WO2018146821A1 - 感光性樹脂組成物、該感光性樹脂組成物を用いたソルダーレジストフィルム、フレキシブルプリント配線板及び画像表示装置 - Google Patents
感光性樹脂組成物、該感光性樹脂組成物を用いたソルダーレジストフィルム、フレキシブルプリント配線板及び画像表示装置 Download PDFInfo
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- resin composition
- photosensitive resin
- solder resist
- flexible printed
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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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- 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
- G03F7/029—Inorganic compounds; Onium compounds; Organic compounds having hetero atoms other than oxygen, nitrogen or sulfur
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1345—Conductors connecting electrodes to cell terminals
- G02F1/13452—Conductors connecting driver circuitry and terminals of panels
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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
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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
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/004—Photosensitive materials
- G03F7/039—Macromolecular compounds which are photodegradable, e.g. positive electron resists
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/26—Processing photosensitive materials; Apparatus therefor
- G03F7/40—Treatment after imagewise removal, e.g. baking
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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
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0213—Electrical arrangements not otherwise provided for
- H05K1/0216—Reduction of cross-talk, noise or electromagnetic interference
- H05K1/0218—Reduction of cross-talk, noise or electromagnetic interference by printed shielding conductors, ground planes or power plane
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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
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0277—Bendability or stretchability details
-
- 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
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/03—Use of materials for the substrate
- H05K1/0313—Organic insulating material
- H05K1/032—Organic insulating material consisting of one material
- H05K1/0346—Organic insulating material consisting of one material containing N
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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
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/03—Use of materials for the substrate
- H05K1/0393—Flexible materials
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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
- H05K3/02—Apparatus or processes for manufacturing printed circuits in which the conductive material is applied to the surface of the insulating support and is thereafter removed from such areas of the surface which are not intended for current conducting or shielding
- H05K3/06—Apparatus or processes for manufacturing printed circuits in which the conductive material is applied to the surface of the insulating support and is thereafter removed from such areas of the surface which are not intended for current conducting or shielding the conductive material being removed chemically or electrolytically, e.g. by photo-etch process
- H05K3/061—Etching masks
- H05K3/064—Photoresists
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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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- 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
- H05K2201/0137—Materials
- H05K2201/0154—Polyimide
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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
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/05—Flexible printed circuits [FPCs]
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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
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/07—Electric details
- H05K2201/0707—Shielding
- H05K2201/0715—Shielding provided by an outer layer of PCB
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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
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/07—Electric details
- H05K2201/0753—Insulation
- H05K2201/0761—Insulation resistance, e.g. of the surface of the PCB between the conductors
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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
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/07—Electric details
- H05K2201/0776—Resistance and impedance
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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
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
- H05K2201/10007—Types of components
- H05K2201/10128—Display
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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
- H05K3/30—Assembling printed circuits with electric components, e.g. with resistor
- H05K3/32—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits
- H05K3/34—Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by soldering
- H05K3/3452—Solder masks
Definitions
- the present invention relates to a photosensitive resin composition, and more specifically, a photosensitive resin composition used for a dry film resist used for a flexible printed wiring board, a solder resist film using the photosensitive resin composition, and a flexible printed wiring board.
- the present invention also relates to an image display device provided with the flexible printed wiring board.
- Flexible Printed Circuit Boards have features such as flexibility and flexibility, and various types of mobile phones, video cameras, laptop computers, etc. that are rapidly becoming smaller, lighter and thinner. In an electronic device, it is frequently used to incorporate a circuit in a complicated mechanism.
- FPC is composed of a copper clad laminate (CCL) with a circuit formed by an etching process and a cover coat material.
- the cover coating material is generally selected from a cover lay (CL) film, a photosensitive ink, a photosensitive film (photosensitive cover lay film), and the like.
- a surface protective material for FPC an adhesive is applied to a molded body (support) such as a polyimide film because of its ease of handling, durability, and high insulation reliability in the thickness direction. Many of the resulting coverlay films are used.
- FPC is mainly described, but it can also be used for semiconductor package applications (semiconductor PKG applications).
- a substrate formed by printing using paste-like nano ink containing conductive fine particles such as silver particles and copper particles is also used as an FPC substrate.
- FPC substrate a substrate formed by printing using paste-like nano ink containing conductive fine particles such as silver particles and copper particles.
- CCL will be mainly described, but it also includes a substrate on which a circuit is formed by printing using a paste-like nano ink containing conductive fine particles such as silver particles and copper particles.
- solder resist has recently been used as a surface protective material for FPC, and a solder resist having a photosensitive function is particularly preferably used when fine processing is required.
- an electromagnetic wave shield may be provided because the CCL circuit is easily affected by electromagnetic waves or the like when the solder resist layer becomes thinner due to downsizing and thinning of electronic equipment.
- ions metal ions
- Z-axis direction A migration phenomenon that moves in a certain solder resist layer is likely to occur in the thickness direction of the FPC (hereinafter also referred to as “Z-axis direction”).
- the metal ions eluted in the solder resist layer come into contact with each other to cause a short circuit, leading to a system failure or the like.
- polyimide is excellent in insulation, so when using a coverlay film with a polyimide layer, migration in the thickness direction is unlikely to occur, but when using a solder resist, migration in the thickness direction occurs. It's easy to do.
- Patent Document 1 discloses (A) a) an epoxy resin having two or more epoxy groups in one molecule and b) one carboxyl group.
- Carboxyl group-containing photosensitivity obtained by adding d) a polybasic acid anhydride to a reaction product of at least one fatty acid having 10 or more carbon atoms per unit and c) an ethylenically unsaturated group-containing carboxylic acid
- Photosensitive resin containing resin, (B) photopolymerization initiator, (C) (meth) acrylate monomer having hydrophobic skeleton, (D) epoxy compound, and (E) inorganic cation exchanger Compositions have been proposed. According to the photosensitive resin composition described in Patent Document 1, an insulating coating excellent in insulation reliability in the thickness direction is obtained.
- the migration phenomenon was thought to occur mainly in the direction horizontal to the plane of the FPC (hereinafter also referred to as “XY plane direction”), but as described above, the insulation layer (solder in the Z-axis direction) It has been found that when the thickness of the resist layer is reduced, it is necessary to consider the migration phenomenon in the Z-axis direction more than in the XY plane direction. In other words, it has been recognized that the Z-axis direction is more likely to cause a migration phenomenon than the XY plane direction. The reason is not clear, but according to the confirmation test of the present inventors, using a known resin composition (for example, a resin composition described in Japanese Patent Application Laid-Open No.
- L / S 15/15 ⁇ m
- an interlayer thickness in the Z-axis direction of 15 ⁇ m When a migration resistance test was performed by applying 50 V for 1000 hours in an environment of 85 ° C. and 85% RH (note that a sample manufacturing method is described later), the distance between the lines and the distance between the layers are the same.
- the test piece with the line spacing of 15 ⁇ m in the XY plane direction maintained insulation even after 1000 hours, but the test piece with the interlayer thickness in the Z-axis direction of 15 ⁇ m was 100 Short before reaching time It was.
- the insulation reliability in the thickness direction at 20 ⁇ m has been confirmed, but in the current situation where further downsizing and thinning are required, the solder resist layer is thinner (for example, the thickness is less than 20 ⁇ m). )
- the solder resist layer is thinner (for example, the thickness is less than 20 ⁇ m).
- the heat resistance of the solder resist that is, to harden the resin.
- the solder resist layer becomes brittle.
- warping is likely to occur during curing, and curling increases when the substrate is molded. Therefore, it is required to have flexibility while providing migration resistance.
- a dry resist film is formed using a solder resist
- an object of the present invention is a photosensitive resin composition used for forming a solder resist layer, and obtaining a dry resist film having excellent migration resistance and storage stability in the thickness direction (Z-axis direction). It is providing the photosensitive resin composition which can be performed, the soldering resist film using this photosensitive resin composition, a flexible printed wiring board, and an image display apparatus provided with this flexible printed wiring board.
- the present inventors have obtained a photosensitive resin composition containing a photosensitive prepolymer, a photopolymerization initiator, and a thermosetting agent, as a thermosetting agent. It has been found that the above problems can be solved by constituting a solder resist film with a photosensitive resin composition using a polycarbodiimide compound having specific physical properties, and the present invention has been completed.
- the present invention includes the following ⁇ 1> to ⁇ 9>.
- ⁇ 1> A photosensitive prepolymer having a carboxyl group and an ethylenically unsaturated group, a photopolymerization initiator, and a thermosetting agent, wherein the thermosetting agent is an amino group that dissociates at a temperature of 80 ° C. or higher.
- R 1 and R 2 are each independently a hydrogen atom, a linear or branched alkyl group having 1 to 6 carbon atoms, or a cycloalkyl group having 3 to 6 carbon atoms; 1 and R 2 may be the same as or different from each other, but they are not hydrogen atoms, X 1 and X 2 each represent —R 3 —NH—COOR 4 , and R 3 is at least 1 A divalent organic group having one aromatic group, R 4 is a residue obtained by removing a hydroxyl group from an organic group having one hydroxyl group, and X 1 and X 2 may be the same or different from each other; Y represents —R 5 —NHCOO—R 6 —OCOHN—R 5 —, each R 5 independently represents a divalent organic group having at least one aromatic group, and R 6 represents a divalent organic group.
- R 6 is not an ether bond
- n is an integer of 1 to 5.
- ⁇ 2> The photosensitive resin composition according to ⁇ 1>, wherein the number of functional groups of the carbodiimide of the polycarbodiimide compound is 2 to 5.
- ⁇ 3> The ⁇ 1> or ⁇ 2>, wherein the carbodiimide equivalent of the polycarbodiimide compound is 0.9 to 1.3 equivalents relative to the carboxyl group of the photosensitive prepolymer.
- ⁇ 4> The photosensitive resin composition according to any one of ⁇ 1> to ⁇ 3>, which is used for a solder resist film.
- ⁇ 5> A solder resist film formed using the photosensitive resin composition according to any one of ⁇ 1> to ⁇ 4>.
- a shield layer containing a conductive material is provided on the solder resist layer, and the solder resist layer is formed such that an interlayer distance between the wiring pattern and the shield layer is 10 ⁇ m with a film thickness after curing.
- a flexible printed wiring board comprising: a substrate including a wiring pattern; a solder resist layer covering the wiring pattern; and a shield layer provided on the solder resist layer.
