KR102110649B1 - Polyester film - Google Patents

Abstract

The present invention relates to a polyester film which does not damage the adherend and the polyester substrate layer by stably maintaining the peeling properties of the plane surface among the polyester substrate layers.

Description

Polyester film {POLYESTER FILM}

The present invention relates to a polyester film, and more particularly, to a polyester film that does not damage the adherend and the polyester substrate layer by stably maintaining the peel property of the plane surface of the polyester substrate layer.

Currently, polyester films are used in all industries, including decorative materials, carriers, processes, TTRs, polarizations, optics, OCAs, OLEDs, and PAKAGEs.

In particular, in recent years, many companies, such as polarizer companies and polyester film-related companies, are researching and developing to develop and sell products called TACLESS FILM among polarization applications. The objective of this is to develop a polarizing film that satisfies both cost reduction and high durability properties by replacing TAC (Tri Acetyl Cellulose) film with PET (Poly Ethylene Terephthalate) film.

Currently, many tests and developments are underway to make a TACLESS film, and the problem to be solved is to peel the adhesive after coating it on a polyester film to transfer the adhesive, where the adherend (base material) and the adhesive peel off When the peeling force is high, the PET film is damaged, and the adherend is thereby damaged. In addition, in order to prevent damage to the adherend, if the peeling force with the adherend of the pressure-sensitive adhesive is lowered too much, there is a problem in that the wetting property is poor, and thus it is impossible to apply it realistically. This is a problem that occurs because strong adhesive strength is required in the case of the adhesive used for the adhesive of the polarizing plate, as can be seen from that disclosed in Korean Patent Publication No. 10-1748011.

The current problem is that it is impossible to apply the coating layer to reduce the peeling force due to the problem of poor wetting, and when the peeling force is increased, the adhesive force is high and the adhesive force between the adhesive film and the polyester film is damaged, or the polyester is damaged. There is a problem that the film is torn or damaged. In particular, when wetting on a silicone coated surface, wetting is impossible, and due to the property that the peeling force is too high when applying this adhesive film, many problems occur when applying for the TACLESS application to the product currently in use. In addition, this characteristic has a aging characteristic that deteriorates over time, so a basic solution to the existing coating technology is needed to solve the problem.

Thus, the present inventors tried to improve the conventional problems, and by providing a polyester film suitable for TACLESS use, the polyester film and the polyester film having excellent properties that do not damage the polyester film and the adhesive even after lamination and peeling on the polyester film The present invention was completed by confirming having it.

Korean Registered Patent Publication No. 10-1748011

The present invention has been devised to solve the above problems, and an object of the present invention is to provide a polyester film having excellent wettability of the adhesive, and no damage or tearing of the polyester film and the adhesive adhered thereto. will be.

The above and other objects and advantages of the present invention will become more apparent from the following description of the preferred embodiment.

The object includes a polyester base layer and a silicone layer coated with a silicone release agent composition on one side (A side) of the polyester base layer, the other side of which the silicone layer of the polyester base layer is not coated (B side ) Si content is achieved by a polyester film, characterized in that 5 to 25 atomic%.

Here, the Si content of the other side (B side) where the silicon layer is not coated is characterized in that it is 7 to 20 atomic%.

Preferably, the silicone layer comprises 0.1 to 5.5 parts by weight of a hydroelectric polysiloxane, 0.1 to 6.0 parts by weight of a silane coupling agent, and 0.1 to 2.0 parts by weight of a silicone-based or alkoxyalkylate-based surface tension modifier based on 100 parts by weight of an alkenyl polysiloxane. Characterized in that formed by applying a silicone release agent composition.

Preferably, the alkenylpolysiloxane is a compound of Formula 1 or Formula 2 and the hydropolysiloxane is a compound of Formula 3,

(Formula 1)

Here, m and n are natural numbers of 20 to 120,

(Formula 2)

Here, n is a natural number of 10 to 250,

(Formula 3)

Here, n is a natural number of 3 to 60.

Preferably, the silicone release agent composition is characterized in that it further comprises 50 to 1,000 ppm of a catalyst composed of a compound containing platinum or platinum based on the total weight of the composition.

Preferably, the silicone release agent composition is characterized in that the composition diluted in a solvent to 1.0 to 13.0% by weight based on the solid content.

Preferably, the thickness of the polyester base layer is 5㎛ to 300㎛, characterized in that the thickness of the silicon layer is 0.01 to 3㎛ after drying.

