JP4926712B2 - Near infrared light absorbing material and laminate - Google Patents

Description

  The present invention relates to a near-infrared light absorbing material and a laminate, and more particularly to a near-infrared light absorbing material and a laminate that can be applied to a laminated glass having near-infrared light absorption characteristics.

  As an optical member for use in a window material or the like, a laminated glass having a structure in which an intermediate film made of polyvinyl acetal resin, acrylic resin, or the like is sandwiched between a pair of translucent substrates made of glass or the like is known. Such a laminated glass is frequently used because it has excellent properties such as high strength and high durability.

  In recent years, these laminated glasses have been required to have characteristics capable of blocking infrared rays or light rays having wavelengths in the vicinity thereof (hereinafter referred to as “near infrared light”). If laminated glass having such characteristics is applied to window materials, wall materials, and the like, for example, light having a wavelength in the above-described region in sunlight, that is, entry of heat rays into the room can be suppressed. Thereby, it becomes possible to keep the indoor environment comfortable by suppressing the temperature from becoming excessively high, and it is also possible to reduce the cost for cooling and the like.

As a laminated glass capable of blocking near-infrared light, a glass having a layer (near-infrared light absorbing layer) having a property of absorbing near-infrared light as an intermediate film is known. Such an intermediate film can be formed by a composition in which a material having a property of absorbing near infrared light (near infrared light absorbing material) is dispersed in a resin material. For example, Patent Document 1 below discloses a laminated glass including an interlayer film containing a divalent copper ion and at least one infrared light absorbing component selected from indium oxide and / or tin oxide and a resin component. Has been.
JP 9-2111220 A

  By the way, in recent years, the laminated glass has excellent light resistance in addition to the above-described near-infrared light absorption characteristics, that is, there is little change in translucency etc. even when irradiated with light. It is required to have characteristics. A laminated glass having such characteristics can maintain high translucency even when used for a long period of time, and therefore has extremely high practicality. And although the said conventional laminated glass had the outstanding near-infrared-light absorption characteristic, when light, especially an ultraviolet light are irradiated for a long time, a black deposit may arise in an intermediate film etc. There was still room for improvement in terms of light resistance.

  Therefore, the present invention has been made in view of such circumstances, and even when irradiated with light over a long period of time, precipitates and the like are rarely generated, and the near-infrared light absorption characteristics and light resistance are reduced. An object of the present invention is to provide a near-infrared light absorbing material applicable to an intermediate film or the like that is excellent in both. Another object of the present invention is to provide a film-like molded article using such a near infrared light absorbing material and a laminate applicable to laminated glass.

  In order to achieve the above object, the near-infrared light absorbing material of the present invention is characterized by containing a polyvinyl butyral resin having a polymerization degree of 800 to 2300 and copper ions. Here, “degree of polymerization” refers to the average degree of polymerization of the polyvinyl butyral resin (the same applies hereinafter).

  According to the study by the present inventors, the black precipitate generated in the conventional laminated glass is caused by products such as copper and copper oxide generated by oxidation or reduction of copper ions contained in the intermediate film. It has been found. Such copper and copper oxide are presumed to have been generated by oxidizing or reducing copper ions by active species derived from resin components and the like produced in the intermediate film by irradiation with ultraviolet light.

  On the other hand, the near-infrared light absorbing material of the present invention contains a resin having a polymerization degree of 800 to 2300 as a polyvinyl butyral resin (hereinafter abbreviated as “PVB”) which is a resin component. And although it is not necessarily clear in such a near-infrared-light absorption material, it is thought that each component in the material is extremely stabilized.

  Therefore, even if a long period of light (particularly ultraviolet light) is irradiated to a laminated glass having an intermediate film containing such a near-infrared light absorbing material, copper ions are stabilized in the intermediate film. Therefore, the generation of copper or copper oxide can be suppressed due to factors such as difficulty in oxidation or reduction. As a result, it is considered that the generation of black precipitates due to light irradiation is greatly reduced. In addition, an effect | action is not necessarily limited to these.

  The near-infrared light absorbing material of the present invention further contains at least one phosphorus compound selected from the group consisting of phosphinic acid compounds, phosphonic acid compounds, phosphonic acid monoester compounds, phosphoric acid monoester compounds, and phosphoric acid diester compounds. It is preferable. By containing such a phosphorus compound, it is possible to obtain more excellent near-infrared light absorption characteristics, and to further improve the stability of a layer made of such a material (for example, an intermediate film).

  Moreover, it is preferable that the near-infrared light absorbing material of the present invention further contains a plasticizer. By including a plasticizer, the glass transition temperature (Tg) of PVB is lowered and softened, and mixing with copper ions and the like is further facilitated, and the solubility of copper ions in PVB is further enhanced. The translucency of the layer containing the infrared light absorbing material is improved.

  The present invention also provides a sheet-like molded article comprising the near-infrared light absorbing material of the present invention. Such a sheet-like molded product has excellent near-infrared light absorption characteristics, and even when it is irradiated with light for a long time, precipitates and the like are rarely generated. Therefore, it can be suitably used as an intermediate film in laminated glass.

  Furthermore, this invention provides a laminated body provided with a translucent base material and the near-infrared light absorption layer which consists of a near-infrared light absorption material of the said this invention provided on this translucent base material. Such a laminate is provided with a near-infrared light absorbing layer comprising the near-infrared light-absorbing composition of the present invention, so that it is extremely excellent in near-infrared light absorption characteristics, and is also precipitated by light irradiation. There are very few things and it also has excellent light resistance. Further, when the laminate is configured such that the near-infrared light absorbing layer is sandwiched between a pair of light-transmitting substrates, a laminated glass excellent in both near-infrared light absorption characteristics and light resistance is provided. be able to.

  According to the present invention, even when irradiated with light for a long period of time, precipitates and the like are less likely to occur, and a near-red color that can be applied to an intermediate film that is excellent in both near-infrared light absorption characteristics and light resistance. An external light absorbing material can be provided. Moreover, it becomes possible to provide a film-like molded article using such a near-infrared light absorbing material and a laminate applicable to laminated glass.

