EP1590416A1 - Procede de collage de cartes de circuits imprimes flexibles - Google Patents

Procede de collage de cartes de circuits imprimes flexibles

Info

Publication number
EP1590416A1
EP1590416A1 EP03782461A EP03782461A EP1590416A1 EP 1590416 A1 EP1590416 A1 EP 1590416A1 EP 03782461 A EP03782461 A EP 03782461A EP 03782461 A EP03782461 A EP 03782461A EP 1590416 A1 EP1590416 A1 EP 1590416A1
Authority
EP
European Patent Office
Prior art keywords
adhesive film
resin
mass fraction
adhesive
fpcb
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP03782461A
Other languages
German (de)
English (en)
Inventor
Marc Husemann
Hans Karl Engeldinger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tesa SE
Original Assignee
Tesa SE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE10317403A external-priority patent/DE10317403A1/de
Application filed by Tesa SE filed Critical Tesa SE
Publication of EP1590416A1 publication Critical patent/EP1590416A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
    • C09J5/06—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers involving heating of the applied adhesive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • 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
    • C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
    • 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
    • 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
    • C09J7/10—Adhesives in the form of films or foils without carriers
    • 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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L21/00—Compositions of unspecified rubbers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; 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
    • C08L61/00—Compositions of condensation polymers of aldehydes or ketones; 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
    • C08L63/00—Compositions of epoxy resins; Compositions of derivatives of epoxy resins
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester 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
    • C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
    • C08L75/04—Polyurethanes
    • 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
    • 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
    • C09J2421/00—Presence of unspecified rubber
    • 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
    • C09J2423/00—Presence of polyolefin
    • 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
    • C09J2461/00—Presence of condensation polymers of aldehydes or ketones
    • 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
    • C09J2463/00—Presence of epoxy resin
    • 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
    • C09J2467/00—Presence of polyester
    • 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
    • C09J2467/00—Presence of polyester
    • C09J2467/006—Presence of polyester in the substrate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2475/00—Presence of polyurethane
    • 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
    • C09J2477/00—Presence of polyamide
    • 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
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/03—Use of materials for the substrate
    • H05K1/0393—Flexible materials
    • 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
    • H05K2201/0104—Properties and characteristics in general
    • H05K2201/0129—Thermoplastic polymer, e.g. auto-adhesive layer; Shaping of thermoplastic polymer
    • 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
    • H05K2201/0104—Properties and characteristics in general
    • H05K2201/0133—Elastomeric or compliant polymer
    • 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
    • H05K2201/02—Fillers; Particles; Fibers; Reinforcement materials
    • H05K2201/0203—Fillers and particles
    • H05K2201/0206—Materials
    • H05K2201/0209—Inorganic, non-metallic particles
    • 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]
    • Y10T428/31511—Of epoxy ether
    • 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]
    • Y10T428/31721—Of polyimide
    • 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]
    • Y10T428/31786—Of polyester [e.g., alkyd, etc.]

