JPH0764129B2 - High-sensitivity, heat-sensitive perforating base paper manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] In the present invention, a support is laminated on one of the main layers of a co-stretched film comprising a main layer (M layer) and another easily peelable layer. After that, the present invention relates to a method for producing a high-quality, high-sensitivity, heat-sensitive perforating base paper for peeling and removing other layers, and the use thereof is not particularly limited, but as a preferred example, thermal head, L
The present invention relates to a method for producing various base papers suitable for punching plate making base papers for ED arrays, laser heads, etc. or information recording base papers.

[Conventional technology]

Conventionally, when a functional thin film is used for laminating with a support layer, for example, a wide film having a thickness of about 1 (μm) and a width of 1000 mm is scratched, wrinkled, tarumi,
It was extremely difficult to uniformly laminate it on a support or the like without defects such as distortion (uneven tension) and breakage, and it resulted in a marked decrease in yield. Furthermore, the control of a small amount of the adhesive when laminating it with the support and the control of the uniformity are directly influenced by the situation of the film,
The coating amount was likely to be non-uniform. When the above-mentioned drawbacks are caused, for example, when thin paper, gauze (mesh-like material), uneven mount, etc. are laminated as the support, the surface of the above-mentioned functional thin film becomes remarkably non-uniform, and wrinkles, tarmi, curls This may cause a phenomenon or peeling of the joint surface. In addition, uneven adhesion of the adhesive will occur. Conventionally, using high-energy region flashing means such as infrared irradiation, flashing with a xenon lamp,
Heat the above-mentioned part of the original that shows the character image with ink, toner, etc. that absorbs the light rays that are overlapped by pressing strongly on the film surface, heat is transferred to the film surface, the film is melted and holes are opened. A printing original plate for making a plate was known. As the perforated plate-making film, for example, a film in which polyethylene terephthalate having a thickness of about 2 (μm) is drawn, sufficiently heat-treated and crystallized (crystallinity: about 45%) is known. These materials have sufficient heat resistance and good dimensional stability, and since they perforate in a high energy region, the above problems have not been so much demanded. Further, they have a problem that they are not effectively perforated in the case of the perforation means in the low energy region. Therefore, recently, thermal heads, etc., which have minute heating elements (eg, 10 to 16 dots / mm) that are used in large quantities in various printers, word processors, facsimiles, etc., which are in the direction of digitalization, are miniaturized. Research on high speed and low energy has been especially advanced. In the case of plate making using these thermal heads, there is a current demand for a film with high sensitivity and high resolution and a base paper using the film. In that case, you need a film with high sensitivity and high resolution that has never been seen before.
Optimization of the support to be used by laminating with the film and the situation of the base paper depending on the laminating method (described above)
However, it becomes important next.

Conventionally, for example, Japanese Patent Application Laid-Open No. 60-89396 has proposed a method of laminating a single thin film on a support while bringing the film surface into close contact with a mirror roll.

[Problems to be solved by the invention]

However, such conventional techniques require handling of the film itself, expensive laminating equipment, complicated methods, a clean environment, etc., and also have to consider static electricity countermeasures. A material having a low (elastic modulus), particularly a thinner region (for example, 1 μm or less) has various problems and is particularly difficult. In particular, it has been a conventional practice that the unevenness of the support is adhered as it is expressed on the film surface by the pressing when laminating the support, and the micro smoothness is lost.

The present invention provides a method for producing a high-sensitivity, heat-sensitive pierceable base paper that solves the above-mentioned problems.

[Means for solving problems]

That is, the present invention provides (A) a polybutene-1 polymer or an ethylene polymer in which a bleedable additive is added to a main layer (M layer) made of a thermoplastic resin having a crystallinity of 30% or less. At least one layer of the composition containing (B layer) or another layer (B layer or A / B layer) comprising the (B layer) and a layer of a propylene polymer (A layer) is the main layer (M). Layer) to the other layer (layer B)
Are stacked so that they are adjacent to each other, and the respective layers are melted by an extruder,
The film obtained by co-extrusion and stretching is wound into a roll, and the main layer (M layer) having a thickness of 0.5 to 18 μm and another layer (B layer or A / B layer) having a thickness of at least 5 μm are formed. And (B) after adhering a separately prepared support to the main layer (M layer) of the above-mentioned base paper film, another layer (B layer or A / B layer)
And a step of peeling the base material.

