WO2016031342A1 - 低誘電接着剤組成物 - Google Patents
低誘電接着剤組成物 Download PDFInfo
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- WO2016031342A1 WO2016031342A1 PCT/JP2015/066736 JP2015066736W WO2016031342A1 WO 2016031342 A1 WO2016031342 A1 WO 2016031342A1 JP 2015066736 W JP2015066736 W JP 2015066736W WO 2016031342 A1 WO2016031342 A1 WO 2016031342A1
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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
- 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
- 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
- B32B15/085—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 comprising polyolefins
-
- 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
-
- 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
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin 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
- 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
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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
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
-
- 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
- C09J123/02—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 not modified by chemical after-treatment
-
- 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
- C09J123/26—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 modified by chemical after-treatment
-
- 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
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/03—Use of materials for the substrate
-
- 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 an adhesive composition exhibiting a low dielectric constant and a low dielectric loss tangent. More specifically, the present invention relates to an adhesive composition used for adhesion between a resin substrate and a resin substrate or a metal substrate. In particular, the present invention relates to an adhesive composition for a flexible printed wiring board (hereinafter abbreviated as FPC), and a coverlay film, a laminated board, a copper foil with resin, and a bonding sheet containing the same.
- FPC flexible printed wiring board
- Patent Document 1 proposes a modified polyamide adhesive composition in which an olefin skeleton is introduced in order to enhance the electrical characteristics of FPC.
- Patent Document 2 an adhesive using an aromatic olefin oligomer modifier and an epoxy resin and a flexible printed wiring board coverlay are proposed.
- the present invention has an excellent adhesive composition containing a crystalline acid-modified polyolefin and an amorphous polyolefin, and further containing at least one of a carbodiimide resin and an epoxy resin.
- a crystalline acid-modified polyolefin and an amorphous polyolefin and further containing at least one of a carbodiimide resin and an epoxy resin.
- the present invention provides an adhesive composition having good adhesion to various resin base materials such as polyimide and LCP and metal base materials, and excellent in heat resistance and low dielectric properties. With the goal.
- An adhesive composition containing the following component (A) and component (B), and further containing at least one of component (C) and component (D).
- the component (A) is preferably contained in an amount of 5% by mass or more.
- the dielectric constant ( ⁇ ) at a frequency of 1 MHz of the adhesive composition described above is preferably 3.0 or less and the dielectric loss tangent (tan ⁇ ) is 0.02 or less.
- the adhesive composition described in any one of the above is preferably used for adhesion between a resin substrate and a resin substrate or a metal substrate.
- An adhesive sheet containing the laminate An adhesive sheet containing the laminate.
- a printed wiring board containing the laminate or the adhesive sheet as a constituent element A printed wiring board containing the laminate or the adhesive sheet as a constituent element.
- the adhesive composition according to the present invention contains a crystalline acid-modified polyolefin and an amorphous polyolefin, and further contains at least one of a carbodiimide resin and an epoxy resin. Therefore, it exhibits excellent low dielectric properties, and can obtain not only conventional polyimide and polyester films, but also high adhesion between low polarity resin substrates such as LCP and metal substrates, and high solder heat resistance. .
- crystalline acid-modified polyolefin (A) >
- the component (A) is a crystalline acid-modified polyolefin.
- the crystalline acid-modified polyolefin (A) used in the present invention is not limited, but is a crystalline one obtained by grafting at least one of ⁇ , ⁇ -unsaturated carboxylic acid and its acid anhydride onto a polyolefin resin.
- 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 acid value of the crystalline acid-modified polyolefin (A) is not particularly limited from the viewpoints of heat resistance and adhesion to a resin substrate or a metal substrate, but is preferably 50 equivalents / 10 6 g or more. , More preferably 100 equivalents / 10 6 g or more, further preferably 150 equivalents / 10 6 g or more, particularly preferably 200 equivalents / 10 6 g or more, and most preferably 250 equivalents / 10 6 g or more. It is. If it is less than the above value, the compatibility with the epoxy resin (D) and / or 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 not particularly limited, but is preferably 1000 equivalents / 10 6 g or less, more preferably 900 equivalents / 10 6 g or less, still more preferably 800 equivalents / 10 6 g or less, and particularly preferably 700 Equivalent / 10 6 g or less, and most preferably 600 equivalent / 10 6 g or less.
- the adhesiveness may decrease.
- the viscosity and stability of a solution may fall, and pot life property may fall. Furthermore, it is not preferable because the production efficiency is also lowered.
- the weight average molecular weight (Mw) of the crystalline acid-modified polyolefin (A) is preferably in the range of 40,000 to 180,000. More preferably, it is in the range of 50,000 to 160,000, more preferably in the range of 60,000 to 150,000, particularly preferably in the range of 70,000 to 140,000, and most preferably 80. , 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 crystallinity in the crystalline acid-modified polyolefin (A) means that the temperature is raised from ⁇ 100 ° C. to 250 ° C. at 20 ° C./min using a differential scanning calorimeter (DSC), and the melting process is clearly melted. This refers to the peak.
