Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J125/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Adhesives based on derivatives of such polymers
  • C09J125/02—Homopolymers or copolymers of hydrocarbons
  • C09J125/04—Homopolymers or copolymers of styrene
  • C09J125/08—Copolymers of styrene
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J7/00—Adhesives in the form of films or foils
  • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
  • H05K1/00—Printed circuits
  • H05K1/02—Details
  • H05K1/03—Use of materials for the substrate
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
  • H05K3/00—Apparatus or processes for manufacturing printed circuits
  • H05K3/22—Secondary treatment of printed circuits
  • H05K3/28—Applying non-metallic protective coatings
• • H—ELECTRICITY
  • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
  • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
  • H05K9/00—Screening of apparatus or components against electric or magnetic fields

Definitions

• the present invention relates to adhesive compositions. More particularly, it relates to an adhesive composition that can be used for bonding electronic parts and the like.
• FPCs flexible printed circuit boards
• the dielectric of the constituent elements and low dielectric base films and low dielectric adhesives are being developed.
• the present invention has good electrical properties (dielectric properties) that are compatible with 5G, exhibits good adhesion even to low-dielectric base films with poor adhesion, and has heat resistance and resin flow (resin flow). It is an adhesive composition for forming a low-dielectric adhesive layer that also suppresses the outflow property, and further forms an adhesive layer that exhibits excellent adhesion reliability even after 168 hours at 150 ° C.
• An object of the present invention is to provide an adhesive composition capable of
• the present inventors have made intensive studies to solve the above problems, and as a result, the adhesive composition can be made to The inventors have found that the above problems can be solved, and have completed the present invention.
• the present invention includes the following aspects.
• the adhesive composition according to [6], wherein the unmodified styrene elastomer having a styrene ratio of 33 or more has a weight average molecular weight of 50,000 or more.
• the adhesive composition according to [9], wherein the unmodified styrene elastomer having a styrene ratio of 33 or more is a block copolymer.
• the adhesive composition according to [10], wherein the unmodified styrene elastomer having a styrene ratio of 33 or more is a block copolymer containing a styrene-butadiene rubber (SBR) skeleton.
• SBR styrene-butadiene rubber
• the present invention while having good electrical properties (dielectric properties) compatible with 5G, it exhibits good adhesion even to low-dielectric base films with poor adhesion, heat resistance, resin flow (resin It is an adhesive composition for forming a low-dielectric adhesive layer that also suppresses the outflow property, and further forms an adhesive layer that exhibits excellent adhesion reliability even after 168 hours at 150 ° C. It is possible to provide an adhesive composition capable of
• the adhesive composition of the present invention a laminate containing an adhesive layer made of the adhesive composition, and an electronic component-related constituent member containing the laminate will be described in detail. is an example as one embodiment of the present invention, and is not limited to these contents.
• the adhesive composition of the present invention contains a resin composition containing a styrene elastomer.
• the adhesive composition of the present invention can contain a resin composition and a curing agent.
• the styrene-based elastomer contained in the resin composition includes a modified styrene-based elastomer and a styrene-based elastomer having a styrene ratio of 33 or more.
• the styrene-based elastomer may contain one or more modified styrene-based elastomers.
• the styrene-based elastomer may contain an unmodified styrene-based elastomer other than the modified styrene-based elastomer.
• One or two or more unmodified styrene elastomers may be contained.
• a styrene elastomer having a styrene ratio of 33 or more is contained, and the styrene elastomer having a styrene ratio of 33 or more may be a modified styrene elastomer or an unmodified styrene elastomer. good too.
• the modified styrene elastomer has a styrene ratio of 33 or more, that is, when it contains a modified styrene elastomer with a styrene ratio of 33 or more, at least one modified styrene elastomer must be contained.
• modified elastomers and other unmodified styrenic elastomers can also be contained.
• the styrene ratio of the modified styrene-based elastomer is less than 33
• an unmodified styrene-based elastomer having a styrene ratio of 33 or more is contained separately from the modified styrene-based elastomer.
• a preferred embodiment of the styrene-based elastomer of the present invention includes a styrene-based elastomer containing a modified styrene-based elastomer and an unmodified styrene-based elastomer having a styrene ratio of 33 or more.
• the resin composition used in the present invention may contain, in addition to the styrene elastomer, resin components other than the styrene elastomer and other components.
• the resin composition which is the main ingredient of the adhesive composition, contains a styrene-based elastomer.
• Styrenic elastomers are copolymers composed mainly of block and random structures of unsaturated hydrocarbons and aromatic vinyl compounds, and hydrogenated products thereof.
• aromatic vinyl compounds examples include styrene, t-butylstyrene, ⁇ -methylstyrene, divinylbenzene, 1,1-diphenylethylene, N,N-diethyl-p-aminoethylstyrene and vinyltoluene.
• unsaturated hydrocarbons include ethylene, propylene, butadiene, isoprene, isobutene, 1,3-pentadiene, 2,3-dimethyl-1,3-butadiene and the like.
• styrene-based elastomers include styrene, which can impart adhesiveness and electrical properties (dielectric properties) to the adhesive composition, has a relatively simple control of the molecular structure, and can easily adjust the properties of the adhesive composition.
• -butadiene copolymers styrene-ethylene propylene copolymers, styrene-isoprene copolymers, block copolymers thereof, and water additives thereof.
• a styrene-butadiene copolymer is preferable because it has the advantage that the molecular weight can be easily controlled and the properties of the adhesive composition can be stably produced.
• the styrene ratio which is the weight ratio of styrene monomer units, is preferably 20 or more, more preferably 30 or more. If the styrene ratio is 20 or more, the heat resistance of the adhesive composition can be expressed. If the styrene ratio is 30 or more, excellent adhesiveness can be exhibited. Also, it preferably contains a styrene elastomer with a styrene ratio of 33 or more, and more preferably contains a styrene elastomer with a styrene ratio of 40 or more.
• the styrene-based elastomer preferably has a styrene ratio of 80 or less, more preferably 60 or less.
• the styrene ratio is 80 or less, the fluidity at the time of heating can be enhanced, so that the surface of the substrate film can be sufficiently followed and excellent adhesive strength can be exhibited. If the styrene ratio is 60 or less, procurement of the styrene-based elastomer is easy.
• Styrene ratio can be measured using 1 H NMR. For example, using tetrachloromethane as a solvent, obtain the integrated value of the peak in the range of 6.5 ppm to 7.5 ppm corresponding to styrene and the integrated value of the peak in the other range, and calculate from the obtained values be able to. In the present application, the styrene ratio was calculated based on the styrene content (theoretical value) of the raw material.
• the styrene-based elastomer having a styrene ratio of 33 or higher is not particularly limited and can be selected depending on the purpose, whether it is a modified styrene-based elastomer or an unmodified styrene-based elastomer. A detailed description of the unmodified styrene elastomer will be given later.
