JPH0872395A - Adhesive recording sheet, double-sided adhesive recording sheet and pressure-sticking recording sheet - Google Patents

Abstract

PURPOSE: To provide a pressure sticking adhesive and re-releasable recording sheet, and a pressure-sticking recording sheet. CONSTITUTION: An adhesive recording sheet 6 is composed of a self-coloring heat- sensitive recording layer 2 formed by using a coloring agent and a developer, at least one of which is capsulated and laminating them or mixing them together to form a simple layer, a polyolefin resin layer 4 and a pressure-sensitive adhesive layer 5 to be stuck releasably by fixing respective coated faces of the bonding agent each other without representing adhesive properties and bonding properties in the ordinary state and pressurizing, which are laminated successively on one surface of an opaque substrate 1. A double-sided adhesive recording sheet with a pressure-sensitive strong adhesive layer is formed on the uncoated layer surface side of the recording sheet, and a pressure-sticking recording sheet is formed by using the recording sheets. Print recording can be performed by pressing from above the pressure-sensitive layer of the re-releasable adhesive recording sheet by the arrangement, and the external information is sealed and integrated releasably, which can be used as a releasable postcard by laminating the pressure-sensitive adhesive layers and fixing them by pressure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure-sensitive recording sheet, in which it can be easily printed with a letterpress printing machine, crusher printing, impact printer, etc. and can be pasted with a room temperature pressure-sealing sealer. The pressure-sensitive adhesive layer thus obtained relates to a re-peelable pressure-sensitive adhesive recording sheet which allows the information hidden inside to be seen by peeling the interface. Also, regarding a double-sided adhesive recording sheet in which a pressure-sensitive adhesive layer is provided on the non-coated surface of the adhesive recording sheet, the pressure-sensitive adhesive layer that has been pressure-bonded cannot be peeled once it is adhered Is to have. These recording sheets can be used for outputting and transmitting private information such as confidential postcards, pay slips and health checkups. Since the printed information is protected by the polyolefin resin layer, it can be pressure-bonded. However, the printed contents will not be transferred to the other side.

[0002]

2. Description of the Related Art A recording medium provided with information on an opaque support is folded in two or three by printing or other recording means, or two sheets are superposed, and adhered by peelable adhesive to make apparently one sheet. A postcard, a concealed postcard, or a pressure-bonded postcard, in which the recipient can peel off the peelable adhesive part and read the information provided inside, is more than the general postcard. It has started to be widely used in the world due to the merit of being able to mail information, and being able to mail confidential information such as the amount of money and personal identification number that should not be known to outsiders as a postcard while being hidden from the outside.

The merit of the peelable postcard is not only that a large amount of information and confidential information can be sent at the postage price of the postcard, but also the address, name, etc. on one side of a sheet of paper as seen in a tri-fold postcard. Information on the cover, information hidden on the back side of the writing surface when folded, information hidden on the back side of the writing surface when folded as well, and after printing three types of information at the same time, fold in a Z shape By folding the information on the front side on the surface and the information to be hidden on the inner side, it is possible to print the information on only one side.
There is also the merit of reducing the number of steps, which can produce the same effect as printing the surface.

In such a peelable postcard, the most important re-peelable adhesive (hereinafter referred to as "peelable adhesive")
Is mainly due to the following method. That is,
(1) A method in which two transparent sheets are releasably adhered to each other, strong and viscous / adhesive layers are provided on both sides thereof, and a recorded support is bonded to both sides to be integrated, (2) one transparent sheet A method in which adhesive layers having different adhesive strengths are provided on both sides and the recorded supports are bonded to both sides to be integrated, (3) a peelable adhesive layer is provided on at least one surface of the support, and recording is performed on the layer. After that, a method in which the peelable adhesive layers are overlapped with each other and then pressure-bonded to integrate them is used.

Among these methods, the support recorded by the methods (1) and (2) and the transparent sheet must be superposed and integrated, whereas the method (3) is as if foam paper. It can be handled like ordinary paper, and since it can be folded and pressure-bonded with the adhesive layer that can be peeled off after printing / recording, it is not only a simple process but also has the advantage of reducing the number of processes, making it an excellent processing cost and processing method. It is what However, in the case where a support having a peelable adhesive layer as in (3) (hereinafter referred to as a pressure-sensitive adhesive sheet) is used and the adhesive layers are pressure-bonded to each other, the recording surface is on the adhesive layer. However, when this is once pressed and peeled off, there is a drawback that a part of the recording on the adhesive layer is transferred to the adhesive layer on the facing side to cause so-called ink transfer. This ink transfer is a fatal defect for information recording, in that not only the recording itself becomes thin or lacking, but also the recording moves to the face-to-face and stains the face-to-face recording. Due to this drawback, the method of recording (printing) on the adhesive layer has been limited to a method capable of fixing the ink by heating, such as a laser printer or an electrophotographic method.

However, the resin that constitutes the peelable adhesive layer suffers from a great deal of deterioration due to heat and dryness, and there is a dilemma that the adhesive quality is degraded by heating and fixing the recording portion.

The present invention solves such a problem by using a self-coloring type pressure-sensitive recording system. The self-coloring pressure-sensitive recording layer used in the present invention is developed from so-called carbonless copying paper, and is also called a self-coloring pressure-sensitive recording sheet or self-contined paper as a product form. The constitution is a process of providing a support with microcapsules containing a colorless dye (hereinafter, referred to as a color former), and further, an electron-accepting substance such as acidic clay, a phenol resin, an organic acidic substance or the like on the coating layer. A method of manufacturing by a two-layer coating (including the one in which the coating order is reversed) consisting of two steps for convenience of providing a color developer) and at least one of the above-mentioned two components are microencapsulated and uniformly formed. There is known a manufacturing method (Japanese Patent Publication No. 47-16096) in which the above-mentioned components are mixed with each other and applied one layer.

