TW202106797A - Curable resin composition - Google Patents

Abstract

Provided are: a curable resin composition which gives cured objects combining excellent heat resistance with dielectric properties; a cured object obtained from the curable resin composition; a prepreg which attains these performances; a circuit board; a build-up film; a semiconductor encapsulant; and a semiconductor device. The curable resin composition of the present invention is characterized by comprising a maleimide (A) having an indane skeleton and a cyanate ester compound (B).

Description

Curable resin composition

The present invention relates to a curable resin composition, a cured product obtained from the aforementioned curable resin composition, a prepreg, a circuit board, a build-up film, a semiconductor packaging material, and a semiconductor device.

As a material for circuit boards for electronic devices, it is widely used: prepreg obtained by impregnating thermosetting resins such as epoxy resin and BT (bismaleimide-tris) resin into glass fiber cloth and heating and drying.物; The prepreg is heated to harden the laminated board; the laminated board and the prepreg are combined to heat the hardened multilayer board. Among them, as the semiconductor packaging substrates are becoming thinner, the warpage of the packaging substrates during mounting becomes a problem. Therefore, in order to suppress this, materials that exhibit high heat resistance are sought.

In addition, in recent years, there has been an advancement in the speed and frequency of signals, and it is desired to provide thermosetting properties that provide hardened products that maintain a sufficiently low dielectric constant in such an environment while exhibiting a sufficiently low dielectric loss tangent. Resin composition.

Particularly recently, in various electrical material applications, especially in cutting-edge material applications, further improvements in performance represented by heat resistance and dielectric properties, as well as materials and compositions with both of these, have been pursued.

In response to these requirements, maleimide resin has attracted attention as a material that has both heat resistance and low dielectric constant and low dielectric loss tangent. However, although the conventional maleimide resin shows high heat resistance, its dielectric constant and dielectric loss tangent value do not reach the level required for cutting-edge material applications. In addition, it is difficult to dissolve in solvents and Since the handling is poor, there is a strong desire to develop resins that exhibit further low dielectric constant and low dielectric loss tangent while maintaining heat resistance, and are also excellent in solvent solubility.

On the other hand, as a cyanate ester-based material that has both high dielectric properties and heat resistance, a blend of phenol novolac type cyanate ester resin, bisphenol A cyanate ester resin, and a non-halogen-based ring is known. Resin composition made of oxy resin (refer to Patent Document 1).

However, although the resin composition described in the aforementioned Patent Document 1 improves the heat resistance and dielectric properties of the cured product to some extent, the heat resistance is still not as high as the level required in recent years. [Prior Technical Literature] [Patent Literature]

[Patent Document 1] JP 2004-182850 A

[The problem to be solved by the invention]

Therefore, the problem to be solved by the present invention is to provide a curable resin composition with a cured product having excellent heat resistance and dielectric properties, a cured product thereof, a prepreg, a circuit board, and a cured product having these properties. Build-up films, semiconductor packaging materials, and semiconductor devices. [Means to solve the problem]

Therefore, the inventors of the present invention have intensively studied in order to solve the above-mentioned problems. As a result, they have found that a curable resin composition containing a maleimide (A) having a dihydroindene skeleton and a cyanate ester compound (B) can be made The hardened product has a low dielectric constant and a low dielectric loss tangent, as well as excellent heat resistance, and the present invention has been completed.

That is, the present invention relates to a curable resin composition characterized by containing a maleimide (A) having a dihydroindene skeleton and a cyanate compound (B).

(式(1)中，Ra各自獨立表示碳數1～10之烷基、烷氧基或烷硫基、碳數6～10之芳基、芳氧基或芳硫基、碳數3～10之環烷基、鹵素原子、硝基、羥基或巰基，q表示0～4之整數值。當q為2～4時，Ra在同一環內可相同亦可相異。Rb各自獨立表示碳數1～10之烷基、烷氧基或烷硫基、碳數6～10之芳基、芳氧基或芳硫基、碳數3～10之環烷基、鹵素原子、羥基或巰基，r表示0～3之整數值。當r為2～3時，Rb在同一環內可相同亦可相異。n係平均重複單元數，表示0.5～20之數值)。The curable resin composition of the present invention preferably has the aforementioned maleimide (A) represented by the following general formula (1).

(In formula (1), Ra each independently represents an alkyl group, alkoxy group or alkylthio group having 1 to 10 carbon atoms, an aryl group having 6 to 10 carbon atoms, aryloxy group or arylthio group, and a carbon number of 3-10 For cycloalkyl, halogen, nitro, hydroxyl or mercapto group, q represents an integer value from 0 to 4. When q is from 2 to 4, Ra may be the same or different in the same ring. Rb each independently represents the number of carbons 1-10 alkyl, alkoxy or alkylthio, aryl with 6-10, aryloxy or arylthio, cycloalkyl with 3-10, halogen atom, hydroxyl or mercapto, r Represents an integer value of 0 to 3. When r is 2 to 3, Rb may be the same or different in the same ring. n is the average number of repeating units and represents a value of 0.5 to 20).

The cured product of the present invention is preferably obtained by curing the aforementioned curable resin composition.

The prepreg of the present invention is preferably a semi-cured product having a reinforcing base material and the aforementioned curable resin composition impregnated in the aforementioned reinforcing base material.

The circuit board of the present invention is preferably obtained by laminating the aforementioned prepreg and copper foil, and performing heating and compression bonding.

The build-up film of the present invention preferably contains the aforementioned curable resin composition.

The semiconductor packaging material of the present invention preferably contains the aforementioned curable resin composition.

The semiconductor device of the present invention preferably includes a cured product obtained by heating and curing the aforementioned semiconductor packaging material. [Effects of Invention]

According to the curable resin composition of the present invention, the cured product obtained from the aforementioned curable resin composition has both excellent heat resistance and dielectric properties, and a curable resin composition having both these properties can be provided. Cured products, prepregs, circuit boards, build-up films, semiconductor packaging materials, and semiconductor devices obtained from the aforementioned curable resin composition are useful.

The present invention will be described in detail below. The present invention relates to a curable resin composition characterized by containing a maleimide (A) having a dihydroindene skeleton and a cyanate compound (B). Among them, the maleimide (A) is preferably represented by the following general formula (1). The aforementioned maleimine (A) has a dihydroindene skeleton. Compared with conventional maleimine, the ratio of polar functional groups in the structure of the aforementioned maleimine (A) is smaller. Therefore, the dielectric properties are excellent, and therefore preferred. In addition, the cured product using the conventional maleimide resin tends to be brittle and may have poor brittleness resistance. However, the maleimide (A) has excellent flexibility due to its indene skeleton. , It is also expected to improve brittle resistance and better.

In the above general formula (1), Ra each independently represents an alkyl group, alkoxy group or alkylthio group having 1 to 10 carbons, an aryl group having 6 to 10 carbons, aryloxy group or arylthio group, and a carbon number of 3 to 10 (preferably 5-10) cycloalkyl group, halogen atom, nitro group, hydroxyl group or mercapto group, q represents an integer value of 0-4. When q is 2 to 4, Ra may be the same or different in the same ring. Rb each independently represents an alkyl group having 1 to 10 carbon atoms, an alkoxy group or an alkylthio group, an aryl group having 6 to 10 carbon atoms, an aryloxy group or an arylthio group, a cycloalkyl group having 3 to 10 carbon atoms, and a halogen atom , Hydroxyl group or mercapto group, r represents an integer value of 0-3. When r is 2 to 3, Rb may be the same or different in the same ring. n is the average number of repeating units and represents a value of 0.5-20. In addition, when the aforementioned r and the aforementioned q are 0, Ra and Rb each refer to a hydrogen atom.

Ra in the above general formula (1) is preferably any one of an alkyl group having 1 to 4 carbons, a cycloalkyl group having 3 to 6 carbons, and an aryl group having 6 to 10 carbons. The number of alkyl groups from 1 to 4 reduces the flatness and crystallinity near the maleimide group, thereby improving the solvent solubility while not impairing the reactivity of the maleimine group. The ideal state of the hardened product is obtained.

In the above general formula (1), 2 to 3 are preferred for q, and 2 is more preferred. When the aforementioned q is 2, the influence of the steric barrier is small, and the electron density on the aromatic ring is increased, which becomes an ideal state in the production (synthesis) of maleimide.

In the above general formula (1), it is preferred that r is 0 and Rb is a hydrogen atom. In addition, r is 1 to 3 and Rb is selected from the group consisting of an alkyl group having 1 to 4 carbons and a cycloalkane having 3 to 6 carbons. And at least one of the group of aryl groups having 6 to 10 carbon atoms is preferred, especially when r is 0 and Rb is a hydrogen atom, when the indene skeleton in the maleimide is formed, There are fewer steric obstacles, which is advantageous for the production (synthesis) of maleimide and becomes an ideal aspect.

<Method for producing maleimide (A) with a dihydroindene skeleton> Hereinafter, the manufacturing method of the aforementioned maleimide (A) will be described.

The following general formula (2) is that Rc each independently represents a monovalent functional group selected from the group consisting of the following general formulas (3) and (4), and at least one of the two Rc is ortho-positioned to a hydrogen atom, Rb and r represent the same compound as described above.

In the following general formula (5), at least one of the ortho and para positions of the amino group is a hydrogen atom, and Ra and q respectively represent the same aniline or its derivative as described above, by making the above general formula (2 The compound of) reacts with the compound of the following general formula (5) in the presence of an acid catalyst to obtain an intermediate amine compound represented by the following general formula (6). In addition, Ra, Rb, q, and r in the following general formula (6) represent the same as those described above.

In the intermediate amine compound represented by the above general formula (6), when the aniline or its derivative represented by the above general formula (5), q is 3 or less, and at least between the ortho and para positions of the amino group When two of them are hydrogen atoms, including the following general formula (7) having a dihydroindene skeleton in the structure becomes a structure represented by the following general formula (8). However, Ra, Rb, q, and r in the following general formula (8) are the same as described above, and m is the number of repeating units and represents an integer value of 1-20. In addition, the structure represented by the following general formula (8) may also be included in the structure of the above general formula (6).

In the dihydroindene skeleton (refer to the above general formula (7)) that is characteristic of the maleimide (A) used in the present invention, in order to have a low melting point (low softening point), low melt viscosity, and excellent workability , The average number of repeating units n is 0.5-20 in terms of the average number of repeating units n (average value), preferably 0.7-10.0, more preferably 0.95-10.0, still more preferably 0.98-9.0, still more preferably 0.99 to 8.0, more preferably 1.0 to 7.0, still more preferably 1.0 to 6.0. By having a dihydroindene skeleton in the structure of the aforementioned maleimide (A), the solvent solubility is excellent compared with the maleimide used so far, which is an ideal state. In addition, as long as the aforementioned n is less than 0.5, the content ratio of the high melting point substance in the structure of the maleimide (A) becomes higher, the solvent solubility is poor, and furthermore, it is a high molecular weight component that contributes to flexibility. The ratio becomes lower, so the brittle resistance of the obtained hardened product is lowered, and the flexibility and softness may also be lowered, which is not good. In addition, if the aforementioned n is greater than 20, the heat resistance may be inferior. Furthermore, the high-molecular-weight component may become too large, and the fluidity may be reduced when the cured product is molded, and the workability may be inferior. In addition, as the value of the aforementioned n, from the viewpoint of high heat distortion temperature, high glass transition temperature, etc., 0.5 to 10.0 is preferable, and 0.95 to 10.0 is more preferable.

