WO2023214540A1 - 感光性樹脂組成物、感光性エレメント、プリント配線板、及びプリント配線板の製造方法 - Google Patents
感光性樹脂組成物、感光性エレメント、プリント配線板、及びプリント配線板の製造方法 Download PDFInfo
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- WO2023214540A1 WO2023214540A1 PCT/JP2023/016740 JP2023016740W WO2023214540A1 WO 2023214540 A1 WO2023214540 A1 WO 2023214540A1 JP 2023016740 W JP2023016740 W JP 2023016740W WO 2023214540 A1 WO2023214540 A1 WO 2023214540A1
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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
- G03F7/027—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds
- G03F7/028—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds with photosensitivity-increasing substances, e.g. photoinitiators
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/22—Secondary treatment of printed circuits
- H05K3/28—Applying non-metallic protective coatings
- H05K3/285—Permanent coating compositions
- H05K3/287—Photosensitive compositions
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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
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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
- G03F7/027—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds
- G03F7/028—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds with photosensitivity-increasing substances, e.g. photoinitiators
- G03F7/031—Organic compounds not covered by group G03F7/029
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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
- G03F7/027—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds
- G03F7/032—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds with binders
- G03F7/033—Non-macromolecular photopolymerisable compounds having carbon-to-carbon double bonds, e.g. ethylenic compounds with binders the binders being polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds, e.g. vinyl polymers
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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
- G03F7/038—Macromolecular compounds which are rendered insoluble or differentially wettable
- G03F7/0388—Macromolecular compounds which are rendered insoluble or differentially wettable with ethylenic or acetylenic bands in the side chains of the photopolymer
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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
- G03F7/075—Silicon-containing compounds
- G03F7/0751—Silicon-containing compounds used as adhesion-promoting additives or as means to improve adhesion
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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
- G03F7/09—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers
- G03F7/105—Photosensitive materials characterised by structural details, e.g. supports, auxiliary layers having substances, e.g. indicators, for forming visible images
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/26—Processing photosensitive materials; Apparatus therefor
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/22—Secondary treatment of printed circuits
- H05K3/28—Applying non-metallic protective coatings
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/01—Dielectrics
- H05K2201/0104—Properties and characteristics in general
- H05K2201/0133—Elastomeric or compliant polymer
Definitions
- the present disclosure relates to a photosensitive resin composition, a photosensitive element, a printed wiring board, and a method for manufacturing a printed wiring board.
- Permanent resists are formed on printed wiring boards. Permanent resists have the role of preventing corrosion of conductor layers and maintaining electrical insulation between conductor layers when printed wiring boards are used. In recent years, permanent resists have been used to prevent solder from adhering to unnecessary parts of the conductor layer of a printed wiring board, even during processes such as flip-chip mounting and wire bonding mounting of semiconductor elements on a printed wiring board via solder. , also has a role as a solder resist film.
- thermosetting resin composition a thermosetting resin composition
- photographic method using a photosensitive resin composition a photographic method using a photosensitive resin composition.
- FC Flexible wiring boards using mounting methods such as FC (Flip Chip), TAB (Tape Automated Bonding), and COF (Chip On Film), IC chips, electronic components, or LCD (liquid crystal display) panels and connection wiring patterns are used.
- a permanent resist is formed by screen printing a thermosetting resin paste and thermally curing except for the portions (see, for example, Patent Document 1).
- the present disclosure relates to a photosensitive resin composition capable of forming a permanent resist having excellent resolution and pattern forming properties, and excellent heat resistance and thermal shock resistance, a photosensitive element using the photosensitive resin composition, and a print.
- the present invention aims to provide a wiring board and a method for manufacturing a printed wiring board.
- thermosetting resin includes a bisphenol-type epoxy compound having an average molecular weight of 360 or less
- elastomer includes an acrylic elastomer
- Another aspect of the present disclosure relates to a photosensitive element comprising a support film and a photosensitive layer formed on the support film, the photosensitive layer containing the above-described photosensitive resin composition.
- Another aspect of the present disclosure relates to a printed wiring board that includes a permanent resist containing a cured product of the above-described photosensitive resin composition.
- Another aspect of the present disclosure includes a step of forming a photosensitive layer on a substrate using the above-described photosensitive resin composition or photosensitive element, and a step of exposing and developing the photosensitive layer to form a resist pattern. and curing a resist pattern to form a permanent resist.
- a photosensitive resin composition capable of forming a permanent resist having excellent resolution and pattern forming properties and excellent heat resistance and thermal shock resistance, and a photosensitive element using the photosensitive resin composition.
- a printed wiring board and a method for manufacturing a printed wiring board.
- FIG. 1 is a cross-sectional view schematically showing a photosensitive element according to the present embodiment.
- thermosetting resin a photopolymerization initiator, (D) photopolymerizable compound, and (E) elastomer, and contains the thermosetting resin
- the resin includes a bisphenol-type epoxy compound having an average molecular weight of 360 or less, and the elastomer includes an acrylic elastomer.
- a photosensitive material comprising a support film and a photosensitive layer formed on the support film, wherein the photosensitive layer contains the photosensitive resin composition according to any one of [1] to [7] above. element.
- a printed wiring board comprising a permanent resist containing a cured product of the photosensitive resin composition according to any one of [1] to [7] above.
- the term “step” includes not only independent steps but also steps that cannot be clearly distinguished from other steps as long as the intended effect of the step is achieved.
- the term “layer” includes a structure having a shape formed on the entire surface as well as a structure having a shape formed in a part of the layer.
- a numerical range indicated using “ ⁇ ” indicates a range that includes the numerical values written before and after " ⁇ " as the minimum and maximum values, respectively.
- the upper limit or lower limit of the numerical range of one step may be replaced with the upper limit or lower limit of the numerical range of another step.
- the upper limit or lower limit of the numerical range may be replaced with the value shown in the Examples.
- (meth)acrylate means at least one of “acrylate” and the corresponding “methacrylate”, and the same applies to other similar expressions such as (meth)acrylic acid and (meth)acryloyl. It is.
- solid content refers to non-volatile content excluding volatile substances (water, solvent, etc.) contained in the photosensitive resin composition, and is liquid, starch syrup-like, or Also contains waxy components.
- the photosensitive resin composition according to the present embodiment includes (A) an acid-modified vinyl group-containing resin, (B) a thermosetting resin, (C) a photopolymerization initiator, (D) a photopolymerizable compound, and (E) Contains elastomer as an essential component.
- the photosensitive resin composition according to this embodiment is a negative photosensitive resin composition, and a cured film of the photosensitive resin composition can be suitably used as a permanent resist.
- Each component used in the photosensitive resin composition of this embodiment will be explained in more detail below.
- the photosensitive resin composition according to this embodiment contains an acid-modified vinyl group-containing resin as component (A).
- the acid-modified vinyl group-containing resin is not particularly limited as long as it has a photopolymerizable ethylenically unsaturated vinyl bond and an alkali-soluble acidic group.
- Examples of the group having an ethylenically unsaturated bond in component (A) include a vinyl group, an allyl group, a propargyl group, a butenyl group, an ethynyl group, a phenylethynyl group, a maleimide group, a nadimide group, and a (meth)acryloyl group. can be mentioned. Among these, a (meth)acryloyl group is preferred from the viewpoint of reactivity and resolution.
- Examples of the acidic group contained in component (A) include a carboxy group, a sulfo group, and a phenolic hydroxyl group. Among these, a carboxy group is preferred from the viewpoint of resolution.
- Component (A) consists of (a) an epoxy resin (hereinafter sometimes referred to as “component (a)”) and (b) an organic acid containing an ethylenically unsaturated group (hereinafter referred to as “component (b)”). ) and (c) a saturated or unsaturated group-containing polybasic acid anhydride (hereinafter sometimes referred to as “component (c)”). ) is preferably an acid-modified vinyl group-containing epoxy derivative.
- acid-modified vinyl group-containing epoxy derivatives examples include acid-modified epoxy (meth)acrylates.
- Acid-modified epoxy (meth)acrylate is a resin obtained by acid-modifying epoxy (meth)acrylate, which is a reaction product of components (a) and (b), with component (c).
- As the acid-modified epoxy (meth)acrylate for example, an addition reaction product obtained by adding a saturated or unsaturated polybasic acid anhydride to an esterified product obtained by reacting an epoxy resin and a vinyl group-containing monocarboxylic acid can be used. can.
- an acid-modified vinyl group-containing resin (hereinafter sometimes referred to as "epoxy resin (a1)") using a bisphenol novolac type epoxy resin (a1) (hereinafter sometimes referred to as “epoxy resin (a1)”) as the component (a).
- A1) hereinafter sometimes referred to as “component (A1)”
- epoxy resin (a2) other than epoxy resin (a1) as component (a)
- Examples include acid-modified vinyl group-containing resin (A2) (hereinafter sometimes referred to as "(A2) component").
- Examples of the epoxy resin (a1) include epoxy resins having a structural unit represented by the following formula (I) or (II).
- R 11 represents a hydrogen atom or a methyl group, and a plurality of R 11s may be the same or different.
- Y 1 and Y 2 each independently represent a hydrogen atom or a glycidyl group, and at least one of Y 1 and Y 2 is a glycidyl group.
- R 11 is preferably a hydrogen atom, and from the viewpoint of further improving thermal shock resistance, Y 1 and Y 2 is preferably a glycidyl group.
- the number of structural units represented by formula (I) in the epoxy resin (a1) is 1 or more, and may be 10 to 100, 12 to 80, or 15 to 70.
- the number of structural units is within the above range, the linearity of the resist pattern outline, adhesion to the copper substrate, heat resistance, and electrical insulation can be easily improved.
- the number of structural units indicates an integer value in a single molecule, and indicates a rational number, which is an average value, in an aggregate of multiple types of molecules. The same applies to the number of structural units below.
- R 12 represents a hydrogen atom or a methyl group, and multiple R 12s may be the same or different.
- Y 3 and Y 4 each independently represent a hydrogen atom or a glycidyl group, and at least one of Y 3 and Y 4 is a glycidyl group.
- R 12 is preferably a hydrogen atom, and from the viewpoint of further improving thermal shock resistance, Y 3 and Y 4 is preferably a glycidyl group.
- the number of structural units represented by formula (II) in the epoxy resin (a1) is 1 or more, and may be 10 to 100, 12 to 80, or 15 to 70. When the number of structural units is within the above range, the linearity of the resist pattern outline, the adhesion to the copper substrate, and the heat resistance can be easily improved.
