JP3688842B2 - Intaglio for printing and color filter manufacturing method using the same - Google Patents

Description

【００５７】
【表２】

【００５８】
上記両表の結果より、突起の平均高さが２μｍを超える比較例１〜３はいずれも、インキ層の表面に突起の痕跡の凹部によると考えられる大きな凹凸があり、平坦性が不良であるとともに、印刷形状も不良であった。また凹部の平均深さが２μｍ未満である比較例３は、上記の不良に加えて、インキ層にピンホールも発生した。
【００５９】
また、凹部の平均深さが１０μｍを超えた比較例４は、凹版におけるインキの離型性が不良であった。
さらに、離型層の厚みが凹部の深さの１／２を超えた比較例５は、インキ層にピンホールが発生した。
これに対し、実施例１〜４は、上記いずれの不良も発生せず、凹版におけるインキの離型性が良好であるとともに、印刷形状の乱れのない高精度のインキ層を形成することができた。
【００６０】
【発明の効果】
以上、詳述したようにこの発明の印刷用凹版は、その凹部におけるインキの離型性が高い上、当該凹部が、インキに対して充てん不良を生じない程度の親和性をも有するものであり、かかる印刷用凹版を使用すれば、印刷形状の乱れのない高精度のカラーフィルタを製造できるという特有の作用効果を奏する。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a printing intaglio used for intaglio printing such as intaglio offset printing and a method for producing a color filter using the same.
[0002]
[Prior art]
In a liquid crystal color display that is attracting attention as a display device replacing the conventional cathode ray tube (CRT), the liquid crystal color display has three color filter layers of red (R), green (G), and blue (B). Color display is realized by using a color filter having a color filter layer and a black matrix layer separating each layer.
[0003]
Since the color filter needs to be formed with extremely high accuracy as a fine pattern with a line width of about 10 to 150 μm, the color filter has been conventionally manufactured by a so-called photolithography technique. However, it was complicated and not suitable for mass production.
In view of this, it has been studied to manufacture a color filter by a printing method that is simpler than the photolithography method and has excellent mass productivity.
[0004]
There are various printing methods, but in order to print a fine pattern such as a color filter, ink is filled in the concave portion of the intaglio, and then this ink is once transferred to the surface printing layer of the blanket. An intaglio offset printing method for transferring onto a transparent substrate, which is a substrate, is suitable. In particular, when the surface printing layer of the blanket is made of silicone rubber with excellent ink releasability, the ink on the surface printing layer is well transferred onto the transparent substrate, so the edges are sharp and the linearity is excellent. It is known that a good print pattern can be formed.
[0005]
However, because the intaglio used in the intaglio offset printing method is usually made of glass or metal and has a low ink releasability, the ink is split when transferring the ink from the intaglio to the surface printing layer of the blanket. As a result, a phenomenon may occur in which part of the intaglio plate remains in the recess without being transferred. When the ink splits, the ink transfer rate is about 50%.
[0006]
In particular, when printing a fine pattern such as a color filter, the printing shape is disturbed due to the division of the ink, which may adversely affect the image quality of the liquid crystal display.
Therefore, it is required not only to transfer from the blanket to the substrate but also from the intaglio to the blanket, to improve the ink transferability. To cope with this requirement, the surface energy value in the intaglio is changed. It has been studied to reduce the size and improve the releasability of the ink.
[0007]
For example, in Japanese Patent Application Laid-Open Nos. 8-72384 and 5-139065, the inner surface of the concave portion of the intaglio can be covered with a release layer made of a silicone polymer such as silicone rubber or silicone resin to reduce the surface energy. In addition, in Japanese Patent Laid-Open Nos. Hei 4-222174 and Hei 8-99436, it has been studied to reduce the surface energy by covering the inner surface of the recess with a release layer made of a fluororesin. ing.
[0008]
[Problems to be solved by the invention]
However, if the release layer is provided as described above to reduce the surface energy of the inner surface of the recess, the affinity between the release layer and the ink will be insufficient, and the ink will not fill properly when filling the recess. The inventors have clarified that it is likely to occur, which may cause a new problem that the printing shape is disturbed and adversely affects the image quality of the liquid crystal display.
