WO2006115258A1 - 新規なポリイミドフィルムおよびその利用 - Google Patents
新規なポリイミドフィルムおよびその利用 Download PDFInfo
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- WO2006115258A1 WO2006115258A1 PCT/JP2006/308660 JP2006308660W WO2006115258A1 WO 2006115258 A1 WO2006115258 A1 WO 2006115258A1 JP 2006308660 W JP2006308660 W JP 2006308660W WO 2006115258 A1 WO2006115258 A1 WO 2006115258A1
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- polyimide film
- film
- polyimide
- clad laminate
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Classifications
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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
- H05K1/032—Organic insulating material consisting of one material
- H05K1/0346—Organic insulating material consisting of one material containing N
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
-
- 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
- C08G73/10—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08G73/1067—Wholly aromatic polyimides, i.e. having both tetracarboxylic and diamino moieties aromatically bound
- C08G73/1071—Wholly aromatic polyimides containing oxygen in the form of ether bonds in the main chain
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L79/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen or carbon only, not provided for in groups C08L61/00 - C08L77/00
- C08L79/04—Polycondensates having nitrogen-containing heterocyclic rings in the main chain; Polyhydrazides; Polyamide acids or similar polyimide precursors
- C08L79/08—Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
-
- 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
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
-
- 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
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
- C09J7/25—Plastics; Metallised plastics based on macromolecular compounds obtained otherwise than by reactions involving only carbon-to-carbon unsaturated bonds
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2301/00—Additional features of adhesives in the form of films or foils
- C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
- C09J2301/304—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier the adhesive being heat-activatable, i.e. not tacky at temperatures inferior to 30°C
-
- 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
- C09J2479/00—Presence of polyamine or polyimide
- C09J2479/08—Presence of polyamine or polyimide polyimide
-
- 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
- C09J2479/00—Presence of polyamine or polyimide
- C09J2479/08—Presence of polyamine or polyimide polyimide
- C09J2479/086—Presence of polyamine or polyimide polyimide in the substrate
-
- 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
- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/01—Dielectrics
- H05K2201/0137—Materials
- H05K2201/0154—Polyimide
-
- 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
- H05K3/02—Apparatus or processes for manufacturing printed circuits in which the conductive material is applied to the surface of the insulating support and is thereafter removed from such areas of the surface which are not intended for current conducting or shielding
- H05K3/022—Processes for manufacturing precursors of printed circuits, i.e. copper-clad substrates
-
- 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
- H05K3/38—Improvement of the adhesion between the insulating substrate and the metal
- H05K3/386—Improvement of the adhesion between the insulating substrate and the metal by the use of an organic polymeric bonding layer, e.g. adhesive
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
- Y10T428/2813—Heat or solvent activated or sealable
- Y10T428/2817—Heat sealable
- Y10T428/2826—Synthetic resin or polymer
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31678—Of metal
- Y10T428/31681—Next to polyester, polyamide or polyimide [e.g., alkyd, glue, or nylon, etc.]
Definitions
- the present invention relates to a polyimide film and use thereof, and more particularly to a polyimide film capable of suppressing a dimensional change that occurs in a manufacturing process of a flexible metal-clad laminate and use thereof. Furthermore, the present invention relates to a polyimide film from which a flexible metal-clad laminate having excellent dimensional stability can be obtained when an adhesive layer is provided and a metal foil is bonded by a thermal laminating method, and the use thereof.
- the FPC has a structure in which a circuit made of a metal foil is formed on an insulating film.
- Flexible laminates such as the above FPC are manufactured with flexible metal-clad laminates.
- a flexible metal-clad laminate is generally formed of various insulating materials.
- a flexible insulating film is used as a substrate, and a metal foil is bonded to the surface of the substrate by heating and pressure bonding via various adhesive materials.
- a polyimide film or the like is preferably used as the insulating film! /
- thermosetting adhesive epoxy-based, acrylic-based and other thermosetting adhesives are generally used.
- a flexible wiring board using such a thermosetting adhesive has a three-layer structure of a substrate z, an adhesive material, and a Z metal foil. Therefore, it is also called “three-layer FPC”.
- thermosetting adhesive used in the three-layer FPC has an advantage that it can be bonded at a relatively low temperature.
- FPCs have been proposed in which a metal layer is directly provided on an insulating film, or a thermoplastic polyimide is used for an adhesive layer.
- a metal layer is directly provided on an insulating film, or a thermoplastic polyimide is used for an adhesive layer.
- Such an FPC is directly applied to an insulating substrate. Because it is in the state of forming a metal layer, it is also called double-layer FPC.
- This two-layer FPC has superior characteristics to the three-layer FPC and can fully meet the demands for the various characteristics mentioned above, so demand is expected to grow in the future.
- a method for producing a flexible metal-clad laminate for use in a two-layer FPC for example, (1) Casting that polyimide acid, which is a polyimide precursor, is cast or applied onto a metal foil and then imidized. (2) Metalizing method in which a metal layer is directly formed on a polyimide film by sputtering or plating, and (3) Laminating method in which a polyimide film and a metal foil are bonded via a thermoplastic polyimide.
- the laminating method is excellent in that the thickness of the metal foil that can be handled is wider than that of the casting method and the cost of the apparatus is lower than that of the metalizing method.
- a laminating apparatus a hot roll laminating apparatus that continuously laminates a roll-shaped material or a double belt press apparatus is used. Of these, from the viewpoint of productivity, a hot roll laminating method using a hot roll laminating apparatus can be used more preferably.
- thermosetting resin was used for the adhesive layer, so that the laminating temperature could be less than 200 ° C (patent document) (See 1).
- thermoplastic polyimide is used as the adhesive layer, it is necessary to cover a high temperature of 200 ° C or higher, and in some cases close to 400 ° C, in order to develop heat-fusibility. . For this reason, residual strain is generated in the flexible metal-clad laminate obtained by laminating and appears as a dimensional change when wiring is formed by etching and when solder reflow is performed to mount components.
- thermoplastic polyimide which is a precursor of thermoplastic polyimide
- the cast or applied polyamic acid is continuously heated to imidize it, and when the metal foil is bonded together, the material is continuously heated and pressurized, so the material has no tension. It is often placed in a heated environment in a hung state.
- different thermal stresses are generated in the MD and TD directions. Specifically, a pulling force acts in the MD direction where tension is applied, and conversely, a shrinking force acts in the TD direction.
- a pulling force acts in the MD direction where tension is applied
- a shrinking force acts in the TD direction.
- the metal foil and the heat-resistant adhesive film are formed by pressurizing and heating by placing a protective material between at least a pair of press rolls. And a step of cooling the obtained laminate and the protective material while lightly adhering to each other, and a method of peeling the protective material from the strength of the laminate, The dimensional change rate is reduced.
- Patent Document 3 in the process of manufacturing an FPC, for the purpose of removing moisture in the adhesive film before laminating, the adhesive film is dried in advance and heat laminated in that state, whereby a laminate is obtained. Make sure that there are no uneven patterns on the surface! /
- Patent Document 2 the force of improving the dimensional change by changing the thermal lamination conditions is limited when seeking high dimensional accuracy. There is. Therefore, even when high dimensional accuracy is required, development of applicable dimensional change suppression technology is required.
