JP2018151489A - Photosensitive composition, dry film, and method for forming patterned cured film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a negative type photosensitive resin composition, from which a resist pattern having a non-resist part with a good rectangular cross-sectional shape can be formed with a low dose of exposure light even when a resist pattern having a film thickness of 80 μm or more is formed; a dry film formed from the photosensitive composition; a method for forming a patterned cured film using the photosensitive resin composition; and a method for manufacturing a plated molded article by using a substrate having a patterned cured film formed by the above method as a casting mold for forming a plated molded article.SOLUTION: A negative type photosensitive composition contains (A) a photopolymerizable compound and (B) a photopolymerization initiator containing an oxime ester compound having a specific structure having a 9,9-di-substituted fluorenyl group is blended with (C) an alkali-soluble resin which is a polymer of a monomer having an unsaturated double bond and contains a unit derived from a monomer having an aromatic group.SELECTED DRAWING: None

Description

  The present invention relates to a photosensitive composition, a dry film comprising the photosensitive composition, a method for forming a patterned cured film using the photosensitive composition, and a patterned curing formed by the method. The present invention relates to a method for producing a plated model using a substrate provided with a film as a mold for forming the plated model.

  Currently, photofabrication is the mainstream of precision micromachining technology. Photofabrication is a process in which a photosensitive composition is applied to the surface of a workpiece to form a photosensitive layer, the photoresist layer is patterned by photolithography, and the patterned photosensitive layer (resist pattern) is used as a mask. It is a generic term for technologies for manufacturing various precision parts such as semiconductor packages by performing etching, electrolytic etching, or electroforming mainly composed of electroplating.

  In recent years, with the downsizing of electronic equipment, high-density packaging technology for semiconductor packages has progressed. Based on multi-pin thin film packaging of packages, miniaturization of package size, flip-chip two-dimensional packaging technology, and three-dimensional packaging technology. The packaging density is improved. In such a high-density mounting technology, as connection terminals, for example, protruding electrodes (mounting terminals) such as bumps protruding on the package, or metal posts that connect the rewirings extending from the peripheral terminals on the wafer and the mounting terminals. Etc. are arranged on the substrate with high accuracy.

For such photofabrication, a photoresist composition may be used. For photofabrication using a photoresist composition, a coating film and a conductor-forming plating resist film each having an opening through which a part of the wiring is exposed are formed on a base metal layer including the wiring. A method has been proposed in which a conductor is formed in the aforementioned opening by performing electroplating using a base metal layer as a plating current path (Patent Document 1).
In Patent Document 1, a plating resist film for forming a conductor is formed using a negative dry film resist containing an acrylic resin.

JP 2008-084919 A

When forming a thick film resist pattern in various applications as well as in photofabrication applications, a resist pattern in which the nominal shape of a portion (non-resist portion) removed by development is generally rectangular is desired.
However, for example, when a thick resist pattern having a thickness of 80 μm or more is formed, a resist having a non-resist portion having a rectangular shape with a favorable cross-sectional shape because exposure light does not sufficiently reach the bottom of the photosensitive composition layer during exposure. It is difficult to form a pattern.

  The present invention has been made in view of the above-described problems. Even when a thick resist pattern having a thickness of 80 μm or more is formed, a non-resist portion having a rectangular shape with a low exposure and a good cross-sectional shape is provided. A negative photosensitive composition capable of forming a resist pattern, a dry film comprising the photosensitive composition, a method for forming a patterned cured film using the photosensitive composition, and the method. An object of the present invention is to provide a method for producing a plated model using a substrate provided with a patterned cured film as a mold for forming a plated model.

  The inventors of the present invention provide a negative photosensitive composition comprising (A) a photopolymerizable compound and (B) a photopolymerization initiator containing an oxime ester compound having a specific structure having a 9,9-disubstituted fluorenyl group. The above-mentioned problems are solved by blending (C) an alkali-soluble resin containing a unit derived from a monomer having an aromatic group, which is a polymer of a monomer having an unsaturated double bond The present inventors have found that this can be done and have completed the present invention. Specifically, the present invention provides the following.

（Ｒ^１は水素原子、ニトロ基又は１価の有機基であり、Ｒ^２及びＲ^３は、それぞれ、置換基を有していてもよい鎖状アルキル基、置換基を有してもよい環状有機基、又は水素原子であり、Ｒ^２とＲ^３とは相互に結合して環を形成してもよく、Ｒ^４は１価の有機基であり、Ｒ^５は、水素原子、置換基を有してもよい炭素原子数１〜１１のアルキル基、又は置換基を有してもよいアリール基であり、ｎは０〜４の整数であり、ｍは０又は１である。）
で表される化合物を含み、
（Ｃ）アルカリ可溶性樹脂が、不飽和二重結合を有する単量体の重合体であり、芳香族基を有する単量体に由来する単位を含む、感光性組成物である。 The first aspect of the present invention includes (A) a photopolymerizable compound, (B) a photopolymerization initiator, and (C) an alkali-soluble resin.
(B) The photopolymerization initiator is represented by the following formula (1):

(R ¹ is a hydrogen atom, a nitro group or a monovalent organic group, and R ² and R ³ are each a chain alkyl group which may have a substituent, or a cyclic which may have a substituent. R ² and R ³ may be bonded to each other to form a ring, R ⁴ is a monovalent organic group, and R ⁵ is a hydrogen atom or a substituent. An alkyl group having 1 to 11 carbon atoms which may have an aryl group which may have a substituent, n is an integer of 0 to 4, and m is 0 or 1.)
Including a compound represented by
(C) It is a photosensitive composition in which the alkali-soluble resin is a polymer of a monomer having an unsaturated double bond and includes a unit derived from a monomer having an aromatic group.

  The second aspect of the present invention is a dry film comprising the photosensitive composition according to the first aspect.

A third aspect of the present invention is a method of forming a patterned cured film,
Laminating a photosensitive layer made of the photosensitive composition according to the first aspect on a metal surface of a substrate having a metal surface;
Exposing the photosensitive layer;
Developing the exposed photosensitive layer,
In this method, the thickness of the photosensitive layer is 80 μm or more.

  According to a fourth aspect of the present invention, a patterned cured film formed by the method according to the third aspect is plated on a substrate provided as a mold for forming a plated article, and then plated in the mold. It is a manufacturing method of the plating modeling thing including forming a modeling thing.

  According to the present invention, even when a thick resist pattern having a thickness of 80 μm or more is formed, a negative type photosensitivity capable of forming a resist pattern having a non-resist portion having a rectangular shape with a low cross-sectional shape with a low exposure amount. A composition, a dry film made of the photosensitive composition, a method of forming a patterned cured film using the photosensitive composition, and a patterned cured film formed by the method It is possible to provide a method for producing a plated model using a substrate provided as a mold for forming.

≪Photosensitive composition≫
The photosensitive composition contains (A) a photopolymerizable compound, (B) a photopolymerization initiator, and (C) an alkali-soluble resin.
And (B) a photoinitiator contains the compound of the specific structure mentioned later. Moreover, (C) alkali-soluble resin is a polymer of the monomer which has an unsaturated double bond, and contains the unit derived from the monomer which has an aromatic group.

In general, in the case where a thick cured layer having a thickness of 80 μm or more is exposed and developed to form a patterned cured film (hereinafter also referred to as “resist pattern”), the exposure light is applied to the bottom of the photosensitive layer. Therefore, it is difficult to form a resist pattern including a rectangular non-resist portion having a good cross-sectional shape.
However, when the above photosensitive composition is used, as described later, even when a thick photosensitive layer having a thickness of 80 μm or more is formed, a resist having a non-resist portion having a rectangular shape with a good cross-sectional shape. A pattern can be formed.

  Hereinafter, the component which a photosensitive composition contains and the preparation method of a photosensitive composition are demonstrated.

<(A) Photopolymerizable compound>
The (A) photopolymerizable compound (hereinafter also referred to as the component (A)) contained in the photosensitive composition is not particularly limited, and a conventionally known photopolymerizable compound can be used. Among them, a resin or monomer having an ethylenically unsaturated group is preferable, and it is more preferable to combine these. By combining a resin having an ethylenically unsaturated group and a monomer having an ethylenically unsaturated group, the curability of the photosensitive composition can be improved and pattern formation can be facilitated.

(Resin having an ethylenically unsaturated group)
As the resin having an ethylenically unsaturated group, (meth) acrylic acid, fumaric acid, maleic acid, monomethyl fumarate, monoethyl fumarate, 2-hydroxyethyl (meth) acrylate, ethylene glycol monomethyl ether (meth) acrylate, ethylene Glycol monoethyl ether (meth) acrylate, glycerol (meth) acrylate, (meth) acrylamide, acrylonitrile, methacrylonitrile, methyl (meth) acrylate, ethyl (meth) acrylate, isobutyl (meth) acrylate, 2-ethylhexyl (meth) Acrylate, benzyl (meth) acrylate, ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, triethylene glycol di (meth) acrylate, Traethylene glycol di (meth) acrylate, butylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, tetramethylolpropane tetra (meth) acrylate, pentaerythritol tri (meth) acrylate Oligomers obtained by polymerizing pentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, 1,6-hexanediol di (meth) acrylate, cardoepoxy diacrylate, etc .; Polyester obtained by reacting (meth) acrylic acid with a polyester prepolymer obtained by condensing polyhydric alcohols with monobasic acid or polybasic acid ( A) acrylate; polyurethane (meth) acrylate obtained by reacting a polyol and a compound having two isocyanate groups and then reacting with (meth) acrylic acid; bisphenol A type epoxy resin, bisphenol F type epoxy resin, Bisphenol S type epoxy resin, phenol or cresol novolak type epoxy resin, resol type epoxy resin, triphenolmethane type epoxy resin, polycarboxylic acid polyglycidyl ester, polyol polyglycidyl ester, aliphatic or cycloaliphatic epoxy resin, amine epoxy resin And an epoxy (meth) acrylate resin obtained by reacting an epoxy resin such as a dihydroxybenzene type epoxy resin with (meth) acrylic acid. Furthermore, a resin obtained by reacting an epoxy (meth) acrylate resin with a polybasic acid anhydride can be suitably used. In the present specification, “(meth) acryl” means “acryl or methacryl”.

  As the resin having an ethylenically unsaturated group, a resin obtained by further reacting a reaction product of an epoxy compound and an unsaturated group-containing carboxylic acid compound with a polybasic acid anhydride can be preferably used. .

Among these, the compound represented by the following formula (a1) is preferable. The compound represented by the formula (a1) itself is preferable in terms of high photocurability.

In the above formula (a1), X represents a group represented by the following formula (a2).

In the formula (a2), R ^1a each independently represents a hydrogen atom, a hydrocarbon group having 1 to 6 carbon atoms, or a halogen atom, R ^2a each independently represents a hydrogen atom or a methyl group, W represents a single bond or a group represented by the following structural formula (a3). In the formula (a2) and the structural formula (a3), “*” means a terminal of a bond of a divalent group.

  In the above formula (a1), Y represents a residue obtained by removing an acid anhydride group (—CO—O—CO—) from a dicarboxylic acid anhydride. Examples of dicarboxylic acid anhydrides include maleic anhydride, succinic anhydride, itaconic anhydride, phthalic anhydride, tetrahydrophthalic anhydride, hexahydrophthalic anhydride, methylendomethylenetetrahydrophthalic anhydride, chlorendic anhydride, methyltetrahydro Examples thereof include phthalic anhydride and glutaric anhydride.

