JPH06127116A - Pressure sensitive recording sheet - Google Patents

Abstract

PURPOSE:To manufacture a pressure sensitive recording sheet with recorded contents concealed surely. CONSTITUTION:A pressure sensitive recording layer which is coated with microcapsules containing at least a coupler or a developer, respectively laminated alone or mixed, a polyolefine laminated layer, an electron beam curing type resin layer, and an opaque covering sheet are laminated in sequence on one side of a support to make a pressure sensitive recording sheet. In the electron beam curing type resin, 1-50wt.% of a white or colored pigment is incorporated. Information can be recorded in the inside pressure sensitive recording layer by pressing the opaque covering sheet, which can also be used as a label not requiring relased paper.

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 a single-form self-coloring type pressure-sensitive recording layer provided on a support and a developer as necessary are coated. It is a pressure-sensitive recording sheet that has an opaque covering sheet integrated and has peelability, and is a type of recording that has non-exposure of recording, copyability, water resistance, chemical resistance, oil resistance, scratch resistance, and dust generation suppression property. The present invention relates to a pressure-sensitive recording sheet that can be used for recording, labels, slips, communication messages, entertainment products, recording paper for clean rooms, and the like.

[0002]

2. Description of the Related Art The pressure-sensitive recording layer used in the present invention is a self-coloring pressure-sensitive recording type, which is developed from so-called carbonless copying paper. Also called paper.
The constitution is a step of applying a coating liquid of microcapsules containing a colorless dye (hereinafter referred to as a color former) to a support,
Further, a manufacturing method by two-layer coating consisting of two steps, that is, a step of coating an electron-accepting substance (hereinafter referred to as a developer) such as acid clay, a phenol resin, an organic acidic substance on the coating (coating) (Including those in which the processing order is reversed), the above-mentioned two components, or any one of the components is microencapsulated and uniformly mixed to obtain a coating method (Japanese Patent Publication No. 47-1).
No. 6096) is known. In such a self-coloring pressure-sensitive recording sheet, a color developing agent and a color developing agent are present in the vicinity, so a printed image with a high color density is easily obtained, but unintentional unintentional due to friction during manufacturing or handling. There is a problem that colored stains are likely to occur. Thus, the self-coloring type pressure-sensitive recording sheet is
It is destined to achieve both practically required coloring performance and control of unnecessary coloring stains, and efforts have been made to satisfy both the contradictory properties of coloring and coloring stains. .

Further, in the self-coloring type pressure-sensitive recording sheet, the pressure-sensitive recorded information is inevitably exposed to the public, and when it is desired to hide the information content,
I had to put it in a separate bag.

Up to now, for example, a method of providing a laminating layer by a vacuum adhesion method on the recording layer of a self-coloring type pressure-sensitive recording sheet (Japanese Patent Publication No. Sho 49-10857) or a plastic layer by a melt laminating method has been used. Method recording (Japanese Utility Model Publication No. 52-149709), a method of providing a release layer on these protective layers, or a method of applying a soluble polymer solution on a self-coloring type recording layer and drying to form a film. The method etc. are known. However, in these methods, significant color fog is caused by the destruction of the microcapsules, or the microcapsules are covered with a resin, and the original self-coloring recording property is almost lost, and the color density,
The coloring speed also decreases, and since these methods basically assume that the pressure-sensitive recording portion is exposed, the problem of non-disclosure of recording cannot be solved.

