WO2021181732A1 - Curable adhesive sheet for device - Google Patents
Curable adhesive sheet for device Download PDFInfo
- Publication number
- WO2021181732A1 WO2021181732A1 PCT/JP2020/036884 JP2020036884W WO2021181732A1 WO 2021181732 A1 WO2021181732 A1 WO 2021181732A1 JP 2020036884 W JP2020036884 W JP 2020036884W WO 2021181732 A1 WO2021181732 A1 WO 2021181732A1
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- WO
- WIPO (PCT)
- Prior art keywords
- adhesive layer
- group
- compound
- adhesive sheet
- curable adhesive
- Prior art date
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- 0 C*(C)Oc1ccc(C)cc1 Chemical compound C*(C)Oc1ccc(C)cc1 0.000 description 2
Classifications
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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
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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
- C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J171/00—Adhesives based on polyethers obtained by reactions forming an ether link in the main chain; Adhesives based on derivatives of such polymers
- C09J171/08—Polyethers derived from hydroxy compounds or from their metallic derivatives
- C09J171/10—Polyethers derived from hydroxy compounds or from their metallic derivatives from phenols
- C09J171/12—Polyphenylene oxides
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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
- C09J181/00—Adhesives based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing sulfur, with or without nitrogen, oxygen, or carbon only; Adhesives based on polysulfones; Adhesives based on derivatives of such polymers
- C09J181/02—Polythioethers; Polythioether-ethers
-
- 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
- C09J4/00—Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
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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
- C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
- C09J7/35—Heat-activated
Definitions
- the present invention relates to a curable adhesive sheet for a device having an adhesive layer that gives a cured product having excellent low dielectric properties in a high frequency region.
- the high frequency region refers to a region of 300 MHz to 300 GHz.
- FPC flexible printed wiring boards
- FPC can be obtained, for example, by forming an electric circuit by performing an etching treatment on a copper foil obtained by laminating a copper foil on an insulating resin film such as polyimide (copper-clad laminate). Further, usually, a coverlay film having an insulating resin base material and an adhesive layer is attached to a copper foil on which an electric circuit is formed to protect the electric circuit.
- the dielectric properties of the insulators (base materials, adhesives, etc.) that make up the wiring members have been improved (lower dielectric constant and lower dielectric constant). It has been done to make it a direct connection).
- Patent Document 1 describes a laminate with an adhesive layer including a base film and an adhesive layer on at least one surface of the base film, wherein the adhesive layer comprises a specific adhesive composition. A laminate with an adhesive layer is described. Patent Document 1 also describes that the laminate with an adhesive layer is excellent in electrical characteristics (low dielectric constant, low dielectric loss tangent) and the like.
- the cured product of the adhesive composition described in Patent Document 1 has low dielectric properties (in the present specification, "low dielectric properties” means “low dielectric constant and low dielectric loss tangent”). ..
- low dielectric properties means “low dielectric constant and low dielectric loss tangent”
- the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a curable adhesive sheet for a device having an adhesive layer that gives a cured product having excellent low dielectric properties in a high frequency region.
- the present inventors have diligently studied a curable adhesive sheet for devices having an adhesive layer.
- a curable adhesive sheet for devices having an adhesive layer As a result, by using a polyphenylene ether resin having a vinyl group and a compound having two or more hydrocarbon groups having a double bond at the terminal, an adhesive layer that gives a cured product having excellent low dielectric properties in a high frequency region is formed.
- the component (B) is a compound having a heterocyclic skeleton.
- R represents a saturated hydrocarbon group having 5 to 15 carbon atoms.
- the adhesive layer is a layer containing a compound having a cyclic ether group or a layer not containing a compound having a cyclic ether group and having a cyclic ether group.
- the adhesive layer is a layer containing a liquid compound at 25 ° C., and the content of the liquid compound at 25 ° C. is 5% by mass or more in the adhesive layer [1] to [ 10]
- the curable adhesive sheet for a device according to any one of.
- a curable adhesive sheet for a device having an adhesive layer that gives a cured product having excellent low dielectric properties in a high frequency region.
- the curable adhesive sheet for a device of the present invention has an adhesive layer containing the following components (A) and (B).
- Component A compound having two or more hydrocarbon groups having a double bond at the terminal.
- the adhesive layer of the curable adhesive sheet for devices of the present invention contains a polyphenylene ether resin having a vinyl group (hereinafter, may be referred to as "polyphenylene ether resin (A)") as a component (A).
- the polyphenylene ether resin refers to a resin having a polyphenylene skeleton in the main chain.
- the polyphenylene skeleton is the following formula
- the cured product of the adhesive layer containing the polyphenylene ether resin (A) is excellent in low dielectric properties.
- Examples of the polyphenylene ether skeleton in the polyphenylene ether resin (A) include those represented by the following formula (1).
- X is a divalent group represented by the following formula (2) or the formula (3)
- Y is a divalent group represented by the following formula (4) independently.
- the group, a and b are integers from 0 to 100, and at least one of a and b is 1 or more. * Represents a bond (hereinafter the same).
- R 1 to R 8 independently represent a hydrogen atom, a halogen atom, an alkyl group having 6 or less carbon atoms, or a phenyl group, and are preferably a hydrogen atom or a methyl group.
- R 9 to R 16 independently represent a hydrogen atom, a halogen atom, an alkyl group having 6 or less carbon atoms, or a phenyl group, and are preferably a hydrogen atom or a methyl group.
- A represents a linear, branched, or cyclic divalent hydrocarbon group having 20 or less carbon atoms.
- R 17 to R 20 independently represent a hydrogen atom, a halogen atom, an alkyl group having 6 or less carbon atoms, or a phenyl group, and are preferably a hydrogen atom or a methyl group.
- Examples of the polyphenylene ether skeleton in the polyphenylene ether resin (A) include those represented by the following formula (5).
- the cured product of the adhesive layer containing the polyphenylene ether resin (A) is excellent in low dielectric properties, crosslinkability and heat resistance.
- the vinyl group in the polyphenylene ether resin (A) may form a part of a hydrocarbon-based substituent, such as a vinylbenzyl group and a vinylnaphthyl group. That is, the polyphenylene ether resin (A) is formed by bonding a vinyl group or a vinyl group-containing hydrocarbon group to the polyphenylene ether skeleton.
- polyphenylene ether resin (A) one having a vinyl group or a vinyl group-containing hydrocarbon group at both ends of the polyphenylene ether skeleton is preferable because a cured product having excellent low dielectric properties can be easily obtained.
- Such a polyphenylene ether resin (A) can be obtained by forming a polyphenylene ether skeleton and then introducing a vinyl group or a vinyl group-containing hydrocarbon group at both ends. Specifically, a bifunctional phenol compound and a monofunctional phenol compound are reacted to obtain a polymer having phenolic hydroxyl groups at both ends, and then 4- (chloromethyl) styrene is used to change the terminal phenolic hydroxyl groups to vinyl. By benzyl etherification, a polyphenylene ether resin (A) having vinylbenzyl groups at both ends of the polyphenylene ether skeleton can be obtained.
- polyphenylene ether resin (A) examples include those represented by the following formula (6).
- polyphenylene ether resin (A) As the polyphenylene ether resin (A), a commercially available product can also be used. Examples of commercially available products include OPE-2St (modified polyphenylene ether resin having vinylbenzyl groups at both ends) manufactured by Mitsubishi Gas Chemical Company.
- the weight average molecular weight (Mw) of the polyphenylene ether resin (A) is preferably 500 to 5,000, more preferably 500 to 3,000.
- the weight average molecular weight (Mw) of the polyphenylene ether resin (A) can be determined as a standard polystyrene-equivalent value by performing gel permeation chromatography (GPC) using tetrahydrofuran (THF) as a solvent.
- the polyphenylene ether resin (A) can be used alone or in combination of two or more.
- the content of the polyphenylene ether resin (A) is preferably 10% by mass or more, more preferably 15 to 50% by mass in the adhesive layer.
- the content of the polyphenylene ether resin (A) may be 10 to 40% by mass in the adhesive layer when the content of the binder resin described later is large.
- the content of the polyphenylene ether resin (A) is 10% by mass or more in the adhesive layer, it becomes easy to obtain a cured product having excellent low dielectric properties while improving the curability of the adhesive layer.
- the adhesive layer of the curable adhesive sheet for devices of the present invention is a compound having two or more hydrocarbon groups having a double bond at the terminal as the component (B) (hereinafter referred to as "polyfunctional compound (B)"). There is.).
- the cured product of the adhesive layer containing the polyfunctional compound (B) has low dielectric properties, crosslinkability and adhesion. Excellent in strength.
- the hydrocarbon group having a double bond at the terminal has preferably 2 to 10 carbon atoms, more preferably 2 to 5 carbon atoms.
- Hydrocarbon groups having a double bond at the terminal include a vinyl group, an allyl group, a 3-butenyl group, a 4-pentenyl group, a 5-hexenyl group, an isopropenyl group, a 1-methyl-2-propenyl group, and a vinylbenzyl group. , Vinyl naphthyl group and the like. Among these, an allyl group is preferable.
- the number of hydrocarbon groups having a double bond at the terminal contained in the polyfunctional compound (B) is 2 or more.
- a crosslinked structure is formed in the cured product, and a cured product having better adhesive strength and heat resistance can be formed.
- the number of hydrocarbon groups having double bonds at the ends is increased from the viewpoint of suppressing the occurrence of cracks in the adhesive layer after curing.
- the number of hydrocarbon groups having a double bond at the terminal is 2, the amount of the polyfunctional compound (B) blended is large while exhibiting the curability of the polyfunctional compound (B).
- the curing shrinkage of the adhesive layer can be suppressed, and when the curable adhesive sheet for a device is used for adhering a plate-shaped member such as a circuit board, the warp of the plate-shaped member can be reduced.
- the double bond of a hydrocarbon group having a double bond at the terminal is polymerized, the distance between the monomers before the polymerization (that is, the distance between the double bonds indicated by the Van der Waals distance) is increased between the repeating units by the polymerization.
- the curing shrinkage of the curable adhesive layer tends to increase.
- the polyfunctional compound (B) preferably has a heterocyclic skeleton. Since the polyfunctional compound (B) has a heterocyclic skeleton, it becomes easy to obtain a cured product having excellent adhesive strength and low dielectric properties.
- the heterocyclic skeleton include an isocyanurate skeleton and a glycoluril skeleton.
- Examples of the polyfunctional compound (B) having an isocyanurate skeleton include a compound represented by the following formula (7) or (8).
- R 21 and R 22 each independently represent a hydrocarbon group having a double bond at the terminal
- R 23 is a saturated hydrocarbon group having 1 to 15 carbon atoms and 1 to 15 carbon atoms. Represents an alkoxy group-substituted alkyl group.
- R 24 to R 26 each independently represent a hydrocarbon group having a double bond at the end.
- hydrocarbon groups having a double bond at the ends represented by R 21 , R 22 , R 24 , R 25 , and R 26 are as described above.
- the saturated hydrocarbon group represented by R 23 has 1 to 15 carbon atoms, preferably 5 to 15 carbon atoms, and more preferably 8 to 15 carbon atoms.
- Examples of the saturated hydrocarbon group represented by R 23 include a methyl group, an ethyl group, an n-propyl group, an isopropyl group, an n-butyl group, a t-butyl group, an s-butyl group, an isobutyl group and an n-pentyl group.
- n-hexyl group, n-heptyl group, n-octyl group, n-nonyl group, n-decyl group, n-undecyl group, n-dodecyl group, n-tridecyl group, n-tetradecyl group, n-pentadecyl group, etc. Can be mentioned.
- the alkoxy group-substituted alkyl group represented by R 23 has 2 to 15 carbon atoms, preferably 2 to 12 and more preferably 3 to 10.
- Examples of the alkoxy group-substituted alkyl group represented by R 23 include a methoxymethyl group, an ethoxymethyl group, a 2-methoxyethoxymethyl group, a benzyloxymethyl group and the like.
- Examples of the polyfunctional compound (B) having a glycoluril skeleton include a compound represented by the following formula (9).
- R 27 to R 30 each independently represent a hydrocarbon group having 1 to 15 carbon atoms, and at least two of these are hydrocarbon groups having a double bond at the terminal.
- R 31 and R 32 represent a hydrogen atom or a saturated hydrocarbon group having 1 to 15 carbon atoms.
- a compound having an isocyanurate skeleton is preferable as the polyfunctional compound (B), and a compound represented by the formula (7) is more preferable, because a cured product having an appropriate crosslink density can be easily obtained.
- the compound represented by the following formula is more preferable.
- R represents a saturated hydrocarbon group having 5 to 15 carbon atoms, and a saturated hydrocarbon group having 8 to 15 carbon atoms is preferable.
- examples of the compound represented by the formula (7) include L-DAIC (manufactured by Shikoku Chemicals Corporation).
- examples of the compound represented by the formula (8) include TAIC (manufactured by Mitsubishi Chemical Corporation).
- Examples of the compound represented by the formula (9) include TA-G (manufactured by Shikoku Chemicals Corporation).
- the molecular weight of the polyfunctional compound (B) is preferably 1,000 or less, more preferably 800 or less, and even more preferably 500 or less.
- the polyfunctional compound (B) having a molecular weight of 1,000 or less tends to satisfy the requirement of being a liquid at 25 ° C.
