JPH06171247A - Ink release film, ink sheet for exposure pattern and pattern forming method - Google Patents

Abstract

PURPOSE:To simply form various patterns useful for forming a block copy for plate making on the surface of a transparent film without using any expensive silver salt photographic film or any expensive optical device. CONSTITUTION:An ink release film A wherein a sticking preventing layer 2 is provided on one surface of a base material film 1 and a heat seal layer 3 is provided on the other surface thereof is obtained and an ink sheet B for an exposure pattern wherein a hot-melt ink layer 6 with transmission density of 2.0 or more is provided on one surface of a transparent base material film 4 through a release layer 5 and the transmission density of the release part of the ink layer is 0.5 or less is obtained. Both sheets A, B are superposed one upon another so that the heat seal layer and the ink layer 6 are mutually opposed and heat is imagewise applied to both sheets from the rear surface of the ink release film A to imagewise release the hot-melt ink layer 6 of the exposure pattern ink sheet B.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a film for peeling ink,
More specifically, the present invention relates to an ink sheet for an exposure pattern and a pattern forming method, and more specifically, to various materials and a pattern forming method useful for producing a mask film, a negative film and the like useful for plate making for various printing.

[0002]

2. Description of the Related Art Conventionally, printing plates have been produced in various printing, but such plate making is carried out by a photomechanical process. At this time, various mask films, negative films, lith films, peeling films, etc. Was used in a large amount, and silver salt photographic films were mainly used as these film-making films, and various image formations were performed by an optical system.

[0003]

In the above prior art, the silver salt photographic film and various optical devices used have a huge number of prints and the cost thereof is not so conspicuous when a precise image is formed. When the number of sheets is hundreds to thousands, or in the case of simple printing that does not require high resolution, the cost is relatively high and it is very uneconomical.
There is a problem that it is difficult to handle at a small-scale printing place.
Accordingly, the object of the present invention is to solve the above-mentioned drawbacks and to form various patterns useful for preparing a master plate for plate making into a transparent film without using an expensive silver salt photographic film or an expensive optical device. It is an object of the present invention to provide a technique capable of easily forming on a surface.

[0004]

The above object can be achieved by the present invention described below. That is, the present invention relates to the base film 1
An ink peeling film A having a sticking prevention layer 2 on one surface and a heat seal layer 3 on the other surface, and a peeling layer 5 on one surface of a transparent substrate flume 4 The heat-meltable ink layer 6 has a transmission density of 2.0 or more, and the transmission density of the peeled portion of the ink layer is 0.5.
An exposure pattern ink sheet B characterized by the following, and the ink peeling film A and the exposure pattern ink sheet B are overlapped with the heat seal layer 3 and the ink layer 6 facing each other, The pattern forming method is characterized in that imagewise heat is applied from the back surface of the ink peeling film A to peel the heat-meltable ink layer 6 of the exposure pattern ink sheet B imagewise.

[0005]

[Function] A white image is formed by peeling off the ink layer imagewise from a transparent base film having a heat-meltable ink layer formed thereon, and when this is used as a negative film or a mask film, etc. The portion of the ink layer 6 remaining after being peeled off can sufficiently block the light from the light source, and a clear positive or negative image can be formed on the silver salt photographic film or photoresist layer. Such a negative pattern or the like can be easily formed by using, for example, a simple thermal transfer printer connected to a word processor, a computer or the like.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in more detail with reference to the preferred embodiments. A cross-sectional view of a preferred example of the ink stripping film A of the present invention is shown in FIG. 1a. The ink peeling film A of the present invention is characterized in that a suitable base film 1 has a sticking prevention layer 2 on one side and a heat seal layer 3 on the other side. As the base material film 1 used in the ink peeling film A in the present invention, the same base material film 1 as that used in the conventional thermal transfer film can be used as it is, and other materials can also be used. , Not particularly limited. Specific examples of the preferable base film 1 include:
For example, polyester, polypropylene, cellophane, polycarbonate, cellulose acetate, polyethylene, polyvinyl chloride, polystyrene, nylon, polyimide, polyvinylidene chloride, polyvinyl alcohol, fluororesin, chlorinated rubber, plastic such as ionomer, condenser paper, paraffin paper, etc. There are papers, non-woven fabrics, etc.
Further, the base film 1 in which these are combined may be used.
The thickness of the base film 1 can be appropriately changed according to the material so that its strength and thermal conductivity are appropriate, but the thickness is preferably 2 to 25 μm, for example.

The sticking prevention layer 2 formed on one surface of the base film mainly prevents adhesion of the thermal head 8 which is in contact with the base film at the time of image formation and improves the running property of the thermal head 8. The sticking prevention layer 2 itself is widely used in conventionally known thermal transfer sheets, and in the present invention, it may be the same as the conventional sticking prevention layer 2 and is not particularly limited. Further, the heat seal layer 3 formed on the other surface of the base film 1
As will be described later, is a heat-sensitive adhesive that adheres to the ink layer 6 of the exposure pattern ink sheet B at the time of heat to separate the ink layer 6 from the exposure pattern ink sheet B. Formed from an adhesive. Examples of such a heat-sensitive adhesive include ethylene-vinyl acetate copolymer (EVA), ethylene-acrylic acid ester copolymer (EEA), polyethylene, polystyrene, polyester, polypropylene, polybutene, petroleum resin, vinyl chloride resin. , Vinyl chloride-vinyl acetate copolymer, polyvinyl alcohol, vinylidene chloride resin, methacrylic resin, polyamide, polycarbonate, fluororesin, polyvinyl formal, polyvinyl butyral, acetyl cellulose, nitrocellulose, polyvinyl acetate, polyisobutylene, ethyl cellulose or polyacetal. Etc. are used, and those having a relatively low softening point conventionally used as a heat-sensitive adhesive, for example, a softening point of 50 to 80 ° C. are preferable. It is preferable that the heat seal layer formed of these materials usually has a thickness in the range of about 0.5 to 5 μm. The ink stripping film A as described above may be in the form of a continuous sheet, a sheet, or a tape-shaped serial ribbon used in word processors and personal computer printers.

Ink sheet B for exposure pattern of the present invention
As shown in FIG. 1B, the transparent substrate flume 4 has a heat-meltable ink layer 6 having a transmission density of 2.0 or more on one surface of the transparent substrate flume 4 via a release layer 5, and the ink layer 6 is peeled off. It is characterized in that the transmission density of the portion is 0.5 or less. The transparent substrate film 4 is preferably transparent to visible rays and ultraviolet rays, but when used as a negative film or a mask film, it is not always necessary to be transparent to visible rays. , May be colored as long as it is substantially transparent to ultraviolet rays of 300 to 400 nm. The transparent substrate film 4 is generally an ordinary transparent resin film, and examples thereof include a sheet or film of polyester, polypropylene, cellophane, polycarbonate, cellulose acetate or the like. The thickness of these transparent films is preferably in the range of 25 to 200 μm in terms of handling.

A peeling layer 5 formed on the surface of the base film.
Improves the peeling of the ink layer 6 formed thereon,
It has the function of making the transmission density of the film after peeling 0.5 or less (that is, the ink layer 6 does not remain). It is preferable that the peeling layer 5 is formed of a normal wax (containing no pigment) which is a material for forming the ink layer 6 described later. Although the thickness of the release layer 5 is not particularly limited, it may be generally in the range of about 0.1 to 5 μm. If the transparent substrate film is transparent and the release layer 5 is also transparent, the transmission density of the peeled portion of the ink layer 6 can easily be 0.5 or less. If the transmission density greatly exceeds 0.5, the exposure amount to a silver salt film, a photoresist or the like is reduced when used as a negative film or the like, which is not preferable.

