WO2020203214A1 - Film stratifié - Google Patents

Film stratifié Download PDF

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Publication number
WO2020203214A1
WO2020203214A1 PCT/JP2020/011393 JP2020011393W WO2020203214A1 WO 2020203214 A1 WO2020203214 A1 WO 2020203214A1 JP 2020011393 W JP2020011393 W JP 2020011393W WO 2020203214 A1 WO2020203214 A1 WO 2020203214A1
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WO
WIPO (PCT)
Prior art keywords
resin layer
laminated film
resin
mass
less
Prior art date
Application number
PCT/JP2020/011393
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English (en)
Japanese (ja)
Inventor
馬場祐輔
町田哲也
井上則英
田邨奈穂子
大倉正寿
辰喜利海
Original Assignee
東レフィルム加工株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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 JP2020517393A priority Critical patent/JP7496309B2/ja
Priority to KR1020217027937A priority patent/KR20210148093A/ko
Priority to CN202080024223.5A priority patent/CN113613890B/zh
Publication of WO2020203214A1 publication Critical patent/WO2020203214A1/fr

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Classifications

    • 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
    • C09J7/29—Laminated material
    • 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
    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B32B25/14—Layered products comprising a layer of natural or synthetic rubber comprising synthetic rubber copolymers
    • 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
    • B32B7/022—Mechanical 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
    • C09J109/00—Adhesives based on homopolymers or copolymers of conjugated diene hydrocarbons
    • C09J109/06—Copolymers with styrene
    • 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
    • C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
    • 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]

Definitions

  • the present invention relates to a laminated film having excellent adherend dependence, which exhibits a constant adhesive force to various adherends having different surface shapes regardless of the shape of the adherend.
  • Products made of various materials such as synthetic resin, metal, and glass may be handled by attaching a protective sheet or film to the surface to prevent scratches and stains that occur during the processing / transportation process and storage. is there.
  • a surface protective film or the like in which an adhesive layer is formed on a supporting base material made of a thermoplastic resin or paper is used, and the adhesive layer surface is attached to an adherend and used.
  • liquid crystal displays and touch panel devices have become widespread, and these are composed of a large number of members such as optical sheets and optical films made of synthetic resin. Since it is necessary to reduce defects such as optical distortion as much as possible in such an optical member, a surface protective film is often used in order to prevent scratches and stains that may cause the defects.
  • Such a surface protective film has characteristics that it does not easily peel off from the adherend when it is subjected to environmental changes such as temperature and humidity or a small amount of stress, and when it is peeled off from the adherend, an adhesive is applied to the adherend. It is also required that no adhesive component remains and that it can be easily peeled off after processing or use.
  • adherends having an uneven shape on the surface such as a diffuser plate and a prism sheet have various surface shapes on the market, and the substrates having such different surface shapes are on the market.
  • a surface protective film that exhibits uniform adhesive strength to the adherend and can be used for general purposes that is, a surface protective film that is less dependent on the adherend.
  • Patent Documents 1 and 2 Regarding the surface protective film used for the adherend having an uneven shape on the surface, the techniques described in Patent Documents 1 and 2 can be mentioned.
  • Patent Documents 1 and 2 which are surface protective films used for an adherend having an uneven shape on the surface described above, all have a difference in adhesive strength due to a difference in the uneven shape of the adherend, so-called coating. It did not improve the body dependence.
  • the object of the present invention is to solve the above-mentioned problem. That is, it is an object of the present invention to provide a laminated film which exhibits uniform adhesive force to adherends having different surface shapes, can be used for general purposes, and has excellent adherend dependence.
  • a laminated film having a base material and a resin layer A on the side of at least one surface thereof, which satisfies the following (a), (b), and (c).
  • the maximum probe tack value F at 23 ° C. on the resin layer A side is 0.2 g / mm 2 or more and 2.5 g / mm 2 or less.
  • the resin layer A has a melting point Tm at 50 ° C. or higher.
  • the present invention is a laminated film having a base material and a resin layer A on at least one surface side thereof.
  • the resin layer A is a layer containing at least a resin, which is arranged on the side of at least one surface of the base material and satisfies the following (a), (b), and (c).
  • the type of the resin is not particularly limited as long as the resin layer A contains the resin, but the resin in the resin layer A is mixed so that the laminated film satisfies the following (a), (b), and (c). It is preferable to select.
  • a preferred embodiment of the resin contained in the resin layer A will be described later.
  • the maximum probe tack value F at 23 ° C. on the resin layer A side is 0.2 g / mm 2 or more and 2.5 g / mm 2 or less.
  • the resin layer A has a melting point Tm at 50 ° C. or higher.
  • the maximum probe tack value F at 23 ° C. on the resin layer A side is 0.2 g / mm 2 or more and 2.5 g / mm 2 or less.
  • Probe Tack maximum value F is, 0.3 g / mm 2 or more, more preferably, 0.4 g / mm 2 or more is more preferable.
  • the probe tack maximum value F is more preferably not more than 2.0g / mm 2, 1.5g / mm 2 or less still more preferred.
  • the maximum probe tack value F on the resin layer A side is less than 0.2 g / mm 2 , sufficient adhesive strength may not be obtained when the laminated film of the present invention is used as a surface protective film. Further, when the maximum probe tack value F on the resin layer A side is larger than 2.5 g / mm 2 , the adhesive force becomes too large, and particularly the adhesive force to the adherend having a small surface roughness roughness becomes large. In some cases, the dependency on the adherend becomes too large.
  • the maximum probe tack value F can be controlled by adjusting the material constituting the resin layer A described later, the flexibility, the thickness, the surface roughness, etc. of the resin layer A. For example, a method for hardening the resin layer A, a resin. method of reducing the thickness of the layer a, the method of increasing the surface roughness of the resin layer a, to be controlled by reducing the probe tack maximum value F below 0.2 g / mm 2 or more 2.5 g / mm 2 it can.
  • the laminated film of the present invention has a ratio of residual displacement hp (unit: ⁇ m) to maximum displacement hm (unit: ⁇ m) when a load unloading test by nanoindentation is performed at 26 ° C. on the resin layer A side and a maximum load of 1 mN.
