JPH0227655B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a diazo film for both dry and wet use for textile printing, and more particularly to a diazo film for textile printing that can sufficiently develop color not only with ammonia gas but also with an alkaline phenomenon liquid. Conventionally, it has been impossible to directly coat a synthetic resin film with a resin containing a photosensitive agent (a coupler and a diazo compound) due to poor adhesion. Therefore, the surface of the synthetic resin film is generally oxidized or roughened to improve adhesion. That is, the photosensitive agent was applied after the surface of the synthetic resin film was treated by a sandblasting method, an etching method, a surface coating method, a corona discharge method, a flame treatment method, or the like. Diazo films for printing are also commercially available, which are thought to be made by applying an adhesive layer to a polyester film as a base material and further forming a photosensitive agent layer on the adhesive layer. However, diazo films for textile printing, in which a photosensitizer is coated on the uneven film surface, can be produced using either a dry method in which the color is developed with ammonia gas after adhesion and baking (exposure), or a wet method in which the color is developed in an alkaline aqueous solution. However, to date, no one that can be used for both dry and wet purposes has been commercially available. Furthermore, commercially available products that are thought to have an adhesive layer and a photosensitive agent layer are also limited to dry color development. On the other hand, photographic printing films have conventionally used photosensitizers mainly consisting of silver halide. However, silver halide is expensive and at the same time requires a washing process after exposure and development when making copies. Insufficient washing may cause discoloration of the background or loss of images. Furthermore, silver halide has the disadvantage that its resolution is generally inferior to that of diazo photosensitizers. The present invention has been made in view of the current situation, and it is possible to carry out wet color development by using the conventional developing device for photographic printing film using silver halide as is, while also making it possible to use an ammonia developing device. The image obtained by exposure has characteristics superior to those of dry or wet diazo films. That is, the wet/dry diazo film for textile printing of the present invention has a modified vinyl acetate resin and a diazonium compound on an adhesive layer formed on one side of a synthetic resin film and consisting of a phenol or resorcinol compound as a coupler and a pre-coupling inhibitor. It is characterized by forming a photosensitive agent layer consisting of. Hereinafter, the present invention will be explained based on the drawings. The synthetic resin film 1 used in the present invention can be a film conventionally used as a base material for dry or wet diazo films for textile printing, such as polycarbonate, polyester,
Examples include cellulose acetate film. Furthermore, considering that the synthetic resin film 1 will be used for creating a second original after exposure, development, and image formation, a transparent synthetic resin film 1 is generally used. An adhesive layer 2 is provided on one side of the synthetic resin film 1.
is formed. This adhesive layer 2 consists of a phenol or resorcinol compound as a coupler and a pre-coupling inhibitor. As the phenol or resorcinol compound, for example, the following compounds are used.

