WO2021020542A1 - 熱硬化性樹脂組成物、熱硬化性樹脂膜、熱硬化膜、積層体、ならびにプリント配線板およびその製造方法 - Google Patents
熱硬化性樹脂組成物、熱硬化性樹脂膜、熱硬化膜、積層体、ならびにプリント配線板およびその製造方法 Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/08—Processes
- C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
- C08L75/04—Polyurethanes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/29—Compounds containing one or more carbon-to-nitrogen double bonds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/75—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic
- C08G18/751—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring
- C08G18/752—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group
- C08G18/757—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing at least two isocyanate or isothiocyanate groups linked to the cycloaliphatic ring by means of an aliphatic group
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/34—Carboxylic acids; Esters thereof with monohydroxyl compounds
- C08G18/341—Dicarboxylic acids, esters of polycarboxylic acids containing two carboxylic acid groups
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/34—Carboxylic acids; Esters thereof with monohydroxyl compounds
- C08G18/348—Hydroxycarboxylic acids
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
- C08G18/44—Polycarbonates
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/67—Unsaturated compounds having active hydrogen
- C08G18/671—Unsaturated compounds having only one group containing active hydrogen
- C08G18/672—Esters of acrylic or alkyl acrylic acid having only one group containing active hydrogen
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/83—Chemically modified polymers
- C08G18/831—Chemically modified polymers by oxygen-containing compounds inclusive of carbonic acid halogenides, carboxylic acid halogenides and epoxy halides
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
- C08G73/06—Polycondensates having nitrogen-containing heterocyclic rings in the main chain of the macromolecule
- C08G73/08—Polyhydrazides; Polytriazoles; Polyaminotriazoles; Polyoxadiazoles
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G81/00—Macromolecular compounds obtained by interreacting polymers in the absence of monomers, e.g. block polymers
- C08G81/02—Macromolecular compounds obtained by interreacting polymers in the absence of monomers, e.g. block polymers at least one of the polymers being obtained by reactions involving only carbon-to-carbon unsaturated bonds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L25/00—Compositions of, homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Compositions of derivatives of such polymers
- C08L25/02—Homopolymers or copolymers of hydrocarbons
- C08L25/04—Homopolymers or copolymers of styrene
- C08L25/08—Copolymers of styrene
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L39/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen; Compositions of derivatives of such polymers
- C08L39/04—Homopolymers or copolymers of monomers containing heterocyclic rings having nitrogen as ring member
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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
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
- C09D175/16—Polyurethanes having carbon-to-carbon unsaturated bonds having terminal carbon-to-carbon unsaturated bonds
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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
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
- C09J175/06—Polyurethanes from polyesters
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/03—Use of materials for the substrate
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/03—Use of materials for the substrate
- H05K1/0313—Organic insulating material
- H05K1/0353—Organic insulating material consisting of two or more materials, e.g. two or more polymers, polymer + filler, + reinforcement
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
- H05K3/46—Manufacturing multilayer circuits
Definitions
- the present invention relates to a thermosetting resin composition, a thermosetting resin film, and a thermosetting film which are suitably used as an interlayer adhesive material in a multilayer printed wiring board. Furthermore, the present invention relates to a printed wiring board and a method for manufacturing the printed wiring board.
- the printed wiring boards inside the equipment have become more integrated and multi-layered.
- a method of multi-layering a printed wiring board a build-up method in which conductor layers (circuit patterns) and organic insulating layers are alternately stacked on a substrate material is attracting attention.
- An insulating interlayer adhesive is used for interlayer adhesion between the conductor layer and the organic insulating layer.
- the interlayer adhesive is required to have embedding property in a circuit pattern and strong adhesiveness to an organic insulating layer (polyimide, liquid crystal polymer, etc.) and a conductor forming a circuit (for example, copper).
- the frequency of signals is increasing.
- the dielectric constant is high
- the transmission speed is delayed and the signal waveform is disturbed, which makes circuit design difficult.
- the electric signal is converted into heat, and the electric signal is significantly attenuated especially when the dielectric loss is large in the GHz band. Therefore, it is required to reduce the dielectric constant and the low dielectric loss tangent of the interlayer adhesive material of the printed wiring board used in the high frequency band.
- a resin composition for an interlayer adhesive material using a specific material has been proposed in order to lower the dielectric constant and the low dielectric loss tangent of the interlayer adhesive material.
- a polyimide using a diamine containing a dimer diamine as a raw material is used to reduce the dielectric constant and the dielectric loss tangent of the adhesive layer.
- an object of the present invention is to provide a thermosetting resin composition in which the cured film has excellent dielectric properties and can be applied as an adhesive material having high heat resistance.
- thermosetting resin composition containing a carboxy group-containing compound as a component (A) and an oxazoline group-containing compound as a component (B).
- the component (A) is a compound having an imide group and a carboxy group in the molecule
- the component (B) is a polymer having a repeating unit represented by the following general formula (1).
- R 1 and R 2 are independently hydrogen atoms or methyl groups, respectively.
- R 3 is a hydrogen atom or an arbitrary substituent, and a plurality of R 3 may be bonded to form a ring structure. Ring structure in which a plurality of R 3 is formed by bonding, may be an aromatic ring.
- R 4 is a hydrogen atom or an alkyl group. m and n are each independently an integer of 1 or more, and m / n is preferably 1 to 50.
- the molar ratio of the total amount of carboxy groups in the composition to the amount of oxazoline groups of the component (B) is preferably 0.1 to 3.0.
- the acid value of the component (A) is preferably 5 to 200 mgKOH / g.
- the component (A) may be an oligomer having a weight average molecular weight of 1,000 to 30,000.
- the component (A) may have a carboxy group at the end of the molecular chain or may have a carboxy group in the side chain.
- the carboxy group of the side chain may be directly bonded to the main chain, or the carboxy group may be bonded to the main chain via another functional group.
- the component (A) may be a urethaneimide oligomer having a carboxy group at the terminal.
- the urethaneimide oligomer having a carboxy group at the terminal may also have a carboxy group in the side chain.
- the urethaneimide oligomer may have a urethane structural unit represented by the general formula (2) and a terminal structure represented by the general formula (3).
- R and X are independently divalent organic groups, and k is an integer of 1 or more.
- Y is a tetravalent organic group and is a tetracarboxylic dianhydride residue.
- R 5 is a hydrogen atom or an alkyl group.
- the urethaneimide oligomer may contain polycarbonate urethane in the urethane structure portion.
- the polycarbonate urethane contains a carbonate structure (O—CO—O) in the divalent organic group R of the above general formula (2).
- the thermosetting resin composition may contain a carboxy group-containing compound other than the component (A) as the component (C).
- the component (C) may be a compound containing an ethylenically unsaturated group.
- the component (C) may be a urethane (meth) acrylate having (meth) acryloyl groups at both ends of the molecular chain.
- the thermosetting resin composition may further contain fine particles.
- the average particle size of the fine particles is preferably 0.1 to 10 ⁇ m.
- the fine particles may act as a flame retardant such as a phosphorus compound.
- thermosetting resin composition may be provided as a solution. Further, the thermosetting resin composition may be provided as a thermosetting resin film formed in a layered (film-like) form. For example, by applying a thermosetting resin composition (solution) on a supporting base material and removing an organic solvent, a laminate having a thermosetting resin film is formed on the supporting base material.
- the supporting base material may be a metal foil such as a resin film or a copper foil.
- a cover film may be temporarily attached to the surface of the thermosetting resin film provided on the support base material.
- thermosetting film can be obtained by thermosetting the thermosetting resin film.
- a thermosetting resin film is laminated on the wiring provided on the substrate, and if necessary, an organic insulating layer, a conductor, a circuit board, etc. are laminated on the thermosetting resin film, and then the thermosetting resin film is heated. By curing, a printed wiring board is obtained.
- thermosetting film obtained by thermally curing the above thermosetting resin composition has a low dielectric constant and dielectric loss tangent, and is excellent in heat resistance. Therefore, the thermosetting resin composition and the thermosetting resin film can be suitably used as an interlayer adhesive material for a multilayer printed wiring board used in a high frequency band such as an antenna.
- thermosetting resin composition containing (A) a compound having an imide group and a carboxy group, and (B) a compound containing an oxazoline group.
- the thermosetting resin composition may further contain a carboxy group-containing compound other than the component (A) as the component (C).
- the thermosetting resin composition of the present embodiment exhibits thermosetting property because the oxazoline group of the component (B) reacts with the carboxy group of the component (A) (and the component (C)).
- thermosetting resin composition Unless otherwise specified, each of the following components may be used alone or in combination of two or more.
- the component (A) is a compound having at least one imide group and at least one carboxy group in one molecule.
- the acid value of the component (A) is preferably 5 to 200 mgKOH / g, more preferably 10 to 150 mgKOH / g, and even more preferably 15 to 100 mgKOH / g.
- the component (A) is preferably an oligomer having a weight average molecular weight of 1,000 to 30,000 in terms of polyethylene glycol.
- the weight average molecular weight of the oligomer is more preferably 2,000 to 25,000, and may be 3,000 to 20,000 or 5,000 to 15,000.
