and 65% RH.
200 g / 50 mm, and the A / B is 70/30 to 0/1 in the strong adhesive heat-sensitive adhesive layer .
The present invention has been achieved by a sealing sheet characterized by the fact that it is 00 and an information recording body using the same. In the present invention, “aqueous” means “can be used in an aqueous coating solution”.

In the sealing sheet of the present invention, the communication information is recorded on the surface of the weakly adhesive heat-sensitive adhesive layer, and is transmitted to an adjacent support surface on which the weakly adhesive heat-sensitive adhesive layer is not laminated. After recording, so that the weak adhesive heat-sensitive adhesive layers and the strong adhesive heat-sensitive adhesive layers overlap,
By folding it into an S-shape or a Z-shape and thermocompression bonding, an information recording medium in which information is hidden inside can be manufactured. Here, the information recording medium means a communication means such as a postcard or direct mail.

Hereinafter, the sealing sheet and the information recording body of the present invention will be described in detail with reference to the drawings, but the present invention is not limited thereto. FIG. 1 is a sectional configuration diagram of the sealing sheet of the present invention. FIG. 2 is a cross-sectional view of an information recording body obtained by using the sealing sheet of FIG. The sealing sheet according to the present invention is obtained by folding a support (1) having a predetermined size by folding it into an S-shape or a Z-shape, and laminating the support on the front and back sides in predetermined regions corresponding to approximately two-thirds of each. A weakly adhesive heat-sensitive adhesive layer (2) and a strongly adhesive heat-sensitive adhesive layer (3).

The support (1) in the present invention can be appropriately selected and used from known paper materials such as high quality paper and coated paper. Further, continuous recording paper used for a word processor or a personal computer can be used as a support. The weakly adhesive heat-sensitive adhesive layer (2) in the present invention is a layer on which information can be recorded. The heat-sensitive adhesive layer (2) is provided at the center of the front surface of the support (1) which is folded into three and divided into three. The region (2a) and one of the left and right regions (2b) are stacked.

[0018] Further, the weak adhesion of the heat-sensitive adhesive layer (2) is, T-peel strength in the case where the heat-sensitive adhesive layer (2) between was allowed thermocompression bonding, 20 ° C., 300 meters in an environment of 65% RH
50~200g / 50mm der under the m / min of peeling speed
It is necessary to use 70 to 120 g / 50 mm
Is preferably in the range. When the T-type peel strength is 50 g / 50 mm or less, spontaneous peeling may occur. When the T-peel strength is 200 g / 50 mm or more, recorded contents may be damaged or transferred.

In the present invention, the T-type peel strength is 50 to
In order to make the range of 200 g / 50 mm, the mixing ratio (A / B) of the water-based radiation-curable resin (A) and the water-based heat-sensitive adhesive-imparting resin (B) is 10/90 to 90/10, preferably , 30/70 to 80/20 to prepare an aqueous solution, and if necessary, a pigment is further added.

When the mixing ratio of the water-based heat-sensitive adhesive-imparting resin (B) to the water-based radiation-curable resin (A) is 90% by weight or more, the T-peel strength under the above conditions is 200%.
g / 50 mm or more, peeling curl may occur,
Reading the information becomes difficult due to damage to the printing surface. On the other hand, when the mixing ratio of the water-based heat-sensitive adhesive-imparting resin (B) to the water-based radiation-curable resin (A) is 10% by weight or less, the T-peel strength becomes 50 g / 50 mm or less, which naturally occurs during mailing. It is not preferable because it may come off.

On the other hand, the heat-sensitive adhesive layer (3) having strong adhesiveness in the present invention is provided with the central region (3a) on the back surface of the support (1) which is folded in three and divided into three, and The region (2b) on which the heat-sensitive adhesive layer (2) is laminated is laminated on the region (3b) where there is no front-back relationship.

