WO2022149416A1 - 電子部品包装用シート - Google Patents
電子部品包装用シート Download PDFInfo
- Publication number
- WO2022149416A1 WO2022149416A1 PCT/JP2021/046017 JP2021046017W WO2022149416A1 WO 2022149416 A1 WO2022149416 A1 WO 2022149416A1 JP 2021046017 W JP2021046017 W JP 2021046017W WO 2022149416 A1 WO2022149416 A1 WO 2022149416A1
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- WO
- WIPO (PCT)
- Prior art keywords
- base material
- material layer
- sheet
- layer
- resin
- Prior art date
Links
- 238000004806 packaging method and process Methods 0.000 title claims abstract description 66
- 239000000463 material Substances 0.000 claims abstract description 165
- 229920005992 thermoplastic resin Polymers 0.000 claims abstract description 35
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 claims description 37
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 229920005989 resin Polymers 0.000 description 60
- 239000011347 resin Substances 0.000 description 60
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 31
- XECAHXYUAAWDEL-UHFFFAOYSA-N acrylonitrile butadiene styrene Chemical compound C=CC=C.C=CC#N.C=CC1=CC=CC=C1 XECAHXYUAAWDEL-UHFFFAOYSA-N 0.000 description 22
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 description 22
- 239000011342 resin composition Substances 0.000 description 20
- 239000004431 polycarbonate resin Substances 0.000 description 19
- 229920005668 polycarbonate resin Polymers 0.000 description 19
- 238000004080 punching Methods 0.000 description 15
- 229920001225 polyester resin Polymers 0.000 description 14
- 238000000034 method Methods 0.000 description 13
- 239000000178 monomer Substances 0.000 description 13
- 238000000465 moulding Methods 0.000 description 12
- -1 styrene-ethylene-butylene-styrene Chemical class 0.000 description 11
- 239000004793 Polystyrene Substances 0.000 description 10
- 229920001577 copolymer Polymers 0.000 description 8
- 239000004645 polyester resin Substances 0.000 description 8
- 150000003440 styrenes Chemical class 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 238000011156 evaluation Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000011164 primary particle Substances 0.000 description 6
- 239000000758 substrate Substances 0.000 description 6
- 229920006027 ternary co-polymer Polymers 0.000 description 6
- XYLMUPLGERFSHI-UHFFFAOYSA-N alpha-Methylstyrene Chemical compound CC(=C)C1=CC=CC=C1 XYLMUPLGERFSHI-UHFFFAOYSA-N 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- HJWLCRVIBGQPNF-UHFFFAOYSA-N prop-2-enylbenzene Chemical compound C=CCC1=CC=CC=C1 HJWLCRVIBGQPNF-UHFFFAOYSA-N 0.000 description 5
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 description 4
- 239000006230 acetylene black Substances 0.000 description 4
- 229920001893 acrylonitrile styrene Polymers 0.000 description 4
- 125000003118 aryl group Chemical group 0.000 description 4
- 150000001735 carboxylic acids Chemical class 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- SCUZVMOVTVSBLE-UHFFFAOYSA-N prop-2-enenitrile;styrene Chemical compound C=CC#N.C=CC1=CC=CC=C1 SCUZVMOVTVSBLE-UHFFFAOYSA-N 0.000 description 4
- SBYMUDUGTIKLCR-UHFFFAOYSA-N 2-chloroethenylbenzene Chemical compound ClC=CC1=CC=CC=C1 SBYMUDUGTIKLCR-UHFFFAOYSA-N 0.000 description 3
- 239000004419 Panlite Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- KETWBQOXTBGBBN-UHFFFAOYSA-N hex-1-enylbenzene Chemical compound CCCCC=CC1=CC=CC=C1 KETWBQOXTBGBBN-UHFFFAOYSA-N 0.000 description 3
- 239000003607 modifier Substances 0.000 description 3
- 229920000515 polycarbonate Polymers 0.000 description 3
- 239000004417 polycarbonate Substances 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 229920002554 vinyl polymer Polymers 0.000 description 3
- WHFHDVDXYKOSKI-UHFFFAOYSA-N 1-ethenyl-4-ethylbenzene Chemical compound CCC1=CC=C(C=C)C=C1 WHFHDVDXYKOSKI-UHFFFAOYSA-N 0.000 description 2
- QQHQTCGEZWTSEJ-UHFFFAOYSA-N 1-ethenyl-4-propan-2-ylbenzene Chemical compound CC(C)C1=CC=C(C=C)C=C1 QQHQTCGEZWTSEJ-UHFFFAOYSA-N 0.000 description 2
- WAEOXIOXMKNFLQ-UHFFFAOYSA-N 1-methyl-4-prop-2-enylbenzene Chemical group CC1=CC=C(CC=C)C=C1 WAEOXIOXMKNFLQ-UHFFFAOYSA-N 0.000 description 2
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 2
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 2
- YMOONIIMQBGTDU-VOTSOKGWSA-N [(e)-2-bromoethenyl]benzene Chemical compound Br\C=C\C1=CC=CC=C1 YMOONIIMQBGTDU-VOTSOKGWSA-N 0.000 description 2
- 125000001931 aliphatic group Chemical group 0.000 description 2
- 125000000217 alkyl group Chemical group 0.000 description 2
- 239000012298 atmosphere Substances 0.000 description 2
- 229920001400 block copolymer Polymers 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-N carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 2
- 239000006258 conductive agent Substances 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 150000001993 dienes Chemical class 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 229920005669 high impact polystyrene Polymers 0.000 description 2
- 239000004797 high-impact polystyrene Substances 0.000 description 2
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 229920001707 polybutylene terephthalate Polymers 0.000 description 2
- 229920001610 polycaprolactone Polymers 0.000 description 2
- 239000004632 polycaprolactone Substances 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 229920000098 polyolefin Polymers 0.000 description 2
- 229920002223 polystyrene Polymers 0.000 description 2
- 229920005990 polystyrene resin Polymers 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229920006132 styrene block copolymer Polymers 0.000 description 2
- 238000007666 vacuum forming Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- KYPOHTVBFVELTG-OWOJBTEDSA-N (e)-but-2-enedinitrile Chemical compound N#C\C=C\C#N KYPOHTVBFVELTG-OWOJBTEDSA-N 0.000 description 1
- IGGDKDTUCAWDAN-UHFFFAOYSA-N 1-vinylnaphthalene Chemical compound C1=CC=C2C(C=C)=CC=CC2=C1 IGGDKDTUCAWDAN-UHFFFAOYSA-N 0.000 description 1
- BTOVVHWKPVSLBI-UHFFFAOYSA-N 2-methylprop-1-enylbenzene Chemical compound CC(C)=CC1=CC=CC=C1 BTOVVHWKPVSLBI-UHFFFAOYSA-N 0.000 description 1
- VPWNQTHUCYMVMZ-UHFFFAOYSA-N 4,4'-sulfonyldiphenol Chemical class C1=CC(O)=CC=C1S(=O)(=O)C1=CC=C(O)C=C1 VPWNQTHUCYMVMZ-UHFFFAOYSA-N 0.000 description 1
- 229930185605 Bisphenol Natural products 0.000 description 1
- 238000005773 Enders reaction Methods 0.000 description 1
- GYCMBHHDWRMZGG-UHFFFAOYSA-N Methylacrylonitrile Chemical compound CC(=C)C#N GYCMBHHDWRMZGG-UHFFFAOYSA-N 0.000 description 1
- 239000006057 Non-nutritive feed additive Substances 0.000 description 1
- 239000005062 Polybutadiene Substances 0.000 description 1
- 229920000954 Polyglycolide Polymers 0.000 description 1
- 239000002174 Styrene-butadiene Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- WNLRTRBMVRJNCN-UHFFFAOYSA-L adipate(2-) Chemical compound [O-]C(=O)CCCCC([O-])=O WNLRTRBMVRJNCN-UHFFFAOYSA-L 0.000 description 1
- 230000003373 anti-fouling effect Effects 0.000 description 1
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 1
- 239000006231 channel black Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004581 coalescence Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004049 embossing Methods 0.000 description 1
- 239000006232 furnace black Substances 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000011256 inorganic filler Substances 0.000 description 1
- 229910003475 inorganic filler Inorganic materials 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 description 1
