JPS6027978B2 - Manufacturing method of plate material for electronic printing plate making - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for manufacturing a plate material for electronic printing plate making.

The term "electronic printing" used in the present invention refers to "an image forming method in which, in the process of forming an intermediate or final image, the previous image is formed using electrons or electrical energy."

(“Printing Engineering” NP.255 Published by Kyoritsu Publishing Co., Ltd.,
Reference) Conventional electronic printing plates, such as the most commonly used electronic master plate, usually use paper as a support and impregnate or coat it with a paint containing the components necessary for image formation. It is composed of

If an image is formed using an electronic printing process, it cannot be used as a printing plate as the non-image area is insufficiently hydrophilic. An acidic aqueous solution containing phosphates, aliphatic polybasic acids or their salts, chelating reagents such as disodium ethylenediaminetetraacetate, and water port polymers such as gum arabic and CMC (carboxymethylcellulose) is added to Fuwakuri. By applying a sufficient amount of a chemical treatment liquid to the plate surface to impart fresh water properties to the non-image areas, the plate can finally be used as an offset printing plate. However, since the hydrophilic layer is not very durable to begin with,
Non-image areas tend to get fingerprint stains that cannot be erased when the plate is handled, and once they are stained with ink, they cannot be erased. In addition, the adjustment of the dampening water during printing is delicate, and the variation in the amount of ink and water supplied is not very wide, and printing requires a certain level of skill. Printing durability is also 500-3
00 Miyakodomari is normal. The inventors of the present invention have completed the present invention as a result of extensive research into a method of manufacturing a plate material for electronic printing plate making that eliminates the above-mentioned drawbacks. That is,
The present invention is directed to polymers containing (1) 0.0 ol/kg or more of carbon atoms bonded to one hydrogen atom in the molecule (0)-
Polymers containing C=C-0.05 hol/k or more and polymers containing chemical groups (R is an alkyl group (C, ~5)
, allyl group, and phenyl group (n is an integer of 2 or more), or if necessary, the polymer is further coated with a photoconductive substance, a photosensitizer, etc. A hydrophilic radically polymerizable compound in a photopolymerizable composition that has been brought into contact with the surface of a polymer substrate formed by adding an agent, etc. is grafted by irradiation with actinic rays to form a hydrophilic layer on the surface. This is a method for manufacturing a plate material for electronic printing plate making, which is characterized by forming a plate material. In the plate material for electronic printing plate making according to the present invention, the hydrophilic layer on the surface has extremely excellent properties and has good water retention ability, so after image formation, it does not become desensitized as seen in the conventional plate material. There is no need to apply a liquid to the printing plate to make it hydrophilic.

Additionally, it does not leave fingerprint stains during handling, and can be removed and cleaned by temporarily wiping the stains with ink. In addition, since the water retention capacity of the non-image area is good, dampening water can be used sparingly, and the tolerance for fluctuations in the amount of ink and water is relatively wide, making printing work easier. This greatly reduces time loss, paper loss, etc., and can be said to be extremely useful in terms of productivity and economy. Because less dampening water is needed, ink emulsification is reduced, resulting in improved print image clarity, ink color clarity, gloss, and other improvements, resulting in a marked improvement in print quality. Furthermore, this hydrophilic layer is extremely strongly bonded and formed to the surface of the substrate by actinic rays, and has a significantly superior performance, with a printing durability of 10,000 sheets or more, compared to conventional electronic master plates. The polymers (1) used in the present invention include, for example, polystyrene, polypropylene, polypynyl chloride, polyvinylcarbazole, polyacrylonitrile, polyacrylic acid esters, polyvinyl acetate, branched polyethylene, polyamide, polycarbonate, polyester, and epoxy. Examples include resins, polyurethanes, phenolic resins, alkyd resins, chlorinated rubber, cellulose, cellulose conductors, and copolymers containing two or more of the monomers forming the polymers.

In addition, the polymer (b) includes, for example, a diene-based homopolymer such as polybutadiene, polyisoprene, polybentadiene, and the monomer forming the polymer, and includes styrene, (meth)acrylic acid esters, vinyl esters, is a binary or multi-component copolymerized polymer with (meth)acrylonitrile etc., unsaturated polyester,
Examples include unsaturated polyepoxide, unsaturated polyamide, and unsaturated polyacrylic.

The polymer (m) is one in which the group R is one or a combination of two or more of methyl, ethyl, butyl, phenyl, etc.
It contains 0% or more.

The polymer can also contain up to 50% of chemical groups or compounds other than groups.

