JP4017028B2 - Method for producing synthetic resin film - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for producing a synthetic resin film, and more particularly to a method for producing a synthetic resin film which is stable and economical when a non-fluidized thin film-like resin is peeled on a support such as an endless belt or a drum. .
[0002]
[Prior art]
A synthetic resin film is formed by continuously extruding or coating a fluid resin composition as a raw material on a support such as an endless belt or a drum in a smooth thin film with a slit die or an applicator, followed by drying, heating or The thin film-like product which has been made non-fluidized by cooling is peeled off from the support by applying tension to the thin film-like product, and subsequently subjected to treatments such as heating and stretching as necessary.
[0003]
In the production method described above, when the non-fluidized thin film-like formed product is peeled off from the support, it is necessary to apply an appropriate magnitude of tension according to the peel strength between the two to the thin film-like formed product. That is, it is necessary to apply tension to the thin film-like product that is larger than the peel strength and small enough not to crack the thin film-like product. By applying an appropriate tension, the thin film-like formed product can be continuously peeled from the support, and a continuous production of a synthetic resin film becomes possible.
[0004]
However, if the mechanical properties such as the tear strength of the thin film-shaped product do not have sufficient strength to withstand the tension necessary for peeling, the edge of the thin film-shaped product starts from a minute defect. A crack is generated more, and the crack grows to break the thin film-like product, resulting in a situation where continuous production cannot be performed. As used herein, “fine defects” include, for example, dust defects located at the end of the thin film-like product, generation of bubbles, uneven thickness, and end surfaces that are not straight (notched end surfaces).
[0005]
Therefore, several means are conceivable as means for avoiding the above-described situation in which breakage occurs due to a crack from the end portion and continuous production cannot be performed. For example, there is means for subjecting the entire surface of the support such as an endless belt or a drum to a treatment for reducing the peel strength from the non-fluidized thin film-like formed product on the support. Moreover, the method of using the additive which reduces peeling strength in the fluid resin composition used as a raw material is also disclosed. Further, a method that does not cause a fine defect generated at the end of the thin film-like product is also conceivable. Furthermore, it is conceivable to increase the tear strength of the thin film-like product so that cracks do not occur even if fine defects occur.
[0006]
However, for example, in a means for performing a treatment for reducing the peel strength of a non-fluidized thin film-like formed product on the entire support surface such as an endless belt or a drum, a synthetic resin film obtained as a product is used. There was a problem that it could not be used depending on the application.
[0007]
This is because it is necessary to maintain a high level of smoothness on the surface of a synthetic resin film produced using a support such as an endless belt or a drum. Mirror finish processing is applied to give a high level of smoothness. Therefore, when the treatment for reducing the peel strength with the non-fluidized thin film resin is performed on the mirror surface, the smoothness of the mirror surface is reduced as compared with the case where the treatment is not performed, and the film as a product. This is because the smoothness of the surface is lost.
[0008]
In addition, the method of using an additive that lowers the peel strength in the flowable resin composition as a raw material greatly affects the properties of the synthetic resin film obtained as a product even if the peel strength is reduced and continuous production is possible. In some cases, however, necessary characteristics cannot be obtained.
[0009]
In addition, in the method that does not generate the fine defects generated at the end of the thin film-like product, the fine defects are generated at a certain frequency in the continuously operating apparatus, and the fine defects are not generated. It was difficult to realize.
[0010]
Furthermore, in a method in which cracks do not occur even if a fine defect occurs by increasing the tear strength of the thin film-like product, a support such as an endless belt or a drum is used as a means for increasing the tear strength of the thin film-like product. However, in this case, the characteristics of the synthetic resin film obtained as a product may be greatly affected, which is inconvenient as a means.
[0011]
As mentioned above, some examples have been given as a means to avoid the situation where breakage occurs due to cracks from the edge and continuous production is not possible. When it was difficult, it was inappropriate as a means of avoidance.