  In the above formula (a1), Z represents a residue obtained by removing two acid anhydride groups from tetracarboxylic dianhydride. Examples of tetracarboxylic dianhydrides include pyromellitic anhydride, benzophenone tetracarboxylic dianhydride, biphenyl tetracarboxylic dianhydride, biphenyl ether tetracarboxylic dianhydride, and the like. Furthermore, in said formula (a1), a represents the integer of 0-20.

  The acid value of the resin having an ethylenically unsaturated group is preferably 10 to 150 mgKOH / g, and more preferably 70 to 110 mgKOH / g, in terms of resin solids. An acid value of 10 mgKOH / g or more is preferable because sufficient solubility in a developer can be obtained. Moreover, it is preferable for the acid value to be 150 mgKOH / g or less because sufficient curability can be obtained and surface properties can be improved.

  Moreover, it is preferable that it is 1000-40000, and, as for the mass mean molecular weight of resin which has an ethylenically unsaturated group, it is more preferable that it is 2000-30000. A mass average molecular weight of 1000 or more is preferable because good heat resistance and film strength can be obtained. Moreover, it is preferable for the mass average molecular weight to be 40000 or less because good developability can be obtained.

(Monomer having an ethylenically unsaturated group)
Monomers having an ethylenically unsaturated group include monofunctional monomers and polyfunctional monomers. Hereinafter, the monofunctional monomer and the polyfunctional monomer will be described in order.

  Monofunctional monomers include (meth) acrylamide, methylol (meth) acrylamide, methoxymethyl (meth) acrylamide, ethoxymethyl (meth) acrylamide, propoxymethyl (meth) acrylamide, butoxymethoxymethyl (meth) acrylamide, N-methylol ( (Meth) acrylamide, N-hydroxymethyl (meth) acrylamide, (meth) acrylic acid, fumaric acid, maleic acid, maleic anhydride, itaconic acid, itaconic anhydride, citraconic acid, citraconic anhydride, crotonic acid, 2-acrylamide- 2-methylpropane sulfonic acid, tert-butylacrylamide sulfonic acid, methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate Cyclohexyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 2-phenoxy-2-hydroxypropyl (meth) acrylate, 2- (Meth) acryloyloxy-2-hydroxypropyl phthalate, glycerin mono (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, dimethylaminoethyl (meth) acrylate, glycidyl (meth) acrylate, 2,2,2-trifluoroethyl Examples include (meth) acrylate, 2,2,3,3-tetrafluoropropyl (meth) acrylate, and half (meth) acrylate of a phthalic acid derivative. These monofunctional monomers may be used alone or in combination of two or more.

Polyfunctional monomers include ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, butylene glycol di ( (Meth) acrylate, neopentyl glycol di (meth) acrylate, 1,6-hexane glycol di (meth) acrylate, glycerin di (meth) acrylate, pentaerythritol di (meth) acrylate, diglycidyl phthalate di (meth) acrylate 2,2-bis (4- (meth) acryloxydiethoxyphenyl) propane, 2,2-bis (4- (meth) acryloxypolyethoxyphenyl) propane, 2-hydro Cis-3- (meth) acryloyloxypropyl (meth) acrylate, ethylene glycol diglycidyl ether di (meth) acrylate, diethylene glycol diglycidyl ether di (meth) acrylate, methylene bis (meth) acrylamide, urethane (meth) acrylate (ie Reaction product of tolylene diisocyanate, trimethylhexamethylene diisocyanate or hexamethylene diisocyanate and 2-hydroxyethyl (meth) acrylate), (meth) acrylamide methylene ether, tricyclodecanediol di (meth) acrylate, ethoxylated isocyanate Bifunctional monomer such as diuric acid (meth) acrylate; trimethylolpropane tri (meth) acrylate, ethoxylated isocyanuric acid di (Meth) acrylate pentaerythritol triacrylate, pentaerythritol tetraacrylate, dipentaerythritol pentaacrylate, dipentaerythritol hexaacrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, Polyfunctional monomers such as dipentaerythritol hexa (meth) acrylate, glycerin triacrylate, glycerin polyglycidyl ether poly (meth) acrylate, polyhydric alcohol and N-methylol (meth) acrylamide condensate, and triacryl formal A trifunctional or higher polyfunctional monomer is exemplified, and a bifunctional monomer is particularly preferable.
These polyfunctional monomers may be used alone or in combination of two or more.

The resist pattern formed by the photosensitive composition described above is preferably used as a mold for forming a plated model, as will be described later. However, the resist pattern used as a mold is peeled off from the substrate after plating.
Here, when the photosensitive composition contains a bifunctional monomer as the photopolymerizable compound (A), the curing of the photosensitive layer by exposure hardly proceeds excessively. If it does so, peeling after the plating of the resist pattern used as a casting_mold | template is easy.

  It is preferable that content of the photopolymerizable compound which is (A) component is 10-99.9 mass parts with respect to a total of 100 mass parts of solid content of the photosensitive composition. (A) The cured film which is excellent in heat resistance, chemical resistance, and mechanical strength using the photosensitive composition by making content of a component into 10 mass parts or more with respect to a total of 100 mass parts of solid content. Easy to form.

<(B) Photopolymerization initiator>
A photosensitive composition contains the (B) photoinitiator (henceforth (B) component) containing the compound represented by following formula (1). Since the photosensitive composition contains the compound represented by the following formula (1) as the photopolymerization initiator (B), it is extremely excellent in sensitivity. For this reason, the photosensitive composition containing the compound represented by the following formula (1) as the component (B) has a resist pattern having a non-resist portion having a rectangular shape with a good cross-sectional shape even though the film thickness is large. Can be easily formed with a low exposure amount.

  In addition, resist patterns formed on various substrates are often required to have excellent water resistance that does not peel off from the substrate due to moisture or the like. When a photosensitive composition containing a photopolymerization initiator (B) containing a compound represented by the following formula (1) is used, a resist pattern having excellent water resistance is formed that is difficult to peel off from a substrate even when contacted with water. It's easy to do.

（Ｒ^１は水素原子、ニトロ基又は１価の有機基であり、Ｒ^２及びＲ^３は、それぞれ、置換基を有してもよい鎖状アルキル基、置換基を有してもよい環状有機基、又は水素原子であり、Ｒ^２とＲ^３とは相互に結合して環を形成してもよく、Ｒ^４は１価の有機基であり、Ｒ^５は、水素原子、置換基を有してもよい炭素原子数１〜１１のアルキル基、又は置換基を有してもよいアリール基であり、ｎは０〜４の整数であり、ｍは０又は１である。）

(R ¹ is a hydrogen atom, a nitro group or a monovalent organic group, and R ² and R ³ are each a chain alkyl group which may have a substituent and a cyclic organic which may have a substituent. R ² and R ³ may be bonded to each other to form a ring, R ⁴ is a monovalent organic group, and R ⁵ has a hydrogen atom or a substituent. An alkyl group having 1 to 11 carbon atoms, or an aryl group which may have a substituent, n is an integer of 0 to 4, and m is 0 or 1.)

In Formula (1), R ¹ is a hydrogen atom, a nitro group, or a monovalent organic group. R ¹ is bonded to a 6-membered aromatic ring different from the 6-membered aromatic ring bonded to the group represented by — (CO) _m — on the fluorene ring in the formula (1). In formula (1), the bonding position of R ^{1 to} the fluorene ring is not particularly limited. When the compound represented by the formula (1) has one or more R ¹ , one of the one or more R ¹ is a fluorene ring because the synthesis of the compound represented by the formula (1) is easy. Bonding at the 2-position is preferable. When R ¹ is plural, the plural R ¹ may be the same or different.

When R ¹ is an organic group, R ¹ is not particularly limited as long as the object of the present invention is not impaired, and is appropriately selected from various organic groups. Preferable examples when R ¹ is an organic group include an alkyl group, an alkoxy group, a cycloalkyl group, a cycloalkoxy group, a saturated aliphatic acyl group, an alkoxycarbonyl group, a saturated aliphatic acyloxy group, and a substituent. An optionally substituted phenyl group, an optionally substituted phenoxy group, an optionally substituted benzoyl group, an optionally substituted phenoxycarbonyl group, an optionally substituted benzoyloxy A group, a phenylalkyl group which may have a substituent, a naphthyl group which may have a substituent, a naphthoxy group which may have a substituent, a naphthoyl group which may have a substituent, a substituent An optionally substituted naphthoxycarbonyl group, an optionally substituted naphthoyloxy group, an optionally substituted naphthylalkyl group, an optionally substituted heterocyclyl group, a substituted Examples include a heterocyclylcarbonyl group which may have a group, an amino group substituted with 1 or 2 organic groups, a morpholin-1-yl group, and a piperazin-1-yl group.

When R ¹ is an alkyl group, number of carbon atoms in the alkyl group is preferably from 1 to 20, 1 to 6 is more preferable. Further, when R ¹ is an alkyl group, it may be linear or branched. Specific examples in the case where R ¹ is an alkyl group include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, an isobutyl group, a sec-butyl group, a tert-butyl group, and an n-pentyl group. , Isopentyl group, sec-pentyl group, tert-pentyl group, n-hexyl group, n-heptyl group, n-octyl group, isooctyl group, sec-octyl group, tert-octyl group, n-nonyl group, isononyl group, An n-decyl group, an isodecyl group, etc. are mentioned. When R ¹ is an alkyl group, the alkyl group may include an ether bond (—O—) in the carbon chain. Examples of the alkyl group having an ether bond in the carbon chain include a methoxyethyl group, an ethoxyethyl group, a methoxyethoxyethyl group, an ethoxyethoxyethyl group, a propyloxyethoxyethyl group, and a methoxypropyl group.

If R ¹ is an alkoxy group, number of carbon atoms in the alkoxy group is preferably from 1 to 20, 1 to 6 is more preferable. Further, when R ¹ is an alkoxy group, it may be linear or branched. Specific examples when R ¹ is an alkoxy group include methoxy, ethoxy, n-propyloxy, isopropyloxy, n-butyloxy, isobutyloxy, sec-butyloxy, tert-butyloxy, n -Pentyloxy group, isopentyloxy group, sec-pentyloxy group, tert-pentyloxy group, n-hexyloxy group, n-heptyloxy group, n-octyloxy group, isooctyloxy group, sec-octyloxy group Tert-octyloxy group, n-nonyloxy group, isononyloxy group, n-decyloxy group, and isodecyloxy group. When R ¹ is an alkoxy group, the alkoxy group may contain an ether bond (—O—) in the carbon chain. Examples of the alkoxy group having an ether bond in the carbon chain include a methoxyethoxy group, an ethoxyethoxy group, a methoxyethoxyethoxy group, an ethoxyethoxyethoxy group, a propyloxyethoxyethoxy group, and a methoxypropyloxy group.

When R ¹ is a cycloalkyl group or a cycloalkoxy group, the number of carbon atoms of the cycloalkyl group or the cycloalkoxy group is preferably 3 to 10, and more preferably 3 to 6. Specific examples of when R ¹ is a cycloalkyl group include a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, a cycloheptyl group, and a cyclooctyl group. Specific examples when R ¹ is a cycloalkoxy group include a cyclopropyloxy group, a cyclobutyloxy group, a cyclopentyloxy group, a cyclohexyloxy group, a cycloheptyloxy group, and a cyclooctyloxy group.

