WO2014175275A1 - 新規脂環式エステル化合物、(メタ)アクリル共重合体およびそれを含む感光性樹脂組成物 - Google Patents
新規脂環式エステル化合物、(メタ)アクリル共重合体およびそれを含む感光性樹脂組成物 Download PDFInfo
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- WO2014175275A1 WO2014175275A1 PCT/JP2014/061316 JP2014061316W WO2014175275A1 WO 2014175275 A1 WO2014175275 A1 WO 2014175275A1 JP 2014061316 W JP2014061316 W JP 2014061316W WO 2014175275 A1 WO2014175275 A1 WO 2014175275A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/26—Esters containing oxygen in addition to the carboxy oxygen
- C08F220/28—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety
- C08F220/283—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety and containing one or more carboxylic moiety in the chain, e.g. acetoacetoxyethyl(meth)acrylate
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/24—Preparation of carboxylic acid esters by reacting carboxylic acids or derivatives thereof with a carbon-to-oxygen ether bond, e.g. acetal, tetrahydrofuran
- C07C67/26—Preparation of carboxylic acid esters by reacting carboxylic acids or derivatives thereof with a carbon-to-oxygen ether bond, e.g. acetal, tetrahydrofuran with an oxirane ring
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C69/00—Esters of carboxylic acids; Esters of carbonic or haloformic acids
- C07C69/74—Esters of carboxylic acids having an esterified carboxyl group bound to a carbon atom of a ring other than a six-membered aromatic ring
- C07C69/757—Esters of carboxylic acids having an esterified carboxyl group bound to a carbon atom of a ring other than a six-membered aromatic ring having any of the groups OH, O—metal, —CHO, keto, ether, acyloxy, groups, groups, or in the acid moiety
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- 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
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/039—Macromolecular compounds which are photodegradable, e.g. positive electron resists
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/039—Macromolecular compounds which are photodegradable, e.g. positive electron resists
- G03F7/0392—Macromolecular compounds which are photodegradable, e.g. positive electron resists the macromolecular compound being present in a chemically amplified positive photoresist composition
- G03F7/0397—Macromolecular compounds which are photodegradable, e.g. positive electron resists the macromolecular compound being present in a chemically amplified positive photoresist composition the macromolecular compound having an alicyclic moiety in a side chain
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C2603/00—Systems containing at least three condensed rings
- C07C2603/56—Ring systems containing bridged rings
- C07C2603/58—Ring systems containing bridged rings containing three rings
- C07C2603/70—Ring systems containing bridged rings containing three rings containing only six-membered rings
- C07C2603/74—Adamantanes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/26—Esters containing oxygen in addition to the carboxy oxygen
- C08F220/28—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety
- C08F220/285—Esters containing oxygen in addition to the carboxy oxygen containing no aromatic rings in the alcohol moiety and containing a polyether chain in the alcohol moiety
Definitions
- the present invention excels in optical materials such as resists for KrF, ArF and F2 excimer lasers, chemically amplified resists for X-rays, electron beams, EUV (extreme ultraviolet light), and heat resistance, chemical resistance and light transmittance.
- the present invention relates to a novel alicyclic ester compound, a (meth) acrylic copolymer and a photosensitive resin composition containing the same that can be used as raw materials for various resin compositions for industrial use.
- Photolithography is widely used in the manufacture of various electronic devices. Photolithography has promoted miniaturization by shortening the wavelength of the light source.
- a chemically amplified resist is generally used, and its composition is generally composed of a functional resin as a main ingredient and a photoacid generator, as well as several additions. It is a solution containing an agent.
- the functional resin which is the main agent, is important to have a good balance of characteristics such as etching resistance, adhesion to the substrate, transparency to the light source used, and development speed, which determine resist performance. .
- the functional resin used in the photoresist for KrF excimer laser is generally a polymer having a vinyl compound or acrylate as a repeating unit.
- hydroxystyrene-based resins have been proposed for KrF excimer laser lithography resists (Patent Document 1)
- ArF excimer laser lithography resists acrylic resins having adamantyl (meth) acrylate as a basic skeleton have been proposed (Patent Document 2). 6)
- the basic skeleton is being determined. However, it is not used in a single repeating unit. This is because a single repeating unit cannot satisfy all the characteristics such as etching resistance.
- a plurality of repeating units having a functional group for improving each property that is, two or more types are used as a copolymer to form a functional resin, and a photoacid generator is added to the functional resin. Then, it is dissolved in a solvent and used as a photosensitive resin composition.
- Non- Patent Document 1 As an example of a resin containing a monomer having an alcoholic hydroxyl group, for example, a resin containing 3,5-dihydroxy-1-adamantyl (meth) acrylate has also been proposed (see Patent Document 7).
- Patent Document 7 a chemically amplified positive resist composition containing a resin in which a (meth) acrylate derivative having a linking group introduced into a repeating unit is introduced and an acid generator has excellent resist performance such as resolution.
- Patent Document 8 there is a report that the line edge roughness is improved.
- JP 2006-243474 A Japanese Patent Laid-Open No. 4-39665 JP 10-319595 A JP 2000-26446 A JP 2003-167346 A JP 2004-323704 A JP 2000-122295 A JP 2005-331918 A JP 2007-210961 A
- the object of the present invention is to provide basic physical properties as a resist such as a pattern shape, dry etching resistance and heat resistance as a chemically amplified resist sensitive to KrF excimer laser, ArF excimer laser, F2 excimer laser X-ray, electron beam and EUV.
- An object of the present invention is to provide a well-balanced resist that improves sensitivity, resolution, and line edge roughness (LER) without sacrificing, and to provide a compound that can cope with further miniaturization of semiconductor substrate circuits.
- the inventors of the present invention have found that a mixture of alicyclic ester compounds represented by the general formulas (1) to (3) and photosensitivity containing the same in a repeating unit.
- the resin composition is implemented with a KrF excimer laser, ArF excimer laser, F2 excimer laser, X-ray, electron beam, or EUV (extreme ultraviolet light)
- the sensitivity is good, and the resolution, line edge roughness, etc.
- the present inventors have found that the compounds are useful compounds that improve the performance of various resists and are expected to solve the above problems for miniaturization of semiconductor substrate circuits.
- this invention includes the manufacturing method of the mixture of the above-mentioned alicyclic ester compound, According to this manufacturing method, the above-mentioned alicyclic ester compound can be efficiently manufactured with a high yield.
- the present invention relates to a mixture of alicyclic ester compounds represented by general formulas (1) to (3), a method for producing the mixture, and an alicyclic ester compound represented by general formulas (1) to (3).
