WO2017204079A1 - ブラックカラムスペーサ形成用感光性樹脂組成物、ブラックカラムスペーサ及び画像表示装置 - Google Patents
ブラックカラムスペーサ形成用感光性樹脂組成物、ブラックカラムスペーサ及び画像表示装置 Download PDFInfo
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- WO2017204079A1 WO2017204079A1 PCT/JP2017/018679 JP2017018679W WO2017204079A1 WO 2017204079 A1 WO2017204079 A1 WO 2017204079A1 JP 2017018679 W JP2017018679 W JP 2017018679W WO 2017204079 A1 WO2017204079 A1 WO 2017204079A1
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- 229910052719 titanium Inorganic materials 0.000 description 1
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 1
- JOXIMZWYDAKGHI-UHFFFAOYSA-N toluene-4-sulfonic acid Chemical class CC1=CC=C(S(O)(=O)=O)C=C1 JOXIMZWYDAKGHI-UHFFFAOYSA-N 0.000 description 1
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-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
- 238000012546 transfer Methods 0.000 description 1
- JXUKBNICSRJFAP-UHFFFAOYSA-N triethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CCO[Si](OCC)(OCC)CCCOCC1CO1 JXUKBNICSRJFAP-UHFFFAOYSA-N 0.000 description 1
- JLGLQAWTXXGVEM-UHFFFAOYSA-N triethylene glycol monomethyl ether Chemical compound COCCOCCOCCO JLGLQAWTXXGVEM-UHFFFAOYSA-N 0.000 description 1
- 125000002221 trityl group Chemical group [H]C1=C([H])C([H])=C([H])C([H])=C1C([*])(C1=C(C(=C(C(=C1[H])[H])[H])[H])[H])C1=C([H])C([H])=C([H])C([H])=C1[H] 0.000 description 1
- JOHIXGUTSXXADV-UHFFFAOYSA-N undec-2-ene Chemical compound CCCCCCCCC=CC JOHIXGUTSXXADV-UHFFFAOYSA-N 0.000 description 1
- SDTYFWAQLSIEBH-UHFFFAOYSA-N undec-3-ene Chemical compound CCCCCCCC=CCC SDTYFWAQLSIEBH-UHFFFAOYSA-N 0.000 description 1
- JABYJIQOLGWMQW-UHFFFAOYSA-N undec-4-ene Chemical compound CCCCCCC=CCCC JABYJIQOLGWMQW-UHFFFAOYSA-N 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- JNELGWHKGNBSMD-UHFFFAOYSA-N xanthone powder Natural products C1=CC=C2C(=O)C3=CC=CC=C3OC2=C1 JNELGWHKGNBSMD-UHFFFAOYSA-N 0.000 description 1
- 229910052724 xenon Inorganic materials 0.000 description 1
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 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
- C08F2/00—Processes of polymerisation
- C08F2/46—Polymerisation initiated by wave energy or particle radiation
- C08F2/48—Polymerisation initiated by wave energy or particle radiation by ultraviolet or visible light
- C08F2/50—Polymerisation initiated by wave energy or particle radiation by ultraviolet or visible light with sensitising agents
-
- 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
- C08F2/00—Processes of polymerisation
- C08F2/46—Polymerisation initiated by wave energy or particle radiation
- C08F2/48—Polymerisation initiated by wave energy or particle radiation by ultraviolet or visible light
-
- 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
- C08F290/00—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups
- C08F290/08—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups on to polymers modified by introduction of unsaturated side groups
- C08F290/12—Polymers provided for in subclasses C08C or C08F
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1339—Gaskets; Spacers; Sealing of cells
-
- 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
- G03F7/038—Macromolecular compounds which are rendered insoluble or differentially wettable
Definitions
- the present invention relates to a photosensitive resin composition for forming a black column spacer, a black column spacer, and an image display device.
- a spacer is used to keep a distance (cell gap) between two substrates constant.
- various methods for forming spacers with a photosensitive resin composition have been proposed.
- a photosensitive resin composition is applied onto a substrate, a resin layer is formed, the resin layer is exposed through a predetermined mask, and then developed to form a columnar spacer or the like.
- the spacer can be formed only in a predetermined portion other than the pixel display portion.
- a black column spacer having a light shielding property by using a photosensitive resin composition to which a light shielding agent such as an organic black pigment is added (see Patent Documents 1 and 2).
- black column spacers are required to have high dimensional accuracy with respect to height.
- a substrate such as a TFT substrate in which elements are formed on the substrate is often used.
- By performing exposure through the halftone mask it is possible to change the exposure amount according to the place where the black column spacer is formed, and to form black column spacers having different heights at a time.
- the photosensitive resin composition for forming the black column spacer has a high optical density (Optical® Density: OD)
- OD optical density
- light cannot reach the lower part of the resin layer at the exposure stage, and curing is difficult to proceed. Therefore, in the prior art, after exposure and development are performed to form a step of the black column spacer, patterning is performed by thermosetting in the subsequent post-bake stage.
- the step formation margin of the black column spacer becomes very narrow, and there is a problem that the height of each step cannot be maintained uniformly (obtaining an excellent development margin) over the entire surface of the substrate.
- the lower part of the resin layer is cured mainly by thermosetting, there is a problem that necessary chemical resistance cannot be obtained sufficiently.
- the metal ions and the organic black pigment contained in the spacer pattern are more resistant to the solvent used in the subsequent manufacturing process. There is a problem of solvent resistance that elution is likely to occur. Therefore, there is a problem that the reliability of the black column spacer in contact with the liquid crystal is lowered.
- the present invention has been made to solve the above-described problems, and provides a photosensitive resin composition for forming a black column spacer that is excellent in colorant dispersibility, development margin, solvent resistance, and elastic recovery rate.
- the purpose is to do.
- [1] Selected from the group consisting of a structural unit (a) having a carboxyl group, a structural unit (b-1) having a (meth) acryloyloxy group, and a structural unit (b-2) having a functional group that reacts with a carboxyl group
- a photosensitive resin for forming a black column spacer comprising a resin (A) having at least one structural unit, a solvent (B), a photopolymerization initiator (C), and a colorant (D) Composition.
- a photosensitive resin composition for forming a black column spacer having excellent colorant dispersibility, development margin, solvent resistance and elastic recovery rate can be provided.
- the black column spacer obtained by curing the photosensitive resin composition for forming a black column spacer of the present invention is excellent in colorant dispersibility, solvent resistance, and elastic recovery rate.
- the photosensitive resin composition for forming a black column spacer of the present invention has a structural unit (a) having a carboxyl group, a structural unit (b-1) having a (meth) acryloyloxy group, and a functional group that reacts with the carboxyl group.
- a resin (A) having at least one structural unit selected from the group consisting of the structural unit (b-2), a solvent (B), a photopolymerization initiator (C), and a colorant (D) are contained.
- (meth) acryloyloxy group means at least one selected from acryloyloxy group and methacryloyloxy group
- (meth) acrylic acid means acrylic acid and methacrylic acid. It means at least one selected from acids
- (meth) acrylate means at least one selected from acrylate and methacrylate.
- the resin (A) used in the present invention comprises a structural unit (a) having a carboxyl group, a structural unit (b-1) having a (meth) acryloyloxy group, and a structural unit (b) having a functional group that reacts with a carboxyl group. -2) and at least one structural unit selected from the group consisting of:
- the “structural unit” means a monomer unit that forms the main chain of the resin (A). Furthermore, when another monomer is added to the monomer unit forming the main chain of the resin (A) to form a side chain, the monomer unit of the main chain and the monomer unit forming the side chain are combined.
- the resin (A) used in the present invention includes those having a carboxyl group and a (meth) acryloyloxy group in one structural unit.
- one structural unit has a carboxyl group and a (meth) acryloyloxy group, it may be represented as a structural unit (a, b-1).
- the structural unit (a) has a carboxyl group.
- the carboxyl group may have as an anhydride.
- the structural unit (a) can be generally introduced into the resin (A) by the following two methods.
- the first method is a method of introducing (derived from a carboxyl group-containing polymerizable monomer) by using a carboxyl group-containing polymerizable monomer as a polymerizable monomer used when producing the resin (A) by copolymerization. is there.
- carboxyl group-containing polymerizable monomers examples include (meth) acrylic acid, 2- (meth) acryloyloxyethyl succinic acid, 2- (meth) acryloyloxyethyl hexahydrophthalic acid, ⁇ -bromo (meth) acrylic acid, ⁇ -Unsaturated carboxylic acids such as furyl (meth) acrylic acid, crotonic acid, propiolic acid, cinnamic acid, ⁇ -cyanocinnamic acid, monomethyl maleate, monoethyl maleate, monoisopropyl maleate, monomethyl fumarate, monoethyl itaconate, etc. Is mentioned.
- These carboxyl group-containing polymerizable monomers may be used alone or in combination of two or more. Among these, (meth) acrylic acid is preferable from the viewpoint of availability and reactivity.
- the second method uses an epoxy group-containing (meth) acrylate as a polymerizable monomer used when the precursor of the resin (A) is produced by copolymerization, and the carboxyl group of the carboxyl group-containing monomer is added to the epoxy group.
- This is a method of introducing a carboxyl group by ring-opening an epoxy group by addition reaction, adding a polybasic acid or polybasic acid anhydride to a hydroxyl group generated at that time.
- epoxy group-containing (meth) acrylate examples include glycidyl (meth) acrylate, 2-glycidyloxyethyl (meth) acrylate, 3,4-epoxycyclohexylmethyl (meth) acrylate having an alicyclic epoxy, and a lactone adduct thereof.
- An epoxidized product of pentenyl (meth) acrylate, an epoxidized product of dicyclopentenyloxyethyl (meth) acrylate, and the like can be mentioned.
- These epoxy group-containing (meth) acrylates may be used alone or in combination of two or more. Among these, glycidyl (meth) acrylate is preferable from the viewpoint of availability and reactivity.
- the unsaturated carboxylic acid quoted by the above-mentioned 1st method can be used.
- (meth) acrylic acid is preferable from the viewpoint of reactivity.
- the polybasic acid include tetrahydrophthalic acid, hexahydrophthalic acid, 4-methylhexahydrophthalic acid, and succinic acid.
