JP2016113564A - Resin composition for encapsulation, semiconductor device, and structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin composition for encapsulation, with which a semiconductor device showing a superior balance in an appearance and high-temperature storage characteristics can be achieved.SOLUTION: The resin composition for encapsulation of the present invention comprises an epoxy resin (A), an inorganic filler (B), a curing agent (C), a colorant (D), and an antioxidant (E). The antioxidant (E) comprises one or more compounds selected from a hindered phenolic compound having two or more hindered phenol groups in one molecule, a hindered amine compound and a thioether compound.SELECTED DRAWING: None

Description

  The present invention relates to a sealing resin composition, a semiconductor device, and a structure.

  The semiconductor device is formed, for example, by sealing and molding a semiconductor element mounted on a substrate using a sealing resin composition. As such a sealing resin composition, for example, a resin composition containing an epoxy resin is used.

  Patent Document 1 (Japanese Patent Application Laid-Open No. 2011-89096) describes a technique related to a sealing resin composition containing an epoxy resin, a curing agent, and a colorant as essential components.

JP 2011-89096 A

According to the study by the present inventors, in a conventional sealing resin composition, when a colorant other than black is added, when sealing a semiconductor element or when reflowing the obtained semiconductor device, It has been clarified that the sealing material formed by the sealing resin composition is oxidized to change its color and the appearance of the semiconductor device may be deteriorated.
Further, according to the study by the present inventors, it has been clarified that a semiconductor device using a sealing material having such a large color change is inferior in high-temperature storage characteristics.

According to the present invention,
A sealing resin composition comprising an epoxy resin (A), an inorganic filler (B), a curing agent (C), a colorant (D), and an antioxidant (E),
Sealing resin in which the antioxidant (E) contains one or more selected from hindered phenol compounds, hindered amine compounds and thioether compounds having two or more hindered phenol groups in one molecule A composition is provided.

Moreover, according to the present invention,
A substrate;
A semiconductor element mounted on one surface of the substrate;
A sealing material that is composed of a cured product of the sealing resin composition and seals the semiconductor element and the one surface of the base material;
A semiconductor device is provided.

Moreover, according to the present invention,
A substrate;
A plurality of semiconductor elements mounted on one surface of the substrate;
A sealing material configured by a cured product of the sealing resin composition and sealing the plurality of semiconductor elements and the one surface of the base material;
A structure is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the resin composition for sealing which can implement | achieve the semiconductor device excellent in the balance of an external appearance and a high temperature storage characteristic can be provided.

It is sectional drawing which shows an example of the semiconductor device which concerns on this embodiment. It is sectional drawing which shows an example of the structure which concerns on this embodiment.

  Hereinafter, embodiments will be described with reference to the drawings. In all the drawings, the same reference numerals are given to the same components, and the description will be omitted as appropriate. Moreover, the figure is a schematic diagram and does not necessarily match the actual dimensional ratio. Also, “A to B” in the numerical range represents “A or more and B or less” unless otherwise specified.

  The sealing resin composition according to this embodiment includes an epoxy resin (A), an inorganic filler (B), a curing agent (C), a colorant (D), an antioxidant (E), including. And antioxidant (E) contains the 1 type (s) or 2 or more types selected from the hindered phenol type compound, hindered amine type compound, and thioether type compound which have 2 or more of hindered phenol groups in 1 molecule.

The present inventor is a kind selected from a hindered phenol compound, a hindered amine compound and a thioether compound in which the sealing resin composition has two or more hindered phenol groups in one molecule as an antioxidant (E). Or when it included 2 or more types, it discovered newly that the oxidative degradation of each component in the resin composition for sealing containing a coloring agent (D) can be suppressed effectively.
In this embodiment, each component in the resin composition for sealing containing a coloring agent is made to contain a specific compound as antioxidant (E) in the resin composition for sealing containing a coloring agent (D). It is possible to realize a sealing resin composition in which the oxidation deterioration of the resin is suppressed and the color change is small. Thereby, a semiconductor device having an excellent balance between appearance and high-temperature storage characteristics can be realized.

  Hereinafter, the sealing resin composition, the semiconductor device 100, and the structure 102 according to the present embodiment will be described in detail.

First, the sealing resin composition will be described.
The encapsulating resin composition is used to form an encapsulant that encapsulates a semiconductor element mounted on a substrate. The sealing molding using the sealing resin composition is not particularly limited, and can be performed by, for example, a transfer molding method or a compression molding method.
The sealing resin composition is, for example, a tablet or a granular material. When the sealing resin composition is in the form of a tablet, for example, the sealing resin composition can be molded using a transfer molding method. Moreover, when the resin composition for sealing is a granular material, the resin composition for sealing can be shape | molded using the compression molding method, for example. That the resin composition for sealing is a granular material refers to the case where it is either powdery or granular.
The base material is, for example, a wiring board such as an interposer or a lead frame. The semiconductor element is electrically connected to the base material by wire bonding or flip chip connection.

A semiconductor device obtained by sealing a semiconductor element by sealing molding using a sealing resin composition is not particularly limited. For example, QFP (Quad Flat Package), SOP (Small Outline Package), BGA (BGA) Ball Grid Array), CSP (Chip Size Package), QFN (Quad Flat Non-Leaded Package), SON (Small Outline Non-Leaded Package), LF-BGA (Lead Frame BGA) and the like.
The sealing resin composition according to the present embodiment can also be applied to a structure formed by MAP (Mold Array Package) molding, which is often applied to molding of these packages in recent years. In this case, the said structure is obtained by sealing the several semiconductor element mounted on a base material collectively using the resin composition for sealing.