• the weight average molecular weight (Mw) of the styrene elastomer is preferably 50,000 to 300,000, more preferably 100,000 to 300,000. If it is 100,000 to 200,000, it is possible to develop adhesion, and if it is 100,000 to 300,000, it is possible to achieve both adhesion and fluidity control.
• the weight average molecular weight is a value obtained by converting the molecular weight measured by gel permeation chromatography (hereinafter also referred to as "GPC") into polystyrene.
• a styrene-based elastomer having a styrene ratio of 33 or more is a styrene-based elastomer made of a styrene-butadiene block copolymer containing a styrene-butadiene rubber (SBR) skeleton from the viewpoint of increasing the styrene ratio and suppressing changes in storage elastic modulus. is more preferable.
• SBR styrene-based elastomer made of a styrene-butadiene block copolymer containing a styrene-butadiene rubber (SBR) skeleton from the viewpoint of increasing the styrene ratio and suppressing changes in storage elastic modulus. is more preferable.
• the content of the styrene-based elastomer having a styrene ratio of 33 or more contained in the resin composition used in the present invention is preferably 20 to 80 parts by mass, more preferably 30 to 70 parts by mass, based on 100 parts by mass of the resin composition. . If it is 20 to 80, the change in storage elastic modulus after 168 hours at 150° C. can be suppressed, and an adhesive composition having excellent adhesion can be obtained. If it is 30 to 70, resin flow can be suppressed in addition to the above.
• styrene-based elastomer Only one type of styrene-based elastomer may be used, or two or more types may be contained.
• a modified styrene elastomer is a styrene elastomer into which a substituent such as a carboxy group, an amino group, an epoxy group, an isocyanate group, an acryloyl group, a hydroxy group, a mercapto group, an imide group, or an alkoxysilyl group is introduced.
• a substituent such as a carboxy group, an amino group, an epoxy group, an isocyanate group, an acryloyl group, a hydroxy group, a mercapto group, an imide group, or an alkoxysilyl group.
• Examples thereof include styrene-based elastomers containing carboxy groups and styrene-based elastomers containing amino groups described below.
• Adhesion to metals and substrates is improved by containing a styrene-based elastomer containing a carboxy group or a styrene-based elastomer containing an amino group. Furthermore, since the carboxy group, amino group, etc. can react with the curing agent, it leads to improvement in heat resistance and chemical resistance, as well as further improvement in adhesion.
• a styrene-based elastomer containing a carboxyl group has high adhesion, can impart flexibility to a cured product, and is effective as a component that imparts good electrical properties.
• the adhesive composition is flexible even for adherends such as base films and metal foils with good electrical properties and low polarity. Since the substance can sufficiently follow the surface of the adherend, the highly polar carboxyl group can exhibit adhesion, thereby improving the adhesion of the adhesive layer.
• the styrene-based elastomer containing a carboxyl group is reactive, the heat resistance and chemical resistance of the adhesive layer are improved by reacting it with a curing agent.
• the dispersibility of the filler is improved by containing the carboxyl group.
• Styrenic elastomers containing carboxyl groups are copolymers mainly composed of block and random structures of unsaturated hydrocarbons and aromatic vinyl compounds, and hydrogenated products thereof modified with unsaturated carboxylic acids. be. Types of the aromatic vinyl compound and unsaturated hydrocarbon and specific examples of the styrene-based elastomer are as described in the section ⁇ Styrene-based elastomer>> above.
• Modification of a styrene-based elastomer containing a carboxy group can be carried out, for example, by copolymerizing an unsaturated carboxylic acid during polymerization of the styrene-based elastomer. It can also be carried out by heating and kneading a styrene-based elastomer and an unsaturated carboxylic acid in the presence of an organic peroxide.
• unsaturated carboxylic acids include acrylic acid, methacrylic acid, maleic acid, itaconic acid, fumaric acid, maleic anhydride, and itaconic anhydride.
• the amount of modification with unsaturated carboxylic acid is preferably 0.1 to 10% by mass.
• the acid value of the styrene-based elastomer containing carboxy groups is preferably 0.1 to 25 mgKOH/g, more preferably 0.5 to 23 mgKOH/g.
• the acid value is 0.1 mgKOH/g or more, the adhesive composition is sufficiently cured, and good adhesiveness and heat resistance can be obtained.
• the acid value is 30 mgKOH/g or less, the cohesive force of the adhesive composition is suppressed, resulting in excellent adhesiveness and excellent electrical properties.
• Styrenic elastomers containing amino groups are copolymers mainly composed of block and random structures of unsaturated hydrocarbons and aromatic vinyl compounds, and hydrogenated products thereof modified with amines.
• Types of the aromatic vinyl compound and unsaturated hydrocarbon and specific examples of the styrene-based elastomer are as described in the section ⁇ Styrene-based elastomer>> above.
• the method of amine-modifying the styrene elastomer is not particularly limited, and a known method can be used.
• a modification method a method of amine-modifying a (hydrogenated) copolymer by using an unsaturated monomer having an amino group as a raw material to be copolymerized, and a styrene-based elastomer containing a carboxy group with two amino groups.
• a method of modifying the amine by reacting the above amine modifier to form an amide structure or an imide structure, and the like.
• the total nitrogen content in the amino group-containing styrene elastomer is , preferably 50 to 5000 ppm, more preferably 200 to 3000 ppm. If the total nitrogen content is at least the above lower limit, excellent adhesion can be exhibited. If the total nitrogen content is equal to or less than the above upper limit, the electrical properties are excellent.
• the total nitrogen content in the styrene-based elastomer containing amino groups can be determined according to JIS-K2609 using a trace nitrogen analyzer ND-100 (manufactured by Mitsubishi Chemical Corporation).
• the content of the modified styrene-based elastomer contained in the resin composition used in the present invention is preferably 20 to 80 parts by mass, more preferably 30 to 70 parts by mass, based on 100 parts by mass of the resin composition.
• the adhesive composition can have excellent adhesiveness.
• the resin composition used in the present invention may contain an unmodified styrene elastomer in addition to the modified styrene elastomer.
• a styrene-based elastomer having a styrene ratio of 33 or more may be an unmodified styrene-based elastomer. Only one type of unmodified styrene elastomer may be used, or two or more types may be contained.
• a preferred embodiment of the resin composition used in the present invention is a resin composition containing a modified styrene elastomer and an unmodified styrene elastomer having a styrene ratio of 33 or more.
• a modified styrene-based elastomer having good surface adhesion to the adherend and an unmodified styrene-based elastomer capable of adjusting the storage elastic modulus for each temperature of the adhesive composition By using together, it is possible to control high adhesion and fluidity and suppress change in storage elastic modulus.
• a modified styrene-based elastomer and an unmodified styrene-based elastomer having similar molecular structures it is possible to obtain a resin composition having good compatibility and good adhesiveness.
