WO2013002052A1 - 光反射用硬化性樹脂組成物及び光半導体装置 - Google Patents
光反射用硬化性樹脂組成物及び光半導体装置 Download PDFInfo
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- WO2013002052A1 WO2013002052A1 PCT/JP2012/065488 JP2012065488W WO2013002052A1 WO 2013002052 A1 WO2013002052 A1 WO 2013002052A1 JP 2012065488 W JP2012065488 W JP 2012065488W WO 2013002052 A1 WO2013002052 A1 WO 2013002052A1
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Images
Classifications
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- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
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- C08K5/0025—Crosslinking or vulcanising agents; including accelerators
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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- C08L51/04—Compositions of graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers grafted on to rubbers
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/28—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection
- H01L23/29—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the material, e.g. carbon
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/28—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection
- H01L23/31—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the arrangement or shape
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- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2217—Oxides; Hydroxides of metals of magnesium
- C08K2003/222—Magnesia, i.e. magnesium oxide
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- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2244—Oxides; Hydroxides of metals of zirconium
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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
- C08L2312/00—Crosslinking
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/4805—Shape
- H01L2224/4809—Loop shape
- H01L2224/48091—Arched
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/481—Disposition
- H01L2224/48151—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/48221—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/48245—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic
- H01L2224/48247—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being metallic connecting the wire to a bond pad of the item
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
Definitions
- the present invention relates to a light-reflective curable resin composition and an optical semiconductor device. More specifically, a light-reflective curable resin composition that has high light reflectivity, excellent heat resistance and light resistance, and gives a tough cured product, and at least a reflector made of an optical semiconductor element and the cured product.
- the present invention relates to an optical semiconductor device.
- Such a light emitting device generally has an optical semiconductor element and a transparent resin that protects the periphery of the optical semiconductor element, and further improves the efficiency of extracting light emitted from the optical semiconductor element.
- a light emitting device having a reflector (reflecting material) for reflecting light is widely used.
- the reflector is required to have high light reflectivity and to continuously exhibit such high light reflectivity.
- a resin composition in which an inorganic filler or the like is dispersed in a polyamide resin (polyphthalamide resin) having a terephthalic acid unit as an essential constituent unit is known (Patent Literature). 1 to 3).
- the reflector made of the above polyamide resin is deteriorated sufficiently, particularly in a light emitting device using a high-output blue light semiconductor or white light semiconductor as a light source, such as yellowing over time due to light or heat emitted from the optical semiconductor element. Therefore, there was a problem that it was not possible to maintain high light reflectivity. Furthermore, with the adoption of lead-free solder, the heating temperature in the reflow process (solder reflow process) during the manufacture of the light-emitting device tends to be higher, and the above-mentioned reflector may be deteriorated over time due to the heat applied in such a manufacturing process. There was also a problem that the light reflectivity was deteriorated due to deterioration.
- the above reflector is less susceptible to cracking when subjected to stress due to cutting or temperature change (for example, heating at a very high temperature such as a reflow process or a cooling cycle). Such a characteristic is sometimes referred to as “crack resistance”). This is because if the reflector is cracked, the light reflectivity is lowered (that is, the light extraction efficiency is lowered), and it is difficult to ensure the reliability of the light emitting device.
- an object of the present invention is to provide a curable resin composition that has a high light reflectivity, is excellent in heat resistance and light resistance, is strong, and provides a cured product in which the light reflectivity is less likely to deteriorate over time.
- Another object of the present invention is to provide a highly reliable optical semiconductor device in which the luminance of light hardly decreases with time.
- the present inventor has cured a curable resin composition containing an alicyclic epoxy compound, rubber particles, a white pigment, a curing agent, and a curing accelerator as essential components.
- a cured product of a curable resin composition containing an alicyclic epoxy compound, rubber particles, a white pigment, and a curing catalyst as essential components has high light reflectivity, and is heat and light resistant. It was found that it was excellent and strong, and the light reflectivity was hardly lowered with time, and the present invention was completed.
- the present invention includes an alicyclic epoxy compound (A), rubber particles (B), a white pigment (C), a curing agent (D), and a curing accelerator (E), for light reflection.
- a curable resin composition is provided.
- the present invention also provides a light-reflective curable resin composition
- a light-reflective curable resin composition comprising an alicyclic epoxy compound (A), rubber particles (B), a white pigment (C), and a curing catalyst (F). To do.
- the rubber particles (B) are composed of a polymer having (meth) acrylic acid ester as an essential monomer component, and have hydroxyl groups and / or carboxyl groups on the surface, and the rubber particles (B) are average particles.
- the light-reflective curable resin composition having a diameter of 10 to 500 nm and a maximum particle diameter of 50 to 1000 nm is provided.
- the white pigment (C) is at least one selected from the group consisting of aluminum oxide, magnesium oxide, antimony oxide, titanium oxide, zirconium oxide, and inorganic hollow particles. Offer things.
- the light-reflective curable resin composition is provided wherein the white pigment (C) has a center particle size of 0.1 to 50 ⁇ m.
- curable resin composition for light reflection which is a curable resin composition for LED packages.
- the present invention also provides an optical semiconductor device comprising at least an optical semiconductor element and a reflector made of a cured product of the light reflecting curable resin composition.
- the curable resin composition for light reflection of the present invention has the above-described configuration, the cured product obtained by curing the curable resin composition has high light reflectivity, and further has heat resistance and light resistance. Since it is excellent and strong and is not easily cracked, the light reflectivity is hardly lowered with time. For this reason, the curable resin composition for light reflection of this invention can be preferably used for various uses related to an optical semiconductor device.
- a reflector (reflective material) made of a cured product of the light-reflective curable resin composition of the present invention can continue to exhibit high light reflectivity for a long period of time, and thus is provided with an optical semiconductor element and the reflector.
- a semiconductor device (light emitting device) can exhibit high reliability as a long-life optical semiconductor device.
- the curable resin composition for light reflection of the present invention comprises an alicyclic epoxy compound (A), rubber particles (B), a white pigment (C), a curing agent (D), and a curing accelerator (E) as essential components. Or a curable resin composition containing alicyclic epoxy compound (A), rubber particles (B), white pigment (C), and curing catalyst (F) as essential components.
- the “curable resin composition for light reflection” means a curable resin composition capable of forming a cured product having high light reflectivity by curing, specifically, For example, it means a curable resin composition capable of forming a cured product having a reflectance of 80% or more with respect to light having a wavelength of 450 nm.
- the alicyclic epoxy compound (A) which is an essential component of the curable resin composition for light reflection of the present invention, is composed of two adjacent carbon atoms and oxygen atoms constituting the alicyclic ring.
- An alicyclic compound having an epoxy group which can be arbitrarily selected from well-known and conventional ones.
- the alicyclic epoxy compound preferably exhibits a liquid state at normal temperature (25 ° C.) from the viewpoint of workability during preparation and casting.
- an alicyclic epoxy compound represented by the following formula (1) is particularly preferable in terms of heat resistance and light resistance (particularly ultraviolet resistance).
- Y represents a single bond or a linking group.
- the linking group a divalent group having one or more atoms
- examples of the linking group include, for example, a divalent hydrocarbon group, a carbonyl group (—CO— ), An ether bond (—O—), an ester bond (—COO—), an amide bond (—CONH—), a carbonate bond (—OCOO—), and a group in which a plurality of these are linked.
- Examples of the divalent hydrocarbon group include a linear or branched alkylene group having 1 to 18 carbon atoms and a divalent alicyclic hydrocarbon group. Furthermore, examples of the linear or branched alkylene group having 1 to 18 carbon atoms include methylene, methylmethylene, dimethylmethylene, ethylene, propylene, and trimethylene groups. Examples of the divalent alicyclic hydrocarbon group include 1,2-cyclopentylene, 1,3-cyclopentylene, cyclopentylidene, 1,2-cyclohexylene, and 1,3-cyclohexane. And divalent cycloalkylene groups (including cycloalkylidene groups) such as xylene, 1,4-cyclohexylene and cyclohexylidene groups.
- Typical examples of the alicyclic epoxy compound represented by the above formula (1) include compounds represented by the following formulas (1a) to (1j).
- n1 to n8 represent an integer of 1 to 30.
- —O—R—O— represents a residue of a diol.
- R is a divalent hydrocarbon group; a divalent group in which a plurality of divalent hydrocarbon groups are bonded via one or more of linking groups such as an ether bond, an ester bond, an amide bond, and a carbonyl group.
- Examples of the divalent hydrocarbon group include the same groups as the divalent hydrocarbon group in Y above.
- alicyclic epoxy compounds can be used alone or in combination of two or more.
