WO2016048091A1 - Optical sheet comprising nanopattern and method for manufacturing same - Google Patents

Abstract

The present invention relates to a method for manufacturing an optical sheet, the method comprising the steps of: (S1) supplying a curable resin composition and forming a onefold layer; (S2) causing the onefold layer, which has been formed in step (S1), to pass through a release mold having a nanopattern formed thereon, the nanopattern having a pitch of 50 to 500nm and an aspect ratio of 1.0 to 5.0, thereby obtaining a onefold layer, which has the nanopattern transferred to the surface thereof; and (S3) curing the onefold layer, to which the nanopattern has been transferred, obtained in step (S2).

Description

Optical sheet containing nanopattern and manufacturing method thereof

The present invention relates to an optical sheet used in a liquid crystal display, and more particularly, to an optical sheet including a nanopattern and a manufacturing method thereof.

Recently, various studies have shown that anti-reflective effect and lotus-effect may be realized when a fine concavo-convex structure having a period of visible light wavelength (about 380 to 780 nm) or less is formed on a surface of an optical device such as a display, a light emitting diode, and a solar cell. It is known that the efficiency of the optical device can be improved by the expression of the light. Such a fine concave-convex structure is called a moth-eye structure, and the micro-concave-convex structure buffers a change in refractive index occurring between two media having different refractive indices. That is, when light passes through two different media, a reflection phenomenon occurs due to a difference in refractive index. If fine irregularities exist between the two media, the refractive index of the two media is continuously increased, thereby suppressing the reflection phenomenon.

As a method of forming a fine uneven structure on the surface of an optical element, the method (nanoimprint) containing the following steps (i)-(iii) is known, for example.

(i) providing an active energy ray curable composition between a mold having a fine concavo-convex structure and an inverted structure and a base film serving as a body of the light transmissive film;

(ii) irradiating and curing active energy rays such as ultraviolet rays to the active energy ray curable composition to form a cured resin layer having a fine uneven structure on the surface of the base film; And

(iii) A step of separating the mold from the cured resin layer.

By the way, since the said mold has the period of a pore normally nanometer and the aspect ratio of a pore is comparatively large, the contact interface of a mold and an active-energy-ray-curable composition increases significantly. As a result, it is difficult to accurately stamp the pattern formed on the mold onto the cured resin layer, and as the interfacial force increases, the work itself of separating the mold in the step (iii) becomes very difficult. In particular, since the operation of separating the mold can be directly connected to productivity, several patent technologies have been disclosed to solve this problem.

For example, Japanese Unexamined Patent Application Publication No. 2007-326367 discloses a method of treating a surface of a side on which a fine concavo-convex structure is formed with a release agent (external release agent), and Japanese Patent Publication No. 2009-061628 discloses a phosphate ester as an internal release agent. The method of using the solid state photocurable transfer layer which consists of photocurable resin composition containing a system compound was disclosed. However, there is a drawback that if relying only on the release agent treatment as described in the patent, the release property may be gradually degraded by repeated transfer operations or the mold surface may be contaminated due to deposition of the release agent.

On the other hand, PE, PC, PMMA, etc. are used as the base film on which the cured resin layer of the fine concavo-convex structure is formed. Such a base film may be vulnerable to wrinkles and curls although it has excellent transparency and flexibility. In addition, physical properties such as strength may be improved due to the use of the base film, but it is difficult to realize thinning of the article and there is a limit in reducing manufacturing costs.

In addition, as shown in FIG. 1, in the related art, a multilayer structure in which a base film and a cured resin layer are formed is formed, and light transmission loss occurs at an interface between layers, and light that is not transmitted serves as another cause of reflection. Therefore, technologies that do not use a base layer have been proposed, but the method of chemically peeling off a base film after forming a resin layer is limited, and there is a limit that a pattern size that can be implemented is also micro units.

Accordingly, the present invention applies a conventional pattern transfer process such as a roll to roll and a stamp, but forms a nanopattern using only a curable resin without using a base film to form a nanopattern. It is an object of the present invention to provide an inorganic-type nanopattern optical sheet having no light transmission loss (reflection characteristics) due to an interface and exhibiting excellent transmittance of 95% or more.

A first preferred embodiment according to the present invention is an optical sheet manufacturing method comprising the following steps (S1) to (S3).

