WO2008026277A1

WO2008026277A1 - Method for producing photo-curing transfer disc sheet suitable for production of optical information recording medium, and photo-curing transfer disc sheet produced by that method

Info

Publication number: WO2008026277A1
Application number: PCT/JP2006/317204
Authority: WO
Inventors: Hideki Kitano; Takato Inamiya; Kenji Murayama
Original assignee: Bridgestone Corporation
Priority date: 2006-08-31
Filing date: 2006-08-31
Publication date: 2008-03-06

Abstract

A method for producing a photo-curing transfer disc sheet suitable for continuous processing of a long photo-curing transfer material sheet under conveyance wherein precision of punching depth is achieved in punching work, and precision of circularity of disc shape is enhanced furthermore while collapse of the punching cross-section is avoided. The method for producing a photo-curing transfer disc sheet by pressing a roll rotated in synchronism with conveyance and having a punching blade projecting from the surface against the surface of a photo-curing transfer material sheet under conveyance, thereby punching the photo-curing transfer material sheet into a disc shape, the production method being characterized in that the tip of the punching blade has an elliptical plan view elongated in the conveyance direction of the photo-curing transfer material sheet on the plan development of the roll surface.

Description

Specification

Method for producing photocurable transfer disk sheet suitable for production of optical information recording medium, and photocurable transfer disk sheet produced by the production method

Technical field

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

Background art

[0002] Audio CDs and CD-ROMs are widely used as recorded optical information recording media with pits formed on the surface as digital signals. Recently, pit recording is possible on both sides that can also record moving images. It has been attracting attention as a next-generation recording medium for DVD-powered CDs and has already been used. Also, CD-R, CD-RW, DVD-R, DVD-RW, etc., which can be recorded by the user in which the pits and groups are formed, are already used.

[0003] Conventionally, a double-sided DVD has been manufactured by melting a polycarbonate resin using a stamper in which the unevenness of the signal bit is opposite to that of a male and female, and injection molding to form a transparent surface having unevenness on the surface. A reflective substrate is prepared by depositing a metal such as aluminum on the uneven surface by sputtering or the like, and a transparent resin substrate on which the reflective layer is formed is made to face the reflective layer with an adhesive. It was done by pasting together.

[0004] On February 10, 2002, the unified standard "Blue-ray Disc" for the next-generation optical disc was proposed. Main specifications are recording capacity: 23.3 / 25 / 27GB, laser wavelength: 40 5nm (blue-violet laser), lens numerical aperture (N / A): 0.85, disc diameter: 120mm, disc thickness: 1. 2mm, track pitch: 0.32 m, etc.

[0005] As described above, in the Blu-ray disc, the width of the groove is narrow and the pit is also small. For this reason, it is necessary to reduce the spot of the reading laser to a small size. When the spot is reduced, the disc tilt is greatly affected. Cannot play even if it is bent. In order to compensate for these disadvantages, it is considered to reduce the thickness of the substrate and the thickness of the cover layer on the pit on the laser irradiation side to about 0.1 mm.

[0006] Non-Patent Document 1 on page 68 describes a DVD manufacturing method that meets the above requirements. This will be explained with reference to FIG. Polycarbonate having a reflective layer (or recording layer) on the concave / convex surface is provided by applying ultraviolet curing resin 75A on the reflective layer of the disc substrate (l.lmm) 74a having the reflective layer (or recording layer) 76a on the concave / convex surface. An ultraviolet curable resin 75B is provided on the stamper 74b 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 curing resins 75A and 75B. The stamper 74b is removed from the UV-cured resin 75B layer, a reflective layer (or recording layer) 76b is formed on the uneven surface, and a cover layer (thickness of about 0.1 mm) 77 is formed thereon.

[0007] In the above method, the surface of the disk substrate and the stamper is provided with an ultraviolet curable resin 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 coating and reversal, and when pasting the substrate and the stamp by reversing, there is a disadvantage such as the generation of bubbles when contacting the viscous UV-cured resin. There is a problem that good pasting cannot be performed. Further, the ultraviolet ray curable resin has a problem that deformation such as warpage of a medium resulting in large shrinkage during curing is conspicuous.

[0008] Patent Document 1 (WO03Z032305A1) discloses a method of manufacturing an optical information recording medium such as a DVD that can improve the above-mentioned problems. Here, a production method using a photocurable transfer sheet containing a reactive polymer having a photopolymerizable functional group and having a photocurable composition that can be deformed by pressurization is described. That is, instead of the ultraviolet curable resin, the above-mentioned problem can be avoided by transferring the concave and convex surfaces by pressing the solid photocurable transfer sheet against the stamper.

[0009] As a photocurable transfer sheet used in the above-described manufacturing method of an optical information recording medium such as a DVD, a disk-shaped photocurable transfer layer and a disk-shaped release sheet are provided on the surface of the long release sheet. Photocurable transfer disc sheets, which are sequentially laminated, have recently been used. Figure 6 shows a typical example of the basic structure of such a photocurable transfer disk sheet. The 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 the long release sheet 61 to form a photocurable transfer disc sheet 60. ing. 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, it can be advantageously used in the production of optical information recording media such as DVDs by peeling the upper and lower release sheets. It has become. Such a photocurable transfer disk sheet is obtained by performing a disk-like 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 be manufactured.

Patent Document 2 (Japanese Patent Application Laid-Open No. 2004-79052) discloses a punching process using a punching blade provided annularly on the surface of a rotating mouth ring as such a punching cage, An optical disk manufacturing method using a so-called rotary die-cut punching process for a laminated sheet material is disclosed!

[0011] Patent Literature l: WO03Z〇32305Al

Patent Document 2: JP 2004-79052 A

Non-Patent Document 1: Nikkei Electronics (Nikkei Electronics), November 5, 2001 Disclosure of Invention

Problems to be solved by the invention

[0012] The disc-shaped punching process of the photocurable transfer material sheet is required to be continuously performed while the long photocurable transfer material sheet is conveyed, and punching with higher accuracy is required. Required. This high accuracy is required in two ways. First of all, due to the properties required for optical information recording media, the disk shape must be very close to a perfect circle, and for this reason, a highly accurate perfect circular shape is required. Next, for the purpose of providing a disk-shaped laminate on the sheet, the outer circle to be punched punches out the first release sheet and the photocurable transfer layer, while leaving the second release sheet without punching. Punching depth (a half cut compared to a full cut that completely punches the second release sheet) is required. Not. That is, the accuracy of the punching depth is required. Furthermore, it is required to maintain a laminated structure with a thickness before cutting so that the laminate on the cut surface is not crushed. However, according to the study by the present inventors, punching by so-called rotary die cutting as disclosed in Patent Document 2 (Japanese Patent Laid-Open No. 2004-79052) is a long light under conveyance. It is suitable for production processes that continuously process curable transfer material sheets, achieves stable punch depth accuracy, and avoids crushing of punched sections. It turned out that it was difficult to achieve sufficient accuracy when trying to increase the accuracy further.