- 229920000747 poly(lactic acid) Polymers 0.000 description 1
- 229920001515 polyalkylene glycol Polymers 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 229920001748 polybutylene Polymers 0.000 description 1
- 229920000921 polyethylene adipate Polymers 0.000 description 1
- 239000011112 polyethylene naphthalate Substances 0.000 description 1
- 239000004633 polyglycolic acid Substances 0.000 description 1
- 239000004626 polylactic acid Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001955 polyphenylene ether Polymers 0.000 description 1
- 229920005673 polypropylene based resin Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000011115 styrene butadiene Substances 0.000 description 1
- 229920003048 styrene butadiene rubber Polymers 0.000 description 1
- 229920000468 styrene butadiene styrene block copolymer Polymers 0.000 description 1
Images
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
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
- B65D65/40—Applications of laminates for particular packaging purposes
-
- 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
- B65D75/00—Packages comprising articles or materials partially or wholly enclosed in strips, sheets, blanks, tubes, or webs of flexible sheet material, e.g. in folded wrappers
- B65D75/28—Articles or materials wholly enclosed in composite wrappers, i.e. wrappers formed by associating or interconnecting two or more sheets or blanks
- B65D75/30—Articles or materials enclosed between two opposed sheets or blanks having their margins united, e.g. by pressure-sensitive adhesive, crimping, heat-sealing, or welding
- B65D75/32—Articles or materials enclosed between two opposed sheets or blanks having their margins united, e.g. by pressure-sensitive adhesive, crimping, heat-sealing, or welding one or both sheets or blanks being recessed to accommodate contents
- B65D75/36—Articles or materials enclosed between two opposed sheets or blanks having their margins united, e.g. by pressure-sensitive adhesive, crimping, heat-sealing, or welding one or both sheets or blanks being recessed to accommodate contents one sheet or blank being recessed and the other formed of relatively stiff flat sheet material, e.g. blister packages, the recess or recesses being preformed
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
-
- 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
- B65D2585/00—Containers, packaging elements or packages specially adapted for particular articles or materials
- B65D2585/68—Containers, packaging elements or packages specially adapted for particular articles or materials for machines, engines, or vehicles in assembled or dismantled form
- B65D2585/86—Containers, packaging elements or packages specially adapted for particular articles or materials for machines, engines, or vehicles in assembled or dismantled form for electrical components
Definitions
- the present invention relates to a sheet for packaging electronic parts.
- thermoplastic resin constituting the packaging container for these electronic parts, polystyrene-based resin, ABS-based resin, polyvinyl chloride-based resin, polypropylene-based resin, polyester-based resin, polyphenylene ether-based resin, polycarbonate-based resin and the like are used. There is.
- a packaging container provided with a conductive layer made of a resin containing a conductive agent such as conductive carbon black on the surface of a base material layer made of an ABS resin.
- a conductive layer made of a resin containing a conductive agent such as conductive carbon black on the surface of a base material layer made of an ABS resin.
- the above-mentioned trays and carrier tapes can be obtained by molding a sheet for packaging electronic components by a known method, but during the molding, particularly when slitting the raw sheet, punching out a sprocket hole, etc. Fluff and burrs may occur. If such burrs and fluff fall off into the storage portion (pocket) and adhere to the electronic component, the electronic component may be defective. In recent years, with the miniaturization of electronic components, there is a strong demand for reducing defects caused by adhesion of burrs and fluff.
- Japanese Unexamined Patent Publication No. 9-174769 Japanese Patent Application Laid-Open No. 2002-292805 International Publication No. 2006/030871 Japanese Patent Application Laid-Open No. 2003-170547
- an object of the present invention is to provide a sheet for packaging electronic parts and a molded body including the sheet, which can effectively suppress the generation of fluff and burrs while maintaining good moldability.
- the inventors of the present application include a base material sheet having a multilayer structure in which a base material layer A and a base material layer B are alternately laminated, which contain different thermoplastic resins, and described above. It was found that all the above-mentioned problems can be solved by a sheet for packaging electronic parts in which the average value of the thicknesses of the individual layers of the base material layer A exceeds the average value of the thicknesses of the individual layers of the base material layer B. , The present invention has been completed. That is, the present invention has the following aspects.
- a sheet for packaging electronic components including a base sheet in which a base layer A and a base layer B are alternately laminated, and the thickness of each layer of the base layer A is 10 to 60 ⁇ m.
- the thickness of each layer of the base material layer B is 1 to 50 ⁇ m, and the average value of the thickness of each layer of the base material layer A is the average value of the thickness of each layer of the base material layer B.
- a sheet for packaging electronic components which is imaginary and contains the base material layer A and the base material layer B as main components of different thermoplastic resins.
- the sheet for packaging electronic components according to [1], wherein the number of layers in which the base material layer A and the base material layer B are alternately laminated is 3 to 70.
- the average value of the thicknesses of the individual layers of the base material layer A is 1.001 times or more the average value of the thicknesses of the individual layers of the base material layer B.
- Described electronic component packaging sheet [4] The sheet for packaging electronic components according to any one of [1] to [3], wherein the base material layer A contains an ABS resin as a main component. [5] The sheet for packaging electronic components according to any one of [1] to [4], wherein the base material layer B contains a thermoplastic resin other than an ABS resin as a main component. [6] A molded product comprising the electronic component packaging sheet according to any one of [1] to [5]. [7] The molded product according to [6], which is a container. [8] The molded product according to [6], which is a carrier tape.
- the present invention it is possible to provide a sheet for packaging electronic components and a molded body including the sheet, which can effectively suppress the generation of fluff and burrs while maintaining good moldability.
- the electronic component packaging sheet according to the present invention (hereinafter, may be simply referred to as “sheet”) includes an electronic component packaging in which a substrate layer A and a substrate layer B are alternately laminated.
