JPWO2016024446A1 - Method for producing flexographic printing plate and method for producing liquid crystal display element - Google Patents

Abstract

[PROBLEMS] To provide a flexographic printing plate that has a large size and excellent thickness accuracy and is excellent in positional accuracy of a pattern to be formed, and can be manufactured with a high yield by simplifying the structure and combination of the underlying divided body. And the manufacturing method of the liquid crystal display element using the flexographic printing plate manufactured by this manufacturing method is provided. A method of manufacturing a flexographic printing plate includes a plurality of divided bodies 4 bonded to a pressure-sensitive adhesive surface 10 of a pressure-sensitive adhesive sheet 11 via a spacer 13, and a reinforcing sheet 2 bonded to the pressure-sensitive adhesive sheet. 11 and the spacer 13 are removed, the photosensitive resin composition is filled in the gap from which the spacer 13 is removed, and a curing reaction is performed by irradiating actinic rays, thereby integrating the plurality of divided bodies 4. The manufacturing method of a liquid crystal display element includes the process of forming a liquid crystal aligning layer by flexographic printing using this flexographic printing plate.

Description

  The present invention relates to a method for producing a flexographic printing plate used for forming, for example, a liquid crystal alignment film of a liquid crystal display device, and a method for producing a liquid crystal display device using a flexographic printing plate produced by such a production method. .

  In order to form a liquid crystal alignment film that requires high coating quality, that is, as thin as possible, without pinholes, etc., on the electrode forming surface of the substrate constituting the liquid crystal display element, it has good printing characteristics. Has flexographic printing.

  A flexographic printing plate used for flexographic printing is generally provided with an ink transfer layer whose one surface is a printing surface that retains ink during printing. In many cases, a reinforcing sheet made of various plastics is laminated on the surface of the ink transfer layer opposite to the printing surface.

  The flexographic printing plate is required to have as high a thickness accuracy as possible over the entire surface in order to form a liquid crystal alignment film having a uniform thickness by maintaining a constant printing pressure and improving printing accuracy. In particular, recently, it has been required to increase the accuracy of the thickness, which was conventionally ± 30 μm, to ± 15 μm.

  However, with the recent increase in size of flexographic printing plates due to the increase in size of liquid crystal display elements, there is a problem that it is becoming difficult to maintain the accuracy of the thickness. Particularly in large flexographic printing plates such as G6 size (1560 mm × 2065 mm) to G8 size (2300 mm × 2780 mm), the decrease in thickness accuracy is remarkable.

  Therefore, a plurality of sheet-like divided bodies that are the basis of at least the ink transfer layer of the flexographic printing plate are prepared, and the printing surface of each divided body is patterned in advance corresponding to a predetermined printing pattern, and then connected. In addition, it has been studied to produce a large flexographic printing plate (Patent Document 1).

  According to such a manufacturing method, since the individual divided bodies can be formed in a smaller size that is easy to improve the thickness accuracy, the thickness accuracy of the entire flexographic printing plate can be improved.

JP 2009-83112 A

  However, it is not easy to connect the divided bodies so that the patterns formed on the printing surfaces of the individual divided bodies are arranged between the divided bodies in the plane direction with a positional accuracy of micron order.

  Therefore, in the invention described in Patent Document 1, attention is paid to improving the accuracy of joining, and consequently the positional accuracy of the pattern, by forming alignment marks on each divided body and using the alignment sheet together. Yes.

  However, it is not easy to align a plurality of divided bodies by using the alignment marks and sheets, and it takes time and effort to connect them.

  In addition, according to the inventor's study, when the reinforcing sheet is finally bonded to the entire surface of the plurality of divided bodies that are joined together, the resin filled in the joining portion is in the surface direction due to the stress applied to the divided bodies. As the pattern is stretched, defects that reduce the positional accuracy of the pattern frequently occur.

  Therefore, in the invention described in Patent Document 1, there is a problem that the yield of the product is significantly reduced in combination with the complicated positioning operation as described above.

  Further, in the invention described in Patent Document 1, the divided bodies are joined to each other by a polymerizable resin only at the end face, and in order to prevent the divided bodies from warping when the resin shrinks during polymerization, An uneven shape is formed on the body. Therefore, there is a problem that the structure of each divided body becomes complicated and the combination of divided bodies becomes complicated.

  An object of the present invention is to provide a flexographic printing plate that is excellent in overall thickness accuracy even in a large size such as G6 or more and also excellent in positional accuracy of a pattern formed on a printing surface. It is to provide a manufacturing method that can be manufactured with high yield by simplifying the structure and combination of the above and a method for manufacturing a liquid crystal display element using a flexographic printing plate manufactured by such a manufacturing method.

