WO2021246445A1 - ポジ型感光性樹脂組成物、及び有機el素子隔壁 - Google Patents
ポジ型感光性樹脂組成物、及び有機el素子隔壁 Download PDFInfo
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- WO2021246445A1 WO2021246445A1 PCT/JP2021/021033 JP2021021033W WO2021246445A1 WO 2021246445 A1 WO2021246445 A1 WO 2021246445A1 JP 2021021033 W JP2021021033 W JP 2021021033W WO 2021246445 A1 WO2021246445 A1 WO 2021246445A1
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- resin composition
- photosensitive resin
- positive photosensitive
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- 150000003440 styrenes Chemical class 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 230000005469 synchrotron radiation Effects 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- GSECCTDWEGTEBD-UHFFFAOYSA-N tert-butylperoxycyclohexane Chemical compound CC(C)(C)OOC1CCCCC1 GSECCTDWEGTEBD-UHFFFAOYSA-N 0.000 description 1
- 125000001973 tert-pentyl group Chemical group [H]C([H])([H])C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- 150000003512 tertiary amines Chemical class 0.000 description 1
- 229940073455 tetraethylammonium hydroxide Drugs 0.000 description 1
- LRGJRHZIDJQFCL-UHFFFAOYSA-M tetraethylazanium;hydroxide Chemical compound [OH-].CC[N+](CC)(CC)CC LRGJRHZIDJQFCL-UHFFFAOYSA-M 0.000 description 1
- LFQCEHFDDXELDD-UHFFFAOYSA-N tetramethyl orthosilicate Chemical compound CO[Si](OC)(OC)OC LFQCEHFDDXELDD-UHFFFAOYSA-N 0.000 description 1
- GTZCVFVGUGFEME-UHFFFAOYSA-N trans-aconitic acid Natural products OC(=O)CC(C(O)=O)=CC(O)=O GTZCVFVGUGFEME-UHFFFAOYSA-N 0.000 description 1
- LDHQCZJRKDOVOX-UHFFFAOYSA-N trans-crotonic acid Natural products CC=CC(O)=O LDHQCZJRKDOVOX-UHFFFAOYSA-N 0.000 description 1
- PJANXHGTPQOBST-VAWYXSNFSA-N trans-stilbene Chemical compound C=1C=CC=CC=1/C=C/C1=CC=CC=C1 PJANXHGTPQOBST-VAWYXSNFSA-N 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- ILWRPSCZWQJDMK-UHFFFAOYSA-N triethylazanium;chloride Chemical compound Cl.CCN(CC)CC ILWRPSCZWQJDMK-UHFFFAOYSA-N 0.000 description 1
- ITMCEJHCFYSIIV-UHFFFAOYSA-N triflic acid Chemical compound OS(=O)(=O)C(F)(F)F ITMCEJHCFYSIIV-UHFFFAOYSA-N 0.000 description 1
- 125000000025 triisopropylsilyl group Chemical group C(C)(C)[Si](C(C)C)(C(C)C)* 0.000 description 1
- FTVLMFQEYACZNP-UHFFFAOYSA-N trimethylsilyl trifluoromethanesulfonate Chemical compound C[Si](C)(C)OS(=O)(=O)C(F)(F)F FTVLMFQEYACZNP-UHFFFAOYSA-N 0.000 description 1
- AAAQKTZKLRYKHR-UHFFFAOYSA-N triphenylmethane Chemical compound C1=CC=CC=C1C(C=1C=CC=CC=1)C1=CC=CC=C1 AAAQKTZKLRYKHR-UHFFFAOYSA-N 0.000 description 1
- 239000012989 trithiocarbonate Substances 0.000 description 1
- HIZCIEIDIFGZSS-UHFFFAOYSA-L trithiocarbonate Chemical compound [S-]C([S-])=S HIZCIEIDIFGZSS-UHFFFAOYSA-L 0.000 description 1
- 229940005605 valeric acid Drugs 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Classifications
-
- 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
- C08F220/30—Esters containing oxygen in addition to the carboxy oxygen containing aromatic rings in the alcohol moiety
- C08F220/301—Esters containing oxygen in addition to the carboxy oxygen containing aromatic rings in the alcohol moiety and one oxygen in the alcohol moiety
-
- 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
- C08F220/30—Esters containing oxygen in addition to the carboxy oxygen containing aromatic rings in the alcohol moiety
- C08F220/302—Esters containing oxygen in addition to the carboxy oxygen containing aromatic rings in the alcohol moiety and two or more oxygen atoms in the alcohol moiety
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L33/00—Compositions of homopolymers or 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 of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- C08L33/04—Homopolymers or copolymers of esters
- C08L33/14—Homopolymers or copolymers of esters of esters containing halogen, nitrogen, sulfur, or oxygen atoms in addition to the carboxy oxygen
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins
- C08L63/04—Epoxynovolacs
-
- 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
-
- 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
-
- 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
- G03F7/039—Macromolecular compounds which are photodegradable, e.g. positive electron resists
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/02—Details
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/22—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers
Definitions
- the present invention relates to a positive photosensitive resin composition, and an organic EL element partition wall, an organic EL element insulating film, and an organic EL element using the same. More specifically, the present invention relates to a positive photosensitive resin composition containing a black colorant, and an organic EL element partition wall, an organic EL element insulating film, and an organic EL element using the same.
- a partition material is used at the interval portion of the coloring pattern in the display region or the edge of the peripheral portion of the display region in order to improve the display characteristics.
- OLED organic EL display
- a partition wall is first formed, and the pixels of the organic substance are formed between the partition walls.
- the partition walls are generally formed by photolithography using a photosensitive resin composition and have insulating properties. Specifically, the photosensitive resin composition is applied onto the substrate using a coating device, the volatile components are removed by means such as heating, and then exposed through a mask, and then, in the case of a negative type, the unexposed portion is exposed.
- the exposed portion is developed by removing it with a developing solution such as an alkaline aqueous solution, and the obtained pattern is heat-treated to form a partition wall (insulating film).
- a developing solution such as an alkaline aqueous solution
- an organic substance that emits light of three colors of red, green, and blue is formed between the partition walls by an inkjet method or the like to form pixels of an organic EL display device.
- the partition material has a light-shielding property by using a colorant for the purpose of increasing the contrast in the display device and improving the visibility.
- the photosensitive resin composition tends to have low sensitivity, and as a result, the exposure time may be long and the productivity may be lowered. Therefore, the photosensitive resin composition used for forming the partition wall material containing the colorant is required to have higher sensitivity.
- Patent Document 1 Japanese Unexamined Patent Publication No. 2001-281440 describes a positive radiation-sensitive resin composition containing an alkali-soluble resin and a quinonediazide compound as a radiation-sensitive resin composition exhibiting high light-shielding properties by heat treatment after exposure. The composition to which titanium black is added is described.
- Patent Document 2 Japanese Unexamined Patent Publication No. 2002-116536 describes carbon black in a radiation-sensitive resin composition containing [A] an alkali-soluble resin, [B] a 1,2-quinonediazide compound, and [C] a colorant. It describes a method of blackening a partition material using.
- Patent Document 3 Japanese Unexamined Patent Publication No. 2010-237310 describes a positive radiation-sensitive resin composition containing an alkali-soluble resin and a quinonediazide compound as a radiation-sensitive resin composition that exhibits light-shielding properties by heat treatment after exposure. The composition to which the heat-sensitive dye is added is described.
- the photosensitive resin composition used for forming the colored partition material it is necessary to use a considerable amount of a colorant in order to sufficiently enhance the light-shielding property of the cured film.
- a colorant such as the light radiated to the film of the photosensitive resin composition is absorbed by the colorant, so that the effective intensity of the radiation in the film is lowered and the photosensitive resin composition is photosensitive.
- the resin composition is not sufficiently exposed, and as a result, the pattern formability is deteriorated.
- a quinonediazide compound is widely used as a radiation-sensitive compound in a positive photosensitive resin composition containing a general binder resin.
- the quinone diazide compound When the quinone diazide compound is irradiated with radiation such as visible light, ultraviolet light, ⁇ -ray, and electron beam, it produces a carboxy group through the reaction shown in the following reaction formula 1.
- the exposed portion (coating) By generating a carboxy group, the exposed portion (coating) can be dissolved in an alkaline solution, and alkaline developability is exhibited.
- the quinonediazide compound does not sufficiently react at the bottom of the film, so that the alkali solubility at the bottom of the film is insufficient, resin residue is generated during development, and the pattern resolution is lowered. May occur.
- a positive photosensitive resin composition containing a large amount of a colorant it is required to further increase the optical density (OD value) of the cured film, but it is not desirable that the pattern resolution is lowered as a trade-off.
- An object of the present invention is to provide a highly sensitive photosensitive resin composition containing a black colorant capable of forming a pattern having a high resolution.
- the present inventor has prepared a positive photosensitive resin composition as an acrylic resin having a plurality of phenolic hydroxyl groups and at least a part of the plurality of phenolic hydroxyl groups protected by an acid-degradable group as a photoacid generator. It has been found that the carboxylic acid compound produced when the quinone diazide compound is irradiated with radiation can deprotect the acid-degradable group when the chemical amplification system contains the quinone diazide compound in combination. Based on such findings, the present inventor has realized a positive photosensitive composition capable of forming a pattern with high resolution even though it contains a black colorant.
- the present invention includes the following aspects.
- An acrylic resin (A) having a plurality of phenolic hydroxyl groups and having at least a part of the plurality of phenolic hydroxyl groups protected by an acid-degradable group.
- At least one black colorant (B) selected from the group consisting of black dyes and black pigments, and
- the acrylic resin (A) is the formula (3).
- R 1 is an alkyl group having 1 to 5 carbon atoms
- R 5 is the acid-degradable group
- r is an integer of 0 to 5.
- the acrylic resin (A) is the formula (2). It is a copolymer further having a structural unit represented by, and in the formula (2), R 2 and R 3 are independently hydrogen atoms, alkyl groups having 1 to 3 carbon atoms, completely or partially, respectively.
- R 4 is a hydrogen atom, a linear or cyclic alkyl group having 4 to 12 carbon atoms of 1 to 6 carbon atoms, or hydroxy
- Mold photosensitive resin composition [4] The positive photosensitive resin composition according to any one of [2] and [3], wherein the acrylic resin (A) contains 60 mol% to 100 mol% of the structural unit represented by the formula (3).
- the positive photosensitive resin composition according to any one of [1] to [4], which comprises 20 parts by mass to 50 parts by mass of the quinone diazide compound (C) based on a total of 100 parts by mass of the resin components.
- Positive photosensitive resin composition [7]
- the acid-decomposable group of the acrylic resin (A) is the formula (6).
- R 6 and R 7 are independently hydrogen atoms or linear or branched alkyl groups having 1 to 4 carbon atoms, respectively, and are R 8 is a straight-chain having 1 to 12 carbon atoms, branched or cyclic alkyl group, an aralkyl group, or an alkenyl group having 2 to 12 carbon atoms of 7 to 12 carbon atoms, the R 6 or R 7 One and R 8 may be bonded to form a ring structure having 3 to 10 ring members, and R 6 , R 7 and R 8 are halogen atoms selected from the group consisting of fluorine, chlorine, bromine and iodine.
- the resin (D) having an epoxy group and a phenolic hydroxyl group is a reaction product of a compound having at least two epoxy groups in one molecule and a hydroxybenzoic acid compound, and is of the formula (5).
- b is an integer of 1 to 5
- * is the residue of the compound having at least two epoxy groups in one molecule, excluding the epoxy group to be reacted.
- the positive photosensitive resin composition according to [12] which represents a bonding portion with a group.
- the positive photosensitive resin composition according to [13], wherein the compound having at least two epoxy groups in one molecule is a novolak type epoxy resin.
- alkali-soluble and “alkali aqueous solution-soluble” mean that the positive photosensitive resin composition or its components, or the film or cured film of the positive photosensitive resin composition is an alkaline aqueous solution, for example, 2.38 mass. It means that it can be dissolved in a% aqueous solution of tetramethylammonium hydroxide.
- the "alkali-soluble functional group” means a group that imparts such alkali solubility to a positive photosensitive resin composition or a component thereof, or a film or a cured film of a positive photosensitive resin composition. Examples of the alkali-soluble functional group include a phenolic hydroxyl group, a carboxy group, a sulfo group, a phosphoric acid group, an acid anhydride group, a mercapto group and the like.
- the "acid-degradable group” means a group that decomposes (deprotects) to generate an alkali-soluble functional group by heating as necessary in the presence of an acid.
- the "radical polymerizable functional group” refers to one or more ethylenically unsaturated groups.
- (meth) acrylic means acrylic or methacrylic
- (meth) acrylate means acrylate or methacrylate
- (meth) acryloyl means acryloyl or methacryloyl.
- the number average molecular weight (Mn) and the weight average molecular weight (Mw) of the resin or polymer mean standard polystyrene-equivalent values measured by gel permeation chromatography (GPC).
- the positive photosensitive resin composition of one embodiment has a plurality of phenolic hydroxyl groups, and an acrylic resin (A) in which at least a part of the plurality of phenolic hydroxyl groups is protected with an acid-degradable group, a black dye, and the like. It contains at least one black colorant (B) selected from the group consisting of black pigments and a quinonediazide compound (C) as a photoacid generator.
