JP2006021817A - Electronic component wrapper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic component wrapper which has an antistatic function even at the time of peeling off a cover tape. <P>SOLUTION: The electronic component wrapper is formed of a carrier tape having a recess for storing a component therein, and the cover tape bonded to a surface of the carrier tape, in which the recess of the carrier tape is formed, so as to cover the recess. Herein the carrier tape and the cover tape have heat seal surfaces which are arranged so as to be opposed to each other, and the heat seal surface of each of the carrier tape and the cover tape has a conductive layer containing a conductive material similar in chemical composition to its counterpart, or has a conductive layer containing a conductive material and a binder similar in chemical composition to their counterparts. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an embossed carrier tape package used for storage, transportation, and mounting of semiconductor parts (hereinafter referred to as electronic parts) such as IC and LSI.

When the electronic component is used for storage, transfer, mounting, etc., a carrier tape package of a carrier tape and a cover tape is usually used. The carrier tape is formed by embossing a lot of pockets (embossed parts) in the longitudinal direction of the plastic tape. Electronic parts are stored in the pockets, sealed with a cover tape, capped, and the carrier tape. It is a tape package. In the mounting process, the cover tape is peeled off from the carrier tape package and used for an automatic mounting apparatus.
In general, a sheet (tape) made of plastic has poor conductivity and tends to be charged with static electricity on its surface. Therefore, in order to prevent various troubles caused by static electricity, such as adhesion of dust accompanying the generation of static electricity, or damage or destruction of stored items, that is, electronic components, it has been given conductive performance. ing.
Usually, as a means for imparting conductive performance, a method is adopted in which a conductive material is used to make the surface of the plastic sheet or the entire sheet conductive, thereby speeding up leakage of surface charges.
Also, the sealant surface of the cover tape may be subjected to a conductive treatment based on the same idea.

  In the beginning, either carrier tape or cover tape was subjected to conductive treatment, but recently, both carrier tape and cover tape, and also to the sealant surface of the cover tape have been subjected to conductive treatment ( Patent Document 1). As shown in Patent Document 1, the heat sealant layer of the cover tape is a layer in which conductive fine powder mainly composed of barium sulfate particles coated with antimony-doped tin oxide is dispersed in a thermoplastic resin. The carrier tape is produced by molding a sheet made of a polycarbonate resin containing conductive carbon fine particles.

As shown in Patent Document 1, in the conventional electronic component package, the antistatic treatment (conductivity imparting treatment) of the carrier tape and the cover tape used for the carrier tape is performed with different formulations (different materials). I came.
With the recent progress of miniaturization, high integration, and high density of electronic components, the required performance for avoiding electrification of electronic component packages has become increasingly severe. And in the case where the carrier tape and the cover tape have different antistatic measures as in the prior art, the antistatic performance is satisfied when the electronic component package is transferred, but the carrier tape At the stage of peeling the cover tape from the case, it has become a problem that a case where the antistatic performance is not satisfied has started to occur, and a solution to this is strongly demanded.

The performance required for the electronic component package is not limited to antistatic performance, and several types are added.
As a method for imparting conductivity to the carrier tape / cover tape, there are a method of applying a conductive substance (conductive filler) to the surface of the plastic sheet and a method of kneading the conductive substance inside the plastic.
When the conductive material is applied to the surface of the plastic sheet, the applied conductive material is removed from the binder by vibration of the electronic component package or sliding between the electronic component package and the stored product. Is known to have a greater tendency to flake off and contaminate the stored items. There is also a problem of outgassing from conductive materials.

When the method of imparting conductivity to the carrier tape / cover tape is a method of kneading a conductive substance into the plastic, peeling of the conductive substance and outgassing are considerably reduced, but they are not necessarily complete. There is.
In the old days, carbon black, graphite, metal powder, metal fiber, etc. have been used as conductive materials, but these are opaque, so when applied or kneaded, they are carrier tapes and cover tapes. Becomes opaque, and it becomes difficult to visually recognize the articles to be stored from the outside of the electronic component package. When it is necessary to visually recognize the item to be stored from the outside of the electronic component package, a transparent inorganic conductive material as disclosed in Patent Document 1 is used for the antistatic treatment of at least one of the carrier tape and the cover tape. In some cases, conductive materials or conductive polymer compounds as shown in Patent Documents 2 and 3 are used (see Patent Documents 2 and 3).

