JP2014139617A - Near-infrared absorbing composition, near-infrared cut filter using the same and method for manufacturing near-infrared cut filter, and camera module and method for manufacturing camera module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a near-infrared absorbing composition which can maintain high near infrared shieldability when a cured membrane is used, and contains a copper complex excellent in solubility in a solvent.SOLUTION: A near-infrared absorbing composition contains: a phosphate ester copper complex obtained by reacting a phosphate ester compound represented by a general formula (I) below or salt thereof with a copper component; and a solvent. The general formula (I) (in the general formula (Ia), Rrepresents a group having a structure in which an aromatic ring is directly bonded to a neighboring oxygen atom, and Rand Rrepresent different substituents from each other).

Description

  The present invention relates to a near-infrared absorbing composition, a near-infrared cut filter using the same, a method for manufacturing the same, a camera module, and a method for manufacturing the same.

In recent years, CCDs and CMOS image sensors, which are solid-state image sensors for color images, have been used in video cameras, digital still cameras, mobile phones with camera functions, etc., but these solid-state image sensors are sensitive to near infrared rays in their light receiving parts. Therefore, it is necessary to perform visibility correction, and a near-infrared cut filter (hereinafter also referred to as an IR cut filter) is often used.
As a material for forming such a near-infrared cut filter, a near-infrared absorbing composition using a phosphate copper complex is known (Patent Documents 1 and 2).

JP 2002-69305 A Japanese Patent Laid-Open No. 11-52127

  However, when the present inventors examined, when using the copper complexes described in Patent Documents 1 and 2, the solubility in a solvent is low, or when an IR cut filter is formed using a composition containing the copper complex, It was found that high near infrared shielding properties could not be maintained. The present invention aims to solve such problems, and is an infrared absorbing composition capable of maintaining high near-infrared shielding properties when used as a cured film, and is soluble in a solvent. It aims at providing the near-infrared absorptive composition containing the copper complex excellent in this.

（一般式（Ｉａ）中、Ｒ¹は隣接する酸素原子に芳香環が直接結合した構造を有する基を表し、Ｒ¹とＲ²とは互いに異なる置換基を表す。）
＜２＞銅を中心金属とし、下記一般式（Ｉ）で表されるリン酸エステル化合物を配位子とするリン酸エステル銅錯体、または、下記式（ＩＩ）で表される構造を含有する銅錯体、および、溶剤を含有する近赤外線吸収性組成物。
一般式（Ｉ）

（一般式（Ｉ）中、Ｒ¹は隣接する酸素原子に芳香環が直接結合した構造を有する基を表し、Ｒ¹とＲ²とは互いに異なる置換基を表す。）
一般式（ＩＩ）

（一般式（ＩＩ）中、Ｒ¹は隣接する酸素原子に芳香環が直接結合した構造を有する基を表し、Ｒ¹とＲ²とは互いに異なる置換基を表す。「＊」は、銅と配位結合する部位を示す。）
＜３＞前記Ｒ¹における芳香環が、無置換のアリール基を表す、＜１＞または＜２＞に記載の近赤外線吸収性組成物。
＜４＞前記Ｒ²がアルキル基またはアリール基を表す、＜１＞〜＜３＞のいずれかに記載の近赤外線吸収性組成物。
＜５＞前記Ｒ²がアリール基を表す、＜１＞〜＜４＞のいずれかに記載の近赤外線吸収性組成物。
＜６＞前記Ｒ¹と前記Ｒ²が互いに構造異性体ではない、＜１＞〜＜５＞のいずれかに記載の近赤外線吸収性組成物。
＜７＞硬化性化合物をさらに含有する、＜１＞〜＜６＞のいずれかに記載の近赤外線吸収性組成物。
＜８＞前記硬化性化合物が、３官能以上の（メタ）アクリレートおよび／またはエポキシ樹脂である、＜７＞に記載の近赤外線吸収性組成物。
＜９＞＜１＞〜＜８＞のいずれかに記載の近赤外線吸収性組成物を用いて得られた近赤外線カットフィルタ。
＜１０＞固体撮像素子基板の受光側において、＜１＞〜＜８＞のいずれかに記載の近赤外線吸収性組成物を塗布することにより膜を形成する工程を有する、近赤外線カットフィルタの製造方法。
＜１１＞固体撮像素子基板と、前記固体撮像素子基板の受光側に配置された近赤外線カットフィルタとを有するカメラモジュールであって、前記近赤外線カットフィルタが＜９＞に記載の近赤外線カットフィルタまたは＜１０＞に記載の近赤外線カットフィルタの製造方法で得られた近赤外線カットフィルタである、カメラモジュール。
＜１２＞固体撮像素子基板と、前記固体撮像素子基板の受光側に配置された近赤外線カットフィルタとを有するカメラモジュールの製造方法であって、固体撮像素子基板の受光側において、＜１＞〜＜８＞のいずれかに記載の近赤外線吸収性組成物を塗布することにより膜を形成する工程を有する、カメラモジュールの製造方法。
＜１３＞銅を中心金属とし、下記一般式（Ｉ）で表されるリン酸エステル化合物を配位子とするリン酸エステル銅錯体。
一般式（Ｉ）

（一般式（Ｉ）中、Ｒ¹は隣接する酸素原子に芳香環が直接結合した構造を有する基を表し、Ｒ¹とＲ²とは互いに異なる置換基を表す。）
＜１４＞銅を中心金属とし、下記一般式（ＩＩＩ）で表されるリン酸エステル化合物を配位子とするリン酸エステル銅錯体。
一般式（ＩＩＩ）

（一般式（ＩＩＩ）中、Ｒ²は、−ＣＨ（ＣＨ₂ＣＨ₃）（ＣＨ₂）₄ＣＨ₃、−ＣＨ₂ＣＨ₂ＯＣＨ₃、

および下記一般式（ＩＩＩ−ａ）で表される基のいずれかを表す。）
（一般式（ＩＩＩ−ａ）

（前記「＊」は、隣接する酸素原子との結合部位を示す。Ｒは、−ＣＨ₃、−ＣＯＯＣＨ₃、−Ｆおよび−ＣＦ₃のいずれかの基を表す。） Under such circumstances, as a result of intensive studies by the present inventors, a phosphate ester compound or a salt thereof having a group having a structure in which an aromatic ring is directly bonded to an oxygen atom and a substituent different from this group is obtained. It discovered that the said subject could be solved by using the copper complex obtained by making it react. Although this mechanism is not clear, the structure of the copper complex obtained by using the phosphate ester compound is distorted and the color value is improved (the light absorption capacity in the near infrared region (spectroscopicity does not absorb in the visible region). As a result of improving the characteristics), it is presumed that when a cured film is formed, high near-infrared shielding properties can be maintained, and the solubility of the copper complex in the near-infrared absorbing composition in the solvent is improved.
Specifically, the above problem has been solved by the following means <1>, preferably by <2> to <14>.
The near-infrared absorptive composition containing the phosphate ester copper complex obtained by making the phosphate compound represented by the following general formula (I) or its salt react with a <1> copper component, and a solvent object.
Formula (I)

(In general formula (Ia), R ¹ represents a group having a structure in which an aromatic ring is directly bonded to an adjacent oxygen atom, and R ¹ and R ² represent different substituents.)
<2> A phosphate copper complex having copper as a central metal and a phosphate ester compound represented by the following general formula (I) as a ligand, or a structure represented by the following formula (II) The near-infrared absorptive composition containing a copper complex and a solvent.
Formula (I)

(In general formula (I), R ¹ represents a group having a structure in which an aromatic ring is directly bonded to an adjacent oxygen atom, and R ¹ and R ² represent different substituents.)
Formula (II)

(In the general formula (II), R ¹ represents a group having a structure in which an aromatic ring is directly bonded to an adjacent oxygen atom, and R ¹ and R ² represent different substituents. “*” Represents copper and Indicates the site of coordination bond.)
<3> The near-infrared absorbing composition according to <1> or <2>, wherein the aromatic ring in R ¹ represents an unsubstituted aryl group.
<4> The near-infrared absorbing composition according to any one of <1> to <3>, wherein R ² represents an alkyl group or an aryl group.
<5> The near-infrared absorbing composition according to any one of <1> to <4>, wherein R ² represents an aryl group.
<6> The near-infrared absorbing composition according to any one of <1> to <5>, wherein R ¹ and R ² are not structural isomers.
<7> The near-infrared absorbing composition according to any one of <1> to <6>, further containing a curable compound.
<8> The near-infrared absorbing composition according to <7>, wherein the curable compound is a tri- or higher functional (meth) acrylate and / or an epoxy resin.
<9> A near-infrared cut filter obtained by using the near-infrared absorbing composition according to any one of <1> to <8>.
<10> Production of a near-infrared cut filter having a step of forming a film by applying the near-infrared absorbing composition according to any one of <1> to <8> on the light receiving side of the solid-state imaging device substrate. Method.
<11> A camera module having a solid-state image sensor substrate and a near-infrared cut filter disposed on a light-receiving side of the solid-state image sensor substrate, wherein the near-infrared cut filter is the near-infrared cut filter according to <9> Or the camera module which is a near-infrared cut filter obtained by the manufacturing method of the near-infrared cut filter as described in <10>.
<12> A method of manufacturing a camera module having a solid-state image sensor substrate and a near-infrared cut filter disposed on the light-receiving side of the solid-state image sensor substrate, wherein <1> to The manufacturing method of a camera module which has the process of forming a film | membrane by apply | coating the near-infrared absorptive composition in any one of <8>.
<13> A phosphate ester copper complex having copper as a central metal and a phosphate ester compound represented by the following general formula (I) as a ligand.
Formula (I)

(In general formula (I), R ¹ represents a group having a structure in which an aromatic ring is directly bonded to an adjacent oxygen atom, and R ¹ and R ² represent different substituents.)
<14> A phosphate ester copper complex having copper as a central metal and a phosphate ester compound represented by the following general formula (III) as a ligand.
Formula (III)

(In the general formula (III), R ² represents —CH (CH ₂ CH ₃ ) (CH ₂ ) ₄ CH ₃ , —CH ₂ CH ₂ OCH ₃ ,

And any one of the groups represented by the following general formula (III-a). )
(General Formula (III-a)

(The “*” represents a bonding site with an adjacent oxygen atom. R represents a group of —CH ₃ , —COOCH ₃ , —F and —CF ₃ ).

  According to the present invention, there is provided an infrared-absorbing composition that can maintain high near-infrared shielding properties when used as a cured film, and a near-infrared-absorbing composition comprising a copper complex that is excellent in solubility in a solvent. Can be provided.

It is a schematic sectional drawing which shows the structure of the camera module provided with the solid-state image sensor which concerns on embodiment of this invention. It is a schematic sectional drawing of the solid-state image sensor board | substrate which concerns on embodiment of this invention.

  Hereinafter, the contents of the present invention will be described in detail. In the present specification, “to” is used to mean that the numerical values described before and after it are included as a lower limit value and an upper limit value. The organic EL element in the present invention refers to an organic electroluminescence element.

In the present specification, “(meth) acrylate” represents acrylate and methacrylate, “(meth) acryl” represents acryl and methacryl, and “(meth) acryloyl” represents acryloyl and methacryloyl. In the present specification, “monomer” and “monomer” are synonymous. The monomer in the present invention is distinguished from an oligomer and a polymer and refers to a compound having a weight average molecular weight of 2,000 or less. In the present specification, the polymerizable compound means a compound having a polymerizable functional group, and may be a monomer or a polymer. The polymerizable functional group refers to a group that participates in a polymerization reaction. In addition, in the description of the group (atomic group) in this specification, the description which does not describe substitution and non-substitution includes what does not have a substituent and what has a substituent.
The near infrared ray in the present invention refers to those having a maximum absorption wavelength region of 700 to 2500 nm.

（一般式（Ｉ）中、Ｒ¹は隣接する酸素原子に芳香環が直接結合した構造を有する基を表し、Ｒ¹とＲ²とは互いに異なる置換基を表す。） [Phosphate copper complex]
The phosphate ester copper complex of the present invention has copper as a central metal and a phosphate ester compound represented by the following general formula (I) as a ligand. Moreover, the phosphate ester copper complex of this invention may be obtained by making the phosphate ester compound or its salt represented with the following general formula (I) react with a copper component.
Formula (I)

(In general formula (I), R ¹ represents a group having a structure in which an aromatic ring is directly bonded to an adjacent oxygen atom, and R ¹ and R ² represent different substituents.)

  The phosphate ester compound represented by the general formula (I) and a salt thereof act as a ligand coordinated to copper. Here, the ligand refers to other neutral molecules that are sterically arranged around the copper atom in the copper complex and bonded to the copper atom.

In general formula (I), R ¹ represents a group having a structure in which an aromatic ring is directly bonded to an adjacent oxygen atom, and for example, an aryl group or a heteroaryl group is preferable. Although this mechanism is not clear, in general formula (I), R ¹ has a structure in which an aromatic ring is directly bonded to an adjacent oxygen atom, and thus can be obtained using, for example, the phosphate ester compound of the present invention. It is estimated that the solubility of the copper complex in the near-infrared absorbing composition of the present invention can be improved because the structure around the copper complex can be distorted more effectively. The
As the aryl group for R ^1, an aryl group having 6 to 18 carbon atoms is preferable, an aryl group having 6 to 14 carbon atoms is more preferable, an aryl group having 6 to 10 carbon atoms is further preferable, and the aryl group has no substituent. An aryl group having 6 to 10 carbon atoms is more preferable. The aryl group for R ¹ is preferably a 6-membered ring. The aryl group may be a single ring or a condensed ring, and is preferably a single ring. As the condensed ring, 2 to 8 condensed rings are preferable, and 2 to 4 condensed rings are more preferable. Specifically, the aryl group in R ¹ is preferably a phenyl group having no substituent.
The heteroaryl group for R ¹ is preferably a 5-membered ring or a 6-membered ring. The heteroaryl group is a single ring or a condensed ring, preferably a single ring or 2 to 8 condensed rings, and more preferably a single ring or 2 to 4 condensed rings. Specifically, a heteroaryl group derived from a monocyclic or polycyclic aromatic ring containing at least one of nitrogen, oxygen and sulfur atoms is used. Examples of the heteroaryl ring in the heteroaryl group include, for example, oxazole ring, thiophene ring, thiathrene ring, furan ring, pyran ring, isobenzofuran ring, chromene ring, xanthene ring, phenoxazine ring, pyrrole ring, pyrazole ring, Isothiazole ring, isoxazole ring, pyrazine ring, pyrimidine ring, pyridazine ring, indolizine ring, isoindolizine ring, indole ring, indazole ring, purine ring, quinolidine ring, isoquinoline ring, phthalazine ring, naphthyridine ring, quinazoline ring, Examples thereof include sinoline ring, pteridine ring, carbazole ring, carboline ring, phenanthrine ring, acridine ring, perimidine ring, phenanthrolin ring, phthalazine ring, phenazazine ring, phenoxazine ring, and furazane ring.

In general formula (I), R ² represents a substituent different from R ¹ . The phosphate ester copper complex of the present invention includes, for example, the case where R ¹ and R ² in the general formula (I) are structural isomers, but it is preferable that R ¹ and R ² are not structural isomers. .
In general formula (I), it is preferable that the formula weight of R ^{1 and} the formula weight of R ² are different. In the general formula (I), the formula amount of R ¹ is preferably 50 to 200, and more preferably 60 to 100. Further, in the general formula (I), the formula weight of R ² is not particularly limited, but is preferably 50 to 200, 60 to 100 is more preferable. Here, the formula weight of R ¹ and R ^2, means the sum of the mass R ¹ and R ² per molecule represented by the compounds by the general formula (I).
R ¹ and R ^{2 in} general formula (I) are not particularly limited as long as they are different from each other, and examples thereof include organic groups. R ² is preferably an alkyl group, an aryl group or a heteroaryl group, more preferably a substituted or unsubstituted aryl group or a substituted or unsubstituted alkyl group, and further preferably a substituted aryl group or a substituted alkyl group.
The alkyl group in R ² may be any of chain, branched, and cyclic. As an alkyl group, a C3-C20 alkyl group is preferable, a C3-C10 alkyl group is more preferable, and a C3-C8 alkyl group is further more preferable. Specifically, propyl group, isopropyl group, n-butyl group, 2-ethylhexyl group and the like are exemplified.
As the aryl group for R ^2, an aryl group having 6 to 18 carbon atoms is preferable, an aryl group having 6 to 14 carbon atoms is more preferable, and an aryl group having 6 to 10 carbon atoms having a substituent is further preferable. Specific examples include a phenyl group and a naphthyl group, and a phenyl group having a substituent is more preferable.
The heteroaryl group in R ² has the same meaning as the heteroaryl group in R ¹ , and the preferred range is also the same.

When the alkyl group, aryl group and heteroaryl group described above have a substituent, the substituent includes a polymerizable group (preferably a polymerizable group containing a carbon-carbon double bond), a halogen atom (fluorine atom, chlorine). Atom, bromine atom, iodine atom), alkyl group, carboxylic acid ester group, halogenated alkyl group, alkoxy group, methacryloyloxy group, acryloyloxy group, ether group, sulfonyl group, sulfide group, amide group, acyl group, carboxyl group Etc. are exemplified.
Examples of the polymerizable group include a polymerizable group containing a carbon-carbon double bond (preferably a vinyl group, a (meth) acryloyloxy group), an epoxy group, and an aziridinyl group. Among these, a polymerizable group containing a carbon-carbon double bond is preferable.
As the halogen atom, a fluorine atom is preferable.
As a halogenated alkyl group, a fluoroalkyl group is preferable, a perfluoroalkyl group is more preferable, a C1-C10 perfluoroalkyl group is more preferable, and a trifluoromethyl group is further more preferable.
As an alkyl group, a C1-C5 alkyl group is preferable, a methyl group or an ethyl group is more preferable, and a methyl group is further more preferable.
Examples of the carboxylic acid ester include a carboxylic acid methyl group, a carboxylic acid ethyl group, a carboxylic acid propyl group, and a carboxylic acid butyl group, and a carboxylic acid methyl group is preferable.

In the phosphoric ester copper complex of the present invention, in the general formula (I), R ¹ is preferably an aryl group or a heteroaryl group, and R ² is preferably an alkyl group or an aryl group. In particular, R ¹ is a phenyl group, and R ² is preferably an alkyl group having a substituent or an aryl group having a substituent.
In particular, in R ² , when the alkyl group has a substituent, the substituent is preferably an alkoxy group or an acryloyloxy group, and more preferably a methacryloyloxy group. In R ² , when the aryl group has a substituent, examples of the substituent include a halogen atom (more preferably a fluorine atom), an unsubstituted alkyl group (more preferably a methyl group), and a perfluoroalkyl group (more preferably A trifluoromethyl group) and a carboxylic acid ester group (more preferably a carboxylic acid methyl ester group) are preferred, and a fluorine atom, a trifluoromethyl group and a carboxylic acid ester group are more preferred.

