KR101938234B1 - Polyester silicone release liner for high clear - Google Patents

Abstract

The present invention relates to a high transparency silicone release polyester film which is a release liner for pressure sensitive adhesive carriers during the laminating process of an industrial film adhesive and a method for producing the same. The high transparency silicone release polyester film according to the present invention can be produced by a sequential biaxial stretching method In the three-layer laminated polyester film thus produced, an upper layer and a lower layer of a polyester resin layer (C) not containing fine particles were formed of a polyester resin containing an amorphous silicon compound having an average particle diameter of 0.04 to 3.2 탆 A silicon release coating layer (A) in which a thickness ratio of the C layer to the B or D layer is laminated to from 4 to 40 with the particle layers (B and D), and at least one surface of the B or D layer contains an epoxy compound and a silane compound, Wherein the two-dimensional center line maximum roughness (SRz) of the layer (B) and the layer (D) is 0.08 to 0.3 mu m, and the three-layer laminated polyester It characterized in that the haze of the film is less than 1% LE.
The highly transparent silicone releasable polyester film according to the present invention having the above-described structure exhibits excellent releasability and dimensional stability through an in-line coating process to provide a sufficient function as a release film of a thermal short film for solar cells, , It is possible to provide a large quantity of products having uniform physical properties due to the inline coating method and the simultaneous axial stretching manufacturing method as well as the implementation of the high transparency film.

Description

[0001] Description [0002] Polyester silicone release liner for high clear < RTI ID = 0.0 >

More particularly, the present invention relates to a high transparency silicone release polyester film which is a release liner for a pressure-sensitive adhesive carrier during a laminating process of an industrial film pressure-sensitive adhesive, and more particularly, The acrylic adhesive resin is applied in a uniform thickness in the step of applying a liquid acrylic pressure-sensitive adhesive resin to be used as a cover, followed by a drying process and a cover film for solar, and after passing through the high- Transparency silicone release polyester film which is laminated with a film to constitute a pressure-sensitive adhesive set.

High transparency with low haze in the industrial market The rise in demand for silicone release polyester film is related to the demand for automotive window film. Until recently, the window film market has been using imported B-grade products in Korea for domestic and commercial use by sellers who can not accurately recognize small-sized interior companies or films. However, with the increase in sales in the automotive market, the distinction between automotive and architectural films has become clearer and more and more efforts are being made among distributors to produce better window films. Examples are high-transparency thermal barrier films that transmit visible light and effectively block hot infrared radiation and harmful ultraviolet rays. Conventional window film has a low visible light transmittance due to low reflectance of visible light, but its internal heat radiation is weak. However, by using high transparency window film, harmful ultraviolet rays are effectively blocked, and the visible light transmittance is increased, the greenhouse effect and cooling load are blocked, There is a trend.

Accordingly, when the market for release films for protective films for high-transparency heat-shielding films is increasing, there is a demand for high-transparency silicone release films having excellent loft-off properties and easily falling off and excellent residual adhesive strength. The development of high performance and high transparency polyester release liner is urgently required, but there is no remarkable suggestion.

SUMMARY OF THE INVENTION The present invention has been accomplished in order to solve the above-mentioned problems and to solve the problems of the prior art. It is an object of the present invention to provide a method for forming a stable release coating layer, To provide a silicone release polyester film used as a release liner.

Another object of the present invention is to provide a manufacturing method which can more easily manufacture a silicone release polyester film used as a silicone release liner having the above-mentioned excellent properties.

The present invention may also be directed to accomplish these and other objects, which can be easily derived by those skilled in the art from the overall description of the present specification, in addition to the above-mentioned and obvious objects.

The high transparency silicone release polyester film of the present invention is obtained by coating a silicone release coating layer including a silicon main chain, a silicon catalyst, an anchoring agent, a defoaming agent, a surfactant, and the like on one surface of a film by an inline method, The silicone-modified polyester film obtained by the above process is applied on a releasable coated surface of the above highly transparent silicone release polyester film by gravure coating, offset coating, slot die coating or the like in a liquid acrylic adhesive resin used as an industrial pressure- The acrylic adhesive resin is applied in a uniform thickness and the liquid acrylic adhesive resin is applied to the surface of the cover film at a high temperature After passing through the drying process, the cover film and the laminate Byte is is is achieved by a polyester film for in-line silicone release film constituting the pressure-sensitive adhesive sets.