- the epoxy resin in which R 12 is a hydrogen atom and Y 3 and Y 4 are glycidyl groups is referred to as EXA-7376 series (manufactured by DIC Corporation, trade name), and in which R 12 is a methyl group.
- the epoxy resin in which Y 3 and Y 4 are glycidyl groups is commercially available as EPON SU8 series (manufactured by Mitsubishi Chemical Corporation, trade name).
- the epoxy resin (a2) is not particularly limited as long as it is an epoxy resin different from the epoxy resin (a1), but it suppresses the occurrence of undercuts, improves the linearity of the resist pattern outline, the adhesion to the copper substrate, and the resolution. From the viewpoint of improving properties, it is preferably at least one selected from the group consisting of novolac type epoxy resin, bisphenol A type epoxy resin, bisphenol F type epoxy resin, triphenolmethane type epoxy resin, and biphenyl type epoxy resin. .
- Examples of novolak-type epoxy resins include epoxy resins having a structural unit represented by the following formula (III).
- Examples of the bisphenol A epoxy resin or the bisphenol F epoxy resin include an epoxy resin having a structural unit represented by the following formula (IV).
- Examples of triphenolmethane type epoxy resins include epoxy resins having a structural unit represented by the following formula (V).
- Examples of biphenyl-type epoxy resins include epoxy resins having a structural unit represented by the following formula (VI).
- a novolac type epoxy resin having a structural unit represented by the following formula (III) is preferable.
- novolak-type epoxy resins having such structural units include novolak-type epoxy resins represented by the following formula (III').
- R 13 represents a hydrogen atom or a methyl group
- Y 5 represents a hydrogen atom or a glycidyl group
- at least one of Y 5 is a glycidyl group.
- n 1 is a number of 1 or more, and a plurality of R 13 and Y 5 may be the same or different. From the viewpoint of suppressing the occurrence of undercuts and improving the linearity and resolution of the resist pattern outline, R 13 is preferably a hydrogen atom.
- the molar ratio of Y5 which is a hydrogen atom, and Y5 , which is a glycidyl group, suppresses the occurrence of undercuts and improves the linearity and resolution of the resist pattern contour, It may be 0/100 to 30/70 or 0/100 to 10/90.
- n 1 is 1 or more, but may be 10-200, 20-150, or 30-100. When n1 is within the above range, the linearity of the resist pattern outline, the adhesion to the copper substrate, and the heat resistance are likely to be improved.
- novolak epoxy resin represented by formula (III') examples include phenol novolak epoxy resins and cresol novolak epoxy resins. These novolak-type epoxy resins can be obtained, for example, by reacting a phenol novolac resin or a cresol novolak resin with epichlorohydrin by a known method.
- Examples of the phenol novolac type epoxy resin or cresol novolac type epoxy resin represented by formula (III') include YDCN-701, YDCN-702, YDCN-703, YDCN-704, YDCN-704L, YDPN-638, YDPN.
- epoxy resin (a2) bisphenol A epoxy resin or bisphenol F epoxy resin having a structural unit represented by the following formula (IV) is preferably mentioned.
- epoxy resins having such structural units include bisphenol A epoxy resins and bisphenol F epoxy resins represented by the following formula (IV').
- R 14 represents a hydrogen atom or a methyl group, multiple R 14s may be the same or different, and Y 6 represents a hydrogen atom or a glycidyl group.
- n 2 represents a number of 1 or more, and when n 2 is 2 or more, a plurality of Y 6 may be the same or different, and at least one Y 6 is a glycidyl group.
- R 14 is preferably a hydrogen atom, and from the viewpoint of further improving thermal shock resistance, Y 6 is a glycidyl group. It is preferable that n 2 represents 1 or more, but may be 10-100, 12-80, or 15-60. When n2 is within the above range, the linearity of the resist pattern outline, the adhesion to the copper substrate, and the heat resistance are likely to be improved.
- Bisphenol A epoxy resin or bisphenol F epoxy resin in which Y 6 in formula (IV) is a glycidyl group is, for example, bisphenol A epoxy resin or bisphenol F epoxy resin in which Y 6 in formula (IV) is a hydrogen atom. It can be obtained by reacting the hydroxyl group (-OY 6 ) of an epoxy resin with epichlorohydrin.
- reaction temperature is within the above range, the reaction does not become too slow and side reactions can be suppressed.
- Examples of the bisphenol A epoxy resin or bisphenol F epoxy resin represented by formula (IV') include jER807, jER815, jER825, jER827, jER828, jER834, jER1001, jER1004, jER1007 and jER1.
- 009 hereinafter referred to as Mitsubishi Chemical Stock
- DER-330, DER-301, DER-361 manufactured by Dow Chemical Company, product name
- YD-8125, YDF-170, YDF-175S, YDF-2001, YDF-2004 , YDF-8170 (trade name, manufactured by Nippon Steel Chemical & Materials Co., Ltd.), etc. are commercially available.
- a triphenolmethane type epoxy resin having a structural unit represented by the following formula (V) is preferably mentioned.
- the triphenolmethane type epoxy resin having such a structural unit include a triphenolmethane type epoxy resin represented by the following formula (V').
- Y 7 represents a hydrogen atom or a glycidyl group, a plurality of Y 7s may be the same or different, and at least one Y 7 is a glycidyl group.
- n3 represents a number of 1 or more.
- the molar ratio of Y 7 which is a hydrogen atom and Y 7 which is a glycidyl group in Y 7 is as follows. It may be 0/100 to 30/70. As can be seen from this molar ratio, at least one of Y7 is a glycidyl group.
- n 3 is 1 or more, but may be 10-100, 12-80, or 15-70. When n3 is within the above range, the linearity of the resist pattern outline, the adhesion to the copper substrate, and the heat resistance are likely to be improved.
- triphenolmethane type epoxy resin represented by formula (V') for example, FAE-2500, EPPN-501H, EPPN-502H (trade names, manufactured by Nippon Kayaku Co., Ltd.), etc. are commercially available. It is possible.
- biphenyl type epoxy resin having a structural unit represented by the following formula (VI) is preferably mentioned.
- biphenyl-type epoxy resins having such structural units include biphenyl-type epoxy resins represented by the following formula (VI').
- Y 8 represents a hydrogen atom or a glycidyl group, a plurality of Y 8 may be the same or different, and at least one Y 8 is a glycidyl group.
- n 4 represents a number of 1 or more.
- Examples of the biphenyl-type epoxy resin represented by formula (VI') include NC-3000, NC-3000-L, NC-3000-H, NC-3000-FH-75M, NC-3100, and CER-3000- L (trade name, manufactured by Nippon Kayaku Co., Ltd.) and the like are commercially available.
- epoxy resin (a2) a novolac type epoxy resin having a structural unit represented by formula (III), a bisphenol A type epoxy resin having a structural unit represented by formula (IV), and a bisphenol A type epoxy resin having a structural unit represented by formula (IV) are used. At least one type selected from the group consisting of bisphenol F-type epoxy resins having a structural unit represented by formula (IV) is preferable, and a bisphenol F-type epoxy resin having a structural unit represented by formula (IV) is more preferable.
- a component (A2) using a bisphenol A epoxy resin or a bisphenol F epoxy resin having a structural unit represented by formula (IV) may be used in combination.
- Component (b) includes, for example, acrylic acid, acrylic acid dimer, methacrylic acid, ⁇ -furfurylacrylic acid, ⁇ -styrylacrylic acid, cinnamic acid, crotonic acid, ⁇ -cyanocinnamic acid, etc. Derivatives; half-ester compounds that are reaction products of hydroxyl group-containing (meth)acrylates and dibasic acid anhydrides; and reaction products of vinyl group-containing monoglycidyl ethers or vinyl group-containing monoglycidyl esters and dibasic acid anhydrides. Examples include half ester compounds. Component (b) may be used alone or in combination of two or more.
- the half-ester compound can be obtained, for example, by reacting a hydroxyl group-containing (meth)acrylate, a vinyl group-containing monoglycidyl ether, or a vinyl group-containing monoglycidyl ester with a dibasic acid anhydride.
- hydroxyl group-containing (meth)acrylates examples include hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, hydroxybutyl (meth)acrylate, polyethylene glycol mono (meth)acrylate, trimethylolpropane di(meth)acrylate, pentaerythritol tri(meth)acrylate, dipentaerythritol penta(meth)acrylate, and glycidyl(meth)acrylate.
- dibasic acid anhydrides examples include succinic anhydride, maleic anhydride, tetrahydrophthalic anhydride, phthalic anhydride, methyltetrahydrophthalic anhydride, ethyltetrahydrophthalic anhydride, hexahydrophthalic anhydride, and methylhexahydrophthalic anhydride. , ethylhexahydrophthalic anhydride, and itaconic anhydride.
- component (a) and component (b) it is preferable to react at a ratio of 0.6 to 1.05 equivalents of component (b) to 1 equivalent of the epoxy group of component (a). , it is more preferable to react at a ratio of 0.8 to 1.0 equivalents. By reacting at such a ratio, the photosensitivity increases and the linearity of the resist pattern outline tends to be excellent.
- Component (a) and component (b) can be dissolved in an organic solvent and reacted.
- organic solvents include ketones such as methyl ethyl ketone and cyclohexanone; aromatic hydrocarbons such as toluene, xylene, and tetramethylbenzene; methyl cellosolve, butyl cellosolve, methyl carbitol, butyl carbitol, propylene glycol monomethyl ether, and dipropylene glycol.
- Glycol ethers such as monoethyl ether, dipropylene glycol diethyl ether, and triethylene glycol monoethyl ether; Esters such as ethyl acetate, butyl acetate, butyl cellosolve acetate, and carbitol acetate; Aliphatic hydrocarbons such as octane and decane; Petroleum Examples include petroleum solvents such as ether, petroleum naphtha, hydrogenated petroleum naphtha, and solvent naphtha. The organic solvents may be used alone or in combination of two or more.
- a catalyst may be used to promote the reaction between component (a) and component (b).
- the catalyst include triethylamine, benzylmethylamine, methyltriethylammonium chloride, benzyltrimethylammonium chloride, benzyltrimethylammonium bromide, benzyltrimethylammonium iodide, and triphenylphosphine.
- One type of catalyst may be used alone or two or more types may be used in combination.
- the amount of the catalyst used is 0.01 to 10 parts by mass, based on a total of 100 parts by mass of components (a) and (b). It may be 0.05 to 2 parts by weight, or 0.1 to 1 part by weight.
