WO2015030259A1 - One-part curable silicone composition and optical semiconductor device - Google Patents

One-part curable silicone composition and optical semiconductor device Download PDF

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Publication number
WO2015030259A1
WO2015030259A1 PCT/JP2014/073113 JP2014073113W WO2015030259A1 WO 2015030259 A1 WO2015030259 A1 WO 2015030259A1 JP 2014073113 W JP2014073113 W JP 2014073113W WO 2015030259 A1 WO2015030259 A1 WO 2015030259A1
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groups
component
curable silicone
mol
silicone composition
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French (fr)
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Akiko Nabeta
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DuPont Toray Specialty Materials KK
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Dow Corning Toray Co Ltd
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Priority to CN201480045060.3A priority Critical patent/CN105473664A/en
Priority to KR1020167007805A priority patent/KR20160049539A/en
Priority to JP2016504824A priority patent/JP2016534160A/en
Publication of WO2015030259A1 publication Critical patent/WO2015030259A1/en
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
    • C08L83/04—Polysiloxanes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/04—Polysiloxanes
    • C08G77/06—Preparatory processes
    • C08G77/08—Preparatory processes characterised by the catalysts used
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/04—Polysiloxanes
    • C08G77/12—Polysiloxanes containing silicon bound to hydrogen
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/04—Polysiloxanes
    • C08G77/20—Polysiloxanes containing silicon bound to unsaturated aliphatic groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
    • C08G77/80—Siloxanes having aromatic substituents, e.g. phenyl side groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/16—Nitrogen-containing compounds
    • C08K5/17—Amines; Quaternary ammonium compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/54—Silicon-containing compounds
    • C08K5/541—Silicon-containing compounds containing oxygen
    • C08K5/5415—Silicon-containing compounds containing oxygen containing at least one Si—O bond
    • C08K5/5419—Silicon-containing compounds containing oxygen containing at least one Si—O bond containing at least one Si—C bond
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/56—Organo-metallic compounds, i.e. organic compounds containing a metal-to-carbon bond
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details
    • H10H20/85—Packages
    • H10H20/852—Encapsulations
    • H10H20/854—Encapsulations characterised by their material, e.g. epoxy or silicone resins
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
    • H10W90/00—Package configurations
    • H10W90/701—Package configurations characterised by the relative positions of pads or connectors relative to package parts
    • H10W90/751—Package configurations characterised by the relative positions of pads or connectors relative to package parts of bond wires
    • H10W90/756—Package configurations characterised by the relative positions of pads or connectors relative to package parts of bond wires between a chip and a stacked lead frame, conducting package substrate or heat sink

Definitions

  • the present invention relates to an one-part curable silicone composition that is cured by a hydrosilylation reaction, and an optical semiconductor device produced using the composition.
  • Curable silicone compositions having aryl groups that are cured by a hydrosilylation reaction are used as a sealant of elements in optical semiconductor devices such as luminous diodes (LED) and as a protector because they are rapidly cured by heating to form a highly transparent cured product with a high refractive index.
  • LED luminous diodes
  • curable silicone compositions include a curable silicone composition comprising: a branched-chain organopolysiloxane having phenyl groups and alkenyl groups, an organopolysiloxane with at least two silicon-bonded hydrogen atoms in a molecule, and a hydrosilylation reaction catalyst (see Patent Document 1); a curable silicone compositions comprising: a straight-chain organopolysiloxane having at least two alkenyl groups and at least one aryl group in a molecule, a branched-chain
  • organopolysiloxane having at least one alkenyl group and at least one aryl group in a molecule an organopolysiloxane having at least two silicon-bonded hydrogen atoms in a molecule, and a hydrosilylation reaction catalyst
  • a curable silicone compositions comprising: a straight-chain organopolysiloxane having at least one alkenyl group and containing diphenylsiloxane units in a molecule, a branched-chain organopolysiloxane having vinyl groups and phenyl groups, an organopolysiloxane having diorganohydrogensiloxy groups, and a hydrosilylation reaction catalyst (see Patent Document 3).
  • curable silicone compositions are provided in two components that are divided into an organopolysiloxane having silicon-bonded hydrogen atoms and a hydrosilylation reaction catalyst in order to ensure storage stability.
  • the two components must be uniformly mixed for use. Consequently, the inherent performance would not be adequately demonstrated if the mixture ratio of the two components should vary or if the two components are not adequately mixed.
  • Patent Document 1 Japanese Unexamined Patent Application Publication No. HI 1- 001619
  • Patent Document 2 Japanese Unexamined Patent Application Publication No. 2004- 143361
  • Patent Document 3 Japanese Unexamined Patent Application Publication No. 2005- 076003
  • An object of the present invention is to provide an one-part curable silicone composition with storage stability as well as an optical semiconductor device with outstanding reliability that uses the composition.
  • the one-part curable silicone composition of the present invention is characterized by comprising:
  • R 1 represent the same or different monovalent hydrocarbon groups, but in a molecule at least 5 mol% of R 1 are alkenyl groups and at least 30 mol% of R 1 are aryl groups;
  • X represents a hydrogen atom or alkyl group;
  • a represents a positive integer
  • b represents 0 or a positive integer
  • c represents 0 or a positive integer
  • d represents a number from 0 to 0.3
  • e represents a number from 0 to 0.4
  • b/a is a number from 0 to 10
  • R represent the same or different monovalent hydrocarbon groups lacking aliphatic unsaturated bonds, but in a molecule at least 15 mol% of R 2 are aryl groups; and m is an integer from 1 to 100;
  • R 3 represent the same or different hydrogen atoms or alkyl groups having from 1 to 4 carbons; and R 4 represents an alkylene group having from 2 to 4 carbons, in an amount of 0.5 to 1 ,000 ppm in terms of mass units to component (B).
  • Component (ii) in component (B) is preferably a platinum-alkenylsiloxane complex, and component (iii) is preferably ⁇ , ⁇ , ⁇ ', ⁇ '-tetramethylethylene diamine.
  • composition preferably further contains (C) a straight-chain
  • organopolysiloxane represented by the general formula:
  • R 5 represent the same or different monovalent hydrocarbon groups, but in a molecule at least two of R 5 are alkenyl groups and at least 20 mol% of R 5 are aryl groups; and n is an integer from 5 to 1 ,000, in an amount of not more than 100 parts by mass per 100 parts by mass of component (A).
  • composition preferably further contains (D) a branched-chain
  • organopolysiloxane represented by the average unit formula:
  • R 6 represents the same or different monovalent hydrocarbon groups lacking aliphatic unsaturated bonds, but in a molecule at least 10 mol% of R 6 are aryl groups;
  • Y represents a hydrogen atom or an alkyl group; and
  • f represents a positive integer, g
  • the one-part curable silicone composition of the present invention has storage stability and the optical semiconductor device of the present invention has reliability.