The heat-sensitive adhesive layer (3) having strong adhesiveness uses at least a water-based heat-sensitive adhesive-imparting resin. From the viewpoint of imparting water resistance to the heat-sensitive adhesive layer (3), the water-based heat-sensitive adhesive-imparting resin is used. A water-based radiation-curable resin can be mixed with the mixture, and other additives such as a pigment can be mixed and used. In this case, the content of the water-based radiation-curable resin is preferably 40% or less, particularly 30% or less, based on the water-based heat-sensitizing resin, from the viewpoint of adhesiveness.

In the present invention, the water-based radiation-curable resin used for the weakly-adhesive heat-sensitive adhesive layer (2) and the strongly-adhesive heat-sensitive adhesive layer (3) is a water-based electron beam-curable resin or a water-based ultraviolet-curable resin. It is preferable to use a conductive resin. These may be water-soluble, water-dispersion type or emulsion type.

Specific examples of the water-soluble radiation-curable resin include ethylene glycol acrylate, acrylamide and its N-methylol derivative, acrylamide ether having an amine group or an amino group in a monomer, acryloylmorpholine and its N-methylol derivative. ,
Synthetic polymers such as modified PVA-based (meth) acrylates; natural water-soluble polymers such as casein, gelatin, and starch; modified (meth) acrylates such as cellulose derivatives; hydroxyethyl methacrylate; hydroxyethyl acrylate; Formulations composed of water-soluble monomers and oligomers such as vinylpyrrolidone can be mentioned.

Examples of the emulsion-type radiation-curable resin include urethane-based, polyester-based, and epoxy-based (meth) acrylates, or water-dispersed resins obtained by emulsifying formulas thereof. Can be. Water-based radiation-curable resins include:
If necessary, use an aqueous radiation curing initiator (Daroqua (D
arocur) 1173: trade name of Merck). The addition amount is usually several weight% with respect to the aqueous radiation-curable resin, but is not particularly limited.

On the other hand, in the present invention, the water-based heat-sensitive adhesive-providing resin used for the weakly-adhesive heat-sensitive adhesive layer (2) and the strongly-adhesive heat-sensitive adhesive layer (3) is a thermoplastic water-soluble polymer. , Ethylene vinyl acetate, polyolefin-based water-dispersed resins, and the like, and among them, those having a glass transition temperature of 65 ° C. or less are preferable.

In the present invention, an aqueous solution containing the above-mentioned water-based radiation-curable resin and water-based heat-sensitive adhesiveness-imparting resin is added to
Further, by adding a pigment, the writing property of the adhesive surface of the heat-sensitive adhesive layer (2) can be improved. The pigment can be appropriately selected from known materials such as titanium dioxide, silica, calcium carbonate and the like.
It is preferably about 30% by weight. The heat-sensitive adhesive layer (2) may further contain an aqueous synthetic resin such as an ionomer water-dispersed resin or an emulsion resin, if necessary.

Further, the heat-sensitive adhesive layer (2) having a weak adhesive property in the present invention is prepared by applying the above-mentioned coating solution to the support (1) at the time of production.
By irradiating the coating layer with radiation after coating, the coating layer can be made water-resistant even without providing a drying step, whereby the manufacturing equipment can be reduced in size and energy can be saved. . The same applies to the case where an aqueous radiation-curable resin is added to the strong adhesive heat-sensitive adhesive layer (3).

The sealing sheet of the present invention comprises a substrate (1) having a weakly-adhesive heat-sensitive adhesive layer (2) and a strongly-adhesive heat-sensitive adhesive layer (3) formed on the front and back thereof as described above. A heat-sensitive adhesive layer of the sealing sheet having low adhesiveness (2)
After performing desired printing on a region where no adhesive layer is provided (that is, the surface of the support (1)), the adhesive is weakly heat-sensitive adhesive by folding it into an S-shape or a Z-shape. Layer (2)
100 ° C between each other and between the heat-sensitive adhesive layers (3) having strong adhesiveness
An information recording body can be obtained by thermocompression bonding at the following temperature (FIG. 2).

