JP2009271445A - New photosensitive resin composition and its application - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a photosensitive resin composition which is capable of microfabrication owing to its photosensitivity, can be developed with a dilute aqueous alkali solution, can be cured at a low temperature (≤200°C), exhibits flexibility, excels in electric-insulation reliability, resistance to the heat of soldering, organic solvent resistance and flame retardancy, ensures little warpage of the substrate after curing and excellent adhesion to a sealant, and avoids bleed-out of a flame retardant component from a cured film. <P>SOLUTION: The photosensitive resin composition comprises at least (A) a urethane imide oligomer terminated by a carboxylic acid, (B) a diamino compound and/or an isocyanate compound, (C) a photosensitive resin, (D) a photopolymerization initiator, (E) an organic solvent, and (F) a flame retardant which is solid at room temperature and insoluble in the components (A)-(E). <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  Since this invention has photosensitivity, it can be finely processed, can be developed with a dilute alkaline aqueous solution, can be cured at a low temperature (200 ° C. or less), has high flexibility, electrical insulation reliability, and solder heat resistance. Photosensitive resin composition having excellent organic solvent resistance and flame retardancy, small warpage of the cured substrate, excellent adhesion to the sealant, and no bleed out of the flame retardant component from the cured film, The present invention relates to a resin film, an insulating film, and a printed wiring board with an insulating film obtained therefrom.

  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 liquid cover coat ink or the like may be used as a surface protection material for a circuit board. In particular, a liquid cover coat ink having a photosensitive function is preferably used when fine processing is required. Yes. As the liquid cover coat ink, a photosensitive ink mainly composed of epoxy resin or the like (generally also referred to as a solder resist) is used. This ink 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, various proposals have been made as liquid cover coat inks that can exhibit flexibility and high electrical insulation reliability.

  For example, a photosensitive resin composition containing a terminal half-esterified imidosiloxane oligomer has been proposed (see, for example, Patent Documents 1 and 2).

In addition, a photosensitive resin composition containing a photopolymerizable unsaturated compound including a urethane compound having an ethylenically unsaturated bond, which is excellent in flexibility, photocurability, and insulating property and capable of alkali development has been proposed ( For example, refer to Patent Documents 3 to 5.)
JP 2000-212446 A JP 2001-215702 A JP 2000-95837 A JP 2000-241969 A JP 2003-131362 A

  However, when the cured film formed from the resin composition containing the terminal half-esterified imide siloxane oligomer described in Patent Documents 1 and 2 is used as a circuit board material, impurities contained in the siloxane diamine are cured film. There is a problem that the semiconductor bleeds out and induces a malfunction of the semiconductor. In addition, when a cured film formed from a resin composition containing a terminal half-esterified imidosiloxane oligomer is used as a circuit board material, the wettability of the surface of the cured film is poor and the adhesion with various sealants is poor. There is also.

  In the above Patent Document 3, the electrical insulation reliability and heat resistance under high temperature and high humidity are poor as compared with the case where a polyimide type or polyamic acid type photosensitive resin composition is used as the cover coat ink. In Patent Document 4, a condensed phosphate ester-based additive type flame retardant is added for the purpose of imparting flame retardancy, and hydrolysis of this flame retardant causes a significant decrease in electrical insulation reliability. There were problems such as bleeding out of the flame retardant from the cured film and elution into an organic solvent or gold plating bath.

  Further, in Patent Document 5 mentioned above, a hydrated metal compound is added for the purpose of imparting flame retardancy, and the risk of bleeding out is reduced. However, the hydrated metal compound alone is insufficient in flame retardancy. In order to obtain a stable flame retardant effect, a halogen-containing compound and a condensed phosphate ester-added flame retardant must also be added, so that the essential solution of bleedout has not been reached, There is a problem that halogen-containing compounds are released into the environment during combustion.

  In view of the above situation, the problem of the present invention is that it has photosensitivity, can be finely processed, can be developed with a dilute alkaline aqueous solution, can be cured at a low temperature (200 ° C. or less), has high flexibility, Excellent insulation reliability, solder heat resistance, organic solvent resistance, flame retardancy, low warpage of cured substrate, excellent adhesion to sealant, and bleed out of flame retardant components from cured film An object of the present invention is to provide a photosensitive resin composition, a photosensitive resin film, a polyimide insulating film, and a printed wiring board with an insulating film.

  As a result of diligent research to solve the above problems, the present inventors have at least (A) a terminal carboxylic acid urethane imide oligomer, (B) a diamino compound and / or an isocyanate compound, (C) a photosensitive resin, and (D) light. To have photosensitivity from a photosensitive resin composition containing a polymerization initiator, (E) an organic solvent, and (F) a flame retardant that is solid at room temperature and insoluble in the components (A) to (E). It can be finely processed, can be developed with dilute alkaline aqueous solution, can be cured at low temperature (200 ° C or less), has high flexibility, electrical insulation reliability, solder heat resistance, organic solvent resistance, flame resistance It has been found that a photosensitive resin composition is obtained that is excellent in resistance, has low warpage of the substrate after curing, has excellent adhesion to the sealant, and does not cause bleeding out of the flame retardant component from the cured film.

  That is, the photosensitive resin composition according to the present invention comprises at least (A) a terminal carboxylic acid urethane imide oligomer, (B) a diamino compound and / or an isocyanate compound, (C) a photosensitive resin, and (D) a photopolymerization initiator. And (E) an organic solvent, and (F) a flame retardant which is solid at room temperature and is insoluble in the components (A) to (E).

  In the photosensitive resin composition according to the present invention, the (A) terminal carboxylic acid urethane imide oligomer is preferably a tetracarboxylic acid urethane imide oligomer.

  Moreover, in the photosensitive resin composition concerning this invention, the said (A) terminal carboxylic acid urethane imide oligomer is at least (a) the diol compound shown by following General formula (1), and (b) following General formula (2). ) To synthesize a terminal isocyanate compound, and then (c) synthesize a terminal acid anhydride urethane imide oligomer by reacting a tetracarboxylic dianhydride represented by the following general formula (3). Furthermore, (d) it is preferably obtained by reacting water and / or a primary alcohol.

(In the formula, R represents a divalent organic group, and l is an integer of 1 to 20.)

(In the formula, X represents a divalent organic group.)

(In the formula, Y represents a tetravalent organic group.)

  Moreover, in the photosensitive resin composition concerning this invention, it is preferable that the said (a) diol compound contains the polycarbonate diol shown by following General formula (4) at least.

(In the formula, plural R _{1 s} each independently represent a divalent organic group, and m is an integer of 1 to 20.)

  Moreover, in the photosensitive resin composition concerning this invention, it is preferable that the said (A) terminal carboxylic acid urethane imide oligomer contains a carboxyl group also in a side chain.

  In the photosensitive resin composition according to the present invention, (A) terminal carboxylic acid urethane imide oligomer, (B) diamino compound and / or isocyanate compound, (C) photosensitive resin, and (D) photopolymerization initiator are: , (A) 10 to 200 parts by weight of photosensitive resin (D) with respect to 100 parts by weight of solid content of (A) terminal carboxylic acid urethane imide oligomer and (B) diamino compound and / or isocyanate compound. The photopolymerization initiator is preferably blended so as to be 0.1 to 50 parts by weight.

  Moreover, in the photosensitive resin composition concerning this invention, it is preferable that the flame retardant which is solid at the said (F) room temperature and is insoluble in (A)-(E) component is a metal hydroxide.

  In the photosensitive resin composition according to the present invention, the flame retardant (F) that is solid at room temperature and insoluble in the components (A) to (E) is preferably a phosphinate.

  Moreover, in the photosensitive resin composition concerning this invention, the compounding ratio of the flame retardant which is solid at said (F) room temperature and is insoluble in (A)-(E) component is (A) terminal carboxylate urethane. 1 to 100 parts by weight with respect to 100 parts by weight of the solid content of the imide oligomer, (B) diamino compound and / or isocyanate compound, (C) photosensitive resin and (D) photopolymerization initiator. It is preferable that it is blended.

  Moreover, in the photosensitive resin composition concerning this invention, it is preferable to contain (G) thermosetting resin further.

  The blending ratio of the (G) thermosetting resin includes (A) terminal carboxylic acid urethane imide oligomer, (B) diamino compound and / or isocyanate compound, (C) photosensitive resin and (D) photopolymerization initiator. It is preferable that the blended amount is 0.5 to 100 parts by weight with respect to 100 parts by weight of the total solid content.

  Moreover, the resin film concerning this invention is obtained by drying, after apply | coating the said 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 obtained by coating the insulating film on the printed wiring board.

  As described above, the photosensitive resin composition of the present invention comprises at least (A) a terminal carboxylic acid urethane imide oligomer, (B) a diamino compound and / or an isocyanate compound, (C) a photosensitive resin, and (D) photopolymerization. The photosensitive resin of the present invention comprises an initiator, (E) an organic solvent, and (F) a flame retardant that is solid at room temperature and insoluble in the components (A) to (E). The cured film obtained from the composition is rich in flexibility, excellent in electrical insulation reliability, solder heat resistance, organic solvent resistance and flame resistance, has good physical properties, and has little warping after curing, sealing Excellent adhesion to the agent and no bleed out of the flame retardant component from the cured film. Therefore, the photosensitive resin composition of the present invention can be used for protective films of various circuit boards and exhibits excellent effects.

  Hereinafter, the present invention will be described in detail.

<Photosensitive resin composition>
The photosensitive resin composition of the present invention comprises at least (A) a terminal carboxylic acid urethane imide oligomer, (B) a diamino compound and / or an isocyanate compound, (C) a photosensitive resin, and (D) photopolymerization initiation. And (E) an organic solvent, and (F) a flame retardant that is solid at room temperature and insoluble in the components (A) to (E).

  In addition, about the (A) terminal carboxylic acid urethane imide oligomer in the photosensitive resin composition of this invention, the terminal tetracarboxylic carboxylic acid urethane imide oligomer obtained using polycarbonate diol is used more preferably, However, It is limited to this. It is not something.

  Further, the photosensitive resin composition of the present invention comprises (A) a terminal carboxylic acid urethane imide oligomer, (B) a diamino compound and / or an isocyanate compound, (C) a photosensitive resin, and (D) photopolymerization initiation. And (E) an organic solvent, and (F) a flame retardant that is solid at room temperature and insoluble in the components (A) to (E), and further contains (G) a thermosetting resin. May be.

  Here, at least (A) a terminal carboxylic acid urethane imide oligomer, (B) a diamino compound and / or an isocyanate compound, (C) a photosensitive resin, (D) a photopolymerization initiator, The present inventors have shown that the photosensitive resin composition containing E) an organic solvent and (F) a flame retardant that is solid at room temperature and insoluble in the components (A) to (E) is excellent in various properties. I suspected that this may be due to the following reasons. That is, (A) the terminal carboxylic acid urethane imide oligomer has an imide skeleton and a urethane bond in the molecule, and therefore has excellent heat resistance and electrical insulation reliability derived from the imide skeleton, chemical resistance and flexibility derived from the urethane bond, Since it has a carboxyl group at the end, it becomes soluble in a developing solution typified by a dilute alkaline aqueous solution and can be finely processed by exposure and development. Among them, the terminal tetracarboxylic acid urethane imide oligomer obtained by using polycarbonate diol is surprisingly excellent in chemical resistance of the polycarbonate skeleton, although it contains many carboxyl groups at the terminal, The exposed part (cured part) has no damage such as swelling / dissolution of the coating film by the developer, and the unexposed part (uncured part) contains many carboxyl groups at the end, so it dissolves in a short development time. A pattern with good resolution can be obtained.

