JP4435109B2 - Protective sheet for punching process and method for producing hard coat film for optical recording medium - Google Patents

Description

  The present invention relates to a punching protective sheet used when punching a hard coat film and a method for producing a hard coat film for an optical recording medium.

  In a recently developed Blu-ray Disc, a recording density is improved by using a short wavelength laser and a lens with a high aperture ratio in order to realize a high recording capacity of 25 GB.

  In the same way as existing optical disks (CD, DVD, etc.), a Blu-ray disc has a cover film made of polycarbonate adhered to the information recording layer in order to protect the information recording layer. Has a very large capacity and high density, and even if the cover film is slightly scratched, an error may occur in reading or writing information. Therefore, a hard coat layer for surface protection is indispensable. It has become.

In general, a cover film is attached to an information recording layer or the like of an optical disc after being punched into a shape of an optical disc, that is, a donut shape, or half cut on a release sheet (Patent Document 1).
JP 2004-35836 A

However, among the above cover films, in the hard coat film having a hard coat layer , since the blade is directly contacted with the hard coat layer in the above punching process and is cut, a fine crack occurs in the hard coat layer, There was a problem that the fragments became foreign matter and mixed into the product, resulting in a decrease in yield and productivity.

  The present invention has been made in view of such a situation, and a protective sheet for punching processing that can prevent and reduce cracks generated in a hard coat layer during the punching process of a hard coat film, and a hard disk for an optical recording medium It aims at providing the manufacturing method of a coat film.

In order to achieve the above object, first, when the hard coat film having an optical recording medium hard coat layer is subjected to a punching process to obtain a hard coat film for an optical recording medium, A protective sheet for punching that is placed on or attached to the substrate, wherein the thickness of the base of the protective sheet for punching is 30 to 120 μm, and the hardness of the base of the protective sheet for punching is 0.1 GPa Provided is a punching protective sheet characterized in that the adhesive strength to the hard coat layer is 1500 mN / 25 mm or less ( Invention 1).

  The “optical recording medium” in this specification refers to a medium on which information can be optically recorded / reproduced, and is mainly a read-only, write once or rewritable disc-like medium (eg, CD, CD-ROM, CD-R, CD-RW, DVD, DVD-ROM, DVD-R, DVD-RW, DVD-RAM, LD, Blu-ray Disc, HD DVD, MO, etc .; Including)), but is not necessarily limited thereto.

  In this specification, “sheet” includes the concept of a film, and “film” includes the concept of a sheet.

The punching protective sheet according to the invention ( Invention 1) may be composed only of a base material ( Invention 2), or may be composed of a base material and an adhesive layer ( Invention 3). ).

If the protective sheet for punching according to the above invention ( Inventions 1 to 3) is placed or pasted on the hard coat layer of the hard coat film and punching is performed, the impact of the insert blade during the punching process is removed. Since it relaxes, cracks hardly occur in the hard coat layer.

Secondly, the present invention includes a hard coat film provided with a hard coat layer of an optical recording medium, and the punching protective sheet (inventions 1 to 3) placed or stuck on the hard coat layer. A hard coat film with a protective sheet is provided ( Invention 4).

When the hard coat film with a protective sheet according to the above invention ( invention 4) is subjected to punching as it is, the protective sheet for punching eases the impact of the blade at the time of punching, so that the hard coat layer is hardly cracked. .

Thirdly, the present invention comprises a hard coat film provided with a hard coat layer of an optical recording medium, and the protective sheet for punching (invention 1 to 3) placed or stuck on the hard coat layer, Provided is a hard coat film with a protective sheet, wherein the protective sheet for punching processing is punched into the shape of an optical recording medium in a state where the protective sheet is placed or stuck on the hard coat layer ( Invention 5).

In the hard coat film with a protective sheet according to the invention ( Invention 5), the protective sheet for punching process can relieve the impact of the blade during the punching process, so that the hard coat layer has few cracks.

4thly this invention mounts or affixes the said protection sheet for a punching process ( invention 1-3) on the said hard-coat layer of the hard-coat film provided with the hard-coat layer of the optical recording medium, and the said for a punch process Provided is a method for producing a hard coat film for an optical recording medium, wherein the hard coat film is punched through a protective sheet ( Invention 6).

According to the said invention ( invention 6), since the protective sheet for punching process eases the impact of the blade at the time of punching process, it is hard to generate | occur | produce a crack in a hard-coat layer.

