WO2012026119A1 - 形状保持フィルム及びその製造方法、積層フィルム・テープ、粘着フィルム・テープ、異方性熱伝導フィルム、並びに形状保持繊維 - Google Patents
形状保持フィルム及びその製造方法、積層フィルム・テープ、粘着フィルム・テープ、異方性熱伝導フィルム、並びに形状保持繊維 Download PDFInfo
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- WO2012026119A1 WO2012026119A1 PCT/JP2011/004709 JP2011004709W WO2012026119A1 WO 2012026119 A1 WO2012026119 A1 WO 2012026119A1 JP 2011004709 W JP2011004709 W JP 2011004709W WO 2012026119 A1 WO2012026119 A1 WO 2012026119A1
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- shape
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- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/02—Yarns or threads characterised by the material or by the materials from which they are made
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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
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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
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
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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
- B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
- B65D31/02—Bags or like containers made of paper and having structural provision for thickness of contents with laminated walls
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/28—Formation of filaments, threads, or the like while mixing different spinning solutions or melts during the spinning operation; Spinnerette packs therefor
- D01D5/30—Conjugate filaments; Spinnerette packs therefor
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/42—Formation of filaments, threads, or the like by cutting films into narrow ribbons or filaments or by fibrillation of films or filaments
- D01D5/426—Formation of filaments, threads, or the like by cutting films into narrow ribbons or filaments or by fibrillation of films or filaments by cutting films
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F6/00—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof
- D01F6/02—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D01F6/04—Monocomponent artificial filaments or the like of synthetic polymers; Manufacture thereof from homopolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds from polyolefins
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- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/02—Yarns or threads characterised by the material or by the materials from which they are made
- D02G3/04—Blended or other yarns or threads containing components made from different materials
- D02G3/045—Blended or other yarns or threads containing components made from different materials all components being made from artificial or synthetic material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/36—Selection of materials, or shaping, to facilitate cooling or heating, e.g. heatsinks
- H01L23/373—Cooling facilitated by selection of materials for the device or materials for thermal expansion adaptation, e.g. carbon
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- D—TEXTILES; PAPER
- D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
- D10B2401/00—Physical properties
- D10B2401/04—Heat-responsive characteristics
- D10B2401/046—Shape recovering or form memory
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/10—Bump connectors; Manufacturing methods related thereto
- H01L2224/15—Structure, shape, material or disposition of the bump connectors after the connecting process
- H01L2224/16—Structure, shape, material or disposition of the bump connectors after the connecting process of an individual bump connector
- H01L2224/161—Disposition
- H01L2224/16151—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/16221—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/16225—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
- H01L2224/31—Structure, shape, material or disposition of the layer connectors after the connecting process
- H01L2224/32—Structure, shape, material or disposition of the layer connectors after the connecting process of an individual layer connector
- H01L2224/321—Disposition
- H01L2224/32151—Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/32221—Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/32225—Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/73—Means for bonding being of different types provided for in two or more of groups H01L2224/10, H01L2224/18, H01L2224/26, H01L2224/34, H01L2224/42, H01L2224/50, H01L2224/63, H01L2224/71
- H01L2224/732—Location after the connecting process
- H01L2224/73201—Location after the connecting process on the same surface
- H01L2224/73203—Bump and layer connectors
- H01L2224/73204—Bump and layer connectors the bump connector being embedded into the layer connector
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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
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
- Y10T428/2495—Thickness [relative or absolute]
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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
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31855—Of addition polymer from unsaturated monomers
- Y10T428/31909—Next to second addition polymer from unsaturated monomers
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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
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31855—Of addition polymer from unsaturated monomers
- Y10T428/31909—Next to second addition polymer from unsaturated monomers
- Y10T428/31913—Monoolefin polymer
- Y10T428/3192—Next to vinyl or vinylidene chloride polymer
Definitions
- the present invention relates to a shape-retaining film and a production method thereof, a laminated film / tape, an adhesive film / tape, an anisotropic heat conductive film, and a shape-retaining fiber.
- -Containers for foods such as cup ramen and pudding are required to be able to hold the opened shape when the lid is opened and to retain the closed shape when the lid is closed (shape retention).
- aluminum or the like is used as a lid material used for such a container.
- aluminum is considered to be a resin shape-retaining film because it takes time and labor to separate and cannot be used for products that are heated in a microwave by putting water in a container.
- a film obtained by uniaxially stretching polyethylene has been proposed (for example, see Patent Document 1).
- the uniaxially stretched film of polyethylene will be used as an easily tearable film for food packaging in addition to the shape-retaining film (see, for example, Patent Document 2).
- the shape-retaining fiber is required to have higher shape-retaining properties, and an appropriate elastic modulus, thermal conductivity, and the like according to its use.
- a shape-retaining fiber used as a fiber constituting a woven fabric is required to have a modulus of elasticity that allows knitting.
- the shape retention fiber may be required to have high thermal conductivity.
- Carbon fibers, ultra-high molecular weight polyethylene fibers, etc. are known as highly heat conductive fibers. However, these are not only expensive, but also very high elastic fibers and are difficult to weave as woven fabrics.
- inexpensive general-purpose polyethylene has a low intrinsic viscosity [ ⁇ ] and is considered to be a low elastic modulus fiber, but has poor melt spinnability.
- general-purpose polyethylene is sometimes used as a core material or sheath material of a core-sheath structure fiber, but it is generally difficult to form a fiber by itself.
- the core-sheath fiber having a sheath material made of polyethylene is not sufficient, although it has a certain thermal conductivity, and the core material or the sheath material made of polyethylene as the sheath material is given shape retention. It is difficult.
- the subject of the first invention is a shape-retaining film having excellent shape retention, high tensile elastic modulus and good longitudinal tear resistance, laminated film and tape using the same, adhesive film It is providing the manufacturing method of a film tape, an anisotropic heat conductive film, and the said shape maintenance film.
- the place made into the subject of 2nd invention provides the shape retention fiber which is excellent in shape retentivity, has a tensile elastic modulus in the range which can be knitted as a textile fabric, and has high thermal conductivity. There is to do.
- the following shape-retaining film, method for producing the shape-retaining film, laminated tape, anisotropic heat conductive film, and shape-retaining fiber are provided.
- At least one base layer including an ethylene polymer having a density of 900 kg / m 3 or more and a weight average molecular weight (Mw) / number average molecular weight (Mn) of 5 to 20, and a polymer material
- the polymer material has a melting point Tm2 lower than the melting point Tm1 of the ethylene polymer, a tensile elastic modulus of 10 to 50 GPa, and a return angle by a 180 ° bending test of 65 ° or less. Holding film.
- [11] The method for producing a shape-retaining film according to any one of [1] to [10], wherein the density is 900 kg / m 3 or more, and the weight average molecular weight (Mw) / number average molecular weight (Mn) Comprising at least one base layer containing an ethylene polymer having a molecular weight of 5 to 20, and at least one soft layer containing a polymer material, wherein the ethylene polymer is an ethylene homopolymer or a carbon number of 3 Is an ethylene- ⁇ -olefin copolymer having an ⁇ -olefin unit content of less than 2% by weight, and the polymer material has a melting point Tm2 lower than the melting point Tm1 of the ethylene polymer.
- a method for producing a shape-retaining film comprising: a first step of obtaining a film; and a second step of stretching the raw film so that a stretching ratio is 10 to 30 times.
- a laminated tape comprising: the shape-retaining film according to any one of [1] to [10]; and an adhesive layer disposed on a part or all of at least one surface of the shape-retaining film.
- At least one base material layer containing an ethylene polymer having a density of 900 kg / m 3 or more and a weight average molecular weight (Mw) / number average molecular weight (Mn) of 5 to 20, and a polymer material
- the melting point Tm2 of the polymer material is lower than the melting point Tm1 of the ethylene polymer, the tensile elastic modulus in the fiber direction is 10 to 50 GPa, and the return angle by the 90 ° bending test with respect to the fiber direction is 35.
- the shape-retaining film of the present invention has excellent shape-retaining properties, a high tensile elastic modulus, and good longitudinal tear resistance.
- the shape-retaining fiber of the present invention is excellent in shape retaining property, has a tensile elastic modulus within a range that can be knitted as a woven fabric, and has a high thermal conductivity.
- Shape-holding film comprises at least one base material layer containing a specific ethylene polymer, and a polymer material (low melting point material) whose melting point is lower than the melting point of the ethylene polymer. And at least one soft layer.
- base material layer containing a specific ethylene polymer
- polymer material low melting point material
- the base material layer contains a specific ethylene polymer.
- the base material layer is preferably a layer made of an ethylene polymer.
- This ethylene polymer is an ethylene homopolymer or an ethylene- ⁇ -olefin copolymer. Moldability can be improved by copolymerizing a small amount of ⁇ -olefin with ethylene.
- the ⁇ -olefin copolymerized with ethylene is an ⁇ -olefin having 3 to 6 carbon atoms. Examples of the ⁇ -olefin having 3 to 6 carbon atoms include propylene, 1-butene, 1-hexene and the like, preferably propylene.
- the proportion of ⁇ -olefin units contained in the ethylene- ⁇ -olefin copolymer is less than 2% by weight, preferably 0.05 to 1.5% by weight.
- the density of the ethylene-based polymer is 900 kg / m 3 or more, preferably 930 kg / m 3 or more, more preferably 950 kg / m 3 or more, and general-purpose high-density polyethylene (HDPE) may be used.
- HDPE general-purpose high-density polyethylene
- the density is less than 900 kg / m 3 , it becomes difficult to obtain shape retention by stretching.
- the density is too high, it becomes difficult to form a film by melt film formation. Therefore, the upper limit of the density of the ethylene polymer is not particularly limited, but is substantially about 970 to 980 kg / m 3 .
- a base material layer is a layer which consists of ethylene-type polymers
- the density of an ethylene-type polymer is a density of a base material layer.
- the density of the ethylene polymer (base material layer) can be measured using ethanol / water as the immersion liquid in accordance with JIS K7112 D method.
