CN109143423B - Covering film - Google Patents

Covering film Download PDF

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CN109143423B
CN109143423B CN201810629458.1A CN201810629458A CN109143423B CN 109143423 B CN109143423 B CN 109143423B CN 201810629458 A CN201810629458 A CN 201810629458A CN 109143423 B CN109143423 B CN 109143423B
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coat layer
hard coat
film
meth
acrylate
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CN109143423A (en
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松原圭佑
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Gunze Ltd
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Gunze Ltd
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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
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/043—Improving the adhesiveness of the coatings per se, e.g. forming primers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/14—Protective coatings, e.g. hard coatings
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/536—Hardness

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  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Organic Chemistry (AREA)
  • Nonlinear Science (AREA)
  • Polymers & Plastics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Theoretical Computer Science (AREA)
  • Laminated Bodies (AREA)
  • Coating Of Shaped Articles Made Of Macromolecular Substances (AREA)
  • Surface Treatment Of Optical Elements (AREA)

Abstract

The present invention addresses the problem of providing a cover film for a curved display panel that satisfies both bending resistance and scratch resistance. The solution of the invention is: a cover film for a curved display panel is provided, which has a transparent base film and a hard coat layer formed on at least one surface of the transparent base film, wherein the hard coat layer is formed of an ionizing radiation-curable resin, and the thickness of the hard coat layer is 2 [ mu ] m or less.

