JP6134187B2 - Black photosensitive resin composition and use thereof - Google Patents

Description

  The present invention relates to a black photosensitive resin composition, a resin film obtained therefrom, an insulating film, and a printed wiring board with an insulating film.

  Polyimide resins are widely used in electrical and electronic applications because of their excellent heat resistance, electrical insulation reliability, chemical resistance, and mechanical properties. For example, it is used to form insulating films and protective coatings on semiconductor devices, base materials such as flexible circuit boards and integrated circuits, surface protective materials, and further, interlayer insulating films and protective films for fine circuits. .

  In particular, when used as a surface protection material for a flexible circuit board, a coverlay film obtained by applying an adhesive to a molded body such as a polyimide film has been used. When bonding this coverlay film on a flexible circuit board, there is a method in which an opening is provided in advance by a method such as punching in a terminal portion of a circuit or a joint portion with a component, and after aligning, a method of thermocompression bonding by a hot press or the like is used. It is common.

  However, it is difficult to provide a high-accuracy opening in a thin coverlay film, and since the alignment at the time of lamination is often performed manually, the positional accuracy is poor and the workability of the lamination is also poor. The cost was high.

  On the other hand, a solder resist or the like may be used as a surface protection material for a circuit board. In particular, a solder resist having a photosensitive function is preferably used when fine processing is required. As this photosensitive solder resist, a photosensitive resin composition mainly composed of acid-modified epoxy acrylate, epoxy resin, or the like is used. This photosensitive solder resist is excellent in electrical insulation reliability as an insulating material, but is bent. Therefore, when it is laminated on a thin and flexible circuit board such as a flexible circuit board, the warpage of the board becomes large and it is difficult to use it for a flexible circuit board.

  In recent years, cover pattern films and photosensitive solder resists, which are surface protection materials for circuit boards, are colored black to conceal them, thereby concealing circuit patterns and protecting confidential information contained in circuit patterns. Attempts have been made.

  Particularly in the case of a photosensitive solder resist, it is important to make the photosensitivity, flexibility, heat resistance, plating resistance, blackness and hiding properties compatible, and various proposals that can manifest these characteristics have been made.

  For example, a black photo solder resist that has sufficient blackness and excellent resolution is proposed (see, for example, Patent Documents 1 and 2).

JP 2008-257045 A JP 2010-091876 A

  However, although Patent Document 1 is excellent in resolution and blackness, there is a concern in electrical insulation reliability because carbon black is used as a black colorant. Therefore, Patent Document 2 uses black as a black colorant in combination with an organic colorant instead of carbon black, which ensures electrical insulation reliability more than when carbon black is used, and shows resolution and blackness. ing. However, in order to ensure a certain degree of blackness, the amount of organic colorant added increases, and there are concerns about clogging during ink filtration and deterioration of screen printability.

  As a result of intensive studies to solve the above problems, the present inventors have at least (A) a binder polymer, (B) an organic colorant, (C) a thermosetting resin, (D) a radical polymerizable compound, and (E ) A black photosensitive resin composition comprising a photopolymerization initiator, wherein the photosensitive resin composition has a thixotropic index of 1.1 to 3.5, and the black photosensitive resin composition is cured. The L * value of the resulting insulating film is 25 or less, so that clogging at the time of ink filtration is suppressed, and the knowledge that a black photosensitive resin composition showing excellent screen properties can be obtained has been obtained. The present invention has been achieved based on the findings. This invention can solve the said subject with the black photosensitive resin composition of the following novel structures.

  That is, the present invention relates to a black photosensitive material comprising at least (A) a binder polymer, (B) an organic colorant, (C) a thermosetting resin, (D) a radical polymerizable compound, and (E) a photopolymerization initiator. L * value of an insulating film obtained by curing the black photosensitive resin composition, wherein the thixotropic index of the photosensitive resin composition is 1.1 to 3.5. Is a photosensitive resin composition having 25 or less. Furthermore, it is more preferable that at least one of the components (B) contains a copper phthalocyanine-based blue colorant.

  Moreover, the resin film concerning this invention is obtained by drying, after apply | coating the said black photosensitive resin composition to the base-material surface.

  The insulating film according to the present invention is obtained by curing the resin film.

  The printed wiring board with an insulating film according to the present invention is formed by coating the insulating film on a printed wiring board or a flexible printed wiring board.

  A black photosensitive resin composition comprising at least (A) a binder polymer, (B) an organic colorant, (C) a thermosetting resin, (D) a radical polymerizable compound, and (E) a photopolymerization initiator. The thixotropic index of the photosensitive resin composition is 1.1 to 3.5, and the L * value of the insulating film obtained by curing the black photosensitive resin composition is 25 or less. The black photosensitive resin composition of the present invention exhibits excellent screen printability while clogging during ink filtration is suppressed. Therefore, the black photosensitive resin composition of the present invention can be used for protective films of various circuit boards and exhibits excellent effects.

  The present invention will be described in detail below.

  The black photosensitive resin composition of the present invention is at least (A) a binder polymer, (B) an organic colorant, (C) a thermosetting resin, (D) a radical polymerizable compound, and (E) initiation of photopolymerization. A black photosensitive resin composition comprising an agent, wherein the photosensitive resin composition has a thixotropic index of 1.1 to 3.5, and is obtained by curing the black photosensitive resin composition. The L * value of the insulating film may be 25 or less.

  Here, although the present inventors discovered that the black photosensitive resin composition of this invention was excellent in various characteristics, it estimates that this may be based on the following reasons. Common black colorants include carbon black, but there is concern about the insulation of the colorant itself. Therefore, it is used to express black color by mixing organic colorants that are complementary colors from the point that the colorant itself has insulating properties and deep photocurability when used as a photosensitive material. It is done. However, in order to ensure a certain degree of blackness, the amount of organic pigment added increased, resulting in clogging during ink filtration and deterioration of screen printability. The said subject is a subject newly discovered when this inventor earnestly researched the black photosensitive resin composition. Therefore, as a result of earnest research, I found out that thixotropics and blackness are related. Therefore, it is presumed from the relationship between thixotropy tropics and blackness that clogging during ink filtration is suppressed and printability is improved by showing the optimal thixotropy tropics and blackness. .

  Hereinafter, at least (A) binder polymer, (B) organic colorant, (C) thermosetting resin, (D) radical polymerizable compound, (E) photopolymerization initiator, other components, and black photosensitive resin A method for mixing the composition will be described.

<(A) Binder polymer>
The (A) binder polymer of the present invention is a polymer that is soluble in an organic solvent and has a weight average molecular weight of 1,000 or more and 1,000,000 or less in terms of polyethylene glycol.

  Examples of the organic solvent include, but are not limited to, sulfoxide solvents such as dimethyl sulfoxide and diethyl sulfoxide, N, N-dimethylformamide, formamide solvents such as N, N-diethylformamide, N, N-dimethylacetamide, Examples thereof include acetamide solvents such as N, N-diethylacetamide, pyrrolidone solvents such as N-methyl-2-pyrrolidone and N-vinyl-2-pyrrolidone, hexamethylphosphoramide, and γ-butyrolactone. Further, if necessary, these organic polar solvents can be used in combination with an aromatic hydrocarbon such as xylene or toluene.