Preferably, it is characterized in that the standard peel force of the other side (B side) where the silicon layer is not coated is 100 to 500 gf / in.

Preferably, the silicon layer is characterized in that the peeling force between the other side (B side) is not coated with a strong adhesive containing an acrylic component is 5 ~ 30gf / in.

Preferably, the surface tension of the other surface (B surface) where the silicon layer is not coated is characterized in that 25 to 40 dyne / cm.

In addition, the above-described polyester film may be used in a polarizing plate TACLess film process.

According to the present invention, the wettability of the pressure-sensitive adhesive is excellent, there is no effect such as no damage or tearing of the polyester film and the pressure-sensitive adhesive (adhesive) adhered thereto.

However, the effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the following description.

1 is a conceptual diagram showing a polyester film and an adhesive according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to examples and drawings of the present invention. These examples are only provided by way of example to illustrate the present invention in more detail, it will be apparent to those skilled in the art that the scope of the present invention is not limited by these examples. .

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the present specification, including definitions, will control. Also, although methods and materials similar or equivalent to those described herein can be used in the practice or testing of the present invention, suitable methods and materials are described herein.

As used herein, "comprise", "comprising", "include", "including", "containing", "~ The terms characterized by, "has", "having" or any other variation thereof are intended to cover non-exclusive inclusions. For example, a process, method, article, or apparatus that includes a list of elements is not necessarily limited to only those elements, and may include other elements not explicitly listed or inherent to such a process, method, article, or apparatus. It might be. Also, unless explicitly stated to the contrary, "or" refers to a generic 'or' and not an exclusive 'or'.

First, a polyester film according to an aspect of the present invention will be described in detail with reference to FIG. 1, which is a conceptual diagram showing a polyester film and an adhesive according to an embodiment of the present invention. However, in FIG. 1, reference numeral “20” is expressed as one layer to facilitate classification, but as the surface in contact with the pressure-sensitive adhesive 40, means the other surface (B surface) where the silicone layer is not coated, and this In the specification, "B side" is also referred to as "PLAIN SURFACE".

Referring to FIG. 1, the polyester film according to an embodiment of the present invention includes a polyester base layer 10 and a silicone layer 30 coated with a silicone release agent composition on one side (A side) of the polyester base layer. Includes.

More specifically, it is for forming the pressure-sensitive adhesive layer used in the manufacture of the polarizing plate, wherein the pressure-sensitive adhesive in the polyester substrate layer after coating the pressure-sensitive adhesive for TACLESS on the polyester substrate layer for forming the pressure-sensitive adhesive layer or the adhesive film ( ADHESIVE), when the conventionally produced polyester film is applied to the surface of the substrate, the peeling force is too high and the peeling is not easy, so the adhesive (formed adhesive film) and polyester base when peeling off the polyester substrate and the adhesive The layer has been damaged to solve this problem.

In addition, the same problem occurs due to the high peel strength even when applying the self-adhesive coated film, and when a coating layer with a low surface tension is applied to solve the problem, poor coating due to poor wetting occurs. Bar is to solve this.

In one embodiment, the Si content of the other side (20, B side) of which the silicon layer of the polyester base layer 10 is not coated is 5-25 atomic%. That is, the Si content of elements C, O, and Si when measuring XPS on the plane side (B side) of the polyester base layer is 5 to 25 atomic%, preferably 7 to 20 atomic%, and most preferably 8 to 15 atomic %to be. At this time, if the Si content is less than 5 atomic%, there is a disadvantage that tearing occurs when peeling off the adhesive, and when the Si content exceeds 25 atomic%, pinhole defects occur and there is a disadvantage of poor wetting. It is preferable to make it into a range.

The present invention can achieve the object of the present invention by adjusting the content of alkenyl polysiloxane and hydrogen polysiloxane and the constituent components to form a silicon layer, thereby contributing to the content of the silicon component transferred to the plane (B surface).

Meanwhile, the coating layer 30 formed on the polyester substrate layer 10 may be formed using either an off-line coating technique or an in-line coating technique.

In one embodiment, the silicone layer 30 is 0.1 to 5.5 parts by weight of the hydropolysiloxane with respect to 100 parts by weight of the alkenyl polysiloxane, 0.1 to 6.0 parts by weight of the silane coupling agent, and 0.1 to 2.0 parts by weight of the silicone or alkoxyalkylate surface tension modifier. It may be formed by applying a silicone release agent composition containing a part.