Definitions

  • the invention relates to the bonding of plastic parts, in particular flexible printed circuit boards (FPCB's).
  • FPCB's flexible printed circuit boards
  • Adhesive tapes are widely used processing aids in the age of industrialization. Adhesive tapes are subject to very high requirements, particularly for use in the electronic industry. There is currently a trend in the electronics industry towards ever narrower, lighter and faster components. In order to achieve this, ever greater demands are placed on the manufacturing process. This also applies to the so-called flexible printed circuit boards, which are very often used for electrical contacting of IC chips or conventional printed circuit boards.
  • FPCB Flexible Printed Circuit Boards
  • FPCBs are used in a variety of electronic devices such as B. cell phones, car radios, computers, represented.
  • FPCBs usually consist of layers of copper and polyimide, where appropriate the polyimide layer is glued to the copper foil.
  • FPCBs they are also glued together with other components. In the latter case, polyimide film is glued to polyimide film.
  • heat-activatable adhesive tapes are generally used, which do not release volatile components and can also be used in a high temperature range.
  • the heat-activatable system should continue. be self-crosslinking after temperature activation in order to withstand a subsequent treatment in the solder bath. Since pure thermoplastics become soft again at high temperatures and thus lose their solder bath resistance, their use is generally forbidden. Thermoplastics would be preferable in themselves, since they can be activated in a few seconds and the connection could accordingly be established quickly.
  • Phenolic resin-based heat-activatable adhesive tapes are generally also excluded, since they release volatile constituents during curing and thus lead to the formation of bubbles.
  • the object of the present invention is therefore to provide a method for bonding plastic parts, in particular FPCBs, which overcomes the disadvantages described above.
  • a heat-activatable adhesive system is to be found for this use, which hardens quickly, is self-crosslinking and solder bath-resistant and has good adhesion to polyimide.
  • the adhesive film used according to the invention can be activated thermally and is particularly suitable and includes for the bonding of FPCBs
  • thermoplastic polymer (i) at least one thermoplastic polymer or a modified rubber and (ii) at least one resin.
  • This reactive film which becomes tacky when exposed to heat, is accordingly a mixture of at least one reactive resin which crosslinks at room temperature and forms a three-dimensional, high-strength polymer network, and at least one permanently elastic see thermoplastics, which counteracts embrittlement of the product.
  • an adhesive film is used that
  • thermoplastic polymer or a modified rubber at least one thermoplastic polymer or a modified rubber and at least one tackifying phenolic resin and / or (iii) at least one epoxy resin.
  • the adhesive film is advantageously composed of the at least one thermoplastic polymer with a mass fraction in the film of 20 to 95% by weight, preferably 30 to 90% by weight, the at least one tackifying phenolic resin with a mass fraction of 5 to 50% by weight .-% and the at least one epoxy resin, which can optionally be mixed with hardeners, optionally also accelerators, with a mass fraction of 0 to 40% by weight, preferably 5 to 30% by weight.
  • thermoplastic polymer can preferably originate from the group of polyolefins, polyesters, polyurethanes or polyamides or can be a modified rubber, for example nitrile rubber.
  • the particularly preferred thermoplastic polyurethanes (TPU) are known as reaction products from polyester or polyether polyols and organic diisocyanates, such as diphenylmethane diisocyanate. They are made up of predominantly linear marrow molecules. Such products are usually commercially available in the form of elastic granules, for example from Bayer AG under the trade name "Desmocoll".
  • thermoplastic polymer in particular TPU
  • selected compatible resins selected compatible resins
  • adhesion there is an increase in adhesion.
  • certain rosins, hydrocarbons or coumarone resins also called coumarone indene resins
  • coumarone resins have proven to be suitable resins.
  • the reduction in the softening temperature of the adhesive film can be achieved by combining the thermoplastic, in particular TPU, with selected epoxy resins based on bisphenol A and / or bisphenol B, to which a latent hardener can be added.
  • An adhesive film from such a system allows the adhesive to be thermally hardened if, for example, an FPCB bonded to the adhesive film according to the invention is passed through a solder bath.
  • the chemical crosslinking reaction of the resins achieves high strengths between the adhesive film and the substrate to be bonded, for example the polyimide film of the FPCB, and a high internal strength of the product is achieved.
  • hardener systems can also be added to the adhesive film. All hardeners known to the person skilled in the art which lead to a reaction with the phenolic resins and / or the epoxy resins can be used here. All formaldehyde donors, for example hexamethylene tetraamine, fall into this category.
  • the viscosity drops briefly, which means that the product can very well wet the surface of the substrate to be bonded, in particular the polyimide.
  • the composition of the adhesive film can be varied within a wide range by changing the type of raw material and the proportions of raw material. Likewise, further product properties such as color, thermal or electrical conductivity can be achieved through the targeted addition of dyes, mineral or organic fillers and / or carbon or metal powders.
  • the adhesive film preferably has a thickness of 5 to 100 ⁇ m, preferably between 10 and 50 ⁇ m.
