JP5524017B2 - Addition-curable silicone composition and semiconductor device in which semiconductor element is coated with cured product of the composition - Google Patents

Description

  The present invention relates to an addition-curable silicone composition and a semiconductor device using the same, and more specifically, low viscosity, good filling properties, good curability, curing, high refractive index, and light transmittance. Addition-curable silicone composition that forms a cured product that is high, has high adhesion to a substrate, and has excellent crack resistance and gas barrier properties, and a semiconductor element that is coated with a cured product of the composition, and excellent reliability The present invention relates to a semiconductor device.

  Addition-curable silicone compositions that cure by a hydrosilylation reaction are used as protective coating agents for semiconductor elements in optical semiconductor devices such as photocouplers, light-emitting diodes, and solid-state imaging elements. Such a protective coating agent for a semiconductor element is required not to absorb or scatter light because the element emits light or receives light.

  Examples of addition-curable silicone compositions that are cured by hydrosilylation reaction to form a cured product having a large refractive index and high light transmittance include, for example, organopolyesters containing silicon-bonded phenyl groups and silicon-bonded alkenyl groups. A curable organopolysiloxane composition comprising a siloxane, an organohydrogencyclosiloxane, and a hydrosilylation catalyst (see Patent Document 1); containing a silicon atom-bonded phenyl group and a silicon atom-bonded alkenyl group, and a viscosity of 10,000 cp A curable organopolysiloxane composition comprising a liquid or solid organopolysiloxane (25 ° C.) or more, an organohydrogenpolysiloxane having at least two silicon-bonded hydrogen atoms in one molecule, and a catalyst for hydrosilylation reaction (See Patent Document 2); Organopolysiloxane having at least two alkenyl groups bonded to elementary atoms and having an aryl group bonded to silicon atoms, and organopolysiloxane having at least two hydrogen atoms bonded to silicon atoms in one molecule Curable organopolysiloxane composition comprising siloxane and platinum aryl group-containing organosiloxane oligomer complex (see Patent Document 3); organopolysiloxane in which both molecular chain ends are blocked with silicon-bonded hydrogen atoms via siloxane bonds A composition (refer patent document 4) etc. are mentioned.

However, these curable organopolysiloxane compositions are difficult to balance between curing and transparency, and sometimes peel off due to a small amount of catalyst poison.
In addition, the viscosity is high and the filling property is poor, the adhesiveness of the cured product is poor and it is easy to peel off from the base material, the curability is difficult to control, the trouble is likely to occur during on-site production, the crack resistance is poor, the gas permeability is high, and the substrate There was also a problem of being easily corroded.
Furthermore, an addition-curable silicone composition (see Patent Document 5) in which a linear silicone oil and a silicone resin having a branched structure are used in combination has also been proposed, but its adhesion to a substrate and crack resistance are insufficient. there were.

JP-A-8-176447 Japanese Patent Laid-Open No. 11-1619 JP 2003-128922 A JP 2005-105217 A JP 2004-143361 A

  The present invention has been made in view of the above circumstances, and has a low viscosity, a good filling property, a good curability, a curing, a high refractive index, a high light transmittance, a high adhesion to a substrate, and a high resistance. An object of the present invention is to provide an addition-curable silicone composition that forms a cured product with excellent cracking properties and low gas permeability, and a semiconductor device with excellent reliability in which a semiconductor element is coated with a cured product of the composition. And

In order to solve the above problems, the present invention provides at least
(A) Organopolysiloxane represented by the following average unit formula (1): 100 parts by mass,
(R ¹ SiO _3/2 ) _a1 (R ¹ ₂ SiO _2/2 ) _b1 (R ¹ ₃ SiO _1/2 ) _c1 (X ¹ O _1/2 ) _d1 (1)
{In the formula, R ¹ may be the same or different and is a substituted or unsubstituted monovalent hydrocarbon group (provided that 0.1 to 50 mol% of R ¹ is an alkenyl group, and 10 mol% of R ¹ The above is an aryl group), and X ¹ is a hydrogen atom or an alkyl group. a1 is 0.25 to 1, b1 is 0 to 0.75, c1 is 0 to 0.3, d1 is 0 to 0.1, and a1 + b1 + c1 + d1 is 1. }
(B) Organopolysiloxane represented by the following average unit formula (2): 1 to 99 parts by mass,
(R ² SiO _3/2 ) a ₂ (R ² ₂ SiO _2/2 ) _{b 2} (R ² ₃ SiO _1/2 ) _c ² (X ² O _1/2 ) _{d 2} (2)
{In the formula, R ² may be the same or different and is a substituted or unsubstituted monovalent hydrocarbon group (provided that 0.001 to 20 mol% of R ² is an alkenyl group, and 10 mol% of R ² The above is an aryl group), and X ² is a hydrogen atom or an alkyl group. a2 is 0.005 to 0.1, b2 is 0.5 to 0.95, c2 is 0.005 to 0.1, d2 is 0 to 0.1, and a2 + b2 + c2 + d2 is 1. }
(C) The compound represented by the following average composition formula (3) has at least two Si—H bonds in one molecule, and 5 mol% or more of the total of R ′ and H bonded to a silicon atom is a phenyl group. Organohydrogenpolysiloxane: an amount of 1 to 200 parts by mass with respect to 100 parts by mass in total of the components (A) + (B),
R ′ _{a ′} H _{b ′} SiO _{[(4-a′-b ′) / 2]} (3)
(In the formula, R ′ is a substituted or unsubstituted monovalent hydrocarbon group which may be the same or different except for an aliphatic unsaturated hydrocarbon group. A ′ and b ′ are 0.7 ≦ a ′. ≦ 2.1, 0.01 ≦ b ′ ≦ 1.0, and 0.8 ≦ a ′ + b ′ ≦ 2.7.
And (D) a catalyst for hydrosilylation reaction: an addition-curable silicone composition comprising an amount that promotes curing of the present composition.

  Such an addition-curable silicone composition of the present invention has low viscosity, good filling properties, and good curability. Further, when cured, the cured product has a high refractive index, high light transmittance, high adhesion to the substrate, excellent crack resistance, and low gas permeability.

Further, in the component (A), it is preferable that the content of the aryl group R ¹ in the average unit formula (1) is 30 mol% or more.

  As described above, when the content of the organosilicon-bonded aryl group with respect to the silicon-bonded organic group in the average unit formula (1) constituting the component (A) is 30 mol% or more, the refractive index and light transmittance are excellent. At the same time, the crack resistance is further improved.