  Furthermore, for example, methyl monoglyme (1,2-dimethoxyethane), methyldiglyme (bis (2-methoxyether) ether), methyltriglyme (1,2-bis (2-methoxyethoxy) ethane), methyltetraglyme (Bis [2- (2-methoxyethoxyethyl)] ether), ethyl monoglyme (1,2-diethoxyethane), ethyldiglyme (bis (2-ethoxyethyl) ether), butyldiglyme (bis (2 Symmetric glycol diethers such as -butoxyethyl) ether), methyl acetate, ethyl acetate, isopropyl acetate, n-propyl acetate, butyl acetate, propylene glycol monomethyl ether acetate, ethylene glycol monobutyl ether acetate, diethylene glycol monoethyl ether Cetate (aka carbitol acetate, 2- (2-butoxyethoxy) ethyl acetate)), diethylene glycol monobutyl ether acetate, 3-methoxybutyl acetate, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, dipropylene glycol methyl ether Acetates such as acetate, propylene glycol diacetate, 1,3-butylene glycol diacetate, dipropylene glycol methyl ether, tripropylene glycol methyl ether, propylene glycol n-propyl ether, dipropylene glycol n-propyl ether, propylene glycol n-butyl ether, dipropylene glycol n-butyl ether, tripylene glycol n Propyl ether, propylene glycol phenyl ether, dipropylene glycol dimethyl ether, 1,3-dioxolane, ethylene glycol monobutyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, ethers such solvents such as ethyl ether also ethylene glycol.

  The solubility of the organic solvent, which is an index that becomes soluble in the organic solvent, can be measured as parts by weight of the base polymer dissolved in 100 parts by weight of the organic solvent, and is soluble in 100 parts by weight of the organic solvent. If the weight part of the base polymer is 5 parts by weight or more, it can be made soluble in an organic solvent. The organic solvent solubility measurement method is not particularly limited. For example, 5 parts by weight of the base polymer is added to 100 parts by weight of the organic solvent, stirred at 40 ° C. for 1 hour, cooled to room temperature, and left for 24 hours or longer. It can be measured by a method for confirming that the solution is uniform without generation of insoluble matter or precipitates.

  The weight average molecular weight of the component (A) of the present invention can be measured, for example, by the following method.

(Weight average molecular weight measurement)
Equipment used: Tosoh HLC-8220GPC equivalent column: Tosoh TSK gel Super AWM-H (6.0 mm ID x 15 cm) x 2 guard columns: Tosoh TSK guard column Super AW-H
Eluent: 30 mM LiBr + 20 mM H3PO4 in DMF
Flow rate: 0.6 mL / min
Column temperature: 40 ° C
Detection conditions: RI: Polarity (+), response (0.5 sec)
Sample concentration: about 5 mg / mL
Standard product: PEG (polyethylene glycol).

  Controlling the weight average molecular weight within the above range is preferable because the resulting insulating film has excellent flexibility and chemical resistance. When the weight average molecular weight is 1,000 or less, the flexibility and chemical resistance may be lowered. When the weight average molecular weight is 1,000,000 or more, the viscosity of the black photosensitive resin composition is increased. There is.

  The component (A) of the present invention is not particularly limited. For example, polyurethane resin, poly (meth) acrylic resin, polyvinyl resin, polystyrene resin, polyethylene resin, polypropylene resin, polyimide resin, polyamide resin, for example. Resin, polyacetal resin, polycarbonate resin, polyester resin, polyphenylene ether resin, polyphenylene sulfide resin, polyether sulfone resin, polyether ether ketone resin, and the like. These may be used alone or in combination of two or more. Can be used in combination. In particular, when a polyurethane resin or poly (meth) acrylic resin, which is a resin containing a urethane bond in the molecule, is used, the flexibility and fold resistance of the insulating film obtained by curing the black photosensitive resin composition Is improved, and the warp of the insulating film is reduced, which is preferable.

  The resin containing a urethane bond in the molecule of the present invention is soluble in an organic solvent, contains a repeating unit containing at least one urethane bond in the molecule, and has a weight average molecular weight of polyethylene glycol It is a polymer of 1,000 to 1,000,000 in terms of conversion.

  Although the resin containing a urethane bond in the molecule of the present invention can be obtained by any reaction, for example, the following general formula (1)

(Wherein R ₁ represents a divalent organic group)
A diol compound represented by the following general formula (2)

(Wherein X ₁ represents a divalent organic group)
By reacting the diisocyanate compound represented by the following general formula (3)

(Wherein R ₁ and X ₁ each independently represent a divalent organic group, and n represents an integer of 1 or more)
It is obtained as a structure containing a repeating unit containing a urethane bond represented by

  The diol compound of the present invention is not particularly limited as long as it has the above structure. For example, ethylene glycol, diethylene glycol, propylene glycol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, neo Pentyl glycol, 3-methyl-1,5-pentanediol, 1,6-hexanediol, 1,8-octanediol, 2-methyl-1,8-octanediol, 1,9-nonanediol, 1,10-decane Polyoxya such as diol, alkylene diol such as 1,4-cyclohexanediol, 1,4-cyclohexanedimethanol, polyethylene glycol, polypropylene glycol, polytetramethylene glycol, and a random copolymer of tetramethylene glycol and neopentyl glycol Ring-opening addition reaction of lactones such as xylene diol, polyester diol obtained by reacting polyhydric alcohol and polybasic acid, polycarbonate diol having carbonate skeleton, γ-butyllactone, ε-caprolactone, δ-valerolactone Polycaprolactone diol, bisphenol A, ethylene oxide adduct of bisphenol A, propylene oxide adduct of bisphenol A, hydrogenated bisphenol A, ethylene oxide adduct of hydrogenated bisphenol A, propylene oxide addition of hydrogenated bisphenol A The thing etc. are mentioned, These can be used individually or in combination of 2 or more types.

  In particular, when a long-chain diol such as polyethylene glycol, polypropylene glycol, polytetramethylene glycol, polyoxyalkylene diol, polyester diol, polycarbonate diol, or polycaprolactone diol is used, it is obtained by curing the black photosensitive resin composition. This is preferable in that the elastic modulus of the insulating film is lowered and the flexibility and low warpage are excellent.

  The diisocyanate compound of the present invention is not particularly limited as long as it has the above structure. For example, diphenylmethane-2,4'-diisocyanate, 3,2'- or 3,3'- or 4,2'- or 4,3 '-Or 5,2'- or 5,3'- or 6,2'- or 6,3'-dimethyldiphenylmethane-2,4'-diisocyanate, 3,2'- or 3,3'- or 4, 2'- or 4,3'- or 5,2'- or 5,3'- or 6,2'- or 6,3'-diethyldiphenylmethane-2,4'-diisocyanate, 3,2'- or 3 , 3'- or 4,2'- or 4,3'- or 5,2'- or 5,3'- or 6,2'- or 6,3'-dimethoxydiphenylmethane-2,4'-diisocyanate, Diphenylmethane-4,4'-diisocyanate, diph Nylmethane-3,3'-diisocyanate, diphenylmethane-3,4'-diisocyanate, diphenylether-4,4'-diisocyanate, benzophenone-4,4'-diisocyanate, diphenylsulfone-4,4'-diisocyanate, tolylene-2, 4-diisocyanate, tolylene-2,6-diisocyanate, m-xylylene diisocyanate, p-xylylene diisocyanate, naphthalene-2,6-diisocyanate, 4,4 '-[2,2-bis (4-phenoxyphenyl) propane Aromatic diisocyanates such as diisocyanates, hydrogenated diphenylmethane diisocyanate, hydrogenated xylylene diisocyanate, isophorone diisocyanate, norbornene diisocyanate Compounds, hexamethylene diisocyanate, trimethylhexamethylene diisocyanate, aliphatic diisocyanate compounds such lysine diisocyanate, etc. These can be used alone or in combinations of two or more.

  In particular, when an alicyclic diisocyanate and an aliphatic diisocyanate compound are used, it is preferable in terms of excellent photosensitivity of the black photosensitive resin composition.

  In the method of synthesizing a resin containing a urethane bond in the molecule of the present invention, the blending amount of the diol compound and the diisocyanate compound is such that the ratio of the number of hydroxyl groups to the number of isocyanate groups is isocyanate group / hydroxyl group = 0.5 or more and 2.0. It mix | blends so that it may become the following, and it is obtained by making it react in a solvent-free or organic solvent.