When R ¹ is a saturated aliphatic acyl group or a saturated aliphatic acyloxy group, the number of carbon atoms of the saturated aliphatic acyl group or the saturated aliphatic acyloxy group is preferably 2 to 21, and more preferably 2 to 7. Specific examples when R ¹ is a saturated aliphatic acyl group include acetyl group, propanoyl group, n-butanoyl group, 2-methylpropanoyl group, n-pentanoyl group, 2,2-dimethylpropanoyl group, n -Hexanoyl group, n-heptanoyl group, n-octanoyl group, n-nonanoyl group, n-decanoyl group, n-undecanoyl group, n-dodecanoyl group, n-tridecanoyl group, n-tetradecanoyl group, n-pentadecane Examples include a noyl group and an n-hexadecanoyl group. Specific examples when R ¹ is a saturated aliphatic acyloxy group include acetyloxy group, propanoyloxy group, n-butanoyloxy group, 2-methylpropanoyloxy group, n-pentanoyloxy group, 2, 2-dimethylpropanoyloxy group, n-hexanoyloxy group, n-heptanoyloxy group, n-octanoyloxy group, n-nonanoyloxy group, n-decanoyloxy group, n-undecanoyloxy group, n -Dodecanoyloxy group, n-tridecanoyloxy group, n-tetradecanoyloxy group, n-pentadecanoyloxy group, n-hexadecanoyloxy group and the like.

When R ¹ is an alkoxycarbonyl group, the number of carbon atoms of the alkoxycarbonyl group is preferably 2-20, and more preferably 2-7. Specific examples in the case where R ¹ is an alkoxycarbonyl group include methoxycarbonyl group, ethoxycarbonyl group, n-propyloxycarbonyl group, isopropyloxycarbonyl group, n-butyloxycarbonyl group, isobutyloxycarbonyl group, sec-butyl. Oxycarbonyl group, tert-butyloxycarbonyl group, n-pentyloxycarbonyl group, isopentyloxycarbonyl group, sec-pentyloxycarbonyl group, tert-pentyloxycarbonyl group, n-hexyloxycarbonyl group, n-heptyloxycarbonyl Group, n-octyloxycarbonyl group, isooctyloxycarbonyl group, sec-octyloxycarbonyl group, tert-octyloxycarbonyl group, n-nonyloxycarbonyl group, i Examples include a sononyloxycarbonyl group, an n-decyloxycarbonyl group, and an isodecyloxycarbonyl group.

When R ¹ is a phenylalkyl group, the number of carbon atoms of the phenylalkyl group is preferably 7 to 20, and more preferably 7 to 10. Moreover, when R < ¹ > is a naphthyl alkyl group, 11-20 are preferable and, as for the carbon atom number of a naphthyl alkyl group, 11-14 are more preferable. Specific examples when R ¹ is a phenylalkyl group include a benzyl group, a 2-phenylethyl group, a 3-phenylpropyl group, and a 4-phenylbutyl group. Specific examples in the case where R ¹ is a naphthylalkyl group include an α-naphthylmethyl group, a β-naphthylmethyl group, a 2- (α-naphthyl) ethyl group, and a 2- (β-naphthyl) ethyl group. . When R ¹ is a phenylalkyl group or a naphthylalkyl group, R ¹ may further have a substituent on the phenyl group or naphthyl group.

When R ¹ is a heterocyclyl group, the heterocyclyl group is a 5-membered or 6-membered monocycle containing one or more N, S, and O, such monocycles, or such monocycles and benzene rings are condensed. Heterocyclyl group. When the heterocyclyl group is a condensed ring, the number of condensed rings is 3 or less. The heterocyclyl group may be an aromatic group (heteroaryl group) or a non-aromatic group. Examples of the heterocyclic ring constituting the heterocyclyl group include furan, thiophene, pyrrole, oxazole, isoxazole, thiazole, thiadiazole, isothiazole, imidazole, pyrazole, triazole, pyridine, pyrazine, pyrimidine, pyridazine, benzofuran, benzothiophene, indole, Examples include isoindole, indolizine, benzimidazole, benzotriazole, benzoxazole, benzothiazole, carbazole, purine, quinoline, isoquinoline, quinazoline, phthalazine, cinnoline, quinoxaline, piperidine, piperazine, morpholine, piperidine, tetrahydropyran, and tetrahydrofuran. It is done. When R ¹ is a heterocyclyl group, the heterocyclyl group may further have a substituent.

When R ¹ is a heterocyclylcarbonyl group, the heterocyclyl group contained in the heterocyclylcarbonyl group is the same as when R ¹ is a heterocyclyl group.

When R ¹ is an amino group substituted with an organic group having 1 or 2, suitable examples of the organic group include alkyl groups having 1 to 20 carbon atoms, cycloalkyl groups having 3 to 10 carbon atoms, and carbon atoms. A saturated aliphatic acyl group having 2 to 21 carbon atoms, a phenyl group which may have a substituent, a benzoyl group which may have a substituent, a phenylalkyl having 7 to 20 carbon atoms which may have a substituent A naphthyl group which may have a substituent, a naphthyl group which may have a substituent, a naphthylalkyl group having 11 to 20 carbon atoms which may have a substituent, a heterocyclyl group, and the like. . Specific examples of these suitable organic groups are the same as those for R ¹ . Specific examples of the amino group substituted with 1 or 2 organic groups include methylamino group, ethylamino group, diethylamino group, n-propylamino group, di-n-propylamino group, isopropylamino group, n- Butylamino group, di-n-butylamino group, n-pentylamino group, n-hexylamino group, n-heptylamino group, n-octylamino group, n-nonylamino group, n-decylamino group, phenylamino group, Naphthylamino group, acetylamino group, propanoylamino group, n-butanoylamino group, n-pentanoylamino group, n-hexanoylamino group, n-heptanoylamino group, n-octanoylamino group, n- Examples include a decanoylamino group, a benzoylamino group, an α-naphthoylamino group, and a β-naphthoylamino group.

In the case where the phenyl group, naphthyl group, and heterocyclyl group contained in R ¹ further have a substituent, the substituent is an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or a carbon atom. A monoalkylamino group having a saturated aliphatic acyl group having 2 to 7 carbon atoms, an alkoxycarbonyl group having 2 to 7 carbon atoms, a saturated aliphatic acyloxy group having 2 to 7 carbon atoms, and an alkyl group having 1 to 6 carbon atoms And a dialkylamino group having an alkyl group having 1 to 6 carbon atoms, a morpholin-1-yl group, a piperazin-1-yl group, a halogen, a nitro group, and a cyano group. When the phenyl group, naphthyl group, and heterocyclyl group contained in R ¹ further have a substituent, the number of the substituent is not limited as long as the object of the present invention is not impaired, but 1 to 4 is preferable. When the phenyl group, naphthyl group, and heterocyclyl group contained in R ¹ have a plurality of substituents, the plurality of substituents may be the same or different.

Among the groups described above, R ¹ is preferably a nitro group or a group represented by R ⁶ —CO— because the sensitivity tends to be improved. R ⁶ is not particularly limited as long as the object of the present invention is not impaired, and can be selected from various organic groups. Examples of a group suitable as R ⁶ include an alkyl group having 1 to 20 carbon atoms, a phenyl group which may have a substituent, a naphthyl group which may have a substituent, and a substituent. Or a heterocyclyl group that may be used. Among these groups, R ⁶ is particularly preferably a 2-methylphenyl group, a thiophen-2-yl group, or an α-naphthyl group.
In addition, as R ¹ , a hydrogen atom is preferable because transparency tends to be good. When R ¹ is a hydrogen atom and R ⁴ is a group represented by the following formula (R4-2), the transparency tends to be better.

In formula (1), R ² and R ³ are each a chain alkyl group that may have a substituent, a cyclic organic group that may have a substituent, or a hydrogen atom. R ² and R ³ may be bonded to each other to form a ring. Among these groups, R ² and R ³ are preferably chain alkyl groups which may have a substituent. When R ² and R ³ are chain alkyl groups which may have a substituent, the chain alkyl group may be a linear alkyl group or a branched alkyl group.

When R ² and R ³ are chain alkyl groups having no substituent, the number of carbon atoms of the chain alkyl group is preferably 1-20, more preferably 1-10, and particularly preferably 1-6. Specific examples in the case where R ² and R ³ are chain alkyl groups include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, sec-butyl group, and tert-butyl group. N-pentyl group, isopentyl group, sec-pentyl group, tert-pentyl group, n-hexyl group, n-heptyl group, n-octyl group, isooctyl group, sec-octyl group, tert-octyl group, n-nonyl Group, isononyl group, n-decyl group, isodecyl group and the like. When R ² and R ³ are alkyl groups, the alkyl group may contain an ether bond (—O—) in the carbon chain. Examples of the alkyl group having an ether bond in the carbon chain include a methoxyethyl group, an ethoxyethyl group, a methoxyethoxyethyl group, an ethoxyethoxyethyl group, a propyloxyethoxyethyl group, and a methoxypropyl group.

When R ² and R ³ are a chain alkyl group having a substituent, the number of carbon atoms of the chain alkyl group is preferably 1-20, more preferably 1-10, and particularly preferably 1-6. In this case, the number of carbon atoms of the substituent is not included in the number of carbon atoms of the chain alkyl group. The chain alkyl group having a substituent is preferably linear.
The substituent that the alkyl group may have is not particularly limited as long as the object of the present invention is not impaired. Preferable examples of the substituent include a cyano group, a halogen atom, a cyclic organic group, and an alkoxycarbonyl group. Examples of the halogen atom include a fluorine atom, a chlorine atom, a bromine atom, and an iodine atom. In these, a fluorine atom, a chlorine atom, and a bromine atom are preferable. Examples of the cyclic organic group include a cycloalkyl group, an aromatic hydrocarbon group, and a heterocyclyl group. Specific examples of the cycloalkyl group are the same as the preferred examples in the case where R ¹ is a cycloalkyl group. Specific examples of the aromatic hydrocarbon group include a phenyl group, a naphthyl group, a biphenylyl group, an anthryl group, and a phenanthryl group. Specific examples of the heterocyclyl group are the same as the preferred examples when R ¹ is a heterocyclyl group. When the substituent is an alkoxycarbonyl group, the alkoxy group contained in the alkoxycarbonyl group may be linear or branched, and is preferably linear. 1-10 are preferable and, as for the carbon atom number of the alkoxy group contained in an alkoxycarbonyl group, 1-6 are more preferable.

  When the chain alkyl group has a substituent, the number of substituents is not particularly limited. The number of preferred substituents varies depending on the number of carbon atoms in the chain alkyl group. The number of substituents is typically 1-20, preferably 1-10, and more preferably 1-6.

When R ² and R ³ are cyclic organic groups, the cyclic organic group may be an alicyclic group or an aromatic group. Examples of the cyclic organic group include an aliphatic cyclic hydrocarbon group, an aromatic hydrocarbon group, and a heterocyclyl group. When R ² and R ³ are cyclic organic groups, the substituents that the cyclic organic group may have are the same as when R ² and R ³ are chain alkyl groups.

When R ² and R ³ are aromatic hydrocarbon groups, is the aromatic hydrocarbon group a phenyl group or a group formed by bonding a plurality of benzene rings via carbon-carbon bonds? A group formed by condensation of a plurality of benzene rings is preferred. When the aromatic hydrocarbon group is a phenyl group or a group formed by combining or condensing a plurality of benzene rings, the number of benzene rings contained in the aromatic hydrocarbon group is not particularly limited, 3 or less is preferable, 2 or less is more preferable, and 1 is particularly preferable. Preferable specific examples of the aromatic hydrocarbon group include a phenyl group, a naphthyl group, a biphenylyl group, an anthryl group, and a phenanthryl group.