- An acylurea is included, the shield layer is made of a conductive material, and when the interlayer distance between the wiring pattern after hot-pressing and the shield layer is less than 20 ⁇ m, the electrical insulating property of the flexible printed wiring board has a temperature of 85 ° C., A flexible printed wiring board characterized by having a resistance value of 1.0 ⁇ 10 7 ⁇ or more while applying a voltage of 50 V in an atmosphere with a relative humidity of 85% RH, and the resistance value continues for 500 hours or more. ⁇ 9> An image display device comprising the flexible printed wiring board according to any one of ⁇ 6> to ⁇ 8>.
- a solder resist film having sufficient migration resistance in the Z-axis direction even on a predetermined metal circuit layer even if it is a thin film (for example, a film having a thickness of 20 ⁇ m or less). It is possible to form a (cured film).
- the photosensitive resin composition of this invention since the carbodiimide group in a polycarbodiimide compound is protected by the amino group, it does not react with the photosensitive prepolymer in the composition. Thereby, even after heat processing at a temperature of less than 80 ° C. to form a film, the reaction of carbodiimide can be suppressed, and the film can be stored at room temperature for 2 weeks or more. That is, development is possible even after a lapse of time after film formation.
- the flexible printed wiring board provided with the soldering resist layer formed using the photosensitive resin composition of this invention can be used suitably as an electronic material component used for the electronic device in which size reduction and thickness reduction are calculated
- (meth) acrylic acid means acrylic acid or methacrylic acid, and the same applies to (meth) acrylate.
- all the percentages and parts represented by mass are the same as the percentages and parts represented by weight.
- the photosensitive resin composition of the present invention contains a photosensitive prepolymer having a carboxyl group and an ethylenically unsaturated group, a photopolymerization initiator, and a thermosetting agent, and the thermosetting agent has a carbodiimide group of 80 ° C. or higher.
- R 1 and R 2 are each independently a hydrogen atom, a linear or branched alkyl group having 1 to 6 carbon atoms, or a cycloalkyl group having 3 to 6 carbon atoms; 1 and R 2 may be the same as or different from each other, but they are not hydrogen atoms, X 1 and X 2 each represent —R 3 —NH—COOR 4 , and R 3 is at least 1 A divalent organic group having one aromatic group, R 4 is a residue obtained by removing a hydroxyl group from an organic group having one hydroxyl group, and X 1 and X 2 may be the same or different from each other; Y represents —R 5 —NHCOO—R 6 —OCOHN—R 5 —, each R 5 independently represents a divalent organic group having at least one aromatic group, and R 6 represents a divalent organic group. Where R 6 is not an ether bond, and n is an integer of 1 to 5. Represents a number.
- photosensitive prepolymer As the photosensitive prepolymer in the present embodiment, one having an ethylenically unsaturated end group derived from an acrylic monomer is preferably used.
- the acrylic monomer here is acrylic acid or methacrylic acid, or a derivative thereof such as an alkyl ester or a hydroxyalkyl ester.
- Examples of such a photosensitive prepolymer include polyester acrylate, epoxy acrylate, urethane acrylate, acrylated acrylate, polybutadiene acrylate, silicone acrylate, melamine acrylate, and the like.
- epoxy acrylate and urethane acrylate are preferable from the viewpoint of excellent balance of flexibility, heat resistance, and adhesiveness.
- the photosensitive prepolymer of the present embodiment is not particularly limited as long as it satisfies the above conditions, but one having both a carboxyl group and at least two ethylenically unsaturated groups in one molecule is used.
- an epoxy (meth) acrylate compound (EA) having a carboxyl group or a urethane (meth) acrylate compound (UA) having a carboxyl group is particularly preferable.
- Epoxy (meth) acrylate compound (EA) having carboxyl group Although it does not specifically limit as an epoxy (meth) acrylate compound which has a carboxyl group in this embodiment, It is obtained by making the reaction product of an epoxy compound and unsaturated group containing monocarboxylic acid react with an acid anhydride. Epoxy (meth) acrylate compounds are suitable.
- a bisphenol A type epoxy compound, a bisphenol F type epoxy compound, a bisphenol S type epoxy compound, a phenol novolak type epoxy compound, a biphenyl type epoxy compound, a cresol novolak type epoxy compound, or An epoxy compound such as an aliphatic epoxy compound may be mentioned. These may be used alone or in combinations of two or more. Among them, it is preferable to use a bisphenol F type epoxy compound from the viewpoint of flexibility, and it is preferable to use a biphenyl type epoxy compound from the viewpoint of insulation.
- unsaturated group-containing monocarboxylic acids examples include acrylic acid, dimers of acrylic acid, methacrylic acid, ⁇ -furfurylacrylic acid, ⁇ -styrylacrylic acid, cinnamic acid, crotonic acid, ⁇ -cyanocinnamic acid, etc. Is mentioned.
- a reaction product of a hydroxyl group-containing acrylate and a saturated or unsaturated dibasic acid anhydride and a reaction product of an unsaturated group-containing monoglycidyl ether and a saturated or unsaturated dibasic acid anhydride are also included.
- These unsaturated group-containing monocarboxylic acids can be used alone or in combination of two or more.
- Acid anhydrides include maleic anhydride, succinic anhydride, itaconic anhydride, phthalic anhydride, tetrahydrophthalic anhydride, hexahydrophthalic anhydride, methylhexahydrophthalic anhydride, endomethylenetetrahydrophthalic anhydride, methylendo Dibasic acid anhydrides such as methylenetetrahydrophthalic acid, chlorendic anhydride, and methyltetrahydrophthalic anhydride, aromatic polycarboxylic acid anhydrides such as trimellitic anhydride, pyromellitic anhydride, and benzophenonetetracarboxylic dianhydride 5- (2,5-dioxotetrahydrofuryl) -3-methyl-3-cyclohexene-1,2-dicarboxylic anhydride, endobicyclo- [2,2,1] -hept-5-ene-2, And polyvalent carboxylic acid anhydride derivatives such as 3-dica
- the molecular weight of the epoxy (meth) acrylate compound having a carboxyl group thus obtained is not particularly limited, but the weight average molecular weight is preferably 5000 to 15000, more preferably 8000 to 12000.
- the weight average molecular weight is a value in terms of polystyrene measured by gel permeation chromatography.
- the acid value (solid acid value) of the epoxy (meth) acrylate compound is preferably in the range of 30 to 150 mgKOH / g, and preferably 40 to 100 mgKOH from the viewpoint of the balance between developability and flexibility after curing.
- the range of / g is more preferable.
- the solid content acid value is a value measured according to JIS K0070.
- the epoxy (meth) acrylate compound having a carboxyl group may constitute a photosensitive prepolymer alone, but may be used in combination with a urethane (meth) acrylate compound having a carboxyl group described later. In that case, it is preferable to use the epoxy (meth) acrylate compound having a carboxyl group in a range of 100 parts by mass or less with respect to 100 parts by mass of the urethane (meth) acrylate compound having a carboxyl group.
- the urethane (meth) acrylate compound having a carboxyl group in the present embodiment is a compound including, as constituent units, a (meth) acrylate-derived unit having a hydroxyl group, a polyol-derived unit, and a polyisocyanate-derived unit. More specifically, both terminals are composed of (meth) acrylate-derived units having hydroxyl groups, and the terminals are composed of repeating units composed of polyol-derived units and polyisocyanate-derived units linked by urethane bonds. In this structure, a carboxyl group is present in the repeating unit.
- the urethane (meth) acrylate compound having a carboxyl group is represented by the following formula. -(OR 11 O-CONHR 12 NHCO) n- [Wherein n is an integer of 1 to 200, OR 11 O represents a dehydrogenated residue of polyol, and R 12 represents a deisocyanate residue of polyisocyanate. ]
- the urethane (meth) acrylate compound having a carboxyl group can be produced by reacting at least a (meth) acrylate having a hydroxyl group, a polyol, and a polyisocyanate.
- at least one of a polyol and a polyisocyanate is used.
- a polyol having a carboxyl group is used.
- the urethane (meth) acrylate compound in which a carboxyl group is present in R 3 or R 4 can be produced by using a compound having a carboxyl group as the polyol and / or polyisocyanate.
- n is preferably about 1 to 200, and more preferably 2 to 30. When n is in such a range, the flexibility of the cured film made of the photosensitive resin composition is more excellent.
- the repeating unit represents a plurality of types, but the regularity of the plurality of units is completely random, block, localized, etc. It can be selected accordingly.
- Examples of the (meth) acrylate having a hydroxyl group used in the present embodiment include ethanediol monoacrylate, propanediol monoacrylate, 1,3-propanediol monoacrylate, 1,4-butanediol monoacrylate, 1,6 -Hexanediol monoacrylate, 1,9-nonanediol monoacrylate, diethylene glycol monoacrylate, triethylene glycol monoacrylate, dipropylene glycol monoacrylate, 2,3-dihydroxypropyl acrylate, 3- (4-benzoyl-3 methacrylate) -Hydroxyphenoxy) -2-hydroxypropyl, 2,3-dihydroxypropyl 2-methylpropenoate, 2-hydroxyethyl (meth) acrylate, hydroxypropyl (Meth) acrylate, hydroxybutyl (meth) acrylate, caprolactone or alkylene oxide adduct of each of the above (meth) acrylates
- a polymer polyol and / or a dihydroxyl compound can be used.
- the polymer polyol units derived from polyether diols such as polyethylene glycol, polypropylene glycol, polytetramethylene glycol, polyester polyols obtained from esters of polyhydric alcohols and polybasic acids, hexamethylene carbonate, pentamethylene carbonate, etc.
- polylactone diols such as polycarbonate diol, polycaprolactone diol, and polybutyrolactone diol.
- a polymer polyol having a carboxyl group for example, a compound synthesized such that a tribasic or higher polybasic acid such as (anhydrous) trimellitic acid coexists in the synthesis of the polymer polyol so that the carboxyl group remains. Etc. can be used.
- the polymer polyol can be used alone or in combination of two or more thereof.
- a polymer polyol having a weight average molecular weight of 200 to 2000 because the flexibility of a cured film made of the photosensitive resin composition is more excellent.
- use of polycarbonate diol is preferable because the cured film made of the photosensitive resin composition has high heat resistance and excellent pressure cooker resistance.
