WO2012073742A1 - マイクロレンズ用感光性樹脂組成物 - Google Patents
マイクロレンズ用感光性樹脂組成物 Download PDFInfo
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- WO2012073742A1 WO2012073742A1 PCT/JP2011/076812 JP2011076812W WO2012073742A1 WO 2012073742 A1 WO2012073742 A1 WO 2012073742A1 JP 2011076812 W JP2011076812 W JP 2011076812W WO 2012073742 A1 WO2012073742 A1 WO 2012073742A1
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- group
- resin composition
- photosensitive resin
- microlenses
- formula
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- 0 C*C(C(C(C)C)C(N1)O)C1O Chemical compound C*C(C(C(C)C)C(N1)O)C1O 0.000 description 1
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
- G02B1/041—Lenses
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/022—Quinonediazides
- G03F7/023—Macromolecular quinonediazides; Macromolecular additives, e.g. binders
- G03F7/0233—Macromolecular quinonediazides; Macromolecular additives, e.g. binders characterised by the polymeric binders or the macromolecular additives other than the macromolecular quinonediazides
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/26—Esters containing oxygen in addition to the carboxy oxygen
- C08F220/32—Esters containing oxygen in addition to the carboxy oxygen containing epoxy radicals
- C08F220/325—Esters containing oxygen in addition to the carboxy oxygen containing epoxy radicals containing glycidyl radical, e.g. glycidyl (meth)acrylate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/34—Esters containing nitrogen, e.g. N,N-dimethylaminoethyl (meth)acrylate
- C08F220/343—Esters containing nitrogen, e.g. N,N-dimethylaminoethyl (meth)acrylate in the form of urethane links
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F222/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a carboxyl radical and containing at least one other carboxyl radical in the molecule; Salts, anhydrides, esters, amides, imides, or nitriles thereof
- C08F222/36—Amides or imides
- C08F222/40—Imides, e.g. cyclic imides
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/0005—Production of optical devices or components in so far as characterised by the lithographic processes or materials used therefor
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/40—Treatment after imagewise removal, e.g. baking
Definitions
- the present invention relates to a photosensitive resin composition for microlenses. More specifically, the present invention relates to a photosensitive resin composition for a microlens that can remarkably improve transparency, heat resistance, heat discoloration resistance and solvent resistance.
- polyhydroxystyrene is known as a material for forming a microlens.
- the polyhydroxystyrene tends to be colored by heating at a high temperature, the transparency tends to deteriorate, and coloring may be observed when the microlens is used.
- Patent Documents 1 to 4 a photoresist composition containing a maleimide copolymer, an antireflection film-forming composition, a material for forming a resist protective film for immersion lithography, and the like have been proposed (Patent Documents 1 to 4).
- insulating films for display devices such as liquid crystal displays (LCDs) and organic electroluminescence display devices
- alkali-soluble copolymers comprising indene, maleimide and N-substituted maleimide, 1,2-naphthoquinonediazide compounds
- a method for forming an insulating film for a display device, which uses a radiation-sensitive resin composition containing a crosslinking agent has been proposed (Patent Document 5).
- a maleimide copolymer comprising a monomer structural unit derived from styrene, a monomer structural unit derived from styrenes, and a monomer structure derived from (meth) acrylic acid (patent) Reference 6).
- [A] (a1) unsaturated carboxylic acid and / or unsaturated carboxylic anhydride, (a2) epoxy group-containing unsaturated compound, (a3) maleimide monomer and (a4) other olefinically unsaturated compound
- a radiation-sensitive resin composition characterized in that it contains a polymer and a [B] 1,2-quinonediazide compound has been reported (Patent Document 7).
- Patent Document 7 it is explained that the radiation-sensitive resin composition reported in this document can provide a high radiation sensitivity and can easily form a patterned thin film excellent in solvent resistance, heat resistance, transparency, and heat discoloration. However, it does not suggest the pattern shape formed from the composition or its heat resistance. Further, no unsubstituted maleimide is described as a maleimide monomer.
- the present invention has been made based on the above circumstances, and the problem to be solved is a microlens that can remarkably improve transparency, heat resistance, heat discoloration resistance, solvent resistance, and patterning properties. It is providing the photosensitive resin composition.
- Photosensitizer In the above formula (2), R 0 represents a hydrogen atom or a methyl group, R 1 represents a single bond or an alkylene group having 1 to 5 carbon atoms, and R 2 represents a monovalent organic group having thermal crosslinkability. However, R 0 may be different from each other in the repeating structural unit represented by the formula (2).
- the component (A) is a copolymer having at least one of the three repeating structural units represented by the following formula (3), formula (4) and formula (5).
- X represents an alkyl group having 1 to 5 carbon atoms, a cycloalkyl group having 5 or 6 carbon atoms, a phenyl group or a benzyl group, provided that the alkyl group, the cycloalkyl group, In the phenyl group and the benzyl group, part or all of the hydrogen atoms may be substituted with a halogen atom, a carboxyl group, a hydroxyl group, an amino group, or a nitro group.
- Y represents a phenyl group, a naphthyl group, an anthracenyl group, a biphenylyl group or an alkoxy group having 1 to 8 carbon atoms, provided that the phenyl group, the naphthyl group, the anthracenyl group and the biphenylyl group
- some or all of the hydrogen atoms may be substituted with an alkyl group having 1 to 10 carbon atoms, a halogen atom, a carboxyl group, a hydroxyl group, an amino group, or a nitro group.
- the photosensitive resin composition for a microlens according to any one of the first aspect to the third aspect which further contains a crosslinking agent as the component (C).
- the photosensitive resin composition for a microlens according to any one of the first to fourth aspects wherein the polymer has a weight average molecular weight of 1,000 to 50,000.
- the film formed from the photosensitive resin composition for microlenses of the present invention can have excellent transparency, heat resistance, heat discoloration resistance and solvent resistance. Moreover, the pattern formed from the photosensitive resin composition for microlenses of this invention can also have the outstanding heat resistance. From the above, the film formed from the photosensitive resin composition for microlenses of the present invention is colored when the heat treatment is performed at a high temperature in the formation process or the formation process of peripheral devices such as wiring. In addition, the possibility that the lens shape is deformed can be significantly reduced. In addition, when the electrode and wiring forming process is performed after the microlens is formed, problems such as deformation and peeling of the microlens due to the organic solvent can be significantly reduced. Therefore, the photosensitive resin composition for a microlens of the present invention is suitable as a material for forming a microlens.
