JPH09171273A - Manufacture of electrophotographic waterless planographic printing plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printing plate, which is applicable to the laser beam scanning exposure system of low output and is excellent in plate making image quality and printing image quality using a liquid developer, in the manufacture of an electrophotographic waterless planographic printing plate. SOLUTION: By this system, a releasable transfer layer 12 is provided on the surface of an electrophotographic photoreceptor 2, and an unfixed toner image 5 is formed using the liquid developer by electrophotographic process on it, both the toner image 5 and the transfer layer 12 are transferred on a planographic printing plate support 30 passing a primary receptor 20. When a nonadhesive resin layer 6 whose adhesive power for the surface of the transfer layer 12 is larger than that for the toner image 5 is provided at the entire surface of the transfer layer 12 of the support 30 where the toner image 5 is formed, the nonadhesive resin layer 6 on the toner image 5 is selectively removed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preparing an electrophotographic waterless planographic printing plate, and more particularly, it is applicable to a low output laser beam scanning exposure system, and has excellent plate making quality and printing quality. The present invention relates to a method for producing an electrophotographic waterless planographic printing plate having high printing durability.

[0002]

2. Description of the Related Art In conventional lithographic printing, an ink-philic image pattern is provided on a hydrophilic support, water and ink are alternately supplied, and water is attached to a hydrophilic non-image portion to prevent ink from attaching. In general, printing is performed by preventing the ink and attaching ink only to the image portion having ink affinity. However, this printing method is difficult to maintain the balance of water and ink,
Requires skill. As a solution to these disadvantages,
A lithographic printing plate that does not require dampening water (hereinafter referred to as "waterless lithographic printing plate") is used.

[0003] A waterless planographic printing plate has an oleophobic portion and an oleophilic portion. By supplying ink, ink is applied only to the lipophilic portion to perform printing. Conventionally, using a photosensitive material consisting of a silicon rubber layer and a photosensitive layer made of a photosensitive resin sequentially laminated, the irradiation between the silicon rubber layer and the photosensitive layer is controlled by light irradiation, and the image area is removed by wet development processing. A method for producing a printing plate has been put to practical use. However, since the sensitivity of the photosensitive material is low, since it is a system that requires contact exposure and wet processing with a short wavelength, high output light source,
There are problems in terms of simplicity, quickness, and labor saving, and further, it is extremely difficult to apply to the creation of a printing plate adapted to an image forming system using digital signals in recent years (that is, a digital direct printing plate). I have.

On the other hand, a plate material having a silicon layer which is in close contact with a heat-sensitive layer containing a light-to-heat conversion material is subjected to scanning exposure with a laser beam corresponding to a digital signal output. A new system for forming a waterless printing plate by forming an image by destroying and dry-processing the layers together has been marketed by Heidelberg. Although this system was in the heat mode, writing by laser light and dry processing were realized. However, since the sensitivity is low, a high-output laser writing device is required, and an increase in the size of the device, a length of plate making time, an increase in the cost of the system, and the like are obstacles.

On the other hand, a silicon layer is provided on a photoreceptor by using an electrophotographic photoreceptor which can easily form an image with a small-sized apparatus and can be adapted to scanning exposure of a low-output semiconductor laser beam. A method of forming a toner image (oleophilic) by an electrophotographic process to obtain a waterless printing plate is disclosed in, for example, JP-A-47-19305 and JP-A-49-19.
No. 904, No. 59-125752, No. 62-1604
No. 66 and the like. However, in actual printing, since the adhesion between the image area and the silicon layer is insufficient, the image area may be lost immediately after printing due to the strong adhesive force of the ink, and printing of a small number of copies is impossible. Was.

Therefore, a method of curing silicone rubber after forming a toner image using an uncured silicone rubber layer to improve printing durability (for example, Japanese Patent Application Laid-Open Nos.
Or a method using a silicon rubber layer containing a reactive group (for example, JP-A-52-29305).
No. 56-83750, No. 57-178893, etc.), a method of improving the adhesion between the toner image portion and the silicone rubber layer has been proposed. It did not match, and the adhesion was still insufficient.

On the other hand, an image using a dry toner is formed on a lithographic printing support by a PPC copying machine such as a laser printer using a low-output semiconductor laser beam or a thermal transfer printer, and a silicon layer is provided on the entire surface and cured. After that, the image portion and the silicon layer thereon are removed by a wet processing method using a solvent to form a printing plate (Japanese Patent Laid-Open No. 49-1).
21602) or a method in which a light absorbing agent-containing image or a non-adhesive image is formed, and a silicon layer is formed on the entire surface and cured, and then the image portion is removed by a dry method such as heat or mechanical force (Japanese Patent Laid-Open No. 3-118154) has been proposed.
These methods are considered to solve the problem of poor adhesion of the toner image to the silicon layer in a conventional printing plate manufactured by providing a toner image on the silicon layer. Further, the method described in JP-A-3-118154 is disclosed. Dry processing is possible for image formation with ink receptivity.

[0008]

However, in these methods, the adhesion between the silicon layer in the non-image area and the support is insufficient, or the peeling of the silicon layer is used as a material for the image area. The discrimination between the adhesion between the support and the silicon layer in the non-image area and the adhesion between the image area and the silicon layer is small due to the dependence on the light-to-heat conversion efficiency of the dye / pigment. However, it is difficult to selectively remove even small image portions by removing, and it is difficult to always provide a printing plate stably.

It is well known that the method of transferring from a PPC copier using dry toner or drawing an image by a thermal transfer printer described as an image forming means has a limit in producing a high-definition image. Therefore, it was difficult to produce a printing plate having a better plate image quality. In particular, in recent years, there has been a strong demand for a system for printing high-definition full-color images edited on a workstation or the like by digital signal processing in a simple, rapid, and labor-saving manner. Was not something that could be done.

Therefore, the object of the present invention is that it can be applied to a scanning exposure system of a low-power laser beam, the plate-making image quality and the printing image quality are excellent, the printing durability is good, and further, the simplicity, speediness and labor saving are achieved. It is to provide a method for producing an electrophotographic waterless planographic printing plate that can be realized. Another object of the present invention is to
An object of the present invention is to provide a method of preparing an electrophotographic waterless planographic printing plate capable of faithfully reproducing a high-definition image. It is a further object of the present invention to create an electrophotographic waterless planographic printing plate capable of removing image portions by dry means and faithfully reproducing a high-definition image stably even when conditions change during the removal process. It is to provide a method.

[0011]

The above object of the present invention is to provide a releasable transfer layer (T) mainly containing a thermoplastic resin (A) on the surface of an electrophotographic photosensitive member, and to provide on the layer. A non-fixed toner image is formed using a liquid developer by an electrophotographic process, the toner image is transferred together with the transfer layer (T) onto a primary receptor, and then transferred onto a lithographic printing plate support, and further, The adhesive force to the surface of the transfer layer (T) on the entire surface of the transfer layer (T) on the support on which the toner image is formed is
A method for producing an electrophotographic waterless lithographic printing plate, which comprises providing a non-adhesive resin layer having a larger adhesion to the toner image and then selectively removing the non-adhesive resin layer on the toner image. Have been found to be achieved by.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Preparation of the waterless planographic printing plate of the present invention is carried out through a process as shown in FIG. First,
A transfer layer (T) 12 is formed on the electrophotographic photoreceptor 11 (a), a non-fixed toner image 5 is formed thereon by an electrophotographic process (b), and then a toner image is formed together with the transfer layer (T) 12. 5 is once transferred to the primary receptor (also referred to as an intermediate transfer medium) 20 (c), and then the transfer layer (T) 12 and the toner image 5 are transferred onto the lithographic printing plate support 30 (d).

Next, the non-tacky resin layer 6 is adhered to the entire surface of the transfer layer (T) 12 and the toner image 5 on the lithographic printing plate support so as to adhere more strongly to the transfer layer surface than to the toner image 5. (E) is provided, and the non-adhesive resin layer on the toner image is selectively removed by utilizing the difference in the adhesive force (f) to prepare a waterless planographic printing plate.

In the present invention, since the adhesive force between the non-adhesive resin layer and the transfer layer (T) in the non-image portion is larger than the adhesive force between the toner image and the non-adhesive resin layer, even a minute image portion can be selected. Easily and easily, and a toner image is formed on the transfer layer on the photoconductor, and the toner image is formed together with the transfer layer.
By transferring onto the lithographic printing support through the primary receptor, the toner image can be completely transferred as compared with the case where the toner image is transferred alone, and the plate making image quality and the printing image quality are remarkably excellent, and particularly high definition images are obtained. The image can be reproduced faithfully.

In the present invention, the non-fixed toner image is formed on the resin layer of the transfer layer (T) of the lithographic printing plate support, and the non-adhesive resin layer and the transfer layer on the lithographic printing plate support are further formed. The non-adhesive resin layer is adjusted and provided so that the adhesive force of is larger than the adhesive force between the toner image and the non-adhesive resin layer. Specifically, the force required to peel off the interface between the non-adhesive resin layer in the non-image part and the transfer layer (T) on the lithographic printing plate support (the adhesive force between the non-adhesive resin layer and the transfer layer). )But,
Adhesive force measured based on JIS Z0237-1980 "Adhesive tape / adhesive sheet test method" is 200gram force (gf)
As described above, the force required for peeling the non-adhesive resin layer in the image part from the transfer layer (T) (adhesive force between the toner image and the non-adhesive resin layer) is 20 g · f or less in terms of the above-mentioned adhesive force. It is preferable to adjust so. More preferably, the adhesive strength in the non-image area is 300 g · f or more, and the adhesive strength in the image area is 5 g · f or less.

Thus, the difference in the adhesive strength between the non-adhesive resin layer in the non-image area and the image area can be remarkable, and the toner image area is not damaged without damaging the non-adhesive resin layer surface in the non-image area. The upper non-adhesive resin layer can be selectively removed.

The adhesive strength of the non-tacky resin layer is determined by JI
S Z0237-1980 `` Testing method for adhesive tape and adhesive sheet '' 8.3.
Measure according to the 180-degree peeling method of 1 with the following modifications. A support for a lithographic printing plate having a non-adhesive resin layer coated on a transfer layer (T) is used as a "test plate" in the non-image area. As a "test plate" of the image area, a support for a lithographic printing plate having a non-adhesive resin layer coated on one surface with toner development is used. As the “test piece”, a 3M silicone adhesive tape (# 851A) having a width of 25 mm is used. Peel off at a speed of 25 mm / min using a constant speed tension type tensile tester.

That is, the roller is reciprocated once at a speed of about 300 mm / min from above the test piece with the adhesive side of the test piece facing down on the test plate. The non-adhesive resin layer is peeled off by about 25 mm using a constant-speed tension type tensile tester for 20 to 40 minutes after the pressure bonding, and then peeled off at a rate of 25 mm / min. 5
The force is read each time the mm is peeled off, for a total of four readings. The test is performed on three test pieces, and an average value of twelve pieces measured from the three test pieces is obtained, and this is converted into a proportional value per 10 mm width.

In the present invention, the adhesiveness between the lithographic printing plate support and the transfer layer is 500 g · f or more, particularly 800 g · f or more in terms of the above-mentioned adhesive force. Further, since the adhesive force between the transfer layer and the non-adhesive resin layer is retained and the adhesiveness is sufficient,
The film strength of the non-image area is maintained against the tacking force and printing pressure of the ink during printing, and the printing durability is significantly improved. In addition, since the adhesion between the toner image and the transfer layer on the lithographic printing plate support is small, the image area can be easily removed, no extra steps or devices are required, and the speed of image formation, labor saving, and device Can be made smaller. In the present invention, it is preferable to remove the toner image portion of the printing original plate provided with the non-adhesive resin layer by a dry method. Thereby, the non-adhesive resin layer on the image portion can be more selectively and easily removed by cohesive failure of the toner image. For example, a non-adhesive resin layer pattern can be easily formed by applying an external force by peeling, brushing or the like.

Further, in the present invention, it is preferable that the surface of the transfer layer (T) on the lithographic printing plate support contains a reactive group capable of chemically bonding at the interface with the non-adhesive resin layer. As a result, the transfer layer (T) on the lithographic printing plate support and the non-adhesive resin layer in the non-image area chemically react at least at the interface to form a crosslinked structure, and good adhesiveness is maintained, and the image is improved. It is possible to further increase the adhesive strength of the non-adhesive resin layer between the portion and the non-image portion.

The present invention will be described in more detail below. The constitution and material of the electrophotographic photosensitive member (hereinafter, also simply referred to as a photosensitive member) to be used in the present invention may be any conventionally known one and are not limited. Examples of photoconductors include "Basics and Applications of Electrophotographic Technology" edited by The Electrophotographic Society (Corona Publishing (1988)), Hiroshi Komon, "Recent Developments and Practical Applications of Photoconductive Materials and Photoconductors" (Japanese Science) Information (published in 1985), Ryuji Shibata / Jiro Ishiwatari, Polymer, Volume 17, 278 (1968), Harumi Miyamoto, Hidehiko Takei, Imaging, 1973 (No.8), The Institute of Electrophotography Ed. "Present Symposium on Organic Photoreceptors for Electrophotography" Proceedings (1985), RM Schaffert, "Electrophot
ography "Focal Press London (1980), SW Ing, M.
D. Tabak, WE Hass, "Electrophotography Fourth In
ternational Conference "SPSE (1983), Isao Shinohara, Hidetoshi Tsuchida, Hideaki Kusagawa" Recording Materials and Photosensitive Resins, "Published by Japan Society Publishing Center (1979), Hiroshi Komon, Chemistry and Industry, 39
(3), 161 (1986) and the like.

That is, a single layer composed of the photoconductive compound itself or a photoconductive layer in which the photoconductive compound is dispersed in a binder resin can be used. The dispersed photoconductive layer can be either a single layer type or a laminated type. May be. Further, the photoconductive compound used in the present invention may be either an inorganic compound or an organic compound.

In the present invention, the inorganic compound used as a photoconductive compound includes, for example, zinc oxide, titanium oxide, zinc sulfide, cadmium sulfide, selenium, selenium-tellurium, amorphous silicon and lead sulfide. And a conductive compound. These may form the photoconductive layer together with the binder resin, or may form the photoconductive layer alone by vapor deposition or sputtering.

When an inorganic photoconductive compound such as zinc oxide or titanium oxide is used, the binder resin is 10 to 100 parts by weight, preferably 1 part by weight, relative to 100 parts by weight of the inorganic photoconductive compound.
Use 5 to 40 parts by weight.

On the other hand, the organic compound may be any of the conventionally known compounds. Specifically, the organic compound has a photoconductive layer mainly composed of an organic photoconductive compound, a sensitizing dye, and a binding resin. Examples thereof include those having a photoconductive layer mainly composed of a charge generating agent, a charge transporting agent, and a binding resin, and a two-layered photoconductive layer containing a charge generating agent and a charge transporting agent in separate layers.

The electrophotographic photosensitive member of the present invention may take any form of the above-mentioned photoconductive layer.

In the case of the second example, the organic photoconductive compound functions as a charge transport agent. Examples of the organic photoconductive compound include triazole derivatives, oxadiazole derivatives, imidazole derivatives, polyarylalkane derivatives, pyrazoline derivatives, pyrazolone derivatives, arylamine derivatives, azurenium salt derivatives, amino-substituted chalcone derivatives, and N, N-bicarbazyl derivatives. Oxazole derivative, styryl anthracene derivative, fluorenone derivative, hydrazone derivative, benzidine derivative, stilbene derivative, polyvinyl carbazole and its derivatives, polyvinyl pyrene, polyvinyl anthracene, poly-2-vinyl-4- (4'-dimethylaminophenyl)
-5-phenyl-oxazole, poly-3-vinyl-N
-Polymers such as vinyl polymers such as ethylcarbazole, polyacenaphthylene, polyindene, copolymers of acenaphthylene and styrene, triphenylmethane polymer, pyrene-formaldehyde resin, bromopyrene-formaldehyde resin, ethylcarbazole-formaldehyde resin, etc. And condensation resins.

In the present invention, the organic photoconductive compound is not limited to these compounds, and all known organic photoconductive compounds can be used. These organic photoconductive compounds can be used in combination of two or more in some cases.

As the charge generating agent contained in the photoconductive layer, various organic and inorganic charge generating agents known in the prior art for electrophotographic photoreceptors can be used. For example, selenium, selenium-tellurium, cadmium sulfide, zinc oxide and the organic pigments exemplified below can be used, and these are arbitrarily selected as a charge generating agent having a spectral sensitivity suitable for a wavelength range of a light source using the same.

Examples of organic pigments include azo pigments such as monoazo, bisazo, trisazo and tetraazo pigments, phthalocyanine pigments such as metal-free or metal phthalocyanines, perylene pigments, indigo and thioindigo derivatives.
Examples thereof include quinacridone pigments, polycyclic quinone pigments, bisbenzimidazole pigments, squarium salt pigments, and azurenium salt pigments. These can be used alone or in combination of two or more.

When a charge transporting agent is further used in combination, a compound having a good compatibility with the type of charge generating agent used in combination is selected. Specifically, it is known as the organic photoconductive compound described above. The compound group mentioned is mentioned. The upper limit of the content of the organic photoconductive compound is determined by the compatibility between the organic photoconductive compound and the binding resin. Crystallization of the compound occurs, which is not preferable. Since the electrophotographic sensitivity decreases as the content of the organic photoconductive compound decreases, it is preferable to include as many organic photoconductive compounds as possible within the range where crystallization of the organic photoconductive compound does not occur. The content of the organic photoconductive compound is 5 to 120 parts by weight, preferably 10 to 100 parts by weight, based on 100 parts by weight of the binder resin. The organic photoconductive compounds may be used alone or in combination of two or more.

The binder resin that can be used for the photoreceptor is
Any of the resins used in conventionally known electrophotographic photoreceptors
And the weight average molecular weight is preferably 5 × 10^Three~ 1 ×
10 ⁶, More preferably 2 × 10^Four~ 5 × 10^FiveWith
is there. Further, the glass transition point of the binder resin is preferably −4.
0 ° C to + 200 ° C, more preferably -10 ° C to +140.
° C.

As the binder resin, for example, a review article cited in the above-mentioned photoreceptor, edited by Koichi Nakamura, "Practical Technology of Binders for Recording Materials", Chapter 10, CMC Publishing (1985), Takeshi Endo "Thermosetting Polymer" Precision ”(CMC Corporation, 1986),
Yuji Harazaki, "Handbook of the Latest Binder Technologies", Chapter II-1 (General Technology Center, 1985), Takayuki Otsu "Synthesis, Design and New Application Development of Acrylic Resin" (Chubu Business Development Center, Publishing Division, 1985), Ei Omori Three “functional acrylic resin”
(Techno System, 1985), D. Tatt, SCHeidec
ker, Tappi, 49 , (No.10), 439 (1966), ES Baltazzi,
RG Blanclotte et al., Phot.Sci. Eng. 16 (No.
5), 354 (1972), Nguyen Chan K, Isamu Shimizu, Eiichi Inoue, and other books such as Journal of the Institute of Electrographic Photography 18 (No.2), 22 (1980).
Examples include the compounds described in the reviews.

Specifically, olefin polymers and copolymers, vinyl chloride copolymers, vinylidene chloride copolymers, vinyl alkanoate polymers and copolymers, allyl alkanoate polymers and copolymers, styrene and Polymers and copolymers of the derivatives, butadiene-styrene copolymer, isoprene-styrene copolymer, butadiene-unsaturated carboxylic acid ester copolymer, acrylonitrile copolymer, methacrylonitrile copolymer, alkyl vinyl ether copolymer Polymer, acrylate polymer and copolymer, methacrylate polymer and copolymer, styrene-acrylate copolymer, styrene-methacrylate copolymer, itaconic diester polymer and copolymer , Maleic anhydride copolymer, acrylamide copolymer, methacrylamide Polymer, hydroxyl-modified silicone resin, polycarbonate resin, ketone resin, polyester resin, silicone resin, amide resin, hydroxyl and carboxyl group-modified polyester resin, butyral resin, polyvinyl acetal resin, cyclized rubber-methacrylate copolymer, ring Rubber-acrylate copolymers, copolymers containing a nitrogen-free heterocycle (for example, as a heterocycle, a furan ring, a tetrahydrofuran ring, a thiophene ring, a dioxane ring, a dioxofuran ring, a lactone ring, a benzofuran ring, Benzothiophene ring, 1,3-dioxetane ring, etc.), epoxy resin and the like.

In particular, by using a resin having a relatively low molecular weight (about 10 ³ to 10 ⁴ ) containing an acidic group such as a carboxyl group, a sulfo group, or a phosphono group as a binder resin for the photoconductor, Electrical characteristics can be improved. For example, JP-A-64-70761, JP-A-2-67563, JP-A-3-181948, JP-A-3-24959 and the like can be mentioned.

Also, by using a specific medium to high molecular weight resin, stable performance can be maintained even when the environment fluctuates significantly. For example, Japanese Patent Application Laid-Open No. 3-29954
No. 3-77954, No. 3-92961 and No. 3
JP-A-353257 describes a resin which binds an acidic group to the end of a graft portion of a graft copolymer or a resin which contains an acidic group in a graft portion of a graft copolymer.
Graft copolymers containing an AB block copolymer comprising an acidic group-containing A block and an acidic group-free B block described in JP-A-066464 and JP-A-3-223762 in a graft portion. By using these resins, the photoconductor can be uniformly dispersed and a photoconductive layer having good smoothness can be formed, and in the case of using a scanning exposure method using environmental changes or semiconductor laser light. Also, excellent electrostatic characteristics can be maintained.

In the present invention, various dyes can be used as spectral sensitizers as needed depending on the type of light source such as exposure to visible light or exposure to semiconductor laser light. For example, the above-mentioned review and literature on electrophotographic photoreceptors, "Electrophotography" 12 , 9 (1973), "Synthetic Organic Chemistry" 24 (11), 1010
(1966), Harumiya Miyamoto, Hidehiko Takei; Imaging 1973 (N
o.8) Page 12, CJ Young et al .: RCA Review 15 , p. 469
(1954), Kyohei Kiyota: Transactions of the Institute of Electrical Communication, J63- C (N
o.2), p. 97 (1980), Yuji Harazaki et al., Industrial Chemistry Magazine, 6
6 , 78 and 188 (1963), Tadaaki Tani, Journal of the Photographic Society of Japan 3
5 , 208 pages (1972), "Research Disclosure" 1982
Year, 216, 117-118, FM Hamer `` The Cyanine Dye
and carbon compounds, diphenylmethane dyes, triphenylmethane dyes, xanthene dyes, phthalein dyes, polymethine dyes (for example, oxonol dyes, merocyanine dyes, cyanine dyes, rhodacyanine dyes, styryl dyes, etc.) ), Phthalocyanine dyes (which may contain metals) and the like.