- the ratio (Mw / Mn) of the weight average molecular weight (Mw) and the number average molecular weight (Mn) representing the molecular weight distribution of the ethylene polymer is 5 to 20, preferably 6 to 16, more preferably 7 to 14. is there. If the molecular weight distribution is too narrow, the stretchability is lowered, so that it becomes difficult to stretch at a high stretch ratio. On the other hand, if the molecular weight distribution is too wide, the amount of low molecular weight components increases, so that the mechanical strength of the resulting film may be lowered, or the stretching machine may be contaminated to reduce the productivity.
- the molecular weight distribution (Mw / Mn) of the ethylene polymer can be measured by gel permeation chromatography (GPC).
- the melt flow rate (MFR) of an ethylene polymer at 190 ° C. and a load of 2160 g is preferably 0.1 to 3.0 g / 10 min, more preferably 0.5 to 1.5 g / 10 min.
- MFR of the ethylene-based polymer is within the above numerical range, a film having a uniform film thickness is easily obtained because it has appropriate fluidity during melt film formation.
- Such an ethylene polymer having a relatively high density and an appropriate molecular weight distribution is easy to be formed into a film and can be highly stretched, so that excellent shape retention is easily obtained.
- the base material layer may further contain a thermoplastic resin other than the above ethylene-based polymer or may further contain various additives as long as the effects of the present invention are not impaired.
- various additives include color pigments, inorganic fillers, antioxidants, neutralizing agents, lubricants, antistatic agents, antiblocking agents, water resistance agents, water repellent agents, antibacterial agents, processing aids (wax etc.) Etc. are included.
- inorganic fillers include glass fiber, glass beads, talc, silica, mica, calcium carbonate, magnesium hydroxide, alumina, zinc oxide, magnesium oxide, magnesium hydroxide, aluminum hydroxide, titanium oxide, calcium oxide, and calcium silicate.
- the processing aid is, for example, a wax such as a low molecular weight polyolefin or an alicyclic polyolefin.
- the content ratio of the processing aid and the antistatic agent can be, for example, 5% by weight or less, preferably 1% by weight or less.
- the content of the inorganic filler and the color pigment can be, for example, 10% by weight or less, preferably 5% by weight or less.
- the soft layer includes a polymer material.
- the soft layer is preferably a layer made of a polymer material.
- the melting point Tm2 of the polymer material is lower than the melting point Tm1 of the ethylene polymer constituting the base material layer.
- the melting point Tm2 of the polymer material is preferably 5 ° C. or more lower than the melting point Tm1 of the ethylene polymer, and more preferably 40 ° C. or more. If the difference between the melting point Tm2 of the polymer material and the melting point Tm1 of the ethylene polymer is too small, it becomes difficult to improve the longitudinal tear resistance of the resulting shape-retaining film. Further, as will be described later, the base material layer is difficult to melt, and the soft layer tends to be difficult to uniaxially stretch at a temperature at which it is easy to melt.
- fusing point Tm2 of a polymeric material is 125 degrees C or less normally, Preferably it is 90 degrees C or less.
- polymer material examples include hydrocarbon plastics, vinyl plastics, and thermoplastic elastomers. These polymer materials can be used singly or in combination of two or more.
- hydrocarbon plastics include polyethylene, polypropylene, polybutene, polystyrene, polybutadiene and the like.
- vinyl plastic include polyvinyl chloride, polyvinyl acetate, polyvinylidene chloride, ethylene vinyl acetate copolymer, polymethyl methacrylate and the like.
- thermoplastic elastomer include styrene / butadiene, polyolefin, urethane, polyester, polyamide, polyvinyl chloride, and ionomer.
- the polymer material preferably has a melting point close to that of the ethylene polymer constituting the base material layer.
- polyethylene, ethylene vinyl acetate copolymer, and polyolefin-based thermoplastic elastomer are preferable.
- the polymer material has a molecular structure that is close to the molecular structure of the ethylene polymer constituting the base material layer.
- polyethylene, ethylene vinyl acetate copolymer, and polyolefin-based thermoplastic elastomer are preferable.
- the polymeric material which has tackiness is preferable.
- polyethylene, ethylene vinyl acetate copolymer, and polyolefin-based thermoplastic elastomer are preferable.
- thermoplastic elastomer is preferable as the polymer material.
- ⁇ is obtained by copolymerizing at least two ⁇ -olefins selected from the group consisting of ethylene, propylene, 1-butene, and 1-hexene.
- -Olefin copolymers are preferred.
- the ⁇ -olefin copolymer is preferably an ethylene / ⁇ -olefin copolymer, a propylene / ⁇ -olefin copolymer, or an ethylene / propylene copolymer.
- the ⁇ -olefin copolymer to be copolymerized with ethylene or propylene has 4 to 6 carbon atoms.
- the ⁇ -olefin copolymer includes an ethylene / propylene copolymer, an ethylene / 1-butene copolymer, an ethylene / 1-hexene copolymer, a propylene / 1-butene copolymer, a propylene / More preferred are 1-hexene copolymer and 1-butene / 1-hexene copolymer. More specifically, the trade name “Tuffmer A” (registered trademark, manufactured by Mitsui Chemicals) and the trade name “Toughmer P” (registered trademark, manufactured by Mitsui Chemicals) can be exemplified.
- the soft layer may further contain a thermoplastic resin other than the above polymer material as long as the effects of the present invention are not impaired, and may further contain various additives. Specific examples of various additives and the content ratios thereof are the same as in the case of the above-described base material layer.
- the shape-retaining film of the present invention has the aforementioned base material layer and soft layer.
- the base material layer and the soft layer may be laminated via an adhesive layer, or may be laminated directly without interposing an intermediate layer such as an adhesive layer.
- the shape maintaining film has two base layers and a laminate in which a soft layer is sandwiched between two base layers (for example, the base layer (A) and the base layer (B)). It is good. Such a three-layered laminate is preferred because defects such as a soft layer sticking to the roll during stretching are unlikely to occur and manufacturing efficiency is increased.
- the kind of ethylene polymer which comprises these two base material layers may be the same, or may differ.
- the shape-retaining film of the present invention exhibits excellent shape-retaining properties in a base material layer containing an ethylene polymer, and combines this base material layer with a soft layer containing a polymer material (low-melting-point material) ( By laminating), excellent vertical tear resistance is expressed.
- a low melting point material or the like is added to the constituent material of the film in order to impart longitudinal resistance to the shape-retaining film, the longitudinal resistance to the resulting film is improved while the shape-retaining ability is improved. It tends to be damaged.
- the shape-retaining film of the present invention the low melting point material is not blended (mixed) into the constituent material of the base material layer, but the soft layer containing the low melting point material and the base material layer are laminated. ing. Thereby, the shape-retaining film of the present invention is maintained at a high level without impairing the shape-retaining property while significantly improving the vertical tear resistance.
- the total thickness of the soft layer is preferably 5 to 40%, more preferably 10 to 35%, and particularly preferably 15 to 30% of the total thickness of the base material layer.
- the thickness of the shape maintaining film is preferably 20 to 100 ⁇ m, more preferably 25 to 70 ⁇ m.
- a shape-retaining film obtained by stretching (preferably uniaxially stretching) an original film having a base material layer and a soft layer as described above at a high stretch ratio of a certain level or higher has a high tensile elastic modulus.
- the tensile modulus of the shape-retaining film is preferably 10 to 50 GPa, more preferably 13 to 50 GPa. If the tensile modulus of the shape-retaining film is less than 10 GPa, it is difficult to obtain sufficient shape-retaining properties. On the other hand, if the tensile elastic modulus exceeds 50 GPa, the film may become brittle.
- the tensile elastic modulus of the shape retaining film can be adjusted by the draw ratio. For example, if the draw ratio is increased, the tensile elastic modulus of the shape retaining film can be increased.
- the shape-retaining film obtained by stretching (preferably uniaxially stretching) a raw film having a base material layer and a soft layer as described above at a stretch ratio higher than a certain value is preferably tensile in the stretching direction (X direction).
- the elastic modulus is high, and the tensile elastic modulus in the direction substantially perpendicular to the X direction (Y direction) is low.
- the shape maintaining film is a uniaxially stretched film
- the X direction is a uniaxially stretched direction
- the Y direction is a direction substantially orthogonal to the uniaxially stretched direction.
- substantially orthogonal means that the crossing angle is substantially 90 °, and includes not only 90 ° but also a range slightly deviated from 90 °.
- the stretching direction of the shape-retaining film of the present invention can be confirmed as the direction in which the molecular chain of the polyethylene polymer is observed with, for example, an optical microscope.
- the tensile elastic modulus in the X direction (high tensile elastic modulus direction) of the shape retaining film is preferably 10 to 50 GPa, more preferably 13 to 40 GPa.
- the shape-retaining film can be suitably used as an anisotropic heat conductive film described later.
- the tensile elastic modulus in the X direction is less than 10 GPa, it is difficult to obtain sufficient shape retention and high thermal conductivity.
- the tensile modulus in the X direction exceeds 50 GPa, the film may become brittle.
- the tensile elastic modulus in the Y direction (low tensile elastic modulus direction) of the shape maintaining film is preferably 6 GPa or less. If it exceeds 6 GPa, the thermal conductivity in the Y direction relative to the thermal conductivity in the X direction becomes relatively high, and the anisotropy of the thermal conductivity decreases, making it difficult to use as an anisotropic thermal conductive film described later. .
- the tensile elastic modulus in the Y direction of the shape-retaining film depends on the type of resin contained as the main component in the shape-retaining film, and does not change greatly depending on the stretch ratio (in the X direction).
- the tensile elastic modulus of the shape-retaining film can be measured by a method based on JIS K7161. That is, the shape-retaining film is cut to prepare a strip-shaped test piece having a width (direction orthogonal to the extending direction of the molecular chain of polyethylene) of 10 mm and a length (extending direction of the molecular chain of polyethylene) of 120 mm; What is necessary is just to measure the tensile elasticity modulus of a test piece on the conditions of temperature 23 degreeC, the distance between chuck
- the shape-retaining film of the present invention Since the shape-retaining film of the present invention has a high tensile elastic modulus, it has excellent shape-retaining properties.