Therefore, in order to accomplish the above object, the present invention provides a highly transparent silicone releasable polyester film comprising:

In the three-layer laminated polyester film produced by the sequential biaxial stretching method,

(B, D) composed of a polyester resin containing an amorphous silicon compound having an average particle diameter of 0.04 to 3.2 mu m was formed on the upper and lower layers of the polyester resin layer (C) The thickness ratio of the C layer to the C layer is 4 to 40,

And a silicone release coating layer (A) comprising an epoxy compound and a silane compound on at least one surface of the B or D layer, wherein the two-dimensional center line maximum roughness (SRz) of the layer (B) um,

And the haze of the three-layer laminated polyester film of the B, C and D layers is less than 1%.

According to another aspect of the present invention, the silicone release coating layer of the silicone release polyester film is coated by a coating solution containing at least an epoxy compound and a silane compound on at least one side of the film by an in-line coating method.

According to another embodiment of the present invention, the silicone release coating layer of the film maintains a thickness of not more than 1.5 占 퐉, and there is no transfer of material to the contact surface or the opposite surface.

According to still another embodiment of the present invention, the thickness of the film is 19 to 75 占 퐉, the thermal shrinkage in the MD direction is controlled to 5.0% or less among numerical values of the heat shrinkage measured by being left in a thermostatic chamber at 150 占 폚 for 30 minutes, And the heat shrinkage rate in the TD direction is controlled to a value of 2.5% or less.

The highly transparent silicone releasable polyester film according to the present invention having the above-described structure exhibits excellent releasing force and dimensional stability through an in-line coating process and provides sufficient function as a releasing film for a solar short film (for building and automobile) In addition, it is possible to provide a large number of products having uniform physical properties due to the in-line coating method and the simultaneous axial stretching manufacturing method as well as the implementation of the high transparency film by using the lamination method, and also the production method of the polyethylene film Can easily be adjusted by controlling the manufacturing process, and thus can be applied to the above applications very appropriately in terms of processability and use in various use conditions.

1 is a cross-sectional view of a highly transparent silicone-modified polyester film according to a preferred embodiment of the present invention.

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

Fig. 1 is a cross-sectional view of a highly transparent silicone-modified polyester film according to a preferred embodiment of the present invention. The film according to the present invention has an average particle diameter of 0.04 to 0.04 mm in an upper layer and a lower layer of a polyester resin layer (C) (B, D) composed of a polyester resin containing an amorphous silicon compound having a thickness of 3.2 mu m and a thickness ratio of the C layer to the B or D layer is 4 to 40, and at least one surface Wherein the two-dimensional center line maximum roughness (SRz) of the layer (B) and the layer (D) is 0.08 to 0.3 mu m, and the thicknesses of B, C and The haze of the three-layer laminated polyester film of the D layer becomes less than 1%.

The type of the polyethylene film used in the present invention is not limited, and conventionally known ones can be used. In the present invention, a polyethylene resin such as polyethylene, polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate is mainly described.

The polyethylene terephthalate film constituting the film refers to polyethylene obtained by polycondensing an aromatic dicarboxylic acid and an aliphatic glycol. Examples of the aromatic dicarboxylic acid include terephthalic acid and 2,6-naphthalenedicarboxylic acid. Examples of the aliphatic glycol include ethylene glycol, diethylene glycol, 1,4-cyclohexanedimethanol and the like.

For the silicone release coating layer of the present invention, any type of organopolysiloxane can be used, such as addition type, condensation type, and ultraviolet ray curing type, but the representative molecular structure of the present invention is represented by the following chemical formula 1.

[Chemical Formula 1]

Here, m and n are integers of 0 or more.

The organopolysiloxane contains an alkenyl group in the molecule, and an alkenyl group may be present in any part of the molecule, preferably at least two. The molecular structure may be linear or branched, or may have a structure in which a straight chain and a branch are present together.

