JP2005105218A - Odor-reduced pressure sensitive adhesive composition and sheet using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a new pressure sensitive adhesive composition which, when coated on a substrate sheet, forms an adhesive layer having an adequate releasable adhesion and giving off no odor on heating and a sheet using the composition. <P>SOLUTION: When coated on the superimposed areas of sheets, the pressure sensitive adhesive composition forms adhesive layers on drying which do not adhere in a normal state. The superimposed areas are releasably bonded together by placing the superimposed areas face to face and putting a specific amount of pressure on the areas. The odor-reduced pressure sensitive adhesive composition is composed of a natural rubber-based aqueous emulsion type adhesive base material mixed with an effective amount of a terpene-based neutralizing and deodorizing agent having the activity of selectively neutralizing and deodorizing odor. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an odor-reducing pressure-sensitive adhesive composition and a sheet using the odor-reducing adhesive composition, and more particularly, to an information having an odor-reducing pressure-sensitive adhesive composition and a peelable adhesive layer formed by applying this to a substrate sheet surface. Sheets for carrying, etc., that is, folding sheets having a facing surface that is temporarily bonded but can be easily peeled off as needed, superposed sheets, for example, postcards with confidentiality such as information hiding sheets, notices, It relates to sheets such as cards.

  In recent years, with the revision of the Postal Law, postcard systems with confidentiality have been put into practical use and are widely used. This confidential postcard system can be used for various kinds of wrapping, such as folding personal information, postcards that contain various information such as print information and print information, or stacking them together. In the mating mode, the information is peelably bonded and the information is concealed and then mailed, and the recipient peels the overlapping surface again to read the concealment information.

As a sheet for information carrying used in a postcard system, for example, a pressure-sensitive adhesive comprising an adhesive base on a superposed surface of a base sheet and a fine particle filler showing non-affinity with the adhesive base One having an adhesive layer made of an agent composition is known (for example, see Patent Document 1).
However, the conventional sheet for carrying information is formed from the pressure-sensitive adhesive composition when printing with a non-impact printer in which the ink is dried to dry the ink in the printing process or the toner is heated and fixed. There is a problem that a pressure-sensitive adhesive composition that does not generate an odor and a sheet for information carrying provided with an adhesive layer made of such a pressure-sensitive adhesive composition is required. It has been. Therefore, the following method has been proposed.

(1) A deodorizing device is installed in a sheet-fed commercial printing machine that performs ultraviolet irradiation.
(2) A fragrance is mixed in the pressure-sensitive adhesive composition to mask odor.
(3) A deodorant is blended in the dampening water of the printing press (see Patent Document 2).

However, the method (1) is disadvantageous in that the deodorizing apparatus is very expensive, and a large space is required because the apparatus is large. The method (2) is a mixture of odors from information-carrying sheets and fragrances, and some people dislike the odors of the fragrances themselves. There is a drawback that cannot be fundamentally solved. In addition, the method (3) has a drawback that an excellent effect cannot be expected due to a small amount of the fountain solution, and there is a possibility that the printing suitability and the quality may be adversely affected.
JP-A-4-59395 JP 61-270193 A

The first object of the present invention is to apply pressure-sensitive adhesive when printing using a non-impact printer that solves the conventional problems and irradiates ultraviolet rays to dry the ink in the printing process or heats and fixes the toner. Pressure-sensitive adhesive composition that does not emit odor even when the adhesive layer made of the adhesive composition is heated, is excellent in printability, and can easily form an adhesive layer that can be easily peeled off on the overlapping surface of the base sheet Is to provide
A second object of the present invention is a sheet in which an adhesive layer is formed on an overlapping surface of a substrate sheet using such a novel pressure-sensitive adhesive composition, and the adhesive layer is made of a pressure-sensitive adhesive composition. An object of the present invention is to provide a sheet that does not emit odor even when heated, and is used for carrying hidden information.

  As a result of intensive research on the pressure-sensitive adhesive composition for the sheet for supporting the concealment information, the present inventors have conducted a specific terpene-based neutralization dehydration with respect to the natural rubber-based aqueous emulsion type adhesive base. The present inventors have found that the problems can be solved by using a pressure-sensitive adhesive composition containing an agent.

