WO2012015011A1 - 多価カルボン酸縮合体、熱硬化性樹脂組成物、光半導体素子搭載用基板及びその製造方法、並びに光半導体装置 - Google Patents
多価カルボン酸縮合体、熱硬化性樹脂組成物、光半導体素子搭載用基板及びその製造方法、並びに光半導体装置 Download PDFInfo
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- WO2012015011A1 WO2012015011A1 PCT/JP2011/067365 JP2011067365W WO2012015011A1 WO 2012015011 A1 WO2012015011 A1 WO 2012015011A1 JP 2011067365 W JP2011067365 W JP 2011067365W WO 2012015011 A1 WO2012015011 A1 WO 2012015011A1
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- resin composition
- thermosetting resin
- optical semiconductor
- semiconductor element
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- 239000011342 resin composition Substances 0.000 title claims description 101
- 229920001187 thermosetting polymer Polymers 0.000 title claims description 98
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- 239000002253 acid Substances 0.000 title abstract description 13
- 238000000034 method Methods 0.000 title description 39
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- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
- 230000003287 optical effect Effects 0.000 claims description 99
- 239000003795 chemical substances by application Substances 0.000 claims description 69
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- 229920005989 resin Polymers 0.000 claims description 62
- 239000011347 resin Substances 0.000 claims description 62
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- 239000003822 epoxy resin Substances 0.000 claims description 52
- 125000001183 hydrocarbyl group Chemical group 0.000 claims description 21
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- 239000000126 substance Substances 0.000 claims description 12
- ARCGXLSVLAOJQL-UHFFFAOYSA-N trimellitic acid Chemical compound OC(=O)C1=CC=C(C(O)=O)C(C(O)=O)=C1 ARCGXLSVLAOJQL-UHFFFAOYSA-N 0.000 claims description 12
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- XNGIFLGASWRNHJ-UHFFFAOYSA-N phthalic acid Chemical compound OC(=O)C1=CC=CC=C1C(O)=O XNGIFLGASWRNHJ-UHFFFAOYSA-N 0.000 claims description 10
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- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 claims description 8
- 125000005843 halogen group Chemical group 0.000 claims description 8
- CYIDZMCFTVVTJO-UHFFFAOYSA-N pyromellitic acid Chemical compound OC(=O)C1=CC(C(O)=O)=C(C(O)=O)C=C1C(O)=O CYIDZMCFTVVTJO-UHFFFAOYSA-N 0.000 claims description 7
- NAWXUBYGYWOOIX-SFHVURJKSA-N (2s)-2-[[4-[2-(2,4-diaminoquinazolin-6-yl)ethyl]benzoyl]amino]-4-methylidenepentanedioic acid Chemical compound C1=CC2=NC(N)=NC(N)=C2C=C1CCC1=CC=C(C(=O)N[C@@H](CC(=C)C(O)=O)C(O)=O)C=C1 NAWXUBYGYWOOIX-SFHVURJKSA-N 0.000 claims description 6
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- 229910000410 antimony oxide Inorganic materials 0.000 claims description 5
- 125000004432 carbon atom Chemical group C* 0.000 claims description 5
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- 125000000962 organic group Chemical group 0.000 claims description 5
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- SRPWOOOHEPICQU-UHFFFAOYSA-N trimellitic anhydride Chemical compound OC(=O)C1=CC=C2C(=O)OC(=O)C2=C1 SRPWOOOHEPICQU-UHFFFAOYSA-N 0.000 description 5
- KMOUUZVZFBCRAM-OLQVQODUSA-N (3as,7ar)-3a,4,7,7a-tetrahydro-2-benzofuran-1,3-dione Chemical compound C1C=CC[C@@H]2C(=O)OC(=O)[C@@H]21 KMOUUZVZFBCRAM-OLQVQODUSA-N 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
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- 239000004593 Epoxy Substances 0.000 description 4
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Images
Classifications
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- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
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- C08G59/4246—Polycarboxylic acids; Anhydrides, halides or low molecular weight esters thereof polymers with carboxylic terminal groups
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G67/00—Macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing oxygen or oxygen and carbon, not provided for in groups C08G2/00 - C08G65/00
- C08G67/04—Polyanhydrides
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- H01L33/60—Reflective elements
Definitions
- the present invention relates to a polyvalent carboxylic acid condensate, a thermosetting resin composition, a substrate for mounting an optical semiconductor element, a manufacturing method thereof, and an optical semiconductor device.
- Optical semiconductor devices combining optical semiconductor elements such as LEDs (Light Emitting Diodes) and phosphors with high energy efficiency and long service life are used for outdoor displays, portable LCD backlights, and in-vehicle applications.
- LEDs Light Emitting Diodes
- phosphors with high energy efficiency and long service life are used for outdoor displays, portable LCD backlights, and in-vehicle applications.
- the demand is expanding.
- the brightness of LED devices is increasing, and it is required to prevent an increase in junction temperature due to an increase in the amount of heat generated by the element and deterioration of the optical semiconductor device due to a direct increase in light energy.
- Patent Document 1 discloses a substrate for mounting an optical semiconductor element using a thermosetting resin composition composed of an epoxy resin and a curing agent such as an acid anhydride.
- thermosetting resin composition when a conventional thermosetting resin composition is used to produce a substrate for mounting an optical semiconductor by transfer molding, the resin composition oozes into the gap between the upper mold and the lower mold of the molding die during molding. There is a tendency for contamination to occur. If resin stains occur during heat molding, the resin stains over the opening (concave portion) of the substrate, which becomes the optical semiconductor element mounting region, which becomes an obstacle when mounting the optical semiconductor element. Further, even if the optical semiconductor element can be mounted in the opening, the resin stain may cause a failure such as a connection failure when the optical semiconductor element and the metal wiring are electrically connected by a bonding wire or the like.
- a resin stain removal step is added to the manufacturing process of the substrate for mounting an optical semiconductor element.
- the removal step there is a method of performing electrolytic degreasing treatment and immersion degreasing treatment step, and then removing dirt components by high pressure water washing, media blasting, air gun or the like.
- Such a process is called a deflash process.
- a method of exposing the substrate to a strong alkaline chemical solution is usually used in order to remove resin stains.
- the resin component may be eluted from portions other than the resin stain, that is, the molded cured product, and the appearance of the product may be impaired. Therefore, the improvement of the alkali tolerance of the hardened
- the present invention has been made in view of the above circumstances.
- the present invention is capable of providing a cured product having excellent alkali resistance and sufficiently reduced elution of resin components.
- An object is to provide a polyvalent carboxylic acid condensate.
- the present invention provides a thermosetting resin composition capable of forming a cured product that is sufficiently excellent in moldability, excellent in alkali resistance, and sufficiently reduced in elution of a resin component, and an optical semiconductor element mounting substrate using the same It is another object of the present invention to provide an optical semiconductor device.
- the present invention relates to a polyvalent carboxylic acid condensate obtained by condensing a carboxyl group-containing compound between molecules, and having a constitutional unit derived from a carboxyl group-containing compound having a solubility in water of 100 g / L or less at 30 ° C. It relates to a carboxylic acid condensate.
- Such polyhydric carboxylic acid anhydrides when used as a curing agent for epoxy resins, can form a cured product having excellent alkali resistance and sufficiently reduced elution of resin components.
- the alkali resistance is further improved.
- the structural unit derived from the carboxyl group-containing compound is a structural unit derived from at least one carboxyl group-containing compound selected from the group consisting of trimellitic acid, tetrahydrophthalic acid, phthalic acid, pyromellitic acid, fumaric acid and benzoic acid. It is preferable that
- the polyvalent carboxylic acid condensate of the present invention contains a component represented by the following general formula (1), the polyvalent carboxylic acid condensate is further excellent in alkali resistance and is suitable as a curing agent for epoxy resins.
- R x represents a divalent organic group, a plurality of R x in the same molecule may be the same or different, and n represents an integer of 0 or more.
- R x is preferably a divalent group which has an aliphatic hydrocarbon ring and the aliphatic hydrocarbon ring may be substituted with a halogen atom or a linear or branched hydrocarbon group.
- R x is preferably a divalent group represented by the following general formula (10).
- m represents an integer of 0 to 4
- R z represents a halogen atom or a linear or branched hydrocarbon group having 1 to 4 carbon atoms, and a plurality of m when m is 2 to 4.