• the resin composition used in the present invention may contain other resin components in addition to the styrene-based elastomer.
• the resin composition according to the present invention can contain, for example, thermoplastic resins other than the styrene-based elastomer to such an extent that the functions of the adhesive composition are not affected.
• thermoplastic resins include phenoxy resins, polyamide resins, polyester resins, polycarbonate resins, polyphenylene oxide resins, polyurethane resins, polyacetal resins, polyethylene resins, polypropylene resins, polybutadiene resins, and polyvinyl resins. is mentioned.
• These thermoplastic resins may be used alone or in combination of two or more.
• the numerical value of the resin flow may change depending on the compatibility of the styrene-based elastomer with the above-mentioned other thermoplastic resins, and it is also possible to adjust it by the blending method.
• the resin composition used in the present invention may contain other components in addition to the resin components such as the styrene-based elastomer and the other resin components described above.
• Other components include, for example, fillers, tackifiers, flame retardants, heat antioxidants, leveling agents, antifoaming agents, inorganic fillers and pigments, to the extent that they do not affect the functionality of the adhesive composition. can do.
• the numerical value of resin flow may change depending on the dispersibility of the styrene-based elastomer and other components, and it is also possible to adjust it by blending and dispersing method.
• the adhesive composition of the present invention preferably contains a filler.
• a filler for example, an inorganic filler is preferable from the viewpoint of heat resistance and mechanical property control of the adhesive composition, and as the inorganic filler, a silicon-based inorganic filler and boron nitride are preferable from the viewpoint of electrical properties. preferable.
• the silicon-based inorganic filler for example, mica and talc are preferable because they can control the mechanical properties of the adhesive composition even in a small amount and have excellent electrical properties.
• an organic filler is preferable from the viewpoint of dispersibility and brittleness
• a styrene-based spherical filler is preferable from the viewpoint of electrical properties
• a styrene-based hollow filler is preferable. more preferred. These may be used alone or in combination of two or more.
• the content of the filler contained in the adhesive composition of the present invention is preferably 0.5 to 25 parts by volume with respect to 100 parts by volume of the resin composition, and 1 to 15 parts by volume with respect to 100 parts by volume of the resin composition. is more preferable.
• the shape of the filler is not particularly limited and can be appropriately selected depending on the purpose.
• the inorganic filler may be a spherical inorganic filler or a non-spherical inorganic filler, but a non-spherical inorganic filler is preferable from the viewpoint of coefficient of thermal expansion (CTE) and film strength.
• the shape of the non-spherical inorganic filler may be any three-dimensional shape other than a spherical shape (substantially spherical shape), and examples thereof include plate-like, scale-like, columnar, chain-like, and fibrous shapes. Among them, from the viewpoint of coefficient of thermal expansion (CTE) and film strength, plate-like and scale-like inorganic fillers are preferable, and plate-like inorganic fillers are more preferable.
• tackifiers examples include coumarone-indene resin, terpene resin, terpene-phenol resin, rosin resin, pt-butylphenol-acetylene resin, phenol-formaldehyde resin, xylene-formaldehyde resin, petroleum-based hydrocarbon resin, Examples include hydrogenated hydrocarbon resins and turpentine resins. These tackifiers may be used alone or in combination of two or more.
• the above flame retardant may be either an organic flame retardant or an inorganic flame retardant.
• organic flame retardants include melamine phosphate, melamine polyphosphate, guanidine phosphate, guanidine polyphosphate, ammonium phosphate, ammonium polyphosphate, amide ammonium phosphate, amide ammonium polyphosphate, carbamate phosphate, and carbamate polyphosphate.
• triazine compounds such as melamine,
• Inorganic flame retardants include metal hydroxides such as aluminum hydroxide, magnesium hydroxide, zirconium hydroxide, barium hydroxide, and calcium hydroxide; tin oxide, aluminum oxide, magnesium oxide, zirconium oxide, zinc oxide, Metal oxides such as molybdenum oxide and nickel oxide; zinc carbonate, magnesium carbonate, barium carbonate, zinc borate, hydrated glass and the like. These flame retardants can be used in combination of two or more.
• heat antiaging agent examples include 2,6-di-tert-butyl-4-methylphenol, n-octadecyl-3-(3′,5′-di-tert-butyl-4′-hydroxyphenyl)propione.
• examples of the inorganic filler include powders made of titanium oxide, aluminum oxide, zinc oxide, carbon black, silica, copper, silver, and the like. These may be used alone or in combination of two or more.
• the curing agent can increase the storage modulus of the adhesive composition by reacting with the resin composition or by polymerization between the curing agents, and by increasing the crosslink density of the resin composition, high adhesion to the adherend It is possible to express the heat resistance of the adhesive cured product.
• the curing agent is composed of a cross-linking agent that reacts with the resin composition to form a cross-linked structure, and may optionally contain a reaction accelerator that accelerates the reaction between the resin composition and the cross-linking agent.
• the content of the curing agent is preferably 20 parts by mass or less with respect to 100 parts by mass of the resin composition from the viewpoint of ensuring both high adhesion and low dielectric.
• cross-linking agent examples include benzoxazine resins, bismaleimide resins, epoxy resins, isocyanate resins, phenol resins, cyanate resins, polyamides, polyurethanes, organic peroxides, silane coupling agents, and the like.
• the cross-linking agent can be appropriately selected depending on the purpose, but benzoxazine resins and epoxy resins are preferable from the viewpoint that the adhesive composition can be cured at an appropriate curing temperature and heat resistance can be exhibited. From the viewpoint of improving the cross-linking density of the adhesive composition without containing a highly polar functional group and further improving the adhesiveness (adhesiveness) and heat resistance of the adhesive layer, bismaleimide resin is preferable. preferable. Only one type of cross-linking agent may be used, or two or more types may be contained.
• Benzoxazine resin reacts with styrene elastomers containing carboxyl groups, styrene elastomers containing amino groups, bismaleimide resins, etc., so that the crosslink density is improved and the adhesion and heat resistance of the adhesive layer are improved. can be given.
• Benzoxazine resins include, for example, 6,6-(1-methylethylidene)bis(3,4-dihydro-3-phenyl-2H-1,3-benzoxazine), 6,6-(1-methylethylidene) Examples thereof include bis(3,4-dihydro-3-methyl-2H-1,3-benzoxazine) and the like, and two or more of them may be combined.
• a phenyl group, a methyl group, a cyclohexyl group, or the like may be bonded to the nitrogen of the oxazine ring.
• benzoxazine resins include “Benzoxazine Fa” and “Benzoxazine Pd” manufactured by Shikoku Kasei Co., Ltd., and “Benzoxazine ALP-d” manufactured by Tohoku Kako Co., Ltd. "Cashew benzoxazine resin CR-276" and the like.