- the adhesive layer has improved adhesiveness at room temperature.
- “Liquid at 25 ° C” means having fluidity at 25 ° C.
- a compound that is liquid at 25 ° C. is a compound having a viscosity of 2 to 10000 mPa ⁇ s measured at 25 ° C. and 1.0 rpm using an E-type viscometer.
- the molecular weight of the polyfunctional compound (B) is preferably 100 or more, more preferably 200 or more, and even more preferably 275 or more.
- the polyfunctional compound (B) having a high molecular weight has the desired physical properties because the drying step when forming the adhesive layer and the step of curing the adhesive layer are difficult to volatilize even in the thermosetting step. A cured product can be easily obtained.
- the boiling point of the polyfunctional compound (B) is preferably 175 to 350 ° C, more preferably 200 to 300 ° C.
- the 5% weight loss temperature of the polyfunctional compound (B) is preferably 175 to 350 ° C, more preferably 200 to 300 ° C.
- the polyfunctional compound (B) can be used alone or in combination of two or more.
- the content of the polyfunctional compound (B) is preferably 5% by mass or more, more preferably 6 to 50% by mass, and further preferably 10 to 30% by mass in the adhesive layer.
- the content of the polyfunctional compound (B) may be 6 to 30% by mass in the adhesive layer when the content of the binder resin described later is large.
- the content of the polyfunctional compound (B) is 5% by mass or more in the adhesive layer, a cured product having excellent adhesive strength and low dielectric properties can be easily obtained.
- the adhesive layer contains a compound that is liquid at 25 ° C., but the compound that is liquid at 25 ° C. is polyfunctional. It is preferably the sex compound (B). That is, it is considered that a compound having a cyclic ether group and liquid at 25 ° C. is also effective in terms of improving the adhesiveness of the adhesive layer at room temperature and promoting the curing reaction. However, if a compound having a cyclic ether group is used, it may be difficult to obtain a cured product having excellent low dielectric properties.
- the polyfunctional compound (B) has a large content in the adhesive layer because the hydrocarbon group having a double bond is involved in the curing reaction, unlike the case where the compound having a cyclic ether group is used. Also tends to maintain the low dielectric properties of the cured product. Therefore, if the polyfunctional compound (B) is liquid at 25 ° C., the adhesive layer can contain the compound liquid at 25 ° C. in a suitable amount without impairing the low dielectric property of the cured product. Therefore, the content of the polyfunctional compound (B), which is liquid at 25 ° C., is preferably 5% by mass or more, more preferably 6 to 50% by mass, and 10 to 30% by mass in the adhesive layer. It is more preferably mass%. The content of the polyfunctional compound (B), which is liquid at 25 ° C., may be 6 to 30% by mass in the adhesive layer when the content of the binder resin described later is large.
- the adhesive layer of the curable adhesive sheet for devices of the present invention may contain a binder resin as the component (C).
- the adhesive layer of the curable adhesive sheet for devices of the present invention may contain a liquid compound at 25 ° C. In such a case, the adhesive layer containing the binder resin makes it easier to maintain the shape of the adhesive layer.
- the binder resin is not particularly limited as long as it is a polymer component that imparts film-forming property and flexibility to the adhesive layer.
- Binder resins include olefin resins, acrylic polymers, polyester resins, polyvinyl alcohol resins, polyvinyl butyral, polyvinyl chloride, phenoxy resins, polyamide resins, cellulose-based materials, polyvinyl ethers, polyimide resins, and styrene-isoprene-styrene blocks. Examples thereof include polymers, styrene-butadiene-styrene block copolymers and the like.
- an olefin resin is preferable because a cured product having excellent low dielectric properties can be easily obtained.
- the olefin-based resin refers to a polymer containing a repeating unit derived from an olefin-based monomer.
- the olefin-based resin may be a polymer consisting of only repeating units derived from the olefin-based monomer, or the repeating units derived from the olefin-based monomer and a monomer copolymerizable with the olefin-based monomer.
- a polymer composed of repeating units derived from the same may be used, but from the viewpoint that a cured product having excellent low dielectric properties can be easily obtained, a polymer consisting only of repeating units derived from an olefin-based monomer is preferable. ..
- olefin-based monomer ⁇ -olefin having 2 to 8 carbon atoms is preferable, ethylene, propylene, 1-butene, isobutylene, or 1-hexene is more preferable, and ethylene or propylene is further preferable.
- These olefin-based monomers may be used alone or in combination of two or more.
- the monomer copolymerizable with the olefin-based monomer include vinyl acetate, (meth) acrylic acid ester, and styrene.
- (meth) acrylic acid means acrylic acid or methacrylic acid (the same shall apply hereinafter).
- monomer copolymerizable with these olefin-based monomers one type can be used alone, or two or more types can be used in combination.
- olefin resins include ultra-low density polyethylene (VLDPE), low density polyethylene (LDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), linear low density polyethylene, polypropylene (PP), and ethylene-propylene.
- VLDPE ultra-low density polyethylene
- LDPE low density polyethylene
- MDPE medium density polyethylene
- HDPE high density polyethylene
- PP polypropylene
- ethylene-propylene examples thereof include a copolymer, an olefin-based elastomer (TPO), an ethylene-vinyl acetate copolymer (EVA), an ethylene- (meth) acrylic acid copolymer, and an ethylene- (meth) acrylic acid ester copolymer.
- a resin having a reactive functional group is preferable.
- a crosslinked structure in which the binder resin is involved can be constructed in the cured product of the adhesive layer, and a cured product having excellent heat resistance can be formed.
- a resin having a reactive functional group as a binder resin, a cured product having sufficient adhesive strength can be formed even on a poorly adhesive base material or the like.
- Reactive functional groups include carboxyl groups, carboxylic acid anhydride groups, carboxylic acid ester groups, hydroxyl groups, epoxy groups, amide groups, ammonium groups, nitrile groups, amino groups, imide groups, isocyanate groups, acetyl groups and thiol groups.
- Examples thereof include an ether group, a thioether group, a sulfone group, a phosphone group, a nitro group, a urethane group, an alkoxysilyl group, a silanol group and a halogen atom.
- Examples of the resin having a reactive functional group include a modified polyolefin resin described later, a phenoxy resin and a cellulose-based material among the above-mentioned binder resins, and a resin other than the olefin-based resin among the above-mentioned binder resins. Modified products and the like can be mentioned.
- a modified polyolefin resin is preferable as the binder resin because it is easy to obtain a cured product having excellent low dielectric properties and because it is easy to obtain a cured product having excellent heat resistance.
- the modified polyolefin resin is an olefin resin having a reactive functional group introduced therein, which is obtained by subjecting an olefin resin as a precursor to a modification treatment using a modifier (a compound having a functional group in the molecule). be.
- an acid-modified polyolefin resin is preferable because a cured product having a higher adhesive strength is formed.
- the acid-modified polyolefin resin refers to an olefin-based resin graft-modified with an acid or an acid anhydride.
- an unsaturated carboxylic acid or an unsaturated carboxylic acid anhydride (hereinafter, may be referred to as “unsaturated carboxylic acid or the like”) is reacted with an olefin resin to introduce a carboxyl group or a carboxylic acid anhydride group (hereinafter, it may be referred to as “unsaturated carboxylic acid or the like”).
- Those that have been graft-modified can be mentioned.
- Examples of the unsaturated carboxylic acid to be reacted with the olefin resin include unsaturated carboxylic acids such as maleic acid, fumaric acid, itaconic acid, citraconic acid, glutaconic acid, tetrahydrophthalic acid and aconitic acid; maleic anhydride, itaconic anhydride, etc.
- unsaturated carboxylic acid anhydrides such as glutaconic acid anhydride, citraconic acid anhydride, aconitic acid anhydride, norbornene dicarboxylic acid anhydride, and tetrahydrophthalic acid anhydride; can be mentioned. These can be used alone or in combination of two or more. Among these, maleic anhydride is preferable because a cured product having better adhesive strength can be easily obtained.
- the amount of unsaturated carboxylic acid or the like to be reacted with the olefin resin is preferably 0.1 to 5 parts by mass, more preferably 0.2 to 3 parts by mass, and further preferably 0 with respect to 100 parts by mass of the olefin resin. .2 to 1 part by mass.
- the method for introducing the unsaturated carboxylic acid unit or the unsaturated carboxylic acid anhydride unit into the olefin resin is not particularly limited.
- a radical generator such as an organic peroxide or an azonitrile, or an olefin.
- the unsaturated carboxylic acid or the like is graft-copolymerized with the olefin resin by a method of heating, stirring and reacting in the presence of a radical generator.
- the method can be mentioned.
- the acid-modified polyolefin resin a commercially available product can also be used.
- commercially available products include Admer (registered trademark) (manufactured by Mitsui Chemicals), Unistor (registered trademark) (manufactured by Mitsui Chemicals), BondyRam (manufactured by Polyram), orevac (registered trademark) (manufactured by ARKEMA), and the like.
- Modic registered trademark
- Mitsubishi Chemical Corporation Mitsubishi Chemical Corporation
- the number average molecular weight (Mn) of the binder resin is preferably 10,000 to 150,000, more preferably 30,000 to 100,000.
- the number average molecular weight (Mn) of the binder resin can be determined as a standard polystyrene-equivalent value by performing gel permeation chromatography (GPC) using tetrahydrofuran (THF) as a solvent.
- the binder resin one type can be used alone, or two or more types can be used in combination.
- the content of the binder resin is preferably 40 to 80% by mass, more preferably 45 to 80% by mass in the adhesive layer.
- the content of the binder resin is 40 to 80% by mass in the adhesive layer, it becomes easy to obtain an adhesive layer having both shape retention and tackiness.
- the adhesive layer of the curable adhesive sheet for devices of the present invention may contain a cationic polymerization initiator as the component (D).
- the cationic polymerization initiator is preferable because it can efficiently proceed with the polymerization reaction of the components (A) and (B) and can improve the storage stability of the adhesive layer as compared with other curing agents.
- Examples of the cationic polymerization initiator include a thermal cationic polymerization initiator and a photocationic polymerization initiator, and a thermal cationic polymerization initiator that can be polymerized by a simple step is preferable.
- the thermal cationic polymerization initiator is a compound capable of generating a cationic species that initiates polymerization by heating.
- Examples of the thermal cationic polymerization initiator include sulnifoam salt, quaternary ammonium salt, phosphonium salt, diazonium salt, iodonium salt and the like.
- sulfonium salt examples include triphenylsulfonium tetrafluoroborate, triphenylsulfonium hexafluoroantimonate, triphenylsulfonium hexafluoroalcinate, tris (4-methoxyphenyl) sulfonium hexafluoroalcinate, and diphenyl (4-phenylthiophenyl) sulfonium. Hexafluoroalcinate and the like can be mentioned.
- a commercially available product can also be used as the sulfonium salt.
- Commercially available products include Adeka Opton SP-150, Adeka Opton SP-170, Adeka Opton CP-66, Adeka Opton CP-77 (above, manufactured by Adeka), Sun Aid SI-60L, Sun Aid SI-80L, Sun Aid SI-100L, Sun Aid SI- B2A, Sun Aid SI-B3 (above, manufactured by Sanshin Chemical Co., Ltd.), CYRACURE UVI-6974, CYRACURE UVI-6990 (above, manufactured by Union Carbide), UVI-508, UVI-509 (above, manufactured by General Electric). ), FC-508, FC-509 (above, manufactured by Minnesota Mining and Manufacturing), CD-1010, CD-1011 (above, manufactured by Surftmer), CI series products (manufactured by Nippon Soda), etc. Can be mentioned.
- Examples of the quaternary ammonium salt include tetrabutylammonium tetrafluoroborate, tetrabutylammonium hexafluorophosphate, tetrabutylammonium hydrogen sulfate, tetraethylammonium tetrafluoroborate, tetraethylammonium p-toluenesulfonate, N, N-dimethyl-N-.
- Benzylanilinium hexafluoroammonate N, N-dimethyl-N-benzylanilinium tetrafluoroborate, N, N-dimethyl-N-benzylpyridinium hexafluoroantimonate, N, N-diethyl-N-benzyltrifluoromethanesulfonate , N, N-dimethyl-N- (4-methoxybenzyl) pyridinium hexafluoroammonate, N, N-diethyl-N- (4-methoxybenzyl) toluidinium hexafluoroammonate and the like.
- Examples of the phosphonium salt include ethyltriphenylphosphonium hexafluoroantimonate and tetrabutylphosphonium hexafluoroantimonate.
- diazonium salt examples include AMERICURE (manufactured by American Can) and ULTRASET (manufactured by ADEKA).
- iodonium salt examples include diphenyl iodonium hexafluoroalcinate, bis (4-chlorophenyl) iodonium hexafluoroalcinate, bis (4-bromophenyl) iodonium hexafluoroalcinate, and phenyl (4-methoxyphenyl) iodonium hexafluoroalcinate. Can be mentioned.
- UV-9310C manufactured by Toshiba Silicone
- Photoinitiator 2074 manufactured by Rhone-Poulenc
- UVE series products manufactured by General Electric
- FC series products Minnesota Mining and Manufacturing
- the cationic polymerization initiator may be used alone or in combination of two or more.