- R z may be the same or different, and may be linked to each other to form a ring.
- the present invention is a thermosetting resin composition containing (A) an epoxy resin and (B) a curing agent, wherein (B) the curing agent contains the polyvalent carboxylic acid condensate described above. Related to things.
- curing agent can further contain the compound represented by following formula (2).
- curing agent can further contain the compound represented by following formula (3).
- the blending amount of the polyvalent carboxylic acid condensate is preferably 10 to 150 parts by mass with respect to 100 parts by mass of the (A) epoxy resin.
- thermosetting resin composition containing (A) an epoxy resin and (B) a curing agent, wherein (B) the curing agent is a compound represented by the following general formula (1)
- a thermosetting resin composition comprising at least one acid anhydride selected from the group consisting of a compound represented by the formula (2) and a compound represented by the following formula (3).
- R x represents a divalent organic group, a plurality of R x in the same molecule may be the same or different, and n represents an integer of 0 or more.
- thermosetting resin composition of the present invention further contains (D) a white pigment since the light reflectance in the visible light to near ultraviolet light region can be increased after curing.
- the white pigment can contain at least one inorganic substance selected from the group consisting of alumina, magnesium oxide, antimony oxide, titanium oxide, zirconium oxide and inorganic hollow particles.
- the present invention also has a recess composed of a bottom surface and a wall surface, the bottom surface of the recess is an optical semiconductor element mounting portion, and at least a part of the wall surface of the recess is made of a cured product of the thermosetting resin composition of the present invention.
- An optical semiconductor element mounting substrate is provided.
- the present invention further relates to a method for manufacturing a substrate for mounting an optical semiconductor element having a recess composed of a bottom surface and a wall surface, wherein at least a part of the wall surface of the recess is formed using the thermosetting resin composition of the present invention.
- substrate for optical semiconductor element mounting provided with the process to perform is provided.
- the present invention includes a substrate for mounting an optical semiconductor element having a recess composed of a bottom surface and a wall surface, an optical semiconductor element provided in the recess of the substrate for mounting an optical semiconductor element, and sealing the optical semiconductor element by filling the recess.
- an optical semiconductor device including a sealing resin portion to be stopped, and at least a part of the wall surface of the recess is made of a cured product of the thermosetting resin composition of the present invention.
- the polyvalent carboxylic acid condensate of the present invention when used as a curing agent for an epoxy resin, it can give a cured product having excellent alkali resistance and sufficiently reduced elution of resin components. Further, according to the present invention, a thermosetting resin composition capable of forming a cured product that is sufficiently excellent in moldability, excellent in alkali resistance, and sufficiently reduced in elution of a resin component, and mounted on an optical semiconductor element using the same Substrate, a manufacturing method thereof, and an optical semiconductor device can be provided.
- FIG. 1 is a schematic cross-sectional view showing an embodiment of an optical semiconductor device of the present invention.
- 1 is a schematic cross-sectional view showing an embodiment of an optical semiconductor device of the present invention.
- 1 is a schematic cross-sectional view showing an embodiment of an optical semiconductor device of the present invention.
- 1 is a schematic cross-sectional view showing an embodiment of an optical semiconductor device of the present invention.
- polyvalent carboxylic acid condensate means a polymer formed by condensation of one or more polycarboxylic acids having two or more carboxyl groups between molecules. More specifically, the polyvalent carboxylic acid condensate has an acid anhydride group (an acid anhydride bond) formed by dehydration condensation between carboxy groups of two or more monomers having two or more carboxy groups. ) And each monomer unit is linked in a chain or cyclic manner by the generated acid anhydride group.
- an acid anhydride compound that can be obtained by dehydrating and condensing a carboxyl group of a polyvalent carboxylic acid in a molecule means that a carboxyl group of a polyvalent carboxylic acid having two or more carboxyl groups is dehydrated and condensed in the molecule. It means an acid anhydride compound in which an acid anhydride group is generated and a cyclic structure including the generated acid anhydride group is formed.
- the polyvalent carboxylic acid condensate of the present invention is a polyvalent carboxylic acid condensate obtained by condensing a carboxyl group-containing compound between molecules, and has a solubility in water of 100 g / L or less at 30 ° C. It has a structural unit.
- the solubility in this specification refers to the weight of the solute per 1 L of distilled water in a saturated aqueous solution obtained by dissolving a carboxyl group-containing compound in distilled water at 30 ° C.
- the carboxyl group-containing compound having a solubility in water (30 ° C.) of 100 g / L or less examples include tetrahydrophthalic acid (5 g / L), trimellitic acid (20 g / L), hexahydrophthalic acid (1.5 g / L), phthalic acid (9 g / L), benzoic acid (4 g / L), and the like. Therefore, the structural unit derived from the carboxyl group-containing compound is derived from at least one carboxyl group-containing compound selected from the group consisting of trimellitic acid, tetrahydrophthalic acid, phthalic acid, pyromellitic acid, fumaric acid and benzoic acid. Are preferred, and more preferably derived from trimellitic acid.
- examples of the carboxyl group-containing compound having a solubility in water (30 ° C.) exceeding 100 g / L include succinic acid (130 g / L), hydrogenated trimellitic acid (300 g / L), and maleic acid (800 g / L). ).
- succinic acid 130 g / L
- hydrogenated trimellitic acid 300 g / L
- maleic acid 800 g / L.
- a polyvalent carboxylic acid condensate obtained by condensing a carboxyl group-containing compound having a solubility in water (30 ° C.) exceeding 100 g / L is added to the thermosetting resin composition as a curing agent, the thermosetting resin composition When the cured product is exposed to a strong alkaline environment, the resin component is eluted and the surface of the cured product tends to be roughened.
- the solubility (30 ° C.) in water of the carboxyl group-containing compound constituting the polyvalent carboxylic acid condensate according to this embodiment is preferably 50 g / L or less, and more preferably 30 g / L or less.
- the polyvalent carboxylic acid condensate according to the present embodiment has a structural unit derived from a carboxyl group-containing compound having a solubility in water (30 ° C.) of 100 g / L or less as an end group, and a curing agent for an epoxy resin.
- a carboxyl group-containing compound having a solubility in water (30 ° C.) of 100 g / L or less as an end group
- a curing agent for an epoxy resin When used as, it is possible to give a cured product that is further excellent in alkali resistance and further reduces the elution of the resin component.
- the polyvalent carboxylic acid condensate according to the present embodiment preferably includes a component represented by the following general formula (1) as a main component.
- R x represents a divalent organic group, and is preferably a divalent saturated hydrocarbon group having a saturated hydrocarbon ring.
- R x is a saturated hydrocarbon group having a saturated hydrocarbon ring
- the polyvalent carboxylic acid condensate can form a transparent cured product of an epoxy resin.
- a plurality of R x in the same molecule may be the same or different.
- the saturated hydrocarbon ring of R x may be substituted with a halogen atom or a linear or branched hydrocarbon group.
- the hydrocarbon group that substitutes the saturated hydrocarbon ring is preferably a saturated hydrocarbon group.
- the saturated hydrocarbon ring may be a single ring or a condensed ring, a polycyclo ring, a spiro ring or a ring assembly composed of two or more rings.
- R x preferably has 3 to 15 carbon atoms.
- N represents an integer of 0 or more, preferably 0 to 200, and more preferably 0 to 100.
- R x is a group derived by removing a carboxyl group from a polyvalent carboxylic acid as a monomer used to obtain the polymer of formula (1).
- the polyvalent carboxylic acid as a monomer preferably has a boiling point higher than the reaction temperature of polycondensation.
- R x represents a hydrogen atom from a cyclic aliphatic hydrocarbon selected from cyclobutane, cyclopentane, cyclohexane, cycloheptane, cyclooctane, norbornene, dicyclopentadiene, adamantane, hydrogenated naphthalene, and hydrogenated biphenyl. It is preferably a divalent group derived by removing. When R x is these groups, the effect of obtaining a cured product that is transparent and less colored by heat is more remarkably exhibited.
- These cyclic saturated hydrocarbons may be substituted with a halogen atom or a linear or branched hydrocarbon group (preferably a saturated hydrocarbon group).
- R x is preferably a group derived by removing a carboxyl group from 1,2-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid or derivatives thereof. That is, R x is preferably a divalent group represented by the following general formula (10).
- m represents an integer of 0 to 4.
