KR102418356B1 - Resin composition for release film and release film comprising the same - Google Patents

Abstract

The present invention provides a resin composition for a release film that can prevent transfer of the release layer component and has excellent coatability when processing an adhesive or green sheet by securing processing suitability, and has excellent adhesion and peelability, and a release film comprising the same As to the present invention, it is possible to provide a resin composition for a release film comprising at least one polymer resin selected from among polyacrylates, polyurethanes and polyesters, a curing agent, and a long-chain alkyl compound.

Description

A resin composition for a release film and a release film comprising the same

The present invention relates to a resin composition for a release film and a release film containing the same, and more particularly, to a release layer having excellent coating properties when processing a pressure-sensitive adhesive or green sheet because processing suitability is secured, and excellent adhesion and peelability, and a release layer It relates to a resin composition for a release film capable of preventing the transfer of components, and a release film comprising the same.

In general, a release film means a film having a release property that does not adhere well to an adhesive component, and is attached with a protective film such as an adhesive film or tape. These release films are mainly used to prevent adhesives from being deposited on unintentional adherends before use or to prevent contamination by foreign substances, etc. It is also used as a carrier film for molding a green sheet or the like.

For this purpose, a polyester film having excellent mechanical strength, dimensional stability and price competitiveness is used as a base film. For example, as disclosed in Korean Patent Publication No. 10-2011-0029721, a silicone release composition is applied to one side A silicone release film with a release layer is widely used.

As the thickness of the adhesive and the green sheet continues to thin according to the trend of light, thin and small products due to the recent technological development, wettability is improved in the case of processing the adhesive or green sheet on the release layer of the silicone release film. There is a problem that uniform coatability cannot be ensured due to insufficient reasons.

In addition, the transfer of the silicone component constituting the release layer of the silicone release film causes contamination of the processing equipment, or the mixing of the silicone component into the adhesive or green sheet, resulting in deterioration of the physical properties of the processed product. This is being requested.

Accordingly, the present inventors devise a release composition containing a long-chain alkyl compound, while forming a release layer through a cross-linking reaction between a polymer resin, a curing agent, and a long-chain alkyl compound, processing suitability during adhesive or green sheet processing is secured. , the present invention was completed after confirming that it was possible to manufacture a release film that has excellent coatability of the adhesive or green sheet, has excellent adhesion and peelability, and can suppress the transfer problem of the release layer component.

Korean Patent Publication No. 10-2011-0029721

The present invention has been devised to solve the above problems and meet the requirements of the prior art, and an object of the present invention is to have excellent coatability of a pressure-sensitive adhesive or green sheet, and excellent adhesion and peelability, and a release layer component An object of the present invention is to provide a resin composition for a release film capable of suppressing the transfer problem and a release film comprising the same.

These and other objects and advantages of the present invention will become more apparent from the following description of preferred embodiments.

The above object is, based on 100 parts by weight of at least one polymer resin selected from polyacrylate, polyurethane and polyester, a resin composition for a release film comprising 10 to 40 parts by weight of a curing agent and 10 to 40 parts by weight of a long-chain alkyl compound is achieved by

Here, the long-chain alkyl compound has a functional group selected from hydroxy, amino, amide, epoxy, aldehyde, carboxylic acid, isocyanate, isocyanurate, carbodiimide, and carbamate, and has at least one alkyl group having 4 to 20 carbon atoms. characterized by including.

Preferably, the long-chain alkyl compound comprises at least one of an isocyanurate functional group and a carbamate functional group.

Preferably, the long-chain alkyl compound has a weight average molecular weight of 250 to 1,200.

Preferably, the curing agent is at least one selected from a polyfunctional epoxy compound, a polyfunctional melamine compound, a polyfunctional carbodiimide compound, a polyfunctional oxazoline compound, a polyfunctional isocyanate compound, and a polyfunctional carboxylic acid compound.

Preferably, the resin composition for a release film further comprises an aromatic sulfonic acid as a curing reaction accelerator.