- the acrylic resin (A) is a (co) polymer of ⁇ -alkylacrylic acid ester, has a plurality of phenolic hydroxyl groups, and at least a part of the plurality of phenolic hydroxyl groups is protected by an acid-degradable group. It is not particularly limited as long as it is a thing.
- the phenolic hydroxyl group is an alkali-soluble functional group, and a part of the phenolic hydroxyl group is protected by an acid-decomposable group, so that the alkali solubility of the acrylic resin (A) before exposure is suppressed.
- the acrylic resin (A) has a phenolic hydroxyl group on the benzene ring pendant on the polymer main chain.
- the acrylic resin (A) has a higher alkali solubility than the novolak resin having the same hydroxyl value because the alkaline compound in the developing solution easily approaches the phenolic hydroxyl group. Therefore, the acrylic resin (A) has a large change in alkali solubility before and after exposure (before and after decomposition of the acid-degradable group), and as a result, the resolution of the pattern can be further improved.
- the acrylic resin (A) may have an alkali-soluble functional group other than the phenolic hydroxyl group, and the alkali-soluble functional group may be protected by an acid-degradable group like the phenolic hydroxyl group.
- the acid generated during exposure catalytically promotes the decomposition (deprotection) of acid-degradable groups to regenerate phenolic hydroxyl groups.
- post-exposure bake PEB
- the acrylic resin (A) may have an alkali-soluble functional group other than the phenolic hydroxyl group, for example, a carboxy group, a sulfo group, a phosphoric acid group, an acid anhydride group, a mercapto group and the like.
- the acrylic resin (A) can be used alone or in combination of two or more.
- the acrylic resin (A) may be a combination of two or more kinds of resins having different structural units of the polymer, acid-decomposable groups, protection rates of phenolic hydroxyl groups, or combinations thereof.
- the acrylic resin (A) can be obtained by protecting a part of the phenolic hydroxyl groups of the base acrylic resin (a) having a plurality of phenolic hydroxyl groups with an acid-degradable group.
- the acrylic resin (A) having a phenolic hydroxyl group protected by an acid-degradable group has a partial structure of Ar—OR, where Ar represents a phenol-derived aromatic ring and R represents an acid-degradable group. ..
- An acid-degradable group is a group that decomposes (deprotects) to produce an alkali-soluble functional group by heating as necessary in the presence of an acid.
- a tert-butyl group a 1,1-dimethyl-propyl group, a 1-methylcyclopentyl group, a 1-ethylcyclopentyl group, a 1-methylcyclohexyl group, a 1-ethylcyclohexyl group, a 1-methyladamantyl group.
- R 6 and R 7 are independently hydrogen atoms or alkyl groups having 1 to 4 carbon atoms (linear or branched), and R 8 has 1 carbon atom.
- alkyl group of to 12 (straight-chain, branched or cyclic), an aralkyl group, or an alkenyl group having 2 to 12 carbon atoms of 7 to 12 carbon atoms, and one and R 8 of R 6 or R 7 May form a ring structure having 3 to 10 ring members, even if R 6 , R 7 and R 8 are substituted with a halogen atom selected from the group consisting of fluorine, chlorine, bromine and iodine. Good.) Can be mentioned.
- the group represented by the formula (6) forms an acetal structure or a ketal structure together with an oxygen atom derived from a phenolic hydroxyl group.
- the acid-decomposable group is preferably a group represented by the formula (6).
- R 6 and R 7 are independent hydrogen atoms or alkyl groups having 1 to 4 carbon atoms (linear or branched), and R 8 is from the group consisting of fluorine, chlorine, bromine and iodine. It is more preferably an alkyl group (linear, branched or cyclic) having 1 to 12 carbon atoms, which may be substituted with a selected halogen atom. Examples of such an acid-degradable group include a 1-alkoxyalkyl group.
- Examples of the 1-alkoxyalkyl group include methoxymethyl group, 1-methoxyethyl group, 1-ethoxyethyl group, 1-n-propoxyethyl group, 1-n-butoxyethyl group, 1-isobutoxyethyl group, 1 Examples thereof include- (2-chloroethoxy) ethyl group, 1- (2-ethylhexyloxy) ethyl group, 1-cyclohexyloxyethyl group, and 1- (2-cyclohexylethoxy) ethyl group, 1-ethoxyethyl group and 1 The -n-propoxyethyl group is preferred.
- the acid-decomposable group a group represented by the formula (6) in which one of R 6 or R 7 and R 8 are bonded to form a ring structure having 3 to 10 ring members is also preferably used. can do.
- R 6 or R 7, which is not involved in the formation of the ring structure is preferably a hydrogen atom.
- Examples of such an acid-degradable group include a 2-tetrahydrofuranyl group and a 2-tetrahydropyranyl group, and a 2-tetrahydrofuranyl group is preferable.
- the phenolic hydroxyl group protection reaction can be carried out under known conditions using a general protective agent.
- the acrylic resin (A) is obtained by reacting the base acrylic resin (a) with a protective agent in a solvent-free solvent or a solvent such as toluene or hexane at a reaction temperature of ⁇ 20 to 50 ° C. in the presence of an acid or a base. Can be obtained.
- the protective agent a known protective agent capable of protecting the phenolic hydroxyl group can be used.
- the protective agent for example, isobutene can be used when the acid-degradable group is a tert-butyl group, and di-tert-butyl dicarbonate can be used when the acid-degradable group is a tert-butoxycarbonyl group.
- the acid-degradable group is a silyl group such as a trimethylsilyl group or a triethylsilyl group
- a silicon-containing chloride such as trimethylsilyl chloride or triethylsilyl chloride
- a silicon-containing triflate compound such as trimethylsilyltriflate or triethyltriflate
- the acid-degradable group is a methoxymethyl group, it is a chloromethyl methyl ether, when it is a 1-ethoxyethyl group, it is an ethyl vinyl ether, when it is a 1-n-propoxyethyl group, it is an n-propyl vinyl ether, and when it is a 2-tetrahydrofuranyl group.
- 2-tetrahydrofuranyl group 2,3-dihydrofuran, 2-tetrahydropyranyl group, 3,4-dihydro-2H-pyran and the like can be used.
- Examples of the acid include inorganic acids such as hydrochloric acid, sulfuric acid, nitric acid and perchloric acid, and organic acids such as methanesulfonic acid, trifluoromethanesulfonic acid, p-toluenesulfonic acid and benzenesulfonic acid. Salts of organic acids, such as pyridinium salts of p-toluenesulfonic acid, can also be used as the acid source.
- Examples of the base include inorganic hydroxides such as sodium hydroxide and potassium hydroxide, inorganic carbonates such as sodium carbonate, sodium hydrogencarbonate, potassium carbonate and cesium carbonate, metal hydrides such as sodium hydride, and pyridines. Examples thereof include amine compounds such as N, N-dimethyl-4-aminopyridine, imidazole, triethylamine and diisopropylethylamine.
- Acrylic resin (A) can also be obtained by polymerizing or copolymerizing other polymerizable monomers according to the above.
- the protection of the phenolic hydroxyl group of the polymerizable monomer having the phenolic hydroxyl group can be carried out in the same manner as the protection of the phenolic hydroxyl group of the base acrylic resin (a).
- the base acrylic resin (a) may have a radically polymerizable functional group.
- the base acrylic resin (a) has a (meth) acryloyloxy group, an allyl group or a methallyl group as a radically polymerizable functional group.
- the base acrylic resin (a) of the acrylic resin (A) is an alkaline aqueous solution-soluble copolymer (a1) of a polymerizable monomer having a phenolic hydroxyl group and another polymerizable monomer.
- the aqueous alkaline aqueous solution soluble copolymer (a1) has a plurality of phenolic hydroxyl groups.
- the acrylic resin (A) is obtained by protecting at least a part of a plurality of phenolic hydroxyl groups of the aqueous alkaline aqueous solution soluble copolymer (a1) with an acid-degradable group.
- the alkaline aqueous solution-soluble copolymer (a1) may further have an alkali-soluble functional group other than the phenolic hydroxyl group, for example, a carboxy group, a sulfo group, a phosphoric acid group, an acid anhydride group, or a mercapto group.
- the alkaline aqueous solution-soluble copolymer (a1) can be produced, for example, by radically polymerizing a polymerizable monomer having a phenolic hydroxyl group and another polymerizable monomer. After synthesizing a copolymer having no phenolic hydroxyl group by radical polymerization, the phenolic hydroxyl group may be introduced into the copolymer.
- the polymerizable monomer having a phenolic hydroxyl group include acrylic monomers such as 4-hydroxyphenyl (meth) acrylate, 3,5-dimethyl-4-hydroxybenzylacrylamide, and 4-hydroxyphenylacrylamide, and acrylic monomers.
- Examples thereof include 4-hydroxyphenylmaleimide, and an ⁇ -alkylacrylic acid ester having a phenolic hydroxyl group is preferable from the viewpoint of improving developability.
- Examples of other polymerizable monomers include polymerizable styrene derivatives such as styrene, vinyltoluene, ⁇ -methylstyrene, p-methylstyrene and p-ethylstyrene, acrylamide, acrylic nitrile, vinyl-n-butyl ether and the like.
- the alkaline aqueous solution soluble copolymer (a1) has one or more rings such as an alicyclic structure, an aromatic structure, a polycyclic structure, an inorganic ring structure and a heterocyclic structure. It is preferable to have a formula structure.
- R 1 is an alkyl group having 1 to 5 carbon atoms, and a is an integer of 1 to 5.
- R 1 is preferably a methyl group.
- a is preferably an integer of 1 to 3, and more preferably 1.
- 4-hydroxyphenyl methacrylate is particularly preferable.
- R 2 and R 3 are independently hydrogen atoms, alkyl groups having 1 to 3 carbon atoms, fully or partially fluorinated alkyl groups having 1 to 3 carbon atoms, or a halogen atom
- R 4 is a hydrogen atom, a linear or cyclic alkyl group having 4 to 12 carbon atoms, or hydroxy group, an alkyl group and the number of carbon atoms of 1 to 6 carbon atoms of 1 to 6 carbon atoms It is a phenyl group which may be substituted with at least one selected from the group consisting of 1 to 6 alkoxy groups.
- R 2 and R 3 are independently hydrogen atoms or alkyl groups having 1 to 3 carbon atoms.
- R 4 is substituted with at least one selected from the group consisting of cyclic alkyl group having 4 to 12 carbon atoms, or hydroxy group, an alkyl group and alkoxy group having 1 to 6 carbon atoms of 1 to 6 carbon atoms It is preferably a phenyl group which may be used, and more preferably a cyclic alkyl group having 4 to 12 carbon atoms or a phenyl group. Phenylmaleimide and cyclohexylmaleimide are particularly preferred as such other polymerizable monomers.
- the alkaline aqueous solution soluble copolymer (a1) is represented by the formula (1).
- R 1 is an alkyl group having 1 to 5 carbon atoms, and a is an integer of 1 to 5).
- Structural unit represented by and formula (2) (In the formula (2), R 2 and R 3 are independently hydrogen atoms, alkyl groups having 1 to 3 carbon atoms, and fully or partially fluorinated alkyl groups having 1 to 3 carbon atoms, respectively.
- R 4 is a hydrogen atom, a linear or cyclic alkyl group having 4 to 12 carbon atoms, or hydroxy group, an alkyl group and carbon atoms of 1 to 6 carbon atoms of 1 to 6 carbon atoms It is a phenyl group that may be substituted with at least one selected from the group consisting of an alkoxy group of the number 1 to 6.) It has a structural unit represented by.
- the polymerization initiator for producing the base acrylic resin (a) by radical polymerization is not limited to the following, but is 2,2'-azobisisobutyronitrile and 2,2'-azobis (2-methyl). Butyronitrile), dimethyl 2,2'-azobis (2-methylpropionate), 4,4'-azobis (4-cyanovalerian acid), 2,2'-azobis (2,4-dimethylvaleronitrile) (AVN) and other azo polymerization initiators, dicumyl peroxides, 2,5-dimethyl-2,5-di (tert-butylperoxy) hexanes, tert-butylcumyl peroxides, di-tert-butyl peroxides, Peroxide polymerization initiators such as 1,1,3,3-tetramethylbutylhydroperoxide and cumenehydroperoxide having a 10-hour half-life temperature of 100 to 170 ° C., or benzoyl peroxide, lauroyl
- the amount of the polymerization initiator used is generally 0.01 parts by mass or more, 0.05 parts by mass or more or 0.5 parts by mass or more, 40 parts by mass or less, 20 parts by mass with respect to 100 parts by mass of the total amount of the polymerizable monomer. It is preferably 1 part by mass or less or 15 parts by mass or less.
- a RAFT (Reversible Addition Fragmentation Transfer) agent may be used in combination with a polymerization initiator.
- the RAFT agent is not limited to the following, and thiocarbonylthio compounds such as dithioester, dithiocarbamate, trithiocarbonate, and xantate can be used.
- the RAFT agent can be used in the range of 0.005 to 20 parts by mass with respect to 100 parts by mass of the total amount of the polymerizable monomer, and is preferably used in the range of 0.01 to 10 parts by mass.
