KR20170040118A - Flexographic printing plate manufacturing method and liquid crystal display element manufacturing method - Google Patents

Abstract

[PROBLEMS] To provide a manufacturing method capable of manufacturing a flexographic printing plate excellent in thickness accuracy even in a large size and excellent in positional accuracy of a pattern to be formed with a high yield by simplifying the structure and combination of the divisional bodies on which the flexographic printing plate is based, A method for manufacturing a liquid crystal display element using a flexographic printing plate manufactured by the method is provided.
A method of manufacturing a flexographic printing plate includes a step of stacking a plurality of divided bodies (4) on an adhesive surface (10) of a pressure sensitive adhesive sheet (11) with a spacer (13) interposed therebetween, 2) are adhered to each other to remove the adhesive sheet 11 and the spacers 13 and the photosensitive resin composition is filled in the gap from which the spacers 13 have been removed and irradiated with an actinic ray to cause a curing reaction, . A manufacturing method of a liquid crystal display element includes a step of forming a liquid crystal alignment layer by flexographic printing using such a flexographic printing plate.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a liquid crystal display element,

The present invention relates to a method for producing a flexographic printing plate used for forming a liquid crystal alignment film or the like of a liquid crystal display element and a method for manufacturing a liquid crystal display element using the flexographic printing plate produced by such a manufacturing method.

In order to form a liquid crystal alignment film which is required to have a high coating film quality on the electrode formation surface of the substrate constituting the liquid crystal display element and which is as thin as possible and free from pinholes or the like and is thin, Is used.

The flexographic printing plate used for flexographic printing generally has an ink transfer layer having a printing surface on one side for holding ink at the time of printing. Further, a reinforcing sheet made of various plastics or the like is usually laminated on the surface opposite to the printing surface of the ink transfer layer.

The flexographic printing plate is required to have as high a thickness accuracy as possible throughout the entire surface in order to maintain a constant pressure and to improve printing accuracy to form a liquid crystal alignment film having a uniform thickness. Especially in recent years, it has been required to increase the thickness accuracy to ± 15 μm, which was ± 30 μm in the past.

However, there is a problem that it is difficult to maintain the above-mentioned thickness accuracy with the enlargement of the flexographic printing plate due to the recent enlargement of the liquid crystal display element. In particular, in a large-sized flexographic printing plate such as a G6 size (1560 mm × 2065 mm) to a G8 size (2300 mm × 2780 mm), the reduction in thickness accuracy is remarkable.

Thus, a plurality of sheet-shaped divided bodies serving as the basis of at least the ink transfer layer of the flexographic printing plate are manufactured, and the printed surfaces of the respective divided bodies are patterned in advance in correspondence with a predetermined printing pattern, It has been studied to produce a flexographic printing plate (Patent Document 1).

According to this manufacturing method, the individual divided bodies can be formed in a smaller size that facilitates the improvement of the thickness accuracy, so that the overall thickness precision of the flexographic printing plate can be improved.

Japanese Laid-Open Patent Publication No. 2009-83112

It is not easy to connect the divided bodies to each other so that the pattern formed on the printed surface of each of the divided bodies is arranged in the positional accuracy of the micron order in the plane direction between the divided bodies.

Therefore, in the invention described in Patent Document 1, attention is paid to improving the precision of the butt joint and the positional accuracy of the pattern by using the positioning-use sheet together with the marks for positioning in the divided bodies.

However, it is not easy to align the plurality of divided bodies with each other using the mark and the sheet for alignment, and it takes time for the butt connection.

According to the inventor's investigation, when the reinforcement sheet is finally attached to the entire surface of the plurality of divided bodies which are butt-connected, the resin charged in the butt joint is extended in the surface direction by the stress applied to the divided body And defects in which the positional accuracy of the pattern is lowered frequently occur.