- DSC differential scanning calorimeter
- the melting point (Tm) of the crystalline acid-modified polyolefin (A) is preferably in the range of 50 ° C to 120 ° C. More preferably, it is in the range of 60 ° C to 100 ° C, and most preferably in the range of 70 ° C to 90 ° C. If it is less than the above value, the cohesive force derived from the crystal becomes weak, and the adhesiveness and heat resistance may be inferior. On the other hand, when the above value is exceeded, the solution stability and fluidity are low, and there may be a problem in operability when bonding.
- the heat of fusion ( ⁇ H) of the crystalline acid-modified polyolefin (A) is preferably in the range of 5 J / g to 60 J / g.
- a range of 10 J / g to 50 J / g is more preferable, and a range of 20 J / g to 40 J / g is most preferable. If it is less than the above value, the cohesive force derived from the crystal becomes weak, and the adhesiveness and heat resistance may be inferior. On the other hand, when the above value is exceeded, the solution stability and fluidity are low, and there may be a problem in operability when bonding.
- the production method of the crystalline acid-modified polyolefin (A) is not particularly limited.
- a radical graft reaction that is, a radical species is generated with respect to a polymer to be 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.
- the content of the component (A) in the adhesive composition of the present invention is preferably 5% by mass or more, more preferably 7% by mass or more, and further preferably 10% by mass or more. Moreover, it is preferable that it is 90 mass% or less, 80 mass% or less is more preferable, and 70 mass% or less is further more preferable. If it is too little or too much, the adhesiveness and heat resistance may be lowered.
- ⁇ (B) component amorphous polyolefin (B)>
- the component (B) is an amorphous polyolefin.
- the amorphous polyolefin (B) used in the present invention is not limited, but homopolymerization of olefin monomers exemplified by ethylene, propylene, butene, butadiene, isoprene, etc., or copolymerization with other monomers, and obtained Of the polymers mainly composed of a hydrocarbon skeleton, such as hydrides and halides of polymers, amorphous ones are preferred.
- Amorphous in the amorphous polyolefin (B) is the heat of fusion ( ⁇ H) when the temperature is raised from ⁇ 100 ° C. to 250 ° C. at 20 ° C./min using a differential scanning calorimeter (DSC). What is 10 J / g or less is preferable.
- amorphous polyolefin By compounding amorphous polyolefin, stress concentration of peeling stress at the interface between the adhesive and the substrate can be prevented by improving the wettability of the adhesive to the substrate and the flexibility of the adhesive composition. .
- the heat of fusion ( ⁇ H) of the amorphous polyolefin (B) is preferably 10 J / g or less, more preferably 5 J / g or less, and even more preferably 3 J / g or less. Although a minimum is not specifically limited, It is 0 J / g or more. When the above value is exceeded, the degree of crystallinity becomes high, so that the wettability to the substrate is lowered, and the peeling stress is concentrated on the interface, so that the adhesive strength may be lowered.
- the glass transition temperature (Tg) of the amorphous polyolefin (B) is preferably in the range of ⁇ 70 to 30 ° C. More preferably, it is in the range of ⁇ 50 ° C. to 25 ° C., and most preferably in the range of ⁇ 30 ° C. to 20 ° C. If it is less than the above value, the tackiness of the adhesive is strong and the processability may be inferior. On the other hand, when the above value is exceeded, there is a problem that the adhesiveness near room temperature is lowered.
- the content of the amorphous polyolefin (B) is preferably in the range of 10 to 100 parts by mass with respect to 100 parts by mass of the crystalline acid-modified polyolefin (A).
- a more preferred range is 13 to 90 parts by mass, and a most preferred range is 15 to 80 parts by mass. If it is less than the above value, the wettability to the substrate is lowered, and the peeling stress is concentrated on the interface, so that the adhesive strength may be lowered. When the above value is exceeded, the strength of the adhesive composition itself is lowered, and there is a problem that the adhesive is lowered.
- carbodiimide resin (C)> Component (C) is a carbodiimide resin.
- 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 acid-modified polyolefin (A) reacts with the carbodiimide, so that the interaction between the adhesive composition and the substrate can be enhanced and the adhesiveness can be improved.
- the content of the carbodiimide resin (C) is preferably in the range of 0.5 to 30 parts by mass with respect to 100 parts by mass of the crystalline acid-modified polyolefin (A). 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 and the low dielectric properties are lowered.
- Epoxy resin (D)> (D) A component is an epoxy resin.
- the epoxy resin (D) is not particularly limited as long as it has two or more glycidyl groups in the molecule.
- Bisphenol A type epoxy resin, novolak type epoxy resin or dicyclopentadiene type epoxy resin is preferable.
- the content of the epoxy resin (D) is preferably in the range of 1 to 30 parts by mass with respect to 100 parts by mass of the crystalline acid-modified polyolefin (A).