Further, in the component (B), it is preferable that the content of the aryl group R ² of the average unit formula (2) is 30 mol% or more.

  Thus, if the content of the organosilicon-bonded aryl group relative to the silicon-bonded organic group in the average unit formula (2) constituting the component (B) is 30 mol% or more, the refractive index and light transmittance are excellent. At the same time, the crack resistance is further improved.

  In the component (C), it is preferable that 5 to 50 mol% of the total of R ′ and H bonded to the silicon atom in the average composition formula (3) is a phenyl group.

  Thus, what is 5-50 mol% of the sum total of R 'and H couple | bonded with the silicon atom in the said average composition formula (3) is a phenyl group is compatibility with (A) and (B) component. It is preferably used in terms of physical properties of the cured product.

  Moreover, it is preferable to cure to form a cured product having a refractive index (25 ° C.) in visible light (589 nm) of 1.5 or more.

  Thus, if it is a composition which can harden | cure and can form the hardened | cured material whose refractive index (25 degreeC) in visible light (589 nm) is 1.5 or more, the semiconductor coat | covered with the hardened | cured material of the composition Sufficient reliability can be imparted to a semiconductor device having an element.

  Moreover, it is preferable to cure to form a cured product having a light transmittance (25 ° C.) of 80% or more.

  Thus, if it is a composition which can harden | cure and can form the hardened | cured material whose light transmittance (25 degreeC) is 80% or more, in the semiconductor device which has the semiconductor element coat | covered with the hardened | cured material of the composition, Sufficient reliability can be imparted.

  The present invention also provides a semiconductor device characterized in that a semiconductor element is covered with a cured product of the addition-curable silicone composition.

  Such a semiconductor device of the present invention has a high refractive index, high light transmittance, high adhesion to a substrate, excellent crack resistance, low gas permeability, and the addition-curable silicone composition of the present invention. Since it is coated with a cured product, it is excellent in reliability.

  As described above, the addition-curable silicone composition of the present invention has low viscosity, good filling properties, good curability, cures, has a high refractive index, high light transmittance, and high adhesion. The semiconductor device of the present invention is characterized by forming a cured product having excellent crack resistance and low gas permeability, and the semiconductor element is covered with a cured product of the above composition. It is characterized by being excellent.

It is a schematic sectional drawing which shows an example of the semiconductor device in which the addition-curable silicone composition of this invention is used suitably.

Hereinafter, the present invention will be described in more detail.
As described above, the conventional addition-curable silicone composition is difficult to balance between curing and transparency, sometimes peels off with a small amount of catalyst poison, and has a high viscosity and poor filling property. In addition, the cured product has poor adhesiveness and is easily peeled off from the base material, and it is difficult to control the curability.

  Therefore, as a result of intensive studies to solve the above problems by the present inventors, if a long-chain aryl group-containing organopolysiloxane branched in a component is used, a portion branched into a molecule in a long-chain oil In particular, it is possible to reduce gas permeability, improve durability during a thermal shock test, etc., and to adjust the refractive index and light depending on the composition of each component forming the composition. Various properties such as curability, crack resistance, and adhesion can be improved while maintaining good permeability, and the inventors have found that the problems can be solved and completed the present invention.

That is, the addition-curable silicone composition of the present invention has at least
(A) Organopolysiloxane represented by the following average unit formula (1): 100 parts by mass,
(R ¹ SiO _3/2 ) _a1 (R ¹ ₂ SiO _2/2 ) _b1 (R ¹ ₃ SiO _1/2 ) _c1 (X ¹ O _1/2 ) _d1 (1)
{In the formula, R ¹ may be the same or different and is a substituted or unsubstituted monovalent hydrocarbon group (provided that 0.1 to 50 mol% of R ¹ is an alkenyl group, and 10 mol% of R ¹ The above is an aryl group), and X ¹ is a hydrogen atom or an alkyl group. a1 is 0.25 to 1, b1 is 0 to 0.75, c1 is 0 to 0.3, d1 is 0 to 0.1, and a1 + b1 + c1 + d1 is 1. }
(B) Organopolysiloxane represented by the following average unit formula (2): 1 to 99 parts by mass,
(R ² SiO _3/2 ) a ₂ (R ² ₂ SiO _2/2 ) _{b 2} (R ² ₃ SiO _1/2 ) _c ² (X ² O _1/2 ) _{d 2} (2)
{In the formula, R ² may be the same or different and is a substituted or unsubstituted monovalent hydrocarbon group (provided that 0.001 to 20 mol% of R ² is an alkenyl group, and 10 mol% of R ² The above is an aryl group), and X ² is a hydrogen atom or an alkyl group. a2 is 0.005 to 0.1, b2 is 0.5 to 0.95, c2 is 0.005 to 0.1, d2 is 0 to 0.1, and a2 + b2 + c2 + d2 is 1. }
(C) The compound represented by the following average composition formula (3) has at least two Si—H bonds in one molecule, and 5 mol% or more of the total of R ′ and H bonded to a silicon atom is a phenyl group. Organohydrogenpolysiloxane: an amount of 1 to 200 parts by mass with respect to 100 parts by mass in total of the components (A) + (B),
R ′ _{a ′} H _{b ′} SiO _{[(4-a′-b ′) / 2]} (3)
(In the formula, R ′ is a substituted or unsubstituted monovalent hydrocarbon group which may be the same or different except for an aliphatic unsaturated hydrocarbon group. A ′ and b ′ are 0.7 ≦ a ′. ≦ 2.1, 0.01 ≦ b ′ ≦ 1.0, and 0.8 ≦ a ′ + b ′ ≦ 2.7.
And (D) a catalyst for hydrosilylation reaction: characterized in that it contains an amount that promotes curing of the composition.

Hereinafter, each component of the composition of this invention is demonstrated in detail.
<(A) component>
The component (A) is an organopolysiloxane represented by the following average unit formula (1).
(R ¹ SiO _3/2 ) _a1 (R ¹ ₂ SiO _2/2 ) _b1 (R ¹ ₃ SiO _1/2 ) _c1 (X ¹ O _1/2 ) _d1 (1)
{In the formula, R ¹ may be the same or different and is a substituted or unsubstituted monovalent hydrocarbon group (provided that 0.1 to 50 mol% of R ¹ is an alkenyl group, and 10 mol% of R ¹ The above is an aryl group), and X ¹ is a hydrogen atom or an alkyl group. a1 is 0.25 to 1, b1 is 0 to 0.75, c1 is 0 to 0.3, d1 is 0 to 0.1, and a1 + b1 + c1 + d1 is 1. }

Examples of the alkenyl group in R ¹ include a vinyl group, an allyl group, a butenyl group, a pentenyl group, and a hexenyl group, and a vinyl group is particularly preferable. The content of the alkenyl group in R ¹ is 0.1 to 50 mol%, preferably 1 to 40 mol%, particularly preferably 5 to 30 mol%. If it is less than 0.1 mol%, the curability of the composition becomes insufficient, and if it exceeds 50 mol%, the cured product becomes brittle and the crack resistance decreases.

