KR101924444B1 - Panel for controlling transmission of light, method of manufacturing the same, and smart blind comprising the same - Google Patents

Abstract

The light transmittance control panel includes a sequentially stacked base layer, a silicone-based adhesive layer, and a polarizing film. Wherein the silicone adhesive layer comprises 20 to 70 parts by weight of an MQ resin having a hydroxyl group, based on 30 to 80 parts by weight of a vinyl-containing polydimethylsiloxane; And 1 to 10 parts by weight of a polydimethylsiloxane having a hydrogen group.

Description

TECHNICAL FIELD [0001] The present invention relates to a panel for adjusting light transmission, a method of manufacturing the same, and a smart blind including the same. BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a panel for adjusting light transmission, a method of manufacturing the panel, and a smart blind including the panel.

A blind, which is a functional device for windows and interiors, is for controlling light transmission and shielding, and may include one or more panels capable of blocking light, and the arrangement and / or angle of the panel may be mechanically controlled Light can be transmitted or blocked. Alternatively, the blind may be manufactured to be capable of adjusting the transmittance of light electrically using a liquid crystal device, electrochromic or the like, and in this case, the light transmittance can be adjusted continuously or stepwise according to voltage application.

However, blinds manufactured using a liquid crystal device or an electrochromic device require a power supply, so that electric wiring work is inevitable, high cost is required for installation, and it is difficult to immediately change the light transmittance, which may be inconvenient to use. Also, blinds that include panel (s) capable of blocking light may be substantially difficult to completely block light and may easily deteriorate, depending on the shielding performance and / or durability of panel (s).

Therefore, it may be difficult to easily control light transmission and shielding effectively with conventional blinds.

Korean Patent Laid-Open No. 10-2012-0104435 Korean Patent No. 10-1110534 Japanese Patent No. 4678847 Japanese Laid-Open Patent Application No. 1995-305448

It is an object of the present invention to provide a panel for controlling light transmission, which has excellent durability and is not at least partially peeled off or separated, has improved dimensional stability and does not cause light leakage, and is easy to manufacture, and a method for manufacturing the panel.

Another object of the present invention is to provide a smart blind which is capable of effectively controlling light transmission and shielding effectively without any electric device or equipment, has improved durability and dimensional stability, is excellent in performance, is not easily deteriorated, and is easy to manufacture .

According to exemplary embodiments of the present invention, a panel for adjusting light transmission includes a substrate layer, a silicon-based adhesive layer formed on the base layer, and a polarizing film formed on the silicon-based adhesive layer. Wherein the silicone adhesive layer comprises 20 to 70 parts by weight of an MQ resin having a hydroxyl group, based on 30 to 80 parts by weight of a vinyl-containing polydimethylsiloxane; And 1 to 10 parts by weight of a polydimethylsiloxane having a hydrogen group.

In exemplary embodiments, the silicone-based adhesive layer may comprise a 3: 7 to 8: 2 ratio of polydimethylsiloxane having a vinyl group and MQ resin having a hydroxy group.

In exemplary embodiments, the silicone-based adhesive layer may further include an adhesion-promoting agent. Wherein the silicone-based pressure-sensitive adhesive layer comprises 30 to 40 parts by weight of an MQ resin having a hydroxyl group, relative to 60 to 70 parts by weight of a vinyl-containing polydimethylsiloxane; 1 to 5 parts by weight of a polydimethylsiloxane having a hydrogen group; And 1 to 20 parts by weight of the adhesion promoting agent.

In exemplary embodiments, the adhesion promoter may be one or more selected from tetra (trimethylsiloxy) silane and (3-glycidoxypropyl) trimethoxysilane.

In exemplary embodiments, the silicone based adhesive layer may have an adhesion of greater than about 90 gf / 25 mm to about 120 gf / 25 mm.

In exemplary embodiments, the substrate layer may be a substrate film, glass or plastic.

