KR101152802B1 - A manufacturing method for no developing negative ps plate for uv setter and a photo-sensitive composition for carrying out the method - Google Patents

Abstract

The present invention relates to a process for producing a no-development negative PS printing plate for UV setters and a photosensitive composition for performing the same,

By developing a process for producing a phenomenon-free negative PS printing plate for a UV setter by applying a photosensitive composition having a tendency to become lipophilic upon irradiation with UV light on a support, which is usually hydrophilic,

It is possible to obtain a method of producing a non-negative negative PS printing plate for a UV setter, which is environmentally friendly and preferably irrelevant to pollution, and does not require expensive equipment costs, and a photosensitive composition for carrying out the method.

UV setter, negative PS printing plate, negative printing disc, no negative negative printing plate, no negative printing disc.

Description

A manufacturing method for no developing negative PS plate for UV setter and a photo-sensitive composition for carrying out the method}

The present invention relates to a negative pre-sensitized (P) printing plate manufacturing method for UV-setters and to a photosensitive composition for carrying out the same, and more particularly, a UV that does not require a developing step in manufacturing a printing disc. A negative PS printing plate for setters, that is, an invention relating to a method for producing a negative developing PS printing plate for UV setters, and a photosensitive composition for the implementation thereof.

A typical negative PS printing plate for UV setters consists of an aluminum plate as a support and a photosensitive composition layer applied thereon, ie a photosensitive layer, which comprises resins, diazo compounds, dyes and other additives and is alkali soluble. .

The aluminum plate is subjected to an electropolishing and anodizing process prior to application of the photosensitive composition.

The process of manufacturing a negative printing negative plate using the negative PS printing plate for UV setters as described above is briefly described as follows.

First, the negative PS printing plate can be used in two ways.

First, as a method of using a conventional UV exposure machine, by covering a printing disc film (the content to be printed on the surface, that is, the line portion is formed), and then irradiated with UV light (exposure process), UV passing through the printing disc film The light-received portion is hardened by crosslinking.

Secondly, as a method of using a UV setter, when a UV laser or UV light is directly irradiated from the UV setter without a printing original film, the UV-received portion is cured by crosslinking.

In the case of using the UV setter, the direct irradiation of UV light increases the profitability by accurately reproducing the halftone and solving the dust / tee problem, such as high quality reproduction and shortening the working time due to the shortening of the process.

In both of these methods, the remaining uncured portion remains in the alkaline soluble state.

When the negative PS printing plate for the UV setter, which has undergone the exposure process, passes through a developer carrying a developer (with alkalinity), the remaining portions except the caustic part are dissolved and only the caustic part, that is, the content to be printed, is visible on the surface of the PS printing plate (image formation). The plate made in this way is the negative printing disc.

Applying printing ink (oily, that is, containing an oil component) on the surface of the printing disc, the printed matter is obtained according to the principle that the ink is buried in the lip line which is lipophilic (oil affinity).

However, the manufacturing process of the negative PS printing plate and negative printing original plate for the UV setter of the conventional structure had some fundamental problems.

Preferred is the equipment cost associated with the electropolishing and anodic oxidation process is quite expensive (more than 50% of the total equipment cost).

In addition to the equipment cost, ie the associated mechanical equipment cost, the aluminum plate as the support is expensive because it requires high purity.

It should be pointed out that the electrolytic polishing and anodic oxidation process in the production process of the negative PS printing plate for UV setter and the alkali developing process in the production process of the negative printing disc are pollution-inducing processes that generate a small amount of waste water.

In addition, the manpower and power consumption associated with electropolishing, anodic oxidation and alkali development processes are also unmissable.

The present invention is to solve the above problems, does not require expensive equipment costs, as well as irrelevant pollution-free, environmentally friendly non-development negative PS printing plate production method for UV setter, and the method of It is an object to provide a photosensitive composition for implementation.

In addition, there is a secondary object of the present invention to provide a method for producing a non-negative negative PS printing plate for UV setter that can achieve a high production performance at a low production cost.

The object of the present invention as described above is to produce a non-developing negative PS printing plate for UV setters by applying a photosensitive composition, which is usually hydrophilic (water affinity) but tends to be lipophilic upon irradiation with UV light, on a support. Is achieved by developing a method.

In other words, the object of the present invention may be achieved by developing a photosensitive composition which is usually hydrophilic, but tends to be lipophilic when irradiated with UV light.

As mentioned above, being lipophilic means that the ink is deposited on the site (printable), while being hydrophilic means that the ink is not deposited on the site (not printable).

In order to have such a tendency in terms of affinity with the ink, the photosensitive composition of the embodiment of the present invention is characterized by using a hydrophilic resin containing -OH, -NH, -COOH or -COO- group.

According to the present invention, a method of producing a negative PS printing plate for a UV setter and a photosensitive composition for carrying out the same, the cost of equipment can be significantly reduced over a range including a process of manufacturing a negative printing disc, and a concern of generation of related pollution is raised. I can eliminate it.

