JP7300052B2 - Cover tape for paper carrier tape, package for transporting electronic parts, and package for electronic parts - Google Patents

Description

TECHNICAL FIELD The present invention relates to a cover tape for a paper carrier tape, a package for transporting electronic components, and a package for electronic components.

Carrier tapes used for transporting or storing electronic components such as microchips are known as packaging materials. By using this carrier tape, it is possible to store and transport electronic components or the like that are too small to handle by storing them one by one in the recesses provided in the carrier tape.
The carrier tape has a recess for accommodating electronic components and the like, and is packaged by covering the recess with a cover tape. After being transported or stored in this state, the carrier tape is set in a component assembling machine (mounting machine) called a mounter, and the stored electronic components can be taken out.

Techniques relating to such cover tapes for carrier tapes include, for example, those described in Patent Document 1 (Japanese Unexamined Patent Application Publication No. 2004-51105).

Patent Literature 1 describes a cover tape comprising a laminate of a plastic film layer, a thermoadhesive resin layer containing a tackifier, and an antistatic antiblocking layer. In Patent Document 1, an antistatic antiblocking layer is formed with a thickness of 0.01 to 0.5 μm from a composition in which a quaternary ammonium salt type cationic surfactant is dispersed in a urethane resin, an acrylic resin, or a polyester resin. disclosed a configuration that

JP-A-2004-51105

As a carrier tape, a paper carrier tape using paper as a base material is sometimes used. In this case, the cover tape for the paper carrier tape has an appropriate adhesiveness (i.e., adhesiveness to the extent that it can be easily peeled off while having the necessary adhesiveness to the paper carrier tape). ) and that there is no peeling of the paper when peeling from the paper carrier tape (that is, the paper of the base material is not peeled and becomes fuzzy). In addition, there is also a demand for antistatic properties to prevent pick-up failures, such as electronic components adhering to the cover tape or popping out of the cover tape when the electronic components are taken out.
According to studies by the present inventors, conventional cover tapes for paper carrier tapes, such as those described in Patent Document 1, have adhesiveness to paper carrier tapes, easy peelability from paper carrier tapes, and antistatic properties. It became clear that there is room for improvement in the performance balance of

The present invention has been made in view of the above circumstances, and provides a cover tape for a paper carrier tape that has an excellent balance of adhesion to the paper carrier tape, easy peeling from the paper carrier tape, and antistatic properties. is.

The inventors of the present invention have made extensive studies in order to achieve the above object. As a result, by laminating the substrate layer (A), the heat-sealable layer (B) containing a thermoplastic resin, and the antistatic layer (C) containing a conductive polymer in this order, a paper carrier The present inventors have found that a cover tape for a paper carrier tape can be obtained that has an excellent balance of adhesiveness to the tape, easy peelability from the paper carrier tape, and antistatic properties, and have completed the present invention.

That is, according to the present invention, the following cover tape for paper carrier tape, package for transporting electronic parts, and package for electronic parts are provided.

[1]
A substrate layer (A), a heat-sealable layer (B) containing a thermoplastic resin, and an antistatic layer (C) containing a conductive polymer in this order,
A paper carrier tape in which the thermoplastic resin has a melt flow rate (MFR) of 0.1 g/10 min or more and 150 g/10 min or less, measured under conditions of 190° C. and a load of 2160 g, in accordance with JIS K7210:1999. cover tape.
[2]
In the paper carrier tape cover tape described in [1] above,
A cover tape for a paper carrier tape, wherein the heat-sealable layer (B) contains a tackifying resin.
[3]
In the paper carrier tape cover tape described in [1] or [2] above,
A cover tape for a paper carrier tape, wherein the thermoplastic resin comprises polyolefin.
[4]
In the paper carrier tape cover tape described in [3] above,
A cover tape for a paper carrier tape, wherein the polyolefin comprises at least one selected from polyethylene and ethylene copolymers.
[5]
In the cover tape for paper carrier tape described in [4] above,
A cover tape for a paper carrier tape, wherein the ethylene copolymer comprises an ethylene/vinyl acetate copolymer.
[6]
In the cover tape for paper carrier tape according to any one of [1] to [5] above,
A cover tape for a paper carrier tape, wherein said conductive polymer comprises polythiophene.
[7]
In the cover tape for paper carrier tape according to any one of [1] to [6] above,
A cover tape for a paper carrier tape, wherein the antistatic layer (C) has a thickness of 0.001 μm or more and 5.0 μm or less.
[8]
a paper carrier tape having recesses capable of accommodating electronic components;
a cover tape thermally adhered to the paper carrier tape;
An electronic component transport package comprising
A package for transporting electronic components, wherein the cover tape comprises the paper carrier tape cover tape according to any one of [1] to [7] above.
[9]
The package for transporting electronic components according to [8] above;
an electronic component housed in the recess of the paper carrier tape;
An electronic component package.