Description

Covering film
Technical Field
The present invention relates to a cover film.
Background
In recent years, various cover films for protecting the surface of a display screen of a smartphone or the like have been proposed. For example, patent documents 1 and 2 propose a cover film having a film base material and a hard coat layer formed on the surface thereof.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 2008-133352
Patent document 2: japanese patent No. 6010992
Disclosure of Invention
Problems to be solved by the invention
However, in recent years, a curved display panel in which the surface of the display panel is curved (or flexed) has been proposed. In such a display panel, the cover film disposed on the surface is also curved, and therefore, the cover film is required to have bending resistance. That is, when the cover film is bent, it is necessary to prevent cracks from occurring particularly in the hard coat layer. Further, the cover film is also required to have scratch resistance, and the surface is also required to be less likely to be scratched. However, the hard coat films described in patent documents 1 and 2 do not have sufficient performance to satisfy these requirements. The present invention has been made to solve the above problems, and an object of the present invention is to provide a cover film for a curved display panel that satisfies both bending resistance and scratch resistance.
Means for solving the problems
An overlay film for a curved display screen, the overlay film comprising:
a transparent substrate film; and
a hard coat layer formed on at least one surface of the transparent base film,
the hard coat layer is formed of an ionizing radiation curing type resin,
the thickness of the hard coat layer is 2 μm or less.
An overlay film for a curved display screen, the overlay film comprising:
a transparent substrate film; and
a hard coat layer formed on at least one surface of the transparent base film,
the thickness of the base material film is 25 to 300 μm,
the hard coat layer is formed of an ionizing radiation curing type resin,
the thickness of the hard coating layer is 0.5 to 1.0 μm,
the hard coating has a Martensitic hardness of 500N/mm2In the above-mentioned manner,
the hard coat layer has a Martensitic hardness of 0.8 to 2.6 relative to the Martensitic hardness of the base material film.
An overlay film for a curved display screen, the overlay film comprising:
a transparent substrate film; and
a hard coat layer formed on at least one surface of the transparent base film,
the thickness of the base material film is 25 to 300 μm,
the hard coat layer is formed of an ionizing radiation curing type resin,
the thickness of the hard coat layer is 2.0 μm or less,
the hard coating has a Martensitic hardness of 500N/mm2In the above-mentioned manner,
the hard coat layer has a Martensitic hardness of 0.8 to 2.6 relative to the Martensitic hardness of the base material film.
The cover film according to any one of claims 1 to 3, wherein the hard coat layer contains a fluorine-based additive.
The cover film according to any one of items 1 to 4, wherein the hard coat layer has a minimum diameter of less than 6mm of a mandrel having cracks in the hard coat layer by a cylindrical mandrel method defined in JIS 5006-5-1.
The cover film according to any one of claims 1 to 5, wherein the hard coat layer is formed at 60gf/cm2The steel wool #0000 was reciprocated at 3cm/sec 1 or more without causing any flaw.
Effects of the invention
The cover film according to the present invention can satisfy both of the bending resistance and the scratch resistance.
Detailed Description
One embodiment of the cover film according to the present invention is described below. The cover film of the present invention has a transparent substrate film and a hard coat layer laminated on at least one side of the substrate film. The respective components are explained in detail below.
< 1. substrate film >
The substrate film according to the present invention may be formed of various transparent materials, and may be formed of, for example, cellulose acylate, cycloolefin polymer, polycarbonate, acrylate polymer, polyester, polyimide, or the like. Polyimide is particularly preferable because it has high bending resistance and is less likely to cause wrinkles when bent. In addition, various additives may be added to the base film as needed. For example, various additives such as a plasticizer, an antistatic agent, and an ultraviolet absorber may be added.
The thickness of the base film is preferably 25 μm to 300 μm, and more preferably 75 μm to 250 μm. This is because when the thickness is less than 25 μm, sufficient scratch resistance cannot be obtained on the surface of the hard coat layer, and when it exceeds 300 μm, sufficient bending durability cannot be obtained.
In addition, the substrate film preferably has 200 to 600N/mm in the March hardness test2The hardness of (b) is more preferably 250 to 500N/mm2The hardness of (b) is particularly preferably 300 to 450N/mm2The hardness of (2). This improves the scratch resistance.
The Martensitic hardness can be measured by a dynamic ultra micro hardness tester DUH-211 (Shimadzu corporation). The indenter was measured under the conditions of an indentation depth of 0.25 μm and a load velocity of 0.15mN/sec using a triangular suction indenter having an angle between edges of 115 degrees. The specific mahalanobis hardness is a value calculated by the following equation.
Ma hardness [ N/mm ]2]Load [ mu N ═ load]/(24.5X (maximum depth hmax (μm))2)
< 2. hard coating >
Next, the hard coat layer will be described. The hard coat layer is a layer obtained by curing a resin composition for forming a hard coat layer containing an ionizing radiation curable resin, a photopolymerization initiator, and the like. The composition may contain additives described later as necessary.
< 2-1. ionizing radiation curing resin >
The ionizing radiation curable resin is a compound having a radical polymerizability which is polymerized or crosslinked by an ionizing radiation (ultraviolet ray or electron ray), and may be, for example, a compound having at least 1 or more ethylenically unsaturated bonds in a constituent unit, or a mixture thereof.
Examples of the monofunctional compound having 1 unsaturated bond include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, n-butyl (meth) acrylate, glycidyl (meth) acrylate, and cyclohexyl (meth) acrylate.