(S1) supplying a curable resin composition to form a single layer layer; (S2) The single layer layer in which the nano pattern is transferred to the surface by passing the single layer layer formed in the step (S1) through a release mold having a nano pattern having a pitch of 50 to 500 nm and an aspect ratio of 1.0 to 5.0. Obtaining; And (S3) curing the monolayer to which the nanopattern obtained in the step (S2) is transferred.

Curable resin composition according to the first embodiment, the weight average molecular weight of 100 to 30,000 urethane acrylate 100 parts by weight; And 75 to 250 parts by weight of a fluorine-containing siloxane-acrylate oligomer having a weight average molecular weight of 100 to 10,000 based on 100 parts by weight of the urethane acrylate, wherein the curable resin composition is additionally 60 to 100 parts by weight of urethane acrylate To 125 parts by weight of a diluent and 10 to 25 parts by weight of a polymerization initiator, and the curable resin composition accordingly, the viscosity may be 100 to 300 cps.

In addition, the step (S2) according to the first embodiment may include the step of temporarily curing the monolayer layer with a light amount of 50 to 150mj / ㎠ while transferring the nano-pattern, the release mold used in the pattern transfer is silicon It may be coated with one or more release agents selected from the group consisting of fluorine and teflon.

On the other hand, a second preferred embodiment of the present invention 100 weight parts urethane acrylate having a weight average molecular weight of 100 to 30,000; And a curable composition comprising 75 to 250 parts by weight of a fluorine-containing siloxane-acrylate oligomer having a weight average molecular weight of 100 to 10,000 based on 100 parts by weight of the urethane acrylate, and has a pitch of 50 to 500 nm on at least one surface. And a plurality of nanopatterns having an aspect ratio of 1.0 to 5.0.

The optical sheet according to the second embodiment may have a transmittance of 95% or more when irradiated with 550 nm light, and a curl value at 23 ° C. may be 0 mm to 2.0 mm.

In addition, the optical sheet according to the second embodiment may be manufactured by the manufacturing method according to the first embodiment.

The optical sheet according to the present invention is an inorganic type optical sheet which does not use a base material, and since the reflection phenomenon (loss of light) does not occur due to the difference in refractive index between the interface between the base material layer and the resin pattern layer, 95% The above transmittance can be exhibited and the light condensing and diffusing characteristics of the light can be improved.

In addition, since a single-layer optical sheet can be manufactured using only a curable resin, high reliability optical sheet with excellent wrinkle and curl characteristics even after reliability test under constant temperature and humidity (60 ° C, RH85%) and high temperature (120 ° C) conditions. Can be manufactured, thinning, and can be applied to the existing Roll to Roll process as it is, not only mass production, but also because the base film is not used in the process itself, it can secure the price competitiveness by reducing the manufacturing cost .

1 is a cross-sectional view illustrating an example of a conventional nanopattern optical sheet including a nanopattern layer on one or both surfaces of a substrate layer.

2 is a cross-sectional view showing an example of an inorganic material type optical sheet of the present invention formed of a curable resin including a plurality of nanopatterns.

3 is a schematic view showing an example of a roll-to-roll process of forming a pattern on one surface of a single layer layer (curable resin) using a release mold (soft mold) on which a nanopattern is formed.

4 is a schematic view showing another example of a roll-to-roll process of forming a pattern on one surface of a single layer layer (curable resin) using a release mold (hard mold) on which a nanopattern is formed.

5 is a schematic view showing an example of a roll-to-roll process of forming a pattern on both sides of a single layer layer (curable resin) using a release mold having a nanopattern formed thereon.

<Description of the code>

1: Release Mold (Soft Mold) 2: Release Mold (Hard Mold)

11: guide roll 12: press roll

13: winding roll 14: slot die

100: base material layer 200: pattern layer

According to one aspect of the invention, (S1) supplying a curable resin composition to form a single layer layer; (S2) The single layer layer in which the nano pattern is transferred to the surface by passing the single layer layer formed in the step (S1) through a release mold having a nano pattern having a pitch of 50 to 500 nm and an aspect ratio of 1.0 to 5.0. Obtaining; And (S3) it can provide an optical sheet manufacturing method comprising the step of curing the single layer layer transferred to the nanopattern obtained in the (S2) step.

