JP4929634B2 - Metal foil with adhesive layer and metal-clad laminate - Google Patents

Description

  The present invention relates to a metal foil with an adhesive layer and a metal-clad laminate.

  Mobile communication devices such as mobile phones, base station equipment, network-related electronic devices such as servers and routers, and large computers are required to transmit and process large amounts of information with low loss and high speed. Yes. In order to meet such demands, the frequency of electrical signals handled on a printed wiring board mounted on the apparatus as described above is increasing. However, the higher the frequency is, the more easily the electric signal is attenuated. Therefore, the printed wiring board used in these fields needs to further reduce the transmission loss.

  In order to obtain a printed wiring board with low transmission loss, conventionally, a thermoplastic resin material containing a fluorine-based resin having a low relative dielectric constant and dielectric loss tangent is used as a substrate material for the printed wiring board. However, since a fluorine-based resin generally has a high melt viscosity and a relatively low fluidity, it is necessary to set high-temperature and high-pressure conditions during press molding. Moreover, as a printed wiring board material used for the above-mentioned communication equipment, network-related electronic equipment, large computers, etc., processability, dimensional stability, and adhesion to metal plating are insufficient.

  Therefore, resin compositions containing triallyl cyanurate and triallyl isocyanurate shown in Patent Documents 1 to 3, which are thermosetting resin compositions having a low relative dielectric constant and dielectric loss tangent, Patent Documents 1 and 2 Resin composition containing polybutadiene shown in 4 and 5, thermosetting polyphenylene ether provided with radical crosslinkable functional group such as allyl group shown in Patent Document 6 and triallyl cyanurate And a method of using a resin composition containing triallyl isocyanurate as a raw material for dielectric materials such as the above-mentioned electronic devices has been proposed. According to these patent documents, generally, the cured resin does not have many polar groups, so that it is possible to reduce transmission loss.

  However, in recent years, a resin having a low dielectric constant and a low dielectric loss tangent as described in Patent Documents 1 to 6 is used as a dielectric material, and only a reduction in electric signal transmission loss in an insulating layer (dielectric layer) has been achieved in recent years. This is inadequate as a measure for further increasing the frequency of electrical signals. In other words, electrical signal transmission loss is classified into loss due to insulating layer (dielectric loss) and loss due to conductive layer (conductor loss). Recently, not only reduction of dielectric loss but also conductor loss The need for reducing the power consumption is not negligible. In particular, in most printed wiring boards (multilayer wiring boards) that have been put into practical use in recent years, the thickness of the insulating layer disposed between the signal layer and the ground layer, which are conductive layers, is relatively thin, 200 μm or less. When a resin exhibiting a certain low dielectric constant and dielectric loss tangent is used as the material of the insulating layer, the conductor loss rather than the dielectric loss is dominant as the transmission loss of the entire wiring board.

Further, Patent Documents 7 and 8 intend to provide a laminated board having excellent high-frequency characteristics, good heat resistance, peel strength, and electrical characteristics, and having a smooth manufacturing process, and a manufacturing method thereof. Then, a means for obtaining a copper-clad laminate by laminating a thermosetting prepreg such as a vinyl curable polybutadiene resin and a copper foil to which polybutadiene modified with epoxy, maleic acid, carboxylic acid or the like is attached is proposed. ing.
Japanese Examined Patent Publication No. 6-69746 Japanese Patent Publication No. 7-47689 JP 2002-265777 A Japanese Patent Publication No.58-21925 JP-A-10-117052 Japanese Patent Publication No. 6-92533 JP 54-74883 A JP 55-86744 A

  As a method for reducing the conductor loss, a metal foil having a small surface unevenness on the roughened surface (hereinafter referred to as “M surface”) side, which is an adhesive surface between the conductive layer and the insulating layer, specifically, M There is a method of using a metal-clad laminate using a metal foil (hereinafter referred to as “low profile foil”) having a surface roughness (ten-point average roughness; Rz) of 4 μm or less.

  Therefore, the present inventors, including those described in Patent Documents 1 to 6, low dielectric constant, low dielectric loss tangent resin cured by polymerization of vinyl group and allyl group and the above-mentioned low profile foil The printed wiring board used together was examined in detail. As a result, such a printed wiring board has a low polarity of the insulating layer, and the anchor effect due to the unevenness of the M surface of the metal foil is reduced, so that the adhesive force (bonding force) between the insulating layer and the conductive layer is weakened. It has been found that easy delamination occurs between these layers. Such peeling becomes prominent when the printed wiring board is heated (particularly when heated after moisture absorption). Therefore, the present inventors have clarified that when the above-described resin is used as a dielectric material, there is a limit to achieving a sufficiently low transmission loss by employing a low profile foil.

  In addition, by applying the means described in Patent Documents 7 and 8, when a printed wiring board is produced using a low profile copper foil having an M-plane Rz of 4 μm or less, a sufficiently high copper foil peeling strength is obtained. The present inventors have found that heat resistance (particularly heat resistance during moisture absorption) is reduced.

  Therefore, the present invention has been made in view of the above circumstances, and can form a printed wiring board that can sufficiently reduce transmission loss, particularly in a high frequency band, and that has a sufficiently strong adhesive force between an insulating layer and a conductive layer. An object is to provide a metal foil with an adhesive layer and a metal-clad laminate produced using the metal foil with an adhesive layer.

  The present inventors have developed a low-roughness metal foil, such as a low-profile foil, for thermosetting resins having a low dielectric constant, such as polybutadiene, triallyl isocyanurate and functionalized polyphenylene ether, as dielectric materials for the insulating layer. As a result of intensive studies to solve the above problems even when used in combination, the present invention has been completed.

The metal foil with an adhesive layer of the present invention is a metal foil with an adhesive layer comprising a metal foil and an adhesive layer provided on the main surface of the metal foil, wherein the adhesive layer comprises (A) component; an oxirane ring. or having an oxetane ring and a compound having an ethylenically unsaturated bond, (B) component; all SANYO comprising a curable resin composition comprising a novolak type phenol resin having a triazine ring, a metal foil The ten-point average roughness (Rz) of the main surface is 4 μm or less .

Moreover, the metal foil with an adhesive layer of the present invention is a metal foil with an adhesive layer comprising a metal foil and an adhesive layer provided on the main surface of the metal foil, wherein the adhesive layer comprises the component (A); A curable resin containing a compound having an oxirane ring or an oxetane ring and having an ethylenically unsaturated bond, component (B); a novolak-type phenol resin having a triazine ring, and component (C); a polymer component all SANYO comprising the composition, ten-point average roughness of the main surface of the metal foil (Rz) is 4μm or less.

  When the adhesive layer according to the present invention is used, a sufficiently high metal foil peeling strength can be ensured even when a metal foil having a low surface roughness such as a low profile foil is used in combination with the above dielectric material. it can. Therefore, when the metal foil with the adhesive layer of the present invention is used, a transmission loss in a high frequency band can be sufficiently reduced, and a printed wiring board with sufficiently strong adhesive force between the insulating layer and the conductive layer can be formed.

  In addition, high-frequency circuits used in electronic devices such as those described above require good impedance control as well as low transmission loss. To achieve this, the conductor pattern width in the signal layer is formed. Improvement of accuracy when doing so is an important point. When a metal foil having a small surface roughness such as a low profile foil can be used, the etching accuracy can be improved, which is effective for improving the accuracy in forming the conductor pattern width and for further fine patterning of the circuit. The metal foil with an adhesive layer of the present invention uses a low profile foil as the metal foil, and even if a resin having a low dielectric constant and a low dielectric loss tangent is used for the insulating resin layer, sufficient adhesive strength is provided between the insulating layer and the metal foil. Therefore, good impedance control can be realized.

  The layer obtained by curing the adhesive layer according to the present invention (hereinafter referred to as “cured layer”) also functions as a part of the insulating layer of the printed wiring board. The portion constituting the insulating layer other than the cured layer is expressed as “insulating resin layer” and is distinguished from the cured layer.

  The reason why the metal foil with an adhesive layer of the present invention can achieve the above-mentioned object has not been clarified in detail at present, but the present inventors speculate as follows. However, the factor is not limited to this.

  An epoxy resin composition using a novolac type phenol resin having a triazine ring in the molecule (hereinafter referred to as “triazine ring-containing novolak type phenol resin”) as a curing agent is an epoxy resin composition using another epoxy curing agent. The adhesion with the conductor layer is better. However, the phenol resin has low compatibility and extremely low reactivity with the low dielectric constant resins such as the vinyl curing type and the allyl curing type as described above. For this reason, a cured layer containing only the phenol resin as a constituent material cannot exhibit sufficient peel strength between the layer using these resins (insulating resin layer).

  In the printed wiring board produced using the metal foil with an adhesive layer of the present invention, the component (A) enhances the compatibility with the low dielectric constant resin. That is, the compound having an oxirane ring or oxetane ring as the component (A) and having an ethylenically unsaturated bond undergoes a polymerization reaction with the component (B) in the adhesive layer, and at the same time, is a constituent material of the adjacent insulating resin layer. It crosslinks with a certain low dielectric constant resin by radical polymerization. Thereby, the hardened layer obtained from the adhesive layer and the insulating resin layer are almost integrated. As a result, the hardened layer not only has a sufficiently high adhesive force with the conductor layer, but can also improve the breaking strength inside the hardened layer and in the vicinity of the interface between the hardened layer and the insulating resin layer. Even with the resin layer, it has a sufficiently high adhesive force. When the polymer component (C) is used, the toughness of the adhesive layer and the adhesiveness with the conductor layer can be further improved.

Adhesive layer-attached metal foil of the present invention, as a functional group having an ethylenically unsaturated bond in the component (A), a vinyl group, an allyl group, acrylic group _(CH 2 = CHCOO-) and a methacrylic group _(CH 2 = CCH ₃ It preferably has one or more groups selected from the group consisting of (COO-).

The metal foil with an adhesive layer of the present invention is curable when the component (A) is an epoxy compound having a polybutadiene structure and an oxirane ring, that is, an epoxy compound having an oxirane ring and further having a polybutadiene structure. From the viewpoint of further improvement and compatibility with the insulating resin layer, it is preferable. Such component (A) is, for example, from the group consisting of a phenolic hydroxyl group, an alcoholic hydroxyl group, a carboxyl group, an amide group, an amino group, an imino group (—NH—) and a group represented by the following formula (III). It can be obtained by reacting a modified polybutadiene having one or more selected groups with a compound having two or more oxirane rings.

  In the metal foil with an adhesive layer of the present invention, the epoxy compound in the curable resin composition constituting the adhesive layer preferably has a vinyl group at its side chain or terminal.

Moreover, it is preferable that the said epoxy compound has a structural unit represented by the following general formula (1), (2) or (3), or the following general formula (5).

Here, in Formula (1), n shows the integer of 2-8, and the sum total of n and m shows the integer of 10-10000. In Formula (2), R ¹ and R ² each independently represent a hydrogen atom or a hydroxyl group, and R ³ represents an acrylic group or an oxiranyl group.

In formula (3), R ⁴ represents a group represented by the following formula (4), i represents an integer of 0 to 100, and the sum of i and j represents an integer of 10 to 10,000.

  In formula (5), p and u each independently represent an integer of 1 to 10,000, q represents an integer of 1 to 100, r and s each independently represents an integer of 0 to 100, and t represents An integer of 1 to 10,000 is shown. However, either r or s represents an integer of 1 or more.

  In the metal foil with an adhesive layer of the present invention, the blending ratio of the component (B) is 0.5 to 200 parts by mass with respect to 100 parts by mass of the component (A) from the viewpoint of further exerting the effects of the present invention described above. It is preferable.

  In the metal foil with an adhesive layer of the present invention, from the viewpoint of further improving the toughness of the adhesive layer and the adhesiveness to the conductor layer, the polymer component (C) is preferably a crosslinked rubber particle, and acrylonitrile butadiene rubber particles More preferably, it is composed of at least one particle selected from the group consisting of carboxylic acid-modified acrylonitrile butadiene rubber particles and butadiene rubber-acrylic resin core-shell particles.

