JP6302866B2 - Addition-curing silicone composition and semiconductor device - Google Patents

Description

  The present invention relates to an addition-curable silicone composition, a cured product thereof, and a semiconductor device including the cured product. In particular, the present invention relates to an addition-curable silicone composition containing a branched organohydrogenpolysiloxane having a short chain length siloxane branched chain.

  Addition-curable silicone resins have been used as a sealing material for sealing semiconductor elements such as LEDs since they are excellent in heat resistance, light resistance, fast curing properties and the like. For example, Patent Document 1 describes an addition-curable silicone resin that exhibits high adhesion to an LED package made of a thermoplastic resin such as PPA. Patent Document 2 describes a method for sealing an optical semiconductor element by compression molding of an addition-curable silicone resin composition.

  As described above, the addition-curable silicone resin is widely used as a semiconductor sealing material, but its characteristics are not yet satisfactory. In particular, LED encapsulants are exposed to external stresses such as changes in temperature and humidity in addition to internal stresses due to temperature changes caused by ON / OFF of the optical semiconductor device. Is also important. However, conventional addition-curable silicone resins are not sufficient for low-temperature properties and have a problem that they cannot withstand the stress of temperature change and cause cracks.

Patent Document 3 describes that a linear silicone chain has a branched structure in order to improve the low temperature characteristics of the cured product. In Patent Document 3, a branched organopolysiloxane is prepared by subjecting a mixture containing an organohydrogenpolysiloxane containing CH ₃ (H) SiO _1/2 units to an equilibration reaction using an alkali catalyst in the presence of water. A method of manufacturing is described. Patent Document 4 describes a branched organopolysiloxane obtained by polymerizing an alkoxy group-containing organopolysiloxane and a low molecular weight organopolysiloxane in the presence of an acidic or basic catalyst. However, in these production methods, the chain lengths of the main chain and the side chain cannot be controlled independently. The resulting organopolysiloxane has a long branched chain length or a network structure. For this reason, even if an attempt is made to form a desired TM branch structure, the chain lengths of the main chain and the side chain cannot be controlled independently, as in T-D _n -M (n is 5 or more) It becomes a long chain branch. Although Patent Document 5 also describes branched organopolysiloxanes, the branched chain length is long, and such organopolysiloxanes cannot sufficiently satisfy temperature change resistance.

JP 2006-256603 A JP 2006-93354 A JP 2002-348377 A JP 2001-163981 A JP 2000-351949 A

  The present invention has been made in view of the above problems, and an addition-curable silicone composition that gives a cured product having good low-temperature characteristics and excellent temperature change resistance, and a semiconductor element sealed with the cured product of the composition. Another object of the present invention is to provide a highly reliable semiconductor device.

  As a result of intensive studies, the inventors of the present invention have an addition-curable type containing a branched organohydrogenpolysiloxane represented by the following formula (2) and having a short branched chain length (ie, having 1 to 4 siloxane units). The present inventors have found that a cured product of a silicone composition provides a semiconductor device having good low-temperature and high-temperature characteristics, excellent resistance to temperature change, and high reliability.

（式中、Ｒ^３は、互いに独立に、置換または非置換の、炭素数１〜８の飽和炭化水素基又は炭素数６〜１０の芳香族炭化水素基であり、Ｒ^４は、互いに独立に、水素原子、及び置換または非置換の、炭素数１〜８の飽和炭化水素基又は炭素数６〜１０の芳香族炭化水素基から選ばれる基であり、Ｒ^５は、互いに独立に、メチル基またはフェニル基であり、Ｒ^４で示される基の少なくとも２つは水素原子であり、ｘは０〜３の整数であり、ａは１〜５０の整数であり、ｂは０〜３００の整数であり、但し１≦ａ＋ｂ≦３５０であり、括弧内にあるシロキサン単位はランダム構造を形成していてもブロック単位を形成していても良い）
（Ａ）成分中にあるアルケニル基の個数に対する（Ｂ）成分中にあるヒドロシリル基の個数の比が０．４〜４となる量、及び
（Ｃ）ヒドロシリル化触媒 触媒量。
さらに本発明は該シリコーン組成物の硬化物を備えた半導体装置を提供する。
That is, this invention provides the addition-curable silicone composition containing the following (A)-(C) component.
(A) Organopolysiloxane having a network structure represented by the following formula (1) and having at least two alkenyl groups in one molecule (R ¹ ₃ SiO _1/2 ) _r (R ¹ ₂ SiO _2/2 ) _s (R ¹ SiO _3/2 ) _t (SiO _4/2 ) _u (1)
(In the formula, R ¹ is independently of each other a substituted or unsubstituted saturated hydrocarbon group having 1 to 8 carbon atoms or an aromatic hydrocarbon group having 6 to 10 carbon atoms and an alkenyl group having 2 to 3 carbon atoms. A group selected, wherein at least two of R ¹ are alkenyl groups, r is an integer of 1 to 75 , s is an integer of 0 to 200 , t is an integer of 0 to 200 , u Is an integer of 0 to 200, 1 ≦ t + u ≦ 200 , 2 ≦ r + s + t + u ≦ 400 , provided that r, s, t and u have at least two alkenyl groups in one molecule of the organopolysiloxane. Value)
(B) A branched organohydrogenpolysiloxane represented by the following formula (2) having at least two hydrosilyl groups in one molecule

(Wherein R ³ are each independently a substituted or unsubstituted saturated hydrocarbon group having 1 to 8 carbon atoms or an aromatic hydrocarbon group having 6 to 10 carbon atoms, and R ⁴ are independently , A hydrogen atom, and a substituted or unsubstituted group selected from a substituted or unsubstituted saturated hydrocarbon group having 1 to 8 carbon atoms or an aromatic hydrocarbon group having 6 to 10 carbon atoms, and R ⁵ is independently a methyl group Or a phenyl group, at least two of the groups represented by R ⁴ are hydrogen atoms, x is an integer of 0 to 3, a is an integer of 1 to 50 , and b is an integer of 0 to 300. Yes, provided that 1 ≦ a + b ≦ 350 , and the siloxane unit in parentheses may form a random structure or a block unit)
(A) An amount in which the ratio of the number of hydrosilyl groups in the component (B) to the number of alkenyl groups in the component is 0.4 to 4, and (C) a hydrosilylation catalyst catalyst amount.
Furthermore, this invention provides the semiconductor device provided with the hardened | cured material of this silicone composition.

  The addition-curable silicone composition of the present invention includes a composition containing a linear organopolysiloxane having the same chain length, and a branched organopolysiloxane having a long branched chain (particularly, having 5 or more siloxane units). A cured product having a glass transition temperature lower than that of a composition containing siloxane is obtained. In addition, the obtained cured product has good low temperature characteristics, excellent temperature change resistance, and improved crack resistance and the like. Therefore, a semiconductor device excellent in reliability can be provided by sealing the semiconductor element with the cured product of the addition-curable silicone composition of the present invention.

（式中、Ｒ^３は、互いに独立に、置換または非置換の、炭素数１〜１２の飽和炭化水素基又は炭素数６〜１２の芳香族炭化水素基であり、Ｒ^４は、互いに独立に、水素原子、及び置換または非置換の、炭素数１〜１２の飽和炭化水素基又は炭素数６〜１２の芳香族炭化水素基から選ばれる基であり、Ｒ^５は、互いに独立に、置換または非置換の、炭素数１〜６の飽和炭化水素基又は炭素数６〜１２の芳香族炭化水素基であり、Ｒ^４で示される基の少なくとも２つは水素原子であり、ｘは０〜３の整数であり、ａは１〜１００の整数であり、ｂは０〜３００の整数であり、但し１≦ａ＋ｂ≦４００であり、括弧内にあるシロキサン単位はランダム構造を形成していてもブロック単位を形成していても良い） Hereinafter, the present invention will be described in detail.
(B) Branched organohydrogenpolysiloxane The composition of the present invention has at least one branched chain composed of 1 to 4 siloxane units represented by the following formula (2). It contains siloxane.

(Wherein R ³ are each independently a substituted or unsubstituted saturated hydrocarbon group having 1 to 12 carbon atoms or an aromatic hydrocarbon group having 6 to 12 carbon atoms, and R ⁴ are independently of each other. , A hydrogen atom, and a substituted or unsubstituted group selected from a substituted or unsubstituted saturated hydrocarbon group having 1 to 12 carbon atoms or an aromatic hydrocarbon group having 6 to 12 carbon atoms, and R ⁵ is independently substituted or substituted. An unsubstituted saturated hydrocarbon group having 1 to 6 carbon atoms or an aromatic hydrocarbon group having 6 to 12 carbon atoms, at least two of the groups represented by R ⁴ are hydrogen atoms, and x is 0 to 3 A is an integer of 1 to 100, b is an integer of 0 to 300, provided that 1 ≦ a + b ≦ 400, and the siloxane units in parentheses are blocked even if they form a random structure. Unit may be formed)

R ³ is independently of each other a substituted or unsubstituted, saturated hydrocarbon group having 1 to 12 carbon atoms, preferably 1 to 8 carbon atoms, or an aromatic hydrocarbon group having 6 to 12 carbon atoms, preferably 6 to 10 carbon atoms. It is. Examples of the substituted or unsubstituted saturated hydrocarbon group include an alkyl group such as a methyl group, an ethyl group, a propyl group, a butyl group, and an octyl group; a cycloalkyl group such as a cyclopentyl group and a cyclohexyl group; and a carbon atom of these groups A part or all of the hydrogen atoms bonded to is substituted with a halogen atom such as fluorine, bromine or chlorine, a cyano group, a glycidyloxy group, a methacryloxy group, a mercapto group, or an amino group, for example, a trifluoropropyl group, Halogenated monovalent hydrocarbon groups such as chloropropyl group; cyanoalkyl groups such as β-cyanoethyl group and γ-cyanopropyl group, 3-methacryloxypropyl group, 3-glycidyloxypropyl group, 3-mercaptopropyl group, 3 -Aminopropyl group is exemplified. Among these, a methyl group, a cyclohexyl group and the like are preferable, and a methyl group is particularly preferable. Examples of the substituted or unsubstituted aromatic hydrocarbon group include aryl groups such as phenyl group, tolyl group and naphthyl group, and aralkyl groups such as benzyl group, phenylethyl group and phenylpropyl group. One or all of the hydrogen atoms bonded to the carbon atoms of these groups may be substituted with a halogen atom such as fluorine, bromine or chlorine or a cyano group. Of these, a phenyl group and a tolyl group are preferable, and a phenyl group is particularly preferable.