ADVANTAGE OF THE INVENTION According to this invention, the cover tape for paper carrier tapes excellent in performance balance of adhesiveness to a paper carrier tape, easy peelability from a paper carrier tape, and antistatic property can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS It is sectional drawing which showed typically an example of the structure of the cover tape for paper carrier tapes of embodiment which concerns on this invention.

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In addition, unless otherwise specified, the numerical range "X to Y" represents X or more and Y or less.

1. 1. Paper Carrier Tape Cover Tape FIG. 1 is a cross-sectional view schematically showing an example of the structure of a paper carrier tape cover tape 10 according to an embodiment of the present invention.
The paper carrier tape cover tape 10 according to the present embodiment includes a base layer (A), a heat-sealable layer (B) containing a thermoplastic resin, an antistatic layer (C) containing a conductive polymer, are provided in this order, and the melt flow rate (MFR) of the thermoplastic resin is 0.1 g / 10 minutes or more and 150 g / 10 minutes or less, measured under the conditions of 190 ° C. and 2160 g load, in accordance with JIS K7210: 1999 is.

As described above, according to the study of the present inventors, the conventional cover tape for paper carrier tape as described in Patent Document 1 has adhesiveness to the paper carrier tape and easy peeling from the paper carrier tape. It has become clear that there is room for improvement in the performance balance of antistatic properties and antistatic properties. The inventors of the present invention have made extensive studies in order to achieve the above object. As a result, by laminating the substrate layer (A), the heat-sealable layer (B) containing a thermoplastic resin, and the antistatic layer (C) containing a conductive polymer in this order, a paper carrier It has been found that a cover tape for paper carrier tapes having an excellent balance of adhesiveness to tapes, easy peelability from paper carrier tapes, and antistatic properties can be obtained.
That is, the cover tape 10 for a paper carrier tape according to the present embodiment has the above-described layer structure, thereby achieving a good performance balance of adhesion to the paper carrier tape, easy peelability from the paper carrier tape, and antistatic properties. can be

Each layer constituting the paper carrier tape cover tape 10 according to the present embodiment will be described below.

<Base material layer (A)>
The base material layer (A) is a layer provided for the purpose of improving properties such as handleability, mechanical properties, and heat resistance of the cover tape 10 for paper carrier tape.
The substrate layer (A) includes, for example, paper, aluminum, polyester (e.g., polyethylene terephthalate), polyethylene, polypropylene, polystyrene, polyamide, aluminum-deposited polyester, aluminum-deposited polypropylene, silica-deposited polyester, and the like. film) and the like. Among these, a sheet or film made of polyethylene terephthalate is preferable. These substrate layers (A) may have not only a single layer structure but also a laminated structure of two or more layers.

The thickness of the substrate layer (A) is, for example, 5 μm or more and 100 μm or less, preferably 10 μm or more and 50 μm or less, from the viewpoint of mechanical strength and workability.
The surface of the substrate layer (A) to be adhered (or laminated) to the heat-sealable layer (B) is subjected to corona treatment, plasma treatment, flame treatment in order to increase the adhesive strength with the heat-sealable layer (B). Physical treatment such as treatment, ozone treatment, etc. may be performed. Moreover, you may perform well-known anchor coat processing to a base material layer (A).

<Heat-sealable layer (B)>
The heat-sealing layer (B) is a layer for imparting heat-sealing properties to the paper carrier tape cover tape 10 according to the present embodiment, and contains a thermoplastic resin. The heat-sealable layer (B) may be a single layer or may have a laminated structure of two or more layers.
The thickness of the heat-sealable layer (B) is, for example, 1 μm or more and 300 μm or less, preferably 5 μm or more and 200 μm or less, more preferably 10 μm or more and 150 μm or less.