• the bismaleimide resin has a structure with two maleimide groups, and since it contains maleimide groups, it has improved adhesion to metals. In addition, since it has an unsaturated bond, it can be crosslinked, and reacts with the carboxy group in the styrene elastomer containing the carboxy group, the amino group in the styrene elastomer containing the amino group, benzoxazine resin, etc. Therefore, by improving the cross-linking density, it is possible to realize further adhesion and stable heat resistance.
• bismaleimide resins examples include 1-methyl-2,4-bismaleimidebenzene, N,N'-m-phenylenebismaleimide, N,N'-p-phenylenebismaleimide, N,N'-m-toluene.
• epoxy resin reacts with the carboxy group in the styrene elastomer containing the carboxy group and the amino group in the styrene elastomer containing the amino group, resulting in high adhesion to the adherend and heat resistance of the cured adhesive. It is a component that expresses sexuality.
• epoxy resins include bisphenol A type epoxy resins, bisphenol F type epoxy resins, or hydrogenated versions thereof; diglycidyl phthalate, diglycidyl isophthalate, diglycidyl terephthalate, p-hydroxybenzoic acid Glycidyl ester epoxy resins such as glycidyl ester, diglycidyl tetrahydrophthalate, diglycidyl succinate, diglycidyl adipate, diglycidyl sebacate, and triglycidyl trimellitate; ethylene glycol diglycidyl ether, propylene glycol Diglycidyl ether, 1,4-butanediol diglycidyl ether, 1,6-hexanediol diglycidyl ether, trimethylolpropane triglycidyl ether, pentaerythritol tetraglycidyl ether, tetraphenylglycidyl ether e
• Novolac epoxy resins such as xylene structure-containing novolac epoxy resins, naphthol novolac epoxy resins, phenol novolak epoxy resins, o-cresol novolak epoxy resins, and bisphenol A novolak epoxy resins can also be used. These epoxy resins may be used alone or in combination of two or more.
• novolak-type epoxy resins include Mitsubishi Chemical Corporation's "YX7700” (xylene structure-containing novolak-type epoxy resin), Nippon Kayaku Co., Ltd.'s "NC7000L” (naphthol novolak-type epoxy resin), "ESN485" (naphthol novolak type epoxy resin) manufactured by Nippon Steel Chemical & Materials Co., Ltd., "N-690” (cresol novolac type epoxy resin) manufactured by DIC Corporation, "N-695" manufactured by DIC Corporation ( cresol novolak type epoxy resin) and the like.
• the epoxy resin is more preferably an epoxy-modified resin. This is because it has good compatibility with a main agent (resin composition) containing a styrene-based elastomer, and can exhibit an effect of suppressing resin flow without impairing the effect of adjusting the MFR of the main agent.
• Epoxy-modified resins having a structure represented by the following formula (1) have an epoxy structure and a carboxy group in a styrene-based elastomer containing the above carboxy group and styrene containing the above amino group, compared with ordinary epoxy resins. It reacts with amino groups in the system elastomer or self-polymerizes at a high reaction rate, and is effective as a component that exhibits high adhesiveness to adherends and heat resistance of cured adhesives.
• a preferred embodiment of the epoxy-modified resin is an epoxy-modified resin having a structure represented by the following formula (2).
• R 5 and R 6 each independently represent hydrogen or an alkyl group having 10 or less carbon atoms.
• each formula Each R 5 in (2) may be the same or different, each R 6 in formula (2) may be the same or different, and * represents a bonding group.
• both R 5 and R 6 are more preferably hydrogen from the viewpoint of reducing steric hindrance near the epoxy group and allowing the reaction to proceed sufficiently.
• the epoxy-modified resin preferably contains an unsaturated bond in addition to an olefin skeleton and an aromatic ring such as a vinyl group.
• Unsaturated bonds other than aromatic rings such as olefin skeletons and vinyl groups can be incorporated into reactions involving epoxy groups to accelerate the reaction rate and increase the crosslink density. As a result, heat resistance and chemical resistance can be improved even with a small amount.
• cross-linking unsaturated bonds other than aromatic rings by radical polymerization the cross-linking density of the epoxy-modified resin can be increased, and heat resistance and chemical resistance can be improved.
• a preferred embodiment of the epoxy-modified resin is an epoxy-modified resin having a structure represented by the following formula (3).
• R 7 and R 8 each independently represent hydrogen or an alkyl group having 10 or less carbon atoms.
• each formula R 7 in (3) may be the same or different, and R 8 in each formula (3) may be the same or different, * represents a bonding group.
• both R 7 and R 8 are more preferably hydrogen.
• the epoxy-modified resin is preferably an epoxy-modified resin having a structure represented by the above formula (1) and a structure represented by the above formula (3), and the structure represented by the above formula (2) and the above formula It is more preferable that it is an epoxy-modified resin having the structure represented by (3).
• a preferred embodiment of the epoxy-modified resin includes an epoxy-modified resin having at least one of the structure represented by the following formula (4) and the structure represented by the following formula (5). It is also preferable to have both a structure represented by the following formula (4) and a structure represented by the following formula (5).
• R 9 and R 10 each independently represent hydrogen or an alkyl group having 10 or less carbon atoms.
• each formula Each R 9 in (4) may be the same or different, each R 10 in formula (4) may be the same or different, and * represents a bonding group.
• both R 9 and R 10 are more preferably hydrogen.
• R 11 and R 12 each independently represent hydrogen or an alkyl group having 10 or less carbon atoms.
• each formula R 11 in (5) may be the same or different
• R 12 in each formula (5) may be the same or different
• both R 11 and R 12 are more preferably hydrogen.
• the epoxy-modified resin is preferably an epoxy-modified organic compound obtained by modifying an organic compound containing an unsaturated bond.
• the structure represented by the above formula (1) and the unsaturated bond can coexist in the molecule depending on the modification rate, and the reaction of the epoxy structure can be performed with an olefin skeleton or It is easy to impart the effect of an unsaturated bond to a ring other than an aromatic ring such as a vinyl group.
• a reaction in which an epoxy skeleton is formed with a peroxide is effective.
• Peroxides used include percarboxylic acid compounds such as performic acid, peracetic acid and perpropionic acid.
• the epoxy-modified resin is preferably an epoxy-modified elastomer obtained by modifying an elastomer containing unsaturated bonds. Epoxy-modified elastomer can give flexibility to the cured product, and by suppressing the deterioration of the toughness of the cured product due to epoxy curing, it is possible to maintain adhesion when the laminate is bent, and improve heat resistance and chemical resistance. do not lower.
• the epoxy-modified resin is preferably a styrene-based elastomer.
• the epoxy-modified resin is also a styrene-based elastomer, so that when mixing the two, the compatibility is improved, and the styrene-based elastomer containing the carboxy group is improved. This is because the reaction with the carboxyl group in the polymer or the amino group in the styrene-based elastomer containing the amino group can proceed efficiently.