  Moreover, (A) terminal carboxylic acid urethane imide oligomer reacts with the (B) diamino compound and / or isocyanate compound which are chain extenders by heating to increase the molecular weight while producing an imide group. For this reason, the photosensitive resin composition of the present invention becomes a mixture of oligomers and monomers before exposure and heating, and is very excellent in solubility in a solvent, and is very stable even when stored at room temperature for a long time in a normal state of a solution. It is. For this reason, it becomes possible to create a highly concentrated solution. The reaction between (A) the terminal carboxylic acid urethane imide oligomer and the chain extender (B) diamino compound and / or isocyanate compound proceeds at a temperature of about 200 ° C. or less and about 160 to 170 ° C. Due to the flexibility derived from the urethane bond and raw material diol component contained in the terminal carboxylic acid urethane imide oligomer and the high mobility of the molecular skeleton derived from the low molecular weight, even at a curing temperature range of about 160 to 170 ° C., It is speculated that the molecular weight increase reaction proceeds while the imide group is generated as a result of the active molecular motion and the sufficient collision between the terminal carboxyl group and the chain extender.

  In addition, since the molecular skeleton does not contain a siloxane skeleton, the resulting cured film surface has good wettability, not only very good adhesion to various members, but also derived from the siloxane component from the cured film Therefore, when a cured film is used as an insulating film of a printed wiring board, the semiconductor does not malfunction.

  Moreover, since the flame retardant which is (F) component is solid at room temperature and insoluble in the (A)-(E) component, it can be handled as a filler (filler). For this reason, when blended in a photosensitive resin composition, it is difficult for the flame retardant component to bleed out from the cured film obtained from the photosensitive resin composition, and the glass transition temperature decreases and the surface hardness of the cured coating film. The coating film excellent in heat resistance and hydrolysis resistance is obtained, and surprisingly, the photosensitive resin composition of the present invention uses a flame retardant that can be treated as a filler. In spite of this, sufficient flame retardancy is obtained, the cured film is not brittle, and a cured film rich in flexibility is obtained. This is because the affinity between the terminal carboxylic acid urethane imide oligomer and the flame retardant is high as well as the flexibility of the cured film obtained by the reaction of the terminal carboxylic acid urethane imide oligomer with the diamino compound and / or isocyanate compound. It is speculated that this is because the adhesive strength is improved. In addition, the photosensitive resin composition of the present invention can exhibit a sufficient flame retardant effect even with a low addition amount of the component (F) alone. This is because aromatic and imide groups are contained in the cured film. Since it contains, the thermal decomposition start temperature of a cured film is high, and since it contains many nitrogen atoms derived from a urethane bond and an imide group, it is estimated that it is because it is excellent in the combustion suppression effect at the time of combustion.

  Hereinafter, (A) terminal carboxylic acid urethane imide oligomer, (B) diamino compound and / or isocyanate compound, (C) photosensitive resin, (D) photopolymerization initiator, (E) organic solvent, (F) at room temperature. Flame retardant that is solid and insoluble in components (A) to (E), (G) thermosetting resin, other components, and (A) to (F) or (A) to (G) A mixing method will be described.

<(A) Terminal carboxylic acid urethane imide oligomer>
The terminal carboxylic acid urethane imide oligomer used in the present invention has at least one carboxylic acid at the terminal, has a urethane structure inside, and the imide ring is closed, and the number average molecular weight is in terms of polyethylene glycol. The oligomer is 30,000 or less, more preferably 20,000 or less.

  More specifically, in the present invention, the (A) terminal carboxylic acid urethane imide oligomer does not have a siloxane bond in the main chain skeleton, and has the following general formula (5)

(In the formula, R and X each independently represent a divalent organic group, and n represents an integer of 1 or more.)
Which has at least one repeating unit having a urethane bond represented by the following general formula (6)

(In the formula, each of R ₂ independently represents a divalent organic group, R ₃ independently represents a hydrogen atom or an alkyl group, Y represents a tetravalent organic group, and p represents Indicates an integer of 0 or more.)
And a compound having a structure having at least two imide bonds and at least one carboxyl group at the terminal.

  The number average molecular weight of the terminal carboxylic acid urethane imide oligomer of the present invention is preferably 30,000 or less, more preferably 20,000 or less, and particularly preferably 15,000 or less in terms of polyethylene glycol. Controlling the number average molecular weight within the above range is preferable because the solubility of the terminal carboxylic acid urethane imide oligomer in the organic solvent is improved.

  Moreover, since the terminal carboxylic acid urethane imide oligomer of the present invention has no siloxane bond in the structure, it has excellent wettability on the surface of a cured film formed using this, and has good adhesion to various sealants. It is. Furthermore, since the bond in the structure is not an amide bond but an imide bond, the storage stability is excellent. Therefore, it is possible to suppress a change in the viscosity of the solution with time when the photosensitive resin composition solution is prepared and stored.

  The (A) terminal carboxylic acid urethane imide oligomer used in the present invention is not particularly limited as long as it has the above structure, but more preferably, at least (a) the following general formula (1) )

(In the formula, R represents a divalent organic group, and l is an integer of 1 to 20.)
(B) the following general formula (2)

(In the formula, X represents a divalent organic group.)
The terminal isocyanate compound is synthesized by reacting with the diisocyanate compound represented by formula (3), and then (c) the following general formula (3)

(In the formula, Y represents a tetravalent organic group.)
It is obtained by reacting a tetracarboxylic dianhydride represented by the following formula to synthesize a terminal acid anhydride urethane imide oligomer, and (d) reacting with water and / or a primary alcohol.

<(A) Diol compound>
The (a) diol compound used in the present invention is a branched or straight-chain compound having two hydroxyl groups in the molecule represented by the general formula (1). (A) The diol compound 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 Diols, alkylene diols such as 1,4-cyclohexanediol and 1,4-cyclohexanedimethanol, dimethylolpropionic acid (2,2-bis (hydroxymethyl) propionic acid), dimethylolbutanoic acid (2,2-bis ( Hydroxymethyl) butanoic acid), 2,3-dihydroxybenzoic acid, 2 Carboxyl group-containing diols such as 4-dihydroxybenzoic acid, 2,5-dihydroxybenzoic acid, 2,6-dihydroxybenzoic acid, 3,4-dihydroxybenzoic acid, 3,5-dihydroxybenzoic acid, polyethylene glycol, polypropylene glycol, Polytetramethylene glycol, polyoxyalkylene diols such as random copolymers of tetramethylene glycol and neopentyl glycol, polyester diols obtained by reacting polyhydric alcohols with polybasic acids, polycarbonate diols having a carbonate skeleton, γ -Polycaprolactone diol obtained by ring-opening addition reaction of lactones such as butyl lactone, ε-caprolactone, δ-valerolactone, bisphenol A, ethylene oxide adduct of bisphenol A, bisphenol Examples include a propylene oxide adduct of Nord A, hydrogenated bisphenol A, an ethylene oxide adduct of hydrogenated bisphenol A, a propylene oxide adduct of hydrogenated bisphenol A, and these can be used alone or in combination of two or more. .

  (A) As a diol compound, following General formula (4)

(In the formula, plural R _{1 s} each independently represent a divalent organic group, and m is an integer of 1 to 20.)
It is particularly preferable to use a polycarbonate diol represented by This is preferable in that the heat resistance, flexibility, water resistance, chemical resistance, and electrical insulation reliability under high temperature and high humidity of the obtained cured film can be further improved.

  More specifically, examples of the polycarbonate diol include trade names PCDL T-4671, T-4672, T-4691, T-4692, T-5650J, T-5651, T-5651 manufactured by Asahi Kasei Chemicals Corporation. , T-6001, T-6002, Daicel Chemical Industries, Ltd. Product Name Plaxel CD CD205, CD205PL, CD205HL, CD210, CD210PL, CD210HL, CD220, CD220PL, CD220HL, Kuraray Co., Ltd. product name Kuraray Polyol C-1015N , C-1050, C-1065N, C-1090, C-2015N, C-2065N, C-2090, Nippon Polyurethane Industry Co., Ltd., trade names NIPPOLAN 981, 980R, 982R These can be used alone or in combinations of two or more. The number average molecular weight of the polycarbonate diol is preferably 500 to 5000, more preferably 750 to 2500, and particularly preferably 1000 to 2000 in terms of polystyrene. When the number average molecular weight of the polycarbonate diol is within the above range, it is preferable in that the chemical resistance and flexibility of the obtained cured film can be improved. When the number average molecular weight is less than 500, the flexibility of the resulting cured film may be reduced, and when it is 5000 or more, the solvent solubility of the terminal carboxylic acid urethane imide oligomer may be reduced.

  More preferably, a carboxyl group can also be introduced into the side chain of the terminal carboxylic acid urethane imide oligomer by combining the polycarbonate diol and the carboxyl group-containing diol. Thereby, the branch point of the main chain of a terminal carboxylic acid urethane imide oligomer increases, crystallinity falls, and it is preferable at the point which can improve the solvent solubility of a terminal carboxylic acid urethane imide oligomer.

<(B) Diisocyanate compound>
The (b) diisocyanate compound used in the present invention is a compound having two isocyanate groups in the molecule, represented by the general formula (2).

  Examples of the (b) diisocyanate compound include 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, Diphenylmethane-3,3'-diiso Anate, diphenylmethane-3,4'-diisocyanate, diphenyl ether-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] diisocyanate Compounds, hydrogenated diphenylmethane diisocyanate, hydrogenated xylylene diisocyanate, isophorone diisocyanate, norbornene diisocyanate, etc., hexamethylene diisocyanate Sulfonate, trimethyl hexamethylene diisocyanate, aliphatic diisocyanate compounds and the like such as lysine diisocyanate, and these may be used alone or in combinations of two or more. Use of these is preferable for increasing the heat resistance of the resulting cured film. Moreover, you may use what was stabilized with the blocking agent required in order to avoid a change over time. Such blocking agents include alcohol, phenol, oxime and the like, but are not particularly limited.

  (B) As the diisocyanate compound, diphenylmethane-4,4'-diisocyanate, diphenylmethane-3,3'-diisocyanate, diphenylmethane-3,4'-diisocyanate, tolylene-2,4-diisocyanate, tolylene-2,6-diisocyanate It is particularly preferable to use norbornene diisocyanate. Thereby, it is preferable at the point which can improve the heat resistance of the cured film obtained, and water resistance further.

  In order to improve the developability of the photosensitive resin composition, (b) tolylene-2,6-diisocyanate, tolylene-2,4-diisocyanate and 1,6-hexamethylene diisocyanate are suitable as the diisocyanate compound. Used for.

<Method for synthesizing terminal isocyanate compound>
The method for synthesizing a terminal isocyanate compound obtained by reacting (a) a diol compound and (b) a diisocyanate compound used in the present invention is the ratio of the number of hydroxyl groups to the number of isocyanate groups. Is reacted in a solvent-free or organic solvent such that isocyanate group / hydroxyl group = 1 or more and 2.10 or less, more preferably 1.10 or more and 2.10 or less, and further preferably 1.90 or more and 2.10 or less. Can be obtained.

  When two or more types of (a) diol compounds are used, the reaction with (b) diisocyanate compound may be carried out after mixing two or more types of (a) diol compounds. You may react a compound and (b) diisocyanate compound separately. Moreover, after reacting (a) diol compound and (b) diisocyanate compound, the obtained terminal isocyanate compound is further reacted with another (a) diol compound, and this is further reacted with (b) diisocyanate compound. May be. The same applies when two or more types of (b) diisocyanate compounds are used. In this way, a desired terminal isocyanate compound can be produced.

