WO2020050037A1 - Film de libération et stratifié de feuille adhésive l'utilisant - Google Patents

Film de libération et stratifié de feuille adhésive l'utilisant Download PDF

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Publication number
WO2020050037A1
WO2020050037A1 PCT/JP2019/032749 JP2019032749W WO2020050037A1 WO 2020050037 A1 WO2020050037 A1 WO 2020050037A1 JP 2019032749 W JP2019032749 W JP 2019032749W WO 2020050037 A1 WO2020050037 A1 WO 2020050037A1
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WIPO (PCT)
Prior art keywords
layer
release
density
density polyethylene
release film
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PCT/JP2019/032749
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English (en)
Japanese (ja)
Inventor
大谷博志
田崎竜幸
谷尚樹
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東レフィルム加工株式会社
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Application filed by 東レフィルム加工株式会社 filed Critical 東レフィルム加工株式会社
Priority to JP2019546428A priority Critical patent/JP6655238B1/ja
Priority to KR1020217003657A priority patent/KR102627147B1/ko
Priority to CN201980057215.8A priority patent/CN112638647B/zh
Publication of WO2020050037A1 publication Critical patent/WO2020050037A1/fr

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/40—Adhesives in the form of films or foils characterised by release liners
    • C09J7/405—Adhesives in the form of films or foils characterised by release liners characterised by the substrate of the release liner
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/06—Interconnection of layers permitting easy separation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/22—Plastics; Metallised plastics
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/40—Adhesives in the form of films or foils characterised by release liners
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • 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
    • B32B2323/00—Polyalkenes
    • B32B2323/04—Polyethylene
    • 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
    • B32B2323/00—Polyalkenes
    • B32B2323/10—Polypropylene