Furthermore, if necessary, various conventionally known electrophotographic photoreceptor additives can be used. These additives include a chemical sensitizer for improving electrophotographic sensitivity, various plasticizers for improving film properties, and a surfactant.

Examples of the chemical sensitizer include halogen, benzoquinone, chloranil, fluoranyl, bromanyl,
Dinitrobenzene, anthraquinone, 2,5-dichlorobenzoquinone, nitrophenol, tetrachlorophthalic anhydride, phthalic anhydride, maleic anhydride, N-hydroxymaleimide, N-hydroxyphthalimide, 2,
Electron-withdrawing compounds such as 3-dichloro-5,6-dicyanobenzoquinone, dinitrofluorenone, trinitrofluorenone, tetracyanoethylene, nitrobenzoic acid, dinitrobenzoic acid, etc .; Development and Practical Use ”Chapters 4-6: Japan Science Information Co., Ltd.
Examples include polyarylalkane compounds, hindered phenol compounds, p-phenylenediamine compounds, and the like, which are reviewed in the publication section (1986). Also, JP-A-58-65
No. 439, No. 58-102239, No. 58-1294
Compounds described in JP-A No. 39, 62-71965 and the like can also be mentioned.

Examples of the plasticizer include dimethyl phthalate, dibutyl phthalate, dioctyl phthalate, diphenyl phthalate, triphenyl phosphate, diisobutyl adipate, dimethyl sebacate, dibutyl sebacate, butyl laurate, methyl phthalyl glycolate, dimethyl glycol phthalate. Can be added to improve the flexibility of the photoconductive layer. These plasticizers are preferably contained in a range that does not deteriorate the electrostatic properties of the photoconductive layer.

The addition amount of these various additives is not particularly limited, but usually 0.0 to 100 parts by weight of the photoconductor.
01 to 2.0 parts by weight.

The thickness of the photoconductive layer is from 1 to 100 μm, especially 10 μm.
~ 50μ is preferred. When a photoconductive layer is used as the charge generation layer of the photoreceptor having the charge generation layer and the charge transport layer, the thickness of the charge generation layer is 0.01 to 5 μm, particularly 0.0 to 5 μm.
5-2μ is preferred.

The electrophotographic photosensitive layer can be provided on a conventionally known support. In general, the support of the electrophotographic photosensitive layer is preferably conductive. As the conductive support, a substrate such as a metal, paper, or a plastic sheet is impregnated with a low-resistance substance in the same manner as in the related art. The above-mentioned support, a substrate coated with at least one layer for the purpose of imparting conductivity to the back surface of the substrate (the surface opposite to the surface on which the photosensitive layer is provided) and further preventing curling, etc. A substrate provided with a water-resistant adhesive layer on its surface, a substrate provided with at least one or more precoat layers as required on the surface layer of the support, a substrate obtained by laminating a base conductive plastic on which aluminum or the like is deposited on paper. Etc. can be used.

Specifically, as an example of a conductive substrate or a conductive material, Yukio Sakamoto, Electrophotography, 14 (No. 1), 2 to 11
Page (1975), Hiroyuki Moriga "Introduction to Special Paper Chemistry" Polymer Publishing Association (1975), MF Hoover, J. Macromol. Sc
Those described in i. Chem. A-4 (6), pages 1327 to 1417 (published in 1970) and the like are used.

Further, the surface of the electrophotographic photosensitive member used in the present invention has an adhesive force of 20 gram · force measured according to JIS Z0237-1980 “Adhesive tape / adhesive sheet test method”.
It is preferably (g · f) or less, more preferably 10 g · f or less. By adjusting the adhesive force in this manner, the transfer layer and the toner image formed on the photoconductor can be easily peeled and transferred collectively onto the primary receptor.

The above-mentioned surface adhesive strength is measured according to JIS Z0237-1980 "Adhesive tape / adhesive sheet test method" 8.3.1, 180 ° peeling method, with the following modifications. An electrophotographic photosensitive member on which a transfer layer is to be formed is used as a “test plate”. An adhesive tape having a width of 6 mm and manufactured according to JIS C 2338-1984 is used as a "test piece". Peel off at a speed of 120 mm / min using a constant speed tension type tensile tester.

That is, with the adhesive surface of the test piece facing downward, the roller is reciprocated from above the test piece at a speed of about 300 mm / min to make one reciprocation on the test plate. In a period of 20 to 40 minutes after the crimping, the film is peeled off at a speed of 120 mm / min after peeling off about 25 mm using a constant-speed tension type tensile tester. The force is read every 20 mm peeling, and it is read four times in total. The test is performed on three test pieces, and an average value of twelve pieces measured from the three test pieces is obtained, and this is converted into a proportional value per 10 mm width.
The surface adhesion of the primary receptor and the lithographic printing plate support can be measured in the same manner.

The better the surface smoothness of the photoreceptor, the easier it is for the transfer layer to be transferred. Therefore, the "arithmetic mean roughness (Ra)" defined in JIS B0601 is defined by the touch described in JIS B0651. The value obtained by measuring with a needle type surface roughness measuring device is 2.0 μm or less (however, cutoff value (λ _c ) 0.16 m
m, evaluation length (ln) 2.5 mm}, and particularly preferably 1.5 μm or less.

In the present invention, as the electrophotographic photosensitive member, one having a surface releasability in advance may be used, but the transfer layer (T)
Before forming the compound, a desired release property may be imparted to the surface of the photoconductor by applying a compound (S) containing at least a fluorine atom and / or a silicon atom to the surface of the photoconductor. As a result, an ordinary electrophotographic photoreceptor can be used without considering the releasability of the electrophotographic photoreceptor surface.

Further, when the electrophotographic photosensitive member having a releasability in advance is repeatedly used in the present invention, the compound (S) may be applied when the releasability of the surface of the photoreceptor is lowered. This makes it possible to easily maintain the releasability of the photoconductor surface. The imparting of the releasability to the electrophotographic photosensitive member is preferably performed in a toner image transfer device, and the means for applying the compound (S) to the surface of the electrophotographic photosensitive member can be appropriately set in an electrophotographic process device. .

In order to obtain a photoreceptor having a releasable surface, specifically, a method using a photoreceptor having a releasable surface in advance, and the above compound (S) on the surface of a commonly used electrophotographic photoreceptor are used. A method of imparting releasability to the surface of the photoreceptor by applying it can be mentioned.

An example of a photoconductor having a peelable surface in advance that can be used in the former method is one in which a photoconductor in which the surface of amorphous silicon is modified to have a peelable property is used. As a method for modifying the surface of an electrophotographic photoreceptor mainly containing amorphous silicon to have releasability, a coupling agent containing a fluorine atom and / or a silicon atom (such as a silane coupling agent or a titanium coupling agent) is used. There is a method of treating the surface of an amorphous silicon layer, which is disclosed in JP-A-55-89844 and JP-A-4-231.
No. 318, JP-A-60-170860 and JP-A-59-10
Nos. 2244 and 60-17750. Further, as another method, a compound (S) described later,
In particular, a method of adsorbing and fixing a compound containing a component containing a fluorine atom and / or a silicon atom as a substituent (for example, a modified polydialkyl silicon such as polyether, carboxylic acid, amino group, carbinol, etc.) can be mentioned. Can be

As another example of the photoreceptor having a releasable surface, the electrophotographic photoreceptor contains at least one of a silicon atom and a fluorine atom in the vicinity of its surface (containing a silicon atom and / or a fluorine atom). Examples include those containing a polymer containing a coalescing component. Here, the vicinity of the surface of the electrophotographic photoreceptor means the uppermost layer of the photoreceptor, and includes an overcoat layer provided on the photoconductive layer and the uppermost photoconductive layer. That is, an overcoat layer is provided as the uppermost layer of the photoconductor having a photoconductive layer, and the polymer is added to the overcoat layer to impart releasability, or a photoconductive layer (single photoconductive layer and laminated light The above-mentioned polymer may be contained in the uppermost layer of any of the conductive layers), and the surface thereof may be modified so as to exhibit releasability.

To impart releasability to the overcoat layer or the uppermost photoconductive layer, a polymer containing a silicon atom and / or a fluorine atom may be used as a binder resin for the layer. Alternatively, it is also preferable to use a block copolymer (surface unevenly distributed copolymer) containing a polymer segment composed of a polymer component containing a silicon atom and / or a fluorine atom as described in detail below together with another binder resin. . Further, the resin containing a silicon atom and / or a fluorine atom can be used in the form of particles.

In particular, when an overcoat layer is provided, the surface unevenly distributed copolymer is used in combination with another binder resin in order to sufficiently maintain the adhesion between the photoconductive layer and the overcoat layer to be combined. Is also used. The above surface uneven distribution type copolymer can be used usually in a proportion of 0.1 to 95 parts by weight based on 100 parts by weight of the total composition of the overcoat layer.

Such an overcoat layer is specifically known as one means for maintaining the durability of the surface of the PPC photoreceptor using a dry toner against repeated use of the photoreceptor. Examples thereof include a protective layer used for providing a surface layer on the photoreceptor to protect it. For example, as a technique relating to a protective layer using a silicone-based block copolymer, JP-A-61-95358,
Nos. 55-83049, 62-87971, 61
No. 189559, No. 62-75461, No. 61-1
39556, 62-139557, 62-20
No. 8055 and the like. Further, a protective layer using a fluorine-based block copolymer is disclosed in
1-1116362, 61-117563, 61
-270768 and 62-14657. Further, as a protective layer using a resin containing a fluorine atom-containing polymer component in the form of particles, those described in JP-A-63-249152 and JP-A-63-221355 can be mentioned. Further, a resin layer having the same content as the non-adhesive resin layer of the present invention described later can be used as the peelable overcoat layer.

The method of modifying the surface of the uppermost photoconductive layer to a state in which the releasability is developed is effective when a so-called dispersion type photoconductor using at least a photoconductor and a binder resin is used. Applied to That is, in the layer constituting the uppermost layer of the photoconductive layer, a resin of a block copolymer containing, as a block, a polymer segment containing a polymer component containing a silicon atom and / or a fluorine atom, and silicon atom and / or By coexisting at least one of the resin particles containing the fluorine-containing polymer component, these materials are concentrated and migrated to the surface and unevenly distributed, so that the surface can be modified into a peelable surface. Examples of the copolymer and resin particles include those described in JP-A-5-197169.

In order to further enhance the uneven distribution of the surface,
As a binder resin for the overcoat layer and the uppermost photoconductive layer,
It is possible to use a block copolymer obtained by bonding at least one type of polymer segment containing a silicon atom and / or fluorine atom and a polymer segment containing a heat and / or photocurable group-containing component with a block. it can. Examples of the polymer segment containing the heat and / or photocurable group-containing component include those described in JP-A-5-197169. Alternatively, a light and / or thermosetting resin may be used together with a fluorine atom and / or silicon atom containing resin.

The polymer containing a polymer component containing a silicon atom and / or a fluorine atom of the present invention, which is effective for modifying the surface of the photoreceptor by such a method, is a resin (hereinafter referred to as resin (P)). Or resin particles (hereinafter referred to as resin particles (PL)
).

When the polymer is a random copolymer, the proportion of the polymer component containing silicon atoms and / or fluorine atoms is preferably at least 60% by weight, more preferably at least 80% by weight of the total polymer components. It is. Preferably, the polymer component containing a silicon atom and / or a fluorine atom is 5
0 to 20% by weight of a polymer segment (α) containing 0% by weight or more and a polymer component containing silicon and / or fluorine atoms
It is a block copolymer in which the contained polymer segment (β) is bonded by blocks. More preferably, it is a block copolymer containing at least one polymer component containing a light and / or thermosetting functional group in the segment (β) in the block copolymer. In these block copolymers, it is preferable that the segment (β) does not contain any polymer component containing a fluorine atom and / or a silicon atom.

When a block copolymer containing the polymer segments (α) and (β) (a surface uneven distribution type copolymer) is used, the releasability of the surface itself is improved as compared with a random copolymer. Peelability is maintained. That is, when a coating film is formed in the presence of a small amount of a fluorine- and / or silicon-atom-containing block copolymer, these are easily transferred and concentrated to the surface of the film before the drying step after coating. Then, the surface of the film is modified so that the film can exhibit peelability. Further, such a copolymer is cross-linked at the surface portion of the membrane and is sufficiently fixed.

As described above, when the polymer segment (α) containing a fluorine atom and / or a silicon atom is blocked in the resin (P), the other polymer atom containing a fluorine atom and / or a silicon atom is blocked. Even if the transfer layer is formed, the polymer segment (β) containing a small amount of the polymer component has a good compatibility with the binder resin for forming the film because of its good compatibility with the binder resin. The transfer of the resin to the transfer layer is suppressed or eliminated, so that the interface between the transfer layer and the electrophotographic photosensitive member can be clearly formed and maintained (namely, the anchor effect). By using a polymer containing a curable group in the segment (β) of the block copolymer and crosslinking between the polymers at the time of film formation, an effect of further maintaining the interface with the photoreceptor clearly is exhibited. .

As described above, the polymer may be used as resin particles (PL). In the case of resin particles (PL),
Transfer and concentration to the surface are performed by the action of the insolubilized polymer segment (α), and the polymer segment (β) soluble in the non-aqueous solvent bound to the particles is, as in the case of the resin, It interacts with the binder resin to perform an anchor effect. Further, when the curable group is contained in the polymer or the binder resin, transfer to the transfer layer is eliminated.

The polymer component containing a substituent containing a fluorine atom and / or a silicon atom contains the substituent as a substituent on the side chain of the polymer even if the substituent is incorporated in the polymer main chain. It may be. Specific embodiments of the above compounds are described, for example, in JP-A-5-197169.

Next, in the latter method of obtaining a photoreceptor having a releasable surface, the releasable compound (S) is applied onto the surface of a usual electrophotographic photoreceptor before the transfer layer is formed. A method for making the surface peelable will be described.

The compound (S) includes a fluorine atom and / or
Or a compound containing at least a silicon atom, as long as it improves the releasability of the electrophotographic photoreceptor surface, the structure is not particularly limited, and may be any of a low-molecular compound, oligomer, or polymer. . In the case of an oligomer or polymer, the substituent containing a fluorine atom and / or a silicon atom may be incorporated into the main chain of the polymer, or may be present as a substituent on the side chain of the polymer. Preferably, an oligomer or a polymer containing a repeating unit containing such a substituent as a block is mentioned, and these are excellent in adsorptivity to the surface of the electrophotographic photoreceptor and particularly effectively exhibit releasability.

In the case of a block copolymer, a polymer component containing a fluorine atom and / or a silicon atom may be constituted by a block. Here, “constituting by a block” means that a component having a fluorine atom and / or a silicon atom
It means that the polymer has a polymer segment containing 0% by weight or more, for example, AB type block, AB
-A type block, BAB type block, graft type block or star type block.

As the compound (S) containing a fluorine atom and / or a silicon atom used in the present invention, specifically,
"New edition surfactant surfactant handbook" edited by Tokiyuki Yoshida, etc., published by Kogyo Tosho Co., Ltd. (1987), supervised by Takao Karimei "Latest surfactant application technology", CMC Corporation (1990), edited by Kunio Ito "Silicone Handbook" published by Nikkan Kogyo Shimbun (19
1990), supervised by Takao Karimei "Specially Functional Surfactant" C.
MC (1986), AM Schwartz et al., "Surface Ac
tive Agents and Detergents vol. II "and the like.

Further, Nobuo Ishikawa, "Synthesis and Function of Fluorine Compounds", CMC Co., Ltd. (1987), edited by Jiro Hirano et al., "Fluorine-Containing Organic Compounds-Synthesis and Application-", Technical Information Association, Ltd. (1991) , "Organic Silicon Strategic Materials", supervised by Mitsuo Ishikawa, No. 3
The compound (S) of the present invention that satisfies the above-mentioned properties can be synthesized using a synthesis method described in a literature such as Chapter Science Forum (1991).

By applying the compound (S) to the surface of the electrophotographic photosensitive member, the surface is modified so as to have a desired releasability. Compound (S) on the surface of electrophotographic photoreceptor
Applying means that the compound (S) is supplied to the surface of the electrophotographic photosensitive member to form a state in which the compound (S) is adsorbed or adhered to the surface of the photosensitive member.

For applying the compound (S) to the surface of the electrophotographic photosensitive member, any conventionally known method may be applied. For example, Yuji Harasaki “Coating Engineering” Asakura Shoten (19
71), Yuji Harasaki “Coating Method” Maki Shoten (1979)
Air Doctor Coater, Blade Coater, Knife Coater, Squeeze Coater, Impregnation Coater, Reverse Roll Coater, Transfer Roll Examples include a coater, a gravure coater, a kiss roll coater, a spray coater, a curtain coater, and a calendar coater.

Further, cloth, paper, and the like impregnated with the compound (S)
A method of bringing felt or the like into close contact with the photoreceptor, a method of pressing a curable resin impregnated with the compound (S) against the photoreceptor, drying the solvent after wetting the photoreceptor with a non-aqueous solvent in which the compound (S) is dissolved And a method in which the non-aqueous solvent in which the compound (S) is dispersed is electrophoresed and adhered to the photoreceptor.

Further, after the non-aqueous solution of the compound (S) is uniformly wetted on the surface of the photoreceptor by an ink jet method, it can be adsorbed or adhered by drying.
The method using the ink jet method is described in, for example, "Non-impact Printing" edited by Shin Ohno, CMC (1986)
Annual publication). For example, continuous injection type Sweet method, Hertz type, intermittent injection type Wins
Examples include a ton method, an ink-on-demand type pulse jet method, a bubble jet method, and an ink mist type mist method.

Silicone rubber can be used as the compound (S). Preferably, a silicone rubber roller is wound around a metal core roller, which may be directly pressed against the surface of the photoreceptor. The nip pressure may be 0.5 to 10 kgf / cm ² , and the contact time may be 1 second to 30 minutes. At this time, the photoconductor and / or the silicone rubber roller may be heated to 150 ° C. or lower. It is considered that a part of the low molecular weight component in the silicone rubber is transferred from the roller surface to the photoreceptor surface by the pressing. The silicone rubber may be swollen with silicone oil. The silicone rubber may be in the form of a sponge, or the sponge roller may be further impregnated with a silicone oil, a silicone surfactant solution or the like.

In the present invention, these methods are not particularly limited, and various methods are selected depending on the state of the compound (S) to be used (liquid, waxy or solid). If necessary, a heating medium may be used in combination. Thus, the fluidity of the compound (S) used can be adjusted. The amount of the compound (S) applied to the surface of the photoconductor is not particularly limited, and the adverse effect on the electrophotographic characteristics of the photoconductor should not be a practical problem.
Usually, a coating film thickness of 1 μm or less is sufficient, and the release property of the present invention is expressed by “Weakboundary Layer” (Bikerman “The Sci
ence of Adhesive Joints "Academic Press (published in 1961) is sufficient. In the present invention, the compound (S) is applied onto the electrophotographic photoreceptor to impart releasability to the surface, preferably The surface adhesion of the photoconductor is 20
It should be gf or less.

In the printing plate making process of the present invention, it is not necessary to repeat this process all the time, and it may be appropriately performed according to the combination of the photoreceptor and the ability to maintain the releasability by application of the compound (S) and the means thereof. About the specific example of such a compound (S) and the specific aspect of its application,
It is described in JP-A-7-5727.

In the present invention, the transfer layer (T) is formed on the surface-peeling photosensitive member as described above. Preferably, it is performed in the same apparatus as the electrophotographic process or the transfer process. The transfer layer of the present invention is mainly composed of a thermoplastic resin (A), is light transmissive, and is transmissive to at least a part of wavelength light in the spectral sensitivity region of the electrophotographic photoreceptor. So long as it is not particularly limited, it may be colored. When it is necessary to inspect the transferred image on the lithographic printing plate support, the color of the color toner image may be different.

The transfer layer of the present invention is subjected to a transfer condition of a temperature of 180 ° C. or lower and / or a pressure of 20 kgf / cm ² or lower, more preferably 160 ° C. or lower and / or a pressure of 10 kgf / cm ² or lower. It is preferably peelable. If the value is equal to or less than the above value, there is almost no need to increase the size of the transfer device in order to maintain the heat capacity and pressure of the transfer device in order to peel and transfer the transfer layer from the photoreceptor surface. It can be done without any practical problems. Although the lower limit is not particularly limited, it is usually a temperature equal to or higher than room temperature or 1
A transfer layer that can be peeled off under a transfer condition of a pressure of 00 gf / cm ² or more is preferable. Therefore, the resin (A) as a main component constituting the transfer layer used in the present invention preferably has a glass transition point of 90 ° C. or lower or a softening point of 100 ° C. or lower, and more preferably a glass transition point of 80 ° C. or lower or a softening point of 90. It is a thermoplastic resin of ℃ or less.

As the resin (A), it is preferable to use at least two kinds of resins having different glass transition points or softening points in combination. In particular, a resin (AH) having a glass transition point of 25 ° C. to 90 ° C. or a softening point of 35 ° C. to 100 ° C. and a glass transition point of 30
It is preferable that the resin is mainly composed of a resin (AL) having a softening point of 45 ° C. or lower, and a glass transition point or a softening point difference between the resin (AH) and the resin (AL) is 2 ° C. or higher.

Further, the resin (AH) preferably has a glass transition point of 28 ° C. to 60 ° C. or a softening point of 38 ° C. to 80 ° C., more preferably a glass transition point of 30 ° C. to 50 ° C. or a softening point of 40 ° C. to 70 ° C. C, and the resin (AL) preferably has a glass transition point of -50 ° C to + 28 ° C or a softening point of -30 ° C.
To + 40 ° C., more preferably a glass transition point of −20.
° C to + 23 ° C or a softening point of 0 ° C to 35 ° C.

More preferably, the glass transition point or softening point of the resin (AL) is lower than that of the resin (AH) by 5 ° C. or more. Here, the difference between the glass transition point or the softening point in the case where two or more kinds of the resin (AH) or the resin (AL) are contained is the difference between the resin (AH) having the lowest glass transition point or the softening point and the resin (AH). (AL) is the difference from the one having the highest glass transition point or softening point in (AL).

Resin (AH) and resin (A
The proportion of L) to L) is preferably 5 to 90/95 to 10 (weight ratio), particularly preferably 10 to 70/90 to 30 (weight ratio). When the ratio of the resin (AH) / (AL) is out of the above range, the effect of the combined use is reduced.

Further, the transfer layer of the present invention comprises a first layer (first transfer layer T ₁ ) made of a resin (AH) having a high glass transition point on a photoreceptor and a resin having a low glass transition point thereon. It may be formed as a multi-layer with the second layer (second transfer layer T ₂ ) made of (AL). As a result, transferability is further improved, and the latitude of transfer conditions (heating temperature, pressure, transport speed, etc.) is further expanded.