FIGS. 3 and 4 show examples of printing when the sealing sheet of the present invention is used as a postcard.
It can be used as continuous recording paper for word processors and personal computers. In FIG. 3, a message is printed on the surface of the weakly heat-sensitive adhesive layer (2) in the central area (2a) of the front surface of the sealing sheet divided into three and the left area (2b). The destination is printed on the right area where the heat-sensitive adhesive layer (2) is not provided. A strong adhesive heat-sensitive adhesive layer (3) is laminated on the central area (3a) and the right area (3b) on the back surface of the sealing sheet.

When this is folded in three in an S shape and thermocompression-bonded, the central area (3a) and the right area (3
b) is adhered so that it cannot be peeled off, and the central area (2a) and the left side area (2b) of the front surface of the sealing sheet are peelably adhered. This makes it possible to obtain a postcard in which the communication message is hidden. It should be noted that general matters that do not need to be concealed can be described on the back surface of the postcard made as described above.

In FIG. 4, a message is printed on the surface of the weakly heat-sensitive adhesive layer (2) in the central area (2a) of the front surface of the sealing sheet divided into three and the right area (2b). The destination is printed on the left area where the heat-sensitive adhesive layer (2) is not provided. In the center area (3a) and the left area (3b) on the back surface of the sealing sheet, a strong adhesive heat-sensitive adhesive layer (3) is laminated.

When this is folded in three in a Z-shape and thermocompression-bonded, the central area (3a) and the left area (3
b) is adhered so as not to be peelable, and the central area (2b) and the right side area (2a) of the front surface of the sealing sheet are peelably adhered. As a result, the message is hidden inside the postcard. Since the sealing sheet of the present invention adjusts the adhesiveness and peelability of the heat-sensitive adhesive layer by adjusting the composition of the heat-sensitive adhesive layer, the sealing sheet having the desired adhesiveness and peelability can be easily reproduced. It can be manufactured with good performance.

[0034]

As described above in detail, the sealing sheet of the present invention can produce an information recording body by simultaneously printing a destination and a message on one side, so that the notification content differs for each destination. This is useful when mailing notices or the like in large quantities and at low cost. Further, since the sealing sheet of the present invention has a peelable weak adhesive heat-sensitive adhesive layer and a non-peelable strong adhesive heat-sensitive adhesive layer formed in advance on a support, the production of a seal postcard is performed. Is easy.

Further, the sealing sheet of the present invention can impart water resistance to the heat-sensitive adhesive layer by irradiating the heat-sensitive adhesive layer with a radiation. The manufacturing equipment can be reduced in size and energy can be saved. Further, the information recording body of the present invention produced with the sealing sheet of the present invention,
There is no spontaneous peeling of the adhesive surface during mailing, and no breakage or transfer of printed content during peeling. Furthermore, the information recording medium of the present invention can be used as recycled paper because it can be easily disaggregated, and can be used as a reciprocating postcard because it has a writing property on the peeled surface.

[0036]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the invention is limited thereto.

Embodiment 1 Acrylic amide resin (BR-170: trade name, manufactured by Monocure Co.) 50 parts (as solid content) as the water-based radiation-curable resin (A), and a thermoplastic water-soluble resin (B) as the water-based heat-sensitive adhesive-imparting resin [Paogen PP-15:
(Daiichi Kogyo Seiyaku Co., Ltd.) 50 parts (as solid content), and then (A + B) 95 in this mixed aqueous solution.
Silica (Mizuka Seal SK-7, particle size 1.5 μm: manufactured by Mizusawa Chemical) was mixed as the pigment (C) so that the amount was 5 parts per part.

Next, high quality paper of rice basis weight 90 g / m ² (1)
The mixed liquid containing A, B, and C is dried on the front surface in three divided central regions (2a) and left regions (2b) so that the thickness after drying becomes 5 g / m ^2. After coating and drying (110 ° C), the electron beam irradiation machine [Energy Science Industry (Energy Science Industry)
By using an electron beam having an electron acceleration voltage of 170 KV and an electron dose of 1 Mrad on the coated surface to form a heat-sensitive adhesive layer (2).

