Carrier tape with carbon nano-tube

Abstract

To provide a carrier tape, cover tape, or antistatic bag having improved properties.SOLUTION: A carrier tape, cover tape, or antistatic bag for transporting electronic components is comprised of 0.01% to 3% by weight of a polymer and carbon nanotubes. The carbon nanotubes can have any number of walls and diameter dimensions of any desired size below about 100 nm. The carrier tape, cover tape, or bag containing carbon nanotubes has a measured static dissipation range of 1×105 to 1×1012 Ω / sq and an optical transmittance of 60% to 90%. The carrier tape, cover tape, or bag containing carbon nanotubes reduces surface defects, high density entanglements and agglomerations. The antistatic bag containing carbon nanotubes can be formed into sheets that are manufactured into bags of desired sizes.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates generally to an antistatic package for electronic components transported by a carrier tape surrounded by a cover tape and an antistatic bag, the antistatic package being at least partially formed from carbon nanotubes. The inclusion of carbon nanotubes in the antistatic package improves the static dissipative and conductive properties of the packaged product. [Background technology]

[0002] Currently, carbon black is added to carrier tapes either uniformly throughout their thickness or as part of the top and bottom cap layers to enhance the electrical conductivity of the normally insulated materials used to form the carrier tape. The use of carbon black materials helps to reduce the build-up of static electricity along the carrier tape during transportation of electronic components. If the built-up static electricity is discharged, it can damage or destroy sensitive electronic components that are being transported in carrier tape pockets or anti-static bags.

[0003] Carrier tapes can be manufactured from extruded stock material which can be formed directly or after reheating into carrier tapes, cover tapes, or antistatic bags in a continuous process.

[0004] Current anti-static bags are formed from multiple layers laminated together with at least one foil or metallized film layer between the outer layers. The at least one foil or metallized film layer provides a conductive path that is used to divert or dissipate electrical or static electricity away from the contents of the bag to protect electrically sensitive products shipped in the bag. Dissipation of static electricity reduces static charges that could damage or destroy sensitive electronic components shipped in the anti-static bag.

[0005] The number of layers in an antistatic bag typically ranges from 3 to 5. One or more of the layers may be made of materials with different properties such as antistatic, moisture resistant, or vandal resistant. Individual layers within an antistatic bag are typically 0.0005" to 0.003" thick, with the overall thickness of the bag ranging from 0.002" to 0.008" thick. A typical three-ply bag may use a static dissipative polyester outer layer, a central foil shield, and a static dissipative polyethylene inner layer. Additional layers may include nylon or other polymers to further increase strength, moisture resistance, or antistatic properties. A five-ply bag may include two aluminum foil shields separated by a central polyester layer instead of a single foil shield.

[0006] Moisture protection may be provided within the anti-static bag when the various materials are laminated together to form the bag material. A typical construction of a cover tape includes three layers. The first layer typically consists of a biaxially oriented film that provides stiffness to the cover tape. The first layer may be formed of a polyester such as polyethylene terephthalate (PET / BO-PET). The second layer or intermediate material may be formed of polyethylene (PE), polypropylene (PP), and ethylene-vinyl acetate copolymer (EVA) and may be bonded to the first layer using a sealant layer. Other polymers / compounds may be used. The third material, the sealant, varies depending on the material used for the intermediate material. The third material is usually formed of two or more common sealant polymer components, including but not limited to ethylene-vinyl acetate copolymer (EVA), polyurethane-based resin (PU), polyethylene resin (PE), polyvinyl chloride (PVC), and the like.

[0007] [ka] Current cover tapes generally use π-electron conjugated conductive polymers, including but not limited to poly(3,4-ethylenedioxythiophene / polystyrenesulfonate) (PEDOT / PSS), poly(3-propyl-thiophene), poly(3-ethylpyrrole); fine conductive powders such as titanium oxide, zinc oxide, tin oxide, carbon black, or combinations thereof. The conjugated conductive polymer can be an additive to the base film layer to increase the conductivity of the film layer. When the cover tape is in use, this layer is coated with a heat-activated adhesive that blocks the film layer and prevents static electricity on the device side of the cover tape.

[0008] It is to be understood that any patents, publications, or other information referred to herein with respect to the art mentioned or described above is not intended to be admitted as "prior art" to the present invention.

[0009] All U.S. patents and U.S. patent applications and all other published documents mentioned in this application are incorporated herein by reference in their entirety. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] US Patent Application Publication No. 2008 / 0085405 [Non-patent literature]

[0011] [Non-Patent Document 1] Efficient coating of transparent and conductive carbon nanotube thin films on plastic substrates, MH Andrew Ng, Lysia T Hartadi, Huiwen Tan and CH Patrick Poa, published 15 April 2008, British Physical Society Press, Nanotechnology, Volume 19, No. 20 Summary of the Invention

[0012] Without limiting the scope of the invention, a brief description of some of the claimed embodiments of the invention is given below. Further details of the summarized embodiments of the invention and / or further embodiments of the invention can be found in the detailed description of the invention below.

[0013] In one embodiment, the carrier tape includes a plurality of aligned pockets, the tape and pockets carrying electronic components, and the carrier tape is formed from 0.99% to 99% by weight polymer and 0.01% to 3% by weight carbon nanotubes.