  • FIG. 1 is a cross-sectional view of an LED that is an example of an optical semiconductor device of the present invention. Detailed Description of the Invention
  • Component (A) is a main material of this composition and is a branched-chain organopolysiloxane represented by the average unit formula:
  • R 1 represent the same or different monovalent hydrocarbon groups.
  • alkyl groups such as methyl groups, ethyl groups, propyl groups, butyl groups, pentyl groups, hexyl groups, heptyl groups; alkenyl groups such as vinyl groups, allyl groups, butenyl groups, pentenyl groups, hexenyl groups; aryl groups such as phenyl groups, tolyl groups, xylyl groups; aralkyl groups such as benzyl groups or phenethyl groups; halogenated alkyl groups such as 3-chloropropyl groups, and 3,3,3-trifluoropropyl groups.
  • At least 5 mol% of R 1 in a molecule are alkenyl groups, and preferably at least 10 mol% of R 1 are alkenyl groups. Furthermore, at least 30 mol% of R 1 are aryl groups, and preferably at least 40 mol% of R 1 are aryl groups. That is because of a decrease in attenuation of light from the resulting cured product due to refraction, reflection, or dispersion.
  • X in the formula represents hydrogen atoms or alkyl groups. Examples of such alkyl groups include methyl groups, ethyl groups, propyl groups, and butyl groups.
  • Component (B) is a crosslinking agent of this composition and a catalyst that stimulates this crosslinking. It is a reaction mixture or a mixture derived by mixing (i) an organopolysiloxane represented by the general formula:
  • R in the formula in component (i) represent the same or different monovalent hydrocarbon groups lacking aliphatic unsaturated bonds.
  • Specific examples include alkyl groups such as methyl groups, ethyl groups, propyl groups, butyl groups, pentyl groups, hexyl groups, heptyl groups; aryl groups such as phenyl groups, tolyl groups, xylyl groups; aralkyl groups such as benzyl groups or phenethyl groups; halogenated alkyl groups such as 3-chloropropyl groups, and 3,3,3-trifluoropropyl groups.
  • At least 15 mol% of R 2 in a molecule are aryl groups, and preferably at least 20 mol% of R 2 or at least 30 mol% of R 2 are aryl groups. That is because of a decrease in attenuation of light from the resulting cured product due to refraction, reflection, or dispersion.
  • m represents an integer from 1 to 100, preferably an integer from 1 to 50, and most preferably an integer from 1 to 20. That is because the operational efficiency for handling the resultant composition is enhanced if m is not more than the maximum of the aforementioned range.
  • component (ii) examples include platinum catalysts, rhodium catalysts and palladium catalysts, and the platinum catalysts are preferable.
  • platinum catalysts include fine platinum powder, chloroplatinic acid, alcohol solutions of
  • chloroplatinic acid a platinum-alkenylsiloxane complex, a platinum-olefin complex, and a platinum-carbonyl complex.
  • a platinum-alkenylsiloxane complex is preferable.
  • alkenylsiloxane examples include l,3-divinyl-l ,l ,3,3-tetramethyldisiloxane, 1 ,3,5,7- tetramethyl-l ,3,5,7-tetravinyl cyclotetrasiloxane, alkenylsiloxanes having part of the methyl groups of these alkenylsiloxane substituted by ethyl groups, phenyl groups, or the like, and alkenylsiloxanes having vinyl groups of these alkenylsiloxane substituted by allyl groups, hexenyl groups, or the like.
  • l,3-divinyl-l ,l ,3,3-tetramethyldisiloxane is preferable because of its good stability.
  • alkenylsiloxanes such as 1 ,3-diallyl-l ,1 ,3,3-tetramethyldisiloxane, 1 ,3-divinyl-l ,3-dimethyl-l ,3-diphenyldisiloxane, 1 ,3-divinyl-l ,1 ,3,3-tetraphenyldisiloxane, l ,3,5,7-tetramethyl-l ,3,5,7-tetravinyl cyclotetrasiloxane or organosiloxane oligomers such as dimethylsiloxane oligomers are preferably added to this platinum-alkenylsiloxane complex to further enhance its stability.
  • the amount of component (ii) that is added is an amount such that catalyst metal contained in component (ii) reach from 0.01 to 1 ,000 ppm in mass units in
  • the amount is from 0.1 to 1 ,000 ppm, or from 0.1 to 500 ppm.
  • R 3 in component (iii) represent the same or different hydrogen atoms or alkyl groups having from 1 to 4 carbons.
  • alkyl group examples include methyl groups, ethyl groups, propyl groups, and butyl groups.
  • R 4 represents an alkylene group having from 2 to 4 carbons. Examples of this alkylene group include ethylene groups, propylene groups, methylmethylene groups and methyl ethylene groups.
  • component (iii) examples include ⁇ , ⁇ , ⁇ ', ⁇ '-tetramethyl ethylene diamine, ⁇ , ⁇ -dimethylethylene diamine, ⁇ , ⁇ -diethylethylene diamine, N,N-dibutylethylene diamine, ⁇ , ⁇ , ⁇ ', ⁇ '-tetraethylethylene diamine.
  • Component (iii) is known as a reaction inhibitor in hydrosilylation reacting curable silicone compositions, but while this component is merely contained alone in conventional compositions, the storage stability of an one-part curable silicone
  • composition was found to be markedly enhanced by premixture of this composition with component (i) and component (ii).
  • the amount of component (iii) that is added is from 0.5 to 1 ,000 ppm of mass units in component (B), and preferably from 1 to 400 ppm.
  • Component (B) is prepared by mixing the aforementioned component (i) to component (iii), but these components may be heated or cured at room temperature after mixture.
  • component (B) in this composition is from 0.1 to 5 mols of silicon-bonded hydrogen atoms in component (i) per one mol of alkenyl groups in component (A), and preferably from 0.5 to 2 mols. This is because the present
  • composition is satisfactorily cured if the content of component (B) is not less than the lower limit of the above-mentioned range, and heat resistance of an obtained cured product is improved if the content of component (B) is not more than the upper limit of the above- mentioned range.
  • This composition may include (C) a straight-chain organopolysiloxane represented by the general formula:
  • R 5 represent the same or different monovalent hydrocarbon groups. Examples are groups similar to those presented in the aforementioned R 1 . ⁇ However, at least two of R 5 in a molecule are alkenyl groups. In addition, at least 20 mol% of R 5 in a molecule are aryl groups. Preferably, at least 30 mol% of R 5 are aryl groups, and more preferably at least 40 mol% of R 5 are aryl groups. That is because of a decrease in attenuation of light from the resultant cured product due to refraction, reflection, or dispersion. Furthermore, n in the formula is an integer from 5 to 1,000, preferably an integer from 5 to 100, and more preferably an integer from 5 to 50.
