KR102423311B1 - Mixed resin film and preparing method thereof - Google Patents

Abstract

The present invention relates to a mixed resin film and a method for manufacturing the same. According to the present invention, a mixed resin of a general-purpose engineering plastic resin and a super engineering plastic resin is used to overcome problems such as different fluidity and melting temperature, and uniform thickness is mixed A resin film can be produced stably, and a mixed resin film with significantly improved mechanical and thermal properties compared to a general-purpose plastic resin film and price competitiveness can be produced.

Description

Mixed resin film and its manufacturing method {Mixed resin film and preparing method thereof}

The present invention relates to a mixed resin film and a method for manufacturing the same.

Plastic materials are divided into mechanical and thermal performance. In general, those used at a low temperature of less than 100 ℃ are called general-purpose plastics, and plastics used above 100 ℃ are called engineering plastics (EP), depending on the temperature that can be used. Furthermore, a thermoplastic resin having heat resistance that can be used for a long time at 150° C. or higher is defined as a super engineering plastic (Super EP).

As described above, the super engineering plastic is a material with very high thermal stability with a continuous service temperature of 150° C. or higher. It is divided into crystalline materials of phthalamide (PPA), polyketone, polyphenylene sulfide (PPS), and amorphous materials of polysulfone and thermoplastic polyimide. .

Among the super engineering plastics, amorphous super engineering plastics are made of sheet materials for exteriors, heat-resistant protective equipment that require self-extinguishing properties, membrane materials, fine chemical materials, and optical materials based on their excellent heat resistance, transparency, and precision injection properties. Although it shows great demand in all industries including, it has a disadvantage that it is very expensive compared to engineering plastics.

On the other hand, polycarbonate is produced by synthesizing bisphenol and hosgene as a kind of representative engineering plastic. Polycarbonate has excellent transparency and impact strength, and excellent dimensional stability and creep resistance, so it is used for various purposes such as food contact containers, medical articles, windows and optics. However, the upper limit of the temperature is lower than that of other engineering plastics, and cracking occurs or the surface is melted when in contact with organic solvents such as halogenated hydrocarbons, aromatic hydrocarbons, esters, ketones, and ethers.

On the other hand, the physical properties between the super engineering plastic resin and the general-purpose engineering plastic resin are markedly different. Therefore, even if the physical properties of super engineering plastics are not required, but the properties of general-purpose engineering plastics do not reach the required performance, there are no alternative materials, so expensive super engineering plastics must be adopted. there is a problem. Therefore, although not up to the level of physical properties of super engineering plastics, it is necessary to develop materials that have improved properties compared to general-purpose engineering plastics and are cheaper than super engineering plastics.

Korean Patent Publication No. 10-1646437

Therefore, the present invention has been devised in view of the above problems, and an object of the present invention is to prepare a mixed resin of general-purpose engineering plastics and super engineering plastics, and by using them, thermal and mechanical properties are remarkably improved, and a mixture having price competitiveness An object of the present invention is to provide a resin film and a method for manufacturing the same.

One aspect of the present invention for achieving the above object is (a) one or more super engineering plastic resin and polycarbonate resin selected from polyetherimide resin and polyethersulfone resin are introduced into a single extruder and mixed molten resin preparing a; and (b) extruding the mixed molten resin and passing it through a plurality of polishing rolls whose temperature is controlled to form a plate shape.

Another aspect of the present invention relates to a mixed resin film prepared according to the manufacturing method.

According to the present invention, a mixed resin film of uniform thickness can be stably manufactured using a mixed resin of a general-purpose engineering plastic resin and a super engineering plastic resin by overcoming problems such as different fluidity and melting temperature, and a general-purpose plastic resin film It is possible to manufacture a mixed resin film having significantly improved mechanical and thermal properties and price competitiveness compared to that of the present invention.