- the constituent unit of the polymer polyol is not only from a single constituent unit but also from a plurality of constituent units because the flexibility of the cured film made of the photosensitive resin composition is further improved.
- polymer polyol composed of a plurality of structural units, a polyether diol containing units derived from ethylene glycol and propylene glycol as structural units, a polycarbonate containing units derived from hexamethylene carbonate and pentamethylene carbonate as structural units Examples include diols.
- the dihydroxyl compound a branched or linear compound having two alcoholic hydroxyl groups can be used, and it is particularly preferable to use a dihydroxy aliphatic carboxylic acid having a carboxyl group.
- a dihydroxyl compound include dimethylolpropionic acid and dimethylolbutanoic acid.
- the carboxyl group can be easily present in the urethane (meth) acrylate compound.
- the dihydroxyl compound can be used alone or in combination of two or more, and may be used together with a polymer polyol.
- polyisocyanate used in this embodiment examples include 2,4-toluene diisocyanate, 2,6-toluene diisocyanate, isophorone diisocyanate, hexamethylene diisocyanate, diphenylmethylene diisocyanate, (o, m or p) -xylene diisocyanate, Examples thereof include diisocyanates such as methylene bis (cyclohexyl isocyanate), trimethylhexamethylene diisocyanate, cyclohexane-1,3-dimethylene diisocyanate, cyclohexane-1,4-dimethylene diisocyanate, and 1,5-naphthalene diisocyanate. These polyisocyanates can be used alone or in combination of two or more. Moreover, the polyisocyanate which has a carboxyl group can also be used.
- the molecular weight of the urethane (meth) acrylate compound having a carboxyl group used in the present embodiment is not particularly limited, but the weight average molecular weight (Mw) is preferably 1000 to 30000, more preferably 8000 to 20000.
- Mw weight average molecular weight
- the weight average molecular weight of the urethane (meth) acrylate compound having a carboxyl group is 1000 or more, the elongation and strength of the cured film made of the photosensitive resin composition are good, and when it is 30000 or less, the flexibility is good. .
- the acid value of the urethane (meth) acrylate is preferably 30 to 80 mgKOH / g, more preferably 40 to 60 mgKOH / g.
- the acid value is 30 mgKOH / g or more, the alkali solubility of the photosensitive resin composition is good, and when it is 80 mgKOH / g or less, the flexibility of the cured film is good.
- the acid value of the urethane (meth) acrylate compound having a carboxyl group is preferably 30 to 80 mgKOH / g, but if the acid value is increased within this range, the developability is improved, but the flexibility tends to decrease. If the acid value is lowered, the flexibility becomes higher, but the developability tends to decrease and the development residue tends to occur. In that case, a photosensitive resin composition having excellent flexibility and good developability can be obtained by using a combination of urethane (meth) acrylate compounds having carboxyl groups having different acid values. It can be easily obtained.
- the urethane (meth) acrylate compound having a carboxyl group is (1) a method in which a (meth) acrylate having a hydroxyl group, a polyol, and a polyisocyanate are mixed and reacted, and (2) a reaction between the polyol and the polyisocyanate.
- a method in which a urethane isocyanate prepolymer containing one or more isocyanate groups per molecule is produced and then this urethane isocyanate prepolymer is reacted with a (meth) acrylate having a hydroxyl group, (3) having a hydroxyl group (meta )
- a urethane isocyanate prepolymer containing one or more isocyanate groups per molecule After reacting an acrylate with a polyisocyanate to produce a urethane isocyanate prepolymer containing one or more isocyanate groups per molecule, it can be produced by a method of reacting this prepolymer with a polyol. Kill.
- the photopolymerization initiator is not particularly limited, and any conventionally known photopolymerization initiator can be used. Specific examples include bis (2,4,6 trimethylbenzoyl) -phenylphosphine oxide, 2,4,6-trimethylbenzoyldiphenylphosphine oxide, 1,2-octanedione, 1- [4- (phenylthio) phenyl-, 2- (O-benzoyloxime)], ethanone, 1- [9-ethyl-6- (2-methylbenzoyl) -9H-carbazol-3-yl]-, 1- ( O-acetyloxime), 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butanone-1,2- (dimethylamino) -2-[(4-methylphenyl) methyl] -1- [4- (4-morpholinyl) phenyl] -1-butanone, benzoin, benzo
- the amount of the photopolymerization initiator used is preferably 2 parts by mass or more, more preferably 6 parts by mass or more, still more preferably 10 parts by mass or more, relative to 100 parts by mass of the photosensitive prepolymer. 20 parts by mass or less, more preferably 16 parts by mass or less, and still more preferably 14 parts by mass or less.
- the photocurable reaction of the photosensitive prepolymer easily proceeds, and when it is 20 parts by mass or less, The curing reaction can be performed without causing weakening of the cured film or impairing the adhesion.
- thermosetting agent used in the present embodiment is a polycarbodiimide compound containing a carbodiimide group that can react with the carboxyl group of the photosensitive prepolymer.
- the polycarbodiimide compound of this embodiment is characterized in that the carbodiimide group in the structure is protected by an amino group that dissociates at a temperature of 80 ° C. or higher. “Protected” means that the carbodiimide group and the amino group are covalently bonded, but are bonded to such an extent that they are dissociated by heat.
- the carbodiimide group (—N ⁇ C ⁇ N) is highly reactive with a carboxyl group, and the reaction starts at the moment of mixing with the photosensitive prepolymer having a carboxyl group, so that the storage stability of the composition is poor. It is not suitable for a dry resist film formed into a film at a temperature of less than 80 ° C., and polycarbodiimide has not been used in conventional photosensitive resin compositions. That is, since the polycarbodiimide cannot be present in the photosensitive resin composition as it is, a carbodiimide compound in which the carbodiimide group is protected with an amino group is used in the present invention.
- the film is formed by heating at a temperature of less than 80 ° C., and thermocompression treatment such as thermal lamination is performed at a temperature of less than 80 ° C., the amino group is not dissociated from the carbodiimide group. However, it is thought that it can be developed with high accuracy. Furthermore, since the photosensitive resin composition of the present invention has appropriate fluidity during the thermocompression treatment, it can be suitably embedded in an FPC pattern circuit. After this, development processing is performed to form an opening at a predetermined position. Thereafter, heating at a temperature of 80 ° C.
- the carbodiimide group reacts with the carboxyl group, and the photosensitive resin composition is completely cured (C stage).
- C stage a structure called acyl urea is formed by the reaction of the carbodiimide group and the carboxyl group.
- the amino group is not particularly limited as long as it can be dissociated from the carbodiimide group at a temperature of 80 ° C. or higher, and any of primary to tertiary can be used. Especially, it is preferable to use the primary amino group and secondary amino group which have active hydrogen from a viewpoint of the stability improvement after couple
- the polycarbodiimide compound of the present embodiment is a compound represented by the following formula (1).
- R 1 and R 2 are each independently a hydrogen atom, a linear or branched alkyl group having 1 to 6 carbon atoms, or a cycloalkyl group having 3 to 6 carbon atoms; 1 and R 2 may be the same as or different from each other, but they are not hydrogen atoms, X 1 and X 2 each represent —R 3 —NH—COOR 4 , and R 3 is at least 1 A divalent organic group having one aromatic group, R 4 is a residue obtained by removing a hydroxyl group from an organic group having one hydroxyl group, and X 1 and X 2 may be the same or different from each other; Y represents —R 5 —NHCOO—R 6 —OCOHN—R 5 —, each R 5 independently represents a divalent organic group having at least one aromatic group, and R 6 represents a divalent organic group. Where R 6 is not an ether bond, and n is an integer of 1 to 5. Represents a number.
- R 1 and R 2 are each independently a hydrogen atom, a linear or branched alkyl group having 1 to 6 carbon atoms or a cycloalkyl group having 3 to 6 carbon atoms.
- R 1 and R 2 linked to the same nitrogen atom may be the same or different from each other, but they are not both hydrogen atoms.
- Examples of the linear or branched alkyl group having 1 to 6 carbon atoms include methyl group, ethyl group, propyl group, isopropyl group, n-butyl group, sec-butyl group, isobutyl group, tert-butyl group, and pentyl.
- a cycloalkyl group having 3 to 6 carbon atoms includes, for example, a cyclopropyl group, a cyclobutyl group, a cyclopentyl group, a cyclohexyl group, and the like.
- R 1 and R 2 are each independently more preferably a linear or branched alkyl group having 1 to 6 carbon atoms or a cycloalkyl group having 3 to 6 carbon atoms, an ethyl group, More preferred are a methyl group, a propyl group, and an isopropyl group. Among them, it is particularly preferable that both R 1 and R 2 are propyl groups or isopropyl groups, and it is most preferable that both are isopropyl groups.
- the carbodiimide group of polycarbodiimide has a structure protected with an amine.
- the protecting amine has a crosslinking reaction from the viewpoint of compatibility with other components. It is preferably protected with a secondary amine which is difficult.
- secondary amines include dimethylamine, N-ethylmethylamine, N-ethylpropylamine, N-methylbutylamine, N-methylpentylamine, N-hexylamine, N-methylcyclohexylamine, diethylamine, N- Ethylpropylamine, N-ethylbutylamine, N-ethylpentylamine, N-ethylhexylamine, diisopropylamine, N-propylbutylamine, N-propylpentylamine, N-propylhexylamine, di-sec-butylamine, di-n- Examples include butylamine and diisobutylamine.
- the amine used in the present embodiment those having a boiling point of 160 ° C. or less can be suitably used.
- the reaction with the carboxyl group at room temperature can be suppressed, and the carbodiimide group can be dissociated in the temperature range of 80 to 200 ° C.
- the amine used preferably has a boiling point of 50 to 140 ° C., more preferably 80 to 110 ° C. When the boiling point is 80 to 110 ° C., the amine can be dissociated by heat treatment at 100 to 160 ° C.
- X 1 and X 2 are each —R 3 —NH—COOR 4 .
- R 3 is a divalent organic group having at least one aromatic group
- R 4 is a residue obtained by removing a hydroxyl group from an organic group having one hydroxyl group
- X 1 and X 2 are the same as each other Or different.
- Examples of the divalent organic group having at least one aromatic group for R 3 include a divalent residue of an aromatic diisocyanate having at least one aromatic group.
