JP2021017037A - Pressure bonding postcard and manufacturing method of the same, and method of preventing blocking in pressure bonding postcard pressure-bonded by folding information recording face provided with pseudo pressure bonding layer on surface inwards - Google Patents

Abstract

To provide a pressure bonding postcard with a re-releasable sheet form, the postcard being capable of preventing blocking even when the postcard is exposed to water.SOLUTION: There is provided a pressure bonding postcard 1 pressure-bonded by folding an information recording face 3 provided with a pseudo adhesion layer 5 on the surface thereof inwards, in which a water-resistant layer 6 formed by an aqueous coating agent comprising an alkali-soluble water soluble resin, styrene-based film formation emulsion, and water is provided on an outer surface 4 exposed to the outside in a folded state.SELECTED DRAWING: Figure 1

Description

The present invention relates to a crimped postcard and a method for producing the same, and a method for suppressing blocking in a crimped postcard in which an information recording surface provided with a pseudo-crimping layer is folded inward and crimped.

Conventionally, in order to more easily transmit confidential and confidential information only to the recipient, a re-peelable adhesive layer (pseudo-adhesive layer) that is easy to peel off but difficult to re-bond is provided. A crimped postcard in which the information recording surface is hidden by a sheet is known. In such a crimped postcard, information is printed on a sheet as a base material by means of various inks, electrophotographics, etc., information recording surfaces are overlapped with each other, and a pseudo-adhesive layer is provided on the overlapped surfaces to crimp the information. By adhering by the means of the above, it is possible to immediately know whether or not the information has been peeled off before it reaches the recipient's hands, and it is possible to prevent a person other than the recipient from knowing the information. In addition to the case where such crimped postcards are used for the purpose of concealing information as described above, a large amount of information such as advertising information is recorded on a sheet larger than the postcard size, and this sheet is used as a postcard size with low postage. It is also used when folding to the size of a postcard or for direct mail. Crimped postcards can be classified into several forms according to the type of folding (that is, how to fold) and the type of pseudo-adhesive layer to be formed.

The types of folds include two folds (also called V folds) and Z folds. In the bi-folding, a pseudo-adhesive layer is formed on the inner surface on which the information is recorded, and the entire inner surface is folded in half and bonded together. In the case of folding in half, it will be provided with four information recording surfaces including the exposed front and back surfaces. In Z-folding, a rectangular sheet is folded in three in a Z-shape, pseudo-adhesive layers are formed on both the front and back sides of the central surface, and the surfaces on both sides are bonded to the front and back pseudo-adhesive layers. It is a thing. In this case, both the front surface and the back surface can be peeled off, and six information recording surfaces including the exposed front and back surfaces are provided.

The types of the pseudo-adhesive layer are mainly the PP (polypropylene) thermocompression bonding method, the active energy ray-curing varnish pressure bonding method, and the glue pressure bonding method. Can be mentioned. In the active energy ray-curable varnish crimping method, after applying a varnish that cures by being irradiated with active energy rays such as ultraviolet rays and electron beams, the coated surface is irradiated with active energy rays to form a pseudo-adhesive layer. As an example of such a varnish, for example, the one described in Patent Document 1 can be mentioned. In the glue pressure bonding method, a pressure-sensitive adhesive mainly composed of a water-based emulsion or latex is applied to form a pseudo-adhesive layer, and examples of such varnishes include those described in Patent Document 2. it can.

JP-A-2007-145907 Japanese Unexamined Patent Publication No. 2001-146584

As described above, the crimped postcard printed on a removable sheet has various advantages, but blocking that makes it difficult to peel off the pseudo-bonded surface when it gets wet with water. May occur. If you try to forcibly peel off the pseudo-adhesive surface with a crimped postcard that has caused such blocking, the sheet may be torn or a part of the sheet that was not partially peeled off may remain on the inner information recording surface. This will adversely affect the readability of the recording surface. It is considered that such a phenomenon is caused by the fact that the strength of the sheet decreases when it gets wet with water, and the strength becomes weaker than the strength of the pseudo-adhesion. In particular, crimped postcards are prone to getting wet due to delivery in rainy weather or flooding of posts. Generally, these crimped postcards have a note that they should be dried before peeling when they get wet, but it takes a long time to dry naturally, and even if they are dried with a dryer or the like. It takes time and effort.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a crimping postcard in the form of a removable sheet that can suppress blocking even when it comes into contact with water. To do.

