JPH08259708A - Polyester film for laminating onto support - Google Patents

Abstract

PURPOSE: To obtain a less colored film which effectively absorbs light beams having wavelengths of 400nm or shorter. CONSTITUTION: This film comprises a layer containing at least one ultraviolet absprber selected from among salicylic acid and derivatives thereof, benzophenone and derivatives thereof, benzotriazole and derivatives thereof, and cyanoacrylates and derivatives thereof and at least one indole compound represented by the formula. In the formula, R<1> is an optionally branched alkyl or aralkyl and R<2> is cyano or -COOR<3> , where R<3> is an alkyl or aralkyl which can have a substituent.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyester film for laminating a support, and more particularly to a polyester film for laminating a support which is laminated on various supports to reduce the influence of ultraviolet rays. It is about.

[0002]

2. Description of the Related Art Ultraviolet rays in the short wavelength region of 400 nm or less in artificial rays such as sun rays, fluorescent lamps and cathode ray tubes have an effect on the human body such as sunburn, stains, carcinogenesis and visual acuity, and decrease in mechanical strength of articles. , Deterioration of appearance such as fading, deterioration of food, deterioration of color tone of printed matter, and the like. Insects exhibit phototaxis at a specific wavelength in the visible light or ultraviolet region (for example, Eiko Tateda et al. “Insects from the viewpoint of behavior 2. Neurobiology of insects”, Baifukan, April 1979, No. 68). ~
Page 69). In particular, many insects are strongly attracted to ultraviolet rays, and various problems occur in artificial lighting such as fluorescent lamps, which have spectral characteristics in the ultraviolet region.

[0003] For example, sunlight from windows of buildings and automobiles causes fading of internal fabrics and the like, and sunburn occurs in the human body. Therefore, it is required to suppress transmission of ultraviolet rays through the windows. In addition, for safety, heat ray reflection / absorption, and visibility control, polyester film is laminated on windows of buildings and automobiles, but the polyester film itself or the adhesive for lamination is deteriorated by ultraviolet rays. , There is a problem with the warranty period as a window pasted film product.

Fluorescent lamps are widely used as lighting fixtures, but in the display and sale of products, the ultraviolet rays of the fluorescent lights installed discolor the articles and deteriorate the food. Insects also have a phototaxis to visible light, but since they show a strong phototaxis particularly to wavelengths in the ultraviolet region of 330 to 400 nm, they fly by detecting the ultraviolet rays emitted by fluorescent lamps, and they come into contact with articles and foods. Mix into. In addition, many insects fly to street lights, show windows, and windows, causing discomfort.

In order to suppress the deterioration of articles and foods and the flying of insects due to ultraviolet rays, 400 nm emitted from a fluorescent lamp is used.
It is necessary to block the ultraviolet rays of the following wavelengths. As a method of blocking a specific light wavelength of a fluorescent lamp, Japanese Patent Laid-Open No. 61-13
As disclosed in Japanese Patent No. 8664, a method of coating a fluorescent lamp with a polymer containing an ultraviolet absorber, JP-B-63-43
As disclosed in Japanese Patent No. 738, a fluorescent lamp tube is coated with a heat-shrinkable polymer film containing a specific pigment to produce a film having a thickness of 500 n.
Method for blocking light of short wavelength of m or less, JP-A-63-13
As can be seen in Japanese Patent No. 3933, a polymer material containing a light-shielding agent in which an ultraviolet absorber and a dye are used in combination,
A pest-attracting blocking material that selectively absorbs light having a wavelength of 500 nm has been proposed.

Further, for the purpose of blocking a specific wavelength, a fluorescent lamp tube having an outer surface coated with a coating or a fluorescent lamp tube coated with a polymer film for safety against damage is actually used, and it is also used as a window sticking film. Insect attraction films are on the market, but more effective means are needed.

Recently, a method for easily forming a color image by an ink jet method or a thermal transfer method is becoming popular. Applications of this method include marking sheets used indoors and outdoors, advertising posters, and displays. However,
The dyes used in these inks have problems with UV resistance, and with sublimation dyes, there is volatilization due to sublimation after printing, albeit little by little, and there is also a problem with scratch resistance of these printing layers. There is. In particular, marking sheets used outdoors were once designed by the cutting and pasting method, but recently, with the combination of computer graphics and the above printing methods, it becomes possible to easily form photographic-like images, Although it is being used more widely in indoor and outdoor advertisements and various displays, the need to solve the above-mentioned problem of ink dyes is increasing, and as one of the solutions, a protective film that effectively blocks ultraviolet rays after image formation is required. Has been.