Naturally, the pressure-sensitive information recorded on the self-coloring type pressure-sensitive recording sheet itself is inevitably exposed to the public, and if it is desired to hide the information content, put it in a separate bag. However, it cannot be used as it is for a recording sheet for the purpose of concealing the present invention.

Further, a polyolefin resin coating layer is provided on the recording layer of the self-coloring type pressure-sensitive recording sheet, and an opaque coating sheet (address display sheet) coated with a heat-sealable adhesive on the back surface is superposed thereon. Method of integrating by thermocompression bonding (Japanese Utility Model Laid-Open No. 2-2173, 3-11)
6974), but it is inconvenient due to the large number of steps such as the information to be hidden and the information such as the address and the like to be written separately.

[0010]

SUMMARY OF THE INVENTION Therefore, the problem to be solved by the present invention is not only that printing and recording can be easily performed, but also that the recording and recording information can be concealed and peeled by easily peelable adhesion. Another object of the present invention is to provide a re-peelable adhesive recording sheet that does not cause ink transfer in a print recording portion even if the adhesive layer is peeled off. This releasable adhesive recording sheet becomes a pressure-bonded recording sheet by pressure-bonding it after printing and recording, and is specifically used as a releasable postcard.

[0011]

The present inventors have found the following method as a result of earnest research for solving the above-mentioned problems. That is, at least one of a color-developing agent and a color-developing agent is microencapsulated on one surface of an opaque support, and they are individually laminated or mixed to form a single layer of a self-coloring pressure-sensitive recording layer, a polyolefin resin layer, a normal state. In the invention of an adhesive recording sheet, which is characterized by sequentially providing a pressure-sensitive adhesive layer that can be peelably adhered by applying pressure to each other by applying pressure to each other without applying adhesiveness and tackiness. The invention of a double-sided adhesive recording sheet, the adhesive recording sheet or the double-sided adhesive recording sheet, wherein a pressure-sensitive and strong adhesive layer capable of irremovably adhering is provided on the opposite surface of the opaque support of the adhesive sheet. Invention of a pressure-bonded recording sheet formed by folding or folding two pressure-sensitive adhesive layers of the adhesive recording sheet or the double-sided adhesive recording sheet so as to face each other and pressure-bonded, and the double-sided adhesive The recording sheet, the inventor of the trifold crimping recording sheet formed by integral folding crimped in a Z-shape.

The present invention will be described in detail below. In the present invention, a self-coloring pressure-sensitive recording layer is provided on an opaque support, a polyolefin resin layer is provided thereon, and a recording sheet provided with a peelable pressure-sensitive adhesive layer is referred to as an adhesive recording sheet,
A double-sided adhesive recording sheet, a double-sided adhesive recording sheet, or a pressure-sensitive adhesive layer of the double-sided adhesive recording sheet, which is provided with a pressure-sensitive strong adhesive layer on the back surface of the adhesive recording sheet that is pressure-bonding but not removable A sheet in which the sheets are placed facing each other and then pressure-bonded to each other, or a sheet obtained by folding the double-sided adhesive recording sheet into a Z shape and pressure-bonding to each other is referred to as a pressure-bonding recording sheet. It is not limited and can be used for other purposes such as slips, lottery, sticky notes, memos, private records such as health checkups and savings management, and labels.

As the support used for the adhesive recording sheet of the present invention, general paper such as high-quality paper, art paper, coated paper, cast paper, glassine paper and the like can be used.
Raw materials usually used in papermaking, such as wood pulp, synthetic pulp, filler, sizing agent, paper-strengthening agent, and dye, can be used as necessary. Also, polyethylene,
Plastic sheets made of polypropylene, polyethylene terephthalate, polyamide, polyvinyl chloride, polyvinylidene chloride, polymethylpentene, etc., and synthetic papers and nonwoven fabrics made of these synthetic fibers, or these synthetic resins laminated on one or both sides of the paper. It is also possible to use laminated paper, metal foil, or a metal foil-paper bonded product, vapor-deposited paper, a hologram-treated opaque sheet, a synthetic resin film bonded product, mica paper, or glass paper. These supports can be made opaque with inorganic or organic dyes, pigments, inks, toners and the like. Of course, it is also possible to make it opaque by tint block printing or solid printing.

To obtain the adhesive recording sheet of the present invention, a single layer of self-coloring is prepared by laminating or mixing a color former or a color developer, at least one of which is microencapsulated, on one side of a support. A pressure-sensitive adhesive recording layer, a step of forming a polyolefin resin layer on the self-coloring pressure-sensitive recording layer, and a step of applying a pressure-sensitive adhesive on the polyolefin resin layer and drying to form a pressure-sensitive adhesive layer. You can After recording on the paper for the adhesive recording sheet thus obtained by an impact printer, it is folded with the pressure-sensitive adhesive layer inside, and pressure-bonded to form a pressure-bonded recording sheet, which can be re-peeled. It can be a crimp postcard.

In the adhesive recording sheet of the present invention, there is no problem in forming a cut portion or a compression line at a portion corresponding to a fold to facilitate folding. Further, the obtained adhesive recording sheet can be formed by folding one sheet and integrating it, or by stacking two sheets and integrating them. Double-sided adhesive with a pressure-sensitive adhesive layer on the back side (in the case of distinguishing it from the pressure-sensitive adhesive layer on the front side, it is called a pressure-sensitive adhesive layer because it is stronger than the adhesiveness obtained by the pressure-sensitive adhesive on the surface) Similarly, in the sex recording sheet, it is possible to fold one sheet into two or three and integrate them, or to superimpose two or more sheets and integrate them. The pressure-sensitive adhesive recording sheet may be pressure-bonded with a pressure such that the self-coloring pressure-sensitive recording layer does not develop color and with a pressure sufficient to bond the pressure-sensitive adhesives that have been stacked, or by using a heat roll. It is possible to improve the tackiness of the pressure-sensitive adhesive and perform pressure bonding.