  • component (C) there is no specific limitation on the content of component (C) in this composition, but it preferably is not more than 100 parts by mass per 100 parts by mass of component (A), and more preferably not more than 70 parts by mass so that the hardness of the resultant cured product is not markedly reduced. Furthermore, the content preferably exceeds 1 part by mass per 100 parts by mass of component (A), and more preferably 5 parts by mass, so as to suitably adjust the hardness of the resulting cured product and so as to adjust the hardness of the obtained cured product.
  • this composition may also include (D) a branched-chain organopolysiloxane represented by the average unit formula:
  • R 6 in the formula represent the same or different monovalent hydrocarbon groups lacking aliphatic unsaturated bonds. Specific examples are groups similar to those presented in the aforementioned R . However, at least 10 mol% of R in a molecule are aryl groups. At least 15 mol% of R 6 are preferably aryl groups, and more preferably at least 20 mol% of R 6 are aryl groups. That is because of a decrease in attenuation of light from the resulting cured product due to refraction, reflection, or dispersion. Furthermore, Y in the formula represents a hydrogen atom or alkyl group. Examples of the alkyl group include methyl groups, ethyl groups, propyl groups and butyl groups.
  • f represents a positive integer
  • g represents a positive integer
  • h represents 0 or a positive integer
  • i represents 0 or a positive integer
  • j represents a number from 0 to 0.3
  • k represents a number from 0 to 0.4
  • f/g represents a number from 0.1 to 4
  • h/g represents a number from 0 to 10
  • i/g represents a number from 0 to 50
  • component (D) there is no specific limitation on the content of component (D) in this composition.
  • the content of silicon-bonded hydrogen atoms in component (D) is from 1 to 20 mol%, preferably from 2 to 20 mol%, and more preferably from 2 to 10% of the total of silicon-bonded hydrogen atoms in components (B) and (D) in order to impart moderate hardness and mechanical strength to the resulting cured product. That is because mechanical strength can be imparted to the resulting cured product if the content of component (D) exceeds the minimum in the aforementioned range. On the other hand, moderate hardness can be imparted to the resulting cured product if the content is equal to or below the maximum in the aforementioned range.
  • a reaction inhibitor for example, an alkyne alcohol such as 2-methyl-3-butyn-
  • the present composition may also contain an adhesion-imparting agent for improving the adhesion of the composition.
  • Preferred adhesion-imparting agents are organosilicon compounds having at least one alkoxy group bonded to a silicon atom in a molecule. This alkoxy group is exemplified by a methoxy group, an ethoxy group, a propoxy group, a butoxy group, and a methoxy ethoxy group; and the methoxy group is particularly preferred.
  • non-alkoxy groups bonded to a silicon atom of this organosilicon compound are exemplified by substituted or non-substituted monovalent hydrocarbon groups such as alkyl groups, alkenyl groups, aryl groups, aralkyl groups, halogenated alkyl groups and the like; glycidoxyalkyl groups such as a 3-glycidoxypropyl group, a 4-glycidoxybutyl group, and the like; epoxycyclohexylalkyl groups such as a 2- (3,4-epoxycyclohexyl)ethyl group, a 3-(3,4-epoxycyclohexyl)propyl group, and the like; oxiranylalkyl groups such as a 4-oxiranyl butyl group, an 8-oxiranyloctyl group, and the like; acrylic group-containing monovalent organic groups such as a 3-methacryloxypropyl group and the like; and a hydrogen atom.
  • This organosilicon compound preferably has groups that can react with alkenyl groups or silicon-bonded hydrogen atoms in this composition. Specificly, it preferably has silicon-bonded alkenyl groups or silicon- bonded hydrogen atoms. Moreover, due to the ability to impart good adhesion with respect to various types of substrates, this organosilicon compound preferably has at least one epoxy group-containing monovalent organic group in a molecule.
  • This type of organosilicon compound is exemplified by organosilane compounds, organosiloxane oligomers, and alkyl silicates.
  • organosiloxane oligomer or alkyl silicate is exemplified by a linear structure, partially branched linear structure, branched chain structure, ring-shaped structure, and net-shaped structure.
  • a linear chain structure, branched chain structure, and net-shaped structure are particularly preferred.
  • silane compounds such as 3- glycidoxypropyl trimethoxysilane, 2-(3,4-epoxycyclohexyl)ethyl trimethoxysilane, 3- methacryloxypropyl trimethoxysilane, and the like; siloxane compounds having at least one of silicon-bonded alkenyl groups or silicon-bonded hydrogen atoms, and at least one silicon-bonded alkoxy group in a molecule; mixtures of a silane compound or siloxane compound having at least one silicon-bonded alkoxy group and a siloxane compound having at least one silicon-bonded hydroxyl group and at least one silicon-bonded alkenyl group in a molecule; and methyl polysilicate, ethyl polysilicate, and epoxy group- containing ethyl polysilicate.
  • adhesion- imparting agent There is no specific limitation on the content of adhesion- imparting agent in this composition. A range of 0.01 to 10 parts by mass of
  • an inorganic filler such as silica, glass, alumina or zinc oxide; an organic resin fine powder of a polymethacrylate resin and the like; a heat-resistant agent, a dye, a pigment, a flame retardant, a solvent and the like may be incorporated as optional components in the present composition at levels that do not impair the object of the present invention.
  • Curing of this composition is promoted by heating, and heating to a
  • temperature range of 50 to 200°C is preferable to accelerate curing.
  • this composition has adequate storage stability even at a temperature of 25°C, but cooling to a temperature 5°C or less is preferable.
  • the optical semiconductor device of the present invention is characterized in that its optical semiconductor element is sealed, protected or covered wit the cured product of the aforementioned one-part curable silicone composition.
  • a light emitting diode element is an example of this optical semiconductor element.
  • Another example of such an optical semiconductor element is a light emitting diode (LED).
  • FIG. 1 illustrates a cross-sectional view of one example of a surface mounted LED of this device.
  • Optical semiconductor element 1 is die bonded onto lead frame 2 in the LED device illustrated in FIG. 1.
  • This optical semiconductor element 1 and lead frame 3 are wire bonded by bonding wire 4.
  • frame material 5 is installed about the periphery of this optical semiconductor element 1.
  • Optical semiconductor element 1 within this frame material 5 is sealed by cured product 6 of the single-fluid type curable silicone composition according to the present invention.
  • Semiconductor element 1 is die bonded to lead frame 2 in a method of manufacturing the surface mounted LED illustrated in FIG. 1. This optical
  • semiconductor element 1 and lead frame 3 are wire bonded by a gold bonding wire 4, followed by packing the single-fluid type curable silicone composition according to the present invention in this frame material 5. Then, optical semiconductor element 1 is sealed by cured product 6 by heating to a temperature in the range of 50 to 200°C.
