WO2017077912A1 - 低誘電難燃性接着剤組成物 - Google Patents
低誘電難燃性接着剤組成物 Download PDFInfo
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- WO2017077912A1 WO2017077912A1 PCT/JP2016/081678 JP2016081678W WO2017077912A1 WO 2017077912 A1 WO2017077912 A1 WO 2017077912A1 JP 2016081678 W JP2016081678 W JP 2016081678W WO 2017077912 A1 WO2017077912 A1 WO 2017077912A1
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- laminate
- adhesive layer
- resin
- substrate
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- 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
- C09J7/10—Adhesives in the form of films or foils without carriers
-
- 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
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- 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
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- 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
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
-
- 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
- C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
-
- 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
- C09J125/06—Polystyrene
-
- 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
- C09J163/00—Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
-
- 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
- C09J179/00—Adhesives based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen, with or without oxygen, or carbon only, not provided for in groups C09J161/00 - C09J177/00
-
- 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
- C09J201/00—Adhesives based on unspecified macromolecular compounds
-
- 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
-
- 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
-
- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
- B32B2307/204—Di-electric
-
- 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/306—Resistant to heat
- B32B2307/3065—Flame resistant or retardant, fire resistant or retardant
-
- 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
- B32B2457/00—Electrical equipment
- B32B2457/08—PCBs, i.e. printed circuit boards
-
- 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
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
- C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature
Definitions
- the present invention relates to a laminate comprising an adhesive layer having flame retardancy while exhibiting a low dielectric constant and a low dielectric loss tangent. More specifically, the present invention relates to a laminate in which a resin base material and a metal base material are laminated via an adhesive layer exhibiting a low dielectric constant, a low dielectric loss tangent, and flame retardancy. In particular, the present invention relates to a laminate for a flexible printed wiring board (hereinafter abbreviated as FPC), and a coverlay film, a laminate, a copper foil with resin, and a bonding sheet including the laminate.
- FPC flexible printed wiring board
- the adhesive strength is weak when conventional epoxy adhesives or acrylic adhesives are used, so that FPC members such as coverlay films and laminates can be produced.
- FPC members such as coverlay films and laminates
- Patent Documents 1 and 2 epoxy adhesives and acrylic adhesives are not excellent in low dielectric properties and impair the dielectric properties of FPC.
- the adhesive composition used for the above purpose is often flammable and needs to be provided with flame retardancy.
- the flame retardant a system using a halogen-based organic compound has excellent flame retardancy.
- this method has a problem of generating corrosive halogen gas during combustion. Therefore, a halogen-free flame retardant containing no halogen component is required.
- Patent Document 3 states that an organic phosphinate aluminum can be used as a flame retardant, and the range of the flame retardant content in the case where the flame retardant is contained in the coverlay film described in the same document is shown. Has been.
- Patent Document 1 describes adhesiveness between polyimide and rolled copper foil, solder heat resistance, and flame retardancy, but does not mention low dielectric properties and has low dielectric properties such as LCP. It is difficult to obtain adhesiveness with the base film.
- Patent Document 2 describes adhesion between polyimide and copper foil, solder heat resistance, insulation reliability, and flame retardancy, but does not mention dielectric properties, and low dielectric properties such as LCP. There is also no mention of adhesion to a substrate film having.
- Patent Document 3 there is a description of dielectric constant and flame retardancy, but only the adhesiveness between the copper foil and the copper foil is mentioned, and the adhesiveness with the polyimide or the LCP base material is not mentioned. Moreover, it does not mention solder heat resistance required for FPC applications.
- the present invention has an adhesive layer having specific physical properties, not only a conventional polyimide and polyethylene terephthalate film, but also a resin base material having low dielectric properties such as LCP, It has been found that it has excellent adhesion to metal substrates such as copper foil, high solder heat resistance, and low dielectric properties, and has the flame retardancy of VTM-0 based on UL-94 to complete the present invention. Has been reached.
- the present invention provides a laminate having good adhesion to both various resin substrates such as polyimide and LCP and metal substrates, and having excellent heat resistance, low dielectric properties, and flame retardancy.
- the purpose is to do.
- the relative dielectric constant ( ⁇ c ) at a frequency of 1 MHz of the adhesive layer is 3.0 or less
- the dielectric loss tangent (tan ⁇ ) at a frequency of 1 MHz of the adhesive layer is 0.02 or less
- the peel strength between the resin substrate and the metal substrate is 0.5 N / mm or more
- the humidified solder heat resistance of the laminate (Z) is 240 ° C. or higher
- a laminate (Z) wherein the metal substrate is removed from the laminate (Z), and the laminate (X) is VTM-0 in the UL-94 method.
- the relative dielectric constant ( ⁇ c ) at a frequency of 1 MHz of the adhesive layer is 3.0 or less
- the dielectric loss tangent (tan ⁇ ) at a frequency of 1 MHz of the adhesive layer is 0.02 or less
- the peel strength between the resin base material and the metal base material in the laminate is 0.5 N / mm or more
- the humidified solder heat resistance of the laminate is 240 ° C. or more
- An adhesive layer, wherein the laminate (X) in which a resin base material is laminated on one surface of the adhesive layer is VTM-0 in the UL
- An adhesive sheet containing the laminate (Z), laminate (X), laminate (Y) or adhesive layer.
- a printed wiring board including the adhesive sheet as a constituent element.
- the laminate (Z) in which the resin base material and the metal base material are laminated via the adhesive layer containing the carboxyl group-containing polyolefin resin (A) according to the present invention is as follows: (1) Dielectric constant of the adhesive layer at a frequency of 1 MHz ( ⁇ ) is 3.0 or less, (2) the dielectric loss tangent (tan ⁇ ) at a frequency of 1 MHz of the adhesive layer is 0.02 or less, and (3) the peel strength between the resin substrate and the metal substrate is 0. .5 N / mm or more, (4) the humidified solder heat resistance of the laminate (Z) is 240 ° C. or more, and (5) the laminate (X) of the adhesive layer and the resin substrate is the UL-94 method. VTM-0. It has high adhesion to not only conventional polyimide and polyester films, but also low-polarity resin base materials such as LCP and metal base materials, high solder heat resistance, and excellent low dielectric properties and flame retardancy. .
- the laminate in which the resin base material and the metal base material are laminated via the adhesive layer containing the carboxyl group-containing polyolefin according to the present invention satisfies the following (1) to (5).
- the carboxyl group-containing polyolefin resin (A) used in the present invention (hereinafter also simply referred to as component (A)) is not limited, but the polyolefin resin may be at least one of ⁇ , ⁇ -unsaturated carboxylic acid and acid anhydride thereof. It is preferable that it is obtained by grafting.
- the polyolefin resin is a hydrocarbon such as a homopolymer of an olefin monomer exemplified by ethylene, propylene, butene, butadiene, isoprene or the like, or a copolymer with other monomers, and a hydride or halide of the obtained polymer.
- the propylene- ⁇ -olefin copolymer is a copolymer in which ⁇ -olefin is copolymerized mainly with propylene.
- ⁇ -olefin for example, ethylene, 1-butene, 1-heptene, 1-octene, 4-methyl-1-pentene, vinyl acetate or the like can be used. Of these ⁇ -olefins, ethylene and 1-butene are preferred.
- the ratio of the propylene component to the ⁇ -olefin component of the propylene- ⁇ -olefin copolymer is not limited, but the propylene component is preferably 50 mol% or more, and more preferably 70 mol% or more.
- Examples of at least one of ⁇ , ⁇ -unsaturated carboxylic acid and acid anhydrides thereof include maleic acid, itaconic acid, citraconic acid, and acid anhydrides thereof.
- acid anhydrides are preferable, and maleic anhydride is more preferable.
- Specific examples include maleic anhydride-modified polypropylene, maleic anhydride-modified propylene-ethylene copolymer, maleic anhydride-modified propylene-butene copolymer, maleic anhydride-modified propylene-ethylene-butene copolymer, and the like.
- These acid-modified polyolefins can be used alone or in combination of two or more.
- the lower limit of the acid value of the carboxyl group-containing polyolefin resin (A) is preferably 100 equivalents / 10 6 g or more, more preferably 200 from the viewpoints of heat resistance and adhesion to a resin substrate or a metal substrate. Equivalent / 10 6 g or more, more preferably 250 equivalent / 10 6 g. If it is less than the above value, the compatibility with the epoxy resin (D) and the carbodiimide resin (C) is low, and the adhesive strength may not be exhibited. In some cases, the crosslinking density is low and the heat resistance is poor.
- the upper limit is preferably 1000 equivalents / 10 6 g or less, more preferably 700 equivalents / 10 6 g or less, and even more preferably 500 equivalents / 10 6 g or less.
- the adhesiveness may decrease.
- the viscosity and stability of a solution may fall, and pot life property may fall.
- the weight average molecular weight (Mw) of the carboxyl group-containing polyolefin resin (A) is preferably in the range of 10,000 to 180,000. More preferably, it is in the range of 20,000 to 160,000, more preferably in the range of 30,000 to 150,000, particularly preferably in the range of 40,000 to 140,000, and most preferably 50 , 13,000 to 130,000. If it is less than the above value, the cohesive force becomes weak and the adhesiveness may be inferior. On the other hand, when the above value is exceeded, there may be a problem in operability when bonding due to low fluidity.
- the production method of the carboxyl group-containing polyolefin resin (A) is not particularly limited.
- a radical graft reaction that is, a radical species is generated with respect to a polymer that becomes a main chain, and the radical species is used as a polymerization initiation point to produce an unsaturated carboxylic acid. Reaction for graft polymerization of acid and acid anhydride), and the like.
- organic peroxide is not particularly limited, but di-tert-butyl peroxyphthalate, tert-butyl hydroperoxide, dicumyl peroxide, benzoyl peroxide, tert-butyl peroxybenzoate, tert-butyl peroxy- Peroxides such as 2-ethylhexanoate, tert-butyl peroxypivalate, methyl ethyl ketone peroxide, di-tert-butyl peroxide, lauroyl peroxide; azobisisobutyronitrile, azobisisopropionitrile, etc. Examples thereof include azonitriles.
- an adhesive bond layer means the layer of the adhesive composition after apply
- the thickness of an adhesive bond layer is not specifically limited, Preferably it is 5 micrometers or more, More preferably, it is 10 micrometers or more, More preferably, it is 15 micrometers or more. Moreover, it is preferably 200 ⁇ m or less, more preferably 100 ⁇ m or less, and further preferably 50 ⁇ m or less. If the thickness is too thin, sufficient adhesion performance may not be obtained. If the thickness is too thick, drying will be insufficient and residual solvent will tend to increase. There is a problem.
- the method for coating the adhesive composition on the substrate is not particularly limited, and examples thereof include a comma coater and a reverse roll coater.
- an adhesive layer can be provided directly or by a transfer method on a rolled copper foil, which is a printed wiring board constituent material, or a polyimide film.
- the drying conditions are not particularly limited, but the residual solvent ratio after drying is preferably 1% by mass or less. If it exceeds 1% by mass, there is a problem in that the residual solvent is foamed during the printed circuit board press, resulting in blistering.