The self-coloring pressure-sensitive recording layer that can be used in the present invention is not particularly limited, and any conventionally known one can be used. For example, a method of microencapsulation, a wall material of the microcapsule, a color former, an oil dissolving the color former, a color developer, an adhesive resin, a microcapsule protective agent, or the like.

The microencapsulation method includes a coacervation method (US Pat. No. 2,800,458 and the like), an interfacial polymerization method (JP-B-47-1763 and the like), and an in-situ polymerization method (JP-A-51-9079). Gazette etc.) can be used.

Polyurethane, polyurea, epoxy resin, urea / formalin resin, melamine / formalin resin and the like can be used as the wall material of the microcapsule.

As the color former, triallylmethane compounds, diarylmethane compounds, xanthene compounds,
A thiazine-based compound, a spiropyran-based compound, or the like can be used, and is not particularly limited as long as it is generally used for a pressure-sensitive recording material or a heat-sensitive recording material. For example, as the color former, triallylmethane compounds, diarylmethane compounds, xanthene compounds, thiazine compounds, spiropyran compounds, diphenylmethane dyes, spiro dyes, lactam dyes, fluorane dyes, etc. can be used. There is no particular limitation as long as it is generally used for pressure-sensitive recording materials and heat-sensitive recording materials.

Specifically, 3,3-bis (p-dimethylaminophenyl) -6-dimethylaminophthalide, 3,3
3-bis (p-dimethylaminophenyl) phthalide, 3
-(P-Dimethylaminophenyl) -3- (1,2-dimethylindole-3-yl) phthalide, 3- (p-
Dimethylaminophenyl) -3- (2-methylindo-)
Lu-3-yl) phthalide, 3,3-bis (1,2-dimethylindol-3-yl) -5-dimethylaminophthalide, 3,3-bis (9-ethylcarbazol-3-yl) ) -6-Dimethylaminophthalide, 3,3-bis (2
-Phenylindole-3-yl) -6-dimethylaminophthalide, 3-p-dimethylaminophenyl-3-
Triallylmethane dyes such as (1-methylpyrrol-3-yl) -6-dimethylaminophthalide,

Diphenylmethane dyes such as 4,4'-bis-dimethylaminobenzhydrylbenzyl ether, N-halophenyl, leuco-olamine, N-2,4,5-trichlorophenylleuco-olamine, benzoyl leuco Thiazine dyes such as methylene blue, p-nitrobenzoyl leuco methylene blue, 3-methyl-spiro-dinaphthopyran, 3-ethyl-spiro-dinaphthopyran, 3-phenyl-spiro-dinaphthopyran, 3-benzyl-spiro-dinaphthopyran, Spiro dyes such as 3-methyl-naphtho (6′-methoxybenzo) spiropyran and 3-propyl-spiro-dibenzopyran, rho-damine-B-anilinolactam, rho-damine (p-nitroanilino) lactam, ro- LA such as damine (o-chloroanilino) lactam Tam-based dye,

3-dimethylamino-7-methoxyfluorane, 3-diethylamino-6-methoxyfluorane,
3-diethylamino-7-methoxyfluorane, 3-diethylamino-7-chlorofluorane, 3-diethylamino-6-methyl-7-chlorofluorane, 3-diethylamino-6,7-dimethylfluorane, 3- (N -Ethyl-p-toluidino) -7-methylfluorane, 3-
Diethylamino-7-N-acetyl-N-methylaminofluorane, 3-diethylamino-7-N-methylaminofluorane, 3-dimethylamino-7-dibenzylaminofluorane, 3-diethylamino-7-methyl-N
-Benzylaminofluorane, 3-diethylamino-7
-N-chloroethyl-N-methylaminofluorane, 3
-Diethylamino-7-N-diethylaminofluorane, 3- (N-ethyl-p-toluidino) -6-methyl-7-phenylaminofluorane, 3- (N-ethyl-)
p-toluidino) -6-methyl-7- (p-toluidino) fluorane, 3-diethylamino-6-methyl-7
-Phenylaminofluorane, 3-diethylamino-7
-(2-carbomethoxy-phenylamino) fluorane, 3- (N-ethyl-N-iso-amylamino) -6
-Methyl-7-phenylaminofluorane, 3- (N-
Cyclohexyl-N-methylamino) -6-methyl-7
-Phenylaminofluorane, 3-piperidino-6-methyl-7-phenylaminofluorane, 3-pyrrolidino-6-methyl-7-phenylaminofluorane, 3-diethylamino-6-methyl-7-xylidinofluorane , 3-diethylamino-7- (o-chlorophenylamino) fluorane, 3-dibutylamino-7- (o-chlorophenylamino) fluorane, 3-pyrrolidino-6
Examples thereof include fluoran dyes such as -methyl-7-p-butylphenylaminofluorane.

As the oil for dissolving the color former, aromatic synthetic oils such as diarylalkane series, alkylnaphthalene series, alkylated biphenyls, hydrogenated terphenyls, and aliphatic synthetic oils such as kerosene, naphtha, paraffin oil and chlorinated paraffins are used. Oils, cottonseed oil, soybean oil, vegetable oils such as flaxseed oil and the like can be used.

As the protective agent for the microcapsules, cellulose powder, starch particles, talc, calcined kaolin, calcium carbonate and the like can be used.

Examples of developers include clays (eg, activated clay, acid clay, attapulgite, bentonite, colloidal silica, aluminum silicate), organic acids (eg, aromatic carboxy compounds such as salicylic acid, or metal salts thereof). Etc.), mixtures of organic acids and metal compounds, acidic polymers (for example, phenol / formaldehyde resins, salicylic acid resins or their polyvalent metals such as zinc, magnesium, aluminum, calcium, titanium, manganese, tin and nickel). Can be used.