The alkenylpolysiloxane may be a compound of Formula 1 or Formula 2 and the hydropolysiloxane may be a compound of Formula 3.

(Formula 1)

Here, m and n are natural numbers of 20 to 120.

(Formula 2)

Here, n is a natural number of 10 to 250.

(Formula 3)

Here, n is a natural number of 3 to 60.

For convenience of explanation, m and n in Chemical Formula 1 are 25 and 100 in Examples and Comparative Examples below, n in Chemical Formula 2 may be 20, and n in Chemical Formula 3 may be 30, but is not limited thereto.

In the present invention, among the various alkenyl polysiloxanes and hydropolysiloxanes generally used, it is suitable for the purpose of the present invention, that is, the wettability of the adhesive is excellent, and damage or tearing of the polyester film and the adhesive (adhesive) adhered thereto is prevented. It is characterized by limiting the alkenyl polysiloxane and hydropolysiloxane that can provide a missing polyester film. This can be confirmed in a comparative example described later, which will be described later.

In addition, the silicone release agent composition may include 0.1 to 2.0 parts by weight of a silicone-based or alkoxyalkyl-based surface tension regulator, which provides a polyester film having excellent adhesion to a substrate and excellent coating appearance. Examples of the surface tension regulator include the brand name BYK series surface tension regulator, BYK 341, BYK 348, BYK 301, and BYK337.

In addition, the silicone release agent composition is preferably further included in an amount in the range of 50 to 1,000ppm catalyst consisting of platinum or a compound containing platinum based on the total weight of the composition. The catalyst has a curing function, and if the catalyst is less than 50 ppm, there may be a problem of uncuring, and when it exceeds 1,000 ppm, there may be a problem of overcuring.

A method of manufacturing a polyester film according to another aspect of the present invention includes a first step of uniaxially stretching the polyester film, and a second step of forming a silicone layer by applying a silicone release agent composition to one surface of the uniaxially stretched polyester film. A step and a third step of biaxially stretching the polyester film on which the silicon layer is formed may include an inline coating method.

Hereinafter, a method of manufacturing the polyester film according to the present invention will be described step by step.

First, the base film used in the first step is preferably a polyester film excellent in productivity and processability.

Examples of the polyester film include polyester-based resins such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate, but it will be understood that it is not limited thereto.

The polyester film refers to a polyester obtained by polycondensing an aromatic dicarboxylic acid and an aliphatic glycol, and terephthalic acid, 2,6-naphthalenedicarboxylic acid, etc. are used as the aromatic dicarboxylic acid. As the carboxylic acid component, 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, and also aliphatic glycol Examples of the furnace include ethylene glycol, diethylene glycol, 1,4-cyclohexane dimethanol, propylene glycol, butanediol, neopentyl glycol, and the like, and dicarboxylic acid components and glycol components thereof are used in combination of two or more. It is also good.

Representative polyester resins include polyethylene terephthalate (PET), polyethylene-2,6-naphthalenedicarboxylate (PEN), and copolymers containing a third component in these polyesters are also possible.

After the above-mentioned polyester resin is vacuum dried, it is melted with an extruder, extruded onto a sheet through a T-DIE, and tightly cooled by being tightly adhered to a casting drum by an electrostatic application (pinning) to a cooling roll, and unstretched polyester A sheet is obtained, and a uniaxially stretched polyester film is prepared by performing uniaxial stretching of 2.5 to 4.5 times due to a difference in the peripheral speed between the roll and the roll in a roll heated to a glass transition temperature or higher of the polyester resin.

Next, the second step is a step of forming the silicone layer by applying the above-described silicone release agent composition at least once to one surface of the polyester film uniaxially stretched in the first step. As a method of applying the silicone release agent composition, it may be performed by a method such as a meyer bar method, a gravure method, etc., and introduces a polar group on the surface of the base film before application, so that adhesion or application of the silicone layer to the base film is applied. Corona discharge can be used to improve sex. The composition and content of the silicone release agent composition used in the second step are the same as described above.

In addition, the silicone release agent may be applied after dilution in a solvent prior to application on the polyester substrate layer, wherein dilution of the silicone release agent is 1.0 to 13.0% by weight based on the solid content and mixed with the solvent in a residual amount to prepare the silicone release agent composition. It is preferred to manufacture. The solvent is not limited in kind as long as it can be applied to the base film by dispersing the silicone release agent as a solid content, but water is preferably used.