A method of manufacturing a panel for adjusting light transmission according to exemplary embodiments for achieving another object of the present invention includes: forming a silicone-based adhesive layer on a base layer using a silicone-based pressure-sensitive adhesive composition; And bonding the polarizing film to the base layer using the silicone-based adhesive layer. The silicone-based pressure-sensitive adhesive composition may comprise 20 to 70 parts by weight of an MQ resin having a hydroxyl group, based on 30 to 80 parts by weight of a vinyl-containing polydimethylsiloxane. And 1 to 10 parts by weight of a polydimethylsiloxane having a hydrogen group.

In exemplary embodiments, the silicone-based adhesive layer can be prepared by applying the silicone-based pressure-sensitive adhesive composition onto the base layer through a coating process, and drying and curing the applied composition.

In exemplary embodiments, the polarizing film and / or the panel for adjusting light transmission can be cut through a die cutting process.

According to another exemplary embodiment of the present invention, a smart blind includes a first panel and a second panel opposite the first panel. At this time, when the first panel and the second panel have different polarizing directions and are overlapped, light is blocked, and if they are not overlapped, light is transmitted.

In exemplary embodiments, the first panel and / or the second panel may move in a first direction and a second direction opposite to the first direction and may be at least partially overlapping or non-overlapping.

In exemplary embodiments, the smart blind may further include a third panel opposing the first panel and the second panel. The third panel is fixed and at least partially overlaps the first and second panels, and may have one or more polarization directions.

In exemplary embodiments, the third panel may include a first region having the same polarization direction as the first panel, and a second region having the same polarization direction as the second panel.

The light transmission control panel according to the exemplary embodiments of the present invention may include a polarizing film to have a polarizing characteristic, and may include a silicone-based adhesive layer between the base layer and the polarizing film to have improved durability.

More specifically, the silicone-based pressure-sensitive adhesive layer has not only an appropriate adhesive force but also excellent wettability, re-releasability and adhesion, so that the base layer and the polarizing film are not peeled off or separated at least partly without occurrence of bubbles between them Can be effectively combined for a long time. In addition, since the silicone adhesive layer has excellent wettability and re-peelability, workability is improved and the light transmission control panel can be easily manufactured.

Further, the panel for controlling light transmission may be manufactured through a cutting process of a die-cutting type, thereby having improved dimensional stability.

Therefore, it is possible to realize a smart blind, which is not easily deteriorated and can control the transmission and shielding of light effectively and easily without using an electric device or a facility by using the panel for controlling light transmission.

1 is a cross-sectional view of a panel for adjusting light transmission according to exemplary embodiments.
2A is a perspective view of a smart blind according to exemplary implementations.
FIG. 2B is a perspective view showing the arrangement of the respective panels when the smart blinds transmit light according to exemplary embodiments. FIG.
Figure 3A is a perspective view of a smart blind according to exemplary implementations.
FIG. 3B is a perspective view illustrating the arrangement of the respective panels when the smart blind according to exemplary embodiments blocks light. FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

It is to be understood that the invention is not to be limited to the specific forms disclosed, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention, As will be understood by those skilled in the art.

As used herein, the term "reworkability" refers to a panel for controlling light transmission and a polarizing film attached to a substrate layer in the manufacture of a smart blind comprising the same. The polarizing film and / or substrate layer can be easily peeled off without causing damage or defects Quot; Workability can be improved as the pressure-sensitive adhesive layer for bonding the base layer and the polarizing film is excellent in wettability and re-peeling property.

Light transmission adjustment panel

A panel for controlling light transmission according to exemplary embodiments may constitute a blind, which is a device for polarizing and selectively transmitting or blocking light.

1 is a cross-sectional view of a panel for adjusting light transmission according to exemplary embodiments.

Referring to FIG. 1, the panel may include a substrate layer 10, a silicon-based adhesive layer 20, and a polarizing film 30 which are sequentially laminated.

The substrate layer 10 may not be opaque to allow light to pass through, and may preferably have transparency. The substrate layer 10 is not particularly limited as long as it can transmit light and can be combined with the polarizing film 30. For example, it may be a substrate film, glass, plastic, or the like. At this time, the base film may be formed of a polyester resin such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT) or the like, a polyimide resin, a polycarbonate resin, polystyrene resin, polyamide resin, polyester ether resin, and the like.

