KR20160070482A - Method for preparing coating film - Google Patents

Abstract

The present invention relates to a method for producing a coating film. According to the method for producing a coating film of the present invention, a patterned coating layer can be formed by only one coating operation. The method for producing a coating film comprises the steps of: forming a first pattern by applying a first coating solution using a slot die coater including a shim on one side of a base material; forming a second pattern by applying a second coating solution using an ink-jet coater on a portion in which the first coating solution is not applied; and forming a patterned single coating layer by curing the first and the second coating solution.

Description

TECHNICAL FIELD The present invention relates to a method for preparing a coating film,

The present invention relates to a method for producing a coating film. More particularly, the present invention relates to a method for producing a coating film capable of forming a patterned coating layer by a single coating process.

A die coater is a coating apparatus in which a coating liquid is discharged and applied between slots while maintaining a uniform gap on a coating object such as a film. Coating with a die coater is widely used for various coating films, liquid crystal panels, displays and the like because it can form a coating film having a relatively uniform thickness with less waste of the coating solution as compared with the spin coating method.

For example, in order to form a photocurable resin on a substrate such as a film, a coating composition containing a photocurable binder is applied on a substrate using a die coater and is then polymerized by light irradiation such as UV to form a curable resin layer .

1 is an exploded view illustrating a conventional die coater.

Referring to Figure 1, a typical die coater comprises a first die 1; A second die 3; And the shim 2, and the first and second dies 1, 3 are joined by placing the shim 2.

The coating liquid is supplied from the coating liquid supply unit (not shown in the figure) to the core 2, and is discharged onto a substrate such as a film through a nozzle unit formed in a diaphragm shape to form a coating film.

Korean Patent Laid-Open Publication No. 2008-0047702 discloses a die coater for use in stripe pattern coating. According to Korean Unexamined Patent Publication (KOKAI), it is disclosed that a shim has at least one partition at the bottom of a coating agent flow path, and a coating agent is branched and discharged by a partition to form a stripe pattern.

However, although the protruding stripe pattern coating is possible according to the method disclosed in Korean Patent Laid-Open Publication No. H10-223659, no method for forming a patterned coating layer having a different composition in the same coating layer has been disclosed.

Accordingly, it is an object of the present invention to provide a method for producing a coating film which can form a patterned coating layer only by a single coating operation.

According to an aspect of the present invention,

Forming a first pattern by applying a first coating solution on a first surface of a substrate using a slot die coater including a concave and a convex shim;

Forming a second pattern by applying a second coating liquid to an area where the first coating liquid is not applied using an ink-jet coater; And

And curing the first and second coating liquids to form a patterned single coating layer.

According to the method for producing a coating film of the present invention, a patterned coating layer can be formed by only one coating operation.

1 is an exploded view illustrating a conventional die coater.
2 is a perspective view showing a die coater according to an embodiment of the present invention.
Fig. 3 is an exploded view showing the die coater of Fig. 2 in an exploded state.
4A and 4B are views showing a coating apparatus and a method of manufacturing a coating film according to an embodiment of the present invention.
5 is a view showing a step of forming a first pattern and a second pattern according to a method of manufacturing a coating film according to the present invention.
6 is a view showing a conventional curing member according to the prior art.
7 to 10 are views showing contact type photocurable members according to an embodiment of the present invention.
11 to 12 are views showing contact thermal curing members according to an embodiment of the present invention.

Moreover, the terminology used herein is for the purpose of describing exemplary embodiments only and is not intended to be limiting of the present invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises", "comprising", or "having" are used to designate the presence of stated features, steps, components, or combinations thereof, and are not intended to preclude the presence of one or more other features, Components, or combinations thereof, as a matter of convenience, without departing from the spirit and scope of the invention.

Also in the present invention, when each element is referred to as being formed on or "on " each element, it is meant that each element is formed directly on top of each element, It may be additionally formed on the substrate, between the layers, on the object, and on the substrate.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular forms disclosed, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Hereinafter, a method for producing a coating film of the present invention will be described in detail with reference to the drawings.

According to the present invention,

Forming a first pattern by applying a first coating solution on a first surface of a substrate using a slot die coater including a concave and a convex shim;

Forming a second pattern by applying a second coating liquid to an area where the first coating liquid is not applied using an ink-jet coater; And

And curing the first and second coating liquids to form a patterned single coating layer.