In Patent Document 2, as a conductive polymer compound, polyaniline or polyaniline copolymer doped with protonic acid, sulfonated polyaniline, sulfonated polyaniline mainly composed of aminoanisolesulfonic acid, and the like are disclosed. Polypyrrole, which is a π-electron conjugated polymer, is shown respectively.
As another antistatic treatment, both the surface of the cover tape facing the electronic component faces the surface of the electronic component facing the cover tape, and both the resin that is easily charged on the positive side of the charging column and the resin that is easily charged on the negative side. There is also an example of containing (see Patent Document 4).
Patent Document 2 shows a packaging film for carrier tapes, trays, magazines, IC / LSI packages, etc. Patent Document 3 shows a vacuum forming conductive sheet, more specifically an electronic component. Although the thing shown by patent document 4 as a storage container (tray) of this is shown that it can each be used as a cover tape, nothing is mentioned regarding the combination of a carrier tape and a cover tape.

  In the case of conventional electronic component packaging, even if it is necessary to make the stored item visible from the outside, it is sufficient if the inside can be seen from either the carrier tape side (from the bottom) or the cover tape side (from the top). However, due to the recent trend toward higher integration and multilayering of electronic components, there has been a demand for making it visible from both sides of the carrier tape side (from the bottom) and the cover tape side (from the top). Yes. An electronic component package meeting such a demand has not yet been found in the market.

JP-A-8-295001 Japanese Patent Laid-Open No. 10-278160 JP 2000-280335 A JP 2003-128132 A

The problems to be solved by the present invention are as follows. Firstly, in the electronic component packaging body in which the cover tape is joined to the carrier tape, an electronic device having an antistatic function even when the cover tape is peeled off. It is to provide a parts package.
Secondly, in an electronic component packaging body in which a cover tape is bonded to a carrier tape, an electronic component packaging body to which performance of allowing a stored product to be visually recognized from both sides of the carrier tape and the cover tape is added is provided. is there.
The third object is to provide an electronic component package to which a performance that makes it difficult for a conductive substance to peel off is further added.
The fourth object is to provide an electronic component package using a more preferable conductive polymer material as the conductive material.
Other additional problems will become apparent from the claims and the description of the specification.

  The electronic component package of the present invention is an electronic component package comprising a carrier tape having a recess for housing a component and a cover tape bonded to a surface of the carrier tape where the recess is formed so as to cover the recess. The carrier tape and the cover tape having opposite heat seal surfaces have a conductive layer made of the same type of conductive material or a conductive layer made of the same type of conductive material and the same type of binder. . The conductive substance is either a quaternary ammonium salt, a π-electron conjugated polymer, or a combination thereof, or the conductive substance is a π-electron conjugated polymer and serves as a binder. It is preferable that the conductive layer is formed together with the thermoplastic resin.

The π-electron conjugated polymer is polythiophene, polypyrrole, polyaniline or a derivative thereof, and the thermoplastic resin serving as the binder is a polyester resin, polyurethane resin, acrylic resin, acrylic urethane resin, or vinyl chloride-vinyl acetate. Any one of a polymerization resin and an ethylene-acrylic acid copolymer resin or a combination thereof, and a surface resistance value of the conductive layer may be 1 × 10 ⁴ Ω or more and less than 1 × 10 ¹³ Ω.
The total light transmittance of the carrier tape and the cover tape is preferably 70% or more and haze 30% or less.

  According to the first aspect of the present invention, not only the antistatic function during storage / transfer, but also the charging is extremely reduced when the cover tape is peeled from the electronic component package. According to the second aspect of the invention, in addition to this, it is possible to visually recognize the stored item (automatic pattern recognition by a machine) from either side of the carrier tape or the cover tape. According to the invention which concerns on Claim 3, in addition to them, there is no peeling and contamination of the electroconductive substance used for the carrier tape and the cover tape. According to the invention which concerns on Claims 4-8, a more preferable electronic component package is obtained.