The heat-meltable ink layer 6 formed on the surface of the release layer 5 is composed of a pigment and a vehicle, and various additives can be added if necessary. As the pigment, it is preferable to use a pigment having a great hiding property for light having a wavelength of at least 300 to 400 nm. As the vehicle, a mixture containing wax as a main component and other wax and a drying oil, a resin, a mineral oil, a derivative of cellulose, a rubber or the like is used. Typical examples of waxes include microcrystalline wax, carnauba wax, and paraffin wax. Further, various types of Fischer-Tropsch wax, various low molecular weight polyethylenes, wood wax, mirou, whale wax, ivowa wax, wool wax, shellac wax, candelilla wax, petrolactam, polyester wax, partially modified wax, fatty acid ester, fatty acid amide, etc. Wax is used. In the present invention, a thermoplastic resin having a relatively low melting point, for example, a heat sealing agent as described above is mixed in the above wax to improve the adhesiveness of the ink layer 6 to the heat sealing layer 3 with respect to the ink peeling film. Can be done. The wax and the thermoplastic resin are preferably used in a weight ratio range of 5 to 300 of the thermoplastic resin to 100 of the wax.

In the present invention, the transmission density of the ink layer 6 comprising the above pigment and vehicle must be 2.0 or more,
For this purpose, the relationship between the pigment concentration in the ink layer 6 and the thickness of the ink layer 6 is important. In order for the transmission density of the ink layer 6 transferred to the transfer material to be 2.0 or more in the ultraviolet region of 300 to 400 nm, carbon black as a pigment is used when the thickness of the ink layer 6 is 1.5 μm. The concentration needs to be about 30 to 50% by weight. When the transmission density is less than 2.0, when used as a mask film or the like, the light source light is insufficiently blocked and a clear and sharp latent image is not formed. Base film 1
Examples of the method for applying the hot-melt ink on the surface include hot melt coating, hot lacquer coating, gravure coating, gravure reverse coating, roll coating and many other means. The thickness of the ink layer 6 is about 1.0 to 2.0 μm when the carbon black concentration in the ink layer 6 is 40% by weight.

A protective layer 7 is preferably formed on the surface of the ink layer 6. The protective layer 7 has a function of preventing the ink layer surface from being scratched when the thermal head runs on the ink layer. The protective layer 7 is formed by applying a coating solution obtained by adding a carbon black, a latex having a high Tg or a filler to a thermoplastic resin such as a polyester resin having a good foil breakage when printing with a thermal head, a gravure coat and a direct coat. It can be formed by coating and drying. The thickness of the protective layer 7 is 0.1 to 0.3 g / m ² in a solid coating amount in an appropriate range. By adding carbon black also to the protective layer 7, the light shielding property of the ink layer 6 remaining after printing can be further improved. An example of the protective layer coating liquid is as follows. Polyester resin 60 parts by weight Carbon black 40 parts by weight Methyl ethyl ketone 100 parts by weight Toluene 100 parts by weight

In the pattern forming method of the present invention, as shown in FIG. 1c, the ink peeling film A and the exposure pattern ink sheet B are superposed with the heat seal layer 3 and the ink layer 6 facing each other. In addition, from the back surface of the ink peeling film A, for example, imagewise heat is applied by the thermal head 8 to peel off the heat-meltable ink layer 6 of the exposure pattern ink sheet B imagewise. It has a feature. In the pattern forming method of the present invention described above,
The ink peeling film A and the exposure pattern ink sheet B are set in, for example, a printer or a plotter,
After being conveyed by the arrow shown in FIG. 1c and printing is performed by applying heat onto the image with a thermal head 8 (flash exposure, a hot pen or the like may be used), the ink peeling film A is transferred to the transparent substrate film 4. By peeling, a desired negative pattern 9 is formed on the transparent substrate flume 4.

The pattern sheet thus formed is used as a negative film, a mask film, or the like, and visible light, preferably 30%, is applied to a light-sensitive material such as a silver halide photographic film or a light-sensitive paper.
A positive image can be formed on a silver salt photographic film by exposing it to ultraviolet rays of 0 to 400 μm. or,
By forming a photoresist layer on any substrate and similarly exposing it, a negative pattern or a positive pattern can be easily formed on the substrate according to the type of photoresist.

