KR100715550B1 - Strong carrier tape sheet - Google Patents

Abstract

The present invention relates to a carrier tape sheet for transporting high-strength electric and electronic components, and a high-strength carrier tape using the same. In the case of a carrier tape based on general-purpose polystyrene or high-impact polystyrene, an impact reinforcing agent is provided to compensate for low layer elongation. When styrene-based copolymers such as styrene-butadiene-styrene copolymers are mixed, the elongation increases but the tensile strength is inferior. In order to compensate for this, an object of the present invention is to provide a styrenic carrier tape fabric in which tensile strength and elongation are increased at the same time. By using the fabric of the present invention, it is possible to manufacture a carrier tape fabric for transporting electrical and electronic components without increasing the elongation and good toughness and high tensile strength. In particular, by appropriately selecting the intermediate layer material and the surface layer material, it is possible to manufacture a highly transparent carrier tape fabric having greatly improved toughness, and by mixing a suitable dye, a carrier tape sheet having a certain color can be produced and a conductive polymer is effective on the surface. By forming a permanent antistatic layer comprising the component can be produced an antistatic carrier tape sheet having a high strength while having a transparent or a certain color.

Description

High Strength Carrier Tape Fabric {STRONG CARRIER TAPE SHEET}

The present invention relates to a high strength carrier tape, and more particularly, to a high strength carrier tape having improved tensile strength and elongation.

General electric and electronic components such as light emitting devices and connectors and various electronic components such as semiconductor integrated circuit chips are carried in carrier tapes called tape and reel for convenience of transportation and assembly. The carrier tape is a polymer film used to form a pocket using vacuum and pressure at a temperature of 150-250 degrees Celsius, and then put the semiconductor integrated circuit and electronic components in the pocket, cover it, and roll it on a reel to transport it. Say

The presently used polymer fabric for carrier tape is mainly extruded from styrene resin to a thickness of about 0.2-0.5 mm, and then cut into appropriate widths to form pockets. At this time, it is divided into two types according to the required characteristics of the packaged product. One is to use an antistatic carrier tape sheet sensitive to static electricity such as semiconductor integrated circuit chip, and general electric and electronic components such as general light emitting device or connector are not antistatic. Insulating carrier tape sheets are used. Here, in the case of an antistatic carrier tape sheet for transporting a semiconductor integrated circuit chip, in order to provide antistatic property, an intermediate layer is made of acrylonitrile-butadiene-styrene copolymer, and the surface layer is 20-30 parts by weight of carbon black mixed with a styrene polymer. The mixture is prepared by triple extrusion. In the case of the carrier tape sheet for transporting general electrical and electronic parts, a suitable amount of styrene-butadiene-styrene copolymer is mixed with the polymer resin such as general purpose polystyrene, high impact polystyrene, and styrene copolymer copolymerized with acrylic components. To extrude into a one-layer structure while increasing the elongation.

Among them, the required physical properties of the carrier tape fabric for transporting general electrical and electronic components may be various, and the most important required physical properties are largely two. First, the parts inside the packaging should be checked with the naked eye or light, so the carrier tape fabric itself should be transparent. Second, take out the parts from the transported carrier tape and mount them automatically. The machine stops working and a strong tensile force acts on the carrier tape. If the mechanical properties such as tensile strength and elongation of the carrier tape are bad, the carrier tape should not be stretched or broken. High strength is more important than transparency among the two required physical properties, because it is necessary to prevent the components from being separated from the carrier tape due to errors during mounting.

In the case of the carrier tape fabric for transporting general electrical and electronic components, well-known techniques are general purpose polystyrene, high impact polystyrene, styrene copolymer copolymerized with acrylic component, transparent acrylonitrile-butadiene-styrene copolymer, styrene-butadiene copolymer, styrene- Resin such as butadiene-styrene copolymers are mixed and extruded into a one-layer structure to be used as it is without antistatic treatment.

The raw materials are selected and used in consideration of various properties such as moldability and heat sealing with a cover, and are generally used in combination with a transparent styrene resin and a resin that can reinforce impact properties. For example, the styrene-butadiene copolymer is transparent, but the elongation is too high to compensate for this, 10-30 parts by weight of a copolymer modified with a general purpose polystyrene transparent or very low elongation, or modified with a general purpose polystyrene and acrylic component It is mixed and extruded into a single layer structure.

