JPH06143811A - Heat sensitive recording type magnetic ticket sheet - Google Patents

Abstract

PURPOSE:To provide heat sensitive recording type magnetic ticket sheet which does not deteriorate apply-uniformly and magnetic layer through the Influence of a plasticizer from the magnetic recording layer side by using a magnetic paint having a fine pot life and not undergoing a secular deterioration in its apply characteristics. CONSTITUTION:The heat sensitive recording type magnetic ticket sheet is featured in that a magnetic recording layer consisting mainly of a ferromagnetic body and a binding agent is provided on one surface of a supporter, and a heat sensitive recording layer containing a leuco dyestuff and an acid substance as a generating constituent is provided, wherein polyvinyl alcohol is used as a dispersing agent of the ferromagnetic body, and polyvinyl alcohol is used as a binding agent of the magnetic recording layer. Also, polyvlnyl alcohol having a saponificaiton degree of 90% or more is used as a dispersing agent of the ferromagnetic body and a binding agent of the magnetic recording layer, and a silicone defoaming agent is used in the magnetic recording agent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a heat-sensitive recording type magnetic ticket sheet having a magnetic recording layer and a heat-sensitive recording layer.

[0002]

2. Description of the Related Art Conventionally, a heat-sensitive recording type magnetic ticket sheet has a heat-sensitive recording layer containing a leuco dye and an acidic substance as a main component on one surface of a plastic sheet or paper and a ferromagnetic material and a binder on the other surface. It is formed by forming a magnetic recording layer containing a binder as a main component. In recent years, there has been a demand for higher density of the magnetic recording layer as the amount of recorded information increases, and it is considered to reduce the particle size of the ferromagnetic material, use a ferromagnetic material with a high coercive force, and improve the rectangular magnetization characteristics. Has been done. In order to manufacture such a high-density magnetic recording medium, one technical problem is how to stably disperse the ferromagnetic powder into a coating liquid.

For this reason, a great deal of labor is spent on research for improving the dispersibility of the coating liquid, for example, surface modification of magnetic powder, development of various dispersers and dispersion processes, new dispersants and binders. Various methods for improving dispersibility such as the use of agents have been investigated. Among them, regarding the magnetic powder dispersion method, the magnetic powder is dispersed with a dispersant or a binder in water or an organic solvent by a dissolver, a kneader, a ball mill, a sand grinder, a paint shaker, or a disperser, a so-called thermal dispersion. Was adopted. The reason for this is that needle-shaped γ-ferrite powder and metal powder, which are used for most applications except for magnetic cards, are brittle against mechanical stress and are easily broken. It is considered that this is because it is particularly susceptible to oxidation and there is a risk of ignition or explosion in a dry state, and therefore it is necessary to always handle it in a wet state. As described above, conventionally, since the magnetic coating material is purified by a complicated and troublesome dispersing means, the problem that the productivity of the magnetic recording medium is low has always been encountered.

Further, in the case of these magnetic coating liquids, a particularly important problem is the liquid stability of the coating liquid, that is, the pot life with respect to temperature, shear, time, etc., which affect the magnetic coating liquid. Therefore, it has been desired to prepare a stable coating solution that does not aggregate with time.

On the other hand, a coupon ticket or a commuter ticket prepared by using the dye-based thermal recording system has a long valid period of 3 to 6 months, and the user keeps it in a synthetic resin wallet or commuter pass during this period. It is the current situation. In such a case, the coupon ticket or the commuter ticket is in contact with the synthetic resin, but the synthetic resin has a plasticizer such as dioctyl phthalate (DO).
P), dioctyl adipate (DOA), etc. are added, and this plasticizer easily penetrates into the thermosensitive coloring layer of a coupon ticket or a commuter ticket in contact with a synthetic resin. The plasticizer that has penetrated into the thermosensitive coloring layer causes the printing portion (coloring portion) to be decolored due to that. Such decoloring of the printing portion during use of the coupon ticket or the commuter ticket causes various troubles and significantly impedes the automatic sale of the coupon ticket or the commuter ticket.

In order to solve the above-described problem of decoloring of the color-developed portion, it has been proposed to provide a protective layer containing a water-soluble polymer resin as a main component on the thermosensitive color-developing layer. However, in this case, the influence of the plasticizer from the thermosensitive coloring layer side is remarkably improved, but the influence of the plasticizer from the magnetic recording layer side is not improved at all and a satisfactory effect is not obtained.