- the resin base material is not particularly limited as long as the adhesive composition of the present invention can be applied and dried to form an adhesive layer, but a resin base material such as a film-like resin ( Hereinafter, the substrate film layer is also preferable.
- a resin base material such as a film-like resin
- Specific examples include polyester resins, polyamide resins, polyimide resins, polyamideimide resins, liquid crystal polymers (LCP), polyphenylene sulfide, syndiotactic polystyrene, polyolefin resins, and fluorine resins.
- LCP liquid crystal polymers
- polyphenylene sulfide polyphenylene sulfide
- syndiotactic polystyrene polyolefin resins
- fluorine resins fluorine resins.
- Bexter registered trademark
- a polyimide film the Apical (trademark) by Kaneka Corporation is mentioned, for example.
- the thickness of a resin base material Preferably it is 1 micrometer or more, More preferably, it is 3 micrometers or more, More preferably, it is 10 micrometers or more. Moreover, it is preferably 50 ⁇ m or less, more preferably 30 ⁇ m or less, and further preferably 20 ⁇ m or less. If the thickness is too thin, it may be difficult to obtain sufficient electrical performance of the circuit. On the other hand, if the thickness is too thick, the processing efficiency at the time of circuit fabrication may be reduced. Further, the relative dielectric constant ( ⁇ c ) of the resin base material is preferably 5.0 or less, more preferably 4.0 or less, and even more preferably 3.5 or less. The lower limit is not particularly limited, and there is no problem if it is industrially 0.1 or more.
- Metal base material Any conventionally known conductive material that can be used for the circuit board can be used as the metal substrate.
- the material include various metals such as SUS, copper, aluminum, iron, steel, zinc, and nickel, and alloys, plated products, metals treated with other metals such as zinc and chromium compounds, and the like.
- Metal foil is preferable, and copper foil is more preferable.
- the thickness of metal foil Preferably it is 1 micrometer or more, More preferably, it is 3 micrometers or more, More preferably, it is 10 micrometers or more.
- it is preferably 50 ⁇ m or less, more preferably 30 ⁇ m or less, and further preferably 20 ⁇ m or less.
- the metal foil is usually provided in the form of a roll.
- the form of the metal foil used when manufacturing the printed wiring board of this invention is not specifically limited.
- the length is not particularly limited.
- the width is not particularly limited, but is preferably about 250 to 500 cm.
- the laminate (Z) of the present invention is a laminate in which a resin substrate and a metal substrate are laminated via an adhesive layer (a three-layer laminate of resin substrate / adhesive layer / metal substrate).
- (X) is a laminate of resin substrate and adhesive layer (resin substrate / adhesive layer), and laminate (Y) is a laminate of metal substrate and adhesive layer (metal substrate / adhesive) Agent layer).
- the laminate (X), the laminate (Y), and the laminate (Z) may be simply referred to as a laminate.
- Laminated body (X) is obtained by apply
- a laminated body (Y) is obtained by apply
- the laminate (Z) can be obtained by laminating a metal substrate or a resin substrate on the laminate (X) or the laminate (Y), respectively.
- a release substrate can also be laminated on the surface of the adhesive layer of the laminate (X) or laminate (Y).
- an adhesive layer is further laminated on the resin substrate or metal substrate of the laminate (Z) (adhesive layer / resin substrate / adhesive layer / metal substrate, resin substrate / adhesive layer / metal substrate). / Adhesive layer, adhesive layer / resin substrate / adhesive layer / metal substrate / adhesive layer).
- the laminate of the present invention further satisfies the following requirements (1) to (5).
- the laminate (Z) according to the present invention needs to have a relative dielectric constant ( ⁇ c ) of 3.0 or less at a frequency of 1 MHz of the adhesive layer.
- the adhesive composition is applied to a release substrate so that the thickness after drying is 25 ⁇ m, and dried at about 130 ° C. for about 3 minutes. Next, it is cured by heat treatment at about 140 ° C. for about 4 hours, and the cured adhesive composition layer (adhesive layer) is peeled from the release film.
- the relative dielectric constant ( ⁇ c ) at a frequency of 1 MHz of the adhesive composition layer after peeling is measured.
- the relative dielectric constant ( ⁇ c ) is 3.0 or less, preferably 2.6 or less, and more preferably 2.3 or less.
- the lower limit is not particularly limited, but is practically 2.0.
- the relative dielectric constant ( ⁇ c ) in the entire region of the frequency of 1 MHz to 10 GHz is preferably 3.0 or less, more preferably 2.6 or less, and further preferably 2.3 or less.
- the relative dielectric constant ( ⁇ c ) of the adhesive layer in the laminate (Z) can be measured as follows. That is, the metal substrate of the laminate (Z) is removed cleanly with an etching solution to obtain a laminate (X) having two layers of an adhesive layer and a resin substrate.
- the etching solution is not particularly limited, and a ferric chloride aqueous solution, a cupric chloride aqueous solution, a mixed solution of sulfuric acid and hydrogen peroxide, an alkali etchant, a nickel etchant, or the like can be used.
- the resin substrate of the laminate (X) is neatly peeled (removed), and a metal layer is formed on both surfaces of the remaining adhesive layer by a method such as vapor deposition, a thin film method such as sputtering, or application of a conductive paste.
- a method of calculating the relative dielectric constant ( ⁇ c ) from the thickness and the area by measuring the capacitance by using a capacitor can be exemplified.
- a metal layer is formed on the resin substrate surface of the laminate (X) by the above-described method to form a capacitor, and the synthetic capacitance relative dielectric constant ( ⁇ c ) of the resin substrate and the adhesive layer is measured.
- the metal layer and adhesive layer are peeled off (removed) cleanly from the laminate (X), and the relative dielectric constant ( ⁇ c ) of the remaining resin substrate is converted into a capacitor in the same manner to measure the capacitance.
- the dielectric layer of the capacitor obtained from the laminate (X) can be regarded as a multilayer dielectric of a resin base material and an adhesive layer
- the relative dielectric constant ( ⁇ c ) of the adhesive layer should be calculated from the difference between the two. Can do.
- the laminate (Z) according to the present invention is required to have a dielectric loss tangent (tan ⁇ ) at a frequency of 1 MHz of the adhesive layer of 0.02 or less.
- the adhesive composition is applied to a release substrate so that the thickness after drying is 25 ⁇ m, and dried at about 130 ° C. for about 3 minutes. Next, it is cured by heat treatment at about 140 ° C. for about 4 hours, and the cured adhesive composition layer (adhesive layer) is peeled from the release film.
- the dielectric loss tangent (tan ⁇ ) at a frequency of 1 MHz of the adhesive composition after peeling is measured.
- the dielectric loss tangent (tan ⁇ ) is 0.02 or less, preferably 0.01 or less, more preferably 0.005 or less.
- the lower limit is not particularly limited, but is practically 0.0001.
- the dielectric loss tangent (tan ⁇ ) in the entire region of the frequency of 1 MHz to 10 GHz is preferably 0.02 or less, more preferably 0.01 or less, and further preferably 0.005 or less.
- the dielectric loss tangent (tan ⁇ ) of the adhesive layer in the laminate (Z) can also be measured by the same operation as the dielectric constant.
- the peel strength between the resin base material and the metal base material needs to be 0.5 N / mm or more.
- the adhesive composition is applied to a resin substrate so that the thickness after drying is about 25 ⁇ m, and dried at about 130 ° C. for about 3 minutes.
- a metal substrate is bonded to the surface of the adhesive composition layer (adhesive layer). Bonding is performed by vacuum pressing at a pressure of about 40 kgf / cm 2 at about 160 ° C. for about 30 seconds so that the glossy surface of the metal substrate is in contact with the adhesive composition layer.
- it is cured by heat treatment at about 140 ° C.
- the resin substrate of the laminate (Z) is peeled 90 ° at a tensile speed of 50 mm / min, and the peel strength is measured.
- the 90 ° peel strength needs to be 0.5 N / mm or more, preferably 0.8 N / mm or more, and more preferably 1.0 N / mm or more.
- 90 degree peel strength is 0.5 N / mm or more, it is included by this invention.
- the laminate (Z) of the present invention can be obtained by laminating a metal substrate on the surface of the adhesive composition layer (adhesive layer) of the laminate (X). Bonding is performed by vacuum pressing at a pressure of about 40 kgf / cm 2 at about 160 ° C. for about 30 seconds so that the glossy surface of the metal substrate is in contact with the adhesive composition layer. Next, it is cured by heat treatment at about 140 ° C. for about 4 hours to produce a three-layer laminate (Z) of resin substrate / adhesive layer / metal substrate. At normal temperature (about 25 ° C.), the resin substrate of the laminate (Z) is peeled 90 ° at a tensile speed of 50 mm / min, and the peel strength is measured. The 90 ° peel strength needs to be 0.5 N / mm or more, preferably 0.8 N / mm or more, and more preferably 1.0 N / mm or more.
- the laminate (Z) of the present invention can be obtained by laminating a resin substrate on the surface of the adhesive composition layer (adhesive layer) of the laminate (Y). Bonding is performed by vacuum pressing for about 30 seconds under a pressure of about 40 kgf / cm 2 at about 160 ° C. so that the resin base material is in contact with the adhesive composition layer. Next, it is cured by heat treatment at about 140 ° C. for about 4 hours to produce a three-layer laminate (Z) of resin substrate / adhesive layer / metal substrate. At normal temperature (about 25 ° C.), the resin substrate of the laminate (Z) is peeled 90 ° at a tensile speed of 50 mm / min, and the peel strength is measured. The 90 ° peel strength needs to be 0.5 N / mm or more, preferably 0.8 N / mm or more, and more preferably 1.0 N / mm or more.
- the laminate (Z) of the present invention can be obtained by laminating the resin base material on one surface of the adhesive layer and pasting the glossy surface of the metal base material on the other surface. Bonding is performed by laminating the release substrate / adhesive layer and the resin substrate at about 100 ° C. under a pressure of about 3 kgf / cm 2 for about 1 m / min, and then peeling the release substrate. Bonding is performed by vacuum pressing for about 30 seconds under a pressure of about 40 kgf / cm 2 at about 160 ° C. so that the glossy surface of the metal substrate is in contact with the adhesive layer. Next, it is cured by heat treatment at about 140 ° C.
- the resin substrate of the laminate (Z) is peeled 90 ° at a tensile speed of 50 mm / min, and the peel strength is measured.
- the 90 ° peel strength needs to be 0.5 N / mm or more, preferably 0.8 N / mm or more, and more preferably 1.0 N / mm or more.
- the laminate (Z) according to the present invention is required to have a humidified solder heat resistance of 240 ° C. or higher.
- the adhesive composition is applied to a resin substrate so that the thickness after drying is 25 ⁇ m, and dried at about 130 ° C. for about 3 minutes.
- a metal substrate is bonded to the surface of the adhesive composition layer (adhesive layer). Bonding is performed by vacuum pressing for about 30 seconds under a pressure of about 40 kgf / cm 2 at about 160 ° C. so that the glossy surface of the metal substrate is in contact with the adhesive composition layer.