  Examples of the semiconductor element include, but are not limited to, an integrated circuit, a large-scale integrated circuit, a transistor, a thyristor, a diode, and a solid-state imaging element. The semiconductor element to be encapsulated by the encapsulating resin composition according to the present embodiment is a so-called element that does not involve light input / output, excluding optical semiconductor elements such as a light receiving element and a light emitting element (such as a light emitting diode). Say.

  The sealing resin composition includes an epoxy resin (A), an inorganic filler (B), a curing agent (C), a colorant (D), and an antioxidant (E). And antioxidant (E) contains the 1 type (s) or 2 or more types selected from the hindered phenol type compound, hindered amine type compound, and thioether type compound which have 2 or more of hindered phenol groups in 1 molecule. Thereby, the resin composition for sealing which can obtain the semiconductor device excellent in the balance of an external appearance and a high temperature storage characteristic is realizable.

It is preferable that the sealing material formed with the sealing resin composition according to the present embodiment is colored in a color other than black. Specifically, using a low-pressure transfer molding machine, the above resin composition for sealing was transfer molded to a mold under the conditions of a mold temperature of 175 ° C., an injection pressure of 9.8 MPa, and a curing time of 300 seconds, and the diameter was 50 mm. When a cured product of the sealing resin composition having a thickness of 3 mm is produced, the cured product preferably has a colorimetric value L ^* defined by the CIE 1976 L ^* a ^* b ^* color system of 30 or more. .
The sealing material colored in black or having the colorimetric value L ^* less than the lower limit value may change the color of the appearance even if the components constituting the sealing resin composition undergo oxidative degradation or the like. Since the problem hardly occurs, the problem of poor appearance of the semiconductor device hardly occurs. Therefore, in this embodiment, when the sealing resin composition is colored in a color other than black, or when the colorimetric value L ^* is equal to or higher than the lower limit, the effect of the present invention is more effective. Can get to.
Here, when the colorimetric value L ^* is 30 or more and less than 80, when the saturation C ^* is 7 or more, the problem of the appearance defect of the semiconductor device is particularly likely to occur. Can be obtained. Here, C ^* is calculated by {(a ^* ) ² + (b ^* ) ² } ^1/2 .

  The sealing resin composition according to this embodiment is usually a resin composition that gives a non-transparent cured product. Here, the non-transparent cured product specifically refers to the above sealing resin using a low-pressure transfer molding machine under conditions of a mold temperature of 175 ° C., an injection pressure of 9.8 MPa, and a curing time of 300 seconds. When the composition is transfer molded into a mold to produce a cured resin composition having a diameter of 50 mm and a thickness of 3 mm, the light transmittance at a wavelength of 400 nm in the film thickness direction of the cured product is preferably 50. % Or less, more preferably 25% or less, particularly preferably 10% or less. The light transmittance is measured using, for example, an ultraviolet-visible light spectrophotometer.

(Epoxy resin (A))
In this embodiment, examples of the epoxy resin (A) include biphenyl type epoxy resins; bisphenol type epoxy resins such as bisphenol A type epoxy resins, bisphenol F type epoxy resins, and tetramethylbisphenol F type epoxy resins; stilbene type epoxy resins. A novolac epoxy resin such as a phenol novolac epoxy resin and a cresol novolac epoxy resin; a polyfunctional epoxy resin such as a triphenolmethane epoxy resin and an alkyl-modified triphenolmethane epoxy resin; a phenylene skeleton and / or a biphenylene skeleton Phenol aralkyl type epoxy resins, phenol aralkyl type epoxy resins such as naphthol aralkyl type epoxy resins having a phenylene skeleton and / or a biphenylene skeleton Dihydroxynaphthalene-type epoxy resins, naphthol-type epoxy resins such as epoxy resins obtained by glycidyl etherification of dihydroxynaphthalene dimers; triazine nucleus-containing epoxy resins such as triglycidyl isocyanurate and monoallyl diglycidyl isocyanurate; dicyclopentadiene Examples include bridged cyclic hydrocarbon compound-modified phenol type epoxy resins such as modified phenol type epoxy resins, and these may be used alone or in combination of two or more.
Among these, one or two or more selected from the group consisting of bisphenol-type epoxy resins, biphenyl-type epoxy resins and phenol-aralkyl-type epoxy resins from the viewpoint of realizing a more excellent semiconductor device due to the balance of appearance and high-temperature storage characteristics It is preferable to contain.

  As the epoxy resin (A), a phenol aralkyl type epoxy resin represented by the following formula (1), represented by the following formula (2), from the viewpoint of realizing a more excellent semiconductor device due to a balance between appearance and high-temperature storage characteristics. It is particularly preferable to include at least one selected from the group consisting of a biphenyl type epoxy resin and a bisphenol type epoxy resin represented by the following formula (3).

