KR102046146B1 - Silicone release film with excellent stability in peeling force over time and optical display using the same - Google Patents

Abstract

The present invention relates to a silicon release film having excellent peeling stability over time and its use applied to an optical display device process.
The silicone release film of the present invention has a structure in which a silicone release layer is formed on a polyester film layer, and a change rate (X) between peeling forces after at least 14 days after initial peeling force is 0.8 ≦ X ≦ 2.5, and the thickness of the silicone release layer is (Y) satisfies 30 nm <Y <1200 nm. The silicone release film that satisfies the above properties has excellent peeling stability characteristics over time, and thus, even after being stored for a long time due to inventory or transportation after the silicone release layer and the adhesive lamination, the unpeeled phenomenon or the adhesive layer tearing phenomenon is reduced. The defect can be improved and the confusion such as overdetection and non-detection of defects that may be caused by the release film during the polarizing plate shipment inspection can be minimized due to the excellent appearance characteristics of the silicon release layer, which is the composition of the silicone release film.

Description

Silicone release film with excellent peeling stability over time {SILICONE RELEASE FILM WITH EXCELLENT STABILITY IN PEELING FORCE OVER TIME AND OPTICAL DISPLAY USING THE SAME}

The present invention relates to a silicone release film with excellent peeling stability over time, and more particularly, a silicone release film having a silicone release layer formed on a polyester film layer satisfies the excellent peeling stability over time relative to the initial peeling force, After the release layer and the pressure-sensitive adhesive lamination, even if stored for a long time due to inventory or transportation, such as un-peeled phenomenon, peeling phenomenon of the adhesive layer is reduced, the appearance defect is minimized silicone release film.

In general, a polarizing plate is a film that transmits only light that vibrates in a predetermined direction when light passes. The polarizing plate is not only used in a liquid crystal display (LCD) device but also used in a display device such as an organic light emitting diode (OLED). The polarizer manufacturing process is completed through at least one silicon release film using process.

Looking at the manufacturing process of the polarizing plate, the pressure-sensitive adhesive layer is formed on at least one surface of the polarizing plate protective film and the polarizing plate, the silicon release film is laminated on the adhesive layer and then transported and stored in a roll state.

After that, each laminated roll is cut into a desired size and put into a storage and manufacturing process. The conventional silicone release film is unreacted with the unreacted functional group of the silicone resin in the silicone release layer while being stored for a long time in a state of being laminated with the adhesive layer. Unreacted functional groups in the layer components react slowly, or due to entanglement between the polymer of the adhesive layer and the polymer of the silicone release layer, tearing may occur when peeling off the silicone release film, thereby causing damage to the adhesive layer. Can be.

In addition, due to the transition of the polymer and the unreacted compound of the silicone release layer to the pressure-sensitive adhesive layer, a quality problem may occur in which the adhesion decreases.

On the other hand, the inspection for quality defects in the manufacturing process as described above is managed as an important item inspection of foreign matters and appearance defects, and such foreign matters and appearance defects inspection is carried out by the visual inspection of the inspector, in addition to the size of the polarizing plate Problems such as foreign matters and defects of the release film may hinder accurate visual inspection of the polarizing plate and the polarizing plate protective film, which may result in overdetection and non-detection of quality problems of the polarizing plate.

In order to improve problems such as tearing phenomenon, adhesive layer damage, and appearance defects during peeling, a film having excellent peeling stability and appearance over time is required. In particular, in the case of the in-line release film, since the drying, curing and stretching process of the crude liquid is made at the same time, it is difficult to secure excellent seizure stability and excellent appearance.

Accordingly, the present inventors have tried to eliminate the tearing phenomenon when the pressure-sensitive adhesive and the silicone release film used in the conventional polarizing plate manufacturing due to the change over time, the thickness of the silicone release layer formed on the polyester film layer in the in-line manufacturing process. By optimizing and limiting the rate of change between the peeling forces after a certain period of time relative to the initial peeling force of the obtained silicone release film, the present invention was completed by providing a silicone release film having excellent peel stability and appearance over time.

An object of the present invention is to provide a silicone release film with excellent peel stability over time.