- the present invention relates to a (meth) acrylic copolymer and a photosensitive resin composition thereof.
- R 1 represents a hydrogen atom or a methyl group
- R 2 and R 3 may be the same or different, and each independently represents a hydrogen atom, a hydroxyl group, a cyclic or straight chain having 1 to 10 carbon atoms, A chain, a branched alkyl group, an aryl group, a cycloalkyl group, an alkoxy group having 1 to 10 carbon atoms, an aryloxy group, an acyloxy group having 2 to 6 carbon atoms, or a halogen group.
- R 7 represents hydrogen or a methyl group
- R 8 to R 9 may be the same or different, each independently represents an alkyl group having 1 to 4 carbon atoms, and R 10 represents 5 carbon atoms
- R 11 represents hydrogen or a methyl group
- Z represents methylene (—CH 2 —) or oxa (—O—)
- X is the same or different, and represents a hydroxyl group, a halogen group, a nitrile group, or a carboxylic acid.
- R 12 represents hydrogen or a methyl group
- n3 represents an integer of 1 to 3
- L represents a methyl group, an ethyl group, a hydroxyl group, or a halogen group
- n4 represents 0 to 2
- a photosensitive resin composition comprising the (meth) acrylic copolymer according to (IV) or (V) and a photoacid generator.
- (VII) 40 to 80% of the alicyclic ester compound of the general formula (1), 10 to 30% of the alicyclic ester compound of the general formula (2), and the alicyclic ester compound of the general formula (3) The mixture according to (I) above, characterized by containing 10 to 30%.
- the alicyclic ester compound of the present invention is suitable as a raw material for various resin compositions such as various functional polymers utilizing heat resistance, surface hardness, chemical resistance and lipophilicity, and in particular, KrF excimer laser, ArF excimer.
- KrF excimer laser ArF excimer.
- F2 excimer laser X-ray, electron beam, EUV (extreme ultraviolet light), resolution and line edge roughness can be improved.
- the alicyclic ester compound of the present invention is represented by the following general formulas (1) to (3).
- R 1 represents a hydrogen atom or a methyl group
- R 2 and R 3 may be the same or different, and each independently represents a hydrogen atom, a hydroxyl group, a cyclic or cyclic group having 1 to 10 carbon atoms
- the alicyclic ester compounds represented by the general formulas (1) to (3) of the present invention include an adamantane compound represented by the general formula (4) and a (meth) acrylic acid represented by the general formula (5). It can be obtained by reacting a glycidyl compound with an amine or a salt catalyst thereof.
- the alicyclic ester compounds represented by the general formulas (1) to (3) of the present invention are in a tautomeric relationship with each other and are usually represented by the general formulas (1) to (3). Obtained in the form of a mixture of compounds.
- R 1 represents a hydrogen atom or a methyl group
- 2-hydroxy-1-adamantanecarboxylic acid 2-hydroxy-3- (meth) represented by the following chemical formula: Acryloyloxypropyl, 3-hydroxy-5,7-dimethyl-1-adamantanecarboxylic acid 2-hydroxy-3- (meth) acryloyloxypropyl, 3-hydroxy-5-ethyl-1-adamantanecarboxylic acid 2-hydroxy-3 -(Meth) acryloyloxypropyl, 3,5-dihydroxy-1-adamantanecarboxylic acid 2-hydroxy-3- (meth) acryloyloxypropyl and the like.
- 3-hydroxy-1-adamantanecarboxylic acid 1-hydroxy-3- (meth) represented by the following chemical formula: Acryloyloxypropan-2-yl, 3-hydroxy-5,7-dimethyl-1-adamantanecarboxylic acid 1-hydroxy-3- (meth) acryloyloxypropan-2-yl, 3-hydroxy-5-ethyl-1-
- Examples include 1-hydroxy-3- (meth) acryloyloxypropan-2-yl adamantanecarboxylate, 1-hydroxy-3- (meth) acryloyloxypropan-2-yl 3,5-dihydroxy-1-adamantanecarboxylate, and the like. It is done.
- alicyclic ester compound represented by the above general formula (3) of the present invention specifically, 3-hydroxy-1-adamantanecarboxylic acid 3-hydroxy-2- ( (Meth) acryloyloxypropyl, 3-hydroxy-5,7-dimethyl-1-adamantanecarboxylic acid 3-hydroxy-2- (meth) acryloyloxypropyl, 3-hydroxy-5-ethyl-1-adamantanecarboxylic acid 3-hydroxy Examples include -2- (meth) acryloyloxypropyl, 3,5-dihydroxy-1-adamantanecarboxylic acid 3-hydroxy-2- (meth) acryloyloxypropyl, and the like.
- the alicyclic ester compound of the general formula (1) is 40 to 80%
- the alicyclic ester compound of the general formula (2) is 10 to 30%
- the mixture of the alicyclic ester compound of the present invention comprises 50 to 75% of the alicyclic ester compound of the general formula (1), 15 to 25% of the alicyclic ester compound of the general formula (2), And 15 to 25% of the alicyclic ester compound of the general formula (3).
- adamantane compound represented by the general formula (4) that can be used in the present invention include 3-hydroxy-1-adamantanecarboxylic acid, 5-methyl-3-hydroxy-1-adamantanecarboxylic acid, 5, 7-dimethyl-3-hydroxy-1-adamantanecarboxylic acid, 3,5-dihydroxy-1-adamantanecarboxylic acid, 5-ethyl-3-hydroxy-1-adamantanecarboxylic acid, 3,5,7-trihydroxy-1 -Adamantanecarboxylic acid.
- glycidyl (meth) acrylate compound represented by the general formula (5) used in the present invention include glycidyl acrylate and glycidyl methacrylate.
- the amount to be added is preferably less than 1 equivalent with respect to the adamantane compound represented by the general formula (4). If it is 1 equivalent or more, transesterification occurs during the reaction or purification, and a di (meth) acrylic body having two (meth) acrylic groups is by-produced.
- a polymer is made from a monomer containing a large amount of di (meth) acrylic body, the performance of the resist deteriorates.
- the amount to be added is in the range of 0.50 to 0.99 equivalents, preferably 0.80 to 0.95 equivalents, relative to the adamantane compound. Below this, the adamantane compound represented by the general formula (4) remains unreacted in a large amount, which is not economically preferable.
- the onium salt, amine or salt catalyst used in the reaction of the adamantane compound represented by the general formula (4) and the glycidyl (meth) acrylate represented by the general formula (5) is a general four-component compound.
