JP2002029171A - Heat-sensitive stencil paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid droplet containing a light-to-heat conversion material discharged from a liquid discharge device, which keeps a perfect circular shape with little variation on a thermoplastic resin film, has a small spread, and is adjacent to a liquid droplet. The present invention provides a heat-sensitive stencil sheet suitable for high resolution by improving the heat-sensitive stencil sheet so that the sheets can be fixed without mutual interference and coalescence [Solution] A heat-sensitive stencil provided with a thermoplastic resin film In the stencil paper, the base paper is provided with a light-to-heat conversion material holding layer on at least one surface, and the light-to-heat conversion material holding layer is made of a polymer mixture of polyvinylpyrrolidone and styrene / (meth) acrylic acid polymer. Is 0.01 to 20
Heat-sensitive stencil paper characterized in that it has a thickness of μm. The mixing ratio of polyvinylpyrrolidone and styrene / (meth) acrylic acid polymer is preferably from 99: 1 to 50:50.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-sensitive stencil sheet having a surface on which a light-to-heat conversion material holding layer is provided.

[0002]

2. Description of the Related Art Conventional stencil printing methods for heat-sensitive stencils are as follows: (1) A heat-sensitive stencil sheet is superimposed on a handwritten or ready-made manuscript or a toner image manuscript copied by electrophotography, and a flash lamp, an infrared lamp, etc. (2) A method in which a character portion or an image portion of a document is heated by the light of the original to melt and perforate the thermoplastic resin film in contact therewith. (2) The heat in contact with the thermal head using a thermal head that generates heat in accordance with image information There is a method of melting and perforating a plastic resin film.

However, in the plate making method (1),
Poor adhesion between the thermoplastic resin film of the heat-sensitive stencil sheet and the original as the heat source for perforation may cause poor perforation, or dirt on the surface of the original or toner in the non-image area may absorb heat, and perforate unexpected parts to perforate printed matter. A so-called pinhole phenomenon, which becomes dirty, occurs. In the case of the plate making method (2), since the thermal head and the thermoplastic resin film are perforated in contact with each other, perforations on the surface of the thermal head or the thermoplastic resin film may cause poor perforation, or the thermal head may be damaged. There have been problems such as occurrence of a sticking phenomenon in which the plastic resin film is thermally fused.

In order to solve such a problem, Japanese Patent Laid-Open No.
JP-A-99664 discloses a method in which a light-to-heat conversion material contained in a liquid is transferred together with the liquid onto a heat-sensitive stencil sheet from a liquid discharger, and then the light-to-heat conversion material is selectively irradiated with visible light or infrared light to selectively transfer the portion. A method of making a heat-sensitive stencil sheet characterized by perforating a stencil sheet has been proposed.

This plate making method comprises a first step of discharging a liquid containing a light-to-heat conversion material from a liquid discharge device onto a heat-sensitive stencil sheet to transfer the light-to-heat conversion material, and a step of transferring a visible light to the heat-sensitive stencil sheet to which the light-to-heat conversion material has been transferred. A second step of irradiating light or infrared light to perforate the portion where the photothermal conversion material has been transferred.

According to this plate making method, there is no need to bring the original and the heat-sensitive stencil sheet into contact with each other, so that there is no perforation defect or stain on the printed material as in the plate making method (1). Further, since the light-to-heat conversion material is attached to the thermoplastic resin film, a perforation defect due to unevenness of the thermal head or the surface of the thermoplastic resin film as in the plate making method (2) does not occur.

In such a plate making method, the state of the liquid containing the light-to-heat conversion material transferred onto the thermoplastic resin film has a great influence on the image quality when printed. In other words, if the liquid is discharged from the liquid discharge device and transferred onto the thermoplastic resin film and then spreads or spreads on the film, the perforation diameter becomes large and distorted, and the perforated portion is formed during stencil printing. A large amount of ink is transferred to the printing medium in a distorted shape, and as a result, the image of the printed matter becomes blurred and unclear. On the other hand, if the affinity between the liquid and the thermoplastic resin film is poor, the liquid is repelled on the film. In this case, the liquid is hardly fixed on the film, and the drying time of the liquid is delayed. When drilling in this state,
A large amount of energy and time are required, and the perforated shape becomes intermittent, and as a result, the image of the printed matter becomes unclear and has low density.

