JPH05345475A - Original drawing film for plate making and protjection - Google Patents

Abstract

PURPOSE:To make the original drawing sharp, in the title film for thermal recording, by forming a thermal color forming recording layer containing a colorless or light-colored basic dye and a developer on a thermally reversible recording layer. CONSTITUTION:An original drawing film is constituted so that the max. transmissivity of a non-recording part becomes 30% or more in a light wavelength region of 350-450nm and the max. transmissivity of a recording part having the original drawing formed thereto by heat energy becomes 10% or more. That is a thermally reversible recording layer reversibly changed in transparency by temp. is constituted, for example, by adding a crystalline org. low molecular weight compd., for example, 10C or more fatty acid to a resin having transparency such as polyacrylate. A thermal color forming recording layer containing a basic dye such as 3,3-bis(p-dimethylaminophenyl)-6- dimethylaminophthalide and a developer such as active clay is formed on the recording layer and a protective layer is further provided thereon.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an original drawing film for plate making and projection in which an original drawing is prepared by a thermal recording system.

[0002]

2. Description of the Related Art Most of original drawing films for plate making and projection are of silver salt photographic film type.
In order to make a plate for printing using a silver salt photographic film, an original image is printed on a silver salt photographic film, and then an original image of this silver salt photographic film is printed on a PS plate coated with a photopolymerizable compound. There is a need. However, silver halide photographic film
Although it has an advantage that a very clear image can be obtained, it has a drawback that it takes many steps until the image is printed on the film and it takes time. Therefore, there is a strong demand for a film for plate making and a film for projection which can directly record an original drawing.

Further, Japanese Laid-Open Patent Publication No. 54-119377,
Japanese Patent Application Laid-Open No. 55-154198 describes a projection film which can be directly recorded using a recording material whose light transmittance changes with temperature. However, a recorded image using this recording material becomes unclear when the recording layer is transparent because it is simply clouded.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide an original drawing film for plate making and projection in which a clear original drawing is produced by a heat-sensitive recording system.

[0005]

The present invention comprises a thermoreversible recording layer of an original film having a thermoreversible recording layer whose transparency reversibly changes with temperature, containing a colorless or light-colored basic dye and a coloring agent. The object of the present invention is effectively solved by providing the thermosensitive color recording layer.

[0006]

The present invention provides a thermosensitive recording layer containing a colorless or pale basic dye and a color former on the thermoreversible recording layer of the original film having a thermoreversible recording layer whose transparency changes reversibly with temperature. An original drawing film for plate making and projection characterized in that a recorded image is formed on the film by a thermal recording method. Further, by providing a protective layer on the heat-sensitive recording layer, recording suitability (head residue, sticking) and storability of a recorded image with respect to chemicals such as a plasticizer are improved, and light transmittance of a recorded portion and an unrecorded portion is improved. Therefore, a clear recorded image can be obtained.

Particularly, when a printing plate (PS plate) made of an ultraviolet curable resin is prepared using an original film on which a recorded image (original diagram) is prepared, a monomer or oligomer for the ultraviolet curable resin is used as a light source. A high pressure mercury lamp, a metal halide lamp, or the like having a strong spectrum in the wavelength of light required for polymerizing, i.e., 350 to 450 nm range is used. Therefore, in the light wavelength range of 350 to 450 nm, when the maximum transmittance of the unrecorded portion of the original film is 30% or more and the maximum transmittance of the recorded portion where the original image is created is 10% or less, the unrecorded portion is not recorded. Since the difference in the amount of light passing through the recording portion and the recording portion becomes large, the PS plate can be effectively formed. If the maximum transmittance of the unrecorded area is less than 30%, the polymerization reaction of the monomers and oligomers for the UV-curable resin will be delayed, and if the maximum transmittance of the recorded area exceeds 10%, the polymerization reaction may occur. is there. Preferably, the maximum transmittance of the unrecorded area is 40% or more and the transmittance of the recorded area is 5% or less.

In the present invention, the thermoreversible recording layer whose transparency changes reversibly with temperature is composed of an organic low molecular compound having crystallinity in a resin having transparency. Specific examples of the transparent resin include polyacrylate,
Polymethacrylate, polyvinyl chloride, vinyl chloride / vinyl acetate copolymer, vinyl chloride / acrylate copolymer, vinyl chloride / vinylidene chloride copolymer, acrylate / acrylonitrile copolymer, acrylate / acrylamide copolymer, vinylidene chloride / Examples thereof include an acrylonitilyl copolymer, a silicone resin, an acrylate / silicone copolymer, and a phthalate ester resin. These resins may be used in combination of two or more, if necessary.