It is a figure which shows typically an example of the cross-section of the laminated glass of embodiment. It is a figure which shows typically an example of the cross-section of the laminated glass which has a reflection layer. It is a figure which shows typically an example of the cross-section of the laminated glass which has a reflection layer between the some layers provided between the translucent board | substrates. It is a figure which shows the microscope picture of the laminated glass of Example 2. FIG. It is a figure which shows the microscope picture of the laminated glass of the comparative example 4.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Translucent substrate, 2 ... Intermediate film, 10 ... Laminated glass, 20 ... Laminated glass, 21 ... Translucent substrate, 22 ... Near-infrared light absorption layer, 23 ... Reflective layer, 30 ... Laminated glass, 31 ... Translucent substrate, 32 ... near infrared light absorbing layer, 33 ... reflective layer, 34 ... resin layer.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings as necessary.
[Near-infrared light absorbing material]

  The near infrared light absorbing material according to the embodiment contains at least a polyvinyl butyral resin (PVB) having a polymerization degree of 800 to 2300 and copper ions.

(PVB)
First, PVB contained in the near infrared light absorbing material will be described. PVB has a degree of polymerization of 800-2300. Here, the degree of polymerization refers to the number of basic units constituting one molecule of PVB, and a value measured based on the method defined in JISK 6728 (2001 version) can be adopted.

  For example, PVB having such a degree of polymerization is prepared by preparing polyvinyl alcohol (PVA) having a degree of polymerization (or molecular weight) that can satisfy the degree of polymerization of PVB as described above as a precursor of PVB. What was obtained by the method of making a butyraldehyde react is mentioned. Specifically, as PVB having a degree of polymerization of 800 to 2300, for example, the following are commercially available. That is, for example, ESREC BM-5, (degree of polymerization 850), BH-3 (degree of polymerization 1700, manufactured by Sekisui Chemical Co., Ltd.) and the like.

(Copper ion)
Next, copper ions will be described. The copper ion is a divalent copper ion. The copper ions can be supplied into the near infrared light absorbing material in the form of a copper salt. Specific examples of copper salts include copper acetate anhydrides, hydrates of organic acids such as copper acetate, copper formate, copper stearate, copper benzoate, copper ethylacetoacetate, copper pyrophosphate, copper naphthenate, and copper citrate. Alternatively, a hydrate, an anhydride, a hydrate or a hydrate of a copper salt of an inorganic acid such as copper oxide, copper chloride, copper sulfate, copper nitrate, basic copper carbonate, or copper hydroxide can be used. Among these, copper acetate, copper acetate monohydrate, copper benzoate, copper hydroxide, and basic copper carbonate are preferably used. In addition, these copper salts which are copper ion sources may be used independently, and may be used in multiple combination.

(Phosphorus compound)
The near-infrared light absorbing material of the embodiment preferably contains a predetermined phosphorus compound in addition to the PVB and copper ions described above. As a phosphorus compound, the phosphoric acid ester compound represented by the following general formula (1A), the phosphinic acid compound represented by the following general formula (1B), the phosphonic acid compound represented by the following general formula (1C), and Examples include at least one phosphorus compound selected from the group consisting of phosphonic acid monoester compounds represented by the following general formula (1D).

In the above formula, n is 1 or 2, and R ¹ , R ²¹ , R ²² , R ³ , R ⁴¹ and R ⁴² each independently represents an alkyl group, a cycloalkyl group, an alkenyl group, an alkynyl group or an aryl group. , Allyl group, oxyalkyl group, polyoxyalkyl group, oxyaryl group, polyoxyaryl group, (meth) acryloyloxyalkyl group or (meth) acryloyl polyoxyalkyl group, 1-30. In these groups, at least one hydrogen atom in the group is a halogen atom, an oxyalkyl group, a polyoxyalkyl group, an oxyaryl group, a polyoxyaryl group, an acyl group, an aldehyde group, a carboxyl group, a hydroxyl group, It may be substituted with a (meth) acryloyl group, a (meth) acryloyloxyalkyl group, a (meth) acryloyl polyoxyalkyl group or an ester group. In addition, as a phosphorus compound, only 1 type of the compounds represented by said formula (1A)-(1D) may be used, and you may use in combination of multiple types. Moreover, about each of said phosphorus compound of (1A)-(1D), what has the said various functional groups may be used independently, and 2 or more types may be used in combination.

Especially, as a phosphorus compound, the phosphate ester compound (monoester and / or diester) represented by the said general formula (1A) is preferable. In the phosphate ester compound represented by the general formula (1A), examples of the group represented by R ¹ include an alkyl group, an alkenyl group, and a polymerizable functional group represented by the following general formula (2). In the following general formula (2), X represents a hydrogen atom or a methyl group, p is an integer of 2 to 6, and m is an integer of 0 to 5.

Among the functional groups represented by R ¹ described above, the alkyl group is preferably an alkyl group having 1 to 30 carbon atoms, and more preferably an alkyl group having 1 to 18 carbon atoms. Examples of such an alkyl group include an n-butyl group, an n-hexyl group, an n-octyl group, a 2-ethylhexyl group, an n-decyl group, and an n-dodecyl group. Among them, a 2-ethylhexyl group is preferable. preferable. Moreover, as an alkenyl group, an oleyl group is preferable.

  When the near-infrared light absorbing material of the embodiment contains a phosphorus compound as described above, in the near-infrared light absorbing material, the copper ion and the phosphorus compound may be present merely as a mixture, and the copper ion May react with the phosphorus compound to form a phosphorus-containing copper compound.

  In the latter case, the phosphorus-containing copper compound is a phosphorus-containing copper complex formed by ionic bonding and / or coordination bonding between a phosphorus-containing group in the phosphorus compound (for example, a phosphate group in a phosphate ester) and a copper ion. Is preferable. Such a phosphorus-containing copper compound can be prepared, for example, by mixing a copper ion raw material and a phosphorus compound and reacting them.

  The near-infrared light-absorbing material containing PVB, copper ions, and a phosphorus compound can be prepared, for example, by adding and mixing a copper ion raw material and a phosphorus compound in PVB. More specifically, PVB, a copper ion raw material and a phosphorus compound are heated and melted and kneaded, or PVB is dissolved and / or dispersed in a solvent to form a solution, and the copper ion raw material and the phosphorus compound are contained in this solution. A method of removing the solvent after adding and mixing the like can be exemplified.

(Amount of each component)
When the near-infrared light-absorbing material contains the PVB, copper ions, and phosphorus compounds described above, and the phosphorus-containing copper compound is formed by the copper ions and the phosphorus-containing compound, these components are shown below. It is preferable that they are blended in a composition ratio. That is, the content of the phosphorus-containing copper compound with respect to 100 parts by mass of PVB is preferably 0.1 to 1000 parts by mass, more preferably 1 to 500 parts by mass, and even more preferably 2 to 300 parts by mass. When the content of the phosphorus-containing copper compound with respect to PVB is less than 0.1 parts by mass, the near-infrared light absorption characteristics tend to be significantly reduced. On the other hand, when it exceeds 1000 parts by mass, the compatibility of the copper ion and the phosphorus compound is lowered, and the translucency tends to be deteriorated.