In recent years, high resolution has been required for printed images, and a thermal stencil printing using a thermal head has achieved a resolution of 600 dpi. JP 9
The plate making method described in -99664 is no exception, and a higher-resolution printed image is required, and the interval between countless droplets transferred onto the thermoplastic resin film is reduced, It became necessary to increase the resolution. For this reason, it is necessary to fix the droplets stably on the heat-sensitive stencil sheet without causing adjacent droplets to interfere with each other and coalesce.

In order to satisfy these performances, it has been proposed to form a photothermal conversion material holding layer on the surface of a thermoplastic resin film. For example, JP-A-9-277487
In the publication, a light-heat conversion material holding layer composed of a hydrophilic resin and a water-repellent compound is proposed.

[0010]

SUMMARY OF THE INVENTION However, Japanese Patent Application Laid-Open
In the combination of the substances described in JP-A-277487, the bleeding and spreading of the droplets are completely suppressed, and even in the case of high resolution, adjacent droplets do not interfere with each other and coalesce, so that distortion and It cannot be said that there is sufficient performance to suppress the occurrence of bleeding around the droplet.

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the prior art described above, and a droplet containing a light-to-heat conversion material discharged from a liquid discharge device is formed on a thermoplastic resin film into a perfect circular shape with little variation. An object of the present invention is to provide a heat-sensitive stencil sheet which is suitable for high resolution by improving the heat-sensitive stencil sheet so that it can be fixed without adhering without adhering and adhering the adjacent droplets to each other. .

[0012]

According to the present invention, an object of the present invention is to provide a heat-sensitive stencil sheet comprising a thermoplastic resin film, the base sheet having a light-to-heat conversion material holding layer on at least one surface, and The conversion material holding layer is achieved by a heat-sensitive stencil sheet comprising a polymer mixture of polyvinylpyrrolidone and a styrene / (meth) acrylic acid polymer and having a thickness of 0.01 to 20 μm.

According to the present invention, a photothermal conversion material comprising a mixture of polyvinylpyrrolidone and a styrene / (meth) acrylic acid copolymer is provided on at least one surface of a heat-sensitive stencil sheet provided with a thermoplastic resin film. Since the holding layer is provided, by transferring the liquid containing the photothermal conversion material to the holding layer, bleeding and spreading of the liquid are suppressed, and the liquid droplets adjacent to each other are maintained in a state of maintaining a perfect circular shape with little variation. Can be fixed to the base paper without interfering with each other.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The heat-sensitive stencil sheet of the present invention basically comprises a thermoplastic resin film, but may be constituted by a thermoplastic resin film alone. Alternatively, a porous support may be laminated on a thermoplastic resin film. Lamination of the thermoplastic resin film and the porous support can be performed by a method such as an adhesive or heat fusion. Further, the light-to-heat conversion material holding layer of the present invention is provided on at least one surface of the heat-sensitive stencil sheet, but is typically provided on at least one surface of the thermoplastic resin film. When a porous support is laminated on a thermoplastic resin film, the holding layer is usually provided on the surface of the film opposite to the porous support. The light-heat conversion material holding layer is composed of a mixture of polyvinylpyrrolidone and a styrene / (meth) acrylic acid copolymer.

As specific examples of the polyvinylpyrrolidone used in the present invention, in particular, those synthesized by radical polymerization of N-vinyl-2-pyrrolidone produced by a Reppe reaction and commercially available polyvinylpyrrolidone can be used. . The average molecular weight of polyvinylpyrrolidone is 10,
000 or more, more preferably 160,
000 or more is good. Commercially available polyvinylpyrrolidone includes, for example, "Rubiscor K series" manufactured by BASF, "PVP K series" manufactured by ISP.

Preferred specific examples of the styrene / (meth) acrylic acid copolymer used in the present invention include a copolymer of styrene or a styrene derivative and acrylic acid or methacrylic acid. Further, a terpolymer containing a third monomer may be used. Here, examples of the styrene derivative include styrene derivatives such as methylstyrene, dimethylstyrene, trimethylstyrene, α-chlorostyrene, and α-methylstyrene in addition to styrene. Examples of the third monomer include olefins such as ethylene, propylene and butylene, vinyl halides such as vinyl chloride and vinyl fluoride, vinyl esters such as vinyl acetate, and (meth) such as alcohol esters of (meth) acrylic acid. Other examples include monomers copolymerizable with styrene and (meth) acrylic acid, such as acrylic acid esters. The method of copolymerization is not particularly limited, and those having various copolymerization ratios are easily available from the market and can be used.

