KR101237410B1 - FCCL, manufacturing methode the same and antenna using the FCCL - Google Patents

Abstract

The present invention relates to a two-layer FCCL having excellent insulation and heat resistance, a manufacturing method thereof, and a third generation antenna using the FCCL.
Specifically, the present invention is a thickness 1 consisting of a thermoplastic polyester resin of polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), polycyclohexylene terephthalate (PCT), and polyethylene naphthalate (PEN). A flexible film layer of ˜100 μm; Provided is an FCCL including a Cu pattern layer having a thickness of 1 to 100㎛ laminated on at least one surface of the flexible film layer at high temperature and high pressure or laminated with a PDS (Printing Direct Structure), and a method of manufacturing the same and an antenna using the FCCL.
As a result, FCCL according to the present invention exhibits excellent processability and handleability and high reliability by using a thermoplastic polyester resin such as PET and PEN having excellent heat resistance as the flexible film layer. The advantage is that the pattern can be implemented at a relatively simple process and at low cost.

Description

FCL and manufacturing method thereof and antenna using the FCCL {FCCL, manufacturing methode the same and antenna using the FCCL}

The present invention relates to FCCL (FCCL: Flexible Copper Clad Laminate). More specifically, the present invention relates to a two-layer FCCL having excellent heat resistance, a manufacturing method thereof, and a third generation antenna using the FCCL.

Recently, thanks to the remarkable development of the wireless communication industry, mobile communication antennas have also been evolving.

In general, an antenna is a general term for a device for transmitting and receiving radio waves, and a second generation of 'internal antenna' which is embedded as a separate device inside a mobile communication device through electrical and functional miniaturization from the first generation 'external antenna' protruding to the outside of the mobile communication device. It has evolved into a third generation 'integrated antenna' integrated into the case of the mobile communication device through the 'internal antenna'. The 3rd generation antennas are characterized by more than 30% improvement in performance while simplifying the manufacturing process and enabling miniaturization and thinning of mobile communication devices.

On the other hand, FCCL (Flexible Copper Clad Laminate) is an original or flexible circuit board of a flexible circuit board in which a copper foil pattern is laminated on a polyimide film. It has been regarded as the next generation substrate in the industrial sector.

In particular, the two-layer FCCL of copper foil pattern / polyimide film that directly laminates polyimide film on copper foil pattern instead of the three-layer FCCL of copper foil pattern / adhesive / polyimide film that adhesively bonds polyimide film to copper foil pattern. The two-layer FCCL has attracted much attention in the field of electronic communication devices and displays, which are relatively easy to form fine patterns and have excellent flexibility, and reflect light weight and thinning trends sensitively.

At this time, the polyimide film for FCCL is obtained through a first process for obtaining a polyamide (PAA) as a polymer material containing an imide group in the repeating unit and a second process for obtaining a polyimide from PAA Lose. That is, in the first step, dianhydride is added to a predetermined reaction solution in which diamine is dissolved in organic solvents such as DMAc, DMF, and NMP to obtain PAA. In the second step, PAA is dehydrated and closed. The reaction gives a polyimide. For reference, the second step includes a reprecipitation method using a cosolvent such as water, toluene and ether, a chemical imidization method using a dehydration catalyst, a thermal imidization method using a high temperature, an isocyanate method using diisocyanate, and the like. This is used.

However, polyimide exhibits a disadvantage in that production and handling are very difficult due to poor workability and most of insoluble and insoluble conditions.

The present invention has been made in view of the above circumstances, by using a new material that can replace the existing polyimide to provide a two-layer FCCL and a method for producing the same excellent properties even in a relatively simple process, the object thereof Puts.

Furthermore, an object of the present invention is to provide a third generation antenna that is relatively excellent in terms of processability, integration, and performance using the FCCL.

The present invention, in order to achieve the above object, one of the thermoplastic polyester resin of polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), polycyclohexylene terephthalate (PCT), polyethylene naphthalate (PEN) or A flexible film layer having a thickness of 1 to 100 μm consisting of two or more mixtures; Provided FCCL comprising a Cu pattern layer having a thickness of 1 ~ 100㎛ on at least one surface of the flexible film layer laminated at high temperature and high pressure or printed with a PDS (Printing Direct Structure).

In addition, the present invention (a) PET (polyethylene terephthalate), PBT (polybutylene terephthalate), PTT (polytrimethylene terephthalate), PCT (polycyclohexylene terephthalate), PEN (polyethylene naphthalate) made of thermoplastic polyester resin of one or two or more Preparing a flexible film having a thickness of 1 to 100 μm; (b) preparing a Cu foil having a thickness of 1 to 100 μm; (c) manufacturing a FCCL comprising a step of drying at a speed of 1 to 5 m / min by overlapping the flexible film and the Cu foil between a pair of compression rollers having a temperature of 220 to 280 ° C. and a compression pressure of 5 to 30 Kgf / cm 2. Provide a method.