Moreover, examples of the aryl group in R ¹ include a phenyl group, a tolyl group, a xylyl group, and a naphthyl group, and a phenyl group is particularly preferable. The content of the aryl group in R ¹ is 10 mol% or more, preferably 30 mol% or more, more preferably 40 to 99.9 mol%, particularly preferably 45 to 95 mol%. The light transmittance of hardened | cured material falls that it is less than 10 mol%. Moreover, if it is 30 mol% or more, while being excellent in a refractive index and light transmittance, it will become the thing which was further excellent in crack resistance.

Examples of the silicon atom-bonded organic group other than the alkenyl group and aryl group in R ¹ include alkyl groups such as methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, heptyl group; benzyl group, phenethyl group Aralkyl groups such as groups; substituted or unsubstituted monovalent hydrocarbon groups such as halogenated alkyl groups such as chloromethyl group, 3-chloropropyl group, 3,3,3-trifluoropropyl group, etc. A methyl group is preferred.

Further, in the above average unit formula (1), X ¹ is a hydrogen atom or an alkyl group, examples of the alkyl group, the same groups as those exemplified as R ¹ are exemplified, in particular, a methyl group, an ethyl group Preferably there is.

A1 is 0.25 to 1, preferably 0.5 to 1, particularly preferably 0.6 to 1, and b1 is 0 to 0.75, preferably 0 to 0.5, particularly preferably 0 to 1. 0.4, c1 is 0 to 0.3, preferably 0 to 0.2, d1 is 0 to 0.1, preferably 0 to 0.05, and a1 + b1 + c1 + d1 is 1.
When a1 is less than 0.25 (the content of (R ¹ SiO _3/2 ) units is less than 25 mol%), crack resistance and the like are insufficient.

  The molecular weight of such component (A) is not limited, but the weight average molecular weight (Mw) by GPC measurement (in terms of standard polystyrene) using a THF solvent is preferably 500 to 10,000, more preferably 700 to 5,000, particularly preferably 1,000 to 3,000.

<(B) component>
Component (B) is a component for imparting flexibility and reinforcement to a cured product obtained by curing the present composition, and is an organopolysiloxane represented by the following average unit formula (2).
(R ² SiO _3/2 ) a ₂ (R ² ₂ SiO _2/2 ) _{b 2} (R ² ₃ SiO _1/2 ) _c ² (X ² O _1/2 ) _{d 2} (2)
{In the formula, R ² may be the same or different and is a substituted or unsubstituted monovalent hydrocarbon group (provided that 0.001 to 20 mol% of R ² is an alkenyl group, and 10 mol% of R ² The above is an aryl group), and X ² is a hydrogen atom or an alkyl group. a2 is 0.005 to 0.1, b2 is 0.5 to 0.95, c2 is 0.005 to 0.1, d2 is 0 to 0.1, and a2 + b2 + c2 + d2 is 1. }

Examples of the alkenyl group in R ² include a vinyl group, an allyl group, a butenyl group, a pentenyl group, and a hexenyl group, and a vinyl group is particularly preferable. The content of alkenyl groups in R ² is 0.001 to 20 mol%, preferably from 0.003 to 10 mol%, particularly preferably from 0.01 to 5 mol%. If it is less than 0.001 mol%, the curability of the composition becomes insufficient, and if it exceeds 20 mol%, the cured product becomes brittle and crack resistance decreases.

Moreover, examples of the aryl group in R ² include a phenyl group, a tolyl group, a xylyl group, and a naphthyl group, and a phenyl group is particularly preferable. The content of aryl groups in R ² is 10 mol% or more, preferably 15 to 80 mol%, particularly preferably 30 to 70 mol%. The light transmittance of hardened | cured material falls that it is less than 10 mol%. Moreover, if it is 30 mol% or more, while being excellent in a refractive index and light transmittance, it will become the thing which was further excellent in crack resistance.

Examples of the silicon atom-bonded organic group other than the alkenyl group and aryl group in R ² include alkyl groups such as methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, heptyl group; benzyl group, phenethyl group Aralkyl groups such as groups; substituted or unsubstituted monovalent hydrocarbon groups such as halogenated alkyl groups such as chloromethyl group, 3-chloropropyl group, 3,3,3-trifluoropropyl group, etc. A methyl group is preferred.

Further, in the above average unit formula (2), X ² is a hydrogen atom or an alkyl group, examples of the alkyl group, the same groups as those exemplified as R ² are exemplified, in particular, a methyl group, an ethyl group Preferably there is.

Further, a2 is 0.005 to 0.1, preferably 0.01 to 0.05, particularly preferably 0.015 or more and less than 0.05, and b2 is 0.5 to 0.95, preferably 0.00. 6 to 0.9, c2 is 0.005 to 0.1, preferably 0.01 to 0.1, d2 is 0 to 0.1, preferably 0 to 0.05, and a1 + b1 + c1 + d1 is 1.
When a2 is less than 0.005 (content of (R ¹ SiO _3/2 ) unit is less than 0.5 mol%), adhesion to the substrate and crack resistance become insufficient, and exceeds 0.1 And flexibility is insufficient.

で表される単位構造を含むことが好ましく、（Ｒ^２ _２ＳｉＯ_２／２）_ｂ２単位の１０モル％以上、特に５０モル％以上が上記単位構造であることが好ましい。
上記単位構造を含有すると、より耐クラック性や透明性に優れた硬化物を得ることができる。 In addition, in the composition of the present invention, the component (B) is particularly

It is preferable that 10 mol% or more, and especially 50 mol% or more of the (R ² ₂ SiO _2/2 ) _b2 unit is the unit structure.
When the unit structure is contained, a cured product having more excellent crack resistance and transparency can be obtained.

  The molecular weight of such component (B) is not limited, but the weight average molecular weight (Mw) by GPC measurement (in terms of standard polystyrene) using a THF solvent is preferably 1,000 to 30,000, more preferably. 2,000 to 20,000, particularly preferably 4,000 to 15,000.

  The viscosity of the organopolysiloxane of component (B) is preferably 0.5 to 10,000 mPa · s at 25 ° C., more preferably 10 to 6,000 mPa · s.