[0014] In another embodiment, the carbon nanotubes are selected from the group consisting of single-walled carbon nanotubes, double-walled carbon nanotubes, and three or more-walled carbon nanotubes, and combinations thereof.

[0015] In another alternative embodiment, in double walled carbon nanotubes and triple or higher walled carbon nanotubes, the separation between adjacent walls is between 0.20 nm and 0.34 nm. In at least one embodiment, each carbon nanotube has a diameter dimension between 1 nm and 100 nm.

[0016] In some embodiments, each carbon nanotube is 600 mm long. 2 / g~1000m 2 / g surface area. In at least one alternative embodiment, the carbon nanotubes used in the carrier tape, cover tape, or static dissipative bag have an aspect ratio of length to diameter between 3000:1 and 6000:1.

[0017] In some alternative embodiments, the carbon nanotubes are added to the polymer as raw carbon nanotube material prior to extrusion of the carrier tape or during formation of the sheet used to manufacture the static dissipative bags.

[0018] In at least one alternative embodiment, the polymer is selected from the group consisting of polycarbonate (PC), acrylonitrile butadiene styrene (ABS), polypropylene (PP), polystyrene (PS), polyethylene terephthalate (PET), high density polyethylene (HDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), styrene-acrylonitrile (SAN), polyethylene (PE), polyester (PETE), and combinations thereof.

[0019] In at least one alternative embodiment, the carrier tape, cover tape, or static dissipative bag containing carbon nanotubes has a density of 1×10 5 ~1×10 12 It has a measurement static dissipation range of Ω / sq.

[0020] In some embodiments, the carrier tape, cover tape, or static dissipative bag with carbon nanotubes has a light transmittance of 60%-90%, a haze value of 60%-70%, and / or a transparency of 25%-45%.

[0021] In some embodiments, the carrier tape, cover tape, and / or static dissipative bag containing carbon nanotubes reduces surface defects, reduces high density entanglements, and / or reduces agglomerations during the manufacturing process.

[0022] In at least one embodiment, the carrier tape, cover tape, and / or static dissipative bag containing carbon nanotubes reduces migration of the carbon material. In at least one alternative embodiment, the carrier tape includes a cover tape, the cover tape having a heat-activated or pressure-sensitive adhesive, the cover tape being formed from at least one layer, the at least one layer including a polymer and carbon nanotubes.

[0023] The use of carbon nanotubes in the heat-activated adhesive layer allows for improved static control within the carrier tape pockets, which helps reduce static build-up that can damage or destroy sensitive electronic components carried in the carrier tape pockets. Carbon nanotubes can also be used to control the surface resistivity of the base film layer and maintain the transparency of the material.

[0024] The cover tape contains carbon nanotubes (CNTs) dispersed throughout a heat-activated adhesive coating or in a base polymer film. In either case, the surface resistivity of the base film and adhesive coating can be controlled to prevent electrostatic discharge damage to static sensitive devices sealed with the cover tape in the pocket of the carrier tape. Carbon nanotubes provide consistent and repeatable surface resistivity (SR) measurements and are less affected by heating and forming cycles. Because only a small amount of CNTs are added to the substrate, the finished product is transparent. Translucent to transparent materials have the advantage of allowing the device in the pocket to be viewed during loading, transport and pick-and-place operations.

[0025] CNTs have a high aspect ratio and can control the surface resistivity at a certain level with minimal addition. Carbon nanotubes include both single-walled and multi-walled carbon nanotubes, both of which can be used as conductive additives to cover tape adhesives and backing film tapes.

[0026] CNTs can be incorporated into a variety of polymers, including, but not limited to, polyesters and polyolefins, which are common in cover tapes. The production of a coating product using CNTs can be accomplished by adding the carbon nanotubes to the coating mixture before curing, mixing to disperse, and applying. The carbon nanotubes can be mixed in various ratios depending on the percentage of CNTs in the masterbatch, which is based on the final surface resistivity desired for the heat-activated adhesive of the cover tape.

[0027] For films, the CNTs can be premixed into the final resin and fed directly into the extruder, or the carbon nanotubes can be added using a carrier material that is compatible with the base film and can be mixed with the base resin prior to extrusion.

[0028] These and other embodiments which characterize the invention are pointed out with particularity in the appended claims which form a part hereof, but for a better understanding of the invention, its advantages and objectives attained by its uses, reference should be made to the drawings which form a further part hereof and the accompanying descriptive matter in which embodiments of the invention are shown and described. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] In some embodiments, the carbon nanotube-containing carrier tape invention disclosed herein utilizes carbon nanotubes (CNTs) either dispersed throughout the carrier tape in a homogenous extrusion material or as a cap layer in a multi-layer extrusion material. Carbon nanotubes provide more consistent and reproducible surface resistivity (SR) measurements. Electrostatic dissipative materials utilizing carbon nanotubes have a surface resistivity of 1×10 5 ~1×10 12 They have surface resistivity measurements in the ohms / sq range. This level of surface resistivity reduces the possibility of damage to components due to electrostatic discharge. By using carbon nanotubes in combination with polymers, the SR measurement can be targeted and controlled to a narrower range (3 powers of 10) compared to carbon black, which has a higher SR measurement (6 powers of 10 or 10^6). The smaller particle size associated with carbon nanotubes allows for better material dispersion and more consistent density change upon stretching, so products made with carbon nanotubes are less sensitive to the heating and forming cycles used during the formation of carrier tapes.

