WO2007111268A1 - 銅配線ポリイミドフィルムの製造方法および銅配線ポリイミドフィルム - Google Patents
銅配線ポリイミドフィルムの製造方法および銅配線ポリイミドフィルム Download PDFInfo
- Publication number
- WO2007111268A1 WO2007111268A1 PCT/JP2007/056076 JP2007056076W WO2007111268A1 WO 2007111268 A1 WO2007111268 A1 WO 2007111268A1 JP 2007056076 W JP2007056076 W JP 2007056076W WO 2007111268 A1 WO2007111268 A1 WO 2007111268A1
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- WIPO (PCT)
- Prior art keywords
- copper foil
- polyimide film
- copper
- polyimide
- laminated
- Prior art date
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Classifications
-
- 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
-
- 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
- H05K3/10—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern
- H05K3/108—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern by semi-additive methods; masks therefor
-
- 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
- H05K1/09—Use of materials for the conductive, e.g. metallic pattern
-
- 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
-
- 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
-
- 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
- H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
- H05K2203/02—Details related to mechanical or acoustic processing, e.g. drilling, punching, cutting, using ultrasound
- H05K2203/0264—Peeling insulating layer, e.g. foil, or separating mask
-
- 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
- H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
- H05K2203/03—Metal processing
- H05K2203/0353—Making conductive layer thin, e.g. by etching
-
- 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
- H05K3/025—Processes for manufacturing precursors of printed circuits, i.e. copper-clad substrates by transfer of thin metal foil formed on a temporary carrier, e.g. peel-apart copper
-
- 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
- H05K3/40—Forming printed elements for providing electric connections to or between printed circuits
- H05K3/42—Plated through-holes or plated via connections
- H05K3/425—Plated through-holes or plated via connections characterised by the sequence of steps for plating the through-holes or via connections in relation to the conductive pattern
- H05K3/427—Plated through-holes or plated via connections characterised by the sequence of steps for plating the through-holes or via connections in relation to the conductive pattern initial plating of through-holes in metal-clad substrates
-
- 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
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/11—Methods of delaminating, per se; i.e., separating at bonding face
-
- 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
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
- Y10T428/24917—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.] including metal layer
-
- 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
- Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
- Y10T428/263—Coating layer not in excess of 5 mils thick or equivalent
- Y10T428/264—Up to 3 mils
- Y10T428/265—1 mil or less
Definitions
- the present invention relates to a method for producing a copper wiring polyimide film having fine wiring by a semi-additive method using a copper foil laminated polyimide film with a carrier.
- the copper foil laminated polyimide film has the advantage of being thin and lightweight, and is therefore suitable for high-performance electronic devices, especially small and light-weighted boards.
- FPCs high-density wiring flexible circuit boards
- TAB tapes Used for 'automated' bonding
- Patent Document 1 discloses a laminate in which a metal layer is provided on one side or both sides of a synthetic resin film, and the metal layer is a metal foil of 5 microns or less. Specifically, it is described that a circuit with a copper foil thickness of 3 ⁇ m and a line and space of 25 ⁇ m and 25 m (pitch 50 ⁇ m) was formed.
- Patent Document 2 discloses a copper-clad laminate including a copper foil having a thickness of 1 to 8 ⁇ m, an adhesive layer mainly composed of thermoplastic polyimide resin, and a heat-resistant film.
- the claim of Patent Document 3 is a laminate in which a thermoplastic polyimide film is formed on at least one surface of a non-thermoplastic polyimide film, and a copper foil is laminated on the surface of the thermoplastic resin layer, A metal laminate having a copper foil thickness of 5 ⁇ m or less is disclosed.
- Patent Document 4 in order to improve the visibility of the wiring pattern, the roughness of the adhesive surface with the copper foil film is reduced (for example, R Z is 1. O / zm).
- R Z is 1. O / zm.
- Patent Literature l WO2002Z034509
- Patent Document 2 Japanese Patent Laid-Open No. 2002-316386
- Patent Document 3 JP 2003-071984
- Patent Document 4 Japanese Unexamined Patent Application Publication No. 2004-042579
- Patent Document 5 Japanese Unexamined Patent Application Publication No. 2004-098659
- Patent Document 6 WO03Z. No. 96776
- An object of the present invention is to provide a method for producing a copper wiring polyimide film having a very small pitch and excellent linearity by a semi-additive method using a copper foil laminated polyimide film with a carrier.
- the present invention relates to the following items.
- a wiring pattern including a copper wiring portion having a pitch of 20 to 45 / ⁇ ⁇ pitch can be formed on the upper surface of the copper foil of the copper foil laminated film prepared in step (a), and has an opening corresponding to the wiring pattern.
- the manufacturing method of the copper wiring polyimide film characterized by having.
- the step (a) includes:
- the step (b) includes a step of forming a plating resist layer on the surface of the copper foil, a step of exposing through a photomask, and a step of forming an opening of the plating resist pattern layer by development. 4.
- the step (e) is characterized in that the step (e) is performed by flash etching.
- the polyimide film constituting the provided copper foil laminated polyimide film with a carrier is a single layer of a highly heat-resistant aromatic polyimide layer or a thermocompression bonding polyimide layer laminated on one side. 7.
- Copper foil on the side laminated with the polyimide film on one or both sides of the polyimide film A copper foil laminated polyimide film with a carrier in which a copper foil with a carrier having a surface roughness Rz of 1.0 ⁇ m or less and a copper foil thickness of 1 to 8 ⁇ m is directly laminated.
- a copper wiring with a very small pitch having excellent linearity can be formed by a semi-additive method using a copper foil laminated polyimide film with a carrier.
- a copper wire with a very small pitch which has excellent long-term reliability (insulation between wires) and excellent visibility, on a polyimide film.
- the copper wiring polyimide film produced according to the present invention is a flexible printed circuit board.
- the copper foil laminated polyimide film with a carrier defined in the present invention can be used in a method for producing a copper wiring polyimide film having a fine pattern, and has an extremely high pitch copper wiring excellent in linearity. Thus, a substrate with excellent wiring visibility can be obtained.
- FIG. 1 is a process diagram for explaining an example of a process for producing a single-sided copper wiring polyimide film by a semi-additive method using a copper foil laminated polyimide film with a single-sided carrier.
- FIG. 2 is a process diagram illustrating an example of a process for producing a double-sided copper wiring polyimide film by a semi-additive method using a copper foil laminated polyimide film with a double-sided carrier.
- FIG. 3 is a process diagram for explaining an example of the manufacturing process up to formation of through holes from a copper foil laminated polyimide film with a double-sided carrier using a copper foil laminated polyimide film with a double-sided carrier.
