JP2000318337A - Heat-sensitive stencil printing base paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a base paper of high resolution and of little white void defect, free from plate contact creases and provided with superior carrying properties by setting a contact angle with water on the film surface constituting a base paper at the specified value or larger and also setting the surface specific resistance thereof at the specified value or less. SOLUTION: The contact angle of a base paper with water on a thermoplastic resin film on the opposite side of a porous substrate is set at 70 deg. or larger, and the surface ratio resistance is set as 1×1013 Ω/(square) or less. As the thermoplastic film, preferably a polyester film composed of a polyester, its copolymer or a blend of them is used. The thickness of the film is preferably 0.1-5 μm. The porous substrate is preferably provided with ink passing-through properties and substantially not generating the deformation under heat under the condition of heat for perforating the film, and the substrate composed of polyester fibers is preferable. Its weight per unit area is preferably set as 1-20 g/m2 from the viewpoint of ink retention properties.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stencil sheet for heat-sensitive stencil printing which is perforated by a thermal head, a laser beam or the like. The present invention relates to a heat-sensitive stencil sheet having excellent properties.

[0002]

2. Description of the Related Art Thermosensitive stencil printing uses an ink-permeable porous support to which a thermoplastic resin film is attached as a base paper, and sends an image of a document read by a sensor as a digital signal to a thermal head. The thermal element of the head is heated to melt and melt the thermoplastic resin, thereby making perforation plate making, and extruding ink from the porous support side into the perforated portion to print on printing paper.

In recent years, heat-sensitive stencil printers have been strongly required to have high-speed plate making and high-definition printing. In response to these demands, improvements have been made to reduce the energy required for plate making of thermal heads and to increase the density of thermal elements in thermal heads, thereby realizing high-sensitivity, high-definition printing base paper. It has been demanded.

Conventionally, as a stencil sheet for heat-sensitive stencil printing, a stencil sheet having a structure in which a thermoplastic resin film such as polyester and a porous support made of a natural fiber or a synthetic fiber are bonded with an adhesive is known. For example, JP-A-57-1
No. 82495, JP-A-58-147396,
JP-A-59-2896, etc.).

However, when printing is performed at a high resolution using a conventional heat-sensitive stencil sheet, there are the following disadvantages. (1) When the plate making energy is reduced, the perforation of the film becomes insufficient, and the printed characters are chipped or the ruled lines are cut. (2) When the dot density is increased, the resolution is improved, but the white spot defect in the solid black portion becomes more conspicuous.

Therefore, in order to improve the drawback of the above (1), the melting point of the thermoplastic resin film constituting the base paper is reduced, the thickness of the film is reduced, or the heat of the film is reduced in order to increase the perforation sensitivity. Improvements have been made to increase the shrinkage. Further, in order to improve the defect of the above (2), for the purpose of increasing the ink permeability, the fiber diameter of the porous support constituting the base paper is reduced, the binding of the fibers is eliminated, and the basis weight is reduced. Has been improved. Also, for example, in Japanese Patent Application Laid-Open No. 4-232790, the amount of an adhesive used for bonding a film and a porous support is reduced as much as possible.
No. 2,128,91 discloses a method using no adhesive.
There has been proposed a heat-sensitive stencil sheet obtained by spraying synthetic fibers on one side of a film and thermocompression bonding. Further, as a method for resolving the disadvantages of the above (1) and (2) at once, JP-A-6-305273 and JP-A-7-186565.
Japanese Patent Application Laid-Open Publication No. H11-157, discloses that an unstretched polyester film and an unstretched polyester film are heat-bonded and then co-stretched to obtain a base paper. Since the base paper does not use an adhesive and the support fiber can be easily thinned and the basis weight can be easily reduced, the base paper has a feature that high-sensitivity printing with no white spot defect and high-definition printing can be performed. . However, it has been found that the base paper has problems that fine wrinkles occur in the base paper at the time of plate formation after plate making and that the running property in the printing press is poor.