In the present invention, a plurality of sheet-like divided bodies that are the basis of an ink transfer layer are sandwiched with a spacer having a fixed width in the surface direction on a pressure-sensitive adhesive surface arranged in a flat shape on a temporary fixing pressure-sensitive adhesive sheet. In the state of adhering in the state of adhering and temporarily fixing (first step),
A step of removing the temporary fixing pressure-sensitive adhesive sheet and the spacers after the reinforcing sheets covering the plurality of divided bodies are bonded to each other through the pressure-sensitive adhesive layer on the plurality of temporarily-fixed divided bodies (first step). Two steps),
A step (third step) of filling a photosensitive resin composition that undergoes a curing reaction by irradiation with actinic rays into a gap between the plurality of divided bodies from which the spacer has been removed; and the photosensitive resin composition filled in the gap. A step of forming the ink transfer layer by integrating the plurality of divided bodies with the cured product of the photosensitive resin composition by causing a curing reaction by irradiation of the actinic ray (fourth step). ,
Is a method for producing a flexographic printing plate comprising

  Moreover, this invention is a manufacturing method of the liquid crystal display element including the process of forming a liquid crystal aligning film by flexographic printing using the flexographic printing plate manufactured by the manufacturing method of the said invention.

  According to the present invention, as described above, a plurality of divided bodies are placed adjacent to each other on the adhesive surface of the adhesive sheet for temporary fixing arranged in advance in a plane, with a spacer having a certain width in the surface direction. The positional relationship between the respective divided bodies can be determined simply by temporarily fixing in the state. Such work is not a complicated work that requires micron-order position accuracy and does not allow slight deviations, as in the conventional alignment using marks and sheets. Just complete it. Therefore, it is possible to greatly reduce the labor of the work compared to the conventional alignment.

  Therefore, according to the present invention, a flexographic printing plate which is excellent in overall thickness accuracy even in a large size such as G6 or more and also excellent in positional accuracy of a pattern formed on a printing surface is divided into The body structure and combination can be further simplified and manufactured with high yield.

  Moreover, according to this invention, the liquid crystal display element provided with the large-sized and uniform thickness liquid crystal aligning film can be manufactured using the flexographic printing plate manufactured by the said manufacturing method.

It is a perspective view explaining a 1st process among each process of a 1st embodiment of a manufacturing method of a flexographic printing plate of the present invention. 2A and 2B are enlarged sectional views for explaining the second step. 3A, 3B, and 3C are enlarged cross-sectional views for explaining the third to fourth steps. It is a perspective view which shows the plate sheet of the state which the 4th process was complete | finished. It is a perspective view which shows an example of the flexographic printing plate finally manufactured through each process of said 1st embodiment. In 2nd embodiment of the manufacturing method of this invention, it is a perspective view which shows the plate sheet of the state which the 4th process was complete | finished. It is an expanded sectional view of the side surface vicinity of the division body used by 3rd embodiment of the manufacturing method of this invention. It is an expanded sectional view explaining the process of cutting the sheet-like precursor used as the basis of the said division body diagonally with respect to the thickness direction of the said precursor, and producing the said division body. FIG. 9A is an enlarged cross-sectional view for explaining the second step among the steps of the third embodiment using the divided body, and FIG. 9B is an enlarged cross-sectional view showing a state in which the fourth step is finished.

《Flexographic printing plate》
Referring to FIG. 5, a flexographic printing plate 1 manufactured by a manufacturing method according to an embodiment of the present invention described below includes a plurality of (four in the figure) rectangular sheets of the same size on a reinforcing sheet 2. In the state in which the divided bodies 4 are adjacent to each other in the plane direction and arranged in 2 rows × 2 columns, a rectangular flat plate shape formed by integrating the divided bodies 4 with the cured product 5 of the photosensitive resin composition. An ink transfer layer 6 is provided.

  The cured product 5 is formed by irradiating a photosensitive resin composition with an actinic ray such as an ultraviolet ray to cause a curing reaction.

Further, although the printing surface 7 which is the exposed surface of the ink transfer layer 6 is partially omitted in the drawing, the patterns P _{11 to} P _xy corresponding to x × y printing patterns are The ink transfer layers 6 are arranged in a matrix corresponding to the rectangles.