When R ² and R ³ are aliphatic cyclic hydrocarbon groups, the aliphatic cyclic hydrocarbon group may be monocyclic or polycyclic. Although the carbon atom number of an aliphatic cyclic hydrocarbon group is not specifically limited, 3-20 are preferable and 3-10 are more preferable. Examples of monocyclic cyclic hydrocarbon groups are cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, norbornyl, isobornyl, tricyclononyl, tricyclodecyl, Examples include a tetracyclododecyl group and an adamantyl group.

When R ² and R ³ are heterocyclyl groups, the heterocyclyl group is a 5-membered or 6-membered monocycle containing one or more N, S, O, such monocycles, or such monocycles and benzene rings. And a condensed heterocyclyl group. When the heterocyclyl group is a condensed ring, the number of condensed rings is 3 or less. The heterocyclyl group may be an aromatic group (heteroaryl group) or a non-aromatic group. Examples of the heterocyclic ring constituting the heterocyclyl group include furan, thiophene, pyrrole, oxazole, isoxazole, thiazole, thiadiazole, isothiazole, imidazole, pyrazole, triazole, pyridine, pyrazine, pyrimidine, pyridazine, benzofuran, benzothiophene, indole, Examples include isoindole, indolizine, benzimidazole, benzotriazole, benzoxazole, benzothiazole, carbazole, purine, quinoline, isoquinoline, quinazoline, phthalazine, cinnoline, quinoxaline, piperidine, piperazine, morpholine, piperidine, tetrahydropyran, and tetrahydrofuran. It is done.

R ² and R ³ may be bonded to each other to form a ring. The group consisting of the ring formed by R ² and R ³ is preferably a cycloalkylidene group. When R ² and R ³ are bonded to form a cycloalkylidene group, the ring constituting the cycloalkylidene group is preferably a 5-membered ring to a 6-membered ring, and more preferably a 5-membered ring.

When the group formed by combining R ² and R ³ is a cycloalkylidene group, the cycloalkylidene group may be condensed with one or more other rings. Examples of the ring that may be condensed with the cycloalkylidene group include benzene ring, naphthalene ring, cyclobutane ring, cyclopentane ring, cyclohexane ring, cycloheptane ring, cyclooctane ring, furan ring, thiophene ring, pyrrole ring, pyridine A ring, a pyrazine ring, and a pyrimidine ring.

Examples of a suitable group among R ² and R ³ described above include a group represented by the formula -A ¹ -A ² . In the formula, A ¹ is a linear alkylene group, and A ² is an alkoxy group, a cyano group, a halogen atom, a halogenated alkyl group, a cyclic organic group, or an alkoxycarbonyl group.

The number of carbon atoms of the linear alkylene group for A ¹ is preferably 1 to 10, and more preferably 1 to 6. When A ² is an alkoxy group, the alkoxy group may be linear or branched, and is preferably linear. 1-10 are preferable and, as for the carbon atom number of an alkoxy group, 1-6 are more preferable. When A ² is a halogen atom, a fluorine atom, a chlorine atom, a bromine atom and an iodine atom are preferable, and a fluorine atom, a chlorine atom and a bromine atom are more preferable. When A ² is a halogenated alkyl group, the halogen atom contained in the halogenated alkyl group is preferably a fluorine atom, a chlorine atom, a bromine atom, or an iodine atom, and more preferably a fluorine atom, a chlorine atom, or a bromine atom. The halogenated alkyl group may be linear or branched, and is preferably linear. When A ² is a cyclic organic group, examples of the cyclic organic group are the same as the cyclic organic group that R ² and R ³ have as a substituent. When A ² is an alkoxycarbonyl group, examples of the alkoxycarbonyl group are the same as the alkoxycarbonyl group that R ² and R ³ have as a substituent.

Preferable specific examples of R ² and R ³ include an alkyl group such as an ethyl group, n-propyl group, n-butyl group, n-hexyl group, n-heptyl group, and n-octyl group; 2-methoxyethyl Group, 3-methoxy-n-propyl group, 4-methoxy-n-butyl group, 5-methoxy-n-pentyl group, 6-methoxy-n-hexyl group, 7-methoxy-n-heptyl group, 8-methoxy -N-octyl group, 2-ethoxyethyl group, 3-ethoxy-n-propyl group, 4-ethoxy-n-butyl group, 5-ethoxy-n-pentyl group, 6-ethoxy-n-hexyl group, 7- Alkoxyalkyl groups such as ethoxy-n-heptyl group and 8-ethoxy-n-octyl group; 2-cyanoethyl group, 3-cyano-n-propyl group, 4-cyano-n-butyl group, 5-cyano-n -Pen Group, 6-cyano-n-hexyl group, 7-cyano-n-heptyl group, and 8-cyano-n-octyl group; 2-phenylethyl group, 3-phenyl-n-propyl group Phenylalkyl such as 4-phenyl-n-butyl group, 5-phenyl-n-pentyl group, 6-phenyl-n-hexyl group, 7-phenyl-n-heptyl group, and 8-phenyl-n-octyl group Groups: 2-cyclohexylethyl group, 3-cyclohexyl-n-propyl group, 4-cyclohexyl-n-butyl group, 5-cyclohexyl-n-pentyl group, 6-cyclohexyl-n-hexyl group, 7-cyclohexyl-n- Heptyl group, 8-cyclohexyl-n-octyl group, 2-cyclopentylethyl group, 3-cyclopentyl-n-propyl group, 4-cyclopentyl- cycloalkylalkyl groups such as an n-butyl group, a 5-cyclopentyl-n-pentyl group, a 6-cyclopentyl-n-hexyl group, a 7-cyclopentyl-n-heptyl group, and an 8-cyclopentyl-n-octyl group; Methoxycarbonylethyl group, 3-methoxycarbonyl-n-propyl group, 4-methoxycarbonyl-n-butyl group, 5-methoxycarbonyl-n-pentyl group, 6-methoxycarbonyl-n-hexyl group, 7-methoxycarbonyl- n-heptyl group, 8-methoxycarbonyl-n-octyl group, 2-ethoxycarbonylethyl group, 3-ethoxycarbonyl-n-propyl group, 4-ethoxycarbonyl-n-butyl group, 5-ethoxycarbonyl-n-pentyl Group, 6-ethoxycarbonyl-n-hexyl group, 7-ethoxycal Alkoxycarbonylalkyl groups such as nyl-n-heptyl and 8-ethoxycarbonyl-n-octyl; 2-chloroethyl, 3-chloro-n-propyl, 4-chloro-n-butyl, 5-chloro -N-pentyl group, 6-chloro-n-hexyl group, 7-chloro-n-heptyl group, 8-chloro-n-octyl group, 2-bromoethyl group, 3-bromo-n-propyl group, 4-bromo -N-butyl group, 5-bromo-n-pentyl group, 6-bromo-n-hexyl group, 7-bromo-n-heptyl group, 8-bromo-n-octyl group, 3,3,3-trifluoro Examples thereof include a propyl group and a halogenated alkyl group such as 3,3,4,4,5,5,5-heptafluoro-n-pentyl group.

Among R ² and R ³ , preferred groups among the above are ethyl group, n-propyl group, n-butyl group, n-pentyl group, 2-methoxyethyl group, 2-cyanoethyl group, 2-phenylethyl group, 2-cyclohexylethyl group, 2-methoxycarbonylethyl group, 2-chloroethyl group, 2-bromoethyl group, 3,3,3-trifluoropropyl group, and 3,3,4,4,5,5,5-hepta A fluoro-n-pentyl group;

Examples of suitable organic groups for R ⁴ include, similarly to R ¹ , an alkyl group, an alkoxy group, a cycloalkyl group, a cycloalkoxy group, a saturated aliphatic acyl group, an alkoxycarbonyl group, a saturated aliphatic acyloxy group, and a substituent. A phenyl group which may have a substituent, a phenoxy group which may have a substituent, a benzoyl group which may have a substituent, a phenoxycarbonyl group which may have a substituent, and a substituent A good benzoyloxy group, a phenylalkyl group which may have a substituent, a naphthyl group which may have a substituent, a naphthoxy group which may have a substituent, a naphthoyl group which may have a substituent, An optionally substituted naphthoxycarbonyl group, an optionally substituted naphthoyloxy group, an optionally substituted naphthylalkyl group, and an optionally substituted heterocyclyl group An optionally substituted heterocyclyl group, 1, or an amino group substituted with two organic groups, morpholin-1-yl group, and piperazine-1-yl group. Specific examples of these groups are the same as those described for R ¹ . R ⁴ is also preferably a cycloalkylalkyl group, a phenoxyalkyl group optionally having a substituent on the aromatic ring, or a phenylthioalkyl group optionally having a substituent on the aromatic ring. The substituent that the phenoxyalkyl group and the phenylthioalkyl group may have is the same as the substituent that the phenyl group contained in R ¹ may have.

Among organic groups, as R ⁴ , an alkyl group, a cycloalkyl group, an optionally substituted phenyl group, or a cycloalkylalkyl group, an optionally substituted phenylthio group on an aromatic ring. Alkyl groups are preferred. As the alkyl group, an alkyl group having 1 to 20 carbon atoms is preferable, an alkyl group having 1 to 8 carbon atoms is more preferable, an alkyl group having 1 to 4 carbon atoms is particularly preferable, and a methyl group is most preferable. Among the phenyl groups that may have a substituent, a methylphenyl group is preferable, and a 2-methylphenyl group is more preferable. The number of carbon atoms of the cycloalkyl group contained in the cycloalkylalkyl group is preferably 5 to 10, more preferably 5 to 8, and particularly preferably 5 or 6. 1-8 are preferable, as for the carbon atom number of the alkylene group contained in a cycloalkylalkyl group, 1-4 are more preferable, and 2 is especially preferable. Of the cycloalkylalkyl groups, a cyclopentylethyl group is preferred. 1-8 are preferable, as for the carbon atom number of the alkylene group contained in the phenylthioalkyl group which may have a substituent on an aromatic ring, 1-4 are more preferable, and 2 is especially preferable. Among the phenylthioalkyl groups which may have a substituent on the aromatic ring, a 2- (4-chlorophenylthio) ethyl group is preferable.

In addition, as R ⁴ , a group represented by —A ³ —CO—O—A ⁴ is also preferable. A ³ is a divalent organic group, preferably a divalent hydrocarbon group, and more preferably an alkylene group. A ⁴ is a monovalent organic group, and is preferably a monovalent hydrocarbon group.

When A ³ is an alkylene group, the alkylene group may be linear or branched, and is preferably linear. If A ³ is an alkylene group, number of carbon atoms in the alkylene group is preferably 1 to 10, more preferably 1 to 6, 1 to 4 are particularly preferred.

Preferable examples of A ⁴ include an alkyl group having 1 to 10 carbon atoms, an aralkyl group having 7 to 20 carbon atoms, and an aromatic hydrocarbon group having 6 to 20 carbon atoms. Preferred examples of A ⁴ include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, sec-butyl group, tert-butyl group, n-pentyl group, and n-hexyl. Group, phenyl group, naphthyl group, benzyl group, phenethyl group, α-naphthylmethyl group, β-naphthylmethyl group and the like.

Preferred examples of the group represented by —A ³ —CO—O—A ⁴ include 2-methoxycarbonylethyl group, 2-ethoxycarbonylethyl group, 2-n-propyloxycarbonylethyl group, 2-n -Butyloxycarbonylethyl group, 2-n-pentyloxycarbonylethyl group, 2-n-hexyloxycarbonylethyl group, 2-benzyloxycarbonylethyl group, 2-phenoxycarbonylethyl group, 3-methoxycarbonyl-n-propyl Group, 3-ethoxycarbonyl-n-propyl group, 3-n-propyloxycarbonyl-n-propyl group, 3-n-butyloxycarbonyl-n-propyl group, 3-n-pentyloxycarbonyl-n-propyl group , 3-n-hexyloxycarbonyl-n-propyl group, 3-benzyloxycarbonyl -n- propyl group, and 3-phenoxycarbonyl -n- propyl group and the like.