  In particular, when the near-infrared light absorbing material is a sheet-like molded product used for an interlayer film of laminated glass applied to a window material or the like, the content of the phosphorus-containing copper compound is 0 with respect to 100 parts by mass of PVB. 0.5 to 45% by mass is preferable, 1 to 40% by mass is more preferable, and 1 to 35% by mass is even more preferable.

  Further, in such a near-infrared light absorbing material, the content of copper ions and the content of phosphorus compounds are such that when these phosphorus compounds have a hydroxyl group or a hydroxyl group-derived oxygen atom (hydroxyl group or oxygen The total amount of atoms) / (copper ion content) is preferably 1 to 6, more preferably 1 to 4, more preferably 1.5 to 2.5 in terms of molar ratio. preferable. If this ratio is less than 1, the near-infrared light absorbability and visible light transmittance tend to be reduced. On the other hand, if it exceeds 6, the amount of hydroxyl groups that do not participate in coordination bonds or ionic bonds with copper ions becomes excessive, and the hygroscopicity tends to be excessive.

(Plasticizer)
In addition, the near-infrared light absorbing material of the embodiment may further include other components for adjusting various characteristics in addition to the components described above. As other components, first, a plasticizer may be mentioned. When the near-infrared light absorbing material contains a plasticizer, the solubility and / or dispersibility of copper ions in PVB tends to be further improved, and the near-infrared light absorbability and visible light transmittance are further improved. be able to.

  Examples of the plasticizer include phosphate ester plasticizers, phthalic acid plasticizers, fatty acid plasticizers, glycol plasticizers, and the like. More specifically, triethylene glycol di-2-ethylhexanoate (3GO), triethylene glycol di-2 ethyl butyrate (3GH), dihexyl adipate (DHA), tetraethylene glycol diheptanoate (4G7) , Tetraethylene glycol di-2-ethylhexanoate (4GO), triethylene glycol diheptanoate (3G7) and the like.

  When including the plasticizer mentioned above in a near-infrared-light-absorbing material, it is preferable that content of a plasticizer shall be 1-120 mass parts with respect to 100 mass parts of PVB, and shall be 1-100 mass parts. Is more preferable, and it is still more preferable to set it as 2-80 mass parts. If the content of the plasticizer is less than 1 part by mass with respect to 100 parts by mass of PVB, the solubility of copper ions and phosphorus compounds may be reduced, and the translucency may be insufficient. On the other hand, when it exceeds 100 parts by mass, PVB becomes too flexible, and for example, it tends to be difficult to use as an interlayer film in laminated glass.

(Ultraviolet light absorber)
Moreover, in order to further improve the stability with respect to ultraviolet light, an ultraviolet light absorber can be contained. Examples of the ultraviolet light absorber include benzoate compounds, salicylate compounds, benzophenone compounds, benzotriazole compounds, cyanoacrylate compounds, oxalic acid anilide compounds, triazine compounds, and the like.

  More specifically, examples of the benzoate compound include 2,4-di-t-butylphenyl-3 ′, 5′-di-t-butyl-4′-hydroxybenzoate, and examples of the salicylate compound include Examples thereof include phenyl salicylate and pt-butylphenyl salicylate.

  Examples of benzophenone compounds include 2,4-di-hydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid, 2-hydroxy-4-n-octyloxybenzophenone, 2-hydroxy-4-n-dodecyloxybenzophenone, 2,2 ′, 4,4′-tetrahydrobenzophenone, bis (5-benzoyl-4-hydroxy-2-methoxyphenyl) methane, 2,2′-dihydroxy-4 , 4′-dimethoxybenzophenone, 2,2′-dihydroxy-4,4′-dimethoxybenzophenone-5,5′-sodium disulfonate, 2,2′-dihydroxy-5-methoxybenzophenone, 2-hydroxy-4-methacryloyl Oxyethylbenzophenone, - benzoyloxy-2-hydroxybenzophenone, 2,2 ', 4,4'-tetrahydroxy benzophenone.

  Examples of the benzotriazole compounds include 2- (2′-hydroxy-5′-methylphenyl) benzotriazole, 2- (2′-hydroxy-3′-t-butyl-5′-methylphenyl) -5-chlorobenzo. Triazole, 2- (2′-hydroxy-3 ′, 5′-di-t-butylphenyl) -5-chlorobenzotriazole, 2- (2′-hydroxy-3 ′, 5′-di-t-butylphenyl) ) Benzotriazole, 2- (2'-hydroxy-5-t-octylphenyl) benzotriazole, 2- (2'-hydroxy-5-t-butylphenyl) benzotriazole, 2- [2'-hydroxy-3 ' -(3 ", 4", 5 ", 6" -tetrahydrophthalimidomethyl) -5'-methylphenyl] benzotriazole, 2- (2'-hydroxy -3 ', 5'-di-t-amylphenyl) benzotriazole, 2- (2'-hydroxy-5-t-octylphenyl) benzotriazole, 2- [2'-hydroxy-3', 5'-bis (Α, α-dimethoxybenzoyl) phenyl] benzotriazole, 2,2′-methylenebis [4- (1,1,3,3-tetramethylbutyl) -6- (2N-benzotriazol-2-yl) phenol] 2- (2′-hydroxy-5′-methacryloyloxyethylphenyl) -2H-benzotriazole, 2- (2′-hydroxy-3′-dodecyl-5′-methylphenyl) benzotriazole, methyl-3- [ 3-t-butyl-5- (2H-benzotriazol-2-yl) -4-hydroxyphenyl] propionate and polyethylene glycol Like condensates of.

  Examples of cyanoacrylate compounds include ethyl-2-cyano-3,3-diphenyl acrylate and octyl-2-cyano-3,3-diphenyl acrylate. Examples of oxalic acid anilide compounds include 2-ethoxy-2 ′. -Ethyl oxalic acid bisanilide and 2-ethoxy-5-t-butyl-2'-ethyl oxalic acid bisanilide. Examples of the triazine-based compound include 2- (4,6-diphenyl-1,3,5-triazin-2-yl) -5-[(hexyl) oxy] -phenol.