At this time, if the solid content of the silicone release agent composition is less than 1.0% by weight, pinholes may occur, or a uniform silicone coating layer may not be formed, resulting in tearing during peeling after lamination with the adhesive layer. On the other hand, if it exceeds 13.0% by weight, a blocking phenomenon may occur between films, and there may be a problem that a product appearance damage and a change in peeling force with high aging occur.

Next, the third step is a step of producing a biaxially stretched polyester film by re-stretching the polyester film on which the silicon layer prepared in the second step is formed.

At this time, the stretching in the third step is stretched in a direction perpendicular to the uniaxial stretching direction, and the preferred stretching ratio is 3.0 to 7.0 times. After the third step of the stretching process, a polyester release film may be prepared through heat setting, curing, and drying.

In general, in-line coating technology is a technique for simultaneously applying at least one axis of stretching during the film forming process of a polyester film and imparting a new function to the polyester film. It is also possible to coat both sides simultaneously with the development of coating technology. Using this coating technique, the present invention has been achieved.

In this specification, the effect was achieved by implementing the technology with in-line coating, but the researcher who knows that the technology is applied not only to the in-line coating method coated with the polyester film, but also the offline coating method coated after film forming, As it is natural for engineers and engineers, it is not only limited to the in-line coating method, but it is also possible to implement it in the offline coating method.

The thickness of the biaxially stretched polyester base layer according to the present invention is 5 μm to 300 μm, preferably 10 μm to 250 μm.

The thickness of the silicon layer (silicon release layer) according to the present invention is preferably 0.01 to 3 μm after drying. At this time, if the thickness of the silicone release layer after drying is less than 0.01 μm, there is a problem of an increase in peel strength. Conversely, when it exceeds 3 μm, it is most preferable to use the above thickness because uncuring, blocking properties and solvent resistance are weakened.

The above thickness can be measured using any of the coating thicknesses such as ellipsometer, thin film thickness meter, TEM, SEM, etc. The error for the device does not usually exceed 30 nm.

In addition, according to the present invention, it is preferable that the standard peel force of the other surface (B surface) where the silicon layer is not coated is 100 to 500 gf / in. If the standard peeling force of the other side (B side) is less than 100gf / in, it is difficult to wetting when coating the strong adhesive, and if it exceeds 500gf / in, the adhesive or base film (PET FILM) damages when peeling the strong adhesive. It is most preferable to.

In addition, it is preferable that the peeling force between the other side (B side) not coated with a silicone layer and a strong adhesive containing an acrylic component is 5 to 30 gf / in. When the peeling force between the other side (B side) and the strong adhesive containing the acrylic component is less than 5 gf / in, it is difficult to wetting when the strong adhesive is coated, and when it exceeds 30 gf / in, damage to the adhesive or base film occurs when the strong adhesive is peeled off. Therefore, it is most preferable to set the above range.

In addition, it is preferable that the surface tension of the other surface (B surface) where the silicon layer is not coated is 25 to 40 dyne / cm. When the surface tension of the other side (B side) is less than 25 dyne / cm, it is difficult to wetting when the strong adhesive is coated, and if it exceeds 40 dyne / cm, the adhesive or base film is damaged when peeling the strong adhesive. .

In general, the polyester film is wound, and immediately after the winding, transfer of the silicone component by the silicone layer occurs. However, the polyester film according to the present invention can control the composition and content of the release layer during the production of the inline coating method of the polyester film, so that the transfer of the silicone component can be suppressed as much as possible, thereby ensuring excellent wetting properties and aging peeling properties. have.

Therefore, the polyester film according to the present invention is used for liquid crystal displays, plasma displays, personal digital assistants and navigation, organic light emitting diodes, polymer light emitting diodes, polarizing plates, and optical, as well as for double-sided coating or double-sided adhesive use. It can be used for the entire purpose of the peeling substrate to realize the adhesion including the film field and optical use. In particular, the above-described polyester film is useful when used in a polarizing plate TACLess film process.

In addition, although this specification is described based on an example using an adhesive commonly used for TACLESS purposes, anyone in the art knows that it can be applied to any material used for adhesion and adhesion to films, including polyester films. will be.

Hereinafter, the configuration of the present invention and its effects will be described in more detail through examples and comparative examples. However, the present examples are intended to illustrate the present invention in more detail, and the scope of the present invention is not limited to these examples.