The present applicants have previously proposed the above problems by using a pressure-sensitive recording sheet having a structure in which a self-coloring type pressure-sensitive recording layer, a polyolefin resin laminate layer, an electron beam curable resin layer, and an opaque coating sheet are sequentially laminated. We applied for a pressure-sensitive recording sheet that solves the above problem and can conceal recorded information. In order to confirm the concealed pressure-sensitive recording portion, the user can peel off the portion of the opaque coating sheet from the polyolefin resin laminate layer to disclose and confirm the content.
Furthermore, the electron beam curable resin layer functions as a temporary adhesive layer until the opaque coating sheet is peeled off, and has no re-adhesiveness after peeling off, and therefore has excellent confidentiality. Further, when printing is performed on the surface of the opaque covering sheet, and when a record of the copy is required, a developer or its microcapsule is coated on one surface of the opaque covering sheet which is not in contact with the electron beam curable resin layer. However, similar to the general pressure-sensitive recording of copy slips, if a pressure-sensitive recording paper coated with a separate color former or its microcapsules is used and pressure-sensitive recording is performed, the surface of the opaque coated sheet will be covered. We have found that it is possible to develop colors and to obtain a preliminary record. However, a new problem arose here. That is, when printing with an impact printer from above the opaque coating sheet, it is preferable that the opaque coating sheet is thin in order to develop sufficient color in the pressure-sensitive recording layer. There is a risk that the sheet has insufficient opacity to conceal the recording portion printed on the self-coloring recording layer and the printed content is legible.

[0006]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to reduce the color fog due to friction in a pressure-sensitive recording sheet without sacrificing its original color developability, and at the same time, to improve the copyability and water resistance. Another object of the present invention is to provide a pressure-sensitive recording sheet which satisfies the requirements for chemical resistance, oil resistance, scratch resistance, dust generation suppression, etc., and has sufficient information nondisclosure.

[0007]

DISCLOSURE OF THE INVENTION The inventors of the present invention have invented the pressure-sensitive recording sheet of the present invention as a result of intensive research to solve the above-mentioned problems. That is, the pressure-sensitive recording sheet of the present invention has a structure in which microcapsules containing at least one of a color-developing agent and a color-developing agent are individually laminated or mixed on one surface of a support. In a pressure-sensitive recording sheet in which a pressure recording layer, a polyolefin resin laminate layer, an electron beam curable resin layer, and an opaque coating sheet are sequentially provided,
1 to 50% by weight of a white or colored pigment is mixed in the electron beam curable resin layer.

In the pressure-sensitive recording sheet of the present invention, microcapsules containing at least one of a color-developing agent and a color-developing agent are individually laminated on one side of a support, or are mixed and coated. A step of providing a recording layer, a step of providing a polyolefin resin laminate layer on the recording layer, and a step of integrating the polyolefin resin laminate layer and an opaque coating sheet via an electron beam curable resin layer mixed with a white or colored pigment It can be manufactured by combining the steps of curing the electron beam curable resin by electron beam irradiation.

The details of the present invention will be described below. Examples of white pigments mixed in the electron beam curable resin of the pressure-sensitive recording sheet of the present invention include titanium oxide, barium sulfate, zinc white, lithopone, zinc sulfide, calcium carbonate, gypsum, and lead white. In terms of hiding power, titanium oxide and barium sulfate are particularly excellent. Examples of the colored pigment include ultramarine blue, navy blue, cobalt blue, carbon black, iron black, and the like, and it is preferable to use a colored pigment having the same hue as that of the pressure-sensitive recording layer. These white or colored pigments can be used alone or in combination of two or more kinds.

The amount of the white or colored pigment used in the present invention is 1 to 50 based on the total amount of the electron beam curable resin layer composition.
It is preferably in the weight%. Here, if it is less than 1% by weight, a sufficient hiding effect cannot be obtained, and if it exceeds 50% by weight, the opaque coated sheet is peelable from the polyolefin resin laminate layer, which is not preferable.

In the present invention, examples of the resin that can be used as the electron beam curable resin include compounds having an ethylenically unsaturated bond. More specifically, the following resins can be mentioned.