（式（１）中、Ａｒ^１はフェニレン基またはナフチレン基を表し、Ａｒ^１がナフチレン基の場合、グリシジルエーテル基はα位、β位のいずれに結合していてもよい。Ａｒ^２はフェニレン基、ビフェニレン基またはナフチレン基のうちのいずれか１つの基を表す。Ｒ_ａおよびＲ_ｂは、それぞれ独立に炭素数１〜１０の炭化水素基を表す。ｇは０〜５の整数であり、ｈは０〜８の整数である。ｎ^３は重合度を表し、その平均値は１〜３である）

(In Formula (1), Ar ¹ represents a phenylene group or a naphthylene group, and when Ar ¹ is a naphthylene group, the glycidyl ether group may be bonded to either the α-position or the β-position. Ar ² is a phenylene group. And R _a and R _b each independently represent a hydrocarbon group having 1 to 10 carbon atoms, g is an integer of 0 to 5, and h represents _a group selected from the group consisting of a biphenylene group and a naphthylene group. Is an integer of 0 to 8. n ³ represents the degree of polymerization, and the average value is 1 to 3)

（式（２）中、複数存在するＲ_ｃは、それぞれ独立に水素原子または炭素数１〜４の炭化水素基を表す。ｎ^５は重合度を表し、その平均値は０〜４である）

(In Formula (2), a plurality of R _{c s} each independently represent a hydrogen atom or a hydrocarbon group having 1 to 4 carbon atoms. N ⁵ represents the degree of polymerization, and the average value thereof is 0 to 4).

（式（３）中、複数存在するＲ_ｄおよびＲ_ｅは、それぞれ独立に水素原子または炭素数１〜４の炭化水素基を表す。ｎ^６は重合度を表し、その平均値は０〜４である）

(In the formula (3), a plurality of R _d and R _e each independently represents a hydrogen atom or a hydrocarbon group having 1 to 4 carbon atoms. N ⁶ represents a degree of polymerization, and an average value thereof is 0 to 4). Is)

In the present embodiment, the content of the epoxy resin (A) in the sealing resin composition is preferably 2% by mass or more when the entire sealing resin composition is 100% by mass, and preferably 3% by mass. % Or more is more preferable, and 4% by mass or more is particularly preferable. By making content of an epoxy resin (A) more than the said lower limit, sufficient fluidity | liquidity can be implement | achieved at the time of shaping | molding, and the improvement of a fillability or a moldability can be aimed at.
On the other hand, the content of the epoxy resin (A) in the encapsulating resin composition is preferably 40% by mass or less, and 30% by mass or less when the entire encapsulating resin composition is 100% by mass. Is more preferable, and it is especially preferable that it is 15 mass% or less. Improve moisture resistance reliability and reflow resistance for a semiconductor device including a sealing material formed using a sealing resin composition by setting the content of the epoxy resin (A) to the upper limit value or less. Can do.

(Inorganic filler (B))
In this embodiment, what is generally used for the resin composition for semiconductor sealing can be used as an inorganic filler (B). Examples thereof include silica such as fused silica and crystalline silica, alumina, talc, titanium oxide, silicon nitride, aluminum nitride, and the like. Among these, from the viewpoint of excellent versatility, it is preferable to use silica, and it is more preferable to use fused silica. Further, the inorganic filler (B) is preferably spherical, and more preferably spherical silica. These inorganic fillers (B) may be used individually by 1 type, and may use 2 or more types together.
Thereby, the fluidity | liquidity of the resin composition for sealing at the time of shaping | molding can be improved, and it can contribute to the improvement of shaping | molding stability.

In the present embodiment, the content of the inorganic filler (B) in the encapsulating resin composition is preferably 50% by mass or more when the entire encapsulating resin composition is 100% by mass, 70 It is more preferably at least mass%, particularly preferably at least 80 mass%. By setting the content of the inorganic filler (B) to the above lower limit value or more, the semiconductor device obtained by improving the low hygroscopicity and low thermal expansion of the sealing material formed using the sealing resin composition The moisture resistance reliability and reflow resistance can be improved more effectively.
On the other hand, the content of the inorganic filler (B) in the sealing resin composition is preferably 95% by mass or less, and 93% by mass when the entire sealing resin composition is 100% by mass. More preferably, it is more preferably 90% by mass or less. By making content of an inorganic filler (B) below the said upper limit, the fluidity | liquidity and filling property at the time of shaping | molding of the resin composition for sealing can be improved more effectively.

The average particle diameter D ₅₀ of the inorganic filler (B) is preferably 0.01 μm or more and 50 μm or less, and more preferably 0.1 μm or more and 30 μm or less. By the average particle diameter D ₅₀ of less than the above lower limit, the fluidity of the encapsulating resin composition is made excellent, it is possible to improve the formability more effectively. Further, by the average particle diameter D ₅₀ and more than the above upper limit can reliably prevent the gate clogging occurs. The average particle diameter _{D 50} is a commercially available laser particle size distribution analyzer (e.g., manufactured by Shimadzu Corporation, SALD-7000) is the average particle size as measured by.

・
(Curing agent (C))
In this embodiment, as a hardening | curing agent (C), it can divide roughly into three types, for example, a polyaddition type hardening | curing agent, a catalyst type hardening | curing agent, and a condensation type hardening | curing agent.
Examples of polyaddition type curing agents include aliphatic polyamines such as diethylenetriamine (DETA), triethylenetetramine (TETA), and metaxylylene diamine (MXDA), diaminodiphenylmethane (DDM), and m-phenylenediamine (MPDA). In addition to aromatic polyamines such as diaminodiphenylsulfone (DDS), polyamine compounds containing dicyandiamide (DICY), organic acid dihydrazide, etc .; alicyclics such as hexahydrophthalic anhydride (HHPA), methyltetrahydrophthalic anhydride (MTHPA) Acid anhydrides including aromatic acid anhydrides such as acid anhydride, trimellitic anhydride (TMA), pyromellitic anhydride (PMDA), and benzophenone tetracarboxylic acid (BTDA); phenol resin curing agents; polysulfide, thioes Le, polymercaptan compounds such as thioether; an isocyanate prepolymer, an isocyanate compound such as a blocked isocyanate; organic acids such as carboxylic acid-containing polyester resins.