The die coater is one of the coating apparatuses. The coating using the die coater forms two shims on two dies while maintaining a uniform gap on a coating object such as a film. A coating liquid is discharged and applied between gaps formed, that is, slots. Coating with a die coater has a lower waste of coating liquid than a spin coating method, and a coating film having a relatively uniform thickness can be formed, which is widely used for forming a coating film.

Meanwhile, for a multi-layer coating in which two or more coating layers are stacked, a dual slot die coater including two or more slots may be used.

For example, a manufacturing method is known in which a plurality of slots are provided in a die coater, a plurality of coating compositions are sequentially coated by the slots, and a plurality of coating resin layers are formed by curing.

However, even in the case of forming a plurality of coating layers using such a dual slot die coater, since one coating layer is formed by the coating liquid discharged from one slot corresponding thereto, it is possible to have different compositions in the same coating layer, It is impossible to form a coated layer.

Accordingly, it is an object of the present invention to provide a coating method and a coating method capable of forming a single coating layer patterned by a single coating process by combining a coating method using a slot die coater including a shim of a concavo-convex pattern shape and a coating method using an ink- A method for producing a coating film is provided.

FIG. 2 is a perspective view showing a die coater according to an embodiment of the present invention, and FIG. 3 is an exploded view showing the die coater of FIG. 2 in an exploded state.

2 and 3, a die coater 100 according to an embodiment of the present invention includes a first die 10; A second die 20; And a shim 30 coupled to the first die 10 and the second die 20 and including a concave portion 30a and a convex portion 30b.

More specifically, the concavo-convex pattern of the shim 30 is composed of a concave portion 30a and a convex portion 30b alternately formed along the longitudinal direction of the shim 30. The concave portion 30a of the shim 30 is a slot portion through which the first coating liquid is discharged and the convex portion 30b serves as a partition for separating the adjacent concave portion 30a. 2, there is a clearance of the thickness of the padding 30 between the first die 10 and the second die 20 and the padding of the padding 30 Since the slot is formed by the concave portion 30a, the slot formed by the concave portion 30a serves as a flow path through which the first coating liquid is discharged.

Therefore, unlike the conventional core in which the slot through which the coating liquid is discharged is flat without the concave portion and the convex portion, the first coating liquid applied by the core 30 is applied as the number and width of the concave portions 30a, The first coating liquid is not applied to the portion where the slot is not formed due to the portion 30b. Therefore, the first coating liquid discharged from the shim 30 is not applied to the entire area of the base material, but is applied in the shape of the first pattern defined by the number and width of the recesses 30a.

2 and 3, the padding 30 has three concave portions. However, the number and the shape of the padding 30 are not limited as shown in Figs. 2 and 3, and the shapes of the concave and convex portions having the concave and convex portions It is intended to fall within the scope of the present invention. The distal convex portion 30c located at both ends in the longitudinal direction with respect to the padding 30 prevents leakage of the first coating liquid applied on the substrate to both sides and prevents the total width w of the applied first coating liquid w ).

The die coater 100 of the present invention is capable of separating from each other, although the first die 10, the shim 30, and the second die 20 are sequentially combined to form a coupled state during the coating operation. Therefore, the shim 30 having the concavo-convex pattern formed according to the pattern to be formed can be used by being changed as needed. In addition, since the base 30 of the conventional slot die coater can be used, only the shim 30 formed with the concavo-convex pattern can be used for replacement, thereby reducing the cost of constructing a new equipment.

The coupling may be accomplished by a detachable coupling means commonly used in the art.

The thickness of the shim 30 is not particularly limited, and may be about 30 to about 300 占 퐉, or about 50 to about 200 占 퐉.

A feed pipe for feeding the first coating liquid into the slots formed by the concave portions 30a of the shim 30 and a second pipe for supplying the first coating liquid to the first die 10 or the second die 20, A cavity in which a predetermined amount of the first coating liquid is temporarily stored, and a diaphragm pump capable of driving and measuring quantitatively.

4A and 4B are views showing a coating apparatus and a method of manufacturing a coating film according to an embodiment of the present invention. FIG. 4A is a view of a coating apparatus according to the present invention and a method for producing a coating film using the same, and FIG. 4B is a view showing a coating apparatus according to the present invention and a method for producing a coating film using the same, Fig.

