WO2012169387A1 - カバーフィルム - Google Patents
カバーフィルム Download PDFInfo
- Publication number
- WO2012169387A1 WO2012169387A1 PCT/JP2012/063766 JP2012063766W WO2012169387A1 WO 2012169387 A1 WO2012169387 A1 WO 2012169387A1 JP 2012063766 W JP2012063766 W JP 2012063766W WO 2012169387 A1 WO2012169387 A1 WO 2012169387A1
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- WIPO (PCT)
- Prior art keywords
- layer
- cover film
- intermediate layer
- heat seal
- carrier tape
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D43/00—Lids or covers for rigid or semi-rigid containers
- B65D43/02—Removable lids or covers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
- B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/302—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising aromatic vinyl (co)polymers, e.g. styrenic (co)polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
- B32B27/327—Layered products comprising a layer of synthetic resin comprising polyolefins comprising polyolefins obtained by a metallocene or single-site catalyst
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/06—Interconnection of layers permitting easy separation
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K13/00—Apparatus or processes specially adapted for manufacturing or adjusting assemblages of electric components
- H05K13/0084—Containers and magazines for components, e.g. tube-like magazines
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2250/00—Layers arrangement
- B32B2250/24—All layers being polymeric
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
- B32B2264/10—Inorganic particles
- B32B2264/102—Oxide or hydroxide
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
- B32B2307/202—Conductive
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/30—Properties of the layers or laminate having particular thermal properties
- B32B2307/31—Heat sealable
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/514—Oriented
- B32B2307/518—Oriented bi-axially
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/50—Properties of the layers or laminate having particular mechanical properties
- B32B2307/582—Tearability
- B32B2307/5825—Tear resistant
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/748—Releasability
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2435/00—Closures, end caps, stoppers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2435/00—Closures, end caps, stoppers
- B32B2435/02—Closures, end caps, stoppers for containers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2439/00—Containers; Receptacles
- B32B2439/40—Closed containers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2553/00—Packaging equipment or accessories not otherwise provided for
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/14—Layer or component removable to expose adhesive
- Y10T428/1405—Capsule or particulate matter containing [e.g., sphere, flake, microballoon, etc.]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/14—Layer or component removable to expose adhesive
- Y10T428/1452—Polymer derived only from ethylenically unsaturated monomer
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/28—Web or sheet containing structurally defined element or component and having an adhesive outermost layer
- Y10T428/2813—Heat or solvent activated or sealable
- Y10T428/2817—Heat sealable
- Y10T428/2826—Synthetic resin or polymer
Definitions
- the present invention relates to a cover film used for a package of electronic parts.
- Such surface mounting electronic components are stored in a carrier tape in which storage pockets embossed to match the shape of the electronic component are continuously formed.
- a cover film is stacked as a cover material on the upper surface of the carrier tape, and both ends of the cover film are continuously heat-sealed in the length direction with a heated seal bar or the like to form a package of electronic parts Yes.
- a cover film material a material in which a biaxially stretched polyester film is used as a base material and a heat seal layer of a thermoplastic resin is laminated is used.
- the cover film when heat-sealed to a plastic carrier tape such as polystyrene or polycarbonate, the cover film has an appropriate peel strength and has a sufficiently small variation in the peel strength so that the tape does not break due to an impact due to high-speed peel. It is an issue to provide.
- the present invention comprises at least a base layer (A), an intermediate layer (B), and a heat seal layer (C) having a thermoplastic resin that can be heat sealed to a carrier tape, and the intermediate layer
- the present invention relates to a cover film characterized in that (B) contains a metallocene linear low-density polyethylene, and the softening temperature of the metallocene linear low-density polyethylene according to TMA method according to JIS K7196 is 98 to 109 ° C.
- the cover film has a release layer (D) between the intermediate layer (B) and the heat seal layer (C), and a conductive material is provided in either the heat seal layer (C) or the release layer (D). It is preferable to contain.
- the release layer (D) has an aromatic vinyl group content of 15 to 35% by mass when the total resin is 100% by mass, and a density of 0.890 to 0.935 ⁇ 10 3 (kg / m 3). And a hydrogenated resin of an aromatic vinyl-conjugated diene copolymer.
- the conductive material is conductive fine particles, and the shape is preferably either needle-shaped or spherical fine particles, or a combination thereof.
- the present invention also relates to an electronic component package using the cover film as a cover material for a carrier tape made of a thermoplastic resin.
- the cover film of the present invention is excellent in heat sealability for plastic carrier tapes such as polystyrene and polycarbonate, and when the cover film is peeled off, there is little variation in peel strength, and the tape breaks due to impact due to high speed peeling. Does not happen.
- the cover film of this invention has at least a base material layer (A), an intermediate
- An example of the laminated structure of the cover film of the present invention is shown in FIG.
- the cover film 1 includes a base material layer 2, an intermediate layer 4 laminated on the base material layer 2 via an anchor coat layer 3, a release layer 5 laminated on the intermediate layer 4 in order, and It has a laminated structure with a heat seal layer 6.
- each layer will be described in detail.
- the base material layer (A) is a layer made of biaxially stretched polyester or biaxially stretched nylon, biaxially stretched polyethylene terephthalate (PET), biaxially stretched polyethylene naphthalate (PEN), biaxially stretched 6,6 -Nylon and 6-nylon can be particularly preferably used.