So-called vinyl chloride steel sheets obtained by coloring a polyvinyl chloride film or laminating a steel sheet on which a printing layer is provided are widely used for building materials and electric appliances.
To improve the appearance, a polyester film is laminated thereon, or to improve scratch resistance, a polyester film having a scratch resistant layer is laminated. Further, the polyester film may be directly laminated on the steel sheet without using the polyvinyl chloride layer. Also in these, not only the UV resistance of the polyester film itself, but also the UV resistance of the adhesive between the steel sheet and the polyester film, the UV resistance of the printing layer and the coloring layer becomes a problem, and the polyester film functions as a protective layer. Is required.

With the spread of computers and personal computers,
VDT (Visual Display Termin
a) Visibility of screen, chargeability, dirtiness, ultraviolet rays, etc. become problems, and as a countermeasure, various VDT filters using plastic or glass as a support are sold,
There is a demand for a laminated film that effectively blocks ultraviolet rays without causing a visual problem due to unnecessary coloring.

As a method of maintaining the transparency of the polyester film and suppressing the transmission of ultraviolet rays, a method of incorporating an ultraviolet absorber into the polyester film, or a method of coating, laminating, coextrusion or the like containing the ultraviolet absorber is used. The method of laminating the layers is generally practiced.

However, the effective absorption wavelength region of known salicylic acid-based, benzophenone-based, benzotriazole-based, cyanoacrylate-based ultraviolet absorbers is 270 to 380 nm, depending on the compound, and 380 nm.
There is a need for compounds that effectively absorb wavelengths up to 400 nm. In order to effectively absorb the wavelength of 380 to 400 nm, dyes and pigments are used in combination with the ultraviolet absorber, but this dye or pigment causes coloration due to absorption of wavelengths in the visible light region, and is effective in preventing insects from flying. Even
There is a problem in that the appearance of articles and foods due to colored light is inferior and the working environment is poor.

[0012]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a film with little coloring that effectively absorbs light in a short wavelength region of 400 nm or less. .

[0013]

DISCLOSURE OF THE INVENTION The inventors of the present invention have made earnest studies in order to achieve the above-mentioned object, and as a result, disclosed in Japanese Patent Laid-Open No. 4-134.
Focusing on the fact that a short wavelength in the region of 400 nm or less can be absorbed by the combined use of the specific indole compound shown in 065 and a known ultraviolet absorber, the present invention is applied to a polyester film to provide the present invention. It came to completion.

That is, the gist of the present invention is to use at least one ultraviolet absorber selected from salicylic acid type ultraviolet absorbers, benzophenone type ultraviolet absorbers, benzotriazole type ultraviolet absorbers, and cyanoacrylate type ultraviolet absorbers, and the following general A polyester film for laminating a support, comprising a layer containing at least one kind of indole compound represented by the formula (1).

[0015]

Embedded image

In the general formula (1), R ¹ represents an optionally branched alkyl group or aralkyl group, and R ² represents a cyano group or —COOR ³ . However, R ³ represents an alkyl group which may have a substituent or an aralkyl group.

The present invention will be described in detail below. The polyester in the present invention refers to polyethylene terephthalate, polyethylene naphthalate, or polyester composed of cyclohexanedimethanol and an aliphatic and / or aromatic carboxylic acid. However, the polyester in the present invention is not limited to the above polyester, and a copolymer containing the above components as a main component is appropriately selected depending on the type of the support to which the polyester film for supporting a support of the present invention is applied. To be done.

For example, when the support is a fluorescent lamp tube, it may be preferable to use a copolyester which is excellent in workability for adhesion to the fluorescent lamp tube due to heat shrinkability. Also,
In the case where the support is a steel plate, a film that easily stretches may be used depending on the film forming conditions in order to follow the forming process of the steel plate, but it may be preferable to use a copolyester.