4A and 4B, a substrate 105 is first wound on a roll 115 and moved in one direction while the concave of the core 30 of the die coater 100 The first coating liquid discharged from the first portion 30a is coated on the substrate 105 to form the first pattern 200a. At this time, the first pattern 200a does not occupy the entire area on the base 105, but is formed in a pattern defined by the concave portion 30a of the padding 30 of the die coater 100 as described above.

Next, the second coating liquid discharged from the nozzle 40a of the ink-jet coater 400 is applied using the inkjet coater 400 to form the second pattern 200b. The nozzle 40a of the inkjet coater 400 to which the second coating liquid is applied is positioned by the die coater 100 Is set so as to be positioned at a portion corresponding to the convex portion 30b of the die coater 100, which is a portion where the first coating liquid is not applied. Accordingly, the second pattern 200b is formed on the portion where the first pattern 200a is not formed, that is, the remaining area portion on which the first coating liquid is not applied on the substrate 105. [

According to one embodiment of the present invention, the coating thickness of the first and second patterns 200a, 200b is substantially the same, and may be from about 0.1 to about 200 占 퐉, or from about 1 to about 200 占 퐉. When the difference in coating thickness of the first and second patterns 200a and 200b is within about 3 mu m, the thickness is substantially the same. The coating thickness of the first and second patterns 200a and 200b can be adjusted by adjusting the distance between the die coater 100 and the base material 105 and the distance between the inkjet coater 400 and the base material 105. [

As a result, the coating areas of the first and second patterns 200a and 200b are combined to form one continuous coating layer 300, and the first and second patterns 200a and 200b are patterned A single coating layer 300 is formed.

5 is a view showing a step of forming a first pattern and a second pattern according to a method of manufacturing a coating film according to the present invention.

5, a method of manufacturing a coating film according to the present invention includes forming a first pattern 200a formed by a first coating liquid discharged from a concave portion 30a of a shim 30 of a die coater 100 , Forming a second pattern (200b) formed by a second coating liquid discharged from the inkjet coater (400), and curing the first and second coating liquids described below, The second patterns 200a and 200b are combined with each other to form a single patterned single coating layer 300. Thus, using the method of making a coating film of the present invention, a laminated film comprising the substrate 105 and the patterned mono-coating layer 300 can be formed, and the formation of a patterned coating layer by a single coating operation Lt; / RTI >

As described above, according to the manufacturing method of the present invention, it is possible to form a coating layer having a continuous surface and substantially the same thickness and having a patterned shape in one layer by one coating operation, Variously patterned coating layers can be formed according to the negative design. In addition, by making the compositions of the first and second coating liquids different from each other, a patterned coating layer including regions having different optical and mechanical properties in one layer can be formed.

Next, the first and second coating liquids are cured to form a patterned coating layer.

According to an embodiment of the present invention, the step of curing the first and second coating liquids may be performed using a contact type curing member.

Since the first and second coating liquids are individually coated from the two shims as described above, the surface states of the first and second patterns may be different depending on the composition of the first and second coating liquids. As a result, the entire surface state of the coating layer may not be uniform, and this point can be alleviated by using the contact type curing member.

6 is a view showing a conventional curing member according to the prior art.

6, a laminate 110 coated with a first and a second coating liquid on a substrate is wound on a roll 120 or moved by a belt (not shown) or the like, To perform the curing. At this time, the light source (in the case of photo-curing) or the heat source (in the case of thermal curing) used as the curing member 130 is located a certain distance from the coating solution. Therefore, in order to increase the flatness of the surface of the coating layer, it is necessary to perform a leveling process before or after curing.

However, according to the present invention, since the leveling process and the curing process can be performed at the same time by using the contact type curing member, the process can be further shortened and the flatness of the coating layer can be improved. The contact type curing member includes a nip roll and a light source or a heat source.

7 to 12 are views showing contact type curing members according to an embodiment of the present invention. 7 to 10 are views showing contact type photocurable members according to an embodiment of the present invention, and FIGS. 11 to 12 show contact type heat curing members according to an embodiment of the present invention, FIG.

