JPH0473773B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrostatic recording material for plate making, and in particular, a transparent plastic film support having an electrostatic recording layer on one side and an actinic ray blocking property on the other side,
The present invention also relates to an electrostatic recording material for plate making having a peelable mask layer that transmits visible light. Conventionally, in the plate-making process for photo printing, in the process of creating separated film originals for PS printing from pasted originals containing text and color photographs, silver salts and other reversal photosensitive materials or masking materials were used. Materials and the like are used that selectively block unnecessary parts of the original document. The above-mentioned masking material may be a colored plastic film or colored paper made by adding a coloring agent that blocks actinic rays to plastic or paper, or a peeling material that has the ability to block actinic rays on one side of a transparent plastic film. Products with a sexual coating etc. are known. The former masking material is used by cutting out the material itself to form a pattern, while the latter masking material is used by cutting only the colored film on the plastic film support with a cutter knife, peeling only the necessary part from the support, and creating a light-shielding film. It forms a pattern. This patterning work is usually done by overlapping the pasted manuscript or photographed squirrel manuscript, and the patterned masking material is combined with photographic material such as silver salt and transparent adhesive tape, and then used with the manuscript for the next process. has been done. In the conventional masking work described above, the position of the original is likely to shift during cutting with a knife, etc., and the photosensitive film and masking material overlap, so the base thickness between the light-sensitive emulsion surface and the light-shielding coating is reduced. There was a defect that increased the image quality and caused blurring. Furthermore, in the case of silver salt materials, the exposure and development steps of the photosensitive film must be carried out in a dark room, resulting in poor working efficiency and the need for equipment for exposure and development. On the other hand, diazonium photosensitive materials have a problem with odor because ammonia is used during development. Although the diazonium photosensitive material described above can be made into a brighter room to a certain extent than the silver salt material, it still requires safe light. Furthermore, both silver salt materials and diazonium photosensitive materials have problems with storage stability.
In particular, diazonium photosensitive materials have a short self-life of about one year, and require a cool, dark place or equipment for storage. Furthermore, in order to obtain a second original image optically from the original manuscript, both the silver salt material and the diazonium photosensitive material mentioned above were corrected over time.
It is necessary to keep the original manuscript for a certain period of time,
There is a problem with the dimensional stability of the original manuscript due to temperature changes during storage, and when making corrections due to changes over time, misalignment occurs between the original manuscript and the revised drawing, resulting in registration marks between the original manuscript and the revised drawing. Positioning by alignment was difficult. On the other hand, paper-based masking materials tend to warp due to the influence of temperature and humidity, and have poor dimensional accuracy, which poses problems for precision plate making, such as when masking a large area of a negative original. The present invention eliminates the defects of the conventional plate-making materials, and its gist is that a transparent support having a low resistance layer and a dielectric layer on the surface and a volume resistivity of 10 ¹ to ^{10 20} Ωcm is coated on the back side of the transparent support. , an electrostatic recording material for plate making having a light-shielding mask layer, characterized in that it is provided with a removable mask layer having actinic ray-shielding properties and visible light-transmitting properties. Hereinafter, the present invention will be specifically explained based on the drawings.
In the drawings, FIG. 1 is an enlarged cross-sectional view showing one embodiment of the present invention, and FIG. 2 is an example of a type in which a removable mask layer having actinic ray blocking properties and visible light transmittance is laminated. An enlarged sectional view showing an example,
Fig. 3 is an enlarged cross-sectional view showing the material shown in Fig. 1 subjected to electrostatic image processing to form an electrostatic image on the dielectric layer and partially peeled off the light-shielding mask layer. FIG. 2 is an enlarged cross-sectional view showing a state in which the material shown in the figure is subjected to electrostatic image processing, an electrostatic image is formed on the dielectric layer, and a light-shielding mask layer is partially peeled off. In the drawings, reference numeral 1 denotes a transparent support, which is a film or sheet made of polyethylene terephthalate resin, polycarbonate resin, polyvinyl chloride resin, triacetyl cellulose resin, or the like. The volume resistivity value of the transparent support 1 is 10 ¹ to 10 ²⁰ Ω.
cm. Note that the support itself may be a transparent support having conductivity. The volume resistivity of this electrically conductive transparent support is suitably in the range of 10 ⁵ to ^{10 12} Ωcm. Furthermore, a low resistance layer 2 is provided on the surface of the transparent support 1.