  • hp / hm Hereinafter referred to as hp / hm
  • hp / hm is 0.50 or more and 0.90 or less.
  • the hp / hm is more preferably 0.60 or more, and further preferably 0.70 or more. Further, hp / hm is more preferably 0.80 or less.
  • hp / hm When hp / hm is less than 0.50, when the resin layer A side of the laminated film of the present invention is attached to the adherend, the resin layer A does not easily follow the uneven portion of the adherend, and the adhesive strength becomes high. It may be too small, or the adhesive force to an adherend having a particularly large surface roughness may be small, and the dependence on the adherend may be too large. If hp / hm exceeds 0.90, the adhesive strength may become too large.
  • the hp / hm can be controlled by a material or the like constituting the resin layer A described later.
  • the resin layer A in the laminated film of the present invention has a melting point Tm at 50 ° C. or higher, and more preferably 100 ° C. or higher.
  • Tm melting point
  • the upper limit of Tm is not particularly set, it is preferably 180 ° C. or lower.
  • the laminated film of the present invention is attached to the adherend and then stored at a high temperature, or as time passes, the resin layer A and the resin layer A The contact area of the adherend may increase and the adhesive strength may become too large. If the Tm exceeds 180 ° C., the viscosity may become too high and the productivity may deteriorate when the resin layer A is molded by melt extrusion.
  • Examples of the method for the resin layer A to have Tm at 50 ° C. or higher include a method of adding a crystalline resin having a melting point of 50 ° C. or higher to the material constituting the resin layer A. That is, a method in which the resin layer A contains a crystalline resin having a melting point of 50 ° C. or higher can be mentioned.
  • a crystalline resin suitable for being contained in such a resin layer A for example, a crystalline olefin resin is preferable from the viewpoint of compatibility with other components used in the resin layer A and productivity. Specific examples of the olefin resin will be described later.
  • the maximum probe tack value F, hp / hm obtained by nanoindentation measurement, and melting point Tm of the resin layer A can be measured by the methods described in Examples.
  • the resin layer A of the present invention has a storage elastic modulus G'(A) at 50 ° C. and 1 Hz preferably 1.5 MPa or more, more preferably 2.0 MPa or more, and even more preferably 2.5 MPa or more.
  • the upper limit of the storage elastic modulus G'(A) is not particularly set, 30 MPa is preferable from the viewpoint of adhesive properties such as stickiness.
  • the storage elastic modulus G'(A) of the resin layer A is set to 1.5 MPa or more when the laminated film of the present invention is attached to an adherend and then stored at a high temperature or after a lapse of time. It is preferable from the viewpoint of suppressing an increase in the contact area between the resin layer A and the adherend and suppressing an increase in the adhesive force.
  • the storage elastic modulus G'(A) of the resin layer A can be measured by the method described in Examples.
  • the storage elastic coefficient G'(A) of the resin layer A can be controlled by adjusting the material constituting the resin layer A.
  • the resin layer As an embodiment in which A contains a styrene-based elastomer, a method of further increasing the molecular weight of the styrene-based elastomer, a method of using a crystalline resin having a melting point of 50 ° C. or higher as the resin in the resin layer A, and a resin in the resin layer A. Examples thereof include a method of using an unhydrogenated or partially hydrogenated product of an aromatic copolymer, an aliphatic / aromatic copolymer, and the like.
  • the arithmetic average roughness Ra (A) on the resin layer A side of the present invention is preferably 0.20 ⁇ m or more, more preferably 0.30 ⁇ m or more, and particularly preferably 0.40 ⁇ m or more.
  • the arithmetic average roughness Ra (A) is preferably 0.80 ⁇ m or less, more preferably 0.70 ⁇ m or less, and particularly preferably 0.60 ⁇ m or less. Setting the arithmetic mean roughness Ra (A) to 0.20 ⁇ m or more reduces the dependence on the adherend, or after the laminated film of the present invention is attached to the adherend, it is stored at a high temperature for a long time.
  • the arithmetic mean roughness Ra (A) on the resin layer A side can be measured by the method described in the examples. Further, the arithmetic mean roughness Ra (A) on the resin layer A side can be controlled by, for example, the material constituting the resin layer A, the material constituting the base material, and the thickness of the resin layer A, which will be described later.
  • the laminated film of the present invention has a base material and a resin layer A on the side of at least one surface thereof.
  • the resin layer A refers to a layered layer having a finite thickness, and preferably has adhesiveness at room temperature.
  • the fact that the resin layer A has adhesiveness means that the resin layer A side of the laminated film is rolled on the resin layer A side of the laminated film with respect to the SUS304 plate having an arithmetic average roughness Ra of 0.2 ⁇ m and a ten-point average roughness Rz of 2.8 ⁇ m.
  • the adhesive strength between the resin layer A and the SUS304 plate was measured after bonding at a bonding pressure of 0.35 MPa using a special crimping roller manufactured by Yasuda Seiki Seisakusho Co., Ltd., the adhesive force was 1 g / 25 mm or more. Means to have.
  • the adhesiveness of the resin layer A is more preferably 2 g / 25 mm or more, and even more preferably 5 g / 25 mm or more.
  • the position of the resin layer A is not particularly limited as long as it is arranged on the side of at least one surface of the base material, but it is preferable that the resin layer A is arranged on at least one outermost layer of the laminated film of the present invention.
  • the adhesive resin layer A By arranging the adhesive resin layer A on the outermost layer of the laminated film, it is possible to bond the laminated film to the adherend via the resin layer A.
  • the resin layer A is not particularly limited as long as it is arranged on the side of at least one surface of the base material. Therefore, the base material and the resin layer A may be arranged so as to be in direct contact with each other, or the base material and the resin layer A may be arranged. Another layer, such as an easy-adhesion layer, may be provided between them.