As an organic low molecular weight compound having crystallinity,
Examples thereof include fatty acids having 10 or more carbon atoms, fatty acid salts, fatty acid amides, fatty acid esters, aliphatic alcohols, and aliphatic amines. Further, specific examples of these compounds include, for example, higher fatty acids such as lauric acid, myristic acid, palmitic acid, stearic acid, arachidic acid, behenic acid and lignoceric acid, higher alcohols such as lauryl alcohol and stearyl alcohol, stearic acid amide. , Higher aliphatic amides such as behenic acid amide, methylene bis stearyl amide, ethylene bis stearyl amide, and higher aliphatic amines such as stearyl amine and behel amine. Two or more kinds of these organic low molecular weight compounds having crystallinity can be used in combination, if necessary.

In the thermoreversible recording layer, the organic low molecular weight compound having crystallinity is 10% with respect to the resin having transparency.
It is desirable to adjust in the range of ˜200 wt%, preferably 15˜100 wt%. If the proportion of the organic low molecular weight compound having crystallinity is less than 10% by weight, sufficient opacification cannot be obtained, and if it exceeds 200% by weight, the stability of the recorded image cannot be obtained.

The coating material for the thermoreversible recording layer contains the above resins and organic low molecular weight compounds such as methyl ethyl ketone, methyl butyl ketone, tetrahydrofuran, toluene, xylene,
It can be obtained by dissolving or pulverizing in an organic solvent such as ethanol, propanol, ethyl acetate or butyl acetate. In particular, in order to enhance the transparency of the thermoreversible recording layer, it is preferable to pulverize the organic low molecular weight compound to 1 μm or less.

Various types of basic dyes which are colorless or light-colored and which are used in the thermosensitive color recording layer of the present invention are known, and examples thereof include the following. 3,3-bis (p-dimethylaminophenyl) -6-dimethylaminophthalide,
3,3-bis (p-dimethylaminophenyl) phthalide, 3- (p-dimethylaminophenyl) -3- (1,
2-dimethylindol-3-yl) phthalide, 3-
(P-Dimethylaminophenyl) -3- (2-methylindol-3-yl) phthalide, 3,3-bis (1,2)
-Dimethylindol-3-yl) -5-dimethylaminophthalide, 3,3-bis (1,2-dimethylindol-3-yl) -6-dimethylaminophthalide, 3,3
-Bis (9-ethylcarbazol-3-yl) -6-dimethylaminophthalide, 3,3-bis (2-phenylindol-3-yl) -6-dimethylaminophthalide,
Triarylmethane dyes such as 3-p-dimethylaminophenyl-3- (1-methylpyrrol-3-yl) -6-dimethylaminophthalide, 4,4'-bis-dimethylaminobenzhydrylbenzyl ether, Diphenylmethane dyes such as N-halophenyl-leuco auramine and N-2,4,5-trichlorophenyl leuco auramine, thiazine dyes such as benzoyl leuco methylene blue and p-nitrobenzoyl leuco methylene blue, 3-
Methyl-spiro-dinaphthopyran, 3-ethyl-spiro-dinaphthopyran, 3-phenyl-spiro-dinaphthopyran, 3-benzyl-spiro-dinaphthopyran, 3-methyl-naphtho- (6'-methoxybenzo) spiropyran, 3-propyl-spiro -Spiro dyes such as dibenzopyran, lactam dyes such as rhodamine-B anilinolactam, rhodamine (p-nitroanilino) lactam, rhodamine (o-chloroanilino) lactam, 3-dimethylamino-7-methoxyfluorane, 3- Diethylamino-6-methoxyfluorane, 3-diethylamino-
7-Methoxyfluorane, 3-diethylamino-7-chlorofluorane, 3-diethylamino-6-methyl-7
-Chlorofluorane, 3-diethylamino-6,7-dimethylfluorane, 3- (N-ethyl-p-toluidino) -7-methylfluorane, 3-diethylamino-7
-(N-acetyl-N-methylamino) fluorane, 3
-Diethylamino-7-N-methylaminofluorane,
3-diethylamino-7-dibenzylaminofluorane, 3-diethylamino-7- (N-methyl-N-benzylamino) fluorane, 3-diethylamino-7-
(N-chloroethyl-N-methylamino) fluorane,
3-diethylamino-7-diethylaminofluorane,
3- (N-ethyl-p-toluidino) -6-methyl-7
-Phenylaminofluorane, 3- (N-cyclopentyl-N-ethylamino) -6-methyl-7-anilinofluorane, 3- (N-ethyl-p-toluidino) -6-
Methyl-7- (p-toluidino) fluorane, 3-diethylamino-6-methyl-7-phenylaminofluorane, 3-di (n-butyl) amino-6-methyl-7-phenylaminofluorane, 3-di (N-Pentyl) amino-6-methyl-7-phenylaminofluorane, 3-
Diethylamino-7- (2-carbomethoxy-phenylamino) fluorane, 3- (N-ethyl-N-isoamylamino) -6-methyl-7-phenylaminofluorane, 3- (N-cyclohexyl-N-methylamino) ) −
6-methyl-7-phenylaminofluorane, 3-pyrrolidino-6-methyl-7-phenylaminofluorane,
3-piperidino-6-methyl-7-phenylaminofluorane, 3-diethylamino-6-methyl-7-xylidinofluorane, 3-diethylamino-7- (o-chlorophenylamino) fluorane, 3-dibutylamino-
7- (o-chlorophenylamino) fluorane, 3-pyrrolidino-6-methyl-7-p-butylphenylaminofluorane, 3- (N-methyl-N-tetrahydrofurfurylamino) -6-methyl-7-ani Fluorane dyes such as linofluorane and 3- (N-ethyl-N-tetrahydrofurfurylamino) -6-methyl-7-anilinofluorane.