(1) Poly (meth) acrylate of aliphatic, alicyclic, aromatic, araliphatic polyhydric alcohol and polyalkylene glycol (2) of aliphatic, alicyclic, aromatic, araliphatic Poly (meth) acrylate of polyhydric alcohol obtained by adding alkylene oxide to polyhydric alcohol (3) Polyester poly (meth) acrylate (4) Polyurethane poly (meth) acrylate (5) Epoxy poly (meth) acrylate (6) Polyamide Poly (meth) acrylate (7) Poly (meth) acryloyloxyalkyl phosphate ester (8) Vinyl-based or diene-based compound having a (meth) acryloyloxy group in its side chain or terminal (9) Monofunctional (meth) acrylate , Vinylpyrrolidone, (meth) acryloyl compounds (10) Ethylenically unsaturated compounds (11) Mono- or polycarboxylic acids having an ethylenically unsaturated bond, and their alkali metal salts, ammonium salts, amine salts, etc. (12) Ethylenically unsaturated (meth) acrylamide or alkyl-substituted (meth) ) Acrylamide and its multimers (13) Vinyllactam and polyvinyllactam compounds (14) Polyether having ethylenically unsaturated bond and its ester (15) Ester of alcohol having ethylenically unsaturated bond (16) Ethylenically unsaturated Bonded polyalcohols and esters thereof (17) Aromatic compounds having one or more ethylenically unsaturated bonds such as styrene and divinylbenzene (18) Polyorganosiloxanes having a (meth) acryloyloxy group in the side chain or terminal Compound (19) Ethi Silicone compound having an emission unsaturated bond (20) above (1) to (19) multimeric or oligoester (meth) acrylate modified compounds of the compounds described

These resins can be used alone or in combination with other resins. Further, it can be used without solvent or dissolved in an organic solvent for coating, or emulsified with water or an insoluble organic solvent for coating, drying and curing.

Although the coating amount of the electron beam curable resin is not limited, it is desired that the coating amount be thinner for the purpose of avoiding a decrease in pressure, and preferably ^{2 to} 40 g / m ² or less, more preferably. It is within the range of 3 to ²⁰ g / m ² or less. If it is less than this range, it is difficult to maintain good adhesion, and if it is more than this range, it works as a buffer material for pressure during pressure printing, and pressure-sensitive printing becomes unclear and color development is delayed.

The method of applying the resin for forming the electron beam curable resin layer of the present invention includes gravure roll and transfer roll coater, bar coater, roll coater, air knife coater, U comma coater and AKKU.
Coater, smoothing coater, micro gravure coater, air knife coater, reverse roll coater, 4 or 5 roll coater, blade coater, dip coater, bar coater, rod coater, kiss coater, gate roll coater, squeeze coater, falling curtain coater, slide Any coater such as a coater or a die coater may be used.

The electron beam irradiation used in the present invention has an accelerating voltage of 100 to 1000 KV, more preferably 100 to 300 KV in terms of penetrating power and hardening power.
It is preferable that the absorbed dose of one pass is 0.5 to 20 Mrad. If the accelerating voltage or the electron beam irradiation dose is lower than this range, the electron beam penetrating power is too low to perform sufficient curing, and if it is higher than this range, not only the energy efficiency deteriorates, but also the resin, There are unfavorable effects on quality such as decomposition of additives and reduction of strength of base paper.

The electron beam accelerator may be, for example, an electro curtain system, a scanning type, a double scanning type or the like.

During electron beam irradiation, if the oxygen concentration is high, the curing of the electron beam curable resin is hindered.
Oxygen concentration is less than 600ppm, preferably 400ppm by replacing with inert gas such as helium and carbon dioxide.
Irradiation is preferably performed in an atmosphere suppressed below.

As the support or opaque coated sheet used in the present invention, general paper such as glassine paper, high-quality paper, art paper, coated paper, cast paper, etc. can be used, and wood pulp, synthetic pulp, filler, size Raw materials commonly used in papermaking, such as agents, paper-strengthening agents, and dyes, can be used as necessary. Also, polyethylene,
Plastic sheets such as polypropylene, polyethylene terephthalate and polyamide, and synthetic papers and non-woven fabrics made of these synthetic fibers, or laminated papers with synthetic resin laminated on one or both sides, metal foils or papers with metal foils, vapor-deposited papers, holograms. Treated opaque sheet,
It is also possible to use a laminated product with a synthetic resin film, mica paper, glass paper and the like. These plastic sheets and synthetic resins can be made opaque with inorganic or organic pigments.

