JP2014044341A - Optical filter, and heat ray shielding material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical filter in which transmissivity at the maximal reflectance wavelength is low, a warming rate (a ratio of an absorptance to a reflectance at the maximal reflectance wavelength) is low, and planar properties are good.SOLUTION: An optical filter comprises a support and a pigment-containing layer containing at least one kind of pigment, has a maximal reflectance of 20% or more, and the pigment contained in the pigment-containing layer is 190 mg/mor less.

Description

  The present invention relates to an optical filter and a heat ray shielding material. Specifically, the present invention relates to an optical filter and a heat ray shielding material using the optical filter.

  In recent years, heat ray shielding materials for automobiles and building windows have been developed as one of energy saving measures for reducing carbon dioxide. From the viewpoint of the heat ray shielding property (acquisition rate of solar heat), the heat ray reflection type without re-radiation is better than the heat ray absorption type with re-radiation of absorbed light into the room (about 1/3 of the absorbed solar energy). Various proposals have been made.

  Patent Document 1 has a film-like support, and a near-infrared absorbing layer formed on the support using a near-infrared absorbing composition containing an aqueous dispersion of a near-infrared absorbing dye and a polymer. In addition, it is described that a near-infrared absorption filter having improved haze value and particularly durability under high temperature and high humidity can be provided by a near-infrared absorption filter having a haze value of 4% or less. Further, Patent Document 1 did not describe reflection by a pigment.

  Patent Document 2 discloses that a near-infrared absorbing composition containing at least a near-infrared absorbing compound and a hydrophobic polymer has invisibility and near-infrared absorbing ability, has little adverse effect on the environment, and has light resistance and moisture and heat resistance. It is described that a near-infrared absorbing composition and a coated product containing the composition can be provided. Moreover, although the absorption spectrum of the pigment | dye is disclosed by patent document 2, the reflection by a pigment | dye cannot be read and there was no description.

JP 2008-181096 A JP 2010-090313 A

When this inventor used the optical filter of patent documents 1 and 2 as a heat ray shielding material, the optical filter described in these literatures is an infrared ray absorption type, and when used for heat insulation of sunlight, an infrared absorber is used. It has been found that there is a problem that the indoor temperature rises due to warming. It was also found that when pasted on a window glass, the glass breaks (becomes hot) due to the difference in temperature rise between the place where it is exposed to sunlight and the place where it is not exposed.
Moreover, about the optical filter of the comparative example 2 of patent document 1, it turned out that planar shape is bad.

  The problem to be solved by the present invention is to provide an optical filter that has a low transmittance at the maximum reflection wavelength, a low warming rate (ratio of the absorptivity with respect to the reflectance at the maximum reflection wavelength), and a good surface shape. That is.

  As a result of intensive studies to solve the above-mentioned object, the present inventors have found that a reflection band due to a dye is generated near the maximum absorption wavelength (spectral wavelength) by applying a thin layer of the dye (hereinafter referred to as abnormal reflection). Also called). On the other hand, it was found that the optical filters using the infrared absorbing dyes described in Patent Documents 1 and 2 have a high dye content and are not reflected by the dye. By utilizing the phenomenon of extraordinary reflection when this dye is applied in a thin layer, the infrared reflectivity is higher than that of a conventional optical filter of infrared absorption type, so the above problem can be solved, and it is advantageous as a heat ray shielding material. As a result, the present invention has been completed.