Conventionally, in the case of an optical sheet formed with a micro or nano pattern, a curable resin is coated on a substrate film (substrate layer) such as PET, PC, PMMA, TAC, COC, COP, and then patterned (pattern layer formation). As shown in FIG. 1, an interface between the base layer 100 and the pattern layer 200 may occur to cause light loss. As a result, the transmittance may be remarkably decreased or light reflection may occur frequently. In addition, in order to solve such a problem, a method of manufacturing an optical sheet having a structure of a single layer layer has been proposed by forming a pattern layer on a base layer and then removing the base layer, but a process of separating the base layer is required. The manufacturing process was so difficult that the practical application of the process was limited.

Furthermore, when the nanoscale pattern is transferred to the optical sheet, the surface area in which the curable resin is in contact with the mold increases, and the releasability with the mold is greatly reduced. Therefore, in the conventional case, the optical sheet having the nanopattern without the substrate layer may be implemented. It was very difficult.

However, through the present invention, it is possible to implement an inorganic type optical sheet having no base layer as shown in FIG. 2 by directly applying to a conventional pattern transfer process such as roll to roll without adding a cumbersome process. In addition, at the same time, a nanoscale pattern having a pitch of 50 to 500 nm and an aspect ratio of 1.0 to 5.0 can be formed on at least one surface.

As described above, the curable resin composition of the present invention has a weight average molecular weight of 100 to 100 to produce an optical sheet of an inorganic material type having a nanoscale pattern as in the present invention by applying an existing impregnation process. 100 parts by weight of a urethane acrylate of 30,000; And 75 to 250 parts by weight of a fluorine-containing siloxane-acrylate oligomer having a weight average molecular weight of 100 to 10,000 parts by weight based on the urethane acrylate.

In this case, in order to prevent excessive brittle or flexible when the optical sheet without a substrate is finally manufactured, each weight average molecular weight preferably satisfies the above range, and the weight average molecular weight May be a value measured using a method capable of measuring the molecular weight of the polymer, such as a matrix-assisted laser desorption ion mass spectrometer (MALDS) or gel permeation chromatography (GPC).

Particularly, in the present invention, the urethane acrylate is a main component included to provide durability of the optical sheet and reliability, flexibility, and support as a monolayer layer, such as curl or yellowing, and can secure the physical properties. It may be included in a ratio of 20 to 40% by weight based on the total weight of the curable resin.

In addition, in the present invention, the fluorine-containing siloxane-acrylate oligomer, as a main component participating in the curing reaction, has a molecular structure in which fluorine is substituted for siloxane-acrylate, which is very effective in increasing mold release property after curing. It can play an important role. In general, in the case of an optical sheet including a pattern, a silicone acrylate having a weight average molecular weight of 900 to 1,500 is used to give a mold release property with a mold. If you go to the nano-size, releasability is not very satisfactory. In addition, in some cases, a fluorine resin is used to secure release property, but in this case, the resin easily remains in the mold and contaminates the mold, making it difficult to secure repeatability.

 On the contrary, in the case of the present invention, by including the oligomer having a unique structure in which fluorine is substituted in the siloxane-acrylate as a main component, both releasability and repeat pattern can be secured. However, when the content of the fluorine-containing siloxane-acrylate oligomer is less than 75 based on 100 parts by weight of urethane acrylate, the releasing property and transfer rate may be reduced, resulting in pattern aggregation, and sufficient release property may be secured even at 250 parts by weight or less. Therefore, it may be desirable not to exceed 250 parts by weight in consideration of the unit price of fluorine.

Furthermore, in the present invention, the curable resin composition may further include 60 to 125 parts by weight of a diluent and 10 to 25 parts by weight of a polymerization initiator based on 100 parts by weight of urethane acrylate. In the present invention, the diluent may be added for the purpose of adjusting the viscosity of the resin, it may be preferable that the acrylate-based monomo. As both the diluent and the main component contain an acrylate monomer, radical polymerization occurs while the double bond of the vinyl group is broken, and a curing reaction may easily occur.

At this time, the content of the diluent preferably satisfies the above range in order to maintain the viscosity of the resin to 100 to 300cps. If the viscosity of the curable resin composition is less than 100 cps, the flowability of the composition during roll to roll imprinting may be too high, causing film thickness variation. If the viscosity is 300 cps, the composition penetrates between the nanopatterns, making it difficult to form patterning. It can be undesirable.