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

In the invention described in Patent Document 1, the divided bodies are bonded to each other only by a polymerizable resin at their end faces. In order to prevent the divided body from bending during the polymerization shrinking of such a resin, . Therefore, the structure of the individual divided bodies is complicated, and there is also a problem that the combination of the divided bodies becomes complicated.

An object of the present invention is to provide a flexographic printing plate which is excellent in overall thickness accuracy even in the case of a large size such as G6 or more and excellent in positional accuracy of a pattern to be formed on a printing surface, , And a method for producing a liquid crystal display element using the flexographic printing plate manufactured by such a manufacturing method.

The present invention is characterized in that a plurality of sheet-shaped divided bodies serving as the base of the ink transfer layer are placed adjacent to each other on a sticky surface of a temporary fixing adhesive sheet arranged in a plane with a spacer (The first step), and the step

(Second step) of removing the temporary fixing adhesive sheet and the spacer after the reinforcing sheet covering the plurality of divided bodies is temporarily bonded to the plurality of divided bodies temporarily fixed with the adhesive layer interposed therebetween, ,

A step (third step) of charging a photosensitive resin composition which undergoes a curing reaction by irradiation of an actinic ray, onto a gap between the plurality of divided bodies, from which spacers have been removed, and

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 the photosensitive resin composition filled in the gap to cure by irradiation of the actinic ray, 4). ≪ / RTI >

Further, the present invention is a method for producing a liquid crystal display element comprising a step of forming a liquid crystal alignment film by flexographic printing using the flexographic printing plate produced by the above-mentioned production method of the present invention.

According to the present invention, as described above, the plurality of divided bodies are temporarily fixed on the adhered surface of the temporary fixing adhesive sheet, which are previously arranged in a plane, with the spacers spaced in the plane direction therebetween, The positional relationship between the divided bodies can be determined. Such an operation is not a troublesome operation in which positional accuracy of a micron order is required, such as positioning using a conventional mark and a sheet, and slight deviation is not allowed. Instead, the side surface of the divided body is brought into contact with only the side surface of the spacer . Therefore, the labor required for the operation can be greatly reduced as compared with the conventional alignment.

Therefore, according to the present invention, it is possible to provide a flexographic printing plate which is excellent in overall thickness accuracy even in a large size such as G6 or more and has excellent positional accuracy of a pattern to be formed on a printing surface, , And can be produced at a high yield.

According to the present invention, a liquid crystal display element having a liquid crystal alignment film which is large and uniform in thickness can be manufactured by using the flexographic printing plate produced by the above-mentioned manufacturing method.

1 is a perspective view explaining a first step of each step of the first embodiment, which is a method for producing a flexographic printing plate according to the present invention.
2A and 2B are enlarged cross-sectional views illustrating the second process.
3A, 3B and 3C are enlarged sectional views for explaining the third to fourth steps.
4 is a perspective view showing a plate sheet in a state where the fourth step is completed.
Fig. 5 is a perspective view showing an example of a flexographic printing plate finally produced through the respective steps of the first embodiment. Fig.
Fig. 6 is a perspective view showing a plate sheet in a state where the fourth step is completed, in the second embodiment of the production method of the present invention. Fig.
Fig. 7 is an enlarged cross-sectional view of the divided body used in the third embodiment of the production method of the present invention in the vicinity of the side face. Fig.
8 is an enlarged cross-sectional view for explaining a step of producing a divided body by cutting a sheet-like precursor serving as a base of the divided body obliquely with respect to the thickness direction of the precursor.
FIG. 9A is an enlarged cross-sectional view for explaining a second step of each step of the third embodiment using the divided body, and FIG. 9B is an enlarged cross-sectional view showing a state where the fourth step is completed.

<< Flexo printing >>

5, the flexographic printing plate 1 manufactured by the manufacturing method according to the embodiment of the present invention described below is provided with a plurality of (four in the drawing) Formed by integrating the divided bodies 4 with the cured product 5 of the photosensitive resin composition in a state in which the divided bodies 4 on the rectangular sheet side of the photosensitive resin composition are arranged in two rows and two columns in the surface direction, And an ink transfer layer 6 that is a flat plate.