However, these styrene resin mixtures have poor compatibility with each other, so the transparency is degraded due to light scattering in the visible region, or the tensile strength is mostly 400 kgf / mm ² or less, or the elongation is very low, less than 10%. It has been pointed out that the carrier tape is broken by an error of. Thus, in order to confirm in advance that the carrier tape breaks due to the error of the mounting machine during automatic mounting, a simple test is performed to check whether the carrier tape breaks by grasping one side of the carrier tape and pulling the other side momentarily. In the case of the carrier tape manufactured by the above problem occurs that the carrier tape is broken during the simple test. In order to prevent this, increasing the content of the styrene-butadiene-styrene copolymer as an impact modifier increases the elongation, but the tensile strength is too low below 400 kgf / mm ^{2 It} is difficult to manufacture a high-strength carrier tape sheet by known techniques.

In addition, since the carrier tape fabric manufactured by a known technique has no antistatic property, in the case of a small part, the part may be attached to the cover while peeling off the sealed cover. This is known to be due to static electricity generated in the carrier tape by friction during transportation of the parts contained in the carrier tape, in order to compensate for this, it is necessary to invent the fabric for the carrier tape which is simultaneously provided with antistatic properties while maintaining transparency.

Therefore, the above-mentioned high strength carrier tape fabrics, that is, the strength is at least 400 kgf / mm ² or more, the elongation is more than 30%, visible light transmittance of 60% or more at 550 nanometer, without any surface treatment There is a need for a technology of manufacturing a carrier tape fabric capable of forming a permanent antistatic layer containing a conductive polymer as an active ingredient, and the invention of a carrier tape molded therefrom.

In the present invention, the tensile strength is at least 400 kgf / mm ² or more, the elongation is 30% or more, the visible light transmittance at 550 nanometers is 60% or more and the permanent polymer containing the conductive polymer as an active ingredient on the surface without any surface treatment The present invention provides a manufacturing technology of a carrier tape fabric capable of forming an antistatic layer, and a carrier tape fabric formed therefrom and a high-strength carrier tape for transporting electronic components manufactured therefrom.

It is an object of the present invention to provide a high strength carrier tape fabric having good mechanical properties such as tensile strength and elongation.

In order to achieve the above object, in the present invention, in manufacturing the carrier tape fabric having a three-layer structure by using the coextrusion method, the mechanical properties such as tensile strength and elongation are different from those of the existing heat-sealing type cover by varying the intermediate layer and the surface layer material. The method of manufacturing a high strength carrier tape fabric is also used.

The polymer that can be used in the intermediate layer of the present invention has a tensile strength of 250 kgf / mm ² or more, elongation of 5% or more and visible light transmittance (550 nanometer) 40% or more of the polymer can be used, general-purpose polystyrene, Most styrene-based polymers, ester groups, olefin groups, carbonate groups, such as high-impact polystyrene, styrene-acrylic copolymers modified with acrylic components, copolymers modified with acrylonitrile components, copolymers modified with butadiene-based components, Amorphous or semicrystalline polymers having functional groups such as ether groups are particularly effective. Even if the tensile strength of the intermediate layer material is less than 250 kgf / mm ² , the thickening of the surface layer may increase the tensile strength, but the tensile strength is so low that the thickness of the surface layer should be considerably thick. It is rather disadvantageous because it may cause problems such as punching after embossing.

In addition, the polymer that can be used as the surface layer material may be any polymer having a tensile strength of 450 kgf / mm ² or more, an elongation of 100% or more, and a visible light transmittance of 80% or more at 550 nanometers. Particularly effective are polymers having good compatibility with existing heat-sealing covers, such as polymers and carbonate polymers.

The reason for selecting the polymer having the above properties as the intermediate layer and the surface layer material is that the technique of the present invention uses a triple extrusion method, and if the total thickness of both surface layers is 10-80% of the total thickness, the tensile strength of the intermediate layer material And even if the physical properties such as elongation is a little bad, if the material having good tensile strength and elongation is selected for the surface layer can be obtained the physical properties to be achieved by the present invention. The same applies to the visible light transmittance, for example, a polymer having 40% visible light transmittance as an intermediate layer is 40% of the total thickness and a polyester polymer having 90% visible light transmittance is 60% of the total thickness on the surface layer. By triple extrusion, a carrier tape having a very high transparency of about 70% can be produced.