- the thickness of the insulation layer used in the current two-layer FPC is the mainstream of 25 m (l mil). Due to further reduction of board mounting space, problems such as springback, etc. Thickness The demand for a so-called “no-f mill” with a diameter of 12 to 15 ⁇ m has begun to appear.
- the thickness of the adhesive film is thin in the half-mill product, it is more susceptible to thermal stress during lamination, and it is more difficult to improve the dimensional change than the 1-mil product.
- Patent Document 1 Japanese Published Patent Publication “Japanese Laid-Open Patent Publication No. 9-199830 (Released on July 31, 1997)”
- Patent Document 2 Japanese Patent Publication “JP 2002-326308 Publication (Released on November 12, 2002)”
- Patent Document 3 Japanese Patent Gazette “JP 2002-326280 Publication (Released on November 12, 2002)”
- the present invention has been made in view of the above-mentioned problems, and an object thereof is to provide a polyimide film in which a dimensional change due to thermal stress is suppressed and use thereof.
- polyimide films that can suppress dimensional changes that occur during the manufacturing process of flexible metal-clad laminates, and their use, and in particular, polyimide films that have a function to suppress thermal strain that is applied to materials by the laminating method. To do.
- the present inventors have found that a polyimide film whose storage elastic modulus value is controlled within a specific range is used in the production process of a flexible copper-clad laminate using the polyimide film.
- the inventors have uniquely found that the dimensional change that can occur can be suppressed, and have completed the present invention. That is, the present invention has the following features (1) to (15).
- a polyimide film useful in the present invention is obtained by imidizing a polyamic acid obtained by reacting an aromatic diamine containing 4, 4, 1-diaminodiphenyl ether with an aromatic dianhydride.
- the resulting polyimide film is characterized by satisfying all the following conditions (A) to (D).
- the polyimide film is characterized by being obtained by imidizing a polyamic acid solution obtained through the following steps (a) to (c).
- the polyimide film is characterized in that it is obtained by using 4,4, -diaminodiphenyl ether in an amount of 10 mol% or more of the total diamine component.
- the tensile modulus of the polyimide film is preferably 6. OGPa or more.
- the polyimide film has a hygroscopic expansion coefficient of 13 ppmZ ° C or lower when the polyimide film is held at 50 ° C and 40% RH for 3 hours and then held at 80% RH for 3 hours. .
- the linear expansion coefficient of the polyimide film at 100 ° C to 200 ° C is preferably 15 ppm / ° C or less.
- the adhesive film according to the present invention is characterized in that an adhesive layer containing a thermoplastic polyimide is provided on at least one surface of the polyimide film.
- the adhesive film preferably has a glass transition temperature (Tg) of thermoplastic polyimide of 230 ° C or higher.
- the film thickness of the adhesive film is preferably 15 m or less.
- a flexible metal-clad laminate according to the present invention is obtained by laminating a metal foil on the adhesive film.
- the flexible metal-clad laminate is obtained by sticking a metal foil to the adhesive film using a heat roll laminator having a pair of metal rolls.
- the flexible metal-clad laminate includes a heat having the pair of metal rolls.
- a protective material made of non-thermoplastic polyimide or thermoplastic polyimide whose glass transition temperature (Tg) is 50 ° C or higher than the lamination temperature is made of metal. It is characterized in that it is obtained by laminating it between a foil and a roll, and peeling off the protective material when it is cooled after lamination.
- the laminated body in which the protective material and the flexible metal-clad laminate are in close contact with each other after the lamination is applied to the flexible metal-clad laminate. It is preferable that the protective material is peeled off in the range of 0.1 to 5 seconds and then cooled to cool the laminate.
- the flexible metal-clad laminate has a dimensional change rate power before and after heating at 250 ° C for 30 minutes after removal of the metal foil in both the MD direction and the TD direction. Preferably in the range of%.
- the flexible metal-clad laminate has an adhesive film thickness of 15 m or less, and the dimensional change rate before and after heating at 250 ° C for 30 minutes after removal of the metal foil is in the MD direction. And in the TD direction are preferably in the range of -0. 05 to + 0.05%.
- the polyimide film of the present invention has an inflection point of a storage elastic modulus that relaxes the thermal stress at the time of lamination, and controls its value. Therefore, a flexible metal-clad laminate in which a metal foil is bonded to an adhesive film using the polyimide film as a core by a laminating method has an effect of effectively suppressing the occurrence of dimensional changes. Specifically, the rate of dimensional change before and after heating at 250 ° C for 30 minutes after removing the metal foil should be in the range of -0.04 to + 0.04% in both the MD and TD directions. Is possible. The above effect is particularly prominent when the thickness of the adhesive film is 15 / zm or less. Therefore, it can be suitably used for FPC with fine wiring formed, and problems such as misalignment can be improved.
- the present inventors have intensively studied and the polyimide film having all the four physical properties described below effectively suppresses the dimensional change that occurs when manufacturing a flexible metal-clad laminate. I found.
- the polyimide film of the present invention can simultaneously improve the contradictory physical properties that the adhesiveness and solder heat resistance are reduced when the dimensional change is suppressed. That is, the inventors have also found that the polyimide film of the present invention is suppressed in dimensional change and is excellent in adhesion and solder heat resistance.
- a polyimide film having all these four physicochemical properties has not been known so far, and is a novel polyimide film. The four physical and physical properties are described in detail below.
- the inflection point of the storage elastic modulus of the polyimide film according to the present invention is preferably in the range of 270 to 340 ° C from the viewpoint of relaxation of thermal stress when the metal foil is bonded by the laminating method. Is particularly preferably a force within the range of 280-330 ° C.
- the inflection point of the storage elastic modulus is lower than the above range, the temperature at which the dimensional change after heating of the flexible metal-clad laminate is evaluated (in the field of two-layer FPC, it is evaluated at 250 ° C). In many cases, the core layer begins to soften, which causes deterioration in dimensional change.
- the temperature at which the softening of the core layer starts is high, so that the thermal stress is not sufficiently relaxed at the time of thermal lamination, and the dimensional change is deteriorated.
- tan ⁇ refers to a value obtained by dividing the loss elastic modulus by the storage elastic modulus.
- the peak top force of tan ⁇ is preferably in the range of 320 ° C to 410 ° C, more preferably in the range of 330 ° C to 400 ° C. Good.
- the inventors of the present invention need to make the glass transition temperature of the adhesive layer 230 ° C to 280 ° C, preferably 240 ° C to 280 ° C, in order to achieve both solder heat resistance. I found out. In that case, it has also been found that a laminating temperature of about 380 ° C. is necessary for laminating with good productivity. Therefore, storage elastic modulus control at 380 ° C is very important.
- the polyimide film according to the present invention preferably has a storage elastic modulus power at 380 ° C in the range of 0.4 to 2. OGPa and is in the range of 0.6 to 1.8 GPa. It is particularly preferable that the force is within the range of 0.7 to 1.6 GPa.
- the film cannot maintain its self-supporting property when the film is imidized or thermally laminated, and the productivity of the film is deteriorated. It causes the appearance of the resulting flexible metal-clad laminate to deteriorate.
- the temperature is higher than the above range, the core layer does not sufficiently soften, so that the thermal stress relaxation effect at the time of thermal lamination is not sufficiently exhibited, and the dimensional change is deteriorated.
