JP4140758B2 - Blanket for offset printing and offset printing method - Google Patents

Description

【００５６】
上記組成の導電性インキの粘度は、２３℃、ズリ速度１０（１／Ｓ）において、約７０００Ｐの高粘度であった。上記組成の導電性インキの有機成分は、焼成により除去可能である。
【００５７】
印刷
図３及び図４に示す平凹版オフセット印刷機（（株）紅羊社製作所製）を用いて、２．８ｍｍ厚×４２インチサイズのガラス基板上にウエットオンウエットで重ねて印刷を行った。印刷条件は、印刷版へのインキを詰める充填速度及びインキをガラス基板へ転移する転移速度を各５００ｍｍ／秒とし、印刷版からブランケットに受ける受理速度を５０ｍｍ／秒とし、印刷版及びガラス印圧を０．２ｍｍ、印刷版及びガラス温度を２０℃とし、印刷パターンとしてＬ／Ｓ＝１００／１００μ（但し、Ｌは印刷部分、Ｓはスペースを意味する）とした。使用するブランケットは前記工程で得られたものを使用した。印刷版は、水なし版で版溝が４μｍのＤＧ２（商品名：東レ（株）製）を使用した。
【００５８】
印刷後、２００℃で１０分間乾燥し、ピーク温度６００℃で焼成を行い、ＰＤＰ用アドレス電極を形成した。得られた電極は、線幅１００±５μ、厚み２±１μであった。得られた印刷物について観察したところ、細線の乱れ（うねり）の発生や、細線の断線の発生が無く、面内バラツキの小さいものが形成でき、２０００枚以上の安定した印刷を確認した。
【００５９】
その結果を下記の表１に示す。
【００６０】
【表１】

【００６１】
【発明の効果】
本発明の付加硬化型シリコーンゴム組成物を用いて形成したオフセット印刷用ブランケットは、印刷を繰返して続けても、インキの受理性が常に安定し、耐刷性に優れている。
【図面の簡単な説明】
【図１】本発明のブランケットの層構成の一例を示す断面図である。
【図２】本発明のブランケットを用いた微細パターン形成を説明する図である。
【図３】本発明のブランケットを用いた、微細な電極パターンを形成するための平凹版オフセット印刷機の一例を示す側面図である。
【図４】図３に示される平凹版オフセット印刷機の平面図である。
【図５】基布の積層構造を示す。
【図６】図６は支持フィルム５の剥離前のラミネート体の層構成を示す。
【符号の説明】
１ ブランケット
２ 基布
３ 接着層
４ 表面ゴム層
５ 支持フィルム
１０ 凹版
１１ 凹部
１２ インキ
１３ ブランケット胴
１４ 透明ガラス基板
２１ 平凹版オフセット印刷機
２２ 基台
２３ 印刷定盤
２４ 印刷版盤
２５ ガイドレール
２６ 印刷ヘッド
２７ ブランケットロール
２８ 第１のインキングロール群
２９ 第２のインキングロール群
３０ インキブレード
３１ 電極パターン被形成体
３２ 印刷版
２０１、２０３、２０５ 綿布
２０２ 接着層
２０４ 圧縮層[0001]
BACKGROUND OF THE INVENTION
INDUSTRIAL APPLICABILITY The present invention uses a silicone rubber composition suitable for producing a blanket in which ink acceptability is always stable and excellent in printing durability, a blanket produced using the silicone rubber composition, and the blanket. The present invention relates to a printing method, and a thick film pattern, a plasma display application member, a color filter, and an electromagnetic wave shielding member to which the printing method is applied.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a printing method is known in which ink held on an intaglio or plano-intaglio on which a desired pattern is formed is received on the surface of a blanket and further transferred from the blanket surface to a substrate. The characteristics of the blanket greatly affect the reproducibility of the printed pixel shape and the stability during continuous printing.
[0003]
An example of printing a colored layer for a liquid crystal color filter by intaglio offset printing using a silicone blanket has been reported (Japanese Patent Laid-Open No. 62-85202: Color filter having a colored layer with a line width of about 100 to 300 μm). Manufacturing method). Silicone blankets generally have an advantage of a high ink transfer rate from the blanket to the glass plate because of their low critical surface tension and low wettability to ink.