[0007]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the conventional heat-sensitive stencil printing paper, and provides a high-resolution heat-sensitive stencil which has few defects in white spots and has excellent transferability without plate-formation wrinkles. It is intended to provide a printing base paper.

[0008]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, by specifying the contact angle of water on the surface of the film constituting the base paper and the surface resistivity, the conventional art has been developed. We found that the shortcomings of the base paper could be improved,
The present invention has been completed.

That is, the present invention relates to a heat-sensitive stencil printing paper comprising a thermoplastic resin film and a porous support, wherein the contact angle of water on the thermoplastic resin film side surface of the base paper is 70 degrees or more; And the surface resistivity of the surface is 1 ×
A heat-sensitive stencil sheet having a density of 10 ¹³ Ω / □ or less.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention provides a heat-sensitive stencil sheet which is excellent in transportability, has no white spot defects, has no wrinkles when the pre-plated base paper is formed, and has excellent transportability. As a result of intensive studies to provide the following, it has been found that such problems can be solved by setting the contact angle with water and the surface resistivity of the surface of the base paper on the thermoplastic resin film side to a specific range. is there.

The base paper used in the present invention has a contact angle with water of 70 ° on the surface of the thermoplastic resin film opposite to the porous support.
It is important that the surface resistivity is not less than 1 ° C. and the surface specific resistance is 1 × 10 ¹³ Ω / □ or less. Preferably, the contact angle with water is 7
The surface resistivity is 5 ° or more and the surface resistivity is 5 × 10 ¹² Ω / □ or less, more preferably the contact angle with water is 80 ° or more and the surface resistivity is 5 × 10 ¹¹ Ω / □ or less. If the contact angle with water is less than 70 degrees, fine wrinkles are generated on the base paper during plate making, and wrinkles are likely to be generated when the base paper after plate making is applied, which is not preferable. In addition, the surface resistivity is 1 ×
If it exceeds 10 ¹³ Ω / □, it is not preferable because the base paper becomes difficult to travel smoothly during transportation.

Examples of the thermoplastic resin film in the present invention include films composed of polyester, polyamide, polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, copolymers thereof, blends thereof, and the like. Is polyester,
A polyester film comprising the copolymer or a blend thereof is used. As the polyester, a polyester containing an aromatic dicarboxylic acid, an aliphatic dicarboxylic acid, or an alicyclic dicarboxylic acid and a diol as main components is preferable.

Here, as the aromatic dicarboxylic acid component, for example, terephthalic acid, isophthalic acid, phthalic acid,
1,4-naphthalenedicarboxylic acid, 1,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, 4,
4'-diphenyldicarboxylic acid, 4,4'-diphenyletherdicarboxylic acid, 4,4'-diphenylsulfonedicarboxylic acid and the like can be used, and among them, terephthalic acid, isophthalic acid, 2,6-naphthalenedicarboxylic acid and the like are preferable. Can be used.

As the aliphatic dicarboxylic acid component, for example, adipic acid, suberic acid, sebacic acid, dodecanedioic acid and the like can be used, and adipic acid and the like can be preferably used.

The alicyclic dicarboxylic acid component includes
For example, 1,4-cyclohexanedicarboxylic acid or the like can be used.

These acid components may be used alone.
Two or more kinds may be used in combination, and further, an oxyacid such as hydroxybenzoic acid may be partially copolymerized.

As the diol component, for example, ethylene glycol, 1,2-propanediol, 1,3-
Propanediol, neopentyl glycol, 1,3-
Butanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 1,2-
Cyclohexane dimethanol, 1,3-cyclohexane dimethanol, 1,4-cyclohexane dimethanol,
Examples thereof include diethylene glycol, triethylene glycol, polyalkylene glycol, and 2,2'bis (4'-β-hydroxyethoxyphenyl) propane. Among them, ethylene glycol is preferably used. One of these diol components may be used alone,
More than one species may be used in combination.