Preferably, the curing reaction accelerator is characterized in that it contains 1 to 20 parts by weight based on 100 parts by weight of the polymer resin.

Preferably, the aromatic sulfonic acid is characterized in that it is para-toluenesulfonic acid.

In addition, the above object is achieved by a release film comprising a base film and a release layer coated with the resin composition for a release film on at least one surface of the base film.

Here, the surface of the release layer is characterized in that the water contact angle is 90 degrees to 105 degrees.

Preferably, the surface of the release layer is characterized in that the contact angle with respect to methylene iodide is 50 degrees to 70 degrees.

Preferably, the release film has a peeling force of 100 to 250 g/inch.

Preferably, the residual adhesion of the release film is characterized in that 95 to 100%.

Preferably, the thickness of the release layer is characterized in that 50 to 200 nm.

Preferably, the release layer is characterized in that the peel force increase rate after the friction resistance evaluation is less than 20%.

According to the present invention, through the curing reaction with the long-chain alkyl compound, there are effects such as excellent coatability of the pressure-sensitive adhesive or green sheet, and excellent adhesion and peelability.

Furthermore, the present invention has effects such as being able to prevent transfer of the release layer component.

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 schematic cross-sectional view of a release film according to an embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to embodiments and drawings of the present invention. It will be apparent to those of ordinary skill in the art that these examples are merely presented by way of example to explain the present invention in more detail, and 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 variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, article, or apparatus comprising a list of elements is not necessarily limited to only those elements, but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. may be Also, unless expressly stated to the contrary, "or" refers to an inclusive 'or' and not an exclusive 'or'.

As used herein, the term “on (or on)” includes not only a case in which another part is located “directly on (or directly on)” but also a case in which another part is interposed therebetween. Conversely, the term “directly on (or directly on)” means without intervening other portions.

First, the release film according to an aspect of the present invention will be described in detail with reference to FIG. 1 , which is a schematic cross-sectional diagram of the release film according to an embodiment of the present invention.

Referring to FIG. 1 , the release film 100 according to an embodiment of the present invention includes a base film 110 and a release layer 120 coated with a resin composition for a release film on at least one surface of the base film. The release layer 120 may be disposed only on one side of the base film 110 , or may be disposed on both sides of the base film 110 .

The resin composition for a release film forming the release layer 120 according to an embodiment contains 10 to 40 parts by weight of a curing agent and 10 to 40 parts by weight of a curing agent based on 100 parts by weight of a polymer resin that is one selected from polyacrylate, polyurethane, and polyester. 10 to 40 parts by weight of the compound may be included.

Since the conventional silicone release film has a low surface energy of the silicone release layer, there is a case where the wettability is insufficient when applying a solution for processing an adhesive or a green sheet, and thus there is a problem that uniform coatability cannot be secured. In addition, there is a risk of transferring the unreacted silicone component remaining in the silicone release layer, which causes contamination of the equipment in the processing process, or the silicone component is mixed into the pressure-sensitive adhesive or green sheet, thereby reducing the physical properties of the processed product.

In order to solve the above conventional problems, in the present invention, a silicone component is excluded and a long-chain alkyl compound is introduced, while a release layer is formed through a curing reaction between the long-chain alkyl compound, a polymer resin, and a curing agent.

To this end, based on 100 parts by weight of the polymer resin, the curing agent and the long-chain alkyl compound are included in the same amount, and may each include 10 to 40 parts by weight. When the content of the curing agent and the long-chain alkyl compound is less than 10 parts by weight relative to 100 parts by weight of the polymer resin, sufficient peelability cannot be ensured, and there may be a problem that the adhesive or green sheet does not peel off, and if it exceeds 40 parts by weight, This is because, since the content of the long-chain alkyl compound is excessive compared to the content of the polymer resin, the curing reaction with the polymer resin does not proceed sufficiently, so that unreacted substances may remain in the release layer.