  The reaction temperature between (a) and (b) is preferably 40 to 160 ° C, 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 in the absence of a solvent. However, in order to control the reaction, it is desirable to carry out the reaction in an organic solvent system. For example, examples of the organic solvent include sulfoxide solvents such as dimethyl sulfoxide and diethyl sulfoxide, N , N-dimethylformamide, formamide solvents such as N, N-diethylformamide, N, N-dimethylacetamide, acetamide solvents such as N, N-diethylacetamide, N-methyl-2-pyrrolidone, N-vinyl-2 -Pyrrolidone solvents such as pyrrolidone, phenol solvents such as phenol, o-, m- or p-cresol, xylenol, halogenated phenol, catechol, hexamethylphosphoramide, γ-butyrolactone, and the like. 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 (also known as 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, a solvent may be used ethers such as ethyl ether also ethylene glycol. Of these, symmetrical glycol diethers are preferably used because side reactions are unlikely to occur.

  The amount of 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.

  Moreover, the terminal isocyanate compound obtained by the said reaction can also block the isocyanate group of the resin terminal after completion | finish of synthesis | combination with blocking agents, such as alcohol, lactams, and oximes.

<Method of synthesizing terminal acid anhydride urethane imide oligomer>
The terminal acid anhydride urethane imide oligomer used in the present invention can be obtained by reacting the terminal isocyanate compound obtained as described above with tetracarboxylic dianhydride. At this time, the blending amount of the terminal isocyanate compound and the tetracarboxylic dianhydride is preferably such that the ratio of the number of isocyanate groups to the number of acid dianhydride groups is acid dianhydride group / isocyanate group = 2.10 or less, It is more preferably 1.10 or more and 2.10 or less, and further preferably 1.90 or more and 2.10 or less. Moreover, the solvent used at the time of the synthesis | combination of the said terminal isocyanate compound may be used for reaction of a terminal isocyanate compound and tetracarboxylic dianhydride as it is, and also said solvent can be added in addition.

<Tetracarboxylic dianhydride>
Examples of the tetracarboxylic dianhydride used in the synthesis of the terminal acid anhydride urethane imide oligomer in the present invention include 3,3 ′, 4,4′-benzophenone tetracarboxylic 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, - it can be used tetracarboxylic acid dianhydride such as dicarboxylic anhydrides.

  More preferably, the tetracarboxylic dianhydride used for the synthesis of the terminal acid anhydride urethane imide oligomer is 2,2-bis [4- (3,4-dicarboxyphenoxy) phenyl] propane dianhydride, 3, 3 ′, 4,4′-diphenylsulfonetetracarboxylic dianhydride and 3,3 ′, 4,4′-oxydiphthalic dianhydride. By using these, the solubility of the terminal carboxylic acid urethane imide oligomer obtained in an organic solvent can be improved, and the chemical resistance of the resulting cured film is improved.

  The tetracarboxylic dianhydride is 2,2-bis [4- (3,4-dicarboxyphenoxy) phenyl] propane dianhydride or 5- (2,5-dioxotetrahydro-3-furanyl). It is more preferable to use -3-methyl-3-cyclohexene-1,2-dicarboxylic acid anhydride from the viewpoint of compatibility with other materials in the photosensitive resin composition.

  The amount of the tetracarboxylic dianhydride used in the present invention is as follows when the amount of the polyol (more specifically, the diol compound) used in the production of the terminal isocyanate compound is 1 mol. It is preferably used in a proportion of 50 mol or more and 2.50 mol or less in order to arrange a carboxyl group at both ends of the terminal carboxylic acid urethane imide oligomer, and a particularly preferable use range is 1.90 mol or more and 2.10 mol or less. It is to use at the rate of. This is preferable because tetracarboxylic dianhydride that does not contribute to the reaction can be reduced.

<Method for producing terminal acid anhydride urethane imide oligomer>
Various methods are mentioned as a reaction method of a terminal isocyanate compound and tetracarboxylic dianhydride in the manufacturing method of a terminal acid anhydride urethane imide oligomer. The typical method is illustrated below. However, any method may be used as long as tetracarboxylic dianhydride is arranged at the terminal.

  Method 1: A terminal isocyanate compound is gradually added to a solution in which tetracarboxylic dianhydride is dispersed or dissolved in an organic solvent. The reaction temperature at this time is 100 ° C. or higher and 300 ° C. or lower, more preferably 140 ° C. or higher and 250 ° C. or lower. It is preferred that the reaction occurs and imidization proceeds at the same time when the terminal isocyanate compound is added by heating to such a temperature. However, after the terminal isocyanate compound and tetracarboxylic dianhydride are completely dissolved at a low temperature, a method of imidizing by heating to a high temperature may be used.

  Method 2: A terminal isocyanate compound is gradually added and dissolved in a solution in which tetracarboxylic dianhydride is dispersed or dissolved in an organic solvent. Imidization can be carried out by drawing a vacuum while heating and drying a uniformly dissolved solution heated to 100 ° C. or higher and 250 ° C. or lower.

<Synthesis of terminal carboxylic acid urethane imide oligomer>
The terminal carboxylic acid urethane imide oligomer can be obtained by reacting water and / or a primary alcohol with the terminal acid anhydride urethane imide oligomer that can be obtained by the above method. In addition, although it does not specifically limit as primary alcohol, For example, methanol, ethanol, propanol, a butanol etc. can be used suitably.

  As a method of reacting the terminal acid anhydride urethane imide oligomer with water and / or primary alcohol, water and / or primary alcohol is added to the terminal acid anhydride urethane imide oligomer, and the terminal acid anhydride urethane imide oligomer is used. It is preferable to add the ring at a rate of 2.0 to 300 times, more preferably 2.0 to 200 times the molar amount of the tetracarboxylic dianhydride used for the production, thereby opening the ring. Although this reaction can be carried out without solvent, for example, sulfoxide solvents such as dimethyl sulfoxide and diethyl sulfoxide, formamide solvents such as N, N-dimethylformamide and N, N-diethylformamide, N, N-dimethylacetamide , Acetamide solvents such as N, N-diethylacetamide, pyrrolidone solvents such as N-methyl-2-pyrrolidone and N-vinyl-2-pyrrolidone, phenol, o-, m- or p-cresol, xylenol, halogenated Phenol solvents such as phenol and catechol, or hexamethylphosphoramide, γ-butyrolactone, methyl monoglyme (1,2-dimethoxyethane), methyl diglyme (bis (2-methoxyether) ether), methyl triglyme ( 1,2-bis (2-mesh Xyloxy) ethane), methyltetraglyme (bis [2- (2-methoxyethoxyethyl)] ether), ethyl monoglyme (1,2-diethoxyethane), ethyldiglyme (bis (2-ethoxyethyl) ether) , Symmetric glycol diethers such as butyl diglyme (bis (2-butoxyethyl) ether), γ-butyrolactone, N-methyl-2-pyrrolidone, 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 acetate (also known as carbitol acetate, 2- (2-butoxyethoxy) ethyl acetate)), diethylene glycol Acetates such as nobutyl ether acetate, 3-methoxybutyl acetate, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, dipropylene glycol methyl ether acetate, propylene glycol diacetate, 1,3-butylene glycol diacetate, Propylene 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, - dioxolane, ethylene glycol monobutyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, also be used solvents ethers such as ethyl ether also ethylene glycol. If necessary, low-boiling hexane, acetone, toluene, xylene and the like can be used in combination. Among them, symmetric glycol diethers are particularly preferable because of high solubility of oligomers.

  The above reaction is preferably heated in such a range that the added water and / or primary alcohol does not come out of the reaction system, and is heated in a temperature range of 20 ° C. or higher and 150 ° C. or lower, more preferably 120 ° C. or lower. Is preferable because it facilitates the reaction. It should be noted that the amount of water and / or primary alcohol added is preferably large, but if it is too large, the solubility of other added resins decreases, so that it is preferable to remove unreacted substances after the reaction. The temperature at which unreacted substances are removed after the reaction is preferably equal to or higher than the boiling point of the added water and / or primary alcohol. Unreacted substances can be removed out of the system by heating at such a temperature.

<(B) Diamino compound and / or isocyanate compound>
The diamino compound used as the component (B) in the present invention is a compound having two or more amino groups. Preferably, general formula (7)

(In the formula, R ₄ is a divalent organic group.)
Is an aromatic diamine.