- a polymerization inhibitor may be used in the reaction between component (a) and component (b) in order to prevent polymerization during the reaction.
- the polymerization inhibitor include hydroquinone, methylhydroquinone, hydroquinone monomethyl ether, catechol, and pyrogallol.
- the polymerization inhibitors may be used alone or in combination of two or more.
- the amount of polymerization inhibitor used is 0.01 to 1 part by mass, 0.02 to 0.8 parts by mass, based on a total of 100 parts by mass of components (a) and (b). part, or 0.04 to 0.5 part by mass.
- the reaction temperature between component (a) and component (b) may be 60 to 150°C, 80 to 120°C, or 90 to 110°C from the viewpoint of productivity.
- Component (A') obtained by reacting component (a) with component (b) has a hydroxyl group formed by a ring-opening addition reaction between the epoxy group of component (a) and the carboxy group of component (b). are doing.
- component (A') with component (c) By further reacting component (A') with component (c), the hydroxyl group of component (A') (including the hydroxyl group originally present in component (a)) and the acid anhydride group of component (c) An acid-modified vinyl group-containing resin in which is half-esterified with is obtained.
- Component (c) includes, for example, succinic anhydride, maleic anhydride, tetrahydrophthalic anhydride, phthalic anhydride, methyltetrahydrophthalic anhydride, ethyltetrahydrophthalic anhydride, hexahydrophthalic anhydride, methylhexahydrophthalic anhydride, Ethylhexahydrophthalic anhydride and itaconic anhydride are mentioned. Among these, tetrahydrophthalic anhydride is preferred from the viewpoint of resolution. Component (c) may be used alone or in combination of two or more.
- component (A) In the reaction between component (A') and component (c), for example, by reacting 0.1 to 1.0 equivalent of component (c) with respect to 1 equivalent of hydroxyl group in component (A'), The acid value of component (A) can be adjusted.
- the reaction temperature between component (A') and component (c) may be 50 to 150°C, 60 to 120°C, or 70 to 100°C from the viewpoint of productivity.
- a hydrogenated bisphenol A type epoxy resin may be partially used as component (a), and styrene-maleic acid such as hydroxyethyl (meth)acrylate modified product of styrene-maleic anhydride copolymer may be used in combination. Some of the resins may also be used together.
- Component (A) preferably contains component (A1) from the viewpoint of suppressing the occurrence of undercuts and further improving adhesion with the copper substrate, thermal shock resistance, and resolution, and particularly improves adhesion strength. From this viewpoint, it is more preferable that the component (A1) and the component (A2) are included.
- the mass ratio of (A1)/(A2) is not particularly limited, but the linearity of the resist pattern contour and the resistance to electroless plating are And from the viewpoint of improving heat resistance, it may be 20/80 to 90/10, 30/70 to 80/20, 40/60 to 75/25, or 50/50 to 70/30.
- the acid value of component (A) is not particularly limited.
- the acid value of component (A) may be 30 mgKOH/g or more, 40 mgKOH/g or more, or 50 mgKOH/g or more from the viewpoint of improving the solubility of the unexposed area in an alkaline aqueous solution.
- the acid value of component (A) may be 150 mgKOH/g or less, 120 mgKOH/g or less, or 100 mgKOH/g or less from the viewpoint of improving the electrical properties of the cured film.
- the weight average molecular weight (Mw) of component (A) is not particularly limited.
- the Mw of component (A) may be 3000 or more, 4000 or more, or 5000 or more from the viewpoint of improving the adhesiveness of the cured film.
- the Mw of the component (A) may be 30,000 or less, 25,000 or less, or 18,000 or less from the viewpoint of improving the resolution of the photosensitive layer.
- Mw can be measured by gel permeation chromatography (GPC). Mw can be measured, for example, under the following GPC conditions and converted using a standard polystyrene calibration curve. To create a calibration curve, a set of 5 samples (“PStQuick MP-H" and "PStQuick B", manufactured by Tosoh Corporation) can be used as standard polystyrene.
- GPC gel permeation chromatography
- GPC device High-speed GPC device “HCL-8320GPC” (manufactured by Tosoh Corporation) Detector: Differential refractometer or UV detector (manufactured by Tosoh Corporation) Column: Column TSKgel SuperMultipore HZ-H (column length: 15 cm, column inner diameter: 4.6 mm) (manufactured by Tosoh Corporation) Eluent: Tetrahydrofuran (THF) Measurement temperature: 40°C Flow rate: 0.35mL/min Sample concentration: 10mg/THF5mL Injection volume: 20 ⁇ L
- the content of component (A) in the photosensitive resin composition is from 20 to 70% based on the total solid content of the photosensitive resin composition, from the viewpoint of improving the heat resistance, electrical properties, and chemical resistance of the permanent resist. % by weight, 25-60% by weight, or 30-50% by weight.
- thermosetting resin The photosensitive resin composition according to the present embodiment contains a thermosetting resin as the component (B), and the component (B) is a bisphenol-type epoxy compound having an average molecular weight of 360 or less (hereinafter referred to as "component (B1)"). ).
- component (B1) a bisphenol-type epoxy compound having an average molecular weight of 360 or less.
- Component (B1) is an epoxy compound synthesized by a condensation reaction between a bisphenol compound and epichlorohydrin.
- bisphenol compounds include bisphenol A, bisphenol F, and bisphenol S.
- Component (B1) mainly contains diglycidyl ether having a bisphenol skeleton (diglycidyl ether represented by the following formula (1)), in which 2 moles of epichlorohydrin are bonded to 1 mole of the bisphenol compound. do.
- X is a methylene group (CH 2 ), an ethylene group (CH 2 CH 2 ), an ethylidene group (CH(CH 3 )), a 1-methylethylidene group (C(CH 3 ) 2 ), or Indicates a sulfo group. From the viewpoint of improving developability, X is preferably a methylene group or a 1-methylethylidene group.
- a typical bisphenol-type epoxy compound contains a polymer of a bisphenol compound and epichlorohydrin (for example, an oligomer component such as a dimer or trimer).
- component (B1) has a low content of oligomer components.
- the content of diglycidyl ether represented by formula (1) in component (B1) is 94% by mass or more, 96% by mass or more, or 98% by mass or more from the viewpoint of further improving developability and thermal shock resistance. There may be.
- the average molecular weight of component (B1) may be 310 to 360, 315 to 359, 320 to 358, 325 to 357, or 330 to 356 from the viewpoint of further improving heat resistance and thermal shock resistance.
- the average molecular weight can be calculated, for example, by the GPC method (see “Measurement of degree of polymerization of epoxy oligomers by GPC, NMR, etc.”, Central Customs Laboratory Bulletin, No. 21, 1980, pp. 85-90). .
- the epoxy equivalent of component (B1) is 150 to 182 g/eq, 154 to 181 g/eq, 160 to 180 g/eq, 162 to 179 g/eq, or 166 to 178 g from the viewpoint of further improving heat resistance and thermal shock resistance. /eq may be used. Epoxy equivalent can be measured according to JIS K 7236.
- Component (B) may contain thermosetting resins other than component (B1).
- thermosetting resins include epoxy resins that do not have a bisphenol skeleton, phenol resins, unsaturated imide resins, cyanate resins, isocyanate resins, benzoxazine resins, oxetane resins, amino resins, unsaturated polyester resins, and allyl resins. , dicyclopentadiene resin, silicone resin, triazine resin, and melamine resin.
- epoxy resins without a bisphenol skeleton are preferred from the viewpoint of further improving the heat resistance of the cured film.
- epoxy resins without a bisphenol skeleton examples include novolak epoxy resins, dicyclopentadiene epoxy resins, hydrogenated bisphenol A epoxy resins, biphenyl epoxy resins, hydantoin epoxy resins, triglycidyl isocyanurate, and bixylenol.
- examples include molded epoxy resins.
- the content of component (B1) in component (B) may be 30% by mass or more, 50% by mass or more, or 60% by mass or more, based on the total amount of component (B). When this content is 30% by mass or more, better thermal shock resistance tends to be obtained.
- the content of component (B) in the photosensitive resin composition is 2 to 30% by mass, 5 to 25% by mass, 8 to 20% by mass, or 10 to 20% by mass, based on the total solid content of the photosensitive resin composition. It may be 18% by mass. When the content of component (B) is within the above range, the adhesiveness and heat resistance of the cured film to be formed can be further improved while maintaining good developability.
- ((C) component photopolymerization initiator
- the photopolymerization initiator as component (C) is not particularly limited as long as it can polymerize component (A) and component (D).
- Component (C) may be used alone or in combination of two or more.
- Component (C) includes, for example, benzoin compounds such as benzoin, benzoin methyl ether, and benzoin isopropyl ether; acetophenone, 2,2-dimethoxy-2-phenylacetophenone, 2,2-diethoxy-2-phenylacetophenone, 1,1 -dichloroacetophenone, 1-hydroxycyclohexylphenylketone, 2-benzyl-2-dimethylamino-1-(4-morpholinophenyl)-butanone-1,2-methyl-[4-(methylthio)phenyl]-2-morpholino- Acetophenone compounds such as 1-propane and N,N-dimethylaminoacetophenone; anthraquinones such as 2-methylanthraquinone, 2-ethylanthraquinone, 2-tert-butylanthraquinone, 1-chloroanthraquinone, 2-amylanthraquinone, and 2-aminoanth
- Acridine compounds such as 2,4,6-trimethylbenzoyldiphenylphosphine oxide; 1,2-octanedione-1-[4-(phenylthio)phenyl]-2-(O-benzoyloxime), 1- [9-ethyl-6-(2-methylbenzoyl)-9H-carbazol-3-yl]ethanone 1-(O-acetyloxime), 1-phenyl-1,2-propanedione-2-[O-(ethoxy oxime ester compounds such as N,N-dimethylaminobenzoic acid ethyl ester, N,N-dimethylaminobenzoic acid isoamyl ester, pentyl-4-dimethylaminobenzoate, triethylamine, triethanolamine, etc.
- Examples include amine compounds.
- the content of component (C) in the photosensitive resin composition is not particularly limited, but is 0.2 to 15% by mass, 0.4 to 5% by mass, based on the total solid content of the photosensitive resin composition. Or it may be 0.6 to 1.5% by mass.
- the photosensitive resin composition according to the present embodiment contains a photopolymerizable compound as the component (D) from the viewpoint of increasing the chemical resistance of the exposed area and increasing the difference in developer resistance between the exposed area and the unexposed area.
- Component (D) is not particularly limited as long as it is a photopolymerizable compound having a photopolymerizable functional group and no acidic group.