- the present inventors examined the relationship between the storage elastic modulus a (GPa) at the inflection point and the storage elastic modulus a (GPa) at 380 ° C.
- the thermal stress relaxation effect during thermal lamination is not fully manifested.
- the dimensional change of the flexible metal-clad laminate is a cause of badness.
- the film cannot maintain its self-supporting property, which may deteriorate the productivity of the film or deteriorate the appearance of the resulting flexible metal-clad laminate.
- the polyimide film that is useful in the present invention preferably has the following physical properties.
- the polyimide film useful for the present invention is determined by using the aromatic acid dianhydride and the aromatic diamine, and the mixing ratio, within the range described in the method for producing a polyimide film described below.
- the glass transition temperature and storage modulus of the high temperature region can be expressed.
- the processing method of the adhesive film that is used that is, processing by the thermal laminating method, it is preferable that the tensile elastic modulus is 6. OGPa or more. 6.5 It is more preferable that it is 5 GPa or more. ! /
- the tensile elastic modulus When the tensile elastic modulus is smaller than the above value, it is easily affected by the tension, and residual stress is generated in the flexible metal-clad laminate, which causes a dimensional change. In addition, when the film thickness is reduced, the stiffness of the film is weak, which may cause problems with transportability and handling.
- the upper limit of the tensile modulus is preferably lOGPa or less. 9. OGPa or less is more preferable. If the value is larger than the above value, the stiffness may be too strong, which may cause a problem in handling.
- the hygroscopic expansion coefficient when the polyimide film is held at 50 ° C and 40% RH for 3 hours and then held at 80% RH for 3 hours is 13ppm / ° C or less It is more preferable that it is lppm ppm or less. If the hygroscopic expansion coefficient is larger than the above value, the dimensional change becomes more dependent on the environment, which may cause problems when used as an FPC.
- the linear expansion coefficient of the polyimide film at 100 ° C to 200 ° C is preferably 15 ppmZ ° C or less, preferably 13 ppm / ° C or less. More preferred ,.
- the lower limit of the linear expansion coefficient is preferably 5 ppmZ ° C, more preferably 6 ppmZ ° C. If the linear expansion coefficient of the polyimide film is in the range of 5 to 15 ppmZ ° C, preferably 6 to 13 ppmZ ° C, it becomes easy to bring the linear expansion coefficient of the adhesive film close to that of the metal foil.
- the polyimide film according to the present invention comprises a step of reacting an aromatic diamine and an aromatic acid dianhydride in an organic solvent to obtain a polyamic acid solution (hereinafter referred to as “polyamic acid solution preparation step”). And a process for forming a polyimide film by imidizing the polyamic acid solution (hereinafter also referred to as “imido process”).
- the polyimide film of the present invention can also obtain a solution strength of polyamic acid which is a polyimide precursor.
- the polyamic acid solution is usually an organic solvent so that the aromatic diamine (hereinafter sometimes referred to as “aromatic diamine compound”) and the aromatic dianhydride are in substantially equimolar amounts.
- aromatic diamine compound hereinafter sometimes referred to as “aromatic diamine compound”
- aromatic dianhydride aromatic dianhydride
- These polyamic acid solutions are usually obtained at a concentration of 5 to 35 wt%, preferably 10 to 30 wt%. When the concentration is within this range, the polyamic acid solution obtains an appropriate molecular weight and solution viscosity.
- the polyimide film of the present invention can control various physical properties not only by the structure of aromatic diamine and aromatic dianhydride as raw material monomers but also by controlling the order of monomer addition. It is. Therefore, in order to obtain the polyimide film of the present invention, It is preferable to imidize the polyamic acid solution obtained through the steps (a) to (c).
- the aromatic diamine that can be used as a raw material monomer for the polyimide film of the present invention includes 4,4'-diaminodiphenylpropane, 4,4'-diaminodiphenylmethane, benzidine, 3,3'-dichloromethane.
- Benzidine 3,3'-dimethylbenzidine, 2,2'-dimethylbenzidine, 3,3'-dimethoxybenzidine, 2,2'-dimethoxybenzidine, 4,4'-diaminodiphenylsulfide, 3,3, -diaminodiphenylsulfone, 4, 4'-diaminodiphenyl sulfone, 4, 4'-diaminodiphenyl ether, 3, 3, -diaminodiphenyl ether, 3, 4'-diaminodiphenyl ether, 1,5 diaminonaphthalene, 4, 4 '-Diaminodiphenyl dirugetylsilane, 4,4'-diaminodiphenylsilane, 4,4'-diaminodiphenylphosphine oxide, 4,4'-diamy Diphenyl N-methylamine, 4, 4'-diaminodiphenyl N-phenylamine, 1,4
- step (a) it is preferable to obtain a prepolymer that forms a block component derived from thermoplastic polyimide.
- a prepolymer that forms a block component derived from a thermoplastic polyimide it is preferable to react a flexible diamine with an acid dianhydride.
- the "block component derived from thermoplastic polyimide” refers to a polyimide film obtained by reacting an aromatic tetracarboxylic dianhydride constituting the block component and an aromatic diamine compound in an equimolar amount.
- Grease film (For convenience, use a polyimide film with thermoplastic polyimide block force) 1S Fix to a metal fixed frame and soften when heated at 400 ° C for 1 minute to retain the original film shape It refers to something that does not.
- a polyimide film having a thermoplastic polyimide block component strength can be obtained by a known method with a maximum baking temperature of 300 ° C and a baking time of 15 minutes.
- the polyimide obtained by equimolar reaction of the aromatic diamine compound and the aromatic acid anhydride component used in the step (a) melts at the above temperature or does not maintain the shape of the film.
- the aromatic diamine compound and the aromatic dianhydride component can be selected.
- the polyamic acid in which the thermoplastic sites are interspersed in the molecular chain can be obtained by proceeding the reactions in the above-mentioned steps (b) and (c).
- the aromatic diamine compound and the aromatic dianhydride component used in the steps (b) and (c) are selected, and the polyamic acid is selected so that the final polyimide is non-thermoplastic. If the polymer is polymerized, the polyimide film obtained by imidizing it will have an inflection point of the storage elastic modulus in a high temperature region due to having a thermoplastic part.
- thermoplastic part since most of the molecular chain has a non-thermoplastic structure, controlling the ratio of the thermoplastic part to the non-thermoplastic part drastically reduces the storage elastic modulus in the high temperature region, and the film If it becomes difficult to form a film or the appearance deteriorates due to heating during processing into an adhesive film, it is possible to prevent problems.
- the “flexible diamine” is a diamine having a flexible structure such as an ether group, a sulfone group, a ketone group, and a sulfide group, preferably the following general formula (1)
- [0072] is a group selected from the group consisting of divalent organic groups represented by:
- the aromatic diamine component used in the step (b) is preferably a diamine having a rigid structure, so that the film finally obtained can be made non-thermoplastic.
- diamine having a rigid structure means that there is no flexibility in the main chain between two NH groups.
- the specific configuration is not particularly limited as long as it has a rigid structure.
