JP2006344286A - Photocuring transfer disk sheet suitable for manufacture of optical information recording medium, and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a photocuring transfer disk sheet, wherein the change in the disk shape of a disk-shaped photocuring transfer layer, variation of layer thickness thereof and elution of a layer component will not be generated, even in a sheet-rolled state of a long sheet. <P>SOLUTION: In the photocuring transfer disk sheet, wherein laminates each formed by laminating a disk-shaped photocuring transfer layer and a disk-shaped peeling sheet provided thereon are provided in the longitudinal direction, in a region except the regions in the vicinity of both end parts in the width direction on a long-length peeling sheet, spacer layers are provided in the regions, in the vicinity of of the both end parts in the width direction on the surface of the long-length peeling sheet. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to the manufacture of an optical information recording medium in which information such as large-capacity characters, audio, moving images, etc. such as DVD (Digital Versatile Disc) and CD (Compact Disc) is recorded and / or recordable as a digital signal. The present invention relates to a photocurable transfer disk sheet that is advantageously used, and a method for producing the same.

  Audio CDs and CD-ROMs are widely used as recorded optical information recording media with pits formed on the surface as digital signals. Recently, DVDs with pit recording on both sides capable of recording moving images and recordings have been made. It has attracted attention as a next-generation recording medium for CDs and has already been used. Also, CD-R, CD-RW, DVD-R, DVD-RW, etc., which can be recorded by a user in which pits and grooves are formed, have already been used.

  For a DVD having recording layers on both sides, for example, as shown in FIG. 7, reflection layers 71a and 72a are respectively formed on the signal bit forming surfaces of two transparent resin substrates 71 and 72 each having a signal bit formed on one side. In the state in which the reflective layers 71a and 72a face each other, the substrates 71 and 72 are bonded and bonded via the adhesive layer 73, and the double-sided readout type, and as shown in FIG. In the substrates 81 and 82 on which the signal bits are formed, a semi-transparent layer 81b is formed on the signal bit surface of one substrate 81, and a reflective layer 82a is formed on the signal bit surface of the other substrate 82. There is known a single-sided readout type in which substrates 81 and 82 are bonded and bonded via an adhesive layer 83 with 81b and a reflective layer 82a facing each other.

  Conventionally, a double-sided read DVD is manufactured by melting a polycarbonate resin by using a stamper in which the irregularities of the signal pits are irregular on the opposite sides of the male and female, and by injection molding to produce a transparent resin substrate having irregularities on the surface. A reflective layer is formed by depositing a metal such as aluminum on the uneven surface by sputtering or the like, and two transparent resin substrates on which the reflective layer is formed are bonded with an adhesive with the reflective layers facing each other. It was broken.

  On February 10, 2002, a unified standard “Blu-ray Disc” for the next generation optical disc was proposed. The main specifications are recording capacity: 23.3 / 25/27 GB, laser wavelength: 405 nm (blue-violet laser), lens numerical aperture (N / A): 0.85, disc diameter: 120 mm, disc thickness: 1.2 mm Track pitch: 0.32 μm or the like.

  As described above, the blu-ray disc has a narrow groove and a small pit. For this reason, it is necessary to narrow down the spot of the reading laser. However, if the spot is made smaller, it will be greatly affected by the tilt of the disc, and even if the DVD to be reproduced is slightly bent, it cannot be reproduced. In order to compensate for this disadvantage, it is considered to reduce the thickness of the substrate and to make the thickness of the cover layer on the pit on the laser irradiation side about 0.1 mm.

  Non-Patent Document 1, page 68 describes a DVD manufacturing method that meets the above requirements. This will be described with reference to FIG. A polycarbonate stamper having a reflective layer (or recording layer) 96a on a concave / convex surface provided with a UV curable resin 95A on the reflective layer of a disk substrate (1.1mm) 94a and having a reflective layer (or recording layer) on the concave / convex surface. An ultraviolet curable resin 95B is provided on 94b by coating. Next, the substrate is turned upside down, the substrate and the stamper are attached, and ultraviolet rays are irradiated from the stamper side to cure the ultraviolet curable resins 95A and 95B. The stamper 94b is removed from the layer of the ultraviolet curable resin 95B, a reflective layer (or recording layer) 96b is formed on the uneven surface, and a cover layer (thickness of about 0.1 mm) 97 is formed thereon.

  In the above method, an ultraviolet curable resin is provided on the surfaces of the disk substrate and the stamper by coating, and then the substrate is turned upside down and attached to the stamper. In this way, it is necessary to perform a complicated process of application and inversion, and when pasting the substrate and the stamper by inversion, there are disadvantages such as the generation of bubbles when contacting the viscous UV curable resins, There is a problem that good pasting cannot be performed. Further, the ultraviolet curable resin has a large shrinkage at the time of curing, and there is a problem that deformation such as warpage of the obtained medium is conspicuous.

  A method of manufacturing an optical information recording medium such as a DVD that can improve the above problems is disclosed in WO03 / 032305A1. Here, a production method using a photocurable transfer sheet made of a photocurable composition containing a reactive polymer having a photopolymerizable functional group and deformable by pressurization is described. That is, instead of the ultraviolet curable resin, the above-mentioned problem can be avoided by transferring the uneven surface by pressing the solid photocurable transfer sheet against the stamper.

WO03 / 032305A1 NIKKEI ELECTRONICS, No. 2001.1.5

  The inventors have intensively studied the use of photocurable transfer materials for the production of optical information recording media, and in particular, on the surface of a long release sheet, a disc-like photocurable transfer layer and a disc-like release sheet are provided. We have reached the mode of photo-curable transfer disk sheets that are laminated in order, and have been developing them. A typical example of the basic structure of such a photocurable transfer disk sheet is shown in FIG. In FIG. 6, a laminate 65 of a disc-like photocurable transfer layer 62d and a disc-like release sheet 63d is laminated on the surface of a long release sheet 61 to form a photocurable transfer disc sheet 60. . An inner hole 66 is provided through the laminate 65 and the long release sheet 61. Since the disc-like photocurable transfer layer 62d is a disc having a donut-shaped hole, the upper and lower release sheets can be peeled off to be advantageously used for manufacturing an optical information recording medium such as a DVD. It has become. Such a photocurable transfer disk sheet is manufactured by performing a disk-shaped punching process from a photocurable transfer material sheet in which a photocurable transfer layer and a release sheet are sequentially laminated on the surface of a long release sheet. can do.

  However, in this photo-curable transfer disk sheet, the disk-like photo-curable transfer layer is a material that can transfer the uneven surface of the substrate or stamper by pressing even at room temperature, so the photo-curable transfer disk sheet When the roll is rolled into a roll-shaped sheet roll and stored in the roll state, the shape of the wound sheet changes depending on the load, or the roll is tightened, so that the disk-shaped photocuring It has been found that problems such as disk shape change, layer thickness fluctuation, and oozing of layer components occur in the conductive transfer layer. Variations in the shape and layer thickness of the disc-shaped photocurable transfer layer cause a problem of reduction in accuracy and yield of an optical information recording medium manufactured using the disc-shaped photocurable transfer layer. In addition, the exudation of the layer component may contaminate the manufacturing apparatus, workers, etc., which causes a problem that workability is lowered.

  Accordingly, an object of the present invention is a photocurable transfer disc sheet that is advantageous for the production of a thin optical information recording medium having a small thickness, such as a DVD, and even in the state of a sheet roll of a long sheet, It is an object of the present invention to provide a photocurable transfer disk sheet which does not cause a change in the disk shape of the disk-like photocurable transfer layer, does not cause a change in layer thickness, and does not cause a layer component to ooze out.

  Further, the present invention provides the above light that does not change the disk shape of the disk-like photocurable transfer layer even in the state of a sheet roll of a long sheet, does not cause layer thickness fluctuations, and does not cause oozing of layer components. The object is to provide a method for producing a curable transfer disk sheet.

  Moreover, the objective of this invention is also providing the sheet | seat winding suitable for manufacture, storage, and conveyance of the said photocurable transfer disc sheet | seat.

