JP2014227216A - Conductive carrier tape - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a conductive carrier tape: where the occurrence of failures due to triboelectric charging and peeling electrostatic charging at the peeling of a cover tape is aborted, effectively suppressed and prevented as a paper mount electronic component carrier tape for storing an ultramicro chip type electronic component; and whose mount formability and productivity are excellent.SOLUTION: In a conductive carrier tape for storing an ultramicro chip type electronic component having an AB size of 0.40 mm×0.20 mm or less: a mount is made of paper; a conductive paint is coated on at least an ultramicro chip type electronic component-storing surface on the paper mount or both surfaces; and a coated surface has a surface resistance value of 1.0×10Ω or more and less than 1.0×10Ω.

Description

  The present invention relates to a conductive carrier tape.

  In the electronic industry, which has made remarkable progress in recent years, especially in mobile devices such as smartphones and tablets for mobile phones, there is a demand for ultra-miniaturization and low profile to enable high-density mounting of electronic components. It is increasing. Following the 0402 size already on the market, the 0201-03015 size is soon at a stage where sample shipments can be expected. With regard to the miniaturization and weight reduction of parts due to such a tendency, problems that cannot be considered in the case of conventional parts are pointed out in each scene.

  In particular, problems have been pointed out, such as mounter mistakes that cause parts to adhere to the cover tape when the cover tape is peeled off due to static electricity in the mounter process that is mounted on the board, and especially due to frictional charging during the winter dry season. Yes.

  Conventionally, various attempts have been made for measures for preventing such charging in electronic component storage carrier tapes for mounter processes. For example, coating the surface with a conductive agent such as carbon black or pasting conductive paper (Patent Document 1), adding a conductive material to the carrier tape mount, and coating the surface with a conductive material (Patent Document 2) has been proposed.

In addition, a tape mount itself is constituted by a resin having a specific composition, an antistatic agent, and a heat seal agent (Patent Document 3), and the cover tape is formed in a multilayer structure with a resin composition containing carbon nanofibers. (Patent Document 4) Furthermore, in order to prevent troubles caused by static electricity when peeling the cover tape from the paper mount, the back surface on the side opposite to the surface to which the top tape is bonded is filled with chips. Attempts have also been made to provide a conductive layer of particles, metal film, conductive polymer or the like so that the surface electrical resistance value on the back surface is 1.0 × 10 ⁷ Ω or less (Patent Document 5).

  As a process in which such a device is tried, specifically, in accordance with the progress toward the miniaturization of electronic parts, for example, in the electronic parts of 0402 size, the common name is W4P1 (the product width is 4 mm and the pitch is Tap the parts on an embossed carrier tape made of conductive resin called 1mm) or use a conductive cover tape for the press type of paper carrier called W8P2 to W8P1 (product width is 8mm and pitch is 2mm to 1mm) The way to do it is taken.

  In taping of such micro parts, W4P1 is very difficult to handle due to its precision, and it is impossible to lengthen the base material cover tape (2.6 mm width), so it is efficient and low cost. It is not always easy to deal with, and market expansion has been stagnant. Further, since taping on the conventional W8P2 press carrier mount uses a conductive cover tape, the cost of the taping material per component is more expensive than W4P1, which requires more advanced technology. The transition to W8P1 has become a reality. However, due to the characteristics peculiar to paper, mounter mistakes due to dust generation of the mount itself, generation of triboelectric charging, fluff removal when the cover tape is peeled, etc., cause reduction in mounter efficiency and obstruction of cleanliness.

  Further, it is not always easy to improve the formability of pockets and the like due to the paper mount.

  Even with the conventional contrivance for paper mount as in, for example, Patent Document 5, the problem with the paper mount carrier tape corresponding to the miniaturization of electronic components has not been solved.

Japanese Patent Laid-Open No. 9-188385 JP 2000-203521 A JP 2008-230651 A JP 2007-308158 A JP 2008-297909 A

  From the background as described above, the present invention is a paper mount electronic component carrier tape for dealing with ultra-miniaturization of electronic components. Therefore, it is an object of the present invention to provide a new conductive carrier tape that can be effectively suppressed and prevented, and can be improved in mount formability and productivity.