In the present invention, as the binder used for forming the self-coloring pressure-sensitive recording layer, starches, cellulose derivatives such as hydroxyethyl cellulose, methyl cellulose, ethyl cellulose and carboxymethyl cellulose, proteins such as casein and gelatin, oxidized starch, Ester compound Aqueous natural polymer such as sucrose such as starch, polyvinyl alcohol, modified polyvinyl alcohol, polyvinylpyrrolidone, polyacrylic acid, sodium polyacrylate, acrylic acid amide / acrylic acid ester copolymer, acrylic acid amide / acrylic acid Ester / methacrylic acid terpolymer, alkali salt of styrene / maleic anhydride copolymer,
Water-soluble synthetic polymer compounds such as latex, polyacrylamide, styrene / maleic anhydride copolymer, latexes, water-soluble adhesive resins such as alkali salts of ethylene / maleic anhydride copolymer,

Further, polyvinyl acetate, polyurethane, polyacrylic acid ester, styrene / butadiene copolymer, acrylonitrile / butadiene copolymer, methyl acrylate / butadiene copolymer, acrylonitrile / butadiene / acrylic acid copolymer, ethylene Examples thereof include latexes such as vinyl acetate copolymers. These binders can also be used as a binder component in the polyolefin resin layer.

Pigments used in the self-coloring pressure-sensitive recording layer include diatomaceous earth, talc, kaolin, calcined kaolin, calcium carbonate, magnesium carbonate, titanium oxide,
Examples thereof include zinc oxide, silicon oxide, aluminum hydroxide and urea-formalin resin.

In addition, higher fatty acid metal salts such as zinc stearate and calcium stearate as auxiliary agents,
Waxes such as paraffin, oxidized paraffin, polyethylene, oxidized polyethylene, stearic acid amide, and castor wax, dispersants such as sodium dioctylsulfosuccinate and polyvinyl alcohol modified with sulfonic acid, and ultraviolet absorbers such as benzophenone-based and benzotriazole-based, In addition, surface active agents, fluorescent dyes, antistatic materials, thickeners, preservatives, antioxidants, defoamers, release agents, lubricants, antiblocking agents, tackifiers, etc. It is added to the layer, the aqueous polymer intermediate layer, and the polyolefin resin layer as needed.

In the present invention, as the method for forming the self-coloring pressure-sensitive recording layer, known coating methods such as blade coating method, air knife coating method, gravure coating method, roll coating coating method, bar coating method and drop curtain coating method are used. Methods are available. The self-coloring pressure-sensitive recording layer is preferably smoothed.

Furthermore, a back coat is applied to prevent curling, a conductive treatment is applied to prevent jamming, and an undercoat layer is provided between the support and the self-coloring pressure-sensitive recording layer. Various known techniques in the manufacturing field can be added as necessary.

Further, as a constitution of the present invention, in order to obtain a high color density, between the support and the self-coloring pressure-sensitive recording layer,
Calcium carbonate, talc, silica, clay, barium sulfate, magnesium carbonate, magnesium silicate, lead sulfate,
Lead white, zinc white, zinc sulfide, satin white, titanium oxide, antimony oxide, mica, bentonite, calcium silicate,
Anchor layer containing inorganic pigments such as gypsum and aluminum hydroxide, or fine powder organic pigments such as polystyrene, polyvinyltoluene, styrene / divinylbenzene copolymer, polymethylmethacrylate, urea / formaldehyde polymer, polyethylene, etc. There is no problem in dispersing in the color forming pressure-sensitive recording layer.

Examples of the polyolefin resin of the present invention include the following substances. Low density polyethylene,
Examples include medium density polyethylene, high density polyethylene, polypropylene and polymethylpentene. As a method for providing the polyolefin resin layer, a laminating method by melt extrusion using a general T die and a laminating method by coextrusion may be used. Further, corona treatment, flame treatment, or ozone treatment may be performed on the self-coloring pressure-sensitive recording layer or the polyolefin resin layer to control the adhesiveness.

A pigment may be added to the polyolefin resin layer of the present invention in order to control the peelable adhesive strength. Specifically, clay, calcium carbonate, talc,
Zinc sulfide, satin white, titanium oxide, antimony oxide, colloidal silica, silica, kaolin, mica, bentonite, calcium silicate, barium sulfate, magnesium carbonate, magnesium silicate, lead sulfate, lead white, zinc white, gypsum, hydroxide It may include inorganic pigments such as aluminum or finely divided organic pigments such as polystyrene, polyvinyltoluene, styrene / divinylbenzene copolymers, polymethylmethacrylate, urea / formaldehyde polymers, polyethylene. These pigments can be used in a range that does not unnecessarily reduce the transparency of the polyolefin resin layer.

The lamination amount of the polyolefin resin layer is
Although not limited, it is desired that the thickness is thinner, preferably 5 to 4 for the purpose of avoiding a decrease in writing pressure.
0 g / m ^2, more preferably 8~30g / m ^2. When the laminating amount of the polyolefin resin layer is less than this range, the adhesiveness with the pressure-sensitive recording layer is inferior, and when the laminating amount is more than this range, not only the adhesiveness and pressure-bonding property do not contribute but also the color development is impaired. There is.

The pressure-sensitive adhesive used in the present invention is classified into a pressure-sensitive adhesive that can be peeled and a pressure-sensitive adhesive that cannot be peeled. It is possible from Adhesive base polymers used for these pressure-sensitive adhesives include natural rubber, modified natural rubber, styrene-butadiene rubber, synthetic rubber such as acrylonitrile-butadiene rubber, ethylene-vinyl acetate copolymer resin, acrylic ester resin. , Vinyl chloride resin, vinylidene chloride resin, etc. are used in the form of solution or emulsion, and silica, kaolin, clay, calcium carbonate, aluminum hydroxide, titanium oxide, zinc oxide, melamine resin are used for the purpose of controlling adhesion. Particles, benzoguanamine resin particles, starch particles and the like can be used in combination. Further, the pressure-sensitive adhesive of the present invention includes a rosin-based resin and its derivative as a tackifier, a terpene-based resin, a coumaroindene-based resin, a xylene-based resin, an alkylphenol-based resin, a petroleum resin, etc. for adhesion, blocking resistance, and heat resistance. It can be used in combination as long as it does not impair the sex. Further, a release agent may be used in combination for the purpose of controlling the peelability, and for example, various paraffins, waxes, fatty acids or derivatives thereof, higher alcohols, metal soaps, silicone resins, etc. are not impaired in adhesiveness. It can be used in a range. Furthermore, the pressure-sensitive adhesive used in the present invention includes
If necessary, an antistatic agent, a thickener, a dispersant, an antiseptic agent, an antioxidant, an antiaging agent, an ultraviolet ray inhibitor, an antifoaming agent and the like can be added.