- the thickness of each layer of the base material layer A is 10 to 60 ⁇ m
- the thickness of each layer of the base material layer B is 1 to 50 ⁇ m
- the thickness of each layer of the base material layer A is 1 to 50 ⁇ m.
- the average value of the thickness of the layers is more than the average value of the thicknesses of the individual layers of the base material layer B, and the base material layer A and the base material layer B contain different thermoplastic resins as main components. It is characterized by.
- the sheet for packaging electronic components of the present invention can effectively suppress the generation of fluff and burrs while maintaining good moldability.
- the electronic component packaging sheet according to the present invention includes a base material sheet.
- the base material sheet is a base material sheet having a multi-layer structure in which base material layers A and base material layers B are alternately laminated.
- the electronic component packaging sheet according to the present invention can effectively suppress the generation of burrs and fluff.
- the moldability when molding the electronic component packaging sheet into a carrier tape or the like does not deteriorate, and a pocket having a desired shape can be molded.
- the number of layers in which the base material layer A and the base material layer B are alternately laminated, that is, the total number of layers of the base material sheets is not particularly limited as long as the effect of the present invention is obtained.
- the total number of laminated layers is preferably 3 to 70, more preferably 4 to 60, and even more preferably 5 to 30. ..
- the total number of laminated base sheets is 3 to 70, it becomes easy to obtain a base sheet having a desired thickness while suppressing the generation of burrs and fluff.
- it is preferable that the total number of laminated base layers A is larger than the total number of laminated base layers B.
- the base material layer A and the base material layer B constituting the base material sheet contain different thermoplastic resins as main components.
- containing as a main component means that the proportion of the thermoplastic resin in the resin composition (100% by mass) constituting the base material layer A or the base material layer B is 50% by mass or more. do.
- the proportion of the thermoplastic resin in the resin composition constituting the base material layer A or the base material layer B may be 100% by mass.
- the "different thermoplastic resin” includes not only different types of thermoplastic resins but also thermoplastic resins having different physical characteristics.
- the base material layer A and the base material layer B may contain different types of thermoplastic resins as main components, or may contain the same thermoplastic resin having different physical properties as main components. May be. From the viewpoint that it is easy to confirm the thickness of each layer when forming the base sheet, it is preferable that the base layer A and the base layer B contain a different type of thermoplastic resin as a main component.
- thermoplastic resin examples include polystyrene-based resin (PS-based resin), ABS-based resin, polyester-based resin, polycarbonate-based resin (PC-based resin), acrylonitrile-styrene binary copolymer (AS-based resin), and the like. Be done. These thermoplastic resins may be used alone or in combination of two or more.
- PS-based resin examples include polystyrene resin, rubber-modified styrene resin (rubber-g-styrene-based resin (GPPS), impact-resistant styrene resin (HIPS)), and the like.
- the PS-based resin may be used alone or in combination of two or more.
- aromatic vinyl monomer for forming the PS-based resin examples include styrene and alkyl-substituted styrene (for example, vinyl toluene, vinyl xylene, p-ethyl styrene, p-isopropyl styrene, butyl styrene, and pt-.
- alkyl-substituted styrene for example, vinyl toluene, vinyl xylene, p-ethyl styrene, p-isopropyl styrene, butyl styrene, and pt-.
- the MFR measured according to the ISO 1133 standard is preferably 1 to 30 g / 10 min, more preferably 2 to 25 g / 10 min.
- the ABS resin is mainly composed of a ternary copolymer of a diene rubber-aromatic vinyl monomer-vinyl cyanide monomer, and is typically acrylonitrile-butadiene-styrene ternary copolymer. It means a resin or a resin composition containing a coalescence as a main component. Specific examples thereof include an acrylonitrile-butadiene-styrene ternary copolymer, a mixture of an acrylonitrile-butadiene-styrene ternary copolymer and an acrylonitrile-styrene binary copolymer and the like.
- an acrylonitrile-butadiene-styrene ternary copolymer as the ABS resin, and further, a mixture of an acrylonitrile-butadiene-styrene ternary copolymer and an acrylonitrile-styrene binary copolymer is used. It is more preferable to use it.
- these polymers contain monomers such as ⁇ -methylstyrene, vinyltoluene, dimethylstyrene, chlorostyrene, and vinylnaphthalene as trace components of styrene-based monomers. Things are also included.
- the trace component of the vinyl cyanide monomer those containing a monomer such as methacrylonitrile, etacrylonitrile, and fumaronitrile are also included. In the following description, the description of trace components is omitted, but those containing these components are also included as long as the effects of the present invention are not impaired.
- the ABS resin may be used alone or in combination of two or more.
- the MFR measured according to the ISO 1133 standard for ABS resins is preferably 1 to 30 g / 10 min, more preferably 2 to 25 g / 10 min.
- polyester-based resin examples include a polyester resin obtained from an aromatic polyfunctional carboxylic acid, an aliphatic polyfunctional carboxylic acid, and a polyfunctional glycol, a hydroxycarboxylic acid-based polyester resin, and the like.
- polyester resin obtained from the aromatic polyfunctional carboxylic acid or the aliphatic polyfunctional carboxylic acid and the polyfunctional glycol include polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate, polybutylene naphthalate, polyethylene adipate and polybutylene. Examples include adipate and other copolymers thereof.
- other copolymers include polyester resins obtained by copolymerizing polyalkylene glycol, polycaprolactone and the like.
- hydroxycarboxylic acid-based polyester resin examples include polylactic acid, polyglycolic acid, and polycaprolactone.
- copolymers of the polyester resins exemplified above can also be used.
- the polyester resin may be used alone or in combination of two or more.
- the MFR measured according to the ISO 1133 standard for polyester resins is preferably 1 to 30 g / 10 min, more preferably 2 to 25 g / 10 min.
- the PC-based resin is a resin derived from a dihydroxy compound, of which a resin derived from an aromatic dihydroxy compound is preferable, and in particular, an aroma in which two aromatic dihydroxy compounds are bonded via a certain binding group.
- Group dihydroxy compounds bisphenols
- the PC-based resin may be used alone or in combination of two or more.
- the MFR measured according to the ISO 1133 standard for PC resins is preferably 1 to 30 g / 10 min, more preferably 2 to 25 g / 10 min.
- the AS-based resin is a resin containing a binary copolymer of acrylonitrile and a styrene-based monomer as a main component.
- the styrene-based monomer include styrene, alkyl-substituted styrene (for example, vinyltoluene, vinylxylene, p-ethylstyrene, p-isopropylstyrene, butylstyrene, pt-butylstyrene, etc.) and halogen-substituted styrene (for example).
- chlorostyrene bromostyrene, etc.
- ⁇ -alkyl-substituted styrene in which an alkyl group is substituted at the ⁇ -position for example, ⁇ -methylstyrene, etc.
- styrene-based monomers may be used alone or in combination of two or more.
- styrene monomers styrene, vinyltoluene, ⁇ -methylstyrene and the like, particularly styrene, are usually preferably used.
- the base material layer A or the base material layer B is preferably composed of a resin composition containing at least one resin selected from the above-mentioned thermoplastic resins as a main component.