  • the resin layer A is not particularly limited as long as the effects of the present invention are not impaired, and may contain elastomers such as acrylic, silicone, natural rubber, and synthetic rubber. Among these, it is preferable to use a thermoplastic synthetic rubber adhesive from the viewpoint of recyclability, and among them, a styrene elastomer is more preferable.
  • the styrene-based elastomer refers to a resin having a storage elastic modulus G'(25) at 25 ° C. and 1 Hz of 10 MPa or less and containing at least a styrene component as a monomer component.
  • the styrene-based elastomer suitable for being contained in such a resin layer A include a styrene / butadiene copolymer (SBR), a styrene / isoprene / styrene copolymer (SIS), and a styrene / butadiene / styrene copolymer.
  • Styrene-conjugated diene copolymers such as (SBS) and their hydrogenated products (for example, hydrogenated styrene-butadiene copolymer (HSBR), styrene-ethylenebutylene-styrene triblock copolymer (SEBS), styrene-. Ethylene butyrene block copolymer (SEB)), styrene / isobutylene copolymer (eg, styrene / isobutylene / styrene triblock copolymer (SIBS), styrene / isobutylene block copolymer (SIB), or A mixture of these) can be used.
  • SIBS styrene / isobutylene block copolymer
  • SIB styrene / isobutylene block copolymer
  • styrene-conjugated diene-based copolymers such as styrene-butadiene-styrene copolymer (SBS), their hydrogenated products, and styrene-isobutylene-based copolymers are preferably used. Further, only one type of styrene-based elastomer may be used, or two or more types may be used in combination.
  • the content of the styrene-based elastomer preferably contained in the resin layer A in the resin layer A is preferably 40% by mass or more, more preferably 50% by mass or more, when the entire resin layer A is 100% by mass.
  • the content of the styrene-based elastomer in the resin layer A is preferably 95% by mass or less, more preferably 90% by mass or less, and further preferably 75% by mass or less.
  • the melt flow rate (measured at MFR, 230 ° C., 2.16 kg) of the styrene-based elastomer preferably contained in the resin layer A is preferably 3 g / 10 minutes or more, more preferably 7 g / min or more, and 10 g / min. 10 minutes or more is more preferable.
  • the MFR of the styrene-based elastomer is preferably 50 g / 10 minutes or less, more preferably 30 g / 10 minutes or less, and even more preferably 20 g / 10 minutes or less.
  • the content of the styrene component in the styrene-based elastomer suitable for the resin layer A is preferably 5% by mass or more, more preferably 8% by mass or more, assuming that the entire styrene-based elastomer is 100% by mass.
  • the content of the styrene component in the styrene-based elastomer is preferably 55% by mass or less, more preferably 40% by mass or less.
  • the resin layer A of the present invention may contain an olefin resin having a melt flow rate (measured at MFR, 230 ° C., 2.16 kg) of 0.01 g / 10 minutes or more and 1.5 g / 10 minutes or less. preferable.
  • the resin layer A contains an olefin resin having an MFR of 0.01 g / 10 minutes or more and 1.5 g / 10 minutes or less, the olefin resin is dispersed as a domain component with respect to the elastomer which is the matrix component of the resin layer A.
  • the resulting structure can be formed, and the arithmetic mean roughness Ra (A) on the resin layer A side can be preferably controlled, and the dependency on the adherend can be reduced when the laminated film of the present invention is used as the adhesive film.
  • the MFR of the olefin resin in the resin layer A is more preferably 0.1 g / 10 minutes or more, and further preferably 0.2 g / 10 minutes or more.
  • the MFR of the olefin resin is more preferably 1.3 g / 10 minutes or less, and further preferably 1.0 g / 10 minutes or less. If the MFR is less than 0.01 g / 10 minutes, the olefin resin may aggregate and become FE due to poor dispersion of the domain component.
  • the MFR exceeds 1.5 g / 10 minutes, it is difficult to adjust the arithmetic mean roughness Ra (A) of the resin layer A to the range specified in the present application due to the increased dispersibility of the domain component.
  • the olefin-based resin preferably contained in the resin layer A include low-density polypropylene, medium-density polyethylene, high-density polypropylene, linear low-density polyethylene, ultrahigh-molecular-weight polyethylene, and low-crystalline or amorphous ethylene.
  • - ⁇ -Olefin copolymer crystalline polypropylene, low crystalline polypropylene, amorphous polypropylene, propylene / ⁇ -olefin copolymer, propylene / ethylene / ⁇ -olefin copolymer, polybutene, 4-methyl-1- Penten / ⁇ -olefin copolymer, ethylene / ethyl (meth) acrylate copolymer, ethylene / methyl (meth) acrylate copolymer, ethylene / n-butyl (meth) acrylate copolymer, ethylene / vinyl acetate copolymer Coalescence is mentioned, and among the above, polypropylene-based resins such as crystalline polypropylene, low crystalline polypropylene, amorphous polypropylene, propylene / ⁇ -olefin copolymer, and propylene / ethylene / ⁇ -olefin copoly
  • olefin resins may be used alone or in combination.
  • the ⁇ -olefin is not particularly limited as long as it can be copolymerized with ethylene, propylene and 4-methyl-1-pentene, and for example, ethylene, propylene, 1-butene, 1-hexene and 4-methyl-. Examples thereof include 1-pentene, 1-octene, 1-pentene and 1-hexene.
  • crystalline polypropylene is particularly preferable as the olefin-based resin in the resin layer A.
  • the olefin-based resin referred to here may correspond to the olefin-based elastomer described later.
  • the olefin-based resin referred to here does not include the above-mentioned styrene-based elastomer.
  • the content of the olefin resin in the resin layer A is preferably 5% by mass or more, more preferably 7% by mass or more, still more preferably 10% by mass or more, when the entire resin layer A is 100% by mass.
  • the content of the olefin resin in the resin layer A is preferably 35% by mass or less, more preferably 30% by mass or less, and particularly preferably 25% by mass or less.
  • the resin layer A of the present invention preferably contains an olefin-based elastomer.
  • the olefin-based elastomer referred to in the present invention is an olefin-based resin having a storage elastic modulus G'(25) at 25 ° C. and 1 Hz of 10 MPa or less, and / or tan ⁇ (25) at 25 ° C. and 1 Hz is 0. .