- the oligomer containing an imide group may have two or more imide groups in one molecule.
- the resin composition tends to have excellent stability and the heat resistance of the cured film obtained by thermosetting tends to be improved.
- the imide oligomer having a carboxy group include an imide oligomer having a carboxy group in the side chain and an imide oligomer having a carboxy group at the end.
- the carboxy group of the side chain may be directly bonded to the main chain, or the carboxy group may be bonded to the main chain via another functional group.
- the imide oligomer having a carboxy group in the side chain include an imidized polyamic acid obtained by a reaction between a diamine having a carboxy group and a tetracarboxylic acid dianhydride, and a reaction between a diamine and a tetracarboxylic acid dianhydride.
- An example thereof is an imide oligomer having a low imidization rate in which a part of the amic acid remains when the polyamic acid obtained in the above method is imidized.
- Examples of the imide oligomer having a carboxy group at the terminal include terminal acid-modified imide.
- tetracarboxylic acid dianhydride is added in excess of the equivalent of the diisocyanate compound to prepare an imide oligomer having a carboxylic acid anhydride group at the end, which is reacted with water and / or alcohol to make the terminal carboxylic acid anhydride.
- an imide compound having a carboxyl group at the terminal can be obtained.
- the imide oligomer having a carboxy group at the terminal may have a structural unit other than the imide group.
- the component (A) is preferably a terminal carboxylate urethaneimide oligomer.
- the terminal carboxylic acid urethaneimide oligomer has a repeating unit (urethane structural unit) represented by the following general formula (2), and has a structural unit represented by the following general formula (3) at at least one end.
- X and R are independently divalent organic groups, and k is an integer of 1 or more.
- Y is a tetravalent organic group and R 5 is a hydrogen atom or an alkyl group. That is, the terminal carboxylic acid urethaneimide oligomer is an oligomer having a urethane structure inside the molecular chain and having a ring-closed imide group and at least one carboxy group at at least one end.
- the terminal carboxylic acid urethaneimide oligomer contains, for example, a structural unit represented by the following general formula (4).
- p is an integer of 0 or more
- X, R and k are the same as the general formula (2)
- Y and R 5 are the same as the general formula (3).
- p is 0, the terminal structure of the general formula (3) is directly bonded to the terminal of the urethane structural unit represented by the general formula (2).
- the terminal carboxylic acid urethaneimide oligomer in which the terminal structure of the general formula (3) is directly bonded to both ends of the urethane structural unit represented by the general formula (2), that is, p 0 in the general formula (4).
- a compound having a structure at both ends is represented by the following general formula (5).
- the urethane terminal carboxylic acid urethaneimide oligomer having a urethane structure represented by the general formula (2) and a terminal structure represented by the general formula (3) is obtained by reacting, for example, an isocyanate terminal urethane oligomer with a tetracarboxylic acid dianhydride.
- the terminal acid anhydride urethaneimide oligomer is synthesized and reacted with water and / or alcohol to open the ring of the terminal carboxylic acid anhydride group.
- the isocyanate-terminated urethane oligomer (urethane prepolymer) is obtained by reacting a diol compound and a diisocyanate compound at a ratio in which the diisocyanate compound becomes excessive.
- the diol compound is represented by the general formula R (OH) 2 .
- R is a divalent organic group.
- Specific examples of the diol compound include ethylene glycol, diethylene glycol, propylene glycol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, neopentyl glycol, 3-methyl-1,5-pentane.
- thermosetting resin composition thermosetting resin film
- embedding property between wirings is improved
- the conductor metal and the organic insulating layer are separated from each other. Adhesion tends to improve.
- the polycarbonate diol is represented by the following general formula (6).
- R 7 is a divalent organic group
- k is an integer of 1 or more, and 20 or less is preferable.
- Examples of commercially available polycarbonate diols include Asahi Kasei's “Duranol” series, Daicel Chemical Industries'"Plaxel” CD series, Kuraray's “Kuraray polyol” C series, and Tosoh's "Nipporan” 900 series. .. From the viewpoint of adjusting the molecular weight of the urethaneimide oligomer to an appropriate range, the polystyrene-equivalent number average molecular weight of the polycarbonate diol is preferably 750 to 5,000, more preferably 800 to 2,500.
- a carboxy group can be introduced into the side chain of the terminal carboxylic acid urethaneimide oligomer.
- a polycarbonate diol and a carboxy group-containing diol may be used in combination.
- the diisocyanate compound is a compound represented by the general formula X (NCO) 2 .
- X is a divalent organic group, which may be aromatic or aliphatic.
- diisocyanate compound examples include diphenylmethane-2,4'-diisocyanate, 3,2'-, 3,3'-, 4,2'-, 4,3'-, 5,2'-, 5,3. '-, 6,2'-or 6,3'-dimethyldiphenylmethane-2,4'-diisocyanate, 3,2'-, 3,3'-, 4,2'-, 4,3'-, 5, 2'-, 5,3'-, 6,2'-or 6,3'-diethyldiphenylmethane-2,4'-diisocyanate, 3,2'-, 3,3'-, 4,2'-, 4 , 3'-, 5,2'-, 5,3'-, 6,2'-or 6,3'-dimethoxydiphenylmethane-2,4'-diisocyanate, diphenylmethane-4,4'-diisocyanate, diphenylmethane-3 , 3'-diisocyan
- Aromatic diisocyanate compounds such as hydrogenated diphenylmethane diisocyanate, hydrogenated xylylene diisocyanate, isophorone diisocyanate, norbornene diisocyanate; aliphatic diisocyanate compounds such as hexamethylene diisocyanate, trimethylhexamethylene diisocyanate and lysine diisocyanate. Be done.
- isocyanate compound blocked isocyanate in which the isocyanate group is blocked with a protective group such as alcohol, phenol, lactam, or oxime may be used.
- diphenylmethane-4,4'-diisocyanate diphenylmethane-4,4'-diisocyanate, diphenylmethane-3,3'-diisocyanate, diphenylmethane-3,4'-diisocyanate, tolylen-2, from the viewpoint of improving the heat resistance of the thermocured film 4-Diisocyanate, tolylen-2,6-diisocyanate and norbornene diisocyanate are particularly preferable.
- a urethane oligomer having an isocyanate group at the terminal By reacting the diol compound and the diisocyanate compound at a ratio in which the diisocyanate compound becomes excessive, a urethane oligomer having an isocyanate group at the terminal can be obtained.
- the compounding ratio of the diol compound and the diisocyanate compound may be such that the ratio of the number of isocyanate groups to the number of hydroxyl groups (isocyanate group / hydroxyl group) is larger than 1.
- the isocyanate group / hydroxyl group ratio is preferably 1.1 to 2.0, more preferably 1.15 to 1.8, and even more preferably 1.2 to 1.6.
- the isocyanate group / hydroxyl group ratio is 1 or less, the terminal isocyanate ratio is low.
- the reaction does not proceed any further when diisocyanate is bonded to both ends of one molecule of diol, so that the molecular weight of the oligomer does not increase and the heat resistance and strength of the thermosetting film are improved. There may be a shortage.
- the reaction with the diisocyanate compound may be carried out after mixing the two or more kinds of diol compounds, or each diol compound and the diisocyanate compound may be reacted separately. After reacting the diol compound with the diisocyanate compound, the obtained terminal isocyanate compound may be further reacted with another diol compound, which may be further reacted with the diisocyanate compound. The same applies when two or more kinds of diisocyanate compounds are used.
- the reaction temperature of the diol and the diisocyanate is preferably 40 to 160 ° C, more preferably 60 to 150 ° C. If the temperature is lower than 40 ° C, the reaction time becomes long, and if the temperature exceeds 160 ° C, a three-dimensional reaction occurs during the reaction and gelation is likely to occur. The reaction time may be adjusted as appropriate. If necessary, the reaction may be carried out in the presence of a catalyst such as a tertiary amine, an alkali metal, an alkaline earth metal, a metal such as tin, zinc, titanium or cobalt, or a metalloid compound.
- a catalyst such as a tertiary amine, an alkali metal, an alkaline earth metal, a metal such as tin, zinc, titanium or cobalt, or a metalloid compound.
- Diol and diisocyanate react even without a solvent, but from the viewpoint of reaction control, it is preferable to react in an organic solvent.
- organic solvent those capable of dissolving diols and diisocyanates and dissolving urethane oligomers obtained by the reaction can be used without particular limitation.
- the amount of solvent is preferably adjusted so that the solute concentration in the reaction solution is 5 to 90% by weight.
- the solute concentration in the reaction solution is more preferably 10 to 80% by weight or less.
- the isocyanate-terminated urethane oligomer may block the isocyanate group at the terminal with a protecting group such as alcohol, lactam, or oxime.
- urethaneimide oligomer having an imide group and an acid anhydride group at the terminal is obtained.
- the tetracarboxylic dianhydride is represented by the following general formula (7).
- the urethaneimide oligomer produced by the reaction of tetracarboxylic dianhydride at both ends of the isocyanate-terminated urethane oligomer is represented by the following general formula (8).
- Y in the general formulas (7) and (8) is a tetravalent organic group and is a tetracarboxylic dianhydride residue.
