WO2022181613A1 - 接着剤組成物、ならびにこれを含有する接着シート、積層体およびプリント配線板 - Google Patents
接着剤組成物、ならびにこれを含有する接着シート、積層体およびプリント配線板 Download PDFInfo
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- WO2022181613A1 WO2022181613A1 PCT/JP2022/007251 JP2022007251W WO2022181613A1 WO 2022181613 A1 WO2022181613 A1 WO 2022181613A1 JP 2022007251 W JP2022007251 W JP 2022007251W WO 2022181613 A1 WO2022181613 A1 WO 2022181613A1
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- WIPO (PCT)
- Prior art keywords
- adhesive
- adhesive composition
- polyol
- present
- amorphous
- Prior art date
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- UFDHBDMSHIXOKF-UHFFFAOYSA-N tetrahydrophthalic acid Natural products OC(=O)C1=C(C(O)=O)CCCC1 UFDHBDMSHIXOKF-UHFFFAOYSA-N 0.000 description 1
- 150000003609 titanium compounds Chemical class 0.000 description 1
- 150000003613 toluenes Chemical class 0.000 description 1
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- YGBFTDQFAKDXBZ-UHFFFAOYSA-N tributyl stiborite Chemical compound [Sb+3].CCCC[O-].CCCC[O-].CCCC[O-] YGBFTDQFAKDXBZ-UHFFFAOYSA-N 0.000 description 1
- UDUKMRHNZZLJRB-UHFFFAOYSA-N triethoxy-[2-(7-oxabicyclo[4.1.0]heptan-4-yl)ethyl]silane Chemical compound C1C(CC[Si](OCC)(OCC)OCC)CCC2OC21 UDUKMRHNZZLJRB-UHFFFAOYSA-N 0.000 description 1
- DQZNLOXENNXVAD-UHFFFAOYSA-N trimethoxy-[2-(7-oxabicyclo[4.1.0]heptan-4-yl)ethyl]silane Chemical compound C1C(CC[Si](OC)(OC)OC)CCC2OC21 DQZNLOXENNXVAD-UHFFFAOYSA-N 0.000 description 1
- BPSIOYPQMFLKFR-UHFFFAOYSA-N trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane Chemical compound CO[Si](OC)(OC)CCCOCC1CO1 BPSIOYPQMFLKFR-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- 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
- B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
- B32B27/281—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42 comprising polyimides
-
- 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
- B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
-
- 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
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/08—Macromolecular additives
-
- 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
- C09J167/00—Adhesives based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; 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
- C09J201/00—Adhesives based on unspecified macromolecular compounds
- C09J201/02—Adhesives based on unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups
- C09J201/06—Adhesives based on unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups containing oxygen atoms
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J7/00—Adhesives in the form of films or foils
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/35—Heat-activated
-
- 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
-
- 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
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/326—Applications of adhesives in processes or use of adhesives in the form of films or foils for bonding electronic components such as wafers, chips or semiconductors
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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
- 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 adhesive compositions. More particularly, it relates to an adhesive composition used for bonding a resin base material and a resin base material or a metal base material. In particular, it relates to an adhesive composition for flexible printed wiring boards (hereinafter abbreviated as FPC), and adhesive sheets, laminates and printed wiring boards containing the same.
- FPC flexible printed wiring boards
- Polyols are widely used as binders and additives in coatings and adhesives. Among them, polyester polyols have excellent adhesion to metals including copper, and are blended with curing agents such as epoxy resins. It has been used for adhesives such as FPC. (For example, Patent Document 1).
- FPC has excellent flexibility, so it can be used for multi-functionality and miniaturization of personal computers (PCs) and smartphones.
- PCs personal computers
- electronic devices have become smaller, lighter, denser, and higher in output, and the demand for the performance of wiring boards (electronic circuit boards) has become more and more sophisticated.
- high-frequency signals are being used to increase the transmission speed in FPC.
- FPCs are increasingly required to have low dielectric properties (low dielectric constant, low dielectric loss tangent) in a high frequency region. In order to achieve such low dielectric properties, measures have been taken to reduce the dielectric loss of FPC substrates and adhesives.
- Patent Document 2 proposes a thermosetting adhesive for printed wiring boards containing a carboxyl group-containing modified ester resin, an epoxy or isocyanate curing agent, and a thermosetting aid.
- the adhesive composition described in Patent Document 1 contains a polyester with a high acid value, which reacts with an epoxy resin to generate hydroxyl groups, and thus has a high dielectric constant and a high dielectric loss tangent. Therefore, it is not suitable for FPC in the high frequency range. Moreover, it is difficult to say that the adhesive described in Patent Document 2 has excellent heat resistance as an FPC adhesive, and its pot life is also insufficient.
- the adhesive composition of Patent Document 3 also did not satisfy low dielectric characteristics and pot life due to the reaction between the polyester having a high acid value and the curing agent or thermosetting aid.
- an object of the present invention is to provide an adhesive composition having excellent pot life, heat resistance, adhesive strength, low dielectric constant and dielectric loss tangent, and excellent dielectric properties, and an adhesive sheet, laminate and printed wiring containing the same. It is to provide a board.
- the present invention consists of the following configurations.
- the composition does not contain a compound having an isocyanate group.
- the composition does not contain compounds with an acid number exceeding 10 eq/10 6 g.
- the adhesive composition of the present invention can be thermally cured without having a carboxyl group, it can maintain a pot life at room temperature and suppress the generation of functional groups that deteriorate low dielectric properties. Therefore, it is excellent in dielectric properties, adhesive strength, solder heat resistance and pot life, and is suitable for FPC adhesives, adhesive sheets, laminates and printed wiring boards in the high frequency range.
- the adhesive composition of the present invention contains polycarbodiimide (A) and amorphous polyol (B) and satisfies the following (i) and (ii). (i) The composition does not contain a compound having an isocyanate group. (ii) The composition does not contain compounds with an acid number exceeding 10 eq/10 6 g.
- the adhesive composition of the present invention does not contain compounds having isocyanate groups.