- PET biaxially stretched polyethylene terephthalate
- PEN biaxially stretched polyethylene naphthalate
- 6,6 -Nylon biaxially stretched 6,6 -Nylon and 6-nylon
- an antistatic agent for antistatic treatment was applied or kneaded. Those subjected to corona treatment or easy adhesion treatment can be used.
- the base material layer (A) is too thin, the tensile strength of the cover film itself will be low, and therefore, when the cover film is peeled off, “breakage of the film” is likely to occur.
- it is too thick, not only the heat sealability with respect to the carrier tape will be lowered, but also the cost will be increased, so that a thickness of 12 to 25 ⁇ m can be suitably used.
- middle layer (B) is laminated
- a linear low density polyethylene hereinafter referred to as LLDPE
- LLDPE linear low density polyethylene
- the intermediate layer resin from the edge of the cover film due to heat and pressure during heat sealing
- the cover film not only prevents the iron from sticking out when heat-sealing, but also softens the intermediate layer when the cover film is heat-sealed. It is easy to obtain a stable peel strength when peeling.
- the intermediate layer (B) is formed of m-LLDPE.
- the m-LLDPE of the intermediate layer (B) one having a softening temperature of 98 to 110 ° C. in the TMA method according to JIS K7196 is selected. If the temperature is lower than 98 ° C., the intermediate layer (B) cannot absorb the impact at the time of high-speed peeling and the frequency of film breakage increases. If the temperature is higher than 110 ° C., the intermediate layer (B) is not sufficiently softened during heat sealing and stable peeling. Strength cannot be obtained.
- M-LLDPE having the above softening temperature is commercially available, and is an ⁇ -olefin substituted with an olefin having 3 or more carbon atoms, preferably a linear, branched or aromatic nucleus having 3 to 18 carbon atoms as a comonomer.
- a copolymer of olefin and ethylene examples include propylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-nonene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, -Octadecene and the like.
- branched monoolefin examples include 3-methyl-1-butene, 3-methyl-1-pentene, 4-methyl-1-pentene, 2-ethyl-1-hexene and the like.
- styrene etc. are mentioned as a monoolefin substituted by the aromatic nucleus.
- These comonomers can be copolymerized with ethylene singly or in combination of two or more.
- polyenes such as butadiene, isoprene, 1,3-hexadiene, dicyclopentadiene, and 5-ethylidene-2-norbornene may be copolymerized.
- the thickness of the intermediate layer (B) is generally 5 to 50 ⁇ m, preferably 10 to 40 ⁇ m. If the thickness of the intermediate layer (B) is less than 5 ⁇ m, the adhesive strength between the base material layer (A) and the intermediate layer (B) may be insufficient, and heat at the time of heat sealing the cover film to the carrier tape In some cases, the effect of relieving the spots on the seal iron cannot be obtained. On the other hand, if the thickness exceeds 50 ⁇ m, the total thickness of the cover film is so thick that it may be difficult to obtain sufficient peel strength when the cover film is heat sealed to the carrier tape.
- the cover film of the present invention has a heat seal layer (C) on the surface of the intermediate layer (B).
- the thermoplastic resin for the heat seal layer (C) include acrylic resins, polyester resins, styrene resins, and ethylene-vinyl acetate copolymer resins. Among them, acrylic resin is extremely excellent in heat sealability with respect to polystyrene, polycarbonate and the like which are materials constituting the carrier tape. In particular, the use of a resin having a glass transition temperature in the range of 45 to 80 ° C. is preferable from the viewpoint of obtaining a stable peel strength, and an acrylic resin having a temperature of 50 to 75 ° C. is more preferable.
- acrylic resin constituting the heat seal layer (C) examples include acrylic acid esters such as methyl acrylate, ethyl acrylate, propyl acrylate, and butyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, and methacrylic acid.
- Resins containing 50% by mass or more of at least one acrylic residue such as methacrylic acid esters such as butyl and cyclohexyl methacrylate can be used, and a resin obtained by copolymerizing two or more of these may be used.
- the thickness of the heat seal layer (C) is in the range of 0.1 to 5 ⁇ m, preferably 0.1 to 3 ⁇ m, more preferably 0.1 to 0.5 ⁇ m.
- the thickness of the heat seal layer is less than 0.1 ⁇ m, the heat seal layer (C) may not exhibit sufficient peel strength.
- the thickness of the heat seal layer exceeds 5 ⁇ m, not only the cost increases, but also there is a possibility that the peel strength varies when the cover film is peeled off.
- the cover film of the present invention is a thermoplastic resin release layer (D) between the intermediate layer (B) and the heat seal layer (C) for the purpose of reducing the range when peeling the cover film from the carrier tape.
- the thermoplastic resin used for the release layer (D) is preferably a hydrogenated resin of an aromatic vinyl-conjugated diene copolymer having an aromatic vinyl group content of 15 to 35% by mass.
- the resin density of the release layer (D) is preferably in the range of 0.890 to 0.935 ⁇ 10 3 (kg / m 3 ), and the mass average molecular weight is between 50,000 and 200,000. If it is out of the range, the peel strength may be difficult to obtain, and the range at the time of peeling may be increased.
- the thickness of the release layer (D) is usually in the range of 0.1 to 3 ⁇ m, preferably 0.1 to 1.5 ⁇ m. When the thickness of the release layer (D) is less than 0.1 ⁇ m, sufficient peel strength may not be exhibited when the carrier tape is heat sealed to the cover film. On the other hand, when the thickness of the release layer (D) exceeds 3 ⁇ m, the peel strength may vary when the cover film is peeled off. As will be described later, the release layer (D) and the heat seal layer (C) are usually formed by coating. The “thickness” when formed by the coating method is the thickness after drying.