R ⁴ is independently of each other a hydrogen atom, a substituted or unsubstituted C 1-12 saturated hydrocarbon group, preferably 1-8, and a substituted or unsubstituted C 6-12 preferably 6 Or a group selected from 10 to 10 aromatic hydrocarbon groups. Examples of the saturated hydrocarbon group and the aromatic hydrocarbon group are the same as those exemplified for R ³ above. As the group represented by R ⁴ , a hydrogen atom, a methyl group, and a phenyl group are preferable. However, at least two of the groups represented by R ⁴ are hydrogen atoms.

R ⁵ is a group selected from a substituted or unsubstituted saturated hydrocarbon group having 1 to 6 carbon atoms or an aromatic hydrocarbon group having 6 to 12 carbon atoms, independently of each other. The saturated hydrocarbon group includes an alkyl group such as a methyl group, an ethyl group, a propyl group, and a butyl group; a cycloalkyl group such as a cyclopentyl group and a cyclohexyl group; a part of hydrogen atoms bonded to carbon atoms of these groups or All substituted with halogen atoms such as fluorine, bromine, chlorine, cyano group, glycidyloxy group, methacryloxy group, mercapto group, or amino group, for example, monovalent halogenated trifluoropropyl group, chloropropyl group, etc. Examples include hydrocarbon groups; cyanoalkyl groups such as β-cyanoethyl group and γ-cyanopropyl group, 3-methacryloxypropyl group, 3-glycidyloxypropyl group, 3-mercaptopropyl group, and 3-aminopropyl group. Of the saturated hydrocarbon groups, a methyl group and a cyclohexyl group are preferable. Examples of the aromatic hydrocarbon group include the same groups as those exemplified for R ³ above, such as aryl groups such as phenyl group, tolyl group, and naphthyl group, and aralkyl groups such as benzyl group, phenylethyl group, and phenylpropyl group. It is done. Of these, a phenyl group is preferred. In particular, R ⁵ is preferably a methyl group or a phenyl group.

  x is an integer of 0 to 3, preferably 0 or 1, and particularly preferably 0. a is an integer of 1 to 100, preferably an integer of 1 to 50, more preferably an integer of 1 to 25, and more preferably an integer of 1 to 10. b is an integer of 0-300, preferably an integer of 1-230, more preferably an integer of 1-110. 1 ≦ a + b ≦ 400, preferably 1 ≦ a + b ≦ 350, more preferably 1 ≦ a + b ≦ 150, and more preferably 1 ≦ a + b ≦ 50. Moreover, it is preferable that 0.01 ≦ a / (a + b) ≦ 1.0.

In the branched organopolysiloxane, preferably at least one of the groups represented by R ³ is an aromatic hydrocarbon group. In particular, the branched organopolysiloxane has a monovalent aromatic hydrocarbon group bonded to a silicon atom in a number of 3% to 90% of the total number of all substituents bonded to the silicon atom. It is preferable to have 5% or more. The upper limit is preferably 80% or less. By having an aromatic hydrocarbon group in an amount preferably in the above range, the resulting cured product has a high refractive index and low gas permeability, and thus can be suitably used for sealing a semiconductor element. .

  The amount of component (B) added is such that the ratio of the number of hydrosilyl groups in component (B) is 0.4 to 4, preferably the total number of alkenyl groups in component (A) described below, preferably The amount is 0.6 to 3, more preferably 0.8 to 2. If it is less than the lower limit, it is not preferable because the SiH group is insufficient and curing is poor, and if it exceeds the upper limit, side reactions such as dehydrogenation due to the remaining SiH group are likely to occur. In addition, when the silicone composition of the present invention includes the component (D) described later, the ratio of the number of hydrosilyl groups in the component (B) to the total number of alkenyl groups in the component (A) and the component (D) is as described above. Any amount that falls within the range is acceptable. Further, when the silicone composition of the present invention contains the component (E) described later, the component (B) and the total number of alkenyl groups in the component (A) or (A) and (D) are The amount of the total number of hydrosilyl groups in the component (E) may be in the above range. In this case, the ratio of the component (B) to the total mass of the component (B) and the component (E) may be 5 to 95% by mass, preferably 10 to 90% by mass, and more preferably 20%. The amount is preferably 80% by mass.

（式中、Ｒ^３、Ｒ^４、及びｘは上述の通りであり、Ｒ^２は水素原子または炭素数１〜６の飽和炭化水素基である） Hereinafter, a method for producing the branched organohydrogenpolysiloxane will be described.
The branched organohydrogenpolysiloxane is composed of an organosiloxane having two hydrolyzable groups bonded to one terminal silicon atom represented by the following formula (4) as a raw material for introducing a branched chain, and the organosiloxane is subjected to a condensation reaction. It is obtained by the manufacturing method characterized by making it. The condensation reaction is preferably performed in the presence of a catalyst.

(Wherein R ³ , R ⁴ , and x are as described above, and R ² is a hydrogen atom or a saturated hydrocarbon group having 1 to 6 carbon atoms)

In the above formula (4), examples of R ² include alkyl groups such as a methyl group, an ethyl group, a propyl group, a butyl group, an isopropyl group, a hexyl group, and a cyclohexyl group. Among these, a methyl group and an ethyl group are preferable, and a methyl group is particularly preferable.

  Examples of the organopolysiloxane represented by the above formula (4) include 1,1,1,3-tetramethyl-3,3-dimethoxydisiloxane, 1-phenyl-1,1,3-trimethyl-3,3. -Dimethoxydisiloxane, 1,1-diphenyl-1,3-dimethyl-3,3-dimethoxydisiloxane, 1,1-diphenyl-1,3-dimethyl-3,3-diethoxydisiloxane, 1,1, 1-triphenyl-3-methyl-3,3-dimethoxydisiloxane, 1,1,1-trimethyl-3-phenyl-3,3-dimethoxydisiloxane, 1,3-diphenyl-1,1-dimethyl-3 , 3-dimethoxydisiloxane, 1,1-diphenyl-1-methyl-3-phenyl-3,3-dimethoxydisiloxane, 1,1,1-triphenyl-3-phenyl-3, -Dimethoxydisiloxane, 1,1-diphenyl-1-methyl-3-cyclohexyl-3,3-dimethoxydisiloxane, 1,1-diphenyl-1-methyl-3-glycidyloxypropyl-3,3-dimethoxydisiloxane 1,1-diphenyl-1-methyl-3-trifluoropropyl-3,3-dimethoxydisiloxane, 1,1,1,3,3,5-hexamethyl-5,5-dimethoxytrisiloxane, 1,1 -Diphenyl-1,3,3,5-tetramethyl-5,5-dimethoxytrisiloxane, 1,1,1-triphenyl-3,3,5-trimethyl-5,5-dimethoxytrisiloxane, 1,1 , 1,3,3-pentamethyl-5-phenyl-5,5-dimethoxytrisiloxane, 1,1,5-triphenyl-1,3,3-trimethyl 5,5-dimethoxytrisiloxane, 1,1,1,5-tetraphenyl-3,3-trimethyl-5,5-dimethoxytrisiloxane, 1,1,1,5-tetramethyl-3,3-diphenyl- 5,5-dimethoxytrisiloxane, 1,1,1-trimethyl-3,3,5-triphenyl-5,5-dimethoxytrisiloxane, 1,1,1,3,3,5-hexaphenyl-5, 5-dimethoxytrisiloxane, 1,1-diphenyl-1-methyl-3-vinyl-3,3-dimethoxydisiloxane, 1,1-diphenyl-1-methyl-3,3-dimethoxydisiloxane, 1,1- Diphenyl-1-methyl-3,3-diphenyl-5-methyl-5,5-dimethoxytrisiloxane, 1,1-diphenyl-1-methyl-3,5,7-triphenyl-3,5 7-trimethyl-9-methyl-9,9-dimethoxypentasiloxane, 1,1-diphenyl-1-methyl-3,5,7-tri (3,3,3-trifluoropropyl) -3,5,7 -Trimethyl-9-methyl-9,9-dimethoxypentasiloxane and 1,1-diphenyl-1-methyl-3- (3,3,3-trifluoropropyl) -3,3-dimethoxydisiloxane .

（式中、Ｒ^２、Ｒ^３、Ｒ^４、及びｘは上記の通りであり、ａは１〜１００の整数であり、ｂ’は０〜３００の整数であり、１≦ａ＋ｂ’≦４００である） The compound represented by the above formula (4) is subjected to a condensation reaction either alone or with another organosilicon compound to produce an organopolysiloxane represented by the following formula (5) (hereinafter referred to as a condensation reaction step). A branched organohydrogenpolysiloxane represented by the above formula (2) is produced by reacting and blocking the end of the polysiloxane with another organosilicon compound (hereinafter referred to as a terminal blocking reaction step). The condensation reaction and end-capping reaction may optionally be performed in the presence of a catalyst.

(Wherein R ² , R ³ , R ⁴ , and x are as described above, a is an integer of 1 to 100, b ′ is an integer of 0 to 300, and 1 ≦ a + b ′ ≦ 400. is there)

（式中、Ｒ^２、Ｒ^３、及びＲ^４は上記の通りであり、ｐは２〜３００の整数であり、好ましくは５〜２００の整数であり、さらに好ましくは１０〜１００の整数である。括弧内にある各シロキサン単位はブロック単位を形成していてもランダム構造を形成していてもよい） The organosilicon compound to be reacted with the compound represented by the above formula (4) is R ⁴ R ³ SiX ₂ (wherein R ⁴ and R ³ are as described above, and X is a hydrolyzable group or a halogen atom). ) And one or more selected from organic silicon compounds represented by the following formula (6).

Wherein R ² , R ³ and R ⁴ are as described above, p is an integer of 2 to 300, preferably an integer of 5 to 200, more preferably an integer of 10 to 100. (Each siloxane unit in parentheses may form a block unit or a random structure)

Examples of the organosilicon compound represented by R ⁴ R ³ SiX ₂ include chlorosilanes such as dimethyldichlorosilane, methylphenyldichlorosilane, diphenyldichlorosilane, and benzylmethyldichlorosilane; dimethyldimethoxysilane, methylphenyldimethoxysilane, and diphenyldimethoxy. Alkoxysilanes such as silane, benzylmethyldimethoxysilane, dimethyldiethoxysilane, methylphenyldiethoxysilane, diphenyldiethoxysilane, and benzylmethyldiethoxysilane; disilanols such as diphenylsilanediol, benzylmethylsilanediol, and dibenzylsilanediol Etc. Of these, dimethyldimethoxysilane, methylphenyldimethoxysilane, diphenyldimethoxysilane, diphenylsilanediol and the like are preferable.