（式（Ｒ４−１）及び（Ｒ４−２）中、Ｒ^７及びＲ^８はそれぞれ有機基であり、ｐは０〜４の整数であり、Ｒ^７及びＲ^８がベンゼン環上の隣接する位置に存在する場合、Ｒ^７とＲ^８とが互いに結合して環を形成してもよく、ｑは１〜８の整数であり、ｒは１〜５の整数であり、ｓは０〜（ｒ＋３）の整数であり、Ｒ^９は有機基である。） Having described ^{R 4,} as is ^{R 4,} preferably a group represented by the following formula (R4-1) or (R4-2).

(In formulas (R4-1) and (R4-2), R ⁷ and R ⁸ are each an organic group, p is an integer of 0 to 4, and R ⁷ and R ⁸ are adjacent positions on the benzene ring. R ⁷ and R ⁸ may be bonded to each other to form a ring, q is an integer of 1 to 8, r is an integer of 1 to 5, and s is 0 to (r + 3). ) And R ⁹ is an organic group.)

Examples of the organic group for R ⁷ and R ^{8 in} formula (R4-1) are the same as those for R ¹ . R ⁷ is preferably an alkyl group or a phenyl group. When R ⁷ is an alkyl group, the number of carbon atoms is preferably 1 to 10, more preferably 1 to 5, particularly preferably 1 to 3, and most preferably 1. That is, R ⁷ is most preferably a methyl group. When R ⁷ and R ⁸ are combined to form a ring, the ring may be an aromatic ring or an aliphatic ring. Preferable examples of the group represented by the formula (R4-1) in which R ⁷ and R ⁸ form a ring include a naphthalen-1-yl group, 1, 2, 3, 4-tetrahydronaphthalen-5-yl group etc. are mentioned. In said formula (R4-1), p is an integer of 0-4, it is preferable that it is 0 or 1, and it is more preferable that it is 0.

In the above formula (R4-2), R ⁹ is an organic group. Examples of the organic group include the same groups as those described for R ¹ . Of the organic groups, an alkyl group is preferred. The alkyl group may be linear or branched. 1-10 are preferable, as for the carbon atom number of an alkyl group, 1-5 are more preferable, and 1-3 are especially preferable. R ⁹ is preferably exemplified by a methyl group, an ethyl group, a propyl group, an isopropyl group, a butyl group, and among these, a methyl group is more preferable.

  In said formula (R4-2), r is an integer of 1-5, the integer of 1-3 is preferable and 1 or 2 is more preferable. In said formula (R4-2), s is 0- (r + 3), the integer of 0-3 is preferable, the integer of 0-2 is more preferable, and 0 is especially preferable. In said formula (R4-2), q is an integer of 1-8, the integer of 1-5 is preferable, the integer of 1-3 is more preferable, and 1 or 2 is especially preferable.

In Formula (1), R ⁵ is a hydrogen atom, an alkyl group having 1 to 11 carbon atoms which may have a substituent, or an aryl group which may have a substituent. Preferred examples of the substituent that may be present when R ⁵ is an alkyl group include a phenyl group and a naphthyl group. In addition, preferred examples of the substituent that R ¹ may have when it is an aryl group include an alkyl group having 1 to 5 carbon atoms, an alkoxy group, and a halogen atom.

In formula (1), preferred examples of R ⁵ include a hydrogen atom, a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, a phenyl group, a benzyl group, a methylphenyl group, and a naphthyl group. Among these, a methyl group or a phenyl group is more preferable.

The content of the photopolymerization initiator (B) is preferably 0.001 to 30 parts by mass, and 0.1 to 20 parts by mass with respect to a total of 100 parts by mass of the solid content of the photosensitive composition. Is more preferable, and 0.5 to 10 parts by mass is even more preferable.
Moreover, it is preferable that content of the photoinitiator which is (B) component is 0.1-50 mass% with respect to the sum total of (A) component and (B) component, and 0.5-30 It is more preferable that it is mass%, and it is further more preferable that it is 1-20 mass%.
Content of the compound represented by following formula (1) should just be the range of 1-100 mass% with respect to the whole (B) component, for example, Preferably it is 50 mass% or more, and is 70-100 mass%. It is more preferable that

The compound represented by Formula (1) in the component (B) may be used alone or in combination of two or more. When two or more are used, the following (i) to (iii) are preferable.
(I) Compound combination of compounds ^{R 1} is a hydrogen atom and ^{R 1} is a compound which is a nitro group (ii) ^{R 4} is formula (R4-1) and ^{R 4} is formula (R4-2) Combination with compound (iii) Compound in which R ⁴ is formula (R4-1) or formula (R4-2) and compound in which R ⁴ is an alkyl group having 1 to 4 carbon atoms Among them, sensitivity and transmission of cured product From the viewpoint of improving characteristics such as the rate, the combination (i) is preferable, and the combination satisfying the above (i) and (ii) or (iii) is more preferable.

  What is necessary is just to adjust suitably the compounding ratio (mass ratio) of each compound by the combination of said (i)-(iii) according to characteristics, such as target sensitivity. For example, 1:99 to 99: 1 is preferable, 10:90 to 90:10 is more preferable, and 30:70 to 70; 30 is still more preferable.

Preferable specific examples of the compound represented by the formula (1) include the following compounds 1 to 41.

<(C) Alkali-soluble resin>
The photosensitive composition contains (C) an alkali-soluble resin as a resin other than the resin used as the (A) photopolymerizable compound. By blending the alkali-soluble resin (C) with the photosensitive composition, alkali developability is imparted to the photosensitive composition.

  In this specification, the alkali-soluble resin means that a resin film having a film thickness of 1 μm is formed on a substrate with a resin solution (solvent: propylene glycol monomethyl ether acetate) having a resin concentration of 20% by mass, and KOH having a concentration of 0.05% by mass. When immersed in an aqueous solution for 1 minute, it means one that dissolves to a thickness of 0.01 μm or more.

Moreover, (C) alkali-soluble resin is a polymer of the monomer which has an unsaturated double bond, Comprising: The unit derived from the monomer which has an aromatic group is included. Thereby, it is easy to form a non-resist portion having a rectangular shape with a good cross-sectional shape even though the film thickness is large.
(C) As for the ratio of the unit derived from the monomer which has an aromatic group with respect to the total mass of alkali-soluble resin, 5-95 mass% is preferable, and 30-95 mass% is more preferable.

Here, the aromatic group may be an aromatic hydrocarbon group or an aromatic heterocyclic group, and is preferably an aromatic hydrocarbon group.
As the polymer containing a unit having an aromatic group, a polymer (C-I) containing a unit derived from an unsaturated carboxylic acid and a unit having an aromatic group is preferable. As the polymer (CI), a polymer containing a unit derived from (meth) acrylic acid and a unit having an aromatic group is more preferable.
Moreover, the polymer (C-II) containing the unit which has a phenolic hydroxyl group is also preferable as a polymer of the monomer which has an unsaturated double bond, and contains the unit which has an aromatic group.

(Polymer (CI))
The polymer (C-I) includes a unit derived from an unsaturated carboxylic acid and a unit having an aromatic group. By including a unit derived from an unsaturated carboxylic acid, the polymer (C-I) exhibits good alkali solubility and can impart flexibility to the formed resist pattern and suppress the occurrence of cracks in the resist pattern. Cheap.
Examples of the unsaturated carboxylic acid include (meth) acrylic acid; crotonic acid; maleic acid, fumaric acid, citraconic acid, mesaconic acid, itaconic acid, and anhydrides of these dicarboxylic acids. Among these, (meth) acrylic acid is preferable because it is easily available and has good polymerization reactivity, and (C) an alkali-soluble resin that can prepare a photosensitive composition excellent in developability can be easily obtained.
Further, the polymer (CI) is derived from a (meth) acrylic acid ester having a unit derived from a linear or branched alkyl (meth) acrylate and / or a group having an alicyclic skeleton. Preferably it contains units. In this case, since the flexibility of the polymer (CI) is particularly good, it is easy to suppress the occurrence of cracks in the formed resist pattern.
The linear or branched alkyl (meth) acrylate and the (meth) acrylic acid ester having a group having an alicyclic skeleton will be described later.

  In a polymer including a unit derived from an unsaturated carboxylic acid and a unit having an aromatic group, examples of a monomer that gives a unit having an aromatic group include benzyl vinyl ether, vinyl phenyl ether, vinyl tolyl ether, Vinyl ethers containing aromatic groups such as vinyl chlorophenyl ether, vinyl-2,4-dichlorophenyl ether, vinyl naphthyl ether, and vinyl anthranyl ether; aromatic groups such as vinyl phenyl acetate and vinyl-β-phenyl butyrate Fatty acid ester containing; phenyl (meth) acrylate, 4-methylphenyl (meth) acrylate, 3-methylphenyl (meth) acrylate, 2-methylphenyl (meth) acrylate, 4-hydroxyphenyl (meth) acrylate, 3-hydro Cyphenyl (meth) acrylate, 2-hydroxyphenyl (meth) acrylate, naphthalen-1-yl (meth) acrylate, naphthalen-2-yl (meth) acrylate, 4-phenylphenyl (meth) acrylate, 3-phenylphenyl (meta ) Acrylate, and aromatic (meth) acrylates such as 2-phenylphenyl (meth) acrylate; aralkyl (meth) acrylates such as benzyl (meth) acrylate and phenethyl (meth) acrylate; vinyl benzoate, vinyl salicylate, Aromatic carboxylic acid vinyl esters such as vinyl chlorobenzoate, vinyl tetrachlorobenzoate, and vinyl naphthoate; styrene, methylstyrene, dimethylstyrene, trimethylstyrene, ethylstyrene, diethylstyrene , Isopropyl styrene, butyl styrene, hexyl styrene, cyclohexyl styrene, decyl styrene, benzyl styrene, chloromethyl styrene, trifluoromethyl styrene, ethoxymethyl styrene, acetoxymethyl styrene, methoxy styrene, 4-methoxy-3-methyl styrene, dimethoxy Styrene, chlorostyrene, dichlorostyrene, trichlorostyrene, tetrachlorostyrene, pentachlorostyrene, bromostyrene, dibromostyrene, iodostyrene, fluorostyrene, trifluorostyrene, 2-bromo-4-trifluoromethylstyrene, and 4-fluoro Styrene or styrene derivatives such as -3-trifluoromethylstyrene; 4-glycidyloxyphenyl (meth) acrylate, 3-glyci Luoxyphenyl (meth) acrylate, 2-glycidyloxyphenyl (meth) acrylate, 4-glycidyloxyphenylmethyl (meth) acrylate, 3-glycidyloxyphenylmethyl (meth) acrylate, and 2-glycidyloxyphenylmethyl (meth) Examples include (meth) acrylic acid aromatic esters having an epoxy group such as acrylate.

  Among these monomers having aromatic groups, styrene, methyl styrene, dimethyl styrene, trimethyl styrene, ethyl styrene, diethyl styrene, isopropyl styrene, butyl styrene, hexyl styrene, cyclohexyl styrene, decyl styrene, benzyl styrene, chloro Methylstyrene, trifluoromethylstyrene, ethoxymethylstyrene, acetoxymethylstyrene, methoxystyrene, 4-methoxy-3-methylstyrene, dimethoxystyrene, chlorostyrene, dichlorostyrene, trichlorostyrene, tetrachlorostyrene, pentachlorostyrene, bromostyrene Dibromostyrene, iodostyrene, fluorostyrene, trifluorostyrene, 2-bromo-4-trifluoromethylstyrene, and 4-fluoro Styrene or a styrene derivative such as Oro-3-trifluoromethyl styrene.