• the epoxy-modified resin is preferably a styrene-based elastomer.
• the epoxy-modified resin having the structure represented by the formula (1) or the formula (2) preferably has a structural unit of styrene in addition to the structures represented by the formulas (3) to (5). .
• the epoxy-modified resin is also a styrene-based elastomer, so that when mixing the two, the compatibility is improved, and the styrene-based elastomer containing the carboxy group is improved. This is because the reaction with the carboxyl group in the polymer or the amino group in the styrene-based elastomer containing the amino group can proceed efficiently.
• Epoxy-modified resins include alicyclic epoxy compounds having an alicyclic epoxy group such as epoxycyclohexane, epoxidized polybutadiene, epoxy compounds of styrene-butadiene block copolymers, and the like. Among them, an epoxy compound of a styrene-butadiene block copolymer is more preferable. Since the styrene-butadiene block copolymer contains an unsaturated bond, the structure represented by the above formula (1) and the unsaturated bond can coexist in the molecule. It is easy to impart the effect of unsaturated bonds to groups other than aromatic rings. As the epoxy-modified resin, commercially available epoxy compounds can also be used. Friend AT501 and Epo Friend CT310 (manufactured by Daicel) can be mentioned.
• the weight average molecular weight (Mw) of the epoxy-modified resin is preferably 30,000 or more, more preferably 50,000 or more.
• the weight-average molecular weight is 30,000 or more, the softening of the adhesive composition can be suppressed, and the resin can be prevented from flowing during thermocompression bonding.
• the weight average molecular weight is 50,000 or more, the flexibility of the epoxy-modified resin is improved, and the toughness of the cured product is improved.
• the weight average molecular weight (Mw) of the epoxy-modified resin is preferably 200,000 or less, more preferably 160,000 or less. If the weight average molecular weight is 200,000 or less, the compatibility with the styrene elastomer is further improved. If the weight-average molecular weight is 160,000 or less, the storage elastic modulus of the adhesive composition can be lowered, and the shape of the adherend can be followed.
• the cross-linking density of the adhesive composition is improved without containing a highly polar functional group, and the adhesion (adhesiveness), heat resistance and chemical resistance of the adhesive layer are improved.
• Unsaturated bonds, acryloyl groups, and bismaleimide groups contained in the resin composition, and unsaturated bonds other than aromatic rings such as olefin skeletons and vinyl groups contained in the above-mentioned epoxy-modified resin are radicals generated from organic peroxides.
• the resin component can be cross-linked even by radical polymerization by , and the adhesion (adhesiveness), heat resistance, and chemical resistance of the adhesive layer can be further improved.
• radicals generated from organic peroxides have high hydrogen abstraction ability and can crosslink hydrogenated styrene elastomers, the crosslink density of the adhesive composition is further improved without containing highly polar functional groups. can do.
• organic peroxides examples include benzoyl peroxide, lauroyl peroxide, t-butylperoxypivalate, t-butylperoxyethylhexanoate, 1,1'-bis-(t-butylperoxy)cyclohexane, t-amyl
• organic peroxides such as peroxy-2-ethylhexanoate and t-hexylperoxy-2-ethylhexanoate are included.
• the coupling agent examples include vinyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, p-styryltrimethoxysilane, 3-methacryloxypropylmethyldimethoxysilane, 3-acryloxypropyltrimethoxysilane, N -2-(aminoethyl)-3-aminopropylmethyldimethoxysilane, 3-ureidopropyltriethoxysilane, 3-mercaptopropylmethyldimethoxysilane, bis(triethoxysilylpropyl)tetrasulfide, 3-isocyanate-topropyltri Examples include silane coupling agents such as ethoxysilane and imidazole silane; titanate coupling agents; aluminate coupling agents; and zirconium coupling agents. These may be used alone or in combination of two or more.
• the reaction accelerator is used, for example, for the purpose of promoting the reaction between the styrene-based elastomer, particularly the modified styrene-based elastomer, and the cross-linking agent.
• a reaction accelerator for example, a tertiary amine-based reaction accelerator, a tertiary amine salt-based reaction accelerator, an imidazole-based reaction accelerator, and the like can be used.
• Tertiary amine reaction accelerators include benzyldimethylamine, 2-(dimethylaminomethyl)phenol, 2,4,6-tris(dimethylaminomethyl)phenol, tetramethylguanidine, triethanolamine, N,N' -dimethylpiperazine, triethylenediamine, 1,8-diazabicyclo[5.4.0]undecene and the like.
• Tertiary amine salt-based reaction accelerators include 1,8-diazabicyclo[5.4.0]undecene formate, octylate, p-toluenesulfonate, o-phthalate, phenol salt or Phenol novolak resin salts, 1,5-diazabicyclo[4.3.0]nonene formate salts, octylate salts, p-toluenesulfonate salts, o-phthalate salts, phenol salts or phenol novolak resin salts, etc. mentioned.
• imidazole-based reaction accelerators examples include 2-methylimidazole, 2-undecylimidazole, 2-heptadecylimidazole, 1,2-dimethylimidazole, 2-methyl-4-ethylimidazole, 2-phenylimidazole, 2-phenyl- 4-methylimidazole, 1-benzyl-2-methylimidazole, 1-benzyl-2-phenylimidazole, 2,4-diamino-6-[2′-methylimidazolyl-(1′)]ethyl-s-triazine, 2 ,4-diamino-6-[2′-undecylimidazolyl-(1′)]ethyl-s-triazine, 2,4-diamino-6-[2′-ethyl-4′-methylimidazolyl-(1′) ] Ethyl-s-triazine, 2,4-diamino-6-[2′-
• the adhesive layer according to the present invention is formed using the adhesive composition of the present invention.
• the adhesive composition that forms the adhesive layer can be cured.
• the curing method is not particularly limited and can be appropriately selected depending on the purpose. Examples thereof include heat curing.
• the thickness of the adhesive layer is not particularly limited and can be appropriately selected depending on the intended purpose. Also, it is preferably 100 ⁇ m or less, more preferably 50 ⁇ m or less, and even more preferably 30 ⁇ m or less. If the thickness of the adhesive layer is 3 ⁇ m or more, sufficient adhesive strength can be exhibited, and if it is 5 ⁇ m or more, steps such as the pattern of the printed wiring board can be followed. If the thickness of the adhesive layer is 50 ⁇ m or less, the laminate can be made thinner, and if it is 30 ⁇ m or less, the resin flow can be accurately controlled.
• An adhesive layer can be produced by forming a film from the adhesive composition.
• the adhesive composition can be produced by mixing the resin composition containing each of the styrene-based elastomers described above and a curing agent.
• the mixing method is not particularly limited as long as the adhesive composition becomes uniform. Since the adhesive composition is preferably used in the form of a solution or dispersion, a solvent is also usually used.