- FIG. 4 is a view showing an SEM observation (1000 times) of the surface of a polyimide film having a 30 ⁇ m pitch copper wiring obtained in Example 2.
- FIG. 5 Surface of polyimide film having 30 ⁇ m pitch copper wiring obtained in Example 3 It is a figure which shows SEM observation (1000 times).
- FIG. 6 is a diagram showing SEM observation (1000 times) of the surface of a polyimide film having a 30 ⁇ m pitch copper wiring obtained in Comparative Example 1.
- Figure 1 shows an example of a method for producing a copper wiring polyimide film by a semi-additive method using a copper foil laminated polyimide film with a carrier.
- a known semi-additive method can be used.
- the surface roughness Rz on the side laminated with the polyimide film on one or both sides of the polyimide film is 1.0 m or less and 0.5 111 to 2 111
- a copper foil laminated film is prepared by directly laminating a copper foil having a thickness in the range of.
- This step (a) is generally in the sub-steps (a-1) to (a-3), that is, the thickness of the copper foil is in the range of 1 to 8 ⁇ m, and is laminated with the copper foil polyimide film.
- the step of providing a copper foil laminated polyimide film with a carrier (a—1), the step of peeling the carrier foil with the copper foil laminated polyimide film (a—2), an optional step, and the thickness of the copper foil Including the step (a-3) of thinning by etching to a range of 0.5 ⁇ m to 2 ⁇ m.
- the copper foil laminated polyimide film 1 with carrier provided in the step (a-1) has a structure in which a polyimide film 2 and a copper foil 3 with carrier 3 are laminated.
- the copper foil with carrier 3 has a structure in which a copper foil 4 and a carrier 5 are laminated.
- the thickness of the copper foil is in the range of 1 to 8 / ⁇ ⁇
- the surface roughness Rz on the side of the copper foil laminated with the polyimide film is 1.0 m or less.
- the carrier foil 5 is peeled from the copper foil laminated polyimide film 1 with a carrier, and the copper foil and the polyimide film are directly laminated. A copper foil laminate polyimide film is obtained.
- step (a-3) as shown in FIG. 1 (c), etching is performed as necessary in order to make the copper foil of the copper foil laminated polyimide film thinner (no-fetching). .
- the thickness of the copper foil is reduced to the range of 0.5 m to 2 m (in FIG. 1, the thinned copper foil is indicated by reference numeral 4 b).
- the half-etching step can be omitted.
- Half etching of the copper foil can be performed by appropriately selecting a known method. For example, a method of immersing a copper foil laminated polyimide film in a known half-etching solution, or a method of further thinning the copper foil by a method of spraying one fetch solution with a spray device can be used.
- a known one can be used, for example, a mixture of hydrogen peroxide and sulfuric acid, or a solution mainly composed of an aqueous solution of sodium persulfate. — 200 and Adecate CAP manufactured by Asahi Denki Kogyo.
- the next step (b) is a step of forming a metal resist pattern layer on the upper surface of the copper foil of the copper foil laminated film prepared in step (a).
- a photoresist layer 17 is provided on the copper foil of the copper foil laminated polyimide film, and then a wiring pattern mask is formed as shown in FIG. 1 (e).
- a wiring pattern mask is formed as shown in FIG. 1 (e).
- Use the photoresist layer to expose the wiring pattern Develop and remove the areas that will be From the opening where the resist has been developed and removed, a copper foil that becomes the wiring pattern appears. Since the resist opening (resist removal part) corresponds to the wiring pattern, the pattern of the opening line width, pitch, etc. is set so that a copper wiring part with a pitch of 20 to 45 m can be formed.
- a negative type or a positive type can be used, and a liquid form, a film form, or the like can be used.
- the photoresist typically includes a method of forming a negative dry film type resist on a copper foil by thermal lamination, or applying a positive liquid type resist and drying.
- a negative dry film type resist on a copper foil by thermal lamination, or applying a positive liquid type resist and drying.
- the negative type other than the exposed part is removed by development, while in the case of the positive type, the exposed part is removed by development.
- Dry film type resists can be easily obtained in thickness and thickness. Examples of negative dry film type photoresists include SPG-152 manufactured by Asahi Kasei and RY-3215 manufactured by Hitachi Chemical.
- a known agent for developing and removing the photoresist layer can be appropriately selected and used.
- a sodium carbonate aqueous solution eg, 1%) is sprayed.
- the photoresist layer can be developed and removed.
- a copper plating layer 10 is provided on the upper part of the copper foil from which the opening force is removed by removing the photoresist layer 17.
- the copper plating step can be carried out by appropriately selecting known copper plating conditions. For example, the exposed portion of the copper foil is washed with an acid or the like, typically in a solution mainly composed of copper sulfate. Copper foil can be used as a force sword electrode.
- Electrolytic copper plating can be performed at a current density of LOAZdm 2 to form a copper layer.
- a solution can be used.
- the photoresist layer 17 used as the photoresist is removed, and the copper foil covered with the photoresist pattern layer is exposed.
- the copper foil exposed at the portion where the plating resist pattern layer has been removed is removed to expose the polyimide film surface 8.
- the thin copper foil is usually removed by flash etching. This makes it possible to produce a copper wiring polyimide film.
- the flash etching solution used for flash etching a known one can be used, for example, a mixture of sulfuric acid and hydrogen peroxide, or a dilute aqueous solution of ferric chloride.
- the component include FE-830 manufactured by Sugawara Densan and AD-305E manufactured by Asahi Denka Kogyo.
- the thin copper foil is removed, the copper in the circuit portion (wiring) is also dissolved, but the etching amount necessary to remove the thin copper foil is small, so there is no substantial problem.
- a metal plating layer 9 such as tin plating is provided on at least a part of the copper wiring of the copper wiring polyimide film, so that the metal wiring copper wiring layer is provided.
- a imide film can be produced.
- FIG. 1 An example of a method for forming a circuit by a semi-additive method using a polyimide film in which copper foils with a carrier are laminated on both surfaces is shown in FIG.
- a polyimide film 100 in which copper foils with a carrier are laminated on both sides is prepared.
- This copper foil laminated polyimide film 100 has a copper foil 3 with a carrier, a polyimide film 2 and a copper foil 3 'with a carrier laminated in order, and the copper foils 3 and 3' with a carrier are copper foils 4 and 4 ', respectively. It is a laminate of carriers 5 and 5 '.
- the thickness of the copper foil is in the range of 1 to 8 / z m, and the surface roughness Rz on the side laminated with the polyimide film of the copper foil is 1.0 m or less.
- carrier foil 5 and carrier foil 5 are peeled off from copper foil laminated polyimide film 100 with double-sided carrier, and copper foil 4 and polyimide are removed.
