JP2003025479A - Hard coating film having photocatalytic function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hard coating film which has a photocatalytic function layer via an inorganic hard coating layer having excellent scuff resistance and weather resistance and suppressing occurrence of a curl on a base and which has a photocatalytic function suitable as outer surface laminating or the like of a window glass of particularly a multi-story building. SOLUTION: The hard coating film having the photocatalytic function comprises a primer layer and a hard coating layer made of metal oxide particles, a cured material of a silane compound and the photocatalytic function layer containing a titanium dioxide and a silica, sequentially laminated on one surface of a specific base.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a hard coat film having a photocatalytic function. More specifically, the present invention has a photocatalytic function, is excellent in scratch resistance and weather resistance, has less occurrence of cracks, especially for external surface attachment for self-cleaning of window glass of high-rise buildings and plastic boards for windows, Alternatively, the present invention relates to a hard coat film having a photocatalytic function suitable for attaching a show window.

[0002]

2. Description of the Related Art Conventionally, for various purposes, as a window glass or a film for sticking a plastic board for windows (hereinafter, also referred to as a window film), various functions such as an ultraviolet ray shielding function, an infrared ray shielding function, A plastic film having one or more of an internal visual-proof function, an antifouling function, a fragment scattering prevention function, etc. is used. Further, in recent years, since it has been found that semiconductors such as titanium dioxide have a strong photocatalytic action, research and development of photocatalysts have been actively conducted. In this photocatalyst, when a semiconductor typified by, for example, titanium dioxide is excited with light having an energy higher than its band gap, electrons are generated in the conduction band and holes are generated in the valence band. Utilizing hole pairs,
By applying such photocatalytic action, for example, the decomposition / decomposition of various substances that pose a problem on environmental pollution in wastewater or waste gas
Removal, deodorization, antifouling, antibacterial and sterilization are being studied.

Further, as described above, in such a photocatalyst, when light having an energy larger than the band gap is irradiated, electrons are generated in the conductor of the photocatalyst and holes are generated in the valence band. It is known that the surface is given a polarity and becomes superhydrophilic by the action of holes and / or holes.
Therefore, it has been attempted to provide a photocatalytic functional layer on the surface of a window film by utilizing the superhydrophilicity and antifouling property of such a photocatalyst and to attach this film to the front surface of a glass window or the like. This attempt is to clean naturally by using its superhydrophilicity and antifouling property without cleaning the dirt (organic matter) adhering to the film surface by repeating irradiation of sunlight and rainfall. ) Together with the aim of securing anti-fog of the window glass and the visibility of rainy weather.

In such a window film, a hard coat layer is usually provided for the purpose of imparting scratch resistance and the like. This hard coat layer is roughly classified into an organic type and an inorganic type. As the organic type hard coat layer, for example, an ionizing radiation curable resin composition such as a polyester acrylate type, an epoxy acrylate type, a urethane acrylate type and a polyol acrylate type is applied. A layer formed by curing is known. On the other hand, as the inorganic hard coat layer, a metal oxide layer formed by a sol-gel method, for example, a silicon oxide polymer layer having a siloxane bond is known. In such a hard coat layer, when a photocatalytic functional layer is provided on the surface of the hard coat layer, the inorganic hard coat layer is advantageous because the hard coat layer is rapidly deteriorated by the photocatalytic action in the organic hard coat layer. Is. However, although the inorganic hard coat layer has excellent scratch resistance, the sol-
When a layer made of a metal oxide is formed by the gel method, there are problems that shrinkage occurs during curing and curling is unavoidable, weather resistance is insufficient, and cracks tend to occur over time.

[0005]

SUMMARY OF THE INVENTION Under such circumstances, the present invention provides a photocatalyst via an inorganic hard coat layer which is excellent in scratch resistance and weather resistance on the substrate and in which curling is suppressed. An object of the present invention is to provide a hard coat film having a functional layer and having a photocatalytic function which is suitable for sticking on the outer surface for self-cleaning of window glass of high-rise buildings and plastic boards for windows, or for sticking show windows. It is what

[0006]

As a result of intensive studies to achieve the above object, the present inventors have found that the hard coat layer has a specific constitution and the hard coat layer cures the metal oxide particles and the silane compound. It has been found that a hard coat film consisting of the body can meet the purpose. The present invention has been completed based on such findings. That is, the present invention provides (1) a primer layer on one surface of a base material made of polyethylene terephthalate, vinyl chloride resin or acrylic resin, a hard coat layer made of metal oxide particles and a cured product of a silane compound, and A hard coat film having a photocatalytic function, which is obtained by sequentially laminating a photocatalytic functional layer containing titanium dioxide and silica, and (2) the photocatalyst of (1), wherein an adhesive layer is provided on the other surface of the base material. A hard coat film having a function is provided.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION In the hard coat film having a photocatalytic function of the present invention, a hard coat layer is provided on one surface of a substrate via a primer layer, and a photocatalytic functional layer is further provided thereon. It has a structure. In the present invention, polyethylene terephthalate as the substrate,
It is used by appropriately selecting it from a base material made of a vinyl chloride resin or an acrylic resin according to the situation.