The silicone-based adhesive layer 20 is for bonding the polarizing film 30 and the base layer 10, and may include a silicone resin, a curing agent, and an MQ resin having a hydroxy group. The silicone adhesive layer 20 can have an adhesive strength of, for example, greater than about 90 gf / 25 mm to about 120 gf / 25 mm and is excellent in wettability as well as re- ) Can be effectively combined without bubbles.

The silicone resin is a subject of the silicone adhesive layer 20 and may be, for example, a vinyl terminated polydimethylsiloxane having a vinyl group. Polydimethylsiloxane having a vinyl group is a polymer in the form of a gum having a long chain having a molecular weight of several hundreds of thousands to several millions for softening so that it can be applied as an adhesive layer while grabbing a relatively hard solid phase MQ resin.

The curing agent may be one in which a functional group of a hydrogen group alone is attached to the chain of the siloxane, and preferably a hydrogen terminated polydimethylsiloxane having a hydrogen group.

The hydroxy-terminated MQ resin (hydroxy terminated MQ-resin) can impart adhesion to the silicone-based adhesive layer 20. The adhesive strength of the silicone adhesive layer 20 can be controlled according to the content of the MQ resin having a hydroxy group, and accordingly, the silicone adhesive layer 20 having excellent wettability can be realized.

In the exemplary embodiments, the silicone-based adhesive layer 20 is prepared by mixing 30 to 80 parts by weight of a vinyl-containing polydimethylsiloxane with an MQ resin 20 having a hydroxyl group, in consideration of both adequate adhesion, improved wettability and re- To 70 parts by weight; And 1 to 10 parts by weight of a polydimethylsiloxane having a hydrogen group.

The respective contents of the polydimethylsiloxane having a vinyl group and the MQ resin having a hydroxy group can be relatively controlled. When the content of the polydimethylsiloxane having a vinyl group is too small relative to the content of the MQ resin having a hydroxy group, that is, Is contained in a ratio of less than about 3: 7, the silicone-based adhesive layer 20 can have an excessively strong adhesive force of more than 120 gf / 25 mm, and the wettability may be greatly deteriorated have. As a result, the base layer 10 and the polarizing film 30 can be bonded together with a large amount of bubbles therebetween, and it is also practically impossible to re-peel, which makes it difficult to effectively bond.

Thus, the polydimethylsiloxane having a vinyl group and the MQ resin having a hydroxy group may be included in a ratio of about 3: 7 to 8: 2, and preferably in a ratio of about 5: 5 to 7: 3 .

Further, the silicone-based pressure-sensitive adhesive layer 20 may further include an adhesion-improving agent.

The adhesion promoter may be tetra (trimethylsiloxy) silane, (3-glycidoxypropyl) trimethoxysilane, etc., and at least one selected from the group consisting of Can be included in the silicone-based adhesive layer 20. Such an adhesion promoting agent can contribute to further enhance adhesion between the base layer 10 and the polarizing film 30 so that they are not at least partially peeled or separated.

In the exemplary embodiments, the silicone-based adhesive layer 20 may further comprise 30 to 40 parts by weight of an MQ resin having a hydroxyl group, based on 60 to 70 parts by weight of the vinyl-containing polydimethylsiloxane, ; 1 to 5 parts by weight of a polydimethylsiloxane having a hydrogen group; And 1 to 20 parts by weight of the adhesion promoting agent. Preferably, in one embodiment, the silicone-based adhesive layer 20 comprises 30 to 40 parts by weight of an MQ resin having a hydroxyl group, relative to 60 to 70 parts by weight of a vinyl-containing polydimethylsiloxane; 1 to 5 parts by weight of a polydimethylsiloxane having a hydrogen group; 1 to 10 parts by weight of tetra (trimethylsiloxy) silane; And 1 to 10 parts by weight of (3-glycidoxypropyl) trimethoxysilane.

Further, in the exemplary embodiments, the silicone-based adhesive layer 20 may further include a catalyst and a solvent.

The catalyst may comprise conventional catalysts such as platinum (Pt).