In the pressure-sensitive recording sheet of the present invention, since the self-coloring pressure-sensitive recording layer is integrated with the polyolefin resin layer and the pressure-sensitive adhesive layer provided on the self-coloring pressure-sensitive recording layer inside, Chromogenicity The pressure-sensitive recording layer has a shape protected inside, so there is no worry of color stains, weather resistance of recording,
Not only is it excellent in water resistance, oil resistance, abrasion resistance, etc., but it is also possible to handle pressure-sensitive recorded information without exposing it to the outside and exposing it.

The pressure-sensitive adhesive recording sheet using the adhesive recording sheet of the present invention has complete confidentiality of information, and since the pressure-sensitive adhesive recording sheet once peeled does not re-adhere, it is highly confidential. is there.

In the adhesive recording sheet of the present invention, by providing the polyolefin resin layer, the capsule and the color developer can be mixed and colored without being shielded by the pressure-sensitive adhesive component, and the color is carelessly developed. A high color density can be obtained while preventing stains. By utilizing the peelable adhesiveness of the pressure sensitive adhesive, it is possible to read the internal record by peeling the adhesive recording sheet on two sides.

The peelable pressure-sensitive recording sheet of the present invention is obtained by superposing two layers of the adhesive recording sheet of the present invention so that the pressure-sensitive adhesive layers overlap each other and pressure-bonding them. When the double-sided adhesive recording sheet of the present invention is used, it is possible to superimpose the adhesive recording sheets in three layers and integrate them, as in a tri-fold postcard. Also in the case of producing a peelable postcard using a pressure-sensitive adhesive recording sheet, two adhesive recording sheets are superposed and pressure-bonded, or one removable adhesive recording sheet is bent into a V shape. The method of hiding the entire printed area to be crimped after pressing (postcard), or "
Use any method such as a method of folding in an L "shape to conceal only a part of the printing information, a method of bending one double-sided adhesive recording sheet in a" Z "shape and pressure bonding (3-fold postcard) It doesn't matter.

The adhesive recording sheet of the present invention uses a pressure-sensitive adhesive bonding method capable of peeling even with a small pressure in the integration step of peeling bonding, so that the pressure-sensitive adhesive may be peeled off due to excessive pressure. It is possible to perform peelable adhesion without causing color fog of the self-coloring pressure-sensitive recording layer. Further, since a transparent sheet for adhesion is not used, the work of integration is easy and the position control at the time of crimping is easy, and it is possible to superimpose them without wrinkles.

When recording on the pressure-sensitive recording surface of the adhesive recording sheet of the present invention, it is possible to use an impact printer, and when it is necessary to record a large amount of the same information, letterpress printing is used. It is also possible to record. As a matter of course, recording with a ballpoint pen, iron brush, etc. is also possible. Further, general printing may be performed on the self-coloring pressure-sensitive recording layer, the polyolefin resin layer, the pressure-sensitive adhesive layer, the pressure-sensitive strong adhesive layer, or the back surface of the support. Further, there is no problem in making the opaque by the tint block printing. Further, the adhesive recording sheet, the double-sided adhesive recording sheet and the pressure-sensitive adhesive recording sheet of the present invention have a printing layer, a toner receiving layer, an ink receiving layer, a pressure-sensitive recording layer (color former layer, developer layer) on the front surface and the back surface thereof. , Or a self-coloring pressure-sensitive recording layer), a thermosensitive recording layer, a writing layer, a magnetic recording layer, etc.
Alternatively, they can be provided at the same time. However, for writing, it is necessary to keep the writing pressure to such an extent that the internal self-coloring pressure-sensitive recording layer does not develop color.

The method of printing or recording includes writing with a pencil or ink, impact printer, electrophotography, thermal transfer, ink ribbon, heat sensitive, pressure sensitive, ink jet, flexographic printing, offset printing, gravure printing, letterpress printing, intaglio printing, laser. There is no limitation by the method such as printing and label sticking. However, recording on the self-coloring type pressure-sensitive recording layer after providing the polyolefin resin layer is limited to a recording method involving color formation by pressure.

For printing or printing on the back surface of the adhesive recording sheet, it is preferable to use ink jet printing, laser printing, electrophotographic method, etc. for the purpose of avoiding unnecessary color development of the self-coloring pressure-sensitive recording layer. .

Further, the adhesive recording sheet of the present invention includes other pressure-sensitive recording sheets, back carbon copying sheets, adhesive sheets,
It can be used as a series of copy sheets by combining with a printing sheet, a transparent film and the like. There is no problem in processing a part or all of the pressure-sensitive adhesive recording sheet of the present invention such as die cutting, separating a part of the support, perforation, and printer feed holes.

[0046]

In the adhesive recording sheet of the present invention, the self-coloring pressure-sensitive recording layer can be colored by performing pressure printing, and the polyolefin resin layer provided on the self-coloring pressure-sensitive recording layer. By the action of the pressure-sensitive adhesive, the two recording papers can be integrated with each other by making the recording surface inside by press-bonding to form a pressure-bonded recording sheet, and the recorded portion can be handled as hidden information. In addition, this integration is a peelable adhesive that can be peeled off again with a light force to read the hidden information inside, so for example, in a peelable postcard using a pressure-sensitive recording sheet, only the recipient after mailing. Can confirm the information. Since the self-coloring recording layer exists below the pressure-sensitive adhesive layer and the polyolefin resin layer, which are peelable adhesive layers, unlike a general adhesive sheet in which only the pressure-sensitive adhesive layer is provided on the support. Since printing with toner or ink ribbon is not necessary, there is no ink transfer, and even if the pressure-sensitive adhesive layers are peelably bonded, they can be peeled off without being affected by the transfer of ink to the recorded area. It is possible to read clear records without ink transfer by peeling off the adhesive part.