- An example of diamine having a strong rigid structure is the following general formula (2) [0074] [Chemical 3]
- [0077] is a divalent aromatic group represented by the group force selected, and R in the formula is the same or
- 3 is different from H—, CH 1, mono OH, —CF, mono SO, mono COOH, CO — NH, C1, mono,
- the ratio of use of the diamine having a rigid structure and the diamine having a flexible structure is 80:20 to 20:80 in monore ratio, and further 70:30 ⁇ 30: 70, especially 60: 40-40: 60 is preferred! / ,.
- a plurality of diamines having the above-mentioned flexible structure and rigid structure may be used in combination.
- 4,4'-diaminodiphenyl is used as the flexible structure diamine.
- Particular preference is given to using ethers.
- the 4,4, -diaminodiphenyl ether Since the 4,4, -diaminodiphenyl ether has only one ether bond at the bending site, it exhibits an intermediate property between a diamine having a flexible structure and a diamine having a rigid structure. That is, it has the effect of lowering the storage elastic modulus, but does not increase the linear expansion coefficient so much. Therefore, the physical property balance of the resulting polyimide film can be obtained by using in combination with diamine having many bending sites such as 1,3-bis (3-aminophenoxy) benzene and bis ⁇ 4- (4-aminophenoxy) phenyl ⁇ propane. Easy to take. Furthermore, by using 4,4'-diaminodiphenyl ether as a raw material for polyimide film, the productivity of the film can be further improved while maintaining the above-mentioned excellent film characteristics. it can.
- the amount of 4,4'-diaminodiphenyl ether used is preferably 10 mol% or more of the total diamine component, more preferably 15 mol% or more. If it is less than this, the above effects may not be sufficiently exhibited. On the other hand, the upper limit, preferably 50 mol% or less tool 4 0 mole 0/0 or less is more preferable. If it is more than this, the resulting polyimide film may have a low tensile elastic modulus.
- acid dianhydrides are also classified into acid dianhydrides having a flexible structure and acid dianhydrides having a rigid structure, and the former in step (a) and the latter in ( c) It is preferably used in each step.
- aromatic dianhydride used in the step (a) examples include benzophenone tetracarboxylic dianhydrides, oxyphthalic dianhydrides, biphenyl tetracarboxylic dianhydrides 1S Preferred examples As mentioned.
- aromatic acid dianhydride used in step (c) above As a preferred example, pyromellitic dianhydride power is given.
- the amount of benzophenone tetracarboxylic dianhydrides, oxyphthalic dianhydrides, and biphenyl tetracarboxylic dianhydrides used is preferably total acid dianhydride, that is, Chi, the (a) ⁇ (c) 10 ⁇ 50 mol% with respect to step Nio, total acid dianhydrides used Te, more preferably ⁇ or 15-45 Monore 0/0, particularly preferably ⁇ or 20-40 Monore 0/0.
- the glass transition temperature of the resulting polyimide film may be too high or the storage elastic modulus in the high temperature region may not be sufficiently lowered with only the diamine having a flexible structure. is there.
- the glass transition temperature may be too low, or the storage elastic modulus in the high temperature region may be too low, making film formation difficult.
- the preferred amount used is the total acid dianhydride, that is, the total acid dianhydride used in the steps (a) to (c). 40-: LOOmol%, more preferably 50-90 mol%, particularly preferably 60-80 mol%.
- the solvent for synthesizing the polyamic acid solution is not particularly limited, and any solvent can be used as long as it dissolves polyamic acid. preferable. Specific examples include N, N-dimethylformamide (hereinafter also referred to as “DMF”), N, N-dimethylacetamide, N-methyl-2-pyrrolidone, and the like. N, N-dimethylformamide, and N , N-dimethylacetamide can be particularly preferably used.
- the polyimide film useful for the present invention has physical properties such as tensile elastic modulus, hygroscopic expansion coefficient, and linear expansion coefficient, as described in detail in the above section I.
- the tensile modulus increases as the ratio of rigid structure diamine or dianhydride increases, and decreases as the ratio decreases.
- the hygroscopic expansion coefficient tends to increase as the proportion of polar groups such as ether groups and carbonyl groups in the polyimide molecular chain increases.
- the use of diamine components and acid dianhydride components having a low molecular weight tends to increase. Therefore, it can be controlled by adjusting the usage ratio of the flexible structure component and selecting the monomer structure (molecular weight).
- the linear expansion coefficient of the polyimide film can be adjusted by the mixing ratio of the flexible structural component and the rigid structural component as described above.
- a filler is added for the purpose of improving various film properties such as slidability, thermal conductivity, conductivity, corona resistance, and loop stiffness. You can also.
- the filler to be added is not particularly limited, but preferred examples include silica, titanium oxide, alumina, silicon nitride, boron nitride, calcium hydrogen phosphate, calcium phosphate, mica and the like.
- the particle size of the filler is not particularly limited, and may be determined depending on the film properties to be modified and the type of filler to be added. In general, the average particle size is 0.05 to 100 m, preferably 0.1 to 75 ⁇ m, more preferably 0.1 to 50 ⁇ m, and particularly preferably 0.1 to 25 ⁇ .
- the number of fillers to be added is not particularly limited, and the film characteristics to be modified may be determined based on the filler particle size or the like.
- the amount of filler added to the filler is from 0.01 to 100 parts by weight of positive imide: LOO parts by weight, preferably 0.01 to 90 parts by weight, more preferably 0.02 to 80 parts by weight. is there.
- the method for adding the filler is not particularly limited, and any known method may be used. For example, the following method can be mentioned.
- the method (3) is preferable because contamination by the filler in the production line is minimized.
- the same solvent as the polyamic acid polymerization solvent as the solvent used in the dispersion.
- a conventionally known method can be used as a method for producing a polyimide film by imidizing the polyamic acid solution prepared as described above.
- a conventionally known method can be used.
- Specific examples include a thermal imidization method and a chemical imidization method.
- the thermal imidization method is a method in which an imidization reaction proceeds by heating alone without using a dehydrating ring-closing agent or the like.
- the chemical imidization method is a method of promoting imidization by allowing a chemical conversion agent and Z or an imidization catalyst to act on a polyamic acid solution.
- chemical conversion agent means a dehydrating ring-closing agent for polyamic acid.
- aliphatic acid anhydride aromatic acid anhydride, N, N'-dialkylcarbodiimide, halogenated low Secondary aliphatic, halogenated lower fatty acid anhydrides, aryl phosphonic dihalides, and thionyl halides, or mixtures of two or more thereof.
- aliphatic acid anhydrides such as acetic anhydride, propionic anhydride, and latacic anhydride, or a mixture of two or more thereof can be preferably used from the viewpoint of availability and cost.
- imido catalyst means a component having an effect of promoting dehydration ring-closing action on polyamic acid, and examples thereof include aliphatic tertiary amines, aromatic tertiary amines, and heterocyclic rings.
- the formula tertiary amine is used.
- those selected from heterocyclic tertiary amine forces are particularly preferably used from the viewpoint of reactivity as a catalyst.
- quinoline, isoquinoline, ⁇ -picoline, pyridine and the like are preferably used.
- the film may be produced using either the thermal imidization method or the chemical imidization method, but the chemical imidization method has various characteristics that are preferably used in the present invention.
- Polyimide film Easier to get Irum.
- the imidization step when the chemical imidization method is used, the imidization step includes casting the film-forming dope containing the polyamic acid solution on the support, and heating the support on the support.