For example, ■dioxyphenylene group, bisphenol A group,
Chemical groups such as polystyrene groups and polycarbonate groups,■
Polystyrene, polycarbonate, acrylic resin, etc.■
Fillers such as silica and mica. Examples of photoconductive substances include Cd, Hg, Sb, Bi, m, Mo, AI, and P.
b, photoconductive ones in oxides, sulfides, selenides, tellurides, iodides such as Zn, AS2S3, CdAs,
PbCr04, Se, S, anthracene, carbon black,
Examples include Cu0 and CuCI.

Examples of photosensitizers include acridine orange, fluorescin, eosin Y, rose bengal, and methylene flu.

The photopolymerizable composition used for forming the hydrophilic layer can undergo radical polymerization by irradiation with actinic rays, and specifically contains a hydrophilic radically polymerizable compound and, if necessary, a sensitizer,
It consists of a solvent, thickener, surfactant, etc.

Examples of hydrophilic radically polymerizable compounds include (meth)acrylic acids, (meth)acrylic acid esters, vinyl compounds, styrene sulfonic acids, maleic acids, maleimides, and (meth)acrylamides. For example, (meth)acrylic acids: 2-hydroxyethyl (meth)acrylate, diethylene glycol mono(meth)acrylate, triethylene glycol mono(
meth)acrylate, polyethylene glycol mono(meth)acrylate, 2-hydroxypropyl(meth)acrylate, 3-hydroxypropyl(meth)acrylate, glycerol mono(meth)acrylate, polyethylene glycol di(meth)acrylate (the molecular weight of polyethylene glycol is 170 or more), 2-diethylaminoethyl (meth)acrylate, 2-dimethylaminoethyl (meth)acrylate, 2-sulfoethyl (meth)acrylate, 3-sulfopropyl (meth)acrylate, 2-monophosphate ethylene (meth)acrylate, 2-phosphorus (Meth)acrylic acid esters such as acid-1-chloromethylethylene (meth)acrylate; N-pinylimidazole, vinylpyridine, N-pinylpiveridone, N-vinylcaprolactam, N-vinylpyridone, etc. Vinyl compounds: Styrene sulfonic acids: (anhydrous)
Maleic acids such as maleic acid, methyl (anhydride) maleic acid, and phenyl (anhydride) maleic acid; Maleimides such as maleimide, methylmaleimide, and phenylmaleimide; (meth)acrylamide, N-methyl (meth)acrylamide, N- Ethyl (meth)acrylamide, N-propyl (meth)acrylamide, N-butyl (meth)acrylamide, N-2-hydroxyethyl (meth)acrylamide, N.N-methylenebis(meth)acrylamide, N-methylol (meth)acrylamide, (meth)acrylamide, ) Acrylic morpholine, N-propyloxy (meth)acrylamide, N.N-dimethyl (meth)acrylamide, N.N-diethyl (meth)acrylamide, diacetone acrylamide (meth)acrylamide. One or more of these may be used in combination. In the photopolymerizable composition, in addition to the hydrophilic radically polymerizable compound, the following may be used in combination as necessary. For example, up to 1% by weight of a photosensitizer to promote addition by actinic radiation, up to 5% by weight of styrene, vinyltoluene, (meth)acrylic acid ester, etc. to adjust hydrophilicity and copolymerizability. General radical polymerizable compounds, alcohol-based, ester-based, ketone-based, ether-based, aromatic, etc. solvents of up to 9% by weight to improve uniform cross-contact with the base material, and as thickeners. Examples include water-soluble polymers such as cellulose derivatives having a content of less than 2% by weight. When a hydrophilic radically polymerizable compound is used in combination with the above substances, it is necessary to contain the hydrophilic radically polymerizable compound in an amount of 4% by weight or more of the total amount, and if it is less than 4% by weight, the surface of the base material is sufficiently hydrophilic. It becomes impossible to add a sex layer. The photosensitizer used in the photopolymerizable composition of the present invention is a triplet sensitizer with a triplet energy of 50 Kcal/mol or more or one that generates free radicals by actinic rays, and known ones can be used.

For example, benzoin ethers, azobisisobutyronitrile, thiuram compounds, etc. generate free radicals by themselves when exposed to light, and benzophenone, acetophenone, etc. generate free radicals by extracting active hydrogen from their molecules. photo-oxidation mono-reduction systems such as ferric chloride, Michler's ketone, etc. Examples of the support include sheet or film materials made of paper, plastic, metal, etc., alone or in combination of two or more. Here, the photopolymerizable composition used is one that does not dissolve the material to be treated.

In other words, the present invention provides a method for preventing radiation caused by actinic rays on the surface of a solid-phase base material in immiscible contact with a hydrophilic radically polymerizable compound in a gas-phase, liquid-phase, or solid-phase photopolymerizable composition. The major feature is that energy transfer and/or mass transfer of active species occur, and the surface of the substrate becomes hydrophilic. The wavelength of this active light is preferably within the range of 25 to 70 meters.

