KR20040072862A - Biaxially stretched polyester film for windows film - Google Patents

Abstract

PURPOSE: Provided is a biaxially oriented color polyester film for glass windows of vehicles and buildings, which protects privacy, screens ultraviolet rays and heat rays, and prevents flakes of glass from flying away when the glass is broken by an impact of the outside. CONSTITUTION: The biaxially oriented polyester film has a polyester transparent layer(A layer), a polyester color layer(B layer) containing 0.01-10wt% of a dye, and a coating layer(C layer) having an adhesive property, wherein at least one layer of the three layers contains 0.01-5wt% of a UV stabilizer selected from a UV absorbent such as a benzophenone, a benzotriazole, a resorcinol monobenzoate, a salicylate, a hydroxy benzoate, a formamidine, a hindered amine-based UV stabilizer, or an imino ester-based UV stabilizer.

Description

Biaxially stretched polyester film for window film

The present invention is attached to the window glass surface of automobiles, buildings, etc. to block the transmission of ultraviolet rays and heat rays in the sun, to protect the privacy from the outside and at the same time to prevent the scattering of glass fragments when the glass is broken by a sudden impact, safety The present invention relates to a biaxially stretched colored polyester film for window films that can lead to accidents.

Polyester Polyethylene terephthalate is widely used as a polymer processed product because of its excellent physical and chemical properties. In particular, polyethylene terephthalate film is used as an industrial material for a wide range of applications. In addition, it is mainly used as a substitute for labeling, transfer, packaging, photography, and image. Regarding the window film using the polymer material, in particular, the colored polyester film, Korean Patent Registration No. 10-0252022 describes the preparation of a dye mixture composed of a dispersion liquid in which at least one dispersion dye is dispersed in an aqueous paint solution. Process and coating the dye mixture on a polyester film to form a coating layer and heating the film so that at least one dye is transferred from the coating layer into the film, wherein the viscosity of the dye mixture is 500 cm at room temperature. There has been disclosed a method for producing a colored polyester film, characterized in that it is less than a pois. In Korean Patent Registration No. 10-0067877, at least one layer of colored adhesive colored by a colorant on at least one side of the transparent film is disclosed. A layered colored film, wherein the colored adhesive layer is polyester as an adhesive And a resin, the coloring agent is a colored film composed introduced, including a pigment and a polyester dispersant. In addition, Japanese Laid-Open Patent Publication No. Hei 10-230577, US Patent No. 6,242,081 and Korean Patent Registration No. 10-0082060 disclose a laminated polyester film for automobile window glass bonding comprising three or more layers including an intermediate layer containing dye. have. Japanese Laid-Open Patent Publication No. 2002-52675, US Patent USP 2002/0064650 A ₁ and Korean Patent Registration No. 10-0013726 consist of at least three layers of polyester coextruded laminated films containing dye in an intermediate layer, and at least one side of the film. A biaxially oriented polyester film for window glass has been introduced, which has an antistatic coating (having an intrinsic surface resistance of 10 ¹⁴ kPa or less). In addition, Korean Patent Registration No. 10-0145057 contains 0.1 to 0.01 wt% of a magnesium compound, and 100 to 1000 ppm of the total amount of the polyester resin is added to the polyester resin condensation-polymerized by a conventional method using an anthraquinone dye as a colorant. Disclosed is a method for producing a biaxially stretched polyester film obtained by mixing a polyester resin and a polyester resin to which a colorant is not added at a constant ratio and forming, stretching, and heat treating the polyester resin.

Korean Patent Registration No. 10-068300 is diluted with a coating resin and a solvent of one or two or more mixed resins selected from acrylic, vinyl, polyester, and polyamide resins on a cross section of a polyester film to which a hard coat layer is applied. Disclosed is a method of manufacturing a solar control film prepared by applying a coating solution composed of 0.5 to 5 wt% of a solvent-soluble dye and 1 to 5 wt% of a benzotriazole-based or triazine-based ultraviolet absorbent. In addition, Korean Patent Registration No. 10-018537 forms a release peeling layer, an adhesive layer, and an antifog layer on a support film to disperse a hydrophilic polymer or a water-repellent polymer material in a polymer binder in order to form an antifog layer. It describes a method for producing a solar control film, characterized in that the coating. Korean Patent Registration No. 10-018538 is a solar control film manufactured by forming a release peeling layer, an adhesive layer, and a hard coating layer on a base film, wherein the adhesive layer is an organic compound having a large absorption wavelength region in the near infrared region of the adhesive resin. The manufacturing method of the solar control film which apply | coats the adhesive agent which mix | blended the heat ray absorber, and mix | blends dye with the resin for ultraviolet curing is known as a hard-coat layer.