As the curing agent in the composition of the coating composition according to the present invention, any type such as addition type, condensation type and ultraviolet ray curable type may be used. Typical molecular structure of organohydrogen polysiloxane, which is a typical curing agent of the present invention, 2 < / RTI >

(2)

Here, p and q are integers of 0 or more.

The organohydrogenpolysiloxane may be either linear, branched or cyclic, or a mixture thereof. The viscosity and the molecular weight are not limited, but the compatibility with the organopolysiloxane should be good, and the amount of hydrogen atoms bonded to the silicon atom in the alkenyl group of the organopolysiloxane is in the range of 0.5 to 1.2 desirable. If the number of hydrogen atoms bonded to silicon atoms is less than 0.5 per one alkenyl group of the organopolysiloxane, there may be a problem that good curability may not be obtained. If the number of hydrogen atoms exceeds 1.2, elasticity and physical properties after curing may deteriorate . On the other hand, in the silicone mold release composition according to the present invention, when the amount of the organohydrogenpolysiloxane is larger than that of the organopolysiloxane, cross-linking is much promoted and flexibility is reduced, resulting in cracking of the film and reduction in smoothness.

The film of the present invention uses a biaxially stretched polyethylene film having excellent releasability and excellent productivity and processability.

The thickness of the polyethylene film in the present invention is not limited, but is preferably from 19 to 50 microns (mu m), and more preferably from 23 to 25 microns (mu m).

As described above, according to the present invention, a film having a three-layer structure of a specific structure and having a silicone release coating layer formed on one side thereof is excellent in stability over time, and the stability of the polyester film layer due to the effect of oligo- And silicon layer, it is possible to develop a stable releasing performance with a pressure-sensitive adhesive having adhesive property after coating a silicone release coating layer having excellent property of loft-off after thermally aging, and to exhibit excellent dimensional stability in a high-temperature drying process And provides an excellent wettability in coating the acrylic adhesive resin as a carrier by a gravure coating method.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to examples of the present invention. However, these examples are merely illustrative examples for the purpose of more specifically describing the present invention and the scope of the present invention is not limited to these examples. Will be apparent to those skilled in the art.

Example

In the three-layer laminated polyester film produced by the sequential biaxial stretching method, a polyester containing an amorphous silicon compound having an average particle diameter of 2.0 탆 in an upper layer and a lower layer of a polyester resin layer (C) A resin layer (B, D) containing an epoxy compound and a silane compound having a thickness ratio of the C layer to the B or D layer of 18, a releasing force of 18 g / in on one surface and a residual adhesive ratio of 90% A polyester film containing a silicone release coating layer was prepared.

Comparative Example 1

In a three-layer laminated polyester film produced by a sequential biaxial stretching method, a polyester containing an amorphous silicon compound having an average particle diameter of 4.0 탆 (hereinafter, referred to as " polyester resin " The resin layer (B, D) contains an epoxy compound and a silane compound having a thickness ratio of the C layer to the B or D layer of 3, a releasing force of 18 g / in on one side and a residual adhesive ratio of 90% And a silicone release coating layer having a thickness of 19 [mu] m.

Comparative Example 2

Layer laminated polyester film produced by a sequential biaxial stretching method, a polyester resin layer (C) in which a small amount of an amorphous silicon compound having an average particle diameter of 3.5 占 퐉 is added is provided with an upper layer and a lower layer having an average particle diameter of 0.04 to 3.2 (B, D) composed of a polyester resin containing an amorphous silicon compound having an amorphous silicon compound with a thickness ratio of the C layer to the B or D layer of 18, a release mold releasing force of 18 g / in on one surface, And a silicon release coating layer containing a silane compound and having a thickness of 23 [mu] m.

Comparative Example 3

In the three-layer laminated polyester film produced by the sequential biaxial stretching method, a polyester containing an amorphous silicon compound having an average particle size of 3.7 mu m was formed on the upper and lower layers of a polyester resin layer (C) A resin layer (B, D) containing an epoxy compound and a silane compound having a thickness ratio of the C layer to the B or D layer of 18, a releasing force of 18 g / in on one surface and a residual adhesive ratio of 90% To prepare a polyester film containing a silicone release coating layer having a thickness of 38 mu m.