Referring to FIGS. 7 to 10, the first and second coating liquids are coated on the substrate using the die coater to form a laminate body 110, and then the laminate body 110 is wound around the roll 120 The curing is performed by the contact type curing member 200 with respect to the first and second coating liquids. At this time, the contact type curing member 200 is brought into contact with the surfaces of the first and second coating liquids by the nip roll 140, and ultraviolet rays are irradiated from the light source 130 to the first and second coating liquids, And simultaneously performs the photocuring of the first and second coating liquids and the leveling process of the surface.

When the curing by the photocuring method is performed as described above, the nip roll may be made of a highly transparent material so that light emitted from a light source located inside or outside the nip roll can reach the coating liquid. Preferably, the nip roll may be made of glass.

First, Fig. 7 exemplarily shows the form of a contact type curing member in which the light source is located inside the nip roll. At this time, it is preferable to provide the reflective member 150 inside the nip roll 140 so that the light emitted from the light source 130 to the opposite side of the laminate 110 can be reflected without being lost to reach the coating liquid.

Figs. 8-10 illustrate exemplary forms of contact curing members in which the light source is located outside the nip roll. 8 and 9 are views in which the light source 130 is positioned on the upper side of the nip roll 140 and Fig. 10 is a view in which the light source 130 is positioned on the side of the nip roll 140. Fig.

8 and 9, it is preferable that the reflective member 150 is provided so that ultraviolet rays radiated to the opposite side of the stack 110 from the light source 130 can be reflected without being lost to reach the coating liquid.

8, when the light source 130 is positioned above the nip roll 140, the reflection member 150 may be provided on the light source 130, or may be provided on the light source 130, In addition to the reflective member 150, a reflective member 150 may further be provided on both sides of the nip roll 140.

10, the reflective member 150 may be provided on the outer side of the light source 130 or may be provided on the outer side of the light source 130 in addition to the light emitted from the light source 130 inside the nip roll 140. [ Can be provided on one side.

However, the shape of the contact-type curing member, the position and the number of the light source and the reflective member are not limited to those shown in Figs. 8 to 10, and the contact with the nip roll 140 causes the layer 110 to move along with leveling It is considered to be within the scope of the present invention as long as it allows curing to occur.

Also, the light irradiation amount of the light source is not particularly limited and can be adjusted as needed, for example, about 20 to about 600 mJ / cm ² , or about 50 to about 500 mJ / cm ² . The light source is not particularly limited as long as it can be used in the technical field to which the present technology belongs. For example, a high pressure mercury lamp, a metal halide lamp, a black light fluorescent lamp, or the like can be used.

11 to 12 are views showing contact thermal curing members according to an embodiment of the present invention.

11 to 12, a laminated body 110 coated with a first and a second coating liquid on a substrate is wound around a roll 120 while moving the first and second coating liquids to a contact type thermosetting member 200 ). ≪ / RTI > At this time, the contact type thermosetting member is brought into contact with the surfaces of the first and second coating liquids by the nip roll, and heat is applied from the heat source 160 to the first and second coating liquids, And simultaneously performs the surface hardening process and the surface leveling process.

In the case of performing the curing by the thermosetting method as described above, a heat source may be provided in the nip roll, or the nip roll may serve as a heat source by heating the nip roll itself, so that thermal curing can be performed by contact with the nip roll . At this time, the nip roll may be made of a material having high thermal conductivity so that heat can be transmitted more easily. Preferably, the nip roll may be made of stainless use steel.

11 illustrates the shape of the contact type curing member 200 in which the heat source 160 is located inside the nip roll 140. Figure 12 shows the state of the nip roll 140 by heating the nip roll 140 itself without a separate heat source, Type curing member that serves as a heat source at the same time.

The temperature of the heat source can be controlled according to the heat curing temperature of the first and second coating liquids, and the heat source can be used as long as it can be used in the technical field to which the present technology belongs.

When the first and second coating liquids have both a thermosetting property and a curing property, the contact photo-curing member and the contact-type photo-curing member may be sequentially or simultaneously combined to perform photo-curing and thermal curing.

According to an embodiment of the present invention, the first and second coating liquids may be dried before the first and second coating liquids are cured.