The present invention, which is a specific means for solving the above problems, is as follows.
[1] It has a support and a dye-containing layer containing at least one dye, has a maximum reflectance of 20% or more, and the dye contained in the dye-containing layer is 190 mg / m ² or less. An optical filter characterized by that.
[2] In the optical filter according to [1], the dye is preferably an infrared absorbing dye.
[3] The optical filter according to [1] or [2] preferably has a maximum reflection wavelength in a band of 700 to 1800 nm.
[4] In the optical filter according to any one of [1] to [3], the pigment contained in the pigment-containing layer is preferably 20 mg / m ² or more.
[5] The optical filter according to any one of [1] to [4] includes a polymer in the dye-containing layer, and a mass ratio of the polymer to the dye in the dye-containing layer is 5 or less. Is preferred.
[6] In the optical filter according to [5], the polymer is preferably an aqueous dispersion.
[7] In the optical filter according to [5] or [6], the polymer is preferably polyester, polyurethane, or polyacrylate resin.
[8] In the optical filter according to any one of [1] to [7], the thickness of the dye-containing layer is preferably 200 nm or less.
[9] In the optical filter according to any one of [1] to [8], the density of the dye in the dye-containing layer is preferably 0.25 g / cm ³ or more.
[10] A heat ray shielding material comprising the optical filter according to any one of [1] to [9].

  According to the present invention, it is possible to provide an optical filter that has a low transmittance at the maximum reflection wavelength, a low warming rate (ratio of the absorptivity with respect to the reflectance at the maximum reflection wavelength), and a good surface shape.

1 is a graph showing the reflection spectrum of the optical filter of Example 1. FIG.

  The description of the constituent elements described below may be made based on typical embodiments of the present invention, but the present invention is not limited to such embodiments. In the present specification, a numerical range represented by using “to” means a range including numerical values described before and after “to” as a lower limit value and an upper limit value.

[Optical filter]
The optical filter of the present invention has a support and a dye-containing layer containing at least one kind of dye, has a maximum reflectance of 20% or more, and contains 190 mg / m of the dye contained in the dye-containing layer. ² or less.
With such a configuration, the transmittance at the maximum reflection wavelength is low, the warming rate (the ratio of the absorptivity with respect to the reflectance at the maximum reflection wavelength) is low, and the surface shape is good. Although not bound by any theory, such a configuration can cause an abnormal reflection of the pigment and increase the maximum reflectance, and at the same time improve the surface state.
Hereinafter, a more preferable aspect of the optical filter of the present invention will be specifically described.

<Characteristics of optical filter>
The optical filter of the present invention has a maximum reflectance of 20% or more. Thereby, the transmittance | permeability in a maximum reflection wavelength can be made low, and a warming rate (ratio of the absorption factor with respect to the reflectance in a maximum reflection wavelength) can be made low.
The optical filter of the present invention preferably has a maximum reflectance of 25% or more, more preferably 30% or more, and particularly preferably 35% or more.

  The optical filter of the present invention preferably has a maximum reflection wavelength in a band of 700 to 1800 nm from the viewpoint of increasing the efficiency of heat ray reflection. The maximum reflection wavelength is more preferably in the band of 750 to 1400 nm, and particularly preferably in the band of 800 to 1100 nm.

  In the optical filter of the present invention, the transmittance at the maximum reflection wavelength is preferably less than 40%, more preferably less than 20%, and particularly preferably 10 to 0.1%.

  In the optical filter of the present invention, the absorptance at the maximum reflection wavelength is preferably 10 to 80%, more preferably 20 to 75%, and particularly preferably 30 to 70%. The absorptance at the maximum reflection wavelength can be obtained by subtracting the maximum reflectance and the transmittance at the maximum reflection wavelength from 100%.

  In the optical filter of the present invention, the warming rate at the maximum reflection wavelength (ratio of the absorption rate with respect to the reflectance at the maximum reflection wavelength) is preferably less than 4, more preferably less than 3%, and 2.5. It is particularly preferred that it is less than.

The visible light transmittance of the optical filter of the present invention is preferably 60% or more, more preferably 65% or more, and particularly preferably 70% or more. When the visible light transmittance is 60% or more, for example, when used as glass for automobiles or glass for buildings, the outside is easy to see.
The ultraviolet transmittance of the optical filter of the present invention is preferably 5% or less, and more preferably 2% or less.