The thickness of this substrate is not particularly limited,
It can be appropriately selected from the range of usually 5 to 500 μm, preferably 10 to 300 μm, and more preferably 10 to 200 μm according to the purpose of use. The substrate used in the present invention is preferably transparent, but may be colored or vapor-deposited, and may contain an ultraviolet absorber. Further, for the purpose of improving the adhesiveness with the layer provided on the surface, one surface or both surfaces can be subjected to a surface treatment by an oxidation method or a roughening method, if desired. Examples of the oxidization method include corona discharge treatment, chromic acid treatment (wet), flame treatment, hot air treatment, ozone / ultraviolet irradiation treatment, and the like, and as the roughening method, for example, sandblast method, solvent treatment method, etc. Is mentioned. These surface treatment methods are appropriately selected according to the type of the base material, but in general, the corona discharge treatment method is preferably used from the viewpoints of effect and operability.

In the present invention, the primer layer provided on one surface of the base material may be one having good adhesion to the hard coat layer provided thereon and adhesion to the base material, and particularly Without limitation, a conventionally known primer such as acrylic type, polyester type,
Polyurethane-based, silicone-based, or rubber-based primers can be used, but acrylic and polyester-based primers are preferable from the viewpoint of durability and adhesion. This primer may contain an ultraviolet absorber or a light stabilizer, if necessary. The thickness of this primer layer is, in terms of uniform coating properties and adhesion,
The range of 0.1 to 40 μm is preferable, and 0.5 to 20 is particularly preferable.
The range of μm is preferred. If the thickness is less than 0.1 μm, the adhesion may be insufficient, while if it exceeds 40 μm, the flexibility of the hard coat film may be impaired. When an ultraviolet absorber or a light stabilizer is contained, it is usually 0.0 per 100 parts by weight of the primer.
It may be contained in an amount of 1 to 10 parts by weight, preferably 0.1 to 5 parts by weight. The primer layer is formed on the substrate by a conventionally known method, for example, a bar coating method, a knife coating method, a roll coating method, a blade coating method, a die coating method, a gravure coating method or a curtain coating method. It can be carried out by drying treatment.

In the present invention, a hard coat layer is provided on the primer layer thus formed. The hard coat layer is a layer composed of metal oxide particles and a cured product of a silane compound. Here, as the metal oxide particles, for example, Si, Ge, Sn, Al, In, Ga, Z
n, Ti, Zr, Sc, Y, lanthanoid metal (Ce
Particles) such as metal oxides, complex oxides, or metal-doped metal oxides. These metal oxide particles may be used alone or in combination of two or more. The average particle size of the metal oxide particles is preferably 1 to 10000 nm, more preferably 10 to 500 nm, and further preferably 20 to 20 from the viewpoints of curl prevention properties and hard coat performance.
It is in the range of 0 nm. On the other hand, examples of the silane compound include an alkoxysilane compound and a chlorosilane compound. The alkoxysilane compound is not particularly limited as long as it is a silicon compound having a hydrolyzable alkoxyl group, and examples thereof include general formula (I) R ¹ _n Si (OR ² ) _4-n ... (I) [wherein , R ¹ is a hydrogen atom or a non-hydrolyzable group, specifically, an alkyl group, a substituted alkyl group (substituent: halogen atom, epoxy group, (meth) acryloyloxy group, etc.), alkenyl group, aryl group or aralkyl group. And R ² represents a lower alkyl group. n is an integer of 0 to 2, and when there are a plurality of R ^{1 s} and OR ^{2 s} , a plurality of R ^{1 s} may be the same or different, and a plurality of OR ^{2 s.}
May be the same or different. ] The compound represented by these can be mentioned.