- Quaternary ammonium salts and low nucleophilic amines can be used. Specific examples include tetramethylammonium chloride, tetramethylammonium bromide, tetramethylammonium iodide, tetraethylammonium chloride, tetraethylammonium bromide, tetraethylammonium iodide, tetrapropyl.
- Ammonium chloride tetrapropylammonium bromide, tetrabutylammonium chloride, tetrabutylammonium bromide, benzyltrimethylammonium chloride, benzyltrimethylammonium bromide , Benzyltributylammonium chloride, benzyltributylammonium bromide, phenyltrimethylammonium chloride, 2-chloro-1-methylpyridinium iodide, 1-butylpyridinium chloride, methylviologen chloride, 1,8-diazabicyclo [5.4.0] undeca -7-ene, 1,5-diazabicyclo [4.3.0] non-5-ene, 2,6-lutidine.
- an amine or a salt thereof that is soluble in the solvent to be used is selected. These amines or salts thereof can be used alone or in combination of two or more.
- the amount of amine or salt thereof to be added is 0.001 to 10 equivalents, preferably 0.01 to 1 equivalent, more preferably 0.05 to 0.5 equivalent, relative to the adamantane compound. If it is 0.001 equivalent or more, the reaction is completed at a sufficient speed, and if it is 10 equivalent or more, separation and purification of the amine or its salt becomes difficult.
- dimethyl sulfoxide dimethyl sulfoxide, diethyl ether , Diisopropyl ether, tetrahydrofuran, dioxane, dimethylformamide, chloroform, chlorobenbezene, acetone, methyl ethyl ketone, and methyl isobutyl ketone.
- dimethyl sulfoxide is desirable because it sufficiently dissolves the adamantane compound represented by the general formula (4), has a high boiling point, and can raise the reaction temperature.
- solvents can be used alone or in a system in which two or more solvents are mixed.
- the amount of the solvent is 1 to 100 parts by weight, preferably 3 to 10 parts by weight, based on 1 part by weight of the adamantane compound represented by the general formula (4). It is desirable that the adamantane compound is completely dissolved. If not completely dissolved, side reactions are likely to occur. Further, since this reaction is low in reactivity, it is desirable to react at as high a concentration as possible.
- the adamantanecarboxylic acid compound represented by the general formula (4) and the (meth) acrylic acid represented by the general formula (5) When a glycidyl compound, an amine or a salt thereof is dissolved and mixed, it can be produced without a solvent.
- reaction temperature is 20 ° C to 150 ° C, preferably 50 ° C to 120 ° C
- reaction time is 1 hour.
- 10 to 10 hours preferably 2 to 8 hours, under normal pressure, reduced pressure or increased pressure.
- the reaction can be performed by appropriately selecting a known method such as a batch system, a semi-batch system, or a continuous system.
- a polymerization inhibitor may be added to the above reaction.
- the polymerization inhibitor is not particularly limited, and 2,2,6,6-tetramethyl-4-hydroxypiperidine-1-oxyl, N-nitrosophenylhydroxylamine ammonium salt, N-nitrosophenylhydroxylamine aluminum salt, N— Nitroso-N- (1-naphthyl) hydroxylamine ammonium salt, N-nitrosodiphenylamine, N-nitroso-N-methylaniline, nitrosonaphthol, p-nitrosophenol, N, N'-dimethyl-p-nitrosoaniline, etc.
- the alicyclic ester compounds represented by the general formulas (1) to (3) obtained based on the above description may be used by isolating each isomer, but after the isolation, the mixture is obtained by isomerization reaction. Therefore, it may be used for polymerization of a resist polymer in the state of a mixture without isolation.
- separation and purification using known purification methods such as filtration, concentration, distillation, extraction, crystallization, recrystallization, column chromatography, activated carbon, etc. It is desirable to isolate and purify the desired high-purity monomer by a method or a combination thereof.
- an excessive (meth) acrylic acid derivative, an additive such as an acid or a base is removed by washing the reaction solution with water.
- the washing water may contain an appropriate inorganic salt such as sodium chloride or sodium bicarbonate.
- unreacted (meth) acrylic acid derivatives are removed by alkali washing.
- an aqueous sodium hydroxide solution, an aqueous potassium hydroxide solution, an aqueous sodium carbonate solution, an aqueous sodium hydrogen carbonate solution, aqueous ammonia, or the like can be used, but the alkaline component used is not particularly limited.
- acid cleaning may be performed to remove metal impurities.
- inorganic acids such as hydrochloric acid aqueous solution, sulfuric acid aqueous solution and phosphoric acid aqueous solution and organic acids such as oxalic acid aqueous solution are used.
- an organic solvent or the like may be added to the reaction solution, and the organic solvent to be added may be the same as that used in the reaction or may be different. In general, it is preferable to use a solvent with low polarity and good separability from water.
- the (meth) acrylic copolymer obtained by copolymerizing the alicyclic ester compounds represented by the general formulas (1) to (3) of the present invention can be used as a functional resin used in a photoresist.
- the alicyclic ester compounds represented by the general formulas (1) to (3) are copolymerized to obtain a (meth) acrylic copolymer, each may be used alone or as a mixture. Also good.
- the (meth) acrylic copolymer of the present invention has at least one selected from the general formulas (6) to (8), at least one selected from the general formulas (9) to (10), and the general formula (11). It is preferable that at least one selected from (12) includes a repeating unit.
- the repeating units of the general formulas (6) to (8) can be obtained by polymerizing the alicyclic ester compounds represented by the general formulas (1) to (3) as raw materials (monomers), respectively. .
- R 4 represents hydrogen or a methyl group
- R 5 represents an alkyl group having 1 to 4 carbon atoms
- R 6 represents a linear or branched alkylene group or alicyclic alkylene group having 5 to 20 carbon atoms. Group.
- R 7 represents hydrogen or a methyl group
- R 8 to R 9 may be the same or different, each represents an alkyl group having 1 to 4 carbon atoms
- R 10 represents a cycloalkyl having 5 to 20 carbon atoms. Group or alicyclic alkyl group.
- R 11 represents hydrogen or a methyl group
- Z represents methylene (—CH 2 —) or oxa (—O—)
- X is the same or different, and represents a hydroxyl group, a halogen group, a nitrile group, or a carboxylic acid.