- a compound having an isocyanate group means an isocyanate compound such as a general-purpose isocyanate curing agent, as well as a polycarbodiimide having an isocyanate group and a polyol having an isocyanate group. Since the adhesive composition of the present invention can be thermally cured without a compound having an isocyanate group, the reaction between the hydroxyl group and the isocyanate group of the amorphous polyol that reacts at low temperature by not containing these, and the isocyanate group and moisture reaction does not occur, the pot life can be improved.
- the adhesive composition of the present invention does not contain compounds with an acid number exceeding 10 eq/10 6 g.
- the acid value By setting the acid value within the above range, the reaction between the carboxyl group and the carbodiimide bond that react at low temperatures can be prevented, and the pot life can be improved.
- the adhesive composition does not contain a compound having an acid value exceeding 10 eq/10 6 g, the polycarbodiimide (A) and the amorphous polyol (B) do not have an acid value exceeding 10 eq/10 6 g. means that
- the polycarbodiimide (A) used in the present invention is not particularly limited as long as it has two or more carbodiimide bonds in the molecule, does not have an isocyanate group, and has an acid value not exceeding 10 eq/10 6 g. .
- heat resistance and adhesiveness can be improved by thermally curing the hydroxyl groups of the amorphous polyol (B) and the carbodiimide bond.
- the content of the polycarbodiimide (A) is preferably 1 part by mass or more, more preferably 3 parts by mass or more, relative to 100 parts by mass of the amorphous polyol (B). is.
- a crosslink density can be raised and solder heat resistance becomes favorable.
- it is preferably 20 parts by mass or less, more preferably 10 parts by mass or less.
- Examples of commercial products of polycarbodiimide (A) include trade names Carbodilite (registered trademark) V-02B, ElastostabH01, V-03, V-09, V-09GB manufactured by Nisshinbo Chemical Co., Ltd., and the like. may be used alone or may be used in combination.
- the amorphous polyol (B) used in the present invention is not particularly limited as long as it has two or more hydroxyl groups in its molecule, has no isocyanate group, and has an acid value of 10 eq/10 6 g or less.
- the amorphous polyol (B) must be amorphous from the viewpoint of pot life.
- the amorphous polyol (B) for example, at least one selected from the group consisting of polyester polyols, polyurethane polyols, polyether polyols, polycarbonate polyols and polyolefin polyols can be used. Polyester polyols are preferred. By using a polyester polyol with excellent flexibility, both adhesiveness and soldering heat resistance can be achieved.
- the amorphous polyol (B) used in the present invention preferably has a dielectric loss tangent (tan ⁇ ) of 0.006 or less. It is more preferably 0.005 or less, still more preferably 0.004 or less. The lower limit is not particularly limited, but practically it may be 0.0001 or more.
- amorphous polyol (B) have a low dielectric loss tangent, for example, polyolefins, dimer acid derivatives (dimer acid, dimer diamine, dimer diol, etc.), etc., are used as structural units constituting the amorphous polyol (B).
- Structural units having a long-chain hydrocarbon group with 10 or more carbon atoms structural units having condensed rings such as naphthalene dicarboxylic acid, hydrogenated naphthalene dicarboxylic acid, and tricyclodecanedimethanol (for example, 70 mol% or more) alone Alternatively, it can be achieved by containing them in an appropriate combination.
- the polyester polyol in the present invention has a chemical structure obtained by polycondensation of a polyhydric carboxylic acid component and a polyhydric alcohol component. It consists of selected ingredients.
- the polycarboxylic acid component contained in the polyester polyol of the present invention is preferably an aromatic polycarboxylic acid or an alicyclic polycarboxylic acid, and is preferably an aromatic dicarboxylic acid or an alicyclic dicarboxylic acid. More preferred. Excellent dielectric properties can be exhibited by using only the aromatic polycarboxylic acid component or the alicyclic polycarboxylic acid component as the constituent component.
- the aromatic dicarboxylic acid component is not particularly limited, but terephthalic acid, isophthalic acid, orthophthalic acid, 4,4'-dicarboxybiphenyl, 5-sodiumsulfoisophthalic acid, naphthalenedicarboxylic acid, or esters thereof may be used. can be done. Naphthalenedicarboxylic acid is preferable, and can exhibit excellent dielectric properties.
- the alicyclic dicarboxylic acid is not particularly limited, but 1,4-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, tetrahydrophthalic acid, methyltetrahydrophthalic acid, tetrahydrophthalic anhydride, methyltetrahydrophthalic anhydride , hydrogenated naphthalenedicarboxylic acids, and the like can be used.
- the polyhydric alcohol contained in the polyester polyol in the present invention is not particularly limited, but ethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 2-methyl-1,3-propanediol, neopentyl glycol, 1,5-pentanediol, 3-methyl-1,5-pentanediol, 1,6-hexanediol, 1,8 -octanediol, 2-methyl-2-ethyl-1,3-propanediol, 2,2-diethyl-1,3-propanediol, 2-ethyl-2-n-propyl-1,3-propanediol, 2 , 2-di-n-propyl-1,3-propanediol, 2-n-butyl-2-ethyl
- polyhydric carboxylic acid and polyhydric alcohol are heated in the presence of a known catalyst, and depolyhydric alcohol / 2)
- part or all of the acid component may be replaced with an acid anhydride.
- polyester polyol in the present invention When producing the polyester polyol in the present invention, conventionally known polymerization catalysts, for example, titanium compounds such as tetra-n-butyl titanate, tetraisopropyl titanate, titaniumoxyacetylcetonate, antimony trioxide, tributoxyantimony, etc.
- Antimony compounds, germanium compounds such as germanium oxide and tetra-n-butoxygermanium, and acetates such as magnesium, iron, zinc, manganese, cobalt and aluminum can be used.
- These catalysts can be used singly or in combination of two or more.
- the polyester polyol in the present invention preferably has a number average molecular weight of 5,000 or more, more preferably 10,000 or more. Also, it is preferably 100,000 or less, more preferably 50,000 or less, and even more preferably 30,000 or less. Within the above range, it is easy to handle when dissolved in a solvent, and excellent in dielectric properties, which is preferable.