The cured product (5) is formed by irradiating the photosensitive resin composition with an actinic ray such as ultraviolet ray and performing a curing reaction.

A part of the print surface 7, which is the surface on which the ink transfer layer 6 is exposed, is omitted in the drawing. The patterns P ₁₁ to P _xy corresponding to the x x y print patterns are printed Are arranged in a matrix in correspondence with the rectangle of the layer (6).

When the flexographic printing plate 1 is set on the flexographic printing plate 1 in the vicinity of two parallel sides of the square of the flexographic printing plate 1 and on the outside of the printing surface 7, A grip portion 61 having a constant width for gripping is formed over the entire width of each side.

A groove portion 62 having a predetermined width is formed between the grip portion 61 and the print surface 7 in parallel with the grip portion 61. [

The grip portion 61 is provided with a pin hole (not shown) for inserting a fixing pin (not shown) in a state where the grip portion 61 is held by a vise at a plurality of points 63 are formed at regular intervals.

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

As such a divided body 4, for example, one that has not been previously patterned is used, and a printed surface 7 of the ink transfer layer 6, which is formed by integrally butt-connecting the divided bodies 4, A pattern may be formed, or a divided body 4 in which a pattern is formed in advance may be used.

<< Manufacturing method of flexo printing plate >>

&Lt; First Embodiment >

In the first embodiment, a divided body 4 in which no pattern is formed in advance is used.

The divided body 4 may be a laminate of a surface layer resin layer 8 constituting the printing surface 7 and a reinforcing film 9, for example, with reference to Figs. 2A and 2B, have. The divided body 4 having such a laminated structure can be manufactured in the same manner as a conventional small-sized flexographic printing plate.

That is, a plane surface (not shown) for making the printing surface 7 have a predetermined surface state such as a roughened surface is prepared, and between the surface of the reinforcing film and the surface of the reinforcing film, The photosensitive resin composition as a base of the photosensitive resin composition 8 is placed in between and the reinforcing film 9 is irradiated with actinic light while being kept on a parallel plate at a predetermined distance from the surface of the reinforcing film 9, Is cured to form a surface resin layer (8). Thereafter, when the formed surface layer resin layer 8 is released from the mold surface, a divided body 4 is produced.

Such a divided body 4 can be manufactured in accordance with the size of the surface layer resin layer 8 of the flexographic printing plate 1, for example, Prepare for long life (four in the case of drawings).

The photosensitive resin composition on which the surface resin layer 8 is based may be the same as or similar to the photosensitive resin composition on which the cured product 5 described above is integrated for integrating a plurality of divided bodies 4, It is preferable to select and use another excellent photosensitive resin composition.

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

As the reinforcing film 9, for example, polyethylene (PE), polypropylene (PP), thermoplastic polyurethane (TPU), polyethylene terephthalate (PET), tetrafluoroethylene / hexafluoropropylene copolymer ), And the like.

(First step)

1 and 2A, a temporary fixing adhesive sheet 11 having a single-side adhesive surface 10 is formed in such a manner that the adhesive surface 10 is arranged in a plane, and the divided body 4 ) Of a predetermined width (for example, about 3 mm) such that the one side 12 on the side of the surface resin layer 8 to be the printing surface 7 comes into contact with the adhesive surface 10 In a state in which they are adjacent to each other in the plane direction.

1, while the side face 14 of the divided body 4 is brought into contact with the side face 15 of the spacer 13 over the entire length, the one face 12 is pressed against the adhesive surface 10 When the operation for attaching the divided body 4 to the adhesive surface 10 is repeated so that the adjoining divided bodies 4 are adjacent to each other in the plane direction with the spacer 13 interposed therebetween, Is temporarily fixed on the adhesive surface (10).

