JPH0448111B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to a laser recording film suitable for recording using laser light. In recent years, many methods using laser light have been proposed in fields where high-speed or real-time recording of information is required. This method utilizes the intensity and resolution of the optical energy of laser light, and the laser light is irradiated onto a material with good light absorption, and the material that absorbs the laser light and is heated is deposited on the image receiving surface. It records images. [Prior Art] As this recording film, a recording film coated with a coating material containing heat-absorbing microparticles such as carbon black and a self-oxidizing binding substance such as nitrocellulose has been proposed (Japanese Patent Application Laid-Open No. 1983-1972). −43632). This recording film enables negative and positive recording by irradiating it with laser light and transferring fine particles such as carbon black to other recording tapes. Also applying to the transparent film a coating material consisting of particles that absorb laser energy, a self-oxidizing binder and a cross-linking agent or a cross-linking agent in combination with a cross-linkable resin or a non-oxidizing polymeric substance or resin; A method has been proposed in which a printing plate is produced by bringing this into close contact with a lithographic printing surface such as an aluminum sheet, and introducing laser light from the transparent film side to selectively transfer the coating material to the lithographic printing surface. (Japanese Patent Application Laid-Open No. 102402/1973).
All of these laser recording films utilize a self-oxidizing binder such as nitrocellulose, and the heat supplied by the laser beam heats the self-oxidizing binder, causing it to burn or eject, producing carbon black. The heat-absorbing particles and resin are carried out, leaving a plain area on the film or recording an image on the image receiving surface. [Problems to be Solved by the Invention] However, as mentioned above, self-oxidizing binders such as nitrocellulose are used as binder resins for articles used in the production of these laser recording films and image-forming printed boards. Because of this, acidic substances are generated due to thermal decomposition during image formation and corrode the system, there are concerns about safety during storage, and the resolution is poor. Furthermore, the recording layer (recording medium layer) of these laser recording films is easily scratched, and the coating film thickness is approximately
Because it was as thin as 0.5 μm, scratches easily reached not only the surface of the recording layer but also the surface of the substrate. The inventors of the present invention have made extensive studies to solve these drawbacks, and have found that a high blackening density can be achieved by using a non-self-oxidizing binder as a binder and further using graphite as heat-absorbing fine particles. can be used for further recording.
By containing a heat ray absorber that has a strong absorption ability in the wavelength range of YAG laser light, it is possible to make it easier to transfer the recording medium to the transfer image receiving surface of paper, printing plates, etc., and to prevent the recording medium from remaining on the transparent substrate. It has been discovered that it is possible to obtain a laser recording film that gives high-resolution negative and positive images without leaving any traces, and that by providing a protective layer made of organic polymer on the surface of the recording layer, it is possible to obtain a laser recording film that can produce high-resolution negative and positive images. It was discovered that it was possible to obtain a laser recording film with remarkable scratch resistance compared to recording films, and the authors published Japanese Patent Application No. 59-41724.
The application was filed as Japanese Patent Application No. 112311/1983. In this case, by providing a protective layer, it was possible to improve the scratch resistance and solvent resistance of the recorded portion of the recording film, but the problem was that the transferability to the transfer paper was reduced only in the thicker portions of the protective layer. becomes. [Means for Solving the Problems] As a result of intensive studies to solve these drawbacks, the inventors of the present invention have developed a scratch-resistant material made of a solvent-soluble thermoplastic polyester resin on the surface of the recording layer on the transparent substrate. The present inventors have discovered that by providing a protective layer having the following properties, a laser recording film can be obtained which has remarkable transferability compared to conventional laser recording films, and has thus arrived at the present invention. That is, the present invention provides a non-self-oxidizing binder, fine particles that provide high blackening density and absorb heat, and a heat ray absorber that has a strong absorption ability in the wavelength range of laser light used for recording, on a transparent substrate. The present invention provides a laser recording film having a recording layer containing the above recording layer, which is further provided with a protective layer made of a solvent-soluble polyester resin. [Function] As shown in FIG. 1, the laser recording film of the present invention has a structure in which a non-self-oxidizing binder and a high blackening density are provided on a laser-transmissive support 1, and then heat is applied. A layer (recording layer) 2 coated with a recording medium containing absorbing fine particles and a heat ray absorber having a strong absorption ability in the wavelength range of the laser beam used for recording, and a solvent-soluble polyester layer on the recording layer 2. A protective layer 3 made of resin is provided. As shown in FIG. 2, the recording method is to scan and guide a laser beam adjusted through a normal lens system and adjustment device from the support 1 side, and transfer the recording layer (transfer supply body) 2 to the transfer image receiving body 4. A method of recording an image by depositing it on the image receiving surface can be used. It is desirable to attach the image receiving surface in contact with the protective layer 3, and if the degree of adhesion is improved by reducing the pressure, the resolution will be much better. According to this method, the transfer image receptor 4 can be transferred in one operation.
A positive image can be obtained on the recording layer 2 and a negative image can be obtained on the recording layer 2 at the same time. The negative film can be used when making a printing resin plate, and the positive image can be used as a proof copy or a direct printing plate depending on the type of transfer image receptor 4. The support for the laser recording film of the present invention may be any film that transmits laser light, such as polystyrene film and polyethylene terephthalate film. Examples of fine particles that absorb heat in the recording layer and achieve high blackening density include graphite and carbon burrata, which can be used alone or as a mixture. In particular, fine powder graphite is suitable as a material capable of imparting high blackening density in a thin film. Examples of the heat ray absorber having a strong absorption ability in the laser beam wavelength region in the recording layer include compounds represented by the following general formulas (), (), or (). General formula () (Here, R is hydrogen or a lower alkyl group, X is an anion selected from the group consisting of hexafluoroarsenate ion, hexafluoroantimonate ion, fluoroborate ion, and perchlorate ion, and m is 0 or an integer of 1 or 2. A is