The conductive carrier tape of the present invention is an electronic component storage conductive carrier tape for storing an ultra-fine chip type electronic component having an AB size of 0.40 mm × 0.20 mm or less. At least the electronic component storage surface or both surfaces of the paper mount are coated with conductive paint, and the surface resistance value of the coated surface is 1.0 × 10 ⁴ Ω or more and less than 1.0 × 10 ¹¹ Ω. It is characterized by being.

  In the conductive carrier tape of the present invention, the conductive layer formed on the coated surface has a conductive agent of 0.5 to 30 parts by weight, a resin component of 40 to 70 parts by weight, and an additive of 30 to 60 parts by weight per 100 parts by weight. Part.

  In addition, the conductive layer formed on the coated surface contains one or more carbon nanoconductive agents among multi-walled carbon nanotubes, single-walled carbon nanotubes, fullerenes, and carbon nanohorns as a conductive agent. The conductive layer formed on the work surface preferably contains one or more conductive polymers such as polyaniline and polythiophene as a conductive agent.

The paper mount preferably has a water absorption rate in the range of 3 to 7%, and the paper mount preferably has a cup size performance of the base paper in the range of 26 to 30 g / m ² .

  The conductive paint is preferably an emulsion-type aqueous paint containing a conductive agent, a resin component, and an additive, or a solvent-based paint using an organic solvent.

  Moreover, it is preferable that the application of such a conductive paint is a gravure coating.

  According to the conductive carrier tape for storing the ultrafine chip type electronic component of the present invention, it is not possible in the prior art by taking advantage of the feature that it is a paper mount.

  As a paper mount electronic component carrier tape, the occurrence of problems due to triboelectric charging and peeling charging at the time of peeling off the cover tape is effectively suppressed and prevented, and the mountability and productivity are also improved.

As described above, the conductive carrier tape for storing electronic components for storing ultra-small chip-type electronic components having an AB size of 0.40 mm × 0.20 mm or less according to the present invention uses paper as a mount, At least the conductive surface of the electronic component is coated with a conductive paint, and the surface resistance value of the coated surface is 1.0 × 10 ⁴ Ω or more and less than 1.0 × 10 ¹¹ Ω.

  That is, the following requirements are essential in the conductive carrier tape of the present invention.

  1) Paper mount.

  2) A conductive paint is applied on at least the electronic component storage surface of the paper mount, that is, the front surface of the carrier tape.

3) The surface resistance value of the coated surface, that is, the conductive layer formed by applying the conductive paint, is 1.0 × 10 ⁴ Ω or more and less than 1.0 × 10 ¹¹ Ω.

  If any of these requirements is lacking, it is not practically preferable in terms of performance and characteristics as a conductive carrier tape for storing an ultra-fine chip type electronic component as described above.

  As described above, a conductive coating is applied to the paper board to form a conductive layer. For this conductive layer, 0.5 to 30 parts by mass of a conductive agent, 30 to 30 parts by weight of resin agent per 100 parts by mass of the conductive layer. Generally considered to be in the range of 80 parts by weight and 10-50 parts by weight of additive. More preferably, the resin component is in the range of 40 to 70 parts by mass and the additive is 30 to 60 parts by mass.

  And although various conductive agents may be included in the conductive layer, preferably one or more carbon nanoconductive agents of multi-walled carbon nanotubes, single-walled carbon nanotubes, fullerenes, carbon nanohorns, One or more kinds of conductive polymers including polyaniline and polythiophene are considered.

  Metals and fine particles of these inorganic oxides are not necessarily preferred for the carrier tape for storing ultra-fine chip electronic components of the present invention. However, depending on the type and particle size, it may be considered to be used in combination.

  The conductive layer is formed by applying a conductive paint. In this case, the conductive paint contains the conductive agent, the resin component, and the additive as described above.

  In the conductive paint of the present invention, an emulsion is considered in consideration of dispersing and containing the above-mentioned conductive agent, coating efficiency and cost, productivity, post-coating post-processing, and using a paper mount. It is preferably considered to be used as a water-based paint composition of the mold. For example, from the viewpoint of affinity with paper board, resins such as polyvinyl alcohol and polyester are preferred as the resin component. In addition to these, examples of resins that may be used in combination with these include acrylic resins and urethane resins. In the case of using the carbon nanoconductive agent, a dispersion treatment by applying ultrasonic waves together with water and a resin component is considered. Note that the conductive paint may be a solvent-based paint using an organic solvent.