In the present invention, the polymerization ratio of the styrene / (meth) acrylic acid copolymer is preferably styrene / (meth)
Acrylic acid having a molar ratio of 1/2 to 10/1, and more preferably 1/1 to 5/1. In the case of a terpolymer, the third monomer may be contained in a proportion of up to about 50 mol% of the total monomers.

The styrene / (meth) acrylic acid copolymer is available in various molecular weights and can be used in the present invention.

The polymer mixture used in the present invention is a mixture of the above-mentioned polymers. This mixture dissolves well in dimethylformamide, dimethylacetamide, dimethylsulfoxide, cellosolve solvents, water and alcohol. Therefore, a solution of a polymer mixture can be obtained by dissolving polyvinylpyrrolidone and a styrene / (meth) acrylic acid copolymer in such a solvent and mixing them. More preferred solvents are water / alcohol mixtures.

The mixing ratio of polyvinylpyrrolidone and styrene / (meth) acrylic acid copolymer varies depending on the type of liquid containing the photothermal conversion material, and can be appropriately selected by those skilled in the art according to the type. Generally 99:
1 to 50:50, preferably 80:20 to
It is in the range of 70:30. When the mixing ratio of the polyvinylpyrrolidone and the styrene / (meth) acrylic acid copolymer is within the above range, the droplets of the liquid containing the light-to-heat conversion material discharged from the liquid discharge device spread and spread on the thermoplastic resin film. The droplets adjacent to each other are stably fixed independently of each other without interfering with each other and uniting while maintaining their shapes.

By mixing the styrene / (meth) acrylic acid copolymer with the polyvinylpyrrolidone, the droplets of the liquid containing the photothermal conversion material are absorbed by the hygroscopic action of the polyvinylpyrrolidone and at the same time, the styrene / (meth) acrylic acid is absorbed. By the effect of the copolymer, it is prevented from spreading more than necessary. However, the mixing ratio of polyvinylpyrrolidone and styrene / (meth) acrylic acid copolymer is 50: 5.
From 0 to 0: 100, the adjacent droplets cannot maintain their shapes stably, causing distortion in the shape of the droplets or bleeding around the droplets. The hole diameter becomes distorted and the printed image becomes unclear.

The thickness of the photothermal conversion material holding layer of the present invention is as follows:
It is preferably in the range of 0.01 to 20 μm, preferably 0.05 to 10 μm. When the thickness is 0.01 μm or less, it is insufficient to fix the liquid containing the discharged photothermal conversion material, and when the thickness is 20 μm or more, a large amount of heat energy is required when perforating the heat-sensitive stencil sheet, and it takes time for plate making. However, the cost is increased, which is not desirable.

The light-to-heat conversion material holding layer can be formed, for example, by coating the surface of a heat-sensitive stencil sheet with the above polymer mixture dissolved in a solvent or water. As a coating method, known coating means, for example, a bar coating method, a roll coating method, a blade coating method, an air knife coating method, a gravure coating method, a die coating method, and the like can be used.

Examples of the porous support used in the present invention include natural fibers such as manila hemp, mulberry, mitsumata, pulp and Japanese paper, synthetic fibers such as polyester, vinylon, nylon and acetate, metal fibers and glass fibers. Thin paper, nonwoven fabric, screen gauze and the like used alone or in combination may be mentioned.

The basis weight of these porous supports is 1 to 20 g.
/ M ² is preferred, more preferably 5 to 15 g /
It is in the range of m ^2. If it is less than 1 g / m ² , the strength as a base paper will be weak, and if it exceeds 20 g / m ² , the ink permeability during printing may be poor. Further, the thickness of the porous support is preferably in the range of 5 to 100 μm, more preferably in the range of 10 to 50 μm. If it is less than 5 μm, the strength as a base paper is still weak, and if it exceeds 100 μm, the ink permeability during printing may be poor.

The thermoplastic resin film used in the present invention only needs to be perforated by heating during plate making.
Examples thereof include polyolefin films such as polyethylene and polypropylene, polystyrene films, polyester films, polyvinyl chloride films, polyvinylidene chloride films, polyvinylidene fluoride films, and the like. The thermoplastic resin film is preferably a heat-shrinkable film such as a biaxially stretched film from the viewpoint of perforation sensitivity.