- the return angle of the shape maintaining film by a 180 ° bending test is 65 ° or less, and preferably 50 ° or less.
- the lower limit value of the return angle is not particularly limited, but is substantially about 5 °.
- the return angle of the shape-retaining film by the 180 ° bending test can be measured as follows. That is, (1) a sample piece having a width (direction orthogonal to the stretching direction) of 10 mm and a length (stretching direction) of 50 mm is prepared, and (2) the sample piece is 180 ° along the lower surface, the end surface, and the upper surface of the plate. Hold the bent state for about 30 seconds (see FIG. 1A), (3) measure the angle ⁇ between the sample piece and the upper surface of the plate 30 seconds after releasing the bent state (see FIG. 1). (See (B)).
- the 180 ° return angle can be measured under conditions of a temperature of 23 ° C. and a humidity of 55% RH.
- the shape-retaining film of the present invention has excellent longitudinal tear resistance.
- the tear strength of the shape-retaining film of the present invention (the force required for tearing substantially parallel to the direction in which the polyethylene molecular chain extends) is preferably 50 mN or more, and more preferably 200 mN or more.
- the upper limit of the tear strength is not particularly limited and is preferably as high as possible, but is substantially about 2000 mN.
- a slit of 20 mm in length was put in a film piece of dimensions: 63 mm width ⁇ 75 mm length
- What is necessary is just to measure the force required when the test piece which piled up 16 sheets was torn apart in parallel with the extending direction of the molecular chain of polyethylene.
- a shape-retaining film according to the present invention comprises: (1) an original film provided with at least one base layer containing an ethylene polymer and at least one soft layer containing a polymer material. And (2) a second process of stretching (preferably uniaxially stretching) the original film so that the stretching ratio is 10 to 30 times. .
- the raw film can be obtained, for example, by melting and kneading the raw materials constituting the base material layer and the soft layer with an extruder, discharging from a die, and then cooling and solidifying with a cooling roll.
- the temperature of the cooling roll may be any temperature that can solidify the molten resin to some extent, and is, for example, about 80 to 120 ° C.
- the thickness of the raw film is, for example, about 200 to 1000 ⁇ m.
- the obtained raw film is fed to a roll stretching machine, preheated with a preheating roll, and then stretched in the MD direction.
- Stretching is preferably tensile uniaxial stretching.
- “Uniaxial stretching” in the present specification means stretching in a uniaxial direction, but may be stretched in a direction different from the uniaxial direction to the extent that the effects of the present invention are not impaired. This is because, depending on the stretching equipment used, even if it is intended to stretch in the uniaxial direction, it may be substantially stretched in a direction different from the uniaxial direction.
- the draw ratio is 10 times or more, preferably 15 to 30 times. When the draw ratio is lower than 10 times, the tensile elastic modulus is not sufficiently increased, and sufficient shape retention cannot be obtained.
- the preheating temperature by the preheating roll is not particularly limited as long as the raw sheet can be softened suitable for stretching, and can be set to 120 to 140 ° C., for example.
- the temperature during stretching is preferably a temperature that is (2) above the melting point Tm2 of the polymer material contained in the soft layer and (1) below the melting point Tm1 of the ethylene polymer contained in the substrate layer. If the temperature during stretching is lower than the melting point Tm2 of the polymer material contained in the soft layer, the soft soft layer will not melt and it will be difficult to stretch the original film to a magnification that can provide sufficient shape retention. . On the other hand, when the temperature at the time of stretching is higher than the melting point Tm1 of the ethylene polymer contained in the base material layer, the molecular chain of the ethylene polymer cannot be stretched substantially parallel to the stretching direction by stretching, The shape retention of the film after stretching cannot be improved.
- the stretching can be performed, for example, by providing a difference in peripheral speed between the preheating roll immediately before stretching and the stretching roll while heating the raw film at 120 to 140 ° C.
- the stretching speed is not particularly limited, but can be 100 to 1000% / second.
- stretching may be roll heating or optical heating, optical heating is preferable from the point which makes it easy to heat uniformly in the thickness direction of a film.
- the light heating can be performed by irradiating the surface of the original film with light from a light source.
- the light source is preferably one that can be heated as uniformly as possible in the thickness direction of the original film, for example, a halogen lamp, a laser, a far-infrared heater, or the like that has many wavelength components in the near infrared region.
- the light applied to the raw film is condensed to 1 cm or less in the MD direction (stretching direction) by a curved reflector or the like, and the TD direction ( It is preferable to heat linearly in the width direction).
- a pinch roll against the preheating roll and the stretching roll, respectively.
- the annealing treatment can be performed by bringing the stretched sheet into contact with a heating roll.
- the shape retaining film of the present invention has excellent shape retentivity.
- the shape-retaining film of the present invention is preferably used as various packaging materials, particularly food packaging materials.
- the food packaging material may be a lid for sealing containers such as cup ramen and pudding, or may be a bag material for packaging snacks, retort foods and the like.
- an adhesive layer In addition, an adhesive layer, an adhesive layer, a heat seal layer, a heat-insulating layer, a heat-resistant layer, a weather-resistant (light-resistant) layer, a chemical-resistant layer, a gas barrier layer, a cushion layer, and a printing layer are formed on a part or all of at least one surface of the shape-retaining film.
- Conductive film, release (release) layer, light reflection layer, photocatalyst layer, foam, paper, wood, nonwoven fabric, metal, ceramic, etc. preferable.
- the adhesive film and tape in which the adhesive layer is arranged make use of the excellent shape retention and longitudinal tear resistance of the shape retention film of the present invention.
- shrink tape and packaging tape Binding tape (for wire harness binding, etc.), packaging tape, office tape, household goods tape (for paper diapers, sports, etc.), masking tape (for painting, curing, etc.), surface protection tape (optical) , Protective film for FPC, etc.), anticorrosion tape, electrical insulation tape, double-sided tape, medical tape (such as adhesive bandage), tape for electrical and electronic equipment, identification tape, decorative tape (for media, graphic display) , For marking, etc.), tape for construction and building materials (for heat ray shielding, for soundproofing, for preventing glass scattering), automotive tape, heat conduction tape Flop (heat radiation tape, etc.), can be used labels, the seal or the like.
- the shape-retaining film of the present invention Since the shape-retaining film of the present invention has excellent shape-retaining properties and longitudinal tear resistance, it is suitable as packaging materials for foods, detergents, etc., and various refilling packaging materials. Furthermore, if it is a packaging material which does not contain metal foils, such as aluminum foil, it is suitable also as a packaging material for the heating cooking in a microwave oven.
- the packaging material is a bag-like body or a cylindrical body containing the shape-retaining film described above.
- the form of the bag is not particularly limited, and pillows used for standing pouches (self-supporting packaging bags) used for coffee, tea leaves, ramen, etc., retort foods, shampoos, snacks, etc. Includes packaging.
- FIG. 2 is a perspective view showing an example of a bag-shaped packaging material.
- the opening surface P of the packaging material 15 is provided so as to intersect (preferably substantially orthogonally) with the extending direction of the shape maintaining film constituting the packaging material.
- the opening surface P of the packaging material 15 is a plane including the opening 15A.
- substantially orthogonal includes not only the case where the crossing angle is 90 ° but also a range slightly deviated from 90 °.
- the shape retaining film constituting the packaging material 15 exhibits high shape retaining properties in a direction parallel to the stretching direction. For this reason, by forming the opening 15A of the packaging material 15 so that the opening surface P thereof is preferably substantially orthogonal to the stretching direction of the shape-retaining film, the packaging material 15 can be placed in a self-standing state, or the opening A bag can be closed only by bending 15A.
- Such a packaging material includes (1) a step of preparing a shape-retaining film, (2) a step of overlapping shape-retaining films, or a step of overlapping a shape-retaining film and another film (sheet), 3) Obtaining a packaging material by sealing a part of the overlapped shape-retaining film.
- the other film (sheet) may be, for example, a thermoplastic resin sheet.
- the method of superimposing the shape-retaining films includes a method of folding and overlapping one shape-retaining film; and a method of laminating two shape-retaining films.
- the seal may be an adhesive seal or a heat seal, but is preferably a heat seal.
- the heat sealing temperature may be any temperature that allows the shape-retaining films or the shape-retaining film and another film (sheet) to be bonded to each other.
- the seal strength can be adjusted by the heat seal temperature, the number of heat seals, the heat seal time, and the like.
- the heat sealing method may be a known method, such as a bar seal, a rotary roll seal, an impulse seal, a high frequency seal, and an ultrasonic seal.
- the packaging material containing the shape-retaining film of the present invention has high shape-retaining properties and longitudinal tear resistance. For this reason, it can be placed in a self-standing state, or the bag can be closed simply by bending the opening of the bag.
- the gas barrier layer may be a metal layer or a resin layer, but is preferably an aluminum foil layer in terms of light weight and high gas barrier properties.
- the thickness of the aluminum foil layer may be such that gas barrier properties can be obtained, and can be about 5 to 20 ⁇ m.
- the resin constituting the protective layer is not particularly limited, but is preferably polyester, polyethylene, polypropylene, nylon, or the like from the viewpoint of improving printability and strength.
- the polyester is preferably polyethylene terephthalate (PET)
- the polypropylene is preferably biaxially oriented polypropylene (OPP)
- the nylon is preferably biaxially oriented nylon (ONy).
- a biaxially stretched PET film is preferably used as the protective layer.
- the biaxially stretched PET film has a high impact resilience (spring back property)
- the shape retaining property tends to be impaired if the thickness is increased.
- biaxially stretched polypropylene film (OPP) has high rigidity but low rebound resilience, so that the rigidity and bag-breaking resistance of the shape-holding film can be improved without impairing the shape-holding property.
- the shape retention film excellent in rigidity and mechanical strength can be obtained, including shape retention, by including a biaxially stretched polypropylene film and making the biaxially stretched PET film as thin as possible.