[0004]
However, a blanket with low wettability has poor ink acceptability from the plate to the blanket and tends to repel ink on the blanket. For this reason, it is difficult to obtain the resolving power necessary to clearly reproduce a pattern having a narrow line width (about 20 μm) such as a black matrix layer. Patent No. 3153033 proposes that a blanket having a high ink transfer rate and fine line reproducibility can be realized by using a linear organosiloxane as a blanket material.
[0005]
[Problems to be solved by the invention]
However, when the blanket manufactured using linear organosiloxane is repeatedly printed, the amount of ink received gradually decreases when the ink retained on the intaglio or plano-intaglio is accepted by the blanket, that is, Ink acceptability from the plate to the blanket deteriorated, and there was a problem that the fine line was disturbed (waviness) or the fine line was broken.
[0006]
Accordingly, the present invention provides a silicone rubber composition suitable for producing a blanket that has a stable ink acceptability and excellent printing durability even when printing is repeated, and a production using the silicone rubber composition. It is an object of the present invention to provide a blanket, a printing method using the blanket, and a thick film obtained by applying the printing method.
[0007]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the addition-curable silicone rubber composition of the present invention contains the following components A to E as essential components, the components A to E having the following blending ratio, and a durometer after curing. An addition-curable silicone rubber composition having a hardness according to A [conforming to JIS (K6249)] of 60 to 95.
[0008]
Component A: having at least two vinyl groups bonded to silicon atoms in one molecule, the vinyl group content is in the range of 1 × 10 ⁻³ mol / g to 1 × 10 ⁻⁵ mol / g, And 50 to 20 parts by weight of a linear organopolysiloxane in which 90% or more of all organic groups including alkenyl groups are methyl groups,
[0009]
B component: R ₃ SiO _1/2 unit (wherein R ₃ is an unsubstituted or substituted monovalent hydrocarbon group) and SiO ₂ unit as main components, R ₃ SiO _1/2 unit and SiO ₂ unit The molar ratio [R ₃ SiO _1/2 / SiO ₂ ] is 0.5 to 1.2, and at least two vinyl groups are contained in one molecule, and the vinyl group content is 1 × 10 ⁻ in the range of ^{2 mol / g~1 × 10 -4 mol} / g resinous copolymer is from 50 to 80 parts by weight,
[0010]
Component C: an organohydrogenpolysiloxane containing at least two hydrogen atoms bonded to silicon atoms in one molecule and having a Si-H group content in the range of 0.015 mol / g to 0.0025 mol / g Is 2.0 to 30 parts by weight with respect to 100 parts by weight of the total of component A and component B,
[0011]
Component D: The inorganic filler having an average particle diameter of 50 μm or less is 0 to 100 parts by weight with respect to 100 parts by weight of the total of the component A and the component B
E component: 0.5-100 ppm of addition reaction catalyst.
[0012]
The blanket of the present invention is characterized in that the surface rubber layer constituting the outermost surface of the blanket is formed using the addition-curable silicone rubber composition.
[0013]
In the printing method of the present invention, the ink retained on the intaglio or plano-intaglio in which the desired pattern is formed is transferred to the surface rubber layer of the blanket mounted on the cylinder of the printing machine, and then the blanket is made of glass, The ink is transferred onto a substrate such as a film.
[0014]
The method for producing a thick film pattern of the present invention is characterized in that the thick film pattern is produced by applying the printing method of the present invention, and the product relating to the thick film pattern includes, for example, a color filter and a plasma display application. Examples thereof include members (more specifically, electrodes for plasma display) and electromagnetic wave shielding members.
[0015]
The blanket formed by using the addition-curable silicone rubber composition of the present invention for the surface rubber layer constituting the outermost surface of the blanket is a method of accepting an ink held on an intaglio or plano-intaglio in which a desired pattern is formed, Furthermore, even when the blanket surface is transferred to the base material, the ink acceptability is always stable and the printing durability is excellent.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Blanket FIG. 1 is a cross-sectional view showing an example of the layer structure of the blanket of the present invention. In FIG. 1, a blanket 1 includes a base fabric 2 including a compression layer (not shown), and a surface rubber layer 4 formed on the base fabric 2 with an adhesive layer 3 interposed therebetween.
[0017]
The base fabric 2 serves to prevent the blanket 1 from being stretched under tension when the blanket 1 is mounted on a cylinder (not shown) of a printing press, and is a known base used for a conventional blanket. Cloth can be used. The base fabric 2 includes one or more layers of cloth (not shown) and a compression layer (not shown), and an adhesive layer (not shown) for bonding the cloth (not shown). It may be provided.