In the present invention, the transfer layer (T) in a preferred embodiment is such that the surface of the transfer layer is chemically bonded at the interface with the non-adhesive resin layer provided on the support for a lithographic printing plate after being transferred onto the support. It is preferable to form the formed state. That is, on the surface portion of the transfer layer, there is a component containing a reactive group capable of chemically bonding to a chemically reactive group in the resin constituting the non-adhesive resin layer, and the non-adhesive resin layer and the light, heat or Moisture causes a chemical reaction to form a bridge.

Examples of these chemically reactive groups are the same as the curable reactive groups in the non-adhesive resin layer described later, and the layer forming the transfer layer contains the reactive group-containing resin. Naturally, as these reactive groups, any combination of functional groups capable of chemically reacting with the reactive groups in the non-adhesive resin layer may be used alone or in combination of two or more. it can.

The proportion of the polymer component containing these reactive groups is at least 1 in the total amount of all the components of the copolymer.
% By weight or more, preferably 5% by weight or more.

Furthermore, when these reactive group-containing resins are used in the transfer layer, it is preferable that the resin contains a polymer component containing a fluorine atom and / or a silicon atom. The fluorine atom and / or silicon atom may be contained in the reactive group-containing polymer component, or may be contained in another polymer component. As a result, these reactive group-containing resins are concentrated on the surface of the transfer layer in the process of forming the transfer layer or in the process of installing the non-adhesive resin layer due to the difference in surface free energy. Interfacial crosslinking between the adhesive resin layers can be advanced.

The fluorine atom and / or silicon atom-containing polymer component may exist in a random form or a block form. More preferably, it is a block copolymer in which a polymer segment containing a fluorine atom and / or a silicon atom is contained in a block.

As the substituent component and the block copolymer constituting the fluorine atom and / or silicon atom-containing polymer component, for example, the same ones as described in JP-A-5-197169 can be mentioned. To be When the polymer is a random copolymer, fluorine atom and /
Alternatively, the content of the polymer component containing a silicon atom is preferably at least 40% by weight or more, more preferably 60% by weight or more in the whole polymer component.

In the present invention, the above polymer contains 50 or more polymer components containing a fluorine atom and / or a silicon atom.
0 to 20% by weight of the polymer segment (α) containing not less than% by weight and the fluorine and / or silicon atom-containing polymer component.
It is preferable that the polymer segment (β) contained is a block copolymer formed by bonding with blocks. In such a block copolymer, the reactive group may be present in one or both of the polymer segment (α) and the segment (β).

The reactive group-containing polymer is used after being adjusted so that the reactive group-containing polymer component is present in an amount of 1 to 30% by weight based on all components in the layer constituting the transfer layer uppermost layer. It is preferable. In the resin (A) containing such a reactive group, when the resin (AH) and the resin (AL) having different thermophysical properties are used in combination as described above, one or both of these resins are used. May be included.

Further, in the transfer layer having a laminated structure in which the resin (AL) is mainly provided on the resin (AH), it is used as the upper layer mainly containing the resin (AL) as described above.
The weight average molecular weight of the resin (A) is preferably 1 × 10 ^3.
To 5 × 10 ⁵ , more preferably 3 × 10 ³ to 8 × 10 ^4.
It is. Here, the weight average molecular weight was measured by the GPC method and calculated in terms of polystyrene.

Specific examples of the resin (A) that can be used in the transfer layer include thermoplastic resins, resins known as adhesives or pressure-sensitive adhesives, such as olefin polymers and copolymers, and vinyl chloride. Copolymers, vinylidene chloride copolymers, vinyl alkanoate polymers and copolymers, allyl alkanoate polymers and copolymers, polymers and copolymers of styrene and its derivatives, olefin-styrene copolymers, olefins -Unsaturated carboxylic acid ester copolymer, acrylonitrile copolymer, methacrylonitrile copolymer, alkyl vinyl ether copolymer, acrylic acid ester polymer and copolymer, methacrylic acid ester polymer and copolymer, styrene- Acrylic ester copolymer, styrene-methacrylic acid ester copolymer, itaconic acid diester copolymer Body and copolymers, anhydride Marein acid copolymers, acrylamide copolymers, methacrylamide copolymers, hydroxy group-modified silicone resins, polycarbonate resins, ketone resins, polyester resins, silicone resins,
Amide resin, hydroxyl group and carboxyl group modified polyester resin, butyral resin, polyvinyl acetal resin,
Cyclic rubber-methacrylate copolymer, cyclized rubber-
Acrylic ester copolymers, heterocyclic-containing copolymers (for example, a heterocyclic ring such as a furan ring, tetrahydrofuran ring, thiophene ring, dioxane ring, dioxofuran ring, lactone ring, benzofuran ring, benzothiophene ring, 1,3- Dioxetane ring), cellulose resin,
Examples thereof include fatty acid-modified cellulose-based resins and epoxy resins.

[0094] For example, "Plastic Materials Lecture Series", Volumes 1 to 18 (1981), published by The Nikkan Kogyo Shimbun, "Polyvinyl Chloride" edited by Kinki Chemical Association Vinyl Section, published by Nikkan Kogyo Shimbun (1988), Hide Omori Three "functional acrylic resin" Co., Ltd.
Published by Techno System (1985), Eiichiro Takiyama "Polyester Resin Handbook" published by Nikkan Kogyosha (1988), Kazuo Yuki edited by "Saturated Polyester Resin Handbook" published by Nikkan Kogyo Shimbun (1989), edited by The Society of Polymer Science, "Polymer" Data Handbook <Applications>, Chapter 1, Baifukan (1986), Yuji Harazaki, “Latest Binder Technology Handbook” Chapter 2, General Technology Center (1985), Taira Okuda, Polymer Processing, Separate Volume 8 Volume 20 Special Issue “Adhesion” ”Polymer Publishing Association (1976), Keiji Fukuzawa“ Adhesion Technology ”Polymer Publishing Association (1987), Mamoru Nishiguchi“ Adhesion Handbook 14th Edition ”Polymer Publishing Association (1985) And various resins described in, for example, "Adhesion Handbook Second Edition", edited by The Japan Adhesion Association, Nikkan Kogyo Shimbun (1980).

Tree finger (A) used for the transfer layer of the present invention
Further contains a polymer component (F) containing a substituent containing a fluorine atom and / or a silicon atom, which has the effect of improving the releasability of the resin (A) itself, as the polymer component in the resin. You may. As a result, the releasability of the releasable surface from the electrophotographic photosensitive member is further improved, and as a result, the transferability is improved. Specifically, the polymer component (F) has the same content as that of the polymer component containing a fluorine atom and / or a silicon atom that can be contained in the resin (P) used in the photosensitive layer having the above-mentioned releasability. There are things. The content is preferably 3 to 40% by weight, more preferably 5 to 100 parts by weight of the total polymer components of the resin (A).
~ 25% by weight. The substituent may be incorporated in the polymer main chain of the polymer or may be present as a substituent of the side chain of the polymer. Preferably, the polymer component (F) is contained as a block in the resin (A).

Further, as described above, when the resin (A) constituting the transfer layer is composed of two or more kinds of resins having different glass transition points or softening points, these fluorine atom and / or silicon atom containing polymer components ( F) may be contained in both the high glass transition point resin (AH) and the low glass transition point resin (AL). Further, it is preferable to use a resin composed of a block copolymer containing a fluorine atom and / or a silicon atom as the resin of the first transfer layer (T ₁ ) which is in contact with the photoreceptor side when the transfer layer is used in a laminated structure. As a result, the adhesive force between the surface of the photoconductor and the transfer layer is further reduced and the transferability is improved.

In the resin (A) used for the transfer layer,
As a preferred embodiment as a so-called block copolymer, any block copolymer may be used as long as the polymer component (F) containing a fluorine atom and / or a silicon atom is blocked in the block copolymer. Here, being composed of blocks means that the fluorine atom and / or the silicon atom is 70% by weight.
It means that the polymer segment contained above is contained in the polymer, and for example, as in the case of the resin (P), an AB type block, an ABA type block, and a BA type.
-B type blocks, graft type blocks, star type blocks, and the like.

These various block copolymers (A) are
It can be synthesized according to a conventionally known polymerization method, and specifically, a resin containing a block containing a polymer component containing a fluorine atom and / or a silicon atom that imparts releasability to the surface of the electrophotographic photoreceptor. The same method as cited in (P) can be mentioned. However, it is not limited to these methods. The resin (A) is preferably used in an amount of 70% by weight or more, more preferably 90% by weight or more, based on the total amount of the compounds in the transfer layer.

Further, in order to improve various physical properties such as adhesiveness, film-forming property and film strength, other additives may be added to the transfer layer, if necessary. For example, polybutene, DOP, DBP, low molecular weight styrene resin, low molecular weight as a plasticizer and a softening agent such as rosin, petroleum resin and silicone oil for adjusting the adhesiveness, which improve the wettability to the photoreceptor and lower the melt viscosity. Polyethylene wax, microcrystalline wax, paraffin wax and the like can be added with polymeric hindered polyphenols, triazine derivatives and the like as antioxidants. For more information, see “Actual Hot Melt Adhesion” (Fukada, Polymer Publishing, 1983). 2
It is described on pages 9 to 107.

The thickness of the transfer layer is 0.1 to 10 μm as a whole.
m is suitable, and is preferably in the range of 0.5 to 8 μm, more preferably 1 to 5 μm. When the transfer layer has a laminated structure, the film thickness ratio of the first transfer layer (T ₁ ) and the second transfer layer (T ₂ ) is preferably 99 to 5/1 to 95,
More preferably, it is 95-30 / 5-70. If the film thickness is too small, transfer failure tends to occur. If the film thickness is too large, the toner image after transfer may be distorted due to the expansion and contraction of the resin of the transfer layer.

In the present invention, the peelable transfer layer is preferably formed on the photoconductor in each electrophotographic apparatus. As described above, by incorporating the transfer layer forming apparatus in the apparatus for performing the electrophotographic process, the photoreceptor can be used repeatedly in the same apparatus, and the plate making process can be continuously performed, thereby significantly reducing the cost of the printing plate. There is a merit that it can be reduced.

The forming method at the time of transfer is not particularly limited, but at least one of a hot melt coating method, an electrodeposition coating method and / or a transfer method is used to form a transfer layer on the photoreceptor in the above apparatus. Are preferably formed. These methods are preferable in that the transfer layer can be easily formed on the surface of the photoconductor in the transfer device.

Each transfer layer forming method will be described below. The hot-melt coating (hot-melt) method is a method in which the transfer layer composition is hot-melt coated by a known method.
The mechanism of the hot melt coating apparatus for hot melt adhesives (hot melt coater) described on pages 97 to 215 can be diverted to the drum coating specification of the photoreceptor. Examples include direct roll coaters, offset gravure roll coaters, lot coaters, extrusion coaters, slot orifice coaters, curtain coaters, and the like.

The melting temperature of the thermoplastic resin at the time of coating is optimized depending on the component composition of the thermoplastic resin used, but it is usually in the range of 50 to 180 ° C. It is desirable that the temperature be raised to an appropriate temperature in a short time at the position where it is applied to the photoconductor after it is melted in advance by using a preheating device having a closed automatic temperature control means. By doing so, it is possible to prevent deterioration and coating unevenness due to thermal oxidation of the thermoplastic resin.

The coating speed depends on the fluidity of the thermoplastic resin when it is melted by heat, the coater method, the coating amount, etc.
0 mm / sec is appropriate, more preferably 10 to 100 mm
/ Second range.

When the electrodeposition coating method is used as the transfer layer forming method, the above-mentioned thermoplastic resin (A) is electrodeposited or adhered onto the surface of the photoreceptor in the form of resin particles (hereinafter simply referred to as electrodeposition). In some cases), a uniform thin film is formed by heating or the like to form a transfer layer. Therefore, it is necessary that the thermoplastic resin particles (hereinafter also referred to as resin particles (AR)) have either a positive charge or a negative charge, and the electro-detection property of the thermoplastic resin particles is low. It is arbitrarily determined by the chargeability of the body.

Particularly, at least two kinds of resins having different glass transition points (preferably the above-mentioned resins having a high glass transition point (A
H) and at least two kinds of the resin (AL) having a low glass transition point) by using resin particles (hereinafter sometimes referred to as resin particles (ARW) in particular) contained in the same particles, thereby improving transferability. Is improved, and the durability of the transfer layer is improved.
The printing durability as a waterless printing plate can be improved.

In the resin (ARW), the resin (AH) / resin (AL) is 10 to 95/90 to 5 (weight ratio), particularly 30.
９０90 / 70〜１０10 (weight ratio). When the abundance of resin (AH) is 10% by weight or more, when offset printing is performed as a waterless printing plate, sufficient strength against ink tackiness, mechanical force of the impression cylinder, etc. is maintained and a large number of sheets are printed. It is possible to obtain a printed matter that does not stain the non-image portion or lose the image. When the content ratio of the tree finger (AL) is 5% by weight or more, the transferability of the transfer layer is more favorably exhibited.

Further, at least two kinds of resin finger (AH) and resin (AL) contained in the resin particles (ARW) are in a state of being arbitrarily mixed in the particles or a resin finger (AH) main portion and the resin. (AL) may be in a state in which it forms a separate layer structure with the main part (that is, particles having a core-shell structure). In the case of a core-shell structure, the core part is the resin (AH ) Or resin (AL) is not particularly limited.

The resin particles (AR) are in a range satisfying the above-mentioned physical properties, and the average particle diameter thereof is usually 0.01.
μm to 10 μm, preferably 0.05 μm
To 5 μm, more preferably 0.1 μm to 1 μm. The particles are resin particles dispersed in a non-aqueous system (wet type) or resin particles dispersed in an electrically insulating organic substance which is solid at normal temperature and becomes liquid by heating (pseudo wet type).
Either state may be acceptable. Preferred are non-aqueous dispersed resin particles, which can easily adjust the film thickness of the peeling transfer layer to a thin film with a uniform thickness.

The fine resin particles can be produced by a conventionally known mechanical grinding method or polymerization granulation method.
For example, in combination with a dispersing polymer, a wet dispersing machine (for example, ball mill, paint shaker, Keddy mill,
And a method of dispersing by dispersing in a kneaded product by previously kneading a material serving as a resin particle component and a dispersion assisting polymer (or a coating polymer) into a kneaded material, and then coexisting with the dispersing polymer. No. Specifically, a method for producing a paint or a developer for electrostatography can be used. For example, Kenji Ueki, "Flow and paint dispersion of paint", Kyoritsu Shuppan (1971), "Solomon, Science of Paint", "Paint
and Surface Coating Theory and Practice ", Yuji Harazaki" Coating Engineering "Asakura Shoten (1971), Yuji Harasaki" Basic Science of Coating "(1977) and other publications.

As the polymerization granulation method, a dispersion polymerization method can be used for easy production. Specifically, Chapter 2 of “Latest Technologies for Ultrafine Polymers,” Chapter 3, “Development and Practical Use of Recent Electrophotographic Development Systems and Toner Materials,” KEJ Barvett, “Dispersion Polymerization
in Organic Media "and John Wiley (1975).

Further, as described above, when obtaining resin particles (ARW) having a core-shell structure in which at least two kinds of resins having different glass transition points are contained in the same particle, a seed polymerization method is used. It can be easily manufactured. Specifically, first, fine particles are synthesized by a conventionally known non-aqueous dispersion polymerization method described in a compendium on the above-mentioned non-aqueous dispersion polymerization method, and then the seed particles are further prepared as seeds using the fine particles as seeds. It can be produced by a method in which monomers corresponding to resins (A) having different glass transition points are fed and polymerized.

In the above-mentioned polymerization granulation method, in order to introduce the polymer component (F) into the resin (A) for improving the releasability, it is soluble in an organic solvent which becomes a thermoplastic resin and is polymerized. The resin (A) is obtained by carrying out a polymerization reaction in the presence of a monomer corresponding to the polymer component (F) together with the insoluble monomer.
Random copolymer resin particles (AR) copolymerized in
Can be easily obtained. Also, when introducing a reactive group capable of chemically bonding at the interface with the non-adhesive resin layer, the reactive group-containing monomer is allowed to coexist in the same manner as above to carry out a polymerization reaction, and then to react with the resin (A). Polymerize it.

Further, in order to introduce the polymer component (F) in a polymer block, a method of using at least a block copolymer containing the polymer component (F) in a block in the dispersion stabilizing resin to be used, or Weight average molecular weight of 1 × 10 ³ to 2 containing the polymer component (F) as a main repeating unit
A block copolymer can be easily prepared by co-existing with a monomer in the presence of × 10 ⁴ (preferably 3 × 10 ^{3 to} 1.5 × 10 ⁴ ) monofunctional macromonomer. Further, as another method, a polymer initiator containing the polymer component (F) as a main repeating unit (azobis polymer initiator or peroxide polymer initiator) is also used. Coalescent resin particles can be obtained.

The non-aqueous solvent used in the production of the non-aqueous solvent-based dispersed resin particles may be any organic solvent having a boiling point of 200 ° C. or lower, and may be used alone or in admixture of two or more. . Specific examples of such organic solvents include alcohols such as methanol, ethanol, propanol, butanol, fluorinated alcohol and benzyl alcohol, ketones such as acetone, methyl ethyl ketone, cyclohexanone and diethyl ketone, ethers such as diethyl ether, tetrahydrofuran and dioxane. ,
Methyl acetate, ethyl acetate, butyl acetate, carboxylic esters such as methyl propionate, hexane, octane,
Decane, dodecane, tridecane, cyclohexane, cyclooctane and other aliphatic hydrocarbons having 6 to 14 carbon atoms, benzene, toluene, xylene, chlorobenzene and other aromatic hydrocarbons, methylene chloride, dichloroethane, tetrachloroethane, chloroform, methyl Examples thereof include halogenated hydrocarbons such as chloroform, dichloropropane and trichloroethane. However, the present invention is not limited to the compound examples described above.

By synthesizing the dispersed resin particles in these non-aqueous solvent systems by the dispersion polymerization method, the average particle diameter of the resin particles easily becomes 1 μm or less, and the particle diameter distribution is very narrow and monodisperse. It can be a particle.

Since these non-aqueous dispersion resin particles are subjected to a wet electrostatic photography development method or a method in which they are electrophoresed in a pressure field of an electric field, they are electro-deposited. It is preferable to adjust to a non-aqueous solvent system having a resistance of 10 ⁸ Ω · cm or more and a relative dielectric constant of 3.5 or less.
Particles mainly containing a thermoplastic resin have an electric resistance of 10 ⁸
The method of supplying by dispersing in an electrically insulating solvent having an Ω · cm or more and a relative dielectric constant of 3.5 or less is preferable in that the film thickness of the transfer layer can be uniformly and thinly adjusted.

As the insulating solvent, specifically, linear or branched aliphatic hydrocarbons, alicyclic hydrocarbons or aromatic hydrocarbons, and halogen-substituted products thereof can be used. For example, octane, isooctane, decane, isodecane, decalin, nonane, dodecane, isododecane, cyclohexane, cyclooctane, cyclodecane, benzene, toluene, xylene, mesitylene, isoper E, isoper G, isoper H, isoper L
(Isoper; trade name of Exxon), Shersol 7
0, Shelsol 71 (Shelsol; trade name of Shell Oil), Amsco OMS, Amsco 460 solvent (Amsco; trade name of American Mineral Spirits) or the like can be used alone or in combination.

Here, it is preferable to use the insulating organic solvent from the beginning as the non-aqueous solvent used in the polymerization granulation of the non-aqueous dispersion resin particles, but after granulating with a solvent other than these solvents, the dispersion medium It can also be prepared by substitution.

As another method for synthesizing the non-aqueous latex, a polymer component soluble in a non-aqueous solvent having an electric resistance of 10 ⁸ Ωcm or more and a dielectric constant of 3.5 or less as described above and insoluble in the solvent. A block copolymer composed of a polymer component may be wet-dispersed in the solvent to be provided as fine resin particles. That is, a block copolymer consisting of a soluble polymer component and an insoluble polymer component,
In this method, a polymer is prepared in advance in an organic solvent in which the block copolymer is dissolved by using the above-described block polymer synthesis method, and then dispersed in a non-aqueous solvent for electrodeposition.

As described above, in order to electrophoretically disperse the dispersed particles in the dispersion medium, the resin particles (AR) are positively-charged or negatively-charged detectable particles, and the resin particles (AR) are detected. The technology of imparting electrical conductivity can be achieved by appropriately utilizing the technology of the developer for wet electrostatic photography. Specifically, the aforementioned "Recent development and practical use of electrophotographic development systems and toner materials", pages 139 to 148, and "Basics and Application of Electrophotographic Technology", edited by the Society of Electrophotography, 497-505 (Corona Co., 1988) Annual publication), Yuji Harasaki "Electrophotography" 16 (No. 2), p. 44 (1977), etc., using the electrolysis material and other additives. For example, British Patent No. 893,429
No. 934,038, U.S. Pat. No. 1,122,39.
No. 7, 3,900, 412, 4, 606, 989
No., JP-A-60-179751, JP-A-60-18596
No. 3, JP-A-2-13965 and the like.

The composition of the non-aqueous resin particle dispersion (latex) to be subjected to electrodeposition is usually 0.1 to 30 g of particles mainly containing a thermoplastic resin in at least 1 liter of an electrically insulating dispersion medium. , Dispersion stabilizing resin is 0.0
1 to 100 g, and the charge control agent to be added as needed is 0.1 g.
The range is from 0001 to 10 g.

Further, other additives may be added in order to maintain dispersion stability of particles, charge stability, and the like.
Examples thereof include rosin, petroleum resin, higher alcohols, polyethers, silicone oils, paraffin waxes, and triazine derivatives. However, it is not limited to these. The upper limit of the total amount of these additives is regulated by the electrical resistance of the latex for electrodeposition. That is, when the electric resistance is lower than 10 ⁸ Ωcm, it becomes difficult to obtain a sufficient amount of the thermoplastic resin particles, and the amount of each additive is controlled within this limit.

The thermoplastic resin particles which have been microparticulated and imparted with an electric charge and dispersed in the electrically insulating liquid in this manner behave like an electrophotographic wet developer. Therefore, for example, it is possible to perform electrophoresis on the surface of the photoconductor by using the developing device, for example, the slit developing electrode device described in "Basics and Applications of Electrophotographic Technology" on pages 275 to 285. That is, particles mainly containing the thermoplastic resin (A) are supplied between the opposing electrodes provided so as to face the photoreceptor, and adhere to or adhere to the photoreceptor by electrophoresis according to a potential gradient applied from an external power supply. The film is formed by electrodeposition.