- the adhesive composition of the present invention can contain an epoxy resin (C).
- the epoxy resin (C) used in the present invention is not particularly limited as long as it has an epoxy group in the molecule, but preferably has two or more epoxy groups in the 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, selected from the group consisting of tetraglycidyldiaminodiphenylmethane, triglycidyl para-aminophenol, tetraglycidylbisaminomethylcyclohexanone, N,N,N',N'-tetraglycidyl-m-xylenediamine, dimer acid-modified epoxy, and epoxy-modified polybutadiene; can be used.
- N,N,N',N'-tetraglycidyl-m-xylenediamine biphenyl-type epoxy resins, novolac-type epoxy resins, dicyclopentadiene-type epoxy resins, and dimer acid-modified epoxy or epoxy-modified polybutadiene. More preferred is N,N,N',N'-tetraglycidyl-m-xylenediamine. .
- the content of the epoxy resin (C) is preferably 0.1 parts by mass or more, more preferably 1 part by mass, relative to 100 parts by mass of the amorphous polyol (B). Department or above.
- the content of the epoxy resin (C) is preferably 0.1 parts by mass or more, more preferably 1 part by mass, relative to 100 parts by mass of the amorphous polyol (B). Department or above.
- the content is preferably 10 parts by mass or less, more preferably 5 parts by mass or less.
- the content is equal to or less than the above upper limit, good pot life and low dielectric properties are obtained. That is, within the above range, it is possible to obtain an adhesive composition having excellent low dielectric properties in addition to adhesiveness, solder heat resistance and pot life.
- the adhesive composition of 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 amorphous polyol (B) and polycarbodiimide (A).
- aromatic hydrocarbons such as benzene, toluene, and xylene
- aliphatic hydrocarbons such as hexane, heptane, octane, and decane
- alicyclic hydrocarbons such as cyclohexane, cyclohexene, methylcyclohexane, and ethylcyclohexane.
- trichlorethylene dichloroethylene, chlorobenzene, chloroform and other halogenated hydrocarbons
- the organic solvent is preferably in the range of 100 to 1000 parts by mass with respect to 100 parts by mass of the amorphous polyol (B).
- the organic solvent is preferably in the range of 100 to 1000 parts by mass with respect to 100 parts by mass of the amorphous polyol (B).
- 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.
- the adhesive composition of the present invention may optionally contain a flame retardant.
- flame retardants include bromine-based, phosphorus-based, nitrogen-based, and metal hydroxide compounds.
- phosphorus-based flame retardants are preferable, and known phosphorus-based flame retardants such as phosphate esters such as trimethyl phosphate, triphenyl phosphate, tricresyl phosphate, etc., phosphates such as aluminum phosphinate, and phosphazenes can be used. . These may be used alone, or may be used in any combination of two or more.
- a flame retardant When containing a flame retardant, it is preferable to contain a flame retardant in the range of 1 to 200 parts by weight with respect to a total of 100 parts by weight of the amorphous polyol (B) and the polycarbodiimide (A), and 5 to 150 parts by weight. is more preferred, and the range of 10 to 100 parts by mass is most preferred. By setting the content within the above range, it is possible to exhibit flame retardancy while maintaining adhesiveness, solder heat resistance, and electrical properties.
- a tackifier may be added to the adhesive composition of the present invention, if necessary.
- tackifiers include polyterpene resins, rosin resins, aliphatic petroleum resins, alicyclic petroleum resins, copolymer petroleum resins, styrene resins and hydrogenated petroleum resins. used in These may be used alone, or may be used in any combination of two or more.
- a tackifier is contained, it is preferably contained in the range of 1 to 200 parts by mass, and in the range of 5 to 150 parts by mass, with respect to the total 100 parts by mass of the amorphous polyol (B) and the polycarbodiimide (A). is more preferable, and the range of 10 to 100 parts by mass is most preferable.
- the adhesive composition of the present invention may optionally contain a filler.
- organic fillers include powders of heat-resistant resins such as polyimide, polyamideimide, fluororesin, and liquid crystal polyester.
- inorganic fillers include silica (SiO 2 ), alumina (Al 2 O 3 ), titania (TiO 2 ), tantalum oxide (Ta 2 O 5 ), zirconia (ZrO 2 ), silicon nitride (Si 3 N 4 ), boron nitride (BN), calcium carbonate ( CaCO3 ), calcium sulfate ( CaSO4 ), zinc oxide (ZnO), magnesium titanate (MgO- TiO2 ), barium sulfate ( BaSO4 ), organic bentonite, clay , mica, aluminum hydroxide, magnesium hydroxide, etc.
- silica is preferable from the viewpoint of ease of dispersion and effect of improving heat resistance.
- Hydrophobic silica and hydrophilic silica are generally known as silica, but here, hydrophobic silica treated with dimethyldichlorosilane, hexamethyldisilazane, octylsilane, etc. is used to impart moisture absorption resistance. is good.
- the blending amount is preferably 0.05 to 30 parts by mass with respect to a total of 100 parts by mass of the amorphous polyol (B) and the polycarbodiimide (A). Further heat resistance can be expressed by making it more than the said lower limit.
- the content is equal to or less than the above upper limit, poor dispersion of silica and excessive increase in solution viscosity are suppressed, and workability is improved.
- a silane coupling agent may be added to the adhesive composition of the present invention, if necessary. Addition of a silane coupling agent is very preferable because it improves adhesion to metals and heat resistance.
- the silane coupling agent is not particularly limited, examples thereof include those having an unsaturated group, those having an epoxy group, and those having an amino group.
- epoxy such as ⁇ -glycidoxypropyltrimethoxysilane, ⁇ -(3,4-epoxycyclohexyl)ethyltrimethoxysilane, and ⁇ -(3,4-epoxycyclohexyl)ethyltriethoxysilane is used from the viewpoint of heat resistance.
- a silane coupling agent having a group is more preferred.
- the blending amount is preferably 0.5 to 20 parts by mass per 100 parts by mass of the amorphous polyol (B) and the polycarbodiimide (A). Soldering heat resistance and adhesiveness can be improved by making it into the said range.