The compound represented by the above-mentioned general formula (2) used in the present invention (hereinafter referred to as "compound (a)") is not particularly limited, and is typically used: p-and m-diisopropenylbenzene, p-and M-bis(α-hydroxyisopropyl)benzene, 1-(α-hydroxyisopropyl)-3-isopropenylbenzene, 1-(α-hydroxyisopropyl)-4-isopropenylbenzene or this And other mixtures. In addition, nuclear alkyl substituents of these compounds can also be used, such as diisopropenyltoluene and bis(α-hydroxyisopropyl)toluene, etc., and nuclear halogen substituents can also be used, such as: chlorodi Isopropenylbenzene and chlorobis(α-hydroxyisopropyl)benzene, etc.

In addition, as the aforementioned compound (a), for example, 2-chloro-1,4-diisopropenylbenzene, 2-chloro-1,4-bis(α-hydroxyisopropyl)benzene, 2 -Bromo-1,4-diisopropenylbenzene, 2-bromo-1,4-bis(α-hydroxyisopropyl)benzene, 2-bromo-1,3-diisopropenylbenzene, 2-bromo- 1,3-bis(α-hydroxyisopropyl)benzene, 4-bromo-1,3-diisopropylbenzene, 4-bromo-1,3-bis(α-hydroxyisopropyl)benzene, 5- Bromo-1,3-diisopropenylbenzene, 5-bromo-1,3-bis(α-hydroxyisopropyl)benzene, 2-methoxy-1,4-diisopropenylbenzene, 2-methyl Oxy-1,4-bis(α-hydroxyisopropyl)benzene, 5-ethoxy-1,3-diisopropenylbenzene, 5-ethoxy-1,3-bis(α-hydroxyisopropyl) Propyl)benzene, 2-phenoxy-1,4-diisopropenylbenzene, 2-phenoxy-1,4-bis(α-hydroxyisopropyl)benzene, 2,4-diisopropenyl Benzenethiol, 2,4-bis(α-hydroxyisopropyl)benzenethiol, 2,5-diisopropenylbenzenethiol, 2,5-bis(α-hydroxyisopropyl)benzenethiol, 2-Methylthio-1,4-diisopropenylbenzene, 2-methylthio-1,4-bis(α-hydroxyisopropyl)benzene, 2-phenylthio-1,3-diisopropene Benzene, 2-phenylthio-1,3-bis(α-hydroxyisopropyl)benzene, 2-phenyl-1,4-diisopropenylbenzene, 2-phenyl-1,4-bis( α-hydroxyisopropyl)benzene, 2-cyclopentyl-1,4-diisopropenylbenzene, 2-cyclopentyl-1,4-bis(α-hydroxyisopropyl)benzene, 5-naphthyl -1,3-Diisopropenylbenzene, 5-naphthyl-1,3-bis(α-hydroxyisopropyl)benzene, 2-methyl-1,4-diisopropenylbenzene, 2-methyl -1,4-bis(α-hydroxyisopropyl)benzene, 5-butyl-1,3-diisopropenylbenzene, 5-butyl-1,3-bis(α-hydroxyisopropyl)benzene , 5-cyclohexyl-1,3-diisopropenylbenzene, 5-cyclohexyl-1,3-bis(α-hydroxyisopropyl)benzene, etc.

In addition, the substituent contained in the aforementioned compound (a) is not particularly limited, and the above-exemplified compounds can be used. However, in the case of a substituent with a large steric obstacle, it is less likely to occur than a substituent with a small steric obstacle. The resulting stacking of maleimines makes it difficult to crystallize between maleimines. In other words, the solvent solubility of maleimines is improved and becomes an ideal state.

In addition, as the compound represented by the above general formula (5) (hereinafter referred to as "compound (b)"), in addition to aniline, for example, dimethylaniline, diethylaniline, and diisopropylaniline can be used. , Ethylmethylaniline, chloroaniline, dichloroaniline, toluidine, xylene amine, phenylaniline, nitroaniline, aminophenol and cyclohexylaniline, etc. In addition, methoxyaniline, ethoxyaniline, phenoxyaniline, naphthoxyaniline, aminothiol, methylthioaniline, ethylthioaniline, and thiophenylaniline can be exemplified.

In addition, when the maleimide group is directly bonded to the benzene ring as in the conventional maleimide (for example, N-phenylmaleimide), the benzene ring and the five members of the maleimide The state of the rings arranged on the same plane is stable, so it becomes easy to stack and exhibits high crystallinity. Therefore, it becomes a cause of poor solvent solubility. In contrast, in the case of the present invention, as the aforementioned compound (b), there is no particular limitation, except that the above-exemplified compounds can be used. For example, when 2,6-dimethylaniline has a methyl group as a substituent, The benzene ring and the five-membered ring of maleimide adopt a distorted configuration due to the steric barrier of the methyl group and become difficult to stack. Therefore, the crystallinity is reduced and the solvent solubility is improved, which becomes an ideal state. However, if the steric barrier is too large, the reactivity may be hindered during the synthesis of maleimide. Therefore, for example, it is preferable to use a compound (b) having an alkyl group having 2 to 4 carbon atoms.

In the method for producing the intermediate amine compound represented by the general formula (6) used in the present invention, the compound (a) and the compound (b) are compared to the compound (b) of the compound (a) The molar ratio (compound (b)/compound (a)) is preferably 0.1 to 2.0, more preferably 0.2 to 1.0. After adding and reacting (the first stage), the aforementioned compound (b) is then compared to The molar ratio of the aforementioned compound (a) added previously is preferably 0.5-20.0, and more preferably 0.7-5.0. It is further added in an amount to react (the second stage), thereby obtaining an indene The maleimide of the skeleton (A). In addition, this two-stage reaction also provides an ideal result from the viewpoint of completion of the reaction, operability, and the like. In addition, in the reaction of the first stage, the molar ratio (compound (b)/compound (a)) of the previously added compound (a) is better by setting the aforementioned compound (b) 0.10 to 0.49, more preferably 0.15 to 0.40, still more preferably 0.20 to 0.39. Since it has a wide molecular weight distribution, the content of low-molecular-weight, high-melting-point substances becomes low, and the ratio of high-molecular-weight components becomes high. It is preferable to obtain intermediate amine compounds and maleimines which are excellent in solvent solubility and can contribute to flexibility and brittleness resistance.

The acid catalyst used in the aforementioned reaction includes, for example, inorganic acids such as phosphoric acid, hydrochloric acid, and sulfuric acid, organic acids such as oxalic acid, benzenesulfonic acid, toluenesulfonic acid, methanesulfonic acid, and fluoromethanesulfonic acid, such as activated clay, acid Clay, alumina, zeolite, solid acid like strong acid ion exchange resin, heteropoly acid salt, etc. From the point of view of operability, the solid acid that can easily remove the catalyst by filtration after the reaction is also used. Preferably, when other acids are used, it is preferable to perform neutralization with alkali and washing with water after the reaction.

The blending amount of the aforementioned acid catalyst is based on 100 parts by mass of the total amount of the aforementioned compound (a) and the aforementioned compound (b) of the initially charged raw materials, and the acid catalyst is blended in the range of 5-40 parts by mass, From the viewpoint of operability and economic efficiency, it is preferably 5 to 30 parts by mass. The reaction temperature may generally be in the range of 100 to 300°C, and in order to suppress the formation of the isomer structure and avoid side reactions such as thermal decomposition, it is preferably 150 to 230°C.

As for the reaction time, from the viewpoint that the reaction cannot proceed completely in a short time, and if it is set for a long time, it will cause side reactions such as thermal decomposition reaction of the product. Under the above reaction temperature condition, it is usually in the range of 2 to 48 hours in total. , And preferably a total of 2-24 hours, more preferably a total of 4-24 hours, still more preferably a total of 4-12 hours, in order to reduce low-molecular-weight components and increase high-molecular-weight components, a total of 8-12 hours For better.

In the aforementioned method for producing an intermediate amine compound, since aniline or a derivative thereof can also serve as a solvent, other solvents may not necessarily be used, and a solvent may be used. For example, in the case of a reaction system that also has a dehydration reaction, specifically, a compound having an α-hydroxypropyl group is used as a raw material to react. It can be azeotropically dehydrated by using toluene, xylene, or chlorobenzene. After the dehydration reaction is completed, the solvent is distilled off, and the reaction is carried out within the above-mentioned reaction temperature range.

The maleimide (A) used in the present invention can be obtained by putting the intermediate amine compound represented by the above general formula (6) obtained by the above method into a reactor and dissolving it in a suitable solvent. It is obtained by reacting in the presence of an acid anhydride and a catalyst, after the reaction, by removing unreacted maleic anhydride and other impurities by washing with water, and by removing the solvent under reduced pressure. In addition, a dehydrating agent can be used during the reaction.

The maleimide (A) used in the present invention has the skeleton of the general formula (1) and includes the structure represented by the general formula (7) having a dihydroindene skeleton, and when q is 3 or less and the amine When at least two of the ortho and para positions of the group are hydrogen atoms, the structure corresponding to the above general formula (8), that is, the structure represented by the following general formula (9) is also included as the above general formula (1) Represents the structure.

上述通式(9)中的Ra、Rb、q、r及m表示與上述相同者。

Ra, Rb, q, r, and m in the above general formula (9) represent the same as the above.

As the organic solvent used in the maleimidization reaction for synthesizing the aforementioned maleimines (A), acetone, methyl ethyl ketone (MEK), methyl isobutyl ketone, and cyclohexyl ketone can be mentioned. Ketones such as ketones and acetophenones, N,N-dimethylformamide, N,N-dimethylacetamide, dimethyl sulfide, N-methyl-2-pyrrolidone, acetonitrile, Cyclobutane and other aprotic solvents, dioxane, tetrahydrofuran and other cyclic ethers, ethyl acetate, butyl acetate and other esters, benzene, toluene, xylene and other aromatic solvents, etc., and these can be separate It can also be used in combination.