- the present invention contains a copolymer having a maleimide structural unit as component (A) and a repeating structural unit to which a monovalent organic group having thermal crosslinkability is bonded, a photosensitive agent as component (B), and a solvent.
- This is a photosensitive resin composition for microlenses.
- the solid content obtained by removing the solvent from the photosensitive resin composition for microlenses of the present invention is usually 1 to 50% by mass.
- the component (A) of the present invention is a copolymer having a maleimide structural unit represented by the following formula (1) and a repeating structural unit represented by the following formula (2).
- R 0 represents a hydrogen atom or a methyl group
- R 1 represents a single bond or an alkylene group having 1 to 5 carbon atoms
- R 2 represents a monovalent organic group having thermal crosslinkability.
- R 0 may be different from each other in the repeating structural unit represented by the formula (2).
- the monovalent organic group R 2 having thermal crosslinkability preferably contains an epoxy group or a blocked isocyanate group.
- R 2 is more preferably an organic group containing an epoxy group, and film shrinkage due to heat treatment can be reduced.
- the organic group containing an epoxy group may be a non-alicyclic structure or an alicyclic structure.
- the formula (2) which is a repeating structural unit when R 2 is an organic group containing an epoxy group
- the organic group containing the epoxy group is a non-alicyclic structure as follows. If it is a repeating structural unit represented by the formula (6) or an alicyclic structure, a repeating structural unit represented by the following formula (7) may be mentioned.
- each R 0 independently represents a hydrogen atom or a methyl group
- each R 1 independently represents a single bond or an alkylene group having 1 to 5 carbon atoms.
- R 0 is preferably a methyl group
- R 1 is preferably a methylene group.
- the blocked isocyanate group is a compound in which an isocyanate group (—N ⁇ C ⁇ O) is blocked with an appropriate protective group.
- the blocking agent include methanol, ethanol, isopropanol, n-butanol, 2-ethoxyhexanol, 2-N, N-dimethylaminoethanol, 2-ethoxyethanol, cyclohexanol and other alcohols, phenol, o-nitrophenol.
- Phenols such as p-chlorophenol, o-cresol, m-cresol, p-cresol, lactams such as ⁇ -caprolactam, acetone oxime, methyl ethyl ketone oxime, methyl isobutyl ketone oxime, cyclohexanone oxime, acetophenone oxime, benzophenone oxime, etc.
- Oximes, pyrazoles such as pyrazole, 3,5-dimethylpyrazole and 3-methylpyrazole, and thiols such as dodecanethiol and benzenethiol. .
- formula (2) which is a repeating structural unit when R 2 is an organic group containing a blocked isocyanate group
- R 2 is an organic group containing a blocked isocyanate group
- formula (2) includes a repeating structural unit represented by the following formula (8), and the following formula ( The repeating structural unit represented by 9) is mentioned, and the repeating structural unit represented by the following formula (8) is preferable from the viewpoint of the desorption temperature of the blocking agent.
- R 0 each independently represents a hydrogen atom or a methyl group
- R 1 each independently represents a single bond or an alkylene group having 1 to 5 carbon atoms.
- R 0 is preferably a methyl group
- R 1 is preferably an ethylene group.
- the component (A) may be a copolymer having at least one of three types of repeating structural units represented by the following formula (3), formula (4) and formula (5).
- X represents an alkyl group having 1 to 5 carbon atoms, a cycloalkyl group having 5 or 6 carbon atoms, a phenyl group or a benzyl group, provided that the alkyl group, the cycloalkyl group, In the phenyl group and the benzyl group, part or all of the hydrogen atoms may be substituted with a halogen atom, a carboxyl group, a hydroxyl group, an amino group, or a nitro group.
- Y represents a phenyl group, a naphthyl group, an anthracenyl group, a biphenylyl group, or an alkoxy group having 1 to 8 carbon atoms.
- the phenyl group, the naphthyl group, the anthracenyl group, and the biphenylyl group are an alkyl group, a halogen atom, a carboxyl group, a hydroxyl group, an amino group, or a nitro group in which some or all of the hydrogen atoms have 1 to 10 carbon atoms. It may be substituted with a group.
- the content of the repeating structural unit represented by the above formula (1) is 10 mol% to 90 mol%, preferably 20 mol% to 70 mol%.
- the content of the repeating structural unit represented by the above formula (2) is 10 mol% to 90 mol%, preferably 20 mol% to 70 mol%.
- the content thereof is 10 mol% to 90 mol%.
- it is 20 mol% to 70 mol%.
- the weight average molecular weight of the copolymer is usually 1000 to 50000, preferably 1500 to 30000.
- the weight average molecular weight is a value obtained by using gel as a standard sample by gel permeation chromatography (GPC).
- the content of the component (A) in the microlens photosensitive resin composition of the present invention is usually 1 to 99% by mass based on the content in the solid content of the microlens photosensitive resin composition. Yes, preferably 10 to 95% by mass.
- the method for obtaining the component (A) is not particularly limited, but in general, the monomer mixture containing the monomer species used for obtaining the above-described copolymer is usually 50 to 110 ° C. in a polymerization solvent. It can be obtained by polymerizing at a temperature.
- the photosensitive agent which is the component (B) of the present invention is not particularly limited as long as it is a compound that can be used as a photosensitive component, but a 1,2-naphthoquinonediazide compound is preferable.
- the 1,2-naphthoquinonediazide compound is a compound having a hydroxyl group, and among these hydroxyl groups, 10 to 100 mol%, preferably 20 to 95 mol% is 1,2-naphthoquinonediazidesulfonic acid ester. Compound can be used.
- Examples of the compound having a hydroxyl group include phenol, o-cresol, m-cresol, p-cresol, hydroquinone, resorcinol, catechol, methyl gallate, ethyl gallate, 1,3,3-tris (4-hydroxy Phenyl) butane, 4,4′-isopropylidene diphenol, 1,1-bis (4-hydroxyphenyl) cyclohexane, 4,4′-dihydroxydiphenyl sulfone, 4,4 ′-(hexafluoroisopropylidene) diphenol, 4,4 ′, 4 ′′ -trishydroxyphenylethane, 1,1,1-trishydroxyphenylethane, 4,4 ′-[1- [4- [1- (4-hydroxyphenyl) -1-methylethyl ] Phenyl] ethylidene] bisphenol, 2,4-dihydroxyben Zophenone, 2,3,4-trihydroxybenzophenone, 2,
- These photosensitizers can be used alone or in combination of two or more.