[0030] In certain embodiments, typical carbon nanotubes exist in single-walled, double-walled, and multi-walled variations, with adjacent walls spaced apart by about 0.34 nm in the multi-walled variations, and have diameters ranging from about 1 nm to about 100 nm.

[0031] In other embodiments, smaller amounts of carbon nanotubes are used, typically about 3% or less, to provide an acceptable static dissipation range for carbon nanotubes in the size range of 1 nm to 100 nm.

[0032] In comparison to the loading of carbon nanotubes having the disclosed size range into the substrate, the amount of carbon black that would be added to the substrate to obtain a comparable surface resistivity in the manufactured product would be approximately 10-15%.

[0033] In at least one embodiment, carbon nanotubes may be incorporated into substrates formed from a variety of polymers, such as polycarbonate (PC), acrylonitrile butadiene styrene (ABS), polypropylene (PP), and polystyrene (PS), polyethylene terephthalate (PET), high density polyethylene (HDPE), low density polyethylene (LDPE), and linear low density polyethylene (LLDPE), styrene-acrylonitrile (SAN), polyethylene (PE), or polyester (PETE), along with other thermoplastic materials. The use of carbon nanotubes is not limited to use with the polymers identified above, but may also be used with other polymers or other materials, including composite materials.

[0034] In some embodiments, a small amount of CNT material is used to obtain the desired SR level, so that the finished packaging product is more transparent compared to when carbon black material is used. Current packaging materials formed with carbon black are opaque, but packaging materials formed with CNTs have a light transmittance of 60% to 90% depending on the amount of CNT used. During the use of carbon nanotube material, the haze seen in the packaging material ranges from 60% to 70%, and the transparency of the packaging material ranges from 25% to 45%. These values ​​for carrier tapes made with carbon black material are generally 0%, since the carbon black material makes the carrier tape black and opaque. The light transmittance, haze value, and transparency may vary depending on the type of substrate used in the carrier tape and its initial substrate properties.

[0035] In at least one embodiment, translucent to transparent materials for carrier tapes formed with carbon nanotubes have the advantage that they allow individuals to view electronic devices placed in the carrier tape pockets during electronic component loading, transport and pick and place operations. Translucent carrier tapes also eliminate the need for pocket holes to verify pocketed devices, reducing the likelihood of debris being trapped in the pockets, which may be formed during punching of the pocket holes.

[0036] In some embodiments, the use of carbon nanotubes instead of carbon black material improves the surface finish of the carrier tape due to reduced surface defects (gels / points, etc.) The reduction in points is related to the use of CNT material as an additive and the lower loading compared to the use of carbon black material.

[0037] In at least one embodiment, a lower percentage of additives used in forming the carrier tape or antistatic bag results in a more stable dispersion of CNTs throughout the packaging material, reducing the accumulation of dense entanglements or agglomerates. Agglomerates are a collection of nanomaterial particles, consisting of 10 to 1000 individual nanoparticles permanently drawn together. When present, they greatly increase the size of the original nanoparticles. This situation can ultimately lead to changes in intended properties, such as electrical conductivity.

[0038] In at least one embodiment, poor dispersion of the additive material into the substrate has two important consequences: a large amount of undispersed material on the surface that will conduct static discharge more easily, and voids between particles that reduce static discharge.

[0039] In some embodiments, carrier tapes formed using carbon nanotubes have less migration (peeling) of the carbon material compared to carbon black based materials due to the lower additive content and smaller particle size. Carbon black entangles to form a relatively large surface area, which makes it more likely to be scraped off and migrate (peeled off) onto the surface of the device or material that is in contact with the carbon black surface area in the carrier tape pocket. Typical carbon black does not exist as individual primary particles, but rather multiple particles bond together to form aggregates with a common size of 50 μm to 500 μm. CNT materials, on the other hand, range in size from 1 nm to 100 nm.

[0040] In some embodiments, carbon nanotubes have a higher aspect ratio (length / diameter ratio of 3000:1 to 6000:1) compared to carbon black (which is aggregated and has an irregular shape), so CNTs have more exposed surface per volume, making them more effective conductors. Aspect ratio is the ratio of length to diameter. The higher the aspect ratio of CNTs, the higher the surface area percentage compared to carbon black material. Carbon black also typically has overlapping aggregates, which further reduces the effective surface area of ​​carbon black. The surface area of ​​CNTs is 600 m 2 / g~1000m 2 / g range, whereas carbon black is in the 50m 2 / g~150m 2 / g range. Compared to carrier tapes formed using carbon black materials, carrier tapes formed using CNTs are more effective conductors.

[0041] In many embodiments, carbon nanotubes, including both single-walled and multi-walled carbon nanotubes, may be utilized as a conductive additive to the carrier tape.