Examples of the catalyst-type curing agent include tertiary amine compounds such as benzyldimethylamine (BDMA) and 2,4,6-trisdimethylaminomethylphenol (DMP-30); 2-methylimidazole, 2-ethyl-4 -Imidazole compounds such as methylimidazole (EMI24); Lewis acids such as BF ₃ complexes.

  Examples of the condensation type curing agent include a resol type phenol resin; a urea resin such as a methylol group-containing urea resin; and a melamine resin such as a methylol group-containing melamine resin.

Among these, a phenol resin-based curing agent is preferable from the viewpoint of balance of flame resistance, moisture resistance, electrical characteristics, curability, storage stability, and the like. The phenol resin-based curing agent is a monomer, oligomer, or polymer in general having two or more phenolic hydroxyl groups in one molecule, and its molecular weight and molecular structure are not particularly limited. For example, phenol novolak resin, cresol novolak Resin, novolak-type phenol resin such as bisphenol novolac; polyfunctional phenol resin such as trisphenolmethane-type phenol resin; modified phenol resin such as terpene-modified phenol resin and dicyclopentadiene-modified phenol resin; phenylene skeleton and / or biphenylene skeleton Phenol aralkyl type resins such as phenol aralkyl resins having a phenylene skeleton and / or biphenylene skeleton, and the like; bisphenols such as bisphenol A and bisphenol F Lumpur compounds. These may be used alone or in combination of two or more.
Among these, from the viewpoint of realizing a more excellent semiconductor device due to the balance between appearance and high-temperature storage characteristics, one or more selected from the group consisting of phenol aralkyl resins, novolac type phenol resins, and polyfunctional type phenol resins are used. It is preferable to include.

  Among these, from the viewpoint of realizing a more excellent semiconductor device due to a balance between appearance and high-temperature storage characteristics, a group consisting of a phenol aralkyl resin and a novolac type phenol resin represented by the following formula (4) as the curing agent (C). It is particularly preferable that at least one selected from the group consisting of:

（式（４）中、Ａｒ^３はフェニレン基またはナフチレン基を表し、Ａｒ^３がナフチレン基の場合、水酸基はα位、β位のいずれに結合していてもよい。Ａｒ^４はフェニレン基、ビフェニレン基およびナフチレン基のうちのいずれか１つの基を表す。Ｒ^７およびＲ^８はそれぞれ独立に炭素数１〜１０の炭化水素基を表す。ｉは０〜５の整数であり、ｊは０〜８の整数である。ｎ^４は重合度を表し、その平均値は１〜３である。）

(In formula (4), Ar ³ represents a phenylene group or a naphthylene group, and when Ar ³ is a naphthylene group, the hydroxyl group may be bonded to either the α-position or the β-position. Ar ⁴ is a phenylene group or biphenylene. And R ⁷ and R ⁸ each independently represents a hydrocarbon group having 1 to 10 carbon atoms, i is an integer of 0 to 5, and j is 0 to 0. .n ⁴ is an integer of 8 represents a polymerization degree, the average value is 1-3.)

In the present embodiment, the content of the curing agent (C) in the sealing resin composition is preferably 0.5% by mass or more when the entire sealing resin composition is 100% by mass, The content is more preferably 1% by mass or more, and particularly preferably 2% by mass or more. By setting the content of the curing agent (C) to the above lower limit value or more, sufficient fluidity can be realized at the time of molding, and filling properties and moldability can be improved.
On the other hand, the content of the curing agent (C) in the sealing resin composition is preferably 15% by mass or less, preferably 10% by mass or less, when the entire sealing resin composition is 100% by mass. It is more preferable that it is, and it is especially preferable that it is 8 mass% or less. Improve moisture resistance reliability and reflow resistance of a semiconductor device including a sealing material formed using a sealing resin composition by setting the content of the curing agent (C) to the upper limit value or less. Can do.

(Colorant (D))
In this embodiment, as a coloring agent (D), if it is a coloring agent with sufficient coloring power, it will not specifically limit, Arbitrary coloring agents can be used. For example, one or two selected from blue colorants, yellow colorants, green colorants, red colorants, white colorants, orange colorants, purple colorants, brown colorants, etc. The above can be used.

Blue colorants include ultramarine, bitumen, cobalt blue, alkali blue lake, phthalocyanine blue, indanthrene blue, indigo, Victoria blue lake, fast sky blue, aniline blue, ultramarine blue, calco oil blue, methylene blue chloride, Blue pigments such as methylene blue or blue dyes can be used.
Yellow colorants include yellow lead, zinc white, yellow iron oxide, cadmium yellow, chrome yellow, hansa yellow, titanium yellow, benzine yellow, selenium yellow, quinoline yellow, permanent yellow, monoazo yellow, disazo yellow, insoluble azo, Examples thereof include yellow pigments or yellow dyes such as azo pigments such as condensed azo and azo lake.
Examples of the green colorant include green pigments or green dyes such as chrome green, chromium oxide, emerald green, naphthol green, green gold, acid green lake, malachite green lake, phthalocyanine green, and polychlorobrom copper phthalocyanine.
Red colorants include Bengala, Cadmium Red, Antimony Red, Permanent Red, Irgadin Red, Perylene Red, Rhodamine Lake, Alizarin Lake, Thioindigo Red, PV Carmine, Monolite Face Tread, Quinacridone, Watching Red, Resol Condensation of red, brilliantamine, dapon oil red, pyrazolone red, rhodamine B lake, lake red C, rose bengal, oxine red, alizarin lake, anthraquinone, indigo, isoindoline diketopyrrolopyrrole, chromofine red, etc. Red pigments such as polycyclic pigments or red dyes can be used.
As the white colorant, white pigments or white dyes such as titanium oxide, zinc white, zinc sulfide, lead white, lithobon, and antimony oxide can be used.
As the orange colorant, an orange pigment or an orange dye such as chrome vermilon, permanent orange, Vulcan first orange, or indanthrene brilliant orange can be used.
As the purple colorant, purple pigments or purple dyes such as cobalt purple, manganese purple, first violet, methyl violet lake, indanthrene brilliant violet, dioxazine violet can be used.
As the brown colorant, a brown pigment such as iron oxide, permanent brown, para-brown, or a brown dye can be used.
These may be used alone or in combination of two or more.