- photopolymerizable functional groups include those having an ethylenically unsaturated bond such as a vinyl group, an allyl group, a propargyl group, a butenyl group, an ethynyl group, a phenylethynyl group, a maleimide group, a nadimide group, and a (meth)acryloyl group.
- ethylenically unsaturated bond such as a vinyl group, an allyl group, a propargyl group, a butenyl group, an ethynyl group, a phenylethynyl group, a maleimide group, a nadimide group, and a (meth)acryloyl group.
- examples include groups.
- Component (D) includes, for example, a photopolymerizable compound having one ethylenically unsaturated bond, a photopolymerizable compound having two ethylenically unsaturated bonds, and a photopolymerizable compound having three or more ethylenically unsaturated bonds. Examples include sexual compounds.
- Examples of the photopolymerizable compound having one ethylenically unsaturated bond include (meth)acrylic acid and (meth)acrylic acid alkyl ester.
- Examples of the (meth)acrylic acid alkyl ester include (meth)acrylic acid methyl ester, (meth)acrylic acid ethyl ester, (meth)acrylic acid butyl ester, (meth)acrylic acid 2-ethylhexyl ester, and (meth)acrylic acid 2-ethylhexyl ester.
- Acrylic acid hydroxyethyl ester is mentioned.
- photopolymerizable compounds having two ethylenically unsaturated bond groups include polyethylene glycol di(meth)acrylate, trimethylolpropane di(meth)acrylate, polypropylene glycol di(meth)acrylate, and 2,2-bis( 4-(meth)acryloxypolyethoxypolypropoxyphenyl)propane, and bisphenol A diglycidyl ether di(meth)acrylate.
- photopolymerizable compounds having three or more ethylenically unsaturated bonds include (meth)acrylate compounds having a skeleton derived from trimethylolpropane such as trimethylolpropane tri(meth)acrylate; tetramethylolmethane tri(meth) (Meth)acrylate compounds having a skeleton derived from tetramethylolmethane such as acrylate and tetramethylolmethanetetra(meth)acrylate; having a skeleton derived from pentaerythritol such as pentaerythritol tri(meth)acrylate and pentaerythritol tetra(meth)acrylate (meth)acrylate compounds; (meth)acrylate compounds having a skeleton derived from dipentaerythritol, such as dipentaerythritol penta(meth)acrylate and dipentaerythritol hex
- (meth)acrylate compounds having a skeleton derived from dipentaerythritol are preferred from the viewpoint of increasing the chemical resistance of the exposed area and increasing the difference in developer resistance between the exposed area and the unexposed area. More preferred are pentaerythritol penta(meth)acrylate and dipentaerythritol hexa(meth)acrylate.
- the content of component (D) may be 1 to 20% by mass, 2 to 15% by mass, or 3 to 10% by mass based on the total solid content of the photosensitive resin composition.
- the photosensitive resin composition according to the present embodiment has reduced flexibility and adhesive strength due to distortion (internal stress) inside the resin due to curing shrinkage of the (A) component. The decline can be suppressed.
- component (E) can improve the heat resistance and impact resistance of the cured film formed from the photosensitive resin composition.
- Acrylic elastomers can be synthesized by polymerizing (meth)acrylic compounds.
- the (meth)acrylic compound include (meth)acrylic acid, (meth)acrylic acid ester, and acrylonitrile.
- Examples of (meth)acrylic esters include methyl (meth)acrylate, (meth)acrylic acid, n-butyl (meth)acrylate, isobutyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, Examples include 2-methoxyethyl (meth)acrylate and 2-ethoxyethyl (meth)acrylate.
- the acrylic elastomer preferably has a carboxy group from the viewpoint of further improving developability.
- Carboxy groups can be introduced by polymerizing (meth)acrylic acid.
- the content of structural units based on (meth)acrylic acid in the acrylic resin may be 2 to 50% by mass, 5 to 30% by mass, 8 to 25% by mass, or 10 to 20% by mass. When the content of the structural unit based on (meth)acrylic acid is within the above range, developability and resolution tend to be improved.
- the acrylic elastomer preferably has an n-butyl group from the viewpoint of further improving impact resistance.
- the n-butyl group can be introduced by polymerizing n-butyl (meth)acrylate.
- the content of the structural unit based on n-butyl (meth)acrylate in the acrylic elastomer may be 30 to 90% by mass, 40 to 85% by mass, 45 to 80% by mass, or 50 to 75% by mass.
- resolution and impact resistance tend to be improved.
- the weight average molecular weight (Mw) of the acrylic elastomer may be 1000 to 50000, 2000 to 40000, 3000 to 30000, 5000 to 20000, or 8000 to 18000.
- Mw weight average molecular weight
- the Mw of the acrylic elastomer can be measured by the GPC method described above.
- Component (E) may further contain an elastomer other than the acrylic elastomer.
- elastomer other than acrylic elastomer include styrene elastomer, olefin elastomer, urethane elastomer, polyester elastomer, polyamide elastomer, and silicone elastomer.
- styrenic elastomer examples include styrene-butadiene-styrene block copolymer, styrene-isoprene-styrene block copolymer, styrene-ethylene-butylene-styrene block copolymer, and styrene-ethylene-propylene-styrene block copolymer.
- styrene derivatives such as ⁇ -methylstyrene, 3-methylstyrene, 4-propylstyrene, and 4-cyclohexylstyrene can be used as components constituting the styrene-based elastomer.
- olefin elastomers examples include ethylene-propylene copolymer, ethylene- ⁇ -olefin copolymer, ethylene- ⁇ -olefin-nonconjugated diene copolymer, propylene- ⁇ -olefin copolymer, and butene- ⁇ - Copolymerization of non-conjugated dienes such as olefin copolymers, ethylene-propylene-diene copolymers, dicyclopentadiene, 1,4-hexadiene, cyclooctadiene, methylene norbornene, ethylidene norbornene, butadiene, isoprene, etc., and ⁇ -olefins. epoxy-modified polybutadiene, and carboxylic acid-modified butadiene-acrylonitrile copolymer.
- the epoxy-modified polybutadiene preferably has a hydroxyl group at the end of the molecule, more preferably has a hydroxyl group at both ends of the molecule, and even more preferably has a hydroxyl group only at both ends of the molecule.
- the number of hydroxyl groups that the epoxy-modified polybutadiene has may be 1 or more, preferably 1 to 5, more preferably 1 or 2, and even more preferably 2.
- the urethane-based elastomer it is possible to use a compound composed of a hard segment consisting of a low molecular weight (short chain) diol and a diisocyanate, and a soft segment consisting of a high molecular weight (long chain) diol and diisocyanate.
- short chain diols examples include ethylene glycol, propylene glycol, 1,4-butanediol, and bisphenol A.
- the number average molecular weight of the short chain diol is preferably 48 to 500.
- long-chain diols examples include polypropylene glycol, polytetramethylene oxide, poly(1,4-butylene adipate), poly(ethylene-1,4-butylene adipate), polycaprolactone, and poly(1,6-hexylene carbonate). ), and poly(1,6-hexylene-neopentylene adipate).
- the number average molecular weight of the long chain diol is preferably 500 to 10,000.
- polyester elastomer a compound obtained by polycondensing a dicarboxylic acid or its derivative with a diol compound or its derivative can be used.
- dicarboxylic acids examples include aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, and naphthalenedicarboxylic acid; aliphatic dicarboxylic acids having 2 to 20 carbon atoms such as adipic acid, sebacic acid, and dodecanedicarboxylic acid; and cyclohexanedicarboxylic acid. Examples include alicyclic dicarboxylic acids. One type of dicarboxylic acid can be used alone or two or more types can be used in combination.
- diol compounds include aliphatic diols such as ethylene glycol, 1,3-propanediol, 1,4-butanediol, 1,6-hexanediol, and 1,10-decanediol; 1,4-cyclohexanediol, etc. and aromatic diols such as bisphenol A, bis-(4-hydroxyphenyl)methane, bis-(4-hydroxy-3-methylphenyl)propane, and resorcinol.
- aromatic diols such as bisphenol A, bis-(4-hydroxyphenyl)methane, bis-(4-hydroxy-3-methylphenyl)propane, and resorcinol.
- polyester elastomer a multi-block copolymer in which an aromatic polyester (for example, polybutylene terephthalate) is used as a hard segment component and an aliphatic polyester (for example, polytetramethylene glycol) is used as a soft segment component can be used.
- aromatic polyester for example, polybutylene terephthalate
- aliphatic polyester for example, polytetramethylene glycol
- polyester elastomers There are various grades of polyester elastomers depending on the type, ratio, and molecular weight of hard and soft segments.
- Polyamide-based elastomers are roughly divided into two types: polyether block amide type and polyether ester block amide type, which use polyamide for the hard segment and polyether or polyester for the soft segment.
- polyamides include polyamide-6, polyamide-11, and polyamide-12.
- polyethers include polyoxyethylene glycol, polyoxypropylene glycol, and polytetramethylene glycol.
- a silicone elastomer is a compound whose main component is organopolysiloxane.
- organopolysiloxane examples include polydimethylsiloxane, polymethylphenylsiloxane, and polydiphenylsiloxane.
- the silicone elastomer may be a compound obtained by partially modifying an organopolysiloxane with a vinyl group, an alkoxy group, or the like.
- the content of component (E) is 1 to 40 parts by weight, 2 to 35 parts by weight, 3 to 30 parts by weight, or 4 to 15 parts by weight per 100 parts by weight of component (A). It's okay.
- the content of component (E) may be 5 parts by mass or more, 8 parts by mass or more, or 10 parts by mass or more, and 40 parts by mass or less, based on 100 parts by mass of component (A). It may be 35 parts by mass or less, 30 parts by mass or less, or 25 parts by mass or less.
- the content of component (E) is within the above range, the cured film has a low elastic modulus in a high temperature region, and unexposed areas are more likely to be eluted with a developer.
- the photosensitive resin composition according to this embodiment may further contain an inorganic filler as component (F).
- component (F) By containing component (F), the adhesive strength and hardness of the permanent resist can be improved.
- Component (F) may be used alone or in combination of two or more.
- inorganic fillers include silica, alumina, titania, tantalum oxide, zirconia, silicon nitride, barium titanate, barium carbonate, magnesium carbonate, aluminum hydroxide, magnesium hydroxide, lead titanate, lead zirconate titanate, and titanium.