[0042] In some embodiments, the manufacture of carrier tapes from extruded products / polymers with carbon nanotubes can be accomplished by adding the carbon nanotubes in a pelletized state to the extruder. This uses a polymer separate from the carrier tape material, and the amount of CNTs is provided ranging from 0.01% up to 3% by weight for both single-walled and multi-walled CNTs. The carbon nanotubes and polymer carrier can be mixed in various ratios from 0.01% up to 3% with thermoplastic materials such as LLDPE, PET, SAN, ABS, as mentioned herein, or equivalents of these materials, depending on the target surface resistivity desired for the masterbatch. The target surface resistivity desired for the masterbatch is based on the final surface resistivity desired for the carrier tape. It is also possible to pre-compound the carbon nanotubes into the final resin that can be fed directly into the extruder. This is done by mixing the CNTs with the desired thermoplastic resin in the extruder and pelletizing the extruded product.

[0043] In at least one embodiment, the carrier tape may utilize carbon nanotubes integrated with the carrier tape for static dissipative or conductive properties. The carrier tape containing carbon nanotubes can be formed by extruding a resin containing CNTs into a sheet. The sheet can then be reheated in a thermoforming operation using heating methods such as contact heating, IR heating, or convection heating, and then pockets can be formed by embossing, pneumatic or vacuum forming using a forming tool and die. The sheet with CNTs can also be extruded and cast directly onto a die to then form a carrier tape incorporating carbon nanotubes. These methods utilize carbon nanotubes ranging from 0.015% up to about 3%.

[0044] In some embodiments, the carbon nanotubes may be added in raw form during the extrusion process or as a pre-formulated concentrated additive. Alternatively, the carbon nanotubes may be blended with other polymers by a resin supplier for direct feeding into the extruder during the manufacturing process. After extrusion, the resin containing the CNTs may be dispersed throughout the carrier tape material or may be integrated with a specific layer for use in a combination of layers within a multi-layer product.

[0045] The target surface resistivity of the carrier tape containing carbon nanotubes is generally 1×10 5 ~1×10 12 The range of Ω / sq, known as the electrostatic dissipation range defined by national standard ANSI / ESD-S541, is where the carbon nanotube levels are adjusted to meet the target values ​​in the final product.

[0046] In another embodiment, the anti-static bag utilizes carbon nanotubes (CNTs) that are either dispersed as a uniform material throughout the bag or incorporated into one or more individual layers that can be stacked together to form a multi-layer laminate material. The total number of layers in an anti-static bag typically ranges from 3-5, with inner and outer static dissipative layers and foil layers disposed between or within the static dissipative layers.

[0047] Carbon nanotubes provide more stable and repeatable surface resistivity (SR) measurements and are less affected by heating and processing cycles during the manufacture of laminated bag materials used as part of antistatic bags. Smaller amounts of CNTs (typically less than 3% CNTs compared to 10-15% for carbon black materials) are added to the substrate resin for use in the outer layer of the antistatic bag. The substrate typically uses polyester or polyethylene, but can be made from other polymers mixed with static dissipative compounds such as carbon nanotubes to have static dissipative properties. A CNT loaded inner layer may be used to replace the inner foil layer, thereby making the antistatic bag more transparent or translucent. Translucent to transparent materials used in antistatic bags provide the advantage of allowing visual observation of the contents placed inside during transport while the antistatic bag is in use, allowing individuals to read the labels located inside the antistatic bag. In some embodiments, an inner barcode placed inside the antistatic bag using CNTs can be viewed.

[0048] In some embodiments, carbon nanotubes offer a higher aspect ratio (length / diameter ratio of 3000:1 to 6000:1) compared to carbon black (which is aggregated and has an irregular shape), so CNTs have more exposed surface per volume, making materials incorporating CNTs more effective conductors. Aspect ratio is the ratio of length to diameter. The higher the aspect ratio of CNTs, the higher the surface area percentage compared to carbon black. Carbon black also typically has overlapping aggregates, which further reduces the effective surface area of ​​carbon black. CNTs have a surface area of ​​600 to 1000 m 2 / g range, whereas carbon black is in the 50m 2 / g~150m 2 / g. Thus, multi-layer materials used in carrier tapes and anti-static bags formed with CNTs are more effective conductors compared to carbon black materials. Carbon nanotubes, including both single-walled and multi-walled carbon nanotubes, can be used as the conductive component in the individual polymer layers that are stacked together to form anti-static bags and carrier tapes.

[0049] In some embodiments, making extruded or blown antistatic bags with CNTs can be accomplished by adding the carbon nanotubes in pellets to an extruder using another or different polymer as a carrier. The carbon nanotubes can be mixed in various ratios depending on the percentage of CNTs in the masterbatch, which is based on the final surface resistivity desired for the antistatic bag, cover tape, or carrier tape. It is also possible to pre-compound the CNTs into the final resin that can be fed directly into the extruder during the formation of the antistatic bag, cover tape, or carrier tape.

[0050] Antistatic bags may utilize carbon nanotubes within the layers of material forming the bag to provide static dissipative or conductive properties. Carbon nanotubes may be incorporated into either blown films or extruded sheets that can be used as homogenous or multi-layer laminate bag materials during extrusion. Carbon nanotubes may be added in raw form during extrusion or as a pre-formulated concentrated additive.