Further, although the recording material having the self-coloring pressure-sensitive recording layer originally develops color by light pressure and causes so-called color stain, in the removable adhesive recording sheet of the present invention, polyolefin is used. Since the resin layer and the pressure-sensitive adhesive layer function as protective layers for the self-coloring pressure-sensitive recording layer, such color stain can be prevented. The repeelable adhesive recording sheet of the present invention is a single sheet before pressure-sensitive recording or when pressure-bonded after recording, and does not require a step of sandwiching a film or a transparent sheet, and can be used for peelable postcards and the like. It is easy to integrate them into a pressure-bonded recording sheet.

[0048]

The present invention will be described in detail below with reference to examples, but the contents of the present invention are not limited to the examples.
All parts and% shown below are based on weight. Also,
Unless otherwise noted, the value indicating the smear amount is the smear amount after drying. In addition, all the pressure bonding uses a pressure bonding roller (SP401, manufactured by Nippon ADM Co., Ltd.).

Preliminary Operation: [Preparation of Self-Coloring Pressure-Sensitive Recording Sheet] Microcapsules containing a color-forming agent used in the self-coloring pressure-sensitive recording layer were prepared as follows. First, crystal violet lactone 2
0 part was dissolved in 90 parts of Hisol SAS N-296 (manufactured by Nippon Petrochemical Co., Ltd.) by heating to obtain an internal phase oil. Melamine 10
And 25 parts of 37% formalin were heated together with 100 parts of water to obtain a melamine-formalin initial polycondensate. Then, the internal phase oil was emulsified in 150 parts of a 6% styrene / maleic anhydride copolymer aqueous solution, and the above melamine-formalin polycondensate was added to this emulsion to adjust the liquid temperature to 70 ° C.
By holding for a period of time, a microcapsule dispersion liquid containing a color former having a melamine-formalin resin film was obtained. The average particle size of the obtained microcapsules was about 5 μm.

The coating liquid for the self-coloring pressure-sensitive recording layer was prepared by the following formulation. The unit is dry parts by weight. Microcapsules containing color former 150 parts Developer (PR26298 manufactured by Sumitomo Durez Co., Ltd.) 85 parts Starch particles 275 parts Kaolin clay 100 parts Oxidized starch 100 parts Calcium carbonate 120 parts

A recording sheet having a self-coloring pressure-sensitive recording layer was prepared as follows. That is, a self-coloring pressure-sensitive recording sheet was prepared by applying a self-coloring pressure-sensitive recording layer having the above composition onto a finely coated paper having a basis weight of 80 g / m ^{2 so} that the coating amount was 8 g / m ^2. Obtained.

Example 1 On the recording surface of the self-coloring pressure-sensitive recording sheet prepared in the preliminary operation, low density polyethylene was provided as a polyolefin resin layer by melt extrusion so that the laminating amount was 15 g / m ² .

Next, a pressure-sensitive adhesive 1 having the following composition was coated on the polyolefin resin layer so that the coating amount was 8 g / m ² .
It was dried to obtain the desired adhesive recording sheet. [Pressure-sensitive adhesive 1] Acrylic ester emulsion (manufactured by Nippon Synthetic Rubber Co., Ltd., AE-923) Dry weight 60 parts Synthetic silica (Mizukasil P-832 manufactured by Mizusawa Chemical Co., Ltd.) Dry weight 50 parts Starch particles Dry weight 40 200 parts of water

The pressure-sensitive adhesive layer does not exhibit tackiness in a normal state, and even when pressure-sensitive recording is carried out in a state where an adhesive recording sheet is introduced into an impact printer and an ink ribbon is not provided, paper feeding and printing are performed. We were able to perform pressure-sensitive recording without any damage to the head. Two pressure-sensitive adhesive recording sheets on which printing and recording were performed, pressure-sensitive adhesive layers were faced to each other and passed through a pressure roller to be pressure-bonded and integrated to obtain a pressure-bonded recording sheet. The print recording surface was completely hidden, and new recording could be written on the front surface or the back surface of the pressure-sensitive recording sheet by various means such as ink jet, thermal fusion transfer, and magic.

Example 2 The pressure-sensitive adhesive recording sheet obtained in Example 1 on which printing was recorded was folded with the pressure-sensitive adhesive layers facing each other and passed through a pressure roller to be pressure-bonded and integrated to obtain a pressure-bonded recording sheet. It was
The print recording surface was completely hidden, and new recording could be written on the front surface or the back surface of the pressure-sensitive recording sheet by various means such as ink jet, thermal fusion transfer, and magic.

Example 3 On the back surface of the adhesive recording sheet prepared in Example 1,
A pressure-sensitive adhesive 2 having the following composition was applied at 10 g / m ² and dried to form a pressure-sensitive strong adhesive layer, to obtain a target double-sided adhesive recording sheet. Both the pressure-sensitive adhesive layer and the pressure-sensitive strong adhesive layer do not show tackiness in a normal state, and even when pressure-sensitive recording is performed without introducing an ink ribbon by introducing a double-sided adhesive recording sheet into an impact printer, It was possible to perform pressure-sensitive recording without causing any damage to the feed and print head. [Pressure sensitive adhesive 2] Acrylic ester emulsion (AE-923 manufactured by Japan Synthetic Rubber Co., Ltd.) Dry weight 80 parts Synthetic silica (Mizukasil P-832 manufactured by Mizusawa Chemical Co., Ltd.) Dry weight 40 parts Starch particles Dry weight 30 200 parts of water

Two adhesive recording sheets were printed and printed.
The pressure-sensitive adhesive layers were made to face each other and passed through a pressure roller to be pressure-bonded and integrated to obtain a pressure-bonded recording sheet. The print recording surface was completely hidden, and new recording could be written on the front surface or the back surface of the pressure-sensitive recording sheet by various means such as ink jet, thermal fusion transfer, and magic.