- the PS-based resin contains, for example, styrene-butadiene within a range not exceeding 50% by mass as a modifier.
- SB Block copolymers of styrene and diene such as block copolymers, olefin-styrene block copolymers and polyolefins which are hydrogenating agents thereof can be mixed.
- the base material layer A or the base material layer B contains a polycarbonate-based (PC-based) resin as a main component as the thermoplastic resin
- the PC-based resin does not exceed 50% by mass as a modifier.
- ABS resin, polyethylene terephthalate resin, polybutylene terephthalate resin and the like can be mixed.
- the resin component as various modifiers can be added within a range not exceeding 50% by mass.
- various additives such as lubricants, plasticizers, and processing aids can be added as needed.
- the DuPont impact strength of the base material layer B is preferably higher than the DuPont impact strength of the base material layer A. Further, the difference in DuPont impact strength between the base material layer A and the base material layer B is preferably 0.2 J or more, and more preferably 0.5 J or more. When the impact strength of the base material layer A and the base material layer B is within the above-mentioned range, the layers are easily divided at the boundary between the base material layer A and the base material layer B, and the generation of burrs and fluff is more effectively suppressed. It will be easier to do.
- the DuPont impact strength of the substrate layers A and B refers to a value measured according to the DuPont impact strength measuring method of JIS K 5400.
- the thermoplastic resin contained in the base material layer A is preferably an ABS-based resin.
- the base material layer A is a layer containing an ABS resin as a main component, it is easy to maintain the moldability of the obtained electronic component packaging sheet, and it is easy to suppress burrs more effectively.
- the ratio of the ABS-based resin contained in the base material layer A is preferably 50% by mass or more, more preferably 60 to 100% by mass, and 75 to 100% with respect to the total mass of the resin composition constituting the base material layer A. Mass% is particularly preferred.
- the ABS-based resin those having a butadiene rubber content ratio of 5 to 30% are more preferable from the viewpoint of strength and moldability.
- the base material layer A may contain an ABS-based resin and other thermoplastic resins.
- the other thermoplastic resin a PC-based resin and a polyester-based resin are preferable, and a PC-based resin is more preferable.
- the ratio of the ABS-based resin to the other thermoplastic resin in the resin composition constituting the base material layer A (ABS-based resin / other).
- the thermoplastic resin may be in the range of 99/1 to 50/50.
- the base material layer B is preferably a layer containing a thermoplastic resin other than the ABS resin as a main component. If the base material layer B is a layer containing a thermoplastic resin other than the ABS resin as a main component, it becomes easier to more effectively suppress the generation of burrs and fluff.
- a thermoplastic resin contained in the base material layer B a PC-based resin and a polyester-based resin are preferable, and a PC-based resin is more preferable.
- the ratio of the PC-based resin in the resin composition constituting the base material layer B is preferably 50% by mass or more, preferably 60% by mass or more, based on the total mass of the resin composition.
- the base material layer A is a layer containing an ABS-based resin as a main component
- the base material layer B is a layer containing a PC-based resin as a main component.
- the base material layer B may contain an ABS-based resin. At that time, the base material layer A may contain an ABS resin as a main component. When the base material layer A contains ABS resin as a main component, the base material layer B may contain a binary copolymer of acrylonitrile-styrene as a main component.
- the thickness of each layer of the base material layer A constituting the base material sheet is 10 to 60 ⁇ m, preferably 15 to 50 ⁇ m, and more preferably 20 to 45 ⁇ m.
- the thickness of each layer of the base material layer B is 1 to 50 ⁇ m, preferably 5 to 40 ⁇ m, and more preferably 10 to 30 ⁇ m. Further, in the electronic component packaging sheet according to the present invention, the average value of the thicknesses of the individual layers of the base material layer A exceeds the average value of the thicknesses of the individual layers of the base material layer B.
- the base material layers A and B containing different thermoplastic resins as the main components are alternately laminated, and the average value of the thicknesses of the individual layers of the base material layer A is calculated as the individual layers of the base material layer B.
- the thickness By setting the thickness to more than the average value of, it is possible to effectively suppress the generation of burrs and fluff during punching of the sheet.
- "thickness of each layer” means the maximum value of the thickness of each layer. The thickness of each of the base material layers A and B in the base material sheet can be confirmed, for example, by observing the cross section of the base material sheet with a microscope or the like.
- the individual layers of the base material layer A included in the base material sheet may all have the same thickness, or each layer may have a different thickness. From the viewpoint that the winding habit is less likely to occur when the sheet is wound, it is preferable that all the individual layers of the base material layer A have the same thickness.
- the individual layers of the base material layer B may all have the same thickness or may have different thicknesses in each layer, but from the viewpoint that the winding habit when the sheet is rolled is less likely to occur, the base material is used. It is preferred that the individual layers of layer B all have the same thickness.
- burrs and fluff generated when molding a sheet are generated by stretching the resin during punching of the sheet. If the thickness of the base material portion of the sheet is reduced, the generation of burrs and fluff is relatively suppressed, but if the thickness of the base material portion is simply reduced, the various physical properties required for the electronic component packaging sheet are cleared. It becomes difficult.
- the inventors of the present application have found that the generation of burrs and fluff due to the elongation of the resin can be suppressed by making the base material sheet a multi-layer structure and reducing the layer thickness of one layer.
- the two types of base material layers A and B containing the above-mentioned different thermoplastic resins as the main components are alternately laminated, and the average value of the thicknesses of the individual layers of the base material layer A is calculated as the base material layer B. It was found that the generation of burrs and fluff can be suppressed more effectively by designing the thickness larger than the average value of the thickness of each layer.
- the base material layer B becomes a "fault fault" of the base material layer A, and the elongation of the resin of the base material layer A can be effectively suppressed.
- the electronic component packaging sheet according to the present invention provided with such a base sheet has good moldability.
- the average thickness of the individual layers of the base material layer A is preferably 10 to 60 ⁇ m, preferably 15 to 50 ⁇ m, and more preferably 20 to 45 ⁇ m.
- the average thickness of the individual layers of the base material layer B is preferably 1 to 50 ⁇ m, preferably 5 to 40 ⁇ m, and more preferably 10 to 30 ⁇ m.
- the "average value of the thicknesses of the individual layers of the base material layer A” refers to a value obtained by dividing the total thickness of the base material layer A in the base material sheet by the number of layers of the base material layer A. .. That is, it means a value calculated by (a1 + a2 + a3 + ... + an) / n when the thickness of one layer of the base material layer A is "a1".
- "n" refers to the total number of laminated base layers A in the base sheet. The same applies to the base material layer B.
- the average value of the thicknesses of the individual layers of the base material layer A is preferably 1.001 times or more the average value of the thicknesses of the individual layers of the base material layer B.
- the upper limit value is not particularly limited as long as it has the effect of the present invention, but is preferably 20.0 times or less from the viewpoint of film forming property.
- the average value of the thicknesses of the individual layers of the substrate layer A is more preferably 1.001 to 20 times the average value of the thicknesses of the individual layers of the substrate layer B. , 1.01 to 15.0 times, more preferably 1.05 to 12.0 times, and particularly preferably 1.05 to 12.0 times.