(Light stabilizer)
Furthermore, the near-infrared light absorbing material can also contain a light stabilizer for further improving the stability to light. In particular, when the ultraviolet light absorber described above and this light stabilizer are used in combination, the stability to light tends to be very good. As the light stabilizer, a hindered amine light stabilizer (HALS) or a Ni-based compound can be applied.

  More specifically, HALS includes bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate, bis (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate, 1 -[2- [3- (3,5-t-butyl-4-hydroxyphenyl) propionyloxy] ethyl] -4- [3- (3,5-di-t-butyl-4-hydroxyphenyl) propionyloxy ] -2,2,6,6-tetramethylpiperidine, 4-benzoyloxy-2,2,6,6-tetramethylpiperidine, 8-acetyl-3-dodecyl-7,7,9,9-tetramethyl- 1,3,8-triazaspiro [4,5] decane-2,4-dione, bis- (1,2,2,6,6-pentamethyl-4-piperidyl) -2- (3,5-di-t -Butyl-4-hydroxybe Diyl) -2-n-butylmalonate, tetrakis (1,2,2,6,6-pentamethyl-4-piperidyl) -1,2,3,4-butanetetracarboxylate, tetrakis (2,2,6) , 6-Tetramethyl-4-piperidyl) -1,2,3,4-butanetetracarboxylate, (Mixed 1,2,2,6,6-pentamethyl-4-piperidyl / tridecyl) -1,2,3 , 4-Butanetetracarboxylate, Mixed {1,2,2,6,6-pentamethyl-4-piperidyl / β, β, β ′, β′-tetramethyl-3,9- [2,4,8, 10-tetraoxaspiro (5,5) undecane] diethyl} -1,2,3,4-butanetetracarboxylate, (Mixed 2,2,6,6-tetramethyl-4-piperidyl / tridecyl) -1,2,3,4-butanetetracarboxylate, Mixed {2,2,6,6-tetramethyl-4-piperidyl / β, β, β ′, β′-tetramethyl-3,9- [2 , 4,8,10-tetraoxaspiro (5,5) undecane] diethyl} -1,2,3,4-butanetetracarboxylate, 2,2,6,6-tetramethyl-4-piperidyl methacrylate, 1 , 2,2,6,6-pentamethyl-4-piperidyl methacrylate, poly [(6- (1,1,3,3-tetramethylbutyl) imino-1,3,5-triazine-2,4-diyl) ] [(2,2,6,6-tetramethyl-4-piperidyl) imino] hexamethylene [(2,2,6,6-tetramethyl-4-piperidyl) iminol], dimethyl succinate polymer-with-4 - Droxy-2,2,6,6-tetramethyl-1-piperidineethanol, N, N ′, N ″, N ′ ″-tetrakis- (4,6-bis- (butyl- (N-methyl-2 , 2,6,6-tetramethylpiperidin-4-yl) amino) -triazin-2-yl) -4,7-diazadecane-1,10-diamine, dibutylamine-1,3,5-triazine-N, N'-bis (2,2,6,6-tetramethyl-4-piperidyl-1,6-hexamethylenediamine and N- (2,2,6,6-tetramethylpiperidyl) butylamine polycondensate, decane And diacid bis (2,2,6,6-tetramethyl-1- (octyloxy) -4-piperidinyl) ester.

  Ni-based light stabilizers include [2,2′-thio-bis (4-t-octylphenolate)]-2-ethylhexylamine-nickel (II), nickel dibutyldithiocarbonate, [2,2 '-Thio-bis (4-t-octylphenolate)]-butylamine-nickel (II) and the like.

(Other ingredients)
In addition, as a component for stabilizing the near infrared light absorbing material, an antioxidant, a heat stabilizer, and the like can be contained. Moreover, you may add dye, a pigment, a metal compound, etc. as a component for adjusting a color tone. Furthermore, when applying to a laminated glass, a silane compound, an alkali metal salt, an alkaline earth metal salt, etc. can also be added as a component for adjusting the adhesiveness with respect to translucent board | substrates, such as glass. Furthermore, as a resin component, in addition to the PVB, an ethylene-vinyl acetate copolymer or an acrylic resin may be contained in combination as long as the properties of the near infrared light absorbing material are not deteriorated.
[Optical member]

By using the near-infrared light absorbing material described above, various optical members having excellent properties for blocking near-infrared light can be obtained. Examples of such an optical member include first and second forms shown below.
1st form: The sheet-like molding obtained by processing a near-infrared-light-absorbing composition.
2nd form: The laminated body which has a translucent board | substrate and the near-infrared-light absorption layer which consists of a near-infrared-light absorption material provided adjacent to this translucent board | substrate.

(First form)
First, the first embodiment will be described. The optical member of the first form is a sheet-like molded product made of the above-described near-infrared light absorbing material, and specifically includes a sheet and a film. Here, the sheet is a thin plate having a thickness exceeding 250 μm. The film is a thin film having a thickness of 5 to 250 μm. These sheets or films can be produced using a known sheet or film forming method. Specific examples include a melt extrusion molding method, a stretch molding method, a calendar molding method, a press molding method, and a solution casting method.

(Second form)
Next, a 2nd form is demonstrated. The optical member of the 2nd form is a laminated body which has a translucent board | substrate and the near-infrared-light absorption layer which consists of a near-infrared-light absorption material provided adjacent to this translucent board | substrate.

  The material which comprises a translucent board | substrate is not specifically limited if it is a translucent material which has visible-light transmissivity, According to the use of an optical member, it can select suitably. From the viewpoint of obtaining good hardness, heat resistance, chemical resistance, durability, etc., glass or plastic is preferably used. Examples of the glass include inorganic glass, organic glass, and the like. Depending on the purpose, the glass has a specific function such as colored glass, UV-cut glass having a wavelength dependency on transmittance, or glass having a heat shielding function such as green glass. The glass which has can also be used. Examples of the plastic include polycarbonate, acrylonitrile-styrene copolymer, polymethyl methacrylate, vinyl chloride resin, polystyrene, polyester, polyolefin, norbornene resin, and the like, which also have a specific function like glass. May be appropriately selected and used. When there are a plurality of light-transmitting substrates, each substrate may be composed of the same type of material or may be composed of different materials.

  Such a laminate can be produced, for example, by forming a sheet or film similar to the optical member of the first embodiment described above, and then bonding the sheet or the like to the light-transmitting substrate. Examples of a method for bonding them together include a means for bonding by pressurization or pressure reduction such as a press method, a multi-roll method, and a pressure reduction method, a means for bonding by heating with an autoclave, or a combination of these.