Further, as the bifunctional compound having 2 unsaturated bonds, examples of the (meth) acrylate include di (meth) acrylates such as ethylene glycol di (meth) acrylate, diethylene glycol di (meth) acrylate, butylene glycol di (meth) acrylate, hexanediol di (meth) acrylate, nonanediol di (meth) acrylate, ethoxylated hexanediol di (meth) acrylate, propoxylated hexanediol di (meth) acrylate, diethylene glycol di (meth) acrylate, polyethylene glycol di (meth) acrylate, tripropylene glycol di (meth) acrylate, polypropylene glycol di (meth) acrylate, neopentyl glycol di (meth) acrylate, ethoxylated neopentyl glycol di (meth) acrylate, tripropylene glycol di (meth) acrylate, and hydroxypivalic acid neopentyl glycol di (meth) acrylate.
Examples of the polyfunctional compound having 3 or more unsaturated bonds include tri (meth) acrylate such as trimethylolpropane tri (meth) acrylate, ethoxylated trimethylolpropane tri (meth) acrylate, propoxylated trimethylolpropane tri (meth) acrylate, tri 2-hydroxyethyl isocyanate tri (meth) acrylate, glycerol tri (meth) acrylate, etc., 3-functional (meth) acrylate compounds such as pentaerythritol tri (meth) acrylate, dipentaerythritol tri (meth) acrylate, ditrimethylolpropane tri (meth) acrylate, etc., pentaerythritol tetra (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate, dipentaerythritol penta (meth) acrylate, glycerol tri (meth) acrylate, etc, And (meth) acrylate compounds such as polyfunctional (meth) acrylate compounds having 3 or more functions, such as ditrimethylolpropane penta (meth) acrylate, dipentaerythritol hexa (meth) acrylate, and ditrimethylolpropane hexa (meth) acrylate, and polyfunctional (meth) acrylate compounds obtained by substituting a part of these (meth) acrylate with an alkyl group or epsilon-caprolactone.
Further, a urethane resin may be mixed with the (meth) acrylate compound. As the urethane resin, for example, a urethane (meth) acrylate resin can be used. Specifically, as the urethane (meth) acrylate compound, a pentaerythritol triacrylate hexamethylene diisocyanate polyurethane prepolymer, a dipentaerythritol pentaacrylate hexamethylene diisocyanate polyurethane prepolymer, a pentaerythritol triacrylate toluene diisocyanate polyurethane prepolymer, a dipentaerythritol pentaacrylate, a toluene diisocyanate polyurethane prepolymer, a pentaerythritol triacrylate isophorone diisocyanate polyurethane prepolymer, a dipentaerythritol pentaacrylate isophorone diisocyanate polyurethane prepolymer, and the like can be used.
The molecular weight of the polyurethane resin is preferably 1000 to 10000, more preferably 2000 to 5000. In addition, GPC can be used as a method for measuring the molecular weight.
< 2-2. photopolymerization initiator
Examples of the polymerization initiator include α -hydroxyketones such as benzylmethylketal e.g. 2, 2-dimethoxy-1, 2-diphenylethane-1-one, 1-hydroxycyclohexylphenylketone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, α -aminoketones such as 2-methyl-1 [ 4- (methylthio) phenyl ] -2-morpholinopropan-1-one, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) butanone-1, bisacylphosphine oxides such as bis (2, 6-dimethoxybenzoyl) -2, 4, 4-trimethylpentylphosphine oxide, organic azides such as 2,2 ' -bis (o-chlorophenyl) -4, 4 ', 5,5 ' -tetraphenyl-1, 1 ' -biimidazole, bis (2,4, 5-triphenyl) imidazole, N-arylglycines such as N-phenylglycine, organic azides such as 4,4 ' -diazidochalcone, organic azidobenzophenones such as 3,3 ', 4,4 ' -tetra (tert-butylperoxy) 283, and organic peroxides represented by phchn, 2, 7.
Specific examples thereof include iron arene complexes, trihalomethyl-substituted S-triazines, sulfonium salts, diazonium salts, phosphonium salts, selenonium salts, arsonium salts, iodonium salts, and the like. Examples of the iodonium salt include compounds described in Macromolecules, 10, 1307(1977), for example, iodonium chlorides, bromides, fluoroborates, hexafluorophosphates, hexafluoroarsenates, aromatic sulfonates and the like of iodonium such as diphenyliodonium, ditolyiodonium, phenyl (p-anisyl) iodonium, bis (m-nitrophenyl) iodonium, bis (p-tert-butylphenyl) iodonium and bis (p-chlorophenyl) iodonium, and sulfonium coordination compounds such as diphenylphenacylsulfonium (n-butyl) triphenylborate and the like.
< 2-3. additives
If necessary, an additive may be added to the resin composition for forming a hard coat layer. Examples of the additives include silicone-based and fluorine-based additives (e.g., leveling agents) for imparting leveling property, surface smoothness, low water contact angle property, and the like. By adding such an additive, the scratch resistance of the surface of the hard coat layer can be improved. In addition, in photopolymerization, when ultraviolet light is used, the inhibition of curing of the resin by oxygen can be reduced by the penetration of the additive into the air interface. Therefore, an effective degree of curing can be obtained even under low irradiation intensity conditions. The amount of these additives may be 0.01 to 0.5 parts by weight per 100 parts by weight of the resin composition for forming a hard coat layer.
< 3. Property of hard coating layer >
The thickness of the hard coat layer is more than 0.25 μm and less than 3.0. mu.m, preferably 0.5 μm to 1.5. mu.m, and more preferably 0.75 μm to 1.25. mu.m. This is because sufficient scratch resistance cannot be obtained when the thickness is 0.25 μm or less, but is not preferable in terms of bendability when the thickness is 3.0 μm or more.
The hard coating preferably has a hardness of 500N/mm in the March hardness test2The hardness is more preferably 650N/mm2The hardness of the above is particularly preferably 700N/mm2The above hardness. This improves the scratch resistance. On the other hand, the hard coat layer preferably has a Martensitic hardness of 300N/mm2The above. This also makes it possible to improve the abrasion resistance. The mahalanobis hardness can be measured by the method described above.
In order to exhibit high surface hardness even when the hard coat layer has a small film thickness, the hard coat layer needs to have a hardness of about the same degree as the substrate film in terms of mahalanobis hardness. From this viewpoint, the ratio of the mohs hardness (mohs hardness of the hard coat layer/mohs hardness of the base film) is preferably 0.8 to 2.6, more preferably 1.0 to 2.5, and still more preferably 1.2 to 2.4.
Further, it is preferable that the coating film composed of the film base and the hard coat layer does not crack in the hard coat layer when the coating film is formed into a cylinder having a diameter of 6mm or more after being bent by the cylindrical mandrel method (JISK 5600-5-1).