  Further, there are constants for holding the flexographic printing plate 1 with a vise (not shown) when the flexographic printing plate 1 is set on the flexographic printing machine in the vicinity of the two parallel sides of the rectangle of the flexographic printing plate 1 and outside the printing surface 7. A width gripping portion 61 is provided over the entire width of each side.

  A groove 62 having a constant width is provided between the grip 61 and the printing surface 7 in parallel with the grip 61.

  Further, the grip portion 61 has pin holes 63 for inserting fixing pins (not shown) at a plurality of locations (10 locations in the figure) in the length direction while gripping the grip portion 61 with a vise. It is formed at intervals.

  In order to manufacture the flexographic printing plate 1 by the manufacturing method according to the embodiment of the present invention, the divided body 4 is prepared.

  As the divided body 4, for example, a pattern that has not been previously patterned may be used, and a pattern may be formed later on the printing surface 7 of the ink transfer layer 6 formed by joining the divided bodies 4 together. Alternatively, the divided body 4 in which a pattern is formed in advance may be used.

<Production method of flexographic printing plate>
<First embodiment>
In 1st embodiment, the division body 4 which is not pattern-formed beforehand is used.

  With reference to FIG. 2A, FIG. 2B, etc., as this division body 4, the laminated body of the surface layer resin layer 8 which comprises the said printing surface 7, and the reinforcement film 9, etc. are mentioned, for example. The divided body 4 having such a laminated structure can be produced in the same manner as a conventional small flexographic printing plate.

  That is, a planar shaped surface (not shown) for making the printed surface 7 a predetermined surface state such as a rough surface is prepared, and a surface layer resin layer is provided between the shaped surface and the reinforcing film 9. 8 is irradiated with actinic rays in a state where the reinforcing film 9 is held in a parallel plate shape at a predetermined interval with respect to the shaping surface. The resin composition 8 is cured to form the surface resin layer 8. Thereafter, when the formed surface resin layer 8 is released from the shaping surface, the divided body 4 is produced.

  Such a divided body 4 is manufactured to a size that can be obtained with a conventional technique having excellent thickness accuracy, for example, less than G6, and the required number of sheets (in accordance with the size of the surface resin layer 8 of the flexographic printing plate 1) Prepare 4 sheets in the case of the figure).

  The photosensitive resin composition that is the basis of the surface resin layer 8 is the same as the photosensitive resin composition that is the basis of the cured product 5 described above for integrating a plurality of divided bodies 4, or It is preferable to select and use another photosensitive resin composition having excellent affinity.

  Examples of the photosensitive resin composition include a prepolymer having a 1,2-butadiene structure and having an ethylenically unsaturated double bond at the terminal, an ethylenically unsaturated monomer, and a photopolymerization initiator. Is mentioned.

  As the reinforcing film 9, for example, a thermoplastic resin such as polyethylene (PE), polypropylene (PP), thermoplastic polyurethane (TPU), polyethylene terephthalate (PET), tetrafluoroethylene / hexafluoropropylene copolymer (FEP), and the like. The film which becomes is mentioned.

(First step)
Referring to FIGS. 1 and 2A, a temporary fixing pressure-sensitive adhesive sheet 11 having a pressure-sensitive adhesive surface 10 on one side is disposed so that the pressure-sensitive adhesive surface 10 is flat, and the divided body 4 is disposed thereon. Bonding in a state of adjoining each other in the surface direction with a belt-like spacer 13 having a constant width (for example, about 3 mm) sandwiched between the surface 12 on the surface resin layer 8 side to be the printing surface 7 and the adhesive surface 10 Temporarily fix.

  That is, as shown by a broken line in FIG. 1, the divided body 4 is placed on the adhesive surface 10 so that the one surface 12 is in contact with the adhesive surface 10 while the side surface 14 of the divided body 4 is in contact with the side surface 15 of the spacer 13 over the entire length. When the pasting operation is repeated, the adjacent divided bodies 4 are temporarily fixed on the pressure-sensitive adhesive surface 10 with the spacers 13 interposed therebetween in the surface direction.

(Second step)
With reference to FIG. 2A and FIG. 2B, the plurality of divided bodies 4 on the exposed surface (opposite surface 16) on the reinforcing film 9 side of the plurality of divided bodies 4 temporarily fixed on the adhesive surface 10. After the one reinforcing sheet 2 is pasted through the adhesive layer 17, the adhesive sheet 11 for temporary fixing and the spacer 13 are removed by turning upside down.

  As the reinforcing sheet 2, for example, a laminate of the adhesive layer 17 and the reinforcing film 18 is used.

