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Ultraviolet-curable composition for optical disk intermediate layer and optical disk

A technology of ultraviolet light and intermediate layer, which is applied in the direction of coating, optical record carrier, optical record carrier manufacturing, etc., can solve problems such as disc substrate warping, achieve adhesion inhibition, inhibition of crosslinking density increase, and inhibition of curing shrinkage Effect

Inactive Publication Date: 2009-11-25
DIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, these conventional resin compositions use a large amount of polyfunctional acrylates in order to obtain a cured film with a high elastic modulus, so there is a problem that the disc substrate warps due to cure shrinkage during UV curing.

Method used

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  • Ultraviolet-curable composition for optical disk intermediate layer and optical disk
  • Ultraviolet-curable composition for optical disk intermediate layer and optical disk
  • Ultraviolet-curable composition for optical disk intermediate layer and optical disk

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～14 and comparative example 1～7

[0098]

[0099] According to the compounding composition shown in the following Tables 1 to 4 (the numerical values ​​of the composition in the table represent parts by mass), each constituent material was heated at 60°C for 3 hours to melt, and the ultraviolet curing type of each embodiment and each comparative example was prepared. combination.

[0100] Next, each composition of the example and the comparative example was coated on a polycarbonate substrate for an optical disc with a thickness of 1.2 mm and a diameter of 120 mm so that the film thickness became 30 μm, and a cured film was obtained by irradiating ultraviolet rays, and each optical disc for evaluation was prepared. sample. The ultraviolet lamps used were the flash lamp SBC-17 (voltage 1450V, 15 beams) manufactured by Usio Electric Co., Ltd., and the metal halide lamp manufactured by Aigrafitsux Corporation (with a cold mirror, lamp power 120W / cm, cumulative light intensity 0.5J) / cm 2 ).

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Abstract

Disclosed is an ultraviolet-curable composition for optical disk intermediate layers, which contains a urethane (meth)acrylate (a) having three or more radically polymerizable unsaturated bonds, a (meth)acrylate (b) other than the urethane (meth)acrylate (a), which has four or more radically polymerizable unsaturated bonds, and a monofunctional alicyclic (meth)acrylate (c). This composition has a B-type viscosity at 25 DEG C of not more than 1000 mPa*s. This ultraviolet-curable composition is useful for intermediate layers of optical disks, since deformation or lack of a corrugated pattern as well as crack of a disk are hardly caused evenwhen a common low-cost resin such as a polycarbonate is used as a stamper.

Description

technical field [0001] The present invention relates to an ultraviolet curable composition used as an intermediate layer of optical discs 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 generally a structure in which a plurality of information recording layers are laminated via an intermediate layer. Specifically, a first information recording layer is provided on a substrate, and an intermediate layer is formed thereon. 1. An information recording layer has a concavo-convex pattern on the opposite surface; a second information recording layer is laminated thereon, and the concavo-convex pattern of the intermediate layer is transferred ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/257G11B7/24C09D4/02C09D5/00G11B7/254G11B7/26G11B7/24035G11B7/24038G11B7/24056
CPCC08G18/673C08G18/755C09D4/00C08G18/672C09D175/16C08G18/73G11B7/252G11B7/2433G11B7/259G11B7/24038G11B7/246G11B7/2467C08G18/48
Inventor 伊藤大介橘内崇
Owner DIC CORP
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