< 4. method for manufacturing coverlay film
The method for producing the cover film according to the present invention is not particularly limited, and for example, a cover film can be obtained by applying a resin composition for forming a hard coat layer on the base film, drying the resin composition, and then curing the resin composition by photopolymerization.
As a method for applying the resin composition for forming a hard coat layer to the base film, for example, a known method such as roll coating, reverse roll coating, gravure coating, knife coating, and bar coating can be used.
The method for drying the applied resin composition for forming a hard coat layer is not particularly limited. For example, a method of passing the substrate film coated with the resin composition for forming a hard coat layer through a dryer may be mentioned. The drying temperature in this case is preferably 40 to 100 ℃.
In addition, ultraviolet rays are preferably used as the ionizing radiation source for curing the coating film, and light sources such as a high-pressure mercury lamp, a low-pressure mercury lamp, an ultrahigh-pressure mercury lamp, a metal halide lamp, a carbon arc, and a xenon arc can be used.
< 5. feature >
According to the coating film of the present embodiment, since the thickness of the hard coat layer is 2.5 μm or less, the bending durability can be improved. That is, even if the hard coat layer is bent, the hard coat layer can be prevented from cracking. Therefore, the cover film can be suitably used as a cover film for a curved display panel.
Examples
Next, examples of the present invention will be explained. However, the present invention is not limited to the following examples.
< 1. production of examples and comparative examples >
The following describes the production of the coating films according to examples 1 to 3 and comparative examples 1 and 2. Examples 1 to 3 and comparative examples 1 and 2 have the same configuration except that the thickness of the hard coat layer is different.
First, a 50 μm thick PET film (U483, manufactured by Toray corporation) was prepared as a base film. Subsequently, a resin composition for forming a hard coat layer was prepared by mixing 100 parts by weight of a hard coat paint (BEAMSET 907, manufactured by Mitsuoka chemical Co., Ltd.) and 1 part by weight of a fluorine-based additive (TEGOrad 2300, manufactured by Evonik industries). Then, the resin composition for forming a hard coat layer was applied to one surface of the base film using a wire bar coater so as to have a thickness as follows. Then, the resin composition for forming a hard coat layer is heat-treated at 80 ℃ for 2 to 5 minutes to dry the diluent solvent, and then the resultant is irradiated with UV light at 200mJ/cm using a UV irradiation apparatus (Heraeus corporation)2The integrated light amount of (2) is solidified.
[ Table 1]
Thickness of hard coat layer
Example 1 2μm
Example 2 1μm
Example 3 0.5μm
Comparative example 1 3μm
Comparative example 2 0.25μm
The Martensitic hardness of the hard coating is 770N/mm2. The Martensitic hardness was measured after a hard coat layer was formed by applying a resin composition for forming a hard coat layer having a thickness of 10 μm on a glass plate and forming the hard coat layer as described above. The composition of the hard coat layer was the same in the examples and comparative examples, and thus the mahalanobis hardness was the same for all of the examples and comparative examples.
< 2. bending resistance evaluation test >
2X 10cm pieces were cut out from the examples and comparative examples prepared as described above using a laser cutting device (SpiritgX 30W manufactured by GCC), and the pieces were bent by a cylindrical mandrel method (JISK 5600-5-1), and then whether or not cracks were generated in the hard coat layer was visually observed. The diameter of the cylinder used was 2mm, 3mm, 4mm, 5mm, 6mm, and 10mm, and the case where no cracks were generated in the hard coat layer was denoted as A, and the case where cracks were generated was denoted as B.
[ Table 2]
Figure BDA0001700115360000081
< 3. scratch resistance evaluation test >
The surfaces of the hard coatings of examples and comparative examples were coated with a coating composition of 60gf/cm2Steel wool #0000 was arranged in a load-bearing manner, and reciprocated 1 time at a speed of 3 cm/sec. This was designated as test 1. Then, whether or not the position of the steel wool after the reciprocating was scratched was visually confirmed. Then, the case where no scar was generated was denoted as a, and the case where a scar was generated was denoted as B. In addition, test 2 was also performed with the test conditions changed. In test 2, the hard coating layers of examples and comparative examples were coated on the surfaces thereof to apply 600gf/cm2Steel wool #0000 was arranged in a load-bearing manner, and reciprocated 1 time at a speed of 6 cm/sec. Then, the presence or absence of a flaw was visually confirmed and evaluated in the same manner as in test 1. The results are as follows.
[ Table 3]
Test 1 Test 2
Example 1 A A
Example 2 A A
Example 3 A B
Comparative example 1 A A
Comparative example 2 B B
< 4. investigation >
As described above, in the bending resistance evaluation test, in the test using the cylinder having a diameter of 6mm or more in the examples, no crack was generated in the hard coat layer. Therefore, it is understood that the cover film according to the embodiment can be applied to a curved display screen having a curved surface with a small curvature radius. In particular, in examples 2 and 3, the hard coat layer did not crack in the test using the cylinder having a diameter of 2 mm. Therefore, it is found that the bending resistance is improved when the thickness of the hard coat layer is small.
In test 1 of the scratch resistance test, no scratch was generated in any of the examples. On the other hand, in the comparative example in which the hard coat layer had a small thickness and was 0.25 μm, a flaw was generated. Therefore, it is understood that the examples in which the thickness of the hard coat layer is 0.5 to 2.0 μm are coating films having both bending resistance and scratch resistance. In addition, in test 2 under more severe conditions, no flaw was generated in both examples 1 and 2. Example 3 is suitable for surface protection applications of machines which are assumed to be used outdoors where dust, sand, or the like easily adheres.