The 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, a microcapsule protective agent, and the like. Examples of the microencapsulation method include a coacervation method (US Pat. No. 2,800,458), an interfacial polymerization method (Japanese Patent Publication No. 47-1763, etc.), an in situ polymerization method (Japanese Patent Publication No. 51-9079, etc.). 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 pressure-sensitive recording materials and heat-sensitive recording materials.

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, acid clay, attapulgite, etc.), organic acids (eg, aromatic carboxy compounds such as salicylic acid, or metal salts thereof), mixtures of organic acids and metal compounds, An acidic polymer (for example, phenol-formaldehyde resin, salicylic acid-based resin, or a metal salt thereof) or the like can be used.

In the present invention, as the binder used for forming the pressure-sensitive recording layer, starch, cellulose derivatives such as hydroxyethyl cellulose, methyl cellulose, ethyl cellulose and carboxymethyl cellulose, protein such as casein and gelatin, oxidized starch, ester compound. Aqueous natural polymer compounds such as saccharose 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, styrene /
Water-soluble synthetic polymer compounds such as alkali salts of maleic anhydride copolymers, latex, polyacrylamide, styrene / maleic anhydride copolymers, latexes, water-soluble alkali salts of ethylene / maleic anhydride copolymers, etc. Adhesive, polyvinyl acetate, polyurethane, polyacrylic acid ester, styrene / butadiene copolymer, acrylonitrile / butadiene copolymer, methyl acrylate /
Butadiene copolymer, acrylonitrile / butadiene /
Examples thereof include latex such as acrylic acid copolymer and ethylene / vinyl acetate copolymer.

The pigment used in the pressure-sensitive recording layer includes:
Diatomaceous earth, talc, kaolin, calcined kaolin, calcium carbonate, magnesium carbonate, titanium oxide, zinc oxide,
Examples thereof include silicon oxide, aluminum hydroxide, urea-formalin resin and the like.

In addition, zinc stearate as an auxiliary agent,
Waxes such as higher fatty acid metal salts such as calcium stearate, paraffin, oxidized paraffin, polyethylene, oxidized polyethylene, stearamide, castor wax, etc., dispersant such as sodium dioctylsulfosuccinate, sulfonic acid modified polyvinyl alcohol, benzophenone type, An ultraviolet absorber such as a benzotriazole type, a surfactant, a fluorescent dye and the like are added as necessary.

In the pressure-sensitive recording sheet of the present invention, the method for forming the pressure-sensitive recording layer includes a blade coating method, an air knife coating method, a gravure coating method, a roll coating coating method,
Known coating methods such as a bar coating method and a drop curtain coating method can be used.

Further, 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 pressure sensitive recording layer. Various known techniques in 1) can be added as necessary.

Further, as a constitution of the present invention, calcium carbonate, talc, silica, clay, barium sulfate, magnesium carbonate, magnesium silicate, between the support and the pressure-sensitive recording layer are used in order to obtain a high color density. Inorganic pigments such as lead sulfate, lead white, zinc white, zinc sulfide, satin white, titanium oxide, antimony oxide, mica, bentonite, calcium silicate, gypsum, aluminum hydroxide, or polystyrene, polyvinyltoluene, styrene / divinylbenzene There is no problem in providing an undercoat layer containing fine organic pigments such as polymers, polymethylmethacrylate, urea / formaldehyde polymers, and polyethylene.

In the pressure-sensitive recording sheet according to the present invention,
The support, the pressure-sensitive recording layer, the cured electron beam-curable resin layer, or the opaque coating sheet can be used by printing characters or a tint block. Further, in the present invention, in order to improve the adhesiveness and the wettability, surface treatment such as corona treatment may be carried out.