Another object of the present invention is to provide a use that is applied to the optical display device process because it is excellent in the appearance evaluation by minimizing the tearing phenomenon during peeling using a silicon release film with excellent peel stability over time.

The present invention comprises a silicone release layer formed by applying a silicone film-containing composition to the polyester film layer and at least one surface of the polyester film layer at least once, and satisfying the requirements of the following (1) and (2) Provide a film.

(1) 0.8 ≤ X ≤ 2.5

(2) 30 nm <Y <1200 nm

(In the above, X is the ratio between the aging peeling power / 1 day aging peeling after at least 14 days, Y is the thickness of the silicon release layer.)

In the above, the silicone release layer is formed by the silicone component-containing composition in which 1.2 to 15.0 wt% of the solid content of the silicone component is contained in the solvent.

More specifically, the silicone component-containing composition includes an alkenylpolysiloxane represented by the following formula (1).

Formula 1

(In the above, R ₁ , R ₂ and R ₃ is at least two or more selected from -CH = CH ₂ , -CH ₂ -CH ₂ -CH ₂ -CH ₂ -CH = CH ₂ or -CH ₃ in the molecule At least one alkenyl group is present, m and n are from 50 to 300.)

In addition, the silicone component-containing composition of the present invention preferably comprises 3.5 to 7.5 parts by weight of hydropolypolysiloxane based on 100 parts by weight of the alkenylpolysiloxane.

Furthermore, it is preferable that the silicone component containing composition of this invention contains 0.3-2.6 weight part of silane coupling agents with respect to 100 weight part of said alkenyl polysiloxanes.

Furthermore, it is preferable that the silicone component containing composition of this invention contains 0.2-1.2 weight part of polysiloxane surfactants with respect to 100 weight part of alkenyl polysiloxanes.

The silicon component-containing composition may further include 1,000 to 10,000 ppm of a platinum catalyst.

The present invention is an optical display device member applied to any one selected from the group consisting of a liquid crystal display, a plasma display, a personal digital assistant and navigation, an organic light emitting diode, and a polymer light emitting diode (Polymer Light Emitting Diodes). Provides use.

Moreover, this invention provides the use as a polarizing plate member to which the above silicone release film was applied to the polarizing plate.

Thus, the silicone release film of the present invention, due to the excellent aging stability characteristics over time, even if stored for a long time for reasons such as inventory or transportation after lamination with the adhesive, un-peeled phenomenon, tearing of the adhesive is reduced to improve the poor quality can do.

In the silicone release film made of the silicone release layer formed on the polyester film layer according to the present invention, the thickness of the silicone release layer formed on the polyester film layer is optimized in the in-line manufacturing process, and compared with the initial peeling force of the obtained silicone release film. After a certain period of time, the rate of change between the peeling forces is optimized, thereby satisfying excellent aging stability and appearance over time.

Therefore, even when the silicone release film of the present invention is stored for a long time due to stocking or transportation due to lamination with a pressure-sensitive adhesive during manufacturing of a polarizing plate, due to its excellent time-release peeling stability, unpeeled phenomenon or adhesive layer tearing phenomenon is reduced, resulting in poor quality. Can be improved.

In addition, due to the excellent appearance characteristics of the silicone release layer, which is a component of the silicone release film, it is possible to minimize confusion such as overdetection and non-detection of defects that may be caused by the release film during the polarizer shipment inspection.

Therefore, the silicon release film of the present invention is any one optical display device selected from the group consisting of liquid crystal display, plasma display, personal digital assistant and navigation, organic light emitting diodes (OLED), and polymer light emitting diodes (PLED). It can be usefully applied to the product process. In particular, it can apply to a polarizing plate protective film or a polarizing plate member use.

1 is a schematic cross-sectional view of a polarizing plate protective film to which the silicone release film of the present invention is applied,
2 is a schematic cross-sectional view of a polarizing plate member to which a silicone release film of the present invention is applied.

Hereinafter, the present invention will be described in detail.

The present invention comprises a silicone release layer formed by applying a silicone film-containing composition to the polyester film layer and at least one surface of the polyester film layer at least once, and satisfying the requirements of the following (1) and (2) Provide a film.