- the acid anhydride-terminated urethaneimide oligomer may have an acid anhydride group at at least one end. Further, the acid anhydride-terminated urethaneimide oligomer may contain an imide bond not only at the terminal but also inside the molecular chain (a portion other than the terminal).
- an isocyanate-terminated urethaneimide oligomer further reacts with one or both acid dianhydride ends of the compound represented by the general formula (8) to form a molecular chain having an imide bond inside the molecular chain.
- a tetracarboxylic dianhydride is bonded to the isocyanate terminal to introduce an imide group and an acid anhydride group to the terminal.
- tetracarboxylic dianhydride examples include 3,3', 4,4'-benzophenonetetracarboxylic dianhydride, pyromellitic dianhydride, and 3,3', 4,4'-oxydiphthalic dianhydride.
- tetracarboxylic dianhydrides 2,2-bis [4- (3, 3,) from the viewpoint of improving the solubility of the terminal carboxylic acid urethaneimide oligomer in an organic solvent and improving the heat resistance of the heat-cured film.
- 4-Dicarboxyphenoxy) phenyl] propane dianhydride, 3,3', 4,4'-diphenylsulfonetetracarboxylic dianhydride, 3,3', 4,4'-oxydiphthalic acid dianhydride are preferred.
- thermosetting resin composition 2,2-bis [4- (3,4-dicarboxyphenoxy) phenyl] propanedianhydride or 5- (2, 5-Dioxotetrahydro-3-furanyl) -3-methyl-3-cyclohexene-1,2-dicarboxylic acid anhydride is preferred.
- the molar ratio of the acid dianhydride group to the isocyanate group is greater than 1 and not more than 2.10. Is preferable.
- the ratio of the acid dianhydride group / isocyanate group is larger than 1, it is easy to obtain a compound in which both ends of the urethane oligomer are modified with the tetracarboxylic dianhydride.
- the acid dianhydride group / isocyanate group ratio is 2.1 or less, the residual amount of unreacted tetracarboxylic dianhydride can be reduced.
- the acid dianhydride group / isocyanate group ratio is more preferably 1.1 to 2.1, and even more preferably 1.9 to 2.1.
- the reaction between the isocyanate-terminated urethane oligomer and the tetracarboxylic dianhydride is preferably carried out in an organic solvent.
- the solvent used for preparing the isocyanate-terminated urethane oligomer may be used as it is, or a solvent may be further added for the purpose of adjusting the solid content concentration or the like.
- the reaction between the isocyanate-terminated urethane oligomer and the tetracarboxylic acid dianhydride is particularly effective if the isocyanate group at the terminal of the urethane oligomer and the acid anhydride group of the tetracarboxylic acid dianhydride can form an imide bond by decarbonation. Not limited. As a typical method, the following methods 1 to 3 can be mentioned.
- Method 1 A solution in which tetracarboxylic dianhydride is dispersed or dissolved in an organic solvent is heated to 100 to 300 ° C., and an isocyanate-terminated urethane oligomer is added thereto. Under heating, it is preferable that the reaction proceeds substantially at the same time as the addition of the isocyanate-terminated urethane oligomer to promote decarboxylation imidization.
- the heating temperature is more preferably 140 to 250 ° C.
- Method 2 At a low temperature (for example, less than 100 ° C.), the isocyanate-terminated urethane oligomer and the tetracarboxylic dianhydride are mixed and completely dissolved, and then the temperature of the solution is 100 to 300 ° C., preferably 140 to 250 ° C. As a result, decarboxylation imidization is performed.
- a low temperature for example, less than 100 ° C.
- Method 3 A terminal isocyanate compound is gradually added and dissolved in a solution in which tetracarboxylic dianhydride is dispersed or dissolved in an organic solvent. Decarboxylation imidization is performed by reducing the pressure while heating the uniformly dissolved solution to 100 to 250 ° C., preferably 140 to 250 ° C.
- the alcohol a primary alcohol or a secondary alcohol is used, and the alkyl group preferably has 1 to 4 carbon atoms.
- Specific examples of the alcohol include methanol, ethanol, propanol, butanol, and isopropanol.
- the reaction between the terminal acid anhydride urethaneimide oligomer and water and / or alcohol is, for example, the amount of tetracarboxylic acid dianhydride in which water and / or alcohol is used for the terminal modification of the terminal acid anhydride urethaneimide oligomer. It may be added in an amount of 2 to 300 mol times, preferably 2 to 200 mol times.
- the reaction it is preferable to heat the added water and / or alcohol in a range where it does not volatilize outside the reaction system, and the reaction temperature is preferably 20 to 150 ° C, more preferably 30 to 120 ° C. From the viewpoint of promoting the reaction, it is preferable to add a large amount of water and / or alcohol, but if the amount added is too large, the solubility of other resin components due to the influence of water and / or alcohol remaining in the solution. May decrease. Therefore, it is preferable to remove the unreactant after the reaction.
- the terminal of the isocyanate-terminated urethane oligomer is imidized using tetracarboxylic dianhydride, but the terminal modification may be performed with both terminal acid anhydride imide oligomers.
- the biterminal acid anhydride imide oligomer has a structure represented by the following general formula (9).
- Y is a tetravalent organic group and is a tetracarboxylic dianhydride residue.
- Z is a divalent organic group, which is a diamine residue or a diisocyanate residue.
- p is an integer of 1 or more, preferably 20 or less, and may be 15 or less or 10 or less. If p is excessively large, the solubility of the imide oligomer in an organic solvent and the flexibility of the membrane may decrease.
- the biterminal acid anhydride imide oligomer represented by the general formula (9) can be prepared, for example, by preparing a polyamic acid oligomer by a reaction between a diamine and a tetracarboxylic dianhydride and performing imidization by heating. ..
- a tetracarboxylic dianhydride for example, the above-mentioned ones are preferably used.
- diamine various diamines used for preparing polyimide can be used without particular limitation.
- the ratio of tetracarboxylic dianhydride to diamine is preferably 1.1 to 2.1, more preferably 1.2 to 2.0. The closer the tetracarboxylic dianhydride / diamine ratio is to 1, the larger p tends to be, and the larger the tetracarboxylic dianhydride / diamine ratio is, the smaller p tends to be. Tetracarboxylic dianhydride / diamine When the ratio of 2 is exceeded, p approaches 1.
- Both terminal acid anhydride imide oligomers can also be prepared by the reaction of tetracarboxylic dianhydride and diisocyanate.
- a urethaneimide oligomer having a structure represented by the general formula (4) (where p is an integer of 1 or more) can be obtained.
- the oxazoline group-containing polymer as the component (B) has a repeating unit represented by the following general formula (1).
- R 1 and R 2 in the general formula (1) are independently hydrogen atoms or methyl groups, respectively.
- R 3 is a hydrogen atom or an arbitrary substituent, and a plurality of R 3 may be bonded to form a ring structure.
- Structural units in which a plurality of R 3 formed by bonding may be an aromatic ring.
- R 4 is a hydrogen atom or an alkyl group.
- the block structure is described for convenience, but the arrangement of the oxazoline group-containing unit and the aromatic ring-containing unit may be random.
- the oxazoline group-containing unit in the general formula (1) reacts with the carboxy group of the component (A), and thus contributes to thermosetting.
- the aromatic ring-containing unit in the general formula (1) contributes to lowering the dielectric constant and lowering the dielectric loss tangent of the thermosetting film.
- thermosetting film By reacting the oxazoline group with the carboxy group of the component (A) and the component (C) described later, the heat resistance of the thermosetting film is improved, and the residual amount of the carboxy group in the film is also low. Contributes to dielectric constant and low dielectric loss tangent.
- the reaction between the epoxy group and the carboxy group produces a hydroxyl group, whereas the reaction between the oxazoline group and the carboxy group does not generate a hydroxyl group. Therefore, the thermosetting product obtained by reacting the oxazoline group-containing compound with the carboxy group-containing compound has a small polarizability of the polymer and is effective for lowering the dielectric constant.
- m / n in the general formula (1) is preferably 1 or more, more preferably 5 or more, further preferably 10 or more, and 15 or more, 20 or more, or 25 or more. There may be.
- m / n is preferably 50 or less, more preferably 45 or less, and may be 40 or less, 35 or less, or 30 or less.
- the polymer represented by the general formula (1) is obtained by copolymerization of a polymerizable compound containing an aromatic ring and a polymerizable compound containing an oxazoline group. If the polymerizable functional group with a compound which is a vinyl group, alpha-position of the substituents R 1, R 2 is a hydrogen atom, if the polymerizable functional group with a compound which is an isopropenyl group, alpha-position of the Substituents R 1 and R 2 are methyl groups.
- Examples of the polymerizable compound containing an aromatic ring include styrene, ⁇ -methylstyrene, 1-vinylnaphthalene, 2-vinylnaphthalene, 1-isopropenylnaphthalene, 2-isopropenylnaphthalene and the like.