As described above, the release layer according to an embodiment of the present invention formed after the curing reaction has high surface energy due to the polymer resin component, so it is possible to secure wettability in the processing process, and the content of the curing agent and the long-chain alkyl compound compared to the polymer resin By adjusting the peelability can be adjusted. In addition, it does not contain a silicone component, and by minimizing the amount of unreacted material remaining in the release layer, it is possible to prevent the problems of contamination of equipment in the processing process or deterioration of the physical properties of the pressure-sensitive adhesive or green sheet.

The long-chain alkyl compound of the resin composition for a release film forming the release layer 120 according to an embodiment is hydroxy, amino, amide, epoxy, aldehyde, carboxylic acid, isocyanate, isocyanurate, carbodiimide, and carbamate. It has a selected functional group and may include at least one alkyl group having 4 to 20 carbon atoms.

Since the long-chain alkyl compound undergoes a curing reaction with the functional group of the polymer resin or the functional group of the curing agent by heat to form a release layer, it is preferable to include a functional group capable of curing reaction by heat. In addition, the long-chain alkyl compound preferably has an alkyl group having 4 to 20 carbon atoms, so that the peelability of the release layer is secured, and more preferably, it may have an alkyl group having 8 to 20 carbon atoms. When the number of carbon atoms is less than 4, it does not have sufficient release property, so there is a problem in that the peelability is lowered. In addition, as the curing reaction rate is slowed, a problem in which unreacted materials remain in the release layer may occur.

In addition, the long-chain alkyl compound preferably has an isocyanurate functional group and includes at least one alkyl group having 4 to 20 carbon atoms. The long-chain alkyl compound has an isocyanurate functional group, more specifically, an isocyanurate functional group in the form of a cyclic terpolymer, and when it has a long-chain alkyl group as a side branch, an optimal release layer can be formed through a thermal curing reaction. And it is possible to prevent problems due to lack of solubility.

In addition, the long-chain alkyl compound preferably has a carbamate functional group and includes at least one alkyl group having 4 to 20 carbon atoms. In the case of having a carbamate functional group and a long-chain alkyl group, an optimal release layer may be formed through a thermal curing reaction, and a problem due to insufficient solubility may be prevented.

The long-chain alkyl compound is a long-chain alkyl compound having an isocyanurate functional group and a long-chain alkyl compound having a carbamate functional group, and may be used alone or in combination.

In addition, the long-chain alkyl compound may have a weight average molecular weight of 250 to 1,200. When the weight average molecular weight of the long-chain alkyl compound is less than 250, the long-chain alkyl group does not have sufficient releasability due to insufficient length of the long-chain alkyl group or the number of long-chain alkyl groups present in the molecule, so there is a problem in that peelability is reduced, and the weight average molecular weight of the long-chain alkyl compound In the case of more than 1,200, the solubility is insufficient, and in the application process including the release layer, an appearance deterioration problem may occur due to insoluble substances, and as the curing reaction rate is slowed, a problem that unreacted substances remain in the release layer may occur. because there is

The curing agent of the resin composition for a release film forming the release layer 120 according to an embodiment is a polyfunctional epoxy compound, a polyfunctional melamine compound, a polyfunctional carbodiimide compound, a polyfunctional oxazoline compound, a polyfunctional isocyanate compound, and a polyfunctional It may be composed of at least one selected from functional carboxylic acid compounds.

The curing agent undergoes a curing reaction with the functional group of the polymer resin or the functional group of the long-chain alkyl compound by heat to form a release layer, so it is preferable that a functional group capable of curing reaction by heat is included in the release layer In order to prevent unreacted substances from remaining, it is preferably a polyfunctional compound having two or more functional groups in one molecule. In addition, the curing agent may be appropriately selected in consideration of the type of functional group possessed by the polymer resin and the long-chain alkyl compound, and the temperature and amount of heat at which the thermal curing reaction proceeds.

The resin composition for a release film forming the release layer 120 according to an embodiment may further include a curing reaction accelerator.