  In the present embodiment, the content of the colorant (D) in the sealing resin composition is not particularly limited as long as sufficient coloring power can be obtained, but the entire sealing resin composition is 100 masses. %, It is 0.01 mass% or more and 5 mass% or less, More preferably, it is 0.1 mass% or more and 3 mass% or less. If content of a coloring agent (D) is in the said range, coloring power can be improved further, without impairing the other characteristic of a sealing material.

(Antioxidant (E))
In this embodiment, as the antioxidant (E), one or more selected from hindered phenol compounds, hindered amine compounds and thioether compounds having two or more hindered phenol groups in one molecule are used. Including.

  As the hindered phenol group, a hindered phenol group represented by the following formula (5) is preferable.

ただし、式（５）において、Ｒ_１はそれぞれ独立に炭素数１〜４のアルキル基、好ましくはメチル基またはｔ−ブチル基、特に好ましくはｔ−ブチル基を表す。

However, in Formula (5), each R ₁ independently represents an alkyl group having 1 to 4 carbon atoms, preferably a methyl group or a t-butyl group, and particularly preferably a t-butyl group.

  Examples of the hindered phenol compound having two or more hindered phenol groups in one molecule include 1,3,5-tris (3,5-di-tert-butyl-4-hydroxybenzyl) -1,3. , 5-Triazine-2,4,6 (1H, 3H, 5H) -trione, 4,4 ', 4 "-(1-methylpropanyl-3-ylidene) tris (6-tert-butyl-m-cresol ), 6,6′-di-tert-butyl-4,4′-butylidenedi-m-cresol, pentaerythritol tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], 3 , 9-bis {2- [3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionyloxy] -1,1-dimethylethyl} -2,4,8,10- Traoxaspiro [5.5] undecane, 1,3,5-tris (3,5-di-tert-butyl-4-hydroxyphenylmethyl) -2,4,6-trimethylbenzene, 2,2′-thio Diethylbis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], N, N ′-(1,6-hexanediyl) bis [3,5-bis (1,1-dimethyl) Ethyl) -4-hydroxybenzenepropanamide], bis [3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionic acid] [ethylenebis (oxyethylene)], 1,6-hexanediol bis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], etc. These may be used alone or in combination of two or more.

  Examples of hindered amine compounds include tetrakis (1,2,2,6,6-pentamethyl-4-piperidyl) butane-1,2,3,4-tetracarboxylate, tetrakis (2,2,6,6-tetramethyl). -4-piperidyl) butane-1,2,3,4-tetracarboxylate, 1,2,3,4-butanetetracarboxylic acid and 1,2,2,6,6-pentamethyl-4-piperidinol and 3, 9-bis (2-hydroxy-1,1-dimethylethyl) -2,4,8,10-tetraoxaspiro [5.5] undecane mixed ester, 1,2,3,4-butanetetracarboxylic Acid and 2,2,6,6-tetramethyl-4-piperidinol and 3,9-bis (2-hydroxy-1,1-dimethylethyl) -2,4,8,10-tetraoxaspiro [ .5] Mixed esterified product with undecane, bis (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate, bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate, bis (1-undecanoxy-2,2,6,6-tetramethylpiperidin-4-yl) carbonate, 1,2,2,6,6-pentamethyl-4-piperidyl methacrylate, 2,2,6,6-tetramethyl Reaction product of -4-piperidyl methacrylate, 2,2,6,6-tetramethylpiperidin-4-ylhexadecanoate and 2,2,6,6-tetramethylpiperidin-4-yloctadecanoate, etc. Is mentioned. These may be used alone or in combination of two or more.

  Examples of the thioether compound include 2,2-bis {[3- (dodecylthio) -1-oxopropoxy] methyl} propane-1,3-diylbis [3- (dodecylthio) propionate], di (tridecyl) -3,3. Examples include '-thiodipropionate. These may be used alone or in combination of two or more.

  Among these, 3,9-bis {2- [3- (3-tert-butyl-4-hydroxy-5-methylphenyl) from the viewpoint of realizing a more excellent semiconductor device due to a balance between appearance and high-temperature storage characteristics. Propionyloxy] -1,1-dimethylethyl} -2,4,8,10-tetraoxaspiro [5.5] undecane, 1,3,5-tris (3,5-di-tert-butyl-4- Hydroxybenzyl) -1,3,5-triazine-2,4,6 (1H, 3H, 5H) -trione and pentaerythritol tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate It is particularly preferred that one or more selected from the group consisting of:

  In the present embodiment, the content of the antioxidant (E) in the sealing resin composition is preferably 0.1% by mass or more and 2.0% when the entire sealing resin composition is 100% by mass. It is not more than mass%, more preferably not less than 0.2 mass% and not more than 1.0 mass%. If the content of the antioxidant (E) is within the above range, the oxidative deterioration of each component constituting the sealing resin composition can be more effectively suppressed without impairing other properties of the sealing material. .

