WO2005099328A1 - 回路基板及びその製造方法 - Google Patents
回路基板及びその製造方法 Download PDFInfo
- Publication number
- WO2005099328A1 WO2005099328A1 PCT/JP2005/003038 JP2005003038W WO2005099328A1 WO 2005099328 A1 WO2005099328 A1 WO 2005099328A1 JP 2005003038 W JP2005003038 W JP 2005003038W WO 2005099328 A1 WO2005099328 A1 WO 2005099328A1
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- WIPO (PCT)
- Prior art keywords
- circuit board
- insulating layer
- layer
- conductor layer
- primer
- Prior art date
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Classifications
-
- 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
- H05K1/0237—High frequency adaptations
- H05K1/024—Dielectric details, e.g. changing the dielectric material around a transmission line
-
- 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
- H05K1/05—Insulated conductive substrates, e.g. insulated metal substrate
-
- 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
-
- 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
- H05K3/38—Improvement of the adhesion between the insulating substrate and the metal
- H05K3/389—Improvement of the adhesion between the insulating substrate and the metal by the use of a coupling agent, e.g. silane
-
- 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
- H05K1/0237—High frequency adaptations
- H05K1/0242—Structural details of individual signal conductors, e.g. related to the skin effect
Definitions
- the present invention relates to a circuit board, and more particularly, to a circuit board, which has high adhesion between a conductor layer and an electric insulation layer or between electric insulation layers, and has a high frequency signal flowing through a circuit, which has a high noise level.
- the present invention relates to a circuit board, electronic equipment using the circuit board, and a method of manufacturing a circuit board, in which crosstalk and radiation noise between adjacent conductors (wirings) do not easily enter.
- the conductor layer may be either a layer composed of only a conductor or a layer including a circuit formed by the conductor.
- a multilayered circuit board (multilayer circuit board) is formed by laminating a first electric insulating layer on an inner layer substrate composed of a first conductor layer formed on a base, and forming the first electric insulating layer.
- a second conductor layer By forming the second conductor layer on the layer, it can be obtained by further laminating several layers of the second and subsequent electric insulating layers and the third and subsequent conductor layers as necessary.
- Some portions of conductor layers in a multilayer circuit board are usually connected by wiring such as via holes in order to supply current between power circuits, which are normally insulated by an electric insulating layer, as necessary. .
- Patent Document 1 discloses an inner substrate having a conductor layer formed on a surface of an electrical insulating layer.
- a primer layer having a thiol bonding property is formed on a conductor layer having a roughness Ra of 0.1 to 5 m, and another electric insulating layer made of a curable resin composition is formed on the primer layer.
- Ra roughness of 0.1 to 5 m
- Patent Document 1 JP 2003-53879 A
- a technical problem of the present invention is to provide high adhesion between a conductor layer having a low surface roughness and an electric insulating layer, and to suppress noise when a high-frequency signal flowing through a circuit is conducted, and to reduce noise in an adjacent conductor (
- An object of the present invention is to provide a circuit board that suppresses crosstalk between wirings and radiation noise.
- a circuit board including a first conductor layer formed on a base, and a first electric insulating layer formed on the first conductor layer,
- the first conductor layer has a surface roughness Ra of at least 0.1 nm and less than 100 nm, and a thiol compound (a) as a main material between the first conductor layer and the first electrical insulating layer.
- an electronic apparatus including a circuit board, wherein the circuit board includes a first conductor layer formed on a base, A first electrical insulating layer formed on the conductive layer, wherein the first conductive layer has a surface roughness Ra of 0.1 nm or more; Less than OO nm, and a first primer layer containing a thiol compound (a) as a main material is formed between the first conductor layer and the first electric insulating layer.
- the surface of the substrate on which the first conductor layer is formed is brought into contact with a metal corrosive.
- the first primer layer is formed by contacting an object, and then, an uncured or semi-cured resin molded article using the curable resin composition is laminated on the first primer layer. Then, a method for manufacturing a circuit board is obtained, in which the resin molded body is cured to form a first electrical insulating layer.
- the adhesion between the conductor layer having a low surface roughness and the electrical insulating layer is high, the noise when a high-frequency signal flowing through the circuit is conducted, and the noise between adjacent conductors (wirings).
- a circuit board with reduced crosstalk and radiation noise can be provided.
- FIG. 1 is a cross-sectional view showing one configuration example of a circuit board according to the present invention.
- the first conductor layer is formed on the base, and the first conductor layer is formed on the first conductor layer.
- a first electrical insulating layer The surface roughness Ra of the first conductor layer is not less than 0.1 Inm and less than 100 nm, and the thiol-conjugated product (a) is provided between the first conductor layer and the first electric insulating layer.
- a first primer layer as a main material is formed.
- the surface roughness Ra of the first electric insulating layer is not less than 0.1 Inm and not more than 400 nm.
- a second conductor layer a second primer layer mainly composed of a titanium conjugate (b) as a main material, and a second electric layer are provided on the first electric insulating layer. It is preferable that the insulating layers are laminated in this order.
- a surface roughness Ra of the second conductor layer is 0.1 Inm to 1 m.
- the surface roughness Ra of the second conductive layer is not less than 0. , Less than 100 nm.
- the surface roughness Ra of the second electric insulating layer is not less than 0.1 Inm and not more than 400 nm.
- the thiol compounds (a) and (b) of the first and second primer layers are represented by the following formula (1) or (2). Compounds or alkali metal salts thereof are preferred!