  Moreover, when using 2 or more types of diol compounds, reaction with a diisocyanate compound may be performed after mixing 2 or more types of diol compounds, or each diol compound and diisocyanate compound may be made to react separately. Good. Moreover, after making a diol compound and a diisocyanate compound react, you may make the obtained terminal isocyanate compound react with another diol compound, and also make this react with a diisocyanate compound. The same applies when two or more types of diisocyanate compounds are used. In this way, a resin containing a urethane bond in a desired molecule can be produced.

  The reaction temperature between the diol compound and the diisocyanate compound is preferably 40 to 160 ° C, and more preferably 60 to 150 ° C. If it is less than 40 ° C., the reaction time becomes too long. If it exceeds 160 ° C., a three-dimensional reaction occurs during the reaction and gelation tends to occur. The reaction time can be appropriately selected depending on the scale of the batch and the reaction conditions employed. If necessary, the reaction may be performed in the presence of a catalyst such as a tertiary amine, an alkali metal, an alkaline earth metal, a metal such as tin, zinc, titanium, cobalt, or a metalloid compound.

  The above reaction can be carried out without solvent, but it is desirable to carry out the reaction in an organic solvent system in order to control the reaction. Although the organic solvent used here is not specifically limited, For example, what was illustrated above can be used.

  The amount of the organic solvent used in the reaction is desirably such that the solute weight concentration in the reaction solution, that is, the solution concentration is 5% by weight or more and 90% by weight or less. The solute weight concentration in the reaction solution is more preferably 10 wt% or more and 80 wt% or less. When the solution concentration is 5% or less, the polymerization reaction is difficult to occur, the reaction rate is lowered, and a desired structural substance may not be obtained.

  The resin containing a urethane bond in the molecule of the present invention preferably further contains at least one organic group selected from the group consisting of a (meth) acryloyl group, a carboxyl group and an imide group. The (meth) acryloyl group is an acryloyl group and / or a methacryloyl group. When the (meth) acryloyl group is contained, the photosensitivity of the black photosensitive resin composition is improved, so that it can be irradiated with ultraviolet rays in a short time. It can be cured. Moreover, since the solubility to the developing solution of the dilute alkaline aqueous solution of a black photosensitive resin composition improves when it contains a carboxyl group, a fine pattern can be formed by development in a short time. In addition, when it contains an imide group, the heat resistance of the black photosensitive resin composition and the electrical insulation reliability under high temperature and high humidity conditions are improved. A printed wiring board is obtained.

  Here, a resin containing a urethane bond in a molecule containing a (meth) acryloyl group can be obtained by any reaction. For example, in addition to the diol compound and the diisocyanate compound, the following general formula (4)

(In the formula, R ₂ represents an m + 1 valent organic group, R ₃ represents hydrogen or an alkyl group, and m represents an integer of 1 to 3)
And / or a compound containing at least one (meth) acryloyl group and / or the following general formula (5)

(Wherein X ₂ represents an l + 1 valent organic group, X ₃ represents hydrogen or an alkyl group, and l represents an integer of 1 to 3)
It is obtained by reacting a compound containing an isocyanate group represented by the formula (1) and at least one (meth) acryloyl group.

  The compound containing a hydroxyl group and at least one (meth) acryloyl group of the present invention is not particularly limited as long as it has the above structure. For example, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 2-hydroxybutyl (meth) acrylate, 2-hydroxy-3-phenoxypropyl (meth) acrylate, 2-hydroxy-1-acryloxy-3-methacryloxypropane, o-phenylphenol glycidyl ether (meth) acrylate, polyethylene glycol mono (Meth) acrylate, pentaerythritol tri (meth) acrylate, tris (2-hydroxyethyl) isocyanurate di (meth) acrylate, 1,4-cyclohexanedimethanol mono (meth) acrylate, 4-hy Roxyphenyl (meth) acrylate, 2- (4-hydroxyphenyl) ethyl (meth) acrylate, N-methylol acrylamide, 3,5-dimethyl-4-hydroxybenzyl acrylamide, etc. may be mentioned, and these may be used alone or in combination of two or more. Can be used in combination.

  The compound containing an isocyanate group and at least one (meth) acryloyl group of the present invention is not particularly limited as long as it has the above structure. For example, 2- (meth) acryloyloxyethyl isocyanate, 1,1- (bisacryloyl) And oxymethyl) ethyl isocyanate, 2- (2-methacryloyloxyethyloxy) ethyl isocyanate, and the like. These can be used alone or in combination of two or more.

  In addition, a resin containing a urethane bond in the molecule containing a carboxyl group can be obtained by any reaction. For example, in addition to the diol compound and the diisocyanate compound, the following general formula (6)

(Wherein R ₄ represents a trivalent organic group)
It can be obtained by reacting a compound containing two hydroxyl groups and one carboxyl group.

  The compound containing two hydroxyl groups and one carboxyl group of the present invention is not particularly limited as long as it has the above structure. For example, 2,2-bis (hydroxymethyl) propionic acid, 2,2-bis (2- Hydroxyethyl) propionic acid, 2,2-bis (3-hydroxymepropyl) propionic acid, 2,3-dihydroxy-2-methylpropionic acid, 2,2-bis (hydroxymethyl) butanoic acid, 2,2-bis (2-hydroxyethyl) butanoic acid, 2,2-bis (3-hydroxypropyl) butanoic acid, 2,3-dihydroxybutanoic acid, 2,4-dihydroxy-3,3-dimethylbutanoic acid, 2,3-dihydroxy Hexadecanoic acid, 2,3-dihydroxybenzoic acid, 2,4-dihydroxybenzoic acid, 2,5-dihydroxybenzoic acid, 2,6-dihydroxy Benzoic acid, 3,4-dihydroxybenzoic acid, 3,5-dihydroxybenzoic acid, etc. These can be used alone or in combinations of two or more.

  In particular, when a compound containing two aliphatic hydroxyl groups and one carboxyl group is used, it is preferable in terms of excellent photosensitivity of the black photosensitive resin composition.

  In addition, a resin containing a urethane bond in a molecule containing an imide group can be obtained by any reaction. For example, in addition to the diol compound and the diisocyanate compound, the following general formula (7)

(Wherein Y represents a tetravalent organic group)
It is obtained by reacting a tetracarboxylic dianhydride represented by

  The tetracarboxylic dianhydride of the present invention is not particularly limited as long as it has the above structure. For example, 3,3 ′, 4,4′-benzophenonetetracarboxylic dianhydride, pyromellitic dianhydride, 3 , 3 ′, 4,4′-oxydiphthalic dianhydride, 2,2-bis [4- (3,4-dicarboxyphenoxy) phenyl] propane dianhydride, 2,2-bis (4-hydroxyphenyl) Propane dibenzoate-3,3 ′, 4,4′-tetracarboxylic dianhydride, 3,3 ′, 4,4′-diphenylsulfone tetracarboxylic dianhydride, 3,3 ′, 4,4′- Biphenyltetracarboxylic dianhydride, 2,3,3 ′, 4-biphenyltetracarboxylic dianhydride, 5- (2,5-dioxotetrahydro-3-furanyl) -3-methyl-3-cyclohexene-1 , 2-Dicarboxylic Tetracarboxylic acid dianhydride anhydrides, etc. These can be used alone or in combinations of two or more.

  The poly (meth) acrylic resin of the present invention is soluble in an organic solvent and contains repeating units obtained by copolymerizing (meth) acrylic acid and / or (meth) acrylic acid ester derivatives. The polymer has a weight average molecular weight of 1,000 or more and 1,000,000 or less in terms of polyethylene glycol. Here, (meth) acryl is methacryl and / or acrylic.