  Examples of the organosilicon compound represented by the above formula (6) include 1,1,3,3-tetramethyl-1,3-dimethoxydisiloxane, 1,1,3,3-tetramethyldisiloxane-1, 3-diol, 1,1,3,3,5,5-hexamethyl-1,5-dimethoxytrisiloxane, 1,3,5-triphenyl-1,3,5-trimethyl-1,5-dimethoxytrisiloxane 1,3,5-triphenyl-1,3,5-trimethyltrisiloxane-1,5-diol, 1,1,3,3,5,5-hexaphenyl-1,5-dimethoxytrisiloxane, , 1,3,3,5,5-hexaphenyltrisiloxane-1,5-diol and 1,3,5-tri (trifluoropropyl) -1,3,5-trimethyltrisiloxane-1,5- Diol, and Oligomers or polymers of these compounds.

  Alternatively, silanes having a hydrocarbon group containing halogen, oxygen, nitrogen, sulfur atoms such as 3-glycidyloxypropylmethyldimethoxysilane, 3-mercaptopropylmethyldimethoxysilane, and 3-aminopropylmethyldimethoxysilane may be condensed. Good.

（式中、Ｒ^４、及びＲ^５は上記の通りであり、Ｘは加水分解性基またはハロゲン原子である）

（式中、Ｒ^４、及びＲ^５は上記の通りであり、Ｑは酸素原子または＝Ｎ−Ｈである）

（式中、Ｒ^４、Ｒ^５、及びＲ^３は上記の通りであり、ｐ’は１から１００の整数である） The compound represented by the above formula (5) is blocked at the end by further reaction with an organosilicon compound represented by the following formula (7), (8), or (9), for example. A branched organohydrogenpolysiloxane represented by the following formula can be obtained.

(Wherein R ⁴ and R ⁵ are as described above, and X is a hydrolyzable group or a halogen atom)

(Wherein R ⁴ and R ⁵ are as described above, and Q is an oxygen atom or ═N—H).

(Wherein R ⁴ , R ⁵ and R ³ are as described above, and p ′ is an integer of 1 to 100)

  In the above, X is a hydrolyzable group or a halogen atom. Examples of the halogen atom include a chlorine atom and a bromine atom. The hydrolyzable group is a group represented by -OR, and R is preferably a hydrogen atom or an alkyl group having 1 to 6 carbon atoms. Examples of the hydrolyzable group include a hydroxy group, a methoxy group, an ethoxy group, and an isopropoxy group. Of these, a chlorine atom, a hydro group, and a methoxy group are preferable, and a hydroxy group and a methoxy group are particularly preferable.

  Examples of the organosilicon compound represented by the above formula (7), (8), or (9) include 1,1,3,3-tetramethyldisiloxane and 1,3-diphenyl-1,3-dimethyldisiloxane. 1,1,3,3-tetraphenyldisiloxane, 1,3-divinyl-1,1,3,3-tetramethyldisiloxane, 1,1,3,3-tetravinyl-1,3-dimethyldi Disiloxanes such as siloxane, hexavinyldisiloxane, and 1,3-dimethyl-1,3-diphenyl-1,3-divinyldisiloxane; 1,1,3,3-tetramethyldisilazane, 1,3- Diphenyl-1,3-dimethyldisilazane, 1,1,3,3-tetraphenyldisilazane, 1,3-divinyl-1,1,3,3-tetramethyldisilazane, 1,1,3,3- Tetravinyl Silazanes such as 1,3-dimethyldisilazane, hexavinyldisilazane, and 1,3-dimethyl-1,3-diphenyl-1,3-divinyldisilazane; and 1,1,3,3,5,5 Hexamethyltrisiloxane, 1,5-divinyl-1,1,3,3,5,5-hexamethyltrisiloxane, 1,1,3,3,5,5,7,7,9,9-deca Methylpentasiloxane, 1,9-divinyl-1,1,3,3,5,5,7,7,9,9-decamethylpentasiloxane, 1,1,3,5,5-pentamethyl-3-phenyl Trisiloxane, 1,5-divinyl-1,1,3,5,5-pentamethyl-3-phenyltrisiloxane, 1,1,3,5,7,9,9-heptamethyl-3,5,7-tri Phenylpentasiloxane, 1,9-divinyl-1 1,3,5,7,9,9-heptamethyl-3,5,7-triphenylpentasiloxane, 1,1,5,5-tetramethyl-3,3-diphenyltrisiloxane, 1,5-divinyl- 1,1,5,5-tetramethyl-3,3-diphenyltrisiloxane, 1,5-dimethyl-1,3,3,5-tetraphenyltrisiloxane, 1,5-divinyl-1,5-dimethyl- 1,3,3,5-tetraphenyltrisiloxane, 1,1,9,9-tetramethyl-3,3,5,5,7,7-hexaphenylpentasiloxane, and 1,9-divinyl-1, Examples include siloxane oligomers or polymers such as 1,9,9-tetramethyl-3,3,5,5,7,7-hexaphenylpentasiloxane.

  The catalyst used in the above reaction may be at least one selected from an acid catalyst, a basic catalyst, and a metal element compound catalyst. Examples of the metal element compound catalyst include hydroxides of Group 2 elements of the periodic table, hydroxides of Group 2 elements of the periodic table, oxides of Group 2 elements of the periodic table, and periodic tables 3 to 3. A hydroxide or oxide of a metal element belonging to Group 15 is preferred. As the acid catalyst, dilute hydrochloric acid and acetic acid are preferable, and dilute hydrochloric acid is particularly preferable. As the basic catalyst, triethylamine and tetramethylammonium hydride are preferable, and triethylamine is particularly preferable.

  Metal element compound catalysts include radium hydroxide, barium hydroxide, strontium hydroxide, calcium hydroxide, magnesium hydroxide, beryllium hydroxide, barium hydroxide, barium hydroxide, strontium hydroxide, barium oxide, strontium oxide, oxidation Calcium, magnesium oxide, beryllium oxide, lanthanum hydroxide (III), cerium hydroxide (IV), zirconium hydroxide (IV), iron hydroxide (II), iron hydroxide (III), cobalt hydroxide (II), Nickel (II) hydroxide, copper (II) hydroxide, gold (III) hydroxide, zinc (II) hydroxide, cadmium hydroxide (II), aluminum (III) hydroxide, indium (III) hydroxide, water Thallium oxide (I), lead hydroxide (II), bismuth hydroxide (III), manganese oxide (IV , And iron oxide (II), include copper (II) oxide. Among these, from the viewpoint of availability and the like, hydroxides of Group 2 elements of the periodic table and hydroxides of metal elements belonging to Groups 3 to 15 of the periodic table are preferable. In particular, barium hydroxide, calcium hydroxide, magnesium hydroxide, strontium hydroxide, lanthanum hydroxide (III), aluminum hydroxide (III), iron hydroxide (II), iron hydroxide (III), and hydroxide Copper (II) is preferred. Further, it may be a hydroxide hydrate of the Group 2 element of the periodic table. In particular, barium hydroxide octahydrate, barium hydroxide monohydrate, and strontium hydroxide octahydrate are preferable.

  The metal element compound catalyst is preferably surface-treated with a silane coupling agent in advance. A conventionally well-known thing can be used for this silane coupling agent. In particular, from the viewpoint of the dispersibility of the catalyst, those having a structure similar to an organosilicon compound subjected to a condensation reaction, particularly an organosilicon compound containing an alkoxy group, are desirable. Examples of the silane coupling agent include trimethoxysilane, triethoxysilane, methyltrimethoxysilane, decyltrimethoxysilane, vinyltrimethoxysilane, phenyltrimethoxysilane, styryltrimethoxysilane, 3,3,3-tri Fluoro-propyltrimethoxysilane, 3-glycidyloxypropyldimethoxymethylsilane, 3-glycidyloxypropyltrimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-aminopropyltrimethoxysilane, 3-mercaptopropyltrimethoxysilane, 3-chloropropyltrimethoxysilane, 1,1,3,3,5,5-hexamethoxy-1,3,5-trimethyltrisiloxane, 1,1,5,5-tetramethoxy-1,3,5- Trimethyl Polysiloxane-3-ol, dimethyldimethoxysilane, dimethyldiethoxysilane, phenylmethyl dimethoxysilane, diphenyl dimethoxysilane, distyryl dimethoxysilane, di pentafluorophenyl dimethoxysilane, such as hexamethyldisilazane. Of these, trimethoxysilane, vinyltrimethoxysilane, methyltrimethoxysilane, and 3-glycidyloxypropyltrimethoxysilane are preferable.

  The surface treatment of the metal element compound catalyst with the silane coupling agent may be performed by a conventionally known method. For example, a wet method or a dry method can be used. The mixing ratio of the metal element compound catalyst and the silane coupling agent is not particularly limited, but in order not to impair the catalytic activity, the silane coupling agent 0.001 to 100 parts by mass of the metal element compound catalyst. It is preferable that it is 10 mass parts, Preferably it is 0.01-5 mass parts.

  The amount of the catalyst is not particularly limited as long as the condensation reaction proceeds sufficiently. For example, in the case of an acid-base catalyst, the amount is preferably 0.1 to 10% by weight, more preferably 0.5 to 5% by weight based on the total weight of the organosilicon compound and the catalyst. When an elemental compound is used as the catalyst, the amount is 0.01 to 20% by weight, preferably 0.1 to 10% by weight, more preferably 0.1 to 10% by weight based on the total weight of the organosilicon compound and the catalyst. The amount is 2 to 9% by weight, more preferably 0.5 to 5% by weight. If the amount of the catalyst is within the above range, it is preferable because a sufficient catalytic effect can be obtained in the condensation reaction.

  When a chlorosilane compound is used as the organosilane compound represented by the above formula (7) and the reaction is carried out in the presence of water, the generated hydrochloric acid serves as a catalyst, so that it is not necessary to add a catalyst.