- the content of the component (B) in the photosensitive resin composition for microlenses of the present invention is usually 1 to 50% by mass based on the content in the solid content of the photosensitive resin composition for microlenses.
- the photosensitive resin composition for microlenses of this invention can also contain a crosslinking agent as (C) component.
- the crosslinking agent which is the component (C) of the present invention is a compound which forms a bond with a compounded composition such as a resin or a photosensitive agent or other crosslinking agent molecules by the action of heat or acid.
- Examples of the crosslinking agent include polyfunctional (meth) acrylate compounds, epoxy compounds, hydroxymethyl group-substituted phenol compounds, and compounds having an alkoxyalkylated amino group. These crosslinking agents can be used alone or in combination of two or more.
- polyfunctional (meth) acrylate compound examples include trimethylolpropane tri (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, and dipentaerythritol.
- epoxy compound for example, a compound represented by the following general formula (10) can be used.
- k represents an integer of 2 to 10
- m represents an integer of 0 to 4
- R 3 represents a k-valent organic group.
- Specific examples of the compound having a cyclohexene oxide structure in which m is 2 in the compound represented by the above formula (10) include compounds represented by the following formulas (11) and (12), and commercially available compounds shown below. Products, but are not limited to these examples. Examples of commercially available products include Epolide (registered trademark) GT-401, GT-403, GT-301, GT-302, Celoxide (registered trademark) 2021, and 3000 (above, manufactured by Daicel Chemical Industries, Ltd.) ).
- the compound shown by the following general formula (13) can also be used as an epoxy compound.
- k represents an integer of 2 to 10
- R 4 represents a k-valent organic group.
- Specific examples of the compound having an oxirane structure represented by the above formula (13) include the following commercially available products, but are not limited to these examples.
- Examples of the alicyclic epoxy resin include Denacol (registered trademark) EX-252 (manufactured by Nagase Chemmutex Co., Ltd.), EPICLON (registered trademark) 200, 400 (manufactured by DIC Corporation), and jER (registered). Trademarks) 871 and 872 (above, manufactured by Mitsubishi Chemical Corporation).
- Examples of the bisphenol A type epoxy resin include jER (registered trademark) 828, 834, 1001, and 1004 (above, manufactured by Mitsubishi Chemical Corporation), EPICLON (registered trademark) 850, 860, and 4055 (or more). DIC Corporation).
- Examples of the bisphenol F type epoxy resin include jER (registered trademark) 807 (manufactured by Mitsubishi Chemical Corporation) and EPICLON (registered trademark) 830 (manufactured by DIC Corporation).
- Examples of the phenol novolac type epoxy resin include EPICLON (registered trademark) N-740, N-770, N-775 (above, manufactured by DIC Corporation), jER (registered trademark) 152, 154 (above, Mitsubishi Chemical Corporation).
- cresol novolak type epoxy resin examples include EPICLON (registered trademark) N-660, N-665, N-670, N-673, N-680, N-695, and N-665-EXP. N-672-EXP (above, manufactured by DIC Corporation) and the like.
- examples of the glycidylamine type epoxy resin include EPICLON (registered trademark) 430, 430-L (above, manufactured by DIC Corporation), TETRAD (registered trademark) -C, TETRAD (registered trademark) -X (above, Mitsubishi).
- hydroxymethyl group-substituted phenol compound examples include 2-hydroxymethyl-4,6-dimethylphenol, 1,3,5-trihydroxymethylbenzene, 3,5-dihydroxymethyl-4-methoxytoluene [2,6 -Bis (hydroxymethyl) -p-cresol] and the like.
- Examples of the compound having an alkoxyalkylated amino group include, for example, (poly) methylolated melamine, (poly) methylolated glycoluril, (poly) methylolated benzoguanamine, (poly) methylolated urea, And a nitrogen-containing compound having a plurality of active methylol groups, wherein at least one hydrogen atom of the hydroxyl group of the methylol group is substituted with an alkyl group such as a methyl group or a butyl group.
- the alkoxyalkylated amino group-containing compound may be a mixture of a plurality of substituted compounds, and there is also a mixture containing an oligomer component that is partially self-condensed, and such a mixture is also used. be able to. More specifically, for example, hexamethoxymethyl melamine (manufactured by Nippon Cytec Industries, Ltd., CYMEL (registered trademark) 303), tetrabutoxymethyl glycoluril (manufactured by Nippon Cytec Industries, Ltd., CYMEL (registered trademark) 1170).
- CYMEL series products such as tetramethoxymethylbenzoguanamine (CYCEL (registered trademark) 1123, manufactured by Nippon Cytec Industries Co., Ltd.), methylated melamine resin (manufactured by Sanwa Chemical Co., Ltd., Nicalac (registered trademark) MW-30HM, MW-390, MW-100LM, MX-750LM), methylated urea resin (manufactured by Sanwa Chemical Co., Ltd., Nicalac (registered trademark) MX-270, MX-280, MX-290), etc. List the products of the Nicarak series It can be.
- CYCEL registered trademark
- methylated melamine resin manufactured by Sanwa Chemical Co., Ltd., Nicalac (registered trademark) MW-30HM, MW-390, MW-100LM, MX-750LM
- methylated urea resin manufactured by Sanwa Chemical Co., Ltd., Nicalac (registered trademark
- the content of the component (C) in the microlens photosensitive resin composition of the present invention is usually 1 to 50% by mass based on the content in the solid content of the microlens photosensitive resin composition.
- the method for preparing the photosensitive resin composition for microlens of the present invention is not particularly limited.
- the copolymer (A) component is dissolved in a solvent, and the solution (B) component photosensitive agent and If necessary, there may be mentioned a method in which the crosslinking agent as component (C) is mixed in a predetermined ratio to obtain a uniform solution.
- the crosslinking agent as component (C) is mixed in a predetermined ratio to obtain a uniform solution.
- other additives are further added and mixed as necessary.
- the solvent is not particularly limited as long as it dissolves the components (A), (B), and (C).