(1) 0.8 ≤ X ≤ 2.5

(2) 30 nm <Y <1200 nm

(In the above, X is the ratio between the aging peeling power / 1 day aging peeling after at least 14 days, Y is the thickness of the silicon release layer.)

In the silicone release film 1 of the present invention, the polyester film layer 10 is a base film, and can be used within the range known in the prior art as a base film of silicone release coating, without limitation to the kind thereof. At this time, the polyester film layer 10 as a base film can be used as long as it is a uniaxial or biaxially oriented film which has high transparency and is excellent in productivity and workability.

In the silicone release film 1 of the present invention, the silicone release layer 11 is formed by applying the silicone component-containing composition one or more times.

In this case, the silicone component-containing composition of the present invention is characterized in that it comprises an alkenylpolysiloxane, hydropolypolysiloxane, silane coupling agent, surfactant and a platinum chelate catalyst.

More specifically, the silicone component-containing composition contains alkenylpolysiloxane represented by the following general formula (1) as a main component.

Formula 1

(In the above, R ₁ , R ₂ and R ₃ is at least two or more selected from -CH = CH ₂ , -CH ₂ -CH ₂ -CH ₂ -CH ₂ -CH = CH ₂ or -CH ₃ in the molecule At least one alkenyl group is present, and m and n are integers from 50 to 300.)

The alkenylpolysiloxane may be of any type, such as addition type, condensation type, and ultraviolet curing type. The alkenylpolysiloxane may contain an alkenyl group in a molecule, and may be present in any part of the molecule, and at least two or more may be present. . The molecular structure may be linear or branched, or may be a structure in which both a linear and a branch are present.

In addition, the silicone component-containing composition of the present invention is one containing from 100 parts by weight of alkenylpolysiloxane, 3.5 to 7.5 parts by weight of the hydropolypolysiloxane represented by the following formula (2).

Formula 2

(In the above, p is 20 to 300 and q is 0 to 300.)

The hydropolypolysiloxane may be either linear, branched or cyclic as a curing agent in the silicone release composition, or a mixture thereof.

In addition, the hydropolypolysiloxane is not limited in viscosity and molecular weight, but should be compatible with the alkenyl polysiloxane, the amount of the hydroelectric polysiloxane is 1.0 to 2.0 hydroelectron bonded to the silicon atom for one alkenyl group of the alkenyl polysiloxane It is preferable to make it into a range. At this time, when the number of hydrogen atoms bonded to the silicon atom is less than 1.0 with respect to one alkenyl group of the alkenylpolysiloxane, there is a problem in that it is not possible to obtain satisfactory sclerosis, and when it exceeds 2.0, the problem that elasticity and physical properties after curing are lowered In addition, a problem arises in that the change in peel force with time increases due to the reaction between the residual hydroelectric and the adhesive layer.

Therefore, preferably, the hydrogel polysiloxane is included in an amount of 3.5 to 7.5 parts by weight based on 100 parts by weight of alkenylpolysiloxane. As a result, the flexibility is reduced to form a crack in the film, thereby reducing the smoothness.

The silicone component-containing composition of the present invention further contains 0.3 to 2.6 parts by weight of the silane coupling agent based on 100 parts by weight of the alkenylpolysiloxane.

The silane coupling agent is a material represented by the crosslinking role of the substrate and the coating film, and plays an important role of expressing solvent characteristics. As the component of the silane coupling agent, any of epoxy silane, amino silane, vinyl silane, methacryloxy silane, and isocyanate silane can be used, and one or two or more kinds thereof can be used.

In order to impart excellent wettability to the substrate in the constitution of the silicone component-containing composition of the present invention, 0.2 to 1.2 parts by weight of the polysiloxane surfactant represented by the following formula (3) is further included with respect to 100 parts by weight of the alkenylpolysiloxane.

Formula 3

(In the above, R ₁ is -CH ₃ , -CH ₂ CH ₃ ,-(CH ₂ ) ₉ CH ₃ , R ₂ is a polyether group, arylalkyl group, polyester group, acrylic group, carboxyl group or hydroxy group , x and y are 1 to 150, and the sum of x and y is 230 or less.)

The sum of x and y is preferably 230 or less. If it exceeds 230, the compatibility of the surfactant may be deteriorated and problems such as pinhole defects may occur.