(Other ingredients (F))
For the sealing resin composition, one or more of various additives such as a coupling agent, a curing accelerator, a mold release agent, an ion scavenger, a low stress component, a flame retardant, and the like are appropriately used as necessary. Can be blended.
Coupling agents include, for example, known cups such as epoxy silane, mercapto silane, amino silane, alkyl silane, ureido silane, vinyl silane, methacryl silane and other silane compounds, titanium compounds, aluminum chelates, and aluminum / zirconium compounds. One type or two or more types selected from ring agents can be included. Among these, as what expresses the effect of this invention more effectively, it is more preferable to contain an epoxy silane or aminosilane, and it is especially preferable from a viewpoint of fluidity | liquidity to contain secondary aminosilane.
Examples of the curing accelerator include organic phosphines, tetra-substituted phosphonium compounds, phosphobetaine compounds, adducts of phosphine compounds and quinone compounds, phosphorus atom-containing compounds such as adducts of phosphonium compounds and silane compounds; 1,8-diazabicyclo (5,4,0) undecene-7, benzyldimethylamine, 2-methylimidazole and the like, one kind selected from nitrogen atom-containing compounds such as amidine and tertiary amine, and quaternary salts of the above amidine and amine Or two or more types can be included. Among these, it is more preferable that a phosphorus atom containing compound is included from a viewpoint of improving curability. In addition, from the viewpoint of improving the balance between moldability and curability, it has latent properties such as tetra-substituted phosphonium compounds, phosphobetaine compounds, adducts of phosphine compounds and quinone compounds, and adducts of phosphonium compounds and silane compounds. It is more preferable to include those.
The mold release agent may contain, for example, natural wax such as carnauba wax, synthetic wax such as montanic acid ester wax, higher fatty acid such as zinc stearate and metal salts thereof, and one or more selected from paraffin. it can.
The ion scavenger includes, for example, hydrotalcite.
The low stress component includes, for example, silicone oil and silicone rubber.
The flame retardant can include one or more selected from, for example, aluminum hydroxide, magnesium hydroxide, zinc borate, zinc molybdate, and phosphazene.

  As the sealing resin composition, for example, the above-mentioned components are mixed by known means, further melt-kneaded with a kneader such as a roll, kneader or extruder, cooled and pulverized, and tableted after pulverization. For example, it is possible to use a tablet that has been molded into a tablet shape, or that has been appropriately adjusted in dispersity, fluidity, and the like.

Next, the semiconductor device 100 will be described.
FIG. 1 is a cross-sectional view showing an example of a semiconductor device 100 according to the present embodiment. The semiconductor device 100 is a semiconductor package including a base material 10, a semiconductor element 20 mounted on the base material 10, and a sealing material 30 that seals the semiconductor element 20. FIG. 1 illustrates the case where the semiconductor device 100 is a BGA package. In this case, a plurality of solder balls 50 are provided on the back surface of the substrate 10 opposite to the surface on which the semiconductor element 20 is mounted.
The semiconductor element 20 is electrically connected to the base material 10 through the bonding wire 40. On the other hand, the semiconductor element 20 may be flip-chip mounted on the base material 10.

  In this embodiment, the sealing material 30 is comprised by the hardened | cured material of the above-mentioned sealing resin composition. Thereby, discoloration and oxidation of the sealing material 30 can be suppressed when the semiconductor element 20 is sealed. For this reason, it is possible to realize the manufacture of the semiconductor device 100 having an excellent balance between appearance and high-temperature storage characteristics. The sealing material 30 is formed, for example, by sealing and molding the sealing resin composition using a known method such as a transfer molding method or a compression molding method.

Next, the structure 102 will be described.
FIG. 2 is a cross-sectional view showing an example of the structure 102 according to the present embodiment. The structure 102 is a molded product formed by MAP molding. For this reason, a plurality of semiconductor packages are obtained by dividing the structure 102 into pieces for each semiconductor element 20.
The structure 102 includes a base material 10, a plurality of semiconductor elements 20, and a sealing material 30. The plurality of semiconductor elements 20 are arranged on the base material 10. In FIG. 2, the case where each semiconductor element 20 is electrically connected to the base material 10 through the bonding wire 40 is illustrated. However, the present invention is not limited to this, and each semiconductor element 20 may be flip-chip mounted on the base material 10. Note that the substrate 10 and the semiconductor element 20 can be the same as those exemplified in the semiconductor device 100.

  The sealing material 30 seals the plurality of semiconductor elements 20. The sealing material 30 is comprised by the hardened | cured material of the resin composition for sealing mentioned above. Thereby, discoloration and oxidation of the sealing material 30 can be suppressed when the plurality of semiconductor elements 20 are sealed. For this reason, it becomes possible to realize the structure 102 having an excellent balance between appearance and high-temperature storage characteristics and a semiconductor device obtained by dividing the structure 102 into individual pieces. The sealing material 30 is formed, for example, by sealing and molding the sealing resin composition using a known method such as a transfer molding method or a compression molding method.