Various compounds are known as colorants used in combination with a basic dye, and the following are exemplified. Inorganic acid substances such as activated clay, acid clay, attapulgite, bentonite, aluminum silicate, 4-hydroxydiphenoxide, α-naphthol, β-naphthol, 4-hydroxyacetophenone, 4-tert-butylphenol, hydroquinone, 4-tert-octyl Catechol, 4,4'-isopropylidene diphenol (bisphenol A), 4,4'-cyclohexylidene diphenol, 2,2'-dihydroxydiphenol, 2,
2'-methylenebis (4-methyl-6-tert-butylphenol), 4,4'-isopropylidenebis (2-te
rt-butylphenol), 4,4'-sec-butylidene diphenol, 4-phenylphenol, 2,2'-methylenebis (4-chlorophenol), 4,4'-dihydroxydiphenylsulfone, 2,4'-dihydroxydiphenyl Sulfone, 4-hydroxy-4'-methyldiphenyl sulfone, 4-hydroxy-4'-chlorodiphenyl sulfone, 4-hydroxy-4'-methoxydiphenyl sulfone, 4-hydroxy-4'-isopropoxydiphenyl sulfone, 4-hydroxy Benzyl benzoate, dimethyl 4-hydroxyphthalate, hydroquinone monobenzyl ether, novolac type phenol resin, phenolic compounds such as phenol polymers, benzoic acid,
p-tert-butylbenzoic acid, trichlorobenzoic acid, terephthalic acid, 3-sec-butyl-4-hydroxybenzoic acid, 3-cyclohexyl-4-hydroxybenzoic acid,
3,5-Dimethyl-4-hydroxybenzoic acid, salicylic acid, 3-isopropylsalicylic acid, 3-tert-butylsalicylic acid, 3-benzylsalicylic acid, 3- (α-methylbenzyl) salicylic acid, 3-chloro-5- (α- Aromatic carboxylic acids such as methylbenzyl) salicylic acid, 3,5-di-tert-butylsalicylic acid, 3-phenyl-5- (α, α-dimethylbenzyl) salicylic acid, 3,5-di-α-methylbenzylsalicylic acid, And these phenolic compounds, aromatic carboxylic acids and for example zinc, magnesium, aluminum, calcium, titanium, manganese,
Organic acid substances such as polyvalent metal salts such as tin and nickel.