The pressure-sensitive recording sheet of the present invention has, on the front surface or the back surface thereof, a printing layer, a color-developing layer or a color-developing layer or both, a protective coating layer, a pressure-sensitive adhesive layer, a peeling layer, a printing layer on a general paper. The layer, the toner receiving layer, the ink receiving layer, the thermosensitive recording layer, the writing layer, the magnetic recording layer and the like can be provided alone or simultaneously. The recording method may be any method such as writing with a pencil or ink, an impact printer, a thermal printer, an ink jet printer, a fusion thermal transfer printer, a sublimation type thermal transfer printer, or a label sticking. Especially in the pressure recording method,
It is also possible to develop color only on the front surface or the back surface by controlling the applied pressure. Further, the pressure-sensitive recording sheet of the present invention can be used as a series of copy sheets in combination with other pressure-sensitive recording sheet, back carbon copying sheet, adhesive sheet, printing sheet, transparent film and the like.

[0034]

In the pressure-sensitive recording sheet of the present invention, an opaque coated sheet having a pressure-sensitive recording property is integrated with a self-coloring type pressure-sensitive recording paper provided with a polyolefin resin laminate layer by using an electron beam curable resin. This enables copying without impairing the color developability of the opaque coating sheet and the color developability of the self-coloring type pressure-sensitive recording layer, and further provides a high hiding white pigment or hiding property in the electron beam curable resin. In addition, by mixing a colored pigment exhibiting a protective color effect, the information in the pressure-sensitive recording layer can be hidden, and due to the action of the electron beam curable resin, it cannot be re-bonded after the opaque coating sheet is once peeled off. It has a function.

[0035]

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 stated, the value indicating the coating amount is the coating amount after drying.

Preliminary Operation [Preparation of Pressure Sensitive Recording Layer] Microcapsules containing a color former used for the pressure sensitive recording layer were prepared as follows. First, 10 parts of crystal violet lactone is added to Hisol SAS
N-296 (manufactured by Nippon Petrochemical Co., Ltd.) was heated and dissolved to obtain an internal phase oil. 10 parts of melamine and 25 parts of 37% formalin were heated together with 100 parts of water at pH 8 to obtain a melamine-formalin initial polycondensate. Then, the internal phase oil was added to a 5% styrene / maleic anhydride copolymer aqueous solution 150.
Part, and the above melamine-formalin polycondensate is added to this emulsion and the liquid temperature is kept at 70 ° C. for 2 hours to obtain a microcapsule dispersion liquid containing a coloring agent having a melamine-formalin resin film. Got The average particle size of the obtained microcapsules was about 6 μm.

The coating liquid for the pressure-sensitive recording layer was prepared by the following formulation. The unit is dry parts by weight. Microcapsules containing color former 110 parts Developer (PR26298 manufactured by Sumitomo Durez Co., Ltd.) 60 parts Starch particles 280 parts Kaolin clay 70 parts Oxidized starch 100 parts

The self-coloring type pressure-sensitive recording sheet was prepared as follows. That is, on a high-quality paper with a basis weight of 100 g / m ² ,
The pressure-sensitive recording layer coating solution having the above composition was applied so that the coating amount was 8 g / m ² , to obtain a self-coloring pressure-sensitive recording sheet. The opaque coated sheet is a sheet of commercially available pressure-sensitive recording paper for slips (manufactured by Mitsubishi Paper Mills Ltd., under Mitsubishi NCR Super, N30,
The basis weight of 30 g / m ² was used as it was.