（一般式（ＩＩ）中、Ｒ¹は隣接する酸素原子に芳香環が直接結合した構造を有する基を表し、Ｒ¹とＲ²とは互いに異なる置換基を表す。「＊」は、銅と配位結合する部位を示す。）
前記一般式（ＩＩ）中、Ｒ¹およびＲ²は、前記一般式（Ｉ）中におけるＲ¹およびＲ²と同義であり、好ましい範囲も同様である。 Further, the phosphate ester copper complex of the present invention may be a phosphate ester copper complex containing a structure represented by the following formula (II).
Formula (II)

(In the general formula (II), R ¹ represents a group having a structure in which an aromatic ring is directly bonded to an adjacent oxygen atom, and R ¹ and R ² represent different substituents. “*” Represents copper and Indicates the site of coordination bond.)
In the general formula (II), R ¹ and R ² has the same meaning as R ¹ and R ² in the general formula (I), and preferred ranges are also the same.

The molecular weight of the phosphate ester compound represented by the general formula (I) and the formula weight of the phosphate ester compound containing the structure represented by the general formula (II) are preferably 200 to 1000, 250 to 750 is more preferable, and 300 to 500 is more preferable.
Specific examples of the phosphate ester compound represented by the general formula (I) or the phosphate ester compound containing the structure represented by the general formula (II) include the exemplified compounds shown in the following table. It is not limited. Moreover, the salt of the exemplary compound of the following table | surface can also be used.
In the following table, R ¹ and R ² represent different substituents. For example, A1 is an alkyl group in which R1 is a phenyl group and R2 is R.
In the following table, each R independently represents any of a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group, and an octyl group. X represents any one of a fluorine atom, a chlorine atom, a bromine atom and an iodine atom.
In the following table, the substitution position of a substituent (for example, R, X, CX ₃ etc.) is any one of 2-position, 3-position, 4-position, 5-position or 6-position in the case of a benzene substituent. Represents. In the case of the substituted naphthalene, it represents any one of the 2-position, 3-position, 4-position, 4a-position, 5-position, 6-position, 7-position, 8-position or 8a-position, respectively. In the case of anthracene substitution, any one of 2-position, 3-position, 4-position, 4a-position, 5-position, 6-position, 7-position, 8-position, 8a-position, 9-position, 9a-position, 10-position or 10a-position Represents one. In the case of substituted pyrene, the 2nd, 3rd, 3a, 4th, 5th, 5a, 6th, 7th, 8th, 8a, 9th, 10th, 10a, 10b positions, respectively Or any one of the 10c positions.
In addition, among A93, A154, A173, A211, A230, A268, and A287 in the above compounds, R ¹ and R ² represent different groups.

（一般式（ＩＩＩ）中、Ｒ²は、−ＣＨ（ＣＨ₂ＣＨ₃）（ＣＨ₂）₄ＣＨ₃、−ＣＨ₂ＣＨ₂ＯＣＨ₃、

および下記一般式（ＩＩＩ−ａ）で表される基のいずれかを表す。）
（一般式（ＩＩＩ−ａ）

（前記「＊」は、隣接する酸素原子との結合部位を示す。Ｒは、−ＣＨ₃、−ＣＯＯＣＨ₃、−Ｆおよび−ＣＦ₃のいずれかの基を表す。） The phosphate ester copper complex of the present invention is more preferably one having copper as a central metal and a phosphate ester compound represented by the following general formula (III) or a salt thereof as a ligand.
Formula (III)

(In the general formula (III), R ² represents —CH (CH ₂ CH ₃ ) (CH ₂ ) ₄ CH ₃ , —CH ₂ CH ₂ OCH ₃ ,

And any one of the groups represented by the following general formula (III-a). )
(General Formula (III-a)

(The “*” represents a bonding site with an adjacent oxygen atom. R represents a group of —CH ₃ , —COOCH ₃ , —F and —CF ₃ ).

As a method for synthesizing the phosphate ester compound used in the present invention, for example, a known method for synthesizing a phosphate ester compound can be referred to. For example, the following phosphate ester compound is obtained by adding a pyridine solution of 1,3,5-triisopropylsulfonic acid chloride to a pyridine solution of 2-hydroxyethyl methacrylate and phenyl phosphate ester at 5 ° C. or less, and adding 6 The reaction is terminated by stirring for a period of time. In order not to raise the temperature by 30 ° C. or more, a 10% aqueous sodium hydrogen carbonate solution is added, followed by washing with ethyl acetate. The aqueous layer is adjusted to pH 1 by adding concentrated hydrochloric acid, and the target product is extracted with ethyl acetate. After the solvent is distilled off, chloroform / water solution is used to remove 1,3,5-triisopropylsulfonic acid by-product generated during the reaction, and finally the organic solvent is distilled off to obtain a phosphate ester compound. be able to.
Moreover, in the synthesis | combination of the phosphate ester copper complex of this invention, you may use phosphonic acids, such as Phosmer M, Phosmer PE, Phosmer PP (made by Unichemical Co., Ltd.), as a commercial item.

Copper in the phosphate ester copper complex is usually divalent copper.
As the above-described copper component, copper or a compound containing copper can be used. As the compound containing copper, for example, copper oxide or a copper salt can be used. The copper salt is preferably monovalent or divalent copper, and more preferably divalent copper. Copper salts include copper acetate, copper chloride, copper formate, copper stearate, copper benzoate, copper ethyl acetoacetate, copper pyrophosphate, copper naphthenate, copper citrate, copper nitrate, copper sulfate, copper carbonate, copper chlorate Copper (meth) acrylate and copper perchlorate are more preferable, and copper acetate, copper chloride, copper sulfate, copper benzoate, and copper (meth) acrylate are more preferable.
As a salt of the phosphate ester compound used in the present invention, for example, a metal salt is preferable, and specific examples include sodium salt, potassium salt, magnesium salt, calcium salt, borate and the like.
As a reaction ratio at the time of making a copper component react with the phosphoric acid diester compound or its salt mentioned above, it is preferable to set it as a copper component: phosphoric acid diester compound or its salt = 1: 1-1: 6 by molar ratio. .
Moreover, it is preferable that the reaction conditions at the time of making a copper component, and the phosphoric acid diester compound mentioned above or its salt react are 0-140 degreeC, and shall be 10 minutes or more, for example.

The phosphoric acid diester copper complex of the present invention has a maximum absorption wavelength in the near infrared wavelength region of 700 to 2500 nm, preferably a maximum absorption wavelength of 720 to 900 nm, more preferably 750 to 850 nm, particularly 790 to 790 nm. 830 nm is preferable. The maximum absorption wavelength can be measured using, for example, Cary 5000 UV-Vis-NIR (Spectrophotometer manufactured by Agilent Technologies).
Further, the phosphate ester copper complex of the present invention preferably has a gram absorbance of 0.04 or more (g / mL), more preferably 0.06 or more (g / mL), and more preferably 0.08 or more. (G / mL) is more preferable. Gram absorbance can be measured using, for example, a Cary 5000 UV-Vis-NIR (Spectrophotometer manufactured by Agilent Technologies).

  By using the phosphate ester copper complex of the present invention as described above, it is an infrared absorbing composition capable of maintaining high near-infrared shielding properties when used as a cured film, and has excellent solubility in a solvent. The near-infrared absorptive composition containing a copper complex can be provided.

[Near-infrared absorbing composition]
The near-infrared absorbing composition of the present invention (hereinafter also referred to as the composition of the present invention) contains the above-described phosphate ester copper complex.
The composition of the present invention is an infrared-absorbing composition that can maintain a high near-infrared shielding property when used as a cured film by using the above-described phosphate ester copper complex of the present invention, The near-infrared absorptive composition containing the copper complex excellent in solubility can be provided.
The composition of the present invention contains at least a phosphate ester copper complex. As described above, the phosphate ester copper complex is in the form of a copper complex (copper compound) in which a phosphate compound or a salt thereof is coordinated to copper as a central metal. Copper in the phosphate ester copper complex of the present invention is usually divalent copper. For example, the above-described phosphate ester compound or a salt thereof is mixed and reacted with a copper component (copper or a compound containing copper). Can be obtained. Here, if the copper component and the phosphate ester structure can be detected from the composition of the present invention, it can be said that the phosphate copper complex is formed in the composition of the present invention. For example, as a method for detecting copper and a phosphate compound from the composition of the present invention, an ICP emission analysis method can be mentioned, and copper and a phosphate compound can be detected by this method.

It is preferable that the compounding quantity of the phosphate ester copper complex in the composition of this invention contains a phosphate ester copper complex in the ratio of 5-60 mass% with respect to the composition of this invention, More preferably, it is 10-10. 40% by mass.
30-90 mass% is preferable, as for the compounding quantity in solid content in the composition of this invention of a phosphate ester copper complex, 35-85 mass% is more preferable, and 40-80 mass% is further more preferable.

The composition of the present invention is substantially a copper complex other than the above-described phosphate ester copper complex of the present invention, for example, R ¹ and R ^{2 in the} formula (I) or the formula (II) are the same. The so-called symmetric type copper phosphate copper complex may or may not be contained. Here, “substantially free” means that the blending amount of the phosphate ester copper complex in which R ¹ and R ² in the formula (I) or the formula (II) are the same in the composition of the present invention is 1 It means that it is less than or equal to mass%, more preferably less than or equal to 0.1 mass%, and particularly preferably 0 mass%.
Moreover, the composition of this invention may contain the 2 or more types of phosphate ester copper complex mentioned above substantially. Here, “substantially free” means that the blending amount of the phosphate copper complex represented by the formula (I) or the formula (II) in the composition of the present invention is 1% by mass or less. This is more preferably 0.1% by mass or less, and particularly preferably 0% by mass.
That is, the following aspects are also included in the present invention.
(First embodiment) A near-infrared absorbing composition containing two or more (preferably two) phosphate ester copper complexes of the present invention.
(Second embodiment) One or more (preferably one) of the phosphoric acid ester copper complex of the present invention and phosphorus in which R ¹ and R ^{2 in the} formula (I) or the formula (II) are the same. A near-infrared absorbing composition containing one or more (preferably one) acid ester copper complex.

<Solvent>
The composition of the present invention further contains a solvent. Only one type of solvent may be used, or two or more types may be used, and in the case of two or more types, the total amount falls within the above range. In the composition of the present invention, the solid content of the near-infrared absorbing composition is preferably 35 to 90% by mass, more preferably 40 to 80% by mass, and more preferably 45 to 70% by mass. It is preferable. That is, the solvent is preferably contained at a ratio of 10 to 65% by mass with respect to the composition of the present invention, more preferably 20 to 60% by mass with respect to the composition of the present invention. It is especially preferable that 30-55 mass% is contained.
The solvent used in the present invention is not particularly limited and can be appropriately selected depending on the purpose as long as it can uniformly dissolve or disperse each component of the composition of the present invention. For example, alcohols, Preferred examples include ketones, esters, aromatic hydrocarbons, halogenated hydrocarbons, dimethylformamide, dimethylacetamide, dimethylsulfoxide, sulfolane and the like. These may be used alone or in combination of two or more. In this case, particularly preferably, the above-mentioned methyl 3-ethoxypropionate, ethyl 3-ethoxypropionate, ethyl cellosolve acetate, ethyl lactate, diethylene glycol dimethyl ether, butyl acetate, methyl 3-methoxypropionate, 2-heptanone, cyclohexanone, ethyl It is a mixed solution composed of two or more selected from carbitol acetate, butyl carbitol acetate, ethylene glycol monobutyl ether acetate, propylene glycol monomethyl ether, and propylene glycol monomethyl ether acetate.
Specific examples of the alcohols, aromatic hydrocarbons and halogenated hydrocarbons include those described in paragraph 0136 of JP 2012-194534 A, the contents of which are incorporated herein. Specific examples of esters, ketones, and ethers include those described in paragraph 0178 of JP2012-201643A, and further, acetate-n-amyl, ethyl propionate, dimethyl phthalate, benzoate Examples include ethyl acid, methyl sulfate, acetone, methyl isobutyl ketone, diethyl ether, and ethylene glycol monobutyl ether acetate.

<Curable compound>
The composition of the present invention preferably contains a curable compound. However, it is not always necessary when the copper complex itself is a curable compound having a polymerizable group. The curable compound may be a polymerizable compound or a non-polymerizable compound such as a binder. Moreover, although a thermosetting compound may be sufficient, a photocurable compound may be sufficient, since the reaction rate is higher, the thermosetting composition is preferable.

<Compound having a polymerizable group>
The composition of the present invention preferably contains a compound having a polymerizable group (hereinafter sometimes referred to as “polymerizable compound”). Such a compound group is widely known in the industrial field, and these can be used without particular limitation in the present invention. These may be any of chemical forms such as a monomer, an oligomer, a prepolymer, and a polymer.
The polymerizable compound may be monofunctional or polyfunctional, but is preferably polyfunctional. By including a polyfunctional compound, the near-infrared shielding property and heat resistance can be further improved. The number of functional groups is not particularly defined, but 2 to 8 functional groups are preferable.

<< A: Polymerizable monomer and polymerizable oligomer >>
In a first preferred embodiment of the composition of the present invention, a polymerizable compound is a monomer having a polymerizable group (polymerizable monomer) or an oligomer having a polymerizable group (polymerizable oligomer) (hereinafter, polymerizable with a polymerizable monomer). In some embodiments, the polymerizable oligomers may be collectively referred to as “polymerizable monomers”.

Examples of polymerizable monomers include unsaturated carboxylic acids (for example, acrylic acid, methacrylic acid, itaconic acid, crotonic acid, isocrotonic acid, maleic acid, etc.), esters thereof, and amides. These are esters of saturated carboxylic acids and aliphatic polyhydric alcohol compounds, and amides of unsaturated carboxylic acids and aliphatic polyvalent amine compounds. Also, addition reaction products of monofunctional or polyfunctional isocyanates or epoxies with unsaturated carboxylic acid esters or amides having a nucleophilic substituent such as hydroxyl group, amino group, mercapto group, monofunctional or polyfunctional. A dehydration condensation reaction product with a functional carboxylic acid is also preferably used. Further, an addition reaction product of an unsaturated carboxylic acid ester or amide having an electrophilic substituent such as an isocyanate group or an epoxy group with a monofunctional or polyfunctional alcohol, amine or thiol, and further a halogen group A substitution reaction product of an unsaturated carboxylic acid ester or amide having a detachable substituent such as a tosyloxy group and a monofunctional or polyfunctional alcohol, amine or thiol is also suitable. As another example, it is also possible to use a compound group in which an unsaturated phosphonic acid, a vinylbenzene derivative such as styrene, vinyl ether, allyl ether or the like is used instead of the unsaturated carboxylic acid.
As these specific compounds, the compounds described in paragraphs 0095 to 0108 of JP-A-2009-288705 can also be suitably used in the present invention.

  The polymerizable monomer or the like is preferably a compound having an ethylenically unsaturated group having at least one addition-polymerizable ethylene group and having a boiling point of 100 ° C. or higher under normal pressure, a monofunctional (meth) acrylate, Bifunctional (meth) acrylates and trifunctional or higher functional (meth) acrylates (eg, 3-6 functional (meth) acrylates) are preferred. Examples include monofunctional acrylates and methacrylates such as polyethylene glycol mono (meth) acrylate, polypropylene glycol mono (meth) acrylate, and phenoxyethyl (meth) acrylate; polyethylene glycol di (meth) acrylate, trimethylolethanetri (Meth) acrylate, neopentyl glycol di (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, hexanediol (Meth) acrylate, trimethylolpropane tri (acryloyloxypropyl) ether, tri (acryloyloxyethyl) iso (Meth) acrylate obtained by adding ethylene oxide or propylene oxide to polyfunctional alcohols such as anurate, glycerin and trimethylolethane, JP-B-48-41708, JP-B-50-6034, JP-A-51- Urethane (meth) acrylates as described in JP-B-37193, polyester acrylates described in JP-A-48-64183, JP-B-49-43191, JP-B-52-30490, Mention may be made of polyfunctional acrylates and methacrylates such as epoxy acrylates and the like, which are reaction products of epoxy polymers and (meth) acrylic acid, and mixtures thereof.

Among them, as the polymerizable compound, dipentaerythritol triacrylate (KAYARAD D-330 as a commercial product; manufactured by Nippon Kayaku Co., Ltd.), dipentaerythritol tetraacrylate (as a commercial product, KAYARAD D-320; Nippon Kayaku Co., Ltd.) Dipentaerythritol penta (meth) acrylate (commercially available product: KAYARAD D-310; manufactured by Nippon Kayaku Co., Ltd.), dipentaerythritol hexa (meth) acrylate (commercially available product: KAYARAD DPHA; Nippon Kayaku Co., Ltd.) And a structure in which these (meth) acryloyl groups are interposed via ethylene glycol and propylene glycol residues. These oligomer types can also be used.
A polyfunctional (meth) acrylate obtained by reacting a polyfunctional carboxylic acid with a compound having a cyclic ether group such as glycidyl (meth) acrylate and an ethylenically unsaturated group can also be used.
Further, as other preferable polymerizable monomers, etc., compounds having a fluorene ring and having two or more functional ethylenic polymerizable groups described in JP 2010-160418 A, JP 2010-129825 A, Patent 4364216, etc. Polymers can also be used.

  Further, compounds having a boiling point of 100 ° C. or higher under normal pressure and having at least one addition-polymerizable ethylenically unsaturated group are disclosed in paragraphs [0254] to [0257] of JP-A-2008-292970. The compounds described are also suitable.

  In addition, compounds described in JP-A-10-62986 as general formulas (1) and (2), together with specific examples thereof, are compounds that have been (meth) acrylated after addition of ethylene oxide or propylene oxide to the polyfunctional alcohol. Can be used as a polymerizable monomer.

（式中、ｎは、それぞれ、０〜１４であり、ｍは、それぞれ、１〜８である。一分子内に複数存在するＲ、ＴおよびＺは、それぞれ、同一であっても、異なっていてもよい。Ｔがオキシアルキレン基の場合には、炭素原子側の末端がＲに結合する。Ｒのうち少なくとも１つは、重合性基である。） The polymerizable monomer used in the present invention is further preferably a polymerizable monomer represented by the following general formulas (MO-1) to (MO-6).

(In the formula, each of n is 0 to 14 and m is 1 to 8. Each of R, T and Z present in a molecule is the same or different. When T is an oxyalkylene group, the terminal on the carbon atom side is bonded to R. At least one of R is a polymerizable group.)

上記一般式（ＭＯ−１）〜（ＭＯ−６）で表される、ラジカル重合性モノマーの具体例としては、特開２００７−２６９７７９号公報の段落番号０２４８〜段落番号０２５１に記載されている化合物を本発明においても好適に用いることができる。 n is preferably 0 to 5, and more preferably 1 to 3.
m is preferably 1 to 5, and more preferably 1 to 3.
R is

Specific examples of the radical polymerizable monomer represented by the above general formulas (MO-1) to (MO-6) include compounds described in paragraph numbers 0248 to 0251 of JP-A No. 2007-26979. Can also be suitably used in the present invention.