The solvent may be, for example, ethyl acetate or a mixture of toluene and methyl ethyl ketone.

On the other hand, the silicone adhesive layer 20 may have a thickness of, for example, about 10 to 80 占 퐉 in order to have an appropriate adhesive force. In one embodiment, the silicone adhesive layer 20 may preferably have a thickness of about 75 占 퐉.

The polarizing film 30 is not particularly limited as long as it can impart the polarizing characteristic to the light transmission control panel, and various polarizing films that can be commonly used can be used.

As described above, the light transmission control panel according to the exemplary embodiments has a polarizing property including a polarizing film, and can have improved durability by including a silicone-based adhesive layer between the base layer and the polarizing film.

More specifically, the silicone-based pressure-sensitive adhesive layer has not only an appropriate adhesive force but also excellent wettability, re-releasability and adhesion, so that the base layer and the polarizing film are not peeled off or separated at least partly without occurrence of bubbles between them Can be effectively combined for a long time.

Therefore, it is possible to realize a blind which is not easily deteriorated and can effectively and easily control the transmission and shielding of light by using the panel for controlling light transmission.

Manufacturing method of light transmission control panel

A panel for adjusting light transmission according to exemplary embodiments of the present invention can be manufactured by performing the following processes.

A silicone-based pressure-sensitive adhesive layer is formed on the base layer to a thickness of about 10 to 80 탆 by using the silicone-based pressure-sensitive adhesive composition. The base layer and the silicone-based adhesive layer may be the same as described above.

In the exemplary embodiments, the silicone-based adhesive layer may be formed by applying the silicone-based pressure-sensitive adhesive composition onto the substrate layer through a coating process such as comma coating, slot die coating, Lt; RTI ID = 0.0 > 160 C < / RTI >

The silicone-based pressure-sensitive adhesive composition comprises 20 to 70 parts by weight of an MQ resin having a hydroxyl group, based on 30 to 80 parts by weight of a polydimethylsiloxane having the same composition as the silicone-based pressure-sensitive adhesive layer, And 1 to 10 parts by weight of a polydimethylsiloxane having a hydrogen group can be used.

Preferably, the silicone-based pressure-sensitive adhesive composition further comprises an adhesion-promoting agent, specifically 30 to 40 parts by weight of an MQ resin having a hydroxyl group, relative to 60 to 70 parts by weight of a vinyl-containing polydimethylsiloxane; 1 to 5 parts by weight of a polydimethylsiloxane having a hydrogen group; And 1 to 20 parts by weight of the adhesion promoting agent may be used. In one embodiment, the silicone-based pressure-sensitive adhesive composition comprises 30 to 40 parts by weight of an MQ resin having a hydroxyl group, based on 60 to 70 parts by weight of a vinyl-containing polydimethylsiloxane; 1 to 5 parts by weight of a polydimethylsiloxane having a hydrogen group; 1 to 10 parts by weight of tetra (trimethylsiloxy) silane; And 1 to 10 parts by weight of (3-glycidoxypropyl) trimethoxysilane may be most preferably used.

A polarizing film is laminated on the silicon-based adhesive layer, and the polarizing film is bonded to the base layer using the silicone-based adhesive layer.

In exemplary embodiments, the polarizing film may be cut to have a proper width and length in accordance with the size of a light transmission control panel to be implemented before being stacked on the silicon-based adhesive layer. At this time, the polarizing film may be cut by a horizontal cutting method or may be cut by a die cutting method using a pinch mold.

Alternatively, in other exemplary embodiments, the polarizing film is combined with the laminate and substrate layer, and then the formed laminate (panel for modifying the raw light transmission) is subjected to a horizontal cutting method or a die cutting it is possible to cut to the appropriate width and length according to the size of the light transmission adjustment panel to be implemented using a die cutting method.

As long as the polarizing film and / or laminate (panel for adjusting light transmittance to be processed) can be cut to a desired size, it can be cut through various methods without particular limitation, but when using a die cutting method, That is, cut to have the same width and length.