Generally, when the particles are positively charged, a voltage is applied between the conductive support of the photoconductor and the developing electrode of the developing device from an external power source so that the photoconductor has a negative potential. Then, the particles are electrostatically electrodeposited on the surface of the photoreceptor. Electrodeposition can also be performed by wet toner development using a normal electrophotographic process. That is, as shown in the prerequisite "Basics and Application of Electrophotography", pp. 46-79, the photosensitive member is uniformly charged and then the usual wet toner development is performed.

On the other hand, a preferable medium used when resin particles dispersed in a medium which is liquefied by heating is solid at room temperature and has a heating temperature of 30 to 80 ° C., preferably 4
It is an electrically insulating organic compound which becomes a liquid at 0 to 70 ° C, and suitable compounds therefor have a freezing point of 30 to 80 ° C.
Paraffins, waxes, low molecular weight polypropylene having a freezing point of 20 to 80 ° C, tallow having a freezing point of 20 to 50 ° C, and hardened oil having a freezing point of 30 to 80 ° C. These can be used alone or in combination.

Other necessary characteristics are the same as those of the electrodeposition resin particle dispersion used in the above-mentioned wet development method.

Further, the resin particles used in this pseudo-wet method are so-called cores in which the resin component having a high glass transition point or a high softening point which does not soften at the liquefying temperature of the medium used constitutes the outer shell of the particles. -By using shell-type particles (a resin having a low Tg in the core portion and a resin having a high Tg in the shell portion), the dispersed resin particles are not fused by heating and are maintained in a stable dispersed state. Is possible.

The amount of the thermoplastic resin particles deposited on the photoconductor can be arbitrarily adjusted by the applied voltage of the external bias, the charging potential of the photoconductor, the electrodeposition time and the like. After electrodeposition, the developer is wiped off by a squeeze using a known rubber roller, gap roller, reverse roller or the like. Methods such as corona quiz and air squeeze are also known. In addition, cold or warm air,
Alternatively, it is dried by an infrared lamp or the like, and the thermoplastic resin particles are formed into a film to form a transfer layer.

The electrodeposition coating method is particularly preferable because the transfer device can be simplified and a uniform thin film can be formed stably and easily.

Next, the formation of the transfer layer by the transfer method will be described. The transfer method is to transfer a transfer layer formed on a peelable support represented by release paper to the surface of a photoreceptor.

The release paper on which the transfer layer is formed is usually in the form of a roll or a sheet and can be easily supplied to an electrophotographic plate making apparatus. As the release paper, any conventionally known release papers can be used. For example, a new adhesive (adhesive) technology and its use / development materials of various applied products (publishing;
May 20, 2013), Product Encyclopedia of All Paper Guide Papers, Volume 1, Cultural Industry Edition (Published by Paper Industry Times, Inc.
Those described in the books such as December 1, 1983) can be mentioned. Specifically, the release paper is an unbleached Clupak paper laminated with a polyethylene-based release agent, a polyethylene resin, high-grade paper or kraft paper precoated with a solvent-resistant resin, and an undercoated PET film. Or coated on glassine paper. A silicone of a solvent type is generally used, and the silicone is applied and dried at a concentration of 3 to 7% on a substrate with a gravure roll, a reverse roll, a wire bar or the like, and then heat-treated at 150 ° C. or higher to be cured. The coating amount is about 1 g / m ² .

As the release paper, tapes, labels, forming industry and cast coat industry, which are generally commercially available from paper makers, can be used. For example, Separay paper (manufactured by Oji Paper Co., Ltd.), King Lees (manufactured by Shikoku Paper Co., Ltd.), Sun Release (Sanyo Kokusaku Pulp Co., Ltd.)
And NK High Release (manufactured by Nippon Kaishi Paper Co., Ltd.).

In order to form the transfer layer on the release paper, the transfer layer composition containing the thermoplastic resin (A) as the main component is applied and formed by a bar coating method, a spin coating method, a spray coating method or the like according to a conventional method. This can be done easily. Further, the hot melt coating method or the electrodeposition coating method may be used.

In order to thermally transfer the transfer layer on the release paper onto the photoreceptor, a usual thermal transfer method can be used. That is, the release paper holding the transfer layer may be pressed against the photoreceptor on which the toner image has been formed, and the transfer layer may be thermally transferred. For this purpose, for example, an apparatus as shown in FIG. 6 is used. The conditions for transferring the transfer layer from the release paper to the photoreceptor surface are preferably as follows. Roller nip pressure is preferably 0.1-10 kg
f / cm ² , more preferably 0.2 to 8 kgf / cm ² , and the temperature at the time of transfer is preferably 25 ° C to 100 ° C, more preferably 40 ° C to 80 ° C. The transport speed is preferably 0.5 to 200 mm / sec, more preferably 10 to 150 mm
/ Sec. A non-fixed toner image is formed on the electrophotographic photosensitive member provided with the transfer layer by a normal electrophotographic process using a liquid developer.

In the present invention, the non-fixed toner image means
A toner image in which the adhesive force to the non-adhesive resin layer is set to be smaller than the adhesive force to the transfer layer of the non-adhesive resin layer. Preferably, the toner image has an adhesive force with the non-adhesive resin layer of 20 g · f or less, particularly 5 g · f or less, as the adhesive force.

The method of forming a non-fixed toner image can be easily achieved by using a conventionally known developer and omitting the process of fixing by heat. Further, by improving the toner image forming material, it is possible to satisfy the above physical properties. It is particularly advantageous when a certain amount of heat is conducted from the viewpoint of the electrophotographic process or the subsequent process of forming the non-adhesive resin layer. Specifically, the following methods (1) to (5) are mentioned.

The glass transition point of the resin constituting the toner particles is selected to be at least 40 ° C. or higher, preferably 80 ° C. or higher. Cured resin particles having an internal crosslinked structure are used as toner particles (for example, see JP-A-5-34998 and JP-A-5-15).
0562 and the like). The proportion of the pigment in the colored toner particles comprising the pigment and the binder resin is 50% by weight or more, preferably 80% by weight.
This is the case (particles of only pigment may be used). As long as the above conditions are satisfied, the toner image formation by the electrophotographic process may be any conventionally known method, and is not limited.

As the developer used in the present invention, a conventionally known liquid developer for electrophotography can be used. For example,
"Basics and Applications of Electrophotography" 497-505
Page, supervised by Koichi Nakamura, "Development and Practical Use of Toner Materials", Chapters 3 and 4 (Nippon Kagaku Joho, 1985), Moto Machida, "Recording Materials and Photosensitive Resins", pp. 107-127 (1983) ), Society of Publishing, Inc., Electrophotographic Society, "Imaging No. 2-5, Electrophotographic Development / Fixing / Charging / Transfer", Electrophotographic Society, "Imaging No.1, Electrophotographic Development", 34-42. Page, Electrographic Society of Japan (1977), Soft Giken Publishing Division, “Electrophotographic Process Technology”, 397-4
Specific examples are shown on page 08, Management Development Center (published in 1989), Yuji Harasaki "Electrophotography" 16 (No. 2), page 44 (1977).

The basic constitution of the concrete liquid developer is an electrically insulating organic solvent (for example, isoparaffin aliphatic hydrocarbon: Isopar H, Isopar G (manufactured by Esso), Shellsol 70, Shellsol 71 (manufactured by Shell). ), LP
-Solvent 1620 (manufactured by Idemitsu Petrochemical) or the like as a dispersion medium, and using an inorganic or organic pigment or dye as a colorant in combination with a resin for imparting dispersion stability and chargeability as necessary. Thus, various additives are added as required to enhance the charge characteristics or improve the image characteristics.

Known dyes and pigments can be arbitrarily selected as the colorant, and examples thereof include benzidine type, azo type (including metal-containing), azomethine type, xanthene type, anthraquinone type, triphenylmethane type and phthalocyanine. Examples thereof include titanium (including metal-containing), titanium white, zinc white, nigrosine, aniline black, carbon black and the like.

As the resin, a resin insoluble in the above-mentioned solvent,
Examples of the resin include a resin soluble in the solvent that stabilizes the dye / pigment or the insoluble resin, but polymers in which the insoluble resin component and the soluble resin component are bonded in the same polymer chain are also used. These resins are not particularly limited, and are arbitrarily selected from conventionally known resins. For example, various resins described as the binder resin for the photoconductor can be used.

The size of the colored particles or dispersed resin particles dispersed in these dispersion media is preferably 0.05 to 5 μm, more preferably 0.1 to 3 μm in terms of the average particle size.

The particles are electrophoretic particles of positively charged or negatively charged in order to electrophorese the dispersed particles in the dispersion medium, and further other additives may be added to impart or adjust the electroscopicity. Is also added. For example, a metal salt of an alkyl sulfosuccinic acid, a metal salt of a naphthenic acid, a metal salt of a higher fatty acid, a metal salt of an alkyl benzene sulfonic acid, a metal salt of an alkyl phosphate, a copolymer containing a lecithin, poly (vinylpyrrolidone), a hemimaleamide component, Malon indene resin, petronate metal salt, abietic acid-modified maleic resin and the like can be mentioned.

Further, for example, British Patent 893,429.
No. 934,038, U.S. Pat. No. 1,122,397
No. 3,900,412, 4,606,989
No., JP-A-60-179751, JP-A-60-18596
No. 3, JP-A-2-13965, JP-A-60-6176
No. 5, etc. may be used.

Further, other additives may be added for the purpose of maintaining dispersion stability of particles, maintaining charge stability, improving transferability, and the like. For example, rosin, petroleum resin, higher alcohols, polyethers, Polyethylene glycols, polypropylene glycols, silicone oils, paraffin waxes, triazine derivatives, fluororesins, organic base-containing acrylate resins described in JP-A-59-95543 and 59-160152, and the like can be used. Can be mentioned.

The upper limit of the total amount of these additives is restricted by the electric resistance of the liquid developer. That is, when the electric resistance is lower than 10 ⁸ Ω · cm, it becomes difficult to obtain a sufficient amount of toner particles attached, and therefore the amount of each additive added is controlled within this limit.

The amounts of the main components of the liquid developer are usually as follows. The amount of the toner particles containing a resin (and a colorant used as desired) as a main component is preferably 0.5 parts by weight to 50 parts by weight with respect to 1000 parts by weight of the carrier liquid. If the amount is less than 0.5 parts by weight, the image density becomes insufficient, and if it exceeds 50 parts by weight, fogging to a non-image portion is apt to occur. The carrier liquid-soluble resin for dispersion stabilization is also used as needed, and 0.5 parts by weight to 1000 parts by weight of the carrier liquid is used.
About 100 parts by weight can be added. The charge control agent is preferably used in an amount of 0.001 to 1.0 part by weight based on 1,000 parts by weight of the carrier liquid. If desired, various additives may be added. The upper limit of the total amount of these additives is regulated by the electric resistance of the liquid agent. That is, the electric resistance of the liquid developer from which the toner particles have been removed is 10 ⁹ Ωcm.
When the value is lower, it is difficult to obtain a high quality continuous tone image. Therefore, the amount of each additive is controlled within this limit.

Specific examples of the method for producing a liquid developer include:
A method of producing colored particles by mechanically dispersing a colorant and a resin using a disperser such as a sand mill, a ball mill, a jet mill, and an attritor is disclosed in, for example, Japanese Patent Publication No. 35-55.
No. 11, 35-13424, and 50-40017
No. 49-98634, No. 58-129438,
It is described in JP-A-61-180248.

Further, there is a method in which dispersed resin particles are produced by a conventionally known non-aqueous dispersion polymerization method, and a pigment is separately mixed with a dispersant and wet-dispersed colored particles. Specific examples using the dispersed resin particles by the non-aqueous dispersion polymerization method are described in, for example, U.S. Pat. No. 3,990,980, JP-B-4-31109, and JP-A-6-40229. As another method for producing the colored particles, a method for further coloring the dispersed resin particles may be mentioned.

As one of the coloring methods, JP-A-57-4 is used.
As described in No. 8738 and the like, there is a method of dyeing a dispersion resin with a preferable dye. Also, JP-A-53-5
No. 4029, a method of chemically bonding a dispersing resin and a dye, and a method of preliminarily containing a pigment in the production by polymerization granulation as described in JP-B No. 44-22955. There is a method of using a monomer to obtain a dye-containing copolymer.

The thickness of the unfixed toner image is at least 0.5.
μm, and preferably about 2 to 3 μm. Within this range, the removal of the non-adhesive resin layer in the toner image area is facilitated, and it is advantageous without consuming more toner than necessary.

In the present invention, the toner image formed in a non-fixed state on the electrophotographic photosensitive member is lumped together with the transfer layer on the lithographic printing plate support through the primary receptor (intermediate transfer medium). It is transferred by contact transfer. 1
The secondary receptor receives the toner image formed on the photoconductor together with the transfer layer by contact transfer under heating and / or pressure conditions, and further receives the toner image on the lithographic printing plate support under heating and / or pressure conditions. It is peeled off and transferred.

It is important that the releasability of the surface of the primary receptor is lower than that of the surface of the photoconductor and that the releasability of peeling and transferring to the support for lithographic printing plate is maintained, and it is larger than the surface adhesive force of the photoconductor. , Preferably 10 g · f or more, more preferably 30 g · f or more. Also,
The surface adhesion of the primary receptor is preferably 20-200.
g · f, and more preferably 30 to 180 g · f. The method described for the peelable photoreceptor can be applied to adjust the surface adhesion. The average surface roughness of the primary receptor is preferably 0.01 μm or less. 1 that meets the above conditions
Any secondary receptor may be used, and examples of the method used for transferring the toner image from the photoreceptor to the primary receptor include a drum method and an endless belt method that can be used repeatedly.

The material for the primary receptor in the drum system may be any as long as it satisfies the above conditions.
The elastic layer or the laminated structure including the elastic layer and the reinforcing layer is preferable, and the surface of the laminated structure may satisfy the above physical properties. These stacks may be provided directly on the drum or may be removable so that they can be replaced.

Examples of the elastic body include conventionally known natural resins and synthetic resins. These can be used alone or in combination of two or more to form a single layer or a plurality of layers. For example, AD Roberts "Natural Rubber Science
and Technology ”Oxford Science Publications (1988
Annual), W. Hofmann "Rubber Technology Handbook",
Various resins described in Hanser Publishers (published in 1989), plastic material structure, 18 volumes, Nikkan Kogyo Shimbun, etc. are used.

Specifically, styrene-butadiene rubber,
Butadiene rubber, acrylonitrile-butadiene rubber,
Cyclized rubber, chloroprene rubber, ethylene-propylene rubber, butyl rubber, chlorosulfonated polyethylene rubber,
Silicone rubber, fluorine rubber, polysulfide rubber, natural rubber,
Examples include isoprene rubber and urethane rubber, but are not limited thereto, and may be arbitrarily selected in consideration of the releasability from the transfer layer, durability, and the like. The thickness of the surface elastic layer is preferably from 0.01 mm to 10 mm.

As the reinforcing layer for the elastic layer, cloth, glass fiber, resin-impregnated special paper, aluminum, stainless steel or the like is used. A sponge-like rubber layer may be provided between the surface elastic layer and the reinforcing layer.

Also in the endless belt system, known members for the primary receptor can be used. For example, US Pat. Nos. 3,893,761, 4,684,238 and 4,690,539 can be used. The ones mentioned are mentioned. In the layer of the belt carrier of the belt type primary receptor,
For example, a method in which a layer serving as a heating medium is provided as described in JP-T-4-503265 may be used. In the pressure contact transfer under heating, the pressure applied to the toner image layer is relaxed by the elastic layer (cushion effect), so that distortion such as distortion or deformation does not occur in the high-definition toner image portion, It enables faithful transfer.

Known methods and apparatuses can be used for this contact transfer. The nip pressure during transfer is 0.1
10 to 10 kgf / cm ² , more preferably 0.2 to 5 kgf / c
m ² and a spring or a pneumatic cylinder using compressed air at both ends of the roller shaft can be used as the roller pressing means. Transport speed is 10 to 300 mm
/ Sec, more preferably 50 to 200 mm / sec. As the heating temperature at the time of transfer, the temperature on the surface of the photoreceptor is 30 ° C to 8 ° C.
The temperature is 0 ° C, more preferably 35 ° C to 60 ° C, and the surface temperature of the primary receptor is 40 ° C to 100 ° C, more preferably 45 ° C to 70 ° C.

Next, in the present invention, the toner image on the primary receptor is transferred together with the transfer layer to the lithographic printing plate support by contact heat transfer. Also in this thermal transfer, known methods and devices can be used. The nip pressure between the primary receptor and the backup roller of the lithographic printing plate support during transfer and the transport speed are substantially the same as the conditions in the transfer process from the photoreceptor to the primary receptor. Further, the temperature of the primary receptor is preferably equal to the temperature at the time of the first transfer, and the transport speed is also the same, so that the continuous process of the first transfer and the second transfer becomes possible, and the time is further shortened. To be done.

The surface temperatures of the transfer backup roller and the peeling backup roller, which are the backup rollers of the lithographic printing plate support, may be the same or different, and are preferably 50 ° C. to 140 ° C., more preferably 70 ° C.
C. to 120C. Even if the temperature on the backup roller side in the second transfer is set to a high temperature, the heat load on the photoconductor can be reduced by controlling the temperature on the primary receptor.

Transfer from Photoreceptor to Primary Receptor (First
Transfer) and transfer from the primary receptor to the lithographic printing plate support (second transfer) may be performed simultaneously within one screen,
Also, after the transfer of the entire one screen to the primary receptor is completed,
You may transfer to the support for lithographic printing plates.

As the support for lithographic printing plate used in the present invention, the support conventionally used for offset printing plates can be used as it is. Specifically, a plastic sheet, a paper having printing durability, a paper laminated with a plastic sheet or a metal foil, an aluminum plate, a zinc plate, a copper-aluminum plate, a copper-stainless plate, a bimetal plate such as a chrome-copper plate, A substrate such as a chrome-copper-aluminum plate, a chrome-lead-iron plate, or a trimetal plate such as a chrome-copper-stainless plate is used. Its thickness is 0.1 to 3 mm, especially 0.
1-1 mm is preferable.

As described above, after the toner image is transferred onto the lithographic printing plate support through the primary receptor together with the transfer layer, the non-adhesive resin layer is provided on the entire surface thereof. The non-adhesive resin layer used in the present invention means that the adhesive force to the transfer layer (T) is larger than the adhesive force to the toner image (preferably the adhesive force to the transfer layer is 200 g · f or more), and A resin layer that forms an ink-repellent surface that does not cause scumming due to ink adhesion when printed as a blank printing plate and has good abrasion resistance.

Specific means for providing a difference in adhesive force between the image area and the non-image area are as follows. I. The non-adhesive resin layer has a specific configuration. i) The non-adhesive resin layer contains a specific component. ii) The non-adhesive resin layer contains an adhesive resin other than the non-adhesive resin.

Iii) A non-adhesive resin layer is laminated to have an adhesive layer and an ink-repellent layer. II. A transfer layer (T) having good affinity with the non-adhesive resin layer is used. III. The non-adhesive resin layer and the transfer layer on the support are chemically bonded at the interface.

The above means may be used alone or in combination of two or more kinds. These specific means will be described later.

The ink-repellent surface layer of the non-adhesive resin layer may be any as long as the surface energy of the coating film is 30 erg · cm ⁻¹ or less. By adjusting to this range, it is possible to obtain a clear print without fogging in the non-image portion without causing ink adhesion. Coating the surface energy, preferably 28erg · cm ^{- 1} or less, more preferably 25erg · cm ^-1 or less, more preferably 15
It is about 25 erg.cm- ¹ .

As one method of adjusting the coating surface energy of the ink repellent surface of the non-adhesive resin layer to the above range, for example, a non-adhesive resin such as silicone resin or fluorine resin is contained in the layer. It can be mentioned. In the present invention, a resin containing both a fluorine atom and a silicon atom can be used as the non-adhesive resin. The non-adhesive resin of the present invention is preferably a silicone resin.

The fluorine-based resin is a resin mainly containing a polymer component containing a substituent containing a fluorine atom.
This substituent may be incorporated into the polymer main chain of the polymer, or may be contained as a substituent on the side chain of the polymer.

Examples of the substituent containing a fluorine atom include the following monovalent or divalent organic residues. _{-C n (F) 2n + 1} (n is 1 to 22 integer), - CFH <sub>2,
- (CF 2) m CF 2</sub> H (m is 1-17 of integral), - CF ₂
-, -CFH-

These fluorine-atom-containing organic residues may be combined with each other, and in this case, they may be directly bonded or may be combined with each other via another linking group. Specific examples of the linking group include divalent organic residues, and include —O—, —S—, —N (d ¹ ) —, and —CO—.
-, - SO -, - SO 2 -, - COO -, - OCO-,
-CONHCO -, - NHCONH -, - CON (d 1)
A divalent aliphatic group or a divalent aromatic group, which may have a bonding group selected from —, —SO ₂ N (d ¹ ) — and the like,
Or an organic residue composed of a combination of these divalent residues is exemplified. Here, d ¹ represents an alkyl group having 1 to 3 carbon atoms.

The above fluorine atom-containing polymer component is preferably contained in an amount of 80 to 100 parts by weight based on the total polymer components of the resin.

Further, the fluorinated resin may contain a curable functional group, and the content thereof is 1 to 20% by weight. Examples of the contained curable functional group include those described for a silicon-based resin described below. The weight average molecular weight of the fluororesin is preferably 5 × 10 ³ to 1 × 10 ⁶ , more preferably 2 × 10 ^{4 to} 5 × 10 ⁵ .

The silicone type resin is a resin mainly containing a polymer component containing a silicon atom. In the present invention, a polymer mainly composed of a component having a repeating unit of an organosiloxane structure represented by the following general formula (I) can be mentioned as a specific example.

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In the formula (I), R ₁ and R _{2, which} may be the same or different, each represents an aliphatic group, an aromatic group or a heterocyclic group.