  The condensation reaction and end-capping reaction may be performed in the presence of at least one solvent. The solvent is used to adjust the reaction rate and reaction rate, or as a product diluent. The solvent may be one or more selected from nonpolar solvents and polar solvents. Examples of the nonpolar solvent include hydrocarbons such as n-hexane, n-heptane, and isooctane, and aromatic hydrocarbons such as toluene and xylene. Examples of the polar solvent include water; alcohols such as methanol, ethanol and isopropanol; alcohol esters; ketones such as acetone, methyl ethyl ketone and cyclohexanone; ethers such as diethyl ether and dibutyl ether; ethyl acetate, isopropyl acetate and acetic acid. Esters such as butyl; Cyanide hydrocarbons such as acetonitrile; Amines; Amides such as acetamide; Halogenated hydrocarbons such as methylene chloride, chloroform and hexafluorometaxylene; Sulfur-containing compounds such as dimethyl sulfoxide Can be mentioned. The usage-amount of a solvent is not specifically limited, What is necessary is just to adjust suitably. Usually, the concentration of the organosilicon compound subjected to the reaction is 5 to 95% by mass, preferably 20 to 80% by mass. The above reaction can also be carried out in a solventless system.

  When a chlorosilane compound is used as the organosilane compound represented by the above formula (7), it is desirable to add an acid acceptor for neutralizing and removing hydrogen chloride generated by the reaction. Examples of the acid-accepting agent include alkylamines such as trimethylamine and triethylamine; nitrogen-containing heterocyclic compounds such as pyridine and piperazine, 1,4-diazabicyclo [2.2.2] octane (DABCO), 1,8-diazabiccyclo. Cyclic diamines such as [5.4.0] -7-undecene (DBU); 1,3-divinyl-1,1,3,3-tetramethyldisilazane, 1,1,3,3-tetravinyl- Silazanes such as 1,3-dimethyldisilazane, hexavinyldisilazane, 1,3-dimethyl-1,3-diphenyl-1,3-divinyldisilazane; inorganic substances such as magnesium hydroxide, magnesium oxide, sodium bicarbonate And a system acid acceptor. Of these, triethylamine, pyridine, and magnesium oxide are preferable.

  The condensation reaction and the end-capping reaction may be performed as separate steps, and the end-capping reaction may be performed after the condensation reaction step, or the condensation reaction and the end-capping reaction may be performed in one step. According to the above production method, the catalyst can be easily removed from the reaction product. The catalyst filtration is preferably performed after completion of the condensation reaction, but may be performed after completion of the end-capping reaction. In the filtration, the above-mentioned solvent may be used for the purpose of adjusting the viscosity of the obtained reaction product. The production method of the present invention may further include a step of performing purification by a known method such as washing with water, reduced pressure strip, activated carbon treatment for the purpose of removing unreacted monomers from the reaction product.

  The condensation reaction may be performed under heating conditions. A preferable range of the reaction temperature is 0 to 160 ° C, more preferably 60 to 100 ° C. The end-capping reaction may also be performed under heating conditions. The preferable range of reaction temperature is 0-100 degreeC, More preferably, it is 20-80 degreeC. When the condensation reaction and the end-capping reaction are performed in one step, the reaction temperature is 0 to 160 ° C, preferably 20 to 80 ° C. The reaction time may be appropriately selected.

  The above production method may further include a step of performing purification by a known method such as washing with water, reduced-pressure strip, activated carbon treatment for the purpose of removing unreacted monomers from the reaction product. In particular, when the above-described acid acceptor is used, a hydrochloride derived from the acid acceptor is generated, and it is desirable to remove this by a known method such as filtration, washing with water, or activated carbon treatment. In particular, amine hydrochloride promotes the cleavage of siloxane bonds and may act as a catalyst poison for the hydrosilylation reaction. Therefore, when used as a raw material for addition-curable organopolysiloxane compositions, it should be removed from the product as much as possible. It is particularly preferred.

(A) The alkenyl group-containing organopolysiloxane (A) component is an organopolysiloxane having a network structure represented by the following formula (1).
(R ¹ ₃ SiO _1/2 ) _r (R ¹ ₂ SiO _2/2 ) _s (R ¹ SiO _3/2 ) _t (SiO _4/2 ) _u (1)
(In the formula, R ¹ is independently of each other a substituted or unsubstituted saturated hydrocarbon group having 1 to 12 carbon atoms or an aromatic hydrocarbon group having 6 to 12 carbon atoms and an alkenyl group having 2 to 10 carbon atoms. Wherein at least two of R ¹ are alkenyl groups, r is an integer of 0 to 100, s is an integer of 0 to 300, t is an integer of 0 to 200, u Is an integer from 0 to 200, 1 ≦ t + u ≦ 400, 2 ≦ r + s + t + u ≦ 800, provided that r, s, t and u have at least two alkenyl groups in one molecule of the organopolysiloxane. Value)
The organopolysiloxane may be produced by a known method, or a commercially available product may be used.

In the above R ¹ , examples of the saturated hydrocarbon group and the aromatic hydrocarbon group include the same groups as those exemplified for the above R ³ . Examples of the alkenyl group include a vinyl group, an allyl group, a propenyl group, a hexenyl group, and a styryl group. Of these, a vinyl group and an allyl group are preferable, and a vinyl group is particularly preferable. At least two of the groups represented by R ¹ are alkenyl groups, and the other R ¹ is preferably a methyl group or a phenyl group.

  r is an integer of 0 to 100, preferably an integer of 1 to 75, and more preferably an integer of 2 to 50. s is an integer of 0 to 300, preferably an integer of 0 to 200, and more preferably an integer of 0 to 100. t is an integer of 0 to 200, preferably an integer of 1 to 100, and more preferably an integer of 1 to 50. u is an integer of 0-200, preferably an integer of 1-100, more preferably an integer of 1-50. 1 ≦ t + u ≦ 400, preferably 1 ≦ t + u ≦ 200, more preferably 1 ≦ t + u ≦ 100, preferably 2 ≦ r + s + t + u ≦ 800, preferably 2 ≦ r + s + t + u ≦ 400. More preferably, it is more preferably in the range of 2 ≦ r + s + t + u ≦ 200.

  Such an organopolysiloxane can be obtained by cocondensation of an organosilicon compound having an alkenyl group such as a vinyl group or an allyl group (for example, silane, siloxane, silazane) and another silane or siloxane. Preferred examples of the alkenyl group-containing silane include dimethylvinylchlorosilane, methylvinyldichlorosilane, vinyltrichlorosilane, trivinylchlorosilane, vinylmethylphenylchlorosilane, and alkoxy and silanol forms thereof. The siloxane is preferably a dimer, oligomer or polymer containing the alkenyl group-containing silane unit.

  Although the silane and siloxane to be co-condensed with the alkenyl group-containing organosilicon compound are not particularly limited, a silane having a hydrocarbon group containing a halogen, oxygen, nitrogen, or sulfur atom can be preferably used. For example, trimethylchlorosilane, dimethyldichlorosilane, methyltrichlorosilane, triphenylchlorosilane, diphenylmethylchlorosilane, phenyldimethylchlorosilane, phenylmethyldichlorosilane, diphenyldichlorosilane, phenyltrichlorosilane, tetrachlorosilane, triethylchlorosilane, diethyldichlorosilane, ethyltri Chlorosilane, cyclohexylmethyldichlorosilane, cyclohexyltrichlorosilane and their alkoxy and silanol bodies, trifluoropropyltrimethoxysilane, β-cyanoethyltrimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-glycidyloxypropyltrimethoxysilane , 3-mercaptopropyltrimethoxysilane, 3- Such as amino propyl trimethoxy silane can be used. Moreover, these oligomers and polymers can also be used suitably as siloxane. Cocondensation may be performed according to a conventionally known method.

The organohydrogenpolysiloxane and it is preferably at least one of the groups represented by R ¹ is an aromatic hydrocarbon group. In particular, the component (A) preferably has a monovalent aromatic hydrocarbon group bonded to a silicon atom in an amount of 3% to 90% of the total number of all substituents bonded to the silicon atom, more preferably. Is 5% or more. The upper limit of the number is more preferably 80% or less. By having the aromatic hydrocarbon group preferably in an amount within the above range, the component (A) has a high refractive index and low gas permeability, and is well compatible with the component (B). it can. Thereby, the composition can give the hardened | cured material excellent in transparency, and can use it suitably for sealing of a semiconductor element.

(C) Hydrosilylation catalyst (C) The component is a hydrosilylation catalyst. The catalyst may be any conventionally known catalyst and is not particularly limited. Among these, a catalyst selected from a platinum group metal simple substance and a platinum group metal compound is preferable. For example, platinum (including platinum black), platinum chloride, chloroplatinic acid, platinum-olefin complexes such as platinum-divinylsiloxane complex, platinum catalysts such as platinum-carbonyl complex, palladium catalysts, rhodium catalysts, and the like can be given. These catalysts may be used alone or in combination of two or more. Of these, platinum-olefin complexes such as chloroplatinic acid and platinum-divinylsiloxane complexes are particularly preferable.

The blending amount of component (C) is not particularly limited, and may be a catalytic amount. The catalyst amount is an amount that allows the addition reaction to proceed, and may be adjusted as appropriate according to the desired curing rate. For example, in the case of using a platinum group metal catalyst, from the viewpoint of reaction rate, 1.0 × 10 5 with respect to a total of 100 parts by mass of the components (A) and (B) on a mass basis converted to a platinum group metal atom. ^The amount of ^{−4 to} 1.0 part by mass is preferable, and the amount of 1.0 × 10 ^{−3 to} 1.0 × 10 ⁻¹ part by mass is more preferable. In addition, when (D) component and / or (E) component mentioned later are included, it is good that it is the quantity used as the said mass part with respect to a total of 100 mass parts of all the components.

(D) Linear Organo (poly) siloxane The silicone composition of the present invention may further contain (D) a linear organo (poly) siloxane having at least two alkenyl groups in one molecule.
The linear organopolysiloxane is represented by the following formula (3).
(R ⁶ ₃ SiO _1/2 ) ₂ (R ⁶ ₂ SiO _2/2 ) _d (3)
In the formula, R ⁶ is independently selected from a substituted or unsubstituted saturated hydrocarbon group having 1 to 12 carbon atoms or an aromatic hydrocarbon group having 6 to 12 carbon atoms and an alkenyl group having 2 to 10 carbon atoms. Provided that at least two of R ⁶ are alkenyl groups, d is an integer of 0 to 500, preferably an integer of 2 to 300, and more preferably an integer of 5 to 200.
The organopolysiloxane may be produced by a known method, or a commercially available product may be used.