  • G'(25) at 25 ° C. and 1 Hz of 10 MPa or less
  • / or tan ⁇ (25) at 25 ° C. and 1 Hz is 0.
  • the olefin-based elastomer is an olefin-based resin having a constant storage elastic modulus G'(25) and a constant tan ⁇ (25), what corresponds to the olefin-based elastomer also corresponds to the above-mentioned olefin-based resin. It will be. Further, as described above, since the olefin-based resin does not contain the styrene-based elastomer, the olefin-based elastomer which is a part of the olefin-based resin does not contain the above-mentioned styrene-based elastomer.
  • the resin layer A of the present invention preferably contains an olefin-based elastomer, and among the above-mentioned olefin-type elastomers, an olefin-based elastomer having a tan ⁇ (25) of 0.5 or more at 25 ° C. and 1 Hz is used. It is more preferable to include it.
  • the tan ⁇ (25) of the olefin elastomer is more preferably 1.0 or more, and particularly preferably 1.5 or more.
  • the above-mentioned maximum probe tack value F and hp / hm obtained by nanoindentation on the resin layer A side can be preferably controlled.
  • olefin-based elastomer suitable for such a resin layer A examples include amorphous polypropylene, low crystalline polypropylene, amorphous polybutene, 4-methyl-1-pentene / ⁇ -olefin copolymer and the like. However, amorphous polypropylene and 4-methyl-1-pentene / ⁇ -olefin copolymers are preferably used.
  • the content of the olefin elastomer in the resin layer A of the present invention is preferably 3% by mass or more, more preferably 5% by mass or more, when the resin layer A is 100% by mass.
  • the content of the olefin elastomer in the resin layer A is preferably 30% by mass or less, more preferably 20% by mass. When the content of the olefin elastomer in the resin layer A exceeds 30% by mass, the adhesive force to the adherend may become too low.
  • the resin layer A of the present invention preferably contains a tackifier from the viewpoint of enhancing the adhesiveness to the adherend.
  • a tackifier those known for this purpose can be used.
  • an aliphatic copolymer, an aromatic copolymer, an aliphatic / aromatic copolymer, or an alicyclic copolymer can be used.
  • Petroleum resins such as copolymers, terpene-based resins, terpene-phenol-based resins, rosin-based resins, alkylphenol-based resins, xylene-based resins, hydrogenated products thereof, and the like, which are generally used in this application, can be used.
  • the content of the tackifier is preferably 5% by mass or more, more preferably 10% by mass or more, when the entire resin layer A is 100% by mass. Further, the content of the tackifier is preferably 40% by mass or less, more preferably 30% by mass or less, when the entire resin layer A is 100% by mass.
  • the resin layer A of the present invention contains at least an aromatic copolymer or an aliphatic / aromatic copolymer among the above-mentioned tackifiers.
  • the aromatic copolymer or the aliphatic / aromatic copolymer is an unhydrogenated or partially hydrogenated aromatic copolymer or an unhydrogenated or partially hydrogenated aliphatic / aromatic type. It is preferably a copolymer.
  • partial hydrogenation as used herein means that the hydrogenation ratio is 1% by mass or more and less than 90% by mass, and the term “unhydrogenated” means that the hydrogenation ratio is 0% by mass or more and less than 1% by mass. ..
  • the hydrogenation ratio of the partially hydrogenated aromatic copolymer or the partially hydrogenated aliphatic / aromatic copolymer is more preferably less than 80% by mass, further preferably less than 70% by mass, and 50% by mass. Less than mass% is particularly preferred.
  • the above-mentioned probe tack maximum value F The value of is preferably controlled, and the dependence on the adherend can be reduced.
  • the unhydrogenated or partially hydrogenated aromatic copolymer and the unhydrogenated or partially hydrogenated aliphatic / aromatic copolymer those having a softening point of 80 ° C.
  • the resin layer A of the laminated film of the present invention is an unhydrogenated or partially hydrogenated aromatic copolymer having a softening point of 80 ° C. or higher, and / or an unhydrogenated or partially hydrogenated aliphatic / aromatic copolymer. It is particularly preferable to contain a copolymer.
  • the hydrogenation rate can be calculated by measuring the nuclear magnetic resonance spectrum ( 1 H-NMR spectrum).
  • the resin layer A of the present invention may be appropriately added with other components such as a lubricant and other additives as long as the object of the present invention is not impaired.
  • the lubricant used for the resin layer A of the present invention when a styrene-based elastomer is formed into chips, the chips are adhered to the chip surface or precipitated on the surface of the resin layer A in order to prevent the chips from adhering or blocking each other. This is added to adjust the adhesive strength or to obtain good extrudability when the resin layer A is melt-extruded.
  • fatty acid metal salts such as calcium stearate and magnesium behenate, ethylene bisstearic acid amide, and the like. Examples thereof include fatty acid amides such as hexamethylene bisstearic acid amide and waxes such as polyethylene wax, polypropylene wax and paraffin wax.
  • the content of the lubricant is preferably 10% by mass or less, more preferably 5% by mass or less, and particularly preferably 3% by mass or less, assuming that the entire resin layer A is 100% by mass.
  • examples of the above-mentioned other additives include crystal nucleating agents, antioxidants, heat-resistant agents, weather-resistant agents, antistatic agents, and the like. These additives may be used alone or in combination, but the total content is preferably 3% by mass or less, more preferably 2% by mass or less, when the entire resin layer A is 100% by mass. ..
  • the resin layer A of the present invention may contain particles for the purpose of controlling the arithmetic mean roughness Ra (A) of the resin layer A.
  • the particles in the resin layer A for example, inorganic particles or organic particles can be used, and it is preferable that the particles are organic particles that are less likely to damage the adherend when bonded to the adherend.
  • the organic particles include acrylic resin particles, styrene resin particles, polyolefin resin particles, polyester resin particles, polyurethane resin particles, polycarbonate resin particles, polyamide resin particles, silicone resin particles, and fluorine resin particles.