- aromatic diisocyanates include 4,4′-diphenylmethane diisocyanate, 4,4′-diphenyl ether diisocyanate, p-phenylene diisocyanate, m-phenylene diisocyanate, 3,3′-dimethoxy-4,4′-biphenyl diisocyanate, o -Tolidine diisocyanate, naphthylene diisocyanate, 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, 3,3'-dimethoxy-4,4'-diphenylmethane diisocyanate, 3,3'-dimethyl-4,4 ' -Diphenyl ether diisocyanate and the like.
- the reactivity of the hydroxyl group of the organic group having one hydroxyl group with an isocyanate group other than the hydroxyl group is not inhibited. If it is the residue of the organic group which does not have, it will not specifically limit.
- the organic group having no reactivity with an isocyanate group other than a hydroxyl group include, for example, a hydroxyalkyl group such as a hydroxymethyl group, a hydroxyethyl group, a hydroxypropyl group, and a hydroxybutyl group, a hydroxy ester group, a hydroxy ether group, and a hydroxy alkylene group.
- R 4 is preferably a residue obtained by removing a hydroxyl group from a hydroxyalkyl group, and more preferably a methyl group or an ethyl group.
- Y is —R 5 —NHCOO—R 6 —OCOHN—R 5 —.
- each R 5 is independently a divalent organic group having at least one aromatic group
- R 6 is a divalent organic group.
- R 6 is not an ether bond.
- Examples of the divalent organic group having at least one aromatic group of R 5 include divalent residues of aromatic diisocyanates having at least one aromatic group, as described above for R 3. The same applies to examples and preferred examples.
- Examples of the divalent organic group represented by R 6 include an ester bond, a carbonate group, and a conjugated diene structure.
- R 6 does not become an ether bond. Since the ether bond is hydrophilic, the desired effect of the present invention, in particular, the migration resistance cannot be improved.
- divalent organic group represented by R 6 include a divalent residue of a diol compound.
- diol compound include low molecular diols or polyalkylene diols, polycarbonate diols, castor oil-based diols, and polyester diols.
- the low molecular diol or polyalkylene diol is a compound having two hydroxyl groups in one molecule.
- Examples of the polycarbonate diol include a reaction product of a diol and a carbonate ester.
- the carbonate ester in producing the polycarbonate diol include dialkyl carbonates such as dimethyl carbonate, diethyl carbonate, dipropyl carbonate, and dibutyl carbonate; Diaryl carbonates; alkylene carbonates such as ethylene carbonate, trimethylene carbonate, 1,2-propylene carbonate, 1,2-butylene carbonate, 1,3-butylene carbonate, 1,2-pentylene carbonate, and the like.
- the castor oil-based diol includes, for example, castor oil fatty acid ester-based diols.
- castor oil the above-described low molecular diol or diether polyol and castor oil are transesterified or esterified with castor oil fatty acid.
- examples include castor oil fatty acid ester obtained by the reaction.
- polyester diol examples include polycarboxylic acids [aliphatic saturated or unsaturated polycarboxylic acids (adipic acid, azelaic acid, dodecanoic acid, maleic acid, fumaric acid, itaconic acid, dimerized linoleic acid, etc.) and / or aromatics.
- polycarboxylic acids aliphatic saturated or unsaturated polycarboxylic acids (adipic acid, azelaic acid, dodecanoic acid, maleic acid, fumaric acid, itaconic acid, dimerized linoleic acid, etc.
- a catalyst organic metal compound, metal chelate compound, fatty acid metal acylated product, etc.
- Polymerized polyol eg, polycaprolactone diol
- carboxy at the end examples include polycarbonate polyols obtained by addition polymerization of alkylene oxide (ethylene oxide, propylene oxide, etc.) to a polyester having a xyl group and / or an OH group.
- divalent organic groups of R 6 are castor oil-based diol residues (residues obtained by removing two hydroxyl groups from a castor oil-based structure), low molecular diol residues, polyalkylenes from the viewpoint of improving migration resistance.
- n is an integer of 1 to 5.
- the number of functional groups of the carbodiimide of the polycarbodiimide compound is preferably bifunctional or more in terms of obtaining a cross-linked product. Therefore, the above effect can be achieved when n is 1 or more. .
- the number of functional groups of carbodiimide is 2 to 6 and the number of functional groups of carbodiimide is preferably 2 to 5 from the viewpoint of making it difficult for the photosensitive resin composition to warp during curing.
- R 1 and R 2 are both isopropyl groups
- X 1 and X 2 each represent —R 3 —NH—COOR 4 and R 3 Is a divalent residue of 4,4′-diphenylmethane diisocyanate, 2,4-tolylene diisocyanate or 2,6-tolylene diisocyanate
- R 4 is a residue obtained by removing a hydroxyl group from a hydroxymethyl group or a hydroxyethyl group
- X 1 and X 2 may be the same or different from each other
- Y represents —R 5 —NHCOO—R 6 —OCOHN—R 5 —
- each R 5 independently represents 4,4 ′.
- R 6 is castor oil-based All residues, propanediol residues, butanediol residues, a polycarbonate diol residue, n is an integer of 1-5.
- the preferred polycarbodiimide compound is also referred to as “polycarbodiimide compound group A”.
- the polycarbodiimide compound has a weight average molecular weight of 300 to 3,000.
- the weight average molecular weight of the polycarbodiimide compound is 300 or more, warpage hardly occurs when the photosensitive resin composition is cured, and when it is 3000 or less, the development time can be shortened.
- the weight average molecular weight of the polycarbodiimide compound is preferably in the range of 300 to 1200 from the viewpoint of migration resistance.
- the weight average molecular weight is a value measured by gel permeation chromatography using polystyrene conversion.
- the equivalent number of carbodiimides in the polycarbodiimide compound is 150 to 600.
- cured material can be reduced as the equivalent number of carbodiimide is 150 or more.
- the desired crosslinking density is obtained as the equivalent number of carbodiimide is 600 or less, the migration resistance can be maintained.
- the number of equivalents of carbodiimide is preferably 400 or less, and more preferably 300 or less, in order to obtain better migration resistance.
- a carbodiimide monomer containing at least two isocyanate groups in one molecule and a polyol having a hydroxyl group at the molecular end are reacted to obtain polycarbodiimide.
- the polycarbodiimide is reacted with a hydroxyl group-containing monomer to seal the terminal isocyanate group of the polycarbodiimide, and the end-capped polycarbodiimide is reacted with an amine to protect the carbodiimide group with an amino group.
- Polycarbodiimide can be obtained by a known method, for example, by a method disclosed in Japanese Patent Application Laid-Open No. 2007-138080.
- the amount of the polycarbodiimide compound used is preferably such that the carbodiimide equivalent of the polycarbodiimide compound is 0.9 to 1.3 equivalents relative to the carboxyl group of the photosensitive prepolymer.
- the carbodiimide equivalent is 0.9 or more with respect to the carboxyl group equivalent 1
- the migration resistance can be sufficiently enhanced and the storage stability of the dry film can be improved.
- the storage stability of a dry film can be maintained as the carbodiimide equivalent is 1.3 or less with respect to the carboxyl group equivalent 1.
- the carbodiimide equivalent is more preferably 1.0 or more, and more preferably 1.2 or less.
- a photopolymerizable compound may be contained in the photosensitive resin composition.
- An example of the photopolymerizable compound of this component in this embodiment is not particularly limited as long as it can be photocrosslinked, but a compound having an ethylenically unsaturated bond is preferably used.
- (meth) acrylate compound As a compound having an ethylenically unsaturated bond in the molecule, (meth) acrylate compound, bisphenol A di (meth) acrylate compound, epoxy acrylate compound, modified epoxy acrylate compound, fatty acid modified epoxy acrylate compound, amine modified bisphenol A type Epoxy acrylate compounds, hydrogenated bisphenol A-based di (meth) acrylate compounds, di (meth) acrylate compounds having a urethane bond in the molecule, (meth) acrylate compounds having a hydrophobic skeleton in the molecule, (poly) in the molecule Examples include polyalkylene glycol di (meth) acrylate compounds having both oxyethylene chains and (poly) oxypropylene chains, trimethylolpropane di (meth) acrylate compounds, and polyester acrylate compounds. That. These can be used alone or in combination of two or more.
- photopolymerizable compound preferably used in the present embodiment for example, “EBECRYL-3708”, “EBECRYL-1039” (both trade names, manufactured by Daicel Ornex Co., Ltd.), “ R-684 ",” HX-220 “,” HX-620 “(all trade names, manufactured by Nippon Kayaku Co., Ltd.) and the like are exemplified.
- the amount of the photopolymerizable compound used is preferably 10 parts by mass or more, more preferably 20 parts by mass or more, still more preferably 30 parts by mass or more, relative to 100 parts by mass of the photosensitive prepolymer.
- the amount is preferably 60 parts by mass or less, more preferably 50 parts by mass or less, and still more preferably 40 parts by mass or less.
- the content of the photopolymerizable compound is 10 parts by mass or more with respect to 100 parts by mass of the photosensitive prepolymer, it is possible to improve the resolution when manufacturing the FPC, and thus a fine circuit pattern can be drawn.
- the photosensitive resin composition of the present invention may further contain a colorant. By containing the colorant, the shape and resolution of the pattern circuit can be controlled.
- Examples of the colorant used in the present embodiment include organic pigments and inorganic pigments.
- organic pigments include organic pigments such as phthalocyanine, quinacridone, benzimidazolone, dioxazine, indanthrene, perylene, azo, quinophthalone, anthraquinone, aniline, and cyanine.
- inorganic pigments include carbon black, titanium black, ultramarine blue, prussian blue, yellow lead, zinc yellow, red lead, iron oxide red, zinc white, lead white, lithopone, and titanium dioxide. These may be used individually by 1 type and may be used in combination of 2 or more type. Among these, it is preferable to use an organic pigment from the viewpoint of insulation.
- a black pigment as a colorant.
- the black pigment include titanium black, carbon black, carbon nanotube, acetylene black, aniline black, perylene black, strontium titanate, chromium oxide, and cerium oxide.
- the colorant is preferably used as a dispersion.
- This dispersion can be prepared by adding and dispersing a composition obtained by previously mixing a colorant and a dispersant in an organic solvent (or vehicle).
- the vehicle refers to a portion of a medium in which a pigment is dispersed when the paint is in a liquid state, and is a liquid portion that binds to the pigment and hardens the coating film (binder), and a component that dissolves and dilutes the portion. (Organic solvent).