In general, the solar control film is mainly composed of polyethylene terephthalate film, it is used not only to block the sunlight but also to enhance the safety of the window glass due to the strong physical properties of the polyethylene terephthalate film, such a solar control film aka "safety film" " More detailed purposes of the use of such films are firstly used for the blocking of sunlight. That is, by reducing the solar light transmittance, it is possible to increase the cooling and heating efficiency and to prevent glare, to protect the privacy by the semi-mirror effect, and to prevent skin aging by blocking the sun.

Secondly, it is used to prevent a second accident, which may occur due to the scattering of broken window glass fragments due to an accident or a strong impact. That is, this is made by the strong physical properties and adhesion of the polyethylene terephthalate film used as the substrate (support). Third, it is used for decorative purposes to enhance the appearance quality of automobiles and buildings and to satisfy various tastes of consumers by expressing various colors by coloration. When the film having such various functions is generically named as a window film, the window film may be classified into a functional film, a solar control film, a scattering prevention film, and a heat insulating film. Insulation film, also called "heat-blocking film", is first attached to the window glass to remove the sun as the interest in energy saving is increasing demand for building window film. The thermal insulation film is formed by applying an aluminum protective layer to a polyethylene terephthalate film having a thickness of 25 to 100 μm and a pressure-sensitive adhesive on the opposite side, and forming a protective layer on the pressure-sensitive adhesive layer or another layer to which the pressure-sensitive adhesive is applied, There exist some which mixed the coloring agent.

The film having such a structure has a function of improving the indoor environment by attaching to the inside of the window glass to reflect or absorb sunlight. Glass scattering prevention film is a film that is applied to the transparent polyethylene terephthalate film pressure-sensitive adhesive, peel off the overcoat film to be applied to the entire inner surface of the window glass to prevent the fragments from scattering even if the glass is broken.

In many cases, glass shatterproof films also function as a heat insulating film. That is, the blocking effect of sunlight is large, the cooling and heating efficiency is increased, and the secondary disaster upon glass breakage is prevented. It also has a half-mirror effect, improving the appearance of the building. Solar control film is mainly made of automotive tinting film, which has a unique purpose of blocking light, but its main purpose is changing to decorative vehicles. Current solar control films are mostly products that combine the functions of the existing heat insulation film and glass scattering prevention film. Solar control film can be divided into automotive and building.

Automotive is decorative for sun protection and internal privacy protection of automotive glass. The windshield of the car is fitted with laminated glass for the car, and is applied to the side and rear glass except the driver's window glass. Side and rear glass use tempered glass rather than laminated glass to facilitate the escape of the occupant in the event of an accident.

The building is used for the purpose of improving the cooling and heating efficiency, protecting the privacy and improving the appearance.

An object of the present invention is to provide a color film to be used in buildings and automobile window glass. The color film of the present invention is expected to develop various uses due to the multifunctionality or high functionality of the color film as a solar control film in the future, and in particular, the biaxially stretched polyester coloring film to be used in automobiles and buildings is not only a function of the safety film but also Privacy protection should also be provided.

However, in the conventional colored film, since thermoplastic resins are widely used, the thermoplastic resin has a defect that is not stable to ultraviolet rays due to the structure of the material, and directly affects the decomposition of the polymer material by contact.

Therefore, in order to minimize the decomposition of the polymer material by ultraviolet light by using a UV stabilizer having an aromatic structure to block the photolysis of the polymer material to improve the overall characteristics of the color film such as discoloration, surface cracking, mechanical properties deterioration It is a task.

1 is a cross-sectional view showing the basic configuration of the polyester film of the present invention.

2 is a cross-sectional view of a colored film showing an embodiment of the present invention.