  More specific examples of the diamino compound include m-phenylenediamine, o-phenylenediamine, p-phenylenediamine, m-aminobenzylamine, p-aminobenzylamine, bis (3-aminophenyl) sulfide, (3 -Aminophenyl) (4-aminophenyl) sulfide, bis (4-aminophenyl) sulfide, bis (3-aminophenyl) sulfoxide, (3-aminophenyl) (4-aminophenyl) sulfoxide, bis (4-aminophenyl) ) Sulphoxide, bis (3-aminophenyl) sulfone, (3-aminophenyl) (4-aminophenyl) sulfone, bis (4-aminophenyl) sulfone, 3,4'-diaminobenzophenone, 4,4'-diaminobenzophenone 3,3′-diaminobenzophenone, , 3′-diaminodiphenylmethane, 3,4′-diaminodiphenylmethane, 4,4′-diaminodiphenylmethane, 4,4′-diaminodiphenylether, 3,3′-diaminodiphenylether, 3,4′-diaminodiphenylether, bis [4 -(3-aminophenoxy) phenyl] sulfoxide, bis [4- (aminophenoxy) phenyl] sulfoxide, (4-aminophenoxyphenyl) (3-aminophenoxyphenyl) phenyl] sulfoxide, bis [4- (3-aminophenoxy) ) Phenyl] sulfone, bis [4- (4-aminophenoxy) phenyl] sulfone, (4-aminophenoxyphenyl) (3-aminophenoxyphenyl) phenyl] sulfone, bis [4- (3-aminophenoxy) phenyl] sulfi Bis [4- (aminophenoxy) phenyl] sulfide, (4-aminophenoxyphenyl) (3-aminophenoxyphenyl) phenyl] sulfide, 3,3′-diaminobenzanilide, 3,4′-diaminobenzanilide, 4 , 4'-diaminobenzanilide, bis [4- (3-aminophenoxy) phenyl] methane, bis [4- (4-aminophenoxy) phenyl] methane, [4- (4-aminophenoxyphenyl)] [4- (3-aminophenoxyphenyl)] methane, 1,1-bis [4- (3-aminophenoxy) phenyl] ethane, 1,1-bis [4- (4-aminophenoxy) phenyl] ethane, 1,1- [4- (4-Aminophenoxyphenyl)] [4- (3-aminophenoxyphenyl)] ethane, 1,2-bis [4- (3-a Nophenoxy) phenyl] ethane, 1,2-bis [4- (4-aminophenoxy) phenyl] ethane, 1,2- [4- (4-aminophenoxyphenyl)] [4- (3-aminophenoxyphenyl) ] Ethane, 2,2-bis [4- (3-aminophenoxy) phenyl] propane, 2,2-bis [4- (4-aminophenoxy) phenyl] propane, 2,2- [4- (4-amino) Phenoxyphenyl)] [4- (3-aminophenoxyphenyl)] propane, 2,2-bis [3- (3-aminophenoxy) phenyl] -1,1,1,3,3,3-hexafluoropropane, 2,2-bis [4- (4-aminophenoxy) phenyl] -1,1,1,3,3,3-hexafluoropropane, 2,2- [4- (4-aminophenoxyphenyl)] [4 -(3-Ami Phenoxyphenyl)]-1,1,1,3,3,3-hexafluoropropane, 1,3-bis (3-aminophenoxy) benzene, 1,4-bis (3-aminophenoxy) benzene, 1,4 -Bis (4-aminophenoxy) benzene, 1,3-bis (4-aminophenoxy) benzene, 4,4'-bis (4-aminophenoxy) biphenyl, 4,4'-bis (3-aminophenoxy) biphenyl Bis [4- (3-aminophenoxy) phenyl] ketone, bis [4- (4-aminophenoxy) phenyl] ketone, bis [4- (3-aminophenoxy) phenyl] ether, bis [4- (4- Aminophenoxy) phenyl] ether, polytetramethylene oxide-di-P-aminobenzoate, poly (tetramethylene / 3-methyltetramethyl) Ether) glycol bis (4-aminobenzoate), trimethylene-bis (4-aminobenzoate), p-phenylene-bis (4-aminobenzoate), m-phenylene-bis (4-aminobenzoate), bisphenol A-bis ( 4-aminobenzoate), 2,4-diaminobenzoic acid, 2,5-diaminobenzoic acid, 3,5-diaminobenzoic acid, 3,3′-diamino-4,4′-dicarboxybiphenyl, 4,4 ′ -Diamino-3,3'-dicarboxybiphenyl, 4,4'-diamino-2,2'-dicarboxybiphenyl, [bis (4-amino-2-carboxy) phenyl] methane, [bis (4-amino- 3-carboxy) phenyl] methane, [bis (3-amino-4-carboxy) phenyl] methane, [bis (3-amino-5-carboxy) phenyl] methane, , 2-bis [3-amino-4-carboxyphenyl] propane, 2,2-bis [4-amino-3-carboxyphenyl] propane, 2,2-bis [3-amino-4-carboxyphenyl] hexafluoro Propane, 2,2-bis [4-amino-3-carboxyphenyl] hexafluoropropane, 3,3′-diamino-4,4′-dicarboxydiphenyl ether, 4,4′-diamino-3,3′-di Carboxydiphenyl ether, 4,4′-diamino-2,2′-dicarboxydiphenyl ether, 3,3′-diamino-4,4′-dicarboxydiphenyl sulfone, 4,4′-diamino-3,3′-dicarboxy Diphenylsulfone, 4,4′-diamino-2,2′-dicarboxydiphenylsulfone, 2,3-diaminophenol, 2, Diaminophenols such as 4-diaminophenol, 2,5-diaminophenol, 3,5-diaminophenol, 3,3′-diamino-4,4′-dihydroxybiphenyl, 4,4′-diamino-3,3 ′ Hydroxybiphenyl compounds such as -dihydroxybiphenyl, 4,4'-diamino-2,2'-dihydroxybiphenyl, 4,4'-diamino-2,2 ', 5,5'-tetrahydroxybiphenyl, 3,3' Dihydroxydiphenylmethanes such as -diamino-4,4'-dihydroxydiphenylmethane, 4,4'-diamino-3,3'-dihydroxydiphenylmethane, 4,4'-diamino-2,2'-dihydroxydiphenylmethane, 2,2- Bis [3-amino-4-hydroxyphenyl] propane, 2,2-bis [4-amino-3- Bis [hydroxyphenyl] propanes such as droxyphenyl] propane, 2,2-bis [3-amino-4-hydroxyphenyl] hexafluoropropane, 2,2-bis [3-amino-4-hydroxyphenyl] hexa Bis [hyhydroxyphenyl] hexafluoropropanes such as fluoropropane, 3,3′-diamino-4,4′-dihydroxydiphenyl ether, 4,4′-diamino-3,3′-dihydroxydiphenyl ether, 4,4′- Hydroxydiphenyl ethers such as diamino-2,2′-dihydroxydiphenyl ether, 3,3′-diamino-4,4′-dihydroxydiphenyl sulfone, 4,4′-diamino-3,3′-dihydroxydiphenyl sulfone, 4,4 '-Diamino-2,2'-dihydroxydiphenylsulfur Dihydroxydiphenyl sulphones such as 3,3′-diamino-4,4′-dihydroxydiphenyl sulfide, 4,4′-diamino-3,3′-dihydroxydiphenyl sulfide, 4,4′-diamino-2, Dihydroxydiphenyl sulfides such as 2′-dihydroxydiphenyl sulfide, 3,3′-diamino-4,4′-dihydroxydiphenyl sulfoxide, 4,4′-diamino-3,3′-dihydroxydiphenyl sulfoxide, 4,4′- Dihydroxydiphenyl sulfoxides such as diamino-2,2′-dihydroxydiphenyl sulfoxide, and bis [(hydroxyphenyl) phenyl] alkane compounds such as 2,2-bis [4- (4-amino-3-hydroxyphenoxy) phenyl] propane 4,4′-bis (4- Bis [(hydroxyphenoxy) biphenyl compounds such as mino-3-hydroxyphenoxy) biphenyl, bis [(hydroxyphenoxy) such as 2,2-bis [4- (4-amino-3-hydroxyphenoxy) phenyl] sulfone Phenyl] sulfone compound, 4,4′-diamino-3,3′-dihydroxydiphenylmethane, 4,4′-diamino-2,2′-dihydroxydiphenylmethane, 2,2-bis [3-amino-4-carboxy Bis (hydroxyphenoxy) biphenyl compounds such as phenyl] propane and 4,4′-bis (4-amino-3-hydroxyphenoxy) biphenyl. These can be used alone or in combination of two or more.

  In particular, diamino compounds that can be suitably used for the photosensitive resin composition of the present invention include m-phenylenediamine, bis (3-aminophenyl) sulfone, bis (4-aminophenyl) sulfone, and 3,3′-diaminodiphenylmethane. Bis [4- (3-aminophenoxy) phenyl] sulfone, bis [4- (3-aminophenoxy) phenyl] methane, 2,2-bis [4- (4-aminophenoxy) phenyl] propane, 1,3 -Bis (3-aminophenoxy) benzene, 1,4-bis (3-aminophenoxy) benzene, 1,4-bis (4-aminophenoxy) benzene, 1,3-bis (4-aminophenoxy) benzene, etc. It is an aromatic diamine. Since the heat resistance of the cured film obtained by using said aromatic diamine improves, it is desirable.

  The isocyanate compound used as the component (B) in the present invention is a compound having two or more isocyanate groups.

  Examples of such isocyanate compounds include aromatic diisocyanates such as tolylene diisocyanate, xylylene diisocyanate, diphenylmethane diisocyanate, polymeric diphenylmethane diisocyanate, naphthalene diisocyanate, tolidine diisocyanate, tetramethylxylene diisocyanate, hydrogenated diphenylmethane diisocyanate, and hydrogenated xylylene diisocyanate. Diisocyanates such as alicyclic diisocyanates such as isophorone diisocyanate and norbornene diisocyanate, and aliphatic diisocyanates such as hexamethylene diisocyanate, trimethylhexamethylene diisocyanate and lysine diisocyanate. In particular, the isocyanate compounds suitably used in the present invention are aromatic diisocyanates such as tolylene diisocyanate, xylylene diisocyanate, diphenylmethane diisocyanate, polymeric diphenylmethane diisocyanate, naphthalene diisocyanate, tolidine diisocyanate, and tetramethylxylene diisocyanate.

  It is preferable to use the isocyanate compound because high heat resistance can be imparted to the cured film obtained when the photosensitive resin composition is cured.

  Moreover, in this invention, the blocked isocyanate compound etc. which stabilized the said isocyanate type compound with the blocking agent can be used. The blocked isocyanate compound is a compound that is inactive at room temperature, and is heated to dissociate a blocking agent such as oximes, diketones, phenols, caprolactams, and regenerate isocyanate groups. Product names Duranate 17B-60PX, Duranate TPA-B80E, Duranate MF-B60X, Duranate MF-K60X, Duranate E402-B80T, Asahi Kasei Chemicals Co., Ltd. Trade names Takenate B-830, Takenate B- 815N, Takenate B-846N, Takenate B-882N, trade names Coronate AP-M, Coronate 2503, Coronate 2507, Coronate 2513, Coronate 2515, Million Over preparative MS-50 and the like. In particular, the blocked isocyanate compound suitably used in the present invention is a block isocyanate compound such as a hexamethylene diisocyanate type isocyanurate type, biuret type, adduct type, etc. in which the dissociation temperature of the blocking agent is 160 ° C. or less, hydrogenated diphenylmethane diisocyanate type, water It is an additive xylylene diisocyanate block isocyanate compound.

  The use of the above-mentioned blocked isocyanate compound is preferable because it can impart high adhesion to a substrate to the cured film obtained when the photosensitive resin composition is cured.

  These isocyanate compounds can be used alone or in combination of two or more.

  As the component (B), the diamino compound and the isocyanate compound may be used alone or in combination.

The blending amount of (B) diamino compound and / or isocyanate compound in the present invention is such that (A) component and (B) component in the photosensitive resin composition are:
(A) molar amount of tetracarboxylic dianhydride as component (A),
(B) the molar amount of the terminal isocyanate compound of component (A),
(C) (a) / ((b) + (c)) is 0.80 or more and 1.20 or less when the molar amount of the diamino compound and / or isocyanate compound of component (B) is used. It is preferable that it is blended.

  (B) By making the compounding quantity of a diamino compound and / or an isocyanate type compound into the said range, when thermosetting a photosensitive resin composition, an imidation reaction becomes easy to advance and a high molecular weight polyimide resin is obtained. Therefore, it is preferable because the heat resistance is improved.

<(C) Photosensitive resin>
The photosensitive resin (C) in the present invention is a resin in which a chemical bond is formed by a photopolymerization initiator. Among these, a resin having at least one unsaturated double bond in the molecule is preferable. Furthermore, the unsaturated double bond is an acryl group (CH ₂ ═CH— group), a methacryloyl group (CH═C (CH ₃ ) — group) or a vinyl group (—CH═CH— group). Is preferred.

  Examples of the photosensitive resin (C) 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, tetramethyl Propane tetraacrylate, tetraethylene glycol diacrylate, 1,6-hexanediol dimethacrylate, neopentyl glycol dimethacrylate, ethylene glycol dimethacrylate, pentaerythritol dimethacrylate, trimethylolpropane trimethacrylate, pentaerythritol trimethacrylate, dipenta Erythritol hexamethacrylate, tetramethylolpropane tetramethacrylate, tetraethylene glycol dimethacrylate, methoxydiethylene glycol methacrylate, methoxypolyethylene glycol methacrylate, β-methacryloyloxyethyl hydrogen phthalate, β-methacryloyloxyethyl hydrogen succinate, 3-chloro-2- Hide Xylpropyl 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-methacryl Roxypropane, trimethylolpropane trimethacrylate, tetramethylolmethane triacrylate, tetramethylolmethane tetraacrylate, methoxydipropylene glycol methacrylate, methoxytriethylene group Cole acrylate, nonylphenoxy polyethylene glycol acrylate, nonyl phenoxy polypropylene glycol acrylate, 1-acryloyloxypropyl-2-phthalate, isostearyl acrylate, polyoxyethylene alkyl ether acrylate, nonylphenoxyethylene 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 di Methacrylate, 1,4-cyclohexanedimethanol dimethacrylate, dipropylene glycol diacrylate, Tricyclodecane 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 ali Ether, 1,3,5-triacryloylhexahydro-s-triazine, triallyl1,3,5-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 Redene diphenol diacrylate and the like are preferable, but are not limited thereto. In particular, the repeating unit of EO (ethylene oxide) contained in one molecule of diacrylate or methacrylate is preferably in the range of 2-50, more preferably 2-40. By using an EO repeating unit in the range of 2 to 50, the solubility of the photosensitive resin composition in an aqueous developer typified by an alkaline aqueous solution is improved, and the development time is shortened. Furthermore, it is difficult for stress to remain in the cured film obtained by curing the photosensitive resin composition. For example, among the printed wiring boards, when laminated on a flexible printed wiring board based on a polyimide resin, curling of the printed wiring board is prevented. Features such as being able to be suppressed.