1 is a photograph of a specimen prepared according to an embodiment and a comparative example of the present invention.
Figure 2a Izod impact strength according to the PEI / PC mixing ratio of the injection specimen according to an embodiment and a comparative example of the present invention, Figure 2b is flexural strength, Figure 2c is tensile strength, Figure 2d is Vicat softening temperature measurement results showing It is a graph.
Figure 3a Izod impact strength according to the PES / PC mixing ratio of the injection specimen according to an embodiment and a comparative example of the present invention, Figure 3b is flexural strength, Figure 3c is tensile strength, Figure 3d is Vicat softening temperature measurement results showing It is a graph.
4 is a scanning electron microscope analysis image of the MD direction and the TD direction according to the mixing ratio of the PEI/PC mixed resin film according to an embodiment of the present invention.
5 is a scanning electron microscope analysis image of the MD direction and the TD direction according to the mixing ratio of the PES/PC mixed resin film according to an embodiment of the present invention.
6A is a graph showing the results of measuring the tensile strength in the MD direction of the PEI/PC mixed resin film according to an embodiment of the present invention, and FIG. 6B is the tensile strength in the TD direction.
7A is a graph showing the results of measuring the tensile strength in the MD direction of the PES/PC mixed resin according to an embodiment of the present invention, and FIG. 7B is the tensile strength in the TD direction.

Hereinafter, various aspects and various embodiments of the present invention will be described in more detail.

One aspect of the present invention comprises the steps of (a) adding one or more super engineering plastic resins and polycarbonate resins selected from polyetherimide resins and polyethersulfone resins to a single extruder and preparing a mixed molten resin; and (b) extruding the mixed molten resin and passing it through a plurality of polishing rolls whose temperature is controlled to form a plate shape.

The method for manufacturing a mixed resin film of the present invention relates to a method for manufacturing a mixed resin film of a super engineering plastic resin selected from polyetherimide resin or polyethersulfone resin and a polycarbonate resin, which is one of representative general-purpose engineering plastic resins.

As described above in the background section, super engineering plastics and general-purpose engineering plastics show a significant difference in terms of mechanical and thermal properties and unit cost. The demand for a material that can be used as an alternative has continued to exist if the performance does not reach the required performance.

Efforts have been made to develop a mixed resin of super engineering plastics and general-purpose engineering plastics as a solution to these needs. Since super engineering plastics and general-purpose engineering plastics have very different melting temperatures, there were several problems such as slimming, insufficient adhesion, and difficulty in controlling film thickness, which occurred on the roll surface.

In order to solve these problems, the present inventors consider several aspects such as types of super engineering plastic resins and general-purpose engineering plastic resins, film forming methods, and the like, a method for successfully manufacturing a mixed resin film of super engineering plastic resin and general-purpose engineering plastic resin. completed.

Polyethersulfone (PES) is a type of super engineering plastic and is a thermoplastic, amorphous polymer obtained by polycondensation of dichlorodiphenylsulfone. Polyethersulfone has high heat resistance and strong mechanical properties due to the combination of a benzene ring and a sulfone group, and has excellent flow properties and processability due to ether linkage. Polyethersulfone is an amorphous resin with excellent resistance to hot water and chemicals. In addition, it has self-extinguishing properties, and generates less heat and gas. As the primary processing, injection molding, extrusion molding, solution casting, compression molding, sintering, etc. are all possible, and as the secondary processing, electroplating, vacuum deposition, cutting processing, vacuum molding, ultrasonic bonding, etc. are possible. Polyethersulfone is used for water heater parts, hot water pipes, etc. by using hydrolysis resistance as well as electric, electronic parts, mechanical parts, etc., and can be used as valves, pipes, and medical devices for the food industry.

Polyetherimide (PEI) is also a type of super engineering plastic, and is a polyimide having sufficient ether and other flexible structural units to impart melt processability by conventional techniques such as injection molding and extrusion. Polyetherimide is an amorphous polymer with a glass transition temperature of 215 ° C and a continuous use temperature of 170 - 180 ° C.

The present invention uses a polyetherimide resin or polyethersulfone resin as a super engineering plastic resin, and a polycarbonate resin as a general-purpose engineering plastic, and uses a plurality of temperature-controlled polishing rolls compared to general-purpose engineering plastic resins. It is possible to provide a mixed resin film having price competitiveness while remarkably improving various physical properties including strength.

The super engineering plastic resin and polycarbonate resin of step (a) may be added in a weight ratio of 10:90 to 90:10. As can be seen in Examples to be described later, physical properties such as flexural strength, tensile strength, and heat resistance, excluding impact strength, tend to improve as the content of the super engineering plastic resin increases. Therefore, it can be used by appropriately adjusting the content of the super engineering plastic resin and the polycarbonate resin according to the target performance.

Preferably, the super engineering plastic resin and polycarbonate resin of step (a) may be added in a weight ratio of 70:30 to 90:10. The mixed resin film prepared at the weight ratio in the above range slowed the decrease in heat resistance due to the improvement of the polycarbonate content compared to other ranges, and the heat resistance was maintained at a relatively high level. Therefore, it is preferable in that it is possible to minimize the decrease in heat resistance due to the input of polycarbonate and to have price competitiveness.