In the case of a polymer resin, the curing reaction proceeds with the curing agent and the long-chain alkyl compound by heat. In a situation where sufficient heat is not given after the resin composition is applied to the base film, the curing agent or long-chain alkyl compound that has not participated in the reaction may occur. If the curing agent or long-chain alkyl compound that did not participate in the reaction remains, there is a risk of contamination of the processing equipment or the deterioration of the physical properties of the adhesive or green sheet. By increasing the rate, unreacted substances can be minimized. The content of the curing reaction accelerator may be appropriately selected depending on the amount of heat given to the curing reaction, but the content of the curing reaction accelerator is preferably 1 to 20 parts by weight based on 100 parts by weight of the polymer resin. Based on 100 parts by weight of the polymer resin, when the content of the curing reaction accelerator is less than 1 part by weight, it is difficult to expect the curing reaction accelerating performance, and when the content of the curing reaction accelerator is more than 20 parts by weight, the curing reaction in the release layer As the accelerator remains, there may be problems in that the equipment in the processing process is contaminated or the physical properties of the adhesive or the green sheet are deteriorated.

This curing reaction accelerator may be an aromatic sulfonic acid. As long as it is a material that can act as a catalyst to prevent unreacted substances from remaining in the release layer by speeding up the curing reaction rate with the polymer resin and the curing agent or long-chain alkyl compound, it can be used regardless of the type as needed, but in the present invention The resin composition for a release film according to , is the aromatic sulfonic acid, and it is most preferable to include para-toluenesulfonic acid as a curing reaction accelerator.

The release film 100 according to an embodiment of the present invention may include a base film 110 and a release layer 120 composed of the above-described resin composition for a release film applied to at least one surface of the base film 110 . have.

The surface of the release layer 120 according to an embodiment may have a water contact angle of 90 degrees to 105 degrees. In addition, the surface of the release layer may have a contact angle of 50 to 70 degrees with respect to methylene iodide.

The contact angle is the angle formed by the interface when the three states of the gaseous, liquid and solid state meet when a liquid is thermodynamically balanced on the surface of the solid, and is used as a measure of the wettability of the solid surface, and the chemical properties of the liquid and The contact angle depends on the chemical properties of the solid. A high contact angle indicates that the chemical properties of the liquid and the solid are different from each other and shows low wettability, whereas a low contact angle indicates that the chemical properties of the liquid and the solid are similar to each other and high wettability.

When the contact angle of water or the contact angle of methylene iodide has the above values, wettability when the coating solution is applied in the process of processing the adhesive or green sheet can be secured, and an adhesive or green sheet with uniform coating properties can be obtained. . In this case, the contact angle of water is preferably 90 degrees to 105 degrees, more preferably 95 degrees to 100 degrees. At the same time, the contact angle of methylene iodide is preferably 50 to 70 degrees, more preferably 50 to 60 degrees. When the contact angle of water is less than 90 degrees or the contact angle of methylene iodide is less than 50 degrees, wettability in the processing process can be ensured, but there is a problem in that the surface energy of the release layer is too high to lower the peeling force, and the contact angle of water is 105 When the degree of contact or the contact angle of methylene iodide exceeds 70 degrees, the surface energy of the release layer is too low, and there is a problem in that the wettability in the processing step is lowered.

Therefore, in the release film according to the present invention, the composition of the resin composition for the release film is adjusted so that the contact angle of water and the contact angle of methylene iodide can satisfy the above-mentioned values, so that wettability in the processing process and peelability can be secured at the same time. will become At this time, the derived surface energy value of the release layer may be 25 dyne/cm to 35 dyne/cm, and more preferably 28 dyne/cm to 32 dyne/cm according to the result calculated according to the Owens-Wendt model. .

In addition, the peeling force of the release film 100 according to an embodiment may be 100 to 250 g/inch. The release layer of the release film has a contact angle adjusted as a long-chain alkyl group is exposed on the surface, thereby exhibiting releasability, and thus the peeling force may be 100 to 250 g/inch, and 100 to 200 g/inch. more preferably. If the peeling force is less than 100 g/inch, the adhesive or green sheet applied on the release layer has insufficient adhesiveness, so the adhesive or green sheet may float from the release layer or peel off at an unwanted point in time. This is because, when the force is greater than 250 g/inch, the peelability of the release layer is lowered, making it difficult to peel the pressure-sensitive adhesive or green sheet from the release layer, which may cause process problems.