[0007]

SUMMARY OF THE INVENTION In view of the above situation, the object of the present invention is to deteriorate the coating uniformity and the magnetic properties by using a magnetic coating material which has an excellent pot life and does not deteriorate the coating property over time. Another object of the present invention is to provide a heat-sensitive recording type magnetic ticket sheet in which the heat-sensitive color developing layer is prevented from being decolored due to the influence of a plasticizer from the magnetic recording layer side.

[0008]

According to the present invention, a magnetic recording layer containing a ferromagnetic material and a binder as a main component is provided on one surface of a support, and the other surface of the support is usually colorless or In a heat-sensitive recording type magnetic ticket sheet provided with a light-sensitive leuco dye and a heat-sensitive recording layer containing an acidic substance as a generating component, polyvinyl alcohol is used as a dispersant for a ferromagnetic material, and as a binder for the magnetic recording layer. Provided is a heat-sensitive recording type magnetic ticket sheet using polyvinyl alcohol.

The present invention also provides a dispersant for the ferromagnetic material,
And a thermosensitive recording-type magnetic ticket sheet having a saponification degree of polyvinyl alcohol as a binder of the magnetic recording layer of 90% or more.

The present invention also provides a heat-sensitive recording type magnetic ticket sheet using a silicone defoaming agent in the magnetic recording layer.

It has been well known that polyvinyl alcohol has an excellent protective colloid property and its good film-forming property. Since the ferromagnetic substance itself is very easily magnetized, it is difficult to disperse the magnetic powders with each other, but if polyvinyl alcohol is used as a dispersant for such ferromagnetic powders, it will be relatively easily dispersed. It is possible to obtain a stable coating liquid.

Further, when the coating solution is coated on a support, a uniform magnetic coating film is formed due to good film forming properties, and the magnetic characteristics can be improved. In addition, polyvinyl alcohol has a strong barrier property against plasticizers, and its use in the magnetic recording layer can prevent the plasticizer from penetrating from the magnetic side. It is possible to improve the sex.

As the polyvinyl alcohol used in the present invention, any conventionally known polyvinyl alcohol can be arbitrarily applied. Particularly, polyvinyl alcohol having a saponification degree of 90% or more gives a stable and robust coating film such as water resistance of the magnetic recording layer. It is more preferable because it is possible.

On the other hand, when polyvinyl alcohol is used as a magnetic liquid, its surface is often foamed so that the surface coated with the magnetic liquid is roughened to deteriorate the magnetic properties. As a countermeasure, it is necessary to add an antifoaming agent. The function of the defoaming agent has two functions of defoaming property and defoaming property, but both are excellent defoaming agents (1) small surface tension,
(2) It is considered that conditions such as low solubility are necessary, and silicone antifoaming agents satisfy these conditions.

The silicone defoaming agent is fundamentally different in chemical structure from other organic compound type defoaming agents, is non-polar, and does not associate with those having a polar atomic group such as water. In addition, its surface tension is lower than that of other organic antifoaming agents, so it shows strong defoaming ability, and the addition of a very small amount of it has a sufficient effect, thus affecting the properties of the final product. The possibility of giving it is also small.

The silicone antifoaming agent used in the present invention can be classified into silicone oil, oil compound, solution, emulsion and the like depending on its form. However, since it is an aqueous foaming liquid, the emulsion type is mainly suitable.

Ferromagnetic materials used in the present invention include barium ferrite, strontium ferrite and Co-γ.
-Fe ₂ O _3, but including γ-Fe ₂ O ₃ is used, in consideration of the technical assistance which the magnetic recording information is deleted or attenuated by the usual permanent magnet, the coercive force is 1500 to 5000 Oe, such as barium ferrite It is preferable to use a ferromagnetic material having a high coercive force.

As the binder resin of the present invention, various conventional binders can be appropriately used in combination with polyvinyl alcohol. Specific examples thereof include the following. That is, methoxy cellulose, hydroxyethyl cellulose, carboxymethyl cellulose, methyl cellulose,
Cellulose derivatives such as ethyl cellulose, sodium polyacrylate, polyvinylpyrrolidone, acrylamide /
Acrylic ester copolymer, acrylamide / acrylic acid ester / methacrylic acid terpolymer, styrene / maleic anhydride copolymer alkali salt, isobutylene /
Water-soluble polymers such as maleic anhydride copolymer alcal salt, polyacrylamide, sodium alginate, gelatin, and casein, as well as polyvinyl acetate, polyurethane, polyacrylic acid ester, polymethacrylic acid ester, vinyl chloride / vinyl acetate copolymer Polymers, emulsions such as ethylene / vinyl acetate copolymers, latexes such as styrene / butadiene / acrylic copolymers, etc.