（式中、Ａはメチル基又はフェニル基である。ｂ２’，ｂ２’’は０以上の正数で、ｂ２’＋ｂ２’’＝ｂ２である。ｃ２’は０を超える正数、ｃ２’’は０以上の正数で、ｃ２’＋ｃ２’’＝ｃ２である。） An organopolysiloxane represented by the following formula is preferred.

(In the formula, A is a methyl group or a phenyl group. B2 ′ and b2 ″ are positive numbers of 0 or more, and b2 ′ + b2 ″ = b2. C2 ′ is a positive number exceeding 0, c2 ″. Is a positive number of 0 or more, and c2 ′ + c2 ″ = c2.)

A specific structure is shown below.

<(C) component>
(C) component is the following average composition formula (3)
R ′ _{a ′} H _{b ′} SiO _{[(4-a′-b ′) / 2]} (3)
(In the formula, R ′ is a substituted or unsubstituted monovalent hydrocarbon group which may be the same or different except for an aliphatic unsaturated hydrocarbon group. A ′ and b ′ are 0.7 ≦ a ′. ≦ 2.1, 0.01 ≦ b ′ ≦ 1.0, and 0.8 ≦ a ′ + b ′ ≦ 2.7.
The total of R ′ and H bonded to a silicon atom having at least 2, preferably 3 or more Si—H bonds (that is, a hydrogen atom bonded to a silicon atom) in one molecule 5 mol% or more is a phenyl group, preferably a linear chain having a viscosity at 25 ° C. of 1,000 mPa · s or less, usually 0.5 to 1,000 mPa · s, more preferably 1 to 500 mPa · s. Organohydrogenpolysiloxane.

  Here, R ′ is preferably a substituted or unsubstituted monovalent hydrocarbon group having 1 to 20 carbon atoms, particularly preferably 1 to 10 which may be the same or different except for an aliphatic unsaturated hydrocarbon group. Specific examples of such hydrocarbon groups include methyl groups, ethyl groups, propyl groups, isopropyl groups, butyl groups, tert-butyl groups, hexyl groups and other alkyl groups, cyclohexyl groups and other cycloalkyl groups, and the like. Saturated hydrocarbon group, aryl group such as phenyl group and tolyl group, aralkyl group such as benzyl group and phenylethyl group, halogen-substituted hydrocarbon group such as 3,3,3-trifluoropropyl group, cyano-substituted hydrocarbon group Etc.

  Further, a ′ and b ′ are 0.7 ≦ a ′ ≦ 2.1, preferably 1.0 ≦ a ′ ≦ 1.8, 0.01 ≦ b ′ ≦ 1.0, preferably 0.02 ≦ b. '≦ 1.0, more preferably 0.10 ≦ b ′ ≦ 1.0, and 0.8 ≦ a ′ + b ′ ≦ 2.7, preferably 1.01 ≦ a ′ + b ′ ≦ 2.4, and more. Preferably, it is a positive number satisfying 1.6 ≦ a ′ + b ′ ≦ 2.2, and if b ′ is less than 0.01, sufficient hardness as a silicone resin cannot be obtained.

In this case, the organohydrogenpolysiloxane of the component (C) is composed of all R ′ and H (hydrogen) bonded to silicon atoms in view of compatibility with the components (A) and (B) and the physical properties of the cured product. Those having 5 mol% or more of the atoms) are phenyl groups, and those having 10 to 50 mol% of phenyl groups are preferably used. Alternatively, an organohydrogenpolysiloxane in which 15% by mole or more, usually 15 to 70% by mole, preferably 20 to 50% by mole, of all R ′ and H (hydrogen atoms) bonded to a silicon atom is a phenyl group, and silicon A weight ratio of less than 15 mol% of all R ′ bonded to atoms and H (hydrogen atom), usually from 0 to 14 mol%, particularly from 1 to 10 mol% of a phenyl group is a 1: 9 weight ratio. Organohydrogenpolysiloxane mixtures mixed in a ratio of ˜9: 1, particularly 2: 8 to 8: 2, can also be used suitably.
When R ′ is other than a phenyl group, it is preferably a methyl group.

  The blending amount of the organohydrogenpolysiloxane of the component (C) is preferably 1 to 200 parts by weight, preferably 5 to 80 parts by weight with respect to 100 parts by weight of the component (A) + (B). However, if it is less than 1 part by mass, the curability becomes insufficient, and if it exceeds 200 parts by mass, sufficient hardness and strength cannot be obtained.

  The organohydrogenpolysiloxane of component (C) has a molar ratio of silicon-bonded hydrogen atoms (ie, SiH groups) in component (C) to alkenyl groups in component (A) + (B) is 0. It is more preferable to mix | blend in the quantity used as 5-5 mol / mol, especially 1-3 mol / mol.

<(D) component>
The (D) component hydrosilylation reaction catalyst is a catalyst for promoting the hydrosilylation reaction between the alkenyl group in the (A) component and the (B) component and the silicon atom-bonded hydrogen atom in the (C) component. is there. Examples of such component (D) include platinum-based catalysts, rhodium-based catalysts, and palladium-based catalysts, and platinum-based catalysts are preferred because they can significantly accelerate the curing of the composition. Examples of the platinum-based catalyst include platinum fine powder, chloroplatinic acid, an alcohol solution of chloroplatinic acid, a platinum-alkenylsiloxane complex, a platinum-olefin complex, and a platinum-carbonyl complex, and in particular, a platinum-alkenylsiloxane complex. It is preferable. Examples of the alkenyl siloxane include 1,3-divinyl-1,1,3,3-tetramethyldisiloxane, 1,3,5,7-tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane, Examples include alkenyl siloxanes in which a part of the methyl groups of these alkenyl siloxanes are substituted with groups such as ethyl groups and phenyl groups, and alkenyl siloxanes in which the vinyl groups of these alkenyl siloxanes are substituted with groups such as allyl groups and hexenyl groups. . In particular, 1,3-divinyl-1,1,3,3-tetramethyldisiloxane is preferred because the stability of this platinum-alkenylsiloxane complex is good.

  Further, since the stability of this platinum-alkenylsiloxane complex can be improved, 1,3-divinyl-1,1,3,3-tetramethyldisiloxane, 1,3-diallyl-1,1 can be added to this complex. , 3,3-tetramethyldisiloxane, 1,3-divinyl-1,3-dimethyl-1,3-diphenyldisiloxane, 1,3-divinyl-1,1,3,3-tetraphenyldisiloxane, , 3,5,7-tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane is preferably added, and alkenylsiloxane such as dimethylsiloxane oligomer is preferably added. It is preferable.