- it is cured by heat treatment at about 140 ° C.
- the laminate (Z) is treated for about 72 hours under conditions of about 40 ° C. and about 80 RH%, and then flows in a solder bath melted at each temperature for 1 minute, and the temperature at which no change in appearance such as blistering occurs is measured. .
- the humidified solder heat resistance needs to be 240 ° C. or higher, preferably 250 ° C. or higher, more preferably 260 ° C. or higher.
- humidification solder heat resistance is 240 degreeC or more, it is included by this invention.
- the laminate (Z) of the present invention can be obtained by laminating a metal substrate on the surface of the adhesive composition layer (adhesive layer) of the laminate (X). Bonding is performed by vacuum pressing at a pressure of about 40 kgf / cm 2 at about 160 ° C. for about 30 seconds so that the glossy surface of the metal substrate is in contact with the adhesive composition layer. Next, it is cured by heat treatment at about 140 ° C. for about 4 hours to produce a three-layer laminate (Z) of resin substrate / adhesive layer / metal substrate. The laminate (Z) is treated for about 72 hours under conditions of about 40 ° C.
- the humidified solder heat resistance needs to be 240 ° C. or higher, preferably 250 ° C. or higher, more preferably 260 ° C. or higher.
- the laminate (Z) of the present invention can be obtained by laminating a resin substrate on the surface of the adhesive composition layer (adhesive layer) of the laminate (Y). Bonding is performed by vacuum pressing for about 30 seconds under a pressure of about 40 kgf / cm 2 at about 160 ° C. so that the resin base material is in contact with the adhesive composition layer. Next, it is cured by heat treatment at about 140 ° C. for about 4 hours to produce a three-layer laminate (Z) of resin substrate / adhesive layer / metal substrate. The laminate (Z) is treated for about 72 hours under conditions of about 40 ° C.
- the humidified solder heat resistance needs to be 240 ° C. or higher, preferably 250 ° C. or higher, more preferably 260 ° C. or higher.
- the laminate (Z) of the present invention can be obtained by bonding the resin base material to one surface of the adhesive layer and bonding the glossy surface of the metal base material to the other surface. it can. Bonding is performed by bonding the adhesive layer and the resin base material, and then applying a vacuum for about 30 seconds at about 160 ° C. under a pressure of about 40 kgf / cm 2 so that the glossy surface of the metal base material is in contact with the adhesive layer. Press and bond. Next, it is cured by heat treatment at about 140 ° C. for about 4 hours to produce a three-layer laminate (Z) of resin substrate / adhesive layer / metal substrate. The laminate (Z) is treated for about 72 hours under conditions of about 40 ° C.
- the humidified solder heat resistance needs to be 240 ° C. or higher, preferably 250 ° C. or higher, more preferably 260 ° C. or higher.
- the laminate (Z) according to the present invention needs to be VTM-0 when the laminate (X) constituting the laminate (Z) is evaluated by a flame retardancy evaluation test based on UL-94. .
- the adhesive composition of the present invention is applied to a resin substrate so that the thickness after drying is 25 ⁇ m, and dried at about 130 ° C. for about 3 minutes.
- a test piece 50 ⁇ 0.5 mm ⁇ 200 ⁇ 0.5 mm
- the thickness is measured.
- the test piece is rolled into a cylinder having a length of 200 mm and a diameter of about 10 mm and fixed to a stand.
- the flame of the gas burner is adjusted to a height of about 20 mm, and the combustion time is measured after 3 seconds of flame contact with the lower end of the test piece. Repeat flame contact twice per sample. Each combustion time is 10 sec or less, and a case where the total combustion time of two times is 30 sec or less is judged to be acceptable.
- Each N 5 is tested, and all passed are equivalent to VTM-0.
- the metal substrate of the laminate (Z) can be removed with an etchant to obtain a two-layer laminate (X) of an adhesive layer and a resin substrate.
- the etching solution is not particularly limited, and a ferric chloride aqueous solution, a cupric chloride aqueous solution, a mixed solution of sulfuric acid and hydrogen peroxide, an alkali etchant, a nickel etchant, or the like can be used.
- a resin substrate is bonded to the surface of the adhesive composition layer (adhesive layer) of the laminate (Y) to obtain a laminate (Z), and then the laminate (Z).
- the laminate (X) can be obtained by cleanly removing the metal base material with an etching solution.
- the adhesive composition used in the present invention contains at least a carboxyl group-containing polyolefin resin (A).
- the laminate through the adhesive layer made of the adhesive composition can exhibit the excellent performances (1) to (5).
- the adhesive composition of the present invention includes a carboxyl group-containing styrene resin (B) (hereinafter also simply referred to as component (B)), a carbodiimide resin (C) (hereinafter simply referred to as (C). ), Epoxy resin (D) (hereinafter also simply referred to as (D) component) and / or flame retardant filler (E) (hereinafter also simply referred to as (E) component).
- a low-polarity resin base material such as an LCP film that is not assumed in the prior art, as well as conventional polyimide and polyester films.
- it has high adhesion to a metal substrate and is excellent in solder heat resistance, electrical properties (low dielectric properties) and flame retardancy.
- the carboxyl group-containing styrene resin (B) that can be used in the present invention is not limited.
- the aromatic vinyl compound is not particularly limited.
- styrene for example, styrene, t-butylstyrene, ⁇ -methylstyrene, p-methylstyrene, divinylbenzene, 1,1-diphenylstyrene, N, N-diethyl-p-aminoethyl
- conjugated diene compound examples include butadiene, isoprene, 1,3-pentadiene, 2,3-dimethyl-1,3-butadiene and the like.
- copolymers of these aromatic vinyl compounds and conjugated diene compounds include styrene-ethylene-butylene-styrene block copolymers (SEBS), styrene-ethylene-propylene-styrene block copolymers (SEPS), Examples thereof include styrene-ethylene-ethylene / propylene-styrene block copolymer (SEEPS).
- SEBS styrene-ethylene-butylene-styrene block copolymers
- SEPS styrene-ethylene-propylene-styrene block copolymers
- SEEPS styrene-ethylene-ethylene / propylene-styrene block copolymer
- the modification of the carboxyl group-containing styrene resin (B) can be performed, for example, by copolymerizing an unsaturated carboxylic acid during the polymerization of the styrene resin. Moreover, it can also carry out by heating and kneading
- the unsaturated carboxylic acid is not particularly limited, and examples thereof include acrylic acid, methacrylic acid, maleic acid, itaconic acid, fumaric acid, maleic anhydride, itaconic anhydride, and fumaric anhydride.
- the lower limit of the acid value of the carboxyl group-containing styrene resin (B) is preferably 10 equivalents / 10 6 g or more, more preferably 100 from the viewpoints of heat resistance and adhesion to a resin substrate or a metal substrate. Equivalent / 10 6 g or more, more preferably 150 equivalent / 10 6 g. If it is less than the above value, the compatibility with the epoxy resin (D) and the carbodiimide resin (C) is low, and the adhesive strength may not be exhibited. In some cases, the crosslinking density is low and the heat resistance is poor.
- the upper limit is preferably 1000 equivalents / 10 6 g or less, more preferably 700 equivalents / 10 6 g or less, and even more preferably 500 equivalents / 10 6 g or less. When the above value is exceeded, adhesiveness and low dielectric properties may be deteriorated.
- the content of the carboxyl group-containing styrene resin (B) is from 95 to 95 parts by mass of the carboxyl group-containing polyolefin resin (A) and from 95 to 95 parts by weight of the carboxyl group-containing styrene resin (B).
- the amount of component (A) When the amount of component (A) is less than the above value, the crosslinking density may decrease, and the humidified solder heat resistance may decrease. When the amount of the component (A) exceeds the above value, the wettability to the substrate is lowered, and the adhesive strength may be lowered.
- the carbodiimide resin (C) is not particularly limited as long as it has a carbodiimide group in the molecule. Preferably, it is polycarbodiimide having two or more carbodiimide groups in the molecule.
- the carboxyl group of the carboxyl group-containing polyolefin resin (A) or the carboxyl group-containing styrene resin (B) reacts with the carbodiimide, and the interaction between the adhesive composition and the substrate is caused. Can be improved and adhesion can be improved.
- the content of the carbodiimide resin (C) is 0.1 to about 100 parts by mass in total of the carboxyl group-containing polyolefin resin (A) and the carboxyl group-containing styrene resin (B).
- the range is preferably 30 parts by mass. More preferably, it is in the range of 1 to 25 parts by mass, and most preferably in the range of 2 to 20 parts by mass. If it is less than the above value, there is a problem that the interaction with the substrate does not appear and the adhesiveness is lowered. When the above value is exceeded, there is a problem that the pot life of the adhesive is lowered or the low dielectric properties are lowered.
- Epoxy resin (D) Although it will not specifically limit as an epoxy resin (D) if it has a glycidyl group in a molecule
- biphenyl type epoxy resin naphthalene type epoxy resin, bisphenol A type epoxy resin, bisphenol F type epoxy resin, novolac type epoxy resin, alicyclic epoxy resin, dicyclopentadiene type epoxy resin, At least one selected from the group consisting of tetraglycidyldiaminodiphenylmethane, triglycidylparaaminophenol, tetraglycidylbisaminomethylcyclohexanone, N, N, N ′, N′-tetraglycidyl-m-xylenediamine can be used.
- Bisphenol A type epoxy resin, novolak type epoxy resin or dicyclopentadiene type epoxy resin is preferable.
- the content of the epoxy resin (D) is 1 to 30 masses with respect to 100 mass parts in total of the carboxyl group-containing polyolefin resin (A) and the carboxyl group-containing styrene resin (B).
- the range is preferably 2 to 15 parts by mass, and most preferably 3 to 10 parts by mass. If it is less than the said range, sufficient hardening effect cannot be acquired but adhesiveness and heat resistance may fall. Moreover, when the said range is exceeded, there exists a problem that the pot life of an adhesive agent falls or a low dielectric property falls.
- the inorganic flame retardant filler examples include metal hydroxide compounds such as aluminum hydroxide, magnesium hydroxide, zirconium hydroxide, calcium hydroxide, and barium hydroxide; basic magnesium carbonate, zinc carbonate, magnesium carbonate-calcium, Metal carbonate compounds such as calcium carbonate and barium carbonate; Magnesium oxide, molybdenum oxide, zirconium oxide, tin oxide, tin oxide hydrate, metal oxides such as antimony oxide; zinc borate, zinc metaborate, barium metaborate, etc. Boric acid metal compounds; inorganic metal compounds such as dolomite, hydrotalcite, and borax; and inorganic phosphorus compounds such as red phosphorus.