The present inventors have stated that the above object is a laminate of a disc-like photocurable transfer layer and a disc-like release sheet provided thereon in a region other than the vicinity of both ends in the width direction of the surface of the long release sheet. Is a photocurable transfer disk sheet provided in the longitudinal direction,
It has been found that this is achieved by a photocurable transfer disc sheet characterized in that a spacer layer is provided in a region in the vicinity of both ends in the width direction on the surface of the long release sheet.

  The spacer layer may be provided on the surface on the side where the laminate is provided. Alternatively, the spacer layer may be provided on the surface on the side where the laminate is not provided.

  In the present invention, by providing such a spacer layer, the laminate is protected, and the photocurable transfer disc sheet of the present invention is rolled up and manufactured into a roll-shaped sheet roll, and in the state of the sheet roll. Even when stored, changes in the disk shape of the disk-like photocurable transfer layer, fluctuations in layer thickness, and oozing of layer components are greatly reduced.

  The spacer layer is preferably provided in a strip shape along the longitudinal direction of the long release sheet. By providing in this way, the disk-shaped photocurable transfer layer can be more uniformly protected.

  The width of the spacer layer is preferably in the range of 2 to 100 mm. Moreover, it is preferable that the thickness of the said spacer layer is large only by the thickness which exists in the range of 0-100 micrometers from the thickness of the said laminated body. The spacer layer preferably has a thickness in the range of 30 to 250 μm. By providing such a spacer layer, the disc-like photocurable transfer layer can be suitably protected.

  The spacer layer is preferably provided by a resin, and particularly preferably provided by sticking an adhesive tape to the surface of the long release sheet. Thereby, a suitable spacer layer can be easily provided.

  When an adhesive tape is used for the spacer layer, the adhesive strength of the adhesive tape is preferably in the range of 0.1 to 10 N / cm. By setting it as the range of such adhesive force, a spacer layer can be provided easily, a shape is hold | maintained without a distortion also in the state of a sheet winding, and it can peel without difficulty depending on the desire of the subsequent operation | work.

  The pressure-sensitive adhesive tape preferably includes a base material and an adhesive layer provided on the base material, and the base material is made of a flexible resin film. Moreover, it is preferable that the said adhesive tape contains the adhesive layer provided on the base material and this base material, and this adhesive layer contains a rubber-type adhesive. Such an adhesive tape can be suitably used.

  Further, the present invention is a sheet winding product in which the photocurable transfer disk sheet is wound around a cylindrical portion of a roll (roll with flange) including a cylindrical portion and flanges provided on both side surfaces thereof, There are also sheet rolls that are supported by. Furthermore, the present invention also resides in a sheet roll in which the flange has light shielding properties. Such a sheet roll has the above-mentioned photo-curable transfer disk sheet having excellent characteristics, minimizes winding deviation, and deviation due to the passage of time after winding, and further provides light-curing properties due to light shielding properties. It is a form suitable for protecting, manufacturing, storing and transporting materials. In addition, the width of the protective spacer can be further reduced by using a flange.

Moreover, this invention exists also in the following manufacturing methods. That is, the above-mentioned photocurable transfer disk sheet has the following steps:
A) A step of laminating a photocurable transfer layer and a long release sheet in order on the surface of the long release sheet under conveyance to form a photocurable transfer material sheet,
B) The photocurable transfer material sheet is subjected to a disk-like punching process from the side of one long release sheet, and a disk-like shape is formed in a region other than the vicinity of both ends in the width direction on the surface of the other long release sheet. Leaving the laminate of the photocurable transfer layer and the disc-like release sheet in the longitudinal direction;
C) A step of providing a spacer layer in the form of a band along the longitudinal direction in a region in the vicinity of both ends in the width direction on the surface of the long release sheet,
It can be suitably manufactured by a method for manufacturing a photocurable transfer disk sheet characterized by comprising By this method, the spacer layer can be provided after punching.

  The step C) may be performed by providing a spacer layer on the surface on the side where the laminate is provided. Or you may perform the said process C) by providing a spacer layer on the surface of the side in which the said laminated body is not provided.

Said step B) comprises the following steps:
B1) As a disc-like punching process, punching an outer circle that punches two layers of one long release sheet and a photocurable transfer layer in a region other than the vicinity of both ends in the width direction of the surface of the long release sheet; A process of punching an inner circle for punching three layers of one long release sheet, a photocurable transfer layer and the other long release sheet, by arranging the outer circle and the inner circle concentrically,
B2) peeling the two layers around the punched outer circle and leaving a laminate of the disc-like photocurable transfer layer and the disc-like release sheet in the longitudinal direction on the other long release sheet;
It is preferable to contain. By punching such an outer circle and an inner circle, a disk-shaped laminate having a donut-shaped hole can be efficiently manufactured.

Moreover, this invention exists also in the following manufacturing methods. That is, the above-mentioned photocurable transfer disk sheet has the following steps:
A) A step of laminating a photocurable transfer layer and a long release sheet in order on the surface of the long release sheet under conveyance to form a photocurable transfer material sheet,
D) a step of providing a spacer layer in the vicinity of both ends in the width direction of the surface of one long release sheet;
E) The photocurable transfer material sheet is subjected to disc-like punching from the side of the long release sheet not provided with the spacer layer, and the spacer layer of the long release sheet provided with the spacer layer is provided. A step of leaving a laminate of the disc-shaped photocurable transfer layer and the disc-shaped release sheet in the longitudinal direction in a region other than the vicinity of both ends in the width direction of the surface on the non-side,
It can be suitably manufactured by a method for manufacturing a photocurable transfer disk sheet characterized by comprising By this method, the spacer layer can be provided before punching.

Said step E) comprises the following steps:
E1) As a disc-like punching process, in a region other than the vicinity of both ends in the width direction of the surface of the long release sheet,
Punching out an outer circle that punches out two layers of a long release sheet and a photocurable transfer layer not provided with a spacer layer; and
Punching an inner circle that punches out three layers of a long release sheet that is not provided with a spacer layer, a photocurable transfer layer, and a long release sheet that is provided with a spacer layer,
A process in which an outer circle and an inner circle are arranged concentrically,
E2) peeling the two layers around the punched outer circle and leaving a laminate of the disc-like photocurable transfer layer and the disc-like release sheet in the longitudinal direction in the region of the surface of the long release sheet;
It is preferable to contain. By punching such an outer circle and an inner circle, a disk-shaped laminate having a donut-shaped hole can be efficiently manufactured.

  In the step C) or the step D), the spacer layer is preferably provided by sticking an adhesive tape to the surface of the long release sheet. Thereby, a spacer layer can be provided easily.

After the step C) or the step E), the following step:
F) A step of continuously winding the photocurable transfer disk sheet around a cylindrical portion of a roll comprising a cylindrical portion and flanges provided on both side surfaces thereof,
Is preferably provided. By performing winding using a roll comprising a cylindrical portion and flanges provided on both sides of the cylindrical portion, it is possible to minimize deviation of winding of the sheet winding and deviation due to passage of time of the wound sheet winding. it can.

  It is preferable that the flange has a light shielding property.

  Furthermore, this invention exists also in the photocurable transfer disk sheet manufactured by the above-mentioned manufacturing method.

  The photocurable transfer disc sheet of the present invention is a photocurable transfer sheet that is advantageous for the production of a high capacity optical information recording medium, such as a DVD, and is wound around the photocurable transfer disc sheet. Even in the case of producing a roll-shaped sheet roll and when storing in the state of the sheet roll, the shape of the wound sheet is not changed by the load, and the sheet roll is not wound. That is, there is no change in the disk shape of the disk-like photocurable transfer layer, no change in layer thickness occurs, and no oozing of layer components occurs. Therefore, it has high workability without causing contamination of the manufacturing apparatus, workers, etc. due to oozing out of the layer components. Moreover, since the laminated body including the disk-like photocurable transfer layer is protected and there is no fear of variation in shape and layer thickness, handling during work is easy. Furthermore, since the shape and layer thickness of the disk-like photocurable transfer layer are not impaired by its own weight, the diameter of the sheet roll can be increased. That is, it is possible to further increase productivity by using a sheet roll having a large diameter. The optical information recording medium manufactured using the photocurable transfer disk sheet of the present invention can be manufactured with high productivity and workability, and have high accuracy and yield.