The polyester used for the thermoplastic resin film of the present invention is preferably polyethylene terephthalate, a copolymer of ethylene terephthalate and ethylene isophthalate, polyethylene-2,6-naphthalate, polybutylene terephthalate, butylene terephthalate and ethylene terephthalate. A copolymer of butylene terephthalate and hexamethylene terephthalate, a copolymer of hexamethylene terephthalate and 1,4-cyclohexane dimethylene terephthalate, and a copolymer of ethylene terephthalate and ethylene-2,6-naphthalate A coalescence and a blend thereof can be used. Particularly preferably, a copolymer of ethylene terephthalate and ethylene isophthalate, polyhexamethylene terephthalate, hexamethylene terephthalate and 1,4-cyclohexane dimethylene terephthalate,
A copolymer of ethylene terephthalate and ethylene-2,6-naphthalate can be used.

The thermoplastic resin film of the present invention may contain, if necessary, an organic lubricant such as a flame retardant, a heat stabilizer, an antioxidant, an ultraviolet absorber, an antistatic agent, a pigment, a dye, a fatty acid ester, a wax, or a polyolefin. An antifoaming agent such as siloxane can be blended. Further, lubricity can be imparted as required.

The method of imparting lubricity is not particularly limited, but examples thereof include clay, mica, titanium oxide, calcium carbonate, kaolin, talc, inorganic particles such as wet or dry silica, alumina, zirconia, acrylic acids, and styrene. And the like, and a method using so-called internal particles for precipitating a catalyst and the like to be added during the polyester polymerization reaction.

The thermoplastic resin film according to the present invention comprises:
Those stretched in at least one axial direction are preferred.
More preferably, it is a biaxially stretched film. The stretching ratio is not particularly limited, but is preferably at least 2 times in each of the vertical and horizontal directions.

In the present invention, the thickness of the thermoplastic resin film is preferably from 0.1 to 5 μm, more preferably from 0.1 to 3 μm, and particularly preferably from 0.1 to 2 μm.

The melting point of the thermoplastic resin film in the present invention is preferably 230 ° C. or lower, more preferably 220 ° C.
° C or lower, particularly preferably 210 ° C or lower. When two or more peaks of the melting point as measured by the differential scanning calorimeter are present, it is preferable that at least one peak temperature is 230 ° C. or lower. The lower limit of the melting point of the thermoplastic resin film is preferably 130 ° C. or more from the viewpoint of film forming stability.

The crystal melting energy of the thermoplastic resin film of the present invention is preferably 5 to 50 J / g, more preferably 10 to 40 J / g.

The porous support in the present invention is preferably a material having an ink-passing property, which does not substantially undergo thermal deformation under heating conditions for perforating a film, and has a good ink retaining property and uniform dispersibility. A porous material such as papermaking paper, nonwoven fabric, screen gauze or the like made from natural fibers, synthetic fibers, inorganic fibers, metal fibers and the like can be preferably used.
Among them, those made of synthetic fibers are preferable, and those made of polyester fibers are more preferable in that the fiber diameter and the basis weight can be arbitrarily set. In addition, other fibers may be used in combination as long as the effects of the present invention are not impaired.

The polyester used for the polyester fiber has an aromatic dicarboxylic acid, an aliphatic dicarboxylic acid or an alicyclic dicarboxylic acid and a diol as main components. Preferably, polyethylene terephthalate, polyethylene-2,6-naphthalate, poly-1,
4-cyclohexane dimethylene terephthalate, a copolymer of ethylene terephthalate and ethylene isophthalate, and the like can be used.

The fiber diameter of the porous support of the present invention is 0.5
It is preferably within a range of from 20 to 20 µm, more preferably from 1 to 15 µm, particularly preferably from 1 to 10 µm.
In addition, the fiber diameter referred to in the present invention means a diameter when the fiber is viewed perpendicularly from a plane formed by the base paper. The cross-sectional shape of the fiber is not particularly limited, and any cross-sectional shape can be used.

[0028] Porous basis weight of the support in the invention, from the viewpoint of the ink retention properties, is preferably from 1 to 20 g / m ^2, more preferably 1 to 15 g / m ^2, and most preferably, 1 to 12
g / m ² .