- the protective layer may be a single layer or multiple layers.
- the thickness of the protective layer can be about 5 to 20 ⁇ m for polyester and about 10 to 30 ⁇ m for polypropylene.
- the resin constituting the heat seal layer may be linear low density polyethylene (LLDPE), low density polyethylene (LDPE), unstretched polypropylene (CPP), ionomer, polystyrene, or the like.
- the thickness of the heat seal layer is preferably 10 to 70 ⁇ m.
- the shape-retaining film used for the packaging material preferably includes a layer (shape-retaining film layer) made of a shape-retaining film and a protective layer, and preferably further includes a gas barrier layer, depending on the application.
- the shape retaining film layer may be disposed on the outermost surface or may be disposed in the middle, but is preferably disposed on the outermost surface. This is because the shape-retaining film layer not only has high shape-retaining properties, but also exhibits heat-sealability and printability (due to the surface uneven structure). For example, if the shape-retaining film layer is disposed on the inner surface of the packaging material, the packaging material can be heat-sealed or printed on the inner surface of the packaging material. If the shape retaining film layer is disposed on the outer surface of the packaging material, printing can be easily performed on the outer surface of the packaging material.
- the shape-retaining film of the present invention has a high tensile elastic modulus in the X direction (stretching direction), it has a high thermal conductivity in the X direction. For this reason, the shape retention film of this invention can be used as an anisotropic heat conductive film. Since the heat conductivity in the X direction (stretching direction) of the anisotropic heat conductive film usually exceeds 3.0 W / mK, high heat conductivity can be achieved without adding a heat conductive filler or the like. For this reason, the anisotropic heat conductive film using the shape retention film of the present invention is more flexible than a conventional heat conductive film to which a heat conductive filler or the like is added, and has sufficient heat conductivity even if it is thin. .
- the anisotropically conductive film has a property of anisotropically conducting heat, the ratio derived from the thermal conductivity in the X direction and the thermal conductivity in the Y direction (thermal conductivity in the X direction / thermal conductivity in the Y direction). ). For this reason, it is preferable that the thermal conductivity in the X direction / the thermal conductivity in the Y direction of the anisotropic thermal conductive film is more than 1 and 60 or less.
- the thermal conductivity in the X direction of the anisotropic thermal conductive film is measured as follows. (1) The anisotropic heat conductive film is cut to prepare a strip-shaped sample having a length (stretching direction: X direction) of 30 mm and a width (vertical direction and vertical direction: Y direction) of 3 mm. (2) A light receiving film (Bi thin film, thickness: about 1000 mm) is vapor-deposited on one side of the strip-shaped sample to obtain a test sample. (3) Thermal diffusivity ⁇ (m 2 / m) in the length direction (X direction) of the test sample at a temperature of 25 ° C.
- thermal diffusivity measuring device Laser PIT, manufactured by ULVAC-RIKO based on the optical AC method. s) is measured.
- specific heat Cp J / (kg ⁇ K)
- density ⁇ kg / m 3
- DSC differential scanning calorimetry
- the thermal conductivity in the Y direction of the anisotropic heat conductive film is 30 mm in length (perpendicular to the stretching direction: Y direction) 30 mm and width (in addition to the strip-shaped sample of the anisotropic heat conductive film in (1)). Measurement may be performed in the same manner as described above except that a 3 mm strip sample is prepared; and the thermal diffusivity in the length direction (Y direction) of the test sample using the sample is measured.
- the thickness of the anisotropic heat conductive film is preferably 20 to 100 ⁇ m, and more preferably 30 to 40 ⁇ m.
- the thickness of the anisotropic heat conductive film is less than 20 ⁇ m, the film is easily damaged when the anisotropic heat conductive film is bent or folded and stored.
- the thickness of the anisotropic heat conductive film is larger than 100 ⁇ m, the film becomes rigid and difficult to be stored in a state where it is bent in a narrow space such as an electronic device.
- the shape of the anisotropic thermal conductive film can theoretically be determined based on the ratio of thermal conductivity in the X direction / thermal conductivity in the Y direction.
- the ratio L1 / W1 between the length L1 in the X direction (high tensile modulus direction) and the length W1 in the Y direction (low tensile modulus direction) of the anisotropic heat conductive film is preferably 60 or less.
- L1 / W1 exceeds 60, the heat generated from the heat source is not transmitted to the end of the anisotropic heat conductive film in the X direction, and cannot be radiated.
- fever of the Y direction of an anisotropic heat conductive film cannot be suppressed when W1 is too small.
- the shape of the anisotropic heat conductive film actually varies depending on the heat source temperature and the environmental temperature; the arrangement of the heat source and the radiator as described later.
- a heat source of 100 ° C. is arranged at the center of the anisotropic heat conductive film; heat is dissipated from both ends of the anisotropic heat conductive film in the X direction at room temperature (about 23 ° C.).
- the ratio L1 / W1 between the length L1 in the X direction (high tensile modulus direction) and the length W1 in the Y direction (low tensile modulus direction) of the anisotropic heat conductive film is 2. If it is 0 or less, preferably 1.9 or less, heat can be selectively dissipated in the X direction of the anisotropic heat conductive film, and heat can be hardly dissipated in the Y direction.
- the anisotropic thermal conductive film has different thermal conductivities in the X direction and the Y direction, it is preferable to cut the anisotropic thermal conductive film into a shape such that L1 / W1 is in the above range.
- the anisotropic heat conductive film cut into such a shape can suppress heat conduction in the Y direction (low tensile elastic modulus direction) while conducting heat in the X direction (high tensile elastic modulus direction). .
- the ratio L1 / W1 between the length L1 in the X direction (high tensile elastic modulus direction) and the length W1 in the Y direction (low tensile elastic modulus direction) of the anisotropic heat conductive film is expressed as follows.
- the ratio of thermal conductivity in the Y direction is preferably more than 1.0, and preferably 1.6 or more.
- the shape of the anisotropic heat conductive film may be a rectangular shape or a shape other than a rectangular shape.
- the length L1 in the X direction of the anisotropic heat conductive film indicates the maximum length in the X direction; the length W1 in the Y direction indicates the maximum length in the Y direction.
- the length in the X direction and the length in the Y direction of the anisotropic heat conductive film can be appropriately changed depending on the temperature of the heat source. If the temperature of the heat source is high, the conduction region of the heat generated from the heat source becomes large, so the length in the X direction and the length in the Y direction of the anisotropic heat conductive film are large (while maintaining the ratio of L1 / W1). Become. If the temperature of the heat source is low, the conduction region of the heat generated from the heat source becomes small. Therefore, the length in the X direction and the length in the Y direction of the anisotropic heat conduction film are small (while maintaining the ratio of L1 / W1). Become. In any case, the length of the anisotropic heat conductive film in the X direction may be a length that can conduct heat to at least the heat radiating body.
- the anisotropic heat conductive film using the shape-retaining film of the present invention has high shape-retaining properties and heat conductivity, and also has excellent storage properties because of its flexibility.
- the anisotropic heat conductive film of this invention can be preferably used for the heat dissipation apparatus in various electronic devices; especially the electronic device which does not have sufficient space around a heat source. In such a heat dissipation device, heat can be efficiently transmitted to the heat dissipating body while preventing heat from the heat source from being transmitted to a circuit that is vulnerable to heat.
- Examples of electronic devices in which the anisotropic heat conductive film is used include various home appliances, lighting, PCs, mobile phones, smartphones, digital cameras, game machines, electronic paper, electric cars, hybrid cars, and the like.
- the heat source in an electronic device is not specifically limited, For example, a transistor, CPU, IC, LED, a power device, etc. are mentioned.
- the anisotropic heat conductive film not only has good shape retention and high thermal conductivity, but also has excellent cooling and tactile sensations because it is substantially made of a resin.
- the anisotropic heat conductive film of this invention can be used not only for the said electronic device but for daily goods, such as clothing (suit, work clothes), a mask, a hat, and bedding.
- the anisotropic heat conductive film of the present invention can also be used for cryogenic applications. Specifically, connecting materials such as valves and gloves used for transport, storage, and handling of liquid natural gas and liquid hydrogen; constituent materials for low-temperature parts of linear motor cars; blood components, bone marrow fluid, sperm Cryopreservation containers for storing body fluids and cells; Constituent materials for superconducting magnetic resonance devices, etc .; Constituent materials for use in rockets and space transportation systems; Can be mentioned.
- connecting materials such as valves and gloves used for transport, storage, and handling of liquid natural gas and liquid hydrogen; constituent materials for low-temperature parts of linear motor cars; blood components, bone marrow fluid, sperm Cryopreservation containers for storing body fluids and cells; Constituent materials for superconducting magnetic resonance devices, etc .; Constituent materials for use in rockets and space transportation systems; Can be mentioned.
- the anisotropic heat conductive film of this invention is preferably used as a heat radiating device in the electronic device which has heat sources, such as a heat generating element. That is, the heat radiating device includes an anisotropic heat conductive film that conducts heat generated by a heat source, and a heat radiating body that removes heat conducted through the anisotropic heat conductive film.
- a heat radiator is arrange
- a plurality of radiators may be arranged in the X direction in the plane of the anisotropic heat conductive film as well as in the X direction (high tensile modulus direction) end of the anisotropic heat conductive film.
- a heat radiator is not specifically limited, A well-known heat radiator can be used.
- the heat radiating body include a cooling device such as a heat radiating fan, a cooling pipe, a large-area member (for example, a heat radiating plate, a heat sink, etc.) made of a material having high thermal conductivity such as metal.
- the heat radiator in the electronic device may be, for example, the casing of the electronic device.
- Such a heat dissipation device can be manufactured by an arbitrary method. Specifically, it can be produced by connecting an anisotropic heat conductive film and a heat radiator by a known method.
- the method of connecting the anisotropic heat conductive film and the heat radiating body include a method of heat-sealing the anisotropic heat conductive film to the heat radiating body; a method of fixing using a known adhesive; an anisotropic heat conductive film And the like, and the like is included and fixed by fixing means provided on the radiator.