(Second Step)

2A and 2B, on the surface (opposite surface 16) on which the reinforcing film 9 side is exposed, of the plurality of divided bodies 4 temporarily fixed on the pressure-sensitive adhesive surface 10, One sheet of the reinforcing sheet 2 over the divided sheet 4 of the sheet is bonded via the adhesive layer 17 and then the upper and lower sides are reversed to remove the temporary fixing adhesive sheet 11 and the spacers 13 do.

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

As the adhesive layer 17, it is preferable to use a composition comprising a composition which reacts with the photosensitive resin composition 20 to cause a curing reaction by irradiation with an actinic ray.

As the adhesive layer 17, for example, in the case where the photosensitive resin composition 20 has the above-mentioned composition, a prepolymer having an ethylenically unsaturated double bond or an ethylenic unsaturated monomer is blended in the component have.

When the adhesive layer 17 is used, the adhesive layer 17 and the cured product 5 of the photosensitive resin composition 20 can be integrated more firmly by irradiation of actinic rays, and the reinforcing sheet 2 ) Of the flexographic printing plate 1 is 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 fear that cracks or peeling may occur at the joints between the divided bodies due to the printing of about 5000 to 18000 sheets. However, the adhesive layer 17 having the above- When the reinforcing sheet 2 is used, durability can be improved without cracking or peeling even when 20,000 sheets are printed.

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 the reinforcing effect and the flexibility of the flexographic printing plate 1), a film having a thickness of 188 탆 or more and 350 탆 or less is used.

For the bonding of the reinforcing sheet 2, any conventionally known general-purpose laminator can be used. In particular, a twin-roll type laminator of two-axis driving type having a driving force for both of the upper and lower rolls is optimum. By using such a laminator, it is possible to minimize the deviation in the plane direction of each layer.

(Third step)

The photosensitive resin composition 20 is filled in the gap 19 between the divided bodies 4 from which the spacers 13 have been removed and then the photosensitive resin composition 20 is irradiated with the active rays For example, a film 21 made of PE, PP or the like.

The film 21 may cover the entire surface of the divided piece 4 arranged on the one side 3 of the reinforcing sheet 2 and the photosensitive resin composition 20 of the divided piece 4, And only the vicinity thereof.

(Fourth step)

An active ray such as ultraviolet rays is irradiated through the film 21 as indicated by a solid arrow in the figure to cure the photosensitive resin composition 20 and then the film 21 ).

3C and Fig. 4, the ink transfer layer 6, in which the adjacent divided bodies 4 are integrated by the cured product 5 of the photosensitive resin composition 20, is formed, 1A).

3C, since the photosensitive resin composition 20 is cured in a state covered by the film 21 as described above, the cured product 5 is exposed on the surface 7 exposed to the printing surface 7, Can be made flush with the print surface 7, and the surface precision of the print surface 7 can be improved without requiring a subsequent polishing step or the like.

Further, when the photosensitive resin composition 20 is cured and covered with the film 21, the step of the photosensitive resin composition 20 can be suppressed, so that the cleaning step for wiping off the contamination caused by the jaws is omitted You may.

Thereafter, the reinforcing sheet 2, which is hollowed out to the outside of the ink transfer layer 6, is cut from the plate sheet 1A shown in Fig. 4 to form a square planar shape as a whole, a predetermined pattern of the ink transfer layer 6, for example, laser processing, etc. by the gripper 61, the groove 62 and the pin print further, by forming the opening 63 side (7) P ₁₁ ~ When P _xy is formed, the flexographic printing plate 1 shown in Fig. 5 is completed.

As described above, according to the flexographic printing plate 1 manufactured through the above-described process, the printing surface 7 of the ink transfer layer 6, which is formed by integrally butting together the divided bodies 4, For example, in the conventional example described in Patent Document 1, the accuracy in the x direction was about 1.2 mm and the accuracy in the y direction was about 0.9 mm on the printing surface 7 of the same size Of about 100 mu m in any direction, it is possible to remarkably improve the positional accuracy of the pattern.