- metal hydroxide compounds such as aluminum hydroxide, magnesium hydroxide, zirconium hydroxide, calcium hydroxide, and barium hydroxide
- basic magnesium carbonate, zinc carbonate, magnesium carbonate-calcium Metal carbonate compounds such as calcium carbonate and barium carbonate
- organic flame retardant fillers include melamine phosphate, melamine polyphosphate, guanidine phosphate, guanidine polyphosphate, ammonium phosphate, ammonium polyphosphate, ammonium amidophosphate, ammonium amidophosphate, carbamate phosphate, polyphosphorus Acid carbamate, aluminum trisdiethylphosphinate, aluminum trismethylethylphosphinate, aluminum trisdiphenylphosphinate, zinc bisdiethylphosphinate, zinc bismethylethylphosphinate, zinc bisdiphenylphosphinate, titanyl bisdiethylphosphinate, tetrakisdiethylphosphine Titanium titanate, titanyl bismethylethylphosphinate, titanium tetrakismethylethylphosphinate, titanyl bisdiphenylphosphinate Phosphorus flame retardants such as titanium tetrakisdiphenylphosphinate;
- a metal hydroxide compound and a phosphorus compound are preferable, and among them, a phosphorus compound is more preferable.
- a known phosphorus flame retardant filler such as aluminum phosphinate can be used.
- phosphorus-based flame retardants those that do not dissolve in organic solvents (phosphorus-based flame retardant fillers) and those that dissolve in organic solvents (phosphorus-based flame retardant non-fillers).
- a type that does not (phosphorous flame retardant filler) is preferred.
- the said flame-retardant filler may be used independently and may use 2 or more types together.
- the content of the flame retardant filler is preferably 20 to 100 parts by mass with respect to 100 parts by mass in total of the components (A) to (D).
- the range of -90 parts by mass is more preferable, and the range of 40-90 parts by mass is more preferable. If it is less than the above range, flame retardancy may be difficult to obtain. If the above range is exceeded, the adhesiveness, heat resistance, electrical properties, etc. may deteriorate.
- the adhesive composition used in the present invention can further contain an organic solvent.
- the organic solvent used in the present invention is not particularly limited as long as it dissolves the carboxyl group-containing polyolefin resin (A), the carboxyl group-containing styrene resin (B), the carbodiimide resin (C), and the epoxy resin (D).
- aromatic hydrocarbons such as benzene, toluene and xylene
- aliphatic hydrocarbons such as hexane, heptane, octane and decane
- alicyclic carbons such as cyclohexane, cyclohexene, methylcyclohexane and ethylcyclohexane
- Halogenated hydrocarbons such as hydrogen, trichloroethylene, dichloroethylene, chlorobenzene, chloroform, alcohol solvents such as methanol, ethanol, isopropyl alcohol, butanol, pentanol, hexanol, propanediol, phenol, acetone, methyl isobutyl ketone, Ketone solvents such as methyl ethyl ketone, pentanone, hexanone, cyclohexanone, isophorone, acetophenone, cellsolves such as methyl cellosolv
- the organic solvent is preferably in the range of 100 to 1000 parts by mass, and in the range of 200 to 900 parts by mass with respect to 100 parts by mass in total of the carboxyl group-containing polyolefin resin (A) and the carboxyl group-containing styrene resin (B). More preferably, the range is 300 to 800 parts by mass. If it is less than the said range, liquid state and pot life property may fall. Moreover, when the said range is exceeded, there exists a problem which becomes disadvantageous from the surface of manufacturing cost and transport cost.
- the adhesive composition used in the present invention may further contain other components as necessary.
- specific examples of such components include tackifiers, fillers different from component (E), and silane coupling agents.
- ⁇ Tackifier> You may mix
- tackifiers include polyterpene resins, rosin resins, aliphatic petroleum resins, alicyclic petroleum resins, copolymer petroleum resins, styrene resins, and hydrogenated petroleum resins, which improve adhesive strength. Used for purposes. These may be used alone or in any combination of two or more.
- the adhesive composition used in the present invention may contain a filler such as silica that is different from the component (E). It is very preferable to add silica because heat resistance is improved.
- a filler such as silica that is different from the component (E).
- Hydrophobic silica and hydrophilic silica are generally known as silica, but here, hydrophobic silica treated with dimethyldichlorosilane, hexamethyldisilazane, octylsilane, etc. in order to impart moisture absorption resistance. Is good.
- the compounding amount of silica is preferably 0.05 to 30 parts by mass with respect to 100 parts by mass in total of the components (A) to (D).
- ⁇ Silane coupling agent> You may mix
- glycidyl such as ⁇ -glycidoxypropyltrimethoxysilane, ⁇ - (3,4-epoxycyclohexyl) ethyltrimethoxysilane, and ⁇ - (3,4-epoxycyclohexyl) ethyltriethoxysilane from the viewpoint of heat resistance.
- a silane coupling agent having a group is more preferable.
- the compounding amount of the silane coupling agent is preferably 0.5 to 20 parts by mass with respect to 100 parts by mass in total of the components (A) to (D). If it is less than 0.5 parts by mass, heat resistance may be deteriorated. On the other hand, when it exceeds 20 parts by mass, heat resistance failure and adhesiveness may decrease.
- the adhesive sheet is obtained by laminating the laminate (Z) and the release substrate via an adhesive composition, or the adhesive layer surface of the laminate (X) or laminate (Y).
- a release substrate is laminated, or a release substrate is laminated on at least one surface of the adhesive layer.
- Specific configuration modes include a release substrate / adhesive layer, a release substrate / adhesive layer / release substrate, a resin substrate / adhesive layer / release substrate, a metal substrate / adhesive.
- the adhesive composition of the present invention can be obtained by applying and drying the adhesive composition used in the present invention on various laminates according to a conventional method.
- a release substrate is pasted to the adhesive layer after drying, it can be rolled up without causing any back-off to the substrate, and it is excellent in operability and the adhesive layer is protected so that it can be stored. Excellent and easy to use.
- the adhesive layer itself can be transferred to another substrate.
- the release substrate is not particularly limited.
- a coating layer of a sealant such as clay, polyethylene, or polypropylene is formed on both surfaces of paper such as fine paper, kraft paper, roll paper, and glassine paper.
- a silicone-type, fluorine-type, or alkyd-type release agent is further applied on each coating layer.
- various olefin films such as polyethylene, polypropylene, ethylene- ⁇ -olefin copolymer, propylene- ⁇ -olefin copolymer, and those obtained by applying the release agent on a film such as polyethylene terephthalate are also included.
- polypropylene seal treatment is applied to both sides of the fine paper and an alkyd release agent is used on it. Or what uses an alkyd type mold release agent on polyethylene terephthalate is preferred.
- the “printed wiring board” in the present invention includes a laminate formed from a metal foil forming a conductor circuit and a resin base material as a constituent element.
- a printed wiring board is manufactured by conventionally well-known methods, such as a subtractive method, using a metal-clad laminated body, for example. If necessary, a so-called flexible circuit board (FPC), flat cable, tape automated bonding (covered by using a cover film or screen printing ink, etc., partially or entirely covered with a conductor circuit formed of metal foil (tape automated bonding) TAB) circuit board and the like.
- FPC flexible circuit board
- TAB tape automated bonding
- the printed wiring board of the present invention can have any laminated structure that can be employed as a printed wiring board.
- it can be set as the printed wiring board comprised from four layers, a base film layer, a metal foil layer, an adhesive bond layer, and a cover film layer.
- it can be set as the printed wiring board comprised from five layers, a base film layer, an adhesive bond layer, a metal foil layer, an adhesive bond layer, and a cover film layer.
- the adhesive composition used in the present invention can be suitably used for each adhesive layer of a printed wiring board.
- the adhesive composition used in the present invention is used as an adhesive, not only conventional polyimide, polyester film and copper foil constituting a printed wiring board but also high adhesiveness with a low-polarity resin substrate such as LCP.
- solder reflow resistance can be obtained, and the adhesive layer itself has excellent low dielectric properties. Therefore, it is suitable as an adhesive composition used for a coverlay film, a laminate, a resin-coated copper foil, and a bonding sheet.
- any resin film conventionally used as a substrate for printed wiring boards can be used as the substrate film.
- the resin for the base film include polyester resin, polyamide resin, polyimide resin, polyamideimide resin, liquid crystal polymer, polyphenylene sulfide, syndiotactic polystyrene, polyolefin resin, and fluorine resin.
- it has excellent adhesion to low-polar substrates such as liquid crystal polymers, polyphenylene sulfide, syndiotactic polystyrene, and polyolefin resins.
- any conventionally known insulating film can be used as an insulating film for a printed wiring board.
- films made from various polymers such as polyimide, polyester, polyphenylene sulfide, polyethersulfone, polyetheretherketone, aramid, polycarbonate, polyarylate, polyimide, polyamideimide, liquid crystal polymer, syndiotactic polystyrene, polyolefin resin, etc.
- it is a polyimide film or a liquid crystal polymer film.
- the printed wiring board of the present invention can be manufactured using any conventionally known process except that the material of each layer described above is used.
- a semi-finished product in which an adhesive layer is laminated on a cover film layer (hereinafter referred to as “cover film-side semi-finished product”) is manufactured.
- an adhesive layer is laminated on a semi-finished product (hereinafter referred to as “base film side two-layer semi-product”) or a base film layer in which a desired circuit pattern is formed by laminating a metal foil layer on the base film layer.
- base film side three-layer semi-product having a desired circuit pattern formed by laminating a metal foil layer thereon
- base film side two-layer semi-product The base film side three-layer semi-finished product is referred to as “base film side semi-finished product”.
- a four-layer or five-layer printed wiring board can be obtained by laminating the cover film side semi-finished product and the base film side semi-finished product thus obtained.
- the base film side semi-finished product is, for example, (A) a step of applying a resin solution as a base film to the metal foil, and initial drying of the coating film, (B) the metal foil obtained in (A) And the initial dried coating film are obtained by a production method including a step of heat treatment and drying (hereinafter referred to as “heat treatment / solvent removal step”).
- a conventionally known method can be used to form a circuit in the metal foil layer.
- An additive method may be used and a subtractive method may be used.
- the subtractive method is preferable.
- the obtained base film side semi-finished product may be used as it is for pasting with the cover film side semi-finished product. May be used.
- the cover film side semi-finished product is manufactured, for example, by applying an adhesive to the cover film. If necessary, a crosslinking reaction in the applied adhesive can be performed. In a preferred embodiment, the adhesive layer is semi-cured.
- the obtained cover film-side semi-finished product may be used as it is for pasting with the base film-side semi-finished product, or after being laminated and stored with the release film, pasting with the base film-side semi-finished product May be used for
- the base film side semi-finished product and the cover film side semi-finished product are each stored, for example, in the form of a roll, and then bonded together to produce a printed wiring board.
- Arbitrary methods can be used as a method of bonding, for example, it can bond using a press or a roll. Further, the two can be bonded together while heating by a method such as using a heating press or a heating roll device.
- the reinforcing material-side semi-finished product is preferably manufactured by applying an adhesive to the reinforcing material.
- a reinforcing plate that cannot be rolled up hard such as a metal plate such as SUS or aluminum, or a plate in which glass fibers are cured with an epoxy resin, by transferring and applying an adhesive previously applied to a release substrate. It is preferred to be manufactured.