- the weight average molecular weight (Mw) of the base acrylic resin (a) can be 3000 to 80000, preferably 4000 to 70,000, and more preferably 5000 to 60,000.
- the number average molecular weight (Mn) can be 1000 to 30000, preferably 1500 to 25000, and more preferably 2000 to 20000.
- the polydispersity (Mw / Mn) can be 1.0 to 3.5, preferably 1.1 to 3.0, and more preferably 1.2 to 2.8.
- 10 mol% to 95 mol%, preferably 20 mol% to 80 mol%, more preferably 25 mol% to 70 mol% of the phenolic hydroxyl group of the acrylic resin (A) is protected by an acid degradable group.
- an acid degradable group has been done.
- a chemical amplification function is imparted to the photosensitive resin composition to achieve high sensitivity. Can be done.
- the proportion of phenolic hydroxyl groups protected by acid-degradable groups is calculated from the weight loss rate (%) of the acrylic resin (A) by a thermogravimetric differential thermal analyzer (TG / DTA).
- TG / DTA thermogravimetric differential thermal analyzer
- the acrylic resin (A) has a plurality of phenolic hydroxyl groups, and at least a part of the plurality of phenolic hydroxyl groups is protected by an acid-degradable group, and the ⁇ -alkylacrylic acid having a phenolic hydroxyl group has a plurality of phenolic hydroxyl groups.
- the latter acrylic resin (A) uses an alkaline aqueous solution-soluble copolymer (a1) of an ⁇ -alkylacrylic acid ester having a phenolic hydroxyl group and another polymerizable monomer as a base acrylic resin (a).
- the aqueous alkaline aqueous solution soluble copolymer (a1) has a plurality of phenolic hydroxyl groups, and at least a part of these phenolic hydroxyl groups is protected by an acid-degradable group.
- the acrylic resin (A) is represented by the formula (3).
- R 1 is an alkyl group having 1 to 5 carbon atoms
- R 5 is an acid-degradable group
- r is an integer of 0 to 5
- s is an integer of 0 to 5.
- r + s has a structural unit represented by an integer of 1 to 5
- the acrylic resin (A) has at least one structural unit in which s is an integer of 1 or more. ..
- Acid-decomposable group of R 5 in Formula (6) -CR 6 R 7 - OR 8 (6) It is preferable that the group is represented by, and in the formula (6), R 6 and R 7 are independently hydrogen atoms or alkyl groups having 1 to 4 carbon atoms (linear or branched). Yes, R 8 is an alkyl group with 1 to 12 carbon atoms (linear, branched or cyclic), an aralkyl group with 7 to 12 carbon atoms, or an alkenyl group with 2 to 12 carbon atoms, or R. It is more preferable that one of 6 or R 7 and R 8 are combined to form a ring structure having 3 to 10 ring members.
- R 6 , R 7 and R 8 may be substituted with a halogen atom selected from the group consisting of fluorine, chlorine, bromine and iodine.
- a halogen atom selected from the group consisting of fluorine, chlorine, bromine and iodine.
- Examples of such an acid-degradable group include a 1-alkoxyalkyl group.
- Examples of the 1-alkoxyalkyl group include methoxymethyl group, 1-methoxyethyl group, 1-ethoxyethyl group, 1-n-propoxyethyl group, 1-n-butoxyethyl group, 1-isobutoxyethyl group, 1 Examples thereof include- (2-chloroethoxy) ethyl group, 1- (2-ethylhexyloxy) ethyl group, 1-cyclohexyloxyethyl group, and 1- (2-cyclohexylethoxy) ethyl group, 1-ethoxyethyl group and 1 The -n-propoxyethyl group is preferred.
- Examples of the acid-degradable group in which one of R 6 or R 7 and R 8 are bonded to form a ring structure having 3 to 10 ring members include a 2-tetrahydrofuranyl group and a 2-tetrahydropyranyl group.
- a 2-tetrahydrofuranyl group is preferred.
- the acrylic resin (A) is the formula (2).
- R 2 and R 3 are independently hydrogen atoms, alkyl groups having 1 to 3 carbon atoms, and fully or partially fluorinated alkyl groups having 1 to 3 carbon atoms, respectively. or halogen atom
- R 4 is a hydrogen atom, a linear or cyclic alkyl group having 4 to 12 carbon atoms, or hydroxy group, an alkyl group and carbon atoms of 1 to 6 carbon atoms of 1 to 6 carbon atoms It is a phenyl group that may be substituted with at least one selected from the group consisting of the number 1 to 6 alkoxy groups.) It is preferable to further have a structural unit represented by ().
- R 2 and R 3 are independently hydrogen atoms or alkyl groups having 1 to 3 carbon atoms.
- R 4 is substituted with at least one selected from the group consisting of cyclic alkyl group having 4 to 12 carbon atoms, or hydroxy group, an alkyl group and alkoxy group having 1 to 6 carbon atoms of 1 to 6 carbon atoms It is preferably a phenyl group which may be used.
- the acrylic resin (A) has a unit represented by the formula (3) of 60 mol% to 100 mol%, preferably 65 mol% to 100 mol%, and more preferably 70 mol% to 100 mol%. include. By setting the unit represented by the formula (3) to 60 mol% or more, sufficient alkali solubility can be exhibited in the acrylic resin (A). By setting the unit represented by the formula (3) to 100 mol% or less, the alkali solubility of the acrylic resin (A) can be adjusted within an appropriate range.
- the structural unit in which s is an integer of 1 or more, that is, at least one phenolic hydroxyl group is represented by the formula (3) protected by an acid-degradable group.
- the number of structural units is 5% to 95%, preferably 15% to 70%, and more preferably 20% to 60% of the total number of structural units of the acrylic resin (A).
- the positive photosensitive resin composition contains 10% by mass to 80% by mass, preferably 15% by mass to 60% by mass, more preferably the acrylic resin (A) based on 100% by mass of the solid content. Contains 20% by mass to 40% by mass.
- the content of the acrylic resin (A) is 10% by mass or more based on 100% by mass of the solid content, a chemical amplification function can be imparted to the photosensitive resin composition to realize high sensitivity.
- the content of the acrylic resin (A) is 80% by mass or less based on 100% by mass of the solid content, the residual amount of unreacted acid-decomposable groups is reduced, the solubility of the exposed portion is enhanced, and the sensitivity is high. Can be realized.
- the "solid content” refers to an acrylic resin (A), a black colorant (B), a quinonediazide compound (C), a resin (D) having an arbitrary epoxy group and a phenolic hydroxyl group, and a third resin (E). ),
- the positive photosensitive resin composition contains 15% by mass to 90% by mass, preferably 20% by mass to 80% by mass or 30% by mass of the acrylic resin (A) based on the total mass of the resin components. It contains from 90% by mass, more preferably 25% by mass to 65% by mass.
- the "resin component” means an acrylic resin (A), a resin (D) having an arbitrary epoxy group and a phenolic hydroxyl group, and an arbitrary third resin (E).
- the black colorant (B) is at least one selected from the group consisting of black dyes and black pigments.
- a black dye and a black pigment may be used in combination.
- a black partition wall on an organic EL element using a positive photosensitive resin composition containing a black colorant (B)
- the visibility of a display device such as an organic EL display can be improved.
- the black colorant (B) contains a black dye.
- a dye specified by the color index (CI) of Solvent Black 27 to 47 can be used.
- the black dye is preferably C.I. I. It is specified in. Solvent Black 27-47 C.I. I.
- the positive photosensitive resin composition containing a black dye has less residue of the black colorant (B) during development as compared with the positive photosensitive resin composition containing a black pigment, and forms a high-definition pattern on the film. can do.
- a black pigment may be used as the black colorant (B).
- the black pigment include carbon black, carbon nanotube, acetylene black, graphite, iron black, aniline black, titanium black, perylene pigment, lactam pigment and the like. Those having a surface treatment applied to these black pigments can also be used.
- Examples of commercially available perylene-based pigments include K0084 and K0086 manufactured by BASF, Pigment Black 21, 30, 31, 32, 33, 34 and the like.
- Examples of commercially available lactam pigments include Irgaphor® Black S0100CF manufactured by BASF. Since it has a high light-shielding property, the black pigment is preferably at least one selected from the group consisting of carbon black, titanium black, perylene-based pigments, and lactam-based pigments.
- the positive photosensitive resin composition contains 10 parts by mass to 150 parts by mass, preferably 30 parts by mass to 100 parts by mass of the black colorant (B) based on a total of 100 parts by mass of the resin components. More preferably, it contains 40 parts by mass to 70 parts by mass.
- the content of the black colorant (B) is 10 parts by mass or more based on the total of 100 parts by mass, the light-shielding property of the film after firing can be maintained.
- the content of the black colorant (B) is 150 parts by mass or less based on the total of 100 parts by mass, the coating film can be colored without impairing the alkali developability.
- the positive photosensitive resin composition contains a quinonediazide compound (C) as a photoacid generator.
- a quinonediazide compound (C) as a photoacid generator.
- radiation such as visible light, ultraviolet light, ⁇ -ray, and electron beam
- the generated carboxylic acid compound promotes the decomposition of the acid-degradable group of the acrylic resin (A) to regenerate the phenolic hydroxyl group and increase the alkali solubility of the acrylic resin (A).
- the quinonediazide compound interacts with a functional group of a binder resin such as a novolak resin (for example, hydrogen bond formation) before photosensitization to insolubilize the binder resin in an aqueous alkaline solution.
- a binder resin such as a novolak resin (for example, hydrogen bond formation)
- the presence of the alkali-soluble carboxylic acid compound in the irradiated portion makes it easier for the resin in that portion to dissolve in the alkaline aqueous solution together with the carboxylic acid compound.
- the carboxylic acid compound has a relatively larger molecular structure than acids generated from photoacid generators commonly used in chemically amplified resists, such as p-toluenesulfonic acid and 1-propanesulfonic acid, and diffuses in the coating.
- the quinone diazide compound (C) can be used alone or in combination of two or more.
- a high resolution pattern can be formed without performing post-exposure heat treatment (PEB) required for a general chemically amplified resist.
- the quinone diazide compound has a relatively high quantum yield, and the carboxylic acid compound is efficiently produced in the exposed portion.
- the generated carboxylic acid compound decomposes the acid-decomposable group even at room temperature to regenerate the phenolic hydroxyl group, and as a result, the unexposed portion and the exposed portion are exposed.
- the difference in alkali solubility of the part can be increased.
- PEB By omitting PEB, it is possible to suppress a decrease in pattern forming property due to excessive diffusion of the acid generated from the photoacid generator to the unexposed portion in a high temperature environment at the time of PEB. Further, when a resin (D) having an epoxy group and a phenolic hydroxyl group, which will be described later, is used as an optional component, ring-opening polymerization of the epoxy group of the epoxy group and the resin (D) having a phenolic hydroxyl group does not proceed if PEB is omitted. Therefore, the alkali solubility of the resin (D) having an epoxy group and a phenolic hydroxyl group can be maintained during development.
- the quinonediazide compound (C) includes a polyhydroxy compound in which quinonediazide sulfonic acid is ester-bonded, a polyamino compound in which quinonediazide sulfonic acid is conjugated with a sulfonamide, and a polyhydroxypolyamino compound in which quinonediazide sulfonic acid is ester-bonded or Examples thereof include those bonded with a sulfonamide. From the viewpoint of the contrast between the exposed portion and the unexposed portion, it is preferable that 20 mol% or more of the total functional group of the polyhydroxy compound or the polyamino compound is substituted with quinonediazide.
- polyhydroxy compound examples include Bis-Z, BisP-EZ, TekP-4HBPA, TrisP-HAP, TrisP-PA, TrisP-SA, TrisOCR-PA, BisOCHP-Z, BisP-MZ, BisP-PZ, and BisP-IPZ.
- BisOCP-IPZ BisP-CP, BisRS-2P, BisRS-3P, BisP-OCHP, Methyltris-FR-CR, BisRS-26X, DML-MBPC, DML-MBOC, DML-OCHP, DML-PCHP, DML- PC, DML-PTBP, DML-34X, DML-EP, DML-POP, Dimethylol-BisOC-P, DML-PFP, DML-PSBP, DML-MTrisPC, TriML-P, TriML-35XL, TML-BP, TML- HQ, TML-pp-BPF, TML-BPA, TMOM-BP, HML-TPPHBA, HML-TPHAP (trade name, manufactured by Honshu Chemical Industry Co., Ltd.), BIR-OC, BIP-PC, BIR-PC, BIR -PTBP, BIRO-PCHP, BIP-BIOC-F, 4PC, BIR-BIPC-F, TEP-BIP
- polyamino compound examples include 1,4-phenylenediamine, 1,3-phenylenediamine, 4,4'-diaminodiphenyl ether, 4,4'-diaminodiphenylmethane, 4,4'-diaminodiphenyl sulfone, and 4,4'-.
- examples thereof include, but are not limited to, diaminodiphenyl sulfide.
- polyhydroxypolyamino compound examples include, but are not limited to, 2,2-bis (3-amino-4-hydroxyphenyl) hexafluoropropane, 3,3'-dihydroxybenzidine and the like.