  According to the present invention, it is possible to prevent or reduce cracks generated in the hard coat layer during the hard coat film punching process, and to improve the yield / productivity of the hard coat film for an optical recording medium and thus the optical recording medium. it can.

Hereinafter, embodiments of the present invention will be described.
[Punching protection sheet]
The protective sheet for punching according to the present embodiment (hereinafter may be simply referred to as “protective sheet”) is for preventing or reducing cracks generated in the hard coat layer during punching of the hard coat film.

  As shown in FIG. 1 (a), the protective sheet 1a according to the first embodiment of the present invention is composed only of the base material 11, and the protective sheet 1b according to the second embodiment of the present invention is As shown in FIG.1 (b), it consists of the base material 11 and the adhesive layer 12 laminated | stacked on the single side | surface (lower surface in FIG. 1) of the base material 11. As shown in FIG. Hereinafter, the protective sheet 1a and the protective sheet 1b may be collectively referred to as the protective sheet 1.

  In any case of the protective sheet 1a and the protective sheet 1b, the thickness of the substrate 11 is 30 to 120 μm, the hardness of the substrate 11 is 0.1 GPa or less, and the adhesive force to the hard coat layer is 1500 mN / 25 mm or less. It is necessary to be.

  When the thickness of the base material 11 is less than 30 μm, the impact of the blade at the time of the punching process is not relaxed by the protective sheet 1, so that the hard coat layer crack preventing effect cannot be obtained. On the other hand, if the thickness of the substrate 11 exceeds 120 μm, the protective sheet 1 is greatly deformed during the punching process, and the stress applied to the hard coat layer is increased, so that the hard coat layer crack preventing effect cannot be obtained. A preferable thickness of the substrate 11 is 40 to 100 μm, and a particularly preferable thickness is 40 to 80 μm.

  In addition, when the hardness of the base material 11 exceeds 0.1 GPa, the ability to relieve the impact of the blade during the punching process is reduced, and the followability to the hard coat layer is also reduced. Cannot be obtained. The preferable hardness of the base material 11 is 0.01 to 0.08 GPa, and the particularly preferable hardness is 0.01 to 0.03 GPa.

  Here, in the present invention, since the blade for punching is inserted into the hard coat film via the protective sheet for punch processing, the hardness at the beginning of the blade is important for preventing cracks in the hard coat layer. The degree of ability to mitigate the impact of the blade can be expressed by the hardness. As the hardness, hardness by an indentation test is suitable, and in the present invention, the hardness was measured by a nanoindenter capable of measuring the hardness of the substrate surface. The nano indenter is a measuring device that pushes a triangular pyramid indenter made of a diamond tip into a material surface and obtains hardness (hardness by an indentation test) from a load applied to the indenter and a projected area under the indenter.

  On the other hand, if the adhesive strength of the protective sheet 1 to the hard coat layer exceeds 1500 mN / 25 mm, the adhesive layer 12 causes cohesive failure, and the adhesive is transferred to the hard coat layer, resulting in a decrease in yield and productivity. The preferable adhesive force with respect to the hard-coat layer of the protective sheet 1 is 0-1250 mN / 25mm, and an especially preferable adhesive force is 0-600mN / 25mm. In addition, the adhesive force in this specification shall be shown by the value by the measuring method in the test example mentioned later, and is a value measured similarly also in the protective sheet 1a which does not have the adhesive layer 12. FIG.

  The material of the base material 11 is not particularly limited as long as it satisfies the above conditions. For example, polyolefin such as polyethylene and polypropylene; polyurethane; polyvinyl chloride; polyvinyl acetate; ethylene vinyl acetate copolymer; A film mainly composed of a resin such as a thermoplastic elastomer containing a component such as polyolefin, polyurethane, polystyrene, polyvinyl chloride, or polyester, or a laminated film thereof can be used. The resin film may have self-adhesiveness or may not have self-adhesiveness.

  Further, the material of the pressure-sensitive adhesive layer 12 used in the protective sheet 1b is not particularly limited as long as it satisfies the above conditions. For example, acrylic, polyester, urethane, rubber, silicone, An adhesive such as ethylene-vinyl acetate can be used, and an energy ray-curable adhesive may be used.

  The thickness of the pressure-sensitive adhesive layer 12 is preferably 0 to 80 μm, and particularly preferably 0 to 70 μm.