  Moreover, it is preferable to use what consists of a composition which carries out a hardening reaction by irradiation of actinic light with the said photosensitive resin composition 20 as the adhesion layer 17. FIG.

  As the adhesive layer 17, for example, when the photosensitive resin composition 20 has the above-described composition, a composition in which a prepolymer having an ethylenically unsaturated double bond, an ethylenically unsaturated monomer, or the like is blended in the component is used. Can be mentioned.

  When the pressure-sensitive adhesive layer 17 is used, the pressure-sensitive adhesive layer 17 and the cured product 5 of the photosensitive resin composition 20 can be more firmly integrated by irradiation with actinic rays. The effect can be improved and the durability of the flexographic printing plate 1 can be improved.

  For example, in the conventional example described in Patent Document 1, there is a possibility that cracks and separation may occur at the joints between the divided bodies by printing about 5000 to 18000 sheets, but the reinforcing sheet 2 having the adhesive layer 17 having the above function is used. When used, durability can be improved without cracking or peeling even after printing 20000 sheets.

  The reinforcing film 18 constituting the reinforcing sheet 2 together with the adhesive layer 17 is made of the same thermoplastic resin as the reinforcing film 9 described above, and has a thickness of 188 μm in consideration of the reinforcing effect and the total thickness of the flexographic printing plate 1. As described above, a film of about 350 μm or less is used.

  Any conventionally known general-purpose laminator or the like can be used for laminating the reinforcing sheet 2. In particular, a biaxial drive type pair roll laminator having both upper and lower rolls is most suitable. When such a laminator is used, the deviation in the surface direction of each layer can be minimized.

(Third process)
2B and 3A, after the photosensitive resin composition 20 is filled in the gaps 19 between the divided bodies 4 from which the spacers 13 have been removed, the photosensitive resin composition 20 is allowed to have actinic light transmittance. It is covered with a film 21 such as PE or PP.

  The film 21 may cover the plurality of divided bodies 4 arranged on one side 3 of the reinforcing sheet 2 over the entire surface, or the gap 19 filled with the photosensitive resin composition 20 of the divided bodies 4. And only its vicinity may be covered.

(Fourth process)
Referring to FIGS. 3B and 3C, an actinic ray such as ultraviolet rays is irradiated through the film 21 to cure the photosensitive resin composition 20 as indicated by solid arrows in the figure, and then the film 21 is cured. To peel off.

  Then, as shown in FIGS. 3C and 4, the ink transfer layer 6 in which the adjacent divided bodies 4 are integrated with the cured product 5 of the photosensitive resin composition 20 is formed, and the plate sheet 1 </ b> A is manufactured.

  Moreover, since the photosensitive resin composition 20 is cured and reacted with the film 21 covered as described above, the surface exposed to the printing surface 7 of the cured product 5 is the printing surface 7 as shown in FIG. 3C. The surface accuracy of the printed surface 7 can be improved without requiring a subsequent polishing step or the like.

  Moreover, since the tackiness of the photosensitive resin composition 20 can be suppressed by covering the film with the film 21 to cause the photosensitive resin composition 20 to undergo a curing reaction, the cleaning step of wiping off the dirt generated by the tack can be omitted. .

Thereafter, the reinforcing sheet 2 protruding outside the ink transfer layer 6 is cut from the plate sheet 1A in FIG. 4 to adjust the overall planar shape to a rectangle, and the ink transfer layer 6 in the vicinity of two sides parallel to each other is formed. , for example, the grip portion 61 by laser machining or the like, to form a groove 62 and pin holes 63, further to form a predetermined pattern P ₁₁ to P _xy on the printing surface 7, a flexographic printing plate 1 shown in FIG. 5 is completed.

  According to the flexographic printing plate 1 manufactured through the above steps, as described above, the printing surface 7 of the ink transfer layer 6 formed by integrally joining the divided bodies 4 that are not formed with the pattern is For example, in the conventional example described in Patent Document 1, the accuracy in the x direction is ± 1.2 mm and the accuracy in the y direction is about ± 0.9 mm on the same size printing surface 7. In either direction, the positional accuracy of the pattern can be greatly improved by setting it to about ± 100 μm.

<Second embodiment>
In the second embodiment of the present invention, the divided body 4 that is patterned in advance is used. Other steps are the same as in the first embodiment.

