PET Film

Abstract

To provide a PET film for ultraviolet blocking as a composition for ultraviolet blocking, that contains a calix[4]arene organic polymer as an active ingredient.SOLUTION: An ultraviolet blocking chip contains a polyethylene terephthalate (PET) base, and a calix[4]arene organic polymer of 10-30 pts.wt. relative to the base 100 pts.wt.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a composition for blocking ultraviolet rays, which comprises a calix[4]arene-based organic polymer as an active ingredient, a PET film for blocking and suppressing ultraviolet rays, and a PET film for blocking and suppressing ultraviolet rays and infrared rays, which comprises the PET film. [Background technology]

[0002] Ultraviolet rays are a wavelength band of light that is invisible to our eyes. They can burn human skin and have a sterilizing effect, but excessive exposure to ultraviolet rays can also cause skin cancer and eye diseases such as conjunctivitis and cataracts.

[0003] On the other hand, recently, due to an abnormality in the ozone layer caused by environmental pollution, the amount of ultraviolet rays reaching the earth's surface is increasing, and as a result, damage to the human body caused by ultraviolet rays, such as accelerated aging, formation of wrinkles in the skin, induction of mutations, and induction of cancer, is becoming more and more common. It is known that ultraviolet rays that reach the earth's surface after passing through the ozone layer penetrate into the epidermis of the skin, causing erythema, freckles, edema, etc., and penetrate into the dermis of the skin, causing skin cancer, wrinkles, and promoting the formation of melanin, thereby causing skin aging and skin irritation.

[0004] For this reason, transparent films with ultraviolet blocking and suppression functions are now being used on car windows and building glass to prevent people from being unwittingly exposed to ultraviolet rays in their daily lives.

[0005] As a result, there has been active effort to develop a wide variety of UV-blocking films. Up until now, films that block light up to the 370 nm wavelength band have been used. However, these films have difficulty blocking UV rays in the range extended up to 400 nm, and there is still room for the risk of causing skin cancer, xerophthalmia, cataracts, and reduced eyesight.

[0006] In addition, a method of blocking ultraviolet rays by coating the surface of a film with a coating liquid may be used. However, the production of such a coated film requires special equipment and / or complicated processes, which is disadvantageous for mass production. Even if the film is produced, the production costs will rise, which leads to increased costs and is therefore not suitable for commercialization. Summary of the Invention [Problem to be solved by the invention]

[0007] For this reason, we made extensive efforts to find a method that could provide an excellent UV-blocking film using a simple process while maintaining transparency and / or flexibility. As a result, we prepared a master chip containing a basic PET base and a specified amount of calix[4]arene-based organic polymer, which has been confirmed to have excellent UV-blocking properties as an active ingredient, and mixed this with the base chip to produce a film that maintains the transparency and flexibility of the PET film itself but can block more than 99%, and even 99.9%, of light in the entire range of 250 to 400 nm, which led to the completion of the present invention.

[0008] The present invention also provides a PET film for blocking and suppressing ultraviolet and infrared rays, which includes the PET film for blocking and suppressing ultraviolet rays of the present invention and has a coating layer for blocking and suppressing infrared rays, and which maintains sufficient light transmittance.

[0009] One object of the present invention is to provide an ultraviolet ray blocking chip or an ultraviolet ray blocking film layer, comprising a polyethylene terephthalate (PET) base and 10 to 30 parts by weight of a calix[4]arene-based organic polymer, based on 100 parts by weight of the base.

[0010] Another object of the present invention is to provide a PET film produced by mixing a polyethylene terephthalate (PET) base chip with 10 to 20 parts by weight of the ultraviolet ray blocking chip or ultraviolet ray blocking film layer according to claim 1 or 2, based on 100 parts by weight of the base chip.