As a result of diligent studies to solve the above problems, the present inventor folds the information recording surface provided with the above-mentioned pseudo-adhesive layer on the surface and crimps the crimped leaflet. All of the above problems can be solved by providing a water resistant layer formed of an alkali-soluble water-soluble resin, a styrene-based film-forming emulsion, and a water-based coating agent containing water on the surface exposed to the outside in a squeezed state. We have found and completed the present invention. Specifically, the present invention provides the following.

The present invention is a crimped postcard in which an information recording surface provided with a pseudo-adhesive layer on the surface is folded inward, and the surface exposed to the outside in the folded state is provided with a water resistant layer. , A pressure-bonded postcard characterized by being formed of an alkali-soluble water-soluble resin, a styrene-based film-forming emulsion, and a water-based coating agent containing water.

The styrene-based film-forming emulsion is at least one selected from the group consisting of a styrene acrylic polymer, a styrene maleic acid polymer, and a styrene maleic acid half ester polymer having a glass transition temperature (Tg) of 0 to 20 ° C. Is preferable.

The alkali-soluble water-soluble resin is preferably a styrene-acrylic and / or styrene-maleic acid-based alkali-soluble resin.

The ratio of the alkali-soluble water-soluble resin and the styrene-based film-forming emulsion contained in the water-based coating agent is 10/90 to 30/70 in terms of the solid content mass ratio of the alkali-soluble water-soluble resin / styrene-based film-forming emulsion. It is preferable to have.

Further, the present invention is a method for manufacturing a crimped postcard in which an information recording surface provided with a pseudo-crimping layer on the surface is folded inward and crimped, and an alkali-soluble water-soluble surface is exposed to the outside in the folded state. It is also a method for producing a pressure-bonded postcard, which comprises a step of forming a water-resistant layer by applying a water-based coating agent containing a sex resin, a styrene-based film-forming emulsion, and water.

The styrene-based film-forming emulsion is at least one selected from the group consisting of a styrene acrylic polymer, a styrene maleic acid polymer, and a styrene maleic acid half ester polymer having a glass transition temperature (Tg) of 0 to 20 ° C. Is preferable.

The alkali-soluble water-soluble resin is preferably a styrene-acrylic and / or styrene-maleic acid-based alkali-soluble resin.

The ratio of the alkali-soluble water-soluble resin to the styrene-based film-forming emulsion in the aqueous coating agent is preferably 10/90 to 30/70 in terms of the solid content mass ratio of the alkali-soluble water-soluble resin / styrene-based resin.

The present invention is also characterized in that a water resistant layer is formed by applying an alkali-soluble water-soluble resin, a styrene-based film-forming emulsion, and a water-based coating agent containing water to a portion exposed to the outside in a folded state. It is also a method of suppressing blocking in a crimped postcard in which an information recording surface provided with a pseudo-crimping layer on the surface is folded inward and crimped.

According to the present invention, there is provided a crimped postcard in the form of a removable sheet that can suppress the occurrence of blocking even when in contact with water.

FIG. 1 is a schematic view showing a crimping postcard 1 of the present invention, in which the left side of FIG. 1 shows the state before crimping and the right side of FIG. 1 shows the state after crimping. FIG. 2 is a schematic view showing a cross section of XX'in FIG.

Hereinafter, an embodiment of a crimped postcard of the present invention, an embodiment of a method for producing a printed matter of the present invention, and blocking in a printed matter crimped by folding an information recording surface provided with a pseudo crimping layer on the surface inward are suppressed. An embodiment of the method will be described. The present invention is not limited to the following embodiments or embodiments, and can be carried out with appropriate modifications within the scope of the present invention.