- the release layer (D) or the heat seal layer (C) can contain at least one of conductive tin oxide particles, conductive zinc oxide particles, and conductive titanium oxide particles as a conductive material as a conductive material.
- conductive tin oxide particles, conductive zinc oxide particles, and conductive titanium oxide particles can be spherical or needle-shaped. In particular, when acicular tin oxide doped with antimony is used, a cover film having particularly good antistatic performance can be obtained.
- the addition amount is usually 100 to 1000 parts by mass, preferably 200 to 800 parts by mass, with respect to 100 parts by mass of the thermoplastic resin constituting the release layer (D).
- the cover film may have a surface resistance value of 10 12 ⁇ or less on the heat seal layer (C) side, and exceeds 1000 parts by mass. Then, since the relative amount of the thermoplastic resin is reduced, it may be difficult to obtain sufficient peel strength by heat sealing.
- At least one carbon nanomaterial of carbon nanotubes and carbon nanofibers can be contained as the conductive material.
- carbon nanotubes having an aspect ratio of 10 to 10,000 are preferable.
- the amount added to the release layer (D) is preferably 0.5 to 15 parts by mass, more preferably 3 to 10 parts by mass with respect to 100 parts by mass of the thermoplastic resin constituting the layer.
- the addition amount is less than 0.5 parts by mass, the effect of imparting conductivity due to the addition of the carbon nanomaterial may not be sufficiently obtained.
- it exceeds 15 parts by mass not only the cost increases, but also the cover film Therefore, it may be difficult to inspect the storage part through the cover film.
- the cover film of the present invention is 72 hours in an environment of 60 ° C. in order to remove moisture contained in the sealing resin in a state of being heat-sealed on the surface of the carrier tape containing electronic components as described above.
- baking is performed in an environment of 80 ° C. for about 24 hours.
- the cover film of the present invention has a small variation in peel strength when the cover film is peeled off, and heat seals the contents to electronic components when stored at a high temperature such as 60 to 80 ° C.
- the adhesiveness of the layer (C) can be controlled, it is preferable to add an inorganic filler to the heat seal layer (C) in order to more reliably prevent adhesion.
- the inorganic filler to be added is an inorganic filler such as spherical or crushed talc particles, silica particles, alumina particles, mica particles, calcium carbonate, and magnesium carbonate.
- silica particles can be used more suitably because the target particle size of the present application is easily obtained, the dispersibility is good, and there is little decrease in transparency when added to the heat seal layer (C). Can do.
- the silica fine particles it is more preferable to subject the silica fine particles to a surface treatment with at least one aliphatic oxide-modified polysiloxane of polysiloxane modified with propylene oxide or polysiloxane modified with ethylene oxide.
- a surface treatment with at least one aliphatic oxide-modified polysiloxane of polysiloxane modified with propylene oxide or polysiloxane modified with ethylene oxide.
- the inorganic filler is 10 to 50 parts by mass of an inorganic filler having a median diameter (D50) of less than 50 nm and a median diameter (D50) of 50 with respect to 100 parts by mass of the thermoplastic resin constituting the heat seal layer (C).
- the inorganic filler of ⁇ 300 nm can be contained in an amount of 20-60 mass parts.
- the method for producing the cover film of the present invention is not particularly limited, and a general method can be used.
- an adhesive such as polyurethane, polyester, polyolefin, or polyethyleneimine is applied to the surface of the biaxially stretched polyester film as the base layer (A), for example, and m-LLDPE as the intermediate layer (B) is the main component.
- the release layer (D) of the present invention can be coated on the surface of the intermediate layer (B) with, for example, a gravure coater, reverse coater, kiss coater, air knife coater, Mayer bar coater, dip coater or the like.
- the surface of the intermediate layer (B) is preferably subjected to corona treatment or ozone treatment, and particularly preferably corona treatment.
- the resin composition constituting the heat seal layer (C) on the release layer (D) applied to the intermediate layer (B) is, for example, a gravure coater, reverse coater, kiss coater, air knife coater, Mayer bar coater, dip coater, etc.
- the target cover film can be obtained by coating.
- the intermediate layer (B) is formed in advance by a T-die casting method or an inflation method
- the base layer (A) is, for example, a biaxially stretched polyester film, polyurethane, polyester, polyolefin, or the like.
- a film composed of a base layer (A) and an intermediate layer (B) can be obtained by a dry laminating method using an adhesive, and a release layer (D) and a heat seal layer (C) are formed on the surface of the intermediate layer.
- the target cover film can also be obtained by applying.
- the target cover film can also be obtained by sand lamination as another method. That is, a film constituting the intermediate layer (B) (intermediate layer 1) is formed by a T-die casting method or an inflation method. Next, between the film of the intermediate layer 1 and the base material layer (A) film, a molten resin composition containing m-LLDPE as a main component is supplied to form and laminate the intermediate layer 2. A film composed of a base layer (A) of the cover film and an intermediate layer (B) composed of the intermediate layer 1 and the intermediate layer 2 is obtained. Further, a release layer (D) and a heat seal layer ( By applying C), the intended film can be obtained. In the case of this method as well, it is common to use an adhesive-coated surface on the side of the base material layer (A) film, as in the above method.
- At least one surface of the cover film can be subjected to an antistatic treatment.
- antistatic agents include anionic, cationic, nonionic, and betaine surfactant antistatic agents, polymer antistatic agents, conductive materials, and other roll coaters and lippers using gravure rolls. It can be applied by a coater, spray or the like.
- the corona discharge treatment or ozone treatment is preferably performed on the film surface before the antistatic treatment, and corona discharge treatment is particularly preferred.
- the cover film is used as a cover material for a carrier tape that is a container for electronic components.
- the carrier tape is a belt-like object having a width of about 8 mm to 100 mm having a recess for accommodating electronic components.
- the material constituting the carrier tape is not particularly limited, and commercially available materials can be used, for example, polystyrene, polyester, polycarbonate, polyvinyl chloride, and the like.
- Carrier tapes are those in which conductivity is imparted by kneading carbon black or carbon nanotubes into the resin, those in which an antistatic agent or conductive filler is kneaded, or surfactant type antistatic agents or polypyrrole on the surface.
- an antistatic property can be used by applying a coating liquid in which a conductive material such as polythiophene is dispersed in an organic binder such as acrylic.
- the packaging body containing the electronic components may include, for example, the cover film as a cover after the electronic components are stored in the electronic component storage portion of the carrier tape, and heat sealing both edges in the longitudinal direction of the cover film. Obtained by packaging and winding on a reel. Electronic parts and the like are stored and transported by packaging in this form.
- the packaging body containing electronic components etc. is peeled off the cover film intermittently while being transported using a hole called a carrier tape transport sprocket hole provided at the longitudinal edge of the carrier tape, and the component mounting apparatus Thus, the electronic component is taken out while confirming the presence, orientation, and position of the electronic component and mounted on the substrate.
- peeling off the cover film when peeling off the cover film, if the peel strength is too small, it may be peeled off from the carrier tape, and the stored parts may fall off. If it is too large, it will be difficult to peel off the carrier tape and the cover film. Therefore, it is preferable to have a peel strength of 0.05 to 1.0 N when heat sealed at 120 to 220 ° C.
- the present invention will be described in detail by way of examples, but the present invention is not limited thereto.
- the following resin raw materials were used for the intermediate layer (B), the release layer (D), and the heat seal layer (C).
- m-LLDPE SE620M (manufactured by Tamapoly), thickness 40 ⁇ m, TMA softening temperature 110 ° C.
- B-6 m-LLDPE: Umerit 2040F (manufactured by Ube Maruzen Polyethylene), TMA softening temperature 104 ° C
- B-7 m-LLDPE: Evolue SP3010 (manufactured by Prime Polymer), TMA softening temperature 116 ° C.
- m-LLDPE Umerit 0520F (manufactured by Ube Maruzen Polyethylene), TMA softening temperature 95 ° C (B-9) m-LLDPE: Excellen FX CX1001 (manufactured by Sumitomo Chemical Co., Ltd.), TMA softening temperature 97 ° C.
- the measurement conditions for the TMA softening temperature are as follows. -JIS K-7196 compliant-Equipment: TMA / SS66000 (manufactured by SII Nano Technology) ⁇ Needle diameter: 1.0mm ⁇ ⁇ Under nitrogen atmosphere ⁇ Temperature increase rate: 5 ° C / min
- (Release layer (D) resin) (D-1) Resin: Tuftec H1041 (manufactured by Asahi Kasei Chemicals), hydrogenated resin of styrene-butadiene-styrene triblock copolymer (SEBS), styrene ratio 30% by mass, density 0.914 (D-2) Resin: Tuftec H1051 (manufactured by Asahi Kasei Chemicals), hydrogenated resin of styrene-butadiene-styrene triblock copolymer (SEBS), styrene ratio 42 mass%, density 0.894 (D-3) Resin: Septon 8007 (manufactured by Kuraray Co., Ltd.), hydrogenated resin of styrene-isoprene-styrene triblock copolymer (SEPS), styrene ratio 30% by mass, density 0.914 (D-4) Resin: Septon 2007 (manufactured by Kur
- Example 1 A film having a thickness of 40 ⁇ m made of [(b-1) m-LLDPE] polymerized with a metallocene catalyst after applying a polyester anchor coating agent on the surface of a biaxially stretched polyester film having a thickness of 12 ⁇ m by a gravure method. Were laminated by a dry lamination method to obtain a laminated film composed of a biaxially stretched polyester layer and an m-LLDPE layer. The m-LLDPE surface of this film was subjected to corona treatment.
- Examples 2, 3, 6 to 8> A cover film was produced in the same manner as in Example 1 except that the intermediate layer, the release layer, and the heat seal layer were formed using raw materials such as the resins described in Tables 1 and 2.
- Example 1 A cover film was produced in the same manner as in Example 1 except that the intermediate layer was not provided and a release layer and a heat seal layer were sequentially formed on a 50 ⁇ m-thick base material layer.
- Example 4 A resin composed of [(b-6) m-LLDPE6] polymerized with a metallocene catalyst was extruded from a T-die to obtain a film having a thickness of 40 ⁇ m.
- a film having a thickness of 40 ⁇ m made of [(b-6) m-LLDPE6] obtained by applying a polyester-based anchor coating agent to the surface of a biaxially stretched polyester film having a thickness of 12 ⁇ m by a gravure method and then extruding it first.
- the m-LLDPE surface of this film was subjected to corona treatment.
- a mixture obtained by adding 300 parts by mass of antimony-doped tin oxide dispersion [(d-5) conductive filler] to 100 parts by mass of [d-1) SEBS resin dissolved in cyclohexane was added to the laminate.
- a dry layer was applied by a gravure method so that the dry thickness was 0.4 ⁇ m.
