JP3801296B2 - Top cover tape - Google Patents

Description

【００１８】
さらに、このトップカバーテープをキャリアテープに接着後、50ｍ／分と300 mm／分の剥離速度で剥離テストを行ったところ、デラミ現象を生ぜず、破断強度および引裂伝播抵抗に優れていた。この結果を表２に示す。表中のPS系コーティングとは、ポリスチレン系樹脂製シートの両面にケッチェンブラック等の導電性付与剤をアクリル系等のバインダーに分散させ、これを塗布したものであり、PS系３層練り込みとは、ポリスチレン系樹脂中に導電性付与剤を予め練り込んだものを押出し成形等により、シート状にしたものからなるキャリアテープである。表中の○印はデラミ現象を生ぜず、特に問題のなかったものを示し、×印はデラミ現象を生じたものを示す。・-・ 印は、層間が接着せず、トップカバーテープが得られなかったことを示す。
【００１９】
【表２】

【００２０】
実施例２：
膜厚16μm の二軸延伸ポリエチレンテレフタレートフィルム上に、膜厚が30μm となるように熱可塑性ポリウレタン樹脂を押出しラミネート法によって成膜し、さらに、この熱可塑性ポリウレタン樹脂上に、膜厚16μm の二軸延伸ポリエチレンテレフタレートフィルムを積層した。使用したポリエチレンテレフタレートフィルムは、実施例１と同様の接着性改善処理を施したものである。得られた積層フィルムの一方の面にアクリルエチレン系の接着剤を塗布して、PET ／TPU ／PET の３層構造のトップカバーテープを得た。
このトップカバーテープを、実施例１と同様に、特性測定（表１参照）、剥離テスト（表２参照）を行ったところ、デラミ現象を生ぜず問題がなかった。
【００２１】
比較例１、比較例２：
比較例１は、実施例２における中間層の二軸延伸ポリエチレンテレフタレートフィルムに代えて、ポリエチレン樹脂を用いた以外は、実施例２と同様にして、PET ／PE／PET の３層構造のトップカバーテープを製造した。
比較例２は、比較例１で用いたアクリルエチレン系接着剤をポリエステル系接着剤に替えた以外は、比較例１と同じである。
実施例１、２と同様に、特性測定（表１参照）、剥離テスト（表２参照）を行ったところ、いずれも実施例のものよりも劣るものであった。
【００２２】
【発明の効果】
本発明のトップテープを採用することによって、キャリアテープから高速でトップテープを剥した場合においても、トップテープの切れやデラミ現象の発生を防止することができる。さらに製造に特別な設備を必要とせず、製造コストの大幅な上昇を抑えることができる。
【図面の簡単な説明】
【図１】本発明のトップカバーテープを示し、（ａ）は、基材が、ポリウレタン樹脂層の両面に二軸延伸フィルムが積層されてなる３層構造を示す断面図であり、（ｂ）は、基材が、ポリウレタン樹脂層の片面に二軸延伸フィルムが積層されてなる２層構造を示す断面図である。
【符号の説明】
１・・・・・・・・・・・・・・ポリウレタン樹脂層、
２、２’・・・・・・・・二軸延伸フィルム、
３・・・・・・・・・・・・・・接着剤層、
４・・・・・・・・・・・・・・帯電防止剤。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a top cover tape which is a cover material of a carrier tape used for storing and transporting surface mount components such as various electronic components and precision instrument components.
[0002]
[Prior art]
In recent years, for storing and transporting surface mount parts such as various electronic parts and precision equipment parts, carrier tape with embossed parts according to the shape of each part, and preventing parts from falling off after storing the parts in this embossed part For protection, a top cover tape that is sealed using a heat seal or an adhesive as a lid is used as a packaging material. The top cover tape is peeled off at the time of mounting, components are taken out, and attached to the board.
[0003]
The top cover tape currently on the market is composed of an adhesive that adheres to the base material and the carrier tape. For those that need countermeasures against static electricity, the antistatic agent is applied to the base material surface or the adhesive surface. Alternatively, a conductive agent or an antistatic agent or a conductive agent kneaded with an adhesive is coated.
Conventionally, as a base material of a top cover tape, a film having a two-layer or three-layer structure using a biaxially stretched polyethylene terephthalate film and a polyethylene resin is used. By using such a multilayer film as a base material, the strength is higher than that of a biaxially stretched polyethylene terephthalate single-layer film, and the effect of preventing breakage during mounting is recognized. The top cover tape having such a configuration has a manufacturing advantage that a tape having excellent transparency can be obtained and can be manufactured with existing technology and equipment.
[0004]
[Problems to be solved by the invention]
However, it is well known that polyethylene terephthalate and polyethylene are difficult to adhere to each other. Usually, these two types of materials are bonded together with an isocyanate, an amine, an imine, or a combination thereof. A coating agent is used. However, there is a limit to the adhesion using an anchor coating agent, and a film having a three-layer structure composed of a biaxially stretched polyethylene terephthalate film / polyethylene resin / biaxially stretched polyethylene terephthalate film is used as a carrier tape cover material, that is, a top cover tape. When used, if the adhesive strength to the carrier tape is too high, when the top cover tape is peeled off from the carrier tape, it does not peel between the adhesive and the carrier tape, which is a normal peeling form, and the top cover tape base There may be a delamination phenomenon (hereinafter simply referred to as a delamination phenomenon) in which the polyethylene terephthalate film constituting the material is peeled between the polyethylene resin and the polyethylene terephthalate film remains on the carrier tape side.
[0005]
When the delamination phenomenon occurs, a part of the top cover tape is covered on the component stored in the carrier tape, and the stored component cannot be taken out.
Similarly, when a two-layered film composed of a biaxially stretched polyethylene terephthalate film / polyethylene resin is used, a delamination phenomenon may occur in which the polyethylene resin remains in the form of a film on the carrier tape side.
[0006]