- the polybasic acid anhydride include the above-mentioned polybasic acid anhydrides. These polybasic acids and polybasic acid anhydrides may be used alone or in combination of two or more. Among these, tetrahydrophthalic anhydride is preferable from the viewpoint of improving developability.
- the structural unit (a, b-1) having a carboxyl group and a (meth) acryloyloxy group can be introduced into the resin (A).
- the structural unit (b-1) can be generally introduced into the resin (A) by the following two methods.
- the first method uses an epoxy group-containing (meth) acrylate as a polymerizable monomer used when a precursor of the resin (A) is produced by copolymerization, and a carboxyl group-containing (meth) acrylate is added to the epoxy group. It is a method of introducing by adding.
- the epoxy group-containing (meth) acrylate those described above can be used.
- Examples of the carboxyl group-containing (meth) acrylate include (meth) acrylic acid, 2- (meth) acryloyloxyethyl succinic acid, 2- (meth) acryloyloxyethyl hexahydrophthalic acid, ⁇ -bromo (meth) acrylic acid, Examples include ⁇ -furyl (meth) acrylic acid.
- the second method uses a carboxyl group-containing monomer as a polymerizable monomer to be used when the precursor of the resin (A) is produced by copolymerization, and the carboxyl group contains an epoxy group-containing (meth) acrylate or isocyanato group. It is a method of introducing by adding (meth) acrylate.
- a carboxyl group-containing monomer the unsaturated carboxylic acid mentioned as the above-mentioned carboxyl group-containing polymerizable monomer can be used.
- the epoxy group-containing (meth) acrylate those described above can be used.
- examples of the isocyanato group-containing (meth) acrylate include 2-isocyanatoethyl (meth) acrylate.
- the functional group that reacts with the carboxyl group of the structural unit (b-2) is not particularly limited, but usually includes an epoxy group, an oxetanyl group, an isocyanato group, and the like, and an epoxy group is particularly preferable.
- the structural unit (b-2) is introduced by using a functional group-containing polymerizable monomer that reacts with a carboxyl group as the polymerizable monomer used when the resin (A) is produced by copolymerization (reacted with the carboxyl group).
- the functional group-containing polymerizable monomer is used.
- Resin (A) a structural unit (a) having a carboxyl group, a structural unit (b-1) having a (meth) acryloyloxy group, and a structural unit (b-2) having a functional group that reacts with a carboxyl group
- a method for introducing the structural unit the above-described methods for introducing the structural unit (a), the structural unit (b-1), and the structural unit (b-2) can be appropriately combined.
- a preferred method is to use a carboxyl group-containing polymerizable monomer and a functional group-containing polymerizable monomer that reacts with a carboxyl group as the polymerizable monomer used when the precursor of the resin (A) is produced by copolymerization.
- An epoxy group-containing (meth) acrylate or an isocyanato group-containing (meth) acrylate may be added to a part of the carboxyl group derived from the containing polymerizable monomer.
- an epoxy group-containing (meth) acrylate is used as a polymerizable monomer to be used when a precursor of the resin (A) is produced by copolymerization, and a carboxyl group-containing (meth) is partially contained in the epoxy group.
- the epoxy group may be opened, and a polybasic acid anhydride may be added to a part of the hydroxyl group generated at that time.
- the structural unit (b-2) having a functional group that reacts with a carboxyl group
- the structural unit (b-1) having a (meth) acryloyloxy group
- structural units (a, b-1) having a carboxyl group and a (meth) acryloyloxy group.
- the resin (A) used in the present invention can have a structural unit (c) having an aromatic ring skeleton, if necessary, to obtain a resin (A) having better colorant dispersibility.
- the structural unit (c) is introduced by using an aromatic ring-containing polymerizable monomer as the polymerizable monomer used when the resin (A) is produced by copolymerization (derived from the aromatic ring-containing polymerizable monomer).
- aromatic ring-containing polymerizable monomer examples include styrene, ⁇ -methylstyrene, o-vinyltoluene, m-vinyltoluene, p-vinyltoluene, o-chlorostyrene, m-chlorostyrene, p-chlorostyrene, o- Aromatic vinyl compounds such as methoxystyrene, m-methoxystyrene, p-methoxystyrene, p-nitrostyrene, p-cyanostyrene, p-acetylaminostyrene; benzyl (meth) acrylate, rosin (meth) acrylate, phenyl (meta ) Acrylate, cumyl (meth) acrylate, phenoxyethyl (meth) acrylate, phenoxy-polyethylene glycol (meth) acrylate (trade name: Light
- a structural unit having a skeleton having a plurality of aromatic rings into the resin (A) used in the present invention, and a group consisting of a biphenyl skeleton, a naphthalene skeleton, and an anthracene skeleton It is more preferable to introduce a structural unit having at least one selected from
- the resin (A) used in the present invention has a structural unit (d) having a bridged alicyclic hydrocarbon group having 7 to 20 carbon atoms, so that the elastic recovery rate is more excellent. Resin (A) can be obtained.
- the structural unit (d) is introduced by using a polymerizable monomer having a bridged alicyclic hydrocarbon group having 7 to 20 carbon atoms as the polymerizable monomer used when the resin (A) is produced by copolymerization. (Derived from a polymerizable monomer having a bridged alicyclic hydrocarbon group having 7 to 20 carbon atoms).
- the bridged alicyclic hydrocarbon means one having a structure represented by the following formula (1) or (2) represented by adamantane, norbornane and the like.
- the bridged alicyclic hydrocarbon group refers to a group corresponding to the remaining part excluding some hydrogen atoms in these structures.
- a 1 and B 1 each independently represents a linear or branched alkylene group (which may include a ring), and R 4 represents a hydrogen atom or a methyl group.
- a 1 and B 1 may be a ring formed by connecting the branches of A 1 and B 1.
- a 2 , B 2 and L each independently represent a linear or branched alkylene group (which may include a ring), and R 5 represents a hydrogen atom or a methyl group.
- a 2 , B 2 and L may be formed by connecting the branches of A 2 , B 2 and L to each other.
- a (meth) acrylate having a bridged alicyclic hydrocarbon group having 7 to 20 carbon atoms is preferable, and has a structure represented by adamantyl (meth) acrylate and the following formula (3).
- (Meth) acrylate is more preferred.
- R 6 to R 8 each independently represents a hydrogen atom or a methyl group.
- R 9 and R 10 are a hydrogen atom or a methyl group, or are connected to each other to be saturated or An unsaturated ring (preferably a 5-membered ring or a 6-membered ring) may be formed.
- * represents a bond connected to a (meth) acryloyloxy group.
- Examples of the polymerizable monomer having a bridged alicyclic hydrocarbon group having 7 to 20 carbon atoms include dicyclopentenyl (meth) acrylate, dicyclopentanyl (meth) acrylate, isobornyl (meth) acrylate, adamantyl ( And (meth) acrylate.
- dicyclopentanyl methacrylate is preferable from the viewpoint of heat decomposition resistance and heat discoloration.
- These polymerizable monomers may be used alone or in combination of two or more.
- norbornene monomers represented by the following formula (4) can also be used as preferred polymerizable monomers for introducing the structural unit (d).
- X and Y each independently represent a hydrogen atom or a linear or branched hydrocarbon group having 1 to 4 carbon atoms, and R 1 and R 2 are each independently A hydrogen atom, a carboxyl group, or a hydrocarbon group having 1 to 20 carbon atoms (which may have a substituent), R 1 and R 2 may be linked to each other to form a cyclic structure; Good.
- linear or branched hydrocarbon group having 1 to 4 carbon atoms include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, t-butyl group.
- hydrocarbon group having 1 to 20 carbon atoms include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, t-butyl group, t-amyl group, stearyl group.
- norbornene-based monomer examples include norbornene (bicyclo [2.2.1] hept-2-ene), 5-methylbicyclo [2.2.1] hept-2-ene, and 5-ethylbicyclo [2. 2.1] hept-2-ene, tetracyclo [4.4.0.12, 5.17,10] dodec-3-ene, 8-methyltetracyclo [4.4.0.12, 5.17, 10] dodec-3-ene, 8-ethyltetracyclo [4.4.0.12, 5.17,10] dodec-3-ene, dicyclopentadiene, tricyclo [5.2.1.02,6] Deca-8-ene, tricyclo [5.2.1.02,6] deca-3-ene, tricyclo [4.4.0.12,5] undec-3-ene, tricyclo [6.2.1.
- the resin (A) used in the present invention may have a structural unit derived from a radical polymerizable monomer having an ethylenic carbon-carbon double bond other than the above structural unit, if necessary.
- a structural unit derived from a radical polymerizable monomer having an ethylenic carbon-carbon double bond is a radical polymerization having an ethylenic carbon-carbon double bond as a polymerizable monomer used when the resin (A) is produced by copolymerization. It introduce
- radical polymerizable monomer having an ethylenic carbon-carbon double bond examples include diene compounds such as butadiene, isoprene and chloroprene; methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, iso -Propyl (meth) acrylate, n-butyl (meth) acrylate, sec-butyl (meth) acrylate, iso-butyl (meth) acrylate, tert-butyl (meth) acrylate, cyclopentyl (meth) acrylate, cyclohexyl (meth) ) Acrylate, methylcyclohexyl (meth) acrylate, ethylcyclohexyl (meth) acrylate, 1,4-cyclohexanedimethanol mono (meth) acrylate, norbornyl (meth) acrylate,
- (meth) acrylic acid amide (meth) acrylic acid N, N-dimethylamide, (meth) acrylic acid N, N-diethylamide, (meth) acrylic acid N, N-dipropylamide, (meth) acrylic (Meth) acrylic amides such as acid N, N-di-isopropylamide, (meth) acrylic acid anthracenyl amide; (meth) acrylic acid anilide, (meth) acrylonitrile, acrolein, vinyl chloride, vinylidene chloride, fluoride Vinyl compounds such as vinyl, vinylidene fluoride, N-vinylpyrrolidone, vinylpyridine, vinyl acetate, vinyltoluene; unsaturated dicarboxylic acid diester compounds such as diethyl citraconic acid, diethyl maleate, diethyl fumarate, diethyl itaconate; N- Phenylmaleimide, N-cyclohexylmaleimide,
- the reaction conditions in the copolymerization reaction for obtaining the resin (A) used in the present invention or the copolymerization reaction for obtaining the resin (A) precursor before the addition reaction may be appropriately set according to a conventional method.