In the present invention, the use ratio of the basic dye and the color developing agent in the thermosensitive color recording layer should be appropriately selected according to the types of the basic dye and the color developing agent to be used and is not particularly limited. The coloring agent is used in an amount of 1 to 7 parts by weight, preferably 1 to 4 parts by weight, based on 1 part by weight of the basic dye. The coating liquid containing these substances is generally prepared by using water as a dispersion medium, stirring with a ball mill, attritor, sand mill or the like, and dispersing the basic dye and the colorant together or separately by a pulverizer. Prepared as a coating liquid. In particular, in order to enhance the transparency of the thermosensitive color-developing recording layer, it is preferable that the basic dye and the color former have an average particle diameter of 1 μm or less.

In such coating liquid, starch, hydroxyethyl cellulose, methyl cellulose, carboxymethyl cellulose, gelatin, casein, gum arabic, polyvinyl alcohol, diisobutylene / maleic anhydride copolymer salt, styrene / maleic anhydride are usually used as binders. Copolymer salt, ethylene / acrylic acid copolymer salt,
Styrene / acrylic acid copolymer salt, natural rubber emulsion, styrene / butadiene copolymer emulsion, acrylonitrile / butadiene copolymer emulsion, methyl methacrylate / butadiene copolymer emulsion, polychloroprene emulsion, vinyl acetate emulsion, ethylene At least one of vinyl acetate emulsion and the like is added in an amount of 10 to 40% by weight, preferably 15 to 35% by weight, based on the total solid content of the recording layer.

If desired, various auxiliaries can be added to the coating liquid. For example, dispersants such as sodium dioctylsulfosuccinate, sodium dodecylbenzenesulfonate, sodium lauryl alcohol sulfate, and fatty acid metal salts. , Zinc stearate, calcium stearate, polyethylene wax, carnauba wax, paraffin wax, ester wax, and other waxes,
An antifoaming agent, a fluorescent dye, a coloring dye, etc. are appropriately added.

Further, various pigments may be used in combination in the coating liquid unless the characteristics of the present invention are impaired. For example, kaolin, clay, calcium carbonate, calcined clay, calcined kaolin, diatomaceous earth, fine anhydrous silica. , Inorganic pigments such as colloidal silica, styrene microballs, nylon powder, polyethylene powder, urea / formalin resin filler, and organic pigments such as raw starch particles.

Further, a sensitizer may be used in combination depending on the purpose. Specific examples of the sensitizer include stearic acid amide, methoxycarbonyl-N-stearic acid benzamide, N-benzoylstearic acid amide, N-eicosanoic acid amide, ethylenebistearic acid amide, behenic acid amide, and methylenebisstearic acid. Amide, N-
Methylol stearamide, dibenzyl terephthalate, dimethyl terephthalate, dioctyl terephthalate,
Benzyl p-benzyloxybenzoate, phenyl 1-hydroxy-2-naphthoate, 2-naphthylbenzyl ether, m-terphenyl, dibenzyl oxalate, oxalate-di-p-methylbenzyl, oxalate-di-p- Chlorobenzyl, p-benzylbiphenyl, tolylbiphenyl ether, di (p-methoxyphenoxyethyl) ether, 1,2-di (3-methylphenoxy) ethane,
1,2-di (4-methylphenoxy) ethane, 1,2-
Di (4-methoxyphenoxy) ethane, 1,2-di (4
-Chlorophenoxy) ethane, 1,2-diphenoxyethane, 1- (4-methoxyphenoxy) -2- (2-methylphenoxy) ethane, p-methylthiophenylbenzyl ether, 1,4-di (phenylthio) butane, p
-Acetotoluidide, p-acetophenetidide, N-acetoacetyl-p-toluidine, di (β-biphenylethoxy) benzene, p-di (vinyloxyethoxy) benzene, 1-isopropylphenyl-2-phenylethane and the like are exemplified. To be done. The amount of these sensitizers used is not particularly limited, but it is generally desirable to adjust the amount within the range of 4 parts by weight or less relative to 1 part by weight of the color developing agent.