More preferably, the super engineering plastic resin is a polyetherimide resin, and the super engineering plastic resin and polycarbonate resin of step (a) may be added in a weight ratio of 70:30 to 90:10, preferably It may be added in a weight ratio of 75:25 to 85:15, more preferably 80:20. As can be seen in Examples to be described later, the mixed resin film prepared under the above conditions not only maintained a relatively high level of heat resistance, but also had higher flexural strength than pure polyether imide.

The super engineering plastic resin may be a polyetherimide resin, the number of the plurality of polishing rolls may be 3 to 5, and the temperature of the plurality of polishing rolls whose temperature is controlled may satisfy Equation 1 below.

[Equation 1]

327 ≤ 215x + 150(1-x) + T ≤ 369

이고, T는 상기 복수의 폴리싱 롤의 온도(℃)이다.In Equation 1, x is in step (a)

and T is the temperature (°C) of the plurality of polishing rolls.

In Equation 1, x is the weight ratio (wt%) of the super engineering plastic resin mixed in step (a), and y is the weight ratio (wt%) of the polycarbonate resin mixed in step (a), T is the temperature (°C) of the plurality of polishing rolls.

In addition, the super engineering plastic resin may be a polyethersulfone resin, the number of the plurality of polishing rolls may be 3 to 5, and the temperature of the plurality of polishing rolls whose temperature is controlled may satisfy Equation 2 below.

[Equation 2]

302 ≤ 215x + 150(1-x) + T ≤ 361

이고, T는 상기 복수의 폴리싱 롤의 온도(℃)이다.In Equation 2, x is in step (a)

and T is the temperature (°C) of the plurality of polishing rolls.

As the content of the super engineering plastic resin decreases, a slip phenomenon occurs in which the film slides from the roll, and the thickness deviation of the produced film is large, and there is a problem in manufacturing a film having a uniform thickness. However, when the conditions of the equations regarding the type of super engineering plastic resin, the number of polishing rolls and the temperature of the polishing roll are satisfied, the slip phenomenon does not affect the film forming thickness, and the film lifting phenomenon that normally occurs in the roll, etc. problem is solved, and stable film production is possible.

According to the most preferred embodiment of the present invention, the super engineering plastic resin is a polyetherimide resin, and the super engineering plastic resin and polycarbonate resin of step (a) are added in a weight ratio of 75:25 to 85:15, The number of the plurality of polishing rolls may be three, and the temperature of the plurality of polishing rolls whose temperature is controlled may satisfy Equation 1-1 below.

[Equation 1-1]

343 ≤ 215x + 150(1-x) + T ≤ 353

이고, T는 상기 복수의 폴리싱 롤의 온도(℃)이다.In Equation 1-1, x is in step (a)

and T is the temperature (°C) of the plurality of polishing rolls.

According to the most preferred embodiment, it was possible to manufacture a film of uniform thickness because problems such as slip phenomenon and film lifting phenomenon that occur during the manufacturing process did not occur, and the thickness was also stable up to a thin film of 100 to 500 μm level. filming was possible. In addition, the Vicat softening temperature of the manufactured mixed resin film was about 195 ° C, showing heat resistance at the level of super engineering plastics, and the flexural strength was rather improved compared to the film prepared using pure polyetherimide resin. As a result of microscopic (SEM) analysis, the dispersed phase boundary between the super engineering plastic resin and the polycarbonate resin was not observed at all, showing excellent compatibility, and thus a film having a transparent and beautiful appearance could be manufactured.

If the above conditions are not satisfied, it was impossible to stably manufacture a film having a uniform thickness such as slip phenomenon or a lifting phenomenon occurred during the manufacturing process, or it was impossible to manufacture a film having a thin thickness at the level of a thin film. In addition, the level of mechanical and thermal properties rapidly decreased according to the content of polycarbonate, and as a result of scanning electron microscopy analysis, the boundary of the dispersed phase was observed, and there may be problems such as poor glossiness of the film.

Another aspect of the present invention provides a mixed resin film prepared according to the manufacturing method.

Hereinafter, preferred examples are presented to help the understanding of the present invention. However, these examples are for explaining the present invention in more detail, the scope of the present invention is not limited thereby, and it is common in the art that various changes and modifications are possible within the scope and spirit of the present invention. It will be self-evident to those with knowledge.