<Support>
The optical filter of the present invention has a support.
There is no restriction | limiting in particular as said support body, A well-known support body can be used.
The support is not particularly limited as long as it is an optically transparent support and can be appropriately selected according to the purpose. For example, the visible light transmittance is 70% or more, preferably 80% or more. And those with high transmittance in the near infrared region.
There is no restriction | limiting in particular about the shape, structure, magnitude | size, material, etc. as said support body, According to the objective, it can select suitably. Examples of the shape include a flat plate shape, and the structure may be a single layer structure or a laminated structure, and the size may be the size of the heat ray shielding material. It can be appropriately selected according to the above.
There is no restriction | limiting in particular as a material of the said support body, According to the objective, it can select suitably, For example, polyolefin resin, such as polyethylene, a polypropylene, poly 4-methylpentene-1, polybutene-1 ,; polyethylene terephthalate, Polyester resins such as polyethylene naphthalate; polycarbonate resins, polyvinyl chloride resins, polyphenylene sulfide resins, polyether sulfone resins, polyethylene sulfide resins, polyphenylene ether resins, styrene resins, acrylic resins, polyamides Examples thereof include a film made of a cellulose resin such as a cellulose resin, a polyimide resin, and cellulose acetate, or a laminated film thereof. Among these, a polyethylene terephthalate film is particularly preferable.
There is no restriction | limiting in particular as thickness of the said support body, It can select suitably according to the intended purpose of a solar radiation shielding film, Usually, it is about 10 micrometers-500 micrometers, However, the thinner one is the viewpoint from the request | requirement of film thickness reduction. preferable. The thickness of the support is preferably 10 μm to 100 μm, more preferably 20 to 75 μm, and particularly preferably 35 to 75 μm. When the thickness of the support is sufficiently thick, adhesion failure tends to hardly occur. Moreover, when the thickness of the said support body is thin enough, when it bonds together to a building material or a motor vehicle as a heat ray shielding material, there exists a tendency for the construction as it is not too strong and to become easy to construct. Furthermore, when the support is sufficiently thin, the visible light transmittance is increased, and the raw material cost tends to be suppressed.

<Dye-containing layer>
The optical filter of the present invention has a dye-containing layer containing at least one kind of dye, and the dye contained in the dye-containing layer is 190 mg / m ² or less.
By setting the dye contained in the dye-containing layer within this range, the surface shape of the optical filter can be improved. As a method for controlling the pigment contained in the pigment-containing layer within this range, a method of adjusting the pigment coating amount when forming the pigment-containing layer by coating can be used.
The upper limit of the content of the dye contained in the dye-containing layer is preferably 150 mg / m ² or less from the viewpoint of improving the surface shape, and the maximum reflectance of the optical filter is 120 mg / m ² or less. Is more preferable from the viewpoint of suppressing the transmittance at the maximum reflection wavelength, and 100 mg / m ² or less is particularly preferable from the viewpoint of improving the warming rate.
On the other hand, the lower limit of the content of the dye contained in the dye-containing layer is 10 mg / m ² or more from the viewpoint of increasing the maximum reflectance of the optical filter and suppressing the transmittance at the maximum reflection wavelength. It is preferably 20 mg / m ² or more from the same viewpoint, and more preferably 30 mg / m ² or more from the same viewpoint.

The density of the dye in the dye-containing layer is preferably 0.25 g / cm ³ or more from the viewpoint of lowering the transmittance at the maximum reflection wavelength and lowering the warming rate, and preferably 0.30 to 1.0 g / cm. more preferably ^3, particularly preferably from 0.40~0.90g / cm ^3, more particularly preferably 0.50~0.70g / cm ^3.

(Configuration of dye-containing layer)
In the optical filter of the present invention, the thickness of the dye-containing layer is preferably 200 nm or less from the viewpoint of improving the planar shape, more preferably 50 to 200 nm, and 100 to 200 nm is the maximum reflectance. It is particularly preferable from the viewpoint of enhancing the transmittance and reducing the transmittance at the maximum reflection wavelength.

  Even if the said pigment | dye containing layer is arrange | positioned adjacent to the said support body, it may be arrange | positioned through another layer in between. The dye-containing layer is preferably disposed adjacent to the support.