- R z represents a halogen atom or a linear or branched hydrocarbon group having 1 to 4 carbon atoms. When m is 2 to 4, a plurality of R z may be the same or different and may be connected to each other to form a ring.
- the weight average molecular weight Mw of the polyvalent carboxylic acid condensate is preferably 200 to 20,000, more preferably 300 to 10,000.
- the weight average molecular weight Mw is less than 200, the viscosity becomes too low and when used as a curing agent for a thermosetting resin composition, it tends to be difficult to suppress the occurrence of resin stains during transfer molding, more than 20000 If it is large, the compatibility with the epoxy resin or the like tends to decrease, and the fluidity during transfer molding of the thermosetting resin composition tends to decrease.
- the weight average molecular weight Mw used in the present invention can be obtained by measuring under the following conditions using a standard polystyrene calibration curve by gel permeation chromatography (GPC).
- GPC conditions Pump: L-6200 type (manufactured by Hitachi, Ltd., trade name)
- Detector L-3300RI type (manufactured by Hitachi, Ltd., trade name)
- Eluent Tetrahydrofuran Measurement temperature: 30 ° C Flow rate: 1.0 mL / min
- the viscosity of the polyvalent carboxylic acid condensate measured by an ICI cone plate viscometer is preferably 10 to 30000 mPa ⁇ s at 150 ° C., more preferably 10 to 10000 mPa ⁇ s.
- an epoxy resin composition containing the polyvalent carboxylic acid condensate tends to be less effective in suppressing the occurrence of resin stains during transfer molding. If it exceeds s, the fluidity of the thermosetting resin composition tends to decrease in the mold during transfer molding.
- the viscosity of the polyvalent carboxylic acid condensate is, for example, Research Equipment (London) LTD. It can be measured using a manufactured ICI cone plate viscometer.
- the softening point of the polyvalent carboxylic acid condensate is preferably 20 to 200 ° C.
- the polyvalent carboxylic acid condensation polymer preferably has a softening point of 30 to 100 ° C., and preferably 30 to 80 ° C. It is more preferable.
- the softening point is less than 20 ° C.
- the handling property, kneading property and dispersibility are lowered during the production of the thermosetting resin composition, and it is difficult to effectively suppress the occurrence of resin stains during transfer molding.
- the softening point exceeds 200 ° C., the curing agent may remain undissolved in the resin composition when heated to 100 to 200 ° C. by transfer molding, and it tends to be difficult to obtain a uniform molded product.
- the softening point of the polycarboxylic acid polycondensation polymer can be set to a desired range by selecting the structure of the main chain and adjusting the weight average molecular weight. Generally, when a long-chain divalent carboxylic acid is used as a monomer, the softening point can be lowered, and when a highly polar structure is introduced, the softening point can be raised. In general, the softening point can be lowered by increasing the weight average molecular weight.
- the ICI cone plate viscosity, the weight average molecular weight and the softening point of the product can be adjusted according to the purpose by the charged composition ratio of the polycarboxylic acid and the monocarboxylic acid before the condensation reaction.
- the ICI cone plate viscosity, weight average molecular weight, and softening point tend to increase.
- the above-mentioned tendency is not necessarily exhibited, and it is necessary to take into account the reaction temperature, the degree of pressure reduction, and the reaction time, which are the conditions for the dehydration condensation reaction.
- the polyvalent carboxylic acid condensate according to this embodiment It can be obtained by a method comprising a step of dehydrating and condensing the carboxyl groups each has between molecules.
- R x has the same meaning as R x in formula (1).
- R y represents a monovalent hydrocarbon group which may be substituted with an acid anhydride group or a carboxylic ester group.
- the dehydrating condensation reaction liquid is, for example, a polyhydric carboxylic acid and a monocarboxylic acid, and a dehydrating agent selected from acetic anhydride or propionic anhydride, acetyl chloride, an aliphatic acid chloride, and an organic base (such as trimethylamine) that dissolve them.
- a dehydrating agent selected from acetic anhydride or propionic anhydride, acetyl chloride, an aliphatic acid chloride, and an organic base (such as trimethylamine) that dissolve them.
- Containing For example, after the reaction solution is refluxed in a nitrogen atmosphere for 5 to 60 minutes, the temperature of the reaction solution is increased to 180 ° C., and the generated acetic acid and water are distilled off in an open system under a nitrogen stream. To advance. When generation of volatile components is no longer observed, polycondensation proceeds in a molten state at a temperature of 180 ° C. for 3 hours, more preferably for 8 hours
- the polycarboxylic acid condensate obtained by such a method is a condensate of two molecules of monocarboxylic acid of formula (6), a condensate of polycarboxylic acid of formula (5) and monocarboxylic acid of formula (6), Unreacted products of polyvalent carboxylic acid and monocarboxylic acid, and by-products such as acid anhydrides formed by condensation reaction of a reaction reagent such as acetic anhydride and propionic anhydride with polyvalent carboxylic acid or monocarboxylic acid May contain objects. These by-products may be removed by purification, or may be used as a curing agent in a mixture.
- thermosetting resin composition contains (A) an epoxy resin and (B) a curing agent.
- Epoxy resin As an epoxy resin, what is generally used with the epoxy resin molding material for electronic component sealing can be used.
- epoxy resins include epoxidized phenol and aldehyde novolak resins such as phenol novolac type epoxy resin and orthocresol novolak type epoxy resin, diglycidyl such as bisphenol A, bisphenol F, bisphenol S and alkyl-substituted bisphenol.
- Glycidylamine type epoxy resin obtained by reaction of polyamine such as ether, diaminodiphenylmethane and isocyanuric acid with epichlorohydrin, linear aliphatic epoxy resin obtained by oxidizing olefin bond with peracid such as peracetic acid, and alicyclic An epoxy resin is mentioned. These can be used alone or in combination of two or more.
- bisphenol A type epoxy resin bisphenol F type epoxy resin, bisphenol S type epoxy resin, diglycidyl isocyanurate, triglycidyl isocyanurate, and 1,2-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid or A dicarboxylic acid diglycidyl ester derived from 1,4-cyclohexanedicarboxylic acid is preferred because of relatively little coloring.
- diglycidyl esters of dicarboxylic acids such as phthalic acid, tetrahydrophthalic acid, hexahydrophthalic acid, methyltetrahydrophthalic acid, nadic acid and methylnadic acid are also suitable.
- examples thereof include glycidyl esters such as nuclear hydrogenated trimellitic acid and nuclear hydrogenated pyromellitic acid having an alicyclic structure in which an aromatic ring is hydrogenated.
- Polyorganosiloxane having an epoxy group produced by heating and hydrolyzing and condensing a silane compound in the presence of an organic solvent, an organic base and water is also included.
- an epoxy resin represented by the following formula (7) which is a copolymer of a glycidyl (meth) acrylate monomer and a polymerizable monomer, can also be used.
- R 1 represents a glycidyl group
- R 2 represents a hydrogen atom or a methyl group
- R 3 represents a hydrogen atom or a saturated or unsaturated monovalent hydrocarbon group having 1 to 6 carbon atoms
- R 4 represents a monovalent saturated hydrocarbon group.
- a and b represent a positive integer.
- the epoxy resin is a cycloaliphatic selected from cyclobutane, cyclopentane, cyclohexane, cycloheptane, cyclooctane, norbornene, dicyclopentadiene, adamantane, hydrogenated naphthalene, and hydrogenated biphenyl.
- An alicyclic epoxy resin having an aliphatic hydrocarbon group derived by removing a hydrogen atom from a hydrocarbon is also preferred.
- the cycloaliphatic hydrocarbon may be substituted with a halogen atom or a linear or branched hydrocarbon group.
- 1,2-epoxy-4- (2-oxiranyl) cyclohexane adduct of 2,2-bis (hydroxymethyl) -1-butanol can be used as an epoxy resin
- a product name “EHPE3150” manufactured by Daicel Chemical Industries, Ltd. is available as a commercial product.
- curing agent which concerns on this embodiment should just contain the above-mentioned polyhydric carboxylic acid condensate. That is, the curing agent is a polyvalent carboxylic acid condensate obtained by condensing a carboxyl group-containing compound between molecules, and has a carboxylic acid-derived structural unit having a solubility in water of 100 g / L or less at 30 ° C. Includes acid condensates. (B) Since the hardening
- the curing agent may further contain an acid anhydride formed by ring-closing condensation of a polyvalent carboxylic acid in the molecule.