In the aforementioned maleic imidization reaction, the aforementioned intermediate amine compound and maleic anhydride are blended in a range of 1 to 1.5 in an equivalent ratio of maleic anhydride to the equivalent of the amine group of the intermediate amine compound. Preferably, it is more preferably introduced in 1.1-1.2 to be in an organic solvent having a mass ratio of 0.5-50, preferably a mass ratio of 1 to 5 with respect to the total amount of the intermediate amine compound and maleic anhydride Make it react in a better state.

Examples of the catalyst used in the aforementioned imidization reaction of maleic acid include: nickel, cobalt, sodium, calcium, iron, lithium, manganese and other inorganic salts such as acetate, chloride, bromide, sulfate, and nitrate, Inorganic acids such as phosphoric acid, hydrochloric acid, sulfuric acid, oxalic acid, benzenesulfonic acid, toluenesulfonic acid, methanesulfonic acid, fluoromethanesulfonic acid and other organic acids, such as activated clay, acid clay, silica alumina, zeolite, strong acid ion exchange resin General solid acids, heteropoly acid salts, etc., and especially toluenesulfonic acid can be ideally used.

Examples of the dehydrating agent used in the maleic imidization reaction include: lower aliphatic carboxylic acid anhydrides such as acetic anhydride, propionic anhydride, and butyric anhydride, oxides such as phosphorus pentoxide, calcium oxide, and barium oxide, sulfuric acid, etc. Porous ceramics such as inorganic acids and molecular sieves, etc., and acetic anhydride is preferably used.

The amount of catalyst and dehydrating agent used in the aforementioned maleic imidization reaction is not particularly limited. It is usually 1 equivalent relative to the amine group of the intermediate amine compound. The catalyst can be 0.0001 to 1.0 mol, which is more It is preferably 0.001 to 0.5 mol, more preferably 0.01 to 0.3 mol, and the dehydrating agent can be used at 1 to 3 mol, preferably 1 to 1.5 mol.

As the reaction conditions for the aforementioned maleimidization, the above-mentioned intermediate amine compound and maleic anhydride can be charged and reacted at a temperature range of 10-100°C (preferably 30-50°C) for 0.5-12 hours (Preferably 1-8 hours), add the aforementioned catalyst, and react at a temperature range of 90-130°C (preferably 105-120°C) for 2-24 hours (preferably 4-10 hours) In order to reduce low-molecular-weight components and increase high-molecular-weight components, it is better to take 6-10 hours. In addition, after the reaction, unreacted maleic anhydride and other impurities are removed by washing with water, and low-molecular-weight components are reduced and high-molecular-weight components are increased by heat aging.

From the viewpoint of excellent low dielectric constant and low dielectric loss tangent, the aforementioned maleimide (A) is based on the molecular weight distribution (weight average molecular weight (Mw) calculated from the gel permeation chromatography (GPC) measurement). )/Number average molecular weight (Mn)) is preferably in the range of 1.0 to 10.0, more preferably 1.1 to 9.0, still more preferably 1.1 to 8.0, still more preferably 1.2 to 5.0, still more preferably 1.2 to 4.0, It is more preferably 1.3 to 3.8, particularly preferably 1.3 to 3.6, and most preferably 1.3 to 3.4. In addition, from the GPC chart obtained from the aforementioned GPC measurement, when the molecular weight distribution is over a wide range and there are many high molecular weight components, the proportion of high molecular weight components that contribute to flexibility increases. The hardened product of Leximine can obtain a hardened product with excellent flexibility and softness due to its suppression of brittleness, which is an ideal aspect.

＜GPC measurement＞ The molecular weight distribution (Mw/Mn) of maleimide (A) was measured based on gel permeation chromatography (GPC) under the following conditions. Measuring device: "HLC-8320 GPC" manufactured by Tosoh Co., Ltd. Column: Protection column "HXL-L" made by Tosoh Co., Ltd. + "TSK-GEL G2000HXL" made by Tosoh Co., Ltd. + "TSK-GEL G2000HXL" made by Tosoh Co., Ltd. + "TSK-GEL G3000HXL" made by Tosoh Co., Ltd. + Tosoh Co., Ltd. "TSK-GEL G4000HXL" Detector: RI (differential refractometer) Data processing: "GPC Workstation EcoSEC-WorkStation" manufactured by Tosoh Co., Ltd. Measurement conditions: column temperature 　40℃ Developing solvent　tetrahydrofuran Flow rate　1.0ml/min Standard: According to the measurement manual of the aforementioned "GPC Workstation EcoSEC-WorkStation", the following known monodisperse polystyrene is used for molecular weight. (Used polystyrene) "A-500" manufactured by Tosoh Co., Ltd. "A-1000" manufactured by Tosoh Co., Ltd. "A-2500" manufactured by Tosoh Co., Ltd. "A-5000" manufactured by Tosoh Co., Ltd. "F-1" manufactured by Tosoh Co., Ltd. "F-2" manufactured by Tosoh Co., Ltd. "F-4" manufactured by Tosoh Co., Ltd. "F-10" manufactured by Tosoh Co., Ltd. "F-20" manufactured by Tosoh Co., Ltd. "F-40" manufactured by Tosoh Co., Ltd. "F-80" manufactured by Tosoh Co., Ltd. "F-128" manufactured by Tosoh Co., Ltd. Sample: The resin solid content of maleimide obtained in the synthesis example was converted into 1.0% by mass of a tetrahydrofuran solution filtered with a microfilter (50 μl).

＜Cyanate ester compound (B)＞ The curable resin composition of the present invention is characterized by containing a cyanate ester compound (B) in addition to the maleimide (A) having a dihydroindene skeleton. The aforementioned cyanate ester compound (B) has excellent dielectric properties such as dielectric constant and dielectric loss tangent. Therefore, even in the high frequency band (high frequency range) from the MHz band to the GHz band, it can be prepared and maintained sufficiently low. It is a curable resin composition of a cured product that exhibits a sufficiently low dielectric loss tangent at the same time as the dielectric constant, so it can be used as a high-frequency molding material and is useful. In addition, by reacting with the aforementioned maleimide (A) having a dihydroindene skeleton, it functions as a hardening agent to produce three-dimensional cross-linking, and can obtain heat resistance, low thermal expansion, adhesion, and further Hardened products with excellent mechanical properties and chemical resistance are ideal.

Examples of the cyanate ester compound (B) include bisphenol A type cyanate ester resin, bisphenol F type cyanate ester resin, bisphenol E type cyanate ester resin, bisphenol S type cyanate ester resin, Bisphenol sulfide type cyanate ester resin, phenyl ether type cyanate ester resin, naphthyl ether type cyanate ester resin, biphenyl type cyanate ester resin, tetramethyl biphenyl type cyanate ester resin, polyhydroxynaphthalene type cyanide Ester resin, phenol novolak type cyanate ester resin, cresol novolak type cyanate ester resin, triphenylmethane type cyanate ester resin, tetraphenylethane type cyanate ester resin, dicyclopentadiene-phenol Addition reaction type cyanate ester resin, phenol aralkyl type cyanate ester resin, naphthol novolak type cyanate ester resin, naphthol aralkyl type cyanate ester resin, naphthol-phenol cocondensed novolak type cyanide Acid ester resin, naphthol-cresol co-condensed novolac type cyanate ester resin, aromatic hydrocarbon formaldehyde resin modified phenol resin type cyanate ester resin, biphenyl modified novolac type cyanate ester resin, anthracene type cyanic acid Ester resin etc. These may be used individually, respectively, and may use 2 or more types together.

In particular, from the viewpoint of obtaining a cured product with excellent heat resistance, among the above-mentioned cyanate ester compounds (cyanate ester resin), bisphenol A type cyanate ester resin, bisphenol F type cyanate ester resin, and bisphenol F cyanate ester resin are used. Phenol E type cyanate resin, polyhydroxynaphthalene type cyanate resin, naphthyl ether type cyanate resin, and novolak type cyanate resin are preferred, from the viewpoint of obtaining a cured product with excellent dielectric properties , Is preferably dicyclopentadiene-phenol addition reaction type cyanate ester resin.

In the curable resin composition of the present invention, a curing agent other than the cyanate ester compound (B) may be added in a range that does not impair the curing of the present invention. In addition, the cyanate ester compound (B) is preferably 50% by mass or more, more preferably 60% by mass or more, more preferably 70% by mass or more, and 80% by mass relative to 100% by mass of the total amount of the curing agent. The above is particularly good, and 90% by mass or more is the best.

Examples of curing agents other than the aforementioned cyanate ester compound (B) include: amine compounds, amide compounds, acid anhydride compounds, phenol compounds, polyphenylene ether compounds, and substituents containing unsaturated double bonds. Compounds, diene polymers, etc. These curing agents may be used alone or in combination of two or more types.

Examples of the aforementioned amine compounds include: diaminodiphenylmethane, diethylenetriamine, ethylenetetramine, diaminodiphenyl sulfonium, isophorone diamine, imidazole, and BF ₃ -amine zirconium. Compounds, guanidine derivatives, etc.

Examples of the aforementioned amide-based compound include dicyandiamine, polyamide resin synthesized from a dimer of threonoleic acid and ethylenediamine, and the like.

Examples of the acid anhydride compound include: phthalic anhydride, trimellitic anhydride, pyromellitic anhydride, maleic anhydride, tetrahydrophthalic anhydride, methyltetrahydrophthalic anhydride, methylnadic anhydride, hexahydrophthalic anhydride, and methylhexahydrophthalic anhydride. Hydrogen phthalic anhydride, etc.

Examples of the phenol-based compound include: phenol novolak resin, cresol novolak resin, aromatic hydrocarbon formaldehyde resin modified phenol resin, dicyclopentadiene phenol addition molding resin, phenol aralkyl resin (Xylok resin) , Resorcinol novolak resin is represented by polyvalent phenol novolak resin synthesized with formaldehyde and polyvalent phenol novolak resin, naphthol aralkyl resin, trimethylol methane resin, tetrahydroxyphenyl ethane resin, naphthalene Phenol novolac resin, naphthol-phenol co-condensation novolak resin, naphthol-cresol co-condensation novolak resin, biphenyl modified phenol resin (multivalent phenol compound with phenol core connected with bismethylene group), biphenyl Modified naphthol resin (polyvalent naphthol compound connected with phenol nucleus with bismethylene), modified phenol resin (multivalent phenol compound connected with phenol nucleus such as melamine, benzoguanamine, etc.), containing Alkoxy aromatic ring is used to modify novolac resin (polyvalent phenol compound connecting phenol nucleus and aromatic ring containing alkoxy group with formaldehyde) and other polyvalent phenol compounds.

As the aforementioned polyphenylene ether compound, for example, it has a structure represented by the following general formula (10) or (11).