- a double-sided copper foil laminated polyimide film in which the film and the copper foil 4 ′ are directly laminated is obtained.
- etching is performed to thin the copper foil (4, 4 ′) of the double-sided copper foil laminated polyimide film (half etching). .
- a through-hole 31 is formed on a part of the electrolytic copper foil and the polyimide layer on both sides of the double-sided copper foil laminated polyimide film using a laser or the like.
- a plurality of through holes can be provided. The order of hole formation and half-fitting may be reversed. Reduce the thickness of the copper foil to 0.5 m to 2 m by half-etching.
- the total thickness of the copper foil is also preferably in the range of 0.5 / ⁇ ⁇ to 2 / ⁇ ⁇ .
- a wiring pattern including a copper wiring portion with a pitch of 20-45 ⁇ m can be formed on the upper surface of the copper foil of the copper foil laminated film prepared in the step (a).
- a metal resist pattern layer having an opening corresponding to the wiring pattern is formed.
- a photoresist layer (17, 17,) is provided on the copper foil (4, 4,) of the copper foil laminated polyimide film, and then in FIG. 2 (f). As shown, the photoresist layer is exposed using a wiring pattern mask, and the portion that becomes the wiring pattern is developed and removed. A plurality of copper foil portions (32, 32 ') that become wiring patterns appear from the opening where the resist is developed and removed.
- the pattern of opening line width, pitch, etc. is set so that a copper wiring part with a pitch of 20 to 45 ⁇ m can be formed.
- the photoresist that can be used here is the same as that described in the first embodiment.
- next step (c) copper is formed on the upper part of the copper foil portion (32, 32 ') where an opener from which the photoresist layer (17, 17') is removed also appears.
- a plating layer (10, 10 ') is provided.
- the photoresist layer 17 used as a plating resist is removed, and the copper foil covered with the plating resist pattern layer is exposed.
- the exposed copper foil is removed from the portion where the plating resist pattern layer has been removed to expose the polyimide film.
- Thin copper foil is usually removed by flash etching.
- the double-sided copper wiring polyimide film 101 can be manufactured.
- the portions of the double-sided copper wiring polyimide film 101 where the copper has been removed by flash etching are indicated by symbols 8 and 8 '.
- the double-sided copper wiring formed in the upper part of the through hole of the double-sided copper wiring polyimide film 101 is conductive.
- the flash etching solution used for the flash etching the one described in Embodiment 1 can be used.
- a metal plating layer (9, 9 ') such as a tin plating is provided on at least a part of the copper wiring of the double-sided copper wiring polyimide film 101 as necessary.
- the double-sided copper wiring polyimide film 102 thus manufactured can be manufactured.
- FIGS. 2 (a) to (c) Another example of the process (FIGS. 2 (a) to (c)) for first forming the through hole 31 in the second embodiment will be described with reference to FIGS. 3 (a) to (d).
- a polyimide film 100 in which copper foils with a carrier are laminated on both sides similar to that of Embodiment 2 is prepared.
- a process for forming a through hole 31 is performed using a laser or the like on part of the electrolytic copper foil and the polyimide layer on both sides of the double-sided copper foil laminated polyimide film.
- a through hole may be formed in the carrier 5 ′.
- the copper via 4 'and the carrier 5' may be left to form a blind via.
- a plurality of through holes or blind vias can be provided.
- the carrier 5 ′ in the state of 3 (b) or FIG. 3 (c) can be effectively used as a film support or as a protective material when processing through holes.
- the carrier 5 ' is peeled off, and etching is performed to make the copper foil (4, 4,) of the double-sided copper foil laminated polyimide film thinner as necessary (Herfeeting).
- the through hole or the blind via hole is formed before or after the carrier foil on one side or both sides is peeled off, and after the copper foil on one side or both sides and a part of the polyimide film are removed with, for example, a UV-YAG laser. It can be done by removing at the same time.
- the copper foil at the part where the hole is to be made in the polyimide film is removed in advance by etching or the like, and then the polyimide film is removed by irradiation with a carbon dioxide gas laser to form a blind via, or punch or May form a hole penetrating both sides with a drill.
- via formation for conducting a hole is simultaneously performed by electroplating at the time of forming a wiring portion by pattern plating (step (c)).
- desmearing is performed in the through-holes or blind vias.
- a conductive film is formed in the through-holes or blind vias by the so-called DPS (Direct Plating System) method in which a palladium-tin film is formed using a palladium-tin colloidal catalyst. Form a film.
- DPS Direct Plating System
- Electrolytic copper plating is performed at a current density of LOAZdm 2 to form a copper layer in the hole and on the circuit parts on both sides. This state is the structure shown in Fig. 2 (g).
- Ebara Eugene's risertron DPS system can be mentioned.
- the surface is treated with an aqueous solution mainly composed of monoethanolamine to form a state that facilitates the adsorption of the radium-tin colloidal catalyst, and then the thin copper foil is treated with a soft etching solution.
- aqueous solution mainly composed of monoethanolamine
- the thin copper foil is treated with a soft etching solution.
- a soft etching solution hardly remove the surface, suppress the formation of palladium mu tin film on the copper foil surface, and ensure the adhesion strength between the copper foil surface and electrolytic plating.
- a Pd-Sn film is formed by an activating process in which the solution is immersed in a palladium-tin colloid solution, and finally, an alkaline accelerator bath containing sodium carbonate, potassium carbonate and copper ions and sulfuric acid are contained.
- an alkaline accelerator bath containing sodium carbonate, potassium carbonate and copper ions and sulfuric acid are contained.
- a reducing agent may be added to the alkaline accelerator used in the active bath. Examples of reducing agents that can be added
- aldehydes such as formaldehyde, acetoaldehyde, propionaldehyde, benzaldehyde, catechol, resorcin, and ascorbic acid.
- a bath containing sodium carbonate, potassium carbonate and copper ions is preferable.
- UV-YAG laser Electro Mouth 'Scientific' manufactured by Industries (ESI), model 5320, wavelength 355 m] trowel, laser processing on both sides of electrolytic copper foil and polyimide layer to form through-hole VIA A through hole is formed.
- Desmear 1 After removal by the process, a conductive film is formed by the risertron DPS process of Ebara Eugene. After laminating a dry film type negative photoresist (SPG-152, manufactured by Asahi Kasei) on a DPS-treated copper foil with a 110 ° C hot roll, the areas other than the circuit formation part (wiring pattern) and the part that becomes the through hole are exposed. Remove the unexposed resist by spray development with 1% sodium carbonate aqueous solution at 30 ° C for 20 seconds.
