JPH09123595A - Decoloring self-luminous pressure sensitive recording sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To examine the genuineness of sheet easily based on the pressure sensitive self luminous properties by laminating a single self luminous pressure sensitive recording layer containing microcapsules of at least one of coloring agent or developer, and a decoloring layer containing desensitizer or capsules thereof sequentially on a support. SOLUTION: At least one of coloring agent 3 or developer 4 is microcapsulated and laminated independently on a support 1 or they are mixed into a single layer on the support 1 thus forming a self luminous pressure sensitive recording layer 2. An aqueous intermediate layer 6, and a clecoloring layer 7 containing desensitizer or capsules thereof 5 are laminated sequentially thereon to obtain a pressure sensitive recording sheet. Alternatively, a clecoloring layer and a self luminous pressure sensitive recording layer are provided on one side of support 1 and an ink receiving layer for ink jet recording is provided on the opposite side thereof thus forming a self luminous pressure sensitive recording sheet. The self luminous pressure sensitive recording layer 2 employs the wall material of microcapsule, coloring agent, developer, desensitizer, adhesive resin, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to recording paper having anti-counterfeit property, and the basic anti-counterfeit property is provided by pressure-sensitive color development. For example, an inkjet / decoloring type self-developing pressure-sensitive recording sheet having anti-counterfeiting property according to the present invention can be easily ink-jet printed by using an ink jet printer and can be easily sensed by an impact printer or simple pressure. The present invention relates to an ink jet recording capable of pressure color development and a pressure sensitive color development type recording sheet. The printing / erasing type self-coloring pressure-sensitive recording sheet can be used for ordinary securities printing and cash voucher printing, and the recording sheet that can check its authenticity and the magnetic recording / decoloring self-coloring pressure-sensitive recording sheet are Counterfeiting can be prevented by combining both color development and magnetic recording, and the heat-sensitive / decoloring type self-coloring pressure-sensitive recording sheet can be printed on one side by heat-sensitive recording, while the authenticity of the ticket is determined by pressure-sensitive coloring. The checkable sheet and the decolorizable self-coloring pressure-sensitive recording label provide a label capable of confirming anti-counterfeiting property even after the label is attached to an adherend.
Such a series of recording sheets can be checked for their authenticity by pressure-sensitive coloring, and after the authenticity is confirmed, the pressure-sensitive colored portions will be erased over time. Can be used, saved. The recording sheet of the present invention can be used for slips, forms, recording paper, toys, communications, securities, cash vouchers, tickets, tickets, documents, stickers, lottery, labels, etc. A recording sheet having properties.

[0002]

2. Description of the Related Art A colorless image formed by a reaction between an electron-donating or proton-accepting colorless organic compound (hereinafter referred to as a color former) and an electron-accepting or proton-releasing agent (hereinafter referred to as a developer) It has been known since ancient times. As a concrete use of this phenomenon, pressure-sensitive copying papers (for example, US Pat. Nos. 2,505,470 and 2,505,489) are disclosed.
No. 2550547, No. 2548366, No. 27
No. 12507, No. 2730456, No. 2730457
No. 3,418,250, No. 3,672,935), thermal recording paper (for example, Japanese Patent Publication No. 43-4160, No. 43-7).
No. 600, No. 45-14039, U.S. Pat. No. 29390.
No. 09) and the like. Further, a printing method is known in which an ink containing a color-developing agent is supplied to a sheet coated with a color-developing agent to obtain a colored image (German Patent Application (OLS) 193).
9962).

The color developer has the properties defined above and includes clays, phenol resins, aromatic carboxylic acids and metal salts thereof.

In general, in pressure-sensitive copying paper, a combination of a microcapsule-containing layer containing the above-mentioned color-forming agent and a color-developing agent is used to obtain a color-developed image. It is performed by destroying the microcapsules by pressure or the like and bringing the color-developing agent and the color-developing agent into contact with each other.

Generally, these color developers are used as a color developer sheet uniformly coated on the entire surface of a support. However, depending on the purpose of use of pressure-sensitive copying paper, the color developer sheet may have a recording unnecessary portion. In such a case, a desensitizing ink containing a desensitizing agent is applied to that portion of the developer sheet by printing or the like for desensitization.

Desensitizing inks used for such purposes include, for example, US Pat. No. 2,777,780, Japanese Patent Publication Nos. 44-27255, 45-21448, and 46-.
22651, 46-29546 and JP-A-47-3.
No. 2915, Japanese Patent Publication Nos. 47-38201, 48-40
50, JP-A-48-6805, JP-B-49-448
No. 4, No. 49-19647, No. 49-23008,
49-23850, JP-A-49-43708, 49-72009, 49-77709, 49-.
77710, 49-15513, 49-835.
09, German Patent Application (OLS) 2343800,
2359079 and 2361856. Tokiko 58
-38119, JP-A-63-74681, 63-
41184 and the like. The technology disclosed in these patents is a technology in which a specific portion of a pressure-sensitive color-developing paper is not developed at all, and desensitization is generally achieved by printing on the pressure-sensitive paper (especially the developer sheet). .

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 convenient in that a microcapsule containing a color former is provided on the support, and a developer such as acid clay, phenol resin, or organic acidic substance is further provided on the coating layer.
A manufacturing method by a two-layer coating (including those in which the coating order is reversed) consisting of steps, or a manufacturing method by one-layer coating by microcapsulating at least one of the above-mentioned two components and mixing them uniformly (Japanese Patent Publication No. No. 47-16096) is known.

As a matter of course, in the self-coloring pressure-sensitive recording sheet, since both the color former and the developer are present in close proximity to the surface of the support, the color is developed by a little friction or pressure, and therefore the abrasion resistance is low. It is necessary to apply, as a simple method of imparting abrasion resistance, wheat starch particles having a larger particle size than microcapsules are dispersed in the self-coloring pressure-sensitive recording layer,
Some are designed so that color does not develop carelessly with some pressure.

In recent years, in a wide range of fields such as printers and recorders for various measuring instruments, printers for labels, printers for POS, and vending machines such as ticket and admission ticket, ink jet method, thermal method, thermal transfer method, etc. Records have come to be used. In particular, ink jet recording is convenient for use in business offices, retail stores, and homes because both monochrome and color recording are possible, and thermal recording is maintenance-free and easy to obtain.

However, since these records can be easily printed in the same way due to the development of color copying machines, personal computers, printers, and printing fonts, there is a problem that they can be easily forged when they are treated as cash vouchers such as ticket. It was For the purpose of anti-counterfeiting, such a so-called cash voucher recording paper is printed with a tint block for anti-counterfeiting, or is printed with anti-counterfeiting by micro characters, but with the development of color copying in recent years, With regard to printing, even amateurs can easily make duplicates. In this situation, not only a cash voucher, but also a price tag, a label on which product details are entered, a speed lottery, or the like is easy to duplicate.

Due to the development of counterfeiting methods in social life (particularly due to color copying), not only tickets and ticket vouchers but also labels, price tags, documents, etc. are targeted. There is no leakage. In other words, besides cash vouchers such as admission tickets, tickets, stamps, stamps, bills, checks, certificates, etc., labels and manuals such as books, CDs, game software, etc. which are circulating in the world, price tags of products, lotteries of all kinds At present, voting tickets (e.g. betting tickets) and company stationery can be easily made by color copying.

In ink-jet recording, heat-sensitive recording, etc., a printer that can be used is limited only by a single color-developing method. Therefore, a recording paper which can be printed by both the ink-jet recording head, the heat-sensitive recording head and the impact head is desired. It was One of the reasons for this is that since only one type of recording method such as inkjet recording, thermal recording head, or pressure-sensitive recording can be easily counterfeited as described above, at least two or more recording methods can be used in combination. The development of a recording sheet for

In the color-developing system of the self-coloring pressure-sensitive recording, since both the color-developing agent and the color-developing agent are present in close proximity to the surface of the support, the color is developed by a little friction or pressure, and it is combined with other recording methods. If so, it is possible to prevent forgery, but it is necessary to impart abrasion resistance because of the function of developing color by this light pressure. As a simple method for imparting abrasion resistance, there is a method in which wheat starch particles having a particle size larger than that of the microcapsules are dispersed in the self-coloring pressure-sensitive recording layer so that the color is not carelessly developed under some pressure. However, when such a cushioning material (stilt material) is used in combination, the abrasion resistance effect is limited, and even in the case of a self-coloring pressure-sensitive recording sheet with extremely improved abrasion resistance, the printing is performed on the pressure-sensitive paper. If it is not a printer designed for use, there is a problem that the self-coloring pressure-sensitive recording layer develops color by a paper feed roll or the like. Due to such poor abrasion resistance, there was a dilemma that the traces of the paper feed roll would be colored and unusable if it was passed through, for example, an ink jet printer, a thermal printer, a magnetic recording reader / writer.

Further, in the case of the self-coloring pressure-sensitive recording sheet, a personal computer of recent years, like the ink jet recording material,
Since the same printing can be easily performed due to the development of printers and printing fonts, there is a problem that it is easy to forge when handling it as a cash voucher. The point that the copy-forgery-inhibited pattern printing for preventing forgery can be duplicated by color copying is also the same as in the case of inkjet.

A magnetic recording method is often used as a means for preventing forgery or a means for mechanizing information processing. The magnetic recording method is rarely used as a magnetic recording alone, and is usually used in combination with magnetic recording and inkjet recording, magnetic recording and printing (or anti-counterfeit printing), magnetic recording and thermal transfer recording. In general,
It is used in many fields such as magnetic tickets, magnetic admission tickets, betting tickets such as betting tickets, prepaid cards, credit cards, magnetic coupons, etc.However, magnetic recording is a mechanical process and its magnetic information is basically Can be forged by making magnetic recording paper with the exact same magnetic characteristics. This can be seen from the large number of counterfeit telephone cards, which are one type of magnetic recording sheet. A ticket or the like uses magnetic information and heat-sensitive recording information, or magnetic information and fusion thermal transfer recording information in combination. Generally, since decoding is based only on magnetic information, if the magnetic information is decoded, the forgery prevention property is extremely low. Decoding is based only on magnetic information because it is not suitable for extremely short-time processing such as automatic ticket gates because the thermal recording or the melting thermal transfer recording is character information.