  • the change in torque of the one-part curable silicone composition at 150°C was measured using an Alpha Technologies Rheometer MDR2000P. The duration from immediately after torque measurement was started until the torque value reached IdNm is exhibited by TS-1 (seconds), and this TS-1 was used as the indicator of the curing speed.
  • the viscosity change of the one-part curable silicone composition at 25 °C was measured under conditions of shear rate: 20 (1/s) using an AR 550 from TA Instruments.
  • Table 1 shows the characteristics of the composition.
  • ⁇ , ⁇ , ⁇ ', ⁇ '-tetramethylethylene diamine (amount of 25 ppm in mass units to this mixture) were uniformly mixed and cured for one day at room temperature.
  • Table 1 shows the characteristics of the composition.
  • the one-part curable silicone composition of the present invention has outstanding storage stability, does not require mixture prior to use, and forms cured product with a high refractive index and high optical permeability. Consequently, it is ideal as a sealant, adhesive, coating agent or protector of optical semiconductor elements. Description of Symbols

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Abstract

The present invention relates to an one-part curable silicone composition comprising: (A) a branched-chain organopolysiloxane having alkenyl groups and aryl groups; and (B) a mixture in which component (i) an organopolysiloxane represented by the general formula: HR2 2SiO(R2 2SiO)mSiR2 2H (in the formula, R2 represent the same or different monovalent hydrocarbon groups lacking aliphatic unsaturated bonds, but at least 15 mol% of R2 in a molecule are aryl groups; and m is an integer from 1 to 100), (ii) a hydrosilylation reaction metal-based catalyst, and (iii) an amine compound represented by the general formula: R3 2N-R4-NR3 2 (in the formula, R3 represent the same or different hydrogen atoms or alkyl groups having from 1 to 4 carbons; and R4 represents an alkylene group having from 2 to 4 carbons) are premixed. The one-part curable silicone composition has storage stability.

Description

DESCRIPTION
ONE-PART CURABLE SILICONE COMPOSITION
AND OPTICAL SEMICONDUCTOR DEVICE
Technical Field
[0001] The present invention relates to an one-part curable silicone composition that is cured by a hydrosilylation reaction, and an optical semiconductor device produced using the composition.
[0002] Priority is claimed on Japanese Patent Application No. 2013-179426, filed on August 30, 2013, the contents of which is incorporated herein by reference. Background Art
[0003] Curable silicone compositions having aryl groups that are cured by a hydrosilylation reaction are used as a sealant of elements in optical semiconductor devices such as luminous diodes (LED) and as a protector because they are rapidly cured by heating to form a highly transparent cured product with a high refractive index.
[0004] Examples of such curable silicone compositions include a curable silicone composition comprising: a branched-chain organopolysiloxane having phenyl groups and alkenyl groups, an organopolysiloxane with at least two silicon-bonded hydrogen atoms in a molecule, and a hydrosilylation reaction catalyst (see Patent Document 1); a curable silicone compositions comprising: a straight-chain organopolysiloxane having at least two alkenyl groups and at least one aryl group in a molecule, a branched-chain
organopolysiloxane having at least one alkenyl group and at least one aryl group in a molecule, an organopolysiloxane having at least two silicon-bonded hydrogen atoms in a molecule, and a hydrosilylation reaction catalyst (see Patent Document 2); a curable silicone compositions comprising: a straight-chain organopolysiloxane having at least one alkenyl group and containing diphenylsiloxane units in a molecule, a branched-chain organopolysiloxane having vinyl groups and phenyl groups, an organopolysiloxane having diorganohydrogensiloxy groups, and a hydrosilylation reaction catalyst (see Patent Document 3).
[0005] Such curable silicone compositions are provided in two components that are divided into an organopolysiloxane having silicon-bonded hydrogen atoms and a hydrosilylation reaction catalyst in order to ensure storage stability. The two components must be uniformly mixed for use. Consequently, the inherent performance would not be adequately demonstrated if the mixture ratio of the two components should vary or if the two components are not adequately mixed. Thus, an one-part curable silicone
composition that has storage stability and that does not require mixture prior to use is desired. Prior Art Documents
Patent Documents
[0006]
Patent Document 1 : Japanese Unexamined Patent Application Publication No. HI 1- 001619
Patent Document 2: Japanese Unexamined Patent Application Publication No. 2004- 143361
Patent Document 3: Japanese Unexamined Patent Application Publication No. 2005- 076003
Summary of Invention
Technical Problem
[0007] An object of the present invention is to provide an one-part curable silicone composition with storage stability as well as an optical semiconductor device with outstanding reliability that uses the composition.
Solution to Problem
[0008] The one-part curable silicone composition of the present invention is characterized by comprising:
(A) a branched-chain organopolysiloxane represented by the average unit formula:
(R1Si03/2)a (R1 2Si02/2)b (R1 3SiOi/2)c (Si04/2)d (XOi/2)e
wherein, R1 represent the same or different monovalent hydrocarbon groups, but in a molecule at least 5 mol% of R1 are alkenyl groups and at least 30 mol% of R1 are aryl groups; X represents a hydrogen atom or alkyl group; a represents a positive integer, b represents 0 or a positive integer, c represents 0 or a positive integer, d represents a number from 0 to 0.3, e represents a number from 0 to 0.4, b/a is a number from 0 to 10, c/a is a number from 0 to 5, and a + b + c + d = l ; and
(B) a mixture in which components (i) to (iii) are premixed
(i) an organopolysiloxane represented by the general formula:
HR2 2SiO(R2 2SiO)mSiR2 2H wherein, R represent the same or different monovalent hydrocarbon groups lacking aliphatic unsaturated bonds, but in a molecule at least 15 mol% of R2 are aryl groups; and m is an integer from 1 to 100;
(ii) a hydrosilylation reaction metal-based catalyst, in an amount that catalytic metal is 0.01 to 1 ,000 ppm in terms of mass units to component (B); and
(iii) an amine compound represented by the general formula:
R3 2N-R4-NR32
wherein, R3 represent the same or different hydrogen atoms or alkyl groups having from 1 to 4 carbons; and R4 represents an alkylene group having from 2 to 4 carbons, in an amount of 0.5 to 1 ,000 ppm in terms of mass units to component (B).
[0009] Component (ii) in component (B) is preferably a platinum-alkenylsiloxane complex, and component (iii) is preferably Ν,Ν,Ν',Ν'-tetramethylethylene diamine.
[0010] This composition preferably further contains (C) a straight-chain
organopolysiloxane represented by the general formula:
Figure imgf000004_0001
wherein, R5 represent the same or different monovalent hydrocarbon groups, but in a molecule at least two of R5 are alkenyl groups and at least 20 mol% of R5 are aryl groups; and n is an integer from 5 to 1 ,000, in an amount of not more than 100 parts by mass per 100 parts by mass of component (A).