<Example 1>

Step 1: Preparation of uniaxially stretched polyester film

Polyethylene terephthalate pellets having an extreme viscosity of 0.625 mm 2 / 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, then melted and extruded. -An amorphous unstretched sheet was produced by adhering the cooling drum to the cooling drum by an electrostatic application method. This was heated again to perform 3.5-fold stretching at 95 ° C. in the film advancing direction to prepare a uniaxially stretched polyester film. After that, 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

On one side of the corona discharge-treated polyester film, 100 parts by weight of alkenyl polysiloxane of Formula 1, 0.5 parts by weight of the hydroelectric polysiloxane of Formula 3, 0.2 parts by weight of silicone surface tension modifier (BYK-341), and 50 ppm of platinum chelate catalyst in water After coating the silicone release agent composition prepared by dilution (8% by weight of the solid content of the composition), the silicone release agent composition applied in a tenter section at 105 to 140 ° C was dried, and stretched 3.5 times in the vertical direction with the film moving direction. Heat treatment at 250 ° C. for 4 seconds produced a 25 μm thick polyester film.

<Example 2>

A polyester film was prepared in the same manner as in Example 1, except that 1.0 part by weight of the hydropolysiloxane of Formula 3 was used.

<Example 3>

A polyester film was prepared in the same manner as in Example 1, except that 1.5 parts by weight of the hydropolysiloxane of Formula 3 was used.

<Example 4>

A polyester film was prepared in the same manner as in Example 1, except that 2.5 parts by weight of the hydropolysiloxane of Formula 3 was used.

<Example 5>

A polyester film was prepared in the same manner as in Example 1, except that 3.5 parts by weight of the hydropolysiloxane of Formula 3 was used.

<Example 6>

A polyester film was prepared in the same manner as in Example 1, except that 5.5 parts by weight of the hydropolysiloxane of Formula 3 was used.

<Example 7>

A polyester film was prepared in the same manner as in Example 1, except that the alkenyl polysiloxane of Formula 2 was used.

<Example 8>

A polyester film was prepared in the same manner as in Example 3, except that the alkenyl polysiloxane of Formula 2 was used.

<Example 9>

A polyester film was prepared in the same manner as in Example 5, except that the alkenyl polysiloxane of Formula 2 was used.

<Comparative Example 1>

With respect to 100 parts by weight of the alkenyl polysiloxane of Formula 4, a polyester film was prepared in the same manner as in Example 1, except that 1.0 part by weight of the hydropolysiloxane of Formula 5 was used.

(Formula 4)

Where R ₁ and R ₂ are -CH ₃ , R ₃ is CH = CH ₂ , m and n are each 60,

(Formula 5)

Here, p is 30 and q is 60.

<Comparative Example 2>

A polyester film was prepared in the same manner as in Comparative Example 1, except that 4.0 parts by weight of the hydropolysiloxane of Formula 5 was used.

<Comparative Example 3>

A polyester film was prepared in the same manner as in Example 1, except that 6.0 parts by weight of the hydropolysiloxane of Formula 3 was used.

<Comparative Example 4>

A polyester film was prepared in the same manner as in Example 1, except that 0.01 parts by weight of the hydroelectric polysiloxane of Formula 3 was used.

<Comparative Example 5>

A polyester film was prepared in the same manner as in Comparative Example 3, except that the alkenyl polysiloxane of Formula 2 was used.

<Comparative Example 6>

A polyester film was prepared in the same manner as in Comparative Example 4, except that the alkenyl polysiloxane of Formula 2 was used.

<Comparative Example 7>

A polyester film was prepared in the same manner as in Example 1, except that the silicone release agent composition was not coated.

Using the polyester films according to Examples 1 to 9 and Comparative Examples 1 to 7, the physical properties were measured through the following experimental examples and the results are shown in Table 2 below.

[Experimental Example]

<Experimental Example 1: XPS measurement>

In order to measure the amount of silicon transfer of the polyester film prepared in Examples and Comparative Examples, the side (B side) transferred from the obtained polyester sample was subjected to an X-ray photoelectron spectroscope (model name: K-Alpha, Using the manufacturer ThermoFisher), C1s, O1s, and Si2P were measured 5 times (Atomic%) to obtain an average.