In the present invention, the polymerization initiator may be at least one selected from the group consisting of a phosphine oxide-based polymerization initiator, a propanone-based polymerization initiator, a ketone-based polymerization initiator, and a formate-based polymerization initiator, and the polymerization reaction occurs easily and is colored. Alternatively, in order to prevent a decrease in mechanical strength, the polymerization initiator is preferably added in an amount of 10 to 25 parts by weight based on 100 parts by weight of urethane acrylate.

In addition to this, the curable resin composition of the present invention may further include at least one additive selected from the group consisting of UV absorbers, UV stabilizers, color stabilizers, leveling agents, antioxidants, antifoaming agents, and antistatic agents. It is not limited.

On the other hand, the optical sheet of the present invention may be manufactured through a roll-to-roll process or a stamp process, more preferably through a roll-to-roll process. At this time, the roll-to-roll process, as shown in Figures 3 to 5, the two guide rolls 11, which are the axis, the release mold (1 and 2) and the curable resin composition formed with a nano-pattern to form a pattern on the optical sheet It may be to include a slot die 14 for supplying a sheet.

In the step (S1) in the present invention, the curable resin composition may be supplied to the slot die to form a single layer layer. When forming the monolayer layer, the thickness may be manufactured to 10 to 500㎛ by adjusting the line speed of the roll-to-roll system according to the intended use, but is not necessarily limited thereto. In this case, the single layer layer discharged from the slot die may be primarily cured before forming the nano pattern, but is not limited thereto.

The single layer layer formed in the step (S1) passes through a release mold in which a nano-pattern is formed (soft mold: 1 in FIGS. 3 and 5 and hard mold: 2 in FIGS. 4 and 5), and the pattern of the mold is formed in the single layer layer. The pattern may be formed by transferring to one or both surfaces (step S2). In this case, the pattern may be a microlens shape in which figures such as hemispheres, cylinders, triangular pyramids, square pyramids, etc. are repeated, or may be linear grids such as prisms and lenticulars, but is not limited thereto. However, the unit shape of the nanopattern in the cross section observed when the monolayer layer on which the pattern is formed is cut in the vertical direction is preferably a pitch of 50 to 500 nm and an aspect ratio of 1.0 to 5.0. As the pattern has a nano size in the above range, it is possible to mitigate the change in refractive index due to the fine concavo-convex structure.

In the present invention, the forming of the pattern on the monolayer layer (S2) is preferably performed by the step of temporarily hardening the monolayer layer with a light amount of 50 to 150mj / cm2 together with the pattern transfer. When preliminary curing (preliminary curing) is carried out by irradiating the resin composition with a light amount of 50 to 150mj / cm 2, when the pattern is released from the mold, pattern crushing or tearing of the layer can be prevented, and finally, the substrate is finally manufactured without a substrate. Curl characteristics and transmittance of the optical sheet can be secured. However, if the amount of light is less than 50mj / ㎠ at the time of hardening it is difficult to form a pattern without the substrate, or the Curl characteristics in the sheet may be worse, if it exceeds 150mj / ㎠, it is possible to form an inorganic material sheet However, mold release property and repeatability may be reduced.

In addition, the release mold in the present invention should not only be well released after the pattern is transferred to the single layer layer to be repeatedly used in the roll-to-roll process, it should be easy to clean. Accordingly, according to a preferred embodiment of the present invention, the release mold may be coated with one or more release agents selected from the group consisting of silicon, fluorine and teflon.

As a mold surface treatment method by a mold release agent, the method of immersing a mold main body in the dilute solution of a mold release agent, or the method of apply | coating a mold release agent or its diluted solution to the surface of the side in which the fine uneven structure of the mold main body was formed, Since the surface of the side where the fine concavo-convex structure of the mold main body is formed can be treated with a release agent without nonuniformity, a method of immersing the mold main body in a dilute solution of the release agent is more preferable.