Claims (5)

1. A cover film for a curved display panel, comprising:
a transparent substrate film; and
a hard coat layer formed on at least one surface of the transparent substrate film,
the thickness of the base material film is 25 to 300 μm,
the hard coat layer is formed of an ionizing radiation curing type resin,
the thickness of the hard coating is 0.5-1.0 μm,
the Martensitic hardness of the hard coating is 500N/mm2In the above-mentioned manner,
the hard coating layer has a Martensitic hardness relative to the base material film in a ratio of 0.8 to 2.6.
2. A cover film for a curved display panel, comprising:
a transparent substrate film; and
a hard coat layer formed on at least one surface of the transparent substrate film,
the thickness of the base material film is 25 to 300 μm,
the hard coat layer is formed of an ionizing radiation curing type resin,
the thickness of the hard coating layer is less than 2.0 μm,
the Martensitic hardness of the hard coating is 500N/mm2In the above-mentioned manner,
the hard coating layer has a Martensitic hardness relative to the base material film, and the Martensitic hardness of the hard coating layer is 0.8-2.6.
3. The mulch film according to claim 1 or 2 wherein:
the hard coat layer contains a fluorine-based additive.
4. The mulch film according to claim 1 or 2 wherein:
the hard coat layer has a minimum diameter of less than 6mm of a mandrel generating cracks in the hard coat layer by a cylindrical mandrel method specified in JIS 5006-5-1.
5. The mulch film according to claim 1 or 2 wherein:
the hard coating layer is at 60gf/cm2The steel wool #0000 was reciprocated at 3cm/sec 1 or more without causing any flaw.
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