[0014] On the other hand, a normal punching process that is not a rotary die cut, that is, a sequential punching process using a so-called Thomson blade or a Victoria blade, is not easy to achieve with the above-described punching depth accuracy stable. In addition, the sheet tends to be crushed, and is not very suitable for production processes that continuously process long sheets under conveyance.

[0015] Therefore, the object of the present invention is suitable for continuous processing of a long photocurable transfer material sheet under conveyance, achieves the accuracy of the punching depth in the punching process, and avoids crushing of the punched section. The object of the present invention is to provide a method for producing a photo-curing transfer disc sheet, which further improves the accuracy of a disc-shaped perfect circle.

[0016] Also, an object of the present invention is to provide a photocurable transfer disk sheet that is manufactured by the above manufacturing method and provided with a highly accurate disk-shaped laminate suitable for manufacturing an optical information recording medium. is there.

Means for solving the problem

[0017] The present inventors aim to press the roll having a punching blade protruding on the surface of the photocurable transfer material sheet under conveyance by rotating it in synchronization with the conveyance. Therefore, a method for producing a photocurable transfer disk sheet by performing a punching process for punching the photocurable transfer material sheet into a disk shape,

The planar shape of the cutting edge of the punching blade in the plane development view of the surface of the roll is achieved by a manufacturing method characterized by having an elliptical shape that is long in the conveying direction of the photocurable transfer material sheet. I saw and started.

[0018] By such a manufacturing method, a photo-curable transfer disk sheet can be manufactured in which the precision of the disk-shaped perfect circle is further improved.

[0019] The inventors of the present invention, the deviation from the perfect circle of punching by so-called rotary die cut, This was thought to be due to punching in the stretched state in the transport direction as a result of receiving tension in the transport direction at the part where the transported sheet was cut. In other words, the disk-shaped laminate thus produced is not subjected to tension thereafter, and contracts and is used for the subsequent use. Therefore, the true circular shape force of the rotary die-cut punching blade is expected. It is thought that the disk will not satisfy the accuracy of the circle. Therefore, paying attention to this point, an elliptical punching blade (the plane of the cutting edge of the punching blade in the plan view of the roll surface in advance) so that the desired circular shape is obtained when the tension is removed. The present invention has been conceived of the present invention in which rotary die cutting is performed using a punching blade having an elliptical shape that is long in the conveying direction of the photo-curable transfer material sheet.

In the present invention, the elliptical shape has the following formula I:

2/2, 2 2

X / p + y = r

(However, the conveyance direction of the photocurable transfer material sheet is the X axis, the roll axial direction is the y axis, r is the minor axis radius of the ellipse,

p X r is the major axis radius of the ellipse, and

ρ> 1)

It is preferable that it is the ellipse shape represented by these. The P is preferably in the range of 1.1≥ρ> 1. By using the oval shape thus defined, the present invention can be suitably implemented.

[0021] Further, in a more preferred embodiment of the present invention, the shape of the cutting edge of the punching blade in a plan development view of the surface of the roll in plan view is an oval shape represented by the above formula I. The blade

The oval shape

r = r and p = p (where 1. l≥p> 1)

An inner blade that is

The oval shape

r = r and p = p (where 1. l≥p> 1)

b b b

Is the following conditions:

rr It is preferable that the two ellipses are arranged so that the centers of the two ellipses are the same. [0022] It is preferable that p and 1S p≥p have a relationship. The relationship between the inner and outer blades

a b a

By adopting an elliptical shape, the inner and outer circles of concentric circles that are punched as a result can be made closer to a perfect circle.

[0023] The p of such a relationship is in the range of the p force 1. 04≥p> 1.00, and

a b a a

The p-force is preferably in the range of 1.10≥p≥1.04. B b in this range

As a result, it is possible to simultaneously prevent damage to the sheet material due to excessive tension and improve production efficiency by high-speed conveyance of the sheet material.

[0024] The present invention also provides 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) One of the long release sheets of the long release sheet so that an inner circle is punched concentrically inside the outer circle in a plan view in a region in the center in the width direction of the surface of the photocurable transfer material sheet Punching the outer circle that punches two layers of the release sheet and the photocurable transfer layer, and the inner circle that punches three layers of the one long release sheet, the photocurable transfer layer, and the other long release sheet Punching

It is performed by rotating and pressing a roll having an inner circle punching blade and an outer circle punching blade projecting on the surface of the photocurable transfer material sheet to be conveyed in synchronization with the conveyance. Process,

C) Step of peeling 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 A method for producing a photocurable transfer disk sheet comprising:

The shape of the cutting edge of the inner circle punching blade in a plan view and the shape of the cutting edge of the outer circle punching blade in a plan view are both in the plane development view of the surface of the roll. There is also a manufacturing method characterized by having an elliptical shape that is long in the conveying direction, and that the centers of the two ellipses are the same. From production of photocurable transfer material sheets to production of photocurable transfer disk sheets by such production methods Can be suitably implemented.

[0025] Further, in the manufacturing method of the present invention, the photocurable transfer material sheet is conveyed such that an ellipse punched by the punching blade becomes a perfect circle without being subjected to a tension force due to conveyance. It is preferable to increase or decrease the speed. By adjusting the conveyance speed in this way and optimizing the oval shape of the punching blade and the apparatus including the conveyed sheet, roll, etc., it is possible to obtain a punching shape extremely close to a perfect circle. .

[0026] Further, the present invention is also in a photocurable transfer disk sheet manufactured by the above-described manufacturing method.

[0027] The production method of the present invention is suitable for continuous processing of a long photocurable transfer material sheet under conveyance, achieves the accuracy of the punching depth in the punching process, and avoids crushing of the punched section. In addition, the accuracy of the disc-shaped perfect circle can be further improved to produce a photocurable transfer disc sheet. Compared to the case of using sequential punching such as Thomson blades, it is superior in punching depth accuracy and avoiding crushing of the punching section. It is excellent in terms of the accuracy of the perfect circle and the accuracy of the perfect circle of the shape of the hole in the center of the disk. For this reason, the obtained optically curable transfer disk sheet is provided with a disk-shaped laminate having high thickness accuracy, uniformity, and roundness accuracy required for optical information recording media such as DVDs. It is particularly suitable for the production of high-precision optical information recording media.

[0028] The present invention also resides in a photocurable transfer disk sheet having the above-described excellent characteristics.

Brief Description of Drawings

FIG. 1 is an explanatory diagram of an example of a rotary die cutter used in the production method of the present invention.