- the laminate of the present invention is obtained by laminating an adhesive composition on a base material (two-layer laminate of base material/adhesive layer), or further laminating a base material (base material/adhesive layer/ A three-layer laminate of substrates).
- the adhesive layer refers to a layer of the adhesive composition after the adhesive composition of the present invention has been applied to a substrate and dried.
- the laminate of the present invention can be obtained by applying the adhesive composition of the present invention to various substrates, drying it, and further laminating another substrate in accordance with conventional methods.
- the substrate is not particularly limited as long as the adhesive composition of the present invention can be applied and dried to form an adhesive layer.
- Examples include metal substrates such as plates and metal foils, papers, and the like.
- resin substrates examples include polyester resins, polyamide resins, polyimide resins, polyamideimide resins, liquid crystal polymers, polyphenylene sulfides, syndiotactic polystyrene, polyolefin resins, fluorine resins, and the like.
- 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 circuit boards can be used as the metal base material.
- materials include various metals such as SUS, copper, aluminum, iron, steel, zinc, and nickel, and their alloys, plated products, and metals treated with other metals such as zinc and chromium compounds.
- Metal foil is preferred, and copper foil is more preferred.
- the thickness of the metal foil is not particularly limited, it is preferably 1 ⁇ m or more, more preferably 3 ⁇ m or more, and still more preferably 10 ⁇ m or more. Also, it is preferably 50 ⁇ m or less, more preferably 30 ⁇ m or less, and still more preferably 20 ⁇ m or less. If the thickness is too thin, it may be difficult to obtain sufficient electrical performance of the circuit.
- Metal foils are usually provided in roll form.
- the form of the metal foil used in manufacturing the printed wiring board of the present invention is not particularly limited.
- the length is not particularly limited.
- the width is not particularly limited, but it is preferably about 250 to 500 cm.
- the surface roughness of the substrate is not particularly limited, but is preferably 3 ⁇ m or less, more preferably 2 ⁇ m or less, and still more preferably 1.5 ⁇ m or less. Moreover, it is practically preferably 0.3 ⁇ m or more, more preferably 0.5 ⁇ m or more, and still more preferably 0.7 ⁇ m or more.
- Examples of papers include high-quality paper, kraft paper, roll paper, and glassine paper. Moreover, glass epoxy etc. can be illustrated as a composite material.
- polyester resin Based on adhesive strength and durability with the adhesive composition, polyester resin, polyamide resin, polyimide resin, polyamideimide resin, liquid crystal polymer, polyphenylene sulfide, syndiotactic polystyrene, polyolefin resin, fluororesin, 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 configuration modes include laminate/adhesive layer/release substrate, or release substrate/adhesive layer/laminate/adhesive layer/release substrate.
- the release base material By laminating the release base material, it functions as a protective layer for the base material.
- the release base material can be released from the adhesive sheet, and the adhesive layer can be transferred to another base material.
- the adhesive sheet of the present invention can be obtained by applying the adhesive composition of the present invention to various laminates and drying them according to a conventional method.
- a release base material is applied to the adhesive layer after drying, it is possible to wind up the product without set-off to the base material, resulting in excellent workability and preservability due to the protection of the adhesive layer. excellent and easy to use.
- the adhesive layer itself is applied to a release base material and dried, and if necessary, another release base material is applied, the adhesive layer itself can be transferred to another base material.
- the release substrate is not particularly limited, but for example, a coated layer of filler such as clay, polyethylene, polypropylene, etc. is applied to both sides of paper such as woodfree paper, kraft paper, roll paper, and glassine paper. and a silicone type, fluorine type or alkyd type release agent is applied on each coating layer.
- a coated layer of filler such as clay, polyethylene, polypropylene, etc.
- paper such as woodfree paper, kraft paper, roll paper, and glassine paper.
- a silicone type, fluorine type or alkyd type release agent is applied on each coating layer.
- Other examples include various olefin films such as polyethylene, polypropylene, ethylene- ⁇ -olefin copolymer and propylene- ⁇ -olefin copolymer alone, and films such as polyethylene terephthalate coated with the release agent.
- both sides of high-quality paper are filled with polypropylene and an alkyd-based release agent is used on top of it.
- an alkyd release agent on polyethylene terephthalate.
- the method of coating the substrate with the adhesive composition in the present invention is not particularly limited, but includes a comma coater, a reverse roll coater, and the like.
- an adhesive layer can be provided directly or by a transfer method on the rolled copper foil or polyimide film, which are the constituent materials of the printed wiring board.
- the thickness of the adhesive layer after drying may be changed as required, but is preferably in the range of 5 to 200 ⁇ m. Sufficient adhesive strength can be obtained by setting the thickness of the adhesive film to 5 ⁇ m or more. Further, by setting the thickness to 200 ⁇ m or less, it becomes easier to control the amount of residual solvent in the drying process, and blisters are less likely to occur during pressing in the manufacture of printed wiring boards.
- the drying conditions are not particularly limited, but the residual solvent rate after drying is preferably 1% by mass or less. When the amount is 1% by mass or less, foaming of the residual solvent is suppressed during pressing of the printed wiring board, and blisters are less likely to occur.
- the printed wiring board in the present invention includes, as constituent elements, a laminate formed of a metal foil forming a conductive circuit and a resin base material, and examples thereof include flexible substrates, rigid substrates, package substrates, and the like.
- a printed wiring board is manufactured, for example, by a conventionally known method such as a subtractive method using a metal-clad laminate. If necessary, so-called flexible circuit boards (FPC), flat cables, tape automated bonding ( It is a general term for circuit boards for TAB).
- FPC flexible circuit boards
- 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 a printed wiring board composed of four layers: a base film layer, a metal foil layer, an adhesive layer, and a cover film layer.
- a printed wiring board can be made up of five layers: a base film layer, an adhesive layer, a metal foil layer, an adhesive layer, and a cover film layer.
- the adhesive composition of the present invention can be suitably used for each adhesive layer of printed wiring boards.