In addition, the polysiloxane-based surfactant should have good compatibility with the alkenylpolysiloxane, and the amount of the polysiloxane-based surfactant preferably contains 0.2 to 1.2 parts by weight based on 100 parts by weight of the alkenyl polysiloxane.

In addition, the silicon component-containing composition of the present invention may further include 1,000 to 10,000 ppm of the platinum catalyst.

The above silicone component-containing composition is diluted to include 1.2 to 15.0% by weight of solids based on the total weight of the coating composition, and then coated on the polyester film layer. At this time, when the solid content is less than 1.2% by weight, pinholes may occur, or a uniform silicone coating layer may not be formed, and a problem such as tearing when peeling after laminating with the adhesive layer may occur. If it exceeds 15.0% by weight, blocking occurs between films, which may cause product appearance damage and high temporal peeling force change.

The solvent used in the coating composition is not limited as long as it can be applied to the polyester film by dispersing the solid content of the present invention, but preferably water is used.

In addition, the silicone release film (1) of the present invention is to be 1.0 to 1.5 times the surface tension of the polyester film layer compared to the silicone component-containing composition. In this case, when the surface tension of the base film is less than 1.0 compared to the silicone component-containing composition, the wettability of the entire coating solution is deteriorated, and when it is more than 1.5, an agglomeration phenomenon occurs in the coating solution and an external defect is expressed after curing of the coating layer.

Furthermore, the present invention is to form a silicone release layer formed on the polyester film layer on the in-line manufacturing process, more specifically, the in-line manufacturing process 1) uniaxially stretching the polyester film, 2) On one side or both sides of the uniaxially stretched polyester film, the silicone component-containing composition is applied to form a silicone release layer, and 3) the polyester film having the release layer is re-stretched to prepare a biaxially stretched polyester. It consists of doing

In the above, by optimizing the coating thickness of the silicon release layer in the production of the in-line type silicone release film, by limiting the rate of change between the peel force after a certain time after the initial release force of the obtained silicone release film, excellent time-lapse stability and excellent appearance To secure.

At this time, the obtained silicone release film satisfies the requirements of the following (1) and (2).

(1) 0.8 ≤ X ≤ 2.5

(2) 30 nm <Y <1200 nm

(In the above, X is the ratio between the aging peeling power / 1 day aging peeling after at least 14 days, Y is the thickness of the silicon release layer.)

In the method for producing a silicone release film of the present invention, step 1) of uniaxially stretching a polyester film will be described.

For the polyester film layer of the present invention, polyester-based resins such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate and the like have been described as an example, but it will be understood that the present invention is not limited thereto.

The said polyester film points out the polyester obtained by polycondensing aromatic dicarboxylic acid and aliphatic glycol, and aromatic dicarboxylic acid uses terephthalic acid, 2, 6- naphthalenedicarboxylic acid, etc. Isophthalic acid, phthalic acid, terephthalic acid, 2,6-naphthalenedicarboxylic acid, adipic acid, sebacic acid, oxycarboxylic acid (for example, P-oxybenzoic acid, etc.) can be used as a dicarboxylic acid component. The aliphatic glycols include ethylene glycol, diethylene glycol, 1,4-cyclohexanedimethanol, propylene glycol, butanediol, neopentyl glycol, and the like, and these dicarboxylic acid components and glycol components are each two kinds. You may use together the above.

Representative polyester films include polyethylene terephthalate (PET), polyethylene-2,6-naphthalenedicarboxylate (PEN), and the like, and copolymers containing a third component in the polyester may be used.

The polyester resin of the above-described configuration is melted by an extruder after vacuum drying, extruded into a sheet through a T-DIE, adhered to a casting drum by pinning to a cooling roll, and solidified by cooling to unstretched. A polyester sheet is obtained, and a uniaxially stretched polyester film is produced by performing a uniaxial stretching of 2.5 to 4.5 times by the circumferential speed ratio difference between the rolls in a roll heated above the glass transition temperature of the polyester resin. .