- Examples of the polymerization unit containing an oxazoline group include 2-vinyl-2-oxazoline, 2-vinyl-4-methyl-2-oxazoline, 2-vinyl-5-methyl-2-oxazoline, 2-isopropenyl-2-oxazoline, and the like. Examples thereof include 2-isopropenyl-4-methyl-2-oxazoline and 2-isopropenyl-5-ethyl-2-oxazoline.
- the weight average molecular weight of the oxazoline group-containing polymer is, for example, 10,000 to 500,000. From the viewpoint of the solubility of the polymer in an organic solvent and the tackiness of the coating film of the thermosetting resin composition, the weight average molecular weight of the oxazoline group-containing polymer is more preferably 30,000 to 400,000, and 50,000. It is more preferably from 300,000 to 70,000 to 250,000 or 100,000 to 200,000.
- the amount of the component (B) in the thermosetting resin composition is based on 100 parts by mass of the solid content of the component (A) from the viewpoints of lowering the dielectric constant and the low dielectric loss tangent of the thermosetting film and heat resistance. It is preferably 50 to 7000 parts by mass, more preferably 100 to 3000 parts by mass, further preferably 130 to 1000 parts by mass, and may be 150 to 700 parts by mass or 170 to 500 parts by mass.
- the ratio of the amount of the oxazoline group of the component (B) to the total amount of the carboxy group in the composition is 0.1 to 3. It is preferable to adjust it so that it becomes 0.0.
- the amount of carboxy groups in the composition is the amount of carboxy groups contained in the above component (A), and when the composition contains the following component (C), the amount of carboxy groups contained in the component (A) And (C) is the total amount of carboxy groups contained in the component.
- the ratio of the carboxy group / oxazoline group in the thermosetting resin composition is more preferably 0.3 to 2.5, further preferably 0.5 to 2.0, and 0.7 to 1.8 or 0.9 to 0.9. It may be 1.6.
- the thermosetting resin composition may contain a carboxy group-containing compound other than the above component (A) as the component (C).
- the component (C) contributes to thermosetting by reacting with the oxazoline group of the component (B) together with the component (A).
- the weight average molecular weight of the component (C) in terms of polyethylene glycol is preferably 1,000 to 30,000, 2. It is more preferably 000 to 25,000, and may be 3,000 to 20,000 or 5,000 to 15,000.
- the imide oligomer may have two or more imide groups in one molecule.
- the acid value of the component (C) is preferably 3 to 200 mgKOH / g, more preferably 5 to 100 mgKOH / g, and may be 7 to 70 mgKOH / g or 10 to 50 mgKOH / g.
- the acid value of the component (C) is preferably smaller than the acid value of the component (A).
- the acid value of the component (C) may be 0.05 to 0.8 times, 0.1 to 0.7 times, or 0.15 to 0.6 times the acid value of the component (A).
- the component (C) may have a carboxy group in the side chain, a carboxy group at the terminal, or a carboxy group in both the side chain and the terminal. From the viewpoint of enhancing the resin embedding property between the wirings, the component (C) preferably has a carboxy group in the side chain and no carboxy group at the end.
- the carboxy group of the component (C) reacts with the oxazoline group of the component (B).
- the component (C) does not have a carboxy group at the terminal, the terminal of the component (C) does not react during heating by thermosetting, and the motility of the molecular chain is ensured. Therefore, the component (C) acts like a plasticizer to lower the apparent glass transition temperature, and the resin composition has high fluidity even at a low temperature, which is one of the factors for improving the embedding property between wirings. Conceivable.
- the component (C) may have an ethylenically unsaturated group in addition to the carboxy group.
- Ethylene unsaturated groups include (meth) acryloyl groups and vinyl groups.
- (meth) acrylic means acrylic or methacrylic
- (meth) acryloyl means acryloyl or methacryloyl.
- the component (C) Since the component (C) has an ethylenically unsaturated group at the end, the wiring embedding property of the thermosetting film tends to be improved. In particular, when a compound having ethylenically unsaturated groups at both ends is used as the component (C), the wiring embedding property tends to be improved.
- a (meth) acryloyl group is preferable.
- an acid-modified epoxy (meth) obtained by adding a saturated or unsaturated polyvalent carboxylic acid anhydride to an ester obtained by reacting an epoxy resin with an unsaturated monocarboxylic acid.
- Examples of commercially available epoxy (meth) acrylate products having a carboxy group include KAYARAD ZFR series, ZAR series, ZCR series, CCR series, PCR series, and UXE series manufactured by Nippon Kayaku.
- Examples of commercially available urethane (meth) acrylates having a carboxy group include the UX series manufactured by Nippon Kayaku.
- Examples of commercially available (meth) acrylic (meth) acrylate products include the Cyclomer ACA series manufactured by Daicel Cytec.
- Urethane (meth) acrylate is particularly preferable as the component (C) from the viewpoint of improving wiring embedding property and adhesiveness.
- the amount of the component (C) is 0.5 mass by mass with respect to 100 parts by mass of the solid content of the component (A) from the viewpoint of improving the wiring embedding property. It is preferably 3 parts or more, more preferably 1 part by mass or more, and may be 3 parts by mass or more or 5 parts by mass or more.
- the amount of the component (C) is 100% by mass with respect to 100 parts by mass of the solid content of the component (A). It is preferably parts or less, more preferably 50 parts by mass or less, further preferably 30 parts by mass or less, and may be 25 parts by mass or less or 20 parts by mass or less.
- thermosetting resin composition is substantially free of a photopolymerization initiator and a thermal polymerization initiator.
- thermosetting resin composition Since the thermosetting resin composition is cured by heating, it is not necessary to include a photopolymerization initiator for photocuring. Since the thermosetting resin composition does not substantially contain a photopolymerization initiator, it is possible to suppress the reaction of ethylenically unsaturated groups caused by light in the storage environment (for example, ultraviolet rays of a fluorescent lamp), and the thermosetting resin. The storage stability of the composition can be improved. Further, by not performing photo-curing after the thermosetting of the resin composition, a part or all of the ethylenically unsaturated group of the component (C) remains unreacted, so that the flexibility of the film is ensured.
- a photopolymerization initiator for photocuring. Since the thermosetting resin composition does not substantially contain a photopolymerization initiator, it is possible to suppress the reaction of ethylenically unsaturated groups caused by light in the storage environment (for example, ultraviolet rays of a fluorescent lamp), and the thermosetting resin. The storage
- a small amount of the photopolymerization initiator used for the polymerization of the above-mentioned components (A) to (C) and the later-described component (D) may remain in the thermosetting resin composition, but the storage stability of the composition And from the viewpoint of film flexibility, it is preferable that the amount of the photopolymerization initiator in the composition is small.
- the content of the photopolymerization initiator with respect to 100 parts by mass of the total solid content of the thermosetting resin composition is preferably less than 0.05 parts by mass, more preferably less than 0.01 parts by mass, and 0.001. Less than parts by mass is more preferable, and it may be less than 0.0005 parts by mass, less than 0.0001 parts by mass, or 0.
- thermosetting resin composition does not substantially contain a thermopolymerization initiator that promotes thermosetting of ethylenically unsaturated groups, such as a thermal radical initiator and a thermal cation initiator.
- a thermopolymerization initiator that promotes thermosetting of ethylenically unsaturated groups
- thermosetting a resin composition that substantially does not contain a thermal polymerization initiator is less likely to undergo curing shrinkage due to heating when bonded to a conductor layer (circuit pattern) or an organic insulating layer, and is a substrate. Warpage tends to be suppressed.
- thermosetting resin composition does not substantially contain the thermosetting initiator, the reaction of ethylenically unsaturated groups due to heat in the storage environment can be suppressed, and the storage stability of the thermosetting resin composition can be suppressed. Can be improved.
- thermosetting resin composition containing a (meth) acryloyl group-containing compound contains a thermal polymerization initiator and has a heat curing rate by promoting radicalization or cationization of the (meth) acryloyl group. Is increasing.
- the carboxy group of the component (A) and the carboxy group of the component (C) reacts with the oxazoline group of the component (B) to proceed with curing. Therefore, even if the composition does not contain a thermal polymerization initiator and the reaction by radicalization or cationization of the ethylenically unsaturated group of the component (C) does not proceed, the composition is thermoset.
- the reaction rate of an ethylenically unsaturated group such as a (meth) acryloyl group due to thermal energy is the carboxy of the components (A) and (C). It is smaller than the reaction rate between the group and the oxazoline group of the component (B). Therefore, when the thermosetting resin composition does not substantially contain the thermosetting initiator, the reaction of the carboxy group of the component (C) proceeds preferentially by heating, and the component (C) occurs during the thermosetting. Since a part or all of the ethylenically unsaturated groups of the above remains unreacted, the fluidity is high and it can contribute to the improvement of the resin embedding property between the wirings.
- a thermal polymerization initiator such as a peroxide
- the amount of the thermal polymerization initiator in the composition is small.
- the content of the thermosetting initiator with respect to 100 parts by mass of the total solid content of the thermosetting resin composition is preferably less than 0.05 parts by mass, more preferably less than 0.01 parts by mass, and 0.001. Less than parts by mass is more preferable, and it may be less than 0.0005 parts by mass, less than 0.0001 parts by mass, or 0.