The present invention provides an electronic component package in which both the carrier tape and the cover tape have the same antistatic treatment, so that the cover tape is peeled off not only during storage and transfer but also during mounting. Is based on the new knowledge that charging can be prevented.
Hereinafter, the present invention will be described in detail.
The base material of the carrier tape that constitutes the electronic component package of the present invention may be any of those usually used, such as polystyrene (PS), amorphous polyethylene terephthalate (A-PET), vinyl chloride (PVC), polycarbonate (PC). ), ABS resin and the like are preferable. The thickness can also be appropriate, and can usually be, for example, about 100 to 500 μm.

The same applies to the material of the base material of the cover tape. It may be the same as or different from the carrier tape substrate. The thickness can also be set appropriately, and is usually about 30 to 100 μm, for example.
As the treatment for imparting conductivity, either a conductive substance is directly applied to the base sheet, mixed with a binder resin, coated and dried, or kneaded when preparing the base sheet. Is possible. The direct application method is simple, but the conductive material is easily peeled off. The most common method of coating by mixing with a binder resin. The method of kneading at the time of preparing the base sheet is the safest against the peeling of the conductive material and the generation and release of gas, but a commercially available sheet or the like cannot be used and needs to be manufactured by itself.

The present invention is characterized in that the opposite heat seal surfaces of the carrier tape and the cover tape have a conductive layer made of the same type of conductive material or the same type of conductive material and the same type of binder. In the present invention, the same type of conductive material means the same conductive material or a derivative thereof, and the same type of binder means the same resin or the same kind of resin.
Although not necessarily essential, the other surface may be subjected to antistatic treatment. In this case, it is possible not only to prevent static charge due to friction between the carrier tape / cover tape and the stored item, but also due to static charge based on friction between the electronic component package and the external object. Can also prevent.

  There is no special restriction | limiting as an electroconductive substance used in this invention. Opaque conductive materials such as carbon black, graphite, metal powder, metal fiber, zinc antimonate, and barium sulfate coated with antimony-doped tin oxide may be used for visual recognition of the interior of electronic component packaging. If necessary, transparent inorganic / organic conductive materials such as tin oxide and quaternary ammonium salts, and π-electron conjugated polymers, among them, polythiophene, polypyrrole, polyaniline or their derivatives Etc.

The binder resin used when the conductive material is mixed with the binder resin and applied to the base sheet may be any thermoplastic resin that has adhesiveness to the base sheet and has recess moldability and heat sealability. Examples thereof include polyester resin, polyurethane resin, acrylic resin, acrylic urethane resin, vinyl chloride-vinyl acetate copolymer resin, and ethylene-acrylic acid copolymer resin, and combinations thereof are also possible. In particular, when transparency is desired, it is preferable to use a polyester resin, an acrylic resin, or a polyurethane resin.
The surface resistance value of the conductive layer needs to be able to quickly leak the surface charge when static electricity is generated, and is preferably 1 × 10 ⁴ Ω or more and less than 1 × 10 ¹³ Ω, more preferably 1 × 10 ^4. Ω or more and less than 1 × 10 ¹¹ Ω.

  It is preferable that the stored items stored in the electronic component package are visible from the outside. The visibility from the outside may be sufficient for human eyes even if the transparency is insufficient to some extent, but when using OCR technology to automatically check the stored items by image, It is desirable that the light transmittance is 70% or more and the haze (cloudiness value) defined by (scattered light transmittance / total light transmittance) × 100 is 30% or less.

Below, the Example and comparative example of this invention are shown.
[Manufacture of carrier tape]
In the following manner, the carrier tape No. 1-6 were manufactured.
No. 1 = 0.30 mm thick polystyrene sheet (trade name: “Clearen” manufactured by Electrochemical Co., Ltd.) Polyaniline-based water-soluble conductive polymer (trade name, manufactured by Mitsubishi Rayon Co., Ltd.) which is a π-conjugated conductive polymer "Apu PASS") acrylic emulsion solution (Mitsubishi Rayon Co., Ltd., trade name: "MX-7000", solid content 10%) is wet coated with a gravure coater to dry 20μm (dry film thickness 2μm) A functional resin sheet was obtained.