  The poly (meth) acrylic resin of the present invention can be obtained by any reaction. For example, a (meth) acrylic acid and / or a (meth) acrylic ester derivative is present in a solvent in the presence of a radical polymerization initiator. Obtained by reacting under

  The (meth) acrylic acid ester derivative of the present invention is not particularly limited. For example, methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, isobutyl (meth) acrylate, (meth ) Tertiary butyl acrylate, hexyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, octyl (meth) acrylate, nonyl (meth) acrylate, decyl (meth) acrylate, dodecyl (meth) acrylate , Stearyl (meth) acrylate, benzyl (meth) acrylate, and the like, and these can be used alone or in combination of two or more. Among these (meth) acrylic acid ester derivatives, in particular, the use of methyl (meth) acrylate, ethyl (meth) acrylate, and butyl (meth) acrylate is the flexibility of the insulating film of the black photosensitive resin composition. It is preferable from the viewpoint of chemical resistance.

  Examples of the radical polymerization initiator include azo compounds such as azobisisobutyronitrile, azobis (2-methylbutyronitrile), 2,2′-azobis-2,4-dimethylvaleronitrile, t- Organic peroxides such as butyl hydroperoxide, cumene hydroperoxide, benzoyl peroxide, dicumyl peroxide, di-t-butyl peroxide, persulfates such as potassium persulfate, sodium persulfate, ammonium persulfate, Acid value hydrogen etc. are mentioned, These can be used individually or in combination of 2 or more types.

  The amount of the radical polymerization initiator used is preferably 0.001 to 5 parts by weight and more preferably 0.01 to 1 part by weight with respect to 100 parts by weight of the monomer used. When the amount is less than 0.001 part by weight, the reaction hardly proceeds, and when the amount is more than 5 parts by weight, the molecular weight may be lowered.

  The amount of solvent used in the above reaction is preferably such that the solute weight concentration in the reaction solution, that is, the solution concentration is 5 wt% or more and 90 wt% or less, and is 20 wt% or more and 70 wt% or less. More preferably. When the solution concentration is less than 5%, the polymerization reaction is difficult to occur and the reaction rate is lowered, and a desired structural substance may not be obtained. When the solution concentration is more than 90% by weight, the reaction solution has a high viscosity. And the reaction may be non-uniform.

  The reaction temperature is preferably 20 to 120 ° C, and more preferably 50 to 100 ° C. When the temperature is lower than 20 ° C., the reaction time becomes too long, and when it exceeds 120 ° C., gelation due to rapid progress of reaction or three-dimensional crosslinking accompanying side reaction may be caused. The reaction time can be appropriately selected depending on the scale of the batch and the reaction conditions employed.

<(B) Organic colorant>
The (B) organic colorant of the present invention is not limited as long as it is either a dye or a pigment and can color the black photosensitive resin composition of the present invention black. A plurality of organic colorants may be combined. As a combination of organic colorants, a blue colorant, a red colorant, a yellow colorant, an orange colorant, and a purple colorant can be arbitrarily combined. Specific examples are shown below by color index numbers.

(Blue colorant)
Although the blue colorant of the present invention is not particularly limited, for example, C.I. which is a phthalocyanine-based, anthraquinone-based, dioxazine-based pigment or the like. I. Pigment Blue 15, 15: 1, 15: 2, 15: 3, 15: 4, 15: 6, 16, 60, dye-based Solvent Blue 35, 63, 68, 70, 83, 87, 94, 97, 122, 136, 67, 70. In addition to the above, a metal-substituted or unsubstituted phthalocyanine compound can also be used. In particular, copper phthalocyanine is preferable from the viewpoint of coloring power.

(Red colorant)
Although it does not specifically limit as a yellow coloring agent of this invention, For example, C.I. I. C. I. Pigment Red 122, 149, 166, 177, 179, 242, 224, 254, 264, 272.

(Yellow colorant)
Although it does not specifically limit as a yellow coloring agent of this invention, For example, C.I. I. Pigment Yellow 83, 110, 128, 138, 139, 150, 151, 154, 155, 180, 181.

(Orange colorant)
The orange colorant of the present invention is not particularly limited. I. Pigment Orange 5, 13, 14, 16, 17, 24, 34, 36, 38, 40, 43, 46, 49, 51, 55, 59, 61, 63, 64, 71, 73.

(Purple colorant)
The purple colorant of the present invention is not particularly limited. I. Pigment Violet 19, 23, 29, 30, 32, 36, 37, 38, 39, 40, 50, Solvent Violet 13, 36.

Although it does not specifically limit as a combination of the coloring agent which makes the black photosensitive resin composition of this invention black, A specific example is shown below. In addition, the ratio shown below represents the weight ratio.
The orange colorant is combined at a ratio of 1.5 to 3.0 with respect to the blue colorant 1.0.
The red colorant is combined at a ratio of 1.2 to 3.0 with respect to the blue colorant 1.0. The purple colorant is combined at a ratio of 1.2 to 3.0 with respect to the blue colorant 1.0.
The blue colorant 1.0 is combined with the yellow colorant at a ratio of 1.5 to 4 and the orange colorant at a ratio of 1.0 to 2.5.
For the blue colorant 1.0, the red colorant is combined at a ratio of 1.0 to 2.0, and the yellow colorant is combined at a ratio of 1.5 to 3.0.
For the blue colorant 1.0, the yellow colorant is combined at a ratio of 1.0 to 3.0, and the purple colorant is combined at a ratio of 1 to 2.0.
The orange colorant is combined in a ratio of 0.5 to 2.0 and the purple colorant is combined in a ratio of 0.5 to 2.0 with respect to the blue colorant 1.0.
In particular, a combination of a blue colorant, an orange colorant, and a purple colorant is preferable because the blackness and the amount of the colorant can be controlled.

  The amount of the colorant in the black photosensitive resin composition of the present invention is preferably 3 to 10 parts by weight and more preferably 5 to 7 parts by weight with respect to 100 parts by weight of the component (A). When the amount of the colorant is less than 3 parts by weight, the blackness tends to be 25 or more, and when it is more than 10 parts by weight, the blackness is 25 or less, but the thixotropic index. Therefore, there is a concern that clogging at the time of ink filtration, deterioration at the time of printing, and a decrease in resolution are concerned.

By setting the blackness of the black photosensitive resin composition of the present invention to 25 or less, more preferably 20 or less, the concealability of the resulting black photosensitive resin composition can also be obtained. Here, the method for measuring the blackness of the photosensitive resin composition is not particularly limited, but can be determined by, for example, the following measurement method. The value of the L * a * b * color system was measured according to JIS Z 8729 using the following color difference meter. Here, the L * value, which is an index representing lightness, was evaluated as an index of blackness. A smaller L * value means better blackness.
Color difference meter: 45 ° color difference meter (NR-11B manufactured by Nippon Denshoku Industries Co., Ltd.)
<(C) Thermosetting resin>
The (C) thermosetting resin of the present invention is a compound containing at least one thermosetting organic group in the molecule.

  (C) component of this invention will not be specifically limited if it is the said structure, For example, an epoxy resin, an oxetane resin, a phenol resin, an isocyanate resin, a block isocyanate resin, a bismaleimide resin, a bisallyl nadiimide resin, a polyester resin (For example, unsaturated polyester resin), diallyl phthalate resin, silicon resin, vinyl ester resin, melamine resin, polybismaleimide triazine resin (BT resin), cyanate resin (for example, cyanate ester resin), urea resin, guanamine resin, sulfoamide Resins, aniline resins, polyurea resins, thiourethane resins, polyazomethine resins, episulfide resins, ene-thiol resins, benzoxazine resins, copolymer resins thereof, modified resins obtained by modifying these resins, or these Mixtures of resins with each other or other resins and the like.

  As the component (C) of the present invention, among the above thermosetting resins, the use of a polyfunctional epoxy resin can impart heat resistance to an insulating film obtained by curing a black photosensitive resin composition. It is preferable because adhesion to a conductor such as a metal foil or a circuit board can be imparted.