[0009]
That is, if the affinity between the release layer and the ink is not sufficient, for example, when ink is filled into the recess by a doctor blade or the like, the ink does not spread to every corner of the recess, and the ink depends on its own surface tension. As a result of rounding in the recesses, for example, when the corners of the printed pattern are rounded, or when the line pattern is extremely fine, the surface tension causes the ink in the recesses to be cut, resulting in a line pattern There is a risk of discontinuity.
[0010]
The main object of the present invention is to provide a new intaglio for printing having high releasability of ink in the recesses and having such affinity that the recesses do not cause poor filling with respect to the ink. .
Another object of the present invention is to provide a color filter manufacturing method capable of manufacturing a high-accuracy color filter with no disturbance in printing shape.
[0011]
[Means for Solving the Problems]
As described above, in order to solve the conflicting problem of increasing the affinity of the recesses with the ink while maintaining the releasability of the ink in the recesses of the printing intaglio, the inventors, Various studies were conducted focusing on the surface shape of the release layer provided on the inner surface of the recess.
[0012]
That is, the magnitude of the surface energy of a surface with an object largely depends on the material itself constituting the object and the surface shape of the surface. In the case of an object made of the same material, the surface shape of the surface is The study was based on the prediction that the above objective could be achieved by applying the basic principle of surface energy that the surface energy would be different if different.
[0013]
  And as a result, the surface of the release layer made of silicone polymer with excellent ink releasability is not just a conventional smooth surface,Formed by applying a coating liquid containing a crosslinked silicone resin particle and an uncured liquid silicone polymer to the inner surface of the recess, and then curing the silicone polymer.If the surface shape has a large number of protrusions at a specific height, the surface energy is increased while maintaining the releasability as high as possible, and the affinity of the release layer for the ink is increased. The present inventors have found that it is possible to improve to the extent that there is no risk of poor filling during filling.
[0014]
  Therefore, the intaglio plate for printing according to the present invention has a recess having an average depth of 2 to 10 μm and filled with ink, and the inner surface of the recess isA coating solution containing an average particle size of 0.1 to 5 μm of crosslinked silicone resin particles and an uncured liquid silicone polymer in a volume ratio of 1/10 to 1/1 is applied to the inner surface of the recess. And then formed by curing the silicone polymer,It is covered with a release layer made of a silicone polymer having protrusions with an average height of 0.1 to 2 μm, a thickness of 0.05 μm or more, and a range of 1/2 or less of the depth of the recess. It is a feature.
[0015]
In addition, the color filter manufacturing method of the present invention fills the concave portions of the printing intaglio with ink, and then transfers the ink to the surface of the surface printing layer of the blanket and then to the surface of the transparent substrate. And a step of forming an ink layer on the surface of the transparent substrate.
According to this invention, as described above, the concave portion of the printing intaglio is covered with the release layer having both high releasability and suitable affinity for ink, so that the ink filling into the concave portion is poor. In addition, it is possible to prevent a printed shape from being disturbed due to a transfer failure of the blanket to the surface print layer, and to manufacture a precision printed material such as a color filter with high accuracy.
[0016]
In the present invention, the average height of the release layer protrusions is limited to 0.1 to 2 μm for the following reason.
That is, if the average height of the protrusions is less than 0.1 μm, the effect of increasing the surface energy of the release layer described above due to the provision of the protrusions cannot be obtained, and the affinity of the release layer for the ink is reduced. Thus, the filling failure and the above-described disorder of the printed shape are caused. On the other hand, when the average height of the protrusions exceeds 2 μm, the traces of the protrusions appear as concave portions on the surface of the ink layer finally formed on the surface of the transparent substrate or the like. This causes a new printing shape disorder in which the flatness is impaired.
[0017]
In the present invention, the thickness of the release layer is limited to 0.05 [mu] m or more and 1/2 or less of the depth of the recess for the following reason.
That is, when the thickness of the release layer is less than 0.05 μm, the release layer has insufficient strength, and when the printing is repeated, the release layer is peeled off or worn away relatively early. This causes a problem. On the other hand, when the thickness of the release layer exceeds 1/2 of the depth of the recess, the thickness of the ink layer finally formed on the surface of the transparent substrate or the like depends on the average depth of the recess. Insufficient, a new printed shape disorder such as a pinhole occurs in the ink layer. Moreover, the shape of a complicated recessed part may be impaired by a thick release layer, and the printing accuracy may be lowered. For example, corners or the like of the printed pattern may not be expressed as clean corners as a result of the coating liquid that forms the release layer being rounded by surface tension.