- Example 5 A carrier tape cover film was obtained in the same manner as in Example 4 except that no conductive filler was added to the release layer.
- the cover film is peeled off at a speed of 300 mm / min and a peeling angle of 170 to 180 ° in an atmosphere of a temperature of 23 ° C. and a relative humidity of 50%
- the seal peel iron temperature is 140 ° C to 190 ° C and heat sealed at 10 ° C intervals
- the average peel strength is in the range of 0.3 to 0.9N
- the average peel strength is 0.3 to 0.9N.
- there is a seal iron temperature range that becomes the region of the above there is a seal iron temperature range that the average peel strength when the heat seal is performed at intervals of 10 ° C. from 140 ° C. to 190 ° C. is outside the range of 0.3 to 0.9 N “Good” was marked as “bad” if the average peel strength did not fall within the range of 0.3 to 0.9 N at any seal iron temperature.
- the results are shown in the sealability column of Tables 1 and 2.
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Abstract
Description
さらに、他の態様では、本発明は、上記のカバーフィルムを熱可塑性樹脂製のキャリアテープの蓋材として用いた電子部品包装体にも関する。
以下、各層について詳述する。
基材層(A)は、二軸延伸ポリエステル、あるいは二軸延伸ナイロンからなる層であり、二軸延伸ポリエチレンテレフタレート(PET)および二軸延伸ポリエチレンナフタレート(PEN)、二軸延伸した6,6-ナイロン、6-ナイロンを特に好適に用いることができる。二軸延伸PET、二軸延伸PEN、二軸延伸6,6-ナイロン、6-ナイロンとしては、通常用いられているものの他に、帯電防止処理のための帯電防止剤が塗布または練り込まれたもの、またはコロナ処理や易接着処理などを施したものを用いることができる。基材層(A)は、薄すぎるとカバーフィルム自体の引張り強度が低くなるためカバーフィルムを剥離する際に「フィルムの破断」が発生しやすい。一方、厚すぎるとキャリアテープに対するヒートシール性が低下を招くだけで無く、コスト上昇を招くため、通常12~25μmの厚みのものを好適に用いることができる。
本発明においては、基材層(A)の片面に必要に応じて接着剤層を介して中間層(B)が積層して設けられる。中間層(B)を構成する樹脂としては、特に柔軟性を有していてかつ適度の剛性があり、常温での引裂き強度に優れる直鎖状低密度ポリエチレン(以下、LLDPEと示す)を用いることができ、特に密度が0.900~0.925(×103kg/m3)の範囲の樹脂を用いることで、ヒートシールする際の熱や圧力による、カバーフィルム端部からの中間層樹脂の食み出しが起こりにくいためヒートシール時のコテの汚れが生じにくいだけでなく、カバーフィルムをヒートシールする際に中間層が軟化することによりヒートシールコテの当り斑を緩和するため、カバーフィルムを剥離する際に安定した剥離強度が得られ易い。
本発明のカバーフィルムは、中間層(B)の表面上にヒートシール層(C)を有する。ヒートシール層(C)の熱可塑性樹脂としては、アクリル系樹脂、ポリエステル系樹脂、スチレン系樹脂、エチレン-酢酸ビニル共重合樹脂などが挙げられる。なかでもアクリル系樹脂がキャリアテープを構成する素材であるポリスチレンやポリカーボネートなどに対するヒートシール性に極めて優れている。特に、ガラス転移温度が45~80℃の範囲の樹脂を用いるのが、安定した剥離強度を得る点で好ましく、より好ましくは50~75℃のアクリル系樹脂である。
本発明のカバーフィルムは、前記中間層(B)とヒートシール層(C)の間に、カバーフィルムをキャリアテープから剥離する際のレンジを小さくする目的で熱可塑性樹脂製の剥離層(D)を備えるのが好ましい。この剥離層(D)に用いる熱可塑性樹脂は、芳香族ビニル基の含有量が15~35質量%である芳香族ビニル-共役ジエン共重合体の水素添加樹脂が好ましい。剥離層(D)の樹脂の密度は0.890~0.935×103(kg/m3)の範囲が好ましく、また質量平均分子量は50,000~200,000の間であり、これらの範囲を外れる場合は剥離強度が得られにくい場合があったり、また剥離時のレンジが大きくなることがある。