That is, claim 1 of the present invention forms an adhesive layer that is applied to the overlapping surface of the sheet and does not adhere in a normal state by a drying process, and applies a predetermined pressure by bringing the overlapping surfaces into contact with each other. A pressure-sensitive adhesive composition for releasably bonding the overlapping surfaces,
An odor-reducing pressure-sensitive adhesive composition comprising an effective amount of a terpene-based neutralized deodorant having a neutralizing and deodorizing action selectively with respect to odors to a natural rubber-based aqueous emulsion type adhesive base It is a thing.

  A second aspect of the present invention is the pressure-sensitive adhesive composition according to the first or second aspect, wherein the natural rubber-based aqueous emulsion is a natural product obtained by graft copolymerization of a modified natural rubber-based aqueous emulsion and methyl methacrylate. Acrylic copolymer type natural rubber aqueous emulsions such as rubber latex, natural rubber latex obtained by graft copolymerization of styrene and methyl methacrylate on natural rubber, and styrene-rich SBR latex and polystyrene for these natural rubber latex It is at least one selected from a mixture containing one or more of emulsion and styrene / acrylic copolymer emulsion.

  Claim 3 of the present invention is the pressure-sensitive adhesive composition according to claim 1 or 2, wherein 100 parts by mass (solid content) of a natural rubber-based aqueous emulsion type adhesive base is contained in the terpene system. It is characterized by blending 0.001 to 0.1 parts by mass of a Japanese deodorant.

  A fourth aspect of the present invention is a sheet having the adhesive layer of the pressure-sensitive adhesive composition according to any one of the first to third aspects at a predetermined portion of the overlapping surface of the base sheet.

The pressure-sensitive adhesive composition of the present invention contains an effective amount of a terpene neutralizing deodorant having a neutralizing and deodorizing action selectively with respect to odors with respect to a natural rubber aqueous emulsion type adhesive base. When printing using a non-impact printer that heats and fixes the toner in order to dry the ink in the printing process, the odor will be generated even if the adhesive layer made of the pressure-sensitive adhesive composition is heated. It is possible to form a peelable adhesive layer on the superposed surface of the base sheet easily and at a low cost without impairing the adhesive force.
By using a natural rubber-based aqueous emulsion type adhesive base instead of a solvent system that uses an organic solvent as an adhesive base, the coating volatility is low and the coating amount can be easily adjusted. In addition to being excellent in suitability, it is harmless to the human body because the solvent is water, is not flammable, and does not require exposure equipment or the like in the coating process or drying process.

  Claim 2 of the present invention is the pressure-sensitive adhesive composition according to claim 1, wherein the natural rubber-based aqueous emulsion is a modified natural rubber-based aqueous emulsion, a natural rubber latex obtained by graft copolymerization with methyl methacrylate, Acrylic copolymer type natural rubber aqueous emulsion such as natural rubber latex obtained by graft copolymerization of styrene and methyl methacrylate on natural rubber, and styrene-rich SBR latex, polystyrene emulsion, styrene It is characterized in that it is at least one selected from a mixture containing one or more acrylic copolymer emulsions, and the adhesive layer made of a pressure-sensitive adhesive composition using these is heated. Select against odors even if acidic substances that cause odors are generated Because are effective amount of terpene neutralizing deodorant having a neutralizing deodorization effect on, never emit odors.

  Claim 3 of the present invention is the pressure-sensitive adhesive composition according to claim 1 or 2, wherein 100 parts by mass (solid content) of a natural rubber-based aqueous emulsion type adhesive base is contained in the terpene system. 0.001-0.1 part by mass of a Japanese deodorant is blended, and it will surely eliminate odor even when the adhesive layer made of a pressure-sensitive adhesive composition is heated. And the adhesive strength is not further impaired.

  A fourth aspect of the present invention is a sheet comprising the adhesive layer of the pressure-sensitive adhesive composition according to any one of the first to third aspects at a predetermined portion of the overlapping surface of the base sheet. Is a simple and inexpensive sheet, and does not emit odor even when the adhesive layer made of the pressure-sensitive adhesive composition is heated, for personal information or for supporting information such as print information and print information Sheets, that is, folding sheets that have a facing surface that can be temporarily bonded but can be easily peeled off as needed, superposed sheets such as information concealment sheets, information postcards, notice cards, cards, etc. Can be used.