The Rd in the above general formulas (10) and (11) can each independently enumerate: hydrogen atom, alkyl group with 1 to 5 carbons, alkenyl group with 1 to 5 carbons, cycloalkyl with 3 to 5 carbons, carbon Alkoxy groups with 1 to 5 carbons, thioether groups with 1 to 5 carbons, alkylcarbonyl groups with 2 to 5 carbons, alkoxycarbonyl groups with 2 to 5 carbons, alkoxycarbonyl groups with 2 to 5 carbons, carbon Alkylsulfonyl groups of 1 to 5, etc. As the terminal structure of the structure of the said general formula (10) and (11), the group which has a hydroxyl group or a reactive double bond, etc. are mentioned. In addition, s is an integer value of 1-30, and t and u are also integer values of 1-30.

The alkyl group having 1 to 5 carbon atoms is not particularly limited, and examples include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, secondary butyl, tertiary butyl, Propyl and so on.

The alkenyl group having 1 to 5 carbon atoms is not particularly limited, and examples thereof include vinyl, 1-propenyl, 1-butenyl, 1-pentenyl, isopropenyl, and the like.

The cycloalkyl group having 3 to 5 carbon atoms is not particularly limited, and examples thereof include cyclopropyl, cyclobutyl, cyclopentyl, and methylcyclobutyl.

The alkoxy group having 1 to 5 carbon atoms is not particularly limited, and examples thereof include a methoxy group, an ethoxy group, a propoxy group, an isopropoxy group, a butoxy group, and a pentoxy group.

The thioether group having 1 to 5 carbon atoms is not particularly limited, and examples thereof include methylthio, ethylthio, propylthio, isopropylthio, butylthio, pentylthio, and the like.

The alkylcarbonyl group having 2 to 5 carbon atoms is not particularly limited, and examples thereof include methylcarbonyl, ethylcarbonyl, propionyl, isopropylcarbonyl, and butyrylcarbonyl.

The alkoxycarbonyl group having 2 to 5 carbon atoms is not particularly limited, and examples include methoxycarbonyl, ethoxycarbonyl, propoxycarbonyl, isopropoxycarbonyl, butoxycarbonyl, and the like.

The alkoxy group having 2 to 5 carbon atoms is not particularly limited, but exemplified are methylcarbonyloxy, ethcarbonyloxy, propcarbonyloxy, isopropylcarbonyloxy, butcarbonyloxy, and the like.

The alkanesulfonyl group having 1 to 5 carbon atoms is not particularly limited, but examples include methanesulfonyl, ethanesulfonyl, propanesulfonyl, isopropylsulfonyl, butanesulfonyl, and pentanyl Li Ji et al.

Among these, the aforementioned Rd is preferably a hydrogen atom, an alkyl group having 1 to 5 carbons, or a cycloalkyl group having 3 to 5 carbons, and more preferably a hydrogen atom and an alkyl group having 1 to 5 carbons, and hydrogen An atom, a methyl group, and an ethyl group are more preferable, and a hydrogen atom and a methyl group are particularly preferable.

Examples of Y in (11) above include divalent aromatic groups derived from aromatic compounds having two phenolic hydroxyl groups.

The aromatic compound having two phenolic hydroxyl groups is not particularly limited, and examples include catechol, resorcinol, hydroquinone, 1,4-dihydroxynaphthalene, and 1,5-dihydroxynaphthalene , 2,6-dihydroxynaphthalene, 2,7-dihydroxynaphthalene, 4,4'-biphenol, bisphenol A, bisphenol B, bisphenol BP, bisphenol C, bisphenol F, tetramethyl bisphenol A etc. Among these, hydroquinone, 2,6-dihydroxynaphthalene, 2,7-dihydroxynaphthalene, 4,4'-biphenol, bisphenol A, bisphenol E, and bisphenol F are preferred. , 4'-biphenol, bisphenol A, tetramethyl bisphenol A are more preferable.

The two phenolic hydroxyl groups of the above-mentioned aromatic compound having two phenolic hydroxyl groups form a phenyl ether bond (two oxygen atoms bonded to Y), so Y is derived from an aromatic having two phenolic hydroxyl groups The divalent aromatic group of the compound.

As the aforementioned compound having a substituent containing an unsaturated double bond, for example, as long as it is a compound having two or more unsaturated bond-containing substituents in the molecule, it is not particularly limited, and examples include allyl groups and isopropenyl groups. , 1-propenyl, acryloyl, methacryloyl, styryl, styrylmethyl, etc. as the aforementioned compounds containing unsaturated bond substituents.

Examples of the diene polymer include non-modified diene polymers that are not modified by polar groups. Here, the polar group refers to a functional group that affects dielectric properties, and examples thereof include a phenol group, an amino group, and an epoxy group. The diene polymer is not particularly limited, and for example, 1,2-polybutadiene, 1,4-polybutadiene, etc. can be used.

As the aforementioned diene polymer, it is also possible to use homopolymers and derivatives of butadiene in which 50% or more of the butadiene units in the polymer chain are 1,2-bonds.

In the curable resin composition of the present invention, a curing accelerator may be appropriately used in combination as needed. As the hardening accelerator, various can be used, and since the cyanate ester compound (B) is used, for example, phenols, amines, Lewis acids, tertiary sulfonium salts, quaternary ammonium salts, and quaternary phosphonium salts can be mentioned. , Compounds containing epoxy groups, etc. Among these can also be used: nonphenol, 2,4,6-ginseng (dimethylaminomethyl) phenol, copper, lead, tin, manganese, nickel, iron, zinc, cobalt and other carboxylates, Tetra-n-butoxy titanium and its polymers, copper, nickel, cobalt and other pentanedionate salts, tetrabutylammonium bromide, tetrabutylphosphonium chloride, tetraphenylphosphonium tetra(methylphenyl) borate, caprylic acid Zinc and so on. In addition, the curing accelerator is preferably compatible with the cyanate ester compound (B) so that the curing reaction proceeds smoothly. Furthermore, among these, tetraphenylphosphonium tetra(methylphenyl) borate is particularly preferred. It is better to use tetraphenylphosphonium tetra(methylphenyl) borate as the aforementioned hardening accelerator, because the hardening reaction proceeds faster than others. Moreover, the addition amount of the said hardening accelerator is preferably 0.001-1.00 mass parts with respect to 100 mass parts of the said cyanate ester compound (B), for example.

＜Preparation of curable resin composition＞ The curable resin composition of the present invention is characterized by containing maleimide (A) having a dihydroindene skeleton (hereinafter sometimes referred to as "(A) component") and a cyanate ester compound (B) (hereinafter Sometimes called "(B) component"). As the aforementioned (B) component, a three-dimensional cross-linking can occur by the reaction with the aforementioned (A) component, and a cured product having excellent dielectric properties and heat resistance can be obtained, which is an ideal aspect.

The blending ratio (parts by mass) of the aforementioned (A) component and the aforementioned (B) component is preferably 90:10-10:90 for (A) component: (B) component, and more preferably 80: 20-20:80, more preferably 75:25-25:75. By setting the blending ratio in the aforementioned range, heat resistance, low dielectric constant, and low dielectric loss tangent are excellent, and flexibility can be expressed, which is preferable.

The curable resin composition of the present invention can also be added with compounds containing alkenyl groups, such as bismaleimines and allyl ethers other than the aforementioned maleimines (A), within the scope that does not impair the purpose. Based compounds, allylamine based compounds, triallyl cyanurate, alkenylphenol based compounds, vinyl-containing polyolefin compounds, etc. In addition, other thermosetting resins, such as thermosetting polyimide resins, epoxy resins, phenol resins, active ester resins, benzoic resins, cyanate resins, etc., can also be appropriately blended according to the purpose.

The curable resin composition of the present invention may incorporate a non-halogen flame retardant that does not substantially contain a halogen atom in order to exhibit flame retardancy within a range that does not impair its purpose. Examples of the aforementioned non-halogen flame retardants include: phosphorus flame retardants, nitrogen flame retardants, silicone flame retardants, inorganic flame retardants, organic metal salt flame retardants, etc. Can be used alone or in combination.

The curable resin composition of the present invention can be blended with inorganic fillers as needed. Examples of the aforementioned inorganic filler include fused silica, crystalline silica, alumina, silicon nitride, aluminum hydroxide, and the like. When the blending amount of the aforementioned inorganic filler is set to be particularly large, it is preferable to use fused silica. The aforementioned molten silica can be used even if it is broken or spherical. In order to increase the blending amount of molten silica and suppress the increase in the melt viscosity of the molding material, it is better to use the spherical shape. good. Furthermore, in order to increase the blending amount of the spherical silica, it is better to appropriately adjust the particle size distribution of the spherical silica. The filling rate considers flame retardancy, and the higher one is preferable, and it is particularly preferable to be 20% by mass or more with respect to the total amount of the curable resin composition. In addition, when the aforementioned curable resin composition is used for applications such as conductive paste described in detail below, conductive fillers such as silver powder and copper powder can be used.

In the curable resin composition of the present invention, various blending agents such as silane coupling agents, mold release agents, pigments, emulsifiers and the like can be added as needed.

＜Hardened material＞ The cured product of the present invention is preferably such that the aforementioned curable resin composition undergoes a curing reaction. The aforementioned curable resin composition can be obtained by uniformly mixing the above-mentioned components, and can be easily formed into a cured product by the same method as a conventionally known method. Examples of the above-mentioned cured products include molded products such as laminates, cast products, adhesive layers, coating films, and films.

As the aforementioned hardening (thermal hardening) reaction, although it can be easily carried out without a catalyst, when it is desired to make the reaction faster, a polymerization initiator such as an organic peroxide or an azo compound, such as a phosphine compound is added. , Tertiary amine-like alkaline catalyst is effective. For example, there are: benzyl peroxide, dicumyl peroxide, azobisisobutyronitrile, triphenylphosphine, triethylamine, imidazoles, etc. The blending amount is based on the entire curable resin composition It is preferably 0.05 to 5% by mass.

＜Prepreg＞ The prepreg of the present invention is preferably a semi-cured product having a reinforcing base material and the aforementioned curable resin composition impregnated in the aforementioned reinforcing base material. As a method for preparing the aforementioned prepreg, a well-known method can be used, and the prepreg can be prepared by impregnating a reinforcing base material with a resin varnish in which the aforementioned curable resin composition is dissolved (diluted) in an organic solvent, and The reinforcing substrate impregnated with the resin varnish is heat-treated, thereby semi-curing (or uncuring) the curable resin composition.

As the aforementioned organic solvent, for example, toluene, xylene, N,N-dimethylformamide, N,N-dimethylacetamide, N-methyl-2-pyrrolidone, methylethyl Among ketones (MEK), methyl isobutyl ketone, dioxane, tetrahydrofuran, etc., they are used alone or as a mixed solvent of two or more kinds.

As a reinforcing substrate impregnated with the aforementioned resin varnish, woven fabrics, non-woven fabrics, mats, papers, etc. composed of inorganic fibers such as glass fiber, polyester fiber, polyamide fiber, etc., or organic fibers, which can be singly or combined use.

