JPH03256789A - Manufacture of heat-sensitive recording material - Google Patents

Abstract

PURPOSE:To prepare a color material-containing layer having uniform thickness, adhesive strength and good reliasability by laminating the color material- containing layer on a transfer material to transfer the same to a recording material. CONSTITUTION:The fundamental structure of a heat-sensitive recording material is formed by laminating a recording material 1 and a color material-containing layer 2. It is desirable that the recording material has good heat-resistant strength and high dimensional stability. As the recording material, plain paper, a metal sheet such as an aluminum foil and the like are pref. used. When a tacky mordant layer and a tacky color material layer are not used, a taky layer is necessary. The recording material requires sufficient self-supporting properties and the thickness thereof is pref. adjusted to the range of 1-500mum. As the color material-containing layer 2, a heat-softenable color material layer and a dye supply layer can be designated. The heat-softenable color material layer is used in the state laminated to the recording material having self-supporting properties and the dye supply layer is pref. laminated to the mordant layer to be used. The heat-softenable color material layer contains a binder and a color material.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for producing a heat-sensitive recording material.

More specifically, it is possible to form a coloring material-containing layer on the surface of a recording medium with a uniform layer thickness and uniform adhesive force on the surface of the recording medium, without having to select the type of recording medium. The present invention relates to a method for producing a heat-sensitive recording material.

[Prior Art and Problems to be Solved by the Invention] In recent years, thermosensitive coloring materials have been widely used as thermosensitive recording materials for facsimiles and the like.

The thermosensitive coloring material, such as thermosensitive coloring paper, contains a coloring agent dispersed in a recording medium. This heat-sensitive coloring paper usually applies heat to its surface in an image-wise manner to cause the heat-applied portion to develop color, thereby forming prints on the surface of the recording medium.

The surface of such heat-sensitive coloring paper tends to change color over time after printing, and in particular, areas outside the printing area may discolor if slight heat or sunlight is repeatedly applied to the area outside the printing area. Also, like the ink version, there is a problem that the storage stability of the printed image is poor, such as coloring or discoloration.

On the other hand, as a recording material with better storage stability than the above-mentioned heat-sensitive color forming materials, there is a heat-sensitive transfer material such as a heat-sensitive transfer sheet (or ribbon).This heat-sensitive transfer sheet forms a heat-melting coloring material layer on the surface of a support. It will be done. This heat-sensitive transfer sheet is produced by applying heat to the heat-sensitive transfer sheet in an image-wise manner while keeping the heat-melting color material layer in close contact with a recording medium such as paper; By peeling off, the melt-adhered heat-softening coloring material layer is adhered to the recording medium, and a printed image is formed on the surface of the recording medium. Another type of thermal transfer sheet is one in which the recording medium and the thermal transfer sheet, which exist independently of each other, are layered and stored in a roll, and when used, the roll is rewound. At the same time, heat is applied imagewise to the thermal transfer sheet, and then the thermal transfer sheet is peeled off from the recording medium, so that the melt-adhered heat-softening coloring material layer is adhered to the recording medium. A printed image is formed on the surface.

Such a thermal transfer sheet requires a recording medium that exists separately from the thermal transfer sheet to record a printed image, and also requires the presence of an expensive support that is completely unnecessary after use. . In addition, since the recording medium and the thermal transfer sheet are originally separate entities, and the thermal transfer sheet is a thin sheet, when printing is performed while unwinding the rolled thermal transfer sheet, the recording medium and Thermal transfer sheets tend to wrinkle, resulting in problems such as distorted printed images, difficulty in rewinding the thermal transfer sheet, and inability to run the thermal transfer sheet stably.

It has superior storage stability compared to such conventional heat-sensitive coloring materials, does not require a separate recording medium unlike heat-sensitive transfer materials, and does not generate unnecessary supports after use. As a permanent heat-sensitive recording material, a coloring material-containing layer is provided on a recording body, which is peelable from the recording body and which forms an image on the recording body by peeling from the recording body after imagewise heating. A heat-sensitive recording material made of laminated layers has been proposed.