[0018]
Furthermore, in this invention, the average depth of the recesses is limited to 2 to 10 μm for the following reason.
That is, when the average depth of the recesses is less than 2 μm, the thickness of the ink layer finally formed on the surface of the transparent substrate or the like is insufficient, and the printing shape such as the pinhole described above is disturbed. In particular, in the case of a black matrix layer of a color filter, there is a problem that the thickness is too thin to obtain sufficient light shielding properties. On the other hand, if the average depth of the recesses exceeds 10 μm, the ink releasability is lowered despite the presence of the release layer, and the printing shape is disturbed due to the ink splitting during transfer to the blanket. Produce.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below.
First, the printing intaglio of the present invention will be described.
The intaglio for printing according to the present invention is a mold release made of silicone polymer having a large number of protrusions on the inner surface of the recess corresponding to the printing pattern formed on the plate surface, that is, in the case of the recess having a rectangular cross section, on the bottom and side surfaces. A layer is provided.
[0020]
The average depth of the recess is limited to 2 to 10 μm, the average height of the protrusion is limited to 0.1 to 2 μm, the thickness of the release layer is 0.05 μm or more, and 1/2 of the depth of the recess. It is limited to the following. These reasons are as described above.
The average depth of the recesses is directly related to the thickness of the ink layer formed on the surface of the transparent substrate or the like. For example, in the case of a black matrix layer of a color filter, it is preferably 5 μm or less even within the above range. . If it exceeds 5 μm, the balance with the film thickness of the other color filter layers is poor, and the surface flatness of the color filter may be impaired.
[0021]
  Further, as described above, the thickness of the release layer is preferably as thin as possible even in the above range in order to faithfully reproduce the shape of the recess as the ink layer.
  The release layer isSuddenlyFormed by coating the inner surface of the recess with a coating solution containing the crosslinked silicone resin particles that form the origin and the uncured liquid silicone polymer that forms the base of the release layer, and then curing the silicone polymer.Be done.
[0022]
  According to the above method, a release layer having excellent characteristics as described above is produced by using the same production equipment as in the case of manufacturing an intaglio having a release layer having a smooth surface. The intaglio for printing of this invention provided can be manufactured.The
  Among the above-mentioned crosslinked silicone resin particles, those composed of a three-dimensionally crosslinked silicone resin and having an average particle size of 0.1 to 5 μm are used. The particle diameter of the silicone resin particles is directly related to the average height of the protrusions in the release layer. If the average particle diameter is less than 0.1 μm, protrusions having an average height of 0.1 μm or more cannot be formed. Moreover, when the average particle diameter of the silicone resin particles exceeds 5 μm, the average height of the protrusions exceeds 2 μm.
[0023]
As such crosslinked silicone resin particles, three-dimensionally crosslinked, almost spherical particles having various average particle diameters and extremely sharp particle size distribution have been put into practical use. Then, a release layer having protrusions with a desired average height can be easily formed. Specific examples thereof include Tospearl 105 (average particle size 0.5 μm), Tospearl 120 (average particle size 2 μm), Tospearl 130 (average particle size 3 μm) in the product name “Tospearl” series manufactured by Toshiba Silicone Co., Ltd. And Tospearl 145 (average particle size 4.5 μm).
[0024]
Examples of the uncured liquid silicone polymer that forms a release layer together with the above silicone resin particles include, for example, a one-component condensation type liquid silicone rubber, a two-component condensation type liquid silicone rubber, a one-component addition type liquid silicone rubber, and a two-component addition type. Liquid silicone rubber such as liquid silicone rubber, photo-curable liquid silicone rubber such as ultraviolet curable, ionizing radiation curable liquid silicone rubber such as electron beam curable, or silicone varnish obtained by dissolving various silicone resins in solvent It can be used.
[0025]
  The blending ratio P / B of the liquid silicone polymer B and the silicone resin particles P described above in the coating liquid is P / B = 1/10 to 1/1 by volume ratio.There is a need.