Further, a preservative improving agent may be used in combination so as to further enhance the preservability of the recorded image according to the purpose as long as the effect is not impaired. Specific examples of such a storage stability improver include, for example, 2,2'-methylenebis (4-methyl-6).
-Tert-butylphenol), 2,2'-ethylenebis (4-methyl-6-tert-butylphenol) 2,2 '
-Methylenebis (4-ethyl-6-tert-butylphenol), 2,2'-methylenebis (4,6-di-tert-
Butylphenol), 2,2'-ethylidene bis (4,
6-di-tert-butylphenol), 2,2'-ethylidenebis (4-methyl-6-tert-butylphenol), 2,2'-ethylidenebis (4-ethyl-6-te)
rt-Butylphenol), 2,2 '-(2,2-propylidene) bis (4,6-di-tert-butylphenol), 2,2'-methylenebis (4-methoxy-6-te)
rt-butylphenol), 2,2'-methylenebis (6
-Tert-butylphenol), 4,4'-thiobis (3
-Methyl-6-tert-butylphenol), 4,4'-
Thiobis (2-methyl-6-tert-butylphenol), 4,4'-thiobis (5-methyl-6-tert-butylphenol), 4,4'-thiobis (2-chloro-)
6-tert-butylphenol), 4,4'-thiobis (2-methoxy-6-tert-butylphenol), 4,
4'-thiobis (2-ethyl-6-tert-butylphenol), 4,4'-butylidenebis (6-tert-butyl-m-cresol), 1- [α-methyl-α- (4'-
Hydroxyphenyl) ethyl] -4- [α ', α'-bis (4 "-hydroxyphenyl) ethyl] benzene,
1,1,3-tris (2-methyl-4-hydroxy-5)
-Cyclohexylphenyl) butane, 1,1,3-tris (2-methyl-4-hydroxy-5-tert-butylphenyl) butane, 4,4'-thiobis (3-methylphenol), 4,4'-dihydroxy -3, 3 ', 5,
5'-tetrabromodiphenyl sulfone, 4,4'-dihydroxy-3,3 ', 5,5'-tetramethyldiphenyl sulfone, 2,2-bis (4-hydroxy-3,5
-Dibromophenyl) propane, 2,2-bis (4-hydroxy-3,5-dichlorophenyl) propane, 2,
Hindered phenol compounds such as 2-bis (4-hydroxy-3,5-dimethylphenyl) propane, N,
N'-di-2-naphthyl-p-phenylenediamine,
2,2'-methylenebis (4,6-di-tert-butylphenyl) sodium phosphate and the like can be mentioned.

The protective layer of the present invention comprises a water-soluble resin as a main component, and specific examples of such a water-soluble resin include, for example, oxidized starch, enzyme-modified starch, cation-modified starch, esterified starch and etherified starch. Starch such as starch, cellulose derivative such as methyl cellulose, ethyl cellulose, carboxymethyl cellulose, methoxy cellulose, hydroxyethyl cellulose, completely (or incomplete) saponified polyvinyl alcohol, carboxy modified polyvinyl alcohol, acetoacetyl modified polyvinyl alcohol, silicon modified polyvinyl alcohol, etc. Polyvinyl alcohol, sodium polyacrylate, polyacrylamide, polyvinylpyrrolidone, acrylic acid amide / acrylic acid ester copolymer, acrylic acid amide / acrylic acid ester / methacrylic acid copolymerization , Styrene-maleic anhydride copolymer alkali salts, isobutylene-maleic anhydride copolymer alkali salts, sodium alginate, gelatin, water-soluble polymer such as casein, polyvinyl acetate, polyurethane,
Latex such as polyacrylic acid, polyacrylic acid ester, polybutylmethacrylate, styrene / butadiene copolymer, vinyl chloride / vinyl acetate copolymer, ethylene / vinyl acetate copolymer, styrene / butadiene / acrylic copolymer Can be mentioned. Among these, polyvinyl alcohols such as completely (or incompletely) saponified polyvinyl alcohol, carboxy-modified polyvinyl alcohol, acetoacetyl-modified polyvinyl alcohol, and silicon-modified polyvinyl alcohol, which exhibit an excellent effect of preserving recorded images, are particularly preferable. ..

Further, in the protective layer, silicone oil modified with an epoxy group, a carboxyl group, an amino group, a methacryl group, a polyether group or the like is used in the form of an emulsion in an amount of 5 to 30% by weight based on the solid amount of the protective layer. Preferably 10-20
Addition by weight% improves transparency and runnability during recording. If it exceeds 30% by weight, the surface strength of the protective layer is lowered and the lees adhere to the thermal head during recording to cause recording failure.