- the adhesive composition of the present invention when used as an adhesive, it has high adhesiveness not only to conventional polyimides, polyester films, and copper foils constituting printed wiring boards, but also to low-polarity resin substrates 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 coverlay films, laminates, resin-coated copper foils and bonding sheets.
- any resin film conventionally used as a base material for printed wiring boards can be used as the base film.
- resins for the base film include polyester resins, polyamide resins, polyimide resins, polyamideimide resins, liquid crystal polymers, polyphenylene sulfides, syndiotactic polystyrene, polyolefin resins, fluorine resins, and the like.
- it has excellent adhesion even to low-polarity substrates such as liquid crystal polymers, polyphenylene sulfide, syndiotactic polystyrene, and polyolefin resins.
- any insulating film conventionally known as an insulating film for printed wiring boards can be used.
- films made from various polymers such as polyimide, polyester, polyphenylene sulfide, polyethersulfone, polyetheretherketone, aramid, polycarbonate, polyarylate, polyamideimide, liquid crystal polymer, syndiotactic polystyrene, and polyolefin resin are used. It is possible. Polyimide films or liquid crystal polymer films are more preferred.
- the printed wiring board of the present invention can be manufactured using any conventionally known process except for using the materials for each layer described above.
- 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.
- a semi-finished product in which a desired circuit pattern is formed by laminating a metal foil layer on a base film layer (hereinafter referred to as a "two-layer semi-finished product on the base film side"), or a semi-finished product in which an adhesive layer is laminated on a base film layer.
- a semi-finished product having a desired circuit pattern formed by laminating a metal foil layer thereon (hereinafter referred to as “base film side 3-layer semi-finished product”) (hereinafter referred to as “base film side 2-layer semi-finished product”). Together with the base film side three-layer semi-finished product, it is referred to as the “base film side semi-finished product”).
- base film side semi-finished product By laminating the semi-finished product on the cover film side and the semi-finished product on the base film side thus obtained, a printed wiring board having four or five layers can be obtained.
- the semi-finished product on the substrate film side includes, for example, (A) a step of applying a solution of a resin that will be the substrate film to the metal foil and initially drying the coating film, and (B) the metal foil obtained in (A) and It is obtained by a production method including a process of heat-treating and drying the laminate with the initially dried coating film (hereinafter referred to as "heat-treatment/solvent removal process").
- a conventionally known method can be used to form a circuit in the metal foil layer.
- An additive method may be used, or a subtractive method may be used.
- a subtractive method is preferred.
- the semi-finished product on the base film side thus obtained may be used as it is for lamination with the semi-finished product on the cover film side. may be used.
- the semi-finished product on the cover film side is manufactured, for example, by applying an adhesive to the cover film. If desired, a cross-linking reaction in the applied adhesive can be performed. In a preferred embodiment, the adhesive layer is semi-cured.
- the semi-finished product on the cover film side thus obtained may be used as it is for bonding to the semi-finished product on the base film side. may be used for
- the semi-finished product on the base film side and the semi-finished product on the cover film side are each stored, for example, in the form of a roll, and then laminated together to manufacture a printed wiring board.
- Any method can be used as the bonding method, and for example, the bonding can be performed using a press or a roll. Also, both can be bonded together while being heated by a method such as using a hot press or a hot roll device.
- the semi-finished product on the reinforcing material side for example, in the case of a soft and windable reinforcing material such as a polyimide film, it is preferable to manufacture it by applying an adhesive to the reinforcing material.
- an adhesive to the reinforcing material.
- the adhesive applied in advance to the release base material can be transferred and applied. It is preferably manufactured. Also, if necessary, a cross-linking reaction in the applied adhesive can be carried out.
- the adhesive layer is semi-cured.
- the semi-finished product on the reinforcing material side thus obtained may be used as it is for bonding to the back surface of the printed wiring board, or it may be used for bonding to the semi-finished product on the base film side after being stored after being bonded with a release film. You may
- the semi-finished product on the base film side, the semi-finished product on the cover film side, and the semi-finished product on the reinforcing material side are all printed wiring board laminates in the present invention.
- Relative permittivity ( ⁇ c ) and dissipation factor (tan ⁇ ) Amorphous polyol dissolved in a solvent was applied to a Teflon (registered trademark) sheet having a thickness of 100 ⁇ m so that the thickness after drying was 25 ⁇ m, dried at 130° C. for 3 minutes, and then the Teflon (registered trademark) sheet was applied. It was peeled off to obtain a resin sheet for testing. The test resin sheet thus obtained was cut into strips of 8 cm ⁇ 3 mm to obtain test samples.
- the relative dielectric constant ( ⁇ c ) and dielectric loss tangent (tan ⁇ ) were measured by a cavity resonator perturbation method using a network analyzer (manufactured by Anritsu Corporation) under conditions of a temperature of 23° C. and a frequency of 10 GHz.
- the pressure in the system was reduced to 5 mmHg over 20 minutes, and the temperature was further raised to 250°C. Then, the pressure was reduced to 0.3 mmHg or less, and after the polycondensation reaction was carried out for 60 minutes, the product was taken out.
- Amorphous Polyol (b2) Amorphous polyester polyol obtained by adding 2 parts of trimellitic anhydride after polycondensation polymerization of amorphous polyol (b1) and introducing carboxyl groups at the terminals at 220°C.
- a polyol (b2) was synthesized.
- the glass transition temperature was 25° C.
- the acid value was 40 eq/10 6 g
- the dielectric loss tangent was 0.0030 (10 GHz)
- no crystalline melting peak was observed, and the film was amorphous.
- Amorphous polyol (b3) SA-90 (polyether polyol manufactured by SABIC)) has a dielectric loss tangent of 0.0066 (10 GHz), an acid value of 0 eq/10 6 g, and is amorphous.
- polycarbodiimide (A) The following was used as polycarbodiimide (A).