  In particular, it is particularly preferable to use the EO-modified diacrylate or dimethacrylate together with an acrylic resin having 3 or more acrylic groups or methacrylic groups in order to improve developability. For example, ethoxylated isocyanuric acid EO-modified triacrylate, Ethoxylated isocyanuric acid EO modified trimethacrylate, ethoxylated trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate, trimethylolpropane triacrylate, propoxylated trimethylolpropane triacrylate, pentaerythritol tri Acrylate, ethoxylated pentaerythritol tetraacrylate, ethoxylated pentaerythritol tetraacrylate, ditrimethyl Propanetetraacrylate, ditrimethylolpropane tetraacrylate, propoxylated pentaerythritol tetraacrylate, pentaerythritol tetraacrylate, dipentaerythritol hexaacrylate, 2,2,2-trisacryloyloxymethyl ethyl succinic acid, 2,2, 2-trisacryloyloxymethylethylphthalic acid, propoxylated ditrimethylolpropane tetraacrylate, propoxylated dipentaerythritol hexaacrylate, ethoxylated isocyanuric acid triacrylate, ε-caprolactone modified tris- (2-acryloxyethyl) isocyanurate, Caprolactone-modified ditrimethylolpropane tetraacrylate, the following general formula (8)

(Wherein a + b = 6 and n = 12.) A compound represented by the following general formula (9)

(Wherein a + b = 4 and n = 4), a compound represented by the following general formula (10)

A compound represented by the following general formula (11)

(Where m = 1, a = 2, b = 4, or m = 1, a = 3, b = 3, or m = 1, a = 6, b = 0, or m = 2, a = 6 , B = 0)), a compound represented by the following general formula (12)

(Wherein a + b + c = 3.6), a compound represented by the following general formula (13)

A compound represented by the following general formula (14)

An acrylic resin such as a compound represented by the formula (where m · a = 3, a + b = 3, where “m · a” is a product of m and a) is preferably used.

  In addition, hydroxyl groups in the molecular structure skeleton such as 2-hydroxy-3-phenoxypropyl acrylate, monohydroxyethyl acrylate phthalate, ω-carboxy-polycaprolactone monoacrylate, acrylic acid dimer, pentaerythritol tri and tetraacrylate, Those having a carbonyl group are also preferably used.

  In addition, any photosensitive resin such as an epoxy-modified acrylic (methacrylic) resin, a urethane-modified acrylic (methacrylic) resin, or a polyester-modified acrylic (methacrylic) resin may be used.

  In addition, although it is also possible to use 1 type as a photosensitive resin, using 2 or more types together is preferable when improving the heat resistance of the cured film after photocuring.

<(D) Photopolymerization initiator>
The (D) photopolymerization initiator in the present invention is a compound that is activated by energy such as UV and starts and accelerates the reaction of the photosensitive resin. Examples of the (D) photopolymerization initiator include, for example, Michler's ketone, 4,4′-bis (diethylamino) benzophenone, 4,4 ′, 4 ″ -tris (dimethylamino) triphenylmethane, and 2,2 ′. -Bis (2-chlorophenyl) -4,4 ', 5,5'-tetraphenyl-1,2'-diimidazole, acetophenone, benzoin, 2-methylbenzoin, benzoin methyl ether, benzoin ethyl ether, Benzoin isopropyl ether, benzoin isobutyl ether, 2-t-butylanthraquinone, 1,2-benzo-9,10-anthraquinone, methylanthraquinone, thioxanthone, 2,4-diethylthioxanthone, 2-isopropylthioxanthone, 1- Hydroxycyclohexyl phenyl ketone, diacetylbenzyl, benzyldimethyl Ketal, benzyldiethylketal, 2 (2′-furylethylidene) -4,6-bis (trichloromethyl) -S-triazine, 2 [2 ′ (5 ″ -methylfuryl) 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-propan-1-one, 1- [4- (2-hydroxyethoxy)- Enyl] -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-cyclopentadiene -1-yl) -bis (2,6-difluoro-3- (1H-pyrrol-1-yl) -phenyl) titanium, 1,2- Kutanonedione, 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) etc. are mentioned. The photopolymerization initiator is desirably selected as appropriate, and it is desirable to use a mixture of one or more.

  (A) component, (B) component, (C) component, and (D) component in the photosensitive resin composition of this invention are with respect to 100 weight part of solid content which totaled (A) component and (B) component. (C) It is preferable to mix | blend so that 10-200 weight part and (D) component may be 0.1-50 weight part.

  The blending ratio is preferable because various properties (such as electrical insulation reliability) of the cured product and insulating film finally obtained are improved.

  (C) When the photosensitive resin is less than the above range, it is preferable because the heat resistance of the cured film after photocuring the photosensitive resin composition is lowered and the contrast when exposed and developed is difficult to be obtained. There may not be. For this reason, it is possible to set the resolution at the time of exposure / development to an optimal range by setting the value within the above range.

  (D) When there are few photoinitiators than the said range, the hardening reaction of the acrylic resin at the time of light irradiation hardly occurs, and hardening may become inadequate in many cases. Moreover, when there is too much, adjustment of light irradiation amount becomes difficult and may be in an overexposure state. Therefore, in order to advance the photocuring reaction efficiently, it is preferable to adjust within the above range.

<(E) Organic solvent>
Examples of the organic solvent (E) in the present invention include sulfoxide solvents such as dimethyl sulfoxide and diethyl sulfoxide, methyl monoglyme (1,2-dimethoxyethane), methyl diglyme (bis (2-methoxyether) ether), Methyltriglyme (1,2-bis (2-methoxyethoxy) ethane), methyltetraglyme (bis [2- (2-methoxyethoxyethyl)] ether), ethyl monoglyme (1,2-diethoxyethane), Symmetric glycol diethers such as ethyl diglyme (bis (2-ethoxyethyl) ether), butyl diglyme (bis (2-butoxyethyl) ether), γ-butyrolactone, methyl acetate, ethyl acetate, isopropyl acetate, n- Propyl acetate, butyl acetate, propylene glycol Monoethyl ether acetate, ethylene glycol monobutyl ether acetate, diethylene glycol monoethyl ether acetate (also known as carbitol acetate, 2- (2-butoxyethoxy) ethyl acetate), diethylene glycol monobutyl ether acetate, 3-methoxybutyl acetate, ethylene glycol Acetates such as monomethyl ether acetate, ethylene glycol monoethyl ether acetate, dipropylene glycol methyl ether 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, Examples include ethers such as diethylene glycol monobutyl ether and ethylene glycol monoethyl ether, and these can be used alone or in combination of two or more. Among them, symmetric glycol diethers are particularly preferable because the terminal carboxylic acid urethane imide oligomer has high solubility.

  The component (E) in the photosensitive resin composition of the present invention is 10 to 400 parts by weight with respect to 100 parts by weight of the total of the components (A), (B), (C), and (D). More preferably, it is 20-200 weight part, Especially preferably, it is 40-100 weight part.

  It is preferable to adjust the amount of the component (E) within the above range because the viscosity and viscosity of the photosensitive resin composition can be adjusted within a range suitable for coating such as screen printing.

  When the component (E) is less than the above range, the viscosity of the photosensitive resin composition becomes very high, coating becomes difficult, and foam entrainment at the time of coating may be inferior in leveling. Moreover, when there are more (E) components than the said range, the viscosity of the photosensitive resin composition will become very low, coating will become difficult and it may be inferior to the coverage of a circuit.

<(F) Flame retardant that is solid at room temperature and insoluble in components (A) to (E)>
The flame retardant that is solid at room temperature and insoluble in the components (A) to (E) in the present invention is a fine particle that is solid at room temperature and insoluble in the components (A) to (E). It is a compound in which the composition exhibits flame retardancy when it is blended. Examples include, but are not limited to, metal hydroxides, metal oxides, metal salt flame retardants, red phosphorus flame retardants, phosphinates, melamine flame retardants, and metal powders. Particularly preferred are metal hydroxides and phosphinates.

  The metal hydroxide in the present invention is a compound containing crystal water in the molecule, and examples thereof include aluminum hydroxide, magnesium hydroxide, calcium hydroxide, zinc borate, and zinc hydroxystannate. These can be used alone or in combination of two or more. Of these, aluminum hydroxide or magnesium hydroxide is particularly preferable because high flame retardancy is obtained.

  The average particle diameter of the metal hydroxide in the present invention is preferably 0.8 μm to 10 μm, more preferably 0.8 μm to 5 μm, and particularly preferably 0.8 μm to 3 μm.

  By adjusting the average particle diameter of the metal hydroxide within the above range, the viscosity and viscosity of the photosensitive resin composition can be adjusted within a range suitable for coating such as screen printing, which is preferable.

  When the average particle diameter of the metal hydroxide is smaller than the above range, the viscosity and viscosity of the photosensitive resin composition increase, and the entrainment of bubbles during coating and the leveling property may be inferior. Further, when the average particle size of the metal hydroxide is larger than the above range, the transparency of the photosensitive resin composition is lowered and the light transmittance is lowered, so that the photosensitivity is lowered and the appearance of the cured film is reduced. May be worsened.

  In the present invention, the thermal decomposition starting temperature of the metal hydroxide is preferably 280 ° C. or higher, more preferably 300 ° C. or higher, and particularly preferably 320 ° C. or higher. When the thermal decomposition starting temperature is lower than 280 ° C., when a photosensitive resin composition containing a metal hydroxide is used as an insulating protective film of a printed wiring board, it is insulated at a high temperature of about 260 ° C. in a solder reflow process. When the film is exposed, the metal hydroxide contained in the insulating film releases crystal water, which may cause swelling and peeling of the surface of the insulating film.

  As the metal hydroxide in the present invention, a metal hydroxide that has been surface-treated with a surface treatment agent can also be used. As the surface treatment agent, a silane coupling agent such as vinyl silane, epoxy silane, amino silane, or mercapto silane can be used.

  The average particle diameter in the present invention is a particle diameter corresponding to 50% of the cumulative distribution on a volume basis, and can be measured, for example, by a laser diffraction particle size distribution measurement method.

  In the present invention, the thermal decomposition start temperature is a temperature at which a compound starts thermal decomposition. For example, a weight change is measured while heating at a constant rate in an inert gas atmosphere using a thermogravimetric analyzer, It can be measured as a decrease start temperature.

  The phosphinic acid salt in the present invention is a compound represented by the following general formula (15).

(In the formula, R ₅ and R ₆ each independently represent a linear or branched alkyl group having 1 to 6 carbon atoms or an aryl group, and M represents Mg, Ca, Al, Sb, Sn, Ge, Ti. , Fe, Zr, Zn, Ce, Bi, Sr, Mn, Li, Na, and K represent metals selected from the group consisting of at least one of t.

  Examples of the phosphinic acid salt include aluminum trisdiethylphosphinate, aluminum trismethylethylphosphinate, aluminum trisdiphenylphosphinate, zinc bisdiethylphosphinate, zinc bismethylethylphosphinate, zinc bisdiphenylphosphinate, bisdiethyl Examples thereof include titanyl phosphinate, titanyl bismethylethylphosphinate, titanyl bisdiphenylphosphinate, and these can be used alone or in combination of two or more. Of these, aluminum trisdiethylphosphinate and aluminum trismethylethylphosphinate are particularly preferable because high flame retardancy can be obtained.

  The average particle diameter of the phosphinic acid salt in the present invention is preferably 0.8 μm to 10 μm, more preferably 0.8 μm to 5 μm, and particularly preferably 0.8 μm to 3 μm.

  By adjusting the average particle diameter of the phosphinate within the above range, it is preferable because the viscosity and viscosity of the photosensitive resin composition can be adjusted within a range suitable for coating such as screen printing.

  When the average particle diameter of the phosphinic acid salt is smaller than the above range, the viscosity and viscosity of the photosensitive resin composition increase, and the entrainment of bubbles during coating and the leveling property may be inferior. Further, when the average particle diameter of the phosphinic acid salt is larger than the above range, the transparency of the photosensitive resin composition is lowered and the light transmittance is lowered, so that the photosensitivity is lowered and the appearance of the cured film is reduced. It may cause deterioration.