- the quinone diazide compound (C) is preferably a 1,2-naphthoquinone diazide-4-sulfonic acid ester or a 1,2-naphthoquinone diazide-5-sulfonic acid ester of a polyhydroxy compound.
- the positive photosensitive resin composition contains 5 parts by mass to 50 parts by mass, preferably 10 parts by mass to 45 parts by mass or 20 parts by mass of the quinonediazide compound (C) based on a total of 100 parts by mass of the resin components. It contains 50 parts by mass, more preferably 13 parts by mass to 40 parts by mass.
- the content of the quinone diazide compound (C) is 5 parts by mass or more based on the total of 100 parts by mass, high sensitivity can be realized.
- the content of the quinone diazide compound (C) is 50 parts by mass or less based on the total of 100 parts by mass, the alkali developability is good.
- the positive photosensitive resin composition contains, as a photoacid generator other than the quinonediazide compound (C), for example, an onium salt such as a trichloromethyl-s-triazine compound, a sulfonium salt, a phosphonium salt, a diazonium salt, an iodonium salt, and a fourth. It may contain a lower ammonium salt, a diazomethane compound, an imide sulfonate compound, or an oxime sulfonate compound.
- an onium salt such as a trichloromethyl-s-triazine compound, a sulfonium salt, a phosphonium salt, a diazonium salt, an iodonium salt, and a fourth. It may contain a lower ammonium salt, a diazomethane compound, an imide sulfonate compound, or an oxime sulfonate compound.
- the content of the photoacid generator other than the quinonediazide compound (C) in the positive photosensitive resin composition is preferably 0.5 parts by mass or less based on 100 parts by mass of the total of the resin components. Is 0.3 parts by mass or less, more preferably 0.1 parts by mass or less.
- the positive photosensitive resin composition preferably does not contain a photoacid generator other than the quinonediazide compound (C).
- the positive photosensitive resin composition may further contain a resin (D) having an epoxy group and a phenolic hydroxyl group.
- the resin (D) having an epoxy group and a phenolic hydroxyl group is an alkaline aqueous solution soluble resin.
- the resin (D) having an epoxy group and a phenolic hydroxyl group may have an alkali-soluble functional group other than the phenolic hydroxyl group. Phenolic hydroxyl groups and other alkali-soluble functional groups may be protected by acid-degradable groups.
- the resin (D) having an epoxy group and a phenolic hydroxyl group is, for example, a part of the epoxy group of a compound having at least two epoxy groups in one molecule (hereinafter, may be referred to as “epoxy compound”). It can be obtained by reacting with the carboxy group of the hydroxyepoxide compound.
- the epoxy group of the resin (D) having an epoxy group and a phenolic hydroxyl group forms a crosslink by reacting with the phenolic hydroxyl group during heat treatment (post-baking) after development, whereby the chemical resistance and heat resistance of the coating film are formed. Can be improved.
- the acid-degradable group of the resin (D) having the epoxy group and the phenolic hydroxyl group is sufficiently decomposed (deprotected) when exposed at a low exposure amount.
- reaction formula 2 shows an example of a reaction in which one of the epoxy groups of the epoxy compound reacts with the carboxy group of the hydroxybenzoic acid compound to form a compound having a phenolic hydroxyl group.
- Examples of the compound having at least two epoxy groups in one molecule include novolak type epoxy resins such as phenol novolac type epoxy resin and cresol novolac type epoxy resin, bisphenol type epoxy resin, biphenol type epoxy resin, and naphthalene skeleton-containing epoxy resin. , Alicyclic epoxy resin, heterocyclic epoxy resin and the like can be mentioned. These epoxy compounds may have two or more epoxy groups in one molecule, and may be used alone or in combination of two or more. Since these compounds are thermosetting, it is not possible to unambiguously describe their structures due to differences in the presence or absence of epoxy groups, the types of functional groups, the degree of polymerization, etc., as is common knowledge of those skilled in the art.
- R 9 is a hydrogen atom, an alkyl group having 1 to 5 carbon atoms, an alkoxy group or a hydroxyl group having 1 to 2 carbon atoms, and m is an integer of 1 to 50.
- Examples of the phenol novolac type epoxy resin include EPRICLON (registered trademark) N-770 (manufactured by DIC Corporation) and jER (registered trademark) -152 (manufactured by Mitsubishi Chemical Corporation).
- Examples of the cresol novolac type epoxy resin include EPICLON (registered trademark) N-695 (manufactured by DIC Corporation) and EOCN (registered trademark) -102S (manufactured by Nippon Kayaku Co., Ltd.).
- Examples of the bisphenol type epoxy resin include bisphenol A type such as jER (registered trademark) 828, jER (registered trademark) 1001 (manufactured by Mitsubishi Chemical Corporation), and YD-128 (trade name, manufactured by Nittetsu Chemical & Materials Co., Ltd.).
- Examples thereof include epoxy resins, bisphenol F type epoxy resins such as jER (registered trademark) 806 (manufactured by Mitsubishi Chemical Co., Ltd.) and YDF-170 (trade name, manufactured by Nittetsu Chemical & Materials Co., Ltd.).
- Examples of the biphenol type epoxy resin include jER (registered trademark) YX-4000 and jER (registered trademark) YL-6121H (manufactured by Mitsubishi Chemical Corporation).
- Examples of the naphthalene skeleton-containing epoxy resin include NC-7000 (trade name, manufactured by Nippon Kayaku Co., Ltd.), EXA-4750 (trade name, manufactured by DIC Corporation) and the like.
- Examples of the alicyclic epoxy resin include EHPE (registered trademark) -3150 (manufactured by Daicel Chemical Industries, Ltd.).
- Examples of the heterocyclic epoxy resin include TEPIC (registered trademark), TEPIC-L, TEPIC-H, TEPIC-S (manufactured by Nissan Chemical Industries, Ltd.) and the like.
- the compound having at least two epoxy groups in one molecule is preferably a novolak type epoxy resin, and more preferably at least one selected from the group consisting of a phenol novolac type epoxy resin and a cresol novolac type epoxy resin.
- the positive photosensitive resin composition containing an epoxy group derived from a novolak type epoxy resin and a resin (D) having a phenolic hydroxyl group has excellent pattern forming property, easy adjustment of alkali solubility, and outgassing. few.
- the hydroxybenzoic acid compound is a compound in which at least one of the 2 to 6 positions of benzoic acid is substituted with a hydroxyl group, for example, salicylic acid, 4-hydroxybenzoic acid, 2,3-dihydroxybenzoic acid, 2,4-dihydroxybenzoic acid. , 2,5-Dihydroxybenzoic acid, 2,6-dihydroxybenzoic acid, 3,4-dihydroxybenzoic acid, 3,5-dihydroxybenzoic acid, 2-hydroxy-5-nitrobenzoic acid, 3-hydroxy-4-nitro Examples thereof include benzoic acid and 4-hydroxy-3-nitrobenzoic acid, and a dihydroxybenzoic acid compound is preferable from the viewpoint of enhancing alkali developability.
- the hydroxybenzoic acid compound can be used alone or in combination of two or more.
- the resin (D) having an epoxy group and a phenolic hydroxyl group is a reaction product of a compound having at least two epoxy groups in one molecule and a hydroxybenzoic acid compound, and is of the formula (5).
- b is an integer of 1 to 5
- * represents the binding portion of the compound having at least two epoxy groups in one molecule to the residue excluding the epoxy group involved in the reaction.
- the resin (D) having an epoxy group and a phenolic hydroxyl group from the epoxy compound and the hydroxybenzoic acid compound 0.2 to 0.95 equivalent of the hydroxy benzoic acid compound is used with respect to 1 equivalent of the epoxy group of the epoxy compound. It can be used, preferably 0.3 to 0.9 equivalents, more preferably 0.4 to 0.8 equivalents.
- the hydroxybenzoic acid compound is 0.2 equivalent or more, sufficient alkali solubility can be obtained, and when it is 0.95 equivalent or less, the increase in molecular weight due to a side reaction can be suppressed.
- a catalyst may be used to accelerate the reaction between the epoxy compound and the hydroxybenzoic acid compound.
- the amount of the catalyst used can be 0.1 to 10 parts by mass based on 100 parts by mass of the reaction raw material mixture composed of the epoxy compound and the hydroxybenzoic acid compound.
- the reaction temperature can be 60 to 150 ° C. and the reaction time can be 3 to 30 hours.
- Examples of the catalyst used in this reaction include triethylamine, benzyldimethylamine, triethylammonium chloride, benzyltrimethylammonium bromide, benzyltrimethylammonium iodide, triphenylphosphine, chromium octanate, zirconium octanate and the like.
- the number average molecular weight (Mn) of the resin (D) having an epoxy group and a phenolic hydroxyl group is preferably 500 to 8000, more preferably 800 to 6000, and even more preferably 1000 to 5000.
- the alkali solubility is appropriate, so that it is good as a resin for a photosensitive material, and when it is 8000 or less, the coatability and developability are good.
- the epoxy equivalent of the resin (D) having an epoxy group and a phenolic hydroxyl group is 300 to 7000, preferably 400 to 6000, and more preferably 500 to 5000.
- the epoxy equivalent of the resin (D) having an epoxy group and a phenolic hydroxyl group is 300 or more, sufficient alkali solubility can be exhibited in the resin (D) having an epoxy group and a phenolic hydroxyl group.
- the epoxy equivalent of the resin (D) having an epoxy group and a phenolic hydroxyl group is 7,000 or less, the strength of the coating film after curing can be increased.
- the epoxy equivalent is determined by JIS K 7236: 2009.
- the hydroxyl group equivalent of the resin (D) having an epoxy group and a phenolic hydroxyl group is 160 to 500, preferably 170 to 400, and more preferably 180 to 300.
- the strength of the coating film after curing can be increased.
- the hydroxyl group equivalent of the resin (D) having an epoxy group and a phenolic hydroxyl group is 500 or less, sufficient alkali solubility can be imparted to the resin (D) having an epoxy group and a phenolic hydroxyl group.
- the hydroxyl group equivalent is determined by JIS K 0070: 1992.
- the positive photosensitive resin composition contains 5% by mass to 50% by mass, preferably 10% by mass or more of the resin (D) having an epoxy group and a phenolic hydroxyl group based on a solid content of 100% by mass. It contains 40% by mass, more preferably 15% by mass to 30% by mass.
- the content of the resin (D) having an epoxy group and a phenolic hydroxyl group is 5% by mass or more based on 100% by mass of the solid content, dissolution of the exposed portion can be promoted and high sensitivity can be realized. The stability and durability of the film after thermosetting can be ensured.
- the solubility of the unexposed portion is suppressed to a low level and the residual film ratio is kept high. Can be done.
- the positive photosensitive resin composition may further contain a third resin (E) other than the acrylic resin (A) and the resin (D) having an epoxy group and a phenolic hydroxyl group.
- the third resin (E) can be used alone or in combination of two or more.
- the third resin (E) for example, an acrylic resin other than the acrylic resin (A), a polystyrene resin, an epoxy resin, a polyamide resin, a phenol resin, a polyimide resin, a polyamic acid resin, a polybenzoxazole resin, and a polybenzoxazole resin precursor. , Silicone resin, cyclic olefin polymer, cardo resin, and derivatives of these resins.
- a derivative of a phenol resin a polyalkenylphenol resin in which an alkenyl group is bonded to a benzene ring
- a hydroxypolystyrene resin derivative in which a phenolic hydroxyl group and a hydroxyalkyl group or an alkoxy group are bonded to a benzene ring may be used.
- These resins may or may not have alkali-soluble functional groups.
- the third resin (E) is an acrylic resin having a plurality of phenolic hydroxyl groups, wherein the plurality of phenolic hydroxyl groups are not protected by an acid-degradable group, that is, in the acrylic resin (A). All acid-degradable groups are deprotected. Since such an acrylic resin has excellent compatibility with the acrylic resin (A) and has high alkali solubility, it can be suitably used for adjusting the alkali solubility of the coating film.
- the content of the third resin (E) can be appropriately determined within a range that does not impair the characteristics required for the use of the positive photosensitive resin composition.
- the positive photosensitive resin composition may further contain a dissolution accelerator (F) for improving the solubility of the alkali-soluble portion in the developer during development.
- a dissolution accelerator (F) for improving the solubility of the alkali-soluble portion in the developer during development.
- the dissolution accelerator (F) include organic low molecular weight compounds selected from the group consisting of a compound having a carboxy group and a compound having a phenolic hydroxyl group.
- the dissolution accelerator (F) can be used alone or in combination of two or more.
- the "low molecular weight compound” means a compound having a molecular weight of 1000 or less.
- the organic low molecular weight compound has a carboxy group or a plurality of phenolic hydroxyl groups and is alkali-soluble.
- organic low molecular weight compounds include aliphatic monocarboxylic acids such as formic acid, acetic acid, propionic acid, butyric acid, valeric acid, pivalic acid, caproic acid, diethylacetic acid, enanthic acid and capric acid; oxalic acid and malon. Acids, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, brassic acid, methylmalonic acid, ethylmalonic acid, dimethylmalonic acid, methylsuccinic acid, tetramethylsuccinic acid, citraconic acid, etc.