<Experimental Example 2: Standard peel force>

Measuring device after leaving for 1 day at 25 ℃, 55% RH condition after reciprocating pressing standard adhesive tape (TESA7475) with 2Kg load on the plain surface (B side) where silicone layer is not coated at 25 ℃, 55% RH ( chem.Instrument, trade name AR-1000).

For the sample size of 50 X 1,500 mm and the peel force measurement size of 250 X 1,500 mm, the peeling force (g / in) was obtained by obtaining the average value of five repeated measurements at 180 ㅀ peeling angle and peeling rate of 0.3 m / min. I got it.

<Experimental Example 3: Evaluation of peel strength with acrylic adhesive>

(1) Preparation of acrylic adhesive

Based on solid content in 18 g of methyl ethyl ketone, 100 g of acrylic copolymer, modified polyisocyanate crosslinking agent (BXX-6460, manufactured by Toyo Ink, molecular weight: 356 g / mol, number of isocyanate groups per molecule of modified polyisocyanate crosslinking agent: 0.65 g), Mix silane coupling agent KBM-803 (3-mercaptopropyl trimethoxysilane, manufactured by Shinyetsu, molecular weight: 196 g / mol, number of alkoxy groups per molecule of silane coupling agent: 3) 0.84 g and mix at 25 ° C for 30 minutes The adhesive composition for polarizing plates was prepared by stirring.

(2) Coating and peeling force measurement

After coating the pressure-sensitive adhesive composition prepared in (1) on the plain side (B side) of which the silicone layer is not coated among the polyester films according to Examples and Comparative Examples, it is left for 1 week at 35 degrees, and then measured after 1 hour. Peeling force was measured using a device (chem. Instrument, trade name AR-1000).

For the sample size of 50 ㅧ 1,500㎜ and the peeling force measurement size of 250 ㅧ 1,500㎜, it was performed under 180 ㅀ peeling angle and peeling rate of 0.3m / min, and the average value of the 5 repeated measurements was obtained to determine the peeling force (g / in). I got it.

<Experimental Example 4: Wetting property (pinhole property defect)>

5 cm x 5 cm samples were prepared from the polyester films prepared in Examples and Comparative Examples, and the area of pinhole defects in 5 cm x 5 cm of the samples was measured. After measuring the longest length of the bubble defect for each sample within 5 cm x 5 cm, calculate the area in a circle, calculate the total area (A), and calculate the bubble defect area ratio according to Equation 1 below. It evaluated as Table 1.

(Equation 1)

Bubble defect area ratio (%) = A / 25cm ² * 100

Bubble defect level Bubble defect area ratio (x,%) ◎ 0 <= x <1 ○ 1 <= x <2 △ 2 <= x <5 X 5 <= x <100

<Experimental Example 5: tearing phenomenon>

In the above Experimental Example 3, the adhesive was peeled off, and the adhesive film and the polyester base layer were observed with the naked eye to check whether they were uniformly peeled and evaluated according to the following evaluation criteria .

◎: Peeled without damage to the base layer and the adhesive film to form an adhesive layer uniformly

X: Damage occurs in the base layer and the adhesive film to form a non-uniform adhesive layer

division Silicone Physical properties (B side) vinyl
Siloxane Hydroelectric
Siloxane Hydroelectric
Siloxane content (%) Si content
(XPS, Si at%) Standard
Peeling force
(g / in) Wetting Castle
(Pinhole Castle
fault) With acrylic adhesive
Peeling force
(g / in) Tearing phenomenon
(Adhesive and polyester
Base layer) Example 1 Formula 1 Formula 3 0.5 19.0 300 ◎ 5 ◎ Example 2 Formula 1 Formula 3 1.0 14.3 350 ◎ 12 ◎ Example 3 Formula 1 Formula 3 1.5 8.9 400 ◎ 14 ◎ Example 4 Formula 1 Formula 3 2.5 7.8 480 ◎ 20 ◎ Example 5 Formula 1 Formula 3 3.5 8.5 440 ◎ 18 ◎ Example 6 Formula 1 Formula 3 5.5 9.4 430 ◎ 16 ◎ Example 7 Formula 2 Formula 3 0.5 17.3 310 ◎ 7 ◎ Example 8 Formula 2 Formula 3 1.5 9.9 390 ◎ 14 ◎ Example 9 Formula 2 Formula 3 3.5 8.3 439 ◎ 18 ◎ Comparative Example 1 Formula 4 Formula 5 1.0 4.6 550 ◎ 75 X Comparative Example 2 Formula 4 Formula 5 4.0 4.9 580 ◎ 85 X Comparative Example 3 Formula 1 Formula 3 6.0 4.3 650 ◎ 35 X Comparative Example 4 Formula 1 Formula 3 0.01 26.2 650 X 4 ◎ Comparative Example 5 Formula 2 Formula 3 6.0 4.2 640 ◎ 36 X Comparative Example 6 Formula 2 Formula 3 0.01 27.0 660 X 3 ◎ Comparative Example 7 Uncoated products 0 2200 ◎ 90 X