[0012]
[Problems to be solved by the invention]
Therefore, the present inventors have solved the above-mentioned conventional problems, can stably produce a synthetic resin film without causing breakage of the thin film-like formed product, and the surface smoothness and various properties of the obtained synthetic resin film. As a result of extensive research on methods that do not affect the characteristics, the present invention has been achieved.
[0013]
[Means for Solving the Problems]
The gist of the method for producing a synthetic resin film according to the present invention is that a fluid resin composition is continuously formed into a thin film having a certain width on a support, and then a non-fluidized thin film formed product is formed. In the manufacturing process of the synthetic resin film peeled off from the support, a treatment for reducing the peel strength between the non-fluidized thin-film formed product and the support is applied to the part on the support where the end of the film-formed product is located. There is to do.
[0014]
In addition, the treatment for reducing the peel strength between the non-fluidized thin film-like product and the support is performed by applying an adhesive resin tape on the support where the end of the film-like product is located. It is to be a process to attach.
[0015]
Further, the treatment for reducing the peel strength between the non-fluidized thin film-like product and the support is applied to the surface of the support on the surface of the support where the end of the film-like product is located. It is to be a process to do.
[0016]
In addition, the treatment for reducing the peel strength between the non-fluidized thin film-like formed product and the support is performed by applying a curable liquid resin composition to the portion on the support where the end of the film-formed formed product is located. That is, it is a process of curing after coating on the surface.
[0017]
Further, the fluid resin composition contains a polyamic acid composed of an acid dianhydride compound and a diamine compound.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an example of an embodiment of a method for producing a synthetic resin film according to the present invention will be described.
[0019]
The flowable resin compositions applicable to the present invention are listed below, but the present invention is not limited to the description. For example, a resin composition containing polyester, polyimide, polyamic acid, polyamide, polyether, polycarbonate, polyketone, polysulfone, polysulfur, polyolefin, etc. can be applied to the present invention. Moreover, these copolymers and blends are also applied.
[0020]
In addition, when the fluid resin composition is a polyamic acid system comprising an acid dianhydride compound and a diamine compound, a non-fluidized thin film-like formed product is obtained by performing an imidization reaction and drying while applying heat. The peel strength from the support is strong, and application of the method for producing a synthetic resin film according to the present invention is particularly preferable.
[0021]
Here, the acid dianhydride compound and the diamine compound used as the material of the polyamic acid are not particularly limited. For example, as the acid dianhydride compound, pyromellitic dianhydride, 3,3 ^′ , 4 , 4 ^'- biphenyl tetracarboxylic dianhydride, p- phenylene bis (trimellitic acid monoester acid anhydride), ^3,3', 4,4 ^'- benzophenone tetracarboxylic dianhydride, oxydiphthalic anhydride, diphenylsulfone Tetracarboxylic dianhydride etc. are mentioned. As the diamine compound, for example, para-phenylenediamine, meta-phenylenediamine, 4,4 ^'- diaminodiphenyl ether, ^3,4' - diaminodiphenyl ether, 1,4-bis (4-aminophenoxy) benzene, 1,3 Examples include bis (4-aminophenoxy) benzene, 2,2′-bis [4- (4-aminophenoxy) phenyl] propane, 4,4′-bis [4- (4-aminophenoxy) biphenyl, and the like.
[0022]
The resin composition described above may be used in a state dissolved in a solvent, or may be used in a molten state if possible.
[0023]
In the present invention, the fluid resin composition is continuously formed in a smooth thin film with a constant width on a support such as an endless belt or a drum with a slit die or an applicator. Here, the thickness of the thin film formed on the support is not limited. In addition, a slit die, an applicator, an endless belt, or a drum are those generally used in industry.
[0024]
In the method for producing a synthetic resin film according to the present invention, a treatment is performed on a support such as an endless belt or a drum necessary for production to reduce the peel strength from a non-fluidized thin film-like product by defining a treatment position. This is the gist.