The thickness of these thermoplastic resin films is
0.5 to 50 μm is suitable, preferably 1 to 20 μm
Range. If the thickness of the film is less than 0.5 μm, its strength and handleability deteriorate, and if it exceeds 50 μm, a large amount of heat energy is required for perforation, so that the time required for plate making becomes long and costly.

As the adhesive used for bonding the thermoplastic resin film and the porous support, vinyl acetate,
Emulsion type such as acrylic type, vinyl chloride vinyl acetate copolymer type, polyester type, urethane type, polyamide type, etc., or solvent type, non-solvent type, hot melt type, light such as infrared ray, visible ray, ultraviolet ray and electron beam Curable type and the like can be mentioned.

The coating amount of the adhesive is 0.1 to 10.0 g / m
A range of ² is desirable. If the coating amount is less than 0.1 g / m ² , the adhesive strength is too weak and a delamination phenomenon occurs. On the other hand, if it exceeds 10.0 g / m ² , a liquid pool of the adhesive is generated between the fibers of the porous support and on the surface of the thermoplastic resin film, thereby impairing the ink passage property and perforating the thermoplastic resin film. In such a case, a large amount of heat energy is required, and there is a problem that the time required for plate making becomes longer and costs increase.

The light-to-heat conversion material used in the present invention may be any material that can convert light energy into heat energy, and is preferably a material having high light-to-heat conversion efficiency. For example, carbon black, lamp black, silicon carbide, carbon nitride, metal powder, metal oxide, inorganic pigment, organic pigment, organic dye and the like are preferable. Among the organic dyes, those exhibiting large light absorption in a specific light wavelength region, such as anthraquinone dyes, phthalocyanine dyes, cyanine dyes, squarylium dyes, and polymethine dyes, are preferred.

In the present invention, as the liquid containing the photothermal conversion material, water and / or a hydrophilic solvent can be used. In this case, when the liquid containing the light-to-heat conversion material is transferred to the light-to-heat conversion material holding layer, the liquid is absorbed by the hygroscopic action of polyvinylpyrrolidone and at the same time, unnecessarily due to the effect of the styrene / (meth) acrylic acid copolymer. Spreading is prevented, and the toner can be stably fixed on the thermoplastic resin film. Here, by irradiating the plate with visible light or infrared light, it is possible to obtain a desired character or image-shaped perforated portion on the heat-sensitive stencil sheet.

As described above, the light-to-heat conversion material holding layer provided on the surface of the thermoplastic resin film is composed of a mixture of polyvinylpyrrolidone and styrene / (meth) acrylic acid copolymer, so that the layer is transferred to the holding layer. Perforations with a perfect circle and a small spread corresponding to the shape of the photothermal conversion material can be obtained, and adjacent perforations do not unite with each other. Therefore, desired characters or images are faithfully reproduced on the heat-sensitive stencil sheet.

As the hydrophilic solvent, methyl alcohol,
Alcohol solvents such as ethyl alcohol, isopropyl alcohol and butyl alcohol, ethylene glycol,
Use glycol solvents such as diethylene glycol, triethylene glycol, propylene glycol, ethylene glycol dibutyl ether, diethylene glycol dibutyl ether, thioglycol, thiodiglycol, and glycerin, as well as hydrophilic solvents such as ketones, amines, and ethers. Can also. Examples of such ketone, amine and ether solvents include acetone, methyl ethyl ketone, tetrahydrofuran, 1,4-dioxane,
Examples thereof include 2-pyrrolidone, N-methyl-2-pyrrolidone, formaldehyde, acetaldehyde, methylamine, ethylenediamine, dimethylformamide, dimethylsulfoxide, pyridine, ethylene oxide and the like.

The liquid may further contain pigments, fillers, binders, curing agents, preservatives, wetting agents, surfactants, if necessary.
A pH adjuster or the like can be contained.

A light-to-heat conversion material can be appropriately dispersed or mixed in the above liquid to prepare a heat-sensitive stencil sheet making composition.

In the plate making method of the present invention, the heat-sensitive stencil sheet having a light-to-heat conversion material holding layer on its surface is used, and the heat-sensitive stencil sheet making composition comprising a light-to-heat conversion material and a liquid is heat-sensitive from a liquid discharger. The first step of discharging the photothermal conversion material onto the photothermal conversion material holding layer of the stencil paper and transferring the photothermal conversion material to the photothermal conversion material holding layer, and irradiating the thermosensitive stencil paper with visible light or infrared light to transfer the photothermal conversion material And a second step of selectively piercing the holes.