3 is a cross-sectional view of a colored film showing another embodiment of the present invention.

Figure 4 is a cross-sectional view of a colored film showing another embodiment of the present invention.

5 is a cross-sectional view of a colored film showing another embodiment of the present invention.

6 is a cross-sectional view of a colored film showing another embodiment of the present invention.

7 is a cross-sectional view of a colored film showing another embodiment of the present invention.

<Explanation of main code in drawing>

1: transparent layer 2; Color layer

3: coating layer 4: adhesive layer

5: deposition layer 6: transparent film layer

The present invention is to solve the above problems, at least 3 consisting of a polyester transparent layer (A layer) and a polyester color layer (B layer) containing 0.01 to 10% by weight of dye and an adhesive coating layer (C layer) A biaxially stretched polyester colored film for window films comprising an open layer structure (A layer / B layer / C layer), one of which contains 0.01 to 5% by weight of an ultraviolet stabilizer. It is a polyester colored film that blocks UV rays and heat rays of the sun when used on the window glass surface of automobiles and buildings, and completely prevents the glass from scattering when broken by external impact.

MEANS TO SOLVE THE PROBLEM As a result of earnestly examining in order to achieve the said objective, as a result of earnest examination, the polyester transparent layer (A layer), the polyester color layer (B layer) containing 0.01-10 weight% of dyes, the coating layer (C layer) etc. which provided adhesiveness, etc. Biaxially stretched color film (1) having three layers (A layer / B layer / C layer) structure, and containing at least one of 0.01-5% by weight of UV stabilizer; A color film (2) comprising the pressure-sensitive adhesive layer (D layer) formed on the other side of the transparent layer (A layer); In the color film (1), the color film (3) comprising a deposition layer (E layer) formed on the other side of the coating layer (C layer); A color film (4) comprising the pressure-sensitive adhesive layer (D layer) formed on the other side of the deposition layer (E layer); In the color film (2), a color film (5) comprising a transparent film layer (F layer) laminated on the outer surface of the adhesive layer (D layer); A color film (6) comprising the pressure-sensitive adhesive layer (D layer) formed on the other side of the transparent film layer; In the said color film 4, it consists of the color film 7 which laminated | stacked the pressure-sensitive adhesive layer (D layer) and the transparent film layer (F layer) formed in the other surface of the transparent layer (A layer).

In general, thermoplastic resins, including polyesters, are not stable to ultraviolet light due to the structure of the material. Ultraviolet rays have a high wavelength of 200-400nm, which directly affects the decomposition of polymer materials by contact with polymer materials. In order to minimize the decomposition of the polymer material by ultraviolet light, a light stabilizer is generally added to the polymer material. As light stabilizers, compounds having an aromatic structure are mostly used, and photodegradation of the polymer material by ultraviolet rays is blocked by these structures. In more detail, plastics and film products cause aging when used outdoors, and the main cause is due to ultraviolet rays of sunlight. Ultraviolet energy with a wavelength range of 200 to 400 nm destroys chemical bonds of polymers, resulting in chain cutting and crosslinking. Free radicals are generated, ultimately causing discoloration, cracking of the product surface and deterioration of mechanical properties. Such degradation of the polymer material can be prevented by adding an ultraviolet stabilizer to the polymer processed product or the polymer film. In other words, UV stabilizers are compounds that interfere with or inhibit the physical and chemical processes of physical property degradation caused by light. The property degradation reaction by ultraviolet rays is a reaction carried out in the presence of oxygen in the air, and is essentially an oxidation reaction initiated by ultraviolet rays and accelerated. The action of the ultraviolet stabilizer is a method by absorbing ultraviolet rays, a method of blocking ultraviolet rays to prevent internal decomposition, and a method by absorbing reactive radicals. In general, a suitable combination of antioxidants and UV stabilizers is most ideal. The stabilization mechanism of the UV stabilizer is expressed in two ways.

First, the light blocking agent is a method of blocking the UV energy or selectively absorbing the UV energy to release other forms of energy that do not harm the polymer material or to suppress the photolysis initiation reaction by suppressing the chromophore of the activated polymer material. UV absorbers, canchers, etc. belong to this category.