- the copolymerization reaction is preferably performed at 50 to 150 ° C., more preferably 60 to 140 ° C. for 1 to 12 hours while dropping a polymerizable monomer and a polymerization initiator for copolymerization in a solvent. Just do it.
- the addition reaction to the resin (A) precursor is performed by adding a monomer for addition reaction with the resin (A) precursor in a solvent, and further adding an addition reaction catalyst, preferably 50 to 150 ° C., more preferably The reaction may be performed at 80 to 130 ° C.
- Preferred constitutional unit ratios of the resin (A) used in the present invention are as follows (I) to (IV).
- Resin (A) having a structural unit (a) having a carboxyl group and a structural unit (b-1) having a (meth) acryloyloxy group is 10 to 70 mol% of structural units (a) and 10 It is preferable to have the structural unit (b-1) of ⁇ 80 mol%, more preferably the structural unit (a) of 20 to 60 mol% and the structural unit (b-1) of 15 to 70 mol%. preferable.
- the resin (A) having the structural unit (a) having a carboxyl group and the structural unit (b-2) having a functional group that reacts with the carboxyl group is composed of 10 to 80 mol% of the structural unit (a). It preferably has 10 to 70 mol% of the structural unit (b-2), and preferably has 20 to 70 mol% of the structural unit (a) and 15 to 60 mol% of the structural unit (b-2). More preferred.
- A) preferably has 10 to 70 mol% of the structural unit (a), 10 to 70 mol% of the structural unit (b-1) and 10 to 50 mol% of the structural unit (b-2). More preferably, it has 20 to 60 mol% of the structural unit (a), 20 to 60 mol% of the structural unit (b-1), and 20 to 40 mol% of the structural unit (b-2).
- the resin (A) having the structural unit (b-2) is 10 to 80 mol% of the structural unit (a, b-1), 10 to 80 mol% of the structural unit (b-1) and 1 to 10 mol. % Of the structural unit (b-2), preferably 20 to 70 mol% of the structural unit (a, b-1), 15 to 70 mol% of the structural unit (b-1) and 1 to 5 mol%.
- the structural unit (b-2) is more preferable.
- the structural unit (a) having a carboxyl group is 10 mol% or more, the developability is good, which is preferable. On the other hand, if the ratio of the structural unit (a) having a carboxyl group is not more than the above upper limit value, it is preferable because a decrease in the remaining film rate during development can be prevented. If the structural unit (b-1) having a (meth) acryloyloxy group is 10 mol% or more, the solvent resistance and developability are improved, which is preferable. On the other hand, if the ratio of the structural unit (b-1) having a (meth) acryloyloxy group is not more than the above upper limit value, it is preferable because generation of a residue during development can be suppressed.
- the structural unit (b-2) having a functional group that reacts with a carboxyl group is 10 mol% or more, the solvent resistance is improved, which is preferable.
- the ratio of the structural unit (b-2) having a functional group that reacts with a carboxyl group is equal to or less than the upper limit because storage stability is improved.
- the structural unit (c) having an aromatic ring skeleton and a bridged alicyclic group having 7 to 20 carbon atoms are optionally added.
- the structural unit (d) having the formula hydrocarbon group or other structural units can be introduced.
- the structural unit (c) having an aromatic ring skeleton is introduced, it is preferably more than 0 mol% to 50 mol%, more preferably more than 0 mol% to 40 mol% of the structural unit of the resin (A). preferable.
- the structural unit (d) having a bridged alicyclic hydrocarbon group having 7 to 20 carbon atoms is introduced, it is preferably more than 0 mol% to 40 mol% of the structural unit of the resin (A). More preferably, it is more than mol% to 30 mol%. When other structural units are introduced, it is preferably more than 0 mol% to 60 mol%, more preferably more than 0 mol% to 50 mol% of the structural unit of the resin (A).
- the solvent that can be used in the copolymerization reaction is not particularly limited, and known solvents can be used as appropriate.
- Specific examples of the solvent include ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol mono-n-propyl ether, diethylene glycol mono-n-butyl ether, triethylene glycol monomethyl ether, triethylene Glycol monoethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, dipropylene glycol monomethyl ether, dipropylene glycol monoethyl ether, dipropylene glycol mono-n-propyl ether, dipropylene glycol mono-n-butyl ether, tripropylene Glycol monomethyl ether, tri (Poly) alkylene glycol monoalkyl ethers such as propylene glycol monoethyl ether; (
- (poly) alkylene glycol monoalkyl ethers such as propylene glycol monomethyl ether and (poly) alkylene glycol monoalkyl ether acetates such as propylene glycol monomethyl ether acetate, that is, glycol ether solvents are preferable.
- the amount of the solvent used for the copolymerization reaction is not particularly limited, but is generally 30 to 1000 parts by mass, preferably 50 to 800 parts by mass when the total amount of monomers charged is 100 parts by mass. . If the amount of the solvent used is 1000 parts by mass or less, a decrease in the molecular weight of the resin (A) due to the chain transfer action can be efficiently suppressed, and the viscosity of the resin (A) can be controlled within an appropriate range. preferable. On the other hand, if the amount of the solvent used is 30 parts by mass or more, it is preferable because abnormality can be prevented in the copolymerization reaction and the copolymerization reaction can be performed stably. Moreover, coloring and gelation of resin (A) can also be prevented.
- the polymerization initiator that can be used for the copolymerization reaction is not particularly limited, and known ones can be used as appropriate.
- Specific examples of the polymerization initiator include azobisisobutyronitrile, azobisisovaleronitrile, benzoyl peroxide, and t-butylperoxy-2-ethylhexanoate. These polymerization initiators may be used alone or in combination of two or more.
- the amount of the polymerization initiator used is not particularly limited, but is generally 0.5 to 20 parts by mass, preferably 0.7 to 15 parts by mass when the total amount of monomers charged is 100 parts by mass. More preferably, it is 1 to 10 parts by mass.
- the type of addition reaction catalyst used for the addition reaction of the monomer to the precursor is not particularly limited, and is selected as necessary.
- the addition reaction catalyst include tertiary amines such as triethylamine, quaternary ammonium salts such as triethylbenzylammonium chloride, phosphorus compounds such as triphenylphosphine, and chromium chelate compounds. These addition reaction catalysts may be used alone or in combination of two or more.
- the amount of addition reaction catalyst used is not particularly limited, but is generally 0.01 to 5 parts by weight, preferably 0.1 to 5 parts by weight when the amount of the resin (A) precursor is 100 parts by weight. 2 parts by mass, more preferably 0.2-1 part by mass.
- the kind of polymerization inhibitor is not specifically limited, It selects as needed.
- examples of the polymerization inhibitor include hydroquinone, methyl hydroquinone, hydroquinone monomethyl ether, butylhydroxytoluene and the like. These polymerization inhibitors may be used alone or in combination of two or more.
- the amount of the polymerization inhibitor used is not particularly limited, but is generally 0.01 to 5 parts by weight, preferably 0.1 to 5 parts when the amount of the resin (A) precursor is 100 parts by weight. 2 parts by mass, more preferably 0.2-1 part by mass.
- the resin (A) used in the present invention preferably has a weight average molecular weight obtained by gel permeation chromatography (GPC) in terms of polystyrene of 1,000 to 50,000, more preferably 3,000 to 40,000.
- GPC gel permeation chromatography
- a weight average molecular weight of 1000 or more is preferred because pattern chipping does not occur after alkali development.
- the weight average molecular weight is 50000 or less, it is preferable because the development time becomes an appropriate time and is practical in use.
- the weight average molecular weight of the resin (A) is preferably 3000 to 30000.
- the acid value (JIS K6901 5.3) of the resin (A) used in the present invention is not limited as long as the desired effect of the present invention is exhibited, but is usually 20 to 300 KOHmg / g, preferably 30 to 200 KOHmg / g. .
- An acid value of 20 KOH mg / g or more is preferable because developability is improved.
- an acid value of 300 KOH mg / g or less is preferable because the exposed portion (photocured portion) is difficult to dissolve in the alkali developer.
- the acid value of the resin (A) is preferably 30 to 200 KOHmg / g.
- the unsaturated group equivalent of the resin (A) used in the present invention is not limited as long as the desired effect of the present invention is exhibited, but is usually 100 to 4000 g / mol, preferably 200 to 2000 g / mol, more preferably Is 300 to 500 g / mol.
- An unsaturated group equivalent of 100 g / mol or more is preferable because it is effective in improving the physical properties of the coating film and alkali developability.
- an unsaturated group equivalent of 4000 g / mol or less is preferable because it is effective in increasing sensitivity.
- the unsaturated group equivalent of the resin (A) is preferably 200 to 2000 g / mol.
- the unsaturated group equivalent is the mass of the resin (A) per mole of unsaturated bonds (ethylenic carbon-carbon double bonds) in the resin (A).
- the unsaturated group equivalent can be determined by dividing the mass of the resin (A) by the number of unsaturated groups in the resin (A) (g / mol).
- the unsaturated group equivalent is a theoretical value calculated from the amount of raw material used for introducing the unsaturated group.
- the epoxy equivalent of the resin (A) used in the present invention is not limited as long as the desired effect of the present invention is exhibited, but is usually 100 to 4000 g / mol, preferably 200 to 2000 g / mol, and more preferably 300 ⁇ 500 g / mol.
- the epoxy equivalent is 100 g / mol or more, it is effective and preferable in improving the physical properties of the coating film and the storage stability.
- the epoxy equivalent is 4000 g / mol or less, it is effective to further improve the solvent resistance.
- the epoxy equivalent is the mass of the polymer per 1 mol of the epoxy group of the polymer. This value can be obtained by dividing the mass of the polymer by the amount of the epoxy group of the polymer (g / mol).
- “epoxy equivalent” is a theoretical value calculated from the amount of raw material used for introducing an epoxy group.