  As mentioned above, although embodiment of this invention was described, these are illustrations of this invention and various structures other than the above are also employable.

  Hereinafter, the present embodiment will be described in detail with reference to examples and comparative examples. In addition, this embodiment is not limited to description of these Examples at all.

(Resin composition for sealing)
About each of Examples 1-12 and Comparative Examples 1-3, the resin composition for sealing was prepared as follows. First, according to the formulation shown in Table 1, each component was pulverized and mixed using a mixer, and then roll kneaded at 80 ° C. for 5 minutes. Next, this was cooled and pulverized to obtain a sealing resin composition.
Details of each component in Table 1 are as follows. In addition, the mixture ratio of each component shown in Table 1 points out the mixture ratio (mass%) with respect to the whole resin composition for sealing.

(Epoxy resin (A))
Epoxy resin 1: phenol aralkyl type epoxy resin containing biphenylene skeleton (Nippon Kayaku Co., Ltd., NC-3000)
Epoxy resin 2: bisphenol A type epoxy resin (manufactured by Mitsubishi Chemical Corporation, Epicoat YL6810)
Epoxy resin 3: biphenyl type epoxy resin (manufactured by Mitsubishi Chemical Corporation, Epicoat YX4000K)
Epoxy resin 4: Orthocresol novolac type epoxy resin (manufactured by Nippon Kayaku Co., Ltd., EOCN-1020-55)

(Inorganic filler (B))
Inorganic filler 1: spherical fused silica (Micron, S-CO, average particle size: 21 μm)
Inorganic filler 2: Spherical fused silica (manufactured by Admatechs, SO-25R, average particle size: 0.5 μm)

(Curing agent (C))
Phenol resin-based curing agent 1: phenol aralkyl resin having a biphenylene skeleton (GPH-65 manufactured by Nippon Kayaku Co., Ltd./MEH-7851SS manufactured by Meiwa Kasei Co., Ltd.)
Phenol resin-based curing agent 2: Phenol novolak resin (manufactured by Sumitomo Bakelite, PR-HF3)

(Colorant (D))
Colorant 1: Red colorant (manufactured by Dainichi Seika Kogyo Co., Ltd., Chromofine Red 6605T, classification: Chromofine Red, main component: 4,4′-diamino-1,1′-bianthracene-9,9 ′, 10,10′-tetraone)
Colorant 2: Yellow colorant (manufactured by Dainichi Seika Kogyo Co., Ltd., Seika First Yellow 2054C, classification: monoazo yellow, main component: pigment yellow 74 (2-[(2-methoxy-4-nitrophenyl) azo] -N -(2-methoxyphenyl) -3-oxobutanamide))
Colorant 3: Blue colorant (Daiichi Seika Kogyo Co., Ltd., cyanine blue 6820, classification: phthalocyanine blue, main component: pigment blue 15: 3 (β crystal of copper phthalocyanine))

(Antioxidant (E))
Hindered phenolic compound 1: 3,9-bis {2- [3- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionyloxy] -1,1-dimethylethyl} -2,4 8,10-tetraoxaspiro [5.5] undecane (ADEKA STAB AO-80 manufactured by ADEKA)
Hindered phenol compound 2: pentaerythritol tetrakis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate] (Adeka Adeka Stub AO-60)
Hindered phenol compound 3: 1,3,5-tris (3,5-di-tert-butyl-4-hydroxybenzyl) -1,3,5-triazine-2,4,6 (1H, 3H, 5H ) -Trion (ADEKA ADEKA STAB AO-20)
Hindered phenol-based compound 4: 2,6-di-t-butyl-p-cresol hindered amine-based compound 1: bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate (ADEKA STAB LA- manufactured by ADEKA) 77Y)
Thioether compound 1: 2,2-bis {[3- (dodecylthio) -1-oxopropoxy] methyl} propane-1,3-diylbis [3- (dodecylthio) propionate] (ADEKA STAB AO-412S manufactured by ADEKA)
Phosphite compound 1: Tris (2,4-di-tert-butylphenyl) phosphite (ADEKA STAB 2112 manufactured by ADEKA)

(Other ingredients (F))
Mold release agent 1: Montanate ester wax (manufactured by Clariant, Lycowax PED191)
Curing accelerator 1: a mixture of curing accelerator A described in paragraph 0021 of JP-A-2004-231765 and curing accelerator B shown in paragraph 0084 of JP-A-2007-246671 at a weight of 1: 3

<Appearance evaluation of sealing material>
The appearance of the sealing material was evaluated by measuring the color difference of the sealing resin compositions obtained in Examples and Comparative Examples.

(Preparation of test piece)
First, using a low-pressure transfer molding machine (“KTS-15” manufactured by Koki Seiki Co., Ltd.), the above-mentioned sealing resin was applied to the mold under conditions of a mold temperature of 175 ° C., an injection pressure of 9.8 MPa, and a curing time of 300 seconds. A cured product of the sealing resin composition was obtained by transfer molding the composition. This cured product had a diameter of 50 mm and a thickness of 3 mm.
Next, with respect to the obtained cured product, L ₁ ^* value, a ₁ ^* value, b ₁ ^* value were obtained using Color Reader CR-13 (measurement mode: transmission, number of measurements: n = 3) manufactured by Konica Minolta Sensing Co., Ltd. It was measured. The CIE 1976 L ^* a ^* b ^* color system values were converted into numerical values by the main body of the apparatus, and CIE 1976 L ^* a ^* b ^* color system data were obtained. C ^* was obtained by {(a ₁ ^* ) ² + (b ₁ ^* ) ² } ^1/2 . The obtained results are shown in Table 1.