Second, radical scavengers, peroxide decomposers, hindered amine stabilizers, etc. are included as a method of inhibiting photodegradation growth reactions by reacting with free radicals or hydrogen peroxide to stop free radicals and decomposing peroxides during photodegradation. The basic principle of ultraviolet absorption is to absorb ultraviolet wavelengths that are harmful to the resin and release them in heat and other stable forms. In order for UV absorption to have a high absorption capacity, it must be a compound having a very stable molecular structure. The reason is that when the absorbed light energy is released in other forms, it is easy to cause a reaction by itself due to the high energy.

Commonly used ultraviolet absorbers include hydroxy benzophenone and hydroxy phenylbenzotriazole. Although the benzophenone-based ultraviolet stabilizer is excellent in compatibility with the resin and used in various ways, the ultraviolet absorption ability of 340 nm or more is inferior to that of the benzotriazole-based ultraviolet stabilizer. The benzotriazole series has a wide range of absorption ability and is mainly used for colorless and high grade products. In addition, there are ultraviolet absorbers such as resorcinol monobenzoate, salicylate, hydroxy benzoate and formamidine. And the capture of free radicals, unlike the removal of energy sources, captures the free radicals that are the mediators of oxidation.

The method of making the resin safe for ultraviolet rays by the capture of free radicals was developed relatively late, probably only after it was found that phenone-based antioxidants, active inhibitors of free radicals, had little effect on UV oxidation. Representative ultraviolet stabilizers by free radical scavenging include hindered amines (HALS), which are easily oxidized and converted into nitrooxy radicals, producing polymeric radicals and reactive hydroxyamine ethers. Unlike UV absorbers, hindered amines have excellent surface protection and can be applied to products having a thin cross section, and thus demand is gradually increasing with the development of special grades. In addition, a cyclic imino ester compound having two carbon atoms constituting an aromatic nucleus and an imino ester ring as described in US Pat. No. 4,446,262 may be used as an ultraviolet stabilizer. Imino ester UV light stabilizers have excellent thermal stability and oxidation stability.

The present invention provides a color film to be used in buildings and automobiles, the present invention

The solar control film is expected to be used in a variety of applications since it is a multifunctional and highly functional color film. In addition, the biaxially stretched polyester film of the present invention to be used in automobiles and buildings is to provide not only the function of the safety film but also the function of privacy protection to the outside. As follows.

As shown in FIG. 1, the colored film of the present invention includes a polyester transparent layer (A layer), a polyester color layer (B layer) containing 0.01 to 10% by weight of a dye, a coating layer (C layer), etc. A biaxially stretched color film 1 comprising an open layer (A layer / B layer / C layer), at least one of which contains 0.01 to 5% by weight of an ultraviolet stabilizer, wherein the transparent layer (A layer) and color 0.01 to 1% by weight of inorganic particles having an average particle diameter of 0.05 to 5 µm are contained in at least one of the layers (B layer), and the coating layer (layer C) has a polyester having a thickness of 0.01 to 1 µm in order to impart adhesion. The adhesive layer of the acrylic, acrylic, and polyurethane is formed, and as the ultraviolet light stabilizer, ultraviolet rays such as benzophenone, benzotriazole, resorcinol monobenzoate, salicylate, hydroxy benzoate, and formamidine are used. UV absorbers or hindered amines, imino esters It is characterized by containing a stabilizer and the like.

In addition, as shown in FIG. 2, the present invention provides a color film 2 having a structure in which a pressure-sensitive adhesive layer (D layer) is laminated on the other side of the transparent layer (A layer) of the color film 1 and FIG. 3. As shown in FIG. 4, the color film 3 having a structure in which a deposition layer (E layer) is laminated on the other side of the coating layer (C layer) of the color film 1 and as shown in FIG. The color film 4 of the structure which laminated | stacked the pressure-sensitive adhesive layer (D layer) on the other surface of the vapor deposition layer (E layer) of (3), and the adhesive agent of the said color film 2 as shown in FIG. As shown in FIG. 6, the transparent film layer (F layer) of the color film (5) having a structure in which the transparent film layer (F layer) is laminated on the outer surface of the layer (D layer). The pressure-sensitive adhesive layer on the other side of the color film 6 having a structure in which the pressure-sensitive adhesive layer (D layer) is laminated on the other side and the transparent layer (A layer) of the color film 4 as shown in FIG. 7. (D layer) and transparent film layer (F layer) in turn It is to be included in a laminated structure.