- solvents include ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, methyl cellosolve acetate, ethyl cellosolve acetate, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, propylene glycol, propylene glycol monomethyl ether, propylene glycol monomethyl ether acetate.
- solvents can be used alone or in combination of two or more.
- propylene glycol monomethyl ether propylene glycol monomethyl ether acetate, 2-heptanone, ethyl lactate, butyl lactate and cyclohexanone are preferable from the viewpoint of improving the leveling property of the coating film.
- the photosensitive resin composition for microlenses of this invention can also contain surfactant for the purpose of improving applicability
- the surfactant include polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, polyoxyethylene cetyl ether, polyoxyethylene alkyl ethers such as polyoxyethylene oleyl ether, polyoxyethylene octylphenol ether, polyoxyethylene Polyoxyethylene alkyl aryl ethers such as nonylphenol ether, polyoxyethylene / polyoxypropylene block copolymers, sorbitan monolaurate, sorbitan monopalmitate, sorbitan monostearate, sorbitan monooleate, sorbitan trioleate, sorbitan tristearate Sorbitan fatty acid esters such as rate, polyoxyethylene sorbitan monolaurate, polyoxyethylene Non-ionic surfactants such as polyoxyethylene sorbitan fatty acid esters such as sorbitan monopalmitate, polyoxyethylene
- the above surfactants can be used alone or in combination of two or more.
- content in the photosensitive resin composition for microlenses of this invention is 3 mass based on content in solid content of the said photosensitive resin composition for microlenses. % Or less, preferably 1% by mass or less, and more preferably 0.5% by mass or less.
- the photosensitive resin composition for microlens of the present invention is a curing aid, an ultraviolet absorber, a sensitizer, a plasticizer, an antioxidant, an adhesion as long as the effects of the present invention are not impaired.
- Additives such as auxiliaries can be included.
- Substrate for example, a semiconductor substrate such as silicon covered with a silicon oxide film, a semiconductor substrate such as silicon covered with a silicon nitride film or a silicon oxynitride film, a silicon nitride substrate, a quartz substrate, a glass substrate (non-alkali glass, low (Including alkali glass and crystallized glass), and a glass substrate on which an ITO film is formed ⁇ .
- the photosensitive resin composition for microlens of the present invention is applied by an appropriate application method such as a spinner or a coater.
- a coating film is formed by pre-baking using a heating means such as a plate.
- the pre-bake conditions are appropriately selected from a baking temperature of 80 to 250 ° C. and a baking time of 0.3 to 60 minutes, preferably a baking temperature of 80 to 150 ° C. and a baking time of 0.5 to 5 minutes.
- the film thickness of the film formed from the photosensitive resin composition for microlenses of the present invention is 0.005 to 3.0 ⁇ m, preferably 0.01 to 1.0 ⁇ m.
- exposure is performed through a mask (reticle) for forming a predetermined pattern on the film obtained above.
- a mask for forming a predetermined pattern on the film obtained above.
- ultraviolet rays such as g-line and i-line, and far-infrared rays such as KrF excimer laser can be used.
- post-exposure heating Post Exposure Bake
- the conditions for the post-exposure heating are appropriately selected from heating temperatures of 80 to 150 ° C. and heating times of 0.3 to 60 minutes. Then, it is developed with an alkaline developer.
- alkaline developer examples include aqueous solutions of alkali metal hydroxides such as potassium hydroxide and sodium hydroxide, aqueous solutions of quaternary ammonium hydroxides such as tetramethylammonium hydroxide, tetraethylammonium hydroxide and choline, and ethanolamine. And alkaline aqueous solutions such as amine aqueous solutions such as propylamine and ethylenediamine. Further, a surfactant can be added to these developers.
- alkali metal hydroxides such as potassium hydroxide and sodium hydroxide
- quaternary ammonium hydroxides such as tetramethylammonium hydroxide, tetraethylammonium hydroxide and choline
- alkaline aqueous solutions such as amine aqueous solutions such as propylamine and ethylenediamine.
- a surfactant can be added to these developers.
- the development conditions are appropriately selected from a development temperature of 5 to 50 ° C. and a development time of 10 to 300 seconds.
- the film formed from the photosensitive resin composition for microlenses of the present invention can be easily developed at room temperature using an aqueous tetramethylammonium hydroxide solution. After development, for example, rinsing is performed using ultrapure water.
- the entire surface of the substrate is exposed using ultraviolet rays such as g-line and i-line or far infrared rays such as KrF excimer laser.
- post baking is performed using a heating means such as a hot plate.
- the post-baking conditions are appropriately selected from a baking temperature of 100 to 250 ° C. and a baking time of 0.5 to 60 minutes.
- the reaction solution is cooled to room temperature, poured into a diethyl ether solvent to reprecipitate the polymer, dried under reduced pressure, and a polymer (copolymer) having three types of repeating structural units represented by the following formula (14) Got.
- the weight average molecular weight Mw of the obtained polymer was 4,900 (polystyrene conversion).
- the reaction solution is cooled to room temperature, poured into a diethyl ether solvent to reprecipitate the polymer, dried under reduced pressure, and a polymer (copolymer) having three types of repeating structural units represented by the following formula (15) Got.
- the weight average molecular weight Mw of the obtained polymer was 6,000 (polystyrene conversion).
- the reaction solution is cooled to room temperature, poured into a diethyl ether solvent to reprecipitate the polymer, dried under reduced pressure, and a polymer (copolymer) having three types of repeating structural units represented by the following formula (16) Got.
- the weight average molecular weight Mw of the obtained polymer was 3,500 (polystyrene conversion).
- the reaction solution was cooled to room temperature, poured into a diethyl ether solvent to reprecipitate the polymer, and dried under reduced pressure.
- the polymer (copolymer) which has three types of repeating structural units represented by this was obtained.
- the weight average molecular weight Mw of the obtained polymer was 5,400 (polystyrene conversion).
- Example 2 A photosensitive resin composition was prepared under the same conditions as in Example 1 except that 5 g of the polymer obtained in Synthesis Example 2 was used as the component (A).
- Example 3 A photosensitive resin composition was prepared under the same conditions as in Example 1 except that 5 g of the polymer obtained in Synthesis Example 3 was used as the component (A).
- Example 4 A photosensitive resin composition was prepared under the same conditions as in Example 1 except that 5 g of the polymer obtained in Synthesis Example 6 was used as the component (A).