In addition, manpower and power consumption are reduced due to the simplification of the process, while a significant increase in the number of negative PS printing plates for UV setters per unit time can significantly increase productivity.

Prior to describing in detail the method of manufacturing a no-development negative PS printing plate for a UV setter according to an embodiment of the present invention and a photosensitive composition for the implementation thereof, the main steps of the conventional method of manufacturing a negative PS printing plate for a UV setter are summarized. Proceeds in the order of degreasing → electropolishing → anodic oxidation → application of the photosensitive composition.

On the contrary, the main process on the no-development negative PS printing plate manufacturing method for the UV setter according to the embodiment of the present invention proceeds in the order of degreasing of the support → application of the photosensitive composition.

As described above, the production method of the development of a negative PS printing plate for the UV setter according to the embodiment of the present invention is characterized by completely eliminating the electropolishing and anodizing processes as compared with the conventional case.

The effects of excluding these electropolishing and anodic oxidation processes have been mentioned above.
A method and procedure for applying the composition are described in that a group including mounting, ie, placing an aluminum plate as a support on a holder and then including roller coating, slot die coating, and spray coating It depends on the application method chosen from.

One noteworthy point regarding the effects of the present invention is that the electrolytic polishing and anodizing process for the aluminum plate as a support is unnecessary, so that it is not necessary to limit the support to only an expensive aluminum plate.

In other words, it is possible to apply the photosensitive composition of the present invention to the surface of a suitable material other than an aluminum plate, for example, a synthetic resin plate, and to use it as a non-developing negative PS printing plate for UV setters, which is a huge cost saving compared to the conventional case. It means a sense effect.

Next, the photosensitive composition according to the embodiment of the present invention will be described for each component as follows.

First, as mentioned above, the resin as an essential component constituting the photosensitive composition of the embodiment of the present invention is a hydrophilic resin containing -OH, -NH, -COOH or -COO- groups.

This is so that the portion of the wire exposed to the UV light is crosslinked to change into lipophilic (ink), while the area not exposed to the UV light, that is, the portion of the non-radiation, remains hydrophilic (not ink).

In the case of the resin, it is obtained by adding a compound having a -OH, -NH, -COOH or -COO- group as a hydrophilic reactor to the water-soluble monomer and the oligomer, preferably for the purpose of rapid crosslinking, It is good.

As a hydrophilic reactor, the compound which has a -COOH group is more preferable, For example, maleic acid, succinic acid, glutaric acid, adipic acid, sumeric acid, azelanic acid, sebacic acid, isophthalic acid, terephthalic acid, tetrahydrophthalic acid, etc. are mentioned. And, applied to the photosensitive composition of the examples of the present invention is maleic acid.

In discussing the photosensitive composition of the embodiment of the present invention, a resin including a hydrophilic reactor is a key component, and a polyurethane or a copolymer thereof as an oligomer, a polyacrylic acid and a copolymer thereof, a polymethacrylic acid or a copolymer thereof, and a polyamide It is preferable to select from the group containing the copolymer, the polyvinyl acetate and the copolymer, the polyvinyl alcohol and the copolymer.

In the case of the diazo compound, it absorbs UV light in a wavelength of 380-420 nm, induces crosslinking with the resin and changes the lipophilic.

Preferred are diazo compounds which are light absorbing in the UV light region of 380-420 nm, and mesh in 3-methoxy-4-diazo diphenylamine bisulfate and 4,4-bis (methoxymethyl) diphenylether. Use is added with styrene sulfonate.

The UV light absorbing diazo compound to be described later is a product of Sanyotrading Co., Ltd. and Diversitec Co., Ltd.

For dyes, Crystal Violet, Malachite Green, Hodogaya's Victoria pure blue BOH from Victoria, Sigma-Adrich, and Victoria Blue blue) BH and the like, but applied to the photosensitive composition of the embodiment of the present invention is the Victoria Pure Blue BOH.

Meanwhile, in the case of an additive, there are an antifoaming agent, a leveling agent, a slipping agent, a curing agent, an adhesion promoter, and the like, and the amount of use thereof is suitably 0.1-2% of the stock solution.

Referring to the production of a development-free negative PS printing plate for the UV setter for confirming the performance of the photosensitive composition according to the embodiment of the present invention including the above components and the test process and results are as follows.

First, an aluminum disc having a purity of 99.5% and a thickness of 0.3 mm was electropolished to a surface roughness Ra = 0.4 state and then oxidized with 20% sulfuric acid to degrease the plate having an oxide film of 2.5 mg / cm ² and the aluminum disc. Obtained board.

On the surface of the plates, that is, the photosensitive composition having 30% by weight of the hydrophilic group added to the resin of Table 1 for 32% of the diazo compound, 64% of the resin, 2% of the dye and 2% of the additive, was applied. It dried sufficiently and obtained the undeveloped negative PS printing plate for UV setters.