In the present invention, by adding an additive to a polyester coloring film to impart a function, the additive used may be classified into inorganic particles and organic compounds. The inorganic particles can be divided into one-dimensional particles, two-dimensional particles, and three-dimensional particles. The one-dimensional particles include ulstonite, grass fibers, carbon fibers, aramid fibers, and the like. The particles include talc and mica, and the three-dimensional particles may include calcium carbonate series, silicate series, and the like. Among the particles most effectively used is silica. Examples of the organic compound include dyes, flame retardants, ultraviolet stabilizers, infrared absorbers, and copolymers.

Among the organic compounds, organic dyes are not widely used for polyester films. Among the various polymer processes used to produce polyester products, the film process requires a high level of skill, and the use of organic dyes has been limited because the process is complicated. In more detail, the dye undergoes a high temperature polymer melting process, causing casting problems and contaminating the tenter. In this patent, low turbidity (haze) can be obtained by inputting the surface roughness of the film in advance using co-extrusion technology and inorganic particle design technology to control the surface characteristics of the particle film.

In the present invention where the material properties are different, the substrate can solve problems such as extrusion instability caused by understanding the flow mechanism of each material. As the inorganic particles, silicon dioxide (silica) is mainly used. In addition, even if the amount of particles is large, it is possible to adjust the required turbidity (haze) according to the thickness of the coextrusion layer.

In the present invention, the main physical properties were measured by the method of ASTM D 1003 in the case of turbidity (haze), and the adhesive properties were measured by the method of ASTM D 3359. Evaluation of the adhesion to the ink is shown as the evaluation criteria of the cross-cut tape test among the X-cut tape test and cross-cut tape test shown in ASTM D 3359.

That is, it is cleared as below by 6 grades of 5B, 4B, 3B, 2B, 1B, 0B.

5B: The edge of the cut part is completely smooth and the grid is not square.

4B: A small piece of coating falls at the intersection of the lattice and the affected area is 5% or less.

3B: A small piece falls at the intersection of the edge and the cut and the affected area is 5% to 15% of the grid.

2B: Some of the applied edges and squares fall into pieces and the area affected is 15% to 35% of the grid.

1B: The coating is peeled off in the form of a large strip along the edge of the cut, all squares fall off, and the affected area is 35% to 65% of the grid.

0B: Peeled off, separated, worse than 1B, and affected area is more than 65%.

The ultraviolet stability of the film was evaluated by the average value of the ultraviolet-ray blocking rate in the wavelength range of 310-380 nm using the ultraviolet spectrometer, and was calculated | required by following formula (1).

Mean UV protection rate = 100-{(T ₁ + T ₂ ) x 0.36+ (T ₃ + T ₄ ) x 0.14} ..... Equation (1)

here,

T ₁ : Maximum transmittance in the 310 ~ 360nm wavelength range

T ₂ : minimum transmittance in the wavelength range of 310 ~ 360nm

T ₃ : Transmittance at Wavelength 360nm

T ₄ : transmittance at wavelength 380nm

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples.

Example 1

Using polyethylene terephthalate having an intrinsic viscosity of 0.65 dl / g without particles as a raw material (PM ₁ ), and polyethylene terephthalate containing 1 wt% of silicon dioxide having an average particle size of 2 μm as a raw material (PM ₂ ), Polyethylene terephthalate containing 5.5 wt%, 3.5 wt% and 1.0 wt% of Clariant's dyes Red GFP, Blue RBL and Yellow GG respectively as a raw material (PM ₃ ) and 10 wt% of an imino ester UV stabilizer Polyethylene terephthalate is used as a raw material (PM ₄ ). After drying the raw materials (PM ₁ ), (PM ₂ ), (PM ₃ ) and (PM ₄ ) in the weight percent ratios shown in [Table 1], the feed block is laminated in two layers and coextruded through a die. The sheet was prepared by extrusion and cooling in a casting drum. The sheet was stretched 3.0 times in the longitudinal direction at a temperature in the range of 75 to 130 ° C., then coated with an inline coater with an aqueous dispersion containing 2.0 wt% of a water-soluble acrylic emulsion, followed by 3.3 at a temperature range of 90 to 145 ° C. in the transverse direction. After extending | stretching and heat-processing in the temperature range of 215-235 degreeC, the film of 25 micrometers of average thickness was obtained. The thickness of each layer (A / B / C) prepared was 2 μm / 22.95 μm / 0.05 μm.