The polyester film used as the substrate in the present invention is a film obtained by stretching in at least one axial direction mainly by the T-die method, but preferably a film obtained by stretching in a biaxial direction successively or simultaneously. And a film dimensionally stabilized by so-called heat setting is particularly preferable. Further, in some cases, it may be a stretched film obtained by an inflation method.

The above-mentioned base polyester film may be a single-layer film, or may be a multi-layer film in which functional layers such as slipperiness and thermal adhesiveness are laminated by a coextrusion method, so-called in-line coating method. (Coating and stretching method)
Therefore, a multi-layer film in which functional layers such as adhesiveness, slipperiness and antistatic property are laminated may be used.

In general use, a polyester film having thermal dimensional stability is suitable, but when the support is a fluorescent lamp tube, it is heat-shrinked so as to be adhered to the fluorescent lamp tube by thermal contraction after coating. A suitable polyester film is preferred. As an example of the heat-shrinkable polyester film, there is one produced by the T-die method proposed by Japanese Patent Application No. 5-113137, but a fluorescent lamp tube is inserted into a film formed into a tube shape to form a hot-air stove. Since the method of passing and coating is suitable for industrial production, JP-A-49-
A film produced by a method such as 68652 publication is also suitable.

The thickness of the above-mentioned base polyester film is selected according to the application, but is preferably 5 to 500.
μm. In addition, the base polyester film, if necessary, inorganic particles, organic particles, as a slipperiness improving agent,
It may contain an organic lubricant, an antistatic agent, a stabilizer, a coloring agent, a light shielding agent, or the like.

The indole compound in the present invention is a compound represented by the following general formula (1).

[0024]

Embedded image

In the general formula (1), R ¹ represents an optionally branched alkyl group or aralkyl group, and R ² represents a cyano group or —COOR ³ . However, R ³ represents an alkyl group which may have a substituent or an aralkyl group. Specific examples of R ¹ include a methyl group, an ethyl group, a butyl group,
Examples thereof include an octyl group, a benzyl group and a 2-ethylhexyl group, and R ³ is specifically an alkyl group such as a methyl group, an ethyl group, an isopropyl group or a butyl group, a hydroxyethyl group, a cyanoethyl group or a chloroethyl group. Examples thereof include, but are not limited to, substituted alkyl groups such as ethoxypropyl group, and benzyl group. The indole compound represented by the general formula (1) is 380 n
It is characterized in that it can effectively absorb ultraviolet rays in the region of m to 400 nm.

The salicylic acid type ultraviolet absorber, the benzophenone type ultraviolet absorber, the benzotriazole type ultraviolet absorber and the cyanoacrylate type ultraviolet absorber in the present invention are characterized in that they absorb the ultraviolet ray in the range of 300 nm to 380 nm. When used in combination with an indole compound, it is possible to effectively absorb ultraviolet rays of 300 nm to 400 nm. As each of the above ultraviolet absorbers,
For example, “12394 chemical products”, Chemical Industry Daily,
The following compounds described on pages 955 to 958, issued in January 1994, are mentioned.

Examples of the salicylic acid-based ultraviolet absorber include phenyl salicylate, p-tert-butylphenyl salicylate, p-octylphenyl salicylate, and the like, and examples of the benzotriazole ultraviolet absorber include 2- (2 ′). -Hydroxy-5'-methylphenyl) benzotriazole, 2- (2'-hydroxy-5'-tert-butylphenyl) benzotriazole, 2- (2'-hydroxy-3 ', 5'-di-te
rt-Butylphenyl) benzotriazole, 2-
(2'-hydroxy-3'-tert-butyl-5'-
Methylphenyl) -5-chlorobenzotriazole, 2
-(2'-hydroxy-3 ', 5'-di-tert-butylphenyl) -5-chlorobenzotriazole, 2-
(2'-hydroxy-3 ', 5'-di-tert-amylphenyl) benzotriazole, 2- (2'-hydroxy-4'-octoxyphenyl) benzotriazole, 2- (2'-hydroxy-3' -(3 ", 4",
5 ", 6" -tetrahydrophthalimidomethyl) -5 '
-Methylphenyl) benzotriazole, 2,2-methylenebis [4- (1,1,3,3-tetramethylbutyl) -6- (2H-benzotriazol-2-yl) phenol] and the like, and benzophenone-based Examples of the ultraviolet absorber include 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone and 2
-Hydroxy-4-octoxybenzophenone, 2-hydroxy-4-dodecyloxybenzophenone, 2,
2'-dihydroxy-4-methoxybenzophenone,
2,2'-dihydroxy-4,4'-dimethoxybenzophenone, 2-hydroxy-4-methoxy-5-sulfobenzophenone, bis (2-methoxy-4-hydroxy-5-benzoylphenyl) methane and the like, and cyano Examples of the acrylate-based ultraviolet absorber include 2-
Examples thereof include ethylhexyl-2-cyano-3,3'-diphenyl acrylate and ethyl-2-cyano-3,3'-diphenyl acrylate.