- Component (F) may contain silica from the viewpoint of improving the heat resistance of the permanent resist, and may contain barium sulfate from the viewpoint of improving the heat resistance and adhesive strength of the permanent resist, and may contain silica and barium sulfate. May include. From the viewpoint of improving the dispersibility of the inorganic filler, an inorganic filler whose surface has been previously treated with alumina or an organic silane compound may be used.
- the average particle size of the inorganic filler is 0.01 to 5.0 ⁇ m, 0.05 to 3.0 ⁇ m, 0.1 to 2.0 ⁇ m, or 0.15 to 1.0 ⁇ m. Good too.
- the average particle size of component (F) is the average particle size of the inorganic filler in a state dispersed in the photosensitive resin composition, and is a value obtained by measuring as follows. First, after diluting the photosensitive resin composition 1000 times with methyl ethyl ketone, using a submicron particle analyzer (manufactured by Beckman Coulter Co., Ltd., product name: N5), a refractive index of 1 is measured in accordance with the international standard ISO13321. At .38, the particles dispersed in the solvent are measured, and the particle diameter at an integrated value of 50% (volume basis) in the particle size distribution is defined as the average particle diameter.
- the content of component (F) may be 10 to 70% by mass, 15 to 60% by mass, or 20 to 50% by mass based on the total solid content of the photosensitive resin composition.
- the content of component (E) is within the above range, the low coefficient of thermal expansion, heat resistance, and film strength can be further improved.
- the content of silica is 5 to 60% by mass, 10 to 40% by mass, or 15 to 30% by mass, based on the total solid content of the photosensitive resin composition. Good too.
- the content of barium sulfate is 5 to 30% by mass, 8 to 25% by mass, or 10 to 20% by mass based on the total solid content of the photosensitive resin composition. It's good.
- the content of silica and barium sulfate is within the above range, low thermal expansion coefficient, soldering heat resistance, and adhesive strength tend to be excellent.
- the photosensitive resin composition according to the present embodiment may further contain a pigment as the component (G) from the viewpoint of improving the identifiability or appearance of the manufacturing device.
- a coloring agent that develops a desired color when hiding wiring (conductor pattern), etc. can be used as component (G).
- Component (G) may be used alone or in combination of two or more.
- component (G) examples include phthalocyanine blue, phthalocyanine green, iodine green, diazo yellow, crystal violet, titanium oxide, carbon black, and naphthalene black.
- the content of component (G) is 0.01 to 5.0% by mass, based on the total solid content in the photosensitive resin composition, from the viewpoint of making it easier to identify the manufacturing equipment and concealing the wiring. It may be .03 to 3.0% by weight, or 0.05 to 2.0% by weight.
- the photosensitive resin composition according to the present embodiment may further contain an ion scavenger as the component (H) from the viewpoint of improving resist shape, adhesion, fluidity, and reliability.
- the component (H) is not particularly limited as long as it can trap ions in the ion trapping agent and has the function of trapping at least one of cations and anions.
- the ions to be captured in this embodiment include, for example, sodium ions (Na + ), chloride ions (Cl - ), and bromine ions, which are incorporated into a composition that reacts with irradiation with light, electron beams, etc. and changes its solubility in solvents.
- These ions include ions (Br ⁇ ), copper ions (Cu + , Cu 2+ ), and the like. By capturing these ions, electrical insulation properties, electrolytic corrosion resistance, etc. are improved.
- the component (H) is preferably an ion scavenger containing at least one selected from the group consisting of Zr (zirconium), Bi (bismuth), Mg (magnesium), and Al (aluminum). Component (H) may be used alone or in combination of two or more.
- component (H) examples include cation trapping agents that trap cations, anion trapping agents that trap anions, and amphoteric trapping agents that trap cations and anions.
- Examples of the cation scavenger include zirconium phosphate, zirconium tungstate, zirconium molybdate, zirconium tungstate, zirconium antimonate, zirconium selenate, zirconium tellurate, zirconium silicate, zirconium phosphosilicate, and zirconium polyphosphate. Mention may be made of inorganic ion exchangers of metal oxides.
- anion scavenger examples include inorganic ion exchangers such as bismuth oxide hydrate and hydrotalcites.
- amphoteric ion scavenger examples include inorganic ion exchangers of metal hydrated oxides such as aluminum oxide hydrate and zirconium oxide hydrate.
- inorganic ion exchangers of metal hydrated oxides such as aluminum oxide hydrate and zirconium oxide hydrate.
- IXE-1320 Mg, Al-containing compound
- IXE-600 Bi-containing compound
- IXE-633 Bi-containing compound
- IXE-680 Bi-containing compound
- IXE-6107 Zr, Bi-containing compound
- IXE-6136 Zr, Bi-containing compound
- IXEPLAS-A1 Zr, Mg, Al-containing compound
- IXEPLAS-A2 Zr, Mg, Al-containing compound
- IXEPLAS- B1 Zr, Bi-containing compound etc.
- Component (H) may be in the form of particles, and from the viewpoint of improving insulation, the average particle size of component (H) may be 5 ⁇ m or less, 3 ⁇ m or less, or 2 ⁇ m or less, and may be 0.5 ⁇ m or less, 3 ⁇ m or less, or 2 ⁇ m or less. It may be 1 ⁇ m or more.
- the average particle size of component (H) is the particle size of particles dispersed in the photosensitive resin composition, and can be measured by the same method as the method for measuring the average particle size of component (F).
- the photosensitive resin composition contains component (H), its content is not particularly limited, but from the viewpoint of improving electrical insulation and electrolytic corrosion resistance, based on the total solid content of the photosensitive resin composition, It may be 0.05-10% by weight, 0.1-5% by weight, or 0.2-1% by weight.
- the photosensitive resin composition according to this embodiment may further contain a silane coupling agent as component (I).
- a silane coupling agent as component (I).
- component (I) a known silane coupling agent can be used.
- Component (I) can improve the adhesion of electronic components to a substrate, especially when the substrate contains silicon (for example, a glass substrate, a silicon wafer, an epoxy resin-impregnated glass cloth substrate, etc.) is valid.
- silane coupling agents include alkoxysilanes such as methyltrimethoxysilane, methyltriethoxysilane, phenyltrimethoxysilane, and phenyltriethoxysilane; (meth)acryloxypropyltrimethoxysilane, (meth)acryloxypropylmethyldimethoxysilane (meth)acryloyl group-containing alkoxysilanes such as; ⁇ -aminopropyltrimethoxysilane, ⁇ -aminopropyltriethoxysilane, N-phenyl-3-aminopropyltrimethoxysilane, 3-triethoxysilyl-N-(1, Amine-based alkoxysilanes such as 3-dimethylbutylidene) propylamine; ⁇ -glycidoxypropyltrimethoxysilane, ⁇ -glycidoxypropyltriethoxysilane, glycidoxypropy
- component (I) contains a silane coupling agent having a (meth)acryloyl group from the viewpoint of further improving adhesiveness.
- a silane coupling agent having a (meth)acryloyl group By using a silane coupling agent having a (meth)acryloyl group, the heat resistance of the permanent resist can be maintained and bleeding from the composition can be suppressed.
- a silane coupling agent having a (meth)acryloyl group is not included in component (D).
- Examples of commercially available silane coupling agents having a (meth)acryloyl group include KBM-502, KBM-503, KBE-502, KBE-503, and KBM-5103 (manufactured by Shin-Etsu Silicone Co., Ltd.).
- the content of component (I) may be 0.1 to 10% by mass, 0.5 to 5% by mass, or 1 to 3% by mass based on the total solid content in the photosensitive resin composition. . When the content of component (I) is within the above range, it tends to have excellent adhesion to silicon wafers and excellent resolution.
- the photosensitive resin composition according to the present embodiment may contain a curing agent for the purpose of further improving properties such as heat resistance, adhesion, and chemical resistance of the cured film.
- a curing agent for the purpose of further improving properties such as heat resistance, adhesion, and chemical resistance of the cured film.
- One type of curing agent may be used alone or two or more types may be used in combination.
- Examples of the curing agent include imidazole compounds, guanamine compounds, amine compounds, and triazine compounds.
- Examples of imidazole compounds include 2-methylimidazole, 2-ethyl-4-methylimidazole, 1-benzyl-2-methylimidazole, 2-phenylimidazole, and 2-phenyl-4-methyl-5-hydroxymethylimidazole.
- Examples of guanamine compounds include acetoguanamine and benzoguanamine.
- Examples of the amine compound include diaminodiphenylmethane, m-phenylenediamine, m-xylenediamine, diaminodiphenylsulfone, dicyandiamide, urea, urea derivatives, melamine, and polybasic hydrazide.
- Examples of the triazine compound include ethyldiamino-s-triazine, 2,4-diamino-s-triazine, and 2,4-diamino-6-xylyl-s-triazine.
- the content of the curing agent is 0.01 to 20% by mass, 0.05 to 10% by mass, or 0.05% by mass, based on the total solid content of the photosensitive resin composition. It may be 1 to 5% by mass.
- the photosensitive resin composition according to this embodiment may further contain various additives, if necessary.
- additives include polymerization inhibitors such as hydroquinone, methylhydroquinone, hydroquinone monomethyl ether, catechol, and pyrogallol; thickeners such as bentone and montmorillonite; silicone-based, fluorine-based, and vinyl resin-based antifoaming agents; and bromine.
- Flame retardants such as chemically modified epoxy compounds, acid-modified brominated epoxy compounds, antimony compounds, phosphate compounds, aromatic condensed phosphoric esters, and halogen-containing condensed phosphoric esters can be mentioned.
- the photosensitive resin composition according to the present embodiment contains a solvent to dissolve and disperse each component, thereby making it easy to apply onto a substrate and forming a coating film with a uniform thickness.
- solvents examples include ketones such as methyl ethyl ketone and cyclohexanone; aromatic hydrocarbons such as toluene, xylene, and tetramethylbenzene; methyl cellosolve, butyl cellosolve, methyl carbitol, butyl carbitol, propylene glycol monomethyl ether, dipropylene glycol monoethyl Ethers, glycol ethers such as dipropylene glycol diethyl ether, triethylene glycol monoethyl ether; esters such as ethyl acetate, butyl acetate, butyl cellosolve acetate, carbitol acetate; aliphatic hydrocarbons such as octane, decane; and petroleum ether, petroleum Examples include petroleum solvents such as naphtha, hydrogenated petroleum naphtha, and solvent naphtha. One type of solvent may be used alone or two or more types may be used in combination.
- the amount of the solvent blended is not particularly limited, but the proportion of the solvent in the photosensitive resin composition may be 10 to 50% by mass, 20 to 40% by mass, or 25 to 35% by mass.