- the content of the cationic polymerization initiator is preferably 0 with respect to 100 parts by mass of the total amount of the polyphenylene ether resin (A) and the polyfunctional compound (B). .1 to 6 parts by mass, more preferably 0.3 to 5 parts by mass, still more preferably 0.5 to 4 parts by mass.
- the adhesive layer may contain a reactive curing agent other than the cationic polymerization initiator.
- the reactive curing agent other than the cationic polymerization initiator include amine compounds such as benzylmethylamine and 2,4,6-trisdimethylaminomethylphenol; 2-methylimidazole, 2-ethyl-4-methylimidazole, and 2-hepta.
- Imidazole compounds such as decylimidazole; Lewis acids such as boron trifluoride / monoethylamine complex, boron trifluoride / piperazine complex; peroxides such as di (t-butylperoxy) diisopropylbenzene; Agents can be mentioned.
- the adhesive layer of the curable adhesive sheet for devices of the present invention may contain a silane coupling agent as the component (E).
- a silane coupling agent it becomes easy to obtain a cured product having better adhesive strength.
- silane coupling agent a known silane coupling agent can be used. Of these, an organosilicon compound having at least one alkoxysilyl group in the molecule is preferable.
- the silane coupling agent include 3-methacryloxypropylmethyldimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropylmethyldiethoxysilane, 3-methacryloxypropyltriethoxysilane, and 3-acryloxypropyltri.
- a silane coupling agent having a vinyl group such as vinyltrimethoxysilane, vinyltriethoxysilane, dimethoxymethylvinylsilane, diethoxymethylvinylsilane, trichlorovinylsilane, and vinyltris (2-methoxyethoxy) silane; 2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, 3-glycidoxypropyltriethoxysilane, 8-glycid Silane coupling agent having an epoxy group such as xiooctyltrimethoxysilane; Silane coupling agent having a styryl group such as p-styryltrimethoxysilane and p-s
- a silane coupling agent having a ureido group such as 3-ureidopropyltrimethoxysi
- the silane coupling agent may be used alone or in combination of two or more.
- the content of the silane coupling agent is preferably 0.01 to 5% by mass, more preferably 0.05 to 1% by mass in the adhesive layer.
- the adhesive layer of the curable adhesive sheet for devices of the present invention may or may not contain a compound having a cyclic ether group.
- the cyclic ether group examples include an oxylan group (epoxy group), an oxetane group (oxetanyl group), a tetrahydrofuryl group, a tetrahydropyranyl group and the like.
- the oxylan group includes a group having an oxylan structure such as a glycidyl group, a glycidyl ether group, and an epoxycyclohexyl group.
- a cured product of the adhesive layer containing a compound having a cyclic ether group tends to have excellent adhesive strength.
- a hydroxyl group is generated by opening the cyclic ether group, when the adhesive layer contains a compound having a cyclic ether group, it may be difficult to obtain a cured product having excellent low dielectric properties.
- the adhesive layer of the curable adhesive sheet for devices of the present invention contains the above component (B), the cured product can be sufficiently adhered without utilizing the action and effect of the compound having a cyclic ether group. Has strength. Therefore, it is preferable that the adhesive layer of the curable adhesive sheet for devices of the present invention contains almost no compound having a cyclic ether group.
- the content of the compound having a cyclic ether group is preferably less than 5% by mass, more preferably 3% by mass or less in the adhesive layer.
- the adhesive layer of the curable adhesive sheet for devices of the present invention may contain other components as long as the effects of the present invention are not impaired.
- other components include additives such as ultraviolet absorbers, antistatic agents, light stabilizers, antioxidants, resin stabilizers, fillers, pigments, bulking agents, and softeners. These can be used alone or in combination of two or more. When the adhesive layer contains these additives, the content thereof can be appropriately determined according to the purpose.
- the adhesive layer of the curable adhesive sheet for devices of the present invention preferably contains a liquid compound at 25 ° C.
- the adhesive layer of the curable adhesive sheet for devices of the present invention contains the polyphenylene ether resin (A). Since the polyphenylene ether resin (A) has a relatively rigid molecular structure, the adhesive layer containing the polyphenylene ether resin (A) may be inferior in stickability at room temperature (for example, 25 ° C., the same applies hereinafter). In this respect, by impregnating the adhesive layer with a compound that is liquid at 25 ° C., the adhesiveness of the adhesive layer at room temperature is improved.
- the content thereof is preferably 5% by mass or more, more preferably 6 to 50% by mass, in the adhesive layer from the above viewpoint. Yes, more preferably 10 to 30% by mass.
- the content of the compound liquid at 25 ° C. may be 6 to 30% by mass in the adhesive layer when the content of the binder resin described later is large.
- At least one of the compounds liquid at 25 ° C. is preferably a compound having two or more hydrocarbon groups having a double bond at the terminal (that is, a compound satisfying the requirements of the component (B)).
- a compound that satisfies the requirements of the component (B) as a liquid compound at 25 ° C., it is possible to achieve both the adhesiveness of the adhesive layer at room temperature and the low dielectric property of the cured product at a high level. ..
- the content of the liquid compound at 25 ° C. which has two or more hydrocarbon groups having a double bond at the terminal, is 90% by mass or more based on the total amount of the liquid compound at 25 ° C. It is preferably 95% by mass or more, and more preferably 95% by mass or more.
- the method for forming the adhesive layer of the curable adhesive sheet for devices of the present invention is not particularly limited.
- the cast method can be used to form the adhesive layer.
- the adhesive layer is formed by a casting method, a known method is used to apply the adhesive composition as a raw material to the peeled layer surface of the base material or the peeling film, and the obtained coating film is applied. By drying, an adhesive layer can be formed.
- the adhesive composition contains the above-mentioned components (A) and (B) and other optional components.
- the adhesive composition may further contain a solvent.
- a solvent aromatic hydrocarbon solvents such as benzene and toluene; ester solvents such as ethyl acetate and butyl acetate; ketone solvents such as acetone, methyl ethyl ketone and methyl isobutyl ketone; n-pentane, n-hexane and n- An aliphatic hydrocarbon solvent such as heptane; an alicyclic hydrocarbon solvent such as cyclopentane, cyclohexane, and methylcyclohexane; and the like can be mentioned. These solvents may be used alone or in combination of two or more. When the adhesive composition contains a solvent, the content of the solvent can be appropriately determined in consideration of coatability and the like.
- the adhesive composition can be prepared by appropriately mixing and stirring each component according to a conventional method
- Examples of the method for applying the adhesive composition include a spin coating method, a spray coating method, a bar coating method, a knife coating method, a roll coating method, a blade coating method, a die coating method, and a gravure coating method.
- Examples of the method for drying the coating film include conventionally known drying methods such as hot air drying, hot roll drying, and infrared irradiation.
- the conditions for drying the coating film are, for example, 80 to 150 ° C. for 30 seconds to 5 minutes.
- the thickness of the adhesive layer is not particularly limited, but is usually 1 to 50 ⁇ m, preferably 1 to 25 ⁇ m, and more preferably 5 to 25 ⁇ m.
- the adhesive layer having a thickness within the above range is suitably used as a material for forming a circuit board.
- the thickness of the adhesive layer can be measured according to JIS K 7130 (1999) using a known thickness gauge.
- the adhesive layer of the curable adhesive sheet for devices of the present invention has curability.
- Curability is thermosetting from the viewpoint that polymerization is possible by a simple process and that the thermosetting method is often used in circuit substrate applications, which is suitable for the use of the curable adhesive sheet for devices of the present invention. It is preferably sex. In this case, heating the adhesive layer cures the adhesive layer.
- the conditions for thermosetting the adhesive layer are not particularly limited.
- the heating temperature is 80 to 200 ° C., preferably 90 to 190 ° C. from the viewpoint of efficiently proceeding the reaction of the polyphenylene ether resin having a vinyl group.
- the heating time is usually 30 minutes to 12 hours, preferably 1 to 6 hours.
- the curable adhesive sheet for a device of the present invention is photocurable, the adhesive layer can be irradiated with, for example, ultraviolet rays as light rays for photocuring the adhesive layer.
- the cured product of the adhesive layer is excellent in low dielectric properties in the high frequency region.
- the relative permittivity of the cured product of the adhesive layer at 23 ° C. and a frequency of 1 GHz (hereinafter, this relative permittivity may be referred to as “relative permittivity ( ⁇ )”) is preferably 2.50 or less. More preferably, it is 2.40 or less. There is no particular lower limit for the relative permittivity ( ⁇ ), but it is usually 2.00 or more.
- the dielectric loss tangent of the cured product of the adhesive layer at 23 ° C. and a frequency of 1 GHz (hereinafter, this dielectric loss tangent may be referred to as “dielectric loss tangent ( ⁇ )”) is preferably 0.0030 or less, and more. It is preferably 0.0020 or less. There is no particular lower limit for the dielectric loss tangent ( ⁇ ), but it is usually 0.0001 or more.
- the measurement sample of the relative permittivity ( ⁇ ) and the dielectric loss tangent ( ⁇ ) is not particularly limited as long as the adhesive layer is sufficiently cured.
- the adhesive layer to be measured has recommended curing conditions
- the cured adhesive layer cured under the recommended conditions is used as a measurement sample for the relative permittivity ( ⁇ ) and the dielectric loss tangent ( ⁇ ).
- the adhesive layer is thermosetting and there is no recommended curing condition or it is unknown, for example, the cured product obtained at 160 ° C. for 1 hour is subjected to relative permittivity ( ⁇ ) and dielectric loss tangent ( ⁇ ). ) May be used as a measurement sample.
- the relative permittivity ( ⁇ ) and the dielectric loss tangent ( ⁇ ) can be measured according to the method described in Examples.
- the curable adhesive sheet for a device of the present invention may have a base material in addition to the adhesive layer.
- a resin film can usually be used.
- the resin components of the resin film include polyimide, polyamide, polyamideimide, polyphenylene ether, polyether ketone, polyether ether ketone, polyolefin, polyester, polycarbonate, polysulfone, polyethersulfone, polyphenylene sulfide, polyarylate, acrylic resin, and cyclo. Examples thereof include olefin-based polymers, aromatic-based polymers, polyurethane-based polymers, and liquid crystal polymer films.
- the thickness of the base material is not particularly limited, but is preferably 10 to 500 ⁇ m, more preferably 10 to 300 ⁇ m, and even more preferably 15 to 200 ⁇ m.
- the curable adhesive sheet for a device of the present invention may have a release film in addition to the adhesive layer.
- the release film functions as a protective film for the adhesive layer until the curable adhesive sheet for the device is used. Further, when the curable adhesive sheet for a device does not have a base material, the release film functions as a support in the manufacturing process of the curable adhesive sheet for a device. When the curable adhesive sheet for a device of the present invention is used, the release film is usually peeled off.
- a base material for a release film having a release layer peeled with a release agent can be mentioned.
- the base material for the release film paper base materials such as glassin paper, coated paper, and high-quality paper; laminated paper obtained by laminating a thermoplastic resin such as polyethylene on these paper base materials; polyethylene terephthalate resin, polybutylene terephthalate resin, etc.
- Plastic films such as polyethylene naphthalate resin, polypropylene resin, and polyethylene resin; and the like.
- the release agent examples include rubber-based elastomers such as silicone-based resins, olefin-based resins, isoprene-based resins, and butadiene-based resins, long-chain alkyl-based resins, alkyd-based resins, and fluorine-based resins.
- the thickness of the release film is not particularly limited, but is usually about 20 to 250 ⁇ m.
- the curable adhesive sheet for a device of the present invention may have one release film on each side of the adhesive layer, for a total of two release films, or on one side of the adhesive layer. Only may have a release film.
- the curable adhesive sheet for a device has two release films on the front and back sides of the adhesive layer, the release force of each release film may be different.
- the cured product of the adhesive layer of the curable adhesive sheet for devices of the present invention is excellent in low dielectric properties in the high frequency region. Therefore, the curable adhesive sheet for devices of the present invention is suitably used when forming a member in a device that requires low dielectric properties.
- the curable adhesive sheet for devices of the present invention by using the curable adhesive sheet for devices of the present invention, the adhesive cured product layer constituting the circuit board can be efficiently formed. That is, the curable adhesive sheet for devices of the present invention can be used as a curable adhesive sheet for circuit boards. Examples of the circuit board include a flexible printed wiring board and the like.
- Example 1 50 parts by mass of polyphenylene ether resin (A1), 10 parts by mass of polyfunctional compound (B1), 100 parts by mass of binder resin (C1), 0.5 parts by mass of cationic polymerization initiator (D1), silane coupling agent (E1) 0.2 parts by mass was dissolved in toluene to prepare an adhesive composition.
- This adhesive composition is applied onto the peeling surface of the release film (first release film, manufactured by Lintec Corporation, trade name: SP-PET752150), and the obtained coating film is dried at 100 ° C. for 2 minutes to make it thicker. An adhesive layer having a size of 15 ⁇ m was formed.
- a release-treated surface of another release film (second release film, manufactured by Lintec Corporation, trade name: SP-PET381130) is bonded onto this adhesive layer to form a curable adhesive sheet (thermosetting adhesive sheet). Obtained.
- Examples 2 to 6, Comparative Examples 1 to 4 An adhesive composition and a thermosetting adhesive sheet were obtained in the same manner as in Example 1 except that the types and amounts of the components constituting the adhesive composition were changed to those shown in Table 1.