In addition, the residual adhesion rate of the release film 100 according to the embodiment may be 95 to 100%. The release layer of the release film does not contain a silicone component, and the amount of unreacted material remaining through reaction with a polymer resin and a curing agent or a long-chain alkyl compound is minimized. There is little risk of this being lowered. Accordingly, since the performance of the pressure-sensitive adhesive laminated with the release layer is not deteriorated, the residual adhesive rate may be 95 to 100%, more preferably 98 to 100%.

The thickness of the release layer 120 according to an embodiment may be 50 to 200 nm. Since the release layer of the release film is formed through a curing reaction of a polymer resin and a curing agent or a long-chain alkyl compound in the drying process, it is necessary to have a thickness within a certain range so that the long-chain alkyl group can be exposed on the surface of the release layer after the curing reaction. The thickness of the release layer formed after drying and curing may be 50 to 200 nm, more preferably 50 to 100 nm. When the thickness of the release layer is less than 50 nm, as a sufficient amount of long-chain alkyl groups becomes difficult to be exposed on the surface of the release layer, the release property deteriorates and the peel force may increase. In the process, a lot of heat is consumed and the amount of unreacted substances increases due to insufficient heat supply for the curing reaction, which may cause contamination of process equipment or adhesives and green sheets. This is because the appearance of the release layer may deteriorate.

The release layer 120 according to an embodiment may have a peel force increase rate of less than 20% after the friction resistance evaluation. The release layer of the release film is formed through a curing reaction of a polymer resin and a curing agent or a long-chain alkyl compound, and a curing reaction accelerator is applied as necessary. It has little change characteristics. As such, the release layer may have a peeling force increase rate of less than 20% after evaluation of friction resistance, and it is advantageous to apply it to a processing process because there is little change in peeling force due to friction.

Hereinafter, the configuration of the present invention and its effects will be described in more detail through Examples and Comparative Examples. However, these examples are for explaining the present invention in more detail, and the scope of the present invention is not limited to these examples.

[Example]

[Example 1]

25 parts by weight of a polyfunctional melamine compound (Nippon Carbide) as a curing agent, 25 parts by weight of a polyfunctional melamine compound as a curing agent, and dodecylisocyanurate (weight average molecular weight 634) as a long-chain alkyl compound based on 100 parts by weight of a polyacrylate resin (Nippon Carbide) as a polymer resin parts, and 4 parts by weight of para-toluenesulfonic acid as a curing reaction accelerator was added to prepare a resin composition for a release film.

Next, the prepared resin composition for the release film was diluted with the remaining amount of water so that the solid content was 5%, and it was applied on one side of a corona-treated biaxially oriented polyester base film (Toray Advanced Materials, Excell-50㎛). Thereafter, the film was dried at 180° C. for 50 seconds to prepare a release film having a release layer thickness of 70 nm.

[Example 2]

A resin composition for a release film was prepared and coated in the same manner as in Example 1, except that 25 parts by weight of octadecyl isocyanurate (weight average molecular weight 886) was blended as a long-chain alkyl compound to prepare a release film.

[Example 3]

A resin composition for a release film was prepared in the same manner as in Example 1, except that 10 parts by weight of a polyfunctional melamine compound as a curing agent and 10 parts by weight of dodecyl isocyanurate as a long-chain alkyl compound were mixed and applied to prepare a release film did

[Example 4]

A resin composition for a release film was prepared in the same manner as in Example 1, except that 40 parts by weight of a polyfunctional melamine compound as a curing agent and 40 parts by weight of dodecyl isocyanurate as a long-chain alkyl compound were mixed and applied to prepare a release film did

[Example 5]

A resin composition for a release film was prepared and applied in the same manner as in Example 1, except that 100 parts by weight of a polyurethane resin (Cheil Industrial Pharmaceutical Co., Ltd.) was blended as a polymer resin to prepare a release film.