  From the same viewpoint, in the metal foil with an adhesive layer of the present invention, the component (C) is preferably composed of a polyvinyl acetal resin and / or a carboxylic acid-modified polyvinyl acetal resin, and is preferably a polyamideimide.

  In the metal foil with an adhesive layer of the present invention, when the component (C) is polyamideimide, the polyamideimide preferably has a structural unit composed of a saturated hydrocarbon. A printed wiring board formed using such a metal foil with an adhesive layer can further enhance the adhesive force between the conductive layer and the insulating layer, and can maintain a high adhesive force even during moisture absorption. Sex can be expressed.

  In the metal foil with an adhesive layer of the present invention, the blending ratio of the component (C) is 0 with respect to a total of 100 parts by mass of the component (A) and the component (B) from the viewpoint of further exerting the effects of the present invention. .5 to 800 parts by mass is preferable.

  The adhesive layer according to the present invention is obtained, for example, by applying a resin varnish containing a curable resin composition and a solvent on the main surface of the metal foil and then volatilizing the solvent, and the thickness of the adhesive layer is 0. .1 to 5 μm is preferable.

  In the metal foil according to the present invention, when the ten-point average roughness (Rz) of the main surface is 4 μm or less, the transmission loss can be further reduced, and the adhesive force between the metal foil and the cured layer is sufficient. Can be maintained at a high level. Here, the ten-point average roughness Rz is a surface roughness in accordance with JIS-B0601-1994.

  The metal-clad laminate of the present invention is obtained by laminating the above-mentioned metal foil with an adhesive layer on at least one surface of an insulating resin film containing an insulating resin so that the adhesive layer of the metal foil with an adhesive layer is in contact with it. It is obtained by obtaining a laminate and heating and pressurizing the laminate.

  According to the present invention, there is provided a metal foil with an adhesive layer capable of sufficiently reducing transmission loss particularly in a high frequency band and capable of forming a printed wiring board having a sufficiently strong adhesive force between an insulating layer and a conductive layer. be able to.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings as the case may be. In the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted. Further, the positional relationship such as up, down, left and right is based on the positional relationship shown in the drawings unless otherwise specified. Further, the dimensional ratios in the drawings are not limited to the illustrated ratios.

A metal foil with an adhesive layer according to a preferred first embodiment of the present invention is a metal foil with an adhesive layer comprising a metal foil and an adhesive layer provided on the main surface of the metal foil, the adhesive layer having an adhesive layer Comprises a curable resin composition containing (A) component; a compound having an oxirane ring or an oxetane ring and having an ethylenically unsaturated bond; and (B) component; a triazine ring-containing novolac type phenol resin. Monodea is, the ten-point average roughness of the main surface of the metal foil (Rz) is 4μm or less. Hereinafter, the curable resin composition constituting the adhesive layer and its components will be described.

((A) component)
The compound having an oxirane ring or oxetane ring as component (A) and having an ethylenically unsaturated bond is not particularly limited as long as it is a compound having an ethylenically unsaturated bond and an oxirane ring or oxetane ring in the molecule. Specific examples include an epoxy compound having an ethylenically unsaturated bond, an oxetane compound having an ethylenically unsaturated bond, and the like, and an epoxy compound having an ethylenically unsaturated bond is preferably used.

  The epoxy compound having such an ethylenically unsaturated bond is not particularly limited as long as it is an epoxy resin having one or more ethylenically unsaturated groups such as a vinyl group, an allyl group, an acrylic group, and a methacryl group. Specifically, a polybutadiene-modified epoxy compound having an ethylenically unsaturated group, an alicyclic epoxy resin having a vinyl group such as 1,2-epoxy-4-vinylcyclohexane, glycidyl methacrylate (GMA), methyl glycidyl methacrylate (M -GMA), 3,4-epoxycyclohexylmethyl acrylate, 3,4-epoxycyclohexylmethyl methacrylate, and other epoxy compounds having an acrylic group or a methacryl group. Among these, a polybutadiene-modified epoxy compound having an ethylenically unsaturated group is preferably used.

  Examples of the polybutadiene-modified epoxy compound include a polybutadiene-modified epoxy compound obtained by epoxidizing a part of an ethylenically unsaturated group of a compound having a 1,2-polybutadiene structure and / or a 1,4-polybutadiene structure (hereinafter referred to as “ Or a phenolic hydroxyl group, alcoholic hydroxyl group, carboxyl group, amide group, amino group, imino group or 2,5-dihydrofuran-2,5-reacting with the oxirane ring. A polybutadiene-modified epoxy compound (hereinafter referred to as “second modified epoxy compound”) obtained by reacting a modified polybutadiene having a group such as a dione-3-yl group and a polyfunctional epoxy compound having two or more oxirane rings. Etc.). Among such compounds, it is particularly preferable to use a polybutadiene-modified epoxy compound having one or more vinyl groups at the terminal or side chain in the molecule.

  Specific examples of the first modified epoxy compound include a compound represented by the general formula (1) or (2) or a compound having a structural unit represented by the general formula (5). Examples of the epoxy compound represented by the formula (1) include BF-1000 (trade name, manufactured by Nippon Soda Co., Ltd.). Examples of the epoxy compound represented by the formula (2) include PB3600 (trade name, manufactured by Daicel Chemical Industries, Ltd.). As the epoxy compound having the structural unit represented by the formula (5), A1005, A1010, A1020 (above, manufactured by Daicel Chemical Industries, Ltd., trade name) and the like are commercially available.

Specific examples of the second modified epoxy compound include an epoxy compound obtained by reacting a polybutadiene having a carboxyl group and a bisphenol A type epoxy resin as represented by the general formula (3). In formula (3), R ⁴ is a group represented by the above formula (4). As such a second modified epoxy compound, EPB-13 (trade name, manufactured by Nippon Soda Co., Ltd.) is commercially available.

  The second modified epoxy compound is a bisphenol A type epoxy resin, a bisphenol F type epoxy resin, a bisphenol S type epoxy resin, a brominated bisphenol A type epoxy resin, a biphenyl type epoxy resin or a phenol novolac type as a polyfunctional epoxy compound. Epoxy resin, cresol novolak type epoxy resin, brominated phenol novolak type epoxy resin, bisphenol A novolak type epoxy resin, naphthalene skeleton containing epoxy resin, aralkylene skeleton containing epoxy resin, biphenyl-aralkylene skeleton epoxy resin, phenol salicylaldehyde novolak type epoxy resin , Lower alkyl group-substituted phenol salicylaldehyde novolak type epoxy resin, dicyclopentadiene skeleton-containing epoxy resin, polyfunctional glycidyl Amine type epoxy resin and a polyfunctional alicyclic epoxy resin may be a polybutadiene-modified epoxy compound obtained by using the.

  Moreover, (A) component which concerns on this embodiment may be used individually by 1 type, and may be used in combination of 2 or more type.

((B) component)
The (B) component triazine ring-containing novolak type phenol resin is a novolak type phenol resin containing a triazine ring in the main chain of the novolak type phenol resin, and may be a cresol novolac type phenol resin having a triazine ring in the molecule. Good.

  The nitrogen content in the molecule of the triazine ring-containing novolak type phenol resin is preferably 10 to 25% by mass, more preferably 12 to 19% by mass, based on the total amount of the resin. If the nitrogen content in the molecule is within this range, the dielectric loss will not increase too much, and when the adhesive aid is used as a varnish, the solubility in the solvent will be appropriate and the remaining amount of undissolved matter will be suppressed. it can. A triazine ring-containing novolak type phenol resin having a number average molecular weight of 500 to 600 is preferable because the above-described effects of the present invention can be more effectively exhibited. These can be used singly or in combination of two or more.

  The triazine ring-containing novolak-type phenol resin is obtained by a conventional method, for example, obtained by reacting phenol, an aldehyde, and a compound having a triazine ring in the molecule under the conditions of pH 5-9. As the compound having a triazine ring in the molecule, melamine, guanamine and derivatives thereof, cyanuric acid and derivatives thereof, and the like can be used. When cresol is used in place of the raw material phenol, a triazine ring-containing cresol novolac type phenol resin is obtained. As the cresol, any of o-cresol, m-cresol and p-cresol can be used.

  As a commercial item of a triazine ring-containing novolak type phenol resin, for example, Dainippon Ink Chemical Co., Ltd. triazine ring-containing novolak phenol resin LA-1356 (nitrogen content: 19% by mass, solid content concentration: 58 to 62% by mass) , Product name). As a commercial item of a triazine ring-containing cresol novolac type phenol resin, for example, a triazine ring-containing cresol novolac type phenol resin phenolite EXB-9829 (Nitrogen content: 18% by mass, trade name) manufactured by Dainippon Ink & Chemicals, Inc. Is mentioned.

  In the thermosetting resin composition that is a constituent material of the adhesive layer according to this embodiment, the blending ratio of the component (B) is in the range of 0.5 to 200 parts by mass with respect to 100 parts by mass of the component (A). Then, it is preferable to set it as 7-80 mass parts, and it is still more preferable to set it as 10-50 mass parts. When the blending ratio of the triazine ring-containing novolak type phenolic resin as the component (B) is less than 0.5 parts by mass, the metal foil or printed wiring board with an adhesive layer obtained by employing the blending ratio of the component (B) However, the toughness of the cured layer and the adhesiveness between the cured layer and the metal foil (conductive layer) tend to decrease. If the amount exceeds 200 parts by mass, the thermosetting property of the adhesive layer and the reactivity between the adhesive layer (cured layer) and the insulating resin layer decrease, so the adhesive layer (cured layer) or the insulating resin layer and the adhesive layer (cured) The heat resistance, chemical resistance and breaking strength in the vicinity of the interface with the layer) tend to decrease.

  In the metal foil with an adhesive layer of the present embodiment, the thermosetting resin composition that is a constituent material of the adhesive layer comprises: (A) an oxirane ring or oxetane ring as a component; and (B) a triazine ring-containing novolac type phenol resin. It is preferable to further contain a curing accelerator having a catalytic function for promoting the reaction. Specifically, examples of the curing accelerator include amine compounds, imidazole compounds, organic phosphorus compounds, alkali metal compounds, alkaline earth metal compounds, quaternary ammonium salts, and the like, but are not limited thereto. Moreover, these hardening accelerators may be used individually by 1 type, and may be used in combination of 2 or more type.

  The blending ratio of the curing accelerator in the thermosetting resin composition can be determined according to the blending ratio of the component (A), and 0.05 to 10 parts by mass with respect to 100 parts by mass of the component (A). It is preferable to do. When a curing accelerator is blended within this numerical range, an appropriate reaction rate is obtained, and the thermosetting resin composition of the adhesive layer becomes more excellent in reactivity and curability. It has better chemical resistance, heat resistance and / or moisture heat resistance.

  Moreover, the thermosetting resin composition that is a constituent material of the adhesive layer according to the present embodiment uses the cross-linking reaction between the components (A) in the adhesive layer and the metal foil with the adhesive layer according to the present embodiment. In order to promote the cross-linking reaction between the compound having an unsaturated bond in the insulating resin layer adjacent to the adhesive layer (cured layer) and the component (A) in the adhesive layer in the printed wiring board formed in this manner, radical polymerization is started. It is preferable to further contain an agent.