Further, a dielectric layer 3 is provided on the surface of the low resistance layer 2. The low resistance layer 2 is made of a conductive agent such as polyvinylbenzyltrimethylammonium chloride, 2
- By coating a copolymer of acroylethyltrimethylammonium chloride and vinyl sulfone, sulfonated styrene oligomer, etc. through a binder such as acrylic resin, methoxymethylolated nylon, thermoplastic polyester resin, and polyurethane resin. can get. The dielectric layer 3 provided on the low resistance layer 2 is made of acrylic resin, ethylene-vinyl acetate copolymer, polyvinyl butyral resin, silicone resin, polystyrene resin, vinyl chloride-vinyl acetate copolymer, and cellulose derivative resin. Coating with a coating liquid made by dissolving or dispersing etc. in water or organic solvent,
Set by drying. Incidentally, this coating liquid contains finely powdered silica or the like as a modifier. In the present invention, a releasable mask layer 4 having actinic ray blocking properties and visible light transmittance is provided on the back surface of the transparent support 1. The removable mask layer 4 which has actinic ray blocking properties and visible light transmittance has a flexible pigment or dye that has a blocking effect particularly against ultraviolet rays and is transparent to visible light. It is dissolved and dispersed in a thermoplastic polymer material. Specifically, thermoplastic polymer materials such as polyvinyl chloride, vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinylidene chloride copolymer, polyvinyl butyral, polyvinyl formal, polyamide, and polyurethane, azo dyes and pigments, and anthraquinone-based A light-shielding coating liquid obtained by blending dye pigments, copper phthalocyanine pigments, yellow lead, red iron, carbon black, etc., and dissolving or dispersing both in an organic solvent is applied to the back surface of the transparent support 1. Brush painting,
It is applied by coating and drying using a knife coater, roll coater, etc. In addition, a cationic antistatic agent, a nonionic antistatic agent, and an anionic antistatic agent are added to this removable mask layer as necessary. The thickness of the peeling mask layer 4 having actinic ray blocking properties and visible light transmittance is 5 to 50 microns, preferably 10 to 30 microns. Its light transmittance should be 2.0 or more using a Ratten 18A filter, and its volume resistivity should be 10 ⁵ to 10 ¹⁶ Ωcm. In addition, the adhesive strength of the peelable mask layer 4 having actinic ray blocking properties and visible light transmittance to the transparent support 1 may be within a range that is easy to peel off in normal work, and the adhesive strength by 180° peeling is sufficient. per 1cm width
Can be set from 10 to 500g. If it is less than 10 g, it will easily fall off, and if it is more than 500 g, the coating will break or become difficult to peel off, which is not preferable. Another method for providing the removable mask 4 having actinic ray blocking properties and visible light transmittance is to apply the light blocking coating liquid to the surface of a transparent support 5 different from the transparent support 1. Then, on the back surface of the transparent support 5, a laminate layer 6 capable of pressure-sensitive and heat-sensitive adhesion is interposed and laminated onto the back surface of the transparent support 1 using a laminator. Specifically, the thickness of the transparent support 5 is 5 to 100μ.
and preferably 10 to 50μ. The light-shielding coating liquid is applied to the surface of the transparent support 5 to a dry film thickness of 10 to
Coat and dry to a thickness of 30μ, and then coat with transparent support 5.
Laminate layer on the back side of 1~50μ, preferably 3
This is achieved by providing ~10μ. The laminate layer 6 of the light-shielding mask layer and the surface of the transparent support 1 opposite to the dielectric layer are laminated using a laminator at a temperature in the range of 50 to 200°C. The materials used for the laminate layer 6 include:
Epoxy resin, phenolic resin, acryl nitrile rubber, neoprene rubber, butyral resin, acrylic rubber, butadiene rubber, isoprene rubber, polyurethane resin, polyamide resin, polyester resin, ethylene-vinyl acetate copolymer, silicone resin, cyanoacrylate resin, polyvinyl Examples include one or more adhesives selected from pyrrolidone resins and the like. The light transmittance of the Ratsuten 18A filter is required to be 2.0 or higher.