In addition, the present invention (a) PET (polyethylene terephthalate), PBT (polybutylene terephthalate), PTT (polytrimethylene terephthalate), PCT (polycyclohexylene terephthalate), PEN (polyethylene naphthalate) made of thermoplastic polyester resin of one or two or more Preparing a flexible film having a thickness of 1 to 100 μm; (b) providing a FCCL manufacturing method comprising forming a Cu pattern layer by printing or transferring Cu ink containing copper powder on at least one surface of the flexible film.

At this time, after the step (b), characterized in that it further comprises the step of growing a Cu plating layer on the Cu pattern layer.

In addition, the present invention is a thickness of 1 ~ 1 consisting of a thermoplastic polyester resin of polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), polycyclohexylene terephthalate (PCT), polyethylene naphthalate (PEN) A unit including a 100 μm soft film layer and a Cu pattern layer having a thickness of 1 μm to 100 μm that is laminated on at least one surface of the flexible film layer at high temperature and high pressure or printed with a PDS (Printing Direct Structure) is provided on the inner surface of the case of the mobile communication device. It provides an antenna attached to at least one layer.

FCCL according to the present invention exhibits an excellent processability and handleability and high reliability by using thermoplastic polyester resins such as PET and PEN having excellent heat resistance as the flexible film layer.

In addition, the manufacturing method of the FCCL according to the present invention can realize a fine and various Cu pattern layer in a non-adhesive two-layer structure through a relatively simple process shows a wide applicability.

In addition, the antenna according to the present invention has an advantage in that it is possible to implement a variety of patterns in a relatively simple process and low cost.

1 is a schematic diagram of the FCCL according to the present invention.
Figure 2 is a schematic diagram showing a first FCCL manufacturing method according to the present invention.
Figure 3 is a schematic diagram showing a second FCCL manufacturing method according to the present invention.
Figure 4 is a schematic diagram showing a third FCCL manufacturing method according to the present invention.
5 is a cross-sectional view of an antenna according to the present invention.

EMBODIMENT OF THE INVENTION Hereinafter, one preferable aspect of this invention is looked at with reference to drawings.

1 is a schematic diagram showing an FCCL 10 according to the present invention.

As shown, the FCCL 10 according to the present invention shows a form in which the Cu pattern layer 14 is laminated on at least one surface of the flexible film layer 12 made of a synthetic resin material.

The flexible film layer 12 may include at least one of thermoplastic polyester resins including polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), polycyclohexylene terephthalate (PCT), and polyethylene naphthalate (PEN). Characterized in that the mixing, the Cu pattern layer 14 is characterized in that the Cu foil (Cu foil) laminated at high temperature and high pressure or Cu ink transferred or printed with a PDS (Printing Direct Structure).

Looking at each of them in detail as follows.

The flexible film layer 12 is made of one or two or more of thermoplastic polyester resins including PET, PBT, PTT, PCT, and PEN, preferably dicarboxlylic acdi and aliphatic diols. Among the groups made from), one of the crystalline polymers PET and PEN is used. At this time, if necessary, the flexible film layer 12 of PET or PEN may be subjected to an appropriate orientation crystallization process, and the thickness of the flexible film layer 12 is preferably 1 to 100 μm.

The Cu pattern layer 14 is made of either Cu foil laminated at high temperature and high pressure or Cu ink printed or transferred with PDS. In this case, if necessary, a silane coupling agent may be interposed as a primer for bonding between the flexible film layer 12 and the Cu foil, and a Cu plating layer may be further stacked on the Cu ink. And the whole thickness of the Cu pattern layer 12 containing all these becomes like this. Preferably it is 1-100 micrometers.

Hereinafter, looks at the manufacturing method of the FCCL (10) according to the present invention. For reference, the manufacturing method of the FCCL 10 according to the present invention may have several variations depending on the detailed steps, so that each of them will be described separately, referring to FIG. 1.

<First Manufacturing Method>

FIG. 2 is a schematic view showing a first manufacturing method of the FCCL 10 according to the present invention, in which a Cu foil is laminated on at least one surface of the flexible film layer 12 at high temperature and high pressure to form a Cu pattern layer 14. Yes.

As can be seen, for the first manufacturing method of the FCCL according to the present invention, a synthetic resin film 22 for the flexible film layer 12 and a Cu foil 24 for the Cu pattern layer 14 are prepared. In this case, the synthetic resin film 22 and the Cu foil 24 may be provided in a form wound on a roll, and each material and thickness thereof are substantially the same as the flexible film layer 12 and the Cu pattern layer 14 described above. .

Subsequently, a pair of heatingable compression rollers (R) are heated to 220 to 280 ° C., and the compression pressure is adjusted to 5 to 30 kgf / cm 2, and then the synthetic resin film 22 and the Cu foil 24 are overlapped with the compression rollers R. Pass it through. At this time, if necessary, the surface of the synthetic resin film 22 may be plasma-treated or the silane coupling agent may be properly interposed between the synthetic resin film 22 and the Cu foil 24 before entering the compression roller R. , The passing speed of the compression roller (R) is suitable 1 ~ 5m / min.

Subsequently, drying with a dryer (D) completes the FCCL 10 according to the invention. At this time, if necessary, FCCL 10 according to the present invention can be stored in the form of a roll, the entire process can be carried out in a reel to reel method.