Subsequently, 150mj / cm ² to the single layer layer in which the nanopattern is formed by the step (S2). As described above, preferably, the light amount of 150 to 1,000 mj / cm ² may be irradiated, and thus, an inorganic material type optical sheet including a nanopattern may be finally manufactured (step S3). Here, if the amount of irradiated light is less than 150mj / cm ² may cause uncured and there is a problem in reliability, if more than 1,000 mj / cm ² may be brittle due to over-hardening (Brittle) may affect the handling problems or reliability have. However, the amount of light is not necessarily limited thereto, and in the roll-to-roll system during curing, light quantity and degree of curing may be optimized in consideration of line speed.

The optical sheet of the present invention thus produced may have a transmittance of 95% or more when irradiated with 550 nm light, and a curl value at 23 ° C. may be 0 mm to 2.0 mm. By the optical sheet having the optical properties and physical properties described above, the present invention can provide an inorganic type optical sheet having improved transmittance and stable reliability compared to the optical sheet including the base layer.

Hereinafter, the present invention will be described in more detail with reference to Examples. These examples are only for illustrating the present invention more specifically, and the present invention is not limited thereto.

Example  One

50% by weight of the fluorine-containing siloxane acrylate oligomer having a weight average molecular weight of 5,500 which is the main compound, 20% by weight of polyurethane acrylate having a weight average molecular weight of 1,800, as a diluent 1,6-exothiol diacrylate A curable resin composition having a viscosity of 150 cps was prepared by mixing 25 weight% of (1,6-hexandiol diacrylate) and 5 weight% of 1-hydroxy-cyclohexylphenyl-ketone as a polymerization initiator. 3 and 4, a release mold (Sokken Co., Ltd.) was supplied to a roll-to-roll system provided only on one side of the sheet to prepare an inorganic type optical sheet including a nanopattern in the following manner.

(S1) step: The curable composition prepared above was supplied to a slot die of a roll-to-roll system, and a monolayer layer having a thickness of 75 μm was formed through the slot die (14).

(S2) step: The monolayer layer formed by the step (S1) is supplied to a release soft mold (Fig. 1) having a nanoprism pattern having a pitch of 100 nm and an aspect ratio of 3.5, and transferred to a pattern while transferring the pattern onto one surface of the monolayer layer. Moth-eye structural patterns were formed. In addition, temporary curing was performed by irradiating UV of 100 mj / cm 2 light amount during pattern transfer.

(S3) step: The optical sheet including the nanopattern was finally prepared by UV curing the single layer layer having the pattern formed by the step (S2) to a light amount of 500mj / cm 2.

Example  2

In the step (S2) as shown in Figure 5 below, except that the same pattern as Example 1 on the both sides of the single layer layer (up and down pattern is the same), the optical sheet including the nano-pattern in the same manner as in Example 1 Prepared.

Example  3

An optical sheet including a nanopattern was manufactured in the same manner as in Example 1, except that the amount of light during temporary curing in step (S2) was changed to 50 mj / cm 2.

Example  4

An optical sheet including a nanopattern was manufactured in the same manner as in Example 1, except that the amount of light during temporary curing in step (S2) was changed to 150 mj / cm 2.

Example  5

An optical sheet including a nanopattern was prepared in the same manner as in Example 1 except that 30 wt% of a fluorine-containing siloxane acrylate oligomer and 40 wt% of urethane acrylate were added.

Comparative example  One. Base layer  Nano pattern containing Optical sheet  Produce

Using the same curable composition as in Example 1, except that the step of applying the curable composition to a thickness of 25㎛ on the substrate layer using a PET film (KOLON, 50㎛) as a base layer in step (S1) And the same method as in Example 1 was always applied to prepare a nano-pattern optical sheet having a base layer.

Comparative example  2. Temporary hardening  Omit process

Using the same curable composition as in Example 1, but tried to omit the temporary curing in the step (S2), but the phenomenon that the curable composition is entangled in the mold was not possible to manufacture as a sheet.

Comparative example  3. Temporary hardening  Changing the light condition Inorganic materials  type Optical sheet  Produce

An optical sheet including a nanopattern was prepared in the same manner as in Example 1, except that the same curable composition as in Example 1 was used, except that the amount of light was temporarily changed to 45 mj / cm 2 at step S2. .

Comparative example  4. Temporary hardening  Changing the light condition Inorganic materials  type Optical sheet  Produce

An optical sheet including a nanopattern was prepared in the same manner as in Example 1, except that the same curable composition as in Example 1 was used, except that the amount of light was temporarily changed to 160 mj / cm 2 at step S2. .