  The content of the component (D) is not limited as long as it is an amount (catalytic amount) that accelerates the curing (hydrosilylation reaction) of the composition, and specifically, the component (A) and (B ) It is preferable that the amount of metal atoms in this component is in the range of 0.01 to 500 ppm in terms of mass unit with respect to the total of components, and moreover in the amount of 0.05 to 100 ppm. It is preferable that the amount be within a range of 0.01 to 50 ppm. This is because when the content of the component (D) is in the above range, the present composition is sufficiently cured, and there is no possibility of causing problems such as coloring in the obtained cured product, and it is economical. is there.

<Optional component>
In this composition, as other optional components, 2-methyl-3-butyn-2-ol, 3,5-dimethyl-1-hexyn-3-ol, 2-phenyl-3-butyn-2-ol, etc. Alkyne alcohols; enyne compounds such as 3-methyl-3-penten-1-yne and 3,5-dimethyl-3-hexen-1-yne; 1,3,5,7-tetramethyl-1,3,5 , 7-tetravinylcyclotetrasiloxane, 1,3,5,7-tetramethyl-1,3,5,7-tetrahexenylcyclotetrasiloxane, benzotriazole, and other reaction inhibitors may be contained. Although content of this reaction inhibitor is not limited, It is preferable to exist in the range of 0.0001-5 mass parts with respect to a total of 100 mass parts of (A) component and (B) component.

In addition, the composition may contain an adhesion-imparting agent for improving the adhesion. The adhesion-imparting agent is preferably an organosilicon compound having at least one, preferably two or more alkoxy groups bonded to silicon atoms in one molecule. Examples of the alkoxy group include a methoxy group, an ethoxy group, a propoxy group, a butoxy group, and a methoxyethoxy group, and a methoxy group is particularly preferable. Examples of the group other than the alkoxy group bonded to the silicon atom of the organosilicon compound include the alkyl group, the alkenyl group, the aryl group, the aralkyl group, and the halogenated alkyl group exemplified as R ^{1 and the} like. Substituted or unsubstituted monovalent hydrocarbon group; glycidoxyalkyl group such as 3-glycidoxypropyl group, 4-glycidoxybutyl group; 2- (3,4-epoxycyclohexyl) ethyl group, 3- ( 3,4-epoxycyclohexyl) epoxycyclohexylalkyl group such as propyl group; epoxy group-containing monovalent organic group such as oxiranylalkyl group such as 4-oxiranylbutyl group and 8-oxiranyloctyl group; An acrylic group-containing monovalent organic group such as a methacryloxypropyl group; a hydrogen atom is exemplified. Specific examples include silane coupling agents such as epoxy group-containing silane coupling agents and (meth) acryl group-containing silane coupling agents, and partial hydrolysis condensates thereof (oligomers of silane coupling agents).

  More specifically, silane compounds such as 3-glycidoxypropyltrimethoxysilane, 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, and 3-methacryloxypropyltrimethoxysilane; silicon atoms in one molecule Siloxane compound having at least one bonded alkenyl group or silicon atom bonded hydrogen atom and silicon atom bonded alkoxy group, silane compound having at least one silicon atom bonded alkoxy group or siloxane compound and silicon atom bonded hydroxy in one molecule Examples thereof include a mixture of a group and a siloxane compound each having at least one silicon-bonded alkenyl group, methyl polysilicate, ethyl polysilicate, and epoxy group-containing ethyl polysilicate.

The adhesion-imparting agent is preferably a low-viscosity liquid, and the viscosity is not limited, but is preferably in the range of 1 to 500 mPa · s at 25 ° C. An adhesion-imparting agent as shown in the following formula may be added.

  Moreover, in the said composition, although content of this adhesion imparting agent is not limited, It is preferable that it is 0.01-10 mass parts with respect to a total of 100 mass parts of (A) component and (B) component.

  Further, in the present composition, as long as the object of the present invention is not impaired, as other optional components, inorganic fillers such as silica, glass, alumina and zinc oxide; fine organic resin powders such as polymethacrylate resin; You may contain dye, a pigment, a flame-retarding agent, a solvent, etc.

Further, the composition is preferably cured to form a cured product having a hardness specified by JIS of 30 or more, particularly 30 to 90, according to JIS.
In this way, when cured, for example, if a cured product of 30 or more is formed by Shore D, even when used in a semiconductor device or the like, it is hardly affected by external stress, and dust and the like adhere as much as possible. It becomes difficult.

  Moreover, in order to give sufficient reliability to the semiconductor device which has the semiconductor element coat | covered with the hardened | cured material of the composition, this composition is the refractive index (25 nm) of the hardened | cured material obtained by hardening | curing. ° C) is 1.5 or more, and the light transmittance (25 ° C) of the cured product is preferably 80% or more.

  This refractive index can be measured by, for example, an Abbe refractometer. At this time, the refractive index at an arbitrary wavelength can be measured by changing the wavelength of the light source in the Abbe refractometer. Moreover, this light transmittance can be calculated | required by measuring the hardened | cured material of optical path length 2.0mm with a spectrophotometer, for example.

  Moreover, it is preferable that the ultraviolet-ray transmittance (25 degreeC) in the wavelength of 200 nm-250 nm of the hardened | cured material obtained by hardening | curing this composition is 10% or less. This is to prevent deterioration of the material constituting the semiconductor device when the semiconductor device in which the semiconductor element is coated with the cured product of the composition receives ultraviolet rays having a short wavelength of 200 nm to 250 nm. . This ultraviolet transmittance can be determined, for example, by measuring a cured product having an optical path length of 2.0 mm with a spectrophotometer.

  The composition is cured at room temperature or by heating, but is preferably heated to cure quickly. The heating temperature is preferably in the range of 50 to 200 ° C.

  A cured product obtained by curing the present composition can be obtained from an elastomer, for example, a gel or a flexible rubber to an elastic resin. Such a composition can be used as an electrical / electronic adhesive, a potting agent, a protective coating agent, and an underfill agent. In particular, since it has a high light transmittance, it can adhere to semiconductor elements for optical applications. Suitable as an agent, potting agent, protective coating agent, and underfill agent.

The present invention further provides a semiconductor device using such an addition-curable silicone composition of the present invention.
Hereinafter, the semiconductor device of the present invention will be described with reference to the drawings, but the present invention is not limited thereto.