- the step of peeling off the gel film hereinafter also referred to as “gel film preparation step” and the step of further heating the gel film to imidize and dry the remaining amic acid (hereinafter referred to as “the gel film preparation step”) It is preferable to include “the baking process”.
- a chemical conversion agent and / or an imidization catalyst are mixed in a polyamic acid solution at a low temperature to obtain a film-forming dope.
- the chemical conversion agent and imidation catalyst are not particularly limited, but the compounds exemplified above can be selected and used.
- a film forming dope may be obtained by mixing in a polyamic acid solution using a curing agent containing a chemical conversion agent and an imidization catalyst.
- the amount of the chemical conversion agent added is preferably in the range of 0.5 to 5 mol per mol of the amic acid unit in the polyamic acid. 1.0 to 4 mol The ability to be within is even better.
- the amount of the imidation catalyst added is preferably in the range of 0.05 to 3 mol per mol of the amic acid unit in the polyamic acid, and in the range of 0.2 to 2 mol. Is particularly preferred.
- the film-forming dope is then cast into a film on a support such as a glass plate, aluminum foil, endless stainless steel belt, or stainless steel drum. Thereafter, the film forming dope is heated on the support in a temperature range of 80 ° C. to 200 ° C., preferably 100 ° C. to 1 80 ° C. This activates the chemical conversion agent and the imidization catalyst, resulting in partial curing and Z or drying. Then peel off from the support To obtain a polyamic acid film (hereinafter also referred to as “gel film”).
- the gel film is in an intermediate stage of curing to polyamic acid polyimide and has a self-supporting property.
- the volatile content of the gel film is preferably in the range of 5 to 500% by weight, more preferably in the range of 5 to 200% by weight, and in the range of 5 to 150% by weight. It is particularly preferred. By using a gel film having a volatile content within this range, it is possible to avoid problems such as film color unevenness due to film breakage, drying unevenness, and characteristic variations that occur in the baking process.
- A represents the weight of the gel film
- B represents the weight after heating the gel film at 450 ° C. for 20 minutes.
- the ends of the gel film are fixed to avoid shrinkage during curing, and the water, residual solvent, residual conversion agent and imidation catalyst are removed, and the remaining amic acid Is completely imidized to obtain the polyimide film of the present invention.
- heat treatment can be performed under the minimum tension necessary for transporting the polyimide film.
- This heat treatment may be performed in the above baking step, or may be provided separately. Since the heating conditions vary depending on the characteristics of the polyimide film and the apparatus used, it cannot be determined unconditionally. However, in general, the heating temperature is 200 ° C or higher and 500 ° C or lower, preferably 250 ° C or higher and 500 ° C or lower, particularly preferably 300 ° C or higher and 450 ° C or lower. is there.
- the heating time is generally 1 to 300 seconds, preferably 2 to 250 seconds, and particularly preferably 5 to 200 seconds. Of the above heating conditions Internal stress can be relaxed by heat treatment.
- the tension in the TD direction is substantially no tension
- the tension in the TD direction is substantially no tension
- the present inventors produced an adhesive film having the polyimide film as a core layer by providing an adhesive layer on at least one side of the polyimide film according to the present invention.
- the use of this adhesive film can alleviate thermal distortion during thermal lamination and effectively suppress the occurrence of dimensional changes. That is, the adhesive film according to the present invention can be obtained by providing an adhesive layer containing thermoplastic polyimide on at least one surface of the polyimide film.
- thermoplastic polyimide contained in the adhesive layer
- thermoplastic polyimide, thermoplastic polyamideimide, thermoplastic polyetherimide, thermoplastic polyesterimide, and the like can be suitably used.
- the thermoplastic polyimide in the present invention has a range of 150 to 300 ° C. It preferably has a glass transition temperature (Tg). Further, taking into account the hygroscopic solder resistance, Tg is preferably 230 ° C or higher, more preferably 240 ° C or higher. Tg can be obtained from the value of the inflection point of the storage elastic modulus measured by a dynamic viscoelasticity measuring device (DMA).
- DMA dynamic viscoelasticity measuring device
- Polyamic acid which is a precursor of thermoplastic polyimide is not particularly limited, and any known polyamic acid can be used. Also for the production, known raw materials, reaction conditions and the like can be used (for example, see Examples described later). If necessary, inorganic fillers or organic fillers may be added.
- Examples of the method for producing an adhesive film that can be applied to the present invention include (1) a method of forming an adhesive layer on a polyimide film to be a base film, or (2) molding the adhesive layer into a sheet, The method etc. which are bonded together to the said base film can be used suitably.
- the method (1) when the method (1) is adopted, if the polyamic acid that is the precursor of the thermoplastic polyimide contained in the adhesive layer is completely imidized, the solubility in an organic solvent is reduced. Since it may decrease, it may be difficult to provide the adhesive layer on the base film (the polyimide film). Therefore, from the above viewpoint, it is more preferable to prepare a solution containing a polyamic acid which is a precursor of a thermoplastic polyimide, apply the solution to a base film, and then imidize it. As the imidization method at this time, either a thermal imidization method or a chemical imidization method can be used.
- the temperature at that time is (glass transition temperature 100 ° C of thermoplastic polyimide) to (glass transition temperature + 200 ° C) is preferable, and (glass transition temperature of thermoplastic polyimide—50 ° C) to (glass transition temperature + 150 ° C) is more preferable.
- the temperature of the thermal imidis is high in terms of productivity because it can easily increase the imidization rate because a high force S imidy tends to occur. However, if the temperature is too high, the thermoplastic polyimide may undergo thermal decomposition. On the other hand, if the temperature of the thermal imidizer is too low, the time required for the imidization step in which the imidization is difficult to proceed even in the chemical imidization method becomes long.
- the imidization time is not limited to a specific one, but it is sufficient to take a sufficient time for the imidization and drying to be substantially completed. Generally, it is set appropriately in the range of about 1 to 600 seconds. In addition, for the purpose of improving the melt fluidity of the adhesive layer, it is possible to “intentionally lower the rate of imidization” and Z or “to leave the solvent”.
- the tension applied when imidizing is lkgZn! It is preferable to be within the range of ⁇ 15kgZm 5kgZn! It is particularly preferable to be within the range of ⁇ lOkgZm.
- Tension is in the above range If it is too small, sagging may occur during film transport, and problems such as inability to wind evenly may occur. On the other hand, if it is larger than the above range, a core film with a high tensile elastic modulus or a core film with MD orientation was used because the adhesive film was heated to a high temperature with strong tension. However, thermal stress is generated in the adhesive film, which may affect the dimensional change.
- the method of casting and applying the polyamic acid solution for forming the adhesive layer to the base film is not particularly limited, and an existing method such as a die coater, a reverse coater, or a blade coater may be used. it can.
- the polyamic acid solution may contain other materials such as fillers, depending on the application.
- each layer of the adhesive film may be appropriately adjusted so as to have a total thickness according to the application.
- the difference between the thermal expansion coefficient of the adhesive film and the thermal expansion coefficient of the metal foil is preferably within ⁇ 10 ppm, more preferably within ⁇ 5 ppm.
- the surface of the core film may be subjected to various surface treatments such as corona treatment, plasma treatment, and coupling treatment before or after providing the adhesive layer.
