JP2912470B2 - Resin composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a resin composition having excellent heat resistance and crack resistance. In other words, it relates to a resin composition for improving heat resistance and crack resistance as an insulating material, a laminate material, and a resin sealing material in the fields of electronic and electric components, semiconductors, etc., and is particularly required to have solder crack resistance. The present invention relates to a resin composition suitable for sealing a semiconductor device.

[0002]

2. Description of the Related Art In recent years, resin compositions having excellent heat resistance and crack resistance have been demanded in the fields of electric / electronic parts and semiconductors. For example, in the field of electric and electronic components, especially in the field of semiconductors, the mounting density on a wiring board on which components are mounted tends to increase with the miniaturization and thinning of devices and devices that use them, and the components themselves Also tend to be multifunctional. As a material for encapsulating the resin, there is a strong demand for the development of a resin composition having excellent heat resistance to high-temperature solder in a step of soldering to a wiring board.

Conventionally, as a resin composition for such an application, a so-called resin composition for semiconductor encapsulation, an epoxy resin represented by an O-cresol novolak type epoxy resin, and a phenol novolak resin and silica as a curing agent thereof have been used. A resin composition as a main component is excellent in moldability and reliability, and has become a mainstream in this field. "Edited by Hiroshi Kakiuchi; Epoxy resin, P80, Shokodo Co., Ltd."

[0004]

However, with respect to the resin-sealed type semiconductor device, it has been changed to a surface-mounted type semiconductor device due to the flow of high-density mounting described above.
In such a surface-mount type semiconductor device, unlike the conventional insertion type semiconductor device, the entire semiconductor device is exposed to a soldering temperature of 200 ° C. or more in the step of soldering to the substrate.
At this time, cracks occur in the sealing resin, and a problem has arisen that reliability of the semiconductor device is significantly reduced. "Magazine; Nikkei Electronics June 13, 1988 Issue 11
4 to 118 "This crack at the time of soldering
During storage of the semiconductor device, the moisture absorbed expands explosively at a temperature of 200 ° C. or more, generating stress, and cracking occurs when the strength exceeds the strength of the sealing resin. At this time, the stress applied to the resin is approximately expressed by the following equation. "Edited by Narioka, Niwa, Yamada, Shiraishi; Structural Mechanics III, Maruzen" σ = k · p · a ² / t ^{2 where} σ: stress applied to resin k: constant p: water vapor pressure a: length of short side of die pad t: Thickness of Resin Under Die Pad Accordingly, as shown in, for example, JP-A-1-213335, JP-A-1-254735, JP-A-2-32117, etc., the glass transition temperature of the sealing resin is increased. Imide-based resins have been studied for the purpose of imparting sufficient resin strength to overcome the stress generated by the expansion of water. However, a cured product of an imide resin tends to have an increased water absorption rate, and considering the above formula, it is impossible to utilize the high strength characteristic of the imide resin by increasing the stress applied to the resin. Therefore, reducing the water vapor pressure during soldering by reducing the water absorption is an effective means for suppressing the occurrence of cracks.

An object of the present invention is to provide a resin composition having excellent heat resistance, crack resistance, and low moisture absorption, which can be applied to a resin-encapsulated semiconductor device requiring solder crack resistance during mounting. Another object of the present invention is to provide a resin composition which can be widely applied to electronic and electric parts for improving heat resistance and crack resistance of insulating materials and laminates.

[0006]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, have used a polymaleimide which can be cured at a relatively low temperature as an imide resin, By using an epoxy compound having a low naphthalene ring in combination, the strength was significantly improved without increasing the water absorption of the sealing resin, and the present invention was completed.

That is, the present invention provides an organic component comprising a polymaleimide represented by the general formula (1), an epoxy compound having a naphthalene ring represented by the general formula (2) and a compound having two or more phenolic hydroxyl groups, And a inorganic filler.

More specifically, (1). As the component (A), (a) a general formula (1);

[0009]

Embedded image Wherein R ₁ represents an m-valent organic group having at least 2 carbon atoms, and m represents a positive integer of 2 or more, and (b) a general formula (2) ;

[0010]

Embedded image (Wherein n represents an integer of 0 to 5) or an epoxy compound containing 30 to 100% of the compound; and (c) a phenol compound having two or more phenolic hydroxyl groups. A resin composition containing an organic component mainly composed of (A) and an inorganic filler as a component (B); (2). (3) a resin composition for semiconductor encapsulation substantially comprising the resin composition according to (1); The resin composition according to (1) or (2), wherein the total amount of the component (b) and the component (c) is 10 to 500 parts by weight with respect to 100 parts by weight of the polymaleimide compound as the component (a). 4). The ratio of the component (b) to the component (c) is based on the epoxy group of the component (b).
(C) The resin composition according to (1) or (2), wherein the ratio of the phenolic hydroxyl group in the component is in the range of 0.1 to 10.
(5). The resin composition according to (1) or (2), wherein the amount of the inorganic filler (B) is 100 to 900 parts by weight based on 100 parts by weight of the total amount of the organic component (A).
(6). The polymaleimide compound of the component (a) has the general formula (3)

[0011]

Embedded image (7). The resin composition according to (1) or (2), comprising a polymaleimide represented by the formula (1).
The epoxy compound of component (b) contains 0 to 70% by weight of the epoxy compound represented by the general formula (4), (5) and / or (6) (1) or (2). )) The resin composition according to the above,

[0012]

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[0013]

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[0014]

Embedded image (8). The phenolic compound of the component (c) is an aralkyl resin represented by the general formula (7), (8), (9), (10) or (11) and / or the general formula (12)
The resin composition according to (1) or (2), comprising a dicyclopentadiene phenol resin represented by the following formula:

[0015]

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[0016]

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[0017]

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[0018]

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[0019]

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[0020]

Embedded image (9). The inorganic filler of the component (B) is crystalline silica, fused silica, alumina, diatomized silicate, diatomized talc,
Calcium silicate, calcium carbonate, mica, clay,
The resin composition according to (1) or (2), which is at least one selected from the group consisting of titanium white, glass fiber, and carbon fiber.

In the composition of the present invention, the organic component (A)
The component (a) used is a polymaleimide compound represented by the general formula (1). The polymaleimide compound represented by the general formula (1) is a compound having two or more maleimide groups in one molecule.

Examples of such a polymaleimide compound include N, N'-ethylenebismaleimide, N, N'-hexamethylenebismaleimide, N, N '-(1,3-phenylene)
Bismaleimide, N, N '-(1,4-phenylene) bismaleimide, bis (4-maleimidophenyl) methane, bis (4-maleimidophenyl) ether, bis (3-chloro-4-maleimidophenyl) methane, bis (4-maleimidophenyl) sulfone, bis (4-maleimidocyclohexyl) methane, 1,4-bis (4-maleimidophenyl) cyclohexane, 1,4-bis (maleimidomethyl) cyclohexane, 1,
4-bis (maleimidomethyl) benzene, 1,3-bis (4-maleimidophenoxy) benzene, 1,3-bis (3-maleimidophenoxy) benzene, bis [4- (3-maleimidophenoxy) phenyl] methane, bis [4- (4-maleimidophenoxy) phenyl] methane, 1,1-bis [4- (3-maleimidophenoxy) phenyl] ethane, 1,1-bis [4- (4-
Maleimidophenoxy) phenyl] ethane, 1,2-bis
[4- (3-maleimidophenoxy) phenyl] ethane, 1,2-
Bis [4- (4-maleimidophenoxy) phenyl] ethane, 2,2-bis [4- (3-maleimidophenoxy) phenyl] propane, 2,2-bis [4- (4-maleimidophenoxy) phenyl] propane, 2,2-bis [4- (3-maleimidophenoxy) phenyl] butane, 2,2-bis [4- (4-maleimidophenoxy) phenyl] butane, 2,2-bis [4- (3
-Maleimidophenoxy) phenyl] -1,1,1,1,3,3,3-hexafluoropropane, 2,2-bis [4- (4-maleimidophenoxy) phenyl] -1,1,1,3,3, 3-hexafluoropropane, 4,4'-bis (3-maleimidophenoxy) biphenyl, 4,4'-bis (4-maleimidophenoxy) biphenyl, bis [4- (3-maleimidophenoxy) phenyl] ketone, bis [ 4- (4-maleimidophenoxy) phenyl]
Ketone, bis [4- (3-maleimidophenoxy) phenyl] sulfide, bis [4- (4-maleimidophenoxy)
Phenyl] sulfide, bis [4- (3-maleimidophenoxy) phenyl] sulfoxide, bis [4- (4-maleimidophenoxy) phenyl] sulfoxide, bis [4- (3-
Maleimidophenoxy) phenyl] sulfone, bis [4-
(4-maleimidophenoxy) phenyl] sulfone, bis
[4- (3-maleimidophenoxy) phenyl] ether,
Bis [4- (4-maleimidophenoxy) phenyl] ether, polymaleimidophenylmethylene, and general formula (3):

[0023]

Embedded image (Wherein, 1 is an average of 0 to 10). These polymaleimide compounds may be used alone or as a mixture of two or more.

The component (b) used as the organic component (A) in the composition of the present invention is an epoxy compound represented by the general formula (2) or epoxy compounds containing the compound. That is, even if the epoxy compound represented by the general formula (2) is used alone as the component (b),
Alternatively, other epoxy compounds may be mixed and used.

The epoxy compound represented by the general formula (2) is obtained by reacting a reaction product obtained by a condensation reaction of α-hydroxynaphthalene or β-hydroxynaphthalene with p-hydroxybenzaldehyde with epichlorohydrin. Can be

The polyhydric epoxy compound used in combination with the epoxy compound represented by the general formula (2), which is an essential component, includes phenol and substituted phenols and aldehydes in view of heat resistance and electric properties. General formula (4) derived from a novolak type phenol resin which is a reaction product;

[0027]

Embedded image (In the formula, R ₄ represents a hydrogen atom or an alkyl group having 1 to 9 carbon atoms, and p represents an integer of 1 or more.) An epoxy resin represented by the following formula is most preferably used. Any one having two epoxy groups can be used. Specifically, an epoxy resin derived from a compound having two or more active hydrogens in one molecule, for example,
Bisphenol A, bisphenol F, resorcinol, bishydroxydiphenyl ether, bishydroxybiphenyl, tetrabromobisphenol A, trihydroxyphenylmethane, tetrahydroxyphenylethane,
Polyhydric phenols such as alkanetetrakisphenol;
Polyhydric alcohols such as ethylene glycol, neopentyl glycol, glycerin, trimethylolpropane, pentaerythritol, diethylene glycol, and polypropylene glycol; ethylenediamine, aniline,
Amines such as bis (4-aminophenyl) methane; epoxy resins obtained by reacting polycarboxylic acids such as adipic acid, phthalic acid and isophthalic acid with epichlorohydrin or 2-methylepichlorohydrin; (6);

[0028]

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[0029]

Embedded image (Wherein, x represents an integer of 0 to 5), and one or more of these epoxy resins are used. Further, the epoxy resin can be used after being modified with a silicone compound such as an oil or rubber. For example, JP-A-62-270617, JP-A-62-270617
As disclosed in Japanese Patent No. 273222, a silicone-modified epoxy resin produced by dispersing fine particles of a silicone polymer in a reaction product of an epoxy resin and a vinyl polymer.

In the composition of the present invention, the phenol compound having two or more phenolic hydroxyl groups in one molecule as the component (C) is phenol or a reaction product of a substituted phenol with an aldehyde. General formula (7)

[0031]

Embedded image (Wherein, R ₃ represents a hydrogen atom, a hydroxyl group or an alkyl group having 1 to 9 carbon atoms, and r represents an integer of 1 or more), and a novolak-type phenol resin represented by the following formula is most preferably used. A phenolic compound, for example, of the general formula (8), (9), (10) or (11);

[0032]

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[0033]

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[0034]

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[0035]

Embedded image (Wherein, q represents an integer of 0 to 5), an aralkyl resin represented by the general formula (12):

[0036]

Embedded image (Wherein, R ₂ represents a hydrogen atom or an alkyl group having 4 or less carbon atoms, and n represents an integer of 0 to 5), a dicyclopentadiene phenol resin represented by the formula: Phenylethane,
Alkane tetrakisphenol and the like can be mentioned. These phenol compounds can be used alone or in combination of two or more.

In the composition of the present invention, the component (a) is a polymaleimide compound represented by the general formula (1), the component (b) is an epoxy compound represented by the general formula (2) or an epoxy compound containing the compound. The compounding amount of the compound and the phenolic compound having two or more phenolic hydroxyl groups of the component (c) is such that the total amount of the component (b) and the component (c) is 10 to 100 parts by weight of the component (a). 500 parts by weight, preferably 25 to
300 parts by weight, and the compound having two or more phenolic hydroxyl groups of the component (c) is equivalent to the epoxy compound represented by the general formula (2) of the component (b) or epoxy compounds containing the compound. Ratio in the range of 0.1 to 10, preferably
It is in the range of 0.5 to 2.0.

In the present invention, the resin composition may be blended and kneaded as usual, or the polymaleimide compound may be partially or wholly contained in the above component (b) or a mixture of components (b) and (c). May be dissolved in advance, or they may be used as a prepolymer obtained by reacting them.

The inorganic filler used as the component (B) in the composition of the present invention may be an inorganic powder or a fibrous material. Examples thereof include crystalline silica, fused silica, alumina and silicon nitride. , Silicon carbide, talc, calcium silicate, calcium carbonate, mica, clay,
There are powders such as titanium white; fibrous bodies such as glass fiber and carbon fiber, and crystalline and fusible silica powder is preferred from the viewpoint of the coefficient of thermal expansion and thermal conductivity. Further, from the viewpoint of fluidity during molding, a spherical or a mixture of spherical and amorphous silica powder is preferable.

The amount of the inorganic filler (B) is as follows:
Component (a), a polymaleimide compound represented by the general formula (1), component (b), an epoxy compound represented by the general formula (2) or an epoxy compound containing the compound, and (c)
It is necessary that the amount be 100 to 900 parts by weight, preferably 200 to 600 parts by weight, based on 100 parts by weight of the total amount of the phenolic compound having two or more phenolic hydroxyl groups of the component.

Further, the above-mentioned inorganic filler has mechanical strength,
From the viewpoint of heat resistance, it is preferable to use a coupling agent in combination for the purpose of improving the adhesiveness with the resin. Examples of such a coupling agent include silane-based, titanate-based, aluminate-based, and zircoaluminate-based coupling agents. Agents can be used. Among them, a silane coupling agent is preferable, and a silane coupling agent having a reactive functional group is most preferable.

Examples of the silane coupling agent include vinyltrimethoxysilane, vinyltriethoxysilane, N- (2-aminoethyl) 3-aminopropylmethyldimethoxysilane, and N- (2-aminoethyl) 3-
Aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-anilinopropyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldimethoxysilane, 2- (3,4- Epoxycyclohexyl) ethyltrimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane and the like can be mentioned, and one or more of these are used. It is preferable that these silane coupling agents are previously fixed to the surface of the inorganic filler by adsorption or reaction.

In the present invention, in curing the resin composition, it is desirable to include a curing accelerator.
As such a curing accelerator, 2-methylimidazole,
Imidazoles such as 2-methyl-4-ethylimidazole and 2-heptadecylimidazole; amines such as triethanolamine, triethylenediamine and N-methylmorpholine; organic phosphines such as tributylphosphine, triphenylphosphine and tolylphosphine. ;
Tetraphenylphosphonium tetraphenylborate,
Tetraphenylboron salts such as triethylammonium tetraphenylborate; and 1,8-diaza-bicyclo (5,4,0) undecene-7 and derivatives thereof. These curing accelerators may be used alone or in combination of two or more, and if necessary, an organic peroxide or an azo compound may be used in combination.

The content of these curing accelerators depends on the amount of the polymaleimide compound represented by the general formula (1) of component (a),
0.01 to 10 to the total amount of the epoxy compound represented by the general formula (2) of the component (b) or the epoxy compounds containing the compound and the compound having two or more phenolic hydroxyl groups of the component (c). % By weight.

The resin composition of the present invention may contain various components and, if necessary, an imide resin such as diallyl phthalate, triallyl isocyanurate, or o, o'-diallylbisphenol A, which is generally used. Diluents; various silicone oils; release agents such as fatty acids, fatty acid salts, and waxes; flame retardants such as bromo compounds, antimony, and phosphorus; and coloring agents such as carbon black, and mixed and kneaded to form molding materials. be able to.

[0046]

The present invention will be described below in more detail with reference to examples. In addition, in the Example, the test method of the performance of a composition is as follows.・ Glass transition temperature: TMA method ・ Bending strength and flexural modulus: JIS K-6911 ・ Water absorption: Using a test piece for bending test, leave it in a constant temperature and humidity chamber of 65 C, 95% for 168 hours Measure the weight increase of・ VPS test: After leaving the test semiconductor device in a 65 ° C, 95% constant temperature and humidity chamber for 168 hours, immediately put it in a 260 ° C molten solder bath and count the number of semiconductor devices with cracks in the package resin. I counted. (The numerator is the number of semiconductor devices with cracks, and the denominator is the total number of semiconductor devices subjected to the test.) Synthesis example of epoxy compound In a reaction vessel equipped with a thermometer, a stirrer and a cooler, 720 g of α-hydroxynaphthalene, 305 g of p-hydroxybenzaldehyde, and 0.3 g of sodium p-toluenesulfonate
, And reacted at 150 ° C. for 6 hours while stirring. Then, after dissolving and washing in 1500 ml of toluene, toluene and unreacted monomers were removed by distillation under reduced pressure (150 C, 5 mmHg) to obtain a polyvalent hydroxynaphthalene compound having a hydroxyl equivalent of 131.

In a reactor equipped with a thermometer, a stirrer, a separation tube and a dropping funnel, 131 g of the above polyhydroxynaphthalene compound was dissolved in 945 g of epichlorohydrin. Next, the mixture was heated to 60 C and 150 g of a 40% aqueous sodium hydroxide solution was continuously added dropwise over 2 hours.

During this period, epichlorohydrin and water were azeotropically liquefied, separated into an organic layer and an aqueous layer by a separation tube, the aqueous layer was removed outside the system, and the organic layer was circulated in the system. After completion of the reaction, unreacted epichlorohydrin was removed by distillation under reduced pressure (150 ° C., 5 mmHg), and the reaction product was dissolved in methyl isobutyl ketone. Next, after removing a by-product salt by filtration, methyl isobutyl ketone was removed by distillation to obtain an epoxy compound. This compound had a softening point of 79 ° C. and an epoxy equivalent of 182. Examples 1 to 4 and Comparative Examples 1 and 2 Compounds having the compositions (parts by weight) shown in Table 1 were mixed with a Henschel mixer, and further melted and kneaded with a hot roll of 100 to 130 C for 3 minutes.

The mixture was cooled, pulverized and tableted to obtain a molding resin composition.

The following raw materials were used in Table 1 except for the synthesis examples.・ Polymaleimide compound (1); bis (4-maleimidophenyl) methane (manufactured by Mitsui Toatsu Chemicals, Inc.) ・ Polymaleimide compound (2); 4,4′-bis (3-maleimidophenoxy) biphenyl (Mitsui Higashi) Pressure Chemical Co., Ltd.
・ Epoxy resin; o-cresol novolak type epoxy resin (EOCN-1020, manufactured by Nippon Kayaku Co., Ltd.) ・ Phenol compound; Novolac type phenol resin (PN-80, manufactured by Nippon Kayaku Co., Ltd.) ・ Inorganic filling Agent: Spherical fused silica (Halimic S-CO, manufactured by Micron Corporation) 50
Parts by weight and amorphous fused silica (Hughes Rex RD-8
A mixture with 50 parts by weight of silane coupling agent (SZ-6083, manufactured by Toray Dow Corning Silicone Co., Ltd.) Transfer molding using the molding resin composition obtained as described above (180 C, 30
kg / cm ² for 3 minutes) to form a test piece for measuring physical properties. After mounting test elements (10 mm x 10 mm square) on the element mounting part of the flat package type semiconductor device lead frame, transfer molding (180 C, 30 kg / cm ² , 3
Min) to obtain a test semiconductor device. These test moldings were post-cured at 180 C for 6 hours before each test. The test results are shown in Table 2.

[0051]

[Table 1]

[0052]

[Table 2]

[0053]

As described in Examples and Comparative Examples, the resin composition according to the present invention can efficiently impart the heat resistance of the imide resin without impairing the water absorption resistance.

Accordingly, when a surface-mount type semiconductor device to which the reflow and flow soldering method is applied is sealed with this resin composition, excellent solder crack resistance is exhibited and a highly reliable resin-sealed semiconductor is obtained. This is an invention which is industrially useful because the device can be obtained.

Continued on the front page (51) Int.Cl. ⁶ Identification code FI H01L 23/31 (C08K 13/02 3:00 5: 3417) (72) Inventor Kotaro Asahina 1190 Kasama-cho, Sakae-ku, Yokohama, Kanagawa Prefecture Mitsui Toatsu Within Chemical Co., Ltd. (72) Inventor Junsuke Tanaka 1190 Kasama-cho, Sakae-ku, Yokohama-shi, Kanagawa Prefecture Mitsui Toatsu Chemicals Inspector Hitoshi Kobayashi (56) References JP-A-2-138330 (JP, A) JP-A Sho 60-237081 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) C08G 59/32 C08G 59/62 C08L 63/00-63/10 C08K 5/3417 H01L 23/29

Claims (9)

(57) [Claims] As claimed in claim 1] (A) component, (a) the general formula (1) [Chemical 1]; ## STR1 ## (Wherein, R ₁ represents an m-valent organic group having at least 2 carbon atoms, and m represents a positive integer of 2 or more . ) And a polymaleimide compound represented by the formula (b): ) [Chemical formula 2] ; (Wherein, n represents an integer of 0 to 5) or an epoxy compound containing 30 to 100% of the compound; and (c) a phenol compound having two or more failing hydroxyl groups. A resin composition comprising an organic component mainly composed of: and an inorganic filler as the component (B). 2. A resin composition for encapsulating a semiconductor substantially comprising the resin composition according to claim 1. 3. The total amount of the components (b) and (c) is 10 to 100 parts by weight of the polymaleimide compound (a).
3. The resin composition according to claim 1, wherein the amount is 500 parts by weight. 4. The composition according to claim 1, wherein the ratio of component (b) to component (c) is such that the ratio of the phenolic hydroxyl group of component (c) to the epoxy group of component (b) is in the range of 0.1 to 10. 3. The resin composition according to 2. 5. The blending amount of the inorganic filler of the component (B) is as follows:
(A) 100 to 90 parts by weight based on 100 parts by weight of the total amount of the organic components.
3. The resin composition according to claim 1, which is 0 parts by weight. 6. The polymaleimide compound of the component (a) is represented by the general formula (3): ## STR3 ## ( Wherein , 1 is an average value of 0 to 10). The resin composition according to claim 1 or 2, comprising a polymaleimide represented by the following formula: 7. The epoxy compound of component (b), wherein 0 to 0
70 wt% of the general formula (4) [Formula 4], (5) [Formula 5] and / or (6) formula 6 include represented by epoxy compounds characterized according to claim 1 or 2, wherein Resin composition. Embedded image (Wherein R ₄ is a hydrogen atom or an alkyl having 1 to 9 carbon atoms)
And p represents an integer of 1 or more. ) (In the formula, x represents an integer of 0 to 5.) (In the formula, x represents an integer of 0 to 5.) 8. The phenol compound of the component (c) is a compound represented by the following general formula (7): (7) , (8) [8] , (9) [9] ,
(10) represented by [Chemical Formula 10] or (11) [Chemical Formula 11]
Aralkyl resin and / or the general formula that (12) [of 1
The resin composition according to claim 1, further comprising a dicyclopentadiene phenol resin represented by the formula (2). Embedded image (Wherein R ₃ is a hydrogen atom, a hydroxyl group or an alkyl group having 1 to 9 carbon atoms)
Represents an alkyl group, and r represents an integer of 1 or more. ) (In the formula, q represents an integer of 0 to 5.) (In the formula, q represents an integer of 0 to 5.) (In the formula, q represents an integer of 0 to 5.) (In the formula, q represents an integer of 0 to 5.) (Wherein R ₂ is a hydrogen atom or an alkyl having 4 or less carbon atoms)
And n represents an integer of 0 to 5. ) 9. An inorganic filler of component (B) comprising crystalline silica,
3. The fused silica, alumina, diatom diatom, diatom diatom, talc, calcium silicate, calcium carbonate, mica, clay, titanium white, glass fiber and carbon fiber. Resin composition.