• solvents examples include alcohols such as methanol, ethanol, isopropyl alcohol, n-propyl alcohol, isobutyl alcohol, n-butyl alcohol, benzyl alcohol, ethylene glycol monomethyl ether, propylene glycol monomethyl ether, diethylene glycol monomethyl ether, and diacetone alcohol.
• alcohols such as methanol, ethanol, isopropyl alcohol, n-propyl alcohol, isobutyl alcohol, n-butyl alcohol, benzyl alcohol, ethylene glycol monomethyl ether, propylene glycol monomethyl ether, diethylene glycol monomethyl ether, and diacetone alcohol.
• Ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, methyl amyl ketone, cyclohexanone, and isophorone; Aromatic hydrocarbons such as toluene, xylene, ethylbenzene, and mesitylene; Methyl acetate, ethyl acetate, butyl acetate, ethylene glycol monomethyl ether acetate; -, 3-methoxybutyl acetate; and aliphatic hydrocarbons such as hexane, heptane, cyclohexane, and methylcyclohexane. These solvents may be used alone or in combination of two or more.
• the adhesive layer can be made uniform.
• the adhesive composition is a solvent-containing solution or dispersion (resin varnish)
• coating on the substrate film and formation of the adhesive layer can be performed smoothly, and an adhesive layer having a desired thickness can be formed. can be obtained easily.
• the adhesive composition contains a solvent
• the solid content concentration is preferably in the range of 3 to 80% by mass, more preferably 10 to 50% by mass, from the viewpoint of workability including formation of the adhesive layer.
• the solid content concentration is 80% by mass or less, the viscosity of the solution is moderate, and it is easy to apply uniformly.
• a resin varnish containing the adhesive composition and a solvent is applied to the surface of a substrate film to form a resin varnish layer, and then the resin varnish is applied to the surface of the substrate film.
• a B-staged adhesive layer can be formed by removing the solvent from the layer.
• the adhesive layer being in a B-stage state means that the adhesive composition is in an uncured state or a semi-cured state in which a part of the adhesive composition has begun to cure, and the curing of the adhesive composition further progresses by heating or the like. It means the state to do.
• the method for applying the resin varnish on the substrate film is not particularly limited and can be appropriately selected according to the purpose.
• a blade coating method, a doctor roll method, a doctor blade method, a curtain coating method, a slit coating method, a screen printing method, an inkjet method, a dispensing method, and the like can be mentioned.
• the B-stage adhesive layer can be further subjected to heating or the like to form a cured adhesive layer.
• the dielectric constant ( ⁇ r) of the adhesive layer obtained by curing the adhesive composition of the present invention at a frequency of 28 GHz is preferably 3.5 or less, more preferably 2.7 or less.
• the dielectric loss tangent (tan ⁇ ) of the adhesive layer at a frequency of 28 GHz is preferably 0.005 or less, more preferably 0.0025 or less, and even more preferably 0.002 or less. If the dielectric constant is 3.5 or less and the dielectric loss tangent is 0.005 or less, it can also be used for high-frequency FPC-related products that require strict electrical characteristics.
• the dielectric constant is 2.7 or less and the dielectric loss tangent is 0.0025 or less, it is possible to satisfy the electrical characteristics expected for the components of 5G compatible high-frequency FPC-related products, and it is equivalent to LCP. , and can be suitably used for 5G high-frequency FPC-related products that have strict requirements for electrical characteristics. Furthermore, if the dielectric loss tangent is 0.002 or less, it is possible to manufacture high-frequency FPC-related products with further improved transmission characteristics.
• the storage elastic modulus at 25° C. of the adhesive layer obtained by curing the adhesive composition of the present invention is preferably 1.5 ⁇ 10 7 to 3.0 ⁇ 10 7 .
• the storage elastic modulus at 25°C after the adhesive layer is kept at 150°C for 168 hours is preferably 1.5 ⁇ 10 7 to 3.0 ⁇ 10 7 .
• the storage modulus value should be neither too high nor too low, and should maintain a good enough storage modulus to contribute to adhesion. If the storage modulus of the adhesive layer is within the above range, the resin composition used in the present invention can sufficiently exhibit the effect of suppressing fluctuations in storage modulus after 168 hours at 150°C.
• the laminate of the present invention comprises a base film and the adhesive layer on at least one surface of the base film.
• the base film used in the present invention can be selected according to the use of the laminate.
• the laminate when the laminate is used as a cover lay film or a copper clad laminate (CCL), polyimide film, polyether ether ketone film, polyphenylene sulfide film, aramid film, polyethylene naphthalate film, liquid crystal polymer film, and the like can be used.
• polyimide film, polyetheretherketone (PEEK) film, polyethylene naphthalate film, and liquid crystal polymer film are preferred from the viewpoint of adhesion and electrical properties.
• the storage elastic modulus of the base film at 200° C. is 1 ⁇ 10 8 or more. Resin flow is accompanied by deformation of the edges of the base film, and the larger the deformation, the greater the resin flow.
• the base film when used as a bonding sheet, the base film must be a release film, and examples thereof include polyethylene terephthalate film, polyethylene film, polypropylene film, silicone release treated paper, and polyolefin resin. Coated paper, TPX (polymethylpentene) film, fluorine-based resin film, and the like.
• the base film When the laminate of the present invention is used as a shielding film, the base film must be a film having electromagnetic wave shielding ability, and examples thereof include a laminate of a protective insulating layer and a metal foil.
• coverlay film A preferred embodiment of the laminate according to the present invention is a coverlay film.
• a laminate having an adhesive layer called a "coverlay film” is usually used to protect the wiring portion.
• This coverlay film comprises an insulating resin layer and an adhesive layer formed on its surface.
• a coverlay film is a laminate in which the adhesive layer is formed on at least one surface of the base film, and it is generally difficult to separate the base film and the adhesive layer.
• the thickness of the base film included in the coverlay film is preferably 5 to 100 ⁇ m, more preferably 5 to 50 ⁇ m, even more preferably 5 to 30 ⁇ m. If the thickness of the base film is equal to or less than the above upper limit, the thickness of the coverlay film can be reduced.
• the printed wiring board can be easily designed and handled well.
• a method for producing a coverlay film for example, a resin varnish containing the adhesive composition and a solvent is applied to the surface of the base film to form a resin varnish layer, and then the solvent is removed from the resin varnish layer. is removed, a coverlay film having a B-stage adhesive layer formed thereon can be produced.
• the drying temperature for removing the solvent is preferably 40 to 250°C, more preferably 70 to 170°C. Drying is performed by passing the laminate coated with the adhesive composition through a furnace in which hot air drying, far-infrared heating, high-frequency induction heating, or the like is performed.
• a release film may be laminated on the surface of the adhesive layer for storage or the like.