R ₁ and R ₂ may be the same as or different from each other and are preferably substituted, and are linear or branched alkyl groups having 1 to 18 carbon atoms (for example, methyl group, ethyl group, propyl group). , Butyl group, hexyl group, heptyl group,
Octyl, nonyl, decyl, dodecyl, tridecyl, tetradecyl, hexadecyl, octadecyl, 2-fluoroethyl, trifluoromethyl, 2-
Chloroethyl group, 2-bromoethyl group, 2-cyanoethyl group, 2-methoxycarbonylethyl group, 2-methoxyethyl group, 3-bromopropyl group, 2-methylcarbonylethyl group, 2,3-dimethoxypropyl group,-(CH
_{2) p C r F 2r +} 1 group (wherein p is an integer of 1 or 2, r is 1 to 1
2 represents an integer) _{group, - (CH 2) p -} (CF 2) s -R '
Group (however, s, alkenyl group having 4 to 18 carbon atoms which may be substituted (for example, 2-methyl-1-propenyl group, 2-
Butenyl group, 2-pentenyl group, 3-methyl-2-pentenyl group, 1-pentenyl group, 1-hexenyl group, 2-
Hexenyl group, 4-methyl-2-hexenyl group, decenyl group, dodecenyl group, tridecenyl group, hexadecenyl group, octadecenyl group, linolel group, etc.), carbon number 7 to 1
2 optionally substituted aralkyl groups (for example, benzyl group, phenethyl group, 3-phenylpropyl group, naphthylmethyl group, 2-naphthylethyl group, chlorobenzyl group,
Bromobenzyl group, methylbenzyl group, ethylbenzyl group, methoxybenzyl group, dimethylbenzyl group, dimethoxybenzyl group, etc.), alicyclic group having 5 to 8 carbon atoms which may be substituted (for example, cyclopentyl group, cyclohexyl group, 2-cyclohexylethyl group, 2-cyclopentylethyl group, polyfluorohexyl group, methylcyclohexyl group, methoxycyclohexyl group, aromatic group having 6 to 12 carbon atoms which may be substituted (for example, phenyl group, naphthyl group, tolyl group , Xylyl group, propylphenyl group, butylphenyl group, octylphenyl group, dodecylphenyl group, methoxyphenyl group, ethoxyphenyl group, butoxyphenyl group, fluorophenyl group, chlorophenyl group, difluorophenyl group, bromophenyl group, cyanophenyl group Group, acetyl Phenyl group, methoxycarbonylphenyl group, ethoxycarbonylphenyl group, butoxycarbonylphenyl group, acetamidophenyl group, propioamidophenyl group, trifluoromethylphenyl group, etc.), or at least one selected from nitrogen atom, oxygen atom, and sulfur atom. A heterocyclic group which may be condensed with a certain atom (for example, as the hetero ring, a pyran ring, a furan ring, a thiophene ring, a morpholine ring, a pyrrole ring, a thiazole ring, an oxazole ring, a pyridine ring, a piperidine ring,
Pyrrolidone ring, benzothiazole ring, benzoxazole ring, quinoline ring, tetrahydrofuran ring, etc.).

Particularly preferably, R ₁ and R ₂ are methyl groups. The dimethylsiloxane unit in which R ₁ and R ₂ are methyl groups is preferably 60% by weight or more, more preferably 7% by weight, based on the total amount of all organosiloxane units in the silicone resin.
5% by weight or more. As a result, the resilience of the printing ink is sufficiently maintained, and the occurrence of background contamination is suppressed.

Further, it is preferable to contain a specific component for improving the adhesiveness between the non-adhesive resin layer in the non-image portion and the transfer layer on the lithographic printing plate support. As such a specific component, a substituent selected from the above-mentioned substituted alkyl group (for example, halogen or cyano substituent), an optionally substituted aralkyl group, an aromatic group, and a heterocyclic group in the silicon-based resin may be R ₁ or R ₂ is included. Furthermore, a carboxyl group in the substituent of R ₁ and / or R ₂ ,
Those containing polar groups such as hydroxyl group, mercapto group, phosphono group, amide group, or ureido group (-N
Examples thereof include those containing a divalent linking group such as HCONH-), thioether group (-S-) and urethane group (-NHCOO-).

The organosiloxane unit containing such a substituent is preferably less than 40% by weight, more preferably 25% by weight, based on the total amount of all the organosiloxane units.
Is less than. A good dimethylsiloxane unit as a printing ink repellent component and the other organosiloxane unit for improving the adhesiveness described above may be present in the above-described ratio. It is possible to improve the performance. Each polymerization unit may be any of a random copolymer, a block copolymer, and a star copolymer, and is not limited.

The weight average molecular weight of the silicone resin is preferably 5 × 10 ³ to 1 × 10 ⁶ , more preferably 2 × 1.
0 ^{4 to} 5 × 10 ⁵ .

The non-adhesive resin layer of the present invention is prepared by the step of selectively removing the non-adhesive resin layer in the toner image area.
It is preferable that the resin layer forms a crosslinked structure and is a curable resin layer. As a result, the mechanical strength of the resin layer film is improved, the non-image area is not damaged during the toner image area removal process, the durability against mechanical external force during printing is maintained, and the printing durability is improved. Is improved.

In the present invention, in order to obtain a cured non-adhesive resin layer, a method of forming a toner image and then providing a resin layer containing a pre-cured non-adhesive resin, and a non-adhesive resin layer are formed. There is a method of curing later. In the above curing method, any conventionally known method can be used for curing the non-adhesive resin layer to form a crosslinked structure inside the layer. Hereinafter, a description will be given using a silicon resin as an example.

For example, there may be mentioned a method of self-crosslinking the silicon-based resin itself, a method of crosslinking the silicon-based resin with various crosslinking agents or curing agents, and a combination of some of these methods. The reaction mode of the bridging reaction between the polymers of the resins may be any conventionally known chemical bonding reaction, or may be a combination of several reaction modes.

Specific examples of these reaction modes include the following reactions i) to iv).

I) Polyvalent metal ions (for example, Ca, Mg, Ba, Al, Zn, F) coexisting with acidic groups (carboxyl group, sulfo group, phosphono group, etc.) contained in the resin.
e, Sn, Zr, cations of polyvalent metals such as Ti), and crosslinking by ionic bond by chelate reaction.

Ii) Organic reactive group [specifically, a hydroxyl group, a thiol group, a halogen atom (for example, a chlorine atom,
Bromine atom, iodine atom), carboxyl group, acid anhydride group, amino group, isocyanate group, protected isocyanate group (blocked isocyanate group), acid halide group, epoxy group, imino group, formyl group, diazo group , A combination of reactive groups selected from azido groups, etc.], and crosslinking by a chemical bond by an addition reaction, a substitution reaction or an elimination reaction.

Iii) Self-coupling groups [eg -CON
HCH ₂ OR 'group (R ₁ ' represents a hydrogen atom or an alkyl group), a group represented by the following (R ₂ 'and R ₃ ' may be the same or different, each represents a hydrogen atom or an alkyl group, or R ₂ ′ and R ₃ ′ may combine to form a 5-6 alicyclic ring), a cinnamoyl group, —Si (R ₄ ′)
_s (OR ₅ ′) _t ｛R ₄ ′ represents an alkyl group, an alkenyl group or an aryl group, and R ₅ ′ represents an alkyl group. s represents 0 or an integer of 1 to 2, and t represents an integer of 1 to 3. Where s + t
= 3 ° etc.].

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Iv) Polymerizable double bond group or triple bond group
Crosslinking by addition polymerization reaction. As a polymerizable double bond group
For example, CH_Two= C (p) COO-, C (CH_Three)
H = CHCOO-, CH_Two= C (CH_TwoCOOH) COO
-, CH_Two= C (p) CONH-, CH_Two= C (p) CO
NHCOO-, CH_Two= C (p) CONHCONH-,
C (CH_Three) H = CHCONH-, CH_Two= CHCO-,
CH_Two= CH (CH_Two)_nOCO- (n is 0 or 1 to 3
Integer), CH_Two= CHO-, CH_Two= CHC₆H _Four-, CH
_Two= CH-S- and the like (p is -H or -CH_Three
Represents). As the polymerizable triple bond group, the same as above
And those having a linking group of

These arbitrarily selected reactive groups can be contained in the silicone resin. Specific examples of the content form include (a) a reactive group directly substituted with one or both of the substituents R _{1 and} R ₂ of the siloxane unit represented by the repeating unit represented by the general formula (I). Do
Or (b) contained in either or both of the substituents R ₁ or R ₂ , (c) contained in a copolymer component of another polymer chain bonded to the polymer chain of the siloxane unit by a block, It may be bonded to the terminal of the polymer chain of the silicone resin (may be bonded via another linking group).

Further, a conventionally known cross-linking reaction peculiar to an organosiloxane polymer is also an effective reaction. For example, “Silicone Handbook” edited by Kunio Ito, Nikkan Kogyo Shimbun (1990)
Annual), edited by Makoto Kumada and Tadashi Wada, "Latest Silicone Technology-
Development and Application- "CMC Co., Ltd., published in 1986). Examples thereof include the following groups (here, R ₁ ″ to R ₅ ″).
Represents an alkyl group).

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The curable reactive group as described above may be contained as a random copolymer in the polymer chain together with the siloxane unit represented by the general formula (I) exhibiting ink resilience, as described above, It may be a block copolymer in which an ink-repellent block and a curable block are combined to form a polymer. Examples of the block copolymer include a graft type, an AB type block (including an ABA type) and a star type.

In the case of these block copolymers, the ink-repellent block component is preferably contained in an amount of 30% by weight or more, more preferably 50% by weight, based on the total amount of the polymer components.
That is all.

As the cross-linking agent or curing agent capable of forming a cross-linking structure with the silicone resin, any of low molecular weight compounds, oligomers and polymers known as conventionally known heat-, light- or moisture-curable compounds can be used. However, they may be used alone or in combination of two or more.

Specific examples of the compounds used as these crosslinking agents or curing agents include "Crosslinking agent handbook" edited by Shinzo Yamashita and Tosuke Kaneko, published by Taiseisha (1981), "Polymer Data Handbook, Basic Edition" edited by The Polymer Society of Japan. ”Baifukan (1986
Tsuyoshi Endo, "Precision of Thermosetting Polymer" (CMC
Ltd., 1986), Yuji Harasaki, "Handbook of Latest Binder Technologies", Chapter II-1 (General Technology Center, 1985), Takayuki Otsu, "Synthesis and Design of Acrylic Resins and Development of New Applications" (published by Chubu Business Development Center) 1985), and the compounds cited in the above-mentioned reviews such as "Silicone Handbook".

For example, an organic silane compound (eg, vinyltrimethoxysilane, vinyltriethoxysilane,
γ-glycidoxypropyltrimethoxysilane, γ-mercaptopropyltriethoxysilane, γ-aminopropyltriethoxysilane, vinyltrichlorosilane, vinyltris (t-butylperoxide) silane, γ-
(Β-aminoethyl) aminopropyltrimethoxysilane, γ-chloropropyltrimethoxysilane, γ-methacryloxypropyltrimethoxysilane, silane coupling agent, etc.), polyisocyanate-based compounds (for example,
Toluylene diisocyanate, diphenylmethane diisocyanate, triphenylmethane triisocyanate,
Polymethylene polyphenyl isocyanate, hexamethylene diisocyanate, isophorone diisocyanate,
High-molecular-weight polyisocyanate, etc.), polyblocked isocyanate-based compound protecting the isocyanate of the above-mentioned polyisocyanate-based compound (examples of compounds used for protecting isocyanate groups include alcohols, β-diketones, β- Ketoesters, amines, etc.), polyol compounds (eg, 1,4-butanediol, polyoxypropylene glycol, polyoxyethylene glycol, 1,1,1-trimethylolpropane, etc.), polyamine compounds (eg, ethylenediamine) , Γ-hydroxypropylated ethylenediamine, phenylenediamine, hexamethylenediamine, N-aminoethylpiperazine, modified aliphatic polyamines, etc.), titanate coupling compounds (eg, tetrabutoxytitanate, tetrapropoxytitanate) Isopropyl tristearoyl titanate), aluminum coupling compounds (eg, aluminum butyrate, aluminum acetyl acetate, aluminum oxide octate, aluminum tris (acetyl acetate), etc.), polyepoxy group-containing compounds, and epoxy resins (eg, edited by Hiroshi Kakiuchi) "New epoxy resin" Shokodo (1985), edited by Kuniyuki Hashimoto, "Epoxy resin" Compounds described in Nikkan Kogyo Shimbun (1969), etc., melamine resin (eg, Ichiro Miwa, Hideo Matsunaga, "Julia")・ Melamine resin ”, compounds described in Nikkan Kogyo Shimbun (1969) and the like, poly (meth) acrylate compounds (for example,“ Oligomer ”Kodansha (1976), edited by Shin Okawara, Takeo Saegusa, Toshinobu Higashimura) Eizo Omori "Functional Acrylic Resin" Techno System (1985
Compounds) described in the annual publication) and the like.

Specific examples of the polymerizable functional groups of the polyfunctional monomer [also referred to as polyfunctional monomer (d)] or the polyfunctional oligomer containing two or more polymerizable functional groups to be coexistent are as follows. Specifically, CH ₂ ═CHCH ₂ —, CH ₂ ═CH
_{COO-, CH 2 = CH-, CH} 2 = C (CH 3) -COO
_{-, CH (CH 3) =} CHCOO-, CH 2 = CHCON
_{H-, CH 2 = C (CH} 3) -CONH-, CH (CH 3)
_{= CHCONH-, CH 2 = CHOCO-,} CH 2 = C
_{(CH 3) -OCO-, CH 2} = CHCH 2 OCO-, CH
_{2 = CHNHCO-, CH 2 = CHCH} 2 NHCO-, C
_{H 2 = CHSO 2 -, CH} 2 = CHCO-, CH 2 = CHO
—, CH ₂ ＣＨCHS— and the like. The same or different ones of these polymerizable functional groups are
Any number of monomers or oligomers may be used.

Specific examples of the monomer having two or more polymerizable functional groups include, for example, a monomer or oligomer having the same polymerizable functional group, a styrene derivative such as divinylbenzene or trivinylbenzene: a polyhydric alcohol. (For example, ethylene glycol, diethylene glycol, triethylene glycol, polyethylene glycol # 20
0, # 400, # 600, 1,3-butylene glycol, neopentyl glycol, dipropylene glycol, polypropylene glycol, trimethylolpropane, trimethylolethane, pentaerythritol, etc., or polyhydroxyphenol (eg, hydroquinone, resorcin, catechol) And their derivatives)
Methacrylic acid, acrylic acid or crotonic acid esters, vinyl ethers or allyl ethers: dibasic acids (eg, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, maleic acid, phthalic acid, itaconic acid, etc.) Vinyl esters, allyl esters, vinyl amides or allyl amides: polyamines (eg, ethylenediamine, 1,3-propylenediamine, 1,4-butylenediamine, etc.) and carboxylic acids containing vinyl groups (eg, methacrylic acid, acrylic Acid, crotonic acid, allyl acetic acid, etc.).

Examples of the monomer or oligomer having different polymerizable functional groups include vinyl group-containing carboxylic acids (for example, methacrylic acid, acrylic acid, methacryloyl acetic acid, acryloyl acetic acid, methacryloyl propionic acid, arylloyl). Propionic acid, itaconiloyl acetic acid, itaconiloyl propionic acid, carboxylic acid anhydride, etc.) and ester or amide derivatives containing vinyl groups such as alcohol or amine reactants (eg vinyl methacrylate, vinyl acrylate, vinyl itaconic acid) , Allyl methacrylate, allyl acrylate, allyl itaconate, methacryloyl vinyl acetate, vinyl methacryloyl propionate, allyl methacryloyl propionate, vinyl oxycarbonyl methyl methacrylate, vinyl acrylate N-allyl acrylamide, N-allyl methacrylamide, N-allyl itaconamide, methacryloyl propionate allyl amide, etc.) or amino alcohols (for example, aminoethanol, 1-aminopropanol, 1- Aminobutanol,
Condensates of 1-aminohexanol, 2-aminobutanol, etc.) with a carboxylic acid having a vinyl group.

In the present invention, a reaction accelerator may be added, if necessary, in order to accelerate the crosslinking reaction of the non-adhesive resin layer. In the case of a reaction mode in which a crosslinking reaction forms a chemical bond between functional groups, for example, organic acids (acetic acid, propionic acid, butyric acid, benzenesulfonic acid, p-toluenesulfonic acid, etc.), phenols (phenol, chlorophenol, Nitrophenol, cyanophenol, bromophenol, naphthol, dichlorophenol, etc.), organometallic compounds (acetylacetonato zirconium salt, acetylacetone zirconium salt, acetylacetocobalt salt, dibutoxytin dilaurate, etc.), dithiocarbamic acid compounds (diethyldithiocarbamate, etc.) ), Thiuram disulfide compounds (such as tetramethylthiuram disulfide), carboxylic anhydrides (phthalic anhydride, maleic anhydride, succinic anhydride, butylsuccinic anhydride, 3,
3 ', 4,4'-tetracarboxylic acid benzophenone dianhydride, trimellitic anhydride, etc.). When the crosslinking reaction is a polymerization reaction mode, a thermal polymerization initiator (a peroxide, an azobis compound, a photopolymerization initiator and a sensitizer (for example, P. Walker, NJ Webers et al., J. Phot.
Sci. 18, 150 (1970), Katsumi Tokumaru, Shin Okawara, "Sensitizers"
This is described in reviews and books such as Kodansha (1987) and specific examples include carbonyl compounds, organic sulfur compounds, azine compounds, azo compounds and the like.

Examples of the silicone resin curing accelerator or reaction control agent include platinum catalysts, methylvinyltetrasiloxane, acetylene alcohols and the like.

As a matter of course, the curing conditions for curing these films are appropriately set according to the characteristics of the materials combined. In order to perform heat curing, for example, 60 ° to 15 °
Treat at 0 ° C. for 5 to 120 minutes. When the above-mentioned reaction accelerator is used in combination, the treatment can be performed under milder conditions.

In order to cure the specific functional group in the resin by irradiation with light, it is sufficient to include a step of irradiation with chemically active light. The chemical actinic rays may be any of visible rays, ultraviolet rays, far ultraviolet rays, electron rays, X rays, γ rays, α rays, etc., but preferably ultraviolet rays, more preferably wavelength 31.
It is a light ray in the range of 0 nm to 500 nm. Generally, a low-pressure, high-pressure or ultra-high-pressure mercury lamp, a halogen lamp, or the like is used. The light irradiation treatment can usually be performed sufficiently by irradiation from a distance of 5 cm to 50 cm for 10 seconds to 10 minutes.

The non-adhesive resin layer used in the present invention contains the above-mentioned non-adhesive resin and other resins within a range not impairing the ink resilience, and is non-adhesive with the surface of the transfer layer on the printing plate support. It is also possible to improve the adhesiveness with the functional resin layer.
As other resins that can be used in combination, various kinds of conventionally known resins can be used as long as they have a softening point of 30 ° C. or higher.

Specifically, olefin polymers and copolymers, vinyl chloride copolymers, vinylidene chloride copolymers, vinyl alkanoate polymers and copolymers, allyl alkanoate polymers and copolymers, styrene and Derivatives, polymers and copolymers, butadiene-styrene copolymers, isobrene-styrene copolymers, butadiene-unsaturated carboxylic acid ester copolymers, acrylonitrile copolymers, methacrylonitrile copolymers, alkyl vinyl ether copolymers Polymers, acrylic acid ester polymers and copolymers, methacrylic acid ester polymers and copolymers, styrene-acrylic acid ester copolymers, styrene-methacrylic acid ester copolymers, itaconic acid diester polymers and copolymers , Maleic anhydride copolymer, acrylamide copolymer, methacrylamide Polymer, polycarbonate resin, ketone resin, polyester resin, amide resin, alkyl-modified nylon resin, hydroxyl group and carboxyl group-modified polyester resin, butyral resin, polyvinyl acetal resin, cyclized rubber-methacrylate copolymer, cellulose acetate resin, urethane Resin, cyclized rubber-acrylate copolymer, copolymer containing a heterocycle containing no nitrogen atom (for example, a heterocycle such as a furan ring, a tetrahydrofuran ring, a thiophene ring, a dioxane ring, a dioxofuran ring, a lactone ring, Benzofuran ring, benzothiophene ring, 1,3-dioxetane ring, etc.), epoxy resin and the like. Among these resins, particularly preferred examples include vinyl alkanoate polymers and copolymers, acrylic resins, methacrylic resins, vinyl chloride resins, cellulose acetate resins, urethane resins, and epoxy resins.

The preferred proportion of these other resins used in the non-adhesive resin layer is less than 40% by weight, and more preferably less than 20% by weight, based on the total resins. Further, these other resins may contain the above-mentioned reactive group which is cured by heat, light or moisture.

As a method of making these other resins compatible with the non-adhesive resin to achieve both ink repulsion and adhesion, for example, "Compatibilization and Evaluation Technology of Polymers" edited by Technical Information Society (1992 published ) Seiichi Nakahama "High-performance polymer alloy"
Those described in books such as edited by The Society of Polymer Science, Maruzen (1991) can be applied.

Further, in a film in which a non-adhesive resin and another resin are mixed, a method may be used in which the property that the non-adhesive resin is concentrated and present on the surface side of the film is used. Furthermore, in order to enhance the interaction between the two resins and improve the cohesive force of the film, as one of the resins, a copolymer containing a polymer component containing silicon and / or fluorine atoms, which is similar to the non-adhesive resin, is block-bonded. A small amount of coalesced can be used.

The non-adhesive resin layer used in the present invention may have a multi-layer structure. For example, a resin layer having good adhesion (adhesion functional layer) is provided on the side of the lithographic printing support which comes into contact with the transfer layer. On top of that, a laminated structure of a non-adhesive resin layer having good ink resilience can be mentioned. The maintenance of the adhesion between the adhesion functional layer and the non-adhesive resin layer having good ink repellency is achieved by the above-mentioned polymer components having good compatibility with the resin for adhesion and the polymer components having good compatibility with the non-adhesive resin. It is possible to make the copolymer in which the above is bonded by a block preferably coexist in the adhesion functional layer.

Further, as described above, the transfer layer (T) on the support has at least a chemical composition at the non-image portion in contact with the non-adhesive resin layer, at the interface below the transfer layer and the non-adhesive resin layer. Adhesion is further improved by curing by reaction.

The method for providing the non-adhesive resin layer on the surface of the transfer layer on the support is not limited to any conventionally known method. Specifically, as long as the resin for the non-adhesive layer is liquid or solvent-soluble, it can be applied by a conventionally known means. For example, Yuji Harazaki “Coating Engineering” Asakura Shoten (1971), Yuji Harasaki “Coating Method” Maki Shoten (1979), Hiroshi Fukada “The Actuality of Hot Melt Bonding”, Polymer Publishing Association (1979) Air doctor coater, blade coater, knife coater, squeeze coater, impregnation coater, reverse roll coater, transfer roll coater, gravure coater, kiss roll coater, spray coater, etc.
Curtain coater, calendar coater, etc., for example, edited by Shin Ohno "Non-impact printing"
Ink jet method, continuous jet type Sweet method, Hertz method, intermittent jet type Winston method, ink-on-demand type pulse jet method, bubble jet method, ink mist according to the principle and means described in CMC (1986). The mist method of a mold etc. is mentioned.

