WO2020196836A1 - ペリクル - Google Patents
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- WO2020196836A1 WO2020196836A1 PCT/JP2020/014049 JP2020014049W WO2020196836A1 WO 2020196836 A1 WO2020196836 A1 WO 2020196836A1 JP 2020014049 W JP2020014049 W JP 2020014049W WO 2020196836 A1 WO2020196836 A1 WO 2020196836A1
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- WIPO (PCT)
- Prior art keywords
- pellicle
- carbon
- polymer
- polymerization initiator
- radical polymerization
- Prior art date
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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
- G03F1/00—Originals for photomechanical production of textured or patterned surfaces, e.g., masks, photo-masks, reticles; Mask blanks or pellicles therefor; Containers specially adapted therefor; Preparation thereof
- G03F1/62—Pellicles, e.g. pellicle assemblies, e.g. having membrane on support frame; Preparation thereof
- G03F1/64—Pellicles, e.g. pellicle assemblies, e.g. having membrane on support frame; Preparation thereof characterised by the frames, e.g. structure or material, including bonding means therefor
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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
- C08F265/00—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00
- C08F265/04—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00 on to polymers of esters
- C08F265/06—Polymerisation of acrylate or methacrylate esters on to polymers thereof
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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
- C08F4/00—Polymerisation catalysts
- C08F4/04—Azo-compounds
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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
- C08F4/00—Polymerisation catalysts
- C08F4/28—Oxygen or compounds releasing free oxygen
- C08F4/32—Organic compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
- C09D4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09D159/00 - C09D187/00
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
- C09J133/04—Homopolymers or copolymers of esters
- C09J133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
- C09J133/08—Homopolymers or copolymers of acrylic acid esters
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/29—Laminated material
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/38—Pressure-sensitive adhesives [PSA]
- C09J7/381—Pressure-sensitive adhesives [PSA] based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/385—Acrylic polymers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2433/00—Presence of (meth)acrylic polymer
Definitions
- the present invention relates to a pellicle used as a dust repellent for a lithography mask in a lithography process such as a semiconductor device such as an LSI or a superLSI or a liquid crystal display panel.
- Pellicle is used for the purpose of preventing foreign matter from adhering to the mask by mounting it on a lithography mask in the lithography process of semiconductor devices such as LSIs and superLSIs and liquid crystal display panels.
- the pellicle usually has a pellicle frame, a transparent pellicle film stretched on the upper end surface thereof, and an adhesive layer provided on the lower end surface for attaching the pellicle to the mask. Since one pellicle is usually used repeatedly, the pressure-sensitive adhesive layer is for fixing the pellicle on the mask so as to be peelable. Therefore, the pressure-sensitive adhesive layer of the pellicle is required to have high load resistance and at the same time suppress the adhesive residue after peeling the pellicle.
- Examples of the adhesive used for the adhesive layer of the pellicle include rubber-based and polyurethane-based adhesives, silicone-based adhesives as described in Patent Document 1, acrylic-based adhesives described in Patent Document 2, and the like. It has been known.
- the wavelength of exposure light has been shortened.
- Examples of short wavelength light include excimer light such as KrF excimer laser and ArF excimer laser. Since such a short wavelength has high energy, it is known that the components of the pressure-sensitive adhesive are easily decomposed during exposure, and the decomposition of the components of the pressure-sensitive adhesive produces an organic gas component called outgas. Outgas is also known to cause stains on pellicle membranes (also called "haze").
- the pellicle of Patent Document 2 uses a (meth) acrylic pressure-sensitive adhesive having an organic gas adsorption performance, which contains a reaction product of a (meth) acrylic acid alkyl ester copolymer and a curing agent.
- a (meth) acrylic pressure-sensitive adhesive having an organic gas adsorption performance which contains a reaction product of a (meth) acrylic acid alkyl ester copolymer and a curing agent.
- the generation of outgas is suppressed by the adsorption of organic gas by the (meth) acrylic pressure-sensitive adhesive, and the generation of haze of the pellicle is suppressed.
- the (meth) acrylic pressure-sensitive adhesive described in Patent Document 2 uses an epoxy-based or isocyanate-based compound as a cross-linking agent. Since the epoxy-based or isocyanate-based compound itself is a highly reactive compound, there is a concern about the stability of the resin composition which is a reaction mixture.
- the present invention provides a resin composition with high solution stability by using a specific polymer (A) together with a radical polymerization initiator (B), and by using the resin composition, there is little adhesive residue.
- An object of the present invention is to provide a pellicle in which the generation of outgas is suppressed.
- the present invention includes a polymer (A) having a structural unit derived from (meth) acrylic acid ester and a side chain composed of a carbon-carbon multiple bond-containing group. It has been found that the solution of the (meth) acrylic pressure-sensitive adhesive containing the radical polymerization initiator (B) has high solution stability. It is considered that this is because the stability of the reaction mixture is enhanced by using a compound having multiple bonds as the main material. Based on these findings, the present invention has been completed.
- a structure containing a (meth) acrylic pressure-sensitive adhesive which is a cured product of a resin composition containing (A) and a radical polymerization initiator (B), and the polymer (A) is derived from a (meth) acrylic acid ester.
- a pressure-sensitive adhesive solution having high solution stability can be obtained by using a specific polymer (A) together with a radical polymerization initiator (B).
- A specific polymer
- B radical polymerization initiator
- the pellicle of the present invention has a pellicle frame, a pellicle film stretched on one end surface of the pellicle frame, and an adhesive layer provided on the other end surface of the pellicle frame.
- the pellicle frame may be one that is usually used as a pellicle frame.
- materials for the pellicle frame include aluminum alloys, stainless steel, polyethylene, black anodized aluminum and the like. Among these, aluminum alloys and black alumite-treated aluminum are preferable because of their light weight.
- the pellicle membrane is fixed to one opening of the pellicle frame.
- the pellicle membrane may be one that is usually used as a pellicle membrane.
- Examples of the material of the pellicle film include nitrocellulose, ethyl cellulose, cellulose acetate, cellulose propionate, pullulan compound, amorphous fluoropolymer, silicone-modified polyvinyl alcohol and the like. Among these, an amorphous fluorine-based polymer having sufficient resistance to excimer light is preferable.
- the adhesive layer contains a (meth) acrylic pressure-sensitive adhesive which is a cured product of a resin composition containing a polymer (A) and a radical polymerization initiator (B).
- the polymer (A) is a polymer having a side chain composed of a structural unit derived from (meth) acrylic acid ester (hereinafter, also referred to as “structural unit (I)”) and a carbon-carbon multiple bond-containing group. Further, it is preferable that the polymer (A) further has a structural unit containing a hydroxy group (hereinafter, also referred to as “structural unit (II)”) in addition to the structural unit (I). Further, it may further have other structural units other than the structural units (I) to (II).
- the polymer (A) further has a side chain composed of carbon-carbon multiple bond-containing groups.
- the carbon-carbon multiple bond-containing group may be contained in the structural unit (II) or other structural unit.
- carbon-carbon multiple bond-containing groups and each structural unit will be described.