Especially, as a polymerizable monomer etc., the polymerizable monomer etc. of Unexamined-Japanese-Patent No. 2012-16443 Paragraph 0151 are mentioned, The content of these is integrated in this-application specification. Further, diglycerin EO (ethylene oxide) modified (meth) acrylate (commercially available product is M-460; manufactured by Toagosei Co., Ltd.). Pentaerythritol tetraacrylate (manufactured by Shin-Nakamura Chemical Co., Ltd., A-TMMT) and 1,6-hexanediol diacrylate (manufactured by Nippon Kayaku Co., Ltd., KAYARAD HDDA) are also preferable. These oligomer types can also be used.
For example, RP-1040 (made by Nippon Kayaku Co., Ltd.) etc. are mentioned.

  As a polymerizable monomer etc., it is a polyfunctional monomer, Comprising: You may have acid groups, such as a carboxyl group, a sulfonic acid group, and a phosphoric acid group. Therefore, if the ethylenic compound has an unreacted carboxyl group as in the case of a mixture as described above, this can be used as it is. The acid group may be introduced by reacting the group with a non-aromatic carboxylic acid anhydride. In this case, specific examples of the non-aromatic carboxylic acid anhydride used include tetrahydrophthalic anhydride, alkylated tetrahydrophthalic anhydride, hexahydrophthalic anhydride, alkylated hexahydrophthalic anhydride, succinic anhydride, anhydrous Maleic acid is mentioned.

In the present invention, the monomer having an acid group is an ester of an aliphatic polyhydroxy compound and an unsaturated carboxylic acid, and a non-aromatic carboxylic acid anhydride is reacted with an unreacted hydroxyl group of the aliphatic polyhydroxy compound. A polyfunctional monomer having an acid group is preferable, and in this ester, the aliphatic polyhydroxy compound is pentaerythritol and / or dipentaerythritol. Examples of commercially available products include Aronix series M-305, M-510, and M-520 as polybasic acid-modified acrylic oligomers manufactured by Toagosei Co., Ltd.
A preferable acid value of the polyfunctional monomer having an acid group is 0.1 to 40 mg-KOH / g, and particularly preferably 5 to 30 mg-KOH / g. When two or more polyfunctional monomers having different acid groups are used in combination, or when a polyfunctional monomer having no acid group is used in combination, it is essential that the acid value of the entire polyfunctional monomer is within the above range. It is.

Moreover, it is preferable to contain the polyfunctional monomer which has a caprolactone modified structure as a polymerizable monomer.
The polyfunctional monomer having a caprolactone-modified structure is not particularly limited as long as it has a caprolactone-modified structure in the molecule. For example, trimethylolethane, ditrimethylolethane, trimethylolpropane, ditrimethylolpropane , Which is obtained by esterifying a polyhydric alcohol such as pentaerythritol, dipentaerythritol, tripentaerythritol, glycerin, diglycerol, trimethylolmelamine, (meth) acrylic acid and ε-caprolactone, Mention may be made of functional (meth) acrylates. Among these, a polyfunctional monomer having a caprolactone-modified structure represented by the following formula (1) is preferable.

（式中、６個のＲは全てが下記式（２）で表される基であるか、または６個のＲのうち１〜５個が下記式（２）で表される基であり、残余が下記式（３）で表される基である。）

(In the formula, all 6 Rs are groups represented by the following formula (2), or 1 to 5 of 6 Rs are groups represented by the following formula (2), The remainder is a group represented by the following formula (3).)

（式中、Ｒ¹は水素原子またはメチル基を示し、ｍは１または２の数を示し、「＊」は結合手であることを示す。）

(In the formula, R ¹ represents a hydrogen atom or a methyl group, m represents a number of 1 or 2, and “*” represents a bond.)

（式中、Ｒ¹は水素原子またはメチル基を示し、「＊」は結合手であることを示す。）

(In the formula, R ¹ represents a hydrogen atom or a methyl group, and “*” represents a bond.)

The polyfunctional monomer having such a caprolactone-modified structure is commercially available, for example, as KAYARAD DPCA series from Nippon Kayaku Co., Ltd., and DPCA-20 (m = in the above formulas (1) to (3)) 1, the number of groups represented by formula (2) = 2, a compound in which R ¹ is all hydrogen atoms, DPCA-30 (same formula, m = 1, number of groups represented by formula (2) = 3, compound in which R ¹ is all hydrogen atoms), DPCA-60 (same formula, m = 1, number of groups represented by formula (2) = 6, compound in which R ¹ is all hydrogen atoms), DPCA -120 (a compound in which m = 2 in the formula, the number of groups represented by formula (2) = 6, and all R ¹ are hydrogen atoms).
In this invention, the polyfunctional monomer which has a caprolactone modified structure can be used individually or in mixture of 2 or more types.

  In addition, the polymerizable monomer or the like in the present invention is preferably at least one selected from the group of compounds represented by the following general formula (i) or (ii).

In the general formula (i) and (ii), E are each _{independently, - ((CH 2) yCH} 2 O) -, or _{((CH 2) y CH (} CH 3) O) - represents, y Each independently represents an integer of 0 to 10, and each X independently represents an acryloyl group, a methacryloyl group, a hydrogen atom, or a carboxyl group.
In said general formula (i), the sum total of acryloyl group and methacryloyl group is 3 or 4, m represents the integer of 0-10 each independently, and the sum total of each m is an integer of 0-40. However, when the total of each m is 0, any one of X is a carboxyl group.
In the general formula (ii), the total number of acryloyl groups and methacryloyl groups is 5 or 6, each n independently represents an integer of 0 to 10, and the total of each n is an integer of 0 to 60. However, when the total of each n is 0, any one of X is a carboxyl group.

In the general formula (i), m is preferably an integer of 0 to 6, and more preferably an integer of 0 to 4. Moreover, the integer of 2-40 is preferable, the integer of 2-16 is more preferable, and the integer of 4-8 is especially preferable as the sum total of each m.
In the general formula (ii), n is preferably an integer of 0 to 6, and more preferably an integer of 0 to 4. Further, the total of each n is preferably an integer of 3 to 60, more preferably an integer of 3 to 24, and particularly preferably an integer of 6 to 12.
In general formula (i) or formula (ii) in the _{- ((CH 2) y CH} 2 O) - or _{((CH 2) y CH (} CH 3) O) - , the oxygen atom side terminal A form bonded to X is preferred.

  The compounds represented by the general formula (i) or (ii) may be used alone or in combination of two or more. In particular, in the general formula (ii), a form in which all six Xs are acryloyl groups is preferable.

  The compound represented by the general formula (i) or (ii) is a ring-opening skeleton obtained by ring-opening addition reaction of ethylene oxide or propylene oxide to pentaerythritol or dipentaerythritol, which is a conventionally known process. And a step of reacting, for example, (meth) acryloyl chloride with the terminal hydroxyl group of the ring-opening skeleton to introduce a (meth) acryloyl group. Each step is a well-known step, and a person skilled in the art can easily synthesize a compound represented by the general formula (i) or (ii).

Among the compounds represented by the general formula (i) or (ii), a pentaerythritol derivative and / or a dipentaerythritol derivative is more preferable.
Specific examples include compounds represented by the following formulas (a) to (f) (hereinafter also referred to as “exemplary compounds (a) to (f)”), and among them, exemplary compounds (a) and ( b), (e) and (f) are preferred.

  Examples of commercially available products such as polymerizable monomers represented by general formulas (i) and (ii) include SR-494, which is a tetrafunctional acrylate having four ethyleneoxy chains of 7 manufactured by Sartomer, Nippon Kayaku Co., Ltd. DPCA-60, which is a hexafunctional acrylate having six pentyleneoxy chains, and TPA-330, which is a trifunctional acrylate having three isobutyleneoxy chains.

Examples of polymerizable monomers include urethane acrylates as described in JP-B-48-41708, JP-A-51-37193, JP-B-2-32293, and JP-B-2-16765, Urethane compounds having an ethylene oxide skeleton described in JP-B-58-49860, JP-B-56-17654, JP-B-62-39417, and JP-B-62-39418 are also suitable. Furthermore, as polymerizable monomers, addition polymerizable monomers having an amino structure or a sulfide structure in the molecule described in JP-A-63-277653, JP-A-63-260909, JP-A-1-105238 Can be used to obtain a curable composition having a very high photosensitive speed.
Commercially available products such as polymerizable monomers include urethane oligomers UAS-10, UAB-140 (manufactured by Sanyo Kokusaku Pulp), UA-7200 "(manufactured by Shin-Nakamura Chemical Co., Ltd., DPHA-40H (manufactured by Nippon Kayaku Co., Ltd.), UA -306H, UA-306T, UA-306I, AH-600, T-600, AI-600 (manufactured by Kyoeisha) and the like.

  A polyfunctional thiol compound having two or more mercapto (SH) groups in the same molecule is also suitable as the polymerizable monomer. Particularly preferred are those represented by the following general formula (I).

（式中、Ｒ¹はアルキル基、Ｒ²は炭素以外の原子を含んでもよいｎ価の脂肪族基、Ｒ⁰はＨではないアルキル基、ｎは２〜４を表す。）

(In the formula, R ¹ is an alkyl group, R ² is an n-valent aliphatic group that may contain atoms other than carbon, R ⁰ is an alkyl group that is not H, and n represents 2 to 4).

  If the polyfunctional thiol compound represented by the general formula (I) is specifically exemplified, 1,4-bis (3-mercaptobutyryloxy) butane [formula (II)] having the following structural formula: 1,3,5-tris (3-mercaptobutyloxyethyl) -1,3,5-triasian-2,4,6 (1H, 3H5H) -trione [formula (III)] and pentaerythritol tetrakis (3 -Mercaptobutyrate) [formula (IV)] and the like. These polyfunctional thiols can be used alone or in combination.

  In the present invention, it is also preferable to use a polymerizable monomer or oligomer having two or more epoxy groups or oxetanyl groups in the molecule as the polymerizable monomer. Specific examples of these will be described collectively in the column of the compound having an epoxy group or oxetanyl group described later.

<< B: polymer having a polymerizable group in the side chain >>
The 2nd preferable aspect of the composition of this invention is an aspect containing the polymer which has a polymeric group in a side chain as a polymeric compound.
Examples of the polymerizable group include an ethylenically unsaturated double bond group, an epoxy group, and an oxetanyl group.
The latter is described collectively in the column of the compound having an epoxy group or oxetanyl group described later.

  The polymer having an ethylenically unsaturated bond in the side chain is a high polymer having at least one selected from functional groups represented by any one of the following general formulas (1) to (3) as an unsaturated double bond moiety. Molecular compounds are preferred.

In the general formula (1), R ^{1 to} R ³ each independently represents a hydrogen atom or a monovalent organic group, and R ¹ is preferably a hydrogen atom or an alkyl which may have a substituent. A hydrogen atom and a methyl group are preferable because of high radical reactivity. R ² and R ³ are each independently a hydrogen atom, a halogen atom, an amino group, a carboxyl group, an alkoxycarbonyl group, a sulfo group, a nitro group, a cyano group, an optionally substituted alkyl group, or a substituted group. An aryl group that may have a group, an alkoxy group that may have a substituent, an aryloxy group that may have a substituent, an alkylamino group that may have a substituent, and a substituent An arylamino group which may have a substituent, an alkylsulfonyl group which may have a substituent, an arylsulfonyl group which may have a substituent, and the like. Among them, a hydrogen atom, a carboxyl group, an alkoxycarbonyl group, a substituent An alkyl group which may have a substituent and an aryl group which may have a substituent are preferable because of high radical reactivity.

X represents an oxygen atom, a sulfur atom, or N (R ¹² ) —, and R ¹² represents a hydrogen atom or a monovalent organic group. Here, examples of R ¹² include an alkyl group which may have a substituent. Among them, a hydrogen atom, a methyl group, an ethyl group, and an isopropyl group are preferable because of high radical reactivity.

  Here, examples of the substituent that can be introduced include an alkyl group, an alkenyl group, an alkynyl group, an aryl group, an alkoxy group, an aryloxy group, a halogen atom, an amino group, an alkylamino group, an arylamino group, a carboxyl group, an alkoxycarbonyl group, A sulfo group, a nitro group, a cyano group, an amide group, an alkylsulfonyl group, an arylsulfonyl group and the like can be mentioned.

In the general formula (2), R ^{4 to} R ⁸ each independently represents a hydrogen atom or a monovalent organic group, and R ^{4 to} R ⁸ are preferably a hydrogen atom, a halogen atom, an amino group, or a dialkyl. Amino group, carboxyl group, alkoxycarbonyl group, sulfo group, nitro group, cyano group, alkyl group which may have a substituent, aryl group which may have a substituent, alkoxy which may have a substituent A group, an aryloxy group which may have a substituent, an alkylamino group which may have a substituent, an arylamino group which may have a substituent, an alkylsulfonyl group which may have a substituent, Examples include an arylsulfonyl group which may have a substituent. Among them, a hydrogen atom, a carboxyl group, an alkoxycarbonyl group, an alkyl group which may have a substituent, and an aryl which may have a substituent The ru group is preferred.

Examples of the substituent that can be introduced are the same as those in the general formula (1). Y represents an oxygen atom, a sulfur atom, or N (R ¹² ) —. R ¹² has the same meaning as R ¹² in general formula (1), and preferred examples are also the same.

In the general formula (3), R ⁹ is preferably a hydrogen atom or an alkyl group which may have a substituent. Among them, a hydrogen atom or a methyl group has high radical reactivity. To preferred. R ¹⁰ and R ¹¹ are each independently a hydrogen atom, a halogen atom, an amino group, a dialkylamino group, a carboxyl group, an alkoxycarbonyl group, a sulfo group, a nitro group, a cyano group, or an alkyl group which may have a substituent. An aryl group which may have a substituent, an alkoxy group which may have a substituent, an aryloxy group which may have a substituent, an alkylamino group which may have a substituent, a substituent An arylamino group that may have, an alkylsulfonyl group that may have a substituent, an arylsulfonyl group that may have a substituent, and the like, among them, a hydrogen atom, a carboxyl group, an alkoxycarbonyl group, An alkyl group which may have a substituent and an aryl group which may have a substituent are preferable because of high radical reactivity.

Here, examples of the substituent that can be introduced are the same as those in the general formula (1). Further, Z is an oxygen atom, a sulfur atom, -N (R ¹³⁾ -, or a phenylene group which may have a substituent. Examples of R ¹³ include an alkyl group which may have a substituent. Among them, a methyl group, an ethyl group, and an isopropyl group are preferable because of high radical reactivity.

  As the polymer containing an ethylenically unsaturated bond in the side chain in the present invention, the structural unit containing the functional group represented by the general formulas (1) to (3) is contained in an amount of 20 mol% to 95 mol in one molecule. It is preferable that it is a compound containing in less than%. More preferably, it is 25-90 mol%. More preferably, it is the range of 30 mol% or more and less than 85 mol%.

  The synthesis of the polymer compound having a structural unit containing a group represented by the general formulas (1) to (3) is a synthesis method described in paragraphs [0027] to [0057] of JP-A No. 2003-262958. Can be done on the basis of Of these, the synthesis method 1) in the publication is preferred.

The polymer having an ethylenically unsaturated bond used in the present invention may further have an acid group.
The acid group in the present application has a dissociable group having a pKa of 14 or less. Specifically, for example, —COOH, —SO ₃ H, —PO ₃ H ₂ , —OSO ₃ H, —OPO ₂ H _{2, -PhOH, -SO 2 H,} -SO 2 NH 2, -SO 2 NHCO -, - SO 2 NHSO 2 - and the like,
Of these, —COOH, —SO ₃ H, and —PO ₃ H ₂ are preferable, and —COOH is more preferable.

  A polymer containing an acid group and an ethylenically unsaturated bond in the side chain can be obtained, for example, by adding an ethylenically unsaturated group-containing epoxy compound to the carboxyl group of an alkali-soluble polymer having a carboxyl group.

  As a polymer having a carboxyl group, 1) a polymer obtained by radical polymerization or ion polymerization of a monomer having a carboxyl group, and 2) radical or ion polymerization of a monomer having an acid anhydride to hydrolyze or half-esterify an acid anhydride unit. 3) Epoxy acrylate obtained by modifying an epoxy polymer with an unsaturated monocarboxylic acid and an acid anhydride.

  Specific examples of vinyl polymers having a carboxyl group include (meth) acrylic acid, 2-succinoloyloxyethyl methacrylate, 2-malenoyloxyethyl methacrylate, and methacrylic acid 2 as monomers having a carboxyl group. -Polymers obtained by homopolymerizing unsaturated carboxylic acids such as phthaloyloxyethyl, 2-hexahydrophthaloyloxyethyl methacrylate, maleic acid, fumaric acid, itaconic acid, and crotonic acid, and these unsaturated carboxylic acids as styrene , Α-methylstyrene, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, butyl (meth) acrylate, vinyl acetate, acrylonitrile, (meth) acrylamide , Glycidyl (meth) acryl , Allyl glycidyl ether, glycidyl ethyl acrylate, glycidyl crotonic acid ether, (meth) acrylic acid chloride, benzyl (meth) acrylate, hydroxyethyl (meth) acrylate, N-methylolacrylamide, N, N-dimethylacrylamide, N -A polymer copolymerized with a vinyl monomer having no carboxyl group, such as methacryloylmorpholine, N, N-dimethylaminoethyl (meth) acrylate, and N, N-dimethylaminoethylacrylamide.

  In addition, maleic anhydride is copolymerized with styrene, α-methylstyrene, etc., and the maleic anhydride unit part is half-esterified with monohydric alcohol such as methanol, ethanol, propanol, butanol, hydroxyethyl (meth) acrylate, or water. Also included are hydrolyzed polymers.

  Among the above, a polymer having a carboxyl group, in particular, a (meth) acrylic acid (co) polymer containing (meth) acrylic acid is preferable, and specific examples of these copolymers include, for example, Methyl methacrylate / methacrylic acid copolymer described in JP-A-60-208748, Methyl methacrylate / methyl acrylate / methacrylic acid copolymer described in JP-A-60-214354, JP-A-5-36581 Benzyl methacrylate / methyl methacrylate / methacrylic acid / 2-ethylhexyl acrylate copolymer described in JP-A-5-333542, methyl methacrylate / n-butyl methacrylate / 2-ethylhexyl acrylate / methacrylic acid copolymer Polymer, styrene / methyl methacrylate described in JP-A-7-261407 Methyl acrylate / methacrylic acid copolymer, methyl methacrylate / n-butyl acrylate / 2-ethylhexyl acrylate / methacrylic acid copolymer described in JP-A-10-110008, and JP-A-10-198031 Examples thereof include methyl methacrylate / n-butyl acrylate / 2-ethylhexyl acrylate / styrene / methacrylic acid copolymer.

  The polymer containing an acid group and a polymerizable group in the side chain in the present invention is a structural unit represented by any one of the following general formulas (1-1) to (3-1) as an unsaturated double bond moiety. A polymer compound having at least one selected is preferable.