Definitions

  • the present invention relates to a release film. Specifically, the present invention relates to a release film suitable for a pressure-sensitive adhesive sheet laminate.
  • the support layer comprises at least one selected from the group consisting of polypropylene (B) and high-density polyethylene (C) having a density of 0.941 g / cm 3 or more, and low-density polyethylene (D) having a density of 0.940 g / cm 3 or less. ).
  • B polypropylene
  • C high-density polyethylene
  • D low-density polyethylene
  • the support layer contains at least one selected from the group consisting of polypropylene (B) and high-density polyethylene (C) having a density of 0.941 g / cm 3 or more, the rigidity of the release film is increased ( The stiffness is increased), and the handleability and release workability of the release film are improved.
  • the release layer in the present invention contains a low-density polyethylene (A) having a density of 0.940 g / cm 3 or less.
  • the low-density polyethylene (A) from the viewpoint of improving the peeling property between the pressure-sensitive adhesive sheet preferably has a density 0.935 g / cm 3 or less, more preferably 0.930 g / cm 3 or less, 0.928 g / cm Particularly preferred is 3 or less.
  • the density is preferably from 0.850 g / cm 3 or more, more preferably 0.860 g / cm 3 or more, 0.870 g / cm 3 or more is particularly preferable.
  • low-density polyethylene (A) having a density of 0.940 g / cm 3 or less may be referred to as “low-density polyethylene (A)”.
  • the low-density polyethylene includes a branched low-density polyethylene and a linear low-density polyethylene.
  • low-density polyethylene means a branched low-density polyethylene other than linear low-density polyethylene.
  • Any of the release layers in the present invention can be used.
  • the low-density polyethylene (A) in the release layer preferably contains at least a linear low-density polyethylene, and has a density of at least 0.850 to 0.940 g /. More preferably, it contains cm 3 linear low density polyethylene.
  • Linear low-density polyethylene is a copolymer of an ethylene monomer as a main component and an ⁇ - olefin.
  • the main component means a component contained in 50% by mole or more of the entire monomer components constituting the linear low-density polyethylene.
  • the ⁇ -olefin is preferably an ⁇ -olefin having 3 to 12 carbon atoms, and more preferably an ⁇ -olefin having 4 to 10 carbon atoms.
  • Specific examples include 1-butene, 1-pentene, 4-methyl-1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene and the like.
  • These ⁇ -olefins can be used alone or in combination.
  • ⁇ -olefins ⁇ -olefins having 4 to 8 carbon atoms are more preferable, and 1-butene, 1-hexene and 1-octene are particularly preferably used from the viewpoint of polymerization productivity.
  • the content of the low-density polyethylene (A) in the release layer is preferably 50% by mass or more based on 100% by mass of the total solid content of the release layer, and is 60% by mass. % Or more, more preferably 70% by mass or more. The upper limit is 100% by mass.
  • the low-density polyethylene (A) a linear low-density polyethylene and a branched low-density polyethylene can be used in combination.
  • the content of the branched low-density polyethylene is preferably 1 to 50 parts by mass, more preferably 3 to 40 parts by mass, and more preferably 5 to 30 parts by mass with respect to 100 parts by mass of the linear low-density polyethylene. It is particularly preferred to do so.
  • the release layer as linear low density polyethylene having a density of 0.850 ⁇ 0.940g / cm 3, density of 0.900 g / cm 3 or more 0.940 g / cm 3 or less of a linear low-density It is preferable to contain polyethylene and a linear low-density polyethylene having a density of 0.850 g / cm 3 or more and less than 0.900 g / cm 3 . Thereby, the releasability from the adhesive sheet is further improved.
  • linear low-density polyethylene having a density of 0.850 g / cm 3 or more and less than 0.900 g / cm 3 may be referred to as “linear ultra-low-density polyethylene”.
  • density may say 0.900 g / cm 3 or more 0.940 g / cm 3 or less linear low density polyethylene as "LLDPE”, a density of 0.850 g / cm 3 or more 0.900 g / cm 3
  • VLDPE linear ultra-low-density polyethylene of less than
  • LLDPE and VLDPE are copolymers of ethylene and ⁇ -olefin, and the density tends to decrease as the content of ⁇ -olefin increases.
  • the content of ⁇ -olefin in LLDPE is preferably 0.5 to 15 mol%, more preferably 1 to 10 mol%, and particularly preferably 2 to 7 mol% of the whole monomer component.
  • the content of ⁇ -olefin in VLDPE is preferably 4 to 30 mol%, more preferably 7 to 25 mol%, and particularly preferably 10 to 20 mol% of the whole monomer component.
  • LLDPE is preferably a copolymer of ethylene and an ⁇ -olefin having 3 to 12 carbon atoms, more preferably a copolymer of ethylene and an ⁇ -olefin having 4 to 10 carbon atoms, Particularly preferred is a copolymer of ethylene and an ⁇ -olefin having 4 to 8 carbon atoms.
  • ⁇ -olefins having 4 to 8 carbon atoms 1-butene, 1-hexene and 1-octene are preferred.