This type of heat-sensitive recording material must have a coloring material-containing layer on the surface of the recording material with a uniform thickness and uniform adhesive strength. Therefore, if this type of heat-sensitive recording material is manufactured by directly applying the coating liquid for the coloring material-containing layer onto the surface of the recording medium, if the recording medium or rough paper is used, the coating liquid for the coloring material-containing layer may be By soaking into the paper, a coloring material-containing layer with uneven thickness and adhesive strength is formed. Therefore, recording bodies in this type of heat-sensitive recording material are limited to materials with a special smooth surface.

This invention has been made based on the above circumstances. That is, the object of this invention is to have uniform thickness and adhesive strength,
A heat-sensitive recording material in which a coloring material-containing layer with good peelability from the recording material is laminated on the recording material after imagewise heating is applied directly to the recording material with a coating liquid for the coloring material-containing layer. The purpose is to provide a method that allows molding without any need for molding.

[Means for Solving the Problems] The present invention for solving the problems described above provides a method of forming a film on a recording medium that is peelable from the recording medium and that is peeled off from the recording medium after imagewise heating. In manufacturing a heat-sensitive recording material formed by laminating a coloring material-containing layer for forming an image on a recording body, the coloring material-containing layer is laminated on a transfer body, and then the coloring material-containing layer is transferred onto the recording body. A method for producing a heat-sensitive recording material, which is characterized in that it is peelable from the recording material and forms an image on the recording material by peeling from the recording material after imagewise heating. In producing a heat-sensitive recording material formed by laminating coloring material-containing layers, the coloring material-containing layer is formed on the back side of the recording body, and this is wound up, and the coloring material-containing layer formed on the back side of the recording body is recorded. This is a method for producing a heat-sensitive recording material, which is characterized by transferring it onto a body surface and then rewinding it.

The basic structure of the heat-sensitive recording material produced according to the present invention is, as shown in FIG. 1, formed by laminating the recording medium 1 and a coloring material-containing M2. However, the heat-sensitive recording material of the present invention is not limited to the two-layer structure consisting of the recording medium and the coloring material-containing layer, and various layer structures may be employed within the range that does not impede the object of the present invention. It comes. For example, the heat-sensitive recording material of the present invention may have a layer structure in which an anti-sticking layer, a release layer, a support layer for release, a support layer, an adhesive layer, an antifogging layer, etc. are provided as appropriate depending on the purpose.

Next, the structure of the heat-sensitive recording material according to the present invention will be explained in sections.

1. Recording body 1. It is desirable that the recording body has good heat resistance strength and high dimensional stability.

The materials include, for example, papers such as plain paper, condenser paper, laminated paper, and coated paper; resin films such as polyethylene, polyethylene terephthalate, polystyrene, polypropylene, and polyimide; composites of paper and resin films; Metal sheets such as aluminum foil are preferably used. If an adhesive mordant layer and an adhesive coloring material layer are not used, this recording medium requires an adhesive layer. As the adhesive, the same adhesive used for the adhesive mordant layer can be used.

This recording body is required to have sufficient self-supporting properties, and for this purpose, the thickness of the recording body is adjusted to, for example, the following, preferably within the range of IBm to 500 gm. If the thickness of the recording medium is less than lpm, the self-supporting properties of the recording medium may be lost.

The shape of the recording medium can be determined as appropriate depending on the use of the heat-sensitive recording material, such as tape, sheet, etc.
An arbitrary shape such as a label shape can be adopted.

In this invention, a mordant layer and an adhesive mordant layer can be used as other aspects of the recording body.

The mordant layer is a layer that forms an image by receiving dye that has diffused and moved when heated and fixing the dye.

The adhesive mordant layer can be formed by adding an adhesive to the components forming the mordant layer.

The adhesive is not particularly limited, and commonly used adhesives can be used.

Specific examples of the adhesive include natural rubber, chloroprene rubber-based, butyl rubber-based, polyacrylic ester-based, nitrile rubber-based, polysulfide-based, silicone rubber-based adhesives, recycled rubber, SBR, polyisoprene,
Examples include adhesives using polybnylether, Buna N, etc., ethylene copolymer adhesives, and acrylic adhesives.

Among these, preferred are natural rubber, chloroprene rubber, butyl rubber, polyacrylic acid ester, ethylene copolymer, and acrylic adhesives.

In addition, the adhesive includes a tackifier, a plasticizer, a filler,
Examples of the tackifier which may contain an anti-aging agent and the like include polyterpene S1M, gum rosin, rosin derivatives, oil-soluble phenol resins, coumaron indene resins, coumaron resins, indene resins, petroleum hydrocarbon resins, etc. Can be mentioned.