In the general formulas (1-1) to (3-1), A ¹ , A ² , and A ³ each independently represent an oxygen atom, a sulfur atom, or N (R ²¹ ) —, and R ²¹ is The alkyl group which may have a substituent is represented. G ¹ , G ² , and G ³ each independently represent a divalent organic group. X and Z each independently represent an oxygen atom, a sulfur atom, or N (R ²² ) —, and R ²² represents an alkyl group which may have a substituent. Y represents an oxygen atom, a sulfur atom, a phenylene group which may have a substituent, or N (R ²³ ) —, and R ²³ represents an alkyl group which may have a substituent. R ^{1 to} R ²⁰ each independently represents a monovalent substituent.

In the general formula (1-1), R ^{1 to} R ³ each independently represents a monovalent substituent, and examples thereof include a hydrogen atom and an alkyl group which may further have a substituent. R ¹ and R ² are preferably a hydrogen atom, and R ³ is preferably a hydrogen atom or a methyl group.
R ^{4 to} R ⁶ each independently represents a monovalent substituent. Examples of R ⁴ include a hydrogen atom or an alkyl group which may further have a substituent. Among them, a hydrogen atom, a methyl group An ethyl group is preferred. R ⁵ and R ⁶ are each independently a hydrogen atom, a halogen atom, an alkoxycarbonyl group, a sulfo group, a nitro group, a cyano group, an alkyl group that may further have a substituent, or a substituent. An aryl group which may further have a substituent, an aryloxy group which may further have a substituent, an alkylsulfonyl group which may further have a substituent, and further having a substituent An arylsulfonyl group which may be substituted may be mentioned. Among them, a hydrogen atom, an alkoxycarbonyl group, an alkyl group which may further have a substituent, and an aryl group which may further have a substituent are preferable.
Here, examples of the substituent that can be introduced include a methoxycarbonyl group, an ethoxycarbonyl group, an isopropyloxycarbonyl group, a methyl group, an ethyl group, and a phenyl group.

A ¹ represents an oxygen atom, a sulfur atom, or —N (R ²¹ ) —, and X represents an oxygen atom, a sulfur atom, or N (R ²² ) —. Here, examples of R ²¹ and R ²² include an alkyl group which may have a substituent.
G ¹ represents a divalent organic group, but an alkylene group which may have a substituent is preferable. More preferably, it has an alkylene group which may have a substituent having 1 to 20 carbon atoms, a cycloalkylene group which may have a substituent having 3 to 20 carbon atoms, or a substituent having 6 to 20 carbon atoms. An aromatic group that may be present may be mentioned. Among them, a linear or branched alkylene group having 1 to 10 carbon atoms that may have a substituent, or cyclo that may have a substituent having 3 to 10 carbon atoms. An alkylene group and an aromatic group which may have a substituent having 6 to 12 carbon atoms are preferable in terms of performance such as strength and developability.
Here, a hydroxyl group is preferable as a substituent in G ¹ .

In the general formula (2-1), R ^{7 to} R ⁹ each independently represents a monovalent substituent, and examples thereof include a hydrogen atom and an alkyl group which may further have a substituent. R ⁷ and R ⁸ are preferably a hydrogen atom, and R ⁹ is preferably a hydrogen atom or a methyl group.
R ^{10 to} R ¹² each independently represents a monovalent substituent. Specific examples of the substituent include a hydrogen atom, a halogen atom, a dialkylamino group, an alkoxycarbonyl group, a sulfo group, and a nitro group. , A cyano group, an alkyl group which may further have a substituent, an aryl group which may further have a substituent, an alkoxy group which may further have a substituent, and an aryl which may further have a substituent Examples thereof include an oxy group, an alkylsulfonyl group that may further have a substituent, and an arylsulfonyl group that may further have a substituent. Among them, a hydrogen atom, an alkoxycarbonyl group, and a substituent may be further included. A good alkyl group and an aryl group which may further have a substituent are preferred.
Here, examples of the substituent that can be introduced include those exemplified in the general formula (1-1).

A ² each independently represents an oxygen atom, a sulfur atom, or —N (R ²¹ ) —, wherein R ²¹ is a hydrogen atom, an optionally substituted alkyl group, or the like. Can be mentioned.
G ² represents a divalent organic group, and an alkylene group which may have a substituent is preferable. Preferably, it has an alkylene group which may have a substituent having 1 to 20 carbon atoms, a cycloalkylene group which may have a substituent having 3 to 20 carbon atoms, and a substituent which has 6 to 20 carbon atoms. Aromatic group, etc. may be mentioned. Among them, a linear or branched alkylene group having 1 to 10 carbon atoms which may have a substituent, or a cycloalkylene which may have a substituent having 3 to 10 carbon atoms. Group, and an aromatic group which may have a substituent having 6 to 12 carbon atoms is preferable in terms of performance such as strength and developability.
Here, the substituent in G ² is preferably a hydroxyl group.

Y represents an oxygen atom, a sulfur atom, —N (R ²³ ) — or a phenylene group which may have a substituent. Here, examples of R ²³ include a hydrogen atom and an alkyl group which may have a substituent.

In the general formula (3-1), R ^{13 to} R ¹⁵ each independently represents a monovalent substituent, and examples thereof include a hydrogen atom and an alkyl group which may have a substituent. ¹³ and R ¹⁴ are preferably hydrogen atoms, and R ¹⁵ is preferably a hydrogen atom or a methyl group.
R ^{16 to} R ²⁰ each independently represents a monovalent substituent. R ^{16 to} R ²⁰ are, for example, a hydrogen atom, a halogen atom, a dialkylamino group, an alkoxycarbonyl group, a sulfo group, a nitro group, or a cyano group. , An alkyl group that may further have a substituent, an aryl group that may further have a substituent, an alkoxy group that may further have a substituent, an aryloxy group that may further have a substituent, Examples include an alkylsulfonyl group that may further have a substituent, an arylsulfonyl group that may further have a substituent, and the like. Among them, a hydrogen atom, an alkoxycarbonyl group, and an alkyl group that may further have a substituent An aryl group which may further have a substituent is preferable. Examples of the substituent that can be introduced include those listed in the general formula (1).
A ³ represents an oxygen atom, a sulfur atom, or N (R ²¹ ) —, and Z represents an oxygen atom, a sulfur atom, or N (R ²² ) —. Examples of R ²¹ and R ²² include the same as those in the general formula (1).

G ³ represents a divalent organic group, but an alkylene group which may have a substituent is preferable. Preferably, it has an alkylene group which may have a substituent having 1 to 20 carbon atoms, a cycloalkylene group which may have a substituent having 3 to 20 carbon atoms, and a substituent which has 6 to 20 carbon atoms. Aromatic group, etc. may be mentioned. Among them, a linear or branched alkylene group having 1 to 10 carbon atoms which may have a substituent, or a cycloalkylene which may have a substituent having 3 to 10 carbon atoms. Group, and an aromatic group which may have a substituent having 6 to 12 carbon atoms is preferable in terms of performance such as strength and developability.
Here, the substituent in G ³ is preferably a hydroxyl group.

  As preferable examples of the structural unit having an ethylenically unsaturated bond and an acid group, the description in paragraphs 0060 to 0063 of JP2009-265518A can be referred to, and the contents thereof are incorporated in the present specification.

  The polymer containing an acid group and an ethylenically unsaturated bond in the side chain in the present invention has an acid value in the range of 20 to 300 mgKOH / g, preferably 40 to 200 mgKOH / g, more preferably 60 to 150 mgKOH / g. Is preferred.

The polymer having a polymerizable group in the side chain used in the present invention is also preferably a polymer having an ethylenically unsaturated bond and a urethane group in the side chain (hereinafter sometimes referred to as “urethane polymer”).
The urethane polymer has a structural unit represented by a reaction product of at least one diisocyanate compound represented by the following general formula (4) and at least one diol compound represented by the general formula (5). A polyurethane polymer having a basic skeleton (hereinafter referred to as “specific polyurethane polymer” as appropriate).

OCN-X ⁰ -NCO General formula (4)
HO—Y ⁰ —OH Formula (5)

In general formulas (4) and (5), X ⁰ and Y ⁰ each independently represent a divalent organic residue.

  General formulas (1) to (3) in which at least one of the diisocyanate compound represented by the general formula (4) and the diol compound represented by the general formula (5) represents the unsaturated double bond moiety. Group represented by the general formulas (1) to (3) in the side chain as a reaction product of the diisocyanate compound and the diol compound. A specific polyurethane polymer in which is introduced is produced. According to this method, the specific polyurethane polymer according to the present invention can be produced more easily than the substitution and introduction of a desired side chain after the reaction of the polyurethane polymer.

1) Diisocyanate compound The diisocyanate compound represented by the above general formula (4) is obtained, for example, by subjecting a triisocyanate compound and 1 equivalent of a monofunctional alcohol or monofunctional amine compound having an unsaturated group to an addition reaction. There are products that are produced.
As the triisocyanate compound, for example, compounds described in JP2009-265518A paragraphs 00099 to 0105 can be referred to, and the contents thereof are incorporated in the present specification.
Here, as a method for introducing an unsaturated group into the side chain of the polyurethane polymer, a method using a diisocyanate compound containing an unsaturated group in the side chain as a raw material for producing the polyurethane polymer is suitable. Examples of a diisocyanate compound obtained by addition reaction of a triisocyanate compound with one equivalent of a monofunctional alcohol having a unsaturated group or a monofunctional amine compound having an unsaturated group in the side chain include, for example, JP-A-2009-265518, paragraphs 0107 to 0114 and the like can be referred to, and the contents thereof are incorporated in the present specification.
The specific polyurethane polymer used in the present invention includes, for example, the above-mentioned diisocyanate compound containing an unsaturated group from the viewpoint of improving compatibility with other components in the polymerizable composition and improving storage stability. Other diisocyanate compounds can be copolymerized.

Examples of the diisocyanate compound to be copolymerized include the following. Preferred is a diisocyanate compound represented by the following general formula (6).
OCN-L ¹ -NCO the general formula (6)
In the general formula (6), L ¹ represents a divalent aliphatic or aromatic hydrocarbon group. If necessary, L ¹ may have another functional group that does not react with an isocyanate group, such as an ester, urethane, amide, or ureido group.
Specific examples of the diisocyanate compound represented by the general formula (6) include those shown below.
That is, 2,4-tolylene diisocyanate, dimer of 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, p-xylylene diisocyanate, m-xylylene diisocyanate, 4,4′-diphenylmethane diisocyanate Aromatic diisocyanate compounds such as 1,5-naphthylene diisocyanate, 3,3′-dimethylbiphenyl-4,4′-diisocyanate;
Aliphatic diisocyanate compounds such as hexamethylene diisocyanate, trimethylhexamethylene diisocyanate, lysine diisocyanate, dimer acid diisocyanate and the like;
Alicyclic diisocyanate compounds such as isophorone diisocyanate, 4,4′-methylenebis (cyclohexyl isocyanate), methylcyclohexane-2,4 (or 2,6) diisocyanate, 1,3- (isocyanatomethyl) cyclohexane;
And a diisocyanate compound which is a reaction product of a diol and a diisocyanate such as an adduct of 1 mol of 1,3-butylene glycol and 2 mol of tolylene diisocyanate.

2) Diol Compound As the diol compound represented by the general formula (5), a polyether diol compound, a polyester diol compound, a polycarbonate diol compound, and the like are widely used.
Here, as a method for introducing an unsaturated group into the side chain of the polyurethane polymer, in addition to the above-described method, a method using a diol compound containing an unsaturated group in the side chain as a raw material for producing the polyurethane polymer is also suitable. is there. Such a diol compound may be a commercially available one such as trimethylolpropane monoallyl ether, a halogenated diol compound, a triol compound, an aminodiol compound, a carboxylic acid containing an unsaturated group, and an acid. It may be a compound that is easily produced by a reaction with a chloride, isocyanate, alcohol, amine, thiol, or alkyl halide compound. As specific examples of these compounds, compounds described in paragraphs 0122 to 0125 of JP2009-265518A can be referred to, and the contents thereof are incorporated in the present specification.

  Further, as a more preferred polymer in the present invention, a polyurethane obtained by using a diol compound represented by the following general formula (G) as at least one diol compound having an ethylenically unsaturated bond group in the synthesis of polyurethane. You can list trees.

In the general formula (G), R ^{1 to} R ³ each independently represents a hydrogen atom or a monovalent organic group, A represents a divalent organic residue, X represents an oxygen atom, a sulfur atom, or N (R ¹²⁾ - represents, R ¹² represents a hydrogen atom or a monovalent organic group.
Incidentally, R ¹ to R ³ and X in the general formula (G) has the same meaning as R ¹ to R ³ and X in the general formula (1), preferred embodiments versa.
By using a polyurethane polymer derived from such a diol compound, it is considered that the coating strength of the layer can be improved by suppressing the excessive molecular motion of the polymer main chain caused by the secondary alcohol having a large steric hindrance. It is done.
As specific examples of the diol compound represented by the general formula (G) preferably used for the synthesis of the specific polyurethane polymer, compounds described in paragraphs 0129 to 0131 of JP2009-265518A can be referred to. Is incorporated herein.

The specific polyurethane polymer used in the present invention is, for example, the above-mentioned diol compound containing an unsaturated group from the viewpoint of improving compatibility with other components in the polymerizable composition and improving storage stability. Diol compounds other than can be copolymerized.
Examples of such diol compounds include the polyether diol compounds, polyester diol compounds, and polycarbonate diol compounds described above.

  Examples of the polyether diol compound include compounds represented by the following formulas (7), (8), (9), (10) and (11), and random copolymerization of ethylene oxide and propylene oxide having a hydroxyl group at the terminal. Coalescence is mentioned.

In formulas (7) to (11), R ¹⁴ represents a hydrogen atom or a methyl group, and X ¹ represents the following group. Moreover, a, b, c, d, e, f, and g each represent an integer of 2 or more, and preferably an integer of 2 to 100.

  As the polyether diol compounds represented by the above formulas (7) to (11), specifically, compounds described in paragraphs 0137 to 0140 of JP2009-265518A can be referred to, and the contents thereof are described in the present specification. Incorporated into.

Specific examples of the random copolymer of ethylene oxide and propylene oxide having a hydroxyl group at the terminal include the following.
That is, Sanyo Chemical Industries, Ltd. (trade name) New Pole 50HB-100, New Pole 50HB-260, New Pole 50HB-400, New Pole 50HB-660, New Pole 50HB-2000, New Pole 50HB-5100, etc. It is.

  Examples of the polyester diol compound include compounds represented by formulas (12) and (13).

In formulas (12) and (13), L ² , L ³ and L ⁴ may be the same or different and each represents a divalent aliphatic or aromatic hydrocarbon group, and L ⁵ represents a divalent aliphatic carbonization. Represents a hydrogen group. Preferably, L ^{2 to} L ⁴ each represent an alkylene group, an alkenylene group, an alkynylene group, or an arylene group, and L ⁵ represents an alkylene group. In addition, other functional groups that do not react with the isocyanate group, such as ether, carbonyl, ester, cyano, olefin, urethane, amide, ureido group or halogen atom may be present in L ^{2 to} L ⁵ . n1 and n2 are each an integer of 2 or more, preferably an integer of 2 to 100.
As the polycarbonate diol compound, there is a compound represented by the formula (14).

In the formula (14), L ⁶ may be the same or different and each represents a divalent aliphatic or aromatic hydrocarbon group. Preferably, L ⁶ represents an alkylene group, an alkenylene group, an alkynylene group or an arylene group. In addition, other functional groups that do not react with the isocyanate group, such as ether, carbonyl, ester, cyano, olefin, urethane, amide, ureido group or halogen atom may be present in L ⁶ . n3 is an integer of 2 or more, and preferably represents an integer of 2 to 100.

  As specific diol compounds represented by the above formula (12), (13) or (14), compounds described in paragraphs 0148 to 0150 of JP2009-265518A can be referred to, and the contents thereof are described in this application. Incorporated in the description.

  Moreover, in the synthesis | combination of a specific polyurethane polymer, the diol compound which has a substituent which does not react with an isocyanate group other than the said diol compound can also be used together. Examples of such diol compounds include those shown below.

^{HO-L 7 -O-CO-} L 8 -CO-O-L 7 -OH (15)
^{HO-L 8 -CO-O-} L 7 -OH (16)

In the formulas (15) and (16), L ⁷ and L ⁸ may be the same or different, and each may have a substituent (for example, an alkyl group, an aralkyl group, an aryl group, an alkoxy group, an aryloxy group, —F, — And a divalent aliphatic hydrocarbon group, an aromatic hydrocarbon group or a heterocyclic group, which may have a halogen atom such as Cl, -Br, and -I. If necessary, L ⁷ and L ⁸ may have another functional group that does not react with an isocyanate group, such as a carbonyl group, an ester group, a urethane group, an amide group, or a ureido group. Note that L ⁷ and L ⁸ may form a ring.

Furthermore, in the synthesis of the specific polyurethane polymer, a diol compound having a carboxyl group can be used in combination with the diol compound.
Examples of such diol compounds include those represented by the following formulas (17) to (19).

In the formulas (17) to (19), R ¹⁵ is a hydrogen atom, a substituent (for example, a halogen atom such as a cyano group, a nitro group, —F, —Cl, —Br, —I, etc.), —CONH ₂ , —COOR ^16. , -OR ¹⁶ , -NHCONHR ¹⁶ , -NHCONOR ¹⁶ , -NHCOR ¹⁶ , -OCONHR ¹⁶ (wherein R ¹⁶ represents an alkyl group having 1 to 10 carbon atoms and an aralkyl group having 7 to 15 carbon atoms). Represents an alkyl group, an aralkyl group, an aryl group, an alkoxy group, or an aryloxy group, which may have a hydrogen atom, an alkyl group having 1 to 8 carbon atoms, or 6 to 6 carbon atoms. Represents 15 aryl groups. L ⁹ , L ¹⁰ and L ¹¹ may be the same or different from each other, and may have a single bond or a substituent (for example, alkyl, aralkyl, aryl, alkoxy and halogeno groups are preferred). Represents a divalent aliphatic or aromatic hydrocarbon group, preferably an alkylene group having 1 to 20 carbon atoms, an arylene group having 6 to 15 carbon atoms, more preferably an alkylene group having 1 to 8 carbon atoms. . If necessary, L ^{9 to} L ¹¹ may have other functional groups that do not react with isocyanate groups, such as carbonyl, ester, urethane, amide, ureido, and ether groups. A ring may be formed by 2 or 3 of R ¹⁵ , L ⁷ , L ⁸ and L ⁹ .
Ar represents a trivalent aromatic hydrocarbon group, preferably an aromatic group having 6 to 15 carbon atoms.