Also, the adhesive strength after 180° peeling is 10 to 500 g per cm.
is preferred. The electrostatic recording material for plate making of the present invention having a removable mask layer having actinic ray blocking properties and visible light transmittance, configured as described above, has a layer on the back side of the electrostatic recording material that is highly resistant to ultraviolet rays. It is equipped with a removable coating that has light-shielding properties, and the surface of the electrostatic recording material is equipped with a low resistance layer and a dielectric layer for obtaining electrostatic images, which were conventionally supplied as separate materials. It has the feature of having two functions on one base material. As a result, when using the electrostatic recording material for plate making having the light-shielding mask layer of the present invention, images can be developed in a bright room, and images can also be easily developed by fixing the toner. I can do it. Furthermore, images can be easily erased or corrected using an eraser or the like, and can also be copied using a copying machine or the like. Furthermore, unlike photosensitive film, the problems of storage stability and self-life are resolved, and images can be displayed semi-permanently, and after the image has been formed, it is also possible to display different images and overlap them. By digitally converting image data using the functions of the electrostatic recording device, both negative and positive images can be produced. In addition, image data can be stored on a floppy disk, and when image data is needed, multiple copies of the same image can be displayed. Furthermore, when peeling off the light-shielding mask layer,
Since the light-shielding mask layer is transparent to visible light, the electrostatic image underneath can be seen visually, and unnecessary parts can be easily cut and peeled off with a cutter knife, etc. For example, cut-out character plates can be easily cut out. Moreover, it can be created with high precision,
It has the advantage that it can be printed onto lithium film or the like as an original version to create a second original drawing. In addition, since the electrostatic image recording layer and the removable mask layer are integrated into the front and back, there is no positional shift, and printing blur is significantly improved, resulting in qualitative improvements in photoengraving. It brings about excellent effects. Hereinafter, the present invention will be specifically explained with reference to Examples. Example 1 (a) Preparation of coating liquid for creating a peelable mask layer Components having the following composition were placed in a ball mill and dispersed and mixed to obtain a coating liquid. Vinyl chloride-vinyl acetate copolymer 140 parts by weight (Product name: Vinyrite VYHH, product of Union Carbide Co., Ltd.) Acrylic nitrile rubber 50 parts by weight (Product name: Nitzpol NS230, product of Nihon Gosei Rubber Co., Ltd.) Styrene resin 20 parts by weight Azo dye 12 parts by weight (Product name: Neozaponretsu GE product by Basf) Finely powdered silica 16 parts by weight (Product name: Aerosil OK412, product by Fuji Davison) Methyl ethyl ketone 600 parts Toluene 200 parts by weight (2) Adjustment of conductivity of coating liquid for low resistance layer Resin 10 parts by weight (Product name: Chemistat 6300H, Sanyo Kasei product) Methoxymethylolated nylon 5 parts by weight (Product name: Teisan Resin EF30T, Teikoku Kagaku product) Water-soluble polyester resin 5 parts by weight (Product name: Vylonal MD1200, Toyobo product) ) Finely powdered silica 0.1 parts by weight (Product name: Thyroid 308, Fuji Davison product) Carboxylated starch 0.05 parts by weight Methanol 20 parts by weight Water 70 parts by weight Methyl cell solve 10 parts by weight (c) Preparation of coating liquid for dielectric layer Styrene resin 5 parts by weight Polyvinyl butyral resin 10 parts by weight Methyl cellulose 5 parts by weight Finely powdered silica 1 part by weight (product name: Thyroid 308, manufactured by Fuji Davison) Carboxylated starch 2 parts by weight Methyl ethyl ketone 60 parts by weight Triol 20 parts by weight Thickness: 50μ, The low-resistance coating solution prepared in (b) above was applied to one side of a polyethylene terephthalate film with a volume resistivity of 2.6×10 ¹⁸ Ωcm using a coating bar #15, and dried to a low-resistance film with a thickness of approximately 4μ. Got layers. Next, apply the dielectric layer coating solution prepared in (c) above using coating bar #10,
A dielectric layer having a thickness of 3.5 μm was dried. Further, on the other side of the polyethylene terephthalate film, the coating solution for creating a releasable mask layer prepared in the above (a) is applied using a reverse roll coater and dried to have a film thickness of 25 μm and a high light-shielding property. By providing a peelable mask layer, an electrostatic recording material for plate making having a light-shielding mask layer was obtained. When a latent image was developed and fixed on the electrostatic recording material for plate making using an electrostatic recording device V80 manufactured by Versatech Co., Ltd. by applying a charge at a speed of 1.2 inches/sec at a charging voltage of 780 V, a clear image was obtained. Furthermore, the removability of the removable mask layer having high light-shielding properties was also good. The results are shown in Table 1. Example 2 Antistatic material kneaded polyester film support (product name: X53 Toray product, thickness 75μ volume resistivity)