Example 1. Preparation of polyetherimide/polycarbonate (PEI/PC) composite film

Polyetherimide and polycarbonate blending resins were prepared by adjusting the polyetherimide content to 80, 60, 40, and 20 wt%, respectively. In order to prevent film defects, the polyetherimide resin was dried at 150° C. and the polycarbonate resin was dried at 80° C. for 4 hours or more.

The blending resin was melt-extruded into a plate shape through a T-die using a single screw extruder at a temperature of 340 ~ 350 ℃ and a main screw speed of 50 ~ 100 rpm. The temperature of the T-die was adjusted to 350 °C.

The melt-extruded body was prepared in the form of a film by adjusting it to have a thickness of 400 μm through a polishing roll adjusted to the temperature condition according to the content of polyetherimide described below.

In addition, an injection specimen having a thickness of 3.2 mm was prepared to measure impact strength, flexural strength, and thermal deformation temperature. According to the content of polyetherimide, the temperature of the nozzle was adjusted to 340 ~ 370 ℃, and the temperature of the cylinder was adjusted to 310 ~ 360 ℃.

Example 2. Preparation of polyethersulfone/polycarbonate (PES/PC) composite film

Polyethersulfone and polycarbonate blending resin were prepared by adjusting the polyethersulfone content to 80, 60, 40, and 20 wt%, respectively. The resin was used after drying for 4 hours or more at 150 °C and 80 °C, respectively, in order to prevent film defects as in Example 1.

The blending resin was melt-extruded into a plate through a T-die using a single screw extruder at a temperature of 330 to 350 °C and a main screw speed of 50 to 100 rpm. The temperature of the T-die was adjusted to 345 °C.

The melt extruded body was prepared in the form of a film by controlling it to have a thickness of 400 μm through a polishing roll adjusted to the temperature conditions according to the content of polyethersulfone described below.

In addition, an injection specimen having a thickness of 3.2 mm was prepared to measure impact strength, flexural strength, and thermal deformation temperature. According to the content of polyether sulfone, the temperature of the nozzle was adjusted to 325 ~ 345 ℃, and the temperature of the cylinder was controlled to be different from 300 ~ 335 ℃.

The temperature conditions of the polishing roll according to the type and content ratio of the super engineering plastic resin of each Example are described in Table 1 below.

Material Super EP Ratio
(wt%) Polishing roll (temperature controller, temperature, ℃) harol middle roll sang roll PEI/PC 80 185 190 180 60 185 190 180 40 145 150 180 20 125 130 130 PES/PC 80 170 180 185 60 160 170 185 40 120 160 165 20 100 120 145

Table 2 below shows the values calculated by substituting the temperature of the polishing roll of each of the above examples into Equation 1 or Equation 2. The super engineering plastic was substituted in Equation 1 in the case of PEI/PC, which is polyetherimide, and in Equation 2, in the case of PES/PC, which is polyethersulfone.

[Equation 1]

327 ≤ 215x + 150(1-x) + T ≤ 369

이고, T는 상기 복수의 폴리싱 롤의 온도(℃)이다.In Equation 1, x is in step (a)

and T is the temperature (°C) of the plurality of polishing rolls.

[Equation 2]

302 ≤ 215x + 150(1-x) + T ≤ 361

이고, T는 상기 복수의 폴리싱 롤의 온도(℃)이다.In Equation 2, x is in step (a)

and T is the temperature (°C) of the plurality of polishing rolls.

Material Super EP Ratio
(wt%) Equation 1 or 2 harol middle roll sang roll PEI/PC 80 348 353 343 60 361 346 356 40 334 339 369 20 327 332 332 PES/PC 80 333 343 348 60 336 346 361 40 309 349 354 20 302 322 347

As can be seen from Table 2, it was confirmed that the temperature of the polishing roll used in each Example satisfies Equation 1 or Equation 2.

On the other hand, in the case of PEI/PC having a super engineering plastic ratio of 80 wt%, it was confirmed that Equation 1-1 was additionally satisfied.

[Equation 1-1]

343 ≤ 215x + 150(1-x) + T ≤ 353

이고, T는 상기 복수의 폴리싱 롤의 온도(℃)이다.In Equation 1-1, x is in step (a)

and T is the temperature (°C) of the plurality of polishing rolls.

Comparative Example 1. Preparation of pure polyetherimide film

A polyetherimide resin dried at 150° C. for 4 hours or more was prepared in the form of a film having a thickness of 400 μm using the same extruder as in Example 1.