- a heat radiator and an anisotropic heat conductive film are connected so that the base material layer of an anisotropic heat conductive film (shape retention film) may contact
- the heat source and the anisotropic heat conductive film are not necessarily in contact with each other, but it is preferable that the heat source and the anisotropic heat conductive film are in contact with each other in order to increase the heat radiation efficiency from the heat source.
- the preferable positional relationship among the anisotropic heat conductive film, the heat source, and the heat radiating body can be theoretically determined based on the ratio of the thermal conductivity in the X direction / the thermal conductivity in the Y direction. For this reason, in the X direction of the anisotropic heat conductive film, the distance from the center of the projected portion of the heat source to the anisotropic heat conductive film or the center of the contact portion of the anisotropic heat conductive film with the heat source to the radiator
- the ratio L2 / W2 between L2 and the distance W2 from one end of the anisotropic heat conductive film to the other end passing through the center of the projection part or the center of the contact part is 30 or less. It is preferable.
- L2 / W2 is greater than 30, L2 is too large, making it difficult to conduct heat to the heat dissipating member disposed at the end of the anisotropic heat conducting film in the X direction; This is because the heat conduction in the Y direction of the isotropic heat conductive film cannot be suppressed.
- the actual positional relationship between the anisotropic heat conductive film, the heat source, and the heat radiating body also varies depending on the heat source temperature and the environmental temperature.
- anisotropic heat conduction of the heat source in the X direction of the anisotropic heat conductive film A distance L2 from the center of the projected part to the film or the heat source of the anisotropic heat conductive film to the heat dissipating body; and an anisotropic heat conductive film passing through the center of the projected part or the center of the contact part
- the ratio L2 / W2 to the distance W2 from one end to the other end in the Y direction is 1.0 or less, preferably 0.95 or less
- the X of the anisotropic heat conductive film is selectively used. Heat can be dissipated in the direction, and heat can be made difficult to dissipate in
- the anisotropic thermal conductive film of the present invention has different thermal conductivity in the X direction (high tensile elastic modulus direction) and in the Y direction (low tensile elastic modulus direction). For this reason, the heat generated from the heat source is adjusted by adjusting the shape of the anisotropic heat conductive film and the positional relationship of the heat source, the anisotropic heat conductive film, and the radiator so that L2 / W2 is in the above range. Can be easily transmitted efficiently to the heat dissipating body in the X direction of the anisotropic heat conductive film, and difficult to be transmitted in the Y direction.
- FIG. 3 is a schematic diagram showing an example of the positional relationship between the heat source, the anisotropic heat conductive film, and the heat radiator.
- 3A is a side view and FIG. 3B is a top view.
- a heat dissipating device 20 having an anisotropic heat conductive film 24 and a heat dissipating body 26 is disposed near a heat source 22 such as a heat generating element.
- the distance from the center 22A of the projected portion of the heat source 22 to the anisotropic heat conductive film 24 in the X direction of the anisotropic heat conductive film 24 to the radiator 26 is indicated by L2;
- a distance from one end of the anisotropic heat conductive film 24 in the Y direction to the other end passing through the center 22A of the projected portion on the film 24 is indicated by W2.
- the heat generated in the heat source 22 is in the X direction of the anisotropic heat conductive film 24. It is transmitted well (in the direction of high tensile modulus) and is removed by the radiator 26. On the other hand, since heat is hardly transmitted in the Y direction (low tensile modulus direction) of the anisotropic heat conductive film 24, other electrical circuits (not shown) near the anisotropic heat conductive film 24 are damaged by the heat. Hateful.
- the length in the X direction and the length in the Y direction of the anisotropic heat conductive film can be appropriately changed depending on the temperature of the heat source. If the temperature of the heat source is high, the heat conduction region generated from the heat source becomes large, so the length in the X direction and the length in the Y direction of the anisotropic heat conductive film become large while maintaining the above ratio. If the temperature of the heat source is low, the conduction region of the heat generated from the heat source becomes small, so the length in the X direction and the length in the Y direction of the anisotropic heat conduction film become small.
- the L2 / W2 is preferably more than 0.5, more preferably 0.8 or more, based on the ratio of thermal conductivity in the X direction / thermal conductivity in the Y direction.
- the length W2 in the Y direction of the anisotropic heat conductive film may be different depending on the position in the X direction. For example, the length in the Y direction of the anisotropic heat conductive film near the heat-sensitive device may be increased, and the length in the Y direction of the anisotropic heat conductive film at other locations may be decreased.
- FIG. 4 is a schematic view showing an example of an electronic apparatus incorporating the anisotropic heat conductive sheet of the present invention.
- the heat dissipation structure 30 is disposed in contact with a heat source 32 such as a heating element disposed on the printed circuit board 31 and is disposed in parallel with the surface of the printed circuit board 31.
- 34 and a heat radiating body 36 disposed so as to be in contact with the surface of the anisotropic heat conductive film 34 opposite to the surface in contact with the heat source 32.
- the anisotropic heat conductive film 34 can be used as the anisotropic heat conductive film of the present invention.
- the longitudinal direction of the anisotropic heat conductive film 34 in FIG. 4 is the X direction (high tensile modulus direction).
- FIG. 5 is a schematic view showing an example of an electronic apparatus incorporating the anisotropic heat conductive sheet of the present invention.
- the heat radiating structure 30 ′ is separated from the heat sources 32A to 32D arranged on both surfaces of the printed circuit board 31 and is disposed so as to intersect the printed circuit board 31, and the heat source 32A.
- Anisotropy heat conduction film 34A which is bent and arranged so as to connect 32B and radiator 36;
- Anisotropy which is bent and arranged so as to connect heat sources 32C and 32D and radiator 36
- a heat conductive film 34B is the longitudinal direction of the anisotropic heat conductive film 34A and the anisotropic heat conductive film 34B.
- the longitudinal direction of the anisotropic heat conductive film 34A and the anisotropic heat conductive film 34B is the X direction (high tensile modulus direction).
- the heat generated by the plurality of heat sources 32A and 32B arranged on one surface of the printed circuit board 31 smoothly passes through the anisotropic heat conductive film 34A in the X direction (arrow direction). It is transmitted and removed by the radiator 36.
- heat generated by the plurality of heat sources 32C and 32D arranged on one surface of the printed circuit board 31 is transmitted through the anisotropic heat conductive film 34B in the X direction (arrow direction) and removed by the heat radiating body 36.
- the anisotropic heat conductive films 34A and 34B have high flexibility and high shape retention, and thus can hold the bent shape as shown in FIG.
- Shape-retaining fiber The shape-retaining fiber of the present invention comprises at least one base layer containing an ethylene polymer and at least one soft layer containing a polymer material.
- This “ethylene polymer” is the same as the ethylene polymer constituting the base layer of the shape-retaining film.
- the “polymer material” is the same as the polymer material constituting the soft layer of the above-described shape maintaining film.
- the thickness of the shape-retaining fiber of the present invention is 200 denier or less, preferably 100 denier or less, and may be further reduced. When the micro multifilament is used, it is preferably several deniers. Denier is the mass of a 9000 meter fiber expressed in grams. The thickness of the shape-retaining fiber strongly affects the texture (for example, softness) of the fabric when the fiber is used as the fabric. Moreover, what is necessary is just to adjust the length of a shape retention fiber suitably according to the use.
- the shape retention fiber of the present invention has excellent shape retention.
- Shape retention is indicated by the return angle from a 90 ° bend test.
- the return angle by the 90 ° bending test with respect to the fiber direction of the shape-retaining fiber of the present invention is 35 ° or less.
- the return angle by the 90 ° bending test with respect to the fiber direction of the shape-retaining fiber is considered to be the return angle by the 90 ° bending test of the film (shape holding film) before being cut into fibers.
- times bending test of a shape maintenance film can be measured as follows.
- the shape-retaining film is cut to prepare a sample piece 60 having a width (direction perpendicular to the extending direction of the molecular chain of polyethylene) 10 mm and a length (extending direction of the molecular chain of polyethylene) 50 mm.
- the angle ⁇ formed with the sample piece 60 may be measured (see FIG. 6B).
- the 90 ° return angle can be measured under conditions of a temperature of 23 ° C. and a humidity of 55% RH.
- the tensile elastic modulus of the shape-retaining fiber of the present invention is 10 to 50 GPa, preferably 13 to 50 GPa.
- the tensile modulus of the shape-retaining fiber is regarded as the tensile modulus of the film (shape-retaining film) before being cut into fibers.
- the shape-retaining fiber of the present invention can be obtained by cutting the shape-retaining film described above. By adjusting the draw ratio of uniaxial stretching of the shape-retaining film, the tensile elastic modulus of the obtained shape-retaining fiber can be adjusted. The higher the stretching ratio of uniaxial stretching, the higher the tensile elastic modulus of the stretched polyethylene film by stretching the molecular chain of polyethylene.
- the shape-retaining fiber of the present invention has high thermal conductivity in the fiber length direction.
- the thermal conductivity in the longitudinal direction of the fiber can be set to 3 to 30 W / mK, and further can be set to 10 to 30 W / mK.
- the heat conductivity of a shape retention fiber is regarded as the heat conductivity of the film (shape retention film) before being cut into fibers.
- the thermal conductivity in the fiber length direction of the shape-retaining fiber can be adjusted by the stretching ratio of uniaxial stretching in the fiber manufacturing process (described later).
- uniaxially stretching the polyethylene contained in the shape-retaining fiber exhibits anisotropy in the stretching direction and the direction perpendicular thereto.
- the higher the uniaxial stretching ratio the higher the anisotropy.
- the thermal conductivity in the stretching direction of an anisotropic polymer is improved as compared to the thermal conductivity of an isotropic polymer.
- the shape-retaining fiber of the present invention can be used for various applications. It may be used as a stopper like a wire; if it is used as a fiber constituting the woven fabric, shape retention can be imparted to the woven fabric.