In the method for producing a coating film of the present invention, the substrate to which the first and second coating liquids are applied may be a transparent plastic resin which is commonly used, and can be used without any particular limitation in the production method and materials of the substrate such as stretched film or non- have. More specifically, according to one embodiment of the present invention, the substrate may be made of, for example, polyester such as polyethylene terephthalate (PET), polyethylene (polyethylene terephthalate) such as ethylene vinyl acetate (EVA) A cyclic olefin copolymer (COC), a polyacrylate (PAC), a polycarbonate (PC), a polyethylene (PE), a polyethylene (PE) (PMMA), polyetheretherketone (PEEK), polyethylenenaphthalate (PEN), polyetherimide (PEI), polyimide (PI), triacetyl A film containing triacetylcellulose (TAC), methyl methacrylate (MMA), a fluorine resin, or the like. The supporting substrate may be a single layer or a multi-layer structure including two or more substrates made of the same or different materials as needed, and is not particularly limited.

According to one embodiment of the present invention, the substrate is a substrate having a multilayer structure of polyethylene terephthalate (PET), a substrate having a structure of two or more layers formed by coextrusion of polymethyl methacrylate (PMMA) / polycarbonate (PC) .

Also, according to one embodiment of the present invention, the substrate may be a substrate comprising a copolymer of polymethylmethacrylate (PMMA) and polycarbonate (PC).

The thickness of the substrate is not particularly limited, but a substrate having a thickness of about 20 to about 1,200 占 퐉, or about 20 to about 500 占 퐉 may be used.

The first and second coating liquids may independently include the same or different ones, and may include a photocurable binder and / or a thermosetting binder.

The photocurable binder is a monomer, oligomer, or polymer having a functional group such as an acrylate group, a methacrylate group, a vinyl group, or a thiol group which is cured by light irradiation and is capable of crosslinking polymerization with each other, Photo-curable elastomer, and the like, but the present invention is not limited thereto.

The acrylate monomer may be, for example, selected from the group consisting of hydroxyethyl acrylate (HEA), hydroxyethyl methacrylate (HEMA), hexanediol diacrylate (HDDA), tripropylene glycol diacrylate (TPGDA), ethylene glycol di Acrylate (EGDA) trimethylolpropane triacrylate (TMPTA), trimethylolpropane ethoxy triacrylate (TMPEOTA), glycerin propoxylated triacrylate (GPTA), pentaerythritol tetraacrylate (PETA) And pentaerythritol hexaacrylate (DPHA). The acrylate monomers may be used alone or in combination of two or more.

The photo-curable elastomer refers to a polymer material containing a functional group that can be cross-linked by ultraviolet irradiation and exhibiting elasticity.

In accordance with one embodiment of the present invention, the photocurable elastomer has a melt index of at least about 15%, such as from about 15 to about 200%, or from about 20 to about 200%, or from about 20 to about 200%, as measured by ASTM D638 It can have an elongation of 150%. The photo-curable elastomer may be at least one selected from the group consisting of, for example, polycaprolactone, urethane acrylate-based polymer, and polyrotaxane.

The thermosetting binder is an epoxy group, a vinyl group, a hydroxyl group, an alkoxy group, a thiol group, a melamine group, a siloxane group, or the like which is cured by heating at a temperature higher than a predetermined temperature, Oligomers, or polymers having functional groups of the general formula (1), but the present invention is not limited thereto.

In addition, the first and second coating liquids may further include components commonly used in the art such as inorganic fine particles, surfactant, yellowing inhibitor, leveling agent, antifouling agent, etc., in addition to the photocurable binder and the thermosetting binder . The content thereof is not particularly limited, since it can be variously controlled within a range that does not deteriorate the physical properties of the film of the present invention.

According to an embodiment of the present invention, inorganic fine particles having a particle size of nanoscale as the inorganic fine particles, for example, nanoparticles having a particle size of about 100 nm or less, or about 10 to about 100 nm, or about 10 to about 50 nm, Can be used. As the inorganic fine particles, for example, silica fine particles, aluminum oxide particles, titanium oxide particles, or zinc oxide particles can be used.

The surfactant may be a fluorinated acrylate, a fluorinated surfactant or a silicone surfactant having 1 to 2 functionalities. The surfactant may be dispersed or crosslinked in the crosslinked copolymer. Further, the additive may include a yellowing inhibitor, and examples of the yellowing inhibitor include a benzophenone-based compound or a benzotriazole-based compound.

However, in the manufacturing method of the present invention, the components of the first and second coating liquids are not limited to those described above, and the components and the content of the coating liquid may be different in order to achieve desired properties.