Carrier tapes must be pocketed with heat, pressure, or vacuum in a sized pocket for component mounting. At this time, if the intermediate layer and the surface layer material is composed of only a polymer resin, the heat transfer at the surface may be poor while the heat is applied for thermoforming. Therefore, for proper heat transfer, the components that can help heat transfer can be mixed. As the components that can help heat transfer, most inorganic fillers can be used. Fillers that can be used here include almost all particulate inorganic fillers such as silica, titanium oxide, talc, calcium carbonate, or metal oxides such as tin oxide and indium oxide. 1-20% by weight. If the content of the filler is less than 1% by weight, the heat transfer effect is insignificant, and if the content of the filler is higher than 20% by weight, it is inefficient because it impedes the flowability of the carrier tape fabric and the extrudability or the embossing is difficult. For example, tin oxide is a metal oxide particle which itself has a light blue color, and when mixed with 10% by weight, light transmittance is reduced by about 10%, while the heat transfer rate is greatly increased, so that the heat transfer effect during molding is very good.

When the particulate inorganic filler is mixed, these inorganic fillers may slightly decrease the denseness of the polymer material, thereby increasing punching ability during hole punching after embossing and reducing the occurrence of burr, which is more effective.

In the case of triple extrusion in order to implement the above-described technique, adhesion between the surface layer and the intermediate layer may be poor due to compatibility problems between the intermediate layer and the surface layer material. In this case, if the surface layer material is mixed with 0.05-30% by weight of the intermediate layer material and the surface layer material is partially mixed with the intermediate layer material, the adhesion between the intermediate layer and the surface layer during extrusion is greatly improved.

When producing a high strength carrier tape fabric by the triple extrusion method, the ratio of the thickness of the intermediate layer and both surface layers of the carrier tape fabric is determined by the mechanical properties such as the desired tensile strength and the mechanical properties of the material used. It is effective to make the total thickness of both surface layers 10-80% of the total thickness when manufacturing the base fabric by the extrusion method. If the thickness ratio of both surface layers is less than 10%, the thickness of the surface layer is so low that it is difficult to manufacture to have a uniform surface layer by triple coextrusion method, and the impact enhancement effect is insignificant. It is rather disadvantageous because it has a small triple extrusion effect.

Carrier tape fabric of the present invention can be used for the purpose of forming a permanent antistatic layer comprising a conductive polymer and a binder that is compatible with the existing cover as an active ingredient. In this case, in order to form an antistatic layer without additional surface treatment to improve the wettability and adhesion with the surface layer material, it is more effective if the main material of the component used in the surface layer is an ester polymer, a carbonate polymer or a styrene polymer. In particular, in the case of styrene-based polymer, polystyrene itself has poor adhesion to the antistatic layer due to the difference in polarity, and thus requires a separate surface treatment. However, when the styrene copolymer modified with acrylonitrile or acrylic component is mixed with polystyrene, it is very effective because it has good wettability and adhesion with an antistatic coating liquid composed of a water-dispersible conductive polymer without any surface treatment.

To this end, by applying a permanent antistatic coating liquid containing a conductive polymer to a heat-sealing organic binder on the surface of the carrier tape fabric, and using a solution coating method or by vapor phase polymerization to form a conductive polymer layer directly on the surface of the carrier tape fabric or Direct polymerization methods such as liquid phase polymerization can be used.

In the case of the heat-sealing cover, the solution coating method is the most effective of the above method, which means that the antistatic layer using the conductive polymer formed on the surface layer should have good heat-sticking cover and heat adhesiveness, in the case of the solution coating method mixed with the heat-sealing binder This is because it is possible to impart antistatic properties and at the same time to impart heat sealing properties, whereas if the surface layer is made of only a conductive polymer by direct polymerization, heat sealing properties with a heat sealing type cover cannot be guaranteed. However, any method may be used for the pressure-sealing cover.

When manufacturing a carrier tape fabric using the technique of the present invention, by mixing a dye that can give a color to at least one layer or more layers can be produced a carrier tape fabric capable of color separation.

Hereinafter, the present invention will be described in detail with reference to the following examples. However, the following examples are only examples for describing the present invention and do not limit the scope of the present invention.

<Comparative Example 1-7>

Comparative Example 1-7 summarizes the mechanical properties of the representative polymer used as the carrier tape fabric material and the mechanical properties and other properties of some mixtures.