Examples of the light source include a low-pressure mercury lamp, a high-pressure mercury lamp, a high-pressure mercury lamp, a poppy lamp, a light lamp, a xenon lamp, a carbon arc lamp, a tungsten incandescent lamp, a metal halide lamp, and the sun. Light irradiation is usually for 0.1 seconds to 2 seconds. Unreacted substances and polymeric substances that are not bonded to the base material are removed by washing with a solvent such as water, alcohol, ketone, or ester, which does not damage the lipophilic base material that has been subjected to surface hydrophilic treatment. A plate material for electronic printing plate making is obtained which has a hydrophilic layer on its surface that is firmly bonded to the base material.

The method of making plates for offset printing using the printing plate for electronic printing plate making obtained according to the present invention includes the usual electrophotographic method, electrostatic recording method, magnetography method, inkjet recording method, etc. This is done by forming an image on the surface with lipophilic ink during the process.

In addition, the same effect can be obtained by forming a lipophilic image by handwriting or by typing with a tack writer, or by destroying the hydrophilic layer on the plate surface in some way to expose the lipophilic layer of the base material in the image area. Needless to say, scales are used for printing plates for offset printing. Hereinafter, the present invention will be explained in more detail with reference to Examples.

Example 1 The paint listed in Table 1 was applied to a 100 micron thick polyester sheet to a thickness of 30 microns,
Two ships were cured at 140qC.

The hydrophilic treatment liquid listed in Table 2 was applied to the surface to a thickness of 20 microns, and a Shigeru W high-pressure mercury lamp was applied to the surface from a distance of 30 m.
The material was irradiated with sand, and then washed and dried to produce a plate material for electronic printing plate making. This was electronically plated using U-Bi x 600W (manufactured by Konishiroku Photo Industry Co., Ltd., trade name), and then printed on an offset printer using tap water as dampening water to produce 10,000 sheets of clear prints. However, the printed version was still available. Table 1 1,4-polybutadiene (manufactured by Nippon Zeon ■, “LCB-
15) 100 Cobalt naphthenate (as cobalt metal) ○-1 Mineral spirit Appropriate amount table 2 Acryloylmorpholine 30 Tapolyethylene glycol (molecular weight = 2000) 20 Taacetophenone
1 night Penzoin ethyl ether
1 Tamethanol 1
Example 2 The paints listed in Table 3 were applied to water-resistant high-quality paper with a thickness of 100 microns at a rate of 50 mm/day and cured at 140 mm for 10 minutes.

The hydrophilic treatment liquid listed in Table 4 was applied to the surface at a rate of 40 m/force, and irradiated with a 20 W low-pressure mercury lamp (10 lamps in parallel) for 10 minutes at a distance of 5 skins, then washed with water, dried, and electronically stamped. Created printing plates for photoengraving. This is Fuji Xerox 3103
(Fuji Xerox Co., Ltd. product, trade name) was subjected to electronic printing plate making, and the same procedure as in Example 1 was carried out to obtain printed matter with clear image quality. At this time, I intentionally held the non-image on the plate with my bare hand and examined it for fingerprint stains, but no fingerprint stains were found. Table 3 Acrylic A801 (Note 1) 100 Tadesmodur L-75 (Note 2) 20 Shio Butyl Acetate Appropriate amount (Note 1)
) Nippon Reichhold Co., Ltd. product, acrylic polyol for urethane, 50% toluene/butyl acetate solution (Note 2) Bayer product, isocyanate, 75% ethyl acetate solution Table 4 NK Ester M-230 (Note 3) 1
0 Taacrylamide 20 Taglycerin 25 Tylose HIOOO0 (Note 4) 0.3
Tabenzophenol 1 temalgen 911 (Note 5) 2 tm/l
10 parts triethanolamine 5 parts water
27th evening (Note 3) Shin Nakamura Chemical Co., Ltd. product,
Monomethoxypolyethylene glycol monomethacrylate

Claims (1)

[Claims] 1 Polymer (II)-C containing 0.05 mol/kg or more of carbon atoms bonded to one hydrogen atom (I) in the molecule
= Polymers containing 0.05 mol/kg or more of C- and polymers containing ▲Mathematical formulas, chemical formulas, tables, etc. (an integer), or if necessary, the polymer further contains a photoconductive substance,
A hydrophilic radically polymerizable compound in a photopolymerizable composition that has been brought into contact with the surface of a polymer base material containing a photosensitizer, etc. is grafted onto the surface by irradiation with actinic rays. A method for producing a plate material for electronic printing plate making, characterized by forming a hydrophilic layer.