[0015]

EXAMPLES Next, the present invention will be described more specifically with reference to Examples and Comparative Examples. In the text, parts and% are based on weight unless otherwise specified. Example 1 (Preparation of Film A for Ink Removal) Thickness with anti-sticking layer provided on back surface 4.
A 5 μm polyethylene terephthalate film was used as a base film, and the following ink composition was applied to one surface of the base film by a gravure coating method at a solid content of 1.0 g / m ² to form a heat seal layer. An ink stripping film A of the present invention was obtained. Composition for heat-sealing layer : Polyester resin aqueous dispersion (solid content 34%, glass transition temperature 67 ° C) 10 parts Ethylene / butadiene copolymer latex (solid content 40%, glass transition temperature 22 ° C) 10 parts Water 10 10 parts isopropyl alcohol

Example 2 (Exposure pattern ink sheet B)
A 75 μm thick polyethylene terephthalate film was used as a transparent base film, and a carnauba wax aqueous dispersion (solid content 40%, melting point 83) was used as a release layer 5 on one surface of the film.
C.) at a rate of 0.7 g / m ² in solid content,
On top of that, the following ink layer composition was added in a solid content of 1.5 g /
m ² and coated on the surface as a protective layer 7 with the following protective layer composition in a solid content of 0.3 g / m ^2.
To obtain an ink sheet B for an exposure pattern of the present invention. Composition for ink layer : Aqueous dispersion of polyester resin (solid content 34%, glass transition temperature 67 ° C.) 30 parts Water dispersion type carbon black 70 parts Ethylene / butadiene copolymer latex (solid content 40%, glass transition temperature 22 10 parts water 25 parts isopropyl alcohol 25 parts protective layer composition; polyester resin water dispersion (solid content 34%, glass transition temperature 67 ° C.) 30 parts ethylene-butadiene copolymer latex (solid content 40%, glass) Transition temperature 22 ℃) 10 parts Water 25 parts Isopropyl alcohol 25 parts

Example 3 (Preparation of Film A for Ink Removal) Ink release film A of the present invention was used in the same manner as in Example 1 except that the following ink composition was used as the heat seal ink composition in Example 2. Got Composition for heat-sealing layer ; polyester resin aqueous dispersion (solid content 34%, glass transition temperature 67 ° C) 10 parts Ethylene / butadiene copolymer latex (solid content 40%, glass transition temperature 22 ° C) 10 parts Synthetic silica 1 part water 10 parts isopropyl alcohol 10 parts

Example 4 (Ink sheet B for exposure pattern)
Preparation) A polyethylene terephthalate film having a thickness of 100 μm was used as a transparent substrate film, and the following composition was coated as a release layer 5 on one surface of the film at a ratio of 0.7 g / m ² in solid content, and Then, the following ink layer composition was applied at a ratio of 1.5 g / m ² in terms of solid content to obtain an exposure pattern ink sheet B of the present invention. Composition for release layer 5 ; Carnauba wax aqueous dispersion (solid content 40%, glass transition temperature 83 ° C) 10 parts Polyethylene wax emulsion (solid content 40%, glass transition temperature 70 ° C) 10 parts Water 10 parts Isopropyl alcohol 10 parts Composition for ink layer : Aqueous dispersion of polyester resin (solid content 34%, glass transition temperature 67 ° C.) 20 parts Ethylene / vinyl acetate copolymer emulsion (solid content 55%, glass transition temperature 0 ° C.) 10 parts Water dispersion type Carbon black (solid content 30%) 80 parts Water 25 parts Isopropyl alcohol 25 parts