The fibers constituting the porous support of the present invention may contain, if necessary, flame retardants, heat stabilizers, antioxidants, ultraviolet absorbers, antistatic agents, pigments, dyes, fatty acid esters, waxes, etc. Organic lubricants or antifoaming agents such as polysiloxane may be blended, and if necessary, chemical treatment of the fiber surface with acid or alkali or corona treatment to impart affinity with the ink. , Low-temperature plasma treatment or the like.

The thermoplastic resin film of the present invention and the porous support may be adhered using an adhesive or may be adhered without using an adhesive.

The method for controlling the contact angle of the thermoplastic resin film surface with water and the surface resistivity of the surface of the base paper of the present invention within the scope of the present invention may be any method.
It is particularly preferred to form a thin layer comprising petroleum wax or vegetable wax, modified silicone oil and antistatic agent. The thickness of the thin layer is 0.005 μm or more and 1.0 μm or less, and more preferably 0.01 μm or more and 0.1 μm or less.
5 μm or less.

As the petroleum wax, paraffin wax, microcrystalline wax, oxidized wax and the like can be used. Among them, oxidized wax is preferred.

As the vegetable wax, candela wax, carnauba wax, wood wax, bayberry wax,
Osocury wax, esparto wax, raffia wax, sugar cane wax and the like are used, and a composition comprising the following compounds is preferred. That is, {rosin or disproportionated rosin, or hydrogenated rosin, α, β-substituted ethylene (α-substituent: carboxyl, β-substituent: hydrogen, methyl or carboxyl) additive} alkyl or alkenyl (each having 1 to 1 carbon atoms) 8) Ester additives of poly (repeating units: 1-6) alcohols are particularly preferred.

Examples of the modified silicone oil include long-chain alkyl-modified silicone oil, polyether-modified silicone oil, carbinol-modified silicone oil, amino-modified silicone oil, epoxy-modified silicone oil, carboxyl-modified silicone oil, mercapto-modified silicone oil, and methacryl-modified silicone oil. Silicone oil or the like can be used. Among them, amino-modified silicone oil, carboxyl-modified silicone oil, alcohol-modified silicone oil, and epoxy-modified silicone oil are particularly preferable.

As the antistatic agent, an alkyl ammonium salt is preferable, and among them, an alkyl ammonium sulfonate compound is preferable. The alkylammonium may be any as long as it has at least one alkyl group, and preferably has a hydroxyalkyl group in addition to the alkyl group. For example, tetraalkylammonium, tetrabutylammonium, triethylhydroxyethylammonium, tributylhydroxyethylammonium , Triethylhydroxybutylammonium,
Tributyl hydroxybutyl ammonium, diethyl hydroxyethyl ammonium, dibutyl hydroxyethyl ammonium, diethyl hydroxybutyl ammonium, dibutyl hydroxybutyl ammonium, ethyl trihydroxyethyl ammonium, butyl trihydroxyethyl ammonium, stearyl trihydroxyethyl ammonium, ethyl trihydroxybutyl ammonium, butyl Trihydroxybutylammonium, stearyltrihydroxybutylammonium and the like can be used. As the sulfonic acid, those having an alkyl group or an alkylaryl group are preferred, for example, hexylsulfonic acid, octylsulfonic acid, dodecylsulfonic acid, stearylsulfonic acid, hexylbenzenesulfonic acid, octylbenzenesulfonic acid, dodecylbenzenesulfonic acid. And stearylbenzenesulfonic acid.

In the base paper of the present invention, the above-mentioned thin layer is preferably applied in the form of a coating solution dissolved, emulsified or suspended in water or an organic solvent, followed by drying or removing the solvent. The coating may be performed at any stage before or after the stretching of the film. In order to make the effect of the present invention more remarkable, it is particularly preferable to apply before horizontal stretching in the case of sequential biaxial stretching such as horizontal stretching after longitudinal stretching, and before stretching in the case of simultaneous biaxial stretching. . The application method is not particularly limited, but application is preferably performed using a roll coater, a gravure coater, a reverse coater, a bar coater, or the like.