As a stretched film composed of a thermoplastic resin having a crystallinity of 30% or less that constitutes the main layer of the present invention, the tensile modulus is at least 75 (kg / mm ² ), and a preferable value is 10
0 kg / mm ² ), and more preferably 125 (kg / m ² ) as well.
m ² ), and more preferably 150 (kg / mm ² ). If the value is below the lower limit of this value, the stiffness of the film tends to be insufficient, the operability as a base paper (after lamination), the elongation when peeling off other layers or the backing paper, the damage, the deformation due to the pressure during plate making , Perforation sensitivity / resolution, self-supporting plate (with a thickness of 6 to 18 (μm)) that has the image and characters consisting of the film by peeling the backing paper, and the elongation in the printing process, etc. Tendency (measurement is
According to ASTM D882-67, 100% stress at 2% elongation
Shall be converted to and displayed). Next, the shrinkage stress value is at least 75 (g / mm ² ) and the preferable value is 100 to
It is 1200 (g / mm ² ) and more preferably 150 to 1000 (g / mm ² ). This value was obtained by sampling the film into strips with a width of 10 mm, setting it in a chuck with a strain gauge without loosening it to 50 mm between the checks, and immersing it in silicon oil heated to each temperature to generate the stress generated. Was obtained by detecting If the silicone oil temperature is 100 ° C or lower, the value after 10 seconds after immersion, and if it exceeds 100 ° C, the value after 5 seconds is adopted. In the case of uniaxial stretching, the average value in the stretching direction is used, and in the case of preferable biaxial stretching, the average value in the horizontal and vertical directions is used. It is within the scope of the invention if the above values include some of the values of the measured shrinkage stress curve for each temperature. The above preferable value is that the measurement temperature is expressed in the range of 60 to 150 (° C),
More preferably, this range is 60 to 140 (° C), and even more preferably 70 to 130 (° C). The lower limit of the heating stress value is a basic characteristic required for effectively generating perforations, which will be described in the case of one of the above-described preferable application examples. Below that, for example, the thermal head method effectively perforates holes. It becomes difficult to do things. On the other hand, if the preferable conditions are exceeded, the openings tend to be widened and the film tends to be distorted, and as a result, the resolution of the image / character after printing tends to decrease. If the lower limit of the expression temperature range is set, the dimensional stability of the film is lowered, the perforation resolution is lowered, and if the upper limit is exceeded, the perforation sensitivity is lowered. Next, the heat shrinkage rate is at least 30 (%), and this value is
It is preferably 35 to 90 (%), more preferably 40 to 80
(%). This value is obtained by placing a 50 mm square film sample in a constant temperature bath set to a predetermined temperature, treating it for 10 minutes in a freely shrinking state, then determining the amount of shrinkage of the film, and dividing it by the original size. The same as the case of the above stress. The above values are preferably
It is expressed in the range of 60 to 170 (° C), and more preferably, this range is 65 to 140 (° C).

When the value of the heat shrinkage ratio is not more than the lower limit, as described in the example of the preferable application described above, effective perforation is stopped and the sensitivity is lowered. Above the preferable upper limit, the resolution tends to decrease due to enlargement of holes and distortion. On the other hand, if the expression range is below the lower limit, the dimensional stability tends to decrease, the resolution tends to decrease, and if it exceeds the upper limit, the perforation sensitivity tends to decrease.

The film thickness of the main layer is 0.5 to 18 (μm),
Preferably 1 to 15 (μm), more preferably 1 to 13 (μm)
m). Below the lower limit, not only will there be problems in handling, but there will also be problems in strength, and problems will occur practically. As an example of a preferable application, the case of making a plate by the thermal head method will be described. At the time of perforation, tearing will occur, the resolution will decrease, and at the upper limit, effective perforation will tend to occur.

The thermoplastic resin constituting the film is preferably a copolyester resin, more preferably a low crystalline / amorphous copolyester, and further preferably a substantially amorphous copolyester. is there. For example, when an alcohol component is to be copolymerized, these include propylene glycol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol as a component to be copolymerized in addition to ethylene glycol. , Neoventil glycol, polyethylene glycol, polytetramethylene glycol, cyclohexane dimethanol or other known diols or the above ethylene glycol is not contained in the case of not containing the above ethylene glycol, There are cases where at least one of the above-mentioned other components is included.