  Specifically, as a radical polymerization initiator, dicumyl peroxide, t-butylcumyl peroxide, benzoyl peroxide, cumene hydroperoxide, 2,5-dimethylhexane-2,5-dihydroperoxide, 2, 5-dimethyl-2,5-bis (t-butylperoxy) hexyne-3, di-t-butyl peroxide, α, α′-bis (t-butylperoxy) diisopropylbenzene, 2,5-dimethyl- 2,5-bis (t-butylperoxy) hexane, di-t-butylperoxyisophthalate, t-butylperoxybenzoate, 2,2-bis (t-butylperoxy) butane, 2,2-bis (T-butylperoxy) octane, 2,5-dimethyl-2,5-di (benzoylperoxy) hexane, bis (t -Butylperoxy) isophthalate, isobutyryl peroxide, di (trimethylsilyl) peroxide, trimethylsilyltriphenylsilyl peroxide and other peroxides, 2-hydroxy-2-methyl-1-phenyl-propan-1-one, Examples include, but are not limited to, 1- (4-isopropylphenyl) -2-hydroxy-2-methylpropan-1-one, benzoin methyl ether, methyl-o-benzoylbenzoate, and the like. Moreover, these radical polymerization initiators may be used individually by 1 type, and may be used in combination of 2 or more type.

  The blending ratio of the radical polymerization initiator in the thermosetting resin composition can be determined according to the blending ratio of the component (A), and is 0.5 to 10 parts by mass with respect to 100 parts by mass of the component (A). It is preferable that When a radical polymerization initiator is blended within this numerical range, an appropriate reaction rate can be obtained, and the thermosetting resin composition of the adhesive layer becomes more excellent in reactivity and curability. The breaking strength and the conductor peeling strength are increased, and the chemical resistance, heat resistance and moisture heat resistance are improved.

  In addition, the thermosetting resin composition, which is a constituent component of the adhesive layer according to the present embodiment, has heat resistance and adhesiveness when various additives such as flame retardants and fillers are used as printed wiring boards as necessary. Further, it may be further blended in a blending amount within a range that does not deteriorate the properties such as moisture absorption resistance.

  Although it does not specifically limit as said flame retardant, Flame retardants, such as a bromine type | system | group, a phosphorus type | system | group, and a metal hydroxide, are used suitably. More specifically, brominated flame retardants include brominated epoxy resins such as brominated bisphenol A type epoxy resin and brominated phenol novolac type epoxy resin, hexabromobenzene, pentabromotoluene, ethylenebis (pentabromophenyl). , Ethylenebistetrabromophthalimide, 1,2-dibromo-4- (1,2-dibromoethyl) cyclohexane, tetrabromocyclooctane, hexabromocyclododecane, bis (tribromophenoxy) ethane, brominated polyphenylene ether, brominated Brominated flame retardants such as polystyrene and 2,4,6-tris (tribromophenoxy) -1,3,5-triazine, tribromophenyl maleimide, tribromophenyl acrylate, tribromophenyl methacrylate, tetrabromide Bisphenol A dimethacrylate, unsaturated double bonds brominated reactive flame retardants containing such pentabromobenzylacrylate and brominated styrene.

  Phosphorus flame retardants include aromatic phosphorus such as triphenyl phosphate, tricresyl phosphate, trixylenyl phosphate, cresyl diphenyl phosphate, cresyl di-2,6-xylenyl phosphate and resorcinol bis (diphenyl phosphate) Acid esters, phosphonic acid esters such as divinyl phenylphosphonate, diallyl phenylphosphonate and bis (1-butenyl) phenylphosphonate, phenyl diphenylphosphinate, methyl diphenylphosphinate, 9,10-dihydro-9-oxa-10- Phosphinates such as phosphaphenanthrene-10-oxide derivatives, phosphazene compounds such as bis (2-allylphenoxy) phosphazene and dicresylphosphazene, melamine phosphate, melamine pyrophosphate, Melamine phosphate, melam polyphosphate, phosphorus-based flame retardant ammonium polyphosphate and red phosphorus and the like. Examples of the metal hydroxide flame retardant include magnesium hydroxide and aluminum hydroxide.

  The above flame retardants may be used alone or in combination of two or more.

  The blending ratio of the flame retardant in the thermosetting resin composition according to the present embodiment is not particularly limited, but is 5 to 150 mass with respect to 100 mass parts of the total amount of the (A) component and the (B) component. Part, preferably 5 to 80 parts by weight, more preferably 5 to 60 parts by weight. If the blending ratio of the flame retardant is less than 5 parts by mass, the flame resistance tends to be insufficient, and if it exceeds 100 parts by mass, the heat resistance of the cured adhesive layer tends to decrease.

  The above-mentioned filler is not particularly limited, but usually an inorganic filler is preferably used. Examples of the inorganic filler include alumina, titanium oxide, mica, silica, beryllia, barium titanate, titanate. Potassium, strontium titanate, calcium titanate, aluminum carbonate, magnesium hydroxide, aluminum hydroxide, aluminum silicate, calcium carbonate, calcium silicate, magnesium silicate, silicon nitride, boron nitride, baked clay clay, talc, Examples thereof include aluminum borate, aluminum borate, and silicon carbide. These fillers may be used individually by 1 type, and may be used in combination of 2 or more type. Moreover, there is no restriction | limiting in particular also about the shape of a filler, and a particle size, Usually, the particle size of 0.01-50 micrometers, Preferably 0.1-15 micrometers is used suitably.

  The blending ratio of the filler in the thermosetting resin composition according to the present embodiment is not particularly limited, but is 1 to 1000 parts by mass with respect to 100 parts by mass of the total amount of the component (A) and the component (B). Is preferable, and 1-800 mass parts is more preferable.

  The thermosetting resin composition that is a constituent material of the adhesive layer according to the present embodiment is a known component (A), component (B), curing accelerator, radical polymerization initiator, and other additives as necessary. It can manufacture by mix | blending and mixing by the method of.

A metal foil with an adhesive layer according to a preferred second embodiment of the present invention is a metal foil with an adhesive layer comprising a metal foil and an adhesive layer provided on the main surface of the metal foil, the adhesive layer having an adhesive layer (A) component; a compound having an oxirane ring or an oxetane ring and having an ethylenically unsaturated bond; (B) component; a triazine ring-containing novolac type phenol resin; (C) component; a polymer component; der made of a curable resin composition containing a is, the ten-point average roughness of the main surface of the metal foil (Rz) is 4μm or less.

  As (A) component and (B) component which concern on this embodiment, the thing similar to the (A) component and (B) component which concerns on the suitable 1st Embodiment of this invention can be used.

((C) component)
The polymer component (C) is preferably a crosslinked rubber particle, and is at least one selected from the group consisting of acrylonitrile butadiene rubber particles, carboxylic acid-modified acrylonitrile butadiene rubber particles, and core-shell particles of butadiene rubber-acrylic resin. It is more preferable to consist of the particles. Thereby, there exists an advantage that the improvement of the adhesive force between an insulating layer and a conductive layer is achieved further.

  Acrylonitrile butadiene rubber particles are obtained by copolymerizing acrylonitrile and butadiene, and partially cross-linking at the stage of copolymerization. Further, at the stage of the copolymerization, carboxylic acid-modified acrylonitrile butadiene rubber particles can be obtained by copolymerizing together carboxylic acids such as acrylic acid and methacrylic acid.

  The core-shell particles of butadiene rubber-acrylic resin are obtained by a two-stage polymerization method in which butadiene particles are polymerized by emulsion polymerization, followed by addition of a monomer that is a raw material for acrylic resin such as acrylic acid ester and acrylic acid. Can do. The size of the particles can be 50 nm to 1 μm as the primary average particle size. You may use these individually by 1 type or in combination of 2 or more types.

  Examples of commercially available products of acrylonitrile butadiene rubber particles include XER-81 (trade name) manufactured by Nippon Synthetic Rubber Co., Ltd. Examples of commercially available products of carboxylic acid-modified acrylonitrile butadiene rubber particles include those manufactured by Nippon Synthetic Rubber Co., Ltd. XER-91 (trade name) may be mentioned. Examples of the core-shell particles of butadiene rubber-acrylic resin include EXL-2655 manufactured by Kureha Chemical Industry Co., Ltd. and AC-3832 (trade name) of Takeda Pharmaceutical Company Limited.

  The component (C) is also preferably composed of a polyvinyl acetal resin and / or a carboxylic acid-modified polyvinyl acetal resin. Thereby, there exists an advantage that the improvement of the adhesive force between an insulating layer and a conductive layer is achieved further.

  Although the kind of polyvinyl acetal resin, the amount of hydroxyl groups, and the amount of acetyl groups are not particularly limited, those having a number average polymerization degree of 1000 to 2500 are preferred. When the number average polymerization degree is within this range, the solder heat resistance can be further ensured, and the viscosity and handleability of the varnish are further improved. Here, the number average degree of polymerization of the polyvinyl acetal resin can be determined from the number average molecular weight of polyvinyl acetate as a raw material (measured using a standard polystyrene calibration curve by gel permeation chromatography).

  Moreover, in addition to or instead of the polyvinyl acetal resin, a carboxylic acid-modified polyvinyl acetal resin obtained by modifying a polyvinyl acetal resin with a carboxylic acid by a conventional method can also be used. As for the carboxylic acid-modified polo vinyl acetal resin, those having a number average polymerization degree of 1000 to 2500 are preferred for the same reason as the polyvinyl acetal resin.

The polyvinyl acetal resin and the carboxylic acid-modified polyvinyl acetal resin may be synthesized by a conventional method, or commercially available products may be obtained. As a commercial item, for example, trade name S REC-1, BX-2, BX-5, BX-55, BX-7, BH-3, BH-S, KS-3Z, KS manufactured by Sekisui Chemical Co., Ltd. -5, KS-5Z, KS-8, KS-23Z, trade names made by Denki Kagaku Kogyo Co., Ltd., electrified butyral 4000-2, 5000A, 6000C, 6000EP, and the like.
These resins can be used alone or in combination of two or more.

  When the above-mentioned crosslinked rubber particles and polyvinyl acetal resin and / or carboxylic acid-modified polyvinyl acetal resin are used in combination as the component (C), the peel strength of the metal foil and the peel strength of the electroless plating after chemical roughening are improved. Therefore, it is more preferable.

  The component (C) is preferably polyamideimide. As a result, it is possible to reduce transmission loss in the high frequency band and improve the adhesion between the insulating layer and the conductive layer at a higher level.

  The polyamideimide is not particularly limited, and examples thereof include polyamideimide synthesized by a so-called isocyanate method by reaction of trimellitic anhydride and aromatic diisocyanate. As a specific example of the isocyanate method for synthesizing polyamideimide, a method in which an aromatic tricarboxylic acid anhydride and a diamine compound having an ether bond are reacted in the presence of an excess of a diamine compound and then a diisocyanate is reacted (for example, Japanese Patent No. 2897186). And a method of reacting an aromatic diamine compound and trimellitic anhydride (for example, a method described in JP-A No. 04-182466).

  A siloxane structure may be introduced into the main chain of polyamideimide. Thereby, the characteristics such as the elastic modulus and flexibility of the cured layer obtained by curing the adhesive layer are improved, and the drying efficiency and the like can be further improved. Polyamideimide having a siloxane structure in the main chain can be synthesized according to the isocyanate method. Specific examples of the synthesis method include a method of polycondensing an aromatic tricarboxylic acid anhydride, an aromatic diisocyanate and a siloxane diamine compound (for example, a method described in JP-A No. 05-009254), an aromatic dicarboxylic acid or A method of polycondensing an aromatic tricarboxylic acid and a siloxane diamine compound (for example, a method described in JP-A-06-116517), a diamine compound having three or more aromatic rings and a mixture containing siloxane diamine and trimellitic anhydride Examples include a method of reacting a mixture containing diimide dicarboxylic acid obtained by reacting with an acid with an aromatic diisocyanate (for example, a method described in JP-A-06-116517). In this embodiment, even if the polyamideimide synthesized by the above-mentioned known method is used, a sufficiently high metal foil peeling strength can be expressed.

  Furthermore, when a polyamideimide having a structural unit composed of saturated hydrocarbon is used, the peel strength of the metal foil is further improved and the moisture resistance is improved, so that high adhesiveness is maintained even after moisture absorption, and higher moisture resistance. Heat resistance is obtained. From the same viewpoint, the structural unit is more preferably a saturated alicyclic hydrocarbon group. Polyamideimides containing saturated alicyclic hydrocarbon groups are more excellent in moisture and heat resistance and exhibit higher Tg.