- aliphatic monocarboxylic acids such as formic acid, acetic acid, propionic acid, butyric acid, valeric acid, pivalic acid, caproic acid, diethylacetic acid, enanthic acid and capric acid
- oxalic acid and malon Acids, succ
- Aliphatic dicarboxylic acids such as aliphatic tricarboxylic acids such as tricarbaryl acid, aconitic acid, and camphoronic acid; aromatic monocarboxylic acids such as benzoic acid, toluic acid, cumic acid, hemmellitic acid, and mesitylic acid; phthalic acid, isophthalic acid, Aromatic polycarboxylic acids such as terephthalic acid, trimellitic acid, trimesic acid, merophanic acid, pyromellitic acid; aromatic hydroxycarboxylic acids such as dihydroxybenzoic acid, trihydroxybenzoic acid and gallic acid; phenylacetic acid, hydroatropic acid, hydrocay Other carboxylic acids such as dermal acid, mandelic acid, phenylsuccinic acid, atropic acid, silicic acid, methyl silicate, benzyl silicate, cinnamyldenacetic acid, kumalic acid, umbellic acid; catechol, resor
- the content of the dissolution accelerator (F) in the positive photosensitive resin composition can be 0.1 part by mass to 50 parts by mass, preferably 1 part by mass, based on 100 parts by mass of the total of the resin components. It is from 3 parts by mass to 35 parts by mass, and more preferably 2 parts by mass to 20 parts by mass. If the content of the dissolution accelerator (F) is 0.1 part by mass or more based on the total of 100 parts by mass, the dissolution of the resin component can be effectively promoted, and if it is 50 parts by mass or less. Excessive dissolution of the resin component can be suppressed, and the pattern forming property of the coating film, surface quality and the like can be improved.
- the positive photosensitive resin composition may contain a thermosetting agent, a surfactant, a colorant other than (B), or the like as an optional component (G).
- the optional component (G) is defined as not applicable to any of (A) to (F).
- thermosetting agent A thermal radical generator can be used as the thermosetting agent.
- Preferred thermal radical generators include organic peroxides, specifically dicumyl peroxide, 2,5-dimethyl-2,5-di (tert-butylperoxy) hexane, tert-butyl.
- the content of the thermosetting agent is preferably 5 parts by mass or less, more preferably 4 parts by mass or less, and further preferably 3 parts by mass or less, based on 100 parts by mass of the total solid content excluding the thermosetting agent. ..
- the positive photosensitive resin composition can contain a surfactant, for example, in order to improve the coatability, the smoothness of the coating film, or the developability of the coating film.
- a surfactant include polyoxyethylene alkyl ethers such as polyoxyethylene lauryl ether, polyoxyethylene stearyl ether, and polyoxyethylene oleyl ether; and poly such as polyoxyethylene octylphenyl ether and polyoxyethylene nonylphenyl ether.
- Oxyethylene aryl ethers Nonionic surfactants such as polyoxyethylene dialkyl esters such as polyoxyethylene dilaurate and polyoxyethylene distearate; Megafuck® F-251, F-281, F 430, F-444, R-40, F-553, F-554, F-555, F-556, F-557, F-558, F-559 (above, Product name, manufactured by DIC Co., Ltd., Surfron (registered trademark) S-242, S-243, S-386, S-420, S-611 (above, product name, manufactured by ACG Seimi Chemical Co., Ltd.) Fluorobased surfactants such as; organosiloxane polymers KP323, KP326, KP341 (above, trade name, manufactured by Shin-Etsu Chemical Industry Co., Ltd.) and the like can be mentioned. These surfactants can be used alone or in combination of two or more.
- the content of the surfactant is preferably 2 parts by mass or less, more preferably 1 part by mass or less, still more preferably 0.5 part by mass or less, based on 100 parts by mass of the total solid content excluding the surfactant. Is.
- the positive photosensitive resin composition can contain a second colorant other than the black colorant (B).
- the second colorant include dyes, organic pigments, inorganic pigments and the like, which can be used according to the purpose.
- the second colorant can be used in a content that does not impair the effects of the disclosure of the present invention.
- dyes examples include azo dyes, benzoquinone dyes, naphthoquinone dyes, anthraquinone dyes, cyanine dyes, squarylium dyes, croconium dyes, merocyanine dyes, stilben dyes, diphenylmethane dyes, and triphenylmethane dyes.
- dyes include dyes, fluorane dyes, spiropyran dyes, phthalocyanine dyes, indigo dyes, flugide dyes, nickel complex dyes, and azulene dyes.
- red dyes are preferable.
- red dyes for example, VALUESTA (registered trademark) RED 3312 (red dye specified by CI of Solvent Red 122, manufactured by Orient Chemical Industry Co., Ltd.) and VALUESTA (registered trademark) RED 3311 (solvent red 8).
- a red dye specified by CI, manufactured by Orient Chemical Industry Co., Ltd. can be mentioned.
- pigment for example, C.I. I. Pigment Yellow 20, 24, 86, 93, 109, 110, 117, 125, 137, 138, 147, 148, 153, 154, 166, C.I. I. Pigment Orange 36, 43, 51, 55, 59, 61, C.I. I. Pigment Red 9, 97, 122, 123, 149, 168, 177, 180, 192, 215, 216, 217, 220, 223, 224, 226, 227, 228, 240, C.I. I. Pigment Violet 19, 23, 29, 30, 37, 40, 50, C.I. I. Pigment Blue 15, 15: 1, 15: 4, 22, 60, 64, C.I. I. Pigment Green 7, C.I. I. Pigment Brown 23, 25, 26 and the like.
- the positive photosensitive resin composition can be dissolved in a solvent (H) and used as a coating composition in a solution state (however, when a black pigment is contained, the pigment is in a dispersed state).
- a black colorant a black colorant ( Positive-type photosensitive by mixing B), the quinonediazide compound (C), and optionally the optional component (G) such as a dissolution accelerator (F), a thermosetting agent, and a surfactant in a predetermined ratio.
- a coating composition of a resin composition can be prepared. The coating composition can be adjusted to a viscosity suitable for the coating method used by changing the amount of the solvent (H).
- Examples of the solvent (H) include glycol ethers such as ethylene glycol monomethyl ether, ethylene glycol dimethyl ether, ethylene glycol methyl ethyl ether and ethylene glycol monoethyl ether, ethylene glycol alkyl ether acetate such as methyl cellosolve acetate and ethyl cellosolve acetate, and diethylene glycol.
- glycol ethers such as ethylene glycol monomethyl ether, ethylene glycol dimethyl ether, ethylene glycol methyl ethyl ether and ethylene glycol monoethyl ether
- ethylene glycol alkyl ether acetate such as methyl cellosolve acetate and ethyl cellosolve acetate
- diethylene glycol diethylene glycol
- Diethylene glycol compounds such as monomethyl ether, diethylene glycol diethyl ether, diethylene glycol dimethyl ether, diethylene glycol ethyl methyl ether, diethylene glycol monoethyl ether, diethylene glycol monobutyl ether, propylene glycol alkyl ether acetate compounds such as propylene glycol methyl ether acetate and propylene glycol ethyl ether acetate, toluene, Aromatic hydrocarbons such as xylene, methyl ethyl ketone, methyl amyl ketone, cyclohexanone, 4-hydroxy-4-methyl-2-pentanone, ketones such as cyclohexanone, ethyl 2-hydroxypropionate, methyl 2-hydroxy-2-methylpropionate , 2-Hydroxy-2-methylpropionate, ethyl ethoxyacetate, ethyl hydroxyacetate, methyl 2-hydroxy-2-methylbutanoate,
- the coating composition comprises an acrylic resin (A), a black colorant (B), a quinonediazide compound (C), and if necessary, a resin (D) having an epoxy group and a phenolic hydroxyl group, a third resin (E), and a solution. It can be prepared by dissolving or dispersing the accelerator (F) or the optional component (G) in the solvent (H) and mixing them.
- the solid content concentration of the coating composition can be appropriately determined.
- the solid content concentration of the coating composition may be 1 to 60% by mass, 3 to 50% by mass, or 5 to 40% by mass.
- a known method can be used as the dispersion mixing method when a pigment is used.
- ball type such as ball mill, sand mill, bead mill, paint shaker, rocking mill, blade type such as kneader, paddle mixer, planetary mixer, henschel mixer, roll type such as 3-roll mixer, etc.
- An ultrasonic wave, a homogenizer, a rotation / revolution mixer, or the like may be used. It is preferable to use a bead mill from the viewpoint of dispersion efficiency and fine dispersion.
- the prepared coating composition is usually filtered before use.
- the filtration means include a millipore filter having a pore size of 0.05 to 1.0 ⁇ m.
- the coating composition prepared in this way is also excellent in long-term storage stability.
- the positive photosensitive resin composition When the positive photosensitive resin composition is used for radiation lithography, first, the positive photosensitive resin composition is dissolved or dispersed in a solvent to prepare a coating composition. Next, the coating composition can be applied to the surface of the substrate and the solvent can be removed by means such as heating to form a film.
- the method for applying the coating composition to the surface of the substrate is not particularly limited, and for example, a spray method, a roll coating method, a slit method, a spin coating method and the like can be used.
- the solvent is usually removed by heating to form a film (pre-bake).
- the heating conditions vary depending on the type of each component, the mixing ratio, etc., but a film is usually obtained by heat-treating at 70 to 130 ° C., for example, for 30 seconds to 20 minutes on a hot plate and 1 to 60 minutes in an oven. be able to.
- the prebaked film is irradiated with radiation (for example, visible light, ultraviolet light, far ultraviolet light, X-ray, electron beam, gamma ray, synchrotron radiation, etc.) through a photomask having a predetermined pattern (exposure step).
- radiation for example, visible light, ultraviolet light, far ultraviolet light, X-ray, electron beam, gamma ray, synchrotron radiation, etc.
- Preferred radiation is ultraviolet or visible light having a wavelength of 250-450 nm.
- the radiation is i-ray.
- the radiation is ghi rays.
- a heat treatment may be performed to promote the decomposition of the acid-decomposable group.
- PEB heat treatment
- the heating conditions vary depending on the type of each component, the mixing ratio, etc., but PEB is usually performed by heat-treating at 70 to 140 ° C., for example, for 30 seconds to 20 minutes on a hot plate and 1 to 60 minutes in an oven. be able to.
- PEB after the exposure step can be omitted.
- the film is developed by contacting it with a developing solution, unnecessary parts are removed, and a pattern is formed on the film (development step).
- a developing solution include inorganic alkalis such as sodium hydroxide, potassium hydroxide, sodium carbonate, sodium silicate, sodium metasilicate, and aqueous ammonia; primary amines such as ethylamine and n-propylamine; diethylamine and di.
- Secondary amines such as -n-propylamine; Tertiary amines such as triethylamine and methyldiethylamine; Alcohol amines such as dimethylethanolamine and triethanolamine; Tetramethylammonium hydroxide, tetraethylammonium hydroxide, choline Tertiary ammonium salts such as pyrrole, piperidine, 1,8-diazabicyclo [5.4.0] -7-undecene, 1,5-diazabicyclo [4.3.0] -5-nonane and the like cyclic amines and the like.
- An aqueous solution of the alkaline compound of can be used.
- An aqueous solution obtained by adding an appropriate amount of a water-soluble organic solvent such as methanol or ethanol, a surfactant or the like to an alkaline aqueous solution can also be used as a developing solution.
- the development time is usually 30 to 180 seconds.
- the developing method may be any of a liquid filling method, a shower method, a dipping method and the like. After development, a pattern can be formed on the film by washing with running water for 30 to 90 seconds, removing unnecessary portions, and air-drying with compressed air or compressed nitrogen.
- a cured film can be obtained by heat-treating the patterned film with a heating device such as a hot plate or an oven at 100 to 350 ° C. for 20 to 200 minutes (post-baking, heat treatment). Process).
- a heating device such as a hot plate or an oven at 100 to 350 ° C. for 20 to 200 minutes
- the temperature may be kept constant, the temperature may be continuously increased, or the temperature may be increased stepwise.
- the heat treatment is preferably performed in a nitrogen atmosphere.
- the optical density (OD value) of the cured film of the positive photosensitive resin composition is preferably 0.5 or more, more preferably 0.7 or more, and 1.0 or more per 1 ⁇ m of the film thickness. Is even more preferable. When the OD value of the cured film is 0.5 or more per 1 ⁇ m of the film thickness, sufficient light-shielding property can be obtained.
- One embodiment of the method for producing an organic EL element partition wall or an insulating film is to prepare a coating composition by dissolving or dispersing a positive photosensitive resin composition in a solvent, or applying the coating composition to a substrate to form a coating.
- the acid-degradable group of the acrylic resin (A) is formed by forming the film, removing the solvent contained in the film to dry the film, and irradiating the dried film with radiation through a photomask to expose the film.
- At least a part of the film is decomposed, the film after exposure is developed by contacting it with a developing solution to form a pattern on the film, and the film on which the pattern is formed is heated at a temperature of 100 ° C to 350 ° C. It involves processing to form an organic EL element bulkhead or insulating film.
- the above PEB can also be performed after exposure and before development.
- One embodiment is an organic EL device partition wall containing a cured product of a positive photosensitive resin composition.
- One embodiment is an organic EL device insulating film containing a cured product of a positive photosensitive resin composition.