- ⁇ , ⁇ 3 are each independently one SH, - SR - NR 'R ", or one SM (R, R, and R", charcoal 1-5 independently Is the alkiso of M, M is an alkali metal) and at least one of these is one SH)
- R and R 4 are each independently —OR is a linear or branched alkyl group having 1 to 5 carbon atoms) or —C 1 to 5 having at least one SH. And at least one of them is a straight-chain or branched alkyl group having 1 to 5 carbon atoms and having one or more —SH.
- the thiol conjugates (a) and (b) of the first and second primer layers are compounds represented by the above formula (1); In equation (1)
- X 1 — X 3 is preferably all one SH! / ,.
- the first electrical insulating layer is formed by curing a curable resin composition containing an alicyclic olefin polymer.
- the second electric insulating layer is formed by curing a curable resin composition containing an alicyclic olefin polymer.
- the relative permittivity of the first electric insulating layer is ⁇ r and the relative magnetic permeability is / zr, at least a part of the first electric insulating layer is ⁇ r. It is preferable to satisfy the relationship of ⁇ / zr.
- the relative permittivity of the second electric insulating layer is ⁇ r and the relative magnetic permeability is / zr
- at least a part of the second electric insulating layer is ⁇ r It is preferable to satisfy the relationship of ⁇ / zr.
- An electronic device of the present invention includes any one of the circuit boards.
- a primer composition comprising: a first conductor layer having a surface roughness Ra of 0.1 nm or more and less than 100 nm; and a thiol-conjugated product (a) on the surface of the substrate on which the first conductor layer is formed.
- first primer layer To form a first primer layer, and thereafter, an uncured or semi-cured resin molded article using a curable resin composition is laminated on the first primer layer, and then A method for obtaining a circuit board by curing the resin molded body to form a first electrical insulating layer It is.
- the method for manufacturing a circuit board may include a step of bringing the surface of the first electrical insulating layer into contact with an oxidizing compound to adjust the surface roughness Ra to 0.1 nm or more and 400 nm or less. Is preferred.
- the method for manufacturing a circuit board according to the present invention is a method for manufacturing any one of the above-mentioned circuit boards, wherein the surface roughness is 0.1 nm or more and 400 nm or less on the first electric insulating layer.
- Forming a second primer layer by contacting a primer composition containing a thiol compound (b) with the surface of the substrate on which the second conductor layer has been formed, Then, a film-shaped molded body using the curable resin composition is laminated on the second primer layer, and then the film-shaped molded body is cured to form a second electric insulating layer.
- this is a method of obtaining a circuit board.
- the surface roughness Ra of the first and second conductor layers is preferably 0.1 nm or more and less than 100 nm. This is because when the surface roughness Ra of each conductor layer exceeds 100 nm, signal loss occurs due to the surface roughness, and when it is smaller than 0.1 nm, the adhesion to the electrical insulation layer deteriorates. It is.
- the surface roughness Ra of each electric insulating layer is 0.1 nm or more and 400 nm or less. This is because when the surface roughness Ra force of the electrical insulating layer exceeds OO nm, it becomes difficult to form a fine pattern on the conductor layer, while when it is smaller than 0.1 nm, the electrical insulating layer is laminated, When cured, for example, it is a force that may not be able to secure adhesion between the first and second electrical insulating layers.
- the circuit board of the present invention has a structure in which a primer layer and an electrical insulating layer are laminated on one or both sides of an inner layer substrate in which an electrical insulating layer and a conductor layer are laminated, It may be a multilayer circuit board in which a plurality of electrical insulation layers and conductor layers are laminated.
- an inner layer substrate 100 used in the present invention has a first surface having a surface roughness Ra adjusted to 0.1 or more and less than 100 nm on a surface of a substrate 1 made of an electric insulating layer.
- a conductor layer 2 is formed, on which a first electric insulating layer 3 is formed.
- a second conductor layer 4 having a surface roughness Ra adjusted to 0.1 nm to 1 ⁇ m is formed thereon, and a second electric layer 4 is formed thereon.
- An insulating layer 5 is formed.
- the second conductive layer 4 and the second electric insulating layer 5 may not be present, but may be formed in a multi-stage structure in which the second conductive layer 4 and the second electric insulating layer 5 are repeatedly laminated.
- the surface roughness Ra of the second conductor layer 4 is preferably 0.1 nm or more and less than 100 nm as in the case of the first conductor layer 2.
- a primer layer (not shown) is formed between the first and second conductor layers 2 and 4 and the first and second electric insulators 3 and 5, respectively.
- the first electric insulating layer 3 according to the present invention is formed of a known electric insulating material (for example, an alicyclic resin, epoxy resin, maleimide resin, (meth) acrylic resin, diaryl phthalate). Resin, a resin, a triazine resin, a polyether ether, glass, etc.).
- the first electric insulating layer 3 according to the present invention may be the second electric insulating layer 5 which is the outermost electric insulating layer of the circuit board having the electric insulating layer and the conductor layer.
- the first electrical insulating layer 3 for the interlayer a layer obtained by curing a curable resin composition containing an alicyclic olefin polymer described below is preferable. The surface of the first electric insulating layer 3 may be brought into contact with an oxidizing compound or plasma to increase the adhesion between the electric insulating layers.
- the first and second conductor layers 2, 4 formed on the surfaces of the base 1 and the first electric insulating layer 3 are electric circuits formed of a conductor such as a conductive metal.
- the configuration and the like can be the same as those used for ordinary multilayer circuit boards.
- the conductive metal is copper, it exhibits extremely high adhesion.
- Examples of a method for forming the first and second conductor layers 2 and 4 on the surface of the base or the first electrical insulating layer 3 include plating and sputtering, and plating from the viewpoint of productivity. Is preferred.
