JPS5936256B2 - developer composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a developer composition used in a photosensitive layer, particularly a photosensitive layer for a printing plate, containing a water-insoluble polymer having a hydrophilic group.

As is well known, photosensitive layers made of photocrosslinking agents and polymers are used for various purposes.

For example, as described in "Photosensitive Resin" by Tsunoda (Printing Society Publishing Department, published in 1972), water-insoluble polymers with hydrophilic groups and photocrosslinking agents (e.g., diazo photosensitizers, azide photosensitizers) It has been shown that a photosensitive layer made of an ethylenically unsaturated compound (or an ethylenically unsaturated compound, etc.) is practical. Among them, a photosensitive layer consisting of a diazo photosensitive agent and the above-mentioned polymer is more practical and is disclosed in Japanese Patent Publications No. 35-16157 and No. 47-11.
No. 67, Special Publication No. 49-3961, Special Publication No. 51-656
No. 6, JP-A No. 50-30604, U.S. Patent No. 3, 65
2,272, US Pat. No. 3,660,097, etc. are typical examples. This type of photosensitive layer is used in photoresists or printing plates,
In particular, it is an indispensable element for lithographic printing plates. When the photosensitive layer is irradiated with ultraviolet rays, the irradiated portions harden or decompose, and the solubility in the developer changes.

The above-mentioned photosensitive layer, which forms a positive image from a negative film, becomes less soluble or swellable in a developing solution when irradiated with ultraviolet rays, so the unirradiated areas are removed, and the irradiated areas are placed on the support as an image layer. remain. If the image layer after such development processing is used as a printing plate, the image layer will contain even a small amount of developer, resulting in extremely poor printing suitability (
In particular, printing durability) may be reduced. Therefore, the printability of the photosensitive layer as a printing plate is largely influenced by the composition of the developer used during image formation.

For example, when removing the photosensitive layer in the unirradiated areas, if a developer with low swelling property of the photosensitive layer is used, a strong image layer can be obtained. It takes time, and the removed material tends to adhere to the image layer, and furthermore, scum is likely to occur on the plate surface. In addition, when a developer with high swelling or solubility is used, the removal rate of unirradiated areas is improved, but it is preferable for printing suitability in the image layer obtained by development or post-development water washing treatment, rubber treatment, etc. It is easy for foreign substances to get mixed in. Therefore, regarding the former developing method,
The above-mentioned measures must be taken, and in the latter method, a developer or Development of a developer composition is required. Generally, the above effects are achieved when a high boiling point solvent, for example, a high boiling point alcohol such as benzyl alcohol, furfuryl alcohol, phenylethyl alcohol, alcohol, or DL-α-phenylethyl alcohol is contained in the developer composition. It is said that it will be possible to print, but the printability is not as satisfactory as expected. Furthermore, plasticizers such as DOP, DBP, or phosphorus compounds cause stains on the plate surface. As a result of various studies on wetting agents having the above-mentioned effects, the present inventors found that
The present inventors discovered that this type of compound as shown in the general formula below is preferable as a developer composition, leading to the present invention.

That is, the present invention relates to a developer composition containing the general formula (wherein Rl and R2 are hydrogen or an alkyl group having 1 to 2 carbon atoms; n is an integer of 1 to 3) as a wetting agent.

The compounds representing the present invention have the general formula R,,R2
= H, n = 1.5 to 3 (for example, Nippon Nyukazai; trade name: phenyl glycol PGH).

In addition, ethylene glycol monophenyl (or tolyl) ether, propylene glycol monophenyl (or tolyl) ether, diethylene glycol monophenyl (or tolyl) ether, dipropylene glycol monophenyl (or tolyl) ether, triethylene glycol monophenyl (or tolyl) ether, Alternatively, tolyl ether, tripropylene glycol monophenyl (or tolyl) ether, etc. can be mentioned. As a developer composition containing these wetting agents, conventionally used compositions can be used.

That is, among the developer compositions of the present invention containing these wetting agents, the acidic or neutral developer has the following composition (unit: weight %), and the alkaline developer has the following composition (unit:
% by weight)) etc. is preferred.

These developer compositions contain hydrophilic groups (for example, hydroxyl groups, ether groups, amide groups, carboxylic acid groups, urethane groups, urea groups, etc.).

) can be applied to photosensitive layers containing water-insoluble polymers. Examples of this type of polymer include epoxy resin, phenolic resin, polyurethane, acrylic resin having a hydrophilic group or its copolymer, copolymer of styrene and maleic anhydride or its partial ester, polyamide, methyl vinyl ether, etc. Representative examples include copolymers of maleic anhydride, polyurea, polyhydroxystyrene, polyvinyl butyral, and shellac. Example 1 A 2S aluminum plate was mixed with 100g of caustic soda and 1 of sodium fluoride.
After washing with water at 80°C in which y was dissolved, anodization was performed for 1 minute in a sulfuric acid electrolyte (current density 2A/Dm2, voltage IO
V).

After washing well with water, add 5% sodium metasilicate aqueous solution (70℃)
The sample was immersed in water for 10 seconds, washed with water, and dried with hot air. A photosensitive liquid having the following composition was applied to the obtained aluminum plate using a whiter, and then dried at 80° C. for 3 minutes to obtain a photosensitive printing plate.

The coating amount after drying was 0.951/m''.

A negative film was vacuum-adhered onto the photosensitive layer of the obtained photosensitive printing plate, and a 30A (ampere) single-phase carbon mark lamp was used.
After irradiating with ultraviolet rays at a distance of 60 CWL for 1 minute, the plate was immersed in a developer having the following composition at room temperature for 30 seconds and washed with water to obtain a printing plate. When this printing plate was printed using a printing press, 5,000 prints with good oil sensitivity in the image area and excellent reproducibility were obtained.

Examples 2 to 9 Using the same method as in Example 1, comparative studies were conducted using various developers.

Claims (1)

[Claims] 1 General formula▲There are mathematical formulas, chemical formulas, tables, etc.▼ [In the formula, R_1 and R_2 are hydrogen or an alkyl group having 1 to 2 carbon atoms; n is an integer of 1 to 3] as a wetting agent. A developer composition comprising: