JP2001064361A - Epoxy resin molding material for sealing and electronic part device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a composition excellent in resistance to soldering heat by using an epoxy resin containing a stilbene-type epoxy resin and a novolak epoxy resin, a curing agent containing a phenol-aralkyl resin, a cure accelerator containing a betaine-type adduct of an amidine compound to p-benzoquinone, and an inorganic filler as essential ingredients. SOLUTION: The epoxy resin contains a stilbene-type epoxy resin of formula I and a novolak epoxy resin of formula If in a wt. ratio of (3/7)-(7/3). The curing agent contains at least 50 wt.% phenol-aralkyl resin of formula III. In the formulas, R1 to R4 are each H or a (substituted) 1-5C monovalent hydrocarbon group; (n) is 0-10; and R is a (substituted) 1-10C monovalent hydrocarbon group. Preferably, the accelerator contains a betaine-type adduct of 1,8- diazabicyclo[5.4.0]undecene-7 or 1,5-diazabicyclo[4.3.0]nonene-5 to p- benzoquinone.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing epoxy resin molding material having excellent solder heat resistance, particularly in a semiconductor device using a copper frame, and an element sealed with the sealing epoxy resin molding material. The present invention relates to an electronic component device provided.

[0002]

2. Description of the Related Art Electronic component devices such as ICs and transistors meet the demand for miniaturization and high-speed operation, and their degree of integration and operation speed are increasing year by year, resulting in an increase in power consumption, that is, an increase in heat generation. Have been. In addition, demands for cost reduction are becoming increasingly severe, and in recent years, in order to meet these demands, an increasing number of cases of using a copper frame having a high thermal conductivity and a low cost in place of a conventional 42 alloy frame for electronic component devices have been increasing. ing. However, the surface of the copper frame is easily oxidized by the heat treatment as compared with the 42 alloy frame, and the generated oxide film is brittle, so that it is easy to peel off the sealing epoxy resin molding material on the back surface of the die pad and the inner lead portion after the element is sealed. There is a problem that the solder heat resistance during mounting is poor. Therefore, in order to improve the adhesion between the copper frame and the sealing epoxy resin molding material, a method of adding an aromatic aminosilane-based coupling agent to the molding material (JP-A-5-25367) is used to form a chelate with copper. A method of adding a compound (JP-A-7-316399) and a method of adding a compound coordinating to copper (JP-A-7-316399)
No. 33860), a method of adding crystalline silica as a filler in order to make the linear expansion coefficient of the sealing material close to that of the copper frame (JP-A-7-273251, JP-A-9-1297)
No. 86) has been proposed.

[0003]

However, these additives or fillers do not sufficiently improve the heat resistance of the solder, and particularly, the heat treatment conditions applied until the element sealing step are severe, and the oxidation of the copper frame proceeds. In this case, there is a problem that the soldering heat resistance is rather lowered. The present invention is also applicable to such an oxidized copper frame.
An object of the present invention is to provide an epoxy resin molding material for sealing having excellent solder heat resistance and excellent moldability, and an electronic component device provided with an element sealed with the epoxy resin molding material.

[0004]

The present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, have found that stilbene-type epoxy resins and novolak-type epoxy resins having special compounding ratios, phenol-aralkyl resins, And by using a special betaine-type curing accelerator in combination,
The inventors have found that the cured product can significantly improve the solder heat resistance, and have completed the present invention.

That is, the present invention comprises (1) an epoxy resin, (B) a curing agent, (C) a curing accelerator, and (D) an inorganic filler as essential components.
The composition contains a stilbene type epoxy resin represented by the following general formula (I) and a novolak type epoxy resin represented by the following general formula (II) in a weight ratio of 3/7 to 7/3,
The component (B) contains 50% by weight or more of a phenol aralkyl resin represented by the following general formula (III) based on the total amount of the curing agent (B), and the component (C) contains an amidine compound and p
An epoxy resin molding material for sealing, characterized by containing a betaine-type adduct with benzoquinone;

Embedded image (Here, R ^{1 to} R ⁴ are selected from hydrogen and a substituted or unsubstituted monovalent hydrocarbon group having 1 to 5 carbon atoms, and may be the same or different. N is an integer of 0 to 10. Shown.)

Embedded image (Here, R is selected from hydrogen and a substituted or unsubstituted monovalent hydrocarbon group having 1 to 10 carbon atoms, and n represents an integer of 0 to 10.)

Embedded image (Here, R is selected from hydrogen and a substituted or unsubstituted monovalent hydrocarbon group having 1 to 10 carbon atoms, and n represents an integer of 0 to 10.) (2) The curing accelerator (C) is 1,8-diaza-bicyclo
[5.4.0] Betaine-type adduct of undecene-7 and p-benzoquinone and / or 1,5-diaza-bicyclo
[4.3.0] The epoxy resin molding material for sealing according to the above (1), which contains a betaine type adduct of nonene-5 and p-benzoquinone, and (3) the content of the inorganic filler (D) Is from 55 to 90% by volume based on the entire epoxy resin molding material, and (4) any of (1) to (3) above. The present invention relates to an electronic component device including an element sealed with a sealing epoxy resin molding material.

[0006]

DETAILED DESCRIPTION OF THE INVENTION (A) used in the present invention
The epoxy resin component is generally used in molding epoxy resin molding compounds and is not particularly limited. At least a stilbene type epoxy resin represented by the following general formula (I) and a stilbene type epoxy resin represented by the following general formula (II) It is necessary to contain the novolak type epoxy resin in a weight ratio of 3/7 to 7/3.

Embedded image (Here, R ^{1 to} R ⁴ are selected from hydrogen and a substituted or unsubstituted monovalent hydrocarbon group having 1 to 5 carbon atoms, and may be the same or different. N is an integer of 0 to 10. Shown.)

Embedded image (Here, R is selected from hydrogen and a substituted or unsubstituted monovalent hydrocarbon group having 1 to 10 carbon atoms, and n represents an integer of 0 to 10.)

In the general formula (I), R ^{1 to} R ^{4 are} as follows:
For example, hydrogen, a methyl group, an ethyl group, a propyl group, a butyl group, an isopropyl group, an alkyl group such as a t-butyl group,
Examples thereof include a substituted or unsubstituted monovalent hydrocarbon group having 1 to 5 carbon atoms such as an alkenyl group such as a vinyl group, an allyl group, and a butenyl group, a halogenated alkyl group, an amino-substituted alkyl group, and a mercapto-substituted alkyl group. In particular, an alkyl group is preferable, and a methyl group and a t-butyl group are more preferable.
Further, n needs to be an integer of 0 to 10, and from the viewpoint of fluidity, the average value of n is preferably 0 to 5, and more preferably 0 to 3. Among them, a resin in which n is 0 as a main component is more preferable. Examples of the stilbene type epoxy resin represented by the general formula (I) used in the present invention include an epoxidized product of 2,2′-dihydroxy-3,3 ′, 5,5′-tetramethylstilbene and 4,4′- Epoxidized product of dihydroxy-3,3 ', 5,5'-tetramethylstilbene, 4,4'-dihydroxy-3,
Epoxidized product of 3 ′, 5,5′-tetramethyl-α-methylstilbene, 4,4′-dihydroxy-3,3′-
Epoxidized di-t-butyl-5,5'-dimethylstilbene, 4,4-dihydroxy-3,3'-di-t-
Epoxidized product of butyl-6,6'-dimethylstilbene, epoxidized product of 2,2'-dihydroxy-3,3'-di-t-butyl-6,6'-dimethylstilbene, 3
-T-butyl-4,4'-dihydroxy-3 ', 5
Epoxidized 5'-trimethylstilbene, 3-t-
Epoxidized butyl-2,4'-dihydroxy-3 ', 5', 6-trimethylstilbene, 3-tert-butyl-
Epoxidized products of 4,4′-dihydroxy-3 ′, 5 ′, 6-trimethylstilbene and the like may be used, and these may be used alone or in combination of two or more. Among these, from the viewpoint of the softening point of the resin, 3-t-butyl-4,4 ′
Epoxidized product of -dihydroxy-3 ', 5,5'-trimethylstilbene, 4,4'-dihydroxy-3,
Epoxidized 3 ', 5,5'-tetramethylstilbene, and mixtures thereof are preferred, and 3-t-butyl-
Epoxidized 4,4'-dihydroxy-3 ', 5,5'-trimethylstilbene and 4,4'-dihydroxy-
More preferred is a mixture of epoxidized 3,3 ', 5,5'-tetramethylstilbene.

R in the above general formula (II) is, for example, hydrogen, an alkyl group such as a methyl group, an ethyl group, a propyl group, a butyl group, an isopropyl group, a t-butyl group, a vinyl group, an allyl group, a butenyl. Alkenyl group such as a group, a halogenated alkyl group, an amino group-substituted alkyl group, a substituted or unsubstituted monovalent hydrocarbon group having 1 to 10 carbon atoms such as a mercapto group-substituted alkyl group, among which a methyl group,
An alkyl group such as an ethyl group is preferred, and a methyl group is more preferred. Examples of the novolak type epoxy resin represented by the general formula (II) used in the present invention include a phenol novolak type epoxy resin and an orthocresol novolak type epoxy resin, and among them, an orthocresol novolak type epoxy resin is preferable. In addition, the above general formula (I
The viscosity of the novolak type epoxy resin represented by I) is not particularly limited, but the ICI viscosity at 150 ° C. is 0.5 to
It is preferably 5 poise, more preferably 0.6 to 3 poise. If it is less than 0.5 poise, the pot life tends to decrease. If it exceeds 5 poise, fluidity and solder heat resistance tend to decrease.

The amounts of the stilbene type epoxy resin represented by the above general formula (I) and the novolak type epoxy resin represented by the above general formula (II) are set so as to achieve excellent solder heat resistance. ) The total amount of both is preferably at least 60 wt%, more preferably at least 70 wt%, even more preferably at least 80 wt% based on the total amount. The mixing ratio of the stilbene type epoxy resin represented by the general formula (I) and the novolak type epoxy resin represented by the general formula (II) is determined by the weight ratio (I) from the viewpoint of solder heat resistance.
/ (II) needs to be set to 3/7 to 7/3,
4/6 to 6/4 is more preferable, and 5/5 to 6/4 is further preferable. When the proportion of the stilbene type epoxy resin represented by the general formula (I) increases, the moldability tends to decrease, and when the proportion of the novolak type epoxy resin represented by the general formula (II) increases, the solder heat resistance tends to decrease. It is.
The stilbene type epoxy resin represented by the general formula (I) and the novolak type epoxy resin represented by the general formula (II) may be blended with other components at the time of preparing the sealing epoxy resin molding material. However, it is preferable to use a mixture of the two in advance.

[0010] The component (A) of the epoxy resin molding material of the present invention includes, in addition to the stilbene type epoxy resin represented by the general formula (I) and the novolak type epoxy resin represented by the general formula (II), a sealing An epoxy resin generally used for an epoxy resin molding material for stopping can be used in combination. Examples of the epoxy resin used in combination include bisphenol A type epoxy resin, bisphenol S type epoxy resin, biphenyl type epoxy resin which is an epoxidized product of substituted or unsubstituted biphenols, and epoxidized product of polyamine such as diaminodiphenylmethane, isocyanuric acid. Glycidylamine-type epoxy resin, dicyclopentadiene-type epoxy resin which is an epoxidized resin of dicyclopentadiene and phenols, naphthol novolak-type epoxy resin which is an epoxidized resin of naphthols and aldehydes, Trimethylolpropane epoxy resin, terpene-modified epoxy resin,
Examples include phenyl sulfide type epoxy resin, linear aliphatic epoxy resin obtained by oxidizing olefin bond with a peracid such as peracetic acid, and alicyclic epoxy resin. Resins are preferred. These epoxy resins can be used alone or in combination of two or more kinds with the stilbene type epoxy resin represented by the general formula (I) and the novolak type epoxy resin represented by the general formula (II).

The curing agent of the component (B) used in the present invention is generally used in epoxy resin molding materials for encapsulation and is not particularly limited, but at least a phenolic compound represented by the following general formula (III): It is necessary that the aralkyl resin contains 50% by weight or more based on the total amount of the curing agent (B).

Embedded image (Here, R is selected from hydrogen and a substituted or unsubstituted monovalent hydrocarbon group having 1 to 10 carbon atoms, and n represents an integer of 0 to 10.) A phenol represented by the above general formula (III)・
Among aralkyl resins, R is hydrogen and the average value of n is 0.
Phenol-aralkyl resins of from 8 to 8 are preferable, and specific examples thereof include p-xylylene-type ziloc and m-xylylene-type ziloc.

The viscosity of the phenol-aralkyl resin represented by the general formula (III) is not particularly limited, but from the viewpoint of fluidity, the ICI viscosity at 150 ° C. is preferably 4 poise or less, more preferably 2 poise or less. preferable. The blending amount of the phenol-aralkyl resin represented by the general formula (III) is 50% by weight based on the total amount of the curing agent (B) from the viewpoint of fluidity, curability, and solder heat resistance.
It is necessary to be at least 60% by weight, and more preferably at least 70% by weight.

The component (B) of the epoxy resin molding compound for sealing of the present invention includes, in addition to the phenol-aralkyl resin represented by the above general formula (III), other components commonly used in epoxy resin molding compounds for sealing. Can be used in combination. Examples of the curing agent used in combination include a phenol compound, an acid anhydride, and an amine compound, and among them, a phenol compound is preferable. Examples of the phenol compound include phenols such as phenol, cresol, xylenol, hydroquinone, resorcin, catechol, bisphenol A, bisphenol F, and / or the like.
Or a naphthol such as α-naphthol, β-naphthol, dihydroxynaphthalene and a aldehyde such as formaldehyde, acetaldehyde, propionaldehyde, benzaldehyde, and salicylaldehyde are condensed or co-condensed with an aldehyde such as a novolak-type phenol resin or Novolak-type naphthol resin, naphthol-aralkyl resin obtained by reacting naphthols with dimethoxyparaxylene, etc., dicyclopentadiene-type phenol resin obtained by co-condensing dicyclopentadiene and phenols, melamine-modified phenol resin, terpene Modified phenolic resins, polycyclic aromatic modified phenolic resins and the like can be mentioned. These curing agents can be used alone or in combination of two or more kinds with the phenol-aralkyl resin represented by the above general formula (III).

In the present invention, the mixing ratio of the epoxy resin (A) to the curing agent of the component (B) is such that the ratio of the hydroxyl equivalent of the entire curing agent to the epoxy equivalent of the entire epoxy resin is in the range of 0.5 to 2. It is preferably set, more preferably 0.7 to 1.5, further preferably 0.8 to
1.3. If this ratio is less than 0.5, the curing of the epoxy resin becomes insufficient, and the heat resistance, moisture resistance and electric properties of the cured product are likely to be inferior. On the other hand, if the ratio exceeds 2, the phenolic resin component becomes excessive and a large amount of phenolic hydroxyl groups remain in the cured product, so that the electrical properties and moisture resistance tend to decrease.

The curing accelerator of the component (C) used in the present invention is not particularly limited as long as it is generally used in an epoxy resin molding compound for encapsulation. At least betaine of an amidine compound and p-benzoquinone is used. It is necessary to contain a mold adduct. The amount of the betaine-type adduct of the amidine compound and p-benzoquinone is preferably 30% by weight or more, more preferably 50% by weight or more based on the total amount of the curing accelerator (C) from the viewpoint of fluidity and solder heat resistance. . The total amount of the curing accelerator (C) is
The amount is not particularly limited as long as the curing acceleration effect is achieved, but 0.1 to 10 parts by weight based on 100 parts by weight of the total amount of the epoxy resin (A) and the curing agent (B). And more preferably 0.3 to 5 parts by weight. If the amount is less than 0.1 part by weight, the curability in a short time tends to be inferior. If the amount exceeds 10 parts by weight, the curing rate tends to be too fast to obtain a good molded product.

Examples of the amidine compound used as a raw material for the betaine-type adduct of the amidine compound and p-benzoquinone in the component (C) include, for example, 1,8-diazabicyclo [5.4.0] undecene-7,1. , 5-Diazabicyclo [4.3.0] nonene-5,6-dibutylamino-
1,8-diazabicyclo [5.4.0] undecene-7,
6-n-hexyl-1,8-diazabicyclo [5.4.
0] undecene-7,7-methyl-1,5,7-triazabicyclo [4.4.0] decene-5, imidazole, 2-
Methylimidazole, 4-methylimidazole, 2-ethyl-4-methylimidazole, 2-undecylimidazole, 2-heptadecylimidazole, 2-phenylimidazole, 1-benzyl-2-methylimidazole, 1-cyanoethyl-2-methyl Imidazole, 1-
Cyanoethyl-2-ethyl-4-methylimidazole,
1-cyanoethyl-2-undecylimidazole, 2-
Phenyl-4-methylimidazole, 1-cyanoethyl-2-phenylimidazole, 1-cyanoethyl-2-
Ethyl-4-methylimidazole, 2-phenyl-4-
Methyl-5-hydroxymethylimidazole, 2-phenyl-4,5-dihydroxymethylimidazole, 1-
And cyanoethyl-2-phenyl-4,5-di (cyanoethoxymethyl) imidazole. These can be used alone or in combination of two or more. Among them, 1,8-diazabicyclo [5.4.0] undecene-7 and 1,5-diazabicyclo [4.3.0] nonene-5 in terms of availability, cost, and reliability of electronic components.
Is preferred. These betaine-type adducts of amidine compounds and p-benzoquinone may be used alone or in combination of two or more.

The epoxy resin molding material of the present invention requires, in addition to the above-mentioned betaine-type adduct of the amidine compound and p-benzoquinone, a curing accelerator generally used in epoxy resin molding materials for sealing. They can be used in combination depending on the situation. Examples of the curing accelerator used in combination include, for example, 1,8-
Diaza-bicyclo [5.4.0] undecene-7,1,
5-diaza-bicyclo [4.3.0] nonene-5,6-
Dibutylamino-1,8-diaza-bicyclo [5.4.
0] Cycloamidine compounds such as undecene-7 and compounds having an intramolecular polarization obtained by adding a compound having a π bond such as maleic anhydride and diazophenylmethane to these compounds, triethylenediamine, benzyldimethylamine, triethanol Tertiary amines such as amine, dimethylaminoethanol, tris (dimethylaminomethyl) phenol and derivatives thereof, 2-methylimidazole, 2-phenylimidazole, 2-phenyl-4-methylimidazole, 2-heptadecylimidazole, etc. Organic phosphines such as imidazoles and derivatives thereof, tributylphosphine, methyldiphenylphosphine, triphenylphosphine, diphenylphosphine, and phenylphosphine; and maleic anhydride, benzoic acid and phosphines. Phosphorus compounds having an intramolecular polarization obtained by adding a compound having a π bond such as non- or diazophenylmethane, tetraphenylphosphonium / tetraphenylborate, tetraphenylphosphonium / ethyltriphenylborate, tetrabutylphosphonium / tetrabutylborate, etc. Tetra-substituted phosphonium tetra-substituted borate, 2-ethyl-4-methylimidazole
Examples thereof include tetraphenylboron salts such as tetraphenylborate and N-methylmorpholine / tetraphenylborate, and derivatives thereof. These curing accelerators can be used alone or in combination of two or more kinds with the above-mentioned betaine-type adduct of an amidine compound and p-benzoquinone.

As the inorganic filler of the component (D) used in the present invention, for example, fused silica, crystalline silica,
Fine powder of glass, alumina, calcium carbonate, zirconium silicate, calcium silicate, silicon nitride, aluminum nitride, boron nitride, beryllia, zirconia, zircon, fosterite, steatite, spinel, mullite, titania, talc, clay, mica, etc. Not yet, or spherical and hollow spheres of these, and the like.Besides, as an inorganic filler having a flame-retardant effect, aluminum hydroxide,
Examples include magnesium hydroxide and zinc borate. One of these may be used alone, or two or more may be used in combination. Among them, fused silica is preferred from the viewpoint of reducing the coefficient of linear expansion, and alumina is preferred from the viewpoint of high thermal conductivity.

The mixing amount of the inorganic filler (D) is 55 to 90% by volume based on the whole epoxy resin molding material for sealing.
Is preferable, and 70 to 82% by volume is more preferable. The inorganic filler is added for the purpose of improving the thermal expansion coefficient, the thermal conductivity, the elastic modulus, etc. of the cured product, and the blending amount is 55% by volume.
If the amount is less than the above, these properties tend to be inferior. If the amount exceeds 90% by volume, the viscosity of the sealing epoxy resin molding material increases, the fluidity decreases, and the molding tends to be difficult. The average particle size of the inorganic filler (D) is preferably in the range of 1 to 50 μm, more preferably 10 to 30 μm. Average particle size is 1μ
If it is less than m, the viscosity of the epoxy resin molding material for sealing tends to increase, and if it exceeds 50 μm, the resin component and the filler tend to separate, and the cured product becomes non-uniform or the characteristics of the cured product vary, Furthermore, there is a tendency that the filling property into a narrow gap is inferior. The particle shape of the inorganic filler (D) is preferably spherical rather than square from the viewpoint of fluidity, and preferably has a wide particle size distribution. For example, when 75% by volume or more of an inorganic filler is blended, 70% by weight or more of the particles are preferably spherical particles and are preferably distributed over a wide range of 0.1 to 80 μm. Such an inorganic filler tends to have a close-packed structure, so that even if the amount is increased, the increase in the viscosity of the material is small, and an epoxy resin molding material for sealing excellent in fluidity can be obtained.

It is preferable to add an anion exchanger to the sealing epoxy resin molding material of the present invention from the viewpoint of improving the moisture resistance of an electronic component device having an element to be sealed. The moisture resistance to be considered here refers to the reliability of moisture resistance of electronic component devices such as IC packages, and in particular, bias type high temperature and high humidity test, HAST (Highly Accelerated Humidit).
y and Stress Test). Most of the failure modes generated in these moisture resistance tests are disconnections due to corrosion of aluminum wiring formed on IC elements, but the epoxy resin of the component (A) and the curing agent of the component (B) of the present invention. Good moisture resistance reliability can be obtained by using a sealing epoxy resin molding material composed of a combination of a curing accelerator of component (C) and an inorganic filler of component (D). However, the addition of an anion exchanger is effective for obtaining more excellent voltage application type moisture resistance. In the case of a moisture resistance test under the application of a voltage, the aluminum wiring on the anode side is particularly easily corroded. When water is present, the wiring or bonding pad on the anode side is subjected to anodic oxidation by oxygen generated by the electrolysis of water, and a stable aluminum oxide film is formed on the surface, so that aluminum corrosion should not proceed. However, the presence of a small amount of halogen ions such as chlorine solubilizes the aluminum oxide film, resulting in pitting corrosion in which the underlying aluminum is dissolved. Since the pitting corrosion on the anode side progresses faster than the grain boundary corrosion on the cathode side, in the voltage application type moisture resistance test, the corrosion of the aluminum wiring on the anode side proceeds first and becomes defective. Therefore, in order to prevent corrosion on the anode side, it is effective to add an anion exchanger capable of capturing a trace amount of halogen ions.

The anion exchanger that can be used in the present invention is not particularly limited. For example, the following formula (VI)
Hydrotalcites represented by

Embedded image Mg _{1 -X} Al _X (OH) ₂ (CO ₃ ) _{X / 2} · mH ₂ O (VI) (0 <x ≦ 0.5, m is a positive integer) Magnesium, aluminum, titanium ,zirconium,
And a hydrated oxide or hydroxide of an element selected from bismuth and bismuth. These may be used alone or in combination of two or more.

Hydrotalcites are trapped by replacing an anion such as a halogen ion with CO ₃ in the structure, and the halogen ion incorporated in the crystal structure is about 3
It is a compound that has the property of not desorbing at 50 ° C. or higher until the crystal structure is broken. Hydrotalcites having such properties include Mg ₆ Al produced as a natural product.
_{2 (OH) 16 CO 3 ·} 4H 2 Mg 4 as O or synthetic _{products. 3} Al
_{2 (OH) 12. 6 CO} 3 · mH 2 O are mentioned. Further, in the epoxy resin molding material for sealing of the present invention, an extract of a cured product using pure water shows an acidic value of 3 to 5 due to the effect of the curing agent of the component (B). Therefore, although the environment is susceptible to corrosion for aluminum, which is an amphoteric metal, hydrotalcites also have the effect of adsorbing acids, and therefore have the effect of bringing the extract closer to neutrality. It can be inferred that the addition of sites is a factor that works effectively to prevent aluminum corrosion. Magnesium, aluminum, titanium, zirconium, and hydrated oxides or hydroxides of elements selected from bismuth can also be captured by replacing halogen ions with hydroxide ions, and further these ion exchangers are excellent on the acidic side Shows ion exchange capacity. As for the epoxy resin molding material for sealing of the present invention, since the extract is on the acidic side as described above, these hydrated oxides or hydroxides are also effective for preventing aluminum corrosion.

The amount of these anion exchangers is not particularly limited as long as it is a sufficient amount to capture anions such as halogen ions. 0.1 to 30 parts by weight, more preferably 1 to 5 parts by weight.

The sealing epoxy resin molding material of the present invention may contain epoxy silane, mercapto silane, amino silane, alkyl silane, or the like as a coupling agent for enhancing the adhesion between the resin component and the inorganic filler, if necessary. Known additives such as silane compounds such as ureidosilane and vinylsilane, titanium compounds, aluminum chelates, and aluminum / zirconium compounds can be used. In addition to the coupling agent, an adhesion promoter may be used, if necessary, to improve the adhesion between the copper frame and the sealing epoxy resin molding material. As the adhesion promoter, for example, imidazole, triazole, tetrazole, triazine and the like and derivatives thereof, anthranilic acid, gallic acid, malonic acid, malic acid,
Examples thereof include maleic acid, aminophenol, quinoline, and derivatives thereof, aliphatic acid amide compounds, dithiocarbamates, and thiadiazole derivatives. These may be used alone or in combination of two or more. In addition, known compounds such as carbon black, organic dyes, organic pigments, titanium oxide, lead red, and red iron oxide may be used as the colorant.

The molding epoxy resin molding material of the present invention may be added with a mold release agent in order to impart good mold releasability to the mold during molding. As the release agent, it is preferable to add 0.01 to 10 parts by weight of an oxidized or non-oxidized polyolefin to 100 parts by weight of the epoxy resin (A), and more preferably 0.1 to 10 parts by weight. -5 parts by weight. If the amount is less than 0.01 part by weight, the releasability tends to decrease, and if it exceeds 10 parts by weight, the adhesiveness tends to be poor. Examples of the oxidized or non-oxidized polyolefin include low molecular weight polyethylene having a number average molecular weight of about 500 to 10,000 such as H4, PE, and PED series manufactured by Hoechst Corporation. The above may be used in combination. Other release agents include, for example, carnauba wax, montanic acid ester, montanic acid, stearic acid and the like. These may be used alone or in combination of two or more. When these other release agents are used in combination with an oxidized or non-oxidized polyolefin, the mixing ratio of the other release agents is 10%.
Usually 0.1 parts by weight per 0 parts by weight. 1 to 10 parts by weight are preferred,
More preferably, it is 0.5 to 3 parts by weight.

The epoxy resin molding material for sealing of the present invention may contain a flame retardant for imparting flame retardancy to the electronic component device. Examples of the flame retardant include known organic or inorganic compounds containing a halogen atom, an antimony atom, a nitrogen atom or a phosphorus atom, and metal hydroxides. These may be used alone or in combination of two or more. Is also good. Among them,
Brominated epoxy resins, antimony trioxide and the like are preferred.
The compounding amount of these flame retardants is preferably 1 to 30 parts by weight, more preferably 2 to 15 parts by weight, based on 100 parts by weight of the epoxy resin (A). Further, as other additives, a stress relieving agent such as silicone oil or silicone rubber powder can be blended as required.

The sealing epoxy resin molding material of the present invention comprises:
As long as the various components can be uniformly dispersed and mixed, it can be prepared by any method.However, as a general method, after sufficiently mixing a predetermined amount of components with a mixer or the like, a mixing roll, an extruder or the like is used. After melt-kneading, a method of cooling and pulverizing can be exemplified. For example, it can be obtained by a method of uniformly stirring and mixing a predetermined amount of the above-mentioned components, kneading with a kneader, a roll, an extruder or the like which has been heated to 70 to 140 ° C., cooling, and pulverizing. It is easy to use if it is tableted with dimensions and weight that match the conditions of use.