- the carbon-carbon multiple bond-containing group is not particularly limited as long as it is a group containing a carbon-carbon double bond and / or a carbon-carbon triple bond.
- Polymerizable carbon-carbon multiple bonds mean ethylenic as well as alkyne carbon-carbon multiple bonds.
- the carbon-carbon double bond-containing group is not particularly limited as long as it is a group containing a carbon-carbon double bond.
- polyethylene glycol # 600 diacrylate, isoprene, diallyl ether, divinylbenzene ((meth) acryloyl group, vinyl group, allyl group, styryl group, etc.) can be mentioned.
- the carbon-carbon triple bond-containing group is not particularly limited as long as it is a group containing a carbon-carbon triple bond.
- hexane-1,5-diine, diethynylbenzene and diethylene glycol bis (2-propynyl) ether can be mentioned.
- a (meth) acrylic group which is a carbon-carbon double bond-containing group, is preferable from the viewpoint of being more excellent in radical stability and reactivity and having a sufficiently large decrease in adhesive strength after heating.
- the polymer (A) may have a multiple bond-containing group in either the side chain or the terminal, but it improves the reactivity of the polymerizable carbon-carbon multiple bond and has the adhesive strength after heating or UV curing. It is preferable to have it in the side chain from the viewpoint of increasing the amount of decrease sufficiently.
- a precursor polymer having a hydroxy group or an epoxy group in the side chain is prepared, and multiple bonds are formed on the hydroxy group or carboxy group of the precursor polymer. It can be obtained by a method of reacting an isocyanate compound and an epoxy compound.
- the range of the multiple bond equivalent which represents the content of the multiple bond-containing group in the polymer (A), is preferably 156 g / mol or more and 100,000 g / mol or less, more preferably 500 g / mol or more and 50,000 g / mol or less. More preferably, it is 1000 g / mol or more and 20,000 g / mol or less.
- the multiple bond equivalent is the solid content mass (g) of the polymer (A) with respect to the total number of moles (mol) of the multiple bonds (that is, double bonds and triple bonds) of the polymer (A), and is represented by the following formula. be able to.
- Multiple bond equivalent (g / mol) mass of solids (g) in polymer (A) / number of moles of multiple bonds of polymer (A).
- the solid content mass of the polymer (A) referred to here is the average molecular weight (Mw) of the polymer (A).
- the number of moles of multiple bonds of the polymer (A) is the number of moles of the compound having a polymerizable multiple bond group located in the side chain.
- the weight average molecular weight (Mw) of the polymer (A) is the polystyrene-equivalent weight average molecular weight by GPC. The measuring method will be described later.
- the number of moles of multiple bonds of the polymer (A) can be calculated from the integrated value of 1 1 H-NMR.
- a solution prepared by adding an arbitrary amount (for example, 0.1 mmol) of a standard reagent (such as styrene) to the polymer (A) is prepared, diluted with a heavy solvent (for example, CDCl 3 ), and sample solution.
- a heavy solvent for example, CDCl 3
- 1 H-NMR is measured on the prepared sample solution to obtain a spectrum.
- the number of moles of multiple bonds can be obtained from the integrated value of the peak derived from the standard reagent and the integrated value of the peak derived from the multiple bond contained in the polymer (A).
- the structural unit (I) is a structural unit derived from the (meth) acrylic acid ester.
- the structural unit (I) has a structure represented by -CH 2- CH (COOCH 3 )-.
- the structural unit (I) is a structural unit derived from a (meth) acrylic acid alkyl ester containing an alkyl group having 4 or more and 10 or less carbon atoms.
- alkyl group having 4 or more and 10 or less carbon atoms include an n-butyl group, an n-pentyl group, an n-hexyl group, an n-octyl group, a 2-ethylhexyl group, an n-decyl group and the like. Of these, n-butyl group and 2-ethylhexyl group are preferable.
- the structural unit (I) is preferably a compound in which the desorbed product derived from the structural unit (I) has a boiling point of 150 ° C. or lower.
- the desorbed product is butanol having a boiling point of 117 ° C.
- the outgas can be easily removed.
- Structural units (I) that produce desorbed products having a boiling point of 150 ° C. or lower include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, and vinyl acetate. Examples thereof include (meth) acrylic acid esters having 5 or less carbon atoms in the ester group.
- the lower limit of the content ratio of the structural unit (I) is preferably 5% by mass, more preferably 10% by mass, further preferably 30% by mass, and 40% by mass. Is particularly preferable.
- the upper limit of the content ratio is preferably 95% by mass, more preferably 80% by mass, further preferably 70% by mass, and particularly preferably 60% by mass.
- the structural unit (II) is a structural unit containing a hydroxy group.
- the adhesive strength is further improved.
- hydroxy group examples include an alcoholic hydroxy group. Of these, an alcoholic hydroxy group is preferable from the viewpoint of reducing adhesive residue.
- Examples of the monomer giving the structural unit (III) include hydroxyalkyl (meth) acrylates such as hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate and hydroxybutyl (meth) acrylate; hydroxyphenyl (meth) acrylate and hydroxynaphthyl.
- Examples thereof include hydroxyaryl (meth) acrylates such as (meth) acrylates.
- hydroxyalkyl (meth) acrylate is preferable, hydroxyalkyl acrylate is more preferable, and hydroxyethyl acrylate is further preferable.
- the lower limit of the content ratio of the structural unit (II) is preferably 1% by mass, more preferably 3% by mass, further preferably 4% by mass, and 5% by mass. Is particularly preferable.
- the upper limit of the content ratio is preferably 30% by mass, more preferably 25% by mass, further preferably 15% by mass, and particularly preferably 10% by mass.
- the weight average molecular weight of the polymer (A) is preferably 10,000 or more and 1 million or less, and more preferably in the range of 30,000 or more and 100,000 or less. When it is within the above range, the cohesive force and the adhesive force of the pressure-sensitive adhesive layer become appropriate, and the adhesive residue is unlikely to remain, which is preferable.
- the weight average molecular weight is the polystyrene-equivalent weight average molecular weight (Mw) obtained by gel permeation chromatography (GPC).
- the lower limit of the molecular weight distribution of the polymer (A), that is, the ratio of Mw (Mw / Mn) to the polystyrene-equivalent number average molecular weight (Mn) by GPC is usually 1, preferably 1.1.
- As the upper limit of the above ratio 5 is preferable, 3 is more preferable, 2 is more preferable, and 1.7 is particularly preferable.
- the molecular weight distribution is in the above range, the degree of cross-linking can be controlled, the control of functional groups which are considered to be bad for the adhesive residue is improved, and the adhesive residue is reduced.
- GPC column For example, two "TSKgel Multipore HXL-M" from Tosoh Corporation, Column temperature: 40 ° C Elution solvent: Tetrahydrofuran (Wako Pure Chemical Industries, Ltd.) Flow rate: 1.0 mL / min Sample concentration: 0.05% by mass Sample injection volume: 100 ⁇ L Detector: Differential refractometer Standard material: Monodisperse polystyrene
- radical polymerization initiator (B) The type of the radical polymerization initiator (B) used for the pressure-sensitive adhesive is not particularly limited, and a photoradical polymerization initiator and a thermal radical polymerization initiator can be used.