  Polyamideimide having a structural unit consisting of a saturated hydrocarbon is, for example, derived from an acid halide derived from an imide group-containing dicarboxylic acid obtained by reacting a diamine compound having a saturated hydrocarbon group with trimellitic anhydride, or It can be obtained by reacting with a diamine compound using a condensing agent. Alternatively, a polyamideimide having a structural unit composed of a saturated hydrocarbon can also be obtained by reacting a diisocyanate with an imide group-containing dicarboxylic acid obtained by reacting a diamine compound having a saturated hydrocarbon group with trimellitic anhydride. It is done. Similarly, the polyamide having a structural unit composed of a saturated alicyclic hydrocarbon may be one having a saturated alicyclic hydrocarbon group as the diamine compound in the above synthesis method.

式（６ａ）、（６ｂ）中、Ｌ^１はハロゲン置換されていてもよい炭素数１〜３の２価の脂肪族炭化水素基、スルホニル基、オキシ基、カルボニル基、単結合又は下記式（７ａ）又は（７ｂ）で表される２価の基を示し、Ｌ^２はハロゲン置換されていてもよい炭素数１〜３の２価の脂肪族炭化水素基、スルホニル基、オキシ基又はカルボニル基を示し、Ｒ^５、Ｒ^６及びＲ^７は、それぞれ独立に水素原子、水酸基、メトキシ基、ハロゲン置換されていてもよいメチル基を示す。 As said diamine compound, what is represented by the following general formula (6a) or (6b) is mentioned, for example.

In the formulas (6a) and (6b), L ¹ is an optionally halogenated divalent aliphatic hydrocarbon group having 1 to 3 carbon atoms, a sulfonyl group, an oxy group, a carbonyl group, a single bond, or the following formula ( A divalent group represented by 7a) or (7b), wherein L ² is a halogenated halogenated divalent aliphatic hydrocarbon group having 1 to 3 carbon atoms, a sulfonyl group, an oxy group or a carbonyl group; R ⁵ , R ⁶ and R ⁷ each independently represent a hydrogen atom, a hydroxyl group, a methoxy group, or a methyl group optionally substituted with halogen.

式（７ａ）中、Ｌ^３はハロゲン置換されていてもよい炭素数１〜３の２価の脂肪族炭化水素基、スルホニル基、オキシ基、カルボニル基又は単結合を示す。

In formula (7a), L ³ represents a C 1-3 divalent aliphatic hydrocarbon group, sulfonyl group, oxy group, carbonyl group or single bond which may be halogen-substituted.

  Examples of the diamine compound having a saturated alicyclic hydrocarbon group include 2,2-bis [4- (4-aminocyclohexyloxy) cyclohexyl] propane, bis [4- (3-aminocyclohexyloxy) cyclohexyl] sulfone, and bis [ 4- (4-aminocyclohexyloxy) cyclohexyl] sulfone, 2,2-bis [4- (4-aminocyclohexyloxy) cyclohexyl] hexafluoropropane, bis [4- (4-aminocyclohexyloxy) cyclohexyl] methane, 4 , 4′-bis (4-aminocyclohexyloxy) dicyclohexyl, bis [4- (4-aminocyclohexyloxy) cyclohexyl] ether, bis [4- (4-aminocyclohexyloxy) cyclohexyl] ketone, 1,3-bis ( 4-aminocyclohe Siloxy) benzene, 1,4-bis (4-aminocyclohexyloxy) benzene, 2,2′-dimethylbicyclohexyl-4,4′-diamine, 2,2′-bis (trifluoromethyl) dicyclohexyl-4,4 '-Diamine, 2,6,2', 6'-tetramethyl-4,4'-diamine, 5,5'-dimethyl-2,2'-sulfonyldicyclohexyl-4,4'-diamine, 3,3 ' -Dihydroxydicyclohexyl-4,4'-diamine, (4,4'-diamino) dicyclohexyl ether, (4,4'-diamino) dicyclohexylsulfone, (4,4'-diaminocyclohexyl) ketone, (3,3'- Diamino) benzophenone, (4,4′-diamino) dicyclohexylmethane, (4,4′-diamino) dicyclohexyl Examples include ether, (3,3′-diamino) dicyclohexyl ether, (4,4′-diamino) dicyclohexyl methane, (3,3′-diamino) dicyclohexyl ether, 2,2-bis (4-aminocyclohexyl) propane and the like. it can. These diamine compounds may be used individually by 1 type, or may be used in combination of 2 or more type. Further, other diamine compounds, that is, diamine compounds having no saturated hydrocarbon group can be used in combination.

  A diamine compound having a saturated alicyclic hydrocarbon group can be easily obtained, for example, by hydrogen reduction of an aromatic diamine compound. Examples of such aromatic diamine compounds include 2,2-bis [4- (4-aminophenoxy) phenyl] propane (hereinafter referred to as “BAPP”), bis [4- (3-aminophenoxy). ) Phenyl] sulfone, bis [4- (4-aminophenoxy) phenyl] sulfone, 2,2-bis [4- (4-aminophenoxy) phenyl] hexafluoropropane, bis [4- (4-aminophenoxy) phenyl ] Methane, 4,4′-bis (4-aminophenoxy) biphenyl, bis [4- (4-aminophenoxy) phenyl] ether, bis [4- (4-aminophenoxy) phenyl] ketone, 1,3-bis (4-aminophenoxy) benzene, 1,4-bis (4-aminophenoxy) benzene, 2,2′-dimethylbiphenyl-4,4 ′ Diamine, 2,2′-bis (trifluoromethyl) biphenyl-4,4′-diamine, 2,6,2 ′, 6′-tetramethyl-4,4′-diamine, 5,5′-dimethyl-2 , 2′-sulfonylbiphenyl-4,4′-diamine, 3,3′-dihydroxybiphenyl-4,4′-diamine, (4,4′-diamino) diphenyl ether, (4,4′-diamino) diphenylsulfone, (4,4′-diamino) benzophenone, (3,3′-diamino) benzophenone, (4,4′-diamino) diphenylmethane, (4,4′-diamino) diphenyl ether, (3,3′-diamino) diphenyl ether, etc. Can be illustrated.

  Hydrogen reduction of an aromatic diamine compound can be performed by a general method for reducing an aromatic ring. Examples of such reduction methods include Raney nickel catalysts and platinum oxide catalysts (D. Varech et al., Tetrahedron Letter 26, 61 (1985), RH Baker et al., J. Am. Chem. Soc., 69, 1250. (1947)), rhodium-aluminum oxide catalyst (JC Sircar et al., J. Org. Chem., 30, 3206 (1965), AI Meyers et al., Organic Synthesis Volume VI, 371 (1988), A. W. Burgstahler, Organic Synthesis Collective Volume V, 591 (1973), AJ Briggs, Synthesis, 1988, 66), rhodium oxide. -Platinum oxide catalyst (S. Nishimura, Bull. Chem. Soc. Jpn., 34, 32 (1961), EJ Corey et al., J. Am. Chem. Soc. 101, 1608 (1979)), charcoal supported Rhodium catalyst (K. Chebaane et al., Bull. Soc. Chim. Fr., 1975, 244), sodium borohydride-rhodium chloride catalyst (PG Gasman et al., Organic Synthesis Volume VI, 581 (1988), P. G. Gassman et al., Organic Synthesis Collective Volume VI, 601 (1988)) and the like.

式（８）中、Ｌ^４はメチレン基、スルホニル基、オキソ基、カルボニル基又は単結合を示し、Ｒ^８及びＲ^９はそれぞれ独立に、水素原子、アルキル基又は置換していてもよいフェニル基を示し、ｋは１〜５０の整数を示す。 The polyamideimide suitably used in the present invention can be synthesized by using a diamine compound represented by the following general formula (8) in addition to the diamine compound described above as a diamine compound.

In the formula (8), L ⁴ represents a methylene group, a sulfonyl group, an oxo group, a carbonyl group or a single bond, and R ⁸ and R ⁹ each independently represent a hydrogen atom, an alkyl group or an optionally substituted phenyl group. K represents an integer of 1 to 50.

R ⁸ and R ⁹ are each independently preferably a hydrogen atom, an alkyl group having 1 to 3 carbon atoms, or an optionally substituted phenyl group. Examples of the substituent which may be bonded to the phenyl group include an alkyl group having 1 to 3 carbon atoms and a halogen atom. In the diamine compound represented by the general formula (8), L ⁴ is particularly preferably an oxy group from the viewpoint of achieving both a low elastic modulus and a high Tg. Examples of such a diamine compound include Jeffamine D-400, Jeffamine D-2000 (manufactured by Sun Techno Chemical Co., Ltd., trade name), and the like.

  The polyamideimide suitably used in the present invention is extremely superior in water absorption resistance or water repellency compared to conventional polyamideimides because it is obtained from a diamine compound having a specific saturated hydrocarbon group as described above. Get higher. In particular, this embodiment uses a polyamideimide having a structural unit made of an alicyclic saturated hydrocarbon, obtained from a diamine compound having an alicyclic saturated hydrocarbon group, as a constituent material of a thermosetting resin composition described later. When the metal foil with an adhesive layer is formed, the metal-clad laminate obtained from the metal foil with an adhesive layer is hygroscopic as compared with, for example, a resin composition containing a polyamideimide having an aromatic ring as a constituent material. The adhesiveness at the time becomes difficult to decrease.

More preferably, the polyamideimide according to the present invention can be synthesized by using an aromatic diamine compound in combination with a diamine compound having a saturated hydrocarbon group. Examples of such aromatic diamine compounds include those represented by the following general formulas (9a) and (9b).

式（１０ａ）中、Ｌ^７はハロゲン置換されていてもよい炭素数１〜３の２価の脂肪族炭化水素基、スルホニル基、オキシ基、カルボニル基又は単結合を示す。 In the formulas (9a) and (9b), L ⁵ is an optionally halogenated divalent aliphatic hydrocarbon group having 1 to 3 carbon atoms, a sulfonyl group, an oxy group, a carbonyl group, a single bond, or the following formula ( 10a) or a divalent group represented by (10b), wherein L ⁶ is a halogenated halogenated divalent aliphatic hydrocarbon group having 1 to 3 carbon atoms, a sulfonyl group, an oxy group or a carbonyl group R ¹⁰ , R ¹¹ and R ¹² each independently represent a hydrogen atom, a hydroxyl group, a methoxy group or a halogen-substituted methyl group.

In formula (10a), L ⁷ represents an optionally substituted divalent aliphatic hydrocarbon group having 1 to 3 carbon atoms, a sulfonyl group, an oxy group, a carbonyl group or a single bond.

  More specifically, the compound is not particularly limited as long as it is a compound in which two amino groups are directly bonded to an aromatic ring, and a diamine in which two or more aromatic rings are bonded directly or via one group. For example, 2,2-bis [4- (4-aminophenoxy) phenyl] propane (BAPP), bis [4- (3-aminophenoxy) phenyl] sulfone, bis [4- (4-aminophenoxy) phenyl] Sulfone, 2,2-bis [4- (4-aminophenoxy) phenyl] hexafluoropropane, bis [4- (4-aminophenoxy) phenyl] methane, 4,4′-bis (4-aminophenoxy) biphenyl, Bis [4- (4-aminophenoxy) phenyl] ether, bis [4- (4-aminophenoxy) phenyl] ketone, 1,3-bis (4-aminophenoxy) , 1,4-bis (4-aminophenoxy) benzene, 2,2′-dimethylbiphenyl-4,4′-diamine, 2,2′-bis (trifluoromethyl) biphenyl-4,4′-diamine, 2,6,2 ′, 6′-tetramethyl-4,4′-diamine, 5,5′-dimethyl-2,2′-sulfonylbiphenyl-4,4′-diamine, 3,3′-dihydroxybiphenyl- 4,4′-diamine, (4,4′-diamino) diphenyl ether, (4,4′-diamino) diphenylsulfone, (4,4′-diamino) benzophenone, (3,3′-diamino) benzophenone, (4 , 4′-diamino) diphenylmethane, (4,4′-diamino) diphenyl ether, (3,3′-diamino) diphenyl ether, and the like. These aromatic diamine compounds may be used individually by 1 type, and may be used in combination of 2 or more type. The thermosetting resin composition of the adhesive layer obtained by using these aromatic diamine compounds in combination with the above-described diamine compound can further improve Tg and improve heat resistance.