FIG. 2 is a cross-sectional view illustrating an example of a flow in which a rotary die cutter is used for a sheet under conveyance in the present invention.

FIG. 3 is an explanatory diagram showing an example of a flow for producing a photocurable transfer disc sheet from a photocurable transfer material sheet by the production method of the present invention.

FIG. 4 is an explanatory view of an elliptical shape of a cutting edge of a punching blade used in the manufacturing method of the present invention. [5] FIG. 5 is a development view illustrating a punching blade having a circular cutting edge.

[6] It is an explanatory view of a typical example of the basic structure of the photocurable transfer disk sheet.

FIG. 7 is a cross-sectional view showing a procedure of a method for manufacturing an optical information recording medium described in Nikkei Electronics.

Explanation of symbols

10 Rotary da icatta

11 P—Nore surface

15 Inner blade of punching blade

15a Punching blade inner blade

15b Punching blade inner blade

16 Outer blade of punching blade

16a Outer blade of punching blade

16b Outer blade of punching blade

20 Die roll

21 P—Nore surface

22 Anvil Roll

25 Inner blade of punching blade

25a Inner blade of punching blade

25b Inner blade of punching blade

26 Outer blade of punching blade

26a Outer blade of punching blade

26b Outer blade of punching blade

29 Conveyed sheet

31 Long release sheet

32 Light-curing transfer layer

32d disk-shaped photocuring layer

33 Long release sheet 33d Disc release sheet

35 Laminate

36 bore

38 inner circle

39 Outer circle

51 Unfolded roll surface

55 inner blade

56 Outer blade

60 Light curable transfer disc

61 Long release sheet

62d disk-like photocurable transfer layer

63d Disc release sheet

65 Laminate

66 bore

74a disk substrate

74b stamper

75A UV-cured resin

75B UV-cured resin

76a Reflective layer (recording layer)

76b Reflective layer (recording layer)

77

BEST MODE FOR CARRYING OUT THE INVENTION

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

FIG. 1 is a diagram for explaining a typical example of a roll (rotary die cutter) having a punching blade protruding on the surface used in the manufacturing method of the present invention. Figure 1 (1—

1) is an upper perspective view of an example of a roll (rotary die cutter) having a punching blade used in the present invention. The rotary die cutter 10 is provided with an inner blade 15, an outer blade 16, a force S, and a roll surface 11 protruding from the punching blade. This projecting on the surface The punching blade is pressed against the sheet by rotating in synchronization with the sheet to which the roll is conveyed, and simultaneously punches the inner circle and the outer circle on the sheet. The shape of the punched circle formed on the sheet immediately after being punched is the shape indicated by the inner blade 15 and the outer blade 16 on the development view in which the roll surface 11 is developed on a flat surface, assuming that there is no slippage of the sheet. Become.

[0033] FIG. 1 (12) is a plan view of the roll surface 11 developed in the upper perspective view of (11). The inner blade 15 and the outer blade 16 are arranged concentrically, and both of the blade edges have an elliptical shape that is long in the X-axis direction. In (12), the sheet conveying direction is the X axis and the roll axial direction is the y axis, which corresponds to the X axis and y axis of the above formula I. The sheet is punched into such an elliptical shape while being stretched in the conveyance direction under the tension under conveyance, and for this reason, the disk-shaped laminate formed thereby has a subsequent tension. In the state of being removed and contracted, the disk (and its inner hole) is very close to a perfect circle.

[0034] For comparison with (1 2) in FIG. 1, a development view in which the roll surface of a rotary die cutter provided with a punching blade of a circular edge instead of an elliptical shape on the roll surface is developed on a plane is shown. An example is shown in FIG. On the developed roll surface 51, the inner blade 55 and the outer blade 56 are arranged concentrically, and both of them have a perfect circle shape. The sheet is punched in such a perfect circle shape while being stretched in the conveyance direction under the tension under conveyance. For this reason, the disk-shaped laminate formed by this is subsequently subjected to tension. In the state of being removed and contracted, it becomes an elliptical disk (and its inner hole) that is long in the y-axis direction, and a highly accurate perfect circle cannot be achieved.

[0035] (13) in FIG. 1 is a cross-sectional view in a section perpendicular to the axis of the roll, including BB ', in the upper perspective view of (11). The oval-shaped punching blades (inner blade 15a, inner blade 15b, outer blade 16a, outer blade 16b) are all shown as needle-like protrusions perpendicular to the roll surface 11 in (1-3). The inner blades 15a and 15b perform so-called full force punching on the photocurable transfer material sheet, and the outer blades 16a and 16b perform so-called half-cut punching (described later). Therefore, the height of the outer blade of the punching blade is set lower than the height of the inner blade by an amount corresponding to the thickness of the long release sheet layer left without being punched.

FIG. 2 is a cross-sectional view illustrating a flow in which the above-described rotary die cutter is used for a sheet under conveyance. The die roll 20 has an axial direction as shown in Fig. 1 (1-3). The roll surface 21 is provided with a punching blade (an inner blade 25a, an inner blade 25b, an outer blade 26a, and an outer blade 26b) protruding from the roll surface 21. The sheet 29 conveyed in the direction of the arrow is pressed against the surface of the die roll 20 by the anvil roll 22. The anvil-up roll 23 suppresses slippage between the anvil roll 22 and the sheet under conveyance by pressing the sheet 29 against the anvil roll 22. The die roll 20 synchronizes with the anvil roll 22 and punches out the sheet conveyed while receiving tension in the conveying direction with a punching blade. The sheet to be transported should be designed to avoid stretching as much as possible in the vicinity of contact with the die roll, and it is desirable to design U. It is unavoidable to apply tension in actual transport. . Therefore, in the present invention, punching with respect to an elongated sheet is supported by punching with an elliptical punching blade (ellipse-shaped cutting edge punching blade).

[0037] In the production method of the present invention, the speed of conveyance of the photocurable transfer material sheet is further adjusted so that the ellipse punched by the punching blade becomes a perfect circle without being subjected to the tension force of conveyance. It is preferable to increase or decrease. By adjusting the conveying speed in this way and optimizing the oval shape of the cutting edge of the punching blade and the apparatus including the conveyed sheet, roll, etc., a punching shape extremely close to a perfect circle can be obtained. Can do.

[0038] According to further advanced knowledge of the present inventors, the punching blade rotates in synchronization with the transport roll, while the sheet is transported while slipping between the transport roll. The planned position where the punching blade comes into contact with the sheet may also shift. This seems to be another factor in producing a disc that does not meet the expected accuracy of a perfect circle when using a round-shaped rotary die-cut punching blade. The above-mentioned optimization by adjusting the conveyance speed is considered to be useful for improving the accuracy of the complete circle taking these factors into account.