[0011] This composition preferably further contains (D) a branched-chain
organopolysiloxane represented by the average unit formula:
(HR6 2Si01 /2)f (R6Si03/2)g (R6 2Si02/2)h (R6 3SiOl /2)i (Si04/2)j (Y01/2)k
wherein, R6 represents the same or different monovalent hydrocarbon groups lacking aliphatic unsaturated bonds, but in a molecule at least 10 mol% of R6 are aryl groups; Y represents a hydrogen atom or an alkyl group; and f represents a positive integer, g
represents a positive integer, h represents 0 or a positive integer, i represents 0 or a positive integer, j represents a number from 0 to 0.3, k represents a number from 0 to 0.4, and f/g is a number from 0.1 to 4, h/g is a number from 0 to 10, i/g is a number from 0 to 5, and f + g + h + i + j = l , in an amount that silicon-bonded hydrogen atoms in component (D) is preferably from 1 to 20 mol% of total silicon-bonded hydrogen atoms in components (B) and (D). [0012] The optical semiconductor device of the present invention, in which the optical semiconductor element is sealed, protected, or covered with the cured product of the aforementioned one-part curable silicone composition.
Effects of Invention
[0013] The one-part curable silicone composition of the present invention has storage stability and the optical semiconductor device of the present invention has reliability.
Brief Description of the Drawings
[0014] FIG. 1 is a cross-sectional view of an LED that is an example of an optical semiconductor device of the present invention. Detailed Description of the Invention
[0015] First, the one-part curable silicone composition of the present invention will be described in detail.
[0016] Component (A) is a main material of this composition and is a branched-chain organopolysiloxane represented by the average unit formula:
(R1Si03/2)a (R1 2Si02/2)b (R1 3Si01/2)c (Si04/2)d (XOi/2)e
[0017] In the formula, R1 represent the same or different monovalent hydrocarbon groups. Specific examples include alkyl groups such as methyl groups, ethyl groups, propyl groups, butyl groups, pentyl groups, hexyl groups, heptyl groups; alkenyl groups such as vinyl groups, allyl groups, butenyl groups, pentenyl groups, hexenyl groups; aryl groups such as phenyl groups, tolyl groups, xylyl groups; aralkyl groups such as benzyl groups or phenethyl groups; halogenated alkyl groups such as 3-chloropropyl groups, and 3,3,3-trifluoropropyl groups. However, at least 5 mol% of R1 in a molecule are alkenyl groups, and preferably at least 10 mol% of R1 are alkenyl groups. Furthermore, at least 30 mol% of R1 are aryl groups, and preferably at least 40 mol% of R1 are aryl groups. That is because of a decrease in attenuation of light from the resulting cured product due to refraction, reflection, or dispersion. Furthermore, X in the formula represents hydrogen atoms or alkyl groups. Examples of such alkyl groups include methyl groups, ethyl groups, propyl groups, and butyl groups.
[0018] Furthermore, a in the formula represents a positive integer, b represents 0 or a positive integer, c represents 0 or a positive integer, d represents a number from 0 to 0.3, e represents a number from 0 to 0.4, and b/a represents a number from 0 to 10, c/a represents a number from 0 to 5 and a + b + c + d = l . [0019] Component (B) is a crosslinking agent of this composition and a catalyst that stimulates this crosslinking. It is a reaction mixture or a mixture derived by mixing (i) an organopolysiloxane represented by the general formula:
HR2 2SiO(R2 2SiO)mSiR2 2H
with (ii) a hydrosilylation reaction metal-based catalyst and (iii) an amine compound represented by the general formula:
R4 2N-R5-NR4 2
[0020] R in the formula in component (i) represent the same or different monovalent hydrocarbon groups lacking aliphatic unsaturated bonds. Specific examples include alkyl groups such as methyl groups, ethyl groups, propyl groups, butyl groups, pentyl groups, hexyl groups, heptyl groups; aryl groups such as phenyl groups, tolyl groups, xylyl groups; aralkyl groups such as benzyl groups or phenethyl groups; halogenated alkyl groups such as 3-chloropropyl groups, and 3,3,3-trifluoropropyl groups. However, at least 15 mol% of R2 in a molecule are aryl groups, and preferably at least 20 mol% of R2 or at least 30 mol% of R2 are aryl groups. That is because of a decrease in attenuation of light from the resulting cured product due to refraction, reflection, or dispersion. Furthermore, in the formula, m represents an integer from 1 to 100, preferably an integer from 1 to 50, and most preferably an integer from 1 to 20. That is because the operational efficiency for handling the resultant composition is enhanced if m is not more than the maximum of the aforementioned range.
[0021] Examples of component (ii) include platinum catalysts, rhodium catalysts and palladium catalysts, and the platinum catalysts are preferable. Examples of such platinum catalysts include fine platinum powder, chloroplatinic acid, alcohol solutions of
chloroplatinic acid, a platinum-alkenylsiloxane complex, a platinum-olefin complex, and a platinum-carbonyl complex. A platinum-alkenylsiloxane complex is preferable.
Examples of the alkenylsiloxane include l,3-divinyl-l ,l ,3,3-tetramethyldisiloxane, 1 ,3,5,7- tetramethyl-l ,3,5,7-tetravinyl cyclotetrasiloxane, alkenylsiloxanes having part of the methyl groups of these alkenylsiloxane substituted by ethyl groups, phenyl groups, or the like, and alkenylsiloxanes having vinyl groups of these alkenylsiloxane substituted by allyl groups, hexenyl groups, or the like. l,3-divinyl-l ,l ,3,3-tetramethyldisiloxane is preferable because of its good stability.
[0022] In addition, alkenylsiloxanes such as 1 ,3-diallyl-l ,1 ,3,3-tetramethyldisiloxane, 1 ,3-divinyl-l ,3-dimethyl-l ,3-diphenyldisiloxane, 1 ,3-divinyl-l ,1 ,3,3-tetraphenyldisiloxane, l ,3,5,7-tetramethyl-l ,3,5,7-tetravinyl cyclotetrasiloxane or organosiloxane oligomers such as dimethylsiloxane oligomers are preferably added to this platinum-alkenylsiloxane complex to further enhance its stability.
[0023] The amount of component (ii) that is added is an amount such that catalyst metal contained in component (ii) reach from 0.01 to 1 ,000 ppm in mass units in
component (B). Preferably, the amount is from 0.1 to 1 ,000 ppm, or from 0.1 to 500 ppm.