The leuco dyes used in the thermosensitive coloring layer of the present invention may be used alone or as a mixture of two or more kinds. As such leuco dyes, those applied to the thermosensitive recording material of this kind are arbitrary. And leuco compounds of dyes such as triphenylmethane type, fluorane type, phenothiazine type, auramine type, spiropyran type and indolinophtalide type dyes are preferably used. Specific examples of such leuco dyes include those shown below.

3,3-bis (p-dimethylaminophenyl) -phthalide, 3,3-bis (p-dimethylaminophenyl) -6-dimethylaminophthalide (also known as crystal violet lactone), 3,3-bis ( p-dimethylaminophenyl) -6-diethylaminophthalide, 3,3-bis (p-dimethylaminophenyl) -6-chlorophthalide, 3,3-bis (p-dibutylaminophenyl) phthalide, 3-cyclohexylamino- 6-chlorofluorane, 3-dimethylamino-5,7-dimethylfluorane, 3
-Diethylamino-7-chlorofluorane, 3-diethylamino-7-methylfluorane, 3-diethylamino-
7,8-benzfluorane, 3-diethylamino-6-methyl-7-chlorofluorane, 3- (Np-tolyl-N-ethylamino) -6-methyl-7-anilinofluorane,
3-pyrrolidino-6-methyl-7-anilinofluorane, 2
-{N- (3'-trifluoromethylphenyl) amino}
-6-diethylaminofluorane, 2- {3,6-bis (diethylamino) -9- (o-chloroanilino) xanthyl benzoate lactam}, 3-diethylamino-6-methyl-7
-(M-trichloromethylanilino) fluorane, 3-diethylamino-7- (o-chloroanilino) fluorane,
3-dibutylamino-7- (o-chloroanilino) fluorane, 3-N-methyl-N-amylamino-6-methyl-7
-Anilinofluorane, 3-N-methyl-N-cyclohexylamino-6-methyl-7-anilinofluorane, 3-
Diethylamino-6-methyl-7-anilinofluorane,
3- (N, N-diethylamino) -5-methyl-7- (N, N
-Dibenzylamino) fluorane, benzoyl leuco methylene bull-, 6'-chloro-8'-methoxy-benzoindolino-pyrrilospirane, 6'-bromo-3'-methoxy-
Benzindolino-pyrrilospirane, 3- (2'-hydroxy-4'-dimethylaminophenyl) -3- (2'-methoxy-5'-chlorophenyl) phthalide, 3- (2'-hydroxy-4'-dimethylamino Phenyl) -3- (2'-methoxy-5'-nitrophenyl) phthalide, 3- (2'-hydroxy-4'-diethylaminophenyl) -3- (2'-
Methoxy-5'-methylphenyl) phthalide, 3- (2'-
Methoxy-4'-dimethylaminophenyl) -3- (2'-
Hydroxy-4'-chloro-5'-methylphenyl) phthalide, 3-N-ethyl-N-tetrahydrofurfurylamino-6-methyl-7-anilinofluorane, 3-N-ethyl-
N-(-2-ethoxypropyl) amino-6-methyl-7-
Anilinofluorane, 3- (N-methyl-N-isobutylamino) -6-methyl-7-anilinofluorane, 3-morpholino-7- (N-propyl-trifluoromethylanilino) fluorane, 3- Pyrrolidino-7-trifluoromethylanilinofluorane, 3-diethylamino-5-chloro-7- (N-benzyl-trifluoromethylanilino)
Fluorane, 3-pyrrolidino-7- (di-p-chlorophenyl) methylaminofluorane, 3-diethylamino-5
-Chloro-7- (α-phenylethylamino) fluorane, 3- (N-ethyl-p-toluidino) -7- (α-phenylethylamino) fluorane, 3-diethylamino-7
-(O-Methoxycarbonylphenylamino) fluorane, 3-diethylamino-5-methyl-7- (α-phenylethylamino) fluorane, 3-diethylamino-7-
Piperidinofluorane, 2-chloro-3- (N-methyltoluidino) -7- (pn-butylanilino) fluorane, 3-di-n-butylamino-6-methyl-7-anilinofluorane, 3 , 6-Bis (dimethylamino) fluorene spiro (9,3 ')-6-dimethylaminophthalide, 3- (N-benzyl-N-cyclohexylamino) -5,6-benzo-7
-Α-naphthylamino-4'-bromofluorane, 3-diethylamino-6-chloro-7-anilinofluorane, 3
-Diethylamino-6-methyl-7-mesitidino-4 ', 5'
-Benzofluorane, 3-N-methyl-N-isopropylamino-6-methyl-7-anilinofluorane, 3- (N-
Ethyl-N-isoamylamino) -6-methyl-7-anilinofluorane, 3-diethylamino-6-methyl-7-
(2 ', 4'-Dimethylanilino) fluorane etc.