FIG. 3 is an explanatory diagram illustrating an example of a flow of manufacturing a photocurable transfer disk sheet from a photocurable transfer material sheet by the manufacturing method of the present invention. First, a long release sheet 31, a photocurable transfer layer 32, and a long release sheet 33 are laminated by a process (not shown) to form a photocurable transfer material sheet ((3-1) in Fig. 3). ). Next, a rotary die-caster using a punching blade provided in an elliptical shape on the roll surface under transport with tension applied to the sheet. A sheet with the inner circle 38 and the outer circle 39 punched concentrically ((3-2) in Fig. 3) is manufactured by punching with a sheet (step D). The inner circle 38 penetrates through the three layers of the long release sheet 31, the photo-curable transfer layer 32, and the long release sheet 33 (full cut, full removal). On the other hand, the outer circle 39 penetrates up to two layers of the photocurable transfer layer 32 and the long release sheet 33 (half cut, half cut). The three-layered cylinder inside the inner circle is removed as a scum part, and the peripheral part of the outer circle is also removed as a scum part (Step E). The cylinder inside the inner circle can be removed at the same time as punching. As a result, a laminated body 35 having an inner hole 36 and comprising a disc-like photocuring layer 32d and a disc-like release sheet 33d is formed on the long release sheet 31 ((3 in FIG. 3). — 3)). Elongation force due to transport tension The layered structure in the released state has a disk shape very close to a perfect circle, and has an inner circle with a shape very close to a perfect circle. Fig. 3 (3-4) shows a cross-sectional view of the sheet shown in Fig. 3 (3-3) cut along the cross section including CC. On the surface of the long release sheet 31, a laminate 35 of a disc-like photocurable transfer layer 32d and a disc-like release sheet 33d is laminated to form a photocurable transfer disc sheet 30. An inner hole 36 is provided through the laminate 35 and the long release sheet 31.

That is, the present invention includes the following steps:

C) Step of peeling 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 , A method for producing a photocurable transfer disk sheet comprising:

The shape of the cutting edge of the inner circle punching blade in a plan view and the shape of the cutting edge of the outer circle punching blade in a plan view are both in the plane development view of the surface of the roll. There is also a manufacturing method characterized by having an elliptical shape that is long in the conveying direction, and that the centers of the two ellipses are the same.

FIG. 4 is a view for explaining the elliptical shape of the cutting edge of the punching blade shown on the development view of the roll surface. The elliptical shape is the following formula I:

2/2, 2 2

X / p + y = r

p Xr is the major axis radius of the ellipse, and

ρ> 1)

The shape is represented by The P is preferably in the range of 1.1≥ρ> 1. By using the oval shape thus defined, the present invention can be suitably implemented. By carrying out such that this category is contained, the sheet can be forcibly stretched without damaging the disk stack.

In a preferred embodiment of the present invention, the punching blade forces of both the inner blade (inner circle punching blade) and the outer blade (outer circle punching blade) as described above are provided on the roll surface. Yes. That is, the elliptical shape of the cutting edge is

r = r and p = p (where 1. l≥p> 1)

The inner blade and the elliptical shape of the cutting edge are

r = r and p = p (where 1. l≥p> 1)

b b b

Is the following conditions:

r r

b a

And the two ellipses are arranged so that their centers are the same (see (1 1) in FIG. 1).

[0043] It is preferable that p and p have a relationship of p≥p that can be changed independently a b a

. As a result, the inner and outer blades are punched as a result of the oval shape. The inner and outer circles of the concentric circles can be made closer to a perfect circle.

[0044] Further, the p of such a relationship is in the range of the p force 1.04≥p> 1.00, and

a b a a

One

The p-force is preferably in the range of 1.10≥p≥1.04. Based on the knowledge of the present invention b b

Therefore, high-speed sheet conveyance for improving production efficiency is accompanied by an increase in the tension applied to the sheet material.

a and b will take larger values. However, excessive tension is undesirable because it damages the sheet material. I.e. p

By setting a and b to a value in the above range, it is possible to simultaneously prevent damage to the sheet material due to excessive tension and improve production efficiency by high-speed conveyance of the sheet material. And within this range p and

a b

By further adjusting the conveying speed of the sheet material with respect to the blade and the outer blade, the preferred embodiment of the present invention can be realized.

In the present invention, the punching blades (inner blade and outer blade) protrude from the roll surface vertically, preferably over the entire circumference of the elliptical shape, provided that the roll surface force also protrudes. However, the sharpness can be changed by changing the angle of the protrusion. The height of the punching blade is preferably changed according to the thickness of the punched sheet. In the preferred embodiment described above, since the outer blade of the punching blade is half-cut and the inner blade is full-cut, the height of the outer blade is the thickness of the long release sheet layer that remains without being punched. The height is set lower than the height of the inner cutter. The punching blade can be of a general material used as a rotary die cutter, and for example, steel, steel alloy, particularly stainless steel, and ceramic are preferable.

[0046] The photocurable transfer material sheet processed by the production method of the present invention, the photocurable transfer layer used in the photocurable transfer disk sheet, the material of the long release sheet, and the like will be described below. To do.

[0047] 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. Any material that can be made into a layer that can be cured by irradiation (radiation irradiation including visible light irradiation and ultraviolet irradiation) can be used. Furthermore, it is a layer that is easily deformed by pressurization, and the transfer layer is formed by slightly crosslinking the reactive polymer. Any material can be suitably used as long as it can form a layer that has a suppressed thickness variation.

[0048] In addition, the disk-shaped photocurable transfer layer material after curing has a light transmittance in the wavelength region of 380 to 420 nm of 70 so that it can be easily read by a reproduction laser in order to increase the density of information. % Or more is preferable. 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 photocurable transfer material sheet can be advantageously used in a method for reproducing a pit signal using a laser having a wavelength of 380 to 420 nm.

[0049] Examples of such a material include a photocurable composition. Such a photocurable composition generally includes a polymerizable compound having a photopolymerizable functional group (monomer and Z or oligomer). ), A photopolymerization initiator, an additive and the like. As the photopolymerizable functional group, a polymerizable compound having an ethylenic double bond (preferably an atalyloyl group or a methacryloyl group) is preferable.

[0050] Examples of the polymerizable monomer having a photopolymerizable functional group include alkyl acrylates (eg, methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethyl hexyl acrylate) and Z or Examples thereof include alkyl metatalates (eg, methyl metatalylate, ethyl methacrylate, butyl metatalylate, 2-ethylhexyl methacrylate).

[0051] The polymerizable monomer preferably contains 1 to 50 mol%, particularly 5 to 30 mol% of a photopolymerizable functional group. As the photopolymerizable functional group, an alitaroyl group, a methacryloyl group, and a vinyl group are preferable, and an attaloyl group and a methacryloyl group are particularly preferable.