- the solvent (B) used in the present invention is not particularly limited as long as it is an inert solvent that can dissolve the resin (A) and does not react with the resin (A), and can be arbitrarily selected. Moreover, it is preferable that a solvent (B) has compatibility with the below-mentioned reactive diluent.
- the solvent (B) the same solvent that can be used when the resin (A) is produced can be used.
- (poly) alkylene glycol monoalkyl ethers such as propylene glycol monomethyl ether and (poly) alkylene glycol monoalkyl ether acetates such as propylene glycol monomethyl ether acetate are preferable.
- the solvent (B) can be appropriately added to the isolated resin (A) by isolating the target resin (A) from the resin (A) solution after completion of the copolymerization reaction. However, it is not always necessary to isolate the target resin (A) from the resin solution. The solvent contained at the end of the copolymerization reaction is not separated from the resin (A) solution, and the solvent can be used as it is as the solvent (B). You may add another solvent to a resin (A) solution as needed. Moreover, you may use the solvent contained in the other component used when preparing the photosensitive resin composition for black column spacer formation as a solvent (B) as it is.
- the photopolymerization initiator (C) used in the present invention is not particularly limited, and examples thereof include benzoin compounds such as benzoin, benzoin methyl ether, benzoin ethyl ether, and benzoin butyl ether; acetophenone, 2,2-dimethoxy-2-phenylacetophenone 1,1-dichloroacetophenone, 4- (1-t-butyldioxy-1-methylethyl) acetophenone, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholino-propan-1-one, An acetophenone compound such as benzyl-2-dimethylamino-1- (4-morpholinophenyl) butanone-1; an anthraquinone compound such as 2-methylanthraquinone, 2-amylanthraquinone, 2-t-butylanthraquinone, 1-chloroanthraquino
- the colorant (D) used in the present invention is not particularly limited as long as it is dissolved or dispersed in the solvent (B), and examples thereof include dyes and pigments.
- a dye and a pigment may be used alone, two or more kinds may be used, or a combination of a dye and a pigment may be used.
- the photosensitive resin composition for forming the black column spacer is black from the viewpoints of solubility in the solvent (B) and the alkaline developer, interaction with other components, and light shielding properties. It is preferable to include a pigment as the colorant (D).
- black pigments include inorganic black pigments and organic black pigments, and specific examples include aniline black, perylene black, titanium black, cyanine black, lignin black, lactam organic black, RGB black, and carbon black. These black pigments may be used alone or in combination of two or more. From the viewpoint of optical density, it is preferable to use an inorganic black pigment and an organic black pigment in combination, and it is more preferable to use carbon black and a lactam organic black in combination.
- a known dispersant may be added to the photosensitive resin composition for forming a black column spacer from the viewpoint of improving the dispersibility of the pigment.
- a polymer dispersant is preferably used because of excellent dispersion stability over time.
- the polymer dispersant can be arbitrarily selected, for example, urethane dispersant, polyethyleneimine dispersant, polyoxyethylene alkyl ether dispersant, polyoxyethylene glycol diester dispersant, sorbitan aliphatic ester dispersant, Aliphatic modified ester dispersant and the like.
- EFKA registered trademark, manufactured by BASF Japan
- Disperbyk registered trademark, manufactured by Big Chemie
- Disparon registered trademark, manufactured by Enomoto Kasei Co., Ltd.
- SOLPERSE registered trademark, manufactured by Geneca
- Preferred blending amounts of the resin (A), the solvent (B), the photopolymerization initiator (C), and the colorant (D) in the photosensitive resin composition for forming a black column spacer of the present invention are as follows.
- the blending amount of the resin (A) is preferably 1 to 20% by mass and more preferably 5 to 15% by mass with respect to the entire photosensitive resin composition. If the compounding amount of the resin (A) is 1% by mass or more, it is preferable because it has good photocurability. On the other hand, if the blending amount of the resin (A) is 20% by mass or less, it is preferable because it has good coatability.
- the blending amount of the solvent (B) is preferably 50 to 94% by mass and more preferably 60 to 90% by mass with respect to the entire photosensitive resin composition.
- a blending amount of the solvent (B) of 50% by mass or more is preferable because it has good coating properties.
- the compounding quantity of a solvent (B) is 94 mass% or less, since a sufficient film thickness can be given to a coating film, it is preferable.
- the blending amount of the photopolymerization initiator (C) is preferably 0.01 to 5% by mass, and more preferably 0.1 to 2% by mass with respect to the entire photosensitive resin composition.
- a blending amount of the photopolymerization initiator (C) of 0.01% by mass or more is preferable because the resist can be cured.
- the compounding quantity of a photoinitiator (C) is 5 mass% or less, since the residue after image development is hard to produce, it is preferable.
- the blending amount of the colorant (D) is preferably 3 to 30% by mass and more preferably 5 to 20% by mass with respect to the entire photosensitive resin composition.
- a blending amount of the colorant (D) of 3% by mass or more is preferable because it has light shielding properties.
- a blending amount of the colorant (D) of 30% by mass or less is preferable because a residue after development hardly occurs.
- the photosensitive resin composition for forming a black column spacer of the present invention can further contain a reactive diluent (E) from the viewpoints of viscosity adjustment and sensitivity adjustment.
- E reactive diluent
- the reactive diluent (E) is a compound having at least one ethylenically unsaturated group in the molecule. Of these, compounds having a plurality of ethylenically unsaturated groups are preferred.
- the reactive diluent (E) is not an essential component of the photosensitive resin composition for forming the black column spacer. However, by using the reactive diluent (E) together with the resin (A), the film strength of the coating film formed from the photosensitive resin composition for forming the black column spacer and the adhesion to the substrate are improved. Can do.
- Examples of the monofunctional monomer used as the reactive diluent (E) include (meth) acrylamide, methylol (meth) acrylamide, methoxymethyl (meth) acrylamide, ethoxymethyl (meth) acrylamide, propoxymethyl (meth) acrylamide, Butoxymethoxymethyl (meth) acrylamide, methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl ( (Meth) acrylate, 4-hydroxybutyl (meth) acrylate, 2-phenoxy-2-hydroxypropyl (meth) acrylate, 2- (meth) acryloyloxy-2-hydroxypropyl phthalate, Lysine mono (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, glycid
- Examples of the polyfunctional monomer used as the reactive diluent (E) include ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, tetraethylene glycol di (meth) acrylate, propylene glycol di (meth) acrylate, Polypropylene glycol di (meth) acrylate, butylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, 1,6-hexane glycol di (meth) acrylate, trimethylolpropane tri (meth) acrylate, glycerin di ( (Meth) acrylate, pentaerythritol di (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol penta (meth) acrylate, dipentaeryth Ritolol hexa (meth) acrylate, 2,2-bis (4
- These polyfunctional monomers may be used alone or in combination of two or more.
- the blending amount is preferably 1 to 20% by mass, and more preferably 2 to 10% by mass with respect to the entire photosensitive resin composition. If the amount of the reactive diluent (E) is 1% by mass or more, it is preferable because it has good curability. On the other hand, if the amount of the reactive diluent (E) is 20% by mass or less, a residue after development is less likely to occur, which is preferable.
- the photosensitive resin composition for forming a black column spacer of the present invention may contain a known additive such as a coupling agent, a leveling agent, a thermal polymerization inhibitor and the like within a range not impairing the effects of the present invention. .
- the amount of these additives is not particularly limited as long as the effects of the present invention are not impaired.
- the photosensitive resin composition for forming a black column spacer of the present invention can be produced by mixing the above-described components using a known mixing apparatus. Further, if desired, a composition containing a resin (A) and a solvent (B) is prepared in advance, and then a photopolymerization initiator (C), a colorant (D) and an optional reactive diluent (E) are added. In addition, it is also possible to manufacture by mixing.
- the black column spacer of the present invention is obtained by curing the above-described photosensitive resin composition for forming a black column spacer. Specifically, first, a photosensitive resin composition for forming a black column spacer is applied onto a substrate to form a resin layer (coating film). Thereafter, the resin layer is exposed through a halftone mask having a predetermined pattern, and the exposed portion is photocured. Then, the unexposed part and the half-exposed part are developed with an alkali developer to form a black column spacer. Thereafter, the black column spacer is post-baked as necessary.
- the material of the substrate is not particularly limited, and examples thereof include a glass substrate, a silicon substrate, a polycarbonate substrate, a polyester substrate, a polyamide substrate, a polyamideimide substrate, a polyimide substrate, an aluminum substrate, a printed wiring substrate, and an array substrate.
- the coating method of the photosensitive resin composition for forming the black column spacer is not particularly limited, and examples thereof include a screen printing method, a roll coating method, a curtain coating method, a spray coating method, and a spin coating method.
- the solvent (B) contained in the resin layer is heated by using a heating means such as a circulation oven, an infrared heater, or a hot plate, if necessary. ) May be volatilized.
- the heating conditions are not particularly limited, and may be appropriately set according to the composition of the photosensitive resin composition for forming a black column spacer to be used. In general, it is preferable to heat at a temperature of 50 ° C. to 120 ° C. for 30 seconds to 30 minutes.
- the exposure method of a resin layer is not specifically limited, For example, irradiation of active energy rays, such as an ultraviolet-ray and an excimer laser beam, is mentioned. What is necessary is just to set suitably the energy dose to irradiate according to the composition of the photosensitive resin composition for black column spacer formation. For example, it is preferably 30 to 2000 mJ / cm 2 , but is not limited to this range.
- the light source used for exposure is not particularly limited, and a low-pressure mercury lamp, a medium-pressure mercury lamp, a high-pressure mercury lamp, a xenon lamp, a metal halide lamp, or the like can be arbitrarily selected and used.
- the alkaline developer used for development is not particularly limited, and examples thereof include aqueous solutions of sodium carbonate, potassium carbonate, calcium carbonate, sodium hydroxide, potassium hydroxide, and the like; aqueous solutions of amine compounds such as ethylamine, diethylamine, dimethylethanolamine, and the like.
- Tetramethylammonium 3-methyl-4-amino-N, N-diethylaniline, 3-methyl-4-amino-N-ethyl-N- ⁇ -hydroxyethylaniline, 3-methyl-4-amino-N- P- such as ethyl-N- ⁇ -methanesulfonamidoethylaniline, 3-methyl-4-amino-N-ethyl-N- ⁇ -methoxyethylaniline and sulfates, hydrochlorides or p-toluenesulfonates thereof.
