JP2020179596A - Sheet for tray/carrier tape for conveying electronic component, and tray/carrier tape for conveying electronic component using the same - Google Patents

Abstract

To provide a sheet that is excellent in transparency while satisfying various characteristics required for a tray/carrier tape for conveying an electronic component, and a tray/carrier tape for conveying an electronic component using the same.SOLUTION: A sheet is a sheet for a tray/carrier tape for conveying an electronic component and has the following layer (A1) and layer (A2) and layer (B), in which the layer (A1) and the layer (A2) are provided in this order on one surface or both surfaces of the layer (B), and the layer (A2) forms the outermost surface. (A1) Coating layer of carbon nanotube dispersion containing carbon nanotube and polyacid functioning as its dispersant. (A2) Coating layer of binder resin. (B) Base material layer.SELECTED DRAWING: None

Description

The present invention relates to a sheet for an electronic component transport tray / carrier tape and an electronic component transport tray / carrier tape using the same.

As electronic devices incorporating electronic components are required to be smaller, lighter, and more sophisticated, it is possible to transport electronic components with trays and carrier tapes and incorporate them into electronic device products when manufacturing electronic devices. It is done.

The electronic component transport tray is a synthetic resin tray in which a large number of storage sections for storing electronic components whose elements are semiconductor elements such as semiconductor chips, liquid crystal modules, and hard disk components are provided by vacuum molding or the like according to the shape. There is also a carrier tape that is used for transporting and mounting electronic components. The electronic component transport tray stacks a large number of trays with the electronic components inserted in the storage section, and the carrier tape winds up the tray together with the electronic components for transport and storage.

In the electronic component transport tray / carrier tape that transports such electronic components, static electricity is generated due to friction between the tray / carrier tape and the electronic component, friction between the tray / carrier tape, etc. during transport, storage, and other handling. Since there is a problem that the static electricity causes a failure, it is necessary to impart conductivity to the electronic component transport tray / carrier tape to suppress the generation of static electricity.

In order to suppress the generation of static electricity, a conductive material is conventionally kneaded into a synthetic resin sheet that is the base material of an electronic component transport tray / carrier tape, or a synthetic resin sheet having rigidity, moldability, shape retention, etc. A method of coating the surface with an ink containing carbon black or an organic conductive agent is being studied.

However, when an ink using carbon black is used in an amount required to suppress static electricity, the color tone tends to be black and the transparency tends to decrease. Electronic component transport trays and carrier tapes are desired to have high transparency from the viewpoints of determining the presence or absence of components by cameras and sensors and inspecting defective products. Inks using organic conductive agents have high transparency, but tend to lack stability over time because they are organic substances.

Carbon nanotubes are known as a conductive material, but a sheet coated with ink produced by a general dispersion method tends to have a gray color tone and a decrease in transparency.

The technique described in Patent Document 1 has been proposed as a carbon nanotube dispersion liquid capable of forming a film having excellent conductivity and transparency.

International Publication No. 2018/225863

The film produced by the technique of Patent Document 1 has high conductivity and transparency. However, when considering the application to the coating of the electronic component transport tray, the adhesion to the base material is weak and the ink falls off, and the friction resistance and solvent resistance required for the electronic component transport tray ( When removing foreign matter adhering to the tray, it is lightly wiped with a cloth containing IPA), and it is difficult to obtain water resistance and scratch resistance. Since many electronic component transport trays are stacked and used for transport and storage, releasability between trays is required, but the releasability is poor and the trays do not slip when stacked, so they are used for transporting electronic components. You can't get the right one.

The present invention has been made in view of the above circumstances, and while satisfying various characteristics required for an electronic component transport tray / carrier tape, a sheet having excellent transparency and electronic component transport using the same. The challenge is to provide tray carrier tapes.

In order to solve the above problems, the sheet of the present invention is a sheet for an electronic component transport tray or a carrier tape, and has the following (A1) layer, (A2) layer, and (B) layer. The layer (A1) and the layer (A2) are provided in this order on one side or both sides of the layer B), and the layer (A2) forms the outermost surface.
(A1) Coating layer of carbon nanotube dispersion liquid containing carbon nanotubes and a polymer acid that functions as a dispersant thereof (A2) Coating layer of binder resin (B) Base material layer The electronic component transport tray or carrier tape of the present invention , The sheet is used.