- the thickness of the base sheet is preferably 50 to 700 ⁇ m, more preferably 75 to 600 ⁇ m, and particularly preferably 90 to 450 ⁇ m from the viewpoint of strength and moldability when used as a carrier tape.
- the electronic component packaging sheet according to the present invention may be composed of only the above-mentioned base material sheet.
- the electronic component packaging sheet according to the present invention is a conductive sheet
- a conductive layer can be formed on at least one surface of the base material sheet.
- an arbitrary layer for example, an antifouling layer or the like may be provided on the base material sheet.
- the electronic component packaging sheet according to the present invention may be provided with a conductive layer on at least one surface of the base material sheet.
- the conductive layer is a layer composed of a resin composition containing a conductive component.
- the resin composition constituting the conductive layer is not particularly limited as long as it has the effect of the present invention.
- the above-mentioned thermoplastic resin is contained in an amount of 65 to 95% by mass, preferably 70 to 90% by mass
- a conductive agent such as carbon black is contained in an amount of 5 to 35% by mass, preferably 10 to 10 to the total mass of the resin composition. Examples thereof include a resin composition containing 30% by mass.
- Examples of carbon black include furnace black, channel black, acetylene black and the like, preferably having a large specific surface area and obtaining high conductivity with a small amount of addition. Specifically, those having an average primary particle diameter of 20 to 100 nm are preferable, and those having an average primary particle diameter of 25 to 65 nm are more preferable.
- the average primary particle diameter means the average diameter of particles measured using a transmission electron microscope.
- the thickness of the conductive layer is preferably 3 to 100 ⁇ m, more preferably 10 to 50 ⁇ m.
- the same method as a general method for manufacturing a multilayer sheet can be used.
- the method described in JP-A-2007-307893 can be adopted.
- the resin composition forming the base material layer A and the resin composition forming the base material layer B are supplied to individual extruders, melt-kneaded, and supplied to a feed block.
- the base material layer A and the base material layer B are laminated so as to be alternately overlapped with each other.
- the thickness of each layer of the base material layer A is in the range of 10 to 60 ⁇ m
- the thickness of each layer of the base material layer B is in the range of 1 to 50 ⁇ m
- the thickness of each layer of the base material layer A is in the range of 1 to 50 ⁇ m.
- 3 to 70 layers are laminated to prepare a base material sheet having a multilayer structure. ..
- the sheet for packaging electronic components of the present invention is a conductive sheet
- a resin composition for forming a conductive layer which is melt-kneaded by another extruder on one side or both surfaces of the base material sheet, is applied. It can be laminated to form a sheet for packaging electronic components.
- the electronic component packaging sheet according to the present invention can be formed into a molded product by molding it by a known method such as vacuum forming, pressure forming, press molding or the like.
- Preferred examples of the molded body of the electronic component packaging sheet include a container for storing electronic components, a carrier tape (embossed carry tape), and the like.
- the electronic component packaging sheet according to the present invention can obtain a molded product having extremely little fluff or burrs on its cross section when the sheet is slit or when a sprocket hole or the like is punched out. Especially, it is extremely effective in embossing of carrier tape. By using these moldings and secondary processing, it is possible to manufacture an embossed carrier tape having excellent dimensional accuracy such as slit width and punching hole diameter and significantly suppressing the generation of burrs during punching.
- the condition of punching is that the one-side clearance of the pin / die is 5. It is possible to obtain a sprocket hole with a stable hole diameter and significantly suppressed fluff and burrs by punching in a wide range of about 50 ⁇ m and a punching speed of 10 to 300 mm / sec. can. Further, even in the slit process using the ring-shaped combination blade, it is possible to obtain a slit end face having a stable sheet width with less fluff and burrs.
- the sheet for packaging electronic parts according to the present invention also has good moldability, it is possible to form a pocket having a desired shape when molding a pocket for storing electronic parts. Specifically, it is possible to form a pocket having a desired angle, which is necessary for stably storing electronic components, and there is no hole in the bottom or wall thereof.
- the container and embossed carrier tape according to the present invention are used as a carrier tape body in which electronic parts are stored in a storage portion formed by the above-mentioned molding method, covered with a cover tape, and wound into a reel shape. It can be used for storage and transportation.
- the base material layer A containing an ABS-based resin as a main component and the base material layer B containing a PC-based resin or a PS-based resin as a main component are alternately laminated.
- a base sheet having a multi-layered structure is provided, both surfaces of the base sheet are composed of the base layer A, and the thickness of each layer of the base layer A is 10 to 60 ⁇ m.
- the thickness of each layer of the base material layer B is 1 to 50 ⁇ m, and the average value of the thickness of each layer of the base material layer A exceeds the average value of the thickness of each layer of the base material layer B.
- Example 14 is an example of an electronic component packaging sheet having no conductive layer.
- the base material layer B was alternately laminated to prepare a base material sheet, and a sheet for packaging electronic components was obtained.
- the thickness and number of individual layers of the base material layers A and B, the thickness of the base material sheet, and the total thickness of the electronic parts packaging sheet of the obtained electronic component packaging sheet are as shown in Table 1. there were.
- a-1 Acrylonitrile-butadiene-styrene copolymer (ABS): manufactured by Denka Co., Ltd., product name "SE-10".
- a-2 Polycarbonate resin (PC): manufactured by Teijin Limited, product name "Panlite L-1225L”.
- a-3 Impact resistant polystyrene resin (HIPS): Made by Toyo Styrene Co., Ltd., product name "E640N”.
- b-1 Polycarbonate resin (PC): manufactured by Teijin Limited, product name "Panlite L-1225L”.
- b-2 Acrylonitrile-butadiene-styrene copolymer (ABS): manufactured by Denka Co., Ltd., product name "SE-10".
- the average primary particle size of acetylene black in the conductive layer is a value obtained by the following method.
- a dispersion sample was prepared by dispersing acetylene black in chloroform for 10 minutes under the conditions of 150 kHz and 0.4 kW using an ultrasonic disperser. This dispersed sample was sprinkled on a carbon-reinforced support film and fixed, and this was photographed with a transmission electron microscope (JEM-2100, manufactured by JEOL Ltd.).
- the particle size of 1000 or more inorganic fillers is randomly measured from an image magnified 50,000 to 200,000 times using an Ender device, and the average value is taken as the average primary particle size. did.
- the electronic component packaging sheet obtained in each example was cut in the extrusion direction of the sheet to prepare a sheet sample, and left for 24 hours in an atmosphere having a temperature of 23 ° C. and a relative humidity of 50%. Then, the formability and punching burr characteristics were evaluated under the following conditions.
- a sheet sample slit to a width of 8 mm is heated at a temperature of 23 ° C. and a relative humidity of 50% using a vacuum rotary molding machine (Muehlbauer, product name: "CT8 / 24"). Molding was performed under the condition of a temperature of 450 ° C. to prepare a carrier tape having a width of 8 mm.
- the pocket size of the carrier tape was 3 mm in the flow direction, 3 mm in the width direction, and 1 mm in the depth direction.