- R 12 represents hydrogen or a methyl group
- n3 represents 1 to 3
- L represents a methyl group, an ethyl group, a hydroxyl group, or a halogen group
- n4 represents 0 to 2
- Examples of the raw material of the repeating unit represented by the general formula (9) include 2-methyl-2- (meth) acryloyloxyadamantane, 2-ethyl-2- (meth) acryloyloxyadamantane, 2-isopropyl-2- (Meth) acryloyloxyadamantane, 2-n-propyl-2- (meth) acryloyloxyadamantane, 2-n-butyl-2- (meth) acryloyloxyadamantane, 1-methyl-1- (meth) acrylic Royloxycyclopentane, 1-ethyl-1- (meth) acryloyloxycyclopentane, 1-methyl-1- (meth) acryloyloxycyclohexane, 1-ethyl-1- (meth) acryloyloxycyclohexane, 1- Methyl-1- (meth) acryloyloxycycloheptane, 1-eth -1- (meth)
- Examples of the raw material of the repeating unit represented by the general formula (10) include 2-cyclohexyl-2- (meth) acryloyloxypropane, 2- (4-methylcyclohexyl) -2- (meth) acryloyloxypropane, 2 -Adamantyl-2- (meth) acryloyloxypropane, 2- (3- (1-hydroxy-1-methylethyl) adamantyl) -2- (meth) acryloyloxypropane and the like.
- the raw material of the repeating unit represented by the general formula (12) includes ⁇ - (meth) acryloyloxy- ⁇ -butyrolactone, ⁇ - (meth) acryloyloxy- ⁇ -butyrolactone, (meth) acryloyloxypantolactone Etc.
- the repeating units represented by the general formulas (9) and (10) have a function of dissociating with an acid. These have approximately the same performance, and by containing at least one kind, it reacts with the acid generated from the photoacid generator during exposure to generate a carboxylic acid group, which can be converted to alkali availability.
- repeating units represented by the general formulas (11) and (12) have a lactone group, which has approximately the same function, and includes at least one kind of function. Solvent solubility, substrate adhesion, and affinity to an alkaline developer can be improved, and it can be used for photolithography.
- Copolymerization ratio of (meth) acrylic copolymer comprising repeating units represented by general formulas (6) to (8), general formulas (9) to (10), and general formulas (11) to (12)
- the repeating units of the general formulas (6) to (8) contain 1% by weight to 60% by weight, preferably 3% by weight to 50% by weight, more preferably 5% by weight to 40% by weight.
- the compounds of the formulas (9) to (10) contain at least one kind in a repeating unit of 10% to 80% by weight, preferably 15% to 60% by weight, more preferably 20% to 50% by weight, It is preferable that at least one compound of the general formulas (11) to (12) is contained in an amount of 10% to 80% by weight, preferably 15% to 60% by weight, and more preferably 15% to 50% by weight.
- the total of the copolymerization ratios of the general formulas (6) to (8), the general formulas (9) to (10), and the general formulas (11) to (12) is 100% by weight.
- the (meth) acrylic copolymer of the present invention may further contain other repeating units at a copolymerization ratio of 20% by weight or less in addition to the repeating units of the general formulas (6) to (12). Is more preferably 10% by weight or less.
- a monomer serving as a repeating unit is dissolved in a solvent, a catalyst is added, and the reaction is carried out while heating or cooling.
- the conditions for the polymerization reaction can be arbitrarily set according to the type of initiator, the starting method such as heat and light, temperature, pressure, concentration, solvent, additive, etc., and the (meth) acrylic copolymer of the present invention
- the polymerization can be carried out by a known method such as radical polymerization using a radical generator such as azoisobutyronitrile or peroxide, or ionic polymerization using a catalyst such as alkyl lithium or Grignard reagent.
- Solvents used in the polymerization reaction of the (meth) acrylic copolymer of the present invention include ketones such as 2-butanone, 2-heptanone, methyl isobutyl ketone, cyclohexanone, hexane, heptane, octane, cyclohexane, cyclooctane, decalin.
- Alcohols such as norbornane, methanol, ethanol, propanol, 2-propanol, n-butanol, sec-butanol, t-butanol, pentanol, hexanol, propylene glycol monomethyl ether, diethyl ether, tetrahydrofuran, 1,
- Examples include ethers such as 4-dioxane, and carboxylic acid esters such as ethyl acetate, butyl acetate, methyl lactate, and propylene glycol monomethyl ether acetate. These solvents may be used alone or in combination of two or more. Mixed and can be used.
- the (meth) acrylic copolymer of the present invention for example, a (meth) acrylic copolymer containing any of the repeating units represented by the general formulas (6) to (12) is random copolymer, block copolymer, or Graft copolymerization may be used, but random copolymerization is preferred.
- the (meth) acrylic copolymer obtained in the present invention can be purified by a known method. Specifically, for removal of metal impurities, ultrafiltration, microfiltration, acid washing, water washing with an electric conductivity of 10 mS / m or less, and extraction can be performed in combination.
- the acid to be added include organic acids such as formic acid, acetic acid and propionic acid which are water-soluble acids, and inorganic acids such as hydrochloric acid, sulfuric acid, nitric acid and phosphoric acid. In view of the above, it is preferable to use an inorganic acid.
- the oligomers can be removed by a combination of ultrafiltration, microfiltration, crystallization, recrystallization, extraction, and water washing with an electrical conductivity of 10 mS / m or less.
- the polystyrene-reduced weight average molecular weight (hereinafter referred to as “Mw”) of the (meth) acrylic copolymer of the present invention measured by gel permeation chromatography (GPC) is preferably 1,000 to 500,000, more preferably Is from 3,000 to 100,000.
- the ratio (Mw / Mn) of Mw of the (meth) acrylic copolymer to the polystyrene-equivalent number average molecular weight (hereinafter referred to as “Mn”) measured by GPC is usually 1 to 10, preferably 1 to 5.
- a (meth) acryl copolymer can be used individually or in mixture of 2 or more types.
- the photosensitive resin composition of the present invention may be used by dissolving the (meth) acrylic polymer and the photoacid generator in a solvent.
- solvents include linear ketones such as 2-pentanone and 2-hexanone, cyclic ketones such as cyclopentanone and cyclohexanone, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate and the like.
- Propylene glycol monoalkyl acetates ethylene glycol monomethyl ether acetate, ethylene glycol monoalkyl ether acetates such as ethylene glycol monoethyl ether acetate, propylene glycol monoalkyl ethers such as propylene glycol monomethyl ether and propylene glycol monoethyl ether, ethylene glycol Ethylene glycol monoal such as monomethyl ether and ethylene glycol monoethyl ether Ethers, diethylene glycol dimethyl ether, diethylene glycol alkyl ethers such as diethylene glycol diethyl ether, ethyl acetate, esters such as ethyl lactate, cyclohexanol, alcohols such as 1-octanol, ethylene carbonate, and ⁇ - butyrolactone. These solvents can be used alone or in admixture of two or more.