Hereinafter, embodiments of the present invention will be described in detail.
The pressure-sensitive adhesive composition of the present invention does not adhere in a normal state, forms an adhesive layer that can be adhered by pressurization and can be peeled off when necessary. An aqueous emulsion type adhesive base is used, and an effective amount of a terpene-based neutralizing deodorant having a neutralizing and deodorizing action selectively with respect to odor is blended with the adhesive base.

The natural rubber-based aqueous emulsion type adhesive base used in the present invention can be arbitrarily selected from, for example, those conventionally conventionally used as bases for natural rubber-based pressure-sensitive adhesives. Examples of such a latex include natural rubber-based latex, modified rubber such as acid latex, depolymerized latex, vulcanized latex, or grafted natural rubber latex, and these natural rubber latexes. Examples thereof include styrene-rich SBR latex, polystyrene emulsion, and a mixture containing one or more styrene / acrylic copolymer emulsions in an appropriate amount.
Among natural rubber latexes, natural rubber latex obtained by graft copolymerization of methyl methacrylate with natural rubber, especially styrene and methyl methacrylate, especially in terms of blocking resistance, heat resistance, and abrasion resistance. Natural rubber latex obtained by graft copolymerization of

  The natural rubber latex preferably used in the pressure-sensitive adhesive composition of the present invention, for example, obtained by graft copolymerization of methyl methacrylate with natural rubber is, for example, 10 to 40 masses of methyl methacrylate with respect to 100 parts by mass of natural rubber. About one part graft copolymerized.

  The terpene-based neutralized deodorant having a neutralizing and deodorizing action selectively with respect to the odor used in the present invention is the cause of the odor generated when the adhesive layer comprising the pressure-sensitive adhesive composition of the present invention is heated. Even if an acidic substance such as (meth) acrylic acid, methyl (meth) acrylic acid, or acetic acid is generated, or a basic substance such as ammonia is generated, it is selective against these odors. It has neutralizing deodorizing action by ionic bond, coordination and the like. For example, porous fine powders such as activated carbon powder and zeolite powder adsorb and absorb water vapor, water, etc., and therefore do not act selectively on substances that cause odor. Porous fine powders such as activated carbon powder and zeolite powder that do not act selectively on substances causing odor do not show a significant effect and are not effective in the present invention.

Specific examples of the terpene-based neutralizing deodorant having a neutralizing deodorizing action against odors include monoterpene hydrocarbons such as myrcene, karen, oximen, pinene, limonene, camphene, terpinolene, tricyclene, terpinene, phen Chen, Ferrandren, Sylvestrene, Sabinen, etc.
Examples of sesquiterpene hydrocarbons include bisabolene, santalen, gingive belen, caryophyllene, curcumene, cedrene, kazinene, longifolene, sesquibenien, etc.
Examples of diterpene hydrocarbons include camphorene, phyllocladene, podocarprene, totalene, and mylene.
Examples of terpene monoalcohols include citronellol, pinocampheol, geraniol, fentil alcohol, nerol, borneol, linalool, carveol, menthol, twin alcohol, terpineol, etc.
Examples of terpene-based sesquialcohols include farnesol, patchouli alcohol, nerolidol, carotol, bancasole, lanseol, eudesmol, cedrol, guayol, quessoglycol, etc.
Examples of terpene dialcohols include phytol, totarol, sclareol, hinokiol, manol, ferguinol, etc.
Specific examples of aldehydes, ketones, and other terpene neutralizing deodorants include monoterpene compounds such as citronellal, menthone, iron, citral, carbomenton, yonon, cyclocitral, carbotanaceton, cineol, safranal, piperitenone, pinol, ferran Doral, Thyon, Ascaridol, Perillaldehyde, Caron, Citronellic acid, Dageton, camphor, etc. can be mentioned, and sesquiterpene compounds can include cyperone, hinokic acid, elemorphylone, santalic acid, zerumbone, etc., diterpene As compounds, sugiol, pimaric acid, agatendicarboxylic acid, ketomanoyl oxide, neoabietic acid, iso-d-pimalic acid, manoyl oxide, levopimaric acid, rubenic acid, abietin And the like.