- the flexible metal-clad laminate according to the present invention is obtained by a production method, which will be described in detail later, and is obtained by bonding a metal foil to the adhesive film.
- the metal foil to be used is not particularly limited, but when the flexible metal-clad laminate of the present invention is used for electronic equipment / electric equipment, for example, copper or copper alloy, stainless steel or alloy thereof, Examples include nickel or nickel alloy (including 42 alloy), aluminum or aluminum alloy foil.
- rolled copper foil In a general flexible metal-clad laminate, rolled copper foil, electrolytic copper foil, and force used frequently are used in the present invention.
- the surface of these metal foils may be coated with a heat-resistant layer or a heat-resistant layer or an adhesive layer.
- the thickness of the metal foil is not particularly limited as long as it has a sufficient function depending on its use.
- the total value of the dimensional change rate before and after heating at 250 ° C for 30 minutes after removing the metal foil is -0 in both the MD direction and the TD direction. It is highly preferred that it is in the range of 04 to +0.04.
- the rate of dimensional change before and after heating is expressed as a ratio between a difference between a predetermined dimension in the flexible metal-clad laminate after the etching process and a predetermined dimension after the heating process and a predetermined dimension before the heating process.
- the method for measuring the rate of dimensional change is not particularly limited, and any known method can be used as long as it can measure the increase or decrease in dimensions that occurs before or after the etching or heating process in a flexible metal-clad laminate. Such a method can also be used.
- the dimensional change rate is preferably measured in both the MD direction and the TD direction.
- the tension is different in the MD and TD directions, so there is a difference in the degree of thermal expansion and contraction, and the dimensional change rate is also different.
- the total value of the dimensional change rate before and after heating of the flexible metal-clad laminate at 250 ° C. for 30 minutes after removing the metal foil in both the MD direction and the TD direction is ⁇ 0.04 to + It is highly preferred that it be in the range of 0.0.04.
- the core layer polyimide film used in the adhesive film of the present invention has a characteristic of effectively relaxing thermal stress. Therefore, even when the thickness of the adhesive film according to the present invention is 15 m or less which is more easily affected by thermal stress, the dimensional change rate of the obtained flexible metal-clad laminate can be reduced.
- the total dimensional change rate before and after heating at 250 ° C. for 30 minutes after removal of the metal foil is preferably in the range of 0.05 to +0.05 in both the MD and TD directions.
- the method for producing a flexible metal-clad laminate that is useful in the present invention is as follows, but is not limited thereto.
- the method for producing a flexible metal-clad laminate according to the present invention preferably includes a step of bonding a metal foil to the adhesive film.
- a hot roll laminating apparatus having a pair of metal rolls or a continuous treatment by a double belt press can be used.
- DBP double belt press
- the polyimide film and the adhesive film of the present invention are particularly susceptible to dimensional changes. Shows a remarkable effect when bonded with a hot roll laminator.
- the “heat roll laminating apparatus having a pair of metal rolls” is a specific apparatus structure as long as the apparatus has a metal roll for heating and pressurizing a material.
- the composition is not particularly limited.
- thermal lamination process The process of bonding the adhesive film and the metal foil by thermal lamination is hereinafter referred to as "thermal lamination process”.
- thermo lamination means The specific configuration of the means for carrying out the above thermal lamination (hereinafter, also referred to as "thermal lamination means”) is not particularly limited, but the appearance of the resulting laminate is good. Therefore, it is preferable to arrange a protective material between the pressing surface and the metal foil.
- Examples of the protective material include materials that can withstand the heating temperature of the thermal laminating process, such as heat-resistant plastics such as non-thermoplastic polyimide films, copper foils, aluminum foils, and SUS foils. Metal foils, etc. are mentioned.
- heat-resistant plastics such as non-thermoplastic polyimide films, copper foils, aluminum foils, and SUS foils.
- Metal foils, etc. are mentioned.
- Tg glass transition temperature
- the thickness of the non-thermoplastic polyimide film is preferably 75 ⁇ m or more, because the protective material is too thin and does not sufficiently serve as a buffer and protection during lamination. Yes.
- the protective material may have a multilayer structure of two or more layers having different characteristics, which is not necessarily a single layer.
- the laminate temperature is high, if the protective material is used for the laminate as it is, the appearance and dimensional stability of the resulting flexible metal-clad laminate may not be sufficient due to rapid thermal expansion. Therefore, it is preferable to preheat the protective material before lamination. As described above, when the protective material is preheated and then laminated, since the thermal expansion of the protective material has been completed, the appearance and dimensional characteristics of the flexible metal-clad laminate are suppressed.
- Examples of the preheating means include a method of bringing a protective material into contact with a heating roll.
- the contact time is preferably 1 second or longer, and more preferably 3 seconds or longer.
- lamination is performed without completing the thermal expansion of the protective material. Therefore, the thermal expansion of the protective material occurs during lamination, and the appearance and dimensional characteristics of the resulting flexible metal-clad laminate are obtained. May be evil.
- the distance at which the protective material is held on the heating roll is not particularly limited, and may be appropriately adjusted based on the diameter of the heating roll and the contact time.
- the heating method of the material to be laminated in the heat laminating means is not particularly limited.
- a conventionally known method that can be heated at a predetermined temperature such as a heat circulation method, a hot air heating method, an induction heating method, or the like.
- the employed heating means can be used.
- the method of pressurizing the material to be laminated in the thermal lamination means is not particularly limited.
- a predetermined pressure such as a hydraulic method, a pneumatic method, or a gap pressure method can be applied.
- a pressurizing means employing a conventionally known method can be used.
- the heating temperature in the thermal laminating step is preferably the glass transition temperature (Tg) of the adhesive film + 50 ° C or higher, and more preferably Tg + 100 ° C or higher of the adhesive film. preferable. If the temperature is Tg + 50 ° C or higher, the adhesive film and the metal foil can be heat-laminated well. Further, if Tg + 100 ° C or more, the laminating speed can be increased to further improve the productivity.
- Tg glass transition temperature
- the polyimide film used as the core of the adhesive film of the present invention is designed so that thermal stress relaxation effectively acts when laminated at Tg + 100 ° C or higher. Therefore, a flexible metal-clad laminate excellent in dimensional stability can be obtained with high productivity.
- thermoplastic polyimide is contained in the adhesive layer of the adhesive film, the laminating temperature is inevitably high, so the flexible metal-clad laminate immediately after laminating is also very hot.
- the storage elastic modulus power of the core layer of the adhesive film is reduced to a certain value or more, the entire adhesive film softens together with the adhesive layer (however, the self-supporting property is maintained).
- the thermal stress accumulated in the laminate is alleviated by the tension and pressure during thermal lamination.
- the flexible metal-clad laminate immediately after lamination is treated as follows. First, the flexible metal-clad laminate immediately after lamination is brought into contact with a heating roll while the protective material is still disposed. In this way, it is preferable to reduce the residual strain generated during thermal lamination in a state where it is not affected by the tension, and then release the heating roll force.
- the contact time with the heating roll is preferably 0.1 seconds or more, more preferably 0.2 seconds or more, and particularly preferably 0.5 seconds or more. If the contact time is shorter than the above range, the relaxation effect may not occur sufficiently.