Examples of the thermoplastic resin according to the present embodiment include polyethylene such as high-density polyethylene, high-pressure low-density polyethylene, low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), and ethylene/unsaturated carboxylic acid-based Polymers, ethylene-based copolymers such as ethylene-vinyl ester copolymers, ethylene-α-olefin copolymer elastomers, polypropylene, propylene-based copolymers (copolymers of propylene and α-olefins other than propylene) , polybutene, and other olefinic (co)polymers, and polyolefins such as polymer blends thereof. Examples of the α-olefin include propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene, 1-dodecene, 4-methyl-1-pentene and the like.
Among these, from the viewpoint of excellent heat-sealing properties, the thermoplastic resin preferably contains polyolefin, and more preferably contains at least one selected from the group consisting of polyethylene and ethylene-based copolymers, polyethylene and ethylene. - It is more preferable to contain at least one selected from the group consisting of vinyl ester copolymers, it is still more preferable to contain an ethylene/vinyl ester copolymer, and it is still more preferable to contain an ethylene/vinyl acetate copolymer. Preferably, it is particularly preferred to include both ethylene-vinyl acetate copolymer and linear low density polyethylene.

Based on JIS K7210: 1999, the melt flow rate (MFR) of the thermoplastic resin measured under the conditions of 190 ° C. and 2160 g load is 0.1 g / 10 minutes or more and 150 g / from the viewpoint of workability and mechanical strength. It is preferably 10 minutes or less, more preferably 0.1 g/10 minutes or more and 50 g/10 minutes or less, and 0.5 g/10 minutes or more and 50 g/10 minutes or less is 1.0 g/10 minutes. Minutes or more and 30 g/10 minutes or less is particularly preferred.

The content of the thermoplastic resin in the heat-sealable layer (B) according to the present embodiment is preferably 50% by mass or more and 100% by mass or less when the entire heat-sealable layer (B) is taken as 100% by mass. It is more preferably 70% by mass or more and 99% by mass or less, still more preferably 7075% by mass or more and 95% by mass or less, and still more preferably 80% by mass or more and 95% by mass or less. This makes it possible to improve the balance of adhesiveness with the antistatic layer, heat sealability, and the like.

(ethylene/vinyl ester copolymer)
The ethylene-vinyl ester copolymer according to the present embodiment contains at least a structural unit derived from ethylene and a structural unit derived from vinyl ester. The ethylene/vinyl ester copolymer may be a random copolymer, a block copolymer, or an alternating copolymer.
Examples of the ethylene/vinyl ester copolymer include ethylene/vinyl butyrate copolymer, ethylene/vinyl acetate copolymer, ethylene/vinyl propionate copolymer, and ethylene/vinyl stearate copolymer. Ethylene-vinyl acetate copolymers are preferred.
The content of structural units derived from ethylene is preferably 50% by mass or more and 95% by mass or less, and preferably 70% by mass or more, relative to the total mass of the ethylene-vinyl ester copolymer, from the viewpoint of film-forming processability. It is more preferably 95% by mass or less.
From the viewpoint of adhesiveness, the content of structural units derived from vinyl esters is preferably 5% by mass or more and 50% by mass or less with respect to the total mass of the ethylene-vinyl ester copolymer, and 5% by mass or more and 30% by mass. % or less is more preferable.
The ethylene-vinyl ester copolymer may further contain structural units derived from monomers other than vinyl ester and ethylene, as long as the properties of one embodiment of the present invention are not impaired. However, it is preferable that the content of structural units derived from other monomers does not exceed the content of structural units derived from vinyl ester.

The ethylene/vinyl ester copolymer may be produced by a conventionally known method, or commercially available ones may be used.

The melt flow rate (MFR) of the ethylene-vinyl ester copolymer measured under conditions of 190°C and a load of 2160g according to JIS K7210: 1999 is 0.1g/10 from the viewpoint of workability and mechanical strength. min or more and 150 g/10 min or less, more preferably 0.1 g/10 min or more and 50 g/10 min or less, and 1.0 g/10 min or more and 50 g/10 min or less. /10 min or more and 30 g/10 min or less is particularly preferable.