- the photosensitive resin composition according to this embodiment can be prepared by uniformly mixing the above-mentioned components using a roll mill, bead mill, etc.
- the photosensitive element according to this embodiment includes a support film and a photosensitive layer containing the above-described photosensitive resin composition.
- FIG. 1 is a cross-sectional view schematically showing a photosensitive element according to this embodiment. As shown in FIG. 1, the photosensitive element 1 includes a support film 10 and a photosensitive layer 20 formed on the support film 10.
- the photosensitive element 1 is prepared by applying the photosensitive resin composition according to the present embodiment onto a support film 10 by a known method such as reverse roll coating, gravure roll coating, comma coating, curtain coating, etc., and then drying the coating film.
- the photosensitive layer 20 can be manufactured by forming the photosensitive layer 20 in the following manner.
- the support film examples include polyester films such as polyethylene terephthalate and polybutylene terephthalate, and polyolefin films such as polypropylene and polyethylene.
- the thickness of the support film may be, for example, 5 to 100 ⁇ m.
- the thickness of the photosensitive layer may be, for example, 5-50 ⁇ m, 5-40 ⁇ m, or 10-30 ⁇ m.
- the surface roughness of the support film is not particularly limited, the arithmetic mean roughness (Ra) may be 1000 nm or less, 500 nm or less, or 250 nm or less.
- drying temperature may be 60-120°C, 70-110°C, or 80-100°C.
- Drying time may be 1-60 minutes, 2-30 minutes, or 5-20 minutes.
- a protective film 30 may be further provided on the photosensitive layer 20 to cover the photosensitive layer 20.
- a protective film 30 can also be laminated on the surface of the photosensitive layer 20 opposite to the surface in contact with the support film 10.
- a polymer film such as polyethylene or polypropylene may be used.
- the printed wiring board according to this embodiment includes a permanent resist containing a cured product of the photosensitive resin composition according to this embodiment.
- the method for manufacturing a printed wiring board according to the present embodiment includes the steps of forming a photosensitive layer on a substrate using the above-described photosensitive resin composition or photosensitive element, and exposing and developing the photosensitive layer to form a resist pattern. and curing the resist pattern to form a permanent resist. An example of each step will be described below.
- a substrate such as a copper-clad laminate is prepared, and a photosensitive layer is formed on the substrate.
- the photosensitive layer may be formed by applying a photosensitive resin composition onto the substrate and drying it. Examples of methods for applying the photosensitive resin composition include screen printing, spraying, roll coating, curtain coating, and electrostatic coating.
- the drying temperature may be 60-120°C, 70-110°C, or 80-100°C. Drying times may be 1-7 minutes, 1-6 minutes, or 2-5 minutes.
- the thickness of the photosensitive layer is preferably 5 ⁇ m or more, and may be 10 to 200 ⁇ m, 15 to 150 ⁇ m, 20 to 100 ⁇ m, or 23 to 50 ⁇ m.
- the photosensitive layer may be formed on the substrate by peeling off the protective film from the photosensitive element and laminating the photosensitive layer.
- Examples of methods for laminating the photosensitive layer include thermal lamination using a laminator.
- a negative film is brought into contact with the photosensitive layer either directly or through a support film, and exposed to actinic light.
- actinic rays include electron beams, ultraviolet rays, and X-rays, with ultraviolet rays being preferred.
- a light source a low-pressure mercury lamp, a high-pressure mercury lamp, an ultra-high-pressure mercury lamp, a halogen lamp, etc. can be used.
- the exposure amount may be 10 to 2000 mJ/cm 2 , 100 to 1500 mJ/cm 2 , or 300 to 1000 mJ/cm 2 .
- a resist pattern is formed by removing the unexposed areas with a developer.
- the developing method include a dipping method and a spray method.
- aqueous alkaline solutions such as potassium hydroxide, sodium hydroxide, sodium carbonate, potassium carbonate, and tetramethylammonium hydroxide can be used.
- a patterned cured film can be formed by subjecting the resist pattern to at least one of post-exposure and post-heating.
- the exposure amount of the post-exposure may be 100 to 5000 mJ/cm 2 , 500 to 2000 mJ/cm 2 , or 700 to 1500 J/cm 2 .
- the heating temperature for post-heating may be 100 to 200°C, 120 to 180°C, or 135 to 165°C.
- the heating time for post-heating may be 5 minutes to 12 hours, 10 minutes to 6 hours, or 30 minutes to 2 hours.
- the permanent resist according to this embodiment can be used as an interlayer insulating layer or a surface protective layer of a semiconductor element.
- a semiconductor element including an interlayer insulating layer or a surface protective layer formed from a cured film of the above-described photosensitive resin composition, and an electronic device including the semiconductor element can be produced.
- the semiconductor device may be, for example, a memory, a package, etc., having a multilayer wiring structure, a rewiring structure, or the like.
- Examples of electronic devices include mobile phones, smartphones, tablet terminals, personal computers, and hard disk suspensions.
- the mixed solution was cooled to 60°C, 2 parts by mass of triphenylphosphine was added, and the mixture was reacted at 100°C until the acid value of the solution became 1 mgKOH/g or less.
- 98 parts by mass of tetrahydrophthalic anhydride (THPAC) and 85 parts by mass of carbitol acetate were added to the reaction solution, and the mixture was reacted at 80° C. for 6 hours. Thereafter, the reaction solution was cooled to room temperature to obtain a solution (solid content concentration: 73% by mass) of acid-modified epoxy acrylate (A-1) as component (A).
- A-1 Acid-modified epoxy acrylate (A-1) of Synthesis Example 1
- B-1 Bisphenol F type epoxy resin (manufactured by Nippon Steel Chemical & Materials Co., Ltd., product name "YDF-8170C", average molecular weight: 310-330, epoxy equivalent: 155-165)
- B-2 Bisphenol A type epoxy resin (manufactured by Nippon Steel Chemical & Materials Co., Ltd., product name "YD-8125”, average molecular weight: 336-356, epoxy equivalent: 168-178)
- B-3 Bisphenol A type epoxy resin (manufactured by Mitsubishi Chemical Corporation, product name "jER828”, average molecular weight: 368-388, epoxy equivalent: 184-194)
- B-4 Phenol novolac type epoxy resin (manufactured by Nippon Kayaku Co., Ltd., trade name "RE-306", average molecular weight: 400, epoxy equivalent: 170-181)
- C-1 2-methyl-[4-[4-
- Photosensitive resin composition Each component was blended in the amounts shown in Table 1 or Table 2 (parts by mass, solid content equivalent) and kneaded using a three-roll mill. Thereafter, carbitol acetate was added so that the solid content concentration was 70% by mass to prepare a photosensitive resin composition.
- a polyethylene terephthalate film (manufactured by Toyobo Film Solutions Co., Ltd., trade name "G2-25") with a thickness of 25 ⁇ m was prepared as a support film.
- a photosensitive layer was formed.
- a polyethylene film (manufactured by Tamapoly Co., Ltd., trade name "NF-15”) was laminated as a protective film on the surface of the photosensitive layer opposite to the side in contact with the support film to obtain a photosensitive element. .
- a copper-clad laminate board (manufactured by Showa Denko Materials Co., Ltd., trade name "MCL-E-67”) with a thickness of 0.6 mm was prepared. While peeling and removing the protective film from the photosensitive element, it was pressed onto the copper-clad laminate board using a press-type vacuum laminator (manufactured by Meiki Seisakusho Co., Ltd., product name "MVLP-500”) at a pressure of 0.4 MPa. The photosensitive layers were laminated at a hot plate temperature of 80° C., a vacuum time of 25 seconds, and a lamination press time of 25 seconds to obtain a laminate.
- a negative mask having an opening pattern of a predetermined size (opening diameter size: 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 150, 200 ⁇ m) is brought into close contact with the support film of the laminate, Using an ultraviolet exposure device (manufactured by Oak Co., Ltd., trade name "EXM-1201"), the photosensitive layer was exposed to light at an exposure amount that would result in 13 stages of complete curing on a step tablet (manufactured by Showa Denko Materials Co., Ltd.).
- an ultraviolet exposure device manufactured by Oak Co., Ltd., trade name "EXM-1201”
- the support film was peeled off from the photosensitive layer, and spray development was performed using a 1% by mass aqueous sodium carbonate solution at a pressure of 1.765 ⁇ 10 5 Pa for 60 seconds to dissolve and develop the unexposed areas.
- the developed photosensitive layer was exposed to light at an exposure dose of 2000 mJ/cm 2 using an ultraviolet exposure device, and then heated at 170°C for 1 hour to form an opening pattern of a predetermined size on the copper-clad laminate.
- a test piece with a cured film formed was prepared. The above test piece was observed using an optical microscope and evaluated based on the following criteria.
- B The minimum opening diameter size exceeded 30 ⁇ m and was 50 ⁇ m or less.
- C The minimum opening diameter size exceeded 50 ⁇ m.
- Thermal shock resistance A temperature cycle test was performed on the test piece prepared for resolution evaluation, with one cycle of -65°C for 30 minutes and 150°C for 30 minutes, and at the 1000th cycle and 2000th cycle, the test piece was visually inspected and Observation was made using an optical microscope and evaluation was made using the following criteria. A: No cracks were observed after 2000 cycles. B: No cracks were observed after 1000 cycles, but cracks were observed after 2000 cycles. C: Occurrence of cracks was confirmed after 1000 cycles.
- the test piece prepared for resolution evaluation was placed in a 150°C environment, and after 1000 hours and 2000 hours, the test piece was observed visually and with an optical microscope, and evaluated based on the following criteria.
- a laminate having a photosensitive layer was produced in the same manner as the laminate produced for resolution evaluation, except that the copper-clad laminate was replaced with a 6-inch silicon wafer (manufactured by Electronics End Materials Corporation). The entire surface of the laminate was exposed to light at 500 mJ/cm 2 using an i-line exposure device (manufactured by Ushio Inc., trade name "UX-2240SM-XJ-01"). Next, the support film was peeled off from the photosensitive layer, and the photosensitive layer was further exposed to light at an exposure dose of 2000 mJ/cm 2 using an ultraviolet exposure device, and then heated at 170° C. for 1 hour to deposit the photosensitive resin composition on the silicon wafer. A cured film was formed.