- the range of parts by mass is more preferable, and the range of 3 to 10 parts by mass is most preferable. If it is less than the said range, sufficient hardening effect cannot be acquired but adhesiveness and heat resistance may fall. Further, if the amount is within the above range, there are problems that the pot life of the adhesive is lowered and the low dielectric properties are lowered.
- the adhesive composition of the present invention contains the crystalline acid-modified polyolefin (A) and the amorphous polyolefin (B), and further contains any one of a carbodiimide resin (C) and an epoxy resin (D). It is a thing.
- the adhesive composition of the present invention contains the component (A), the component (B) and the component (C), so that the electrical properties (low dielectric properties) are excellent, and a low-polarity resin substrate such as LCP and a metal High adhesiveness with the substrate can be expressed. Moreover, by containing (A) component, (B) component, and (D) component, it is excellent in electrical characteristics, and expresses high solder heat resistance between a low polarity resin substrate such as LCP and a metal substrate. Can do. Furthermore, by including the components (A) to (D), all of excellent adhesion between a low-polarity resin substrate such as LCP and a metal substrate, solder heat resistance, and electrical properties (low dielectric properties) are exhibited. be able to.
- the adhesive film (adhesive layer) after applying and curing the adhesive composition on the substrate exhibits excellent low dielectric constant characteristics.
- the dielectric constant ( ⁇ ) at a frequency of 1 MHz of the cured adhesive coating film is preferably 3.0 or less, more preferably 2.6 or less, and 2.3 or less. More preferably.
- the dielectric loss tangent (tan ⁇ ) is preferably 0.02 or less, more preferably 0.01 or less, and further preferably 0.005 or less.
- the adhesive composition of the present invention preferably has a dielectric constant ( ⁇ ) of 3.0 or less in the entire region of the frequency of 1 MHz to 1 GHz of the adhesive coating film after curing, and preferably 2.6 or less. More preferably, it is 2.3 or less.
- the dielectric loss tangent (tan ⁇ ) is preferably 0.02 or less, more preferably 0.01 or less, and further preferably 0.005 or less. Further, it is particularly preferable that the dielectric constant ( ⁇ ) and the dielectric loss tangent (tan ⁇ ) in the entire region of the frequency of 1 MHz to 10 GHz of the cured adhesive coating film are within the above ranges.
- the adhesive composition of the present invention can further contain an organic solvent (E).
- the organic solvent (E) used in the present invention is particularly limited as long as it dissolves the crystalline acid-modified polyolefin (A), the amorphous polyolefin (B), the carbodiimide resin (C), and the epoxy resin (D). Not.
- 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
- a preferred embodiment is a mixed solvent of an alicyclic hydrocarbon and a ketone solvent, and among them, cyclohexane or methylcyclohexane is preferably used for the alicyclic hydrocarbon, and methyl isobutyl ketone or methyl ethyl ketone is preferably used for the ketone solvent.
- the organic solvent (E) is preferably in the range of 100 to 1000 parts by weight, more preferably in the range of 200 to 900 parts by weight, with respect to 100 parts by weight of the crystalline acid-modified polyolefin (A). Most preferably, it is at least 800 parts by mass. If it is less than the said range, liquid state and pot life property will 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 of the present invention may further contain other components as necessary.
- specific examples of such components include flame retardants, tackifiers, fillers, and silane coupling agents.
- flame retardants You may mix
- the flame retardant include bromine, phosphorus, nitrogen, and metal hydroxide compounds.
- phosphorus-based flame retardants are preferable, and phosphoric acid esters such as trimethyl phosphate, triphenyl phosphate, tricresyl phosphate, phosphates such as aluminum phosphinate, phosphazenes, and other known phosphorus flame retardants can be used. .
- the flame retardant is preferably contained in the range of 1 to 200 parts by mass, and more preferably in the range of 5 to 150 parts by mass with respect to 100 parts by mass in total of the components (A) to (D).
- the range of 10 to 100 parts by mass is most preferable. If it is less than the said range, a flame retardance is low.
- the above range is exceeded, there is a problem that the adhesiveness, heat resistance, electrical characteristics and the like deteriorate.
- 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.
- blend fillers such as a silica
- blend fillers such as a silica
- 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 components (A) to (D). If it is less than 0.05 parts by mass, the effect of improving the heat resistance may not be exhibited. On the other hand, when the amount exceeds 30 parts by mass, there may be a case where poor dispersion of silica occurs, the solution viscosity becomes too high, and the workability is deteriorated or the adhesiveness is lowered.
- 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, if it exceeds 20 parts by mass, heat resistance failure and adhesiveness may decrease.
- the laminate of the present invention is a laminate in which an adhesive composition is laminated on a substrate (two-layer laminate of substrate / adhesive layer), or a laminate in which a substrate is further bonded (substrate / adhesive layer / 3 layer laminate of base materials).
- an adhesive layer means the layer of the adhesive composition after apply
- the substrate is not particularly limited as long as it can apply and dry the adhesive composition of the present invention to form an adhesive layer, but it is not limited to a resin substrate such as a film-like resin, metal Examples thereof include metal substrates such as plates and metal foils, and papers.
