JP2001262097A - Pressure-sensitive adhesive composition excellent in fixability of inkjet ink and sheet for carrying information using the same - Google Patents

Abstract

(57) [Problem] To provide a pressure-sensitive adhesive composition which is excellent in water resistance of a printed inkjet ink, does not cause ink offset, and has excellent ink fixability. And an information carrying sheet having an adhesive layer of the pressure-sensitive adhesive composition. SOLUTION: With respect to a natural rubber-based adhesive base and 100 parts by mass of the adhesive base, it shows incompatibility with the adhesive base, and has an average particle diameter of 1 to 5 µm and an oil absorption of 100 m.
A pressure-sensitive adhesive composition is used in which 1/100 g or more of silica gel is mixed in a ratio of 10 to 50 parts by mass and a cationic substance in a ratio of 10 to 50 parts by mass.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure-sensitive adhesive composition excellent in fixability of an ink-jet ink and an information carrying sheet using the same, and more particularly, to a surface laminated by folding or cutting. Information transmission sheet such as a foldable sheet, which is used as an information carrying surface, a confidential information transmission sheet such as a superimposed sheet, an arrangable sheet which can be expanded in size, an office sheet such as copy paper, and the like. The present invention relates to a pressure-sensitive adhesive composition having excellent fixability of an inkjet ink.

[0002]

2. Description of the Related Art Conventionally, in an information carrying sheet that carries information on a superposed surface, a base sheet is usually formed in a pattern such that the superposed surfaces are in contact with each other so that the superposed surfaces are bonded to each other. An adhesive layer of a pressure-sensitive adhesive is provided on the entire surface, a specific portion, or a line of the overlapping surface. This pressure-sensitive adhesive is also called self-adhesive pressure-sensitive adhesive,
By applying a high pressure while the adhesive layers are in contact with each other, the mutual polymers adhere to each other by self-diffusion. Depending on the type of the composition and the degree of pressure, permanent adhesion or re-peeling is performed. It embodies the adhesiveness.

Conventionally, the main component of the pressure-sensitive adhesive used in this type of information-carrying sheet is generally an adhesive base containing a methyl methacrylate graft copolymerized natural rubber-based adhesive as a main component, and Fine adhesive such as starch is blended with the adhesive base.

[0004]

However, in the conventional pressure-sensitive adhesive, after the ink is printed on the adhesive layer by an ink jet printer, the ink peels off when the printed portion gets wet or comes into contact with water. In addition to the poor water resistance, the information carrying sheet adhered by applying high pressure while the adhesive layer printed with inkjet ink and the adhesive layer not printed with inkjet ink are in contact with each other, There is a problem that the printed ink-jet ink is transferred to the adhesive layer side where the ink-jet ink is not printed (ink offset).

A first object of the present invention is to solve the conventional problems, to improve the water resistance of an ink jet ink printed on an adhesive layer, and to provide a pressure-sensitive adhesive that can be peeled off without causing ink offset. A second object of the present invention is to provide an information carrying sheet using such a pressure-sensitive adhesive composition having excellent fixability of an inkjet ink.

[0006]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, a natural rubber-based adhesive base and a specific average particle size and It has been found that the use of a pressure-sensitive adhesive composition in which specific amounts of silica gel and a cationic substance having an oil absorption amount are blended, respectively, can provide a pressure-sensitive adhesive composition having excellent fixability of an ink-jet ink, thereby completing the present invention. Reached.

That is, the pressure-sensitive adhesive composition according to the first aspect of the present invention, which has excellent fixability of an ink-jet ink,
An adhesive layer that is applied to the superposed surfaces of the sheet and does not adhere in a normal state by a drying process is formed, and the superposed surfaces can be separated from each other by applying a predetermined pressure by bringing the superposed surfaces into contact with each other. A pressure-sensitive adhesive composition to be adhered, comprising a natural rubber-based adhesive base, 100 parts by mass of the adhesive base, and non-affinity for the adhesive base, and an average particle size 1-5μm, oil absorption 100m
It is characterized in that 1/100 g or more of silica gel is blended in a ratio of 10 to 50 parts by mass and a cationic substance is blended in a ratio of 10 to 50 parts by mass.

Further, as a particularly preferred pressure-sensitive adhesive composition having excellent fixability of an ink jet ink, the natural rubber adhesive base according to claim 2 of the present invention is a natural rubber adhesive which is a methyl methacrylate graft copolymer. Substrate solid content 1
The mixture is characterized by being a mixture of styrene-rich SBR latex having a styrene content of 40 to 70% and a solid content of 5 to 50 parts by mass in 00 parts by mass.