The resin containing a unit derived from an unsaturated carboxylic acid and a unit having an aromatic group may contain a unit other than these units.
As a monomer that gives a unit other than a unit derived from an unsaturated carboxylic acid and a unit having an aromatic group, for example, (meth) acrylic acid ester; (meth) acrylic acid amide; allyl acetate, allyl caproate, Allyl compounds such as allyl caprylate, allyl laurate, allyl palmitate, allyl stearate, allyl benzoate, allyl acetoacetate, allyl lactate, and allyloxyethanol; hexyl vinyl ether, octyl vinyl ether, decyl vinyl ether, ethyl hexyl vinyl ether, methoxy Ethyl vinyl ether, ethoxyethyl vinyl ether, chloroethyl vinyl ether, 1-methyl-2,2-dimethylpropyl vinyl ether, 2-ethylbutyl vinyl ether, hydroxyethyl vinyl ether, diethylene Vinyl ethers such as recall vinyl ether, dimethylaminoethyl vinyl ether, diethylaminoethyl vinyl ether, butylaminoethyl vinyl ether, and tetrahydrofurfuryl vinyl ether; vinyl butyrate, vinyl isobutyrate, vinyl trimethyl acetate, vinyl diethyl acetate, vinyl valerate, vinyl carbonate Vinyl esters such as proate, vinyl chloroacetate, vinyl dichloroacetate, vinyl methoxyacetate, vinyl butoxyacetate, vinyl acetoacetate, and vinyl lactate; ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 3- Methyl-1-butene, 3-methyl-1-pentene, 3-ethyl-1-pentene, 4-methyl-1-pentene, 4- Til-1-hexene, 4,4-dimethyl-1-hexene, 4,4-dimethyl-1-pentene, 4-ethyl-1-hexene, 3-ethyl-1-hexene, 1-octene, 1-decene, Examples include olefins such as 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, and 1-eicocene.

  Among the monomers that give units other than the units derived from the unsaturated carboxylic acids exemplified above and units having an aromatic group, (meth) acrylic acid esters are preferred. Hereinafter, suitable examples of the (meth) acrylic acid ester will be described.

  Suitable examples of (meth) acrylic acid esters include linear or methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, amyl (meth) acrylate, t-octyl (meth) acrylate, and the like. Branched alkyl (meth) acrylate; chloroethyl (meth) acrylate, 2,2-dimethylhydroxypropyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, trimethylolpropane mono (meth) acrylate, and furfuryl (meth) ) Acrylate; (meth) acrylic acid ester having a group having an epoxy group; (meth) acrylic acid ester having a group having an alicyclic skeleton. Details of the (meth) acrylic acid ester having a group having an alicyclic skeleton will be described later.

  In addition, among (meth) acrylic acid esters, a photosensitive composition is used to easily form an excellent resist pattern having a good balance between heat resistance and flexibility, and thus has a group having an alicyclic skeleton (meta Acrylic acid esters are also preferred.

  In the (meth) acrylic acid ester having a group having an alicyclic skeleton, the group having an alicyclic skeleton may be monocyclic or polycyclic. Examples of the monocyclic alicyclic group include a cyclopentyl group and a cyclohexyl group. Examples of the polycyclic alicyclic group include a norbornyl group, an isobornyl group, a tricyclononyl group, a tricyclodecyl group, and a tetracyclododecyl group.

  Among the (meth) acrylic acid ester having a group having an alicyclic skeleton, examples of the (meth) acrylic acid ester having a group having an alicyclic hydrocarbon group include the following formulas (c1-1) to (c1- The compound represented by 8) is mentioned. Among these, compounds represented by the following formulas (c1-3) to (c1-8) are preferable, and compounds represented by the following formula (c1-3) or (c1-4) are more preferable.

In the above formula, R ^c1 represents a hydrogen atom or a methyl group, R ^c2 represents a single bond or a divalent saturated aliphatic hydrocarbon group having 1 to 6 carbon atoms, and R ^c3 represents a hydrogen atom or 1 carbon atom. Represents an alkyl group of ~ 5. R ^c2 is preferably a single bond or a linear or branched alkylene group such as a methylene group, an ethylene group, a propylene group, a tetramethylene group, an ethylethylene group, a pentamethylene group, or a hexamethylene group. R ^c3 is preferably a methyl group or an ethyl group.

The amount of the unit having an aromatic group in a polymer containing a unit derived from an unsaturated carboxylic acid and a unit having an aromatic group is preferably 5 to 95% by mass, more preferably 10 to 93% by mass, and 20 -90 mass% is especially preferable, and 50-85 mass% is the most preferable.
When the content of the unit having an aromatic group in the polymer (CI) is 5% by mass or more, it is easy to form a resist pattern having good heat resistance and shape.
Further, if the content of the unit having an aromatic group in the polymer (CI) is more than 95% by mass, the formed resist pattern may have too high rigidity. If the resist pattern is too rigid, cracks are likely to occur.
The amount of the unit derived from the unsaturated carboxylic acid in the polymer containing the unit derived from the unsaturated carboxylic acid and the unit having an aromatic group is preferably 1 to 95% by mass, and more preferably 5 to 50% by mass. preferable.
When the polymer (CI) contains units derived from an unsaturated carboxylic acid in an amount within the above range, the solubility of the photosensitive composition in the developer and the flexibility of the resist pattern to be formed Easy to balance.

(Polymer containing unit having phenolic hydroxyl group (C-II))
As described above, a polymer containing a unit having a phenolic hydroxyl group is also preferably used as the (C) alkali-soluble resin.
Examples of the monomer that provides a unit having a phenolic hydroxyl group include hydroxyphenyl (meth) acrylate and hydroxystyrene or a hydroxystyrene derivative.

  Specific examples of hydroxyphenyl (meth) acrylate include 4-hydroxyphenyl (meth) acrylate, 3-hydroxyphenyl (meth) acrylate, and 2-hydroxyphenyl (meth) acrylate. 4-hydroxyphenyl (meth) acrylate Is preferred.

  Preferable examples of hydroxystyrene or hydroxystyrene derivative include hydroxystyrene, α-methylhydroxystyrene, α-ethylhydroxystyrene and the like. These preferred hydroxystyrenes or hydroxystyrene derivatives may be para-substituted, meta-substituted, or ortho-substituted, and are preferably para-substituted. Of the hydroxystyrene or hydroxystyrene derivatives, p-hydroxystyrene is preferred.

  The hydroxystyrene resin may contain various units in addition to the units derived from hydroxystyrene or hydroxystyrene derivatives. The unit other than the unit derived from hydroxystyrene or the hydroxystyrene derivative may be a unit derived from various monomers described for the (C) alkali-soluble resin containing a unit derived from an unsaturated carboxylic acid.

(Meth) acrylic acid ester is mentioned as a suitable example of the monomer which gives units other than the unit derived from hydroxystyrene or the hydroxystyrene derivative which the hydroxystyrene resin may contain.
Suitable examples of (meth) acrylic acid esters include linear or methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, amyl (meth) acrylate, t-octyl (meth) acrylate, and the like. Branched alkyl (meth) acrylate; phenyl (meth) acrylate, 4-methylphenyl (meth) acrylate, 3-methylphenyl (meth) acrylate, 2-methylphenyl (meth) acrylate, naphthalen-1-yl (meth) ) Aromatic compounds having no hydroxyl group such as acrylate, naphthalen-2-yl (meth) acrylate, 4-phenylphenyl (meth) acrylate, 3-phenylphenyl (meth) acrylate, and 2-phenylphenyl (meth) acrylate ( Meth) acrylate; benze Aralkyl (meth) acrylates such as (meth) acrylate and phenethyl (meth) acrylate; chloroethyl (meth) acrylate, 2,2-dimethylhydroxypropyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, trimethylolpropane Mono (meth) acrylate, benzyl (meth) acrylate, and furfuryl (meth) acrylate; (meth) acrylic acid ester having a group having an epoxy group; (meth) acrylic acid ester having a group having an alicyclic skeleton It is done.

The amount of the unit having a phenolic hydroxyl group in the polymer containing the unit having a phenolic hydroxyl group is preferably from 5 to 95% by mass, more preferably from 10 to 93% by mass, particularly preferably from 20 to 90% by mass, and from 50 to 50%. 85% by mass is most preferred.
When the content of the unit having a phenolic hydroxyl group in the polymer (C-II) is 5% by mass or more, it is easy to form a resist pattern having good heat resistance and shape.
Further, if the content of the unit having a phenolic hydroxyl group in the polymer (C-II) is more than 95% by mass, the formed resist pattern may have too high rigidity. If the resist pattern is too rigid, cracks are likely to occur.
The problem that cracks are likely to occur due to the excessive content of the unit having a phenolic hydroxyl group is that the polymer (C-II) has only a small amount (for example, less than 5% by mass) of units that impart flexibility to the resin. Notable or notable when not included.
Examples of the unit that imparts flexibility include a unit derived from an unsaturated carboxylic acid such as (meth) acrylic acid, a unit derived from a linear or branched alkyl (meth) acrylate, and an alicyclic skeleton. It is 1 or more types selected from the group which consists of a unit derived from the (meth) acrylic acid ester which has a group to have.

The polymer containing a unit having a phenolic hydroxyl group is derived from a (meth) acrylic acid ester having a unit derived from a linear or branched alkyl (meth) acrylate and / or a group having an alicyclic skeleton. It is preferable that a unit derived from a linear or branched alkyl (meth) acrylate and a unit derived from a (meth) acrylate ester having a group having an alicyclic skeleton are included. More preferred.
The polymer containing a unit having a phenolic hydroxyl group is derived from a (meth) acrylic acid ester having a unit derived from a linear or branched alkyl (meth) acrylate and / or a group having an alicyclic skeleton. When the unit to include is included, since the flexibility of resin increases, there exists an effect which prevents a crack, and is preferable.
In a polymer containing a unit having a phenolic hydroxyl group, the content of a unit derived from a linear or branched alkyl (meth) acrylate and a (meth) acrylic acid ester having a group having an alicyclic skeleton The content of the derived unit is preferably 1 to 50% by mass, more preferably 5 to 40% by mass, and particularly preferably 10 to 30% by mass.

  (C) The mass average molecular weight of the alkali-soluble resin (Mw: measured value by gel permeation chromatography (GPC) in terms of polystyrene. The same applies in this specification) is preferably 2000 to 200000, and 2000 to 40000. It is more preferable. By setting it as the above range, there is a tendency that the film forming ability of the photosensitive composition and the developability after exposure are easily balanced.

  The content of the (C) alkali-soluble resin in the photosensitive composition is preferably 15 to 95% by mass, more preferably 35 to 85% by mass, and particularly preferably 50 to 70% by mass in the solid content of the photosensitive composition. preferable.

<Other ingredients>
The photosensitive composition may contain various additives as needed. Specifically, solvents, sensitizers, curing accelerators, photocrosslinkers, photosensitizers, dispersion aids, fillers, adhesion promoters, antioxidants, UV absorbers, anti-aggregation agents, and thermal polymerization are prohibited Examples include agents, antifoaming agents, surfactants, colorants and the like.