Two or more of these can be used in combination.
In the present invention, it is also possible to use a commercially available terpene-based neutralizing deodorant. Specific examples of commercially available terpene neutralizing deodorizers include Ameniclin M500 manufactured by Daiichi Kulin Chemical Co., Ltd.

In the present invention, the terpene-based neutralizing deodorant may be a natural one, a synthetic product, or a mixture thereof. Naturally derived terpene-based neutralized deodorizers such as plant-based can be preferably used in the present invention.
In the present invention, naturally derived fragrances and synthetic fragrances can be added as long as the effects of the terpene neutralizing deodorant are not impaired.
The terpene-based neutralized deodorant used in the present invention can be used as it is, but it can also be used after being dispersed or emulsified in water with a surfactant or the like.

  Natural rubber-based aqueous emulsion type adhesive base such as acidic latex, vulcanized latex, natural rubber latex grafted with methyl methacrylate, natural rubber latex obtained by graft copolymerization of styrene and methyl methacrylate, etc. When using a mixture of rubber latex with styrene-rich SBR latex, polystyrene emulsion, styrene / acrylic copolymer emulsion, etc., the adhesive layer made of the pressure-sensitive adhesive composition of the present invention applies ink in the printing process. When printing is performed using a non-impact printer that is irradiated with ultraviolet rays to dry or to fix the toner by heating, acidic substances such as (meth) acrylic acid, methyl (meth) acrylic acid, and acetic acid are generated. Has a neutralizing and deodorizing action on acidic substances. Since the pen-based neutralizing deodorant is effective amount, odor is not generated is neutralized deodorized.

  The blending amount of the terpene-based neutralization deodorant is preferably 0.001 to 0.1 parts by mass with respect to 100 parts by mass (solid content) of the natural rubber-based aqueous emulsion type adhesive base. It is particularly preferable to add ~ 0.08 parts by mass. If the terpene-based neutralized deodorant is less than 0.001 part by mass, the deodorizing effect may not be obtained, and if it exceeds 0.1 part by mass, the deodorizing effect is high, but the printability may be impaired.

  Examples of the fine particulate filler blended in the pressure sensitive adhesive composition of the present invention include various starch-based, fine spherical acrylic resin, fine spherical methacrylic resin, fine spherical polyethylene, silica, spherical alumina, glass powder, and shirasu balloon. Natural zeolite, synthetic zeolite, calcium carbonate, activated clay and the like. These fine particle fillers may be used alone or in combination of two or more. A fine particle filler having an average particle diameter of 1 to 20 μm can be preferably used in the present invention.

  The natural rubber-based aqueous emulsion type adhesive base used in the pressure-sensitive adhesive light composition of the present invention includes additives commonly used in pressure-sensitive adhesives, such as tackifiers, viscosity modifiers, and aging, as desired. Inhibitors, stabilizers, colorants and the like can be added.

  The pressure-sensitive adhesive composition of the present invention is applied to a predetermined portion of the substrate sheet surface by an application means such as a gravure coater, flexo, air knife coater, bar coater, etc., and is folded in two, folded in three, stacked or separated. It can be suitably used for postcards having various facing surfaces, various forms, notices, various cards, etc., which are temporarily bonded in various forms of superposition, such as superposition, but can be easily peeled off as necessary.

Next, as the base sheet to which the pressure-sensitive adhesive composition of the present invention is applied, synthetic paper or synthetic films such as polyethylene, polyethylene terephthalate, polypropylene, and vinyl chloride can be used in addition to ordinary paper. . When these synthetic films are used, the surface of the base sheet is preferably subjected to surface treatment such as mat treatment or corona treatment. The coating amount of the pressure-sensitive adhesive composition of the present invention to the substrate sheet surface, the adhesion of the adhesive layer, for the maintenance of such peelable, 1 to 30 g / m ^2, preferably from 3 to 20 g / m ² More preferably, the content is 5 to 15 g / m ² .
Furthermore, blocking resistance can be further improved by pressing the formed peelable adhesive layer with a pressure roller at about 1 to 10 kg / cm ² .