Next, when copolymerizing the acid component, in addition to terephthalic acid,
There are isophthalic acid, phthalic acid, other aromatic compounds, and dicarboxylic acids having a substituent on the aromatic ring that does not contribute to the esterification reaction. It may also contain at least one dicarboxylic acid selected from aliphatic dicarboxylic acids such as succinic acid, adipic acid, etc., or other known ones. Either one of the alcohol component and the acid component may be used, or both may be used in a timely manner. An example of a preferable combination is, for example, a copolymer containing ethylene glycol as a main component and 1,4 cyclohexanedimethanol at 40 mol% or less and a copolymer using terephthalic acid as an acid component.
In that case, a more preferable ratio of copolymerization is 20 to 40 mol% of 1,4-cyclohexanemethanol, and further preferably 25
It is about 36 mol%. Of these, those having a crystallinity as a raw material of about 30% or less are preferable.

Next, for polyamide resins, the so-called nylon-6,66,6
-10,11,12, Copolymer nylon-6-66,6-66-610,6-6
There are 6,612, etc. Of these, a copolymer system is preferable. In addition to these, there is also one obtained by copolymerizing a component having an aromatic ring. As those having an aromatic ring, there are terephthalic acid, isophthalic acid, fumaric acid, and those having a substituent which does not contribute to the polymerization reaction in the nucleus thereof. Among the above-mentioned copolymers, the aromatic ring is an example having a rigid portion in terms of molecular structure, but there are other hydrocarbon-containing saturated cyclo rings having many branches or those having a polar group. These are preferable because they have the effects of lowering the crystallinity and improving the elastic modulus. The upper limit of the copolymerization of these is 30 mol%, preferably 20 mol% or less. However, it goes without saying that a film that satisfies the above-mentioned film characteristics at the same time is selected.

Next is an ethylene-vinyl alcohol copolymer, the preferred ethylene content of which is 20 to 50 mol%. More preferably, it is 30 to 45 mol%. Alternatively, 40% by weight of the copolymer is at least one polymer or copolymer selected from nylon resin ester resin and ionomer resin.
The composition and the like are modified (mixed) below.

Next, a polycarbonate-based resin, preferably 5 to 40% by weight of a polymer capable of being formed into a film by mixing with another type, such as one using a monomer such as having a lowered softening point or one obtained by copolymerizing the same There are mixed products.

Next, a copolystyrene resin, such as an acrylonitrile, an acrylate ester, a diene resin, etc., is available as a copolymer component. Acrylic acid esters are preferred.

Next, in addition to the above, an acrylic resin, a vinyl chloride resin, a vinylidene chloride copolymer resin, or the like may be used, or any other suitable resin may be used. Moreover, even if a mixture of other kinds of polymers, an additive, a plasticizer, an auxiliary agent, a dye, or a light absorbing substance, a substance having a small specific heat, a substance having a good thermal conductivity, etc. is mixed, It should be something that meets the requirements. The Bicatt softening point (expressed as VSP) measured according to ASTM D-1525 (load 1 kg, heating rate of 2 ° C / min) is 40 to 150 (° C) in the final composition, preferably 50 to 1
A temperature of 30 (° C), more preferably 60 to 120 (° C), is preferable when utilizing a high level of drilling performance. Is it amorphous?
A low crystalline polymer is preferable, but a crystalline resin that can be made into a low crystalline state (the degree of crystallinity is 30% or less) depending on the processing conditions should be one that can satisfy the above-mentioned characteristics. . For example, these include polyethylene terephthalate. However, the above-mentioned amorphous one is preferable.
Further, the main layer may be not only a single layer but also a multilayer functional film.

Next, the other layer may be at least one layer, which is an easily peelable layer made of a polyolefin resin, and may be one layer selected from the following (A layer and B layer). In that case, the layer B is preferable. However, it is preferably composed of at least two layers (A layer and B layer). The layer B is mainly composed of an ethylene polymer or a known copolymer having a Vicatt softening point (VSP) of 100 (° C) or less and a crystallinity (by DSC method) of 60 (%) or less, or polybutene- It is mainly composed of a 1-system polymer or copolymer. These may be a mixed composition with another kind of thermoplastic resin (in the range of 50% by weight or less).