Comparative example  5. Composition ratio of curable composition is different Inorganic materials  type Optical sheet  Produce

An inorganic optical sheet including a nanopattern was manufactured in the same manner as in Example 1, except that 10 wt% of the fluorine-containing siloxane acrylate oligomer and 60 wt% of the urethane acrylate were added.

Comparative example  6. Different composition of curable composition Inorganic materials  type Optical sheet  Produce

An inorganic optical sheet including a nanopattern was manufactured in the same manner as in Example 3, except that 30 wt% of polysiloxane acrylate (Miwon Co., Ltd.) having a molecular weight of 1,100 was added instead of the fluorine-containing acrylate oligomer.

Comparative example  7. Composition and ratio of composition of curable composition are different Inorganic materials  type Optical sheet  Produce

An inorganic optical sheet including a nanopattern was manufactured in the same manner as in Example 3 except that 10 wt% of polysiloxane acrylate (Miwon Co., Ltd.) was further added and 30 wt% of urethane acrylate was added.

Comparative example  8. Normal Having composition  With curable composition Inorganic materials  type Optical sheet  Produce

An inorganic optical sheet including a nanopattern was prepared in the same manner as in Example 1 except that only 70 wt% of the urethane acrylate was added without adding a fluorine-containing acrylate acrylate oligomer or polysiloxane acrylate. The composition stuck to the mold and pattern formation was impossible.

The compositions of the curable compositions used to prepare the optical sheets of Examples 1 to 5 and Comparative Examples 1 to 8, respectively, are summarized as Table 1 below.

	Examples 1-4 and Comparative Examples 1-4	Example 5	Comparative Example 5	Comparative Example 6	Comparative Example 7	Comparative Example 8
Compound A 1)	50	30	10	-	30	-
Compound B 2)	-	-	-	30	10	-
Compound C 3)	20	40	60	40	30	70
Thinner 4)	25	25	25	25	25	25
Curing agent 5)	5	5	5	5	5	5

1) Compound A: Fluorine-containing siloxane acrylate oligomer

2) Compound B: Polysiloxane Acrylate

3) Compound C: Urethane Acrylate

4) Diluent: (1,6-Hexandiol diacrylate)

5) Hardener: (1-Hydroxy-cyclohexylphenyl-Ketone)

In addition, among Examples 1 to 5 and Comparative Examples 1 to 8, except that Comparative Example 2 (not performing the hardening) and Comparative Example 8 (using a normal composition) that the pattern formation itself was impossible, The release property, light transmittance, and curl properties were measured by the method, and the results are shown in Table 2.

< Measurement example >

Transcription rate (release) and repeat reproducibility measurements

The release property is already seen as a defect in appearance if no transfer occurs in the mold after prism or pattern after mold removal. When visually recognized, it was unconditionally NG (Not Good), and SEM analysis showed that the pattern transfer rate after release was more than 90%. In addition, if the transfer rate of the optical film is maintained at the same level during five consecutive transfers, it was determined that the repeatability is excellent.However, if the transfer rate drops more than 20% due to contamination of the mold surface as a result of five consecutive operations, the repeatability is repeated. It was judged that this was bad.

Light transmittance measurement

The sheets were cut into 5 cm * 5 cm, respectively, and then analyzed for transmittance based on a wavelength of 550 nm using a spectrophotometer (model name CM-3600) analyzer.

Curl property measurement

Reliability test was performed for 1,000 hours at 65 ° C. and 85% humidity, and then the specimens were allowed to stand at room temperature (23 ° C.) for 1 hour, and the curl was measured with a steel ruler or a Gab gauge.

	Base layer presence	Pattern formation	Transcription rate	Repeat reproducibility (5 times)	Light transmittance (%, 550 nm)	Curl (nm)
Example 1	X	section	Good	Good	96.5	0.5 or less
Example 2	X	both sides	Good	Good	99.5	0.5 or less
Example 3	X	section	Good	Good	96.1	0.5 or less
Example 4	X	section	Good	Good	95.7	0.5 or less
Example 5	X	section	Good	Good	96.4	0.5 or less
Comparative Example 1	O	section	Good	Good	94.5	2.5mm
Comparative Example 2	The composition sticks to the mold and cannot be manufactured in the form of an inorganic sheet
Comparative Example 3	X	section	Good	Good	96.1	2.2 mm
Comparative Example 4	X	section	Mold Release X	X	95.7	0.5 or less
Comparative Example 5	X	section	Poor (Plumping Patterns)	Not measurable	90.1	0.5 or less
Comparative Example 6	X	section	Bad	Not measurable	Not measurable	Not measurable
Comparative Example 7	X	section	usually	Bad	96.2	0.5 or less
Comparative Example 8	The composition sticks to the mold and cannot be manufactured in the form of an inorganic sheet