As an electronic component device obtained by sealing an element with the sealing epoxy resin molding material obtained by the present invention, a semiconductor element is fixed on a lead frame, and a terminal portion (bonding pad etc.) of the element is formed. A typical resin-encapsulated IC package obtained by connecting the lead portions by wire bonding, bumps, or the like, and then sealing it by a transfer molding method using an epoxy resin molding material for sealing is used. For example, DIP (Dual Inline Packag)
e), PLCC (Plastic Leaded Chip Carrier), QF
P (Quad Flat Package), SOP (Small Outline Pac)
kage), SOJ (Small Outline J-lead package), T
SOP (Thin Small Outline Package), TQFP (Th
in Quad Flat Package). In particular, when applied to an electronic component device mounted on a wiring board by a surface mounting method, the epoxy resin molding material for sealing of the present invention can exhibit excellent reliability. Also, if it is in the form of a resin-sealed package having the above-described leads (external connection terminals),
The element to be sealed is a transistor, thyristor, IC, L
Not only semiconductor elements such as SI and diodes, but also resistors, resistor arrays, capacitors, switches such as polyswitches, etc., the epoxy resin molding material for encapsulation of the present invention is superior to these elements. In addition to providing reliability, it is possible to obtain excellent reliability for a hybrid IC in which various elements and electronic components are mounted on a ceramic substrate and then entirely sealed. Furthermore, after mounting the element on the surface of the organic substrate having terminals for wiring board connection formed on the back surface, connecting the element and the wiring formed on the organic substrate by bump or wire bonding, an epoxy resin molding material for sealing is used. B obtained by sealing the element using
GA (Ball Grid Array) and CSP (Chip Size Packag)
Excellent reliability can also be obtained for electronic component devices such as e). The epoxy resin molding material for encapsulation of the present invention can be effectively used for the production of printed circuit boards and the like. As a method for sealing an electronic component device using the sealing epoxy resin molding material obtained in the present invention, a low-pressure transfer molding method is most common, but an injection molding method,
A compression molding method or the like may be used.

[0029]

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

Examples 1 to 6, Comparative Examples 1 to 9 Epoxy equivalents 206, melting point 134
° C stilbene type epoxy resin (trade name LVX-210 manufactured by Sumitomo Chemical Co., Ltd.), epoxy equivalent 196, orthocresol novolak epoxy resin having a softening point of 65 ° C (trade name ESCN-190 manufactured by Sumitomo Chemical Co., Ltd.),
And epoxy equivalent 393, softening point 80 ° C, bromine content 4
8% by weight of a bisphenol A type brominated epoxy resin, a phenol aralkyl resin having a softening point of 70 ° C. and a phenol aralkyl resin (trade name: MILEX XL-225 manufactured by Mitsui Chemicals, Inc.) having a hydroxyl equivalent of 176, and a hydroxyl equivalent of 106
A phenol novolak resin having a softening point of 64 ° C. (trade name: H-4 manufactured by Meiwa Kasei Co., Ltd.) was used, and 1,8-diazabicyclo [5.4.0] undecene-7 was used as a curing accelerator.
(DBU), a betaine-type adduct of DBU and p-benzoquinone (DBU-BQ), a phenol novolak salt of DBU (trade name SA-841 manufactured by San Apro Co.),
1,5-diazabicyclo [4.3.0] nonene-5 (DB
N), and a betaine-type adduct of DBN and p-benzoquinone (DBN-BQ), fused silica powder as an inorganic filler, and a coupling agent γ-glycidoxypropyltriene as another additive component. Using methoxysilane, carnauba wax, antimony trioxide, and carbon black in a weight ratio shown in Table 1, a kneading temperature of 8
Roll kneading was performed under the conditions of 0 to 90 ° C. and a kneading time of 15 minutes to obtain the sealing epoxy resin molding materials of Examples 1 to 6 and Comparative Examples 1 to 9.

[0031]

[Table 1]

The epoxy resin molding materials for sealing obtained in Examples and Comparative Examples were subjected to the following various property tests (1) to (4). Table 2 shows the results. (1) Spiral flow 180 ° C., 7 MPa, 90 according to EEMI1-66
The flow length (in inches) when molded under the condition of seconds was measured. (2) Hot Hardness (Shore D) The Shore D hardness of a test piece (50 mmφ × 3 mmt) formed under the conditions of 180 ° C., 7 MPa, and 90 seconds was measured. (3) Hot hardness at the time of moisture absorption (Shore D) The hot hardness was measured in the same manner as in the above (2) using the sealing epoxy resin molding material left for 72 hours at 25 ° C./50% RH. (4) Solder heat resistance A test silicon chip having a size of 8 × 10 × 0.4 mm was fixed on a copper frame using a silver paste, and baked at 200 ° C. for 2 hours in an air atmosphere to cure the silver paste. Wire bonding was performed under heating conditions of 230 ° C./40 seconds. Then, using a copper frame to which this silicon chip is fixed, a package of 80 pins of QFP having an outer size of 14 × 20 × 2.0 mm is mounted at 180 ° C., 7 MPa, and 9 MPa.
Molding was performed under the condition of 0 second, and post-curing was performed at 175 ° C. for 6 hours. The package is allowed to absorb moisture at 85 ° C. and 85% RH for a predetermined period of time (48 h, 72 h, 96 h), subjected to reflow treatment at 215 ° C. for 90 seconds by a vapor phase reflow device, and observed for the occurrence of cracks.
The number of crack occurrence packages with respect to the number of test packages was examined to evaluate solder heat resistance.