- the cured product of the adhesive layer of the curable adhesive sheet obtained in Examples 1 to 6 has a low dielectric property in a high frequency region.
- the adhesive layers of the curable adhesive sheets obtained in Comparative Examples 1 to 4 contain a compound having a cyclic ether group instead of the component (B) of the present invention, the cured products of these adhesive layers. Is inferior in low dielectric properties in the high frequency region.
Abstract
Description
FPCは、例えば、ポリイミド等の絶縁樹脂フィルムに銅箔を貼合したもの(銅張積層板)の銅箔に対してエッチング処理を施して、電気回路を形成することにより得ることができる。
また、通常、絶縁樹脂基材と接着剤層とを有するカバーレイフィルムを、電気回路が形成された銅箔に貼合し、電気回路を保護することが行われている。 In recent years, as electronic devices have become smaller and lighter, flexible printed wiring boards (FPCs) have been increasingly used as wiring members.
FPC can be obtained, for example, by forming an electric circuit by performing an etching treatment on a copper foil obtained by laminating a copper foil on an insulating resin film such as polyimide (copper-clad laminate).
Further, usually, a coverlay film having an insulating resin base material and an adhesive layer is attached to a copper foil on which an electric circuit is formed to protect the electric circuit.
しかしながら、高周波領域の電気信号は熱に変わりやすいため、電気信号を高周波化すると伝送損失が増大する傾向があった。 By the way, in recent years, with respect to communication devices such as smartphones, the frequency of electric signals has been increasing in order to handle a larger amount of data.
However, since the electric signal in the high frequency region is easily converted into heat, the transmission loss tends to increase when the electric signal is made high frequency.
特許文献1には、その接着剤層付き積層体は、電気特性(低誘電率、低誘電正接)等に優れることも記載されている。 Patent Document 1 describes a laminate with an adhesive layer including a base film and an adhesive layer on at least one surface of the base film, wherein the adhesive layer comprises a specific adhesive composition. A laminate with an adhesive layer is described.
Patent Document 1 also describes that the laminate with an adhesive layer is excellent in electrical characteristics (low dielectric constant, low dielectric loss tangent) and the like.
しかしながら、今後予想される電気信号の更なる高周波化に対応するために、高周波領域での低誘電特性にさらに優れる硬化物を形成することが要望されていた。 The cured product of the adhesive composition described in Patent Document 1 has low dielectric properties (in the present specification, "low dielectric properties" means "low dielectric constant and low dielectric loss tangent"). ..
However, in order to cope with the further increase in the frequency of electric signals expected in the future, it has been desired to form a cured product having further excellent low dielectric properties in the high frequency region.
(A)成分:ビニル基を有するポリフェニレンエーテル樹脂
(B)成分:末端に二重結合を有する炭化水素基を2以上有する化合物
〔2〕前記(B)成分が、複素環骨格を有する化合物である、〔1〕に記載のデバイス用硬化性接着シート。
〔3〕前記複素環骨格が、イソシアヌレート骨格又はグリコールウリル骨格である、〔2〕に記載のデバイス用硬化性接着シート。
〔4〕前記(B)成分の分子量が、1,000以下である、〔1〕~〔3〕のいずれかに記載のデバイス用硬化性接着シート。
〔5〕前記(B)成分が有する、末端に二重結合を有する炭化水素基の数が2である、〔1〕~〔4〕のいずれかに記載のデバイス用硬化性接着シート。
〔6〕前記(B)成分が、下記式で表される化合物である、〔1〕~〔5〕のいずれかに記載のデバイス用硬化性接着シート。 [1] A curable adhesive sheet for a device having an adhesive layer containing the following components (A) and (B).
Component (A): Polyphenylene ether resin having a vinyl group Component (B): Compound having two or more hydrocarbon groups having a double bond at the terminal [2] The component (B) is a compound having a heterocyclic skeleton. , [1] The curable adhesive sheet for a device.
[3] The curable adhesive sheet for a device according to [2], wherein the heterocyclic skeleton is an isocyanurate skeleton or a glycoluril skeleton.
[4] The curable adhesive sheet for a device according to any one of [1] to [3], wherein the molecular weight of the component (B) is 1,000 or less.
[5] The curable adhesive sheet for a device according to any one of [1] to [4], wherein the component (B) has 2 hydrocarbon groups having a double bond at the end.
[6] The curable adhesive sheet for a device according to any one of [1] to [5], wherein the component (B) is a compound represented by the following formula.
〔7〕前記接着剤層が、オレフィン系樹脂をバインダー樹脂として含有するものである、〔1〕~〔6〕のいずれかに記載のデバイス用硬化性接着シート。
〔8〕前記接着剤層が、反応性官能基を有する樹脂をバインダー樹脂として含有するものである、〔1〕~〔7〕に記載のデバイス用硬化性接着シート。
〔9〕前記接着剤層が、さらに下記(D)成分を含有するものである、〔1〕~〔8〕のいずれかに記載のデバイス用硬化性接着シート。
(D)成分:カチオン重合開始剤
〔10〕前記接着剤層が、環状エーテル基を有する化合物を含有する層、又は、環状エーテル基を有する化合物を含有しない層であって、環状エーテル基を有する化合物の含有量が接着剤層中5質量%未満である、〔1〕~〔9〕のいずれかに記載のデバイス用硬化性接着シート。
〔11〕前記接着剤層が、25℃において液体の化合物を含有する層であって、25℃において液体の化合物の含有量が、接着剤層中5質量%以上である、〔1〕~〔10〕のいずれかに記載のデバイス用硬化性接着シート。
〔12〕25℃において液体の化合物の少なくとも1種が、末端に二重結合を有する炭化水素基を2以上有する化合物である、〔11〕に記載のデバイス用硬化性接着シート。
〔13〕末端に二重結合を有する炭化水素基を2以上有し、かつ、25℃において液体の化合物の含有量が、25℃において液体の化合物の全量中90質量%以上である、〔12〕に記載のデバイス用硬化性接着シート。 (In the formula, R represents a saturated hydrocarbon group having 5 to 15 carbon atoms.)
[7] The curable adhesive sheet for a device according to any one of [1] to [6], wherein the adhesive layer contains an olefin resin as a binder resin.
[8] The curable adhesive sheet for devices according to [1] to [7], wherein the adhesive layer contains a resin having a reactive functional group as a binder resin.
[9] The curable adhesive sheet for a device according to any one of [1] to [8], wherein the adhesive layer further contains the following component (D).
Component (D) Component: Cationic Polymerization Initiator [10] The adhesive layer is a layer containing a compound having a cyclic ether group or a layer not containing a compound having a cyclic ether group and having a cyclic ether group. The curable adhesive sheet for a device according to any one of [1] to [9], wherein the content of the compound is less than 5% by mass in the adhesive layer.
[11] The adhesive layer is a layer containing a liquid compound at 25 ° C., and the content of the liquid compound at 25 ° C. is 5% by mass or more in the adhesive layer [1] to [ 10] The curable adhesive sheet for a device according to any one of.
[12] The curable adhesive sheet for a device according to [11], wherein at least one of the compounds liquid at 25 ° C. is a compound having two or more hydrocarbon groups having a double bond at the terminal.
[13] It has two or more hydrocarbon groups having a double bond at the terminal, and the content of the liquid compound at 25 ° C. is 90% by mass or more based on the total amount of the liquid compound at 25 ° C. [12]. ] The curable adhesive sheet for the device described in.
(A)成分:ビニル基を有するポリフェニレンエーテル樹脂
(B)成分:末端に二重結合を有する炭化水素基を2以上有する化合物 The curable adhesive sheet for a device of the present invention has an adhesive layer containing the following components (A) and (B).
Component (A): Polyphenylene ether resin having a vinyl group (B) Component: A compound having two or more hydrocarbon groups having a double bond at the terminal.
本発明のデバイス用硬化性接着シートの接着剤層は、(A)成分として、ビニル基を有するポリフェニレンエーテル樹脂(以下、「ポリフェニレンエーテル樹脂(A)」ということがある。)を含有する。
ポリフェニレンエーテル樹脂とは、主鎖にポリフェニレン骨格を有する樹脂をいう。
ポリフェニレン骨格とは、下記式 [Component (A): Polyphenylene ether resin having a vinyl group]
The adhesive layer of the curable adhesive sheet for devices of the present invention contains a polyphenylene ether resin having a vinyl group (hereinafter, may be referred to as "polyphenylene ether resin (A)") as a component (A).
The polyphenylene ether resin refers to a resin having a polyphenylene skeleton in the main chain.
The polyphenylene skeleton is the following formula
ポリフェニレンエーテル樹脂(A)中のビニル基は、ビニルベンジル基、ビニルナフチル基等のように、炭化水素系置換基の一部を構成するものであってもよい。すなわち、ポリフェニレンエーテル樹脂(A)は、ポリフェニレンエーテル骨格に、ビニル基又はビニル基含有炭化水素基が結合してなるものである。 Since the polyphenylene ether resin (A) has a vinyl group, the cured product of the adhesive layer containing the polyphenylene ether resin (A) is excellent in low dielectric properties, crosslinkability and heat resistance.
The vinyl group in the polyphenylene ether resin (A) may form a part of a hydrocarbon-based substituent, such as a vinylbenzyl group and a vinylnaphthyl group. That is, the polyphenylene ether resin (A) is formed by bonding a vinyl group or a vinyl group-containing hydrocarbon group to the polyphenylene ether skeleton.
具体的には、2官能フェノール化合物と1官能フェノール化合物を反応させて、両末端にフェノール性水酸基を有する重合体を得た後、4-(クロロメチル)スチレンを用いて末端フェノール性水酸基をビニルベンジルエーテル化することで、ポリフェニレンエーテル骨格の両末端にビニルベンジル基を有するポリフェニレンエーテル樹脂(A)を得ることができる。 Such a polyphenylene ether resin (A) can be obtained by forming a polyphenylene ether skeleton and then introducing a vinyl group or a vinyl group-containing hydrocarbon group at both ends.
Specifically, a bifunctional phenol compound and a monofunctional phenol compound are reacted to obtain a polymer having phenolic hydroxyl groups at both ends, and then 4- (chloromethyl) styrene is used to change the terminal phenolic hydroxyl groups to vinyl. By benzyl etherification, a polyphenylene ether resin (A) having vinylbenzyl groups at both ends of the polyphenylene ether skeleton can be obtained.
ポリフェニレンエーテル樹脂(A)の重量平均分子量(Mw)は、テトラヒドロフラン(THF)を溶媒として用いてゲルパーミエーションクロマトグラフィー(GPC)を行い、標準ポリスチレン換算値として求めることができる。 The weight average molecular weight (Mw) of the polyphenylene ether resin (A) is preferably 500 to 5,000, more preferably 500 to 3,000.
The weight average molecular weight (Mw) of the polyphenylene ether resin (A) can be determined as a standard polystyrene-equivalent value by performing gel permeation chromatography (GPC) using tetrahydrofuran (THF) as a solvent.
ポリフェニレンエーテル樹脂(A)の含有量が、接着剤層中、10質量%以上であることで、接着剤層の硬化性を向上させつつ、低誘電特性に優れる硬化物が得られ易くなる。 The content of the polyphenylene ether resin (A) is preferably 10% by mass or more, more preferably 15 to 50% by mass in the adhesive layer. The content of the polyphenylene ether resin (A) may be 10 to 40% by mass in the adhesive layer when the content of the binder resin described later is large.
When the content of the polyphenylene ether resin (A) is 10% by mass or more in the adhesive layer, it becomes easy to obtain a cured product having excellent low dielectric properties while improving the curability of the adhesive layer.
本発明のデバイス用硬化性接着シートの接着剤層は、(B)成分として、末端に二重結合を有する炭化水素基を2以上有する化合物(以下、「多官能性化合物(B)」ということがある。)を含有する。 [Component (B): Compound having two or more hydrocarbon groups having a double bond at the terminal]
The adhesive layer of the curable adhesive sheet for devices of the present invention is a compound having two or more hydrocarbon groups having a double bond at the terminal as the component (B) (hereinafter referred to as "polyfunctional compound (B)"). There is.).
末端に二重結合を有する炭化水素基の炭素数は、好ましくは2~10、より好ましくは2~5である。
末端に二重結合を有する炭化水素基としては、ビニル基、アリル基、3-ブテニル基、4-ペンテニル基、5-ヘキセニル基、イソプロペニル基、1-メチル-2-プロペニル基、ビニルベンジル基、ビニルナフチル基等が挙げられる。これらの中でも、アリル基が好ましい。 Since the polyfunctional compound (B) has two or more hydrocarbon groups having a double bond at the terminal, the cured product of the adhesive layer containing the polyfunctional compound (B) has low dielectric properties, crosslinkability and adhesion. Excellent in strength.
The hydrocarbon group having a double bond at the terminal has preferably 2 to 10 carbon atoms, more preferably 2 to 5 carbon atoms.
Hydrocarbon groups having a double bond at the terminal include a vinyl group, an allyl group, a 3-butenyl group, a 4-pentenyl group, a 5-hexenyl group, an isopropenyl group, a 1-methyl-2-propenyl group, and a vinylbenzyl group. , Vinyl naphthyl group and the like. Among these, an allyl group is preferable.