[0011] It is still another object of the present invention to provide a method for producing a PET film for blocking ultraviolet rays, the method comprising: a first step of preparing an ultraviolet ray blocking chip or an ultraviolet ray blocking film layer containing the PET base and a calix[4]arene-based organic polymer; a second step of melt-mixing the PET base chip and 10 to 20 parts by weight of the ultraviolet ray blocking chip or the ultraviolet ray blocking film layer, based on 100 parts by weight of the base chip; and a third step of pressing the molten mixture obtained from the previous step to form a sheet.

[0012] The present invention also provides a PET film for blocking ultraviolet rays and infrared rays, which includes a PET film for blocking ultraviolet rays and has a coating layer for blocking infrared rays, and which maintains sufficient light transmittance. [Means for solving the problem]

[0013] In one embodiment for achieving the above object, the present invention provides an ultraviolet-blocking film layer, which is prepared by mixing a polyethylene terephthalate (PET) base and a calix[4]arene-based organic polymer in a ratio of 15 to 30 parts by weight of the calix[4]arene-based organic polymer per 100 parts by weight of base chips to prepare an ultraviolet-blocking chip, and then mixing the prepared ultraviolet-blocking chip with 100 parts by weight of PET base chips in a ratio of 10 to 20 parts by weight to form a film. The above may also be a manufacturing method.

[0014] For example, the calix[4]arene-based organic polymer may be a polymer represented by the following general formulas (1) to (3), but is not limited thereto:

[0015] [ka]

[0016] [ka]

[0017] [ka]

[0018] Specifically, the polymer may be any one of the polymers represented by general formulas (1) to (3) used alone, or two or more types of polymers may be mixed and used, but is not limited thereto.

[0019] There is provided an ultraviolet-blocking PET film comprising a polyethylene terephthalate (PET) base layer and the ultraviolet-blocking film layer described above. The above may also be a manufacturing method.

[0020] The thickness of the produced film is selected within the range of 20 to 50 μm. The above may also be a manufacturing method.

[0021] The present invention provides the ultraviolet-blocking PET film described above, which blocks 99.9% or more of ultraviolet light in the range of 280 nm to 315 nm and 99.9% or more of ultraviolet light in the range of 315 nm to 400 nm. The above may also be a manufacturing method.

[0022] The present invention provides a method for producing a PET film for blocking ultraviolet rays, the method comprising: a first step of preparing an ultraviolet ray blocking chip containing the above-described PET base and a calix[4]arene-based organic polymer; a second step of melt-mixing the PET base chip and 10 to 30 parts by weight of the ultraviolet ray blocking chip, based on 100 parts by weight of the base chip; and a third step of forming a sheet by applying the molten mixture obtained from the above step to another film layer.

[0023] The film for blocking ultraviolet and infrared rays includes a far-infrared blocking coating layer, a first film layer, a near-infrared blocking coating layer, and a second film layer. The far-infrared blocking coating layer is a layer formed by mixing an inorganic metal oxide, a diluting solvent, an additive, a photocatalyst, and a wetting dispersing agent with a resin and coating the layer. The inorganic metal oxide is antimony tin oxide or indium tin oxide, and preferably indium tin oxide. The mixture is 30% to 40% resin, 40% to 50% inorganic metal oxide, 5% to 10% organic solvent having polarity as the diluting solvent, 1% to 5% photocatalyst, and 1% to 3% wetting dispersing agent for preventing aggregation of the inorganic metal oxide, based on 100 parts by weight. The first film layer and the second film layer are The PET film has the function of a base film mainly composed of polyester, and the near infrared blocking coating layer is a mixture of urethane resin, dimonium, diluting solvent, and additives, the mixture ratio being 55% to 70% urethane resin, 1.5% to 5% dimonium, 20% to 30% diluting agent, and 4% to 8% benzophenone-based ultraviolet stabilizer for improving light resistance based on 100 parts by weight of the mixture, and the benzophenone series is contained as an antioxidant to improve the light resistance of the dimonium, and the ultraviolet blocking coating layer contains a calix[4]arene-based organic polymer as an active ingredient, and is characterized by blocking and suppressing infrared rays, infrared rays, and heat rays.