In order to solve these problems, the present inventors applied for an invention of a coloring / decoloring type self-coloring pressure-sensitive recording sheet containing a desensitizer capsule in the self-coloring pressure-sensitive recording layer. . However, when the desensitizer capsules are simultaneously included in the self-coloring pressure-sensitive recording layer, the color density under pressurization is not so high and the time until decoloring (erasing time)
It became clear that there was a problem of not being able to control freely. In other words, after confirming the authenticity of the recording sheet by coloring, the existing color-decoloring self-coloring pressure-sensitive recording sheet will be erased in about half a day. There was a demand for control of the erasing time, such as the need to do so. Also, although it seems to conflict with the phenomenon that the coloring density is not so high, since the coloring layer is present on the outermost surface, it tends to be smudged by rubbing (low abrasion resistance) when used as a general recording paper. Had.

[0017]

SUMMARY OF THE INVENTION Therefore, the problem to be solved by the present invention is to have the coloring property of a self-coloring pressure-sensitive recording sheet, and to easily develop the color by a pressure, a foam printing machine, an impact printer, etc. when necessary. It is possible to do so, and the color development part erases with a controlled erasing time, so the need for reconfirmation is saved, the color development part is not unsightly, the abrasion resistance is high, and other recording (inkjet recording, thermal recording, printing etc.) The present invention provides a pressure-sensitive decoloring type self-developing pressure-sensitive recording sheet.

The first specific problem to be solved by the present invention is that self-coloring type pressure-sensitive recording is possible, and the pressure-sensitive colored portion disappears with time, and the trace of the coloring disappears. Paper, that is, even if pressure-sensitive color development (because it erases color)
It is to provide a recording sheet that is not unsightly. That is, the authenticity of the recording sheet is confirmed by the pressure-sensitive self-coloring property.
Further, when the authenticity of the recording sheet is confirmed by the pressure-sensitive self-coloring property, the recording sheet is provided so that the color-developing portion for confirmation is erased at the set decoloring time so that the confirmation portion cannot be seen. .

A second specific problem to be solved by the present invention is to impart anti-counterfeit property to a recording sheet by recording by two methods of pressure sensitive recording and ink jet recording. Basically, inkjet recording is performed on a recording sheet, and the authenticity of the sheet is confirmed by the pressure-sensitive self-coloring property. Further, when the authenticity of the recording sheet is confirmed by the pressure-sensitive self-coloring property, the color-developed portion for confirmation is erased at the set decoloring time so that the confirmed portion cannot be seen.

The third problem to be solved by the present invention is
Recording is performed by two methods, pressure-sensitive recording and heat-sensitive recording, to impart anti-counterfeit property to the recording sheet. Basically, thermosensitive recording is performed on a recording sheet, and the authenticity of the sheet is confirmed by the pressure-sensitive self-coloring property. Further, when the authenticity of the recording sheet is confirmed by the self-coloring pressure-sensitive recording, the coloring portion for confirmation is erased at the set decoloring time so that the confirmation portion cannot be seen.

A fourth problem to be solved by the present invention is
Another object of the present invention is to provide a decolorizable self-coloring pressure-sensitive recording sheet having a pigment coating layer for printing on the surface. By providing a pigment coating layer for printing, a wide range of forgery prevention can be achieved by combining a forgery prevention means such as micro character printing with advanced printing and a handy forgery detection method of pressure-sensitive self-coloring. You can Furthermore, when the authenticity of the recording sheet is confirmed by the pressure-sensitive self-coloring property, the color-developing portion for confirmation can be erased at the set decoloring time and the confirmation portion cannot be seen. After confirming the authenticity, it is not unsightly.

A fifth problem to be solved by the present invention is to obtain a magnetic recording sheet having pressure-sensitive self-coloring / decoloring property as one of means for preventing forgery. In such a magnetic recording / decoloring type self-coloring pressure-sensitive recording sheet, not only it is possible to prevent forgery in each of the magnetic recording, the pressure-sensitive color recording and the printing portion, but also the pressure-sensitive self-coloring property When the authenticity of the recording sheet is confirmed by, the colored part for confirmation can be erased at the set erasing time and the confirmed part can be hidden, so even if it is used for tickets or entrance tickets, it will be unsightly after confirmation of the authenticity. Absent.

A sixth problem to be solved by the present invention is to provide a self-coloring decolorizable pressure-sensitive recording label. The main information recording is performed by printing, etc., and the authenticity of the label itself is confirmed using the pressure-sensitive self-coloring property. Further, when the authenticity of the label is confirmed by the pressure-sensitive self-coloring property, the color-developing portion for confirmation can be erased at the set decoloring time so that the confirmation portion cannot be seen.

[0024]

At least one of a support, a color former and a developer is microencapsulated,
A decolorizing type self-coloring pressure-sensitive recording sheet comprising a single layer of a self-coloring pressure-sensitive recording layer and a decoloring layer containing a desensitizing agent or a desensitizing agent capsule, which are sequentially laminated by themselves or mixed.

At least one of a support, a color-developing agent and a color-developing agent is microencapsulated, and they are laminated or mixed individually to form a single layer of a self-coloring pressure-sensitive recording layer, an aqueous intermediate layer, a desensitizer or a desensitizer. An erasable type self-coloring pressure-sensitive recording sheet in which erasing layers including capsules are sequentially laminated.

The support has a decolorizing layer and a self-coloring pressure-sensitive recording layer on one surface, and an ink receiving layer for ink jet recording (hereinafter, simply ink receiving layer) on the surface opposite to the support.
An inkjet / erasable self-coloring pressure-sensitive recording sheet provided with.

A heat-sensitive / bleachable self-coloring pressure-sensitive recording sheet having a decoloring layer and a self-coloring pressure-sensitive recording layer on one side of a support, and a thermosensitive recording layer provided on the opposite side of the support.

A printing / decoloring type self-developing pressure-sensitive pressure-sensitive recording paper comprising a support having a decoloring layer and a self-coloring pressure-sensitive recording layer on one surface, and a printing pigment coating layer provided on the opposite surface of the support. Recording sheet.

A magnetic recording / decoloring type self-coloring pressure-sensitive recording sheet having a decoloring layer and a self-coloring pressure-sensitive recording layer on one surface of a support, and a magnetic recording layer provided on the opposite surface of the support. .

A decolorizable type self-coloring pressure-sensitive recording label having a decoloring layer and a self-coloring pressure-sensitive recording layer on one side of a support, and an adhesive layer provided on the opposite side of the support. .

A forgery prevention or forgery detection method using a pressure-sensitive recording sheet, which can perform pressure-sensitive self-coloring, and whose color-developed portion is decolored within a set decoloring time.

The details of the present invention will be described below.

As the support used in the present invention, ordinary natural pulp paper such as high-quality paper, art paper, glassine paper, cast paper and coated paper can be used, and wood pulp, synthetic pulp, filler and sizing agent can be used. Raw materials usually used in papermaking, such as an anti-UV agent, an antioxidant, a pigment, a paper-strengthening agent, and a dye, can be used as necessary. Further, polyethylene, polypropylene, polyethylene terephthalate, polyamide, polyvinyl chloride, polyvinylidene chloride, plastic sheet such as polymethylpentene, and synthetic paper or nonwoven fabric made of these synthetic fibers, or one side of these synthetic resins, or You may use the laminated paper laminated on both sides. All supports may be white or colored.

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 microcapsulation method, a wall material of the microcapsule, a color former or an oil dissolving the color former, a color developer, a desensitizer, an adhesive resin, a microcapsule protective agent, or the like.

As the microencapsulation method, a coacervation method (such as US Pat. No. 2,800,458), an interfacial polymerization method (such as Japanese Patent Publication No. 47-1763), and an in-situ polymerization method (Japanese Patent Laid-Open No. 51-9079). Gazette etc.) can be used.

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

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-developing agent, triallylmethane compounds, diarylmethane compounds, xanthene compounds, thiazine compounds, spiropyran compounds, diphenylmethane dyes, spiro dyes, lactam dyes, fluorane dyes, etc. 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.

Specifically, 3,3-bis (p-dimethylaminophenyl) -6-dimethylaminophthalide, 3,
3-bis (p-dimethylaminophenyl) phthalide, 3
-(P-dimethylaminophenyl) -3- (1,2-dimethylindol-3-yl) phthalide, 3- (p-
Dimethylaminophenyl) -3- (2-methylindo-
Ru-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
-Phenylindol-3-yl) -6-dimethylaminophthalide, 3-p-dimethylaminophenyl-3-
Triallylmethane dyes such as (1-methylpyrrol-3-yl) -6-dimethylaminophthalide, 4,4′-
Bis-dimethylaminobenzhydrylbenzyl ether, N-halophenyl, leuco-lamin, N-2,
Diphenylmethane dyes such as 4,5-trichlorophenylleuco-olamine, thiazine dyes such as benzoylleuco methylene blu, p-nitrobenzoyl leuco methylene blu, 3-methyl-spiro-dinaphthopyran, 3-ethyl-spiro- Dinaphthopyran, 3-phenyl-spiro-dinaphthopyran, 3-benzyl-spiro-
Spiro dyes such as dinaphthopyran, 3-methyl-naphtho (6′-methoxybenzo) spiropyran, and 3-propyl-spiro-dibenzopyran, rhodamine-B-anilinolactam, rhodamine (p-nitroanilino) lactam, Lactam-based dyes such as rhodamine (o-chloroanilino) lactam,

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-methylaminofluoran, 3-diethylamino-7-N-methylaminofluoran, 3-dimethylamino-7-dibenzylaminofluoran, 3-diethylamino-7-methyl-N
-Benzylaminofluoran, 3-diethylamino-7
-N-chloroethyl-N-methylaminofluoran, 3
-Diethylamino-7-N-diethylaminofluoran, 3- (N-ethyl-p-toluidino) -6-methyl-7-phenylaminofluoran, 3- (N-ethyl-
(p-Toluidino) -6-methyl-7- (p-toluidino) fluoran, 3-diethylamino-6-methyl-7
-Phenylaminofluoran, 3-diethylamino-7
-(2-carbomethoxy-phenylamino) fluorane, 3- (N-ethyl-N-iso-amylamino) -6
-Methyl-7-phenylaminofluoran, 3- (N-
Cyclohexyl-N-methylamino) -6-methyl-7
-Phenylaminofluoran, 3-piperidino-6-methyl-7-phenylaminofluoran, 3-pyrrolidino-6-methyl-7-phenylaminofluoran, 3-diethylamino-6-methyl-7-xylidinofluoran , 3-diethylamino-7- (o-chlorophenylamino) fluoran, 3-dibutylamino-7- (o-chlorophenylamino) fluoran, 3-pyrrolidino-6
And fluoran-based dyes such as -methyl-7-p-butylphenylaminofluoran.