- commercially available products such as trade names “Celoxide 2021P” and “Celoxide 2081” (manufactured by Daicel Chemical Industries, Ltd.) can also be used.
- the usage-amount (compounding quantity) of the alicyclic epoxy compound (A) in the curable resin composition for light reflections of this invention is not specifically limited,
- the epoxy group contained in the curable resin composition for light reflections is contained.
- the amount is preferably 60 to 100% by weight, more preferably 80 to 100% by weight, based on the total amount of the compound (total epoxy group-containing compound) (100% by weight).
- the amount used is less than 60% by weight, the heat resistance and light resistance of the cured product tend to decrease.
- the rubber particles (B) that are essential components of the curable resin composition for light reflection of the present invention are particles having rubber elasticity.
- the rubber particles (B) are not particularly limited, but may be rubber particles composed of a polymer (acrylic polymer) having (meth) acrylic acid ester as an essential monomer component in terms of heat resistance and light resistance. preferable. Further, the rubber particles (B) are excellent in dispersibility and easily obtain an effect of improving toughness (crack resistance improvement), and at least one layer covering the core portion with rubber elasticity. Rubber particles (core-shell type rubber particles) having a multilayer structure (core-shell structure) composed of a shell layer are preferable. In addition, these rubber particles can be used individually or in combination of 2 or more types.
- the rubber particles (B) are preferably core-shell type rubber particles composed of a polymer (acrylic polymer) containing (meth) acrylic acid ester as an essential monomer component.
- the monomer components of the polymer constituting the core portion having rubber elasticity include methyl (meth) acrylate, ethyl (meth) acrylate, and (meth) acrylic acid.
- a (meth) acrylic acid ester such as butyl is essential.
- monomer components other than (meth) acrylic acid esters include aromatic vinyl such as styrene and ⁇ -methylstyrene, nitriles such as acrylonitrile and methacrylonitrile, conjugated dienes such as butadiene and isoprene, ethylene , Propylene, isobutene and the like. These monomer components can be used alone or in combination of two or more.
- the monomer component of the polymer constituting the rubber-elastic core part of the rubber particle (B) is selected from aromatic vinyl, nitrile, and conjugated diene together with (meth) acrylic ester. It is preferable to include one or two or more of them.
- the polymer constituting the core part include binary copolymers such as (meth) acrylic acid ester / aromatic vinyl and (meth) acrylic acid ester / conjugated diene; (meth) acrylic acid ester / aromatic vinyl / Ternary copolymers such as conjugated dienes are mentioned.
- the polymer constituting the core part may contain silicone such as polydimethylsiloxane and polyphenylmethylsiloxane, polyurethane, and the like.
- the monomer component constituting the core portion having rubber elasticity of the rubber particle (B) is divinylbenzene, allyl (meth) acrylate, ethylene glycol di (meth) acrylate, diallyl male in addition to the above monomer components.
- a reactive crosslinking monomer having two or more reactive functional groups may be contained in one monomer (one molecule) corresponding to ate, triallyl cyanurate, diallyl phthalate, butylene glycol diacrylate and the like.
- the core portion having rubber elasticity is, among other things, a (meth) acrylate / aromatic vinyl binary copolymer (particularly a butyl acrylate / styrene binary copolymer). It is preferable that it is a core part comprised from the polymer.
- the glass transition temperature of the polymer constituting the rubber-elastic core part of the rubber particles (B) is not particularly limited, but is ⁇ 100 to 10 ° C. from the viewpoint of improving toughness (improving crack resistance). It is preferably -80 to -10 ° C, more preferably -60 to -20 ° C. By setting the glass transition temperature in the above range, the toughness of the cured product can be improved.
- the glass transition temperature can be measured using, for example, various thermal analyzers (for example, a differential scanning calorimeter (DSC), a thermomechanical analyzer (TMA), etc.).
- the core part having rubber elasticity of the rubber particles (B) can be produced by a commonly used method, for example, by a method of polymerizing the above monomers by an emulsion polymerization method. .
- the whole amount of the monomer may be charged at once and may be polymerized, or after polymerizing a part of the monomer, the remainder may be added continuously or intermittently to polymerize, Furthermore, a polymerization method using seed particles may be used.
- the rubber particle which does not have a core-shell structure as a rubber particle (B)
- the rubber particle etc. which consist only of the said core part which has the said rubber elasticity can be used, for example.
- the shell layer of the rubber particles (B) is preferably made of a polymer different from the polymer constituting the core portion. Moreover, it is preferable that a shell layer has a hydroxyl group and / or a carboxyl group (any one or both of a hydroxyl group and a carboxyl group) as a functional group which can react with an alicyclic epoxy compound (A). That is, the rubber particle (B) preferably has a hydroxyl group and / or a carboxyl group as a functional group capable of reacting with the alicyclic epoxy compound (A) on the surface.
- the presence of hydroxyl groups and / or carboxyl groups on the surface of the rubber particles (B) can improve the adhesion at the interface with the alicyclic epoxy compound (A), and the shell layer
- a tough (particularly, excellent crack resistance) cured product is obtained.
- cured material can also be prevented.
- the monomer component constituting the shell layer of the rubber particle (B) (core-shell type rubber particle) is a (meth) acrylic acid ester such as methyl (meth) acrylate, ethyl (meth) acrylate, or butyl (meth) acrylate. It is preferable to make it an essential component.
- the shell layer has a (meth) acrylic acid ester other than butyl acrylate ( For example, it is preferable to use methyl (meth) acrylate, ethyl (meth) acrylate, butyl methacrylate, or the like.
- Examples of the monomer component that may be contained in addition to the (meth) acrylic acid ester include aromatic vinyl such as styrene and ⁇ -methylstyrene, nitrile such as acrylonitrile, methacrylonitrile, and the like.
- the monomer is contained alone or in combination of two or more kinds together with (meth) acrylic acid ester. It is preferable.
- hydroxyalkyl (meth) acrylate such as 2-hydroxyethyl (meth) acrylate
- monomers corresponding to ⁇ , ⁇ -unsaturated acids such as (meth) acrylic acid, ⁇ , ⁇ -unsaturated acid anhydrides such as maleic anhydride, and the like.
- the rubber particle (B) (core-shell type rubber particle) contains, as a monomer component constituting the shell layer, one or more selected from the above monomers together with (meth) acrylic acid ester.
- the shell layer of the rubber particles (B) (core-shell type rubber particles) is, for example, (meth) acrylic acid ester / aromatic vinyl / hydroxyalkyl (meth) acrylate, (meth) acrylic acid ester / aromatic vinyl / ⁇ .
- the shell layer is preferably composed of a terpolymer such as, ⁇ -unsaturated acid.
- the monomer component constituting the shell layer of the rubber particles (B) is divinylbenzene, allyl (meth) acrylate, ethylene glycol di (meth) acrylate, in addition to the above monomers, in the same manner as the core portion.
- a reactive crosslinking monomer having two or more reactive functional groups may be contained in one monomer (one molecule) corresponding to diallyl maleate, triallyl cyanurate, diallyl phthalate, butylene glycol diacrylate, and the like.
- the glass transition temperature of the polymer constituting the shell layer of the rubber particles (B) is not particularly limited, but is 20 to 200 ° C. from the viewpoint of improvement in dispersibility and improvement in toughness (improvement in crack resistance). It is preferably 40 to 180 ° C, more preferably 60 to 160 ° C. By setting the glass transition temperature in the above range, toughness can be improved.
- a method of coating the core portion with the shell layer for example, a method of coating the surface of the core portion having rubber elasticity obtained by the above method by applying a copolymer constituting the shell layer, by the above method
- examples thereof include a graft polymerization method in which the obtained core portion having rubber elasticity is used as a trunk component and each component constituting the shell layer is used as a branch component.
- the average particle size of the rubber particles (B) is not particularly limited, but is preferably 10 to 500 nm, more preferably 20 to 400 nm.
- the average particle diameter exceeds 500 nm, the effect of improving toughness is difficult to obtain, or the dispersibility is reduced because it is agglomerated and difficult to knead, and the moldability of the light-reflective curable resin composition tends to decrease.
- the average particle diameter is less than 10 nm, sufficient effects of the rubber particles are not exhibited, and the toughness tends to decrease.
- the maximum particle size of the rubber particles (B) is not particularly limited, but is preferably 50 to 1000 nm, and more preferably 100 to 800 nm.
- the maximum particle diameter exceeds 1000 nm, the effect of improving toughness is difficult to obtain, or the dispersibility is difficult to aggregate and difficult to knead, and the moldability of the curable resin composition for light reflection tends to decrease.