[0025]
Here, in the present invention, the “processing position” refers to a position on the surface of a support such as an endless belt or a drum that performs the following processing. The treatment is performed on the portion where the end of the film-formation product is located on the support, and it is essential that the end faces of the two film-formations are always on the treated support. If the end face is not on the treated support, that is, if the end face is directly on the untreated support, there may be a crack at the beginning of the fine defect at the end and the film may break. It is.
[0026]
In the method for treating a support in the present invention, it is essential to lower the peel strength with respect to the non-fluidized thin film-like product as compared with the untreated part.
[0027]
The peel strength of the non-fluidized thin film-like formed product from the treated support in the present invention is determined by the relationship of the peel strength with the untreated part. That is, when the peel strength from the untreated support is large, the thin film-like product is not easily cracked even if the peel strength from the treated support is strong, compared with the case where the peel strength is small. It can be produced stably.
[0028]
In the present invention, both the treated portion and the untreated portion exist on the support with a certain boundary line interposed therebetween. In the present invention, when the treatment for reducing the peel strength of the non-fluidized thin film-like formation is made lower than that of the untreated portion, the thin film-like formation on the treated portion of the non-fluidized thin-film formation is peeled off. Since it occurs in preference to the untreated part, no tension is applied to the end face of the thin film-like product, and even if there is a “fine defect” at the end, there is an effect that cracks from that part do not occur. Can do.
[0029]
Here, the peel strength of the thin film-like formed product from the treated portion is preferably 80% or less, more preferably 50% or less of the peel strength of the untreated portion. Here, the “peel strength” is obtained by dividing the average value of the load when a thin film-like product having a certain width is pulled by the width so that the peel angle from the support is in the direction of 90 degrees. Is obtained.
[0030]
Next, a specific method of processing according to the present invention will be described. As for the treatment, it is an essential condition that the peel strength is smaller than that of the untreated portion due to the treatment on the support, and any one satisfying this condition can be applied. In particular,
(1) A method of sticking an adhesive resin tape on a support,
(2) A method of applying a surface treatment agent to the surface of a support,
(3) Examples include, but are not limited to, a method in which a curable liquid resin composition is applied to the support surface and then cured.
[0031]
Even if these treatments are the same treatment method, the peel strength also changes depending on the type of resin composition to be produced, the temperature, the atmosphere, and the like, and therefore the effect of the present invention also changes according to those conditions. Therefore, a treatment method suitable for the type of synthetic resin film to be produced and the usage environment should be selected.
[0032]
(1) The processing method for affixing the adhesive tape is, for example, as shown in FIG. 1, with the roll 4 provided with the adhesive resin tape 2 having a certain width placed at the processing position of the endless belt or drum 6 or the like. The endless belt or drum 6 or the like is rotated so that the roll is fed out, and an adhesive resin tape is attached to the end of the endless belt or drum. Cut the end of the winding around the endless belt or drum.
[0033]
Examples of the pressure-sensitive adhesive resin tape used in the present method include Teflon pressure-sensitive adhesive tape, polyester pressure-sensitive adhesive tape, polyolefin-based pressure-sensitive adhesive tape, polyimide pressure-sensitive adhesive tape, and polyamide pressure-sensitive adhesive tape.
[0034]
Further, there is an advantage that after the production of the resin formed product is finished, the insoluble adhesive tape can be easily peeled off and discarded. Therefore, for example, if it is necessary to produce a synthetic resin film that would make this process inconvenient using the same production machine, it can be easily discarded and restored to its original state, and the product type can be switched. Simple.
[0035]
However, since the pressure-sensitive adhesive tape usually has a thickness of several tens of μm or more, there is a step corresponding to the thickness of the pressure-sensitive adhesive tape at the cross-sectional portion of the pressure-sensitive adhesive tape. For example, if the flowable resin composition is solution-like and its thickness is so thin that it cannot be ignored compared to the step corresponding to the thickness of the adhesive tape, the thickness of the step increases, inefficient drying, etc. May cause inconvenience in the process, such as causing local insufficiency of drying. Therefore, the processing method for applying the adhesive tape is applied to a film having a relatively large film thickness.