As can be seen from Table 2, the polyester films according to Examples 1 to 9 of the present invention optimize the content and structure of the silicon layer to control the transferred Si content, thereby achieving excellent peelability with wettability and acrylic adhesive It is possible to form an excellent adhesive layer and a film because there are no tear marks in the acrylic adhesive and the polyester film.

On the other hand, the polyester films according to Comparative Examples 1 and 2 using the alkenyl polysiloxane of Formula 4 and the hydropolysiloxane of Formula 5 have poor appearance or damage due to tearing off the adhesive and the polyester film when peeling. In addition, in the case of Comparative Examples 3 and 4 and Comparative Examples 5 and 6 using the alkenyl polysiloxane and hydropolysiloxane having the same chemical formula as in the Examples, the other side of the silicone layer of the polyester base layer was not coated (B Comparative Example 3 and Comparative Example 5 in which the Si content of the cotton) is less than 5 atomic% occurs when peeling off the adhesive, and the Si content of the other surface (B side) where the silicone layer of the polyester base layer is not coated is 25 atomic In Comparative Examples 4 and 6, which exceeded%, pinhole defects occurred, and thus it was confirmed that coating was impossible due to poor wetting properties.

In this specification, only a few examples of the various embodiments performed by the present inventors are described, but the technical spirit of the present invention is not limited to or limited thereto, and can be variously implemented by a person skilled in the art.

10: polyester base layer
20: the other side of the silicon layer is not coated (B side)
30: silicon layer
40: adhesive

Claims (11)

Polyester base layer,
The one side of the polyester substrate layer (A side) comprises a silicone layer coated with a silicone release agent composition,
The Si content of the other side (B side) where the silicon layer of the polyester base layer is not coated is 5-25 atomic%,
The silicone layer is formed by applying a silicone release agent composition comprising an alkenylpolysiloxane that is a compound of Formula 1 or Formula 2 and a hydropolysiloxane that is a compound of Formula 3,
(Formula 1)

Here, m and n are natural numbers of 20 to 120,
(Formula 2)

Here, n is a natural number of 10 to 250,
(Formula 3)

Here, n is a natural number of 3 to 60, characterized in that the polyester film. According to claim 1,
The Si content of the other side (B side) where the silicon layer is not coated is 7-20 atomic%, polyester film. According to claim 1,
The silicone release agent composition comprises 0.1 to 5.5 parts by weight of the hydropolysiloxane, 0.1 to 6.0 parts by weight of a silane coupling agent, and 0.1 to 2.0 parts by weight of a silicone-based or alkoxyalkylate-based surface tension modifier based on 100 parts by weight of the alkenyl polysiloxane. Characterized by a polyester film. delete According to claim 3,
The silicone release agent composition is characterized in that it further comprises 50 to 1,000 ppm of a catalyst composed of a compound containing platinum or platinum based on the total weight of the composition, a polyester film. According to claim 3,
The silicone release agent composition is characterized in that the composition diluted in a solvent to 1.0 to 13.0% by weight based on the solid content, polyester film. According to claim 1,
The thickness of the polyester substrate layer is 5㎛ to 300㎛,
The thickness of the silicon layer is characterized in that 0.01 to 3㎛ after drying, polyester film. According to claim 1,
The polyester layer is characterized in that the standard peel force of the other side (B side) is not coated with the silicone layer is 100 to 500gf / in. According to claim 1,
The silicone layer is characterized in that the peeling force between the other side of the non-coated (B side) and a strong adhesive containing an acrylic component is 5 ~ 30gf / in, polyester film. According to claim 1,
The surface tension of the other side (B side) where the silicon layer is not coated is 25 to 40 dyne / cm, a polyester film. The polyester film according to any one of claims 1 to 3 and 5 to 10, characterized in that it is used in the polarizing plate TACLess film process, polyester film.

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