- Photoacid generators can be used as acid generators for chemically amplified resist compositions depending on the wavelength of the exposure light, while considering the thickness range of the resist coating film and its own light absorption coefficient. Can be appropriately selected.
- a photo-acid generator can be used individually or in combination of 2 or more types.
- the amount of the acid generator used is preferably 0.1 to 20 parts by weight, more preferably 0.5 to 15 parts by weight per 100 parts by weight of the (meth) acrylic copolymer.
- Examples of usable photoacid generators in the far ultraviolet region include onium salt compounds, sulfonimide compounds, sulfone compounds, sulfonic acid ester compounds, quinonediazide compounds, and diazomethane compounds.
- onium salt compounds such as sulfonium salts, iodonium salts, phosphonium salts, diazonium salts, and pyridinium salts are suitable for KrF excimer laser, EUV, and electron beams.
- triphenylsulfonium triflate triphenylsulfonium nonafluorobutyrate, triphenylsulfonium hexafluoroantimonate, triphenylsulfonium naphthalenesulfonate, (hydroxyphenyl) benzylmethylsulfonium toluenesulfonate, diphenyliodonium triflate, diphenyl Examples include iodonium pyrene sulfonate, diphenyl iodonium dodecyl benzene sulfonate, and diphenyl iodonium hexafluoroantimonate.
- the photosensitive resin composition of the present invention includes an acid diffusion controller having an action of controlling a diffusion phenomenon of an acid generated from an acid generator upon exposure in a resist film and suppressing an undesirable chemical reaction in a non-exposed region. Can be blended.
- an acid diffusion controller a nitrogen-containing organic compound whose basicity is not changed by exposure or heat treatment in the resist pattern forming step is preferable.
- nitrogen-containing organic compounds examples include monoalkylamines such as n-hexylamine, n-heptylamine, and n-octylamine; dialkylamines such as di-n-butylamine; trialkyls such as triethylamine Amines: Triethanolamine, tripropanolamine, tributanolamine, tripentanolamine, trihexanolamine, etc. substituted trialcoholamines, trimethoxyethylamine, trimethoxypropylamine, trimethoxybutylamine, triethoxybutylamine, etc.
- Trialkoxyalkylamines aromatic amines such as aniline, N, N-dimethylaniline, 2-methylaniline, 3-methylaniline, 4-methylaniline, 4-nitroaniline, diphenylamine, etc .; ethylene Amines such as amines, amide compounds such as formamide, N, N-dimethylformamide, N, N-dimethylacetamide, N-methylpyrrolidone, urea compounds such as urea, imidazoles such as imidazole and benzimidazole, pyridine, 4- In addition to pyridines such as methylpyridine, 1,4-diazabicyclo [2.2.2] octane and the like can be mentioned.
- the compounding amount of the acid diffusion controller is usually 15 parts by weight or less, preferably 0.001 to 10 parts by weight, more preferably 0.005 to 5 parts by weight per 100 parts by weight of the (meth) acrylic copolymer. .
- additive components that are also used in conventional chemically amplified resist compositions, such as surfactants, quenchers, sensitizers, and halation, as necessary.
- Various additives such as an inhibitor, a storage stabilizer, and an antifoaming agent can be contained.
- the composition solution prepared as described above is applied to an appropriate application means such as a spin coater, a dip coater, or a roller coater, for example, a silicon wafer, a metal
- an appropriate application means such as a spin coater, a dip coater, or a roller coater, for example, a silicon wafer, a metal
- a resist film is formed by coating on a substrate such as plastic, glass, ceramic, etc., and in some cases, after heat treatment at a temperature of about 50 ° C. to 200 ° C. in advance, exposure is performed through a predetermined mask pattern.
- the thickness of the coating film is, for example, about 0.01 to 5 ⁇ m, preferably 0.02 to 1 ⁇ m, and more preferably about 0.02 to 0.1 ⁇ m.
- light of various wavelengths such as ultraviolet rays and X-rays
- light source an F 2 excimer laser (wavelength 157 nm), an ArF excimer laser (wavelength 193 nm), or a KrF excimer laser (wavelength 248 nm).
- EUV wavelength 13 nm
- X-ray electron beam and the like
- exposure conditions are suitably selected according to the compounding composition of the photosensitive resin composition, the kind of each additive, etc.
- a predetermined resist pattern is formed by development with an alkali developer, usually at 10 to 50 ° C. for 10 to 200 seconds, preferably at 20 to 25 ° C. for 15 to 1200 seconds.
- alkali developer examples include alkali metal hydroxides, aqueous ammonia, alkylamines, alkanolamines, heterocyclic amines, tetraalkylammonium hydroxides, choline, 1,8-diazabicyclo- [5. 4.0] -7-undecene, 1,5-diazabicyclo- [4.3.0] -5-nonene and the like, usually 0.0001 to 10% by weight, preferably 0.01 to 5% by weight %, More preferably, an alkaline aqueous solution dissolved to a concentration of 0.1 to 3% by weight is used. In addition, a water-soluble organic solvent and a surfactant can be appropriately added to the developer composed of the alkaline aqueous solution.
- the photosensitive resin composition of the present invention has excellent adhesion to a substrate, has alkali solubility, and can form a fine pattern with high accuracy.
- Example 1 Provide of methacryloyloxyhydroxypropyl 3-hydroxy-1-adamantanecarboxylate> To a 1000 ml three-necked round bottom flask equipped with a stirrer, thermometer, and air blowing port, 49.08 g (0.25 mol) of 3-hydroxy-1-adamantanecarboxylic acid, 31.98 g (0.225 mol) of glycidyl methacrylate, Tetramethylammonium chloride (2.74 g, 25 mmol), p-methoxyphenol (319.6 mg, 2.6 mmol) and dimethyl sulfoxide (250 g) were charged, and the mixture was stirred at 90 ° C. for 5 hours while blowing air.
- the ratio of dimethacrylic product / 1-hydroxy-3-adamantanecarboxylic acid methacryloyloxyhydroxypropyl was 0.002. Further, when the ratio of the compound of formula (1), the compound of formula (2), and the compound of formula (3) was confirmed from the NMR spectrum and HPLC area values, it was 64:18:18.