As the oil for dissolving the color former, aromatic synthetic oils such as diarylalkane series, alkylnaphthalene series, alkylated biphenyls and hydrogenated terphenyls, 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 (eg phenol / formaldehyde resins,
Salicylic acid resin or zinc, magnesium,
Aluminum, calcium, titanium, manganese, tin,
Polyvalent metal salts such as nickel) and the like can be used.

As the developer for heat-sensitive recording used in the present invention, an electron-accepting substance generally used in heat-sensitive paper is used, and particularly, phenol derivative, aromatic carboxylic acid derivative or its metal compound, N , N'-diarylthiourea derivatives, mixtures of organic acids and metal compounds, acidic polymers (for example phenol / formaldehyde resins, salicylic acid resins or their zinc, magnesium, aluminum, calcium, titanium, manganese, tin, nickel And the like), especially phenol derivatives, aromatic carboxylic acid derivatives or metal compounds thereof, N, N'-diarylthiourea derivatives and the like.

Of these, particularly preferable are phenol derivatives, aromatic carboxylic acids and phenolic compounds thereof, specifically, 1,1-bis (p-hydroxyphenyl) propane, 2, 2-bis (p-hydroxyphenyl) propane, 2,2-bis (p-hydroxyphenyl) butane, 2,2-bis (p-hydroxyphenyl) hexane, bisphenol sulfone, bis (3-
Allyl-4-hydroxyphenyl) sulfone, 4-hydroxy-4'-isopropyloxydiphenylsulfone, 3,4-dihydroxy-4'-methyldiphenylsulfone, diphenol ether, p-hydroxybenzoic acid benzyl, p-hydroxy Propyl benzoate, p
-Butyl hydroxybenzoate, p-tert-butylbenzoic acid, trichlorobenzoic acid, octyl 4-hydroxybenzoate, benzoic acid, terephthalic acid, 3-sec-butyl-4
-Hydroxybenzoic acid, 3-cyclohexyl-4-hydroxybenzoic acid, 3,5-dimethyl-4-hydroxybenzoic acid, salicylic acid, 3-isopropylsalicylic acid, 3
-Tert-butylsalicylic acid, 3-benzylsalicylic acid,
3- (α-methylbenzyl) salicylic acid, 3-chloro-
5- (α-methylbenzyl), 3,5-di-α-methylbenzylsalicylic acid, 3,5-di-tert-butylsalicylic acid, 3-phenyl-5- (α, α-dimethylbenzyl) salicylic acid, 4- tert-butylphenol, 4-hydroxydiphenoxide, α-naphthol, β-naphthol, 4-hydroxyacetophenol, 4-tert-catechol, 2,2′-dihydroxydiphenol , 2,
2'-methylenebis (4-methyl-6-tert-isobutylphenol, 4,4'-isopropylidenebis (2-
tert-butylphenol), 4,4'-sec-butylidene diphenol, 4-phenylphenol, 4,4 '
-Isopropylidenediphenol, 2,2'-methylenebis (4-chlorophenol), hydroquinone, 4,
Examples thereof include phenolic compounds such as 4'-cyclohexylidene diphenol, dimethyl 4-hydroxyphthalate, hydroquinone monobenzyl ether, novolac type phenol resin and phenol polymer.

Pigments used in the self-coloring pressure-sensitive recording layer and the aqueous intermediate layer include diatomaceous earth, talc, kaolin, calcined kaolin, calcium carbonate, magnesium carbonate, titanium oxide, zinc oxide, silicon oxide and hydroxide. Aluminum, urea-formalin resin, etc. may be mentioned.

In addition, as auxiliary agents, higher fatty acid metal salts such as zinc stearate and calcium stearate,
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, Further, surfactants, fluorescent dyes, antistatic agents, thickeners, preservatives, antioxidants, defoamers, release agents, lubricants, antiblocking agents, tackifiers, etc. are self-coloring pressure-sensitive recording layers, It is added as necessary in the aqueous polymer intermediate layer and the polyolefin resin layer.

Further, a back coating 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 the constitution of the present invention, in order to obtain a high color-developing 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,
An anchor layer containing inorganic pigments such as gypsum and aluminum hydroxide, or finely divided organic pigments such as polystyrene, polyvinyl toluene, styrene / divinylbenzene copolymer, polymethyl methacrylate, urea / formaldehyde polymer, polyethylene, etc. Dispersion in the color-forming pressure-sensitive recording layer does not matter at all.

The desensitizing agent used in the present invention is used as a component of desensitizing ink as follows. That is, the color-developed character is recorded on the pressure-sensitive recording paper due to the reaction between the color-developing agent and the color-developing agent, but depending on the form of the slip, it may not be able to be read as the color-developed character. In the market, a desensitizer is made into an ink and printed on the surface of a layer containing a color developer.

The desensitizing ink is prepared by mixing the desensitizing agent with an ink resin that functions as an appropriate adhesive, a pigment such as titanium oxide or calcium carbonate, a solvent for dissolving or diluting the resin or the desensitizing agent, and the like. However, desensitizing inks for letterpress, offset, flexo, etc. are commercially available depending on the form of the ink or the printing method. UV-curing desensitizing inks are also commercially available to increase the drying speed.

Regarding these desensitizing inks, US Pat. No. 2,777,805, JP-B-44-27255, JP-B-45-21448, and JP-A-46-22651.
No. 46, 29546 and No. 47-3820.
No. 1, gazette 48-4050, gazette 49-4484.
No. 49, 19647 and No. 49-2300.
8 gazette, the same 49-23850 gazette, the same 58-381.
19, Japanese Unexamined Patent Publication No. 47-32915, 48-
6805, 49-43708, 49-
72009, 49-77709, 49.
-77710 gazette, the same 49-15513 gazette, the same 4
No. 9-83509, No. 63-74681, No. 63-41184, No. 63-94879,
No. 63-139781, Japanese Patent Laid-Open No. 2-20477, German Patent Application (OLS) 2343800, No. 23590759, No. 2361856, and the like. However, these desensitizing inks have been used only for the purpose of preventing unnecessary portions from being colored.

Examples of the desensitizing agent that can be used in the present invention include the following specific examples. Quaternary ammonium salts such as dodecyltrimethylammonium chloride and octadecylammonium chloride;
High molecular weight amines such as dodecylamine; 2,4
Substituted oxazoline such as 4-trimethyl-2-oxazoline; Reaction product of alkylene oxide with diamine or polyamine derivative having cyclic structure in molecule such as xylylenediamine and N-aminopropylpiperidine; polyoxyethylene alkylamine, polyoxy Ethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyethylene glycol, polypropylene glycol, polyoxypropylene alkyl amine,
Examples thereof include polymers having a glutamic acid-γ-alkyl ester residue, spiroacetal-based diamines, N- (aminoalkyl) -lactams, and glycidyl ether adducts of amines. Among them, as the desensitizing agent of the present invention, ammonia and a compound obtained by adding an alkylene oxide having 3 or more carbon atoms to an amine compound are particularly effective.

The desensitizing agent capsule according to the present invention is obtained by microencapsulating the desensitizing agent as described above, and the encapsulating method, the encapsulating agent, etc. are all the methods and materials for encapsulating the color former described above. Can be applied.

The main components constituting the decolorizing layer of the present invention are a desensitizer capsule or a desensitizer and a binder. Among them, the binder can be selected from the following aqueous polymers used in the aqueous intermediate layer in consideration of the dispersibility and stability of the desensitizer capsule or the desensitizer. Further, an organic pigment or an inorganic pigment may be contained in the decoloring layer in consideration of printability and abrasion resistance.

An aqueous intermediate layer may be provided between the self-coloring pressure-sensitive recording layer and the erasing layer for the purpose of controlling the penetration of the desensitizer into the self-coloring pressure-sensitive recording layer. Examples of the aqueous polymer that can be used in the aqueous intermediate layer of the present invention include the following substances. As natural and semi-synthetic polymers, modified starch compounds such as starch, oxidized starch, etherified starch, dialdehyde starch, esterified starch, alginic acid compounds such as sodium alginate and propylene glycol alginate, casein, gelatin, pullulan , Dextran, chitin, chitosan, gum latex, gum arabic, funori, natural gum, modified cellulose compounds such as dextrin, methyl cellulose, ethyl cellulose, hydroxy cellulose, carboxymethyl cellulose and the like. As the synthetic polymer, completely saponified or partially saponified polyvinyl alcohol, acetoacetylated polyvinyl alcohol, esterification products of polyvinyl alcohol and polycarboxylic acid, carboxy-modified polyvinyl alcohol, sulfonic acid-modified polyvinyl alcohol, olefin-modified Modified polyvinyl alcohol compounds such as polyvinyl alcohol, nitrile modified polyvinyl alcohol, amide modified polyvinyl alcohol, pyrrolidone modified polyvinyl alcohol, polyethylene glycol, polyacrylic acid amide, polyacrylic acid, ammonium polyacrylate, sodium polyacrylate, etc. Polyacrylic acid compound, polyvinylpyrrolidone, polyethyleneimine, polyvinyl ether, polymaleic acid copolymer, polyacrylamide, Such as soluble alkyd resins. Also, a styrene / maleic anhydride copolymer,
A synthetic polymer such as styrene / butadiene copolymer, butadiene / methacrylate copolymer, or acrylonitrile / butadiene / acrylic acid latex can be used as an emulsion in which water is dispersed instead of the aqueous polymer solution. As the aqueous polymer, the above polymers may be used alone or in the form of a mixed aqueous solution, and if necessary, a defoaming agent, a dispersant and the like may be used in combination.

The coating amount of the aqueous intermediate layer varies depending on whether the decolorizing layer is formed by the desensitizing agent or the desensitizing capsule, and is not limited, but preferably 1 to 10 g.
Within the range of / m ² . When the coating amount is smaller than this range, the aqueous intermediate layer becomes uneven and the decoloring time may become non-uniform, and when it is larger than this range, the pressure-sensitive self-coloring property may be deteriorated. It is also possible to include pigments in the aqueous interlayer.

The ink receiving layer for ink jet in the present invention (hereinafter, simply referred to as ink receiving layer) comprises a coating composition containing a pigment and a binder as main components, to which a dye fixing agent and a pigment dispersion are added as additives. Agents, thickeners, fluidity improvers, defoamers, foam suppressors, release agents, foaming agents, penetrants, colored dyes, colored pigments, optical brighteners, ultraviolet absorbers, antioxidants, preservatives It is also possible to appropriately add a anti-fungal agent, a water resistance agent, a wet paper strength enhancer, a dry paper strength enhancer and the like.