The coating liquid for the protective layer is prepared by mixing water and a water-dispersible medium, and mixing and stirring an emulsion of silicone oil and a water-soluble resin. In the coating liquid, if necessary, a dispersant, a defoaming agent, a coloring dye, a fluorescent dye, a curing agent, an auxiliary agent such as an ultraviolet absorber, zinc stearate, calcium stearate, carnauba wax, paraffin wax, ester wax, etc. The lubricant of the present invention, and unless it impairs the features of the present invention,
It is also possible to use inorganic pigments such as calcium carbonate, zinc oxide, aluminum oxide, titanium dioxide, silicon dioxide, aluminum hydroxide, barium sulfate, zinc sulfate, talc, kaolin, clay, calcined clay, and colloidal silica in combination.

The method for forming the recording layer and the protective layer is not particularly limited, and suitable examples include air knife coating, varibar blade coating, pure blade coating, rod blade coating, short dwell coating, curtain coating and die coating. The coating liquid for the thermoreversible recording layer and the thermosensitive color-developing recording layer are sequentially applied and dried on the support by various coating methods. As the support, a transparent film of polyester, polypropylene, vinyl chloride or the like is used. The coating amount of the coating liquid for the thermoreversible recording layer is 1 to 25 g / dry weight.
m ² , preferably adjusted in the range of 5 to 15 g / m ² ,
The coating amount of the coating liquid for the thermosensitive color recording layer is 1 to 10 in dry weight.
It is adjusted in the range of g / m ² , preferably 2 to 6 g / m ² .

[0024]

EXAMPLES The present invention will be described more specifically with reference to the following examples.
Although described, the present invention is not limited to these. Well
Unless otherwise specified, parts and% in the examples are by weight.
Parts and% by weight are shown. [Example 1] Preparation of coating liquid for thermoreversible recording layer Behenic acid 7 parts, vinyl chloride / vinyl acetate copolymer 20
Part and 73 parts of tetrahydrofuran
By mixing and stirring, a coating solution for the thermoreversible recording layer was obtained. Preparation of solution A 3-di (n-butyl) amino-6-methyl-7-phenyl
10 parts of luaminofluorane, 1,2-di (3-methylphenyl)
Enoxy) ethane 20 parts, methyl cellulose 5% water solution
A composition consisting of 30 parts of liquid and 60 parts of water is sand-milled.
And pulverized until the average particle diameter was 0.8 μm. Preparation of solution B 4-hydroxy-4'-isopropoxydiphenyl sulphate
20 parts of phon, 20 parts of 5% aqueous solution of methylcellulose,
And a composition comprising 40 parts of water in a sand mill for average particles
It was pulverized to a diameter of 0.8 μm. Preparation of coating liquid for thermosensitive color recording layer 120 parts of solution A, 80 parts of solution B, colloider with solid concentration of 30%
Rusilica (average particle size 20 nm) 70 parts, solid concentration 50
% Styrene-butadiene 58 parts, dioctyl sulfoco
From 1 part of a 10% aqueous solution of sodium succinate and 71 parts of water
The following composition was mixed and stirred to obtain a recording layer coating liquid. Preparation of coating liquid for protective layer 10% water of polyvinyl alcohol modified with acetoacetyl group
150 parts of solution, 30% solid concentration of colloidal silica (flat
Uniform particle size 20 nm) 5 parts, dioctyl sulfosuccinate
1 part of 10% aqueous solution of epoxy resin, solid concentration of 30% epoxy
Agitating a composition consisting of 8 parts of hydrophilic silicone emulsion
A coating solution for protective layer was obtained. Formation of each recording layer and protective layer 125 μm thick polyester film [Product name: S
Tell film A7300, manufactured by Toyobo Co., Ltd.]
Coating amount after recording layer coating liquid is 8g / m²So that
After coating and drying, leave it at 70 ° C to make the thermoreversible recording layer transparent.
Coating solution for thermosensitive color recording layer and coating solution for protective layer
The coating amount after drying is 3 g / m ²2 g / m²
Coating and drying to achieve
Then, an original drawing film was obtained.

Example 2 An original film was prepared in the same manner as in Example 1 except that 30 parts of stearic acid was used instead of 30 parts of behenic acid in the preparation of the thermoreversible recording layer coating solution of Example 1. Obtained.

Example 3 Example 1 was repeated except that a corona discharge treated biaxially stretched polypropylene film having a thickness of 60 μm was used instead of the polyester film in the formation of each recording layer and protective layer of Example 1. An original film was obtained in the same manner as.

Comparative Example 1 An original film was obtained in the same manner as in Example 1 except that the thermoreversible recording layer was not provided in the formation of each recording layer and protective layer in Example 1.