  As for the additive, it is considered that a wax such as polyethylene wax, stearic acid, or the like is blended from the viewpoint of peelability when the cover is peeled from the conductive layer. In addition to this, various additives such as fluorine wax, carnauba wax, and paraffin wax may be considered as additives.

  And various methods may be employ | adopted about the coating to an electroconductive paper board, For example, a gravure process is employ | adopted suitably.

  In the present invention, it is preferable to preliminarily treat the paper board in a paper making process or the like using a surface sizing agent. This is to maintain the paper board surface acceptability of the conductive paint. Such a surface sizing agent can be selected including a commercially available product, and those mainly composed of a styrene acrylate-based polymer blended with water or alcohol such as isopropyl alcohol can be used.

  As an example of the case where a polyester resin is used as the resin component of the conductive paint, when the PVA concentration as the PVA aqueous composition is 1 to 5%, the surface sizing agent has a ratio of about 0.2 to 2%. It is preferably considered to be.

  Accordingly, it is desirable that the water absorption rate of the paper is determined from the viewpoint of controlling the paper mass to 3 to 7%, more preferably 5 to 6% based on the paper mass.

  If the water absorption is less than 3%, the coating film is insufficiently formed. On the other hand, if it exceeds 7%, it is an excessive coating film, which is not good.

In the conductive carrier tape of the present invention, it is considered that the paper mount has a cup size performance of the base paper in the range of 22 to 35 g / m ^2, more preferably 26 to 30 g / m ² .

22 g / ^m in excess coating is less than ^2, whereas for the more than 35 g / ^{m 2} is insufficient film forming, not good.

  As for the coating for maintaining the surface acceptability of the conductive paint, a calendar method is desirable in the present invention. The size press processing method that requires pressurization is expensive in terms of equipment and cost, but such a problem does not occur in the present invention.

  In the configuration of the conductive carrier tape of the present invention, the following ranges are usually considered for the thickness of the paper mount and the conductive layer.

Paper mount: 0.15 to 1.20mm
Conductive layer: 0.1 to 5 μm only on the front side
Both sides, 0.2-10μm
In such a range, in the present invention, the coated surface, that is, the surface resistance of the conductive layer is set to be 1.0 × 10 ⁴ Ω or more and less than 1.0 × 10 ¹¹ Ω.

  Here, the surface resistance value depends on JIS6911 and is a measured value at a temperature of 20 ° C.

  The operation conditions for gravure coating can be adjusted in various ways.

  Therefore, the present invention will be described in more detail with reference to the following examples.

1. Preparation of conductive paint (a) Multi-walled carbon nanotubes (average diameter 10 nm, average length 1 μm)
(B) Polyester resin (Acrylic / polyester copolymer resin)
(C) Using polyethylene wax, with respect to 100 parts by mass as a whole, (a) 0.7 parts by mass, (b) 4 parts by mass, (c) 3.3 parts by mass, water 61 parts by mass, alcohol (IPA) ) It was blended as an emulsion-type aqueous composition at a ratio of 31 parts by mass and dispersed and mixed.

2. It was prepared paper backing cup size performance 28~29g / ^{m 2} base paper (300g ^{/ m} 2) (water content 8.2%).

  In addition, the surface sizing agent (styrene acrylate polymer) was treated by a calendering method using an amount of 1% with respect to the PVA so that the water absorption of the paper board was 5 to 6%.

3. Gravure coating At a temperature of 20 ° C., the conductive paint was applied to a paper board at a coating speed of 35 m / min. Drying was performed by applying hot air at 80 ° C. for 30 seconds.

This formed the conductive layer on both surfaces. The surface resistance was 2.5 × 10 ⁸ Ω.

4). Evaluation The performance of the above conductive carrier tape was evaluated.

  As an evaluation example, the stripping voltage was measured based on the JEITA standard cover tape peeling strength measurement, and the peeling angle was measured at 175 degrees and the peeling speed was measured at 300 mm / min. The results are shown in Table 1.

  For example, as shown in Table 1 above, in the peeling test, the excellent antistatic performance of the conductive carrier tape of the present invention has been demonstrated.

  About the electroconductive carrier tape of this invention, the performance outstanding as follows is evaluated.