The temperature of the extruder was 335 ~ 345 ℃, the main screw speed was 50 ~ 100 rpm, and the temperature of the polishing roll was adjusted to 190 ℃ / 190 ℃ / 170 ℃ for the upper / middle / lower roll, respectively.

In addition, in order to prepare the injection specimen, the temperature of the nozzle was adjusted to 380 °C, and the temperature of the cylinder was adjusted to 355 to 370 °C.

Comparative Example 2. Preparation of pure polyethersulfone film

A polyethersulfone resin dried at 150° C. for 4 hours or more was prepared in the form of a film having a thickness of 400 μm using the same extruder as in Example 1.

The temperature of the extruder was 330 ~ 340 ℃, the main screw speed was 50 ~ 100 rpm, and the temperature of the polishing roll was adjusted to 190 ℃ / 190 ℃ / 170 ℃ for the upper / middle / lower roll, respectively.

In addition, in order to prepare the injection specimen, the temperature of the nozzle was adjusted to 370 ℃, and the temperature of the cylinder was adjusted to 350 ~ 360 ℃.

Comparative Example 3. Preparation of pure polycarbonate film

A polycarbonate resin dried at 80° C. for 4 hours or more was prepared in the form of a film having a thickness of 400 μm using the same extruder as in Example 1.

The temperature of the extruder was 260 ~ 280 ℃, the main screw speed was 50 ~ 100 rpm, and the temperature of the polishing roll was adjusted to 100 ℃ / 80 ℃ / 60 ℃ for the upper / middle / lower roll, respectively.

In addition, in order to prepare the injection specimen, the temperature of the nozzle was adjusted to 310 °C, and the temperature of the cylinder was adjusted to 290 ~ 300 °C.

1 shows photographs of specimens prepared according to Examples and Comparative Examples.

Experimental Example 1. Measurement of film properties

The physical properties of the films prepared according to the above Examples and Comparative Examples were measured. Izod impact strength was measured by ASTM D256-10e1 (Test Method A) method, flexural strength according to ASTM D790-17 (Procedure A), tensile strength by ASTM D638-14 (Type 1, 50 mm/min), ASTM D1525 The Vicat softening temperature was measured at 17e1 (120 ℃/h) by an authorized agency.

Fig. 2a is a graph showing the Izod impact strength according to the PEI/PC mixing ratio of the injection specimen, Fig. 2b is the flexural strength, Fig. 2c is the tensile strength, and Fig. 2d is the Vicat softening temperature measurement result.

As shown in FIGS. 2a to 2d, it can be seen that the physical properties other than the Izod impact strength are excellent as the PEI mixing ratio, which is a super engineering plastic, increases, and the physical property values decrease linearly as the PEI mixing ratio decreases. could check

In particular, in the case of PEI/PC = 80:20 (weight ratio), the flexural strength had a value of 151.7 MPa, confirming that the flexural strength of pure PEI (147.0 MPa) was improved, and the Vicat softening temperature was relatively low at about 195 °C. It was confirmed that it was maintained at a high level.

It was confirmed that this can be applied as a way to improve overall physical properties such as impact strength while maintaining heat resistance that is higher than that of general-purpose engineering plastics, and to reduce the cost of raw materials by about 20% or more compared to a single super engineering plastic.

3a is a graph showing the Izod impact strength according to the PES/PC mixing ratio of the injection specimen, FIG. 3b is the flexural strength, FIG. 3c is the tensile strength, and FIG. 3d is the Vicat softening temperature measurement result.

As shown in FIGS. 3A to 3D , in the case of PES/PC, overall results similar to those of PEI/PC were confirmed, but the change in impact strength was not significant. In addition, like PEI/PC, PES:PC = 80:20 (weight ratio) maintains relatively high heat resistance, so higher heat resistance is required industrially than conventional general-purpose engineering plastics, but the physical property level of high-cost super engineering plastics is not required. It was confirmed that it can be applied to the industrial group.

Experimental Example 2. Scanning electron microscope observation

The MD direction (length direction of the film) and the TD direction (width direction of the film) of the mixed resin film formed in the above example were confirmed by scanning electron microscope (SEM). 4 is a scanning electron microscope analysis image in the MD direction and TD direction according to the mixing ratio of the PEI/PC mixed resin film, and FIG. 5 is a scanning electron microscope in the MD direction and TD direction according to the mixing ratio of the PES/PC mixed resin film. analysis image.