- SPG-152 dry film type negative photoresist
- the thin copper foil is used as a force sword electrode in a copper sulfate plating bath at a current density of 2AZdm 2 at 25 ° C, 30 Electrolytic copper plating is performed for a minute, and a pattern plating with a thickness of 10 m on the inside of the through-hole in which the conductive film is formed and copper plating is performed.
- a 2% aqueous solution of caustic soda was sprayed at 42 ° C for 15 seconds, the resist layer was peeled off, and then a flash etching solution (AD-305E manufactured by Asahi Denki Kogyo Co., Ltd.) was sprayed at 30 ° C for 30 seconds. Removal of unnecessary thin-film copper can yield a polyimide film with copper wiring on both sides with a 30 ⁇ m pitch.
- the copper wiring polyimide film formed by the production method of the present invention has a pitch of 20 to 45 ⁇ m, preferably a pitch of 22 to 42 ⁇ m, more preferably a pitch of 24 to 40 ⁇ m, more preferably 25 to 25 ⁇ m. It has a copper wiring portion with a pitch of 36 ⁇ m, particularly preferably with a pitch of 26-30 ⁇ m.
- the pitch is the width that combines the copper wiring and the space between the copper wiring
- the 30 m pitch indicates 15 m of copper wiring and 15 m of space between the copper wiring as an example.
- the copper wiring polyimide film can be further subjected to metal plating such as tin plating on at least a part of the copper wiring.
- the copper foil laminated film prepared in step (a) is: On one or both sides of the polyimide film,
- the surface roughness Rz on the side laminated with this polyimide film is 1. O / zm or less, more preferably ⁇ to 0.8 m or less, more preferably ⁇ to 0.7 m or less, (2) A range of 0.5 m to 2 m, preferably 0.7 ⁇ m to 2 ⁇ m, more preferably 0.8 ⁇ m to l.8 m, particularly preferably 0.8 m to l.5 m.
- the copper foil laminated polyimide film with carrier has a surface roughness Rz of not more than 1.0 ⁇ m on one or both sides of the polyimide film and the thickness of the copper foil. Copper foil with carrier that is 1-8 ⁇ m is directly laminated.
- the thickness of the carrier is not particularly limited, but the thickness of the carrier is preferably 10 to 40 111, more preferably, as long as the thin copper foil can be reinforced.
- the thickness is 10 to 35 ⁇ m, more preferably 10 to 18 ⁇ m.
- the thickness of the copper foil 4 is preferably 1 to 8 ⁇ m, more preferably 1 to 6 ⁇ m, more preferably 2 to 5 ⁇ m, more preferably 2 to 4 ⁇ m, and laminated with a polyimide film of the copper foil.
- the surface roughness Rz on the side to be coated is preferably 1. O ⁇ m or less, more preferably 0. or less, and even more preferably 0.7 m or less.
- copper and copper alloys such as electrolytic copper foil and rolled copper foil can be used, and rolled copper foil can be particularly preferably used.
- the carrier of the copper foil with a carrier is not particularly limited in material, but can be applied to the copper foil, strengthening and protecting the copper foil, easily peeling off the copper foil, and laminating the polyimide.
- an aluminum foil, a copper foil, or a resin coated with a metal coating can be used as long as it has a role to withstand the temperature.
- the carrier foil since the copper component that becomes the electrolytic copper foil is electrodeposited on the surface of the carrier foil, the carrier foil needs to have at least conductivity.
- a carrier foil that flows through a continuous manufacturing process and maintains a state of being bonded to the copper foil layer and facilitating handling at least until the end of the production of the copper foil laminated polyimide film is used. it can.
- the carrier foil is obtained by laminating a copper foil with a carrier foil on a polyimide film and then removing the carrier foil by peeling force S. After laminating the copper foil with a carrier foil on a polyimide film, the carrier foil is etched. Can be used.
- the copper foils with a carrier those in which the carrier and the copper foil are bonded with a metal or ceramic bonding agent are excellent in heat resistance and can be suitably used.
- the copper foil with carrier is at least one surface laminated with the polyimide film, at least one metal selected from Ni, Cr, Co, Zn, Sn and Mo or an alloy containing at least one of these metals, Surface-treated materials such as chemical treatment, anti-bacterial treatment, heat-resistant treatment, and chemical-resistant treatment can be used, and those treated with silane coupling can be used.
- the polyimide film 1 can be directly laminated with the copper foil of the copper foil with carrier, and electronic parts such as printed wiring boards, flexible printed circuit boards, TAB tapes, COF boards, etc.
- electronic parts such as printed wiring boards, flexible printed circuit boards, TAB tapes, COF boards, etc.
- Examples thereof include a polyimide film used as a base material, a polyimide obtained from an acid component and a diamine component constituting the polyimide film, or a polyimide containing an acid component and a diamine component constituting the polyimide film.
- the linear expansion coefficient (50 to 200 ° C) is close to the linear expansion coefficient of the copper foil laminated on the polyimide film. ) is preferably 0. 5 X 10 _5 ⁇ 2. 8 X 10 _5 cmZcmZ ° C.
- the polyimide film one having a thermal shrinkage of 0.05% or less is preferable because of its small thermal deformation.
- the polyimide film can be used in the form of a single layer, a multilayer film in which two or more layers are laminated, or a sheet.
- the thickness of the polyimide film is not particularly limited, but it is preferable if it can be laminated with a copper foil with a carrier foil without any problem, can be manufactured and handled, and can sufficiently support the copper foil. Is preferably 1 to 500 ⁇ m, more preferably 2 to 300 ⁇ m, further preferably 5 to 200 m, more preferably 7 to 175 ⁇ m, and particularly preferably 8 to 100 ⁇ m.
- a substrate on which at least one surface of the substrate is subjected to surface treatment such as corona discharge treatment, plasma treatment, chemical roughening treatment, physical roughening treatment, or the like can also be used.
- the polyimide film of the copper foil laminated polyimide film with a carrier is a heat-resistant polyimide layer.
- a multilayer polyimide film of at least two or more layers having a thermocompression bonding polyimide layer (a) that can be directly laminated with copper foil under pressure or pressure heating on one side or both sides of (b) is used. it can.
- the copper foil laminated polyimide film with a carrier is laminated by pressurizing or heat-pressing the heat-resistant polyimide layer (b) and the copper foil with a carrier through the thermocompression bonding polyimide layer (a). Can be used.
- the trade name “Iupiretus (S or R)” (manufactured by Ube Industries)
- the trade name “Kapton” (manufactured by Toray DuPont
- a polyimide film obtained from an acid component and a diamine component constituting these films the trade name “Iupiretus (S or R)” (manufactured by Ube Industries)
- the trade name “Kapton” manufactured by Toray DuPont
- the polyimide film can be produced by a known method.