- the surface roughness Ra of the first conductor layer 2 according to the present invention is 0.1 nm or more, less than 100 nm, preferably lnm-95 nm, more preferably 40 nm-90 nm, and the second conductor layer 2
- the surface roughness Ra of No. 4 is 0.1 nm to 1 ⁇ m, preferably 0.1 nm or more and less than 100 nm. When Ra is within this range, high adhesion to the electric insulating layer can be obtained.
- the surface roughness Ra is a value defined in JIS B0601-1994.
- inorganic alkali acid salts such as sodium perchlorate and sodium persulfate
- inorganic acids such as sulfuric acid and hydrochloric acid
- organic acids such as formic acid, acrylic acid, oxalic acid, and citric acid
- roughening treatment method in which an agent is brought into contact with a substrate.
- an inorganic acid it is easy to obtain the surface roughness Ra in the above-described range, which is preferable.
- the concentration of the active ingredient in the metal caustic is usually 0.1 to 20% by weight, preferably 0.1 to 10% by weight, and the treatment temperature is arbitrarily set in consideration of the boiling point of the metal caustic.
- the temperature is usually 25 to 120 ° C, preferably 50 to 100 ° C, and the treatment time is several seconds to 60 minutes, more preferably several seconds to 30 minutes.
- the inner layer substrate having the electric insulating layer and the conductor layer described above include a printed wiring substrate and a silicon wafer substrate.
- the thickness of the inner substrate is usually 10 m to 2 mm, preferably 25 ⁇ m to 1.6 mm, more preferably 40 ⁇ m to 1 mm.
- the primer layer formed on the surface of the above-described inner layer substrate is mainly composed of the thiol conjugates (a) and (b).
- thiol compound (a) and the thiol compound (b) will be described together as “thiol compounds. Note that the thiol compound (a) and the thiol compound (b) are different even if they are the same. Is also good.
- the thiol conjugate used in the present invention is a compound having an SH group.
- preferred! / Thiol compounds include triazine thiol compounds such as 2,4,6 trimercapto-s triazine represented by the formula (1) and alkali metal salts thereof; And an alkyl group-bonded silani conjugate having a mercapto group such as ⁇ -mercaptopropyltrimethoxysilane or a derivative thereof.
- X and X 3 each independently represent one SH, -SR-NR'R ", or one SM (R, R, and R" independently represent charcoal 1 to $ SX is the US $ 1H branch, M is an alkali metal, and at least one of these is one SH)
- alkyl group-containing silani conjugates represented by the above formula (2) or derivatives thereof mercaptoalkyl trialkoxy silanes are particularly preferred in terms of a good balance between adhesion and operability.
- the thiol conjugate is brought into contact with the inner layer substrate.
- the method of contact is not particularly limited. Specific examples include a dip method in which the thiol conjugate is dissolved in water or an organic solvent to form a solution, and then the inner substrate is immersed in the solution for several seconds to several minutes, or the solution is sprayed on the surface of the inner substrate. Painted with For example, a spraying method for spreading a cloth, etc. may be mentioned. After the thiol ligated product and the inner layer substrate are brought into contact, they are dried. The drying method is not particularly limited.
- the drying temperature is usually 30 to 180 ° C, preferably 50 to 150 ° C, and the drying time is usually 1 minute or more, preferably 5 to 120 minutes, in an oven. Drying method.
- the conductor layer is made of a metal such as copper, it is preferable to dry under a nitrogen atmosphere, particularly from the viewpoint of preventing oxidation.
- the organic solvent in which the thiol diagonal compound is dissolved is not particularly limited, and polar solvents such as ethers such as tetrahydrofuran, alcohols such as ethanol and isopropanol, ketones such as acetone, and cellosolves such as ethyl ethyl sorbate acetate. Is preferred.
- the thiol compound concentration in the thiol compound solution is not particularly limited, but is usually 0.01 to 30% by weight, preferably 0.05 to 20% by weight.
- the primer layer is mainly composed of the thiol conjugate described above, and the components other than the thiol conjugate are the components of the thiol conjugate used in forming the primer layer.
- Other examples include a surfactant and other additives used for the purpose of improving the wetting between the inner layer substrate and the thiol compound.
- the amount of these additives used is also 10% by weight or less, preferably 5% by weight or less, more preferably 1% by weight or less based on the thiol ligated product in view of ensuring the adhesion.
- first electrical insulating layer 3 and second electrical insulating layer 5 there is no particular limitation on the material constituting first electrical insulating layer 3 and second electrical insulating layer 5, and a general electrical insulating material can be used.
- Preferred electric insulating materials include curable resin compositions containing an insulating polymer (hereinafter, may be simply referred to as curable resin compositions). It is preferred to use a formula-olefin polymer.
- the electrical insulating layer is formed by molding the curable resin composition into a predetermined shape and curing.
- the insulating polymer examples include epoxy resin, maleimide resin, (meth) acrylic resin, diaryl phthalate resin, triazine resin, alicyclic olefin polymer, aromatic polyether polymer, and benzocyclobutene. It is a polymer having electrical insulation such as a polymer, a cyanate ester polymer, a liquid crystal polymer, and a polyimide. Of these, alicyclic olefin polymers, aromatic polyether polymers, benzocyclobutene polymers, cyanate ester polymers or polyimides are preferred, and alicyclic olefin polymers or aromatic polyether polymers are preferred.
- the alicyclic olefin polymer preferably has a polar group.