  Although depending on the coating thickness of the coating liquid, etc., when the above-mentioned blending ratio P / B is less than 1/10, the effect of increasing the surface energy of the release layer described above by providing the protrusions can be obtained. Therefore, the affinity of the release layer to the ink is reduced, resulting in poor filling and the above-mentioned disorder of the printed shape.TheOn the other hand, when the blending ratio P / B exceeds 1/1, the traces of the protrusions appear as concave portions on the surface of the ink layer finally formed on the surface of the transparent substrate or the like, whereby the ink layer The flatness of theThe
[0026]
  Further, when the blending ratio P / B exceeds 1/1, excess silicone resin particles (protrusions) easily fall off from the release layer after formation, and when such dropout occurs, the release layer A new problem that the affinity of the ink with the ink fluctuates or the dropped silicone resin particles enter the ink layer as foreign matterThe
[0027]
Various methods are conceivable for forming the release layer made of the above-described coating solution on the inner surface of the concave portion of the intaglio plate, but conventionally known methods such as dipping method, spin coating method, spray coating method, bar coating method, etc. After applying the coating solution to the intaglio plate surface including the recesses by the various coating methods, the silicone polymer is cured, as described above, using the same production process as in the past, and using the same process, the release layer Is preferable.
[0028]
In the above method, a release layer is also formed on the plate surface of the intaglio plate other than the recess, and the release layer prevents ink from remaining on the plate surface when filling the recess with a doctor blade or the like. The release layer may be removed at any stage before or after curing of the coating solution. In addition, a release layer having a smooth surface may be formed on the plate surface from which the release layer has been removed. Such a release layer is formed of a conventionally known material such as a silicone polymer or a fluorine resin.
[0029]
As the intaglio plate on which the release layer is formed, a glass plate such as soda lime glass, low alkali glass, non-alkali glass, quartz glass, low expansion glass, fluorine resin, polycarbonate resin, Resin plates such as ether sulfone resin and acrylic resin, or metal plates such as stainless steel, copper, and low expansion alloys (amber, etc.) can be used. Considering this, soft glass such as soda lime glass is preferably used. The method for forming the recesses on the intaglio is the same as in the prior art.
[0030]
Next, a method for manufacturing the color filter of the present invention will be described.
The manufacturing method of the color filter of the present invention is based on the intaglio offset printing method using the intaglio plate for printing of the present invention described above, on a transparent substrate such as a glass plate, red (R), green (G), blue ( A color filter is manufactured by forming the three color filter layers B) or by forming the three color filter layers and a black matrix layer separating each layer.
[0031]
Specifically, in the printing intaglio of the present invention having a recess corresponding to any one of the above layers, the recess is filled with ink for the layer using a doctor blade or the like, and the surface of the surface printing layer of the blanket Then, the color filter is manufactured by sequentially repeating the printing process for forming the corresponding ink layer by transferring to the surface of the transparent substrate and the drying process for drying the printed ink layer for each layer. The
[0032]
The order in which the layers are formed is not particularly limited, and can be appropriately changed according to the structure of the color filter to be manufactured.
Among the above, a conventional offset printer can be used for the printing process. Conditions such as printing pressure and printing speed may be the same as those in the prior art.
As the blanket, any of various conventionally known structures can be used. In particular, as described above, in order to transfer the ink on the surface print layer onto the transparent substrate, the surface print layer is: It is preferably made of silicone rubber. In particular, the effect is large in a fine pattern having a line width of 50 μm or less.
[0033]
As the silicone rubber, various conventionally known silicone rubbers such as kneadable millable silicone rubber and the various liquid silicone rubbers described above can be used.
Of these, in order to form a surface print layer using a millable silicone rubber, an uncured rubber compound containing the millable silicone rubber as a base rubber is extruded into a sheet shape, and this is laminated on a base. And may be cured under pressure and heating. Further, in order to form a surface printing layer using liquid silicone rubber, an uncured liquid rubber composition containing the liquid silicone rubber as a base rubber is applied on the base, or the mold is filled with the base. And may be cured at room temperature or under heating.
[0034]
The hardness of the surface printing layer made of the silicone rubber is not particularly limited, but is preferably about 20 to 80 °, particularly about 40 to 60 ° in terms of JIS A hardness.