(tackifying resin)
The heat-sealable layer (B) preferably contains a tackifying resin in addition to the thermoplastic resin described above. Since the tackifying resin has a function of imparting tackiness to the resin, it can facilitate adjustment of the adhesive strength of the heat-sealable layer (B).
The tackifying resin is selected from resins having a function of imparting tackiness. Examples of tackifying resins include aromatic hydrocarbon resins, alicyclic hydrocarbon resins, aliphatic hydrocarbon resins, terpene resins, rosins, styrene resins, and coumarone/indene resins.

Examples of aromatic hydrocarbon resins include resins obtained by polymerizing fractions containing at least one vinyl aromatic hydrocarbon having 8 to 10 carbon atoms such as vinyltoluene, indene, and α-methylstyrene, and the like. Examples thereof include resins obtained by copolymerizing a fraction and an aliphatic hydrocarbon fraction.
As the alicyclic hydrocarbon resin, for example, a resin obtained by polymerizing a diene component in a spent C4-C5 fraction after cyclodimerization, a resin obtained by polymerizing a cyclic monomer such as cyclopentadiene, an aromatic and resins obtained by intranuclear hydrogenation of hydrocarbon resins (for example, hydrogenated petroleum resins, etc.).
As the aliphatic hydrocarbon resin, for example, a fraction containing at least one mono- or diolefin having 4 to 5 carbon atoms such as 1-butene, isobutene, butadiene, 1,3-pentadiene and isoprene is polymerized. resins obtained by
Terpene resins include, for example, α-pinene polymer, β-pinene polymer, dipentene polymer, terpene/phenol copolymer, α-pinene/phenol copolymer, and hydrogenated products thereof.
Rosins include, for example, rosins such as gum rosin, wood rosin and tall oil, modified products thereof, etc. Modified products include those subjected to modification such as hydrogenation, disproportionation, dimerization and esterification. .
Examples of styrenic resins include low-molecular-weight resinous polymers obtained by polymerizing styrenic monomers such as styrene, vinyltoluene, α-methylstyrene, and isopropyltoluene.

The tackifying resin is preferably a resin having a softening point of 85°C to 130°C. Generally, when the softening point is 85° C. or higher, excellent heat resistance tends to be exhibited, and when it is 130° C. or lower, excellent tackiness imparting effect tends to be exhibited.
As the softening point of the tackifying resin, a value measured based on the softening point test method (ring and ball method) in accordance with JIS-K2207:2006 can be used.
The content of the tackifying resin in the heat-sealable layer (B) according to the present embodiment is 1% by mass or more and 30% by mass or less when the entire heat-sealable layer (B) is taken as 100% by mass. is preferred, more preferably 5% by mass or more and 25% by mass or less, and even more preferably 5% by mass or more and 20% by mass or less.

The heat-sealable layer (B) according to the present embodiment may contain components other than the thermoplastic resin and the tackifying resin within a range that does not impair the object of the present invention. Other components are not particularly limited, but for example, plasticizers, antioxidants, ultraviolet absorbers, antistatic agents, surfactants, colorants, light stabilizers, foaming agents, lubricants, crystal nucleating agents, crystallization Accelerators, crystallization retarders, catalyst deactivators, thermoplastic resins other than the above thermoplastic resins, thermosetting resins, inorganic fillers, organic fillers, impact modifiers, slip agents, cross-linking agents, cross-linking aids agents, tackifiers other than the above tackifying resins, silane coupling agents, processing aids, release agents, anti-hydrolysis agents, heat stabilizers, anti-blocking agents, anti-fogging agents, flame retardants, flame retardant aids, Light diffusing agents, antibacterial agents, antifungal agents, dispersing agents, other resins, and the like can be used. Other components may be used singly or in combination of two or more.

<Antistatic layer (C)>
The antistatic layer (C) is a layer for preventing or suppressing electrification of the paper carrier tape cover tape 10 according to the present embodiment, and contains a conductive polymer. These antistatic layers (C) may have not only a single layer structure but also a laminated structure of two or more layers.

The conductive polymer is not particularly limited, but examples thereof include polythiophene, polyaniline, polypyrrole, polyethyleneimine, and allylamine-based polymers. Such conductive polymers can be used alone or in combination of two or more. Polythiophene is preferable from the viewpoint of low humidity dependence of antistatic performance. Here, polythiophene refers to a polymer of unsubstituted or substituted thiophene. Poly(3,4-ethylenedioxythiophene) is particularly preferred as the substituted thiophene polymer.