- the colorant used in this embodiment preferably has a number average particle diameter of 0.001 to 0.1 ⁇ m, more preferably 0.01 to 0.08 ⁇ m, from the viewpoint of dispersion stability.
- the “particle size” here means the diameter when the electron micrograph image of the particle is a circle of the same area, and the “number average particle size” is the above-mentioned particle size for many particles, This 100 average value is said.
- the amount of the colorant used is preferably 0.2 to 3 parts by mass, more preferably 0.5 to 2 parts by mass, based on 100 parts by mass of the photosensitive prepolymer.
- the black pigment content in the production of the black solder resist film is preferably 1 to 10 parts by mass in terms of solid content with respect to 100 parts by mass of the photosensitive prepolymer, and 3 to 7 parts by mass. More preferred. If the content of the colorant is too small, there is a tendency that a desired shape cannot be drawn due to scattering of exposure light during pattern formation (or patterning), and if it is too much, the bottom of the film is exposed during photocuring. Since the light does not reach, an uncured portion is generated inside the film, and erosion of the cured film occurs during etching, resulting in poor pattern formation.
- the photosensitive resin composition of the present invention can contain other components as long as the desired effects of the present invention are not hindered.
- a flame retardant, a plasticizer, a filler, etc. can be contained, for example.
- the flame retardant include organic phosphinic acid flame retardants, metal oxides, phosphate esters, phosphazene compounds, melamine, thermal condensates thereof, salts of polyphosphoric acid, melamine and isocyanuric acid compounds, and the like.
- the plasticizer include p-toluenesulfonamide.
- the filler include silica, alumina, talc, calcium carbonate, barium sulfate and the like. These components may be used individually by 1 type, and may be used in combination of 2 or more type.
- the amount of these components used is preferably 5 to 60 parts by mass, more preferably 20 to 40 parts by mass with respect to 100 parts by mass of the photosensitive prepolymer.
- the production method of the photosensitive resin composition of the present invention can be produced according to a conventionally known method, and is not particularly limited. For example, it can be produced by sequentially mixing a photopolymerization initiator, a thermosetting agent and other optional components into the photosensitive prepolymer. The mixing step can be performed using a mixer such as a bead mill or a roll mill.
- the photosensitive resin composition of the present invention may be liquid or film-like.
- the film-like photosensitive resin composition is obtained, for example, by applying the photosensitive resin composition of the present invention on a film subjected to a release treatment and removing the solvent contained in the resin composition at a predetermined temperature. Can be formed.
- the coating method can be appropriately selected according to the desired thickness, such as a comma coater, a gravure coater, or a die coater.
- the photosensitive film of this invention is equipped with the support body and the photosensitive resin composition layer formed on this support body, and the photosensitive resin composition layer contains the said photosensitive resin composition.
- the photosensitive film may have a protective film layer on the surface opposite to the support of the photosensitive resin composition layer. According to the photosensitive film which concerns on this embodiment, it is excellent in flexibility, and after hardening the said photosensitive film, a soldering resist film can be formed easily.
- the photosensitive resin composition layer is obtained by mixing the photosensitive resin composition of the present invention with a solvent such as methanol, ethanol, acetone, methyl ethyl ketone, methyl cellosolve, ethyl cellosolve, toluene, N, N-dimethylformamide, propylene glycol monomethyl ether, or the like. It is preferable to form a solution having a solid content of about 30 to 70% by mass, and then coating the solution on a support.
- a solvent such as methanol, ethanol, acetone, methyl ethyl ketone, methyl cellosolve, ethyl cellosolve, toluene, N, N-dimethylformamide, propylene glycol monomethyl ether, or the like. It is preferable to form a solution having a solid content of about 30 to 70% by mass, and then coating the solution on a support.
- the support examples include polymer films having heat resistance and solvent resistance such as polyester such as polyethylene terephthalate, polypropylene, and polyethylene. It is preferable that the surface of the support to which the resin composition is applied is subjected to a release treatment.
- the thickness of a support body can be suitably selected from a use and the thickness of the said resin composition.
- the thickness of the photosensitive resin composition layer varies depending on the use, but is preferably 5 to 100 ⁇ m, more preferably 10 to 50 ⁇ m, after drying after removing the solvent by heating and / or hot air blowing.
- Examples of the protective film include polyethylene film, polypropylene film, and polyethylene terephthalate.
- the photosensitive film of the present invention can be stored as it is and has a storage stability of about 2 weeks or more at room temperature (23 ° C.).
- the photosensitive film of the present invention can be used for forming a resist pattern.
- the resist pattern is formed by laminating a photosensitive film on a circuit-forming substrate and irradiating a predetermined portion of the photosensitive resin composition layer with actinic rays to form a cured portion in the photosensitive resin composition layer.
- a photosensitive film has a protective film, it has the process of removing a protective film from a photosensitive film.
- the circuit forming substrate is composed of an insulating layer and a conductor layer formed on the insulating layer by an etching method or a printing method (copper, copper alloy, silver, silver alloy, nickel, chromium, iron, stainless steel, etc.)
- the photosensitive resin composition layer of the photosensitive film is formed on the conductor layer side of the circuit forming substrate. Laminate to be laminated.
- Examples of the method of laminating the photosensitive film in the laminating step include a method of laminating by pressing the photosensitive resin composition layer on the circuit forming substrate while heating. When laminating in this way, it is preferable to laminate under reduced pressure from the standpoint of adhesion and followability.
- the photosensitive resin composition layer is preferably heated at a temperature of 30 ° C. or higher and lower than 80 ° C., the pressure of pressure bonding is preferably about 0.1 to 2.0 MPa, and the ambient pressure is 3 hPa. The following is preferable.
- the heating temperature is 80 ° C. or higher, the amino group of the polycarbodiimide compound in the photosensitive resin composition is dissociated from the carboxyl group, and thus the lamination process is performed at a temperature lower than the dissociation temperature.
- a predetermined portion of the photosensitive resin composition layer is irradiated with actinic rays to form a cured portion.
- the method for forming the cured portion include a method in which an actinic ray is irradiated in an image form through a negative or positive mask pattern called an artwork. Further, exposure by a direct drawing method having no mask pattern such as an LDI (Laser Direct Imaging) method or a DLP (Digital Light Processing) (registered trademark) exposure method is also possible.
- an actinic ray can be irradiated as it is.
- the photosensitive resin composition layer is irradiated with actinic rays after the support is removed.
- a known light source such as a carbon arc lamp, a mercury vapor arc lamp, an ultrahigh pressure mercury lamp, a high pressure mercury lamp, a xenon lamp, a semiconductor laser, or the like can be used.
- a light source that effectively emits visible light such as a photographic flood bulb or a solar lamp, can be used.
- the photosensitive resin composition layer other than the cured portion is formed by wet development, dry development, or the like. Removal and development are performed to form a resist pattern.
- development can be performed using a developing solution such as an alkaline aqueous solution by a known method such as spraying, rocking immersion, brushing, or scraping.
- a developing solution such as an alkaline aqueous solution by a known method such as spraying, rocking immersion, brushing, or scraping.
- the developer is preferably safe and stable and has good operability.
- a dilute solution of sodium carbonate (1 to 5% by mass aqueous solution) at 20 to 50 ° C. is used.
- a heat curing step is performed after the development step.
- the amino group of the polycarbodiimide compound in the photosensitive resin composition of the photosensitive resin composition layer is dissociated, and a cured film can be formed.
- the heating method may include heating with an oven.
- the heating condition is preferably 20 to 120 minutes at a temperature of 80 ° C. or higher. Since the amino group of the polycarbodiimide compound is dissociated at 80 ° C. or higher, the amino group can be dissociated from the carbodiimide group by heating at 80 ° C. or higher, and reacted with the carboxyl group of the photosensitive prepolymer to be cured. it can.
- limiting in particular as an upper limit of heating temperature For example, performing at 200 degrees C or less is preferable from a viewpoint of work efficiency.
- a flexible printed wiring board in which a wiring pattern and a solder resist layer are formed in this order on an insulating layer is obtained, and a structure called acyl urea is formed by a reaction between a carbodiimide group and a carboxyl group. Formed inside.
- the FPC may further include a shield layer containing a conductive material on the solder resist layer.
- the shield layer examples include those having a three-layer structure of insulating layer / metal layer / conductive adhesive layer, and a commercially available shield film can be used.
- a metal is mentioned as an electroconductive material which comprises a shield layer. Examples of the metal include gold, silver, copper, aluminum, nickel, and alloys thereof.
- the conductive adhesive layer is provided in contact with the solder resist layer.
- a flexible printed wiring board is prepared by providing a solder resist layer so that the interlayer distance between the wiring pattern and the shield layer is 10 ⁇ m after curing, and the flexible printed wiring board has a temperature of 85 ° C.
- the electrical insulation characteristics of the flexible printed wiring board should have a resistance value of 1.0 ⁇ 10 7 ⁇ or more for 500 hours or more, and preferably the resistance value has a duration of 1000 hours or more.
- the solder resist has extremely excellent migration resistance in practical use.
- the image display apparatus of this invention is equipped with the flexible printed wiring board (FPC) of this invention.
- An image display device according to the present invention electrically connects, for example, a liquid crystal display substrate having a liquid crystal display portion on a surface thereof in a liquid crystal panel display, a printed circuit board provided with a driving circuit for the liquid crystal display substrate, and the liquid crystal display substrate and the printed circuit board.
- a flexible printed wiring board (FPC) for connection to the FPC is used, and the flexible printed wiring board of the present invention is used as the FPC.
- a liquid crystal display substrate encloses liquid crystal for forming a display region composed of a large number of pixel arrays between two insulating substrates based on glass, and one surface forms a liquid crystal display unit. ing.
- the printed board is a so-called control board on which a control IC for driving and controlling the touch sensor module is mounted.
- the flexible printed wiring board (FPC) of the present invention has one end bonded to the liquid crystal display substrate and the other end bonded to the printed circuit board, and the liquid crystal display substrate and the printed circuit board are electrically connected by the FPC of the present invention.
- the vacuum lamination was performed at a hot plate temperature of 50 to 60 ° C., a pressing pressure of 0.5 to 1.0 MPa, a pressing time of 10 to 20 seconds, and a degree of vacuum of 3 hPa or less.
- ultraviolet rays of 200 mJ / cm 2 were irradiated with an ultra high pressure mercury lamp.