- One embodiment is an organic EL device containing a cured product of a positive photosensitive resin composition.
- the two obtained solutions were simultaneously placed in 40.0 g of 1-methoxy-2-propyl acetate (manufactured by Daicel Corporation) heated to 85 ° C. in a nitrogen gas atmosphere in a 300 mL three-necked flask over 2 hours. The mixture was added dropwise, and then the reaction was carried out at 85 ° C. for 3 hours. The reaction solution cooled to room temperature was added dropwise to 815 g of toluene to precipitate the copolymer. The precipitated copolymer was recovered by filtration and vacuum dried at 90 ° C. for 4 hours to recover 32.4 g of white powder.
- the obtained PCX-02e had a number average molecular weight of 3100 and a weight average molecular weight of 6600.
- the obtained powder was dissolved in propylene glycol monomethyl acetate to prepare a 20% by mass solid content solution of the acrylic resin (A) (PCX-02e-POE 58%) in which the phenolic hydroxyl group was protected by a 1-n-propoxyethyl group. Obtained.
- the obtained PCX-02e-POE 58% has a number average molecular weight of 4500, a weight average molecular weight of 8400, a proportion of phenolic hydroxyl groups protected by acid-degradable groups of 58 mol%, and at least one phenolic hydroxyl group is acid-decomposed.
- the number of structural units represented by the formula (3) protected by the sex group was 49% of the total number of structural units of the acrylic resin (A).
- the ratio of phenolic hydroxyl groups protected by acid-decomposable groups is determined by using a thermogravimetric differential thermal analyzer (TG / DTA6200, manufactured by Hitachi High-Tech Science Co., Ltd.) in a nitrogen gas stream at a heating rate of 10 ° C./min.
- the obtained PCX-02e-THF 55% has a number average molecular weight of 3600, a weight average molecular weight of 6900, a proportion of phenolic hydroxyl groups protected by acid-degradable groups of 55 mol%, and at least one phenolic hydroxyl group is acid-decomposed.
- the number of structural units represented by the formula (3) protected by the sex group was 47% of the total number of structural units of the acrylic resin (A).
- the obtained PCX-02e-THF 29% has a number average molecular weight of 3700, a weight average molecular weight of 6800, a proportion of phenolic hydroxyl groups protected by acid-degradable groups of 29 mol%, and at least one phenolic hydroxyl group is acid-decomposed.
- the number of structural units represented by the formula (3) protected by the sex group was 25% of the total number of structural units of the acrylic resin (A).
- the reaction solution was returned to room temperature, diluted with ⁇ -butyrolactone to a solid content of 20% by mass, and the solution was filtered to obtain a solution of 286.5 g of a second resin (N770OH70) having an epoxy group and a phenolic hydroxyl group.
- the obtained reactants had a number average molecular weight of 2200, a weight average molecular weight of 6900, and an epoxy equivalent of 2000.
- a solution of a second resin (N695OH70) having 304.2 g of an epoxy group and a phenolic hydroxyl group was obtained in the same manner as in Production Example 5.
- the obtained reactants had a number average molecular weight of 3000, a weight average molecular weight of 7500, and an epoxy equivalent of 2200.
- the two obtained solutions were simultaneously placed in 61.2 g of 1-methoxy-2-propyl acetate (manufactured by Daicel Corporation) heated to 85 ° C. in a nitrogen gas atmosphere in a 300 mL three-necked flask over 2 hours. The mixture was added dropwise, and then the reaction was carried out at 85 ° C. for 3 hours. The reaction solution cooled to room temperature was added dropwise to 815 g of toluene to precipitate the copolymer. The precipitated copolymer was recovered by filtration and vacuum dried at 90 ° C. for 4 hours to recover 33.4 g of white powder.
- the obtained PCX-01 had a number average molecular weight of 6600 and a weight average molecular weight of 11600.
- Acrylic resin (A) As the acrylic resin (A), PCX-02e-POE 58%, PCX-02e-THF 55%, and PCX-02e-THF 29% were used.
- Black colorant (B) As the black colorant (B), a black dye VALIFAST (registered trademark) BLACK 3820 (black dye specified by CI of Solvent Black 27, manufactured by Orient Chemical Industry Co., Ltd.) was used.
- VALIFAST registered trademark
- BLACK 3820 black dye specified by CI of Solvent Black 27, manufactured by Orient Chemical Industry Co., Ltd.
- TS-150A As the quinone diazide compound (C), the quinone diazide compound TS-150A (4,4'-[1- [4- [1- (4-hydroxyphenyl) -1-methylethyl] phenyl] ethylidene], which is a quinone diazide-based photoacid generator, is used. Ester of bisphenol (TrisP-PA) and 6-diazo-5,6-dihydro-5-oxonaphthalene-1-sulfonic acid (1,2-naphthoquinonediazide-5-sulfonic acid), manufactured by Toyo Synthetic Industry Co., Ltd.) It was used. The structure of TS-150A is shown below.
- N770OH70 and N695OH70 were used as the resin (D) having an epoxy group and a phenolic hydroxyl group.
- PCX-02e, PCX-01, and TR4020G (cresol novolak resin, manufactured by Asahi Organic Materials Industry Co., Ltd.) were used as the third resin (E).
- Phloroglucinol and adipic acid were used as the dissolution accelerator (F).
- a positive photosensitive resin composition was bar-coated on a glass substrate (size 100 mm ⁇ 100 mm ⁇ 1 mm) so that the dry film thickness was 2.4 to 4.5 ⁇ m, and on a hot plate under the conditions shown in Table 1. It was heated and prebaked. The dry film thickness was measured using an optical film thickness measuring device (F20-NIR, manufactured by Filmometrics Co., Ltd.) to obtain a post-prebaked film thickness ( ⁇ m).
- an exposure device (trade name: Multilight ML-251A / B, manufactured by Ushio, Inc.) incorporating an ultra-high pressure mercury lamp was used to apply a coating film of 100 mJ / via a quartz photomask (having an aperture pattern of ⁇ 10 ⁇ m). Exposure was performed at cm 2 (i-line illuminance). The exposure amount was measured using an ultraviolet integrated photometer (trade name UIT-150 light receiving unit UVD-S365, manufactured by Ushio, Inc.). After exposure, PEB was performed without PEB or by heating the coating film on a hot plate at 110 ° C. for 240 seconds or 280 seconds, and then using a spin developer (AD-1200, manufactured by Takizawa Sangyo Co., Ltd.).
- a spin developer AD-1200, manufactured by Takizawa Sangyo Co., Ltd.
- Alkaline development was carried out for 60 seconds with a 38 mass% tetramethylammonium hydroxide aqueous solution.
- the film thickness of the unexposed portion after alkaline development was measured again using an optical film thickness measuring device (F20-NIR, manufactured by Filmometrics Co., Ltd.) to obtain a post-development film thickness ( ⁇ m).
- the coating film was heated at 250 ° C. for 60 minutes in an inert oven (DN411I, manufactured by Yamato Kagaku Co., Ltd.) to cure.
- the film thickness of the unexposed portion after curing was measured again using an optical film thickness measuring device (F20-NIR, manufactured by Filmometrics Co., Ltd.) to obtain a film thickness after curing ( ⁇ m).
- alkali solubility The solution obtained by subtracting the post-development film thickness ( ⁇ m) from the pre-baked film thickness ( ⁇ m) was defined as alkali solubility ( ⁇ m). It can be said that the smaller this value is, the higher the alkali solubility resistance of the unexposed portion is.