式（１１）中、Ｒ^１３、Ｒ^１４、Ｒ^１５、Ｒ^１６、Ｒ^１７及びＲ^１８（以下、「Ｒ^１３〜Ｒ^１８」のように表記する。）は、それぞれ独立に、炭素数１〜３のアルキル基又は置換していてもよいフェニル基であると好ましい。フェニル基に結合していてもよい置換基としては、炭素数１〜３のアルキル基又はハロゲン原子が好ましい。Ｒ^１９及びＲ^２０は、それぞれ独立に、炭素数１〜６のアルキレン基又は置換していてもよいアリーレン基が好ましく、該アリーレン基としては置換していてもよいフェニレン基又は置換していてもよいナフタレン基が好ましい。アリーレン基に結合していてもよい置換基としては、炭素数１〜３のアルキル基又はハロゲン原子が好ましい。また、ａ及びｂはそれぞれ１〜１５の整数を示す。 Furthermore, you may use together the siloxane diamine represented by following General formula (11) as a diamine compound.

In formula (11), R ¹³ , R ¹⁴ , R ¹⁵ , R ¹⁶ , R ¹⁷ and R ¹⁸ (hereinafter referred to as “R ^{13 to} R ¹⁸ ”) are each independently represented by 1 to 1 carbon atoms. 3 alkyl groups or optionally substituted phenyl groups are preferred. The substituent that may be bonded to the phenyl group is preferably an alkyl group having 1 to 3 carbon atoms or a halogen atom. R ¹⁹ and R ²⁰ are each independently preferably an alkylene group having 1 to 6 carbon atoms or an optionally substituted arylene group, and the arylene group may be an optionally substituted phenylene group or an optionally substituted phenylene group. Good naphthalene groups are preferred. The substituent which may be bonded to the arylene group is preferably an alkyl group having 1 to 3 carbon atoms or a halogen atom. A and b each represent an integer of 1 to 15.

  As such a siloxane diamine, it is particularly preferable to use one having amine groups bonded to both ends of dimethylsiloxane. These siloxane diamines may be used alone or in combination of two or more. Siloxane diamines represented by general formula (11) are silicone oil X-22-161AS (amine equivalent 450), X-22-161A (amine equivalent 840), X-22-161B (amine equivalent 1500), X- 22-9409 (amine equivalent 700), X-22-1660B-3 (amine equivalent 2200) (above, manufactured by Shin-Etsu Chemical Co., Ltd., trade name), BY16-853 (amine equivalent 650), BY16-853B (amine equivalent 2200) ), (Above, manufactured by Toray Dow Corning Silicone Co., Ltd., trade name) and the like.

  The polyamideimide obtained by using the above-mentioned siloxane diamine as a raw material has a siloxane structure in the main chain, so that the flexibility is improved and the occurrence of swelling and the like under high temperature conditions is greatly reduced. be able to.

  In order to obtain the polyamideimide according to the present embodiment, for example, first, the amino group of the diamine compound is reacted with the carboxyl group or the anhydrous carboxyl group of trimellitic anhydride. At this time, it is preferable that the amino group reacts with an anhydrous carboxyl group. Such a reaction can be carried out at 70 to 100 ° C. by dissolving or dispersing both compounds in an aprotic polar solvent. Examples of the aprotic polar solvent include N-methyl-2-pyrrolidone (NMP), γ-butyrolactone, N, N-dimethylformamide, N, N-dimethylacetamide, dimethyl sulfoxide, sulfolane, and cyclohexanone. Of these, NMP is particularly preferable. These aprotic polar solvents may be used alone or in combination of two or more.

  The above-mentioned aprotic polar solvent is preferably an amount such that the solid content is 10 to 70% by mass with respect to the total weight of the solution containing the aprotic polar solvent, the diamine compound and tritometic anhydride. The amount is more preferably 60% by mass. When the solid content in the solution is less than 10% by mass, the amount of the solvent used tends to be industrially disadvantageous, and when it exceeds 70% by mass, the solubility of trimellitic anhydride decreases, It tends to be difficult to perform a sufficient reaction.

  Subsequently, an imide group-containing dicarboxylic acid can be obtained by adding an aromatic hydrocarbon azeotropic with water to the solution after the above reaction and further reacting at 150 to 200 ° C. to cause a dehydration ring-closing reaction. it can. Examples of aromatic hydrocarbons that can be azeotroped with water include toluene, benzene, xylene, and ethylbenzene, and it is preferable to use toluene. The aromatic hydrocarbon is preferably added in an amount corresponding to 10 to 50 parts by mass with respect to 100 parts by mass of the aprotic polar solvent. When the addition amount of the aromatic hydrocarbon is less than 10 parts by mass with respect to 100 parts by mass of the aprotic polar solvent, the water removal effect tends to be insufficient, and the amount of imide group-containing dicarboxylic acid produced is small. There is a tendency to decrease. Moreover, when it exceeds 50 mass parts, reaction temperature will fall and it exists in the tendency for the production amount of imide group containing dicarboxylic acid to reduce.

  Further, during the dehydration and ring closure reaction, the aromatic hydrocarbon in the solution is distilled off simultaneously with water, so that the amount of the aromatic hydrocarbon may be less than the above preferred range. It is preferable to keep the amount of aromatic hydrocarbons at a constant ratio, for example, by separating the aromatic hydrocarbons distilled in the moisture determination receiver into water and then returning them to the reaction solution. In addition, after completion | finish of a spin-drying | dehydration ring-closing reaction, it is preferable to remove the aromatic hydrocarbon which can be azeotroped with water, keeping the temperature of a solution at about 150-200 degreeC.

式中、Ｌ^８は上記一般式（６ａ）、（６ｂ）、（８）、（９ａ）、（９ｂ）又は（１１）で表されるジアミン化合物のアミノ基を除いた残基を示す。ここで、Ｒ^５〜Ｒ^２０及びｋ、ａ、ｂは上記と同義である。 As the imide group-containing dicarboxylic acid obtained as described above, for example, a compound represented by the following general formula (12) is suitable.

Wherein, ^{L 8} is the general formula (6a), a residue formed by removing (6b), (8), (9a), amino groups of the diamine compound represented by (9b) or (11). Here, R ^{5 to} R ²⁰ and k, a, and b are as defined above.

  The polyamideimide suitably used in the present embodiment can be produced by inducing an imide group-containing dicarboxylic acid as described above into an acid halide and copolymerizing it with the diamine compound. The imide group-containing dicarboxylic acid is easily derived into an acid halide by reaction with thionyl chloride, phosphorus trichloride, phosphorus pentachloride, or dichloromethyl methyl ether, and the resulting imide group-containing dicarboxylic acid halide is at room temperature or under heating conditions. It can be easily copolymerized with the diamine compound below.

  Moreover, the polyamideimide suitably used in this embodiment can be produced by copolymerizing the imide group-containing dicarboxylic acid as described above with the diamine compound in the presence of a condensing agent. In such a reaction, a general condensing agent that forms an amide bond can be used as the condensing agent, and in particular, dicyclohexylcarbodiimide, diisopropylcarbodiimide, or N-ethyl-N′-3-dimethylaminopropylcarbodiimide alone. Or it is preferable to use together with N-hydroxysuccinimide or 1-hydroxybenzotriazole.

  Furthermore, as described above, the polyamideimide of this embodiment can be obtained by reacting diisocyanate after derivatizing the imide group-containing dicarboxylic acid into an acid halide. When going through such a reaction, (diamine compound: trimellitic anhydride: diisocyanate) is in the range of 1.0: (2.0-2.2) :( 1.0-1.5) in molar ratio. It is preferable that the ratio is in the range of 1.0: (2.0 to 2.2) :( 1.0 to 1.3). In the reaction, by setting the molar ratio of these compounds within the above range, it is possible to obtain a polyamideimide having a higher molecular weight and advantageous for film formation.

As a diisocyanate used in the synthesis | combination of a polyamideimide, the compound represented by following General formula (13) can be illustrated.

In the formula (13), L ⁹ is a divalent organic group having one or more aromatic rings or a divalent aliphatic hydrocarbon group, a group represented by the following formula (14a), It is preferably a group selected from the group consisting of a group represented by 14b), a tolylene group, a naphthylene group, a hexamethylene group and a 2,2,4-trimethylhexamethylene group.

  As the diisocyanate represented by the general formula (13), aliphatic diisocyanate or aromatic diisocyanate can be used, but it is preferable to use aromatic diisocyanate, and it is particularly preferable to use both in combination. Aromatic diisocyanates include 4,4′-diphenylmethane diisocyanate (MDI), 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate, naphthalene-1,5-diisocyanate, 2,4-tolylene dimer, and the like. As an example, it is particularly preferable to use MDI. By using MDI as the aromatic diisocyanate, the flexibility of the polyamideimide obtained can be improved and the crystallinity can be reduced, so that the film-formability of the polyamideimide can be improved. Examples of the aliphatic diisocyanate include hexamethylene diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate, and isophorone diisocyanate.

  When aromatic diisocyanate and aliphatic diisocyanate are used in combination, it is preferable to add aliphatic diisocyanate in an amount of about 5 to 10 parts by mole with respect to 100 parts by mole of aromatic diisocyanate, thereby further improving the heat resistance of the resulting polyamideimide. Can be improved.

  The reaction between the imide group-containing dicarboxylic acid and the diisocyanate can be performed at a reaction temperature of 130 to 200 ° C. by adding the diisocyanate to a solution containing the imide group-containing dicarboxylic acid. When a basic catalyst is used, this reaction is preferably performed at 70 to 180 ° C, more preferably 120 to 150 ° C. When such a reaction is performed in the presence of a basic catalyst, the reaction can proceed at a lower temperature than when the reaction is performed in the absence of a basic catalyst. The progress of side reactions such as reaction between each other can be suppressed, and a high molecular weight polyamideimide compound can be obtained.

  Examples of such basic catalysts include trialkylamines such as trimethylamine, triethylamine, tripropylamine, tri (2-ethylhexyl) amine, and trioctylamine. Among these, triethylamine is particularly preferable because it is a suitable basic catalyst capable of promoting the above-described reaction and can be easily removed from the system after the reaction.

The polyamideimide obtained by the above reaction has a structural unit represented by the following general formula (15). In the formula, L ⁸ and L ⁹ have the same meanings as L ⁸ and L ⁹ described above.

  The weight average molecular weight (Mw) of the polyamideimide obtained as described above is preferably 20000 to 300000, more preferably 30000 to 200000, and particularly preferably 40000 to 150,000. In addition, Mw here is measured by gel permeation chromatography and converted by a calibration curve created using standard polystyrene.

  In the metal foil with an adhesive layer of the present embodiment, the thermosetting resin composition that is a constituent material of the adhesive layer includes (A) an oxirane ring or oxetane ring as a component, and (B) a triazine ring-containing novolac type phenol resin. It is preferable to further contain a curing accelerator having a catalytic function that promotes the curing reaction with the component (C). Specific examples of the curing accelerator include those exemplified and listed in the first embodiment, and these may be used alone or in combination of two or more.

  Further, the thermosetting resin composition that is a constituent material of the adhesive layer according to the present embodiment further contains a radical polymerization initiator in order to promote the crosslinking reaction of the unsaturated bond group of the component (A). And preferred. Specific examples of the radical polymerization initiator include those listed and exemplified in the first embodiment, and these may be used alone or in combination of two or more.