- the PET film was peeled off and developed with a 1 wt% sodium carbonate aqueous solution at 30 ° C. at a spray pressure of 0.18 MPa for 60 seconds.
- ultraviolet rays of 1,000 mJ / cm 2 were irradiated with a high pressure mercury lamp.
- an electromagnetic wave shielding film (“SF-PC8600 / -C” manufactured by Tatsuta Electric Cable Co., Ltd.) was bonded to the upper part of the dry film by a hot press to prepare a test specimen.
- the hot press conditions were as follows: hot plate temperature 180 ° C., press pressure 2.94 MPa, press time 60 minutes.
- the interlayer distance between the circuit pattern and the electromagnetic wave shielding film was 10 ⁇ m.
- ⁇ The resistance value decreased to less than 1.0 ⁇ 10 7 ⁇ after 500 hours or more and less than 1000 hours.
- ⁇ Resistance value decreased to less than 1.0 ⁇ 10 7 ⁇ in 250 hours or more and less than 500 hours.
- X The resistance value decreased to less than 1.0 ⁇ 10 7 ⁇ in less than 250 hours.
- ⁇ Storage stability test> (1) Preparation of test specimen The 25 ⁇ m-thick dry film prepared in (ii) above was stored in the dark at 23 ° C. The polyethylene film of the dry film stored for the predetermined period shown in the following evaluation criteria was peeled off, and a test specimen was prepared by bonding to a rolled copper foil having a thickness of 35 ⁇ m by vacuum lamination. The vacuum lamination was performed at a hot plate temperature of 50 to 60 ° C., a pressing pressure of 0.5 to 1.0 MPa, a pressing time of 10 to 20 seconds, and a degree of vacuum of 3 hPa or less.
- UV rays of 200 mJ / cm 2 were irradiated with an ultrahigh pressure mercury lamp through a photomask on which a predetermined pattern ( ⁇ 100 ⁇ m) was formed. After the irradiation, the PET film was peeled off, and the dry film was developed with a 1 wt% sodium carbonate aqueous solution at 30 ° C. for 60 to 120 seconds at a spray pressure of 0.18 MPa. The resolution was evaluated according to the following criteria. ⁇ Evaluation criteria ⁇ A: Resolution of ⁇ 100 ⁇ m is obtained even after storage at 23 ° C. for 4 weeks or more, and there is no development residue.
- ⁇ Resolution of ⁇ 100 ⁇ m was obtained after storage at 23 ° C./3 weeks or more.
- ⁇ Resolution of ⁇ 100 ⁇ m was obtained after storage at 23 ° C./2 weeks or more.
- X Resolution of ⁇ 100 ⁇ m could not be obtained after storage at 23 ° C./2 weeks or less.
- the PET film was peeled off and developed with a 1 wt% sodium carbonate aqueous solution at 30 ° C. at a spray pressure of 0.18 MPa for 60 seconds. After the development, ultraviolet rays of 1,000 mJ / cm 2 were irradiated with a high pressure mercury lamp. After irradiation, it was cured at 150 ° C. for 90 minutes with a hot air circulating dryer to obtain a test specimen.
- ⁇ Heat resistance test> (1) Production of test specimen The 25 ⁇ m-thick dry film produced in (ii) above was used. The polyethylene film of the dry film was peeled off and bonded to a rolled copper foil having a thickness of 35 ⁇ m by vacuum lamination. The vacuum lamination was performed at a hot plate temperature of 50 to 60 ° C., a pressing pressure of 0.5 to 1.0 MPa, a pressing time of 10 to 20 seconds, and a degree of vacuum of 3 hPa or less. After vacuum laminating, ultraviolet rays of 200 mJ / cm 2 were irradiated with an ultra high pressure mercury lamp.
- the PET film was peeled off and developed with a 1 wt% sodium carbonate aqueous solution at 30 ° C. at a spray pressure of 0.18 MPa for 60 seconds. After the development, ultraviolet rays of 1,000 mJ / cm 2 were irradiated with a high pressure mercury lamp. After irradiation, it was cured at 150 ° C. for 90 minutes with a hot air circulating dryer to obtain a test specimen.
- the test specimen was left in a constant temperature and humidity chamber set at a temperature of 85 ° C. and a relative humidity of 85% RH. Solder was put into a solder bath to prepare a solder solution set at 240 ° C., 250 ° C. and 260 ° C. The test specimen left in the thermostatic chamber is taken out after 24 hours. Immediately after the test specimen is taken out, the test specimen is floated for 1 minute in the order of 250 ° C and 260 ° C solder solution from the solder solution set at 240 ° C. It was visually confirmed whether there was swelling or peeling. The heat resistance was evaluated based on the following evaluation criteria based on the temperature at which the test specimen was swollen or peeled off.
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Abstract
Description
<1>カルボキシル基及びエチレン性不飽和基を有する感光性プレポリマー、光重合開始剤及び熱硬化剤を含有し、前記熱硬化剤が、カルボジイミド基が80℃以上の温度で解離するアミノ基により保護された、下記式(1)で表されるポリカルボジイミド化合物であり、前記ポリカルボジイミド化合物が、重量平均分子量が300~3000であり、カルボジイミド当量が150~600であることを特徴とする感光性樹脂組成物。
<2>前記ポリカルボジイミド化合物のカルボジイミドの官能基数が2~5であることを特徴とする前記<1>に記載の感光性樹脂組成物。
<3>前記ポリカルボジイミド化合物の前記カルボジイミド当量が、前記感光性プレポリマーの前記カルボキシル基に対して0.9~1.3当量であることを特徴とする前記<1>又は<2>に記載の感光性樹脂組成物。
<4>ソルダーレジストフィルムに用いられることを特徴とする前記<1>~<3>のいずれか1つに記載の感光性樹脂組成物。
<5>前記<1>~<4>のいずれか1つに記載の感光性樹脂組成物を用いて形成されたことを特徴とするソルダーレジストフィルム。
<7>さらに、前記ソルダーレジスト層の上に導電性材料を含むシールド層を備え、硬化後の膜厚で前記配線パターンと前記シールド層との層間距離が10μmとなるように前記ソルダーレジスト層を設けてフレキシブルプリント配線板を作製し、該フレキシブルプリント配線板を、温度85℃、相対湿度85%RHの雰囲気下で、電圧50Vを印加しながら抵抗値の連続測定を行った際に、1.0×107Ω以上の抵抗値を500時間以上継続することを特徴とする前記<6>に記載のフレキシブルプリント配線板。