If the hardness of the surface printing layer is less than the above range, distortion during printing becomes too large, printing accuracy may be reduced, or printing pressure may be reduced, and transferability of ink from the intaglio may be reduced. is there. On the other hand, if the hardness of the surface printed layer exceeds the above range, the affinity with the ink is too high, and the ink layer is split or the edge shape is not good when transferring the transparent substrate. There is a risk that the printing accuracy will be reduced.
[0035]
The surface printed layer has a surface roughness of 10-point average roughness R_zIt is preferably 0.5 μm or less, particularly 0.3 μm or less.
When the surface roughness of the surface print layer exceeds the above range, the print shape, particularly the line linearity is disturbed, and the print accuracy may be lowered.
The surface roughness of the surface print layer is preferably as small as possible even within the above range, in consideration of printing accuracy.
[0036]
The thickness of the surface print layer is not particularly limited, but is preferably about 0.05 to 2.0 mm, particularly about 0.2 to 1.0 mm.
When the thickness of the surface printing layer is less than the above range, the flexibility of the surface printing layer becomes insufficient, and particularly when pressed against the intaglio, it becomes difficult to press-fit into the recess of the intaglio. There is a risk that the metastatic property of the lowering. On the other hand, if the above range is exceeded, the distortion during printing becomes too large, and the printing accuracy may be reduced.
[0037]
The blanket base on which the surface printed layer is formed can have the same configuration as the conventional one.
For example, as a base for a blanket used for precision printing such as a color filter, a support layer having a smooth surface alone or a compressible layer made of porous rubber is formed on the support layer. A two-layer structure or the like is preferably used.
[0038]
Among the above, as the support layer, for example, a film made of a synthetic resin such as polyethylene terephthalate (PET), polycarbonate (PC), polyethersulfone (PES), nylon, or a thin metal plate such as aluminum or stainless steel is used. can give.
The compressible layer includes an independent pore structure in which each pore is independent and a continuous pore structure in which each pore communicates with each other. In the present invention, any of these structures may be adopted. .
[0039]
Among the above, the former compressible layer having an independent pore structure is formed by, for example, dispersing a foaming agent that decomposes by heating to generate a gas in unvulcanized rubber and foaming the rubber at the same time as vulcanizing the rubber, or It is formed by dispersing hollow fine particles therein. On the other hand, the compressible layer of the latter continuous pore structure disperses particles that can be extracted with a solvent that does not affect the rubber, such as salt (water in the case of salt), in unvulcanized rubber. It is formed by a so-called leaching method in which the above particles are extracted after vulcanization.
[0040]
The rubber constituting the compressible layer is not limited to this, but for example, acrylonitrile-butadiene copolymer rubber (NBR), chloroprene rubber (CR), urethane rubber (U), etc. Sex rubber is preferably used.
What is necessary is just to comprise the thickness etc. of the said support body layer and a compressible layer similarly to the past.
[0041]
Next, in the drying step, the ink layer formed on the transparent substrate in the above printing step is subjected to a temperature and time at which the transparent substrate is not thermally deformed, usually at 180 to 250 ° C. for about 30 to 80 minutes, preferably 200 to 230. It is preferable to cure by heating and drying at 50 ° C. for about 50 to 80 minutes.
Said drying process may be performed whenever each ink layer is formed, and may be performed whenever several ink layers are formed. Or after forming all the ink layers, you may heat and dry at once.
[0042]
【Example】
(Manufacture of printing intaglio)
Example 1
On the surface of a soda lime glass plate having a thickness of 1.1 mm, a recess having a line width of 20 μm and a depth of 4 μm corresponding to a black matrix layer for a liquid crystal color display was formed by the following procedure. That is, first, a chromium vapor deposition film is formed on the entire surface of the glass plate, and then this vapor deposition film is patterned by electron beam irradiation to form a mask corresponding to the pattern of the concave portion (the concave portion of the surface of the glass plate is formed). After the portion to be formed was exposed and a mask covering the other portion was formed, the glass plate was etched with hydrofluoric acid to form the recess. The mask remaining on the surface of the glass plate was removed using a ferric chloride solution after the formation of the recesses.