- the equivalent ratio of (A) the epoxy group contained in the epoxy resin to the acid anhydride group in the (B) curing agent capable of reacting with the epoxy group is 1: 0.3 to 1: 1.2. It is preferable that Thereby, the resin stain
- a curing agent generally used in an epoxy resin molding material for electronic component sealing may be used in combination with the polyvalent carboxylic acid condensate as the curing agent. It can.
- a curing agent is not particularly limited as long as it reacts with the epoxy resin, but is preferably colorless or light yellow. Examples of such a curing agent include an acid anhydride curing agent, an isocyanuric acid derivative curing agent, and a phenol curing agent.
- Examples of the acid anhydride curing agent include phthalic anhydride, maleic anhydride, trimellitic anhydride, pyromellitic anhydride, hexahydrophthalic anhydride, tetrahydrophthalic anhydride, methyl nadic anhydride, nadic anhydride, glutaric anhydride.
- Examples include acid, dimethyl glutaric anhydride, diethyl glutaric anhydride, succinic anhydride, methyl hexahydrophthalic anhydride, and methyl tetrahydrophthalic anhydride.
- Isocyanuric acid derivatives include 1,3,5-tris (1-carboxymethyl) isocyanurate, 1,3,5-tris (2-carboxyethyl) isocyanurate, 1,3,5-tris (3-carboxypropyl) ) Isocyanurate, 1,3-bis (2-carboxyethyl) isocyanurate.
- phthalic anhydride trimellitic anhydride, hexahydrophthalic anhydride, tetrahydrophthalic anhydride, methylhexahydrophthalic anhydride, methyltetrahydrophthalic anhydride, glutaric anhydride, dimethylglutaric anhydride, anhydrous Diethyl glutaric acid or 1,3,5-tris (3-carboxypropyl) isocyanurate is preferably used.
- curing agent may be used individually by 1 type or in combination of 2 or more types. When these curing agents that can be used in combination are included, the viscosity of the (B) curing agent as a whole can be adjusted by changing the blending ratio with the polyvalent carboxylic acid condensate, which is preferable.
- the curing agent is tetrahydrophthalic anhydride which is a compound represented by the following formula (2) or the following formula ( It may further contain trimellitic anhydride which is a compound represented by 3).
- the above-mentioned curing agent that can be used in combination preferably has a molecular weight of 100 to 400.
- an anhydride obtained by hydrogenating all unsaturated bonds of an aromatic ring is preferable to an acid anhydride having an aromatic ring such as trimellitic anhydride or pyromellitic anhydride.
- an acid anhydride curing agent an acid anhydride generally used as a raw material for the polyimide resin may be used.
- the viscosity of the curing agent measured by an ICI cone plate viscometer is preferably 1.0 to 1000 mPa ⁇ s at 150 ° C., more preferably 10 to 200 mPa.
- the viscosity of the curing agent is, for example, Research Equipment (London) LTD. It can be measured using a manufactured ICI cone plate viscometer.
- a method of adjusting the viscosity of the curing agent a method of adjusting the viscosity of the polyvalent carboxylic acid condensate itself by controlling the average molecular weight of the polyvalent carboxylic acid condensate, or a combination with the polyvalent carboxylic acid condensate can be used.
- curing agent is mentioned.
- the (B) curing agent is at least one selected from the group consisting of the compound represented by the general formula (1), the compound represented by the above formula (2), and the compound represented by the above formula (3). It may be an acid anhydride.
- the curing agent contains at least one of the compounds represented by the above (1) to (3), the thermosetting resin composition of the present invention has excellent moldability and alkali resistance. And a cured product in which elution of the resin component is sufficiently reduced can be formed.
- the blending amount of the (B) curing agent is preferably 10 to 150 parts by mass with respect to 100 parts by mass of the (A) epoxy resin, which suppresses resin stains. From the viewpoint, it is more preferably 50 to 120 parts by mass.
- the curing agent has an active group (an acid anhydride group or a hydroxyl group) in (B) the curing agent capable of reacting with the epoxy group with respect to 1 equivalent of the epoxy group in (A) the epoxy resin.
- the blending is preferably 0.5 to 0.9 equivalent, and more preferably 0.7 to 0.8 equivalent. If the said active group is less than 0.5 equivalent, while the cure rate of a thermosetting resin composition will become slow, the glass transition temperature of the hardened
- the thermosetting resin composition of the present invention can contain (C) a curing accelerator.
- C) a hardening accelerator if it has a catalyst function which accelerates
- the curing accelerator include amine compounds, imidazole compounds, organic phosphorus compounds, alkali metal compounds, alkaline earth metal compounds, and quaternary ammonium salts.
- Examples of the amine compound include 1,8-diaza-bicyclo (5,4,0) undecene-7, triethylenediamine, and tri-2,4,6-dimethylaminomethylphenol.
- Examples of the imidazole compound include 2-ethyl-4-methylimidazole.
- examples of the organic phosphorus compound include triphenylphosphine, tetraphenylphosphonium tetraphenylborate, tetra-n-butylphosphonium-o, o-diethylphosphorodithioate, tetra-n-butylphosphonium-tetrafluoroborate, tetra -N-butylphosphonium-tetraphenylborate. These curing accelerators may be used alone or in combination of two or more.
- the blending amount of the (C) curing accelerator is preferably 0.01 to 8 parts by mass, more preferably 0.1 to 3 parts by mass with respect to 100 parts by mass of the (A) epoxy resin. . If the content of the curing accelerator is less than 0.01 parts by mass, a sufficient curing acceleration effect may not be obtained, and if it exceeds 8 parts by mass, discoloration may be seen in the resulting molded article.
- the thermosetting resin composition of the present invention preferably further contains (D) a white pigment.
- a white pigment a well-known thing can be used and it does not specifically limit.
- the white pigment include alumina, magnesium oxide, antimony oxide, titanium oxide, zirconium oxide, and inorganic hollow particles. These can be used alone or in combination of two or more.
- the inorganic hollow particles include sodium silicate glass, aluminum silicate glass, borosilicate soda glass, and shirasu (white sand).
- the white pigment preferably has a center particle size of 0.1 to 50 ⁇ m.
- the center particle size is less than 0.1 ⁇ m, the particles tend to aggregate and the dispersibility tends to decrease, and if it exceeds 50 ⁇ m, it is difficult to sufficiently obtain the reflection characteristics of the cured product made of the thermosetting resin composition. .
- the blending amount of the white pigment is not particularly limited, but is preferably 10 to 85% by volume, more preferably 20 to 75% by volume with respect to the entire thermosetting resin composition. If the blending amount is less than 10% by volume, the light-reflecting properties of the cured thermosetting resin composition tend not to be sufficiently obtained, and if it exceeds 85% by volume, the moldability of the thermosetting resin composition tends to be low. There is a tendency to decrease.
- thermosetting resin composition contains the inorganic filler mentioned later with (D) white pigment
- the total compounding quantity of (D) white pigment and an inorganic filler is with respect to the whole thermosetting resin composition.
- the content is 10 to 85% by volume, the moldability of the thermosetting resin composition can be further improved.
- thermosetting resin composition preferably contains an inorganic filler in order to adjust moldability.
- inorganic fillers include silica, antimony oxide, titanium oxide, aluminum hydroxide, magnesium hydroxide, barium sulfate, magnesium carbonate, barium carbonate, alumina, mica, beryllia, barium titanate, potassium titanate, strontium titanate, Examples include calcium titanate, aluminum carbonate, aluminum silicate, calcium carbonate, calcium silicate, magnesium silicate, silicon nitride, boron nitride, clay such as calcined clay, talc, aluminum borate, aluminum borate, and silicon carbide.
- the inorganic filler is selected from the group consisting of silica, alumina, magnesium oxide, antimony oxide, titanium oxide, zirconium oxide, aluminum hydroxide, and magnesium hydroxide. A mixture of two or more selected is preferable.
- the average particle size of the inorganic filler is preferably 1 to 100 ⁇ m and more preferably 1 to 40 ⁇ m from the viewpoint of improving packing properties with the white pigment.
- the blending amount of the inorganic filler in the thermosetting resin composition of the present embodiment is preferably 1 to 1000 parts by mass with respect to 100 parts by mass of the total amount of the component (A) and the component (B). More preferably, it is ⁇ 800 parts by mass.