<Crimping postcard>
First, an embodiment of the crimping postcard of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view showing a crimping postcard 1 of the present invention, in which the left side of FIG. 1 shows the state before crimping and the right side of FIG. 1 shows the state after crimping. FIG. 2 is a schematic view showing a cross section of XX'in FIG. The crimped postcard 1 of the present invention is a printed matter in which an information recording surface 3 provided with a pseudo-adhesive layer 5 on the surface is folded inward and crimped. It is characterized by comprising a water resistant layer 6 formed of a soluble water-soluble resin, a styrene-based film-forming emulsion, and a water-based coating agent containing water. The crimped postcard of the present invention is not limited to a postcard size, and may be, for example, a sealed postcard or larger.

In the crimped postcard 1, the information recording surface 3 is formed by recording information on the sheet-shaped object 2 by printing or the like, and the pseudo-adhesive layer 5 is further formed on the surface of the information recording surface 3. Then, the information recording surface 3 can be folded inward and crimped at the folding line 11 along the length direction L at the substantially center of the width direction W. In the crimped postcard 1, an exposed portion 31 is formed at the end of the information recording surface 3, and the exposed portion 31 is used as a clue to perform pseudo-adhesion located between the pseudo-adhesive layers 5 and 5 facing each other in a folded state. The information recording surface 3 is exposed by being peeled off along the surface A.

The object to be printed 2 is made of paper, and printing can be performed on both sides thereof. For example, on the crimped postcard 1, information necessary for the inner surface when folded can be printed, while information such as an address can be printed on the outer surface when folded.

The pseudo-adhesive layer 5 is formed by means such as applying an active energy ray-curable varnish or pressure-sensitive glue for crimping, or applying a PP film, and crimps the pseudo-adhesive layers 5 with each other facing each other. Then, it becomes a peelable pseudo-adhesive state. Various types of varnishes and pressure-sensitive adhesives for forming the pseudo-adhesive layer 5 are commercially available, and such varnishes can be appropriately used.

A water resistant layer 6 is formed on the surface of the outer side surface 4. When the folded crimped postcard 1 comes into contact with water, the water-resistant layer 6 prevents the water from penetrating into the printed material 2 which is paper, and the pseudo-adhesive surface A of the folded crimped postcard 1 is formed. Suppresses blocking due to water adhesion.

The water resistant layer 6 is formed by forming a film of an alkali-soluble water-soluble resin and a styrene-based film-forming emulsion. Specifically, an alkali-soluble water-soluble resin, a styrene-based film-forming emulsion, and an aqueous coating agent containing water are applied to the outer surface 4, and dried to form a resin thin film. Plays a role as a water resistant layer 6. From the viewpoint that the alkali-soluble water-soluble resin and the styrene-based film-forming emulsion form a film to form a resin thin film having good water resistance, the glass transition temperature (Tg) of the styrene-based film-forming emulsion is 0 to 20 ° C. Is preferable. When the Tg is 0 ° C. or higher, the stickiness of the resin thin film formed on the surface of the outer surface 4 can be suppressed, which is preferable. When the Tg is 20 ° C. or lower, the particles of the styrene-based film-forming emulsion are formed. It is preferable because the film formation is good and a resin thin film having good water resistance is formed.