As the developer used in the thermosensitive color developing layer of the present invention, various electron-accepting compounds that cause the leuco dye to develop color upon contact, or oxidizing agents are used. Such a material is conventionally known, and specific examples thereof include the following.

4,4'-isopropylidene bisphenol,
4,4'-isopropylidene bis (o-methylphenol),
4,4'-Secondary butylidene bisphenol 4,4'-isopropylidene bis (2-tert-butylbutylphenol), zinc p-nitrobenzoate, 1,3,5-tris (4-
Tertiary butyl-3-hydroxy-2,6-dimethylbenzyl) isocyanuric acid, 2,2- (3,4-dihydroxydiphenyl) propane, bis (4-hydroxy-3-methylphenyl) sulfide, 4- {β -(p-Methoxyphenoxy) ethoxy} salicylic acid, 1,7-bis (4-hydroxyphenylthio) -3,5-dioxaheptane, phthalic acid monobenzyl ester monocarboxylic acid, 4,4'-cyclohexylidenepheno -L, 4,4'-isopropylidene bis (2-chlorophen-
, 2,2'-methylenebis (4-methyl-6-tert-butylphenol), 2,2'-methylenebis (4-ethyl-6)
-Tert-butylphenol), 4,4'-butylidenebis (6-tert-butyl-2-methyl) phenol,
1,1,3-Tris (2-methyl-4-hydroxy-5-tert-butylphenyl) butane, 1,1,3-Tris (2-methyl-4-hydroxy-5-cyclohexylphenyl) butane, 4, Four'-
Thiobis (6-tert-butyl-2-methyl) phenol, 4,4'-diphenolsulfone, 4-isopropoxy-
4'-hydroxydiphenyl sulfone, 4-benzyloxy-4 '
-Hydroxydiphenyl sulfone, 4,4'-diphenol sulfoxide, isopropyl P-hydroxybenzoate, P-
Benzyl hydroxybenzoate, benzyl protocatechuate, stearyl gallate, lauryl gallate, octyl gallate, 1,3-bis (4-hydroxyphenylthio) -propane, N, N'-diphenylthiourea, N, N'- Di (m-chlorophenyl) thiourea, salicylanilide, 5-chloro-
Salicylanilide, bis (4-hydroxyphenyl) acetic acid methyl ester, bis (4-hydroxyphenyl) acetic acid benzyl ester, 1,3-bis (4-hydroxycumyl) benzene, 1,4-bis (4-hydroxycumyl) ) Benzene, 2,4 '
-Diphenol sulfone, 2,2'-diallyl-4,4'-diphenol sulfone, 3,4-dihydroxy-4'-methyldiphenyl sulfone, zinc 1-acetyloxy-2-naphthoate, 2-acetyloxy- Zinc 1-naphthoate, 2-acetyloxy-3-
Zinc naphthoate, α, α-bis (4-hydroxyphenyl)
-α-methyltoluene, antipyrine complex of zinc thiocyanate, tetrabromobisphenol A, tetrabromobisphenol S 4,4'-thiobis (2-methylphenol), 4,4'-thiobis
(2-chlorophenol) etc.

Further, in the heat-sensitive recording layer of the present invention, together with the above-mentioned leuco base and the color developer, if necessary, auxiliary additives commonly used in heat-sensitive recording materials of this kind, such as pigments and heat-fusible substances, are used. , A surfactant and the like can be used in combination. In this case, as the filler, for example, calcium carbonate, silica, zinc oxide, titanium oxide, aluminum hydroxide, zinc hydroxide, barium sulfate, clay, talc,
Inorganic fine powders such as surface-treated calcium and silica, as well as organic fine powders such as urea-formalin resin, styrene / methacrylic acid copolymer and polystyrene resin can be mentioned. Examples of the heat-fusible substance include higher fatty acids or esters, amides or metal salts thereof, various waxes, condensates of aromatic carboxylic acids and amines, benzoic acid phenyl esters, higher linear glycols. 50,3,4-epoxy-dialkyl hexahydrophthalate, higher ketones and other heat-fusible organic compounds
Those having a melting point of about 200 ° C. can be mentioned.