FIG. 1 is a schematic sectional view showing an example (in this case, LED) of the semiconductor device of the present invention.
In the semiconductor device 1 of the present invention, a semiconductor chip 4 is die-bonded on a package 3 on which a silver-plated substrate 2 is formed, and the semiconductor chip 4 is wire-bonded by a bonding wire 5.
And the semiconductor chip 4 is coat | covered with the hardened | cured material 6 of the addition-curable silicone composition of this invention mentioned above.
The semiconductor chip 4 is coated by applying the addition-curable silicone composition 6 of the present invention described above and curing the addition-curable silicone composition 6 by heating. Of course, it may be cured by a known curing method under other known curing conditions.

  In this case, from the viewpoint of being hardly affected by external stress and minimizing the adhesion of dust and the like, the addition-curable silicone composition 6 has a hardness specified by JIS of 30 or more in Shore D by curing. It is preferable to form a cured product.

  The addition curable silicone composition of the present invention forms a cured product having a high refractive index, high light transmittance, high adhesion to a substrate, excellent crack resistance, and low gas permeability. The semiconductor device of the present invention using such a composition of the present invention has excellent reliability, and is particularly suitable as a diode, a light emitting diode (LED) or the like.

EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated concretely, this invention is not restrict | limited to the following Example etc.
In addition, the viscosity in an Example is the value measured using the rotational viscometer in 25 degreeC. The properties of the addition curable silicone composition and the cured product thereof were measured as follows.

Hardened product of cured product The cured product was prepared by heating the addition-curable silicone composition in a hot air circulating oven at 150 ° C. for 3 hours. The hardness of the cured product was measured using a Shore D hardness meter.

Refractive index addition curable silicone composition of cured product was cured by heating for 3 hours in a 150 ° C. hot air circulation oven, and the refractive index at 25 ° C. of the cured product was measured using an Abbe refractometer. did. In addition, visible light (589 nm) was used as a light source used for the measurement.

Light transmittance of cured product A cured product (optical path length 2.0 mm) produced by curing an addition-curable silicone composition by heating in a hot air circulation oven at 150 ° C. for 3 hours at a wavelength of 400 nm at 25 ° C. The transmittance was measured.

Heat resistance of cured product The result obtained in the above [Light transmittance of cured product] is 100, and this cured product is heated in a hot air circulation oven at 150 ° C. for 500 hours, and then the cured product is taken out and light transmittance is 100. It was measured how much it fell compared.

Crack after endurance of cured product A package prepared as shown in FIG. 1 and cured by heating at 150 ° C. for 4 hours, heat at a cycle of {−40 ° C. (30 minutes), 100 ° C. (30 minutes)} Place in an impact tester, and after 100 cycles, observe the package with a magnifying microscope. If there is a crack in the cured product, ×, if there is no crack, ○, if it is not clear whether there is a crack, Δ. did.

A cured product having a thickness of 1 mm, which was prepared by curing an oxygen gas permeable addition curable silicone composition of the cured product by heating in a hot air circulation oven at 150 ° C. for 3 hours, was measured using an oxygen gas permeable device.

（ケイ素原子結合ビニル基の含有率＝４．３モル％、ケイ素原子結合全有機基中のケイ素原子結合フェニル基の含有率＝４３モル％）２５質量部、式：
Ｈ（ＣＨ_３）_２ＳｉＯ（Ｃ_６Ｈ_５）_２ＳｉＯＳｉ（ＣＨ_３）_２Ｈ
で表される有機ケイ素化合物２１質量部、白金の１，３−ジビニル−１，１，３，３−テトラメチルジシロキサン錯体（本組成物において、本錯体中の白金金属が質量単位で３０ｐｐｍとなる量）、接着付与剤として下記構造式

で表されるＳｉＨ含有化合物１．０質量部を均一に混合して、粘度４，７００ｍＰａ・ｓである付加硬化型シリコーン組成物を調製した。 [Example 1]
Average unit formula:
(C ₆ H ₅ SiO _3/2 ) _0.75 [(CH ₂ ═CH) (CH ₃ ) SiO] _0.25
A branched chain organopolysiloxane represented by the following formula: {Property = solid (25 ° C.), silicon atom-bonded vinyl group content in silicon atom-bonded all organic groups = 20 mol%, silicon atom-bonded all organic groups in Content of silicon atom-bonded phenyl group = 60 mol%, weight average molecular weight in terms of standard polystyrene = 2400} 50 parts by mass, viscosity 6,000 mPa · s, branched molecular chain terminal dimethylvinylsiloxy group-capped phenylmethylpoly Siloxane (the following formula)

(Content of silicon atom-bonded vinyl group = 4.3 mol%, content of silicon atom-bonded phenyl group in all silicon atom-bonded organic groups = 43 mol%) 25 parts by mass, formula:
H (CH ₃ ) ₂ SiO (C ₆ H ₅ ) ₂ SiOSi (CH ₃ ) ₂ H
21 parts by mass of an organosilicon compound represented by the formula: 1,3-divinyl-1,1,3,3-tetramethyldisiloxane complex of platinum (in the present composition, platinum metal in the complex is 30 ppm by mass) The following structural formula as an adhesion promoter

An addition curable silicone composition having a viscosity of 4,700 mPa · s was prepared by uniformly mixing 1.0 part by mass of the SiH-containing compound represented by the formula:

  The properties of this addition-curable silicone composition and its cured product were measured. These results are shown in Table 1. Moreover, LED was produced using this addition-curable silicone composition. Table 1 shows the evaluation results of the reliability of these semiconductor devices.

（ケイ素原子結合ビニル基の含有率＝３．３モル％、ケイ素原子結合全有機基中のケイ素原子結合フェニル基の含有率＝５６モル％）２５質量部、式：
Ｈ（ＣＨ_３）_２ＳｉＯ（Ｃ_６Ｈ_５）_２ＳｉＯＳｉ（ＣＨ_３）_２Ｈ
で表される分子鎖両末端ジメチルハイドロジェンシルエチニル基封鎖有機ケイ素化合物１５質量部、接着付与剤として下記構造式

で表されるシラン化合物２．０質量部、白金の１，３−ジビニル−１，１，３，３−テトラメチルジシロキサン錯体（本組成物において、本錯体中の白金金属が質量単位で２．５ｐｐｍとなる量）を均一に混合して、粘度６，５００ｍＰａ・ｓである付加硬化型シリコーン組成物を調製した。 [Example 2]
Average unit formula:
(C ₆ H ₅ SiO _3/2 ) _0.8 [(CH ₂ ═CH) (CH ₃ ) ₂ SiO _1/2 ] _0.2
A branched chain organopolysiloxane represented by the formula {characteristic = solid (25 ° C.), silicon atom-bonded vinyl group content in silicon atom-bonded all organic groups = 14 mol%, silicon atom-bonded all organic groups in Content of silicon atom-bonded phenyl group = 57 mol%, standard polystyrene equivalent weight average molecular weight = 1,600} 55 parts by mass, viscosity 10,000 mPa · s, branched molecular chain terminal dimethylvinylsiloxy group-capped diphenyl Dimethylpolysiloxane (following formula)