  The protective sheet 1b can be manufactured by a conventional method. For example, a coating agent containing a pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 12 and, if desired, a solvent is prepared, and a kiss roll coater, a reverse roll coater, a knife It is applied to one side of the substrate 11 by a coating machine such as a coater, roll knife coater, die coater or the like. You just need to match.

  A release sheet may be laminated on the pressure-sensitive adhesive layer 12 of the protective sheet 1b. The release sheet is not particularly limited. For example, a film made of a resin such as polyethylene terephthalate, polypropylene, or polyethylene or a foamed film thereof, a paper such as a glassine paper, a coated paper, or a laminate paper, A system and a release agent such as a long chain alkyl group-containing carbamate can be used. The thickness of the release sheet is usually about 10 to 250 μm, preferably about 20 to 200 μm.

[Method for producing hard coat film for optical recording medium]
In the method for producing a hard coat film for an optical recording medium according to the present embodiment, as shown in FIG. 2, the substrate film 21 and one surface of the substrate film 21 (upper surface in FIG. 2) are formed in advance. The hard coat film 2 comprising the hard coat layer 22, the pressure-sensitive adhesive layer 23 laminated on the other surface (the lower surface in FIG. 2) of the base film 21, and the release sheet 24 laminated on the pressure-sensitive adhesive layer 23. Manufacturing.

  The base film 21 usually has sufficient light transmittance with respect to the wavelength range of light for reading or writing information, and has moderate rigidity and flexibility in order to easily manufacture an optical disc. In addition, a material that is stable with respect to temperature is used for storing the optical disk. As such a base film 21, a light transmissive film made of polycarbonate, cycloolefin-based polymer or polymethyl methacrylate is preferably used.

  The thickness of the base film 21 is determined according to the type of the optical disk and the thickness of other components of the optical disk, but is usually about 10 to 300 μm, preferably about 20 to 150 μm, and more preferably. It is about 25-100 micrometers.

  The hard coat layer 22 is not particularly limited. For example, the composition described in JP 2005-133026 A, that is, an organic compound having one or more polymerizable unsaturated groups in the molecule in the inorganic oxide particles. Are chemically bonded reactive particles, a monomer or oligomer of an organic compound having two or more polymerizable unsaturated groups in the molecule, and a weight having one or more polymerizable unsaturated groups in the molecule. It can be formed by applying a composition containing an organic compound having an average molecular weight of 1500 or more and, if desired, a siloxane compound having a dimethylsiloxane skeleton to the surface of the base film 21 and curing it. When using the said composition, it is preferable that the thickness of the hard-coat layer 22 is 2-20 micrometers, and it is especially preferable that it is 5-10 micrometers.

  The pressure-sensitive adhesive layer 23 is not particularly limited, and can be formed by a commonly used pressure-sensitive adhesive such as acrylic, urethane, or silicone. The thickness of the pressure-sensitive adhesive layer 23 is usually about 5 to 60 μm, preferably about 10 to 30 μm.

  The release sheet 24 is not particularly limited, and for example, the same release sheet that can be laminated on the pressure-sensitive adhesive layer 12 of the protective sheet 1b described above can be used.

  The said hard coat film 2 can be manufactured by a conventional method. For example, a hard coat layer 22 is formed on one side of the base film 21, while a coating agent containing a pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer 23 and, if desired, further a solvent is prepared, and a kiss roll coater and a reverse roll coater The pressure-sensitive adhesive layer 23 is formed by coating the release sheet 24 with a coating machine such as a knife coater, a roll knife coater, or a die coater to form the pressure-sensitive adhesive layer 23, and the hard coat layer in the base film 21. What is necessary is just to bond the surface on the opposite side of 22.

  Next, the hard coat film 2 is punched into a desired optical recording medium shape, for example, a donut shape. At that time, as shown in FIG. 2, the protective sheet 1 is placed on the hard coat layer 22 of the hard coat film 2 (when the protective sheet 1 does not have adhesiveness) or pasted (the protective sheet 1 has adhesiveness). Then, the blade C is inserted into the hard coat film 2 through the protective sheet 1. In addition, when the protective sheet 1 is affixed to the hard coat layer 22, it is possible to prevent foreign matters from entering between the protective sheet 1 and the hard coat layer 22, and to further improve productivity.