According to the sheet of the present invention and the electronic component transport tray / carrier tape using the same, various properties required for the electronic component transport tray / carrier tape, particularly conductivity, inter-layer adhesion, abrasion resistance, and solvent resistance. It has excellent transparency while satisfying water resistance, scratch resistance, and mold releasability.

The present invention will be described in detail below.

In the sheet of the present invention, the layer (A1) is a coating layer of a carbon nanotube dispersion liquid containing carbon nanotubes and a polymer acid that functions as a dispersant thereof (in the following description, "carbon nanotubes" is referred to as "CNT". Also called.). The layer (A1) imparts good conductivity while being excellent in transparency.

The type of CNT is not particularly limited, and conventionally known ones can be used. For example, any of single-walled CNT (SWNT), double-walled CNT (DWNT), multi-walled CNT (MWNT), rope-shaped CNT, and ribbon-shaped CNT can be used. Further, it is also possible to use the metallic CNT or the semiconductor CNT alone which has undergone the separation step of the metallic CNT and the semiconductor CNT.

As the high molecular acid, a (co) weight obtained by (co) polymerizing a raw material monomer containing a monomer having an acidic group such as a monomer having a carboxylic acid group, a monomer having a sulfonic acid group, and a monomer having a phosphoric acid group. Coalescence and the like can be mentioned. The monomer having an acidic group may be used alone or in combination of two or more.

Examples of the monomer having a carboxylic acid group include acrylic acid, methacrylic acid, crotonic acid, itaconic acid, maleic acid, fumaric acid, citraconic acid, 2-methacryloyloxymethylsuccinic acid and the like. These may be used individually by 1 type, and may be used in combination of 2 or more type.

Examples of the monomer having a sulfonic acid group include styrene sulfonic acid such as p-styrene sulfonic acid, vinyl sulfonic acid, allyl sulfonic acid, 2-acrylamide-2-methylpropane sulfonic acid, and 2-hydroxy-3-allyloxy-1. -Propane sulfonic acid, isoprene sulfonic acid and the like can be mentioned. These may be used individually by 1 type, and may be used in combination of 2 or more type.

As the polymer acid, a polymer carboxylic acid such as polyacrylic acid and polymethacrylic acid, and a polymer sulfonic acid such as poly (p-styrene sulfonic acid) are preferable.

The solvent for dispersing the polymer acid and CNT is not particularly limited, but water or an organic solvent can be used. Examples of the organic solvent include alcohol-based organic solvents (for example, methanol, ethanol, 2-propanol, glycerin, ethylene glycol, etc.), ketone-based organic solvents (for example, acetone, methyl ethyl ketone, methyl isobutyl ketone, etc.), and ether-based organic solvents. (For example, diethyl ether, THF, etc.), ester-based organic solvents (methyl acetate, ethyl acetate, n-propyl acetate, n-butyl acetate, isobutyl acetate, etc.), hydrocarbon-based organic solvents (toluene, methylcyclohexane, etc.), etc. Can be mentioned. These may be used individually by 1 type, and may be used in combination of 2 or more type. Among them, water, alcohol-based organic solvent or a mixed solvent thereof is preferable in consideration of dispersibility, response to environmental problems, printability and drying property of ink, and for example, water, methanol, ethanol and 2-propanol. , Glycerin, ethylene glycol, mixed night of water and ethanol, mixed solution of ethanol and 2-propanol, and the like.

In addition to the above-mentioned CNT, polymer acid, and solvent, the CNT dispersion liquid can contain other components as long as the effects of the present invention are not impaired.

For specific details of the CNT dispersion liquid used for the layer (A1), refer to the description of Patent Document 1 in addition to the above. For example, the details, concentration, weight ratio, etc. of CNT and polymer acid in the CNT dispersion liquid, and the predoping step, pre-dispersion step, main dispersion step, etc., which are the manufacturing steps of the CNT dispersion liquid, refer to the description of Patent Document 1. By appropriately selecting the layers, it is possible to obtain a layer (A1) having good electrical connection in the CNT network, excellent conductivity even if the film thickness is reduced, and excellent transparency.