また、硬化物中に形成される架橋構造が適度に疎らであることで、硬化後の接着剤層のクラックの発生が抑制される観点から、末端に二重結合を有する炭化水素基の数は、好ましくは2~4、より好ましくは2である。末端に二重結合を有する炭化水素基の数が2であることで、多官能性化合物(B)の硬化性を発揮しつつ、多官能性化合物(B)の配合量が多い場合であっても、接着剤層の硬化収縮を抑えることができ、デバイス用硬化性接着シートを回路基板等の板状部材の接着に用いた場合に、板状部材の反りを低減することができる。末端に二重結合を有する炭化水素基の二重結合が重合した場合、重合前のモノマー間の距離(すなわちVan der Waals距離で示される二重結合間の距離)が、重合により、繰り返し単位間の距離(ポリマー中の共有結合の距離)に短くなるため、末端に二重結合を有する炭化水素基の数が多いほど、硬化性接着剤層の硬化収縮が大きくなる傾向がある。多官能性化合物(B)として、末端に二重結合を有する炭化水素基の数が2である化合物を選択することで、硬化収縮を効率的に抑制することが可能である。 The number of hydrocarbon groups having a double bond at the terminal contained in the polyfunctional compound (B) is 2 or more. When the number of hydrocarbon groups having a double bond at the terminal is 2 or more, a crosslinked structure is formed in the cured product, and a cured product having better adhesive strength and heat resistance can be formed.
In addition, since the crosslinked structure formed in the cured product is appropriately sparse, the number of hydrocarbon groups having double bonds at the ends is increased from the viewpoint of suppressing the occurrence of cracks in the adhesive layer after curing. , Preferably 2-4, more preferably 2. When the number of hydrocarbon groups having a double bond at the terminal is 2, the amount of the polyfunctional compound (B) blended is large while exhibiting the curability of the polyfunctional compound (B). In addition, the curing shrinkage of the adhesive layer can be suppressed, and when the curable adhesive sheet for a device is used for adhering a plate-shaped member such as a circuit board, the warp of the plate-shaped member can be reduced. When the double bond of a hydrocarbon group having a double bond at the terminal is polymerized, the distance between the monomers before the polymerization (that is, the distance between the double bonds indicated by the Van der Waals distance) is increased between the repeating units by the polymerization. As the number of hydrocarbon groups having a double bond at the end increases, the curing shrinkage of the curable adhesive layer tends to increase. By selecting a compound having a double bond at the terminal and having 2 hydrocarbon groups as the polyfunctional compound (B), it is possible to efficiently suppress curing shrinkage.
複素環骨格としては、イソシアヌレート骨格やグリコールウリル骨格が挙げられる。 The polyfunctional compound (B) preferably has a heterocyclic skeleton. Since the polyfunctional compound (B) has a heterocyclic skeleton, it becomes easy to obtain a cured product having excellent adhesive strength and low dielectric properties.
Examples of the heterocyclic skeleton include an isocyanurate skeleton and a glycoluril skeleton.
式(8)中、R24~R26は、それぞれ独立に、末端に二重結合を有する炭化水素基を表す。 In the formula (7), R 21 and R 22 each independently represent a hydrocarbon group having a double bond at the terminal, and R 23 is a saturated hydrocarbon group having 1 to 15 carbon atoms and 1 to 15 carbon atoms. Represents an alkoxy group-substituted alkyl group.
In formula (8), R 24 to R 26 each independently represent a hydrocarbon group having a double bond at the end.
例えば、式(7)で表される化合物としては、L-DAIC(四国化成工業社製)が挙げられる。式(8)で表される化合物としては、TAIC(三菱ケミカル社製)が挙げられる。式(9)で表される化合物としてはTA-G(四国化成工業社製)が挙げられる。 As the polyfunctional compound (B), a commercially available product can be used.
For example, examples of the compound represented by the formula (7) include L-DAIC (manufactured by Shikoku Chemicals Corporation). Examples of the compound represented by the formula (8) include TAIC (manufactured by Mitsubishi Chemical Corporation). Examples of the compound represented by the formula (9) include TA-G (manufactured by Shikoku Chemicals Corporation).
分子量が1,000以下の多官能性化合物(B)は、25℃で液体という要件を満たす傾向がある。後述するように、多官能性化合物(B)が25℃で液体の化合物であることで、接着剤層の常温での貼付性が向上する。
「25℃で液体」とは、25℃において流動性を有することを意味する。例えば、25℃で液体の化合物とは、E型粘度計を用いて、25℃、1.0rpmにて測定した粘度が、2~10000mPa・sの化合物である。 The molecular weight of the polyfunctional compound (B) is preferably 1,000 or less, more preferably 800 or less, and even more preferably 500 or less.
The polyfunctional compound (B) having a molecular weight of 1,000 or less tends to satisfy the requirement of being a liquid at 25 ° C. As will be described later, when the polyfunctional compound (B) is a compound that is liquid at 25 ° C., the adhesive layer has improved adhesiveness at room temperature.
"Liquid at 25 ° C" means having fluidity at 25 ° C. For example, a compound that is liquid at 25 ° C. is a compound having a viscosity of 2 to 10000 mPa · s measured at 25 ° C. and 1.0 rpm using an E-type viscometer.
分子量が高い多官能性化合物(B)は、接着剤層を形成する際の乾燥工程や、接着剤層を硬化させる工程が、熱硬化工程であっても揮発し難いため、目的の物性を有する硬化物が得られ易くなる。
多官能性化合物(B)の沸点は、好ましくは175~350℃、より好ましくは200~300℃である。また、多官能化合物(B)の5%重量減少温度は、好ましくは175~350℃、より好ましくは200~300℃である。 The molecular weight of the polyfunctional compound (B) is preferably 100 or more, more preferably 200 or more, and even more preferably 275 or more.
The polyfunctional compound (B) having a high molecular weight has the desired physical properties because the drying step when forming the adhesive layer and the step of curing the adhesive layer are difficult to volatilize even in the thermosetting step. A cured product can be easily obtained.
The boiling point of the polyfunctional compound (B) is preferably 175 to 350 ° C, more preferably 200 to 300 ° C. The 5% weight loss temperature of the polyfunctional compound (B) is preferably 175 to 350 ° C, more preferably 200 to 300 ° C.
多官能性化合物(B)の含有量は、接着剤層中、好ましくは5質量%以上、より好ましくは6~50質量%、さらに好ましくは10~30質量%である。多官能性化合物(B)の含有量は、後述するバインダー樹脂の含有量が多い場合には、接着剤層中、6~30質量%としてもよい。
多官能性化合物(B)の含有量が、接着剤層中、5質量%以上であることで、接着強度及び低誘電特性に優れる硬化物が得られ易くなる。
また、後述するように、接着剤層の常温での貼付性の観点から、接着剤層が、25℃で液体の化合物を含有することが好ましいが、この25℃で液体の化合物は、多官能性化合物(B)であることが好ましい。すなわち、接着剤層の常温での貼付性を向上させるという点や、硬化反応を促進するという点では、環状エーテル基を有し、かつ、25℃で液体の化合物も有効であると考えられる。しかしながら、環状エーテル基を有する化合物を用いると、低誘電特性に優れる硬化物が得られにくくなるおそれがある。この点、多官能性化合物(B)は、環状エーテル基を有する化合物を用いた場合と異なり二重結合を有する炭化水素基が硬化反応に関与するため、接着剤層中の含有量が多くても硬化物の低誘電特性を維持できる傾向がある。したがって、多官能性化合物(B)が25℃で液体であれば、硬化物の低誘電特性を損なうことなく、接着剤層に25℃で液体の化合物を好適な量で含有させることができる。よって、25℃で液体である多官能性化合物(B)の含有量は、接着剤層中、5質量%以上であることが好ましく、6~50質量%であることがより好ましく、10~30質量%であることがさらに好ましい。25℃で液体である多官能性化合物(B)の含有量は、後述するバインダー樹脂の含有量が多い場合には、接着剤層中、6~30質量%としてもよい。 The polyfunctional compound (B) can be used alone or in combination of two or more.
The content of the polyfunctional compound (B) is preferably 5% by mass or more, more preferably 6 to 50% by mass, and further preferably 10 to 30% by mass in the adhesive layer. The content of the polyfunctional compound (B) may be 6 to 30% by mass in the adhesive layer when the content of the binder resin described later is large.
When the content of the polyfunctional compound (B) is 5% by mass or more in the adhesive layer, a cured product having excellent adhesive strength and low dielectric properties can be easily obtained.
Further, as will be described later, from the viewpoint of the adhesiveness of the adhesive layer at room temperature, it is preferable that the adhesive layer contains a compound that is liquid at 25 ° C., but the compound that is liquid at 25 ° C. is polyfunctional. It is preferably the sex compound (B). That is, it is considered that a compound having a cyclic ether group and liquid at 25 ° C. is also effective in terms of improving the adhesiveness of the adhesive layer at room temperature and promoting the curing reaction. However, if a compound having a cyclic ether group is used, it may be difficult to obtain a cured product having excellent low dielectric properties. In this respect, the polyfunctional compound (B) has a large content in the adhesive layer because the hydrocarbon group having a double bond is involved in the curing reaction, unlike the case where the compound having a cyclic ether group is used. Also tends to maintain the low dielectric properties of the cured product. Therefore, if the polyfunctional compound (B) is liquid at 25 ° C., the adhesive layer can contain the compound liquid at 25 ° C. in a suitable amount without impairing the low dielectric property of the cured product. Therefore, the content of the polyfunctional compound (B), which is liquid at 25 ° C., is preferably 5% by mass or more, more preferably 6 to 50% by mass, and 10 to 30% by mass in the adhesive layer. It is more preferably mass%. The content of the polyfunctional compound (B), which is liquid at 25 ° C., may be 6 to 30% by mass in the adhesive layer when the content of the binder resin described later is large.
本発明のデバイス用硬化性接着シートの接着剤層は、(C)成分として、バインダー樹脂を含有してもよい。
後述するように、本発明のデバイス用硬化性接着シートの接着剤層は、25℃において液体の化合物を含有する場合がある。このような場合に、接着剤層がバインダー樹脂を含有することで、接着剤層としての形状が保持され易くなる。 [(C) component: binder resin]
The adhesive layer of the curable adhesive sheet for devices of the present invention may contain a binder resin as the component (C).
As will be described later, the adhesive layer of the curable adhesive sheet for devices of the present invention may contain a liquid compound at 25 ° C. In such a case, the adhesive layer containing the binder resin makes it easier to maintain the shape of the adhesive layer.
バインダー樹脂としては、オレフィン系樹脂、アクリル重合体、ポリエステル樹脂、ポリビニルアルコール樹脂、ポリビニルブチラール、ポリ塩化ビニル、フェノキシ樹脂、ポリアミド樹脂、セルロース系材料、ポリビニルエーテル、ポリイミド樹脂、スチレン-イソプレン-スチレンブロック共重合体、スチレン-ブタジエン-スチレンブロック共重合体等が挙げられる。 The binder resin is not particularly limited as long as it is a polymer component that imparts film-forming property and flexibility to the adhesive layer.
Binder resins include olefin resins, acrylic polymers, polyester resins, polyvinyl alcohol resins, polyvinyl butyral, polyvinyl chloride, phenoxy resins, polyamide resins, cellulose-based materials, polyvinyl ethers, polyimide resins, and styrene-isoprene-styrene blocks. Examples thereof include polymers, styrene-butadiene-styrene block copolymers and the like.
オレフィン系樹脂とは、オレフィン系単量体由来の繰り返し単位を含む重合体をいう。オレフィン系樹脂は、オレフィン系単量体由来の繰り返し単位のみからなる重合体であってもよいし、オレフィン系単量体由来の繰り返し単位と、オレフィン系単量体と共重合可能な単量体由来の繰り返し単位とからなる重合体であってもよいが、低誘電特性に優れる硬化物が得られ易いという観点から、オレフィン系単量体由来の繰り返し単位のみからなる重合体であることが好ましい。 As the binder resin, an olefin resin is preferable because a cured product having excellent low dielectric properties can be easily obtained.
The olefin-based resin refers to a polymer containing a repeating unit derived from an olefin-based monomer. The olefin-based resin may be a polymer consisting of only repeating units derived from the olefin-based monomer, or the repeating units derived from the olefin-based monomer and a monomer copolymerizable with the olefin-based monomer. A polymer composed of repeating units derived from the same may be used, but from the viewpoint that a cured product having excellent low dielectric properties can be easily obtained, a polymer consisting only of repeating units derived from an olefin-based monomer is preferable. ..
オレフィン系単量体と共重合可能な単量体としては、酢酸ビニル、(メタ)アクリル酸エステル、スチレン等が挙げられる。ここで、「(メタ)アクリル酸」は、アクリル酸又はメタクリル酸の意味である(以下にて同じ。)。
これらのオレフィン系単量体と共重合可能な単量体は、1種を単独で、あるいは2種以上を組み合わせて用いることができる。 As the olefin-based monomer, α-olefin having 2 to 8 carbon atoms is preferable, ethylene, propylene, 1-butene, isobutylene, or 1-hexene is more preferable, and ethylene or propylene is further preferable. These olefin-based monomers may be used alone or in combination of two or more.