  Moreover, if the manufacturing method of this invention is used, the above-mentioned photocurable transfer disk sheet can be manufactured suitably. The manufacturing method of the present invention has high accuracy and productivity.

  Furthermore, the sheet roll of the photocurable transfer disk sheet of the present invention is suitable for production, storage and transportation while having the above-mentioned preferable characteristics.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an explanatory view illustrating an example of the structure of the photocurable transfer disk sheet of the present invention. 1-1 is a perspective view, and FIG. 1-2 is a cross-sectional view of the sheet of FIG. 1-1 cut along a cross-section including A-A ′. On the surface of the long release sheet 11, a laminate 15 of a disc-like photocurable transfer layer 12d and a disc-like release sheet 13d is laminated to form a photocurable transfer disc sheet 10. An inner hole 16 is provided through the laminate 15 and the long release sheet 11. On the surface of the long release sheet 11, a laminate is provided in a central portion in the width direction, that is, in a region other than the vicinity of both ends in the width direction of the surface of the long release sheet, and this laminate is provided in the longitudinal direction. ing. On both sides of the laminate, that is, in the vicinity of both ends in the width direction of the surface of the long release sheet, on the region where the surface of the long release sheet is exposed without providing the laminate, the spacer layer 17 Is provided. In FIG. 1, the spacer layer 17 is provided on the long release sheet 11 on the same surface as the laminate 15. By setting this spacer layer, the photocurable transfer disk sheet of the present invention can be rolled up to produce a roll-shaped sheet roll, and when it is stored in the form of the sheet roll, the shape of the wound sheet. Is not changed by the load, and the sheet roll is not tightened.

  FIG. 2 is an explanatory view illustrating another example of the structure of the photocurable transfer disk sheet of the present invention. 2A is a perspective view, and FIG. 2B is a cross-sectional view of the sheet of FIG. 2A cut along a cross section including B-B ′. As in FIG. 1, a laminate 25 of a disc-like photocurable transfer layer 22 d and a disc-like release sheet 23 d is laminated on the surface of the long release sheet 21 to form a photocurable transfer disc sheet 20. ing. An inner hole 26 is provided through the laminate 25 and the long release sheet 21. A spacer layer 27 is provided on a region in the vicinity of both ends in the width direction of the surface of the long release sheet, and on the region where the surface of the long release sheet is exposed without providing a laminate, Unlike the configuration of FIG. 1, in the configuration of FIG. 2, the spacer layer 27 is provided on the long release sheet 21 on the surface on the side (opposite side) different from the laminate 25. The spacer layer provided in such a form is also wound when the photo-curable transfer disk sheet of the present invention is wound up to produce a roll-shaped sheet roll, and when it is stored in the form of the sheet roll. It is possible to prevent the shape of the taken sheet from changing due to the load, and to prevent the sheet roll from being tightened.

  The flow of manufacturing the photocurable transfer disk sheet of the present invention described above will be described next.

  FIG. 3 is an explanatory view illustrating an example of the flow of manufacturing the photocurable transfer disk sheet of the present invention having the structure shown in FIGS. 1 and 2. First, by a process (not shown), the long release sheet 31, the photocurable transfer layer 32, and the long release sheet 33 are laminated to form a photocurable transfer material sheet (FIG. 3-1). Next, a sheet (FIG. 3-2) in which the inner circle 38 and the outer circle 39 are punched concentrically by punching is produced (step B1). The center of this concentric circle is placed at the center in the width direction of the surface of the long release sheet. The outer circle 39 passes through the two layers of the photocurable transfer layer 32 and the long release sheet 33, and the inner circle 38 is 3 of the long release sheet 31, the photocurable transfer layer 32, and the long release sheet 33. Penetrates the layer. The three-layered cylinder that is inside the inner circle is removed as a residue portion, and the peripheral portion of the outer circle is also removed as a residue portion (step B2). Thereby, the laminated body 35 which has the inner hole 36 and consists of the disk-shaped photocuring layer 32d and the disk-shaped peeling sheet 33d is formed on the elongate peeling sheet 31 (FIG. 3-3). With respect to such a photocurable transfer disc sheet (FIG. 3-3), a spacer layer 37 is formed in a band shape along the longitudinal direction of the sheet in the vicinity of both ends in the width direction of the surface of the long release sheet 31. Provide (step C). The spacer layer 37 is provided on the same surface as the laminated body 35 to have the structure shown in FIG. 1 (FIG. 3-4a), or provided on the surface on the side where the laminated body 35 is not provided. (FIG. 3-4b) is possible.

  FIG. 4 is an explanatory view illustrating another example of the flow of manufacturing the photocurable transfer disk sheet of the present invention having the structure shown in FIG. First, by a process (not shown), the long release sheet 41, the photocurable transfer layer 42, and the long release sheet 43 are laminated to form a photocurable transfer material sheet (FIG. 4A). Next, a spacer layer 47 is provided in a band shape along the longitudinal direction of the sheet in a region in the vicinity of both ends in the width direction on the surface of the long release sheet 41 (step D). A transfer material sheet is formed (FIG. 4-2). Next, a sheet (FIG. 4-3) in which the inner circle 48 and the outer circle 49 are punched concentrically by punching is produced (step E1). The center of this concentric circle is placed at the center in the width direction of the surface of the long release sheet. The outer circle 49 passes through two layers of the photocurable transfer layer 42 and the long release sheet 43, and the inner circle 48 is 3 of the long release sheet 41, the photocurable transfer layer 42, and the long release sheet 43. Penetrates the layer. The three-layered cylinder that is inside the inner circle is removed as a residue portion, and the peripheral portion of the outer circle is also removed as a residue portion (step E2). Thereby, the laminated body 45 which has the inner hole 46 and consists of the disk-shaped photocuring layer 42d and the disk-shaped peeling sheet 43d is formed on the elongate peeling sheet 41 (FIG. 4-4). That is, the photocurable transfer disk sheet of the present invention having the structure shown in FIG. 2 is obtained.

  The above-described manufacturing flow can be continuously performed under conveyance using a long sheet. And the photocurable transfer disk sheet can be provided with a step of winding it on a roll-shaped sheet roll following the manufacturing flow shown in FIG. FIG. 5 is an explanatory diagram illustrating a process of continuously winding the photocurable transfer disk sheet around a cylindrical portion of a roll including a cylindrical portion and flanges provided on both side surfaces thereof. FIG. 5A shows a perspective view of a sheet roll wound around the cylindrical portion of the roll, and FIG. 5-2 shows a cross-section of the plane including the axis of the wound sheet roll. Some are shown. Long release sheets 51 each including a laminate 55 of a disk-shaped photocured layer 52d and a disk-shaped release sheet 53d are stacked in order in the sheet roll. And the spacer layer 57 located in the both ends of the width direction of the elongate peeling sheet 51 is supporting the accumulated long peeling sheets. Thereby, the laminated body 55 of the disk-shaped photocuring layer 52d and the disk-shaped release sheet 53d is protected from a direct load by the upper and lower long release sheets. Further, the photocurable transfer disk sheet to be wound is guided by the flange and wound around the cylindrical portion of the roll without causing any axial displacement. In addition, since the displacement in the axial direction is suppressed by the flange thereafter, the laminated body is also protected from the displacement in the lateral direction. That is, it is possible to minimize winding deviation and deviation due to the passage of time after winding. Further, by using the support by the flange, the same effect can be obtained even if the width of the protective spacer is made smaller. As a result, the area of the protective spacer portion that does not directly become a product can be reduced, and cost effectiveness can be increased. Furthermore, the flange provides an impact buffering effect during transportation.