[Example 6]

A resin composition for a release film was prepared and applied in the same manner as in Example 1, except that 25 parts by weight of ethynyldodecylcarbamate (weight average molecular weight 253) was blended as a long-chain alkyl compound to prepare a release film.

[Example 7]

A resin composition for a release film was prepared and applied in the same manner as in Example 1, except for the curing reaction accelerator, except for mixing, to prepare a release film.

[Comparative Example 1]

A resin composition for a release film was prepared in the same manner as in Example 1, except that 5 parts by weight of a polyfunctional melamine compound as a curing agent and 5 parts by weight of dodecyl isocyanurate as a long-chain alkyl compound were mixed and applied to prepare a release film did

[Comparative Example 2]

A resin composition for a release film was prepared in the same manner as in Example 1, except that 60 parts by weight of a polyfunctional melamine compound as a curing agent and 60 parts by weight of dodecyl isocyanurate as a long-chain alkyl compound were mixed and applied to prepare a release film did

[Comparative Example 3]

A resin composition for a release film was prepared and coated in the same manner as in Example 1, except that 25 parts by weight of octacoic acid isocyanurate (weight average molecular weight 1,306) was blended as a long-chain alkyl compound to prepare a release film.

[Comparative Example 4]

A resin composition for a release film was prepared and applied in the same manner as in Example 1, except that 25 parts by weight of ethyl isocyanurate (weight average molecular weight 214) was blended as a long-chain alkyl compound, thereby preparing a release film.

[Comparative Example 5]

A resin composition for a release film was prepared in the same manner as in Example 1, except that 5 parts by weight of a polyfunctional melamine compound as a curing agent and 25 parts by weight of dodecyl isocyanurate as a long-chain alkyl compound were mixed and applied to prepare a release film did

[Comparative Example 6]

A resin composition for a release film was prepared and applied in the same manner as in Example 1, except that 25 parts by weight of an epoxy compound having only one functional group as a curing agent was blended to prepare a release film.

[Comparative Example 7]

Without blending a polymer resin, 100 parts by weight of dodecyl isocyanurate (weight average molecular weight 634) as a long-chain alkyl compound relative to 100 parts by weight of a polyfunctional melamine compound (Japan Carbide) was blended, and paratoluenesulfonic acid 4 as a curing reaction accelerator A resin composition for a release film was prepared and applied in the same manner as in Example 1 by adding parts by weight to prepare a release film.

Physical properties were measured through the following experimental examples using the release films according to Examples 1 to 7 and Comparative Examples 1 to 7, and the results are shown in Tables 1 and 2 below.

[Experimental example]

1. Peel force measurement

(1-1) Sample preparation for peel force measurement

The release film was attached to the cold-rolled stainless steel plate with double-sided adhesive tape so that the release layer of the release film was on top. On the release layer, an adhesive tape (Nitto's 31B model) having a width of 1 inch and a length of 30 cm was placed and laminated by applying a load of 2 kg to prepare a sample for measuring peel force.

(1-2) Preparation of samples for measuring friction resistance and peeling force

The release film was attached to the cold-rolled stainless steel plate with double-sided adhesive tape so that the release layer of the release film was on top. An industrial nonwoven fabric (Ventus Co., heavy-duty model) was placed on the release layer, and a load of 1 kg was applied and rubbed back and forth 10 times. Next, an adhesive tape (Nitto's 31B) having a width of 1 inch and a length of 30 cm was placed and laminated by applying a load of 2 kg to prepare a sample for measuring the friction-resistance peel force.

(1-3) Peel force measurement

After storing the prepared sample for measuring peel force at room temperature for 1 day, set the peeling angle of 180° using AR-1000 (Chem-Instrument) equipment and peel the tape under the condition of a peeling rate of 0.3 m per minute. The force required for this was measured, and the average value was calculated by measuring three times.