  Such an organopolysiloxane can be obtained by cocondensation of a silane or siloxane or silazane having an alkenyl group such as a vinyl group or an allyl group with another silane or siloxane. Examples of suitable alkenyl group-containing silanes include dimethylvinylchlorosilane, methylvinyldichlorosilane, trivinylchlorosilane, vinylmethylphenylchlorosilane, and alkoxy and silanol forms thereof. Examples of suitable siloxanes include the above alkenyl groups. Dimers, oligomers and polymers containing silane units.

  Although the silane and siloxane to be co-condensed with the alkenyl group-containing organosilicon compound are not particularly limited, a silane having a hydrocarbon group containing a halogen, oxygen, nitrogen, or sulfur atom can be preferably used. For example, trimethylchlorosilane, dimethyldichlorosilane, triphenylchlorosilane, diphenylmethylchlorosilane, phenyldimethylchlorosilane, phenylmethyldichlorosilane, diphenyldichlorosilane, triethylchlorosilane, diethyldichlorosilane, cyclohexylmethyldichlorosilane, and their alkoxy and silanol bodies, Examples include trifluoropropylmethyldimethoxysilane, β-cyanoethylmethyldimethoxysilane, 3-methacryloxypropylmethyldimethoxysilane, 3-glycidyloxypropylmethyldimethoxysilane, 3-mercaptopropylmethyldimethoxysilane, and 3-aminopropylmethyldimethoxysilane. It is done. Moreover, as siloxanes, these oligomers and polymers can also be suitably used.

  The blending amount of the component (D) is 5 to 400 parts by weight with respect to 100 parts by weight of the component (A), preferably 10 to 350 parts by weight, more preferably 20 to 300 parts by weight, and 50 to 200 parts by weight. Part is preferred.

(E) Organohydrogen (poly) siloxane other than the component (B) The silicone composition of the present invention may contain an organohydrogen (poly) siloxane other than the component (B) as an optional component. Examples of the organohydrogen (poly) siloxane include at least one selected from the following (E-1) component, (E-2) component, and (E-3) component.

(E-1) Linear organohydrogen (poly) siloxane represented by the following formula (5):
(R ⁷ ₃ SiO _1/2 ) ₂ (R ⁷ ₂ SiO _2/2 ) _{d ′} (5)

In the formula, R ⁷ is independently a hydrogen atom and a group selected from a substituted or unsubstituted saturated hydrocarbon group having 1 to 12 carbon atoms or an aromatic hydrocarbon group having 6 to 12 carbon atoms, However, at least two are hydrogen atoms. Examples of the saturated hydrocarbon group and the aromatic hydrocarbon group include those described above. d 'is an integer of 0-100. d ′ is preferably an integer of 1 to 75, more preferably an integer of 1 to 50. The organohydrogenpolysiloxane may be produced by a conventionally known method or may be a commercially available product.

式中、Ｒ^８は、互いに独立に、置換または非置換の、炭素数１〜１２の飽和炭化水素基又は炭素数６〜１２の芳香族炭化水素基である。飽和炭化水素基及び芳香族炭化水素基としては上記したものが挙げられる。ｑは１〜３の整数であり、好ましくは１または２である。該オルガノハイドロジェンポリシロキサンは、従来公知の方法で製造されたものであってよく、市販品であってよい。 (E-2) Branched organohydrogen (poly) siloxane represented by the following formula (6):

In the formula, R ⁸ independently of each other is a substituted or unsubstituted saturated hydrocarbon group having 1 to 12 carbon atoms or an aromatic hydrocarbon group having 6 to 12 carbon atoms. Examples of the saturated hydrocarbon group and the aromatic hydrocarbon group include those described above. q is an integer of 1 to 3, preferably 1 or 2. The organohydrogenpolysiloxane may be produced by a conventionally known method or may be a commercially available product.

(E-3) Organohydrogen (poly) siloxane represented by the following formula (7):
(R ⁷ ₃ SiO _1/2 ) _{r ′} (R ⁷ ₂ SiO _2/2 ) _{s ′} (R ⁷ SiO _3/2 ) _{t ′} (SiO _4/2 ) _{u ′}
(7)
In the formula, R ⁷ is independently a hydrogen atom and a group selected from a substituted or unsubstituted saturated hydrocarbon group having 1 to 12 carbon atoms or an aromatic hydrocarbon group having 6 to 12 carbon atoms, However, at least two are hydrogen atoms. Examples of the saturated hydrocarbon group and the aromatic hydrocarbon group include those described above. r ′ is an integer from 0 to 50, s ′ is an integer from 0 to 100, t ′ is an integer from 0 to 100, u ′ is an integer from 1 to 100, 2 ≦ r ′ + s ′ ≦ 150, 2 ≦ r '+ S' + u '≦ 250. r ′ is preferably an integer from 0 to 40, more preferably an integer from 0 to 30, s ′ is preferably an integer from 0 to 75, more preferably an integer from 0 to 50, and t ′. Is preferably an integer from 0 to 50. u ′ is an integer of 1 to 100, preferably an integer of 1 to 75, more preferably an integer of 2 to 50, 2 ≦ r ′ + s ′ ≦ 150, preferably 3 ≦ r ′ + s. '≦ 100, more preferably 4 ≦ r ′ + s ′ ≦ 50. 2 ≦ r ′ + s ′ + t ′ + u ′ ≦ 250, preferably 4 ≦ r ′ + s ′ + t ′ + u ′ ≦ 150, and more preferably 6 ≦ r ′ + s ′ + t ′ + u ′ ≦ 75. The organopolysiloxane has at least one Q unit (SiO _4/2 ). Therefore, the organopolysiloxane does not need to have T units (R ⁷ SiO _3/2 ), and particularly preferably t ′ = 0.
The organohydrogenpolysiloxane may be produced by a conventionally known method or may be a commercially available product.

  The blending amount of the component (E) is the hydrosilyl group in the component (B) and the component (E) with respect to the total number of alkenyl groups in the component (A) or in the component (A) and the component (D). The total number ratio is 0.4 to 4, preferably 0.6 to 3, and more preferably 0.8 to 2. Furthermore, the quantity which the mass of (E) component with respect to the total mass of (B) component and (E) component becomes 5 to 95% is good, Preferably it is 10 to 90%, More preferably, 20 to 80% is good. If it is in this range, the effect of improving the low temperature characteristics by the component (B) can be sufficiently obtained.

  In addition to the components (A) to (E) described above, the silicone composition of the present invention may contain a phosphor, an inorganic filler, an adhesion aid, a curing inhibitor, and the like as necessary. Hereinafter, each component will be described.

[Phosphor]
The phosphor is not particularly limited, and a conventionally known phosphor may be used. For example, it is preferable to absorb light from a semiconductor element, particularly a semiconductor light emitting diode having a nitride-based semiconductor as a light emitting layer, and convert the light to light having a different wavelength. Examples of such phosphors include nitride-based phosphors / oxynitride-based phosphors mainly activated by lanthanoid elements such as Eu and Ce, lanthanoid-based substances such as Eu, and transition metal-based substances such as Mn. Alkaline earth metal halogen apatite phosphor, alkaline earth metal borate phosphor, alkaline earth metal aluminate phosphor, alkaline earth metal silicate phosphor, alkaline earth metal activated mainly by elements Sulfide phosphor, alkaline earth metal thiogallate phosphor, alkaline earth metal silicon nitride phosphor, germanate phosphor, rare earth aluminate phosphor mainly activated by lanthanoid elements such as Ce, rare earth Organic and organic complex phosphors mainly activated by lanthanoid elements such as silicate phosphors or Eu, Ca—Al—Si—O—N oxynitride glass phosphors It is preferably at least one member selected from.

As a nitride phosphor mainly activated by a lanthanoid element such as Eu or Ce, M ₂ Si ₅ N ₈ : Eu (M is at least one selected from Sr, Ca, Ba, Mg, Zn) There is). _{Further, MSi 7 N 10: Eu,} M 1.8 Si 5 O 0.2 N 8: Eu, and _{M 0.9 Si 7 O 0.1 N 10} : Eu (M is, Sr, Ca, Ba, Mg And at least one selected from Zn).

As an oxynitride phosphor mainly activated by a lanthanoid element such as Eu or Ce, MSi ₂ O ₂ N ₂ : Eu (M is at least one selected from Sr, Ca, Ba, Mg, Zn) Is).

Examples of alkaline earth metal halogen apatite phosphors mainly activated by lanthanoid-based elements such as Eu and transition metal-based elements such as Mn include M ₅ (PO ₄ ) ₃ X: R (M is Sr, Ca, Ba). X is at least one selected from F, Cl, Br and I. R is any one or more of Eu, Mn, Eu and Mn) Is mentioned.

As the alkaline earth metal borate phosphor, M ₂ B ₅ O ₉ X: R (M is at least one selected from Sr, Ca, Ba, Mg, Zn. X is F, Cl, And at least one selected from Br and I. R is any one or more of Eu, Mn, Eu and Mn).

The alkaline earth metal aluminate _{phosphor, SrAl 2 O 4: R,} Sr 4 Al 14 O 25: R, CaAl 2 O 4: R, BaMg 2 Al 16 O 27: R, BaMg 2 Al 16 O 12 : R and BaMgAl ₁₀ O ₁₇ : R (R is any one or more of Eu, Mn, Eu and Mn).

Examples of the alkaline earth metal sulfide phosphor include La ₂ O ₂ S: Eu, Y ₂ O ₂ S: Eu, and Gd ₂ O ₂ S: Eu.

As rare earth aluminate phosphors mainly activated by a lanthanoid element such as Ce, Y ₃ Al ₅ O ₁₂ : Ce, (Y _0.8 Gd _0.2 ) ₃ Al ₅ O ₁₂ : Ce, Y ₃ Examples thereof include YAG-based phosphors represented by the composition formula of (Al _0.8 Ga _0.2 ) ₅ O ₁₂ : Ce and (Y, Gd) ₃ (Al, Ga) ₅ O ₁₂ . Further, there are Tb ₃ Al ₅ O ₁₂ : Ce, Lu ₃ Al ₅ O ₁₂ : Ce, etc. in which a part or all of Y is substituted with Tb, Lu or the like.