  The polyfunctional epoxy resin is a compound containing at least two epoxy groups in the molecule. For example, as the bisphenol A type epoxy resin, trade names jER828, jER1001, jER1002, and Japan Corporation made by Japan Epoxy Resin Co., Ltd. ADEKA brand name Adeka Resin EP-4100E, Adeka Resin EP-4300E, Nippon Kayaku Co., Ltd. trade names RE-310S, RE-410S, DIC Corporation trade names Epicron 840S, Epicron 850S, Epicron 1050, Epicron 7050 Toto Kasei Co., Ltd. trade names Epototo YD-115, Epototo YD-127, Epototo YD-128, Bisphenol F type epoxy resin, trade names jER806, jE made by Japan Epoxy Resin Co., Ltd. 807, trade names Adeka Resin EP-4901E, Adeka Resin EP-4930, Adeka Resin EP-4950, manufactured by Adeka Co., Ltd., trade names RE-303S, RE-304S, RE-403S, RE-404S, DIC manufactured by Nippon Kayaku Co., Ltd. Product names Epicron 830 and Epicron 835 manufactured by Co., Ltd. Product names Epototo YDF-170, Epototo YDF-175S, Epototo YDF-2001, and Bisphenol S type epoxy resin manufactured by Toto Kasei Co., Ltd. As Epiklon EXA-1514 and hydrogenated bisphenol A type epoxy resin, trade names jERYX8000, jERYX8034, jERYL7170, manufactured by Japan Epoxy Resin Co., Ltd., and Adeka Resin EP-4 manufactured by ADEKA Co., Ltd. 80E, DIC Corporation trade name Epicron EXA-7015, Toto Kasei Co., Ltd. trade name Epototo YD-3000, Epototo YD-4000D, biphenyl type epoxy resin, Japan Epoxy Resin Corporation trade name jERYX4000, jERYL6121H, jERYL6640, jERYL6667, Nippon Kayaku Co., Ltd. trade name NC-3000, NC-3000H, phenoxy type epoxy resin, Japan Epoxy Resin Co., Ltd. trade name jER1256, jER4250, jER4275, naphthalene type epoxy resin Are DIC Corporation's trade names Epicron HP-4032, Epicron HP-4700, Epicron HP-4200, Nippon Kayaku Co., Ltd. trade names NC-7000L, Phenoh As the lenovolac type epoxy resin, trade names jER152 and jER154 manufactured by Japan Epoxy Resin Co., Ltd., trade names EPPN-201-L manufactured by Nippon Kayaku Co., Ltd., trade names Epicron N-740 manufactured by DIC Corporation, and Epicron N- 770, product names Epototo YDPN-638 manufactured by Tohto Kasei Co., Ltd., and cresol novolak type epoxy resins include product names EOCN-1020, EOCN-102S, EOCN-103S, EOCN-104S, DIC shares manufactured by Nippon Kayaku Co., Ltd. Brand names EPIKRON N-660, Epicron N-670, Epicron N-680, Epicron N-695, and trisphenol methane type epoxy resins manufactured by the company include trade names EPPN-501H and EPPN-501HY manufactured by Nippon Kayaku Co., Ltd. EPPN-502 As a dicyclopentadiene type epoxy resin, trade name XD-1000 manufactured by Nippon Kayaku Co., Ltd., as trade name Epicron HP-7200 manufactured by DIC Corporation, and as an amine type epoxy resin, a product manufactured by Japan Epoxy Resin Co., Ltd. Names jER604, jER630, Toto Kasei Co., Ltd. trade names Epototo YH-434, Epototo YH-434L, Mitsubishi Gas Chemical Co., Ltd. trade names TETRAD-X, TERRAD-C, and flexible epoxy resins include Japan Epoxy Resin Trade names jER871, jER872, jERYL7175, jERYL7217, DIC Corporation's trade name Epicron EXA-4850, and urethane-modified epoxy resins include ADEKA Corporation's trade names Adeka Resin EPU-6, Adeka Resin Examples of PU-73, Adeka Resin EPU-78-11, and rubber-modified epoxy resins include Adeka Resin EPR-4023, Adeka Resin EPR-4026, Adeka Resin EPR-1309, and Adeka Resin EPR-1309. Examples of the product names Adeka Resin EP-49-10, Adeka Resin EP-49-20, and heterocyclic-containing epoxy resins include the product names TEPIC manufactured by Nissan Chemical Co., Ltd.

  The black photosensitive resin composition of the present invention is not particularly limited as a curing agent for the thermosetting resin. For example, phenol novolak resin, cresol novolak resin, phenol resin such as naphthalene type phenol resin, amino resin, urea Resins, melamine, dicyandiamide and the like can be mentioned, and these can be used alone or in combination of two or more.

  Further, the curing accelerator is not particularly limited, but for example, phosphine compounds such as triphenylphosphine; amine compounds such as tertiary amine, trimethanolamine, triethanolamine and tetraethanolamine; 1,8- Borate compounds such as diaza-bicyclo [5,4,0] -7-undecenium tetraphenylborate, imidazole, 2-ethylimidazole, 2-ethyl-4-methylimidazole, 2-phenylimidazole, 2-un Imidazoles such as decylimidazole, 1-benzyl-2-methylimidazole, 2-heptadecylimidazole, 2-isopropylimidazole, 2,4-dimethylimidazole, 2-phenyl-4-methylimidazole; 2-methylimidazoline, 2- Ethyl imidazoline, 2 Imidazolines such as isopropylimidazoline, 2-phenylimidazoline, 2-undecylimidazoline, 2,4-dimethylimidazoline, 2-phenyl-4-methylimidazoline; 2,4-diamino-6- [2′-methylimidazolyl- ( 1 ′)]-ethyl-s-triazine, 2,4-diamino-6- [2′-undecylimidazolyl- (1 ′)]-ethyl-s-triazine, 2,4-diamino-6- [2 ′ Examples include azine-based imidazoles such as -ethyl-4'-methylimidazolyl- (1 ')]-ethyl-s-triazine, and these can be used alone or in combination of two or more.

<(D) Radical polymerizable compound>
The (D) radical polymerizable compound of the present invention is a compound containing (E) a radical polymerizable group that undergoes a polymerization reaction by a photopolymerization initiator in the molecule. Among these, a resin having at least one unsaturated double bond in the molecule is preferable. Furthermore, the unsaturated double bond is preferably a (meth) acryloyl group or a vinyl group.