Before the thin layer is provided, if necessary, an activation treatment such as a corona discharge treatment may be applied to the coated surface of the film in air or other various atmospheres. <Method of measuring characteristics> (1) Contact angle (degree) A sample of 2 cm x 8 cm was cut out from the base paper, and water (Emisu Chemical Co., Ltd.) on the film surface was measured using a contact angle meter CA-D manufactured by Kyowa Interface Science Co., Ltd. (Purified water) was measured. The measurement was performed at five places of the sample, and the average value was obtained. (2) Surface specific resistance (Ω / □) A sample of 10 cm × 10 cm is cut out from the base paper,
Advantest R830 ULTRA HIGH RESISTA
The specific resistance of the film surface was measured using NCE METER. The measurement was performed on three samples, and the average value was obtained. The measurement environment was a temperature of 23 ° C. and a humidity of 65%. (3) Fiber diameter (μm) Photographs at a magnification of 2000 times were taken with an electron microscope at arbitrary 10 locations on the support side of the base paper, and 1 photograph was taken for each photograph.
Five fiber diameters were measured for a total of 150 fibers, and the average value was determined. (4) Weight (g / m ² ) The film was peeled from the base paper, cut into a size of 20 cm × 20 cm, weighed, and converted to the weight per m ² . (5) Film thickness (μm) Optical interference thickness gauge (HIT-25 manufactured by Toray Techno Co., Ltd.)
Was used to measure the film thickness at five locations in the width direction of the base paper, and the average value was determined. (6) Evaluation of printability The prepared base paper was supplied to a printing machine “Risograph” GR377 manufactured by Riso Kagaku Co., Ltd., and 20 sheets were printed under standard conditions using all solid originals. about,
The white spot defect was visually observed and determined as follows.

"◎" means no white spots, 1 to 5 white spots, "○" means 6 to 10 white spots, and "△" means 11 or more white spots. , “X”. "△" and above are practical levels. (7) Evaluation of plate-formability and transportability The prepared base paper is supplied to a printing machine “Risograph” GR377 manufactured by Riso Kagaku Kogyo Co., Ltd.
The plate was set on the plate cylinder. This operation was performed 30 times, and the following judgment was made. (Printing ability) "30" indicates that no wrinkle was generated on the base paper during 30 times, "O" indicates that one occurrence occurred in 30 times, and "△" indicates 30 times occurred twice. Among them, those that occurred three or more times were rated as "x". "△" and above are practical levels. (Transportability) “◎” indicates that no transport error occurred in 30 times, “○” indicates one transport error occurred in 30 times, “△” indicates 30 times error occurred in 30 times Those that occurred three or more times out of the 30 times were rated "x". "△" and above are practical levels.

[0039]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

Example 1 (Making of unstretched nonwoven fabric) A raw material of polyethylene terephthalate (intrinsic viscosity 0.51, melting point 254 ° C) was spun by a melt blow method and had a fiber diameter of 7.2 µm and an unstretched weight of 90 g / m ² . A non-woven fabric was produced. The crystallinity of the unstretched nonwoven fabric was 3%, and the birefringence was 0.002. (Film formation) Then, silica having an average particle size of 1.5 μm was added to 0.4
Wt% ethylene terephthalate-ethylene isophthalate copolymer (isophthalic acid 14 mol% copolymer,
Melting point 218 ° C, intrinsic viscosity 0.70) in an oven at 120
After pre-crystallization at 150 ° C., the film was dried under reduced pressure at 150 ° C. for 3 hours using a rotary dryer, extruded at a T-die die temperature of 270 ° C. using an extruder having a screw diameter of 40 mm, and cast on a cooling drum to obtain a thickness. A 20 μm unstretched film was produced.

By laminating the unstretched nonwoven fabric on the unstretched film and supplying the unstretched nonwoven fabric to a multi-roll longitudinal stretching machine, a peripheral speed difference is provided between a sixth roll and a seventh roll.
The film was stretched 3.5 times in the longitudinal direction.