(Content of silicon atom-bonded vinyl group = 3.3 mol%, content of silicon atom-bonded phenyl group in all silicon atom-bonded organic groups = 56 mol%) 25 parts by mass, formula:
H (CH ₃ ) ₂ SiO (C ₆ H ₅ ) ₂ SiOSi (CH ₃ ) ₂ H
15 parts by mass of a dimethylhydrogensilethynyl group-blocked organosilicon compound having both molecular chains represented by the following structural formula:

2.0 parts by mass of a silane compound represented by the formula: 1,3-divinyl-1,1,3,3-tetramethyldisiloxane complex of platinum (in the present composition, platinum metal in the complex is 2 by mass unit) 0.5 ppm) was uniformly mixed to prepare an addition-curable silicone composition having a viscosity of 6,500 mPa · s.

  The properties of this addition-curable silicone composition and its cured product were measured. These results are shown in Table 1. Moreover, LED was produced using this addition-curable silicone composition. Table 1 shows the evaluation results of the reliability of these semiconductor devices.

[Comparative Example 1]
Viscosity is 3,500 mPa · s, linear molecular chain both ends dimethylvinylsiloxy group-blocked methylphenylpolysiloxane (content of silicon atom-bonded vinyl group = 0.20 mol%, in silicon atom-bonded all organic groups) (Content of silicon atom-bonded phenyl group = 49 mol%) 60 parts by mass, average unit formula:
(C ₆ H ₅ SiO _3/2 ) _0.75 [(CH ₂ ═CH) (CH ₃ ) ₂ SiO _1/2 ] _0.25
A branched chain organopolysiloxane represented by the following formula: {Property = solid (25 ° C.), silicon atom-bonded vinyl group content in silicon atom-bonded all organic groups = 20 mol%, silicon atom-bonded all organic groups in Content of silicon-bonded phenyl group = 60 mol%, weight average molecular weight in terms of standard polystyrene = 1,600} 40 parts by mass, formula:
H (CH ₃ ) ₂ SiO [(CH ₃ ) ₂ SiO] ₄ Si (CH ₃ ) ₂ H
24 parts by mass of dimethylpolysiloxane represented by the formula: 1,3-divinyl-1,1,3,3-tetramethyldisiloxane complex of platinum (in the present composition, platinum metal in the complex is 30 ppm by mass) Are uniformly mixed to prepare an addition-curable silicone composition having a viscosity of 2,460 mPa · s.

  The properties of this addition-curable silicone composition and its cured product were measured. These results are shown in Table 1. Moreover, LED was produced using this addition-curable silicone composition. Table 1 shows the evaluation results of the reliability of these semiconductor devices.

[Comparative Example 2]
Average unit formula:
(C ₆ H ₅ SiO _3/2 ) _0.75 [(CH ₂ ═CH) (CH ₃ ) ₂ SiO _1/2 ] _0.25
A branched chain organopolysiloxane represented by the following formula: {Property = solid (25 ° C.), silicon atom-bonded vinyl group content in silicon atom-bonded all organic groups = 20 mol%, silicon atom-bonded all organic groups in Content of silicon atom-bonded phenyl group = 60 mol%, standard polystyrene equivalent weight average molecular weight = 1,600} 55 parts by mass, viscosity 950 mPa · s, average unit formula:
(C ₆ H ₅ SiO _3/2 ) _0.60 [(CH ₃ ) ₂ HSiO _1/2 ] _0.40
Branched chain organopolysiloxane (content of silicon atom-bonded hydrogen atoms in all silicon atom-bonded groups = 22 mol%, content of silicon atom-bonded phenyl groups in all silicon atom-bonded groups = 33 mol) %, Standard polystyrene equivalent weight average molecular weight = 1,100) 12 parts by mass, viscosity 3,500 mPa · s, linear molecular chain dimethylvinylsiloxy group-blocked methylphenylpolysiloxane (silicon atom-bonded vinyl group) Content = 0.20 mol%, silicon atom bonded phenyl group content in all silicon atom bonded organic groups = 49 mol%) 50 parts by mass, platinum 1,3-divinyl-1,1,3,3 -Tetramethyldisiloxane complex (in this composition, the amount of platinum metal in the complex is 2.5 ppm by mass) is uniformly mixed, and the viscosity is 3,500 mPa · s. The that addition-curable silicone composition was prepared.

  The properties of this addition-curable silicone composition and its cured product were measured. These results are shown in Table 1. Moreover, LED was produced using this addition-curable silicone composition. Table 1 shows the evaluation results of the reliability of these semiconductor devices.

[Comparative Example 3]
Average unit formula:
(C ₆ H ₅ SiO _3/2 ) _0.75 [(CH ₂ ═CH) (CH ₃ ) ₂ SiO _1/2 ] _0.25
A branched chain organopolysiloxane represented by the following formula: {Property = solid (25 ° C.), silicon atom-bonded vinyl group content in silicon atom-bonded all organic groups = 20 mol%, silicon atom-bonded all organic groups in Content of silicon-bonded phenyl group = 60 mol%, standard polystyrene equivalent weight average molecular weight = 1,600} 45 parts by mass, viscosity 3,500 mPa · s, linear molecular chain both ends dimethylvinylsiloxy group Blocked methylphenylpolysiloxane (content of silicon atom-bonded vinyl group = 0.20 mol%, content of silicon atom-bonded phenyl group in all silicon atom-bonded organic groups = 49 mol%) 55 parts by mass, formula:
H (CH ₃ ) ₂ SiO [CH ₃ (C ₆ H ₅ ) SiO] ₄ Si (CH ₃ ) ₂ H
Dimethylhydrogensiloxy group-blocked methylphenylpolysiloxane 24 parts by weight of a molecular chain represented by the following formula: 1,3-divinyl-1,1,3,3-tetramethyldisiloxane complex of platinum (in this composition, An addition curable silicone composition having a viscosity of 1,700 mPa · s was prepared by uniformly mixing platinum metal in the complex in an amount of 2.5 ppm in terms of mass unit.