Examples of the alkoxysilane compound represented by the general formula (I) are tetramethoxysilane, tetraethoxysilane, tetra-n-propoxysilane, tetraisopropoxysilane, tetra-n-butoxysilane and tetraisosilane. Butoxysilane, tetra-sec-butoxysilane, tetra-tert-butoxysilane, trimethoxysilane hydride, triethoxysilane hydride, tripropoxysilane hydride, methyltrimethoxysilane, methyltriethoxysilane, methyltripropoxysilane, methyltriisosilane. Propoxysilane, ethyltrimethoxysilane, ethyltriethoxysilane, propyltriethoxysilane, butyltrimethoxysilane, phenyltrimethoxysilane, phenyltriethoxysilane, γ-glycy Xypropyltrimethoxysilane, γ-acryloyloxypropyltrimethoxysilane, γ-methacryloyloxypropyltrimethoxysilane, dimethyldimethoxysilane, methylphenyldimethoxysilane, vinyltrimethoxysilane, vinyltriethoxysilane, divinyldimethoxysilane, divinyldiethoxy Examples include silane. These may be used alone or in combination of two or more.

In this case, the alkoxysilanes are n
Is 0, or n is 1 to 2 and R ¹ is a hydrogen atom, a completely hydrolyzed compound gives an inorganic silica-based cured product,
When partially hydrolyzed, a polyorganosiloxane-based cured product or a mixed-system cured product of an inorganic silica-based and a polyorganosiloxane-based is obtained. On the other hand, a compound in which n is 1 to 2 and R ¹ is a non-hydrolyzable group has a non-hydrolyzable group, and therefore a polyorganosiloxane-based cured product is obtained by partial or complete hydrolysis. Examples of the chlorosilane compound include ethyldichlorosilane, ethyltrichlorosilane, dimethyldichlorosilane, trichlorosilane, trimethylchlorosilane, dimethyldichlorosilane, and methyltrichlorosilane. In the present invention, since a photocatalyst functional layer described later is provided on the hard coat layer, it is preferable that the cured product of the hydrolysis-condensation product of the alkoxysilanes in the hard coat layer does not have an organic group. Therefore, it is desirable to use tetraalkoxysilane, trialkoxysilane hydride, and dialkoxysilane dihydride as the alkoxysilanes, and to completely hydrolyze them, but it is necessary to prevent cracks from occurring and to adhere to the photocatalytic functional layer. Therefore, an alkyltrialkoxysilane can be used in combination.

To form the hard coat layer in the present invention, first, a coating solution containing the metal oxide particles, the silane compound and a small amount of a hydrolysis catalyst is prepared in a suitable solvent. Then, a known method such as bar coating, knife coating, roll coating, blade coating, die coating, gravure coating, or curtain coating of the coating liquid on the primer layer formed as described above. The coating may be applied and heat-treated at a temperature of about 80 to 160 ° C. for about 30 seconds to 5 minutes. This drying temperature is 8
If the temperature is lower than 0 ° C, the solvent may remain in the hard coat layer or the curing may be insufficient. On the other hand, if the temperature exceeds 160 ° C, the shrinkage of the base material may cause a loss of smoothness. In this way, a hard coat layer composed of metal oxide particles and a cured product of a silane compound, which is excellent in scratch resistance and weather resistance and has few cracks, is formed. The hard coat layer is formed by a sol-gel method, but since it contains metal oxide particles, shrinkage during drying and curing is suppressed and curling of the hard coat film is prevented. This effect is efficiently exhibited when the metal oxide particles are particles having an amorphous property, because the affinity for the cured product of the silane compound is good. Suitable examples of the metal oxide particles include tin oxide particles and antimony-doped tin oxide (ATO) particles.

The content ratio of the metal oxide particles and the cured product of the silane compound in the hard coat layer is 8: 2 by weight.
The range of 2 to 8 is preferable. If the amount of the metal oxide particles is larger than the above range, it is difficult to sufficiently exhibit the hard coat performance, while if it is less than the above range, the curling effect may not be sufficiently exhibited, and the adhesion with the photocatalytic functional layer may be insufficient. It may decrease. A more preferable content ratio of the metal oxide particles and the cured product of the silane compound is selected in the range of 7: 3 to 3: 7 by weight. Also,
The thickness of the hard coat layer is usually in the range of 1 to 20 μm. If the thickness is less than 1 μm, the scratch resistance and the adhesion to the photocatalytic functional layer are not sufficiently exhibited, while if it exceeds 20 μm, the flexibility of the hard coat film may be impaired. In the present invention, by selecting the type of the metal oxide particles in the hard coat layer, the hard coat layer can be provided with other functions other than the hard coat function, for example, an ultraviolet shielding function or an infrared shielding function. it can.