The antistatic layer (C) may contain other antistatic components other than the conductive polymer, such as organic conductive substances, inorganic conductive substances, and antistatic agents, if necessary.
The antistatic layer (C) may contain a binder resin in addition to the conductive polymer described above. As a method of forming the antistatic layer (C), when adopting a method of applying a coating material for forming the antistatic layer to the heat-sealable layer (B) and drying or curing, the binder resin is It is used by dissolving it in a solvent or as an aqueous emulsion (aqueous dispersion).
As the binder resin, known binder resins can be used, and water-soluble resins or water-dispersible resins having hydrophilic groups such as carboxyl groups, such as chlorinated polypropylene resins, styrene-acrylic copolymer resins, polyurethanes, Examples include emulsions such as polyester ionomers, water-soluble polyester resins, and water-dispersible polyester resins.

The method of forming the antistatic layer (C) is not particularly limited. and dried, and if necessary, a curing treatment (heat treatment, ultraviolet treatment, etc.) is performed. As the coating method, known methods such as gravure coating, roll coating, dip coating and spraying can be used. If necessary, the surface to be coated may be subjected to corona discharge treatment or may be subjected to primer treatment with another coating agent.

As the solvent used for the coating material, for example, water or a mixed solvent of water and a water-soluble organic solvent is used. Examples of water-soluble organic solvents include alcohols such as methanol, ethanol, isopropyl alcohol, and n-propyl alcohol; glycols such as ethylene glycol, diethylene glycol, glycol monomethyl ether, and glycol monoethyl ether; and derivatives thereof, acetone, methyl ethyl ketone, and the like. ketones, water-soluble ethers such as tetrahydrofuran, and water-soluble esters such as ethyl acetate.
The total concentration of the conductive polymer dissolved or dispersed in the solvent and the optionally used binder resin is not particularly limited as long as the concentration is suitable for the coating method on the heat-sealable layer (B). , 0.1 to 40% by mass, preferably 0.2 to 30% by mass.
Components other than the above, such as surfactants and antifoaming agents for improving the wettability of the coating material, can be added to the coating material, if necessary.

The thickness of the antistatic layer (C) is not particularly limited and can be appropriately set.

<Middle layer>
The cover tape 10 for paper carrier tape according to the present embodiment may have an intermediate layer such as polyethylene between the heat-sealable layer (B) and the base layer (A). The intermediate layer is provided to enhance the adhesion between the heat-sealable layer (B) and the base layer (A), or to enhance the workability when forming the heat-sealable layer (B). It is a layer that can be

2. Method for producing cover tape for paper carrier tape As a method for laminating the heat-sealable layer (B) on the base material layer (A), for example, a thermoplastic resin and, if necessary, a tackifying resin and other components and a composition containing a twin-screw kneader, a kneader ruder, etc., and a method of extrusion laminating the resulting mixture onto the substrate layer (A); A so-called thermal lamination method, a dry lamination method, a sand lamination method, a co-extrusion inflation method, a co-extrusion T-die method, etc., in which the resulting composition is laminated with the substrate layer (A).

3. Package for transporting electronic components The package for transporting electronic components according to the present embodiment includes a paper carrier tape having recesses capable of accommodating electronic components, and a cover tape thermally adhered to the paper carrier tape for transporting electronic components. , wherein the cover tape includes the cover tape 10 for paper carrier tape according to the present embodiment.
As the paper carrier tape, for example, a bottom cover tape is heat-sealed on one side (lower side) of a storage board having a plurality of punched holes formed at regular intervals in the length direction, and the punched holes can accommodate electronic components. Those used as recesses; those in which a storage board is embossed and a plurality of recesses capable of storing electronic components are formed at regular intervals along the longitudinal direction of the storage board; and the like.
Since the electronic component transport package according to the present embodiment is configured using the paper carrier tape cover tape 10 according to the present embodiment, the adhesiveness to the paper carrier tape and the easy peeling from the paper carrier tape and excellent antistatic performance balance.
Further, an electronic component package according to this embodiment includes the electronic component transport package according to this embodiment, and an electronic component accommodated in a concave portion of a paper carrier tape.