The styrene-based film-forming emulsion contained in the water-based coating agent has a core-shell structure consisting of a shell, which is a polymer having strong hydrophilicity and functioning as a polymer emulsifier, and a core made of a resin having a stronger hydrophobicity than the shell. Is preferable. The polymers constituting the shell and core include a styrene acrylic polymer which is a copolymer of styrene and acrylic acid, a styrene maleic acid polymer which is a copolymer of styrene and maleic acid, and a styrene maleic acid half ester polymer. Etc. are preferably mentioned. Among these, in particular, a water-soluble acrylic resin is used as a polymer emulsifier to copolymerize a monomer such as a styrene monomer, a monomer such as an alkyl ester of (meth) acrylic acid such as 2-ethylhexyl (meth) acrylate and butyl acrylate. Can be preferably mentioned. The shell portion and the core portion may be polymers of the same type or different types of polymers. As for the composition of the shell portion and the core portion, assuming that both are composed of a styrene acrylic polymer as an example, a polymer having a high acrylic acid ratio and a high acid value is preferably selected as the polymer constituting the shell. As the polymer constituting the core, a polymer having a high proportion of styrene and a low acid value is preferably selected. An emulsion containing such resin fine particles is prepared by performing emulsion polymerization in an aqueous solvent. As the preparation means, known ones can be used, and since such emulsions are commercially available, they may be used. In addition, in this specification, (meth) acrylic acid represents acrylic acid and / or methacrylic acid, and (meth) acrylate represents acrylate and / or methacrylate.

As described above, the Tg of the resin fine particles constituting the emulsion contained in the aqueous coating agent has a preferable range, but when the shell and the core have different polymers as described above, the Tg of the entire resin fine particles is used. , The theoretical glass transition temperature obtained by the following Wood equation can be adopted. The resin fine particles are prepared by emulsion polymerization as described above, and the glass transition temperature in that case is used to separate all ethylenically unsaturated monomers used for emulsion polymerization into a core portion and a shell portion. It represents the glass transition temperature of the copolymer obtained when copolymerized at one time without.

Wood formula: 1 / Tg = W ₁ / Tg ₁ + W ₂ / Tg ₂ + W ₃ / Tg ₃ + ... + W _x / Tg _x
(In the above formula, Tg _{1 to} Tg _x are the glass transition temperatures of the homopolymers of the monomers 1, 2, 3, ..., X constituting the copolymer, and W _{1 to} W _x are single amounts. The mass fractions and Tg of the polymers 1, 2, 3, ..., X represent the theoretical glass transition temperature. The glass transition temperature in Wood's equation is an absolute temperature.)

The acid value of the styrene-based film-forming emulsion is preferably about 30 to 100 mgKOH / g from the viewpoint of water resistance. The acid value referred to here is the theoretical neutralization amount of KOH for the amount of each ethylenically unsaturated monomer theoretically required to obtain 1 g of the copolymer, and the neutralization amount thereof. It is obtained by regarding the total mg number as the acid value (theoretical acid value) of the copolymer. The acid value is derived from the polymer emulsifier constituting the shell. For example, the acid value when a polymer emulsifier having an acid value of 100 mgKOH / g is contained in an amount of 10% by mass as the solid content ratio of the aqueous resin. Is 10 mgKOH / g. The acid value of the resin fine particles is more preferably about 30 to 70 mgKOH / g.

In the aqueous coating agent, the solid content of the styrene-based film-forming emulsion can be about 5 to 10% by mass, but is not particularly limited.

The water-based coating agent contains an alkali-soluble water-soluble resin in terms of coating suitability in addition to the styrene-based film-forming emulsion. The alkali-soluble water-soluble resin is made into a varnish dissolved in an alkaline aqueous solution and added to the aqueous coating agent. When the water-based coating agent contains such a varnish, viscosity is imparted and its coatability is enhanced. As the alkali-soluble water-soluble resin, at least one selected from the group consisting of a styrene acrylic polymer and a styrene maleic acid polymer is preferably mentioned, and a polymer having a high acid value having a high content of acrylic acid or maleic acid is used as ammonia water or the like. The one neutralized with the alkali of is preferably used. The weight average molecular weight of the water-soluble resin is preferably about 5,000 to 20,000. The acid value of the water-soluble resin may be about 100 to 300 mgKOH / g.

The ratio of the alkali-soluble water-soluble resin contained in the water-based coating agent to the styrene-based film-forming emulsion is about 10/90 to 30/70 in terms of the solid content mass ratio of the alkali-soluble water-soluble resin / styrene-based film-forming emulsion. Is preferably mentioned.