As the pigment used in the ink receiving layer,
One or more known white pigments can be used. For example, light calcium carbonate, heavy calcium carbonate, kaolin, talc, calcium sulfate, barium sulfate, titanium dioxide, zinc oxide, zinc sulfide, zinc carbonate, satin white, aluminum silicate, diatomaceous earth, calcium silicate,
White inorganic pigments such as magnesium silicate, synthetic amorphous silica, colloidal silica, colloidal alumina, pseudo-boehmite, aluminum hydroxide, alumina, lithopone, zeolite, hydrohaloysite, magnesium carbonate, magnesium hydroxide, styrene plastic pigment, acrylic Organic pigments such as plastic pigments, polyethylene, microcapsules, urea resins and melamine resins can be used.

The aqueous ink used for ink jet recording in the present invention is a recording liquid containing a colorant, a liquid medium, and other additives. Examples of the coloring agent include water-soluble dyes such as direct dyes, acid dyes, basic dyes, reactive dyes, and food dyes.

As the solvent of the aqueous ink, water and various water-soluble organic solvents such as methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, sec-butyl alcohol, tert-butyl alcohol, C1-C4 alkyl alcohols such as isobutyl alcohol; amides such as dimethylformamide and dimethylacetamide; ketones or ketone alcohols such as acetone and diacetone alcohol; ethers such as tetrahydrofuran and dioxane; polyethylene glycol, polypropylene glycol Polyalkylene glycols such as ethylene glycol, propylene glycol, butylene glycol, triethylene glycol, 1,2,6-hexanetriol, thiodiglycol Lumpur, hexylene glycol,
Alkylene glycols having 2 to 6 alkylene groups such as diethylene glycol; and lower alkyl ethers of polyhydric alcohols such as glycerin, ethylene glycol methyl ether, diethylene glycol methyl (or ethyl) ether, and triethylene glycol monomethyl ether. Among these many water-soluble organic solvents, polyhydric alcohols such as diethylene glycol, and lower alkyl ethers of polyhydric alcohols such as triethylene glycol monomethyl ether and triethylene glycol monoethyl ether are preferable. Other additives include, for example, a pH adjusting agent, a sequestering agent, an antifungal agent, a viscosity adjusting agent, a surface tension adjusting agent, a wetting agent, a surfactant, and a rust preventive agent.

In the present invention, the pigment coating layer for printing is a coating layer for improving printability corresponding to ordinary printing such as offset printing, flexographic printing and gravure printing. It can be used for printing with water-based or oil-based pens, and includes so-called slightly coated paper. The coating liquid for the pigment coating layer for printing is a liquid in which the pigment, binder, and other additives are dissolved or dispersed in water, and the concentration of the pigment, binder, and other additives is 10 to 70% by weight. Say The mixing ratio of the pigment and the binder is generally 5 parts by weight or more, preferably 10 to 70 parts by weight, based on 100 parts by weight of the pigment.

The pigment used in the pigment coating layer for printing used in the present invention includes kaolin, clay, calcium carbonate, satin white, titanium oxide, aluminum hydroxide, zinc oxide, barium sulfate, calcium sulfate, silica, activated clay, Examples include rakes and plastic pigments.

In the present invention, the coating amount of the printing pigment coating layer is 1 g / m ² or more, preferably 3 to 3 on a dry weight basis.
30 g / m ² is suitable. If the coating amount of the printing pigment coating layer is less than this, good printability is not shown, and there is no point in providing the printing pigment coating layer, and if it is more than this, it does not contribute to improvement of printability.

In the magnetic recording layer of the present invention, magnetic powder is used as polyester resin, vinyl chloride resin, polyurethane resin, vinyl chloride / vinyl acetate copolymer resin, styrene / butadiene copolymer resin, polyacrylic ester resin, epoxy resin. Dispersed uniformly in a binder such as, plasticizer, rubber, dispersant, antistatic agent, pigment, etc. are added according to the purpose,
It is formed by applying or printing the obtained coating material on a substrate. As magnetic powder, γ-Fe ₂ O ₃ , Fe ₃ O ₄ ,
γ-Fe ₂ O ₃ and Fe ₂ O ₄ mixed crystal, Co-containing Fe ₂ O ₄ ,
Examples thereof include Ba ferrite and Sr ferrite. The coercive force is 1500 to 500 in order to prevent the trouble that the magnetically recorded information is erased by an ordinary permanent magnet.
0 Oersted Ba ferrite, Sr ferrite and the like are preferable.

It is also possible to provide a protective layer on the magnetic recording layer. Specific examples of the protective resin include grain starch, pregelatinized starch, oxidized starch, etherified starch, gelatin, casein, collagen, proteins such as viscose, methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose. Cellulose such as, agar, sodium alginate, polysaccharides such as gum arabic, polyvinyl alcohol, polyvinylpyridone, polyacrylic acid,
Examples thereof include water-soluble binders of polyacrylamide and maleic acid copolymers, styrene-butadiene-based, acrylonitrile-butadiene-based methylmethacrylate-butadiene-based, acrylic ester, vinyl acetate-based latex emulsion binders and carboxy-modified products thereof. It is also possible to disperse a pigment in the protective layer to form a hiding layer.

The pigment for the concealing layer is known, and specifically, for example, carbonates, oxides, hydroxides, sulfates and natural silica of clay such as aluminum, zinc, magnesium, barium, calcium and titanium, and clay. , Zeolite,
One or more of inorganic white pigments containing clays such as kaolin and calcined kaolin, and organic white pigments containing copolymers such as synthetic silica, styrene resin, melamine resin, acrylic resin and urea resin are used. . The protective layer or hiding layer coating solution is mixed with a dispersant, an antiseptic agent, an antifoaming agent and a dusting inhibitor, if desired, and then applied by a method such as air knife coating, curtain coating, roll coating or blade coating. An anchor layer may be provided between the magnetic recording layer and the protective layer to improve adhesion. Further, it is possible to provide a decoloring type self-coloring pressure-sensitive recording layer on the magnetic recording layer.

A lubricant, an abrasive, a rust preventive, a dispersant, a thickener and the like may be added to the magnetic composition of the present invention. In particular, the lubricant includes saturated and unsaturated higher fatty acids, fatty acid esters, higher fatty acid amides, higher alcohols, silicone oils, mineral oils, fluorine compounds, and the like, which may be added during the preparation of the magnetic material composition, or It may be coated or sprayed on the surface of the magnetic layer.

The magnetic layer coated on the support can be subjected to a treatment for orienting the magnetic substance in the layer, if necessary.
The orientation treatment is performed at about 500 to 3 at a right angle to the running direction of the support or at an angle to the running direction.
It can be carried out under an AC or DC magnetic field condition of about 000 Oerstod.

In the present invention, as binders used for forming the decolorizable type self-coloring pressure-sensitive recording layer, ink jet recording layer, heat sensitive recording layer, pigment coating layer for printing and magnetic recording layer, starch and hydroxyethyl cellulose are used. , Cellulose derivatives such as methylcellulose, ethylcellulose, carboxymethylcellulose, proteins such as casein and gelatin, oxidized starch, ester compound starch, etherified starch, oxidized starch, enzyme-modified starch and cold water soluble starch and casein obtained by flash-drying them. , Natural polymer compounds such as gelatin, soybean protein,
Polyvinyl alcohol, modified polyvinyl alcohol, silyl modified polyvinyl alcohol, polyvinylpyrrolidone, polyacrylic acid, sodium polyacrylate, acrylic acid amide / acrylic acid ester copolymer, acrylic acid amide / acrylic acid ester / methacrylic acid terpolymer Acrylic ester and methacrylic acid polymer or copolymer, acrylic acid and methacrylic acid polymer or copolymer, acrylic polymer latex, styrene / maleic anhydride copolymer alkali salt,
Latex, polyacrylamide, styrene / maleic anhydride copolymer, vinyl acetate / acrylic, vinyl acetate / butyl acrylate copolymer, maleic anhydride resin, styrene-butadiene copolymer, methylmethacrylate-butadiene copolymer, etc. Water-soluble synthetic polymer compounds such as conjugated diene copolymer latex, isobutene / maleic anhydride copolymer, latexes, water-soluble adhesive resin such as alkali salt of ethylene / maleic anhydride copolymer, ethylene vinyl acetate Vinyl-based polymer latex such as copolymers, or functional group-modified polymer latex with functional group-containing monomer such as carboxyl group of these various polymers, thermosetting synthetic resin system such as melamine resin, urea resin, etc. Water-based adhesive, polyvinyl acetate, polyurethane, polyacrylic ester, Polymethyl methacrylate, unsaturated polyester resin, vinyl chloride - vinyl acetate copolymer, polyvinyl butyral, synthetic resin adhesives such as alkyd resins, styrene / butadiene copolymers, acrylonitrile / butadiene copolymer, methyl acrylate /
Butadiene copolymer, acrylonitrile / butadiene /
Examples thereof include latexes of acrylic acid copolymers, ethylene / vinyl acetate copolymers and the like, and they are used in one kind or more. In addition, if necessary, a thickener, a water retention agent, a water resistance agent,
Various auxiliaries such as colorants, which are mixed with usual pigments for coated paper, can be appropriately used.

The adhesive layer of the recording sheet of the present invention is provided with an adhesive on the release agent coated surface of the release paper, and the adhesive surface and the self-coloring pressure-sensitive recording layer of the support of the recording sheet are not provided. A method of stacking the surfaces and press-bonding them with a press roll or the like is generally performed, but the recording sheet may be first coated with an adhesive and then bonded to a release paper. As the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer, a rubber-based or acrylic resin-based pressure-sensitive adhesive can be used. The main rubber-based raw material is natural rubber or styrene-butadiene rubber. In natural rubber, a rosin-based resin and a plasticizer are added, and normally hexane is used as a solvent for coating. When styrene-butadiene rubber is used as the main raw material, it is melted before coating. The acrylic resin system is produced by polymerizing acrylic monomers such as 2-ethylhexyl acrylate, butyl acrylate, ethyl acrylate, acrylic acid and β-hydroxyethyl acrylate. Depending on the method of polymerization, an organic solvent such as ethyl acetate or toluene may be used, or an emulsion type polymerized while emulsifying in water with a surfactant may be used.