[expression] or

〔Effect of the invention〕

The laser recording film of the present invention is a real-time recording that does not require post-processing such as development and fixing, and is not exposed to light, so darkroom operations are not required, and it can be used for communication and computer processing information, which are rapidly developing in recent years. It is ideal for direct recording and can be widely applied. [Example] Hereinafter, the present invention will be explained with reference to Examples. All parts in the examples represent parts by weight. Example 1 N,N,N',N'-tetrakis (p
-diethylaminophenyl)-p-aminophenyl amium hexafluoroantimonate
The mixed solution containing 6.8 parts was coated on a 75μ polyester film by dip coating and heated at 90°C.
This was used as a recording layer. A liquid mixture consisting of Formulation 2 was applied onto this recording layer to form a protective layer. Dry film thickness, blackening density, scratch resistance test results, and Nd-YAG laser (wavelength 1064nm,
Table 1 shows the results of an image forming test using irradiation with an output of 10 W and 0.5 Joule/cm ² ) on the recording medium. Prescription 1 Graphite 100 parts Ethyl cellulose 36 parts Ethyl acetate 1224 parts Prescription 2 Polyester resin (“Vylon” manufactured by Toyobo Co., Ltd.
200") 10 parts Methyl ethyl ketone 90 parts Example 2 A coating solution consisting of Formulation 3 was applied on the recording layer applied in Example 1 to form a protective layer. Formulation 3 Polyester resin (Fuji Photo Film Co., Ltd.) “Staphix P-LC”) 10 parts toluene 45 parts methyl ethyl ketone 45 parts Dry film thickness, blackening density, scratch resistance test results and Nd-YAG laser (wavelength 1064 nm, output
Table 1 summarizes the results of the image forming test using 10W, 0.5 Joule/cm ² ) irradiation on the recording medium. Comparative Example 1 A coating liquid consisting of Formulation 4 was applied onto the recording layer applied in Example 1 to form a protective layer. Prescription 4 Polymethyl methacrylate resin (Sumitomo Chemical Co., Ltd.)
"Sumipetx-B MGH" manufactured by Co., Ltd.) 10 parts Methyl ethyl ketone 90 parts Dry film thickness, blackening density, scratch resistance test results and Nd-YAG laser (wavelength 1064 nm, output
Table 1 summarizes the results of the image forming test using 10W, 0.5 Joule/cm ² ) irradiation on the recording medium.

【table】 [Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a laser recording film of the present invention, FIG. 2 is a schematic cross-sectional view of a recording device using the film of the present invention, and FIG. 3 is a diagram showing a measuring method for a scratch resistance test. . DESCRIPTION OF SYMBOLS 1...Support, 2...Recording layer, 3...Protective layer, 4...Transfer image receptor.

Claims (1)

[Claims] 1 A non-self-oxidizing binder on a transparent substrate,
In a laser recording film provided with a recording layer containing fine particles that provide high blackening density and absorb heat, and a heat ray absorber that has a strong absorption ability in the wavelength range of the laser light used for recording, A laser recording film characterized by having a protective layer made of a solvent-soluble polyester resin.