- Example 2 ⁇ Production of methacryloyloxyhydroxypropyl polymer of 3-hydroxy-1-adamantanecarboxylic acid> 3-hydroxy-1-adamantanecarboxylic acid 2-hydroxy-3-methacryloyloxypropyl (compound of formula (1)) obtained in Example 1 and 3-hydroxy-1-adamantanecarboxylic acid 1-hydroxy-3-methacryloyl Mixture of oxypropan-2-yl (compound of formula (2)), 3-hydroxy-1-adamantanecarboxylic acid 3-hydroxy-2-methacryloyloxypropyl (compound of formula (3)) (hereinafter, monomer M) 3 0.05 g, 2.47 g of 2-ethyl-2-methacryloyloxyadamantane (hereinafter referred to as monomer E) as a raw material of formula (9), and ⁇ -methacryloyloxy- ⁇ -butyrolactone (hereinafter referred to as monomer G) as a raw material of formula (12)
- Example 3 100 parts by weight of methacrylic copolymer A and 10 parts by weight of triphenylsulfonium nonafluorobutanesulfonate (TPS-109 manufactured by Midori Chemical Co., Ltd.) were dissolved in an ethyl lactate solvent so that the copolymer concentration was 6.3% by weight.
- Resin composition C was prepared. After applying an antireflection film (ARC-29 manufactured by Nissan Chemical Co., Ltd.) on a silicon wafer, this photoresist resin composition was applied in the form of an antireflection film by spin coating to form a photosensitive layer having a thickness of 100 nm. After pre-baking on a hot plate at a temperature of 90 ° C.
- the photosensitive layer was irradiated with an 80 nm half-pitch line-and-space pattern (10 lines) using an electron beam drawing apparatus (ELS-7700 manufactured by Elionix).
- ELS-7700 electron beam drawing apparatus
- Post-baking (PEB) was performed at a predetermined temperature for 90 seconds.
- the film was developed with a 0.3 M aqueous solution of tetramethylammonium hydroxide for 60 seconds and rinsed with pure water to obtain a line and space pattern.
- monomer H 3-hydroxy-1-adamantyl methacrylate
- Comparative Example 2 100 parts by weight of methacrylic copolymer B and 10 parts by weight of triphenylsulfonium nonafluorobutanesulfonate (manufactured by Midori Chemical Co., Ltd., TPS-109) are dissolved in propylene glycol monomethyl ether acetate so that the copolymer concentration is 6.3% by weight.
- Example 3 was carried out in the same manner as in Example 3 except that a photosensitive resin composition D having a copolymer concentration of 6.3% by weight was prepared.
- Example 4 ⁇ Production of methacryloyloxyhydroxypropyl 3-hydroxy-1-adamantanecarboxylate polymer 2> 3-hydroxy-1-adamantanecarboxylic acid 2-hydroxy-3-methacryloyloxypropyl and 3-hydroxy-1-adamantanecarboxylic acid 1-hydroxy-3-methacryloyloxypropan-2-yl obtained in Example 1; 3-Hydroxy-1-adamantanecarboxylic acid 3-hydroxy-2-methacryloyloxypropyl mixture (monomer M) 3.05 g, 2-adamantyl-2-methacryloyloxypropane (hereinafter referred to as monomer) as a raw material represented by formula (10) I) 4.72 g, 2-methacryloyloxy-5-oxo-4-oxatricyclo [4.2.1.0 3,7 ] nonane (hereinafter, monomer N) 4 as a raw material represented by the formula (11) 0.000 g, azobisisobut
- reaction solution was dropped into 500 mL of n-hexane to solidify and purify the resin, and the resulting white powder was filtered through a membrane filter and washed with 1000 mL of n-hexane. The white powder was collected and dried overnight at 40 ° C. under reduced pressure to obtain 7.65 g of methacrylic copolymer E.
- Example 5 100 parts by weight of methacrylic copolymer E and 10 parts by weight of triphenylsulfonium nonafluorobutanesulfonate (TPS-109 manufactured by Midori Chemical Co., Ltd.) were dissolved in an ethyl lactate solvent so that the copolymer concentration was 6.3% by weight.
- Resin composition F was prepared.
- Comparative Example 4 100 parts by weight of methacrylic copolymer G and 10 parts by weight of triphenylsulfonium nonafluorobutane sulfonate (TPS-109 manufactured by Midori Chemical Co., Ltd.) were dissolved in an ethyl lactate solvent so that the copolymer concentration was 6.3% by weight. Resin composition H was prepared.
- Examples 6 and 7 and Comparative Examples 5 and 6 ⁇ Resist pattern formation> After applying an antireflection film (ARC-29 manufactured by Nissan Chemical Co., Ltd.) on a silicon wafer, photosensitive resin compositions C, D, F, and H were applied by spin coating to form a photosensitive layer having a thickness of 100 nm.
- the photosensitive layer formed from the photosensitive resin composition C (prepared in Example 3) is Example 6, and the photosensitive layer formed from the photosensitive resin composition D (prepared in Comparative Example 2) is Comparative Example 5.
- the photosensitive layer formed from the resin composition F (prepared in Example 5) was set as Example 7, and the photosensitive layer formed from the photosensitive resin composition H (prepared in Comparative Example 4) was set as Comparative Example 6.
- Table 2 The results are shown in Table 2.
- Example 6 and Comparative Example 5 and Example 7 and Comparative Example 6 confirms that the photosensitive resin composition containing the polymer of the present invention has better LWR and lower limit resolution. It was done.