Examples of the monomer copolymerizable with the olefin-based monomer include vinyl acetate, (meth) acrylic acid ester, and styrene. Here, "(meth) acrylic acid" means acrylic acid or methacrylic acid (the same shall apply hereinafter).
As the monomer copolymerizable with these olefin-based monomers, one type can be used alone, or two or more types can be used in combination.
変性ポリオレフィン樹脂は、前駆体としてのオレフィン系樹脂に、変性剤(分子内に、官能基を有する化合物)を用いて変性処理を施して得られる、反応性官能基が導入されたオレフィン系樹脂である。 A modified polyolefin resin is preferable as the binder resin because it is easy to obtain a cured product having excellent low dielectric properties and because it is easy to obtain a cured product having excellent heat resistance.
The modified polyolefin resin is an olefin resin having a reactive functional group introduced therein, which is obtained by subjecting an olefin resin as a precursor to a modification treatment using a modifier (a compound having a functional group in the molecule). be.
酸変性ポリオレフィン樹脂とは、オレフィン系樹脂を酸又は酸無水物でグラフト変性したものをいう。例えば、オレフィン系樹脂に、不飽和カルボン酸又は不飽和カルボン酸無水物(以下、「不飽和カルボン酸等」ということがある。)を反応させて、カルボキシル基又はカルボン酸無水物基を導入(グラフト変性)したものが挙げられる。 As the modified polyolefin resin, an acid-modified polyolefin resin is preferable because a cured product having a higher adhesive strength is formed.
The acid-modified polyolefin resin refers to an olefin-based resin graft-modified with an acid or an acid anhydride. For example, an unsaturated carboxylic acid or an unsaturated carboxylic acid anhydride (hereinafter, may be referred to as “unsaturated carboxylic acid or the like”) is reacted with an olefin resin to introduce a carboxyl group or a carboxylic acid anhydride group (hereinafter, it may be referred to as “unsaturated carboxylic acid or the like”). Those that have been graft-modified) can be mentioned.
これらは、1種を単独で、あるいは2種以上を組み合わせて用いることができる。これらの中でも、接着強度により優れる硬化物が得られ易いことから、無水マレイン酸が好ましい。 Examples of the unsaturated carboxylic acid to be reacted with the olefin resin include unsaturated carboxylic acids such as maleic acid, fumaric acid, itaconic acid, citraconic acid, glutaconic acid, tetrahydrophthalic acid and aconitic acid; maleic anhydride, itaconic anhydride, etc. Unsaturated carboxylic acid anhydrides such as glutaconic acid anhydride, citraconic acid anhydride, aconitic acid anhydride, norbornene dicarboxylic acid anhydride, and tetrahydrophthalic acid anhydride; can be mentioned.
These can be used alone or in combination of two or more. Among these, maleic anhydride is preferable because a cured product having better adhesive strength can be easily obtained.
バインダー樹脂の数平均分子量(Mn)は、テトラヒドロフラン(THF)を溶媒として用いてゲルパーミエーションクロマトグラフィー(GPC)を行い、標準ポリスチレン換算値として求めることができる。 The number average molecular weight (Mn) of the binder resin is preferably 10,000 to 150,000, more preferably 30,000 to 100,000.
The number average molecular weight (Mn) of the binder resin can be determined as a standard polystyrene-equivalent value by performing gel permeation chromatography (GPC) using tetrahydrofuran (THF) as a solvent.
接着剤層がバインダー樹脂を含有する場合、バインダー樹脂の含有量は、接着剤層中、好ましくは40~80質量%、より好ましくは45~80質量%である。
バインダー樹脂の含有量が、接着剤層中40~80質量%であることで、形状保持性とタック性が両立した接着剤層が得られ易くなる。 As the binder resin, one type can be used alone, or two or more types can be used in combination.
When the adhesive layer contains a binder resin, the content of the binder resin is preferably 40 to 80% by mass, more preferably 45 to 80% by mass in the adhesive layer.
When the content of the binder resin is 40 to 80% by mass in the adhesive layer, it becomes easy to obtain an adhesive layer having both shape retention and tackiness.
本発明のデバイス用硬化性接着シートの接着剤層は、(D)成分として、カチオン重合開始剤を含有してもよい。
カチオン重合開始剤は、効率よく(A)成分及び(B)成分の重合反応を進行させ、また、他の硬化剤に比べて接着剤層の保存安定性を向上させることができるため好ましい。
カチオン重合開始剤としては、熱カチオン重合開始剤や、光カチオン重合開始剤が挙げられ、簡便な工程により重合が可能な熱カチオン重合開始剤が好ましい。 [Component (D): Cationic polymerization initiator]
The adhesive layer of the curable adhesive sheet for devices of the present invention may contain a cationic polymerization initiator as the component (D).
The cationic polymerization initiator is preferable because it can efficiently proceed with the polymerization reaction of the components (A) and (B) and can improve the storage stability of the adhesive layer as compared with other curing agents.
Examples of the cationic polymerization initiator include a thermal cationic polymerization initiator and a photocationic polymerization initiator, and a thermal cationic polymerization initiator that can be polymerized by a simple step is preferable.
熱カチオン重合開始剤としては、スルニホウム塩、第四級アンモニウム塩、ホスホニウム塩、ジアゾニウム塩、ヨードニウム塩等が挙げられる。 The thermal cationic polymerization initiator is a compound capable of generating a cationic species that initiates polymerization by heating.
Examples of the thermal cationic polymerization initiator include sulnifoam salt, quaternary ammonium salt, phosphonium salt, diazonium salt, iodonium salt and the like.
接着剤層がカチオン重合開始剤を含有する場合、カチオン重合開始剤の含有量は、ポリフェニレンエーテル樹脂(A)、及び多官能性化合物(B)の合計量100質量部に対して、好ましくは0.1~6質量部、より好ましくは0.3~5質量部、さらに好ましくは0.5~4質量部である。 The cationic polymerization initiator may be used alone or in combination of two or more.
When the adhesive layer contains a cationic polymerization initiator, the content of the cationic polymerization initiator is preferably 0 with respect to 100 parts by mass of the total amount of the polyphenylene ether resin (A) and the polyfunctional compound (B). .1 to 6 parts by mass, more preferably 0.3 to 5 parts by mass, still more preferably 0.5 to 4 parts by mass.
本発明のデバイス用硬化性接着シートの接着剤層は、(E)成分として、シランカップリング剤を含有してもよい。
接着剤層がシランカップリング剤を含有することで、接着強度により優れる硬化物が得られ易くなる。 [Component (E): Silane coupling agent]
The adhesive layer of the curable adhesive sheet for devices of the present invention may contain a silane coupling agent as the component (E).
When the adhesive layer contains a silane coupling agent, it becomes easy to obtain a cured product having better adhesive strength.
シランカップリング剤としては、3-メタクリロキシプロピルメチルジメトキシシラン、3-メタクリロキシプロピルトリメトキシシラン、3-メタクリロキシプロピルメチルジエトキシシラン、3-メタクリロキシプロピルトリエトキシシラン、3-アクリロキシプロピルトリメトキシシラン等の(メタ)アクリロイル基を有するシランカップリング剤;
ビニルトリメトキシシラン、ビニルトリエトキシシラン、ジメトキシメチルビニルシラン、ジエトキシメチルビニルシラン、トリクロロビニルシラン、ビニルトリス(2-メトキシエトキシ)シラン等のビニル基を有するシランカップリング剤;
2-(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、3-グリシドキシプロピルトリメトキシシラン、3-グリシドキシプロピルメチルジエトキシシラン、3-グリシドキシプロピルトリエトキシシラン、8-グリシドキシオクチルトリメトキシシラン等のエポキシ基を有するシランカップリング剤;
p-スチリルトリメトキシシラン、p-スチリルトリエトキシシラン等のスチリル基を有するシランカップリング剤; As the silane coupling agent, a known silane coupling agent can be used. Of these, an organosilicon compound having at least one alkoxysilyl group in the molecule is preferable.
Examples of the silane coupling agent include 3-methacryloxypropylmethyldimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropylmethyldiethoxysilane, 3-methacryloxypropyltriethoxysilane, and 3-acryloxypropyltri. Silane coupling agent having a (meth) acryloyl group such as methoxysilane;
A silane coupling agent having a vinyl group such as vinyltrimethoxysilane, vinyltriethoxysilane, dimethoxymethylvinylsilane, diethoxymethylvinylsilane, trichlorovinylsilane, and vinyltris (2-methoxyethoxy) silane;
2- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, 3-glycidoxypropyltriethoxysilane, 8-glycid Silane coupling agent having an epoxy group such as xiooctyltrimethoxysilane;
Silane coupling agent having a styryl group such as p-styryltrimethoxysilane and p-styryltriethoxysilane;
3-ウレイドプロピルトリメトキシシラン、3-ウレイドプロピルトリエトキシシラン等のウレイド基を有するシランカップリング剤;
3-クロロプロピルトリメトキシシラン、3-クロロプロピルトリエトキシシラン等のハロゲン原子を有するシランカップリング剤;
3-メルカプトプロピルメチルジメトキシシラン、3-メルカプトプロピルトリメトキシシラン等のメルカプト基を有するシランカップリング剤;
ビス(トリメトキシシリルプロピル)テトラスルフィド、ビス(トリエトキシシリルプロピル)テトラスルフィド等のスルフィド基を有するシランカップリング剤;
3-イソシアネートプロピルトリメトキシシラン、3-イソシアネートプロピルトリエトキシシラン等のイソシアネート基を有するシランカップリング剤;
アリルトリクロロシラン、アリルトリエトキシシラン、アリルトリメトキシシラン等のアリル基を有するシランカップリング剤;
3-ヒドキシプロピルトリメトキシシラン、3-ヒドキシプロピルトリエトキシシラン等の水酸基を有するシランカップリング剤;等が挙げられる。 N- (2-aminoethyl) -3-aminopropylmethyldimethoxysilane, N- (2-aminoethyl) -3-aminopropyltrimethoxysilane, N- (2-aminoethyl) -3-aminopropyltriethoxysilane , 3-Aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-triethoxysilyl-N- (1,3-dimethylbutylidene) propylamine, N-phenyl-3-aminopropyltrimethoxysilane, N -(Vinylbenzyl) -2-aminoethyl-3-aminopropyltrimethoxysilane hydrochloride and other silane coupling agents having an amino group;
A silane coupling agent having a ureido group such as 3-ureidopropyltrimethoxysilane and 3-ureidopropyltriethoxysilane;
Silane coupling agent having halogen atoms such as 3-chloropropyltrimethoxysilane and 3-chloropropyltriethoxysilane;
A silane coupling agent having a mercapto group such as 3-mercaptopropylmethyldimethoxysilane and 3-mercaptopropyltrimethoxysilane;
Silane coupling agent having a sulfide group such as bis (trimethoxysilylpropyl) tetrasulfide and bis (triethoxysilylpropyl) tetrasulfide;
Silane coupling agent having an isocyanate group such as 3-isocyanatepropyltrimethoxysilane and 3-isocyanatepropyltriethoxysilane;
A silane coupling agent having an allyl group such as allyltrichlorosilane, allyltriethoxysilane, and allyltrimethoxysilane;
Examples thereof include a silane coupling agent having a hydroxyl group such as 3-hydroxypropyltrimethoxysilane and 3-hydroxypropyltriethoxysilane; and the like.
接着剤層がシランカップリング剤を含有する場合、シランカップリング剤の含有量は、接着剤層中、好ましくは0.01~5質量%、より好ましくは0.05~1質量%である。 The silane coupling agent may be used alone or in combination of two or more.
When the adhesive layer contains a silane coupling agent, the content of the silane coupling agent is preferably 0.01 to 5% by mass, more preferably 0.05 to 1% by mass in the adhesive layer.
本発明のデバイス用硬化性接着シートの接着剤層は、環状エーテル基を有する化合物を含有してもよいし、含有しなくてもよい。 [Cyclic ether compound]
The adhesive layer of the curable adhesive sheet for devices of the present invention may or may not contain a compound having a cyclic ether group.
なお、本明細書において、オキシラン基には、グリシジル基、グリシジルエーテル基、エポキシシクロヘキシル基等のオキシラン構造を有する基が含まれる。 Examples of the cyclic ether group include an oxylan group (epoxy group), an oxetane group (oxetanyl group), a tetrahydrofuryl group, a tetrahydropyranyl group and the like.
In the present specification, the oxylan group includes a group having an oxylan structure such as a glycidyl group, a glycidyl ether group, and an epoxycyclohexyl group.
しかしながら、環状エーテル基が開環することにより水酸基が生じるため、接着剤層が環状エーテル基を有する化合物を含有する場合、低誘電特性に優れる硬化物が得られにくくなるおそれがある。 A cured product of the adhesive layer containing a compound having a cyclic ether group tends to have excellent adhesive strength.
However, since a hydroxyl group is generated by opening the cyclic ether group, when the adhesive layer contains a compound having a cyclic ether group, it may be difficult to obtain a cured product having excellent low dielectric properties.
したがって、本発明のデバイス用硬化性接着シートの接着剤層は、環状エーテル基を有する化合物をほとんど含有しないことが好ましい。
環状エーテル基を有する化合物の含有量は、接着剤層中、好ましくは5質量%未満であり、より好ましくは3質量%以下である。 Further, since the adhesive layer of the curable adhesive sheet for devices of the present invention contains the above component (B), the cured product can be sufficiently adhered without utilizing the action and effect of the compound having a cyclic ether group. Has strength.