Among these, preferably, the above ethylene-based polymer, a composition mainly comprising the same copolymer, and an ethylene-α olefin elastomer copolymer added thereto in an amount of 5 to 50% by weight, or a polypropylene-based polymer further added thereto. The composition of the above both is 5 to 50% by weight per 100 parts by weight, and the former is mainly composed of ethylene-vinyl acetate copolymer (vinyl acetate group content 5 to 25% by weight). This is the case.

These not only have good stretchability by themselves, but also have the effect of greatly improving the stretchability of the other layers (in this case, the main layer and the layer A described later). It also has the effect of preventing the occurrence of necking stretching of the other layer (same as above) during stretching. In addition, during co-stretching, there is an appropriate interlayer adhesion, and there is no stretching strain due to the difference in the resins that make up each layer (strains that occur because the stretching conditions are different for each single layer), and conversely the optimal stretching The conditions spread and the synergistic effect of more stabilizing as a whole is exhibited. As a result, stretching characteristics (strength characteristics, etc.) of all layers
Not only does it improve, but especially the drawing effect of the main layer finally used as the functional layer is remarkably improved.

The other layer has an excellent effect of protecting the main layer from the outside, and it may be less likely to take special consideration such as dust and scratches such as in a clean room. Further, the limit of the crystallinity of the B layer is related to the stretchability, the bleeding property of the additive, and the mixing property.

Next, the important point is that various additives can be effectively contained in the B layer, and further these can be effectively transferred to the main layer in an extremely thin film form. Normally, the surface treatment of a thin film is extremely difficult to perform by a post-treatment method because of its uniformity, and an expensive process is required. The amount of additive that can bleed to the surface of the main layer is 0.
2 to 5% by weight, and the types are nonionic surfactants such as esters of fatty acids and polyhydric alcohols, polyoxyethylene alkyl ethers, higher alcohols, waxes, fluorine-based and silicon-based surfactants. There are additives, etc. that have special functions and meet individual purposes. These may be used according to the purpose.

After co-stretching, these effectively and quickly bleed to the main layer side,
It can be easily peeled off and can be taken online without aging, and the main layer alone can be wound up at high speed without damage. Peel strength was measured with a tensile tester at a speed of 200 mm / min, and both pieces were peeled up and down, and the stress per 1 cm width was also determined. This value is less than 2 (g / cm width),
It is preferably 1 (g / cm width) or less. It is particularly convenient when adding a 1: 1 mixture of oleic acid monoglyceride and polyglycerin monooleate in an amount of about 0.5 to 2.5% by weight, in order to impart peelability, antistatic property and lubricity, and to achieve high-speed peelability. It was good.

It is important that the arrangement of the B layer is adjacent to at least one of the main layers, and the thickness of the one layer is usually 3 to 100 (μ
m), preferably 5 to 50 (μm), and more preferably 5 to 20 (μm). The lower limit is limited by the peeling property, the stretchability, the protective property, and the transferability of the additive, and the upper limit is limited by the economical efficiency and the coextrusion property.

Next, the other one (layer A) is composed of a layer of a propylene polymer and has a Vicat softening point of at least 100 ° C., preferably 110 ° C., more preferably 120 ° C., and the lower limit is mainly due to heat resistance. Limited. The flexural modulus is at least 75 (Kg / mm ² ) and preferably 85 (Kg / mm ² ). This lower limit is limited by the operability when combined with the B layer (measurement conforms to ASTM D790). The propylene-based polymer of the present invention includes homo-type and copolymer-type ones, or other polymers such as polybutene-1 may be mixed in the range of 40% by weight or less. Further, it is convenient that at least one surface is disposed adjacent to the above-mentioned layer B, and preferably at least one surface layer of all layers is formed, and the thickness thereof is not particularly limited, but generally 1 to 50 (μm ), Preferably 2
-30 (μm), more preferably 2-20 (μm).
The lower limit is limited by the strength, peeling property, handleability (waist, scratch resistance), stretchability, heat resistance, etc. of the other layers, and the upper limit is limited by stretchability.

The layer A, together with the layer B, also serves as a barrier layer effective in preventing a large amount of the additive added to the phase B from bleeding to the surface layer. It is also stiff and has a protective effect.

Further, the other layers (A and B layers) separated from the main layer in a later step can be reasonably recovered and recycled.
In that case, the composition can be used as a part of the B layer, which is rational and convenient in terms of composition.