Further, the non-adhesive resin layer held on a releasable support typified by release paper (hereinafter referred to as release paper) is transferred onto the surface of a transfer layer on a printing support carrying a toner image. It can also be provided by a sticking method. In this method, the release paper having the non-adhesive layer formed thereon can be easily supplied to a roll or sheet transfer device.

As the release paper, any conventionally known release paper can be used. For example, "new technology of adhesive (adhesive) and its use / development materials for various applied products" (published by the Management Development Center Publishing Department, May 20, 1978), "All Paper Guide Paper Product Encyclopedia, Volume 1, Culture Industry Edition" (Published by Co., Ltd.)
Paper industry Times, December 1, 1983) and the like are mentioned in the publications.

Concretely, the release paper is coated with a release agent mainly composed of silicone, unbleached Kurupack paper laminated with polyethylene resin, high-grade paper pre-coated with solvent resistant resin, kraft paper or undercoat. The above-mentioned PET film or glassine paper is applied. Silicone is generally used in the form of a solvent, and is used on a substrate.
After being applied and dried at a concentration of ˜7% with a gravure roll, reverse roll, wire bar, etc., it is heat-treated and cured at 150 ° C. or higher. The application amount is about 1 g / m ² .

As the release paper, tapes, labels, forming industry and cast coat industry, which are generally commercially available from paper manufacturers, can be used. For example, Separate Paper (Oji Paper Co., Ltd.), King Leeds (Shikoku Paper Co., Ltd.), Sun Release (Sanyo Kokusaku Pulp Co., Ltd.)
And NK High Release (manufactured by Nippon Kaishi Paper Co., Ltd.).

The non-adhesive resin layer is easily formed on the release paper by applying a film by bar coating, spin coating, spray coating or the like according to a conventional method. In order to thermally transfer the non-adhesive resin layer on the release paper onto the transfer layer on the lithographic printing support, a usual thermal transfer method can be used.
That is, the release paper holding the non-adhesive resin layer may be pressed against a lithographic printing support, and the non-adhesive resin layer may be thermally transferred onto a transfer layer on the support.

The conditions for transferring the non-adhesive resin layer from the release paper onto the transfer layer on the support are preferably as follows. The nip pressure of the roller is 0.1 to 20 kgf / cm ² , more preferably 0.2 to 10 kgf / cm ² , and the temperature at the time of transfer is 25 to 200 ° C., more preferably 40 to 150 ° C.
° C.

As described above, the non-adhesive resin layer is preferably cured so as to withstand the printing pressure at the time of printing, and further, it is chemically bonded to the transfer layer on the support to be sufficiently adhered. It is preferable. Such a film state is achieved by appropriately performing heating and / or light irradiation during each operation in either the coating method or the transfer method. Also,
After the film is placed on the support, heating and / or light irradiation may be performed again. These conditions are preferably performed under the conditions described above.

After the non-adhesive resin layer is provided on the transfer layer of the support carrying the toner image, an operation of selectively removing the non-adhesive resin layer in the toner image area is performed. For selective removal, either a wet system or a dry system may be used, but a dry process is preferred from the viewpoint of easy operation. To remove by wet processing, while swelling the non-adhesive resin layer with a solvent,
There is a method of removing the non-adhesive resin layer in the image area while applying a mechanical force such as rubbing in some cases (for example, JP-A-49-121602).

In the method of the present invention, the non-adhesive resin layer is easily and selectively removed by applying a mechanical external force, and therefore the dry treatment method is not limited. Specific examples include a peel apartment method using an adhesive sheet, a brushing method using a brush, and a friction method using an eraser. Further, when the non-adhesive resin layer provided on the release paper is provided by a transfer method, by adjusting the releasability between the release paper and the non-adhesive resin layer, the non-adhesive resin layer of the toner image portion is adjusted. Can be selectively removed. That is, when the non-adhesive resin layer is pressed against the transfer layer on the support and the release paper is peeled off, the non-adhesive resin layer in the non-image area is transferred to the transfer layer surface of the support, and the other toner image area The non-adhesive resin layer can be removed at the same time by peeling off the non-adhesive resin layer while adhering to the release paper (so-called peel-apart development).

Separation of the transfer layer and the non-adhesive resin layer in the image area is performed either at the interface of the toner image on the transfer layer surface, inside the toner image (by so-called cohesive failure) or at the interface between the toner image and the non-adhesive resin layer. May occur. As a result of the removal of the non-adhesive resin layer in the image area, the toner image may be removed together with the resin layer or may remain on the transfer layer.

The printing plate of the present invention obtained as described above can be printed by various offset printing machines without the use of soaking water, like the conventionally known waterless printing plate.

The method for preparing the electrophotographic waterless planographic printing plate of the present invention will be described below in detail with reference to the accompanying drawings. FIG.
FIG. 1 is a schematic view of an electrophotographic plate making apparatus suitable for carrying out the method of the present invention using a drum system as a primary receptor. First, the transfer layer is provided on the electrophotographic photosensitive member 11 by the transfer layer forming unit 13. Here, the formation of the transfer layer will be described by taking the case of the electrodeposition coating method as an example.

As the transfer layer forming unit 13, an electrodeposition unit containing a resin particle dispersion liquid is brought close to the photoconductor and fixed so that the distance between the electrodeposition unit and the developing electrode is 1 mm. The resin particle dispersion liquid is supplied into this gap and rotated while applying a voltage from the outside so that the resin particles are adsorbed on the entire surface of the photosensitive member. A squeeze device built in the electrodeposition unit is used to remove the dispersion medium adhering to the surface of the photoconductor, and then the resin particles are heat-melted by a heating means to form a film and obtain a transfer layer.

At this time, for exhausting the dispersion medium of the dispersion liquid, the intake / exhaust unit 15 provided for the electrophotographic process of the electrophotographic photosensitive member can be used. The electrodeposition unit is shown in Figure 2.
As shown in FIG. 3, it may be installed side by side in the liquid developing unit set 14, or as a transfer layer forming unit 13 as shown in FIG.

Next, a toner image is formed on the photoconductor by a normal electrophotographic process. First, after the photosensitive member 11 is uniformly charged, for example, positively by a corona charging device 18, image exposure is performed based on image information by an exposure device (for example, a semiconductor laser) 19. , A potential contrast is obtained. A toner image forming unit 14T containing a liquid developer in which resin particles having a positive electrostatic charge are dispersed in an electrically insulating dispersion medium is brought close to the surface of the photoreceptor from the liquid developing unit set 14 and fixed with a gap of 1 mm. .

Further, the photosensitive member 11 is pre-bused by the pre-bus means provided in the developing unit, and then the photosensitive member 11 is connected by a bias power source and electric connection not shown in the figure.
The liquid developer is supplied to the surface of the photoreceptor while applying a developing bias voltage between the photoconductor and the developing electrode. The bias voltage at this time is connected so that the developing electrode side is positive and the photoconductor side is negative, and the applied voltage is slightly lower than the surface potential of the unexposed portion. If the applied voltage is too low, a sufficient toner image density cannot be obtained.

Thereafter, the rinsing means built in the liquid developing unit set 14 is used to wash away the developer adhering to the surface of the photoconductor, and then the squeeze means is used to remove the rinsing liquid adhering to the surface of the photoconductor. Dry by passing under. During this time, the primary receptor 20 is placed away from the surface of the photoconductor 11. As the prebath and the rinsing liquid, a carrier of a usual liquid developer is preferably used.

After the transfer layer is formed, the photosensitive drum is optionally heated by the heating means 16 for thermal transfer, and the primary receptor 20 is also heated by the heating means 16 as required. And the toner image on the photoconductor is transferred to the primary receptor 20 by pressure contact with the transfer layer.

Next, the toner image transferred together with the transfer layer on the primary receptor 20 is further transferred to the lithographic printing plate support 3
Thermal transfer is performed by pressing against 0. The heating means 16 of the primary receptor 20 preliminarily preheats the lithographic printing plate support 30 and the transfer backup roller 31 preliminarily preheats the toner image on the primary receptor 20 to lithographic printing plate support. After being pressed against the body 30, it is cooled by the peeling backup roller 32 and the toner image is transferred together with the transfer layer onto the lithographic printing plate support 30, and a series of steps is completed.

The series of steps from the formation of the transfer layer to the transfer to the primary receptor can be carried out by heating the surface of the photosensitive member in advance. In such a case, the heating temperature of the photosensitive member surface is 7
It is 0 ° C or lower, preferably 60 ° C or lower. At such a temperature, the photoconductor can be used repeatedly without causing damage to the photoconductor. As a result, it is possible to reduce the burden and time required for temperature adjustment in each process.

FIGS. 3 and 4 are schematic views of an electrophotographic plate making apparatus suitable for carrying out the method of the present invention using an endless belt system as a primary receptor. 3 and 4 are essentially the same as the device shown in FIG. 2 except for the primary receptor. Using a device such as that shown in FIG.
When the temperature difference between the first transfer and the second transfer is large, the temperature can be adjusted efficiently.

FIG. 5 is a schematic diagram of an electrophotographic plate-making apparatus suitable for carrying out in a mode that allows flat conveyance as a backup system in the second transfer from the primary receptor. Other than the backup method, there is essentially no difference from the apparatus shown in FIG. As the transfer layer forming unit 13 on the photoconductor, an apparatus of a hot melt coating method or a transfer method can be used instead of the electrodeposition coating method.

In the hot-melt coating method, for example, the thermoplastic resin (A) is applied to the surface of the photoreceptor, for example, the drum peripheral surface, by a hot-melt coater, and is passed under the intake / exhaust unit to be cooled to a predetermined temperature. A transfer layer can be formed. After that, the hot melt coater preferably moves to the standby position.

FIG. 6 schematically shows an example of an apparatus for easily forming a transfer layer on a photoreceptor by using a release paper in the transfer method. The release paper 24 provided with the transfer layer 12 is heated and pressed by the heating roller 25b to transfer the transfer layer 12 to the surface of the photoconductor 11. The release paper 24 is cooled and collected by the cooling roller 25c. If necessary, the photoconductor itself may be heated by the heating means 25a to improve the transferability by thermocompression bonding of the transfer layer.

The transfer layer forming apparatus shown in FIG. 6 transfers the transfer layer 12 onto the photoconductor 11 with the release paper 24, and then the transfer layer forming apparatus shown in FIGS.
It may be used as a transfer device to the lithographic printing plate support 30 in the device shown in FIG. Alternatively, both a device that transfers the transfer layer 12 onto the photoreceptor 11 by the release paper 24 and a device that transfers the transfer layer 12 to the lithographic printing plate support 30 together with the toner image may be incorporated.

[0242]

The present invention will now be illustrated by examples. Synthesis Example 1 of Resin Particles (AR): (AR-1) A mixed solution of 16 g of a dispersion stabilizing resin (Q-1) having the following structure and 550 g of Isopar H was heated to a temperature of 50 ° C. while stirring under a nitrogen stream. To this, 50 g of benzyl methacrylate, 40 g of 2-butoxyethyl methacrylate,
10 g of a monomer (a-1) having the following structure, 2.6 g of methyl 3-mercaptopropionate and 2,2'-azobis (2
-Cyclopropylpropionitrile) (abbreviation ACPP)
1.2 g of the mixed solution was added dropwise over 1 hour. After stirring for 1 hour as it was, 0.8 g of ACPP was added and reacted for 2 hours.
Further, 0.5 g of 2,2'-azobis (isobutyronitrile) (abbreviation: AIBN) was added, and the temperature was set to 80 ° C.
The reaction was performed for 3 hours. After cooling, the white dispersion obtained through a 200-mesh nylon cloth was a monodisperse latex having a conversion of 97% and an average particle size of 0.19 μm. The particle size was measured by CAPA-500 {manufactured by Horiba, Ltd.} (the same applies hereinafter).

A part of the above white dispersion was subjected to a centrifuge (rotation speed 1 × 10 ⁴ rpm, rotation time 1 hour) to collect the precipitated resin particles and dried to obtain a weight average molecular weight of the resin particles ( Mw) (polystyrene conversion value by GPC. The same applies below) and glass transition point (Tg) were measured.
Was 8 × 10 ³ and Tg was 34 ° C.

[0244]

Embedded image

Synthesis Example 2 of Resin Particles (AR): (AR-
2) Macromonomer containing dimethylsiloxane as a repeating unit (Silaplane FM-725, Mw 1.0 × 1)
A mixed solution of 0 ⁴ , 18 g of Chisso Co., Ltd., 100 g of vinyl acetate and 382 g of Isopar G was heated to 75 ° C. while stirring under a nitrogen stream. To this, AIBN-
1.5 g was added and reacted for 3 hours. Next, AIBN 0.8g
Immediately after the addition, the temperature was raised to 80 ° C. for 2 hours, and further A.
0.5 g of IBN was added and reacted for 2 hours. Temperature 10
After unreacted monomers were distilled off at 0 ° C., after cooling, 20
The white dispersion obtained through a 0-mesh nylon cloth was a monodisperse latex having a conversion of 98% and an average particle size of 0.22 μm. The Mw of the resin particles is 9 × 10 ⁴ ,
Tg was 38 ° C. Synthesis Example 3 of Resin Particles (AR): (AR-3) A mixed solution of 12 g of a dispersion stabilizing resin (Q-2) having the following structure, 65 g of vinyl acetate, 30 g of vinyl valerate, 5 g of crotonic acid and 275 g of Isopar H. The mixture was heated to a temperature of 80 ° C while stirring under a nitrogen stream. 1.6 g of 2,2'-azobis (isovaleronitrile) (abbreviated as AIVN) was added and reacted for 1.5 hours, and 0.8 g of AIVN was added for 2 hours.
Further, 0.5 g of AIBN was added and reacted for 4 hours. Then, the temperature was raised to 100 ° C., and the mixture was stirred for 2 hours to distill off unreacted monomers. After cooling, the mixture was passed through a 200-mesh nylon cloth to obtain a white dispersion with a polymerization rate of 93%. It was a monodisperse latex having an average particle size of 0.25 μm. The Mw of the resin particles was 8 × 10 ⁴ , and the Tg was 24 ° C.

[0246]

Embedded image

Synthesis Examples 4 to 9 of Resin Particles (AR): (AR
-4) to (AR-9) A mixed solution of 20 g of the dispersion stabilizing resin (Q-3) having the following structure and 480 g of Isopar G was heated to a temperature of 50 ° C. while stirring under a nitrogen stream. To this, a mixed solution of a predetermined amount of each monomer shown in Table A below, 2.6 g of methyl 3-mercaptopropionate and 1.5 g of AIVN was added for 1 hour.
The reaction was continued for 1 hour. Then
AIVN. After adding 1.0 g and setting the temperature to 70 ° C. and reacting for 2 hours as it was, AIBN 0.8 g was further added and the temperature was immediately set to 80 ° C. to react for 3 hours.

60 g of Isopar H was added to the above reaction product, the residual monomer was distilled off under reduced pressure of a water jet pump at a temperature of 50 ° C., and the mixture was cooled to obtain a white dispersion through a 200 mesh nylon cloth. Each latex obtained had good monodispersity in the range of 0.18 to 0.25 μm in average particle size. The Mw of the resin particles of each latex is 9 ×
It was in the range of 10 ^{3 to} 1.5 × 10 ⁴ . Tg was as shown in Table-A.

[0249]

[Chemical 6]

[0250]

[Table 1]

Synthesis Examples 10-14 of Resin Particles (AR):
(AR-10-14) 8 g of a dispersion stabilizing resin (Q-4) having the following structure, Table-B below
12 g of each macromonomer and isoper H 3
While stirring 92 g of the mixed solution under a nitrogen stream, the temperature was 50 ° C.
Was heated. In addition, phenethyl methacrylate 50
g, ethylene glycol propyl ether methacrylate 38 g, ACPP 3 g and methyl ethyl ketone 15
0 g of the mixed solution was added dropwise over 1 hour, the reaction was allowed to proceed for 1 hour, and 1.0 g of ACPP was further added, followed by a reaction for 2 hours. Then, AIVN. Immediately after adding 1.0 g, the temperature was set to 75 ° C. and the reaction was carried out for 2 hours. 0.8
g was added and reacted for 2 hours. After cooling, a white dispersion was obtained through a 200 mesh nylon cloth. The polymerization rate of each resin particle is 93 to 99%, and the average particle diameter thereof is 0.15 to 0.
The latex had a narrow particle size distribution in the range of 25 μm.
Mw of resin component of each particle is about 1.5 × 10 ⁴ , Tg is 30
Was in the range of ~ 35 ° C.

[0252]

Embedded image

[0253]

[Table 2]

Synthesis Example 15 of resin particles (AR): (AR-
15) As the resin (A), a Tg-25 ° C vinyl acetate / ethylene [46/54 weight ratio] copolymer (Evaflex 45
X, Mitsui DuPont Chemical Co., Ltd., and Tg 38 ° C
Of polyvinyl acetate at a weight ratio of 1/1 and a temperature of 12
The mixture was melt-kneaded at 0 ° C. in a three-roll mill. This kneaded product was roughly crushed by a crusher trio blender, and 5 g of this crushed product, a dispersion stabilizing resin (Sorprene 1205, manufactured by Asahi Kasei Co., Ltd.)
4 g and 51 g of Isopar H were charged into a paint shaker (manufactured by Toyo Seiki Co., Ltd.) using glass beads having a diameter of about 4 mm as a media, and preliminarily dispersed for 20 minutes. This preliminary dispersion was wet-dispersed at 4500 rpm for 6 hours using a Dynomill KDL type (manufactured by Shinmaru Enterprises Co., Ltd.) using glass beads having a diameter of 0.75 to 1 mm as a media. The white dispersion obtained by passing this through a 200-mesh nylon cloth was a latex having an average particle size of 0.4 μm.

Synthesis Example of Resin Particles (ARW) 1: (ARW)
-1) A mixture of 8 g of the dispersion stabilizing resin (Q-1), 70 g of vinyl acetate, 30 g of vinyl propionate and 388 g of Isopar H was heated to a temperature of 80 ° C. while stirring under a nitrogen stream. To this, 1.5 g of AIBN was added as an initiator and reacted for 2 hours, and 0.8 g of AIBN was further added twice every 2 hours to carry out the reaction. After cooling, the white dispersion obtained by passing through a 200-mesh nylon cloth was a latex having a polymerization degree of 93% and an average particle diameter of 0.14 μm and having good monodispersibility. The Mw of the resin particles was 8 × 10 ⁴ , and the Tg was 17 ° C.
The resin particles obtained here are designated as (AR-16).

A mixed solution of the entire amount of the resin particle dispersion (that is, seed particles) and 10 g of the dispersion stabilizing resin (Q-1) was heated to a temperature of 60 ° C. with stirring under a nitrogen stream.
To this, 50 g of benzyl methacrylate, 40 g of 2-butoxyethyl methacrylate, 10 g of monomer (a-1)
g, 2.6 g of methyl 3-mercaptopropionate, AI
VN. A mixture of 1.0 g and 400 g of Isopar G is
The mixture was added dropwise over 2 hours, and the reaction was continued for another 2 hours. Next, 0.8 g of an initiator was added, the temperature was raised to 70 ° C., and the mixture was reacted for 2 hours. Further, 0.6 g of an initiator was added and reacted for 3 hours. After cooling, 20
The white dispersion obtained through a 0-mesh nylon cloth was a latex having a degree of polymerization of 98% and an average particle size of 0.25 μm and having good monodispersibility. Here, the components reacted for lamination of the resin particles are the same as those of the resin particles (AR-1).

Next, whether or not the obtained resin particles were formed as individual particles was examined by observing the state of the particles using a scanning electron microscope (SEM). A film prepared by dispersing resin particles on a PET film was subjected to a heat treatment at 30 ° C. and 60 ° C. for 5 minutes, and then each sample was subjected to JEOL JSL-T330.
Observation was performed at a magnification of 20,000 using a scanning microscope.
In the sample at a temperature of 30 ° C., a particle state was observed.
No particles were observed in the 0 ° C. sample. That is, the particles were melted by heating.

Similarly, resin particles (AR-1) composed of each of the two kinds of resins (copolymers) constituting the above resin particles are used.
6), the resin particles (AR-1) and these two types of particles were 1 /
The resin particles mixed in a weight ratio of 1 were investigated. In the case of the resin particles (AR-16), the particle state was not already observed in the sample at a temperature of 30 ° C., whereas in the case of the resin particles (AR-1), the sample was at a temperature of 30 ° C. Particles disappeared in the sample at ° C. Furthermore,
In the case of mixed particles, when a sample not heated and a sample at a temperature of 30 ° C. were examined, it was confirmed that the particles at a temperature of 30 ° C. were invisible as compared with the sample not heated.

As a result of visual observation of the thermal behavior of the particles as described above, the resin particles (ARW-1) were not a mixture of two kinds of resin particles, but one kind of particles contained two kinds of resins. In this case, it was confirmed that the high Tg resin was the core / shell particles in which the low Tg resin was distributed in the outer layer and the low Tg resin was distributed in the inner layer.

Synthesis Examples 2 to 7 of Resin Particles (ARW): (A
RW-2) to (ARW-7) In Synthesis Example 1 of the resin particles (ARW), the following Table-
Resin particles (ARW-2) to (ARW-7) were produced in the same manner except that each monomer described in C was used. The degree of polymerization of each latex particle obtained was 95 to 99%, and the average particle diameter was in the range of 0.20 to 0.30 μm, and the monodispersibility was good.

[0261]

[Table 3]

Example 1 X-type metal-free phthalocyanine (manufactured by Dainippon Ink and Chemicals, Inc.) 2
g, 14.4 g of the following binder resin (B-1), 3.6 g of the following binder resin (B-2), 0.15 g of the following compound (A), and 80 g of cyclohexanone were mixed with glass beads in a 500 ml glass container. The mixture was dispersed with a paint shaker (manufactured by Toyo Seiki Seisakusho) for 60 minutes, and then the glass beads were separated by filtration to obtain a photosensitive layer dispersion.

[0263]

Embedded image

Next, this dispersion was subjected to a degreasing treatment.
Apply on a 2mm thick aluminum plate with a wire bar,
After drying to the touch, it was heated in a circulating oven at 110 ° C. for 20 seconds. The film thickness of the obtained photosensitive layer was 8 μm. -Formation of releasable surface layer A coating material containing 10 g of the following silicon resin, 1 g of the following crosslinking agent and 0.1 g of platinum for crosslinking catalyst in 100 g of n-hexane was applied using a wire round rod, and the film thickness was After being dried by touch with 1.5 μm, it was heated at 120 ° C. for 10 minutes. The surface adhesion of the obtained surface layer of the photoreceptor is 1 g.
-It was f or less.

[0265]

Embedded image

The photoreceptor having surface releasability thus obtained was mounted on an apparatus as shown in FIG. 2 as an electrophotographic photoreceptor. As a primary receptor, a blanket for offset printing (9600-A, overall thickness 1.6 mm, surface adhesive strength 190 gf, manufactured by Meiji Rubber Co., Ltd.) was attached to a hollow drum having a temperature controller incorporated therein. The attached one was used.