  The flange described above preferably has a light shielding property. As a result, the photocurable material can be manufactured, stored and transported while being reliably protected from external light. As such a material, any material that can shield light while maintaining the mechanical strength necessary for the flange can be used. Furthermore, it is preferably a material that is hardly sticky to the photocurable transfer disk sheet and the protective spacer. The light shielding property can be imparted, for example, by coloring the material. Preferable materials include resins such as polyethylene, ABS, and vinyl chloride that are colored black. Materials coated with these materials can also be preferably used.

  As described above, the spacer layer is generally preferably provided in a continuous belt shape along the longitudinal direction of the long release sheet. However, it can also be provided intermittently in synchronism with the period of installation of the laminate.

  The width of the spacer layer is generally in the range of 2 to 100 mm, preferably in the range of 10 to 70 mm, and particularly preferably in the range of 20 to 50 mm. The wider the spacer layer is within the range allowed by the width of the long sheet used, the greater the effect of protecting the laminate with the wound sheet roll. Use of a sheet is not preferable because it leads to an increase in production costs.

  The distance between the spacer layer and the laminate is generally in the range of 2 to 40 mm, preferably in the range of 4 to 30 mm, and particularly preferably in the range of 6 to 20 mm. The smaller the interval, the greater the effect of protecting the laminate with the wound sheet roll, but when the component has exuded from the laminate that received unexpectedly strong stress, the component is removed from the sheet roll. In order to prevent leakage, it is preferable that the interval is larger in the above range.

  The thickness of the spacer layer is generally in the range of 30 to 250 μm, preferably in the range of 40 to 200 μm. The preferable range of the thickness of the spacer layer is determined by the thickness of the laminate to be protected, and it is preferably larger by a thickness in the range of 0 to 100 μm, particularly 30 to 60 μm from the thickness of the laminate. Even if the thickness of the spacer layer is smaller than the thickness of the laminate, it is effective for protection, and it is particularly effective for protection that it is the same or slightly larger, but if it is excessively large, the overall shape of the wound sheet wound is the diameter. The bigger it becomes, the more it collapses, which is not preferable.

  The spacer layer can be used as long as the material satisfies the above-described configuration and can be manufactured, but is preferably provided with a resin. Furthermore, the spacer layer can be provided by adhering a sheet-like material, or can be provided by applying a resin composition. Since it can be easily installed without contaminating the laminate, a spacer layer can be provided by adhering or sticking a so-called adhesive tape or adhesive tape on the surface of the long release sheet. The use of an adhesive tape is particularly preferred from the viewpoint of the subsequent workability of the wound sheet roll.

  The pressure-sensitive adhesive tape used for installing the spacer layer has an adhesive strength of 180 ° peel, 0.1 to 10 N / cm, preferably 0.2 to 8 N / cm, particularly 0.5. It is preferably in the range of -5 N / cm. The greater the adhesive strength, the more effective the sheet roll is stabilized and the less the winding misalignment occurs. On the other hand, the lower the adhesive strength, the weaker the unwinding strength of the adhesive tape, the easier to obtain a stable long winding, and the easy separation of the spacer layer as desired in the next step.

  The adhesive tape used for installing the spacer layer may be any adhesive tape that can be adhered and used as the above-described spacer layer, and includes a base material and an adhesive layer provided on the base material. An adhesive tape made of a flexible resin film is preferable.

  Examples of the flexible resin that can be used for such a substrate include polyester, nylon, polyolefin, polyethylene, polyimide, PTFE, vinyl chloride, PVA, and polypropylene. In particular, vinyl chloride and polyester are preferable from the viewpoint of flexibility.

  As a material of the adhesive layer contained in the adhesive tape, it can be used for the above-mentioned spacer layer, and any material can be used as long as it is preferably in the above-mentioned adhesive force range. Examples of the material for the adhesive layer include rubber adhesives, acrylic adhesives, and silicone adhesives. A rubber adhesive or an acrylic adhesive is preferable, and a rubber adhesive is particularly preferable from the viewpoint of cost.

  Commercially available adhesive tapes can be used, for example, 4627 made by tesa tape, EC-6220 made by EC series (made by Sumilon Co., Ltd.), SPV made by E-MASK (made by Nitto Denko Corporation). -214, No. of surface protection tape (manufactured by Sumitomo 3M Limited). 330 etc. can be mentioned. No. of surface protection tape 330 and SPV-214 are particularly preferred.

  The material of the disk-shaped photocurable transfer layer, that is, the material of the photocurable transfer layer, can be accurately transferred by pressing the uneven surface of the stamper in the production of the optical information recording medium, and is irradiated with light (visible light). Any material can be used as long as it can be a layer that can be cured by light irradiation and radiation irradiation including ultraviolet irradiation). Furthermore, any material can be suitably used as long as it is a layer that can be easily deformed by pressurization and can form a layer in which the reactive polymer is slightly cross-linked to prevent the transfer layer from seeping out and the layer thickness variation is suppressed.

  The cured disc-shaped photocurable transfer layer material should have a light transmittance of 70% or more in the wavelength range of 380 to 420 nm so that it can be easily read by a reproduction laser in order to increase the density of information. Is preferred. In particular, the light transmittance in the wavelength region of 380 to 420 nm is preferably 80% or more. Therefore, the optical information recording medium of the present invention produced using this transfer sheet can be advantageously used in a method of reproducing a pit signal using a laser having a wavelength of 380 to 420 nm.

  Examples of such a material include a photocurable composition. Such a photocurable composition generally includes a polymerizable compound (monomer and / or oligomer) having a photopolymerizable functional group, photopolymerization. Used including initiators, additives and the like. As the photopolymerizable functional group, a polymerizable compound having an ethylenic double bond (preferably an acryloyl group or a methacryloyl group) is preferable.

  Examples of the polymerizable monomer having a photopolymerizable functional group include alkyl acrylate (eg, methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate) and / or alkyl methacrylate (eg, methyl methacrylate, ethyl methacrylate, butyl methacrylate). , 2-ethylhexyl methacrylate).

  The polymerizable monomer generally contains 1 to 50 mol%, particularly 5 to 30 mol% of a photopolymerizable functional group. As this photopolymerizable functional group, an acryloyl group, a methacryloyl group, and a vinyl group are preferable, and an acryloyl group and a methacryloyl group are particularly preferable.

  It is preferable that the above-mentioned photocurable composition further contains a reactive diluent having a photopolymerizable functional group. Examples of reactive diluents include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 2-ethylhexyl polyethoxy (meth) acrylate, and benzyl (meth). Acrylate, isobornyl (meth) acrylate, phenyloxyethyl (meth) acrylate, tricyclodecane mono (meth) acrylate, dicyclopentenyloxyethyl (meth) acrylate, tetrahydrofurfuryl (meth) acrylate, acryloylmorpholine, N-vinylcaprolactam 2-hydroxy-3-phenyloxypropyl (meth) acrylate, o-phenylphenyloxyethyl (meth) acrylate, neopentyl glycol di (meth) acrylate Neopentyl glycol dipropoxy di (meth) acrylate, hydroxypivalic acid neopentyl glycol di (meth) acrylate, tricyclodecane dimethylol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, nonanediol di ( (Meth) acrylate, trimethylolpropane tri (meth) acrylate, pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate, tris [(meth) acryloxyethyl] isocyanurate, ditrimethylolpropane tetra (meth) acrylate, etc. (Meth) acrylate monomers, polyol compounds (for example, ethylene glycol, propylene glycol, neopentyl glycol, 1,6-hexanediol, 3 Methyl-1,5-pentanediol, 1,9-nonanediol, 2-ethyl-2-butyl-1,3-propanediol, trimethylolpropane, diethylene glycol, dipropylene glycol, polypropylene glycol, 1,4-dimethylol Polyols such as cyclohexane, bisphenol A polyethoxydiol, polytetramethylene glycol, and the like and polybasics such as succinic acid, maleic acid, itaconic acid, adipic acid, hydrogenated dimer acid, phthalic acid, isophthalic acid, terephthalic acid Polyester polyols that are reaction products of acids or acid anhydrides thereof, polycaprolactone polyols that are reaction products of the polyols and ε-caprolactone, polybasic acids or acid anhydrides of the polyols. Ε-Capro of things A reaction product with kuton, polycarbonate polyol, polymer polyol, etc.) and an organic polyisocyanate (for example, tolylene diisocyanate, isophorone diisocyanate, xylylene diisocyanate, diphenylmethane-4,4′-diisocyanate, dicyclopentanyl diisocyanate, hexamethylene diisocyanate, 2,4,4′-trimethylhexamethylene diisocyanate, 2,2 ′, 4-trimethylhexamethylene diisocyanate, etc.) and a hydroxyl group-containing (meth) acrylate (for example, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meta) ) Acrylate, 4-hydroxybutyl (meth) acrylate, 2-hydroxy-3-phenyloxypropyl (meth) acrylate, cyclohexane-1,4- Bisphenol type such as polyurethane (meth) acrylate, bisphenol A type epoxy resin, bisphenol F type epoxy resin, etc., which is a reaction product of dimethylol mono (meth) acrylate, pentaerythritol tri (meth) acrylate, glycerin di (meth) acrylate, etc. Examples include (meth) acrylate oligomers such as bisphenol-type epoxy (meth) acrylate, which is a reaction product of an epoxy resin and (meth) acrylic acid. These compounds having a photopolymerizable functional group can be used alone or in combination of two or more.