[0024] The ultraviolet blocking coating layer is the ultraviolet blocking film layer according to claim 1 or 2.

[0025] The present invention provides a PET film as described in the preceding paragraph, which blocks and suppresses infrared rays in the range of 780 nm to 1300 nm and infrared rays beyond 1300 nm, blocks and suppresses heat rays, and blocks and suppresses ultraviolet rays in the range of 280 nm to 315 nm and ultraviolet rays in the range of 315 nm to 400 nm.

[0026] The visible light transmittance is set to a range of 88% to 96%, the infrared transmittance is set to a range of 2% to 3.2%, the ultraviolet transmittance is set to 0%, and the film thickness is set to a range of 33 μm to 41 μm. It may be a feature.

[0027] The PET film described above is characterized by having a visible light transmittance in the range of 70% to 77%, an infrared transmittance of 0%, an ultraviolet transmittance of 0%, and a film thickness in the range of 44 μm to 56 μm.

[0028] The film produced according to the present invention may contain 1.5 to 5 parts by weight of the calix[4]arene-based organic polymer based on 100 parts by weight of the total PET base used, but is not limited thereto.

[0029] For example, the produced film may have a thickness of 20 to 50 μm, and further, the thickness may be uniformly formed to have a deviation of within 1%, even ±1 μm, but is not limited thereto.

[0030] Specifically, the prepared film may block 99.9% or more of light in the ultraviolet A and ultraviolet B ranges.

[0031] In yet another aspect, the present invention provides a method for producing a PET film for blocking ultraviolet rays, the method including: a first step of preparing an ultraviolet ray blocking chip comprising the PET base and a calix[4]arene-based organic polymer; a second step of melt-mixing the PET base chip and 10 to 20 parts by weight of the ultraviolet ray blocking chip, based on 100 parts by weight of the base chip; and a third step of pressing the molten mixture obtained from the previous step to form a sheet.

[0032] In the manufacturing method of the present invention, after the third step, if necessary, any one of i) a longitudinal stretching step, ii) a primer coating step, iii) a transverse stretching step, or iv) a winding step may be further performed, but is not limited thereto.

[0033] The manufacturing method of the present invention may be carried out by a method used in a pseudo process known in the art, either as is or with appropriate modifications, but is not limited thereto. Effect of the Invention

[0034] The PET film of the present invention exhibits excellent performance, such as blocking more than 99.9% of both ultraviolet A and ultraviolet B light even when thinned to less than 50 μm, and contains a calix[4]arene-based organic polymer as an active ingredient in a small amount of approximately 5 parts by weight in the final product.Since it is easy to mold and has excellent flexibility, it can be used as an ultraviolet blocking film that is easy to apply to coated objects.

[0035] In addition, the PET film of the present invention is characterized by having a high transparency with a visible light transmittance in the range of 70% to 96%, while having an infrared transmittance in the range of 0% to 3.2%, an ultraviolet transmittance of 0%, and a film thickness in the range of 33 μm to 56 μm.

[0036] That is, the PET film of the present invention has the revolutionary effect of having an ultraviolet ray transmittance of 0%. In addition, by setting the infrared ray transmittance to 0% or within the range of 3.2% or less, it has the effect of substantially suppressing the blocking of heat rays. Furthermore, since it has been possible to realize a thin film thickness while maintaining these blocking and suppressing capabilities, it has the ease of processing, such as attachment to curved glass.

[0037] In addition, the PET film of the present invention has high transparency with a visible light transmittance in the range of 70% to 96%, and therefore has the advantage that it can be attached even in cases where high transparency is required, such as automobile windshields. [Brief description of the drawings]

[0038] [Figure 1] FIG. 2 is a schematic diagram showing a manufacturing process of a calix[4]arene-based organic polymer-containing PET film according to one embodiment of the present invention. [Diagram 2] 1 is a schematic diagram illustrating a manufacturing process of a PET film for blocking ultraviolet rays according to an embodiment of the present invention. [Diagram 3] FIG. 2 is a graph showing the transmittance in the range of 250 to 450 nm for a calix[4]arene-based organic polymer-containing PET film prepared according to one embodiment of the present invention. [Figure 4] 1 is a graph showing test results of the spectral transmittance of the PET film (1) of the present invention. [Diagram 5] 1 is a graph showing test results of the spectral transmittance of the PET film (2) of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0039] The present invention will be described in more detail below with reference to examples. However, these examples are merely for illustrative purposes and the scope of the present invention is not limited to these examples.