According to a third aspect of the present invention, there is provided a pressure-sensitive adhesive composition excellent in fixability of the ink-jet ink according to the first or second aspect, wherein the information-bearing sheet according to the third aspect of the present invention is provided on a predetermined portion of the superposed surface of the base sheet. Characterized by having an adhesive layer of

A specific natural rubber-based adhesive base obtained by blending a styrene-rich SBR latex with a natural rubber-based adhesive base, particularly a methyl methacrylate graft copolymerized natural rubber-based adhesive, When a specific amount of silica gel and a cationic substance having a specific average particle size and oil absorption are blended in a specific amount, the required performance such as printability can be maintained without impairing other necessary properties such as printability. The water resistance is improved and the ink offset phenomenon does not occur.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The natural rubber-based adhesive base used in the pressure-sensitive adhesive composition of the present invention is, for example, any of those conventionally used as a base for a natural rubber-based adhesive. You can choose. Examples of such a material include a latex containing natural rubber as a main component, a modified product thereof, for example, an acid latex, a depolymerized latex, a vulcanized latex or a grafted natural rubber latex, and the like. Examples thereof include a styrene-rich SBR latex, a polystyrene emulsion, and a mixture in which one or more of styrene-acrylic copolymer emulsions are blended in an appropriate amount. Among natural rubber latexes, particularly in terms of blocking resistance, heat resistance, abrasion resistance, etc., natural rubber latex obtained by graft copolymerizing methyl methacrylate on natural rubber, and styrene and methyl methacrylate on natural rubber And natural rubber latex obtained by graft copolymerization of

The natural rubber-based adhesive base in the pressure-sensitive adhesive composition of the present invention has a styrene content of 40 to 70% based on 100 parts by mass of a solid base material of a methyl methacrylate graft copolymerized natural rubber-based adhesive. The styrene-rich SBR latex is blended so that the solid content thereof is 5 to 50 parts by mass. Since the water resistance of the printed inkjet ink is further improved and the fixability to the base sheet is excellent, It is preferably used. Styrene-rich SBR
Latex is a synthetic rubber latex generally used as a component of an adhesive, and has a styrene content of 40 to 40.
This is an emulsion in which 70% styrene-rich SBR is dispersed in an aqueous solvent. The reason for limiting the styrene content is that if the styrene content is less than 40%, the fixability to a base sheet such as paper may be too large, and if it exceeds 70%, the fixability to a base sheet such as paper may be deteriorated. Because there is.

Specific examples of commercially available styrene-rich SBR latex used in the pressure-sensitive adhesive composition of the present invention include, for example, Nipol LX415A and LX430 (manufactured by Zeon Corporation), Asahi Kasei latex DL636 and D
L620, L-2923 (manufactured by Asahi Kasei Corporation), Closlen SK72 (manufactured by Takeda Pharmaceutical Co., Ltd.) and the like can be mentioned.

An emulsifier is required to stabilize the dispersion of the styrene-rich SBR latex particles. The emulsifier is generally an anionic interface such as rosin soap, naphthalene sulfonate, fatty acid soap, and alkylbenzene sulfonate. An activator is used.

The mixing ratio of the styrene-rich SBR latex is such that the solid content is 5 to 50 parts by mass, preferably 10 to 50 parts by mass with respect to 100 parts by mass of the solid content of the natural rubber-based adhesive base material.

The natural rubber-based adhesive used in the light-sensitive adhesive composition of the present invention may contain, if desired, additives commonly used in adhesives, such as tackifiers, viscosity modifiers, and the like.
Anti-aging agents, stabilizers, coloring agents and the like can be added.

In the pressure-sensitive adhesive composition of the present invention, 10 to 50 parts by mass of silica gel having an average particle diameter of 1 to 5 μm and an oil absorption (JIS K5101) of 100 ml / 100 g or more, based on the natural rubber adhesive base. While blending
It is necessary to mix 10 to 50 parts by mass of a cationic substance. Average particle size of silica gel less than 1 μm or 5
If it exceeds μm, water resistance and ink offset may not be improved, and particularly, the oil absorption of silica gel is 100 ml /
If it is less than 100 g, water resistance and ink offset are not improved. Average particle size 1-5 μm, oil absorption 100ml / 1
It is considered that by using a predetermined amount of silica gel of at least 00 g, the adsorbability of the inkjet ink is improved, and the water resistance and the ink offset are improved.