division Floor type Layer thickness (Μm) Content (weight%) Remarks PM1 PM2 PM3 PM4 Example 1 A 2 86 4 0 10 Lamination B 22.95 70 0 20 10 C 0.05 - - - - Example 2 A 2 87 3 0 10 Lamination B 22.95 70 0 20 10 C 0.05 - - - - Example 3 A 4 83 7 0 10 Lamination B 20.95 70 0 20 10 C 0.05 - - - - Example 4 A 4 84 6 0 10 Lamination B 20.95 70 0 20 10 C 0.05 - - - - Comparative Example 1 - 25 72 8 20 0 fault Comparative Example 2 - 25 78 2 20 0 fault

Example 2

Raw materials (PM ₁ ), (PM ₂ ), (PM ₃ ) and (PM ₄ ) were dried at the weight percentage ratios shown in [Table 1], and then in the same manner as in Example 1, having an average thickness of 25 μm. A film was obtained. The thickness of each layer (A / B / C) of the produced film was 2 µm / 22.95 µm / 0.05 µm.

Example 3

Raw materials (PM ₁ ), (PM ₂ ), (PM ₃ ) and (PM ₄ ) were dried at the weight percentage ratios shown in [Table 1], and then in the same manner as in Example 1, having an average thickness of 25 μm. A film was obtained. The thickness of each layer (A / B / C) of the produced film was 4 µm / 20.95 µm / 0.05 µm.

Example 4

Raw materials (PM ₁ ), (PM ₂ ), (PM ₃ ) and (PM ₄ ) were dried at the weight percentage ratios shown in [Table 1], and then in the same manner as in Example 1, having an average thickness of 25 μm. A film was obtained. The thickness of each layer (A / B / C) of the produced film was 4 µm / 20.95 µm / 0.05 µm.

Comparative Example 1

A polyethylene terephthalate having an intrinsic viscosity of 0.65 dl / g without particles is used as a raw material (PM ₁ ), and a polyethylene terephthalate containing 5 wt% of silicon dioxide having an average particle size of 4 μm is used as a raw material (PM ₂ ), A polyethylene terephthalate containing 5.5 wt%, 3.5 wt% and 1.0 wt% of Clariant dyes Red GFP, Blue RBL and Yellow GG, respectively, is used as a raw material (PM ₃ ). The raw materials (PM ₁ ), (PM ₂ ) and (PM ₃ ) were dried at a weight percentage ratio shown in [Table 1], and then extruded into a single layer and cooled in a casting drum to prepare a sheet. The sheet was stretched 3.0 times in the temperature range of 75 to 130 ° C in the longitudinal direction, then stretched 3.3 times in the temperature range of 90 to 145 ° C in the transverse direction and heat-treated in the temperature range of 215 to 235 ° C to give an average thickness of 25 占 퐉. A film was obtained.

Comparative Example 2

The raw materials (PM ₁ ), (PM ₂ ), (PM ₃ ) and (PM ₄ ) were dried at the weight percentage ratios shown in the above [Table 1], and then the average thickness was 25 μm in the same manner as in Comparative Example 1. A film was prepared.