- a single-layer polyimide film For example, in the case of a single-layer polyimide film,
- a polyamic acid solution which is a polyimide precursor, is cast or coated on a support, and a polyamic acid solution, which is a polyimide precursor of the second layer or more, is cast or coated on the support before successive steps.
- a heating device When laminating a copper foil with a carrier foil and a polyimide film, a heating device, a pressurizing device or a heating and pressurizing device can be used, and the heating conditions and pressurizing conditions are appropriately selected depending on the materials used.
- V is not particularly limited as long as it can be laminated continuously or batchwise, but it is preferred to carry out continuously using a roll laminate or a double belt press.
- a method for producing a copper foil laminated polyimide film with a carrier the following method may be mentioned.
- three copper foils with a long (200 to 2000 m long) carrier, a long polyimide film, and a copper foil with a long carrier are stacked in this order, and further if necessary.
- a protective film is placed on the outside, and it is preferably in-line immediately before introduction, preferably about 150 to 250 ° C, in particular a hot air supply device so that it can be preheated at a temperature higher than 150 ° C and lower than 250 ° C for about 2 to 120 seconds.
- Preheat using a preheater such as an infrared heater.
- the temperature of the heating and crimping zone of the pair of crimping rolls or double belt press is 20 ° C higher than the glass transition temperature of polyimide.
- thermocompression bonding is performed under pressure in the temperature range of 400 ° C, which is 30 ° C higher than the glass transition temperature.
- a double belt press it is subsequently cooled under pressure in a cooling zone.
- the temperature is preferably 20 ° C or more lower than the glass transition temperature of polyimide.
- a copper foil laminated polyimide film with a single-sided or double-sided carrier can be produced.
- thermocompression bonding By preheating the polyimide film before thermocompression bonding, it is possible to prevent appearance defects due to foaming of the laminate after thermocompression bonding due to moisture contained in the polyimide, or to form a solder bath when forming an electronic circuit. By preventing foaming during immersion, product yields can be prevented from becoming worse.
- the double belt press can perform high-temperature heating and cooling under pressure, and is preferably a hydraulic type using a heat medium.
- the copper foil layer polyimide film with double-sided carrier foil can be suitably obtained at a take-up speed of lmZ or more by laminating by thermocompression under pressure and cooling using a double belt press.
- Copper foil laminated polyimide film with double-sided carrier is long and wide, about 400 mm or more, especially about 500 mm or more, and has high adhesive strength (the peel strength between metal foil and polyimide film is 0.7 NZmm or more, 150 ° (The retention of peel strength is 90% or more even after heat treatment with C for 168 hours), to obtain a copper foil laminated polyimide film with a double-sided carrier with a good appearance so that no wrinkles are substantially observed on the copper foil surface Can do.
- thermocompression bonding polyimide film and copper foil copper foil with carrier and both sides of outermost layer
- a protective material that is, two protective materials
- any material can be used as long as it is non-thermocompressible and has good surface smoothness.
- metal foil particularly copper foil, stainless steel foil, aluminum foil, high heat resistant polyimide, etc.
- a film having a thickness of about 5 to 125 ⁇ m such as a film (manufactured by Ube Industries, Upilex S, Kapton H manufactured by Toray DuPont) is preferably mentioned.
- the heat-resistant polyimide layer (b) can be used as a tape material for electronic parts such as a printed wiring board, a flexible printed circuit board, a TAB tape, and a COF board. It is preferable to use the heat-resistant polyimide that forms the base film.
- the heat-resistant polyimide of the heat-resistant polyimide layer (b layer) has at least one of the following characteristics and at least two of the following characteristics. [A combination of 1) and 2), 1) and 3), 2) and 3)], in particular, those having all of the following characteristics.
- a single polyimide film having a glass transition temperature of 300 ° C or higher, preferably a glass transition temperature of 330 ° C or higher, and more preferably unidentifiable.
- linear expansion coefficient (50 to 200 ° C) (MD) force Heat resistant grease A metal foil that is preferably close to the thermal expansion coefficient of a metal foil such as copper foil laminated on a substrate is preferred.
- thermal expansion coefficient when the heat resistance ⁇ substrate using a copper foil Te is 5 X 10 _6 ⁇ 28 X 10 _6 cmZc mZ ° is preferably a C instrument 9 X 10 one 6 ⁇ 20 X 10 _6 cmZcmZ ° C there is rather preferable, is preferably further 12 X 10 _6 ⁇ 18 X 10 _6 cmZcmZ ° C.
- MD tensile modulus
- a diamine component containing at least 70 mol% or more, more preferably 80 mol% or more, and more preferably 90 mol% or more, and a polyimide that can also provide strength can be used.
- the diamine component capable of obtaining the heat-resistant polyimide of the heat-resistant polyimide layer (b) in addition to the diamine component shown above, m-phenol-diamine, 3 , 4'-diaminodiphenyl ether, 3, 3, -diaminodiphenylsulfide, 3,4, -diaminodiphenylsulfide, 4,4, -diaminodiphenylsulfide, 3, 3, -diaminodiphenylsulfone, 3,4'-diaminodiphenyl Sulfone, 4,4'-Diaminodiphenylsulfone, 3,3'-Diaminobenzophenone, 4,4'-Diaminobenzophenone, 3,4'-Diaminobenzophenone, 3,3'-Diaminodiphenenomethane, 4,4'-Diaminodiphenylmethane 3, 4'-diaminodiphenylmethane
- Thermocompression bonding polyimide layer (a layer) is a printed wiring board, flexible printed circuit board, TA
- B tape, COF substrate and other electronic component tape materials or heat-resistant polyimide and copper foil can be heat-bonded (thermocompression bonding), or heat-bonded under pressure (thermocompression bonding)
- a known polyimide can be used.
- thermocompression bonding polyimide of the thermocompression bonding polyimide layer preferably has a thermocompression bonding property that can be bonded to a copper foil at a temperature of not less than the glass transition temperature of the thermocompression bonding polyimide and a force of 400 ° C or less. It is a polyimide having.
- thermocompression bonding polyimide layer (a layer) of the thermocompression bonding polyimide film further has at least one of the following characteristics and at least two of the following characteristics.
- thermocompression bonding polyimide layer (layer a) has a peel strength of at least 0.7 NZmm between the copper foil and the a layer, or the copper foil and the thermocompression bonding polyimide film, even after heat treatment at 150 ° C for 168 hours.
- the polyimide must have a strength retention of 90% or higher, more than 95%, especially 100% or higher.
- the glass transition temperature is 130-330 ° C.