- epoxy resin (C) As the epoxy resin (C), the following was used. (c1): B-Tough C2x (dimer acid-modified epoxy resin manufactured by Croda) (c2): Tetrad X (glycidylamine type epoxy resin manufactured by Mitsubishi Gas Chemical Company)
- Example 1 The amorphous polyol (b1) obtained in the above synthesis example was dissolved in toluene to prepare a toluene varnish having a solid concentration of 40% by mass. Polycarbodiimide (a1) was blended with this toluene varnish in an amount of 3 parts per 100 parts of amorphous polyol (b1) to obtain an adhesive composition (S1). The resulting adhesive composition (S1) was evaluated for dielectric constant, dielectric loss tangent, peel strength, solder heat resistance and pot life. The results are listed in Table 1.
- Adhesive Composition (Relative permittivity ( ⁇ c ) and dielectric loss tangent (tan ⁇ ))
- the adhesive composition was applied to a Teflon (registered trademark) sheet having a thickness of 100 ⁇ m so that the thickness after drying was 25 ⁇ m, and dried at 130° C. for 3 minutes. After curing by heat treatment at 180° C. for 5 hours, the Teflon (registered trademark) sheet was peeled off to obtain an adhesive resin sheet for testing.
- the test adhesive resin sheet thus obtained was cut into strips of 8 cm ⁇ 3 mm to obtain test samples.
- the relative dielectric constant ( ⁇ c ) and dielectric loss tangent (tan ⁇ ) were measured by a cavity resonator perturbation method using a network analyzer (manufactured by Anritsu Corporation) under conditions of a temperature of 23° C. and a frequency of 10 GHz.
- the adhesive composition was applied to a 12.5 ⁇ m-thick polyimide film (manufactured by Kaneka Corporation, Apical (registered trademark)) so as to have a thickness of 25 ⁇ m after drying, and dried at 130° C. for 3 minutes.
- the adhesive film (B stage product) thus obtained was laminated to a 18 ⁇ m thick rolled copper foil (manufactured by Nippon Steel Chemical & Materials Co., Ltd., Espanex series).
- the pasting was performed by pressing the rolled copper foil so that the glossy surface of the rolled copper foil was in contact with the adhesive layer, and pressing for 280 seconds under a pressure of 2 MPa at 170°C.
- Examples 1 to 14 are excellent in dielectric properties, peel strength, solder heat resistance and pot life.
- Comparative Example 1 the carboxyl groups of the amorphous polyol (b2) and the carbodiimide bonds of the polycarbodiimide (a1) rapidly reacted after blending, resulting in gelation. Also in Comparative Examples 2 and 3, the carboxyl group and the epoxy group reacted, and the pot life was not sufficient.
- Comparative Examples 4 and 5 contain an amorphous polyol (b1) or an amorphous polyol (b3) with an acid value of 10 eq/ 10 g or less, but an amorphous polyol with an acid value of more than 10 eq/ 10 g ( Since b2) was included, the carboxyl group and the carbodiimide bond of polycarbodiimide (a1) reacted rapidly after blending, resulting in gelation.
- the polycarbodiimide (a2) contained an isocyanate group, and not only the pot life was insufficient, but also the solder heat resistance was insufficient.
- Comparative Example 8 since polycarbodiimide was not contained, curing was insufficient, and the peel strength and solder heat resistance were poor.
- the adhesive composition of the present invention is excellent in pot life, peel strength and soldering heat resistance, and has low relative permittivity and dielectric loss tangent. It is useful as an adhesive for printed wiring boards.
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Abstract
Description
すなわち、本発明は、以下の構成からなる。
(i)組成物中にイソシアネート基を有する化合物を含有しない。
(ii)組成物中に酸価が10eq/106gを超える化合物を含有しない。