• the releasable film publicly known films such as polyethylene terephthalate film, polyethylene film, polypropylene film, silicone release treated paper, polyolefin resin coated paper, TPX film, and fluororesin film are used. Since the coverlay film according to the present invention uses the low-dielectric adhesive composition of the present invention, it is possible for high-speed transmission of electronic devices, and furthermore, it has excellent adhesive stability with electronic devices. Become.
• a preferred embodiment of the laminate according to the present invention is a bonding sheet.
• the bonding sheet is obtained by forming the adhesive layer on the surface of a release film (base film).
• the bonding sheet may be in a mode in which an adhesive layer is provided between two release films.
• the release film is peeled off before use.
• the releasable film the same one as described in the above section (coverlay film) can be used.
• the thickness of the base film included in the bonding sheet is preferably 5 to 100 ⁇ m, more preferably 25 to 75 ⁇ m, even more preferably 38 to 50 ⁇ m. If the thickness of the base film is within the above range, the bonding sheet can be easily manufactured and handled well.
• a method for producing a bonding sheet for example, there is a method of applying a resin varnish containing the adhesive composition and a solvent to the surface of a release film and drying in the same manner as in the case of the coverlay film. Since the bonding sheet according to the present invention uses the low-dielectric adhesive composition of the present invention, it is capable of high-speed transmission of electronic devices, and has excellent adhesion stability with electronic devices. .
• a preferred embodiment of the laminate according to the present invention is a copper-clad laminate obtained by bonding a copper foil to the adhesive layer in the laminate according to the present invention.
• a copper-clad laminate is obtained by laminating copper foil using the above laminate, and is composed of, for example, a substrate film, an adhesive layer and copper foil in this order.
• the adhesive layer and the copper foil may be formed on both sides of the base film.
• the adhesive composition used in the present invention also has excellent adhesion to articles containing copper. Since the copper-clad laminate according to the present invention uses the low-dielectric adhesive composition of the present invention, it enables high-speed transmission of electronic devices and has excellent adhesion stability.
• the adhesive layer and copper foil of the laminate are brought into surface contact, thermal lamination is performed at 80° C. to 200° C., and the adhesive layer is cured by after-curing.
• the after-curing conditions can be, for example, 100° C. to 200° C. for 30 minutes to 4 hours in an inert gas atmosphere.
• the said copper foil is not specifically limited, Electrolytic copper foil, a rolled copper foil, etc. can be used.
• a preferred embodiment of the laminate according to the present invention is a printed wiring board obtained by laminating copper wiring to the adhesive layer in the laminate according to the present invention.
• a printed wiring board is obtained by forming an electronic circuit on the copper-clad laminate.
• a printed wiring board is formed by laminating a substrate film and copper wiring using the laminate, and is composed of a substrate film, an adhesive layer, and copper wiring in this order.
• the adhesive layer and the copper wiring may be formed on both sides of the base film.
• a printed wiring board is manufactured by using a hot press or the like to attach a coverlay film to a surface having a wiring portion via an adhesive layer.
• the printed wiring board according to the present invention uses the low-dielectric adhesive composition of the present invention, it enables high-speed transmission of electronic devices and has excellent adhesion stability.
• the adhesive layer of the laminate is brought into contact with the copper wiring, thermal lamination is performed at 80 ° C. to 200 ° C., and the adhesive layer is removed by after-curing. There is a way to harden it.
• the after-cure conditions can be, for example, 100° C. to 200° C. and 30 minutes to 4 hours.
• the shape of the copper wiring is not particularly limited, and any suitable shape may be selected as desired.
• a preferred embodiment of the laminate according to the present invention is a shield film.
• a shield film is a film for shielding various electronic devices in order to cut electromagnetic noise that affects various electronic devices such as computers, mobile phones, and analytical instruments and causes malfunctions. Also called electromagnetic wave shielding film.
• the electromagnetic wave shielding film is formed by laminating an insulating resin layer, a metal layer, and an adhesive layer according to the present invention in this order, for example. Since the shielding film according to the present invention uses the low dielectric adhesive composition of the present invention, high-speed transmission of electronic devices is possible, and the adhesive stability with electronic devices is also excellent. .
• a preferred embodiment of the laminate according to the present invention is a printed wiring board with a shield film.
• a printed wiring board with a shielding film is a printed wiring board having a printed circuit on at least one side of a substrate, and the electromagnetic wave shielding film is attached on the printed wiring board.
• a printed wiring board with a shield film includes, for example, a printed wiring board, an insulating film adjacent to the surface of the printed wiring board on which the printed circuit is provided, and the electromagnetic wave shielding film. Since the printed wiring board with a shielding film according to the present invention uses the low-dielectric adhesive composition of the present invention, it enables high-speed transmission of electronic devices and has excellent adhesion stability.
• This copolymer has a styrene ratio of 30 and a weight average molecular weight of 78,000.
• the total nitrogen content in this copolymer was 430 ppm ( ⁇ g/g).
• (Unmodified styrene elastomer) A product name "A1535" (hydrogenated styrene-butadiene copolymer) manufactured by Kraton was used.
• the styrene ratio of this copolymer is 58 and the weight average molecular weight is 135,700.
• (Unmodified styrene elastomer) A product name "A1536" (hydrogenated styrene-butadiene copolymer) manufactured by Kraton was used.
• the styrene ratio of this copolymer is 42 and the weight average molecular weight is 140,506.
• (Unmodified styrene elastomer) Asahi Kasei Co., Ltd. trade name "Tuftec P1500" (hydrogenated styrene elastomer) was used.
• This copolymer has a styrene ratio of 30 and a weight average molecular weight of 67,000.
• Unmodified styrene elastomer A trade name “Kraton G1651” (styrene-ethylenebutylene-styrene block copolymer) manufactured by Kraton Co., Ltd. was used.
• the styrene ratio of this copolymer is 33 and the weight average molecular weight is 136,700.
• Harddener: epoxy modified resin A trade name “Epofriend CT310” (epoxidized styrene-butadiene block copolymer) manufactured by Daicel Corporation was used.
• This copolymer has a styrene/ethylene butylene ratio of 40/60, a weight average molecular weight of 93,000 and an epoxy equivalent of 2125 g/eq. is.
• (Curing agent: bismaleimide resin) A trade name “SLK-3000-T50” manufactured by Shin-Etsu Chemical Co., Ltd. was used. It has a weight average molecular weight of 138,77.
• electrolytic copper foil As the electrolytic copper foil, “TQ-M7-VSP” manufactured by Mitsui Kinzoku Mining (electrolytic copper foil, thickness 12 ⁇ m, glossy surface Rz 1.27 ⁇ m, glossy surface Ra 0.197 ⁇ m, glossy surface Rsm 12.95 ⁇ m) was used.