In the present invention, other than silica gel, other finely divided fillers can be blended with the natural rubber adhesive base. As such a fine-grained filler, it is preferable to use a filler which has no affinity with the adhesive base or is extremely small and which is hardly dissolved in the adhesive base.

Other finely divided fillers include, for example, fine spherical acrylic resin, fine spherical methacrylic resin, fine spherical polyethylene, spherical alumina, glass powder, shirasu balloon, natural zeolite, synthetic zeolite, calcium carbonate, activated clay and the like. Can be These fine particulate fillers may be used alone or in combination of two or more.

The cationic substance to be incorporated in the pressure-sensitive adhesive composition of the present invention is a monomer, oligomer or polymer of a primary to tertiary amine or quaternary ammonium salt which dissociates when dissolved in water to exhibit a cationic property. And preferably
It is an oligomer or a polymer. As particularly preferred examples of the cationic substance, specifically, for example, dimethylamine / epichlorohydrin polycondensate, acrylamide / diallylamine copolymer, polyvinylamine copolymer, dicyandiamide, a compound containing dimethyldiallylammonium chloride as a main component Alternatively, a mixture of two or more of these can be mentioned. As the cationic substance in the present invention, a cationic resin is preferably used, and a commercially available one can be suitably used.

Specific examples of commercially available cationic resins include:
For example, dicyandiamide-based SunFix 70 manufactured by Sanyo Kasei Kogyo Co., Ltd., specially modified polyamine-based Polyfix 700 manufactured by Showa Polymer Co., Ltd., polyamide epichlorohydrin-based polyfix 301A, Nichika Chemical Industry Co., Ltd.
Polyamine-based Neofix RP-7
0, a quaternary ammonium salt type Charol DC-902P manufactured by Daiichi Kogyo Seiyaku Co., Ltd., and the like.

The proportion of the cationic substance blended in the pressure-sensitive adhesive composition of the present invention varies depending on the type of an anionic substance such as an ink-jet ink, a base sheet such as paper, and a pressure-sensitive adhesive base. It is not particularly limited. However, the adhesiveness of the information-carrying sheet of the present invention, without adversely affecting the blocking resistance, heat and abrasion resistance, etc., water resistance, a favorable proportion of the cationic substance for improving the offset phenomenon in the adhesive base for improving the offset phenomenon. Is the adhesive base 100
It is 10 to 50 parts by mass with respect to parts by mass. If the amount is less than 10 parts by mass, the water resistance and the offset phenomenon may not be improved. If the amount is more than 50 parts by mass, the water resistance and the offset phenomenon are improved, but the printability is deteriorated.

The pressure-sensitive adhesive composition of the present invention is applied to the base sheet surface by an application means such as a gravure coater, flexo, air knife coater, bar coater, etc., and is folded in two, three, folded or cut, or separated from each other. It can be suitably used for postcards, spreadsheets, notices, various cards, etc., which have a double-sided surface that is temporarily adhered in various forms such as superposition, but can be easily peeled off as needed.

Next, as the substrate sheet to which the adhesive composition of the present invention is applied, synthetic paper or a synthetic film of polyethylene, polyethylene terephthalate, polypropylene, vinyl chloride or the like may be used in addition to ordinary paper. it can. When using these synthetic films, the surface of the base sheet is preferably subjected to a surface treatment such as a mat treatment or a corona treatment. The amount of the adhesive composition applied to the substrate sheet surface is 1 to 30 g / m ² , preferably 3 to maintain the adhesiveness, peelability or transparency of the adhesive layer.
-20 g / m ² , more preferably 5-15 g / m ² . Furthermore, by pressing the formed peelable adhesive layer with a pressure roller at about 1 to 10 kg / cm ² , the blocking resistance can be further improved.

Examples of the ink jet recording ink which can be used in the present invention include, for example, JP-A-7-2
Nos. 28808 and 7-228809 can be used. In particular, anthraquinones,
Benzoquinone, naphthoxyquinone, xanthene,
Triphenylmethane, quinoline, indigoid,
At least one anionic ink selected from the group consisting of azine, oxazine, thiazine and methine dyes is preferably used. These specific examples are illustrated in paragraph No. 0015 of JP-A-7-228809. As a medium used for this ink, a mixed solvent of water and a water-soluble organic solvent can be used.
In addition, a pH adjuster, a viscosity adjuster, a surface tension adjuster and the like can be contained.