  Moreover, as a manufacturing method of a laminated body, the method of forming a near-infrared-light absorption layer directly on a translucent base material without using the said sheet-like molding other than the method of bonding together the sheet | seat formed beforehand. Applicable. As such a method, for example, a near-infrared light absorbing material is dissolved and / or dispersed in an appropriate solvent to form a coating agent, and this solution is applied to a translucent substrate. Examples thereof include a method of forming a thin film, a covering or a thin layer made of a near-infrared light absorbing material on a light base material. The thin film formed in this way is called a coating. When forming a near-infrared light absorbing layer using such a method, for the purpose of improving the flatness of the layer, various auxiliary agents such as leveling agents and antifoaming agents are used as described above. You may add in the coating agent.

(Laminated glass)
The optical member of the second form, i.e., the laminate, is not limited to one provided with the light-transmitting substrate and the near-infrared light absorbing layer as described above, and may include a plurality of these layers. Good. Specifically, a substrate including a pair of light-transmitting substrates and an intermediate film (near-infrared light absorbing layer) made of the near-infrared light-absorbing material disposed between the light-transmitting substrates can be used. Such a laminate is called so-called laminated glass, and can be suitably used as a window material or the like.

  Here, with reference to FIG. 1, the laminated glass of suitable embodiment is demonstrated.

  Drawing 1 is a figure showing typically an example of the section structure of the laminated glass of an embodiment. A laminated glass 10 shown in FIG. 1 includes a pair of translucent substrates 1 and an intermediate film 2 (near infrared light absorption layer) sandwiched between the pair of translucent substrates 1. The intermediate film 2 is made of the near-infrared light-absorbing material of the above-described embodiment, and the light-transmitting substrate 1 can be the same as the above-described laminate.

  In the laminated glass 10 having such a structure, for example, a sheet-like molded article made of the above-mentioned near-infrared light-absorbing composition is sandwiched between a pair of translucent substrates 1, and this is pre-pressed between each layer. After the remaining air is removed, it can be manufactured by a method in which these are pressure bonded and brought into close contact with each other.

  In addition, when manufacturing the laminated glass 10 by such a manufacturing method, the sheet-like molded object which should become the intermediate film 2 produces the so-called blocking phenomenon that the said sheet | seats unite and become a lump shape at the time of the storage. It is important that there is no degassing and that the deaeration in the pre-bonding is good. When these requirements are satisfied, workability when superimposing the translucent substrate 1 and the sheet is improved, and, for example, translucency due to bubbles generated due to insufficient deaeration, etc. Decline can be prevented.

  From the viewpoint of application to a window material or the like, the laminated glass 10 is also required to be excellent in visible light transmittance, that is, in the characteristic of transmitting light in the visible light region, in addition to the characteristic of blocking near infrared light. In order to obtain excellent visible light transmittance, it is preferable that bubbles do not remain as much as possible between the translucent substrate 1 and the intermediate film 2.

  As one means for reducing the bubbles, a method using an intermediate film 2 having a large number of minute irregularities called emboss on the surface is known. According to the embossed intermediate film 2, the deaeration property in the above-described precompression bonding process and the like is good, and the remaining bubbles are extremely small and are easily taken into the intermediate film 2. As a result, the laminated glass 10 is less subject to a decrease in translucency due to bubbles.

  As the form of embossing, for example, various uneven patterns composed of a large number of convex portions and a large number of concave portions for these convex portions, various uneven patterns composed of a large number of convex strips and a large number of concave grooves for these convex strips, There are embossed shapes with various values for various form factors such as roughness, placement, size, and the like.

  As these embossments, for example, those described in Japanese Patent Laid-Open No. 6-198809, the size of the convex portion is changed, and the size and arrangement thereof are defined, and those described in Japanese Patent Laid-Open No. 9-40444 are disclosed. Surface roughness of 20-50 μm, described in JP-A-9-295839, arranged so that the ridges intersect, or described in JP-A-2003-48762, The thing which formed the smaller convex part on the main convex part is mentioned.

  In addition, as another characteristic recently required for the laminated glass 10, sound insulation is cited. According to the laminated glass having excellent sound insulation, for example, when used for a window material, the influence of ambient noise and the like can be reduced, and the indoor environment can be further improved. In general, the sound insulation performance is shown as a transmission loss amount corresponding to a change in frequency, and the transmission loss amount is defined by JISA 4708 at a constant value according to the sound insulation grade at 500 Hz or more.

  However, the sound insulation performance of a glass plate generally used as a translucent substrate in laminated glass tends to be remarkably lowered due to the coincidence effect in a frequency region centered on 2000 Hz. Here, the coincidence effect means that when a sound wave is incident on a glass plate, the transverse wave propagates through the glass plate due to the rigidity and inertia of the glass plate, and the transverse wave and the incident sound resonate. This is a phenomenon that occurs. Therefore, in general laminated glass, it is difficult to avoid a decrease in sound insulation performance in a frequency region centered on 2000 Hz, and improvement of this point is demanded.

  In this regard, it is known from the equal loudness curve that human hearing exhibits a very good sensitivity in the range of 1000 to 6000 Hz compared to other frequency regions. Accordingly, it is important to eliminate the drop in the sound insulation performance due to the coincidence effect described above in order to improve the sound insulation performance. From such a viewpoint, in order to improve the sound insulation performance of the laminated glass 10, it is necessary to alleviate the decrease in the sound insulation performance due to the coincidence effect and to prevent the minimum portion of the transmission loss due to the coincidence effect from being lowered.

  Here, as a method of imparting sound insulation to the laminated glass 10, a method of increasing the mass of the laminated glass 10, a method of compounding the glass to be the translucent substrate 1, a method of subdividing this glass area, There is a method of improving the glass plate supporting means. In addition, the sound insulation performance depends on the dynamic viscoelasticity of the interlayer film 2, and in particular, it may be influenced by the loss tangent, which is the ratio of the storage elastic modulus and the loss elastic modulus. Therefore, the sound insulation performance of the laminated glass 10 can be enhanced.

  As a means for controlling the value of the loss tangent of the intermediate film 2, for example, a method using a resin film having a specific degree of polymerization, a method for defining a resin structure as described in JP-A-4-2317443, Examples thereof include a method for defining the amount of plasticizer in the resin as described in JP-A-2001-220183. It is also known that the sound insulation performance of the laminated glass 10 can be enhanced over a wide temperature range by combining two or more different resins to form an intermediate film. For example, a method of blending a plurality of types of resins described in JP-A-2001-206742, and a method of laminating a plurality of types of resins described in JP-A-2001-206741 and JP-A-2001-226152. And a method described in Japanese Patent Application Laid-Open No. 2001-192243 for imparting a deflection to the amount of plasticizer in the intermediate film. By adopting these techniques and carrying out an appropriate combination of means such as modification of the resin structure, addition of a plasticizer, combination of two or more resins, etc., the loss tangent of the resin material on which the intermediate film 2 is to be formed The value can be controlled, and a desired sound insulation can be obtained.