- examples thereof include an aqueous solution of a phenylenediamine compound.
- you may add an antifoamer, surfactant, etc. to these alkali developing solutions as needed. Further, it is preferable to wash with water and dry after development with an alkali developer.
- the resin can be further cured by post-baking the black column spacer formed by alkali development.
- the post-bake conditions are not particularly limited and can be arbitrarily selected.
- the heat treatment may be performed by selecting preferable conditions. For example, heating may be performed at a temperature of 130 ° C. to 250 ° C., preferably for 10 minutes to 4 hours, more preferably for 20 minutes to 2 hours.
- the black column spacer produced in this way is excellent in colorant dispersibility, solvent resistance and elastic recovery.
- the image display device of the present invention is an image display device including the above-described black column spacer.
- Specific examples of the image display device include a liquid crystal display device and an organic EL display device.
- the image display device there is no limitation except that the above-described black column spacer is formed, and the image display device can be manufactured according to a conventional method.
- Resin (A-1) contained in this resin solution had an acid value of 126 KOH mg / g, a weight average molecular weight of 10,000, and an unsaturated group equivalent of 1,100.
- Propylene glycol monomethyl ether acetate was further added to this resin solution to prepare a resin (A-1) solution (solid content concentration 40% by mass) of Synthesis Example 1.
- the solid content means a heating residue when the resin solution is heated at 130 ° C. for 2 hours, and the resin (A-1) and the polymerization initiator are the main components.
- Resin (A-2) contained in this resin solution had an acid value of 65 KOH mg / g, a weight average molecular weight of 9400, and an unsaturated group equivalent of 600.
- propylene glycol monomethyl ether acetate was added to prepare a resin (A-2) solution (solid content concentration of 40% by mass) of Synthesis Example 2.
- Resin (A-3) contained in this resin solution had an acid value of 100 KOH mg / g and a weight average molecular weight of 8,400.
- Propylene glycol monomethyl ether acetate was added in the same manner as in Synthesis Example 1 to prepare a resin (A-3) solution (solid content concentration 40% by mass) of Synthesis Example 3.
- Resin (A) solution a resin (A) solution.
- This resin is referred to as “resin (A-4)”.
- Resin (A-4) contained in this resin solution had an acid value of 85 KOH mg / g and a weight average molecular weight of 8,800.
- Propylene glycol monomethyl ether acetate was added in the same manner as in Synthesis Example 1 to prepare a resin (A-4) solution (solid content concentration 40% by mass) of Synthesis Example 4.
- Resin (A-5) This resin is referred to as “resin (A-5)”.
- Resin (A-5) contained in this resin solution had an acid value of 124 KOH mg / g, a weight average molecular weight of 10,000, and an unsaturated group equivalent of 600.
- Propylene glycol monomethyl ether acetate was added in the same manner as in Synthesis Example 1 to prepare a resin (A-5) solution (solid content concentration 40% by mass) of Synthesis Example 5.
- a resin (A) solution was obtained in the same manner as in Synthesis Example 1 except that the amount was changed to 1 g (0.17 mol). This resin is referred to as “resin (A-6)”. Resin (A-6) contained in this resin solution had an acid value of 125 KOH mg / g, a weight average molecular weight of 9,200, and an unsaturated group equivalent of 1,100. Propylene glycol monomethyl ether acetate was added in the same manner as in Synthesis Example 1 to prepare a resin (A-6) solution (solid content concentration 40% by mass) of Synthesis Example 6.
- the acid value, unsaturated group equivalent, and weight average molecular weight described in the synthesis examples are values obtained by the method described below.
- Acid value It is the acid value of the resin (A) measured using a mixed indicator of bromothymol blue and phenollet according to JIS K6901 5.3.2. It means the number of mg of potassium hydroxide required to neutralize the acidic component contained in 1 g of the resin (A).
- Unsaturated group equivalent The mass of the polymer per mole of polymerizable unsaturated bonds, and is a calculated value calculated based on the amount of monomer used.
- Weight average molecular weight Means a weight average molecular weight in terms of standard polystyrene measured under the following conditions using gel permeation chromatography (GPC).
- GPC gel permeation chromatography
- Flow rate 1mL / min
- Examples 1 to 10 and Comparative Examples 1 and 2 Using the resin solutions of Synthesis Examples 1 to 10 and Comparative Synthesis Example 1 and a commercially available resin solution, the black columns of Examples 1 to 10 and Comparative Examples 1 and 2 were formulated according to the formulations (mass% basis) shown in Tables 1 and 2 below. A photosensitive resin composition for spacer formation was prepared. Comparative Example 1 is an example corresponding to Patent Document 2. In addition, in the following mixing
- V259ME is a propylene glycol monomethyl ether acetate solution of fluorene type epoxy acrylate / acid anhydride polymerization adduct (56.5% by mass of resin component, etc.), V259ME manufactured by Nippon Steel Chemical Co., Ltd.
- PGMEA is propylene glycol monomethyl ether acetate
- OXE 01 is 1.2-octanedione
- Millbase 1 is a millbase containing lactam organic black (BASF)
- pigment concentration is 18% by mass
- Millbase 2 is a millbase containing carbon black
- pigment concentration is 25% by mass
- DPHA dipentaerythritol.
- A-DPH, KBM-403 is 3-glycidoxypropyl triethoxy silane, manufactured by Shin-Etsu Silicone Co. KBM-403.
- the colorant dispersibility was evaluated by the following method. First, the black column spacer-forming photosensitive resin compositions of Examples 1 to 10 and Comparative Examples 1 and 2 were spin-coated on a 10 cm ⁇ 10 cm IZO substrate so that the thickness of the coating film was 1.5 ⁇ m. . Thereafter, the solvent was volatilized by heating at 90 ° C. for 3 minutes. Next, the entire surface of the coating film was exposed (exposure amount 50 mJ / cm 2 ) using Multilight ML-251D / B and an irradiation optical unit PM25C-100 manufactured by USHIO INC. And photocured.
- the black column spacer produced by evaluation of the development margin was measured at 25 ° C. by using an elastic measuring device (DUH-W201S, Shimadzu Corporation) according to the following measurement conditions.
- a pressing body for pressing the pattern a flat pressing body having a diameter of 50 ⁇ m was used by a method of loading and unloading a load.
- the elastic recovery was measured in a test applying a load of 300 mN to obtain a distinguishable result between the groups compared.
- the load speed of 3 gf / second and the holding time of 3 seconds were kept constant.
- the elastic recovery rate means the ratio of the distance recovered after the lapse of the recovery time of 10 minutes to the distance compressed when a certain force is applied (compression displacement), which is expressed by the following equation.
- Elastic recovery rate (%) [(recovery distance / compression displacement) ⁇ 100] The results are shown in Tables 3 and 4.
- the photosensitive resin compositions for forming black column spacers of Examples 1 to 10 are excellent in colorant dispersibility, development margin, solvent resistance and elastic recovery.
- the photosensitive resin composition for forming a black column spacer of Comparative Example 1 is inferior in physical properties as a spacer because the spacer is destroyed when a load is applied in the elastic recovery rate test.
- the black column spacer forming photosensitive resin composition of Comparative Example 2 resulted in many color loss in the evaluation of solvent resistance.