In the present invention, a self-coloring pressure-sensitive recording layer, an ink jet layer, a heat-sensitive recording layer, a pigment coating layer for printing, a magnetic recording layer, an adhesive layer, etc. may be coated by a gravure coater, a gravure offset coater or a bar. Coater, roll coater, air knife coater, U comma coater, AKKU coater, smoothing coater, micro gravure coater, reverse roll coater, 4
Book or 5 roll roll coater, curtain coater, blade coater, dip coater, drop curtain coater, slide coater, lip coater, die coater, squeeze coater, short dwell coater, size press, sprayer, etc. Appropriate equipment can be used on-machine or off-machine. Further, after coating or impregnation of each layer,
It may be finished by using a calendar such as a machine calendar, a gloss calendar, a TG calendar, a super calendar, a soft calendar or brushing. Also,
In some cases, printing methods such as offset and silk screen are also used.

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

The decolorizable self-coloring pressure-sensitive recording sheet of the present invention is used as a series of copying sheets in combination with other pressure-sensitive recording sheets, back carbon copying sheet, adhesive sheet, printing sheet, transparent film and the like. it can. There is no problem with processing a part or all of the decolorizable self-coloring pressure-sensitive recording sheet of the present invention such as die cutting, separating a part of the support, perforation, and feeding holes for a printer. .

[0075]

In the decoloring type self-coloring pressure-sensitive recording sheet of the present invention, it is possible to develop the color of the self-coloring pressure-sensitive recording layer by performing pressure printing, and the color development verifies the authenticity of the recording sheet. Not only can it be confirmed, but since the color-developed portion is erased when the set time elapses, the authenticity of the recording sheet can also be checked by checking this process. Furthermore, since the color-developed portion is erased within a set time after checking the authenticity, it is not unsightly to use for a gift certificate or the like, and has a high commercial value. In addition, since the outermost surface of the recording sheet is a decoloring layer, it has high abrasion resistance and is easy to handle without developing color by simple rubbing.

[0076]

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.

<Preparation Example 1: Self-coloring pressure-sensitive coating liquid> Preparation of color-forming agent capsules: Color-forming agent-containing microcapsules used for pressure-sensitive recording were prepared as follows. First, 20 parts of crystal violet lactone is added to Hisol SAS
It was heated and dissolved in 90 parts of N-296 (manufactured by Nippon Petrochemical Co., Ltd.) to obtain an internal phase oil. 10 parts melamine and 37% formalin 25
Parts were heated together with 100 parts of water to obtain a melamine-formalin initial polycondensate. Next, the internal phase oil was emulsified in 150 parts of a 6% aqueous solution of styrene / maleic anhydride copolymer, and the above-mentioned melamine-formalin polycondensate was added to this emulsion, and the liquid temperature was raised to 70 ° C. for 3 hours. By holding, a microcapsule dispersion liquid containing a coloring agent having a melamine-formalin resin film was obtained. The average particle size of the obtained microcapsules was about 6 μm.

The coating material for the self-coloring pressure-sensitive recording layer was prepared by the following formulation. Microcapsules containing color former 150 parts Developer (Sumitomo Durez PR26298) 80 parts Starch particles 200 parts Kaolin clay 100 parts Oxidized starch 100 parts Calcium carbonate 120 parts

<Preparation Example 2: Preparation of desensitizing capsule coating liquid>
To 40 parts of propylene oxide adduct of ethylenediamine (average molecular weight 4100), 17 parts of rosin-modified phenol resin (Tamanol T135 manufactured by Arakawa Chemical Industry Co., Ltd.) was added, and 1
It melt | dissolved at 50 degreeC and it was set as the desensitizer internal phase oil. 10 parts of melamine and 25 parts of 37% formalin were heated together with 100 parts of water to obtain a melamine-formalin initial polycondensate. Then, the desensitizer internal phase oil is emulsified in 150 parts of a 6% styrene / maleic anhydride copolymer aqueous solution, and the above melamine-formalin polycondensate is added to this emulsion to adjust the liquid temperature to 70.
The temperature was maintained at 3 ° C. for 3 hours to obtain a microcapsule dispersion liquid (desensitizer capsule coating liquid) containing a desensitizer having a melamine-formalin resin film. The average particle size of the obtained microcapsules was about 6 μm.

<Preparation Example 3: Preparation of desensitizing agent coating liquid> As a desensitizing agent, 40 parts of a propylene oxide adduct of ethylenediamine (average molecular weight 4100) and 40 parts of calcium carbonate (manufactured by Shiraishi Calcium, Softon 2200) are used as surfactants. Was added and dispersed in 200 parts of water. The above desensitizer dispersion was added to 150 parts of a 6% aqueous polyvinyl alcohol solution and stirred to obtain a desensitizer coating liquid.

<Preparation Example 4: Preparation of coating liquid for intermediate layer> A 10% by weight solution of polyvinyl alcohol (NM-11) was used as an aqueous polymer forming an aqueous intermediate layer, and 5% by weight of silica gel was dispersed as a pigment. It was used as the intermediate layer coating liquid.

Example 1-A As a support, a commercially available high-quality paper (Diafoam 70 kg, manufactured by Mitsubishi Paper Mills) was coated with the self-coloring pressure-sensitive coating solution obtained in Preparation Example 1 to a coating amount of 7 g / m ^2. After coating, a self-coloring pressure-sensitive recording layer was provided. The desensitizing capsule coating solution obtained in Preparation Example 2 was applied thereon at a coating amount of 5 g / m ² to provide a decoloring layer with desensitizing capsules. Pressure sensitive sheet A is used.

Example 1-B As a support, commercially available high-quality paper (Diafoam 70 kg, manufactured by Mitsubishi Paper Mills) was coated with the self-coloring pressure-sensitive coating solution obtained in Preparation Example 1 to a coating amount of 7 g / m ^2. After coating, a self-coloring pressure-sensitive recording layer was provided. The intermediate layer coating liquid obtained in Preparation Example 4 was applied thereon with a coating amount of 3 g / m ² to form an aqueous intermediate layer. On top of that, 5 g of the desensitizing capsule coating solution obtained in Preparation Example 2 was added.
A coating amount of m ² was applied to provide a decoloring layer by a desensitizer capsule. This is pressure-sensitive sheet B.

Example 1-C As a support, a commercially available high-quality paper (Diafoam 70 kg, manufactured by Mitsubishi Paper Mills) was coated with the self-coloring pressure-sensitive coating solution obtained in Preparation Example 1 to a coating amount of 7 g / m ^2. After coating, a self-coloring pressure-sensitive recording layer was provided. The desensitizer coating solution obtained in Preparation Example 3 was applied thereon at a coating amount of 5 g / m ^{2 to form} a desensitizing layer. This is pressure sensitive sheet C.

Example 1-D As a support, commercially available high-quality paper (Diafoam 70 kg, manufactured by Mitsubishi Paper Mills) was coated with the self-coloring pressure-sensitive coating solution obtained in Preparation Example 1 to a coating amount of 7 g / m ^2. After coating, a self-coloring pressure-sensitive recording layer was provided. The intermediate layer coating liquid obtained in Preparation Example 4 was applied thereon with a coating amount of 3 g / m ² to form an aqueous intermediate layer. Further, the desensitizing agent coating liquid obtained in Preparation Example 3 was applied thereon at a coating amount of 5 g / m ² to provide a desensitizing layer. Pressure-sensitive sheet D
And

Comparative Example 1 As a support having a self-coloring pressure-sensitive recording layer, a commercially available high-quality paper (manufactured by Mitsubishi Paper Mills, Diafoam 70K) was coated with the self-coloring pressure-sensitive recording layer having the composition described in Preparation Example 1. Quantity 7
The self-coloring pressure-sensitive recording sheet coated so as to have g / m ² was used as it was.

Comparative Example 2 On the self-coloring pressure-sensitive recording sheet obtained in Comparative Example 1, the entire surface was printed with a commercially available desensitizing ink (desensitizing ink for NCR offset, manufactured by Mitsubishi Paper Mills) and cured by UV to desensitize it. A self-coloring recording sheet was obtained.

Comparative Example 3 As a support having a color-developing / decoloring type self-coloring pressure-sensitive recording layer, commercially available high-quality paper (manufactured by Mitsubishi Paper Mill, Diafoam 7
0K), a coloring / decoloring self-coloring pressure-sensitive recording layer having the composition described in Preparation Example 5 below was applied at a coating amount of 7 g / m ² to form a coloring / decoloring self-coloring pressure-sensitive recording layer. A recording sheet was obtained.

<Adjustment Example 5: Coloring / decoloring type self-coloring pressure-sensitive recording coating liquid> A coating material for the coloring / decoloring type self-coloring pressure-sensitive recording layer was prepared according to the following formulation. Microcapsules containing color former (Preparation example 1) 150 parts Microcapsules containing desensitizer (Preparation example 2) 120 parts Developer (PR26298 manufactured by Sumitomo Durez Co., Ltd.) 80 parts Starch particles 300 parts Kaolin clay 120 parts Oxidation Starch 120 parts Calcium carbonate 140 parts

Example 2-A An air knife coater was prepared by using a commercially available high-quality paper (Mitsubishi Paper Mill, Diafoam 70 kg) as a support and the ink-receiving layer composition shown in Preparation Example 6 below as an ink-receiving layer composition. To a dry coating amount of 5 g / m ^2, and then apply the self-coloring pressure-sensitive coating liquid obtained in Preparation Example 1 to the opposite surface so that the coating amount is 7 g / m ^2. Then, a self-coloring pressure-sensitive recording layer was provided. The desensitizing capsule coating solution obtained in Preparation Example 2 was applied thereon at a coating amount of 5 g / m ² to provide a decoloring layer with desensitizing capsules, and the desired inkjet / decoloring type self-coloring pressure-sensitive A recording sheet (A) was obtained.

<Preparation Example 6: Ink receiving layer coating liquid formulation> Synthetic amorphous silica (Fanseal X37B: manufactured by Tokuyama Soda Co., Ltd.) 100 parts Polyvinyl alcohol (PVA117: manufactured by Kuraray Co., Ltd.) 30 parts Cationic dye fixing agent ( 20 parts above was prepared to prepare a solid content concentration of 13%.

Example 2-B As a support, a commercially available high-quality paper (manufactured by Mitsubishi Paper Mills, Diafoam 70 kg) was dried with an air knife coater, using the ink-receiving layer composition shown in Preparation Example 6 as the ink-receiving layer composition. The coating amount was 5 g / m ^2, and then the self-color-developing pressure-sensitive coating liquid obtained in Preparation Example 1 was applied to the opposite surface so that the coating amount was 7 g / m ^2. A self-coloring pressure-sensitive recording layer was provided. On top of that, 3 g of the intermediate layer coating solution obtained in Preparation Example 4 was added.
A coating amount of m ² was applied to provide an aqueous intermediate layer. Further, the desensitizing capsule coating solution obtained in Preparation Example 2 was applied thereon at a coating amount of 5 g / m ² to provide a decoloring layer with desensitizing capsules, and the desired inkjet / decoloring self-coloring A pressure sensitive recording sheet (B) was obtained.