As shown in FIG. 4, it can be seen that the boundary between the continuous phase and the dispersed phase is not clear, and in particular, in PEI:PC = 80:20 (weight ratio), the boundary cannot be distinguished at all and it is observed as one and the same material. , it was confirmed that the compatibility of the PEI and PC mixed resin film was very good.

On the other hand, in FIG. 5, unlike the PEI/PC mixed resin film of FIG. 4, the overall interface was clearly divided, and it was confirmed that PES lacks compatibility with PC compared to PEI.

More specifically, it can be seen that in the resin containing 20 wt% of PES, PES is generally uniformly dispersed in the PC, which is a continuous phase, in the form of a spherical shape with an average particle size of 2 to 4 μm, and 40 wt% of PES is In this case, it can be seen that the particle size is increased and it is not perfectly spherical as it stretches in the MD direction.

In particular, at 80 wt% of PES, it was confirmed that the continuous phase and the dispersed phase phase transition occurred, and at the same time, long in the MD direction and circular, that is, cylindrical, in the TD direction was observed. This corresponds to one of the typical phenomena that occurs when the extruded resin is elongated in the longitudinal direction by the shear stress applied while flowing through the conduit. In addition, in the form of very densely formed particles having a diameter of 1 μm or less in the MD direction, physical properties such as tensile strength in the TD direction for a film formed with a mixed resin of PES:PC = 60:40 and PES:PC = 80:20 showed the potential for change.

Experimental Example 3. Measurement of Tensile Strength by Film Direction

After forming a film with a thickness of 400 μm using the mixed resin according to the Examples and Comparative Examples, the tensile strength for each film direction in the MD direction and the TD direction was measured by the method described in Example 1 above.

6a is a graph showing the results of measuring the tensile strength in the MD direction of the PEI/PC mixed resin film, FIG. 6b is the tensile strength in the TD direction, FIG. 7a is the MD direction tensile strength of the PES/PC mixed resin, and FIG. 7b is the TD direction It is a graph showing the result of measuring the tensile strength.

As shown in FIGS. 6 and 7, as in Experimental Example 1, it can be seen that the overall tensile strength decreases as the super engineering plastic content decreases, and the tensile strength in the TD direction is inferior to the tensile strength in the MD direction. could check In particular, in the TD direction, both PEI/PC and PES/PC mixed resins exhibited a lower or similar level of tensile strength compared to pure PC when the super engineering plastic content was 40 wt% or less, which was dispersed in a cylindrical shape in the extrusion direction. It is considered that this is due to the distributed form.

Therefore, according to the present invention, it is possible to overcome problems such as different fluidity and melting temperature, and to stably manufacture a mixed resin film of uniform thickness using a mixed resin of a general-purpose engineering plastic resin and a super engineering plastic resin, and a general-purpose plastic resin It is possible to manufacture a mixed resin film having significantly improved mechanical and thermal properties compared to the film and at the same time having price competitiveness.

The above-described Examples and Comparative Examples are examples for explaining the present invention, and the present invention is not limited thereto. Those of ordinary skill in the art to which the present invention pertains will be able to practice the present invention with various modifications therefrom, so the technical protection scope of the present invention should be defined by the appended claims.

Claims (8)

(a) adding a polyethersulfone resin and a polycarbonate resin to a single extruder and preparing a mixed molten resin; and
(b) extruding the mixed molten resin, and passing through a plurality of polishing rolls whose temperature is controlled, and molding the mixed resin film into a plate shape,
The number of the plurality of polishing rolls is 3 to 5,
The temperature of the plurality of polishing rolls whose temperature is controlled is a method for producing a mixed resin film that satisfies the following Equation 2:
[Equation 2]
302 ≤ 215x + 150(1-x) + T ≤ 361
In Equation 2, x is the polyether sulfone resin weight / (polyether sulfone resin weight + polycarbonate resin weight) in step (a),
T is the temperature (°C) of the plurality of polishing rolls.
According to claim 1,
The polyethersulfone resin and the polycarbonate resin of step (a) are 10:90 to 90:10 a method for producing a mixed resin film is added in a weight ratio of 10.
The method of claim 1,
The method for producing a mixed resin film in which the polyethersulfone resin and the polycarbonate resin of step (a) are added in a weight ratio of 70:30 to 90:10.
delete delete delete delete A mixed resin film prepared according to the method of any one of claims 1 to 3.

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