- the resin base material examples include polyester resin, polyamide resin, polyimide resin, polyamideimide resin, liquid crystal polymer, polyphenylene sulfide, syndiotactic polystyrene, polyolefin resin, and fluorine resin.
- a film-like resin hereinafter also referred to as a base film layer is preferable.
- any conventionally known conductive material that can be used for the circuit board can be used.
- 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.
- paper examples include high-quality paper, kraft paper, roll paper, and glassine paper.
- glass epoxy etc. can be illustrated as a composite material.
- polyester resin polyamide resin, polyimide resin, polyamideimide resin, liquid crystal polymer, polyphenylene sulfide, syndiotactic polystyrene, polyolefin resin, fluorine resin, A SUS steel plate, copper foil, aluminum foil, or glass epoxy is preferred.
- the adhesive sheet is obtained by laminating the laminate and the release substrate via an adhesive composition.
- Specific examples of the configuration include laminate / adhesive layer / release substrate, or release substrate / adhesive layer / laminate / adhesive layer / release substrate.
- the release substrate By laminating the release substrate, it functions as a protective layer for the substrate. Further, by using a release substrate, the release substrate can be released from the adhesive sheet, and the adhesive layer can be transferred to another substrate.
- the adhesive sheet of the present invention can be obtained by applying and drying the adhesive composition of 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 method of 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 thickness of the adhesive layer after drying is appropriately changed as necessary, but is preferably in the range of 5 to 200 ⁇ m. When the adhesive film thickness is less than 5 ⁇ m, the adhesive strength is insufficient. When the thickness is 200 ⁇ m or more, there is a problem that drying is insufficient, a residual solvent increases, and bulge is generated at the time of printed circuit board production.
- 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 “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 of the present invention can be suitably used for each adhesive layer of a printed wiring board.
- the adhesive composition of the present invention when used as an adhesive, it has high adhesion to low-polarity resin base materials such as LCP as well as conventional polyimide, polyester film and copper foil constituting printed wiring boards. 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.
- any conventionally known insulating film can be used as an insulating film for a printed wiring board.
- manufactured from various polymers such as polyimide, polyester, polyphenylene sulfide, polyethersulfone, polyetheretherketone, aramid, polycarbonate, polyarylate, polyimide, polyamideimide, liquid crystal polymer, polyphenylene sulfide, syndiotactic polystyrene, polyolefin resin, etc.
- Film can be used. More preferably, 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 collectively 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 to be a base film to the metal foil, and initial drying of the coating film (B) (A) and the metal foil obtained in the initial stage It can be obtained by a production method including a step of heat-treating and drying the laminate with the dried coating film (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 active 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-side semi-finished product, or after being laminated and stored with the release film for pasting with the base-film-side semi-finished product. May be used.
- 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 agent side semi-finished product are all laminated bodies for printed wiring boards in the present invention.
- Acid Value The acid value (equivalent / 10 6 g) in the present invention was determined by using a FT-IR (manufactured by Shimadzu Corporation, FT-IR8200PC) and a stretching peak (1780 cm) of a carbonyl (C ⁇ O) bond of maleic anhydride.
- -1 absorbance (I)
- isotactic specific peak 840 cm -1
- absorbance II
- factor f
- Acid value [absorbance (I) / absorbance (II) ⁇ (f) / molecular weight of maleic anhydride ⁇ 2 ⁇ 10 4 ]
- Weight average molecular weight (Mw) The weight average molecular weight in the present invention is a value measured by gel permeation chromatography (hereinafter, GPC, standard substance: polystyrene resin, mobile phase: tetrahydrofuran).
- Melting point (Tm), heat of fusion ( ⁇ H), glass transition temperature (Tg) In the present invention, the melting point, heat of fusion, and glass transition temperature (Tg) were annealed from room temperature to 200 ° C. at a rate of 20 ° C./min using a differential scanning calorimeter (hereinafter referred to as DSC), and then rapidly cooled with liquid nitrogen The temperature is increased from ⁇ 100 ° C. to 200 ° C. at a rate of 20 ° C./min, the intersection of the tangent at the base line and the inflection point (glass transition temperature), the top temperature (melting point) of the melting peak, It is a value measured from the area surrounded by the extension line and the melting peak.
- DSC differential scanning calorimeter
- Pot life property means that a crystalline acid-modified polyolefin, an amorphous polyolefin, a carbodiimide resin, and an epoxy resin are blended and immediately after blending or after 24 hours have elapsed in a room temperature atmosphere after blending. Refers to the stability of the solution. If the pot life is good, it means that the viscosity of the solution is small and can be stored for a long time. If the pot life is poor, the viscosity of the solution increases (thickens). It means that gelation occurs, application to a substrate becomes difficult, and long-term storage is impossible. ⁇ Evaluation criteria> ⁇ : Applicable ⁇ : Increased in viscosity and inferior in workability, but can be applied ⁇ : Not applicable due to increased viscosity or gelation
- 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 570 equivalent / 10 6 g, weight average molecular weight 55,000, Tm 75 ° C., ⁇ H25J / G).