Next, an aqueous solution consisting of 5 parts by weight of a mixed solution comprising the following components A, B and C and 95 parts by weight of water was dried on a film surface of the obtained laminated sheet using a metaling bar. Was applied so that the coating amount was 0.2 g / m ² .

A: candela wax B: amino-modified silicone oil C: triethylhydroxyethylammonium dodecylsulfonate
Heat to 5 ° C, stretch 3.8 times in the width direction, 140 ° C x 1
Heat treatment was performed for 0 seconds to prepare a heat-sensitive stencil printing base paper.

The film thickness of the obtained base paper is 1.5 μm.
m, the basis weight of the nonwoven fabric is 7 g / m ² , and the average fiber diameter is 4.3 μm.
m. In addition, the contact angle with water and the surface resistivity of the film side surface were as shown in Table 1.

Table 1 shows the results of evaluation of printability, plate-formability and transportability using this base paper. The printed matter printed using this base paper had few white spots and was excellent in both the plate-formability and the transportability. Examples 2 and 3 A heat-sensitive stencil sheet was prepared in the same manner as in Example 1, except that the mixing ratio of the components A, B and C was changed. The film thickness of the obtained base paper is 1.5μ.
m, the basis weight of the nonwoven fabric is 7 g / m ² , and the average fiber diameter is 4.3 μm.
m. The contact angle with water and the surface resistivity of the film-side surface were as shown in Table 1.

Table 1 shows the results of evaluation of printability, plate-formability and transportability using this base paper. The printed matter printed using this base paper had few white spots and was excellent in both the plate-formability and the transportability. Example 4 A heat-sensitive stencil sheet was prepared in the same manner as in Example 1, except that carnauba wax was used instead of candela wax as Component A. The film thickness of the obtained base paper was 1.5 μm, the basis weight of the nonwoven fabric was 7 g / m ² , and the average fiber diameter was 4.3 μm. The contact angle with water and the surface resistivity of the film-side surface were as shown in Table 1.

Table 1 shows the results of evaluation of printability, plate-formability and transportability using this base paper. The printed matter printed using this base paper had few white spots and was excellent in both the plate-formability and the transportability. Example 5 A heat-sensitive stencil sheet was prepared in the same manner as in Example 1, except that the component B was replaced with a carboxyl-modified silicone oil instead of the amino-modified silicone oil. The film thickness of the obtained base paper is 1.5μ.
m, the basis weight of the nonwoven fabric is 7 g / m ² , and the average fiber diameter is 4.3 μm.
m. The contact angle with water and the surface resistivity of the film-side surface were as shown in Table 1.

Table 1 shows the results of evaluation of printability, plate-formability and transportability using this base paper. The printed matter printed using this base paper had few white spots and was excellent in both the plate-formability and the transportability. Example 6 A heat-sensitive stencil sheet was prepared in the same manner as in Example 1, except that triethylhydroxyethylammonium dodecylbenzenesulfonate was used instead of triethylhydroxyethylammonium dodecylsulfonate for Component C. did. The film thickness of the obtained base paper was 1.5 μm, the basis weight of the nonwoven fabric was 7 g / m ² , and the average fiber diameter was 4.3 μm. The contact angle with water and the surface resistivity of the film-side surface were as shown in Table 1.

Table 1 shows the results of evaluation of printability, plate-formability and transportability using this base paper. The printed matter printed using this base paper had few white spots and was excellent in both the plate-formability and the transportability. Comparative Example 1 A heat-sensitive stencil sheet was prepared in the same manner as in Example 1 except that no candela wax was used as a mixed liquid component. The film thickness of the obtained base paper was 1.5 μm, the basis weight of the nonwoven fabric was 7 g / m ² , and the average fiber diameter was 4.3 μm. The contact angle with water and the surface resistivity of the film-side surface were as shown in Table 1.