- thermosetting resin composition is thermosetting by reacting the oxazoline group of the component (B) with the carboxy group of the component (A) (and the component (C)).
- the thermosetting resin composition may contain a compound having reactivity with a carboxy group in addition to the component (B).
- an epoxy resin may be contained as the component (D).
- Epoxy resins are involved in thermosetting reactions because they are reactive with carboxy groups.
- the thermosetting resin composition contains an epoxy resin as the component (D)
- the heat resistance of the thermosetting film and the reliability of electrical insulation may be improved.
- the epoxy resin is a resin having at least one epoxy group in the molecule, and may contain two or more epoxy groups from the viewpoint of improving the heat resistance of the cured film and the reliability of electrical insulation.
- the epoxy resin bisphenol A type epoxy resin, bisphenol F type epoxy resin, bisphenol S type epoxy resin, hydrogenated bisphenol A type epoxy resin, biphenyl type epoxy resin, phenoxy type epoxy resin, naphthalene type epoxy resin, phenol novolac type epoxy Examples thereof include resins, cresol novolac type epoxy resins, trisphenol methane type epoxy resins, dicyclopentadiene type epoxy resins, and amine type epoxy resins.
- the epoxy resin may be a modified epoxy resin such as urethane, rubber, chelate, or dimer acid.
- a commercially available epoxy resin may be used as the component (D).
- the content of the epoxy resin in the thermosetting resin composition is small.
- the content of the epoxy resin in the thermosetting resin composition is preferably 100 parts by mass or less, more preferably 50 parts by mass or less, and further preferably 30 parts by mass or less with respect to 100 parts by mass of the solid content of the component (A). It is preferably 15 parts by mass or less, and may be 10 parts by mass or less or 5 parts by mass or less.
- the thermosetting resin composition may not contain an epoxy resin.
- the thermosetting resin composition has 1 part by mass or more and 3 parts by mass or more or 5 parts by mass with respect to 100 parts by mass of the solid content of the component (A). It may contain more than a mass part of epoxy resin.
- the content of the epoxy resin in the thermosetting resin composition is preferably 50 parts by mass or less, more preferably 30 parts by mass or less, and further 20 parts by mass or less with respect to 100 parts by mass of the solid content of the component (B). It is preferably 15 parts by mass or less, and may be 10 parts by mass or less or 5 parts by mass or less.
- the ratio of the amount of epoxy groups (epoxy group / oxazoline group) to the amount of oxazoline group of component (B) in the thermosetting resin composition is preferably 2 or less, more preferably 1 or less, and further preferably 0.5 or less. Preferably, it may be 0.3 or less, 0.1 or less, or 0.05 or less.
- the ratio of the amount of epoxy groups (epoxy group / carboxy group) to the total amount of carboxy of epoxy groups in the thermosetting resin composition is preferably less than 1, more preferably 0.7 or less, and further preferably 0.5 or less. Preferably, it may be 0.3 or less, 0.1 or less, or 0.05 or less.
- the thermosetting resin composition of the present embodiment may contain a solid content other than the above components (A) to (D).
- the other component may be a resin component other than the above components (A) to (D), and may or may not have thermosetting property. From the viewpoint of lowering the dielectric constant and lowering the dielectric loss tangent of the thermosetting film, it is preferable that the content of the resin component other than (A) to (D) is small.
- the amount of the resin component other than the components (A) to (D) is preferably 100 parts by mass or less, more preferably 50 parts by mass or less, and 30 parts by mass with respect to 100 parts by mass of the total of the components (A) to (D). It is more preferably 20 parts by mass or less, and may be 10 parts by mass or less or 5 parts by mass or less.
- the thermosetting resin composition of the present embodiment may contain fine particles.
- the fine particles include an inorganic filler, a flexibility imparting agent, a flame retardant and the like. By including the fine particles, it is possible to control the fluidity of the thermosetting resin composition, improve the heat resistance and flame retardancy of the thermosetting film, improve the insulation reliability, reduce the coefficient of linear expansion, and the like.
- Materials for the inorganic filler include alumina, aluminum hydroxide, magnesium hydroxide, calcium carbonate, magnesium carbonate, calcium silicate, magnesium silicate, calcium oxide, magnesium oxide, aluminum oxide, aluminum nitride, crystalline silica, and amorphous.
- examples thereof include non-metallic inorganic fillers such as calcium, boron nitride, titania, glass, iron oxide, and ceramics.
- Materials for the flexibility-imparting agent include various synthetic rubbers such as acrylic rubber, acrylonitrile butadiene rubber, and carboxy-containing acrylonitrile butadiene rubber, rubber-modified high-molecular-weight compounds, modified polyimides, modified polyamideimides, polyurethane resins, polyester resins, and polyurethane polyesters. Examples thereof include resins, polyvinyl butyral resins, polyvinyl acetacetal resins, and phenoxy resins.
- Examples of the material of the flame retardant include a phosphorus atom-containing compound, a nitrogen atom-containing compound, and an inorganic flame retardant compound. More specifically, trimethyl phosphate, triethyl phosphate, tributyl phosphate, tri-2-ethylhexyl phosphate, tributoxyethyl phosphate, triphenyl phosphate, tricresyl phosphate, trixylenyl phosphate, cresildiphenyl phosphate, xylenyl diphenyl.
- Phosphate esters such as phosphate, 2-ethylhexyldiphenyl phosphate, tris (2,6 dimethylphenyl) phosphate, resorcindiphenyl phosphate; condensed phosphorus such as ammonium polyphosphate, polyphosphate amide, red phosphorus, guanidine phosphate, dialkylhydroxymethylphosphonate Examples thereof include acid ester compounds; nitrogen atom-containing compounds such as melamine; and inorganic flame-retardant compounds such as aluminum hydroxide, magnesium hydroxide, zinc borate, and calcium borate.
- the average particle size of the fine particles is preferably 0.1 to 10 ⁇ m, more preferably 0.1 to 5 ⁇ m. If the average particle size exceeds 10 ⁇ m, the fine particles tend to settle in the composition (solution), or the depth of the wiring circuit pattern may be exceeded, causing poor adhesion or the like. When the average particle size is less than 0.1 ⁇ m, the fine particles tend to aggregate, which may cause a decrease in coatability due to an increase in the solution viscosity of the thermosetting resin composition.
- the amount of fine particles in the thermosetting resin composition is preferably 1 to 100 parts by mass, more preferably 3 to 50 parts by mass, based on 100 parts by mass of the solid content of the component (A).
- the amount of fine particles in the thermosetting resin composition is preferably 3 to 50 parts by mass, more preferably 5 to 40 parts by mass, based on 100 parts by mass of the total solid content of the components (A) to (D).
- the amount of fine particles with respect to 100 parts by mass of the total solid content of the components (A) to (D) is preferably 30 parts by mass or less, preferably 20 parts by mass. The following is more preferable.
- thermosetting resin composition may contain various additives such as an adhesive aid, an antifoaming agent, a leveling agent, a colorant, and a polymerization inhibitor.
- the content of the additive may be appropriately set.
- thermosetting resin composition can be prepared by mixing the above-mentioned components (A) and (B), and if necessary, the components (C), (D) and (E).
- the components (A) to (E) are preferably mixed in an organic solvent.
- the organic solvent is not particularly limited as long as it can dissolve the resin component.
- the organic solvent used for preparing the components (A) to (E) may be used as it is as a solvent for the thermosetting resin composition.
- the component (B) is previously dissolved in an organic solvent and mixed with other components.
- organic solvent for dissolving the component (B) include diethylene glycol monoethyl ether acetate (also known as carbitol acetate), 2-methoxy-1-methyl ethyl acetate, methyl ethyl ketone, acetone, 1,3-dioxolane, and toluene. ..
- the mixing order of the components (A) to (E) is not particularly limited, and all the components may be mixed at the same time.
- a method of uniformly mixing the composition a method using a kneading device such as a three-roll or bead mill is preferable. If the viscosity of the solution is low, it may be mixed using a general stirring device.
- thermosetting resin film (B stage film) A thermosetting resin film (B stage film) can be obtained by applying the thermosetting resin composition on a supporting base material (carrier film) and removing the organic solvent by heating or the like.
- the thickness of the supporting base material is not particularly limited, but is generally about 10 to 150 ⁇ m.
- the supporting base material may be subjected to surface treatment such as mud treatment, corona treatment, and mold release treatment.
- a resin film is used as the supporting base material.
- the material of the resin film include polyolefins such as polyethylene, polypropylene and polyvinyl chloride, polyesters such as polyethylene terephthalate and polyethylene naphthalate, polyimide and polycarbonate.
- the supporting base material may be a metal foil such as copper foil or a paper pattern.
- the resin film has both a role as an adhesive layer and a role as an insulating layer, so that the thickness and weight can be reduced. It is advantageous.
- the thermosetting resin composition is applied onto the supporting substrate by a conventionally known method such as comma coating, knife coating, die coating or lip coating, brush coating, dip coating, roll coater, spray coating, curtain roll coating, etc. it can.
- the thickness of the coating film may be adjusted so that the thickness of the B stage film after drying is about 5 to 100 ⁇ m, preferably about 10 to 50 ⁇ m. When drying by heating, 40 to 160 ° C. is preferable, and 50 to 120 ° C. is more preferable, from the viewpoint of suppressing the thermosetting reaction.