  As the photopolymerization initiator, any known photopolymerization initiator can be used, but one having good storage stability after blending is desirable. Examples of such photopolymerization initiators include benzoin series such as acetophenone series and benzyldimethyl ketal, thiophenone series such as benzophenone series, isopropylthioxanthone, and 2-4-diethylthioxanthone, and other special types include methylphenylglycol. Oxylate can be used. Particularly preferably, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- (4- (methylthio) phenyl) -2-morpholinopropane-1, Examples include benzophenone. These photopolymerization initiators may contain one or two or more kinds of known and commonly used photopolymerization accelerators such as benzoic acid-based or tertiary amine-based compounds such as 4-dimethylaminobenzoic acid as required. Can be mixed and used. Moreover, it can be used by 1 type, or 2 or more types of mixture of only a photoinitiator. In general, the photocurable composition preferably contains a photopolymerization initiator in an amount of 0.1 to 20% by mass, particularly 1 to 10% by mass.

  Among the photopolymerization initiators, examples of the acetophenone-based polymerization initiator include 4-phenoxydichloroacetophenone, 4-t-butyl-dichloroacetophenone, 4-t-butyl-trichloroacetophenone, diethoxyacetophenone, and 2-hydroxy-2. -Methyl-1-phenylpropan-1-one, 1- (4-isopropylphenyl) -2-hydroxy-2-methylpropan-1-one, 1- (4-dodecylphenyl) -2-hydroxy-2-methyl Propan-1-one, 4- (2-hydroxyethoxy) -phenyl (2-hydroxy-2-propyl) ketone, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- (4- (methylthio) phenyl) -2 As benzophenone polymerization initiators such as morpholinopropane-1, Benzophenone, benzoyl benzoate, methyl benzoyl benzoate, 4-phenyl benzophenone, hydroxybenzophenone, 4-Benzzoiru 4'-methyl diphenyl sulfide, etc. 3,3'-dimethyl-4-methoxybenzophenone may be used.

  As the acetophenone-based polymerization initiator, in particular, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- (4- (methylthio) phenyl) -2 -Morpholinopropane-1 is preferred. As the benzophenone polymerization initiator, benzophenone, benzoylbenzoic acid, and methyl benzoylbenzoate are preferable. Tertiary amine photopolymerization accelerators include triethanolamine, methyldiethanolamine, triisopropanolamine, 4,4'-dimethylaminobenzophenone, 4,4'-diethylaminobenzophenone, ethyl 2-dimethylaminobenzoate. , Ethyl 4-dimethylaminobenzoate, ethyl 4-dimethylaminobenzoate (n-butoxy), isoamyl 4-dimethylaminobenzoate, 2-ethylhexyl 4-dimethylaminobenzoate and the like can be used. Particularly preferably, as the photopolymerization accelerator, ethyl 4-dimethylaminobenzoate, ethyl 4-dimethylaminobenzoate (n-butoxy), isoamyl 4-dimethylaminobenzoate, 2-ethylhexyl 4-dimethylaminobenzoate, etc. Is mentioned.

  In general, the mass ratio of the photopolymerizable compound to the photopolymerization initiator is preferably in the range of 40 to 100: 0.1 to 10, particularly 60 to 100: 1 to 10.

  The photocurable transfer layer is preferably designed so that the glass transition temperature is 20 ° C. or lower and the transmittance is 70% or higher. By setting the glass transition temperature to 20 ° C. or lower, when the resulting photocurable transfer layer is pressure-bonded to the uneven surface of the stamper, it can have flexibility that can closely follow the uneven surface even at room temperature. In particular, the glass transition temperature is in the range of 15 ° C. to −50 ° C., particularly 15 ° C. to −10 ° C., so that the followability is excellent. If the glass transition temperature is too high, a high pressure and a high pressure are required at the time of bonding, leading to a decrease in workability. If it is too low, sufficient hardness after curing cannot be obtained. For this purpose, in addition to the compound having a photopolymerizable functional group and a photopolymerization initiator, it is preferable to add a thermoplastic resin and other additives described below as desired.

  As another additive, a silane coupling agent (adhesion promoter) can be added. As this silane coupling agent, vinyltriethoxysilane, vinyltris (β-methoxyethoxy) silane, γ-methacryloxypropyltrimethoxysilane, vinyltriacetoxysilane, γ-glycidoxypropyltrimethoxysilane, γ-glycidoxy Propyltriethoxysilane, β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane, γ-chloropropylmethoxysilane, vinyltrichlorosilane, γ-mercaptopropyltrimethoxysilane, γ-aminopropyltriethoxysilane, N-β There are (aminoethyl) -γ-aminopropyltrimethoxysilane and the like, and one of these can be used alone or two or more of them can be used in combination. The addition amount of these silane coupling agents is usually 0.01 to 5 parts by mass with respect to 100 parts by mass of the reactive polymer.

  Similarly, an epoxy group-containing compound can be added for the purpose of improving adhesiveness. Examples of the epoxy group-containing compound include triglycidyl tris (2-hydroxyethyl) isocyanurate; neopentyl glycol diglycidyl ether; 1,6-hexanediol diglycidyl ether; acrylic glycidyl ether; 2-ethylhexyl glycidyl ether; Examples thereof include phenol glycidyl ether; pt-butylphenyl glycidyl ether; adipic acid diglycidyl ester; o-phthalic acid diglycidyl ester; glycidyl methacrylate; Further, the same effect can be obtained by adding an oligomer containing an epoxy group having a molecular weight of several hundred to several thousand or a polymer having a weight average molecular weight of several thousand to several hundred thousand. The addition amount of these epoxy group-containing compounds is sufficient to be 0.1-20 parts by mass with respect to 100 parts by mass of the reactive polymer, and at least one of the epoxy group-containing compounds can be added alone or in combination. .

  As another additive, a hydrocarbon resin can be added for the purpose of improving workability such as workability and bonding. In this case, the added hydrocarbon resin may be either a natural resin type or a synthetic resin type. In natural resin systems, rosin, rosin derivatives, and terpene resins are preferably used. For rosin, gum-based resins, tall oil-based resins, and wood-based resins can be used. As the rosin derivative, rosin obtained by hydrogenation, heterogeneity, polymerization, esterification, or metal chloride can be used. As the terpene resin, a terpene phenol resin can be used in addition to a terpene resin such as α-pinene and β-pinene. In addition, dammar, corbal and shellac may be used as other natural resins. On the other hand, in the synthetic resin system, petroleum resin, phenol resin, and xylene resin are preferably used. As the petroleum resin, aliphatic petroleum resin, aromatic petroleum resin, alicyclic petroleum resin, copolymer petroleum resin, hydrogenated petroleum resin, pure monomer petroleum resin, and coumarone indene resin can be used. As the phenol resin, an alkyl phenol resin or a modified phenol resin can be used. As the xylene-based resin, a xylene resin or a modified xylene resin can be used.