Table 2 and Table 3 below show the results of measurement of the particle amount, turbidity, UV blocking rate, and adhesiveness of the Examples and Comparative Examples.

division Floor type Layer thickness (Μm) Silica content (weight %) Turbidity (%) UV-rays Blocking rate (%) Remarks Example 1 A 2 0.04 0.4 99 Lamination B 22.95 0 C 0.05 - Example 2 A 2 0.03 0.3 99 Lamination B 22.95 0 C 0.05 - Example 3 A 4 0.07 0.6 99 Lamination B 20.95 0 C 0.05 - Example 4 A 4 0.06 0.5 99 Lamination B 20.95 0 C 0.05 - Comparative Example 1 - 25 0.08 4 40 fault Comparative Example 2 - 25 0.02 One 38 fault

division layer Adhesive to Ink bookbinder solvent bookbinder solvent bookbinder solvent bookbinder solvent bookbinder solvent AC EA NC TOL / MEK EVA TOL / IPA / EA VC-VA MEK CAB MEK Example 1 A 1B 1B 1B 1B 1B B - - - - - C 4B 4B 5B 4B 5B Example 2 A 1B 1B 1B 1B 1B B - - - - - C 4B 4B 5B 4B 5B Example 3 A 1B 1B 1B 1B 1B B - - - - - C 4B 4B 5B 4B 5B Example 4 A 1B 1B 1B 1B 1B B - - - - - C 4B 4B 5B 4B 5B Comparative Example 1 - 1B 1B 1B 1B 1B Comparative Example 2 - 1B 1B 1B 1B 1B

In the table above,

AC : acrylic, EA : ethyl acetate, NC : nitrocellulose,

TOL : toluene, MEK : methyl ethyl ketone, EVA : ethylene vinyl acetate,

IPA : Isopropyl Alcohol, VC-VA : Vinyl Chloride-Vinyl Acetate,

CAB : Cellulose Acetate Butyrate

The colored film of the present invention is excellent in turbidity as described above, excellent in UV protection effect when used in automobiles and buildings, and excellent in adhesiveness to prevent the scattering of glass fragments even if the glass is broken by external impact. Will have

Claims (15)

Three-layer structure (A layer / B layer / C layer) such as polyester transparent layer (A layer), polyester color layer (B layer) containing 0.01 to 10% by weight of dye, and coating layer (C layer) to which adhesion was given A window comprising from 0.01 to 5% by weight of an ultraviolet stabilizer in at least one layer Biaxially oriented polyester film for film. The biaxially stretched polyester film for window films according to claim 1, wherein a pressure-sensitive adhesive layer (D layer) is formed on the other side of the transparent layer (A layer). The biaxially stretched polyester film for window film according to claim 1, wherein a deposition layer (E layer) is formed on the other side of the coating layer (C layer). The biaxially stretched polyester film for window films according to claim 3, wherein a pressure-sensitive adhesive layer (D layer) is formed on the other side of the deposition layer (E layer). The biaxially stretched polyester film for window films according to claim 2, wherein a transparent film layer (F layer) is laminated on the outer surface of the adhesive layer (D layer). The biaxially stretched polyester film for window film according to claim 5, wherein a pressure-sensitive adhesive layer (D layer) is formed on an outer surface of the transparent film layer (F layer). The biaxially stretched polyester film for window films according to claim 4, wherein a pressure-sensitive adhesive layer (D layer) and a transparent film layer (F) are laminated on the other side of the transparent layer (A layer). The biaxially stretched polyester film for window films according to claim 1, wherein inorganic particles are contained in at least one of the transparent layer (A layer) and the color layer (B layer). The biaxially stretched polyester film for window film according to claim 8, wherein the content of the inorganic particles is 0.01 to 1% by weight. The biaxially stretched polyester film for window films according to claim 8, wherein the average particle diameter of the inorganic particles is 0.05 to 5 mu m. The biaxially stretched polyester film for window films according to claim 8, wherein the inorganic particles are silica. The thickness of a transparent layer (A layer) is 1-10 micrometers, The biaxially-stretched polyester film for window films of Claim 1 characterized by the above-mentioned. The biaxially stretched polyester film for window films according to claim 1, wherein polyester, acrylic, or polyurethane adhesives are used to impart adhesion to the coating layer (C layer). The biaxially stretched polyester film for window films according to claim 1, wherein the coating layer (C layer) has a thickness of 0.01 to 1 µm. The ultraviolet stabilizer according to claim 1, UV absorbers such as benzophenone series, benzotriazole series, resorcinol monobenzoate series, salicylate series, hydroxy benzoate series, formamidine series, hindered amine ultraviolet stabilizer, Or an imino ester-based UV stabilizer.