- a cover film (surface protection film) may be laminated on the surface of the B stage film formed on the support base material.
- cover film various resin films, metal foils, paper patterns and the like are used as well as the supporting base material.
- thermosetting resin film (B stage film) can be used, for example, as an interlayer adhesive layer in a printed wiring board. Since the resin film has excellent resin embedding property between wirings and also has excellent heat resistance, chemical resistance, flexibility, smoothness, etc., it is a build-up type multilayer printed wiring board, especially a multilayer flexible printed circuit board. It is suitably used as an adhesive layer for wiring boards.
- thermosetting resin film (B stage film) is laminated on the circuit wiring forming surface of the circuit board having the circuit wiring patterned on the substrate, the supporting base material is peeled off, and then an organic insulating layer (if necessary).
- a multilayer printed wiring board can be produced by laminating a substrate film), a conductor, a circuit board, or the like and thermosetting the resin film.
- the thermosetting film obtained by thermosetting the thermosetting resin film functions as an adhesive layer between layers.
- a resin composition is applied onto a circuit board, an organic insulating layer, or a conductor to form a coating film, and if necessary, it is dried to form a thermosetting resin film, which is then thermally cured to form a heat.
- a cured film may be formed.
- thermosetting are not particularly limited, but it is preferable to perform thermosetting at a low temperature in order to prevent oxidation of conductors such as wiring and not to reduce the adhesion between the conductor and the organic insulating layer.
- the heating temperature is preferably 100 to 250 ° C., more preferably 120 to 220 ° C., even more preferably 130 to 190 ° C., and may be 150 to 190 ° C.
- the heating time is not particularly limited, but is generally about 1 minute to 200 minutes. From the viewpoint of improving the embedding property of the resin between the wirings and improving the adhesiveness between the layers, it is preferable to press from above and below the substrate during heating.
- thermosetting film obtained by thermosetting the thermosetting resin composition of the present embodiment has a low dielectric constant and a low dielectric loss tangent, and has a small transmission loss in a high frequency band. Therefore, it can be suitably used for a printed wiring board for an antenna that requires low transmission loss.
- Terminal water ring opening 7.2 g (0.400 mol) of pure water was added to the terminal acid anhydride urethaneimide oligomer solution, heated and refluxed at 110 ° C. for 3 hours to open the terminal acid anhydride group, and the solid content concentration was 60.
- a weight% terminal carboxylic acid urethaneimide oligomer solution was obtained.
- the terminal carboxylic acid urethaneimide oligomer had a weight average molecular weight of 9,200 and an acid value of 86 mgKOH / g.
- ⁇ Synthesis example 2 12.1 g of methyl triglime and 64.0 g (0.400 mol) of norbornene diisocyanate were charged into the reaction vessel as a polymerization solvent, and the mixture was heated to 80 ° C. and dissolved while stirring under a nitrogen stream.
- 19.2 g (0.125 mol) of polycarbonate diol (Asahi Kasei "Duranol T5652") having a number average molecular weight of 2,000 and 2.011 g (0.175 mol) of 2,2-bis (hydroxymethyl) butyrate.
- This solution was stirred at 80 ° C. for 5 hours to obtain an isocyanate-terminated urethane prepolymer containing a carboxy group in the molecule.
- ⁇ Synthesis example 3 Methyltriglime (40.0 g) and norbornene diisocyanate (20.6 g (0.100 mol)) were charged into the reaction vessel as a polymerization solvent, and the mixture was heated to 80 ° C. and dissolved while stirring under a nitrogen stream. To this solution, 50.0 g (0.025 mol) of polycarbonate diol ("Duranol T5652" manufactured by Asahi Kasei Co., Ltd.) having a number average molecular weight of 2,000 and 3.70 g (0.025 mol) of 2,2-bis (hydroxymethyl) butyrate.
- polycarbonate diol (“Duranol T5652" manufactured by Asahi Kasei Co., Ltd.) having a number average molecular weight of 2,000 and 3.70 g (0.025 mol) of 2,2-bis (hydroxymethyl) butyrate.
- thermosetting resin composition ⁇ Preparation of thermosetting resin composition> The components (A) to (E) were added at the ratios shown in Table 1 and mixed uniformly with three rolls to prepare a thermosetting resin composition.
- the ratio shown in Table 1 is the weight ratio of the solid content of each component.
- component (A) a solution of the terminal carboxylic acid urethaneimide oligomer obtained in the above Synthesis Example 1 or Synthesis Example 2 was used.
- component (B) oxazoline group-containing reactive polystyrene (“Epocross RPS-1005” manufactured by Nippon Catalyst Co., Ltd., weight average molecular weight 160,000, oxazoline group amount 0.27 mmol / g) was mixed with ethylene diglycol acetate 6 A solution having a solid content concentration of 16% by weight obtained by stirring for hours was used.
- component (C) the urethane methacrylate solution obtained in Synthesis Example 3 was used.
- a phenoxy epoxy resin (“YL7891” manufactured by Mitsubishi Chemical Corporation) was used.
- particles of an aluminum salt of diethylphosphinic acid (“Exolit OP935” manufactured by Clariant, average particle diameter 2.5 ⁇ m) were used.
- thermosetting resin film ⁇ Preparation of thermosetting resin film>
- the above composition is applied on a copper foil having a thickness of 12 ⁇ m with a bar coater so that the thickness after drying becomes 25 ⁇ m, and heated in an oven at 80 ° C. for 20 minutes to remove the organic solvent, and then placed on the copper foil.
- a laminate having a thermosetting resin film (B stage film) having a thickness of 25 ⁇ m was formed.
- the measurement was performed using a cavity resonator vibration method dielectric constant measuring device (“CP-511” manufactured by Kanto Electronics Applied Development Co., Ltd.) and a network analyzer (“E5071 ENA” manufactured by Keysight Technology Co., Ltd.).
- CP-511 manufactured by Kanto Electronics Applied Development Co., Ltd.
- E5071 ENA manufactured by Keysight Technology Co., Ltd.
- ⁇ Solder heat resistance> A laminate having a thermosetting film on a copper foil was cut into 3 cm ⁇ 3 cm, immersed in a solder bath at 300 ° C. for 10 seconds, and the solder heat resistance was evaluated according to the JPCA-BM02 standard. The sample after immersion in the solder was visually observed to confirm the presence or absence of deformation, melting marks, etc., and evaluated according to the following criteria.
- a polyethylene terephthalate (PET) film having a thickness of 25 ⁇ m was used as a supporting base material, and a laminate having a thermosetting resin film (B stage film) having a thickness of 25 ⁇ m was prepared on the PET film.
- Line / space A thermosetting resin film was laminated on a wiring board provided with copper wiring having a wiring height of 12 ⁇ m concentrically at 50 ⁇ m / 50 ⁇ m, and the PET film was peeled off.
- a heat-press treatment was performed with the polyimide film laminated on the thermosetting resin film, and the resin film was thermoset to prepare a sample for evaluation.
- the press conditions were a pressure of 2 MPa and a pressure application time of 1 hour, and a sample was prepared under two conditions of temperatures of 160 ° C. and 180 ° C.
- the cross sections of the sample pressed at 160 ° C. and the sample pressed at 180 ° C. were observed, and the presence or absence of air bubbles at the interface between the wiring board and the thermosetting film was confirmed and evaluated according to the following criteria.
- Bubbles were found in both samples at 180 ° C.
- Table 1 shows the blending of the thermosetting resin compositions of Examples 1 to 5 and Comparative Examples 1 and 2 and the evaluation results of the resin film.
- the composition of Table 1 also shows the ratio (molar ratio) of the total amount of carboxy groups contained in the components (A) and (C) to the amount of oxazoline groups contained in the component (B).
- Comparative Example 1 in which the component (D) (epoxy resin) was used as the main component and the thermosetting was thermally cured by the reaction between the carboxy group of the component (A) and the epoxy group of the component (D), the relative permittivity and the dielectric loss tangent of the thermosetting film were obtained. The solder heat resistance and embedding property were also insufficient. From the comparison between Example 1 and Comparative Example 1, it can be seen that the component (B), which is polystyrene having an oxazoline group, contributes to lowering the dielectric constant of the cured film and improving heat resistance and embedding property.
- the component (B) which is polystyrene having an oxazoline group
- Comparative Example 2 which does not contain the component (A) and is thermoset by the reaction of the carboxy group of the component (C) and the oxazoline group of the component (B), contains the component (B) and is therefore lower than that of Comparative Example 1.
- the permittivity was increased, the relative permittivity and the dielectric loss tangent were larger than those of Examples 1 to 5, and the solder heat resistance was also insufficient.
- the smaller the ratio of the carboxy group to the oxazoline group that is, the smaller the amount of the residual carboxy group in the cured film
- the relative permittivity and the dielectric loss tangent tend to be. It was.