- thermocompression-bondable polyimide layer (a layer)
- thermocompression bonding polyimide layer As an example of a combination of an acid component and a diamine component that can obtain a polyimide of a thermocompression bonding polyimide layer (a layer),
- Diamine components include 1,3 bis (4 aminophenoxy) benzene, 1,3 bis (3 —aminophenoxy) benzene 4, 4'-bis (3-aminophenoxy) biphenyl, bis [4— (
- the diamine component capable of obtaining the polyimide of the thermocompression-bondable polyimide layer (a layer) in addition to the diamine component shown above, m-phenylenediamine, 3, as long as the properties of the present invention are not impaired.
- the polyimide of the heat-resistant polyimide layer (b layer) and the polyimide of the heat-sealable polyimide layer (a layer) can be synthesized by a known method, such as random polymerization, block polymerization, or a combination of force. This can also be achieved by a V-deviation method in which a number of polyimide precursor solutions or polyimide solutions are synthesized, and a plurality of solutions are mixed and then mixed under reaction conditions to obtain a uniform solution.
- the polyimide of the heat-resistant polyimide layer (b layer) and the polyimide of the heat-sealable polyimide layer (a layer) are composed of an acid component and a diamine component in an organic solvent of about 100 ° C or less, and 80 ° C In the following, it is further reacted at a temperature of 0 to 60 ° C., particularly at a temperature of 20 to 60 ° C. for about 0.2 to 60 hours to obtain a polyimide precursor solution, and this polyimide precursor solution is used as a dope solution. Then, a thin film of the dope solution can be formed, and the solvent can be evaporated and removed from the thin film, and the polyimide precursor can be imidized.
- the reaction is performed at a temperature of 150 ° C or less, especially 15-50 ° C by adding a force to heat the polyimide precursor solution to 150-250 ° C or by adding an imidizing agent.
- the solvent is evaporated or precipitated in a poor solvent to obtain a powder. Thereafter, the powder can be dissolved in an organic solution to obtain an organic solvent solution of polyimide.
- the concentration of all monomers in the organic polar solvent may be appropriately selected according to the purpose of use and the purpose of production.
- a heat-resistant polyimide layer (b
- the polyimide precursor solution of the heat-fusible polyimide layer (layer a) is preferably in a ratio of the concentration power of all monomers in the organic polar solvent ⁇ -15% by mass, especially 2-8% by mass, .
- the solution viscosity depends on the purpose of use.
- Polyamic (polyimide precursor) acid solution which can be selected appropriately according to the purpose of application (coating, casting, etc.) and manufacturing, has a rotational viscosity measured at 30 ° C of about 0.1 to 5000 boise, especially Ability to be about 0.5 to 2000 poises, more preferably about 1 to 2000 poises.
- the ability to handle this polyamic acid solution is also preferable. Therefore, it is desirable to carry out the polymerization reaction to such an extent that the produced polyamic acid exhibits the above viscosity.
- the heat-fusible polyimide layer (a layer) can be used by preparing a polyimide precursor solution by the above-described method and newly adding an organic solvent thereto and diluting it.
- the polyimide of the heat-resistant polyimide layer (b layer) and the polyimide of the heat-sealable polyimide layer (a layer) are approximately equimolar amounts of the diamine component and tetracarboxylic dianhydride, and the diamine component is in a slightly excessive amount.
- a slightly excess amount of the acid component may be reacted in an organic solvent to cause a solution of the polyimide precursor (if the uniform solution state is maintained, it may be partially converted to S-imidation).
- the polyimide of the heat-resistant polyimide layer (b layer) and the polyimide of the heat-fusible polyimide layer (a layer) are dicarboxylic anhydrides such as phthalic anhydride and its substitutes for sealing the amine terminal.
- dicarboxylic anhydrides such as phthalic anhydride and its substitutes for sealing the amine terminal.
- the polyimide of the heat-resistant polyimide layer (b layer) and the polyimide of the heat-sealable polyimide layer (a layer) are composed of all acid anhydrides in diamine (as the number of moles of amino groups) in an organic solvent.
- the number of moles (as total moles of acid anhydride groups of tetraic dianhydride and dicarboxylic anhydride) from 0.95 to 1.05, especially from 0.98 to L02, In particular, it is preferably from 0.99 to L01.
- dicarboxylic acid anhydride each component can be reacted in such a ratio that the ratio of tetracarboxylic dianhydride to molar amount of acid anhydride group is 0.05 or less.
- Phosphorus stabilizers such as triphosphite for the purpose of limiting the gel of the polyimide precursor -L, phosphoric acid triphenyl, etc. can be added in the range of 0.01 to 1% with respect to the solid content (polymer) concentration during polyamic acid polymerization.
- a basic organic compound can be added to the dope solution.
- imidazole, 2-imidazole, 1,2-dimethylimidazole, 2-phenylimidazole, benzimidazole, isoquinoline, substituted pyridine and the like are used as the imidic acid accelerator with respect to the polyamic acid.
- it can be used at a ratio of 0.1 to 2% by weight. Since these form a polyimide film at a relatively low temperature, they can be used to avoid insufficient imidization.
- an organoaluminum compound, an inorganic aluminum compound, or an organotin compound may be added to the polyamic acid solution for a heat-fusible polyimide.
- aluminum hydroxide, aluminum triacetylacetonate, etc. can be added as aluminum metal to polyamic acid in an amount of 1 ppm or more, particularly 1 to: LOOOppm.
- the organic solvents used for the production of polyamic acid are N-methyl-2-pyrrolidone, N, N-dimethylformamide, N, N-dimethylacetamide, N, N-jetylacetamide, dimethyl. Examples include sulfoxide, hexamethylphosphoramide, N-methylcaprolatatam, and cresols. These organic solvents may be used alone or in combination of two or more.
- the polyimide film having thermocompression bonding is preferably prepared by (i) co-extrusion and one-cast film forming method (also simply referred to as multi-layer extrusion method) and heat-resistant polyimide layer (b layer) dope solution and heat.
- a method of obtaining a multilayer polyimide film by laminating a dope solution of a pressure-bonding polyimide layer (a layer), drying and imidization, (ii) or flowing a dope solution of a heat-resistant polyimide layer (b layer) on a support By applying a dope solution of a thermocompression bonding polyimide layer (a layer) on one or both sides of a self-supporting film (gel film) that has been applied and dried, and then drying and imidizing to obtain a multilayer polyimide film. You can get it.
- the coextrusion method can be carried out by a known method, and for example, the method described in JP-A-3-180343 (JP-B-7-102661) can be used.
- thermocompression bonding polyimide film having thermocompression bonding on both sides is shown.