Example 1 A polypropylene (density: 0.90) was formed on the recording surface of a self-coloring pressure-sensitive recording sheet prepared in a preliminary operation using a melt extrusion die as a polyolefin resin laminate layer.
0 g / cc) was laminated to have a thickness of 10 μm.
In addition, a bifunctional acrylate as an electron beam curable resin (Aronix M-803 manufactured by Toagosei Kagaku Kogyo Co., Ltd.)
0: Aronix M-210 8: 2 mixture) 10 parts of a coating liquid prepared by dispersing 5 parts of rutile type titanium oxide in 95 parts.
/ M ² coating with an offset gravure coater, and then overlaying it so that the non-coated surface of the opaque coating sheet (lower paper) is in contact with the electron beam curable resin, and irradiating with electron beam after nitrogen substitution. Electron beam accelerating voltage of 200
The target pressure sensitive recording sheet was obtained by irradiating with an electron beam of kV and an absorbed dose of 2 Mrad to cure.

Example 2 The same as Example 1 except that the rutile type titanium oxide of Example 1 was replaced with barium sulfate and the mixing amounts of the electron beam curable resin and barium sulfate were changed to 50 parts and 50 parts, respectively. To obtain a desired pressure-sensitive recording sheet.

Example 3 Production was carried out in the same manner as in Example 1 except that the rutile type titanium oxide of Example 1 was replaced with ultramarine blue, and the mixing amounts of the electron beam curable resin and ultramarine blue were changed to 85 parts and 15 parts, respectively. Then, a target pressure-sensitive recording sheet was obtained.

Example 4 The rutile type titanium oxide of Example 1 was replaced with cobalt blue,
The mixing amount of electron beam curable resin and cobalt blue is 90 each.
To prepare the target pressure-sensitive recording sheet in the same manner as in Example 1 except that 10 parts and 10 parts were used.

Example 5 The same as Example 1 except that the rutile type titanium oxide of Example 1 was replaced with iron black and the mixing amounts of the electron beam curable resin and iron black were changed to 97 parts and 3 parts, respectively. To obtain a desired pressure-sensitive recording sheet.

Example 6 Production was carried out in the same manner as in Example 1 except that the rutile type titanium oxide of Example 1 was changed to dark blue, and the mixing amounts of the electron beam curable resin and dark blue were changed to 85 parts and 15 parts, respectively. Then, a target pressure-sensitive recording sheet was obtained.

Example 7 The same as Example 1 except that the rutile type titanium oxide of Example 1 was replaced with carbon black, and the mixing amounts of the electron beam curable resin and carbon black were changed to 99 parts and 1 part, respectively. To obtain a desired pressure-sensitive recording sheet.

Comparative Example 1 In the same manner as in Example 1, a self-coloring pressure-sensitive recording sheet was provided with a polyolefin resin laminate layer on the pressure-sensitive recording body, and a white or colored pigment was not added on the pressure-sensitive recording medium to obtain an electronic image. Only 10 g of bifunctional acrylate (Aronix M-210 manufactured by Toagosei Co., Ltd.) as a radiation curable resin
/ M ² coating with an offset gravure coater, and then overlaying it so that the non-coated surface of the opaque coating sheet (lower paper) is in contact with the electron beam curable resin, and irradiating with electron beam after nitrogen substitution. Electron beam accelerating voltage of 200k when installed in a device (Electrocurtain manufactured by Energy Science)
V, electron beam irradiation of absorbed dose 2Mrad, and cured,
A pressure sensitive recording sheet was obtained.

Comparative Example 2 A sample was prepared in the same manner as in Example 1 except that the electron beam curable resin of Example 1 and the rutile-type titanium oxide were mixed in amounts of 99.5 parts and 0.5 parts, respectively. A pressure recording sheet was obtained.

Comparative Example 3 The same procedure as in Example 1 was carried out except that the rutile type titanium oxide of Example 1 was changed to dark blue, and the mixing amounts of the electron beam curable resin and dark blue were changed to 48 parts and 52 parts, respectively. Then, a pressure-sensitive recording sheet was obtained.