[0018]
The compression layer (not shown) has a sponge-like structure, and when pressure is applied to the surface rubber layer 4 from the outside, the compression layer is compressed and absorbs stress to deform the surface rubber layer 4 ( It has the role of preventing the occurrence of bulge phenomenon) and the deterioration of the dimensional accuracy of the printed pattern. The surface rubber layer 4 has a function of receiving the ink retained on the intaglio and then transferring the received ink to the substrate (printed material).
[0019]
The adhesive layer 3 provided on the base fabric 2 is provided to strengthen the adhesion between the base fabric 2 and the surface rubber layer 4. The adhesive layer 3 can be formed of a material such as a silicone resin. The thickness of the adhesive layer 3 is preferably about 0 to 500 μm, and can be omitted if there is an anchor effect between the base fabric 2 and the surface rubber layer 4.
[0020]
In the above example, the blanket 1 is a so-called compressible type blanket, but the present invention is not limited to this, and may be a solid type blanket without a compression layer. Further, a plastic film such as a PET film can be used instead of the base fabric 2.
[0021]
In the present invention, the silicone rubber that can be used to form the surface rubber layer 4 contains the A to E components in the above blending ratio, and has a hardness of 60 to 95 by durometer A after curing (conforming to JIS (K6249)). An addition-curable silicone rubber composition is used.
[0022]
Next, an example of a method for manufacturing the blanket 1 will be described. The surface rubber layer 4 is formed by coating on a releasable support film such as a PET film. On the other hand, the adhesive layer 3 is formed on the base fabric 2 including the compression layer by coating. Next, the surface rubber layer 4 on the support film is pressed and adhered to the adhesive layer 3, and then the surface rubber layer 4 is cured. Next, the support film is peeled to make a blanket 1.
[0023]
Cotton cloth, polyester cloth, nylon cloth, vinylon cloth, etc. can be used as the base cloth, and PET film, PP film, polyimide film, PEN film, PPS film, metal foil, etc. are used as the base film instead of the base cloth. it can. As the adhesive layer of the blanket, silicone rubber having a Type A hardness of 30 to 80 ° according to JIS (K6253) durometer hardness test, NBR (acrylonitrile-butadiene rubber), CR (chloroprene rubber), IIR (butyl rubber), EPDM (ethylene) -Propylene rubber) can be used.
[0024]
Addition-curable silicone rubber composition A component: The A component has at least two vinyl groups bonded to silicon atoms in one molecule, and the vinyl group content is 1 × 10 ⁻³ mol / g to 1 ×. It is a linear organopolysiloxane in the range of 10 ⁻⁵ mol / g and 90% or more of all organic groups including alkenyl groups are methyl groups. The linear organopolysiloxane lowers the critical surface tension of the blanket, lowers the wettability of the blanket with respect to ink, and imparts ink transferability.
[0025]
If the A component is less than 20 parts by weight, the ink wettability cannot be expected to deteriorate, and the ink transferability is inferior. If it exceeds 50 parts by weight, the ink acceptability deteriorates as the number of printed sheets increases. Therefore, the printing durability is inferior. In the linear organopolysiloxane of component A, if the vinyl group content is less than 1 × 10 ⁻⁵ mol / g, the ink transfer property is inferior, and exceeds 1 × 10 ⁻³ mol / g. Inferior printing durability.
[0026]
Component B: Component B is composed mainly of R ₃ SiO _1/2 units (wherein R ₃ is an unsubstituted or substituted monovalent hydrocarbon group) and SiO ₂ units, and R ₃ SiO _1/2 units The molar ratio [R ₃ SiO _1/2 / SiO ₂ ] to the SiO ₂ unit is 0.5 to 1.2, and contains at least two vinyl groups in one molecule, and the vinyl group content is It is a resinous copolymer having a range of 1 × 10 ⁻² mol / g to 1 × 10 ⁻⁴ mol / g.
[0027]
Since component B is a resinous copolymer, it gives strength to the blanket and imparts printing durability. That is, even when repeated printing is performed with a blanket using an addition-curable silicone rubber composition containing a component B, the amount of transfer ink is always stable. That is, the ink acceptability from the plate to the blanket deteriorates, and the inconvenience that the fine line is disturbed (waviness) or the fine line is broken is prevented. If the B component is less than 50 parts by weight, the printing durability is inferior, and if it exceeds 80 parts by weight, the transferability of the ink from the blanket to the substrate is inferior.