- Thickness of heat-resistant polyimide layer (b layer) by three-layer coextrusion method of polyamic acid solution for heat-resistant polyimide layer (b layer) and polyamic acid solution for thermocompression bonding polyimide layer (a layer) Is supplied to a three-layer extrusion die so that the total thickness of the thermocompression-bondable polyimide layer (a layer) on both sides is 3 to: LO ⁇ m, and cast on a support. This can be cast-coated on a support surface such as a stainless steel mirror surface or a belt surface to obtain a polyimide film A which is a self-supporting film that is semi-cured or dried at 100 to 200 ° C.
- Polyimide film A a self-supporting film, has defects such as reduced adhesion in the production of polyimide films with thermocompression bonding when cast films are processed at temperatures higher than 200 ° C. Tend to come.
- This semi-cured state or an earlier state means being in a self-supporting state by heating and Z or chemical imidization.
- Polyimide film A of the obtained self-supporting film is a temperature not higher than the temperature at which deterioration occurs at a temperature higher than the glass transition temperature (Tg) of the thermocompression bonding polyimide layer (a layer), preferably 250 to 420 ° C. (Preferably heated for 0.1 to 60 minutes at this temperature), dried and imidized, and heated to the temperature of the heat-resistant polyimide layer (b layer).
- Tg glass transition temperature
- a polyimide film having a thermocompression bonding polyimide layer (a layer) on both sides can be produced.
- Polyimide film A of the obtained self-supporting film has a solvent and water content of preferably about 20 to 60% by mass, particularly preferably 30 to 50% by mass, and this self-supporting film.
- a solvent and water content preferably about 20 to 60% by mass, particularly preferably 30 to 50% by mass, and this self-supporting film.
- a temperature increase rate of 10 ° CZ or more is preferable.
- the linear expansion coefficient of the final polyimide film A can be reduced.
- the squeezing force higher than the drying temperature is preferably within a range of 200 to 550 ° C, particularly preferably at a high temperature within a range of 300 to 500 ° C, preferably 1 to: LOO Minutes, in particular 1 to: the self-supporting film is dried and heat-treated for LO minutes, preferably the final content of the organic solvent and water generated in the polyimide film is 1% by weight. Dissolve from the self-supporting film so that A polyimide film having thermocompression bonding on both surfaces can be formed by sufficiently removing the medium and the like and sufficiently performing the polymer imidization constituting the film.
- the fixing device for the self-supporting film for example, a belt-like or chain-like one provided with a large number of pins or gripping tools at regular intervals is supplied continuously or intermittently.
- a device in which a pair is installed along both side edges in the longitudinal direction of the film, and the film can be fixed while being moved continuously or intermittently with the movement of the film is preferable.
- the solidified film fixing device can stretch or shrink the film being heat-treated in the width direction or the longitudinal direction at an appropriate elongation or shrinkage ratio (particularly preferably a stretch ratio of about 0.5 to 5%). Even a device.
- the polyimide film having thermocompression bonding on both sides produced in the above process is preferably 100N to 400 ° C under low or no tension, preferably 4N or less, particularly preferably 3N or less.
- Heat treatment at a temperature, preferably for 0.1 to 30 minutes makes it possible to obtain a polyimide film having thermocompression bonding on both sides, particularly excellent in dimensional stability.
- the manufactured polyimide film having thermocompression bonding on both sides can be wound up in a tool shape by a suitable known method.
- the loss on heating of the self-supporting film is a value obtained by drying the film to be measured at 420 ° C for 20 minutes, and calculating from the following formula using the weight W1 before drying and the weight W2 after drying. It is.
- the imidation ratio of the self-supporting film can be obtained by a technique using a Karl Fischer moisture meter described in JP-A-9-316199.
- the self-supporting film may have a fine inorganic substance inside or on the surface layer! /, Or an organic additive.
- inorganic additives include particulate or flat inorganic fillers.
- organic additives include polyimide particles and thermosetting resin particles. The usage amount and shape (size, aspect ratio) are preferably selected according to the purpose of use.
- the heat treatment can be performed using various known apparatuses such as a hot air furnace and an infrared heating furnace.
- the single-sided or double-sided copper wiring polyimide film of the present invention can be used as a wiring material such as a flexible printed circuit board (FPC), tape “automated” bonding (TAB), and COF.
- Glass transition temperature (Tg) of polyimide film It was determined from the peak value of tan ⁇ by the dynamic viscoelasticity method (tensile method, frequency 6.28 mdZ seconds, heating rate 10 ° CZ min).
- Linear expansion coefficient of polyimide film (50-200 ° C): An average linear expansion coefficient of 20-200 ° C was measured by the TMA method (tensile method, heating rate 5 ° CZ min).
- the inside of the bag means the peel strength inside the wound metal foil laminated polyimide film
- the outside of the bag means the peel strength outside the wound metal foil laminated polyimide film
- MIT folding endurance (polyimide film): Tested with a width of 15 mm over the entire width according to JIS C6471. Specimen cut out, radius of curvature 0.38mm, load 9.8N, bending speed 175 times Z min., Left and right bending angle 135 degrees, measured the number of times until polyimide film breaks.
- PPD paraphenolene
- s BPDA 4,4'-biphenyltetracarboxylic dianhydride
- the dope for heat-resistant polyimide and the dope for thermocompression-bonding polyimide are made by changing the thickness of the three-layer extrusion die.
- the film was cast on a support and continuously dried with hot air at 140 ° C. to form a solidified film. After the solid film is peeled off, the strength of the substrate is gradually raised to 200 ° C and 450 ° C in a heating furnace, the solvent is removed, imidization is performed, and a long three-layer extruded polyimide film is formed. Was wound on a winding roll.
- the resulting three-layer extruded polyimide film exhibited the following physical properties.
- thermocompression bonding polyimide 240 ° C (dynamic viscoelasticity method, tan ⁇ peak value, the same applies hereinafter).
- Tg of heat-resistant polyimide 340 ° C or higher.
- Example 1 (Copper foil laminated polyimide film with carrier)>
- the adhesion strength between the copper foil and the polyimide film of the obtained copper foil laminated polyimide film with a carrier was 1.2 NZmm.
- Example 2 (Copper foil laminated polyimide film, production of copper wiring polyimide film by semi-additive method)>
- a 10.5 ⁇ 25 cm square sample was cut out from the copper foil laminated polyimide film with roll roll-like single-sided carrier prepared in Example 1, and the carrier foil was peeled off.
- the copper foil of the copper foil laminated polyimide film with the carrier foil peeled off was immersed in 25 ° C 'for 2 minutes using DP-200 made by EBARA Euglelite as the no fetching solution, and the thickness of the copper foil was reduced to 1 ⁇ m.