Examples of the plasticizer include cephalic oil, liquefied bolybdenum, liquid polyacrylate, and lanolin.

Examples of the filler include zinc white, aluminum hydrate, titanium oxide, calcium carbonate, clay, pigment, silica, aluminum hydroxide, and the like.

Examples of the anti-aging agent include di-thiocarbamates, metal chelating agents, and anti-aging agents for rubber.

The content of the adhesive in the adhesive mordant layer is
Depending on the type of component forming the adhesive mordant layer, its content, etc., and the type of adhesive, it may or may not be determined in general. In short, it is possible to easily peel off the adhesive mordant layer from the dye supply layer. At the same time, the adhesive mordant layer is appropriately determined so as to exhibit adhesive force or adhesion force to the extent that the adhesive mordant layer can be easily attached to other members. Usually, the content of the adhesive in the adhesive mordant layer is 1 to 90% by weight.

The mordant layer is suitable as a recording medium when the colorant-containing layer is a dye-supplying layer, and the adhesive mordant layer is a dye-supplying layer containing a thermally diffusible dye.

The materials constituting the mordant layer typically include thermoplastic resins, thermofusible substances, and plasticizers.

Preferred thermoplastic resins include, for example, polyester resins, vinyl chloride resins, vinylidene chloride resins, urethane resins, polyvinyl alcohol resins, cellulose resins, and the like.

Specific examples of the heat-melting substance include vegetable waxes such as carnauba wax, wood wax, auriculie wax, and nispar wax. 10. Animal waxes such as insect wax, shellac wax and spermaceti wax; petroleum waxes such as paraffin wax, microcrystal wax, polyethylene wax, ester wax and acid wax; and waxes such as mineral waxes such as montan wax, osichelite and selecta. In addition to these waxes, there are also valmitic acid and stearic acid.

Higher fatty acids such as margaric acid and behenic acid; Higher alcohols such as valmityl alcohol, stearyl alcohol, behenyl alcohol, marganyl alcohol, myricyl alcohol and eicosanol; Higher fatty acid esters: amides such as acetamide, propionic acid amide, balmitic acid amide, stearic acid amide and amide wax;
and higher amines such as stearylamine, behenylamine, and valmitin.

Examples of the plasticizer include phthalate ester plasticizers, phosphate ester plasticizers, adipate ester plasticizers, sebacate ester plasticizers, azelaic ester plasticizers, citric acid ester plasticizers, The plasticizer can be selected from glycolic acid ester plasticizers, trimellitic acid ester plasticizers, phthalic acid isomer ester plasticizers, polyester plasticizers, epoxy plasticizers, and the like.

Furthermore, examples of other plasticizers include fatty acid esters, fatty acids, silicone oils, modified silicone oils, fluorine oils, liquid paraffins, and the like.

Among the thermoplastic resins, if they can themselves be formed into a film or sheet, such thermoplastic resins can act as a support in addition to acting as a dye-receiving mordant layer. .

Colorant-Containing Layer The colorant-containing layer used in the heat-sensitive recording material of the present invention includes a heat-softening colorant layer and a dye supply layer. The heat-softening coloring material layer is used by being laminated with the recording medium having self-supporting characteristics. Further, it is preferable that the dye supply layer is used in a laminated manner with the mordant layer. Additionally, the dye supply layer may be self-supporting.

The heat-softening coloring material layer contains a binder and a coloring material.

Examples of the binder include thermofusible substances and thermoplastic resins.

As the heat-fusible substance, one of the substances mentioned above as the material constituting the mordant layer can be used.

The thermoplastic resins include ethylene copolymers, polyamide resins, polyester resins, polyurethane resins, polyolefin resins, acrylic resins, vinyl chloride resins, cellulose resins, rosin resins, ionomer resins, and Resins such as petroleum-based resins; Elastomers such as natural rubber, styrene-butadiene rubber, isoprene rubber, chloroprene rubber, and diene copolymers:
Rosin derivatives such as ester gum, rosin maleic acid resin, rosin phenol resin, and hydrogenated rosin; and polymeric compounds with a softening point of 50 to 150°C such as phenol resin, terpene resin, cyclopentadiene resin, and aromatic hydrocarbon resin. I can list the following.