- shape-retaining fibers of the present invention include various clothing (shirts, suits, blazers, blouses, coats, jackets, blousons, jumpers, vests, dresses, trousers, skirts, work clothes, various types Uniform, pants, underwear (slip, petticoat, camisole, brassiere), socks, tabi, kimono, obi, gold collar), cool clothing, tie, handkerchief, tablecloth, gloves, supporter, corset, footwear (sneakers, boots, sandals , Sandals, pumps, mules, slippers, ballet shoes, kung fu shoes), scarves, scarves, stalls, eye masks, towels, bags, bags (tote bags, shoulder bags, handbags, pochettes, shopping bags, eco bags, rucksacks , Daypack, sports bag, Boston bag, waist bag, waist pouch, second bag, clutch bag, vanity, accessory pouch, mother bag, party bag, kimono bag), pouch case (make
- the whole of the above specific example may be composed of the shape-retaining fiber of the present invention, or only a portion requiring shape retaining property may be composed of the shape-retaining fiber of the present invention. Further, they may be combined with other materials or may be combined together. For example, it can be used in combination with cloth, non-woven fabric and the like.
- the shape-retaining fiber of the present invention has properties such as light weight, toughness, and easy deformation. Therefore, the shape-retaining fiber and the woven fabric of the present invention can be applied to various uses as reinforcing materials in which, for example, glass fiber, carbon fiber, aramid fiber or the like is employed. Specifically, it can be used for reinforcement of aircraft, automobiles, trains, etc., and equipment for these. In particular, the shape-retaining fiber and the woven fabric of the present invention can be used for automobile bodies, airbags, seat belts, doors, bumpers, cockpit modules, console boxes, glove boxes, and the like.
- the shape-retaining fiber of the present invention comprises: (1) an original film provided with at least one base layer containing an ethylene polymer and at least one soft layer containing a polymer material. And (2) a second step of stretching (preferably uniaxially stretching) the raw film at a temperature higher than the melting point Tm2 of the polymer material so that the stretching ratio is 10 to 30 times. And (3) a third step of cutting the shape-retaining film obtained by stretching by a technique called a microslit method. Since high-density polyethylene may be difficult to melt-spin, it is preferable to fiberize the film by defibrating. In addition, said 1st process and 2nd process are the same as the 1st process and 2nd process in the manufacturing method of the above-mentioned shape retention film.
- the shape-retaining film cut in the third step is preferably a laminate having a three-layer structure in which two base layers are provided and a soft layer is sandwiched between the two base layers. .
- a laminate having such a three-layer structure is easier to cut than a laminate composed of two layers of a base material layer and a soft layer.
- the shape-retaining fibers obtained by cutting a laminate having such a three-layer structure can be easily processed into a woven fabric or the like.
- the shape maintaining film cut in the third step may be a laminated film in which another layer is laminated on the surface.
- the other layer can be a layer for imparting design properties to the shape-retaining fiber to be produced.
- the layer for imparting designability is, for example, a layer having metallic luster or hue.
- a metal layer may be laminated on the shape maintaining film.
- the metal layer is formed using a conventional method, and can be formed using a vacuum deposition method, a sputtering method, or the like.
- a shape-retaining fiber can be obtained by cutting a shape-retaining film or a film having an arbitrary layer laminated thereon by a micro slit method.
- the micro slit method is a method of cutting a film to be cut by feeding it to a micro slitter having a slit blade such as a laser blade or a rotary shear (rotating blade).
- the cutting direction when cutting the shape-retaining film into fibers is preferably parallel to the direction in which the molecular chain of the shape-retaining film is extended (main stretching direction). Thereby, the shape retention fiber excellent in shape retainability and heat conductivity is obtained.
- the slit width of the slit blade is preferably 100 to 500 ⁇ m.
- the slit width corresponds to the long side of the cross section of the obtained shape-retaining fiber.
- the shape-retaining fibers of the present invention can be made into a woven fabric by crossing them according to a certain rule and finishing them into a film.
- all the fibers which comprise a textile fabric are the shape retention fibers of this invention, only a part may be the shape retention fibers of this invention.
- shape retaining property can be imparted to the woven fabric.
- the fabric structure There is no particular restriction on the fabric structure.
- a basic organization structure such as plain weave, twill weave, satin weave, or a three-dimensional structure such as weft knitting, warp knitting, circular knitting, or cross knitting may be used.
- the woven fabric may be a woven fabric having a three-dimensional structure.
- a fabric having a three-dimensional structure is a fabric that is three-dimensionally finished by weaving fibers in the thickness direction in addition to a two-dimensional structure.
- the shape-retaining fiber of the present invention has high thermal conductivity in the fiber length direction. Therefore, if the shape-retaining fiber of the present invention is oriented in the thickness direction of the fabric, the thermal conductivity in the thickness direction of the fabric is increased.
- JP-T-2001-513855 describes a three-dimensional woven fabric having two sets of right-angle wefts constituting a planar structure and warp threads in the thickness direction. If the warp in the thickness direction is used as the shape-retaining fiber of the present invention, the thermal conductivity in the thickness direction is increased.
- the shape-retaining fiber of the present invention may be a twisted yarn.
- the means for twisted yarn There is no particular limitation on the means for twisted yarn. Specific examples of means for obtaining a twisted yarn include (1) twisting one shape-retaining fiber of the present invention alone, (2) twisting a plurality of shape-retaining fibers of the present invention together, (3) Twist the shape-retaining fiber of the present invention and other single or plural kinds of fibers. (4) After twisting one shape-retaining fiber of the present invention alone, wrap it around a core yarn.
- a plurality of the shape-retaining fibers of the invention are collectively wound around a core yarn, (6) the shape-retaining fibers of the present invention and other fibers are collectively wound around the core yarn, and (7) the other fibers are twisted After that, it can be wound around the shape-retaining fiber (core yarn) of the present invention.
- the obtained twisted yarn can also be made into a woven fabric.
- the length direction of the fiber is randomized. For this reason, if the shape retention fiber of this invention made into twisted yarn is made into a woven fabric, the thermal conductivity to the film thickness direction of a woven fabric will increase.
- the process to a textile becomes easy by making the shape retention fiber of this invention into a twisted yarn.
- the fibers to be micromultifilaments are refined to a few deniers.
- the density of the fabric of the present invention is not particularly limited, but if the density of the shape-retaining fibers of the present invention is increased, the thermal conductivity can be increased.
- the woven fabric of the present invention can be used for various applications. For example, by using it for clothes, clothes with high heat dissipation can be obtained.
- HDPE high density polyethylene (trade name “NOBATTEC HD HB530”, manufactured by Nippon Polyethylene Co., Ltd.), density: 965 kg / m 3 , Mw / Mn: 15.8, MFR (190 ° C.): 0.36 g / 10 min
- Thermoplastic elastomer ⁇ -olefin copolymer (trade name “Tuffmer A4090”, manufactured by Mitsui Chemicals), melting point Tm2: 77 ° C.
- HDPE was used as a raw material for the base material layers (A) and (B), and a thermoplastic elastomer was used as a raw material for the soft layer.
- a three-type three-layer extruder equipped with a full flight type screw the raw materials of each layer were melted.
- Three types of molten resins were coextruded at 260 ° C. in a multilayer die so as to be in the order of lamination of the base layer (A) / soft layer / base layer (B) to obtain a raw film.
- the obtained raw film was uniaxially stretched at 120 ° C. using a roll uniaxial stretching machine to obtain a uniaxially stretched film having a stretch ratio of 15 times and a total thickness of 40 ⁇ m.
- FIG. 7 shows an optical micrograph showing a cross section of the uniaxially stretched film obtained in Example 1.
- stretching direction of a uniaxially stretched film is shown.
- the base material layer (B) 42, the soft layer 45, and the base material layer (A) 40 are laminated
- reference numerals 50 and 52 indicate the film surface
- reference numerals 54 and 56 indicate jigs for fixing the film.
- Example 2 A uniaxially stretched film was obtained in the same manner as in Example 1 except that the raw film was stretched at a stretch ratio of 20 times.
- the thermal conductivity in the stretching direction (X direction) of the obtained uniaxially stretched film is 7.86 W / mK
- the thermal conductivity in the direction substantially perpendicular to the X direction (Y direction) is 0.289 w / mK. there were.
- HDPE was used as a raw material and melt kneaded at 260 ° C. using an extruder.
- the melt-kneaded raw material was discharged from a T die to obtain an original sheet having a thickness of 600 ⁇ m.
- the obtained raw film was uniaxially stretched at 120 ° C. using a heating roll to obtain a uniaxially stretched film having a stretch ratio of 15 times and a total thickness of 40 ⁇ m.
- Comparative Example 2 Except that the mixture obtained by adding 3 parts by weight of LLDPE (1) to 100 parts by weight of HDPE was used as a raw material, and obtained by extruding a single-layer raw film, the same as in Example 1 above. A uniaxially stretched film was obtained.
- Comparative Example 3 A uniaxially stretched film was obtained in the same manner as in Comparative Example 2 except that a mixture in which 10 parts by weight of LLDPE (1) was added to 100 parts by weight of HDPE was used as a raw material.
- Comparative Example 4 A uniaxially stretched film was obtained in the same manner as in Comparative Example 2 except that a mixture obtained by adding 3 parts by weight of LLDPE (2) to 100 parts by weight of HDPE was used as a raw material.
- Comparative Example 5 A uniaxially stretched film was obtained in the same manner as in Comparative Example 2 except that a mixture in which 10 parts by weight of LLDPE (2) was added to 100 parts by weight of HDPE was used as a raw material.
- the shape-holding film was cut to obtain a strip-shaped sample piece having a width (direction orthogonal to the stretching direction of the uniaxially stretched film) of 10 mm and a length (stretching direction of the uniaxially stretched film) of 120 mm.
- the tensile modulus in the stretching direction of the obtained specimen was measured using a tensile tester at a distance between chucks of 100 mm and a tensile speed of 100 mm / min.