[0036]
Next, (2) a method using a surface treating agent will be described. As the surface treatment agent, for example, in addition to fluorine-based surface treatment agents such as tetrafluoroethylene (PTFE) and tetrafluoroethylene-hexafluoropropylene copolymer (FEP), silicone-based surface treatment agents can be used. Furthermore, a plurality of combinations can be used.
[0037]
For example, as shown in FIG. 2, the rubbing roll 10 made of a base material such as a non-woven fabric is rotated in accordance with the rotation of the endless belt or the drum 12, so that the surface treatment agent solution is rotated. A surface treatment solution is applied to the end of the drum 12 with a certain width and thickness. Thereafter, the endless belt or drum 12 is heated to dry the surface treatment agent.
[0038]
The applicator may be installed at the lower part of the endless belt or drum, or at the upper part. As shown in FIG. 2, when it is in the lower part, the rubbing roll can be immersed in the liquid reservoir 14 of the surface treatment agent, and as shown in FIG. 3, the coating device is provided at the upper part of the endless belt or drum. In such a case, the surface treatment agent may be replenished by periodically spraying the surface treatment agent onto the rubbing roll 10.
[0039]
According to this method, it is possible to make a step that can be a problem in the method using the above-mentioned adhesive tape to a thickness that can be ignored (about several tens of μm or less), and there is no local lack of drying. The film thickness can be accommodated.
[0040]
Also, (3) a method of curing after applying the curable liquid resin composition, the curable liquid resin composition is applied to the end of the endless belt or drum in a certain width and thickness.
[0041]
Examples of the curable liquid resin composition used in this method include those obtained by imparting reactivity to a polyether-based or polyisobutylene-based compound by methods such as urethane modification, silicone modification, and allyl modification. Next, the curable liquid resin composition is applied using an apparatus such as that shown in FIGS. 2 and 3 to which the surface treatment agent is applied, and then the liquid resin composition is cured in an environment suitable for curing. Let
[0042]
In addition, the above-mentioned (1) method using the adhesive tape can be made to have a thickness that can be ignored (about several tens of μm or less), which can cause a problem. Thickness film can be adapted.
[0043]
The synthetic resin film according to the present invention is produced by the method as described above. From the viewpoint of improving the yield, it is desirable to set the “processing position” at an appropriate position so that the overlap width between the film-formed product and the processed portion is as small as possible. This is because if the processing position is not appropriate, there may be a case where it is not possible to ensure the overlap between the end surface of the film-formed product and the processing position due to the meandering accuracy and the like. Therefore, in consideration of the coating position accuracy of the film-formed product and the meandering accuracy of the support such as an endless belt or drum, the processing is performed so that both ends of the film-formed product are stably positioned at the processing portion on the support. The position should be determined. Moreover, it is desirable from the viewpoint of stable production that the end surface of the processing position is as parallel as possible to the film traveling direction.
[0044]
As mentioned above, although the manufacturing method of the synthetic resin film concerning this invention was demonstrated, this invention is not limited only to said example, This invention is based on the knowledge of those skilled in the art within the range which does not deviate from the meaning. The present invention can be implemented in a mode with various improvements, changes, and modifications.
[0045]
【Example】
An example of implementation by the method according to the present invention will be shown below. The peel strength was measured according to JISC 6481.