- the maximum particle diameter is less than 50 nm, sufficient effects of the rubber particles are not exhibited, and the toughness tends to decrease.
- the usage-amount (blending amount) of the rubber particle (B) in the curable resin composition for light reflection of this invention is not specifically limited, The whole quantity of the compound containing the epoxy group contained in the curable resin composition for light reflections.
- the amount is preferably 1 to 50 parts by weight, more preferably 3 to 40 parts by weight, based on 100 parts by weight of (total epoxy group-containing compound).
- the amount used is less than 1 part by weight, the effect of improving toughness tends to be difficult to obtain.
- the amount used exceeds 50 parts by weight, it is difficult to knead and the defoaming property and dispersibility tend to be lowered.
- the rubber particles (B) may be used by dispersing in advance into other components when blending each component constituting the curable resin composition for light reflection of the present invention.
- the rubber particles (B) are used by being previously dispersed in the alicyclic epoxy compound (A) (the rubber particles (B) are used in the alicyclic epoxy compound (A).
- the dispersed composition is sometimes referred to as “rubber particle dispersed epoxy compound”).
- the rubber particle-dispersed epoxy compound is obtained by dispersing rubber particles (B) in an alicyclic epoxy compound (A).
- the amount of the rubber particles (B) in the rubber particle-dispersed epoxy compound may be the total amount of the rubber particles (B) constituting the light-reflective curable resin composition, or may be a partial amount. Good.
- the amount of the alicyclic epoxy compound (A) constituting the rubber particle-dispersed epoxy compound is the total amount of the alicyclic epoxy compound (A) constituting the curable resin composition for light reflection of the present invention. Alternatively, a partial amount may be used. Although not particularly limited, the amount of the alicyclic epoxy compound (A) constituting the rubber particle-dispersed epoxy compound is the total amount of the alicyclic epoxy compound (A) contained in the light-reflective curable resin composition (100% by weight). ) Is preferably 30 to 100% by weight, more preferably 50 to 100% by weight.
- the content of the rubber particles (B) in the rubber particle-dispersed epoxy compound can be appropriately adjusted as necessary, and is not particularly limited. It is preferably 5 to 30% by weight, more preferably 1 to 20% by weight.
- the viscosity of the rubber particle-dispersed epoxy compound is not particularly limited, but the viscosity at 25 ° C. (viscosity (25 ° C.)) is preferably 400 mPa ⁇ s to 50,000 mPa ⁇ s, more preferably 500 mPa ⁇ s to 10000 mPa ⁇ s. It is. When the viscosity (25 ° C.) of the rubber particle-dispersed epoxy compound is less than 400 mPa ⁇ s, the moldability tends to decrease.
- the viscosity of the rubber particle-dispersed epoxy compound can be adjusted by using (in combination with) a reactive diluent.
- a reactive diluent an aliphatic polyglycidyl ether having a viscosity at room temperature (25 ° C.) of 200 mPa ⁇ s or less can be preferably used.
- Examples of the aliphatic polyglycidyl ether having a viscosity (25 ° C.) of 200 mPa ⁇ s or less include cyclohexanedimethanol diglycidyl ether, cyclohexanediol diglycidyl ether, neopentyl glycol diglycidyl ether, and 1,6-hexanediol diglycidyl ether. , Trimethylolpropane triglycidyl ether, polypropylene glycol diglycidyl ether, and the like. These reactive diluents can be used alone or in combination of two or more.
- the amount of the reactive diluent used can be appropriately adjusted and is not particularly limited, but is preferably 30 parts by weight or less, more preferably 25 parts by weight or less, with respect to 100 parts by weight of the total amount of the rubber particle-dispersed epoxy compound. (For example, 5 to 25 parts by weight). When the amount used exceeds 30 parts by weight, it tends to be difficult to obtain desired performance such as toughness (improvement of crack resistance).
- the production method of the rubber particle-dispersed epoxy compound is not particularly limited, and a well-known and commonly used method can be used.
- the rubber particles (B) are dehydrated and dried to form a powder
- the rubber particles (B) are mixed and dispersed in the alicyclic epoxy compound (A), or an emulsion of the rubber particles (B) and the alicyclic epoxy compound (A).
- the method of directly mixing and dehydrating can be used.
- the white pigment (C) which is an essential component of the curable resin composition for light reflection of the present invention, plays a role of exerting high light reflectivity on a cured product obtained by curing the curable resin composition.
- white pigment (C) known or commonly used white pigments can be used, and are not particularly limited.
- Inorganic white pigments such as clay, boehmite, pseudoboehmite, inorganic oxides, metal salts such as alkaline earth metal salts; styrene resins, benzoguanamine resins, urea-formalin resins, melamine-formalin resins, amide resins, etc.
- Organic white pigments such as resin pigments (plastic pigments); hollow particles having a hollow structure (balloon structure), and the like. These white pigments can be used alone or in combination of two or more.
- Examples of the inorganic oxide include aluminum oxide (alumina), magnesium oxide, antimony oxide, titanium oxide (rutile type titanium oxide, anatase type titanium oxide, brookite type titanium oxide), zirconium oxide, zinc oxide, silicon oxide and the like.
- Examples of the alkaline earth metal salt include magnesium carbonate, calcium carbonate, barium carbonate, magnesium silicate, calcium silicate, magnesium hydroxide, magnesium phosphate, magnesium hydrogen phosphate, magnesium sulfate, calcium sulfate, and sulfuric acid. Examples include barium.
- Examples of the metal salt other than the alkaline earth metal salt include aluminum silicate, aluminum hydroxide, and zinc sulfide.
- metal oxides such as inorganic glass (for example, sodium silicate glass, aluminum silicate glass, sodium borosilicate glass, quartz, etc.), silica, alumina, calcium carbonate, barium carbonate, Inorganic hollow particles composed of inorganic substances such as nickel carbonate, calcium silicate and other metal salts (including natural products such as shirasu balloon); styrene resins, acrylic resins, silicone resins, acrylic-styrene resins, vinyl chloride -Based resins, vinylidene chloride-based resins, amide-based resins, urethane-based resins, phenol-based resins, styrene-conjugated diene-based resins, acrylic-conjugated diene-based resins, olefin-based polymers (including cross-linked products of these polymers), etc.
- inorganic glass for example, sodium silicate glass, aluminum silicate glass, sodium borosilicate glass, quartz, etc.
- silica
- the said hollow particle may be comprised from the single material, and may be comprised from 2 or more types of materials.
- the hollow portion of the hollow particles (the space inside the hollow particles) may be in a vacuum state or may be filled with a medium.
- the refractive index is low. Hollow particles filled with a medium (for example, an inert gas such as nitrogen or argon or air) are preferred.
- the white pigment (C) is subjected to known or conventional surface treatment (for example, surface treatment with a surface treatment agent such as a metal oxide, a silane coupling agent, a titanium coupling agent, an organic acid, a polyol, or silicone). It may be what was done. By performing such a surface treatment, the compatibility and dispersibility with other components in the curable resin composition for light reflection may be improved.
- a surface treatment agent such as a metal oxide, a silane coupling agent, a titanium coupling agent, an organic acid, a polyol, or silicone.
- the white pigment (C) is preferably an inorganic oxide or an inorganic hollow particle from the viewpoint of availability, heat resistance, and light resistance, and more preferably aluminum oxide, magnesium oxide, antimony oxide, titanium oxide, zirconium oxide, And one or more white pigments selected from the group consisting of inorganic hollow particles.
- the white pigment (C) is preferably titanium oxide because it has a higher refractive index.
- the shape of the white pigment (C) is not particularly limited, and examples thereof include a spherical shape, a crushed shape, a fiber shape, a needle shape, a scale shape, and a whisker shape. Among these, from the viewpoint of dispersibility of the white pigment (C), a spherical white pigment is preferable, and a true spherical white pigment (for example, a spherical white pigment having an aspect ratio of 1.2 or less) is particularly preferable.
- the center particle diameter of the white pigment (C) is not particularly limited, but is preferably 0.1 to 50 ⁇ m from the viewpoint of improving light reflectivity.
- the center particle diameter of the inorganic oxide is not particularly limited, but is preferably 0.1 to 50 ⁇ m, more preferably 0.1 to 30 ⁇ m, and still more preferably. It is 0.1 to 20 ⁇ m, particularly preferably 0.1 to 10 ⁇ m, and most preferably 0.1 to 5 ⁇ m.
- the center particle diameter of the hollow particles is not particularly limited, but is preferably 0.1 to 50 ⁇ m, more preferably 0.1 to 30 ⁇ m.
- the said center particle size means the particle size (median diameter) in the integrated value 50% in the particle size distribution measured by the laser diffraction / scattering method.