In the first step, for example, the liquid ejecting apparatus is moved in a non-contact state with respect to the heat-sensitive stencil sheet, and the liquid is ejected from the heat-sensitive stencil sheet according to the image information previously converted into an electric signal. The liquid ejecting apparatus is controlled so as to eject the light onto the light-to-heat conversion material holding layer, and an image is reproduced on the heat-sensitive stencil sheet as an adhered body of the light-to-heat conversion material.

As the liquid ejection device used in the present invention,
Nozzles having 10 to 2,000 openings per inch, slits, porous materials, porous films, etc.
A device connected to a heating element, a liquid feed pump, or the like, and intermittently or continuously discharging the liquid containing the photothermal conversion material in accordance with an electric signal of a character image is exemplified.

In the second step, when the heat-sensitive stencil sheet to which the light-to-heat conversion material has been transferred in the first step is irradiated with visible light or infrared light, the light-to-heat conversion material absorbs light and generates heat. The thermoplastic resin film and the light-to-heat conversion material holding layer are perforated by melting to form a plate. This irradiation with visible light or infrared light can be easily performed using a xenon lamp, a flash lamp, a halogen lamp, an infrared heater, or the like.

The heat-sensitive stencil sheet made by the above method can be used for general stencil printing. For example, a printed material can be obtained by placing ink on a perforated heat-sensitive stencil sheet, passing the ink through a portion perforated by pressing, depressurizing, squeegeeing, etc., and transferring the ink to superimposed printing paper. Printing inks include oil-based inks, water-based inks, and water-in-oil droplets (W / O) used in conventional printing.
Emulsion ink, oil-in-water (O / W) emulsion ink, hot-melt ink and the like can be used.

[0041]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, but it should be understood that the present invention is by no means restricted thereto.

Examples 1 to 4, Comparative Examples 1 to 3
1) Polyvinylpyrrolidone (trade name: PVP K-90, I
SP) (solvent: ethanol) and a styrene / (meth) acrylic acid copolymer (trade name: AP-267)
9 Showa Polymer) (10% solution (solvent: water)) were mixed at the weight ratio shown in Table 1 to obtain a coating liquid.

These coating solutions were applied to a 4.7 μm-thick polyethylene terephthalate film using a bar coater so that the film thickness after drying was 1.2 μm, and a light-heat conversion material holding layer was provided.

Next, on the opposite side of the light-to-heat conversion material holding layer of the film, a vinyl acetate adhesive was used so that the coating amount after drying was 2.0 g / m ² , and a 200 mesh polyester was used. The fibers were laminated.

[0045]

[Table 1]

Comparative Example 4 (Preparation of Coating Liquid 2) A mixed solution of 5 parts by weight of polyvinylpyrrolidone, 5 parts by weight of amino-modified silicone oil, 60 parts by weight of water and 30 parts by weight of isopropyl alcohol was prepared to obtain a coating liquid. Was.

This coating solution was applied to a 4.7 μm-thick polyethylene terephthalate film using a bar coater so that the film thickness after drying was 1.2 μm, and a light-heat conversion material holding layer was provided.

Next, on the opposite side of the light-to-heat conversion material holding layer of this film, a vinyl acetate adhesive was used so that the coating amount after drying was 2.0 g / m ² , and a 200 mesh polyester was used. The fibers were laminated.

Preparation of liquid containing photothermal conversion material 3 parts by weight of carbon black, 50 parts by weight of water, 10 parts by weight of ethylene glycol, N-methyl-2-pyrrolidone 37
The parts by weight were mixed according to a conventional method to obtain a liquid containing a photothermal conversion material.

Test Examples Using the heat-sensitive stencil sheets obtained in the above Examples and Comparative Examples, tests were performed by the following methods and evaluated. Table 3 shows the results.

(Evaluation 1) On the light-to-heat conversion material holding layer 1 of the heat-sensitive stencil sheet prepared in the examples and comparative examples shown in FIG.
A droplet 5 of a liquid containing a photothermal conversion material is ejected from a liquid ejection device 4 having a nozzle of 720 dpi as a character image so that dots are adjacent to each other, and as shown in FIG. Transferred as 6. The behavior of the droplet at this time was visually observed and evaluated according to the evaluation criteria shown in Table 2.