  Acrylic resin can also be added. For example, a homopolymer or copolymer obtained from alkyl acrylate (eg, methyl acrylate, ethyl acrylate, butyl acrylate) and / or alkyl methacrylate (eg, methyl methacrylate, ethyl methacrylate, butyl methacrylate) can be mentioned. Moreover, the copolymer of these monomers and another copolymerizable monomer can also be mentioned. In particular, polymethyl methacrylate (PMMA) is preferable from the viewpoints of reactivity during photocuring, durability after curing, and transparency.

  Although the addition amount of polymers, such as the said hydrocarbon resin, is selected suitably, 1-20 mass parts is preferable with respect to 100 mass parts of said reactive polymers, More preferably, it is 5-15 mass parts.

  In addition to the above additives, the photocurable composition may contain a small amount of an ultraviolet absorber, an anti-aging agent, a dye, a processing aid and the like. Further, in some cases, a small amount of additives such as silica gel, calcium carbonate, silicon copolymer fine particles and the like may be contained.

  In one preferred embodiment, the photopolymerizable compound contained in the photocurable composition has a functional group having active hydrogen, and simultaneously reacts with the functional group having active hydrogen in the photocurable composition. It is preferable that the compound which has at least 2 group which has property is contained. When such a photocurable composition is used as a material, during the processing or storage of the sheet having the transfer layer, they react with each other to slightly crosslink and increase the viscosity of the transfer layer. Thereby, the seepage of the transfer layer and the variation in the layer thickness can be largely suppressed.

  Examples of the compound having a functional group having active hydrogen and a photopolymerizable functional group include alkyl acrylate (eg, methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate) and / or alkyl methacrylate (eg, methyl methacrylate, A homopolymer or copolymer (that is, acrylic resin) obtained from ethyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate), and a functional group having a photopolymerizable functional group and active hydrogen in the main chain or side chain Can be mentioned. Therefore, such a reactive compound (reactive polymer) includes, for example, one or more (meth) acrylates described above and a (meth) acrylate having a functional group such as a hydroxyl group (eg, 2-hydroxyethyl (meta) ) Acrylate) and the resulting polymer can be obtained by reacting with a functional group of the polymer and a compound having a photopolymerizable group, such as isocyanatoalkyl (meth) acrylate. . At that time, a reactive polymer having a hydroxyl group and a photopolymerizable functional group as a functional group having active hydrogen can be obtained by adjusting the amount of isocyanatoalkyl (meth) acrylate so that the hydroxyl group remains. .

  Alternatively, in the above, a photopolymerizable functional group having an amino group as a functional group having active hydrogen by using a (meth) acrylate having an amino group instead of a hydroxyl group (eg, 2-aminoethyl (meth) acrylate) A contained reactive polymer can be obtained. Similarly, a photopolymerizable functional group-containing reactive polymer having a carboxyl group or the like as a functional group having active hydrogen can also be obtained.

  In addition, as described above, a photopolymerizable group is formed through a urethane bond using isocyanatoalkyl (meth) acrylate or the like, but other methods such as forming an acrylic resin containing a carboxylic acid, A photopolymerizable group can also be formed by reacting an acid with a (meth) acrylate having an epoxy group (eg, glycidyl (meth) acrylate).

  An acrylic resin having the photopolymerizable functional group via a urethane bond is particularly preferable.

  Examples of the compound having at least two groups reactive with the functional group having active hydrogen include isocyanate compounds and epoxy compounds, but isocyanate compounds having high reactivity at normal temperature are easy to use and are preferable.

  Examples of at least difunctional isocyanate compounds include tolylene diisocyanate (TDI), isophorone diisocyanate, xylylene diisocyanate, diphenylmethane-4,4-diisocyanate, dicyclopentanyl diisocyanate, hexamethylene diisocyanate, 2,4,4′-trimethyl. Examples include hexamethylene diisocyanate and 2,2 ′, 4-trimethylhexamethylene diisocyanate. Trifunctional or higher functional isocyanate compounds such as a TDI adduct of trimethylolpropane can also be used. Of these, a hexamethylene diisocyanate adduct of trimethylolpropane is preferred.

  The compound having at least two groups having reactivity with the functional group having active hydrogen described above is contained in the photocurable composition in an amount of 0.2 to 4% by mass, particularly 0.2 to 2% by mass. It is preferable. Appropriate crosslinking is provided to prevent the transfer layer from seeping out, and good transferability of the unevenness of the substrate and stamper is also maintained. The reaction between the compound and the reactive polymer proceeds gradually after the transfer layer is formed, and reacts considerably at room temperature (generally 25 ° C.) at 24 hours. It is considered that the reaction proceeds after the coating solution for forming the transfer layer is prepared and before the coating solution is applied. After forming the transfer layer, it is preferable to cure to a certain extent before winding it on the sheet roll. Therefore, if necessary, the reaction is performed by heating during the formation of the transfer layer or after winding in the state of the sheet roll. May be promoted.

  The photocurable transfer layer is prepared by uniformly mixing the photocurable material composition as described above together with additives as necessary, kneading with an extruder, roll, etc., and then calendering, roll, T-die extrusion, inflation, etc. The film can be formed into a predetermined shape by the film forming method and laminated on the long release sheet. If desired, a support can be used. In this case, a film is formed on the support. In a preferred embodiment, a long release sheet is used as a support, and the film is laminated directly on the long release sheet. The film forming method of the photocurable adhesive of the present invention is particularly preferable in that each constituent component is uniformly mixed and dissolved in a good solvent, and this solution is applied to a separator precisely coated with silicone or fluororesin. In this method, coating is performed on a support (long release sheet) by a gravure roll method, a Myer bar method, a lip die coating method or the like, and a solvent is dried to form a film.

  The thickness of the photocurable transfer layer is generally in the range of 1 to 1200 μm, preferably in the range of 5 to 500 μm. In particular, the range of 5 to 300 μm (preferably 150 μm or less) is preferable. If it is thinner than 1 μm, the sealing performance is poor, and the unevenness of the transparent resin substrate may not be filled. On the other hand, if the thickness is larger than 1000 μm, the thickness of the recording medium increases, which may cause problems in the storage and assembly of the recording medium, and may also affect the light transmission. In order to make the optical information recording medium multi-layered, it is advantageous to make the thickness small within the above range.

  Such a disc-like photocurable transfer layer can be provided in the form of a film in which the film thickness accuracy is precisely controlled, so that it can be easily and accurately bonded to the substrate and the stamper. In addition, this bonding can be carried out at 20 to 100 ° C. by a simple method such as a pressure roll or a simple press, and then cured by light at room temperature for 1 to several tens of seconds. Since it is difficult for displacement and peeling to occur in the laminate, it has a feature that it can be handled freely until photocuring.

  When curing a disk-shaped photocurable transfer layer, many light sources that emit light in the ultraviolet to visible region can be used as the light source, for example, ultrahigh pressure, high pressure, low pressure mercury lamps, chemical lamps, xenon lamps, halogen lamps, mercury lamps. , Carbon arc lamp, incandescent lamp, laser beam and the like. The irradiation time cannot be determined unconditionally depending on the type of lamp and the intensity of the light source, but is about several seconds to several minutes. In order to accelerate curing, the disk-shaped photocurable transfer layer may be preheated to 30 to 80 ° C. and irradiated with ultraviolet rays.

  As the material of the long release sheet, a transparent organic resin having a glass transition temperature of 50 ° C. or higher is preferable. Examples of such a material include polyester resins such as polyethylene terephthalate, polycyclohexylene terephthalate, and polyethylene naphthalate, nylon 46 In addition to polyamide resins such as modified nylon 6T, nylon MXD6 and polyphthalamide, ketone resins such as polyphenylene sulfide and polythioether sulfone, sulfone resins such as polysulfone and polyether sulfone, polyether nitrile, poly Using a transparent resin substrate mainly composed of an organic resin such as arylate, polyetherimide, polyamideimide, polycarbonate, polymethyl methacrylate, triacetyl cellulose, polystyrene, polyvinyl chloride It is possible. Of these, polycarbonate, polymethyl methacrylate, polyvinyl chloride, polystyrene, and polyethylene terephthalate can be suitably used. The thickness is preferably 10 to 200 μm, particularly preferably 20 to 100 μm.