Therefore, it is preferable that the adhesive layer of the curable adhesive sheet for devices of the present invention contains almost no compound having a cyclic ether group.
The content of the compound having a cyclic ether group is preferably less than 5% by mass, more preferably 3% by mass or less in the adhesive layer.
本発明のデバイス用硬化性接着シートの接着剤層は、本発明の効果を妨げない範囲で、その他の成分を含有してもよい。
その他の成分としては、紫外線吸収剤、帯電防止剤、光安定剤、酸化防止剤、樹脂安定剤、充填剤、顔料、増量剤、軟化剤等の添加剤が挙げられる。
これらは1種を単独で、あるいは2種以上を組み合わせて用いることができる。
接着剤層がこれらの添加剤を含有するとき、その含有量は、目的に合わせて適宜決定することができる。
〔接着剤層〕 [Other ingredients]
The adhesive layer of the curable adhesive sheet for devices of the present invention may contain other components as long as the effects of the present invention are not impaired.
Examples of other components include additives such as ultraviolet absorbers, antistatic agents, light stabilizers, antioxidants, resin stabilizers, fillers, pigments, bulking agents, and softeners.
These can be used alone or in combination of two or more.
When the adhesive layer contains these additives, the content thereof can be appropriately determined according to the purpose.
[Adhesive layer]
上記のように、本発明のデバイス用硬化性接着シートの接着剤層はポリフェニレンエーテル樹脂(A)を含有する。ポリフェニレンエーテル樹脂(A)は比較的剛直な分子構造を有するため、ポリフェニレンエーテル樹脂(A)を含有する接着剤層は常温(例えば25℃、以下同じ)での貼付性に劣るおそれがある。
この点、接着剤層に25℃で液体の化合物を含ませることで、接着剤層の常温での貼付性が向上する。 The adhesive layer of the curable adhesive sheet for devices of the present invention preferably contains a liquid compound at 25 ° C.
As described above, the adhesive layer of the curable adhesive sheet for devices of the present invention contains the polyphenylene ether resin (A). Since the polyphenylene ether resin (A) has a relatively rigid molecular structure, the adhesive layer containing the polyphenylene ether resin (A) may be inferior in stickability at room temperature (for example, 25 ° C., the same applies hereinafter).
In this respect, by impregnating the adhesive layer with a compound that is liquid at 25 ° C., the adhesiveness of the adhesive layer at room temperature is improved.
25℃において液体の化合物として、(B)成分の要件を充足する化合物を用いることで、接着剤層の常温での貼付性と、その硬化物の低誘電特性を高いレベルで両立させることができる。
この観点から、末端に二重結合を有する炭化水素基を2以上有し、かつ、25℃において液体の化合物の含有量は、25℃において液体の化合物の全量中90質量%以上であることが好ましく、95質量%以上であることがより好ましい。 At least one of the compounds liquid at 25 ° C. is preferably a compound having two or more hydrocarbon groups having a double bond at the terminal (that is, a compound satisfying the requirements of the component (B)).
By using a compound that satisfies the requirements of the component (B) as a liquid compound at 25 ° C., it is possible to achieve both the adhesiveness of the adhesive layer at room temperature and the low dielectric property of the cured product at a high level. ..
From this viewpoint, the content of the liquid compound at 25 ° C., which has two or more hydrocarbon groups having a double bond at the terminal, is 90% by mass or more based on the total amount of the liquid compound at 25 ° C. It is preferably 95% by mass or more, and more preferably 95% by mass or more.
接着剤層をキャスト法により形成する場合、公知の方法を用いて、原料である接着剤組成物を、基材又は剥離フィルムの剥離処理された剥離層面に塗工し、得られた塗膜を乾燥することで、接着剤層を形成することができる。 The method for forming the adhesive layer of the curable adhesive sheet for devices of the present invention is not particularly limited. For example, the cast method can be used to form the adhesive layer.
When the adhesive layer is formed by a casting method, a known method is used to apply the adhesive composition as a raw material to the peeled layer surface of the base material or the peeling film, and the obtained coating film is applied. By drying, an adhesive layer can be formed.
接着剤組成物は、さらに溶媒を含有してもよい。
溶媒としては、ベンゼン、トルエンなどの芳香族炭化水素系溶媒;酢酸エチル、酢酸ブチルなどのエステル系溶媒;アセトン、メチルエチルケトン、メチルイソブチルケトンなどのケトン系溶媒;n-ペンタン、n-ヘキサン、n-ヘプタンなどの脂肪族炭化水素系溶媒;シクロペンタン、シクロヘキサン、メチルシクロヘキサンなどの脂環式炭化水素系溶媒;等が挙げられる。
これらの溶媒は、1種を単独で、あるいは2種以上を組み合わせて用いることができる。
接着剤組成物が溶媒を含有するとき、溶媒の含有量は、塗工性等を考慮して適宜決定することができる。
接着剤組成物は、各成分を、常法に従って適宜混合・攪拌することにより調製することができる。 The adhesive composition contains the above-mentioned components (A) and (B) and other optional components.
The adhesive composition may further contain a solvent.
As the solvent, aromatic hydrocarbon solvents such as benzene and toluene; ester solvents such as ethyl acetate and butyl acetate; ketone solvents such as acetone, methyl ethyl ketone and methyl isobutyl ketone; n-pentane, n-hexane and n- An aliphatic hydrocarbon solvent such as heptane; an alicyclic hydrocarbon solvent such as cyclopentane, cyclohexane, and methylcyclohexane; and the like can be mentioned.
These solvents may be used alone or in combination of two or more.
When the adhesive composition contains a solvent, the content of the solvent can be appropriately determined in consideration of coatability and the like.
The adhesive composition can be prepared by appropriately mixing and stirring each component according to a conventional method.
塗膜を乾燥するときの条件としては、例えば、80~150℃で30秒から5分間である。 Examples of the method for drying the coating film include conventionally known drying methods such as hot air drying, hot roll drying, and infrared irradiation.
The conditions for drying the coating film are, for example, 80 to 150 ° C. for 30 seconds to 5 minutes.
接着剤層の厚さは、公知の厚み計を用いて、JIS K 7130(1999)に準じて測定することができる。 The thickness of the adhesive layer is not particularly limited, but is usually 1 to 50 μm, preferably 1 to 25 μm, and more preferably 5 to 25 μm. The adhesive layer having a thickness within the above range is suitably used as a material for forming a circuit board.
The thickness of the adhesive layer can be measured according to JIS K 7130 (1999) using a known thickness gauge.
加熱温度は、ビニル基を有するポリフェニレンエーテル樹脂の反応を効率的に進行させる観点から、80~200℃、好ましくは90~190℃である。
加熱時間は、通常、30分から12時間、好ましくは1~6時間である。
また、本発明のデバイス用硬化性接着シートが光硬化性である場合、接着剤層を光硬化させるための光線として、例えば、紫外線を接着剤層に照射することができる。 When the curable adhesive sheet for a device of the present invention is thermosetting, the conditions for thermosetting the adhesive layer are not particularly limited.
The heating temperature is 80 to 200 ° C., preferably 90 to 190 ° C. from the viewpoint of efficiently proceeding the reaction of the polyphenylene ether resin having a vinyl group.
The heating time is usually 30 minutes to 12 hours, preferably 1 to 6 hours.
Further, when the curable adhesive sheet for a device of the present invention is photocurable, the adhesive layer can be irradiated with, for example, ultraviolet rays as light rays for photocuring the adhesive layer.
接着剤層の硬化物の、23℃、周波数1GHzにおける比誘電率(以下、この比誘電率を「比誘電率(α)」と記載することがある。)は、好ましくは2.50以下、より好ましくは2.40以下である。
比誘電率(α)の下限は特にないが、通常2.00以上である。 The cured product of the adhesive layer is excellent in low dielectric properties in the high frequency region.
The relative permittivity of the cured product of the adhesive layer at 23 ° C. and a frequency of 1 GHz (hereinafter, this relative permittivity may be referred to as “relative permittivity (α)”) is preferably 2.50 or less. More preferably, it is 2.40 or less.
There is no particular lower limit for the relative permittivity (α), but it is usually 2.00 or more.
誘電正接(β)の下限は特にないが、通常0.0001以上である。 The dielectric loss tangent of the cured product of the adhesive layer at 23 ° C. and a frequency of 1 GHz (hereinafter, this dielectric loss tangent may be referred to as “dielectric loss tangent (β)”) is preferably 0.0030 or less, and more. It is preferably 0.0020 or less.
There is no particular lower limit for the dielectric loss tangent (β), but it is usually 0.0001 or more.
例えば、測定される接着剤層に推奨硬化条件が存在する場合は、その推奨条件で硬化された接着剤層硬化物が比誘電率(α)及び誘電正接(β)の測定試料として用いられる。接着剤層が熱硬化性であって、推奨硬化条件がない、または不明の場合は、たとえば160℃で1時間の硬化条件で得られた硬化物を比誘電率(α)及び誘電正接(β)の測定試料としてもよい。
比誘電率(α)及び誘電正接(β)は、実施例に記載の方法に従って測定することができる。 The measurement sample of the relative permittivity (α) and the dielectric loss tangent (β) is not particularly limited as long as the adhesive layer is sufficiently cured.
For example, if the adhesive layer to be measured has recommended curing conditions, the cured adhesive layer cured under the recommended conditions is used as a measurement sample for the relative permittivity (α) and the dielectric loss tangent (β). If the adhesive layer is thermosetting and there is no recommended curing condition or it is unknown, for example, the cured product obtained at 160 ° C. for 1 hour is subjected to relative permittivity (α) and dielectric loss tangent (β). ) May be used as a measurement sample.
The relative permittivity (α) and the dielectric loss tangent (β) can be measured according to the method described in Examples.
本発明のデバイス用硬化性接着シートは、前記接着剤層の他に、基材を有していてもよい。
基材としては、通常、樹脂フィルムを利用することができる。
樹脂フィルムの樹脂成分としては、ポリイミド、ポリアミド、ポリアミドイミド、ポリフェニレンエーテル、ポリエーテルケトン、ポリエーテルエーテルケトン、ポリオレフィン、ポリエステル、ポリカーボネート、ポリスルホン、ポリエーテルスルホン、ポリフェニレンスルフィド、ポリアリレート、アクリル系樹脂、シクロオレフィン系ポリマー、芳香族系重合体、ポリウレタン系ポリマー、液晶ポリマーフィルム等が挙げられる。
基材の厚さは、特に制限はないが、好ましくは10~500μm、より好ましくは10~300μm、さらに好ましくは15~200μmである。 [Curable adhesive sheet for devices]
The curable adhesive sheet for a device of the present invention may have a base material in addition to the adhesive layer.
As the base material, a resin film can usually be used.
The resin components of the resin film include polyimide, polyamide, polyamideimide, polyphenylene ether, polyether ketone, polyether ether ketone, polyolefin, polyester, polycarbonate, polysulfone, polyethersulfone, polyphenylene sulfide, polyarylate, acrylic resin, and cyclo. Examples thereof include olefin-based polymers, aromatic-based polymers, polyurethane-based polymers, and liquid crystal polymer films.
The thickness of the base material is not particularly limited, but is preferably 10 to 500 μm, more preferably 10 to 300 μm, and even more preferably 15 to 200 μm.
剥離フィルムは、デバイス用硬化性接着シートを使用するまでの間は、接着剤層の保護フィルムとして機能する。また、デバイス用硬化性接着シートが基材を有しないものである場合、剥離フィルムは、デバイス用硬化性接着シートの製造工程においては支持体として機能する。
なお、本発明のデバイス用硬化性接着シートを使用する際は、通常、剥離フィルムは剥離除去される。 The curable adhesive sheet for a device of the present invention may have a release film in addition to the adhesive layer.
The release film functions as a protective film for the adhesive layer until the curable adhesive sheet for the device is used. Further, when the curable adhesive sheet for a device does not have a base material, the release film functions as a support in the manufacturing process of the curable adhesive sheet for a device.
When the curable adhesive sheet for a device of the present invention is used, the release film is usually peeled off.
剥離フィルム用の基材としては、グラシン紙、コート紙、上質紙等の紙基材;これらの紙基材にポリエチレン等の熱可塑性樹脂をラミネートしたラミネート紙;ポリエチレンテレフタレート樹脂、ポリブチレンテレフタレート樹脂、ポリエチレンナフタレート樹脂、ポリプロピレン樹脂、ポリエチレン樹脂等のプラスチックフィルム;等が挙げられる。 As the release film, a conventionally known one can be used. For example, a base material for a release film having a release layer peeled with a release agent can be mentioned.
As the base material for the release film, paper base materials such as glassin paper, coated paper, and high-quality paper; laminated paper obtained by laminating a thermoplastic resin such as polyethylene on these paper base materials; polyethylene terephthalate resin, polybutylene terephthalate resin, etc. Plastic films such as polyethylene naphthalate resin, polypropylene resin, and polyethylene resin; and the like.
剥離フィルムの厚さは、特に制限はないが、通常20~250μm程度である。 Examples of the release agent include rubber-based elastomers such as silicone-based resins, olefin-based resins, isoprene-based resins, and butadiene-based resins, long-chain alkyl-based resins, alkyd-based resins, and fluorine-based resins.