For example, a part of the surface of the surface layer resin layer 8 to be the printing surface 7 of each divided body 4 that is a laminate of the surface resin layer 8 and the reinforcing film 9 constituting the printing surface 7 is omitted in FIG. As described above, predetermined patterns P _{11 to} P _{> xy} corresponding to the x × y print patterns are formed in advance, and then the same as in the first embodiment, and FIG. 2A and FIG. 2B. The plate sheet 1B shown in FIG. 6 is produced through the steps of FIGS. 3A to 3C.

  Thereafter, the reinforcing sheet 2 that protrudes outside the ink transfer layer 6 is cut from the plate sheet 1B to adjust the overall planar shape to a rectangle, and the ink transfer layer 6 in the vicinity of the two sides parallel to each other is, for example, a laser. When the gripping part 61, the groove part 62, and the pin hole 63 are formed by processing or the like, the flexographic printing plate 1 shown in FIG. 5 is completed.

  In the second embodiment, for example, by increasing the dimensional accuracy in the surface direction of the divided body and the accuracy of the thickness of the spacer, the overall positional accuracy of the flexographic printing plate is at a high level comparable to that of the first embodiment. Can be maintained.

<Third embodiment>
Referring to FIG. 7, in the third embodiment of the present invention, a divided body 4 in which a side surface 14 facing an adjacent divided body (not shown) is inclined is used.

  The divided body 4 itself is a laminate of the surface resin layer 8 and the reinforcing film 9 similar to the one used in the first embodiment, and the side surface 14 of the divided body 4 is more than the one surface 12 on the surface resin layer 8 side. The inclined surface is inclined at a predetermined inclination angle θ such that the opposite surface 16 on the side protrudes outward in the surface direction.

  The divided body 4 is formed by cutting a sheet-like precursor as a base thereof obliquely with respect to the thickness direction of the precursor.

  For example, referring to FIG. 8, bases 24 and 25 having mounting surfaces 22 and 23 on the same plane are prepared, and a spacer having a constant thickness T is provided on the mounting surface 22 of one base 24. 26, the main body 28 of the precursor 27, which becomes the divided body 4, is placed so that the reinforcing film 9 side is in contact therewith, and is fixed by fixing means (not shown).

  At the same time, an outer edge portion 29 to be cut by the precursor 27 is placed on the placement surface 23 of the base plate 25 and fixed by fixing means (not shown), whereby the outer edge of the main body portion 28 of the precursor 27 is placed. The vicinity of the portion is in a state of being inclined at a predetermined inclination angle θ with respect to the placement surfaces 22 and 23 described above.

  In this state, when the outer edge portion of the inclined main body portion 28 of the precursor 27 is cut in a direction orthogonal to the mounting surfaces 22 and 23 at a predetermined cutting position indicated by a broken line in the drawing, FIG. As shown, the cut side surface 14 is an inclined surface inclined at the inclination angle θ.

  The inclination angle θ can be adjusted by changing the thickness T of the spacer 26. That is, the tilt angle θ can be increased as the spacer 26 having a larger thickness T is used.

  As a method for cutting the precursor 27, any of various cutting methods for cutting a sheet can be employed.

  However, the rotary cut method and the guillotine cut method are preferably employed.

  Since these cutting methods have a good finish on the cut surface (side surface 14), it is not necessary to apply oil or the like for improving the finish to the blade used for cutting.

  Therefore, there is no possibility that the oil remains on the cut surface and the good adhesion between the divided body 4 and the cured product 5 of the photosensitive resin composition 20 is not disturbed, and the oil is washed with a solvent such as acetone or ethanol. There is an advantage that the step of removing can be omitted.

  With reference to FIG. 9A, the necessary number of the divided bodies 4 are prepared, and after passing through a first step similar to that of the first embodiment, each side surface 14 is provided on the reinforcing sheet 2 with a gap 19 therebetween. In a state of being sandwiched and facing each other, they are bonded and fixed via the adhesive layer 17.

  Then, the gap 19 has an inverted trapezoidal cross-sectional shape in which the width of the opening on the printing surface 7 side is wider than the width of the bottom surface on the adhesive layer 17 side.

  In the first step, in order to align the adjacent divided bodies 4, for example, if the side surface 15 is an inclined surface corresponding to the side surface 14 and the spacer 13 or the like having a trapezoidal cross section is used. Good.

  Referring to FIG. 9B, the photosensitive resin composition 20 is filled in the gap 19, and the adjacent divided bodies 4 are cured by the photosensitive resin composition 20 through the second to fourth steps described above. An ink transfer layer 6 integrated with the object 5 is formed.

  Note that the surface of the surface resin layer 8 to be the printing surface 7 may not be patterned in advance as in the first embodiment, or may be patterned in advance as in the second embodiment. .