(Evaluation 2) Next, as shown in FIG. 3, a xenon flash 7 (SP275: made by Riso Kagaku Kogyo Co., Ltd.) with a light reflecting plate 8 is applied to the character image portion where the liquid 6 containing the light-to-heat conversion material transferred is fixed. As shown in FIG. 4, the light-heat conversion material holding layer 1 and the thermoplastic resin film 2 are melted by heat generated by the light-heat conversion material in the character image portion to form perforations 10 as shown in FIG. Was made. Thereafter, the obtained stencil printing paper was wound around a printing drum of a digital stencil printing machine (FR-295: manufactured by Riso Kagaku) to perform printing. The printed image at this time was visually observed and evaluated according to the evaluation criteria shown in Table 2.

Table 2 shows the criteria for the evaluation results.

[0054]

[Table 2]

Table 3 shows the evaluation results of Examples 1 to 4 and Comparative Examples 1 to 4.

[0056]

[Table 3]

When the liquid containing the light-to-heat conversion material is discharged to the light-to-heat conversion material holding layer on the heat-sensitive stencil sheet of Examples 1 and 2,
The adjacent droplet stably maintained its shape. When printing was performed by flash plate making in this state, a clear printed image was obtained, which was faithful to the image information. In Examples 3 and 4, a printed image having no practical problem was obtained.

When the liquid containing the light-to-heat conversion material is discharged to the light-to-heat conversion material holding layer on the heat-sensitive stencil sheet of Comparative Example 4, the fixation of the droplets to the light-to-heat conversion material holding layer is weak. The coalescence was generated by the interference of the droplets, and the image was intermittent. When printing was performed by flash plate making in this state, the printed matter became unclear with uneven density.

[0059]

According to the present invention, a light-to-heat conversion material holding layer is provided on the surface of a thermoplastic resin film of a heat-sensitive stencil sheet, and the light-to-heat conversion material holding layer is made of polyvinylpyrrolidone and styrene / polystyrene.
Since it is composed of a mixture with a (meth) acrylic acid copolymer, the droplets of the photothermal conversion material-containing liquid discharged from the liquid discharger onto the holding layer are kept in a perfect circular shape with little bleeding or spreading and little variation. In addition, the droplets adjacent to each other are fixed while maintaining their independent shapes without interfering with each other and uniting.

[Brief description of the drawings]

FIG. 1 is a side sectional view schematically showing a state in which a liquid containing a light-to-heat conversion material is discharged from a liquid discharge device toward a light-to-heat conversion material holding layer of a thermosensitive stencil sheet.

FIG. 2 is a side sectional view schematically showing a state in which a liquid containing a photothermal conversion material is transferred to a heat-sensitive stencil sheet.

FIG. 3 is a side sectional view schematically showing a state in which a light-sensitive stencil sheet to which a liquid containing a photothermal conversion material has been transferred is irradiated with a light beam.

FIG. 4 is a side sectional view schematically showing the state of a heat-sensitive stencil sheet made by irradiating a light beam.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Light-heat conversion material holding layer 2 Thermoplastic resin film 3 Porous support 4 Liquid ejecting device 5 Drop of light-heat conversion material-containing liquid 6 Transformed light-heat conversion material-containing liquid 7 Light source 8 Reflector 9 Light beam 10 Perforation

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H114 AB25 BA01 DA03 DA04 DA05 DA08 DA47 DA48 DA49 DA50 DA52 DA56 DA64 EA02 EA04 EA08 FA01 4F006 AA12 AA15 AA17 AA18 AA35 AB13 AB16 BA01 CA01 DA04 EA03 4J002 BC04X BJ00W GS00

Claims (2)

[Claims] 1. A heat-sensitive stencil sheet comprising a thermoplastic resin film, the base sheet having a light-to-heat conversion material holding layer on at least one surface, wherein the light-to-heat conversion material holding layer comprises polyvinylpyrrolidone and styrene / (meth) It is composed of a polymer mixture with an acrylic acid polymer and has a thickness of 0.01 to 20.
Heat-sensitive stencil paper characterized in that it has a thickness of μm. 2. The heat-sensitive material according to claim 1, wherein a mixing ratio of polyvinylpyrrolidone and styrene / (meth) acrylic acid polymer is in a range of 99: 1 to 50:50 in the polymer mixture. Stencil paper.