Next, the configuration of the information carrying sheet of the present invention will be described in detail with reference to the accompanying drawings. Here, FIG.
FIG. 2 is a front view of the three-fold postcard of the present invention, FIG. 2 is a rear view of the postcard, FIG. 3 is a cross-sectional view taken along line XX of FIG.
FIG. 5 is an explanatory view of the state when the postcard of FIG. 1 is folded, FIG. 5 is a front view of the folded postcard of the present invention, FIG. 6 is a developed view of the back side of the postcard, and FIG. 8 and FIG. 8 are front development views of the partially folded postcard according to the present invention, FIG. 9 is a rear development view of the postcard, and FIG. 10 is a state explanatory view when the postcard of FIG. 8 is folded.

First, a three-fold postcard 1 shown in FIGS. 1 to 3 is composed of a base sheet 2 having a size three times the size of a standard postcard, and is divided into three regions by folding lines 3a and 3b. is there. On the front surface of the left section area A, print destination information such as a zip code, a destination name, and an address.
However, concealment information prints 5 are printed directly on the base sheet 2 on the front and back surfaces of the central partitioned area B and on the front face of the right partitioned area C. Further, the pressure-sensitive adhesive composition of the present invention is applied to the entire front surfaces of the divided regions B and C and the whole back surfaces of the divided regions A and B of the printed base sheet 2 by the adhesive layer 6 which can be peeled off. Is formed. As shown in FIG. 4, the tri-fold postcard 1 configured as described above folds the overlapping surface of each section into a Z-shape along the folding lines 3a and 3b to bring the adhesive layers into contact with each other. By pressing with a sealer, the adhesive layer 6 is activated and adhered.

Next, a two-fold postcard 11 shown in FIGS. 5 and 6 is composed of a base sheet 2 having a size twice as large as a standard postcard, and is divided into two regions D and E by a folding line 3 at the center. It is what is divided. A destination information print 4 such as a postal code, a destination name and an address is printed on the front surface of the left section area D, and a concealment information print 5 is printed directly on the base sheet 2 on the back sides of the section areas D and E. . further,
The pressure-sensitive adhesive composition of the present invention is applied to the entire back surface of the divided areas D and E of the printed base sheet 2 to form a peelable adhesive layer 6. As shown in FIG. 7, the two-fold postcard 11 configured as described above is folded and pressed at the fold line 3 so that the adhesive layers on the right and left rear surfaces are in contact with each other, similarly to the above-described three-fold postcard. The adhesive layer 6 is activated and adhered.

8 and 9 is composed of a base sheet 2 having a size 1.5 times the size of a standard postcard. And G. The postal code, address,
A destination information print 4 such as an address, and a concealment information print 5 is printed directly on the base sheet 2 on the back surface of the right side divided area G. Further, the pressure-sensitive adhesive composition of the present invention is applied to the entire back surface of the partitioned area G of the printed base sheet 2 and a part of the back face of the partitioned area F which is overlapped when the partitioned area G is folded along the folding line 3. Adhesive layer 6 to which object is applied and which can be peeled off
Are formed. As shown in FIG. 10, the partially folded postcard 21 configured as described above is folded and pressed at the folding line 3 so that the adhesive layers on the back surfaces of the left and right sections are in contact with each other, similarly to the above-described two-fold postcard. Thereby, the adhesive layer 6 is activated and adhered.

Further, since the peelable adhesive layer formed by the composition of the present invention itself also has a receptivity for printing ink and toner, a normal printing device or a non-impact printer may be further provided on the surface thereof if necessary. Can print additional information (not shown).

[0031]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. (Example 1) As a natural rubber-based adhesive base, natural rubber 1
MMA copolymerized natural rubber emulsion 100 obtained by mixing and graft grafting 00 parts by mass and 25 parts by mass of MMA
Styrene-rich SBR latex (Nipol LX415A, manufactured by Zeon Corporation) based on parts by mass (solid content)
Using a mixture of 0 parts by mass, silica gel (Cycilia 310, manufactured by Fuji Silysia Chemical Ltd.) (average particle size: 1.4 μm, oil absorption) based on 100 parts by mass (solid content) of the natural rubber-based adhesive base 310 ml / 100 g) or silica gel (Nip Gel AZ204, manufactured by Nippon Silica Industry Co., Ltd.) (average particle size 1.3 μm, oil absorption 355 ml /
100 g) 10 parts by mass, 10 parts by mass of cationic resin (Sunfix 70, manufactured by Sanyo Chemical Industries, Ltd.), starch 1
The pressure-sensitive adhesive composition of the present invention was prepared by mixing 50 parts by mass.