  The properties of this addition-curable silicone composition and its cured product were measured. These results are shown in Table 1. Moreover, LED was produced using this addition-curable silicone composition. Table 1 shows the evaluation results of the reliability of these semiconductor devices.

[Comparative Example 4]
The branched organopolysiloxane of Example 1 is represented by the average unit formula:
(C ₆ H ₅ SiO _3/2 ) _0.05 (CH ₃ SiO _3/2 ) _0.70 [(CH ₂ ═CH) (CH ₃ ) ₂ SiO _1/2 ] _0.25 {Property = Solid ( 25 ° C.), silicon atom-bonded vinyl group content in the silicon atom-bonded all organic group = 16.7 mol%, silicon atom-bonded phenyl group content in the silicon atom-bonded all organic group = 3.3 mol%, An addition-curable silicone composition having a viscosity of 2,300 mPa · s was prepared in the same manner as in Example 1 except that the weight average molecular weight in terms of standard polystyrene was 2,100}.

The properties of this addition-curable silicone composition and its cured product were measured. These results are shown in Table 1. Moreover, LED was produced using this addition-curable silicone composition. Table 1 shows the evaluation results of the reliability of these semiconductor devices.

  As shown in Table 1, in Examples 1 and 2, the hardness of the cured product was sufficient, the refractive index, the light transmittance, and the heat resistance of the cured product were good, and no cracks were found in the cured product. . Moreover, it was excellent also in gas barrier property. Furthermore, peeling due to the catalyst poison did not occur and the adhesiveness was high.

  On the other hand, in Comparative Examples 2 to 4, although the hardness was sufficient, the occurrence of cracks was observed, and Comparative Example 1 in which the presence or absence of cracks was unclear was also inferior in heat resistance. In addition, all of Comparative Examples 1 to 4 were high in gas permeability and easily corroded the substrate. Furthermore, peeling due to the catalyst poison has occurred.

  From the above, the addition-curable silicone composition of the present invention has a high refractive index, high light transmittance, high adhesion to the substrate, excellent crack resistance, and low gas permeability. Therefore, it was proved to be suitable for various optical applications.

  The present invention is not limited to the above embodiment. The above-described embodiment is an exemplification, and the present invention has substantially the same configuration as the technical idea described in the claims of the present invention, and any device that exhibits the same function and effect is the present invention. It is included in the technical scope of the invention.

  In the above examples, the addition-curable silicone composition of the present invention was used as a potting agent for semiconductor elements. However, the addition-curable silicone composition of the present invention has a particularly high optical transmittance, so that other optical components can be used. It is suitable as an adhesive, protective coating agent, underfill agent, etc. for semiconductor elements for use, and of course, it can also be used as an adhesive for electric and electronic, potting agent, protective coating agent, underfill agent, etc. it can.

DESCRIPTION OF SYMBOLS 1 ... Semiconductor device, 2 ... Silver plating board | substrate, 3 ... Package, 4 ... Semiconductor chip,
5 ... bonding wire, 6 ... addition-curable silicone composition (cured product thereof).

Claims (8)

at least,
(A) Organopolysiloxane represented by the following average unit formula (1): 100 parts by mass,
(R ¹ SiO _3/2 ) _a1 (R ¹ ₂ SiO _2/2 ) _b1 (R ¹ ₃ SiO _1/2 ) _c1 (X ¹ O _1/2 ) _d1 (1)
{In the formula, R ¹ may be the same or different and is a substituted or unsubstituted monovalent hydrocarbon group (provided that 0.1 to 50 mol% of R ¹ is an alkenyl group, and 10 mol% of R ¹ The above is an aryl group), and X ¹ is a hydrogen atom or an alkyl group. a1 is 0.25 to 1, b1 is 0 to 0.75, c1 is 0 to 0.3, d1 is 0 to 0.1, and a1 + b1 + c1 + d1 is 1. }
(B) Organopolysiloxane represented by the following average unit formula (2): 1 to 99 parts by mass,
(R ² SiO _3/2 ) a ₂ (R ² ₂ SiO _2/2 ) _{b 2} (R ² ₃ SiO _1/2 ) _c ² (X ² O _1/2 ) _{d 2} (2)
{In the formula, R ² may be the same or different and is a substituted or unsubstituted monovalent hydrocarbon group (provided that 0.001 to 20 mol% of R ² is an alkenyl group, and 10 mol% of R ² The above is an aryl group), and X ² is a hydrogen atom or an alkyl group. a2 is 0.005 to 0.1, b2 is 0.5 to 0.95, c2 is 0.005 to 0.1, d2 is 0 to 0.1, and a2 + b2 + c2 + d2 is 1. }
(C) The compound represented by the following average composition formula (3) has at least two Si—H bonds in one molecule, and 5 mol% or more of the total of R ′ and H bonded to a silicon atom is a phenyl group. Organohydrogenpolysiloxane: an amount of 1 to 200 parts by mass with respect to 100 parts by mass in total of the components (A) + (B),
R ′ _{a ′} H _{b ′} SiO _{[(4-a′-b ′) / 2]} (3)
(In the formula, R ′ is a substituted or unsubstituted monovalent hydrocarbon group which may be the same or different except for an aliphatic unsaturated hydrocarbon group. A ′ and b ′ are 0.7 ≦ a ′. ≦ 2.1, 0.01 ≦ b ′ ≦ 1.0, and 0.8 ≦ a ′ + b ′ ≦ 2.7.
And (D) a catalyst for hydrosilylation reaction: an addition-curable silicone composition comprising an amount that accelerates curing of the composition. 2. The addition-curable silicone composition according to claim 1, wherein in the component (A), the content of the aryl group of R ^{1 in} the average unit formula (1) is 30 mol% or more. The addition-curable silicone according to claim 1 or 2, wherein in the component (B), the content of the aryl group of R ^{2 in} the average unit formula (2) is 30 mol% or more. Composition.   In the component (C), 5 to 50 mol% of the total of R ′ and H bonded to the silicon atom in the average composition formula (3) is a phenyl group. The addition-curable silicone composition according to any one of the above.   The addition curing type according to any one of claims 1 to 4, wherein the cured product is cured to form a cured product having a refractive index (25 ° C) in visible light (589 nm) of 1.5 or more. Silicone composition.   The addition-curable silicone composition according to any one of claims 1 to 5, which is cured to form a cured product having a light transmittance (25 ° C) of 80% or more.   The addition-curable silicone composition according to any one of claims 1 to 6, wherein the component (B) includes a unit structure represented by the following formula.

Wherein a semiconductor element is covered by the cured product of the addition-curable silicone composition according to any one of claims 1 to 7.

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