Further, when the top cover tape is peeled from the carrier tape during mounting, the top cover tape may be finely scratched due to mechanical factors of the mounting machine peeling mechanism. In such a case, the peeling force applied to the top cover tape may induce cutting of the top cover tape with the fine scratches generated previously as the origin. When the top cover tape runs out, the mounting machine must be stopped and repaired, which greatly reduces work efficiency.
When the biaxially stretched polyethylene terephthalate film / polyethylene resin film is used as the top cover tape, the breaking strength and tear strength are stronger than when the polyethylene terephthalate film and polyethylene film are used alone, respectively. Propagation resistance will not be as strong as expected. This means that if a fine flaw is generated and starts to be cut, the self-repairing ability is poor and the cut cannot be stopped.
[0007]
The present invention provides a top cover tape that improves the tear propagation resistance of the top cover tape in view of the above problems that occur during mounting, and does not cause breakage or delamination when the top cover tape is peeled off from the carrier tape. Is an issue.
[0008]
[Means for Solving the Problems]
Top cover tape of the present invention, housing the various components and the like, a lid of the carrier tape used for conveying, composed of a base adhesive layer, the substrate is thick. 5 to 50 mu m A biaxially stretched film is laminated on one or both sides of a thermoplastic polyurethane resin layer having a hard segment having a urethane structure and a soft segment having a polyester structure, a polyether structure, a polycarbonate structure or a copolymerized structure thereof. that it has a two-layer or three-layer structure consisting of Te and features a.
The polyurethane resin having such a structure has both properties as an elastomer as well as thermoplasticity.
[0009]
Examples of the biaxially stretched film include polyester resin, polyamide resin, and polypropylene resin, and a biaxially stretched polyethylene terephthalate film that is transparent and has high rigidity is preferably used.
As a countermeasure against static electricity, an antistatic agent or a conductive agent can be coated on the outer layer surface of the substrate or the surface of the adhesive layer. Alternatively, an antistatic agent or a conductive agent kneaded with the adhesive can be coated. The application method is preferably a gravure coating method, but a spray method can also be adopted as a simpler method.
Further, in order to increase the lamination strength between the biaxially stretched film and the polyurethane resin layer, the surface of the biaxially stretched film is subjected to corona treatment, and then the polyurethane resin layer is laminated on the corona treated surface. It can also laminate | stack between an axial stretched film and a polyurethane resin layer using the isocyanate type | system | group, an amine type, an imine type | system | group, or the anchor coating agent which combined these. Moreover, what provided the easily bonding layer on the surface of a biaxially stretched film may be used.
[0010]
The top cover tape of the present invention has a configuration in which the polyurethane resin is arranged in one layer constituting the base material of the tape, thereby improving the adhesive strength between the laminated base materials, and further, the high elasticity of the polyurethane resin, Tear resistance improves tear propagation resistance, and when mounting components, the components are peeled off without causing breakage or delamination, and components can be easily taken out. A top cover tape having a three-layer structure having such a structure is preferably used because the tear propagation resistance is further improved as compared with the two-layer structure.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, it will be described in more detail with reference to the drawings.
FIG. 1 shows a top cover tape according to the present invention. FIG. 1A shows a base material having a three-layer structure in which biaxially stretched films 2 and 2 ′ are laminated on both surfaces of a polyurethane resin layer 1. An adhesive layer 3 is provided on the lower surface of the axially stretched film 2 ′. The adhesive layer 3 is heat sealed or pressure sealed to the carrier tape.
In FIG. 1B, the base material has a two-layer structure in which a biaxially stretched film 2 is laminated on one surface of a polyurethane resin layer 1, and an adhesive layer 3 is provided on the lower surface of the polyurethane resin layer 1. Furthermore, an antistatic agent (or conductive agent) 4 is applied to the upper surface of the biaxially stretched film 2 as a countermeasure against static electricity.