剥離層(D)またはヒートシール層(C)には、導電材料として導電性フィラーの導電性酸化錫粒子、導電性酸化亜鉛粒子、導電性酸化チタン粒子の少なくとも一つを含有させることができる。中でも、アンチモンや燐、ガリウムがドーピングされた酸化錫を用いることで導電性が向上し、また透明性の低下が少ないため、より好適に用いることができる。導電性酸化錫粒子、導電性酸化亜鉛粒子、導電性酸化チタン粒子は、球状、あるいは針状のものを用いることができる。特にアンチモンをドーピングした針状の酸化錫を用いた場合、特に良好な帯電防止性能を有するカバーフィルムが得られる。添加量は、剥離層(D)を構成する熱可塑性樹脂100質量部に対して通常100~1000質量部であり、好ましくは200~800質量部である。導電性粒子の添加量が100質量部未満の場合、カバーフィルムのヒートシール層(C)側の表面抵抗値が10の12乗Ω以下のものが得られない恐れがあり、1000質量部を超えると、相対的な熱可塑性樹脂の量が減少するため、ヒートシールによる十分な剥離強度を得ることが困難となる恐れがある。
添加する無機フィラーは、球状または破砕形状のタルク粒子、シリカ粒子、アルミナ粒子、マイカ粒子、炭酸カルシウム、炭酸マグネシウムなどの無機フィラーである。特にシリカ粒子は、本願が目標とする粒子径が得られやすく、分散性が良好であり、またヒートシール層(C)に添加した際の透明性の低下が少ないことから、より好適に用いることができる。特にシリカ微粒子をプロピレンオキサイドで変性されたポリシロキサン、あるいはエチレンオキサイドで変性されたポリシロキサンのうち少なくとも1種の脂肪族オキサイド変性ポリシロキサンで表面処理することがより好ましい。無機フィラーの表面をこれらのポリシロキサンで処理することによって、ヒートシール層(C)を構成する樹脂と無機フィラー間の密着性が強くなるために、ヒートシール層(C)の機械的強度を向上させることができ、キャリアテープからカバーフィルムを剥離する際に安定した剥離強度が得られやすい。
本発明のカバーフィルムを作製する方法は特に限定されるものではなく、一般的な方法を用いることができる。例えば、ポリウレタン、ポリエステル、ポリオレフィン、ポリエチレンイミンなどの接着剤を基材層(A)として例えば二軸延伸ポリエステルフィルム表面に塗布しておき、中間層(B)となるm-LLDPEを主成分とする樹脂組成物をTダイから押出し、アンカーコート剤の塗布面にコーティングすることで、基材層(A)と中間層(B)から成る二層フィルムとすることができる。さらに中間層(B)の表面に、本発明の剥離層(D)を、例えばグラビアコーター、リバースコーター、キスコーター、エアナイフコーター、メイヤーバーコーター、ディップコーター等によりコーティングすることができる。この場合、塗工する前に、中間層(B)表面をコロナ処理やオゾン処理することが好ましく、特にコロナ処理することが好ましい。更に中間層(B)に塗布した剥離層(D)の上にヒートシール層(C)を構成する樹脂組成物を例えばグラビアコーター、リバースコーター、キスコーター、エアナイフコーター、メイヤーバーコーター、ディップコーター等によりコーティングすることで目的とするカバーフィルムを得ることができる。
カバーフィルムは、電子部品の収納容器であるキャリアテープの蓋材として用いる。キャリアテープとは、電子部品を収納するための窪みを有した幅8mmから100mm程度の帯状物である。カバーフィルムを蓋材としてヒートシールする場合、キャリアテープを構成する材質は特に限定されず、市販のものを用いることができ、例えばポリスチレン、ポリエステル、ポリカーボネート、ポリ塩化ビニル等を使用することができる。キャリアテープは、カーボンブラックやカーボンナノチューブを樹脂中に練り込むことにより導電性を付与したもの、帯電防止剤や導電フィラーが練り込まれたもの、あるいは表面に界面活性剤型の帯電防止剤やポリピロール、ポリチオフェンなどの導電物をアクリルなどの有機バインダーに分散した塗工液を塗布し帯電防止性を付与したものを用いることができる。
電子部品を収納した包装体は、例えば、キャリアテープの電子部品収納部に電子部品等を収納した後にカバーフィルムを蓋材とし、カバーフィルムの長手方向の両縁部を連続的にヒートシールして包装し、リールに巻き取ることで得られる。この形態に包装することで電子部品等は保管、搬送される。電子部品等を収納した包装体は、キャリアテープの長手方向の縁部に設けられたキャリアテープ搬送用のスプロケットホールと呼ばれる孔を用いて搬送しながら断続的にカバーフィルムを引き剥がし、部品実装装置により電子部品等の存在、向き、位置を確認しながら取り出し、基板への実装が行われる。
(b-1)m-LLDPE:LL-UL(フタムラ化学社製),厚み40μm,TMA軟化温度99℃
(b-2)m-LLDPE:LL-XUMN(フタムラ社製),厚み40μm,TMA軟化温度109℃
(b-3)m-LLDPE:UL-1(タマポリ社製),厚み40μm,TMA軟化温度107℃
(b-4)m-LLDPE:HR653(KFフィルム社製),厚み30μm,TMA軟化温度112℃
(b-5)m-LLDPE:SE620M(タマポリ社製),厚み40μm,TMA軟化温度110℃
(b-6)m-LLDPE:ユメリット2040F(宇部丸善ポリエチレン社製),TMA軟化温度104℃
(b-7)m-LLDPE:エボリューSP3010(プライムポリマー社製),TMA軟化温度116℃
(b-8)m-LLDPE:ユメリット0520F(宇部丸善ポリエチレン社製),TMA軟化温度95℃
(b-9)m-LLDPE:エクセレンFX CX1001(住友化学社製),TMA軟化温度97℃
尚、TMA軟化温度の測定条件は、次の通りである。
・JIS K-7196準拠
・装置:TMA/SS66000(SIIナノテクノロジー社製)
・触針子径:1.0mmφ
・窒素雰囲気下
・昇温速度:5℃/min
(c-1)アクリル樹脂:ダイヤナールBR-113(三菱レイヨン社製),ガラス転移温度75℃