<Second manufacturing method>

3 is a schematic view showing a second manufacturing method of the FCCL 10 according to the present invention, wherein the Cu ink 32 is transferred to at least one surface of the flexible film layer 12 by the PDS method to form the Cu pattern layer 14. This is the case.

As can be seen, for the second method of manufacturing the FCCL 10 according to the present invention, the flexible film layer 12 is first prepared.

Subsequently, a separate substrate S having an engraved shape of a desired Cu pattern layer 14 is engraved therein to fill the intaglio pattern with Cu ink 32, and a pad P having a ball or roll shape having elasticity is formed. And transfers the Cu ink 32 filled in the intaglio pattern to the flexible film layer 12. In this case, the Cu ink 32 may be in a liquid or paste state in which Cu fine powder and a binder are appropriately contained in an organic solvent such as a solvent, and a Cu powder may be a dendrite phase for preventing oxidation.

Subsequently, drying with a dryer (not shown) completes the FCCL 10 according to the present invention.

Preferably, the plating process is further performed to prevent the falling off of the Cu powder and to obtain a more dense structure of the Cu pattern layer 12.

The plating process for this is, for example, by using a copper as an anode and a Cu pattern layer 14 of the FCCL (10) according to the present invention as a cathode immersed in a wet plating bath containing a plating solution such as copper sulfate aqueous solution (Cu pattern layer ( 14) A wet electroplating method of depositing a Cu plating layer on top may be used.

<Third manufacturing method>

4 is a schematic diagram showing a third manufacturing method of the FCCL 10 according to the present invention, in which the Cu ink 32 is printed on at least one surface of the flexible film layer 12 to form the Cu pattern layer 14. Yes.

As can be seen, for the third method of manufacturing the FCCL 10 according to the present invention, after preparing the flexible film layer 12, Cu ink 32 is printed on the flexible film layer 12 using an industrial inkjet printer (H). do. And drying with a dryer to complete the FCCL (10) according to the present invention. In addition, it is preferable that the plating process may be further performed. For the drawing step therefor, a wet electroplating method may be used.

Hereinafter, look at the heat resistance of the FCCL according to an embodiment of the present invention.

FCCL (10) according to an embodiment of the present invention passes the Cu foil having a thickness of 35㎛ to the PET flexible film layer 12 having a thickness of 25㎛ 250 ℃, 20Kgf / ㎠ compression roller at a speed of 2.5m / min After drying, the Cu pattern layer 14 was embodied as a two-layer FCCL cut to 183 mm in width and 180 mm in length (hereinafter referred to as a first specimen). The first and second specimens were placed in a hot air circulating dryer (Jongno Instrument Industry, model name JFC-301) and then 30 and 60 at 250 and 260 ° C, respectively. After 90 seconds, the state change was observed.

Table 1 summarizes the observation results.

Based on the above results, it can be seen that the FCCL 10 according to the present invention has not changed at least at high temperature of 260 ° C. for more than 90 seconds, and thus maintains high heat resistance at all times in a normal use environment. Furthermore, considering that the heat resistance of PEN is generally higher than PET, the FCCL 10 according to the present invention is inferior in heat resistance as compared to the existing FCCL of the polyimide base.

On the other hand, Figure 5 is a cross-sectional view showing an antenna 40 using the FCCL (10) in accordance with the present invention.

As shown, the antenna 40 according to the present invention is a third generation antenna integrated in the case C of the mobile communication device, and is formed on at least one surface of the flexible film layer 12 made of thermoplastic polyester resin such as PET and PEN. At least one layer on which the Cu pattern layer 14 is laminated, printed or transferred is attached to the case C of the mobile communication device.

At this time, the Cu pattern layer 14 of each layer is preferably connected to each other through a hole or the like, thereby serving as an antenna for transmitting and receiving radio waves.

The above description and drawings are only illustrative of the invention and do not limit the technical spirit of the invention. That is, the present invention may be variously modified, but all these modifications should fall within the scope of the present invention if they are within the technical spirit of the present invention. The scope of the present invention is defined by the following claims or the equivalents thereto. Is determined.

Claims (5)

delete (a) 1 to 100 thicknesses consisting of thermoplastic polyester resins of polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), polycyclohexylene terephthalate (PCT), and polyethylene naphthalate (PEN) Preparing a flexible film of μm;
(b) preparing a Cu foil having a thickness of 1 to 100 μm; And
(c) manufacturing a FCCL comprising a step of drying at a speed of 1 to 5 m / min by overlapping the flexible film and the Cu foil between a pair of compression rollers having a temperature of 220 to 280 ° C. and a compression pressure of 5 to 30 Kgf / cm 2. Way.
(a) 1 to 100 thicknesses consisting of thermoplastic polyester resins of polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polytrimethylene terephthalate (PTT), polycyclohexylene terephthalate (PCT), and polyethylene naphthalate (PEN) Preparing a flexible film of μm;
(b) printing or transferring Cu ink containing Cu powder on at least one surface of the flexible film to form a Cu pattern layer; And
(c) depositing a Cu plating layer on the Cu pattern layer through wet electroplating. delete delete

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