  Examples of the component (D) of the present invention include bisphenol F EO-modified (n = 2 to 50) diacrylate, bisphenol A EO-modified (n = 2 to 50) diacrylate, and bisphenol S EO-modified (n = 2 to 50). Diacrylate, bisphenol F EO modified (n = 2-50) dimethacrylate, bisphenol A EO modified (n = 2-50) dimethacrylate, bisphenol S EO modified (n = 2-50) dimethacrylate, 1,6-hexane Diol diacrylate, neopentyl glycol diacrylate, ethylene glycol diacrylate, pentaerythritol diacrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate, dipentaerythritol hexaacrylate, tetramethylo Rupropanetetraacrylate, tetraethylene glycol diacrylate, 1,6-hexanediol dimethacrylate, neopentyl glycol dimethacrylate, ethylene glycol dimethacrylate, pentaerythritol dimethacrylate, trimethylolpropane trimethacrylate, pentaerythritol trimethacrylate, dipentaerythritol Hexamethacrylate, tetramethylolpropane tetramethacrylate, tetraethylene glycol dimethacrylate, methoxydiethylene glycol methacrylate, methoxypolyethylene glycol methacrylate, β-methacryloyloxyethyl hydrogen phthalate, β-methacryloyloxyethyl hydrogen succinate, 3-chloro-2-hydro Cypropyl methacrylate, stearyl methacrylate, phenoxyethyl acrylate, phenoxydiethylene glycol acrylate, phenoxy polyethylene glycol acrylate, β-acryloyloxyethyl hydrogen succinate, lauryl acrylate, ethylene glycol dimethacrylate, diethylene glycol dimethacrylate, triethylene glycol dimethacrylate, polyethylene glycol Dimethacrylate, 1,3-butylene glycol dimethacrylate, 1,6-hexanediol dimethacrylate, neopentyl glycol dimethacrylate, polypropylene glycol dimethacrylate, 2-hydroxy-1,3-dimethacryloxypropane, 2,2-bis [4- (Methacryloxyethoxy) Phenyl] propane, 2,2-bis [4- (methacryloxy diethoxy) phenyl] propane, 2,2-bis [4- (methacryloxy polyethoxy) phenyl] propane, polyethylene glycol diacrylate, tripropylene glycol diacrylate, polypropylene Glycol diacrylate, 2,2-bis [4- (acryloxydiethoxy) phenyl] propane, 2,2-bis [4- (acryloxypolyethoxy) phenyl] propane, 2-hydroxy-1-acryloxy-3-methacryloxy Propane, trimethylolpropane trimethacrylate, tetramethylol methane triacrylate, tetramethylol methane tetraacrylate, methoxydipropylene glycol methacrylate, methoxytriethylene glycol Acrylate, nonyl phenoxy polyethylene glycol acrylate, nonyl phenoxy polypropylene glycol acrylate, 1-acryloyloxypropyl-2-phthalate, isostearyl acrylate, polyoxyethylene alkyl ether acrylate, nonyl phenoxy ethylene glycol acrylate, polypropylene glycol dimethacrylate, 1,4- Butanediol dimethacrylate, 3-methyl-1,5-pentanediol dimethacrylate, 1,6-mexanediol dimethacrylate, 1,9-nonanediol methacrylate, 2,4-diethyl-1,5-pentanediol dimethacrylate 1,4-cyclohexanedimethanol dimethacrylate, dipropylene glycol diacrylate, Licyclodecane dimethanol diacrylate, 2,2-hydrogenated bis [4- (acryloxy polyethoxy) phenyl] propane, 2,2-bis [4- (acryloxy polypropoxy) phenyl] propane, 2,4-diethyl -1,5-pentanediol diacrylate, ethoxylated tomethylolpropane triacrylate, propoxylated tomethylolpropane triacrylate, isocyanuric acid tri (ethane acrylate), pentathritol tetraacrylate, ethoxylated pentathritol tetraacrylate, propoxylation Pentathritol tetraacrylate, ditrimethylolpropane tetraacrylate, dipentaerythritol polyacrylate, triallyl isocyanurate, glycidyl methacrylate, glycidyl allyl Ether, 1,3,5-triacryloylhexahydro-s-triazine, triallyl 1,3,5-benzenecarboxylate, triallylamine, triallyl citrate, triallyl phosphate, arborbital, diallylamine, diallyldimethylsilane, diallyl Disulfide, diallyl ether, zalyl sialate, diallyl isophthalate, diallyl terephthalate, 1,3-dialyloxy-2-propanol, diallyl sulfide diallyl maleate, 4,4′-isopropylidene diphenol dimethacrylate, 4,4′-isopropyl Examples thereof include redene diphenol diacrylate, and these can be used alone or in combination of two or more. In particular, when one containing 2 to 50 mol of EO (ethylene oxide) repeating units contained in one molecule of diacrylate or dimethacrylate is used, an aqueous development represented by an alkaline aqueous solution of the photosensitive resin composition is used. This is preferable because the solubility in the solution is improved and the development time is shortened.

<(E) Photopolymerization initiator>
The (E) photopolymerization initiator of the present invention is a compound that is activated by energy such as UV and initiates / promotes a reaction of a radical polymerizable group.

  The component (E) of the present invention is not particularly limited as long as it has the above structure. For example, Michler's ketone, 4,4′-bis (diethylamino) benzophenone, 4,4 ′, 4 ″ -tris (dimethylamino) ) Triphenylmethane, 2,2′-bis (2-chlorophenyl) -4,4 ′, 5,5′-tetraphenyl-1,2′-diimidazole, acetophenone, benzoin, 2-methylbenzoin, benzoinmethyl ester -Tell, benzoin ethyl ether, benzoin isopropyl ether, benzoin isobutyl ether, 2-t-butylanthraquinone, 1,2-benzo-9,10-anthraquinone, methylanthraquinone, thioxanthone, 2,4-diethyl Thioxanthone, 2-isopropylthioxanthone, 1-hydroxycyclohexyl phenyl keto , Diacetylbenzyl, benzyldimethylketal, benzyldiethylketal, 2 (2′-furylethylidene) -4,6-bis (trichloromethyl) -S-triazine, 2 [2 ′ (5 ″ -methyl) Furyl) ethylidene] -4,6-bis (trichloromethyl) -S-triazine, 2 (p-methoxyphenyl) -4,6-bis (trichloromethyl) -S-triazine, 2,6-di (p-azidobenzal) ) -4-methylcyclohexanone, 4,4'-diazidochalcone, di (tetraalkylammonium) -4,4'-diazidostilbene-2,2'-disulfonate, 2,2-dimethoxy-1,2 -Diphenylethane-1-one, 1-hydroxy-cyclohexyl-phenyl-ketone, 2-hydroxy-2-methyl-1-phenyl-propane 1-one, 1- [4- (2-hydroxyethoxy) -phenyl] -2-hydroxy-2-methyl-1-propan-1-one, 2-methyl-1- [4- (methylthio) phenyl]- 2-morpholinopropan-1-one, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butane-1, bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide, Bis (2,6-dimethoxybenzoyl) -2,4,4-trimethyl-pentylphosphine oxide, 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide, 2-hydroxy-2-methyl-1-phenyl- Propane-1-ketone, bis (n5-2,4-cyclopentadien-1-yl) -bis (2,6-difluoro-3- (1H-pi 1-yl) -phenyl) titanium, 1,2-octanedione, 1- [4- (phenylthio)-, 2- (O-benzoyloxime)], iododium, (4-methylphenyl) [ 4- (2-methylpropyl) phenyl] -hexafluorophosphate (1-), ethyl-4-dimethylaminobenzoate, 2-ethylhexyl-4-dimethylaminobenzoate, ethanone, 1- [9-ethyl-6- ( 2-methylbenzoyl) -9H-carbazol-3-yl]-, 1- (O-acetyloxyome) and the like. The component (E) is preferably selected as appropriate, and it is desirable to use a mixture of one or more.

  The component (E) according to the present invention is preferably blended so as to be 0.1 to 20 parts by weight with respect to 100 parts by weight of the component (A). The blending ratio is preferable because the photosensitivity of the black photosensitive resin composition is improved. When the component (E) is less than the above range, the reaction of the radical polymerizable group at the time of light irradiation hardly occurs and the curing is often insufficient. Moreover, when there are more (E) components than the said range, adjustment of light irradiation amount becomes difficult and it may be in an overexposed state. Therefore, in order to advance the photocuring reaction efficiently, it is preferable to adjust within the above range.

<Other ingredients>
Various additives such as an adhesion assistant, an antifoaming agent, a leveling agent, a polymerization inhibitor, and a flame retardant can be further added to the black photosensitive resin composition of the present invention as necessary.

  Examples of the antifoaming agent include acrylic compounds, vinyl compounds, butadiene compounds, and the like.

  Examples of the leveling agent include acrylic compounds and vinyl compounds.

  Examples of the adhesion assistant (also referred to as adhesion-imparting agent) include silane coupling agents, triazole compounds, tetrazole compounds, and triazine compounds.

  Examples of the polymerization inhibitor include hydroquinone and hydroquinone monomethyl ether.

  Examples of the flame retardant include phosphoric ester compounds, halogen-containing compounds, metal hydroxides, organic phosphorus compounds, silicones, and the like. It can be used as a flame retardant. Moreover, you may use a flame retardant suitably combining 1 type (s) or 2 or more types.

  Among these flame retardants, non-halogen compounds are more preferable from the viewpoint of environmental pollution, and metal hydroxides and phosphorus flame retardants are particularly preferable.