- the thermosetting resin composition has a viewpoint of improving the adhesion between the components (A) to (C), which are thermosetting resin components, and (D) the white pigment and the inorganic filler added as necessary. It is preferable to add a coupling agent. Although it does not specifically limit as a coupling agent, For example, a silane coupling agent and a titanate coupling agent are mentioned. Examples of the silane coupling agent generally include epoxy silane, amino silane, cationic silane, vinyl silane, acryl silane, mercapto silane, and composites thereof, and can be used in any amount. In addition, it is preferable that the compounding quantity of a coupling agent is 5 mass% or less with respect to the whole thermosetting resin composition.
- additives such as antioxidant, a mold release agent, and an ion capture agent, to the tree thermosetting fat composition of this embodiment as needed.
- thermosetting resin composition of the present embodiment can be obtained by uniformly dispersing and mixing the various components described above, and the means and conditions thereof are not particularly limited.
- a general method for producing a thermosetting resin composition there can be mentioned a method in which each component is kneaded with an extruder, a kneader, a roll, an extruder, etc., and then the kneaded product is cooled and pulverized.
- kneading each component it is preferable to carry out in a molten state from the viewpoint of improving dispersibility.
- the kneading conditions may be appropriately determined depending on the type and blending amount of each component.
- kneading is preferably performed at 15 to 100 ° C. for 5 to 40 minutes, more preferably at 20 to 100 ° C. for 10 to 30 minutes. preferable.
- the kneading temperature is less than 15 ° C., it becomes difficult to knead each component and the dispersibility also tends to decrease.
- the kneading temperature exceeds 100 ° C., the resin composition increases in molecular weight, and the resin composition is cured. There is a possibility that. If the kneading time is less than 5 minutes, resin burrs may be generated during transfer molding. If the kneading time exceeds 40 minutes, the resin composition may be increased in molecular weight and the resin composition may be cured.
- thermosetting resin composition of the present invention is produced by passing through a premixing step in which (A) an epoxy resin and (B) a curing agent are mixed in advance, and then adding other components and kneading with a roll mill or an extruder.
- a premixing step in which (A) an epoxy resin and (B) a curing agent are mixed in advance, and then adding other components and kneading with a roll mill or an extruder.
- at least one of (A) epoxy resin and (B) curing agent is liquid at 0 to 35 ° C. or has a low viscosity of less than 10 mPa ⁇ s at 100 to 200 ° C.
- premixing It is preferable to perform a process.
- the thermosetting resin composition obtained by premixing using such (A) epoxy resin and (B) curing agent has improved storage stability and is more excellent in moldability during transfer molding. Become.
- the viscosity of the premix in the premixing step is preferably 10 to 10,000 mPa ⁇ s at 100 to 150 ° C., and more preferably 10 to 10,000 mPa ⁇ s at 100 ° C. If the viscosity is less than 10 mPa ⁇ s, burrs are likely to occur during transfer molding, and if it exceeds 10,000 mPa ⁇ s, the fluidity during molding decreases, making it difficult to pour the thermosetting resin composition into the mold, and the moldability is reduced. There is a tendency to decrease.
- the epoxy resin and (B) the curing reaction product of the curing agent, etc. are deposited into a pre-mixed mixture of precipitates. It is preferable to adjust the mixing conditions so that white turbidity does not occur. “White turbidity due to precipitates” indicates that there is scattering of electromagnetic waves in the visible light region. More specifically, it indicates that there is no fine particle having a scattering center that causes Rayleigh scattering, Mie scattering, and diffraction scattering phenomenon of light.
- the preliminary mixing step specifically, (A) 100 parts by mass of the epoxy resin and (B) 120 parts by mass of the curing agent are weighed in a heat-resistant glass container, and the mixing container is a medium such as silicone oil or water.
- a method of heating at 35 to 180 ° C. using the heater described above can be used.
- the heating method is not limited to the above method, and a thermocouple, electromagnetic wave irradiation, or the like can be used, and ultrasonic waves may be irradiated to promote dissolution.
- thermosetting resin composition containing 120 parts by mass of (B) curing agent with respect to 100 parts by mass of (A) epoxy resin
- 50 parts by mass of (A) epoxy resin and (B) 120 parts by mass of the curing agent is weighed in a container made of heat-resistant glass, and this mixing container is heated at 35 to 180 ° C. using a heater using a fluid such as silicone oil or water to obtain a preliminary mixture.
- the obtained preliminary mixture the remaining (A) 50 parts by mass of the epoxy resin, (C) the curing accelerator and other components may be mixed by roll kneading to produce a thermosetting resin composition. .
- thermosetting resin composition of this embodiment can be pressure-molded to produce a tablet near room temperature (15 to 30 ° C.), and has a light reflectance of 80% or more at a wavelength of 350 to 800 nm after thermosetting. It is preferable that The pressure molding can be performed, for example, at room temperature under conditions of 5 to 50 MPa and 1 to 5 seconds. If the light reflectance is less than 80%, there is a tendency that it cannot sufficiently contribute to the improvement of the luminance of the optical semiconductor device, and a more preferable light reflectance is 90% or more.
- the thermosetting resin composition of the present invention may have a burr length of 5 mm or less when transfer molded under conditions of a molding temperature of 100 ° C. to 200 ° C., a molding pressure of 5 to 20 MPa, and a molding time of 60 to 180 seconds. preferable. If the length of the burr exceeds 5 mm, when manufacturing the optical semiconductor element mounting substrate, resin contamination occurs in the opening (recessed portion) that becomes the optical semiconductor element mounting region, and this is an obstacle to mounting the optical semiconductor element. In addition, there is a possibility that it becomes an obstacle when electrically connecting the optical semiconductor element and the metal wiring. From the viewpoint of workability at the time of manufacturing a semiconductor device, the burr length is more preferably 3 mm or less, and further preferably 1 mm or less.
- thermosetting resin composition of the present embodiment is useful in various applications such as an electrical insulating material, an optical semiconductor sealing material, an adhesive material, a coating material, and an epoxy resin molding material for transfer molding that require high heat resistance. .
- the substrate for mounting a semiconductor element of the present invention has a recess composed of a bottom surface and a wall surface, the bottom surface of the recess is an optical semiconductor element mounting portion, and at least a part of the wall surface of the recess is the thermosetting resin composition of the present invention. It consists of a cured product.
- FIG. 1 is a perspective view showing an embodiment of a substrate for mounting an optical semiconductor element of the present invention.
- the optical semiconductor element mounting substrate 110 includes a metal wiring 105 on which the Ni / Ag plating 104 is formed and a reflector 103, and a recess formed from the metal wiring 105 on which the Ni / Ag plating 104 is formed and the reflector 103. 200.
- the bottom surface of the concave portion 200 is composed of the metal wiring 105 on which the Ni / Ag plating 104 is formed, and the wall surface of the concave portion 200 is composed of the reflector 103.
- the reflector 103 is the thermosetting resin of the present invention. It is a molded article made of a cured product of the composition.
- FIG. 2 is a schematic view showing an embodiment of a process for producing an optical semiconductor element mounting substrate of the present invention.
- the optical semiconductor element mounting substrate is formed by, for example, forming a metal wiring 105 from a metal foil by a known method such as punching or etching, and applying Ni / Ag plating 104 by electroplating (FIG. 2A), A step of placing the metal wiring 105 in a mold 151 having a predetermined shape, injecting the thermosetting resin composition of the present invention from the resin injection port 150 of the mold 151, and performing transfer molding under a predetermined condition (FIG.
- the optical semiconductor element mounting region (recessed portion) 200 is formed on the optical semiconductor element mounting substrate.
- the optical semiconductor element mounting region (concave portion) 200 is surrounded by the reflector 103 made of a cured product of the thermosetting resin composition.
- the transfer molding is preferably performed at a mold temperature of 170 to 200 ° C., a molding pressure of 0.5 to 20 MPa for 60 to 120 seconds, and an after cure temperature of 120 to 180 ° C. for 1 to 3 hours.
- thermosetting resin composition Normally, when an optical semiconductor mounting substrate is manufactured by transfer molding using a thermosetting resin composition, depending on the mold design and molding conditions, the resin is placed in the gap between the upper mold and the lower mold during molding.
- the composition may exude and resin stains may occur.
- the mold surface is mirror-finished, if the mold clamping pressure (clamp pressure) at the time of transfer molding is low and the transfer injection pressure is high, resin contamination tends to occur.