  The thermal decomposition start temperature of the phosphinic acid salt in the present invention is preferably 280 ° C. or higher, more preferably 300 ° C. or higher, and particularly preferably 320 ° C. or higher. When the thermal decomposition starting temperature is lower than 280 ° C., when a photosensitive resin composition containing phosphinate is used as an insulating protective film for a printed wiring board, the insulating film is heated to a high temperature of about 260 ° C. in the solder reflow process When the film is exposed, the phosphinate contained in the insulating film may release decomposition gas, which may cause the surface of the insulating film to swell or peel off.

  As the phosphinic acid salt in the present invention, those subjected to surface treatment with a surface treatment agent can also be used. As the surface treatment agent, a silane coupling agent such as vinyl silane, epoxy silane, amino silane, or mercapto silane can be used.

  The component (F) in the photosensitive resin composition of the present invention is preferably 1 to 100 with respect to 100 parts by weight of the total of the component (A), the component (B), the component (C), and the component (D). Parts by weight, more preferably 5 to 50 parts by weight, and particularly preferably 10 to 30 parts by weight.

  By adjusting the amount of component (F) within the above range, sufficient flame retardancy is imparted to the photosensitive resin composition, and the viscosity and viscosity of the photosensitive resin composition are suitable for coating such as screen printing. Since it can adjust within the range, it is preferable.

  When the component (F) is less than the above range, the flame retardancy of the cured film obtained by curing the photosensitive resin composition may be inferior. Moreover, when there are more (F) components than the said range, the viscosity of the photosensitive resin composition will become very high, and coating may become difficult.

<(G) Thermosetting resin>
The (G) thermosetting resin in the present invention is a compound that generates a crosslinked structure by heating and functions as a thermosetting agent. For example, thermosetting resins such as epoxy resin, bismaleimide resin, bisallyl nadiimide resin, acrylic resin, methacrylic resin, hydrosilyl cured resin, allyl cured resin, unsaturated polyester resin; allyl on the side chain or terminal of polymer chain A side chain reactive group type thermosetting polymer having a reactive group such as a group, a vinyl group, an alkoxysilyl group, and a hydrosilyl group can be used. What is necessary is just to use the said thermosetting component, ie, (G) thermosetting resin, combining suitably 1 type (s) or 2 or more types.

  (G) Among these, it is more preferable to use an epoxy resin as the thermosetting resin. By containing an epoxy resin component, heat resistance can be imparted to a cured film obtained by curing the photosensitive resin composition, and adhesion to a conductor such as a metal foil or a circuit board can be imparted.

  The epoxy resin is a compound containing at least two epoxy groups in the molecule. For example, as a bisphenol A type epoxy resin, product names jER828, jER1001, jER1002, and ADEKA manufactured by Japan Epoxy Resin Co., Ltd. Trade names of Adeka Resin EP-4100E, Adeka Resin EP-4300E, trade names RE-310S and RE-410S manufactured by Nippon Kayaku Co., Ltd., trade names Epicron 840S, Epicron 850S, Epicron 1050 and Epicron 7050 manufactured by Dainippon Ink, Inc. The product names Epototo YD-115, Epototo YD-127, Epototo YD-128, and bisphenol F type epoxy resins manufactured by Toto Kasei Co., Ltd. are trade names jER806 and jER8 manufactured by Japan Epoxy Resin Co., Ltd. 7. 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, manufactured by Nippon Kayaku Co., Ltd. Product names Epicron 830 and Epicron 835 manufactured by Nippon Ink 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. Trade name Epiklon EXA-1514 manufactured by Japan, Hydrogenated bisphenol A type epoxy resin includes Japan Epoxy Resin Co., Ltd. trade names jERYX8000, jERYX8034, jERYL7170, ADEKA Co., Ltd. trade names Adeka Resin P-4080E, Dainippon Ink Co., Ltd. trade name Epicron EXA-7015, Toto Kasei Co., Ltd. trade name Epototo YD-3000, Epototo YD-4000D, biphenyl type epoxy resin, manufactured by Japan Epoxy Resin Co., Ltd. Trade names jERYX4000, jERYL6121H, jERYL6640, jERYL6677, trade names NC-3000 and NC-3000H manufactured by Nippon Kayaku Co., Ltd., and phenoxy type epoxy resins include trade names jER1256, jER4250, jER4275, and naphthalene manufactured by Japan Epoxy Resins Co., Ltd. As the type epoxy resin, trade names “Epicron HP-4032”, “Epicron HP-4700”, “Epicron HP-4200” manufactured by Dainippon Ink Co., Ltd., “NC-” manufactured by Nippon Kayaku Co., Ltd. As 7000L, phenol novolac type epoxy resin, trade names jER152 and jER154 manufactured by Japan Epoxy Resin Co., Ltd., trade name EPPN-201-L manufactured by Nippon Kayaku Co., Ltd., trade name Epicron N- manufactured by Dainippon Ink Co., Ltd. 740, Epicron N-770, Toto Kasei Co., Ltd. trade name Epototo YDPN-638, Cresol novolac type epoxy resin, Nippon Kayaku Co., Ltd. trade names EOCN-1020, EOCN-102S, EOCN-103S, EOCN -104S, trade names manufactured by Dainippon Ink Co., Ltd. Epicron N-660, Epicron N-670, Epicron N-680, Epicron N-695, and Trisphenolmethane type epoxy resin are trade names of Nippon Kayaku Co., Ltd. EPPN-501H, EPP -501HY, EPPN-502H, dicyclopentadiene type epoxy resin, Nippon Kayaku Co., Ltd. trade name XD-1000, Dainippon Ink Co., Ltd. trade name Epicron HP-7200, amine type epoxy resin, Product names of Toto Kasei Co., Ltd. Epototo YH-434, Epototo YH-434L, and flexible epoxy resins include trade names jER871, jER872, jERYL7175, jERYL7217, manufactured by Dainippon Ink, Inc. As the name Epicron EXA-4850, urethane-modified epoxy resin, trade names of Adeka Resin EPU-6, Adeka Resin EPU-73, Adeka Resin EPU-78-11 manufactured by ADEKA Corporation, and ADE Co., Ltd. as ADE Co., Ltd. Product names Adeka Resin EPR-4023, Adeka Resin EPR-4026, Adeka Resin EPR-1309, and chelate-modified epoxy resins manufactured by A include Adeka Resin EP-49-10, Adeka Resin EP-49-20, etc., manufactured by ADEKA Corporation. It is done.

  Although it does not specifically limit as a hardening | curing agent of the said thermosetting compound in the photosensitive resin composition of this invention, For example, phenol resins, such as a phenol novolak resin, a cresol novolak resin, a naphthalene type phenol resin, an amino resin, and a urea resin , Melamine, dicyandiamide and the like, 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.

  The component (G) in the photosensitive resin composition of the present invention is preferably 0.5 parts per 100 parts by weight of the sum of the components (A), (B), (C), and (D). -100 parts by weight, more preferably 1-50 parts by weight, particularly preferably 5-20 parts by weight.

  By adjusting the amount of the component (G) within the above range, it is preferable because the heat resistance, chemical resistance and electrical insulation reliability of the cured film obtained by curing the photosensitive resin composition can be improved. .

  When the component (G) is less than the above range, the cured film obtained by curing the photosensitive resin composition may be inferior in heat resistance and electrical insulation reliability. Moreover, when there are more (G) components than the said range, the cured film obtained by hardening the photosensitive resin composition may become weak, it is inferior to a softness | flexibility, and the curvature of a cured film may also become large.

  In the photosensitive resin composition of the present invention, an inorganic filler can be used for the purpose of improving the adhesion and the hardness of the cured film. The inorganic filler is not particularly limited, and examples thereof include barium sulfate, barium titanate, talc, ultrafine anhydrous silica, synthetic silica, natural silica, calcium carbonate, magnesium carbonate, and aluminum oxide. It can be used alone or in combination of two or more.

  In the photosensitive resin composition of the present invention, additives such as an antifoaming agent, a leveling agent, a colorant, an adhesion imparting agent, and a polymerization inhibitor can be used as necessary. These additives are not particularly limited. For example, as an antifoaming agent, a silicon compound, an acrylic compound, as a leveling agent, a silicon compound, an acrylic compound, as a colorant, a phthalocyanine compound, Examples of the azo compound, carbon black, titanium oxide, and adhesion imparting agent include silane coupling agents, triazole compounds, tetrazole compounds, triazine compounds, and polymerization inhibitors include hydroquinone and hydroquinone monomethyl ether. These can be used alone or in combination of two or more.

  The photosensitive resin composition of the present invention is obtained by uniformly mixing the components (A) to (G). As a method of uniformly mixing, for example, a general kneading apparatus such as a three roll or bead mill apparatus may be used for mixing. Moreover, when the viscosity of a solution is low, you may mix using a general stirring apparatus.

  The photosensitive resin composition of the present invention can form a pattern as follows. First, the photosensitive resin composition is applied onto a substrate and dried to remove the organic solvent. The substrate can be applied by screen printing, roller coating, curtain coating, spray coating, spin coating using a spinner, or the like. The coating film (preferably having a thickness of 5 to 100 μm) is dried at 120 ° C. or lower, preferably 40 to 100 ° C. 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 pattern can be obtained by washing the unexposed portion with a developing solution using various methods such as shower, paddle, dipping or ultrasonic waves. Since the time until the pattern is exposed varies depending on the spray pressure and flow velocity of the developing device and the temperature of the developer, it is preferable to find the optimum device conditions as appropriate.

  As the developer, an aqueous alkali solution is preferably used. The developer is water-soluble such as methanol, ethanol, n-propanol, isopropanol, N-methyl-2-pyrrolidone and the like. An organic solvent may be contained. 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, 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, trii Propylamine and the like, aqueous solution compound other than this as long as it exhibits basicity can also be used.

  The concentration of the alkaline compound that can be suitably used in the development step of the photosensitive resin composition of the present invention is preferably 0.01 to 10% by weight, particularly preferably 0.05 to 5% by weight. preferable. Further, the temperature of the developer depends on the composition of the photosensitive resin composition and the composition of the developer, and is generally 0 ° C. or higher and 80 ° C. or lower, more generally 20 ° C. or higher and 50 ° C. or lower. It is preferable to use it.

  The pattern formed by the development step is rinsed to remove unnecessary developer residue. Examples of the rinsing liquid include water and acidic aqueous solutions.

  Next, a cured film rich in heat resistance and flexibility can be obtained by performing heat curing treatment. Although a cured film is determined in consideration of wiring thickness etc., it is preferable that thickness is about 2-50 micrometers. The final curing temperature at this time is desired 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 heat 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 190 ° C. or lower. When the final heating temperature becomes high, the wiring may be oxidized and deteriorated.

  A pattern comprising a cured film formed from the photosensitive resin composition of the present invention is excellent in heat resistance, flame retardancy, electrical and mechanical properties, and is particularly excellent in flexibility. For example, the insulating film of the present invention preferably has a thickness of about 2 to 50 μm and a resolution of at least 10 μm after photocuring, and particularly a resolution of about 10 to 1000 μm. For this reason, the insulating film of the present invention is particularly suitable as an insulating material for a high-density flexible substrate. Furthermore, it is used for various photo-curing type 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 photosensitive film obtained by apply | coating the said photosensitive resin composition to the base-material surface, and drying.

  EXAMPLES Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited to these examples.

<Synthesis of terminal carboxylic acid urethane imide oligomer>
[Synthesis Example 1]
In a separable flask pressurized with nitrogen, methyltriglyme (17.5 g) was charged as a solvent for polymerization, and 20.7 g (0.1004 mol) of norbornene diisocyanate was charged therein and heated to 80 ° C. And dissolved. To this solution, 50.0 g (0.025 mol) of polycarbonate diol (manufactured by Asahi Kasei Co., Ltd .: trade name PCDL T5652, polycarbonate diol represented by the following general formula (16), average molecular weight 2000) and dimethylolbutane A solution of 8.1 g (0.050 mol) of acid (2,2-bis (hydroxymethyl) butanoic acid) in methyltriglyme (50.0 g) was added over 1 hour.