The thickness of the release film is not particularly limited, but is usually about 20 to 250 μm.
したがって、本発明のデバイス用硬化性接着シートは、低誘電特性が求められるデバイス中の部材を形成する際に好適に用いられる。
例えば、本発明のデバイス用硬化性接着シートを用いることで、回路基板を構成する接着剤硬化物層を効率よく形成することができる。すなわち、本発明のデバイス用硬化性接着シートは、回路基板用硬化性接着シートとして用いることができる。回路基板としては、例えば、フレキシブルプリント配線板等が挙げられる。 As described above, the cured product of the adhesive layer of the curable adhesive sheet for devices of the present invention is excellent in low dielectric properties in the high frequency region.
Therefore, the curable adhesive sheet for devices of the present invention is suitably used when forming a member in a device that requires low dielectric properties.
For example, by using the curable adhesive sheet for devices of the present invention, the adhesive cured product layer constituting the circuit board can be efficiently formed. That is, the curable adhesive sheet for devices of the present invention can be used as a curable adhesive sheet for circuit boards. Examples of the circuit board include a flexible printed wiring board and the like.
・ポリフェニレンエーテル樹脂(A1):ビニルベンジル変性ポリフェニレンエーテル〔三菱ガス化学社製、商品名:OPE-2St 1200、数平均分子量:1200〕
・ポリフェニレンエーテル樹脂(A2):ビニルベンジル変性ポリフェニレンエーテル〔三菱ガス化学社製、商品名:OPE-2St 2200、数平均分子量:2200〕
・多官能性化合物(B1):イソシアヌレート骨格を有するジアリル化合物(四国化成工業社製、商品名:L-DAIC)
・環状エーテル基含有化合物(BX1):水添ビスフェノールA型エポキシ樹脂〔三菱ケミカル社製、商品名:YX8000、エポキシ当量:205g/eq、25℃で液体〕
・バインダー樹脂(C1):酸変性α-オレフィン重合体〔三井化学社製、商品名:ユニストールH-200、数平均分子量:47,000〕
・カチオン重合開始剤(D1):スルホニウム塩系熱カチオン重合開始剤〔三新化学社製、商品名:サンエイドSI-B3〕
・シランカップリング剤(E1):8-グリシドキシオクチルトリメトキシシラン〔信越化学工業社製、商品名:KBM4803〕 [Compounds used in Examples or Comparative Examples]
-Polyphenylene ether resin (A1): Vinyl benzyl-modified polyphenylene ether [manufactured by Mitsubishi Gas Chemical Company, trade name: OPE-2St 1200, number average molecular weight: 1200]
-Polyphenylene ether resin (A2): Vinyl benzyl-modified polyphenylene ether [manufactured by Mitsubishi Gas Chemical Company, trade name: OPE-2St 2200, number average molecular weight: 2200]
-Polyfunctional compound (B1): Dialyl compound having an isocyanurate skeleton (manufactured by Shikoku Chemicals Corporation, trade name: L-DAIC)
-Cyclic ether group-containing compound (BX1): hydrogenated bisphenol A type epoxy resin [manufactured by Mitsubishi Chemical Corporation, trade name: YX8000, epoxy equivalent: 205 g / eq, liquid at 25 ° C]
Binder resin (C1): Acid-modified α-olefin polymer [manufactured by Mitsui Chemicals, trade name: Unistor H-200, number average molecular weight: 47,000]
Cationic polymerization initiator (D1): Sulfonium salt-based thermal cationic polymerization initiator [manufactured by Sanshin Chemical Co., Ltd., trade name: Sun Aid SI-B3]
-Silane coupling agent (E1): 8-glycidoxyoctyltrimethoxysilane [manufactured by Shin-Etsu Chemical Co., Ltd., trade name: KBM4803]
ポリフェニレンエーテル樹脂(A1)50質量部、多官能性化合物(B1)10質量部、バインダー樹脂(C1)100質量部、カチオン重合開始剤(D1)0.5質量部、シランカップリング剤(E1)0.2質量部をトルエンに溶解し、接着剤組成物を調製した。
この接着剤組成物を剥離フィルム(第1剥離フィルム、リンテック社製、商品名:SP-PET752150)の剥離処理面上に塗工し、得られた塗膜を100℃で2分間乾燥し、厚さが15μmの接着剤層を形成した。この接着剤層上に、もう1枚の剥離フィルム(第2剥離フィルム、リンテック社製、商品名:SP-PET381130)の剥離処理面を貼り合わせて硬化性接着シート(熱硬化性接着シート)を得た。 [Example 1]
50 parts by mass of polyphenylene ether resin (A1), 10 parts by mass of polyfunctional compound (B1), 100 parts by mass of binder resin (C1), 0.5 parts by mass of cationic polymerization initiator (D1), silane coupling agent (E1) 0.2 parts by mass was dissolved in toluene to prepare an adhesive composition.
This adhesive composition is applied onto the peeling surface of the release film (first release film, manufactured by Lintec Corporation, trade name: SP-PET752150), and the obtained coating film is dried at 100 ° C. for 2 minutes to make it thicker. An adhesive layer having a size of 15 μm was formed. A release-treated surface of another release film (second release film, manufactured by Lintec Corporation, trade name: SP-PET381130) is bonded onto this adhesive layer to form a curable adhesive sheet (thermosetting adhesive sheet). Obtained.
接着剤組成物を構成する各成分の種類及び量を第1表に記載のものに変更したこと以外は、実施例1と同様にして、接着剤組成物及び熱硬化性接着シートを得た。 [Examples 2 to 6, Comparative Examples 1 to 4]
An adhesive composition and a thermosetting adhesive sheet were obtained in the same manner as in Example 1 except that the types and amounts of the components constituting the adhesive composition were changed to those shown in Table 1.
実施例又は比較例で得た熱硬化性接着シートの接着剤層を約1mmの厚さになるように複数枚積層し、剥離フィルム/約1mmの厚さの接着剤層/剥離フィルム、の構造の積層体を得た。この積層体を160℃で1時間加熱して、約1mmの厚さの接着剤層を硬化させた後、両側の剥離フィルムを剥離して、測定用試料を得た。
得られた測定用試料について、RFインピーダンス・マテリアルアナライザ(キーサイト社製、E4991A)を用いて、23℃、1GHzにおける比誘電率及び誘電正接を測定した。実施例又は比較例では、高周波領域の一例として1GHzを採用した。 [Relative permittivity, dielectric loss tangent]
A structure of a release film / an adhesive layer / a release film having a thickness of about 1 mm by laminating a plurality of adhesive layers of the thermosetting adhesive sheets obtained in Examples or Comparative Examples so as to have a thickness of about 1 mm. Was obtained. This laminate was heated at 160 ° C. for 1 hour to cure an adhesive layer having a thickness of about 1 mm, and then the release films on both sides were peeled off to obtain a sample for measurement.
The obtained measurement sample was measured for relative permittivity and dielectric loss tangent at 23 ° C. and 1 GHz using an RF impedance material analyzer (manufactured by Keysight Co., Ltd., E4991A). In the examples or comparative examples, 1 GHz was adopted as an example of the high frequency region.
実施例1~6で得られた硬化性接着シートの接着剤層の硬化物は、高周波領域での低誘電特性を有している。
一方、比較例1~4で得られた硬化性接着シートの接着剤層は、本発明の(B)成分の代わりに環状エーテル基を有する化合物を含有するため、これらの接着剤層の硬化物は、高周波領域での低誘電特性に劣っている。 The following can be seen from Table 1.
The cured product of the adhesive layer of the curable adhesive sheet obtained in Examples 1 to 6 has a low dielectric property in a high frequency region.
On the other hand, since the adhesive layers of the curable adhesive sheets obtained in Comparative Examples 1 to 4 contain a compound having a cyclic ether group instead of the component (B) of the present invention, the cured products of these adhesive layers. Is inferior in low dielectric properties in the high frequency region.
Claims (13)
- 下記(A)成分及び(B)成分を含有する接着剤層を有するデバイス用硬化性接着シート。
(A)成分:ビニル基を有するポリフェニレンエーテル樹脂
(B)成分:末端に二重結合を有する炭化水素基を2以上有する化合物 A curable adhesive sheet for a device having an adhesive layer containing the following components (A) and (B).
Component (A): Polyphenylene ether resin having a vinyl group (B) Component: A compound having two or more hydrocarbon groups having a double bond at the terminal. - 前記(B)成分が、複素環骨格を有する化合物である、請求項1に記載のデバイス用硬化性接着シート。 The curable adhesive sheet for a device according to claim 1, wherein the component (B) is a compound having a heterocyclic skeleton.
- 前記複素環骨格が、イソシアヌレート骨格又はグリコールウリル骨格である、請求項2に記載のデバイス用硬化性接着シート。 The curable adhesive sheet for a device according to claim 2, wherein the heterocyclic skeleton is an isocyanurate skeleton or a glycoluril skeleton.
- 前記(B)成分の分子量が、1,000以下である、請求項1~3のいずれかに記載のデバイス用硬化性接着シート。 The curable adhesive sheet for a device according to any one of claims 1 to 3, wherein the molecular weight of the component (B) is 1,000 or less.
- 前記(B)成分が有する、末端に二重結合を有する炭化水素基の数が2である、請求項1~4のいずれかに記載のデバイス用硬化性接着シート。 The curable adhesive sheet for a device according to any one of claims 1 to 4, wherein the component (B) has 2 hydrocarbon groups having a double bond at the end.
- 前記(B)成分が、下記式で表される化合物である、請求項1~5のいずれかに記載のデバイス用硬化性接着シート。
- 前記接着剤層が、オレフィン系樹脂をバインダー樹脂として含有するものである、請求項1~6のいずれかに記載のデバイス用硬化性接着シート。 The curable adhesive sheet for a device according to any one of claims 1 to 6, wherein the adhesive layer contains an olefin resin as a binder resin.
- 前記接着剤層が、反応性官能基を有する樹脂をバインダー樹脂として含有するものである、請求項1~7のいずれかに記載のデバイス用硬化性接着シート。 The curable adhesive sheet for a device according to any one of claims 1 to 7, wherein the adhesive layer contains a resin having a reactive functional group as a binder resin.
- 前記接着剤層が、さらに下記(D)成分を含有するものである、請求項1~8のいずれかに記載のデバイス用硬化性接着シート。
(D)成分:カチオン重合開始剤 The curable adhesive sheet for a device according to any one of claims 1 to 8, wherein the adhesive layer further contains the following component (D).
Component (D): Cationic polymerization initiator - 前記接着剤層が、環状エーテル基を有する化合物を含有する層、又は、環状エーテル基を有する化合物を含有しない層であって、環状エーテル基を有する化合物の含有量が接着剤層中5質量%未満である、請求項1~9のいずれかに記載のデバイス用硬化性接着シート。 The adhesive layer is a layer containing a compound having a cyclic ether group or a layer not containing a compound having a cyclic ether group, and the content of the compound having a cyclic ether group is 5% by mass in the adhesive layer. The curable adhesive sheet for a device according to any one of claims 1 to 9, which is less than.
- 前記接着剤層が、25℃において液体の化合物を含有する層であって、25℃において液体の化合物の含有量が、接着剤層中5質量%以上である、請求項1~10のいずれかに記載のデバイス用硬化性接着シート。 Any of claims 1 to 10, wherein the adhesive layer is a layer containing a liquid compound at 25 ° C., and the content of the liquid compound at 25 ° C. is 5% by mass or more in the adhesive layer. Curable adhesive sheet for devices as described in.
- 25℃において液体の化合物の少なくとも1種が、末端に二重結合を有する炭化水素基を2以上有する化合物である、請求項11に記載のデバイス用硬化性接着シート。 The curable adhesive sheet for a device according to claim 11, wherein at least one of the compounds liquid at 25 ° C. is a compound having two or more hydrocarbon groups having a double bond at the terminal.
- 末端に二重結合を有する炭化水素基を2以上有し、かつ、25℃において液体の化合物の含有量が、25℃において液体の化合物の全量中90質量%以上である、請求項12に記載のデバイス用硬化性接着シート。 12. According to claim 12, the content of the liquid compound at 25 ° C., which has two or more hydrocarbon groups having a double bond at the terminal, is 90% by mass or more based on the total amount of the liquid compound at 25 ° C. Curable adhesive sheet for devices.
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KR1020227033294A KR20220154130A (en) | 2020-03-13 | 2020-09-29 | Curable adhesive sheet for devices |
JP2021502911A JP6905160B1 (en) | 2020-03-13 | 2020-09-29 | Curable adhesive sheet for devices |
CN202080097786.7A CN115135736A (en) | 2020-03-13 | 2020-09-29 | Curable adhesive sheet for device |
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2020
- 2020-09-29 WO PCT/JP2020/036884 patent/WO2021181732A1/en active Application Filing
- 2020-09-30 TW TW109134104A patent/TW202140715A/en unknown
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2021
- 2021-05-25 JP JP2021087733A patent/JP6967171B2/en active Active
- 2021-10-22 JP JP2021172806A patent/JP2022009391A/en active Pending
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JP6967171B2 (en) | 2021-11-17 |
JP2021147621A (en) | 2021-09-27 |
TW202140715A (en) | 2021-11-01 |
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