• the surface roughness of the glossy surface is a value determined based on JIS B 0601:2013 (ISO 4287:1997 Amd.1:2009) from the roughness curve measured using a laser microscope. .
• release film As the release film, NP75SA (silicone release PET film, 75 ⁇ m) manufactured by Panac was used.
• Example 1 Each component constituting the adhesive layer shown in Table 1 was contained in the ratio shown in Table 1, and these components were dissolved in a solvent to prepare a resin varnish, which is an adhesive composition having a solid content concentration of 15% by mass. Each component constituting the resin composition in the adhesive composition is as shown in Table 1. Table 1 also shows the content ratio of the resin composition and the curing agent.
• the adhesive layer obtained by curing the resin varnish of Example 1 was measured for dielectric constant and dielectric loss tangent at a frequency of 28 GHz.
• the elastic modulus at 25° C. of the adhesive layer obtained by curing the resin varnish of Example 1 was measured.
• the storage elastic modulus of the adhesive layer obtained by curing the resin varnish of Example 1 was measured after 168 hours at 150°C.
• the relative dielectric constant and dielectric loss tangent of the adhesive layer were determined by the open resonator method using a network analyzer MS46122B (manufactured by Anritsu) and an open resonator Fabry-Perot DPS-03 (manufactured by KEYCOM) at a temperature of 23°C. , and a frequency of 28 GHz.
• a resin varnish is applied on the release film by a roll, and then the film with the coating film is left standing in an oven and dried at 110 ° C. for 4 minutes to form a B-stage adhesive layer. (thickness 50 ⁇ m). Next, this adhesive layer was thermally laminated at 150° C.
• the storage elastic modulus of the adhesive layer was measured by preparing an adhesive film having a thickness of 100 ⁇ m and using a viscoelasticity measuring device (RSA-G2 manufactured by TA Instruments) with a measurement frequency of 1 Hz and a heating rate. Measured according to JIS K7244 under conditions of 5° C./min. The measurement sample was obtained by roll-coating a resin varnish on a release film, and then leaving the coated film in an oven. A B-stage adhesive layer (thickness: 50 ⁇ m) was formed by drying at 110° C. for 4 minutes, then heat-laminating the adhesive layer at 120° C. so that the adhesive surfaces were in contact with each other.
• RSA-G2 viscoelasticity measuring device
• a film (thickness of 100 ⁇ m) was formed to prepare a pre-curing adhesive film (100 mm ⁇ 100 mm).
• the release film was peeled off from the adhesive film, and the storage modulus (Pa) of the pre-curing adhesive layer was measured.
• the pre-cured adhesive film (thickness: 100 ⁇ m) was placed in an oven and heat-cured at 150° C. for 60 minutes to prepare a post-cured adhesive film (100 mm ⁇ 100 mm).
• the release film was peeled off from the adhesive film, and the storage elastic modulus (Pa) of the cured adhesive layer was measured.
• the storage elastic modulus (Pa) of the cured adhesive layer was measured after 168 hours at 150°C.
• a laminate with an adhesive after curing was produced by the following method. Corona treatment was performed on the surface of the base film.
• the resin varnish prepared above is applied to the surface of the base film, dried in an oven at 130°C for 4 minutes, and the solvent is volatilized to form an adhesive layer (25 ⁇ m), and the base film with adhesive (adhesive A laminated body with an agent) was obtained.
• the adhesive layer of the adhesive-attached laminate was placed in contact with the glossy surface of the electrolytic copper foil, and thermal lamination was performed at 150° C. to obtain an adhesive-attached laminate before curing.
• the laminate with adhesive before curing was post-cured at 150° C. for 1 hour to cure the adhesive layer to obtain a laminate with adhesive after curing.
• the initial adhesive strength (N/cm) between the electrodeposited copper foil and the substrate film of the laminate with adhesive after curing in Example 1 was measured.
• Adhesion (N/cm) was measured after the heat resistance test when the laminated body with the adhesive after curing in Example 1 was allowed to pass at 150° C. for 168 hours.
• a solder heat resistance test was performed on the laminated body with the adhesive after curing in Example 1.
• the resin flow (resin outflow property) (mm) of the laminate with adhesive after curing in Example 1 was measured.
• Adhesion strength was determined by cutting the laminate with adhesive after curing into a test specimen with a width of 25 mm, and peeling at a peel speed of 0.3 m / min in accordance with JIS Z0237: 2009 (adhesive tape/adhesive sheet test method). Adhesion was measured by measuring the peel strength when the electrolytic copper foil was peeled off from the adhesive-attached substrate film fixed to the support at an angle of 180°.
• Adhesion after heat resistance test (N/cm)
• the adhesive strength after the heat resistance test was measured by cutting the laminated body with the adhesive after curing into a test piece with a width of 25 mm, and after 168 hours at 150 ° C., JIS Z0237: 2009 (adhesive tape / adhesive sheet test method). Then, by measuring the peel strength when peeling the electrolytic copper foil from the base film with adhesive fixed to the support at a peeling speed of 0.3 m / min and a peeling angle of 180 °, the adhesive strength after the heat resistance test was measured. was measured.
• solder heat resistance test In the solder heat resistance test, the laminate with adhesive after curing is cut into a 30 mm ⁇ 30 mm test specimen, and the base film surface is floated in a solder bath at 288 ° C. for 10 seconds ⁇ 3 times, and the adhesive layer Appearance abnormalities such as swelling and peeling were confirmed.
• the heat resistance of the laminate was evaluated according to the following evaluation criteria. ⁇ No abnormality (no dissolution). ⁇ Although there was no abnormality in the end, softening of the adhesive layer was observed during the test. ⁇ : The adhesive layer was not peeled off, but the adhesive layer was softened and a “stain pattern” was formed. x: Peeled off.
• Table 1 shows each measurement result.
• Laminates of Examples 2 to 13 were prepared in the same manner as in Example 1, except that the types and amounts of the components constituting the adhesive layer were changed as shown in Tables 1 and 2. was made. Evaluation similar to Example 1 was performed with respect to the produced laminated body. The results are shown in Tables 1 and 2.
• Comparative Examples 1 to 4 Laminates of Comparative Examples 1 to 4 were produced in the same manner as in Example 1, except that the types and amounts of the components constituting the adhesive layer were changed as shown in Table 2. . Evaluation similar to Example 1 was performed with respect to the produced laminated body. Table 2 shows the results.
• the adhesive layer made of the adhesive composition of the present invention exhibits good electrical properties (dielectric properties) compatible with 5G, adhesion, heat resistance, resin flow (resin flow-out property). ), and shows excellent adhesion reliability even after 168 hours at 150°C.
• a laminate having an adhesive layer comprising the adhesive composition of the present invention is suitable for manufacturing FPC-related products for electronic devices such as smartphones, mobile phones, optical modules, digital cameras, game machines, laptop computers, and medical instruments. can be used for

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