In the sheet of the present invention, the layer (A2) is a coating layer of a binder resin. The layer (A2) improves adhesion, abrasion resistance, solvent resistance, water resistance, scratch resistance, and mold release resistance, which are difficult to achieve by the layer (A1), which is a coating layer of a CNT dispersion liquid. Further, by adjusting the film thickness, the conductivity of the sheet surface does not decrease, and the sheet having excellent transparency can be obtained.

The binder resin is coated as an ink using water, a solvent, or the like as a solvent, and is bound to the (A1) layer by drying. The binder resin is not particularly limited, and examples thereof include water-based or solvent-based polyester resins, polyacrylic resins, polyurethane resins, epoxy resins, and olefin resins.

More specific examples of the binder resin include a solvent-based polyacrylic resin, a water-based acrylic modified polyester resin, and a water-based polyester resin.

Among the above binder resins, water-based or solvent-based polyacrylic resins and water-based or solvent-based polyester resins are preferable.

The solvent of the binder resin is not particularly limited, but water or an organic solvent can be used. These are mainly used in a diluted amount so as to have an appropriate viscosity for printing. The solvent of the aqueous binder resin requires water, and is a mixed solvent with an organic solvent compatible with water such as an alcohol-based organic solvent (for example, methanol, ethanol, 2-propanol, glycerin, ethylene glycol, etc.). You may. The solvent of the solvent-based binder resin is not particularly limited, but is, for example, an alcohol-based organic solvent (for example, methanol, ethanol, 2-propanol, glycerin, ethylene glycol, etc.) and a ketone-based organic solvent (for example, acetone, methyl ethyl ketone, methyl isobutyl). Ketones, etc.), ether-based organic solvents (eg, diethyl ether, THF, etc.), ester-based organic solvents (methyl acetate, ethyl acetate, n-propyl acetate, n-butyl acetate, isobutyl acetate, etc.), hydrocarbon-based organic solvents (eg, isobutyl acetate, etc.) (Toluene, methylcyclohexane, etc.) and the like. These may be used individually by 1 type, and may be used in combination of 2 or more type.

Other components can be blended in the binder resin ink as long as the effects of the present invention are not impaired. Examples of other components include additives such as a cross-linking agent, a wax, a leveling agent, a surface conditioner, and an antifoaming agent. These may be used individually by 1 type, and may be used in combination of 2 or more type. The amount of the additive is not particularly limited, but is, for example, about 1 to 10% by mass depending on the type and the like.

The base material layer, which is the layer (B) in the sheet of the present invention, imparts rigidity, moldability, shape retention, and the like. A resin material having molding processability can be used for the base material layer. As the resin material, a synthetic resin, particularly a thermoplastic resin is preferable. Specific examples thereof include polyester resin, polyolefin resin, polystyrene resin, polyamide resin, polyvinyl chloride resin, and polycarbonate resin. Other components such as known additives usually blended in the resin material can be blended in the base material layer as long as the effects of the present invention are not impaired. Further, the base material layer may be a plurality of layers, that is, the layer (B) may be a laminate composed of a plurality of resin layers.

The thickness of the layer (B) is not particularly limited, but is preferably 0.1 to 1.5 mm, preferably 0.3 to 1.0 mm, in consideration of rigidity as a tray for transporting electronic components and carrier tape, tray moldability, and the like. More preferred.

In the sheet of the present invention, the CNT dispersion liquid to be the (A1) layer is applied to one side or both sides of the (B) layer and dried to form a coating layer, and the binder resin to be the (A2) layer is applied to the surface thereof. It is produced by drying to form a coating layer.

The method of applying the CNT dispersion liquid as the (A1) layer and the binder resin as the (A2) layer is not particularly limited, and is, for example, gravure printing, screen printing, casting method, dip coating method, spin coating method, and bar coating. Examples thereof include a method, a blade coating method, a die coating method, a spray coating method, and an inkjet method. Of these, gravure printing is preferable. When gravure printing is used, high-speed printing is possible, and in gravure printing, the film thickness is usually small, but the CNT dispersion liquid as the (A1) layer has good electrical connection in the CNT network. Since it has excellent conductivity and the required conductivity can be secured even if the film thickness is reduced, high transparency can be obtained.