According to the method of manufacturing a film of the present invention, the first pattern formed by the first coating liquid and the second pattern formed by the second coating liquid are combined to form a single layer coating film. Thus, according to the method for producing a film of the present invention, it becomes possible to form a patterned coating layer by a single coating operation. Further, by performing the leveling process and the curing process simultaneously using the contact type curing member, the process can be further shortened and the flatness of the coating layer can be improved.

Since the film including the patterned coating layer produced according to the manufacturing method of the present invention as described above can have different physical and optical properties in one coating layer, .

Best Mode for Carrying Out the Invention Hereinafter, the function and effect of the present invention will be described in more detail through specific examples of the present invention. It is to be understood, however, that these embodiments are merely illustrative of the invention and are not intended to limit the scope of the invention.

< Example >

Preparation of coating compositions

Manufacturing example  One

10 g of pentaerythritol tetraacrylate (PETA), 10 g of trimethylolpropane triacrylate (TMPTA), 0.2 g of a photoinitiator (trade name: Irgacure 184) and 0.01 g of a fluorine surfactant (trade name: FC4430) MEK) to prepare a coating composition.

Manufacturing example  2

, 10 g of hexanediol diacrylate (HDDA), 10 g of a urethane acrylate polymer (trade name: U-4HA), 0.2 g of a photoinitiator (Irgacure 184) and 0.01 g of a fluorine surfactant (trade name: FC4430) Ketone (MEK) to prepare a second coating composition.

Preparation of coating film Example

Example  One

As shown in Figs. 4A and 4B, a coating apparatus composed of a die coater 100 and an inkjet coater 400 was prepared.

The die coater was placed between the first and second dies in such a manner that the length of the concavo-convex pattern was 40 cm, And a shim having a thickness of 100 mu m. The concave-convex pattern was composed of one convex portion having a width of 5 cm at the center and a concave portion at both sides of the convex portion. And one inkjet coater was positioned at a position corresponding to the convex portion of the core.

While the PET (polyethyleneterephthalate) base material was wound around a roll, the coating composition of Preparation Example 1 was applied from a die coater onto the substrate, and the coating composition of Production Example 2 was applied sequentially from an inkjet coater.

After application, curing was performed by a contact type photo-curing apparatus as shown in Fig. 7 to prepare a film on which a patterned single coating layer was formed.

Example  2

As shown in Figs. 4A and 4B, a coating apparatus composed of a die coater 100 and an inkjet coater 400 was prepared.

The die coater was provided with a shim having a length of 40 cm and a thickness of 100 占 퐉 between the first and second dies. The corrugation pattern consisted of two convex portions each having a width of 3 cm and a concave portion on both sides of the convex portion at a distance of 5 cm from both sides of the center. Two inkjet coaters were placed at positions corresponding to the convex portions of the core.

The coating composition of Preparation Example 1 was applied from a die coater and the coating composition of Preparation Example 2 was applied sequentially from an ink jet coater onto a substrate while the PET substrate was wound on a roll.

After the application, curing was performed by a contact type photo-curing apparatus as shown in Fig. 8 to prepare a film on which a patterned single coating layer was formed.

Example  3

As shown in Figs. 4A and 4B, a coating apparatus composed of a die coater 100 and an inkjet coater 400 was prepared.

The die coater was provided with a shim having a length of 40 cm and a thickness of 125 占 퐉 between the first and second dies. The concave-convex pattern consisted of one convex portion having a width of 3 cm at the center and a concave portion on both sides of the convex portion. And one inkjet coater was positioned at a position corresponding to the convex portion of the core.

The coating composition of Preparation Example 1 was applied from a die coater and the coating composition of Preparation Example 2 was applied sequentially from an ink jet coater onto a substrate while the PET substrate was wound on a roll.

After application, curing was performed by a contact type photo-curing apparatus as shown in Fig. 9 to prepare a film on which a patterned single coating layer was formed.

Example  4

As shown in Figs. 4A and 4B, a coating apparatus composed of a die coater 100 and an inkjet coater 400 was prepared.

The die coater was provided with a shim having a length of 40 cm and a thickness of 500 탆 between the first and second dies. The concave-convex pattern consisted of two convex portions each having a width of 3 cm and a concave portion on both sides of the convex portion at a distance of 10 cm from both sides of the center. Two inkjet coaters were placed at positions corresponding to the convex portions of the core.