Further, in the present invention, if necessary,
An under layer may be provided between the support and the thermosensitive coloring layer, and a protective layer may be provided on the thermosensitive coloring layer. The under layer or the protective layer may contain a pigment, a binder, a heat fusible substance, and the like. In this case, specific examples of the pigment, the binder, and the heat fusible substance include: Examples thereof are the same as those exemplified in relation to the thermosensitive coloring layer.

[0025]

EXAMPLES The present invention will now be described in detail with reference to examples. The parts and% shown below are based on weight. {A liquid} Barium ferrite (coercive force 2700 Oe, average particle size 0.6 μm) 100 parts Carbon black (38% dispersion liquid) 20 parts Polyvinyl alcohol 10% aqueous solution 40 parts (Kuraray PVA-205, Ken degree 88%) Water 60 parts {B liquid} barium ferrite 100 parts carbon black 20 parts polyvinyl alcohol 10% aqueous solution 40 parts (Kuraray PVA-110, Ken degree 98.5%) water 60 parts {C liquid} barium ferrite 100 parts carbon black 20 parts polyvinyl alcohol 10% aqueous solution 40 parts (Kuraray PVA-117, Ken degree 98.5%) Silicone defoamer (San Nopco SN Deformer-382) 0.5 parts Water 60 parts {D liquid} Barium ferrite 100 parts Polyoxypropylene-poly Oxystyrene block polymer 10 parts 10% solution carbon black 20 parts water 60 parts E liquid} Barium ferrite 100 parts Carbon black 20 parts Sodium polycarboxylate 40% aqueous solution (Toagosei Aron T-40) 5 parts Water 60 parts {F liquid} Barium ferrite 100 parts Carbon black 20 parts Sodium polyacrylate 40% Aqueous solution 10 parts Water 60 parts

The respective mixtures having the compositions of {A} to {F} are dispersed using a sand grinder so that the average particle diameter becomes 5 to 7 μm, and dispersions {A}, {B},
The {C}, {D} and {F} solutions were prepared.

{G} liquid 3- (N-methyl-N-cyclohexine) amino-25.0 parts 6-methylanilinofluorane 10% polyvinyl alcohol aqueous solution 25.0 parts water 50.0 parts {H} liquid 3,3′-5,5′-Tetrabromobisphenol S 25.0 parts Calcium carbonate 100.0 parts Polyvinyl alcohol 10% aqueous solution 200.0 parts Water 400.0 parts [I] liquid Carboxy modified polyvinyl alcohol 10% aqueous solution 20 0.0 parts Silica 1.5 parts Zinc stearate 0.15 parts Polyamide epichlorohydrin 12.5% aqueous solution 6.5 parts Water

The respective mixtures having the compositions [G] to [I] are dispersed by using a sand grinder so that the average particle diameter becomes 1.5 to 2 μm, and the dispersion liquid [G],
The [H] and [I] solutions were prepared.

[Example 1] [A] Liquid 100 parts Polyvinylidene chloride (49% dispersion liquid) 45 parts A magnetic coating liquid having the above composition was prepared to have a basis weight of 150 g / m ^2.
A magnetic recording layer was provided by coating and drying on one surface of the wood free paper so that the dry weight was 33 g / m ² . [G] liquid 40 parts [H] liquid 320 parts water 60 parts Next, a heat-sensitive coating solution having the above composition was prepared on the other surface of the support, and the coating was dried so that the dry weight was 6 g / m ^2. Then, a thermosensitive recording layer was provided. Further, an overcoat coating solution comprising the solution [I] is applied and dried on the thermosensitive coloring layer so that the dry weight is 3 g / m ^2, and an overcoat layer is provided to obtain a thermosensitive recording magnetic ticket sheet of the present invention. It was

[Example 2] A thermosensitive recording magnetic ticket sheet of the present invention was obtained in the same manner as in Example 1 except that the dispersion liquid [B] was used in place of the dispersion liquid [A] of the first embodiment.

Example 3 A thermosensitive recording magnetic ticket sheet of the present invention was obtained in the same manner as in Example 1 except that the dispersion liquid [C] was used instead of the dispersion liquid [A].