- resin molding does not occur by transfer molding using the thermosetting resin composition of the present invention, or if it is possible to connect the optical semiconductor element in the next process, it is not always necessary to remove the resin contamination. There is no need to perform the process.
- the resin process becomes dirty in the manufacturing process for the purpose of improving the solder wettability, plating property, and die bond paste adhesion of the exposed metal surface on the substrate for mounting the optical semiconductor element.
- the removal process is added.
- the removing step there is a method in which electrolytic degreasing treatment and immersion degreasing treatment are performed, and then the remaining dirt components are removed by high pressure water washing, media blasting, air gun or the like.
- electrolytic degreasing from the viewpoint that the working time is short in degreasing.
- the deflash process which is a process for removing the remaining dirt component
- FIG. 3 is a schematic view showing a resin dirt removing process according to the present embodiment.
- Alkaline electrolytic degreasing is performed by immersing the produced substrate for mounting an optical semiconductor element in a sodium hydroxide solution.
- FIG. 3B is a view showing a state in which the lead frame 501 is used as a cathode and alkaline electrolytic degreasing is performed in an alkaline electrolytic degreasing tank.
- FIG. 3C is a diagram showing a state in which a part of the resin stain 502 has been removed after alkaline electrolytic degreasing.
- deflashing is performed by the impact of the air blow 506, and the remaining resin dirt 502 is removed.
- FIG. 3E is a diagram showing a state in which the resin stain 502 after deflashing is completely removed.
- the deflash method is not limited to air blow.
- the treatment liquid used in the degreasing treatment is shown below.
- the treatment liquid is not limited to these.
- alkaline aqueous solution sodium hydroxide, potassium hydroxide, alkali metal, alkaline earth metal hydroxide can be used.
- concentration is preferably 10 to 200 g / L, pH 11 to 14, and the treatment temperature is preferably 20 to 80 ° C.
- the immersion degreasing treatment time is 0.5 to 30 minutes. In the case of electrolytic degreasing, the concentration and the treatment temperature conditions are the same as in the immersion treatment, and the current density is in the range of 0.5 to 10 A / dm 2 and the treatment time is 0.5 to 5 minutes.
- the cured product has high alkali resistance and can sufficiently reduce elution of the resin component, so that it retains a good appearance even after the removal step. Can do.
- An optical semiconductor device of the present invention includes the optical semiconductor element mounting substrate, an optical semiconductor element provided in a recess of the optical semiconductor element mounting substrate, and a sealing resin that fills the recess and seals the optical semiconductor element. Part.
- FIG. 4 is a perspective view showing an embodiment in which the optical semiconductor element 100 is mounted on the optical semiconductor element mounting substrate 110 of the present invention.
- the optical semiconductor element 100 is mounted at a predetermined position of the optical semiconductor element mounting region (recessed portion) 200 of the optical semiconductor element mounting substrate 110 and is electrically connected by the metal wiring 105 and the bonding wire 102.
- the 5 and 6 are schematic cross-sectional views showing an embodiment of the optical semiconductor device of the present invention.
- the optical semiconductor device includes an optical semiconductor element mounting substrate 110, an optical semiconductor element 100 provided at a predetermined position in the concave portion 200 of the optical semiconductor element mounting substrate 110, and the concave portion 200.
- the optical semiconductor element 100 and the metal wiring 105 are bonded by bonding wires 102 or solder bumps 107. Electrically connected.
- FIG. 7 is also a schematic cross-sectional view showing an embodiment of the optical semiconductor device of the present invention.
- the LED element 300 is disposed via a die bonding material 306 at a predetermined position on the lead 304 on which the reflector 303 is formed, and the LED element 300 and the lead 304 are electrically connected by the bonding wire 301.
- the LED body element 300 is sealed with a transparent sealing resin 302 that is connected and includes a phosphor 305.
- the weight average molecular weight Mw was measured using a standard polystyrene calibration curve by gel permeation chromatography (GPC) under the following conditions.
- Apparatus Pump (manufactured by Hitachi, Ltd., trade name: L-6200 type), column (manufactured by Tosoh Corporation, trade name: TSKgel-G5000HXL, TSKgel-G2000HXL), detector (manufactured by Hitachi, Ltd., trade name) : L-3300RI type) ⁇
- Eluent Tetrahydrofuran, flow rate 1.0 mL / min ⁇ Measurement temperature: 30 ° C.
- Viscosity measurement was conducted by Research Equipment (LonCon) LTC. This was carried out using an ICI cone plate viscometer made by the manufacturer.
- the softening point was measured using a ring and ball softening point test method according to JIS K 2207.
- thermosetting resin composition in terms of both softening point and viscosity
- thermosetting resin composition as a curing agent. Can be suitably used.
- thermosetting resin composition (Examples 1 to 11, Comparative Examples 1 to 10) According to the mixing ratio (parts by mass) shown in Tables 2 to 5, after (A) epoxy resin and (B) curing agent were premixed, the remaining components were added and mixed thoroughly using a mixer, and then mixed with a mixing roll. The mixture was melt-kneaded under predetermined conditions, cooled and pulverized to prepare thermosetting resin compositions of Examples 1 to 11 and Comparative Examples 1 to 10.
- thermosetting resin composition was transfer molded using a transfer molding machine “ATOM-FX” manufactured by MTEX under the conditions of a molding die temperature of 180 ° C., a molding pressure of 6.9 MPa, and a curing time of 90 seconds. Evaluation was performed. The evaluation results are shown in Tables 2-5.
- thermosetting resin composition (Removability evaluation of resin dirt) Using the obtained thermosetting resin composition, molding is performed under the conditions of a molding die temperature of 180 ° C., a clamping pressure of 20 t, an injection pressure of 7 MPa, and a molding time of 90 seconds using a transfer molding machine “ATOM-FX” manufactured by MTEX. Then, an optical semiconductor element mounting substrate was produced.
- a test lead frame capable of forming 12 (2 rows ⁇ 6 columns) optical semiconductor element mounting substrates each having an outer periphery of 10 mm ⁇ 10 mm per lead frame was used.
- the metal wiring for the optical semiconductor element mounting area on the lead frame is a 0.25 ⁇ m thick copper lead frame whose surface is Ag plated, and the cathode and anode of one optical semiconductor element mounting area are designed as 3 pairs of patterns. did.
- Electrode degreasing using an aqueous alkali solution is performed on the substrate with the optical semiconductor element mounted on the lead frame, and the substrate is washed with water while applying ultrasonic waves for 30 seconds. Burr) was removed.
- the presence or absence of residual resin stains after deflashing and the appearance of the reflector part were evaluated according to the following criteria. A: No change in appearance. B: There is almost no change in appearance, but there is some elution. C: The resin component is eluted from the cured product, resulting in unevenness.
- thermosetting resin composition of the present invention has a smaller weight change rate before and after the immersion treatment than the thermosetting resin composition of the comparative example, and is excellent in alkali resistance.
- thermosetting resin composition of the present invention By carrying out transfer molding using the thermosetting resin composition of the present invention, a substrate for mounting an optical semiconductor element from which resin stains in the optical semiconductor element mounting region are removed can be produced.
- the optical semiconductor element can be mounted in the opening of the optical semiconductor element mounting region, and the optical semiconductor element and the metal wiring can be electrically connected by a known method such as a bonding wire.
- thermosetting resin composition which can form the hardened
- the optical semiconductor element mounting substrate using the same And a method for manufacturing the same, and an optical semiconductor device can be provided.