The heat-melting material and the thermoplastic material can be appropriately selected to form a heat-softening coloring material layer having a desired heat-softening point or heat-melting point.

As the coloring material, mention may be made, for example, of pigments such as inorganic pigments and organic pigments, and dyes.

Examples of the inorganic pigments include titanium dioxide, carbon black, zinc oxide, Prussian blue, cadmium sulfide, iron oxide, and chromates of lead, zinc, barium, and calcium.

Examples of the organic pigments include azo-based, thioindigo-based, anthraquinone-based, anthanthrone-based, and triphenedioxazine-based pigments, vat dye pigments, phthalocyanine pigments, such as copper stalocyanine and its derivatives, and quinacridone pigments.

Examples of the dye include acid dyes, direct dyes, disperse dyes, oil-soluble dyes, and metal-containing oil-soluble dyes.

The content of the coloring material in the heat-softening coloring material layer is usually 5.
-90% by weight, preferably 10-70% by weight.

The types and amounts of the binder and coloring material in this heat-softening coloring material layer are determined so that the heat-softening coloring material layer has self-supporting properties, and based on other required physical properties. It can be formed by appropriately selecting a thermoplastic material and a thermoplastic material.

In addition to the above-mentioned components, the heat-softening coloring material layer also contains waxes, surfactants, higher fatty acid derivatives, higher aliphatic alcohols, higher aliphatic ethers, phosphoric acid esters, organic fillers, inorganic fillers, etc. It may contain additives.

The thickness of this heat-softening coloring material layer is such that it can be peeled off from the recording medium.
In addition, the thickness may be adjusted to such a value that thermal energy from the heat-softening coloring material layer side can be applied with good response, and the thickness is usually within the range of 0.5 to 10 μm, preferably 1 μm. ~5 gm.

(1) Transfer body (1) There are no particular restrictions on the transfer body in the method of the present invention, as long as the color material-containing layer can be once formed on the surface thereof and then the color material-containing layer can be transferred to the surface of the recording body. Various materials can be used in various forms.

Examples of materials for forming the transfer body include plain paper,
Papers such as capacitor paper, laminated paper, and coated paper; resin films such as polyethylene, polyethylene terephthalate, polystyrene, polypropylene, and polyimide; composites of paper and resin films; and metals such as aluminum foil, nickel, copper, and stainless steel. A sheet or the like is preferably used.

The form of the transfer body can be determined as appropriate depending on the use of the heat-sensitive recording material, and for example, any form such as a tape, sheet, or drum can be adopted.

When the transfer body is in the form of a tape or sheet, it is desirable that the transfer body be self-supporting.

Furthermore, when the recording medium is in the form of a sheet or tape that can be wound up into a roll, the back side of the recording medium (the opposite side on which the coloring material-containing layer is laminated)
It can also be used as a transfer body. When the recording body itself is used as a transfer body in this way, the heat-sensitive recording material of the present invention can be manufactured without using a separate member called a transfer body.

1. Method for producing a heat-sensitive recording material - The present invention provides a method for producing a heat-sensitive recording material that is capable of being peeled off from the recording material and that forms an image on the recording material by being peeled off from the recording material after imagewise heating. In manufacturing a heat-sensitive recording material formed by laminating coloring material-containing layers, first the coloring material-containing layer is laminated on the transfer body, and then the adhesiveness of the coloring material-containing layer itself is utilized or a newly provided adhesive layer is applied. or transfer the coloring material-containing layer onto the recording medium using an adhesive mordant layer, or laminating the coloring material-containing layer on the back side of the recording medium and winding it up into a roll. This is a method for producing a heat-sensitive recording material, in which the coloring material-containing layer is transferred onto the surface of a recording medium and rewound.

The method for producing the heat-sensitive recording material will be described below with reference to the drawings in the case where the coloring material layer has adhesiveness.

FIG. 882 is a process diagram showing a manufacturing method using a transfer body.

In FIG. 2, 11 is a transfer body wound into a roll; 12
is a coating liquid for a coloring material-containing layer. A colorant-containing layer coating liquid 12 or the like is applied onto the transfer body using, for example, a reverse roll coater, and the colorant-containing layer coating liquid is dried in the heating zone 13 to form a colorant-containing layer on the surface of the transfer body 11. A heat-sensitive recording material is manufactured by laminating the above.