  By the above punching process, the hard coat film 2 may be completely punched out, or a half cut that cuts halfway through the release sheet 24 may be performed. Further, the outer peripheral portion of the donut shape may be half cut, and the inner peripheral portion (center hole) may be punched out. Such punching can be performed using a punching device equipped with a die cut roll or the like.

  By performing the punching process as described above, a hard coat film for an optical recording medium can be obtained. In this method, the protective sheet 1 is present on the hard coat layer 22, and the blade C is formed on the hard coat layer 22. Since the impact of the blade is mitigated by the protective sheet 1 without direct contact, cracks are unlikely to occur in the hard coat layer 22. That is, according to this method, cracks generated in the hard coat layer 22 can be prevented or reduced, and the yield and productivity of the hard coat film for optical recording media, and consequently the optical recording media, can be improved.

  As an example, in order to produce an optical disc (single-sided single layer) using the hard coat film for optical recording media obtained as described above, the release sheet 24 of the hard coat film for optical recording media is peeled off. The exposed adhesive layer 23 and the information recording layer formed on the concavo-convex surface of the donut-shaped optical disk substrate may be bonded together.

  The embodiment described above is described for facilitating understanding of the present invention, and is not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

  For example, the hard coat film 2 may be composed only of the base film 21 and the hard coat layer 22. In this case, the optical recording medium can be manufactured by separately applying and forming the pressure-sensitive adhesive layer on the base film 21 side or the information recording layer side.

  EXAMPLES Hereinafter, although an Example etc. demonstrate this invention further more concretely, the scope of the present invention is not limited to these Examples etc.

[Example 1]
Reactive particles obtained by chemically bonding an organic compound having one or more polymerizable unsaturated groups in the molecule to silica fine particles, and a mixture of organic compounds having two or more polymerizable unsaturated groups in the molecule Hard coat agent (manufactured by JSR, Desolite Z7524, containing polymerization initiator, solid content concentration: 75% by weight) and urethane acrylate having a weight average molecular weight of 3500 (manufactured by Nippon Synthetic Chemical Industry, UV-7000B, 10 parts by weight of solid content concentration: 100% by weight) and 0.1 part by weight of a siloxane compound having a dimethylsiloxane skeleton (Toray Dow Corning Silicone, SH28PA, solid content concentration: 100% by weight) Further, ethyl cellosolve is added as a diluent solvent so that the solid content concentration becomes 40% by weight, and this is added to the coating for the hard coat layer. It was the ring for the composition.

The thickness of the coating composition obtained after drying by a bar coater # 12 on one surface of a polycarbonate film (manufactured by Teijin Kasei Co., Ltd., Pure Ace C110-75, thickness: 75 μm) as a base film. After coating to 5 μm and drying at 70 ° C. for 1 minute, ultraviolet rays were irradiated (irradiation conditions: illuminance: 310 mW / cm ² , light amount: 300 mJ / cm ² ) to form a hard coat layer.

  On the other hand, an acrylic pressure-sensitive adhesive (manufactured by Lintec, LS231KP) was applied to the release surface of a release sheet (manufactured by Lintec Corporation, SP-PET 381031, thickness: 38 μm) on one side of the polyethylene terephthalate film. It was coated with a knife coater so that the thickness after drying was 20 μm, and dried at 100 ° C. for 3 minutes. The pressure-sensitive adhesive layer thus formed was subjected to pressure bonding by overlapping the surface opposite to the surface on which the hard coat layer was formed of the base film on which the hard coat layer was formed, to obtain a hard coat film with a pressure-sensitive adhesive layer. .

  Next, on the hard coat layer of the hard coat film, a polyurethane sheet (manufactured by Seiko Kasei Co., Ltd., rack skin F4258-40C) is placed as a protective sheet, and a punching device (manufactured by Mark Andy Co., Mark Andy 910) is used. The hard coat film was punched out into a donut shape (outer diameter: 120 mm, inner diameter: 15 mm) through the protective sheet to obtain a hard coat film for an optical disk.

[Example 2]
A hard coat film for an optical disk was manufactured in the same manner as in Example 1 except that a polyethylene sheet (manufactured by J Film Co., Ltd., PE Wadatome Kaikai 7) was used as the protective sheet.

Example 3
A hard coat film for an optical disk was produced in the same manner as in Example 1 except that a polyvinyl chloride sheet (manufactured by Lintec Corporation, SK901) was used as the protective sheet.