  • examples thereof include copolymer resin particles of two or more kinds of monomers used in the synthesis of the above resin, and these may be used alone or in combination.
  • the average particle size of the particles in the resin layer A is preferably 0.1 ⁇ m or more, more preferably 1.0 ⁇ m or more, and more preferably 1.0 ⁇ m or more, from the viewpoint of preferably controlling the arithmetic average roughness Ra (A) and the adhesive properties of the resin layer A. More preferably, it is 0.0 ⁇ m or more.
  • the average particle size of the particles in the resin layer A is preferably 20.0 ⁇ m or less, more preferably 15.0 ⁇ m or less, and particularly preferably 10.0 ⁇ m or less.
  • the thickness of the resin layer A of the present invention is preferably 1.0 ⁇ m or more, more preferably 2.0 ⁇ m or more, from the viewpoint of ensuring adhesion to the adherend.
  • the thickness of the resin layer A is preferably 6.0 ⁇ m or less, preferably 5.0 ⁇ m or less, from the viewpoint of reducing the dependence on the adherend and suppressing the adhesion over time after being attached to the adherend or due to heating. Is more preferable, and 3.0 ⁇ m or less is further preferable.
  • the laminated film of the present invention has a base material.
  • the base material refers to a layered material having a finite thickness.
  • the material of the base material is not particularly limited, but for example, an olefin resin or an ester resin can be used, and among them, it is preferable to use an olefin resin as a main component from the viewpoint of productivity and processability.
  • the main component described here means the one having the highest mass% (the one having a large content) among all the components constituting the base material.
  • Examples of the olefin-based resin contained in the base material as the main component include low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear low-density polyethylene, and low-crystalline or amorphous ethylene / ⁇ -olefin.
  • the ⁇ -olefin is not particularly limited as long as it can be copolymerized with propylene or ethylene, and for example, 1-butene, 1-hexene, 4-methyl-1-pentene, 1-octene, 1-pentene, etc. 1-Heptene can be mentioned.
  • the olefin-based resin referred to here may correspond to the above-mentioned olefin-based elastomer.
  • the olefin-based resin referred to here does not include the above-mentioned styrene-based elastomer.
  • the domain component of the base material is also dispersed with respect to the matrix resin which is the main component. It is preferable to have a structure.
  • the above structure can be formed, for example, by using polypropylene as the main component constituting the base material and adding an incompatible polyolefin to the polypropylene, or by using a commercially available block polypropylene, so-called block copolymer or impact copolymer. ..
  • the melt flow rate of the resin used for the base material of the present invention is 0.5 g / g / from the viewpoint of productivity and stability during lamination with adjacent layers. 10 minutes or more is preferable, 1 g / 10 minutes or more is more preferable, and 2 g / 10 minutes or more is further preferable. From the same viewpoint as above, the MFR of the resin used as the base material is preferably 30 g / 10 minutes or less, more preferably 25 g / 10 minutes or less, and even more preferably 20 g / 10 minutes or less.
  • the substrate of the present invention preferably contains a styrene-based elastomer. That is, it is particularly preferable that the base material of the laminated film of the present invention contains an olefin resin and a styrene elastomer.
  • the styrene-based elastomer in the base material, when the styrene-based elastomer is used in the resin layer A, the affinity between the base material and the resin layer A is improved, and the interfacial adhesive force between the base material and the resin layer A is enhanced. be able to.
  • the content of the styrene-based elastomer in the base material is preferably 1% by mass or more, more preferably 2% by mass or more.
  • the content of the styrene-based elastomer in the base material is preferably 20% by mass or less, more preferably 10% by mass or less.
  • the styrene-based elastomer used for the base material of the present invention known ones can be used, and for example, the same styrene-based elastomer suitable for the resin layer A described above can be used.
  • a method of incorporating the styrene-based elastomer in the base material of the present invention for example, a method of recovering the present laminated film containing the styrene-based elastomer in the resin layer A, adding a recycled raw material to be used as the base material, is used. It can be mentioned, and adopting this method is a preferable method from the viewpoint of resin recycling and reduction of production cost.
  • the base material of the present invention may further contain an easy-adhesion component for satisfactorily laminating with the resin layer A of the present invention.
  • the thickness of the base material constituting the laminated film of the present invention can be appropriately adjusted according to the required characteristics of the laminated film, but is preferably 5 ⁇ m or more from the viewpoint of transportability and productivity during manufacturing and use. 10 ⁇ m or more is more preferable, and 20 ⁇ m or more is further preferable. Further, the thickness of the base material constituting the laminated film is preferably 200 ⁇ m or less, more preferably 100 ⁇ m or less, still more preferably 80 ⁇ m or less from the same viewpoint as described above.
  • the laminated film of the present invention preferably has the resin layer B on the side opposite to the surface of the base material having the resin layer A.
  • the resin layer B is a layer arranged on the side opposite to the surface having the resin layer A of the base material, at least a layer containing resin, and is a layer different from the resin layer A. is there. That is, the resin layer B is a layer that does not satisfy at least one of the above-mentioned (a), (b), and (c).
  • the resin layer B preferably has releasability, and refers to a layered resin layer having a finite thickness.
  • the position of the resin layer B is not particularly limited as long as it is arranged on the side opposite to the surface of the base material having the resin layer A. Therefore, the base material and the resin layer B are arranged so as to be in direct contact with each other. Alternatively, another layer may be provided between the base material and the resin layer B.
  • Examples of the resin used for the resin layer B of the laminated film of the present invention include an olefin resin and an ester resin, and among them, it is preferable to use an olefin resin as a main component from the viewpoint of productivity and processability.
  • the main component described here refers to a component having the highest mass% (high content) among the components constituting the resin layer B of the laminated film.
  • olefin-based resin suitable for the resin layer B examples include low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear low-density polyethylene, low-crystalline or amorphous ethylene / ⁇ -olefin copolymer, and the like.