[0052] The above-mentioned photocurable composition preferably further contains a reactive diluent having a photopolymerizable functional group. As a reactive diluent, for example, 2-hydroxyethyl (meth) atalyl

2-Ethylhexyl polyethoxy (meth) acrylate, benzyl (meth) acrylate, isobutyl (meth) acrylate, phenoloxyl (meth) acrylate, tricyclodecanomono (meth) acrylate Dicyclopente-Luxetetyl (meth) atalylate, Tetrahydrofurfuryl (meth) atalylate, Ataliloylmorpholine, N-Bielcaprolatatam, 2-Hydroxyl-3-phenoloxypropyl (meth) atalylate, o-phenol-l-oxyl Shetyl (meth) acrylate, neopentyl glycol di (meth) acrylate, neopentyl glycol dipropoxydi (meth) acrylate, hydroxypentylglycol dipentylglycol di (meth) acrylate, tricyclodecane dimethylol di ( (Meth) Atalylate, 1, 6-Hexanedioldi (Meth) Athalylate, Nonanedioldi (Meth) Atalylate, Trimethylolpropane Tri (Meth) Atalylate, Pentaerythritol Tri (Meth) Atalylate, Pentaerythritol Tetra (Meth ) (Meth) acrylate monomers such as attalylate, tris [(meth) attachyschetil] isocyanurate, ditrimethylolpropane tetra (meth) acrylate, polyol compounds (eg, ethylene glycol, pro Lene 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 dimethylolcyclohexane, bisphenol A polyethoxydiol, polyols such as polytetramethylene glycol, the polyols and succinic acid, maleic acid, itaconic acid, adipic acid, hydrogenated dimer acid, phthalic acid, Polyester polyols which are reaction products of polybasic acids such as isophthalic acid and terephthalic acid or their anhydrides, poly force prolatathone polyols which are a reaction product of the aforementioned polyols and ε-strength prolatatone, Polyol And reaction products of polybasic acids or their anhydrides with ε-force prolatatatone, polycarbonate polyols, polymer polyols, etc.) and organic polyisocyanates (eg, tolylene diisocyanate, isophorone diisocyanate, Range isocyanate, diphenylmethane 4, 4'-diisocyanate, dicyclopentadidiisocyanate, hexamethylene diisocyanate, 2, 4, 4'-trimethylhexamethylene diisocyanate, 2, 2 ', 4 trimethylhexamethylene diisocyanate) and hydroxyl group-containing (meth) acrylate (eg 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxy butyl ( (Meth) Atarylate, 2 Hydroxy-3 Hue-Luoxypropyl (Meth) Ataryl , Cyclohexane mono 1,4 dimethylol mono (meth) acrylate, pentaerythritol tri (meth) acrylate, glycerol di (meth) acrylate, etc.) polyurethane (meth) acrylate, bis Bisphenol epoxy resin such as phenol type epoxy resin, bisphenol F type epoxy resin and (meth) acrylic Examples include (meth) acrylate oligomers such as bisphenol type epoxy (meth) acrylate which are reaction products of acids. These compounds with photopolymerizable functional groups are

One kind or a mixture of two or more kinds can be used.

[0053] As the photopolymerization initiator, any known photopolymerization initiator can be used. Those having good storage stability after blending are desirable. Examples of such photopolymerization initiators include benzoin series such as acetophenone series, benzyl dimethyl ketal, benzophenone series, isopropyl thixanthone, thixanthone series such as 2-4 jetylthioxanthone, and other special ones. Methyl phenyl oxylate can be used. Particularly preferred are 2-hydroxy-2-methyl-1-phenolpropane-1-one, 1-hydroxycyclohexyl phenol ketone, 2-methyl-1-one (4 (methylthio) phenol) -2-morpholinopropane. 1, benzophenone and the like. These photopolymerization initiators may contain one or more known photopolymerization accelerators such as benzoic acid type or tertiary amine type such as 4-dimethylaminobenzoic acid in any proportion as necessary. Can be used as a mixture. In addition, it can be used alone or as a mixture of two or more photopolymerization initiators. In general, the photocurable initiator preferably contains 0.1 to 20% by mass, particularly 1 to 10% by mass of a photopolymerization initiator.

[0054] Among the photopolymerization initiators, as the acetophenone polymerization initiator, for example, 4-phenoxydichloroacetophenone, 4-tert-butyl-dichloroacetophenone, 4-tert-butyl-chloroacetophenone, diethoxya Cetofenone, 2-hydroxy-1-2-methyl 1-phenolpropane 1-one, 1- (4-isopropylphenol) 2 Hydroxy-2-methylpropane 1-one, 1- (4-dodecylphenol) ) 2-Hydroxy-1-2-Methylpropan-1-one, 4- (2-Hydroxyethoxy) 1-Phenol (2-Hydroxy1-2propyl) Ketone, 1-Hydroxycyclohexyl phenyl ketone, 2-Methyl 1- (4 — (Methylthio) phenol) 2-morpholinopropane 1-1, and other benzophenone polymerization initiators include benzophenone, benzoylbenzoic acid, I le benzoate, 4 Hue - Le benzophenone, hydroxy benzophenone, 4-Bentsuzoiru 4'Mechirujifue - Le sulfide, 3, 3 '- such as dimethyl 4-methoxy benzophenone can be used.

[0055] As the acetophenone polymerization initiator, in particular, 2-hydroxy-1,2-methyl 1-phen- Preferred are 1-propane, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1 (4 (methylthio) phenol) 2 morpholinopropane 1. As the benzophenone-based polymerization initiator, benzophenone, benzoylbenzoic acid, and methyl benzoylbenzoate are preferable. Tertiary amine amine photopolymerization accelerators include triethanolamine, methyljetanolamine, triisopropanolamine, 4,4'-dimethylaminobenzenphenone, 4,4, -jetylaminobenzenphenone, 2 Examples include dimethylaminobenzoyl ethyl, 4 dimethylaminobenzoic acid ethyl, 4 dimethylaminobenzoic acid (n-butoxy) ethyl, 4-dimethylaminobenzoic acid isamyl, 4-dimethylaminobenzoic acid 2-ethylhexyl and the like. Particularly preferable examples of the photopolymerization accelerator include 4-dimethylaminobenzoyl ethyl, 4 dimethylaminobenzoate (n-butoxy) ethyl, isamyl dimethyl 4-dimethylaminobenzoate, and 2-ethylhexyl 4-dimethylaminobenzoate.

[0056] The mass ratio of the photopolymerizable compound to the photopolymerization initiator is generally preferably in the range of 40 to: LOO: 0.1 to 10, particularly 60 to: LOO: 1 to 10.