In order to prevent the deterioration of the layer containing the indole compound and the ultraviolet absorber, the hindered amine light stabilizer, the antioxidant and the nickel metal complex may be used in combination therewith.

The layer containing the indole compound and the ultraviolet absorber (ultraviolet absorbing layer) in the present invention is a layer in which the above compound is uniformly dispersed in a polymer compound as a binder, and a coextrusion method, It is formed on a polyester film substrate by an extrusion coating method, a coating method, a laminating method or the like. As the polymer compound as the binder, polyester, polyurethane, polyacrylate and the like and a mixture of these and a cross-linking agent can be used, but the binder is not limited thereto.

When the ultraviolet absorbing layer is formed by the coextrusion method or the extrusion coating method, polyester is preferable as the binder from the viewpoint of adhesion to the base polyester film. In this case, it may be preferable to use a copolyester having a low melting point in consideration of the thermal stability of the indole compound or the ultraviolet absorber during melt extrusion.

When the ultraviolet absorbing layer is formed by the coating method, a solvent solution of a solvent-soluble polymer compound is used as the binder from the viewpoint of the solubility of the indole compound and the ultraviolet absorber and the uniform presence in the coating layer. Preference is given to using. However, a method in which an indole compound or an ultraviolet absorber is dispersed in an aqueous medium and the aqueous dispersion is further dispersed in a solution or dispersion of an aqueous polymer compound is also applicable.

In the laminating method, a polymer film containing an indole compound and an ultraviolet absorber in advance or a polymer film having a layer containing an indole compound and an ultraviolet absorber is preliminarily provided with a polyester film through an adhesive or a heat-adhesive layer. It is a method of laminating on a substrate.

The thickness of the ultraviolet absorbing layer in the present invention and the contents of the indole compound and the ultraviolet absorbent contained therein are appropriately selected depending on the application. However, when the incident light intensity of a light beam of a single wavelength region of 400 nm or less irradiated from a light source on the polyester film having an ultraviolet absorbing layer is I ₀ and the transmitted light intensity after passing through the polyester film is I, the above layer thickness is The content and content are
It is preferable to select I / I ₀ ≦ 0.3, preferably I / I ₀ ≦ 0.2. In other words, it is preferable to select log ₁₀ I ₀ / I defined as the absorbance of the film to be 0.53 or more, preferably 0.70 or more.

In the polyester film for laminating a support of the present invention, antistatic property, scratch resistance, tackiness, heat-sealing property, adhesive property, printing property can be selected by selecting the kind of the polymer compound as the binder and the binder composition. It is also possible to impart a function such as toughness, matteness, slipperiness, infrared absorption, coloring appearance, and suitability for secondary processing.

Examples of the support to which the polyester film for laminating a support of the present invention is applied include, but are not limited to, organic or inorganic glass, fluorescent lamp tubes, steel plates, printed matter, VDT filters and the like. Next (1) ~
(5) is an example of the effects obtained when various supports to which the polyester film for supporting substrate lamination of the present invention is applied and the polyester film for supporting substrate lamination of the present invention are applied.

(1) When an inorganic or organic glass in a house, an automobile or a vehicle is used as a support, not only the ultraviolet deterioration of the polyester film itself but also the color burn of indoor articles and the sunburn of the human body are reduced, and flying insects are used. Control of the arrival of
It has the effect of preventing scattering of broken glass.

(2) When the fluorescent lamp tube is used as a support, it is effective in preventing the deterioration of the color tone of the exhibits, improving the safety of damage to the fluorescent lamp tube, and suppressing the flight of flying insects.