- Ten sample elastic modulus was measured about five sample pieces, and the average value was computed. The measurement was performed under conditions of a temperature of 23 ° C. and a humidity of 55% RH.
- Example 1 The shape retention films of Example 1 and Comparative Examples 1 to 5 were measured for tensile modulus, return angle, and tear strength. The results are shown in Table 1. Moreover, the graph which plotted tearing strength (mN) with respect to the ratio (weight%) of the low melting-point material in a film is shown in FIG. Furthermore, the graph which plotted the return angle (degree) with respect to the ratio (weight%) of the low melting-point material in a film is shown in FIG.
- the uniaxially stretched film (shape retaining film) obtained in Example 1 has a tear strength as compared with the uniaxially stretched film (shape retained film) obtained in Comparative Examples 1 to 5. It is clear that it is significantly higher. Further, as shown in FIGS. 8 and 9, when the ratio of the low melting point material (LLDPE) in the film is increased, the tear strength is improved while the return angle tends to increase (Comparative Examples 1 to 5). On the other hand, as is clear from the results of Examples 1 and 2, the soft layer and the base containing the low melting point material (thermoplastic elastomer) without substantially mixing the low melting point material into the constituent material of the base material layer.
- LLDPE low melting point material
- the tear strength was remarkably improved, the return angle was hardly increased, and the shape retention was maintained at a high level.
- the thickness of the uniaxially stretched film obtained in Example 2 is thicker than that of the uniaxially stretched film obtained in Example 1, the tear strength is high even when the draw ratio is high.
- the shape-retaining film of the present invention has excellent shape-retaining properties, high tensile elastic modulus, and good longitudinal tear resistance. Therefore, anisotropic heat conduction for heat dissipation devices incorporated in various electronic devices. It is suitable as a material for a film or shape retaining fiber.
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Abstract
Description
本発明の形状保持フィルムは、特定のエチレン系重合体を含む少なくとも一層の基材層と、その融点が、前記エチレン系重合体の融点に比して低い高分子材料(低融点材料)を含む少なくとも一層の軟質層とを備える。以下、それぞれの構成要件ごとに説明する。
基材層には特定のエチレン系重合体が含まれる。なお、基材層はエチレン系重合体からなる層であることが好ましい。このエチレン系重合体は、エチレン単独重合体、又はエチレン-α-オレフィン共重合体である。エチレンに少量のα-オレフィンを共重合させることで、成形加工性を高めることができる。エチレンに共重合させるα-オレフィンは、炭素数3~6のα-オレフィンである。炭素数3~6のα-オレフィンの例には、プロピレン、1-ブテン、及び1-ヘキセン等が含まれ、好ましくはプロピレンである。エチレン-α-オレフィン共重合体に含まれるα-オレフィン単位の割合は2重量%未満であり、好ましくは0.05~1.5重量%である。
軟質層には高分子材料が含まれる。なお、軟質層は高分子材料からなる層であることが好ましい。
本発明の形状保持フィルムは、前述の基材層と軟質層とを有する。基材層と軟質層は、接着層を介して積層されていてもよく、接着層等の中間層を介在させずに直接積層されていてもよい。なお、接着層等の形状保持性に寄与しない層を介在させることなく、基材層の一方の面上に軟質層が直接積層されていることが、形状保持性が高まるために好ましい。
本発明の形状保持フィルムは、(1)エチレン系重合体を含む少なくとも一層の基材層と、高分子材料を含む少なくとも一層の軟質層と、を備えた原反フィルムを得る第一の工程と、(2)この原反フィルムを延伸倍率が10~30倍となるように延伸(好ましくは一軸延伸)する第二の工程と、を有する製造方法により製造することができる。
本発明の形状保持フィルムは、前述のように、優れた形状保持性を有する。このため、本発明の形状保持フィルムは、各種包装材、特に食品用の包装材として好ましく用いられる。食品用の包装材は、カップラーメンやプリン等の容器を密閉する蓋材であってもよいし、スナック菓子やレトルト食品等を包装する袋材であってもよい。
また、形状保持フィルムの少なくとも一方の面の一部又は全部に粘着層、接着層、ヒートシール層、断熱層、耐熱層、耐候(耐光)層、耐薬品層、ガスバリア層、クッション層、印刷層、導電層、剥離(離型)層、光反射層、光触媒層、発泡体、紙、木材、不織布、金属、セラミック等、様々な機能を付与した層を配置した積層フィルム・テープとすることも好ましい。
更に、積層フィルム・テープの中でも、特に、粘着層を配置した粘着フィルム・テープは、本発明の形状保持フィルムの優れた形状保持性及び耐縦裂き性を生かし、例えば、シュリンクテープ、梱包用テープ、結束用テープ(ワイヤーハーネス結束用等)、包装用テープ、事務用テープ、生活用品用テープ(紙おむつ用、スポーツ用等)、マスキングテープ(塗装用、養生用等)、表面保護用テープ(光学用、FPC用プロテクトフィルム等)、防食用テープ、電気絶縁用テープ、両面テープ、医療用テープ(絆創膏等)、電気・電子機器用テープ、識別用テープ、装飾用テープ(メディア用、グラフィックディスプレイ用、マーキング用等)、建築・建材用テープ(熱線遮へい用、防音用、ガラス飛散防止用)、自動車用テープ、熱伝導テープ(放熱テープ等)、ラベル、シール等に用いることができる。
本発明の形状保持フィルムは優れた形状保持性及び耐縦裂き性を有するため、例えば食品類や洗剤類等の包装材、各種詰め替え用の包装材として好適である。更に、アルミニウム箔等の金属箔を含まない包装材とすれば、電子レンジでの加熱調理用の包装材としても好適である。
更に、本発明の形状保持フィルムは、X方向(延伸方向)に高い引張弾性率を有することから、X方向に高い熱伝導率を有する。このため、本発明の形状保持フィルムは、異方性熱伝導フィルムとして用いることができる。異方性熱伝導フィルムのX方向(延伸方向)の熱伝導率は、通常、3.0W/mKを超えるので、熱伝導性のフィラー等を添加しなくても高い熱伝導率を達成できる。このため、本発明の形状保持フィルムを用いた異方性熱伝導フィルムは、熱伝導性フィラー等を添加した従来の熱伝導フィルムに比べて柔軟であり、薄くても十分な熱伝導性を有する。
熱伝導率λ=α×ρ×Cp
本発明の形状保持繊維は、エチレン系重合体を含む少なくとも一層の基材層と、高分子材料を含む少なくとも一層の軟質層とを備える。この「エチレン系重合体」は、前述の形状保持フィルムの基材層を構成するエチレン系重合体と同一である。また、「高分子材料」は、前述の形状保持フィルムの軟質層を構成する高分子材料と同一である。
本発明の形状保持繊維の用途の具体例としては、各種衣料(シャツ、スーツ、ブレザー、ブラウス、コート、ジャケット、ブルゾン、ジャンパー、ベスト、ワンピース、ズボン、スカート、作業服、各種ユニフォーム、パンツ、下着(スリップ、ペチコート、キャミソール、ブラジャー)、靴下、足袋、和服、帯地、金襴)、冷感衣料、ネクタイ、ハンカチーフ、テーブルクロス、手袋、サポーター、コルセット、履物(スニーカー、ブーツ、サンダル、草履、パンプス、ミュール、スリッパ、バレエシューズ、カンフーシューズ)、マフラー、スカーフ、ストール、アイマスク、タオル、袋物、バッグ(トートバッグ、ショルダーバッグ、ハンドバッグ、ポシェット、ショッピングバッグ、エコバック、リュックサック、デイパック、スポーツバッグ、ボストンバッグ、ウエストバッグ、ウエストポーチ、セカンドバック、クラッチバッグ、バニティ、アクセサリーポーチ、マザーバッグ、パーティバッグ、和装バッグ)、ポーチ・ケース(化粧ポーチ、ティッシュケース、めがねケース、ペンケース、ブックカバー、ゲームポーチ、キーケース、パスケース、たばこケース、ライターケース)、財布、帽子(ハット、キャップ、キャスケット、ハンチング帽、テンガロンハット、チューリップハット、サンバイザー、ベレー帽)、ヘルメット、頭巾、ベルト、エプロン、テーブルクロス、コースター、リボン、コサージュ、ブローチ、カーテン、壁布、シートカバー、シーツ、布団、布団カバー、毛布、枕、枕カバー、ソファー、ベッド、かご、各種ラッピング材料、室内装飾品、自動車用品、自転車用品、ベビーカー、チャイルドシート、玩具、手芸用品、造花、マスク、ガーゼ、包帯、おむつ、ロープ、傘、レインコート、スポーツ用品、介護用品、乳幼児用品、医療用品、生理用品、各種ネット、魚網、セメント補強材、スクリーン印刷用メッシュ、各種フィルター(自動車用、家電用)、各種メッシュ、敷布(農業用、レジャーシート)、土木工事用織物、建築工事用織物、ろ過布等を挙げることができる。なお、上記具体例の全体を本発明の形状保持繊維で構成してもよいし、形状保持性が要求される部位のみ本発明の形状保持繊維で構成してもよい。また、他素材と貼り合わせたり、縫い合わせたりして、組み合わせて構成してもよい。例えば、布、不織布等と組み合わせて用いることができる。