- the polar group include a hydroxyl group, a carboxy group, an alkoxyl group, an epoxy group, a glycidyl group, an oxycarbol group, a carbonyl group, an amino group, an ester group, and a carboxylic anhydride group.
- Carboxylic anhydride groups are preferred.
- ring-opened polymers of norbornene-based monomers and hydrogenated products thereof addition polymers of norbornene-based monomers, addition polymers of norbornene-based monomers and vinyl compounds, and aromatic olefin copolymers
- a hydrogenated product of a ring-opened polymer of a norbornene-based monomer is particularly preferred, in which a combined aromatic hydrogenated product is preferred.
- the method for polymerizing alicyclic olefins and aromatic olefins, and the method for hydrogenation as required, can be carried out according to known methods without any particular limitation.
- the curing agent general ones such as an ionic curing agent, a radical curing agent, and a curing agent having both ionic and radical properties can be used.
- bisphenol A bis (propylene glycol Preferred are glycidyl ether type epoxy compounds such as (glycidyl ether) ether, alicyclic epoxy type conjugates, and polyvalent epoxy type conjugates such as glycidyl ester type epoxy compounds.
- a non-epoxy hardener having a carbon-carbon double bond such as 1,3-diallyl 5- [2-hydroxy-3 phenyloxypropyl] isocyanurate and contributing to the crosslinking reaction. You can also.
- the compounding ratio of the curing agent is usually in the range of 1 to 100 parts by weight, preferably 5 to 80 parts by weight, more preferably 10 to 50 parts by weight, based on 100 parts by weight of the insulating polymer.
- a tertiary amine compound such as 1-benzyl-2-phenylimidazole
- trifluorinated fluoride is used to accelerate the curing reaction.
- a curing accelerator or a curing assistant such as a nitrogen complex compound.
- the amount of the curing accelerator or the curing aid is usually 0.001 to 30 parts by weight, preferably 0.01 to 10 parts by weight, more preferably 0.03 to 5 parts by weight, per 100 parts by weight of the insulating polymer. Department.
- the blending amounts of the curing agent, the curing accelerator, and the curing assistant are appropriately selected depending on the purpose of use.
- a magnetic material can be added to the curable resin composition.
- the magnetic material is preferably a magnetic material that provides an electrically insulating layer having an electrical insulating property of ⁇ r ⁇ / zr (where ⁇ r is a relative dielectric constant and / zr is a relative magnetic permeability).
- Particularly preferred magnetic substances include insulating magnetic substance powders such as ferrite, and simple substances or alloys of metal magnetic elements such as Fe, Co, Ni, and Cr.
- the relative permittivity ⁇ r and relative permeability / zr of the electric insulating layer are the effective permittivity and the effective magnetic permeability that affect the electromagnetic wave propagating through the conductor, regardless of the structure of the electric insulating layer surrounding the conductor layer. evaluate.
- As a method of measuring the effective permittivity or the effective magnetic permeability it is possible to measure an electromagnetic wave actually propagating through the wiring and use a triplate line resonator method for determining the permittivity and the magnetic permeability.
- the amount of the magnetic substance is usually 1Z10 6 — based on 100 parts by weight of the alicyclic olefin polymer.
- the curable resin composition is usually prepared from, for example, aromatic hydrocarbon solvents such as toluene, xylene, ethylbenzene, and trimethylbenzene; and aliphatic hydrocarbons such as n-pentane, n-hexane, and n-heptane.
- aromatic hydrocarbon solvents such as toluene, xylene, ethylbenzene, and trimethylbenzene
- aliphatic hydrocarbons such as n-pentane, n-hexane, and n-heptane.
- Alicyclic hydrocarbons such as cyclopentane and cyclohexane; halogenated carbon solvents such as benzene, dichlorobenzene, and trichlorobenzene; methylethyl ketone, methyl isobutyl ketone, and cyclohexane Contains solvents such as ketone solvents such as pentanone and cyclohexanone. These solvents may be used alone or in combination of two or more.
- a mixed solvent obtained by mixing a non-polar solvent such as an aromatic hydrocarbon solvent or an alicyclic hydrocarbon solvent with a polar solvent such as a ketone solvent is preferable.
- the mixing ratio of these non-polar solvents and polar solvents can be appropriately selected.
- the amount of the solvent used is appropriately selected depending on the purpose of controlling the thickness and improving the flatness, etc.
- the solid content of the solution or dispersion of the power-curable resin composition is usually 5 to 70% by weight. , Preferably 10-65% by weight, more preferably 20-60% by weight.
- a soft polymer In addition to these components, a soft polymer, a heat stabilizer, a weather stabilizer, an antioxidant, a leveling agent, an antistatic agent, a slip agent, an antiblocking agent, an antifogging agent, a lubricant, a dye, Ingredients such as fillers, natural oils, synthetic oils, waxes, emulsions, fillers, dielectric property modifiers, and toughening agents.
- the amount of the optional component is appropriately selected within a range that does not impair the purpose of the present invention.
- the method for forming the electric insulating layer for a circuit board includes the steps of (a) using a film or sheet as an uncured or semi-cured resin molded article prepared in advance using the curable resin composition. After laminating on a layer substrate (a substrate having a conductor layer on one or both sides of the substrate), it is cured. (B) The curable resin composition is applied directly on the conductor layer of the inner substrate and dried. And (c) impregnating the curable resin composition into a glass fiber sheet-like support and drying, and laminating and curing the sheet on the inner substrate.
- the method (a) is also preferred because of the point force that can provide a smooth surface and easily form a high-density wiring immediately.