  • the density of LLDPE is preferably from 0.910 g / cm 3 or more, more preferably 0.915 g / cm 3 or more, 0.917 g / cm 3 or more is particularly preferable. Further, the density is at 0.940 g / cm 3 or less, preferably 0.935 g / cm 3 or less, more preferably 0.930 g / cm 3 or less, 0.928 g / cm 3 or less is particularly preferred.
  • VLDPE is preferably a copolymer of ethylene and an ⁇ -olefin having 3 to 12 carbon atoms, more preferably a copolymer of ethylene and an ⁇ -olefin having 4 to 10 carbon atoms, Particularly preferred is a copolymer of ethylene and an ⁇ -olefin having 4 to 8 carbon atoms.
  • ⁇ -olefins having 4 to 8 carbon atoms 1-butene, 1-hexene and 1-octene are preferred.
  • Density of VLDPE is preferably less than 0.895 g / cm 3, more preferably less than 0.890 g / cm 3, less than 0.885 g / m 3 is especially preferred. Further, the density is preferably from 0.855 g / cm 3 or more, more preferably 0.860 g / cm 3 or more, 0.865 g / cm 3 or more is particularly preferable.
  • the release layer preferably contains 2 to 30 parts by mass of VLDPE with respect to 100 parts by mass of LLDPE from the viewpoint of further improving the releasability from the pressure-sensitive adhesive sheet. It is more preferably contained by mass part, particularly preferably from 6 to 15 parts by mass.
  • the other polyolefins described above can be used alone or in combination of two or more.
  • the maximum height roughness Rz is preferably 5.0 ⁇ m or more, more preferably 10.0 ⁇ m or more, and further preferably 15.0 ⁇ m or more. It is particularly preferable that the thickness be 21.0 ⁇ m or more. The upper limit of the maximum height roughness Rz is about 50 ⁇ m. When the maximum height roughness Rz of the release layer surface is 5.0 ⁇ m or more, preferably 10.0 ⁇ m or more, an increase in the peeling force from the pressure-sensitive adhesive sheet after heating is easily suppressed.
  • ⁇ ⁇ Embossing is preferred among the above-mentioned unevenness forming methods.
  • the embossing treatment for example, a method in which a heated embossing roll is pressed against the release layer of the release film is preferable, and the unevenness formed on the release layer is controlled by adjusting the heating temperature and the pressing pressure of the embossing roll. be able to.
  • the heating temperature of the embossing roll is preferably from 80 ° C to 160 ° C, more preferably from 100 ° C to 140 ° C.
  • the support layer in the present invention includes at least one selected from the group consisting of polypropylene (B) and high-density polyethylene (C) having a density of 0.941 g / cm 3 or more, and low density having a density of 0.940 g / cm 3 or less.
  • high-density polyethylene (C) having a density of 0.941 g / cm 3 or more may be referred to as “high-density polyethylene (C)”
  • low-density polyethylene having a density of 0.940 g / cm 3 or less Polyethylene (D) may be referred to as "low density polyethylene (D)".
  • polypropylene (B) examples include a propylene homopolymer, a copolymer of propylene and another ⁇ -olefin, or a mixture thereof.
  • the polypropylene (B) preferably has a higher degree of crystallinity from the viewpoint of increasing the rigidity (strengthening) of the release film.
  • the crystallinity of the polypropylene (B) contained in the support layer is preferably 40% or more, more preferably 50% or more, and particularly preferably 60% or more.
  • the upper limit of the crystallinity is 100%.
  • the crystallinity of the polypropylene can be adjusted by controlling the cooling temperature and the cooling rate after the melt extrusion in the film forming process by melt extrusion of the support layer. For example, by lowering the cooling rate, the crystallinity of polypropylene increases. Further, the crystallinity can be increased by using a crystal nucleating agent in combination.
  • the crystal nucleating agent is not particularly limited, and a known compound can be used. Examples include inorganic substances such as talc, metal carboxylate, metal phosphate, sorbitol derivatives, metal salts of rosin, and the like.
  • polypropylene (B) and high-density polyethylene (C) may be used alone or in combination.
  • the content ratio (B: C) is not particularly limited, but is preferably, for example, 98: 2 to 2:98 by mass, and 95: 5 to 5:95 is more preferred.
  • the low-density polyethylene (D) may be the same or different from the low-density polyethylene (A) used for the release layer, but is preferably the same from the viewpoint of adhesion and productivity.
  • the linear low-density polyethylene and the branched low-density polyethylene are different types, and when the difference in density is 0.005 g / cm 3 or more, they are different types, and when they do not fall within the above range, they are the same type.
  • the content of the low-density polyethylene (D) in the support layer is preferably 3% by mass or more based on 100% by mass of the total solid content of the support layer, from the viewpoint of improving the adhesion between the release layer and the support layer. 5 mass% or more is more preferable, and 7 mass% or more is particularly preferable. On the other hand, if the content of the low-density polyethylene (D) is too large, the rigidity of the release film may decrease. Therefore, the content is preferably 40% by mass or less, more preferably 30% by mass or less, and 25% by mass. % Is particularly preferred.