Table 1 shows the results of evaluation of printability, plate-formability and transportability using this base paper. The printed matter printed using this base paper had little white spots, but had poor printing properties and poor transportability. Comparative Example 2 A heat-sensitive stencil sheet was prepared in the same manner as in Example 1, except that the amino-modified silicone oil was not used as the mixture component. The film thickness of the obtained base paper is 1.5 μm, the basis weight of the nonwoven fabric is 7 g / m ² ,
The average fiber diameter was 4.3 μm. The contact angle with water and the surface resistivity of the film-side surface were as shown in Table 1.

Table 1 shows the results of evaluation of printability, plate-formability and transportability using this base paper. The printed matter printed using this base paper had little white spots, but had poor printing properties and poor transportability. Comparative Example 3 A heat-sensitive stencil sheet was prepared in the same manner as in Example 1 except that triethylhydroxyethylammonium dodecylsulfonate was not used as the mixture component. The film thickness of the obtained base paper is 1.5μ.
m, the basis weight of the nonwoven fabric is 7 g / m ² , and the average fiber diameter is 4.3 μm.
m. The contact angle with water and the surface resistivity of the film-side surface were as shown in Table 1.

Table 1 shows the results of evaluation of printability, plate-formability and transportability using this base paper. The printed matter printed using this base paper had few white spots, but was poor in both the plate-formability and the transportability. Comparative Example 4 A heat-sensitive stencil sheet was prepared in the same manner as in Example 1 except that the mixed solution was not applied to the film surface. The film thickness of the obtained base paper is 1.5 μm,
The basis weight of the nonwoven fabric was 7 g / m ² , and the average fiber diameter was 4.3 μm. The contact angle with water and the surface resistivity of the film-side surface were as shown in Table 1.

Table 1 shows the results of evaluation of printability, plate-formability and transportability using this base paper. The printed matter printed using this base paper had many white spots, and was poor in both the plate-formability and the transportability. Comparative Example 5 A heat-sensitive stencil sheet was prepared in the same manner as in Example 1, except that the mixed solution was applied to the nonwoven fabric side instead of the film surface. The film thickness of the obtained base paper was 1.5 μm, the basis weight of the nonwoven fabric was 7 g / m ² , and the average fiber diameter was 4.3 μm. The contact angle with water and the surface resistivity of the film-side surface were as shown in Table 1.

Table 1 shows the results of evaluation of printability, plate-formability and transportability using this base paper. The printed matter printed using this base paper had good transportability, but had many white spots and poor plate-formability.

[0055]

[Table 1]

In Examples 1 to 6, since the contact angle of the film surface with water was 70 ° or more and the surface resistivity was 1 × 10 ¹³ or less, the printability was good and the Excellent plate and transportability. On the other hand, in Comparative Examples 1 to 5, plate wrinkles occurred and transport troubles occurred.

[0057]

According to the heat-sensitive stencil printing paper of the present invention, the contact angle of the film surface with water is 70 ° or more and the surface resistivity is 1 × 10 ¹³ or less. Good in printability and transportability, and high quality printing is possible.

Continued on front page F-term (reference) 2H114 AB23 AB24 BA05 BA06 BA10 DA56 DA73 DA76 EA00 EA02 EA04 FA01 4F100 AA20H AH06H AJ11H AK01A AK41A AK41B AK52 AL06 AT00B BA02 BA07 DG01B DG15B DJ00B GB90 HBA JA00

Claims (5)

[Claims] In a heat-sensitive stencil printing paper comprising a thermoplastic resin film and a porous support, the contact angle of water on the surface of the base paper of the thermoplastic resin film with water is 70 ° or more, and A heat-sensitive stencil sheet having a surface resistivity of 1 × 10 ¹³ Ω / □ or less. 2. The heat-sensitive stencil printing paper according to claim 1, wherein the thermoplastic resin film is a polyester film. 3. The thermoplastic resin film has a thickness of 0.1 to 5
The heat-sensitive stencil sheet according to claim 1 or 2, wherein the thickness of the stencil sheet is .mu.m. 4. The base paper for heat-sensitive stencil printing according to claim 1, wherein said porous support is made of polyester fiber. 5. The heat-sensitive stencil sheet according to claim 1, wherein the basis weight of the porous support is 1 to 20 g / m ² .