[0043]
Next, on the plate surface of the above-mentioned soda lime glass substrate on which a concave portion is formed, a crosslinked silicone resin particle [previously, trade name Tospearl 105 manufactured by Toshiba Silicone Co., Ltd., average particle size 0.5 μm], An uncured two-component addition type liquid silicone rubber (mixed with a main ingredient of a trade name KS779 manufactured by Shin-Etsu Chemical Co., Ltd. and a curing agent in a ratio of 100: 1 by weight) and the volume ratio P After applying the coating solution formulated so that / B becomes 1/3, the silicone rubber is cured by a clean oven, the average height of the protrusion is 0.3 μm, and the thickness is 0.5 μm (the depth of the recess) A release layer which is 1/8 of the thickness was formed to produce a printing intaglio.
[0044]
Example 2
Crosslinked silicone resin particles [supplied by Toshiba Silicone Co., Ltd., trade name Tospearl 120, average particle size 2 μm] and uncured two-component addition type liquid silicone rubber [supra, Shin-Etsu Chemical Co., Ltd. ) Made by mixing the main agent and curing agent of trade name KS779 in a ratio of 100: 1 by weight ratio] with a volume ratio P / B of 1/3. A printing intaglio having a release layer with an average height of protrusions of 1 μm and a thickness of 0.5 μm (1/8 of the depth of the recesses) was produced in the same manner as in Example 1 except that. .
[0045]
Example 3
Other than changing the depth of the concave portion formed on the surface of the soda lime glass substrate to 8 μm and setting the blending ratio (volume ratio P / B) of the silicone resin particles and the liquid silicone rubber to 1/2 in the coating solution In the same manner as in Example 1, a printing intaglio having a release layer with an average height of protrusions of 0.3 μm and a thickness of 3 μm (3/8 of the depth of the recesses) was produced.
[0046]
Example 4
Cross-linked silicone resin particles [supplied by Toshiba Silicone Co., Ltd., trade name Tospearl 145, average particle size 4.5 μm] and uncured two-component addition type liquid silicone rubber [manufactured by Toshiba Silicone Co., Ltd.] Except for using a coating liquid in which the volume ratio P / B was 1/2 so that the main product of TSE3033 and the curing agent were mixed at a weight ratio of 1: 1). In the same manner as in Example 3, an intaglio for printing having a release layer having an average height of protrusions of 1.5 μm and a thickness of 3 μm (3/8 of the depth of the recesses) was produced.
[0047]
Comparative Example 1
Cross-linked silicone resin particles [trade name Tospearl 3120 manufactured by Toshiba Silicone Co., Ltd., average particle size 12 μm] and uncured two-component addition type liquid silicone rubber [trade name of Toshiba Silicone Co., Ltd. Except for using a coating liquid in which the volume ratio P / B was mixed to 1/3 in which the main component of TSE3033 and the curing agent were mixed at a weight ratio of 1: 1]. In the same manner as in Example 1, a printing intaglio having a release layer having an average height of protrusions of 4 μm and a thickness of 1 μm (1/4 of the depth of the recesses) was produced.
[0048]
Comparative Example 2
Cross-linked silicone resin particles (supplied by Toshiba Silicone Co., Ltd., trade name Tospearl 130, average particle size 3 μm) and uncured two-component addition type liquid silicone rubber [supra, Shin-Etsu Chemical Co., Ltd. ) Manufactured by trade name KS779 and a curing agent mixed at a weight ratio of 100: 1] was used so that the volume ratio P / B was 2/1. A printing intaglio having a release layer having an average height of protrusions of 2.5 μm and a thickness of 1 μm (1/4 of the depth of the recess) was produced in the same manner as in Example 1 except that.
[0049]
Comparative Example 3
Other than changing the depth of the concave portion formed on the surface of the soda lime glass substrate to 1 μm and setting the blending ratio (volume ratio P / B) of the silicone resin particles and the liquid silicone rubber to 1/2 in the coating solution In the same manner as in Comparative Example 2, a printing intaglio having a release layer having an average height of protrusions of 3.5 μm and a thickness of 0.3 μm (3/10 of the depth of the recesses) was produced.
[0050]
Comparative Example 4
Similar to Comparative Example 3, except that the depth of the recess formed on the surface of the soda lime glass substrate was changed to 15 μm, the average height of the protrusion was 0.2 μm and the thickness was 5 μm (the depth of the recess). A printing intaglio having a release layer which is 1/3) was produced.