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Abstract
Description
[1]カルボキシル基を有する構成単位(a)と(メタ)アクリロイルオキシ基を有する構成単位(b-1)及びカルボキシル基と反応する官能基を有する構成単位(b-2)からなる群から選択される少なくとも1種の構成単位とを有する樹脂(A)、溶剤(B)、光重合開始剤(C)並びに着色剤(D)を含有することを特徴とするブラックカラムスペーサ形成用感光性樹脂組成物。
[2]前記樹脂(A)が、芳香環骨格を有する構成単位(c)を更に有することを特徴とする[1]に記載のブラックカラムスペーサ形成用感光性樹脂組成物。
[3]前記樹脂(A)が、炭素原子数7~20の橋かけ脂環式炭化水素基を有する構成単位(d)を更に有することを特徴とする[1]又は[2]に記載のブラックカラムスペーサ形成用感光性樹脂組成物。
[4]前記芳香環骨格が、ビフェニル骨格、ナフタレン骨格及びアントラセン骨格からなる群から選択される少なくとも1種であることを特徴とする[2]に記載のブラックカラムスペーサ形成用感光性樹脂組成物。
[5]前記カルボキシル基と反応する官能基が、オキセタニル基、エポキシ基又はイソシアナト基の少なくとも1種の官能基であることを特徴とする[1]~[4]の何れかに記載のブラックカラムスペーサ形成用感光性樹脂組成物。
[6]前記カルボキシル基が、不飽和カルボン酸由来のカルボキシル基、多塩基酸由来のカルボキシル基又は多塩基酸無水物由来のカルボキシル基であることを特徴とする[1]~[5]の何れかに記載のブラックカラムスペーサ形成用感光性樹脂組成物。
[7]前記樹脂(A)の不飽和基当量が200~2000g/モルであることを特徴とする[1]~[6]の何れかに記載のブラックカラムスペーサ形成用感光性樹脂組成物。
[8]前記着色剤(D)が、無機黒色顔料と有機黒色顔料とを含むことを特徴とする[1]~[7]の何れかに記載のブラックカラムスペーサ形成用感光性樹脂組成物。
[9]前記樹脂(A)を1~20質量%、前記溶剤(B)を50~94質量%、前記光重合開始剤(C)を0.01~5質量%及び前記着色剤(D)を3~30質量%含有することを特徴とする[1]~[8]の何れかに記載のブラックカラムスペーサ形成用感光性樹脂組成物。
[10]反応性希釈剤(E)を1~20質量%更に含有することを特徴とする[9]に記載のブラックカラムスペーサ形成用感光性樹脂組成物。
[11][1]~[10]の何れかに記載のブラックカラムスペーサ形成用感光性樹脂組成物を硬化したことを特徴とするブラックカラムスペーサ。
[12][11]に記載のブラックカラムスペーサを備えることを特徴とする画像表示装置。
以下、本発明のブラックカラムスペーサ形成用感光性樹脂組成物について詳細に説明する。
本発明のブラックカラムスペーサ形成用感光性樹脂組成物は、カルボキシル基を有する構成単位(a)と(メタ)アクリロイルオキシ基を有する構成単位(b-1)及びカルボキシル基と反応する官能基を有する構成単位(b-2)からなる群から選択される少なくとも1種の構成単位とを有する樹脂(A)、溶剤(B)、光重合開始剤(C)並びに着色剤(D)を含有する。
本発明で用いる樹脂(A)は、カルボキシル基を有する構成単位(a)と、(メタ)アクリロイルオキシ基を有する構成単位(b-1)及びカルボキシル基と反応する官能基を有する構成単位(b-2)からなる群から選択される少なくとも1種の構成単位とを有する。本明細書において、「構成単位」とは、樹脂(A)の主鎖を形成するモノマー単位を意味する。更に、樹脂(A)の主鎖を形成するモノマー単位に別のモノマーが付加して側鎖を形成している場合には、主鎖のモノマー単位と側鎖を形成するモノマー単位とを合わせて一つの「構成単位」とする。従って、本発明で用いる樹脂(A)には、一つの構成単位中にカルボキシル基と(メタ)アクリロイルオキシ基とを有するものも含まれる。なお、本明細書において、一つの構成単位中にカルボキシル基と(メタ)アクリロイルオキシ基とを有する場合には、構成単位(a、b-1)と表記することがある。
(I)カルボキシル基を有する構成単位(a)と(メタ)アクリロイルオキシ基を有する構成単位(b-1)とを有する樹脂(A)は、10~70モル%の構成単位(a)と10~80モル%の構成単位(b-1)とを有することが好ましく、20~60モル%の構成単位(a)と15~70モル%の構成単位(b-1)とを有することがより好ましい。
(II)カルボキシル基を有する構成単位(a)とカルボキシル基と反応する官能基を有する構成単位(b-2)とを有する樹脂(A)は、10~80モル%の構成単位(a)と10~70モル%の構成単位(b-2)とを有することが好ましく、20~70モル%の構成単位(a)と15~60モル%の構成単位(b-2)とを有することがより好ましい。
(III)カルボキシル基を有する構成単位(a)と(メタ)アクリロイルオキシ基を有する構成単位(b-1)とカルボキシル基と反応する官能基を有する構成単位(b-2)とを有する樹脂(A)は、10~70モル%の構成単位(a)と10~70モル%の構成単位(b-1)と10~50モル%の構成単位(b-2)とを有することが好ましく、20~60モル%の構成単位(a)と20~60モル%の構成単位(b-1)と20~40モル%の構成単位(b-2)とを有することがより好ましい。
(IV)カルボキシル基と(メタ)アクリロイルオキシ基とを有する構成単位(a、b-1)と(メタ)アクリロイルオキシ基を有する構成単位(b-1)とカルボキシル基と反応する官能基を有する構成単位(b-2)とを有する樹脂(A)は、10~80モル%の構成単位(a、b-1)と10~80モル%の構成単位(b-1)と1~10モル%の構成単位(b-2)を有することが好ましく、20~70モル%の構成単位(a、b-1)と15~70モル%の構成単位(b-1)と1~5モル%の構成単位(b-2)を有することがより好ましい。
(メタ)アクリロイルオキシ基を有する構成単位(b-1)が10モル%以上であれば、耐溶剤性、現像性が良好になるため好ましい。一方、(メタ)アクリロイルオキシ基を有する構成単位(b-1)の比率が前記上限値以下であれば、現像時の残渣の発生を抑止できるため好ましい。
カルボキシル基と反応する官能基を有する構成単位(b-2)が10モル%以上であれば、耐溶剤性が良好となるため好ましい。一方、カルボキシル基と反応する官能基を有する構成単位(b-2)の比率が前記上限値以下であれば、保存安定性が良好となるため好ましい。
芳香環骨格を有する構成単位(c)を導入する場合、樹脂(A)の構成単位の0モル%超~50モル%であることが好ましく、0モル%超~40モル%であることがより好ましい。
炭素原子数7~20の橋かけ脂環式炭化水素基を有する構成単位(d)を導入する場合、樹脂(A)の構成単位の0モル%超~40モル%であることが好ましく、0モル%超~30モル%であることがより好ましい。
それ以外の構成単位を導入する場合、樹脂(A)の構成単位の0モル%超~60モル%であることが好ましく、0モル%超~50モル%であることがより好ましい。
本発明で用いる溶剤(B)は、樹脂(A)を溶解することができ且つ樹脂(A)と反応しない不活性な溶剤であれば特に限定されず、任意に選択することができる。また、溶剤(B)は、後述の反応性希釈剤と相溶性を有することが好ましい。溶剤(B)としては、樹脂(A)を製造する際に用いることができる溶媒と同じものを用いることができる。溶剤(B)としては、プロピレングリコールモノメチルエーテル等の(ポリ)アルキレングリコールモノアルキルエーテル及びプロピレングリコールモノメチルエーテルアセテート等の(ポリ)アルキレングリコールモノアルキルエーテルアセテートが好ましい。
本発明で用いる光重合開始剤(C)としては、特に限定されないが、例えば、ベンゾイン、ベンゾインメチルエーテル、ベンゾインエチルエーテル、ベンゾインブチルエーテル等のベンゾイン化合物;アセトフェノン、2,2-ジメトキシ-2-フェニルアセトフェノン、1,1-ジクロロアセトフェノン、4-(1-t-ブチルジオキシ-1-メチルエチル)アセトフェノン、2-メチル-1-[4-(メチルチオ)フェニル]-2-モルホリノ-プロパン-1-オン、2-ベンジル-2-ジメチルアミノ-1-(4-モルホリノフェニル)ブタノン-1等のアセトフェノン化合物;2-メチルアントラキノン、2-アミルアントラキノン、2-t-ブチルアントラキノン、1-クロロアントラキノン等のアントラキノン化合物;キサントン、チオキサントン、2,4-ジメチルチオキサントン、2,4-ジイソプロピルチオキサントン、2-クロロチオキサントン等のキサントン化合物;アセトフェノンジメチルケタール、ベンジルジメチルケタール等のケタール化合物;ベンゾフェノン、4-(1-t-ブチルジオキシ-1-メチルエチル)ベンゾフェノン、3,3’,4,4’-テトラキス(t-ブチルジオキシカルボニル)ベンゾフェノン等のベンゾフェノン化合物;アシルホスフィンオキサイド化合物等が挙げられる。これらの光重合開始剤は、単独で用いてもよいし、又は2種以上を用いてもよい。
本発明で用いる着色剤(D)は、溶剤(B)に溶解又は分散するものであれば特に限定されないが、例えば、染料及び顔料が挙げられる。染料及び顔料は、単独で用いてもよいし、2種以上を用いてもよいし、又は染料と顔料とを組み合わせて用いてもよい。本発明のブラックカラムスペーサを形成する場合、ブラックカラムスペーサ形成用感光性樹脂組成物は、溶剤(B)及びアルカリ現像液に対する溶解性、他の成分との相互作用並びに遮光性の観点から、黒色顔料を着色剤(D)として含むことが好ましい。
樹脂(A)の配合量は、感光性樹脂組成物全体に対して、1~20質量%であることが好ましく、5~15質量%であることがより好ましい。樹脂(A)の配合量が1質量%以上であれば、良好な光硬化性を有するため好ましい。一方、樹脂(A)の配合量が20質量%以下であれば、良好な塗布性を有するため好ましい。
溶剤(B)の配合量は、感光性樹脂組成物全体に対して、50~94質量%であることが好ましく、60~90質量%であることがより好ましい。溶剤(B)の配合量が50質量%以上であれば、良好な塗布性を有するため好ましい。一方、溶剤(B)の配合量が94質量%以下であれば、塗膜に十分な膜厚を持たせられるため好ましい。
光重合開始剤(C)の配合量は、感光性樹脂組成物全体に対して、0.01~5質量%であることが好ましく、0.1~2質量%であることがより好ましい。光重合開始剤(C)の配合量が0.01質量%以上であれば、レジストに硬化性を持たせられるため好ましい。一方、光重合開始剤(C)の配合量が5質量%以下であれば、現像後の残渣が生じにくいため好ましい。