&Lt; Second Embodiment >

In the second embodiment of the present invention, the patterned divided body 4 is used in advance. The other steps are the same as in the first embodiment.

For example, the surface layer resin layer 8, which is the printing surface 7, of each of the divided parts 4 as the lamination of the surface layer resin layer 8 and the reinforcing film 9 constituting the printing surface 7, 6, a predetermined pattern P ₁₁ to P _xy corresponding to x x y print patterns is formed first, and the rest are formed in the same manner as in the first embodiment, , Fig. 2B, and Figs. 3A to 3C, the plate sheet 1B shown in Fig. 6 is produced.

Thereafter, the reinforcing sheet 2, which is hollowed out to the outside of the ink transfer layer 6, is cut from the plate sheet 1B to rectify the entire planar shape into a quadrangle, When the transfer layer 6 is subjected to laser processing, for example, to form a grip portion 61, a groove portion 62, and a pin hole 63, the flexographic printing plate 1 shown in Fig. 5 is completed.

In the second embodiment, for example, by increasing the dimension accuracy of the divided body in the plane direction and the thickness precision of the spacer, the overall positional accuracy of the flexographic printing plate can be maintained at a level as high as that in the first embodiment have.

&Lt; Third Embodiment >

Referring to Fig. 7, in the third embodiment of the present invention, the divided body 4 having the side face 14 facing the adjacent divided body (not shown) is used as the inclined face.

The divided body 4 itself is a laminate of the surface layer resin layer 8 and the reinforcing film 9 which is the same as that used in the first embodiment and the side surface 14 thereof is formed as a laminate of the side surface resin layer 8, The inclined surface is inclined at a predetermined inclination angle? So that the opposite surface 16 of the reinforcing film 9 side protrudes outward in the surface direction than the surface 12 of the reinforcing film 9.

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

For example, with reference to Fig. 8, it is also possible to prepare planks 24, 25 having the same planar surfaces 22, 23 as the placement surfaces 22, 23, The body portion 28 of the precursor 27 serving as the divided body 4 is placed on the tooth surface 22 with the reinforcing film 9 side in contact with the spacer 27 via the spacer 26 having a constant thickness T , And fixed by a fixing means not shown.

The outer edge portion 29 on which the precursor 27 is cut is placed on the mounting surface 23 of the base 25 and is fixed by a fixing means not shown also, The vicinity of the outer edge portion of the main body portion 28 is tilted at a predetermined tilt angle? With respect to the placement surfaces 22,

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 placement surfaces 22 and 23 at a predetermined cut position indicated by a broken line in the figure, The cut side 14 becomes an inclined surface inclined at the inclination angle [theta].

The inclination angle [theta] can be adjusted by changing the thickness T of the spacer 26. [ That is, as the spacer 26 having a larger thickness T is used, the inclination angle? Can be increased.

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

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

Since the cut surface (side surface 14) is finishing well, it is not necessary to apply oil or the like for improving the finish to the blade used for the cut.

Therefore, there is no possibility that good adhesion between the divided body 4 and the cured product 5 of the photosensitive resin composition 20 is disturbed by oil on the cut surface, and the oil is washed with a solvent such as acetone or ethanol So that the step of removing can be omitted.

9A, the divided body 4 is prepared in the required length and subjected to the same first step as that of the first embodiment, so that the respective side faces 14 are formed on the reinforcing sheet 2, The adhesive layer 17 is interposed and fixed with the gap 19 facing each other with the adhesive layer 17 interposed therebetween.

Thus, the clearance 19 has an inverted trapezoidal cross sectional shape in which the width of the opening on the printing surface 7 side is larger than the width of the bottom surface on the adhesive layer 17 side.