  Next, the structure of the sheet of the present invention will be described in detail with reference to the accompanying drawings. Here, FIG. 1 is a developed front view of a tri-fold postcard of the present invention, FIG. 2 is a developed rear view of the postcard, FIG. 3 is a cross-sectional view taken along the line XX of FIG. FIG. 5 is a developed front view of the folded bi-fold postcard of the present invention, FIG. 6 is a developed rear view of the postcard, FIG. 7 is an explanatory diagram of the state of folding the postcard of FIG. 5, and FIG. FIG. 9 is a developed front view of a partially folded postcard, FIG. 9 is a developed rear view of the postcard, and FIG. 10 is an explanatory diagram of a state when the postcard of FIG. 8 is folded.

  First, the tri-fold postcard 1 shown in FIGS. 1 to 3 is composed of a base sheet 2 having a size three times the standard postcard size, and is divided into three regions by folding lines 3a and 3b. On the front surface of the left partition area A, destination information printing 4 such as a zip code, address, and address is printed on the entire surface of the partition areas B and C of the base sheet 2 and the entire back surface of the partition areas A and B. The pressure-sensitive adhesive composition of the invention is applied to form a peelable adhesive layer 6. The concealment information print 5 is printed on the back surface of the left partition area A, the front and back surfaces of the center partition area B, and the adhesive layer 6 on the front surface of the right partition area C. As shown in FIG. 4, the tri-fold postcard 1 configured in this way is formed by folding the overlapping surface of each section into a Z shape at the fold lines 3a and 3b to bring the adhesive layers into contact with each other. By applying pressure with a sealer, the adhesive layer 6 is activated and bonded.

  Next, the bi-fold postcard 11 shown in FIGS. 5 and 6 is composed of a base sheet 2 having a size twice as large as the standard postcard size, and is divided into two regions D and E by a fold line 3 at the center. Is. On the surface of the left partition area D, the destination information printing 4 such as a zip code, address, address, etc. is applied to the entire back surface of the partition areas D and E of the base sheet 2 with the pressure-sensitive adhesive composition of the present invention. An adhesive layer 6 that can be applied and peeled is formed. A concealment information print 5 is printed on the adhesive layer 6 on the back of the partition regions D and E. As shown in FIG. 7, the bi-fold postcard 11 configured in this way is folded and pressed at the fold line 3 so that the adhesive layers on the back surfaces of the left and right compartments are in contact with each other as in the case of the above-described tri-fold postcard. The adhesive layer 6 is activated and bonded.

  Further, the partially folded postcard 21 shown in FIGS. 8 and 9 is composed of a base sheet 2 having a size 1.5 times the standard postcard size, and is divided into two left and right regions F and G having different sizes depending on the folding line 3. It is to be partitioned. On the front surface of the left partition area F, destination information printing 4 such as a postal code, address, and address is overlaid when the entire back surface of the partition area G of the base sheet 2 and the partition area G are folded at the fold line 3. A pressure-sensitive adhesive composition of the present invention is applied to a partial rear surface of the partition region F to be peeled to form a peelable adhesive layer 6. A concealment information print 5 is printed on the adhesive layer 6 on the back surface of the partition area F that is overlapped when the back surface of the right partition area G and the partition area G are folded at the folding line 3. As shown in FIG. 10, the partially folded postcard 21 configured in this manner is folded and pressed at the folding line 3 so that the adhesive layers on the back surfaces of the left and right compartments are in contact with each other, as in the case of the above-described folded bicard. Thus, the adhesive layer 6 is activated and bonded.

  In the above embodiment, an example in which the concealment information print 5 is printed on the adhesive layer 6 is shown. However, the concealment information print 5 can also be printed directly on the corresponding portion of the base sheet 2, and the recipient can The concealment information 5 formed under the adhesive layer 6 can be read by peeling the overlapping surface again. However, it is preferable to print the concealment information print 5 on the adhesive layer 6 from the viewpoint of ease of reading.

  Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

Silica fine particles (trade name) with respect to 120 parts by mass (solid content 58.8 parts by mass) of acrylic / styrene copolymer natural rubber aqueous emulsion type adhesive base (trade name: TMX-1 (manufactured by Regex Corp.)) : Nipsil E200 (manufactured by Nippon Silica Kogyo Co., Ltd.) was previously stirred and mixed with 110.3 parts by mass (silica solid content 17.6 parts by mass) of a dispersion in which the solid content was 16% by mass in ion exchange water. Commercially available starch (trade name: ACTISIZE CWH (manufactured by Rocket)) having an average particle size of 20 μm was dispersed in this mixed liquid in advance in ion exchange water at a solid content of 50% by mass, 47.1 parts by mass (starch solid). 23.5 parts by mass), and neil gum was dissolved in distilled water at 28.8% by mass, and the solution was stirred and mixed with 30.6 parts by mass (solid content: 8.8 parts by mass).
A total amount of terpene neutralizing deodorant (trade name: Ameniclin M500 (manufactured by Daiichi Kulin Chemical Co., Ltd.), terpene compound 1.5% by mass, water 95% by mass, remaining surfactant) was added to this mixed solution. Mix and mix thoroughly to 0.5% by mass (0.039 parts by mass of terpene compound based on 100 parts by mass of acrylic / styrene copolymer natural rubber aqueous emulsion type adhesive base solid content) did. Next, an appropriate amount of a viscosity modifier (trade name: SN thickener-926 (manufactured by San Nopco)) is added so that the viscosity of the mixed solution becomes 300 ± 100 mPa · s (25 ° C.), and stirring is performed so as not to foam. The odor reducing pressure sensitive adhesive composition of the present invention was obtained.

The pressure-sensitive adhesive composition of the present invention is 6 g / m ² (solid content) using a wire bar on high-quality paper (trade name: NIP-70, high-quality 70 kg continuous paper (manufactured by Nippon Paper Industries Co., Ltd.)). After being coated as described above, it was dried to obtain a sheet sample of the present invention in which an adhesive layer was formed on the entire surface.
The following test methods were used to evaluate the odor caused by ultraviolet irradiation, the odor caused by heat, and the adhesive strength. Table 1 shows the results.

(Test method):
(1) (Odor due to ultraviolet irradiation)
Using a UV device [(Igraphic Co., Ltd.), ozone-less high-pressure mercury lamp 80 W / cm], the adhesive layer surface of the sheet sample is irradiated with ultraviolet rays, and the panel member judges odor by sensory evaluation using human olfaction. And evaluated according to the following criteria.
-2: Uncomfortable -1: Slightly uncomfortable 0: Not uncomfortable or pleasant +1: Slightly comfortable +2: Comfortable

(2) (Heat odor)
The sheet sample is heated (approximately 120 to 140 ° C.) by applying it to a laminator [trade name: LPD3212 Meister 6 (manufactured by Fujipra Co., Ltd.), odor is judged by sensory evaluation using human olfaction by panel members, and evaluated according to the above criteria did.

(3) (Adhesive strength)
A sample was prepared by cutting to a width of 100 mm and a length of 270 mm, and the two samples were folded into two, and a 7 MPa load was applied thereto for pressure bonding, and the peel adhesion between the adhesive layers was determined according to the test method JISK6854. The adhesive strength (gf / 25 mm) was measured by 90 ° T-type peeling using an autograph AGS50 (manufactured by Shimadzu Corporation).

  0.3% by mass of the total amount of terpene-based neutralized deodorant used in Example 1 (0.024% of terpene compound based on 100 parts by mass of acrylic / styrene copolymer natural rubber aqueous emulsion type adhesive base solid content) A sheet of the present invention was made in the same manner as in Example 1 except that the content was changed to (part by mass). And it evaluated similarly to Example 1, and a result is shown in Table 1.

  0.1% by mass of the total amount of terpene-based neutralized deodorant used in Example 1 (0.009 terpene compound based on 100 parts by mass of acrylic / styrene copolymer natural rubber aqueous emulsion type adhesive base solid content) A sheet of the present invention was made in the same manner as in Example 1 except that the content was changed to (part by mass). And it evaluated similarly to Example 1, and a result is shown in Table 1.