[0057] It is preferable that the photocurable composition is designed so that the photocurable transfer layer satisfies a glass transition temperature of 20 ° C or lower and a transmittance of 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 has the flexibility to closely follow the uneven surface even at room temperature. it can. In particular, the glass transition temperature is in the range of 15 ° C to -50 ° C, in particular 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 the photopolymerization initiator, it is preferable to add a thermoplastic rosin and other additives as described below, if desired.

[0058] As another additive, a silane coupling agent (adhesion promoter) can be added. Examples of the silane coupling agent include butyltriethoxysilane, butyltris (methoxyethoxy) silane, γ-methacryloxypropyltrimethoxysilane, butyltrioxysilane, γ-glycidoxypropyltrimethoxysilane, and γ-glycid. Xylpropinoletriethoxy silane, β- (3,4 Epoxycyclohexyl) ethyltrimethoxysilane, Ύ Chlorop Mouth pyrmethoxysilane, butyltrichlorosilane, γ-mercaptopropyltrimethoxysilane

, Γ-aminopropyltriethoxysilane, N-j8 (aminoethyl) γ-aminopropyl trimethoxysilane, and the like. These can be used alone or in combination of two or more. The amount of these silane coupling agents added is usually 0.01 to 5 parts by mass per 100 parts by mass of the reactive polymer.

Similarly, an epoxy group-containing compound can be added for the purpose of improving adhesiveness. Epoxy group-containing compounds include: triglycidyl tris (2-hydroxyethyl) isocyanurate; neopentyl glycol diglycidyl ether; 1,6 hexanediglycidyl ether; acrylic glycidyl ether; 2-ethylhexyl glycidyl ether Phenyl glycidyl ether; ρ-tert-butyl glycidyl ether; adipic acid diglycidyl ester; o phthalic acid diglycidyl ester; glycidyl metatalylate; butyl daricidyl ether and the like. Further, the same effect can be obtained by adding an oligomer having an epoxy group with a molecular weight of several hundred to several thousand and a polymer with a weight average molecular weight of several thousand or several hundred thousand. The addition amount of these epoxy group-containing compounds is 0.1 to 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 alone or They can be mixed and added.

[0060] Further, as another additive, hydrocarbon resin can be added for the purpose of improving processability such as processability and bonding. In this case, the added hydrocarbon resin may be either natural or synthetic resin. In the case of natural rosin, rosin, rosin derivatives, and terbene-based rosin are preferably used. In the case of rosin, gum-based resin, tall oil-based resin, and wood-based resin can be used. As the rosin derivative, rosin obtained by hydrogenation, heterogeneity, polymerization, esterification, or metal salt can be used. For terpene resin, terpene phenol resin such as α-vinene and 13 pinene can be used. In addition, dammar, corbal and shellac can be used as other natural fats and oils. On the other hand, petroleum resin, phenol resin, and xylene resin are preferably used in the synthetic resin system. For petroleum-based resins, aliphatic petroleum resins, aromatic petroleum resins, alicyclic petroleum resins, copolymerized petroleum resins, hydrogenated petroleum resins, pure monomer-based petroleum resins Fat and coumarone indene rosin can be used. For phenolic resin, alkylphenolic resin and modified phenolic resin can be used. In the case of xylene-based resin, xylene resin and modified xylene resin can be used.

[0061] Acrylic resin may also be added. For example, alkyl acrylate (eg, methyl acrylate, ethyl acrylate, butyl acrylate) and Z or alkyl methacrylate (eg, methyl methacrylate, ethyl methacrylate, butyl methacrylate) Homopolymers or copolymers that can be used. Moreover, the copolymer of these monomers and another copolymerizable monomer can also be mentioned. In particular, polymethylmetatalate (PMMA) is preferable in terms of reactivity during photocuring, durability after curing, and transparency.

[0062] The addition amount of the polymer such as the hydrocarbon resin is appropriately selected, but is preferably 1 to 20 parts by mass, more preferably 5 to 15 parts by mass with respect to 100 parts by mass of the reactive polymer.

[0063] 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. In some cases, it may contain a small amount of additives such as silica gel, calcium carbonate, and fine particles of silicon copolymer.

[0064] As one preferred embodiment, the photopolymerizable compound contained in the photocurable composition has a functional group having active hydrogen, and at the same time, has an active hydrogen in the photocurable composition. It is preferable to include a compound having at least two groups reactive with the functional group. When such a photocurable composition is used as a material, during processing or storage of a sheet having a transfer layer, they react with each other and slightly crosslink to increase the viscosity of the transfer layer. Let Thereby, the seepage of the transfer layer and the variation in the layer thickness can be largely suppressed.

[0065] 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-ethyl hexyl acrylate). ) And Z or alkyl methacrylates (eg, methyl methacrylate, ethyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate) or homopolymers (ie acrylic resins) And having a photopolymerizable functional group and a functional group having active hydrogen in the main chain or side chain. Therefore, such reactive compounds (reactive polymers) are More than one kind of (meth) acrylate and (meth) acrylate (eg, 2-hydroxyethyl (meth) acrylate) having a functional group such as a hydroxyl group are copolymerized. It can be obtained by reacting with a functional group of a polymer and a compound having a photopolymerizable group such as anatoalkyl (meth) acrylate. At that time, the reactive polymer having a hydroxyl group and a photopolymerizable functional group as a functional group having an active hydrogen can be obtained by adjusting the amount of isocyanatoalkyl (meth) acrylate so that the hydroxyl group remains. can get.

[0066] Alternatively, the functional group having active hydrogen can be obtained by using (meth) acrylate (eg, 2-aminoethyl (meth) acrylate) having an amino group instead of a hydroxyl group as described above. Thus, a photopolymerizable functional group-containing reactive polymer having an amino group 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.

[0067] In addition, as described above, the ability to form a photopolymerizable group via a urethane bond using isocyanatoalkyl (meth) acrylate, etc. Form other methods, for example, an acrylic resin containing a carboxylic acid The photopolymerizable group can also be formed by reacting this carboxylic acid with (meth) acrylate (eg, glycidyl (meth) acrylate) having an epoxy group.

[0068] An acrylic resin having the photopolymerizable functional group via a urethane bond is particularly preferable.

[0069] Examples of the compound having at least two groups reactive with the functional group having active hydrogen include isocyanate compounds, epoxy compounds, and the like. The isocyanate compound is preferred because it is easy to use.

[0070] The at least difunctional isocyanate compounds include tolylene diisocyanate (TDI), isophorone diisocyanate, xylylene diisocyanate, diphenylenomethane 4, 4 diisocyanate, dicyclopentaninoresiisoiso. Examples include cyanate, hexamethylene diisocyanate, 2,4,4'-trimethylhexamethylene diisocyanate, and 2,2 ', 4 trimethylhexamethylene diisocyanate. Trifunctional or higher isocyanate isocyanate compounds such as trimethylolpropane TDI adducts can also be used. Of these, the hexamethylene diisocyanate adduct of trimethylolpropane is preferred.