【formula】 【formula】

【formula】

【formula】

【formula】

【formula】

Such a phenol or resorcinol compound improves the adhesion between the synthetic resin film 1 as a base material and the photosensitizer layer 3 made of a partially saponified and modified vinyl acetate resin-diazonium compound, which will be described later, and also maintains light-shielding properties itself. At the same time,
It has the function of a coupler. Furthermore, in the present invention, in order to prevent the phenol or resorcinol compound (coupler) and the diazonium compound of the photosensitizer from immediately reacting to form an azo dye when a photosensitizer as described below is applied, a coupler is used. A pre-coupling inhibitor is mixed therein. As such a pre-coupling agent, the following compounds having an acidity of PH2.0 or less are used in consideration of the color development during exposure and alkali development and the storage stability of the diazo film for textile printing. Sulfosalcylic acid, p-toluenesulfosalcylic acid, maleic anhydride, citric anhydride, tartaric acid. Incidentally, the additive amount of the pre-coupling agent is usually 30 to 60% by weight based on the coupler. Furthermore, in the present invention, a photosensitive agent layer 3 made of partially saponified and modified vinyl acetate resin and a diazonium compound is formed on the adhesive layer 2 formed on the surface of the synthetic resin. Partially saponified resin is one in which vinyl acetate resin is saponified to a degree of saponification of 40 to 70%. If the degree of saponification does not reach 40%, the formed film will have poor absorption of the developer (aqueous solution),
If it exceeds this range, the formed film will be dissolved in the developer (aqueous solution), which is not preferable. Partial saponification is shown by the general formula below, The degree of saponification is expressed as m/(m+l)×100. Partial saponification is usually carried out by alcoholysis using a small amount of alkali as a catalyst. Next, in addition to partial saponification, the vinyl acetate resin is modified with carboxyl groups or sulfonic acid groups as deduced from the following general formula. or The obtained partially saponified and modified vinyl acetate resin itself is insoluble in water or gels with water, but is soluble in alcoholic solvents and has the property of being able to absorb aqueous alkaline solutions. As the diazonium compound used in the photosensitive agent layer 3 in the present invention, those used in conventional dry or wet diazo printing films can be used as appropriate, and for example, the following compounds are selected. However, R ₁ is a C ₁ or C ₂ alkyl group.
or However, R is a _C1 to _C5 alkyl group. The mixing ratio of the partially saponified, modified vinyl acetate resin and the diazonium compound is usually 3:1 to 5:1. In producing the diazo film of the present invention, an adhesive layer solution containing a coupler and a pre-coupling inhibitor is applied to one side of a synthetic resin film 1 as a base material to form an adhesive layer 2. As the solvent, methanol, ethanol, n-butanol, etc. are usually used, and methanol is preferably used in consideration of ease of removing the solvent after application of the solution. After forming the adhesive layer 2, a solution containing a partially saponified and modified vinyl acetate resin and a diazonium compound is applied onto the adhesive layer 2 to form a photosensitive agent layer 3. Generally, methanol, ethanol, n-butanol, etc. are used as a solution solvent for forming the photosensitive layer agent 3. Similarly to the case of forming the adhesive layer 2, methanol and isopropyl are used because they can be easily removed after coating. Preference is given to using alcohol. The diazo film of the present invention contains a vinyl acetate resin that has been partially saponified and then modified with a carboxyl group or a sulfonate in the photosensitive agent layer. Here, the sulfonic acid group is known to be a strongly hydrophilic group, and the hydrophilicity of the carboxyl group is inferior to that of the sulfonic acid group, but the alkali metal salt formed when it comes into contact with an alkaline developer has a strong hydrophilic property. shows. Note that the sulfonic acid group similarly forms an alkali metal salt, and this salt also exhibits strong hydrophilicity. Therefore, the diazo film of the present invention has a light-control agent layer that is easily compatible with water and has excellent absorbency for alkaline developers, and can be used not only in a dry method in which color is developed with ammonia gas, but also in an alkaline developer in which only water is used as a solvent. However, it shows good color development and can be used for both wet and dry applications. Further, since the diazo film of the present invention is easily compatible with water as described above, the stability of the color developed with an alkaline developer is also good, and the storage stability of the colored image is also excellent. Moreover, the image has excellent light-shielding properties, the background film has excellent clear properties, there is no peeling between the photosensitive layer and the film, and it has long shelf life (self-storage).
life) is also superior to commercially available dry or wet diazo printing films. Therefore, since the diazo printing film for both dry and wet use of the present invention is for both dry and wet use, it can be used without any inconvenience even in cases where conventionally only a dry type developing device or a wet type developing device is provided, and moreover, it can be used for photographic purposes. There is an advantage that a developing device for textile film can also be used, and therefore there is no need to purchase a new developing device, and an existing developing device can be used, which is advantageous in terms of equipment cost when used. Examples of the present invention will be described below. Example An adhesive layer solution having the following composition was prepared.

[Table] This adhesive layer solution was applied onto one side of a 0.05 m/m polyethylene terephthalate film to form an adhesive layer. Next, a solution of a mixture of a partially saponified and modified vinyl acetate resin and a diazo compound having the following composition was applied onto this adhesive layer to form an adhesive layer, thereby producing a wet/dry diazo film for textile printing.

【table】

[Table] Um chloride chloride
Double sulfur salt
The properties of the obtained diazo film are shown in the table below, comparing them with those of a conventional dry diazo film.

[Table] The composition of the alkaline developer is as follows. Water 90 (parts by weight) Lithium hydroxide 1.0 Potassium carbonate 5.0 Potassium metaborate 4.0 Details of each test item are as follows. Image density: The maximum density was measured using a reflection densitometer according to JIS P 4505. Light-shielding properties: Prepare the highest density (unexposed and fully developed area) and minimum density (fully exposed and developed area) for each sample, and place them in close contact with commercially available dry diazo photosensitive paper (medium speed). Appropriate baking was done. It is the value (%) obtained by dividing the density value of the image area (highest density part) of the photosensitive paper at that time by the highest density value of the photosensitive paper. Based on JIS P 4505. Clear properties: Each sample was fully exposed and developed, and examined by looking through the front with the naked eye. Peelability: Cellotape was pasted on the image area, peeled off with a certain strength, and the degree of peeling of the image area was judged with the naked eye. Storage stability (raw): An unexposed piece of each sample was left in a constant temperature and humidity chamber at 50°C and 50% PH, and changes were examined and judged visually. From the above table, it can be seen that the wet/dry diazo film for textile printing of the present invention not only exhibits superior properties in ammonia gas development, but also develops color satisfactorily even in an alkaline developer, compared to commercially available dry printing diazo films. It is clear that the film is excellent in all aspects of image density, light-shielding properties, clear properties, and releasability. Furthermore, its self-life is also superior to commercially available products.

[Brief explanation of drawings]

The figure is a partial sectional view showing an embodiment of the present invention. 1...Synthetic resin film, 2...Adhesive layer, 3...Photosensitive agent layer.

Claims (1)

[Claims] 1. On an adhesive layer formed on one side of a synthetic resin film and consisting of a phenol or resorcinol compound as a coupler and a pre-coupling inhibitor, a vinyl acetate resin partially saponified and then modified with a carboxyl group or a sulfonic acid group and a diazonium compound are placed. A diazo film for both wet and dry use for textile printing, characterized in that it has a photosensitive agent layer formed thereon.