(c-2)アクリル樹脂:ダイヤナールBR-116(三菱レイヨン社製),ガラス転移温度50℃
(ヒートシール層(C)に添加する無機フィラー)
(c-3)無機フィラー:MEK-ST-ZL(日産化学社製),シリカフィラー,メジアン径(D50)100nm
(d-1)樹脂:タフテックH1041(旭化成ケミカルズ社製),スチレン-ブタジエン-スチレントリブロック共重合体(SEBS)の水素添加樹脂,スチレン比率30質量%,密度0.914
(d-2)樹脂:タフテックH1051(旭化成ケミカルズ社製),スチレン-ブタジエン-スチレントリブロック共重合体(SEBS)の水素添加樹脂,スチレン比率42質量%,密度0.894
(d-3)樹脂:セプトン8007(クラレ社製),スチレン-イソプレン-スチレントリブロック共重合体(SEPS)の水素添加樹脂,スチレン比率30質量%,密度0.914
(d-4)樹脂:セプトン2007(クラレ社製),スチレン-イソプレン-スチレントリブロック共重合体(SEPS)の水素添加樹脂,スチレン比率30質量%,密度0.912
(剥離層(D)中に配合する導電材料)
(d-5)導電性フィラー:FSS-10T(石原産業社製),針状アンチモンドープ酸化錫,数平均長径2μm,トルエン分散タイプ
(d-6)導電性フィラー:SNS-10T(石原産業社製),球状アンチモンドープ酸化錫,メジアン径(D50)100nm,トルエン分散タイプ
厚さ12μmの二軸延伸ポリエステルフィルムの表面に、グラビア法によってポリエステル系のアンカーコート剤を塗工した後、メタロセン触媒にて重合した[(b-1)m-LLDPE]からなる厚み40μmのフィルムをドライラミネーション法により積層し、二軸延伸ポリエステル層とm-LLDPE層からなる積層フィルムを得た。このフィルムのm-LLDPE面にコロナ処理を施した。次にシクロヘキサンに溶解させた[(d-1)SEBS樹脂]100質量部に対して、アンチモンドープ酸化錫分散液[(d-5)導電性フィラー]300質量部を添加した混合物を、前記積層フィルムの中間層側の面にコロナ処理を施した面上に、グラビア法にて乾燥厚みが0.4μm厚みになるように塗工し剥離層とした。さらに、剥離層の塗工面上に、ヒートシール層としてメタクリル酸ブチルとメタクリル酸メチルのランダム共重合体[(c-1)アクリル樹脂]と、[(c-3)無機フィラー]50質量部をMEKに溶解した溶液を、乾燥後の厚みが0.8μmになるように塗工することにより、帯電防止性能を有するキャリアテープ用カバーフィルムを得た。
中間層、剥離層、およびヒートシール層を、表1および表2に記載した樹脂等の原料を用いて形成した以外は、実施例1と同様にしてカバーフィルムを作製した。
中間層を設けず、厚さ50μmの基材層上に剥離層およびヒートシール層を順次形成した以外は、実施例1と同様にしてカバーフィルムを作製した。
ヒートシール層を設けず、中間層および剥離層を、表2に記載した樹脂等の原料を用いて形成した以外は、実施例1と同様にしてカバーフィルムを作製した。
メタロセン触媒で重合された[(b-6)m-LLDPE6]からなる樹脂をTダイから押出し、厚み40μmのフィルムを得た。厚さ12μmの二軸延伸ポリエステルフィルムの表面に、グラビア法によってポリエステル系のアンカーコート剤を塗工した後、先に押出して得た[(b-6)m-LLDPE6]からなる厚み40μmのフィルムをドライラミネーション法により積層し、二軸延伸ポリエステル層とm-LLDPE層からなる積層フィルムを得た。このフィルムのm-LLDPE面にコロナ処理を施した。次に、シクロヘキサンに溶解させた[d-1)SEBS樹脂]100質量部に対して、アンチモンドープ酸化錫分散液[(d-5)導電性フィラー]300質量部を添加した混合物を、前記積層フィルムの中間層側の面でコロナ処理を施した面上に、グラビア法にて乾燥厚みが0.4μm厚みになるように塗工し剥離層とした。さらに、剥離層の塗工面上に、ヒートシール層としてメタクリル酸ブチルとメタクリル酸メチルのランダム共重合体[(c-1)アクリル樹脂]と、[(c-3)無機フィラー]50質量部をMEKに溶解した溶液を、乾燥後の厚みが0.8μmになるように塗工することにより、帯電防止性能を有するキャリアテープ用カバーフィルムを得た。
剥離層に導電性フィラーを配合しないこと以外は、実施例4と同様にしてキャリアテープ用カバーフィルムを得た。
中間層、剥離層、およびヒートシール層を、表2に記載した樹脂等の原料を用いて形成した以外は、実施例4と同様にしてカバーフィルムを作製した。
各実施例及び各比較例で作製した電子部品のキャリアテープ用カバーフィルムについて下記に示す評価を行った。これらの結果を表1および表2にまとめて示す。
JIS K7105:1998の測定法Aに準じて、積分球式測定装置を用いて曇価を測定した。フィルム製膜性が著しく悪くフィルムが得られず、曇価を評価できなかったものについては、「未評価」と表記した。結果を表1及び表2の曇価の欄に示す。
テーピング機(澁谷工業社、ETM-480)を使用し、シールヘッド幅0.5mm×2、シールヘッド長32mm、シール圧力0.1MPa、送り長4mm、シール時間0.1秒×8回にてシールコテ温度140℃から190℃まで10℃間隔で5.5mm幅のカバーフィルムを8mm幅のポリカーボネート製キャリアテープ(電気化学工業社製)、及びポリスチレン製キャリアテープ(電気化学工業社製)にヒートシールした。温度23℃、相対湿度50%の雰囲気下に24時間放置後、同じく温度23℃、相対湿度50%の雰囲気下にて毎分300mmの速度、剥離角度170~180°でカバーフィルムを剥離し、シールコテ温度140℃から190℃まで10℃間隔でヒートシールした時の平均剥離強度が0.3~0.9Nの範囲にあるものを「優」とし、平均剥離強度が0.3~0.9Nの領域となるシールコテ温度範囲はあるものの、シールコテ温度140℃から190℃まで10℃間隔でヒートシールした時の平均剥離強度が0.3~0.9Nの範囲を外れるシールコテ温度範囲があるものを「良」とし、何れのシールコテ温度においても平均剥離強度が0.3~0.9Nの領域に入らないものを「不良」として表記した。結果を表1及び表2のシール性の欄に示す。