- the usage-amount (compounding quantity) of the white pigment (C) in the curable resin composition for light reflections of this invention is not specifically limited, The whole quantity of the compound containing the epoxy group contained in the curable resin composition for light reflections.
- the amount is preferably 80 to 500 parts by weight, more preferably 90 to 400 parts by weight, and still more preferably 100 to 380 parts by weight with respect to 100 parts by weight of (total epoxy group-containing compound). If the amount used is less than 80 parts by weight, the light reflectivity of the cured product tends to decrease. On the other hand, when the amount used exceeds 500 parts by weight, the toughness of the cured product tends to decrease.
- the white pigment (C) can be produced by a known or conventional production method.
- commercially available products can be used.
- the curing agent (D) has a function of curing a compound having an epoxy group. It does not specifically limit as a hardening
- curing agent can be used as a hardening
- the curing agent (D) is preferably an acid anhydride which is liquid at 25 ° C., for example, methyltetrahydrophthalic anhydride, methylhexahydrophthalic anhydride, dodecenyl succinic anhydride, methylendomethylenetetrahydrophthalic anhydride, etc. Can be mentioned.
- solid acid anhydrides for example, phthalic anhydride, tetrahydrophthalic anhydride, hexahydrophthalic anhydride, methylcyclohexene dicarboxylic acid anhydride, etc.
- solid acid anhydrides for example, phthalic anhydride, tetrahydrophthalic anhydride, hexahydrophthalic anhydride, methylcyclohexene dicarboxylic acid anhydride, etc.
- D curing agent
- the curing agent (D) commercially available products such as trade name “Rikacid MH-700” (manufactured by Shin Nippon Rika Co., Ltd.), trade name “HN-5500” (manufactured by Hitachi Chemical Co., Ltd.), etc. Can also be used.
- curing agent (D) in the curable resin composition for light reflections of this invention is not specifically limited, The whole quantity of the compound containing the epoxy group contained in the curable resin composition for light reflections.
- the amount is preferably 50 to 150 parts by weight, more preferably 52 to 145 parts by weight, and still more preferably 55 to 140 parts by weight with respect to 100 parts by weight of (total epoxy group-containing compound). More specifically, it is preferably used in a ratio of 0.5 to 1.5 equivalents per 1 equivalent of epoxy groups in all compounds having an epoxy group contained in the light reflecting curable resin composition.
- the curing accelerator (E) is a compound having a function of accelerating the curing rate when the compound having an epoxy group is cured by the curing agent (D).
- the curing accelerator (E) a well-known and commonly used curing accelerator can be used, and is not particularly limited.
- DBU 1,8-diazabicyclo [5.4.0] undecene-7
- DBN 1,5-diazabicyclo [4.3.0] nonene-5
- salts thereof eg, phosphonium salt, sulfonium salt, quaternary ammonium salt, iodonium salt
- tertiary amine such as benzyldimethylamine, 2,4,6-tris (dimethylaminomethyl) phenol, N, N-dimethylcyclohexylamine
- Imidazoles such as ethyl-4-methylimidazole and 1-cyanoethyl-2-ethyl-4-methylimidazole
- Ether phosphines such as triphenylphosphine; tetraphenylphosphonium
- the usage-amount (compounding quantity) of the hardening accelerator (E) in the curable resin composition for light reflections of this invention is not specifically limited, Of the compound containing the epoxy group contained in the curable resin composition for light reflections The amount is preferably 0.05 to 5 parts by weight, more preferably 0.1 to 3 parts by weight, still more preferably 0.2 to 3 parts by weight, particularly preferably 0 to 100 parts by weight of the total amount (total epoxy group-containing compound). .25 to 2.5 parts by weight.
- the usage-amount of a hardening accelerator (E) is less than 0.05 weight part, the hardening promotion effect may become inadequate.
- the curing catalyst (F) has a function of initiating polymerization of the epoxy compound in the curable resin composition for light reflection.
- a cationic polymerization initiator that generates cationic species by performing ultraviolet irradiation or heat treatment and initiates polymerization of an epoxy compound (particularly, an alicyclic epoxy compound (A)) is preferable.
- Examples of the cationic polymerization initiator that generates cationic species by ultraviolet irradiation include hexafluoroantimonate salts, pentafluorohydroxyantimonate salts, hexafluorophosphate salts, hexafluoroarsenate salts, and the like. These cationic polymerization initiators can be used alone or in combination of two or more. Examples of the cationic polymerization initiator include trade names “UVACURE1590” (manufactured by Daicel Cytec Co., Ltd.), trade names “CD-1010”, “CD-1011”, “CD-1012” (above, Sartomer, USA). Commercial products such as “Irgacure 264” (manufactured by Ciba Japan Co., Ltd.) and “CIT-1682” (manufactured by Nippon Soda Co., Ltd.) can be preferably used.
- Examples of the cationic polymerization initiator that generates cationic species by heat treatment include aryl diazonium salts, aryl iodonium salts, aryl sulfonium salts, and allene-ion complexes. These cationic polymerization initiators can be used alone or in combination of two or more. Examples of the cationic polymerization initiator include trade names “PP-33”, “CP-66”, “CP-77” (manufactured by ADEKA Corporation), trade names “FC-509” (3M Corporation).
- a chelate compound of a metal such as aluminum or titanium and a acetoacetate or diketone compound and a silanol such as triphenylsilanol or a chelate compound of a metal such as aluminum or titanium and acetoacetate or diketone and bisphenol S Compounds with phenols such as can also be used as the cationic polymerization initiator.
- the usage-amount (compounding quantity) of the curing catalyst (F) in the curable resin composition for light reflections of this invention is not specifically limited, The whole quantity of the compound containing the epoxy group contained in the curable resin composition for light reflections.
- the total epoxy group-containing compound is preferably 0.01 to 15 parts by weight, more preferably 0.01 to 12 parts by weight, still more preferably 0.05 to 10 parts by weight, and particularly preferably 0.00 to 100 parts by weight. 1 to 10 parts by weight.
- a glycidyl ether type epoxy compound having an aromatic ring such as bisphenol A type or bisphenol F type
- a glycidyl ether type epoxy compound having no aromatic ring such as hydrogenated bisphenol A type or aliphatic glycidyl type A glycidyl ester epoxy compound
- a glycidyl amine epoxy compound a polyol compound; an oxetane compound; and a vinyl ether compound.
- epoxy compound which is solid at normal temperature (25 ° C.) examples include solid bisphenol-type epoxy compounds, novolac-type epoxy compounds, glycidyl esters, triglycidyl isocyanurate, and 2,2-bis (hydroxymethyl) -1-butanol.
- epoxy compounds that are solid at room temperature (25 ° C.) include solid bisphenol-type epoxy compounds, novolac-type epoxy compounds, glycidyl esters, triglycidyl isocyanurate, and 2,2-bis (hydroxymethyl) -1-butanol.
- examples include 1,2-epoxy-4- (2-oxiranyl) cyclohexane adduct (trade name “EHPE3150”, manufactured by Daicel Chemical Industries, Ltd.). These epoxy compounds can be used alone or in combination of two or more.
- the light-reflective curable resin composition of the present invention contains a glycidyl ether-based epoxy compound having no aromatic ring and / or a polyol compound that exhibits a liquid state at 25 ° C. (excluding the polyether polyol). It is preferable in that toughness (crack resistance) can be improved without impairing high heat resistance. In particular, including a glycidyl ether epoxy compound having no aromatic ring does not impair high heat resistance and light resistance. It is preferable at the point which can improve toughness (crack resistance).
- the glycidyl ether epoxy compound having no aromatic ring include aliphatic glycidyl ether epoxy compounds and compounds obtained by nuclear hydrogenation of aromatic glycidyl ether epoxy compounds.
- the glycidyl ether-based epoxy compound having no aromatic ring include, for example, trade names “EPICLON 703”, “EPICLON 707”, “EPICLON 720”, “EPICLON 725” (manufactured by DIC Corporation), and trade names “YH-300”.
- the amount of the glycidyl ether epoxy compound having no aromatic ring is not particularly limited, but is preferably 10 to 60 parts by weight, more preferably 20 to 50 parts by weight based on 100 parts by weight of the alicyclic epoxy compound (A). Parts by weight.
- the polyol compound exhibiting a liquid state at 25 ° C. includes polyol compounds other than polyether polyols, and examples thereof include polyester polyols and polycarbonate polyols.