- a dry film type negative photoresist (SPG-152, manufactured by Asahi Kasei) is laminated on a half-etched copper foil with a 110 ° C hot roll, and then the areas other than the circuit formation area (wiring pattern) are exposed. Then, spray development with 1% aqueous sodium carbonate solution at 30 ° C for 20 seconds to remove the unexposed resist, degrease the exposed part of the thin copper foil, and wash it in a copper sulfate plating bath. the copper foil as a force cathode electrode at a current density of 2AZdm 2 performs 25 ° C, 30 min electrolytic copper plated, was subjected to pattern plated copper plated 10 m thickness.
- FIG. 4 shows an SEM (magnification: 1000 times) image of the surface of the obtained copper wiring polyimide film.
- the polyimide film having the obtained copper wiring was able to clearly confirm the copper wiring through the polyimide film from the opposite side of the polyimide film having the copper wiring.
- Example 1 as a copper foil with a carrier, a copper foil with a carrier made by Nippon Electrolytic Co., Ltd. (YSN AP-2S, carrier thickness 18 m, copper thickness 2 / zm, surface roughness of polyimide foil on the copper side RzO. 65 ⁇ m
- YSN AP-2S carrier thickness 18 m, copper thickness 2 / zm, surface roughness of polyimide foil on the copper side RzO. 65 ⁇ m
- a copper foil laminated polyimide film with a carrier was produced in the same manner as in Example 1 except that (2) was used.
- Using this copper foil laminated polyimide film with carrier a copper wiring polyimide film was produced in the same manner as in Example 2. During half-etching, the time was adjusted so that the copper foil thickness was 1 ⁇ m.
- the prepared copper wiring polyimide film was immersed in a tin plating solution (Rohm & Haas, LT-34H), and tin plating was applied to the surface of the copper wiring.
- Figure 5 shows an SEM image of the copper wiring polyimide film surface after tinning. It was confirmed that the polyimide film surface with high wiring linearity was also clean.
- Example 3 a copper wiring polyimide film was used and an electrical reliability test was performed. In the electrical reliability test, 52V DC voltage was applied in an environment of 85 ° C and 85% RH, and the resistance was measured. The initial resistance value was 10 13 ⁇ , and maintained 10 13 ⁇ even after exceeding 1000 hours.
- Example 2 instead of the copper foil with carrier (YSNAP-3S, carrier thickness 18 ⁇ m, copper thickness 3 ⁇ m, copper foil surface roughness RzO. 65 ⁇ m) used in Example 2, Nippon Electrolytic Co., Ltd. Copper foil with carrier (YSNAP-3B, carrier thickness 18 ⁇ m, copper thickness 3 ⁇ m, copper foil surface Except that the roughness (Rzl. 29 / zm) was used, a copper foil laminated polyimide film with a carrier was prepared in the same manner as in Example 1, and the copper wiring with 30 m pitch was prepared in the same manner as in Example 2. A polyimide film was obtained.
- the polyimide film having the obtained copper wiring was taken with SEM (magnification: 1000 times) of the polyimide film surface from which the copper foil between the copper wiring and the wiring was removed, and is shown in FIG. .
- the obtained polyimide film having a copper wiring is capable of confirming the copper wiring through the polyimide film from the opposite side of the polyimide film having the copper wiring. Clear confirmation was possible.
- the copper wiring polyimide film produced in Example 2 was subjected to an electrical reliability test under the same conditions as those of the copper wiring polyimide film of Example 3, and was 52 V in an environment of 85 ° C and 85% RH. When DC voltage is applied, the initial resistance value is 10 13 ⁇ , and it is considered that 10 13 ⁇ is maintained even after 1000 hours.
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- Wire Bonding (AREA)
- Manufacturing Of Printed Wiring (AREA)
Description
Claims
Priority Applications (3)
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JP2008507474A JPWO2007111268A1 (ja) | 2006-03-24 | 2007-03-23 | 銅配線ポリイミドフィルムの製造方法および銅配線ポリイミドフィルム |
US12/294,421 US20090136725A1 (en) | 2006-03-24 | 2007-03-23 | Process for producing copper wiring polyimide film, and copper wiring polyimide film |
CN2007800187798A CN101449633B (zh) | 2006-03-24 | 2007-03-23 | 用于制备铜布线聚酰亚胺膜的方法和铜布线聚酰亚胺膜 |
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Cited By (6)
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JP2010182865A (ja) * | 2009-02-05 | 2010-08-19 | Nitto Denko Corp | 配線回路基板の製造方法 |
JP2013038120A (ja) * | 2011-08-04 | 2013-02-21 | Fujikura Ltd | プリント配線板の製造方法 |
JP2016213446A (ja) * | 2015-05-12 | 2016-12-15 | サムソン エレクトロ−メカニックス カンパニーリミテッド. | 銅張積層板及びこれを用いたプリント回路基板の製造方法 |
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- 2007-03-23 CN CN2007800187798A patent/CN101449633B/zh not_active Expired - Fee Related
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JP2010182865A (ja) * | 2009-02-05 | 2010-08-19 | Nitto Denko Corp | 配線回路基板の製造方法 |
JP2013038120A (ja) * | 2011-08-04 | 2013-02-21 | Fujikura Ltd | プリント配線板の製造方法 |
JP2016213446A (ja) * | 2015-05-12 | 2016-12-15 | サムソン エレクトロ−メカニックス カンパニーリミテッド. | 銅張積層板及びこれを用いたプリント回路基板の製造方法 |
US10952329B2 (en) | 2015-05-12 | 2021-03-16 | Samsung Electro-Mechanics Co., Ltd. | Copper clad laminates and method for manufacturing a printed circuit board using the same |
US10461234B2 (en) | 2016-09-29 | 2019-10-29 | Nichia Corporation | Metal-base substrate, semiconductor device and method for manufacturing the same |
US11018288B2 (en) | 2016-09-29 | 2021-05-25 | Nichsa Corporation | Metal-base substrate and semiconductor device |
JP2020011439A (ja) * | 2018-07-18 | 2020-01-23 | 住友金属鉱山株式会社 | 銅張積層板 |
JP7087759B2 (ja) | 2018-07-18 | 2022-06-21 | 住友金属鉱山株式会社 | 銅張積層板 |
JP2021072369A (ja) * | 2019-10-31 | 2021-05-06 | 合同会社シナプス | 半導体パッケージ及びその製造方法 |
JP7412735B2 (ja) | 2019-10-31 | 2024-01-15 | 合同会社シナプス | 半導体パッケージの製造方法 |
Also Published As
Publication number | Publication date |
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CN101449633B (zh) | 2011-10-26 |
TW200808145A (en) | 2008-02-01 |
US20090136725A1 (en) | 2009-05-28 |
KR20090004961A (ko) | 2009-01-12 |
TWI437937B (zh) | 2014-05-11 |
JPWO2007111268A1 (ja) | 2009-08-13 |
CN101449633A (zh) | 2009-06-03 |
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