Example 4
As a protective sheet, a two-layer sheet consisting of a polyethylene layer and a polyvinyl acetate layer (manufactured by Sanei Kaken Co., Ltd., PAC3-70) is used so that the polyvinyl acetate layer (with self-adhesiveness) is in contact with the hard coat layer. A hard coat film for an optical disk was produced in the same manner as in Example 1 except that.

Example 5
As a protective sheet, a two-layer sheet comprising a polyethylene layer and a polyvinyl acetate layer (manufactured by Sanei Kaken Co., Ltd., PAC3-70) is used except that the polyethylene layer (without self-adhesiveness) is in contact with the hard coat layer. In the same manner as in Example 1, an optical disk hard coat film was produced.

Example 6
A hard coat film for an optical disk was produced in the same manner as in Example 1 except that a polyester-based thermoplastic elastomer sheet (manufactured by Kurashiki Boseki Co., Ltd., ES-9300BK) was used as the protective sheet.

Example 7
As a protective sheet, a two-layer sheet (manufactured by Achilles Co., Ltd., HUSL1301) composed of a polyethylene-methacrylic acid copolymer layer and a polyethylene layer is used as in Example 1 except that the polyethylene layer is in contact with the hard coat layer. Thus, a hard coat film for an optical disk was produced.

Example 8
A hard coat film for an optical disk was produced in the same manner as in Example 1 except that a polyurethane sheet (manufactured by Seiko Kasei Co., Ltd., rack skin F5895P-100C) was used as the protective sheet.

Example 9
As a protective sheet, an acrylic pressure-sensitive adhesive (manufactured by Lintec Co., Ltd., LS231KP) is applied to the surface of the polyvinyl acetate layer side of a two-layer sheet (SANA Kaken Co., Ltd., PAC3-70) comprising a polyethylene layer and a polyvinyl acetate layer A hard coat film for an optical disk was produced in the same manner as in Example 1 except that a 20 μm thick adhesive layer was formed so that the adhesive layer was in contact with the hard coat layer.

Example 10
As a protective sheet, from an acrylic adhesive (Lintec Corporation, LS349MP) on the surface of the polyvinyl acetate layer side of a two-layer sheet (SANA Kaken Co., Ltd., PAC3-70) consisting of a polyethylene layer and a polyvinyl acetate layer. A hard coat film for an optical disk was produced in the same manner as in Example 1 except that a 20 μm thick adhesive layer was formed so that the adhesive layer was in contact with the hard coat layer.

Example 11
A hard coat film for an optical disk was produced in the same manner as in Example 9, except that the protective sheet was obtained by changing the thickness of the pressure-sensitive adhesive layer of Example 9 to 40 μm.

Example 12
A hard coat film for an optical disk was produced in the same manner as in Example 9, except that the protective sheet used in Example 9 was obtained by changing the thickness of the pressure-sensitive adhesive layer to 60 μm.

[Comparative Example 1]
A hard coat film for an optical disk was produced in the same manner as in Example 1 except that no protective sheet was used.

[Comparative Example 2]
As a protective sheet, a UV curable acrylic pressure-sensitive adhesive (LSTEC, LS313JP) was applied to one side of a polyethylene terephthalate sheet (Mitsubishi Chemical Polyester Film, PET25 T-100) with a thickness of 10 μm and irradiated with ultraviolet rays ( Irradiation conditions: illuminance 240 mW / cm ² , light quantity 90 mJ / cm ² ) For an optical disc in the same manner as in Example 1 except that an adhesive layer formed so that the adhesive layer is in contact with the hard coat layer is used. A hard coat film was produced.

[Comparative Example 3]
As a protective sheet, a two-layer sheet (Seiko Kasei Co., Ltd., rack skin F4150-25HM) composed of a polyurethane layer and a polyethylene layer (with self-adhesiveness) is used except that the polyethylene layer is in contact with the hard coat layer. A hard coat film for an optical disk was produced in the same manner as in Example 1.

[Comparative Example 4]
A hard coat film for an optical disk was produced in the same manner as in Example 1 except that a polypropylene sheet (manufactured by Oji Paper Co., Ltd., Alphan PP40) was used as the protective sheet.

[Comparative Example 5]
As a protective sheet, a double-sided tape (manufactured by Fuji Sangyo Co., Ltd., # 101, thickness) A hard coat film for an optical disk was produced in the same manner as in Example 1, except that the double-coated tape was used with the double-sided tape attached to the hard coat layer.