[0012]
The biaxially stretched film 2 has a thickness of 5 to 50 μm, preferably 8 to 20 μm. If the thickness is less than 5 μm, the rigidity is insufficient and the strength as a film cannot be maintained. If it exceeds 50 μm, the rigidity is too strong and lacks flexibility, which tends to cause a sealing failure during heat sealing.
The polyurethane resin layer 1 has a hardness measured by a method based on JIS K-7311 of 100 degrees or less, and if it exceeds 100 degrees, the rigidity is too strong and lacks flexibility and is not used as a film. It becomes difficult. Further, the thickness is preferably 5 to 50 μm, and if it is less than 5 μm, the expected elasticity and tear strength cannot be obtained, and if it exceeds 50 μm, the thermal conductivity at the time of sealing deteriorates and a sealing failure tends to occur.
[0013]
Thermoplastic polyurethane resins are made by reacting prepolymers, diisocyanates and chain extenders. As the prepolymer, polyester, polyether, polycarbonate, or a copolymer thereof is used. An —OH group, that is, a hydroxyl group, a phenol group, or the like is introduced at the end of the prepolymer. This functional group is reacted with diisocyanate to introduce isocyanate groups at both ends of the prepolymer. A polyurethane resin is obtained by reacting this reaction product with a bifunctional active hydrogen compound as a chain extender, that is, a diol, a diamine or the like. At this time, if either isocyanate or active hydrogen functional group is excessive, it becomes a thermosetting polyurethane resin, and if diisocyanate group = active hydrogen functional group, it becomes a linear polyurethane resin, It has both plasticity and elastomer properties.
Normal polyurethane resin is not a problem level in normal use form, but has the disadvantage of discoloration, and if transparency is a problem, use non-yellowing type polyurethane resin to further improve transparency Film. In addition, the lamination of the biaxially stretched film and the polyurethane resin does not require any special equipment and suppresses a significant increase in production cost according to the usual extrusion lamination method, dry lamination method or coating method. be able to.
[0014]
The adhesive layer for heat-sealing the top cover tape to the carrier tape may be provided on the substrate by a gravure coating method, an extrusion lamination method, or a dry lamination method. The adhesive used at this time is an adhesive having an adhesive force of 10 to 120 gf per 1 mm of the seal width, preferably 20 to 70 gf. When the adhesive strength is 10 gf or less, the top cover tape and the carrier tape are peeled off during transportation after the carrier tape is heat-sealed, and the stored product falls off. When the adhesive strength exceeds 120 gf, when the top cover tape is peeled off from the carrier tape at the time of mounting, the carrier tape vibrates and the stored product easily protrudes. Even when it is difficult to peel off, the top cover tape of the present invention can prevent breakage and delamination. Not only such a heat seal type but also a pressure type adhesive, that is, a pressure-sensitive adhesive, can be used as long as it has an adhesive strength of 10 to 120 gf.
In addition, an antistatic agent or a conductive agent can be kneaded into the adhesive to take antistatic measures.
[0015]
【Example】
Next, embodiments of the top cover tape of the present invention will be described together with comparative examples.
Example 1:
A thermoplastic polyurethane resin was extruded and laminated on a biaxially stretched polyethylene terephthalate film having a film thickness of 16 μm so as to have a film thickness of 30 μm. As the polyethylene terephthalate film, in order to improve the adhesion and increase the lamination strength with the thermoplastic polyurethane resin, a surface treated in advance with an isocyanate-based coating agent as an anchor coating agent was used. An acrylic ethylene adhesive was applied to the thermoplastic polyurethane resin side of the obtained laminated film to obtain a top cover tape having a two-layer structure composed of a polyethylene terephthalate film and a polyurethane resin.
[0016]
The tensile strength at break, elongation, and tear propagation resistance of the base material used in this top cover tape were measured and as shown in Table 1, and were superior to those of Comparative Examples described later. The breaking strength and elongation were measured according to JIS C-2318, and tear propagation resistance was measured according to ASTM D 1938. PET stands for polyethylene terephthalate film, TPU stands for thermoplastic polyurethane resin, and PE stands for polyethylene resin.
[0017]
[Table 1]