On the other hand, a water-soluble polymer compound [PAOGEN PP
-15: trade name of Daiichi Kogyo Seiyaku Co., Ltd.] 95 parts (as a solid component), 5 parts of silica as a pigment (as a solid component) are mixed, and this mixed aqueous solution is mixed with the above high-quality paper (1) back surface. In the center area (3a) and the left area (3b), the resultant was coated and dried so that the thickness after drying was 5 g / m ² , thereby forming a strong adhesive heat-sensitive adhesive layer (3).

On the front side of the sealing sheet produced as described above, the same information as in the continuous slip recording method and the color electrophotographic recording method as shown in FIG. Image information was recorded. Next, the heat-sensitive adhesive layers (2a, 2b) having weak adhesiveness and the heat-sensitive adhesive layers (3a, 3b) having strong adhesiveness are folded at a position indicated by a broken line in a Z shape. The sheets were stacked, passed through a hot roll having a surface temperature of 100 ° C., and thermocompression-bonded to produce a postcard.

When the T-type peel strength of the postcard temporarily bonded as described above was measured, the peel strength was 85 g / 50 mm, which was good as well as adhesiveness. I couldn't see it. Also, the opened postcard could be easily broken by hand.

Embodiment 2 FIG. A confidential postcard was prepared in exactly the same manner as in Example 1 except that an emulsion-based radiation-curable resin (New Frontier WE-101: trade name of Daiichi Kogyo Seiyaku Co., Ltd.) was used as the water-based radiation-curable resin (A). Produced. When the T-type peel strength of the obtained confidential postcard was measured, it was 95 g / 50 mm, and the peelability was good together with the adhesiveness. After peeling, no peeling curl or damage / transfer of the printed contents was observed.

Embodiment 3 FIG. As the water-based radiation-curable resin (A), the following compound composition [TP-1124: trade name, manufactured by Monocure Co.] comprising an acrylamide ether resin having an amine group or an amino group in a monomer and a pigment such as calcium carbonate 40 Part (as a solid content) and a thermoplastic water-soluble resin (B) as a water-based heat-sensitive adhesiveness-imparting resin [Paogen PP-15: trade name of Daiichi Kogyo Seiyaku Co., Ltd.]
A weakly adhesive heat-sensitive adhesive layer (2) was formed in the same manner as in Example 1 except that a mixed aqueous solution obtained by mixing 60 parts (as a solid content) was applied to one surface of the support (1). .

Example 1 was repeated except that 80 parts of the water-based heat-sensitive adhesive-imparting resin was mixed with 20 parts of the above water-based radiation-curable resin (A), and the mixed aqueous solution was applied to the support (1). A heat-sensitive adhesive layer (2) having strong adhesiveness was formed in exactly the same manner as described above. The sealing sheet produced as described above was thermocompression-bonded in exactly the same steps as in Example 1 to produce a sealing postcard with information recorded therein. When the T-type peel strength of the obtained confidential postcard was measured, it was 100 g / 50 mm, and the peelability was good together with the adhesiveness. Peeling after peeling did not cause any occurrence of curl or damage / transfer of printed contents.

Composition of TP-1124: Acrylamide ether resin having amine group or amino group in monomer 26% by weight CaCO ₃ 25% by weight TiO ₂ 25% by weight Water 24% by weight

Embodiment 4 FIG. A confidential postcard was prepared in exactly the same manner as in Example 2 except that the coated surface was irradiated with an electron beam in a wet state without drying the mixed aqueous solution applied to the high-quality paper (1). When the T-type peel strength of the obtained confidential postcard was measured, the peelability was good as well as the adhesiveness of 75 g / 50 mm, and no peeling curl, breakage or transfer of printed contents were observed after peeling.