1) Correspondence to frictional electrification The situation in which static electricity is charged on electronic components is especially the case when parts stored inside the pocket of the press carrier vibrate in the pocket during transport after taping or storage in the warehouse, especially during the dry season in winter. Caused by

  In contrast, in the conductive paper carrier tape of the present invention on both sides, the upper surface of the pressed conductive layer is the bottom surface of the press pocket. It is confirmed that static electricity is released instantly through the conductive layer on the bottom.

2) The problem of component adhesion to the cover tape due to the peeling charge when peeling the cover tape, stabilization of the peel force, and dust generation during peeling Peeling charging has been solved for the time being by using conductive cover tape. In order to reduce the cost, it is desirable to use a general cover tape for punch mounts that has been widely used in the past. In the present invention, it was confirmed that almost no static electricity was generated due to the effect of the conductive paint applied to the surface of the mount. In addition, since the surface of the mount is coated with a conductive paint, the peel strength of the cover tape, that is, the peeling strength, is much more stable when peeled from the paper surface. Good compatibility is confirmed. And since there is no direct contact with the paper during peeling due to the conductive layer and sealant layer, fluffing during peeling is extremely limited, and the cleanliness during mounting is strongly promoted. In the process, foreign matter such as paper dust and fluff adheres to the surface and pockets of the mount, and the conductive coating applied to both the front and back surfaces hardly causes adhesion due to static electricity. Is confirmed to contribute.

3) Correspondence to mountability In ultra-fine parts, the clearance between the press pocket size and the part size is very narrow. For example, the maximum value in the width direction (A direction) of 0402 part is 0.22 mm. Assuming that the MIN of the narrowest dimension in the pocket lateral A direction is 0.23 mm, this clearance is just 10 μm.

  In order to form such a micro-precision pocket at the time of press molding, the moisture contained in the backing sheet must be retained as much as possible from the time of papermaking to the time of press molding, which contributes to precise pocket molding. Is confirmed.

  Since the moisture on the mount is spontaneously released over time, the release is prevented as much as possible by coating the surface sizing agent mixed in PVA or the like. The conductive carrier tape of the present invention efficiently exhibits the effect of the conductive paint when PVA is applied. Furthermore, the water content is increased by making the conductive paint water-based so that the water is absorbed by the paper. Thereafter, in order to dry the paint, it passes through a drying path at a medium temperature of 70 ° C. to 90 ° C., but is sent to the next step while maintaining the high moisture content of the mount. This high moisture improves the formability of press working and contributes to the formability for ultra-fine parts with severe clearance. Therefore, the conventional paper carrier has been considered to be limited to 0402 size, but its conductivity, cleanliness, good moldability, etc. are taken into account, and application to smaller parts is possible. In other words, it can be applied to ultra-small parts such as 0201/03015 sizes.

Claims (8)

A conductive carrier tape for storing electronic components for storing an ultra-fine chip type electronic component having an AB size of 0.40 mm x 0.20 mm or less, wherein the paper is a mount, and at least the electronic component of the paper mount Conductive paint is applied to the storage surface or both surfaces, and the surface resistance value of the coated surface is 1.0 × 10 ⁴ Ω or more and less than 1.0 × 10 ¹¹ Ω tape.   The conductive layer formed on the coated surface is 0.5 to 30 parts by mass of a conductive agent, 40 to 70 parts by mass of a resin component, and 30 to 60 parts by mass of an additive per 100 parts by mass of the conductive layer. The conductive carrier tape according to 1.   The conductive layer formed on the coated surface contains at least one carbon nanoconductive agent among multi-walled carbon nanotubes, single-walled carbon nanotubes, fullerenes, and carbon nanohorns as a conductive agent. Item 3. The conductive carrier tape according to Item 1 or 2.   The conductive layer formed on the coated surface contains at least one conductive polymer such as polyaniline and polythiophene as a conductive agent. The conductive carrier tape according to one item.   The conductive carrier tape according to any one of claims 1 to 4, wherein the paper board has a water absorption within a range of 3 to 7%. Paper mount, the conductive carrier tape according to claim 1, any one of the 5 cup size performance of the base paper is characterized in that in the range of 26~30g / m ^2.   The conductive paint is an emulsion-type water-based paint containing a conductive agent, a resin component, or an additive, or a solvent-based paint using an organic solvent, according to any one of claims 1 to 6. The electroconductive carrier tape of description.   The carrier tape according to any one of claims 1 to 7, wherein the conductive coating is applied by gravure.