- CO-1 acid value 570 equivalent / 10 6 g
- Production Example 2 A maleic anhydride-modified propylene-butene copolymer (CO-2, acid value 410 equivalents / 10 6 g, weight) except that the amount of maleic anhydride charged was changed to 19 parts by mass. Average molecular weight 60,000, Tm 75 ° C., ⁇ H 30 J / g).
- Production Example 3 A maleic anhydride-modified propylene-butene copolymer was prepared in the same manner as in Production Example 1 except that the amount of maleic anhydride charged was changed to 4 parts by mass and that of di-tert-butyl peroxide was changed to 0.5 parts by mass.
- CO-3 acid value 150 equivalent / 10 6 g, weight average molecular weight 160,000, Tm 80 ° C., ⁇ H 25 J / g).
- Production Example 4 A maleic anhydride-modified propylene-butene copolymer (CO-4, acid value of 980 equivalents / 10 6 g, weight) except that the amount of maleic anhydride charged was changed to 30 parts by mass. Average molecular weight 40,000, Tm 70 ° C., ⁇ H25 J / g).
- Production Example 5 A maleic anhydride-modified propylene-butene copolymer was prepared in the same manner as in Production Example 1 except that the amount of maleic anhydride charged was changed to 2 parts by mass and the amount of di-tert-butyl peroxide was changed to 0.5 parts by mass.
- CO-5 acid value 53 equivalent / 10 6 g, weight average molecular weight 200,000, Tm 80 ° C., ⁇ H 25 J / g).
- Example 1 In a 500 ml four-necked flask equipped with a water-cooled reflux condenser and a stirrer, 100 parts by mass of the maleic anhydride-modified propylene-butene copolymer (CO-1) obtained in Production Example 1 and amorphous acid modification 100 parts by mass of polyolefin solution (20 parts by mass as a solid resin), 224 parts by mass of methylcyclohexane, and 96 parts by mass of methyl ethyl ketone were charged, heated to 80 ° C. with stirring, and dissolved by continuing stirring for 1 hour.
- CO-1 maleic anhydride-modified propylene-butene copolymer
- amorphous acid modification 100 parts by mass of polyolefin solution (20 parts by mass as a solid resin), 224 parts by mass of methylcyclohexane, and 96 parts by mass of methyl ethyl ketone were charged, heated to 80 ° C. with stirring, and dissolved by
- the solution obtained by cooling was mixed with 5 parts by mass of carbodiimide resin V-05 and 10 parts by mass of epoxy resin YDCN-700-10 to obtain an adhesive composition.
- Table 1 shows the blending amount, pot life, adhesive strength, solder heat resistance, and electrical characteristics (frequency 1 MHz).
- Examples 2 to 13 The crystalline acid-modified polyolefin, the amorphous polyolefin, the carbodiimide resin, and the epoxy resin are changed to those shown in Table 1, and are changed to the respective compounding amounts shown in Table 1 in the same manner as in Example 1. Examples 2 to 13 were performed. Table 1 shows the pot life, adhesive strength, solder heat resistance, and electrical characteristics (frequency 1 MHz). In Example 2, the electrical characteristics were measured under the condition of a frequency of 1 GHz. As a result, the dielectric constant ( ⁇ ) was evaluated as “ ⁇ ” and the dielectric loss tangent (tan ⁇ ) was evaluated as “ ⁇ ”.
- Comparative Example 1 The crystalline acid-modified polyolefin, the amorphous polyolefin, the carbodiimide resin, and the epoxy resin are changed to those shown in Table 2, and are changed in the same manner as in Example 1 so that the blending amounts shown in Table 2 are obtained.
- Example 1 was performed.
- Table 2 shows the blending amount, pot life, adhesive strength, solder heat resistance, and electrical characteristics (frequency 1 MHz).
- Comparative Example 2 Carboxyl group-containing acrylonitrile butadiene rubber NBR (manufactured by JSR Co., Ltd.), carbodiimide resin, and epoxy resin were changed to those shown in Table 2, and changed to the compounding amounts shown in Table 2 in the same manner as in Example 1. Comparative Example 2 was performed. Table 2 shows the blending amount, pot life, adhesive strength, solder heat resistance, and electrical characteristics (frequency 1 MHz). When the electrical characteristics were measured under the condition of a frequency of 1 GHz, the dielectric constant ( ⁇ ) was evaluated as “x” and the dielectric loss tangent (tan ⁇ ) was evaluated as “x”.
- the carbodiimide resin (C) and epoxy resin (D) used in Tables 1 and 2 are as follows.
- 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 obtain an adhesive composition excellent in low dielectric properties, an adhesive sheet, and a laminated body bonded using the adhesive composition. Due to the above characteristics, it is useful in flexible printed wiring board applications, particularly in FPC applications that require low dielectric properties (low dielectric constant, low dielectric loss tangent) in a high frequency region.