(3) In the case of using a steel plate as a support, in addition to the original improvement of appearance, deterioration prevention of the laminate, printing layer,
It has the effect of maintaining the sharpness of the colored layer.

(4) In the case of using as a support a printed matter obtained by ink jetting, thermal transfer, electrostatic copying or ordinary printing method on paper, plastic film sheet or other materials,
Deterioration of the color printing layer due to artificial light such as sunlight and fluorescent lamps is suppressed, long-term storage materials and indoor and outdoor advertisements, signs,
Available for exhibition.

(5) When a VDT filter or CRT full glass is used as a support, it is effective not only for suppressing visual impairment but also for safety of CRT damage.

[0041]

EXAMPLES The present invention will be described below with reference to examples.
The present invention is not limited by the following examples as long as the gist of the present invention is not exceeded. In the following, "parts by weight" means a value converted into solid content, and "PET film" means a biaxially stretched polyethylene terephthalate film. The visible / ultraviolet absorption spectrum of the film is
Spectrophotometer "UVIDEC-67" manufactured by JASCO Corporation
It is the result measured by "0" (product name).

Comparative Examples 1 to 3 A self-crosslinking acrylic resin ("DIANAL SE5377" (trade name) manufactured by Mitsubishi Rayon Co., Ltd.) was diluted with a methyl ethyl ketone solvent to obtain a coating solution having a solid content concentration of 14.8% by weight. Prepared. A 50 μm-thick PET film having an in-line easy-adhesion layer formed on one side (“Diafoil T100E (product name)” manufactured by DIAFOIL Hoechst Co., Ltd.) was coated with the above coating solution using a # 16 bar coater. It was applied and dried at 80 ° C. for 1 minute to form a coating layer having a thickness of 3.5 μm (Comparative Example 1).

90 parts by weight of a self-crosslinking acrylic resin ("Dianal SE5377") and 2,2 ', 4,4'-
10 parts by weight of tetrahydroxybenzophenone (UV absorber "Uvinul D50" (trade name) manufactured by BASF Japan Ltd.) was diluted with a methyl ethyl ketone solvent to prepare a coating solution having a solid content concentration of 14.8% by weight. This coating solution was coated on the easy-adhesion layer of PET film (“Dia foil T100E”) in the same manner as above, and dried at 80 ° C. for 1 minute to form a coating layer having a thickness of 3.5 μm (Comparative Example 2). .

90 parts by weight of a self-crosslinking acrylic resin (“Dianal SE5377”), 10 parts by weight of an indole compound (“BONASORB VA3901” (trade name) manufactured by Orient Chemical Industry Co., Ltd.) and a methyl ethyl ketone solvent Diluted to a solid content of 14.8
A coating solution of weight% was prepared. This coating solution was coated on the easy-adhesion layer of PET film (“Dia foil T100E”) in the same manner as above, dried at 80 ° C. for 1 minute, and the thickness was 3.5 μm.
m coating layer was formed (Comparative Example 3).

Visible of each film of Comparative Examples 1 to 3
The ultraviolet absorption spectra are shown in FIGS. 1, 2 and 3, respectively. In addition, 328 nm, 400 nm, 50 of each film
The light transmittance at 0 nm is shown in Table 1.

[0046]

[Table 1] Binder: Self-crosslinking acrylic resin (“Dianal SE5377”) UV absorber: Benzophenone ultraviolet absorber (“Uvinul D50”) Indole compound: “BONASORB VA3901”

As is clear from the results in Table 1, the film having a coating layer containing the ultraviolet absorber (benzophenone compound) (Comparative Example 2) has a high light transmittance at a wavelength of 400 nm, and therefore the ultraviolet absorption is high. The coating layer containing only the agent does not effectively absorb the ultraviolet light in this region. Further, the film having a coating layer containing an indole compound (Comparative Example 3) has a coating thickness of 328, although it is thick.
The light transmittance at the wavelength of nm is relatively high, and therefore the coating layer containing only the indole compound does not effectively absorb the ultraviolet rays in this region.