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Abstract
Description
(I)下記一般式(1)で表わされる脂環式エステル化合物と、下記一般式(2)で表わされる脂環式エステル化合物と、下記一般式(3)で表わされる脂環式エステル化合物とを含む混合物である。
(VII)一般式(1)の脂環式エステル化合物を40~80%、一般式(2)の脂環式エステル化合物を10~30%、および一般式(3)の脂環式エステル化合物を10~30%含むことを特徴とする上記(I)に記載の混合物である。
ここで、一般式(6)~(8)、および一般式(9)~(10)、および一般式(11)~(12)の共重合比の合計は100重量%とする。そして、本発明の(メタ)アクリル共重合体には、一般式(6)~(12)の繰り返し単位の他に、共重合比で20重量%以下で他の繰り返し単位をさらに含んでも構わないが、10重量%以下がより好ましい。
<HPLC測定条件>
カラム:化学物質評価機構L-column ODS L-C18(5μm、4.6φ×250mm)、展開溶媒 :アセトニトリル/水 =40/60(v/v)、流量:1ml/分、カラム温度:40℃、検出器:RI
<GC条件>
カラム:TC-17(0.53mmI.D.×30m)、インジェクション温度:280℃、オーブン温度:70℃(1分保持)→10℃/分で昇温→280℃(10分保持)、検出器:FID、移動相:アルゴン
<3-ヒドロキシ-1-アダマンタンカルボン酸メタクリロイルオキシヒドロキシプロピルの製造>
撹拌機、温度計、空気吹込み口を備えた1000ml三口丸底フラスコに、3-ヒドロキシ-1-アダマンタンカルボン酸49.08g(0.25mol)、メタクリル酸グリシジル31.98g(0.225mol)、テトラメチルアンモニウムクロリド2.74g(25mmol)、p-メトキシフェノール319.6mg(2.6mmol)、ジメチルスルホキシド250gを仕込み、空気を吹き込みながら、90℃で5時間撹拌した。反応終了後、クロロホルム1000gを加え、有機層を5%塩化ナトリウム水溶液1000g、5%炭酸ナトリウム水溶液1000g、1%硫酸水溶液1000g、5%塩化ナトリウム水溶液1000gで洗浄した。有機層を回収し、シリカゲル25g加え、1時間撹拌し、5Cろ紙でシリカゲルを除去し、クロロホルム1000gで洗浄した。回収したクロロホルム溶液に活性炭(クラレコールGLC10/32)60gを加え、5Cろ紙で活性炭を除去した。溶媒を真空濃縮し、淡黄色粘調液体54.75g(収率64.8%)を得た。Hおよび13C-NMR、HPLCにより構造を確認したところ、3-ヒドロキシ-1-アダマンタンカルボン酸2-ヒドロキシ-3-メタクリロイルオキシプロピル(式(1)の化合物)と3-ヒドロキシ-1-アダマンタンカルボン酸1-ヒドロキシ-3-メタクリロイルオキシプロパン-2-イル(式(2)の化合物)、3-ヒドロキシ-1-アダマンタンカルボン酸3-ヒドロキシ-2-メタクリロイルオキシプロピル(式(3)の化合物)の混合物であることを確認した。GCでジメタクリル体の生成量を確認したところ、ジメタクリル体/1-ヒドロキシ-3-アダマンタンカルボン酸メタクリロイルオキシヒドロキシプロピルの比は0.002であった。また、NMRスペクトル、HPLCの面積値から式(1)の化合物、式(2)の化合物、式(3)の化合物の比を確認したところ、64:18:18であった。
1H-NMRスペクトル(CDCl3):δ1.5~2.1ppm(16H、アダマンタン)、1.9ppm(3H、メタクリロイル基のメチル基)、3.7ppm(0.75H、式(2)および式(3)の構造のグリシジル基-CH 2-OH)、4.0-4.7ppm(3.88H、グリシジル基)、5.1ppm(0.37H、式(2)および式(3)の構造のグリシジル基2位)、5.6ppm(1H、メタクリロイル基二重結合)、6.1ppm(1H、メタクリロイル基二重結合)。
13C-NMRスペクトル(CDCl3):18ppm(メタクリロイル基のメチル基)、24.5~46.0ppm(アダマンタン)、60.8ppm、61.0ppm、62.3ppm、62.8ppm、65.0ppm、67.7ppm、68.0ppm、72.0ppm、72.6ppm(グリシジル基)、65.4ppm(OH結合アダマンタン)126.3ppm(メタクリロイル基二重結合末端)135.8ppm(メタクリロイル基カルボニルα位)、166.8ppm、167.0ppm、167.3ppm(メタクリロイル基カルボニル)、176.0ppm、176.2ppm、176.4ppm(アダマンタンカルボン酸カルボニル)。
メタクリル酸グリシジルの仕込量を49.75g(0.35mol)に変えた以外は、実施例1と同様に行った。GCでジメタクリル体の生成量を確認したところ、ジメタクリル体/1-ヒドロキシ-3-アダマンタンカルボン酸メタクリロイルオキシヒドロキシプロピルの比は0.072であった。また、NMRスペクトル、HPLCの面積値から式(1)の化合物、式(2)の化合物、式(3)の化合物の比を確認したところ、64:18:18であった。
<3-ヒドロキシ-1-アダマンタンカルボン酸メタクリロイルオキシヒドロキシプロピル重合物の製造>
実施例1で得られた3-ヒドロキシ-1-アダマンタンカルボン酸2-ヒドロキシ-3-メタクリロイルオキシプロピル(式(1)の化合物)と3-ヒドロキシ-1-アダマンタンカルボン酸1-ヒドロキシ-3-メタクリロイルオキシプロパン-2-イル(式(2)の化合物)、3-ヒドロキシ-1-アダマンタンカルボン酸3-ヒドロキシ-2-メタクリロイルオキシプロピル(式(3)の化合物)の混合物(以下、モノマーM)3.05g、式(9)の原料として2-エチル-2-メタクリロイルオキシアダマンタン(以下、モノマーE)4.47g、式(12)の原料としてα-メタクリルロイルオキシ-γ-ブチロラクトン(以下、モノマーG)3.07g、アゾビスイソブチロニトリル0.37gを、テトラヒドロフラン90mLに溶解させ、窒素雰囲気下、反応温度を60℃に保持して、15時間重合させた(モノマー仕込み比は、M/E/G=20/40/40モル%)。重合後、反応溶液を450mLのn-ヘキサン中に滴下して、生成樹脂を凝固精製させ、生成した白色粉末をろ過して、減圧下40℃で一晩乾燥させメタクリル共重合体Aを7.48g得た。
メタクリル共重合体A100重量部とトリフェニルスルホニウムノナフルオロブタンスルホネート(みどり化学社製TPS-109)10重量部を、共重合体濃度6.3重量%になるように乳酸エチル溶剤で溶解させ、感光性樹脂組成物Cを調製した。シリコンウエハー上に反射防止膜(日産化学社製ARC-29)を塗布した後、このフォトレジスト用樹脂組成物をスピンコーティングにより反射防止膜状に塗布し、厚み100nmの感光層を形成した。ホットプレート上で温度90℃、60秒間プリベークした後、電子線描画装置(エリオニクス社製ELS-7700)にて感光層を80nmハーフピッチのライン・アンド・スペースパターン(ライン10本)で照射した。所定温度で90秒間ポストベーク(PEB)した。次いで、0.3Mのテトラメチルアンモニウムヒドロキシド水溶液により60秒間現像し、純水でリンスし、ライン・アンド・スペースパターンを得た。
モノマーMの代わりに、3-ヒドロキシ-1-アダマンチルメタクリレート(以下、モノマーH)を2.12g用いた他は実施例2と同じ操作を行い(モノマー仕込み比は、H/E/G=20/40/40モル%)、メタクリル共重合体Bを6.85g得た。