Example 4 The double-sided adhesive recording sheet for printing and recording obtained in Example 3 was bent so that the pressure-sensitive adhesive layers face each other, and passed through a pressure roller as it was for pressure-bonding integration, and pressure-bonded recording. Got the sheet. The print recording surface was completely hidden, and new recording could be written on the front surface or the back surface of the pressure-sensitive recording sheet by various means such as ink jet, thermal fusion transfer, and magic.

Example 5 The double-sided adhesive recording sheet for printing and recording obtained in Example 3 was folded into a Z-shape, passed through a pressure roller as it was, and pressure-bonded integrally to form a three-fold pressure-bonded recording sheet. Obtained. The print recording surface of the folded part is completely hidden, part of the print recording that was not hidden is exposed on the surface of the pressure-bonded recording sheet by overlaying, and the back surface is newly exposed by various means such as inkjet, melt heat transfer, and magic. It was possible to write various records.

Comparative Example 1 On the recording surface of a self-coloring pressure-sensitive recording sheet obtained by preliminary operation, low density polyethylene was melt-extruded as a polyolefin resin layer so that the lamination amount was 15 g / m ^2, and the evaluation was performed as it was. Using.

Comparative Example 2 The same pressure-sensitive adhesive 1 as in Example 1 was coated on a slightly coated paper having a basis weight of 80 g / m ^{2 so} that the coating amount was 8 g / m ^2, and dried to obtain adhesiveness. A recording sheet was obtained. The pressure-sensitive adhesive layer does not exhibit tackiness in a normal state, and even if an adhesive recording sheet is introduced into an impact printer and an ink ribbon is attached and printing is performed, there is no obstacle to the paper feed, print head, etc. I was able to print and record without waking up. The obtained two adhesive recording sheets on which printing and recording were performed, pressure-sensitive adhesive layers were faced to each other and passed through a pressure roller to be pressure-bonded and integrated to obtain a pressure-bonded recording sheet. The print recording surface was completely hidden, and new recording could be written on the front surface or the back surface of the pressure-sensitive recording sheet by various means such as ink jet, thermal fusion transfer, and magic.

Comparative Example 3 The pressure-sensitive adhesive recording sheet obtained in Comparative Example 2 was bent with the pressure-sensitive adhesive layers facing each other and passed through a pressure roller to be pressure-bonded to obtain a pressure-bonded recording sheet. It was
The print recording surface was completely hidden, and new recording could be written on the front surface or the back surface of the pressure-sensitive recording sheet by various means such as ink jet, thermal fusion transfer, and magic.

Comparative Example 4 On the back surface of the adhesive recording sheet prepared in Comparative Example 2,
Coating the pressure sensitive adhesive 2 of Example 2 to 10 g / m ² ,
A double-sided adhesive recording sheet was obtained by drying. Pressure sensitive adhesive layer,
Both the pressure-sensitive and strong adhesive layer do not exhibit tackiness in a normal state, and even if an adhesive recording sheet is introduced into an impact printer and an ink ribbon is attached to perform printing recording, there is no obstacle to the paper feed, print head, etc. I was able to print and record without waking up. Two double-sided adhesive recording sheets on which printing and recording were performed, pressure-sensitive adhesive layers were faced to each other and passed through a pressure roller to be pressure-bonded and integrated to obtain a pressure-bonded recording sheet. The print recording surface is completely hidden, the surface of the pressure-sensitive recording sheet,
Alternatively, new recording could be written on the back side by various means such as ink jet, thermal fusion transfer, and magic. The obtained double-sided adhesive recording sheet on which printing and recording was performed was folded so that the pressure-sensitive adhesive layers face each other, and passed through a pressure roller as it was to be pressure-bonded and integrated to obtain a pressure-bonded recording sheet. The print recording surface was completely hidden, and new recording could be written on the front surface or the back surface of the pressure-sensitive recording sheet by various means such as ink jet, thermal fusion transfer, and magic.

Comparative Example 5 The double-sided adhesive recording sheet obtained in Comparative Example 4 on which printing and recording was performed was bent so that the pressure-sensitive adhesive layers face each other, and then passed through a pressure-bonding roller as it is to be pressure-bonded and integrated, and a pressure-bonded recording sheet. Got The print recording surface was completely hidden, and new recording could be written on the front surface or the back surface of the pressure-sensitive recording sheet by various means such as ink jet, thermal fusion transfer, and magic.

Comparative Example 6 The double-sided adhesive recording sheet on which printing and recording was carried out obtained in Comparative Example 4 was folded into a Z-shape and passed through a pressure roller as it was to be pressure-bonded and integrated to obtain a three-fold pressure-bonded recording sheet. It was The print recording surface of the folded portion is completely hidden, part of the print recording that is not hidden on the surface of the pressure-bonded recording sheet is exposed, and the back surface of the new recording recording is made by various means such as inkjet, melt heat transfer, and magic. It was writable.

[Printability] The adhesive recording sheet and the double-sided adhesive recording sheet obtained in Examples and the self-coloring pressure-sensitive recording sheet of Comparative Example 1 are all pressure-sensitive and self-coloring, and thus are further printed. Printing was performed using a dot impact printer that does not require ink and does not have an ink ribbon attached before pressure bonding. The pressure-sensitive recording type adhesive recording sheets and double-sided adhesive recording sheets obtained in Comparative Examples 2 to 6 require ink for printing, and printing is performed by a dot impact printer equipped with an ink ribbon before pressure bonding. went. In any of the samples, the printability was evaluated based on the number of prints that hinder reading when printing 10,000 characters.