Specific examples of the diol compound having a carboxyl group represented by the above formulas (17) to (19) include those shown below.
3,5-dihydroxybenzoic acid, 2,2-bis (hydroxymethyl) propionic acid, 2,2-bis (2-hydroxyethyl) propionic acid, 2,2-bis (3-hydroxypropyl) propionic acid, Bis (hydroxymethyl) acetic acid, bis (4-hydroxyphenyl) acetic acid, 2,2-bis (hydroxymethyl) butyric acid, 4,4-bis (4-hydroxyphenyl) pentanoic acid, tartaric acid, N, N-dihydroxyethylglycine N, N-bis (2-hydroxyethyl) -3-carboxy-propionamide and the like.

  The presence of such a carboxyl group is preferable because the polyurethane polymer can be provided with properties such as hydrogen bonding properties and alkali solubility. More specifically, the polyurethane polymer having an ethylenically unsaturated bond group in the side chain is a polymer further having a carboxyl group in the side chain, and more specifically, an ethylenically unsaturated bond group in the side chain. A polyurethane polymer having 0.3 meq / g or more and having a carboxyl group in the side chain of 0.4 meq / g or more is particularly preferably used as the binder polymer of the present invention.

  In addition to the diol, a compound obtained by ring-opening a tetracarboxylic dianhydride represented by the following formulas (20) to (22) with a diol compound may be used in combination with the synthesis of the specific polyurethane polymer. it can.

In formulas (20) to (22), L ¹² may have a single bond or a substituent (for example, alkyl, aralkyl, aryl, alkoxy, halogeno, ester or amide groups are preferred). Represents an aliphatic or aromatic hydrocarbon group, —CO—, —SO—, —SO ₂ —, —O— or S—, preferably a single bond and a divalent aliphatic carbon having 1 to 15 carbon atoms. hydrogen _{group, -CO -, - SO 2 -} , - represents O- or S- to. R ¹⁷ and R ¹⁸ may be the same or different and each represents a hydrogen atom, an alkyl group, an aralkyl group, an aryl group, an alkoxy group, or a halogeno group, preferably a hydrogen atom or an alkyl having 1 to 8 carbon atoms. Group, an aryl group having 6 to 15 carbon atoms, an alkoxy group having 1 to 8 carbon atoms or a halogeno group. Two of L ¹² , R ¹⁷ and R ¹⁸ may be bonded to form a ring.

R ¹⁹ and R ²⁰ may be the same or different and each represents a hydrogen atom, an alkyl group, an aralkyl group, an aryl group or a halogeno group, preferably a hydrogen atom, an alkyl having 1 to 8 carbon atoms, or a carbon number of 6 Represents ~ 15 aryl groups. Two of L ¹² , R ¹⁹ and R ²⁰ may be bonded to form a ring. L ¹³ and L ¹⁴ may be the same or different and each represents a single bond, a double bond or a divalent aliphatic hydrocarbon group, preferably a single bond, a double bond or a methylene group. A represents a mononuclear or polynuclear aromatic ring. Preferably, it represents an aromatic ring having 6 to 18 carbon atoms.

  As the compound represented by the above formula (20), (21) or (22), the description in paragraphs 0163 to 0164 of JP2009-265518A can be specifically referred to, and the contents thereof are described in the present specification. Incorporated into.

Examples of a method for introducing a compound obtained by ring-opening these tetracarboxylic dianhydrides with a diol compound into a polyurethane polymer include the following methods.
a) A method of reacting an alcohol-terminated compound obtained by ring-opening tetracarboxylic dianhydride with a diol compound and a diisocyanate compound.
b) A method of reacting an alcohol-terminated urethane compound obtained by reacting a diisocyanate compound under an excess of a diol compound with tetracarboxylic dianhydride.

  In addition, as the diol compound used for the ring-opening reaction at this time, the description in paragraph 0166 of JP2009-265518A can be specifically referred to, and the contents thereof are incorporated in the present specification.

The specific polyurethane polymer that can be used in the present invention is synthesized by adding the above-mentioned diisocyanate compound and diol compound to an aprotic solvent and adding a known catalyst having an activity corresponding to the reactivity thereof, followed by heating. The molar ratio (M _a : M _b ) of the diisocyanate and diol compound used in the synthesis is preferably 1: 1 to 1.2: 1, and the molecular weight or viscosity is desired by treating with alcohols or amines. The product having the physical properties is finally synthesized in a form in which no isocyanate group remains.

  As an introduction amount of the ethylenically unsaturated bond contained in the specific polyurethane polymer according to the present invention, in terms of equivalent, 0.3 meq / g or more of an ethylenically unsaturated bond group in the side chain, and further 0.35 to It is preferable to contain 1.50 meq / g.

  The molecular weight of the specific polyurethane polymer according to the present invention is preferably 10,000 or more in terms of weight average molecular weight, and more preferably in the range of 40,000 to 200,000.

  In the present invention, a styrene polymer having an ethylenically unsaturated bond in the side chain (hereinafter sometimes referred to as “styrene polymer”) is also preferable, and a styrenic double bond (styrene) represented by the following general formula (23): And α-methylstyrene double bonds) and those having at least one of vinylpyridinium groups represented by the following general formula (24) are more preferable.

In the general formula (23), R ²¹ represents a hydrogen atom or a methyl group. R ²² represents any substitutable atom or atomic group. k represents an integer of 0 to 4.
In addition, the styrenic double bond represented by the general formula (23) is connected to the polymer main chain through a single bond or a connecting group consisting of an arbitrary atom or atomic group, and the way of bonding is particularly There is no limit.
JP-A-2009-265518, paragraphs 0179 to 0181 can be referred to for preferable examples of the repeating unit of the polymer compound having the functional group represented by the general formula (23). Embedded in.

In the general formula (24), R ²³ represents a hydrogen atom or a methyl group. R ²⁴ represents any substitutable atom or atomic group. m represents an integer of 0 to 4. A ⁻ represents an anion. Further, the pyridinium ring may take the form of benzopyridinium fused with a benzene ring as a substituent, and in this case includes a quinolium group and an isoquinolium group.
The vinylpyridinium group represented by the general formula (24) is connected to the polymer main chain through a single bond or a connecting group consisting of an arbitrary atom or atomic group, and there is no particular limitation on the way of bonding. Absent.
JP-A-2009-265518, paragraph 0184, etc. can be referred to as preferred examples of the repeating unit of the polymer compound having the functional group represented by the general formula (24), and the contents thereof are incorporated in the present specification. .

  One of the methods for synthesizing the styrenic polymer is a monomer having a functional group represented by the general formula (23) or (24) and having a functional group copolymerizable with another copolymer component. The method of copolymerizing each other using a well-known copolymerization method is mentioned. Here, the styrenic polymer may be a homopolymer having only one of the functional groups represented by the general formulas (23) and (24), either one, or A copolymer having two or more types of both functional groups may be used.

  Further, it may be a copolymer with other copolymerization monomers not containing these functional groups. As another copolymerization monomer in this case, it is preferable to select a carboxy group-containing monomer, for example, for the purpose of imparting solubility to an aqueous alkaline solution to the polymer. Acrylic acid, methacrylic acid, acrylic acid 2-carboxyethyl ester Examples thereof include 2-carboxyethyl methacrylate, crotonic acid, maleic acid, fumaric acid, maleic acid monoalkyl ester, fumaric acid monoalkyl ester, 4-carboxystyrene and the like.

  In addition to the monomer having a carboxy group, other monomer components may be introduced into the copolymer to be synthesized and used as a (multi-component) copolymer. In such a case, as a monomer that can be incorporated into the copolymer, the description in paragraph 0187 of JP2009-265518A can be referred to, and the contents thereof are incorporated in the present specification.

  When using the above-mentioned copolymer as the styrenic polymer, the proportion of the repeating unit having the functional group represented by the general formula (23) and / or the general formula (24) in the entire copolymer composition Is preferably 20% by mass or more, and more preferably 40% by mass or more. Within this range, the effect of the present invention is excellent and a highly sensitive crosslinking system is provided.

  The molecular weight of the styrenic polymer is preferably in the range of 10,000 to 300,000 in terms of weight average molecular weight, more preferably in the range of 15,000 to 200,000, and most preferably in the range of 20000 to 150,000.

As other polymers having an ethylenically unsaturated bond in the side chain, as novolak polymers having an ethylenically unsaturated group in the side chain, for example, the polymers described in JP-A-9-269596, Examples thereof include a polymer in which an ethylenically unsaturated bond is introduced into a side chain using the method described in Japanese Patent No. 62648.
Moreover, as an acetal polymer which has an ethylenically unsaturated bond in a side chain, the polymer etc. which are described in Unexamined-Japanese-Patent No. 2002-162741 are mentioned, for example.
Furthermore, as the polyamide-based polymer having an ethylenically unsaturated bond in the side chain, for example, the polymer described in Japanese Patent Application No. 2003-321022 or the polyamide polymer cited therein is disclosed in JP-A-2002-62648. Examples thereof include a polymer having an ethylenically unsaturated bond introduced into the side chain by the described method.
Examples of the polyimide polymer having an ethylenically unsaturated bond in the side chain include, for example, a polymer described in Japanese Patent Application No. 2003-339785, or a polyimide polymer cited therein, and a method described in JP-A-2002-62648. And polymers having an ethylenically unsaturated bond introduced in the side chain.

<< C: Compound having epoxy group or oxetanyl group >>
The 3rd preferable aspect of this invention is an aspect containing the compound which has an epoxy group or an oxetanyl group as a polymeric compound. Specific examples of the compound having an epoxy group or oxetanyl group include a polymer having an epoxy group in the side chain, and a polymerizable monomer or oligomer having two or more epoxy groups in the molecule, and a bisphenol A type epoxy resin, Bisphenol F type epoxy resin, phenol novolac type epoxy resin, cresol novolac type epoxy resin, aliphatic epoxy resin and the like can be mentioned.
These compounds may be used as commercial products or can be obtained by introducing an epoxy group into the side chain of the polymer.

As a commercial item, description of Unexamined-Japanese-Patent No. 2012-155288 Paragraph 0191 etc. can be considered, and these content is integrated in this-application specification.
Moreover, as a commercial item, Denacol EX-212L, EX-214L, EX-216L, EX-321L, EX-850L (above, Nagase ChemteX Co., Ltd. product) etc. are mentioned. In addition, ADEKA RESIN EP-4000S, EP-4003S, EP-4010S, EP-4010S, EP-4011S (above, manufactured by ADEKA Corporation), NC-2000, NC-3000, NC-7300, XD-1000, EPPN-501, EPPN-502 (above, manufactured by ADEKA Corporation), JER1031S, and the like are also included.
Furthermore, JER-157S65, JER-152, JER-154, JER-157S70, (Mitsubishi Chemical Corporation make) etc. are mentioned as a commercial item of a phenol novolak type epoxy resin.

  Specific examples of the polymer having an oxetanyl group in the side chain and the polymerizable monomer or oligomer having two or more oxetanyl groups in the molecule include Aronoxetane OXT-121, OXT-221, OX-SQ, PNOX ( As described above, Toagosei Co., Ltd.) can be used.

In the case of synthesizing by introducing into a polymer side chain, for example, the introduction reaction includes tertiary amines such as triethylamine and benzylmethylamine, quaternary ammonium salts such as dodecyltrimethylammonium chloride, tetramethylammonium chloride, tetraethylammonium chloride, pyridine, The reaction can be carried out in an organic solvent at a reaction temperature of 50 to 150 ° C. for several to several tens of hours using triphenylphosphine or the like as a catalyst. The introduction amount of the alicyclic epoxy unsaturated compound is preferably controlled so that the acid value of the obtained polymer is in a range satisfying 5 to 200 KOH · mg / g. Further, the molecular weight is preferably 500 to 5000000, more preferably 1000 to 500000 in terms of weight average.
As the epoxy unsaturated compound, those having a glycidyl group as an epoxy group such as glycidyl (meth) acrylate and allyl glycidyl ether can be used, but preferred are unsaturated compounds having an alicyclic epoxy group. As such a thing, description of Unexamined-Japanese-Patent No. 2009-265518 Paragraph 0045 etc. can be considered, and these content is integrated in this-application specification.

  About these polymeric compounds, the details of usage methods, such as the structure, single use or combined use, and addition amount, can be arbitrarily set according to the final performance design of a near-infrared absorptive composition. For example, from the viewpoint of sensitivity, a structure having a high unsaturated group content per molecule is preferable, and in many cases, a bifunctional or higher functionality is preferable. In addition, from the viewpoint of increasing the strength of the near infrared cut filter, those having three or more functionalities are preferable. Further, different functional numbers / different polymerizable groups (for example, acrylic acid esters, methacrylic acid esters, styrene compounds, vinyl ether compounds). A method of adjusting both sensitivity and intensity by using a combination of these materials is also effective. In addition, selection and use of polymerizable compounds are important for compatibility and dispersibility with other components (eg, metal oxides, dyes, polymerization initiators) contained in the near-infrared absorbing composition. For example, the compatibility may be improved by using a low-purity compound or using two or more kinds in combination. In addition, a specific structure may be selected from the viewpoint of improving adhesion to a hard surface such as a support.

The addition amount of the polymerizable compound in the composition of the present invention is 1 to 80% by mass, more preferably 5 to 50% by mass, and particularly preferably 7 to 30% by mass with respect to the total solid content excluding the solvent. Is preferably added.
Only one type of polymerizable compound or two or more types may be used, and in the case of two or more types, the total amount falls within the above range.

<Binder polymer>
In the present invention, a binder polymer can be further contained in addition to the polymerizable compound as necessary for the purpose of improving the film properties. As the binder polymer, an alkali-soluble resin is preferably used. By containing an alkali-soluble resin, there is an effect in improving heat resistance and fine adjustment of coating properness.

The alkali-soluble resin is a linear organic polymer, and promotes at least one alkali-solubility in a molecule (preferably a molecule having an acrylic copolymer or a styrene copolymer as a main chain). It can be suitably selected from alkali-soluble resins having a group. From the viewpoint of heat resistance, polyhydroxystyrene resins, polysiloxane resins, acrylic resins, acrylamide resins, and acryl / acrylamide copolymer resins are preferable. From the viewpoint of development control, acrylic resins and acrylamide resins are preferable. Resins and acrylic / acrylamide copolymer resins are preferred.
Examples of the group that promotes alkali solubility (hereinafter also referred to as an acid group) include a carboxyl group, a phosphoric acid group, a sulfonic acid group, and a phenolic hydroxyl group. The group is soluble in an organic solvent and developed with a weak alkaline aqueous solution. Possible are preferable, and (meth) acrylic acid is particularly preferable. These acid groups may be used alone or in combination of two or more.
Examples of the monomer capable of imparting an acid group after the polymerization include a monomer having a hydroxyl group such as 2-hydroxyethyl (meth) acrylate, a monomer having an epoxy group such as glycidyl (meth) acrylate, and 2-isocyanatoethyl (meta ) Monomers having an isocyanate group such as acrylate. These monomers for introducing an acid group may be only one type or two or more types. In order to introduce an acid group into an alkali-soluble binder, for example, a monomer having an acid group and / or a monomer capable of imparting an acid group after polymerization (hereinafter sometimes referred to as “monomer for introducing an acid group”) .) May be polymerized as a monomer component. In addition, when introducing an acid group using a monomer capable of imparting an acid group after polymerization as a monomer component, for example, a treatment for imparting an acid group as described later is required after the polymerization.

  For production of the alkali-soluble resin, for example, a known radical polymerization method can be applied. Polymerization conditions such as temperature, pressure, type and amount of radical initiator, type of solvent, etc. when producing an alkali-soluble resin by radical polymerization can be easily set by those skilled in the art, and the conditions are determined experimentally. It can also be done.

  As the linear organic polymer used as the alkali-soluble resin, a polymer having a carboxylic acid in the side chain is preferable, and as such a polymer, description in paragraph 0253 of JP2012-162684A can be referred to, These contents are incorporated herein.

（式（ＥＤ）中、Ｒ¹およびＲ²は、それぞれ独立して、水素原子または炭素数１〜２５の炭化水素基を表す。）で示される化合物（以下「エーテルダイマー」と称することもある。）を必須とする単量体成分を重合してなるポリマー（ａ）を、必須成分であるポリマー成分（Ａ）として含むことも好ましい。これにより、本発明の組成物は、耐熱性とともに透明性にも極めて優れた硬化塗膜を形成しうる。前記エーテルダイマーを示す前記一般式（１）中、Ｒ¹およびＲ²で表される炭素数１〜２５の炭化水素基としては、特に制限はないが、例えば、メチル、エチル、ｎ−プロピル、イソプロピル、ｎ−ブチル、イソブチル、ｔ−ブチル、ｔ−アミル、ステアリル、ラウリル、２−エチルヘキシル等の直鎖状または分岐状のアルキル基；フェニル等のアリール基；シクロヘキシル、ｔ−ブチルシクロヘキシル、ジシクロペンタジエニル、トリシクロデカニル、イソボルニル、アダマンチル、２−メチル−２−アダマンチル等の脂環式基；１−メトキシエチル、１−エトキシエチル等のアルコキシで置換されたアルキル基；ベンジル等のアリール基で置換されたアルキル基；等が挙げられる。これらの中でも特に、メチル、エチル、シクロヘキシル、ベンジル等のような酸や熱で脱離しにくい１級または２級炭素の置換基が耐熱性の点で好ましい。 As an alkali-soluble resin, the following general formula (ED)

(In formula (ED), R ¹ and R ² each independently represents a hydrogen atom or a hydrocarbon group having 1 to 25 carbon atoms) (hereinafter sometimes referred to as “ether dimer”). It is also preferable that the polymer (a) obtained by polymerizing the monomer component having the essential component (.) Is included as the essential polymer component (A). Thereby, the composition of this invention can form the cured coating film which was very excellent also in heat resistance and transparency. In the general formula (1) showing the ether dimer, the hydrocarbon group having 1 to 25 carbon atoms represented by R ¹ and R ² is not particularly limited, and examples thereof include methyl, ethyl, n-propyl, Linear or branched alkyl groups such as isopropyl, n-butyl, isobutyl, t-butyl, t-amyl, stearyl, lauryl, 2-ethylhexyl; aryl groups such as phenyl; cyclohexyl, t-butylcyclohexyl, dicyclo Alicyclic groups such as pentadienyl, tricyclodecanyl, isobornyl, adamantyl and 2-methyl-2-adamantyl; alkyl groups substituted with alkoxy such as 1-methoxyethyl and 1-ethoxyethyl; aryl such as benzyl An alkyl group substituted with a group; and the like. Among these, an acid such as methyl, ethyl, cyclohexyl, benzyl or the like, or a primary or secondary carbon substituent which is difficult to be removed by heat is preferable from the viewpoint of heat resistance.

  As specific examples of the ether dimer, description in paragraph 0257 of JP2012-162684A can be referred to, and the contents thereof are incorporated in the present specification.

  In this invention, it is preferable that the structural unit derived from an ether dimer is 1-50 mol% of the whole, and it is more preferable that it is 1-20 mol%.

Other monomers may be copolymerized with the ether dimer.
Other monomers that can be copolymerized with the ether dimer include, for example, a monomer for introducing an acid group, a monomer for introducing a radical polymerizable double bond, and an epoxy group. Monomers and other copolymerizable monomers other than these may be mentioned. Only 1 type may be used for such a monomer and it may use 2 or more types.