(In the formula, q, r, and s are integers of 1 or more.)

This solution was heated to reflux for 5 hours. The above reaction solution is referred to as Intermediate A.

  In a reactor different from the reactor used for the above reaction, 52.0 g of 2,2-bis [4- (3,4-dicarboxyphenoxy) phenyl] propane dianhydride (hereinafter abbreviated as BPADA) ( 0.100 mol) and methyltriglyme (52.0 g) were added, heated to 80 ° C. and dispersed in methyltriglyme.

  The intermediate A was added to the solution over 1 hour and allowed to react. After the addition, the mixture was heated to 200 ° C. and reacted for 3 hours. The terminal acid anhydride urethane imide oligomer solution was obtained by performing the said reaction. To this solution, 7.2 g (0.400 mol) of pure water was added and heated to reflux at 80 ° C. for 5 hours to obtain a terminal carboxylic acid urethane imide oligomer solution. This synthetic resin is abbreviated as resin A.

[Synthesis Example 2]
In Synthesis Example 1, 7.2 g (0.400 mol) of pure water charged after the reaction was changed to 12.8 g (0.400 mol) of methanol and half-esterified to obtain a terminal carboxylic acid urethane imide oligomer solution. This synthetic resin is abbreviated as resin B.

[Examples 1 to 6]
<Preparation of photosensitive resin composition>
(A) terminal carboxylic acid urethane imide oligomer solution obtained in Synthesis Examples 1 and 2, (B) diamino compound and / or isocyanate compound, (C) photosensitive resin, (D) photopolymerization initiator, (E) A photosensitive resin composition was prepared by adding an organic solvent, (F) a flame retardant, (G) a thermosetting resin, and other components. Table 1 shows the blending amount of each constituent raw material in the resin solid content and the kind of the raw material. In addition, 1,2-bis (2-methoxyethoxy) ethane which is a solvent in the table is the total amount of solvent including the solvent and the like contained in the above synthetic resin solution and the like. The following evaluation was carried out by completely defoaming the foam in the solution with a defoaming device.

<1> Product name of isocyanate compound manufactured by Mitsui Chemicals Polyurethane Co., Ltd. <2> Product name NK Ester A-9300 (ethoxylated isocyanuric acid triacrylate) manufactured by Nakamura Chemical Co., Ltd.
<3> Product name NK ester BPE-1300 (bisphenol A EO-modified diacrylate) manufactured by Nakamura Chemical Co., Ltd. Molecular weight: 1684
<4> Product name of photopolymerization initiator manufactured by Ciba Specialty Chemicals <5> Product name of flame retardant (special heat-resistant aluminum hydroxide) manufactured by Navaltech Co., Ltd. Average particle size: 0.9 μm Thermal decomposition start temperature: 350 ° C.
<6> Product name of flame retardant (magnesium hydroxide composite metal hydroxide) manufactured by Tateho Chemical Industry Co., Ltd. Average particle size: 1.5 μm Thermal decomposition start temperature: 320 ° C.
<7> Product name of flame retardant (phosphinic acid salt) manufactured by Clariant Co., Ltd. Average particle size: 2-3 μm Thermal decomposition start temperature: 300 ° C. or higher <8> Product of cresol novolac type polyfunctional epoxy resin manufactured by Dainippon Ink Co., Ltd. Name <9> Product name of Nippon Aerosil Co., Ltd. silica particle

<Preparation of coating film on polyimide film>
The above photosensitive resin composition was cast and applied to an area of 100 mm × 100 mm on a 75 μm polyimide film (manufactured by Kaneka Corporation: trade name 75 NPI) using a Baker type applicator so that the final dry thickness was 25 μm. After drying at 80 ° C. for 20 minutes, a negative photomask having a line width / space width of 50 mm × 50 mm = 100 μm / 100 μm was placed and irradiated with ultraviolet rays with an integrated exposure amount of 300 mJ / cm ² for exposure. Next, spray development was performed for 60 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 cured by heating in an oven at 160 ° C. for 90 minutes to prepare a cured film of the photosensitive resin composition.

<Evaluation of cured film>
The obtained cured film was evaluated for the following items. The evaluation results are shown in Table 2.

(I) Photosensitivity evaluation The photosensitivity evaluation of the photosensitive resin composition was determined by observing the surface of the cured film obtained in the above item <Preparation of coating film on polyimide film>.
◯: A clear photosensitive pattern with a line width / space width = 100/100 μm is drawn on the polyimide film surface, the line does not shake due to the peeling of the line portion, and there is no residual residue in the space portion. thing.
Δ: A clear line width / space width = 100/100 μm photosensitive pattern is drawn on the polyimide film surface, and the line portion is shaken due to peeling, but there is no undissolved residue in the space portion. thing.
×: A clear line width / space width = 100/100 μm photosensitive pattern was not drawn on the surface of the polyimide film, the line portion was peeled off, and a dissolution residue was generated in the space portion.

(Ii) Adhesiveness of cured film The adhesive strength of the cured film obtained in the above item <Preparation of coating film on polyimide film> was evaluated by a cross-cut tape method according to JIS K5400.
○: Not peeled off by cross-cut tape method Δ: 95% or more of the mesh remains ×: Residual amount of the mesh is less than 80% (iii) Solvent resistance Above <Coating on polyimide film Evaluation of solvent resistance of the cured film obtained in the item “Production of film>” was performed. In the evaluation method, the film was dipped in methyl ethyl ketone at 25 ° C. for 15 minutes and then air-dried to observe the state of the film surface.
○: There is no abnormality in the coating film.
X: Abnormality such as swelling or peeling occurs in the coating film.

(Iv) Flexibility A cured film laminated film of a photosensitive resin composition on the surface of a polyimide film having a thickness of 25 μm (Apical 25NPI manufactured by Kaneka Corporation) in the same manner as in the above item <Preparation of coating film on polyimide film>. Was made. The cured film laminated film was cut into a 30 mm × 10 mm strip, bent 10 times at 180 ° at 15 mm, and the coating film was visually confirmed to check for cracks.
○: The cured film has no cracks Δ: The cured film has some cracks ×: The cured film has cracks

(V) Insulation reliability Line width / space width = 100 μm on flexible copper-clad laminate (copper foil thickness 12 μm, polyimide film is Apical 25 NPI manufactured by Kaneka Co., Ltd., and copper foil is bonded with polyimide adhesive) A / 100 μm comb-shaped pattern was prepared, immersed in a 10% by volume sulfuric acid aqueous solution for 1 minute, washed with pure water, and subjected to a copper foil surface treatment. Then, the cured film of the photosensitive resin composition was produced on the comb pattern by the method similar to the above-mentioned <Preparation of the coating film on a polyimide film> method, and the test piece was adjusted. A 100 V direct current was applied to both terminals of the test piece in an environmental test machine at 85 ° C. and 85% RH, and changes in the insulation resistance value and occurrence of migration were observed.
○: A resistance value of 10 8 or more in 1000 hours after the start of the test and no occurrence of migration, dendrite, etc. ×: An occurrence of migration, dendrite, etc. in 1000 hours after the start of the test

(Vi) Wettability The wettability of the cured film obtained in the above item <Preparation of coating film on polyimide film> was evaluated according to JIS K6768.

(Vii) Solder heat resistance A cured film of a photosensitive resin composition is laminated on the surface of a 75 μm-thick polyimide film (Apical 75NPI manufactured by Kaneka Corporation) in the same manner as in the above item <Preparation of coating film on polyimide film>. A film was prepared.

The coated film was floated so that the surface coated with the cured film of the photosensitive resin composition was in contact with a solder bath completely dissolved at 260 ° C., and then pulled up 10 seconds later. The operation was performed three times, and the adhesive strength of the cured film was evaluated by a cross-cut tape method according to JIS K5400.
○: No peeling by cross-cut tape method Δ: 95% or more of the squares remain ×: The residual quantity of the squares is less than 80%

(Viii) Warpage A cured film laminated film of a photosensitive resin composition is applied to the surface of a 25 μm-thick polyimide film (Apical 25NPI manufactured by Kaneka Corporation) in the same manner as in the above item <Preparation of coating film on polyimide film>. Produced.

  The cured film was cut into a film having an area of 50 mm × 50 mm and placed on a smooth table so that the coating film was on the upper surface, and the warp height of the film edge was measured. A schematic diagram of the measurement site is shown in FIG. The smaller the amount of warpage on the polyimide film surface, the smaller the stress on the surface of the printed wiring board and the lower the amount of warping of the printed wiring board. The warp amount is preferably 5 mm or less.

(Ix) Flame retardancy In accordance with the flame retardancy test standard UL94 for plastic materials, a flame retardancy test was performed as follows. A cured film laminated film of a photosensitive resin composition was prepared on both sides of a polyimide film having a thickness of 25 μm (Apical 25NPI manufactured by Kaneka Corporation) in the same manner as in the above item <Preparation of coating film on polyimide film>. Cut out the sample prepared above into dimensions: 50 mm width x 200 mm length x 75 μm thickness (including the thickness of the polyimide film), put a marked line in the 125 mm part, round it into a cylinder with a diameter of about 13 mm, and above the marked line PI tape was affixed so that there was no gap in the overlapping part (75 mm location) and the upper part, and 20 flame retardant test tubes were prepared. Of these, 10 were treated at (1) 23 ° C./50% relative humidity / 48 hours, and the remaining 10 were treated at (2) 70 ° C. for 168 hours and then cooled in a desiccator containing anhydrous calcium chloride for 4 hours or more. The upper part of these samples is clamped and fixed vertically, and a burner flame is brought close to the lower part of the sample for 10 seconds to ignite. After 10 seconds, remove the burner flame and measure how many seconds after the flame or burning of the sample has disappeared.
○: For each condition ((1), (2)), the flame and combustion stopped within 5 seconds on average (average of 10) after the flame of the burner was moved away from the sample, and self-extinguishment within 10 seconds at maximum X: Some samples do not extinguish within 10 seconds, or flame rises to the top of the sample and burns

(X) Bleed-out The test piece after the above insulation reliability test was observed to observe a minute bulge on the surface of the test piece, a bulge on the copper wiring, a seepage of oily substances, and the like.
○: Swelled on the surface of the test piece and the copper wiring in 1000 hours after the start of the test, and no abnormality such as oozing out was observed. Any abnormalities such as

[Comparative Example 1]
A glass flask having a capacity of 2000 ml was charged with 176.09 g (598.5 mmol) of 3,3 ′, 4,4′-biphenyltetracarboxylic dianhydride and 254.26 g of methyltriglyme under a nitrogen atmosphere at 180 ° C. And stirred with heating. α, ω-bis (3-aminopropyl) polydimethylsiloxane (manufactured by Shin-Etsu Chemical Co., Ltd., KF8010, average molecular weight 830) 250.25 g (301.5 mmol) and 100 g of methyltriglyme were added and stirred uniformly at 180 ° C. for 60 minutes. Went. Further, 42.51 g (148.5 mmol) of bis (3-carboxy, 4-aminophenyl) methane and 100 g of methyltriglyme were added to this reaction solution, and the mixture was heated and stirred at 180 ° C. for 6 hours. This solution is a half-esterified solution.

  Separately from the above reaction apparatus, in a glass container with a capacity of 500 ml blocked from light, isocyanuric acid tris (2-acryloyloxyethyl) [manufactured by Toagosei Co., Ltd., M-315] 126.9 g (300 mmol) and methyl jig 120 g of lime was charged and stirred and dissolved at room temperature in a nitrogen atmosphere. Next, 83.0 g (100 mmol) of α, ω-bis (3-aminopropyl) polydimethylsiloxane (manufactured by Shin-Etsu Chemical Co., Ltd., KF8010, average molecular weight 830) and 52.9 g of diglyme were added, and the mixture was further stirred for 2 hours. A reaction solution of a photosensitive monomer in which one tris (2-acryloyloxyethyl) isocyanurate was added to both ends of diaminopolysiloxane was obtained. This solution is used as a photosensitive monomer solution.