  • the ⁇ -olefin is not particularly limited as long as it can be copolymerized with propylene or ethylene, and for example, 1-butene, 1-hexene, 4-methyl-1-pentene, 1-octene, 1-pentene, etc. 1-Heptene can be mentioned.
  • polyolefin resins from the viewpoint of imparting releasability by controlling the roughness of the resin layer B, a method in which polypropylene is the main component constituting the resin layer B and a polyolefin incompatible with the polypropylene is added. It is preferable to use commercially available block polypropylene, so-called block copolymer or impact copolymer.
  • the olefin resin in the resin layer B only one type may be used, or two or more types may be used in combination.
  • the olefin-based resin referred to here may correspond to the above-mentioned olefin-based elastomer.
  • the olefin-based resin referred to here does not include the above-mentioned styrene-based elastomer.
  • the melt flow rate of the resin used for the resin layer B of the present invention is 0.5 g from the viewpoint of productivity and stability during lamination with an adjacent layer. / 10 minutes or more is preferable, 1 g / 10 minutes or more is more preferable, and 2 g / 10 minutes or more is further preferable. Further, the MFR of the resin used for the resin layer B is preferably 30 g / 10 minutes or less, more preferably 25 g / 10 minutes or less, and further preferably 20 g / 10 minutes or less from the same viewpoint as described above.
  • a lubricant such as a fluorine-based resin, a silicone-based resin, a fatty acid metal salt, a fatty acid amide, inorganic particles, or organic particles may be further added as a mold release agent.
  • the laminated film of the present invention can be wound in a good winding shape when the laminated film is wound into a roll in a manufacturing process or a slit process, or can be wound from a roll at the time of slitting or use.
  • the force at which the film is unwound does not become too large, and the film can be unwound satisfactorily.
  • As another method for imparting releasability to the surface of the laminated film of the present invention opposite to the resin layer A there is also a method of adding the above-mentioned lubricant or the like to the base material without providing the resin layer B.
  • the method of providing the resin layer B is more preferable from the viewpoint of productivity, cost, and mold release effect.
  • the arithmetic average roughness Ra (B) of the resin layer B of the laminated film of the present invention is preferably 0.1 ⁇ m or more, more preferably 0.2 ⁇ m or more.
  • the upper limit of the arithmetic mean roughness Ra (B) of the resin layer B is not particularly set, but if it is 2 ⁇ m or more, deterioration of thickness accuracy and strength may become a problem.
  • the laminated film of the present invention has a resin layer A on the side of the base material and at least one surface thereof, but as described above, the laminated film has a resin layer B on the side opposite to the side having the resin layer A. Is preferable. Further, the laminated film of the present invention may be provided with a layer other than the base material, the resin layer A and the resin layer B as long as the effects of the present invention are not impaired, but the resin layer A and the resin layer B may be provided. It is preferable that each is located on the outermost surface of the laminated film.
  • the thickness of the laminated film of the present invention is preferably 10 ⁇ m or more, more preferably 25 ⁇ m or more, from the viewpoint of transportability and productivity during production and use. Further, the thickness of the laminated film is preferably 250 ⁇ m or less, more preferably 100 ⁇ m or less, from the same viewpoint as described above.
  • the method for producing the laminated film of the present invention is not particularly limited.
  • the resin compositions constituting each are individually extruderd.
  • the so-called coextrusion method in which the resin layer A, the base material, and the resin layer B are individually melt-extruded and then laminated by the laminating method can be mentioned. From the viewpoint of properties, it is preferably produced by a coextrusion method.
  • the material constituting each layer a material mixed with Henschel mixer or the like may be used, or a material obtained by kneading all or a part of the materials of each layer in advance may be used.
  • the coextrusion method known methods such as an inflation method and a T-die method are used, but the heat-melt coextrusion method by the T-die method is particularly preferable from the viewpoint of excellent thickness accuracy and surface shape control.
  • the constituent components of the resin layer A, the base material, and the resin layer B are each extruded from a melt extruder.
  • the extrusion temperature of the resin layer A is preferably 250 ° C. or lower, more preferably 230 ° C. or lower, and further preferably 220 ° C. or lower.
  • the extrusion temperature of the resin layer A exceeds 250 ° C., the arithmetic mean roughness Ra (A) on the resin layer A side may not be controlled within a desired range.
  • the lower limit is not particularly set, if the resin temperature is less than 180 ° C., the melt viscosity is too high, so that the productivity may decrease.
  • the resin layer A, the base material, and the resin layer B are laminated and integrated inside the T die, and coextruded. Then, the laminated film can be obtained by cooling and solidifying with a metal cooling roll, forming the film into a film, and winding the film into a roll.
  • the laminated film of the present invention can be used as a surface protective film for manufacturing, processing, transporting, scratch prevention, and dirt adhesion prevention of synthetic resin plates, metal plates, glass plates, etc., for example, a diffuser plate or a prism. It is preferably used as an optical surface protective film having irregularities on the surface of a sheet or the like. Further, it can be preferably used as a surface protective film for being used by being bonded to an adherend having a surface having an arithmetic average roughness Ra of 0.1 ⁇ m or more and 2 ⁇ m or less on the surface in contact with the resin layer A.
  • the scanning direction is set to the width direction in the range of 2 mm in the width direction and 0.2 mm in the longitudinal direction of the laminated film and the adherend in accordance with JIS B0601-1994. Twenty-one measurements were carried out at intervals of 10 ⁇ m in the longitudinal direction, and three-dimensional analysis was performed for evaluation. A diamond needle with a stylus tip radius of 2.0 ⁇ m was used, and the measurement was performed with a measuring force of 100 ⁇ N and a cutoff of 0.8 mm.
  • pellets of an olefin resin and a styrene elastomer are melt-molded to a thickness of 1 mm, and the storage elastic modulus G'at 25 ° C. obtained by measuring in the same manner as above is G'(25). ).
  • Thickness Using the microtome method, an ultrathin section having a cross section in the width direction-thickness direction of the laminated film and having a width of 5 mm was prepared, and the cross section was coated with platinum to prepare an observation sample. Next, the cross section of the laminated film was observed at an acceleration voltage of 2.5 kV using a field emission differential electron microscope (S-4800) manufactured by Hitachi, Ltd., and the base material, the resin layer A, and the resin layer were observed from any part of the observation image. The thickness of B and the total thickness of the laminated film were measured.