The coating composition of Preparation Example 1 was applied from a die coater and the coating composition of Preparation Example 2 was applied sequentially from an ink jet coater onto a substrate while the PET substrate was wound on a roll.

After application, curing was performed by a contact type photo-curing apparatus as shown in Fig. 7 to prepare a film on which a patterned single coating layer was formed.

Example  5

As shown in Figs. 4A and 4B, a coating apparatus composed of a die coater 100 and an inkjet coater 400 was prepared.

The die coater was provided with a shim having a length of 40 cm and a thickness of 200 占 퐉 between the first and second dies. The concave-convex pattern consisted of one convex portion having a width of 3 cm at the center and a concave portion on both sides of the convex portion. And one inkjet coater was positioned at a position corresponding to the convex portion of the core.

The coating composition of Preparation Example 1 was applied from a die coater and the coating composition of Preparation Example 2 was applied sequentially from an ink jet coater onto a substrate while the PET substrate was wound on a roll.

After application, curing was performed by a contact type photo-curing apparatus as shown in Fig. 10 to prepare a film on which a patterned single coating layer was formed.

Comparative Example  One

A coating apparatus composed of a die coater and an inkjet coater having a 40 cm thick shim with no concavo-convex pattern between the first and second dies was prepared, and the inkjet coater was placed at the center of the die coater .

The coating composition of Preparation Example 1 was applied from a die coater and the coating composition of Preparation Example 2 was applied sequentially from an ink jet coater onto a substrate while the PET substrate was wound on a roll.

After application, curing was performed by a contact photocuring apparatus as shown in Fig.

The thickness and elastic modulus of the coating films of Examples 1 to 5 and Comparative Example 1 were measured and are shown in Table 1 below.

The thickness of the coating layer The thickness variation of the first coating pattern and the second coating pattern Modulus of elasticity of the first pattern * Elastic modulus of the second pattern * Example 1 20 탆 <1 μm 6.5 GPa 1.0 GPa Example 2 20 탆 <1 μm 6.5 GPa 1.0 GPa Example 3 25 탆 <1 μm 6.5 GPa 1.0 GPa Example 4 20 탆 <1 μm 6.5 GPa 1.0 GPa Example 5 20 탆 <1 μm 6.5 GPa 1.0 GPa Comparative Example 1 20 ~ 25㎛ 5 탆 1.0 to 1.5 GPa

* In Table 1 above, the modulus refers to the value measured according to ASTM E2546-07 using a nanoindenter.

Referring to Table 1, in the films of Examples 1 to 5 produced according to the manufacturing method of the present invention, there was almost no thickness variation of the first and second patterns, and a patterned single coating layer was successfully formed.

However, in Comparative Example 1, the first and second coating compositions were partially mixed to form a sloped coating layer. In the middle portion, the thickness deviation was thinned to 25 占 퐉 from the thickest 25 占 퐉 to the edge, There was a difference between the middle part and the end part of the coefficient.

Claims (11)

Forming a first pattern by applying a first coating solution on a first surface of a substrate using a slot die coater including a concave and a convex shim;
Forming a second pattern by applying a second coating liquid to an area where the first coating liquid is not applied using an ink-jet coater; And
And curing the first and second coating liquids to form a patterned single coating layer.
The method of claim 1, wherein the concave portion is a slot portion through which the first coating liquid is discharged, and the convex portion is a partition separating the adjacent concave portion.
The method according to claim 1, wherein the first coating liquid applied by the slot die coater is applied as the number and width of the concave portions.
The method of claim 1, wherein the first pattern and the second pattern are combined to form a single layer coating film.
The method for producing a coating film according to claim 1, wherein the composition of the first and second coating liquids is different.
The method according to claim 1, wherein the first and second patterns have a thickness of 0.1 to 200 탆 and a thickness difference of 3 탆 or less.
The method of claim 1, wherein the curing of the first and second coating liquids is performed simultaneously with the leveling process.
The method according to claim 1, wherein the step of curing the first and second coating liquids is carried out using a contact type curing member.
9. The method of claim 8, wherein the contact curing member comprises a nip roll, a light source, and a reflective member.
9. The method of claim 8, wherein the contact curing member comprises a nip roll and a heat source.
The method according to claim 1, further comprising drying the first and second coating liquids before curing the first and second coating liquids.

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