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- General Chemical & Material Sciences (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Laminated Bodies (AREA)
- Adhesive Tapes (AREA)
- Manufacturing Of Printed Wiring (AREA)
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。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。
一方、ポリオレフィン樹脂は、低誘電特性を有することが知られている。そこで、ポリオレフィン樹脂を用いたFPC用接着剤組成物が提案されている。たとえば、特許文献1では、FPCの電気特性を高めるために、オレフィン骨格を導入した変性ポリアミド接着剤組成物が提案されている。また、特許文献2では、芳香族オレフィンオリゴマー型改質剤とエポキシ樹脂を用いた接着剤及びフレキシブルプリント配線板カバーレイが提案されている。
また、LCP基材を用いる場合は、接着剤を用いずにLCPを溶融させ、銅箔と貼り合せて2層基板を作製する方法がある。しかしながらこの方法は、高温で貼り合せる機台が必要であったり、加工時にシワが入りやすく、歩留まりが低下したりするという問題がある。
(A)成分:結晶性酸変性ポリオレフィン
(B)成分:非晶性ポリオレフィン
(C)成分:カルボジイミド樹脂
(D)成分:エポキシ樹脂
(A)成分は、結晶性酸変性ポリオレフィンである。本発明で用いる結晶性酸変性ポリオレフィン(A)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結晶性の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、結晶性酸変性ポリオレフィンは、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結晶性のものが好ましい。
(B)成分は、非晶性ポリオレフィンである。本発明で用いる非晶性ポリオレフィン(B)は限定的ではないが、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のうち、非晶性のものであることが好ましい。
(C)成分は、カルボジイミド樹脂である。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、酸変性ポリオレフィン(A)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。
(D)成分は、エポキシ樹脂である。エポキシ樹脂(D)としては、分子中に2個以上のグリシジル基を有するものであれば、特に限定されない。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。
本発明の接着剤組成物は、前記結晶性酸変性ポリオレフィン(A)および非晶性ポリオレフィン(B)を含有し、さらにカルボジイミド樹脂(C)およびエポキシ樹脂(D)のいずれか一方を含有する組成物である。
本発明の接着剤組成物は、さらに有機溶剤(E)を含有することができる。本発明で用いる有機溶剤(E)は、結晶性酸変性ポリオレフィン(A)、非晶性ポリオレフィン(B)、カルボジイミド樹脂(C)、およびエポキシ樹脂(D)を溶解させるものであれば、特に限定されない。具体的には、例えば、ベンゼン、トルエン、キシレン等の芳香族炭化水素、ヘキサン、ヘプタン、オクタン、デカン等の脂肪族系炭化水素、シクロヘキサン、シクロヘキセン、メチルシクロヘキサン、エチルシクロへキサン等の脂環族炭化水素、トリクロルエチレン、ジクロルエチレン、クロルベンゼン、クロロホルム等のハロゲン化炭化水素、メタノール、エタノール、イソプロピルアルコール、ブタノール、ペンタノール、ヘキサノール、プロパンジオール、フェノール等のアルコール系溶剤、アセトン、メチルイソブチルケトン、メチルエチルケトン、ペンタノン、ヘキサノン、シクロヘキサノン、イソホロン、アセトフェノン等のケトン系溶剤、メチルセルソルブ、エチルセルソルブ等のセルソルブ類、酢酸メチル、酢酸エチル、酢酸ブチル、プロピオン酸メチル、ギ酸ブチル等のエステル系溶剤、エチレングリコールモノn -ブチルエーテル、エチレングリコールモノi s o -ブチルエーテル、エチレングリコールモノt e r t - ブチルエーテル、ジエチレングリコールモノn -ブチルエーテル、ジエチレングリコールモノi s o -ブチルエーテル、トリエチレングリコールモノn -ブチルエーテル、テトラエチレングリコールモノn -ブチルエーテ等のグリコールエーテル系溶剤等を使用することができ、これら1種または2種以上を併用することができる。好ましい態様としては、脂環族系炭化水素とケトン系溶剤の混合溶剤であり、なかでも脂環族炭化水素にシクロヘキサンまたはメチルシクロヘキサンを用い、ケトン系溶剤にメチルイソブチルケトンまたはメチルエチルケトンを用いることが好ましい。また、脂環族系炭化水素とケトン系溶剤の混合比率は、脂環族系炭化水素/ケトン系溶剤=50~90/50~10(質量比)であることが好ましく、55~85/45~15(質量比)であることがより好ましく、60~80/40~20(質量比)であることがさらに好ましい。
本発明の接着剤組成物には必要に応じて難燃剤を配合しても良い。難燃剤としては、臭素系、リン系、窒素系、水酸化金属化合物等が挙げられる。中でも、リン系難燃剤が好ましく、リン酸エステル、例えば、トリメチルホスフェート、トリフェニルホスフェート、トリクレジルホスフェート等、リン酸塩、例えばホスフィン酸アルミニウム等、ホスファゼン等の公知のリン系難燃剤を使用できる。難燃剤を含有させる場合、成分(A)~(D)の合計100質量部に対し、難燃剤を1~200質量部の範囲で含有させることが好ましく、5~150質量部の範囲がより好ましく、10~100質量部の範囲が最も好ましい。前記範囲未満では、難燃性が低い。前記範囲を超えると接着性、耐熱性、電気特性等が悪化する問題がある。
本発明の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。
本発明の接着剤組成物には必要に応じてシリカなどの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、成分(A)~(D)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質量部を越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。