- an aluminum stud pin with epoxy adhesive (manufactured by Phototechnica Co., Ltd., product name "P/N901106", adhesive part diameter: 2.7 mm) was vertically installed on the cured film, and heated at 150°C for 1 hour. A test piece was obtained by heating. The stud pin on the test piece was fixed to the chuck of a thin film adhesion strength measuring device (manufactured by Phototechnica Co., Ltd.), and a force was applied perpendicularly to the cured film. The adhesion of the cured film to the silicon wafer was evaluated based on the following criteria. A: The epoxy adhesive failed cohesively without peeling off at the interface between the cured film and the silicon wafer. B: Peeling occurred at the interface between the cured film and the silicon wafer.
- Photosensitive element 10
- Support film 20
- Photosensitive layer 30
- Protective film
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Abstract
Description
[1](A)酸変性ビニル基含有樹脂、(B)熱硬化性樹脂、(C)光重合開始剤、(D)光重合性化合物、及び(E)エラストマーを含有し、前記熱硬化性樹脂が、平均分子量が360以下のビスフェノール型エポキシ化合物を含み、前記エラストマーが、アクリル系エラストマーを含む、感光性樹脂組成物。
[2]前記熱硬化性樹脂の含有量が、前記感光性樹脂組成物の固形分全量を基準として、5~25質量%である、上記[1]に記載の感光性樹脂組成物。
[3]前記アクリル系エラストマーがカルボキシ基を有する、上記[1]又は[2]に記載の感光性樹脂組成物。
[4]前記アクリル系エラストマーがn-ブチル基を更に有する、上記[3]に記載の感光性樹脂組成物。
[5]前記アクリル系エラストマーの重量平均分子量が、5000~20000である、上記[1]~[4]のいずれかに記載の感光性樹脂組成物。
[6](I)シランカップリング剤を更に含有する、上記[1]~[5]のいずれかに記載の感光性樹脂組成物。
[7](F)無機フィラーを更に含有する、上記[1]~[6]のいずれかに記載の感光性樹脂組成物。
[8]支持フィルムと、前記支持フィルム上に形成された感光層とを備え、前記感光層が、上記[1]~[7]のいずれかに記載の感光性樹脂組成物を含む、感光性エレメント。
[9]上記[1]~[7]のいずれかに記載の感光性樹脂組成物の硬化物を含む永久レジストを具備する、プリント配線板。
[10]基板上に、上記[1]~[7]のいずれかに記載の感光性樹脂組成物を用いて感光層を形成する工程と、前記感光層を露光及び現像してレジストパターンを形成する工程と、前記レジストパターンを硬化して永久レジストを形成する工程と、を備える、プリント配線板の製造方法。
[11]基板上に、上記[8]に記載の感光性エレメントを用いて感光層を形成する工程と、前記感光層を露光及び現像してレジストパターンを形成する工程と、前記レジストパターンを硬化して永久レジストを形成する工程と、を備える、プリント配線板の製造方法。
本実施形態に係る感光性樹脂組成物は、(A)酸変性ビニル基含有樹脂、(B)熱硬化性樹脂、(C)光重合開始剤、(D)光重合性化合物、及び(E)エラストマーを必須成分として含有する。本実施形態に係る感光性樹脂組成物は、ネガ型の感光性樹脂組成物であり、感光性樹脂組成物の硬化膜は、永久レジストとして好適に用いることができる。以下、本実施形態の感光性樹脂組成物で用いられる各成分についてより詳細に説明する。
本実施形態に係る感光性樹脂組成物は、(A)成分として酸変性ビニル基含有樹脂を含有する。酸変性ビニル基含有樹脂は、光重合性のエチレン性不飽和結合であるビニル結合と、アルカリ可溶性の酸性基とを有していれば、特に限定されない。
GPC装置:高速GPC装置「HCL-8320GPC」(東ソー株式会社製)
検出器 :示差屈折計又はUV検出器(東ソー株式会社製)
カラム :カラムTSKgel SuperMultipore HZ-H(カラム長さ:15cm、カラム内径:4.6mm)(東ソー株式会社製)
溶離液 :テトラヒドロフラン(THF)
測定温度 :40℃
流量 :0.35mL/分
試料濃度 :10mg/THF5mL
注入量 :20μL
本実施形態に係る感光性樹脂組成物は、(B)成分として熱硬化性樹脂を含有し、(B)成分は、平均分子量が360以下のビスフェノール型エポキシ化合物(以下、「(B1)成分」と称する場合がある。)を含む。本実施形態に係る感光性樹脂組成物は、(B1)成分を含有することで、良好な解像性を維持しつつ、感光性樹脂組成物から形成される硬化膜(永久レジスト)の耐熱性及び耐熱衝撃性を向上することができる。
(C)成分である光重合開始剤としては、(A)成分及び(D)成分を重合させることができれば、特に限定されない。(C)成分は、1種を単独で又は2種以上を組み合わせて用いてよい。
本実施形態に係る感光性樹脂組成物は、露光部の耐薬品性を高め、露光部と未露光部との耐現像液性の差を大きくする観点から、(D)成分として光重合性化合物を含有する。(D)成分は、光重合性の官能基を有し、酸性基を有しない光重合性化合物であればよく、特に限定されない。光重合性の官能基としては、例えば、ビニル基、アリル基、プロパギル基、ブテニル基、エチニル基、フェニルエチニル基、マレイミド基、ナジイミド基、(メタ)アクリロイル基等のエチレン性不飽和結合を有する基が挙げられる。
本実施形態に係る感光性樹脂組成物は、(E)成分としてエラストマーを含有することにより、(A)成分の硬化収縮による樹脂内部の歪み(内部応力)に起因する可とう性及び接着強度の低下を抑えることができる。(E)成分は、アクリル系エラストマーを含むことで、感光性樹脂組成物から形成される硬化膜の耐熱性及び耐衝撃性を向上することができる。
本実施形態に係る感光性樹脂組成物は、(F)成分として無機フィラーを更に含有してもよい。(F)成分を含有することで、永久レジストの接着強度及び硬度を向上することができる。(F)成分は、1種を単独で又は2種以上を組み合わせて用いてよい。
本実施形態に係る感光性樹脂組成物は、製造装置の識別性又は外観を向上させる観点から、(G)成分として顔料を更に含有してもよい。(G)成分としては、配線(導体パターン)を隠蔽する等の際に所望の色を発色する着色剤を用いることができる。(G)成分は、1種を単独で又は2種以上を組み合わせて用いてよい。
本実施形態に係る感光性樹脂組成物は、レジスト形状、密着性、流動性、及び信頼性を向上する観点から、(H)成分としてイオン捕捉剤を更に含有してもよい。(H)成分は、イオン捕捉剤中にイオンを捕捉できるものであって、陽イオン及び陰イオンの少なくとも一方を捕捉する機能を有するものであれば特に制限はない。
本実施形態に係る感光性樹脂組成物は、(I)成分としてシランカップリング剤を更に含有してもよい。(I)成分としては、公知のシランカップリング剤を用いることができる。(I)成分は、電子部品の基板との接着性を向上させることができ、特に、該基板がケイ素を含有する基板(例えば、ガラス基板、シリコンウェハ、エポキシ樹脂含浸ガラスクロス基板等)の場合は有効である。
本実施形態に係る感光性樹脂組成物は、硬化膜の耐熱性、密着性、耐薬品性等の特性を更に向上する目的で、硬化剤を含有してもよい。硬化剤は1種を単独で又は2種以上を組み合わせて用いてもよい。
本実施形態に係る感光性樹脂組成物には、必要に応じて、各種添加剤を更に含有してもよい。添加剤としては、例えば、ハイドロキノン、メチルハイドロキノン、ハイドロキノンモノメチルエーテル、カテコール、ピロガロール等の重合禁止剤;ベントン、モンモリロナイト等の増粘剤;シリコーン系、フッ素系、ビニル樹脂系の消泡剤;及び臭素化エポキシ化合物、酸変性臭素化エポキシ化合物、アンチモン化合物、ホスフェート化合物、芳香族縮合リン酸エステル、含ハロゲン縮合リン酸エステル等の難燃剤が挙げられる。
本実施形態に係る感光性樹脂組成物は、各成分を溶解・分散させるため溶剤を含有することにより、基板上への塗布を容易にし、均一な厚さの塗膜を形成できる。
本実施形態に係る感光性エレメントは、支持フィルムと、上述した感光性樹脂組成物を含む感光層とを備える。図1は、本実施形態に係る感光性エレメントを模式的に示す断面図である。図1に示されるように、感光性エレメント1は、支持フィルム10と、支持フィルム10上に形成された感光層20とを備えている。
本実施形態に係るプリント配線板は、本実施形態に係る感光性樹脂組成物の硬化物を含む永久レジストを具備する。
ビスフェノールFノボラック型エポキシ樹脂(DIC株式会社製、商品名「EXA-7376」、式(II)において、Y3及びY4がグリシジル基、R12が水素原子である構造単位を有するビスフェノールFノボラック型エポキシ樹脂、エポキシ当量:186)350質量部、アクリル酸70質量部、メチルハイドロキノン0.5質量部、及びカルビトールアセテート120質量部を90℃で撹拌しながら混合した。混合液を60℃に冷却し、トリフェニルホスフィン2質量部を加え、100℃で溶液の酸価が1mgKOH/g以下になるまで反応させた。反応液に、テトラヒドロ無水フタル酸(THPAC)98質量部及びカルビトールアセテート85質量部を加え、80℃で6時間反応させた。その後、反応液を室温まで冷却し、(A)成分としての酸変性エポキシアクリレート(A-1)の溶液(固形分濃度:73質量%)を得た。
撹拌機、窒素導入管及び温度計を備えた100mLの三口フラスコに、乳酸エチルを70g、アクリル酸メチルを13.4g、アクリル酸n-ブチルを22.5g、アクリル酸を2.0g、及びアゾビスイソブチロニトリルを3.0g添加した後、室温で約160rpmで撹拌しながら、窒素ガスを400mL/分の流量で30分間流し、フラスコ内の溶存酸素を除去した。その後、窒素ガスの流入を止め、フラスコを密閉し、恒温水槽にて約25分で65℃まで昇温した。同温度で10時間保持して重合反応を行い、アクリル系エラストマー(E-1)を得た。E-1のMwは約10000であった。
乳酸エチルを70g、アクリル酸メチルを2.8g、アクリル酸n-ブチルを13.3g、アクリル酸を2.4g、及びアゾビスイソブチロニトリルを1.0g添加した以外はE-1の合成と同じ手順で重合反応を行い、アクリル系エラストマー(E-2)を得た。E-2のMwは約15000であった。