- the photoradical polymerization initiator is a compound that generates radicals when irradiated with light, that is, a compound that absorbs light energy and decomposes to generate radical species.
- the thermal radical polymerization initiator refers to a compound that generates radicals by heat, that is, a compound that absorbs thermal energy and decomposes to generate radical species.
- the radical polymerization initiator (B) any one of a photoradical polymerization initiator and a thermal radical polymerization initiator can be used, or a plurality of types of radical polymerization initiators can be used in combination.
- a thermal radical polymerization initiator is preferable to a photoradical polymerization initiator.
- thermal radical polymerization initiator (B) a peroxide-based radical polymerization initiator or an azo-based radical polymerization initiator is preferable.
- peroxide-based radical polymerization initiator examples include the following compounds and commercially available products.
- Ketone peroxides such as Perhexa H, peroxyketals such as Perhexa TMH, hydroperoxides such as Perbutyl H-69, Park Mill D, Perbutyl C, Perbutyl D, Perbutyl O, etc., which are commercially available from NOF CORPORATION.
- Dialkyl peroxides diacyl peroxides such as NOF BW, peroxyesters such as perbutyl Z and perbutyl L, and peroxydicarbonates such as parloyl TCP.
- Trigonox 36-C75 Laurox, Parkadox L-W75, Parkadox CH-50L, Trigonox TMBH, Kayakumen H, Kayabutyl H-70, Parkadox BC-FF, Kayahexa AD, Parkadox 14, Kayabutyl C, Kayabutyl D, Parkadox 12-XL25, Trigonox 22-N70 (22-70E), Trigonox D-T50, Trigonox 423-C70, Kayaester CND-C70, Trigonox 23-C70, Trigonox 257-C70, Kayaester P -70, Kayaester TMPO-70, Trigonox 121, Kayaester O, Kayaester HTP-65W, Kayaester AN, Trigonox 42, Trigonox F-C50, Kayabutyl B, Kayacarboxylic EH, Kayacarboxylic I-20, Kayacarboxylic BIC-75, Trigonox 117 and Kayalen 6-70 are also included
- the peroxide-based radical polymerization initiator may be used alone or in combination of two or more.
- azo radical polymerization initiator examples include compounds having an azo group, such as an azonitrile compound, an azo ester compound, an azoamide compound, an azoamidine compound, an azoimidazoline compound, and a polymer azo compound.
- azonitrile compounds examples include 2,2'-azobis (isobutyronitrile), 2,2'-azobis-2-methylisobutyronitrile, 1,1'-azobis (cyclohexane-1-carbonitrile), 1-[(1-cyano-1-methylethyl) azo] formamide, 2,2'-azobis (4-methoxy-2,4-dimethylvaleronitrile), 2,2'-azobis (2,4-dimethylvalero) Nitrile), 2,2'-azobis (2 methylbutyronitrile), 4,4'-azobis (4-cyanovaleric acid) and the like.
- azoester compounds include dimethyl 2,2'-azobis (2-methylpropionate), dimethyl 1,1'-azobis (1-cyclohexanecarboxylate), 1,1'-azobis- (1-acetoxy-). 1-Phenylethane) and the like are included.
- azoamide compounds examples include 2,2'-azobis [N- (2-propenyl) -2-methylpropionamide], 2,2'-azobis (N-butyl-2-methylpropionamide), 2,2. '-Azobis (N-cyclohexyl-2-methylpropionamide), 2,2'-azobis ⁇ 2-methyl-N- [1,1-bis (hydroxymethyl) -2-hydroxyethyl] propionamide, 2,2 ′ -Azobis [2-methyl-N- (2-hydroxyethyl)] propionamide and the like are included.
- azoamidin compounds examples include 2,2'-azobis (2-methylpropion amidine) dihydrochloride, 2,2'-azobis (N- (2-carboxyethyl) -2-methylpropion amidine) tetrahydrate, 2 , 2'-azobis (2-amidineopropane) dihydrochloride, 2,2'-azobis (1-imino-1-pyrrolidino-2-methylpropane) dihydrochloride and the like are included.
- azoimidazoline compounds examples include 2,2'-azobis [2- [1- (2-hydroxyethyl) -2-imidazolin-2-yl] propane] dihydroxychloride, 2,2'-azobis [2-( 2-Imidazoline-2-yl) propane], 2,2-azobis [2- (2-imidazolin-2-yl) propane] dihydrochloride, 2,2-azobis [2- (2-imidazolin-2-yl) yl) ) Propane] Disulfate dihydrate and the like are included.
- Examples of the polymer azo compound include trade names VPE-0201, VPE-0401, VPE-0601, VPS-1001 (all manufactured by Wako Pure Chemical Industries, Ltd.) and the like.
- the azo radical polymerization initiator may be used alone or in combination of two or more.
- the 10-hour half-life temperature of the radical polymerization initiator (B) is preferably 50 ° C. to 150 ° C., more preferably 60 ° C. to 140 ° C., and even more preferably 70 ° C. to 130 ° C.
- the 10-hour half-life temperature is within the above range, there are few curing defects, so that adhesive residue can be suppressed.
- the value of the 10-hour half-life temperature of the radical polymerization initiator (B) can also be obtained from the literature, and the manufacturer's catalog or the like can be referred to.
- the catalog value of NOF CORPORATION http://www.nov.co.jp/upload_public/sogo/B0100.pdf
- the catalog value of NOF CORPORATION http://www.nov.co.jp/upload_public/sogo/B0100.pdf
- the photoradical polymerization initiator (B) that can be used in the present invention is not particularly limited as long as it exhibits absorbability to a light source used during photocuring.
- a light source used during photocuring For example, 2,2-dimethoxy-1,2-diphenylethane-1-one, 1-hydroxy-cyclohexyl-phenyl-ketone, 1- [4- (2-hydroxyethoxy) -phenyl] -2-hydroxy-2- Methyl-1-propane-1-one, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropane-1-one, 2-benzyl-2-dimethylamino-1- (4-morpho) Renophenyl) -1-butanone, bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide, 2-hydroxy-1- ⁇ 4- [4- (2-hydroxy-2-methyl-propionyl) -benzyl ] -Phenyl ⁇ -2-
- the above compounds are available as commercial products, and are OMNIRAD1000, 248, 481, 4817, 4MBZ-flakes, 500, 659, 73, 784, 81, BDK, MBS, and MBS.
- the amount of the radical polymerization initiator (B) to be blended is preferably 0.01 to 10 parts by mass, more preferably 0.05 to 5 parts by mass with respect to 100 parts by mass of the polymer (A). If the blending amount is 0.01 parts by mass or more, the curability is sufficient, and if it is 10 parts by mass or less, a large amount of outgas derived from the initiator is not generated.
- the resin composition according to the present invention preferably further contains a cross-linking agent (C).
- the cross-linking agent (C) is a component capable of forming a cross-linked structure on the polymer (A) by heating.