Reference Example 1 This reference example is an example conducted to clarify the relationship between the light transmittance and the amount of the coating agent. That is, 90 parts by weight of a self-crosslinking acrylic resin (“Dianal SE5377”), an indole compound (Orient Chemical Industry Co., Ltd.)
Manufactured "BONASORB VA3901"
(Trade name) and 10 parts by weight were diluted with a methyl ethyl ketone solvent to prepare a coating solution having a solid content concentration of 14.8% by weight. Using various bar coaters, the coating thickness after drying is 0.6 μm, 0.8 μm, 1.2 μm, 1.5 μm,
The above coating solution is added to P so that the thickness becomes 2.0 μm and 3.5 μm.
ET film ("Dia foil T100E (product name)")
Was coated on each of the easy-adhesion layers, and dried at 80 ° C. for 1 minute. The visible / ultraviolet absorption spectra of each of these films are shown in FIG. As is clear from FIG. 4, the coating thickness and the amount of the indole compound in the coating layer can be selected according to the ultraviolet absorption required in the 400 nm region.

Examples 1 to 3 Self-crosslinking acrylic resin (“Dianal SE537
7 ”), a benzophenone-based ultraviolet absorber (“ Uvinu
l D50 ”), indole compound (“ BONASO
RB (Bonasorb) VA3901 ") was used at each ratio shown in Table 2 and diluted with a methyl ethyl ketone solvent to prepare each coating solution having a solid content concentration of 14.8% by weight. PET with an in-line easy-adhesion layer formed on one side and a thickness of 50 μm
The above coating solution was applied to the easy-adhesion layer of the film (“Dia foil T100E (product name)”) with a # 16 bar coater and dried at 80 ° C. for 1 minute to form a coating layer having a thickness of 3.5 μm. Thus, the film for laminating the support of the present invention was obtained.The visible / ultraviolet absorption spectra of the above-mentioned films are shown in Fig. 5, Fig. 6 and Fig. 7. Further, 328 of each film is shown.
The light transmittances of nm, 400 nm and 500 nm are shown in Table 2.

[0050]

[Table 2] Binder: Self-crosslinking acrylic resin (“Dianal SE5377”) UV absorber: Benzophenone ultraviolet absorber (“Uvinul D50”) Indole compound: “BONASORB VA3901”

Next, as a pressure-sensitive adhesive, a solvent type acrylic resin (“Olivine BPS5296” manufactured by Toyo Ink Co., Ltd.)
(Brand name)) 100 parts by weight, its curing agent "BHS851
5 "(trade name, manufactured by Toyo Ink Co., Ltd.) 3 parts by weight, benzophenone-based ultraviolet absorber: 2,2'-dihydroxy-4
-Methoxy-benzophenone ("Cyasorb UV-24" (trade name) manufactured by Nippon Cyanamid Co., Ltd.)
An adhesive composition was prepared by blending 1 part by weight.

Then, the above-mentioned pressure-sensitive adhesive composition was applied in a thickness of 20 μm on the coating layer surface of the film to form a pressure-sensitive adhesive layer. Further, as a protective peeling layer for the pressure-sensitive adhesive layer, a PET film having a thickness of 38 μm and having a silicone layer as a release layer (release film “MRG” manufactured by DIAFOIL HOEXT)
(Product name)) was pasted together.

When the release film was peeled off and each support laminating film was attached to the inner surface of the window of the building, the effect of preventing fading of articles such as curtains was observed, and insect flight was suppressed in the summer. Was given.

Example 4 In Example 2, as the base polyester film,
PET film with a thickness of 25 μm (“Dia foil T10
A support lamination film was prepared in the same manner as in Example 2 except that "0E" (trade name) was used. Then, in the same manner as in Example 2, a pressure-sensitive adhesive layer was formed on the coating layer surface of the film, and the release film "MRG" (trade name) was attached thereon. When the release film was peeled off and the support laminating film was attached to the inner surface of the window of the automobile, it was effective in preventing the sunburn of the human body and the fading of the sheet.

Example 5 40 parts by weight of an organic solvent type polyester resin (“ER2001” (trade name) manufactured by Mitsubishi Rayon Co., Ltd.) and polyisocyanate (“Coronate L” manufactured by Nippon Polyurethane Co., Ltd.)
(Trade name)) and 1 part by weight to prepare a heat seal composition. This composition was applied to the ultraviolet absorbing layer of the support laminating film of Example 3 to a thickness of 5 μm to form a heat seal layer. When a support laminating film was laminated by a heat seal method on the printing layer surface of a large-sized synthetic paper printed with an ink jet, there was little deterioration of the color printing layer outdoors, and it was effective for sustaining the display effect.