  In the case of the former, in order to form a pattern later on the printing surface 7 of the ink transfer layer 6 formed by joining together the divided bodies 4 that are not patterned, the overall positional accuracy of the flexographic printing plate is It can be maintained at a high level comparable to that of the first embodiment.

  In the latter case, for example, by increasing the dimensional accuracy in the surface direction of the divided body and the accuracy of the spacer thickness, the overall positional accuracy of the flexographic printing plate is also at a high level comparable to that of the first embodiment. Can be maintained.

  As described above, when the side surface 14 of the divided body 4 is an inclined surface, thereby forming the gap 19 in an inverted trapezoidal shape with a wide opening on the printing surface 7 side, the photosensitive resin composition 20 is placed in the gap 19. In addition, it is possible to suppress the entrapment of bubbles in order from the bottom surface on the adhesive layer 17 side, and it is possible to prevent the bubbles that are the starting point of breakage from remaining in the cured product 5 as much as possible.

  Moreover, even if the entrapment of bubbles occurs, it is possible to improve workability when removing the photosensitive resin composition 20 before irradiating it with an actinic ray to cause a curing reaction.

  Furthermore, the appearance can be improved by suppressing or removing the entrapment of bubbles.

  Therefore, with the side surface 14 as an inclined surface, the cured product 5 is combined with the fact that the contact area between the divided body 4 and the cured product 5 of the photosensitive resin composition 20 filled in the gap 19 between the adjacent divided bodies 4 can be increased. The durability of the flexographic printing plate 1 can be improved by increasing the strength of integration between the adjacent divided bodies 4 interposed therebetween.

  For example, even when the side surface 14 is not an inclined surface, cracks and peeling do not occur even when printing 20000 sheets as described above, and the durability can be improved as compared with the conventional example, but when the inclined surface is used, about 40000 sheets are obtained. Even if it prints, a crack and peeling do not arise and durability can be improved further significantly.

  Although the inclination angle θ of the side surface 14 can be arbitrarily set, it is preferably 10 ° or more, particularly 20 ° or more, and preferably 60 ° or less, particularly 45 ° or less.

  When the inclination angle θ is less than the above range, the above-described effect due to the side surface 14 being an inclined surface may not be sufficiently obtained.

  On the other hand, when the angle of inclination exceeds the above range, the angle formed between the blade used for cutting and the precursor 27 becomes too small, and the workability of cutting may be reduced.

  For this reason, even if the above-described rotary cut method, guillotine cut method, or the like is employed, the cut surface may be partially broken or the smoothness of the cut surface may be reduced, resulting in a reduction in the finish.

<< Method for manufacturing liquid crystal display element >>
This invention is a manufacturing method of the liquid crystal display element including the process of forming a liquid crystal aligning film by flexographic printing using the flexographic printing plate manufactured with the manufacturing method of the said invention.

  According to the present invention, since the printing surface of the flexographic printing plate can be made to follow the unevenness correspondingly to the miniaturization of the unevenness of the surface of the substrate, a liquid crystal alignment film having a uniform thickness and no pinholes can be obtained. The provided liquid crystal display element can be manufactured.

  Other steps of the production method of the present invention can be carried out in the same manner as in the prior art.

  That is, a transparent electrode layer corresponding to a predetermined matrix pattern or the like is formed on the surface of a transparent substrate such as a glass substrate, and a liquid crystal alignment film is formed by flexographic printing using the flexographic printing plate. The substrate is prepared by subjecting the surface to orientation treatment by rubbing or the like as necessary.

  Next, two substrates are prepared, and in a state where the respective transparent electrode layers are aligned, a liquid crystal material is sandwiched between them and fixed together to form a laminated body. A liquid crystal display element is manufactured by disposing a polarizing plate on the outside.

  The configuration of the present invention is not limited to the example of the figure described above.

  For example, the divided body 4 constituting the ink transfer layer 6 may be two or three, or may be five or more. The divided bodies 4 may be formed in different shapes and sizes depending on which position of the ink transfer layer 6 is formed, instead of the same shape and size. However, in consideration of saving the time and labor of the combination, it is preferable to use a combination of two or more divided bodies 4 having the same shape and the same size.

  In addition, various design changes can be made without departing from the scope of the present invention.

<Example 1>
(Preparation of model of divided body 4)
As the photosensitive resin composition that is the basis of the surface resin layer 8, a urethane prepolymer having an 1,2-butadiene structure and having an ethylenically unsaturated double bond at the terminal, an ethylenically unsaturated monomer, And a composition [NK resin manufactured by Sumitomo Rubber Industries, Ltd.] containing a photopolymerization initiator.