- polyester polyol examples include, for example, trade names "Placcel 205", “Placcel 205H”, “Placcel 205U”, “Placcel 205BA”, “Placcel 208", "Placcel 210", “Placcel 210CP”, “Placcel 210BA”, “Placcel 212”, “Plaxel 212CP”, “Plaxel 220”, “Plaxel 220CPB”, “Plaxel 220NP1”, “Plaxel 220BA”, “Plaxel 220ED”, “Plaxel 220EB”, “Plaxel 220EC”, “Plaxel 230”, “Plaxel 230CP”, “Plaxel 240”, “Plaxel 240CP”, “Plaxel 210N”, “Plaxel 220N”, “Plaxel L205AL”, “Plaxel L208” L, Plaxel L212AL, Plaxel L220AL, Plaxel L230AL, Plaxel 305, Plaxe
- polycarbonate polyol examples include trade names “Placcel CD205PL”, “Plaxel CD205HL”, “Plaxel CD210PL”, “Plaxel CD210HL”, “Plaxel CD220PL”, “Plaxel CD220HL” (manufactured by Daicel Chemical Industries, Ltd.) , “UH-CARB50”, “UH-CARB100”, “UH-CARB300”, “UH-CARB90 (1/3)”, “UH-CARB90 (1/1)”, “UC-CARB100” (and above)
- Commercial products such as “PCDL T4671”, “PCDL T4672”, “PCDL T5650J”, “PCDL T5651”, “PCDL T5652” (above, manufactured by Asahi Kasei Chemicals Co., Ltd.) Use It can be.
- the amount of the polyol compound that exhibits a liquid state at 25 ° C. is not particularly limited, but is preferably 5 to 50 parts by weight with respect to 100 parts by weight of the total amount of the alicyclic epoxy compound (A) and the rubber particles (B). More preferably, it is 10 to 40 parts by weight.
- the curable resin composition for light reflection of the present invention can use various additives within a range not impairing the effects of the present invention.
- a compound having a hydroxyl group such as ethylene glycol, diethylene glycol, propylene glycol, or glycerin
- the reaction can be allowed to proceed slowly.
- silicone and fluorine antifoaming agents, leveling agents, silane coupling agents such as ⁇ -glycidoxypropyltrimethoxysilane, surfactants, and fillers as long as the effects of the present invention are not adversely affected.
- Conventional additives such as a flame retardant, a colorant, an antioxidant, an ultraviolet absorber, an ion adsorbent, a pigment, and a release agent can be used.
- the amount of these additives used is preferably 5% by weight or less based on the total amount (100% by weight) of the light-reflective curable resin composition.
- the curable resin composition for light reflection of the present invention contains the alicyclic epoxy compound (A) and the white pigment (C) as essential components, it has high light reflectivity and excellent heat resistance and light resistance. Give a cured product. Moreover, the said hardened
- the method for producing the light-reflective curable resin composition of the present invention is not particularly limited, and known or commonly used methods can be applied. Specifically, for example, a predetermined amount of alicyclic epoxy compound (A), rubber particles (B), white pigment (C), curing agent (D), curing accelerator (E), and optional additives, Or a predetermined amount of alicyclic epoxy compound (A), rubber particles (B), white pigment (C), curing catalyst (F), and various additives, various mixers such as a dissolver, a homogenizer, Examples thereof include a method of stirring and mixing with a kneader, a roll, a bead mill, a self-revolving stirrer and the like. Further, after stirring and mixing, defoaming may be performed under vacuum. As described above, the rubber particles (B) may be used by dispersing all or part of them in the alicyclic epoxy compound (A) in advance.
- the light-reflective curable resin composition of the present invention can be made into a cured product by heating and / or curing by irradiation with light such as ultraviolet rays.
- the cured product obtained by curing the curable resin composition for light reflection of the present invention has high light reflectivity, is excellent in heat resistance and light resistance, and is tough. For this reason, the said hardened
- cured material (hardened
- the reflectance of light with a wavelength of 450 nm is 90% or more.
- it is 90.5% or more.
- the reflectance of light at 450 to 800 nm is preferably 90% or more, more preferably 90.5% or more.
- the reflectivity is measured by using, for example, a spectrophotometer (trade name “spectrophotometer UV-2450”, Co., Ltd., a cured product (thickness: 3 mm) of the light-reflective curable resin composition of the present invention. ) Manufactured by Shimadzu Corporation).
- the storage elastic modulus at 25 ° C. of the cured product is not particularly limited, but is preferably 1.0 to 60 GPa, more preferably 10 to 50 GPa.
- the storage elastic modulus at 25 ° C. is less than 1.0 GPa, there is a case where cracks are likely to occur during molding or processing of the test piece although there is flexibility.
- the storage elastic modulus at 25 ° C. exceeds 60 GPa, the toughness may be lowered and cracks may be easily generated.
- the storage elastic modulus at 260 ° C. of the cured product is not particularly limited, but is preferably 0.10 to 2.0 GPa, more preferably 0.20 to 1.8 GPa.
- the storage elastic modulus at 260 ° C. is less than 0.10 GPa, there is a possibility that the test piece may come off the fixing jig or break during measurement.
- the storage elastic modulus at 260 ° C. exceeds 2.0 GPa, the toughness may be lowered and cracks may be easily generated.
- the said storage elastic modulus uses the hardened
- the optical semiconductor device of the present invention is an optical semiconductor device including at least an optical semiconductor element as a light source and a reflector (reflecting material) made of a cured product of the curable resin composition for light reflection of the present invention.
- the reflector is a member for reflecting light emitted from the optical semiconductor element in the optical semiconductor device to increase the directivity and luminance of the light and improve the light extraction efficiency.
- FIG. 1 is a schematic view showing an example of an optical semiconductor device (an optical semiconductor device of the present invention) having a reflector formed from a cured product of the curable resin composition for light reflection of the present invention, and (a) is a perspective view.
- FIG. 2B shows a cross-sectional view. In FIG.
- the reflector 1 has a shape that surrounds the sealing resin 5 in a ring shape and is inclined so that the diameter of the ring increases upward.
- the light emitted from the LED element 3 is reflected by the surface (reflection surface) of the reflector 1, whereby the light from the optical semiconductor element 3 can be extracted with high efficiency.
- a known or conventional molding method can be used, and is not particularly limited. For example, transfer molding, compression molding, injection molding, LIM molding (injection molding), dam molding by dispensing, etc. The method is mentioned.
- the reflector can be formed by injecting the curable resin composition for light reflection of the present invention into a predetermined mold and curing by heating.
- the heating temperature is 80 to 200 ° C. (preferably 80 to 190 ° C., more preferably 80 to 180 ° C.)
- the heating time is 30 to 600 minutes (preferably 45 to 540 minutes, More preferably, it can be suitably adjusted within a range of 60 to 480 minutes.
- the heating temperature is increased, the heating time is shortened, and when the heating temperature is decreased, the heating time is preferably lengthened.
- the resin component may be decomposed.
- the heat curing treatment may be performed in one step, or may be performed in stages by performing heat treatment in multiple stages.
- the curing agent (D) when used, the first stage is heated at a temperature of 80 to 150 ° C. (preferably 100 to 140 ° C.) for 30 to 300 minutes (preferably 45 to 270 minutes). In the second stage, it is preferable to cure by heating at a temperature of 100 to 200 ° C. (preferably 110 to 180 ° C.) for 30 to 600 minutes (preferably 45 to 540 minutes). Further, for example, when the curing catalyst (F) is used, as the first stage, it is heated at a temperature of 30 to 150 ° C.
- the optical semiconductor device of the present invention has at least a reflector made of a cured product of the curable resin composition for light reflection of the present invention, even when outputting high-intensity light, it can stably emit light for a long period of time. Can be issued. Furthermore, the reflector made of the cured product of the light-reflective curable resin composition of the present invention has excellent adhesion to the sealing resin (especially epoxy resin) of the optical semiconductor element, and has problems such as a decrease in light intensity over time. Hard to occur. For this reason, the optical semiconductor device of this invention can exhibit high reliability as a long-life optical semiconductor device.
- the average particle size and the maximum particle size of the rubber particles are determined based on a nanotrac TM particle size distribution measuring device (trade name “UPA-EX150”, manufactured by Nikkiso Co., Ltd.) using the dynamic light scattering method as a measurement principle. ) Is used to measure the following sample, and in the obtained particle size distribution curve, the average particle size, which is the particle size when the cumulative curve becomes 50%, is the average particle size, and the frequency (%) of the particle size distribution measurement result is The maximum particle size at the time when it exceeded 0.00% was defined as the maximum particle size.
- sample A sample obtained by dispersing 1 part by weight of a rubber particle-dispersed epoxy compound obtained in Production Example 2 below in 20 parts by weight of tetrahydrofuran was used as a sample.