[0028]
In the resinous copolymer of component B, [R ₃ SiO _1/2 / SiO ₂ ] is used to represent the balance between ink transferability and printing durability. If it exceeds 1.2, the printing durability will be inferior. In the resinous copolymer of component B, at least two vinyl groups are contained in one molecule, and the vinyl group content is in the range of 1 × 10 ⁻² mol / g to 1 × 10 ⁻⁴ mol / g. It is necessary for printing durability and ink transfer. When the vinyl group content is less than 1 × 10 ⁻⁴ mol / g, the ink transfer property is inferior, and when it exceeds 1 × 10 ⁻² mol / g, the printing durability is inferior.
[0029]
C component: The C component contains at least two hydrogen atoms bonded to a silicon atom in one molecule, and the Si-H group content is in the range of 0.015 mol / g to 0.0025 mol / g. Genpolysiloxane.
[0030]
SiH in the component C is a crosslinking group, functions as a crosslinking agent, and copolymerizes with the vinyl group contained in the component A and the component B. By using component C, the liquid rubber material is cured by an addition reaction and can be used as a surface rubber layer constituting the outermost surface of the blanket. If component C is less than 2.0 parts by weight with respect to 100 parts by weight of the total amount of component A and component B, crosslinking is insufficient and sufficient rubber properties cannot be obtained. The C component of the reaction worsens the ink acceptance and transferability. When the content of Si-H group exceeds 0.015 mol / g in the addition-crosslinking type silicone rubber of component C, the unreacted component C deteriorates the ink acceptability / transferability, and less than 0.0025 mol / g. In this case, crosslinking is insufficient and sufficient rubber properties cannot be obtained.
[0031]
The C component consists of R ₂ HSiO _1/2 units and SiO ₂ units, and [R ₂ HSiO _1/2 / SiO ₂ ] in the C component is used to express the strength of the function as a cross-linking agent. If it is less than 5, crosslinking will be insufficient, and if it exceeds 2.0, ink acceptability / transferability is deteriorated.
[0032]
D component: The D component is an inorganic filler having an average particle size of 50 μm or less. The D component, like the B component, imparts strength to the blanket and imparts printing durability. That is, even when repeated printing is performed with a blanket using an addition-curable silicone rubber composition containing a D component, the amount of transfer ink is always stable. Since component D is an optional component, it may be zero parts by weight. When the D component exceeds 100 parts by weight with respect to 100 parts by weight of the total amount of the A component and the B component, the rubber becomes brittle, and rubber properties such as tensile strength are deteriorated. When the particle size of the inorganic filler exceeds 50 μm, the smoothness of the surface rubber layer of the blanket deteriorates, which is not preferable.
[0033]
As the inorganic filler of component D, one or more selected from fumed silica, precipitated silica, quartz powder, diatomaceous earth, talc, clay, mica, alumina, titanium oxide, iron oxide, and carbon can be used.
[0034]
E component: The E component is a catalyst for promoting the addition reaction between the C component, the A component and the B component. For example, platinum black, platinous chloride, chloroplatinic acid, chloroplatinic acid and monohydric alcohol And platinum group metal catalysts such as platinum-based catalysts such as platinum bisacetoacetate, palladium-based catalysts, and rhodium-based catalysts.
[0035]
Printing method Using the blanket cylinder equipped with the blanket 1 of the present invention as described above, the ink retained on the intaglio or plano-intaglio on which the desired pattern is formed is transferred to the surface rubber layer of the blanket cylinder. After that, printing is performed by transferring ink from the blanket cylinder onto a substrate (glass, film, etc.).
[0036]
For example, FIG. 2 is a diagram for explaining fine pattern formation in thick film formation using the blanket of the present invention by intaglio offset printing. In FIG. 2, first, ink 12 is filled into the recess 11 formed in a predetermined pattern on the intaglio 10 (FIG. 2A). Next, the blanket cylinder 13 on which the blanket of the present invention is mounted is pressed on the intaglio 10 while being rotated, and the ink 12 in the recess 11 is transferred onto the blanket cylinder 13 (FIG. 2B). Then, the blanket cylinder 13 is pressure-bonded to the transparent glass substrate 14 which is a printing object, whereby the ink 12 on the blanket cylinder 13 is transferred to the transparent glass substrate 14 to form a fine pattern (FIG. 2C).