The mass ratio of the curable resin composition to the reinforcing substrate in the aforementioned prepreg is not particularly limited, but the curable resin composition (the resin component in the prepreg) is usually 20-60% by mass. The method of preparation is better.

As the heat treatment conditions of the aforementioned prepreg, it can be appropriately selected according to the organic solvents, catalysts, the types of additives used, the amount of use, etc., and usually at a temperature of 80 to 220 ℃, 3 minutes to 30 minutes. get on.

＜Heat-resistant materials and electronic materials＞ The cured product obtained from the curable resin composition of the present invention is excellent in heat resistance and dielectric properties, and therefore can be ideally used for heat-resistant components and electronic components. In particular, it can be ideally used in: circuit boards, semiconductor packaging materials, semiconductor devices, build-up films, build-up substrates, adhesives, photoresist materials, etc. In addition, it can also be ideally used for matrix resins of fiber-reinforced resins, and is particularly suitable as a prepreg with high heat resistance. In addition, the maleimide (A) having a dihydroindene skeleton contained in the curable resin composition can be coated because it exhibits excellent solubility in various solvents. The heat-resistant components and electronic components obtained in this way can be ideally used for various purposes. Examples include: industrial machinery parts, general machinery parts, automobile, railway, and vehicle parts, space and aviation related parts, electronic and electrical parts, and construction materials. , Containers, packaging components, daily necessities, sports and leisure goods, wind power generation shell components, etc., but not limited to these.

Hereinafter, examples of representative products manufactured using the curable resin composition of the present invention will be described.

＜Circuit board＞ In the present invention, as the circuit board, it is preferable to laminate the aforementioned prepreg and copper foil, and perform heat compression bonding and molding. Specifically, as a method of obtaining a circuit board from the curable resin composition of the present invention, there can be mentioned: stacking the above-mentioned prepreg by a conventional method, appropriately superimposing copper foil, and pressing at 170 It is a method of heating and pressing for 10 minutes to 3 hours at ~300°C.

＜Semiconductor packaging materials＞ In the present invention, as a semiconductor encapsulating material, it is preferable to contain the aforementioned curable resin composition. Specifically, as a method of obtaining a semiconductor encapsulating material from the curable resin composition of the present invention, there may be mentioned: using an extruder, kneader, roller, etc., as needed, and combining the curable resin composition with further It is a method to fully melt and mix the admixtures such as optional hardening accelerators and inorganic fillers until they become uniform. At this time, as an inorganic filler, fused silica is usually used, and when used as a high thermal conductivity semiconductor packaging material for power transistors and power ICs, crystalline silica with a higher thermal conductivity than fused silica is used. , Alumina, silicon nitride and other high filling, or fused silica, crystalline silica, alumina, silicon nitride, etc. are preferred. The filling rate is to use an inorganic filler in the range of 30 to 95 parts by mass per 100 parts by mass of the curable resin composition, in order to improve flame retardancy, moisture resistance, resistance to welding cracks, and reduce linear expansion. The coefficient is more preferably 70 parts by mass or more, and more preferably 80 parts by mass or more.

＜Semiconductor device＞ In the present invention, as the semiconductor device, it is preferable to include a cured product obtained by heat-curing the aforementioned semiconductor packaging material. Specifically, as a semiconductor package molding for obtaining a semiconductor device from the curable resin composition of the present invention, there may be mentioned: molding the above-mentioned semiconductor package material using an injection or transfer molding machine, an injection molding machine, etc., and further in the range of 50 to 250 ℃, the method of heating and hardening between 2-10 hours.

＜Build-up substrate＞ As a method of obtaining a build-up substrate from the curable resin composition of the present invention, a method through steps 1 to 3 can be cited. In step 1, first, the curable resin composition appropriately blended with rubber, filler, etc., is applied to the circuit board on which the circuit is formed using a spray coating method, a curtain coating method, etc., and then cured. In step 2, the circuit board coated with the curable resin composition is drilled into predetermined through holes, etc., and then treated with a roughening agent, and the surface is cleaned by hot water. , The aforementioned substrate is formed with concavities and convexities, and metal such as copper is plated. In step 3, the operations of steps 1 to 2 are sequentially repeated as required to alternately build up the resin insulating layer and the conductor layer of the predetermined circuit pattern to form the build-up substrate. In addition, in the foregoing steps, the drilling of the through-hole portion is preferably performed after the resin insulating layer of the outermost layer is formed. In addition, the build-up substrate of the present invention can also be formed by heating and compressing a copper foil with resin in which the resin composition is semi-cured on a copper foil at 170 to 300°C on a circuit-formed wiring board. The roughened surface is formed, the plating process is omitted, and the build-up substrate is produced.

＜Build-up film＞ The build-up film of the present invention preferably contains the aforementioned curable resin composition. As a method of obtaining a build-up film from the curable resin composition of the present invention, for example, a method of coating the curable resin composition on a support film and then drying it to form a resin composition layer on the support film method. When the curable resin composition of the present invention is used in a build-up film, the most important thing for the film is to show that the film softens under the temperature conditions of the lamination in the vacuum lamination method (usually 70°C to 140°C), While the circuit board is laminated, the resin existing in the through holes or through holes of the circuit board is filled with possible fluidity (resin flow), and it is preferable to blend the aforementioned components in a manner that exhibits such characteristics. In addition, in order to avoid the phenomenon of showing locally different characteristic values due to phase separation etc. in the resulting build-up film and circuit board (copper-clad laminate, etc.), a certain performance can be exhibited in any part, and The uniformity of appearance is required.

Here, the diameter of the through hole of the circuit board is usually 0.1-0.5 mm, and the depth is usually 0.1-1.2 mm. Usually, it is better to make resin filling possible within this range. In addition, in the case of laminating both sides of the circuit board, it is desirable to fill about 1/2 of the through hole.

As a specific method of manufacturing the aforementioned build-up film, it can be enumerated: after preparing a resin composition blended with an organic solvent to be varnished, then coating the aforementioned varnished resin composition on the surface of the support film (Y), and further A method of drying the organic solvent by heating or blowing with hot air to form the resin composition layer (X).

As the organic solvent used here, for example, ketones such as acetone, methyl ethyl ketone, cyclohexanone, ethyl acetate, butyl acetate, serosol acetate, propylene glycol monomethyl ether acetate, carbamide are used. Acetate esters such as alcohol acetate, carbitols such as Celosine and butyl carbitol, aromatic hydrocarbons such as toluene and xylene, dimethylformamide, dimethylacetamide, N- Methylpyrrolidone etc. are preferable, and it is preferable to use it in the ratio of 30-60 mass% of non-volatile components.

In addition, the thickness of the resin composition layer (X) to be formed usually needs to be greater than the thickness of the conductor layer. The thickness of the conductor layer of the circuit board is usually in the range of 5 to 70 μm. Therefore, the thickness of the aforementioned resin composition layer (X) is preferably 10 to 100 μm. In addition, the aforementioned resin composition layer (X) in the present invention can be protected by a protective film described later. By protecting it with a protective film, it is possible to prevent the adhesion and damage of waste, etc., to the surface of the resin composition layer.

The aforementioned support film and protective film include: polyethylene, polypropylene, polyolefin such as polyvinyl chloride, polyester such as polyethylene terephthalate (PET), polyethylene naphthalate, polycarbonate, Polyimide further includes metal foils such as release paper, copper foil, and aluminum foil. In addition, the support film and the protective film can be subjected to a mold release treatment in addition to the matting treatment and corona treatment. The thickness of the support film is not particularly limited, but it is usually 10 to 150 μm, and preferably used in the range of 25 to 50 μm. In addition, the thickness of the protective film is preferably 1 to 40 μm.

The aforementioned supporting film (Y) is peeled off after the circuit board is laminated or after the insulating layer is formed by heat curing. As long as the support film (Y) is peeled off after heating and curing the resin composition layer constituting the build-up film, the adhesion of wastes and the like in the curing step can be prevented. In the case of peeling after curing, the support film is usually pre-released.

In addition, a multilayer printed circuit board can be manufactured from the build-up film obtained as described above. For example, when a protective film is used to protect the resin composition layer (X), after peeling these off, the resin composition layer (X) is directly contacted with the circuit board, for example, by a vacuum lamination method. Layer on one or both sides of the circuit board. The lamination method can be a batch type or a continuous type using rollers. According to the needs, the build-up film and the circuit board can be heated (preheated) according to the needs before lamination. The lamination conditions are preferably set at 70～140℃ for the crimping temperature (laminating temperature) and 1～11kgf/cm ² (9.8×10 ⁴ ～107.9×10 ⁴ N/m ²⁾ ) Is preferable, and it is preferable to laminate under a reduced pressure of 20 mmHg (26.7 hPa) or less.

＜Conductive paste＞ As a method of obtaining a conductive paste from the curable resin composition of the present invention, for example, a method of dispersing conductive particles in the composition can be cited. The above-mentioned conductive paste can be made into a paste resin composition for circuit connection and an anisotropic conductive adhesive according to the type of conductive particles used. [Example]

Hereinafter, the present invention will be explained concretely with examples and comparative examples, but the following "parts" and "%" are quality standards unless otherwise specified. In addition, the softening point, amine equivalent, GPC, and FD-MS mass spectrometry were measured and evaluated under the following conditions.

1) Softening point Measuring method: According to JIS K7234 (Ring and Ball method), the softening point (°C) of the intermediate amine compound obtained in the synthesis example shown below is measured.