Other phosphors include ZnS: Eu, Zn ₂ GeO ₄ : Mn, MGa ₂ S ₄ : Eu (M is at least one selected from Sr, Ca, Ba, Mg, Zn. X is F) , Cl, Br, or I).

  The phosphor contains at least one selected from Tb, Cu, Ag, Au, Cr, Nd, Dy, Co, Ni, Ti instead of Eu or in addition to Eu as desired. Can do.

The Ca—Al—Si—O—N-based oxynitride glass phosphor is in mol%, CaCO ₃ is converted to CaO, 20 to 50 mol%, Al ₂ O ₃ is 0 to 30 mol%, and SiO is doped. An oxynitride glass having 25 to 60 mol%, 5 to 50 mol% AlN, 0.1 to 20 mol% rare earth oxide or transition metal oxide, and a total of five components of 100 mol% is used as a base material. Phosphor. In addition, in the phosphor using oxynitride glass as a base material, the nitrogen content is preferably 15 wt% or less, and other rare earth element ions serving as a sensitizer in addition to rare earth oxide ions are used as rare earth oxides. It is preferable to contain as a co-activator in content in the range of 0.1-10 mol% in fluorescent glass.

  Moreover, it is also possible to use a phosphor other than the above phosphors and having the same performance and effect.

  As for the compounding quantity of fluorescent substance, 0.1-2,000 mass parts is preferable with respect to 100 mass parts of components other than fluorescent substance, for example (A)-(C) component, More preferably, it is 0.1-100 mass. Part. When making the hardened | cured material of this invention into a fluorescent substance containing wavelength conversion film, it is preferable that content of fluorescent substance shall be 10-2,000 mass parts. The phosphor preferably has an average particle diameter of 10 nm or more, more preferably 10 nm to 10 μm, and still more preferably 10 nm to 1 μm. The average particle diameter is measured by particle size distribution measurement by a laser light diffraction method such as a cirrus laser measuring apparatus.

[Inorganic filler]
Examples of the inorganic filler include silica, fumed silica, fumed titanium dioxide, alumina, calcium carbonate, calcium silicate, titanium dioxide, ferric oxide, and zinc oxide. These can be used individually by 1 type or in combination of 2 or more types. Although the compounding quantity of an inorganic filler is not restrict | limited in particular, What is necessary is just to mix | blend suitably in the range of 20 mass parts or less, preferably 0.1-10 mass parts per total 100 mass parts of (A)-(C) component.

[Adhesion aid]
The silicone composition of the present invention may contain an adhesion aid as necessary in order to impart adhesiveness. Examples of the adhesion assistant include organosiloxane oligomers having at least two, preferably three, functional groups selected from a hydrogen atom bonded to a silicon atom, an alkenyl group, an alkoxy group, and an epoxy group in one molecule. . The organosiloxane oligomer preferably has 4 to 50 silicon atoms, more preferably 4 to 20 silicon atoms. Further, as an adhesion assistant, an organooxysilyl-modified isocyanurate compound represented by the following general formula (10) and a hydrolysis condensate thereof (organosiloxane-modified isocyanurate compound) can be used.

上記式（１０）中、Ｒは互いに独立に、下記（１１）で示される有機基、又は酸素原子を有してよい脂肪族不飽和炭化水素基である。但し、Ｒの少なくとも１個は下記（１１）で示される基である。

In the above formula (10), R is independently an organic group represented by the following (11) or an aliphatic unsaturated hydrocarbon group which may have an oxygen atom. However, at least one R is a group represented by the following (11).

Ｒ^’は水素原子又は炭素数１〜６の一価炭化水素基であり、ｎは１〜６の整数、好ましくは１〜４の整数である。脂肪族不飽和炭化水素基としては、好ましくは炭素数２〜８、更に好ましくは炭素数２〜６の、直鎖状又は分岐を有するアルケニル基、例えば、ビニル基、アリル基、１−ブテニル基、１−ヘキセニル基、及び２−メチルプロペニル基、又は（メタ）アクリル基等が挙げられる。

R ^′ is a hydrogen atom or a monovalent hydrocarbon group having 1 to 6 carbon atoms, and n is an integer of 1 to 6, preferably an integer of 1 to 4. The aliphatic unsaturated hydrocarbon group is preferably a linear or branched alkenyl group having 2 to 8 carbon atoms, more preferably 2 to 6 carbon atoms, such as a vinyl group, an allyl group, or a 1-butenyl group. , 1-hexenyl group, 2-methylpropenyl group, or (meth) acryl group.

  As for the compounding quantity of an adhesion assistant, 10 mass parts or less are preferable with respect to a total of 100 mass parts of (A)-(C) component, More preferably, it is 0.1-8 mass parts, Most preferably, it is 0.2-. 5 parts by mass. If the blending amount is less than or equal to the above upper limit value, the cured product hardness is high, and surface tackiness is also suppressed.

[Curing inhibitor]
The silicone composition of the present invention may contain a curing inhibitor in order to control the reactivity and increase the storage stability. The curing inhibitor is selected from the group consisting of triallyl isocyanurate, alkyl maleate, acetylene alcohols, silane-modified products and siloxane-modified products thereof, hydroperoxide, tetramethylethylenediamine, benzotriazole, and mixtures thereof. Compounds. As for the compounding quantity of a hardening inhibitor, 0.001-1 mass part is preferable per 100 mass parts of total of (A)-(C) component, More preferably, it is 0.005-0.5 mass part.

[Other additives]
In addition to the above components, other additives can be added to the silicone composition of the present invention. Examples of other additives include anti-aging agents, radical inhibitors, flame retardants, surfactants, ozone degradation inhibitors, light stabilizers, thickeners, plasticizers, antioxidants, thermal stabilizers, and conductivity. Examples include an imparting agent, an antistatic agent, a radiation blocking agent, a nucleating agent, a phosphorus peroxide decomposing agent, a lubricant, a pigment, a metal deactivator, a physical property modifier, and an organic solvent. These optional components may be used alone or in combination of two or more.

  The simplest embodiment of the silicone composition of the present invention is a composition comprising (A) component, (B) component, and (C) component. Furthermore, the composition which consists of (A) component, (B) component, (C) component, and (D) component, (A) component, (B) component, (C) component, and (E) component And a composition comprising the component (A), the component (B), the component (C), the component (D), and the component (E). Moreover, the composition containing (A) component, (B) component, (C) component, and fluorescent substance is also preferable. In particular, in order to obtain a cured product having high transparency, it is preferable not to contain an inorganic filler such as a silica filler. Examples of the inorganic filler are as described above.

  The method for preparing the silicone composition of the present invention is not particularly limited, and may be a conventionally known method. The component (A), the component (B), the component (C), and optionally the component (D) , (E) component and other optional components may be prepared by mixing by any method. For example, it can be prepared by putting in a commercially available stirrer (THINKY CONDITIONING MIXER (manufactured by Shinky Co., Ltd.)) and mixing uniformly for about 1 to 5 minutes.

  The method for curing the silicone composition of the present invention is not particularly limited, and may be a conventionally known method. For example, it can be cured at 60 to 180 ° C. for about 1 to 12 hours. In particular, it is preferable to cure by step cure at 60 to 150 ° C. In step cure, it is more preferable to go through the following two stages. First, the silicone composition is heated at a temperature of 60 to 100 ° C. for 0.5 to 2 hours to sufficiently degas. Next, the silicone composition is heat-cured at a temperature of 120 to 180 ° C. for 1 to 10 hours. By passing through these steps, even if the cured product is thick, it can be sufficiently cured, no bubbles are generated, and it can be colorless and transparent. In the present invention, the colorless and transparent cured product means that the light transmittance at 450 nm with respect to 1 mm thickness is 80% or more, preferably 85% or more, particularly preferably 90% or more.

  The silicone composition of the present invention provides a cured product having high light transmittance. Therefore, the silicone composition of the present invention is useful for LED element sealing, particularly for blue LED or ultraviolet LED element sealing. The method of sealing LED elements etc. with the silicone composition of this invention should just follow a conventionally well-known method. For example, a dispensing method and a compression molding method can be used.

  Furthermore, since the silicone composition of the present invention gives a cured product having excellent crack resistance, heat resistance, light resistance, transparency, etc., display materials, optical recording medium materials, optical equipment materials, optical component materials, optical fibers It is also useful for applications such as materials, optical / electronic functional organic materials, and semiconductor integrated circuit peripheral materials.

  EXAMPLES Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated in detail, this invention is not restrict | limited to the following Example.

The weight average molecular weight (Mw) shown in the following examples is a value measured by gel permeation chromatography (GPC) using polystyrene as a standard substance. The measurement conditions are shown below.
[GPC measurement conditions]
Developing solvent: Tetrahydrofuran Flow rate: 0.6 mL / min
Column: TSK Guardcolumn SuperH-L
TSKgel SuperH4000 (6.0 mm ID × 15 cm × 1)
TSKgel Super H3000 (6.0 mm ID × 15 cm × 1)
TSKgel SuperH2000 (6.0 mm ID × 15 cm × 2)
(Both manufactured by Tosoh Corporation)
Column temperature: 40 ° C
Sample injection amount: 20 μL (sample concentration: 0.5 wt% -tetrahydrofuran solution)
Detector: Differential refractometer (RI)

The Vi value (mol / 100 g) and SiH value (mol / 100 g) shown in the following Examples are obtained by measuring a 400 MHz ¹ H-NMR spectrum of a compound, and an integrated value of hydrogen atoms obtained using dimethyl sulfoxide as an internal standard. It is calculated from
Further, ¹ H-NMR measurement was performed using ULTRASHIELD ^™ 400PLUS (manufactured by BRUKER), and ²⁹ Si-NMR measurement was performed using RESONANCE 500 (manufactured by JEOL).

[Synthesis Example 1] Synthesis of branched organohydrogenpolysiloxane (B-1) 318.5 g (1.0 mol) of 1,1-diphenyl-1,3-dimethyl-3,3-dimethoxydisiloxane and 283 of dimethylchlorosilane 0.8 g (3.0 mol) was mixed and adjusted to 10 ° C. Thereafter, 108 g of water was added dropwise with stirring, and the reaction was performed for 8 hours. 500 g of toluene was added to the obtained product, washed with water, and distilled under reduced pressure at 140 ° C. to obtain a branched organopolysiloxane represented by the following formula. Mw = 531, SiH value = 0.50 mol / 100 g. ^{From 29} Si-NMR spectrum, it was found that m = average 1 in the following formula.