In the method for producing a polyester release film of the present invention, step 2) is a step of forming a release layer by applying the silicone component-containing composition of the present invention to one or both sides of the uniaxially stretched polyester film in step 1). More specifically, the method of applying the release coating composition may be performed by a method such as a meyer bar method or a gravure method, and by introducing a polar group on the surface of the film before application, Corona discharge treatment can be performed to improve the applicability.

The composition components and contents of the silicone component-containing composition of the present invention used in step 2) of the preparation method of the present invention are the same as described above.

In the method of manufacturing the polyester release film of the present invention, step 3) is a step of producing a biaxially stretched polyester film by re-stretching the polyester film on which the release layer is formed in step 2).

At this time, the stretching in step 3) is performed in the direction perpendicular to the uniaxial stretching direction, and the preferred stretching ratio is 3.0 to 7.0 times. After the stretching process, the polyester release film may be manufactured by heat setting, curing, and drying.

The thickness of the biaxially stretched polyester film produced from the production method of the present invention is 5 to 300 µm, preferably 10 to 250 µm.

Furthermore, the present invention applies the above silicon release film, but is applied to any one selected from the group consisting of liquid crystal display, plasma display, personal digital assistant and navigation, organic light emitting diodes and polymer light emitting diodes (Polymer Light Emitting Diodes) A use as a display device member is provided.

More specifically, the present invention provides a use as a polarizing plate member to which a silicone release film is applied.

1 is a schematic cross-sectional view of a polarizing plate protective film to which a silicone release film of the present invention is applied, wherein a silicone release film 1 including a polyester film layer 10 and a silicon release layer 11 laminated on one surface thereof is an adhesive layer ( 12) is combined with the antistatic layer 14 laminated on the base 13 to complete the polarizing plate protective film.

When the polarizing plate protective film is applied to a product, the silicone release film 1 of the present invention is peeled off. At this time, the silicone release layer 11 of the present invention elapses a long time after lamination with the adhesive layer 12. Even if it is not peeled off or the tearing phenomenon of the adhesive layer is minimized, it is possible to improve the problem of appearance defects. Therefore, it is possible to minimize the occurrence of overdetection and non-detection of confusion when the polarizer protective film shipment inspection.

FIG. 2 is a schematic cross-sectional view of a polarizing plate member to which the silicone release film of the present invention is applied, and the second polarizing plate 3 is formed on the back surface of the adhesive layer 12 from which the silicone release film 1 is peeled off in the polarizing plate protective film of FIG. 1. The second silicon release film 2 is bonded by the adhesive layer 22 to complete the polarizing plate member.

At this time, it will be understood that the second silicon release film 2 is made of the second polyester film layer 20 and the second silicon release layer 21 laminated on one surface thereof.

In this case, when the second silicon release film 2 is peeled off, the second silicon release layer 21 of the present invention is stored for a long time due to inventory or transportation after lamination with the second adhesive layer 22. Edo not peeled off, or tearing of the adhesive layer is minimized, it is possible to improve the problem of appearance defects. Therefore, it is possible to minimize the occurrence of overdetection and non-detection of confusion when the polarizer protective film shipment inspection.

Hereinafter, the present invention will be described in more detail with reference to Examples.

This is for explaining the present invention more specifically, but the scope of the present invention is not limited to these Examples.

<Example 1>

Step 1: Preparation of Monoaxially Stretched Polyester Film

Polyethylene terephthalate pellets having an ultimate viscosity of 0.625 μg / g containing 20 ppm of amorphous spherical silica particles having an average particle diameter of 2.5 μm were sufficiently dried at 160 ° C. for 7 hours using a vacuum dryer, and then melted and extruded. -Adhesive to the cooling drum through the die by an electrostatic application method to form an amorphous unstretched sheet, and heated again to perform 3.5 times stretching in the direction of film advancement at 95 ℃ to prepare a uniaxially stretched polyester film. Thereafter, a corona discharge treatment was performed on the surface of the film to be coated to prepare a polyester film.