2) Amine equivalent The amine equivalent of the intermediate amine compound is determined by the following measurement method. In a 500mL Erlenmeyer flask with co-clamp, approximately 2.5g of the intermediate amine compound, 7.5g of pyridine, 2.5g of acetic anhydride, and 7.5g of triphenylphosphine of the sample were carefully weighed, and then the cooling tube was installed and the oil bath set at 120℃ Heat to reflux for 150 minutes. After cooling, add 5.0 mL of distilled water, 100 mL of propylene glycol monomethyl ether, and 75 mL of tetrahydrofuran, and titrate by potentiometric titration with a 0.5 mol/L potassium hydroxide-ethanol solution. Use the same method to perform a blank test and make corrections. Amine equivalent (g/eq.)=(S×2,000)/(Blank-A) S: The amount of sample (g) A: The consumption of 0.5mol/L potassium hydroxide-ethanol solution (mL) Blank: The consumption of 0.5mol/L potassium hydroxide-ethanol solution in the blank test (mL)

3) GPC determination The measurement was performed using the following measuring device and measurement conditions, and the GPC chart of the maleimide obtained in the synthesis example shown below (FIG. 1 to FIG. 9) was obtained. Measure and calculate the molecular weight distribution (weight average molecular weight (Mw)/number average molecular weight (Mn)) based on the results of the aforementioned GPC chart based on the number average molecular weight (Mn), and contribute to the dihydrogen in the maleimide The average number of repeating units of the indene skeleton "n". Specifically, for compounds with n=0 to 4, plot the theoretical molecular weight and the actual measured molecular weight in GPC on the scatter diagram to draw an approximate straight line, which is shown by the actual measured value Mn(1) on the straight line. Point to obtain the number average molecular weight (Mn), and calculate n. Measuring device: "HLC-8320 GPC" manufactured by Tosoh Co., Ltd. Column: Protection column "HXL-L" made by Tosoh Co., Ltd. + "TSK-GEL G2000HXL" made by Tosoh Co., Ltd. + "TSK-GEL G2000HXL" made by Tosoh Co., Ltd. + "TSK-GEL G3000HXL" made by Tosoh Co., Ltd. + Tosoh Co., Ltd. "TSK-GEL G4000HXL" Detector: RI (differential refractometer) Data processing: "GPC Workstation EcoSEC-WorkStation" manufactured by Tosoh Co., Ltd. Measurement conditions: column temperature 　40℃ Developing solvent　tetrahydrofuran Flow rate　1.0ml/min Standard: According to the measurement manual of the aforementioned "GPC Workstation EcoSEC-WorkStation", the following known monodisperse polystyrene is used for molecular weight. (Used polystyrene) "A-500" manufactured by Tosoh Co., Ltd. "A-1000" manufactured by Tosoh Co., Ltd. "A-2500" manufactured by Tosoh Co., Ltd. "A-5000" manufactured by Tosoh Co., Ltd. "F-1" manufactured by Tosoh Co., Ltd. "F-2" manufactured by Tosoh Co., Ltd. "F-4" manufactured by Tosoh Co., Ltd. "F-10" manufactured by Tosoh Co., Ltd. "F-20" manufactured by Tosoh Co., Ltd. "F-40" manufactured by Tosoh Co., Ltd. "F-80" manufactured by Tosoh Co., Ltd. "F-128" manufactured by Tosoh Co., Ltd. Sample: The resin solid content of maleimide obtained in the synthesis example was converted into 1.0% by mass of a tetrahydrofuran solution filtered with a microfilter (50 μl).

4) FD-MS mass spectrometry The FD-MS mass spectrum is measured using the following measuring device and measuring conditions. Measuring device: JMS-T100GC AccuTOF Measurement conditions Measuring range: m/z=4.00～2000.00 Change rate: 51.2mA/min Final current value: 45mA Cathode voltage: -10kV Recording interval: 0.07sec

[Synthesis example 1] Synthesis of maleimide compound A-1 (1) Synthesis of intermediate amine compound Put 2,6-dimethyl in a 1L flask equipped with a thermometer, cooling tube, Dean-Stark separator, and agitator 48.5 g (0.4 mol) of phenylaniline, 272.0 g (1.4 mol) of α,α'-dihydroxy-1,3-diisopropylbenzene, 280 g of xylene, and 70 g of activated clay were heated to 120°C while stirring. Furthermore, the temperature was raised to 210°C while removing the distilled water with a Dean-Stark tube, and the reaction was carried out for 3 hours. After cooling to 140°C, 145.4 g (1.2 mol) of 2,6-dimethylaniline was added, the temperature was raised to 220°C, and the reaction was carried out for 3 hours. After the reaction, the air was cooled to 100°C, diluted with 300 g of toluene, the activated clay was removed by filtration, and the solvent and unreacted substances were distilled off under reduced pressure to obtain the following general formula (A-1 364.1g of the intermediate amine compound represented by ). The amine equivalent weight is 298, and the softening point is 70°C.

(2) Maleic imidization A 2L flask equipped with a thermometer, a cooling tube, a Dean-Stark separator, and a stirrer was charged with 131.8 g (1.3 mol) of maleic anhydride and 700 g of toluene and stirred at room temperature. Next, a mixed solution of 364.1 g of the reactant (A-1) and 175 g of DMF was added dropwise over 1 hour. After the dripping, it was allowed to react for a further 2 hours at room temperature. After adding 37.1 g of p-toluenesulfonic acid monohydrate and heating the reaction liquid to cool and separate the water and toluene that were azeotropically boiled under reflux, only toluene was returned to the system and dehydration reaction was performed for 8 hours. After the air was cooled to room temperature, the brown solution was concentrated under reduced pressure to dissolve the brown solution in 600 g of ethyl acetate, and washed with 150 g of ion-exchanged water three times, and with 150 g of 2% sodium bicarbonate aqueous solution three times, and then dried by adding sodium sulfate. The reactant obtained by concentration under reduced pressure was vacuum dried at 80°C for 4 hours to obtain 413.0 g of a product containing maleimine compound A-1. In the FD-MS mass spectrum of the maleimide compound A-1, peaks of M+=560, 718, and 876 were confirmed, and each peak corresponds to the case where n is 0, 1, and 2. In addition, when GPC is used to obtain the value of the number n of repeating units in the indene skeleton portion of the maleimide A-1 (based on the number average molecular weight), the GPC chart is shown in Figure 1, n=1.47 , Molecular weight distribution (Mw/Mn)=1.81.

[Synthesis example 2] Synthesis of maleimide compound A-2 (1) Synthesis of intermediate amine compound Put 2,6-dimethyl in a 1L flask equipped with a thermometer, cooling tube, Dean-Stark separator, and agitator 48.5 g (0.4 mol) of phenylamine, 233.2 g (1.2 mol) of α,α'-dihydroxy-1,3-diisopropylbenzene, 230 g of xylene, and 66 g of activated clay were heated to 120°C while stirring. Furthermore, the temperature was raised to 210°C while removing the distilled water with a Dean-Stark tube, and the reaction was carried out for 3 hours. After cooling to 140°C, 145.4 g (1.2 mol) of 2,6-dimethylaniline was added, the temperature was raised to 220°C, and the reaction was carried out for 3 hours. After the reaction, the air was cooled to 100°C, diluted with 300 g of toluene, the activated clay was removed by filtration, and low molecular weight substances such as the solvent and unreacted materials were distilled off under reduced pressure to obtain the following general formula (A-2 278.4 g of the intermediate amine compound represented by ). The amine equivalent weight is 294, and the softening point is 65°C.

(2) Maleic imidization A 2L flask equipped with a thermometer, a cooling tube, a Dean-Stark separator, and a stirrer was charged with 107.9 g (1.1 mol) of maleic anhydride and 600 g of toluene and stirred at room temperature. Next, a mixed solution of 278.4 g of the reactant (A-2) and 150 g of DMF was added dropwise over 1 hour. After the dripping, it was allowed to react for a further 2 hours at room temperature. After adding 27.0 g of p-toluenesulfonic acid monohydrate and heating the reaction solution to cool and separate the water and toluene that were azeotropically boiled under reflux, only toluene was returned to the system and dehydration reaction was performed for 8 hours. After the air was cooled to room temperature, the brown solution was concentrated under reduced pressure to dissolve the brown solution in 500 g of ethyl acetate, washed with 120 g of ion-exchanged water 3 times, washed with 120 g of 2% sodium bicarbonate aqueous solution 3 times, and dried by adding sodium sulfate. The reactant obtained by concentration under reduced pressure was vacuum dried at 80°C for 4 hours to obtain 336.8 g of a product containing maleimine compound A-2. In the FD-MS mass spectrum of the maleimide compound A-2, it was confirmed that the peaks of M+=560, 718, and 876 correspond to the cases where n is 0, 1, and 2, respectively. In addition, when GPC is used to obtain the value of the number n of repeating units in the indene skeleton portion of the maleimide A-2 (based on the number average molecular weight), the GPC chart is shown in Figure 2, n=1.25 , Molecular weight distribution (Mw/Mn)=3.29.

[Synthesis example 3] Synthesis of maleimide compound A-3 (1) Synthesis of intermediate amine compound In a 2L flask equipped with a thermometer, cooling tube, Dean-Stark separator, and agitator, put 2,6-dimethyl 48.5 g (0.4 mol) of phenylamine, 388.6 g (2.0 mol) of α,α'-dihydroxy-1,3-diisopropylbenzene, 350 g of xylene, and 123 g of activated clay were heated to 120°C while stirring. Furthermore, the temperature was raised to 210°C while removing the distilled water with a Dean-Stark tube, and the reaction was carried out for 3 hours. After cooling to 140°C, 145.4 g (1.2 mol) of 2,6-dimethylaniline was added, the temperature was raised to 220°C, and the reaction was carried out for 3 hours. After the reaction, the air was cooled to 100°C, diluted with 500 g of toluene, the activated clay was removed by filtration, and low molecular weight substances such as the solvent and unreacted materials were distilled off under reduced pressure to obtain the following general formula (A-3 402.1g of the intermediate amine compound represented by ). The amine equivalent weight is 306, and the softening point is 65°C.

(2) Maleic imidization A 2L flask equipped with a thermometer, a cooling tube, a Dean-Stark separator, and a stirrer was charged with 152.1 g (1.5 mol) of maleic anhydride and 700 g of toluene and stirred at room temperature. Next, a mixed solution of 402.1 g of the reactant (A-3) and 200 g of DMF was added dropwise over 1 hour. After the dripping, it was allowed to react for a further 2 hours at room temperature. After adding 37.5 g of p-toluenesulfonic acid monohydrate, the reaction liquid was heated to cool and separate the azeotropic water and toluene under reflux, only toluene was returned to the system and dehydration reaction was performed for 8 hours. After the air was cooled to room temperature, the brown solution was concentrated under reduced pressure to dissolve the brown solution in 800 g of ethyl acetate, washed with 200 g of ion-exchanged water 3 times, washed with 200 g of 2% sodium bicarbonate aqueous solution 3 times, and dried by adding sodium sulfate. The reactant obtained by concentration under reduced pressure was vacuum dried at 80°C for 4 hours to obtain 486.9 g of a product containing maleimine compound A-3. In the FD-MS mass spectrum of the maleimide compound A-3, it was confirmed that the peaks of M+=560, 718, and 876 correspond to the cases where n is 0, 1, and 2, respectively. In addition, when GPC is used to obtain the value of the number of repeating units n (based on the number average molecular weight) in the indene skeleton portion of the maleimine A-3, the GPC chart is shown in Fig. 3, n=1.96 , Molecular weight distribution (Mw/Mn)=1.52.