More specifically, in the case of cutting in the flat cutting method, the polarizing film and / or the laminated body is difficult to be cut in the same dimension width due to the panning phenomenon generated at the time of cutting, thereby securing dimensional stability of the light transmission adjusting panel It can be difficult. Particularly, when the polarizing film is combined with the base layer after cutting the polarizing film to a desired size using a flat cutting method, lifting may occur at an edge portion of the polarizing film combined with the base layer.

However, since the die cutting method is a press cutting (punching) type using pressure, it is possible to cut to a certain size without substantially deviating. In this case, when the cut polarizing film is used, (Adhered). Therefore, it is most preferable to use a die cutting method in order to realize a light transmission control panel having dimensional stability so that light leakage phenomenon does not occur.

As described above, it is possible to manufacture a panel for controlling light transmission having improved durability and dimensional stability through a cutting process of a silicone-based pressure-sensitive adhesive composition of a specific composition and a die cutting method. In particular, since the silicone-based adhesive layer having excellent wettability and re-releasability can be formed through the silicone-based pressure-sensitive adhesive composition, the base layer and the polarizing film can be easily bonded without bubbles, have. That is, since the workability in manufacturing can be improved through the silicone-based pressure-sensitive adhesive composition, the light transmission control panel capable of effectively controlling the transmission and shielding of light can be easily realized.

Smart blinds

A smart blind according to exemplary embodiments of the present invention includes at least two light transmission adjustment panels having different polarization characteristics and capable of relative movement, so that light transmission and shielding without electronic devices and / Which can be easily and effectively adjusted. The blinds may block light when two or more light transmission adjustment panels having different polarizing characteristics are superimposed, and may transmit light when they are not superimposed.

Figures 2a and 3a are perspective views of smart blinds in accordance with exemplary implementations. More specifically, FIG. 2A is a perspective view of the smart blind when light is transmitted, and FIG. 3A is a perspective view of the smart blind when blocking light.

2A and 3A, the smart blind may include a first panel 100, a second panel 200, and a third panel 300 facing each other, and the first panel 100, the second panel 100, And a support part 400 for supporting the panel 200 and the third panel 300. The first panel 100, the second panel 200, and the third panel 300 may be formed of the same light transmission control panels as those described above, that is, the same silicon based adhesive layer as described above, And may be panels for adjusting light transmission with a polarizing film attached (bonded) on one surface.

The first panel 100 may include a first polarizing film 105 having a first polarizing direction and the second panel 200 may include a second polarizing film having a second polarizing direction different from the first polarizing direction, (205). In addition, the first panel 100 and the second panel 200 may be supported through the support part 400 and be movable. In the exemplary embodiments, the first panel 100 and the second panel 200 may move transversely, i.e., in a first direction, and in a second direction opposite to the first direction.

Accordingly, the first panel 100 and the second panel 200 having different polarizations (polarization directions) may move relative to each other and at least partially overlap or not overlap each other. At this time, since the first polarizing direction and the second polarizing direction are mixed, the light can be blocked at the overlapping portion of the first panel 100 and the second panel 200, Light may be transmitted through the panel 100 and the second panel 200.

The smart blind can control transmission and shielding of light with only the first panel 100 and the second panel 200. However, in order to completely block the light, the third panel 300, as shown in FIGS. .

In the exemplary embodiments, the third panel 300 has a larger size than the first panel 100 and the second panel 200, specifically, the sum of the areas of the first panel 100 and the second panel 200 As shown in FIG. However, the relative size difference of the third panel 300 with respect to the first panel 100 and / or the second panel 200 is only an optimal configuration for completely blocking the light, 100, the second panel 200, and / or the third panel 300 are not particularly limited and may be variously modified. That is, although not shown, in other exemplary embodiments, the third panel 300 may have substantially the same size as the first panel 100 and / or the second panel 200, .

In the exemplary embodiments, the third panel 300 is supported through the support 400 and may be fixed, unlike the first panel 100 and / or the second panel 200. The third panel 300 may also include a first region having substantially the same polarization direction as the first panel 100 and a second region having substantially the same polarization direction as the second panel 200 . Specifically, the first region is a region to which a third polarizing film 303 having a third polarizing direction substantially equal to the first polarizing direction is attached, and the second region is substantially the same as the second polarizing direction And the fourth polarizing film 305 having the fourth polarizing direction is attached.