In the sheet of the present invention, the film thickness of the (A1) layer is not particularly limited, but the film thickness after drying is preferably 0.01 to 1 μm in consideration of imparting conductivity and transparency, application of gravure printing, and the like. , 0.01-0.3 μm is more preferable.

In the sheet of the present invention, the film thickness of the (A2) layer is the adhesion, abrasion resistance, solvent resistance, water resistance, and scratch resistance, which are difficult to achieve by the (A1) layer, which is the coating layer of the CNT dispersion liquid. Considering the point that the sheet has excellent releasability, ensures the conductivity of the sheet surface, and has excellent transparency, and the application of gravure printing, etc., considering the application of gravure printing, etc., after drying The film thickness is preferably 0.1 to 10 μm, more preferably 0.5 to 5 μm.

The sheet of the present invention can be used as an electronic component transport tray by molding. The molding method is not particularly limited, but for example, known methods such as vacuum forming, press molding, compressed air molding, and vacuum pressure air forming can be applied. The sheet is molded so as to form a large number of storage portions that serve as pockets according to the size and shape of the electronic component to be placed. In this electronic component transport tray, for example, electronic components whose elements are semiconductor elements are inserted into a storage portion, a large number of trays are stacked, transported to a required place, stored, and then picked up from this tray in a subsequent process. used. Further, the sheet of the present invention can be processed or molded as necessary and used as a carrier tape.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples.
(Preparation of CNT dispersion liquid)
17.5 g of PAA (polyacrylic acid weight average molecular weight 5000 Fuji Film Wako Pure Chemical Industries, Ltd.) was weighed and dissolved in 150 ml of a 9: 1 mixed solution of 2-propanol and ethanol, and then 11.7 g of SWCNT (Oxial TUBALL CNT 93%) was added. Added and mixed. This mixed solution was pre-dispersed (stirred) for 30 minutes with a stirrer. After that, ultrasonic dispersion was performed for 300 minutes while keeping the treatment temperature at around 5 ° C. to prepare a uniform CNT dispersion liquid.

(Evaluation)
Tape peeling test An adhesive tape was attached to each of the coating sheets and vacuum-formed trays prepared in the following Examples and Comparative Examples, and a vertical tension test was conducted. The resistance value before and after the test was measured, and it was visually observed whether the thin film was damaged or peeled, and the adhesion performance of the coating film was judged.
Tape used: JIS Z1522 compatible Nichiban cellophane tape (registered trademark) CT-15
Surface resistance value measuring device: High Leicester UP MCP-HT450 resistance meter (Mitsubishi Chemical Analytech Co., Ltd.)

Abrasion fastness test (friction resistance)
The abrasion fastness test was performed on each of the coated sheets and the vacuum-formed trays produced in the following Examples and Comparative Examples under the following conditions. By observing the resistance value before and after the test and the contamination status of the wearer, the adhesion performance of the coating film was judged.
Test conditions Measuring instrument: Gakushin type wear fastness tester Wearer: Kanakin No. 3 Speed: 30 times Reciprocating / min Load: 200 g
Number of times: 1000 times (round trip)
In addition, a tape peeling test was also performed on the sample after the test under the above conditions.

Alcohol resistance The alcohol resistance test was performed on each of the coated sheets and vacuum-formed trays prepared in the following Examples and Comparative Examples under the following conditions. By observing the resistance value before and after the test and the contamination status of the wearer, the adhesion performance of the coating film was judged.
Test conditions Measuring instrument: Gakushin type wear fastness tester Wearer: IPA wet gauze Speed: 30 times reciprocation / minute Load: 200 g
Number of times: 50 times (round trip)
In addition, a tape peeling test was also performed on the sample after the test under the above conditions.

Water resistance Each of the coated sheets and vacuum-formed trays produced in the following Examples and Comparative Examples was subjected to a water resistance test under the following conditions. By observing the resistance value before and after the test and the contamination status of the wearer, the adhesion performance of the coating film was judged.
Measuring instrument: Gakushin type wear fastness tester Wearer: Gauze wet with water Speed: 30 times Reciprocating / min Load: 200 g
Number of times: 100 times (round trip)
In addition, a tape peeling test was also performed on the sample after the test under the above conditions.

Scratch resistance For each of the coated sheets and vacuum-formed trays produced in the following Examples and Comparative Examples, the coat sample was scratched with a nail, and the presence or absence of paint peeling was visually confirmed.