  • the content ratio (B + C) :( D) of the total (B + C) of the polypropylene (B) and the high-density polyethylene (C) and the low-density polyethylene (D) is 97: 3 to 60 by mass. : 40, more preferably 95: 5 to 70:30, and particularly preferably 93: 7 to 75:25.
  • the adhesiveness can be further improved while securing the rigidity of the release film.
  • the support layer can contain additives such as a coloring pigment and an antioxidant.
  • a back layer can be provided on the surface of the support layer opposite to the surface on which the release layer is provided.
  • a back layer can be composed of the same or different composition as the release layer. Details of the back layer will be described later.
  • the thickness of the support layer is preferably from 20 to 130 ⁇ m, more preferably from 30 to 120 ⁇ m, further preferably from 40 to 100 ⁇ m, and particularly preferably from 50 to 80 ⁇ m.
  • the thickness of the release layer is preferably 5 to 40 ⁇ m, more preferably 10 to 35 ⁇ m, and particularly preferably 15 to 30 ⁇ m.
  • the ratio (Rt / St) of the thickness (Rt) of the release layer to the thickness (St) of the support layer is 0.05 to 0.50. It is preferably 0.10 to 0.40, more preferably 0.15 to 0.40.
  • the release film of the present invention can be manufactured by a known method such as a melt extrusion method or a melt extrusion lamination method.
  • a melt extrusion method or a melt extrusion lamination method.
  • the support layer, the release layer, and the optional back layer are formed by a melt coextrusion method. This enhances the adhesion between the release layer and the support layer. Further, the melt coextrusion method is preferable from the viewpoint of productivity.
  • the release film of the present invention preferably has a three-layer structure of a release layer / a support layer / a back layer, and all of these layers preferably contain a polyolefin as a main component.
  • the film is preferably formed by an extrusion method. That is, the release film of the present invention is preferably composed of a polyolefin multilayer (three-layer) coextruded film.
  • the release film of the present invention can reduce the peeling force from the pressure-sensitive adhesive sheet by heating.
  • the heating temperature is preferably 70 ° C. or higher, more preferably 75 ° C. or higher, and particularly preferably 80 ° C. or higher.
  • the upper limit is about 130 ° C.
  • the heating time is appropriately set depending on the heating temperature and the form of the release film.
  • the release force (normal release force) of the release layer surface to the pressure-sensitive adhesive tape is preferably 7.0 N / 50 mm or less, more preferably 4.0 N / 50 mm or less, and further 2.0 N / 50 mm. Or less, and particularly preferably 1.0 N / 50 mm or less.
  • the lower limit of the peeling force is about 0.05 N / 50 mm.
  • the difference between the heat peeling force and the normal peeling force (the value obtained by subtracting the normal peeling force from the heat peeling force) is preferably 2.0 N / 50 mm or less, more preferably 1.0 N / 50 mm or less, and further more preferably 0.7 N / 50 mm. It is preferably at most 50 mm, particularly preferably at most 0.3 N / 50 mm.
  • the release film of the present invention preferably has a back layer on the surface of the support layer opposite to the surface having the release layer.
  • the back layer can be provided for protecting the support layer or improving the slipperiness of the release film.
  • the back layer preferably contains a polyolefin, and more preferably contains a polyolefin as a main component.
  • containing a polyolefin as a main component means that the polyolefin is contained in an amount of 50% by mass or more based on 100% by mass of the total solid content of the back layer, and that the polyolefin is contained in an amount of 60% by mass or more. More preferably, the content is more preferably 70% by mass or more, particularly preferably 80% by mass or more. The upper limit is 100% by mass.
  • Polyolefins include homopolymers of ethylene, propylene and ⁇ -olefins having 4 to 10 carbon atoms, and copolymers thereof.
  • Examples of the ⁇ -olefin having 4 to 10 carbon atoms include 1-butene, 1-pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, and 3-methyl-1-butene , 4-methyl-1-pentene and the like.
  • copolymer examples include a copolymer of ethylene and propylene, a copolymer of ethylene and an ⁇ -olefin having 4 to 10 carbon atoms, and a copolymer of propylene and an ⁇ -olefin having 4 to 10 carbon atoms.
  • Copolymers include copolymers of ethylene, propylene and an ⁇ -olefin having 4 to 10 carbon atoms.
  • the above polyolefins may be used alone or in combination of two or more.
  • the back layer preferably contains at least one selected from the group consisting of polyethylene and polypropylene.
  • polyethylene the aforementioned low-density polyethylene (A) is preferably used.
  • polypropylene a homopolymer of propylene is preferably used.
  • the back layer is preferably relatively rough from the viewpoint of ensuring the slipperiness of the release film.
  • the arithmetic average roughness Ra of the surface of the release layer is less than 0.5 ⁇ m