[2] 10GHzにおける非晶性ポリオール(B)の誘電正接(tanδ)が0.006以下である前記[1]に記載の接着剤組成物。
[3] 非晶性ポリオール(B)がポリエステルポリオールを含有する前記[1]または[2]に記載の接着剤組成物。
[4] 非晶性ポリオール(B)100質量部に対し、0.1~10質量部のエポキシ樹脂(C)を含有する前記[1]~[3]に記載の接着剤組成物。
[5] 前記[1]~[4]に記載の接着剤組成物からなる接着剤層を有する接着シート。
[6] 前記[1]~[4]に記載の接着剤組成物からなる接着剤層を有する積層体。
[7] 前記[6]に記載の積層体を構成要素として含むプリント配線板。
本発明の接着剤組成物はポリカルボジイミド(A)および非晶性ポリオール(B)を含有し、以下の(i)および(ii)を満足する。
(i)組成物中にイソシアネート基を有する化合物を含有しない。
(ii)組成物中に酸価が10eq/106gを超える化合物を含有しない。
本発明の接着剤組成物は、イソシアネート基を有する化合物を含有しない。イソシアネート基を有する化合物とは、汎用のイソシアネート硬化剤などのイソシアネート化合物のほか、イソシアネート基を有するポリカルボジイミド、イソシアネート基を有するポリオールも意味する。本発明の接着剤組成物はイソシアネート基を有する化合物がなくとも熱硬化できるため、これらを含有しないことで低温で反応する非晶性ポリオールの水酸基とイソシアネート基との反応や、イソシアネート基と水分との反応が起こらないため、ポットライフを向上させることができる。
本発明の接着剤組成物は、酸価が10eq/106gを超える化合物を含有しない。酸価を上記範囲内とすることで、低温で反応するカルボキシル基とカルボジイミド結合との反応を防止し、ポットライフを向上させることができる。ここで、接着剤組成物が酸価が10eq/106gを超える化合物を含有しないとは、ポリカルボジイミド(A)および非晶性ポリオール(B)も酸価が10eq/106gを超えないことを意味する。
本発明で用いるポリカルボジイミド(A)は、分子内にカルボジイミド結合を2個以上有するものであり、イソシアネート基を有さず、酸価が10eq/106gを超えないものであれば特に限定されない。ポリカルボジイミド(A)を使用することによって、非晶性ポリオール(B)の水酸基とカルボジイミド結合とを熱硬化させることで、耐熱性や接着性を向上することができる。
本発明で用いる非晶性ポリオール(B)としては、分子中に2個以上の水酸基を有し、イソシアネート基を有さず、酸価が10eq/106g以下であれば、特に限定されない。非晶性ポリオール(B)はポットライフの観点から、非晶性であることが必要である。非晶性ポリオール(B)としては、例えば、ポリエステルポリオール、ポリウレタンポリオール、ポリエーテルポリオール、ポリカーボネートポリオールおよびポリオレフィンポリオール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、ポリエステルポリオールである。可撓性に優れるポリエステルポリオールを使用することで、接着性とはんだ耐熱性とを両立することができる。
本発明におけるポリエステルポリオールは、多価カルボン酸成分と多価アルコール成分との重縮合物によって得られる化学構造からなり、多価カルボン酸成分と多価アルコール成分とはそれぞれ1種または2種以上の選択された成分からなるものである。
本発明の接着剤組成物はエポキシ樹脂(C)を含有することができる。本発明で用いるエポキシ樹脂(C)としては、分子中にエポキシ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個以上のエポキシ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、ダイマー酸変性エポキシ、およびエポキシ変性ポリブタジエ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。優れた接着性を発現させることができることから、好ましくは、N,N,N’,N’-テトラグリシジル-m-キシレンジアミン、ビフェニル型エポキシ樹脂、ノボラック型エポキシ樹脂、ジシクロペンタジエン型エポキシ樹脂、ダイマー酸変性エポキシ、またはエポキシ変性ポリブタジエンである。より好ましくは、N,N,N’,N’-テトラグリシジル-m-キシレンジアミンである。。
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。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。難燃剤を含有させる場合、非晶性ポリオール(B)とポリカルボジイミド(A)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。前記範囲内とすることで接着性、はんだ耐熱性および電気特性を維持しつつ、難燃性を発現することができる。
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。粘着付与剤を含有させる場合、非晶性ポリオール(B)とポリカルボジイミド(A)の合計100質量部に対し、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。前記範囲内とすることで接着性、はんだ耐熱性および電気特性を維持しつつ、粘着付与剤の効果を発現することができる。
本発明の接着剤組成物には必要に応じてフィラーを配合しても良い。有機フィラーとしては、耐熱性樹脂であるポリイミド、ポリアミドイミド、フッ素樹脂、液晶ポリエステルなどの粉末が挙げられる。また、無機フィラーとしては、例えば、シリカ(SiO2)、アルミナ(Al2O3)、チタニア(TiO2)、酸化タンタル(Ta2O5)、ジルコニア(ZrO2)、窒化硅素(Si3N4)、窒化ホウ素(BN)、炭酸カルシウム(CaCO3)、硫酸カルシウム(CaSO4)、酸化亜鉛(ZnO)、チタン酸マグネシウム(MgO・TiO2)、硫酸バリウム(BaSO4)、有機ベントナイト、クレー、マイカ、水酸化アルミニウム、水酸化マグネシウムなどが挙げられ、この中では分散の容易さや耐熱性向上効果からシリカが好ましい。
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、エポキシ基を有するもの、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エポキシ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を配合する場合、その配合量は非晶性ポリオール(B)とポリカルボジイミド(A)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。前記範囲内とすることではんだ耐熱性や接着性を向上することができる。
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り、例えばフレキシブル基板、リジッド基板、パッケージ基板などがある。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。
ロセスを用いて製造することができる。
(非晶性ポリオールの組成の測定)
400MHzの1H-核磁気共鳴スペクトル装置(以下、NMRと略記することがある)を用い、非晶性ポリオールを構成する構成単位のモル比定量を行った。溶媒には重クロロホルムを使用した。
示差走査型熱量計(SII社、DSC-200)を用いて測定した。試料(非晶性ポリオール)5mgをアルミニウム抑え蓋型容器に入れ密封し、液体窒素を用いて-50℃まで冷却した。次いで150℃まで20℃/分の昇温速度にて昇温させ、昇温過程にて得られる吸熱曲線において、吸熱ピークが出る前(ガラス転移温度以下)のベースラインの延長線と、吸熱ピークに向かう接線(ピークの立ち上がり部分からピークの頂点までの間での最大傾斜を示す接線)との交点の温度をもって、ガラス転移温度(単位:℃)とした。
前記のガラス転移温度の測定と同様の条件で得られる吸熱曲線において、ガラス転移温度が観測された後に、結晶融解による吸熱ピークを示さないものを非晶性であるとした。
非晶性ポリオールの試料0.2gを40mlのクロロホルムに溶解し、0.01Nの水酸化カリウムエタノール溶液で滴定し、カルボキシル基含有樹脂106gあたりの当量(eq/106g)を求めた。指示薬にはフェノールフタレインを用いた。