  • S-4800 field emission differential electron microscope
  • observation magnification it was set to 5,000 times when measuring the thicknesses of the resin layers A and B, and 1,000 times when measuring the thicknesses of the base material and the laminated film. Further, the same measurement was performed a total of 10 times, and the average value was used as the thickness of each of the base material, the resin layers A and B, and the total thickness of the laminated film.
  • the arithmetic average roughness Ra (X) of the adherend X is 0.2 ⁇ m
  • the ten-point average roughness Rz (X) is 2.2 ⁇ m
  • the arithmetic mean roughness Ra (Y) of the adherend Y is 0.
  • the 10-point average roughness Rz (Y) was 3.2 at 4 ⁇ m.
  • Adhesive strength Adhesive force with adherend X / Adhesive force with adherend Y ...
  • Equation (P1) The adhesive strength of the adherend X and the adherend Y was evaluated on the following three criteria. ⁇ : 5 g / 25 mm or more and less than 15 g / 25 mm ⁇ : 3 g / 25 mm or more and less than 5 g / 25 mm, or 15 g / 25 mm or more and less than 25 g / 25 mm ⁇ : 3 g / 25 mm or less, or 25 g / 25 mm or more Also, the formula (P1 ), The closer the adhesive strength ratio of the adherend X and the adherend Y was to 1, the better the adherend dependence was, and the film was evaluated in the following three stages. ⁇ : 0.5 or more and less than 2.0 ⁇ : 0.3 or more and less than 0.5, or 2.0 or more and less than 4.0 ⁇ : less than 0.3, or 4.0 or more.
  • Adhesive Magnification Adhesive strength after storage at 50 ° C / Adhesive strength after storage at 23 ° C ... Equation (P2)
  • the adhesive advancement ratio calculated based on the formula (P2) showed that the closer it was to 1, the better the stability during heat storage was, and the film was evaluated in the following three stages. ⁇ : 0.5 or more and less than 1.6 ⁇ : 0.3 or more and less than 0.5, or 1.6 or more and less than 2.5 ⁇ : less than 0.3 or 2.5 or more.
  • Example 1 The constituent resins of each layer were prepared as follows.
  • Base material 97% by mass of commercially available block polypropylene having an MFR of 8.5 g / 10 minutes, and 3% by mass of a styrene-based elastomer (Asahi Kasei SEBS, "Tough Tech” H1052, MFR 13 g / 10 minutes, G'(25) ⁇ 10 MPa) %Using.
  • Resin layer A Styrene-based elastomer (SEBS manufactured by Asahi Kasei, "Tough Tech” H1052, MFR 13 g / 10 minutes, G'(25) ⁇ 10 MPa) by 70% by mass, high melt tension polypropylene ("Waymax” MFX8 manufactured by Japan Polypropylene Corporation) , MFR 1g / 10 minutes, G'(25)> 10MPa, tan ⁇ (25) ⁇ 0.5) by 15% by mass, tackifier (manufactured by Arakawa Chemical Industries, Ltd., "Arcon” M115, aromatic copolymer, softening A point 115 ° C. and a watering ratio ⁇ 90%) were used in an amount of 15% by mass, and those previously kneaded and chipped with a twin-screw extruder were used.
  • SEBS Styrene-based elastomer
  • Resin layer B 95% by mass of the same as the commercially available block polypropylene used for the base material was used, and 5% by mass of a commercially available silicone-based surface modifier was used as the release agent.
  • each extruder of the T-die composite film forming machine having three extruders, and the resin layer A is 3.5 ⁇ m, the base material is 30 ⁇ m, and the resin layer B is 5 ⁇ m.
  • the discharge amount of each extruder is adjusted so as to be, laminated in this order, extruded from a composite T-die at an extrusion temperature of 200 ° C., cast on a roll whose surface temperature is controlled to 40 ° C., and molded into a film. Was wound to obtain a laminated film.
  • the thickness of the base material was 30 ⁇ m
  • the thickness of the resin layer B was 5 ⁇ m
  • the arithmetic mean roughness Ra (B) of the resin layer B was 0.20 ⁇ m.
  • the composition constituting the resin layer A contains 70% by mass of a styrene-based elastomer ("Tough Tech” H1052), 15% by mass of high melt tension polypropylene (“Waymax” MFX8), and 5% by mass of a tackifier "Arcon” M115. %, Adhesive-imparting agent "FTR” 8100 (manufactured by Mitsui Chemicals, aromatic copolymer, softening point 100 ° C., watering ratio ⁇ 90%) was set to 10% by mass in the same manner as in Example 1. A laminated film was obtained.
  • the composition constituting the resin layer A contains 60% by mass of a styrene elastomer (“Tough Tech” H1052), 15% by mass of high melt tension polypropylene (“Waymax” MFX8), and 5% by mass of the tackifier “Arcon” M115. %, 10% by mass of tackifier "FTR” 8100, 10% of olefin elastomer (Mitsui Chemicals "Absorter" EP-1001, MFR 10g / 10 minutes, G'(25) 33MPa, tan ⁇ (25) 1.9)
  • a laminated film was obtained in the same manner as in Example 1 except that the mass was set to%.
  • the composition constituting the resin layer A contains 80% by mass of a styrene-based elastomer (“Tough Tech” H1052), 10% by mass of high melt tension polypropylene (“Waymax” MFX8), and 10% by mass of the tackifier “Alcon” M115.
  • a laminated film was obtained in the same manner as in Example 1 except that the percentage was set to%.
  • the composition constituting the resin layer A contains 70% by mass of a styrene elastomer (“Tough Tech” H1052), 10% by mass of high melt tension polypropylene (“Waymax” MFX8), and 10% by mass of the tackifier “Arcon” M115.
  • a laminated film was obtained in the same manner as in Example 1 except that the content was 10% by mass and the amount of the olefin elastomer (“Absorter” EP-1001) was 10% by mass.