[0040] Example 1: Preparation of PET film for blocking ultraviolet rays A polymer of the above general formula (1) to (3) was mixed as an ultraviolet blocking component into a base chip used for a normal PET film to prepare an ultraviolet blocking chip. At this time, the content was adjusted to 15 to 30 parts by weight based on 100 parts by weight of the base chip. Next, 10 to 20 parts by weight of the prepared ultraviolet blocking chip was mixed into 100 parts by weight of the PET base chip and formed into a film. Specific steps according to the present invention are shown in Figures 1 and 2.

[0041] Experimental example 1: Confirmation of UV blocking ability In order to confirm the UV blocking ability of the film prepared according to Example 1, the transmittance in the range of 250 to 450 nm was measured, and the results are shown in Figure 3 and the following Table 1. As shown in Figure 3 and Table 1, it was confirmed that the film according to the present invention can block 99.9% or more of UV rays in the range up to 400 nm.

[0042] [Table 1]

[0043] Experimental Example 2: Experiment on blocking various types of light with the PET film (1) of the present invention The present application Paragraph 26 The invention (PET film (1) of the present invention) based on the invention described above was tested for its effect of suppressing the blocking of various types of light. The thickness of the PET film (1) of the present invention is 38 μm. The test results are shown in the table below and in FIG. 3. FIG. 3 is a graph showing the test results of the spectral transmittance. Using a SolidSpec-3700DUV (Shimadzu Corporation), the test was performed by applying light perpendicular to the PET film (1) of the present invention. TIFF0007653122000005.tif134166

[0044] Experimental Example 3: Experiment on blocking various types of light with the PET film (2) of the present invention The present application Paragraph 27 states: The invention based on the above-mentioned invention (the PET film (2) of the present invention) was tested for its effect of suppressing the blocking of various types of light. The thickness of the PET film (2) of the present invention is 50 μm. The test results are shown in the table below and in FIG. 4. FIG. 4 is a graph showing the test results of the spectral transmittance. Using a SolidSpec-3700DUV (Shimadzu Corporation), the test was performed by applying light incident perpendicularly to the PET film (2) of the present invention. TIFF0007653122000006.tif134166

Claims

1. at least, A step of manufacturing an ultraviolet ray blocking chip by mixing a polyethylene terephthalate (PET) base and a calix[4]arene-based organic polymer in a ratio of 15 to 30 parts by weight of the calix[4]arene-based organic polymer based on 100 parts by weight of the base chip; Mixing the prepared UV blocking chip in a ratio of 10 to 20 parts by weight with 100 parts by weight of a PET base chip and forming the mixture into a film; A method for producing an ultraviolet ray blocking film comprising the steps of:

2. 2. The method for producing an ultraviolet blocking film according to claim 1, wherein the calix[4]arene-based organic polymer is a polymer represented by one or more of the following general formulas (1) to (3): 【Chemistry 1】 【Chemistry 2】 【Chemistry 3】

3. Characterized in that it comprises a polyethylene terephthalate (PET) base layer, A method for producing the ultraviolet ray blocking PET film according to claim 1 or 2.

4. The method for producing an ultraviolet ray blocking PET film according to claim 3, wherein the thickness of the produced film is selected in the range of 20 to 50 μm.

5. 5. The method for producing an ultraviolet ray blocking PET film according to claim 3, wherein the film blocks 99.9% or more of ultraviolet rays in the range of 280 nm to 315 nm and 315 nm to 400 nm, respectively.

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