The production method of these multilayer films may be a known method, and preferably, it is co-stretched at least uniaxially at an area stretching ratio of 5 to 25 times under the condition that each layer is provided with sufficiently high orientation. It is preferable that both the vertical and horizontal are co-stretched biaxially at a rate of 2 to 5 times.

These multilayer films are not particularly limited and may be stretched with any combination of layers. It is a feature of the present invention that the main layer is preferably an inner layer, and one of the main layers is prepared by peeling and removing, and the support is effectively laminated on the side of the main layer that goes out to the surface. Alternatively, two or more main layers may be included at the same time and stretched to form a multilayer including one layer later. In the prepared multilayer film, one side of the M layer is a surface layer and the other side is the above-mentioned B layer, A layer, B layer / A layer, and other combinations, but preferably M / B / A. Each layer is sequentially laminated as described above. The support to be laminated next is selected as one that effectively allows ink to pass through during printing and does not substantially change due to heat during perforation. These include, for example, thin Japanese paper (weight per unit area: 5 to 15 g / m ² ), mesh screen woven fabric made of synthetic or natural cotton. Of these, in the latter case, for example, 50 to 500
The mesh is preferably about 70 to 300 mesh. Next, another relatively thick main layer (M layer), for example, 6 to
18μ is used, and a mount having convenient irregularities at the time of punching is used, and after plate making (punching), this is peeled off, a turn is formed by discontinuous dot-shaped holes, and information is put on it. There is the above-mentioned mount when using it for printing. This mount has a regular arrangement of minute irregularities, that is, protrusions, the shape of which is independent round shape, corner shape, elliptical shape, linear shape or continuous mesh shape,
Alternatively, some of these are randomly arranged. It is preferably a regular case, and the height of the convex portion is at least
15 (μm), preferably 25 (μm), more preferably 30 (μm). In the case of the above independent shapes, the size per unit is 2.5 x 10 ^{-5 to} 1.44 x 10 ^-2 (mm ² )
Is. Also, the effective area above the convex portion is 1 to 35 per unit area.
%. The convex portion becomes a portion easily laminated to the main layer (M layer). The convex portion may be made of the same material (for example, an embossed one) as that of the base material, for example, a sheet film, or may be another material (for example, a film sheet which is patterned by printing or a resist method).

Next, the adhesive is used by dissolving it in a solvent. Emulsion
A latex type, a hot melt type, a powder type, a reaction curing type and the like suitable for the purpose may be used by a usual method. The amount is 0.1-8, which is equivalent to the solid content.
(G / m ² ), preferably 0.3 to 5 (g / m ² ), more preferably 0.5 to 3 (g / mm ² ).

The coating method may be such that the above-mentioned support is laminated on the M layer side of the above-mentioned multi-layer film in a timely manner according to the purpose.
For example, a coating roll with a doctor knife is used to coat an appropriate amount of adhesive on the surface of the film, the surface of the support to be adhered, or both (film support), and drying, reaction, and cooling. It suffices to perform processing such as. Alternatively, they may be separately or separately coated and subjected to the same treatment, and then pressure-sensitively pressure-bonded at room temperature or under heating. After the above treatment, the other layer may be freely peeled off to obtain the base paper with the main layer remaining.

In the base paper according to the production method of the present invention described above, the above-mentioned support is selected according to the purpose, and after laminating the specific multilayer film according to the purpose, the layers other than the main layer of the multilayer film are peeled and removed. Needless to say, the feature is that it is extremely uniform, that is, it is excellent in smoothness, wrinkles, dust, scratches, distortion due to uneven film elongation and tension, and easy to apply adhesive evenly. , High quality (especially excellent sensitivity and resolution) base paper can be obtained. Also, by transferring from another layer, the surface of the base paper film can be subjected to lubricity treatment, antistatic treatment and the like at the same time. In addition, the cost at the time of lamination is kept low, and its merit is large. Also, the peeled other layer can be recovered and reused.

〔The invention's effect〕

・ The punching sensitivity of the base paper can be expressed at a high level as the film's potential.

・ The resolution of the base paper can be increased.

・ Uniform and especially microscopically smooth without curling of the base paper, peeling with the film, dust, scratches, etc. can be made.

-It is possible to uniformly laminate a film of about 0.5 to 1 (μm), which is usually difficult to laminate.

・ Good productivity during lamination.