(Dye)
There is no restriction | limiting in particular as said pigment | dye, A well-known pigment | dye can be used. Examples of the pigment include dyes and pigments.
The pigment is not particularly limited, and a known pigment can be used. For example, pigments described in JP-A-2005-17322, [0032] to [0039] and the like can be mentioned.
There is no restriction | limiting in particular in the said dye, A well-known dye can be used. Dyes that can be stably dissolved or dispersed in an aqueous dispersion of the polymer are preferred, and these dyes preferably have a water-soluble group. Examples of the water-soluble group include a carboxyl group and a salt thereof, a sulfo group and a salt thereof. In addition, water-soluble dyes such as cyanine dyes and barbituric acid oxonol dyes described below can be applied as aqueous solutions without dissolving them in organic solvents. preferable. These dyes are preferably used as aggregates, and particularly preferably used as J aggregates. By using a J-aggregate, it becomes easy to set the absorption wavelength of a dye having an absorption maximum in the visible region in a desired near-infrared region in a non-association state. Moreover, durability, such as heat resistance of a dye, heat-and-moisture resistance, and light resistance, can be improved. It is also a preferred form to adjust the water solubility of these dyes so that they are hardly soluble or insoluble, or in other words, to be used as lake dyes. Thereby, durability, such as heat resistance of a dye, heat-and-moisture resistance, and light resistance, can be improved, and it is preferable.

In the optical filter of the present invention, the dye is preferably an infrared absorbing dye from the viewpoint of selectively reflecting heat rays (near infrared rays).
Examples of the infrared absorbing dye include a near infrared absorbing dye described in JP-A-2008-181096, JP-A-2001-228324, JP-A-2009-244493, and JP-A 2010-90313. Near infrared absorbing compounds and the like can be preferably used.
Examples of the infrared absorbing pigment include cyanine dyes, oxonol dyes, and pyrrolopyrrole compounds.

(1) Cyanine dye The cyanine dye is preferably a methine dye such as a pentamethine cyanine dye, a heptamethine cyanine dye, or a nonamethine cyanine dye, and a methine dye described in JP-A-2001-228324 is preferred. As the cyclic group of the cyanine dye, those having a thiazole ring, an indolenine ring or a benzoindolenine ring are preferable.

  Examples of the cyanine dye used in the present invention include cyanine dyes represented by the general formula (I) in JP-A-2001-228324, and among them, pentamethine cyanine dye, heptamethine cyanine dye or nonamethine. Cyanine dyes (especially, aggregates thereof) are preferable, and pentamethine cyanine dyes, heptamethine cyanine dyes or nonamethine cyanine dyes (especially, aggregates thereof) represented by the general formula (II) of JP-A-2001-228324 Is more preferable, and a heptamethine cyanine dye represented by the general formula (II) of JP-A-2001-228324 is particularly preferable.

  Specific examples of the heptamethine cyanine dye represented by the general formula (II) in JP-A-2001-228324 are shown below, but the present invention is not limited to the following specific examples.

(2) Oxonol Dye The oxonol dye is preferably an oxonol dye represented by the general formula (II) of JP-A No. 2009-244493, and more preferably a barbituric acid oxonol dye having a barbituric acid ring.
Examples of oxonol dyes represented by the general formula (II) in JP-A-2009-244493 are shown below, but the present invention is not limited to the following specific examples.

(3) pyrrolopyrrole compound As the pyrrolopyrrole compound, a pyrrolopyrrole compound represented by general formula (1) of JP 2010-90313 A is preferred, and general formula (2) of JP 2010-90313 A, The pyrrolopyrrole compound represented by either (3) or (4) is more preferred.

  Although the specific example of the pyrrolopyrrole compound (pigment) represented by either of general formula (1)-(4) of Unexamined-Japanese-Patent No. 2010-90313 is shown below, this invention is limited to the following specific example. It is not a thing.