4.2×10 ¹³ Ωcm) in the same manner as in Example 1 to obtain an electrostatic recording material for plate making by respectively providing a low resistance layer 2, a dielectric layer 3, and a peelable mask layer 4 having high light-shielding properties. Ta. When a latent image was developed and fixed on the electrostatic recording material using an electrostatic recording device V80 manufactured by Versatech Co., Ltd. by applying a charge at a speed of 1.2 inches/sec at a charging voltage of 680 V, a clear image was obtained. or,
The removability of the removable mask layer having high light-shielding properties was also good. The results are shown in Table 1. Example 3 (d) Preparation of coating solution for laminate layer Ethylene-vinyl acetate copolymer 20 parts by weight (product name: Soarex DH, product of Nippon Gosei Rubber Co., Ltd.) Fine powder silica 0.2 parts by weight (product name: Thyroid 308 Fuji Davison) Methyl ethyl ketone 50 parts by weight Triol 30 parts by weight (e) Coating liquid for mask layer with high light-shielding properties for laminate Polyester resin 20.0 parts by weight (Product name: Vylon 200 Toyobo product) Azo dye 2.0 parts by weight (Product name Azo dye 2.0 parts by weight (Product name: Neozaponred GE Basf Company product) Leveling agent 0.5 parts by weight (Product name: Paintat M, Dow Corning product) Methyl ethyl ketone 50.0 parts Triol 30.0 parts Thickness: 20μ The coating solution for a mask layer with high light-shielding properties for lamination prepared in the above (e) was coated on one side of a polyethylene terephthalate film support using a reverse roll coater to form a mask layer with a film thickness of 9 μm with light-shielding properties. 4, and then apply the laminating coating solution prepared in (d) above to the other surface of the support 4 using a coating bar #10, allowing pressure-sensitive adhesion with a film thickness of approximately 3μ. A laminate layer 6 is provided. Next, a pre-prepared polyethylene terephthalate film support (thickness 100μ volume resistance 5.3
Transparent support 1 having a low resistance layer 2 and a dielectric layer 3 provided on one side of the substrate (×10 ¹⁸ Ωcm) in the same manner as in Example 1.
On the other side, first laminate about 100 layers.
Laminate with a heat roll laminator at ℃,
Peelable mask layer (4, 5, 6) with high light-shielding properties
An electrostatic recording material for plate making having a light-shielding mask layer was obtained. The peeling interface of the electrostatic recording material having this light-shielding mask layer is between the laminate layer 6 and the transparent support 1, where the laminate layer is peeled off from the support surface adhered to the mask layer, and the laminate layer is peeled off from the support surface adhered to the mask layer. No layers remain. The electrostatic recording material for plate making having this peelable mask layer was coated at a speed of 1.2 using the same recording device as in Example 1.
When a latent image was developed and fixed by applying a charge at a voltage of 700 V in/sec, a clear image was obtained. The results are shown in Table 1. 【table】

[Brief explanation of the drawing]

FIG. 1 is an enlarged cross-sectional view showing an example of the electrostatic recording material for plate making having a light-shielding mask layer of the present invention, and FIG. 2 is an enlarged cross-sectional view showing an example of the type in which the light-shielding mask layer is laminated. , FIG. 3 is an enlarged cross-sectional view showing the material shown in FIG. 1 subjected to electrostatic image processing to form an electrostatic image on the dielectric layer, and a part of the light-shielding mask layer has been peeled off. FIG. FIG. 3 is an enlarged sectional view showing a state in which the material shown in FIG. 2 is subjected to electrostatic image processing, an electrostatic image is formed on the dielectric layer, and a part of the light-shielding mask layer is peeled off. DESCRIPTION OF SYMBOLS 1...Transparent support, 2...Low resistance layer, 3...Dielectric layer, 4...Releasable mask layer having actinic ray blocking properties and visible light transmittance, 5...Releasable mask layer Support, 6... Laminate layer, 7... Electrostatic image.

Claims (1)

[Claims] 1. A removable mask that has actinic ray blocking properties and visible light transmittance on the back side of a transparent support having a low resistance layer and a dielectric layer on its surface and a volume resistivity of 10 ¹ to ^{10 20} Ωcm. An electrostatic recording material for plate making having a light-shielding mask layer comprising a layer.