  • the thermally activatable film comprises (i) an elastic modified rubber, in particular nitrile rubber, with a mass fraction of 20 to 95% by weight, (ii) at least one tackifying phenolic resin with a mass fraction of 5 to 50% by weight and (iii) at least one epoxy resin, to which hardener, optionally also accelerator, can be added, with a mass fraction of 0 to 30% by weight.
  • a solution or a melt of the constituents containing at least one thermoplastic polymer and at least one resin is prepared, the solution or the melt is spread out or poured into a thin layer and subsequently optionally dried.
  • the mass forming the film is preferably coated as a solution or as a melt on a flexible carrier substrate (release film, release paper) and optionally dried, so that the mass can be easily removed from the substrate again.
  • die cuts or rolls of this adhesive film can be glued to the substrate to be bonded (e.g. polyimide) at room temperature or at a slightly elevated temperature.
  • the admixed reactive resins should not yet undergo any chemical reaction at the slightly elevated temperature.
  • the adhesive does not have to be carried out as a one-step process, but for the sake of simplicity, like with a pressure-sensitive adhesive tape, the adhesive film can first be tacked onto one of the two substrates by laminating in the heat.
  • the resin cures in whole or in part and the adhesive joint achieves the high bond strength, far above that of pressure sensitive adhesive systems.
  • the adhesive film is particularly suitable for a hot pressing process at temperatures above 80 ° C., preferably above 100 ° C., particularly preferably above 120 ° C.
  • the adhesive film of this invention has a high elastic component due to the high thermoplastic component, in particular rubber component. Due to the tough elastic behavior caused in this way, the flexible movements of the FPCB's can be compensated particularly well, so that even high loads and peeling movements can be withstood well.
  • Another advantage of the adhesive film over competing systems is the rapid curing caused by the phenolic resins. Optimal curing can be achieved under pressure in less than 30 minutes. Competitor systems take significantly more than 60 minutes to achieve optimal curing. As a result, bonding in industrial processing can be carried out significantly faster.
  • the adhesive film has an advantage over other heat-activated systems due to the high viscoelastic content. Holes are often drilled through the adhesive film for contacting.
  • One problem here is that existing heat-activatable adhesives flow into the holes and thus interfere with the contact. With the inventive use of the adhesive films described above, this problem does not occur at all or only to a greatly reduced extent.
  • FPCBs based on polyimide FPCBs based on polyethylene naphthylate (PEN) and polyethylene terephthalate (PET) can also be bonded. In these cases, too, the adhesive film achieves a high bond strength.
  • PEN polyethylene naphthylate
  • PET polyethylene terephthalate
  • a mixture of 50% by weight of nitrile rubber (Breon®, Zeon), 40% phenolic resin (from Oxychem), 10% phenolic resole resin (lonomer®, from Dyneac Erkner) was made from Methyl ethyl ketone from solution coated on a release paper siliconized with 1.5 g / m 2 and dried at 90 ° C. for 10 minutes at this temperature.
  • the thickness of the adhesive layer was 25 ⁇ m.
  • a mixture of 55% by weight of nitrile rubber (Breon®, Zeon), 35% phenolic resin (from Oxychem), 10% phenolic resole resin (lonomer®, from Dyneac Erkner) was dissolved from methyl ethyl ketone in a solution containing 1, 5 g / m 2 siliconized release paper coated and dried at 90 ° C for 10 minutes at this temperature.
  • the thickness of the adhesive layer was 25 ⁇ m.
  • thermoplastic PU (Desmocoll 400®, Bayer AG), 30% phenolic resin (from Oxychem), 10% epoxy resin (Bisphenol A, Rütapox 0164®, Bakelite AG) and 5% by weight dicyanamide (Dyhard 100 S®, Degussa) was coated from methyl ethyl ketone from solution onto a release paper siliconized with 1.5 g / m 2 and dried at 90 ° C. for 10 minutes at this temperature. The thickness of the adhesive layer was 25 ⁇ m.
  • a commercially available adhesive film namely Pyralux® LF001 from DuPont, with 25 ⁇ m film thickness was used in the comparative tests.
  • Two FPCB's were each bonded with the adhesive films produced according to Examples 1 to 3 and with the reference film (Pyralux® LF001, DuPont).
  • the adhesive film was laminated onto the polyimide film of the FPCB laminate made of polyimide / copper film / polyimide at 100 ° C.
  • This process was then repeated with a second polyimide film from a further FPCB and thus an adhesive joint was produced between two polyimide / copper film / polyimide laminates, the polyimide films in each case being bonded to one another.
  • the composite was heated in a Press made by Bürkle at 170 ° C for 30 minutes at a pressure of 50 N / cm 2 .
  • connections produced in this way had the structure shown in FIG. 1, (a) denoting a polyimide layer, (b) denoting a copper layer and (c) the adhesive film.
  • a composite (a-b-a) of a copper layer (b) with a polyimide layer (a) on both sides represents an FPCB unit.
  • the FPCB composites (FIG.) Bonded by the process described above were completely immersed in a 288 ° C. hot solder bath for 10 seconds. The bond was rated as resistant to the solder bath if no air bubbles were formed which caused the FPCB's polyimide film to inflate. The test was assessed as failed if there was already a slight blistering.
  • Table 1 shows that very high bond strengths were achieved with the adhesive films produced according to Examples 1 to 3 after just 30 minutes of curing. Reference example 1 shows somewhat lower adhesive forces here.
  • Table 3 shows that the adhesive films described in this invention have a significantly higher bond strength compared to the reference example.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Adhesive Tapes (AREA)
  • Laminated Bodies (AREA)