Comparative Example 5
Similar to Comparative Example 2, except that the blending ratio (volume ratio P / B) of the silicone resin particles and the liquid silicone rubber was halved, the average height of the protrusions was 0.5 μm and the thickness was 3 μm. An intaglio for printing having a release layer (3/4 of the depth of the recess) was produced.
(Manufacture of color filters)
The printing intaglio plate produced in each of the above examples and comparative examples is mounted on a flat table offset printing machine, the temperature is 23 ° C., the humidity is 60%, the ink transfer speed from the printing intaglio plate to the blanket is 10 mm / second, and the blanket to the transparent substrate. Printing was performed under the condition of an ink transfer speed of 100 mm / sec.
[0051]
The blankets, transparent substrates and inks used are as follows.
Blanket: A surface print layer made of silicone rubber having a JIS A hardness of 40 °.
Transparent substrate: non-alkali glass plate [# 7059 manufactured by Dow Corning Co., Ltd.].
Ink: Black polyester ink, viscosity 600P.
[0052]
Then, after observing the concave portions of the printing intaglio and the ink layer on the transparent substrate, the releasability of the ink in the concave portions of the intaglio, the flatness of the ink layer surface, the reproducibility of the printing pattern, and the pinhole The presence or absence was evaluated according to the following criteria.
-Ink releasability:
A: No ink remains in the recess, and the ink releasability is particularly good.
[0053]
○: The ink releasability is good because only a few ink particles having a diameter of 5 μm or less remain in the recess.
X: A large amount of ink remains in the recess, and ink releasability is poor.
・ Ink layer surface flatness
A: The height difference of the ink layer surface is 0.05 μm or less, and the flatness is particularly good.
[0054]
○: The height difference of the ink layer surface is 0.5 μm or less, and the flatness is good.
X: The height difference of the ink layer surface exceeds 0.5 μm, and the flatness is poor.
-Print shape quality
○: Print shape is good without being disturbed.
X: Print shape is disturbed and print shape is defective.
・ Pinhole presence
○… No pinhole.
[0055]
×… There is a pinhole.
The above results are shown in Tables 1 and 2.
[0056]
[Table 1]

[0057]
[Table 2]

[0058]
From the results of the above tables, in Comparative Examples 1 to 3 where the average height of the protrusions exceeds 2 μm, the surface of the ink layer has large unevenness considered to be due to the recesses of the traces of the protrusions, and the flatness is poor. At the same time, the printed shape was poor. In addition, in Comparative Example 3 in which the average depth of the recesses was less than 2 μm, pinholes were also generated in the ink layer in addition to the above defects.
[0059]
Further, in Comparative Example 4 in which the average depth of the recesses exceeded 10 μm, the releasability of the ink on the intaglio was poor.
Further, in Comparative Example 5 in which the thickness of the release layer exceeded 1/2 of the depth of the recess, pinholes were generated in the ink layer.
On the other hand, in Examples 1 to 4, none of the above-described defects occurred, the release property of the ink on the intaglio plate was good, and a highly accurate ink layer without any disturbance in the printing shape could be formed. It was.
[0060]
【The invention's effect】
As described above in detail, the printing intaglio of the present invention has high releasability of ink in the concave portion, and also has an affinity that the concave portion does not cause poor filling with respect to the ink. If such an intaglio for printing is used, there is a specific effect that a high-accuracy color filter can be produced without disturbing the printed shape.

Claims (3)

Cross-linked silicone resin particles having an average depth of 2 to 10 μm, filled with ink, and having an average particle size of 0.1 to 5 μm, and an uncured liquid silicone polymer , Having a protrusion with an average height of 0.1 to 2 μm , formed by applying a coating liquid blended at a volume ratio of 1/10 to 1/1 on the inner surface of the recess and then curing the silicone polymer . An intaglio for printing, which is covered with a release layer made of a silicone polymer having a thickness of 0.05 μm or more and within a range of ½ or less of the depth of the recess.   An ink is filled in the recesses of the printing intaglio according to claim 1, and then the ink is transferred to the surface of the blanket surface printing layer, and then transferred to the surface of the transparent substrate. A method for producing a color filter, comprising a step of forming a layer. The method for producing a color filter according to claim 2 , wherein the surface printing layer of the blanket is formed of silicone rubber.