[Adhesiveness] The adhesive recording sheet and the double-sided adhesive recording sheet of the example printed and the non-pressure-sensitive type adhesive recording sheet and the double-sided adhesive recording sheet of the comparative example are the same as those of the example and the comparative example. As described in the example, a pressure-sensitive adhesive layer is placed inside and folded in two in a postcard size (10 cm × 15 cm) (in Example 5 and Comparative Example 6 is folded in three) or in two layers, and a pressure-sensitive adhesive roller with variable clearance (Japan Adhesion was performed by passing through SP401) manufactured by ADM. Adjust the pressure on the clearance scale,
A clearance (for this machine, which is folded in two or leveled by stacking two levels 9 and level 11 in the case of three-folding) was used. By this test, a pressure-bonded recording sheet is obtained. Regarding Comparative Example 1, the same color-bonding test was performed by stacking the self-coloring pressure-sensitive recording layers on top of each other, but no pressure-bonding was performed. After pressure bonding, it was cut into a strip shape with a width of 30 mm, and the 180 ° peel strength was measured with a Tensilon universal tensile tester. Without being peeled off carelessly during mailing,
In addition, when peeling is desired, the peeling strength that allows good peeling is 10 to 200 gf / 30 mm, and if it is lower than that, problems such as peeling during mailing tend to occur, and if it is higher than that, peeling occurs. Problems such as tearing of paper are likely to occur. For Example 5 and Comparative Example 6, the peel strength between the adhesive layers having the printed surface and the peel strength between the pressure-sensitive adhesive layers corresponding to the back surface are also shown. The adhesive strength between the pressure-sensitive adhesive layers is required to be sufficiently higher than the peel strength between the adhesive layers, and it is not too high as the range of the adhesive strength. ..

[Peeling Feeling] The crimping recording sheet used in the crimping test was peeled from the end portion by hand to confirm the peeling feeling. The case where the film could be easily and uniformly peeled was judged as excellent in releasability, the film was slightly heavier in peeling, the case where there was resistance to the peeling was evaluated as the releasability, and the case where the film was adhered to the extent that it could not be peeled was judged as the poor releasability. In Example 7 and Comparative Example 8, peeling occurred between the pressure-sensitive adhesive layers.

[Ink Transfer] On the printed surface of the pressure-bonded recording sheet after the peeling feeling test, stains on the printed surface were measured. In the printability test, the ink transfer rate was evaluated by calculating the probability (%) that ink transfer of the printed part on the opposite side occurred on the printed characters and the characters were stained.

Tests were carried out by the above method, and the evaluation results are shown in Table 1.

[0071]

[Table 1]

Evaluation: The adhesive recording sheet, the double-sided adhesive recording sheet and the pressure-sensitive adhesive recording sheet obtained in the examples are excellent in printability, pressure-sensitive adhesiveness and releasability, and the ink in the color-developed portion is transferred to the opposite surface even after peeling. It has no bad effects and has excellent recordability and handleability.

On the other hand, the pressure-sensitive recording sheet of Comparative Example 1 having only the polyolefin resin layer and the self-coloring pressure-sensitive recording layer does not have the pressure-bonding property. The adhesive recording sheets, the double-sided adhesive recording sheets and the pressure-sensitive adhesive recording sheets of Comparative Examples 2 to 6 which do not have the self-coloring pressure-sensitive recording layer are printed on an ink dot printer even when printed with an ink dot printer. After the peeling, the print became very difficult to read because it was transferred.

[0074]

According to the adhesive recording sheet of the present invention,
A pressure-bonded recording sheet can be produced by stacking and pressure-bonding. This pressure bonding is a peelable adhesive, and can be easily peeled off if it is peeled from the end. Therefore, the printed information can be handled without being exposed to the outside and exposed, and the information printed inside can be read by peeling the peelable adhesive portion as necessary. Since the printed information is the color developed by the self-coloring pressure-sensitive recording layer inside the polyolefin resin layer, the printed information does not transfer to the other side even if they are integrated by pressure bonding, and it is possible to reliably and inexpensively. Confidential peelable postcards can be manufactured. In addition to the peelable postcard, the present invention can be used in many applications such as continuous slips, sticky slips, labels, recording, dust-free recording paper, and has great industrial significance.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an adhesive recording sheet of the present invention.

FIG. 2 is a sectional view of a double-sided adhesive recording sheet of the present invention.

FIG. 3 is a sectional view of the pressure-sensitive recording sheet of the invention.

[Explanation of symbols]

 1 Opaque support 2 Self-coloring pressure-sensitive recording layer 3 Self-coloring pressure-sensitive recording sheet 4 Polyolefin resin layer 5 Pressure-sensitive adhesive layer 6 Adhesive recording sheet 7 Pressure-sensitive adhesive layer 8 Double-sided adhesive recording sheet 9 Pressure-sensitive recording sheet 10 Peelable Adhesive part

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B42D 15/04 A

Claims (4)

[Claims] 1. An opaque support on one side of which at least one of a color former and a developer is microencapsulated, and they are laminated or mixed individually to form a single layer of a self-coloring pressure-sensitive recording layer, a polyolefin resin layer, An adhesive recording sheet in which a pressure-sensitive adhesive layer is sequentially provided, which does not exhibit adhesiveness or tackiness in a normal state and can be peelably adhered by applying pressure to each other by applying pressure to each other. 2. The adhesive recording sheet according to claim 1, which has no self-coloring pressure-sensitive recording layer, has one surface on which the adhesive coating surfaces face each other without showing adhesiveness or tackiness in a normal state. Double-sided adhesive recording sheet provided with a pressure-sensitive and strong adhesive layer that can be adhered by applying pressure. 3. The adhesive recording sheet according to claim 1 or the double-sided adhesive recording sheet according to claim 2 is folded or folded, and the pressure-sensitive adhesive layers of the recording sheets are made to face each other and are pressure-bonded to be integrated. A crimped recording sheet. 4. A three-fold pressure-bonded recording sheet obtained by folding the double-sided adhesive recording sheet according to claim 2 into a Z shape and pressure-bonding them together.