  The photosensitive resin composition was sandwiched between the mold surface and the PET reinforcing film 9 and irradiated with ultraviolet rays having a wavelength of 365 nm for 15 minutes to cure the photosensitive resin composition to form the surface resin layer 8. After that, the precursor 27 which is a laminate of the surface resin layer 8 and the reinforcing film 9 was cut out and used as a model of the divided body 4. The thickness of the surface resin layer 8 was 2.4 mm.

  In addition, when the model of the divided body 4 is cut out, the side surface 14 facing the adjacent divided body is not inclined (inclination angle 0 °, Example 1-1), and the method described in FIG. What prepared the inclined surface of angle 10 degrees (Example 1-2), 30 degrees (Example 1-3), 45 degrees (Example 1-4), and 60 degrees (Example 1-5) was prepared. .

  Moreover, the following criteria evaluated the quality of the workability of the cut in the said cutout.

  Bad (B): The workability of cutting out the precursor 27 was poor, and a partial breakage and a decrease in smoothness were observed on the cut surface.

  Nomal (N): The workability of cutting out the precursor was better than the above “Bad” and worse than the following “Good”. Moreover, although the partial cut | disconnection and the fall of smoothness were slightly seen on the cut surface, it was a practical use level.

  Good (G): The workability of cutting out the precursor 27 was better than the above “Nomal” and worse than the following “Excellent”. Further, the cut surface had no partial breakage or smoothness deterioration, and the finish was good.

  Excellent (E): The precursor 27 could be cut out with extremely good workability. Further, the cut surface had no partial breakage or smoothness deterioration, and the finish was good.

(Manufacturing the model of flexographic printing plate 1)
A model of the flexographic printing plate 1 was manufactured by joining the two divided bodies 4 in accordance with the above-described procedure shown in FIGS. 1A to 3.

  As the divided bodies, two pieces having the same side surface inclination angle θ were combined.

  As the photosensitive resin composition 20 for joining the divided bodies 4, the above composition [NK resin manufactured by Sumitomo Rubber Industries, Ltd.] was used. Further, as the reinforcing sheet 2, a sheet in which an adhesive layer 17 was laminated on one side of a PET reinforcing film was used.

  And in the state which filled the said photosensitive resin composition 20 in the clearance gap 19 and was covered with the film 21 made from PP, the ultraviolet-ray with a wavelength of 365 nm was irradiated for 15 minutes, and it was made to cure-react, and the division body 4 was made into the said photosensitive resin composition. The cured product 5 of the product 20 was joined.

<Bubble biting>
It was observed whether or not bubbles were caught in the cured product 5 of the photosensitive resin composition 20 connecting the two divided bodies 4 of the manufactured flexographic printing plate model.

<Tensile property test>
The manufactured flexographic printing plate model is cured at room temperature for 18 hours, and then the reinforcing film is peeled off using a ham slicer. The test piece was punched out in the shape of the prescribed dumbbell-shaped No. 3 test piece and so that the seam between the divided bodies 4 was positioned so as to cross the parallel part.

  And the maximum tensile force (N) recorded when it pulled until it cut | disconnected according to the measuring method described in the said specification in room temperature environment was calculated | required.

  Since air bubbles were confirmed in Example 1-1, a model in which the air bubbles were removed after filling with the photosensitive resin composition 20 was prepared as (no air bubbles) and subjected to a tensile test.

<Comprehensive judgment>
The general evaluation was performed according to the following criteria, with no air bubbles in Example 1-1 as standard (C).

  Bad (B): The tensile force was less than 0.8 times the standard, or the cutting workability was B.

  Nomal (N): The tensile force was 0.8 times or more and less than 1 time of the standard, and the workability of cutting was G or E.

  Good (G): The tensile force was 1 time or more and less than 1.1 times the standard, and the workability of cutting was G or E. Or the tensile force was 1.1 times or more of the standard, and the cutting workability was N.

  Excellent (E): The tensile force was 1.1 times or more of the standard, and the workability of cutting was G or E.

  The results are shown in Table 1.

  From the results of Example 1-1 in Table 1, it was found that when the side surface 14 is not inclined, bubbles tend to remain, but the tensile properties can be improved by removing the bubbles.

  Moreover, from the results of Examples 1-2 to 1-5, it was found that by making the side surface 14 an inclined surface, it is difficult for bubbles to remain and the tensile characteristics can be further improved.