[0037]
The intaglio plate depth in such intaglio offset printing is preferably 50 μm or less, and more preferably in the range of 1 to 30 μm.
[0038]
As another printing method, FIG. 3 is a side view showing an example of a plano-intaglio offset printing machine for forming a fine electrode pattern using the blanket of the present invention, and FIG. 4 is a plano-intaglio plate shown in FIG. It is a top view of an offset printing machine. 3 and 4, the planographic intaglio offset printing machine 21 includes a base plate 22 in which a printing surface plate 23 and a printing plate plate 24 are arranged at a predetermined interval, and two guide rails 25 and 25 are laid in parallel. And a print head 26 that can be freely moved on the guide rails 25 by a moving mechanism (not shown).
[0039]
The print head 26 is provided with an up and down blanket roll 27 and a first inking roll group 28. The first inking roll group 28 includes a kneading roller that swings in the direction of the rotation axis of the roll, and an inking roll that applies ink to the printing plate. The base 22 is provided with a second inking roll group 29 and an ink blade 30 for storing conductive ink. The second inking roll group 29 is composed of an ink discharge roll that ejects ink from the ink blade 30 and a kneading roller that swings in the rotation axis direction of the roll.
[0040]
In the planographic intaglio offset printing machine 21, an electrode pattern formed body 31 (shown by a one-dot chain line in FIG. 4) is placed on a printing surface plate 23, and a printing plate 32 (shown by a one-dot chain line in FIG. 4). Mounted on the printing platen 24. The print head 26 first moves on the guide rails 25, 25 onto the second inking roll group 29. Here, the conductor ink kneaded and uniformed by the second inking roll group 29 is transferred to the first inking roll group 28 of the print head 26. Next, the printing head 26 moves on the guide rails 25, 25 toward the printing platen 24, and applies the conductive ink to the printing plate 32 by the inking roll of the first inking roll group 28. Thereafter, the print head 26 returns to the second inking roll group 29 side on the guide rails 25, 25, and the conductive ink kneaded and uniformed by the second inking roll group 29 again becomes the print head. Transferred to 26 first inking roll groups 28. During this time, the blanket roll 27 is raised to a position where it does not contact the printing plate 32. This ink application operation may be performed a plurality of times.
[0041]
Next, the print head 26 moves toward the printing surface plate 23 with the blanket roll 27 lowered to the printing position. When the print head 26 passes through the printing plate 24, the conductor ink on the image line portion of the printing plate 32 is transferred to the blanket roll 27, and at the same time, by the inking roll of the first inking roll group 28. Conductive ink is newly applied to the printing plate 32. The print head 26 further moves toward the printing surface plate 23, and the conductive ink is printed from the blanket roll 27 onto the electrode pattern formed body 31 placed on the printing surface plate 23. Thereafter, the print head 26 returns to the second inking roll group 29 side.
[0042]
In addition, when the print head 26 returns to the second inking roll group 29 side, printing may be performed on the electrode pattern forming body 31 by the blanket roll 27. Further, when the print head 26 returns to the second inking roll group 29 side, it returns while transferring the conductive ink from the printing plate 32 to the blanket roll 27, and the print head 26 moves again toward the printing surface plate 23. Sometimes, the conductive ink may be superposed on the blanket roll 27 and transferred. By doing in this way, an electrode pattern can be printed thickly and generation | occurrence | production of a hole can be prevented.
[0043]
【Example】
Addition-curable silicone rubber composition The following components A to E were mixed to prepare an addition-curable silicone rubber composition. The mixing ratios (parts by weight) of the components A to E were combinations shown in Table 1.
[0044]
A component: The viscosity in 25 degreeC is 5000 mPa.s. Dimethylpolysiloxane in which both ends of the molecular chain as s are blocked with dimethylvinylsiloxy groups.
[0045]
B component: (CH ₃ ) ₃ SiO _1/2 unit, (CH ₂ ═CH) (CH ₃ ) ₂ SiO _1/2 unit and SiO ₂ unit, with the molar ratio of the following formula and the following vinyl group content A resinous copolymer.
[Total of (CH ₃ ) ₃ SiO _1/2 units and (CH ₂ ═CH) (CH ₃ ) ₂ SiO _1/2 units] / SiO ₂ units = 0.8 (molar ratio)
Vinyl group content = 0.0008 mol / g
[0046]
Component C: a copolymer comprising (CH ₃ ) ₂ HSiO _1/2 units and SiO ₂ units and having a molar ratio of the following formula and the following SiH group content.