  The above-described punching process for the photocurable transfer material sheet is a punching process method in which the inner circle and the outer circle are punched concentrically at a predetermined depth to remove the residue and form a desired perforated disk shape. Can be used if present. Punching that can be performed under conveyance on a long sheet is preferable. Although it is possible to use a so-called Victoria blade or Thomson blade, it is possible to perform punching sequentially, but it is preferable to perform punching continuously under conveyance by rotary die cutting.

  If the photocurable transfer disk sheet of the present invention is used, an optical information recording medium as exemplified in FIG. 6 can be produced with high accuracy and high productivity.

  The following examples illustrate the invention in more detail.

[Example 1]
<Preparation of photocurable transfer sheet>
(Production of polymer 1)
Polymer blend 1
Methyl methacrylate 74 parts by mass n-butyl methacrylate 13 parts by mass 2-hydroxyethyl methacrylate 13 parts by mass AIBN 1.2 parts by mass Toluene 70 parts by mass Ethyl acetate 30 parts by mass

  The mixture having the above composition was heated to 70 ° C. with gentle stirring to initiate polymerization, and stirred at this temperature for 8 hours. Polymer 1 (acrylic resin) having a hydroxyl group having a hydroxyl group in the side chain was obtained. Obtained. The solid content was adjusted to 36% by mass (polymer solution 1).

  The obtained polymer 1 had a Tg of 100 ° C. and a weight average molecular weight of 110,000.

Composition formulation 1
Polymer solution 1 100 parts by mass Hexanediol diacrylate (KS-HDDA) 40 parts by mass Diisocyanate (BXX5627, manufactured by Toyo Ink Co., Ltd.) 0.3 parts by mass Irgacure 651 (manufactured by Ciba Specialty Chemicals) 0. 3 parts by mass Hydroquinone monomethyl ether (MEHQ) 0.01 parts by mass

  The mixture having the above composition was uniformly dissolved and kneaded to obtain a photopolymerizable composition.

(Preparation of photocurable transfer material sheet)
On the surface of a release film prepared as a first long release sheet (width 200 mm, length 300 m, thickness 50 μm; trade name No. 23, manufactured by Fujimori Kogyo Co., Ltd.) A photocurable transfer layer having a thickness of 20 ± 2 μm was formed. On the opposite side of the sheet, a release film (width 200 mm, length 300 m, thickness 38 μm; trade name No. 33, manufactured by Fujimori Kogyo Co., Ltd.) prepared as a second long release sheet was attached. These operations were performed continuously under conveyance.

<Preparation of photocurable transfer disk sheet>
Next, the photocurable transfer material sheet produced as described above was subjected to disk-like punching by rotary die cutting using a die roll machine SRD-W350 (manufactured by Soltec Kogyo Co., Ltd.). The punching process was performed by punching a photocurable transfer material sheet flowing at a line speed of 5 m / min from the first long release sheet side into an inner circle having a diameter of 22 mm and an outer circle having a diameter of 120 mm concentrically. . Punching was performed so that the centers of the concentric circles are located at the center in the width direction of the photocurable transfer material sheet at intervals of 125 mm in the longitudinal direction. The inner circle is punched by punching all three layers of the first long release sheet, the photocurable transfer layer, and the second long release sheet (full cut, full punch). The first long release sheet and the photocurable transfer layer were punched out, and the second long release sheet corresponding to the last one layer was left without being punched (half cut, partial punching). . The inner portion of the inner circle that was fully cut was completely removed as a residue portion, and the peripheral portion of the outer circle that was half-cut was also peeled and removed as a residue portion. Thus, a laminate of the disc-like photocurable transfer layer and the disc-like release sheet provided thereon is provided in the longitudinal direction in a region other than the vicinity of both ends in the width direction of the surface of the long release sheet. A photocurable transfer disk sheet was prepared.

  Furthermore, on the surface of the second long release sheet, the region in the vicinity of both ends in the width direction, that is, the regions on both sides of the laminate (the surface on the side on which the laminate is provided) along the longitudinal direction. Then, an adhesive tape (manufactured by Sumitomo 3M, surface protective tape 330, width 30 mm) was bonded as a spacer layer in a belt shape, and this was wound around a sheet roll. These series of operations were continuously performed under conveyance.

[Example 2]
<Preparation of photocurable transfer material sheet>
A photocurable transfer material sheet was produced in the same manner as in Example 1.

<Preparation of photocurable transfer disk sheet>
A photocurable transfer disk sheet before installation of the spacer layer was prepared in the same manner as in Example 1. And on the surface of the first long release sheet, the region in the vicinity of both ends in the width direction, that is, the regions on both sides of the laminate (the surface on the side where the laminate is not provided) along the longitudinal direction. Adhesive tape (manufactured by Sumitomo 3M, surface protection tape 330, width 30 mm) was bonded as a spacer layer in a band shape (the interval between the adhesive tapes was 125 mm), and this was wound around a sheet roll. These series of operations were continuously performed under conveyance.

[Example 3]
<Preparation of photocurable transfer material sheet>
A photocurable transfer material sheet was produced in the same manner as in Example 1.

<Preparation of photocurable transfer disk sheet>
Except for winding around a sheet roll using a roll (flange with roll) (Showa Maru cylinder, bobbin type core) consisting of a cylindrical part and flanges provided on both sides thereof, the same as in Example 1 It was.

[Example 4]
<Preparation of photocurable transfer material sheet>
A photocurable transfer material sheet was produced in the same manner as in Example 1.

<Preparation of photocurable transfer disk sheet>
This was carried out in the same manner as in Example 2 except that a roll with a flange (made by Showa Marubetsu, bobbin type core) was used to wind the sheet roll.

[Comparative Example 1]
<Preparation of photocurable transfer material sheet>
A photocurable transfer material sheet was produced in the same manner as in Example 1.

<Preparation of photocurable transfer disk sheet>
A photocurable transfer disc sheet was produced in the same manner as in Example 1 without providing a spacer layer, and this was wound around a sheet roll in the same manner as in Example 1.

[result]
When the laminated body was observed by pulling out from the sheet wound 60 hours after winding from the roll of 100 m of the photocurable transfer disk with spacer layer in Examples 1 to 4, the disk shape of the laminated body was deformed. It was not seen, and the layer thickness of the laminate remained uniform and no change was observed. Further, no oozing out of components from the sheet roll was observed, and no collapse was observed in the overall shape of the sheet roll. In particular, the sheet winding of the photocurable transfer disc sheet with the spacer layer of Example 3 and Example 4 does not cause winding misalignment even when it is a sheet winding of 1000 m, and the disk shape and layer thickness of the laminate. No change was observed, and further, the collapse of the overall shape of the sheet roll and the exudation of components were not observed. On the other hand, in the sheet roll of 100 m of the photocurable transfer disc sheet without the spacer layer of Comparative Example 1, the disc shape of the laminate is partially distorted, and the layer thickness of the laminate is not uniform. It was seen. Moreover, the exudation of the component from the sheet roll was observed in a part, and the whole shape of the sheet roll was slightly broken.

  That is, the photocurable transfer disc sheet with a spacer layer of the present invention changes the shape of the wound sheet depending on the load when the roll sheet roll is manufactured and stored, or the sheet roll is tightened. No change in the disk shape of the disk-like photocurable transfer layer, no change in layer thickness, no oozing out of layer components, and large roll diameter without being damaged by its own weight Could be achieved.