  • the back layer is preferably relatively rough.
  • the arithmetic average roughness Ra of the surface of the back layer is preferably 0.1 to 0.5 ⁇ m, more preferably 0.2 to 0.4 ⁇ m.
  • the maximum height roughness Rz of the surface of the back layer is preferably 1.0 to 7.0 ⁇ m, more preferably 1.5 to 6.0 ⁇ m, and more preferably 2.0 to 5.0 ⁇ m. It is particularly preferred that there is.
  • the back layer preferably contains a propylene homopolymer and a polyolefin other than the propylene homopolymer.
  • Polyolefins other than propylene homopolymer include polyethylene, homopolymers of ⁇ -olefins having 4 to 10 carbon atoms, copolymers of propylene and ethylene, and ⁇ -olefins having 4 to 10 carbon atoms of ethylene. It is preferable to use at least one member selected from the group consisting of Among these, a propylene-ethylene random copolymer is preferred.
  • the release film of the present invention is suitable as a release film for an adhesive sheet for a hard disk drive.
  • This pressure-sensitive adhesive sheet is preferably a non-silicone pressure-sensitive adhesive sheet containing no silicone compound.
  • the pressure-sensitive adhesive sheet to which the release film of the present invention is applied is not particularly limited, but the pressure-sensitive adhesive layer constituting the pressure-sensitive adhesive sheet includes an acrylic pressure-sensitive adhesive, a polyester-based pressure-sensitive adhesive, a urethane-based pressure-sensitive adhesive, a rubber-based pressure-sensitive adhesive, and the like. Non-silicone adhesives are preferably used. In particular, an acrylic pressure-sensitive adhesive is preferable.
  • ⁇ Measurement method> The temperature was raised from 0 ° C. to 250 ° C. at a rate of 10 ° C./min, and the heat of fusion was determined. From the obtained heat of fusion ⁇ H (J / g), the crystallinity was determined from the formula of ( ⁇ H / resin fraction / 209) ⁇ 100 (%).
  • the resin fraction indicates the polymer fraction in the material, and is 1.0 if the resin component is 100%.
  • 209 is the heat of fusion (J / g) at the time of 100% crystallization of polypropylene.
  • This adhesive sheet laminate was left at room temperature (23 ⁇ 2 ° C.) for 24 hours, and a sample heated at 40 ° C. for 10 days was prepared.
  • a tensile tester (“EZ-SX” manufactured by Shimadzu Corporation) was used.
  • EZ-SX tensile tester
  • Example 3 A release film having a three-layer laminated structure of a release layer / a support layer / a back layer was produced in the same manner as in Example 1 except that the support layer raw materials were changed as follows. The crystallinity of polypropylene in the support layer of this release film was 70%.
  • -Supporting layer raw material 93 parts by mass of polypropylene ("Novatech PP (registered trademark)" FL4, manufactured by Nippon Polypropylene Co., Ltd.) and linear low-density polyethylene ("Evolu (registered trademark)" SP0540, manufactured by Prime Polymer Co., Ltd.) 0.903 g / cm 3 ) a mixture with 7 parts by mass.
  • Example 5 A release film having a three-layer laminated structure of a release layer / a support layer / a back layer was produced in the same manner as in Example 1 except that the support layer raw materials were changed as follows. The crystallinity of polypropylene in the support layer of this release film was 70%.
  • -Supporting layer raw material 70 parts by mass of polypropylene ("Novatech PP (registered trademark) FL4" manufactured by Nippon Polypropylene Co., Ltd.) and linear low density polyethylene (“Evolu (registered trademark)" SP0540 manufactured by Prime Polymer Co., Ltd.) 0.903 g / cm 3 ) a mixture with 30 parts by mass.
  • Example 6 A release film was produced in the same manner as in Example 1, except that the raw materials of each layer were changed as follows. The crystallinity of polypropylene in the support layer of this release film was 70%.
  • Example 7 A release film was produced in the same manner as in Example 1, except that the raw materials of each layer were changed as follows. The crystallinity of polypropylene in the support layer of this release film was 70%.
  • Example 8 A release film was produced in the same manner as in Example 1, except that the raw materials of each layer were changed as follows. The crystallinity of polypropylene in the support layer of this release film was 70%.
  • Example 9 A release film was produced in the same manner as in Example 1, except that the raw materials of each layer were changed as follows. The crystallinity of polypropylene in the support layer of this release film was 70%.
  • the arithmetic average roughness Ra of the surface of the back layer was 0.3 ⁇ m, and the maximum height roughness Rz was 2.6 ⁇ m.
  • Example 21 to 31 Each of the release films produced in Example 1 and Examples 6 to 11 was subjected to an embossing treatment using the following embossing rolls to obtain a release film having fine irregularities formed on the surface of the release layer.
  • the embossing treatment was performed by pressing an embossing roll heated to 140 ° C. against a release layer of a release film.
  • Table 2 shows the relationship between the release film before embossing and the embossing roll.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Adhesive Tapes (AREA)