- the term "uncured" of the uncured or semi-cured resin molded article used in the method (a) means that substantially all of the polymer is dissolved in a solvent capable of dissolving the alicyclic olefin polymer. State.
- the term “semi-cured” refers to a state in which the composition is partially cured to the extent that it can be further cured by heating, and is preferably partially (particularly, specifically) dissolved in a solvent in which the alicyclic olefin polymer can be dissolved. Is 7% by weight or more), or the swelling ratio when the resin molded body is immersed in a solvent for 24 hours, or 200% or more of the volume before immersion.
- a curable resin composition which is obtained by a conventional method, is dip-coated on a support such as a resin film or a metal foil. And a method of applying a resin by a casting method using a roll coat, a curtain coat, a die coat, a slit coat, or the like, and then drying it to obtain a resin molded body.
- the thickness of the film or sheet that is an uncured or semi-cured resin molded product is usually 0.1 to 150 ⁇ m, preferably 0.5 to 100 ⁇ m, more preferably 1 to 80 ⁇ m. is there.
- a via hole penetrating through the laminate is provided in order to connect each conductor layer in the laminate.
- This via hole can be formed by a chemical treatment such as a photolithography method, or by a physical treatment such as a drill, laser, or plasma etching.
- laser-based methods carbon dioxide laser, excimer laser, UV-YAG laser, etc. are preferred because fine via holes can be formed without deteriorating the characteristics of the electric insulating layer.
- the surface of the electric insulating layer is oxidized and roughened in order to enhance the adhesiveness to the conductor layer, and is adjusted to a desired surface roughness.
- the surface roughness Ra of the electric insulating layer is 0.1 nm or more and less than 400 nm, preferably 1 nm or more and 300 nm or less, more preferably 10-200 nm.
- the surface of the electrical insulating layer may be brought into contact with an oxidizing compound.
- the oxidizing compound include known compounds having oxidizing ability such as inorganic peroxides and organic peroxides; gases; In particular, it is preferable to use an inorganic peroxide or an organic peroxide since the surface roughness of the electric insulating layer can be easily controlled.
- Examples of the inorganic peroxidation compound include permanganate, chromic anhydride, dichromate, chromate, persulfate, activated manganese dioxide, osmium tetroxide, hydrogen peroxide, and periodate. And organic peroxides such as dicumyl peroxide, otatanyl peroxide, m-chloroperbenzoic acid and peracetic acid.
- the polymer soluble in the solution of the oxidizing compound is added to the curable resin composition before forming the electric insulating layer.
- Liquid epoxy resin, etc. Liquid epoxy resin, etc.
- inorganic fillers calcium carbonate, silica, etc.
- Polymers and inorganic fillers soluble in the solution of the oxidizing compound as described above are optionally added to the curable resin composition of the present invention, such as a flame retardant aid, a heat stabilizer, and a dielectric.
- Property modifier, toughness It can be used as a part of a sexual agent.
- the surface of the electric insulating layer is usually washed with water in order to remove the oxidizing compound. If a substance that cannot be washed with water alone is attached, the substance is further washed with a dissolvable cleaning solution, or brought into contact with another compound to make it a water-soluble substance and the power is also washed with water. You can also. For example, when an alkaline aqueous solution such as an aqueous solution of potassium permanganate or an aqueous solution of sodium permanganate is brought into contact with the electrical insulating layer, the aqueous solution of hydroxyamine and sulfate is removed to remove the generated manganese dioxide film. The neutralization reduction treatment is performed with an acidic aqueous solution such as a mixed solution.
- a conductor layer is formed on the surface of the electric insulating layer and the inner wall surface of the via hole by plating or the like on the laminate.
- a method of forming the conductor layer for example, a method of forming a metal thin film on an electrical insulating layer by plating or the like, and then growing the metal layer by thickening is used.
- a catalyst nucleus such as silver, zinc, cobalt, or the like is formed on the electric insulating layer before the metal thin film is formed on the surface of the electric insulating layer. It is common to attach them.
- electroless plating solution used in the electroless plating method a known autocatalytic electroless plating solution may be used, and a metal species, a reducing agent species, and a complexing agent contained in the plating solution may be used.
- the species, hydrogen ion concentration, dissolved oxygen concentration and the like are not particularly limited.
- electroless nickel using sodium hypophosphite as a reducing agent Phosphor plating solution electroless nickel plating solution using dimethylamine borane as a reducing agent
- Electroless palladium plating solution Electroless palladium using sodium hypophosphite as a reducing agent Phosphor plating solution
- Electroless plating solution such as gold plating solution; electroless silver plating solution; electroless nickel-cobalt phosphorous plating solution using sodium hypophosphite as a reducing agent can be used.
- the surface of the substrate may be brought into contact with a protective agent to perform a protective treatment.
- a metal thin film is formed on the surface of the electrical insulating layer, the side surface of the inner layer substrate, and the inner wall surface of the via hole by the electroless plating method.
- the metal thin film on the electrical insulating layer is passed through Always perform thickening.
- thick plating for example, a plating resist pattern is formed on a metal thin film according to a conventional method, and then plating is grown thereon by wet plating, such as electrolytic plating, and then the resist is removed.
- the metal thin film is etched into a pattern by etching to form a conductor layer.
- the conductor layer usually consists of a patterned metal thin film and plating grown thereon.
- the metal thin film can be heated to improve adhesion.
- the heating temperature is usually 50-350 ° C, preferably 80-250 ° C. Heating may be performed under pressurized conditions. Examples of a method of applying pressure at this time include a physical pressurizing method such as a hot press machine or a pressurized heating roll machine.