The pressure-sensitive adhesive composition of the present invention was applied to a
It was applied to 0 kg of coated paper (substrate sheet) at a rate of 10 g / m ² by a gravure offset method to form an adhesive layer, and then heated at 120 ° C. for 30 seconds and dried. The water resistance, ink offset, and appearance of the information carrying sheet thus produced were evaluated by the following methods, and the evaluation results are shown in Table 1.

(1) Water resistance of the ink: Black print was made on the surface of the adhesive composition by using a color inkjet printer (trade name: MJ-700V2C, manufactured by Epson Corporation) on the test sample (sheet for carrying information) immediately after preparation. After performing solid color printing of black ink), heat fixation is performed, and the printed portion is washed away with running water for a certain period of time, or a water drop is dropped on the printed portion for a certain period of time, and then wiped off to visually determine the state of the ink. When the print was completely left, it was judged as 、, when the print was almost completely left, it was judged as ○, when the print was a little thinner or so, and when the print was thinner, it was judged as x.

(2) Ink offset: A black print (black) was formed on the surface of the adhesive composition using a color inkjet printer (trade name: MJ-700V2C, manufactured by Epson Corporation) on the test sample (information carrying sheet) immediately after preparation. Ink), after performing solid color printing, heat-fixing, folding it into a V-shape so that the adhesive composition surface is on the inside to make it a postcard size (10 cm x 15 cm), and a pressure roller with variable clearance (Japan) SP40 manufactured by ADM
After passing through 1), it was integrated by pressure bonding to obtain a folded folded postcard. The pressure was adjusted on the clearance scale. After crimping, it was cut into strips with a width of 25 mm and peeled again at a peeling speed of 300 mm / min using a Tensilon universal tensile tester. Thereafter, the state of printing was visually determined. ◎ indicates that the solid printing shape remains exactly and the offset phenomenon has not occurred at all, も の indicates that the offset phenomenon hardly occurs, and 、 indicates that the printing is slightly transferred to the adhesive composition surface opposite to the printed surface. When the offset phenomenon occurred slightly, the sample was evaluated as Δ, and when the printed image was transferred to the surface of the adhesive composition opposite to the printed surface, and the offset phenomenon was clearly observed, the sample was evaluated as ×.

(3) Appearance: The state of the print printed as described above was visually evaluated for color tone and sharpness. Those with good color and sharpness were evaluated as ◎, those with almost acceptable color and sharpness were evaluated as ○, those with slightly poor color and sharpness were evaluated as Δ, and those with poor color and sharpness were evaluated as x.

(Examples 2 to 3) The water resistance, ink offset and appearance of the ink were evaluated in the same manner as in Example 1 except that the pressure-sensitive adhesive composition of the present invention was prepared according to the formulations shown in Table 1. Table 1 shows the results.

(Examples 4 to 6) In the same manner as in Examples 1 to 3 except that Nip Gel AZ600 (manufactured by Nippon Silica Industry Co., Ltd.) (average particle size: 5.0 μm, oil absorption: 315 ml / 100 g) was used as silica gel. Table 1 shows the results of the evaluation of the ink water resistance, ink offset, and appearance.

(Examples 7 to 9) In the same manner as in Examples 1 to 3, except that Nipgel CX200 (manufactured by Nippon Silica Industry Co., Ltd.) (average particle size: 1.7 μm, oil absorption: 115 ml / 100 g) was used as silica gel. Table 1 shows the results of the evaluation of the ink water resistance, ink offset, and appearance.

(Comparative Examples 1 to 3) In the same manner as in Examples 1 to 3, except that Cysilia 730 (manufactured by Fuji Silysia Chemical Ltd.) (average particle size: 3.0 μm, oil absorption: 95 ml / 100 g) was used as silica gel. Table 2 shows the evaluation results of the ink water resistance, ink offset, and appearance.

(Comparative Examples 4 to 6) In the same manner as in Examples 1 to 3, except that Nip Gel CX600 (manufactured by Nippon Silica Industry Co., Ltd.) (average particle size: 6.0 μm, oil absorption: 100 ml / 100 g) was used as silica gel. Table 2 shows the evaluation results of the ink water resistance, ink offset, and appearance.

(Comparative Examples 7 to 9) Nip Gel AZ204 (manufactured by Nippon Silica Industry Co., Ltd.) (average particle size: 1.3 μm, oil absorption: 355 ml / 100 g) was used as silica gel.
Table 2 shows the results of evaluating the water resistance, ink offset, and appearance of the ink in the same manner as in Examples 1 to 3 except that the formulations shown in Table 2 were used.