<8>配線パターンを備える基板と、前記配線パターンを被覆するソルダーレジスト層と、前記ソルダーレジスト層の上に設けられたシールド層と、を備えるフレキシブルプリント配線板であって、前記ソルダーレジスト層にアシルウレアを含み、前記シールド層は導電性材料からなり、熱圧プレス後の前記配線パターンと前記シールド層との層間距離が20μm未満における、前記フレキシブルプリント配線板の電気絶縁特性が、温度85℃、相対湿度85%RHの雰囲気下で、電圧50Vを印加しながらの抵抗値が1.0×107Ω以上であり、前記抵抗値が500時間以上継続することを特徴とするフレキシブルプリント配線板。
<9>前記<6>~<8>のいずれか1つに記載のフレキシブルプリント配線板を備えたことを特徴とする画像表示装置。
また、本発明の感光性樹脂組成物によれば、ポリカルボジイミド化合物中のカルボジイミド基がアミノ基で保護されているので、組成物中では感光性プレポリマーと反応することがない。これにより80℃未満の温度で加熱加工してフィルム化した後であっても、カルボジイミドの反応を抑えることができ、フィルム状態で常温にて2週間以上保存できる。すなわち、フィルム化後に時間が経過した後であっても現像可能となる。
なお、本発明において、(メタ)アクリル酸とはアクリル酸又はメタクリル酸を意味し、(メタ)アクリレートについても同様である。
また、質量で表される全ての百分率や部は、重量で表される百分率や部と同様である。
本実施形態における感光性プレポリマーとしては、好ましくはアクリル系モノマーに由来するエチレン性不飽和末端基を有するものが用いられる。ここでいうアクリル系モノマーは、アクリル酸若しくはメタクリル酸、またはこれらのアルキルエステル、ヒドロキシアルキルエステル等の誘導体である。
本実施形態におけるカルボキシル基を有するエポキシ(メタ)アクリレート化合物としては、特に限定されるものでは無いが、エポキシ化合物と不飽和基含有モノカルボン酸との反応物を酸無水物と反応させて得られるエポキシ(メタ)アクリレート化合物が適している。
本実施形態におけるカルボキシル基を有するウレタン(メタ)アクリレート化合物は、ヒドロキシル基を有する(メタ)アクリレート由来の単位と、ポリオール由来の単位と、ポリイソシアネート由来の単位とを構成単位として含む化合物である。より詳しくは、両末端がヒドロキシル基を有する(メタ)アクリレート由来の単位からなり、該両末端の間はウレタン結合により連結されたポリオール由来の単位とポリイソシアネート由来の単位とからなる繰り返し単位により構成され、この繰り返し単位中にカルボキシル基が存在する構造となっている。
-(OR11O-CONHR12NHCO)n-
〔式中、nは1~200の整数であり、OR11Oはポリオールの脱水素残基、R12はポリイソシアネートの脱イソシアネート残基を表す。〕
これらのヒドロキシル基を有する(メタ)アクリレートは1種を単独でまたは2種以上を組み合わせて用いることができる。
光重合開始剤としては、特に制限はなく、従来知られているものはいずれも使用できる。具体的には、代表的なものとしては例えば、ビス(2,4,6トリメチルベンゾイル)-フェニルフォスフィンオキサイド、2,4,6-トリメチルベンゾイルジフェニルホスフィンオキサイド、1,2-オクタンジオン,1-[4-(フェニルチオ)フェニル-,2-(O-ベンゾイルオキシム)]、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-(O-アセチルオキシム)、2-ベンジル-2-ジメチルアミノ-1-(4-モルフォリノフェニル)-ブタノン-1,2-(ジメチルアミノ)-2-[(4-メチルフェニル)メチル]-1-[4-(4-モルホリニル)フェニル]-1-ブタノン、ベンゾイン、ベンゾインメチルエーテル、ベンゾインエチルエーテル、ベンゾインイソプロピルエーテル、ベンゾインーnーブチルエーテル、ベンゾインイソブチルエーテル、アセトフェノン、ジメチルアミノアセトフェノン、2,2-ジメトキシ-2-フェニルアセトフェノン、2,2-ジエトキシ-2-フェニルアセトフェノン、2-ヒドロキシ-2-メチル-1-フェニルプロパン-1-オン、1-ヒドロキシシクロヘキシルフェニルケトン、2-メチル-1-〔4-(メチルチオ)フェニル〕-2-モルフォリノ-プロパン-1-オン、4-(2-ヒドロキエトキシ)フェニル-2-(ヒドロキシ-2-プロピル)ケトン、ベンゾフェノン、p-フェニルベンゾフェノン、4,4′-ジエチルアミノベンゾフェノン、ジクロルベンゾフェノン、2-メチルアントラキノン、2-エチルアントラキノン、2-ターシャリーブチルアントラキノン、2-アミノアントラキノン、2-メチルチオキサントン、2-エチルチオキサントン、2-クロルチオキサントン、2,4-ジメチルチオキサントン、2,4ジエチルチオキサントン、ベンジルジメチルケタール、アセトフェノンジメチルケタール、p-ジメチルアミノ安息香酸エチルエステル等が挙げられる。これらは1種を単独でまたは2種以上を組み合わせて用いることができる。
中でも、厚膜硬化性の観点から、ビス(2,4,6トリメチルベンゾイル)-フェニルフォスフィンオキサイド、2,4,6-トリメチルベンゾイルジフェニルホスフィンオキサイド、2-ベンジル-2-ジメチルアミノ-1-(4-モルフォリノフェニル)-ブタノン-1,2-(ジメチルアミノ)-2-[(4-メチルフェニル)メチル]-1-[4-(4-モルホリニル)フェニル]-1-ブタノン、チオキサントン類を用いることが好ましい。
本実施形態で用いる熱硬化剤は、感光性プレポリマーのカルボキシル基と反応し得るカルボジイミド基を含有するポリカルボジイミド化合物である。本実施形態のポリカルボジイミド化合物は、その構造中のカルボジイミド基が80℃以上の温度で解離するアミノ基により保護されていることを特徴とする。なお、「保護される」とは、カルボジイミド基とアミノ基が共有結合しているが、熱によって解離する程度の結合であることを意味する。
より詳しくは80℃未満の温度で加熱してフィルム化し、同じく80℃未満の温度で熱ラミネート処理などの熱圧着処理を行っているため、カルボジイミド基からアミノ基が解離しておらず、この時点でも精度良く現像することができると考えられる。さらに本発明の感光性樹脂組成物は、熱圧着処理の際に適度な流動性を持つことから、FPCのパターン回路の埋め込みを好適に行うことができる。この後に現像処理を行い、所定の位置に開口部を形成する。この後、アミノ基が解離する80℃以上の温度で加熱することで、アミノ基が解離し、カルボジイミド基がカルボキシル基と反応し、感光性樹脂組成物を完全に硬化させること(Cステージ)ができる。ここでカルボジイミド基とカルボキシル基との反応により、アシルウレアという構造が形成される。このような構造が形成されることにより、硬化後の樹脂組成物中の未反応のカルボキシル基が減少し、結果的に耐マイグレーション特性に寄与することが予想される。
直鎖又は分岐鎖の炭素数1~6のアルキル基としては、例えば、メチル基、エチル基、プロピル基、イソプロピル基、n-ブチル基、sec-ブチル基、イソブチル基、tert-ブチル基、ペンチル基、ヘキシル基等が挙げられ、炭素数3~6のシクロアルキル基としては、例えば、シクロプロピル基、シクロブチル基、シクロペンチル基、シクロヘキシル基等が挙げられる。
中でも、工業的原料の汎用性の高さの観点から、4,4’-ジフェニルメタンジイソシアネート、2,4-トリレンジイソシアネート、2,6-トリレンジイソシアネートの2価の残基が好ましい。
本実施形態においては、R4はヒドロキシアルキル基から水酸基を除いた残基であることが好ましく、メチル基、エチル基がより好ましい。
言い換えれば、カルボジイミドの官能基数は2~6官能であり、感光性樹脂組成物の硬化時の反りを生じ難くするという観点から、カルボジイミドの官能基数は2~5官能であることが好ましい。
なお、本発明において、重量平均分子量は、ゲルパーミエーションクロマトグラフィーを用い、ポリスチレン換算により測定される値である。
本発明の実施形態において、感光性樹脂組成物中に光重合性化合物を含有してもよい。
本実施形態における本成分の光重合性化合物の例としては、光架橋が可能なものであれば特に制限はないが、エチレン性不飽和結合を有する化合物を用いることが好ましい。分子内にエチレン性不飽和結合を有する化合物としては、(メタ)アクリレート化合物、ビスフェノールA系ジ(メタ)アクリレート化合物、エポキシアクリレート化合物、変性エポキシアクリレート化合物、脂肪酸変性エポキシアクリレート化合物、アミン変性ビスフェノールA型エポキシアクリレート化合物、水添ビスフェノールA系ジ(メタ)アクリレート化合物、分子内にウレタン結合を有するジ(メタ)アクリレート化合物、分子内に疎水性骨格を有する(メタ)アクレート化合物、分子内に(ポリ)オキシエチレン鎖及び(ポリ)オキシプロピレン鎖の双方を有するポリアルキレングリコールジ(メタ)アクリレート化合物、トリメチロールプロパンジ(メタ)アクリレート化合物、ポリエステルアクリレート化合物等が挙げられる。これらは単独で、又は2種以上を組み合わせて用いることができる。
本発明の感光性樹脂組成物には、さらに着色剤を含有してもよい。着色剤を含有することで、パターン回路の形状と解像性を制御することができる。
有機顔料としては、例えば、フタロシアニン系、キナクリドン系、ベンズイミダゾロン系、ジオキサジン系、インダンスレン系、ペリレン系、アゾ系、キノフタロン系、アントラキノン系、アニリン系、シアニン系等の有機顔料が挙げられる。
無機顔料としては、例えば、カーボンブラック、チタンブラック、ウルトラマリン青、プロシア青、黄鉛、亜鉛黄、鉛丹、酸化鉄赤、亜鉛華、鉛白、リトポン、二酸化チタン等が挙げられる。
これらは1種を単独で用いてもよく、2種以上を組み合わせて用いてもよい。中でも、絶縁性の観点から、有機顔料を用いることが好ましい。
黒色顔料としては、例えば、チタンブラック、カーボンブラック、カーボンナノチューブ、アセチレンブラック、アニリンブラック、ペリレンブラック、チタン酸ストロンチウム、酸化クロム及び酸化セリウム等が挙げられる。
本発明の感光性樹脂組成物には、本発明の所望の効果を妨げない範囲においてその他の成分を含有することができる。その他の成分としては、例えば、難燃剤、可塑剤、充填剤等を含有することができる。
難燃剤としては、例えば、有機ホスフィン酸系難燃剤、金属酸化物、リン酸エステル、ホスファゼン化合物、メラミンとその熱縮合物とポリリン酸の塩、メラミンとイソシアヌル酸の化合物等が挙げられる。
可塑剤としては、例えば、p-トルエンスルホンアミド等が挙げられる。
充填剤としては、例えば、シリカ、アルミナ、タルク、炭酸カルシウム、硫酸バリウム等が挙げられる。
これらの成分は、1種を単独で用いてもよく、2種以上を組み合わせて用いてもよい。
本発明の感光性樹脂組成物の作製方法は、従来公知の方法に従って作製することができ、特に限定されない。例えば、感光性プレポリマーに、光重合開始剤、熱硬化剤及びその他の任意成分を順次混合することにより作製することができる。
混合工程は、ビーズミルやロールミル等のミキサーを用いて混合することができる。
本発明の感光性フィルムは、支持体と、該支持体上に形成された感光性樹脂組成物層とを備え、感光性樹脂組成物層は上記感光性樹脂組成物を含有している。感光性フィルムは、感光性樹脂組成物層の支持体とは反対側の面に保護フィルム層を有していてもよい。
本実施形態に係る感光性フィルムによれば、可撓性に優れるとともに当該感光性フィルムを硬化した後、ソルダーレジストフィルムを容易に形成することができる。
感光性樹脂組成物層は、本発明の感光性樹脂組成物を、メタノール、エタノール、アセトン、メチルエチルケトン、メチルセロソルブ、エチルセロソルブ、トルエン、N,N-ジメチルホルムアミド、プロピレングリコールモノメチルエーテル等の溶剤又はこれらの混合溶剤に溶解し、固形分30~70質量%程度の溶液とした後に、かかる溶液を支持体上に塗布して形成することが好ましい。
支持体の厚みは、用途、当該樹脂組成物の厚みより適宜選択することができる。
なお、感光性フィルムが保護フィルムを有する場合は、感光性フィルムから保護フィルムを除去する工程を有する。