It is explanatory drawing explaining an example of the structure of the photocurable transfer disc sheet | seat of this invention. It is explanatory drawing explaining another example of the structure of the photocurable transfer disc sheet | seat of this invention. It is explanatory drawing explaining an example of the flow of manufacture of the photocurable transfer disc sheet | seat of this invention. It is explanatory drawing explaining another example of the flow of manufacture of the photocurable transfer disc sheet | seat of this invention. It is explanatory drawing explaining the continuous winding by the roll with a flange in this invention. It is explanatory drawing of a typical example of the basic structure of a photocurable transfer disk sheet. It is sectional drawing which shows the conventional optical information recording medium. It is sectional drawing which shows another conventional optical information recording medium. It is sectional drawing which shows the procedure of the manufacturing method of the optical information recording medium as described in Nikkei Electronics.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Photocurable transfer disc sheet 11 Elongated release sheet 12d Disc shaped photocurable transfer layer 13d Disc release sheet 15 Laminate 16 Inner hole 17 Spacer layer 20 Photocurable transfer disc sheet 21 Elongated release sheet 22d Disc shaped light Curable transfer layer 23d Disc release sheet 25 Laminate 26 Inner hole 27 Spacer layer 31 Long release sheet 32 Photocurable transfer layer 32d Disc photocurable layer 33 Long release sheet 33d Disc release sheet 35 Laminate 36 Inside Hole 37 Spacer layer 38 Inner circle 39 Outer circle 41 Long release sheet 42 Photocurable transfer layer 42d Disk-like photocurable layer 43 Long release sheet 43d Disc-like release sheet 45 Laminate 46 Inner hole 47 Spacer layer 48 Inner circle 49 Outer circle 51 Long release sheet 52d Disc-like photocuring layer 53d Disc-like release sheet 55 Laminate 57 Spacer layer 60 Photocuring Transfer disc sheet 61 long release sheet 62d disc-like photocurable transfer layer 63d disc-like release sheet 65 laminate 66 inner hole 71 transparent resin substrate 71a reflection layer 72 transparent resin substrate 72a reflection layer 73 adhesive layer 81 substrate 81b half Transparent reflective layer 82 Substrate 82a Reflective layer 83 Adhesive layer 94a Disk substrate 94b Stamper 95A Ultraviolet curable resin 95B Ultraviolet curable resin 96a Reflective layer (recording layer)
96b Reflective layer (recording layer)
97 Cover layer

Claims (24)

Light in which a laminate of a disc-like photocurable transfer layer and a disc-like release sheet provided thereon is provided in the longitudinal direction in a region other than the vicinity of both ends in the width direction on the surface of the long release sheet. A curable transfer disk sheet,
A photocurable transfer disc sheet, wherein a spacer layer is provided in a region in the vicinity of both ends in the width direction on the surface of the long release sheet.   The photocurable transfer disk sheet according to claim 1, wherein the spacer layer is provided on the surface on the side where the laminate is provided.   The photocurable transfer disk sheet according to claim 1, wherein the spacer layer is provided on a surface on the side where the laminate is not provided.   The photocurable transfer disk sheet according to any one of claims 1 to 3, wherein the spacer layer is provided in a strip shape along the longitudinal direction of the long release sheet.   The photocurable transfer disk sheet according to any one of claims 1 to 4, wherein a width of the spacer layer is in a range of 2 to 100 mm.   The photocurable transfer disk sheet according to any one of claims 1 to 5, wherein a thickness of the spacer layer is larger by a thickness in a range of 0 to 100 µm from a thickness of the laminate.   The photocurable transfer disk sheet according to any one of claims 1 to 6, wherein the spacer layer has a thickness in a range of 30 to 250 µm.   The photocurable transfer disc sheet according to any one of claims 1 to 7, wherein the spacer layer is formed of a resin.   The photocurable transfer disk sheet according to any one of claims 1 to 8, wherein the spacer layer is provided by adhering an adhesive tape to the surface of the long release sheet.   The photocurable transfer disk sheet according to any one of claims 1 to 9, wherein the adhesive strength of the adhesive tape is in the range of 0.1 to 10 N / cm.   The photocurable transfer according to any one of claims 1 to 10, wherein the adhesive tape includes a base material and an adhesive layer provided on the base material, and the base material is made of a flexible resin film. Disc sheet.   The photocurable transfer disk according to any one of claims 1 to 11, wherein the adhesive tape includes a base material and an adhesive layer provided on the base material, and the adhesive layer includes a rubber-based adhesive. Sheet. It is a sheet roll formed by winding the photocurable transfer disk sheet according to any one of claims 1 to 12 on a cylindrical portion of a roll comprising a cylindrical portion and flanges provided on both side surfaces thereof. ,
A sheet roll supported by the flange.   The sheet winding according to claim 13, wherein the flange has light shielding properties. The following steps:
A) A step of laminating a photocurable transfer layer and a long release sheet in order on the surface of the long release sheet under conveyance to form a photocurable transfer material sheet,
B) The photocurable transfer material sheet is subjected to a disk-like punching process from the side of one long release sheet, and a disk-like shape is formed in a region other than the vicinity of both ends in the width direction on the surface of the other long release sheet. Leaving the laminate of the photocurable transfer layer and the disc-like release sheet in the longitudinal direction;
C) A step of providing a spacer layer in the form of a band along the longitudinal direction in a region in the vicinity of both ends in the width direction on the surface of the long release sheet,
A method for producing a photocurable transfer disk sheet, comprising:   The manufacturing method according to claim 15, wherein the step C) provides a spacer layer on the surface on the side where the laminate is provided.   The manufacturing method according to claim 15, wherein the step C) provides a spacer layer on the surface on the side where the laminate is not provided. Said step B) comprises the following steps:
B1) As a disc-like punching process, punching an outer circle that punches two layers of one long release sheet and a photocurable transfer layer in a region other than the vicinity of both ends in the width direction of the surface of the long release sheet; A process of punching an inner circle for punching three layers of one long release sheet, a photocurable transfer layer and the other long release sheet, by arranging the outer circle and the inner circle concentrically,
B2) peeling the two layers around the punched outer circle and leaving a laminate of the disc-like photocurable transfer layer and the disc-like release sheet in the longitudinal direction on the other long release sheet;
The manufacturing method in any one of Claims 15-17 containing this. The following steps:
A) A step of laminating a photocurable transfer layer and a long release sheet in order on the surface of the long release sheet under conveyance to form a photocurable transfer material sheet,
D) a step of providing a spacer layer in the vicinity of both ends in the width direction of the surface of one long release sheet;
E) The photocurable transfer material sheet is subjected to disc-like punching from the side of the long release sheet not provided with the spacer layer, and the spacer layer of the long release sheet provided with the spacer layer is provided. A step of leaving a laminate of the disc-shaped photocurable transfer layer and the disc-shaped release sheet in the longitudinal direction in a region other than the vicinity of both ends in the width direction of the surface on the non-side,
A method for producing a photocurable transfer disk sheet, comprising: Said step E) comprises the following steps:
E1) As a disc-like punching process, in a region other than the vicinity of both ends in the width direction of the surface of the long release sheet,
Punching out an outer circle that punches out two layers of a long release sheet and a photocurable transfer layer not provided with a spacer layer; and
Punching the inner circle punching out three layers of the long release sheet without the spacer layer, the photocurable transfer layer and the long release sheet with the spacer layer, the outer circle and the inner circle are arranged concentrically Process
E2) peeling the two layers around the punched outer circle and leaving a laminate of the disc-like photocurable transfer layer and the disc-like release sheet in the longitudinal direction in the region of the surface of the long release sheet;
The manufacturing method of Claim 19 containing this.   The manufacturing method according to any one of claims 15 to 20, wherein, in the step C) or the step D), the spacer layer is provided by adhering an adhesive tape to the surface of the long release sheet. After the step C) or the step E), the following step:
F) A step of continuously winding the photocurable transfer disk sheet around a cylindrical portion of a roll comprising a cylindrical portion and flanges provided on both side surfaces thereof,
The manufacturing method according to any one of claims 15 to 21, wherein: is provided.   The manufacturing method according to claim 22, wherein the flange has light shielding properties.   A photocurable transfer disk sheet produced by the production method according to any one of claims 15 to 23.

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