Comparative Example 10 Nip gel AZ204 (manufactured by Nippon Silica Industry Co., Ltd.) (average particle size: 1.3 μm, oil absorption: 355 ml / 100 g) was used as silica gel, and the cationic resin was changed to 60 parts by mass. Table 2 shows the results of evaluating the water resistance, ink offset and appearance of the ink in the same manner as in Example 2.

[0043]

[Table 1]

[0044]

[Table 2]

From Table 1, it can be seen that the pressure-sensitive adhesive compositions of the present invention of Examples 1 to 9 are excellent in printability and also excellent in water resistance, ink offset and appearance, and no offset phenomenon occurs. I understand. In contrast, from Table 2, the pressure-sensitive adhesive compositions for comparison of Comparative Examples 1 to 9 are:
Although it has excellent printability, many of them have poor ink water resistance. Even when the ink water resistance is ◎ or ○, the offset phenomenon occurs when the ink offset is △ or ×, and it can be seen that some inks have poor appearance. Further, the pressure-sensitive adhesive composition for comparison between Comparative Example 9 in which 60 parts by mass of silica gel was mixed and Comparative Example 10 in which 60 parts by mass of cationic resin was mixed had poor printability.

[0046]

The pressure-sensitive adhesive compositions according to claims 1 and 2 of the present invention are excellent in printability and water resistance of the printed ink-jet ink, and have good appearance (color and sharpness). ), The ink offset does not occur, and a remarkable effect that the fixing property of the inkjet ink is excellent is exhibited.

The information carrying sheet according to the third aspect of the present invention is economically and advantageously obtained at a low production cost, is recordable by an ink jet recording method, and is hidden inside by peeling off its interface. The information recorded on the surface of the pressure-sensitive adhesive composition is transferred to the opposite adhesive surface when the interface is peeled off. No offset phenomenon occurs.

[Brief description of the drawings]

FIG. 1 is a surface development view of a three-fold postcard according to the present invention.

FIG. 2 is a developed rear view of the postcard of FIG. 1;

FIG. 3 is a sectional view taken along line XX of FIG. 1;

FIG. 4 is an explanatory view of the state when the postcard of FIG. 1 is folded.

FIG. 5 is a surface development view of the two-fold postcard of the present invention.

FIG. 6 is a developed rear view of the postcard of FIG. 5;

FIG. 7 is an explanatory diagram of a state when the postcard of FIG. 5 is folded.

FIG. 8 is a surface development view of a partially folded postcard according to the present invention.

FIG. 9 is a developed rear view of the postcard of FIG. 8;

FIG. 10 is an explanatory view of the state when the postcard of FIG. 8 is folded.

[Explanation of symbols]

 2, 12, 22 Base sheet 3, 3a, 3b Folding line 5 Concealment information printing 6 Peelable adhesive layer

Continuation of the front page F term (reference) 2C005 WA02 4J040 CA021 CA082 DA022 DB052 DF032 DF092 EC162 HA136 HA196 HA296 HA306 HA346 HC01 JA03 JA09 JB09 KA03 LA07 MA09 MA10 MB09 NA21

Claims (3)

[Claims] 1. An adhesive layer which is applied to a superposed surface of a sheet and which does not adhere in a normal state by a drying process is formed, and the superposed surfaces are brought into contact with each other and a predetermined pressure is applied thereto, whereby the superposed surface is formed. A pressure-sensitive adhesive composition for releasably adhering each other, wherein a natural rubber-based adhesive base and 100 parts by mass of the adhesive base have an average particle diameter of 1 to 5 μm and an oil absorption of 100 ml / 100 g. 10 to 50 parts by mass of the above silica gel and 10 parts by mass of the cationic substance
A pressure-sensitive adhesive composition excellent in fixability of an ink-jet ink, wherein the pressure-sensitive adhesive composition is blended in an amount of 50 to 50 parts by mass. 2. The natural rubber-based adhesive base has a methyl methacrylate graft copolymerized natural rubber-based adhesive base material solid content of 10%.
2. The ink-jet printer according to claim 1, wherein the mixture is a mixture of 0 parts by mass of a styrene-rich SBR latex having a styrene content of 40 to 70% and a solid content of 5 to 50 parts by mass. A pressure-sensitive adhesive composition having excellent ink fixability. 3. An information carrying sheet having an adhesive layer of the pressure-sensitive adhesive composition according to claim 1 or 2 at a predetermined portion of a superposed surface of a base sheet.