Specifically, as the metal oxide particles in the hard coat layer, for example, fine particles of titanium dioxide, zinc oxide, cerium oxide or the like, or hybrid particles obtained by complexing titanium dioxide fine particles with iron oxide, cerium oxide. By using hybrid particles obtained by coating the surface of the fine particles with amorphous silica, the hard coat layer is provided with an ultraviolet ray shielding function by scattering ultraviolet rays. Further, as the metal oxide particles, for example, titanium oxide, silicon dioxide, zinc oxide, indium oxide, tin oxide, zinc sulfide, etc., particularly tin oxide, AT
By using metal oxide particles of O (antimony-doped tin oxide) and ITO (indium-doped tin oxide), the hard coat layer absorbs infrared rays to impart an infrared shielding function.

When the metal oxide particles used in the hard coat layer have photocatalytic activity such as titanium dioxide, an inactivation treatment is applied to suppress deterioration of the lower primer layer due to photocatalytic action. It is preferable to use metal oxide particles. In the present invention, a photocatalytic functional layer containing titanium dioxide and silica is provided on the hard coat layer. The titanium dioxide functions as a photocatalyst, and from the viewpoint of photocatalytic activity, it has anatase type 5
Titanium dioxide containing 0% by weight or more is suitable. On the other hand, silica acts as a binder for the titanium dioxide and also has an action of improving the adhesion to the underlying hard coat layer. As a method for forming the photocatalytic functional layer on the hard coat layer, the following wet method is adopted, because the operation is simple and the photocatalytic functional layer can be formed on the hard coat layer with good adhesion. It is advantageous. In particular,
A coating liquid containing titanium dioxide particles, an alkoxysilane compound and a small amount of a hydrolysis catalyst is prepared in a suitable solvent, and the coating liquid is applied onto the hard coat layer by a known method such as a bar coating method or a knife coating method. By applying a roll coating method, a blade coating method, a die coating method, a gravure coating method, a curtain coating method, etc., and drying at a temperature of about 80 to 160 ° C. for about 30 seconds to 5 minutes,
A photocatalytic functional layer containing titanium dioxide and silica obtained by hydrolysis of an alkoxysilane compound can be formed. If the drying temperature is lower than 80 ° C., the solvent may remain in the photocatalytic functional layer or the curing may be insufficient, while if it exceeds 160 ° C., the shrinkage of the substrate may cause loss of smoothness. The alkoxysilane compound used in this case has no non-hydrolyzable organic group,
For example, tetramethoxysilane, tetraethoxysilane,
Tetra-alkoxysilanes such as tetra-n-propoxysilane, tetraisopropoxysilane, tetra-n-butoxysilane, tetraisobutoxysilane, tetra-sec-butoxysilane, tetra-tert-butoxysilane, trimethoxysilane hydride, triethoxy. Preferable examples include silane hydride and trialkoxy silane hydride such as tripropoxy silane hydride. These alkoxysilanes may be used alone or in combination of two or more. Further, an alkyltrialkoxysilane may be used in combination for the purpose of preventing the occurrence of cracks.

In this way, the photocatalytic functional layer containing titanium dioxide particles and silica is formed on the hard coat layer with good adhesion. The average particle diameter of the titanium dioxide particles used at this time is usually 1 to 1000 nm, preferably 10 to 50 nm.
It is in the range of 0 nm. The content ratio of titanium dioxide particles and silica in the photocatalytic function layer is preferably in the range of 1: 9 to 9: 1 by weight. If the amount of silica is more than the above range, the photocatalytic function may not be sufficiently exhibited,
On the other hand, if the amount is less than the above range, the function as a binder may not be sufficiently exhibited. A more preferable content ratio is in the range of 3: 7 to 7: 3. The thickness of this photocatalytic functional layer is
It is usually in the range of 0.01 to 10 μm. This thickness is 0.
If it is less than 01 μm, the photocatalytic function may not be sufficiently exerted, whereas if it exceeds 10 μm, the flexibility of the hard coat film may be impaired, or cracks may occur, resulting in poor visibility.