Test: Examples 1 to 7 and Comparative Examples 1 to 3
The color-developing density, the peeling property and the hiding property of the self-coloring pressure-sensitive recording layer portion of the pressure-sensitive recording sheet prepared in the above were evaluated. The respective results are shown in Table 1.

[Coloring Density] The coloring density of each pressure-sensitive recording sheet is fixed by applying a certain weight on the opaque covering sheet, and then the opaque covering sheet is peeled off to expose the color printed surface, and the coloring density is reflected by Macbeth RD919. It was measured with a densitometer.

[Peelability] Peelability is the 180 degree peel strength (sample width 30 mm) using a Tensilon universal testing machine when peeling the opaque coating sheet of each pressure-sensitive recording sheet from the polyolefin resin laminate layer. It was measured. The unit of numerical values in Table 1 is gf / 30 mm.

[Hiding property] What is the percentage of the printed characters when 500 characters are printed from the top of the opaque coating sheet by a dot impact printer without an ink ribbon attached
It was judged whether it was legible. The percentage of legible characters is 1
% Or less was judged to be excellent, 1 to 3% was average, and those readable at a ratio higher than 3% were judged to be inferior.

[0053]

[Table 1]

Evaluation: Each of the pressure-sensitive recording sheets of Examples 1 to 7 had good color density in the self-coloring pressure-sensitive recording portion, and also had good releasability of the opaque coating sheet from the polyolefin resin laminate layer. It was Furthermore, the content of the pressure-sensitive recording was very excellent in terms of concealment.

On the other hand, as a comparison, the electron beam curable resins obtained in Comparative Examples 1 to 3 contain no white or colored pigment, or only a very small amount, or a large amount. In this case, the coloring density was comparable to that of the example, but in Comparative Examples 1 and 2, the hiding property of the recorded portion was insufficient, and in Comparative Example 3, the peel strength was heavy and the peeling was unstable. However, the opaque cover sheet has a drawback that the paper layer is destroyed.

[0060]

In the pressure-sensitive recording sheet of the present invention, microcapsules containing at least one of a color-developing agent and a color-developing agent are individually laminated or mixed on one side of a support. A pressure-sensitive recording sheet in which a coated pressure-sensitive recording layer, a polyolefin resin laminate layer, an electron beam curable resin layer, and an opaque coating sheet are sequentially provided, and the electron beam curable resin layer contains 1 to 50% by weight of white or By mixing a colored pigment, the opacity of the electron beam curable resin layer can be increased, and the self-coloring pressure-sensitive recording portion can be effectively treated.
A sufficient hiding property can be obtained by performing "blinding". In particular, a protective color effect can be obtained by using a colored pigment having the same color as that of the color development of the self-coloring pressure-sensitive recording portion. Good recording density at the time of pressure recording, gloss on the printed surface, scratch resistance, and abrasion resistance are maintained, and since the opaque coating sheet is provided, pressure-sensitive information can be exposed to the outside and handled without being exposed, Moreover, the pressure-sensitive recorded information can be read by peeling off the opaque cover sheet if necessary.As described above, the present invention can be used for continuous slips, sticky slips, labels, postcards, and other communication messages, for recording, It can be used for many purposes such as dust-free recording paper and has high practical value.

Claims (2)

[Claims] 1. A pressure-sensitive recording layer and a polyolefin resin, wherein microcapsules containing at least one of a color-developing agent and a color-developing agent are separately laminated or mixed on one surface of a support. A pressure-sensitive recording sheet in which a laminate layer, an electron beam curable resin layer, and an opaque coating sheet are sequentially provided, wherein 1 to 50% by weight of a white or colored pigment is mixed in the electron beam curable resin layer. And pressure sensitive recording sheet. 2. The white pigment is one or more white pigments selected from titanium oxide and barium sulfate, and the colored pigment is
The pressure-sensitive recording sheet according to claim 1, which is one or more kinds of colored pigments selected from ultramarine blue, dark blue, cobalt blue, carbon black, and iron black.