・ It can be done uniformly and rationally by peeling the other layers after laminating the surface treatment of the base paper (eliminating the absurdity caused by the post-treatment process).

(Examples) Examples will be shown below, but the present invention is not limited thereto.

Example 1 As a main layer (M layer), each monomer mainly composed of an acid component terephthalic acid and an alcohol component mainly composed of 1,4 cyclohexane-dimethanol: 30 mol% and ethylene glycol: 70 mol% Consisting of a substantially amorphous copolyester (VSP: 82 ℃, density: 1.27 (g / cm ³ ), intrinsic viscosity: 0.7
5), and as the other layer, the B layer is an ethylene vinyl acetate copolymer (containing vinyl acetate group: 10% by weight, melt index 1.0, VSP: 81 ° C, mP: 95 ° C): 70% by weight, ethylene −
α-olefin polymerized elastomer (Density: 0.88 (g / c
m ³ ), melt index: 0.44, amorphous, VSP: 40 ℃ or less): 15% by weight, crystalline polypropylene, (density: 0.90
(G / cm ³ ), melt flow rate: 7VSP: 138 ℃, flexural modulus: 110 (kg / mm ² ), mP: 143 ℃, 4% by weight of ethylene random copolymerization): 15% by weight Mixture (VSP: 7
A composition containing 2% by weight of a mixed additive having a mixing ratio [2: 1] of oleic acid monoglyceride and diglycerin monooleate as an additive.
Next, as the A layer, the same polypropylene as described above is used, melted in each extruder, and extruded into each layer arrangement [A / B / M / B / A] from an annular multilayer (5 tank) die, Then, it was rapidly cooled and solidified to obtain a tube-shaped original fabric. This is heated to 90 ° C in a [heating zone] between two pairs of differential niprols, and in the same atmosphere, a [stretching zone] (under a multi-stage hood).
Then, the biaxial stretching was carried out simultaneously at a stretching ratio of vertical: 4.1 times, horizontal: 4.0 times, and cooled in an air of 20 ° C. in a [cooling zone] to stretch in a bubble shape. The ears (both ends) of the obtained film were slit and wound into a roll on a winder as two films.
Immediately when this product was peeled from the other side and the M layer, it could be peeled smoothly and could be peeled without breaking even at a speed of 80 m / min. In that case, the peel strength was about 0.8 (g / cm) width. Further, the peeling of the A layer and the B layer was impossible. The thickness (μm) of the obtained multi-layered film was [3/8/5/8/3] when expressed in the above order. The A / B layer on one side was peeled off smoothly from this film to obtain a roll-wound film having a winding length of 500 m as an M / B / A layer structure. The film of the obtained main layer has a tensile breaking strength of 19.3 (kg / mm ² ), a tensile breaking elongation of 85%, a tensile elastic modulus of 250 (kg / mm ² ), and a shrinkage stress value of 480 (g / mm ² ). It is the peak value at 85 ° C. The heat shrinkage ratio was 76 (%) at 80 ° C.

Next, even when the main layer (M layer) was stretched to a thickness of 0.7, 2.12 (each μm), the stretchability was good and stable operation was possible. Almost no breakage occurred due to puncture, the peelability between the main layer and the other layer was good, and the properties were close to the above values, and both were within the preferred range. For the purpose of comparison, an attempt was made to stretch the main layer alone.
At 7,2,5 (μm), it broke and could not be stretched at all. 12
(Μm) makes it easy to flatten, and only a film having a length of 10 to 20 m and a poor thickness deviation was obtained. Also, there were many scratches, dust, wrinkles, etc. on the surface, and the surface was mirror-like and could not be wound properly without slipping. Also, it tends to block in a few days.