In order to align the positions of the adjacent divided bodies 4 in the first step, for example, the side faces 15 are inclined surfaces corresponding to the side faces 14 and the cross-sectional shapes of the spacers 13 ) Can be used.

9B, the gap 19 is filled with the photosensitive resin composition 20, and the divided parts 4 adjacent to each other are subjected to the above-described second to fourth steps to form the photosensitive resin composition 20 The ink transfer layer 6 integrated with the cured product 5 is formed.

The surface of the surface layer resin layer 8 serving as the print surface 7 may not be patterned in advance in the same manner as in the first embodiment, or patterned in advance as in the second embodiment.

In the case of the former, in order to form a pattern on the printing surface 7 of the ink transfer layer 6 formed by integrally butting together the non-patterned divided bodies 4, the overall position of the flexographic printing plate The accuracy can be maintained at a high level equivalent to that of the first embodiment.

In the latter case, it is possible to maintain the overall positional accuracy of the flexographic printing plate at a level as high as that in the first embodiment, for example, by increasing the dimension accuracy of the divided body in the plane direction and the thickness precision of the spacer have.

When the side surface 14 of the divided body 4 is formed as an inclined surface and the clearance 19 is formed to have an inverted trapezoidal shape with a wide opening width on the printing surface 7 side as described above, And the photosensitive resin composition 20 are injected in order from the bottom surface on the side of the adhesive layer 17 in a favorable order in order to suppress the incorporation of bubbles and the bubbles to be the starting points of the fracture to remain in the cured product 5 As much as possible.

In addition, even when the incorporation of bubbles occurs, the workability in removing the photosensitive resin composition 20 before the curing reaction by irradiating an actinic ray can be improved.

Further, by suppressing or eliminating the incorporation of bubbles, the appearance can also be improved.

The side surface 14 is made to be an inclined surface so that the contact area with the cured product 5 of the photosensitive resin composition 20 filled in the gap 19 between the divided member 4 and the adjacent divided member 4 And the durability of the flexographic printing plate 1 can be improved by increasing the integrated strength of the adjacent divided parts 4 via the cured product 5. [

For example, even when the side surface 14 is not an inclined surface, the durability can be improved as compared with the conventional example without causing cracking or peeling even when 20,000 sheets are printed as described above. However, The durability can be further greatly improved without causing sea cracking or peeling.

The inclination angle &amp;thetas; of the side surface 14 can be set arbitrarily, but it is preferably not less than 10 degrees, particularly not less than 20 degrees, more preferably not more than 60 degrees, particularly not more than 45 degrees.

When the inclination angle &amp;thetas; is less than the above-mentioned range, there is a possibility that the above-described effect due to the inclined side surface 14 may not be sufficiently obtained.

On the other hand, when the inclination angle exceeds the above range, the angle formed by the blade used for the cut and the precursor 27 becomes excessively small, and the workability of the cut may be deteriorated.

For this reason, even if the above-described rotary cutting method, guillotine cutting method, or the like is employed, there is a possibility that a partial fracture occurs on the cut surface or the smoothness of the cut surface is lowered and the finish is lowered.

<< Manufacturing Method of Liquid Crystal Display Element >>

The present invention is a method for producing a liquid crystal display element comprising a step of forming a liquid crystal alignment film by flexographic printing using the flexographic printing plate produced by the production method of the present invention.

According to the present invention, since the printed surface of the flexographic printing plate can be well followed to the concavities and convexities corresponding to the fine irregularities of the surface of the substrate, a liquid crystal display element having a uniform thickness and a pinhole- can do.

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

That is, after a transparent electrode layer corresponding to a predetermined matrix pattern is formed on the surface of a transparent substrate such as a glass substrate, a liquid crystal alignment film is formed by flexographic printing using the above-mentioned flexographic printing plate, If necessary, the substrate is subjected to orientation treatment by rubbing or the like.