積層工程において、感光性樹脂組成物層の加熱は、30℃以上80℃未満の温度で行うことが好ましく、圧着圧力は0.1~2.0MPa程度とすることが好ましく、周囲の気圧は3hPa以下とすることが好ましい。加熱温度が80℃以上になると、感光性樹脂組成物中のポリカルボジイミド化合物のアミノ基がカルボキシル基から解離するため、解離温度よりも低い温度で積層工程を行う。
上記の方法により、絶縁層の上に配線パターンとソルダーレジスト層がこの順に形成されたフレキシブルプリント配線板(FPC)が得られ、カルボジイミド基とカルボキシル基との反応により、アシルウレアという構造がソルダーレジスト層内に形成される。本発明においては、FPCはソルダーレジスト層の上にさらに、導電性材料を含むシールド層を備えてもよい。
シールド層を構成する導電性材料としては、金属が挙げられる。金属としては、例えば、金、銀、銅、アルミニウム、ニッケル、これらの合金等が挙げられる。
上記の耐環境試験を行った際に、フレキシブルプリント配線板の電気絶縁特性が、1.0×107Ω以上の抵抗値を500時間以上、好ましくは抵抗値の持続時間が1000時間以上であれば、実用上極めて優れた耐マイグレーション特性を有するソルダーレジストであると言える。なお、上記耐環境試験における1.0×107Ω以上の抵抗値を500時間以上継続させるには、本発明の感光性樹脂組成物によりソルダーレジスト層を形成することにより達成することが可能である。
また、本発明の画像表示装置は、本発明のフレキシブルプリント配線板(FPC)を備える。本発明の画像表示装置は、例えば、液晶パネルディスプレイにおいて表面に液晶表示部を有する液晶表示基板と、液晶表示基板の駆動回路が設けられたプリント基板と、液晶表示基板とプリント基板とを電気的に接続するためのフレキシブルプリント配線板(FPC)を備え、当該FPCとして本発明のフレキシブルプリント配線板を用いる。
(i)感光性樹脂組成物の作製
表2に示す配合割合にて各成分を配合し、ミキサーにて混合させて、実施例1~10、比較例1~3にて使用する感光性樹脂組成物を得た。なお、表2中のポリカルボジイミドは表1に記載のものを使用し、これらは上記ポリカルボジイミド化合物群Aに該当する。また、表2中のポリカルボジイミドの当量数は、感光性プレポリマーに含まれるカルボキシル基に対するカルボジイミド基の当量数を表す。
上記(i)で得た感光性樹脂組成物を、乾燥後の厚さが16μm又は25μmとなるように25μm厚のポリエチレンテレフタレート(PET)フィルム上にそれぞれ塗布し、80℃で5分間乾燥させた後、塗布面側にポリエチレンフィルムを貼り合わせてドライフィルムを得た。
(1)試験検体の作製
25μm厚のポリイミド製基材の片側に、厚さ12μm、ライン幅50μm、スペース幅50μmの銅のストレート回路パターンを設けたフレキシブル銅張積層板(株式会社有沢製作所製「PNS H1012RAH」)を準備した。上記(ii)で作製した16μm厚さのドライフィルムのポリエチレンフィルムを剥離し、フレキシブル銅張積層板へ真空ラミネートにより貼り合わせた。真空ラミネートは、熱板温度50~60℃、プレス圧力0.5~1.0MPa、プレス時間10~20秒、真空度3hPa以下にて実施した。真空ラミネート後、超高圧水銀ランプにて200mJ/cm2の紫外線を照射した。照射後、PETフィルムを剥離し、30℃の1wt%炭酸ナトリウム水溶液により、スプレー圧0.18MPaで60秒間現像を行った。現像後、高圧水銀ランプにて1,000mJ/cm2の紫外線を照射した。照射後、熱風循環式乾燥機にて、150℃、90分硬化させた。硬化後、ドライフィルムの上部に電磁波シールドフィルム(タツタ電線株式会社製「SF-PC8600/-C」)を熱圧プレスにより貼り合わせ、試験検体を作製した。熱圧プレス条件は、熱板温度180℃、プレス圧力2.94MPa、プレス時間60分にて実施した。なお、回路パターンと電磁波シールドフィルムとの層間距離は10μmであった。
作製した試験検体の電磁波シールドフィルム側を陰極に、フレキシブル銅張積層板の銅側を陽極に、それぞれ接続した。次いで、85℃、85%RHに設定した恒温恒湿槽の中で、50Vの印加を行い、イオンマイグレーションテスター(エスペック社製「AMI-025-S-5」)を用いて抵抗値の連続測定を行った。抵抗値が1.0×107Ω未満を絶縁破壊とし、絶縁破壊するまでの時間を計測した。
〔判定基準〕
◎:1000時間印加後も抵抗値が1.0×107Ω以上を保持。
○:500時間以上1000時間未満で抵抗値が1.0×107Ω未満に低下。
△:250時間以上500時間未満で抵抗値が1.0×107Ω未満に低下。
×:250時間未満で抵抗値が1.0×107Ω未満に低下。
(1)試験検体の作製
上記(ii)で作製した25μm厚さのドライフィルムを23℃で暗所保管した。下記評価基準に示す所定の期間で保管したドライフィルムのポリエチレンフィルムを剥離し、35μm厚の圧延銅箔へ真空ラミネートにより貼り合わせ試験検体を作製した。真空ラミネートは、熱板温度50~60℃、プレス圧力0.5~1.0MPa、プレス時間10~20秒、真空度3hPa以下にて実施した。
所定のパターン(φ100μm)が形成されたフォトマスクを介し、超高圧水銀ランプにて200mJ/cm2の紫外線を照射した。照射後、PETフィルムを剥離し、ドライフィルムに30℃、1wt%炭酸ナトリウム水溶液を、スプレー圧0.18MPaで60~120秒間現像を行った。解像性について、下記基準により評価した。
〔評価基準〕
◎:23℃/4週間以上保管後もφ100μmの解像性が得られ、現像残渣無し。
○:23℃/3週間以上の保管後においてφ100μmの解像性が得られた。
△:23℃/2週間以上の保管後においてφ100μmの解像性が得られた。
×:23℃/2週間未満の保管でφ100μmの解像性が得られなくなった。
(1)試験検体の作製
上記(ii)で作製した25μm厚さのドライフィルムを用いた。ドライフィルムのポリエチレンフィルムを剥離し、35μm厚の圧延銅箔へ真空ラミネートにより貼り合わせた。真空ラミネートは、熱板温度50~60℃、プレス圧力0.5~1.0MPa、プレス時間10~20秒、真空度3hPa以下にて実施した。真空ラミネート後、超高圧水銀ランプにて200mJ/cm2の紫外線を照射した。照射後、PETフィルムを剥離し、30℃の1wt%炭酸ナトリウム水溶液により、スプレー圧0.18MPaで60秒間現像を行った。現像後、高圧水銀ランプにて1,000mJ/cm2の紫外線を照射した。照射後、熱風循環式乾燥機にて、150℃、90分硬化させ、試験検体を得た。
試験検体を縦10cm×横10cmにカットした後、カットした試験検体を水平な台上に凹部が上向きになるように静置し、外力を加えないようにして、試験検体の端部と台との間の距離を、スケールで測定した。評価基準は以下の通りである。
〔判定基準〕
◎:5mm未満
○:5mm以上1cm未満
△:1cm以上3cm未満
×:3cm以上
(1)試験検体の作製
上記(ii)で作製した25μm厚さのドライフィルムを用いた。ドライフィルムのポリエチレンフィルムを剥離し、35μm厚の圧延銅箔へ真空ラミネートにより貼り合わせた。真空ラミネートは、熱板温度50~60℃、プレス圧力0.5~1.0MPa、プレス時間10~20秒、真空度3hPa以下にて実施した。真空ラミネート後、超高圧水銀ランプにて200mJ/cm2の紫外線を照射した。照射後、PETフィルムを剥離し、30℃の1wt%炭酸ナトリウム水溶液により、スプレー圧0.18MPaで60秒間現像を行った。現像後、高圧水銀ランプにて1,000mJ/cm2の紫外線を照射した。照射後、熱風循環式乾燥機にて、150℃、90分硬化させ、試験検体を得た。
〔判定基準〕
◎:はんだ液の温度が260℃でも試験検体に膨れ・剥がれ無し。
○:はんだ液の温度が260℃で試験検体に膨れ・剥がれ発生。
△:はんだ液の温度が250℃で試験検体に膨れ・剥がれ発生。
×:はんだ液の温度が240℃で試験検体に膨れ・剥がれ発生。
Claims (9)
- カルボキシル基及びエチレン性不飽和基を有する感光性プレポリマー、光重合開始剤及び熱硬化剤を含有し、
前記熱硬化剤が、カルボジイミド基が80℃以上の温度で解離するアミノ基により保護された、下記式(1)で表されるポリカルボジイミド化合物であり、
前記ポリカルボジイミド化合物が、重量平均分子量が300~3000であり、カルボジイミド当量が150~600である感光性樹脂組成物。
- 前記ポリカルボジイミド化合物のカルボジイミドの官能基数が2~5である、請求項1に記載の感光性樹脂組成物。
- 前記ポリカルボジイミド化合物の前記カルボジイミド当量が、前記感光性プレポリマーの前記カルボキシル基に対して0.9~1.3当量である、請求項1又は請求項2に記載の感光性樹脂組成物。
- ソルダーレジストフィルムに用いられる、請求項1~3のいずれか1項に記載の感光性樹脂組成物。
- 請求項1~4のいずれか1項に記載の感光性樹脂組成物を用いて形成されたソルダーレジストフィルム。
- 絶縁層の上に、導電性材料からなる配線パターンとソルダーレジスト層とがこの順に設けられた構成を有するフレキシブルプリント配線板であって、
前記ソルダーレジスト層が、請求項1~4のいずれか1項に記載の感光性樹脂組成物を用いて形成されたフレキシブルプリント配線板。 - さらに、前記ソルダーレジスト層の上に導電性材料を含むシールド層を備え、
硬化後の膜厚で前記配線パターンと前記シールド層との層間距離が10μmとなるように前記ソルダーレジスト層を設けてフレキシブルプリント配線板を作製し、該フレキシブルプリント配線板を、温度85℃、相対湿度85%RHの雰囲気下で、電圧50Vを印加しながら抵抗値の連続測定を行った際に、1.0×107Ω以上の抵抗値を500時間以上継続する、請求項6に記載のフレキシブルプリント配線板。 - 配線パターンを備える基板と、
前記配線パターンを被覆するソルダーレジスト層と、
前記ソルダーレジスト層の上に設けられたシールド層と、を備えるフレキシブルプリント配線板であって、
前記ソルダーレジスト層にアシルウレアを含み、
前記シールド層は導電性材料からなり、熱圧プレス後の前記配線パターンと前記シールド層との層間距離が20μm未満における、前記フレキシブルプリント配線板の電気絶縁特性が、温度85℃、相対湿度85%RHの雰囲気下で、電圧50Vを印加しながらの抵抗値が1.0×107Ω以上であり、前記抵抗値が500時間以上継続するフレキシブルプリント配線板。 - 請求項6~8のいずれか1項に記載のフレキシブルプリント配線板を備えた画像表示装置。
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- 2017-02-28 CN CN201780085768.5A patent/CN110268323B/zh active Active
- 2017-04-10 TW TW106111871A patent/TWI675056B/zh active
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Also Published As
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TW201829583A (zh) | 2018-08-16 |
CN110268323B (zh) | 2023-03-24 |
KR102444761B1 (ko) | 2022-09-20 |
US10627716B2 (en) | 2020-04-21 |
TWI675056B (zh) | 2019-10-21 |
US20200026186A1 (en) | 2020-01-23 |
CN110268323A (zh) | 2019-09-20 |
KR20190113803A (ko) | 2019-10-08 |
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