No. 2 = 0.30 mm thick A-PET sheet (trade name: “Novaclear” manufactured by Mitsubishi Chemical Corporation), polypyrrole colloidal solution (trade name, manufactured by Maruhishi Oil Chemical Co., Ltd.) as a π-conjugated conductive polymer : "PPY-12") and polyurethane emulsion (Daiichi Kogyo Seiyaku Co., Ltd., trade name: "F-8582D") dispersed at a ratio of 4:10, wet coated with a gravure coater to a thickness of 20 μm. It was dried by work (dry film thickness 2 μm) to obtain a conductive resin sheet.
No. 3 = 0.20 mm thick polycarbonate (trade name: “# 8010” manufactured by GE Plastics), polythiophene derivative (trade name: “Baytron P” manufactured by Bayer Co., Ltd.) as a π-conjugated conductive polymer, and acrylic emulsion (Mitsubishi) Rayon Co., Ltd. trade name: “LX-301”) is dispersed in a ratio of 5:10 by wet coating with a gravure coater, 20 μm (dry film thickness 2 μm), conductive resin sheet Got.

No. 4 = 0.30 mm thick vinyl chloride sheet (trade name: “” manufactured by Shin-Etsu Polymer Co., Ltd.) and monoalkyltrimethylammonium chloride (product name: “Arcard 16-29” manufactured by Lion Akzo Co., Ltd.) as a quaternary ammonium salt. )) And polyurethane emulsion (Daiichi Kogyo Seiyaku Co., Ltd., trade name: “F-8582D”) in a ratio of 3:10 was dispersed in a gravure coater in the same manner as in Example 1 to 20 μm. The coating was dried (dry film thickness 2 μm) to obtain a conductive resin sheet.
No. 5 = 0.30 mm thick A-PET sheet (trade name: “Novaclear” manufactured by Mitsubishi Chemical Corporation) and methanol-dispersed zinc antimonate sol (trade name manufactured by Nissan Chemical Industries, Ltd .: “CELNAX CX-Z401M-”) F ”) (solid content 40%) and polyurethane emulsion (Daiichi Kogyo Seiyaku Co., Ltd., trade name:“ F-8582D ”) dispersed at a ratio of 4.5: 10 using a gravure coater A 20 μm wet coating was applied (dry film thickness 2 μm) to obtain a conductive resin sheet.

No. 6 = 0.20mm thick polycarbonate (GE plastic product name: “# 8010”) with an acrylic carbon paint (trade name “D-4256”, manufactured by Shinto Chemitron Co., Ltd.) using urethane-modified acrylic as a solvent. The coating resin was wet coated with a coater and dried to 10 μm (dry film thickness 2 μm) to obtain a conductive resin sheet.
These conductive resin sheets were slit and then molded to obtain a conductive carrier tape.
The evaluation results of the conductive carrier tape are shown in Table 1.

The evaluation method is as follows.
-Adhesiveness: The adhesiveness between the base material and the coating film was tested in accordance with JIS K-5600-1 and peeled off. ○.
Cover tape peel strength: The case where the peel strength when peeled 180 degrees at a peel rate of 300 mm / min was in the range of 0.1N to 1N was rated as ◯, and the other was marked as x.
-Total light transmittance, haze (JIS K 7136): Measurement uses TM double beam haze computer HZ-2 (trade name, manufactured by Suga Test Instruments Co., Ltd.), and measurement conditions are temperature: 23 C., humidity: 50% RH.
Surface resistance value: A high resistance meter (trade name: “TR-3”) manufactured by Tokyo Electronics Co., Ltd. was used for measurement.

[Manufacture of cover tape]
In the following procedure, cover tape No. A to F were produced.
In each case, a 50 μm-thick PET sheet (single-side antistatic treatment product) (trade name: “Lumirror” manufactured by Toray Industries, Inc.) is used as a base sheet, and the surface opposite to the surface subjected to antistatic treatment is as follows. The coating liquid shown was wet coated with a gravure coater to a thickness of 10 μm and dried to obtain a conductive cover tape. The dry film thickness is shown for each.
No. A = π-conjugated conductive polymer polyaniline water-soluble conductive polymer (trade name: “apua PASS” manufactured by Mitsubishi Rayon Co., Ltd.) acrylic emulsion solution (trade name: manufactured by Mitsubishi Rayon Co., Ltd .: “MX-” 7000 ", 10% solids). The dry film thickness was 2 μm.