Example 6 An ultraviolet absorbing layer having the same composition as in Example 2 was provided on one side of a PET film having a thickness of 50 μm and provided with an easy-adhesion layer on both sides by an in-line coating method to obtain a support laminating film. Then, a thickness of 2 on the surface where the ultraviolet absorbing layer is not formed.
A scratch-resistant layer of UV curable acrylic resin having a thickness of μm was formed. Further, a heat seal layer similar to that in Example 5 was formed on the ultraviolet absorbing layer. When a support laminating film was laminated on the vinyl chloride resin layer of the vinyl chloride steel sheet by a heat sealing method, a good appearance was maintained without deterioration of the printed layer of the vinyl chloride layer.

Example 7 Polyurethane (Takelac A-manufactured by Takeda Pharmaceutical Co., Ltd.)
310 "(trade name)) and its curing agent" Takenate A-3 "(trade name) in a solid content weight ratio of 12/1 92.3 parts by weight, benzophenone-based ultraviolet absorber: 2-Hydroxy-4-octoxybenzophenone ("Chemisorb" (trade name) manufactured by Chemipro Kasei Co., Ltd.)
6.5 parts by weight of an indole compound (“BONASORB UA-3” manufactured by Orient Chemical Industry Co., Ltd.)
901 "(trade name) 1.3 parts by weight to prepare an ultraviolet absorbent composition.

A PET film having a thickness of 12 μm (“DIAFOIL H100” (trade name) manufactured by DIAFOIL HEX Co., Ltd.) was coated with the above-mentioned ultraviolet absorbent composition to a thickness of 4.8.
The coating layer was formed by coating with a thickness of μm to obtain a support laminating film. The same P as above is applied to the UV absorbing layer of this film.
ET film (“Dia foil H100”) was laminated by a heat sealing method to prepare a film having an ultraviolet absorbing layer in the center with the PET film on both sides. The light transmittance of this film was 0% at 328 nm, 11.1% at 400 nm, and 83.3% at 550 nm.

A heat-sealing composition similar to that of Example 5 was applied on one surface of the above film to a thickness of 5 μm to form a heat-sealing layer. When a support laminating film was laminated by a heat seal method on the printing layer surface of a large-sized synthetic paper printed with an ink jet, there was little deterioration of the color printing layer outdoors, and it was effective for sustaining the display effect.

[0060]

According to the present invention described above, a polyester film for laminating a support is provided which is a film with little coloration which effectively absorbs light in the short wavelength region of 400 nm or less. The polyester film for lamination is used by laminating it on various supports, and can solve various problems caused by ultraviolet rays.

[Brief description of drawings]

1 shows a visible / ultraviolet absorption spectrum of the film of Comparative Example 1. FIG.

FIG. 2 shows a visible / ultraviolet absorption spectrum of the film of Comparative Example 2.

FIG. 3 shows a visible / ultraviolet absorption spectrum of the film of Comparative Example 3.

FIG. 4 shows visible / ultraviolet absorption spectra of the film of Reference Example 1 prepared to clarify the relationship between light transmittance and the amount of coating agent.

5 shows a visible / ultraviolet absorption spectrum of the film of Example 1. FIG.

6 shows a visible / ultraviolet absorption spectrum of the film of Example 2. FIG.

7 shows a visible / ultraviolet absorption spectrum of the film of Example 3. FIG.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location C09K 3/00 104 C09K 3/00 104F // C07D 209/22 C07D 209/22 209/24 209 / twenty four

Claims (1)

[Claims] 1. At least one UV absorber selected from salicylic acid-based UV absorbers, benzophenone-based UV absorbers, benzotriazole-based UV absorbers, and cyanoacrylate-based UV absorbers, and the following general formula (1): A polyester film for laminating a support, comprising a layer containing at least one kind of indole compound described above. Embedded image (In the general formula (1), R ¹ is an optionally branched alkyl group or aralkyl group, and R ² is a cyano group or —COO.
Shows the R ^3. However, R ³ represents an alkyl group which may have a substituent or an aralkyl group. )