- the applied pressure is usually 0.1-20 MPa, preferably 0.5-lOMPa. Within this range, high adhesion between the metal thin film and the electric insulating layer can be ensured.
- the uncured or semi-cured resin molded body is attached to the top and bottom conductor layers of the inner layer board on which the primer layer is formed. Further, by repeating the above-described steps of curing, roughening, plating, and etching, further multilayering is possible.
- a part of the conductor layer may be a metal power supply layer, a metal ground layer, and a metal shield layer.
- the circuit board of the present invention can be used as a printed wiring board for mounting semiconductor elements such as a CPU and a memory, and other mounting components in electronic devices such as computers and mobile phones.
- semiconductor elements such as a CPU and a memory
- other mounting components in electronic devices such as computers and mobile phones.
- those having fine wiring are suitable as high-density printed wiring boards, high-speed computers, and wiring boards for portable terminals used in high-frequency ranges.
- the surface roughness Ra was evaluated using a non-contact optical surface shape measuring device (Keyence Color Laser Microscope VK-8500) in a rectangular area of 20 m x 20 m. Measure the location. The average was defined as the surface roughness Ra of the surface of the electric insulating layer or the conductor layer.
- a first conductive layer 2 On both sides of the core substrate 1, a first conductive layer 2, a first electrical insulating layer 3, a second conductive layer 4, and a second electrical insulating layer 5 And in the second conductor layers 2 and 4]]?
- the microstrip wiring pattern specified in 5'5 (2) of Jachi-1101 was formed.
- the signal line width was 73 ⁇ m
- the signal line thickness was 18 ⁇ m
- the signal line length was 150 mm
- the evaluation substrate was subjected to TDR (Time Domain Reflectometry) evaluation.
- a first conductive layer 2 On both sides of the core substrate 1, a first conductive layer 2, a first electrical insulating layer 3, a second conductive layer 4, and a second electrical insulating layer 5 And in the second conductor layers 2 and 4]]?
- the microstrip wiring pattern specified in 5'5 (2) of Jachi-1101 was formed.
- the signal line width was 73 ⁇ m
- the signal line thickness was 18 ⁇ m
- the signal line length was 150 mm
- the value calculated by the following equation 1 is less than ⁇ 1.0% ⁇ , ⁇ 1.0% or more ⁇ 2.0 %Less than 7 is rated as 2., ⁇ 2.0% or more and less than ⁇ 5.0% is rated as ⁇ , and ⁇ 5.0% or more is rated as X.
- the obtained varnish was coated on a 300 mm square 75 ⁇ m thick polyethylene naphthalate film, and then dried in a nitrogen oven at 80 ° C for 10 minutes. A film-shaped molded article with a support having a thickness of 40 m was obtained.
- a core substrate obtained by impregnating a glass cloth with a varnish containing grease and copper on both sides) was prepared, and this double-sided substrate was immersed in a 5 wt% aqueous sulfuric acid solution at 25 ° C for 1 minute. After that, the substrate was washed with pure water to obtain an inner substrate.
- the surface roughness Ra of the first conductor layer 2 was 70 nm. Then, 2, 4, 6-trimercapto - S- 0.
- the film-shaped molded product with the support obtained above was superimposed on the inner layer substrate so that the resin molded product surface was inside.
- This was used as the primary press, and the pressure was reduced to 200 Pa using a vacuum laminator equipped with heat-resistant rubber press plates on the upper and lower sides, followed by thermocompression bonding at a temperature of 110 ° C and a pressure of 1. OM Pa for 60 seconds.
- the pressure was reduced to 200 Pa, and the temperature was reduced to 140 ° C and the pressure was set to 1. It was thermocompression bonded for seconds. Then, only the polyethylene naphthalate film was peeled off to obtain a resin layer on the inner layer substrate.
- the inner layer substrate on which the finger layer was formed was immersed in an aqueous solution adjusted so that 1 (2 aminoethyl) 2-methylimidazole was 1.0% by weight at 30 ° C. for 10 minutes, Next, after immersing in water at 25 ° C for 1 minute, excess solution was removed with an air knife. This was left in a nitrogen oven at 60 ° C. for 30 minutes and at 170 ° C. for 60 minutes to obtain a circuit board having the first electrically insulating layer 3 formed on the inner layer board.
- the above-described circuit board with via holes was placed in a permanganate treatment bath prepared so that the concentration of DS250A (manufactured by Ebara Ujilight Co., Ltd.) was 6 OgZl and the concentration of DS150B (manufactured by Ebara Ujilight Co., Ltd.) was 70 mlZl. C.
- the sample was immersed in C for 10 minutes, and further washed in a 45 ° C water bath for 1 minute.
- the circuit board was immersed in a water tank for 1 minute, and further immersed in another water rub for 1 minute to perform water washing.
- the substrate was immersed in a neutralization reducing bath prepared so that the concentration of DS350 (manufactured by Ebara Ujilite Co., Ltd.) was 5 OmlZ liter and sulfuric acid was 50 mlZ liter at 45 ° C. for 5 minutes to perform a neutralization reduction treatment.
- the circuit board which had been washed with water in the same manner as described above, was adjusted to have a PC65H (manufactured by Ebara Ujilight Co., Ltd.) concentration of 250 mlZl and a SS400 (manufactured by Ebara Ujilight Co., Ltd.) concentration of 0.8 mlZl.