- the upper limit of the contact time is preferably 5 seconds or less. Even if the contact is made for longer than 5 seconds, the relaxation effect is not increased. This is not preferable because the laminating speed is lowered and the line handling is restricted. [0163] Further, even when the film is brought into contact with a heating roll and subjected to slow cooling after lamination, the difference between the flexible metal-clad laminate and room temperature is still large, and the residual strain may not be alleviated.
- the post-heating process on the flexible metal-clad laminate plate after being brought into contact with a heating roll and gradually cooled, with the protective material still disposed.
- the tension at this time is preferably in the range of 1 to: LONZcm.
- the post-heating atmosphere temperature is preferably in the range of (laminate temperature-200 ° C) to (laminate temperature + 100 ° C).
- the "atmospheric temperature” here refers to the outer surface temperature of the protective material in close contact with both surfaces of the flexible metal-clad laminate. Although the actual temperature of the flexible metal-clad laminate varies somewhat depending on the thickness of the protective material, if the temperature of the surface of the protective material is within the above range, the effect of post-heating can be exhibited.
- the outer surface temperature of the protective material can be measured using a thermocouple or a thermometer.
- the laminating speed in the thermal laminating step is preferably 0.5 mZ min or more. 1. More preferably, it is OmZ min or more. If it is 0.5 mZ or more, sufficient thermal lamination is possible. Further, if it is 1. OmZ or more, productivity can be further improved.
- the laminating pressure is preferably in the range of 49 to 490 NZcm (5 to 50 kgfZcm), more preferably in the range of 98 to 294 N / cm (10 to 30 kgf / cm). Within this range, the three conditions of laminating temperature, laminating speed, and laminating pressure can be improved, and productivity can be further improved.
- the adhesive film tension in the laminating step is preferably in the range of 0.01 to 4 NZcm, and more preferably in the range of 0.02 to 2.5 N / cm. ⁇ 1 is particularly preferably within the range of 5 NZcm. If the tension falls below the above range, slack and meandering will occur during the conveyance of the laminate, and it will not be uniformly fed into the heating roll. It may be difficult to obtain a flexible metal-clad laminate with a good view. On the other hand, if the above range is exceeded, the influence of tension becomes so strong that it cannot be relaxed by controlling the Tg and storage modulus of the adhesive layer, resulting in poor dimensional stability.
- a thermal laminating apparatus that continuously press-bonds the material to be laminated while heating.
- a laminated material feeding means for feeding the laminated material may be provided in the preceding stage of the thermal laminating means, or a laminated material for winding the laminated material in the subsequent stage of the thermal laminating means.
- a scooping means may be provided.
- the specific configurations of the laminated material feeding means and the laminated material catching means are not particularly limited.
- an adhesive film, a metal foil, or an obtained laminated plate can be scraped off.
- a well-known roll-shaped scraper etc. can be mentioned.
- protective material catching means and protective material feeding means for winding and feeding the protective material. If these protective material take-up means and protective material feeding means are provided, the protective material can be reused by winding the protective material once used in the thermal laminating process and installing it again on the feeding side. .
- an end position detecting means and a scraping position correcting means may be provided in order to align both ends of the protective material.
- the end portions of the protective material can be aligned and wound with high accuracy, so that the efficiency of reuse can be increased.
- the specific configurations of the protective material catching means, the protective material feeding means, the end position detecting means, and the catch position correcting means are not particularly limited, and various conventionally known devices can be used. .
- the flexible metal-clad laminate obtained by the manufacturing method according to the present invention can form various miniaturized and high-density parts by etching a metal foil to form a desired pattern wiring. It can be used as a mounted flexible wiring board. Needless to say, the use of the present invention is not limited to this, and it is needless to say that a laminate including a metal foil can be used for various purposes. It should be noted that the present invention is not limited to the configurations described above, and various modifications are possible within the scope shown in the claims, and technical means disclosed in different embodiments respectively. Embodiments obtained by appropriately combining the above are also included in the technical scope of the present invention.
- the present invention will be specifically described by way of examples. However, the present invention is not limited to these examples. Those skilled in the art can make various changes, modifications, and alterations without departing from the scope of the present invention.
- the glass transition temperature of the thermoplastic polyimide, the storage elastic modulus of the polyimide film, the tensile elastic modulus, the hygroscopic expansion coefficient and the linear expansion coefficient, the dimensional change rate of the flexible metal-clad laminate, the metal in the synthesis examples, examples and comparative examples The evaluation methods of foil peel strength and moisture absorption solder resistance are as follows.
- the glass transition temperature was measured with a DMS6100 manufactured by SII Nanotechnology, and the inflection point of the storage modulus was taken as the glass transition temperature.
- Sample measurement range width 9mm, distance between grips 20mm
- the storage elastic modulus was measured with the apparatus and conditions for measuring the glass transition temperature. The measurement was performed in the MD direction of the core film.
- the tensile modulus was measured according to ASTM D882. The measurement was performed in the MD direction of the core film. Sample measurement range: width 15mm, distance between grips 100mm
- the hygroscopic expansion coefficient was also calculated by the amount of change when measured using a water vapor atmosphere thermomechanical analyzer TMAZHU M-1 manufactured by Rigaku Corporation. The measurement was performed at an angle of 45 ° with respect to the molecular orientation axis of the core film.
- Sample measurement range width 5mm, distance between grips 15mm
- the linear expansion coefficient of the polyimide film is as follows: Thermomechanical analyzer manufactured by SII NanoTechnology Co., Ltd. Product name: TMA / SS6100 is used to raise the temperature from 0 ° C to 460 ° C and then to 10 ° C. Furthermore, the temperature was raised at 10 ° C / min, and the average value in the range of 100 to 200 ° C at the second temperature rise was obtained. Measurements were made in the MD and TD directions of the core film. Sample shape; width 3 mm, length 10 mm
- Measurement temperature range 0 to 460 ° C
- the dimensional change rate was measured in both the MD direction and the TD direction.
- Samples were prepared according to JIS C6471 “6.5 peel strength”, 5 mm wide metal foil was peeled off at 180 ° peeling angle and 50 mmZ, and the load was measured.
- the solder resistance of the sample prepared under two conditions normal (20 ° C, 60% RH, after 24 hours adjustment) and moisture absorption (85 ° C, 85% RH, after 96 hours adjustment) And the presence or absence of abnormalities of the whitening phenomenon and the peeling phenomenon on the appearance were determined.
- the normal solder was immersed in a solder bath at 300 ° C for 1 minute and the hygroscopic solder was immersed in a solder bath at 260 ° C for 10 seconds.
- a solution prepared by dissolving Og TMEG in 20 g DMF was separately prepared, and this was gradually added to the above reaction solution while paying attention to the viscosity and stirred. When the viscosity reached 3000 poise (300 Pa's), the addition and stirring were stopped to obtain a polyamic acid solution.
- the obtained polyamic acid solution was cast on a 25 ⁇ m PET film (Therapy HP, manufactured by Toyo Metallizing Co., Ltd.) to a final thickness of 20 m, and dried at 120 ° C for 5 minutes.
- the dried self-supporting film is peeled off from the PET and fixed on a metal pin frame.
- 150 ° C for 5 minutes 200 ° C for 5 minutes, 250 ° C for 5 minutes, 350 ° C for 5 minutes Drying was performed for a minute.