  In addition, the thermosetting resin composition, which is a constituent component of the adhesive layer according to the present embodiment, has heat resistance and adhesiveness when various additives such as flame retardants and fillers are used as printed wiring boards as necessary. Further, it may be further blended in a blending amount within a range that does not deteriorate the properties such as moisture absorption resistance. Specific examples, shapes, and particle sizes of these additives are the same as those described in the first embodiment. Further, the preferable blending ratio is blended with respect to the total amount of the (A) component and the (B) component described in the first embodiment with respect to the total amount of the (A) component, the (B) component, and the (C) component. The numerical range is similar to the ratio.

  A thermosetting resin composition that is a constituent material of an adhesive layer according to a preferred embodiment of the present invention includes (A) component, (B) component, (C) component, a curing accelerator, a radical polymerization initiator, and Accordingly, other additives can be produced by blending and mixing by a known method.

  In the metal foil with an adhesive layer according to a preferred embodiment of the present invention, the thickness (thickness) of the adhesive layer is preferably 0.1 to 10.0 μm, and more preferably 0.5 to 5.0 μm. . If the film thickness is less than 0.1 μm, it tends to be difficult to improve the peeling strength of the metal foil in the metal-clad laminate provided with the adhesive layer. If it exceeds 10.0 μm, the insulation of the metal-clad laminate is particularly difficult. When a resin as will be described later is used for the resin layer, the high-frequency transmission characteristics tend to deteriorate.

  Although the metal foil which concerns on suitable embodiment of this invention is not specifically limited, Copper foil, nickel foil, and aluminum foil are mentioned, Usually, it is preferable when electric field copper foil or rolled copper foil is used. In addition, this metal foil improves the barrier layer formation treatment with nickel, tin, zinc, chromium, molybdenum, cobalt, etc., and adhesion with the insulating layer from the viewpoint of improving its rust resistance, chemical resistance and heat resistance. Therefore, it is preferable that a normal surface treatment such as a surface roughening treatment or a treatment with a silane coupling agent is performed.

  Among these surface treatments, regarding the surface roughening treatment, if the roughening treatment is performed so that the surface roughness (Rz) on the M-plane is preferably 4 μm or less, more preferably 2 μm or less, high-frequency transmission characteristics are obtained. This can be further improved. Examples of the silane coupling agent used for the silane coupling agent treatment include epoxy silane, amino silane, cationic silane, vinyl silane, acryloxy silane, methacryloxy silane, ureido silane, mercapto silane, sulfide silane, and isocyanate silane. However, it is not particularly limited.

  The metal foil may be a single layer made of one kind of metal material, may be a single layer made of a plurality of metal materials, or may be formed by laminating a plurality of metal layers of different materials, The thickness is not particularly limited. Among these metal foils, as copper foil, F2-WS (Furukawa Circuit Foil, Rz = 3.0), F0-WS (Furukawa Circuit Foil, trade name, Rz = 1.2 μm), 3EC- VLP (manufactured by Mitsui Kinzoku Co., Ltd., trade name, Rz = 3.0) is commercially available.

  The metal foil with an adhesive layer according to a preferred embodiment of the present invention can be produced by a known method. That is, after applying the above-described thermosetting resin composition according to a preferred embodiment of the present invention, or a varnish in which this resin composition is dissolved or dispersed in a solvent, on one side (M surface side) of the metal foil, It is dried and semi-cured (B stage) to form an adhesive layer on the metal foil. Thereby, the metal foil with an adhesive layer of this embodiment can be obtained. Application | coating can be implemented by a well-known method, for example, can be performed using a kiss coater, a roll coater, a comma coater, etc. The drying may be performed in a heat drying oven or the like, usually at a temperature of 70 to 250 ° C., preferably 100 to 200 ° C., for 1 to 30 minutes, preferably 3 to 15 minutes. The drying temperature at this time is preferably equal to or higher than the temperature at which the solvent can be volatilized when a solvent is used to dissolve the thermosetting resin composition.

  The solvent used when varnishing the thermosetting resin composition described above is not particularly limited, but specific examples include alcohols such as methanol, ethanol, butanol, ethyl cellosolve, butyl cellosolve, ethylene glycol monomethyl ether. , Ethers such as carbitol and butyl carbitol, ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone and cyclohexanone, aromatic hydrocarbons such as toluene, xylene and mesitylene, methoxyethyl acetate, ethoxyethyl acetate, butoxyethyl acetate And solvents such as esters such as ethyl acetate, nitrogen-containing compounds such as N, N-dimethylformamide, N, N-dimethylacetamide, and N-methyl-2-pyrrolidone. These may be used individually by 1 type and may be used in combination of 2 or more type.

  The metal foil with an adhesive layer according to a preferred embodiment of the present invention thus obtained has a structure in which the adhesive layer 20 is laminated on the M surface 12 of the metal foil 10 as shown in the partial perspective view of FIG. It has become.

  Among these solvents, the blending ratio in the case of using aromatic hydrocarbons and ketones is preferably 30 to 300 parts by mass of ketones with respect to 100 parts by mass of aromatic hydrocarbons, and 30 to 250 parts by mass. Parts, more preferably 30 to 220 parts by mass. In addition, when the varnish is formed, it is preferable to adjust the amount of the solvent so that the solid content (nonvolatile content) concentration in the varnish is usually 5 to 80% by mass, but the adhesion according to a preferred embodiment of the present invention. When producing a metal foil with a layer, the solid content concentration and the varnish viscosity can be adjusted by adjusting the amount of solvent so that the adhesive layer has a desired film thickness, particularly the above-described preferable film thickness.

  When the metal foil with an adhesive layer according to a preferred embodiment of the present invention described above is used, a metal-clad laminate obtained from the above is obtained by using polybutadiene, triallyl cyanurate, triallyl isocyanurate, functional group as a constituent material of the insulating resin layer. When using a low dielectric constant resin such as polyphenylene ether, it can not only exhibit high conductor foil peeling strength, but also can maintain a high adhesive force even during moisture absorption. As a result, the metal-clad laminate has sufficiently high heat resistance and moisture heat resistance.

  Furthermore, these excellent characteristics are sufficiently expressed even when a metal foil having a relatively small surface roughness of the adhesive surface is provided, so that excellent high frequency characteristics and high adhesiveness and heat resistance. Coexistence is possible. For these reasons, the metal foil with an adhesive layer of the present invention is effective as a member / part application such as a metal-clad laminate constituting a printed wiring board provided in various electric / electronic devices that handle high-frequency signals.

  Next, a metal-clad laminate according to a preferred embodiment of the present invention will be described. The metal-clad laminate is only required to be formed using the metal foil with an adhesive layer of the present invention, and the formation method, shape, laminated state, and the like are not particularly limited. Therefore, the metal-clad laminate is laminated, for example, such that the above-mentioned metal foil with an adhesive layer is in contact with at least one surface of an insulating resin film containing an insulating resin so that the adhesive layer of the metal foil with an adhesive layer is in contact with it. Thus, a laminate is obtained, and the laminate is obtained by heating and pressing. More specifically, first, a prepreg is prepared as an insulating resin film for forming a substrate for a printed wiring board. As the prepreg, those prepared by a known method by impregnating a reinforcing fiber such as glass fiber or organic fiber with a resin such as polybutadiene, triallyl cyanurate, triallyl isocyanurate, or functionalized polyphenylene ether can be used. .

  Next, a plurality of prepared prepregs are preferably stacked, and the metal foil with the adhesive layer according to the present invention described above is adhered to the prepreg so that the adhesive layer is in contact therewith. A metal-clad laminate is formed by heating and / or pressurizing. The heating in this case can be carried out preferably at a temperature of 150 to 250 ° C., and the pressurization can be carried out preferably at a pressure of 0.5 to 10.0 MPa. Heating and pressing are preferably performed simultaneously using a vacuum press or the like. In this case, the adhesive layer (cured layer) and the insulating resin layer are sufficiently cured by performing these treatments for 30 minutes to 10 hours, A metal-clad laminate having excellent adhesion between the conductive layer and the insulating layer and excellent in chemical resistance, heat resistance and moisture heat resistance can be produced. The metal foil with an adhesive layer may be applied to only one side of the prepreg, or may be applied to both sides to produce a double-sided metal-clad laminate.

  For example, as shown in the partial cross-sectional view of FIG. 2, the metal-clad laminate manufactured in this way includes a plurality of insulating resin layers 40 that are cured products (base materials) of prepregs, which are cured products of adhesive layers. A certain hardened layer 30 is sandwiched, and a metal foil 10 as a conductive layer is further sandwiched therebetween. In addition, the insulating resin layer 40 and the cured layer 30 are substantially integrated by curing, in other words, the conductive layer 10 sandwiches the insulating layer 50 composed of the insulating resin layer 40 and the cured layer 30. It consists of Since such a metal-clad laminate is produced using the metal foil with an adhesive layer of the present invention, it is possible to form a printed wiring board that can sufficiently reduce transmission loss particularly in a high-frequency band, and further, the insulating layer 50. And the adhesive force between the conductive layers 10 is sufficiently strong.

  Next, a printed wiring board according to a preferred embodiment of the present invention will be described. This printed wiring board should just be formed using the metal foil with an adhesive layer of this invention, and the formation method, shape, lamination | stacking state, etc. are not specifically limited. Therefore, the printed wiring board according to the present embodiment is formed into a circuit shape by etching the metal foil after, for example, subjecting the metal-clad laminate according to the present invention to drilling or metal plating by a known method. It is obtained by processing.

  In the printed wiring board obtained in this way, for example, as shown in the partial cross-sectional view of FIG. 3, a plating film 60 is formed on the wall surface of the through hole 70 and the conductive layer 10. Forming part.

  Moreover, a multilayer printed wiring board can be formed using this printed wiring board as an inner layer core substrate. First, one layer or a plurality of layers of the above-described prepreg are laminated on one or both sides of an inner layer core substrate that is the printed wiring board, and a metal foil is disposed on the prepreg layer. Or you may arrange | position the metal foil with an adhesive layer which concerns on this invention on the layer of a prepreg so that an adhesive layer may contact | connect a prepreg. Then, the obtained laminate can be heat-pressed and subjected to drilling or metal plating, and then the outermost metal foil can be processed into a circuit shape to obtain a multilayer printed wiring board.

  Furthermore, by using a plurality of inner-layer core substrates and a plurality of the above-mentioned prepregs, these are alternately laminated, heated and pressed, and subjected to the same process as described above to obtain a multilayer printed wiring board. Obtainable. As the outermost layer of the multilayer printed wiring board, a normal metal foil or a metal foil with an adhesive of the present invention may be used on the prepreg layer, or a core substrate may be used.

  The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited to these Examples.

[Synthesis of Polyamideimide]
(Synthesis Example 1)
First, in a 1 L separable flask equipped with a Dean-Stark reflux condenser, a thermometer, and a stirrer, (4,4′-diamino) dicyclohexylmethane (Wandamine HM (as diamine compound A having a saturated alicyclic hydrocarbon group) was added. WHM), manufactured by Shin Nippon Chemical Co., Ltd., trade name) 45 mmol, reactive silicone oil as siloxane diamine compound B (X-22-161-B, manufactured by Shin-Etsu Chemical Co., Ltd., amine equivalent: 1500, trade name) 5 mmol, anhydrous tri 105 mmol of merit acid (TMA) and 145 g of N-methyl-2-pyrrolidone (NMP) as an aprotic polar solvent were added, and the temperature in the flask was set at 80 ° C. and stirred for 30 minutes.

  After completion of the stirring, 100 mL of toluene was further added as an aromatic hydrocarbon azeotropic with water, and the temperature in the flask was raised to 160 ° C. and refluxed for about 2 hours. After confirming that the theoretical amount of water was stored in the moisture meter and no water distilling was observed, the temperature in the flask was increased to 190 ° C while removing the water in the meter. The toluene in the reaction solution was removed.

  After returning the solution in the flask to room temperature, 60 mmol of 4,4′-diphenylmethane diisocyanate (MDI) was added as a diisocyanate, the temperature in the flask was raised to 190 ° C. and reacted for 2 hours, and then diluted with NMP. Thus, an NMP solution of polyamideimide of Synthesis Example 1 (solid content concentration of 30% by mass) was obtained. It was 50000 when the weight average molecular weight (Mw) of this NMP solution was measured by the gel permeation chromatography.