- a pressure-sensitive adhesive layer having a cross-linked structure can be formed.
- the cross-linking agent (C) is preferably a compound having a polyfunctional carbon-carbon multiple bond, and a polyfunctional (meth) acrylate is particularly preferable.
- the polyfunctional (meth) acrylate is not particularly limited as long as it has 2 or more and 10 or less (meth) acryloyl groups, but it is preferable that the number of (meth) acryloyl groups is 2 or more and 6 or less.
- polyfunctional (meth) acrylate used as the cross-linking agent (C) include the following compounds. Alkyl (meth) acrylate, hydroxyl group-containing alkyl acrylate, polyalkylene glycol acrylate, dioxane acrylate, tricyclodecanol acrylate, fluorene acrylate, alkoxylated bisphenol A acrylate, (alkoxylated) trimethylolpropane acrylate, alkoxylated serine acrylate, ( Caprolactone-modified) isocyanurate acrylate, pentaerythritol acrylate, alkoxylated pentaerythritol acrylate, (alkoxylated) pentaerythritol acrylate, (alkoxylated) ditrimethylolpropane acrylate, (alkoxylated) dipentaerythritol acrylate.
- Preferred examples of the polyfunctional acrylate compound are polyethylene glycol # 400 diacrylate (NK ester A-400 (molecular weight 508)) and polyethylene glycol # 600 diacrylate (NK ester A-600 (molecular weight 742)) manufactured by Shin-Nakamura Chemical Co., Ltd. )), A-DOD-N, A-BPE-10, A-GLY-9E, A-9300, A-9300-1CL, AD-TMP-L.
- the cross-linking agent (C) is more preferably a bifunctional or higher functional (meth) acrylate curing agent containing 2 or more and 10 or less acrylate groups in one molecule.
- Specific examples of such compounds include glycerolpropyl-added tri (meth) acrylate, ditrimethyloltetra (meth) acrylate, and dipentaerythritol penta (meth) acrylate.
- the content of the carbon-carbon multiple bond contained in the cross-linking agent (C) is not particularly limited, but the multiple bond equivalent thereof is preferably 60 g / mol or more and 1000 g / mol or less, and more preferably 80 g / mol or more and 900 g / mol or less. , 100 g / mol or more and 700 g / mol or less is more preferable, and 200 g / mol or more and 400 g / mol or more is further preferable.
- the multiple bond equivalent can be determined by the method described above in relation to the polymer (A).
- the blending amount of the cross-linking agent (C) is preferably 0 parts by mass or more and 20 parts by mass or less, and more preferably 0.5 parts by mass or more and 5 parts by mass or less with respect to 100 parts by mass of the polymer (A).
- the resin composition according to the present invention may contain other optional components in addition to the above components.
- Optional components include, for example, antioxidants, antioxidants, UV absorbers, light stabilizers, defoamers, leveling agents, antistatic agents, surfactants, storage stabilizers, thermal polymerization inhibitors, plasticizers, etc. Examples thereof include a wettability improving agent, an adhesion imparting agent, an antistatic agent (tacky fire), and an organic solvent.
- These optional components may be one kind, but two or more kinds may be added.
- Such an optional component may be added in an amount that does not impair the effects of the present invention.
- the blending amount thereof is 0 parts by mass or more and 10 parts by mass or less with respect to 100 parts by mass of the total mass of the pressure-sensitive adhesive. is there.
- the method for producing the (meth) acrylic pressure-sensitive adhesive that forms the pressure-sensitive adhesive layer of the pellicle is not particularly limited, and the pressure-sensitive adhesive can be produced by a known method.
- the above-mentioned polymer (A), the radical polymerization initiator (B), and optionally the cross-linking agent (C), the organic solvent, and other components are mixed in the above-mentioned blending amounts to obtain a resin composition.
- a (meth) acrylic pressure-sensitive adhesive can be obtained.
- the viscosity of the resin composition is not particularly limited, but if it is too high, it will be difficult to apply it uniformly. Therefore, it is preferable that the resin composition has high solution stability because it is easy to apply when the pressure-sensitive adhesive layer is provided on the pellicle frame.
- the solution stability is high because the viscosity 72 hours after the preparation of the resin composition does not significantly increase with respect to the viscosity immediately after the preparation (initial viscosity).
- the rate of increase in viscosity after 72 hours at room temperature after adjusting the resin composition is preferably less than 30% as compared with the initial viscosity immediately after preparation.
- a resin composition having a low rate of increase in viscosity after storage, that is, having high solution stability is preferable because the amount of the coating solution applied during the disvenger coating is stable and the yield in the coating process is reduced.
- the viscosity of the resin composition (initial viscosity and viscosity after storage) can be measured with an E-type viscometer.
- a (meth) acrylic pressure-sensitive adhesive can be obtained by curing the resin composition according to the present invention.
- the curing method and the like refer to step 2) of the following pellicle manufacturing method.
- the pellicle of the present invention can be produced in the same manner as a conventional pellicle except that an adhesive layer using the (meth) acrylic pressure-sensitive adhesive described above is provided.
- a pellicle can be obtained by 1) stretching a pellicle film on the end face of one opening of the pellicle frame, and 2) providing an adhesive layer on the end face of the opposite opening of the pellicle frame. It should be noted that steps 1) and 2) can be carried out by changing the order.
- a pellicle film is stretched on one opening of the pellicle frame.
- the pellicle film can be applied by a usual method.
- a commonly used adhesive may be applied to one end face of the pellicle frame to form an adhesive layer, and the pellicle film may be fixed on the adhesive layer.
- the adhesive may be a known one, and may be, for example, a cellulose derivative, chlorinated polypropylene, a polyamide adhesive, a fluororesin adhesive, an acrylic adhesive, an epoxy resin, a polyimide adhesive, or the like.
- step 2 an adhesive layer is provided on the end face of the opening of the pellicle frame on the side opposite to the pellicle film stretched.
- the resin composition itself or a coating solution containing the resin composition is prepared, applied to the end face of the opening of the pellicle frame, dried and cured to form an adhesive, and the adhesive layer is formed. ..
- the coating solution may further contain an organic solvent together with the resin composition.
- the solvent include the following compounds. Aromatic solvents such as toluene and xylene; ketone solvents such as acetone, methyl ethyl ketone, methyl isobutyl ketone and 2-methyl-5-hexanone; ester solvents such as ethyl acetate and butyl acetate; methyl chloride, dichloromethane, dichloroethane and the like Halogen solvent; Glycol ether solvents such as ethylene glycol monoethyl ether, propylene glycol monomethyl ether, propylene glycol mono n-propyl ether and propylene glycol; glycol ether carboxylate solvents such as propylene glycol monomethyl ether acetate.
- the organic solvent may be one kind, but two or more kinds may be mixed and used.
- the boiling point of the organic solvent (that is, the boiling point of the solvent used in the case of one kind) (that is, the boiling point of the mixture in the case of two or more kinds) is preferably 150 ° C. or less. Since the thermal decomposition start temperature of the (meth) acrylic polymer used as the polymer (A) is around 150 ° C., if the boiling point of the organic solvent used is 150 ° C. or lower, the polymer (A) can be decomposed at 150 ° C. It is possible to remove the organic solvent without heating to the vicinity.