  Furthermore, it is preferable that the laminated glass 10 can further develop heat shielding properties other than blocking near infrared light. As a method for improving the heat shielding property of the laminated glass 10, there is a method in which the intermediate film 2 further contains oxide fine particles having a heat shielding function. As such a method, for example, methods described in JP 2001-206743 A, JP 2001-261383 A, JP 2001-302289 A, and the like can be applied.

  Examples of the oxide fine particles that can improve the heat shielding property include tin-doped indium oxide (ITO), antimony-doped tin oxide (ATO), and aluminum-doped zinc oxide (AZO). In addition, since the intermediate film 2 containing the oxide fine particles tends to have low translucency, the particle size of the oxide fine particles can be reduced (Japanese Patent Laid-Open No. 2002-293583) or the dispersibility can be reduced. For example, a method for improving the light transmissivity may be applied. As a method for enhancing the dispersibility of oxide fine particles as in the latter case, known fine particle dispersion techniques such as mechanically dispersing the fine particles or using a dispersant can be applied.

  As a method for enhancing the heat shielding property of the laminated glass, in addition to the method of containing the oxide fine particles described above, for example, a method of containing a dye having an organic heat shielding function, or a translucent substrate having a heat shielding performance The method used is also mentioned. Examples of the former method of incorporating a dye having an organic heat-shielding function include methods described in JP-A-7-157344 and JP-A-319271. Moreover, as a translucent board | substrate which has the thermal insulation performance applicable to the latter method, Fe containing glass (for example, green glass etc.) described in Unexamined-Japanese-Patent No. 2001-151539, for example, Unexamined-Japanese-Patent No. 2001-261384 is mentioned. The glass plate which laminated | stacked the metal and metal oxide which were described in gazette and Unexamined-Japanese-Patent No. 2001-226148 is mentioned.

  Thus, the laminated glass 10 of embodiment mentioned above interrupts | blocks the near-infrared light which is a heat ray, when the near-infrared-light absorption material contained in the intermediate film 2 absorbs the light ray of a near-infrared light area | region. Although exhibiting the characteristics, the laminated glass 10 is added to the intermediate film 2 (near infrared light absorbing layer) having near infrared light absorption for the purpose of further improving the near infrared light blocking characteristics. A layer having a property of reflecting near-infrared light (near-infrared light reflection layer) may be further provided.

  FIG. 2 is a diagram schematically illustrating an example of a cross-sectional structure of a laminated glass having a reflective layer. The laminated glass 20 has a structure including a translucent substrate 21, a near infrared light absorbing layer 22, a near infrared light reflecting layer 23, and a translucent substrate 21 in this order. The same thing as the translucent substrate 1 and the intermediate film 2 in the laminated glass 10 mentioned above can be applied to the translucent substrate 21 and the near infrared light absorption layer 22.

  Examples of the near-infrared light reflection layer 23 include layers composed of metals and metal oxides. Specifically, for example, gold, silver, copper, tin, aluminum, nickel, palladium, silicon, chromium, titanium Examples thereof include simple metals such as indium and antimony, alloys, mixtures, and oxides.

  The laminated glass 20 having such a near-infrared light reflection layer 23 can be manufactured as follows, for example. That is, first, the near-infrared light reflection layer 23 is formed on one surface of the translucent substrate 21 by, for example, depositing a metal or a metal oxide. Next, a sheet-like molding to be the near-infrared light absorbing layer 22 is prepared, and the translucent substrate 21 having the near-infrared light reflecting layer 23 formed on one surface thereof is used. Arrange to touch. Furthermore, the translucent substrate 21 is overlaid on the other surface of the sheet-like molded product. The laminated glass 20 is obtained by, for example, pressing the laminate thus obtained.

  Here, when the near-infrared light reflection layer 23 is formed between the translucent substrate 21 and the near-infrared light absorption layer 22 like the laminated glass 20, the reflection layer 23 and the near-infrared light absorption layer are formed. There is a possibility that the adhesiveness with the 22 will decrease. In this case, for example, when the laminated glass 20 is broken, the translucent substrate 21 is easily peeled off and scattered, which causes a problem in terms of safety. Therefore, in order to avoid such a decrease in adhesiveness, it is preferable to further provide a layer capable of improving the adhesive force between the near infrared light absorbing layer 22 and the near infrared light reflecting layer 23. .

  As a means for improving the adhesive force as described above, for example, a polyvinyl acetal having a higher acetal degree than the near infrared light absorption layer 22 between the near infrared light absorption layer 22 and the near infrared light reflection layer 23. Or a method of providing a layer of PVB having a predetermined proportion of acetoxy groups (Japanese Patent Laid-Open No. 8-337445), or A method of providing a layer made of a predetermined silicon oil (Japanese Patent Laid-Open No. 7-314609) can be employed.

  In the laminated glass, the near-infrared light reflecting layer is not necessarily provided between the translucent substrate and the near-infrared light absorbing layer as described above. When the layer which consists of these resin is formed, the form provided between these layers may be sufficient.

  FIG. 3 is a diagram schematically illustrating an example of a cross-sectional structure of a laminated glass having a reflective layer between a plurality of layers provided between translucent substrates. The laminated glass 30 has a structure including a translucent substrate 31, a near infrared light absorbing layer 32, a near infrared light reflecting layer 33, a resin layer 34, a near infrared light absorbing layer 32, and a translucent substrate 31 in this order. Have. In the laminated glass 30, the translucent substrate 31, the near infrared light absorbing layer 32, and the near infrared light reflecting layer 33 are the same as described above. As a constituent material of the resin layer 34, a known resin material having excellent translucency can be applied, and examples thereof include polyethylene terephthalate and polycarbonate. In the laminated glass 30, if at least one near-infrared light absorption layer 32 is provided, sufficient near-infrared light absorption characteristics can be obtained. For example, the above-described two near-infrared light absorption layers One of the layers 32 may be a layer made of a resin material having no near infrared light absorption characteristics.