- the circuit board obtained in this way was PB556MU (manufactured by Ebara Ujilight Co., Ltd.) with a capacity of 20 ml / liter, PB556A (manufactured by Ebara Ujilight Co., Ltd.) with a capacity of OmlZl, and PB566B (manufactured by Ebara Ujilight Co., Ltd.) with a capacity of 60 mlZl. , PB566C (manufactured by EBARA Uzilite Co., Ltd.) was immersed in an electroless copper plating bath prepared to 60 ml Z liter at 35 ° C for 4.5 minutes to perform electroless plating.
- PB556MU manufactured by Ebara Ujilight Co., Ltd.
- PB556A manufactured by Ebara Ujilight Co., Ltd.
- OmlZl a capacity of OmlZl
- PB566B manufactured by Ebara Ujilight
- the circuit board on which the metal thin film layer was formed by the electroless plating treatment was further washed with water as described above.
- AT-21 manufactured by Uemura Kogyo Co., Ltd.
- a water-proofing solution prepared so as to have a volume of 10 ml at room temperature for 1 minute, further washed with water in the same manner as described above, dried, and water-proofed. did.
- the circuit board that had been subjected to the heat-proof treatment was heat-treated at 170 ° C for 30 minutes.
- a dry film of a commercially available photosensitive resist is thermocompressed and adhered to the surface of the circuit board after the heat treatment, and then, in the next step V, a mask of a pattern corresponding to the characteristic impedance evaluation pattern is brought into close contact with the dry film and exposed. After that, development was performed to obtain a resist pattern.
- the resist is removed by immersion in a 50 ml Z liter solution of sulfuric acid at 25 ° C for 1 minute, and electrolytic copper plating is applied to the non-resist-forming portions to form an 18 m thick electrolytic copper plating film.
- electrolytic copper plating is applied to the non-resist-forming portions to form an 18 m thick electrolytic copper plating film.
- the resist pattern on the substrate is removed using a stripping solution, and an etching process is performed with a mixed solution of cupric chloride and hydrochloric acid, so that the metal thin film and the electrolytic copper plating film are formed on the circuit board 1.
- a second conductive layer 4 was formed.
- the surface roughness (that is, arithmetic average roughness) Ra of the first electrical insulating layer 3 in a portion where the second conductive layer 4 was not provided on the circuit board was 100 nm.
- a multilayer circuit board B with a wiring pattern of four layers on both sides was obtained in the same manner as in Example 1 except that the surface of the first electrical insulating layer 3 of Example 1 was immersed in a permanganate treatment bath for 30 minutes.
- the surface roughnesses Ra of the first conductor layer 2 and the first electric insulating layer 3 measured in the step of obtaining the substrate were 70 nm and 350 nm, respectively.
- the evaluation results are shown in Table 1 below
- a multilayer circuit board C with a wiring pattern of four layers on both sides was obtained in the same manner as in Example 1 except that the varnish containing fine magnetic substance powder was used.
- the surface roughnesses Ra of the first conductor layer 2 and the first electric insulating layer 3 measured in the step of obtaining the substrate were 70 nm and 100 nm, respectively.
- the relative permittivity of the first and second electric insulating layers 3 and 5 was 2.7, and the relative magnetic permeability was 2.7. Table 1 shows the evaluation results.
- a multilayer circuit board D with a wiring pattern of four layers on both sides was obtained in the same manner as in Example 1 except that the surface of the first conductive layer 2 of Example 1 was microetched by contact with an organic acid.
- the surface roughness Ra of the first conductive layer 2 measured in the step of obtaining the substrate was 1.5 / ⁇ , and the surface roughness Ra of the first electric insulating layer 3 was 100 nm.
- the evaluation results are shown in Table 1 below.
- Comparative Example 2 A multilayer circuit board E having a wiring pattern of four layers on both sides in the same manner as in Comparative Example 1 except that the surface of the first electrical insulating layer 3 of Comparative Example 1 was immersed in a permanganate treatment bath for 60 minutes. Got. The surface roughness Ra of the first conductor layer 2 measured in the step of obtaining the substrate was 1.5 / ⁇ , and the surface roughness Ra of the first electric insulating layer 3 was 500 nm. The evaluation results are shown in Table 1 below.
- n-Butinole acetylate 26 Polymerization of 5.2 ⁇ styrene and 26.8 ⁇ accinoleic acid in a 7: 3 (weight ratio) mixed solvent of ethyl methyl ketone and ethanol in the presence of azobis isobutyl mouth-tolyl Thus, an acrylic polymer was obtained. To this, 0.23 parts of idroquinone was added and a small amount of air was blown in. Then, 15 parts of N, N-dimethylhenzylamine and 147 parts of chrysicyl methacrylate were added to the mixture at a temperature of 77 ° C for 10 minutes. After holding for a time, a carboxyl-containing base polymer having a weight average molecular weight of about 30,000, an acid value of 225 mgZg, and an unsaturated group content of 0.9 mol% / Kg was obtained.
- Methylethyl ketone was added to this composition, the viscosity at 25 ° C measured by a BM type viscometer was adjusted to about 700 cps, and a fine filter made of Teflon (registered trademark) having a pore diameter of 50 m was used. After filtration, a resin varnish was obtained.
- a multilayer circuit board F was obtained in the same manner as in Comparative Example 2 except that this resin varnish was used instead of the varnish used in Comparative Example 2.
- the surface roughness Ra of the first conductor layer 2 measured in the step of obtaining the substrate was 1.5 m, and the surface roughness Ra of the first electric insulating layer 3 was 4. Table 1 shows the evaluation results.
- the circuit boards according to Examples 1 to 3 of the present invention differ in the pulse reflection characteristics (TDR) and the pulse passage characteristics (TDT) according to Comparative Examples 1 to 3. It turned out that each was superior.