Abstract

L'invention concerne un procédé de collage de pièces en matière plastique, notamment de cartes de circuits imprimés flexibles. Selon l'invention, le collage utilise un film de matière adhésive activable thermiquement et comprenant (i) au moins un polymère thermoplastique ou un caoutchouc modifié et (ii) au moins une résine qui présente, de préférence, au moins une résine phénolique et au moins une résine époxy.
EP03782461A 2003-01-29 2003-12-19 Procede de collage de cartes de circuits imprimes flexibles Withdrawn EP1590416A1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE10303518 2003-01-29
DE10303518 2003-01-29
DE10317403 2003-05-30
DE10317403A DE10317403A1 (de) 2003-01-29 2003-05-30 Verfahren zur Verklebung von FPCB's
PCT/EP2003/014622 WO2004067665A1 (fr) 2003-01-29 2003-12-19 Procede de collage de cartes de circuits imprimes flexibles

Publications (1)

Publication Number Publication Date
EP1590416A1 true EP1590416A1 (fr) 2005-11-02

Family

ID=32826176

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03782461A Withdrawn EP1590416A1 (fr) 2003-01-29 2003-12-19 Procede de collage de cartes de circuits imprimes flexibles

Country Status (6)

Country Link
US (1) US20060088715A1 (fr)
EP (1) EP1590416A1 (fr)
JP (1) JP2007515496A (fr)
KR (1) KR20050094049A (fr)
AU (1) AU2003290101A1 (fr)
WO (1) WO2004067665A1 (fr)

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DE102006055093A1 (de) * 2006-11-21 2008-06-19 Tesa Ag Hitze-aktiviert verklebbares Flächenelement
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WO2004067665A1 (fr) 2004-08-12
US20060088715A1 (en) 2006-04-27
KR20050094049A (ko) 2005-09-26
AU2003290101A1 (en) 2004-08-23
JP2007515496A (ja) 2007-06-14

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