Table 1. Characteristics of various polymers

Tensile Strength (kgf / mm ² ) Elongation (%) Permeability ¹ (%) Peel force ² (g) Comparative Example 1 GPPS (100) ³ 420 5 87 53 Comparative Example 2 HIPS (100) 347 3.4 40 48 Comparative Example 3 SBA (100) 316 3.2 85 62 Comparative Example 4 SB / GPPS / SBS (50/30/20) 305 25 50 54 Comparative Example 5 Transparent ABS / HIPS (70/30) 330 4 45 47 Comparative Example 6 HIPS + SBA (70/30) 320 7 56 49 Comparative Example 7 PET (100) 570 480 90 59

¹ : Light transmittance at 550 nanometers, thickness: 0.3 mm, ² : Sumitomo Kaba (grade grade), sealing temperature: 160 degrees, pressure: 40 psi, ³ : numbers in parentheses are parts by weight. GPPS: general purpose polystyrene, HIPS: high impact polystyrene, SBA: styrene-butylacrylic acid copolymer, SB: styrene-butadiene copolymer, SBS: styrene-butadiene-styrene copolymer, ABS: acrylonitrile-butadiene-styrene copolymer , PET: Polyester Copolymer

As shown in Comparative Example 1-7, the styrene-based polymer alone or when mixed, the tensile strength is less than 400 kgf / mm ² or less, or the elongation is very low, less than 10%, especially when the styrene resin is mixed As light scattering increases, it can be seen that visible light transmittance greatly decreases. Therefore, it can be seen that the styrene-based polymer alone or in a mixture of more than one kind is insufficient to prepare a high strength carrier tape. On the other hand, polyester has a very good tensile strength and elongation and a very good visible light transmittance, but it is too bad to be used as a carrier tape material due to its strong toughness and poor heat resistance.

<Example 1-3>

Example 1-3 summarizes the characteristic of the carrier tape sheet which produced the comparative example 4 as an intermediate | middle layer, and made the polyester of the comparative example 7 into 20-60% in both surfaces on the surface layer.

As shown in Examples 1-3 above, the tensile strength and elongation of the interlayer material were 305 kgf / mm ^2, respectively. It is 25%, and it is placed in the middle layer, and the polyester with good tensile strength and elongation is extruded to the surface layer. As the thickness of the surface layer increases, the tensile strength and elongation increase. It can be seen that the tensile strength and the elongation are remarkably improved as the thickness of the surface layer increases as kgf / mm ² and the elongation is increased to 105%.

Table 2. Examples 1-3

Tensile strength (kgf / mm2) Elongation (%) Permeability ¹ (%) Peel force ² (g) Example 1 ³ Example 2 Example 3  Interlayer / surface layer thickness ratio: 10:80:10 15:70:15 20:60:20  410 450 470  45 67 105  60 67 72  57 58 59

¹ : Light transmittance at 550 nanometer, thickness: 0.3 mm, ² : Sumitomo Kaba (grade grade), sealing temperature: 160 degrees, pressure: 40 psi, ³ : the interlayer material was prepared using the material of Comparative Example 4 and applied to the surface layer. Thickness ratio of the intermediate layer and the surface layer when using the polyester of Comparative Example 7.

<Example 4>

Example 4 is to prepare a carrier tape fabric of a dark gray close to black color by mixing 1 part by weight of titanium monoxide and 1 part by weight of carbon black in the intermediate layer and the surface layer material when manufacturing the carrier tape fabric by the method of Example 3. Except for the same as in Example 3.

The tensile strength of the carrier tape fabric prepared by the above method was 475 kgf / mm2, the elongation was 100%, and the tensile strength and elongation did not change significantly, but the color of the carrier tape fabric having a dark color of black system could be prepared. . At this time, the peel strength after heat sealing at 160 degrees with the existing kava was 58 grams, similar to that of Comparative Example 7. This is because the material of the surface layer is the same as polyester and the heat sealing property depends on the properties of the surface.