- the amount of the organic solvent to be blended is not particularly limited, but is usually 0 parts by mass or more and 90 parts by mass or less, and 0 parts by mass or more and 50 parts by mass or less, based on 100 parts by mass of the entire coating solution. preferable.
- the resin composition or coating solution can be applied by any coating means, for example, by a spray coating method, a dipping coating method, a brush coating method, a spatula coating method, a roller coating method, a casting coating method, or the like. It can be carried out.
- a spray coating method for example, after dropping droplets on the surface of a pellicle frame, the droplets can be stretched by a jig and coated to a uniform thickness.
- the (meth) acrylic pressure-sensitive adhesive after application is dried and then cured by heating or light irradiation to obtain a pressure-sensitive adhesive. Drying and curing may be performed at the same time.
- the heating conditions it can be carried out at a temperature of 40 ° C. to 170 ° C. for 10 minutes to 2880 minutes.
- the condition of light irradiation it can be carried out in 10 minutes to 30 minutes under the condition of a wavelength of 254 nm to 365 nm.
- the thickness of the adhesive obtained in this way is not particularly limited, but is generally 0.2 mm or more and 0.8 mm or less. Further, it is preferably 0.1 mm or more from the viewpoint of enabling uniform coating on the mask.
- the adhesive obtained as described above is used as the adhesive layer.
- a protective film can also be attached to the adhesive layer.
- a polyester film or a polyethylene film that has been subjected to a mold release treatment with silicone or fluorine can be used as the protective film.
- the pressure-sensitive adhesive layer can be further flattened.
- the thickness of the pressure-sensitive adhesive layer can be adjusted and the flatness thereof can be increased.
- the pellicle can be flattened by sandwiching the pellicle in a surface plate having a high flatness and performing curing and molding in two steps.
- the molding temperature can be appropriately determined according to the composition of the pressure-sensitive adhesive, but the curing temperature of the first stage is preferably about 40 ° C. to 150 ° C., and the molding temperature of the second stage is 60 ° C. to 200 ° C. It is preferably about ° C.
- volatile components can be removed.
- the volatile components can be removed by heating and drying the pellicle at 150 ° C. for 4 hours or 120 ° C. for 20 hours under conditions where the adhesive layer and the pellicle film do not deteriorate.
- the pellicle thus obtained is mounted on the mask via the adhesive layer. As a result, it is possible to prevent foreign matter from adhering to the mask. Foreign matter adhering to the mask causes poor resolution on the wafer when the exposure light is focused on it. Therefore, the pellicle is mounted so as to cover the exposed area of the mask.
- a mask is a glass substrate or the like on which a patterned light-shielding film is arranged.
- the light-shielding film can be a metal film such as Cr or MoSi.
- the exposure light is incident from a part other than the light-shielding film of the mask and passes through the pellicle film.
- the exposure light is usually incident substantially parallel to the normal of the pellicle film, but may be incident diagonally to the normal of the pellicle film.
- the exposure light used for lithography such as the process of forming a circuit pattern drawn on a semiconductor element is short such as i-line (wavelength 365 nm) of a mercury lamp, KrF excimer laser (wavelength 248 nm), and ArF excimer laser (wavelength 193 nm). It can be excimer light of wavelength or the like.
- the pressure-sensitive adhesive layer contains a polymer (A) having a side chain consisting of a structural unit derived from (meth) acrylic acid ester and a carbon-carbon multiple bond-containing group, and a radical polymerization initiator (B). Since it is a (meth) acrylic pressure-sensitive adhesive, it can have good adhesiveness and good light resistance to short-wavelength light such as excimer light.
- Radical polymerization initiator (B) Parkadox 12-XL25: Peroxide-based radical polymerization initiator (thermal radical polymerization initiator) manufactured by Kayaku Akzo Corporation Omnirad 1173: IGM Resins B. V. 2-Hydroxy-2-methyl-1-phenyl-propane-1-one, a photopolymerization initiator manufactured by the company.
- Crosslinking agent (C) A-600 "NK Ester A-600” manufactured by Shin-Nakamura Chemical Industry Co., Ltd. (Number of acrylate groups: 2)
- L-45 Isocyanate-based curing agent "L-45” manufactured by Soken Chemical Co., Ltd.
- Example 1 Preparation of resin composition 1 To 100 parts by mass of "Art Cure RA-341" (solid content concentration: 100%) manufactured by Negami Kogyo Co., Ltd., 65 parts by mass of toluene was added to room temperature. The polymer (A) having a solid content concentration of 35% was prepared by stirring with. 1.0 part by mass of the cross-linking agent (C) (“NK ester A-600” manufactured by Shin-Nakamura Chemical Industry Co., Ltd., solid content concentration: 100%) with respect to 100 parts by mass of the polymer (A), and a peroxide-based radical.
- C cross-linking agent
- Example 2 Preparation of Resin Composition 2 To 100 parts by mass of "Art Cure RA-331P” (solid content concentration: 45%) manufactured by Negami Kogyo Co., Ltd., 10 parts by mass of toluene was added, and the mixture was stirred at room temperature and solidified. The polymer (A) having a concentration of 35% was prepared. 1.0 part by mass of the cross-linking agent (C) (“NK ester A-600” manufactured by Shin-Nakamura Chemical Industry Co., Ltd., solid content concentration: 100%) with respect to 100 parts by mass of the polymer (A), and a peroxide-based radical.
- C cross-linking agent
- Example 3 Preparation of Resin Composition 3 To 100 parts by mass of "Art Cure DT-7" (solid content concentration: 45%) manufactured by Negami Kogyo Co., Ltd., 10 parts by mass of toluene was added, and the mixture was stirred at room temperature and solidified. The polymer (A) having a concentration of 35% was prepared. 1.0 part by mass of the cross-linking agent (C) (“NK ester A-600” manufactured by Shin-Nakamura Chemical Industry Co., Ltd., solid content concentration: 100%) with respect to 100 parts by mass of the polymer (A), and a peroxide-based radical.
- C cross-linking agent
- Example 4 Preparation of Resin Composition 4 A resin composition was prepared in the same manner as in Example 1 except that the cross-linking agent (C) was not used, to obtain a resin composition 4.
- Example 5 Preparation of Resin Composition 5 A resin composition was prepared in the same manner as in Example 4 except that the amount of the peroxide-based radical polymerization initiator (B) was changed to 2.7 parts by mass, and the resin composition was prepared. I got the thing 5.
- Article Cure RA-341 solid content concentration: 100%
- B Peroxide-based radical polymerization initiator
- Comparative Example 2 Preparation of Adhesive Solution 10 0.09 parts by mass of L-45 (solid content concentration: 45%) was used as the cross-linking agent (C) without using the peroxide-based radical polymerization initiator (B). A resin composition was prepared in the same manner as in Example 1 except for use, and a resin composition 10 was obtained.
- a pellicle film 12 was attached to the other end face of the pellicle frame 14 via a film adhesive 13 to obtain a pellicle 10.