(polymer)
The optical filter of the present invention preferably contains a polymer in the dye-containing layer. The polymer can be used as a so-called binder in the dye-containing layer.
In the optical filter of the present invention, when the mass ratio of the polymer to the dye (polymer / dye ratio) in the dye-containing layer is 5 or less, the transmittance at the maximum reflection wavelength is lowered, and the warming rate is lowered. It is preferable from the viewpoint. The mass ratio of the polymer to the pigment in the pigment-containing layer is more preferably 0.1 to 4, particularly preferably 0.2 to 3.0, and 0.5 to 3.0. More particularly preferred.

The preferred range of the content of the polymer contained in the dye-containing layer is also related to the preferred range of the mass ratio of the polymer to the dye, but is preferably 350 mg / m ² or less, for example, from a planar viewpoint, It is preferably 30 mg / m ² or more from the viewpoint of close contact with the support.

  There is no restriction | limiting in particular as a kind of said polymer, It is more preferable to use a well-known polymer and to use a transparent polymer. Examples of the polymer include polyvinyl acetal resin, polyvinyl alcohol resin, polyvinyl butyral resin, polyacrylate resin, polymethyl methacrylate resin, polycarbonate resin, polyvinyl chloride resin, (saturated) polyester resin, polyurethane resin, gelatin, and cellulose. And polymers such as natural polymers. Among them, in the optical filter of the present invention, the polymer is preferably polyester, polyurethane, or polyacrylate resin, and is more preferably polyester from the viewpoint of adhesion to a support.

  In the optical filter of the present invention, it is preferable that the polymer is an aqueous dispersion from the viewpoint of environmental influence and the reduction of coating cost.

  In the present invention, as the polymer, Plus Coat Z-592 (manufactured by Kyoyo Chemical Co., Ltd.), which is a water-soluble polyester resin, can be preferably used.

<Method for manufacturing optical filter>
The method for producing the optical filter of the present invention is not particularly limited and can be appropriately selected depending on the purpose. For example, the dispersion containing the dye is dipped on the surface of the lower layer such as the support. Examples thereof include a method of coating by a coater, a die coater, a slit coater, a bar coater, a gravure coater, and the like, and a method of plane orientation by a method such as an LB film method, a self-organization method, and spray coating. The dye-containing layer is preferably formed by coating. That is, the dye-containing layer is preferably a dye coating layer. Among them, the method of applying with a bar coater is preferable.

  When forming the said pigment | dye content layer by application | coating, you may add other additives, such as a solvent and surfactant other than the said pigment | dye and the said polymer, to a coating liquid.

The solvent is not particularly limited and water or a known organic solvent can be used. For example, water, toluene, xylene, methyl ethyl ketone, methyl isobutyl ketone, acetone, methyl alcohol, N-propyl alcohol, 1-propyl alcohol, Various things such as propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate, cyclohexanone, cyclohexanol, ethyl lactate, methyl lactate, and caprolactam can be used. In the present invention, it is preferable to use an aqueous solvent from the viewpoint of environmental influence and the point of reducing coating cost.
The solvent may be used in combination of two or more, in addition to being used alone. In the present invention, specifically, it is more preferable to use as an aqueous solvent in which water and methanol are combined.

Examples of other additives include surfactants and additives described in JP-A-2005-17322, paragraphs [0027] to [0031].
The surfactant is not particularly limited, but may be any of aliphatic, aromatic, and fluorine surfactants, and may be any nonionic, anionic, or cationic surfactant. Examples of the surfactant include those described in JP 2011-218807 A.
Specifically, as the surfactant, Rapisol A-90 manufactured by NOF Corporation, Aronacty CL95 manufactured by Sanyo Chemical Industries, Ltd., and the like are preferably used.
The surfactants may be used in combination of two or more in addition to being used alone.

  When the dye-containing layer is formed by coating, preferred ranges of the dye coating amount and the polymer coating amount are the same as the preferred ranges of the dye content and the polymer content contained in the dye-containing layer, respectively. is there.

  When forming the said pigment | dye containing layer by application | coating, after apply | coating the said coating liquid, it is preferable to dry and solidify by a well-known method, and to form the said pigment | dye containing layer. As a drying method, drying by heating is preferable.