Example 5

Example 5 was prepared on the surface of the carrier tape fabric prepared by the method of Example 3 except for forming a permanent antistatic agent containing the active polymer as an active ingredient and then drying the surface to form an antistatic layer having a thickness of 1 micron, Example 3 Is the same as At this time, the technology for producing an antistatic liquid using a conductive polymer used the method described in the patent application. (Reference: Korean Patent Application No. 10-2005-0042878, description of Examples 13-15). 4 g of 3,4-polyethylenedioxythiophene aqueous dispersion solution (HCStarck, Germany), 9 g of urethane-based binder having a molecular weight of 10,000 g / mol, 0.01 g of zonyl additive (Dupont), 0.2 g of ethylene glycol, 1-methyl2 0.2 grams of pyrrolidinone was prepared by mixing 25 grams of a mixed solvent of 1: 1 mixed with ethyl alcohol and isopropyl alcohol.

The surface resistance of the antistatic carrier tape fabric prepared by the above method was 10 ^6-7 ohms / area and the adhesion by ASTM D3359 method was very good at 5B, and the peel strength was 60 grams when heat sealing at 160 degrees. Similar results were obtained with 3 and visible light transmittance was 70%. The result of Example 5 shows that when the surface layer is made of a polyester resin, the adhesive strength is very excellent when forming an antistatic layer containing the conductive polymer as an active ingredient without a separate surface treatment for improving adhesion.

As in Example 1-5, it can be seen that the fabric for high-strength carrier tape can be manufactured by using the technique of the present dyeing. In addition, by mixing a dye with a special color to the material of each layer, it is possible to produce a carrier tape fabric having that color, and at the same time without a dye, the visible light transmittance is significantly improved compared to a conventional single layer material, and the carrier has high strength. Tape fabrics can be produced.

By using the technique of the present invention, the mechanical properties such as tensile strength and elongation are improved compared to the existing technology, so that the tensile strength is 400 kgf / mm ² or more, and the elongation is 30% or more, and the antistatic layer containing the conductive polymer as an active ingredient. It can be formed without a separate surface treatment, if necessary, by mixing a dye in one or more layers can be produced a high-strength carrier tape fabric for transporting electrical and electronic components having a desired color.

Claims (8)

In the carrier tape fabric of a three-layer structure manufactured by co-extrusion and each layer is made of a polymer, In the intermediate layer, a polymer having a tensile strength of 250 kgf / mm ² or more, an elongation of 5% or more and a visible light transmittance (550 nanometers) of 40% or more is used; Both surface layers have a tensile strength of 450 kgf / mm ² or more, an elongation of 100% or more, a visible light transmittance of 80% or more at 550 nanometers, and a heat-sealable cover and a good polymer; The thickness of both surface layers is 10-80% of the total thickness; And The fabric of the carrier tape is a high strength carrier tape fabric, characterized in that the tensile strength of 400 kgf / mm ² or more, elongation 30% or more, visible light transmittance of 60% or more at 550 nanometers. 2. The high strength carrier tape according to claim 1, wherein in the case where the materials of the intermediate layer and the surface layer are different from each other, 0.05-30% by weight of the polymer used in the counter layer is mixed with the surface layer or the intermediate layer material to improve the interlayer adhesion during extrusion. fabric. The high-strength carrier tape according to claim 1 or 2, wherein each layer contains 1-20% by weight of a particulate inorganic filler or a metal oxide including tin oxide and indium oxide to improve thermoformability. fabric. The high-strength carrier tape fabric according to claim 1 or 2, wherein an antistatic coating layer comprising a conductive polymer as an active ingredient is formed on the surface layer. The method according to claim 4, wherein the surface layer material is provided to enhance the wettability and adhesion of the surface layer material and the antistatic coating layer without any surface treatment. High-strength carrier tape, characterized in that the main material of the component used for the surface layer is used as an ester polymer, a carbonate polymer or a styrene polymer, or a polystyrene mixed with a styrene copolymer modified with an acrylonitrile or acrylic component. fabric. The high-strength carrier tape fabric according to claim 1 or 2, wherein a dye capable of imparting color to one or more layers of the fabric is mixed to enable color separation. According to claim 1 or 2, wherein the material of the intermediate layer is a general-purpose polystyrene, high-impact polystyrene, styrene-acrylic copolymer modified with an acrylic component, a copolymer modified with an acrylonitrile-based component, modified with a butadiene-based component A high strength carrier tape fabric comprising a styrene-based polymer comprising a copolymer, or an amorphous or semicrystalline polymer having a functional group of an ester group, an olefin group, a carbonate group, or an ether group. The high-strength carrier tape fabric according to claim 1 or 2, wherein the material of the surface layer is an ester polymer, a styrene polymer or a carbonate polymer.