- Example 5 5 g of the polymer as component (A) obtained in Synthesis Example 1, 1.5 g of P-200 (manufactured by Toyo Gosei Co., Ltd.) as the photosensitive agent as component (B), and as the crosslinking agent as component (C) 0.75 g of Celoxide (registered trademark) 2021P (manufactured by Daicel Chemical Industries, Ltd.) and 0.02 g of megafac (registered trademark) R-30 (manufactured by DIC Corporation) as a surfactant were mixed with propylene glycol monomethyl ether 34. 0.1 g and 14.6 g of ethyl lactate were dissolved in a solution. Then, it filtered using the polyethylene micro filter with the hole diameter of 0.20 micrometer, and prepared the photosensitive resin composition.
- Celoxide registered trademark
- 2021P manufactured by Daicel Chemical Industries, Ltd.
- megafac registered trademark
- R-30 manufactured by DIC Corporation
- Example 6 A photosensitive resin composition was prepared under the same conditions as in Example 5 except that 5 g of the polymer obtained in Synthesis Example 4 was used as the component (A).
- Example 7 A photosensitive resin composition was prepared under the same conditions as in Example 5 except that 5 g of the polymer obtained in Synthesis Example 5 was used as the component (A).
- 20 manufactured by Sigma Aldrich Japan Co., Ltd., weight average molecular weight Mw 20,000
- P-200 Toyo Gosei Co.
- the transmittance of this film at a wavelength of 400 nm was measured using an ultraviolet-visible spectrophotometer UV-2550 (manufactured by Shimadzu Corporation). Furthermore, after heating this film
- the film formed from the photosensitive resin composition for microlenses of the present invention had high heat resistance and was hardly colored even after being heated at 260 ° C.
- the transmittance of the film was 95%, but when heated at 260 ° C. for 5 minutes, The permeability of the membrane decreased to 78% or less.
- the transmittance of the film is usually required to be 90% or more, and it is desirable that the transmittance hardly changes even after heating, but Comparative Example 1 did not satisfy any of the requirements.
- TMAH tetramethylammonium hydroxide
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Abstract
Description
また、液晶ディスプレイ(LCD)、有機エレクトロルミネッセンスディスプレイ装置等のディスプレイ装置の絶縁膜の開発を目的に、インデンとマレイミドとN-置換マレイミドからなるアルカリ可溶性共重合体、1,2-ナフトキノンジアジド化合物、架橋剤を含有する感放射線性樹脂組成物を用いることを特徴とするディスプレイ装置の絶縁膜形成方法が提案されている(特許文献5)。
さらに、多官能(メタ)アクリレートとの相溶性に非常に優れ、また、アルカリ可溶性も良好であり、したがって、このような特徴が要求される各種用途に好適に用いることを目的に、無置換マレイミド由来の単量体構造単位、スチレン類由来の単量体構造単位、(メタ)アクリル酸由来の単量体構造を含有することを特徴とする、マレイミド系共重合体が提案されている(特許文献6)。
しかし、これら従来文献は、マイクロレンズ用感光性樹脂組成物としての用途の提供を目的とするものでなく、かつ、無置換マレイミド構造単位、及びエポキシ基又はブロックイソシアネート基を含む構造単位を有する共重合体のマイクロレンズ用感光性樹脂組成物への適用について具体的な手段及び効果は示唆されていない。
すなわち、第1観点として、
(A)成分、(B)成分及び溶剤を含有するマイクロレンズ用感光性樹脂組成物。
(A)成分:下記式(1)で表されるマレイミド構造単位及び下記式(2)で表される繰り返し構造単位を有する共重合体
(B)成分:感光剤
第2観点として、前記熱架橋性を有する1価の有機基は、エポキシ基又はブロックイソシアネート基を含むことを特徴とする第1観点に記載のマイクロレンズ用感光性樹脂組成物。