The water-based coating agent may contain various components in addition to the above-mentioned styrene-based film-forming emulsion and alkali-soluble water-soluble resin. Examples of such a component include wax, silica particles, antifoaming agent and the like.

Wax is added mainly to improve the abrasion resistance of the water resistant layer. Examples of the wax include polyethylene wax and polytetrafluoroethylene wax. As the average particle size of the wax, a numerical value calculated by the Coulter counter method is preferably about 1 to 10 μm, and more preferably about 4 to 8 μm. The amount of wax added to the aqueous coating agent is preferably about 3 to 10% by mass.

Silica is mainly added to reduce the gloss of the water resistant layer and improve the matte feeling. The amount of silica added to the aqueous coating agent is preferably about 1 to 5% by mass.

The defoaming agent suppresses the generation of air bubbles in the water-based coating agent and improves the leveling property of the water-based coating agent. When the water-based coating agent is applied to form the water-resistant layer, the water-resistant layer due to air bubbles It is added to suppress voids and improve coatability. Examples of the defoaming agent include commercially available acetylene-based dialcohol compositions. The amount of the defoaming agent added to the aqueous coating agent is preferably about 0.5 to 3% by mass.

When the water-based coating agent is applied to the surface to be the outer surface 4 to form the water-resistant layer 6, a known coating method can be used without particular limitation. Examples of such a coating method include coating using a gravure coater, coating using a spray, and the like. Among these, coating using a gravure coater is preferable.

As the water-based coating agent applied to the surface to be the outer side surface 4 dries, the particles of the styrene-based film-forming emulsion contained therein and the acrylic-soluble water-soluble resin form a film to form a resin thin film. As a result, the water resistant layer contains a resin derived from a styrene-based film-forming emulsion and an alkali-soluble water-soluble resin. When the applied aqueous coating agent is dried, known means such as natural drying and warm air drying can be used without particular limitation.

In the present invention, as described above, a water-resistant resin thin film is formed by applying an aqueous coating agent containing particles of a styrene-based film-forming emulsion and an alkali-soluble water-soluble resin. From the viewpoint of forming a water-resistant, gapless film, a means of applying UV varnish or the like and curing the film can be considered. However, when UV varnish is used, a certain film thickness is required to form a water-resistant film without gaps, and when this is applied to crimped postcards, the weight of the thick water-resistant layer may cause excessive weight. There is. In this respect, it is preferable to form a resin thin film using the above-mentioned water-based coating agent because a thin and light water-resistant layer can be formed.

The embodiment of the crimped postcard of the present invention has been described above by taking a double-folded (V-folded) crimped printed matter as an example, but it goes without saying that the present invention may be a Z-fold crimped postcard. ..

<Manufacturing method of printed matter>
Next, one embodiment of the method for producing a crimped postcard of the present invention will be described. This manufacturing method is a method for manufacturing the crimped postcard of the present invention, and the content of the description has much in common with the crimped postcard of the present invention already described. Therefore, in the following description, the description of the common parts with the crimped postcard of the present invention will be omitted, and the different parts will be mainly described.

The manufacturing method of the present invention is a method for manufacturing a crimping leaflet in which an information recording surface provided with a pseudo-crimping layer on the surface is folded inward and crimped, and an alkali is formed on the surface exposed to the outside in the folded state. It is characterized by comprising a step of forming a water resistant layer by applying a water-soluble coating agent containing a soluble water-soluble resin, a styrene-based film-forming emulsion and water. In addition, this step may be performed before the crimped postcard is folded, or may be performed after it is folded. The structure of the crimped postcard produced in this way is the same as that of the crimped postcard 1 of the present invention. The alkali-soluble water-soluble resin and the styrene-based film-forming emulsion are the same as the above-mentioned aqueous coating agent. That is, the manufacturing method of the present invention is characterized by including a step of forming a water resistant layer 6 on a surface to be the outer surface 4 of the crimped postcard 1. The method of applying the water-based coating agent to the outer surface 4 has already been described.