- the viscosity at 25 ° C. of the rubber particle-dispersed epoxy compound (5 parts by weight of rubber particles dispersed in 100 parts by weight of Celoxide 2021P (manufactured by Daicel Chemical Industries)) obtained in Production Example 2 is a digital viscometer. (Trade name “DVU-EII type”, manufactured by Tokimec Co., Ltd.).
- Production Example 1 [Production of rubber particles] A 1 L polymerization vessel equipped with a reflux condenser was charged with 500 g of ion-exchanged water and 1.3 g of sodium dioctyl succinate and heated to 80 ° C. while stirring under a nitrogen stream. Here, a monomer mixture consisting of 9.5 g of butyl acrylate, 2.57 g of styrene, and 0.39 g of divinylbenzene corresponding to about 5% by weight of the amount required to form the core portion is collectively collected.
- the obtained latex was frozen at minus 30 ° C., dehydrated and washed with a suction filter, and then blown and dried at 60 ° C. overnight to obtain rubber particles.
- the resulting rubber particles had an average particle size of 108 nm and a maximum particle size of 289 nm.
- Production Example 2 [Production of rubber particle-dispersed epoxy compound] Using a dissolver (1000 rpm, 60 minutes) in a state heated to 60 ° C. under a nitrogen stream, 5 parts by weight of the rubber particles obtained in Production Example 1 were added to the product name “Celoxide 2021P” (Daicel Chemical Industries, Ltd.). ) Produced) dispersed in 100 parts by weight and vacuum degassed to obtain a rubber particle-dispersed epoxy compound (viscosity at 25 ° C .: 1036 mPa ⁇ s).
- the obtained kneaded product was mixed with a curing agent, a curing accelerator, and an additive with a self-revolving stirrer (trade name “Awatori Nerita AR- 250 ", manufactured by Shinky Co., Ltd.) and uniformly mixed (2000 rpm, 5 minutes) and defoamed to obtain a curable resin composition (curable epoxy resin composition).
- “-” means that the component was not blended.
- the curable resin composition was poured into a mold, placed in an oven (trade name “GPHH-201”, manufactured by ESPEC Corporation), and heated at 120 ° C. for 7 hours to obtain a cured product. According to the following procedure, the reflectance and storage elastic modulus of the cured product were measured, and the presence or absence of cracks during molding (cutting) and the presence or absence of cracks during reflow were evaluated. The evaluation results are shown in Table 1.
- CEL2021P trade name “Celoxide 2021P” (3,4-epoxycyclohexylmethyl (3,4-epoxy) cyclohexanecarboxylate), manufactured by Daicel Chemical Industries, Ltd.
- EHPE3150 trade name “EHPE3150” (2,2-bis (Hydroxymethyl) -1-butanol 1,2-epoxy-4- (2-oxiranyl) cyclohexane adduct), manufactured by Daicel Chemical Industries, Ltd.
- U-CAT SA506 Trade name “U-CAT SA506” (1,8-diazabicyclo (5.4.0) ) Undecene-7-p-toluenesulfonate), manufactured by San Apro Co., Ltd.
- SI-100L Trade name “Sun-Aid SI-100L” (arylsulfonium salt), manufactured by Sanshin Chemical Industry Co., Ltd.
- Ethylene glycol Wako Pure Chemical Industries, Ltd.
- White pigment Trade name “TCR-52” ( Titanium oxide), manufactured by Sakai Chemical Industry Co., Ltd.
- the cured product of the light-reflective curable resin composition of the present invention had excellent light reflectivity, and was tough without cracks during cutting and reflow. . Furthermore, even after heat aging and ultraviolet aging, high light reflectivity was maintained, and heat resistance and light resistance were excellent.
- the curable resin composition for light reflection of this invention was excellent in the dispersion stability of a white pigment. On the other hand, when it did not have rubber particles (comparative example), cracks occurred during cutting and the toughness was poor. In addition, the curable resin composition of the comparative example had poor dispersion stability of the white pigment.
- the light-reflective curable resin composition of the present invention can be preferably used in various fields including applications such as optical semiconductor-related electrical / electronic sealing materials.
- the obtained optical semiconductor device can continue to exhibit excellent performance for a long period of time, and can obtain high reliability as a long-life optical semiconductor device. .
- Reflector (a reflector made of a cured product of the curable resin composition for light reflection of the present invention) 2: Metal wiring 3: Optical semiconductor element 4: Bonding wire 5: Sealing resin 6: Package resin
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Abstract
Description
また、本発明の目的は、経時で光の輝度が低下しにくく、信頼性の高い光半導体装置を提供することにある。