[0071] Compound having at least two groups reactive with the functional group having active hydrogen described above Is preferably contained in the photocurable composition in the range of 0.2 to 4% by mass, particularly 0.2 to 2% by mass. In addition to providing an appropriate cross-linking force S to prevent the transfer layer from exuding, the substrate can also maintain good transferability of the stamper irregularities. The reaction between the above compound and the reactive polymer proceeds gradually after the transfer layer is formed, and reacts at room temperature (generally 25 ° C) for 24 hours. It is considered that the reaction proceeds after the coating solution for forming the transfer layer is prepared and before it 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, heat is applied during the formation of the transfer layer or after winding in the sheet roll state. The reaction may be promoted.

[0072] The photocurable transfer layer is prepared by uniformly mixing a photocurable material composition as described above together with additives as necessary, kneading with an extruder, a roll, etc., and then calendering, roll, T-die. The film can be formed into a predetermined shape by a film forming method such as extrusion or inflation and stacked on a 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 fluorine resin. In this method, coating is performed on a support (long stripping sheet) by a coating method, 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.

[0073] 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 m, 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 greater than 1 000 m, the thickness of the recording medium increases, which may cause problems with storage and assembly of the recording medium, and may further affect light transmission. In order to make the optical information recording medium multi-layered, it is advantageous to make the thickness small within the above-mentioned range.

[0074] Since 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, it can be easily and accurately bonded to the substrate and the stamper. It is possible. In addition, this bonding can be cured at room temperature for 1 to several tens of seconds with light after being temporarily pressure-bonded at 20 to 100 ° C by a simple method such as a pressure roll or simple press. Because of the self-adhesive force unique to this adhesive, it is difficult for the laminate to delaminate, so that it can be handled freely until photocuring.

[0075] When curing a disk-like photocurable transfer layer, many light sources that emit light in the ultraviolet to visible region can be used as the light source, for example, ultra-high pressure, high-pressure, low-pressure mercury lamp, chemical lamp, xenon lamp, halogen lamp. , Mercury halogen lamps, carbon arc lamps, incandescent lamps, laser lights and the like. Irradiation time is not generally determined by the type of lamp and the intensity of the light source, but it is 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.

[0076] As the material of the long release sheet, a transparent organic resin having a glass transition temperature of 50 ° C or more is preferable. Examples of such a material include polyesters such as polyethylene terephthalate, polycyclohexylene terephthalate, and polyethylene naphthalate. Polyamide resin, nylon 46, modified nylon 6T, nylon MXD6, polyamide resin such as polyphthalamide, polyphenylene sulfide, ketone resin such as polythioether sulfone, sulfone such as polysulfone, polyether sulfone Transparent based mainly on organic resin such as polyether-tolyl, polyarylate, polyether imide, polyamide imide, polycarbonate, polymethyl methacrylate, triacetyl cellulose, polystyrene, polybutyl chloride Use a resin substrate Can do. Of these, polycarbonate, polymethylmethaacrylate, polybuluchloride, polystyrene, and polyethylene terephthalate can be suitably used. The thickness is preferably 10 to 200 μm, particularly 20 to LOO μm.

[0077] The photocurable transfer disk sheet of the present invention can be manufactured by the above-described manufacturing method.

Example

[0078] The following examples further illustrate the present invention.

[0079] [Example 1]

(Production of polymer 1)

Polymer blend 1

Methyl metatalylate 74.6 parts by mass n-Butylmetatalylate 13.2 parts by mass

2-hydroxyethyl methacrylate: 12.1 parts by weight

AIBN 1.2 parts by mass

70 parts by mass of toluene

Ethyl acetate 30 parts by mass

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

[0080] The obtained polymer 1 had a Tg of 100 ° C and a weight average molecular weight of 110000.

[0081] Composition formulation 1

Polymer solution 1 100 parts by mass

110 parts by mass of hexanediol ditalate (KS—HDDA)

Diisocyanate (BXX5627, manufactured by Toyo Ink Manufacturing Co., Ltd.) 1 part by mass

Irgacure 651 (Ciba Geigy Co., Ltd.) 1 part by mass

Hydroquinone monomethyl ether (MEHQ) 0.05 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 the release film prepared as the first long release sheet (width 200mm, length 300m, thickness 50m; product name No. 23, manufactured by Fujimori Kogyo Co., Ltd.) A photocurable transfer layer having a dry thickness of 20 people and 2 m was formed. A release film (width 200 mm, length 300 m, thickness 38 m; product name No. 33, manufactured by Fujimori Kogyo Co., Ltd.) prepared as the second long release sheet was attached to the opposite side of the sheet. . These operations were performed continuously under conveyance.

[0083] <Production 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 Industrial Co., Ltd.). For punching, a photo-curable transfer material sheet flowing at a line speed of 5 mZmin is formed from an elliptical inner blade concentrically provided on the roll surface of the die roll from the side of the first long release sheet (in Formula I, r = l lmm, a = l. 01) and outer blade R = 60mm, a = l.05). The height of the outer blade was 38 / zm lower than the height of the inner blade. Punching was performed so that the centers of the concentric circles were located at the center in the width direction of the photocurable transfer material sheet at intervals of 125 mm in the longitudinal direction. The line speed was finely adjusted so that a shape close to a perfect circle was obtained by performing trial punching several times while changing the speed. The inner circle is punched in such a way that all three layers of the first long release sheet, the photocurable transfer layer and the second long release sheet are punched out (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 (nof cut, partial cut) . The inner part of the fully cut inner circle was completely removed as a residue part, and the peripheral part of the half cut outer circle was also removed as a residue part. In this way, a laminate of the disc-like photocurable transfer layer and the disc-like release sheet provided thereon is provided in the longitudinal direction in the region of the central portion in the width direction on the surface of the long release sheet. The transferable disc sheet was prepared by rotary die cutting using an elliptical blade.

[0084] [Comparative Example 1]

A photocurable transfer material sheet was produced in the same manner as in Example 1.

[0085] <Production of photocurable transfer disk sheet>

The produced photocurable transfer material sheet was subjected to a disk-like punching process using a Thomson blade (manufactured by Tsukaya Blade Co., Ltd.). The punching process was performed by cutting the same photocurable transfer material sheet as in Example 1 to prepare a single wafer sheet (width 200 mm, length 600 mm). As in Example 1 above, from the side of the first long release sheet, the inner and outer circles are concentric with a circular inner blade (diameter 22 mm) and a circular outer blade (diameter 120 mm). This was done by punching into The height of the outer blade was 38 m lower than the height of the inner blade. In the same manner as in Example 1, punching was performed so that the centers of the concentric circles were located at the center in the width direction of the photocurable transfer material sheet at intervals of 125 mm in the longitudinal direction. In the same manner as in Example 1, the inner circle was punched by full cut (full punching), and the outer circle was punched by half cut (partial punching). The generated residue was removed in the same manner as in Example 1. Thus, long stripping A photocurable transfer disk sheet in which a laminate of a disk-shaped photocurable transfer layer and a disk-shaped release sheet provided thereon is provided in the longitudinal direction in a region in the center in the width direction of the surface of the sheet. Was made by sequential punching using a Thomson blade.