- the mass part of the composition in Table 1 is a solid content conversion value.
- Table 1 shows the evaluation results of the positive photosensitive resin compositions of Examples 1 to 7 and Comparative Examples 1 to 7.
- 0 means that the hole did not open.
- na Means that the hole did not open or the pattern could not be formed and the measurement could not be performed.
- PEB was not performed in Examples 1 to 5, the hole diameter was 6.4 ⁇ m or more, and the hole could be formed with high resolution. PEB can also be performed as shown in Examples 6 and 7.
- Comparative Examples 1 to 3 containing no acrylic resin (A) the holes did not open (Comparative Examples 1 and 3), or the unexposed portion was completely melted and the pattern could not be formed (Comparative Example 2).
- Comparative Example 4 in which the photoacid generator of Example 5 was changed from the quinonediazide compound (C) to PAG-103, a large amount of the unexposed portion was dissolved and the pattern could not be formed.
- Comparative Example 6 In Comparative Example 6 in which the PEB time of Comparative Example 5 was extended by 40 seconds, a large amount of the unexposed portion was dissolved and the pattern could not be formed. From the results of Comparative Examples 5 and 6, it can be seen that the process window under the PEB condition is narrow in the chemical amplification system using PAG-103. In Comparative Example 7 in which PEB was not performed on the positive photosensitive resin composition having the same composition as that of Comparative Example 5 and Comparative Example 6, the hole was not opened.
- the positive photosensitive resin composition according to the present embodiment can be suitably used for radiation lithography for forming a partition wall or an insulating film of an organic EL element.
- the organic EL device provided with a partition wall or an insulating film formed from the positive photosensitive resin composition according to the present embodiment is suitably used as an electronic component of a display device showing good contrast.
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Abstract
Description
[1]
複数のフェノール性水酸基を有し、前記複数のフェノール性水酸基の少なくとも一部が酸分解性基で保護されたアクリル樹脂(A)と、
黒色染料及び黒色顔料からなる群より選択される少なくとも1種の黒色着色剤(B)と、
光酸発生剤としてキノンジアジド化合物(C)と
を含む、ポジ型感光性樹脂組成物。
[2]
前記アクリル樹脂(A)が、式(3)
[3]
前記アクリル樹脂(A)が、式(2)
[4]
前記アクリル樹脂(A)が式(3)で表される前記構造単位を60モル%~100モル%含む、[2]又は[3]のいずれかに記載のポジ型感光性樹脂組成物。
[5]
樹脂成分の合計100質量部を基準として、20質量部~50質量部の前記キノンジアジド化合物(C)を含む、[1]~[4]のいずれかに記載のポジ型感光性樹脂組成物。
[6]
前記キノンジアジド化合物(C)以外の光酸発生剤の含有量が、樹脂成分の合計100質量部を基準として、0.5質量部以下である、[1]~[5]のいずれかに記載のポジ型感光性樹脂組成物。
[7]
前記アクリル樹脂(A)の前記酸分解性基が、式(6)
-CR6R7-O-R8 (6)
で表される基であり、式(6)中、R6及びR7は、それぞれ独立して水素原子、又は炭素原子数1~4の直鎖状若しくは分岐状のアルキル基であり、R8は、炭素原子数1~12の直鎖状、分岐状若しくは環状のアルキル基、炭素原子数7~12のアラルキル基、又は炭素原子数2~12のアルケニル基であり、R6又はR7の一方とR8とが結合して環員数3~10の環構造を形成してもよく、R6、R7及びR8は、フッ素、塩素、臭素及びヨウ素からなる群より選ばれるハロゲン原子で置換されていてもよい、[1]~[6]のいずれかに記載のポジ型感光性樹脂組成物。
[8]
前記アクリル樹脂(A)のフェノール性水酸基の10モル%~95モル%が前記酸分解性基で保護されている、[1]~[7]のいずれかに記載のポジ型感光性樹脂組成物。
[9]
樹脂成分の合計質量を基準として、30質量%~90質量%の前記アクリル樹脂(A)を含む、[1]~[8]のいずれかに記載のポジ型感光性樹脂組成物。
[10]
樹脂成分の合計100質量部を基準として、10質量部~150質量部の前記黒色着色剤(B)を含む、[1]~[9]のいずれかに記載のポジ型感光性樹脂組成物。
[11]
前記ポジ型感光性樹脂組成物の硬化被膜の光学濃度(OD値)が膜厚1μmあたり0.5以上である、[1]~[10]のいずれかに記載のポジ型感光性樹脂組成物。
[12]
エポキシ基及びフェノール性水酸基を有する樹脂(D)をさらに含む、[1]~[11]のいずれかに記載のポジ型感光性樹脂組成物。
[13]
前記エポキシ基及びフェノール性水酸基を有する樹脂(D)が、1分子中に少なくとも2個のエポキシ基を有する化合物とヒドロキシ安息香酸化合物との反応物であって、式(5)
[14]
前記1分子中に少なくとも2個のエポキシ基を有する化合物がノボラック型エポキシ樹脂である、[13]に記載のポジ型感光性樹脂組成物。
[15]
前記ヒドロキシ安息香酸化合物がジヒドロキシ安息香酸化合物である、[13]又は[14]のいずれかに記載のポジ型感光性樹脂組成物。
[16]
[1]~[15]のいずれかに記載のポジ型感光性樹脂組成物の硬化物を含む有機EL素子隔壁。
[17]
[1]~[15]のいずれかに記載のポジ型感光性樹脂組成物の硬化物を含む有機EL素子絶縁膜。
[18]
[1]~[15]のいずれかに記載のポジ型感光性樹脂組成物の硬化物を含む有機EL素子。
アクリル樹脂(A)は、α-アルキルアクリル酸エステルの(共)重合体であって、複数のフェノール性水酸基を有し、複数のフェノール性水酸基の少なくとも一部が酸分解性基で保護されたものであれば特に限定されない。フェノール性水酸基はアルカリ可溶性官能基であり、その一部が酸分解性基で保護されていることにより、アクリル樹脂(A)の露光前のアルカリ溶解性は抑制されている。アクリル樹脂(A)は、重合体主鎖にペンダントしたベンゼン環上にフェノール性水酸基を有する。この構造に起因して、アクリル樹脂(A)は、同等の水酸基価を有するノボラック樹脂と比較して、現像液中のアルカリ化合物がフェノール性水酸基に接近しやすくアルカリ可溶性が高い。そのため、アクリル樹脂(A)は、露光前後(酸分解性基の分解前後)でのアルカリ可溶性の変化が大きく、その結果、パターンの解像度をより高めることができる。アクリル樹脂(A)は、フェノール性水酸基以外のアルカリ可溶性官能基を有していてもよく、それらのアルカリ可溶性官能基は、フェノール性水酸基と同様に酸分解性基で保護されていてもよい。露光時に発生した酸が触媒的に酸分解性基の分解(脱保護)を促進してフェノール性水酸基を再生する。露光後必要に応じて露光後ベーク(PEB、post exposure bake)を行ってもよい。これにより現像時に露光部でアクリル樹脂(A)のアルカリ溶解が促進される。アクリル樹脂(A)はフェノール性水酸基以外のアルカリ可溶性官能基、例えばカルボキシ基、スルホ基、リン酸基、酸無水物基、メルカプト基等を有してもよい。アクリル樹脂(A)は、単独で、又は2種類以上を組み合わせて用いることができる。例えば、アクリル樹脂(A)は、重合体の構造単位、酸分解性基、フェノール性水酸基の保護率、又はこれらの組み合わせが異なる2種類以上の樹脂の組み合わせであってよい。
アクリル樹脂(A)は、複数のフェノール性水酸基を有するベースアクリル樹脂(a)のフェノール性水酸基の一部を酸分解性基で保護することによって得ることができる。酸分解性基で保護されたフェノール性水酸基を有するアクリル樹脂(A)は、Ar-O-Rの部分構造を有し、Arはフェノール由来の芳香環を表し、Rは酸分解性基を表す。
-CR6R7-O-R8 (6)
(式(6)中、R6及びR7は、それぞれ独立して水素原子、又は炭素原子数1~4のアルキル基(直鎖状若しくは分岐状)であり、R8は、炭素原子数1~12のアルキル基(直鎖状、分岐状若しくは環状)、炭素原子数7~12のアラルキル基、又は炭素原子数2~12のアルケニル基であり、R6又はR7の一方とR8とが結合して環員数3~10の環構造を形成してもよく、R6、R7及びR8は、フッ素、塩素、臭素及びヨウ素からなる群より選ばれるハロゲン原子で置換されていてもよい。)で表される基が挙げられる。式(6)で表される基は、フェノール性水酸基由来の酸素原子と一緒にアセタール構造又はケタール構造を形成する。これらの酸分解性基は、単独で、又は2種類以上を組み合わせて用いることができる。
アクリル樹脂(A)のベースアクリル樹脂(a)としては、フェノール性水酸基を有する重合性単量体の単独重合体又は共重合体を使用することができる。フェノール性水酸基を有する重合性単量体及びその他の重合性単量体の少なくとも一方は、α-アルキルアクリル酸エステルである。これらのベースアクリル樹脂(a)は、単独で、又は2種類以上を組み合わせて用いることができる。ベースアクリル樹脂(a)はラジカル重合性官能基を有してもよい。一実施態様では、ベースアクリル樹脂(a)はラジカル重合性官能基として(メタ)アクリロイルオキシ基、アリル基又はメタリル基を有する。
一実施態様では、アクリル樹脂(A)のベースアクリル樹脂(a)は、フェノール性水酸基を有する重合性単量体とその他の重合性単量体とのアルカリ水溶液可溶性共重合体(a1)であり、アルカリ水溶液可溶性共重合体(a1)は複数のフェノール性水酸基を有する。この実施態様において、アクリル樹脂(A)は、アルカリ水溶液可溶性共重合体(a1)の複数のフェノール性水酸基の少なくとも一部が酸分解性基で保護されたものである。アルカリ水溶液可溶性共重合体(a1)は、フェノール性水酸基以外のアルカリ可溶性官能基、例えばカルボキシ基、スルホ基、リン酸基、酸無水物基、又はメルカプト基をさらに有してもよい。重合性官能基として、例えば、CH2=CH-、CH2=C(CH3)-、CH2=CHCO-、CH2=C(CH3)CO-、-OC-CH=CH-CO-などのラジカル重合性官能基を有する。
で表される構造単位、及び式(2)
で表される構造単位を有する。
-CR6R7-O-R8 (6)
で表される基であることが好ましく、式(6)中、R6及びR7は、それぞれ独立して水素原子、又は炭素原子数1~4のアルキル基(直鎖状若しくは分岐状)であり、R8は炭素原子数1~12のアルキル基(直鎖状、分岐状若しくは環状)、炭素原子数7~12のアラルキル基、又は炭素原子数2~12のアルケニル基であるか、R6又はR7の一方とR8とが結合して環員数3~10の環構造を形成することがより好ましい。R6、R7及びR8は、フッ素、塩素、臭素及びヨウ素からなる群より選ばれるハロゲン原子で置換されていてもよい。そのような酸分解性基としては、例えば、1-アルコキシアルキル基が挙げられる。1-アルコキシアルキル基としては、例えば、メトキシメチル基、1-メトキシエチル基、1-エトキシエチル基、1-n-プロポキシエチル基、1-n-ブトキシエチル基、1-イソブトキシエチル基、1-(2-クロロエトキシ)エチル基、1-(2-エチルヘキシルオキシ)エチル基、1-シクロヘキシルオキシエチル基、及び1-(2-シクロヘキシルエトキシ)エチル基が挙げられ、1-エトキシエチル基及び1-n-プロポキシエチル基が好ましい。R6又はR7の一方とR8とが結合して環員数3~10の環構造を形成した酸分解性基としては、例えば、2-テトラヒドロフラニル基、及び2-テトラヒドロピラニル基が挙げられ、2-テトラヒドロフラニル基が好ましい。
黒色着色剤(B)は黒色染料及び黒色顔料からなる群より選択される少なくとも1種である。黒色染料と黒色顔料とを併用してもよい。例えば、黒色着色剤(B)を含むポジ型感光性樹脂組成物を用いて有機EL素子に黒色の隔壁を形成することにより、有機ELディスプレイ等の表示装置の視認性を向上させることができる。
ポジ型感光性樹脂組成物は光酸発生剤としてキノンジアジド化合物(C)を含む。キノンジアジド化合物(C)は可視光、紫外光、γ線、電子線などの放射線が照射されると下記反応式1に示す反応を経てアルカリ可溶性のカルボン酸化合物を生成する。生成したカルボン酸化合物は、アクリル樹脂(A)の酸分解性基の分解を促進してフェノール性水酸基を再生させ、アクリル樹脂(A)のアルカリ溶解性を増大させる。キノンジアジド化合物は、感光前にはノボラック樹脂などのバインダー樹脂の官能基と相互作用(例えば水素結合形成)して、そのバインダー樹脂をアルカリ水溶液に対して不溶化させる。その一方で、放射線が照射された部分にアルカリ可溶性のカルボン酸化合物が存在することで、その部分にある樹脂がカルボン酸化合物と一緒にアルカリ水溶液に溶解し易くなる。さらに、カルボン酸化合物は、化学増幅レジストに一般に使用される光酸発生剤から生じる酸、例えばp-トルエンスルホン酸、1-プロパンスルホン酸などよりも分子構造が相対的に大きく、被膜中で拡散しにくい。これらが相乗的に作用する結果、未露光部と露光部のアルカリ可溶性の差を大きくすることができ、それにより低露光量でも高感度で高解像度のパターンを形成することができる。キノンジアジド化合物(C)は、単独で、又は2種類以上を組み合わせて用いることができる。