メタクリル共重合体B100重量部とトリフェニルスルホニウムノナフルオロブタンスルホネート(みどり化学社製TPS-109)10重量部を、共重合体濃度6.3重量%になるようにプロピレングリコールモノメチルエーテルアセタートで溶解させ、共重合体濃度6.3重量%の感光性樹脂組成物Dを調製した以外は、実施例3と同様に行った。
<3-ヒドロキシ-1-アダマンタンカルボン酸メタクリロイルオキシヒドロキシプロピル重合物の製造2>
実施例1で得られた3-ヒドロキシ-1-アダマンタンカルボン酸2-ヒドロキシ-3-メタクリロイルオキシプロピルと3-ヒドロキシ-1-アダマンタンカルボン酸1-ヒドロキシ-3-メタクリロイルオキシプロパン-2-イル、3-ヒドロキシ-1-アダマンタンカルボン酸3-ヒドロキシ-2-メタクリロイルオキシプロピルの混合物(モノマーM)3.05g、式(10)で表わされる原料として2-アダマンチル-2-メタクリルロイルオキシプロパン(以下、モノマーI)4.72g、式(11)で表わされる原料として2-メタクリルロイルオキシ-5-オキソ-4-オキサトリシクロ[4.2.1.03,7]ノナン(以下、モノマーN)4.00g、アゾビスイソブチロニトリル0.37gを、テトラヒドロフラン100mLに溶解させ、窒素雰囲気下、反応温度を60℃に保持して、15時間重合させた(モノマー仕込み比は、M/I/N=20/40/40モル%)。重合後、反応溶液を500mLのn-ヘキサン中に滴下して、樹脂を凝固精製させ、生成した白色粉末をメンブレンフィルターでろ過し、n-ヘキサンの1000mlで洗浄した。白色粉末を回収し、減圧下40℃で一晩乾燥させメタクリル共重合体Eを7.65g得た。
メタクリル共重合体E100重量部とトリフェニルスルホニウムノナフルオロブタンスルホネート(みどり化学社製TPS-109)10重量部を、共重合体濃度6.3重量%になるように乳酸エチル溶剤で溶解させ、感光性樹脂組成物Fを調製した。
モノマーMの代わりに、3-ヒドロキシ-1-アダマンチルメタクリレート(モノマーH)を2.12g用いた他は実施例4と同じ操作を行い(モノマー仕込み比は、M/I/N=20/40/40モル%)、メタクリル共重合体Gを7.43得た。
メタクリル共重合体G100重量部とトリフェニルスルホニウムノナフルオロブタンスルホネート(みどり化学社製TPS-109)10重量部を、共重合体濃度6.3重量%になるように乳酸エチル溶剤で溶解させ、感光性樹脂組成物Hを調製した。
<レジストパターン形成>
シリコンウエハー上に反射防止膜(日産化学社製ARC-29)を塗布した後、感光性樹脂組成物C、D、F、Hをスピンコーティングにより塗布し、厚み100nmの感光層をそれぞれ形成した。感光性樹脂組成物C(実施例3にて調製)から形成した感光層を実施例6、感光性樹脂組成物D(比較例2にて調製)から形成した感光層を比較例5、感光性樹脂組成物F(実施例5にて調製)から形成した感光層を実施例7、および感光性樹脂組成物H(比較例4にて調製)から形成した感光層を比較例6として、これらの結果を表2に示す。ホットプレート上で温度90℃、60秒間プリベークした後、電子線描画装置(エリオニクス社製ELS-7700)にて描画を行った。表2に示した温度で90秒間ポストベーク(PEB)を行い、次いで0.3Mのテトラメチルアンモニウムヒドロキシド水溶液により60秒間現像し、純水でリンスし、ライン・アンド・スペースパターンを得た。作成したライン・アンド・スペースパターンをFE-SEMで観察し、100nmの1:1のライン・アンド・スペースパターンで解像する露光量を最適露光量Eop(μC/cm2)とし、最適露光量において分離解像している1:1のライン・アンド・スペースパターンの最小寸法を限界解像度とした。さらに50箇所のスペース幅を測定し、その結果から標準偏差(σ)の三倍値(3σ)を求め、LWRとした。その結果を表2に示す。実施例6と比較例5、および、実施例7と比較例6の結果の比較により、本発明のポリマーを含む感光性樹脂組成物の方が、LWRが良好で、限界解像度も小さいことが確認された。
Claims (7)
- 一般式(4)で表されるアダマンタン化合物に対して、一般式(5)で表される(メタ)アクリル酸グリシジル化合物を0.50~0.99当量の範囲で反応させることを特徴とする請求項2に記載の混合物の製造方法。
- 一般式(6)~(8)から選ばれる少なくとも一種類、一般式(9)~(10)から選ばれる少なくとも一種類、および一般式(11)~(12)から選ばれる少なくとも一種類を繰り返し単位に含むことを特徴とする請求項4に記載の(メタ)アクリル共重合体。
- 請求項4または5に記載の(メタ)アクリル共重合体と光酸発生剤を含む感光性樹脂組成物。
- 一般式(1)の脂環式エステル化合物を40~80%、一般式(2)の脂環式エステル化合物を10~30%、および一般式(3)の脂環式エステル化合物を10~30%含むことを特徴とする請求項1に記載の混合物。
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CN201480022671.6A CN105143291B (zh) | 2013-04-23 | 2014-04-22 | 新型脂环式酯化合物、(甲基)丙烯酸类共聚物以及包含它的感光性树脂组合物 |
JP2015513772A JP6274205B2 (ja) | 2013-04-23 | 2014-04-22 | 新規脂環式エステル化合物、(メタ)アクリル共重合体およびそれを含む感光性樹脂組成物 |
EP14788121.3A EP2990425B1 (en) | 2013-04-23 | 2014-04-22 | Novel alicyclic ester compound, and (meth)acrylic copolymer and photosensitive resin composition containing same |
KR1020157022304A KR20160003628A (ko) | 2013-04-23 | 2014-04-22 | 신규 지환식 에스테르 화합물, (메트)아크릴 공중합체 및 그것을 포함하는 감광성 수지 조성물 |
US14/786,114 US9477151B2 (en) | 2013-04-23 | 2014-04-22 | Alicyclic ester compound, and (meth)acrylic copolymer and photosensitive resin composition containing same |
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JPWO2014175275A1 (ja) | 2017-02-23 |
KR20160003628A (ko) | 2016-01-11 |
US20160070168A1 (en) | 2016-03-10 |
CN105143291A (zh) | 2015-12-09 |
TWI614235B (zh) | 2018-02-11 |
EP2990425A1 (en) | 2016-03-02 |
US9477151B2 (en) | 2016-10-25 |
EP2990425B1 (en) | 2018-05-30 |
TW201509902A (zh) | 2015-03-16 |
JP6274205B2 (ja) | 2018-02-07 |
EP2990425A4 (en) | 2016-12-07 |
CN105143291B (zh) | 2017-03-22 |
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