<Mixing method of black photosensitive resin composition>
The black photosensitive resin composition of the present invention can be obtained by pulverizing and dispersing the above components (A) to (E) and other components and mixing them. The pulverizing / dispersing method is not particularly limited, and for example, it is performed using a general kneading apparatus such as a bead mill, a ball mill, or a three roll. The particle diameter of the particles contained in the black photosensitive resin composition can be measured by a method using a gauge defined in JIS K 5600-2-5. Moreover, if a particle size distribution measuring apparatus is used, an average particle diameter, a particle diameter, and a particle size distribution can be measured.

The thixotropic index in the present invention is evaluated as an index indicating clogging performance and screen printing performance during ink filtration. Here, if the thixotropy is larger than 3.5, clogging during ink filtration occurs, and the screen printability deteriorates. Here, the thixotropic index in this invention was calculated | required from ratio of rotation speed 2rpm measured with the following apparatuses and rotation speed 20rpm.
Equipment used: B-type viscometer (Brookfield B-type viscometer)
Here, the method for controlling the thixotropic index in the present invention to 1.1 to 3.5 is not particularly limited, but examples thereof include the following methods.
(A) The amount of the organic colorant is 3 to 10 parts by weight with respect to 100 parts by weight of the component, the L * value indicating blackness is 25 or less, and the amount of other filler components is (A ) By making the amount 70 parts by weight or less with respect to 100 parts by weight of the component, the thixotropic index can be controlled in the range of 1.1 to 3.5. Here, the other filler component is a powder material having an average particle diameter of 20 μm or less and substantially not dissolved in an organic solvent. Here, being substantially insoluble in the organic solvent means that the weight dissolved in 100 parts by weight of the organic solvent at room temperature is less than 0.1 parts by weight. Further, the organic solvent is not particularly limited, and for example, those exemplified above can be used.
Depending on the type of other filler, there is no problem if the thixotropy is in the range of 1.1 to 3.5 even at 70 parts by weight or more. Moreover, even if it is 70 parts by weight or less, the thixotropy may be out of the range.

  An insulating film or a relief pattern can be formed as follows using the black photosensitive resin composition of the present invention directly or after preparing a black photosensitive resin composition solution. First, the black photosensitive resin composition or the black photosensitive resin composition solution is applied to a substrate and dried to remove the organic solvent. The substrate can be applied by screen printing, curtain roll, river roll, spray coating, spin coating using a spinner, or the like. The coating film (preferably having a thickness of 5 to 100 μm, particularly 10 to 100 μm) is dried at 120 ° C. or less, preferably 40 to 100 ° C.

  Next, after drying, a negative photomask is placed on the dried coating film and irradiated with actinic rays such as ultraviolet rays, visible rays, and electron beams. Next, the relief pattern can be obtained by washing out the unexposed portion with a developer using various methods such as shower, paddle, immersion, or ultrasonic wave. Since the time until the pattern is exposed varies depending on the spraying pressure and flow rate of the developing device and the temperature of the etching solution, it is desirable to find the optimum device conditions as appropriate.

  As the developer, an alkaline aqueous solution is preferably used. This developer may contain a water-soluble organic solvent such as methanol, ethanol, n-propanol, isopropanol, or N-methyl-2-pyrrolidone. Examples of the alkaline compound that gives the alkaline aqueous solution include hydroxides, carbonates, hydrogen carbonates, amine compounds, and the like of alkali metals, alkaline earth metals, or ammonium ions, and specifically sodium hydroxide. , Potassium hydroxide, ammonium hydroxide, sodium carbonate, potassium carbonate, ammonium carbonate, sodium bicarbonate, potassium bicarbonate, ammonium bicarbonate, tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide, tetraisopropylammonium Hydroxide, N-methyldiethanolamine, N-ethyldiethanolamine, N, N-dimethylethanolamine, triethanolamine, triisopropanolamine, triiso Etc. can be mentioned Ropiruamin, aqueous solution with compounds of other long as it exhibits basicity can also be naturally used. The concentration of the alkaline compound that can be suitably used in the development step of the black photosensitive resin composition of the present invention is 0.01 to 20% by weight, particularly preferably 0.02 to 10% by weight. . Further, the temperature of the developer depends on the composition of the black photosensitive resin composition and the composition of the alkali developer, and is generally 0 ° C. or higher and 80 ° C. or lower, more generally 10 ° C. or higher and 60 ° C. or lower. It is preferably used in the following.

  The relief pattern formed by the development process is rinsed to remove unnecessary residues. Examples of the rinsing liquid include water and acidic aqueous solutions.

  Next, heat treatment is performed on the obtained relief pattern. By performing a heat treatment to react the reactive groups remaining in the molecular structure, an insulating film with high heat resistance can be obtained. The thickness of the insulating film is determined in consideration of the wiring thickness and the like, but is preferably about 2 to 50 μm. The final curing temperature at this time is desired to be able to be cured by heating at a low temperature for the purpose of preventing oxidation of the wiring and the like and not reducing the adhesion between the wiring and the substrate.

  The curing temperature at this time is preferably 100 ° C. or higher and 250 ° C. or lower, more preferably 120 ° C. or higher and 200 ° C. or lower, and particularly preferably 130 ° C. or higher and 180 ° C. or lower. If the final heating temperature is high, the wiring is oxidatively deteriorated, which is not desirable.

  The insulating film obtained from the black photosensitive resin composition of the present invention preferably has a thickness of about 2 to 50 μm and a resolution of at least 10 μm after photocuring, particularly a resolution of about 10 to 1000 μm. For this reason, the insulating film obtained from the black photosensitive resin composition of this invention is especially suitable as an insulating material of a flexible substrate. Furthermore, it is used for various photo-curing wiring coating protective agents, photosensitive heat-resistant adhesives, electric wire / cable insulation coatings, and the like.

  In addition, this invention can provide the same insulating material even if it uses the resin film obtained by apply | coating the said black photosensitive resin composition or the black photosensitive resin composition solution to the base-material surface, and drying. it can.

EXAMPLES Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited to these examples.
(Synthesis Example 1)
<(A) Binder polymer 1>
A reaction vessel equipped with a stirrer, a thermometer, a dropping funnel, and a nitrogen inlet tube was charged with 100.0 g of methyltriglyme (= 1,2-bis (2-methoxyethoxy) ethane) as a solvent for polymerization, and under nitrogen flow The temperature was raised to 80 ° C. with stirring. To this, 12.0 g (0.14 mol) of methacrylic acid, 28.0 g (0.16 mol) of benzyl methacrylate, 60.0 g (0.42 mol) of butyl methacrylate, previously mixed at room temperature, As a radical polymerization initiator, 0.5 g of azobisisobutyronitrile was added dropwise from a dropping funnel over 3 hours while keeping the temperature at 80 ° C. After completion of the dropwise addition, the reaction solution was heated to 90 ° C. while stirring, and the reaction solution was further stirred for 2 hours while maintaining the temperature of the reaction solution at 90 ° C. for reaction. By performing the above reaction, a poly (meth) acrylic resin solution (A-1) was obtained. The resulting resin solution had a solid content concentration of 50%, a weight average molecular weight of 48,000, and a solid content acid value of 78 mgKOH / g. The solid content concentration, weight average molecular weight, and acid value were measured by the following methods.

<Concentration of solid content>
The measurement was performed according to JIS K 5601-1-2. The drying conditions were 170 ° C. × 1 hour.

<Weight average molecular weight>
Measurement was performed under the following conditions.
Equipment used: Tosoh HLC-8220GPC equivalent column: Tosoh TSK gel Super AWM-H (6.0 mm ID x 15 cm) x 2 guard columns: Tosoh TSK guard column Super AW-H
Eluent: 30 mM LiBr + 20 mM H3PO4 in DMF
Flow rate: 0.6 mL / min
Column temperature: 40 ° C
Detection conditions: RI: Polarity (+), response (0.5 sec)
Sample concentration: about 5 mg / mL
Standard product: PEG (polyethylene glycol).