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Abstract
Description
本発明の多価カルボン酸縮合体は、カルボキシル基含有化合物を分子間で縮合した多価カルボン酸縮合体であって、水への溶解度が30℃で100g/L以下であるカルボキシル基含有化合物由来の構成単位を有するものである。ここで、本明細書における溶解度は、カルボキシル基含有化合物を30℃で蒸留水に溶解させて得られる飽和水溶液の蒸留水1Lあたりの溶質の重量を指す。
(GPC条件)
ポンプ:L-6200型(株式会社日立製作所製、商品名)
カラム:TSKgel―G5000HXL及びTSKgel-G2000HXL(東ソー株式会社製、商品名)
検出器:L-3300RI型(株式会社日立製作所製、商品名)
溶離液:テトラヒドロフラン
測定温度:30℃
流量:1.0mL/分
本発明の熱硬化性樹脂組成物は、(A)エポキシ樹脂及び(B)硬化剤を含有するものである。
(A)エポキシ樹脂としては、電子部品封止用エポキシ樹脂成形材料で一般に使用されているものを用いることができる。エポキシ樹脂として、例えば、フェノールノボラック型エポキシ樹脂及びオルソクレゾールノボラック型エポキシ樹脂等のフェノール類とアルデヒド類のノボラック樹脂をエポキシ化したもの、ビスフェノールA、ビスフェノールF、ビスフェノールS及びアルキル置換ビスフェノール等のジグリシジルエーテル、ジアミノジフェニルメタン及びイソシアヌル酸等のポリアミンとエピクロルヒドリンとの反応により得られるグリシジルアミン型エポキシ樹脂、オレフィン結合を過酢酸等の過酸で酸化して得られる線状脂肪族エポキシ樹脂、並びに脂環族エポキシ樹脂が挙げられる。これらは、1種を単独で又は2種以上を組み合わせて用いることができる。
本実施形態に係る硬化剤は、上述の多価カルボン酸縮合体を含むものであればよい。すなわち、硬化剤は、カルボキシル基含有化合物を分子間で縮合した多価カルボン酸縮合体であり、水への溶解度が30℃で100g/L以下であるカルボン酸由来の構成単位を有する多価カルボン酸縮合体を含む。(B)硬化剤が、このような多価カルボン酸縮合体を含むことで、熱硬化性樹脂組成物から形成された硬化物のアルカリ性の脱脂液に対する耐性が向上する。
本発明の熱硬化性樹脂組成物には必要に応じて(C)硬化促進剤を配合することができる。(C)硬化促進剤としては、(A)及び(B)成分間の硬化反応を促進させるような触媒機能を有するものであれば、特に限定されることなく用いることができる。硬化促進剤としては、例えば、アミン化合物、イミダゾール化合物、有機リン化合物、アルカリ金属化合物、アルカリ土類金属化合物、第4級アンモニウム塩が挙げられる。これらの硬化促進剤の中でも、アミン化合物、イミダゾール化合物又は有機リン化合物を用いることが好ましい。アミン化合物としては、例えば、1,8-ジアザ-ビシクロ(5,4,0)ウンデセン-7、トリエチレンジアミン、トリ-2,4,6-ジメチルアミノメチルフェノールが挙げられる。また、イミダゾール化合物として、例えば、2-エチル-4-メチルイミダゾールが挙げられる。更に、有機リン化合物としては、例えば、トリフェニルホスフィン、テトラフェニルホスホニウムテトラフェニルボレート、テトラ-n-ブチルホスホニウム-o,o-ジエチルホスホロジチオエート、テトラ-n-ブチルホスホニウム-テトラフルオロボレート、テトラ-n-ブチルホスホニウム-テトラフェニルボレートが挙げられる。これらの硬化促進剤は、1種を単独で又は2種以上を組み合わせて使用してもよい。
光半導体装置などに利用可能な白色の成形樹脂として用いる場合には、本発明の熱硬化性樹脂組成物に更に(D)白色顔料を含むことが好ましい。(D)白色顔料としては、公知のものを使用することができ、特に限定されない。白色顔料として、例えば、アルミナ、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が挙げられる。これらは1種を単独で又は2種以上併用することができる。無機中空粒子としては、例えば、珪酸ソーダガラス、アルミ珪酸ガラス、硼珪酸ソーダガラス、シラス(白砂)が挙げられる。白色顔料の粒径は、中心粒径が0.1~50μmであることが好ましい。この中心粒径が0.1μm未満であると粒子が凝集しやすく分散性が低下する傾向があり、50μmを超えると熱硬化性樹脂組成物からなる硬化物の反射特性が十分に得られ難くなる。
(無機充填材)
熱硬化性樹脂組成物は成形性を調整するために、無機充填材を含むことが好ましい。なお、無機充填剤として、上記白色顔料と同様のものを用いてもよい。無機充填材として、例えば、シリカ、酸化アンチモン、酸化チタン、水酸化アルミニウム、水酸化マグネシウム、硫酸バリウム、炭酸マグネシウム、炭酸バリウム、アルミナ、マイカ、ベリリア、チタン酸バリウム、チタン酸カリウム、チタン酸ストロンチウム、チタン酸カルシウム、炭酸アルミニウム、ケイ酸アルミニウム、炭酸カルシウム、ケイ酸カルシウム、ケイ酸マグネシウム、窒化ケイ素、窒化ホウ素、焼成クレー等のクレー、タルク、ホウ酸アルミニウム、ホウ酸アルミニウム、炭化ケイ素が挙げられる。熱伝導性、光反射特性、成形性及び難燃性の点から、無機充填剤は、シリカ、アルミナ、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、水酸化アルミニウム、水酸化マグネシウムからなる群から選ばれる2種以上の混合物であることが好ましい。無機充填材の平均粒径は、白色顔料とのパッキング性を向上させる観点から、1~100μmであることが好ましく、1~40μmであることがより好ましい。本実施形態の熱硬化性樹脂組成物における無機充填剤の配合量は、(A)成分及び(B)成分の合計量100質量部に対して、1~1000質量部であることが好ましく、1~800質量部であることがより好ましい。
熱硬化性樹脂組成物には、熱硬化性樹脂成分である(A)~(C)成分と、(D)白色顔料及び必要に応じて添加される無機充填材との接着性を向上させる観点からカップリング剤を添加することが好ましい。カップリング剤としては、特に限定されないが、例えば、シランカップリング剤及びチタネート系カップリング剤が挙げられる。シランカップリング剤としては、一般にエポキシシラン系、アミノシラン系、カチオニックシラン系、ビニルシラン系、アクリルシラン系、メルカプトシラン系及びこれらの複合系が挙げられ、任意の添加量で用いることができる。なお、カップリング剤の配合量は、熱硬化性樹脂組成物全体に対して5質量%以下であることが好ましい。
本実施形態の熱硬化性樹脂組成物は、上記した各種成分を均一に分散混合することで得ることができ、その手段や条件等は特に限定されない。熱硬化性樹脂組成物を作製する一般的な方法として、各成分を押出機、ニーダー、ロール、エクストルーダー等によって混練した後、混練物を冷却し、粉砕する方法を挙げることができる。各成分を混練する際には、分散性を向上する観点から、溶融状態で行うことが好ましい。混練の条件は、各成分の種類や配合量により適宜決定すればよく、例えば、15~100℃で5~40分間混練することが好ましく、20~100℃で10~30分間混練することがより好ましい。混練温度が15℃未満であると、各成分を混練させ難くなり、分散性も低下する傾向にあり、100℃を超えると、樹脂組成物の高分子量化が進行し、樹脂組成物が硬化してしまう可能性がある。また、混練時間が5分未満であると、トランスファー成形時に樹脂バリが発生してしまう可能性がある。混練時間が40分を超えると、樹脂組成物の高分子量化が進行し、樹脂組成物が硬化してしまう可能性がある。
本発明の半導体素子搭載用基板は、底面及び壁面から構成される凹部を有し、凹部の底面が光半導体素子搭載部であり、凹部の壁面の少なくとも一部が本発明の熱硬化性樹脂組成物の硬化物からなるものである。図1は、本発明の光半導体素子搭載用基板の一実施形態を示す斜視図である。光半導体素子搭載用基板110は、Ni/Agめっき104が形成された金属配線105と、リフレクター103とを備え、Ni/Agめっき104が形成された金属配線105とリフレクター103とから形成された凹部200を有している。すなわち、凹部200の底面はNi/Agめっき104が形成された金属配線105から構成され、凹部200の壁面はリフレクター103から構成されるものであり、リフレクター103は、上記本発明の熱硬化性樹脂組成物の硬化物からなる成形体である。