The photocatalytic functional layer has a surface activated by being irradiated with ultraviolet rays and exhibits hydrophilicity. However, when it is installed outdoors and it is tried to activate the surface with ultraviolet rays of sunlight, it takes a predetermined number of days. Is required, and since the activation is insufficient in the initial stage, hydrophilicity cannot be obtained and antifouling property is not exhibited. Therefore, in the present invention, a method can be used in which the photocatalytic functional layer is subjected to corona discharge treatment, plasma discharge treatment, laser light irradiation, or the like to impart hydrophilicity from the initial stage. In the present invention, when a silane compound containing an alkoxysilane having a non-hydrolyzable organic group is used in the formation of the above-mentioned hard coat layer, the cured product of the silane compound in the formed hard coat layer contains an organic compound. Since the group is introduced, the photocatalytic function of the photocatalytic functional layer may deteriorate the hard coat layer. Therefore, in this case, it is preferable to provide a layer made of silica having substantially no organic group between the hard coat layer and the photocatalytic functional layer by a sol-gel method or the like. When the hard coat film having a photocatalytic function of the present invention thus obtained is used for application to an adherend, on the surface opposite to the side where the photocatalytic functional layer of the substrate is provided, The agent layer and the release sheet can be sequentially provided.

The pressure-sensitive adhesive forming the pressure-sensitive adhesive layer is not particularly limited and can be appropriately selected from various conventionally known pressure-sensitive adhesives depending on the situation and used, but from the viewpoint of weather resistance and the like. Especially, acrylic, urethane and silicone adhesives are suitable. The pressure-sensitive adhesive layer has a thickness of usually 5 to 100 μm, preferably 10 to 60 μm. Examples of the release sheet provided on the pressure-sensitive adhesive layer include glass sheets such as glassine paper, coated paper, and laminated paper, and various plastic films coated with a release agent such as a silicone resin. The thickness of this release sheet is not particularly limited, but usually 2
It is about 0 to 150 μm. Incidentally, the pressure-sensitive adhesive layer,
If necessary, an ultraviolet absorber and a light stabilizer can be contained.

The hard coat film having a photocatalytic function of the present invention is particularly preferably used for sticking the outer surface of a window glass or a plastic board for windows for self-cleaning. When used, the release sheet may be peeled off, and the adhesive layer may be attached so that the surface of the adhesive layer contacts the object. FIG. 1 is a cross-sectional view showing the configuration of an example of a hard coat film having a photocatalytic function of the present invention, in which a hard coat film 10 having a photocatalytic function has a primer layer 2 on one surface of a substrate 1. The hard coat layer 3 is provided, and the photocatalyst functional layer 4 is further provided thereon, and the pressure-sensitive adhesive layer 5 is provided on the opposite surface of the substrate 1 if necessary.
And the release sheet 6 are sequentially provided.

[0021]

EXAMPLES Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. The physical properties of the hard coat film having a photocatalytic function produced in each example were determined according to the following points. (1) Degree of curling The hard coat film before applying the pressure-sensitive adhesive is heated at a temperature of 2
After leaving it in an environment of 3 ° C and 50% relative humidity for 24 hours,
It was cut into a square shape of 10 cm × 10 cm, placed on a flat glass plate, the distances from the glass plate at the four corners of the hard coat film were measured, and the average value was taken as the curl height. (2) Accelerated weather resistance test A hard coat film was attached to a glass plate, and using a sunshine super long life weatherometer [Suga Test Instruments Co., Ltd. "WEL-SUN-HCH"], 10
After the accelerated weather resistance test for 0 hours, the hard coat property, deterioration of the substrate and hydrophilicity were evaluated. (B) The change when the surface of the hard coat photocatalytic functional layer was rubbed with steel wool # 0000 three times was visually observed. (B) Degradation of hard coat film The presence or absence of cracks in the hard coat film was visually observed. (C) Hydrophilic contact angle measuring device [Kyowa Interface Science, trade name "CA-X15"
0 "] was used to drop a water drop from the microsyringe on the sample surface, and after 30 seconds, the contact angle with water was measured.