  Next, 1.25 g of 2-hydroxyethyl methacrylate and 15.39 g of a photosensitive monomer solution are added to 50 g of this half esterified solution, and 2.57 g of Irgacure 907 (manufactured by Ciba Specialty Chemicals Co., Ltd.) is used as a photopolymerization initiator. 2,4-diethylthioxanthone (Nippon Kayaku Co., Ltd., DETX) 0.51 g, p-dimethylaminobenzoic acid ethyl ester (Nippon Kayaku Co., Ltd., EDMAB) 1.02 g, silicon-based antifoaming agent (Dow Corning) , DB-100) 0.13 g, Aerosil (average particle size: 0.01 μm) 2.56 g, and talc (average particle size: 1.8 μm) 5.19 g were charged and stirred at room temperature (25 ° C.) for 2 hours. The mixture was allowed to stand for 1 hour, and then uniformly mixed by a three roll mill to obtain a photosensitive imidosiloxane oligomer composition.

  50 g of this photosensitive imidosiloxane oligomer composition, 3.2 g of epoxy resin (Japan Epoxy Resin Co., Ltd., Epicoat 152) and 0.032 g of 2-ethyl-4-methylimidazole were added and stirred at room temperature for 1 hour, A functional resin composition was obtained.

  The physical properties of this composition were evaluated in the same manner as in Example 1. The results are listed in Table 3.

[Comparative Example 2]
After introducing air into a reaction vessel equipped with a stirrer, a thermometer, a cooling tube and an air introduction tube, 196.8 parts of polycarbonate diol (Daicel Chemical Industries, Plaxel CD205PL, average molecular weight 500), dimethylolbutanoic acid ( (Mitsubishi Chemical Corporation) 58.3 parts, diethylene glycol (Nisso Maruzen Chemical Co., Ltd.) 37.6 parts, 1,4-cyclohexanedimethanol monoacrylate (Mitsubishi Chemical Corporation) 148.1 parts, 0.55 part of p-methoxyphenol (manufactured by Wako Pure Chemical Industries, Ltd.), 0.55 part of dibutyltin laurate (manufactured by Tokyo Fine Chemical Co., Ltd., L101) and 110.2 parts of methyl ethyl ketone (manufactured by Tonen Chemical Co., Ltd.) Was heated to 65 ° C. with stirring under an air stream. 305.9 parts of trimethylhexamethylene diisocyanate (manufactured by Huls Japan Co., Ltd., VESTANATM TMDI) was charged into the dropping vessel and uniformly dropped into the reaction vessel over 3 hours while maintaining the temperature at 65 ± 3 ° C. After completion of the dropping, the dropping container was washed with 76.5 parts of methyl ethyl ketone, and the washing solution was directly put into the reaction container. The mixture was further kept warm for 2 hours with stirring, and then heated to 75 ° C. Thereafter, stirring and heating were continued at 75 ± 3 ° C. until the isocyanate peak in the infrared absorption spectrum disappeared. The isocyanate peak disappeared in about 6 to 8 hours. After confirming the disappearance of this peak, the temperature was lowered to 60 ° C., 9.3 parts of methanol (manufactured by Wako Pure Chemical Industries, Ltd.) was added, and the mixture was kept at 60 ± 3 ° C. for 30 minutes. Thereafter, 56.4 parts of methyl ethyl ketone was added to obtain a transparent resin solution. This resin had a solid content of 75.6%, an acid value of 22.2 mg KOH / g, and a viscosity of 1,810 cP. 62.5 g of the obtained resin solution (solid content 50 g), 2,2′-bis (4-methacryloxypentaethoxyphenyl) propane 30 g, (methacrylic acid, methyl methacrylate and butyl acrylate in a weight ratio of 22:71 : A copolymer having a weight average molecular weight of 80,000 and an acid value of 143 mgKOH / g copolymerized at a ratio of 7 was dissolved in methyl cellosolve / toluene (6/4, weight ratio) to a solid content of 40% by weight. 162.5 g (solid content 65 g), benzophenone 3.5 g, N, N′-tetraethyl-4,4′-diaminobenzophenone 0.1 g, hexamethylene-based isocyanurate type isocyanate compound is reacted with methyl ethyl ketone oxime. 20 g of a 75 wt% methyl ethyl ketone solution of the blocked isocyanate compound obtained 15g), CR747 (condensed phosphoric acid ester-based additive-type flame retardant) 40 g, and stirred for 1 hour at room temperature in acetone 85 g, to obtain a photosensitive resin composition.

  The physical properties of this composition were evaluated in the same manner as in Example 1. The results are listed in Table 3.

[Comparative Example 3]
In a reaction vessel equipped with a stirrer, a thermometer, and a condenser, polytetramethylene glycol (Hodogaya Chemical Co., Ltd., PTMG-850, molecular weight 850), 2550 g (= 3 mol), dimethylolpropion as a dihydroxy compound having a carboxyl group 670 g (= 5 mol) of acid, 1776 g (= 8 mol) of isophorone diisocyanate as polyisocyanate, 2-hydroxyethyl acrylate as (meth) acrylate having a hydroxyl group, 238 g (= 2.05 mol), p-methoxyphenol and 1.0 g each of di-t-butyl-hydroxytoluene was added. The mixture was stopped by heating to 60 ° C. while stirring, and 1.6 g of dibutyltin dilaurate was added. When the temperature in the reaction vessel starts to decrease, the mixture is heated again and stirred at 80 ° C., and the reaction is completed after confirming that the absorption spectrum of the isocyanate group (2280 cm −1) has disappeared in the infrared absorption spectrum. A carboxyl group-containing photosensitive prepolymer having a solid content acid value of 46 mgKOH / g and a solid content concentration of 60% was obtained. The viscosity (25 ° C.) of this product was 25000 mPa · s. The obtained resin solution is designated as UA-1.

  In another reaction vessel, 800 g (= 1 mol) of a polycarbonate diol (molecular weight 800) containing 1: 1 units derived from hexamethylene carbonate and pentamethylene carbonate as a polymer polyol, and dimethylol as a dihydroxy compound having a carboxyl group 938 g (= 7 mol) of propionic acid, 1998 g (= 9 mol) of isophorone diisocyanate as a polyisocyanate, and 238 g (= 2.05 mol) of 2-hydroxyethyl acrylate as a (meth) acrylate having a hydroxyl group were charged with the UA-1 Resin was synthesized in the same manner as described above. The number average molecular weight of the obtained resin (UA-2) was 18,000, and the solid content acid value was 90 mgKOH / g.

  16.0 g of UA-1 in terms of solid content, 12.0 g of UA-2 in terms of solid content, 3.0 g of dipentaerythritol hexaacrylate (manufactured by Toagosei Co., Ltd., M-400), urethane acrylate (Daicel) Chemical Industry Co., Ltd., EB1290K) 6.0 g, 2,4,6-trimethylbenzoylphenylphosphine oxide (BASF, TPO) 1.0 g, 2-benzyl-2-dimethylamino-1- (4-morpho Linophenyl) -butanone-1 (Ciba Specialty Chemicals, Irgacure 369) 1.0 g, 1-hydroxy-cyclohexyl-phenyl-ketone (Ciba Specialty Chemicals Irgacure 184) 1.0 g, Hydrated metal compounds (shown by Showa Denko KK, aluminum hydroxide Hydrite H-43M) 16.0 g of bisphenol A brominated epoxy resin (Japan Epoxy Resin Co., Ltd., Epicoat E-5050), 12.0 g of condensed phosphate ester added flame retardant (Daihachi Chemical Industry) After adding 3.4 g of PX-200 (made by Co., Ltd.), 6.0 g of biphenyl type epoxy resin (manufactured by Japan Epoxy Resin Co., Ltd., YL6121H) and 1.0 g of melamine and stirring for 1 hour at room temperature, a three roll mill To obtain a photosensitive resin composition.

  The physical properties of this composition were evaluated in the same manner as in Example 1. The results are listed in Table 3.

Schematic diagram measuring the amount of warping of the film

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Polyimide film which laminated the photosensitive resin composition 2 Warpage amount 3 Smooth stand

Claims (14)

  At least (A) terminal carboxylic acid urethane imide oligomer, (B) diamino compound and / or isocyanate compound, (C) photosensitive resin, (D) photopolymerization initiator, (E) organic solvent, and (F) at room temperature. A photosensitive resin composition comprising a flame retardant which is solid and insoluble in the components (A) to (E).   The photosensitive resin composition according to claim 1, wherein the (A) terminal carboxylic acid urethane imide oligomer is a tetracarboxylic acid urethane imide oligomer. The (A) terminal carboxylic acid urethane imide oligomer is a terminal isocyanate obtained by reacting at least (a) a diol compound represented by the following general formula (1) and (b) a diisocyanate compound represented by the following general formula (2). Next, (c) a tetracarboxylic dianhydride represented by the following general formula (3) is reacted to synthesize a terminal acid anhydride urethane imide oligomer, and (d) water and / or a primary alcohol. The photosensitive resin composition according to claim 1, which is obtained by reacting

(In the formula, R represents a divalent organic group, and l is an integer of 1 to 20.)

(In the formula, X represents a divalent organic group.)

(In the formula, Y represents a tetravalent organic group.) The photosensitive resin composition according to claim 1, wherein the (a) diol compound includes at least a polycarbonate diol represented by the following general formula (4).

(In the formula, plural R _{1 s} each independently represent a divalent organic group, and m is an integer of 1 to 20.)   The said (A) terminal carboxylic acid urethane imide oligomer contains a carboxyl group also in a side chain, The photosensitive resin composition of any one of Claims 1-4 characterized by the above-mentioned.   (A) terminal carboxylic acid urethane imide oligomer, (B) diamino compound and / or isocyanate compound, (C) photosensitive resin and (D) photopolymerization initiator in the above photosensitive resin composition are (A) terminal carboxylic acid. (C) 10 to 200 parts by weight of photosensitive resin, and (D) a photopolymerization initiator, based on 100 parts by weight of the solid content of the acid urethane imide oligomer and (B) diamino compound and / or isocyanate compound. It mix | blends so that it may become 0.1-50 weight part, The photosensitive resin composition of any one of Claims 1-5 characterized by the above-mentioned.   The flame retardant (F) that is solid at room temperature and insoluble in the components (A) to (E) is a metal hydroxide. Photosensitive resin composition.   The flame retardant (F) that is solid at room temperature and insoluble in the components (A) to (E) is a phosphinate, according to any one of claims 1 to 6. Photosensitive resin composition.   The blending ratio of the flame retardant (F) that is solid at room temperature and insoluble in the components (A) to (E) is (A) a terminal carboxylic acid urethane imide oligomer, (B) a diamino compound, and / or an isocyanate type. The compound, (C) the photosensitive resin, and (D) the photopolymerization initiator is blended so as to be 1 to 100 parts by weight with respect to 100 parts by weight of the solid content. 8. The photosensitive resin composition according to 8.   Furthermore, (G) thermosetting resin is contained, The photosensitive resin composition of any one of Claims 1-9 characterized by the above-mentioned.   The blending ratio of the (G) thermosetting resin is (A) a terminal carboxylic acid urethane imide oligomer, (B) a diamino compound and / or an isocyanate compound, (C) a photosensitive resin, and (D) a photopolymerization initiator. The photosensitive resin composition according to claim 10, which is blended so as to be 0.5 to 100 parts by weight with respect to 100 parts by weight of the total solid content.   The resin film obtained by apply | coating the photosensitive resin composition of any one of Claims 1-11 at least to the base-material surface, and drying.   An insulating film obtained by curing the resin film according to claim 12.   The printed wiring board with an insulating film which coat | covered the insulating film of Claim 13 on the printed wiring board.

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