通常、熱硬化性樹脂組成物を用いたトランスファー成形によって光半導体搭載用基板を製造しようとした場合、金型設計や成形条件によっては成形時に成形金型の上型と下型との隙間に樹脂組成物が染み出し、樹脂汚れが発生することがある。例えば、金型表面が鏡面仕上げの場合、トランスファー成形時の型締圧(クランプ圧)が低く、トランスファー射出圧が高いと、樹脂汚れが発生しやすい傾向にある。ただし、本発明の熱硬化性樹脂組成物を用いてトランスファー成形を行い樹脂汚れが発生しなかった場合、又は、次工程の光半導体素子の接続が可能である場合には、必ずしも樹脂汚れの除去工程は行う必要がない。
本発明の光半導体装置は、上記光半導体素子搭載用基板と、光半導体素子搭載用基板の凹部内に設けられた光半導体素子と、凹部を充填して光半導体素子を封止する封止樹脂部とを備えるものである。
下記合成例A1、A3及び比較合成例A2において、それぞれ繰り返し単位用モノマーと両末端用のモノマーとを、無水酢酸中で5~60分にわたって窒素雰囲気下で還流した後、温度を180℃まで上昇させ、窒素気流下、開放系で反応によって生成した酢酸及び水を留去した。揮発成分が認められなくなったところで、反応容器内を減圧しながら180℃の温度で1~15時間にわたって溶融縮合し、多価カルボン酸縮合体を得た。
繰り返し単位:水素化テレフタル酸(東京化成社製);125g
両末端:1,2-無水トリメリット酸(三菱ガス化学社製);126g
(合成例A3)
繰り返し単位:水素化テレフタル酸(東京化成社製);170g
両末端:1,2-無水トリメリット酸(三菱ガス化学社製);195g
(比較合成例A2)
繰り返し単位:水素化テレフタル酸(東京化成社製);125g
両末端:水素化-1,2-無水トリメリット酸(三菱ガス化学社製);126g
合成例A1、A3及び比較合成例A2の多価カルボン酸縮合体の重量平均分子量、粘度及び軟化点を評価した。その結果を表1に示す。
・装置:ポンプ(株式会社日立製作所製、商品名:L-6200型)、カラム(東ソー株式会社製、商品名:TSKgel―G5000HXL、TSKgel-G2000HXL)、検出器(株式会社日立製作所製、商品名:L-3300RI型)
・溶離液:テトラヒドロフラン、流量1.0mL/分
・測定温度:30℃
(実施例1~11、比較例1~10)
表2~5に示した配合比(質量部)に従い、(A)エポキシ樹脂、(B)硬化剤を予備混合した後、残りの成分を加え、ミキサーを用いて十分混合した後、ミキシングロールにより所定条件で溶融混練し、冷却、粉砕を行い、実施例1~11及び比較例1~10の熱硬化性樹脂組成物を作製した。
得られた熱硬化性樹脂組成物をMTEX社製トランスファー成形機「ATOM-FX」を用い、成形金型温度180℃、成形圧力6.9MPa、キュア時間90秒の条件でトランスファー成形し、下記の評価を行った。評価結果を表2~5に示す。
上記成形条件で作製した10mm×10mm×3mmのテストピースを用い、水酸化ナトリウム水溶液に浸漬前後の重量を測定し、硬化物のアルカリ水溶液に対する溶出度合いを評価した。浸漬条件は、水酸化ナトリウム水溶液の濃度125g/L、浸漬温度50℃、浸漬時間5分間又は30分間とした。なお、浸漬処理後のテストピースは、浸漬後水洗し、水中で30秒間にわたって超音波処理を行い、再度水洗した後、150℃で30分間乾燥させた後、重量変化を測定した。
重量変化率(%)=(浸漬前のテストピースの重量(g)-浸漬後のテストピースの重量(g))/浸漬前のテストピースの重量(g)×100
得られた熱硬化性樹脂組成物を用い、MTEX社製トランスファー成形機「ATOM-FX」を用い、成形金型温度180℃、クランプ圧力20t、注入圧7MPa、成形時間90秒の条件で成形を行い、光半導体素子搭載用基板を作製した。
A…外観の変化無し。
B…外観変化はほとんどないが、一部溶出あり。
C…硬化物から樹脂成分が溶出して凹凸が発生。
*1:トリスグリシジルイソシアヌレート(エポキシ当量100、日産化学社製、商品名:TEPIC-S)
*2:メチルメタクリレート-グリシジルメタクリレート共重合体(エポキシ当量181、重量平均分子量10000、日油社製、商品名:CP50M)
*3:ビスフェノールA型エポキシ樹脂(エポキシ当量450、重量平均分子量900、ジャパンエポキシレジン株式会社製、商品名:エピコート1001)
*4:テトラヒドロ無水フタル酸(新日本理化株式会社製、商品名:リカシッドTH)
*5:無水トリメリット酸(三菱ガス化学株式会社製、商品名:TMA)
*6:無水コハク酸(新日本理化株式会社製、商品名:リカシッドSA)
*7:ヘキサヒドロ無水フタル酸(新日本理化株式会社製、商品名リカシッドHH)
*8:テトラ-n-ブチルホスホニウム-o,o-ジエチルホスホロジチエート(日本化学工業社製、商品名:PX-4ET)
*9:テトラ-n-ブチルホスホニウムテトラフェニルボレート(日本化学工業社製、商品名:PX-4PB)
*10:トリエトキシアミノシラン(東レダウコーニング社製、商品名:Z6011)
*11:トリメトキシエポキシシラン(東レダウコーニング社製、商品名:S6040)
*12:溶融シリカ(電気化学工業社製、商品名:FB-950)
*13:溶融シリカ(電気化学工業社製、商品名:S0-25R)
*14:中空粒子(住友3M社製、商品名:S60-HS)
*15:酸化チタン(石原産業社製、商品名:CR-63)
Claims (17)
- カルボキシル基含有化合物を分子間で縮合した多価カルボン酸縮合体であって、
水への溶解度が30℃で100g/L以下であるカルボキシル基含有化合物由来の構成単位を有する多価カルボン酸縮合体。 - 前記カルボキシル基含有化合物由来の構成単位を末端基として有する、請求項1記載の多価カルボン酸縮合体。
- 前記カルボキシル基含有化合物由来の構成単位が、トリメリット酸、テトラヒドロフタル酸、フタル酸、ピロメリット酸、フマル酸及び安息香酸からなる群より選ばれる少なくとも一種のカルボキシル基含有化合物から誘導される構成単位である、請求項1又は2記載の多価カルボン酸縮合体。
- 前記Rxが、脂肪族炭化水素環を有し該脂肪族炭化水素環がハロゲン原子又は直鎖状若しくは分岐状の炭化水素基で置換されていてもよい2価の基である、請求項4記載の多価カルボン酸縮合体。
- (A)エポキシ樹脂及び(B)硬化剤を含有する熱硬化性樹脂組成物であって、
前記(B)硬化剤が、請求項1~6のいずれか一項に記載の多価カルボン酸縮合体を含む、熱硬化性樹脂組成物。 - 前記多価カルボン酸縮合体の配合量が、前記(A)エポキシ樹脂100質量部に対して10~150質量部である、請求項7~9のいずれか一項に記載の熱硬化性樹脂組成物。
- 前記(A)エポキシ樹脂中に含まれるエポキシ基と、当該エポキシ基と反応可能な前記(B)硬化剤中に含まれる酸無水物基との当量比が、1:0.3~1:1.2である、請求項7~11のいずれか一項に記載の熱硬化性樹脂組成物。
- (D)白色顔料を更に含有する、請求項7~12のいずれか一項に記載の熱硬化性樹脂組成物。
- 前記(D)白色顔料が、アルミナ、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る少なくとも1種の無機物を含む、請求項13記載の熱硬化性樹脂組成物。
- 底面及び壁面から構成される凹部を有し、
前記凹部の底面が光半導体素子搭載部であり、前記凹部の壁面の少なくとも一部が請求項7~14のいずれか一項に記載の熱硬化性樹脂組成物の硬化物からなる、光半導体素子搭載用基板。 - 底面及び壁面から構成される凹部を有する光半導体素子搭載用基板の製造方法であって、
前記凹部の壁面の少なくとも一部を、請求項7~14のいずれか一項に記載の熱硬化性樹脂組成物を用いて形成する工程を備える、光半導体素子搭載用基板の製造方法。 - 底面及び壁面から構成される凹部を有する光半導体素子搭載用基板と、
前記光半導体素子搭載用基板の凹部内に設けられた光半導体素子と、
前記凹部を充填して前記光半導体素子を封止する封止樹脂部と、
を備え、
前記凹部の壁面の少なくとも一部が、請求項7~14のいずれか一項に記載の熱硬化性樹脂組成物の硬化物からなる、光半導体装置。
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JP2018519673A (ja) * | 2015-07-07 | 2018-07-19 | ルミレッズ ホールディング ベーフェー | 光を発するデバイス |
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