[Synthesis example 4] Synthesis of maleimide compound A-4 (1) Synthesis of intermediate amine compound Put 2,6-diethyl in a 2L flask equipped with a thermometer, cooling tube, Dean-Stark separator, and agitator 59.7 g (0.4 mol) of phenylamine, 272.0 g (1.4 mol) of α,α'-dihydroxy-1,3-diisopropylbenzene, 350 g of xylene, and 94 g of activated clay were heated to 120°C while stirring. Furthermore, the temperature was raised to 210°C while removing the distilled water with a Dean-Stark tube, and the reaction was carried out for 3 hours. After cooling to 140°C, 179.1 g (1.2 mol) of 2,6-diethylaniline was added, the temperature was raised to 220°C, and the reaction was carried out for 3 hours. After the reaction, the air was cooled to 100°C, diluted with 500 g of toluene, the activated clay was removed by filtration, and low molecular weight substances such as the solvent and unreacted materials were distilled off under reduced pressure to obtain the following general formula (A-4 342.1g of the intermediate amine compound represented by ). The amine equivalent weight is 364, and the softening point is 47°C.

(2) Maleic imidization A 2L flask equipped with a thermometer, a cooling tube, a Dean-Stark separator, and a stirrer was charged with 107.9 g (1.1 mol) of maleic anhydride and 600 g of toluene and stirred at room temperature. Next, a mixed solution of 342.1 g of the reactant (A-4) and 180 g of DMF was added dropwise over 1 hour. After the dripping, it was allowed to react for a further 2 hours at room temperature. After adding 26.8 g of p-toluenesulfonic acid monohydrate and heating the reaction liquid to cool and separate the azeotropic water and toluene under reflux, only toluene was returned to the system and dehydration reaction was performed for 8 hours. After the air was cooled to room temperature, the brown solution was concentrated under reduced pressure to dissolve the brown solution in 500 g of ethyl acetate, and washed with 200 g of ion-exchanged water three times, with 200 g of 2% sodium bicarbonate aqueous solution three times, and dried by adding sodium sulfate. The reaction product obtained by concentration under reduced pressure was vacuum dried at 80°C for 4 hours to obtain 388.1 g of a product containing maleimine compound A-4. In the FD-MS mass spectrum of the maleimide compound A-4, it was confirmed that the peaks of M+=616, 774, and 932 correspond to the cases where n is 0, 1, and 2, respectively. In addition, when GPC is used to obtain the value of the number n of repeating units in the indene skeleton portion of the maleimine A-4 (based on the number average molecular weight), the GPC chart is shown in Fig. 4, n=1.64 , Molecular weight distribution (Mw/Mn)=1.40.

[Synthesis Example 5] Synthesis of Maleimide Compound A-5 (1) Synthesis of Intermediate Amine Compound In a 1L flask equipped with a thermometer, cooling tube, Dean-Stark separator and agitator, put 2,6-diiso 70.9 g (0.4 mol) of propylaniline, 272.0 g (1.4 mol) of α,α'-dihydroxy-1,3-diisopropylbenzene, 350 g of xylene, and 97 g of activated clay were heated to 120°C while stirring. Furthermore, the temperature was raised to 210°C while removing the distilled water with a Dean-Stark tube, and the reaction was carried out for 3 hours. After cooling to 140°C, 212.7 g (1.2 mol) of 2,6-diisopropylaniline was added, the temperature was raised to 220°C, and the reaction was carried out for 3 hours. After the reaction, the air was cooled to 100°C, diluted with 500 g of toluene, the activated clay was removed by filtration, and low molecular weight substances such as the solvent and unreacted substances were distilled off under reduced pressure to obtain the following general formula (A-5 317.5g of the intermediate amine compound represented by ). The amine equivalent weight is 366, and the softening point is 55°C.

(2) Maleic imidization A 2L flask equipped with a thermometer, a cooling tube, a Dean-Stark separator, and a stirrer was charged with 107.9 g (1.1 mol) of maleic anhydride and 600 g of toluene and stirred at room temperature. Next, a mixed solution of 317.5 g of reactant (A-5) and 175 g of DMF was added dropwise over 1 hour. After the dripping, it was allowed to react for a further 2 hours at room temperature. After adding 24.8 g of p-toluenesulfonic acid monohydrate and heating the reaction liquid to cool and separate the water and toluene that were azeotropically boiled under reflux, only toluene was returned to the system and dehydration reaction was performed for 8 hours. After the air was cooled to room temperature, the brown solution was concentrated under reduced pressure to dissolve the brown solution in 600 g of ethyl acetate, and washed with 200 g of ion-exchanged water 3 times, washed with 200 g of 2% sodium bicarbonate aqueous solution 3 times, and dried by adding sodium sulfate. The reactant obtained by concentration under reduced pressure was vacuum dried at 80° C. for 4 hours to obtain 355.9 g of a product containing maleimine compound A-5. In the FD-MS mass spectrum of the maleimide compound A-5, it was confirmed that the peaks of M+=672, 830, and 988 correspond to the cases where n is 0, 1, and 2, respectively. In addition, when GPC is used to obtain the value of the number of repeating units n in the indene skeleton portion of the maleimide A-5 (based on the number average molecular weight), the GPC chart is shown in Fig. 5, n=1.56 , Molecular weight distribution (Mw/Mn)=1.24.

[Synthesis example 6] Synthesis of maleimine compound A-9 (1) Synthesis of intermediate amine compound In the aforementioned synthesis method of intermediate amine compound A-1, the reaction time at 210°C was changed to 6 hours, The reaction time at 220°C was changed to 3 hours and the same operation was performed to obtain 345.2 g of an intermediate amine compound represented by the following general formula (A-9). The amine equivalent weight is 348, and the softening point is 71°C.

(2) Maleimidization From the synthetic method of maleimine compound A-1 described above, the intermediate was replaced with A-9 and the same operation was performed to obtain the maleimide-containing compound A-9.物407.6g. In the FD-MS mass spectrum of the maleimide compound A-9, peaks of M+=560, 718, and 876 were confirmed, and each peak corresponds to the case where n is 0, 1, and 2. In addition, when GPC is used to obtain the value of the number of repeating units in the indene skeleton portion of the maleimine A-9 (based on the number average molecular weight), the GPC chart is shown in Figure 6, n=2.59 , Molecular weight distribution (Mw/Mn)=1.49.

[Synthesis Example 7] The synthesis of maleimide compound A-10 In addition to the above-mentioned synthesis method of intermediate amine compound A-1, the reaction time at 210°C was changed to 6 hours, and the reaction time at 220°C was changed to The same operation was performed for 3 hours. For the synthesized intermediate amine compound (amine equivalent of 347, softening point of 71°C), the dehydration reaction under reflux in the maleimination reaction was set to other than 10 hours. Under the same conditions as the aforementioned synthesis method of maleimine compound A-1, 415.6 g of a product containing maleimine compound A-10 was obtained. In the FD-MS mass spectrum of the maleimide compound A-10, the peaks of M+=560, 718, and 876 were confirmed, and each peak corresponds to the case where n is 0, 1, and 2. In addition, when GPC is used to obtain the value of the number of repeating units in the indene skeleton portion of the maleimine A-10 (based on the number average molecular weight), the GPC chart is shown in Figure 7, n=2.91 , Molecular weight distribution (Mw/Mn)=1.64.

[Synthesis Example 8] The synthesis of maleimide compound A-11 In addition to the aforementioned synthesis method of intermediate amine compound A-1, the reaction time at 210°C was changed to 9 hours, and the reaction time at 220°C was changed to The same operation was performed for 3 hours. For the synthesized intermediate amine compound (amine equivalent of 342, softening point of 69°C), the dehydration reaction under reflux in the maleimination reaction was set to other than 10 hours. Under the same conditions as the aforementioned synthetic method of maleimine compound A-1, 398.7 g of a product containing maleimine compound A-11 was obtained. In the FD-MS mass spectrum of the maleimide compound A-11, peaks of M+=560, 718, and 876 were confirmed, and each peak corresponds to the case where n is 0, 1, and 2. In addition, when GPC is used to obtain the value of the number of repeating units in the indene skeleton portion of the maleimine A-11 (based on the number average molecular weight), the GPC chart is shown in Figure 8, n=3.68 , Molecular weight distribution (Mw/Mn)=2.09.

[Synthesis Example 9] The synthesis of maleimide compound A-12 In addition to the aforementioned synthesis method of intermediate amine compound A-1, the reaction time at 210°C was changed to 9 hours, and the reaction time at 220°C was changed to The same operation was carried out for 3 hours. For the synthesized intermediate amine compound (amine equivalent of 347, softening point of 70°C), the dehydration reaction under reflux in the maleimination reaction was set to other than 12 hours. Under the same conditions as the aforementioned synthesis method of maleimine compound A-1, 422.7 g of a product containing maleimine compound A-12 was obtained. In the FD-MS mass spectrum of the maleimide compound A-12, peaks of M+=560, 718, and 876 were confirmed, and each peak corresponds to the case where n is 0, 1, and 2. In addition, when GPC is used to obtain the value of the number of repeating units n in the indene skeleton portion of the maleimine A-12 (based on the number average molecular weight), the GPC chart is shown in Figure 9, n=4.29 , Molecular weight distribution (Mw/Mn)=3.02.

[Examples 1-9, and Comparative Example 1] ＜Solvent solubility of maleimide＞ The maleimines (A-1)～(A-5), (A-9)～(A-12) obtained in Synthesis Examples 1-9, and the commercially available maleimines ( A-6) (4,4'-Diphenylmethane bismaleimide, "BMI-1000" manufactured by Daiwa Chemical Industry Co., Ltd.) Evaluation of the solubility of toluene and methyl ethyl ketone (MEK) , The evaluation results are shown in Table 1. As an evaluation method of solvent solubility, toluene was prepared using the maleimides obtained in the above synthesis examples and comparative examples to prepare toluene so that the non-volatile content became 10, 20, 30, 40, 50, 60, and 70% by mass. Solution, and methyl ethyl ketone (MEK) solution. Specifically, the vials containing the maleimines obtained in the above synthesis examples and comparative examples were placed at room temperature (25°C) for 60 days, and in each solution composed of each non-volatile component, it was uniform The evaluation (visual observation) of the dissolved state (without insoluble matter) was ○, and the evaluation (visual observation) of the undissolved state (with insoluble matter) was ×. In addition, when the non-volatile content is 20% by mass or more, it is practically preferable as long as it is soluble in a solvent.

[Examples 10 to 18 and Comparative Examples 2 to 4] ＜Preparation of curable resin composition＞ The maleimines (A-1)～(A-5), (A-9)～(A-12) obtained in Synthesis Examples 1-9, and maleimines (A-6) for comparison (4,4'-Diphenylmethane bismaleimide, "BMI-1000" manufactured by Daiwa Chemical Industry Co., Ltd.), comparative maleimide (A-7) (bisphenol A diphenyl) Ether bismaleimide, "BMI-4000" manufactured by Daiwa Chemical Industry Co., Ltd.), comparative maleimide (A-8) (3,3'-dimethyl-5,5'-bis Ethyl-4,4'-diphenylmethane bismaleimide, "BMI-5100" manufactured by Daiwa Chemical Industry Co., Ltd.), cyanate ester compound (B-1) (2,2-bis(4) -Cyanooxyphenyl)propane (manufactured by Tokyo Chemical Industry Co., Ltd.), hardening accelerator (C-1) (tetraphenylphosphonium tetrakis (methylphenyl) borate (manufactured by Beixing Chemical Industry Co., Ltd.) ) Blend in the ratio shown in Table 2.