Example 2-C A commercially available high-quality paper (made by Mitsubishi Paper Mills, Diafoam 70 kg) was used as a support, and the ink-receiving layer coating liquid shown in Preparation Example 6 was used as the ink-receiving layer composition. The coating amount was 5 g / m ^2, and then the self-color-developing pressure-sensitive coating liquid obtained in Preparation Example 1 was applied to the opposite surface so that the coating amount was 7 g / m ^2. A self-coloring pressure-sensitive recording layer was provided. On top of that, 5 g of the desensitizer coating solution obtained in Preparation Example 3 was added.
A desired inkjet / decoloring type self-coloring pressure-sensitive recording sheet (C) was obtained by coating with a coating amount of m ² and providing a decoloring layer with a desensitizer.

Example 2-D A commercially available high-quality paper (Mitsubishi Paper Mill, Diafoam 70 kg) was used as a support, and the ink-receiving layer coating liquid shown in Preparation Example 6 was used as the ink-receiving layer composition, followed by drying with an air knife coater. The coating amount was 5 g / m ^2, and then the self-color-developing pressure-sensitive coating liquid obtained in Preparation Example 1 was applied to the opposite surface so that the coating amount was 7 g / m ^2. A self-coloring pressure-sensitive recording layer was provided. On top of that, 3 g of the intermediate layer coating solution obtained in Preparation Example 4 was added.
A coating amount of m ² was applied to provide an aqueous intermediate layer. Further, the desensitizing agent coating liquid obtained in Preparation Example 3 was applied thereon at a coating amount of 5 g / m ² to provide a decoloring layer with the desensitizing agent, and the desired inkjet / decoloring type self-coloring pressure sensitive A recording sheet (D) was obtained.

Comparative Example 4 As a support having an inkjet recording layer, a commercially available high-quality paper (manufactured by Mitsubishi Paper Mills, Diafoam 70K) was coated with an inkjet coating solution having the composition described in Preparation Example 6 to give a dry weight of 5 g.
An inkjet recording layer was formed by coating and drying so as to have an ink jet recording sheet thickness of / m ² .

Example 1-A to Example 1-D, Example 2-
The recording sheets obtained in A to Example 2-D and Comparative Examples 1 to 4 were evaluated by the following methods, and the results are shown in Table 1.

<Pressure Sensitive Color Development> Solid recording was carried out on the recording sheets obtained in Examples and Comparative Examples by using a dot impact printer without an ink ribbon. After printing, the optical density was measured using a Macbeth densitometer. In practical use, the optical density is 0.30 or more so that it can be visually confirmed whether it is true or false. If the optical density is less than 0.20, accurate confirmation is difficult. Optical density is 0.
When it is less than 15, it is difficult to understand the presence or absence of color development.

<Inkjet Suitability> Printing was performed using a commercially available inkjet printer (Epson MJ-700V2C). Immediately after printing, the printed surface was rubbed with a cloth to observe stains on the printed surface. 5 when the print is not dirty at all, 4 when the flow can be seen in a very small part of the print but cannot be understood without attention, 3 when the print flows but there is almost no effect on decoding, and most of the print flows and decode The ink jet aptitude was represented by 2 when it was not possible and 1 when the printing was not fixed at all. However, in the case of printing with an inkjet printer, if the unnecessary portion other than the inkjet printing is colored due to the rubbing of the paper feed roll or the paper feed gear, it means that the inkjet printer is not suitable and the inkjet coloring property is 0. It was judged by.

<Counterfeiting Prevention 1> Printing was carried out using a commercially available dot impact printer without an ink ribbon. Self-coloring property The pressure-sensitive recording layer develops color, and it can be confirmed that it is not a recording sheet such as coated paper, high-quality paper, inkjet recording paper, etc. The anti-counterfeiting property 1 is excellent, and it does not develop color and has no anti-counterfeiting property. Also, the anti-counterfeit property 1 was judged to be poor.

<Decoloring property> The time required for the optical density of the part colored in the pressure-sensitive coloring property test to decrease to 0.15 was measured. When double-checking the authenticity of the recording sheet, it is preferable that the part which has been once colored for authenticity check can be confirmed for the next 2 to 5 days (optical density of 0.15 or more). If the color is erased too quickly, it will be inconvenient because the color will have to be re-developed during the second authenticity check. If the color is erased too slowly, the advantage of erasing cannot be utilized as with mere self-coloring pressure-sensitive recording paper. . In the color erasing test, when the optical density did not decrease to 0.15 even after one month, it was judged as no color erasing.

To determine the scratch resistance of the recording sheet, the color developing surfaces of the two recording sheets are overlapped, a constant weight (0.2 kg / cm ² ) is applied to the upper back surface, and a distance of 80 cm is rubbed against the upper surface. The color density of the recording paper of No. 1 was measured using a Macbeth densitometer. The increase in optical density is 0.
When it was 02 points or less, the abrasion resistance was excellent, when it was 0.04 points or less, the abrasion resistance was normal, and when it was 0.05 points or more, the abrasion resistance was inferior.

[0102]

[Table 1]

Example 3-A, Example 3-B, Example 3-
C, Example 3-D Dry coating with an air knife coater using the heat-sensitive coating liquid shown in the following Preparation Example 7 as a heat-sensitive recording layer on the opposite surface of each of the pressure-sensitive sheets A to D obtained in Example 1. Work load 5 g / m ²
To obtain the desired heat-sensitive / decoloring type self-coloring pressure-sensitive recording sheets (A to D).

<Preparation Example 7: Preparation of heat-sensitive coating liquid> The heat-sensitive coating liquid constituting the heat-sensitive recording layer was prepared as follows. Each of the following blends was sand milled to give an average particle size of about 1
It was pulverized and dispersed until the particle size became μm to prepare <A liquid> and <B liquid>.

<Solution A> 3- (N-methyl-N-cyclohexyl) amino-6-methyl-7-anilinofluorane 40 parts 10% aqueous polyvinyl alcohol solution 20 parts Water 40 parts <Solution B> Bisphenol A 50 parts 2-benzyloxynaphthalene 50 parts 10% aqueous polyvinyl alcohol solution 50 parts water 100 parts

Then, using the prepared <A solution> and <B solution>, a heat-sensitive coating solution was prepared with the following formulation. <Solution A> 50 parts <Solution B> 250 parts Zinc stearate (40% dispersion) 25 parts 10% aqueous solution of polyvinyl alcohol 216 parts Calcium carbonate 50 parts Water 417 parts

Comparative Example 5 As a support having a heat-sensitive recording layer, a commercially available high-quality paper (manufactured by Mitsubishi Paper Mills, Diafoam 70K) was coated with a heat-sensitive coating solution having the composition described in Preparation Example 7 to give a dry weight of 5 g / m ^2. Thus, the thermosensitive recording layer was provided by coating and drying to obtain a thermosensitive recording sheet.

The recording sheets obtained in Examples 3-A to 3-D and Comparative Example 5 were evaluated by the following methods in addition to the above pressure-sensitive color development and decoloring test, and the results are shown. The results are shown in Table 2.

<Thermosensitive color development> Solid printing was performed using a commercially available thermosensitive word processor. After printing, the optical density was measured using a Macbeth densitometer. When used practically, the optical density at which even small letters can be sufficiently read is 0.50 or more, and the thermosensitive coloring property was excellent. If the optical density is less than 0.40, accurate reading is difficult and the thermosensitive coloring property is poor. The thermosensitive color development was judged to be normal between the two. However, if you do not develop color at all when printing with a thermal word processor, and if unnecessary parts other than thermal printing print due to rubbing of the paper feed roll or thermal head, it is not suitable for thermal printer, The thermosensitive coloring property was judged as bad.

<Counterfeiting prevention property 2> On the back surface of the recording sheet on which heat-sensitive recording was performed using a commercially available heat-sensitive word processor,
Printing was performed using a dot impact printer that was not equipped with an ink ribbon. Those for which this layer develops color and can be confirmed as not being a mere heat-sensitive recording sheet were judged to have excellent anti-counterfeit property 2, and those for which no color developed and no anti-counterfeit property were judged to have poor anti-counterfeit property 2.

[0111]

[Table 2]

Example 4-A As a support, a commercially available high-quality paper (made by Mitsubishi Paper Mills, Diafoam 70 kg) was coated with a blade coater so that the absolute dry coating amount was 15 g / m ² . A coating solution having a solid content concentration of 53% was applied as a pigment coating layer for printing and dried, and the self-coloring pressure-sensitive coating solution obtained in Preparation Example 1 was applied to the opposite surface at a coating amount of 7 g / m 2. ^It was coated so as to have a thickness of ² to provide a self-coloring pressure-sensitive recording layer. The desensitizing capsule coating liquid obtained in Preparation Example 2 was applied thereon at a coating amount of 5 g / m ² to provide a decoloring layer with desensitizing capsules, and the desired printing / decoloring self-coloring pressure-sensitive A recording sheet (A) was obtained.

<Preparation Example 8: Pigment coating liquid formulation for printing> Commercially available heavy calcium carbonate (Carbital 90) 10 parts Commercially available primary kaolin (Ultra White 90) 30 parts Commercially available secondary kaolin (Caobrite) 20 parts Commercially available cube Light calcium carbonate (Brilliant 15) 10 parts Commercial aragonite type calcium carbonate (HGA) 30 parts Commercial polyacrylic acid-based dispersant 0.2 parts Commercial phosphate esterified starch 2 parts Styrene-butadiene latex 16 parts

Example 4-B A blend of Preparation Example 8 was prepared by using a blade coater on a commercially available high-quality paper (Diafoam 70 kg, manufactured by Mitsubishi Paper Mills) as a support so that the absolute dry coating amount was 15 g / m ² . A coating liquid having a solid content concentration of 53% was applied as a pigment coating layer for printing and dried, and the self-coloring pressure-sensitive coating liquid obtained in Preparation Example 1 was applied to the opposite surface to a coating amount of 7 g / m ² . And a self-coloring pressure-sensitive recording layer. The intermediate layer coating liquid obtained in Preparation Example 4 was applied thereon with a coating amount of 3 g / m ² to form an aqueous intermediate layer. On top of that, 5 g of the desensitizing capsule coating liquid obtained in Preparation Example 2 was added.
A coating / bleaching type self-coloring pressure-sensitive recording sheet (B) was obtained by coating with a coating amount of / m ² and providing a decoloring layer with a desensitizer capsule.