(CH ₃ ) ₂ HSiO _1/2 unit / SiO ₂ unit = 1.4 (molar ratio)
SiH group content = 0.0092 mol / g
[0047]
D component: Quartz powder with an average particle size of 1.5 μm
Component E: 1% propyl alcohol solution of chloroplatinic acid (blended to be 0.2 parts by weight, that is, 20 ppm with respect to 100 parts by weight of the total amount of the components A and B)
[0049]
Production of blanket and its configuration Step 1: As the releasable support film 5 (shown in FIG. 6), a 125 μm-thick PET film (Lumirror T60: trade name, manufactured by Toray Industries, Inc.) was used. On the support film 5, the addition-curable silicone rubber composition prepared in the above step is applied, and drying and crosslinking are performed in a drying furnace at 120 ° C. for 10 minutes to form the surface rubber layer 4 (shown in FIG. 6). Formed.
[0050]
Step 2: On the other hand, a base fabric having a laminated structure shown in FIG. 5 was prepared. In FIG. 5, 2 is a base cloth, 201 is a cotton cloth having a thickness of 0.3 mm, 203 is a cotton cloth having a thickness of 0.3 mm, 205 is a cotton cloth having a thickness of 0.2 mm, and 202 is a film for bonding the cotton cloths together. An adhesive layer of acrylonitrile-butadiene rubber having a thickness of 0.3 mm, and 204 is a compression layer having a sponge structure of acrylonitrile-butadiene rubber having a thickness of 0.5 mm.
[0051]
The following adhesive layer was formed on the base fabric 2 having the above laminated structure. That is, paramethylbenzoyl peroxide (C-23, trade name, manufactured by Shin-Etsu Chemical Co., Ltd.) is added to 100 parts by weight of silicone rubber (KE-571-U, trade name, manufactured by Shin-Etsu Chemical Co., Ltd.). What added 1.5 weight part was prepared, and this preparation was calender-molded on the cotton fabric 205 of the base fabric 2, and the contact bonding layer 3 (shown in FIG. 6) with a film thickness of 200 micrometers was formed.
[0052]
Step 3: The surface rubber layer 4 formed on the support film 5 obtained in the step 1 and the adhesive layer 3 formed on the base fabric 2 obtained in the step 2 are such that bubbles do not engage with each other. Lamination was performed to obtain a laminate.
[0053]
Step 4: The laminate obtained in Step 3 was pressed under the conditions of 1 kgf / cm ² , 120 ° C., and 20 minutes with a flat hot press. As a result, the adhesive layer 3 was cross-linked, and the laminate was completely adhered.
[0054]
Process 5: The support film 5 was peeled from the laminate obtained in the process 4 to obtain a blanket of this example. FIG. 6 shows the layer structure of the laminate before the support film 5 is peeled off. In FIG. 6, 3 is an adhesive layer made of silicone rubber, 4 is a surface rubber layer, and 5 is a support film.
[0055]
Ink used for printing A conductive ink having the following composition was prepared.

[0056]
The conductive ink having the above composition had a high viscosity of about 7000 P at 23 ° C. and a shear rate of 10 (1 / S). The organic component of the conductive ink having the above composition can be removed by baking.
[0057]
Printing Using a planographic intaglio offset printing machine shown in FIGS. 3 and 4 (manufactured by Kouyousha Mfg. Co., Ltd.), a 2.8 mm thick × 42 inch size glass substrate is stacked on a wet on wet basis. Printing was done. The printing conditions were such that the filling speed for filling the printing plate with ink and the transfer speed for transferring the ink to the glass substrate were 500 mm / second each, the receiving speed received from the printing plate to the blanket was 50 mm / second, and the printing plate and glass printing pressure. Was 0.2 mm, the printing plate and the glass temperature were 20 ° C., and the printing pattern was L / S = 100/100 μ (where L represents a printed portion and S represents a space). The blanket used was the one obtained in the above step. As the printing plate, DG2 (trade name: manufactured by Toray Industries, Inc.) with a waterless plate and a plate groove of 4 μm was used.