(Comparative Example 1)
A comparative sheet was prepared in the same manner as in Example 1 except that the terpene-based neutralized deodorant used in Example 1 was not used. And it evaluated similarly to Example 1, and a result is shown in Table 1.

From Table 1, it can be seen that the sheets of the present invention of Examples 1 to 3 have good odor evaluation by ultraviolet irradiation and odor evaluation by heat, and also have good adhesion.
On the other hand, the sheet of Comparative Example 1 has good adhesive strength, but the odor evaluation by ultraviolet irradiation and the odor evaluation by heat are poor.

The pressure-sensitive adhesive composition of the present invention contains an effective amount of a terpene neutralizing deodorant having a neutralizing and deodorizing action selectively with respect to odors with respect to a natural rubber aqueous emulsion type adhesive base. When printing using a non-impact printer that heats and fixes the toner in order to dry the ink in the printing process, the odor will be generated even if the adhesive layer made of the pressure-sensitive adhesive composition is heated. It is possible to form a peelable adhesive layer on the superposed surface of the base sheet easily and at a low cost without impairing the adhesive force. Also, by using a natural rubber-based aqueous emulsion type adhesive base instead of a solvent system that uses an organic solvent as an adhesive base, the volatility of the paint is low, and the coating amount can be easily adjusted to the base sheet surface. In addition to being excellent in coating applicability, since the solvent is water, it is harmless to the human body, is not flammable, and does not require exposure equipment or the like in the coating process or drying process.
The sheet of the present invention having the adhesive layer of the pressure-sensitive adhesive composition of the present invention is a simple and inexpensive sheet, and even if the adhesive layer made of the pressure-sensitive adhesive composition is heated. A sheet for carrying personal information or information for printing information, printing information, etc. without causing odor, that is, a folding sheet that has a spread surface that is temporarily bonded but can be easily peeled off as needed Since it can be used for superimposing sheets, for example, postcards with confidentiality such as information concealment sheets, notices, cards, etc., the industrial utility value is high.

The surface expansion | deployment figure of the trifold postcard of this invention. The back surface expanded view of the postcard of FIG. XX sectional drawing of FIG. The state explanatory view at the time of folding the postcard of FIG. The surface expansion | deployment figure of the bifold postcard of this invention. FIG. 6 is a rear development view of the postcard of FIG. 5. The state explanatory view at the time of folding the postcard of FIG. The surface expanded view of the partial bifold postcard of this invention. The back surface expanded view of the postcard of FIG. The state explanatory view at the time of folding the postcard of FIG.

Explanation of symbols

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

Claims (4)

It is applied to the overlapping surfaces of the sheets, and an adhesive layer that does not adhere in a normal state is formed by a drying process. The overlapping surfaces can be brought into contact with each other and given a predetermined pressure so that the overlapping surfaces can be separated. A pressure sensitive adhesive composition to be bonded,
An odor-reducing pressure-sensitive adhesive composition comprising an effective amount of a terpene-based neutralized deodorant having a neutralizing and deodorizing action selectively with respect to odors to a natural rubber-based aqueous emulsion type adhesive base Stuff. The natural rubber aqueous emulsion is a modified natural rubber aqueous emulsion, a natural rubber latex obtained by graft copolymerization with methyl methacrylate, an acrylic resin such as a natural rubber latex obtained by graft copolymerization of styrene and methyl methacrylate with natural rubber. Copolymer-based natural rubber-based aqueous emulsions, and at least one selected from these natural rubber latexes and one or more of styrene-rich SBR latex, polystyrene emulsion, and styrene / acryl copolymer emulsion. The pressure-sensitive adhesive composition according to claim 1, wherein The said terpene type neutralization deodorant 0.001-0.1 mass part was mix | blended with respect to 100 mass parts (solid content) of natural rubber-type water-based emulsion type adhesive base, The claim 1 or Claim characterized by the above-mentioned. Item 3. The pressure-sensitive adhesive composition according to Item 2. The sheet | seat which has the contact bonding layer of the pressure sensitive adhesive composition in any one of Claims 1-3 in the predetermined part of the overlapping surface of a base sheet.

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