2. Measurement of Residual Adhesion

On the release layer of the release film, an adhesive tape (Nitto's 31B model) having a width of 1 inch and a length of 30 cm was placed, compressed with a pressure roller of 2 kg, left at room temperature for 30 minutes, and then the adhesive tape was peeled from the release layer. The peeled adhesive tape was attached to a cleanly cleaned cold-rolled stainless steel plate again and compressed with a pressure roller of 2 kg, and then the peel force required to peel the tape was measured.

In addition, for comparison, an adhesive tape (Nitto's 31B model), which has never been used, is cut into 1 inch wide and 30 cm long, attached to a cleanly washed cold-rolled stainless steel plate, compressed with a 2 kg pressure roller, and then the tape is peeled off. The required peel force was measured.

The measurement was performed using AR-1000 (Chem-Instrument) equipment, set to a peel angle of 180 °, measured under conditions of a peel rate of 0.3 m per minute, measured 5 times for each to calculate an average value, and the following formula According to 1, the residual adhesion rate was calculated.

(Equation 1)

Residual adhesion rate = (Peel force of adhesive tape peeled from the release layer) / (Peel force of adhesive tape that has not been used) X 100 (%)

3. Contact angle measurement

The release layer of the release film was placed on top, and 2.4 μl of water was dripped on the release layer under an atmosphere of 22 ± 2 °C and 50 ± 5 %RH, respectively. After 1 second, the contact angle was measured using DROPMATER 300 (KYOWA Interface Science, Inc.). At this time, the measured value was measured 10 times to obtain an average value.

In the same manner, the contact angle when 2.4 μl of methylene iodide was dripped onto the release layer was measured 10 times to obtain an average value.

4. Green sheet coatability

With respect to 100 parts by weight of barium titanate powder, 30 parts by weight of polyvinyl butyral resin and 3 parts by weight of dioctyl phthalate as a plasticizer were mixed and diluted with 200 parts by weight of a solvent to prepare a ceramic slurry. The ceramic slurry was applied on the release layer and dried to form a green sheet of 5 μm. By observing the appearance of the green sheet, the level of coatability of the green sheet was evaluated as follows.

○: When no defects are observed on the green sheet due to excellent coatability

X: When defects are observed due to poor coatability

5. Green sheet peelability

In the case of peeling off the green sheet formed in Experimental Example 4, the level of peelability was evaluated as follows based on the degree to which the ceramic sheet was peeled and the residual ceramic sheet remaining in the release film.

○: When the release film is peeled cleanly without any residue due to good releasability

X: When remnants remain due to poor peelability

division Example
One Example
2 Example
3 Example
4 Example
5 Example
6 Example
7 peel force
(g/inch) 140 130 190 105 175 140 140 Friction Resistance Peeling Force
(g/inch) 155 150 220 110 205 150 160 Residual adhesion rate (%) 99 99 100 98 98 100 97 water/methylene iodide
Contact angle (Deg.) 99/
57 100/
54 95/
52 100/
59 99/
51 99/
55 99/
57 Green Sheet Coatability ○ ○ ○ ○ ○ ○ ○ Green sheet peelability ○ ○ ○ ○ ○ ○ ○

division comparative example
One comparative example
2 comparative example
3 comparative example
4 comparative example
5 comparative example
6 comparative example
7 peel force
(g/inch) 230 90 120 350 140 110 70 Friction Resistance Peeling Force
(g/inch) 265 120 155 350 195 275 380 Residual adhesion rate (%) 100 97 90 100 89 77 73 water/methylene iodide
Contact angle (Deg.) 92/
47 106/
60 98/
60 86/
33 99/
57 97/
55 99/
52 Green Sheet Coatability ○ X X ○ ○ X X Green sheet peelability X ○ ○ X ○ ○ ○

As can be seen from Table 1, the release film according to Examples 1 to 7 of the present invention has a peel force that satisfies the range of 100 to 250 g/inch, and the peel force increase rate after friction resistance evaluation is suppressed to less than 20%, In addition, since the surface of the release layer has a water contact angle of 90 to 105 degrees and a contact angle of methylene iodide in the range of 50 to 70 degrees, it can be confirmed that the green sheet coatability and peelability are simultaneously satisfied.