- the first electric insulating layer 3 or the second electric insulating layer 5 is made of a material in consideration of its relative permittivity ⁇ r and relative magnetic permeability / zr
- the third embodiment shows that the specific impedance can be increased, thereby reducing crosstalk and radiation noise. That is, by forming at least a part of the first or second electric insulating layer 3 or 5 with a material satisfying the relationship of ⁇ r ⁇ / zr, crosstalk and radiation noise can be reduced.
- the first or second electric insulating layer 3 or 5 contains a synthetic resin and a magnetic substance, and the synthetic resin is an epoxy resin, a phenol resin, a polyimide resin, a polyester resin, a fluorine resin.
- Modified polyether ether resin bismaleide 'triazine resin, modified prephenylene oxide resin, silicone resin, acrylic resin, benzocyclobutene resin, polyethylene naphthalate resin, cycloolefin resin, and polyolefin Group strength composed of resin It is desirable that the resin be formed by at least one selected resin.
- the circuit board and the method of manufacturing the same according to the present invention are less likely to cause crosstalk and radiated noise, and therefore, include a circuit board for an electronic device, an electronic device using the circuit board, and Ideal for manufacturing.
Abstract
Description
Claims
Priority Applications (2)
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US10/594,599 US20080029476A1 (en) | 2004-03-31 | 2005-02-24 | Circuit Board And Manufacturing Method Thereof |
JP2006511912A JPWO2005099328A1 (ja) | 2004-03-31 | 2005-02-24 | 回路基板及びその製造方法 |
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JP2004108297 | 2004-03-31 | ||
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US (1) | US20080029476A1 (ja) |
JP (1) | JPWO2005099328A1 (ja) |
KR (1) | KR20070007173A (ja) |
CN (1) | CN100546438C (ja) |
WO (1) | WO2005099328A1 (ja) |
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JP2007126605A (ja) * | 2005-11-07 | 2007-05-24 | Sumitomo Bakelite Co Ltd | 樹脂組成物、積層体、配線板および配線板の製造方法 |
JP2008082712A (ja) * | 2006-09-25 | 2008-04-10 | Gifu Univ | 圧力センサ素子 |
EP2048919A1 (en) * | 2006-06-30 | 2009-04-15 | Shin-Etsu Polymer Co. Ltd. | Noise suppressing wiring member and printed wiring board |
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JP2010532924A (ja) * | 2007-07-12 | 2010-10-14 | 巨擘科技股▲ふん▼有限公司 | 多層基板及びその製造方法 |
JP2011023381A (ja) * | 2009-07-13 | 2011-02-03 | Nippon Zeon Co Ltd | 積層モジュール |
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- 2005-02-24 KR KR1020067022705A patent/KR20070007173A/ko not_active Application Discontinuation
- 2005-02-24 WO PCT/JP2005/003038 patent/WO2005099328A1/ja active Application Filing
- 2005-02-24 US US10/594,599 patent/US20080029476A1/en not_active Abandoned
- 2005-02-24 CN CNB2005800176629A patent/CN100546438C/zh not_active Expired - Fee Related
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JP2000058373A (ja) * | 1998-08-05 | 2000-02-25 | Tdk Corp | 電子部品 |
JP2001160689A (ja) * | 1999-12-02 | 2001-06-12 | Nippon Zeon Co Ltd | 多層回路基板 |
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Cited By (12)
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JP2007126605A (ja) * | 2005-11-07 | 2007-05-24 | Sumitomo Bakelite Co Ltd | 樹脂組成物、積層体、配線板および配線板の製造方法 |
EP2048919A1 (en) * | 2006-06-30 | 2009-04-15 | Shin-Etsu Polymer Co. Ltd. | Noise suppressing wiring member and printed wiring board |
EP2048919A4 (en) * | 2006-06-30 | 2010-01-06 | Shinetsu Polymer Co | NOISE REDUCTION WIRE STRUCTURE AND CONDUCTOR PLATE |
US8134084B2 (en) | 2006-06-30 | 2012-03-13 | Shin-Etsu Polymer Co., Ltd. | Noise-suppressing wiring-member and printed wiring board |
JP2008082712A (ja) * | 2006-09-25 | 2008-04-10 | Gifu Univ | 圧力センサ素子 |
JP2010532924A (ja) * | 2007-07-12 | 2010-10-14 | 巨擘科技股▲ふん▼有限公司 | 多層基板及びその製造方法 |
KR100948643B1 (ko) | 2007-10-26 | 2010-03-24 | 삼성전기주식회사 | 인쇄회로기판 및 그 제조방법 |
JP2011023381A (ja) * | 2009-07-13 | 2011-02-03 | Nippon Zeon Co Ltd | 積層モジュール |
CN102036465B (zh) * | 2009-09-24 | 2013-01-23 | 联致科技股份有限公司 | 复合基板结构 |
JP2020136314A (ja) * | 2019-02-13 | 2020-08-31 | 日立化成株式会社 | 配線基板の製造方法 |
JP2020136399A (ja) * | 2019-02-15 | 2020-08-31 | 日立化成株式会社 | 配線基板の製造方法 |
JP7326761B2 (ja) | 2019-02-15 | 2023-08-16 | 株式会社レゾナック | 配線基板の製造方法 |
Also Published As
Publication number | Publication date |
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JPWO2005099328A1 (ja) | 2007-08-16 |
CN100546438C (zh) | 2009-09-30 |
CN1961622A (zh) | 2007-05-09 |
US20080029476A1 (en) | 2008-02-07 |
KR20070007173A (ko) | 2007-01-12 |
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