第3観点として、前記(A)成分が、さらに、下記式(3)、式(4)及び式(5)で表される繰り返し構造単位3種のうち少なくとも1種を有する共重合体である、第1観点又は第2観点に記載のマイクロレンズ用感光性樹脂組成物。
(前記式(4)中、Yはフェニル基、ナフチル基、アントラセニル基、ビフェニリル基又は炭素原子数1乃至8のアルコキシ基を表す。但し、該フェニル基、該ナフチル基、該アントラセニル基及び該ビフェニリル基は、水素原子の一部又は全てが炭素原子数1乃至10のアルキル基、ハロゲン原子、カルボキシル基、ヒドロキシル基、アミノ基又はニトロ基で置換されていても良い。)
第4観点として、更に(C)成分として架橋剤を含む第1観点乃至第3観点のいずれか一に記載のマイクロレンズ用感光性樹脂組成物。
第5観点として、前記重合体の重量平均分子量が1000乃至50000である、第1観点乃至第4観点のいずれか一に記載のマイクロレンズ用感光性樹脂組成物。
第6観点として、第1観点乃至第5観点のいずれか一に記載のマイクロレンズ用感光性樹脂組成物から得られる硬化膜。
第7観点として、第1観点乃至第5観点のいずれか一に記載のマイクロレンズ用感光性樹脂組成物から作製されるマイクロレンズ。
また、本発明のマイクロレンズ用感光性樹脂組成物から形成されたパターンも優れた耐熱性を有することが可能である。
以上より、本発明のマイクロレンズ用感光性樹脂組成物から形成される膜は、その形成工程、又は配線等の周辺装置の形成工程において、高温での加熱処理が行われる場合にマイクロレンズが着色し、レンズ形状が変形する可能性を著しく減少できる。また、マイクロレンズ形成後に電極、配線形成工程が行われる場合には、有機溶剤によるマイクロレンズの変形、剥離といった問題も著しく減少できる。
したがって、本発明のマイクロレンズ用感光性樹脂組成物は、マイクロレンズを形成する材料として好適である。
以下、各成分の詳細を説明する。
本発明のマイクロレンズ用感光性樹脂組成物から溶剤を除いた固形分は通常、1乃至50質量%である。
本発明の(A)成分は、下記式(1)で表されるマレイミド構造単位及び下記式(2)で表される繰り返し構造単位を有する共重合体である。
前記エポキシ基を含む有機基としては、非脂環式構造であっても脂環式構造を含んでいても良い。前記R2を、エポキシ基を含む有機基とした場合の繰り返し構造単位である式(2)の具体的な例としては、当該エポキシ基を含む有機基が、非脂環式構造であれば下記式(6)で表される繰り返し構造単位、脂環式構造であれば下記式(7)で表される繰り返し構造単位が挙げられる。
前記R2を、ブロックイソシアネート基を含む有機基とした場合の繰り返し構造単位である式(2)の具体的な例としては、下記式(8)で表される繰り返し構造単位、及び下記式(9)で表される繰り返し構造単位が挙げられ、ブロック剤の脱離温度の観点から下記式(8)で表される繰り返し構造単位が好ましい。
上記式(4)中、Yはフェニル基、ナフチル基、アントラセニル基、ビフェニリル基又は炭素原子数1乃至8のアルコキシ基を表す。但し、該フェニル基、該ナフチル基、該アントラセニル基及び該ビフェニリル基は、水素原子の一部又は全てが炭素原子数1乃至10のアルキル基、ハロゲン原子、カルボキシル基、ヒドロキシル基、アミノ基又はニトロ基で置換されていても良い。)
本発明の(B)成分である感光剤としては、感光成分として使用できる化合物であれば、特に限定されるものでないが、1,2-ナフトキノンジアジド化合物が好ましい。
前記1,2-ナフトキノンジアジド化合物としては、ヒドロキシル基を有する化合物であって、これらのヒドロキシル基のうち、10乃至100モル%、好ましくは20乃至95モル%が1,2-ナフトキノンジアジドスルホン酸エステル化された化合物を用いることができる。
これらの架橋剤は、単独で又は二種以上を組み合わせて用いることができる。
上記式(13)で表されるオキシラン構造を有する化合物の具体例としては、以下に示す市販品が挙げられるが、これらの例に限定されるわけではない。脂環式エポキシ樹脂としては、例えば、デナコール(登録商標)EX-252(ナガセケムッテクス(株)製)、EPICLON(登録商標)200、同400(以上DIC(株)製)、jER(登録商標)871、同872(以上、三菱化学(株)製)が挙げられる。ビスフェノールA型エポキシ樹脂としては、例えば、jER(登録商標)828、同834、同1001、同1004(以上、三菱化学(株)製)、EPICLON(登録商標)850、同860、同4055(以上、DIC(株)製)が挙げられる。ビスフェノールF型エポキシ樹脂としては、例えば、jER(登録商標)807(三菱化学(株)製)、EPICLON(登録商標)830(DIC(株)製)が挙げられる。フェノールノボラック型エポキシ樹脂としては、例えば、EPICLON(登録商標)N-740、同N-770、同N-775(以上、DIC(株)製)、jER(登録商標)152、同154(以上、三菱化学(株)製)が挙げられる。クレゾールノボラック型エポキシ樹脂としては、例えば、EPICLON(登録商標)N-660、同N-665、同N-670、同N-673、同N-680、同N-695、同N-665-EXP、同N-672-EXP(以上、DIC(株)製)等が挙げられる。グリシジルアミン型エポキシ樹脂としては、例えば、EPICLON(登録商標)430、同430-L(以上、DIC(株)製)、TETRAD(登録商標)-C、TETRAD(登録商標)-X(以上、三菱ガス化学(株)製)、jER(登録商標)604、同630(以上、三菱化学(株)製)、スミエポキシ(登録商標)ELM120、同ELM100、同ELM434、同ELM434HV(以上、住友化学(株)製)、エポトート(登録商標)YH-434、同YH-434L(以上、東都化成(株)製)が挙げられる。
そのような溶剤としては、例えば、エチレングリコールモノメチルエーテル、エチレングリコールモノエチルエーテル、メチルセロソルブアセテート、エチルセロソルブアセテート、ジエチレングリコールモノメチルエーテル、ジエチレングリコールモノエチルエーテル、プロピレングリコール、プロピレングリコールモノメチルエーテル、プロピレングリコールモノメチルエーテルアセテート、プロピレングリコールプロピルエーテルアセテート、プロピレングリコールモノブチルエーテル、プロピレングリコールモノブチルエーテルアセテート、トルエン、キシレン、メチルエチルケトン、シクロペンタノン、シクロヘキサノン、2-ヒドロキシプロピオン酸エチル、2-ヒドロキシ-2-メチルプロピオン酸エチル、エトキシ酢酸エチル、ヒドロキシ酢酸エチル、2-ヒドロキシ-3-メチルブタン酸メチル、3-メトキシプロピオン酸メチル、3-メトキシプロピオン酸エチル、3-エトキシプロピオン酸エチル、3-エトキシプロピオン酸メチル、ピルビン酸メチル、酢酸エチル、酢酸ブチル、乳酸エチル、乳酸ブチル、2-ヘプタノン、γ-ブチロラクトンを挙げることができる。