- the pocket of the obtained molded product was observed with a microscope, and the sharpness of the corner of the pocket (periphery of the bottom wall portion) was evaluated on a 5-point scale according to the evaluation criteria shown in FIG.
- the sharpness of the pocket angle 11 of the pocket 20 was visually confirmed, and it was evaluated which of the evaluation criteria 1 to 5 was applicable. In addition, the presence or absence of holes in the pocket 20 was visually confirmed. Based on these results, the moldability was evaluated according to the following criteria. Of the following criteria, good or better was regarded as acceptable (good moldability). ⁇ Judgment criteria> Yu: The sharpness of the pocket angle was 4 or higher, and there were no holes. Good: The sharpness of the pocket angle was 3 or more and less than 4 of the evaluation standard, and there was no hole. Impossible: There was a hole or there was no hole, but the sharpness of the corner of the pocket was 2 or less.
- the sheet punched holes formed above have 0% epi-illumination, 40% transmission, and 0% ring.
- the evaluation was made according to the following criteria, and a grade of good or better was judged as acceptable (the occurrence of burrs and fluff was suppressed).
- Good The number of burrs and fluff was 6 or more and less than 10.
- Impossible The number of burrs and fluff was 10 or more.
- the electronic component packaging sheets of Examples 1 to 14 satisfying the constitution of the present invention have good moldability and can effectively suppress the generation of fluff and burrs when the sheet is punched. Do you get it.
- the sheets for packaging electronic components of Comparative Examples 1 to 7, which do not satisfy the configuration of the present invention were inferior in either moldability or punching characteristics. From the above results, it was confirmed that the sheet for packaging electronic components according to the present invention can effectively suppress the generation of burrs and fluff while maintaining good moldability.
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Abstract
Description
すなわち、本発明は以下の態様を有する。
[1]基材層Aと、基材層Bとを交互に積層させた基材シートを備える電子部品包装用シートであって、前記基材層Aの個々の層の厚みが10~60μmであり、前記基材層Bの個々の層の厚みが1~50μmであり、前記基材層Aの個々の層の厚みの平均値が、前記基材層Bの個々の層の厚みの平均値超であり、前記基材層Aと前記基材層Bとが、異なる熱可塑性樹脂を主成分として含む、電子部品包装用シート。
[2]前記基材層Aと前記基材層Bとを交互に積層させた層数が3~70である、[1]に記載の電子部品包装用シート。
[3]前記基材層Aの個々の層の厚みの平均値が、前記基材層Bの個々の層の厚みの平均値の1.001倍以上である、[1]または[2]に記載の電子部品包装用シート。
[4]前記基材層AがABS系樹脂を主成分として含む、[1]から[3]のいずれか一項に記載の電子部品包装用シート。
[5]前記基材層BがABS系樹脂以外の熱可塑性樹脂を主成分として含む、[1]から[4]のいずれか一項に記載の電子部品包装用シート。
[6][1]から[5]のいずれか一項に記載の電子部品包装用シートを含んでなる、成形体。
[7]容器である、[6]に記載の成形体。
[8]キャリアテープである、[6]に記載の成形体。
[電子部品包装用シート]
本発明に係る電子部品包装用シート(以下、単に「シート」と記載することもある)は、基材層Aと、基材層Bとを交互に積層させた基材シートを備える電子部品包装用シートであって、前記基材層Aの個々の層の厚みが10~60μmであり、前記基材層Bの個々の層の厚みが1~50μmであり、前記基材層Aの個々の層の厚みの平均値が、前記基材層Bの個々の層の厚みの平均値超であり、前記基材層Aと前記基材層Bとが、異なる熱可塑性樹脂を主成分として含むことを特徴とする。本発明の電子部品包装用シートは、良好な成形性を維持しつつ、毛羽やバリの発生を効果的に抑制できる。
本発明に係る電子部品包装用シートは、基材シートを備える。基材シートは、基材層Aと基材層Bとを交互に積層させた、多層構造の基材シートである。このような多層構造の基材シートを備えることで、本発明に係る電子部品包装用シートは、バリや毛羽の発生を効果的に抑制することができる。また、電子部品包装用シートをキャリアテープ等に成形する際の成形性が低下せず、所望の形状のポケットを成形することができる。
基材層Aと基材層Bとを交互に積層させた層数、すなわち、基材シートの総積層数は、本発明の効果を有する限り特に限定されない。基材シート製膜時の各層の厚み制御の観点からは、前記総積層数は、3~70であることが好ましく、4~60であることがより好ましく、5~30であることがより好ましい。基材シートの総積層数が3~70であれば、バリや毛羽の発生を抑制しつつ、所望の厚みの基材シートが得られ易くなる。
1つの態様においては、基材層Aの総積層数が、基材層Bの総積層数よりも多いことが好ましい。基材層Aの総積層数が基材層Bの総積層数よりも多くなるように設計することで、基材シートの両表面を構成する樹脂層が、それぞれ基材層Aとなる。このような構成を有することにより、例えば、基材シートの両表面に導電層等のその他の層を設ける際に、基材シートとその他の層との密着性が良好となりやすい。