[0051] Antistatic bags may be utilized to protect individually packaged sensitive components, electronic components and devices, or multiple components or devices in bulk containers, tape and reel packages, tray packages or other packages. The size of the antistatic bag may be closely matched to the size of the item being packaged. The antistatic bag may be vacuum sealed to remove air before the item is placed inside and heat sealed for shipping. Alternatively, the antistatic bag may be sealed by mechanical or adhesive means. Alternatively, the air may be replaced with an inert gas before sealing the antistatic bag to reduce the possibility of corrosion that may result from condensation due to exposure to temperature changes.

[0052] In some embodiments, the target surface resistivity of the CNT-based material is typically 1×10 5 ~1×10 10 The surface resistivity ranges from Ω / sq, and the amount of CNTs is adjusted to meet the target surface resistivity of the final product.

[0053] The cover tape can utilize carbon nanotubes to enhance the static dissipative or conductive properties of the heat-activated adhesive by mixing the carbon nanotubes into the adhesive and coating the base film, or as a premixed carrier material that is mixed with the heat-activated adhesive prior to coating.

[0054] The base film of the cover tape can be formed with the carbon nanotubes premixed with an affinity carrier which can be supplied along with the base material, or the carbon nanotubes can be compounded directly into the extruder during the formation of the base film.

[0055] The cover tape sealant material may be directly mixed, premixed, or directly compounded with the carbon nanotubes. The target surface resistivity is generally 1×10 5 ~1×10 10 The range is Ω / sq, and the amount of CNTs is adjusted to meet the target values ​​for the final product.

[0056] Working Example Example 1: A carrier tape having aligned pockets was formed according to the following conditions: Carbon nanotubes are single-walled and each have a diameter dimension of about 20 nm; The surface area of ​​a carbon nanotube is 750 m 2 / g; Carbon nanotubes have an aspect ratio of 450:1; Carbon nanotubes were added as raw material to the substrate before extrusion; The carbon nanotubes constituted approximately 0.1% by weight of the material of the formed carrier tape; The substrates comprised the following weight percentages of the formed carrier tapes: Polycarbonate (PC) (99.90%); The surface resistivity of the formed carrier tape is 1×10 12 was Ω / sq; The light transmittance of the formed carrier tape was 80%; The haze value of the formed carrier tape was 50.5%; The transparency of the formed carrier tape was 26%; The surface defects (such as points) of the formed carrier tape were reduced to a value of 0%; The measured value of high density entanglement or agglomerate accumulation in the formed carrier tape was reduced to a value of 0%; The measured carbon material migration (delamination) of the formed carrier tape was reduced to a value of 0%.

[0057] Example 2: A carrier tape having aligned pockets was formed according to the following conditions: The carbon nanotubes are double-walled or multi-walled, with the spacing between the layers being about 0.3 nm; The diameter of each carbon nanotube is about 50 nm; The surface area of ​​a carbon nanotube is 600 m 2 / g; Carbon nanotubes have an aspect ratio of 3000:1; Carbon nanotubes were added to the substrate as a concentrated additive that was precompounded prior to extrusion; The pre-compounded resin with carbon nanotubes constituted approximately 2.5% by weight of the material of the formed carrier tape; The carbon nanotubes constituted approximately 0.25% by weight of the material of the formed carrier tape; The substrates comprised the following weight percentages of the formed carrier tapes: Polycarbonate (PC) (97.5%); The surface resistivity of the formed carrier tape is 1×10 8 was Ω / sq; The light transmittance of the formed carrier tape was 10%; The surface defects (such as points) of the formed carrier tape were reduced to a value of 0%; The measured value of high density entanglement or agglomerate accumulation in the formed carrier tape was reduced to a value of 0%; The measured carbon material migration (delamination) of the formed carrier tape was reduced to a value of 0%.

[0058] Example 3: A carrier tape having aligned pockets was formed according to the following conditions: Carbon nanotubes are single-walled and each have a diameter dimension of about 10 nm; The surface area of ​​a carbon nanotube is 850 m 2 / g; Carbon nanotubes have an aspect ratio of 5500:1; Carbon nanotubes were added as raw material to the substrate before extrusion; The carbon nanotubes constituted approximately 0.2% by weight of the material of the formed carrier tape; The substrates comprised the following weight percentages of the formed carrier tapes: Linear low density polyethylene (LLDPE) (19.8%); Acrylonitrile butadiene styrene (ABS) (80%); The surface resistivity of the formed carrier tape is 1×10 10 was Ω / sq; The light transmittance of the formed carrier tape was 84%; The haze value of the formed carrier tape was 59.5%; The transparency of the formed carrier tape was 26%; The surface defects (such as points) of the formed carrier tape were reduced to a value of 0%; The measured value of high density entanglement or agglomerate accumulation in the formed carrier tape was reduced to a value of 0%; The measured carbon material migration (delamination) of the formed carrier tape was reduced to a value of 0%.