[0024] In the formula, R3 in component (iii) represent the same or different hydrogen atoms or alkyl groups having from 1 to 4 carbons. Examples of this alkyl group include methyl groups, ethyl groups, propyl groups, and butyl groups. In addition, R4 represents an alkylene group having from 2 to 4 carbons. Examples of this alkylene group include ethylene groups, propylene groups, methylmethylene groups and methyl ethylene groups.
[0025] Examples of component (iii) include Ν,Ν,Ν',Ν'-tetramethyl ethylene diamine, Ν,Ν-dimethylethylene diamine, Ν,Ν-diethylethylene diamine, N,N-dibutylethylene diamine, Ν,Ν,Ν',Ν'-tetraethylethylene diamine.
[0026] Component (iii) is known as a reaction inhibitor in hydrosilylation reacting curable silicone compositions, but while this component is merely contained alone in conventional compositions, the storage stability of an one-part curable silicone
composition was found to be markedly enhanced by premixture of this composition with component (i) and component (ii).
[0027] The amount of component (iii) that is added is from 0.5 to 1 ,000 ppm of mass units in component (B), and preferably from 1 to 400 ppm.
[0028] Component (B) is prepared by mixing the aforementioned component (i) to component (iii), but these components may be heated or cured at room temperature after mixture.
[0029] The content of component (B) in this composition is from 0.1 to 5 mols of silicon-bonded hydrogen atoms in component (i) per one mol of alkenyl groups in component (A), and preferably from 0.5 to 2 mols. This is because the present
composition is satisfactorily cured if the content of component (B) is not less than the lower limit of the above-mentioned range, and heat resistance of an obtained cured product is improved if the content of component (B) is not more than the upper limit of the above- mentioned range.
[0030] This composition may include (C) a straight-chain organopolysiloxane represented by the general formula:
Figure imgf000008_0001
in order to adjust the hardness of the obtained cured product.
[0031] In the formula, R5 represent the same or different monovalent hydrocarbon groups. Examples are groups similar to those presented in the aforementioned R1. · However, at least two of R5 in a molecule are alkenyl groups. In addition, at least 20 mol% of R5 in a molecule are aryl groups. Preferably, at least 30 mol% of R5 are aryl groups, and more preferably at least 40 mol% of R5 are aryl groups. That is because of a decrease in attenuation of light from the resultant cured product due to refraction, reflection, or dispersion. Furthermore, n in the formula is an integer from 5 to 1,000, preferably an integer from 5 to 100, and more preferably an integer from 5 to 50.
[0032] There is no specific limitation on the content of component (C) in this composition, but it preferably is not more than 100 parts by mass per 100 parts by mass of component (A), and more preferably not more than 70 parts by mass so that the hardness of the resultant cured product is not markedly reduced. Furthermore, the content preferably exceeds 1 part by mass per 100 parts by mass of component (A), and more preferably 5 parts by mass, so as to suitably adjust the hardness of the resulting cured product and so as to adjust the hardness of the obtained cured product.
[0033] Furthermore, this composition may also include (D) a branched-chain organopolysiloxane represented by the average unit formula:
(HR6 2SiO! /2)f (R6Si03/2)g (R6 2Si02/2)h (R6 3Si01 /2)i (Si04/2)j (Y01/2)k
in order to adjust the hardness of the resultant cured product and to impart mechanical strength.
[0034] R6 in the formula represent the same or different monovalent hydrocarbon groups lacking aliphatic unsaturated bonds. Specific examples are groups similar to those presented in the aforementioned R . However, at least 10 mol% of R in a molecule are aryl groups. At least 15 mol% of R6 are preferably aryl groups, and more preferably at least 20 mol% of R6 are aryl groups. That is because of a decrease in attenuation of light from the resulting cured product due to refraction, reflection, or dispersion. Furthermore, Y in the formula represents a hydrogen atom or alkyl group. Examples of the alkyl group include methyl groups, ethyl groups, propyl groups and butyl groups.
[0035] In the formula, f represents a positive integer, g represents a positive integer, h represents 0 or a positive integer, i represents 0 or a positive integer, j represents a number from 0 to 0.3, k represents a number from 0 to 0.4, and f/g represents a number from 0.1 to 4, h/g represents a number from 0 to 10, i/g represents a number from 0 to 50, and
f + g + h + i + j = l .
[0036] There is no specific limitation on the content of component (D) in this composition. The content of silicon-bonded hydrogen atoms in component (D) is from 1 to 20 mol%, preferably from 2 to 20 mol%, and more preferably from 2 to 10% of the total of silicon-bonded hydrogen atoms in components (B) and (D) in order to impart moderate hardness and mechanical strength to the resulting cured product. That is because mechanical strength can be imparted to the resulting cured product if the content of component (D) exceeds the minimum in the aforementioned range. On the other hand, moderate hardness can be imparted to the resulting cured product if the content is equal to or below the maximum in the aforementioned range.
[0037] A reaction inhibitor, for example, an alkyne alcohol such as 2-methyl-3-butyn-
2- ol, 3,5-dimethyl-l -hexyn-3-ol or 2-phenyl-3-butyn-2-ol; an ene-yne compound such as
3- methyl-3-penten-l-yne or 3,5-dimethyl-3-hexen-l-yne; or l ,3,5,7-tetramethyl-l ,3,5,7- tetravinylcyclotetrasiloxane, l ,3,5,7-tetramethyl-l ,3,5,7-tetrahexenylcyclotetrasiloxane or a benzotriazole may be incorporated as an optional component in the present composition. There is no specific limitation on the content of this reaction inhibitor, but a range of 0.0001 to 5 parts by mass per 100 parts by mass of this composition is preferable.