Comparative Example 4

In a three-layer laminated polyester film produced by a sequential biaxial stretching method, a polyester containing an amorphous silicon compound having an average particle diameter of 4.5 mu m is formed on an upper layer and a lower layer of a polyester resin layer (C) A resin layer (B, D) containing an epoxy compound and a silane compound having a thickness ratio of the C layer to the B or D layer of 18, a releasing force of 18 g / in on one surface and a residual adhesive ratio of 90% And a thickness of 75 mu m was prepared.

Experimental Example:

According to FINAT Test Method No. 1 for the films prepared in the above Examples and Comparative Examples 1 to 4, TESA7475 was laminated with a load of 2 kgf on the surface or untreated surface of a silicone release film with a standard adhesive tape and left for 24 hours Followed by measurement at a peel angle of 180 degrees and a peel rate of 0.3 m / min. The size of the measurement sample was 100 mm in length and 25.4 mm in width, and the unit of peeling force was gram / inch, and the average value was calculated by measuring three times.

Further, the films prepared in the above Examples and Comparative Examples 1 to 4 were evaluated for physical properties, and the results are shown in Table 1 below.

Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Example 1 Thickness of release substrate 19 탆 23 탆 38 탆 75 m 23 탆 Thickness ratio (B: C: D) 1: 3: 1 1: 18: 1 1: 18: 1 1: 18: 1 1: 18: 1 C layer silicon compound input X O X X X Hayes 2.1 1.1 1.2 2.5 0.85 Substrate property
[Haze]
[Release force]
180 ° Peel @ 300 mm / min
TESA 7475 tape
[Residual adhesion rate]
Nitto31B tape
[Lateral heat shrinkage]
150 [deg.] C./30 min.
[Surface roughness, SRz]
[Longitudinal tensile strength]
[Transverse tensile strength]
2.1%
15 g / in.


89%

2.3%

0.25
32kgf / mm2
13kgf / ㎟
1.1%
18 g / in.


94%

2.5%

0.312
42kgf / mm2
34kgf / ㎟
1.2%
34 g / in.


97%

1.2%

0.05
25kgf / mm2
13kgf / ㎟
2.5%
60 g / in.


99%

-0.6%

0.02
15kgf / ㎟
14kgf / mm2
0.85%
18 g / in.


94%

0.35%

0.035
28kgf / ㎟
26kgf / ㎟ Release force 15 g / in. 18 g / in. 34 g / in. 60 g / in. 18 g / in.

As can be seen from the above Table 1, it can be confirmed that the film of the example according to the present invention possesses high transparency function, excellent releasability, processability and dimensional stability.

It is to be understood that the present invention is not limited to the above embodiments and various changes and modifications may be made by those skilled in the art without departing from the scope of the present invention.

Claims (4)

In the three-layer laminated polyester film produced by the sequential biaxial stretching method,
In the intermediate polyester resin layer (hereinafter referred to as C layer), those having no fine particles at all were used, and in the polyester resin layers (hereinafter referred to as B and D layers) 0.04 to 3.2 占 퐉, the ratio of the thickness of the C layer to the B or D layer should be 4 to 40,
And a silicone release coating layer (A) comprising an epoxy compound and a silane compound on at least one side of the B or D layer, wherein the two-dimensional center line roughness (SRz) of the layer (B) um, and the haze of the three-layer laminated polyester film of the B, C and D layers should be less than 1%
The film has a thickness of 19 to 75 占 퐉 and has a heat shrinkage in the MD direction of 5.0% or less and a heat shrinkage in the TD direction of 2.5% or less among numerical values of the heat shrinkage measured by being left in a thermostatic chamber at 150 占 폚 for 30 minutes Value,
Wherein the silicone release coating layer of the film has a thickness not exceeding 1.5 占 퐉 and no transfer of material to the contact surface or the opposite surface is required and the release peeling strength is from 15 g / in to 60 g / in. Ester film
The high-transparency silicone release type polyester film according to claim 1, wherein the silicone release coating layer of the silicone release polyester film is coated by a coating liquid containing at least an epoxy compound and a silane compound on one side of the film by an in- .
delete delete

Images