Subsequently, two sheets of these substrates were prepared, and a liquid crystal material was sandwiched between the transparent electrode layers in a state where the respective transparent electrode layers were aligned with each other and fixed to each other to form a laminate, and furthermore, A polarizing plate is disposed and a liquid crystal display device is manufactured.

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

For example, the number of the divided bodies 4 constituting the ink transfer layer 6 may be two or three, or five or more. Each of the divided bodies 4 may have different shapes and sizes depending on which position of the ink transfer layer 6 is formed. However, it is preferable to use at least two divided bodies 4 having the same shape and same dimensions in combination in consideration of omitting labor required for combination.

In addition, various design changes can be made without changing the gist of the present invention.

Example

&Lt; Example 1 >

(Production of model of the divided body 4)

As the photosensitive resin composition on which the surface resin layer 8 is based, a composition comprising a urethane 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 (NK resin manufactured by Sumitomo Rubber Industries, Ltd.) was prepared.

The photosensitive resin composition was sandwiched between a mold surface and a PET reinforcing film 9 and irradiated with ultraviolet light having a wavelength of 365 nm for 15 minutes to cure the photosensitive resin composition to form a surface resin layer 8, The precursor 27 as a lamination layer of the surface layer 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.

It is to be noted that, at the time of cutting, the side face 14 facing the adjacent divided body of the model of the divided body 4 is not formed as an inclined face (inclination angle of 0 占 Example 1-1) (Example 1-2), 30 ° (Examples 1-3), 45 ° (Examples 1-4), and 60 ° (Example 1-5) were prepared in the same manner as in Example 1 .

The defective goodness of cut workability at the time of cutting was evaluated based on the following criteria.

Bad (B): Workability of cutting the precursor (27) was bad, and partial fracture and smoothness were lowered on the cut surface.

Normal (N): The workability to cut out the precursor was better than the above "Bad" and also worse than the "Good". On the cut surface, there was a slight decrease in partial fracture and smoothness, but it was at a practical level.

Good (G): The workability of cutting out the precursor 27 is better than the above "Normal" and also worse than "Excellent". Further, on the cut surface, there was no reduction in partial fracture or smoothness, and the finish was satisfactory.

Excellent (E): The precursor 27 could be cut with extremely good workability. Further, on the cut surface, there was no reduction in partial fracture or smoothness, and the finish was satisfactory.

(Production of model of flexographic printing plate 1)

The two divided bodies 4 were bonded to each other in accordance with the above-described procedure shown in Figs. 1 to 3, thereby manufacturing a model of the flexographic printing plate 1. Fig.

Further, as the divided body, two pieces each having the same inclination angle? Of side were combined.

The above composition (NK resin manufactured by Sumitomo Rubber Industries, Ltd.) was used as the photosensitive resin composition 20 for bonding the divided bodies 4. As the reinforcing sheet 2, an adhesive layer 17 was laminated on one side of the PET reinforcing film.

The photosensitive resin composition 20 was filled in the gap 19 and irradiated with ultraviolet light having a wavelength of 365 nm for 15 minutes in a state of being covered with the film 21 made of PP to perform a curing reaction, Was bonded to the cured product (5) of the photosensitive resin composition (20).

&Lt; Contamination of bubbles &

It was observed whether or not bubbles were mixed in the cured product 5 of the photosensitive resin composition 20 connecting the two divided parts 4 of the model of the produced flexographic printing plate.

<Tensile Property Test>

The model of the flexographic printing plate thus produced was cured at room temperature for 18 hours, and then the reinforcing film was peeled off using a ham slicer. Thereafter, as described in JIS K6251: 2010 &quot; Vulcanized rubber and thermoplastic rubber- Dumbbell-shaped three-piece test piece, and punched out so that the joints between the divided pieces 4 were positioned so as to traverse the parallel portion.

Then, under the room temperature environment, the maximum tensile force (N) to be recorded when the film was stretched according to the measuring method described in the above standard was obtained.