[0058]
After printing, the film was dried at 200 ° C. for 10 minutes and baked at a peak temperature of 600 ° C. to form an address electrode for PDP. The obtained electrode had a line width of 100 ± 5 μ and a thickness of 2 ± 1 μ. When the obtained printed matter was observed, it was confirmed that stable printing of 2,000 sheets or more could be formed without the occurrence of turbulence (swells) of fine lines or the occurrence of disconnection of fine lines, and with small in-plane variations.
[0059]
The results are shown in Table 1 below.
[0060]
[Table 1]

[0061]
【The invention's effect】
The offset printing blanket formed using the addition-curable silicone rubber composition of the present invention has stable ink acceptability and excellent printing durability even when printing is repeated.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an example of a layer structure of a blanket of the present invention.
FIG. 2 is a diagram illustrating fine pattern formation using the blanket of the present invention.
FIG. 3 is a side view showing an example of a planographic intaglio offset printing machine for forming a fine electrode pattern using the blanket of the present invention.
FIG. 4 is a plan view of the planographic intaglio offset printing machine shown in FIG.
FIG. 5 shows a laminated structure of a base fabric.
FIG. 6 shows the layer structure of the laminate before peeling off the support film 5;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Blanket 2 Base cloth 3 Adhesive layer 4 Surface rubber layer 5 Support film 10 Intaglio 11 Recess 12 Ink 13 Blanket cylinder 14 Transparent glass substrate 21 Plane intaglio offset printing machine 22 Base 23 Printing surface plate 24 Printing plate 25 Guide rail 26 Printing Head 27 Blanket roll 28 First inking roll group 29 Second inking roll group 30 Ink blade 31 Electrode pattern formed body 32 Printing plates 201, 203, 205 Cotton cloth 202 Adhesive layer 204 Compression layer

Claims (4)

The surface rubber layer constituting the outermost surface of the blanket is a printing blanket formed using an addition-curable silicone rubber composition containing the following components A to E as essential components, and the components A to E are as follows: A blanket for printing, wherein the addition-curing silicone rubber composition has a hardness of 60 to 95 according to durometer A [conforming to JIS (K6249)] after curing:
Component A: having at least two vinyl groups bonded to silicon atoms in one molecule, and the vinyl group content is 1 × 10 ^-3 mol / g to 1 × 10 ^-Five 50-20 parts by weight of a linear organopolysiloxane having a mol / g range and 90% or more of all organic groups including alkenyl groups are methyl groups,
B component: R _Three SiO _1/2 Unit (in the formula, R _Three Is an unsubstituted or substituted monovalent hydrocarbon group) and SiO ₂ The unit is the main component, R _Three SiO _1/2 Unit and SiO ₂ Molar ratio with unit [R _Three SiO _1/2 / SiO ₂ ] Is 0.5 to 1.2, and at least two vinyl groups are contained in one molecule, and the vinyl group content is 1 × 10 ^-2 mol / g to 1 × 10 ^-Four 50-80 parts by weight of a resinous copolymer having a mol / g range,
Total amount of component A and component B: 100 parts by weight
Component C: an organohydrogenpolysiloxane containing at least two hydrogen atoms bonded to silicon atoms in one molecule and having a Si-H group content in the range of 0.015 mol / g to 0.0025 mol / g Is 2.0 to 30 parts by weight with respect to 100 parts by weight of the total amount of the component A and the component B,
Component D: The inorganic filler having an average particle size of 50 μm or less is 0 to 100 parts by weight with respect to 100 parts by weight of the total amount of the component A and the component B,
E component: 0.5-100 ppm of addition reaction catalyst. The C component is R ₂ HSiO _1/2 Unit (in the formula, R ₂ Is an unsubstituted or substituted monovalent hydrocarbon group) and SiO ₂ The unit is the main component, R ₂ HSiO _1/2 Unit and SiO ₂ Molar ratio with unit [R ₂ HSiO _1/2 / SiO ₂ Is in the range of 0.5 to 2.0. The printing blanket according to claim 1. The D component is one or more selected from fumed silica, precipitated silica, quartz powder, diatomaceous earth, talc, clay, mica, alumina, titanium oxide, iron oxide and carbon. The printing blanket according to 1. The ink retained on the intaglio or plano-intaglio in which the desired pattern is formed is transferred to the surface rubber layer of the blanket according to any one of claims 1 to 3 mounted on the cylinder of the printing press, and thereafter A printing method comprising transferring ink from the blanket onto a substrate.

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