[Heat ray shielding material]
The heat ray shielding material of the present invention includes the optical filter of the present invention. The optical filter of the present invention may be used alone as a heat ray shielding material, or may be laminated with other functional layers. Moreover, the heat ray shielding material of the present invention may be a bonded structure bonded to glass or the like.
The heat ray shielding material of the present invention is not particularly limited as long as it is an embodiment used for selectively reflecting (absorbing as necessary) heat rays (near infrared rays), and may be appropriately selected according to the purpose. Examples of the film include a vehicle film and a laminated structure, a building material film and a laminated structure, and an agricultural film. Among these, in terms of energy saving effect, a vehicle film and a laminated structure, a building material film and a laminated structure are preferable.
In addition, in this invention, a heat ray (near infrared rays) means the near infrared rays (780 nm-1,800 nm) contained about 50% in sunlight.

  Hereinafter, the contents of the present invention will be described in more detail with reference to Examples and Comparative Examples. The materials, amounts used, ratios, processing details, processing procedures, and the like shown in the following examples can be changed as appropriate without departing from the spirit of the present invention. In addition, the scope of the present invention is not limitedly interpreted by the specific examples shown below.

  In the following examples, film thickness, spectral performance, and surface evaluation were examined for Examples 1 to 10 and Comparative Examples 1 to 5.

[Example 1]
(Preparation of pigment-containing coating solution)
The pigment | dye containing coating liquid was prepared by mixing the pigment | dye shown below, a polymer (binder polymer), surfactant, and a solvent (methanol and water).

Dye: Heptamethine dye (I-2 below) 0.7 parts by weight Binder polymer: Pluscoat Z-592 (solid content 25%) 3.1 parts by weight Aqueous dispersion surfactant A of polyester manufactured by Kyoyo Chemical Co., Ltd. : Lapisol A-90 1.0 part by mass (Nippon Yushi Co., Ltd., solid content 1% by mass)
Surfactant B: 1.2 parts by mass of Aronacty CL-95 (manufactured by Sanyo Chemical Industries, Ltd., solid content 1% by mass)
Methanol 30 parts by weight water Added to 100 parts by weight

(Production of optical filter)
On the surface of a PET film (Cosmo Shine A4300, manufactured by Toyobo Co., Ltd., thickness: 75 μm), the dye-containing coating solution prepared above was used with a wire bar, and the dye contents and polymers described in Table 1 below. The coating was performed so that the coating amount (for example, the pigment coating amount in Example 1 was 90 mg / m ² and the polymer coating amount was 94 mg / m ² ). Then, it heated at 150 degreeC for 2 minute (s), dried and solidified, and produced the optical filter of Example 1. The thickness of the dye-containing layer after drying was as shown in Table 1 below (for example, in Example 1, the average thickness was 0.14 μm (140 nm)). The average thickness can be calculated by measuring the difference between before and after coating as a thickness using a laser microscope (VK-8510, manufactured by Keyence Corporation), and averaging the thickness at these 10 points.

(Evaluation)
−Maximum reflection wavelength and maximum reflectance−
About the produced optical filter of Example 1, a reflection spectrum was measured with the ultraviolet visible near-infrared spectrometer (the JASCO Corporation make, V-670), and the wavelength from which a reflectance becomes maximum was made into the maximum reflection wavelength. The reflectance at this maximum reflection wavelength was taken as the maximum reflectance. The heat ray shielding material using an optical filter preferably has a high reflectance.