Example 4 A heat-sensitive recording magnetic ticket sheet of the present invention was obtained in the same manner as in Example 1 except that the magnetic coating liquid of the following composition was used in place of the magnetic coating liquid of Example 1. [C] Liquid 100 parts Polyvinylidene chloride (49% dispersion liquid) 45 parts Polyvinyl alcohol 10% aqueous solution (PVA-117 made by Kuraray) 15 parts

Comparative Example 1 A thermosensitive recording magnetic ticket sheet of the present invention was obtained in the same manner as in Example 1 except that the dispersion liquid [D] was used instead of the dispersion liquid [A] of the first embodiment.

Comparative Example 2 A thermosensitive recording type magnetic ticket sheet of the present invention was obtained in the same manner as in Example 1 except that the dispersion liquid [E] was used instead of the dispersion liquid [A] of the first embodiment.

[Comparative Example 3] A thermosensitive recording magnetic ticket sheet of the present invention was obtained in the same manner as in Example 1 except that the dispersion liquid [F] was used instead of the dispersion liquid [A] of the first embodiment.

The magnetic characteristics of the magnetic recording layer of the heat-sensitive recording type magnetic ticket sheet thus obtained were evaluated by a vibrating sample magnetometer (manufactured by Toei Industry Co., Ltd.), and a thermal inclination tester (Toyo Corporation) was used for the heat-sensitive recording layer. The color density and the plasticizer resistance from the magnetic surface were evaluated by Seiki Co., Ltd.). The results are shown in Table 1.

Further, the above Examples 1 to 4 and Comparative Example 1
Experiment to confirm the pot life of the magnetic coating liquid of ~ 3,
The particle size of the magnetic coating liquid when shearing (stirring) was forcibly added continuously for one week with a lab stirrer, the surface condition when coated on a support, and changes in its magnetic properties were evaluated. The results are shown in Table 2.

The evaluation methods of Table 1 and Table 2 are as follows. [Evaluation method] Coercive force, residual magnetic flux density, squareness ratio: Measurement was performed using a vibrating sample magnetometer (VSM-P7 type manufactured by Toei Industry Co., Ltd.) in a magnetic field of 10 KOe. Color density: Macbeth densitometer RD-914, the maximum color density when printed with a thermal inclination tester (manufactured by Toyo Seiki Co., Ltd.) with a thermal head temperature of 100 to 150 ° C and a pressure of 1 kg / cm ^{2 for a} pressure of 3 seconds. It measured with the filter W-106. Background density: The non-printed portion was measured in the same manner as above. Plasticizer property: A polyvinyl chloride film containing a plasticizer is overlaid on the magnetic surface of the sample obtained in the color density / background density test, and a load of 250 g / cm ² is applied, and the film is dried at 50 ° C. After storing for 48 hours, the densities of the colored part and the background part were measured. Grain size: Particle size distribution measuring device (LA-70 manufactured by Horiba Ltd.
The particle size was measured with a 0 type). Coating surface property: A magnetic coating solution is coated on one surface of a high-quality paper with a basis weight of 150 g / m ² to a dry weight of 33 / m ² and dried to form a magnetic recording layer, and the surface condition is felt. It was judged by the following rank. A: The surface is very smooth. ○: The surface is smooth. △ …… The surface is a little rough. × …… The surface is very rough.

[0039]

[Table 1] Table 1

[0040]

[Table 2] Table 2

[0041]

From the results shown in Tables 1 and 2, the thermal recording type magnetic recording paper according to the present invention is superior in pot life of magnetic liquid and coatability as compared with the comparative product, and the magnetic recording medium obtained by using them. It can be seen that the magnetic properties are stable without deterioration over time, and that the present invention has sufficient reliability against penetration of the plasticizer from the magnetic surface as compared with the comparative product.

Claims (3)

[Claims] 1. A magnetic recording layer containing a ferromagnetic material and a binder as main components is provided on one surface of a support, and a colorless or light-colored leuco dye and an acidic substance are usually provided on the other surface of the support. In a heat-sensitive recording type magnetic ticket sheet provided with a heat-sensitive recording layer containing as a generating component, polyvinyl alcohol is used as a dispersant for a ferromagnetic material, and polyvinyl alcohol is used as a binder for the magnetic recording layer. Thermal recording type magnetic ticket sheet. 2. The heat-sensitive recording type magnetic ticket sheet according to claim 1, wherein the degree of saponification of the dispersant of the ferromagnetic material and the binder of the magnetic recording layer of polyvinyl alcohol is 90% or more. . 3. The heat-sensitive recording-type magnetic ticket sheet according to claim 1, wherein a silicone defoaming agent is used in the magnetic recording layer.