- the styrene structure portion of the component (B) contributes to the low dielectric constant and the low dielectric loss tangent
- the oxazoline group of the component (B) is the component (A) (and the component (C)). It is considered that the decrease of the residual carboxy group by reacting with the carboxy of the above also contributes to the reduction of the dielectric constant and the low dielectric loss tangent. Further, it is considered that the component (A) having an imide bond contributes to the improvement of heat resistance.
- Example 3 showed a higher relative permittivity of the cured film than Examples 1 and 2, although the ratio of the carboxy group to the oxazoline group in the composition was smaller than that of Examples 1 and 2.
- the dielectric constant is higher than that of Examples 1 and 2 in which only the oxazoline group of the component (B) reacts with the carboxy group. It is considered expensive.
- Example 4 in which the component (C) was used in addition to the component (A) as the carboxy group-containing component, the embedding property was improved as compared with the other examples. Since the apparent glass transition temperature is lowered and the fluidity is improved by containing the component (C), the resin composition is easily filled between the wirings even when heated at a relatively low temperature, so that the resin composition is easily embedded. Is considered to have improved.
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Abstract
Description
本発明の一実施形態は、(A)イミド基およびカルボキシ基を有する化合物、ならびに(B)オキサゾリン基含有化合物を含む熱硬化性樹脂組成物である。熱硬化性樹脂組成物は、さらに(C)成分として、(A)成分以外のカルボキシ基含有化合物を含んでいてもよい。本実施形態の熱硬化性樹脂組成物は、(B)成分のオキサゾリン基が、(A)成分(および(C)成分)のカルボキシ基と反応するため、熱硬化性を示す。
(A)成分は、1分子中に少なくとも1つのイミド基および少なくとも1つのカルボキシ基を有する化合物である。後述の(B)成分との反応性の観点から、(A)成分の酸価は、5~200mgKOH/gが好ましく、10~150mgKOH/gがより好ましく、15~100mgKOH/gがさらに好ましい。
イソシアネート末端ウレタンオリゴマー(ウレタンプレポリマー)は、ジオール化合物とジイソシアネート化合物を、ジイソシアネート化合物が過剰となる比率で反応させることにより得られる。
ジオール化合物とジイソシアネート化合物とを、ジイソシアネート化合物が過剰となる比率で反応させることにより、末端にイソシアネート基を有するウレタンオリゴマーが得られる。ジオール化合物とジイソシアネート化合物との配合比は、水酸基数に対するイソシアネート基数の比(イソシアネート基/水酸基)が1より大きければよい。イソシアネート基/水酸基の比は、1.1~2.0が好ましく、1.15~1.8がより好ましく、1.2~1.6がさらに好ましい。イソシアネート基/水酸基の比が1以下の場合は、末端イソシアネートの比率が低くなる。イソシアネート基/水酸基の比が大きい場合は、1分子のジオールの両末端にジイソシアネートが結合した段階でそれ以上反応が進行しないため、オリゴマーの分子量が大きくならず、熱硬化膜の耐熱性や強度が不足する場合がある。
イソシアネート末端ウレタンオリゴマーとテトラカルボン酸二無水物との脱炭酸イミド化反応により、末端にイミド基および酸無水物基を有するウレタンイミドオリゴマーが得られる。テトラカルボン酸二無水物は、下記一般式(7)で表される。イソシアネート末端ウレタンオリゴマーの両末端にテトラカルボン酸二無水物が反応することにより生成するウレタンイミドオリゴマーは、下記一般式(8)で表される。
末端に酸二無水物基を有するウレタンイミドオリゴマーを、水および/またはアルコールと反応させることにより、酸二無水物基が開環して、一般式(3)で表される末端構造を有するウレタンイミドオリゴマーが得られる。水を用いた場合、一般式(3)におけるR1は水素原子であり、末端はジカルボン酸構造となる。アルコールを用いた場合、一般式(3)におけるR1はアルキル基であり、末端はハーフエステル構造となる。
上記の例では、テトラカルボン酸二無水物を用いて、イソシアネート末端ウレタンオリゴマーの末端をイミド化する例を示したが、両末端酸無水物イミドオリゴマーにより末端変性を行ってもよい。両末端酸無水物イミドオリゴマーは下記の一般式(9)で表される構造を有する。
(B)成分としてのオキサゾリン基含有ポリマーは、下記一般式(1)で表される繰り返し単位を有する。
熱硬化性樹脂組成物は、(C)成分として、上記(A)成分以外のカルボキシ基含有化合物を含んでいてもよい。(C)成分は、(A)成分とともに、(B)成分のオキサゾリン基と反応することにより、熱硬化に寄与する。
(メタ)アクリロイル基やビニル基等のエチレン性不飽和基は、光や熱によるラジカルまたはカチオン反応性を有する。(C)成分は、カルボキシ基が(B)成分のオキサゾリン基と反応することにより、熱硬化に寄与する。そのため、(C)成分がエチレン性不飽和基を含んでいる場合でも、エチレン性不飽和基を硬化反応に寄与させる必要はない。むしろ、(C)成分のエチレン性不飽和基が光や熱による硬化反応に関与すると、柔軟性が失われ、接着性や配線埋め込み性が低下する場合がある。組成物の貯蔵安定性、接着性および配線埋め込み性の観点から、熱硬化性樹脂組成物は、光重合開始剤および熱重合開始剤を実質的に含まないことが好ましい。
上記の通り、熱硬化性樹脂組成物は、(B)成分のオキサゾリン基が、(A)成分(および(C)成分)のカルボキシ基と反応することにより、熱硬化する。熱硬化性樹脂組成物は、(B)成分以外に、カルボキシ基との反応性を有する化合物を含んでいてもよい。
本実施形態の熱硬化性樹脂組成物は、上記(A)~(D)成分以外の固形分を含んでいてもよい。他の成分は、上記(A)~(D)成分以外の樹脂成分であってもよく、熱硬化性を有していてもよく有していなくてもよい。熱硬化膜の低誘電率化および低誘電正接化の観点からは、(A)~(D)以外の樹脂成分の含有量が少ない方が好ましい。(A)~(D)成分以外の樹脂成分の量は、(A)~(D)成分の合計100質量部に対して、100質量部以下が好ましく、50質量部以下がより好ましく、30質量部以下がさらに好ましく、20質量部以下、10質量部以下または5質量部以下であってもよい。
上記の(A)成分および(B)成分、ならびに必要に応じて(C)成分、(D)成分および(E)成分を混合することにより、熱硬化性樹脂組成物を調製できる。熱硬化性樹脂組成物は、(A)~(E)成分を有機溶媒中で混合することが好ましい。有機溶媒としては、樹脂分を溶解可能なものであれば特に限定されない。(A)~(E)成分の調製に用いた有機溶媒を、そのまま熱硬化性樹脂組成物の溶媒として使用してもよい。
熱硬化性樹脂組成物を支持基材(キャリアフィルム)上に塗布し、加熱等により有機溶媒を除去することにより、熱硬化性樹脂膜(Bステージ膜)が得られる。支持基材の厚さは特に制限されないが、一般に、10~150μm程度である。支持基材には、マッド処理、コロナ処理、離型処理等の表面処理が施されていてもよい。
上記の熱硬化性樹脂膜(Bステージ膜)は、例えば、プリント配線板における層間接着層として使用できる。樹脂膜は、配線間への樹脂の埋め込み性に優れており、かつ耐熱性、耐薬品性、柔軟性、平滑性等に優れているため、ビルドアップ方式の多層プリント配線板、特に多層フレキシブルプリント配線板の接着層として好適に用いられる。
<合成例1>
(ウレタンプレポリマーの合成)
反応容器に、重合用溶媒としてメチルトリグライム16.0gおよびノルボルネンジイソシアネート20.7g(0.100モル)を仕込み、窒素気流下で攪拌しながら80℃に加温して溶解させた。この溶液に、ポリカーボネートジオール(旭化成製「デュラノール T5652」)50.0g(0.025モル)および2,2-ビス(ヒドロキシメチル)酪酸8.1g(0.050モル)をメチルトリグライム40.0gに溶解した溶液を、1時間かけて添加した後、80℃で5時間撹拌して、分子内にカルボキシ基を含有するイソシアネート末端ウレタンプレポリマーを得た。