The paper carrier tape according to the present embodiment is set in a machine for assembling parts (mounting machine), is embedded with electronic parts such as microchips, is stored, transported, etc., and then can be taken out as desired. It is formed on the scale.
Further, the package for transporting electronic components according to the present embodiment uses a paper carrier tape and a paper carrier tape cover tape 10, and electronic components (eg, IC chips, microchips, electrostatic sensitive devices, etc.) on the paper carrier tape. The cover tape 10 for paper carrier tape is placed on the opening surface where the storage part (recess) in which is stored is opened so that the antistatic layer (C) faces the opening surface, and the cover tape 10 for paper carrier tape It is made by heat-sealing from above.

Although the embodiments of the present invention have been described above with reference to the drawings, these are examples of the present invention, and various configurations other than those described above can also be adopted.

EXAMPLES The present invention will be specifically described below based on Examples, but the present invention is not limited to these Examples.

The details of the materials used to make the cover tape for the paper carrier tape are as follows.

<Base material layer (A)>
・ PET film: manufactured by Toray Industries, product name: Lumirror, thickness 25 μm
Anchor coating agent (also called ac): Seikadyne 2710A (manufactured by Dainichiseika Kogyo Co., Ltd.) + Seikadyne 2710C (manufactured by Dainichiseika Kogyo Co., Ltd.) + ethyl acetate = 2 + 4 + 31 (parts by mass) (solid concentration: 7% by mass)

<Heat-sealable layer (B)>
・Evaluation resin 1: Ethylene-vinyl acetate copolymer 1 (EVA1, MFR = 9 g/10 min, structural unit derived from vinyl acetate (vinyl acetate content): 10% by mass) + linear low-density polyethylene (mLLDPE, MFR = 3.8 g/10 min, density = 903 kg/m ³ ) + tackifying resin (manufactured by Arakawa Chemical Industries, product name: Alcon P-115) = 75 + 10 + 15 (mass ratio)
Evaluation resin 2: Ethylene-vinyl acetate copolymer 2 (EVA2, MFR = 24 g/10 min, structural unit derived from vinyl acetate (vinyl acetate content): 5.5% by mass) + ethylene-vinyl acetate copolymer 3 (EVA3, MFR = 150 g/10 min, structural unit derived from vinyl acetate (vinyl acetate content): 19% by mass) + tackifying resin (manufactured by Arakawa Chemical Industries, Ltd., product name: Alcon P-115) = 87 + 5 + 8 ( mass ratio)

<Antistatic layer (C)>
・Thiofoene-based antistatic (AS) agent: Antistatic agent containing poly(3,4-ethylenedioxythiophene), manufactured by Kaken Sangyo Co., Ltd., product name: MC-100
・Cationic surfactant: manufactured by Kao Corporation, product name: Electrostripper QN

<Middle layer>
LDPE: Low density polyethylene (manufactured by Mitsui Dow Polychemicals, product name: Milathon 16P, MFR = 3.7 g/10 min, density = 923 kg/m ³ )

[Examples 1-2 and Comparative Examples 1-3]
A cover tape for a paper carrier tape was produced by the following procedure.
(1) Using an extrusion laminator with a 65 mmΦ extruder (L/D = 28), the anchor coating agent was applied in-line to the corona-treated surface of the PET film, and then the resin temperature under the die was 320°C on the anchor coating agent. to extrude a LDPE melt film to prepare a laminate (PET film (25 μm)/ac·LDPE (15 μm)).
(2) Then, using an extrusion laminator with a 65 mm Φ extruder (L/D = 28), the above laminate (PET film (25 µm) / ac LDPE (15 µm)) was coated on LDPE at a temperature below the die of 240 ° C. The evaluation resin was extruded to prepare a laminate (PET film (25 μm)/ac·LDPE (15 μm)/evaluation resin (15 μm)).
(3) Then, the evaluation resin surface of the laminate (PET film (25 μm) / ac LDPE (15 μm) / evaluation resin (15 μm)) is corona-treated to improve the wetting of the antistatic agent or surfactant. (processing density: 300 W/m ² /min) and then by RK PrintCoat Instruments Ltd. 6 μm (wet thickness before drying) of an antistatic agent or surfactant is applied to the evaluation resin layer using a K303 Multi Coater manufactured by Kao Co., Ltd., dried in an oven, and a cover tape for paper carrier tape for evaluation (PET (25 μm)/ac·LDPE (15 μm)/evaluation resin (15 μm)/antistatic agent or surfactant) was obtained.
Here, for Comparative Examples 2 and 3, only the above (1) and (2) were performed, and (3) was not performed.
The following evaluations were performed on the obtained cover tapes for paper carrier tapes. The obtained results are shown in Table 1, respectively.