2B, when the first panel 100 is moved so as to overlap with the first area and the second panel 200 is moved so as to overlap with the second area, The smart blind can substantially completely transmit light because there is no mixed portion. Alternatively, as shown in FIG. 3B, when the second panel 200 is moved so as to overlap with the first area and the first panel 100 is moved so as to overlap with the second area, So that the smart blind can substantially completely block the light.

As described above, the smart blind according to exemplary embodiments includes a panel for adjusting the light transmission, which has a polarization characteristic and is capable of relative movement, so that it can be used without an electronic device such as a liquid crystal or an electronic device such as wiring, It is possible to easily control the transmission and shielding of light using only the physical force of the user. Therefore, the smart blind can be advantageous in terms of manufacturing and supply since no additional installation work or high cost is required.

Furthermore, since each panel (light transmission adjusting panel) constituting the smart blind has a form in which a polarizing film is attached (bonded) to one surface of a substrate layer such as glass through the silicone adhesive layer as described above , It has excellent durability and is not easily deteriorated, but also has an improved dimensional stability, so that light can be effectively transmitted and blocked.

In addition, since the silicone adhesive layer as described above has excellent wettability and re-releasability, even if the polarizing film is improperly adhered to the substrate layer, it can be easily peeled off and attached again, It may be easy to manufacture.

However, the present invention is not limited to this, and may be applied to a light-transmissive display panel including a substrate layer, a silicon-based adhesive layer, and a polarizing film as described above. It will be apparent to those skilled in the art that all blinds having a configuration for shielding or transmitting light by moving them relative to each other and functional devices for windows and interiors including the blinds are included in the scope of the present invention.

The present invention will be described in more detail through the following embodiments. It should be understood, however, that the embodiments of the present invention disclosed herein are for illustrative purposes only, and that the embodiments of the present invention may be embodied in various forms and should not be construed as limited to the embodiments set forth herein Can not be done.

[Examples and Comparative Examples]

(A) having a vinyl group, an MQ resin (B) having a hydroxyl group, a polydimethylsiloxane (C) having a hydrogen group and tetra (trimethylsiloxy) silane (D) The silicone-based pressure-sensitive adhesive composition containing the same composition was coated on the substrate layer, followed by drying and curing to form a silicone-based pressure-sensitive adhesive layer having a thickness of 75 탆. Thereafter, a polarizing film was laminated on the silicon-based adhesive layer, and a pressure was applied thereto to bond with the base layer, thereby fabricating a panel for controlling light transmission. On the other hand, Table 1 below shows MQ resin (B) having a hydroxyl group to the corresponding weight part of the vinyl-containing polydimethylsiloxane (A), polydimethylsiloxane (C) having a hydrogen group and tetra (trimethylsiloxy) silane (D).

(A) (B) (B) (D) Comparative Example 1 30 70 3 0 Comparative Example 2 30 70 3 1.5 Comparative Example 3 30 70 3 2.5 Comparative Example 4 30 70 3 4.5 Comparative Example 5 40 60 3 0 Comparative Example 6 40 60 3 1.5 Comparative Example 7 40 60 3 2.5 Comparative Example 8 40 60 3 4.5 Comparative Example 9 50 50 3 0 Comparative Example 10 50 50 3 1.5 Comparative Example 11 50 50 3 2.5 Comparative Example 12 50 50 3 4.5 Comparative Example 13 60 40 3 0 Comparative Example 14 60 40 3 1.5 Example 1 60 40 3 2.5 Example 2 60 40 3 4.5 Comparative Example 15 70 30 3 0 Comparative Example 16 70 30 3 1.5 Example 3 70 30 3 2.5 Example 4 70 30 3 4.5 Comparative Example 17 80 20 3 0 Comparative Example 18 80 20 3 1.5 Comparative Example 19 80 20 3 2.5 Comparative Example 20 80 20 3 4.5

Silicon system The adhesive layer  Adhesion evaluation

In order to evaluate the tackiness of the adhesive property of the silicone adhesive layer, the panels for adjusting the light transmission according to Examples and Comparative Examples were prepared with a sample size of 25 mm X 300 mm. At this time, the substrate layer and the polarizing film of each of the panels were rolled once and reciprocated once at a load of 2 kgf and a speed of 300 mm / min using an automatic pressing roller device. After that, after 30 minutes elapsed, The polarizing film was peeled from the base layer. The results are shown in Table 2 below.