- coated adhesive agent can be performed as needed.
- the adhesive layer is semi-cured.
- the obtained reinforcing material-side semi-finished product may be used as it is for pasting with the back side of the printed wiring board, and after being used for pasting with the base film-side semi-finished product after storing the release film. May be.
- the base film side semi-finished product, the cover film side semi-finished product, and the reinforcing material side semi-finished product are all laminated bodies for printed wiring boards in the present invention.
- Acid value (A) component carboxyl group-containing polyolefin resin
- the acid value (equivalent / 10 6 g) of the carboxyl group-containing polyolefin resin (A) in the present invention is FT-IR (manufactured by Shimadzu Corporation, FT-IR8200PC).
- Acid value (B) component carboxyl group-containing styrene resin
- the acid value (equivalent / 10 6 g) of the carboxyl group-containing styrene resin (B) in the present invention is obtained by dissolving the carboxyl group-containing styrene resin in toluene, Titration with phenolphthalein in methanol solution as an indicator. Expressed as equivalents (equivalent / 10 6 g) in 1 ton of resin.
- Weight average molecular weight (Mw) The weight average molecular weight in the present invention is GPC (Gel Permeation Chromatography (hereinafter referred to as GPC, standard material: polystyrene resin, mobile phase: tetrahydrofuran), column: Shodex KF-802 + KF-804L + KF-806L, column temperature: 30 ° C., flow rate: 1.0 ml / min, detector: RI detector).
- GPC Gel Permeation Chromatography
- peel strength (adhesiveness) An adhesive composition to be described later is applied to a polyimide film having a thickness of 12.5 ⁇ m (manufactured by Kaneka Corporation, Apical (registered trademark)) or an LCP film having a thickness of 25 ⁇ m (manufactured by Kuraray Co., Ltd., Bexter (registered trademark)). It was applied so that the thickness after drying was 25 ⁇ m, and dried at 130 ° C. for 3 minutes. The adhesive film (B stage product) thus obtained was bonded to 18 ⁇ m rolled copper foil. Bonding was performed by pressing for 30 seconds under a pressure of 40 kgf / cm 2 at 160 ° C.
- Humidity solder heat resistance A sample is prepared by the same method as described above, and a 2.0 cm ⁇ 2.0 cm sample piece is treated at 40 ° C. ⁇ 80 RH% ⁇ 72 hours, and then melted at each temperature in a solder bath for 1 minute. The temperature at which flow occurred and no change in appearance such as blistering occurred was measured.
- a lead wire having a length of 30 mm was adhered to the center of a circle made of a conductive silver paste with a conductive adhesive to obtain a parallel plate capacitor.
- the capacitance Cap and loss factor D (dielectric loss tangent) of the obtained parallel plate capacitor were measured using a PRECISION LCR meter HP-4284A under a condition of a frequency of 1 MHz at 22 ° C., and a relative permittivity ( ⁇ c ) was calculated.
- ⁇ c (Cap ⁇ d) / (S ⁇ ⁇ 0 )
- Cap Capacitance [F]
- S: measured dielectric area ⁇ ⁇ (25 ⁇ 10 ⁇ 3 ) 2 ⁇ 0 : Dielectric constant of vacuum 8.854 ⁇ 10 ⁇ 12 It is.
- the relative dielectric constant and dielectric loss tangent obtained were evaluated as follows.
- the liquid containing the resin was centrifuged to separate and purify an acid-modified propylene-butene copolymer grafted with maleic anhydride, (poly) maleic anhydride and a low molecular weight product. Thereafter, by drying at 70 ° C. under reduced pressure for 5 hours, a maleic anhydride-modified propylene-butene copolymer (CO-1, acid value 410 equivalents / 10 6 g, weight average molecular weight 60,000, Tm 80 ° C., ⁇ H35J / G).
- Production Example 2 A maleic anhydride-modified propylene-butene copolymer (CO-2, acid value 224 equivalents / 10 6 g, weight was obtained in the same manner as in Production Example 1 except that the amount of maleic anhydride charged was changed to 11 parts by mass. Average molecular weight 65,000, Tm 78 ° C., ⁇ H 25 J / g).
- Example 1 In a 500 ml four-necked flask equipped with a water-cooled reflux condenser and a stirrer, 80 parts by mass of the maleic anhydride-modified propylene-butene copolymer (CO-1) obtained in Production Example 1 and a carboxyl group-containing styrene resin 20 parts by mass of (Tuftec (registered trademark) M1943), 450 parts by mass of methylcyclohexane, and 50 parts by mass of methyl ethyl ketone were charged, heated to 80 ° C. while stirring, and dissolved by continuing stirring for 1 hour.
- CO-1 maleic anhydride-modified propylene-butene copolymer
- carboxyl group-containing styrene resin 20 parts by mass of (Tuftec (registered trademark) M1943), 450 parts by mass of methylcyclohexane, and 50 parts by mass of methyl ethyl ketone
- the cooled solution was mixed with 5 parts by weight of carbodiimide resin V-09GB and 10 parts by weight of epoxy resin HP-7200 to obtain a mixed solution.
- 60 parts by mass of the flame retardant filler OP-935 was blended with the obtained mixed solution to obtain an adhesive composition.
- Table 1 shows the blending amount, adhesive strength, solder heat resistance, electrical characteristics, and flame retardancy.
- Examples 2 to 10 The carboxyl group-containing polyolefin resin, the carboxyl group-containing styrene resin, the carbodiimide resin, the epoxy resin, and the flame retardant filler are changed to those shown in Table 1, and the amounts shown in Table 1 are obtained in the same manner as in Example 1. Examples 2 to 10 were carried out with the above changes. Table 1 shows the adhesive strength, solder heat resistance, electrical characteristics, and flame retardancy.
- Comparative Examples 1 to 4 The carboxyl group-containing polyolefin resin, the carboxyl group-containing styrene resin, the carbodiimide resin, the epoxy resin, and the flame retardant filler are changed to those shown in Table 2, and the amounts shown in Table 2 are obtained in the same manner as in Example 1. Thus, Comparative Examples 1 to 4 were performed. Table 2 shows the adhesive strength, solder heat resistance, electrical characteristics, and flame retardancy.
- the carboxyl group-containing polyolefin resin (A), carboxyl group-containing styrene resin (B), carbodiimide resin (C), epoxy resin (D), and flame-retardant filler (E) used in Tables 1 and 2 are as follows. .
- Carboxyl group-containing styrene resin Tuftec (registered trademark) M1913 (manufactured by Asahi Kasei Chemicals Corporation), acid value of 185 equivalents / 10 6 g
- Carboxyl group-containing styrene resin Tuftec (registered trademark) M1943 (manufactured by Asahi Kasei Chemicals Corporation), acid value of 185 equivalents / 10 6 g
- Carbodiimide resin V-09GB (Nisshinbo Chemical Co., Ltd.)
- Dicyclopentadiene type epoxy resin HP-7200 (manufactured by DIC)
- Phosphorus-based flame retardant filler EXOLIT (registered trademark) OP-935 (Clariant)
- Metal hydrate flame retardant filler MGZ-3 (manufactured by Sakai Chemical Industry Co., Ltd.)
- Intomesent flame retardant filler FP-2100JC (made by ADEKA
- Comparative Example 3 an organophosphorus flame retardant is blended and is too compatible with the adhesive, resulting in poor adhesion and humidified solder heat resistance.
- Comparative Example 4 since only the carboxyl-containing styrene resin is used, the crosslinking density is low, and the humidified solder heat resistance is poor.
- a resin base material having a low dielectric property such as LCP and a metal base material such as copper foil has high adhesiveness and high solder heat resistance. It is possible to provide a laminate that can be obtained and has excellent low dielectric properties and flame retardancy. Due to the above characteristics, it is useful in flexible printed wiring board applications, particularly FPC applications that require low dielectric properties (low relative dielectric constant, low dielectric loss tangent) in a high frequency region.