<Evaluation of antistatic properties>
Using a resistivity meter (Mitsubishi Chemical Analytic Tech, Hiresta-UP, UR-100 probe), under the conditions of measurement voltage 500 V, measurement time 30 seconds, 23 ° C., 50% RH, cover tape for paper carrier tape The surface resistivity was measured to evaluate the antistatic properties. It means that the lower the surface resistivity, the better the antistatic property.
·criterion:
○: Surface resistivity is less than 1.0E14Ω/□ ×: Surface resistivity is 1.0E14Ω/□ or more

[Evaluation of Adhesion and Peelability]
The adhesiveness and peelability of the cover tape for paper carrier tape were evaluated under the following conditions.
<Sample>
・ Paper (adherend): thickness = 0.4 mm, basis weight: 380 gsm
<Seal conditions>
・ Taping machine: VS-120 manufactured by Vanguard Systems Co., Ltd.
・Sealing iron: 2 rows, width = 0.5 mm, length = 48 mm
・Seal temperature: 200°C
・Sealing time: 0.1 second ・Sealing times: 2 times <Peeling conditions (seal strength measurement)>
・Device: VG-35 manufactured by Vanguard Systems Co., Ltd.
・Peeling speed: 300mm/min
・Peeling angle: 165 to 180°
<Adhesion evaluation>
·criterion:
○: Seal strength is 5 g or more and 50 g or less ×: Seal strength is less than 5 g or more than 50 g <Paper peeling state evaluation>
・Procedure: The sample after peeling (seal strength measurement) under the above conditions was observed under a microscope.
·criterion:
〇: No adhesion of paper fibers or almost no adhesion of paper fibers ×: A large amount of adhesion of paper fibers

The cover tapes for paper carrier tapes of Examples 1 and 2 were excellent in performance balance of adhesion, easy peelability and antistatic properties. On the other hand, the cover tapes for paper carrier tapes of Comparative Examples 1 to 3 were inferior in performance balance of adhesiveness, easy peelability and antistatic properties.

This application claims priority based on Japanese Patent Application No. 2019-061213 filed on March 27, 2019, and the entire disclosure thereof is incorporated herein.

A base layer B heat-sealable layer C antistatic layer 10 cover tape for paper carrier tape

Claims (6)

A substrate layer (A), a heat-sealable layer (B) containing a thermoplastic resin, and an antistatic layer (C) containing a conductive polymer in this order,
According to JIS K7210: 1999, the melt flow rate (MFR) of the thermoplastic resin is 1.0 g/10 min or more and 150 g/10 min or less, measured under conditions of 190 ° C. and a load of 2160 g ,
When the thermoplastic resin is composed of a plurality of thermoplastic resins, the melt flow rate (MFR) of each thermoplastic resin is 1.0 g/10 minutes or more and 150 g/10 minutes or less,
The content of the thermoplastic resin in the heat-sealable layer (B) is 80% by mass or more and 95% by mass or less when the entire heat-sealable layer (B) is taken as 100% by mass,
The thermoplastic resin contains an ethylene-vinyl ester copolymer,
A cover tape for a paper carrier tape , wherein said conductive polymer comprises polythiophene . In the cover tape for paper carrier tape according to claim 1,
A cover tape for a paper carrier tape, wherein the heat-sealable layer (B) contains a tackifying resin. In the cover tape for paper carrier tape according to claim 1 or 2 ,
A cover tape for a paper carrier tape, wherein the ethylene-vinyl ester copolymer comprises an ethylene-vinyl acetate copolymer. In the cover tape for paper carrier tape according to any one of claims 1 to 3 ,
A cover tape for a paper carrier tape, wherein the antistatic layer (C) has a thickness of 0.001 µm or more and 5.0 µm or less. a paper carrier tape having recesses capable of accommodating electronic components;
a cover tape thermally bonded to the paper carrier tape;
An electronic component transport package comprising
A package for transporting electronic components, wherein the cover tape comprises the cover tape for paper carrier tape according to any one of claims 1 to 4 . The package for transporting electronic components according to claim 5 ;
an electronic component housed in the recess of the paper carrier tape;
An electronic component package.

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