[0033]

[Table 2]

Whether any one of the stilbene type epoxy resin and the novolak type epoxy resin of the present invention is not blended,
Alternatively, in Comparative Examples 1 to 4, which do not satisfy the specified weight ratio of the present invention even if both are included, good solder heat resistance was not obtained. In addition, although both epoxy resins are included in a specified weight ratio,
Comparative Examples 5 and 8 in which the blending amount of the phenol-aralkyl resin of the present invention is smaller than the specified amount of the present invention, and Comparative Examples 6, Comparative Examples 7 and 9, which do not contain the betaine-type adduct of the present invention, The solder heat resistance was poor. On the other hand, the stilbene type epoxy resin and the novolak type epoxy resin of the present invention are blended in a weight ratio of 7/3 to 3/7, and 50% by weight or more of the phenol / aralkyl resin of the present invention based on the total amount of the curing agent. , And Examples 1 to 6 containing the betaine-type adduct of the present invention all showed good solder heat resistance. Examples 2, 3, and 6, in which the weight ratio of stilbene type epoxy resin / novolak epoxy resin epoxy resin was 5/5 to 6/4, showed particularly excellent solder heat resistance. In addition, the fluidity, the hardness at the time of heating, and the hardness at the time of moisture absorption also showed good characteristics in the examples.

[0035]

The sealing epoxy resin molding material according to the present invention exhibits good properties in terms of fluidity, hardness at heating and hardness at heating when absorbed, and is particularly applied to an electronic component device using a copper frame. In this case, as shown in the embodiment, 200 to 2
It exhibits excellent solder heat resistance even under severe heat treatment conditions of 30 ° C., and a highly reliable electronic component device can be obtained even when the oxidation of the copper frame is advanced, and its industrial value is great. .

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Seiichi Akagi 48 Wadai, Tsukuba, Ibaraki Prefecture F-term in Hitachi Chemical Co., Ltd. Research Laboratory 4J036 AA05 AD01 AD07 AD10 AF06 AF08 DB06 DB15 DC02 DC41 DC46 DD07 FA01 FA05 FA10 FB02 FB06 GA23 GA28 JA07 4M109 AA01 BA01 CA21 EA06 EB03 EB04 EB06 EB07 EB08 EB09 EB12 EB13 EB18 EB19 EC05 EC20

Claims (4)

[Claims] (1) an epoxy resin, (B) a curing agent,
(C) A curing accelerator and (D) an inorganic filler are essential components, and a stilbene type epoxy resin represented by the following general formula (I) and a novolak type resin represented by the following general formula (II) are contained in the component (A). The epoxy resin is contained in a weight ratio of 3/7 to 7/3, and 50% by weight or more of the phenol represented by the following general formula (III) in the component (B) with respect to the total amount of the curing agent (B).
An epoxy resin molding material for sealing, comprising an aralkyl resin and a betaine-type adduct of an amidine compound and p-benzoquinone in the component (C). Embedded image (Here, R ^{1 to} R ⁴ are selected from hydrogen and a substituted or unsubstituted monovalent hydrocarbon group having 1 to 5 carbon atoms, and may be the same or different. N is an integer of 0 to 10. Shown below.) (Here, R is selected from hydrogen and a substituted or unsubstituted monovalent hydrocarbon group having 1 to 10 carbon atoms, and n represents an integer of 0 to 10.) (Here, R is selected from hydrogen and a substituted or unsubstituted monovalent hydrocarbon group having 1 to 10 carbon atoms, and n represents an integer of 0 to 10.) 2. A curing accelerator (C) wherein a betaine-type adduct of 1,8-diaza-bicyclo [5.4.0] undecene-7 and p-benzoquinone and / or 1,5-diaza-bicyclo [ 4.3.0] The epoxy resin molding material for sealing according to claim 1, which contains a betaine-type adduct of nonene-5 and p-benzoquinone. 3. The content of the inorganic filler (D) is 55 to 90% by volume based on the whole epoxy resin molding material.
Or the epoxy resin molding material for sealing according to claim 2. 4. An electronic component device comprising an element sealed with the epoxy resin molding material for sealing according to claim 1.