  Examples of the solvent used in the photosensitive composition include ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol-n-propyl ether, ethylene glycol mono-n-butyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, Diethylene glycol mono-n-propyl ether, diethylene glycol mono-n-butyl ether, triethylene glycol monomethyl ether, triethylene glycol monoethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol mono-n-propyl ether, propylene glycol Mono-n-butyl ether, dipropylene glycol mono (Poly) alkylene glycol monoalkyl ethers such as chill ether, dipropylene glycol monoethyl ether, dipropylene glycol mono-n-propyl ether, dipropylene glycol mono-n-butyl ether, tripropylene glycol monomethyl ether, tripropylene glycol monoethyl ether (Poly) alkylene glycol monoalkyl ether acetates such as ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, diethylene glycol monomethyl ether acetate, diethylene glycol monoethyl ether acetate, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate ; Other ethers such as glycol dimethyl ether, diethylene glycol methyl ethyl ether, diethylene glycol diethyl ether, and tetrahydrofuran; ketones such as methyl ethyl ketone, cyclohexanone, 2-heptanone, and 3-heptanone; methyl 2-hydroxypropionate, ethyl 2-hydroxypropionate, etc. Alkyl 2-lactic acid esters; ethyl 2-hydroxy-2-methylpropionate, methyl 3-methoxypropionate, ethyl 3-methoxypropionate, methyl 3-ethoxypropionate, ethyl 3-ethoxypropionate, ethyl ethoxyacetate, hydroxy Ethyl acetate, methyl 2-hydroxy-3-methylbutanoate, 3-methoxybutyl acetate, 3-methyl-3-methoxybutyl acetate, 3-methyl-3 -Methoxybutyl propionate, ethyl acetate, n-propyl acetate, isopropyl acetate, n-butyl acetate, isobutyl acetate, n-pentyl formate, isopentyl acetate, n-butyl propionate, ethyl butyrate, n-propyl butyrate, isopropyl butyrate , Other esters such as n-butyl butyrate, methyl pyruvate, ethyl pyruvate, n-propyl pyruvate, methyl acetoacetate, ethyl acetoacetate and ethyl 2-oxobutanoate; aromatic hydrocarbons such as toluene and xylene Amides such as N-methylpyrrolidone, N, N-dimethylformamide, and N, N-dimethylacetamide; These solvents may be used alone or in combination of two or more.

  Among the above solvents, propylene glycol monomethyl ether, ethylene glycol monomethyl ether acetate, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, diethylene glycol dimethyl ether, diethylene glycol methyl ethyl ether, cyclohexanone, and 3-methoxybutyl acetate are the above-mentioned (A ) Component, (B) component, and (C) component because they exhibit excellent solubility, and it is particularly preferable to use propylene glycol monomethyl ether acetate or 3-methoxybutyl acetate. Although the usage-amount of a solvent should just be determined suitably according to the use of a photosensitive composition, about 50-900 mass parts is mentioned with respect to a total of 100 mass parts of solid content of a photosensitive composition as an example. .

  Examples of the thermal polymerization inhibitor used in the photosensitive composition include hydroquinone and hydroquinone monoethyl ether. Further, examples of the antifoaming agent include compounds such as silicone and fluorine, and examples of the surfactant include compounds such as anion, cation and nonion.

<Method for preparing photosensitive composition>
The photosensitive composition is prepared by mixing and stirring the above-mentioned components by a usual method. Examples of the apparatus that can be used for mixing and stirring the above components include a dissolver, a homogenizer, and a three-roll mill. After the above components are uniformly mixed, the obtained mixture may be further filtered using a mesh, a membrane filter or the like.

≪Method for forming patterned cured film≫
A method for forming a patterned cured film (resist pattern) includes laminating a photosensitive layer made of the photosensitive composition described above on a metal surface of a substrate having a metal surface, and exposing the photosensitive layer. And developing the exposed photosensitive layer.
The thickness of the photosensitive layer is 80 μm or more.
A resist pattern is formed using the photosensitive layer having such a thickness, and plating is performed using the formed resist pattern as a mold for manufacturing a plated shaped article, whereby bumps or metal posts having a desired size are formed on the substrate. It can be formed on a metal surface.

Hereinafter, various steps included in the method of forming the patterned cured film will be described in order.
Hereinafter, lamination of a photosensitive layer made of a photosensitive composition on a metal surface of a substrate having a metal surface is also referred to as a lamination process.
Exposure to the photosensitive layer formed by the lamination process is also referred to as an exposure process.
The development of the photosensitive layer after exposure is also referred to as a development process.

<Lamination process>
In the laminating step, a photosensitive layer made of the above-described photosensitive composition is laminated on the metal surface of the substrate having a metal surface. The thickness of the photosensitive layer is 80 μm or more, preferably 80 to 500 μm, and more preferably 120 to 300 μm.

〔substrate〕
The substrate is not particularly limited, and a conventionally known substrate can be used. For example, a substrate for an electronic component or a substrate on which a predetermined wiring pattern is formed can be exemplified. Examples of the substrate include a metal substrate such as silicon, silicon nitride, titanium, tantalum, palladium, titanium tungsten, copper, chromium, iron, and aluminum, a glass substrate, and the like.
As this board | substrate, what has metal surfaces, such as a wiring pattern, is used. Examples of the metal species constituting the metal surface include copper, solder, chromium, aluminum, nickel, and gold. Copper, gold, and aluminum are preferable, and copper is more preferable.

[Lamination method]
The photosensitive composition demonstrated above is laminated | stacked on the metal surface of the board | substrate which has the above-mentioned metal surface, and a photosensitive layer is formed. The thickness of the photosensitive layer is 80 μm or more, preferably 80 to 500 μm, and more preferably 120 to 300 μm.
The method for laminating the photosensitive layer on the substrate is not particularly limited, but typically, a method of applying the above-mentioned photosensitive composition on the substrate and a dry film formed using the above-mentioned photosensitive composition. The method of laminating | stacking on a board | substrate is mentioned.
Hereinafter, application | coating and lamination | stacking of a dry film are demonstrated.

[Application]
As a coating method of the photosensitive composition on the substrate, a spin coating method, a slit coating method, a roll coating method, a screen printing method, an applicator method, or the like can be employed.
When it is difficult to form a photosensitive layer having a desired film thickness by a single application, the photosensitive layer may be formed by performing application a plurality of times twice or more.

  It is preferable to pre-bake the photosensitive layer. Although prebaking conditions change with kinds of each component in a photosensitive composition, a mixture ratio, a coating film thickness, etc., they are 70-170 degreeC normally, Preferably it is 80-150 degreeC, and is about 2 to 60 minutes. When the application is performed a plurality of times, the photosensitive layer may be pre-baked after a plurality of times of application or may be pre-baked after each time of application.

[Dry film]
The photosensitive composition demonstrated above may be used with the form of a dry film. The dry film is produced by forming a photosensitive layer made of the above-described photosensitive composition on a substrate film.

  As a base film, what has a light transmittance is preferable. Specific examples include a polyethylene terephthalate (PET) film, a polypropylene (PP) film, a polyethylene (PE) film, and the like, and a polyethylene terephthalate (PET) film is preferable in terms of excellent balance between light transmittance and breaking strength.

  When forming the photosensitive layer on the base film, using an applicator, bar coater, wire bar coater, roll coater, curtain flow coater, etc., the film thickness after drying on the base film is 80 μm or more, The photosensitive composition is applied and dried so that the thickness is preferably 80 to 500 μm, more preferably 120 to 300 μm.

  In the dry film, a protective film may be further formed on the photosensitive layer. Examples of the protective film include a polyethylene terephthalate (PET) film, a polypropylene (PP) film, and a polyethylene (PE) film.

The photosensitive layer is laminated on the substrate by sticking the dry film described above on the substrate. When it is difficult to prepare or obtain a dry film having a desired film thickness, a plurality of dry films may be attached to a substrate to form a photosensitive layer having a desired film thickness.
Also for the photosensitive layer formed using a dry film, it is preferable to pre-bake the photosensitive layer as in the case of forming the photosensitive layer by coating.

<Exposure process>
Position selection of actinic rays or radiation, for example, ultraviolet rays or visible rays having a wavelength of 300 to 500 nm, through a negative mask capable of forming a pattern of a predetermined shape with respect to the photosensitive layer formed as described above. Irradiation (exposure).

As a radiation source, a low-pressure mercury lamp, a high-pressure mercury lamp, an ultrahigh-pressure mercury lamp, a metal halide lamp, an argon gas laser, or the like can be used. The radiation includes microwaves, infrared rays, visible rays, ultraviolet rays, X-rays, γ rays, electron beams, proton beams, neutron beams, ion beams, and the like. The amount of radiation irradiation varies depending on the composition of the photosensitive composition and the film thickness of the photosensitive layer, but is preferably about 100 to 1000 mJ / cm ² , for example.
Since the above-mentioned photosensitive composition is excellent in sensitivity, it is easy to form a resist pattern having a desired shape with a low exposure amount even if the photosensitive layer is thick.

<Development process>
The exposed photosensitive layer is developed according to a conventionally known method, and insoluble portions are dissolved and removed to form a predetermined resist pattern. The developer is appropriately selected according to the composition of the photosensitive composition. When the photosensitive composition contains an alkali-soluble component such as an alkali-soluble resin, examples of the developer include organic developers such as monoethanolamine, diethanolamine, and triethanolamine, and sodium hydroxide and potassium hydroxide. An aqueous solution of sodium carbonate, ammonia, or a quaternary ammonium salt can be used.

  The development time varies depending on the composition of the photosensitive composition and the film thickness of the photosensitive layer, but is usually 1 to 30 minutes. The developing method may be any of a liquid piling method, a dipping method, a paddle method, a spray developing method, and the like. The development may be performed in a plurality of times while changing the developer.

  After the development, washing with running water is performed for 30 to 90 seconds, and dried using an air gun, an oven, or the like. In this way, a resist pattern can be manufactured.

  In this way, by forming a resist pattern on the metal surface of the substrate having a metal surface using the above-described photosensitive composition according to the above method, even in a thick resist pattern having a thickness of 80 μm or more, the cross-sectional shape Can form a non-resist portion that is a good rectangle.

≪Production method of plated objects≫
The resist pattern described above is preferably used as a mold for forming a plated model. The method for producing a plated model includes plating a mold-equipped substrate provided with the above-described resist pattern as a mold for forming the plated model, and forming the plated model in the mold. That is, a non-resist portion in the resist pattern is filled with metal by plating to form a plated model.

  When forming a substrate with a mold, the aforementioned substrate is used as the substrate. In addition to designing the shape of the non-resist portion in the resist pattern according to the shape of the plated model, the substrate with a mold is manufactured by the same method as the method for forming the patterned cured film described above. .

  By embedding a conductor such as metal in the non-resist portion (portion removed by the developer) in the mold of the substrate with the mold formed by the above method, for example, connection terminals such as bumps and metal posts Such a plated model can be formed. The plating method is not particularly limited, and various conventionally known methods can be employed. As the plating solution, solder plating, copper plating, gold plating, nickel plating solution is particularly preferably used. The remaining mold is finally removed using a stripping solution or the like according to a conventional method.

  In the method for producing a plated model, the plated model is manufactured by using a mold having a non-resist portion having a good rectangular cross-sectional shape, which is formed using the photosensitive composition having the specific composition described above. Therefore, the cross-sectional shape of the obtained plated model is also a good rectangle.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited to these Examples.

<(A) Photopolymerizable compound>
In Examples and Comparative Examples, the following A1 and A2 and A3 which is dipentaerythritol hexaacrylate were used as the (A) photopolymerizable compound (component (A)).

<(B) Polymerization initiator>
In Examples and Comparative Examples, the following B1 to B4 were used as (B) photopolymerization initiator (component (B)).