＜The uniformity of film appearance＞ In Examples 10, 15 to 18, and Comparative Examples 2 to 4, 14.81 g of methyl ethyl ketone (MEK) was mixed and dissolved in the ratio shown in Table 2 to obtain a curable resin composition. 5g of each curable resin composition was coated on a release PET film (thickness after drying: 295μm), dried (heated) at 80°C for 1 hour, and further dried (heated) at 120°C for 1 hour, thereby A formed film was produced, and the appearance of the obtained formed film was confirmed visually. The case where the film appearance is uniform is evaluated as ○, and the case where the film appearance is not uniform is evaluated as × (for example, the case where turbidity, insoluble matter, etc. can be confirmed). The evaluation results are shown in Table 3.

＜Preparation of hardened product (molded product)＞ A cured product (molded product) is produced by applying the above-mentioned curable resin composition to the following conditions. Curing conditions: After heating at 200°C for 2 hours, it is further heated and cured at 250°C for 2 hours. The thickness of the cured product (molded product) after molding: 2.4mm For the obtained cured products of Examples 10 to 18 and Comparative Example 2, various physical properties and characteristics were evaluated by the following methods. The evaluation results are shown in Table 4.

＜Glass transition temperature (Tg)＞ Cut a hardened product with a thickness of 2.4 mm to a size of 5 mm in width and 54 mm in length, and use this as a test piece. For this test piece, a viscoelasticity measuring device (DMA: a solid viscoelasticity measuring device "DMS6100" manufactured by Hitachi High-Tech Science Co., Ltd., Min.), the temperature at which the change in the coefficient of elasticity becomes the largest (the tanδ change rate is the largest) is evaluated as the glass transition temperature Tg (°C). In addition, from the viewpoint of heat resistance, the glass transition temperature Tg is preferably 250°C or higher (higher Tg), and more preferably 260°C or higher.

＜Thermal expansion property＞ Cut a hardened product with a thickness of 2.4 mm to a size of 5 mm in width and 5 mm in length, and use this as a test piece. The thermal analysis device (“TMA/SS6100” manufactured by SII Technologies, 3°C/min.) was used for this test piece to measure the coefficient of thermal expansion CTE (ppm) in the range of 40 to 60°C. In addition, from the viewpoint of heat resistance, warpage prevention, etc., the thermal expansion coefficient is preferably 60 ppm or less, and more preferably 55 ppm or less.

＜Dielectric characteristics＞ According to JIS-C-6481, using the network analyzer "E8362C" manufactured by Agilent Technologies Co., Ltd. and using the cavity resonance method, the test specimens stored in an absolutely dry room at 23°C and humidity 50% for 24 hours are measured at 1GHz The dielectric constant and dielectric loss tangent below. In addition, as the dielectric constant and the dielectric loss tangent, from the viewpoint of reducing the transmission loss as an electronic material, the dielectric constant is preferably 2.80 or less, and more preferably 2.70 or less. In addition, the dielectric loss tangent is preferably 0.0050 or less, and more preferably 0.0040 or less.

[Table 1] Solvent solubility evaluation Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Example 9 Comparative example 1 Maleimide A-1 A-2 A-3 A-4 A-5 A-9 A-10 A-11 A-12 A-6 Non-volatile components of toluene solution 10% ○ ○ ○ ○ ○ ○ ○ ○ ○ X 20% ○ ○ ○ ○ ○ ○ ○ ○ ○ X 30% ○ X ○ ○ ○ ○ ○ ○ ○ X 40% X X ○ ○ ○ ○ ○ ○ ○ X 50% X X ○ ○ ○ ○ ○ ○ ○ X 60% X X ○ X ○ ○ ○ ○ ○ X 70% X X ○ X X ○ ○ ○ ○ X Non-volatile components of MEK solution 10% ○ ○ ○ ○ ○ ○ ○ ○ ○ X 20% ○ ○ ○ ○ ○ ○ ○ ○ ○ X 30% ○ ○ ○ ○ ○ ○ ○ ○ ○ X 40% ○ ○ ○ ○ ○ ○ ○ ○ ○ X 50% ○ ○ ○ ○ ○ ○ ○ ○ ○ X 60% X X ○ ○ ○ ○ ○ ○ ○ X 70% X X ○ ○ ○ ○ ○ ○ ○ X

[Table 2] Blending amount (g number) Example 10 Example 11 Example 12 Example 13 Example 14 Example 15 Example 16 Example 17 Example 18 Comparative example 2 Comparative example 3 Comparative example 4 A-1 15.40 A-2 15.40 A-3 15.40 A-4 15.40 A-5 15.40 A-6 15.40 A-7 15.40 A-8 15.40 A-9 15.40 A-10 15.40 A-11 15.40 A-12 15.40 B-1 6.60 6.60 6.60 6.60 6.60 6.60 6.60 6.60 6.60 6.60 6.60 6.60 C-1 0.22 0.22 0.22 0.22 0.22 0.22 0.22 0.22 0.22 0.22 0.22 0.22

[table 3] Example 10 Example 15 Example 16 Example 17 Example 18 Comparative example 2 Comparative example 3 Comparative example 4 Uniformity of film appearance ○ ○ ○ ○ ○ X X X

[Table 4] Property evaluation unit Example 10 Example 11 Example 12 Example 13 Example 14 Example 15 Example 16 Example 17 Example 18 Comparative example 2 Glass transition temperature Tg(DMA) °C 290 288 278 284 284 285 282 282 278 278 Coefficient of thermal expansion CTE (40～60℃) ppm 46 48 50 49 51 49 48 50 53 50 Dielectric constant (1GHz) - 2.59 2.65 2.63 2.64 2.65 2.63 2.61 2.59 2.60 2.98 Dielectric loss tangent (1GHz) - 0.0027 0.0035 0.0034 0.0036 0.0038 0.0035 0.0033 0.0032 0.0032 0.0064

From the evaluation results in Table 1 above, it can be confirmed that in Examples 1-9, maleimide having a dihydroindene skeleton was used, so when the toluene solution was prepared, the non-volatile content was 20% by mass. It is soluble, and it can dissolve even if the non-volatile content is 50% by mass when preparing the MEK solution, and it has excellent solvent solubility. On the other hand, it can be confirmed that the commercially available maleimide used in Comparative Example 1 does not have a dihydroindene skeleton in the structure and has poor solvent solubility.

From the evaluation results in Table 3 above, it can be confirmed that in Examples 10, 15 to 18, the curable resin composition solution (varnish) containing the maleimide having a dihydroindene skeleton was coated and dried. The appearance is uniform, and it can also be used in applications such as circuit boards (copper-clad laminates, etc.) including build-up films that require the uniformity of the appearance of the resulting film. On the other hand, it can be confirmed that in Comparative Examples 2 to 4, since a commercially available maleimide without a dihydroindene skeleton was used, the appearance of the film was not uniform, and it was difficult to use it for build-up films and circuit boards ( Copper-clad laminate, etc.) and other uses.

In addition, from the evaluation results in Table 4 above, it can be confirmed that in Examples 10 to 18, in addition to the maleimide having a dihydroindene skeleton, the use of a product that also contributes to heat resistance and dielectric properties The cyanate ester compound (B) has a high glass transition temperature, excellent heat resistance, and further has low thermal expansion. The dielectric constant and dielectric loss tangent are also suppressed to be low, and the dielectric properties are excellent. On the other hand, it can be confirmed that in Comparative Example 2, since maleimide having a dihydroindene skeleton was not used, the dielectric constant and the dielectric loss tangent system could not be suppressed to be low relative to the examples. The electrical characteristics are also inferior. [Possibility of Industrial Utilization]

The curable resin composition of the present invention is excellent in heat resistance and dielectric properties of the cured product, so it can be ideally used in heat-resistant components and electronic components, especially in semiconductor packaging materials, circuit boards, and build-up films. , Build-up substrates, etc., adhesives, photoresist materials. In addition, it can also be ideally used as a matrix resin for fiber-reinforced resin, and is suitable as a prepreg with high heat resistance.

no.

Figure 1 is a GPC chart of the maleimide compound (A-1) obtained in Synthesis Example 1. Figure 2 is a GPC chart of the maleimide compound (A-2) obtained in Synthesis Example 2. Fig. 3 is a GPC chart of the maleimide compound (A-3) obtained in Synthesis Example 3. Figure 4 is a GPC chart of the maleimide compound (A-4) obtained in Synthesis Example 4. Figure 5 is a GPC chart of the maleimide compound (A-5) obtained in Synthesis Example 5. Figure 6 is a GPC chart of the maleimide compound (A-9) obtained in Synthesis Example 6. Fig. 7 is a GPC chart of the maleimide compound (A-10) obtained in Synthesis Example 7. Fig. 8 is a GPC chart of the maleimide compound (A-11) obtained in Synthesis Example 8. Fig. 9 is a GPC chart of the maleimide compound (A-12) obtained in Synthesis Example 9.

no.

Claims (8)

A curable resin composition characterized by containing a maleimide (A) having a dihydroindene skeleton and a cyanate ester compound (B). The curable resin composition of claim 1, wherein the maleimide (A) is represented by the following general formula (1),

(In formula (1), Ra each independently represents an alkyl group, alkoxy group or alkylthio group having 1 to 10 carbon atoms, an aryl group having 6 to 10 carbon atoms, aryloxy group or arylthio group, and a carbon number of 3-10 The cycloalkyl group, halogen atom, nitro group, hydroxyl group or mercapto group, q represents an integer value from 0 to 4; when q is 2 to 4, Ra may be the same or different in the same ring; Rb each independently represents the number of carbons 1-10 alkyl, alkoxy or alkylthio, aryl with 6-10, aryloxy or arylthio, cycloalkyl with 3-10, halogen atom, hydroxyl or mercapto, r Represents an integer value of 0 to 3; when r is 2 to 3, Rb may be the same or different in the same ring; n is the average number of repeating units, which represents a value of 0.5 to 20). A hardened product characterized by hardening and reacting the hardening resin composition of claim 1 or 2. A prepreg characterized by having a reinforcing base material and a semi-hardened material of the curable resin composition of claim 1 or 2 impregnated in the reinforcing base material. A circuit board characterized by laminating the prepreg as in claim 4 and copper foil, and forming it by heating and pressing. A build-up film characterized by containing the curable resin composition according to any one of claims 1 to 3. A semiconductor packaging material characterized by containing the curable resin composition according to any one of claims 1 to 3. A semiconductor device characterized by comprising a hardened product obtained by heating and hardening the semiconductor packaging material according to claim 7.

Images