As can be seen in Table 2, in Examples 1 to 5, the transfer rate, repeatability, light transmittance and Curl characteristics were all excellent, in particular, light transmittance when compared with Comparative Example 1 having a base layer And it turned out that a curl characteristic is improved significantly. In addition, as can be seen from the results of Comparative Examples 3 and 4, when the amount of light is less than 50 mj / ㎠ at the time of curing, it was found that the Curl characteristics deteriorated, when the amount of light exceeds 150 mj / ㎠, the inorganic material It was confirmed that the mold release property is poor but it inhibits productivity.

On the other hand, in the composition of the curable composition, when the addition amount of the fluorine-containing siloxane acrylate oligomer is less than 30% by weight of the total composition, as in Comparative Example 5, agglomeration of the pattern occurs to form a precise nanopattern, thereby It was confirmed that the light transmittance significantly decreased. In the case of Comparative Example 6, in which general polysiloxane acrylate containing no fluorine was added instead of the fluorine-containing acrylate acrylate oligomer, releasability was remarkably reduced, so that no nanopattern was realized. As in Comparative Example 7, fluorine-containing siloxane acrylic Although the amount of the rate oligomer may be more than 30% by weight, the degree of transfer may be possible when the polysiloxane acrylates are mixed together, but the relatively low fluorine content may result in poor repeatability, and consequently, may not be applied to the mass production process system. It was found to be inappropriate.

Claims (10)

1. (S1) supplying a curable resin composition to form a single layer layer;

   (S2) The single layer layer in which the nano pattern is transferred to the surface by passing the single layer layer formed in the step (S1) through a release mold having a nano pattern having a pitch of 50 to 500 nm and an aspect ratio of 1.0 to 5.0. Obtaining; And

   (S3) The optical sheet manufacturing method comprising the step of curing the monolayer transferred to the nanopattern obtained in the step (S2).
2. According to claim 1, wherein the curable resin composition in (S1) is a weight average molecular weight of 100 to 30,000 urethane acrylate 100 parts by weight; And 75 to 250 parts by weight of a fluorine-containing siloxane-acrylate oligomer having a weight average molecular weight of 100 to 10,000 based on 100 parts by weight of the urethane acrylate.
3. The optical sheet manufacturing method of claim 2, wherein the curable resin composition (S1) further comprises 60 to 125 parts by weight of a diluent and 10 to 25 parts by weight of a polymerization initiator based on 100 parts by weight of urethane acrylate.
4. The method of manufacturing an optical sheet according to claim 1, wherein the curable resin composition in (S1) has a viscosity of 100 to 300 cps.
5. The optical sheet manufacturing method of claim 1, wherein the step (S2) includes a step of temporarily curing the monolayer layer with a light amount of 50 to 150mj / cm 2 while transferring the nanopattern.
6. The method of claim 1, wherein the release mold is coated with at least one release agent selected from the group consisting of silicon, fluorine, and teflon.
7. 100 parts by weight of a urethane acrylate having a weight average molecular weight of 100 to 30,000; And a fluorine-containing siloxane-acrylate oligomer having a weight average molecular weight of 100 to 10,000 parts by weight based on 100 parts by weight of the urethane acrylate, and formed from a curable composition comprising 75 to 250 parts by weight,

   An optical sheet comprising a plurality of nanopatterns having a pitch of 50 to 500 nm and an aspect ratio of 1.0 to 5.0 on at least one surface.
8. The optical sheet according to claim 7, wherein the optical sheet has a transmittance of 95% or more when irradiated with 550 nm light.
9. The optical sheet of claim 7, wherein the optical sheet has a curl value of 0 to 2.0 mm at 23 ° C.
10. 8. The optical sheet of claim 7, wherein the optical sheet is manufactured by the method of any one of claims 1 to 6.

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