基材シートを構成する基材層A及び基材層Bは、異なる熱可塑性樹脂を主成分として含む。ここで、「主成分として含む」とは、基材層A又は基材層Bを構成する樹脂組成物(100質量%)中の熱可塑性樹脂の割合が、50質量%以上であることを意味する。1つの態様においては、基材層A又は基材層Bを構成する樹脂組成物中の熱可塑性樹脂の割合が100質量%であってもよい。また、「異なる熱可塑性樹脂」とは、熱可塑性樹脂の種類が異なるだけでなく、その物性が異なる熱可塑性樹脂も含まれる。すなわち、基材層Aと基材層Bとは、その種類が異なる熱可塑性樹脂を主成分として含むものであってもよく、物性の異なる、同一の熱可塑性樹脂を主成分として含むものであってもよい。基材シート製膜時に各層の厚みを確認しやすい観点から、基材層Aと基材層Bとは、その種類が異なる熱可塑性樹脂を主成分として含むことが好ましい。
熱可塑性樹脂としては、例えば、ポリスチレン系樹脂(PS系樹脂)、ABS系樹脂、ポリエステル系樹脂、ポリカーボネート系樹脂(PC系樹脂)、アクリロニトリル-スチレン2元共重合体(AS系樹脂)等が挙げられる。これら熱可塑性樹脂は、1種単独で用いられてもよく、2種以上を併用してもよい。
PS系樹脂としては、例えば、ポリスチレン樹脂、ゴム変性スチレン樹脂(ゴム-g-スチレン系樹脂(GPPS)又は耐衝撃性スチレン樹脂(HIPS))等が挙げられる。PS系樹脂は、1種単独で用いられてもよく、2種以上を併用してもよい。
PS系樹脂を形成するための芳香族ビニル単量体としては、例えば、スチレン、アルキル置換スチレン(例えば、ビニルトルエン、ビニルキシレン、p-エチルスチレン、p-イソプロピルスチレン、ブチルスチレン、p-t-ブチルスチレン等)、ハロゲン置換スチレン(例えば、クロロスチレン、ブロモスチレン等)、α位にアルキル基が置換したα-アルキル置換スチレン(例えば、α-メチルスチレンなど)等が挙げられる。これらの芳香族ビニル単量体は、1種単独で用いられてもよく、2種以上を併用してもよい。これらの単量体のうち、通常は、スチレン、ビニルトルエン、α-メチルスチレン等、特にスチレンが好ましく使用される。
PS系樹脂は、ISO 1133の規格に従って測定したMFRが、1~30g/10minが好ましく、2~25g/10minがより好ましい。
ABS系樹脂のISO 1133の規格に従って測定したMFRは、1~30g/10minが好ましく、2~25g/10minがより好ましい。
ポリエステル系樹脂のISO 1133の規格に従って測定したMFRは、1~30g/10minが好ましく、2~25g/10minがより好ましい。
PC系樹脂のISO 1133の規格に従って測定したMFRは、1~30g/10minが好ましく、2~25g/10minがより好ましい。
基材層Aに含まれるABS系樹脂の割合は、基材層Aを構成する樹脂組成物の総質量に対して、50質量%以上が好ましく、60~100質量%がより好ましく、75~100質量%が特に好ましい。また、前記ABS系樹脂としては、ブタジエンゴムの含有比率が5~30%のものが強度および成形性の観点からより好ましい。
基材層BがPC系樹脂を含む場合、基材層Bを構成する樹脂組成物中のPC系樹脂の割合は、前記樹脂組成物の総質量に対して、50質量%以上が好ましく、60~100質量%がより好ましく、75~100質量%が特に好ましい。
1つの態様においては、基材層AがABS系樹脂を主成分として含む層であり、基材層BがPC系樹脂を主成分として含む層であることが好ましい。
また、基材層AがABS樹脂を主成分として含む場合、基材層Bはアクリロニトリル-スチレンの2元共重合体を主成分として含んでもよい。
基材シートを構成する基材層Aの個々の層の厚みは10~60μmであり、15~50μmが好ましく、20~45μmがより好ましい。また、基材層Bの個々の層の厚みは1~50μmであり、5~40μmが好ましく、10~30μmがより好ましい。さらに、本発明に係る電子部品包装用シートにおいては、基材層Aの個々の層の厚みの平均値が基材層Bの個々の層の厚みの平均値超である。このように、異なる熱可塑性樹脂を主成分として含む、基材層A、Bを交互に積層させ、かつ基材層Aの個々の層の厚みの平均値を、基材層Bの個々の層の厚みの平均値超とすることにより、シート打ち抜き時のバリや毛羽の発生を効果的に抑制することが可能となる。なお、本明細書において「個々の層の厚み」とは、各層の厚みの最大値のことを指す。基材シート中の基材層A、Bの個々の層の厚みは、例えば、基材シートの断面を、マイクロスコープ等を用いて観察することにより確認できる。
基材シートに含まれる基材層Aの個々の層は、全て同じ厚みであってもよく、各層で厚みが異なっていてもよい。シートを巻いた時の巻き癖がつきにくい観点からは、基材層Aの個々の層は、全て同じ厚みであることが好ましい。同様に、基材層Bの個々の層は、全て同じ厚みであってもよく、各層で厚みが異なっていてもよいが、シートを巻いた時の巻き癖がつきにくい観点からは、基材層Bの個々の層は、全て同じ厚みであることが好ましい。
本発明に係る電子部品包装用シートは、前述の基材シートのみから構成されるものであってもよい。本発明に係る電子部品包装用シートを導電性シートとする場合は、前記基材シートの少なくとも一方の表面に導電層を形成することもできる。また、前記基材シートの上に、任意の層(例えば、防汚層等)を設けてもよい。
本発明に係る電子部品包装用シートは、前記基材シートの少なくとも一方の表面に導電層を備えていてもよい。導電層は、導電成分を含む樹脂組成物から構成される層である。
導電層を構成する樹脂組成物としては、本発明の効果を有する限り特に限定されない。例えば、樹脂組成物の総質量に対して、前述の熱可塑性樹脂を65~95質量%、好ましくは70~90質量%含み、カーボンブラック等の導電剤を5~35質量%、好ましくは10~30質量%含む樹脂組成物等が挙げられる。
カーボンブラックとしては、ファーネスブラック、チャンネルブラック、アセチレンブラック等が挙げられ、好ましくは比表面積が大きく、少ない添加量で高い導電性が得られるものである。具体的には、平均一次粒子径が、20~100nmのものが好ましく、25~65nmのものがより好ましい。前記平均一次粒子径は透過型電子顕微鏡を用いて測定した粒子の平均径のことを意味する。
導電層を設ける場合、その厚みは特に限定されない。電子部品包装用シートの機械強度が向上しやすい観点から、導電層の厚みは3~100μmが好ましく、10~50μmがより好ましい。
本発明に係る電子部品包装用シートの製造方法としては、一般的な多層シートの製造方法と同様の方法を用いることができる。例えば、特開2007-307893号公報に記載の方法等を採用できる。具体的には、基材層Aを形成する樹脂組成物、及び基材層Bを形成する樹脂組成物を、それぞれ個別の押出機に供給して溶融混錬し、フィードブロックに供給して、基材層Aと基材層Bとが交互に重なるように積層させる。この時、基材層Aの個々の層の厚みが10~60μmの範囲であり、基材層Bの個々の層の厚みが1~50μmの範囲であり、かつ基材層Aの個々の層の厚みの平均値が、基材層Bの個々の層の厚みの平均値超となるように押出量を調整しながら、好ましくは3~70層積層させて多層構造の基材シートを作成する。本発明の電子部品包装用シートを、導電性シートとする場合は、前記基材シートの片側、又は両方の表面に、別の押出機で溶融混錬した、導電層を形成する樹脂組成物を積層させて、電子部品包装用シートとすることができる。