本発明の形状保持繊維は、(1)エチレン系重合体を含む少なくとも一層の基材層と、高分子材料を含む少なくとも一層の軟質層と、を備えた原反フィルムを得る第一の工程と、(2)この原反フィルムを延伸倍率が10~30倍となるように、高分子材料の融点Tm2よりも高い温度で延伸(好ましくは一軸延伸)する第二の工程と、(3)延伸して得られた形状保持フィルムをマイクロスリット法と称される手法で裁断する第三の工程と、を有する製造方法により製造することができる。高密度のポリエチレンは溶融紡糸が困難な場合があるため、フィルムを解繊することで繊維化することが好ましい。なお、上記の第一の工程及び第二の工程は、前述の形状保持フィルムの製造方法における第一の工程及び第二の工程と同様である。
本発明の形状保持繊維を一定の規則によって交錯させ、フィルム状に仕上げることによって織物とすることができる。なお、織物を構成する繊維の全部が本発明の形状保持繊維であっても、一部のみが本発明の形状保持繊維であってもよい。織物を構成する繊維の一部又は全部を本発明の形状保持繊維とすることで、織物に形状保持性を付与することができる。
HDPE:高密度ポリエチレン(商品名「ノバッテックHD HB530」、日本ポリエチレン社製)、密度:965kg/m3、Mw/Mn:15.8、MFR(190℃):0.36g/10min
LLDPE(1):直鎖状低密度ポリエチレン(商品名「エボリューH SP4505」、プライムポリマー社製)、
LLDPE(2):直鎖状低密度ポリエチレン(商品名「モアテック 0278G」、プライムポリマー社製)
熱可塑性エラストマー:α-オレフィン共重合体(商品名「タフマーA4090」、三井化学社製)、融点Tm2:77℃
HDPEを基材層(A)及び(B)の原料として用いるとともに、熱可塑性エラストマーを軟質層の原料として用いた。フルフライト型のスクリューを備えた三種三層押出機を使用して、それぞれの層の原料を溶融した。三種類の溶融樹脂を多層ダイ内で、基材層(A)/軟質層/基材層(B)の積層順となるように260℃で共押し出しして積層し、原反フィルムを得た。得られた原反フィルムを、ロール一軸延伸機を使用して120℃で一軸延伸し、延伸倍率15倍、総厚40μmの一軸延伸フィルムを得た。
延伸倍率20倍に原反フィルムを延伸したこと以外は、前述の実施例1と同様にして一軸延伸フィルムを得た。なお、得られた一軸延伸フィルムの延伸方向(X方向)の熱伝導率は7.86W/mKであり、X方向と略直交する方向(Y方向)の熱伝導率は0.289w/mKであった。
HDPEを原料とし、押出機を使用して260℃で溶融混錬した。溶融混練した原料をTダイから吐出させ、厚さ600μmの原反シートを得た。得られた原反フィルムを、加熱ロールを使用して120℃で一軸延伸し、延伸倍率15倍、総厚40μmの一軸延伸フィルムを得た。
100重量部のHDPEに対して3重量部のLLDPE(1)を添加した混合物を原料として用いるとともに、単層の原反フィルムを押し出して得たこと以外は、前述の実施例1と同様にして一軸延伸フィルムを得た。
100重量部のHDPEに対して10重量部のLLDPE(1)を添加した混合物を原料として用いたこと以外は、前述の比較例2と同様にして一軸延伸フィルムを得た。
100重量部のHDPEに対して3重量部のLLDPE(2)を添加した混合物を原料として用いたこと以外は、前述の比較例2と同様にして一軸延伸フィルムを得た。
100重量部のHDPEに対して10重量部のLLDPE(2)を添加した混合物を原料として用いたこと以外は、前述の比較例2と同様にして一軸延伸フィルムを得た。
(1)密度
JIS K7112 D法に準拠し、浸漬液としてエタノール/水を使用して基材層の密度を測定した。
形状保持フィルムをカットして、幅(一軸延伸フィルムの延伸方向と直交する方向)10mm、長さ(一軸延伸フィルムの延伸方向)120mmの短冊状の試料片を得た。JIS K7161に準拠し、引張試験機を用いてチャック間距離100mm、引張速度100mm/分で、得られた試料片の延伸方向の引張弾性率を測定した。5つの試料片について引張弾性率を測定し、平均値を算出した。なお、測定は温度23℃、湿度55%RHの条件下で実施した。
形状保持フィルムをカットして、幅(一軸延伸フィルムの延伸方向と直交する方向)10mm、長さ(一軸延伸フィルムの延伸方向)50mmの試料片を得た。図1(A)に示すように、試料片10を、厚みが1.2mmの板材12の下面、端部及び上面にわたって巻き付けた。このようにして、試料片10を180°に折り曲げて、(手で押さえて、または1kgの重りを載せて)折り曲げ状態を約30秒間保持した。その後、図1(B)に示すように、(手を離してまたは1kgの重りを外して)折り曲げ状態を解除した。折り曲げ状態を解除して30秒間後の、板材の上面12Aと試料片10のなす角θを「戻り角度」として測定した。なお、測定は温度23℃、湿度55%RHの条件下で実施した。
エルメンドルフ引裂き試験機(東洋精機製作所社製、F.S=1000mN)を使用し、寸法:63mm幅×75mm長のフィルム片に長さ20mmのスリットを入れたものを16枚重ねた試験片を、フィルムの延伸方向と平行に引き裂いたときに要する力を測定した。
実施例1及び比較例1~5の形状保持フィルムについて、引張弾性率、戻り角度、及び引裂強度を測定した。結果を表1に示す。また、フィルム中の低融点材料の割合(重量%)に対して引裂強度(mN)をプロットしたグラフを図8に示す。更に、フィルム中の低融点材料の割合(重量%)に対して戻り角度(°)をプロットしたグラフを図9に示す。
12 板材
12A 板材の上面
15 包装材
15A 開口部
20 放熱装置
22 熱源
24,34,34A,34B 異方性熱伝導フィルム
26,36 放熱体
31 プリント基板
32,32A,32B,32C,32D 熱源
30,30’ 放熱構造
40 基材層(A)
42 基材層(B)
45 軟質層
50,52 フィルム表面
54,56 治具
62 鋼材
12A,12B 面
Claims (14)
- 密度が900kg/m3以上であり、重量平均分子量(Mw)/数平均分子量(Mn)が5~20であるエチレン系重合体を含む少なくとも一層の基材層と、
高分子材料を含む少なくとも一層の軟質層と、を備え、
前記エチレン系重合体は、エチレン単独重合体又は炭素数3~6のα-オレフィン単位の含有量が2重量%未満であるエチレン-α-オレフィン共重合体であり、
前記高分子材料の融点Tm2は、前記エチレン系重合体の融点Tm1よりも低く、
引張弾性率が10~50GPaであり、180°曲げ試験による戻り角度が65°以下である、形状保持フィルム。 - 前記基材層の一方の面上に前記軟質層が直接積層された積層体である、請求項1に記載の形状保持フィルム。
- 前記基材層を二層有するとともに、二層の前記基材層の間に前記軟質層が挟持された積層体である、請求項1に記載の形状保持フィルム。
- 前記高分子材料の融点Tm2が、前記エチレン系重合体の融点Tm1よりも5℃以上低い、請求項1に記載の形状保持フィルム。
- 前記高分子材料の融点Tm2が125℃以下である、請求項1に記載の形状保持フィルム。
- 前記高分子材料が、炭化水素系プラスチック、ビニル系プラスチック、及び熱可塑性エラストマーからなる群より選択される少なくとも一種である、請求項1に記載の形状保持フィルム。
- 前記軟質層の厚さの総和が、前記基材層の厚さの総和の5~40%である、請求項1に記載の形状保持フィルム。
- 一軸延伸フィルムである、請求項1に記載の形状保持フィルム。
- 延伸方向における引張弾性率が10~50GPaであり、前記延伸方向と略直交する方向における引張弾性率が6GPa以下である、請求項8に記載の形状保持フィルム。
- 厚さが20~100μmである、請求項1に記載の形状保持フィルム。
- 請求項1に記載の形状保持フィルムの製造方法であって、
密度が900kg/m3以上であり、重量平均分子量(Mw)/数平均分子量(Mn)が5~20であるエチレン系重合体を含む少なくとも一層の基材層と、
高分子材料を含む少なくとも一層の軟質層と、を備え、
前記エチレン系重合体は、エチレン単独重合体又は炭素数3~6のα-オレフィン単位の含有量が2重量%未満であるエチレン-α-オレフィン共重合体であり、
前記高分子材料の融点Tm2は、前記エチレン系重合体の融点Tm1よりも低い原反フィルムを得る第一の工程と;
前記原反フィルムを延伸倍率が10~30倍となるように延伸する第二の工程と;を含む、形状保持フィルムの製造方法。 - 請求項1に記載の形状保持フィルムと、
前記形状保持フィルムの少なくとも一方の面の一部又は全部に配置された粘着層と、を備えた、積層テープ。 - 請求項1に記載の形状保持フィルムを含む、異方性熱伝導フィルム。
- 密度が900kg/m3以上であり、重量平均分子量(Mw)/数平均分子量(Mn)が5~20であるエチレン系重合体を含む少なくとも一層の基材層と、
高分子材料を含む少なくとも一層の軟質層と、を備え、
前記エチレン系重合体は、エチレン単独重合体又は炭素数3~6のα-オレフィン単位の含有量が2重量%未満であるエチレン-α-オレフィン共重合体であり、
前記高分子材料の融点Tm2は、前記エチレン系重合体の融点Tm1よりも低く、
繊維方向の引張弾性率が10~50GPaであり、繊維方向に対する90°曲げ試験による戻り角度が35°以下である、形状保持繊維。
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JP2012530536A JP5663582B2 (ja) | 2010-08-25 | 2011-08-24 | 形状保持フィルム及びその製造方法、積層フィルム・テープ、粘着フィルム・テープ、並びに異方性熱伝導フィルム |
CN201180039688.9A CN103068576B (zh) | 2010-08-25 | 2011-08-24 | 形状保持膜及其制造方法、叠层膜、叠层带、粘着膜、粘着带、各向异性导热膜以及形状保持纤维 |
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US9895255B2 (en) | 2013-01-23 | 2018-02-20 | Hollister Incorporated | Multilayer film including foam layer and gas barrier layer |
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KR102339856B1 (ko) | 2014-12-24 | 2021-12-16 | 삼성전자주식회사 | 전자장치 |
US20160220440A1 (en) * | 2015-02-03 | 2016-08-04 | Michael J. Longo | Therapeutic tape |
EP3091047A1 (en) * | 2015-05-07 | 2016-11-09 | Dupont Teijin Films U.S Limited Partnership | Polyester film with electrical insulation and heat conduction properties |
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