Examples of the monomer for introducing an acid group include monomers having a carboxyl group such as (meth) acrylic acid and itaconic acid, monomers having a phenolic hydroxyl group such as N-hydroxyphenylmaleimide, maleic anhydride, and anhydride. And monomers having a carboxylic anhydride group such as itaconic acid. Among these, (meth) acrylic acid is particularly preferable.
The monomer for introducing an acid group may be a monomer that can give an acid group after polymerization, for example, a monomer having a hydroxyl group such as 2-hydroxyethyl (meth) acrylate, Examples thereof include a monomer having an epoxy group such as glycidyl (meth) acrylate, and a monomer having an isocyanate group such as 2-isocyanatoethyl (meth) acrylate. When using a monomer for introducing a radical polymerizable double bond, when using a monomer capable of imparting an acid group after polymerization, it is necessary to perform a treatment for imparting an acid group after polymerization. The treatment for adding an acid group after polymerization varies depending on the type of monomer, and examples thereof include the following treatment. In the case of using a monomer having a hydroxyl group, for example, a treatment of adding an acid anhydride such as succinic anhydride, tetrahydrophthalic anhydride, maleic anhydride or the like can be mentioned. In the case of using a monomer having an epoxy group, for example, a compound having an amino group and an acid group such as N-methylaminobenzoic acid or N-methylaminophenol is added, or, for example, (meth) acrylic For example, a treatment of adding an acid anhydride such as succinic acid anhydride, tetrahydrophthalic acid anhydride, maleic acid anhydride to the hydroxyl group generated after adding an acid such as an acid can be mentioned. In the case of using a monomer having an isocyanate group, for example, a treatment of adding a compound having a hydroxyl group and an acid group such as 2-hydroxybutyric acid can be mentioned.

  When the polymer formed by polymerizing the monomer component containing the compound represented by the general formula (ED) contains a monomer for introducing an acid group, the content ratio is not particularly limited, In a monomer component, 5-70 mass% is preferable, More preferably, it is 10-60 mass%.

  Examples of the monomer for introducing a radical polymerizable double bond include, for example, monomers having a carboxyl group such as (meth) acrylic acid and itaconic acid; carboxylic acid anhydrides such as maleic anhydride and itaconic anhydride Monomers having a group; monomers having an epoxy group such as glycidyl (meth) acrylate, 3,4-epoxycyclohexylmethyl (meth) acrylate, o- (or m-, or p-) vinylbenzyl glycidyl ether; . When using a monomer for introducing a radical polymerizable double bond, it is necessary to perform a treatment for imparting a radical polymerizable double bond after polymerization. The treatment for imparting a radical polymerizable double bond after polymerization differs depending on the type of monomer that can impart a radical polymerizable double bond to be used, and examples thereof include the following treatment. If a monomer having a carboxyl group such as (meth) acrylic acid or itaconic acid is used, glycidyl (meth) acrylate, 3,4-epoxycyclohexylmethyl (meth) acrylate, o- (or m-, or p- ) Treatment of adding a compound having an epoxy group such as vinylbenzyl glycidyl ether and a radically polymerizable double bond. In the case of using a monomer having a carboxylic anhydride group such as maleic anhydride or itaconic anhydride, a treatment for adding a compound having a hydroxyl group and a radical polymerizable double bond such as 2-hydroxyethyl (meth) acrylate Is mentioned. If a monomer having an epoxy group such as glycidyl (meth) acrylate, 3,4-epoxycyclohexylmethyl (meth) acrylate, o- (or m-, or p-) vinylbenzylglycidyl ether is used, (meth) The process which adds the compound which has acid groups, such as acrylic acid, and a radically polymerizable double bond is mentioned.

  When the polymer obtained by polymerizing the monomer component containing the compound represented by the general formula (ED) contains a monomer for introducing a radical polymerizable double bond, the content ratio is particularly limited. Although not, 5-70 mass% is preferable in all the monomer components, More preferably, it is 10-60 mass%.

Examples of the monomer for introducing an epoxy group include glycidyl (meth) acrylate, 3,4-epoxycyclohexylmethyl (meth) acrylate, o- (or m-, or p-) vinylbenzyl glycidyl ether, and the like. Can be mentioned.
When the polymer obtained by polymerizing the monomer component containing the compound represented by the general formula (ED) contains a monomer for introducing an epoxy group, the content ratio is not particularly limited, In a monomer component, 5-70 mass% is preferable, More preferably, it is 10-60 mass%.

  As other copolymerizable monomers, for example, description in paragraph 0328 of JP2012-046629A can be referred to, and the contents thereof are incorporated in the present specification.

  When the polymer obtained by polymerizing the monomer component containing the compound represented by the general formula (ED) contains another copolymerizable monomer, the content ratio is not particularly limited, but is 95% by mass. The following is preferable, and it is more preferable that it is 85 mass% or less.

The weight average molecular weight of the polymer obtained by polymerizing the monomer component containing the compound represented by the general formula (ED) is not particularly limited, but is formed by the viscosity of the colored radiation-sensitive composition and the composition. From the viewpoint of the heat resistance of the coating film, it is preferably 2000 to 200000, more preferably 5000 to 100000, and still more preferably 5000 to 20000.
Moreover, when the polymer formed by polymerizing the monomer component containing the compound represented by the general formula (ED) has an acid group, the acid value is preferably 30 to 500 mgKOH / g, more preferably 50. It should be ˜400 mg KOH / g.

A polymer obtained by polymerizing a monomer component containing a compound represented by the general formula (ED) can be easily obtained by polymerizing at least the above-mentioned monomer essentially containing an ether dimer. . At this time, the cyclization reaction of the ether dimer proceeds simultaneously with the polymerization to form a tetrahydropyran ring structure.
The polymerization method applied to the synthesis of the polymer obtained by polymerizing the monomer component containing the compound represented by the general formula (ED) is not particularly limited, and various conventionally known polymerization methods can be adopted. However, it is particularly preferable to use a solution polymerization method. Specifically, for example, in accordance with the method for synthesizing the polymer (a) described in JP-A-2004-300204, a polymerization product obtained by polymerizing a monomer component containing a compound represented by the general formula (ED). A coalescence can be synthesized.

  Hereinafter, although the exemplary compound of the polymer formed by superposing | polymerizing the monomer component containing the compound represented by general formula (ED) is shown, this invention is not limited to these. The composition ratio of the exemplary compounds shown below is mol%.

本発明では特に、ジメチル−２，２’−［オキシビス（メチレン）］ビス−２−プロペノエート（以下「ＤＭ」と称する）、ベンジルメタクリレート（以下「ＢｚＭＡ」と称する）、メタクリル酸メチル（以下「ＭＭＡ」と称する）、メタクリル酸（以下「ＭＡＡ」と称する）、グリシジルメタクリレート（以下「ＧＭＡ」と称する）を共重合させた重合体が好ましい。特に、ＤＭ：ＢｚＭＡ：ＭＭＡ：ＭＡＡ：ＧＭＡのモル比が５〜１５：４０〜５０：５〜１５：５〜１５：２０〜３０であることが好ましい。本発明で用いる共重合体を構成する成分の９５質量％以上がこれらの成分であることが好ましい。また、かかる重合体の重量平均分子量は９０００〜２００００であることが好ましい。

In the present invention, in particular, dimethyl-2,2 ′-[oxybis (methylene)] bis-2-propenoate (hereinafter referred to as “DM”), benzyl methacrylate (hereinafter referred to as “BzMA”), methyl methacrylate (hereinafter referred to as “MMA”). ), Methacrylic acid (hereinafter referred to as “MAA”), and glycidyl methacrylate (hereinafter referred to as “GMA”). In particular, the molar ratio of DM: BzMA: MMA: MAA: GMA is preferably 5-15: 40-50: 5-15: 5-15: 20-30. It is preferable that 95% by mass or more of the components constituting the copolymer used in the present invention is these components. Moreover, it is preferable that the weight average molecular weights of this polymer are 9000-20000.

In the present invention, an alkali-soluble phenol resin can also be preferably used. Examples of the alkali-soluble phenol resin include novolak resins and vinyl polymers.
Examples of the novolac resin include those obtained by condensing phenols and aldehydes in the presence of an acid catalyst. Examples of the phenols include phenol, cresol, ethylphenol, butylphenol, xylenol, phenylphenol, catechol, resorcinol, pyrogallol, naphthol, and bisphenol A.
Examples of the aldehydes include formaldehyde, paraformaldehyde, acetaldehyde, propionaldehyde, benzaldehyde, and the like.
The said phenols and aldehydes can be used individually or in combination of 2 or more types.

Specific examples of the novolak resin include, for example, a condensation product of metacresol, paracresol, or a mixture thereof and formalin.
The novolak resin may be adjusted in molecular weight distribution by means of fractionation or the like. Moreover, you may mix the low molecular weight component which has phenolic hydroxyl groups, such as bisphenol C and bisphenol A, with the said novolak resin.

  As the alkali-soluble resin, in particular, a benzyl (meth) acrylate / (meth) acrylic acid copolymer and a multi-component copolymer composed of benzyl (meth) acrylate / (meth) acrylic acid / other monomers are suitable. In addition, a copolymer of 2-hydroxyethyl methacrylate, a 2-hydroxypropyl (meth) acrylate / polystyrene macromonomer / benzyl methacrylate / methacrylic acid copolymer described in JP-A-7-140654, 2-hydroxy -3-phenoxypropyl acrylate / polymethyl methacrylate macromonomer / benzyl methacrylate / methacrylic acid copolymer, 2-hydroxyethyl methacrylate / polystyrene macromonomer / methyl methacrylate / methacrylic acid copolymer, 2-hydroxyethyl methacrylate / polystyrene macromonomer / Benzyl methacrylate / methacrylic acid copolymer.

The acid value of the alkali-soluble resin is preferably 30 mgKOH / g to 200 mgKOH / g, more preferably 50 mgKOH / g to 150 mgKOH / g, and most preferably 70 to 120 mgKOH / g.
Further, the weight average molecular weight (Mw) of the alkali-soluble resin is preferably 2,000 to 50,000, more preferably 5,000 to 30,000, and most preferably 7,000 to 20,000.

  The content of the binder polymer in the present invention is preferably 1 to 80% by mass, more preferably 5 to 50% by mass, and 7 to 30% by mass with respect to the total solid content of the composition. More preferably it is.

<Surfactant>
The composition of the present invention may contain a surfactant. Only one type of surfactant may be used, or two or more types may be combined. The addition amount of the surfactant is preferably 0.0001 to 2% by mass, more preferably 0.005 to 1.0% by mass, and still more preferably based on the solid content of the composition of the present invention. 0.01 to 0.1% by mass.
As the surfactant, various surfactants such as a fluorine-based surfactant, a nonionic surfactant, a cationic surfactant, an anionic surfactant, and a silicone-based surfactant can be used.

In particular, the composition of the present invention contains at least one of a fluorine-based surfactant and a silicone-based surfactant, so that liquid properties (particularly fluidity) when prepared as a coating solution are further improved. Therefore, the uniformity of the coating thickness and the liquid saving property can be further improved.
That is, when a film is formed using a coating liquid to which a composition containing at least one of a fluorosurfactant and a silicone surfactant is applied, the interfacial tension between the coated surface and the coating liquid is reduced. Thereby, the wettability to the coated surface is improved, and the coating property to the coated surface is improved. For this reason, even when a thin film of about several μm is formed with a small amount of liquid, it is effective in that it is possible to more suitably form a film having a uniform thickness with small thickness unevenness.

  3-40 mass% is suitable for the fluorine content rate in a fluorine-type surfactant, More preferably, it is 5-30 mass%, Most preferably, it is 7-25 mass%. A fluorine-based surfactant having a fluorine content within this range is effective in terms of uniformity of coating film thickness and liquid-saving properties, and has good solubility in the colored photosensitive composition.

  Examples of the fluorosurfactant include Megafac F171, F172, F173, F176, F176, F177, F141, F142, F143, F144, R30, F437, F479, F482, F554, F780, R08 (above, manufactured by DIC Corporation), Florard FC430, FC431, FC171 (above, manufactured by Sumitomo 3M Limited), Surflon S-382, S-141, S- 145, same SC-101, same SC-103, same SC-104, same SC-105, same SC1068, same SC-381, same SC-383, same S393, same KH-40 (above, manufactured by Asahi Glass Co., Ltd.) ), EFtop EF301, EF303, EF351, EF352 (above, manufactured by Gemco), PF636, PF656, F6320, PF6520, PF7002 (OMNOVA Co., Ltd.), and the like.

As the fluorosurfactant, a polymer having a fluoroaliphatic group is also preferable. A polymer having a fluoroaliphatic group has a fluoroaliphatic group, and the fluoroaliphatic group is produced by a telomerization method (also referred to as a telomer method) or an oligomerization method (also referred to as an oligomer method). Examples thereof include fluorine-based surfactants obtained from the obtained fluoroaliphatic compounds.
Here, the “telomerization method” means a method for synthesizing a compound having one or two active groups in a molecule by polymerizing a low molecular weight substance. The “oligomerization method” means a method of converting a monomer or a mixture of monomers into an oligomer.

The fluoroaliphatic group in the present invention, for example, -CF ₃ group, -C ₂ F ₅ group, -C ₃ F ₇ group, -C ₄ F ₉ groups, -C ₅ F ₁₁ group, -C ₆ F ₁₃ Group, -C ₇ F ₁₅ group, -C ₈ F ₁₇ group, C ₉ F ₁₉ group, C ₁₀ F ₂₁ group, and -C ₂ F ₅ group, -C ₃ from the viewpoint of compatibility and coatability. F ₇ group, -C ₄ F ₉ groups, -C ₅ F ₁₁ group, -C ₆ F ₁₃ group, -C ₇ F ₁₅ group, -C ₈ F ₁₇ group is preferred.

The fluoroaliphatic compound in the present invention can be synthesized by the method described in JP-A-2002-90991.
The polymer having a fluoroaliphatic group in the present invention includes a copolymer of a monomer having a fluoroaliphatic group in the present invention and (poly (oxyalkylene)) acrylate and / or (poly (oxyalkylene)) methacrylate. preferable. The copolymer may be randomly distributed or may be block copolymerized. Examples of the poly (oxyalkylene) group include a poly (oxyethylene) group, a poly (oxypropylene) group, a poly (oxybutylene) group, and the like, and a block of poly (oxyethylene, oxypropylene, and oxyethylene). It may be a unit having different chain lengths in the same chain length, such as a (linkage) group or a poly (block connection body of oxyethylene and oxypropylene) group. Furthermore, a copolymer of a monomer having a fluoroaliphatic group and (poly (oxyalkylene)) acrylate (or methacrylate) is not only a binary copolymer but also a monomer having two or more different fluoroaliphatic groups, Further, it may be a ternary or higher copolymer obtained by copolymerizing two or more different (poly (oxyalkylene)) acrylates (or methacrylates) at the same time.

Examples of the commercially available surfactant containing a polymer having a fluoroaliphatic group in the present invention include surfactants described in paragraph 0352 of JP2012-083727A, and the contents thereof are described in the present specification. Incorporated into. In addition, MegaFuck F-781 (manufactured by Dainippon Ink & Chemicals, Inc.), acrylate (or methacrylate) and (poly (oxyethylene)) acrylate (or methacrylate) and (poly (oxy) having a C ₆ F ₁₃ group Copolymer of propylene)) acrylate (or methacrylate), copolymer of acrylate (or methacrylate) having C ₈ F ₁₇ group and (poly (oxyalkylene)) acrylate (or methacrylate), C ₈ F ₁₇ group A copolymer of acrylate (or methacrylate), (poly (oxyethylene)) acrylate (or methacrylate), and (poly (oxypropylene)) acrylate (or methacrylate), and the like can be used.

  Specific examples of the nonionic surfactant include nonionic surfactants described in paragraph 0252 of JP2012-201643A, and the contents thereof are incorporated in the present specification.

  Specific examples of the cationic surfactant include the cationic surfactants described in paragraph 0253 of JP2012-201643A, and the contents thereof are incorporated in the present specification.

  Specific examples of the anionic surfactant include W004, W005, W017 (manufactured by Yusho Co., Ltd.) and the like.

  Examples of the silicone surfactant include silicone surfactants described in JP2012-173327A0210 and the like, and the contents thereof are incorporated in the present specification. Also, “Toray Silicone SF8410”, “Same SF8427”, “Same SH8400”, “ST80PA”, “ST83PA”, “ST86PA” manufactured by Toray Dow Corning Co., Ltd. “TSF-400” manufactured by Momentive Performance Materials, Inc. “TSF-401”, “TSF-410”, “TSF-4446” “KP321”, “KP323”, “KP324”, “KP340”, etc. manufactured by Shin-Etsu Silicone Co., Ltd. are also exemplified.

<Polymerization initiator>
The composition of the present invention may contain a polymerization initiator. Only one type of polymerization initiator may be used, or two or more types may be used, and in the case of two or more types, the total amount falls within the above range. 0.01-30 mass% is preferable, 0.1-20 mass% is more preferable, 0.1-15 mass% is especially preferable.
The polymerization initiator is not particularly limited as long as it has the ability to initiate polymerization of the polymerizable compound by light or heat, or both, and can be appropriately selected according to the purpose. It is preferable that When polymerization is initiated by light, those having photosensitivity to visible light from the ultraviolet region are preferred.
Moreover, when starting superposition | polymerization with a heat | fever, the polymerization initiator decomposed | disassembled at 150-250 degreeC is preferable.

The polymerization initiator that can be used in the present invention is preferably a compound having at least an aromatic group, such as an acylphosphine compound, an acetophenone compound, an α-aminoketone compound, a benzophenone compound, a benzoin ether compound, and a ketal derivative. Compounds, thioxanthone compounds, oxime compounds, hexaarylbiimidazole compounds, trihalomethyl compounds, azo compounds, organic peroxides, diazonium compounds, iodonium compounds, sulfonium compounds, azinium compounds, benzoin ether compounds, ketal derivative compounds, metallocene compounds, etc. Onium salt compounds, organoboron salt compounds, disulfone compounds, and the like.
From the viewpoint of sensitivity, oxime compounds, acetophenone compounds, α-aminoketone compounds, trihalomethyl compounds, hexaarylbiimidazole compounds, and thiol compounds are preferred.

  As the acetophenone-based compound, trihalomethyl compound, hexaarylbiimidazole compound, and oxime compound, specifically, description in paragraphs 0020 to 0023 of JP 2012-122045 A can be referred to, and the contents thereof are described in the present specification. Incorporated.

Preferably, it can also be suitably used for the cyclic oxime compounds described in JP2007-231000A and JP2007-322744A.
In addition, an oxime compound having a specific substituent described in JP-A-2007-2699779 and an oxime compound having a thioaryl group described in JP-A-2009-191061 can be used.
Specifically, as the oxime compound, a compound represented by the following formula (1) is also preferable. The N—O bond of the oxime may be an (E) oxime compound, a (Z) oxime compound, or a mixture of (E) and (Z) isomers. .