[0059] Example 4: A carrier tape having aligned pockets was formed according to the following conditions: The carbon nanotubes are single-walled and each have a diameter dimension of about 60 nm; The surface area of ​​a carbon nanotube is 750 m 2 / g; Carbon nanotubes have an aspect ratio of 6000:1; Carbon nanotubes were added as raw material to the substrate before extrusion; The carbon nanotubes constituted approximately 0.25% by weight of the material of the formed carrier tape; The substrates comprised the following weight percentages of the formed carrier tapes: Linear low density polyethylene (LLDPE) (19.75%); Styrene-acrylonitrile (SAN) (80%); The surface resistivity of the formed carrier tape is 1×10 11 was Ω / sq; The light transmittance of the formed carrier tape was 81%; The haze value of the formed carrier tape was 69.5%; The transparency of the formed carrier tape was 34%; The surface defects (such as points) of the formed carrier tape were reduced to a value of 0%; The measured value of high density entanglement or agglomerate accumulation in the formed carrier tape was reduced to a value of 0%; The measured carbon material migration (delamination) of the formed carrier tape was reduced to a value of 0%.

[0060] Example 5: A static dissipative carrier bag was formed according to the following: The carbon nanotubes are single-walled and each have a diameter dimension of about 23 nm; The average surface area of ​​a carbon nanotube is 750m 2 / g; Carbon nanotubes have an aspect ratio of 4500:1; Carbon nanotubes were added as a raw material to the substrate before extrusion into sheets; Carbon nanotubes constituted approximately 0.2% of the material in the formed dissipative bags; The substrates comprised the following proportions of the formed static dissipative carrier bags: Linear low density polyethylene (LLDPE) (99.80%); The surface resistivity of the formed static dissipative carrier bag is 1×10 10 It was Ω / sq.

[0061] The light transmittance of the formed static dissipative carrier bag was 80%; The haze value of the formed static dissipative carrier bag was 80%; The transparency of the formed static dissipative carrier bag was 54%; The surface defects of the formed static dissipative carrier bag (e.g., nibs) were reduced to a value of 0%; The measured accumulation of dense entanglements or agglomerates in the formed static dissipative carrier bags was reduced to a value of 0%; The measured carbon material migration (delamination) of the formed static dissipative carrier bag was reduced to a value of 0%.

[0062] Example 6: A static dissipative carrier bag was formed according to the following: Carbon nanotubes are multi-walled, with the spacing between layers being approximately 0.34 nm; The diameter of each carbon nanotube is about 45 nm; The average surface area of ​​a carbon nanotube is 1000m 2 / g; Carbon nanotubes have an aspect ratio of 3000:1; The carbon nanotubes were added to the substrate as a pre-formulated concentrated additive prior to blow molding the static dissipative carrier bags; The carbon nanotubes comprised approximately 2.0% of the material of the blow molded static dissipative carrier bag.

[0063] The substrates comprised the following proportions of the blow molded static dissipative carrier bags: Polyethylene terephthalate (PET) (48.00%); Linear low density polyethylene (LLDPE) (50%); Blow molded static dissipative carrier bags have a surface resistivity of 1×10 10 was Ω / sq; The light transmittance of the blow molded static dissipative carrier bag was 60%; The haze value of the blow molded static dissipative carrier bag was 60%; The transparency of the blow molded static dissipative carrier bag was 30%; Surface defects (such as nibs) on the blow molded static dissipative carrier bags were reduced to a value of 0%.

[0064] Measurements of high density entanglement or agglomerate buildup in blow molded static dissipative carrier bags were reduced to a value of 0%; The measured carbon material migration (delamination) of the blow molded static dissipative carrier bags was reduced to a value of 0%.

[0065] Example 7: A static dissipative carrier bag was formed according to the following: Carbon nanotubes are single-walled and each have a diameter dimension of about 20 nm; The average surface area of ​​a carbon nanotube is 850m 2 / g; Carbon nanotubes have an aspect ratio of 5500:1; Carbon nanotubes were added as a raw material to the substrate before extrusion into sheets; The carbon nanotubes constituted approximately 0.3% of the material in the formed antistatic cover tape.

[0066] The substrates comprised the following proportions of the formed static dissipative carrier bags: Biaxially oriented polyethylene terephthalate (BO-PET) (39.85%); The intermediate materials comprised the following percentages of the formed static dissipative carrier bags: Ethylene-vinyl acetate copolymer (EVA) (40.00%); The sealant materials comprised the following percentages of the formed static dissipative carrier bags: Ethylene-vinyl acetate copolymer (EVA) + polyurethane resin (PU) + polyethylene resin (PE) (39.85%); The surface resistivity of the formed static dissipative carrier bag is 1×10 10 was Ω / sq; The light transmittance of the formed carrier tape was 74%; The haze value of the formed carrier tape was 60.5%; The transparency of the formed carrier tape was 20%.

[0067] Example 8: A static dissipative carrier bag was formed according to the following: The carbon nanotubes are single-walled and each have a diameter dimension of about 25 nm; The average surface area of ​​a carbon nanotube is 900m 2 / g; Carbon nanotubes have an aspect ratio of 5000:1; Carbon nanotubes were added as a raw material to the substrate before extrusion into sheets; The carbon nanotubes constituted approximately 0.4% of the material in the formed antistatic cover tape.