In Example 1-1, since the bubbles were confirmed, a model in which air bubbles were removed after filling the photosensitive resin composition 20 separately (without bubbles) was prepared, and a tensile test was conducted.

<Overall judgment>

The bubble free of Example 1-1 was used as a standard (C), and a comprehensive evaluation was conducted based on the following criteria.

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

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

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

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

Table 1 shows the above results.

Example 1-1 Examples 1-2 Example 1-3 Examples 1-4 Examples 1-5 bubble has exist none none none none none Inclination angle &amp;thetas; (DEG) 0 0 10 30 45 60 Tensile force (N) 4.8 5.5 5.6 6.4 7.8 11.0 Kurt's workability E E E E G N Total judgment N C G E E G

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

From the results of Examples 1-2 to 1-5, it was found that bubbles can be made difficult to remain by making the side surface 14 be a slope, and the tensile properties can be further improved.

From the results of Examples 1-2 to 1-5, it is preferable that the inclination angle &amp;thetas; of side face 14 is 10 DEG or more, particularly 20 DEG or more in consideration of further improving tensile properties. It has been found that it is preferable that the angle is 60 DEG or less, particularly 45 DEG or less in consideration of improvement of workability.

1: Flexo printing plate
1A, 1B: plate sheet
2: reinforced sheet
3: One side
4:
5: Hardened cargo
6: ink transfer layer
7: Printed surface
8: Surface layer resin layer
9: reinforced film
10: Adhesive surface
11: Pressure sensitive adhesive sheet
12: One side
13: Spacer
14: Side
15: Side
16: opposite side
17: Adhesive layer
18: reinforced film
19: Clearance
20: Photosensitive resin composition
21: Film
22 and 23:
24, 25:
26: Spacer
27: precursor
28:
29:
61:
62: Groove
63: Pin hole
P ₁₁ ~ P _xy : pattern
θ: Tilt angle

Claims (8)

A plurality of sheet-shaped divided bodies serving as the base of the ink transfer layer were adhered to each other on the adhered surface formed in a planar arrangement of the temporary fixing adhesive sheet with the spacers of a certain width in between A temporary fixing process,
A step of removing the temporary fixing adhesive sheet and the spacer after the reinforcing sheet covering the plurality of divided bodies is temporarily bonded to the plurality of divided bodies temporarily fixed via the adhesive layer,
A step of filling a space between the plurality of divided bodies with the spacers removed, with a photosensitive resin composition that undergoes a curing reaction upon irradiation of an actinic ray; and
And 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 the photosensitive resin composition filled in the gap to cure by irradiation of the actinic light ray Of the flexographic printing plate. The method according to claim 1,
Wherein the pressure-sensitive adhesive layer comprises a composition which, together with the photosensitive resin composition, undergoes a curing reaction upon irradiation of the actinic ray. 3. The method according to claim 1 or 2,
Wherein the divided body is a sloped side inclined with respect to the thickness direction on the side facing the adjacent divided body. The method of claim 3,
Wherein the inclined surface is formed by cutting a sheet-like precursor serving as a basis of the divided material by inclining the precursor in the thickness direction of the precursor by a rotary cut method or a guillotine cut method. 5. The method according to any one of claims 1 to 4,
The photosensitive resin composition filled in the gap is covered with a film having transparency to the active ray to irradiate the actinic ray through the film to cure the photosensitive resin composition, Of the flexographic printing plate. 6. The method according to any one of claims 1 to 5,
And a step of patterning the printed surface of the formed flexographic printing plate in correspondence with a predetermined printing pattern. 6. The method according to any one of claims 1 to 5,
A method for producing a flexographic printing plate, comprising using a divided body obtained by patterning in correspondence with a predetermined printing pattern in advance. A process for producing a liquid crystal display element comprising a step of forming a liquid crystal alignment film by flexographic printing using a flexographic printing plate produced by the production method according to any one of claims 1 to 7.

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