-Transmissivity, absorption rate, warming rate-
About the produced optical filter of Example 1, the transmission spectrum was measured with the ultraviolet visible near-infrared spectrometer (the JASCO Corporation make, V-670), and the transmittance | permeability in a maximum reflection wavelength was calculated | required.
The absorptivity at the maximum reflection wavelength was calculated from the reflectance at the maximum reflection wavelength and the transmittance at the maximum reflection wavelength.
The warming rate was determined by dividing the absorption rate at the maximum reflection wavelength by the maximum reflectivity. The determination was made based on the following criteria.
The heat ray shielding material using an optical filter preferably has a low transmittance at the maximum reflection wavelength, and preferably has a low warming rate.
<Evaluation criteria for transmittance>
○: Transmittance of less than 10% at the maximum reflection wavelength Δ: Transmittance of 10% or more and less than 30% at the maximum reflection wavelength ×: Transmittance of 30% or more at the maximum reflection wavelength <Evaluation criteria for warming rate>
○: Warming rate less than 4 ×: Warming rate 4 or more

-Surface-
About the produced optical filter of Example 1, surface condition determination was performed based on the following references | standards.
○: Unevenness is not observed in visual recognition, and it is applied evenly. Δ: Unevenness is slightly observed, but the difference between the maximum value and the minimum value of the maximum reflectance at 5 locations where the measurement location is changed is less than 1%. The difference between the maximum value and the minimum value of the maximum reflectivity at 5 locations where unevenness is visible and the measurement location is changed is 1% or more.

The reflection spectrum and transmission spectrum of the produced optical filter of Example 1 were measured using an ultraviolet-visible near-infrared spectrometer (manufactured by JASCO Corporation, V-670). An integrating sphere unit (INS-723, manufactured by JASCO Corporation) was used for reflection spectrum and transmission spectrum measurement.
FIG. 1 shows the reflection spectrum of the optical filter of Example 1.

[Example 2]
In Example 1, an optical filter was produced in the same manner as Example 1 except that 0.2 parts by mass of heptamethine dye (I-2) was added instead of 0.7 parts by mass.

[Example 3]
In Example 1, an optical filter was produced in the same manner as in Example 1 except that 10.7 parts by mass of Pluscoat Z-592 (solid content 25%) was added instead of 3.1 parts by mass.

[Example 4]
In Example 1, an optical filter was produced in the same manner as in Example 1 except that 1.5 parts by mass of Pluscoat Z-592 (solid content 25%) was added instead of 3.1 parts by mass.

[Example 5]
In Example 1, instead of adding 3.1 parts by mass of Pluscoat Z-592 (solid content 25%), 4.5 parts by mass, and instead of adding 0.7 parts by mass of heptamethine dye (I-2), 1. An optical filter was produced in the same manner as in Example 1 except that 0 part by mass was added.

[Example 6]
In Example 1, an optical filter was prepared in the same manner as in Example 1 except that 0.7 parts by mass of the following heptamethine dye (I-1) was added instead of 0.7 parts by mass of heptamethine dye (I-2). Produced.

[Example 7]
In Example 1, an optical filter was prepared in the same manner as in Example 1 except that 0.7 parts by mass of the following oxonol dye (I-3) was added instead of 0.7 parts by mass of heptamethine dye (I-2). Produced.

実施例１において、ヘプタメチン染料（Ｉ−２）を０．７質量部加える代わりにピロロピロール色素（Ｄ−１０）微細粒子を含む水性分散液を２５質量部加えたこと以外は実施例１と同様にして光学フィルターを作製した。 [Example 8]
Water was added to 3 parts by mass of the following pyrrolopyrrole dye (D-10) and 2 parts by mass of DispersBYK2091 (manufactured by Big Chemie) to make 100 parts by mass. Further, 50 parts by mass of 0.1 mmφ zirconia beads were added, and the mixture was treated with a planetary ball mill at 300 rpm for 5 hours. The beads were then separated by filtration, and an aqueous solution containing fine pyrrolopyrrole dye (D-10) particles. A dispersion was prepared.

Example 1 was the same as Example 1 except that 25 parts by mass of an aqueous dispersion containing fine particles of pyrrolopyrrole dye (D-10) was added instead of 0.7 parts by mass of heptamethine dye (I-2). Thus, an optical filter was produced.

[Example 9]
In Example 8, an optical filter was produced in the same manner as in Example 8 except that 3 parts by mass of the following pyrrolopyrrole dye (D-28) was added instead of adding 3 parts by mass of the pyrrolopyrrole dye (D-10). .