Comparative Example 2 An original film was obtained in the same manner as in Example 1 except that the thermosensitive color-developing recording layer was not provided in the formation of each recording layer and protective layer in Example 1.

The results of recording on the thus obtained five kinds of original drawing films using a thermal head with an applied energy of 0.45 mJ / dot are shown in FIGS. 1 to 5 and Table 1. However, [Table 1] shows the results of visual determination of the sharpness of the projected image when the recorded image and the recorded original film were irradiated with a metal halide lamp.

◯: The recorded image and projected image are clear. X: The recorded image and projected image are unclear.

[0031]

[Table 1]

[0032]

As is apparent from [FIG. 1] to [FIG. 5] and [Table 1], the film of the present invention is 350 to 450.
In the light wavelength region of nm, the original film has a low transmittance in the recorded area, a large difference in the transmittance between the unrecorded area and the recorded area, and a clear recorded image and projected image.

[Brief description of drawings]

FIG. 1 is a diagram in which the transmittance in a recorded portion and an unrecorded portion is measured by a spectrophotometer [trade name: UVIDE-505, manufactured by JASCO Corporation].

FIG. 2 is a diagram in which the transmittance in a recorded portion and an unrecorded portion is measured by a spectrophotometer [trade name: UVIDE-505, manufactured by JASCO Corporation].

FIG. 3 is a diagram in which the transmittance in a recorded portion and an unrecorded portion is measured by a spectrophotometer [trade name: UVIDE-505, manufactured by JASCO Corporation].

FIG. 4 is a diagram in which the transmittance in a recorded portion and an unrecorded portion is measured by a spectrophotometer [trade name: UVIDE-505, manufactured by JASCO Corporation].

FIG. 5 is a diagram in which the transmittance in the recorded portion and the unrecorded portion is measured by a spectrophotometer [trade name: UVIDE-505, manufactured by JASCO Corporation].

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[Procedure amendment]

[Submission date] June 18, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction content]

Further, in the protective layer, a silicone oil modified with an epoxy group, a carboxyl group, an amino group, a methacryl group, a polyether group or the like is used in the form of an emulsion in an amount of 5 to 30% by weight based on the solid amount of the protective layer. Preferably 10-2
By adding 0% by weight, transparency and running property during recording are improved. If it exceeds 30% by weight, the surface strength of the protective layer is lowered and the lees adhere to the thermal head during recording to cause recording failure.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Brief explanation of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a spectrophotometer [trade name: UVIDE-] for transmittance of a recorded portion and an unrecorded portion of an original film in Example 1.
505, manufactured by JASCO Corporation].

FIG. 2 shows a spectrophotometer [trade name: UVIDE-] for transmittance of a recorded portion and an unrecorded portion of an original film in Example 2.
505, manufactured by JASCO Corporation].

FIG. 3 is a spectrophotometer [trade name: UVIDE-] for transmittance of a recorded portion and an unrecorded portion of an original film in Example 3.
505, manufactured by JASCO Corporation].

FIG. 4 is a graph showing the transmittance of a recorded portion and an unrecorded portion of the original film in Comparative Example 1 measured by a spectrophotometer [trade name: UVIDE-
505, manufactured by JASCO Corporation].

5 is a spectrophotometer [trade name: UVIDE-] for transmittance of a recorded portion and an unrecorded portion of an original film in Comparative Example 2. FIG.
505, manufactured by JASCO Corporation].

[Procedure 3]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 4

[Correction method] Change

[Correction content]

[Figure 4]

[Procedure amendment 4]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 5

[Correction method] Change

[Correction content]

[Figure 5]

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location 8305-2H B41M 5/26 102

Claims (3)

[Claims] 1. A thermosensitive recording layer containing a colorless or pale basic dye and a color former is provided on the thermoreversible recording layer of an original film having a thermoreversible recording layer whose transparency reversibly changes with temperature. An original drawing film for plate making and projection, which is characterized in that 2. The original drawing film for drawing and projection according to claim 1, wherein a protective layer is provided on the thermosensitive color recording layer. 3. In the light wavelength range of 350 to 450 nm, the maximum transmittance of the unrecorded portion is 30% or more, and the maximum transmittance of the recording portion on which the original drawing is created by thermal energy is 10% or less. Alternatively, the original drawing film for plate making and projection according to claim 2.