着色剤(D)の配合量は、感光性樹脂組成物全体に対して、3~30質量%であることが好ましく、5~20質量%であることがより好ましい。着色剤(D)の配合量が3質量%以上であれば、遮光性を有するため好ましい。一方、着色剤(D)の配合量が30質量%以下であれば、現像後の残渣が生じにくいため好ましい。
反応性希釈剤(E)は、分子内に少なくとも一つのエチレン性不飽和基を有する化合物である。中でもエチレン性不飽和基を複数有する化合物が好ましい。反応性希釈剤(E)は、ブラックカラムスペーサ形成用感光性樹脂組成物の必須成分ではない。しかしながら、反応性希釈剤(E)を樹脂(A)と併用することにより、ブラックカラムスペーサ形成用感光性樹脂組成物から形成される塗膜の膜強度や、基材に対する密着性を向上させることができる。
次に、本発明のブラックカラムスペーサについて詳細に説明する。
本発明のブラックカラムスペーサは、上述のブラックカラムスペーサ形成用感光性樹脂組成物を硬化したものである。具体的には、まず、ブラックカラムスペーサ形成用感光性樹脂組成物を基板上に塗布して樹脂層(塗布膜)を形成する。その後、所定のパターンのハーフトーンマスクを介して、樹脂層を露光して、露光部分を光硬化させる。そして、未露光部分及び半露光部をアルカリ現像液で現像してブラックカラムスペーサを形成する。その後、必要に応じて、ブラックカラムスペーサをポストベークする。
本発明の画像表示装置は、上述のブラックカラムスペーサを備える画像表示装置である。画像表示装置の具体例としては、液晶表示装置、有機EL表示装置等が挙げられる。画像表示装置を製造するにあたっては、上述のブラックカラムスペーサを形成すること以外は制限はなく、常法に従って製造を行うことができる。
攪拌装置、滴下ロート、コンデンサー、温度計及びガス導入管を備えたフラスコに、溶媒としてプロピレングリコールモノメチルエーテルアセテート139gを加え、フラスコ内を窒素ガス置換しながら攪拌し、120℃に昇温させた。
次いで、トリシクロデカニルメタクリレート 22.0g(0.1モル)、ベンジルメタクリレート 70.0g(0.4モル)及びメタクリル酸 43.0g(0.5モル)からなるモノマー混合物に、t-ブチルパーオキシ-2-エチルヘキサノエート(重合開始剤、日油株式会社製、パーブチル(登録商標)O) 6.6gを添加したものを別途用意した。このモノマー及び重合開始剤の混合物を、滴下ロートから2時間にわたってフラスコ中に滴下した。滴下終了後、120℃で更に2時間攪拌して共重合反応を行い、樹脂(A)の前駆体を合成した。その後、フラスコ内を空気に置換して、グリシジルメタクリレート 21.3g(0.15モル)、トリフェニルホスフィン(触媒) 0.5g及びブチルヒドロキシトルエン(重合禁止剤) 0.5gを、上記の樹脂(A)前駆体溶液中に投入した。その後、110℃で10時間にわたり反応を続けて、樹脂(A)の溶液を得た。この樹脂を「樹脂(A-1)」とする。この樹脂溶液中に含まれる樹脂(A-1)の酸価は126KOHmg/gであり、重量平均分子量は10000、不飽和基当量は1100であった。
この樹脂溶液にプロピレングリコールモノメチルエーテルアセテートを更に添加して、合成例1の樹脂(A-1)溶液(固形分濃度40質量%)を調製した。なお、固形分とは、樹脂溶液を130℃で2時間加熱したときの加熱残分を意味し、樹脂(A-1)と重合開始剤とが主成分となる。
攪拌装置、滴下ロート、コンデンサー、温度計及びガス導入管を備えたフラスコに、溶媒としてプロピレングリコールモノメチルエーテルアセテート140gを加え、フラスコ内を窒素ガス置換しながら攪拌し、120℃に昇温させた。
次いで、トリシクロデカニルメタクリレート 66.0g(0.3モル)、スチレン 31.2g(0.3モル)及びグリシジルメタクリレート 56.8g(0.4モル)からなるモノマー混合物に、t-ブチルパーオキシ-2-エチルヘキサノエート(重合開始剤、日油株式会社製、パーブチル(登録商標)O) 7.3gを添加したものを別途用意した。このモノマー及び重合開始剤の混合物を、滴下ロートから2時間にわたってフラスコ中に滴下した。滴下終了後、120℃で更に2時間攪拌して共重合反応を行い、樹脂(A)の前駆体を生成させた。その後、フラスコ内を空気に置換して、アクリル酸 28.8g(0.4モル)、トリフェニルホスフィン(触媒) 0.6g及びブチルヒドロキシトルエン(重合禁止剤) 0.6gを、上記の樹脂(A)前駆体溶液中に投入した。その後、110℃で10時間にわたり反応を続けた。次いで、フラスコ内にテトラヒドロフタル酸無水物 38.0g(0.25モル)を添加し、110℃で3時間にわたり反応を続けて、樹脂(A)の溶液を得た。この樹脂を「樹脂(A-2)」とする。この樹脂溶液中に含まれる樹脂(A-2)の酸価は65KOHmg/gであり、重量平均分子量は9400、不飽和基当量は600であった。合成例1と同様にプロピレングリコールモノメチルエーテルアセテートを添加して、合成例2の樹脂(A-2)溶液(固形分濃度40質量%)を調製した。
攪拌装置、滴下ロート、コンデンサー、温度計及びガス導入管を備えたフラスコに、溶媒としてプロピレングリコールモノメチルエーテルアセテート 191gを加え、フラスコ内を窒素ガス置換しながら攪拌し、100℃に昇温させた。
次いで、トリシクロデカニルメタクリレート 22.0g(0.1モル)、メチルメタクリレート 50.0g(0.5モル)、メタクリル酸 21.5g(0.25モル)及びグリシジルメタクリレート 21.3g(0.15モル)からなるモノマー混合物に、アゾビスイソブチロニトリル 12.6gを添加したものを別途用意した。このモノマー及び重合開始剤の混合物を、滴下ロートから2時間にわたってフラスコ中に滴下した。滴下終了後、100℃で更に2時間攪拌して共重合反応を行い、樹脂(A)の溶液を得た。この樹脂を「樹脂(A-3)」とする。この樹脂溶液中に含まれる樹脂(A-3)の酸価は100KOHmg/gであり、重量平均分子量は8400であった。合成例1と同様にプロピレングリコールモノメチルエーテルアセテートを添加して、合成例3の樹脂(A-3)溶液(固形分濃度40質量%)を調製した。
攪拌装置、滴下ロート、コンデンサー、温度計及びガス導入管を備えたフラスコに、溶媒としてプロピレングリコールモノメチルエーテルアセテート 226gを加え、フラスコ内を窒素ガス置換しながら攪拌し、70℃に昇温させた。
次いで、トリシクロデカニルメタクリレート 22.0g(0.1モル)、メチルメタクリレート 50.0g(0.5モル)、メタクリル酸 21.5g(0.25モル)及び2-イソシアナトエチルメタアクリレートとε-カプロラクタムとの反応生成物 40.2g(0.15モル)からなるモノマー混合物に、2,2’-アゾビス(2,4-ジメチルバレロニトリル)(重合開始剤、和光純薬工業株式会社製、V-65) 13.0gを添加したものを別途用意した。このモノマー及び重合開始剤の混合物を、滴下ロートから2時間にわたってフラスコ中に滴下した。滴下終了後、70℃で更に2時間攪拌して共重合反応を行い、樹脂(A)の溶液を得た。この樹脂を「樹脂(A-4)」とする。この樹脂溶液中に含まれる樹脂(A-4)の酸価は85KOHmg/gであり、重量平均分子量は8800であった。合成例1と同様にプロピレングリコールモノメチルエーテルアセテートを添加して、合成例4の樹脂(A-4)溶液(固形分濃度40質量%)を調製した。
モノマー及び重合開始剤の混合物として、トリシクロデカニルメタクリレート 41.8g(0.19モル)、ベンジルメタクリレート 24.6g(0.14モル)、メタクリル酸 57.6g(0.67モル)及びt-ブチルパーオキシ-2-エチルヘキサノエート(重合開始剤、日油株式会社製、パーブチル(登録商標)O) 12.4gからなる混合物を用い、グリシジルメタクリレートの添加量を42.6g(0.3モル)に変更した以外は合成例1と同様にして樹脂(A)の溶液を得た。この樹脂を「樹脂(A-5)」とする。この樹脂溶液中に含まれる樹脂(A-5)の酸価は124KOHmg/gであり、重量平均分子量は10000、不飽和基当量は600であった。合成例1と同様にプロピレングリコールモノメチルエーテルアセテートを添加して、合成例5の樹脂(A-5)溶液(固形分濃度40質量%)を調製した。
モノマー及び重合開始剤の混合物として、トリシクロデカニルメタクリレート 52.8g(0.24モル)、エトキシ化o-フェニルフェノールアクリレート 53.6g(0.2モル)、メタクリル酸 48.2g(0.56モル)及びt-ブチルパーオキシ-2-エチルヘキサノエート(重合開始剤、日油株式会社製、パーブチル(登録商標)O) 5.7gからなる混合物を用い、グリシジルメタクリレートの添加量を24.1g(0.17モル)に変更した以外は合成例1と同様にして樹脂(A)の溶液を得た。この樹脂を「樹脂(A-6)」とする。この樹脂溶液中に含まれる樹脂(A-6)の酸価は125KOHmg/gであり、重量平均分子量は9200、不飽和基当量は1100であった。合成例1と同様にプロピレングリコールモノメチルエーテルアセテートを添加して、合成例6の樹脂(A-6)溶液(固形分濃度40質量%)を調製した。
t-ブチルパーオキシ-2-エチルヘキサノエート(重合開始剤、日油株式会社製、パーブチル(登録商標)O)の添加量を4.7gに変更した以外は合成例2と同様にして樹脂(A)の溶液を得た。この樹脂を「樹脂(A-7)」とする。この樹脂溶液中に含まれる樹脂(A-7)の酸価は65KOHmg/gであり、重量平均分子量は15000、不飽和基当量は600であった。
t-ブチルパーオキシ-2-エチルヘキサノエート(重合開始剤、日油株式会社製、パーブチル(登録商標)O)の添加量を2.3gに変更した以外は合成例2と同様にして樹脂(A)の溶液を得た。この樹脂を「樹脂(A-8)」とする。この樹脂溶液中に含まれる樹脂(A-8)の酸価は65KOHmg/gであり、重量平均分子量は30000、不飽和基当量は600であった。
モノマー及び重合開始剤の混合物として、トリシクロデカニルメタクリレート 39.6g(0.18モル)、メチルメタクリレート 57.0g(0.57モル)、メタクリル酸 7.7g(0.09モル)、グリシジルメタクリレート 22.7g(0.16モル)及びアゾビスイソブチロニトリル 14.0gからなる混合物を用いた以外は合成例3と同様にして樹脂(A)の溶液を得た。この樹脂を「樹脂(A-9)」とする。この樹脂溶液中に含まれる樹脂(A-9)の酸価は30KOHmg/gであり、重量平均分子量は8500であった。