[0068] The substrates comprised the following proportions of the formed static dissipative carrier bags: Biaxially oriented polyethylene terephthalate (BO-PET) (39.80%); The intermediate materials comprised the following percentages of the formed static dissipative carrier bags: Polypropylene (PP) (40.00%); The sealant materials comprised the following percentages of the formed static dissipative carrier bags: Polypropylene (PP), polyurethane resin (PU), polyethylene resin (PE) (39.85%); The surface resistivity of the formed static dissipative carrier bag is 1×10 9 was Ω / sq; The light transmittance of the formed carrier tape was 84%; The haze value of the formed carrier tape was 60.5%; The transparency of the formed carrier tape was 20%.

[0069] In a first alternative embodiment, the carrier tape includes a plurality of aligned pockets, the pockets constructed and arranged for transporting electronic components, the carrier tape being formed from a plurality of materials, the plurality of materials including a polymer and carbon nanotubes, the polymer comprising 0.99% to 99% by weight of the plurality of materials, and the carbon nanotubes comprising 0.01% to 3% by weight of the plurality of materials.

[0070] In a second alternative embodiment, the carbon nanotubes in the first alternative embodiment are selected from the group consisting of single-walled carbon nanotubes, double-walled carbon nanotubes, and triple- or multi-walled carbon nanotubes, and combinations thereof.

[0071] In a third alternative embodiment, in the double-walled carbon nanotubes and triple-walled or multi-walled carbon nanotubes of the second alternative embodiment, the separation distance between adjacent layers is 0.20 nm to 0.34 nm.

[0072] In a fourth alternative embodiment, the carbon nanotubes in the second alternative embodiment each have a diameter dimension between 1 nm and 100 nm. In a fifth alternative embodiment, the carbon nanotubes in the second alternative embodiment are each 600 m 2 / g~1000m 2 / g surface area.

[0073] In a sixth alternative embodiment, the carbon nanotubes in the second alternative embodiment have an aspect ratio of 3000:1 to 6000:1. In a seventh alternative embodiment, the carbon nanotubes of the first alternative embodiment are added to a polymer as raw carbon nanotube material prior to extrusion of the carrier tape, cover tape, or static dissipative bag.

[0074] In an eighth alternative embodiment, the polymer in the first alternative embodiment is selected from the group consisting of polycarbonate (PC), acrylonitrile butadiene styrene (ABS), polypropylene (PP), polystyrene (PS), polyethylene terephthalate (PET), high density polyethylene (HDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), styrene-acrylonitrile (SAN), polyethylene (PE), polyester (PETE), and combinations thereof.

[0075] In a ninth alternative embodiment, the carrier tape in the first alternative embodiment is 1×10 5 ~1×10 12 It has a measurement static dissipation range of Ω / sq. In a tenth alternative embodiment, the carrier tape in the second alternative embodiment has a light transmittance of 60% to 90%.

[0076] In an eleventh alternative embodiment, the carrier tape in the tenth alternative embodiment has a haze value of 60% to 70%. In a twelfth alternative embodiment, the carrier tape in the eleventh alternative embodiment has a transparency of 25% to 45%.

[0077] In a thirteenth alternative embodiment, the carrier tape in the second alternative embodiment has a surface defect measurement of 10% or less. In a fourteenth alternative embodiment, the carrier tape of the second alternative embodiment has a high density entanglement measurement of 5% or less.

[0078] In a fifteenth alternative embodiment, the carrier tape of the second alternative embodiment has a conglomerate measurement of 5% or less. In a sixteenth alternative embodiment, the carrier tape in the second alternative embodiment has a measured carbon material migration (delamination) of 1% or less.

[0079] In a seventeenth alternative embodiment, the carrier tape in the first alternative embodiment further includes a cover tape, the cover tape having a heat-activated adhesive or a pressure-sensitive adhesive, and the cover tape having at least one layer formed from a polymer and carbon nanotubes.

[0080] In an eighteenth alternative embodiment, the cover tape is formed from an elongated tape portion, the elongated tape portion being formed from a plurality of materials, the plurality of materials including a polymer and carbon nanotubes, the polymer comprising 0.99% to 99% by weight of the plurality of materials, and the carbon nanotubes comprising 0.01% to 3% by weight of the plurality of materials, and the elongated tape portion being configured and arranged to be bonded to a carrier tape via thermal activation or pressure activation.

[0081] In a nineteenth alternative embodiment, an antistatic bag is formed from a plurality of layers, the plurality of layers being stacked and bonded together, the antistatic bag being constructed and arranged for transporting electronic components, at least one of the plurality of layers being formed from a plurality of materials, the plurality of materials including a polymer and carbon nanotubes, the polymer comprising 0.99% to 99% by weight of the plurality of materials, and the carbon nanotubes comprising 0.01% to 3% by weight of the plurality of materials.

[0082] US Patent Application Publication No. 2008 / 0085405 is incorporated herein by reference in its entirety. The publications identified below are also incorporated herein by reference in their entireties.