本発明の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成分(A)~(D)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質量部を越えると耐熱性不良や接着性が低下する場合がある。
本発明の積層体は、基材に接着剤組成物を積層したもの(基材/接着剤層の2層積層体)、または、さらに基材を貼り合わせたもの(基材/接着剤層/基材の3層積層体)である。ここで、接着剤層とは、本発明の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。本発明の接着剤組成物を、常法に従い、各種基材に塗布、乾燥すること、およびさらに他の基材を積層することにより、本発明の積層体を得ることができる。
本発明において基材とは、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、金属板や金属箔等の金属基材、紙類等を挙げることができる。
本発明において、接着シートとは、前記積層体と離型基材とを接着剤組成物を介して積層したものである。具体的な構成態様としては、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、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。
本発明における酸価(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-1)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である。
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
本発明における重量平均分子量はゲルパーミエーションクロマトグラフィー(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)によって測定した値である。
本発明における融点、融解熱量、ガラス転移温度(Tg)は示差走査熱量計(以下、DSC)を用いて、室温から200℃まで20℃/分の昇温速度でアニーリングさせ、液体窒素で急冷後、-100℃から200℃まで20℃/分の昇温速度で昇温し、ベースラインと変曲点での接線の交点(ガラス転移温度)と融解ピークのトップ温度(融点)およびベースラインの延長線と融解ピークで囲まれる面積から測定した値である。
ポットライフ性とは、結晶性酸変性ポリオレフィン、非晶性ポリオレフィン、カルボジイミド樹脂、およびエポキシ樹脂を配合し、その配合直後または、配合後室温雰囲気下24時間経過後の該溶液の安定性を指す。ポットライフ性が良好な場合は、溶液の粘度上昇が少なく長期間保存が可能であることを指し、ポットライフ性が不良な場合は、溶液の粘度が上昇(増粘)し、ひどい場合にはゲル化現象を起こし、基材への塗布が困難となり、長期間保存が不可能であることを指す。
<評価基準>
○:塗布可能
△:粘度上昇があり、加工性に劣るが、塗布可能
×:粘度上昇、またはゲル化により塗布不可
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)、または、厚さ50μmのLCPフィルム(株式会社クラレ製、ベクスター)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>
☆:1.5N/mm以上
◎:1.3N/mm以上1.5N/mm未満
○:1.0N/mm以上1.3N/mm未満
△:0.8N/mm以上1.0N/mm未満
×:0.8N/mm未満
上記と同じ方法でサンプルを作製し、2.5cm×2.5cm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
△:270℃以上290℃未満
×:270℃未満
後述する接着剤組成物を厚さ50μmの離型フィルムに、乾燥後の厚みが30μm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、離型フィルムから剥がして測定を行った。PRECISION LCR meter HP-4284Aを用いて、22℃58%RH下、周波数1MHzの条件で測定を行い、以下の通りに評価した。同じように、VECTOR NETWORK ANALYZER HP8510C、SYNTHESIZED SWEEPER HP83651A、TEST SET HP8517Bを用いて、22℃58RH%下、周波数1GHzの条件で測定を行い、以下の通りに評価した。
<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
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22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570当量/106g、重量平均分子量55,000、Tm75℃、△H25J/g)を得た。
無水マレイン酸の仕込み量を19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410当量/106g、重量平均分子量60,000、Tm75℃、△H30J/g)を得た。
無水マレイン酸の仕込み量を4質量部、ジ-tert-ブチルパーオキサイドを0.5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-3、酸価150当量/106g、重量平均分子量160,000、Tm80℃、△H25J/g)を得た。
無水マレイン酸の仕込み量を30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-4、酸価980当量/106g、重量平均分子量40,000、Tm70℃、△H25J/g)を得た。
無水マレイン酸の仕込み量を2質量部、ジ-tert-ブチルパーオキサイドを0.5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-5、酸価53当量/106g、重量平均分子量200,000、Tm80℃、△H25J/g)を得た。
製造例6