Abstract

L'objectif de la présente invention est de fournir un film de libération dans lequel l'étanchéité du contact entre un matériau de base (couche de support) et une couche de libération est excellente. Afin d'atteindre cet objectif, le film de libération selon la présente invention présente la constitution suivante. Plus précisément, le film de libération comprend au moins une couche de support et une couche de libération, la couche de libération contenant un polyéthylène basse densité (A) ayant une densité de 0,940 g/cm3 ou moins, la couche de support comprend un polyéthylène basse densité (D) ayant une densité de 0,940 g/cm3 ou moins et au moins un élément choisi dans le groupe constitué par le polypropylène (B) et un polyéthylène haute densité (C) ayant une densité de 0,941 g/cm3 ou plus.
PCT/JP2019/032749 2018-09-07 2019-08-22 Film de libération et stratifié de feuille adhésive l'utilisant WO2020050037A1 (fr)

Priority Applications (3)

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JP2019546428A JP6655238B1 (ja) 2018-09-07 2019-08-22 離型フィルム、およびそれを用いた粘着シート積層体
KR1020217003657A KR102627147B1 (ko) 2018-09-07 2019-08-22 이형 필름 및 그것을 사용한 점착 시트 적층체
CN201980057215.8A CN112638647B (zh) 2018-09-07 2019-08-22 脱模膜、及使用其的粘合片层叠体

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JP2018167531 2018-09-07
JP2018-167531 2018-09-07

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WO2020050037A1 true WO2020050037A1 (fr) 2020-03-12

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JP (1) JP2020075509A (fr)
KR (1) KR102627147B1 (fr)
CN (1) CN112638647B (fr)
TW (1) TWI816873B (fr)
WO (1) WO2020050037A1 (fr)

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JP2021088101A (ja) * 2019-12-04 2021-06-10 東レフィルム加工株式会社 離型フィルム
WO2024176592A1 (fr) * 2023-02-20 2024-08-29 東洋紡株式会社 Film stratifié, film stratifié pour démoulage, et film de démoulage

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JP7350642B2 (ja) 2019-12-04 2023-09-26 東レフィルム加工株式会社 離型フィルム
WO2024176592A1 (fr) * 2023-02-20 2024-08-29 東洋紡株式会社 Film stratifié, film stratifié pour démoulage, et film de démoulage

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TW202022074A (zh) 2020-06-16
TWI816873B (zh) 2023-10-01
KR20210057007A (ko) 2021-05-20
JP2020075509A (ja) 2020-05-21
CN112638647A (zh) 2021-04-09
KR102627147B1 (ko) 2024-01-19
CN112638647B (zh) 2022-12-06

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