<(C) Alkali-soluble resin>
In Examples and Comparative Examples, the following C1 to C4 were used as the (C) alkali-soluble resin (component (C)). (C) In the following formula showing the structure of the alkali-soluble resin, the lower right numerical value in parentheses is the content (% by mass) of the unit in the parentheses in the resin.

<(S) Solvent>
In Examples and Comparative Examples, 3-methoxybutyl acetate (MA) and propylene glycol monomethyl ether acetate (PM) were used as the (S) solvent.

[Examples 1-8 and Comparative Examples 1-6]
The component (A) of the type described in Table 1, the component (B) of the type described in Table 1, and the component (C) of the type described in Table 1 so that the solid content concentration becomes 70% by mass. Were dissolved in a solvent (S) of the type shown in Table 1 to obtain photosensitive compositions of Examples and Comparative Examples.
In addition, the usage-amount of (A) component was 60 mass parts, the usage-amount of (B) component was 12 mass parts, and the usage-amount of (C) component was 100 mass parts.
Using the obtained photosensitive composition, the resolution, EOP (optimum exposure necessary for reproducing the mask dimension), and the cross-sectional shape of the non-resist portion in the resist pattern were evaluated according to the following methods.

<Resolution evaluation>
The photosensitive composition of each Example and Comparative Example was applied on a copper substrate using a spin coater to form a photosensitive layer having a thickness capable of forming a resist pattern having a thickness of 120 μm, and prebaked at 120 ° C. for 600 seconds. Further, using the same photosensitive composition on this photosensitive layer, a photosensitive layer having a film thickness capable of forming a 120 μm-thick resist pattern is formed, prebaked at 120 ° C. for 600 seconds, and a resist pattern having a film thickness of 240 μm is formed. A photosensitive layer having a thickness capable of forming a film was formed. After prebaking, the test mask comprising via holes 40,60,80,100μm size, exposure apparatus Prisma GHI (manufactured by Ultratech Co., Ltd.) and using the exposure quantity 100~2000mJ / cm 100mJ / cm ² in the ^second range The exposure was carried out while changing each time. Next, the substrate was placed on a hot plate and post-exposure heating (PEB) was performed at 100 ° C. for 3 minutes. Thereafter, a 2.38% tetramethylammonium hydroxide aqueous solution (NMD-3, manufactured by Tokyo Ohka Kogyo Co., Ltd.) was dropped onto the photosensitive layer, left at 23 ° C. for 60 seconds, and this was repeated 10 times for development. Thereafter, it was washed with running water and blown with nitrogen to obtain a resist pattern having a film thickness of 240 μm.
In addition, about the photosensitive composition of the comparative examples 1 and 2, the photosensitive film | membrane was melt | dissolved excessively at the time of image development, and the resist pattern was not able to be obtained.
Table 1 shows the minimum dimension (μm) of the pattern that can be resolved when the 100 μm size pattern is exposed with the exposure amount printed at 100 μm as the dimension, as the evaluation result of the resolution.

<EOP evaluation>
In the above-described resolution evaluation, the exposure amount (mJ / cm ² ) obtained by printing a 100 μm size pattern to 100 μm according to the dimensions is shown in Table 1 as an EOP evaluation result.

<Evaluation of cross-sectional shape of non-resist part>
A resist pattern having a film thickness of 240 μm was obtained in the same manner as in the resolution evaluation, except that a test mask including a via hole of 100 μm size was used and exposure was performed with the exposure amount of the EOP evaluation result.
In addition, about the photosensitive composition of the comparative examples 1 and 2, the photosensitive film | membrane was melt | dissolved excessively at the time of image development, and the resist pattern was not able to be obtained.
The cross section of the obtained resist pattern was observed with a scanning electron microscope, and for the cross section of the non-resist portion (hole), the size of the opening (top) (TCD (μm)) and the size of the substrate side bottom (bottom) ( BCD (μm)) was measured, and the rectangularity of the cross section of the hole was evaluated according to the following criteria based on the value of TCD / BCD. The closer the value of TCD / BCD is to 1, the better the hole cross-sectional shape is. The evaluation results of the cross-sectional shape of the non-resist portion are shown in Table 1.
A: TCD / BCD value is 0.9 or more and less than 1.2.
Δ: TCD / BCD value is 0.8 or more and less than 0.9.
X: The value of TCD / BCD is less than 0.8.

  According to Examples 1 to 8, the photosensitive composition containing (A) the photopolymerizable compound and the compound represented by formula (1) as the (B) photopolymerization initiator has a resist pattern thickness of 240 μm. It can be seen that a resist pattern having a non-resist portion having a good rectangular cross-sectional shape can be obtained with a low exposure amount even if it is thick.

On the other hand, according to Comparative Examples 1-5, when the photosensitive composition contains (B) a photopolymerization initiator having a structure not included in Formula (1), the resist pattern has a thick film thickness of 240 μm. It can be seen that a resist pattern having a desired shape cannot be formed in the first place, or that it is difficult to form a resist pattern having a non-resist portion having a rectangular cross-sectional shape.
Moreover, according to the comparative example 6, even if the photosensitive resin composition contains the compound represented by Formula (1) as (B) photopolymerization initiator, it has a unit containing an aromatic group (C). It can be seen that when the alkali-soluble resin is not included, it is difficult to form a resist pattern including a non-resist portion having a rectangular shape with a good cross-sectional shape.

[Example 9, Comparative Example 7]
In Example 9, the dry film formed using the photosensitive composition obtained in Example 1 was used for lamination of the photosensitive layer. Specifically, after the photosensitive composition obtained in Example 1 was applied on a PET film with an applicator, the coating film was dried at 100 ° C., and the photosensitive film having a film thickness capable of forming a resist pattern with a film thickness of 120 μm. A layer was formed.
In Comparative Example 7, a dry film formed using the photosensitive composition obtained in Comparative Example 1 was used for lamination of the photosensitive layers. The dry film manufacturing method used in Comparative Example 7 is the same as the dry film manufacturing method used in Example 9.

Using a dry film made of the photosensitive composition obtained in Example 1 or a dry film made of the photosensitive composition obtained in Comparative Example 1, a dry film laminator (EXL-1200HSF1-CE, manufactured by Teikoku Taping Systems Co., Ltd.) ), A photosensitive layer was attached to the surface of the copper sputtered wafer substrate under conditions of a speed of 1 m / min, a pressure of 0.5 MPa (G), a stage temperature of 80 ° C., and a roll temperature of 30 ° C. On the photosensitive layer affixed to the substrate surface, the dry film made of the photosensitive composition obtained in Example 1 or the dry film made of the photosensitive composition obtained in Comparative Example 1 was again subjected to the above method. A photosensitive layer having a thickness capable of forming a resist pattern having a thickness of 240 μm was formed on the substrate.
The photosensitive layer laminated on the substrate was pre-baked at 110 ° C. for 600 seconds.
Thus, using the substrate provided with the pre-baked photosensitive layer formed using the dry film, in the same manner as in Example 1, the evaluation of resolution, the evaluation of EOP, and the cross-sectional shape of the non-resist portion Evaluation and performed.

  As a result, the evaluation result of Example 9 was the same as the evaluation result of Example 1, and the evaluation result of Comparative Example 7 was the same as the evaluation result of Comparative Example 1. From these results, whether the photosensitive layer is formed by coating or using a dry film, it affects the cross-sectional shape of the resist pattern and the exposure amount for forming a resist pattern having a desired shape. It turns out that there is almost no.

[Examples 10 to 12, Comparative Examples 8 to 10, Reference Example 1, and Reference Example 2]
In Reference Example 1 and Examples 10 to 12, the photosensitive composition used in Example 1 was used except that a photosensitive layer having a film thickness for forming the resist pattern shown in Table 2 was formed. A substrate provided with a photosensitive layer prebaked in the same manner as in Example 1 was obtained.
In Example 12, two layers of photosensitivity with a film thickness capable of forming a resist pattern with a film thickness of 150 μm were overcoated to form a photosensitive layer.
In Reference Example 2 and Comparative Examples 8 to 10, the photosensitive composition used in Comparative Example 4 was used except that a photosensitive layer having a film thickness for forming the resist pattern shown in Table 2 was formed. A substrate provided with a photosensitive layer prebaked in the same manner as in Example 1 was obtained.
In Comparative Example 10, two photosensitive layers having a film thickness capable of forming a resist pattern having a film thickness of 150 μm were overcoated to form a photosensitive layer.

  Using the substrate provided with the pre-baked photosensitive layer obtained in each example, comparative example, and reference example, in the same manner as in Example 1, resolution evaluation, EOP evaluation, and non-resist portion The cross-sectional shape was evaluated. These evaluation results are shown in Table 2.

  According to Reference Example 1, Example 1, and Examples 10 to 12, photosensitivity containing (A) a photopolymerizable compound and a compound represented by formula (1) as (B) a photopolymerization initiator. The composition can form a resist pattern having a non-resist portion having a good rectangular cross-sectional shape with a low exposure amount even when the thickness of the resist pattern is changed in a range of 40 μm or more, particularly in a range of 80 μm or more. I understand.

  On the other hand, according to Reference Example 2, Comparative Example 4, and Comparative Examples 8 to 10, the photosensitive composition containing (B) a photopolymerization initiator having a structure not included in Formula (1) has a film thickness. It can be seen that even when a resist pattern having a non-resist portion having a good rectangular cross-sectional shape can be formed when it is relatively thin (for example, 80 μm or less), a high exposure amount is necessary. In addition, when the film thickness is relatively thick (for example, 120 μm or more), a resist pattern having a desired shape cannot be formed in the first place, or it is difficult to form a resist pattern including a non-resist portion having a good cross-sectional shape. I understand that

Claims (9)

(A) a photopolymerizable compound, (B) a photopolymerization initiator, and (C) an alkali-soluble resin,
The (B) photopolymerization initiator is represented by the following formula (1):

(R ¹ is a hydrogen atom, a nitro group or a monovalent organic group, and R ² and R ³ are each a chain alkyl group which may have a substituent, or a cyclic which may have a substituent. R ² and R ³ may be bonded to each other to form a ring, R ⁴ is a monovalent organic group, and R ⁵ is a hydrogen atom or a substituent. An alkyl group having 1 to 11 carbon atoms which may have an aryl group which may have a substituent, n is an integer of 0 to 4, and m is 0 or 1.)
Including a compound represented by
The photosensitive composition in which the (C) alkali-soluble resin is a polymer of a monomer having an unsaturated double bond and includes a unit derived from a monomer having an aromatic group.   The photosensitive composition of Claim 1 in which the said (A) photopolymerizable compound contains a bifunctional photopolymerizable compound.   The photosensitive composition of Claim 1 or 2 whose ratio of the unit derived from the monomer which has an aromatic group with respect to the total mass of said (C) alkali-soluble resin is 30-95 mass%.   The photosensitive composition of any one of Claims 1-3 used for formation of the patterned cured film 80 micrometers or more in thickness.   The dry film which consists of a photosensitive composition of any one of Claims 1-4. A method of forming a patterned cured film, comprising:
Laminating a photosensitive layer made of the photosensitive composition according to any one of claims 1 to 4 on the metal surface of a substrate having a metal surface;
Exposing the photosensitive layer;
Developing the photosensitive layer after exposure,
The method, wherein the photosensitive layer has a thickness of 80 μm or more.   The method according to claim 6, wherein the photosensitive layer is laminated on the metal surface using the dry film according to claim 5.   The method according to claim 6 or 7, wherein the patterned cured film is a mold for forming a plated model.   A method for producing a plated model, comprising: plating the substrate including the mold formed by the method according to claim 8 to form a plated model in the mold.