1Lオートクレーブに、非晶性ポリオレフィン(住友化学社製「タフセレン(登録商標)X1102)100質量部、メチルシクロヘキサン150質量部及び無水マレイン酸1質量部、ジ-tert-ブチルパーオキサイド1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、メチルシクロヘキサン130質量部、メチルエチルケトン120質量部を加え、非晶性酸変性ポリオレフィン(AO-1、酸価50当量/106g、重量平均分子量140,000、△H0J/g、Tg-10℃)の溶液を得た。
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、非晶性ポリオレフィン(住友化学社製「タフセレン(登録商標)X1102)100質量部、メチルシクロヘキサン280質量部、メチルエチルケトン120質量部を加え、非晶性ポリオレフィン(タフセレン X1102、酸価0当量/106g、重量平均分子量658,000、△H0J/g、Tg-9℃)の溶液を得た。
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100質量部、非晶性酸変性ポリオレフィン溶液を100質量部(固形樹脂として20質量部)、メチルシクロヘキサンを224質量部、メチルエチルケトンを96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-05を5質量部、エポキシ樹脂YDCN-700-10を10質量部配合し、接着剤組成物を得た。配合量、ポットライフ、接着強度、ハンダ耐熱性、電気特性(周波数1MHz)を表1に示す。
結晶性酸変性ポリオレフィン、非晶性ポリオレフィン、カルボジイミド樹脂、エポキシ樹脂を表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2~13を行った。ポットライフ、接着強度、ハンダ耐熱性、電気特性(周波数1MHz)を表1に示す。実施例2で、周波数1GHzの条件で電気特性の測定を行ったところ、誘電率(ε)の評価は「◎」、誘電正接(tanδ)の評価は「◎」であった。
結晶性酸変性ポリオレフィン、非晶性ポリオレフィン、カルボジイミド樹脂、エポキシ樹脂を表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を行った。配合量、ポットライフ、接着強度、ハンダ耐熱性、電気特性(周波数1MHz)を表2に示す。
カルボキシル基含有アクリロニトリルブタジエンゴムNBR(株式会社JSR製)、カルボジイミド樹脂、エポキシ樹脂を表2に示すものに変更し、実施例1と同様な方法で、表2に示す配合量となるように変更し、比較例2を行った。配合量、ポットライフ、接着強度、ハンダ耐熱性、電気特性(周波数1MHz)を表2に示す。周波数1GHzの条件で電気特性の測定を行ったところ、誘電率(ε)の評価は「×」、誘電正接(tanδ)の評価は「×」であった。
カルボジイミド樹脂:V-05(日清紡ケミカル社製)
カルボジイミド樹脂:V-03(日清紡ケミカル社製)
o-クレゾールノボラック型エポキシ樹脂:YDCN-700-10(新日鉄住金化学社製)
ビスフェノールA型エポキシ樹脂:JER-828(三菱化学社製)
ジシクロペンタジエン型エポキシ樹脂:HP-7200(DIC社製)
Claims (11)
- 下記(A)成分および(B)成分を含有し、さらに(C)成分および(D)成分の少なくとも一方を含有する接着剤組成物。
(A)成分:結晶性酸変性ポリオレフィン
(B)成分:非晶性ポリオレフィン
(C)成分:カルボジイミド樹脂
(D)成分:エポキシ樹脂 - (A)成分が5質量%以上含有する請求項1に記載の接着剤組成物。
- (A)成分、(B)成分および(C)成分を含有し、(A)成分100質量部に対して、(B)成分10~100質量部、(C)成分0.5~30質量部含有する請求項1または2に記載の接着剤組成物。
- (A)成分、(B)成分および(D)成分を含有し、(A)成分100質量部に対して、(B)成分10~100質量部、(D)成分1~30質量部含有する請求項1または2に記載の接着剤組成物。
- (A)成分、(B)成分、(C)成分および(D)成分を含有し、(A)成分100質量部に対して、(B)成分10~100質量部、(C)成分0.5~30質量部、(D)成分1~30質量部含有する請求項1または2に記載の接着剤組成物。
- (A)成分100質量部に対して、有機溶剤(E)を100~1000質量部含有する請求項1~5のいずれかに記載の接着剤組成物。
- 周波数1MHzにおける、誘電率(ε)が3.0以下であり、誘電正接(tanδ)が0.02以下である請求項1~6のいずれかに記載の接着剤組成物。
- 樹脂基材と、樹脂基材または金属基材との接着に用いられる請求項1~7のいずれかに記載の接着剤組成物。
- 請求項1~8のいずれかに記載の接着剤組成物によって接着された樹脂基材と、樹脂基材または金属基材の積層体。
- 請求項9に記載の積層体を含有する接着シート。
- 請求項9に記載の積層体または請求項10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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PCT/JP2015/066736 WO2016031342A1 (ja) | 2014-08-27 | 2015-06-10 | 低誘電接着剤組成物 |
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JP (2) | JP6645431B2 (ja) |
KR (1) | KR102178215B1 (ja) |
CN (1) | CN106459704B (ja) |
TW (1) | TWI660021B (ja) |
WO (1) | WO2016031342A1 (ja) |
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TW201614027A (en) | 2016-04-16 |
CN106459704A (zh) | 2017-02-22 |
JP2019203136A (ja) | 2019-11-28 |
TWI660021B (zh) | 2019-05-21 |
KR102178215B1 (ko) | 2020-11-12 |
JP6761588B2 (ja) | 2020-09-30 |
KR20170047194A (ko) | 2017-05-04 |
CN106459704B (zh) | 2020-08-25 |
JPWO2016031342A1 (ja) | 2017-06-08 |
JP6645431B2 (ja) | 2020-02-14 |
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