Adhesion (gf / 25mm) Re-peelability Adhesion Comparative Example 1 1000 X ◎ Comparative Example 2 1000 X ◎ Comparative Example 3 1000 X ◎ Comparative Example 4 1000 X ◎ Comparative Example 5 140 X ◎ Comparative Example 6 140 X ◎ Comparative Example 7 140 X ◎ Comparative Example 8 140 X ◎ Comparative Example 9 120 △ △ Comparative Example 10 120 △ △ Comparative Example 11 120 △ ○ Comparative Example 12 120 △ ○ Comparative Example 13 105 ○ △ Comparative Example 14 105 ○ ○ Example 1 105 ○ ◎ Example 2 105 ○ ◎ Comparative Example 15 100 ○ △ Comparative Example 16 100 ○ ○ Example 3 100 ○ ◎ Example 4 100 ○ ◎ Comparative Example 17 90 ○ △ Comparative Example 18 90 ○ ○ Comparative Example 19 90 ○ ○ Comparative Example 20 90 ○ ◎

Silicon system The adhesive layer Re-peelability  evaluation

To evaluate the re-peeling property of the silicone adhesive layer, a polarizing film having a width of 15 to 30 mm and a length of 500 mm was attached to glass to prepare samples of light transmission control panels according to Examples and Comparative Examples, Peeling properties were confirmed by peeling the polarizing films of the samples by hand. The results are shown in Table 2 above.

X: It is difficult to remove polarizing film by hand.

△: The polarizing film can be peeled by hand, but the polarizing film and / or the appearance of each sample panel is deformed.

○: It is possible to remove the film by hand without causing distortion on the polarizing film and the appearance of each sample panel.

Evaluation of Adhesion between Conducted Adhesive Layer

To evaluate the adhesion of the silicone adhesive layer, a polarizing film having a width of 15 to 30 mm and a length of 500 mm was adhered to glass to prepare samples of the light transmission control panels according to Examples and Comparative Examples, Were placed in a thermo-hygrostat under the conditions of a temperature of 85 캜 and a humidity of 85% and left for 72 hours. Thereafter, appearance of each sample was observed to confirm whether deformation occurred, and adhesion between the base layer and the polarizing film was confirmed. The results are shown in Table 3 above.

?: No deformation occurred on the polarizing film and the appearance of each sample panel even after 72 hours of storage, and the polarizing film was not separated from the glass

○: After leaving for 72 hours, the polarizing film and the external appearance of each sample panel were not deformed, but a part of the polarizing film was separated from the glass.

?: Partial deformation occurred in the appearance of the polarizing film or each sample panel after being left for 72 hours, and the polarizing film was separated from the glass.

Ⅹ: The polarizing film and the appearance of each sample panel were largely deformed after leaving for 72 hours, and the polarizing film was separated from the glass.

Evaluation of Dimensional Stability of Panel for Controlling Light Transmission

In order to evaluate the dimensional stability of the light transmittance control panel, each sample of the light transmittance controlling panels according to the examples and the comparative examples was cut out by a flat cutting method and a die cutting method so as to have the same width length. Then, twenty samples were randomly selected from each of the samples prepared by the flat cutting method and each of the samples cut by the die cutting method, and the cut width deviation was measured. The results are shown in Table 3 below.

Further, in order to evaluate the dimensional stability of the panel for controlling light transmission, the polarizing film was cut by a flat cutting method and a die cutting method, and each of the cut polarizing films was attached to a grid paper using silicone adhesive layers of the same composition. Thereafter, the ratio of the areas occupied in the entire area attached to the grid paper was calculated, and the results are as shown in Table 4 below. At this time, the number of cells per unit area means the number of polarized polarized films attached on the grid paper.