When the outer side surface 4 is printed, it is preferable that the above step of forming the water resistant layer 6 is performed after the printing. In the case of a crimped postcard, the address is printed on one of the two outer surfaces 4, and it is preferable that the above step is performed after the address is printed.

The styrene-based film-forming emulsion contained in the aqueous coating agent is selected from the group consisting of a styrene acrylic polymer having a glass transition temperature (Tg) of 0 to 20 ° C., a styrene maleic acid polymer, and a styrene maleic acid half ester polymer. It is preferably at least one kind. This has already been described in the explanation of the crimping postcard 1 above.

The alkali-soluble water-soluble resin contained in the aqueous coating agent is preferably a styrene acrylic and / or styrene maleic acid-based alkali-soluble resin. This is also as already described in the explanation of the crimping postcard 1 above.

The ratio of the alkali-soluble water-soluble resin to the styrene-based film-forming emulsion in the aqueous coating agent is preferably 10/90 to 30/70 in terms of the solid content mass ratio of the alkali-soluble water-soluble resin / styrene-based resin. .. This is also as already described in the explanation of the crimping postcard 1 above.

<A method of suppressing blocking in printed matter that has been crimped by folding the information recording surface having a pseudo-crimp layer on the surface inward>
Next, one embodiment of the method of suppressing blocking in a printed matter crimped by folding the information recording surface provided with the pseudo-crimping layer on the surface inward will be described. In this method, an alkali-soluble water-soluble resin, a styrene-based film-forming emulsion, and an aqueous coating agent containing water are applied to a portion exposed to the outside in a folded state to form a water-resistant layer on the portion. By applying the water-based coating agent to the outer surface as in the crimped postcard 1 of the present invention, the peelability of the pseudo-adhesive surface is maintained even when the printed matter comes into contact with water. That is, it suppresses blocking. Since this has already been described, the description here will be omitted. The "outer surface" is a surface that is arranged on the outside when it is folded into a crimped postcard shape, and the timing at which the water resistant layer is formed on this "outer surface" is folded. It may be before the crimped postcard shape is formed, or after it is folded into the crimped postcard shape.

Hereinafter, the present invention will be described in more detail by showing examples, but the present invention is not limited to the following examples.

[Preparation of varnish]
The product name JONRYL6610 (weight average molecular weight 8500, acid value 215 mgKOH / g) manufactured by BASF Corporation was used as a styrene acrylic alkali-soluble water-soluble resin varnish. This varnish contains an alkali-soluble water-soluble resin.

[Preparation of aqueous coating agent]
70 parts by mass of styrene acrylic emulsion (product name JONRYL7741 manufactured by BASF Co., Ltd.), 20 parts by mass of the above styrene acrylic alkali-soluble water-soluble resin varnish, 7 parts by mass of polyethylene wax, 3 parts by mass of silica powder, and acetylene dialcohol 1.5 parts by mass of the composition (manufactured by Air Products Japan Co., Ltd., product name SURFYNOL104E) was mixed to prepare an aqueous coating agent.

A commercially available UV varnish for crimped postcards (Curestar XUV-K3AP manufactured by Sakata Inx Corporation) is applied to the surface of the coated paper with a 200-wire hand proofer, which is then irradiated with ultraviolet rays to be cured to provide a pseudo-adhesive layer. I got a sheet. Next, this sheet was cut into 5 cm × 21 cm and folded in half so that the pseudo-adhesive layers overlap on the inside. The folded sheet was crimped with a 4-stage press stacker 15 mm winding to prepare a crimping sample. This procedure was repeated to prepare a total of 6 crimping samples.

The above-mentioned aqueous coating agent was applied to four pressure-bonded samples in a wet state to a thickness of 4 μm, 9 μm, 14 μm and 18 μm, respectively, and this was naturally dried at room temperature for 24 hours to form a water resistant layer on the outer surface. .. Further, a commercially available UVOP varnish was applied to one crimping sample to a thickness of 2 to 3 μm, and this was cured by ultraviolet rays to form a water resistant layer on the outer surface. The remaining one crimp sample did not form a water resistant layer.