[Synthesis Example 2] Synthesis of Branched Organohydrogen Polysiloxane (B-2) 524.1 g (1 mol) of 1,1,3,3-tetraphenyl-1,5-dimethyl-5,5-dimethoxytrisiloxane Dimethylchlorosilane (283.8 g, 3.0 mol) was mixed and adjusted to 10 ° C. Thereafter, 108 g of water was added dropwise with stirring, and the reaction was performed for 8 hours. 800 g of toluene was added to the obtained product, washed with water, and distilled under reduced pressure at 140 ° C. to obtain a branched organopolysiloxane represented by the following formula. Mw = 732, SiH value = 0.33 mol / 100 g. ^{From 29} Si-NMR spectrum, it was found that m = average 1 in the following formula.

[Synthesis Example 3] Synthesis of branched organohydrogenpolysiloxane (B-3) 318.5 g (1.0 mol) of 1,1-diphenyl-1,3-dimethyl-3,3-dimethoxydisiloxane, polymethylphenyl 1074.8 g (2.0 mol) of siloxane-α, ω-diol (Mw = 537.43) was stirred and adjusted to 60 ° C. Thereafter, 2.4 g of Sr (OH) ₂ .8H ₂ O was added and reacted for 1 hour. The mixture was neutralized by adding 1.5 g of acetic acid and adjusted to 10 ° C., and then 283.8 g (3.0 mol) of dimethylchlorosilane was added, followed by dropwise addition of 120 g of water, and a reaction was performed for 8 hours. To the obtained product, 2500 g of toluene was added, washed with water, and distilled under reduced pressure at 140 ° C. to obtain a branched organopolysiloxane represented by the following formula. Mw = 1574 and SiH value = 0.14 mol / 100 g. ^{From 29} Si-NMR spectrum, it was found that n = average 7 and m = average 1.2 in the following formula.

[Synthesis Example 4] Synthesis of branched organohydrogenpolysiloxane (B-4) 121.8 g (0.4 mol) of 1,1-diphenyl-1-dimethyl-3,3-dimethoxydisiloxane and polydimethylsiloxane-α , Ω-diol (Mw = 1498), 749.0 g (0.5 mol) were mixed and adjusted to 80 ° C. with stirring. Thereafter, 30 g of Mg (OH) ₂ .8H ₂ O was added, and the reaction was performed at 80 ° C. for 8 hours while distilling off the generated methanol. The mixture was neutralized by adding 34 g of acetic acid, adjusted to 10 ° C., 23.7 g (0.25 mol) of dimethylchlorosilane was added, 22 g of water was subsequently added dropwise, and the reaction was performed for 8 hours. 1000 g of toluene was added to the obtained product, washed with water, and distilled under reduced pressure at 140 ° C. to obtain a branched organopolysiloxane represented by the following formula. Mw = 9159, SiH value = 0.069 mol / 100 g. ^{From the 29} Si-NMR spectrum, it was found that n = average 104 and m = average 4.3 in the following formula.

[Synthesis Example 5] Synthesis of branched organohydrogenpolysiloxane (B-5) 194.4 g (1 mol) of 1,1,1,3-tetramethyl-3,3-dimethoxydisiloxane and polydimethylsiloxane-α, 749.0 g (0.5 mol) of ω-diol (Mw = 1498) was mixed and adjusted to 80 ° C. with stirring. Thereafter, 12 g of Sr (OH) ₂ .8H ₂ O was added, and the reaction was performed at 80 ° C. for 8 hours while distilling off the generated methanol. 7.0 g of acetic acid was added for neutralization and the temperature was adjusted to 10 ° C., and then 11.4 g (0.12 mol) of dimethylchlorosilane was added, followed by dropwise addition of 5.2 g of water and a reaction was performed for 24 hours. 1000 g of toluene was added to the obtained product, washed with water, and distilled under reduced pressure at 140 ° C. to obtain a branched organopolysiloxane represented by the following formula. Mw = 19,568 and SiH value = 0.010 mol / 100 g. ^{From 29} Si-NMR spectrum, it was found that n = average 220 and m = average 21.

上記式において、ＲはＣＨ_３またはＨであり、平均して少なくとも２つのＲは水素原子である。 [Comparative Synthesis Example] Synthesis of comparative branched organohydrogenpolysiloxane (B'-1) Polydimethylsiloxane-α, ω-diol (Mw = 1498) 749.0 g (0.5 mol) and dimethylchlorosilane 11.4 (0.12 mol), 108.6 g (1 mol) of trimethylchlorosilane, and 149.5 g (1 mol) of methyltrichlorosilane were mixed and adjusted to 10 ° C. while stirring, and an aqueous solution of 88 g of water and 5.1 g of 98% concentrated sulfuric acid was mixed. It was dripped. Thereafter, the reaction was performed for 12 hours, 1000 g of toluene was added and washed with water, and distilled under reduced pressure at 140 ° C. to obtain a branched organopolysiloxane represented by the following formula. Mw = 18,591, SiH value = 0.010 mol / 100 g. ^{From the 29} Si-NMR spectrum, it was found that n and n ′ were 104 on average in the following formula, and m = 19 on average.

In the above formula, R is CH ₃ or H, and on average at least two R are hydrogen atoms.

  The components (A), (C), (D), and (E) used in Examples and Comparative Examples are as follows.

ｎ単位数とｍ単位数の比率：ｎ＝０．２２、ｍ＝０．７８
（Ａ−２）下記式で表されるメチル系シリコーンレジン（信越化学工業株式会社製、Ｖｉ価＝０．０９１ｍｏｌ／１００ｇ、重量平均分子量はＭｗ＝５２１１）

ｎ単位数、ｍ単位数、及びｊ単位数の比率：ｎ＝０．０６、ｍ＝０．３６、ｊ＝０．５８
（Ｃ）塩化白金酸のジビニルシロキサン錯体
（Ｄ−１）下記式で表されるシリコーンオイル（信越化学工業株式会社製、Ｖｉ価＝０．０３８ｍｏｌ／１００ｇ）

（Ｄ−２）下記式で表されるシリコーンオイル（信越化学工業株式会社製、Ｖｉ価＝０．０２２ｍｏｌ／１００ｇ）

（Ｄ−３）下記式で表されるシリコーンオイル（信越化学工業株式会社製、Ｖｉ価＝０．０１３ｍｏｌ／１００ｇ）

（Ｅ−１）下記式で表される直鎖状オルガノハイドロジェンシロキサン（信越化学工業株式会社製、ＳｉＨ価＝０．６０ｍｏｌ／１００ｇ）

（Ｅ−２）下記式で表される分岐状オルガノハイドロジェンシロキサン（信越化学工業株式会社製、ＳｉＨ価＝０．９０ｍｏｌ／１００ｇ）

（Ｅ−３）下記式で表される直鎖状オルガノハイドロジェンポリシロキサン（信越化学工業株式会社製、ＳｉＨ価＝１．６３ｍｏｌ／１００ｇ）

(A-1) Phenyl silicone resin represented by the following formula (manufactured by Shin-Etsu Chemical Co., Ltd., Vi value = 0.147 mol / 100 g, weight average molecular weight Mw = 1563)

Ratio of n unit number to m unit number: n = 0.22, m = 0.78
(A-2) Methyl silicone resin represented by the following formula (manufactured by Shin-Etsu Chemical Co., Ltd., Vi value = 0.091 mol / 100 g, weight average molecular weight is Mw = 5211)

Ratio of n unit number, m unit number, and j unit number: n = 0.06, m = 0.36, j = 0.58
(C) Divinylsiloxane complex of chloroplatinic acid (D-1) Silicone oil represented by the following formula (manufactured by Shin-Etsu Chemical Co., Ltd., Vi value = 0.038 mol / 100 g)

(D-2) Silicone oil represented by the following formula (Shin-Etsu Chemical Co., Ltd., Vi value = 0.022 mol / 100 g)

(D-3) Silicone oil represented by the following formula (Shin-Etsu Chemical Co., Ltd., Vi value = 0.013 mol / 100 g)

(E-1) Linear organohydrogensiloxane represented by the following formula (Shin-Etsu Chemical Co., Ltd., SiH value = 0.60 mol / 100 g)

(E-2) Branched organohydrogensiloxane represented by the following formula (Shin-Etsu Chemical Co., Ltd., SiH value = 0.90 mol / 100 g)

(E-3) Linear organohydrogenpolysiloxane represented by the following formula (manufactured by Shin-Etsu Chemical Co., Ltd., SiH value = 1.63 mol / 100 g)

[Examples 1-7 and Comparative Examples 1-3]
The above components other than the catalyst are mixed in the blending amounts shown in Table 1, and (C) the catalyst is added in an amount of 5 ppm as a platinum amount with respect to the total mass of the composition and further mixed to prepare a silicone composition. did. The following tests were conducted on the silicone compositions prepared in Examples 1 to 7 and Comparative Examples 1 to 3. In addition, the value of H / Vi described in Table 1 is the ratio of the total number of hydrosilyl groups to the total number of vinyl groups in the entire composition.

[(1) Viscosity of silicone composition]
According to JIS Z 8803: 2011, the viscosity of the silicone composition at 23 ° C. was measured using a B-type viscometer. The results are listed in Tables 2 and 3.

[(2) Hardness of cured product]
The prepared silicone composition was poured into an aluminum petri dish with a diameter of 50 mm and a thickness of 10 mm, and cured in the order of 60 ° C. × 1 hour, 100 ° C. × 1 hour, 150 ° C. × 4 hours to obtain a cured product. The hardness (durometer Type A or Type D) of the obtained cured product was measured according to JIS K 6253-3: 2012. The results are listed in Tables 2 and 3.

[(3) Light transmittance of cured product]
A concave 1 mm thick Teflon (registered trademark) spacer is sandwiched between two 50 mm × 20 mm × 1 mm thick glass slides, and after fixing them, the silicone composition is poured, 60 ° C. × 1 hour, 100 ° C. × 1 hour Then, a sample was prepared by step curing in the order of 150 ° C. × 4 hours. The light transmittance at 450 nm of the obtained sample was measured with a spectrophotometer U-4100 (manufactured by Hitachi High-Technologies Corporation). The results are listed in Tables 2 and 3.