Example 4-C A commercially available high-quality paper (made by Mitsubishi Paper Mills, Diafoam 70 kg) was used as a support with a blade coater so that the absolute dry coating amount was 15 g / m ² . A coating solution having a solid content concentration of 53% was applied as a pigment coating layer for printing and dried, and the self-coloring pressure-sensitive coating solution obtained in Preparation Example 1 was applied to the opposite surface at a coating amount of 7 g / m 2. ^It was coated so as to have a thickness of ² to provide a self-coloring pressure-sensitive recording layer. The desensitizing coating solution obtained in Preparation Example 3 was applied thereon at a coating amount of 5 g / m ² to provide a decolorizing layer with the desensitizing agent, and a desired printing / decoloring type self-coloring pressure-sensitive recording sheet. (C) was obtained.

Example 4-D A blend of Preparation Example 8 was prepared by using a blade coater on a commercially available high-quality paper (made by Mitsubishi Paper Mills, diamond foam 70 kg) so that the absolute dry coating amount was 15 g / m ² . A coating liquid having a solid content concentration of 53% was applied as a pigment coating layer for printing and dried, and the self-coloring pressure-sensitive coating liquid obtained in Preparation Example 1 was applied to the opposite surface to a coating amount of 7 g / m ² . And a self-coloring pressure-sensitive recording layer. The intermediate layer coating liquid obtained in Preparation Example 4 was applied thereon with a coating amount of 3 g / m ² to form an aqueous intermediate layer. Further, the desensitizer coating solution obtained in Preparation Example 2 was applied thereon at a coating amount of 5 g / m ² to provide a decoloring layer with the desensitizing agent, and the desired printing / decoloring type self-coloring pressure-sensitive recording A sheet (D) was obtained.

Comparative Example 6 As a support having a pigment coating layer for printing, a commercially available high-quality paper (manufactured by Mitsubishi Paper Mills, Diafoam 70K) was used, and Preparation Example 8 was prepared.
The dry weight of the pigment coating liquid for printing having the described composition is 15 g / m ²
Coated and dried to provide a pigment coating layer for printing,
I got a printing paper.

The recording sheets obtained in Examples 4-A to 4-D and Comparative Examples 1 and 6 were evaluated by the following methods in addition to the above-mentioned pressure-sensitive color development and decoloring test. The results were shown in Table 3.

<Printability> 4 using an offset printing machine
Color printing was performed. Immediately after printing, the printed surface was rubbed with a cloth to observe stains on the printed surface. 5 when the print is not dirty at all, 4 when the dirt is seen on a very small part of the print surface but cannot be seen without attention, 3 when the print surface is dirty but hardly affects the decoding, and most of the print is dirty The printability is represented by 2 when it cannot be decoded and 1 when it cannot be printed.

<Anti-counterfeiting property 3> Printing was performed on the back surface of a recording sheet on which four-color printing was performed using an offset printing machine, using a dot impact printer not equipped with an ink ribbon. Those for which this layer developed a color and could be confirmed as a simple printed paper were judged to have excellent anti-counterfeit property 3, and those for which no color developed and no anti-counterfeit property were judged to have poor anti-counterfeit property 3.

[0121]

[Table 3]

Example 5-A A magnetic recording layer coating liquid prepared in Preparation Example 9 below was used as a support at a rate of 30 g / m ² using a gravure coater on a commercially available high-quality paper (made by Mitsubishi Paper Mills, Diafoam 90 Kg). Coating, dry after magnetic field orientation, and lightly super calender finish to provide a magnetic recording layer, and apply the self-coloring pressure-sensitive coating liquid obtained in Preparation Example 1 on the opposite surface to a coating amount of 7 g / m ^2. To provide a self-coloring pressure-sensitive recording layer. The desensitizing capsule coating solution obtained in Preparation Example 2 was applied thereon at a coating amount of 5 g / m ² to provide an erasing layer with the desensitizing capsules, and the desired magnetic recording printing / erasing type self-coloring A pressure sensitive recording sheet (A) was obtained.

<Preparation Example 9: Coating liquid for magnetic recording layer> A mixture having the following composition was dispersed in a ball mill to prepare a coating liquid for magnetic recording layer. Ba-ferrite (coercive force 2700 oersted) 100 parts Styrene-butadiene latex (manufactured by Japan Synthetic Rubber Co., Ltd.) 30 parts Water 200 parts

Example 5-B A magnetic recording layer coating solution prepared in Preparation Example 9 was applied at a rate of 30 g / m ² onto a commercially available high-quality paper (Mitsubishi Foam, Diafoam 90 Kg) as a support using a gravure coater. Coating, magnetic field orientation, drying, mild supercalendering to provide a magnetic recording layer, and the self-color-developing pressure-sensitive coating liquid obtained in Preparation Example 1 is applied to the opposite surface to a coating amount of 7 g / m ^2. Then, a self-coloring pressure-sensitive recording layer was provided. Adjustment example 4
The intermediate layer coating solution obtained in 1. was applied at a coating amount of 3 g / m ² to form an aqueous intermediate layer. Furthermore, the desensitizing capsule coating solution obtained in Preparation Example 2 was applied thereon at a coating amount of 5 g / m ² to provide an erasing layer with the desensitizing capsule, and the desired magnetic recording printing / erasing type self A color forming pressure-sensitive recording sheet (B) was obtained.

Example 5-C A magnetic recording layer coating solution prepared in Preparation Example 9 was applied at a rate of 30 g / m ^{2 to} a commercially available high-quality paper (Mitsubishi Form, Diafoam 90 Kg) as a support using a gravure coater. Coating, magnetic field orientation, drying, mild supercalendering to provide a magnetic recording layer, and the self-color-developing pressure-sensitive coating liquid obtained in Preparation Example 1 is applied to the opposite surface to a coating amount of 7 g / m ^2. Then, a self-coloring pressure-sensitive recording layer was provided. Adjustment example 3
The desensitizing coating solution obtained in Step 5 was applied at a coating amount of 5 g / m ² to provide a decolorizing layer with a desensitizing agent, and the desired magnetic recording / decoloring self-coloring pressure-sensitive recording sheet (C) was obtained. Obtained.

Example 5-D A magnetic recording layer coating solution prepared in Preparation Example 9 was applied at a rate of 30 g / m ^{2 to} a commercially available high-quality paper (Mitsubishi Paper Manufacturing, Diafoam 90 Kg) as a support using a gravure coater. After magnetic field orientation, magnetic field is dried and super calendered to provide a magnetic recording layer, and the self-color-developing pressure-sensitive coating solution obtained in Preparation Example 1 is applied on the opposite surface to a coating amount of 7 g / m ^2. Then, a self-coloring pressure-sensitive recording layer was provided. Adjustment example 4
The intermediate layer coating solution obtained in 1. was applied at a coating amount of 3 g / m ² to form an aqueous intermediate layer. Further, the desensitizing agent coating liquid obtained in Preparation Example 3 was applied thereon at a coating amount of 5 g / m ² to provide a decolorizing layer with the desensitizing agent. A pressure sensitive recording sheet (D) was obtained.

Comparative Example 7 As a support having a magnetic recording layer, commercially available wood free paper (manufactured by Mitsubishi Paper Mills, Diafoam 90 Kg) was coated with a magnetic recording layer coating solution having the composition described in Preparation Example 9 at a dry weight of 30 g / m ^2. The coating was carried out in the following ratio, the magnetic field orientation was carried out, followed by drying and supercalendering to provide a magnetic recording layer to obtain a magnetic recording sheet.

Comparative Example 8 The magnetic recording sheet obtained in Comparative Example 7 was coated with the self-coloring pressure-sensitive coating solution described in Preparation Example 1 at a rate of 7 g / m ² to provide a self-coloring pressure-sensitive recording layer, and a magnetic layer was provided. A recording / self-coloring pressure-sensitive recording sheet was obtained.

Example 1-A, Example 5-A to Example 5-
The recording sheets obtained in D and Comparative Examples 1, 7, and 8 were evaluated by the following methods in addition to the above pressure-sensitive color development and decoloring test, and the results are shown in Table 4.

<Squareness Ratio> As a test of magnetic recording characteristics, the samples obtained in Examples and Comparative Examples were cut into 5 mm squares, and the maximum magnetization (Mm) and the residual magnetization (Mr) were measured using a vibrating magnetometer. The square ratio (Rs) of the sample was obtained by measurement and the following formula 1. The closer the squareness ratio is to 1, the more ideal the thermosensitive magnetic recording medium.

[0131]

## EQU1 ## Rs = Mr / Mm

<Repeatability 1> As a test of magnetic recording characteristics, the samples obtained in Examples and Comparative Examples were passed through a commercially available reader / writer device 100 times and the maximum magnetization ( The first value of Mm) and 1
The repetition characteristics were evaluated based on the ratio (percentage) of the value at the 00th time.

<Counterfeiting Prevention Property 4> In the examples, printing was carried out by an impact printer having no ink ribbon. After printing, magnetic information is written by a commercially available reader / writer, and it is possible to retain both magnetic information and information of the pressure-sensitive color development part, and it is possible to have a high degree of forgery prevention. Those that could be produced, or those that could retain only the pressure-sensitive color development information, were judged to have poor anti-counterfeiting properties 4.

[0134]

[Table 4]

Example 6-A, Example 6-B, Example 6-
C, Examples 6-D On the back surface (support side) of the pressure-sensitive sheets A to D obtained in Example 1, an adhesive layer (Ricabond AP manufactured by Chuo Rika Kogyo) was used.
-37) was provided so as to have a dry weight of 20 g / m ^2, and the pressure-sensitive adhesive layer was covered with a commercially available release paper to obtain decolorizable self-coloring pressure-sensitive recording labels (A to D).

Comparative Example 9 As a support having an adhesive layer, a commercially available high-quality paper (made by Mitsubishi Paper Mills, Diafoam 70K) was coated with an adhesive layer (made by Chuo Rika Kogyo, Ricabond AP-37) at a dry weight of 20 g / m ² . And the adhesive layer was covered with a commercially available release paper to give a label.

Comparative Example 10 On the non-coloring surface side of the self-coloring pressure-sensitive recording sheet obtained in Comparative Example 1-A, an adhesive layer (Ricabond AP manufactured by Chuo Rika Kogyo Co., Ltd.) was used.
-37) was provided so as to have a dry weight of 20 g / m ^2, and the adhesive layer was covered with a commercially available release paper to give a pressure-sensitive color developing label.

The labels obtained in Examples 6-A to 6-D and Comparative Examples 9 and 10 were tested by the following evaluation methods in addition to the above pressure-sensitive color development and decoloring test. The results are shown in Table 5.