  • the composition constituting the resin layer A contains 79.5% by mass of a styrene-based elastomer (“Tough Tech” H1052), 10% by mass of high melt tension polypropylene (“Waymax” MFX8), and a tackifier “Arcon” M115.
  • a laminated film was obtained in the same manner as in Example 1 except that 10% by mass and 0.5% by mass of a commercially available ethylene bisstearic acid amide (EBSA) were used.
  • EBSA ethylene bisstearic acid amide
  • Example 7 Among the compositions constituting the resin layer A, instead of high melt tension polypropylene (“Waymax” MFX8), high density polyethylene (“Nipolon Hard” 7300A manufactured by Tosoh, density 952 kg / m 3 , MFR 2 g / 10 minutes, G' A laminated film was obtained in the same manner as in Example 1 except that (25)> 10 MPa and tan ⁇ (25) ⁇ 0.5) were used.
  • the composition constituting the resin layer A contains 70% by mass of a styrene-based elastomer (“Tough Tech” H1052), 15% by mass of high melt tension polypropylene (“Waymax” MFX8), and 15% by mass of a tackifier “Arcon” P125.
  • a laminated film was obtained in the same manner as in Example 1 except that the percentage was set to% (manufactured by Arakawa Chemical Industries, aromatic copolymer, softening point 125 ° C., hydrogenation rate ⁇ 90%).
  • Example 9 A laminated film was obtained in the same manner as in Example 1 except that the thickness of the resin layer A was 2.8 ⁇ m.
  • the composition constituting the resin layer A was composed of 70% by mass of a styrene-based elastomer (“Tough Tech” H1052), high melt tension polypropylene (“Waymax” EX8000, MFR 1.5 g / 10 minutes, G'(25)> 10 MPa, 15% by mass of tan ⁇ (25) ⁇ 0.5), 5% by mass of tackifier "Arcon” M115, tackifier "FTR” 8100 (manufactured by Mitsui Chemicals, aromatic copolymer, softening point 100 ° C., A laminated film was obtained in the same manner as in Example 1 except that the water addition ratio ⁇ 90%) was set to 5% by mass.
  • Example 1 The laminated film is the same as in Example 1 except that the composition constituting the resin layer A is 90% by mass of the styrene elastomer (“Tough Tech” H1052) and 10% by mass of the tackifier “Alcon” M115. Got
  • composition constituting the resin layer A contains 94% by mass of a styrene elastomer (“Tough Tech” H1052), 5% by mass of high melt tension polypropylene (“Waymax” MFX8), and a commercially available ethylene bisstearic acid amide (EBSA). ) was set to 1% by mass, and a laminated film was obtained in the same manner as in Example 1.
  • the composition constituting the resin layer A contains 69% by mass of a styrene-based elastomer (“Tuftec” H1052), 15% by mass of high melt tension polypropylene (“Waymax” MFX8), and a tackifier (“Arcon” M115).
  • a laminated film was obtained in the same manner as in Example 1 except that 15% by mass, commercially available ethylene bisstearic acid amide (EBSA) was 1% by mass, and the thickness of the resin layer A was 2.5 ⁇ m.
  • EBSA ethylene bisstearic acid amide
  • the composition constituting the base material is a resin layer containing 97% by mass of homopolypropylene (manufactured by Sumitomo Chemical Co., Ltd., "Nobrene” FLX80E4, MFR 8 g / 10 minutes) and 3% by mass of a styrene elastomer ("Tuftec” H1052).
  • the composition constituting A was the same as in Example 1 except that the styrene-based elastomer (“Tuftec” H1052) was 20% by mass and the olefin-based elastomer (“Absorter” EP-1001) was 80% by mass. A laminated film was obtained.
  • composition constituting the resin layer A is composed of 70% by mass of a styrene-based elastomer (“Tough Tech” H1052), high melt tension polypropylene (“Waymax” MFX3, MFR 9 g / 10 minutes, G'(25)> 10 MPa, tan ⁇ ( 25)
  • a laminated film was obtained in the same manner as in Example 1 except that ⁇ 0.5) was 15% by mass and the tackifier "Alcon" M115 was 15% by mass.
  • Examples 1 to 9 satisfying the requirements of the present invention were laminated films having good adhesiveness to any adherend, having little dependence on the adherend, and having excellent adhesion suppression.
  • Comparative Examples 1 and 2 were laminated films having high adhesive force to the adherend X, poor dependence on the adherend, and more easily adhering. Further, in Comparative Example 3, the stickiness to the adherend Y was insufficient.
  • Comparative Example 4 was a laminated film in which the adhesiveness to the adherend Y was insufficient and the adhesive was easily promoted.
  • the laminated film of the present invention is excellent in adhesive properties such as dependence on an adherend, it is preferably used as a surface protective film for products made of various materials such as synthetic resin, metal, and glass having various surface shapes. it can.

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Abstract

L'invention concerne un film stratifié doté d'excellentes propriétés d'attachement à un support, qui présente une force adhésive uniforme vis-à-vis d'un support ayant des profiles de surface différents, et qui permet une mise en œuvre de manière universelle. Plus précisément, l'invention concerne un film stratifié qui possède un substrat, et une couche de résine (A) du côté d'au moins une des faces de celui-ci, et qui satisfait les conditions (a), (b) et (c).　(a) La valeur maximale d'adhérence de sonde (F) à 23°C côté couche de résine (A), est supérieure ou égale à 0,2 g／ｍｍ２ et inférieure ou égale à 2,5ｇ／ｍｍ２.　(b) Le rapport （ｈｐ／ｈｍ） du déplacement résiduel (ｈｐ)（en μｍ）et du déplacement maximal (ｈｍ) （en μｍ） lors d'un test de charge/décharge par nanopénétration selon une charge maximale de １ｍＮ à 26°C côté couche de résine (A), est supérieur ou égal à 0,50 et inférieur ou égal à 0,90.　(c) La couche de résine (A) présente un point de fusion (Tm) supérieur ou égal à 50°C.
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