Comparative Example 1 (Exposure pattern ink sheet B)
A 75 μm thick polyethylene terephthalate film was used as a transparent base film, and a carnauba wax aqueous dispersion (solid content 40%, melting point 83) was used as a release layer 5 on one surface of the film.
C.) at a rate of 0.7 g / m ² in solid content,
In addition, the following ink composition was added at a solid content of 1.5 g / m ²
The coating was performed at a ratio such that an exposure pattern ink sheet B of Comparative Example was obtained. Composition for ink layer ; Carnauba wax emulsion (solid content 40%) 50 parts Ethylene / vinyl acetate copolymer emulsion (solid content 40%) 30 parts Water-dispersible carbon black (solid content 30%) 20 parts Water 10 parts Isopropyl 10 parts alcohol

Examples 5 to 8 and Comparative Example 2 (Pattern Forming Method) Using various materials of the above Examples and Comparative Examples, various negative printed images were obtained by a word processor, and these were printed by a Macbeth transmission densitometer. When the transmission density was measured under the same conditions, the results shown in Table 1 below were obtained.

[Table 1] Definition of transmission density : This is the amount indicating the degree to which light is absorbed by a given substance layer (the ink layer transfer portion of the transferred material after printing) and has the same meaning as the absorbance. The higher the value, the greater the amount of absorption (hard to transmit light). Absorbance is represented by the following formula when the intensity of light changes from I ₀ to I due to absorption while passing through a material layer. A = log ₁₀ (I ₀ / I)

Use Example 1 A positive image having a high contrast was obtained by exposing the image obtained in Example 5 on a photosensitive paper. These images can be used for postcards, photo calendars and the like.

USE EXAMPLE 2 Using the image obtained in Example 6, it was superposed on a silk screen printing plate and irradiated with ultraviolet rays of 350 nm, and the portion where the wax was not transferred was only the mesh,
It can be used as a silk screen plate. Use Example 3 When the image obtained in Comparative Example 2 was overlaid on a silk screen printing plate and irradiated with 350 nm ultraviolet light, there was no contrast and only the mesh was used, and it could be used as a screen for a silk screen. Absent.

[0025]

According to the present invention as described above, a white image is formed by peeling and removing the ink layer 6 imagewise from the transparent substrate film on which the heat-meltable ink layer 6 is provided. When used as a negative film or a mask film, the ink layer 6 portion left unpeeled can sufficiently block the light from the light source, and a clear positive or negative image can be formed on the silver salt photographic film or photoresist layer. Can be formed. Such a negative pattern or the like can be easily formed by using, for example, a simple thermal transfer printer connected to a word processor, a computer or the like.

[Brief description of drawings]

FIG. 1 is a diagram schematically illustrating an ink peeling film A, an exposure pattern ink sheet B, and a pattern forming method of the present invention.

[Explanation of sign]

 A: Film for peeling ink B: Ink sheet for exposure pattern 1: Base film 2: Sticking prevention layer 3: Heat seal layer 4: Transparent base film 5: Release layer 6: Ink layer 7: Protect layer 8: Thermal head 9: Image

Claims (5)

[Claims] 1. An ink peeling film A having a sticking prevention layer 2 on one surface of a base film 1 and a heat seal layer 3 on the other surface. 2. The ink peeling film A according to claim 1, which has a tape-shaped ribbon shape. 3. A release layer 5 on one surface of the transparent substrate flume 4.
Through the heat-meltable ink layer 6 having a transmission density of 2.0 or more.
And the transmission density of the peeled portion of the ink layer is 0.5 or less. 4. The transparent substrate flume 4 has a thickness of 25 to 200.
The ink sheet B for an exposure pattern according to claim 3, which has a thickness of μm. 5. The ink peeling film A according to claim 1 and the exposure pattern ink sheet B according to claim 3 are overlapped with the heat seal layer 3 and the ink layer 6 facing each other. An image-wise heat is applied from the back surface of the ink peeling film A described in 1 above to peel off the heat-meltable ink layer 6 of the exposure pattern ink sheet B according to claim 3 image-wise. Pattern formation method.