- the irradiation amount was adjusted so that the dose amount was 410 mJ / cm 2 , and the photocuring treatment was performed.
- Viscosity change rate is less than 10%
- Viscosity change rate is 10% or more
- the protective film was peeled off from the adhesive-attached pellicle obtained in each example.
- a weight (10 kg, 30 seconds) of the pellicle was attached to the quartz substrate using a simple mounter, and a base plate to which the pellicle was attached was obtained.
- the base plate After leaving the base plate to which the pellicle is attached at room temperature (20 ⁇ 3 ° C.) for 24 hours, the base plate is fixed horizontally, and ArF light (energy density 15 J / cm 2) having a wavelength of 193 nm and 5 mm square from the quartz substrate side is used. , Frequency: 10 Hz).
- ArF light energy density 15 J / cm 2 having a wavelength of 193 nm and 5 mm square from the quartz substrate side is used. , Frequency: 10 Hz).
- the long side of the pellicle was pulled up by a tensile tester to peel the pellicle from the substrate.
- Residual glue area is 0% or more and 20% or less of the entire pasting area
- Residual glue area is more than 20% and 100% or less of the entire pasting area
- the measurement conditions for GC-MS are as follows. Measuring device name: QP2010plus Column: DB-1 (inner diameter: 0.32 mm, length: 60.0 m, thickness: 1.00 ⁇ m) Scan range: 35-450 m / z Ionization: 0.78 kV Measurement method: Calculate the amount of gas generated at 100 ° C for 30 minutes in terms of decan
- outgas was evaluated according to the following criteria. ⁇ : Total amount of outgas generated from the adhesive layer for one pellicle ⁇ 10 ppm X: Total amount of outgas generated from the adhesive layer for one pellicle> 10 ppm
- the pressure-sensitive adhesive solutions of Comparative Examples 1 to 3 containing no radical polymerization initiator (B) had a viscosity change rate of 10% or more after storage for 5 hours.
- the pressure-sensitive adhesive solution of Comparative Example 1 had an initial viscosity of 2597 mPa ⁇ S, a viscosity after storage for 5 hours was 4469 mPa ⁇ S, which is the measurement limit of the measuring device, and the degree increase rate was 72%. Therefore, the viscosity increase rate far exceeded 10%, and the solution stability was low.
- Pellicle 12 Pellicle film 13 Adhesive layer 14 Pellicle frame
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Abstract
Description
[1] ペリクル枠と、前記ペリクル枠の一端面に張設されたペリクル膜と、前記ペリクル枠の他端面に設けられた粘着剤層とを有するペリクルであって、前記粘着剤層が、ポリマー(A)と、ラジカル重合開始剤(B)とを含む樹脂組成物の硬化物である(メタ)アクリル系粘着剤を含み、前記ポリマー(A)が、(メタ)アクリル酸エステルに由来する構造単位、及び炭素-炭素多重結合含有基からなる側鎖を有する、ペリクル。
[2] 前記ポリマー(A)の多重結合当量が、156g/mol以上100,000g/mol以下である、[1]に記載のペリクル。
[3] 前記炭素-炭素多重結合含有基が、炭素-炭素二重結合含有基である、[1]または[2]に記載のペリクル。
[4] 前記ポリマー(A)の重量平均分子量が、1万以上100万以下である、[1]~[3]のいずれかに記載のペリクル。
[5] 前記ラジカル重合開始剤(B)が、熱ラジカル重合開始剤である、[1]~[4]のいずれかに記載のペリクル。
[6] 前記ラジカル重合開始剤(B)が、過酸化物系ラジカル重合開始剤またはアゾ系ラジカル重合開始剤である、[5]に記載のペリクル。
[7] 前記樹脂組成物が、架橋剤(C)をさらに含む、[1]~[6]のいずれかに記載のペリクル。
[8] 前記架橋剤(C)が、多官能性の炭素-炭素多重結合を有する化合物である、[7]に記載のペリクル。
本発明のペリクルは、ペリクル枠と、ペリクル枠の一端面に張設されたペリクル膜と、ペリクル枠の他端面に設けられた粘着剤層とを有する。
ペリクル枠は、ペリクル枠として通常用いられるものであってもよい。ペリクル枠の材質の例には、アルミニウム合金、ステンレス鋼、ポリエチレン、黒色アルマイト処理したアルミニウムなどが含まれる。これらの中でも、軽量であることなどから、アルミニウム合金や黒色アルマイト処理したアルミニウムなどが好ましい。
ペリクル膜は、ペリクル枠の一方の開口部に固定されている。ペリクル膜は、ペリクル膜として通常用いられているものであってよい。ペリクル膜の材質は、例えばニトロセルロース、エチルセルロース、酢酸セルロース、プロピオン酸セルロース、プルラン化合物、非晶性フッ素系重合体、シリコーン変性ポリビニルアルコールなどが挙げられる。これらの中でも、エキシマ光に対して充分な耐性を有する非晶性フッ素系重合体が好ましい。