[(4) Tensile strength of cured product and elongation at break]
The prepared silicone composition was poured into a 150 mm × 200 mm × 2 mm thick concave Teflon (registered trademark) mold, and the sample was subjected to step cure in the order of 60 ° C. × 1 hour, 100 ° C. × 1 hour, then 150 ° C. × 4 hours. Was made. In accordance with JIS K 6251: 2010, using EZ TEST (EZ-L, manufactured by Shimadzu Corporation), the sample was pulled under the conditions of a test speed of 500 mm / min, a distance between grippers of 80 mm, and a distance between gauge points of 40 mm. Strength and elongation at break were measured. The results are listed in Tables 2 and 3.

[(5) Glass transition temperature of cured product]
The storage elastic modulus (MPa) of the cured product sample prepared in (4) above was measured in the range of −140 ° C. to 150 ° C. using DMA Q800 (manufactured by TA Instruments Co., Ltd.), and the storage elastic modulus obtained. The temperature at the peak top obtained from the graph plotting the value of Tan δ derived from the value of γ was the glass transition temperature: Tg. Measurement conditions were 20 mm long × 5 mm width × 1 mm thick sample, temperature rising rate 5 ° C./min, multi-frequency mode, tensile mode, and amplitude 15 μm. The results are listed in Tables 2 and 3.

[(6) Temperature cycle test]
The silicone composition was dispensed into a Tigger 3528 package (manufactured by Shin-Etsu Chemical Co., Ltd.), step cured in the order of 60 ° C. × 1 hour, 100 ° C. × 1 hour, then 150 ° C. × 4 hours, and the package was sealed with a cured product. Test specimens were manufactured. About 20 of the test specimens, a thermal cycle test (TCT) of -50 ° C. to 140 ° C. and 1,000 times was performed, and the number of the test specimens in which cracks occurred in the encapsulated material was measured. The results are listed in Tables 2 and 3.

  As shown in Table 3, obtained from a silicone composition containing a branched organohydrogenpolysiloxane having a long siloxane chain in the branched chain, and a silicone composition containing an organohydrogen (poly) siloxane having no branched chain. The cured product is cracked in the TCT test and is inferior in low temperature and high temperature resistance. On the other hand, as shown in Table 2, the silicone composition containing the branched organohydrogenpolysiloxane of the present invention gives a cured product excellent in low temperature and high temperature resistance without causing cracks in the TCT test. Further, as can be seen from the comparison between Example 1 and Comparative Example 1 and the comparison between Example 7 and Comparative Examples 2 and 3, the organohydrosiloxane of the present invention having a short branched chain is used for the organopolysiloxane having the same chain length. A composition containing genpolysiloxane has a lower glass transition temperature than a composition containing an organohydrogenpolysiloxane having a straight chain or a long branched chain. In addition, Examples 6 and 7 and Comparative Examples 2 and 3 have remarkably low glass transition temperatures as compared with Examples 1 to 5 and Comparative Example 1. This is because one or more or all of the components (A), (B), (D) and (E) do not have an aromatic group.

[Water vapor transmission rate]
The silicone compositions of Example 1, Example 7, and Comparative Example 1 were each poured into a concave Teflon (registered trademark) mold having a thickness of 150 mm × 200 mm × 2 mm, 60 ° C. × 1 hour, 100 ° C. × 1 hour, 150 ° C. × Each test sample was prepared by step curing in the order of 4 hours. The water vapor transmission rate of the obtained sample was measured by the Lyssy method (device name L80-5000, manufactured by Lyssy) based on JIS K7129. The water vapor permeability of each cured product was as follows.
Example 1: 19 g · m ² / day
Example 7: 65 g · m ² / day
Comparative Example 1: 18 g · m ² / day
Both the component (A) and the component (B) contained in the compositions of Example 1 and Comparative Example 1 have an aromatic group. On the other hand, neither the component (A) nor the component (B) contained in the composition of Example 7 has an aromatic group. As shown in the above result, in order to obtain a cured product having lower gas permeability, it is preferable that the component (A) and the component (B) have an aromatic group.

  The cured product obtained from the addition-curable silicone composition of the present invention has good low temperature characteristics, excellent temperature change resistance, and good crack resistance. Therefore, by sealing the semiconductor element with the cured product of the addition-curable silicone composition of the present invention, a semiconductor device having excellent reliability can be provided. Moreover, in order to give the hardened | cured material which has high light transmittance, it is useful for LED element sealing, especially for blue LED and ultraviolet LED element sealing.

Claims (9)

Addition-curable silicone composition containing the following components (A) to (C) (A) Organopolysiloxane having a network structure having at least two alkenyl groups in one molecule, represented by the following formula (1)
(R ¹ ₃ SiO _1/2 ) _r (R ¹ ₂ SiO _2/2 ) _s (R ¹ SiO _3/2 ) _t (SiO _4/2 ) _u (1)
(In the formula, R ¹ is independently of each other a substituted or unsubstituted saturated hydrocarbon group having 1 to 8 carbon atoms or an aromatic hydrocarbon group having 6 to 10 carbon atoms and an alkenyl group having 2 to 3 carbon atoms. A group selected, wherein at least two of R ¹ are alkenyl groups, r is an integer of 1 to 75 , s is an integer of 0 to 200 , t is an integer of 0 to 200 , u Is an integer of 0 to 200, 1 ≦ t + u ≦ 200 , 2 ≦ r + s + t + u ≦ 400 , provided that r, s, t and u have at least two alkenyl groups in one molecule of the organopolysiloxane. Value)
(B) A branched organohydrogenpolysiloxane represented by the following formula (2) having at least two hydrosilyl groups in one molecule

(Wherein R ³ are each independently a substituted or unsubstituted saturated hydrocarbon group having 1 to 8 carbon atoms or an aromatic hydrocarbon group having 6 to 10 carbon atoms, and R ⁴ are independently , A hydrogen atom, and a substituted or unsubstituted group selected from a substituted or unsubstituted saturated hydrocarbon group having 1 to 8 carbon atoms or an aromatic hydrocarbon group having 6 to 10 carbon atoms, and R ⁵ is independently a methyl group Or a phenyl group, at least two of the groups represented by R ⁴ are hydrogen atoms, x is an integer of 0 to 3, a is an integer of 1 to 50 , and b is an integer of 0 to 300. Yes, provided that 1 ≦ a + b ≦ 350 , and the siloxane unit in parentheses may form a random structure or a block unit)
(A) An amount in which the ratio of the number of hydrosilyl groups in the component (B) to the number of alkenyl groups in the component is 0.4 to 4, and (C) a hydrosilylation catalyst catalyst amount. (D) A linear organo (poly) siloxane having at least two alkenyl groups in one molecule represented by the following formula (3) is (R ⁶ ₃ SiO _1/2 ) ₂ (R ⁶ ₂ SiO _{2/2 D} (3)
(In the formula, R ⁶ is, independently of each other, substituted or unsubstituted C 1-12 saturated hydrocarbon group or C 6-12 aromatic hydrocarbon group, and C 2-10 alkenyl group. A selected group, provided that at least two of R ⁶ are alkenyl groups, and d is an integer of 0 to 500).
The amount of the component (A) is 5 to 400 parts by mass with respect to 100 parts by mass of the component (A) and the component (B) in the component (B) relative to the total number of alkenyl groups in the component (A) and the component (D). Further included in an amount such that the ratio of the total number of hydrosilyl groups is 0.4 to 4.
The addition-curable silicone composition according to claim 1.   The addition-curable silicone composition according to claim 1 or 2, wherein x = 0 in formula (2). The addition-curable silicone composition according to any one of claims 1 to 3, wherein in formula (2), at least one of R ³ is an aromatic hydrocarbon group having 6 to 10 carbon atoms.   The branched organopolysiloxane (B) has a monovalent aromatic hydrocarbon group bonded to a silicon atom in an amount of 3% to 90% of the total number of all substituents bonded to the silicon atom. The addition-curable silicone composition according to any one of -4. (E) At least 1 sort (s) of organohydrogen polysiloxane chosen from the following (E-1) component, (E-2) component, and (E-3) component is further included in any one of Claims 1-5. Addition-curable silicone composition (E-1) described in the item, linear organohydrogen (poly) siloxane represented by the following formula (5):
(R ⁷ ₃ SiO _1/2 ) ₂ (R ⁷ ₂ SiO _2/2 ) _{d ′} (5)
(In the formula, R ⁷ is a group independently selected from a hydrogen atom and a substituted or unsubstituted saturated hydrocarbon group having 1 to 12 carbon atoms or an aromatic hydrocarbon group having 6 to 12 carbon atoms. (However, at least two are hydrogen atoms and d ′ is an integer of 0 to 100)
(E-2) Branched organohydrogen (poly) siloxane represented by the following formula (6):

(In the formula, R ⁸ is, independently of each other, a substituted or unsubstituted saturated hydrocarbon group having 1 to 12 carbon atoms or an aromatic hydrocarbon group having 6 to 12 carbon atoms, and q is an integer of 1 to 3) Is)
(E-3) Organohydrogenpolysiloxane represented by the following formula (7):
(R ⁷ ₃ SiO _1/2 ) _{r ′} (R ⁷ ₂ SiO _2/2 ) _{s ′} (R ⁷ SiO _3/2 ) _{t ′} (SiO _4/2 ) _{u ′}
(7)
(In the formula, R ⁷ is a group independently selected from a hydrogen atom and a substituted or unsubstituted saturated hydrocarbon group having 1 to 12 carbon atoms or an aromatic hydrocarbon group having 6 to 12 carbon atoms. Where at least two are hydrogen atoms, r ′ is an integer from 0 to 50, s ′ is an integer from 0 to 100, t ′ is an integer from 0 to 100, and u ′ is an integer from 1 to 100 2 ≦ r ′ + s ′ ≦ 150, 2 ≦ r ′ + s ′ + t ′ + u ′ ≦ 250)
The ratio of the total number of hydrosilyl groups in component (B) and component (E) to the total number of alkenyl groups in component (A) or in component (A) and component (D) is 0. 4 to 4 and the amount of the component (E) relative to the total mass of the component (B) and the component (E) is 5 to 95%.   A semiconductor device provided with the hardened | cured material obtained by hardening | curing the addition-curable silicone composition of any one of Claims 1-6.   The semiconductor device according to claim 7, wherein the semiconductor device includes a semiconductor element, and the semiconductor element is covered with the cured product.   The semiconductor device according to claim 8, wherein the semiconductor element is a light emitting element.