(In formula (1), R and B each independently represent a monovalent substituent, A represents a divalent organic group, and Ar represents an aryl group.)
The monovalent substituent represented by R is preferably a monovalent nonmetallic atomic group. Examples of the monovalent nonmetallic atomic group include an alkyl group, an aryl group, an acyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, a heterocyclic group, an alkylthiocarbonyl group, and an arylthiocarbonyl group. Moreover, these groups may have one or more substituents. Moreover, the substituent mentioned above may be further substituted by another substituent.
Examples of the substituent include a halogen atom, an aryloxy group, an alkoxycarbonyl group or an aryloxycarbonyl group, an acyloxy group, an acyl group, an alkyl group, and an aryl group.
As an alkyl group, a C1-C30 alkyl group is preferable. Specifically, description in paragraph 0026 of JP2012-032556A can be referred to, and the contents thereof are incorporated in the present specification.
As the aryl group, an aryl group having 6 to 30 carbon atoms is preferable. Specifically, descriptions in paragraphs 0027 and the like of JP2012-032556A can be referred to, and the contents thereof are incorporated in the present specification.
As the acyl group, an acyl group having 2 to 20 carbon atoms is preferable. Specifically, description of paragraph 0028 etc. of JP2012-032556A can be referred to, and these contents are incorporated in the present specification.
As an alkoxycarbonyl group, a C2-C20 alkoxycarbonyl group is preferable. Specifically, description in paragraph 0029 of JP2012-032556A can be referred to, and the contents thereof are incorporated in the present specification.
As the aryloxycarbonyl group, specifically, description in paragraph 0030 of JP2012-032556A can be referred to, and the contents thereof are incorporated in the present specification.
As the heterocyclic group, an aromatic or aliphatic heterocyclic ring containing a nitrogen atom, an oxygen atom, a sulfur atom or a phosphorus atom is preferable.
Specifically, the description in JP 2012-032556 A, paragraph 0031 and the like can be referred to, and the contents thereof are incorporated in the present specification.
Specific examples of the alkylthiocarbonyl group can be referred to the description in paragraph 0032 of JP2012-032556A, and the contents thereof are incorporated in the present specification.
As the arylthiocarbonyl group, the description in paragraph 0033 of JP2012-032556A can be referred to, and the contents thereof are incorporated in the present specification.

  The monovalent substituent represented by B represents an aryl group, a heterocyclic group, an arylcarbonyl group, or a heterocyclic carbonyl group. These groups may have one or more substituents. Examples of the substituent include the above-described substituents. Moreover, the substituent mentioned above may be further substituted by another substituent.

Among them, the structure shown below is particularly preferable.
In the following structure, Y, X, and n have the same meanings as Y, X, and n in formula (2) described later, and preferred examples are also the same.

Examples of the divalent organic group represented by A include an alkylene group having 1 to 12 carbon atoms, a cyclohexylene group, and an alkynylene group. These groups may have one or more substituents. Examples of the substituent include the above-described substituents. Moreover, the substituent mentioned above may be further substituted by another substituent.
Among them, A is an alkylene substituted with an unsubstituted alkylene group or an alkyl group (for example, a methyl group, an ethyl group, a tert-butyl group, or a dodecyl group) from the viewpoint of increasing sensitivity and suppressing coloration due to heating. Group, alkylene group substituted with alkenyl group (for example, vinyl group, allyl group), aryl group (for example, phenyl group, p-tolyl group, xylyl group, cumenyl group, naphthyl group, anthryl group, phenanthryl group, styryl group) An alkylene group substituted with

The aryl group represented by Ar is preferably an aryl group having 6 to 30 carbon atoms and may have a substituent. Examples of the substituent include the same substituents as those introduced into the substituted aryl group mentioned above as specific examples of the aryl group.
Among them, a substituted or unsubstituted phenyl group is preferable from the viewpoint of increasing sensitivity and suppressing coloring due to heating.

  In the formula (1), the structure of “SAr” formed by Ar and adjacent S is preferably a structure described in paragraph 0040 of JP2012-032556A. These contents are incorporated herein.

  The oxime compound is also preferably a compound represented by the following formula (2).

(In Formula (2), R and X each independently represent a monovalent substituent, A and Y each independently represent a divalent organic group, Ar represents an aryl group, and n represents 0-5. (It is an integer.)
R, A, and Ar in formula (2) have the same meanings as R, A, and Ar in formula (1), and preferred examples are also the same.

Examples of the monovalent substituent represented by X include an alkyl group, an aryl group, an alkoxy group, an aryloxy group, an acyloxy group, an acyl group, an alkoxycarbonyl group, an amino group, a heterocyclic group, and a halogen atom. These groups may have one or more substituents. Examples of the substituent include the above-described substituents. Moreover, the substituent mentioned above may be further substituted by another substituent.
Among these, X is preferably an alkyl group from the viewpoints of solvent solubility and improvement in absorption efficiency in the long wavelength region.
Moreover, n in Formula (2) represents the integer of 0-5, and the integer of 0-2 is preferable.
Examples of the divalent organic group represented by Y include the structures shown below. In the group shown below, * represents the bonding position between Y and the adjacent carbon atom in the formula (2).

  Among these, from the viewpoint of increasing sensitivity, the following structures are preferable.

  Furthermore, the oxime compound is also preferably a compound represented by the following formula (3).

  R, X, A, Ar, and n in Formula (3) have the same meanings as R, X, A, Ar, and n in Formula (2), respectively, and preferred examples are also the same.

  Hereinafter, as specific examples of oxime compounds that can be suitably used, descriptions in paragraphs 0033 of JP2012-032556A, paragraph 0033 of JP2012-122045A, and the like can be referred to, and the contents thereof are incorporated in the present specification. . (PIox-1) to (PIox-13) are shown below, but the present invention is not limited to these.

The oxime compound preferably has a maximum absorption wavelength in a wavelength region of 350 nm to 500 nm, more preferably has an absorption wavelength in a wavelength region of 360 nm to 480 nm, and has a high absorbance at 365 nm and 455 nm. Particularly preferred.
The oxime compound preferably has a molar extinction coefficient at 365 nm or 405 nm of 3,000 to 300,000, more preferably 5,000 to 300,000, more preferably 10,000 to 200, from the viewpoint of sensitivity. Is particularly preferred.
For the molar extinction coefficient of the compound, a known method can be used. Specifically, for example, 0.01 g of an ultraviolet-visible spectrophotometer (Vary Inc., Carry-5 spectrphotometer) using an ethyl acetate solvent is used. It is preferable to measure at a concentration of / L.

The photopolymerization initiator is more preferably a compound selected from the group consisting of oxime compounds, acetophenone compounds, and acylphosphine compounds. More specifically, for example, an aminoacetophenone initiator described in JP-A-10-291969, an acylphosphine oxide initiator described in Japanese Patent No. 4225898, and the oxime initiator described above, As the oxime initiator, compounds described in JP-A No. 2001-233842 can also be used.
As the acetophenone-based initiator, commercially available products IRGACURE-907, IRGACURE-369, and IRGACURE-379 (trade names: all manufactured by BASF Japan Ltd.) can be used. As the acylphosphine initiator, commercially available products such as IRGACURE-819 and DAROCUR-TPO (trade names: both manufactured by BASF Japan Ltd.) can be used.

<Other ingredients>
In the near-infrared absorbing composition of the present invention, in addition to the essential components and the preferred additives, other components may be appropriately selected according to the purpose as long as the effects of the present invention are not impaired.
Examples of other components that can be used in combination include a binder polymer, a dispersant, a sensitizer, a crosslinking agent, a curing accelerator, a filler, a thermosetting accelerator, a thermal polymerization inhibitor, and a plasticizer. Surface adhesion promoters and other auxiliaries (for example, conductive particles, fillers, antifoaming agents, flame retardants, leveling agents, release promoters, antioxidants, perfumes, surface tension modifiers, chain transfer agents Etc.) may be used in combination.
By appropriately containing these components, properties such as stability and film physical properties of the target near-infrared absorption filter can be adjusted.
These components include, for example, paragraph number 0183 of JP2012-003225A, paragraph number 0101-0102 of JP2008-250074, paragraph number 0103-0104 of JP2008-250074, The description of paragraph numbers 0107 to 0109 of 2008-250074 can be referred to, and the contents thereof are incorporated in the present specification.

    Since the composition of the present invention can be liquid, for example, a near-infrared cut filter can be easily manufactured by directly applying and drying the composition of the present invention. Insufficient manufacturing suitability can be improved.

Although the use of the near-infrared absorptive composition of this invention is not specifically limited, For the near-infrared cut filter in the light-receiving side of a solid-state image sensor board | substrate (For example, for the near-infrared cut filter with respect to a wafer level lens), a solid-state image sensor board | substrate For the near infrared cut filter on the back surface side (the side opposite to the light receiving side), and the like, and preferably for the light shielding film on the light receiving side of the solid-state imaging device substrate. In particular, it is preferable to form a coating film by directly applying the near infrared ray absorbing composition of the present invention on an image sensor for a solid-state imaging device.
The viscosity of the near-infrared absorbing composition of the present invention is preferably in the range of 1 mPa · s to 3000 mPa · s, more preferably 10 mPa · s to 2000 mPa when the infrared cut layer is formed by coating. -It is the range below s, More preferably, it is the range of 100 mPa * s or more and 1500 mPa * s or less.
The near-infrared absorbing composition of the present invention is for a near-infrared cut filter on the light-receiving side of a solid-state imaging device substrate, and when an infrared cut layer is formed by coating, from the viewpoint of thick film formability and uniform coatability, It is preferably in the range of 10 mPa · s to 3000 mPa · s, more preferably in the range of 500 mPa · s to 1500 mPa · s, and most preferably in the range of 700 mPa · s to 1400 mPa · s.

The present invention also relates to a laminate having a near-infrared cut layer obtained by curing the near-infrared absorbing composition and a dielectric multilayer film. Preferred embodiments of the laminate of the present invention include (i) an embodiment in which a transparent support, a near-infrared cut layer, and a dielectric multilayer film are provided in this order, (ii) a near-infrared cut layer, a transparent support, and a dielectric multilayer There is an embodiment in which films are provided in this order. The transparent support may be a glass substrate or a transparent resin substrate.
The dielectric multilayer film is a film having an ability to reflect and / or absorb near infrared rays.

As a material of the dielectric multilayer film, for example, ceramic can be used. In order to form a near-infrared cut filter using the effect of light interference, it is preferable to use two or more ceramics having different refractive indexes.
Alternatively, it is also preferable to use a noble metal film having absorption in the near infrared region in consideration of the thickness and the number of layers so as not to affect the visible light transmittance of the near infrared cut filter.
Specifically, a configuration in which high refractive index material layers and low refractive index material layers are alternately stacked can be suitably used as the dielectric multilayer film.
As a material constituting the high refractive index material layer, a material having a refractive index of 1.7 or more can be used, and a material having a refractive index range of 1.7 to 2.5 is usually selected.
As this material, for example, titanium oxide (titania), zirconium oxide, tantalum pentoxide, niobium pentoxide, lanthanum oxide, yttrium oxide, zinc oxide, zinc sulfide, indium oxide, titanium oxide mainly composed of these oxides, Examples thereof include those containing a small amount of tin oxide and / or cerium oxide. Among these, titanium oxide (titania) is preferable.
As a material constituting the low refractive index material layer, a material having a refractive index of 1.6 or less can be used, and a material having a refractive index range of 1.2 to 1.6 is usually selected.
Examples of this material include silica, alumina, lanthanum fluoride, magnesium fluoride, and sodium aluminum hexafluoride. Among these, silica is preferable.
The thicknesses of the high refractive index material layer and the low refractive index material layer are generally 0.1λ to 0.5λ of the infrared wavelength λ (nm) to be blocked. When the thickness is out of the above range, the product (n × d) of the refractive index (n) and the film thickness (d) is significantly different from the optical film thickness calculated by λ / 4, and the optical characteristics of reflection and refraction are different. The relationship is broken, and it tends to be difficult to control blocking / transmission of a specific wavelength.
The number of laminated layers in the dielectric multilayer film is preferably 5 to 50 layers, more preferably 10 to 45 layers.

A method for forming the dielectric multilayer film is not particularly limited. For example, a dielectric multilayer film in which high-refractive index material layers and low-refractive index material layers are alternately stacked by a CVD method, a sputtering method, a vacuum deposition method, or the like. A high refractive index material layer and a low refractive index material layer are alternately formed by a method in which a film is formed and bonded to the film with an adhesive, or directly on the film by a CVD method, a sputtering method, a vacuum deposition method, or the like. And a method of forming a dielectric multilayer film laminated on the substrate.
In addition, if the substrate is warped when the dielectric multilayer film is deposited, in order to eliminate this, the dielectric multilayer film is deposited on both sides of the substrate. A method of irradiating with radiation such as ultraviolet rays can be taken. In addition, when irradiating a radiation, you may irradiate while performing the vapor deposition of a dielectric multilayer, and you may irradiate separately after vapor deposition.

The present invention also relates to a near-infrared cut filter obtained using the above-described near-infrared absorbing composition of the present invention and a near-infrared cut filter having the laminate. Since such a near-infrared cut filter is formed from the near-infrared absorbing composition of the present invention, it has a high light-shielding property (near-infrared shielding property) in the near-infrared region, and translucency (visible) in the visible-light region. It is a near-infrared cut filter having a high light transmittance) and excellent weather resistance such as light resistance and moisture resistance. In particular, the present invention is useful as a near-infrared cut filter having a wavelength region of 700 to 2500 nm.
The present invention also includes a transparent support, a near infrared cut layer obtained by curing a near infrared absorbing composition containing a copper complex having a maximum absorption wavelength in the near infrared absorption region, and a dielectric multilayer film. Also related to near-infrared cut filter. The copper complex having the maximum absorption wavelength in the near infrared absorption region is synonymous with the copper complex used in the near infrared absorbing composition of the present invention, and the preferred range is also synonymous.

  Furthermore, the present invention provides a process for forming a film by applying (preferably coating or printing, more preferably spin coating or screen printing) the near-infrared absorbing composition of the present invention on the light-receiving side of the solid-state imaging device substrate. The present invention also relates to a method for manufacturing a near-infrared cut filter.

  In order to form a near-infrared cut filter, first, a film is formed from the near-infrared absorbing composition of the present invention. If a film | membrane is a film | membrane formed including the said near-infrared absorptive composition, there will be no restriction | limiting in particular, About a film thickness, a laminated structure, etc., it can select suitably according to the objective.

  As the method for forming the film, the near-infrared absorbing composition of the present invention (coating solution in which the solid content in the composition is dissolved, emulsified or dispersed) is directly applied on the support (preferably coated). And a method of forming by drying.

The support may be a transparent substrate made of glass or the like, a solid-state image sensor substrate, or another substrate (for example, a glass substrate 30 described later) provided on the light-receiving side of the solid-state image sensor substrate. Alternatively, a layer such as a flattening layer provided on the light receiving side of the solid-state imaging device substrate may be used.
The method of applying the near-infrared absorbing composition (coating liquid) on the support can be carried out by using, for example, a spin coater, a slit spin coater, a slit coater, screen printing, applicator application, or the like.
In addition, the drying conditions of the coating film vary depending on each component, the type of solvent, the use ratio, and the like, but are usually about 60 seconds to 150 ° C. for about 30 seconds to 15 minutes.

  There is no restriction | limiting in particular as thickness of the said film | membrane, Although it can select suitably according to the objective, For example, 1 micrometer-500 micrometers are preferable, 1 micrometer-300 micrometers are more preferable, and 1 micrometer-200 micrometers are especially preferable.

  The method for forming a near-infrared cut filter using the near-infrared absorbing composition of the present invention may include other steps.

  There is no restriction | limiting in particular as said other process, According to the objective, it can select suitably, For example, the surface treatment process of a base material, a preheating process (prebaking process), a hardening process process, a post-heating process (post-baking) Process).

<Pre-heating process / Post-heating process>
The heating temperature in the preheating step and the postheating step is usually 80 ° C to 200 ° C, and preferably 90 ° C to 150 ° C.
The heating time in the preheating step and the postheating step is usually 30 seconds to 240 seconds, and preferably 60 seconds to 180 seconds.

<Curing process>
The curing process is a process of curing the formed film as necessary, and the mechanical strength of the near-infrared cut filter is improved by performing this process.
There is no restriction | limiting in particular as said hardening process, Although it can select suitably according to the objective, For example, a whole surface exposure process, a whole surface heat processing, etc. are mentioned suitably. Here, in the present invention, “exposure” is used to include not only light of various wavelengths but also irradiation of radiation such as electron beams and X-rays.
The exposure is preferably performed by irradiation of radiation, and as the radiation that can be used for the exposure, ultraviolet rays such as electron beams, KrF, ArF, g rays, h rays, i rays and visible light are particularly preferably used. Preferably, KrF, g line, h line, and i line are preferable.
As an exposure method. Examples include stepper exposure and exposure with a high-pressure mercury lamp.
Exposure is more preferably 5mJ / cm ² ~3000mJ / cm ² is preferably ^{10mJ / cm 2 ~2000mJ / cm 2} , 50mJ / cm 2 ~1000mJ / cm 2 being most preferred.

Examples of the entire surface exposure processing method include a method of exposing the entire surface of the formed film. When the near-infrared absorbing composition contains a polymerizable compound, the entire surface exposure promotes curing of the polymerization component in the film formed from the composition, further curing of the film, mechanical strength, Durability is improved.
There is no restriction | limiting in particular as an apparatus which performs the said whole surface exposure, Although it can select suitably according to the objective, For example, UV exposure machines, such as an ultrahigh pressure mercury lamp, are mentioned suitably.

Moreover, as a method of the whole surface heat treatment, a method of heating the entire surface of the formed film can be mentioned. By heating the entire surface, the film strength of the pattern is increased.
120 to 250 degreeC is preferable and the heating temperature in a whole surface heating has more preferable 120 to 250 degreeC. When the heating temperature is 120 ° C. or higher, the film strength is improved by heat treatment, and when the heating temperature is 250 ° C. or lower, the components in the film are decomposed and the film quality is prevented from becoming weak and brittle.
The heating time in the entire surface heating is preferably 3 minutes to 180 minutes, and more preferably 5 minutes to 120 minutes.
There is no restriction | limiting in particular as an apparatus which performs whole surface heating, According to the objective, it can select suitably from well-known apparatuses, For example, a dry oven, a hot plate, IR heater etc. are mentioned.

  Moreover, this invention is a camera module which has a solid-state image sensor board | substrate and the near-infrared cut filter arrange | positioned at the light-receiving side of the said solid-state image sensor board | substrate, Comprising: The said near-infrared cut filter is a near-infrared cut filter of this invention. It also relates to the camera module.