[0038] The present composition may also contain an adhesion-imparting agent for improving the adhesion of the composition. Preferred adhesion-imparting agents are organosilicon compounds having at least one alkoxy group bonded to a silicon atom in a molecule. This alkoxy group is exemplified by a methoxy group, an ethoxy group, a propoxy group, a butoxy group, and a methoxy ethoxy group; and the methoxy group is particularly preferred. Moreover, non-alkoxy groups bonded to a silicon atom of this organosilicon compound are exemplified by substituted or non-substituted monovalent hydrocarbon groups such as alkyl groups, alkenyl groups, aryl groups, aralkyl groups, halogenated alkyl groups and the like; glycidoxyalkyl groups such as a 3-glycidoxypropyl group, a 4-glycidoxybutyl group, and the like; epoxycyclohexylalkyl groups such as a 2- (3,4-epoxycyclohexyl)ethyl group, a 3-(3,4-epoxycyclohexyl)propyl group, and the like; oxiranylalkyl groups such as a 4-oxiranyl butyl group, an 8-oxiranyloctyl group, and the like; acrylic group-containing monovalent organic groups such as a 3-methacryloxypropyl group and the like; and a hydrogen atom. This organosilicon compound preferably has groups that can react with alkenyl groups or silicon-bonded hydrogen atoms in this composition. Specificly, it preferably has silicon-bonded alkenyl groups or silicon- bonded hydrogen atoms. Moreover, due to the ability to impart good adhesion with respect to various types of substrates, this organosilicon compound preferably has at least one epoxy group-containing monovalent organic group in a molecule. This type of organosilicon compound is exemplified by organosilane compounds, organosiloxane oligomers, and alkyl silicates. Molecular structure of the organosiloxane oligomer or alkyl silicate is exemplified by a linear structure, partially branched linear structure, branched chain structure, ring-shaped structure, and net-shaped structure. A linear chain structure, branched chain structure, and net-shaped structure are particularly preferred. This type of organosilicon compound is exemplified by silane compounds such as 3- glycidoxypropyl trimethoxysilane, 2-(3,4-epoxycyclohexyl)ethyl trimethoxysilane, 3- methacryloxypropyl trimethoxysilane, and the like; siloxane compounds having at least one of silicon-bonded alkenyl groups or silicon-bonded hydrogen atoms, and at least one silicon-bonded alkoxy group in a molecule; mixtures of a silane compound or siloxane compound having at least one silicon-bonded alkoxy group and a siloxane compound having at least one silicon-bonded hydroxyl group and at least one silicon-bonded alkenyl group in a molecule; and methyl polysilicate, ethyl polysilicate, and epoxy group- containing ethyl polysilicate. There is no specific limitation on the content of adhesion- imparting agent in this composition. A range of 0.01 to 10 parts by mass of this adhesion-imparting agent per 100 parts by mass of this composition is preferable.
[0039] Moreover, an inorganic filler such as silica, glass, alumina or zinc oxide; an organic resin fine powder of a polymethacrylate resin and the like; a heat-resistant agent, a dye, a pigment, a flame retardant, a solvent and the like may be incorporated as optional components in the present composition at levels that do not impair the object of the present invention.
[0040] Curing of this composition is promoted by heating, and heating to a
temperature range of 50 to 200°C is preferable to accelerate curing.
[0041] Furthermore, this composition has adequate storage stability even at a temperature of 25°C, but cooling to a temperature 5°C or less is preferable.
[0042] The optical semiconductor device of the present invention will now be explained in detail.
[0043] The optical semiconductor device of the present invention is characterized in that its optical semiconductor element is sealed, protected or covered wit the cured product of the aforementioned one-part curable silicone composition. A light emitting diode element is an example of this optical semiconductor element. Another example of such an optical semiconductor element is a light emitting diode (LED).
[0044] FIG. 1 illustrates a cross-sectional view of one example of a surface mounted LED of this device. Optical semiconductor element 1 is die bonded onto lead frame 2 in the LED device illustrated in FIG. 1. This optical semiconductor element 1 and lead frame 3 are wire bonded by bonding wire 4. In addition, frame material 5 is installed about the periphery of this optical semiconductor element 1. Optical semiconductor element 1 within this frame material 5 is sealed by cured product 6 of the single-fluid type curable silicone composition according to the present invention.
[0045] Semiconductor element 1 is die bonded to lead frame 2 in a method of manufacturing the surface mounted LED illustrated in FIG. 1. This optical
semiconductor element 1 and lead frame 3 are wire bonded by a gold bonding wire 4, followed by packing the single-fluid type curable silicone composition according to the present invention in this frame material 5. Then, optical semiconductor element 1 is sealed by cured product 6 by heating to a temperature in the range of 50 to 200°C.
Examples
[0046] The one-part curable silicone composition of the present invention as well as the optical semiconductor device are explained in detail through Examples. Note that the viscosity is the value obtained at 25°C. In the formula, Me, Ph, and Vi represent a methyl group, phenyl group and vinyl group respectively.
[0047] The characteristics of the one-part curable silicone composition are evaluated as follows.
[0048]
[Curing speed]
The change in torque of the one-part curable silicone composition at 150°C was measured using an Alpha Technologies Rheometer MDR2000P. The duration from immediately after torque measurement was started until the torque value reached IdNm is exhibited by TS-1 (seconds), and this TS-1 was used as the indicator of the curing speed.
[0049]
[Viscosity change]
The viscosity change of the one-part curable silicone composition at 25 °C was measured under conditions of shear rate: 20 (1/s) using an AR 550 from TA Instruments. [0050]
[Practical Example 1 ]
100 parts by mass of an organopolysiloxane represented by the formula:
HMe2SiO(Ph2SiO)SiMe2H
(content of silicon-bonded hydrogen atoms = 0.60% by mass, content of phenyl groups in all silicon-bonded organic groups = 33 mol%), a l ,3-divinyl-l ,l ,3,3-tetramethyldisiloxane complex of platinum (platinum metal at 12 ppm in mass units to this mixture), and Ν,Ν,Ν',Ν'-tetramethyl ethylene diamine (amount of 100 ppm in mass units to this mixture) were uniformly mixed and cured for one day at room temperature.
[0051] Next, 20 parts by mass of this mixture were uniformly mixed with 59 parts by mass of an organopolysiloxane represented by the average unit formula:
(PhSi03/2)o.75 (ViMe2SiO1/2)0 25
(vinyl group content = 5.6% by mass, content of vinyl groups in all silicon-bonded organic groups = 17 mol%, content of phenyl groups in all silicon-bonded organic groups = 50 mol%), 3 parts by mass of a branched-chain organopolysiloxane with number average molecular weight of 2,260 represented by the average unit formula:
(PhSi03/2)0. o (HMe2Si01/2)o.6o
(content of silicon-bonded hydrogen atoms = 0.65% by mass, content of phenyl groups in all silicon-bonded organic groups = 25 mol%), 18 parts by mass of an organopolysiloxane represented by the formula:
ViMe2SiO(PhMeSiO)26SiViMe2
(content of vinyl groups = 1.4% by mass, content of phenyl groups in all silicon-bonded organic groups = 45 mol%), and 0.2 parts by mass of tetramethyltetravinyl
cyclotetrasiloxane in the preparation of an one-part curable silicone composition. Table 1 shows the characteristics of the composition.
[0052]
[Practical Example 2]
100 parts by mass of an organopolysiloxane represented by the formula:
HMe2SiO(Ph2SiO)SiMe2H
(content of silicon-bonded hydrogen atoms = 0.60% by mass, content of phenyl groups in all silicon-bonded organic groups = 33 mol%), a l ,3-divinyl-l ,l ,3,3-tetramethyldisiloxane complex of platinum (platinum metal at 16 ppm in mass units to this mixture), and
Ν,Ν,Ν',Ν'-tetramethylethylene diamine (amount of 25 ppm in mass units to this mixture) were uniformly mixed and cured for one day at room temperature.