Releasability after vacuum forming After vacuum forming each coating sheet prepared in the following Examples and Comparative Examples into a tray, the tray and the tray were placed on top of each other to confirm the releasability.

Comparative Example 1
The uniform CNT dispersion liquid prepared by the above method was coated with 4 g / m ² · wet on A-PET (thickness 0.5 mm) by gravure printing to form a film.

Comparative Example 2
In order to improve the adhesion of the CNT dispersion liquid to A-PET, various water-based and solvent-based binder resins shown in Table 1 were added and mixed with the uniform CNT dispersion liquid prepared by the above method to prepare an ink. .. The produced ink was coated on A-PET (thickness 0.5 mm) at 4 g / m ² · wet to form a film.
A tape peeling test was conducted on the applied sample to confirm the adhesion to A-PET.

添加量を１％以下にすると、Ａ−ＰＥＴへの密着性向上に効果がなかった。１％以上にすると、作製したインキに凝集・ゲル化が起きてしまい、インキとしての使用ができなかった。

When the addition amount was 1% or less, there was no effect in improving the adhesion to A-PET. If it is set to 1% or more, the produced ink will aggregate and gel, and cannot be used as an ink.

Comparative Example 3
In order to improve the friction resistance of the CNT dispersion liquid, the waxes shown in Table 2 were added and mixed with the uniform CNT dispersion liquid prepared by the above method to prepare an ink. The produced ink was coated on A-PET (thickness 0.5 mm) at 4 g / m ² · wet to form a film.
The applied sample was subjected to a tape peeling test after the above-mentioned wear fastness test to confirm the abrasion resistance.

添加量を１％以下にすると、耐摩擦性の向上に効果がなかった。１％以上にすると、作製したインキに凝集・ゲル化が起きてしまい、インキとして使用できなかった。

When the addition amount was 1% or less, there was no effect in improving the friction resistance. If it is set to 1% or more, the produced ink will aggregate and gel, and cannot be used as an ink.

Example 1
In order to improve the adhesion and wear resistance of the CNT dispersion liquid to A-PET, 4 g / g of the uniform CNT dispersion liquid prepared by the above method on A-PET (thickness 0.5 mm) by gravure printing. m ² · wet coating, after the film was formed, and the overcoat ink was 4g ^/ m 2 · wet coating in the gravure printing press. In this way, a coating sheet was produced, and a tray was produced by vacuum forming.
The overcoat ink is made by adding an additive to a solvent-based polyacrylic resin, stirring it, and then diluting it with a 6: 4 mixed solution of ethyl acetate and propyl acetate to a suitable printing quality (Zahn Cup No. 3 (Rigosha) 15 to 20s). , Made.

Example 2
A coating sheet was prepared under the same conditions as in Example 1 except that the type of overcoat ink was changed, and a tray was prepared by vacuum forming. The overcoat ink was prepared by adding an additive to a water-based acrylic modified polyester resin, stirring the mixture, and then diluting with a 1: 1 mixed solution of IPA and water.

Example 3
A coating sheet was prepared under the same conditions as in Example 1 except that the type of overcoat ink was changed, and a tray was prepared by vacuum forming. The overcoat ink was prepared by adding an additive to a water-based polyester resin, stirring the ink, and then diluting with a 1: 1 mixed solution of IPA and water.

Table 3 summarizes the results of the above evaluations for each Example and Comparative Example.

次に、表４に示す各サンプルのシートについて、透過率（装置：ＵＶ−１８００（島津型））を測定した。その結果を表４に示す。

Next, the transmittance (device: UV-1800 (Shimadzu type)) was measured for each sample sheet shown in Table 4. The results are shown in Table 4.

Claims (2)

A sheet for an electronic component transport tray or a carrier tape, which has the following (A1) layer, (A2) layer, and (B) layer, and has the (A1) layer and (A1) layer on one or both sides of the (B) layer. A sheet in which layers (A2) are provided in this order, and layer (A2) forms the outermost surface.
(A1) Coating layer of carbon nanotube dispersion liquid containing carbon nanotubes and a polymer acid that functions as a dispersant thereof (A2) Coating layer of binder resin (B) Base material layer An electronic component transport tray or carrier tape using the sheet according to claim 1.