Embodiment 5 FIG. 40 parts (as solid content) of an emulsion radiation-curable resin (New Frontier WE-101: a trade name of Daiichi Kogyo Seiyaku Co., Ltd.) as the aqueous radiation-curable resin (A), and heat as an aqueous heat-sensitive adhesive-imparting resin Plastic water-soluble resin (B) [PAOGEN PP
-15: trade name of Daiichi Kogyo Seiyaku Co., Ltd.) 40 parts (as solid content), and 20 parts of water-dispersed ionomer resin D [Chemipearl S100: trade name of Mitsui Petrochemical Industry Co., Ltd.] ), And silica (Mizuka Seal SK-) as a pigment (C) in the mixed aqueous solution.
7, a particle size of 1.5 μm) was produced in the same manner as in Example 2 except that confidential postcards were prepared. T of the confidential postcard obtained
When the mold peel strength was measured, it was 105 g / 50 mm,
The peelability was good as well as the adhesiveness, and no peeling curl or breakage / transfer of printed content was observed after peeling.

Comparative Example 1 Except that the water-based radiation-curable resin (A) was 91 parts (as solid content) and the water-based heat-sensitive adhesiveness-imparting resin (B) was 9 parts (as solid content), the inside was completely the same as in Example 1. A confidential postcard with recorded information was made. When the T-type peel strength of the above confidential postcard was measured, the adhesiveness was poor at 5 g / 50 mm.

Comparative Example 2 Example 1 except that the water-based radiation-curable resin (A) was 9 parts (as solid content) and the water-based heat-sensitive adhesiveness-imparting resin (B) was 91 parts (as solid content).
A confidential postcard with information recorded inside was created in exactly the same manner as in. When the T-type peel strength of the above confidential postcard was measured, the adhesive strength was 305 g / 50 mm, which was sufficient, but the occurrence of peel curl, damage to the printed contents, and transfer were observed.
Peelability was poor.

Comparative Example 3 A confidential postcard in which information was recorded in the same manner as in Example 2 except that the water-based radiation-curable resin (A) was 91 parts (as a solid content) and the water-based heat-sensitive adhesive resin (B) was 9 parts. Was prepared. When the T-type peel strength of the above confidential postcard was measured, the adhesiveness was poor at 5 g / 50 mm.

Comparative Example 4 9 parts (as solid content) of water-based radiation-curable resin (A), water-based heat-sensitive adhesive-imparting resin (B)
A confidential postcard with information recorded therein was prepared in exactly the same manner as in Example 2 except that 91 parts were used. When the T-type peel strength of the above confidential postcard was measured, the adhesiveness was 250 g / 50 mm, which was sufficient, but peeling was curled, the printed contents were damaged and transferred, and the peelability was poor.

Comparative Example 5 Strong adhesive heat-sensitive adhesive layer (3)
A confidential postcard with information recorded therein was prepared in exactly the same manner as in Example 3, except that in the formation of the resin, 75 parts of an aqueous radiation-curable resin was mixed with 25 parts of an aqueous thermal adhesive resin. When the T-peel strength between the strongly adhesive heat-sensitive adhesive layers (3) of the above confidential postcard was measured, it was found to be 50 g /
The adhesiveness was 50 mm, which was poor.

Comparative Example 6 A confidential postcard in which information was recorded in the same manner as in Example 3 except that the water-based radiation-curable resin (A) was 91 parts (as a solid content) and the water-based heat-sensitive adhesive resin (B) was 9 parts. Was prepared. When the T-type peel strength of the above confidential postcard was measured, the adhesiveness was poor at 5 g / 50 mm.

Comparative Example 7 9 parts (as solid content) of water-based radiation-curable resin (A), water-based heat-sensitive adhesive-imparting resin (B)
Was used in the same manner as in Example 3 except that 91 parts were used as the confidential postcard having information recorded therein. When the T-type peel strength of the above confidential postcard was measured, the adhesiveness was 275 g / 50 mm, which was sufficient, but peeling was curled, the printed contents were damaged and transferred, and the peelability was poor. The formulations of Examples 1 to 5 and Comparative Examples 1 to 7 are shown in Table 1, and the evaluation results are shown in Table 2.