[0046]
Example 1
Two polyester tapes (Teraoka Factory 631S: thickness 25 μm × width 100 mm) were attached to a drum roll having a width of 500 mm and an outer diameter of 200 mm capable of controlling the temperature, with a circumference of 300 mm. In addition, the overlap of the joint portion of the polyester tape when pasted was 5 mm. Next, the drum roll was kept at 130 ° C. and rotated at a speed of 20 minutes / circulation, and a DMF solution of polyamic acid composed of pyromellitic dianhydride and diaminodiphenyl ether was fixed at a constant width of 1 mm thickness × 450 mm width using a knife coater. And continuously applied to the previous drum roll. When the non-fluidized polyamic acid film was continuously peeled off at the place where it stayed on the rotating drum for 15 minutes, the polyamic acid film never cracked during the 3-hour experiment. The peel strength of the polyamic acid film on the polyester tape was 10 gf / cm, and the peel strength of the polyamic acid film on the drum to which the polyester tape was not attached was 200 gf / cm.
[0047]
(Example 2)
After spraying a heat-resistant Teflon TFE coat (manufactured by Fine Chemical Japan Co., Ltd.) on the same position as the adhesive tape affixed in Example 1 on the same drum roll as in Example 1, the drum roll was cured at 150 ° C. for 24 hours. A fluororesin film was formed on the surface. Thereafter, an experiment was performed in the same manner as in Example 1. As a result, the polyamic acid film never cracked during the 3-hour experiment. The peel strength of the polyamic acid film on the fluororesin coating was 5 gf / cm.
[0048]
(Example 3)
A silicone sealing material (TSE399 manufactured by Toshiba Silicone Co., Ltd.), which is a curable liquid resin composition, is applied to the same position as the adhesive tape attached in Example 1 on the same drum roll as in Example 1, and 24 hours at room temperature. It was allowed to stand for a period of time and cured to form a silicone rubber coating on the drum roll surface. Thereafter, an experiment was conducted in the same manner as in Example 1. As a result, the polyamic acid film never cracked during the 3-hour experiment. The peel strength of the polyamic acid film on the silicone rubber coating was 10 gf / cm.
[0049]
(Comparative Example 1)
Except that the polyester tape was not applied, all the experiments were performed under the same conditions as in Example 1. As a result, cracks started from the end of the polyamic acid film about once every 5 minutes. Disconnected.
[0050]
From Examples 1 to 3 and Comparative Example 1, the synthetic resin film production method of the present invention can stably produce a synthetic resin film without causing cracks, and the present invention is an excellent method. Recognize.
[0051]
【The invention's effect】
As described above, the method for producing a synthetic resin film according to the present invention is a simple method characterized by performing a treatment for reducing the peel strength of a part of the support surface when producing a synthetic resin film, It can be implemented at low cost without introducing new equipment. In addition, the synthetic resin film production method of the present invention can produce a synthetic resin film stably without causing any cracks in the thin film-like product without affecting the properties of the resulting synthetic resin film. Can do.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an example of a method for attaching an adhesive resin tape.
FIG. 2 is a perspective view showing an example of a method for applying a surface treatment agent and a curable liquid resin composition.
FIG. 3 is a perspective view showing another example of a method for applying a surface treating agent and a curable liquid resin composition.
[Explanation of symbols]
2; adhesive resin tape 4; roll 6; endless belt or drum 10; rubbing roll 12; endless belt or drum 14;

Claims (4)

A flowable resin composition containing a polyamic acid composed of an acid dianhydride compound and a diamine compound is continuously formed on a support in the form of a thin film having a certain width , and then the non-fluidized thin film-like product is formed as described above. the method of manufacturing a synthetic resin film is peeled off from the support, the support, the a portion widthwise end portions of the thin film-like formations are located, peeling of the non-fluidized thin film formation and the support method for producing a synthetic resin film processed to reduce the strength, characterized in that which is facilities. Before Kisho management method of producing a synthetic resin film according to claim 1, widthwise end portions of the thin film formation is characterized in that it is a paste processing an adhesive resin tape portion located. Before Kisho management method of producing a synthetic resin film according to claim 1, widthwise end portions of the thin film formation is characterized in that it is a process of applying a surface treatment agent in a portion located. Synthetic resin film before Kisho sense is, according to claim 1, wherein the end portion in the width direction of the thin film formation is a process of curing after applying the curable liquid resin composition in a portion located Manufacturing method.

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