Step 2: Preparation of Biaxially Stretched Polyester Film

Alkenyl polysiloxane represented by the general formula (1) on the treated side of the polyester film to corona discharge _{(R 1, R 2 = -CH} = CH 2, R 3 = -CH 3) , relative to 100 parts by weight of a silane coupling agent, 1.0 part by weight , 2.5 parts by weight of hydropolypolysiloxane (p = 100 _, q = 0) represented by Formula 2, a polysiloxane surfactant represented by Formula 3 (R ₁ = -CH _3, R ₂ = carboxyl group, x = 110, y = 50) ) 0.3 parts by weight, 50 ppm of a platinum chelate catalyst was diluted in water to apply a silicon component-containing composition having a total solid content of 2% by weight to form a silicon release layer having a thickness of 40 nm. Thereafter, the coating liquid applied in the 105 to 140 ℃ tenter section is dried, stretched 3.5 times in the direction perpendicular to the traveling direction of the film, and heat treated at 200 to 250 ℃ for 4 seconds to produce a 25 탆 thick biaxially stretched polyester release film. Prepared.

<Example 2>

A silicone release film for a polarizing plate member was manufactured by the same method as Example 1, except that the silicone component-containing composition was applied to form a silicon release layer in a thickness of 100 nm.

<Example 3>

A silicone release film for a polarizing plate member was manufactured by the same method as Example 1, except that the silicone component-containing composition was applied to form a silicon release layer in a thickness of 300 nm.

<Example 4>

A silicone release film for a polarizing plate member was prepared in the same manner as in Example 1, except that the silicone component-containing composition was applied to form a silicon release layer in a thickness of 800 nm.

<Examples 5 to 8>

A silicone release film for a polarizing plate member was manufactured in the same manner as in Example 1, except that the silicone component-containing composition containing the compound shown in Table 1 was used.

Comparative Example 1

A silicone release film for a polarizing plate member was manufactured by the same method as Example 1, except that the silicone component-containing composition was applied to form a silicon release layer in a thickness of 30 nm.

Comparative Example 2

A silicone release film for a polarizing plate member was prepared in the same manner as in Example 1, except that the silicone component-containing composition was applied to form a silicon release layer having a thickness of 1,200 nm.

Experimental Example 1 Measurement of Peel Force

Sample preparation: ① Preserve the silicon-coated measurement sample at 25 ° C and 65% RH for 24 hours. ② Attach the standard adhesive tape (TESA7475) to the silicon-coated side and attach the sample at room temperature (25 ° C). After 1 day and 14 days of compression under the load of the physical properties were measured using a measuring instrument (chem. Instrument AR-1000).

Measuring method: ① 180 ° peeling angle, Peeling speed 12 in / min, ② Sample size 500 × 1,500mm, Peel force measuring size 250 × 1,500mm

Measurement data calculation: The peel force unit was g / in, and the measured value was measured 5 times and the average value was computed.

Experimental Example 2 Measurement of Coating Thickness

With respect to the silicone release films prepared in Examples and Comparative Examples, the film with the silicone release layer was cut into a cross section, and the thickness with which the silicone release layer was formed was measured using a measuring device (Tecnai G2 F20 S-TWIN). .

Experimental Example 3 Observation of Appearance Defects

The silicon release layer surface prepared in Examples and Comparative Examples was visually observed using various light sources such as fluorescent, halogen, and incandescent lamps.

As a result of visual observation, when bluish appearance defects (1mm × 3mm ~ 3mm × 9mm) in the 5cm × 5cm area of the silicon release layer are observed from 0 to 15, mark ◎, and if 16 ~ 25 appearance defects are observed, mark Δ. In addition, when more than 25 or a pinhole was observed, it marked with x.

The results are shown in Table 2 below.

As can be seen in Table 2, Examples 1 to 4 according to the present invention can be confirmed to have both excellent aging stability and excellent appearance characteristics.

On the other hand, in Comparative Example 1, in which the coating thickness is thin, the coverage of the silicon release layer is not perfect, and as a result of appearance observation, pinholes are observed and high peel force values are shown. Such a result may cause a problem of tearing of the adhesive layer when separating and laminating the adhesive layer.

In addition, in the case of Comparative Example 2, due to the excessively thick coating thickness, as a result of appearance observation, coating unevenness is generated, and the peeling force is high over time, and after lamination with the adhesive layer, damage to the adhesive layer (such as tearing phenomenon) occurs when separating. Can be.