ポジ型感光性樹脂組成物は、エポキシ基及びフェノール性水酸基を有する樹脂(D)をさらに含んでもよい。エポキシ基及びフェノール性水酸基を有する樹脂(D)はアルカリ水溶液可溶性樹脂である。エポキシ基及びフェノール性水酸基を有する樹脂(D)はフェノール性水酸基以外のアルカリ可溶性官能基を有していてもよい。フェノール性水酸基及び他のアルカリ可溶性官能基は酸分解性基で保護されていてもよい。エポキシ基及びフェノール性水酸基を有する樹脂(D)は、例えば、1分子中に少なくとも2個のエポキシ基を有する化合物(以下、「エポキシ化合物」と表記することがある。)のエポキシ基の一部と、ヒドロキシ安息香酸化合物のカルボキシ基を反応させることで得ることができる。エポキシ基及びフェノール性水酸基を有する樹脂(D)のエポキシ基は、現像後の加熱処理(ポストベーク)時にフェノール性水酸基との反応により架橋を形成し、これにより被膜の耐薬品性、耐熱性などを向上させることができる。フェノール性水酸基は現像時のアルカリ水溶液に対する可溶性に寄与することから、エポキシ基及びフェノール性水酸基を有する樹脂(D)は、低露光量で露光したときに酸分解性基が十分に分解(脱保護)されなかったアクリル樹脂(A)の溶解促進剤としても機能し、これにより感光性樹脂組成物を高感度にすることができる。
ポジ型感光性樹脂組成物は、アクリル樹脂(A)及びエポキシ基及びフェノール性水酸基を有する樹脂(D)以外の第3樹脂(E)をさらに含んでもよい。第3樹脂(E)は、単独で、又は2種類以上を組み合わせて用いることができる。
ポジ型感光性樹脂組成物は、現像時にアルカリ可溶性部分の現像液への溶解性を向上させるための溶解促進剤(F)をさらに含んでもよい。溶解促進剤(F)として、カルボキシ基を有する化合物及びフェノール性水酸基を有する化合物からなる群より選択される有機低分子化合物が挙げられる。溶解促進剤(F)は、単独で、又は2種類以上を組み合わせて用いることができる。
ポジ型感光性樹脂組成物は、任意成分(G)として、熱硬化剤、界面活性剤、(B)以外の着色剤等を含むことができる。本開示において、任意成分(G)は(A)~(F)のいずれにも当てはまらないものと定義する。
[溶媒(H)]
ポジ型感光性樹脂組成物は、溶媒(H)に溶解させて溶液状態(但し、黒色顔料を含むときは、顔料は分散状態である。)のコーティング組成物として用いることができる。例えば、アクリル樹脂(A)と、任意にエポキシ基及びフェノール性水酸基を有する樹脂(D)及び第3樹脂(E)とを溶媒(H)に溶解して得られた溶液に、黒色着色剤(B)、及びキノンジアジド化合物(C)、並びに必要に応じて溶解促進剤(F)、熱硬化剤、界面活性剤等の任意成分(G)を所定の割合で混合することにより、ポジ型感光性樹脂組成物のコーティング組成物を調製することができる。コーティング組成物は、溶媒(H)の量を変化させることにより使用する塗布方法に適した粘度に調整することができる。
ポジ型感光性樹脂組成物を放射線リソグラフィーに使用する場合、まず、ポジ型感光性樹脂組成物を溶媒に溶解又は分散してコーティング組成物を調製する。次に、コーティング組成物を基板表面に塗布し、加熱等の手段により溶媒を除去して、被膜を形成することができる。基板表面へのコーティング組成物の塗布方法は特に限定されず、例えばスプレー法、ロールコート法、スリット法、スピンコート法等を使用することができる。
実施例及び比較例で使用した原料を以下のとおり製造又は入手した。
装置名:Shodex(登録商標)GPC-101
カラム:Shodex(登録商標)LF-804
移動相:テトラヒドロフラン
流速:1.0mL/分
検出器:Shodex(登録商標)RI-71
温度:40℃
4-ヒドロキシフェニルメタクリレート(昭和電工株式会社製「PQMA」)29.0g、及びN-シクロヘキシルマレイミド(株式会社日本触媒製)5.12gを、溶媒である1-メトキシ-2-プロピルアセテート(株式会社ダイセル製)96.5gに、重合開始剤としてV-601(富士フイルム和光純薬株式会社製)3.41gを、1-メトキシ-2-プロピルアセテート(株式会社ダイセル製)13.7gにそれぞれ完全に溶解させた。得られた2つの溶液を、300mLの3つ口型フラスコ中、窒素ガス雰囲気下で85℃に加熱した1-メトキシ-2-プロピルアセテート(株式会社ダイセル製)40.0gに同時に2時間かけて滴下し、その後85℃で3時間反応させた。室温まで冷却した反応溶液を815gのトルエン中に滴下し、共重合体を沈殿させた。沈殿した共重合体をろ過により回収し、90℃で4時間真空乾燥し白色の粉体を32.4g回収した。得られたPCX-02eの数平均分子量は3100、重量平均分子量は6600であった。
100mLの3つ口型フラスコ中で、フェノール性水酸基を有するα-アルキルアクリル酸エステルとその他の重合性単量体のアルカリ水溶液可溶性共重合体(PCX-02e)10.0g、及び酸触媒としてp-トルエンスルホン酸のピリジニウム塩(東京化成工業株式会社製)0.60gを、テトラヒドロフラン(富士フイルム和光純薬株式会社製)40.0gに溶解させた。その後窒素ガス雰囲気下で氷冷し、n-プロピルビニルエーテル(東京化成工業株式会社製)5.33gを1時間かけて滴下した。その後室温で4時間撹拌した。飽和炭酸水素ナトリウム水溶液で酸触媒を中和した後、水層を除去した。さらに有機層を水で2回洗浄した。その後、テトラヒドロフランを留去した。得られた固体を酢酸エチル50.0gに溶解させ、200gのトルエン中に滴下し、生成物を沈殿させた。沈殿物をろ過により回収し、80℃で4時間真空乾燥して白色の粉体11.0gを回収した。得られた粉体をプロピレングリコールモノメチルアセテートに溶解し、フェノール性水酸基が1-n-プロポキシエチル基で保護されたアクリル樹脂(A)(PCX-02e-POE58%)の固形分20質量%溶液を得た。得られたPCX-02e-POE58%の数平均分子量は4500、重量平均分子量は8400、酸分解性基で保護されているフェノール性水酸基の割合は58モル%、少なくとも1つのフェノール性水酸基が酸分解性基で保護されている式(3)で表される構造単位の数はアクリル樹脂(A)の全構造単位数の49%であった。酸分解性基で保護されているフェノール性水酸基の割合は、熱重量示差熱分析装置(TG/DTA6200、株式会社日立ハイテクサイエンス製)を用い、窒素ガス気流中、昇温速度10℃/分の条件下で室温から250℃まで昇温し、10分保持し、さらに昇温速度10℃/分の条件で400℃まで昇温したときの、260℃におけるアクリル樹脂(A)の重量減少率(%)より算出した。
n-プロピルビニルエーテルに代えて2,3-ジヒドロフラン(東京化成工業株式会社製)3.00gを用いた以外は製造例2と同様にして白色の粉体11.0gを回収した。得られた粉体をプロピレングリコールモノメチルアセテートに溶解し、フェノール性水酸基が2-テトラヒドロフラニル基で保護されたアクリル樹脂(A)(PCX-02e-THF55%)の固形分20質量%溶液を得た。得られたPCX-02e-THF55%の数平均分子量は3600、重量平均分子量は6900、酸分解性基で保護されているフェノール性水酸基の割合は55モル%、少なくとも1つのフェノール性水酸基が酸分解性基で保護されている式(3)で表される構造単位の数はアクリル樹脂(A)の全構造単位数の47%であった。
テトラヒドロフランを50.0g、2,3-ジヒドロフランを2.34g用いた以外は製造例2と同様にして白色の粉体10.0gを回収した。得られた粉体をプロピレングリコールモノメチルアセテートに溶解し、フェノール性水酸基が2-テトラヒドロフラニル基で保護されたアクリル樹脂(A)(PCX-02e-THF29%)の固形分20質量%溶液を得た。得られたPCX-02e-THF29%の数平均分子量は3700、重量平均分子量は6800、酸分解性基で保護されているフェノール性水酸基の割合は29モル%、少なくとも1つのフェノール性水酸基が酸分解性基で保護されている式(3)で表される構造単位の数はアクリル樹脂(A)の全構造単位数の25%であった。
300mLの3つ口型フラスコに溶媒としてγ-ブチロラクトン(三菱ケミカル株式会社製)75.2g、1分子中に少なくとも2個のエポキシ基を有する化合物としてEPICLON(登録商標)N-770(DIC株式会社製フェノールノボラック型エポキシ樹脂、エポキシ当量188)を37.6g仕込み、窒素ガス雰囲気下、60℃で溶解させた。そこへヒドロキシ安息香酸化合物として3,5-ジヒドロキシ安息香酸(富士フイルム和光純薬株式会社製)を20.1g(エポキシ1当量に対して0.65当量)、反応触媒としてトリフェニルホスフィン(東京化成工業株式会社製)を0.173g(0.660mmol)追加し、110℃で56時間反応させた。反応溶液を室温に戻し、γ-ブチロラクトンで固形分20質量%に希釈し、溶液をろ過して286.5gのエポキシ基及びフェノール性水酸基を有する第2樹脂(N770OH70)の溶液を得た。得られた反応物の数平均分子量は2200、重量平均分子量は6900、エポキシ当量は2000であった。
1分子中に少なくとも2個のエポキシ基を有する化合物としてEPICLON(登録商標)N-695(DIC株式会社製クレゾールノボラック型エポキシ樹脂、エポキシ当量214)を42.8g、反応触媒としてトリフェニルホスフィン(東京化成工業株式会社製)を0.166g(0.660mmol)を用い、110℃で21時間反応させた以外は製造例5と同様にして304.2gのエポキシ基及びフェノール性水酸基を有する第2樹脂(N695OH70)の溶液を得た。得られた反応物の数平均分子量は3000、重量平均分子量は7500、エポキシ当量は2200であった。
4-ヒドロキシフェニルメタクリレート(昭和電工株式会社製「PQMA」)28.0g、及びN-シクロヘキシルマレイミド(株式会社日本触媒製)7.89gを、溶媒である1-メトキシ-2-プロピルアセテート(株式会社ダイセル製)77.1gに、重合開始剤としてV-601(富士フイルム和光純薬株式会社製)3.66gを、1-メトキシ-2-プロピルアセテート(株式会社ダイセル製)14.6gにそれぞれ完全に溶解させた。得られた2つの溶液を、300mLの3つ口型フラスコ中、窒素ガス雰囲気下で85℃に加熱した1-メトキシ-2-プロピルアセテート(株式会社ダイセル製)61.2gに同時に2時間かけて滴下し、その後85℃で3時間反応させた。室温まで冷却した反応溶液を815gのトルエン中に滴下し、共重合体を沈殿させた。沈殿した共重合体をろ過により回収し、90℃で4時間真空乾燥し白色の粉体を33.4g回収した。得られたPCX-01の数平均分子量は6600、重量平均分子量は11600であった。
アクリル樹脂(A)として、PCX-02e-POE58%、PCX-02e-THF55%、及びPCX-02e-THF29%を使用した。
黒色着色剤(B)として、黒色染料であるVALIFAST(登録商標)BLACK 3820(ソルベントブラック27のC.I.で規定される黒色染料、オリエント化学工業株式会社製)を使用した。
キノンジアジド化合物(C)としてキノンジアジド系光酸発生剤であるキノンジアジド化合物TS-150A(4、4’-[1-[4-[1-(4-ヒドロキシフェニル)-1-メチルエチル]フェニル]エチリデン]ビスフェノール(TrisP-PA)と6-ジアゾ-5,6-ジヒドロ-5-オキソナフタレン-1-スルホン酸(1,2-ナフトキノンジアジド-5-スルホン酸)とのエステル、東洋合成工業株式会社製)を使用した。TS-150Aの構造を以下に示す。
実施例及び比較例で使用した評価方法は以下のとおりである。
ガラス基板(大きさ100mm×100mm×1mm)にポジ型感光性樹脂組成物を乾燥膜厚が2.4~4.5μmになるようにバーコートし、表1に示す条件で、ホットプレート上で加熱してプリベークを行った。乾燥膜厚を光学式膜厚測定装置(F20-NIR、フィルメトリクス株式会社製)を用いて測定して、プリベーク後膜厚(μm)とした。その後、超高圧水銀ランプを組み込んだ露光装置(商品名マルチライトML-251A/B、ウシオ電機株式会社製)で石英製のフォトマスク(φ10μmの開口パターンを有するもの)を介して被膜を100mJ/cm2(i線照度)で露光した。露光量は紫外線積算光量計(商品名UIT-150 受光部 UVD-S365、ウシオ電機株式会社製)を用いて測定した。露光後、PEBを行わずに、又はホットプレート上110℃で240秒間又は280秒間被膜を加熱してPEBを行った後、スピン現像装置(AD-1200、滝沢産業株式会社製)を用い2.38質量%テトラメチルアンモニウムハイドロオキサイド水溶液で60秒間アルカリ現像を行なった。アルカリ現像後の未露光部の膜厚を再び光学式膜厚測定装置(F20-NIR、フィルメトリクス株式会社製)を用いて測定して、現像後膜厚(μm)とした。さらに、被膜をイナートオーブン(DN411I、ヤマト科学株式会社製)内にて250℃で60分加熱して硬化した。硬化後の未露光部の膜厚を再び光学式膜厚測定装置(F20-NIR、フィルメトリクス株式会社製)を用いて測定して、硬化後膜厚(μm)とした。
プリベーク後膜厚(μm)から現像後膜厚(μm)を引いたものをアルカリ溶解性(μm)とした。この値が小さいほど、未露光部の耐アルカリ溶解性が高いと言える。
硬化後塗膜に形成されているホールの直径をマイクロスコープ(VHX-6000、キーエンス株式会社製)で測定し、ホール径とした。
[実施例1~7、及び比較例1~7]
表1に記載の組成でアクリル樹脂(A)、エポキシ基及びフェノール性水酸基を有する樹脂(D)及び第3樹脂(E)を混合して溶解し、得られた溶液に、表1に記載の黒色着色剤(B)、キノンジアジド化合物(C)又はその他の光酸発生剤、及び溶解促進剤(F)を加えてさらに混合した。成分が溶解したことを目視で確認した後、孔径0.22μmのミリポアフィルターで濾過し、固形分濃度12質量%のポジ型感光性樹脂組成物を調製した。表1における組成の質量部は固形分換算値である。実施例1~7、及び比較例1~7のポジ型感光性樹脂組成物の評価結果を表1に示す。表1の評価結果のホール径において、「0」とはホールが開口しなかったことを意味する。また、「n.a.」はホールが開口しない又はパターンが形成できず、測定できなかったことを意味する。
Claims (18)
- 複数のフェノール性水酸基を有し、前記複数のフェノール性水酸基の少なくとも一部が酸分解性基で保護されたアクリル樹脂(A)と、
黒色染料及び黒色顔料からなる群より選択される少なくとも1種の黒色着色剤(B)と、
光酸発生剤としてキノンジアジド化合物(C)と
を含む、ポジ型感光性樹脂組成物。 - 前記アクリル樹脂(A)が式(3)で表される前記構造単位を60モル%~100モル%含む、請求項2又は3のいずれかに記載のポジ型感光性樹脂組成物。
- 樹脂成分の合計100質量部を基準として、20質量部~50質量部の前記キノンジアジド化合物(C)を含む、請求項1~4のいずれか一項に記載のポジ型感光性樹脂組成物。
- 前記キノンジアジド化合物(C)以外の光酸発生剤の含有量が、樹脂成分の合計100質量部を基準として、0.5質量部以下である、請求項1~5のいずれか一項に記載のポジ型感光性樹脂組成物。
- 前記アクリル樹脂(A)の前記酸分解性基が、式(6)
-CR6R7-O-R8 (6)
で表される基であり、式(6)中、R6及びR7は、それぞれ独立して水素原子、又は炭素原子数1~4の直鎖状若しくは分岐状のアルキル基であり、R8は、炭素原子数1~12の直鎖状、分岐状若しくは環状のアルキル基、炭素原子数7~12のアラルキル基、又は炭素原子数2~12のアルケニル基であり、R6又はR7の一方とR8とが結合して環員数3~10の環構造を形成してもよく、R6、R7及びR8は、フッ素、塩素、臭素及びヨウ素からなる群より選ばれるハロゲン原子で置換されていてもよい、請求項1~6のいずれか一項に記載のポジ型感光性樹脂組成物。 - 前記アクリル樹脂(A)のフェノール性水酸基の10モル%~95モル%が前記酸分解性基で保護されている、請求項1~7のいずれか一項に記載のポジ型感光性樹脂組成物。
- 樹脂成分の合計質量を基準として、30質量%~90質量%の前記アクリル樹脂(A)を含む、請求項1~8のいずれか一項に記載のポジ型感光性樹脂組成物。
- 樹脂成分の合計100質量部を基準として、10質量部~150質量部の前記黒色着色剤(B)を含む、請求項1~9のいずれか一項に記載のポジ型感光性樹脂組成物。
- 前記ポジ型感光性樹脂組成物の硬化被膜の光学濃度(OD値)が膜厚1μmあたり0.5以上である、請求項1~10のいずれか一項に記載のポジ型感光性樹脂組成物。
- エポキシ基及びフェノール性水酸基を有する樹脂(D)をさらに含む、請求項1~11のいずれか一項に記載のポジ型感光性樹脂組成物。
- 前記1分子中に少なくとも2個のエポキシ基を有する化合物がノボラック型エポキシ樹脂である、請求項13に記載のポジ型感光性樹脂組成物。
- 前記ヒドロキシ安息香酸化合物がジヒドロキシ安息香酸化合物である、請求項13又は14のいずれかに記載のポジ型感光性樹脂組成物。
- 請求項1~15のいずれか一項に記載のポジ型感光性樹脂組成物の硬化物を含む有機EL素子隔壁。
- 請求項1~15のいずれか一項に記載のポジ型感光性樹脂組成物の硬化物を含む有機EL素子絶縁膜。
- 請求項1~15のいずれか一項に記載のポジ型感光性樹脂組成物の硬化物を含む有機EL素子。
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