- the glass transition temperature of the obtained single layer sheet was measured and found to be 240 ° C.
- PMDA pyromellitic dianhydride
- p-PDA p-phenol-diamine
- Acetic anhydride Z isoquinoline ZDMF weight ratio 2.0 / 0. 3/4.
- Imidic wrinkle accelerator which also has strength, is added at a weight ratio of 45% with respect to the polyamic acid solution, continuously stirred with a mixer, and the T die force is also extruded on a stainless steel endless belt running 20 mm below the die. It was cast into.
- the ⁇ film peeled self-supporting gel film from the end-less belt after heating at 130 ° CX 100 seconds (volatile content 30 weight 0/0) tenter The film was fixed to a clip and dried and imidized at 300 ° CX for 30 seconds, 400 ° CX for 30 seconds, and 500 ° CX for 30 seconds to obtain a polyimide film having a thickness of 18 ⁇ m.
- the obtained polyimide film was non-thermoplastic.
- a PMDA 7 wt. 0 / oDMF solution was gradually added to the prepolymer obtained by adding and stirring the first PMDA, and the viscosity was increased to 3000 boise to obtain a polyamic acid solution.
- the obtained polyamic acid solution was cast on a 25 ⁇ m-thick PET film (Therapy HP, manufactured by Toyo Metallizing Co., Ltd.) to a final thickness of 20 ⁇ m, and dried at 120 ° C. for 5 minutes. .
- the dried self-supporting film is peeled off from the PET film, fixed to a metal pin frame, and dried at 200 ° C for 5 minutes ⁇ 250 ° C for 5 minutes ⁇ 300 ° C for 5 minutes Went.
- the obtained polyimide film was used to determine plasticity, it was thermoplastic.
- Example 1 it took 20 hours from the start of polymerization to obtain a 10000 m long film.
- an imidic acid accelerator composed of acetic anhydride Z isoquinoline ZDMF (weight ratio 2.0 / 0. 3/4. 0) was added to the polyamic acid solution. Then, the mixture was added at a weight ratio of 45%, continuously stirred by a mixer, extruded from a T die carder, and traveled 2 Omm below the die and cast on a stainless endless belt. This resin film is heated at 130 ° CX for 100 seconds, and then the self-supporting gel film is peeled off from the endless belt (volatile content 30% by weight) and fixed to the tenter clip. 300 ° CX for 22 seconds, 400 ° CX 2 was dried and imidized for 2 seconds at 500 ° CX for 22 seconds to obtain a polyimide film having a thickness of 10 m.
- thermoplastic polyimide precursor obtained in Synthesis Example 1 is coated with a gravure coater so that the final thickness of the thermoplastic polyimide layer (adhesive layer) is 2 m. It was applied and heated in a drying oven set at 160 ° C for 1 minute.
- the heated imide was passed through a far-infrared heater furnace with an atmospheric temperature of 390 ° C for 20 seconds.
- the adhesive film was obtained.
- 18 m rolled copper foil (BHY-22B-T, manufactured by Japan Energy Co., Ltd.) on both sides of the resulting adhesive film, and protective material (Abi force 125NPI; manufactured by Kane force Co., Ltd.) on both sides of the copper foil , Polyimide film tension 0.4 NZcm, lamination temperature 380 ° C, laminating pressure 196 NZcm (20kgfZcm), laminating speed 1.5m Z A plate was made.
- the protective material was preheated by being held in contact with a heating roll for 3 seconds, and then laminated on the outside of the copper foil. Further, after lamination, the laminate was brought into contact with a heating roll for 0.2 seconds with the protective material placed, and then the protective material was peeled off after natural cooling was completed.
- the final single-sided surface is placed on both sides of an 18-m-thick polyimide film (Abical 18HPP, Kanechi Co., Ltd.).
- the coating was applied with a gravure coater to a thickness of 3.5 m, and heated in a drying oven set at 140 ° C for 1 minute.
- the film was passed through a far-infrared heater furnace having an atmospheric temperature of 390 ° C for 20 seconds to carry out heating imidization to obtain an adhesive film.
- 18 m rolled copper foil (BHY-22B-T, manufactured by Japan Energy Co., Ltd.) on both sides of the resulting adhesive film, and protective material (Abi force 125NPI; manufactured by Kane force Co., Ltd.) on both sides of the copper foil
- the film was continuously heat-laminated under the conditions of a polyimide film tension of 0.4 NZcm, a laminating temperature of 380 ° C., a laminating pressure of 196 NZcm (20 kgfZcm), and a laminating speed of 1.5 mZ to produce a flexible metal-clad laminate.
- Comparative Example 1 The same operation as in Comparative Example 1 was performed except that a 20 / zm-thick polyimide film (Abical 20NPP, manufactured by Kanechi Co., Ltd.) was used as the core film, and the coating thickness was 2 m per side. And a flexible metal-clad laminate was produced.
- a 20 / zm-thick polyimide film (Abical 20NPP, manufactured by Kanechi Co., Ltd.) was used as the core film, and the coating thickness was 2 m per side.
- a flexible metal-clad laminate was produced.
- Comparative Example 1 The same operation as in Comparative Example 1 was performed except that a 12.5 m thick polyimide film (Abical 12.5 NPP, manufactured by Kanechi Co., Ltd.) was used as the core film and the coating thickness was 1.5 m per side. And a flexible metal-clad laminate was produced.
- a 12.5 m thick polyimide film (Abical 12.5 NPP, manufactured by Kanechi Co., Ltd.) was used as the core film and the coating thickness was 1.5 m per side.
- a flexible metal-clad laminate was produced.
- Tables 2 and 3 show the evaluation results of the properties of the polyimide films and flexible metal-clad laminates obtained in the examples and comparative examples.
- Example 9 using a core film having all the characteristics within the predetermined range.
- the polyimide film useful for the present invention effectively suppresses dimensional changes that occur when a flexible metal-clad laminate is manufactured. Therefore, even when a laminate is produced by the hot roll lamination method, it is possible to suppress the occurrence of dimensional changes due to heating when various processes are performed on the laminate.
- the present invention can be used not only in the field of producing various resin molded articles represented by polyimide-containing adhesive films and laminates, but also with such adhesive films and laminates. It can be widely applied to the fields related to the production of electronic parts.
Abstract
Description
Claims
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US11/918,558 US8338560B2 (en) | 2005-04-25 | 2006-04-25 | Polyimide film and use thereof |
JP2007514749A JPWO2006115258A1 (ja) | 2005-04-25 | 2006-04-25 | 新規なポリイミドフィルムおよびその利用 |
CN2006800137332A CN101163734B (zh) | 2005-04-25 | 2006-04-25 | 新型聚酰亚胺膜及其利用 |
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JP (1) | JPWO2006115258A1 (ja) |
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JP2008188843A (ja) * | 2007-02-02 | 2008-08-21 | Kaneka Corp | ポリイミド前駆体溶液の多層膜、多層ポリイミドフィルム、片面金属張積層板、および多層ポリイミドフィルムの製造方法 |
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CN101163734A (zh) | 2008-04-16 |
JPWO2006115258A1 (ja) | 2008-12-18 |
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CN101163734B (zh) | 2011-11-23 |
US20080305316A1 (en) | 2008-12-11 |
US8338560B2 (en) | 2012-12-25 |
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