[Example 10]
In Example 1, instead of adding 3.1 parts by mass of Pluscoat Z-592 (solid content 25%), 4.5 parts by mass, and instead of adding 0.7 parts by mass of heptamethine dye (I-2) An optical filter was produced in the same manner as in Example 1 except that 0 part by mass was added.

[Comparative Example 1]
In Example 1, an optical filter was produced in the same manner as in Example 1 except that 16.5 parts by mass of PLUS COAT Z-592 (solid content 25%) was added instead of 3.1 parts by mass.

[Comparative Example 2]
In Example 1, an optical filter was produced in the same manner as Example 1 except that 0.07 parts by mass of heptamethine dye (I-2) was added instead of 0.7 parts by mass.

[Comparative Example 3]
In Example 2, an optical filter was produced in the same manner as in Example 2 except that 10.7 parts by mass of Pluscoat Z-592 (solid content 25%) was added instead of 3.1 parts by mass.

[Comparative Example 4]
In Example 1, instead of adding 3.1 parts by mass of Pluscoat Z-592 (solid content 25%), 3.3 parts by mass was added, and instead of adding 0.7 parts by mass of heptamethine dye (I-2), 1. An optical filter was produced in the same manner as in Example 1 except that 6 parts by mass were added.

[Comparative Example 5]
In Example 1, instead of adding 3.1 parts by mass of Pluscoat Z-592 (solid content 25%), 6.6 parts by mass, and instead of adding 0.7 parts by mass of heptamethine dye (I-2) An optical filter was produced in the same manner as in Example 1 except that 6 parts by mass were added.

Various characteristics of the optical filters of Examples 2 to 10 and Comparative Examples 1 to 5 were evaluated in the same manner as in Example 1.
The results obtained in the evaluation in each example and comparative example are shown in Table 1 below.
Table 1 below also shows the configurations of the optical filters of Examples 2 to 10 and Comparative Examples 1 to 5.

From the results of Table 1 above, it was found that the heat ray shielding material of the present invention had good transmittance, warming rate, and planar evaluation results at the maximum reflection wavelength.
In Comparative Example 1, it was found that the maximum reflectance does not satisfy the range of the present invention, and the warming rate is poor.
In Comparative Example 2, it was found that the maximum reflectance does not satisfy the range of the present invention, and the transmittance at the maximum reflection wavelength is poor.
In Comparative Example 3, it was found that the maximum reflectance does not satisfy the range of the present invention, and the warming rate is poor.
Comparative Example 4 is a simulation of Comparative Example 2 of Japanese Patent Application Laid-Open No. 2008-181096, and it was found that the pigment content did not satisfy the scope of the present invention and the surface condition was poor.
Comparative Example 5 simulates Example 5 of JP-A-2008-181096, and it has been found that the dye content does not satisfy the scope of the present invention and the warming rate is poor.

Claims (10)

A support;
A dye-containing layer containing at least one dye,
The maximum reflectance is 20% or more,
The optical filter, wherein a dye contained in the dye-containing layer is 190 mg / m ² or less.   The optical filter according to claim 1, wherein the dye is an infrared absorbing dye.   The optical filter according to claim 1, wherein the maximum reflection wavelength is in a band of 700 to 1800 nm. The optical filter according to claim 1, wherein the dye contained in the dye-containing layer is 20 mg / m ² or more. Including a polymer in the dye-containing layer,
The optical filter according to claim 1, wherein a mass ratio of the polymer to the dye in the dye-containing layer is 5 or less.   The optical filter according to claim 5, wherein the polymer is an aqueous dispersion.   The optical filter according to claim 5 or 6, wherein the polymer is polyester, polyurethane, or polyacrylate resin.   The optical filter according to claim 1, wherein the dye-containing layer has a thickness of 200 nm or less. The optical filter according to claim 1, wherein the density of the dye in the dye-containing layer is 0.25 g / cm ³ or more.   The heat ray shielding material characterized by including the optical filter as described in any one of Claims 1-9.

Images