First, a transfer layer (T) was formed on the surface of the photoconductor. The peripheral speed of the photosensitive drum is rotated at 100 mm / sec, and the slit electrodeposition device is used on the surface of the photosensitive member to supply the dispersion (L-1) of the resin (A) for electrodeposition having the following contents, The body side was grounded, and a voltage of +130 V was applied to the electrode side of the slit electrodeposition device to electrodeposit the resin particles. Then, the dispersion was removed by air squeeze to form a film with an infrared line heater to form a transfer layer. Film thickness is 1.5 μm
Met. Dispersion (L-1) of resin (A) Resin particles (AR-3) 20 g (as solid content) Positive charge control agent (CD-1) 0.08 g Octadecyl vinyl ether / semi-maleic acid dodecylamide (1/1 mol) (Ratio) Copolymer was added to 1 liter of Isopar G (manufactured by Esso Corporation) to prepare.

Next, a toner image was formed on the photoreceptor by an electrophotographic process. +4 photoconductor in dark place
Information stored in the hard disk in the system as digital image data after being corona-charged to 80V, read from a document with a color scanner in advance, color-separated, and corrected with some system-specific color reproduction. Based on the above, a semiconductor laser drawing apparatus was used to perform exposure with light having a wavelength of 788 nm so that the exposure amount on the photoconductor was 30 erg / cm ² .

Using the positively chargeable liquid developer (LD-1) produced by the following method, a bias voltage of +400 V was applied to the electrode in a developing device having a developing electrode so that the toner was electrodeposited on the exposed portion. Reverse development was carried out, and then rinsed in a bath of Isopar H alone to remove stains on the non-image area.

Preparation of Liquid Developer (LD-1) -Synthesis of Dispersed Resin Particles Methyl methacrylate 60 g, methyl acrylate 40
g, 20 g of the following dispersed polymer and 680 g of Isopar H
Was heated to 65 ° C. while stirring under a nitrogen stream.

[0271]

Embedded image

To this, 1.0 g of 2,2'-azobisisovaleronitrile (AIVN) was added and reacted for 4 hours.
Add 0.5 g of IVN and react for 2 hours.
0.5 g was added and reacted for 2 hours. Next, the reaction temperature was set to 9
The temperature was raised to 0 ° C., and the mixture was stirred under a reduced pressure of 30 mmHg for 1 hour to remove unreacted monomers. After cooling to room temperature, a white dispersion was obtained through a 200-mesh nylon cloth. The reaction rate of the monomer in the dispersion was 98% by weight, and the average particle size of the resin particles measured by CAPA-500 (manufactured by HORIBA, Ltd.) was 0.25 μm.
m, and the monodispersity was also good. Resin Tg is 11
5 ° C.

Synthesis of colored particles Tetradecyl methacrylate / methacrylic acid (95/5
(Weight ratio) 10 g of the copolymer, 10 g of nigrosine and 30 g of Isopar G were placed in a paint shaker (manufactured by Tokyo Seiki Co., Ltd.) together with glass beads, and dispersed for 4 hours to obtain a fine dispersion of nigrosine.

Manufacture of Liquid Developer 45 g of the above-mentioned toner resin particle dispersion, 25 g of the above-mentioned nigrosine dispersion, 0.6 g of hexadecene / half-maleic acid octadecylamide (1/1 molar ratio) copolymer and branched octadecyl alcohol ( A liquid developer (LD-1) for electrostatic photography was obtained by diluting 10 g of FOC-1800 (manufactured by Nissan Kagaku Co., Ltd.) into 1 liter of Isopar G.
Next, the drum of the photoreceptor 11 whose surface temperature was adjusted to 60 ° C. and the drum of the primary receptor 20 whose surface temperature was adjusted to 90 ° C. were brought into contact with each other, and the nip pressure was 4 kgf / cm ² and the drum peripheral speed was 10 mm / sec. When the toner image was heated and pressed at 1, the entire toner image was transferred onto the primary receptor 20 together with the transfer layer. Continuously, the drum of the primary receptor 20, the backup roller 31 for transfer set to 130 ° C. and 25 ° C.
Between the backup roller 32 for peeling set to
The electrophotographic printing original plate (EL
P-IX, guide for Fuji Photo Film Co., Ltd.,
When the nip pressure was 8 kgf / cm ² and the drum peripheral speed was 10 mm / sec, the toner image was heated and pressed, and the toner image was transferred onto the ELP-IX support together with the transfer layer. The adhesive force between the transfer layer and the surface of the support was 1 kg · f or more, and the adhesiveness was sufficient.

When the transferred image on the obtained support was observed with a 200 × optical microscope, fine lines, fine characters were not disturbed, and there was no blurring, and the reproducibility of halftone dots of 150 lines / inch was good and the solid areas were uniform. It was an excellent image with sufficient properties. The adhesive strength of the toner image portion to the transfer layer was 10 g · f.

Next, a condensation type silicone rubber (KS705F, Shin-Etsu Silicon Co., Ltd.) is formed on the transfer layer having the toner image.
6g, CAT-PS-1 (Shin-Etsu Silicon Co., Ltd.)
240 mg, CAT-PD (Shin-Etsu Silicon Co., Ltd.) 12
0 mg, a mixed solution of 2 g of vinyl acetate / crotonic acid (99/1 molar ratio) copolymer and 34 g of a mixed solvent of heptane / tetrahydrofuran (3/1 weight ratio) was uniformly applied with a wire bar, and heated at 80 ° C. for 2 minutes. Heat drying and cross-linking were performed to form a non-adhesive resin layer made of silicone rubber (hereinafter sometimes referred to as silicone rubber layer). At this time, the thickness of the silicone rubber layer was 2.12 μm. The adhesive force between the transfer layer in the non-image area and the silicone rubber layer was 500 g · f.

Next, using a PS sponge (manufactured by Fuji Photo Film Co., Ltd.), the entire surface of the silicone rubber layer is rubbed uniformly to remove only the silicone rubber layer on the toner image area, thereby removing the non-image. A lithographic printing plate was prepared by leaving the silicone rubber layer in the pattern of the part.

Using this printing plate, a printing machine (TOKO OFFSET
Ink ink (DRI-O-CO) with 810L, Tokyo Airlines Keiki Co., Ltd.
LOR, manufactured by Dainippon Ink and Chemicals, Co., Ltd., printed without supplying dampening water gave a clear image with no missing lines or fine characters, and no scumming on non-image areas. It was possible to obtain 3000 or more good prints.

Same as Example 1 except that 20 g of resin particles (ARW-7) was used in place of 20 g of resin particles (AR-3) in the electrodeposition dispersion liquid for the transfer layer (T). A printing plate was prepared and printed, and the same results as in Example 1 were obtained. Next, the transfer speed in Example 1 was set to 10 mm /
When the speed was increased from 2 seconds to 50 mm / second, the transfer in the transfer layer of Example 1 was somewhat insufficient. On the other hand, core /
10 in the transfer layer using the shell type particles (ARW-7).
Transfer of 0% was performed, and the image on the support was good without any deformation such as distortion.

In the present invention, the resin of the transfer layer and the resin present in the non-adhesive resin layer interact sufficiently at the interface between both layers,
It can be seen that the adhesion is maintained.

Comparative Example 1 In Example 1, the support on which the toner image was transferred was heated at a temperature of 140 ° C. for 3 minutes to fix the toner image portion. At this time, the adhesive force between the toner image portion and the transfer layer is 250 g
f. Subsequently, a silicon rubber layer was formed in the same manner as in Example 1. At this time, the thickness of the silicone rubber layer was 2.15 μm. When the printing was performed after removing the silicone rubber layer in the image area under the same conditions as in Example 1, the image area was not sufficiently inked and only a printed matter with poor image reproducibility was obtained. Scanning electron microscope (JSM
Detailed observation with -T330, manufactured by JEOL Ltd. revealed that the silicon rubber layer on the image area was not sufficiently removed. The silicon rubber layer on the image area was sufficiently removed by making the rubbing conditions with a sponge more severe, but under such conditions, many fine scratches occurred on the silicon rubber layer on the non-image area, and printing stains occurred did.

In Comparative Example 1, the removability of the silicone rubber layer in the image area was not good because the difference in the adhesiveness between the surface of the transfer layer in the non-image area and the surface of the fixed toner image area with respect to the silicone rubber layer was sufficient. It seems that it was not. Therefore, it is difficult to sufficiently remove the silicon rubber layer in the image area without leaving any damage to the silicon rubber layer. Even if it is possible, the condition is very narrow.

On the other hand, in Example 1, the toner in the image area was not fixed at all, and the apparent adhesion to the silicone rubber layer was almost zero. Therefore, only the silicon rubber layer in the image area can be easily removed without damaging the silicon rubber layer in the non-image area at all.

Comparative Example 2 A toner image was formed in the same manner as in Example 1 except that the transfer layer (T) was not provided on the surface of the photoconductor, and contact transfer was performed to the lithographic printing plate support. The obtained toner image on the support was largely missing and could not be used practically as a copied image. In addition, residual toner was recognized on the photoreceptor and the primary receptor, respectively. That is, it was impossible to completely transfer the non-fixable toner image from the photoreceptor without using the transfer layer.

Comparative Example 3 A printing plate was prepared in the same manner as in Example 1, except that the vinyl acetate / crotonic acid copolymer was not used. When an attempt was made to remove the silicone rubber layer in the image area in the same manner as in Example 1, the silicone rubber layer in the non-image area was partially peeled off, and it was impossible to selectively remove only the image area. Was. As described above, in Comparative Example 3, the adhesion at the interface between the transfer layer on the support and the non-adhesive resin layer composed only of silicon polymer was insufficient, and the adhesive strength of the transfer layer to the non-adhesive resin layer was poor. It is considered that the difference in the adhesive force of the toner image portion to the adhesive resin layer was insufficient.

Example 2 4,4'-bis (diethylamino) -2,2'-dimethyltriphenylmethane (5 g) as the organic photoconductive substance, 6 g of the following binder resin (B-3), and the following methine dye (D- 1)
40 mg, 0.2 g of the compound (A) as a chemical sensitizer
30 ml of methylene chloride and 3 of ethylene chloride
It was dissolved in a mixture with 0 ml to obtain a photosensitive layer dispersion liquid.

[0287]

Embedded image

This photosensitive layer dispersion was applied onto a conductive transparent support (having a vapor-deposited film of indium oxide on a polyethylene terephthalate film having a thickness of 100 μm. Surface resistance 10 ³ Ω) using a wire round rod. ,
By heating at a temperature of 70 ° C. for 2 hours, the film was crosslinked to form a photosensitive layer of about 5 μm. UV curable silicone rubber (TFC7700, made by Toshiba Silicon Co., Ltd.) on the surface of this photoconductor
Was applied with a wire bar, and a high pressure mercury lamp (UM102, manufactured by USHIO INC.) Was irradiated from a distance of 5 cm for 30 seconds. The thickness of the surface layer was 0.6 μm. The surface tackiness of the obtained photoreceptor was 1 g · f.

As the primary receptor, 100 g of isoprene rubber, 1 g of the following resin and 0.001 of phthalic anhydride were formed on the roll surface of the blanket 9600-A used in Example 1.
A coating film was formed using 1 g of the mixture and heated at 140 ° C. for 2 hours to form a cured film having a thickness of 2 μm. The surface adhesive strength was 130 g · f.

[0290]

Embedded image

The thus prepared photoconductor and primary selector were mounted in an apparatus as shown in FIG. The surface temperature of the photosensitive member was adjusted to 50 ° C., and the transfer layer (T) was formed on the surface of the photosensitive member by the wet electrodeposition method using the dispersion liquid (L-2) of the following resin (A) in the same manner as in Example 1. ) Was formed. However, a voltage of +150 V was applied to the electrode of the electrodeposition device. Film thickness is 1.6 μm
Met. Resin (A) dispersion liquid (L-2) Resin particles (AR-1) 20 g (as solid content) Positive charge control agent (CD-1) 0.08 g was adjusted with Isopar G so that the total amount became 1 liter. .

With the surface temperature of the photosensitive member kept at 50 ° C., a toner image was formed on the photosensitive member and rinsed in the same manner as in Example 1, and then 4 kgf of the primary receptor whose surface temperature was adjusted to 50 ° C. pressed in / cm ^2, the toner images were transferred together with the transfer layer onto a primary receptor in transfer speed 30 mm / sec. Subsequently, the backup roller for transfer was adjusted to 120 ° C., the backup roller for peeling was adjusted to 25 ° C., and OK Master (manufactured by Nippon Foil Co., Ltd.) was used as a primary receptor and a backup roller as a support for the lithographic printing plate. Nip pressure of 8 kgf / cm ² between them and at the same speed as above
The transfer layer and the toner image were collectively transferred onto the K master.
The adhesive strength between the transfer layer and the support was 800 g · f.

The copied image thus formed on the OK master was visually observed using a 200 × optical microscope. No background staining due to toner was observed in the non-image area. Further, the toner image and the transfer layer are all transferred onto the photoconductor and the primary receptor without being left untransferred.
Fine wire of 0 μm, 3% to 95% of 150 dots / inch dot
The high-definition image area was excellent and faithfully reproduced without causing fatness, loss, or bending.
The adhesive force of the toner image portion to the transfer layer was 8 g · f.
Next, an ultraviolet curable silicone rubber (TFC770, manufactured by Toshiba Silicon Co., Ltd.) was uniformly applied with a wire bar, and a high pressure mercury lamp (UM102, manufactured by Ushio Inc.) was irradiated from a distance of 5 cm for 30 seconds. The thickness of the silicone rubber layer is 2.
It was 2 μm.

Next, by uniformly brushing the entire surface of the silicone rubber layer, only the silicone rubber layer in the image area is removed, leaving the silicone rubber layer in the pattern of the non-image area, and the planographic printing plate is obtained. Created.

Using the printing plate thus obtained, printing was carried out in the same manner as in Example 1. As a result, 10,000 sheets of printed matter having good image-carrying and non-image-area stain properties were obtained. I was able to obtain above.

Example 3 5 g of the following bisazo pigment, 95 g of tetrahydrofuran and a polyester resin (Vylon 200, Toyobo Co., Ltd.)
5 g of the mixture was thoroughly pulverized in a ball mill. The mixture was taken out and stirred with tetrahydrofuran 52
0 g was added. This dispersion was coated on the conductive transparent support used in Example 2 using a wire round rod to form a charge generation layer of about 0.7 μm.

[0297]

Embedded image

A mixed solution of 20 g of the following hydrazone compound, 30 g of polycarbonate resin (Lexan 121, manufactured by GE) and 160 g of tetrahydrofuran was applied on the charge generation layer using a wire round rod and dried at 60 ° C. for 30 seconds. Further heat at 100 ° C for 20 seconds to about 1
A charge transport layer having a thickness of 8 μm was formed to obtain an electrophotographic photoreceptor having a photosensitive layer composed of two layers.

[0299]

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On this photoreceptor, 30 g of room temperature tack-free type silicone adhesive (TSR1520 [A], manufactured by Toshiba Silicon Co.), 300 mg of crosslinking agent (TSR1520 [B], manufactured by Toshiba Silicon Co.) and heptane. After applying 90 g of the mixed solution with a wire bar, 125 in an oven
Heating at 2 ° C. for 2 minutes formed a surface layer having a thickness of 5 μm. The surface tackiness of the obtained photoreceptor was 2 g · f.

The photoconductor obtained as described above and the same primary receptor as in Example 1 were mounted in an apparatus as shown in FIG. The surface temperature of the photoconductor is set to 50 ° C., the peripheral speed of the photoconductor drum is rotated at 100 mm / sec, and a dispersion liquid (L-3) for the following resin (A) is formed on the photoconductor surface using a slit electrodeposition device. ) Was supplied, the photosensitive member side was grounded, and a voltage of +180 V was applied to the electrode side of the slit electrodeposition device to electrodeposit and fix the resin particles. The thickness of the transfer layer was 2 μm. Dispersion liquid (L-3) of resin (A) Resin particles [AR-5] 20 g (as solid content) Positive charge control agent (CD-2) 0.16 g Zirconium naphthenate was added to 1 liter of Isopar G to prepare. .

With the surface temperature of the photosensitive member kept at 50 ° C.,
Charged to 550V, read in advance from a document by a color scanner, and based on information stored in a hard disk in the system as digital image data,
5mW output He-Ne laser (oscillation wavelength 633nm)
Was exposed on the surface of the photoreceptor at an irradiation dose of 25 erg / cm ² . Using the following positively chargeable liquid developer (LD-2), a bias voltage of 50 V was applied to perform positive development, and rinse with Isopar G was performed. Preparation of liquid developer (LD-2) A mixture having the following composition was kneaded with a kneader at 100 ° C for 2 hours to obtain a mixture. After cooling this mixture in a kneader, it was ground in the same kneader. 10 g of this pulverized material and 40 g of Isopar H were dispersed with a paint shaker for 6 hours to obtain a dispersion. This dispersion was diluted with Isopar G so that the solid content of the toner was 6 g per liter, and at the same time, 0.1 g per liter of zirconium naphthenate was added as a charge control agent for imparting a positive charge property. (LD-2) was produced. Mixture for kneading Ethylene / methacrylic acid copolymer 5g (Nucrel N-699, manufactured by Mitsui DuPont) Polyvinyl acetate (Tg 38 ° C) 0.8g Alkali blue pigment 6g Isopar L (manufactured by Exxon) 30g Next, surface temperature 50 4 kg of primary receptor adjusted to ℃
The toner image was transferred onto the primary receptor together with the transfer layer at a transfer speed of 50 mm / sec by pressing at f / cm ² . Subsequently, the transfer backup roller was adjusted so that the surface temperature of the primary receptor was 90 ° C. when it was pressed against the primary receptor, and the peeling backup roller was not adjusted in temperature, and a PET film having a thickness of 150 μm was used as a support. Was passed between the primary receptor and the backup roller at a nip pressure of 7 kgf / cm ^{2 at} the same speed as above to collectively transfer the transfer layer and the toner image onto the PET film.

The copied image thus formed on the PET film was visually observed using a 200 × optical microscope. No background staining of the toner was observed in the non-image area.
In addition, the toner image and the transfer layer are all transferred onto the photoreceptor and the primary receptor without being left untransferred.
The fine line of m and the high definition image area of 3% to 95% of the halftone dot of 150 lines / inch were faithfully reproduced without thickening, missing, or bending, which was excellent. The adhesive force of the toner image portion to the transfer layer was 12 g · f.

A mixed solution of 6 g of addition-type silicone rubber (KS774, manufactured by Shin-Etsu Silicon Co., Ltd.), 180 mg of CAT-PL-4 (manufactured by Shin-Etsu Silicon Co., Ltd.), and 34 g of heptane was transferred with a toner image on a PET film. A layer was uniformly applied onto the layer with a wire bar, followed by heating and drying at 90 ° C. for 2 minutes and crosslinking to form a silicone rubber layer. The thickness of the silicone rubber layer was 2.1 μm.

Adhesion between the transfer layer in the non-image area and the silicone rubber layer formed thereon is sufficient, and the adhesive force is 800 gf
That was all.

Next, the silicone rubber in the image area was removed by brushing to prepare a printing plate. When the toner image portion of the obtained printing plate was visually observed using an optical microscope of 200 magnifications, a fine line of 10 μm or a halftone dot of 3
95% of the image was formed clearly without any omission, which was an extremely high-definition image.

Printing using this printing plate, it is possible to obtain 50,000 or more excellent printed matter which is a high-definition image almost equivalent to the image on the printing plate before printing and has no background stain at all. I was able to. This means that the resin (AR-5) of the transfer layer (T) on the printing plate support in the non-image area is chemically bonded by a chemical reaction at the interface between the addition type silicone rubber layer and the adhesion between the two layers. It is remarkably improved, and as a result, it is remarkably different from the adhesive strength in the image part, so that the removal of fine image parts proceeds easily, the reproducibility of high-definition images is excellent even when actually printed, and the printing durability is also good. It is considered to have improved.

Example 4 An amorphous silicon photoconductor (manufactured by Kyocera Corp.) was used as an electrophotographic photoconductor, and peelability was imparted to the photoconductor in the following manner. That is, the following compound (S-
1) The above-mentioned photoreceptor was immersed in a bath containing a solution of 1.0 g dissolved in 1 liter of Isopar G (manufactured by Esso Corporation), taken out and dried. The surface tackiness of the photoreceptor thus obtained was 250 g · f before the treatment, but was reduced to 3 g · f, indicating good releasability.

[0309]

Embedded image

This photoconductor and the same primary receptor as used in Example 1 were mounted in a device as shown in FIG. The following resin (A) was placed on a photoreceptor whose surface temperature was set to 55 ° C.
A first transfer layer having a film thickness of 1 μm is provided using the dispersion liquid (L-4) of Example 1, and the dispersion liquid (L-5) of the following resin (A) is further provided thereon.
Was used to form a second transfer layer having a film thickness of 1 μm to form a transfer layer having a laminated structure. Dispersion (L-4) of resin (A) Resin particles (AR-7) 20 g (as solid content) Positive charge control agent (CD-1) 0.07 g These were added to 1 liter of Isopar G to prepare. Dispersion liquid (L-5) of resin (A) Resin particles (AR-4) 20 g (as solid content) Positive charge control agent (CD-1) 0.075 g These were added to 1 liter of Isopar G to prepare.

Next, with the surface temperature of the photosensitive member kept at 55 ° C., corona charging to +700 V is performed, and then the original is read by a color scanner, color separation is performed, and some corrections relating to the color reproduction peculiar to the system are added. Based on the information stored in the hard disk in the system as image data, a semiconductor laser was used to expose with light of 780 nm. The potential of the exposed part was +220 V, and that of the unexposed part was +600 V.

Then, after pre-bathing with Isopar G (manufactured by Esso Standard Petroleum) by a pre-bathing device incorporated in the developing unit, the following liquid developer (L
D-3) was supplied from the developing unit to the surface of the photoreceptor. At this time, a developing bias voltage of +500 V was applied to the developing unit to perform reversal development so that the toner was electrodeposited on the exposed portion. Next, rinsing was carried out in a bath of Isobar G alone to remove stains on the non-image area, and dried with a suction / exhaust unit.

Preparation of Liquid Developer (LD-3) Methyl methacrylate / octadecyl methacrylate (95/5 weight ratio) copolymer (Tg10) as a coating resin.
0 ° C.) and carbon black (# 40,
After sufficient mixing at a weight ratio of 1: 1, the mixture was melted and kneaded in a three-roll mill heated to 150 ° C. A mixture composed of 12 g of the kneaded material, 4 g of a styrene / butadiene copolymer (Solprene 1205, manufactured by Asahi Kasei Corporation) and 76 g of Isopar G was dispersed in a dyno mill. The resulting concentrated toner has a solid content of 6 g.
/ Liter and diluted with Isopar G, and sodium dioctylsulfosuccinate was further added at 1 × 10 ⁻⁴ mol / liter to obtain a developer.

