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Ultraviolet hardening composition for optical disk interlayer, optical disk and process for producing optical disk

A manufacturing method, ultraviolet technology, applied in the direction of optical record carrier manufacturing, optical recording/reproduction, non-polymer organic compound adhesives, etc., can solve the problems of concave-convex pattern shape deformation, falling off, insufficient peelability, etc. , to achieve the effect of high elastic modulus and low cost

Inactive Publication Date: 2009-08-05
DIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, when these conventional resin compositions are used for an intermediate layer such as a light-transmitting layer of an optical disc and a general-purpose resin such as polycarbonate is used as a stamper, the releasability thereof is not sufficient, so that there is a problem that the intermediate layer is loose when peeled. A portion remains in the stamper, and deformation or fall-off of the shape of the concave-convex pattern such as pits and groups formed as the intermediate layer is seen

Method used

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  • Ultraviolet hardening composition for optical disk interlayer, optical disk and process for producing optical disk
  • Ultraviolet hardening composition for optical disk interlayer, optical disk and process for producing optical disk
  • Ultraviolet hardening composition for optical disk interlayer, optical disk and process for producing optical disk

Examples

Experimental program
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Embodiment approach

[0135] Hereinafter, as a specific example of the optical disc of the present invention, an example in which a dye recording layer is used as the information recording layer of the above-mentioned structure (i) is shown below.

[0136] As an embodiment of an optical disc using the ultraviolet curable composition for an intermediate layer of an optical disc of the present invention, for example, figure 1 As shown, there is an optical disc having a structure in which pigment recording layers (a 1 ), translucent light reflective layer (t 1 ), the light-transmitting layer (c 1 ), the pigment recording layer (b) and the structure of the light reflection layer (r).

[0137] figure 1 The optical disc is an optical disc with the following structure: the optical disc is on the substrate (d 1 )1 on which the pigment recording layer (a 1 ) 2, translucent light reflection layer (t 1 ) 3. The light-transmitting layer (c) of the ultraviolet curable composition 1 ) 4, pigment recording...

Embodiment

[0159] Next, the present invention will be described in detail with reference to examples, but the present invention is not limited to these examples.

[0160] (Example and Comparative Example)

[0161]

[0162] According to the blending compositions shown in the following Tables 1 to 7 (the blending values ​​in the tables represent parts by mass), each constituent material was heated and dissolved at 60°C for 3 hours to prepare the ultraviolet curable combination of each Example and each Comparative Example. thing.

[0163] Next, on a polycarbonate substrate for optical disks with a thickness of 1.2 mm and a diameter of 120 mm, each composition of the examples and comparative examples was coated so that the film thickness was 30 μm, and a voltage of 1450 V was used using a strobe lamp SBC-17 manufactured by Usio Electric Co., Ltd. 15 ultraviolet rays were irradiated downward to form a cured film, and samples for each optical disc for evaluation were prepared. However, sin...

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Abstract

An ultraviolet hardening composition that forms a multiplicity of crosslinking points by a polyfunctional (meth)acrylate and attains appropriate control of the hardness and crosslink density over the entirety of hardened film by a monofunctional (meth)acrylate and a (meth)acrylate with alicyclic structure, thereby exhibiting an appropriate behavior of detachment at the detachment from a stamper. Further, the detachability of hardened film surface from general-purpose resins can be enhanced by a (meth)acrylate with alicyclic structure and a (meth)acrylate having methyl at its reactive site. By virtue of mixing of a specified amount of any of these (meth)acrylates, the obtained hardened film realizes appropriate detachability from stampers of general-purpose resins while retaining properties, such as heat resistance, advantageous for use as an interlayer of optical disk. Therefore, in the application of this ultraviolet hardening composition to the interlayer of optical disk, disk cracking, uneven pattern deformation and deficiency can be inhibited even at the detachment of stamper.

Description

technical field [0001] The present invention relates to an ultraviolet curable composition used as an intermediate layer of optical disks such as DVD, HD-DVD, and Blu-ray Disc in which a concave-convex pattern is formed. Background technique [0002] In recent years, optical discs having a multilayer structure having a plurality of information recording layers have been widely used in accordance with the demand for larger capacity of optical discs such as DVD, HD-DVD, and Blu-ray Disc. In a multi-layer optical disc, there is usually a structure in which a plurality of information recording layers are laminated through an intermediate layer. Specifically, a substrate has a first information recording layer, and an intermediate layer with a concave-convex pattern is laminated on the surface, and then laminated. In the second information recording layer, the concavo-convex pattern of the intermediate layer is transferred to the second information recording layer. In the format...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/24G11B7/257G11B7/26C09J4/02G11B7/254G11B7/24027G11B7/24035G11B7/24038G11B7/24056
CPCG11B7/24024G11B7/263G11B7/259G11B7/24G11B7/252G11B7/24038G11B2007/24316C09D4/00G11B2007/24312G11B7/2467
Inventor 矶中健伊藤大介
Owner DIC CORP