As described above, the silicone release film made of the silicone release layer formed on the polyester film layer according to the present invention is optimized in the thickness of the silicone release layer formed on the polyester film layer in the in-line manufacturing process, the obtained silicone release The rate of change between the peeling forces is optimized after a certain period of time relative to the initial peeling force of the film, thereby satisfying excellent aging stability and appearance over time.

Therefore, even when the silicone release film of the present invention is stored for a long time due to stocking or transportation due to lamination with a pressure-sensitive adhesive during manufacturing of a polarizing plate, due to its excellent time-release peeling stability, unpeeled phenomenon or adhesive layer tearing phenomenon is reduced, resulting in poor quality. Can be improved.

In addition, due to the excellent appearance characteristics of the silicone release layer, which is a component of the silicone release film, it is possible to minimize confusion such as overdetection and non-detection of defects that may be caused by the release film during the polarizer shipment inspection.

Therefore, the silicon release film of the present invention is any one of the optical display device selected from the group consisting of liquid crystal display, plasma display, personal digital assistant and navigation, organic light emitting diodes (OLED), and polymer light emitting diodes (PLED). It can be usefully applied to the product process. In particular, it can apply to a polarizing plate protective film or a polarizing plate member.

Although the present invention has been described in detail only with respect to the described embodiments, it will be apparent to those skilled in the art that various modifications and variations are possible within the technical scope of the present invention, and such modifications and modifications are within the scope of the appended claims.

1: silicone release film 2: second silicone release film
3: polarizing plate 10: polyester film layer
11: silicone release layer 12, 22: adhesive layer
13: Base material 14: Antistatic layer
20: second polyester film layer 21: second silicon release layer

Claims (9)

1) uniaxially stretching the polyester film,
2) one side or both sides of the stretched polyester film, by applying a silicone component-containing composition to form a silicone release layer in an inline manner,
3) the biaxial stretching by re-stretching the polyester film on which the silicone release layer is formed,
Method for producing a silicone release film with excellent peeling stability over time characterized in that the silicone release layer was formed in step 2) to satisfy the requirements of the following (1) and (2):
(1) 1.1 ≤ X ≤ 2.5
(2) 40nm ≤ Y ≤ 800nm
In the above (1), X is the ratio between the aging peeling power / 1 day aging peeling after at least three months, and in (2) Y is the thickness of the silicon release layer. The method for producing a silicone release film according to claim 1, wherein the silicone release layer is formed of a silicone component-containing composition in which 1.2 to 15.0 wt% of a solid content of the silicone component is contained in a solvent. The method of claim 2, wherein the silicone component-containing composition is based on 100 parts by weight of alkenylpolysiloxane represented by the following formula (1),
3.5 to 7.5 parts by weight of a hydropolypolysiloxane represented by the following formula (2),
0.3 to 2.6 parts by weight of a silane coupling agent,
Method for producing a silicone release film, characterized in that it comprises 0.2 to 1.2 parts by weight of a polysiloxane-based surfactant represented by the formula (3):
Formula 1

In Formula 1, R ₁ , R ₂ and R ₃ is at least two or more selected from -CH = CH ₂ , -CH ₂ -CH ₂ -CH ₂ -CH ₂ -CH = CH ₂ or -CH ₃ molecule At least one alkenyl group is present, m and n are from 50 to 300,
Formula 2

In Formula 2, p is 20 to 300, q is 0 to 300,
Formula 3

In Formula 3, R ₁ is -CH _3, -CH ₂ CH _3, or - (CH ₂₎ a ₉ CH _3, R ₂ is a polyether group, an arylalkyl group, a polyester group, an acrylic group, a carboxyl group or a hydroxyl It is time, x and y are 1-150, and the sum of x and y is 230 or less. delete delete delete The method of claim 3, wherein the silicon component-containing composition further comprises 1,000 to 10,000 ppm of a platinum catalyst. The silicone release film of any one of claims 1, 2, 3 and 7 is used as a liquid crystal display, a plasma display, a personal digital assistant and navigation device, an organic light emitting diode and a polymer light emitting diode (Polymer Light Emitting Diodes). An optical display member applied to any one selected from the group consisting of. The polarizing plate member to which the silicone release film of any one of claims 1, 2, 3 and 7 is applied.

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