  Further, from the results of Examples 1-2 to 1-5, the inclination angle θ of the side surface 14 is preferably 10 ° or more, particularly preferably 20 ° or more in consideration of further improving the tensile properties. In consideration of improving workability, it was found that the angle is preferably 60 ° or less, particularly 45 ° or less.

DESCRIPTION OF SYMBOLS 1 Flexographic printing plate 1A, 1B Plate sheet 2 Reinforcement sheet 3 Single side 4 Divided body 5 Cured material 6 Ink transfer layer 7 Printing surface 8 Surface resin layer 9 Reinforcement film 10 Adhesive surface 11 Adhesive sheet 12 Single side 13 Spacer 14 Side 15 Side 16 Opposite surface 17 adhesive layer 18 reinforcement film 19 gap 20 photosensitive resin composition 21 films 22, 23 mounting surface 24, 25 units Release 26 spacer 27 precursor 28 main body portion 29 outer portion 61 gripping portion 62 groove 63 pin holes _{P 11} ~ P _xy pattern θ Inclination angle

For example, a part of the surface of the surface layer resin layer 8 to be the printing surface 7 of each divided body 4 that is a laminate of the surface resin layer 8 and the reinforcing film 9 constituting the printing surface 7 is omitted in FIG. As described above, predetermined patterns P ₁₁ to P _xy corresponding to x × y print patterns are formed in advance, and then the same as in the first embodiment, FIG. 2A, FIG. 2B, The plate sheet 1B shown in FIG. 6 is produced through the steps of FIGS. 3A to 3C.

Normal (N): The workability of cutting out the precursor was better than the above “Bad” and worse than the following “Good”. Moreover, although the partial cut | disconnection and the fall of smoothness were slightly seen on the cut surface, it was a practical use level.

Good (G): The workability of cutting out the precursor 27 was better than the above “ Normal ” and worse than the “Excellent” below. Further, the cut surface had no partial breakage or smoothness deterioration, and the finish was good.

(Manufacturing the model of flexographic printing plate 1)
According to the procedure described above as shown in FIGS. 1 to 3, by joining the two split body 4, to produce a model of the flexographic printing plate 1.

Normal (N): The tensile force was 0.8 times or more and less than 1 time of the standard, and the workability of cutting was G or E.

Claims (8)

A plurality of sheet-like divided bodies that are the basis of the ink transfer layer were placed adjacent to each other on a flat adhesive surface of the adhesive sheet for temporary fixing with a spacer having a certain width in the surface direction. A process of pasting and temporarily fixing in a state,
The step of removing the temporary fixing adhesive sheet and the spacer after bonding the reinforcing sheet over the plurality of divided bodies to each other through the adhesive layer on the temporarily divided pieces.
A step of filling a photosensitive resin composition that undergoes a curing reaction by irradiation of actinic rays into a gap between the plurality of divided bodies from which the spacer has been removed; and the photosensitive resin composition that is filled in the gap. A step of forming the ink transfer layer by integrating the plurality of divided bodies with a cured product of the photosensitive resin composition by performing a curing reaction by irradiation of light;
A method for producing a flexographic printing plate comprising   The said adhesive layer is a manufacturing method of the flexographic printing plate of Claim 1 which consists of a composition which carries out hardening reaction by irradiation of the said actinic light with the said photosensitive resin composition.   The method of manufacturing a flexographic printing plate according to claim 1, wherein the divided body has an inclined surface in which a side surface facing an adjacent divided body is inclined with respect to a thickness direction.   The inclined surface is formed by cutting a sheet-like precursor that is a basis of the divided body obliquely with respect to the thickness direction of the precursor by a rotary cut method or a guillotine cut method. 4. A method for producing a flexographic printing plate according to item 3.   After the photosensitive resin composition filled in the gap is covered with the film having the actinic ray permeability, the actinic ray is irradiated through the film to cure the photosensitive resin composition. The manufacturing method of the flexographic printing plate of any one of Claims 1-4 which peels the said film.   The method for producing a flexographic printing plate according to any one of claims 1 to 5, further comprising a step of patterning a printing surface of the formed flexographic printing plate in correspondence with a predetermined printing pattern.   The method for producing a flexographic printing plate according to any one of claims 1 to 5, wherein a divided body that is patterned in advance corresponding to a predetermined printing pattern is used.   The manufacturing method of a liquid crystal display element including the process of forming a liquid crystal aligning film by flexographic printing using the flexographic printing plate manufactured by the manufacturing method of any one of the said Claims 1-7.

Images