<Acid value>
Measurement was performed according to JIS K 5601-2-1.

(Synthesis Example 2)
<(A) Binder polymer 2>
Into a reaction vessel equipped with a stirrer, a thermometer, and a nitrogen introduction tube, 30.00 g of methyltriglyme (= 1,2-bis (2-methoxyethoxy) ethane) was charged as a polymerization solvent, and this was mixed with norbornene diisocyanate 10 .31 g (0.050 mol) was charged and dissolved by heating to 80 ° C. with stirring under a nitrogen stream. To this solution, 50.00 g (0.025 mol) of polycarbonate diol (manufactured by Asahi Kasei Corporation, product name PCDL T5652, weight average molecular weight 2000) and 6.51 g (0.050 mol) of 2-hydroxyethyl methacrylate were added to methyltriglyme. A solution dissolved in 30.00 g was added over 1 hour. This solution was reacted by heating and stirring at 80 ° C. for 5 hours. By performing the said reaction, the urethane type resin solution (A-2) which has a urethane bond in a molecule | numerator was obtained. The resulting resin solution had a solid content concentration of 53% and a weight average molecular weight of 5,200. The solid content concentration and the weight average molecular weight were measured in the same manner as in Synthesis Example 1.

(Synthesis Example 3)
<(A) Binder polymer 3>
A reaction vessel equipped with a stirrer, a thermometer, and a nitrogen introduction tube was charged with 130.60 g of methyltriglyme (= 1,2-bis (2-methoxyethoxy) ethane) as a polymerization solvent. ', 4,4'-oxydiphthalic dianhydride 31.02 g (0.100 mol), bis [4- (3-aminophenoxy) phenyl] sulfone 34.45 g (0.080 mol), poly (tetramethylene / 3-methyltetramethylene ether) glycol bis (4-aminobenzoate) 24.76 g (0.020 mol) was charged and stirred for 30 minutes under a nitrogen stream to obtain a polyamic acid solution. Next, this solution was heated to 190 ° C. and reacted for 2 hours. By performing the above reaction, a polyimide resin solution (A-3) was obtained. The resulting resin solution had a solid content concentration of 49% and a weight average molecular weight of 36,000. The solid content concentration and the weight average molecular weight were measured in the same manner as in Synthesis Example 1.

(Examples 1-6 and Comparative Examples 1 and 2)
<Preparation of black photosensitive resin composition>
Add (A) binder polymer, (B) organic colorant, (C) thermosetting resin, (D) radical polymerizable compound, (E) photopolymerization initiator, and other components obtained in the synthesis example. A black photosensitive resin composition was prepared. Table 1 shows the blending amount of each constituent raw material in the resin solid content and the kind of the raw material. Note that 1,2-bis (2-methoxyethoxy) ethane, which is an organic solvent in the table, is the total amount of solvent including the solvent contained in the synthesized resin solution. The black photosensitive resin composition was first mixed with a general stirrer equipped with a stirring blade, and then passed twice with a three-roll mill to obtain a uniform solution. When the particle diameter was measured with a grindometer, all were 10 μm or less. The following evaluation was carried out by completely defoaming the foam in the solution with a defoaming device.

<1> Ciba Japan Co., Ltd. Blue Blue Colorant Product Name Pigment Blue 15: 3
<2> Product name Pigment Yellow 139 manufactured by Clariant Japan KK
<3> Product name of Pigment Red 149 manufactured by Clariant Japan Co., Ltd.
<4> Product name Pigment Orange 43, manufactured by Clariant Japan Co., Ltd.
<5> Product name of Pigment Violet 19 made by Clariant Japan Co., Ltd.
<6> Product name of bifunctional epoxy resin manufactured by Mitsubishi Chemical Co., Ltd. <7> Product name of EO-modified bisphenol A dimethacrylate manufactured by Hitachi Chemical Co., Ltd. <8> Product of oxime ester photopolymerization initiator manufactured by BASF Japan Ltd. <9> Kyoeisha Chemical Co., Ltd. product name of butadiene type antifoaming agent.
<10> Product name of phosphinate by Clariant Japan Co., Ltd. <Preparation of coating film on polyimide film>
Using a Baker applicator, the black photosensitive resin composition was cast and applied to a 25 μm polyimide film (manufactured by Kaneka Co., Ltd .: trade name 25 NPI) to an area of 100 mm × 100 mm so that the final dry thickness was 20 μm. Then, after drying at 80 ° C. for 20 minutes, exposure was performed by irradiating with an ultraviolet ray having an accumulated exposure amount of 300 mJ / cm ² . Subsequently, spray development was performed for 90 seconds at a discharge pressure of 1.0 kgf / mm ² using a solution obtained by heating a 1.0 wt% sodium carbonate aqueous solution to 30 ° C. After development, the film was sufficiently washed with pure water, and then heat-cured in an oven at 150 ° C. for 30 minutes to produce an insulating film of a black photosensitive resin composition on the polyimide film.

<Evaluation of insulating film>
The following items were evaluated. The evaluation results are shown in Table 2.

(I) Thixotropic index The thixotropic index of the black photosensitive resin composition was carried out under the following conditions.
Equipment used: B-type viscometer (Brookfield B-type viscometer)
The thixotropy was determined from the ratio of the rotation speed 2 rpm and the rotation speed 20 rpm.

(Ii) Screen printability Screen printability evaluation of the black photosensitive resin composition was performed under the following conditions.
Equipment used: Screen printer (Minomat 5575 manufactured by Mino Group)
Base material: Polyimide film (manufactured by Kaneka Corporation, Apical 25 NPI, thickness 25 μm)
Coating thickness: 30 μm
Screen mesh: Polyester 100 mesh Squeegee: Flat type, hardness 70 °
Printing speed: 100mm / sec
After screen printing under the above screen printing conditions to form a coating film, the coating film was observed after being left for 1 minute for determination.
○: Bubbles are not contained in the coating film.
X: Foam is contained in the coating film.

(Iii) Photosensitivity The surface of the insulating film obtained by the same method as in the above item <Preparation of coating film on polyimide film> was observed and determined. However, the exposure was performed by placing a negative photomask of line width / space width = 100 μm / 100 μm.
◯: A photosensitive pattern having a line width / space width = 100/100 μm can be drawn on the polyimide film surface without noticeable line thickness or development residue.
X: A line width / space width = 100/100 μm photosensitive pattern is not drawn on the polyimide film surface.

(Vi) Concealment property The test piece obtained in the above item <Preparation of coating film on polyimide film> is placed on a graph paper having a 1 mm square grid, and the grid is visually observed from above the test piece. The concealment was evaluated by a method for confirming the above.
○: Invisible cells.
X: What can see a grid.

(V) Blackness Color difference meter: 45 degree color difference meter (NR-11B manufactured by Nippon Denshoku Industries Co., Ltd.), the blackness of the test piece obtained in the above item <Preparation of coating film on polyimide film> L * was measured.

Claims (5)

A black photosensitive resin composition comprising at least (A) a binder polymer, (B) an organic colorant, (C) a thermosetting resin, (D) a radical polymerizable compound, and (E) a photopolymerization initiator. , thixotropy Toro picks index of the photosensitive resin composition is 1.1 to 3.5, and L * value of the insulating film obtained by curing the said black photosensitive resin composition Ri der 25 below ,
The (A) binder polymer is any one of a poly (meth) acrylic resin, a urethane resin, and a polyimide resin,
The black photosensitive resin composition, wherein the L * value is an L * value measured in an insulating film having a thickness of 20 μm .   2. The black photosensitive resin composition according to claim 1, wherein at least one of the component (B) contains a copper phthalocyanine-based blue colorant. An insulating film obtained from the black photosensitive resin composition according to claim 1. The printed wiring board with an insulating film which coat | covered the insulating film of Claim 3 on the printed wiring board. The flexible printed circuit board with an insulating film which coat | covered the insulating film of Claim 3 on the flexible printed circuit board.