Next, the primary level with the surface temperature set at 55 ° C.
4kgf / cm scepter^TwoAt a transfer speed of 50 mm / sec.
Transcribing and then pressure contact with the primary receptor
Was adjusted so that the surface temperature of the primary receptor was 90 ° C.
Backup roller for transfer and peeling without temperature control
As a support for lithographic printing plates between the back roller for printing
SUS-430 plate with a film thickness of 100 μm (Kawasaki Steel Co., Ltd.)
Made) nip pressure 7kgf / cm ^TwoAt the same speed with the support
The transfer layer and the toner image were collectively transferred onto the top. Toner image
The adhesive force between the transfer part and the transfer layer is as small as 10 gf and is in a non-fixed state.
It was state. Next, a small ink jet printer made by EPSON
Appropriate transport system and liquid delivery system for the head part and control part of the linter
UV-curable silicone rubber with built-in coating machine
(UV9300, manufactured by Toshiba Silicon Co., Ltd.) 6 g, UV9
310C (Toshiba Silicon Co., Ltd.) 60 mg and heptane
34g of mixed solution was applied to the whole surface, and high pressure mercury lamp (UM1
02, Ushio Denki Co., Ltd.) illuminated for 7 seconds from a distance of 3 cm
To form a silicone rubber layer having a film thickness of 2.5 μm.

When the silicone rubber layer in the image area was removed and printing was carried out in the same manner as in Example 1, a good printed matter of the same level as in Example 1 was obtained in terms of both the inking of the image area and the stain resistance of the non-image area. I got more than 50,000 copies.

Example 5 A dispersion (L-6) of the following resin (A) was used on the amorphous silicon photoconductor (manufactured by Kyocera Corp .: surface adhesive strength 250 g · f) in Example 4 to give a film thickness. 1 μm first
A transfer layer was formed. Dispersion liquid (L-6) of resin (A) Resin particles (AR-6) 20 g (as solid content) Positive charge control agent (CD-1) 0.08 g Compound (S-2) 1.5 g

[0317]

Embedded image

These were prepared in 1 liter of Isopar G. When the releasability of the transfer layer thus formed was examined, the surface adhesion was 3 g · f, and the entire surface was easily and easily peeled at the interface between the photoreceptor and the transfer layer. On the other hand, in the dispersion liquid (L-6) of the resin (A), the transfer layer formed from the dispersion liquid not using the compound (S-2) did not show peelability at all. After that, a printing plate was prepared and printed in the same manner as in Example 4, and the same results as in Example 4 were obtained.

Example 6 Photoconductive Zinc Oxide (SAZEX-2000, manufactured by Sakai Chemical Industry Co., Ltd.) 10
0 g, the following binder resin (B-4) 2 g, and the following binder resin (B
-5) 20 g, 0.020 of the following methine dye (D-2)
g, 0.25 g of phthalic anhydride and 300 g of toluene were mixed in a homogenizer (manufactured by Nippon Seiki Co., Ltd.) at 1 × 1.
0 was dispersed for 20 min at ⁴ rpm rotation speed. This photosensitive layer-forming dispersion had a dry adhesion amount of 25 g on a support for an electrophotographic printing original plate (ELP-IIX, manufactured by Fuji Photo Film Co., Ltd.).
/ M ² with a wire bar.
After drying for an minute, an electrophotographic photosensitive member was prepared.

[0320]

Embedded image

The following peelable surface layer was provided on the surface of this photoreceptor. 9 g of the following silicone polymer, 4 of the following cross-linking agent
00 mg, catalyst (X92-1114, Shin-Etsu Silicon Co., Ltd.)
Co., Ltd.) and a mixed solution of 40 mg of heptane were uniformly applied with a wire bar, and heated and dried at 90 ° C. for 2 minutes to form a surface layer. The thickness of the surface layer is 1.0 μm
Met. The surface tackiness of the photoreceptor was 1 g · f or less.

[0322]

Embedded image

The above photoreceptor and the same primary receptor as in Example 2 were mounted in an apparatus as shown in FIG. On this photosensitive member, a dispersion liquid (L-7) of the following resin (A) was used.
A voltage of 190 V is applied to electrodeposit resin particles, and the temperature is 60
The film was heated at 1 ° C. for 1 minute to form a film and form a transfer layer. The film thickness was 4 μm. Dispersion (L-7) of resin (A) Resin particles (AR-13) 8 g (as solid content) Resin particles (AR-9) 12 g (as solid content) Positive charge control agent (CD-3) 0.09 g

[0324]

Embedded image

Was prepared by adding 1 liter of Isopar G. Next, the photoreceptor was corona-charged to -600 V and then exposed to light of 833 nm using a semiconductor laser drawing device so that the exposure amount on the photoreceptor was 30 evg / cm ² . Using the liquid developer (LD-1) and setting the bias voltage of the developing unit to 100 V, the image was subjected to positive development and rinsed with Isopar G.

The surface temperature of each of the photoreceptor and the primary receptor was 50 ° C., the primary receptor was pressed at 3.5 kgf / cm ² , and the drum was rotated at a peripheral speed of 40 mm / sec. Transcribed on receptor. Continuously, a paper support on which aluminum metal foil was laminated and water-resistant was used as a support for the lithographic printing plate between a backup backup roller having a surface temperature of 120 ° C. and a primary receptor, and a nip pressure was 8 kgf / cm ² The transfer layer and the toner image were transferred onto the support by passing them at the same speed as above.

When the copied image thus obtained was visually observed using a 200 × optical microscope, no background stain was observed in the non-image area, and high resolution of fine lines and fine characters in the image area. No lack of area was observed. The adhesive strength between the toner image portion and the transfer layer was 12 g · f, and was in a non-fixed state.

Next, an addition type silicone rubber (KS774,
A mixed solution of 6 g of Shin-Etsu Silicone Co., Ltd., 180 mg of CAT-PL-4 (Shin-Etsu Silicone Co., Ltd.) and 34 g of heptane is uniformly applied with a wire bar, and dried by heating at 90 ° C. for 2 minutes and crosslinking. A silicone rubber layer was formed. The thickness of the silicone rubber layer was 2.1 μm. The adhesive strength between the transfer layer and the silicone rubber layer in the non-image area is 800 gf
That was all.

When the silicone rubber layer in the image area was removed and printing was carried out in the same manner as in Example 1, 10,000 or more good prints with a clear image and no stain on the non-image area could be obtained. .

Example 7 In Example 1, a transfer layer was formed by a melt coating method instead of the wet electrodeposition method. An apparatus as shown in FIG. 3 was used. Formation of Transfer Layer The following resin (A-1) and resin (A-
The mixture consisting of 1/1 weight ratio of 2) was applied at a speed of 20 mm / sec by a hot melt coater set at 90 ° C., and cooling air was blown from an intake / exhaust unit to cool the surface of the photoreceptor. The temperature was kept at 60 ° C. The thickness of the transfer layer was 2.0 μm.

[0331]

Embedded image

A printing plate was prepared and printed in exactly the same manner as in Example 1. As a result, the same good results as in Example 1 were obtained.

Example 8 In Example 3, a transfer method from a release paper as shown in FIG. 6 was used instead of the wet electrodeposition method as the method of forming the transfer layer on the photosensitive member. That is, as the release paper 24, a separate paper (manufactured by Oji Paper Co., Ltd.) is used, and a 2.5 μm film composed of 1/2 weight ratio of the following resin (A-3) and resin (A-4) is used. A paper coated with a film thickness is pressed against the photoconductor and transferred under the conditions of a roller pressure of 3 kgf / cm ² , a surface temperature of 60 ° C. and a passing speed of 50 mm / sec, and a film thickness of 2.5 μm on the photoconductor surface. To form a transfer layer. Thereafter, the same operation as in Example 3 was performed to prepare a printing plate, and printing was performed. The printed image and the number of printings showed the same performance as in Example 3.

[0334]

Embedded image

Example 9 X-type metal-free phthalocyanine (manufactured by Dainippon Ink and Chemicals, Inc.) 1
g, 7.5 g of the following binder resin (B-6), 0.15 g of the following compound (B), and 80 g of cyclohexanone were put into a 500 ml glass container together with glass beads.
Disperse with a paint shaker (manufactured by Toyo Seiki Seisakusho) for 60 minutes, and further, 1.5 g of the following binder resin (B-7), 0.03 g of phthalic anhydride and 0.0 of o-chlorophenol.
After adding 02 g and dispersing for 2 minutes, the glass beads were separated by filtration to obtain a photosensitive layer dispersion.

[0336]

Embedded image

Next, this dispersion was degreased to a density of 0.
Apply on a 2mm thick aluminum plate with a wire bar,
After drying to the touch, it was heated in a circulating oven at 120 ° C. for 30 minutes. The film thickness of the obtained photosensitive layer was 8 μm. The surface tackiness of the photoreceptor was 8 g · f. Except that the resin (B-7) was not used in the photosensitive layer composition, the photoreceptor prepared in the same manner had a surface adhesive strength of 400 g · f or more and showed no releasability.

On the other hand, as a primary receptor, a natural rubber sheet (manufactured by Kokugo Co., Ltd.) having a rubber hardness of 75 degrees and a thickness of 4 mm was first fixed on a hollow roller, and a methoxymethyl modified nylon copolymer was placed on the sheet. (Daiamide MX-100,
A resin layer of 2 μm (manufactured by Daicel Co., Ltd.) is provided, and the following composition is further coated on the resin layer and heated at 120 ° C. for 2 hours to cure the film to form a resin layer having a film thickness of 3 μm. I was there. The surface adhesive strength of the primary receptor was 160 g · f.

[0339]

Embedded image

Phthalic anhydride 0.2 g o-chlorophenol 0.02 g tetrahydrofuran 70 ml These were mounted on a device as shown in FIG. 2 and the surface temperature of the photoconductor was set to 50 ° C. A transfer layer having a film thickness of 3 μm was formed in the same manner as in Example 1 by using the following dispersion liquid (L-8) of resin (A). Dispersion (L-8) of resin (A) Resin particles (ARW-1) 20 g (as solid content) Positive charge control agent (CD-1) 0.09 g Charge-giving auxiliary agent 1 g

[0341]

Embedded image

Was prepared in 1 liter of Isopar G. A toner image was formed in the same manner as in Example 1 while keeping the surface temperature of the photoconductor at 50 ° C., and rinsed with Isopar L (manufactured by Exxon). Continuously, the primary receptor whose surface temperature was adjusted to 50 ° C. was pressed at a nip pressure of 4 kgf / cm ² , and transferred at a transfer speed of 50 mm / sec.
A film thickness of 150 μm as a lithographic printing plate support between the transfer backup roller heated to ℃ and the primary receptor.
The aluminum plate was passed under the conditions of a nip pressure of 7 kgf / cm ² and a transfer speed of 50 mm / sec, and was peeled off by a peeling backup roller, and the transfer layer and the toner image layer were collectively transferred onto a support. No transfer residue was found on the photoreceptor and on the primary receptor. The adhesive force between the transfer layer and the printing plate support was 1 kg · f or more, which was a level such that it could not be peeled at all.

The copied image formed on the support is 12 μm.
Even in a high-resolution area and a high-definition area such as a fine line of m, a Mincho class of 5th grade or higher, and a 4-95% area of a halftone dot area of 150 lines / inch, missing / distortion is not observed, and extremely excellent. Was something. A silicone rubber layer was uniformly applied over the entire surface of the support on which the toner image thus obtained was transferred by the following process.

100 μm whose surface was treated with polyvinyl acetate
m thick PET film (manufactured by Fuji Photo Film Co., Ltd.)
In addition, additional type silicone rubber for release paper (X56-A573)
0, manufactured by Toshiba Silicon Co., Ltd., and a mixed solution of 6 g of heptane and 36 g of heptane were applied with a wire bar and dried at 90 ° C. for 2 minutes to prepare a donor sheet (DS-1). The thickness of the silicon rubber layer was 2.2 μm.

On the other hand, a cross-linking agent (CM620, manufactured by Toshiba Silicon Co., Ltd.) was coated on a support having a toner image with a wire bar so as to have a concentration of 30 μg / cm ² . Next, the silicone rubber layer was transferred onto the printing plate support by passing the donor sheet (DS-1) over the application rollers so that the application surfaces overlapped each other. At this time, the roller pressure was set to 5 kgf / cm ² , the roller temperature was set to 90 ° C. for both upper and lower sides, and the transport speed was set to 40 cm / min. Then, the donor sheet P
When only the ET film was peeled off, a silicon rubber layer was formed on the support. The adhesive force between the silicone rubber layer and the transfer layer was 800 g · f or more. The removal and printing of the silicone rubber layer in the image area were performed in the same manner as in Example 1. As a result, 50,000 or more good prints with high-definition images and no stain on the non-image area could be obtained.

In Example 9, resin particles (ARW-
Instead of the transfer layer formed from 1), a transfer layer having the following laminated structure was formed. Formation of Transfer Layer having Laminated Structure First transfer layer; dispersion liquid (L-1) of resin (A) of Example 1
In place of the resin particles (AR-3), the resin particles (A
R-1) (Tg: 34 ° C.) 20 g (as solid content)
A high Tg first transfer layer having a film thickness of 1.5 μm is formed in the same manner except that is used. Second transfer layer; in the dispersion liquid (L-1) of the resin (A),
Instead of resin particles (AR-3), resin particles (AR-1
6) A second transfer layer of low Tg having a film thickness of 1.5 μm was formed in the same manner except that 20 g (Tg: 17 ° C.) (as solid content) was used.

The subsequent particle size was the same as in Example 9. However, transfer was performed at a transfer backup roller temperature of 90 ° C. and a transfer speed of 70 mm / sec during the second transfer. The same results as in Example 9 were obtained even under mild transfer conditions.

Example 10 In the same manner as in Example 9, the transfer layer and the toner image were transferred onto an aluminum plate. The donor sheet (DS-2) shown below was attached to the support after the toner image formation with a roller so that the silicone rubber surface of the donor sheet (DS-2) overlaps. At this time, the roller pressure was 5 kg / cm ² , and the roller temperature was 11
At 0 ° C., the transport speed was set at 20 cm / min.

Preparation of Donor Sheet (DS-2) 100 μm-thick PET whose surface was treated with polyvinyl acetate
Film (manufactured by Fuji Photo Film Co., Ltd.), 6 g of addition type silicone rubber (KS774, manufactured by Shin-Etsu Silicon Co., Ltd.)
A mixed solution of 180 mg of CTA-PL-4 (manufactured by Shin-Etsu Silicon Co., Ltd.) and 34 g of heptane was applied with a wire bar,
Heat drying and crosslinking at 90 ° C. for 2 minutes were performed to form a silicone rubber layer. The thickness of the silicone rubber layer was 2.0 μm.

Next, the donor sheet support (PET film) alone was peeled off at a speed of 10 cm / min in the direction of 150 °, and the silicon rubber layer in the non-image area was transferred onto the printing plate support. On the other hand, the silicon rubber layer in the image area remained as it was on the donor sheet support. That is, when the PET film of the donor sheet is peeled off, the silicone rubber layer adheres to the transfer layer in the non-image area to form on the printing plate support, while the toner image area is masked by toner. Therefore, the silicon rubber layer is not substantially adhered, and is easily peeled off while being in close contact with the PET surface when the donor sheet is peeled off.

The adhesive force between the transfer layer and the printing plate support was 1 kg · f or more, and the adhesive force between the silicone rubber layer and the transfer layer was 800 g · f or more. When printing was performed using this printing plate in the same manner as in Example 1, it was possible to obtain 50,000 or more good prints with clear images and no stains on non-image areas.

Further, the outlines of fine lines and characters on the printed matter are
It was sharper than the printed material of Example 9. Observation with an electron microscope and the like has revealed that this is because the phenomenon that the silicon rubber layer at the edge of the image area is obliquely scraped by rubbing the silicon rubber layer does not occur in the peel-apart method of this embodiment. .

Examples 11 to 22 In Example 2, the resin particles (A) for forming the transfer layer (T) were used.
A printing plate was prepared and printed in the same manner except that the resin particles shown in Table-D were used instead of R-1).

[0354]

[Table 4]

In each of the examples, printing was performed without missing or disturbing high resolution areas such as thin lines and thin characters, and missing or disturbing halftone dots in the high-definition image area of halftone dots in each example. As a result, 10,000 or more excellent printed matter was obtained. Example 23 In Example 9, instead of 20 g of resin particles (ARW-1) in the dispersion (L-8) of the resin (A) for forming a transfer layer, 15 g of resin particles (AR-8) (solid content) ) And 5 g of resin particles (AR-9) (as solid content) were used to form a transfer layer having a film thickness of 2.8 μm in the same manner.

A silicone rubber layer was provided as follows using a lithographic printing plate support prepared by the same method as in Example 9 and having a toner image transferred and formed thereon. A mixed solution of 9 g of the following silicone rubber base polymer, 400 mg of the following cross-linking agent (SV-1), 40 mg of catalyst (X92-1114, manufactured by Shin-Etsu Silicon Co., Ltd.) and 60 g of heptane was uniformly applied with a wire bar, and at 90 ° C. Heat drying and crosslinking were performed for 2 minutes to form a silicone rubber layer. The thickness of the silicone rubber layer is 2.21μ
m. The adhesive force between the transfer layer and the printing plate support was 1 kg · f or more, and the adhesive force between the silicone rubber layer and the transfer layer was 800 g · f or more.

[0357]

Embedded image

When the silicone rubber layer in the image area was removed and printing was carried out in the same manner as in Example 9, 50,000 or more good prints having clear images and no background stain on the non-image area were obtained. Further, instead of the resin particles (AR-9), the resin particles (A
Similar results were obtained using RW-2).

Example 24 The same procedure as in Example 23 was carried out except that the following silicone rubber base polymer was used in place of the silicone rubber base polymer. As a result, 50,000 or more good printed matters equivalent to Example 23 were obtained. I was able to.

[0360]

Embedded image

Example 25 A printing plate was prepared in the same manner as in Example 1 except that the transfer layer and the silicone rubber layer were changed as follows. Transfer Layer In the dispersion liquid (L-1) of the resin (A), the resin particles (A
Instead of 20 g (as solid content) of R-3, 20 g (as solid content) of resin particles (AR-6) was used to form a transfer layer having a thickness of 2.0 μm. Silicon rubber layer A mixed solution of 5 g of the following silicone rubber base polymer and 5 g of the following silicone polymer, 400 mg of the cross-linking agent (SV-1), 40 mg of catalyst (X92-1114, Shin-Etsu Silicon Co., Ltd.) and 60 g of heptane is uniformly wire. It was coated with a bar, dried by heating at 90 ° C. for 2 minutes and crosslinked to form a silicone rubber layer. The thickness of the silicone rubber layer is 2.50 μm
Met.

[0362]

Embedded image

When the silicone rubber layer in the image area was removed and printing was carried out in the same manner as in Example 1, 3,000 or more good prints with clear images and no background stain on the non-image area were obtained. Similar results were obtained even when the resin particles (ARW-6) were used instead of the resin particles (AR-6) in the transfer layer.

[0364]

According to the present invention, an electrophotographic waterless planographic printing plate which is applicable to a low output laser beam scanning exposure system, has excellent plate making and printing quality, and has high printing durability is produced. be able to.

[Brief description of the drawings]

FIG. 1 is a schematic diagram for explaining a method of the present invention.

FIG. 2 is a diagram showing an example of an apparatus for carrying out the method of the present invention which employs a drum system as a primary receptor.

FIG. 3 is a view showing an example of an apparatus for carrying out the method of the present invention which adopts an endless belt system as a primary receptor.

FIG. 4 is a diagram showing an example of an apparatus for carrying out the method of the present invention in which another form of endless belt system is adopted as a primary receptor.

FIG. 5 is a diagram showing an example of an apparatus for carrying out the method of the present invention in which a drum system is adopted as a primary receptor and an impression cylinder drum is adopted as a backup system for the second transfer.

FIG. 6 is a diagram showing an example of an apparatus for easily forming a transfer layer on a photoconductor by a transfer method using release paper.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Photoconductor support 2 Photosensitive layer 5 Toner image 6 Non-adhesive resin layer 10 Compound (S) application device 11 Electrophotographic photoconductor 12 Transfer layer 13 Transfer layer forming unit 14 Liquid developing unit set 14T Toner image forming unit 15 Intake / exhaust Unit 15a Intake part 15b Exhaust part 16 Heating means 17 Temperature adjusting means 18 Corona charging device 19 Exposure device 20 Primary receptor 21 Cooling part 24 Release paper 25a Heating means 25b Heating roller 25c Cooling roller 30 Lithographic printing plate support 31 Transfer backup Roller 32 Peeling backup roller

Claims (5)

[Claims] 1. A peelable transfer layer (T) mainly containing a thermoplastic resin (A) is provided on the surface of an electrophotographic photosensitive member, and non-fixing is performed on this layer by a liquid developer by an electrophotographic process. A toner image is formed, the toner image is transferred together with the transfer layer (T) onto a primary receptor, and then transferred onto a lithographic printing plate support, and the transfer layer on the support on which the toner image is formed ( After providing a non-adhesive resin layer on the entire surface of T) having a larger adhesive force to the surface of the transfer layer (T) than the adhesive force to the toner image, the non-adhesive resin layer on the toner image is selectively removed. A method for producing an electrophotographic waterless lithographic printing plate characterized by: 2. The adhesive force between the toner image and the non-adhesive resin layer is 20 gram / force or less as measured by JIS Z0237-1980 "Adhesive tape / adhesive sheet test method", and the non-adhesive property The method for producing an electrophotographic waterless lithographic printing plate according to claim 1, wherein the adhesive force between the resin layer and the surface of the transfer layer (T) is 200 gram force or more with the same adhesive force. 3. The method according to claim 1, wherein the non-adhesive resin layer on the toner image is removed by dry means. 4. The peelable transfer layer (T) contains a reactive group capable of chemically bonding at the interface between the transfer layer (T) and the non-adhesive resin layer. The method for producing an electrophotographic waterless planographic printing plate described in any one of 1. 5. The electrophotographic photosensitive member according to claim 1, wherein the surface of the electrophotographic photosensitive member has a peelability of JIS.
The electrophotographic waterless lithographic plate according to any one of claims 1 to 4, wherein the surface adhesive strength measured based on "Adhesive tape / adhesive sheet test method" of Z0237-1980 is 20 gram / force or less. How to make a printing plate.