ポリスチレン製キャリアテープ(電気化学工業社製)に対する剥離強度が0.4Nとなるようにヒートシールを行った。カバーフィルムを前記(2)シール性と同条件で剥離した。剥離方向に100mm分のカバーフィルムを剥離した際に得られたチャートから剥離強度のバラツキを導き出した。剥離強度のバラツキが0.2N以下であるものを「優」、0.2から0.4Nであるものを「良」、0.4Nより大きいものを「不良」とし、剥離強度が0.4Nに満たないものについては「未評価」として標記した。結果を表1及び表2の剥離のバラツキの欄に示す。
ポリスチレン製キャリアテープ(電気化学工業社製)に対する剥離強度が1.0Nとなるようにヒートシールを行った。カバーフィルムを前記(2)シール性と同条件で剥離した。カバーフィルムをシールしたキャリアテープを550mmの長さで切り取り、両面粘着テープを貼った垂直な壁にキャリアテープのポケット底部を貼り付けた。貼り付けてあるキャリアテープの上部からカバーフィルムを50mm剥がし、カバーフィルムをクリップで挟み、このクリップに質量1000gの重りを取り付けた。その後、重りを自然落下させた時に、50サンプル中1サンプルもカバーフィルムが破断しなかったものを「優」、50サンプル中1~5サンプルのカバーフィルムが破断したものを「良」、5サンプル以上破断したものを「不良」として表記した。また、(2)シール性の評価にて剥離強度が1.0Nに満たないものについては「未評価」とした。結果を表1及び表2のフィルム破断耐性の欄に示す。
三菱化学社のハイレスタUP MCP-HT450を使用しJIS K6911の方法にて、雰囲気温度23℃、雰囲気湿度50%RH、印加電圧10Vでヒートシール層表面の表面抵抗率を測定した。結果を表1及び表2の表面抵抗率の欄に示す。
2 基材層
3 アンカーコート層
4 中間層
5 剥離層
6 ヒートシール層
Claims (5)
- 少なくとも基材層(A)、中間層(B)、およびキャリアテープにヒートシール可能な熱可塑性樹脂を有するヒートシール層(C)を有し、
中間層(B)がメタロセン直鎖状低密度ポリエチレンを含み、該メタロセン直鎖状低密度ポリエチレンのJIS K7196によるTMA法の軟化温度が98~109℃であるカバーフィルム。 - 前記中間層(B)とヒートシール層(C)の間に剥離層(D)を有し、ヒートシール層(C)または剥離層(D)のいずれかが導電材料を含有する請求項1記載のカバーフィルム。
- 剥離層(D)が、芳香族ビニル基の含有量が樹脂全体を100質量%としたとき15~35質量%であり、密度が0.890~0.935×103(kg/m3)である芳香族ビニル-共役ジエン共重合体の水素添加樹脂を含む請求項2に記載のカバーフィルム。
- 導電材料が導電性微粒子であり、形状が針状、球状の微粒子のいずれかまたはこれらの組み合わせであることを特徴とする請求項2または請求項3に記載のカバーフィルム。
- 請求項1~4のいずれか1項に記載のカバーフィルムを、熱可塑性樹脂製のキャリアテープの蓋材として用いた電子部品包装体。
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WO2015029867A1 (ja) * | 2013-09-02 | 2015-03-05 | 電気化学工業株式会社 | カバーフィルムおよび電子部品包装体 |
JP2015189120A (ja) * | 2014-03-28 | 2015-11-02 | 五洋紙工株式会社 | ポリオレフィン系樹脂積層フィルム |
JP2017007739A (ja) * | 2015-06-17 | 2017-01-12 | 浙江潔美電子科技股▲ふん▼有限公司 | 電子部品の収納用キャリアテープのカバーテープ及びその調製方法 |
WO2018101295A1 (ja) * | 2016-12-02 | 2018-06-07 | 大日本印刷株式会社 | 透明導電性カバーテープ |
WO2021070936A1 (ja) * | 2019-10-11 | 2021-04-15 | 大日本印刷株式会社 | 電子部品包装用カバーテープ、包装体、および包装体用セット |
WO2022210158A1 (ja) * | 2021-03-31 | 2022-10-06 | 住友ベークライト株式会社 | 電子部品包装用カバーテープおよび電子部品包装体 |
JP2022158849A (ja) * | 2021-03-31 | 2022-10-17 | 住友ベークライト株式会社 | 電子部品包装用カバーテープおよび電子部品包装体 |
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WO2019087999A1 (ja) * | 2017-10-31 | 2019-05-09 | デンカ株式会社 | カバーフィルム |
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JP2022158849A (ja) * | 2021-03-31 | 2022-10-17 | 住友ベークライト株式会社 | 電子部品包装用カバーテープおよび電子部品包装体 |
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