<Adhesive Strength> The pressure-sensitive color-developing label or the release paper of the label obtained in Examples and Comparative Examples was peeled off and adhered to a stainless steel plate, and the adhesive strength was measured by Tensilon by 90 ° peeling. The adhesive strength required for the label is usually 100 gf / 25 mm or more.

<Counterfeiting Prevention Property 5> When the pressure-sensitive color-developing label or the release paper of the label obtained in Examples and Comparative Examples is peeled off and attached to an adherend, the label develops color by a light pressure-bonding force. It is not possible to make a duplicate of the label by color copying, etc., and since the authenticity can be judged while it is still attached to the adherend, anti-counterfeiting property 5 is excellent, the label does not develop color, and a similar label is duplicated. The case where there is no way to judge is judged to be inferior in anti-counterfeit property 5.

[0141]

[Table 5]

Evaluation: The color-erasable self-coloring pressure-sensitive recording sheet obtained in Example 1 is capable of developing color by applying pressure, as with a normal self-coloring pressure-sensitive recording sheet, and with the passage of time. The color is erased, and the colored part is not visible and is not unsightly. When performing a double check of the authenticity of a recording sheet, the color erasing time can be confirmed not only on the day of the color development for the authenticity check, but also for the next 2 to 5 days (optical density of 0.15 The above is preferable, and the decoloring property of the pressure-sensitive sheet of Example 1 is within an appropriate range and is easy to use. Further, compared with a normal self-coloring pressure-sensitive recording sheet, or as compared with a color-developing / decoloring self-coloring pressure-sensitive recording sheet, the abrasion resistance is good and it is easy to handle as a recording sheet.

The ink-jet / decoloring type self-coloring pressure-sensitive recording sheet obtained in Example 2 has ink-jet recording property and pressure-sensitive color forming property on the same sheet, and two types can be obtained by using both recording methods. Since a printing method is possible, and in particular, the pressure-sensitive color-developed portion can be erased after color development, the ink-jet recording can be used for information recording, and the pressure-sensitive recording can be complementarily used for anti-counterfeiting applications. In particular,
The amount of money, the date, the seat number, etc. are recorded by inkjet recording on the recording sheet of the present invention printed for a ticket. When the ticket is used, the pressure-sensitive layer is colored by pressing a part of the ticket, and it can be confirmed that the ticket is genuine. This color-developed portion disappears over time and becomes unsightly. Such authenticity determination cannot be performed when a simple inkjet paper is used for a ticket as in the comparative example. The same thing can be said for the mere self-coloring pressure-sensitive recording sheet of Comparative Example 2, and it is not possible to judge the authenticity by itself, and the inkjet recording aptitude is also absent. Therefore, the recording sheet of the present invention has an authenticity judgment property, that is, a forgery prevention property.

The heat-sensitive / color-erasable self-coloring pressure-sensitive recording sheet obtained in Example 3 has heat-sensitive recording property and pressure-sensitive color forming property on the same sheet, and two kinds of recording systems can be used. Since a printing method is possible, and in particular, the pressure-sensitive color-developed portion can be erased after color development, it is possible to use the heat-sensitive recording for information recording and complement the pressure-sensitive recording for anti-counterfeiting applications. Specifically, the amount of money, the date, the seat number, etc. are entered by thermal recording on the recording sheet of the present invention printed for a ticket. When the ticket is used, the pressure-sensitive layer is colored by pressing a part of the ticket, and it can be confirmed that the ticket is genuine. This color-developed portion disappears over time and becomes unsightly. When a thermal paper is simply used for a ticket as in the comparative example, such authenticity determination cannot be performed. The same thing can be said for the mere self-coloring pressure-sensitive recording sheet of the comparative example, and it is not possible to judge the authenticity by itself and it is not suitable for heat-sensitive recording. Therefore, the recording sheet of the present invention has an authenticity judgment property, that is, a forgery prevention property.

The printing / decoloring type self-coloring pressure-sensitive recording sheet obtained in Example 4 has printability and pressure-sensitive coloration on the same side, and two types of printing can be performed by using both recording methods. System is possible, and by enabling both printing and pressure-sensitive recording methods with one recording sheet, printing can be used as information recording, and pressure-sensitive recording can be used complementarily and used for counterfeit prevention applications and the like. . Specifically, in the recording sheet of the present invention in which the business name, amount, date, and forgery prevention microprinting, direct printing, fluorescent printing, etc. are printed for the ticket, when the ticket is used, By pressing the part, the pressure-sensitive layer is colored to confirm that the ticket is genuine. This color-developed portion disappears over time and becomes unsightly. When a printing paper having a simple printing layer is used as in the comparative example, such authenticity determination cannot be performed.

The magnetic recording / decoloring type self-coloring pressure-sensitive recording sheet in Example 5 is a pressure-sensitive recording sheet having a self-coloring property and can be used as a magnetic recording paper by a magnetic recording reader / writer. . Therefore, the authenticity of the recording sheet can be discriminated by using both the pressure-sensitive color recording and the magnetic recording (counterfeiting prevention property 4). This color-developed portion disappears over time and becomes unsightly. Obviously, such forgery prevention cannot be achieved only by magnetic recording paper and pressure-sensitive coloring paper.

The color-erasable self-coloring pressure-sensitive recording label obtained in Example 6 produces a copy of the label by color copying, etc., since the label develops color by light pressure bonding after the label is attached to the adherend. It is not possible, and it is possible to judge the authenticity while it is attached to the adherend, and the anti-counterfeit property is high (anti-counterfeit property 5). This color-developed portion disappears over time and becomes unsightly. This is not suitable for general label applications because it is impossible to confirm the color by a simple label, and the color is still developed only by the self-coloring pressure-sensitive recording sheet.

[0148]

INDUSTRIAL APPLICABILITY In a series of color-erasable self-coloring pressure-sensitive recording sheets of the present invention, ink jet recording, heat-sensitive recording,
Not only printing and magnetic recording are possible, but also by pressure printing, it is possible to develop the color of the self-coloring pressure sensitive recording layer. It can be used and is not unsightly with no trace of authenticity checking left behind. The optical density of the color-sensitive area for authenticity check is supposed to be double checked for authenticity, and the area for which color is once checked for authenticity is not only for the day, but for the next 2-5 days. The color is confirmed (optical density of 0.15 or more). The series of decolorizable self-coloring pressure-sensitive recording sheets of the present invention are difficult to forge because two recording systems can be used together, and can be used as anti-counterfeit paper.
As a result, it also helps prevent counterfeiting of products used with anti-counterfeit paper (for example, as a label). Even if a document or a ticket using the series of color-erasable self-coloring pressure-sensitive recording sheets of the present invention is forged, the forgery can be easily detected by, for example, pressure-sensitive coloring after inkjet recording, which has great industrial significance. It is a thing.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a decolorizable self-coloring pressure-sensitive recording sheet of the present invention.

FIG. 2 is a sectional view of an inkjet / decoloring type self-coloring pressure-sensitive recording sheet of the present invention.

FIG. 3 is a cross-sectional view of a heat-sensitive / decolorable self-coloring pressure-sensitive recording sheet of the present invention.

FIG. 4 is a cross-sectional view of a print / pressure-sensitive color developing label of the present invention.

FIG. 5 is a sectional view of a magnetic recording / pressure-sensitive color-developing recording sheet of the present invention.

FIG. 6 is a sectional view of the pressure-sensitive color-developing label of the present invention.

[Explanation of symbols]

1 Support 2 Self-Coloring Pressure-Sensitive Recording Layer 3 Coloring Agent Encapsulating Capsule 4 Developer 5 Desensitizer or Desensitizing Agent Encapsulating Capsule 6 Aqueous Intermediate Layer 7 Decoloring Layer 8 Decoloring Self-Coloring Pressure-Sensitive Recording Sheet 9 Inkjet Recording Layer 10 Inkjet / decolorizing self-coloring pressure-sensitive recording sheet 11 Thermal recording layer 12 Thermosensitive / decoloring self-coloring pressure-sensitive recording sheet 13 Printing pigment coating layer 14 Printing / decoloring self-coloring pressure-sensitive recording sheet 15 Magnetic Recording layer 16 Magnetic recording / erasable self-coloring pressure-sensitive recording sheet 17 Adhesive layer 18 Decoloring self-coloring pressure-sensitive recording label 19 Release paper 20 Release surface

Claims (8)

[Claims] 1. A self-coloring pressure-sensitive recording layer comprising a support, a color-developing agent, and / or a color-developing agent, which are microencapsulated and are laminated or mixed individually to form a single layer.
A decolorizing type self-coloring pressure-sensitive recording sheet obtained by sequentially laminating a decolorizing layer containing a desensitizing agent or a desensitizing capsule. 2. A self-coloring pressure-sensitive recording layer of a single layer in which at least one of a support, a color-developing agent and a color-developing agent is microencapsulated, and each is laminated or mixed individually.
A decoloring type self-coloring pressure-sensitive recording sheet obtained by sequentially laminating an aqueous intermediate layer and a decoloring layer containing a desensitizing agent or a desensitizing agent capsule. 3. A decolorizing layer and a self-coloring pressure-sensitive recording layer are provided on one side of a support, and an ink receiving layer for ink jet recording (hereinafter, simply ink receiving layer) is provided on the opposite side of the support. Inkjet / erasable self-coloring pressure-sensitive recording sheet. 4. A heat-sensitive / bleaching type self-coloring pressure-sensitive recording comprising a support having a decoloring layer and a self-coloring pressure-sensitive recording layer on one surface, and a heat-sensitive recording layer provided on the opposite surface of the support. Sheet. 5. A printing / decoloring type self-coloring comprising a support having a decolorizing layer and a self-coloring pressure-sensitive recording layer on one surface, and a pigment coating layer for printing provided on the opposite surface of the support. Sensitive pressure recording sheet. 6. A magnetic recording / decoloring type self-coloring pressure-sensitive pressure-sensitive recording medium comprising a support having a decoloring layer and a self-coloring pressure-sensitive recording layer on one surface, and a magnetic recording layer provided on the opposite surface of the support. Recording sheet. 7. A decolorizable self-coloring pressure-sensitive recording label comprising a support having a decoloring layer and a self-coloring pressure-sensitive recording layer on one surface, and an adhesive layer provided on the opposite surface of the support. 8. A forgery prevention or forgery detection method using a pressure-sensitive recording sheet, which is capable of pressure-sensitive self-coloring and in which a color-developed portion is decolored within a set decoloring time.