本発明の光反射用硬化性樹脂組成物は、脂環式エポキシ化合物(A)、ゴム粒子(B)、白色顔料(C)、硬化剤(D)、及び硬化促進剤(E)を必須成分として含む硬化性樹脂組成物、又は、脂環式エポキシ化合物(A)、ゴム粒子(B)、白色顔料(C)、及び硬化触媒(F)を必須成分として含む硬化性樹脂組成物である。
本発明の光反射用硬化性樹脂組成物の必須成分である脂環式エポキシ化合物(脂環式エポキシ樹脂)(A)は、脂環を構成する隣接する2つの炭素原子と酸素原子とで構成されるエポキシ基を有する脂環式化合物であり、周知慣用のものの中から任意に選択して使用することができる。上記脂環式エポキシ化合物は、調合時、及び注型時などの作業性の点から、常温(25℃)で液状を呈するものが好ましい。
本発明の光反射用硬化性樹脂組成物の必須成分であるゴム粒子(B)は、ゴム弾性を有する粒子である。ゴム粒子(B)は、特に限定されないが、耐熱性及び耐光性の点で、(メタ)アクリル酸エステルを必須のモノマー成分とするポリマー(アクリル系ポリマー)で構成されたゴム粒子であることが好ましい。さらに、ゴム粒子(B)は、分散性が良好であり靭性向上(耐クラック性向上)の効果を得られやすい点で、ゴム弾性を有するコア部分と、該コア部分を被覆する少なくとも1層のシェル層とからなる多層構造(コアシェル構造)を有するゴム粒子(コアシェル型ゴム粒子)であることが好ましい。なお、これらのゴム粒子は単独で、又は2種以上を組み合わせて使用することができる。
本発明の光反射用硬化性樹脂組成物の必須成分である白色顔料(C)は、上記硬化性樹脂組成物を硬化して得られる硬化物に対し、高い光反射性を発揮させる役割を担う。白色顔料(C)としては、公知乃至慣用の白色顔料を使用することができ、特に限定されないが、例えば、ガラス、クレー、雲母、タルク、カオリナイト(カオリン)、ハロイサイト、ゼオライト、酸性白土、活性白土、ベーマイト、擬ベーマイト、無機酸化物、アルカリ土類金属塩等の金属塩などの無機白色顔料;スチレン系樹脂、ベンゾグアナミン系樹脂、尿素-ホルマリン系樹脂、メラミン-ホルマリン系樹脂、アミド系樹脂等の樹脂顔料などの有機白色顔料(プラスチックピグメントなど);中空構造(バルーン構造)を有する中空粒子などが挙げられる。これらの白色顔料は単独で、又は2種以上を組み合わせて使用することができる。
本発明の光反射用硬化性樹脂組成物において硬化剤(D)は、エポキシ基を有する化合物を硬化させる働きを有する。硬化剤(D)としては、特に限定されず、エポキシ樹脂用硬化剤として周知慣用の硬化剤を使用することができる。中でも、硬化剤(D)としては、25℃で液状の酸無水物が好ましく、例えば、メチルテトラヒドロ無水フタル酸、メチルヘキサヒドロ無水フタル酸、ドデセニル無水コハク酸、メチルエンドメチレンテトラヒドロ無水フタル酸などが挙げられる。また、常温(25℃)で固体状の酸無水物(例えば、無水フタル酸、テトラヒドロ無水フタル酸、ヘキサヒドロ無水フタル酸、メチルシクロヘキセンジカルボン酸無水物など)は、常温(25℃)で液状の酸無水物に溶解させて液状の混合物とすることで、硬化剤(D)として使用することもできる。これらの硬化剤は単独で、又は2種以上を組み合わせて使用することができる。
本発明の光反射用硬化性樹脂組成物において硬化促進剤(E)は、エポキシ基を有する化合物が硬化剤(D)により硬化する際の硬化速度を促進する機能を有する化合物である。硬化促進剤(E)としては、周知慣用の硬化促進剤を使用することができ、特に限定されないが、例えば、1,8-ジアザビシクロ[5.4.0]ウンデセン-7(DBU)、及びその塩(例えば、フェノール塩、オクチル酸塩、p-トルエンスルホン酸塩、ギ酸塩、テトラフェニルボレート塩);1,5-ジアザビシクロ[4.3.0]ノネン-5(DBN)、及びその塩(例えば、ホスホニウム塩、スルホニウム塩、4級アンモニウム塩、ヨードニウム塩);ベンジルジメチルアミン、2,4,6-トリス(ジメチルアミノメチル)フェノール、N,N-ジメチルシクロヘキシルアミンなどの3級アミン;2-エチル-4-メチルイミダゾール、1-シアノエチル-2-エチル-4-メチルイミダゾールなどのイミダゾール類;リン酸エステル、トリフェニルホスフィンなどのホスフィン類;テトラフェニルホスホニウムテトラ(p-トリル)ボレートなどのホスホニウム化合物;オクチル酸スズ、オクチル酸亜鉛などの有機金属塩;金属キレートなどが挙げられる。これらの硬化促進剤は単独で、又は2種以上を組み合わせて使用することができる。
本発明の光反射用硬化性樹脂組成物において硬化触媒(F)は、光反射用硬化性樹脂組成物中のエポキシ化合物の重合を開始させる働きを有する。硬化触媒(F)としては、紫外線照射又は加熱処理を施すことによりカチオン種を発生して、エポキシ化合物(特に、脂環式エポキシ化合物(A))の重合を開始させるカチオン重合開始剤が好ましい。
上記芳香環を有しないグリシジルエーテル系エポキシ化合物には、脂肪族グリシジルエーテル系エポキシ化合物、及び、芳香族グリシジルエーテル系エポキシ化合物を核水添した化合物が含まれる。上記芳香環を有しないグリシジルエーテル系エポキシ化合物としては、例えば、商品名「EPICLON703」、「EPICLON707」、「EPICLON720」、「EPICLON725」(以上、DIC(株)製)、商品名「YH-300」、「YH-315」、「YH-324」、「PG-202」、「PG-207」、「サントートST-3000」(以上、東都化成(株)製)、商品名「リカレジンDME-100」、「リカレジンHBE-100」(以上、新日本理化(株)製)、商品名「デナコールEX-212」、「デナコールEX-321」(以上、ナガセケムテックス(株)製)、商品名「YX8000」、「YX8034」(以上、ジャパンエポキシレジン(株)製)等の市販品を好ましく使用することができる。
上記25℃で液状を呈するポリオール化合物には、ポリエーテルポリオール以外のポリオール化合物が含まれ、例えば、ポリエステルポリオール、ポリカーボネートポリオール等が含まれる。
本発明の光半導体装置は、光源としての光半導体素子と、本発明の光反射用硬化性樹脂組成物の硬化物からなるリフレクター(反射材)とを少なくとも備える光半導体装置である。なお、リフレクターとは、光半導体装置において光半導体素子から発せられた光を反射させて、光の指向性及び輝度を高め、光の取り出し効率を向上させるための部材である。図1は、本発明の光反射用硬化性樹脂組成物の硬化物より形成されたリフレクターを有する光半導体装置(本発明の光半導体装置)の一例を示す概略図であり、(a)は斜視図、(b)は断面図を表す。図1における1はリフレクター、2は金属配線、3は光半導体素子(LED素子)、4はボンディングワイヤ、5は封止樹脂、6はパッケージ樹脂を示す。上記リフレクター1は、封止樹脂5の周囲を環状に取り囲み、上方に向かってその環の径が拡大するように傾斜した形状を有している。図1に示す光半導体装置においては、LED素子3から発せられた光をリフレクター1の表面(反射面)で反射することによって、高い効率で光半導体素子3からの光を取り出すことができる。
試料:
下記製造例2で得られたゴム粒子分散エポキシ化合物1重量部をテトラヒドロフラン20重量部に分散させたものを試料とした。
還流冷却器付きの1L重合容器に、イオン交換水500g、及びジオクチルコハク酸ナトリウム1.3gを仕込み、窒素気流下に撹拌しながら、80℃に昇温した。ここに、コア部分を形成するために必要とする量の約5重量%分に該当するアクリル酸ブチル9.5g、スチレン2.57g、及びジビニルベンゼン0.39gからなる単量体混合物を、一括添加し、20分間撹拌して乳化させた後、ペルオキソ二硫酸カリウム12mgを添加し、1時間撹拌して最初のシード重合を行い、続いて、ペルオキソ二硫酸カリウム228mgを添加し、5分間撹拌した。ここに、コア部分を形成するために必要とする量の残り(約95重量%分)のアクリル酸ブチル180.5g、スチレン48.89g、ジビニルベンゼン7.33gにジオクチルコハク酸ナトリウム1.2gを溶解させてなる単量体混合物を2時間かけて連続的に添加し、2度目のシード重合を行い、その後、1時間熟成してコア部分を得た。
次いで、ペルオキソ二硫酸カリウム60mgを添加して5分間撹拌し、これに、メタクリル酸メチル60g、アクリル酸2.0g、及びアリルメタクリレート0.3gにジオクチルコハク酸ナトリウム0.3gを溶解させてなる単量体混合物を30分かけて連続的に添加し、シード重合を行った。その後、1時間熟成し、コア部分を被覆するシェル層を形成した。
次いで、室温(25℃)まで冷却し、目開き120μmのプラスチック製網で濾過することにより、コアシェル構造を有する粒子を含むラテックスを得た。得られたラテックスをマイナス30℃で凍結し、吸引濾過器で脱水洗浄した後、60℃で一昼夜送風乾燥してゴム粒子を得た。得られたゴム粒子の平均粒子径は108nm、最大粒子径は289nmであった。
窒素気流下、60℃に加温した状態でディゾルバー(1000rpm、60分間)を使用して、製造例1で得られたゴム粒子5重量部を、商品名「セロキサイド2021P」(ダイセル化学工業(株)製)100重量部に分散させ、真空脱泡して、ゴム粒子分散エポキシ化合物(25℃での粘度:1036mPa・s)を得た。
[硬化性樹脂組成物の調製]
表1に示す配合処方(単位:重量部)に従って、ゴム粒子分散エポキシ化合物(実施例1~5の場合)、エポキシ化合物(実施例2~5、比較例1~3の場合)、及び白色顔料(酸化チタン;商品名「TCR-52」、堺化学工業(株)製)を、ディゾルバーを使用して均一に混合し、ロールミルによって所定条件下(ロールピッチ:0.2mm、回転数:25ヘルツ、3パス)で溶融混練して混練物を得た。さらに、得られた混練物に対し、表1に示す配合処方(単位:重量部)に従って、硬化剤、硬化促進剤、及び添加剤を自公転式撹拌装置(商品名「あわとり練太郎AR-250」、シンキー(株)製)を使用して均一に混合し(2000rpm、5分間)、脱泡して、硬化性樹脂組成物(硬化性エポキシ樹脂組成物)を得た。なお、表1における「-」は、当該成分の配合を行わなかったことを意味する。
[硬化性樹脂組成物の硬化物の評価]
上記硬化性樹脂組成物を金型に注型し、オーブン(商品名「GPHH-201」、エスペック(株)製)に入れて、120℃で7時間加熱することによって、硬化物を得た。下記の手順に従って、上記硬化物の反射率及び貯蔵弾性率を測定し、成形(切削加工)時のクラック有無及びリフロー時のクラック有無の評価を行った。評価結果を表1に示す。
[硬化性樹脂組成物の調製]