反応容器に、メチルトリグライム40.0gおよび2,2-ビス[4-(3,4-ジカルボキシフェノキシ)フェニル]プロパン二無水物(BPADA)52.0g(0.100モル)を仕込み、80℃に加温して撹拌した。この溶液に、上記のウレタンプレポリマーを1時間かけて添加した。この溶液を180℃で3時間撹拌して、固形分濃度60重量%の末端酸無水物ウレタンイミドオリゴマー溶液を得た。
末端酸無水物ウレタンイミドオリゴマー溶液に、純水7.2g(0.400モル)を投入し、110℃で3時間加熱還流して、末端の酸無水物基を開環し、固形分濃度60重量%の末端カルボン酸ウレタンイミドオリゴマー溶液を得た。末端カルボン酸ウレタンイミドオリゴマーは、重量平均分子量9,200、酸価86mgKOH/gであった。
反応容器に、重合用溶媒としてメチルトリグライム12.1gおよびノルボルネンジイソシアネート64.0g(0.400モル)を仕込み、窒素気流下で攪拌しながら80℃に加温して溶解させた。この溶液に、数平均分子量2,000のポリカーボネートジオール(旭化成製「デュラノール T5652」)19.2g(0.125モル)および2,2-ビス(ヒドロキシメチル)酪酸2.011g(0.175モル)をメチルトリグライム12.1gに溶解した溶液を、1時間かけて添加した。この溶液を80℃で5時間撹拌して、分子内にカルボキシ基を含有するイソシアネート末端ウレタンプレポリマーを得た。
反応容器に、メチルトリグライム13.4gおよびBPADA13.7g(0.340モル)を仕込み、80℃に加温して撹拌した。この溶液に、上記のウレタンプレポリマーを1時間かけて添加した後、180℃で3時間撹拌して、固形分濃度48重量%の末端酸無水物ウレタンイミドオリゴマー溶液を得た。
末端酸無水物ウレタンイミドオリゴマー溶液に、メタノール12.8g(0.400モル)を投入し、110℃で3時間加熱還流して、末端の酸無水物基をハーフエステル化し、固形分濃度48重量%の末端カルボン酸ウレタンイミドオリゴマー溶液を得た。末端カルボン酸ウレタンイミドオリゴマーは、重量平均分子量21,000、酸価43mgKOH/gであった。
反応容器に、重合用溶媒としてメチルトリグライム40.0gおよびノルボルネンジイソシアネート20.6g(0.100モル)を仕込み、窒素気流下で攪拌しながら80℃に加温して溶解させた。この溶液に、数平均分子量2,000のポリカーボネートジオール(旭化成製「デュラノール T5652」)50.0g(0.025モル)、2,2-ビス(ヒドロキシメチル)酪酸3.70g(0.025モル)、および2-ヒドロキシエチルメタクリレート13.02g(0.100モル)をメチルトリグライム40.00gに溶解した溶液を、1時間かけて添加した。この溶液を80℃で5時間加熱攪拌して、分子内にカルボキシ基を含有し、末端にメタクリロイル基を有するウレタンメタクリレートの溶液(固形分濃度52重量%)を得た。ポリマーの重量平均分子量は8,600、酸価は18.0mgKOH/gであった。
JIS K 5601-1-2に従って測定を行った。なお、乾燥条件は170℃×1時間とした。
ゲルパーミエーションクロマトグラフィー(GPC)により、下記条件で測定を行った。
使用装置:東ソー HLC-8220GPC相当品
カラム:東ソー TSK gel Super AWM-H(6.0mm I.D.×15cm)×2本
ガードカラム:東ソー TSK guard column Super AW-H
溶離液:30mM LiBr + 20mM H3PO4 in DMF
流速:0.6mL/min
カラム温度:40℃
検出条件:RI:ポラリティ(+)、レスポンス(0.5sec)
試料濃度:約5mg/mL
分子量標準品:PEG(ポリエチレングリコール)
JIS K 5601-2-1に従って測定を行った。
<熱硬化樹脂組成物の調製>
成分(A)~(E)を、表1に示す比率で投入し、3本ロールにて均一に混合して熱硬化性樹脂組成物を調製した。表1に示す比率は、各成分の固形分の重量比である。
(B)成分としては、オキサゾリン基含有反応性ポリスチレン(日本触媒製「エポクロス RPS-1005」、重量平均分子量160,000、オキサゾリン基量0.27mmol/g)をエチレンジグリコールアセテートと混合して6時間撹拌して得られた固形分濃度16重量%の溶液を用いた。
(C)成分としては、合成例3で得られたウレタンメタクリレートの溶液を用いた。
(D)成分としては、フェノキシエポキシ樹脂(三菱ケミカル製「YL7891」)を用いた。
(E)成分としては、ジエチルホスフィン酸アルミニウム塩の粒子(クラリアント製「Exolit OP935」、平均粒子径2.5μm)を用いた。
厚み12μmの銅箔上に、上記の組成物を乾燥後の厚みが25μmになるようにバーコーターにて塗布し、80℃のオーブンで20分加熱して有機溶媒を除去し、銅箔上に厚み25μmの熱硬化性樹脂膜(Bステージ膜)を備える積層体を形成した。
<比誘電率および誘電正接>
上記の積層体を180℃で1時間加熱して樹脂膜を熱硬化して、銅箔上に熱硬化膜を備える積層体を得た。この積層体の銅箔をエッチングにより除去して、熱硬化膜単層のフィルムを得た。熱硬化膜を、2mm×100mmに切り出し、温度23℃、相対湿度55%の環境下で24時間調湿後に、測定周波数10GHzで比誘電率および誘電正接を測定した。測定には、空洞共振器振動法誘電率測定装置(関東電子応用開発製「CP-511」)およびネットワークアナライザ(キーサイト・テクノロジー製「E5071 ENA」を用いて測定した。
銅箔上に熱硬化膜を備える積層体を、3cm×3cmに切断し、300℃のはんだ浴に10秒間浸漬して、JPCA-BM02規格に準じてはんだ耐熱性を評価した。はんだ浸漬後の試料を目視にて観察し、変形や溶融跡等の変化の有無を確認し、下記の基準により評価した。
A: 全体に変化がみられないもの
B: 全体の面積の50%未満の領域に変化がみられた
C: 全体の面積の50%以上の領域に変化がみられたもの
銅箔に代えて厚み25μmのポリエチレンテレフタレート(PET)フィルムを支持基材として、PETフィルム上に厚み25μmの熱硬化性樹脂膜(Bステージ膜)を備える積層体を作製した。ライン/スペース:50μm/50μmで同心円状に配線高さ12μmの銅配線が設けられた配線板上に、熱硬化性樹脂膜を積層し、PETフィルムを剥離した。熱硬化性樹脂膜上にポリイミドフィルムを積層した状態で加熱プレス処理を行い、樹脂膜を熱硬化して評価用試料を作製した。
A:160℃および180℃の試料のいずれにも気泡がみられないもの
B:180℃の試料には気泡がみられず、160℃の試料には気泡がみられたもの
C:160℃および180℃の試料の両方に気泡がみられたもの
Claims (19)
- 前記(A)成分の酸価が5~200mgKOH/gである、請求項1に記載の熱硬化性樹脂組成物。
- 前記(A)成分の重量平均分子量が1,000~30,000である、請求項1または2に記載の熱硬化性樹脂組成物。
- 前記(A)成分が、末端にカルボキシ基を有するウレタンイミドオリゴマーである、請求項1~3のいずれか1項に記載の熱硬化性樹脂組成物。
- 前記(A)成分は、前記ウレタンイミドオリゴマーのウレタン構造部分にポリカーボネートウレタンを含む、請求項4または5に記載の熱硬化性樹脂組成物。
- 前記(A)成分が、前記ウレタンイミドオリゴマーの側鎖にもカルボキシ基を有する、請求項4~6のいずれか1項に記載の熱硬化性樹脂組成物。
- さらに、(C)成分として、前記(A)成分以外のカルボキシ基含有化合物を含む、請求項1~7のいずれか1項に記載の熱硬化性樹脂組成物。
- 前記(C)成分が、エチレン性不飽和基を含む、請求項8に記載の熱硬化性樹脂組成物。
- 前記(C)成分が、分子鎖の両末端に(メタ)アクリロイル基を有するウレタン(メタ)アクリレートである、請求項8に記載の熱硬化性樹脂組成物。
- 前記(B)成分のオキサゾリン基の量に対する組成物中のカルボキシ基の総量のモル比が0.1~3.0である、請求項1~10のいずれか1項に記載の熱硬化性樹脂組成物。
- さらに、平均粒子径が0.1~10μmの微粒子を含有する、請求項1~11のいずれか1項に記載の熱硬化性樹脂組成物。
- 請求項1~12のいずれか1項に記載の熱硬化性樹脂組成物が層状に形成された熱硬化性樹脂膜。
- 支持基材上に、請求項13に記載の熱硬化性樹脂膜を備える積層体。
- 上記支持基材が、樹脂フィルムまたは銅箔である、請求項14に記載の積層体。
- さらに、前記熱硬化性樹脂膜の表面に仮着されたカバーフィルムを備える、請求項14または15に記載の積層体。
- 請求項13に記載の熱硬化性樹脂膜の熱硬化物からなる熱硬化膜。
- 基板上に設けられた配線と、前記配線を覆う熱硬化膜とを備え、
前記熱硬化膜が請求項17に記載の熱硬化膜である、プリント配線板。 - 基板上に設けられた配線上に、請求項13に記載の熱硬化性樹脂膜を積層し、前記熱硬化性樹脂膜を熱硬化する、プリント配線板の製造方法。
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JP2021195447A (ja) * | 2020-06-12 | 2021-12-27 | 味の素株式会社 | 樹脂組成物 |
WO2023157906A1 (ja) * | 2022-02-18 | 2023-08-24 | リンテック株式会社 | 保護膜形成用フィルム、保護膜形成用複合シート、保護膜付き半導体チップ及び半導体装置 |
JP7515644B1 (ja) | 2023-02-22 | 2024-07-12 | 大日精化工業株式会社 | カルボキシ基含有ポリウレタン樹脂及び樹脂組成物 |
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