モノマー及び重合開始剤の混合物として、トリシクロデカニルメタクリレート 22.0g(0.1モル)、メチルメタクリレート 42.0g(0.42モル)、2-エチルヘキシルアクリレート 11.0g(0.06モル)、メタクリル酸 22.4g(0.26モル)、グリシジルメタクリレート 22.7g(0.16モル)及びアゾビスイソブチロニトリル 13.2gからなる混合物を用いた以外は合成例3と同様にして樹脂(A)の溶液を得た。この樹脂を「樹脂(A-10)」とする。この樹脂溶液中に含まれる樹脂(A-10)の酸価は100KOHmg/gであり、重量平均分子量は8700であった。
(1)共重合体の調製
N-フェニルマレイミド 64.1g、メタクリル酸 18.8g、グリシジルメタクリレート 10.3g及びスチレン 6.8gからなるモノマー混合物、溶媒としてのプロピレングリコールモノメチルエーテルアセテート 300g並びにラジカル重合開始剤としての2,2’-アゾビス(2,4-ジメチルバレロニトリル) 2gを、還流冷却器及び撹拌機を装備した500mL丸底フラスコの中に入れた。温度を70℃まで上昇させ、共重合体を生成する重合のために混合物を5時間撹拌した。このようにして生成した共重合体の酸価は80KOHmg/gであり、重量平均分子量は11000であった。
スピロ[フルオレン-9,9’-キサンテン]-3’,6’-ジオール 125.4g及びt-ブチルアンモニウムブロミド 0.1386gを、3000mL丸底フラスコに入れて混合した。エピクロロヒドリン 78.6gを更に添加し、混合物を90℃に加熱して反応を実施した。液体クロマトグラフィー分析により、スピロ[フルオレン-9,9’-キサンテン]-3’,6’-ジオールの完全な消費を確認した後、反応体を30℃に冷却し、50% NaOH水溶液(3当量)をゆっくりと添加した。液体クロマトグラフィー分析により、エピクロロヒドリンの完全な消費を確認した後、ジクロロメタンを用いて反応体を抽出し、3回洗浄した。有機層を、硫酸マグネシウムを用いて乾燥させ、ジクロロメタンを減圧下で留去した。ジクロロメタンとメタノールとの混合物溶媒(50:50、v/v)を用いて粗生成物を結晶化させた。
(1)で得られた共重合体と(2)で得られたキサンテン骨格構造を有する化合物とを固形分比が6:4となるように混合して、比較合成例1の樹脂溶液を調製した。
合成例に記載された、酸価、不飽和基当量及び重量平均分子量は、以下に記載する方法によって得られた値である。
(1)酸価:JIS K6901 5.3.2に従ってブロモチモールブルーとフェノールレットの混合指示薬を用いて測定された樹脂(A)の酸価である。樹脂(A)1g中に含まれる酸性成分を中和するのに要する水酸化カリウムのmg数を意味する。
(2)不飽和基当量:重合性不飽和結合のモル数当たりの重合体の質量であり、モノマーの使用量に基づいて算出した計算値である。
(3)重量平均分子量(Mw):ゲルパーミエーションクロマトグラフィー(GPC)を用いて、下記条件にて測定した標準ポリスチレン換算した重量平均分子量を意味する。
カラム:ショウデックス(登録商標) LF-804+LF-804(昭和電工株式会社製)
カラム温度:40℃
試料:共重合体の0.2%テトラヒドロフラン溶液
展開溶媒:テトラヒドロフラン
検出器:示差屈折計(ショウデックス(登録商標) RI-71S)(昭和電工株式会社製)
流速: 1mL/min
合成例1~10、比較合成例1の樹脂溶液及び市販の樹脂溶液を用いて、下記表1及び2の配合(質量%基準)により、実施例1~10及び比較例1~2のブラックカラムスペーサ形成用感光性樹脂組成物を調製した。比較例1は、特許文献2に対応する例である。なお、下記配合において、樹脂(A)の量には、調製時に用いた溶剤は含まれない。樹脂(A)の溶液に含まれていた溶剤の量は、配合成分としての溶剤(B)の中に合算されている。表1及び2中、V259MEは、フルオレン型エポキシ型アクリレート/酸無水物重合付加体のプロピレングリコールモノメチルエーテルアセテート溶液(樹脂成分等56.5質量%)、新日鐵化学株式会社製V259MEであり、PGMEAは、プロピレングリコールモノメチルエーテルアセテートであり、OXE 01は、1.2-オクタンジオン,1-[4-(フェニルチオ)-,2-(O-ベンゾイルオキシム)]、BASF社製IRGACURE OXE 01であり、ミルベース1は、ラクタム系有機ブラック(BASF社製)を含むミルベース、顔料濃度18質量%であり、ミルベース2は、カーボンブラックを含むミルベース、顔料濃度25質量%であり、DPHAは、ジペンタエリスリトールヘキサアクリレート、新中村工業株式会社製A-DPHであり、KBM-403は、3-グリシドキシプロピルトリエトキシシラン、信越シリコーン製KBM-403である。
以下に示す方法により着色剤分散性を評価した。
まず、実施例1~10及び比較例1~2のブラックカラムスペーサ形成用感光性樹脂組成物を10cm×10cmのIZO基板上に、塗膜の厚さが1.5μmとなるようにスピンコートした。この後、90℃で3分間加熱することにより溶剤を揮発させた。次に、塗膜の全面をウシオ電機株式会社製マルチライトML-251D/Bと照射光学ユニットPM25C-100を用いて露光(露光量50mJ/cm2)し、光硬化させた。その後、0.2質量%の水酸化カリウム水溶液で120秒間現像し、更に230℃で30分間ポストベークすることで、目的とする硬化塗膜を得た。透過濃度計(361T、X-lite社)を用いることにより、厚さ1μmの硬化塗膜についての光学密度(Optical Density:OD)を測定した。結果を表2に示す。光学密度が高いほど着色剤分散性に優れているといえる。
光学密度と同様の方法で基板上に2.5μmの塗膜を作製し現像時間100秒から150秒の間の塗膜の厚さの減少率を小坂研究所製触針式段差計T4000Mを用いて測定した。結果を表2に示す。塗膜の厚さの減少率が大きいほど優れた現像マージンを有しているといえる。
光学密度の評価に使用したブラックカラムスペーササンプルを基材から剥離し、1cm×1cmの大きさに切断してN-メチルピロリドン5mLが入っているガラス瓶に入れ、100℃のオーブン中で15分間放置した後、色抜けの有無を下記基準に従って評価した。結果を表2に示す。
○:肉眼で観察時、色抜けが全くない
×:肉眼で観察時、色抜けが非常に多い
現像マージンの評価で作製したブラックカラムスペーサを25℃において、圧縮変位及び弾性回復率を、弾性測定装置(DUH-W201S、株式会社島津製作所)を以下の測定条件に従って用いることにより測定した。
パターンを押す押圧体として、50μmの直径を有する平らな押圧体を、荷重を負荷-除荷する方法で用いた。弾性回復率は、比較した群間で識別可能な結果を得るために300mNの荷重を加える試験で測定した。3gf/秒の荷重速度及び3秒の保持時間を一定に維持した。弾性回復率に関して、平らな押圧体に3秒間一定に荷重をかけ、次に、荷重前後のパターンの実際の弾性回復率を、三次元厚さ測定装置を用いることにより測定した。弾性回復率は、10分の回復時間の経過後に回復した距離の、一定の力を加えた際に圧縮された距離(圧縮変位)に対する比を意味し、それは次式で表される。
弾性回復率(%)=[(回復距離/圧縮変位)×100]
結果を表3及び4に示す。
Claims (12)
- カルボキシル基を有する構成単位(a)と(メタ)アクリロイルオキシ基を有する構成単位(b-1)及びカルボキシル基と反応する官能基を有する構成単位(b-2)からなる群から選択される少なくとも1種の構成単位とを有する樹脂(A)、溶剤(B)、光重合開始剤(C)並びに着色剤(D)を含有することを特徴とするブラックカラムスペーサ形成用感光性樹脂組成物。
- 前記樹脂(A)が、芳香環骨格を有する構成単位(c)を更に有することを特徴とする請求項1に記載のブラックカラムスペーサ形成用感光性樹脂組成物。
- 前記樹脂(A)が、炭素原子数7~20の橋かけ脂環式炭化水素基を有する構成単位(d)を更に有することを特徴とする請求項1又は2に記載のブラックカラムスペーサ形成用感光性樹脂組成物。
- 前記芳香環骨格が、ビフェニル骨格、ナフタレン骨格及びアントラセン骨格からなる群から選択される少なくとも1種であることを特徴とする請求項2に記載のブラックカラムスペーサ形成用感光性樹脂組成物。
- 前記カルボキシル基と反応する官能基が、オキセタニル基、エポキシ基又はイソシアナト基の少なくとも1種の官能基であることを特徴とする請求項1~4の何れか一項に記載のブラックカラムスペーサ形成用感光性樹脂組成物。
- 前記カルボキシル基が、不飽和カルボン酸由来のカルボキシル基、多塩基酸由来のカルボキシル基又は多塩基酸無水物由来のカルボキシル基であることを特徴とする請求項1~5の何れか一項に記載のブラックカラムスペーサ形成用感光性樹脂組成物。
- 前記樹脂(A)の不飽和基当量が200~2000g/モルであることを特徴とする請求項1~6の何れか一項に記載のブラックカラムスペーサ形成用感光性樹脂組成物。
- 前記着色剤(D)が、無機黒色顔料と有機黒色顔料とを含むことを特徴とする請求項1~7の何れか一項に記載のブラックカラムスペーサ形成用感光性樹脂組成物。
- 前記樹脂(A)を1~20質量%、前記溶剤(B)を50~94質量%、前記光重合開始剤(C)を0.01~5質量%及び前記着色剤(D)を3~30質量%含有することを特徴とする請求項1~8の何れか一項に記載のブラックカラムスペーサ形成用感光性樹脂組成物。
- 反応性希釈剤(E)を1~20質量%更に含有することを特徴とする請求項9に記載のブラックカラムスペーサ形成用感光性樹脂組成物。
- 請求項1~10の何れか一項に記載のブラックカラムスペーサ形成用感光性樹脂組成物を硬化したことを特徴とするブラックカラムスペーサ。
- 請求項11に記載のブラックカラムスペーサを備えることを特徴とする画像表示装置。
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WO2022124052A1 (ja) * | 2020-12-11 | 2022-06-16 | 昭和電工株式会社 | 感光性樹脂組成物及び感光性樹脂組成物の製造方法 |
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TW201809884A (zh) | 2018-03-16 |
JPWO2017204079A1 (ja) | 2019-03-22 |
KR20190008555A (ko) | 2019-01-24 |
KR102146622B1 (ko) | 2020-08-20 |
TWI643022B (zh) | 2018-12-01 |
CN109154748A (zh) | 2019-01-04 |
CN109154748B (zh) | 2021-07-16 |
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