表1に示す配合処方(単位:重量部)に従って、ゴム粒子分散エポキシ化合物(実施例6,7の場合)、エポキシ化合物(実施例7、比較例4,5の場合)、白色顔料(酸化チタン;商品名「TCR-52」、堺化学工業(株)製)、硬化触媒を、ディゾルバーを使用して均一に混合し、ロールミルによって所定条件下(ロールピッチ:0.2mm、回転数:25ヘルツ、3パス)で溶融混練して、最後に自公転式攪拌装置(商品名「あわとり練太郎AR-250」、シンキー(株)製)を使用して脱泡して、硬化性樹脂組成物(硬化性エポキシ樹脂組成物)を得た。なお、表1における「-」は、当該成分の配合を行わなかったことを意味する。
[硬化性樹脂組成物の硬化物の評価]
上記硬化性樹脂組成物を金型に注型し、オーブン(商品名「GPHH-201」、エスペック(株)製)に入れて、65℃で2時間加熱し、さらに150℃に昇温して1時間加熱することによって、硬化物を得た。下記の手順に従って、上記硬化物の反射率及び貯蔵弾性率を測定し、成形(切削加工)時のクラック有無及びリフロー時のクラック有無の評価を行った。評価結果を表1に示す。
実施例及び比較例で得られた硬化物を切削加工して、厚み3mmの試験片を作製した。次いで、分光光度計(商品名「分光光度計 UV-2450」、(株)島津製作所製)を用いて、波長450nmの光に対する各試験片の反射率(「初期反射率」とする)を測定した。
初期反射率を測定した試験片(厚み3mm)を、120℃で250時間加熱した後、波長450nmの光に対する反射率(「加熱エージング後の反射率」とする)を測定した。そして、下記式により、反射率保持率(加熱エージング前後)を算出した。
[反射率保持率(加熱エージング前後)]=([加熱エージング後の反射率]/[初期反射率])×100
初期反射率を測定した試験片(厚み3mm)に対し、強度10mW/cm2の紫外線を250時間照射した後、波長450nmの光に対する反射率(「紫外線エージング後の反射率」とする)を測定した。そして、下記式により、反射率保持率(紫外線エージング前後)を算出した。
[反射率保持率(紫外線エージング前後)]=([紫外線エージング後の反射率]/[初期反射率])×100
実施例及び比較例で得られた硬化物を切削加工して、幅5mm×長さ40mm×厚み1mmの試験片を作製した。次いで、動的粘弾性測定装置(商品名「DMS6100」、セイコーインスツル(株)製)を用いて、25℃における貯蔵弾性率、及び260℃における貯蔵弾性率を測定した。
実施例及び比較例で得られた硬化物を切削加工して、幅5mm×長さ5mm×厚さ3mmの試験片を作製した。上記硬化物の切削加工には、マイクロ・カッティング・マシン(商品名「BS-300CL」、メイワフォーシス(株)製)を使用し、切削加工の際に硬化物にクラックが生じたか否かを、デジタルマイクロスコープ(商品名「VHX-900」、(株)キーエンス製)を用いて観察し、確認した。表1には、1サンプルにつき10個の試験片を作製し、そのうちクラックの発生が確認された試験片の個数[個/10個]を評価結果として示す。
上記切削加工により得られた試験片(幅5mm×長さ5mm×厚さ3mm)に対し、リフロー炉(商品名「UNI-5016F」、日本アントム(株)製)を用いて、260℃を最高温度として5秒間、全リフロー時間を90秒としてリフロー処理を施した。その後、当該リフロー処理により試験片にクラックが生じたか否かを、デジタルマイクロスコープ(商品名「VHX-900」、(株)キーエンス製)を用いて観察し、確認した。表1には、1サンプルにつき10個の試験片のリフロー処理を行い、そのうちクラックの発生が確認された試験片の個数[個/10個]を評価結果として示す。
実施例及び比較例で得られた硬化性樹脂組成物(硬化性エポキシ樹脂組成物)中の白色顔料の分散安定性の指標として、エポキシ化合物(エポキシ樹脂)中に白色顔料及びゴム粒子を分散させた分散液(比較例の場合は、エポキシ化合物中に白色顔料を分散させた分散液)を常温下で30日間静置した場合の、該分散液中の白色顔料の沈降の有無を確認した。具体的には、以下の手順で評価を実施した。
表1に示す配合処方(単位:重量部)に従って、硬化剤、添加剤、硬化促進剤、及び硬化触媒を除く成分(ゴム粒子分散エポキシ化合物、エポキシ化合物、白色顔料)を、ディゾルバーを使用して均一に混合し、ロールミルによって所定条件下(ロールピッチ:0.2mm、回転数:25ヘルツ、3パス)で溶融混練して、最後に自公転式攪拌装置(商品名「あわとり練太郎AR-250」、シンキー(株)製)を使用して脱泡し、分散液を得た。この分散液を透明なガラス容器に入れ、常温下で放置し、30日後における白色顔料の分散安定性を目視で評価した。即ち、分散液中で白色顔料が沈降していた場合を分散安定性不良(沈降有り)、白色顔料が沈降していない場合を分散安定性良好(沈降無し)と評価し、表1に結果を示した。
・CEL2021P:商品名「セロキサイド2021P」(3,4-エポキシシクロヘキシルメチル(3,4-エポキシ)シクロヘキサンカルボキシレート)、ダイセル化学工業(株)製
・EHPE3150:商品名「EHPE3150」(2,2-ビス(ヒドロキシメチル)-1-ブタノールの1,2-エポキシ-4-(2-オキシラニル)シクロヘキサン付加物)、ダイセル化学工業(株)製
・MH-700:商品名「リカシッド MH-700」(4-メチルヘキサヒドロ無水フタル酸/ヘキサヒドロ無水フタル酸=70/30)、新日本理化(株)製
・U-CAT SA506:商品名「U-CAT SA506」(1,8-ジアザビシクロ(5.4.0)ウンデセン-7-p-トルエンスルホン酸塩)、サンアプロ(株)製
・サンエイド SI-100L:商品名「サンエイド SI-100L」(アリールスルホニウム塩)、三新化学工業(株)製
・エチレングリコール:和光純薬工業(株)製
・白色顔料:商品名「TCR-52」(酸化チタン)、堺化学工業(株)製
一方、ゴム粒子を有しない場合(比較例)は、切削加工時にクラックが生じ、靭性に劣っていた。なお、比較例の硬化性樹脂組成物は、白色顔料の分散安定性が不良であった。
2: 金属配線
3: 光半導体素子
4: ボンディングワイヤ
5: 封止樹脂
6: パッケージ樹脂
Claims (7)
- 脂環式エポキシ化合物(A)、ゴム粒子(B)、白色顔料(C)、硬化剤(D)、及び硬化促進剤(E)を含むことを特徴とする光反射用硬化性樹脂組成物。
- 脂環式エポキシ化合物(A)、ゴム粒子(B)、白色顔料(C)、及び硬化触媒(F)を含むことを特徴とする光反射用硬化性樹脂組成物。
- 前記ゴム粒子(B)が、(メタ)アクリル酸エステルを必須のモノマー成分とするポリマーで構成され、表面にヒドロキシル基及び/又はカルボキシル基を有し、前記ゴム粒子(B)の平均粒子径が10~500nmであり、最大粒子径が50~1000nmである請求項1又は2に記載の光反射用硬化性樹脂組成物。
- 前記白色顔料(C)が、酸化アルミニウム、酸化マグネシウム、酸化アンチモン、酸化チタン、酸化ジルコニウム、及び無機中空粒子からなる群より選ばれた1種以上である請求項1~3のいずれか1項に記載の光反射用硬化性樹脂組成物。
- 前記白色顔料(C)の中心粒径が0.1~50μmである請求項1~4のいずれか1項に記載の光反射用硬化性樹脂組成物。
- LEDパッケージ用硬化性樹脂組成物である請求項1~5のいずれか1項に記載の光反射用硬化性樹脂組成物。
- 光半導体素子と、請求項6に記載の光反射用硬化性樹脂組成物の硬化物からなるリフレクターとを少なくとも備えることを特徴とする光半導体装置。
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US14/006,629 US9184355B2 (en) | 2011-06-27 | 2012-06-18 | Curable resin composition for reflection of light, and optical semiconductor device |
EP12804350.2A EP2725060A4 (en) | 2011-06-27 | 2012-06-18 | HARDENABLE RESIN COMPOSITION FOR REFLECTING LIGHT AND OPTICAL SEMICONDUCTOR DEVICE |
JP2013522758A JP5945537B2 (ja) | 2011-06-27 | 2012-06-18 | 光反射用硬化性樹脂組成物及び光半導体装置 |
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JP2013213117A (ja) * | 2012-03-30 | 2013-10-17 | Idemitsu Kosan Co Ltd | 樹脂組成物並びにそれを用いた光半導体用封止材及び光半導体用反射材 |
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JP2020200396A (ja) * | 2019-06-10 | 2020-12-17 | パナソニックIpマネジメント株式会社 | 紫外線硬化性樹脂組成物、発光装置の製造方法及び発光装置 |
JPWO2023008422A1 (ja) * | 2021-07-26 | 2023-02-02 | ||
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Also Published As
Publication number | Publication date |
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CN103492482B (zh) | 2016-11-09 |
EP2725060A1 (en) | 2014-04-30 |
KR20140027111A (ko) | 2014-03-06 |
US20140008686A1 (en) | 2014-01-09 |
US9184355B2 (en) | 2015-11-10 |
JPWO2013002052A1 (ja) | 2015-02-23 |
TWI575015B (zh) | 2017-03-21 |
JP5945537B2 (ja) | 2016-07-05 |
CN103492482A (zh) | 2014-01-01 |
TW201305270A (zh) | 2013-02-01 |
EP2725060A4 (en) | 2015-04-15 |
KR101905216B1 (ko) | 2018-10-05 |
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