[0083] Efficient coating of transparent and conductive carbon nanotube thin films on plastic substrates, MH Andrew Ng, Lysia T Hartadi, Huiwen Tan and CH Patrick Poa, Published 15 April 2008, British Physical Society Press, Nanotechnology, Vol. 19, No. 20.

[0084] While the preferred and alternative embodiments of the present invention have been described above, those skilled in the art may recognize other equivalents to the specific embodiments described herein which equivalents are intended to be encompassed by the appended claims.

[0085] The above disclosure is intended to be illustrative and not exhaustive. Many modifications and alternatives will be suggested to those skilled in the art by this description. The various elements shown in the individual figures and described above can be combined and modified for combination as desired. All of these alternatives and modifications are intended to be included within the scope of the claims, and in the claims, the term "including" means "including but not limited to."

[0086] These and other embodiments which characterize the invention are pointed out with particularity in the appended claims which form a part hereof, but for a better understanding of the invention, and its advantages and objects attained by its uses, reference should be made to the drawings which form a further part hereof, and the accompanying descriptive matter in which embodiments of the invention are shown and described.

Claims

1. A carrier tape comprising a plurality of aligned pockets, the pockets constructed and arranged for transporting electronic components, the carrier tape being formed from a plurality of materials, the plurality of materials being free of carbon black and including a polymer and carbon nanotubes, the polymer comprising 0.99% to 99% by weight of the plurality of materials, the carbon nanotubes comprising 0.01% to 1% by weight of the plurality of materials and mixed into a substrate of the carrier tape, the carbon nanotubes being selected from the group consisting of single-walled carbon nanotubes, double-walled carbon nanotubes, triple-walled carbon nanotubes, multi-walled carbon nanotubes, and combinations thereof, the double-walled carbon nanotubes, the triple-walled carbon nanotubes, and the multi-walled carbon nanotubes having a separation distance between adjacent layers of the double-walled carbon nanotubes, the triple-walled carbon nanotubes, and the multi-walled carbon nanotubes being 0.20 nm to 0.34 nm, and the carbon nanotubes each having a length of 600 m. ２ / g to 1000m ２ / g of surface area.

2. 2. The carrier tape of claim 1, wherein the carbon nanotubes each have a diameter dimension between 1 nm and 100 nm.

3. The carrier tape of claim 2 , wherein the carbon nanotubes have an aspect ratio of 3000:1 to 6000:

1.

4. 4. The carrier tape of claim 3, wherein the carbon nanotubes are added as raw carbon nanotubes or pre-dispersed in the polymer prior to forming of the carrier tape.

5. 5. The carrier tape of claim 4, wherein the polymer is selected from the group consisting of polycarbonate (PC), acrylonitrile butadiene styrene (ABS), polypropylene (PP), polystyrene (PS), polyethylene terephthalate (PET), high density polyethylene (HDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), styrene-acrylonitrile (SAN), polyethylene (PE), polyester (PETE), and combinations thereof.

6. 1x10 ５ ~1×10 １２ 6. The carrier tape of claim 5 having a surface resistivity in the range of ohms / sq.

7. The carrier tape of claim 6 having a light transmittance of 60% to 90%.

8. The carrier tape of claim 7 having a haze value of 60% to 70%.

9. The carrier tape of claim 8 having a transparency of 25% to 45%.

10. 1. A packaging material for transporting electronic components, comprising: a carrier tape having a plurality of aligned pockets, the pockets constructed and arranged for transporting the electronic components, the carrier tape being formed from a plurality of materials, the plurality of materials including a polymer and carbon nanotubes, the polymer comprising 0.99% to 99% by weight of the plurality of materials, the carbon nanotubes comprising 0.01% to 1% by weight of the plurality of materials, the carbon nanotubes having an aspect ratio of 3000:1 to 6000:1, the carbon nanotubes being selected from the group consisting of single-walled carbon nanotubes, double-walled carbon nanotubes, triple-walled carbon nanotubes, multi-walled carbon nanotubes, and combinations thereof, a separation distance between adjacent layers of the double-walled carbon nanotubes, the triple-walled carbon nanotubes, and the multi-walled carbon nanotubes being 0.20 nm to 0.34 nm, and the carbon nanotubes each having a length of 600 mm or more. ２ / g to 1000m ２ / g surface area, and said carbon nanotubes each have a diameter dimension of 1 nm to 100 nm.

11. 11. The packaging material of claim 10, wherein the polymer is selected from the group consisting of polycarbonate (PC), acrylonitrile butadiene styrene (ABS), polystyrene (PS), styrene-acrylonitrile (SAN), and combinations thereof.

12. 12. The packaging material of claim 11, wherein the carbon nanotubes are added as raw carbon nanotubes or pre-dispersed in the polymer prior to forming the carrier tape.

13. The carrier tape is 1×10 ５ ~1×10 １２ 13. The packaging material of claim 12 having a surface resistivity in the range of ohms / sq.

14. The packaging material of claim 13, wherein the carrier tape has a light transmittance of 60% to 90%.

15. The packaging material of claim 14, wherein the carrier tape has a haze value of 60% to 70%.

16. The packaging material of claim 15, wherein the carrier tape has a transparency of 25% to 45%.

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