Next, obtain a film with a thickness of 2/8/3 (each μm) with the above-mentioned M / B / A layer structure, and dry the adhesive that dissolves the vinyl acetate adhesive with a coating device having a doctor blade. And then 3 (g /
An amount of m ² ), which was coated on the M layer side, was overlaid with 150 mesh of a polyester mesh (diameter of 45 μm) as a support, pressure-bonded, dried, and wound into a roll. After that, the other layer (B / A) was easily peeled off to make a smooth and uniform base paper (R
un No1) Next, when a film with the above-mentioned M layer of 2 (μm) peeled off was used for comparison (Comparison Run1), a commercially available polyethylene terephthalate film: the characteristic value of this product was about 47%. At mp260 ℃, the shrinkage stress value was 200 ℃, the peak value was 195 (g / mm ² ), 180 ℃ was 40 (g / mm ² ), and it was not measured below 150 ℃. Also, the shrinkage rate is 2 to 3 at 170 ° C.
(%), 180 ° C, 4 (%), 220 ° C, 20 (%). When using this (Comparative Run2), I tried to coat it in the same way, but wrinkles tended to occur and a stronger tension. Finally, it was laminated in the same manner while being applied in the length direction and the width direction. However, wrinkles, coating unevenness of the adhesive, breakage, and distortion are likely to occur, and they do not have excellent uniformity. Also, in both Comparative Runs 1 and 2, the unevenness of the support is likely to be transferred to the film surface, and even if it looks like a flat initially, the base paper is likely to curl and unevenness will occur later. It was Next, by using these obtained base papers Run1, Comparative Run1, and Comparative Run2, a personal word processor having a serial type thermal head having a matrix printing density of 24 dots (equivalent to about 8.1 dots / mm) is commercially available. , A plate making (piercing) test was performed at a printing speed of 20 characters / sec. As a result, Run 1 could be effectively drilled using the drilling energy adjustment dial [MiNi: 10mj / mm ² ]. In Comparative Run 1, the base paper film surface has irregularities, and contact unevenness of the thermal head, shrinkage unevenness in microscopic portions, shrinkage stress unevenness, and the like occur. In addition, it seems that there is coating unevenness of the adhesive, and the sensitivity and resolution are low, and a good image could not be obtained. For comparison Run2, the dial [Ma
x: 30mj / mm ² ], but it was not possible to drill effectively.

Then, using the resist method, at a height of 40μ, between 150 mesh, 2
Create a sheet-like pattern with a regular diameter of 0μ and a base material with a thickness of 50 (μm). With this as a mount, M / B / A is 10/8/3 (each μm). ) Layered film (Run
No. 2) and a 10μ film consisting of a single polymer layer of M layer (comparative Run 3) were coated with UV-curable adhesive on the convex part of the mount to a thickness of about 2μ by the method described above. The base paper was obtained by stacking it on a film, pressing it, and curing it. Run2's ones, when peeling other layers,
The film surface was excellent in smoothness, but the comparative Run 3 was likely to have unevenness, wrinkles, etc., and the adhesive was likely to have an uneven amount. Then, even in the punching test with the above word processor (the backing was peeled off after punching), Ru
The n2 base paper had sufficient energy perforation at its energy level [Max] and high sensitivity, and the printed image had high resolution. On the other hand, in Comparative Run 3, the perforation was insufficient even at the same energy level [Max], and only a non-uniform image could be obtained. When I printed it, it was blurred, and it was not very high resolution. Further, when further observed with a microscope, the image of Run 2 had a dot-shaped perforation in which a bridge made of a substantially uniform polymer was formed.
In the image of n3, the place to be drilled is not well drilled,
The bridging had enlarged cut holes, or the hole was insufficient as a whole (a condition in which the sensitivity of the film was insufficient).

In addition, with a drum type automatic inking type automatic printing machine, at a printing speed of 100 sheets / second, even if about 1000 sheets are printed, Run2 does not have any character loss, high resolution and clear printed matter. Was obtained. In comparison, Run 3 was originally worn out and could only print inadequately, but even then, letters were missing in some places and a void phenomenon occurred.

Claims (1)

[Claims] 1. A polybutene-1 polymer or an ethylene polymer in which a bleedable additive is added to (A) a main layer (M layer) made of a thermoplastic resin having a crystallinity of 30% or less. A layer of the composition containing (B layer) or another layer (B layer or B layer) and another layer (B layer or) of the propylene polymer (A layer).
At least one layer (A / B layer) was superposed on the main layer (M layer) so that the other layer (B layer) was adjacent to each other, and each layer was melted by an extruder and coextruded and stretched. The film is wound into a roll and the main layer (M layer) having a thickness of 0.5 to 18 μm and the other layer having a thickness of at least 5 μm (B layer or
A step of obtaining a base paper film consisting of A / B layer), and (B) after bonding a separately prepared support to the main layer (M layer) of the base paper film, another layer (B layer or A / B layer) layer)
A process for producing a high-sensitivity, heat-sensitive perforating base paper, which comprises a step of peeling the base paper.