Here, the coating liquid for the coloring material-containing layer can be obtained by dispersing components necessary for forming the coloring material-containing layer in a solvent.

The components necessary to form the coloring material-containing layer are as described in detail in the description of the coloring material-containing layer.

Examples of the solvent include acetone, methyl ethyl ketone (IIIEK), methyl isobutyl ketone (MT
BK), ketones such as cyclohexanone: alcohols such as methanol, ethanol, propanol, esters such as methyl acetate, ethyl acetate, butyl acetate, propyl acetate, ethyl lactate, ethylene glycol monoacetate, diethylene glycol dimethyl ether, 2-ethoxyethanol , tetrahydrofuran, dioxane, etc.; aromatic hydrocarbons, such as benzene, toluene, xylene; and halogenated hydrocarbons, such as methylene chlorite, ethylene chloride, carbon tetrachloride, chloroform, ethylene chlorohydrin, dichlorobenzene, etc. I can do it.

There is no particular restriction on the coating method, and lamination can be carried out by arbitrarily adopting any known coating technique such as a reverse roll coater method, an extrusion coater method, a gravure coater method, a wire bar coating method, etc.

The transfer body 11 dried in the heating zone 13 is
The transfer body 11 and the recording body 14 are superimposed on the surface of the coloring material containing layer formed on the surface of the transfer body 11 and the recording body 14 through the coloring material containing layer.
The layers are sent to the heating zone 15 while being superimposed, where the coloring material-containing layer is transferred to the recording medium 14 side.

By separating it from the transfer body 11, a heat-sensitive recording material 16 as a product is completed.

In addition, if the color material layer itself is a non-adhesive layer.

A separate adhesive layer may be provided or the adhesiveness of the surface of the recording medium may be used.

In the step, the temperature, residence time, etc. of the heating zones 13 and 15 can be appropriately selected depending on the constituent material of the colorant-containing layer to be transferred.

FIG. 3 is a process diagram showing a manufacturing method that does not use a transfer body.

In FIG. 3, 21 is a recording body, 22 is a coating liquid for a coloring material-containing layer, and 23 is a heating zone.

The coating liquid 22 for the coloring material-containing layer is applied to the back side of the recording medium 21 using a reverse roll coater or the like, and the coating liquid 22 is applied to the heating zone 1.
A coloring material containing layer is formed on the back side of the recording medium by drying the coating liquid for the coloring material containing layer in step 3.0 Next, the laminate 24 of the recording medium and the coloring material containing layer is coated, for example, with the coloring material containing layer on the outside. Wind it up into a roll so that it looks like this.

As a result, the laminate 24 wound up into a roll in the process shown in FIG. The surface of the recording body 21 is in contact with the surface of the coloring material-containing M26, and furthermore, the coloring material-containing layer 26 is formed on the back surface of the recording body 21,
Thereafter, in the same manner, the recording medium 21 and the coloring material-containing fj 26 are alternately stacked one on top of the other.

In this roll-shaped laminate, the coloring material-containing layer is exposed to the outside.

Therefore, the coloring material-containing layer on the outside of this roll-shaped product is removed by one turn. As a result, the back surface 34 of the recording medium 21 is exposed.

Then, when the laminate shown in FIG. 145 is rewound with the colorant-containing layer 26 and the recording medium 21 integrated, it becomes a sheet-like material of a heat-sensitive recording material in which the colorant-containing layer 26 is laminated on the surface of the recording medium 21. can get.

In this example, the laminate was manufactured in the form of a roll so that the coloring material-containing layer was on the outside, or the laminate may be wound up into a roll so that the recording medium was exposed on the outside.

In this case, the recording body exposed to the outside is removed by one round, and then the recording body and the coloring material-containing layer are integrally rewound.

In this case as well, there is no restriction on the coating technique using the transfer body as described above, and any of the various methods described above may be used.

The temperature and time of the heating zone are also the same as above.

As described above, without applying the coating liquid for the coloring material-containing layer directly to the surface of the recording material, with or without using a transfer material,
By transfer, it is possible to produce a heat-sensitive recording material having a coloring material-containing layer with a smooth surface and a uniform thickness on a recording medium.

[Example] Next, Examples of the present invention will be shown and the present invention will be explained in more detail.