A-1:合成例1の酸変性エポキシアクリレート(A-1)
B-1:ビスフェノールF型エポキシ樹脂(日鉄ケミカル&マテリアル株式会社製、商品名「YDF-8170C」、平均分子量:310~330、エポキシ当量:155~165)
B-2:ビスフェノールA型エポキシ樹脂(日鉄ケミカル&マテリアル株式会社製、商品名「YD-8125」、平均分子量:336~356、エポキシ当量:168~178)
B-3:ビスフェノールA型エポキシ樹脂(三菱ケミカル株式会社製、商品名「jER828」、平均分子量:368~388、エポキシ当量:184~194)
B-4:フェノールノボラック型エポキシ樹脂(日本化薬株式会社製、商品名「RE-306」、平均分子量:400、エポキシ当量:170~181)
C-1:2-メチル-[4-(メチルチオ)フェニル]モルホリノ-1-プロパノン(IGM Resins B.V.製、商品名「Omirad 907」)
C-2:2,4-ジエチルチオキサントン(日本化薬株式会社製、商品名「DETX-S」)
C-3:4,4’-ビス(ジエチルアミノ)ベンゾフェノン(EAB)
C-4:エタノン,1-[9-エチル-6-(2-メチルベンゾイル)-9H-カルバゾール-3-イル]-,1-(0-アセチルオキシム)(BASFジャパン株式会社製、商品名「Irgacure OXE02」)
D-1:ジペンタエリストールヘキサアクリレート(日本化薬株式会社製、商品名「DPHA」)
E-1:合成例2のアクリル系エラストマー(E-1)
E-2:合成例3のアクリル系エラストマー(E-2)
F-1:シリカ(デンカ株式会社製、商品名「SFP20M」、平均粒径:0.3μm)
F-2:硫酸バリウム(堺化学工業株式会社製、商品名「B-34」、平均粒径:0.3μm)
G-1:フタロシアニン系顔料(山陽色素株式会社製)
H-1:Zr、Mg、Al含有両イオン捕捉剤(東亞合成株式会社製、商品名「IXEPLAS-A2」、平均粒径:0.2μm、Zr化合物の含有量:20~30質量%)
I-1:3-メタクリロキシプロピルトリエトキシシラン(信越化学工業株式会社製、商品名「KBM-503」)
表1又は表2に示す配合量(質量部、固形分換算量)で各成分を配合し、3本ロールミルで混練した。その後、固形分濃度が70質量%になるようにカルビトールアセテートを加えて、感光性樹脂組成物を調製した。
支持フィルムとして、厚さ25μmのポリエチレンテレフタレートフィルム(東洋紡フィルムソリューション株式会社製、商品名「G2-25」)を準備した。支持フィルム上に、感光性樹脂組成物にメチルエチルケトンを加えて希釈した溶液を、乾燥後の厚さが25μmとなるように塗布し、熱風対流式乾燥機を用いて75℃で30分間乾燥し、感光層を形成した。次いで、感光層の支持フィルムと接している側とは反対側の表面上に、ポリエチレンフィルム(タマポリ株式会社製、商品名「NF-15」)を保護フィルムとして貼り合わせ、感光性エレメントを得た。
厚さ0.6mmの銅張積層基板(昭和電工マテリアルズ株式会社製、商品名「MCL-E-67」)を準備した。感光性エレメントから保護フィルムを剥離除去しながら、銅張積層基板上に、プレス式真空ラミネータ(株式会社名機製作所製、商品名「MVLP-500」)を用いて、圧着圧力0.4MPa、プレス熱板温度80℃、真空引き時間25秒間、ラミネートプレス時間25秒間で、感光層をラミネートして、積層体を得た。次いで、所定サイズの開口パターン(開口径サイズ:30、40、50、60、70、80、90、100、110、120、150、200μm)を有するネガマスクを上記積層体の支持フィルムに密着させ、紫外線露光装置(オーク株式会社製、商品名「EXM-1201」)を用いて、ステップタブレット(昭和電工マテリアルズ株式会社製)における完全硬化段数が13段となる露光量で感光層を露光した。その後、感光層から支持フィルムを剥離し、1質量%の炭酸ナトリウム水溶液を用いて、60秒間、1.765×105Paの圧力でスプレー現像し、未露光部を溶解現像した。次に、紫外線露光装置を用いて、現像後の感光層を2000mJ/cm2の露光量で露光した後、170℃で1時間加熱して、銅張積層基板上に、所定サイズの開口パターンが形成さられた硬化膜を有する試験片を作製した。上記試験片を、光学顕微鏡を用いて観察し、以下の基準で評価した。
A:最小の開口径サイズが30μm以下であった。
B:最小の開口径サイズが30μmを超え、50μm以下であった。
C:最小の開口径サイズが50μmを超えた。
上記試験片を、包埋樹脂(エポキシ樹脂として三菱ケミカル株式会社製の商品名「jER828」、硬化剤としてトリエチレンテトラミンを使用)で注型し十分硬化させた後、研磨機(リファインテック株式会社製、商品名「リファインポリッシャー」)で研磨して、硬化膜の開口パターンの断面を削り出した。得られた開口パターンの断面を、金属顕微鏡を用いて観察し、以下の基準で評価した。
A:アンダーカット及びレジスト上部の欠落が確認されず、且つ、パターン輪郭の直線性が良かった。
B:アンダーカット若しくはレジスト上部の欠落が確認された、又はパターン輪郭の直線性が悪かった。
解像性の評価で作製した試験片に対して、-65℃で30分間及び150℃で30分間を1サイクルとして温度サイクル試験を実施し、1000サイクル及び2000サイクルの時点で試験片を目視及び光学顕微鏡で観察し、以下の基準で評価した。
A:2000サイクルでクラックの発生が確認されなかった。
B:1000サイクルでクラックの発生が確認されなかったが、2000サイクルでクラックの発生が確認された。
C:1000サイクルでクラックの発生が確認された。
解像性の評価で作製した試験片を150℃の環境に置き、1000時間後及び2000時間後に試験片を目視及び光学顕微鏡で観察し、以下の基準で評価した。
A:2000時間でクラックの発生が確認されなかった。
B:1000時間でクラックの発生は確認されなかったが、2000時間でクラックの発生が確認された。
C:1000時間でクラックの発生が確認された。
銅張積層基板を6インチのシリコンウェハ(株式会社エレクトロニクスエンドマテリアルズコーポレーション製)に代えた以外は、解像度の評価で作製した積層体と同様の手順で、感光層を有する積層体を作製した。該積層体を、i線露光装置(ウシオ電機株式会社製、商品名「UX-2240SM―XJ-01」)を用いて500mJ/cm2で全面露光した。次いで、感光層から支持フィルムを剥離し、紫外線露光装置を用いて2000mJ/cm2の露光量で感光層を更に露光した後、170℃で1時間加熱し、シリコンウェハ上に感光性樹脂組成物の硬化膜を形成した。その後、硬化膜上に、エポキシ接着剤付Al製スタッドピン(フォトテクニカ株式会社製、商品名「P/N901106」、接着部直径:2.7mm、)を垂直に設置し、150℃で1時間加熱して、試験片を得た。試験片上のスタッドピンを薄膜密着強度測定装置(フォトテクニカ株式会社製)のチャックへ固定し、硬化膜に対して垂直に力を加えた。硬化膜のシリコンウェハに対する接着性を以下の基準で評価した。
A:硬化膜とシリコンウェハとの界面で剥離せずに、エポキシ接着剤が凝集破壊した。
B:硬化膜とシリコンウェハとの界面で剥離した。
Claims (11)
- (A)酸変性ビニル基含有樹脂、(B)熱硬化性樹脂、(C)光重合開始剤、(D)光重合性化合物、及び(E)エラストマーを含有し、
前記熱硬化性樹脂が、平均分子量が360以下のビスフェノール型エポキシ化合物を含み、
前記エラストマーが、アクリル系エラストマーを含む、感光性樹脂組成物。 - 前記熱硬化性樹脂の含有量が、前記感光性樹脂組成物の固形分全量を基準として、5~25質量%である、請求項1に記載の感光性樹脂組成物。
- 前記アクリル系エラストマーがカルボキシ基を有する、請求項1に記載の感光性樹脂組成物。
- 前記アクリル系エラストマーがn-ブチル基を更に有する、請求項3に記載の感光性樹脂組成物。
- 前記アクリル系エラストマーの重量平均分子量が、5000~20000である、請求項1に記載の感光性樹脂組成物。
- (I)シランカップリング剤を更に含有する、請求項1に記載の感光性樹脂組成物。
- (F)無機フィラーを更に含有する、請求項1に記載の感光性樹脂組成物。
- 支持フィルムと、前記支持フィルム上に形成された感光層とを備え、
前記感光層が、請求項1~7のいずれか一項に記載の感光性樹脂組成物を含む、感光性エレメント。 - 請求項1~7のいずれか一項に記載の感光性樹脂組成物の硬化物を含む永久レジストを具備する、プリント配線板。
- 基板上に、請求項1~7のいずれか一項に記載の感光性樹脂組成物を用いて感光層を形成する工程と、
前記感光層を露光及び現像してレジストパターンを形成する工程と、
前記レジストパターンを硬化して永久レジストを形成する工程と、
を備える、プリント配線板の製造方法。 - 基板上に、請求項8に記載の感光性エレメントを用いて感光層を形成する工程と、
前記感光層を露光及び現像してレジストパターンを形成する工程と、
前記レジストパターンを硬化して永久レジストを形成する工程と、
を備える、プリント配線板の製造方法。
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| US18/858,051 US20250271758A1 (en) | 2022-05-06 | 2023-04-27 | Photosensitive resin composition, photosensitive element, printed wiring board, and method for producing printed wiring board |
| KR1020247035334A KR20250005161A (ko) | 2022-05-06 | 2023-04-27 | 감광성 수지 조성물, 감광성 엘리먼트, 프린트 배선판, 및 프린트 배선판의 제조 방법 |
| JP2024519207A JPWO2023214540A1 (ja) | 2022-05-06 | 2023-04-27 | |
| CN202380035615.5A CN119072656A (zh) | 2022-05-06 | 2023-04-27 | 感光性树脂组合物、感光性元件、印刷线路板及印刷线路板的制造方法 |
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| KR (1) | KR20250005161A (ja) |
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| JPWO2023214540A1 (ja) | 2023-11-09 |
| CN119072656A (zh) | 2024-12-03 |
| US20250271758A1 (en) | 2025-08-28 |
| TW202402822A (zh) | 2024-01-16 |
| KR20250005161A (ko) | 2025-01-09 |
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