Hereinafter, although the camera module which concerns on embodiment of this invention is demonstrated, referring FIG. 1 and FIG. 2, this invention is not limited by the following specific examples.
In FIG. 1 and FIG. 2, common parts are denoted by common reference numerals.
In the description, “upper”, “upper”, and “upper” refer to the side far from the silicon substrate 10, and “lower”, “lower”, and “lower” are closer to the silicon substrate 10. Point to.

FIG. 1 is a schematic cross-sectional view illustrating a configuration of a camera module including a solid-state imaging device.
A camera module 200 shown in FIG. 1 is connected to a circuit board 70 that is a mounting board via solder balls 60 that are connection members.
Specifically, the camera module 200 is provided on the first main surface side (light receiving side) of the solid-state image sensor substrate 100 and the solid-state image sensor substrate 100 provided with an image sensor section on the first main surface of the silicon substrate. The flattening layer (not shown in FIG. 1), the glass substrate 30 (light transmissive substrate) provided on the flattening layer, and the glass substrate 30 (light transmissive substrate) disposed above the glass substrate 30 An infrared cut filter 42, a lens holder 50 that is disposed above the near infrared cut filter 42 and has an imaging lens 40 in the internal space, and a light shielding / electromagnetic wave disposed so as to surround the solid-state imaging device substrate 100 and the glass substrate 30. And a shield 44. Each member is bonded by adhesives 20 and 45.
The present invention is a method of manufacturing a camera module having a solid-state image pickup device substrate and a near-infrared cut filter disposed on the light-receiving side of the solid-state image pickup device substrate. The present invention also relates to a step of forming a film by applying the near infrared absorbing composition.
Therefore, in the camera module according to the present embodiment, for example, the near-infrared cut filter 42 can be formed by forming a film by applying the near-infrared absorbing composition of the present invention on the planarizing layer. The method for applying the near-infrared cut filter is as described above.
In the camera module 200, the incident light hν from the outside passes through the imaging lens 40, the near-infrared cut filter 42, the glass substrate 30, and the planarization layer in order, and then reaches the imaging device portion of the solid-state imaging device substrate 100. It has become. The camera module 200 is connected to the circuit board 70 via a solder ball 60 (connection material) on the second main surface side of the solid-state imaging device substrate 100.
In the camera module 200, the glass substrate 30 may be omitted, and the near infrared cut filter may be provided directly on the planarization layer, or the planarization layer may be omitted and the near infrared cut filter may be provided on the glass substrate 30. .

FIG. 2 is an enlarged cross-sectional view of the solid-state imaging device substrate 100 in FIG.
The solid-state image sensor substrate 100 includes a silicon substrate 10 as a base, an image sensor 12, an interlayer insulating film 13, a base layer 14, a red color filter 15R, a green color filter 15G, a blue color filter 15B, an overcoat 16, a micro The lens 17, the light shielding film 18, the insulating film 22, the metal electrode 23, the solder resist layer 24, the internal electrode 26, and the element surface electrode 27 are configured.
However, the solder resist layer 24 may be omitted.

First, the configuration on the first main surface side of the solid-state imaging device substrate 100 will be mainly described.
As shown in FIG. 2, an imaging element unit in which a plurality of imaging elements 12 such as CCDs and CMOSs are two-dimensionally arranged is provided on the first main surface side of the silicon substrate 10 that is a base of the solid-state imaging element substrate 100. ing.
An interlayer insulating film 13 is formed on the image sensor 12 in the image sensor section, and a base layer 14 is formed on the interlayer insulating film 13. Furthermore, on the base layer 14, a red color filter 15 R, a green color filter 15 G, and a blue color filter 15 B (hereinafter collectively referred to as “color filter 15”) corresponding to the image sensor 12. ) Are arranged.
A light shielding film (not shown) may be provided around the boundary between the red color filter 15R, the green color filter 15G, and the blue color filter 15B, and the periphery of the imaging element unit. This light shielding film can be produced using, for example, a known black color resist.
An overcoat 16 is formed on the color filter 15, and a microlens 17 is formed on the overcoat 16 so as to correspond to the imaging element 12 (color filter 15).
The planarizing layer is provided on the microlens 17.

In addition, a peripheral circuit (not shown) and an internal electrode 26 are provided around the image sensor section on the first main surface side, and the internal electrode 26 is electrically connected to the image sensor 12 via the peripheral circuit. Has been.
Furthermore, an element surface electrode 27 is formed on the internal electrode 26 with the interlayer insulating film 13 interposed therebetween. In the interlayer insulating film 13 between the internal electrode 26 and the element surface electrode 27, a contact plug (not shown) for electrically connecting these electrodes is formed. The element surface electrode 27 is used for applying a voltage and reading a signal through the contact plug and the internal electrode 26.
A base layer 14 is formed on the element surface electrode 27. An overcoat 16 is formed on the base layer 14. The base layer 14 and the overcoat 16 formed on the element surface electrode 27 are opened to form a pad opening, and a part of the element surface electrode 27 is exposed.

The above is the configuration of the first main surface side of the solid-state imaging device substrate 100. Instead of providing the near-infrared cut filter 42 on the planarization layer, the base layer 14 and the color filter 15 or A form in which a near-infrared cut filter is provided between the color filter 15 and the overcoat 16 may be employed.
On the first main surface side of the solid-state image sensor substrate 100, an adhesive 20 is provided around the image sensor section, and the solid-state image sensor substrate 100 and the glass substrate 30 are bonded via the adhesive 20.

  The silicon substrate 10 has a through hole that penetrates the silicon substrate 10, and a through electrode that is a part of the metal electrode 23 is provided in the through hole. The imaging element portion and the circuit board 70 are electrically connected by the through electrode.

Next, the configuration on the second main surface side of the solid-state imaging device substrate 100 will be mainly described.
On the second main surface side, an insulating film 22 is formed from the second main surface to the inner wall of the through hole.
On the insulating film 22, a metal electrode 23 patterned so as to extend from a region on the second main surface of the silicon substrate 10 to the inside of the through hole is provided. The metal electrode 23 is an electrode for connecting the image pickup element portion in the solid-state image pickup element substrate 100 and the circuit board 70.
The through electrode is a portion of the metal electrode 23 formed inside the through hole. The through electrode penetrates through the silicon substrate 10 and part of the interlayer insulating film, reaches the lower side of the internal electrode 26, and is electrically connected to the internal electrode 26.

Further, a solder resist layer 24 (protective layer) is provided on the second main surface side, which covers the second main surface on which the metal electrode 23 is formed and has an opening that exposes a portion on the metal electrode 23. Insulating film).
Further, on the second main surface side, there is provided a light shielding film 18 that covers the second main surface on which the solder resist layer 24 is formed and has an opening through which a part of the metal electrode 23 is exposed. It has been.
In FIG. 2, the light shielding film 18 is patterned so as to cover a part of the metal electrode 23 and expose the remaining part, but may be patterned so as to expose the entire metal electrode 23. (The same applies to the patterning of the solder resist layer 24).
The solder resist layer 24 may be omitted, and the light shielding film 18 may be directly formed on the second main surface on which the metal electrode 23 is formed.

  A solder ball 60 as a connection member is provided on the exposed metal electrode 23, and the metal electrode 23 of the solid-state imaging device substrate 100 and a connection electrode (not shown) of the circuit board 70 are connected via the solder ball 60. , Are electrically connected.

As mentioned above, although the structure of the solid-state image sensor substrate 100 was demonstrated, the method as described in Paragraph 0033-0068 of Unexamined-Japanese-Patent No. 2009-158863, the method as described in Paragraph 0036-0065 of Unexamined-Japanese-Patent No. 2009-99951, etc. It can be formed by a known method.
The interlayer insulating film 13 is formed as a SiO ₂ film or a SiN film by, for example, sputtering or CVD (Chemical Vapor Deposition).
The color filter 15 is formed by photolithography using a known color resist, for example.
The overcoat 16 and the base layer 14 are formed, for example, by photolithography using a known organic interlayer film forming resist.
The microlens 17 is formed by photolithography or the like using, for example, a styrene polymer.
The solder resist layer 24 is preferably formed by photolithography using a known solder resist containing, for example, a phenolic polymer, a polyimide polymer, or an amine polymer.
The solder ball 60 is formed using, for example, Sn—Ag, Sn—Cu, Sn—Ag—Cu as Sn—Pb (eutectic), 95Pb—Sn (high lead high melting point solder), and Pb free solder. . The solder ball 60 is formed in a spherical shape having a diameter of 100 μm to 1000 μm (preferably a diameter of 150 μm to 700 μm), for example.
The internal electrode 26 and the element surface electrode 27 are formed as a metal electrode such as Cu by CMP (Chemical Mechanical Polishing) or photolithography and etching, for example.
The metal electrode 23 is formed as a metal electrode such as Cu, Au, Al, Ni, W, Pt, Mo, Cu compound, W compound, and Mo compound by sputtering, photolithography, etching, and electrolytic plating, for example. The metal electrode 23 may have a single layer configuration or a stacked configuration including two or more layers. The film thickness of the metal electrode 23 is, for example, 0.1 μm to 20 μm (preferably 0.1 μm to 10 μm). The silicon substrate 10 is not particularly limited, but a silicon substrate that is thinned by scraping the back surface of the substrate can be used. Although the thickness of the substrate is not limited, for example, a silicon wafer having a thickness of 20 μm to 200 μm (preferably 30 to 150 μm) is used.
The through hole of the silicon substrate 10 is formed by, for example, photolithography and RIE (Reactive Ion Etching).

  As mentioned above, although one Embodiment of the camera module was described with reference to FIG. 1 and FIG. 2, the said embodiment is not restricted to the form of FIG. 1 and FIG.

  The present invention will be described more specifically with reference to the following 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. Therefore, the scope of the present invention is not limited to the specific examples shown below.

In this example, the following abbreviations were adopted.
<Polymerizable compound>
KARAYAD DPHA: (Nippon Kayaku Co., Ltd., mixture of dipentaerythritol pentaacrylate and dipentaerythritol hexaacrylate)
JER157S65: (Mitsubishi Chemical Corporation, special novolac type epoxy resin)
KAYARAD D-320: (Nippon Kayaku Co., Ltd., dipentaerythritol tetraacrylate)
M-510: (manufactured by Toagosei Co., Ltd., polybasic acid-modified acrylic oligomer)
M-520: (manufactured by Toagosei Co., Ltd., polybasic acid-modified acrylic oligomer)
DPCA-60: (Nippon Kayaku Co., Ltd., 6-functional acrylate having 6 pentyleneoxy chains)
<Solvent>
PGMEA: Propylene glycol monomethyl ether acetate THF: Tetrahydrofuran

<Synthesis example of phosphate ester copper complex>
2-hydroxyethyl methacrylate 50 g (0.38 mol manufactured by Wako Pure Chemical Industries, Ltd.) and phenyl phosphate ester 73.6 g (0.42 mol manufactured by Tokyo Chemical Industry Co., Ltd.) in a pyridine solution (180 mL manufactured by Wako Pure Chemical Industries, Ltd.) ) A pyridine solution (400 mL) of 116 g of 1,3,5-triisopropylsulfonic acid chloride (0.38 mol, manufactured by Tokyo Chemical Industry Co., Ltd.) was added at 5 ° C. or lower. After the addition, the reaction was terminated by stirring at room temperature for 6 hours. In order not to raise the temperature by 30 ° C. or more, 2.9 L of 10% aqueous sodium hydrogen carbonate solution was added, and then washing with ethyl acetate was performed. Concentrated hydrochloric acid was added to the aqueous layer to adjust the pH to 1, and the target product was extracted with ethyl acetate. After distilling off the solvent, chloroform / water solution was used to remove 1,3,5-triisopropylsulfonic acid by-produced during the reaction. Finally, 10 mg of paramethoxyphenol (manufactured by Wako Pure Chemical Industries, Ltd.) was added, and the solvent of the organic layer was distilled off to obtain a phosphate compound as a raw material for copper complex 4 described later (22 g, yield 20). %).
The synthetic phosphate ester (3.15 g, 11.0 mmol) and methanol (16.6 g) were mixed to prepare a methanol solution of phosphate ester. Copper acetate (1 g, 5.5 mmol, manufactured by Wako Pure Chemical Industries, Ltd.) was added to the methanol solution of this phosphoric ester, and the mixture was heated to 50 ° C. and reacted for 2 hours. After completion of the reaction, the acetic acid generated in the evaporator and the solvent were distilled off to obtain phosphate ester copper complex 4 (3.5 g).
Other phosphate ester copper complexes were also obtained by a method according to this method.

<Preparation of near-infrared absorbing composition>
<Example 1>
The following compound was mixed and the near-infrared absorptive composition of Example 1 was prepared.
・ Phosphoric ester copper complex 75 parts by mass ・ Epoxy resin: JER157S65 12.5 parts by mass ・ Polymerizable compound: KARAYAD DPHA 12.5 parts by mass ・ Solvent: PGMEA 100 parts by mass

  Moreover, the near-infrared rays of each Example other than Example 1 and each comparative example are the same as Example 1 except that the phosphate copper complex and the solvent are changed to those shown in the following table. An absorbent composition was prepared.

<Evaluation of spectral characteristics of phosphate ester copper complex>
<< Measurement method of λmax >>
The λmax of the phosphate ester copper complex (20 mg) dissolved in THF (20 mL) was measured using Cary 5000 UV-Vis-NIR (manufactured by Agilent Technologies, Inc.). The results are shown in the table below.

<< Measurement Method of Gram Absorbance >>
The gram absorbance of the phosphoric acid ester copper complex (20 mg) dissolved in THF (20 mL) was measured using Cary 5000 UV-Vis-NIR (Spectrophotometer manufactured by Agilent Technologies). The results are shown in the table below.

<Evaluation of near-infrared absorbing composition>
<< Solubility Evaluation >>
The phosphate copper complex was weighed into a test tube, THF was added, and the mixture was shaken for 10 minutes to visually confirm whether it was dissolved. The evaluation results are shown below.
A: 100 mg of copper complex is put in a sample bottle, and 90 μL of THF is dissolved (visually).
B: What added 60 microliters of THF to what does not melt | dissolve in said A (100 mg of copper complexes are put into a sample bottle, and 90 microliters of THF was added) melt | dissolves (visual observation).
C: Even B (100 mg of copper complex in a sample bottle and 90 μL of THF added to 60 μL of THF) does not dissolve (visually).

<< Production of near-infrared cut filter >>
Each of the near-infrared absorbing compositions prepared in Examples and Comparative Examples was applied to a glass substrate using an applicator coating method (YOSHIMITS SEIKI Baker Applicator, YBA-3 type adjusted to a slit width of 250 μm). The applicator was applied on top and preheated (prebaked) at 100 ° C. for 120 seconds. Thereafter, all the samples were heated on a hot plate at 180 ° C. for 180 seconds to obtain near-infrared cut filters.

In the following Table, R ¹ and R ^2, R ¹ and R ² in the general formula (I). In the table below, Ph represents a phenyl group, and Bu represents a butyl group.

  The near-infrared absorptive compositions of the examples can maintain a high near-infrared shielding property when used as a cured film, and the solubility of the copper complex in the near-infrared absorptive composition is improved. The solubility could be improved while maintaining the infrared shielding property. On the other hand, the near-infrared absorbing composition of the comparative example is difficult to improve the solubility of the copper complex in the solvent while maintaining a high near-infrared shielding property when used as a cured film as compared with the examples. Met.

Moreover, in the near-infrared absorptive composition of Example 1, the near-infrared rays of Examples 11-14 were the same as Example 1 except having changed the polymeric compound (KARAYAD DPHA) into the polymeric compound of the following table | surface. A cut filter was obtained. It was confirmed that these near-infrared cut filters also have good near-infrared shielding properties.

Claims (14)

The near-infrared absorptive composition containing the phosphate ester copper complex obtained by making the phosphate compound represented by the following general formula (I) or its salt react with a copper component, and a solvent.
Formula (I)

(In general formula (Ia), R ¹ represents a group having a structure in which an aromatic ring is directly bonded to an adjacent oxygen atom, and R ¹ and R ² represent different substituents.) A phosphoric ester copper complex having copper as a central metal and a phosphate ester compound represented by the following general formula (I) as a ligand, or a copper complex containing a structure represented by the following formula (II), And the near-infrared absorptive composition containing a solvent.
Formula (I)

(In general formula (I), R ¹ represents a group having a structure in which an aromatic ring is directly bonded to an adjacent oxygen atom, and R ¹ and R ² represent different substituents.)
Formula (II)

(In the general formula (II), R ¹ represents a group having a structure in which an aromatic ring is directly bonded to an adjacent oxygen atom, and R ¹ and R ² represent different substituents. “*” Represents copper and Indicates the site of coordination bond.) The near-infrared absorptive composition of Claim 1 or 2 in which the aromatic ring in said R < ¹ > represents an unsubstituted aryl group. The near-infrared absorptive composition of any one of Claims 1-3 in which the said R < ² > represents an alkyl group or an aryl group. The near-infrared absorptive composition of any one of Claims 1-4 in which said R < ² > represents an aryl group. The near-infrared absorbing composition according to claim ¹ , wherein R ¹ and R ² are not structural isomers. The near-infrared absorptive composition of any one of Claims 1-6 which further contains a sclerosing | hardenable compound. The near-infrared absorptive composition of Claim 7 whose said curable compound is (meth) acrylate and / or an epoxy resin more than trifunctional. The near-infrared cut off filter obtained using the near-infrared absorptive composition of any one of Claims 1-8. The manufacturing method of the near-infrared cut filter which has the process of forming a film | membrane by apply | coating the near-infrared absorptive composition of any one of Claims 1-8 in the light-receiving side of a solid-state image sensor substrate. The near-infrared cut filter according to claim 9, wherein the near-infrared cut filter is a camera module having a solid-state image sensor substrate and a near-infrared cut filter disposed on a light receiving side of the solid-state image sensor substrate. A camera module, which is a near-infrared cut filter obtained by the method for producing a near-infrared cut filter according to 10. A method for manufacturing a camera module, comprising: a solid-state image sensor substrate; and a near-infrared cut filter disposed on a light-receiving side of the solid-state image sensor substrate. A method for producing a camera module, comprising a step of forming a film by applying the near-infrared absorbing composition according to claim 1. A phosphate ester copper complex having copper as a central metal and a phosphate ester compound represented by the following general formula (I) as a ligand.
Formula (I)

(In general formula (I), R ¹ represents a group having a structure in which an aromatic ring is directly bonded to an adjacent oxygen atom, and R ¹ and R ² represent different substituents.) A phosphate ester copper complex having copper as a central metal and a phosphate ester compound represented by the following general formula (III) as a ligand.
Formula (III)

(In the general formula (III), R ² represents —CH (CH ₂ CH ₃ ) (CH ₂ ) ₄ CH ₃ , —CH ₂ CH ₂ OCH ₃ ,

And any one of the groups represented by the following general formula (III-a). )
(General Formula (III-a)

(The “*” represents a bonding site with an adjacent oxygen atom. R represents a group of —CH ₃ , —COOCH ₃ , —F and —CF ₃ ).

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