[0018]
Further, after the top cover tape was bonded to the carrier tape, a peel test was conducted at a peel rate of 50 m / min and 300 mm / min. As a result, no delamination phenomenon occurred and the tear strength and tear propagation resistance were excellent. The results are shown in Table 2. The PS-based coating in the table is a coating obtained by dispersing a conductivity-imparting agent such as ketjen black in an acrylic-based binder on both sides of a polystyrene-based resin sheet. The term “carrier tape” refers to a carrier tape made of a material obtained by kneading a conductivity imparting agent in a polystyrene resin in advance by extrusion or the like. The circles in the table indicate that no delamination phenomenon occurred and there was no particular problem, and the x marks indicate that the delamination phenomenon occurred.・-Mark indicates that the top cover tape could not be obtained because the layers did not adhere.
[0019]
[Table 2]

[0020]
Example 2:
A thermoplastic polyurethane resin is formed on a biaxially stretched polyethylene terephthalate film with a film thickness of 16 μm by extrusion lamination so that the film thickness becomes 30 μm. Further, a biaxial film with a film thickness of 16 μm is formed on the thermoplastic polyurethane resin. A stretched polyethylene terephthalate film was laminated. The polyethylene terephthalate film used was subjected to the same adhesiveness improvement treatment as in Example 1. An acrylic ethylene adhesive was applied to one surface of the obtained laminated film to obtain a top cover tape having a three-layer structure of PET / TPU / PET.
When this top cover tape was subjected to characteristic measurement (see Table 1) and peel test (see Table 2) in the same manner as in Example 1, no delamination phenomenon occurred and no problem was found.
[0021]
Comparative Example 1 and Comparative Example 2:
Comparative Example 1 is a PET / PE / PET three-layer top cover in the same manner as in Example 2 except that a polyethylene resin was used instead of the biaxially stretched polyethylene terephthalate film of the intermediate layer in Example 2. Tape was manufactured.
Comparative Example 2 is the same as Comparative Example 1 except that the acrylic ethylene adhesive used in Comparative Example 1 is replaced with a polyester adhesive.
Similar to Examples 1 and 2, when the characteristic measurement (see Table 1) and the peel test (see Table 2) were performed, both were inferior to those of the Examples.
[0022]
【The invention's effect】
By adopting the top tape of the present invention, even when the top tape is peeled off from the carrier tape at a high speed, it is possible to prevent the top tape from being cut and the delamination phenomenon from occurring. Furthermore, no special equipment is required for manufacturing, and a significant increase in manufacturing cost can be suppressed.
[Brief description of the drawings]
FIG. 1 shows a top cover tape of the present invention, in which (a) is a cross-sectional view showing a three-layer structure in which a base material is formed by laminating a biaxially stretched film on both surfaces of a polyurethane resin layer; These are sectional views showing a two-layer structure in which a base material is formed by laminating a biaxially stretched film on one surface of a polyurethane resin layer.
[Explanation of symbols]
1 ... Polyurethane resin layer,
2, 2 '... Biaxially stretched film,
3 ... Adhesive layer,
4 ... Antistatic agent.

Claims (3)

Storage of various components such as a lid of the carrier tape used for conveying, composed of a base adhesive layer, the substrate is a thickness of. 5 to 50 mu m, the hard segments having urethane structure And a two-layer or three-layer structure in which a biaxially stretched film is laminated on one or both sides of a thermoplastic polyurethane resin layer having a polyester structure, a polyether structure, a polycarbonate structure, or a soft segment having a copolymer structure thereof A top cover tape characterized by comprising: An antistatic agent or a conductive agent is coated on the outer surface of the base material or the surface of the adhesive layer, or an antistatic agent or a conductive agent kneaded with the adhesive is coated. Item 10. The top cover tape according to Item 1. After the corona treatment is applied to the surface of the biaxially stretched film, a polyurethane resin layer is laminated on the corona-treated surface, or between the biaxially stretched film and the polyurethane resin layer, an isocyanate, amine, imine The top cover tape according to claim 1 or 2, wherein the top cover tape is laminated using an anchor coating agent comprising a system or a combination thereof .

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