In contrast, in the release film according to Comparative Example 1, the content of the curing agent and the long-chain alkyl compound is insufficient compared to the polymer resin, and thus the peeling force is increased, and thus the peelability is not secured. In addition, in the release film according to Comparative Example 2, the content of the curing agent and the long-chain alkyl compound was excessive compared to the polymer resin, so that the peeling force was lowered, the contact angle of water was high, and thus, it was confirmed that the coatability was poor.

In addition, in the release film according to Comparative Example 3, as the alkyl group of the long-chain alkyl compound becomes longer, the curing reaction rate of the long-chain alkyl compound is slowed, and the unreacted long-chain alkyl compound remains in the release layer, so the residual adhesion rate is lowered and the coatability is reduced. not secured On the other hand, in the release film according to Comparative Example 4, the reactivity is improved as the alkyl group of the long-chain alkyl compound is shortened, but it can be confirmed that the release property is deteriorated, such as the peeling force is increased, so that the peelability is not secured.

In addition, in the release film according to Comparative Example 5, there is a risk of contamination because the unreacted material of the long-chain alkyl compound remains as the amount of the curing agent is not sufficient. In the case of the release film according to Comparative Example 6, it can be seen that there is a risk of contamination because unreacted materials remain in the release layer due to insufficient functional groups of the curing agent, and coatability is not secured. In addition, since the release film according to Comparative Example 7 does not contain a polymer resin, adhesion of the release layer to the base film is not secured, so that friction resistance is deteriorated, while coatability is also deteriorated, so it can be confirmed that it is difficult to utilize as a release film.

As described above, according to the release film according to an embodiment of the present invention, processing suitability is secured, and it can be confirmed that coatability, adhesion, and peelability are excellent.

In this specification, only a few examples among the various embodiments performed by the present inventors are described, but the technical spirit of the present invention is not limited or limited thereto, and it is of course that it may be modified and variously implemented by those skilled in the art.

100: release film
110: base film
120: release layer

Claims (15)

With respect to 100 parts by weight of at least one polymer resin selected from polyacrylate, polyurethane and polyester,
10 to 40 parts by weight of a curing agent and 10 to 40 parts by weight of a long-chain alkyl compound,
The long-chain alkyl compound comprises at least one of an isocyanurate functional group and a carbamate functional group, the resin composition for a release film. delete delete According to claim 1,
The long-chain alkyl compound has a weight average molecular weight of 250 to 1,200, a resin composition for a release film. The method of claim 1,
The curing agent is at least one selected from a polyfunctional epoxy compound, a polyfunctional melamine compound, a polyfunctional carbodiimide compound, a polyfunctional oxazoline compound, a polyfunctional isocyanate compound, and a polyfunctional carboxylic acid compound, a resin composition for a release film. According to claim 1,
The resin composition for the release film further comprises an aromatic sulfonic acid as a curing reaction accelerator. 7. The method of claim 6,
The curing reaction accelerator comprises 1 to 20 parts by weight based on 100 parts by weight of the polymer resin, a resin composition for a release film. 7. The method of claim 6,
The aromatic sulfonic acid is para-toluenesulfonic acid, a resin composition for a release film. base film and
A release film comprising a release layer coated with the resin composition for a release film according to any one of claims 1 and 4 to 8 on at least one surface of the base film. 10. The method of claim 9,
The release layer surface has a water contact angle of 90 degrees to 105 degrees, the release film. 10. The method of claim 9,
The surface of the release layer has a contact angle with respect to methylene iodide of 50 degrees to 70 degrees, the release film. 10. The method of claim 9,
The peeling force of the release film is 100 to 250 g / inch, the release film. 10. The method of claim 9,
The residual adhesive rate of the release film is 95 to 100%, the release film. 10. The method of claim 9,
The release layer has a thickness of 50 to 200 nm, a release film. 10. The method of claim 9,
The release layer has a peel strength increase rate of less than 20% after evaluation of friction resistance, a release film.

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