(Post-curing treatment)
Next, the cured product was post-cured at 175 ° C. for 2 hours. The cured product after post-curing treatment in the same manner as described _{above, L} ^{2 *} _{value, a} ^{2 *} value _was measured _b ^{2 *} value. Next, a color difference ΔE ₁ was calculated from the following formula. The obtained results are shown in Table 1.
ΔE ₁ = {(L ₁ ^* −L ₂ ^* ) ² + (a ₁ ^* −a ₂ ^* ) ² + (b ₁ ^* −b ₂ ^* ) ² } ^1/2

(Reflow processing)
Next, the cured product after the post-curing treatment was heat-treated at 260 ° C. for 1 minute. The cured product after the heat treatment in the same manner as described _above, were _L ^{3 *} _{value, a} ^{3 *} _value, the _b ^{3 *} values were measured. Next, the color difference ΔE ₂ was calculated from the following formula. The obtained results are shown in Table 1.
ΔE ₂ = {(L ₂ ^* −L ₃ ^* ) ² + (a ₂ ^* −a ₃ ^* ) ² + (b ₂ ^* −b ₃ ^* ) ² } ^1/2

<Evaluation of high-temperature storage characteristics of semiconductor devices>
About the semiconductor device obtained using the resin composition for sealing obtained by the Example and the comparative example, the high temperature storage characteristic was evaluated in the following procedures.

Using a low-pressure transfer molding machine (“KTS-15” manufactured by Koki Seiki Co., Ltd.), the above resin composition for sealing was applied to the mold under conditions of a mold temperature of 175 ° C., an injection pressure of 9.8 MPa, and a curing time of 300 seconds. The lead frame on which the semiconductor element (silicon chip) is mounted is sealed and molded, and a 16-pin SOP (the semiconductor element uses a standard product for HAST TEG9. What is the inner lead portion of the semiconductor element and the lead frame? Bonded with a 25 μm diameter gold wire.) Was molded and post-cured at 175 ° C. for 2 hours to produce a semiconductor device.
The obtained semiconductor device was subjected to a high temperature storage test (HTSL) at 175 ° C., and the time when an element in which the electrical resistance value between the wirings increased by 20% with respect to the initial value was detected was determined as the defect occurrence time.

In the sealing resin compositions obtained in Examples 1 to 12, both ΔE ₁ and ΔE ₂ were low, and the semiconductor device produced using these sealing resin compositions was excellent in appearance. Moreover, the semiconductor device produced using these sealing resin compositions has a long time until occurrence of a defect and is excellent in high-temperature storage characteristics.
On the other hand, the sealing resin compositions obtained by Comparative Examples 1 to 3 had both high ΔE ₁ and ΔE _2, and the semiconductor devices produced using these sealing resin compositions were inferior in appearance. . Moreover, the semiconductor device produced using these sealing resin compositions has a short time until occurrence of a defect and is inferior in high-temperature storage characteristics.

DESCRIPTION OF SYMBOLS 100 Semiconductor device 102 Structure 10 Base material 20 Semiconductor element 30 Sealing material 40 Bonding wire 50 Solder ball

Claims (9)

A sealing resin composition comprising an epoxy resin (A), an inorganic filler (B), a curing agent (C), a colorant (D), and an antioxidant (E),
Sealing resin in which the antioxidant (E) contains one or more selected from hindered phenol compounds, hindered amine compounds and thioether compounds having two or more hindered phenol groups in one molecule Composition. In the sealing resin composition according to claim 1,
Using a low-pressure transfer molding machine, the sealing resin composition was transfer molded into a mold under the conditions of a mold temperature of 175 ° C., an injection pressure of 9.8 MPa, and a curing time of 300 seconds, and had a diameter of 50 mm and a thickness of 3 mm. When producing a cured product of the sealing resin composition,
The resin composition for sealing whose colorimetric value L ^* prescribed | regulated by CIE1976L ^* a ^* b ^* color system of the said hardened | cured material is 30 or more. In the sealing resin composition according to claim 1 or 2,
The sealing resin composition whose content of the said antioxidant (E) is 0.1 mass% or more and 2.0 mass% or less with respect to the said whole resin composition for sealing. In the sealing resin composition according to any one of claims 1 to 3,
A sealing resin composition, wherein the curing agent (C) is one or more selected from the group consisting of a phenol aralkyl resin, a novolac phenol resin, and a polyfunctional phenol resin. In the sealing resin composition according to any one of claims 1 to 4,
A sealing resin composition wherein the epoxy resin (A) is one or more selected from the group consisting of bisphenol-type epoxy resins, biphenyl-type epoxy resins, and phenol-aralkyl-type epoxy resins. In the sealing resin composition according to any one of claims 1 to 5,
The resin composition for sealing which is a granular material or a tablet form. In the sealing resin composition according to any one of claims 1 to 6,
A sealing resin composition used for sealing a semiconductor element excluding an optical semiconductor element. A substrate;
A semiconductor element mounted on one surface of the substrate;
A sealing material that is configured by a cured product of the sealing resin composition according to any one of claims 1 to 7 and that seals the semiconductor element and the one surface of the base material;
A semiconductor device comprising: A substrate;
A plurality of semiconductor elements mounted on one surface of the substrate;
A sealing material that is configured by a cured product of the sealing resin composition according to claim 1 and that seals the plurality of semiconductor elements and the one surface of the base material. When,
A structure comprising:

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