[Comparative Example 6]
As a protective sheet, two two-layer sheets (SANA Chemical Co., Ltd., PAC3-70) composed of a polyethylene layer and a polyvinyl acetate layer are stacked so that the polyvinyl acetate layer (with self-adhesiveness) is in contact with the hard coat layer. A hard coat film for an optical disc was produced in the same manner as in Example 1 except that the hard coat film was used.

[Test example]
1. Measurement of Thickness The thickness of the base material and the pressure-sensitive adhesive layer of the protective sheet used in Examples or Comparative Examples was measured using a constant pressure thickness measuring instrument (manufactured by TECLOCK Corporation, PG-02). The results are shown in Table 1.

2. Measurement of Adhesive Strength A hard coat film with a protective sheet prepared in Examples or Comparative Examples (with a protective sheet placed or pasted on the hard coat layer of the hard coat film) was formed into a strip with a width of 25 mm, and this was a test piece. It was. Using TENSILON manufactured by ORIENTEC, the protective sheet is peeled off at a speed of 300 mm / min in the direction of 180 ° from the hard coat film of the test piece in an environment of 23 ° C. and 50% Rh. Was measured. The results are shown in Table 1.

3. Measurement of Hardness The protective sheet used in Examples or Comparative Examples was conditioned at 23 ° C. and 50% Rh for 1 week, then cut into 10 mm × 10 mm, and used as a sample. The obtained sample was fixed on a glass plate adhered to an aluminum pedestal, and a thickness direction of 0. 0 in the thickness direction from the surface of the base material by a nanoindenter (manufactured by MTS, model name “NanoIndentor Test Works-4”). The hardness at a position of 2 μm was measured. The results are shown in Table 1.

4). Measurement of presence or absence of cracks The inner peripheral cut surface of the hard coat film for optical disks obtained in Examples or Comparative Examples was observed with a digital microscope (VHX-100, manufactured by Keyence Co.) to confirm the presence or absence of cracks (cracks). The results are shown in Table 1. A case where no crack was generated is indicated by ○, and a case where a crack was generated is indicated by ×.

  As is clear from Table 1, no cracks were generated in the hard coat film for optical disks that satisfies the conditions of the present invention.

  The present invention is suitable for producing a hard coat film used for an optical disc such as a Blu-ray disc.

It is sectional drawing of the protection sheet for punching which concerns on the 1st Embodiment and 2nd Embodiment of this invention. It is sectional drawing which shows the manufacturing method of the hard coat film for optical recording media which concerns on one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,1a, 1b ... Punching protection sheet 11 ... Base material 12 ... Adhesive layer 2 ... Hard coat film 21 ... Base film 22 ... Hard coat layer 23 ... Adhesive layer 24 ... Release sheet C ... Blade

Claims (6)

When a hard coat film provided with a hard coat layer of an optical recording medium is subjected to a punching process to obtain a hard coat film for an optical recording medium, the protective sheet for the punching process is placed on or stuck to the hard coat layer. ,
The thickness of the base material of the punching protection sheet is 30 to 120 μm,
The hardness of the base material of the protective sheet for punching processing is 0.1 GPa or less,
A protective sheet for punching, characterized in that the adhesive strength to the hard coat layer is 1500 mN / 25 mm or less.   The protective sheet for punching according to claim 1, comprising only a base material.   The protective sheet for punching processing according to claim 1, comprising a base material and an adhesive layer. A hard coat film provided with a hard coat layer of an optical recording medium ;
A hard coat film with a protective sheet, comprising: the protective sheet for punching processing according to any one of claims 1 to 3 placed or stuck on the hard coat layer. A hard coat film provided with a hard coat layer of an optical recording medium ;
The protective sheet for punching processing according to any one of claims 1 to 3, which is placed or stuck on the hard coat layer,
A hard coat film with a protective sheet, wherein the protective sheet for punching is punched into the shape of an optical recording medium in a state where the protective sheet is placed or stuck on the hard coat layer. The protective sheet for punching according to any one of claims 1 to 3 is placed or affixed to the hard coat layer of a hard coat film provided with a hard coat layer of an optical recording medium ,
A method for producing a hard coat film for an optical recording medium, wherein the hard coat film is subjected to a punching process through the punching protective sheet.

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