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Abstract
Description
しかしながら、低誘電特性を有する基材フィルムは、低極性のため、従来のエポキシ系接着剤やアクリル系接着剤を用いた場合、接着力が弱く、カバーレイフィルム、積層板等FPC用部材の作製が困難であった(例えば、特許文献1、2)。また、エポキシ系接着剤やアクリル系接着剤は、低誘電特性に優れず、FPCの誘電特性を損なう。
さらに上記の目的で使用する接着剤組成物は可燃性であることが多く、難燃性を付与する必要がある。難燃剤はハロゲン系有機化合物を使用した系が優れた難燃性を有する。しかし、この方法は燃焼時に腐食性のハロゲンガスを発する問題がある。そのため、ハロゲン成分を含まないハロゲンフリーな難燃剤が求められている。例えばリン系難燃剤の配合が採用されている。たとえば、特許文献3には、難燃剤として、有機ホスフィン酸アルミニウムを使用できるとされており、同文献に記載のカバーレイフィルムに難燃剤を含有させる場合の、難燃剤の含有量の範囲が示されている。
(1)接着剤層の周波数1MHzにおける比誘電率(εc)が3.0以下であり、
(2)接着剤層の周波数1MHzにおける誘電正接(tanδ)が0.02以下であり、
(3)樹脂基材と金属基材との剥離強度が0.5N/mm以上であり、
(4)積層体(Z)の加湿ハンダ耐熱性が240℃以上であり、
(5)積層体(Z)から金属基材を除去した、積層体(X)がUL-94法においてVTM-0である
ことを特徴とする積層体(Z)。
(1)接着剤層の周波数1MHzにおける比誘電率(εc)が3.0以下であり、
(2)接着剤層の周波数1MHzにおける誘電正接(tanδ)が0.02以下であり、
(3)積層体(X)の接着剤層面に金属基材を積層した場合の該積層体における樹脂基材と金属基材との剥離強度が0.5N/mm以上であり、
(4)積層体(X)の接着剤層面に金属基材を積層した場合の該積層体の加湿ハンダ耐熱性が240℃以上であり、
(5)積層体(X)がUL-94法においてVTM-0である
ことを特徴とする積層体(X)。
(1)接着剤層の周波数1MHzにおける比誘電率(εc)が3.0以下であり、
(2)接着剤層の周波数1MHzにおける誘電正接(tanδ)が0.02以下であり、
(3)積層体(Y)の接着剤層面に樹脂基材を積層した場合の該積層体における樹脂基材と金属基材との剥離強度が0.5N/mm以上であり、
(4)積層体(Y)の接着剤層面に樹脂基材を積層した場合の該積層体の加湿ハンダ耐熱性が240℃以上であり、
(5)積層体(Y)の接着剤層面に樹脂基材を積層して積層体(Z)を作製し、次いで金属基材を除去した後の積層体(X)がUL-94法においてVTM-0である
ことを特徴とする積層体(Y)。
(1)接着剤層の周波数1MHzにおける比誘電率(εc)が3.0以下であり、
(2)接着剤層の周波数1MHzにおける誘電正接(tanδ)が0.02以下であり、
(3)接着剤層の一方の面に樹脂基材を積層し、他方の面に金属基材を積層した場合の該積層体における樹脂基材と金属基材との剥離強度が0.5N/mm以上であり、
(4)接着剤層の一方の面に樹脂基材を積層し、他方の面に金属基材を積層した場合の該積層体の加湿ハンダ耐熱性が240℃以上であり、
(5)接着剤層の一方の面に樹脂基材を積層した積層体(X)がUL-94法においてVTM-0である
ことを特徴とする接着剤層。
本発明に用いるカルボキシル基含有ポリオレフィン樹脂(A)(以下、単に(A)成分ともいう)は限定的ではないが、ポリオレフィン樹脂にα,β-不飽和カルボン酸及びその酸無水物の少なくとも1種をグラフトすることにより得られるものであることが好ましい。ポリオレフィン樹脂とは、エチレン、プロピレン、ブテン、ブタジエン、イソプレン等に例示されるオレフィンモノマーの単独重合、もしくはその他のモノマーとの共重合、および得られた重合体の水素化物やハロゲン化物など、炭化水素骨格を主体とする重合体を指す。すわなち、カルボキシル基含有ポリオレフィンは、ポリエチレン、ポリプロピレン及びプロピレン-α-オレフィン共重合体の少なくとも1種に、α,β-不飽和カルボン酸及びその酸無水物の少なくとも1種をグラフトすることにより得られるものが好ましい。
本発明において、接着剤層とは、接着剤組成物を基材に塗布し、乾燥させた後の接着剤組成物の層をいう。接着剤層の厚みは特に限定されないが、好ましくは5μm以上であり、より好ましくは、10μm以上であり、さらに好ましくは15μm以上である。また、好ましくは200μm以下であり、より好ましくは100μm以下であり、さらに好ましくは50μm以下ある。厚さが薄すぎる場合には、接着性能が十分に得られないことがあり、厚すぎる場合には、乾燥が不十分で残留溶剤が多くなりやすくなり、プリント配線板製造のプレス時にフクレを生じるという問題点が挙げられる。
本発明において樹脂基材とは、本発明の接着剤組成物を塗布、乾燥し、接着剤層を形成できるものであれば特に限定されるものではないが、フィルム状樹脂等の樹脂基材(以下、基材フィルム層ともいう)が好ましい。具体的には、ポリエステル樹脂、ポリアミド樹脂、ポリイミド樹脂、ポリアミドイミド樹脂、液晶ポリマー(LCP)、ポリフェニレンスルフィド、シンジオタクチックポリスチレン、ポリオレフィン系樹脂、及びフッ素系樹脂等を例示することができる。LCPフィルムの市販品としては、例えば、株式会社クラレ製のベクスター(登録商標)が挙げられる。また、ポリイミドフィルムの市販品としては、例えば、株式会社カネカ製のアピカル(登録商標)が挙げられる。
金属基材としては、回路基板に使用可能な任意の従来公知の導電性材料が使用可能である。素材としては、SUS、銅、アルミニウム、鉄、スチール、亜鉛、ニッケル等の各種金属、及びそれぞれの合金、めっき品、亜鉛やクロム化合物など他の金属で処理した金属等を例示することができる。好ましくは金属箔であり、より好ましくは銅箔である。金属箔の厚みについては特に限定はないが、好ましくは1μm以上であり、より好ましくは、3μm以上であり、さらに好ましくは10μm以上である。また、好ましくは50μm以下であり、より好ましくは30μm以下であり、さらに好ましくは20μm以下ある。厚さが薄すぎる場合には、回路の充分な電気的性能が得られにくい場合があり、一方、厚さが厚すぎる場合には回路作製時の加工能率等が低下する場合がある。金属箔は、通常、ロール状の形態で提供されている。本発明のプリント配線板を製造する際に使用される金属箔の形態は特に限定されない。リボン状の形態の金属箔を用いる場合、その長さは特に限定されない。また、その幅も特に限定されないが、250~500cm程度であるのが好ましい。
本発明の積層体(Z)は、樹脂基材と金属基材が接着剤層を介して積層したもの(樹脂基材/接着剤層/金属基材の3層積層体)であり、積層体(X)は樹脂基材と接着剤層が積層したもの(樹脂基材/接着剤層)であり、積層体(Y)は金属基材と接着剤層が積層したもの(金属基材/接着剤層)である。本発明では、積層体(X)、積層体(Y)および積層体(Z)をあわせて単に積層体ということがある。積層体(X)は、接着剤組成物を、常法に従い、樹脂基材に塗布、乾燥することで得られる。また、積層体(Y)は、接着剤組成物を、常法に従い、金属基材に塗布、乾燥することで得られる。積層体(Z)は、積層体(X)または積層体(Y)に、それぞれ金属基材または樹脂基材を積層することにより得ることができる。積層体(X)または積層体(Y)の接着剤層の面に離型基材を積層することもできる。また、積層体(Z)の樹脂基材または金属基材にさらに接着剤層を積層(接着剤層/樹脂基材/接着剤層/金属基材、樹脂基材/接着剤層/金属基材/接着剤層、接着剤層/樹脂基材/接着剤層/金属基材/接着剤層)しても差し支えない。
要件(1)について説明する。本願発明に係る積層体(Z)は、接着剤層の周波数1MHzにおける比誘電率(εc)が3.0以下であることが必要である。具体的には、接着剤組成物を離型基材に乾燥後の厚みが25μmとなるよう塗布し、約130℃で約3分間乾燥する。次いで約140℃で約4時間熱処理して硬化させて、硬化後の接着剤組成物層(接着剤層)を離型フィルムから剥離する。剥離後の該接着剤組成物層の周波数1MHzにおける比誘電率(εc)を測定する。比誘電率(εc)は3.0以下であり、好ましくは2.6以下であり、より好ましくは2.3以下である。下限は特に限定されないが、実用上は2.0である。また、周波数1MHz~10GHzの全領域における比誘電率(εc)が3.0以下であることが好ましく、2.6以下であることがより好ましく、2.3以下であることがさらに好ましい。
要件(2)について説明する。本願発明に係る積層体(Z)は、接着剤層の周波数1MHzにおける誘電正接(tanδ)が0.02以下であることが必要である。具体的には、接着剤組成物を離型基材に乾燥後の厚みが25μmとなるよう塗布し、約130℃で約3分間乾燥する。次いで約140℃で約4時間熱処理して硬化させて、硬化後の接着剤組成物層(接着剤層)を離型フィルムから剥離する。剥離後の該接着剤組成物の周波数1MHzにおける誘電正接(tanδ)を測定する。誘電正接(tanδ)は0.02以下であり、好ましくは0.01以下であり、より好ましくは0.005以下である。下限は特に限定されないが、実用上は0.0001である。また、周波数1MHz~10GHzの全領域における誘電正接(tanδ)が0.02以下であることが好ましく、0.01以下であることがより好ましく、0.005以下であることがさらに好ましい。
要件(3)について説明する。本願発明に係る積層体(Z)は、樹脂基材と金属基材の剥離強度が0.5N/mm以上であることが必要である。具体的には、接着剤組成物を樹脂基材に乾燥後の厚みが約25μmとなるように塗布し、約130℃で約3分間乾燥する。次いで接着剤組成物層(接着剤層)の面に、金属基材を貼り合せる。貼り合せは、金属基材の光沢面が接着剤組成物層と接するようにして、約160℃で約40kgf/cm2の加圧下で約30秒間真空プレスして接着する。次いで約140℃で約4時間熱処理して硬化させて、樹脂基材/接着剤層/金属基材の3層積層体(Z)を作製する。常温(約25℃)にて、該積層体(Z)の樹脂基材を引張速度50mm/minで90°剥離し、剥離強度を測定する。90°剥離強度は0.5N/mm以上であることが必要であり、好ましくは0.8N/mm以上であり、より好ましくは1.0N/mm以上である。なお、前記方法以外の方法で作製された積層体(Z)であっても、90°剥離強度が0.5N/mm以上であれば、本発明に包含される。
要件(4)について説明する。本願発明に係る積層体(Z)は、加湿ハンダ耐熱性が240℃以上であることが必要である。具体的には、接着剤組成物を樹脂基材に、乾燥後の厚みが25μmとなるように塗布し、約130℃で約3分間乾燥する。次いで接着剤組成物層(接着剤層)の面に、金属基材を貼り合せる。貼り合せは、金属基材の光沢面が接着剤組成物層と接するようにして、約160℃で約40kgf/cm2の加圧下に約30秒間真空プレスして接着する。次いで約140℃で約4時間熱処理して硬化させて、樹脂基材/接着剤層/金属基材の3層積層体(Z)を作製する。該積層体(Z)を約40℃、約80RH%の条件下で約72時間処理を行い、各温度で溶融したハンダ浴に1分間フローし、膨れなどの外観変化を起こさない温度を測定する。加湿ハンダ耐熱性は240℃以上であることが必要であり、好ましくは250℃以上であり、より好ましくは260℃以上である。なお、前記方法以外の方法で作製された積層体(Z)であっても、加湿ハンダ耐熱性が240℃以上であれば、本発明に包含される。