Example 1 Polyethylene terephthalate film [made by Toyobo Co., Ltd., trade name "A4100"] having a thickness of 100 μm was coated on one side with polyester resin [made by Toyobo Co., Ltd., trade name "Byron 20SS"]. To 100 parts by weight of the component, 2 parts by weight of 2,4-dihydroxybenzophenone was added as an ultraviolet absorber, which was applied so that the thickness after drying would be 1 μm, and dried at 100 ° C. for 1 minute to obtain a primer layer. Was formed. Next, a mixture of a silane compound consisting of 50 parts by weight of tetramethoxysilane, 45 parts by weight of methyltrimethoxysilane and 5 parts by weight of trimethoxysilane hydride, to which methanol and a catalytic amount of nitric acid were added, was added to a solution of antimony as metal oxide particles. A coating solution was prepared by adding 42 parts by weight of doped tin oxide [ATO] [manufactured by Ishihara Techno Co., Ltd., average particle size 100 nm]. This coating solution is applied to the primer layer so that the thickness after drying is 10 μm, and 1
It was heat-dried at 30 ° C. for 30 minutes to form a hard coat layer. The weight ratio of ATO to the cured product of the silane compound in this hard coat layer was 5: 5. Then, on this hard coat layer, 100 parts by weight of a titanium dioxide dispersion liquid [manufactured by Dainippon Ink and Chemicals, Inc., trade name "TF23B", solid content concentration 10% by weight, average particle size 100 nm] and an alkoxysilane solution [ A coating solution prepared by mixing 1320 parts by weight of Colcoat Co., Ltd., trade name "Colcoat P", solid content concentration 2% by weight] is applied to have a thickness after drying of 1 μm, and 100 ° C for 2 Heat dry for a minute,
A photocatalytic functional layer having a weight ratio of titanium dioxide and silica of 5: 5 was formed. Next, an acrylic pressure-sensitive adhesive [manufactured by Lintec Co., Ltd., trade name “PU-V”] was dried on the other surface of the polyethylene terephthalate film to a thickness of 20.
After being coated to a thickness of μm and dried, a release sheet [Lintec Co., Ltd., trade name “SP-PET2511”]
A hard coat film having a photocatalyst functional layer was produced by bonding with. Table 1 shows the evaluation results of the physical properties of this hard coat film.

Example 2 In Example 1, the substrate film had a thickness of 50 μm.
Polyvinyl chloride film [Japan Carbide Industry Co., Ltd.
A hard coat film having a photocatalytic functional layer was produced by performing the same operations as in Example 1 except that the product name "EP5080E-8" manufactured by the company was used. Table 1 shows the evaluation results of the physical properties of this hard coat film.

Example 3 In Example 1, the substrate film had a thickness of 50 μm.
A hard coat film having a photocatalytic function was prepared in the same manner as in Example 1, except that the polymethylmethacrylate film (trade name "AC-050S" manufactured by Asahi Chemical Industry Co., Ltd.) was used. Table 1 shows the evaluation results of the physical properties of this hard coat film.

Comparative Example 1 In the formation of the hard coat layer in Example 1, AT
A film having a photocatalytic function was prepared in the same manner as in Example 1 except that O was not added, and the physical properties were evaluated. The results are shown in Table 1. Generation of cracks was found in a 100-hour accelerated weathering test using a sunshine super long-life weatherometer.

[0026]

[Table 1]

[0027]

The hard coat film having a photocatalytic function of the present invention has a photocatalyst functional layer formed on a substrate through an inorganic hard coat layer which is excellent in scratch resistance and weather resistance and in which curling is suppressed. In particular, it is suitably used as an outer surface for self-cleaning a window glass of a high-rise building or a plastic board for a window, or as a show window.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of the constitution of a hard coat film having a photocatalytic function of the present invention.

[Explanation of symbols]

1 base material 2 Primer layer 3 hard coat layer 4 Photocatalyst functional layer 5 Adhesive layer 6 Release sheet 10 Hard coat film with photocatalytic function

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B32B 27/36 B32B 27/36 (72) Inventor Tomosei Saito 7-7-3 Saitama City Tsuji 7-7-3 Lintec Urawa Daiichi Dormitory 402 (72) Inventor Toshio Sugizaki 1663-1-103 F term, Sairai City Saitama City (reference) 4F100 AA20D AA21D AA33 AB17C AH06C AK15A AK25A AK42A AT00A BA04 BA05 BA07 BA10A BA10D BA10E4607C01 CA16E CAE CA16E JD09 JK13C JK14 JL04 JL08D JL09 JL13E 4G069 AA03 AA08 BA02A BA02B BA04A BA04B BA48A CD10 DA06 EA08 EC22Y ED04 EE06 FA01 FA03 FB23

Claims (2)

[Claims] 1. A primer layer, a hard coat layer composed of metal oxide particles and a cured product of a silane compound, and titanium dioxide and silica on one surface of a substrate composed of polyethylene terephthalate, vinyl chloride resin or acrylic resin. A hard coat film having a photocatalytic function, which comprises sequentially laminating photocatalytic functional layers containing the same. 2. The hard coat film having a photocatalytic function according to claim 1, wherein an adhesive layer is provided on the other surface of the base material.