本発明に係る電子部品包装用シートを、真空成型、圧空成形、プレス成形等公知の方法で成形することにより、成形体とすることができる。電子部品包装用シートの成形体としては、好ましくは、電子部品を収納するための容器、キャリアテープ(エンボスキャリテープ)等が挙げられる。本発明に係る電子部品包装用シートは、シートをスリットする際や、スプロケットホール等を打抜く際に、その断面に毛羽やバリの発生が極めて少ない成形体を得ることができる。特にキャリアテープのエンボス成形において極めて有力である。そしてこれらの成形および二次加工を用いることによって、スリット幅、打抜き穴径等の寸法精度に優れ、打抜きの際のバリの発生が著しく抑制されたエンボスキャリアテープを製造することができる。
(実施例1~13、比較例1~7)
実施例1~13、比較例1~7については、表1~2の基材層Aと基材層Bの組成に示す原料を準備し、実施例9、10については、更に同表に示す組成割合(質量%)となるように各々計量し、高速混合機により均一混合した。また、導電層としては、ポリカーボネート樹脂(帝人(株)製、製品名:「パンライト(登録商標)L-1225L」)80質量%と、アセチレンブラック(デンカ(株)製、製品名:「デンカブラック(登録商標)粒状」、平均一次粒子径:35nm)20質量%を、φ30mmベント式二軸押出機を用いて混練し、ストランドカット法によりペレット化した樹脂組成物を用いた。
まず、表1~2に記載の樹脂組成物と導電層の樹脂組成物を、φ65mm押出機(L/D=28)、φ50mm押出機(L/D=28)、φ40mm押出機(L/D=26)及び500mm幅のTダイを用いたフィードブロック法により、基材層Aと基材層Bとを交互に積層させた基材シートの両面に導電層を形成して、電子部品包装用シートを得た。なお、得られた電子部品包装用シートの、基材層A、Bの個々の層の厚み及びその層数、導電層の厚み、基材シートの厚み、及び電子部品包装用シートの総厚みは、表1~2に示す通りであった。
実施例14は導電層を有さない電子部品包装用シートの例である。
表1に記載の樹脂組成物を、φ65mm押出機(L/D=28)、φ50mm押出機(L/D=28)及び500mm幅のTダイを用いたフィードブロック法により、基材層Aと基材層Bとを交互に積層させて基材シートを作成し、電子部品包装用シートを得た。
得られた電子部品包装用シートの、基材層A、Bの個々の層の厚み及びその層数、基材シートの厚み、及び電子部品包装用シートの総厚みは、表1に示す通りであった。
a-1:アクリロニトリル-ブタジエン-スチレン共重合体(ABS):デンカ(株)製、製品名「SE-10」。
a-2:ポリカーボネート樹脂(PC):帝人(株)製、製品名「パンライトL-1225L」。
a-3:耐衝撃性ポリスチレン樹脂(HIPS):東洋スチレン(株)製、製品名「E640N」。
b-1:ポリカーボネート樹脂(PC):帝人(株)製、製品名「パンライトL-1225L」。
b-2:アクリロニトリル-ブタジエン-スチレン共重合体(ABS):デンカ(株)製、製品名「SE-10」。
まず、超音波分散機を用い、150kHz、0.4kWの条件でアセチレンブラックをクロロホルムに10分間分散させて、分散試料を調製した。この分散試料を、カーボン補強した支持膜に振り掛けて固定し、これを透過型電子顕微鏡(日本電子(株)製、JEM-2100)で撮影した。50000~200000倍に拡大した画像からEndterの装置を用いてランダムに1000個以上の無機フィラーの粒子径(球状以外の形状の場合は最大径)を測定し、その平均値を平均一次粒子径とした。
各例で得られた電子部品包装用シートを、シートの押出方向でカットしてシートサンプルを作成し、温度23℃、相対湿度50%の雰囲気化で24時間放置した。その後、以下の条件で成形性、打ち抜きバリ特性を評価した。
8mm幅にスリットしたシートサンプルを温度23℃、相対湿度50%の雰囲気下にて、真空ロータリー成形機(Muehlbauer社製、製品名:「CT8/24」)を用いて、ヒーター温度450℃の条件で成形を行い、8mm幅のキャリアテープを作成した。キャリアテープのポケットサイズは、流れ方向3mm、幅方向3mm、深さ方向1mmであった。得られた成形体のポケットを顕微鏡で観察し、ポケットの角(底壁部の周縁)のシャープさを、図1に示す評価基準に従って5段階で評価した。すなわち、成形体(キャリアテープ)10において、ポケット20のポケット角11のシャープさを目視で確認し、評価基準1~5のいずれに該当するか評価を行った。また、ポケット20の穴空きの有無を目視で確認した。これらの結果に基づき、下記の判定基準で成形性を評価した。以下の判定基準のうち、良以上を合格(成形性が良好である)とした。
<判定基準>
優:ポケット角のシャープさが評価基準4以上であり、且つ、穴空きが無かった。
良:ポケット角のシャープさが評価基準3以上4未満であり、且つ、穴空きが無かった。
不可:穴空きがあった、又は穴空きが無いが、ポケットの角のシャープさが2以下であった。
8mm幅にスリットしたシートサンプルを温度23℃、相対湿度50%の雰囲気下にて、真空ロータリー成形機(Muehlbauer社製、製品名:「CT8/24」)を用いて打抜き、打ち抜き穴のバリ、毛羽を評価した。なお、打抜きは、スプロケットホールピン先端径1.5mmの円柱状打抜きピンと、直径1.58mmのダイ穴とを備える打抜き装置を用い、240m/hの速度で行った。
上記で形成したシート打抜き穴を、顕微測定機(ミツトヨ(株)製、製品名「MF-A1720H(画像ユニット6D)」)を用いて、落射が0%、透過が40%、リングが0%の光源環境で撮影した。直径1.5mmの穴を10箇所観察して、0.15mm以上の長さのバリ、毛羽の個数を数えた。また以下の判定基準に沿って評価し、良以上を合格(バリ、毛羽の発生が抑制されている)とした。
<判定基準>
優:バリ、毛羽の個数が6個未満であった。
良:バリ、毛羽の個数が6個以上10個未満であった。
不可:バリ、毛羽の個数が10個以上であった。
11 ポケット角
20 ポケット
Claims (8)
- 基材層Aと、基材層Bとを交互に積層させた基材シートを備える電子部品包装用シートであって、
前記基材層Aの個々の層の厚みが10~60μmであり、前記基材層Bの個々の層の厚みが1~50μmであり、前記基材層Aの個々の層の厚みの平均値が、前記基材層Bの個々の層の厚みの平均値超であり、
前記基材層Aと前記基材層Bとが、異なる熱可塑性樹脂を主成分として含む、電子部品包装用シート。 - 前記基材層Aと前記基材層Bとを交互に積層させた層数が3~70である、請求項1に記載の電子部品包装用シート。
- 前記基材層Aの個々の層の厚みの平均値が、前記基材層Bの個々の層の厚みの平均値の1.001倍以上である、請求項1または2に記載の電子部品包装用シート。
- 前記基材層AがABS系樹脂を主成分として含む、請求項1から3のいずれか一項に記載の電子部品包装用シート。
- 前記基材層BがABS系樹脂以外の熱可塑性樹脂を主成分として含む、請求項1から4のいずれか一項に記載の電子部品包装用シート。
- 請求項1から5のいずれか一項に記載の電子部品包装用シートを含んでなる、成形体。
- 容器である、請求項6に記載の成形体。
- キャリアテープである、請求項6に記載の成形体。
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WO2012046807A1 (ja) * | 2010-10-07 | 2012-04-12 | 電気化学工業株式会社 | 表面導電性多層シート |
WO2012099068A1 (ja) * | 2011-01-17 | 2012-07-26 | 電気化学工業株式会社 | スチレン系樹脂多層シート |
WO2014188954A1 (ja) * | 2013-05-21 | 2014-11-27 | 東レ株式会社 | 積層フィルムおよび偏光板 |
JP2015047856A (ja) * | 2013-09-05 | 2015-03-16 | 電気化学工業株式会社 | 積層シートおよびこれを用いた容器 |
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