  Thus, by providing a reflection layer in addition to the near-infrared light absorbing layer (intermediate film), it is possible to give a more excellent near-infrared light blocking property to the laminated glass by the effect of both layers. it can. Moreover, if the method for improving the adhesion between the near-infrared light reflecting layer and the near-infrared light absorbing layer as described above is adopted, in addition to the near-infrared light blocking property, a more excellent strength can be obtained. It becomes possible to obtain the laminated glass which has.

  In a laminated body such as laminated glass having the above-described configuration, when light containing a heat ray component such as sunlight is incident, the near-infrared light absorption layer that is an intermediate film exhibits a near-infrared light absorption characteristic, thereby Heat rays in the outside light region (wavelength of about 700 to 1200 nm) are blocked. In general, light in this wavelength range tends to feel the irritating and exciting heat that burns the skin, but the light transmitted through the above-mentioned laminate is blocked by such near-infrared light. Therefore, it is mainly visible light. Therefore, if such a laminated body is used for a window material or the like, it is possible to suppress an increase in indoor or indoor temperature while efficiently capturing visible light.

  In addition, the near-infrared light absorbing layer in the laminate is less likely to oxidize copper ions or the like even when irradiated with long-time light (particularly ultraviolet light). The generation of black precipitates is extremely small. For this reason, the fall of the translucency etc. resulting from the production | generation of this precipitate do not occur easily. Therefore, the laminate (laminated glass) of the present invention has a very small decrease in translucency with long-term use, and has excellent reliability as a window material or the like.

  Thus, since the laminated body (laminated glass) of the present invention has excellent near-infrared light blocking performance, it is a building material (a building member) for taking in natural light such as sunlight or other external light. For example, window materials for automobiles, ships, aircraft or train (railway) vehicles, canopy materials for passages such as arcades, curtains, canopies for carports and garages, solarium windows or wall materials, show windows, Showcase window materials, tents or window materials, blinds, roofing materials such as stationary and temporary housing, skylights and other window materials, coating materials for painted surfaces such as road signs, sunshade materials such as parasols, and other heat shielding Can be suitably used for various members that require the above.

EXAMPLES Hereinafter, although an Example demonstrates this invention still in detail, this invention is not limited to these Examples.
[Preparation of phosphate ester copper complex]

(Preparation of 2-ethylhexyl copper phosphate complex)
As a phosphorus compound, 2-ethylhexyl phosphate (an equimolar mixture of a monoester and a diester, manufactured by Tokyo Chemical Industry Co., Ltd.) was used, and 5 g thereof was dissolved in 15 g of toluene. To the obtained solution, 2.37 g of copper acetate monohydrate was added, and acetic acid was removed while the solution was refluxed. Then, toluene was distilled off from the reaction solution to obtain 6.04 g of a 2-ethylhexyl copper phosphate complex (hereinafter referred to as “2EHPC”).

(Preparation of copper oleyl phosphate complex)
As a phosphorus compound, oleyl phosphate (an equimolar mixture of monoester and diester, manufactured by Tokyo Chemical Industry Co., Ltd.) was used, and 63.1 g thereof was dissolved in 180 g of toluene. 20.0 g of copper acetate monohydrate was added to the resulting solution, and acetic acid was removed while the solution was refluxed. Thereafter, toluene was distilled off from the reaction solution to obtain 80.4 g of an oleyl copper phosphate complex (hereinafter referred to as “OLPC”).

(Preparation of 2-ethylhexyl phosphate / oleyl phosphate mixed copper complex)
As a phosphorus compound, 15.8 g of 2-ethylhexyl phosphate (an equimolar mixture of a monoester and a diester, manufactured by Tokyo Chemical Industry) and oleyl phosphate (an equimolar mixture of a monoester and a diester, manufactured by Tokyo Chemical Industry) 8 .89 g was dissolved in 80 g of toluene. 10.0 g of copper acetate monohydrate was added to the resulting solution, and acetic acid was removed while the solution was refluxed. Thereafter, toluene was distilled off from the reaction solution to obtain 28.8 g of 2-ethylhexyl phosphate / oleyl phosphate mixed copper complex (2EHPC + OLPC).
[Production of laminated glass]

(Examples 1-4, Comparative Examples 1-4)
1.0 g of each phosphate ester copper complex obtained in the above-described preparation example was dissolved in 2.0 g of triethylene glycol-2-hexanate as a plasticizer, and this was converted into 7.0 g of PVB having various degrees of polymerization. After mixing, pressing is performed several times at 85 ° C. with a press machine (WF-50, manufactured by Shindo Metal Industry Co., Ltd.), and further pressing is performed several times at 120 ° C. to knead and form a sheet-like molded product having a thickness of 1 mm. Produced. In addition, the kind of phosphate ester copper complex used in preparation of each sheet-like molded product and the polymerization degree of PVB were as shown in Table 1.

Next, the obtained sheet-like molded product was sandwiched between two slide glasses having a length of 26 mm, a width of 76 mm, and a thickness of 1 mm to form a laminate, and the laminate was autoclaved at a temperature of 130 ° C. and a pressure of 1. Crimping was performed for 30 minutes under the condition of 2 MPa, and laminated glasses of Examples 1 to 4 and Comparative Examples 1 to 3 were obtained.
[Characteristic evaluation]

(Evaluation of blackening)
First, for each laminated glass of Examples 1 to 4 and Comparative Examples 1 to 4, a xenon weather meter (Atlas C135, manufactured by Toyo Seiki Seisakusho; light source: xenon lamp, automatic irradiation intensity: 0.87 W / m ² , black Panel temperature: 63 ° C.), ultraviolet light (UV) irradiation for 100 hours was performed.

  Next, each laminated glass after UV irradiation was observed with a microscope, and the degree of occurrence of black precipitates was evaluated. The obtained results are shown in Table 1. In Table 1, A indicates that almost no black precipitates are observed, and B indicates that a large amount of black precipitates are generated. As an example, micrographs obtained by observing the laminated glass of Example 2 and the laminated glass of Comparative Example 4 are shown in FIGS. 4 and 5, respectively.

(Measurement of visible light transmittance)
For each laminated glass of Examples 1 to 4 and Comparative Examples 1 to 4, a spectrophotometer (U) in each state immediately after production and after UV irradiation similar to the above “evaluation of blackening” was performed. -4000, manufactured by Hitachi, Ltd.). Based on these results, the visible light transmittance (Tvis (0h)) in the laminated glass immediately after production and the visible light transmittance (Tvis (100h)) in the laminated glass after UV irradiation are calculated according to a method in accordance with JISR 3106. did. Also, the value of change in visible light transmittance (ΔTvis) was calculated by subtracting the value of Tvis (0h) from the value of Tvis (100h). The obtained results are shown in Table 1.