要件(5)について説明する。本願発明に係る積層体(Z)は、積層体(Z)を構成する積層体(X)をUL-94に基づく難燃性評価試験で評価した際、VTM-0であることが必要である。具体的には、本発明の接着剤組成物を樹脂基材に乾燥後の厚みが25μmとなるよう塗布し、約130℃で約3分間乾燥する。次いで約140℃で約4時間熱処理して硬化させて得た積層体(X)から試験片(50±0.5mm×200±0.5mm)を切り出し、厚みを測定する。試験片を長さ200mm、直径約10mmの筒状に丸めてスタンドに固定する。ガスバーナーの炎を高さ約20mmに調整し、試験片の下端に3sec接炎後、燃焼時間を測定する。1サンプルにつき2回接炎を繰返す。各燃焼時間が10sec以下であり、2回の合計燃焼時間が30sec以下のものを合格と判断する。各N=5で試験を行い、すべて合格したものをVTM-0相当する。
本発明に用いる接着剤組成物は、少なくともカルボキシル基含有ポリオレフィン樹脂(A)を含むものである。カルボキシル基含有ポリオレフィン樹脂(A)を含有することで、該接着剤組成物からなる接着剤層を介した積層体が前記(1)~(5)の優れた性能を発現することができる。
本発明で用いることができるカルボキシル基含有スチレン樹脂(B)は限定的ではないが、芳香族ビニル化合物単独もしくは、芳香族ビニル化合物と共役ジエン化合物とのブロック及び/又はランダム構造を主体とする共重合体、並びにその水素添加物を、不飽和カルボン酸で変性したものであることが好ましい。芳香族ビニル化合物としては、特に限定されないが、例えばスチレン、t-ブチルスチレン、α-メチルスチレン、p-メチルスチレン、ジビニルベンゼン、1,1-ジフェニルスチレン、N,N-ジエチル-p-アミノエチルスチレン、ビニルトルエン、p-第3ブチルスチレン等が挙げられる。また、共役ジエン化合物としては、例えば、ブタジエン、イソプレン、1,3-ペンタジエン、2,3-ジメチル-1,3-ブタジエン等が挙げられる。これら芳香族ビニル化合物と共役ジエン化合物との共重合体の具体例としては、スチレン-エチレン-ブチレン-スチレンブロック共重合体(SEBS)、スチレン-エチレン-プロピレン-スチレンブロック共重合体(SEPS)、スチレン-エチレン-エチレン・プロピレン-スチレンブロック共重合体(SEEPS)などが挙げられる。
カルボジイミド樹脂(C)としては、分子内にカルボジイミド基を有するものであれば、特に限定されない。好ましくは分子内にカルボジイミド基を2個以上有するポリカルボジイミドである。カルボジイミド樹脂(C)を使用することによって、カルボキシル基含有ポリオレフィン樹脂(A)またはカルボキシル基含有スチレン樹脂(B)のカルボキシル基とカルボジイミドとが反応し、接着剤組成物と基材との相互作用を高め、接着性を向上することができる。
エポキシ樹脂(D)としては、分子中にグリシジル基を有するものであれば、特に限定されないが、好ましくは分子中に2個以上のグリシジル基を有するものである。具体的には、特に限定されないが、ビフェニル型エポキシ樹脂、ナフタレン型エポキシ樹脂、ビスフェノールA型エポキシ樹脂、ビスフェノールF型エポキシ樹脂、ノボラック型エポキシ樹脂、脂環式エポキシ樹脂、ジシクロペンタジエン型エポキシ樹脂、テトラグリシジルジアミノジフェニルメタン、トリグリシジルパラアミノフェノール、テトラグリシジルビスアミノメチルシクロヘキサノン、N,N,N’,N’-テトラグリシジル-m-キシレンジアミンからなる群から選択される少なくとも1つを用いることができる。好ましくは、ビスフェノールA型エポキシ樹脂、ノボラック型エポキシ樹脂またはジシクロペンタジエン型エポキシ樹脂である。
難燃性フィラー(E)としては、特に限定されないが、有機溶剤に溶解しないものであることが好ましく、無機系難燃性フィラーと有機系難燃性フィラーが挙げられる。無機系難燃性フィラーとしては、例えば、水酸化アルミニウム、水酸化マグネシウム、水酸化ジルコニウム、水酸化カルシウム、水酸化バリウムなどの水酸化金属化合物;塩基性炭酸マグネシウム、炭酸亜鉛、炭酸マグネシウム-カルシウム、炭酸カルシウム、炭酸バリウムなどの炭酸金属化合物;酸化マグネシウム、酸化モリブデン、酸化ジルコニウム、酸化スズ、酸化スズの水和物、酸化アンチモンなどの金属酸化物;ホウ酸亜鉛、メタホウ酸亜鉛、メタホウ酸バリウムなどのホウ酸金属化合物;ドロマイト、ハイドロタルサイト、硼砂などの無機金属化合物;赤リンなどの無機リン化合物等が挙げられる。有機系難燃性フィラーとしては、例えば、リン酸メラミン、ポリリン酸メラミン、リン酸グアニジン、ポリリン酸グアニジン、リン酸アンモニウム、ポリリン酸アンモニウム、リン酸アミドアンモニウム、ポリリン酸アミドアンモニウム、リン酸カルバメート、ポリリン酸カルバメート、トリスジエチルホスフィン酸アルミニウム、トリスメチルエチルホスフィン酸アルミニウム、トリスジフェニルホスフィン酸アルミニウム、ビスジエチルホスフィン酸亜鉛、ビスメチルエチルホスフィン酸亜鉛、ビスジフェニルホスフィン酸亜鉛、ビスジエチルホスフィン酸チタニル、テトラキスジエチルホスフィン酸チタン、ビスメチルエチルホスフィン酸チタニル、テトラキスメチルエチルホスフィン酸チタン、ビスジフェニルホスフィン酸チタニル、テトラキスジフェニルホスフィン酸チタン等のリン系難燃剤;メラミン、メラム、メラミンシアヌレート等のトリアジン系化合物や、シアヌル酸化合物、イソシアヌル酸化合物、トリアゾール系化合物、テトラゾール化合物、ジアゾ化合物、尿素等の窒素系難燃剤;シリコーン化合物、シラン化合物等のケイ素系難燃剤等が挙げられる。難燃性フィラーとして水酸化金属化合物、リン化合物が好ましく、中でもリン化合物がより好ましく、例えばホスフィン酸アルミニウム等の公知のリン系難燃性フィラーを使用できる。なお、リン系難燃剤には、有機溶剤に溶解しないタイプ(リン系難燃性フィラー)と有機溶剤に溶解するタイプ(リン系難燃性ノンフィラー)があるが、本発明では有機溶剤に溶解しないタイプ(リン系難燃性フィラー)が好ましい。上記難燃性フィラーは、単独で用いてもよいし、2種類以上を併用してもよい。
本発明に用いる接着剤組成物には必要に応じて粘着付与剤を配合しても良い。粘着性付与剤としては、ポリテルペン樹脂、ロジン系樹脂、脂肪族系石油樹脂、脂環族系石油樹脂、共重合系石油樹脂、スチレン樹脂および水添石油樹脂等が挙げられ、接着強度を向上させる目的で用いられる。これらは単独で用いても良いし、2種以上を任意に組み合わせて使用しても良い。
本発明に用いる接着剤組成物には必要に応じてシリカなどの前記(E)成分とは異なるフィラーを配合しても良い。シリカを配合することにより耐熱性の特性が向上するため非常に好ましい。シリカとしては一般に疎水性シリカと親水性シリカが知られているが、ここでは耐吸湿性を付与する上でジメチルジクロロシランやヘキサメチルジシラザン、オクチルシラン等で処理を行った疎水性シリカの方が良い。シリカの配合量は、(A)~(D)成分の合計100質量部に対し、0.05~30質量部の配合量であることが好ましい。0.05質量部未満であると耐熱性を向上させる効果が発揮しない場合がある。一方30質量部を超えるとシリカの分散不良が生じたり溶液粘度が高くなりすぎて作業性に不具合が生じたり或いは接着性が低下する場合がある。
本発明に用いる接着剤組成物には必要に応じてシランカップリング剤を配合しても良い。シランカップリング剤を配合することにより金属への接着性や耐熱性の特性が向上するため非常に好ましい。シランカップリング剤としては特に限定されないが、不飽和基を有するもの、グリシジル基を有するもの、アミノ基を有するものなどが挙げられる。これらのうち耐熱性の観点からγ-グリシドキシプロピルトリメトキシシランやβ-(3,4-エポキシシクロヘキシル)エチルトリメトキシシランやβ-(3,4-エポキシシクロヘキシル)エチルトリエトキシシラン等のグリシジル基を有したシランカップリング剤がさらに好ましい。シランカップリング剤の配合量は(A)~(D)成分の合計100質量部に対して0.5~20質量部の配合量であることが好ましい。0.5質量部未満であると耐熱性不良となる場合がある。一方、20質量部を超えると耐熱性不良や接着性が低下する場合がある。
本発明において、接着シートとは、前記積層体(Z)と離型基材とを接着剤組成物を介して積層したもの、または積層体(X)もしくは積層体(Y)の接着剤層面に離型基材を積層したもの、または接着剤層の少なくとも一方の面に離型基材を積層したものである。具体的な構成態様としては、離型基材/接着剤層、離型基材/接着剤層/離型基材、樹脂基材/接着剤層/離型基材、金属基材/接着剤層/離型基材、積層体/接着剤層/離型基材、または離型基材/接着剤層/積層体/接着剤層/離型基材が挙げられる。離型基材を積層することで基材の保護層として機能する。また離型基材を使用することで、接着シートから離型基材を離型して、さらに別の基材に接着剤層を転写することができる。
離型基材としては、特に限定されるものではないが、例えば、上質紙、クラフト紙、ロール紙、グラシン紙などの紙の両面に、クレー、ポリエチレン、ポリプロピレンなどの目止剤の塗布層を設け、さらにその各塗布層の上にシリコーン系、フッ素系、アルキド系の離型剤が塗布されたものが挙げられる。また、ポリエチレン、ポリプロピレン、エチレン-α-オレフィン共重合体、プロピレン-α-オレフィン共重合体等の各種オレフィンフィルム単独、及びポリエチレンテレフタレート等のフィルム上に上記離型剤を塗布したものも挙げられる。離型基材と接着剤層との離型力、シリコーンが電気特性に悪影響を与える等の理由から、上質紙の両面にポリプロピレン目止処理しその上にアルキド系離型剤を用いたもの、またはポリエチレンテレフタレート上にアルキド系離型剤を用いたものが好ましい。
本発明における「プリント配線板」は、導体回路を形成する金属箔と樹脂基材とから形成された積層体を構成要素として含むものである。プリント配線板は、例えば、金属張積層体を用いてサブトラクティブ法などの従来公知の方法により製造される。必要に応じて、金属箔によって形成された導体回路を部分的、或いは全面的にカバーフィルムやスクリーン印刷インキ等を用いて被覆した、いわゆるフレキシブル回路板(FPC)、フラットケーブル、テープオートメーティッドボンディング(TAB)用の回路板などを総称している。
カバーフィルムとしては、プリント配線板用の絶縁フィルムとして従来公知の任意の絶縁フィルムが使用可能である。例えば、ポリイミド、ポリエステル、ポリフェニレンスルフィド、ポリエーテルスルホン、ポリエーテルエーテルケトン、アラミド、ポリカーボネート、ポリアリレート、ポリイミド、ポリアミドイミド、液晶ポリマー、シンジオタクチックポリスチレン、ポリオレフィン系樹脂等の各種ポリマーから製造されるフィルムが使用可能である。より好ましくは、ポリイミドフィルムまたは液晶ポリマーフィルムである。
以下、実施例を挙げて本発明を更に詳細に説明する。但し、本発明は実施例に限定されない。実施例中および比較例中に単に部とあるのは質量部を示す。
酸価(A)成分:カルボキシル基含有ポリオレフィン樹脂