[Table 1] Molecular weight of oligomer

＼ One 2 3 4 5 6 Molecular Weight (MW) 1,000 2,000 3,000 5,000 20,000 50,000

In the above [Table 1], the resin represents the molecular weight of the oligomer as a water-soluble urethane resin.

On the other hand, in actual use of the composition having the above component ratio, it is preferable to use a solvent having a composition: solvent ratio of about 9: 9.

Lusher's UV-X-POSE! After mounting on a 130 setter, each of the image formation states was confirmed by varying the amount of UV light irradiation for the same embodiment having the same component ratio.

Considering that a particular difference in image formation according to the surface machining of the aluminum disc does not appear, it is judged that it is not affected by the surface machining of the support.

Subsequently, in order to examine in more detail the correlation between the addition amount of the compound having a hydrophilic group and the setter output amount in the resin, the photosensitive composition obtained by adding 30% by weight of the compound having a hydrophilic group to the oligomer of [Table 1] on the surface of the support Applying a coating film thickness of 1.0-1.2g / m ^{2 on} to produce a light-free negative PS printing plate for the UV setter, and then to determine the image formation state by varying the setter output.

In addition, as shown in the component ratio of [Table 1], while producing oligomer molecular weight while maintaining (other components remain intact), the asymmetric PS printing plates for UV setters were produced, and then each setter output amount was changed to check each image formation state. did.

[Table 2] Correlation between oligomer molecular weight and setter output

＼ Setter output
Oligomer Molecular Weight ＼ 70 mW 80 mW 90 mW 100 mW 110 mW 120 mW 1,000 X X X △ ○ ○ 2,000 X X △ ○ ○ ◎ 3,000 X △ ○ ○ ◎ ◎ 5,000 X ○ ○ ◎ ◎ ◎ 20,000 △ ○ ◎ ◎ ◎ ◎ 50,000 △ ◎ ◎ ◎ ◎ ◎

        ◎: No problem when printing after exposure.

        ○: After printing, the amount of moist solution needs to be adjusted, but there is no problem.

        (Triangle | delta): It is a problem at the time of printing, since adjustment of the moist liquid is difficult in printing after exposure.

         X: It cannot be used as a printing disc because the condition is bad when printing after exposure.

As shown in [Table 2], as a result of adding a compound having a hydrophilic reactor to the oligomer by a weight ratio of 30%, the higher the oligomer molecular weight, the more the photosensitive composition of the present invention reduces the power consumption for UV light irradiation by about 25% It can be seen that there is.

In addition, although not shown in the table, compounds having hydrophilic groups were increased to a weight ratio of 50% (other components were kept) to prepare asymmetric PS printing plates for the test UV setter, and then each image was formed at a setter output of 90 mW. Check the status.

As a result, it was found that no significant difference was found between the negative printing original surfaces and the fact that no problems occurred during printing.

On the other hand, as mentioned above, the diazo compounds, resins, and dyes, which have the meaning as universal photosensitive composition components, are 20 to 35% by weight, 60 to 75% by weight, and 1.5 to 3% by weight, respectively, in their normal use ranges. Maintained range.

As described above, the method of manufacturing a non-developing negative PS printing plate for the UV setter of the present invention and the photosensitive composition for carrying out the same have been described in detail, but a person having ordinary knowledge in the technical field to which the invention pertains does not depart from the basic gist of the present invention. Various design changes within the range will be possible.

However, a method of producing a non-negative negative PS printing plate for UV setters, which is usually hydrophilic but has a tendency to change lipophilic upon irradiation with UV light, is applied directly to the practice of the method. It will be appreciated that all minor design changes as long as they are photosensitive compositions as materials fall within the technical scope of the present invention.

Claims (9)

delete It has a tendency to become lipophilic by crosslinking when irradiated with UV light, polyurethane, its copolymer, polyacrylic acid and its copolymer, polymethacrylic acid and its copolymer, polyamide and its copolymer, polyvinyl acetate and 60 to 75 wt% of the copolymer, polyvinyl alcohol and at least one resin selected from the group comprising the copolymer; It absorbs light in the UV light region of 380-420 nm and adds mesitylene sulfonate to 3-methoxy-4-diazo diphenylamine bisulfate and 4,4-bis (methoxymethyl) diphenylether. 20 to 35 wt% of a diazo compound; 1.5 to 3% by weight of a dye selected from the group consisting of crystal violet, malachite green, Victoria PureBlue BOH, Victoria Blue BH; A photosensitive composition comprising 0.1 to 2% by weight of an additive including an antifoaming agent, a leveling agent, a slipping agent, a curing agent, and an adhesion promoter. delete delete The method of claim 2, The resin is a photosensitive composition, characterized in that it comprises 60 to 75% by weight of polyurethane oligomer. The method of claim 2, The resin is a photosensitive composition, characterized in that it comprises 30 to 50% by weight of the compound having a hydrophilic reactor. delete delete delete