[0053] Next, 20 parts by mass of this mixture were uniformly mixed with 59 parts by mass of an organopolysiloxane represented by the average unit formula:
(PhSi03/2)o.75 (ViMe2SiOi/2)0.25
(vinyl group content = 5.6% by mass, content of vinyl groups in all silicon-bonded organic groups = 17 mol%, content of phenyl groups in all silicon-bonded organic groups = 50 mol%), 3 parts by mass of an organopolysiloxane with number average molecular weight of 2,260 represented by the average unit formula:
(PhSi03 2)o.40 (HMe2SiOi/2)0.6o
(content of silicon-bonded hydrogen atoms = 0.65% by mass, content of phenyl groups in all silicon-bonded organic groups = 25 mol%), 18 parts by mass of an organopolysiloxane represented by the formula:
ViMe2SiO(PhMeSiO)26SiViMe2
(content of vinyl groups = 1.4% by mass, content of phenyl groups in all silicon-bonded organic groups = 45 mol%), and 0.2 parts by mass of tetramethyltetravinyl
cyclotetrasiloxane in the preparation of an one-part curable silicone composition. Table 1 shows the characteristics of the composition.
[0054]
[Comparative Example 1]
20 parts by mass of an organopolysiloxane represented by the formula:
HMe2SiO(Ph2SiO)SiMe2H
(content of silicon-bonded hydrogen atoms = 0.60% by mass, content of phenyl groups in all silicon-bonded organic groups = 33 mol%), 59 parts by mass of an organopolysiloxane represented by the average unit formula:
(PhSi03/2)o.75 (ViMe2SiO1/2)0.25
(vinyl group content = 5.6% by mass, content of vinyl groups in all silicon-bonded organic groups = 17 mol%, content of phenyl groups in all silicon-bonded organic groups = 50 mol%), 3 parts by mass of an organopolysiloxane with number average molecular weight of 2,260 represented by the average unit formula:
(PhSi03/2)o.4o (HMe2Si01/2)o.60
(content of silicon-bonded hydrogen atoms = 0.65% by mass, content of phenyl groups in all silicon-bonded organic groups = 25 mol%), 18 parts by mass of an organopolysiloxane represented by the formula: ViMe2SiO(PhMeSiO)26SiViMe2
(content of vinyl groups = 1.4% by mass, content of phenyl groups in all silicon-bonded organic groups = 45 mol%), a l,3-divinyl-l,l ,3,3-tetramethyldisiloxane complex of platinum (platinum metal at 2.6 ppm in mass units to this mixture), 0.2 parts by mass of 1- ethenyl-l-cyclohexanol and 0.2 parts by mass of tetramethyltetravinyl cyclotetrasiloxane were uniformly mixed in the preparation of an one-part curable silicone composition. Table 1 shows the characteristics of the composition.
[0055] [Table 1]
Figure imgf000014_0001
Industrial Applicability
[0056] The one-part curable silicone composition of the present invention has outstanding storage stability, does not require mixture prior to use, and forms cured product with a high refractive index and high optical permeability. Consequently, it is ideal as a sealant, adhesive, coating agent or protector of optical semiconductor elements. Description of Symbols
[0057]
1 Optical semiconductor element
2 Lead frame
3 Lead frame
4 Bonding wire
5 Frame material
6 Cured product of one-part curable silicone composition

Claims

1. An one-part curable silicone composition comprising:
(A) an organopolysiloxane represented by the average unit formula:
(R'SiC^a (R^SiO^b (R^SiO^c (Si04/2)d (X01/2)e
wherein, R represent the same or different monovalent hydrocarbon groups, but in a molecule at least 5 mol% of R1 are alkenyl groups and at least 30 mol% of R1 are aryl groups; X represents a hydrogen atom or alkyl group; a represents a positive integer, b represents 0 or a positive integer, c represents 0 or a positive integer, d represents a number from 0 to 0.3, e represents a number from 0 to 0.4, b/a is a number from 0 to 10, c/a is a number from 0 to 5, and a + b + c + d = l); and
(B) a mixture in which components (i) to (iii) are premixed
(i) an organopolysiloxane represented by the general formula:
HR2 2SiO(R2 2SiO)mSiR2 2H
wherein, R represent the same or different monovalent hydrocarbon groups lacking aliphatic unsaturated bonds, but at least 15 mol% of R2 in a molecule are aryl groups; and m is an integer from 1 to 100,
(ii) a hydrosilylation reaction metal-based catalyst, in an amount that catalytic metal is 0.01 to 1 ,000 ppm in terms of mass units to component (B); and
(iii) an amine compound represented by the general formula:
Figure imgf000015_0001
wherein, R3 represent the same or different hydrogen atoms or alkyl groups having from 1 to 4 carbons; and R4 represents an alkylene group having from 2 to 4 carbons, in an amount of 0.5 to 1 ,000 ppm in terms of mass units to component (B).
2. The one-part curable silicone composition according to Claim 1 , wherein
component (ii) in component (B) is a platinum-alkenylsiloxane complex.
3. The one-part curable silicone composition according to Claim 1 or 2, wherein component (iii) in component (B) is a Ν,Ν,Ν',Ν'-tetramethylethylene diamine.
4. The one-part curable silicone composition according to any one of Claims 1 to 3, further comprising (C) a straight-chain organopolysiloxane represented by the general formula:
R5 3SiO(R5 2SiO)nSiR5 3 wherein, R5 represent the same or different monovalent hydrocarbon groups, but in one molecule at least two of R5 are alkenyl groups and at least 20 mol% of R5 are aryl groups; and n is an integer from 5 to 1,000, in an amount of not more than 100 parts by mass per 100 parts by mass of component (A).
5. The one-part curable silicone composition according to any one of Claims 1 to 4, further comprising (D) a branched-chain organopolysiloxane represented by the average unit formula:
(HR6 2Si01/2)f (R6Si03/2)g (R6 2Si02/2)h (R6 3Si01/2), (Si04/2)j (Y01/2)k
wherein, R6 represents the same or different monovalent hydrocarbon groups lacking aliphatic unsaturated bonds, but in a molecule at least 10 mol% of R6 are aryl groups; Y represents a hydrogen atom or an alkyl group; and f represents a positive integer, g represents a positive integer, h represents 0 or a positive integer, i represents 0 or a positive integer, j represents a number from 0 to 0.3, k represents a number from 0 to 0.4, and f/g is a number from 0.1 to 4, h/g is a number from 0 to 10, i/g is a number from 0 to 5, and f + g + h + i + j = l , in an amount that silicon-bonded hydrogen atoms in component (D) is preferably from 1 to 20 mol% of total silicon-bonded hydrogen atoms in components (B) and (D).
6. An optical semiconductor device in which an optical semiconductor element is sealed, protected, or covered with a cured product of the one-part curable silicone composition described in any one of Claims 1 to 5.
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