粘着剤層は、ポリマー(A)と、ラジカル重合開始剤(B)とを含む樹脂組成物の硬化物である(メタ)アクリル系粘着剤を含む。
ポリマー(A)は、(メタ)アクリル酸エステルに由来する構造単位(以下、「構造単位(I)」ともいう)、及び炭素-炭素多重結合含有基からなる側鎖を有するポリマーである。また、ポリマー(A)は、構造単位(I)以外に、ヒドロキシ基を含む構造単位(以下、「構造単位(II)」ともいう)をさらに有することが好ましい。また、構造単位(I)~(II)以外のその他の構造単位をさらに有していてもよい。
炭素-炭素多重結合含有基は、炭素-炭素二重結合および/または炭素-炭素三重結合を含む基である限り特に限定はない。重合性炭素-炭素多重結合は、エチレン性ならびにアルキン性の炭素-炭素多重結合を意味する。
多重結合当量(g/mol)=ポリマー(A)中の固形分質量(g)/ポリマー(A)の多重結合のモル数。
尚、ここでいうポリマー(A)の固形分質量とは、ポリマー(A)の平均分子量(Mw)である。また、ポリマー(A)の多重結合のモル数は、側鎖に位置する重合性多重結合基を有する化合物のモル数である。
構造単位(I)は、(メタ)アクリル酸エステルに由来する構造単位である。構造単位(I)は、-CH2-CH(COOCH3)-で表される構造を有している。
構造単位(II)は、ヒドロキシ基を含む構造単位である。ポリマー(A)が構造単位(II)を有することで、粘着力がより向上する。
GPCカラム:例えば東ソー社の「TSKgel Multipore HXL-M」2本、
カラム温度:40℃
溶出溶媒:テトラヒドロフラン(和光純薬工業社)
流量: 1.0mL/分
試料濃度: 0.05質量%
試料注入量:100μL
検出器:示差屈折計
標準物質:単分散ポリスチレン
粘着剤に使用するラジカル重合開始剤(B)の種類に特に限定はなく、光ラジカル重合開始剤および熱ラジカル重合開始剤を使用することができる。
本発明に係る樹脂組成物は、架橋剤(C)をさらに含むことが好ましい。
架橋剤(C)は、加熱によってポリマー(A)に架橋構造を形成することができる成分である。当該樹脂組成物が架橋剤(C)をさらに含むことで、架橋構造を有する粘着剤層を形成することができる。
尚、多重結合当量は、ポリマー(A)に関連して上述した方法により求めることができる。
本発明に係る樹脂組成物は、上記成分に加えて、その他の任意成分を含有してもよい。任意成分としては、例えば、酸化防止剤、老化防止剤、紫外線吸収剤、光安定剤、消泡剤、レベリング剤、帯電防止剤、界面活性剤、保存安定剤、熱重合禁止剤、可塑剤、濡れ性改良剤、密着性付与剤、粘着付与剤(タッキーファイヤー)、有機溶媒等が挙げられる。これら任意成分は1種でもよいが、2種以上を加えることもできる。
ペリクルの粘着剤層を形成する(メタ)アクリル系粘着剤の製造方法に特に限定はなく、粘着剤の製造方法として公知の方法で製造することができる。例えば、上述したポリマー(A)と、ラジカル重合開始剤(B)と、所望により架橋剤(C)、有機溶媒およびその他の成分を、上述した配合量で混合することで、樹脂組成物を得て、当該樹脂組成物を硬化することで、(メタ)アクリル系粘着剤を得ることができる。
本発明のペリクルは、上述した(メタ)アクリル系粘着剤を用いた粘着層を設けること以外は、従来のペリクルと同様に製造することができる。例えば、1)ペリクル枠の一方の開口部の端面にペリクル膜を張設し、2)次にペリクル枠の反対の開口部の端面に粘着剤層を設けることで、ペリクルを得ることができる。尚、ステップ1)および2)は、順番を入れ替えて実施することもできる。
ペリクル枠の一方の開口部に、ペリクル膜を張設する。ペリクル膜の張設は、通常の方法で行うことができる。例えば、通常用いられる接着剤を、ペリクル枠の一方の端面に塗布して接着剤層を形成し、当該接着剤層上にペリクル膜を固定すればよい。
次に、ペリクル膜を張設したのと反対側のペリクル枠の開口部の端面に、粘着剤層を設ける。粘着層の形成には、上記樹脂組成物そのものまたは樹脂組成物を含む塗工溶液を調製し、ペリクル枠の開口部の端面に塗布し、乾燥及び硬化させて粘着剤とし、粘着層を形成する。
トルエン、キシレン等の芳香族系溶媒;アセトン、メチルエチルケトン、メチルイソブチルケトン、2-メチル-5-ヘキサノン等のケトン系溶媒;酢酸エチル、酢酸ブチル等のエステル系溶媒;塩化メチル、ジクロロメタン、ジクロロエタン等のハロゲン系溶媒;
エチレングリコールモノエチルエーテル、プロピレングリコールモノメチルエーテル、プロピレングリコールモノn-プロピルエーテル、プロピレングリコール等のグリコールエーテル系溶媒;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グリコールエーテルカルボキシレート系溶媒。
有機溶媒は1種でもよいが、2種以上を混合して用いることもできる。
このようにして得られるペリクルは、上記粘着層を介してマスク上に装着される。それにより、マスクに異物が付着するのを防止しうる。マスクに付着した異物は、それに露光光の焦点が合うと、ウェハへの解像不良を引き起こす。そのため、ペリクルは、マスクの露光エリアを覆うように装着される。
以下の実施例および比較例において、下記の材料を使用した。
RA-341:根上工業社製の「アートキュアRA-341」(多重結合当量:13000g/mol、重量平均分子量:80000)
RA-331P:根上工業社製の「アートキュアRA-331P」(多重結合当量:7500g/mol、重量平均分子量:100000)
DT-7:根上工業社製(多重結合当量:1600g/mol、重量平均分子量:200000)
SKダイン1495:綜研化学社製のアクリル酸エステル共重合物(多重結合当量:0g/mol)
パーカドックス12-XL25:化薬アクゾ社製の過酸化物系ラジカル重合開始剤(熱ラジカル重合開始剤)
Omnirad1173:IGM Resins B.V.社製の光重合開始剤、2-ヒドロキシ-2-メチル-1-フェニル-プロパン-1-オン
A-600:新中村化学工業社製の「NKエステルA-600」(アクリレート基の数:2個)
L-45:綜研化学社製のイソシアネート系硬化剤「L-45」
実施例1: 樹脂組成物1の調製
根上工業社製の「アートキュアRA-341」(固形分濃度:100%)100質量部に、トルエンを65質量部を添加し、室温で攪拌し、固形分濃度35%のポリマー(A)を調整した。ポリマー(A)100質量部に対し架橋剤(C)(新中村化学工業社製の「NKエステルA-600」、固形分濃度:100%)を1.0質量部と、過酸化物系ラジカル重合開始剤(B)(化薬アクゾ社製の「パーカドックス12-XL25」、固形分濃度:25%)を0.22質量部添加し、室温で攪拌することで、固形分濃度比でRA-341:A-600:パーカドックス12-XL25=100:2.86:0.16の樹脂組成物1を得た。
根上工業社製の「アートキュアRA-331P」(固形分濃度:45%)100質量部に、トルエンを10質量部を添加し、室温で攪拌し、固形分濃度35%のポリマー(A)を調整した。ポリマー(A)100質量部に対し架橋剤(C)(新中村化学工業社製の「NKエステルA-600」、固形分濃度:100%)を1.0質量部と、過酸化物系ラジカル重合開始剤(B)(化薬アクゾ社製の「パーカドックス12-XL25」、固形分濃度:25%)を0.22質量部添加し、室温で攪拌することで、固形分濃度比でRA-331P:A-600:パーカドックス12-XL25=100:2.86:0.16の樹脂組成物2を得た。