当該界面活性剤としては、例えば、ポリオキシエチレンラウリルエーテル、ポリオキシエチレンステアリルエーテル、ポリオキシエチレンセチルエーテル、ポリオキシエチレンオレイルエーテル等のポリオキシエチレンアルキルエーテル類、ポリオキシエチレンオクチルフェノールエーテル、ポリオキシエチレンノニルフェノールエーテル等のポリオキシエチレンアルキルアリールエーテル類、ポリオキシエチレン・ポリオキシプロピレンブロックコポリマー類、ソルビタンモノラウレート、ソルビタンモノパルミテート、ソルビタンモノステアレート、ソルビタンモノオレエート、ソルビタントリオレエート、ソルビタントリステアレート等のソルビタン脂肪酸エステル類、ポリオキシエチレンソルビタンモノラウレート、ポリオキシエチレンソルビタンモノパルミテート、ポリオキシエチレンソルビタンモノステアレート、ポリオキシエチレンソルビタントリオレエート、ポリオキシエチレンソルビタントリステアレート等のポリオキシエチレンソルビタン脂肪酸エステル類等のノニオン系界面活性剤、エフトップ(登録商標)EF301、同EF303、同EF352(以上、三菱マテリアル電子化成株式会社(旧(株)ジェムコ)製)、メガファック(登録商標)F171、同F173、同R30(以上、DIC(株)製)、フロラードFC430、同FC431(以上、住友スリーエム(株)製)、アサヒガード(登録商標)AG710、サーフロン(登録商標)S-382、同SC101、同SC102、同SC103、同SC104、同SC105、同SC106(旭硝子(株)製)、FTX-206D、FTX-212D、FTX-218、FTX-220D、FTX-230D、FTX-240D、FTX-212P、FTX-220P、FTX-228P、FTX-240G等フタージェントシリーズ((株)ネオス製)等のフッ素系界面活性剤、オルガノシロキサンポリマーKP341(信越化学工業(株)製)を挙げることができる。
さらに、これらの現像液に界面活性剤を加えることもできる。
〔下記合成例で得られたポリマーの重量平均分子量の測定〕
装置:日本分光(株)製GPCシステム
カラム:Shodex〔登録商標〕KL-804L及び803L
カラムオーブン:40℃
流量:1ml/分
溶離液:テトラヒドロフラン
<合成例1>
マレイミド15.0g、グリシジルメタクリレート22.0g、N-シクロヘキシルマレイミド23.7g、及び2,2’-アゾビス(イソ酪酸)ジメチル1.2gをプロピレングリコールモノメチルエーテル144.5gに溶解させた後、この溶液を、プロピレングリコールモノメチルエーテル41.3gを80℃に保持したフラスコ中に3時間かけて滴下した。滴下終了後、12時間反応させた。この反応溶液を室温に冷却後、ジエチルエーテル溶媒に投入してポリマーを再沈殿させ、減圧乾燥して、下記式(14)で表される3種の繰り返し構造単位を有するポリマー(共重合体)を得た。
得られたポリマーの重量平均分子量Mwは4,900(ポリスチレン換算)であった。
マレイミド2.0g、グリシジルメタクリレート5.86g、スチレン4.29g、及び2,2’-アゾビス(イソ酪酸)ジメチル0.6gをプロピレングリコールモノメチルエーテル29.8gに溶解させた後、この溶液を、プロピレングリコールモノメチルエーテル8.5gを80℃に保持したフラスコ中に3時間かけて滴下した。滴下終了後、12時間反応させた。この反応溶液を室温に冷却後、ジエチルエーテル溶媒に投入してポリマーを再沈殿させ、減圧乾燥して、下記式(15)で表される3種の繰り返し構造単位を有するポリマー(共重合体)を得た。
得られたポリマーの重量平均分子量Mwは6,000(ポリスチレン換算)であった。
マレイミド3.7g、3,4-エポキシシクロヘキシルメチルメタクリレート(サイクロマー(登録商標)M100(ダイセル化学工業(株)製))7.5g、N-シクロヘキシルマレイミド3.4g、及び2,2’-アゾビス(イソ酪酸)ジメチル0.3gをプロピレングリコールモノメチルエーテル34.7gに溶解させた後、この溶液を、プロピレングリコールモノメチルエーテル9.9gを100℃に保持したフラスコ中に3時間かけて滴下した。滴下終了後、12時間反応させた。この反応溶液を室温に冷却後、ジエチルエーテル溶媒に投入してポリマーを再沈殿させ、減圧乾燥して、下記式(16)で表される3種の繰り返し構造単位を有するポリマー(共重合体)を得た。
得られたポリマーの重量平均分子量Mwは3,500(ポリスチレン換算)であった。
マレイミド12.0g、グリシジルメタクリレート8.4g、2-ビニルナフタレン17.2g、及び2,2’-アゾビス(イソ酪酸)ジメチル2.0gをプロピレングリコールモノメチルエーテル92.5gに溶解させた後、この溶液を、プロピレングリコールモノメチルエーテル26.4gを80℃に保持したフラスコ中に3時間かけて滴下した。滴下終了後、12時間反応させた。この反応溶液を室温に冷却後、メタノール溶媒に投入してポリマーを再沈殿させ、減圧乾燥して、下記式(17)で表される3種の繰り返し構造単位を有するポリマー(共重合体)を得た。
得られたポリマーの重量平均分子量Mwは9,500(ポリスチレン換算)であった。
マレイミド10.0g、グリシジルメタクリレート7.0g、4-tert-ブチルスチレン14.9g、及び2,2’-アゾビス(イソ酪酸)ジメチル1.7gをプロピレングリコールモノメチルエーテル78.4gに溶解させた後、この溶液を、プロピレングリコールモノメチルエーテル22.4gを80℃に保持したフラスコ中に3時間かけて滴下した。滴下終了後、12時間反応させた。この反応溶液を室温に冷却後、純水に投入してポリマーを再沈殿させ、減圧乾燥して、下記式(18)で表される3種の繰り返し構造単位を有するポリマー(共重合体)を得た。
得られたポリマーの重量平均分子量Mwは15,500(ポリスチレン換算)であった。
マレイミド3.0g、2-(O-[1’-メチルプロピリデンアミノ]カルボキシアミノ)エチルメタクリレート(カレンズMOI-BM(登録商標)(昭和電工(株)製)5.6g、N-シクロヘキシルマレイミド4.2g、及び2,2’-アゾビス(イソ酪酸)ジメチル0.3gをプロピレングリコールモノメチルエーテル30.4gに溶解させた後、この溶液を、プロピレングリコールモノメチルエーテル8.7gを80℃に保持したフラスコ中に3時間かけて滴下した。滴下終了後、12時間反応させた。この反応溶液を室温に冷却後、ジエチルエーテル溶媒に投入してポリマーを再沈殿させ、減圧乾燥して、下記式(19)で表される3種の繰り返し構造単位を有するポリマー(共重合体)を得た。
得られたポリマーの重量平均分子量Mwは5,400(ポリスチレン換算)であった。
<実施例1>