From Table 1, the laminated glasses of Examples 1 to 4 using PVB whose polymerization degree is within the range of the present invention are compared with the laminated glasses of Comparative Examples 1 to 4 whose polymerization degree of PVB is outside the range of the present invention. As a result, it was found that the generation of black precipitates was extremely small. This is because, in FIG. 4 (laminated glass of Example 2), black precipitates are hardly seen, but in FIG. 5 (laminated glass of Comparative Example 4), a large amount of black precipitates are observed. Can also be confirmed. Furthermore, from Table 1, it was found that the laminated glasses of Examples 1 to 4 have a smaller change in visible light transmittance than the laminated glasses of Comparative Examples 1 to 4. From the above, the laminated glass obtained using the near-infrared light-absorbing material of the present invention has little deterioration in translucency even when used for a long time, and has excellent characteristics as a window material or the like. It was confirmed that
[Preparation of copper phosphonate complex]

(Adjustment of copper ethylphosphonate complex)
Ethylphosphonic acid was used as the phosphorus compound, and 0.55 g (5.00 mmol) thereof was dissolved in 10 mL of THF. To the obtained solution, 1.00 g (5.01 mmol) of copper acetate monohydrate was added and heated to reflux. The solid produced in the solution after the reaction was separated by filtration to obtain an ethylphosphonic acid copper complex.
[Production of laminated glass]

(Example 5 and Comparative Example 5)
Laminated glass was produced in the same manner as in Examples 1 to 4 and Comparative Examples 1 to 4, except that 0.14 g of an ethylphosphonic acid copper complex was used instead of 1.0 g of various phosphate ester copper complexes. As PVB, those having a polymerization degree of 1700 and 650 were used, respectively. The case where PVB having a polymerization degree of 1700 is used corresponds to Example 5, and the case where PVB having a polymerization degree of 650 is used corresponds to Comparative Example 5.
[Characteristic evaluation]

(Evaluation of blackening)
About the laminated glass of Example 5 and Comparative Example 5, except that the UV irradiation intensity was set to 0.75 W / m ² and the UV irradiation time was set to 50 hours, the above Examples 1 to 4 and Comparative Examples 1 to 4 were used. Blackening was evaluated in the same manner as the laminated glass. As a result, it was confirmed that the laminated glass of Example 5 produced significantly less black precipitates than the laminated glass of Comparative Example 5, and it was difficult for blackening to occur.

(Measurement of visible light transmittance)
About the laminated glass of Example 5 and Comparative Example 5, spectroscopic measurement is performed in the same manner as the laminated glasses of Examples 1 to 4 and Comparative Examples 1 to 4, and the visible light transmittance (Tvis (0h)) immediately after the production, And the visible light transmittance (Tvis (50h)) after performing UV irradiation similar to said "evaluation of blackening" was calculated, respectively. Further, the value of change in visible light transmittance (ΔTvis) was calculated by subtracting the value of Tvis (0h) from the value of Tvis (50h). The obtained results are shown in Table 2.

From Table 2, it was confirmed that the laminated glass of Example 5 had a small change in visible light transmittance as compared with Comparative Example 5, and it was difficult to cause a decrease in translucency.
[Preparation of copper phosphinate complex]

(Adjustment of copper dimethylphosphinate complex)
Dimethylphosphinic acid was used as the phosphorus compound, and 0.47 g (5.0 mmol) thereof was dissolved in 10 mL of toluene. To the resulting solution, 0.50 g (2.5 mmol) of copper acetate monohydrate was added and heated to reflux. The solid produced in the solution after the reaction was separated by filtration to obtain a copper dimethylphosphinate complex.
[Production of laminated glass]

(Example 6 and Comparative Example 6)
Laminated glass was produced in the same manner as in Examples 1 to 4 and Comparative Examples 1 to 4, except that 0.14 g of a dimethylphosphinic acid copper complex was used instead of 1.0 g of various phosphate ester copper complexes. As PVB, those having a polymerization degree of 1700 and 650 were used, respectively. The case where PVB having a polymerization degree of 1700 is used corresponds to Example 6 and the case where PVB having a polymerization degree of 650 is used corresponds to Comparative Example 6.
[Characteristic evaluation]

(Evaluation of blackening)
About the laminated glass of Example 6 and Comparative Example 6, except that the UV irradiation intensity was set to 0.75 W / m ² and the UV irradiation time was set to 50 hours, the above Examples 1 to 4 and Comparative Examples 1 to 4 were used. Blackening was evaluated in the same manner as the laminated glass. As a result, no black precipitate was observed in the laminated glass of Example 6, whereas a small amount of black precipitate was observed in the laminated glass of Comparative Example 6.

(Measurement of visible light transmittance)
About the laminated glass of Example 6 and Comparative Example 6, spectroscopic measurement is performed in the same manner as the laminated glasses of Examples 1 to 4 and Comparative Examples 1 to 4, and the visible light transmittance (Tvis (0h)) immediately after the production, And the visible light transmittance (Tvis (50h)) after performing UV irradiation similar to said "evaluation of blackening" was calculated, respectively. Further, the value of change in visible light transmittance (ΔTvis) was calculated by subtracting the value of Tvis (0h) from the value of Tvis (50h). The obtained results are shown in Table 3.

  From Table 3, it was confirmed that the laminated glass of Example 6 had a small change in visible light transmittance as compared with Comparative Example 6, and it was difficult to cause a decrease in translucency.

Claims (5)

At least one selected from the group consisting of polyvinyl butyral resins having a polymerization degree of 800 to 2300, copper ions, phosphinic acid compounds, phosphonic acid compounds, phosphonic acid monoester compounds, phosphoric acid monoester compounds, and phosphoric acid diester compounds. A near-infrared light-absorbing material comprising a phosphorus compound . The copper ion reacts with the phosphorus compound to form a phosphorus-containing copper complex,
The phosphorus-containing copper complexes, claim 1, wherein the steps of the solution and the copper acetate phosphorus compound are mixed in a solvent and removing the solvent from the solution, that is formed at a The near infrared light absorbing material described. NIR absorptive material according to claim 1 or 2, characterized in that it further contains a plasticizer. A sheet-like molded article comprising the near-infrared light absorbing material according to any one of claims 1 to 3 . A translucent substrate;
The near-infrared light absorption layer which consists of the near-infrared light absorption material as described in any one of Claims 1-4 provided on the said translucent base material,
A laminate comprising:

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