(Synthesis Example 2)
First, in a 1 L separable flask equipped with a Dean-Stark reflux condenser, a thermometer, and a stirrer, Jeffamine D-2000 (trade name, manufactured by Sun Techno Chemical Co., Ltd.) 30 mmol as a diamine compound C having a saturated aliphatic hydrocarbon group. , 120 mmol of (4,4′-diamino) diphenylmethane (DDM) as aromatic diamine compound D, 315 mmol of trimellitic anhydride (TMA), 442 g of N-methyl-2-pyrrolidone (NMP) as an aprotic polar solvent, The temperature in the flask was set to 80 ° C. and stirred for 30 minutes.

  After completion of the stirring, 100 mL of toluene was further added as an aromatic hydrocarbon azeotropic with water, and the temperature in the flask was raised to 160 ° C. and refluxed for about 2 hours. After confirming that the theoretical amount of water was stored in the moisture meter and no water distilling was observed, the temperature in the flask was increased to 190 ° C while removing the water in the meter. The toluene in the reaction solution was removed.

  After returning the solution in the flask to room temperature, 180 mmol of 4,4′-diphenylmethane diisocyanate (MDI) was added as a diisocyanate, the temperature in the flask was raised to 190 ° C. and reacted for 2 hours, and then diluted with NMP. Thus, an NMP solution of polyamideimide of Synthesis Example 4 (solid content concentration of 30% by mass) was obtained. It was 74000 when Mw of this NMP solution was measured by the gel permeation chromatography.

[Preparation of resin varnish for adhesive layer (curable resin composition)]
(Preparation Example 1)
(A) The first modified epoxy compound (PB3600, manufactured by Daicel Chemical Industries, Ltd., trade name), 10 g, is added to the triazine ring-containing cresol novolac type phenol resin (EXB-9829, Dainippon Ink Chemical Co., Ltd.), which is the component (B). 3.8 g manufactured by Kogyo Co., Ltd., trade name), 2-ethyl-4-methylimidazole (2E4MZ, manufactured by Shikoku Kasei Kogyo Co., Ltd., trade name) as a curing accelerator, and α, After adding 0.2 g of α′-bis (t-butylperoxy) diisopropylbenzene (Perbutyl P, trade name, manufactured by NOF Corporation), 56 g of methyl ethyl ketone was added, and the resin varnish for adhesive layer of Preparation Example 1 ( A solid concentration of about 20% by mass was prepared.

(Preparation Example 2)
(A) The first modified epoxy compound (A1020, manufactured by Daicel Chemical Industries, Ltd., trade name) 10 g is added to the triazine ring-containing cresol novolac type phenol resin (EXB-9829, Dainippon Ink Chemical Co., Ltd.) as the component (B). Kogyo Co., Ltd., trade name) 2.5 g, (C) component carboxylic acid-modified acrylonitrile butadiene rubber particles (XER-91SE-15, JSR Corporation, trade name, solid content concentration 15% by mass) 4.5 g Furthermore, 2-ethyl-4-methylimidazole (2E4MZ, manufactured by Shikoku Kasei Kogyo Co., Ltd., trade name) 0.10 g as a curing accelerator, α, α′-bis (t-butylperoxy) as a radical polymerization initiator After adding 0.2 g of diisopropylbenzene (Perbutyl P, manufactured by NOF Corporation, trade name), 50 g of methyl ethyl ketone was blended, Adhesive layer resin varnish Ghost 2 (solid content concentration of about 20 wt%) was prepared.

(Preparation Example 3)
(A) Component second modified epoxy compound (EPB-13, manufactured by Nippon Soda Co., Ltd., reaction product of carboxylic acid-terminated polybutadiene and bisphenol A type epoxy resin, product name) 12 g, (B) component triazine 1.5 g of ring-containing cresol novolac type phenol resin (EXB-9829, manufactured by Dainippon Ink and Chemicals, trade name), (C) component carboxylic acid-modified polyvinyl acetal resin (KS-23Z, manufactured by Sekisui Chemical Co., Ltd.) (Trade name) 3.4 g, 2-ethyl-4-methylimidazole (2E4MZ, manufactured by Shikoku Kasei Kogyo Co., Ltd., trade name) 0.12 g as a curing accelerator, and α, α′- as a radical polymerization initiator. After adding 0.24 g of bis (t-butylperoxy) diisopropylbenzene (Perbutyl P, manufactured by NOF Corporation, trade name), By blending ethyl ketone 68 g, adhesive layer resin varnish of Preparation Example 3 (solid content concentration of about 20 wt%) was prepared.

(Preparation Example 4)
(A) Component second modified epoxy compound (EPB-13, manufactured by Nippon Soda Co., Ltd., reaction product of carboxylic acid-terminated polybutadiene and bisphenol A type epoxy resin, product name) 12 g, (B) component triazine Ring-containing novolak phenol resin (LA-1356, manufactured by Dainippon Ink & Chemicals, Inc., trade name, solid content concentration 60% by mass) 2.4 g, (C) component polyvinyl acetal resin (KS-5Z, Sekisui Chemical Co., Ltd.) (Company name, product name) 3.4 g, 2-ethyl-4-methylimidazole (2E4MZ, manufactured by Shikoku Kasei Kogyo Co., Ltd., product name) 0.12 g as a curing accelerator, α, α as a radical polymerization initiator After adding 0.24 g of '-bis (t-butylperoxy) diisopropylbenzene (Perbutyl P, manufactured by NOF Corporation, trade name), methylethyl By blending tons 67 g, resin varnish for the adhesive layer of Preparation 4 (solid content concentration of about 20 wt%) was prepared.

(Preparation Example 5)
(A) Component 1A modified epoxy compound (A1020, manufactured by Daicel Chemical Industries, Ltd., trade name) 10 g, (B) component triazine ring-containing novolak phenol resin (LA-1356, Dainippon Ink & Chemicals, Inc.) (Product name, solid content concentration 60 mass%) 4 g, (C) component acrylonitrile butadiene rubber particles (XER-81SE-15, manufactured by JSR Corporation, product name, solid content concentration 15 mass%) 4.5 g Furthermore, 2-ethyl-4-methylimidazole (2E4MZ, manufactured by Shikoku Kasei Kogyo Co., Ltd., trade name) 0.10 g as a curing accelerator, α, α′-bis (t-butylperoxy) as a radical polymerization initiator After adding 0.2 g of diisopropylbenzene (Perbutyl P, manufactured by NOF Corporation, trade name), 48 g of methyl ethyl ketone was blended, and The wear layer resin varnish (solids concentration of about 20 wt%) was prepared.

(Preparation Example 6)
(A) The first modified epoxy compound (PB3600, manufactured by Daicel Chemical Industries, Ltd., trade name), 10 g, is added to the triazine ring-containing cresol novolac type phenol resin (EXB-9829, Dainippon Ink Chemical Co., Ltd.), which is the component (B). Made by Kogyo Co., Ltd., trade name) 4.7 g, 21 g of the polyamideimide NMP solution obtained in Synthesis Example 1 as component (C), and 2-ethyl-4-methylimidazole (2E4MZ, Shikoku) as a curing accelerator. 0.10 g of Kasei Kogyo Co., Ltd., trade name) and 0.12 g of α, α′-bis (t-butylperoxy) diisopropylbenzene (Perbutyl P, trade name of NOF Corporation, trade name) as a radical polymerization initiator were added. Thereafter, 70 g of N-methyl-2-pyrrolidone (NMP) was blended to prepare the resin varnish for the adhesive layer of Preparation Example 6 (solid content concentration of about 20% by mass). It was.

(Preparation Example 7)
(A) Component second modified epoxy compound (EPB-13, manufactured by Nippon Soda Co., Ltd., reaction product of carboxylic acid-terminated polybutadiene and bisphenol A type epoxy resin, product name) 12 g, (B) component triazine 1.3 g of ring-containing cresol novolac-type phenolic resin (EXB-9829, manufactured by Dainippon Ink and Chemicals, trade name), 30 g of the polyamideimide NMP solution obtained in Synthesis Example 2 as the component (C), and 0.12 g of 2-ethyl-4-methylimidazole (2E4MZ, manufactured by Shikoku Kasei Kogyo Co., Ltd., trade name) as a curing accelerator, and α, α′-bis (t-butylperoxy) diisopropylbenzene (perbutyl) as a radical polymerization initiator After adding 0.24 g of P, manufactured by Nippon Oil & Fats Co., Ltd., compounded with 68 g of N-methyl-2-pyrrolidone (NMP) Te adhesive layer resin varnish of Preparation Example 7 (solid content concentration of about 20 wt%) was prepared.

(Comparative Preparation Example 1)
11 g of bisphenol A type epoxy resin (DER-331L, manufactured by Dow Chemical Japan Co., Ltd., trade name) and triazine ring-containing cresol novolak type phenol resin (EXB-9829, manufactured by Dainippon Ink & Chemicals, Inc.) 6 as component (B) 6 Comparative Example 1 was prepared by adding 0.1 g of 2-ethyl-4-methylimidazole (2E4MZ, manufactured by Shikoku Kasei Kogyo Co., Ltd., trade name) as a curing accelerator and then adding 70 g of methyl ethyl ketone. An adhesive layer resin varnish (solid content concentration of about 20% by mass) was prepared.

(Comparative Preparation Example 2)
(A) Component 2nd modified epoxy compound (EPB-13, manufactured by Nippon Soda Co., Ltd., reaction product of carboxylic acid-terminated polybutadiene and bisphenol A type epoxy resin, trade name) 12 g, cresol novolac type phenol resin (KA) -1163, Dainippon Ink & Chemicals, Inc., trade name) 3.4g, and further, as a curing accelerator 2-ethyl-4-methylimidazole (2E4MZ, Shikoku Kasei Kogyo, trade name) 0.12g, After adding 0.24 g of α, α′-bis (t-butylperoxy) diisopropylbenzene (Perbutyl P, trade name, manufactured by NOF Corporation) as a radical polymerization initiator, 79 g of methyl ethyl ketone was added, and Comparative Preparation Example 2 resin varnish for adhesive layer (solid content concentration of about 20% by mass) was prepared.

[Production of metal foil with adhesive layer]
The resin varnish for the adhesive layer obtained in Preparation Examples 1 to 7 and Comparative Preparation Examples 1 and 2 is M of electrolytic copper foil (F0-WS-18, low profile copper foil, manufactured by Furukawa Electric Co., Ltd.) having a thickness of 12 μm. Each surface (surface roughness (Rz): 0.8 μm) was naturally cast and then dried at 150 ° C. for 5 minutes to produce metal foils with adhesive layers of Examples 1 to 7 and Comparative Examples 1 and 2. did. The thickness of the adhesive layer after drying was 2 μm. In addition, the case where the varnish of the preparation examples 1-7 is used corresponds to Examples 1-7, respectively, and the case where the varnish of the comparative adjustment examples 1-2 is used corresponds to Comparative Examples 1-2, respectively.

[Preparation of insulating resin layer prepreg]
(Production Example 1)
First, in a 2 L separable flask equipped with a condenser, a thermometer, and a stirrer, 400 g of toluene and 120 g of a polyphenylene ether resin (modified PPO-noryl PKN4752, manufactured by Nippon GE Plastics Co., Ltd., trade name) were placed. The solution was stirred and dissolved while heating to 90 ° C. Next, 80 g of triallyl isocyanurate (TAIC, Nippon Kasei Kogyo Co., Ltd., trade name) was added to the flask while stirring, and the mixture was cooled to room temperature after confirming that it was dissolved or uniformly dispersed. Next, after adding 2.0 g of α, α′-bis (t-butylperoxy) diisopropylbenzene (Perbutyl P, trade name, manufactured by NOF Corporation) as a radical polymerization initiator, 70 g of toluene was further blended. A varnish for an insulating resin layer having a solid content concentration of about 30% by mass was obtained.