溶剤に溶解した非晶性ポリオールを厚さ100μmのテフロン(登録商標)シートに、乾燥後の厚みが25μmとなるように塗布し、130℃で3分乾燥した後、テフロン(登録商標)シートを剥離して試験用の樹脂シートを得た。その後得られた試験用樹脂シートを8cm×3mmの短冊状にサンプルを裁断し、試験用サンプルを得た。比誘電率(εc)及び誘電正接(tanδ)は、ネットワークアナライザー(アンリツ社製)を使用し、空洞共振器摂動法で、温度23℃、周波数10GHzの条件で測定した。
攪拌機、コンデンサー、温度計を具備した反応容器にナフタレンジカルボン酸ジメチル275部、トリメリット酸無水物5部、ダイマージオール264部、トリシクロデカンジメタノール125部、エチレングリコール76部、触媒としてオルトチタン酸テトラブチルを全酸成分に対して0.03モル%仕込み、160℃から220℃まで4時間かけて昇温、脱水工程を経ながらエステル化反応を行った。次に重縮合反応工程は、系内を20分かけて5mmHgまで減圧し、さらに250℃まで昇温を進めた。次いで、0.3mmHg以下まで減圧し、60分間の重縮合反応を行った後、これを取り出した。得られた非晶性ポリオール(a1)はNMRによる組成分析の結果、モル比でナフタレンジカルボン酸/トリメリット酸無水物/ダイマージオール/トリシクロデカンジメタノール/エチレングリコール=97/3/40/55/5のポリエステルポリオールであった。また、ガラス転移温度は17℃、酸価は3eq/106g、誘電正接は0.0035(10GHz)であり、結晶融解ピークは観測されず、非晶性であった。
非晶性ポリオール(b1)の重縮合重合後、トリメリット酸無水物2部を加え、220℃で末端にカルボキシル基を導入したポリエステルポリオールである非晶性ポリオール(b2)を合成した。ガラス転移温度は25℃、酸価は40eq/106g、誘電正接は0.0030(10GHz)であり、結晶融解ピークは観測されず、非晶性であった。
非晶性ポリオール(b3):SA-90(SABIC社製ポリエーテルポリオール))誘電正接は0.0066(10GHz)、酸価は0eq/106gであり、非晶性である。
(a1):V-03((日清紡ケミカル社製ポリカルボジイミド、イソシアネート基含有量0重量%)
(a2):V-05((日清紡ケミカル社製ポリカルボジイミド、イソシアネート基含有量8.2重量%)
(c1):B-Tough C2x(Croda社製ダイマー酸変性エポキシ樹脂)
(c2):テトラッドX(三菱ガス化学社製グリシジルアミン型エポキシ樹脂)
前記の合成例で得た非晶性ポリオール(b1)をトルエンで溶解し、固形分濃度40質量%のトルエンワニスを作成した。このトルエンワニスに、ポリカルボジイミド(a1)を、非晶性ポリオール(b1)100部に対し3部となるように配合し、接着剤組成物(S1)を得た。
得られた接着剤組成物(S1)について、比誘電率、誘電正接、ピール強度、はんだ耐熱性およびポットライフの各評価を実施した。結果を表1に記載した。
非晶性ポリオール(B)の種類、ならびにポリカルボジイミド(A)、エポキシ樹脂(C)の種類および配合量を表1に示すように変更した以外は実施例1と同様に接着剤組成物(S2)~(S22)を作成し、各評価を実施した。結果を表1に記載した。
(比誘電率(εc)及び誘電正接(tanδ))
接着剤組成物を厚さ100μmのテフロン(登録商標)シートに、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180℃で5時間熱処理して硬化させた後、テフロン(登録商標)シートを剥離して試験用の接着剤樹脂シートを得た。その後得られた試験用接着剤樹脂シートを8cm×3mmの短冊状にサンプルを裁断し、試験用サンプルを得た。比誘電率(εc)及び誘電正接(tanδ)は、ネットワークアナライザー(アンリツ社製)を使用し、空洞共振器摂動法で、温度23℃、周波数10GHzの条件で測定した。
<比誘電率の評価基準>
○:3.0以下
×:3.0を超える
<誘電正接の評価基準>
○:0.004未満
△:0.004以上0.006以下
×:0.006を超える
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))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)を厚さ18μmの圧延銅箔(日鉄ケミカル&マテリアル株式会社製、エスパネックスシリーズ)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層と接する様にして、170℃で2MPaの加圧下に280秒間プレスし、接着した。次いで180℃で5時間熱処理して硬化させ、ピール強度評価用サンプルを得た。ピール強度は、25℃、フィルム引き、引張速度50mm/min、90°剥離の条件で測定した。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
○:0.7N/mm以上1.0N/mm未満
△:0.5N/mm以上0.7N/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288℃で溶融したはんだ浴に浸漬し、膨れなどの外観変化の有無を確認した。
<評価基準>
◎:60秒以上膨れ無し
○:30秒以上60秒未満で膨れ有り
△:10秒以上30秒未満で膨れ有り
×:10秒未満で膨れ有り
溶液状態の接着剤組成物を25℃で静置し、溶液がゲル化するまでの日数を確認した。
<評価基準>
○:配合後7日以上ゲル化しない
△:配合後1日以上7日未満でゲル化
×:配合後1日未満でゲル化
Claims (7)
- ポリカルボジイミド(A)および非晶性ポリオール(B)を含有し、かつ下記の(i)および(ii)を満足する接着剤組成物。
(i)組成物中にイソシアネート基を有する化合物を含有しない。
(ii)組成物中に酸価が10eq/106gを超える化合物を含有しない。 - 10GHzにおける非晶性ポリオール(B)の誘電正接(tanδ)が0.006以下である請求項1に記載の接着剤組成物。
- 非晶性ポリオール(B)がポリエステルポリオールを含有する請求項1または2に記載の接着剤組成物。
- 非晶性ポリオール(B)100質量部に対し、0.1~10質量部のエポキシ樹脂(C)を含有する請求項1~3のいずれかに記載の接着剤組成物。
- 請求項1~4のいずれかに記載の接着剤組成物からなる接着剤層を有する接着シート。
- 請求項1~4のいずれかに記載の接着剤組成物からなる接着剤層を有する積層体。
- 請求項6に記載の積層体を構成要素として含むプリント配線板。
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JP2007204562A (ja) * | 2006-01-31 | 2007-08-16 | Sumitomo Bakelite Co Ltd | 樹脂組成物及び樹脂組成物を使用して作製した半導体装置 |
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WO2020218174A1 (ja) * | 2019-04-23 | 2020-10-29 | 三菱ケミカル株式会社 | 粘着剤および粘着シート |
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CN107075335B (zh) | 2014-09-24 | 2020-02-14 | 东亚合成株式会社 | 粘接剂组合物和使用了其的带有粘接剂层的层叠体 |
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JP2007204562A (ja) * | 2006-01-31 | 2007-08-16 | Sumitomo Bakelite Co Ltd | 樹脂組成物及び樹脂組成物を使用して作製した半導体装置 |
JP2012131967A (ja) * | 2010-11-30 | 2012-07-12 | Toyo Ink Sc Holdings Co Ltd | カルボキシル基含有変性エステル樹脂を含む熱硬化性樹脂組成物 |
JP2013075972A (ja) * | 2011-09-30 | 2013-04-25 | Toyobo Co Ltd | ポリエステル−ポリカルボジイミド共重合体樹脂組成物 |
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