No. B = π-conjugated conductive polymer, polypyrrole colloid solution (trade name: “PPY-12”, manufactured by Maruhishi Oil Chemical Co., Ltd.) and polyurethane emulsion (trade name, manufactured by Daiichi Kogyo Seiyaku Co., Ltd .: “F- 8582D ") in a ratio of 4:10. The dry film thickness was 2 μm.
No. C = π conjugated conductive polymer: polythiophene derivative (trade name “Baytron P” manufactured by Bayer Co., Ltd.) and acrylic emulsion (trade name “LX-301” manufactured by Mitsubishi Rayon Co., Ltd.) 5:10 Coating liquid dispersed in the ratio of The dry film thickness was 2 μm.

No. D = monoalkyltrimethylammonium chloride (trade name: “ARCARD 16-29” manufactured by Lion Akzo Co., Ltd.) as a quaternary ammonium salt and polyurethane emulsion (trade name: “F-8582D” manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) ) In a ratio of 3:10 and a ratio of 3:10. The dry film thickness was 2 μm.
No. E = methanol-dispersed zinc antimonate sol (trade name, manufactured by Nissan Chemical Industries, Ltd .: “SELNAX CX-Z401M-F”, solid content 40%) and polyurethane emulsion (trade name, manufactured by Daiichi Kogyo Seiyaku Co., Ltd .: “ F-8582D ") in a ratio of 4.5: 10. The dry film thickness was 2 μm.

No. F = acrylic carbon paint using urethane-modified acrylic as a solvent (trade name “D-4256” manufactured by Shinto Chemitron Co., Ltd.). The dry film thickness was 2 μm.
Table 2 shows the evaluation results of these conductive cover tapes.

  The carrier tape and the cover tape were combined to evaluate peeling charge. The evaluation results are shown in Table 3.

The stripping voltage was measured according to the combinations shown in Table 3, taped under the following conditions, stripped at a speed of 300 mm / min, and the distance between the cover tape and the measuring instrument was 5 mm.
Taping conditions Taping device: “VN1100” manufactured by Vanguard Systems Inc.
Sealing temperature: 160 ° C
Seal pressure: 3 kgf / cm ² (about 294.1995 kPa)
Sealing time: 0.4 seconds (double stamp)
Measuring instrument: Surface potential meter (“MODEL 344” manufactured by Trek Japan Co., Ltd.).

  According to Table 3, although there was no problem in terms of peel strength, a clear difference was confirmed between the peel withstand voltage of Example 30V or lower and the conventional example of 40V or higher. Incidentally, the standard of an electrical component manufacturer when used in an IC or the like that is easily damaged by static electricity is 50 V or less, and the package of the present invention sufficiently satisfies this.

  According to the present invention, in the electronic component package, not only during storage / transfer, but also when the cover tape is peeled off from the carrier tape, it is possible to prevent electrification. In the field of transportation and mounting, there is no inconvenience or damage to electronic parts, and there is a great advantage in this technical field.

Claims (7)

  An electronic component package comprising a carrier tape having a recess for housing a component and a cover tape bonded to a surface of the carrier tape where the recess is formed so as to cover the recess, the carrier tape and the cover tape An electronic component package comprising: a conductive layer made of a conductive material of the same system or a conductive layer made of a conductive material of the same system and a binder of the same system.   The electronic component package according to claim 1, wherein the conductive substance is a quaternary ammonium salt, a π-electron conjugated polymer, or a combination thereof.   The said electronic component package body was formed from the resin sheet and / or resin film which have a conductive layer which consists of a pi-electron conjugated polymer and the thermoplastic resin used as a binder. Electronic parts packaging.   The electronic component package according to claim 2, wherein the π-electron conjugated polymer is polythiophene, polypyrrole, polyaniline, or a derivative thereof.   The thermoplastic resin as the binder is made of any one of polyester resin, polyurethane resin, acrylic resin, acrylic urethane resin, vinyl chloride-vinyl acetate copolymer resin, ethylene-acrylic acid copolymer resin, or a combination thereof. Item 5. An electronic component package according to any one of Items 3 and 4. The electronic component package according to claim 1, wherein the conductive layer has a surface resistance value of 1 × 10 ⁴ Ω or more and less than 1 × 10 ¹³ Ω.   The electronic component package according to any one of claims 1 to 6, wherein the total light transmittance of the carrier tape and the cover tape is 70% or more and haze 30% or less.