  The obtained insulating resin layer varnish was impregnated into a 0.1 mm thick glass fiber (E glass, manufactured by Nitto Boseki Co., Ltd.) and then dried by heating at 120 ° C. for 5 minutes to produce a resin content of 50% by mass. The prepreg for insulating resin layers of Example 1 was obtained.

(Production Example 2)
First, in a 2 L separable flask equipped with a condenser, a thermometer, and a stirrer, 400 g of toluene and 120 g of a polyphenylene ether resin (modified PPO-noryl PKN4752, manufactured by Nippon GE Plastics Co., Ltd., trade name) were placed. The solution was stirred and dissolved while heating to 90 ° C. Next, while stirring, 80 g of 1,2-polybutadiene (B-1000, manufactured by Nippon Soda Co., Ltd., trade name) and 10 g of divinylbenzene (DVB) as a crosslinking aid were added and dissolved or uniformly dispersed. After confirmation, it was cooled to room temperature. Next, after adding 2.0 g of α, α′-bis (t-butylperoxy) diisopropylbenzene (Perbutyl P, trade name, manufactured by NOF Corporation) as a radical polymerization initiator, 70 g of toluene was further blended. A varnish for an insulating resin layer having a solid content concentration of about 30% by mass was obtained.

  The obtained insulating resin layer varnish was impregnated into a 0.1 mm thick glass fiber (E glass, manufactured by Nitto Boseki Co., Ltd.) and then dried by heating at 120 ° C. for 5 minutes to produce a resin content of 50% by mass. The prepreg for insulating resin layers of Example 2 was obtained.

(Production Example 3)
First, in a 10 L separable flask equipped with a condenser, a thermometer, and a stirrer, 5000 mL of tetrahydrofuran (THF) and 100 g of a polyphenylene ether resin (Noryl PPO646-111, manufactured by Nippon GE Plastics, Inc., trade name) The temperature in the flask was stirred and dissolved while heating to 60 ° C. After returning this to room temperature, 540 mL of n-butyllithium (1.55 mol / L, hexane solution) was added under a nitrogen stream and stirred for 1 hour. Furthermore, after adding 100 g of allyl bromide and stirring for 30 minutes, an appropriate amount of methanol was blended, and the precipitated polymer was isolated to obtain an allylated polyphenylene ether.

  Next, in a 2 L separable flask equipped with a cooling tube, a thermometer, and a stirrer, 400 g of toluene and 100 g of the allylated polyphenylene ether described above were placed and dissolved while stirring while heating the temperature in the flask to 90 ° C. . Next, 100 g of triallyl isocyanurate (TAIC, manufactured by Nippon Kasei Kogyo Co., Ltd., trade name) was added to the flask while stirring, and the mixture was cooled to room temperature after confirming that it was dissolved or uniformly dispersed. Then, after adding 2.5 g of α, α′-bis (t-butylperoxy) diisopropylbenzene (Perbutyl P, trade name, manufactured by NOF Corporation) as a radical polymerization initiator, 70 g of toluene was further blended. A varnish for an insulating resin layer having a solid content concentration of about 30% by mass was obtained.

  The obtained insulating resin layer varnish was impregnated into a 0.1 mm thick glass fiber (E glass, manufactured by Nitto Boseki Co., Ltd.) and then dried by heating at 120 ° C. for 5 minutes to produce a resin content of 50% by mass. The prepreg for insulating resin layers of Example 3 was obtained.

[Production of double-sided copper-clad laminate]
The metal foils with adhesive layers of Examples 1 to 7 and Comparative Examples 1 and 2 are bonded to both surfaces of the base material formed by stacking the four prepregs for insulating resin layer of any of Preparation Examples 1 to 3 described above. After making it adhere so that a layer may touch, it heat-press-molds on the press conditions of 200 ° C, 2.9 MPa, 70 minutes, and uses metal foil with an adhesion layer of Examples 1-7 and comparative examples 1-2. Double-sided copper-clad laminates (thickness: 0.55 mm) were prepared. In addition, it shows in Table 1 about the combination of the metal foil with an adhesive layer of Examples 1-7 and Comparative Examples 1-2, and the prepreg for insulation resin layers of Preparation Examples 1-3.

  For comparison, an electrolytic copper foil (F0-WS-18, Furukawa Electric Co., Ltd.) having a thickness of 18 μm without an adhesive layer on both surfaces of the base material formed by stacking the four prepregs for insulating resin layer of Production Example 1 Co., Ltd., trade name), or 18 μm thick electrolytic copper foil without adhesive layer (GTS-18, general copper foil, Furukawa Electric Co., Ltd., M-plane surface roughness (Rz): 8 μm, trade name) Was applied so that the M surface was in contact with each other, followed by heating and pressing under the press conditions of 200 ° C., 2.9 MPa, and 70 minutes to produce double-sided copper-clad laminates (thickness: 0.55 mm), respectively. did. Among these, the former double-sided copper clad laminate provided with the electrolytic copper foil is related to Comparative Example 3, and the double-sided copper clad laminate provided with the latter electrolytic copper foil is related to Comparative Example 4.

[Measurement of peel strength of copper foil in copper-clad laminate]
Unnecessary copper foil portions were removed by etching so that the copper foil of the obtained copper-clad laminate had a circuit shape with a line width of 5 mm, to produce a laminate sample having a planar shape of 2.5 cm × 10 cm. The sample thus prepared was held in an apparatus for normal and pressure cooker test (PCT) (conditions: 121 ° C., 2.2 atm, 100% RH) for 5 hours, and then peeled off with copper foil (unit: kN / m) was measured under the following conditions.
Test method: 90 ° C direction tensile test Tensile speed: 50 mm / min Measuring device: Autograph AG-100C manufactured by Shimadzu Corporation
The results are shown in Table 1. In addition, about this copper foil peeling strength, what was shown by "---" in a table | surface cannot measure the copper foil peeling strength since the copper foil had already peeled after hold | maintaining in PCT. Means that.

[Evaluation of solder heat resistance of copper-clad laminate]
The copper foil on one side of the above-mentioned copper-clad laminate cut to a 50 mm square is etched into a predetermined shape, and the normal time and pressure cooker test (PCT) apparatus (conditions: 121 ° C., 2.2 atm) for a predetermined time ( (1-5 hours) After being held, it was immersed in a molten solder at 260 ° C. for 20 seconds, and the appearance of the obtained copper-clad laminate (3 sheets) was examined visually. The results are shown in Table 1. In addition, the number in a table | surface means the number of sheets which did not swell and generation | occurrence | production of a mesling between an insulating layer and copper foil (electroconductive layer) among three copper clad laminated boards after a solder immersion.

[Evaluation of transmission loss of copper-clad laminate]
The transmission loss (unit: dB / m) of the copper-clad laminate was measured by a triplate line resonator method using a vector network analyzer. Measurement conditions were as follows: line width: 0.6 mm, insulating layer distance between upper and lower ground conductors: about 1.04 mm, line length: 200 mm, characteristic impedance: about 50Ω, frequency: 3 GHz, measurement temperature: 25 ° C. The results are shown in Table 1.

It is a fragmentary perspective view of the metal foil with an adhesive layer which concerns on suitable embodiment of this invention. 1 is a partial cross-sectional view of a metal-clad laminate according to a preferred embodiment of the present invention. It is a fragmentary sectional view of the printed wiring board concerning the suitable embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Metal foil (conductive layer), 20 ... Adhesive layer, 30 ... Hardened layer, 40 ... Insulating resin layer (insulating resin film), 50 ... Insulating layer, 60 ... Plating film, 70 ... Through-hole.

Claims (17)

A metal foil with an adhesive layer comprising a metal foil and an adhesive layer provided on the main surface of the metal foil,
The adhesive layer is
(A) component; a compound having an oxirane ring or an oxetane ring and having an ethylenically unsaturated bond;
(B) component; a novolac type phenol resin having a triazine ring;
Der made of a curable resin composition containing is,
The metal foil with an adhesive layer , wherein the ten-point average roughness (Rz) of the main surface of the metal foil is 4 μm or less .   The adhesive layer according to claim 1, wherein the functional group having the ethylenically unsaturated bond in the component (A) has one or more groups selected from the group consisting of a vinyl group, an allyl group, an acrylic group, and a methacryl group. With metal foil.   The metal foil with an adhesive layer according to claim 1, wherein the component (A) is an epoxy compound having a polybutadiene structure. A modified polybutadiene in which the epoxy compound has one or more groups selected from the group consisting of phenolic hydroxyl groups, alcoholic hydroxyl groups, carboxyl groups, amide groups, amino groups, imino groups, and groups represented by the following formula (III) The metal foil with an adhesive layer according to claim 3, which is a compound obtained by reacting a compound having two or more oxirane rings.

  The metal foil with an adhesive layer according to claim 3 or 4, wherein the epoxy compound has a vinyl group at a side chain or a terminal thereof. The adhesion according to claim 3, wherein the epoxy compound is represented by the following general formula (1), (2) or (3), or has a structural unit represented by the following general formula (5). Metal foil with layers.

(In formula, n shows the integer of 2-8, and the sum total of n and m shows the integer of 10-10000.)

(In the formula, R ¹ and R ² each independently represent a hydrogen atom or a hydroxyl group, and R ³ represents an acrylic group or an oxiranyl group.)

(Wherein, ^{R 4} represents a group represented by the following formula (4), i is an integer of 0 to 100, the sum of i and j is an integer of 10 to 10,000.)

(In the formula, p and u each independently represent an integer of 1 to 10,000, q represents an integer of 1 to 100, r and s each independently represents an integer of 0 to 100, and t represents 1 to 10,000. Represents an integer, where either r or s represents an integer of 1 or more.)   The metal foil with an adhesive layer according to any one of claims 1 to 6, wherein a blending ratio of the component (B) is 0.5 to 200 parts by mass with respect to 100 parts by mass of the component (A). A metal foil with an adhesive layer comprising a metal foil and an adhesive layer provided on the main surface of the metal foil,
The adhesive layer is
(A) component; a compound having an oxirane ring or an oxetane ring and having an ethylenically unsaturated bond;
(B) component; a novolac type phenol resin having a triazine ring;
(C) component; a polymer component;
Der made of a curable resin composition containing is,
The metal foil with an adhesive layer , wherein the ten-point average roughness (Rz) of the main surface of the metal foil is 4 μm or less .   The metal foil with an adhesive layer according to claim 8, wherein the component (C) is a crosslinked rubber particle.   The adhesive layer according to claim 8, wherein the component (C) comprises one or more particles selected from the group consisting of acrylonitrile butadiene rubber particles, carboxylic acid-modified acrylonitrile butadiene rubber particles, and butadiene rubber-acrylic resin core-shell particles. Metal foil.   The metal foil with an adhesive layer according to claim 8, wherein the component (C) comprises a polyvinyl acetal resin and / or a carboxylic acid-modified polyvinyl acetal resin.   The metal foil with an adhesive layer according to claim 8, wherein the component (C) is polyamideimide.   The metal foil with an adhesive layer according to claim 12, wherein the polyamideimide has a structural unit composed of a saturated hydrocarbon.   The blending ratio of the component (C) is 0.5 to 800 parts by mass with respect to a total of 100 parts by mass of the component (A) and the component (B). Metal foil with adhesive layer.   The said adhesive layer is obtained by volatilizing the said solvent after apply | coating the resin varnish containing the said curable resin composition and a solvent on the main surface of the said metal foil. The metal foil with an adhesive layer according to claim 1.   The metal foil with an adhesive layer according to claim 1, wherein the adhesive layer has a thickness of 0.1 to 5 μm. The metal foil with an adhesive layer according to any one of claims 1 to 16 is laminated on at least one surface of an insulating resin film containing a resin having an insulating property so that the adhesive layer of the metal foil with an adhesive layer is in contact with the metal foil. A metal-clad laminate obtained by heating and pressurizing the laminate.

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