[0055]

[Table 1]

[0056]

[Table 2]

[Brief description of the drawings]

FIG. 1 is a sectional view of a sealing sheet of the present invention.

FIG. 2 is a cross-sectional view of the information recording body of the present invention obtained using the sealing sheet of FIG.

FIG. 3 is a view showing a printing example in a case where the sealing sheet of the present invention is folded in a Z-shape to form a postcard.

FIG. 4 is a view showing a printing example in which the sealing sheet of the present invention is folded into an S-shape to form a postcard.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Support body 2 ... Weak adhesive heat-sensitive adhesive layer 3 ... Strong adhesive heat-sensitive adhesive layer

────────────────────────────────────────────────── ⁶ Continuation of the front page (51) Int.Cl. ⁶ Identification symbol FI C08J 5/12 D21H 5 / 00B (56) References JP-A-4-45996 (JP, A) JP-A-3-108594 ( JP, A) JP-A-3-24174 (JP, A) JP-A-5-50269 (JP, U) JP-A-3-62876 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , (DB name) B42D 15/08 B42D 15/02 501 D21H 27/00 G09F 3/10 B32B 27/00 C08J 5/12

Claims (5)

(57) [Claims] 1. A support which is folded in three into an S-shape or a Z-shape to have a predetermined size, and about ／ of one surface of the support.
A weakly-adhesive heat-sensitive adhesive layer capable of recording information on its surface, and a strongly-adhesive heat-sensitive adhesive laminated on about 積 層 of the other surface of the support. A heat-sensitive adhesive layer having low adhesiveness, the heat-sensitive adhesive layer having low adhesiveness being laminated in a central region which is folded into three and divided into three, and either one of right and left regions, The heat-sensitive adhesive layer is laminated in a central region where the heat-sensitive adhesive layer is folded into three and divided into three, and a region where the weak adhesive heat-sensitive adhesive layer is laminated does not have a front-to-back relationship. A sealing sheet in which the adhesive surface cannot be peeled off when two adjacent areas are thermocompressed. All the heat-sensitive adhesive layers are coated with an aqueous coating solution, and
Layer which is dried in the first place
The adhesive layer comprises at least a water-based radiation-curable resin (A) and a water-based heat-sensitive adhesiveness-imparting resin (B), and a mixing ratio A of the water-based radiation-curable resin (A) and the water-based heat-sensitive adhesiveness-imparting resin (B). / B is Ri 10 / 90-90 / 10 der, and,
T of the interface between weakly heat-sensitive adhesives generated by thermocompression bonding
The mold peel strength is 3 in an environment of 20 ° C. and 65% RH.
Under a peel strength of 00 mm / min, 50 to 200 g / 50
with a mm, the heat-sensitive adhesive layer odor of the strong adhesion
Wherein the A / B is 70/30 to 0/100. 2. The sealing sheet according to claim 1, wherein the heat-sensitive adhesive layer having low adhesiveness is a layer further containing a pigment and / or an aqueous synthetic resin exhibiting removability. 3. A heat-sensitive adhesive layer having a weak adhesive property and a strong adhesive property.
Both heat-sensitive adhesive layers have low-temperature sealability of 100 ° C or less.
The sealing sheet according to claim 1 or 2, wherein 4. The water-based heat-sensitive adhesive-imparting resin has a glass transition.
It has a low-temperature sealing property at a point of 65 ° C or less and emits water
4. The composition according to claim 3, which has compatibility with a line-curable resin.
Sealing sheet. 5. A sealing device according to claim 1.
The sheet is bonded to the heat-sensitive adhesive layers
S-shaped or Z-shaped so that the heat-sensitive adhesive layers overlap
An information recording medium that is folded in three and thermocompressed.
At least the heat-sensitive contact of the weak adhesive inside the information recording medium.
Communication information is recorded on the surface of the adhesive layer.
Information record.