Flat cutting method Die cutting method Cutting width deviation (mm) ± 0.7 to 1.0 mm ± 0.05 to 0.1 mm

Flat cutting method Die cutting method Number of cells per unit area (%) 38 to 47% 98 to 99%

Referring to Tables 3 and 4, it can be confirmed that the panel for light transmission adjustment has improved dimensional stability as it is manufactured by cutting through the die cutting method than by the flat cutting method.

Evaluation of workability of light transmission control panel

In order to evaluate the workability of the panel for controlling light transmission, the wettability and re-peelability of the silicone adhesive layer formed according to Examples and Comparative Examples were measured. As a new comparative example of these, the acrylic pressure- And an acrylic adhesive layer was formed between the polarizing film and the wettability and re-peelability. At this time, the wettability was measured by confirming how fast the adhesive composition for forming the adhesive layers was placed on the glass, the base film, and the plastic and adhered to the surface of the base material. In addition, re-releasability was measured by bonding the polarizing film to the glass, the base film and the plastic through the adhesive layers and confirming whether or not the polarizing film was peeled off from the substrates. The results are shown in Table 5 below.

Acrylic adhesive layer The silicone-based adhesive layer Wettability No wetting Good wettability Re-peelability Poor good

Referring to Table 5, it can be confirmed that the silicone-based adhesive layer has better wettability and re-peelability than the acrylic-based adhesive layer. Accordingly, it can be seen that the workability can be improved through the silicone-based adhesive layer and the panel for controlling light transmission can be easily manufactured.

10: substrate layer
20: Silicone adhesive layer
30: Light transmission control layer
100, 200, 300: first to third panels
105, 205, 303, 305: first to fourth polarizing films
400: Support

Claims (13)

A panel for adjusting light transmission,
A base layer;
A silicone-based adhesive layer formed on the base layer; And
And a die-cut polarizing film formed on the silicon-based adhesive layer,
Wherein the silicone-based pressure-sensitive adhesive layer comprises 30 to 40 parts by weight of an MQ resin having a hydroxyl group, relative to 60 to 70 parts by weight of a vinyl-containing polydimethylsiloxane; 1 to 5 parts by weight of a polydimethylsiloxane having a hydrogen group; And from 2.5 to 4.5 parts by weight of tetra (trimethylsiloxy) silane,
Wherein the silicone-based adhesive layer has an adhesive force of 100 gf / 25 mm to 105 gf / 25 mm. The method according to claim 1,
Wherein the silicone-based adhesive layer has a thickness of 10 to 80 占 퐉. delete delete delete The method according to claim 1,
Wherein the base layer is a base film, glass or plastic. A method of manufacturing a panel for adjusting light transmission according to any one of claims 1, 2, and 6,
Forming a silicone-based pressure-sensitive adhesive layer on a base layer using a silicone-based pressure-sensitive adhesive composition; And
And bonding the polarizing film to the base layer using the silicone-based adhesive layer. 8. The method of claim 7,
The silicone-based pressure-sensitive adhesive layer is formed by,
Coating the silicone-based pressure-sensitive adhesive composition on the base layer through a coating process, and drying and curing the applied composition. delete A smart blind comprising a panel for adjusting light transmission according to any one of claims 1, 2 and 6, wherein the smart blind
A first panel; And
And a second panel facing the first panel,
Wherein the first panel and the second panel intercept light when the first panel and the second panel have different polarizing directions, and transmit light when the first panel and the second panel do not overlap each other. 11. The method of claim 10,
Wherein at least one of the first panel and the second panel moves in a first direction and in a second direction opposite to the first direction and is not at least partially overlapped or overlapped. 11. The method of claim 10,
Wherein the smart blind further comprises a third panel facing the first panel and the second panel,
Wherein the third panel is fixed and at least partially overlaps the first panel and the second panel and has at least one polarization direction. 13. The method of claim 12,
The third panel
A first region having the same polarization direction as the first panel; And
And a second region having the same polarization direction as the second panel.

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