[0086] [Comparative Example 2]

[0087] Using the die roll machine SRD-W350 (manufactured by Soltec Kogyo Co., Ltd.), the produced photocurable transfer material sheet was subjected to disk-like punching by rotary die cutting in the same manner as in Example 1. went. However, unlike Example 1, circular inner blades (diameter 22 mm) and outer blades (diameter 120 mm) were used instead of elliptical shapes. Also, fine adjustment of the line speed by trial punching at different speeds was not performed. In this way, in the region of the central portion in the width direction of the surface of the long release sheet, a photocuring formed by laminating the disc-like photocurable transfer layer and the disc-like release sheet provided thereon in the longitudinal direction. The transferable disc sheet was prepared by rotary die cutting using a circular blade.

[0088] [Evaluation method and results]

With respect to the disks on the photocurable transfer disk sheets produced in Example 1, Comparative Example 1 and Comparative Example 2, the appearance accuracy of the punched section, the height accuracy of the punching, and the roundness accuracy of the punching were evaluated. The evaluation was performed as follows by observation under an optical microscope equipped with an xy stage.

[0089] Evaluation of Appearance Accuracy of Stamped Cross Section: The cross section in a state where the laminate of the photocurable transfer disk was crushed and the photocurable material protruded from the laminate was evaluated as X, and the photocurable transfer disk was evaluated. The cross-section in a state where the laminated body was cut while maintaining the laminated structure without being crushed was evaluated as ◯.

[0090] Evaluation of punching height accuracy: The intended punching depth is achieved, the inner circle punching becomes full cut (full punching), and the outer circle punching is half cut (partial punching). The height accuracy is evaluated as ◯, and the punching depth varies, and the strength resulting from the desired half cut and full cut is evaluated as the height accuracy is X. did.

[0091] Evaluation of roundness accuracy of punching: The circumference of a disk punched as an outer circle by an outer blade, and For each circumference of the inner hole of the disk punched out as an inner circle by the inner and outer blades, the conveyance direction (X-axis direction) of the photocurable transfer material sheet, the axial direction of the roll (y-axis direction), and The length of the diameter in two directions was measured under an optical microscope. Then, in either the outer circle or the inner circle, if the length of the diameter in the X-axis direction differs by 1% or more with respect to the diameter in the y-axis direction, The roundness accuracy was evaluated as X. In both the outer circle and the inner circle, if the length of the diameter in the X-axis direction with respect to the y-axis direction is less than 1%, the roundness accuracy of punching was evaluated as ◯, assuming that the shape was close to a perfect circle. .

[0092] The evaluations obtained are shown in the following table.

[0093] [Table 1]

Appearance of cross section

Example 1 ○ o o Comparative example 1 X X ○

Comparative Example 2 O O X

[0094] The disk on the photocurable transfer disk sheet of Example 1 has the laminated structure maintained in its cross section, the full cut and the half cut are performed as desired, and a plane that is extremely close to a perfect circle. It had a shape. In contrast, the disk of Comparative Example 1 obtained a state close to a perfect circle as a planar shape, but the cross-sectional laminate structure was crushed during cutting, and a photocurable material protruded from the cut surface. In some cases, full cuts and half cuts that did not have the same punching depth were not formed as desired. In addition, the disk of Comparative Example 2 has a cross-sectional laminated structure, and full cut and half cut were performed as desired, but the planar shape is close to an ellipse far from a perfect circle. [0095] That is, punching with a Thomson blade has a problem in holding the laminated body of the cross section and punching height accuracy, and rotary die cutting with a circular punching blade has a problem in roundness accuracy. In the method using the rotary die cutting with the punching blade, it was proved that excellent punching was possible for all of them.

Industrial applicability

The photocurable transfer disc sheet obtained by the production method of the present invention is provided with a disc-shaped laminate having high thickness accuracy, uniformity, and roundness accuracy required for optical information recording media such as DVDs. Therefore, the manufacturing method of the present invention is particularly suitable for manufacturing a high-precision optical information recording medium.

Claims

The scope of the claims

[1] A photocuring transfer material sheet is rotated by pressing a tool having a punching blade protruding from the surface onto the surface of the photocurable transfer material sheet under conveyance in synchronization with the conveyance. A method of manufacturing a photo-curable transfer disc sheet by punching a disc into a disc shape,

The manufacturing method characterized in that the shape of the cutting edge of the punching blade in a plan development view of the surface of the roll has an elliptical shape that is long in the conveyance direction of the photocurable transfer material sheet.

[2] The elliptical shape is represented by the following formula I:

2/2, 2 2

X / p + y = r

p Xr is the major axis radius of the ellipse, and

ρ> 1)

The manufacturing method according to claim 1, which has an elliptical shape represented by:

[3] The manufacturing method according to claim 2, wherein the p is in a range of 1.1≥ρ> 1.

[4] The punching blade in which the shape of the cutting edge of the punching blade in the plan development view of the surface of the roll is an elliptical shape represented by the above formula I is:

The oval shape

r = r and p = p (where 1. l≥p> 1)

An inner blade that is

The oval shape

r = r and p = p (where 1. l≥p> 1)

b b b

Is the following conditions:

r r

b a

The manufacturing method according to claim 2, wherein the two ellipses are arranged so that the centers of the two ellipses are the same.

[5] The manufacturing method according to claim 4, wherein the relation of p and force p≥p is satisfied.

aba

[6] The p-force is in the range of 1.04≥p> 1.00, and

a a

The b b according to claim 4 or claim 5, which is in the range of p 1S 1.10≥p≥1.04

The manufacturing method according to claim.

[7] The following steps:

The shape of the cutting edge of the inner circle punching blade in a plan view and the shape of the cutting edge of the outer circle punching blade in a plan view are both in the plane development view of the surface of the roll. The manufacturing method is characterized by having an elliptical shape that is long in the conveying direction of the two and being arranged so that the centers of the two ellipses are the same.

[8] The conveyance speed of the photocurable transfer material sheet is increased or decreased so that an ellipse punched by the punching blade becomes a perfect circle without being subjected to tension force due to conveyance.

7. The manufacturing method according to any one of claims.

[9] A photocurable transfer disk sheet produced by the production method according to any one of claims 1 to 8.