合成例1で得られた(A)成分であるポリマー5g、(B)成分である感光剤としてP-200(東洋合成工業(株)製)1.5g、及び界面活性剤としてメガファックR-30(DIC(株)製)0.02gを、プロピレングリコールモノメチルエーテル28.6g及び乳酸エチル13.1gに溶解させ溶液とした。その後、孔径0.20μmのポリエチレン製ミクロフィルターを用いてろ過して、感光性樹脂組成物を調製した。
(A)成分として合成例2で得られたポリマー5gを用いた以外は上記実施例1と同じ条件で、感光性樹脂組成物を調製した。
(A)成分として合成例3で得られたポリマー5gを用いた以外は上記実施例1と同じ条件で、感光性樹脂組成物を調製した。
(A)成分として合成例6で得られたポリマー5gを用いた以外は上記実施例1と同じ条件で、感光性樹脂組成物を調製した。
合成例1で得られた(A)成分であるポリマー5g、(B)成分である感光剤としてP-200(東洋合成工業(株)製)1.5g、(C)成分である架橋剤としてセロキサイド(登録商標)2021P(ダイセル化学工業(株)製)0.75g、及び界面活性剤としてメガファック(登録商標)R-30(DIC(株)製)0.02gを、プロピレングリコールモノメチルエーテル34.1g及び乳酸エチル14.6gに溶解させ溶液とした。その後、孔径0.20μmのポリエチレン製ミクロフィルターを用いてろ過して、感光性樹脂組成物を調製した。
(A)成分として合成例4で得られたポリマー5gを用いた以外は、上記実施例5と同じ条件で、感光性樹脂組成物を調製した。
(A)成分として合成例5で得られたポリマー5gを用いた以外は、上記実施例5と同じ条件で、感光性樹脂組成物を調製した。
下記式(20)で表される繰り返し構造単位を有するポリ(4-ビニルフェノール)(シグマアルドリッチジャパン(株)製、重量平均分子量Mw20,000)9g、感光剤としてP-200(東洋合成工業(株)製)2.7g、架橋剤としてCYMEL(登録商標)303(日本サイテックインダストリーズ(株))1.4g、及び界面活性剤としてメガファック(登録商標)R-30(DIC(株)製)0.03gを、プロピレングリコールモノメチルエーテル46.0g及び乳酸エチル19.7gに溶解させ溶液とした。その後、孔径0.10μmのポリエチレン製ミクロフィルターを用いてろ過して感光性樹脂組成物を調製した。
実施例1乃至実施例7及び比較例1で調製した感光性樹脂組成物をそれぞれ、石英基板上にスピンコーターを用いて塗布し、ホットプレート上において100℃で3分間プリベークした。次いで、紫外線照射装置PLA-501(F)(キャノン(株)製)により、365nmにおける照射量が500mJ/cm2の紫外線を全面照射した(フォトブリーチング)。次いで、ホットプレート上において200℃で5分間ポストベークを行い、膜厚600nmの膜を形成した。この膜を紫外線可視分光光度計UV-2550((株)島津製作所製)を用いて波長400nmの透過率を測定した。さらにこの膜を260℃で5分間加熱した後、波長400nmの透過率を測定した。評価の結果を表1に示す。
実施例1乃至実施例7で調製した感光性樹脂組成物をそれぞれ、シリコンウエハー上にスピンコーターを用いて塗布し、ホットプレート上において100℃で90秒間プリベークして、膜厚600nmの感光性樹脂膜を形成した。次いで、i線ステッパーNSR-2205i12D(NA=0.63)((株)ニコン製)を用いて、マスクを介して露光した。次いで、ホットプレート上において、100℃で90秒間露光後ベーク(PEB)し、水酸化テトラメチルアンモニウム(TMAH)水溶液(実施例1乃至実施例5で調製した感光性樹脂組成物を用いた場合は0.4質量%、実施例6、7及び比較例1で調製した感光性樹脂組成物を用いた場合は1.0質量%)で60秒間現像し、超純水で20秒間リンス、乾燥して1.4μm×1.4μmのドットパターンを形成した。さらに、前記i線ステッパーを用いて、500mJ/cm2のi線を全面照射し(フォトブリーチング)、ホットプレート上において本ベーク(まず100℃~180℃の温度で5分間ベーク、その後180℃~200℃の温度に昇温して5分間ベーク)を行った。さらに、この膜を260℃で5分間加熱した。走査型電子顕微鏡S-4800((株)日立ハイテクノロジーズ製)を用いて、現像・リンス・乾燥後、上記本ベーク後及び260℃加熱後それぞれのパターンの観察を行った。実施例1乃至実施例7で調製したいずれの感光性樹脂組成物を用いた場合も本ベーク後に半球状のレンズが得られ、その後の260℃ベークによってもレンズ形状が変化しないことを確認した。
実施例1乃至実施例7で調製した感光性樹脂組成物をそれぞれ、シリコンウエハー上にスピンコーターを用いて塗布し、ホットプレート上において100℃で3分間プリベークした。次いで、紫外線照射装置PLA-501(F)(キャノン(株)製)により、365nmにおける照射量が500mJ/cm2の紫外線を全面照射した(フォトブリーチング)。次いで、ホットプレート上において200℃で5分間ポストベークを行い、膜厚600nmの膜を形成した。これらの膜を、アセトン、N-メチルピロリドン、2-プロパノール、及び2-ヘプタノンに、それぞれ23℃にて10分間浸漬した。実施例1乃至実施例7で調製したいずれの感光性樹脂組成物から形成された膜の場合も、上記各溶剤に浸漬前後での膜厚変化が5%以下であることを確認した。
Claims (7)
- 前記熱架橋性を有する1価の有機基はエポキシ基又はブロックイソシアネート基を含む、請求項1に記載のマイクロレンズ用感光性樹脂組成物。
- 前記(A)成分が、さらに、下記式(3)、式(4)及び式(5)で表される繰り返し構造単位3種のうち少なくとも1種を有する共重合体である、請求項1又は請求項2に記載のマイクロレンズ用感光性樹脂組成物。
(前記式(4)中、Yはフェニル基、ナフチル基、アントラセニル基、ビフェニリル基又は炭素原子数1乃至8のアルコキシ基を表す。但し、該フェニル基、該ナフチル基、該アントラセニル基及び該ビフェニリル基は、水素原子の一部又は全てが炭素原子数1乃至10のアルキル基、ハロゲン原子、カルボキシル基、ヒドロキシル基、アミノ基又はニトロ基で置換されていても良い。) - 更に(C)成分として架橋剤を含む請求項1乃至請求項3のいずれか一項に記載のマイクロレンズ用感光性樹脂組成物。
- 前記共重合体の重量平均分子量が1000乃至50000である、請求項1乃至請求項4のいずれか一項に記載のマイクロレンズ用感光性樹脂組成物。
- 請求項1乃至請求項5のいずれか一項に記載のマイクロレンズ用感光性樹脂組成物から得られる硬化膜。
- 請求項1乃至請求項5のいずれか一項に記載のマイクロレンズ用感光性樹脂組成物から作製されるマイクロレンズ。
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