本発明におけるカルボキシル基含有ポリオレフィン樹脂(A)の酸価(当量/106g)は、FT-IR(島津製作所社製、FT-IR8200PC)を使用して、無水マレイン酸のカルボニル(C=O)結合の伸縮ピーク(1780cm-1)の吸光度(I)、アイソタクチック特有のピーク(840cm)の吸光度(II)および無水マレイン酸(東京化成製)のクロロホルム溶液によって作成した検量線から得られるファクター(f)を用いて下記式により算出した値を樹脂1ton中の当量(当量/106g)として表した。
酸価=[吸光度(I)/吸光度(II)×(f)/無水マレイン酸の分子量×2×104]
無水マレイン酸の分子量:98.06
本発明におけるカルボキシル基含有スチレン樹脂(B)の酸価(当量/106g)は、カルボキシル基含有スチレン樹脂をトルエンに溶解し、ナトリウムメトキシドのメタノール溶液でフェノールフタレインを指示薬として滴定した。樹脂1ton中の当量(当量/106g)として表した。
本発明における重量平均分子量は(株)島津製作所製:GPC(ゲル・パーミエーション・クロマトグラフィー(以下、GPC、標準物質:ポリスチレン樹脂、移動相:テトラヒドロフラン、カラム:Shodex KF-802 + KF-804L + KF-806L、カラム温度:30℃、流速:1.0ml/分、検出器:RI検出器)によって測定した値である。
後述する接着剤組成物を厚さ12.5μmのポリイミドフィルム(株式会社カネカ製、アピカル(登録商標))、または、厚さ25μmのLCPフィルム(株式会社クラレ製、ベクスター(登録商標))に、乾燥後の厚みが25μmとなるように塗布し、130℃で3分乾燥した。この様にして得られた接着性フィルム(Bステージ品)を18μmの圧延銅箔と貼り合わせた。貼り合わせは、圧延銅箔の光沢面が接着剤と接する様にして、160℃で40kgf/cm2の加圧下に30秒間プレスし、接着した。次いで140℃で4時間熱処理して硬化させて、剥離強度評価用サンプルを得た。剥離強度は、25℃において、フィルム引き、引張速度50mm/minで90°剥離試験を行ない、剥離強度を測定した。この試験は常温での接着強度を示すものである。
<評価基準>
◎:1.0N/mm以上
○:0.8N/mm以上1.0N/mm未満
△:0.5N/mm以上0.8N/mm未満
×:0.5N/mm未満
上記と同じ方法でサンプルを作製し、2.0cm×2.0cmのサンプル片を120℃で30分乾燥処理を行い、各温度で溶融したハンダ浴に1分間フローし、膨れなどの外観変化を起こさない温度を測定した。
<評価基準>
◎:310℃以上
○:300℃以上310℃未満
△:290℃以上300℃未満
×:290℃未満
上記と同じ方法でサンプルを作製し、2.0cm×2.0cmのサンプル片を40℃×80RH%×72時間処理を行い、各温度で溶融したハンダ浴に1分間フローし、膨れなどの外観変化を起こさない温度を測定した。
<評価基準>
◎:260℃以上
○:250℃以上260℃未満
△:240℃以上250℃未満
×:240℃未満
後述する接着剤組成物を厚さ35μmの電解銅箔の光沢面に、乾燥硬化後の厚みが25μmとなるように塗布し、130℃で3分乾燥した。次いで140℃で4時間熱処理して硬化させて試験用の銅張積層板を得た。得られた試験用の銅張積層板の硬化した接着剤組成物面に、蒸発乾固型の導電性銀ペーストを直径50mmの円形にスクリーン印刷にて塗布し120℃30分乾燥硬化させ、さらに導電性銀ペーストによる円の中央に長さ30mmのリード線を導電性接着剤にて接着し平行平板コンデンサを得た。得られた平行平板コンデンサの静電容量Capと損失係数D(誘電正接)をPRECISION LCR meter HP-4284Aを用いて、22℃下、周波数1MHzの条件で測定を行い、字式により比誘電率(εc)を算出した。
εc=(Cap×d)/(S×ε0)
ここに Cap:静電容量[F]
d:誘電体層厚さ=25×10-6[m]
S:被測定誘電体面積=π×(25×10-3)2
ε0:真空の誘電率 8.854×10-12
である。
得られた比誘電率、誘電正接について、以下の通りに評価した。
<比誘電率の評価基準>
◎:2.3以下
○:2.3を超え2.6以下
△:2.6を超え3.0以下
×:3.0を超える
<誘電正接の評価基準>
◎:0.005以下
○:0.005を超え0.01以下
△:0.01を超え0.02以下
×:0.02を超える
後述する接着剤組成物を厚さ25μmのポリイミドフィルム(株式会社カネカ製、アピカル(登録商標))に、乾燥後の厚みが25μmとなるように塗布し、130℃で3分乾燥した。次いで140℃で4時間熱処理して硬化させて、積層体を得た。積層体を用いてUL-94に基づきサンプル片を作製し、VTM法に基づいて燃焼試験を行った。
<評価基準>
○:VTM-0条件を満たす
×:VTM-1以上であり、VTM-0条件を満たさない
製造例1
1Lオートクレーブに、プロピレン-ブテン共重合体(三井化学社製「タフマー(登録商標)XM7080」)100質量部、トルエン150質量部及び無水マレイン酸19質量部、ジ-tert-ブチルパーオキサイド6質量部を加え、140℃まで昇温した後、更に3時間撹拌した。その後、得られた反応液を冷却後、多量のメチルエチルケトンが入った容器に注ぎ、樹脂を析出させた。その後、当該樹脂を含有する液を遠心分離することにより、無水マレイン酸がグラフト重合した酸変性プロピレン-ブテン共重合体と(ポリ)無水マレイン酸および低分子量物とを分離、精製した。その後、減圧下70℃で5時間乾燥させることにより、無水マレイン酸変性プロピレン-ブテン共重合体(CO-1、酸価410当量/106g、重量平均分子量60,000、Tm80℃、△H35J/g)を得た。
無水マレイン酸の仕込み量を11質量部に変更した以外は製造例1と同様にすることにより、無水マレイン酸変性プロピレン-ブテン共重合体(CO-2、酸価224当量/106g、重量平均分子量65,000、Tm78℃、△H25J/g)を得た。
水冷還流凝縮器と撹拌機を備えた500mlの四つ口フラスコに、製造例1で得られた無水マレイン酸変性プロピレン-ブテン共重合体(CO-1)を80質量部、カルボキシル基含有スチレン樹脂(タフテック(登録商標)M1943)を20質量部、メチルシクロヘキサンを450質量部、メチルエチルケトンを50質量部仕込み、撹拌しながら80℃まで昇温し、撹拌を1時間続けることで溶解した。冷却して得られた溶液に、カルボジイミド樹脂V-09GBを5質量部、エポキシ樹脂HP-7200を10質量部配合し、混合溶液を得た。得られた混合溶液に難燃性フィラーOP-935を60質量部配合し接着剤組成物を得た。配合量、接着強度、ハンダ耐熱性、電気特性、難燃性を表1に示す。
カルボキシル基含有ポリオレフィン樹脂、カルボキシル基含有スチレン樹脂、カルボジイミド樹脂、エポキシ樹脂、難燃性フィラーを表1に示すものに変更し、実施例1と同様な方法で、表1に示す各配合量となるように変更し、実施例2~10を行った。接着強度、ハンダ耐熱性、電気特性、難燃性を表1に示す。
カルボキシル基含有ポリオレフィン樹脂、カルボキシル基含有スチレン樹脂、カルボジイミド樹脂、エポキシ樹脂、難燃性フィラーを表2に示すものに変更し、実施例1と同様な方法で、表2に示す各配合量となるように変更し、比較例1~4を行った。接着強度、ハンダ耐熱性、電気特性、難燃性を表2に示す。
カルボキシル基含有スチレン樹脂:タフテック(登録商標)M1913(旭化成ケミカルズ社製)、酸価185当量/106g
カルボキシル基含有スチレン樹脂:タフテック(登録商標)M1943(旭化成ケミカルズ社製)、酸価185当量/106g
カルボジイミド樹脂:V-09GB(日清紡ケミカル社製)
ジシクロペンタジエン型エポキシ樹脂:HP-7200(DIC社製)
リン系難燃性フィラー:EXOLIT(登録商標) OP-935(Clariant社)
金属水和物系難燃性フィラー:MGZ-3(堺化学工業社製)
イントメッセント系難燃性フィラー:FP-2100JC(ADEKA社製)
リン系難燃性ノンフィラー:PX-200(大八化学社製)
Claims (6)
- カルボキシル基含有ポリオレフィン樹脂(A)を含む接着剤層を介して樹脂基材および金属基材が積層された積層体(Z)であって、
(1)接着剤層の周波数1MHzにおける比誘電率(εc)が3.0以下であり、
(2)接着剤層の周波数1MHzにおける誘電正接(tanδ)が0.02以下であり、
(3)樹脂基材と金属基材との剥離強度が0.5N/mm以上であり、
(4)積層体(Z)の加湿ハンダ耐熱性が240℃以上であり、
(5)積層体(Z)から金属基材を除去した、積層体(X)がUL-94法においてVTM-0である
ことを特徴とする積層体(Z)。 - カルボキシル基含有ポリオレフィン樹脂(A)を含む接着剤層を介して樹脂基材および金属基材が積層された積層体(Z)に用いられる、前記接着剤層と前記樹脂基材の積層体(X)であって、
(1)接着剤層の周波数1MHzにおける比誘電率(εc)が3.0以下であり、
(2)接着剤層の周波数1MHzにおける誘電正接(tanδ)が0.02以下であり、
(3)積層体(X)の接着剤層面に金属基材を積層した場合の該積層体における樹脂基材と金属基材との剥離強度が0.5N/mm以上であり、
(4)積層体(X)の接着剤層面に金属基材を積層した場合の該積層体の加湿ハンダ耐熱性が240℃以上であり、
(5)積層体(X)がUL-94法においてVTM-0である
ことを特徴とする積層体(X)。 - カルボキシル基含有ポリオレフィン樹脂(A)を含む接着剤層を介して樹脂基材および金属基材が積層された積層体(Z)に用いられる、前記接着剤層と前記金属基材の積層体(Y)であって、
(1)接着剤層の周波数1MHzにおける比誘電率(εc)が3.0以下であり、
(2)接着剤層の周波数1MHzにおける誘電正接(tanδ)が0.02以下であり、
(3)積層体(Y)の接着剤層面に樹脂基材を積層した場合の該積層体における樹脂基材と金属基材との剥離強度が0.5N/mm以上であり、
(4)積層体(Y)の接着剤層面に樹脂基材を積層した場合の該積層体の加湿ハンダ耐熱性が240℃以上であり、
(5)積層体(Y)の接着剤層面に樹脂基材を積層して積層体(Z)を作製し、次いで金属基材を除去した後の積層体(X)がUL-94法においてVTM-0である
ことを特徴とする積層体(Y)。 - カルボキシル基含有ポリオレフィン樹脂(A)を含む接着剤層を介して樹脂基材および金属基材が積層された積層体(Z)に用いられる、前記接着剤層であって、
(1)接着剤層の周波数1MHzにおける比誘電率(εc)が3.0以下であり、
(2)接着剤層の周波数1MHzにおける誘電正接(tanδ)が0.02以下であり、
(3)接着剤層の一方の面に樹脂基材を積層し、他方の面に金属基材を積層した場合の該積層体における樹脂基材と金属基材との剥離強度が0.5N/mm以上であり、
(4)接着剤層の一方の面に樹脂基材を積層し、他方の面に金属基材を積層した場合の該積層体の加湿ハンダ耐熱性が240℃以上であり、
(5)接着剤層の一方の面に樹脂基材を積層した積層体(X)がUL-94法においてVTM-0である
ことを特徴とする接着剤層。 - 請求項1に記載の積層体(Z)、請求項2に記載の積層体(X)、請求項3に記載の積層体(Y)または請求項4に記載の接着剤層を含有する接着シート。
- 請求項5に記載の接着シートを構成要素として含むプリント配線板。
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