For each of the above 6 crimping samples, a drop of water was dropped on the outer surface with a dropper and then left as it was, and the water was wiped off after a lapse of a specified time (10 seconds to 2100 seconds). The pseudo-adhesive surface of the crimping sample was peeled off, it was confirmed whether or not blocking occurred at the place where water was dripped, and the time required for blocking to occur was recorded. The results are shown in Table 1.

As shown in Table 1, it can be seen that it takes a considerable amount of time for the crimping samples (corresponding to the crimping postcards of the present invention) to which the water-resistant coating agent is applied to form the water-resistant layer. On the other hand, in the crimping sample in which the water resistant layer with UVOP varnish was formed with a thickness of 2 to 3 μm, which is practical for crimping postcards, blocking occurred overwhelmingly compared to the one using the water-based coating agent. You can see that the time is short. In the case of UVOP varnish, there is no big difference between the wet film thickness and the cured film thickness, but in the water-based coating agent, the film thickness after drying is significantly thinner than the wet film thickness due to the evaporation of water. Considering this, the excellence of the water resistant layer in the present invention formed by the water-based coating agent can be understood.

1 Crimping postcard 2 Printed material 3 Information recording surface 4 Outer side surface 5 Pseudo-adhesive layer 6 Water-resistant layer A Pseudo-adhesive surface

Claims (9)

This is a crimped postcard in which an information recording surface having a pseudo-adhesive layer on the surface is folded inward, and a water-resistant layer is provided on the surface exposed to the outside in the folded state. The water-resistant layer is alkali-soluble and water-soluble. A crimped postcard characterized by being formed of an aqueous coating agent containing a sex resin, a styrene-based film-forming emulsion, and water. The styrene-based film-forming emulsion is at least one selected from the group consisting of a styrene acrylic polymer, a styrene maleic acid polymer, and a styrene maleic acid half ester polymer having a glass transition temperature (Tg) of 0 to 20 ° C. Item 1. The crimping leaflet according to item 1. The crimping postcard according to claim 1 or 2, wherein the alkali-soluble water-soluble resin is a styrene acrylic and / or styrene maleic acid-based alkali-soluble resin. The ratio of the alkali-soluble water-soluble resin contained in the aqueous coating agent to the styrene-based film-forming emulsion is 10/90 to 30/70 in terms of the solid content mass ratio of the alkali-soluble water-soluble resin / styrene-based film-forming emulsion. The crimping leaflet according to any one of claims 1 to 3, characterized in that there is. A method for manufacturing crimped postcards in which an information recording surface provided with a pseudo-crimping layer is folded inward and crimped. The surface exposed to the outside in the folded state is an alkali-soluble water-soluble resin or styrene-based. A method for producing a pressure-bonded postcard, which comprises a step of forming a water-resistant layer by applying a film-forming emulsion and an aqueous coating agent containing water. The styrene-based film-forming emulsion is at least one selected from the group consisting of a styrene acrylic polymer, a styrene maleic acid polymer, and a styrene maleic acid half ester polymer having a glass transition temperature (Tg) of 0 to 20 ° C. Item 5. The method for producing a crimped leaflet according to Item 5. The method for producing a pressure-bonded post according to claim 5 or 6, wherein the alkali-soluble water-soluble resin is a styrene acrylic and / or styrene maleic acid-based alkali-soluble resin. The ratio of the alkali-soluble water-soluble resin to the styrene-based film-forming emulsion in the aqueous coating agent is 10/90 to 30/70 in terms of the solid content mass ratio of the alkali-soluble water-soluble resin / styrene-based resin. The method for producing a crimping leaf according to any one of claims 5 to 7. Pseudo-bonding is characterized in that a water-resistant layer is formed by applying an alkali-soluble water-soluble resin, a styrene-based film-forming emulsion, and an aqueous coating agent containing water to a portion exposed to the outside in a folded state. A method of suppressing blocking in a crimped postcard in which an information recording surface having a layer on the surface is folded inward and crimped.

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