根上工業社製の「アートキュアDT-7」(固形分濃度:45%)100質量部に、トルエンを10質量部を添加し、室温で攪拌し、固形分濃度35%のポリマー(A)を調整した。ポリマー(A)100質量部に対し架橋剤(C)(新中村化学工業社製の「NKエステルA-600」、固形分濃度:100%)を1.0質量部と、過酸化物系ラジカル重合開始剤(B)(化薬アクゾ社製の「パーカドックス12-XL25」、固形分濃度:25%)を0.22質量部添加し、室温で攪拌することで、固形分濃度比でDT-7:A-600:パーカドックス12-XL25=100:2.86:0.16の樹脂組成物3を得た。
架橋剤(C)を使用しないこと以外は実施例1と同様に樹脂組成物を調製し、樹脂組成物4を得た。
過酸化物系ラジカル重合開始剤(B)の量を2.7質量部に変更したこと以外は実施例4と同様に樹脂組成物を調製し、樹脂組成物5を得た。
根上工業社製の「アートキュアRA-341」(固形分濃度:100%)100質量部に、トルエンを32質量部を添加し、室温で攪拌し、固形分濃度68%のポリマー(A)を調整した。ポリマー(A)100質量部に対し、過酸化物系ラジカル重合開始剤(B)(化薬アクゾ社製の「パーカドックス12-XL25」、固形分濃度:25%)を2.7質量部添加し、室温で攪拌することで、固形分濃度比でRA-341:パーカドックス12-XL25=100:1の樹脂組成物6を得た。
根上工業社製の「アートキュアRA-341」(固形分濃度:100%)100質量部に、過酸化物系ラジカル重合開始剤(B)(化薬アクゾ社製の「パーカドックス12-XL25」、固形分濃度:25%)を4質量部添加し、室温で攪拌することで、固形分濃度比でRA-341:パーカドックス12-XL25=100:1の樹脂組成物7を得た。
根上工業社製の「アートキュアRA-341」(固形分濃度:100%)100質量部に、過酸化物系ラジカル重合開始剤(B)(化薬アクゾ社製の「パーカドックス12-XL25」、固形分濃度:25%)を4質量部と光ラジカル開始剤(BASF社製の「omnirad1173」)を0.01質量部添加し、室温で攪拌することで、固形分濃度比でRA-341:パーカドックス12-XL25:omnirad1173=100:1:0.01の樹脂組成物8を得た。
ポリマー(A)(アクリル樹脂SKダイン1495、固形分濃度:35%)100質量部に対し、架橋剤(C)としてL-45(固形分濃度:45%)を0.09質量部添加し、混合して固形分濃度比でSKダイン1495:L-45=100:0.12の粘着剤溶液9を得た。
過酸化物系ラジカル重合開始剤(B)を使用せず、架橋剤(C)として0.09質量部のL-45(固形分濃度:45%)を使用すること以外は実施例1と同様に樹脂組成物を調製し、樹脂組成物10を得た。
ポリマー(A)(アクリル樹脂SKダイン1495、固形分濃度:100%)100質量部に対し、架橋剤(C)としてL-45(固形分濃度:45%)を0.09質量部添加し、混合して固形分濃度比でSKダイン1495:L-45=100:0.04の樹脂組成物11を得た。
上記樹脂組成物1~11をそれぞれ使用し、図1に示したようなペリクルを作製した。
陽極酸化処理したアルミニウム製のペリクルフレーム14(外寸:149mm×122mm、枠高さH:5.8mm、枠幅W:2mm)を用意した。そして、当該ペリクルフレーム14の一方の端面に、粘着剤溶液をディスペンサーで塗布した。これを加熱乾燥(60℃30分)させた。接着剤層の表面にセパレータを貼付け平坦面に押し付け、更に加熱成形(120℃30分)を行った。ペリクルフレーム14の他方の端面上に、膜接着剤13を介してペリクル膜12を貼付けしてペリクル10を得た。
尚、実施例8においては、加熱乾燥後に、ドーズ量が410mJ/cm2になるよう照射量を調節して、光硬化処理を行った。
4-1.溶液安定性
上記で調製した各樹脂組成物の溶液安定性を次の方法で評価した。
樹脂組成物の調製直後に、L型粘度計(東機産業株式会社、TV-22L)を用いて、初期粘度を測定した。
次に、樹脂組成物を、25℃で5時間保存した。保存後の樹脂組成物について、初期粘度と同様にL型粘度計を用いて粘度を測定し、保存後粘度を得た。次に保存後の粘度変化率(%)を下記式に基づいて計算した。
粘度変化率(%)=[(保存後粘度-初期粘度)/初期粘度]×100
○: 粘度変化率が10%未満
×: 粘度変化率が10%以上
各実施例で得た粘着剤付ペリクルについて、保護フィルムを剥がした。石英基板に対して、簡易型マウンターを使用して、当該ペリクルの加重(10kg、30秒)貼付を行い、ペリクルを貼り付けた基版を得た。ペリクルを貼り付けた基版を、室温(20±3℃)にて24時間放置後、基版を水平に固定し、石英基板側から5mm角の波長193nmのArF光(エネルギー密度15J/cm2、頻度:10Hz)を照射した。次にペリクルの長辺を引張試験機により引き上げ、ペリクルを基板から剥離させた。各被着体(石英基板)表面の様子を観察し、糊残りを以下の基準に従って評価した。
○: 糊残り面積が、貼付け面積全体の0%以上、20%以下
×: 糊残り面積が、貼付け面積全体の20%超、100%以下
粘着剤付きペリクルから粘着剤を10mg剥がし、得られた粘着剤10mgを2口のキャップが付いたガラスインサートに入れ、加熱脱着装置(TDTS-2020、アジレント・テクノロジー株式会社製)にセットした。片側からキャリアガスとしてH2ガスを流し込みながら100℃で30分間加熱して揮発性成分を抽出後、-20℃のコールドトラップで凝集した。次いで、コールドトラップを10℃/分で280℃まで再加熱し、抽出し、凝集させた揮発性成分について、ガスクロマトグラフ(GC)及び質量分析計を用いて発生ガス量(デカン換算)を測定し、アウトガスの発生量とした。GC-MSの測定条件は以下の通りである。
測定装置名: QP2010plus
カラム: DB-1(内径:0.32mm、長さ:60.0m、厚み:1.00μm)
スキャン範囲: 35~450m/z
イオン化: 0.78kV
測定方法:100℃、30分で発生したガス量をデカン換算で算出
○:ペリクル1枚分の粘着剤層から発生する総アウトガス量≦10ppm
×:ペリクル1枚分の粘着剤層から発生する総アウトガス量>10ppm
尚、表中の「nv」は、固形分濃度である。
12 ペリクル膜
13 粘着剤層
14 ペリクル枠
Claims (8)
- ペリクル枠と、
前記ペリクル枠の一端面に張設されたペリクル膜と、
前記ペリクル枠の他端面に設けられた粘着剤層とを有するペリクルであって、
前記粘着剤層が、ポリマー(A)と、ラジカル重合開始剤(B)とを含む樹脂組成物の硬化物である(メタ)アクリル系粘着剤を含み、前記ポリマー(A)が、(メタ)アクリル酸エステルに由来する構造単位、及び炭素-炭素多重結合含有基からなる側鎖を有する、ペリクル。 - 前記ポリマー(A)の多重結合当量が、156g/mol以上100,000g/mol以下である、請求項1に記載のペリクル。
- 前記炭素-炭素多重結合含有基が、炭素-炭素二重結合含有基である、請求項1または2に記載のペリクル。
- 前記ポリマー(A)の重量平均分子量が、1万以上100万以下である、請求項1~3のいずれか一項に記載のペリクル。
- 前記ラジカル重合開始剤(B)が、熱ラジカル重合開始剤である、請求項1~4のいずれか一項に記載のペリクル。
- 前記ラジカル重合開始剤(B)が、過酸化物系ラジカル重合開始剤またはアゾ系ラジカル重合開始剤である、請求項5に記載のペリクル。
- 前記樹脂組成物が、架橋剤(C)をさらに含む、請求項1~6のいずれか一項に記載のペリクル。
- 前記架橋剤(C)が、多官能性の炭素-炭素多重結合を有する化合物である、請求項7に記載のペリクル。
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