(Example 1) On a polyethylene terephthalate film with a thickness of 84 m, a coating solution for a coloring material-containing layer prepared by dispersing the following composition in water was applied to a peeling support M (8 μm thick), a coloring material-containing layer ( 2#Lm
A film for transfer of a heat-sensitive recording material was formed by laminating the adhesive layer (IBm thickness) and the adhesive layer (IBm thickness) in this order to a predetermined thickness. This film was transferred to a recording medium made of glassine paper with a thickness of 754 m using the apparatus outlined in FIG.
A heat-sensitive recording material having a peeling support layer as a surface was prepared.

Nitrocellulose 95 parts by weight Silicone-modified acrylic resin 5 parts by weight Carbon black 20 parts by weight Paraffin wax 40 parts by weight Carnauba wax
30 parts by weight Ethylene-vinyl acetate copolymer resin IO parts by weight - Viscosity 1'' b4 1- 2-Ethylhexyl acrylate 70 parts by weight (emulsion) Vinyl acetate 30 parts by weight Acrylic #2 parts by weight , Thermal printer (260mm width, equipped with a line head, applied energy 25mJ/ms", pressure 7
An image was formed by applying thermal energy from the release support layer side of the heat-sensitive recording material.

As a result, peeling occurred between the colorant-containing layer and the adhesive layer, and an imagewise image in which the colorant layer remained imagewise on the adhesive layer was obtained.

(Example 2) A sealing layer (10xm
), a release layer (l←m>), and then a release support layer, a coloring material-containing layer, and an adhesive layer were laminated in this order so as to have the same layer structure and layer thickness as in Example 1, A transfer film for a heat-sensitive recording material was formed.

Eye clay 100 parts by weight SB latex 25 parts by weight Oxidized starch 25 parts by weight - "U1 Rekishi JL!
m Elsion-type silicone release agent 100 parts by weight (Toshi Silicone 517270) Catalyst (Toshi Silicone 5M7278) 20 parts by weight When this film was wound up using the device schematically shown in Figure 3, the glassine used initially was removed. A heat-sensitive recording material was obtained in which the peeling support layer was placed on the front side of the paper in the opposite order to the order of the layers.

匪E! Next, as in Example 1, a thermal printer was used to apply thermal energy to form an image. As a result, separation occurred between the coloring material-containing layer and the adhesive layer, and an image-wise image was formed on the adhesive layer. or obtained.

[Effects of invention The present invention has the following effects.

(1) Since the heat-sensitive recording material produced by the method of the present invention forms one color material layer on the recording medium by transfer, the selection of the recording medium, especially paper, is more extensive compared to the method of direct coating. I can do it. That is, there is no need to select the paper quality, and even so-called plain paper can be suitably used.

(2) In the method described in Item 2 of I, since the back side of the recording medium can be used as a transfer body, the transfer body can be omitted and the transfer device can be further simplified.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram for explaining the principle of the heat-sensitive recording material produced by this invention, FIGS. 2 and 3 are process diagrams showing the manufacturing method of this invention, and FIG. 4 is shown in FIG. 3. Cross-sectional view showing a roll-shaped laminate obtained by the method, No. 5
The figure is an explanatory view showing the state when the roll-shaped laminate is unwound. 1.14.21...Recording body (image forming layer), 26
--Coloring material-containing layer, 12.22--Coating liquid for coloring material-containing layer, etc., 13. Is, 23... Heating zone Figure 1 Figure 2 Figure 4

Claims (2)

[Claims] (1) A heat-sensitive recording layer formed by laminating a coloring material-containing layer on a recording body, which is peelable from the recording body and forms an image on the recording body by being peeled from the recording body after imagewise heating. A method for producing a heat-sensitive recording material, which comprises laminating a coloring material-containing layer on a transfer body and then transferring the coloring material-containing layer onto a recording body. (2) A thermosensitive recording layer formed by laminating a coloring material-containing layer on a recording body that is peelable from the recording body and forms an image on the recording body by peeling off from the recording body after imagewise heating. In producing the material, the colorant-containing layer is formed on the back side of the recording body, the layer is wound up, and the coloring material-containing layer formed on the back side of the recording body is transferred to the front side of the recording body and then rewound. A method for producing a heat-sensitive recording material.