Ultraviolet-curable composition for light-transmitting layer and optical disk

An ultraviolet and light transmission technology, applied in coatings, optical record carriers, optical record carrier manufacturing, etc., can solve the problems of large film warpage, difficult to apply light transmission layer, etc., achieve less scratches, excellent wear resistance , the effect of less deterioration of signal characteristics

Inactive Publication Date: 2010-07-21
DIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when this ultraviolet curable composition is formed into a thick film as the outermost light-transmitting layer of an optical disc, the warpage in a high-temperature and high-humidity environment and the warpage of the film due to changes in the external environment are large, and it is difficult to apply it to light transmission. Floor

Method used

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  • Ultraviolet-curable composition for light-transmitting layer and optical disk
  • Ultraviolet-curable composition for light-transmitting layer and optical disk
  • Ultraviolet-curable composition for light-transmitting layer and optical disk

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0140] Hereinafter, as specific examples of the optical disc of the present invention, examples of specific configurations of a single-layer optical disc and a dual-layer optical disc are shown below.

[0141] Among the optical discs of the present invention, as a preferred embodiment of a single-layer optical disc, for example, figure 1 As shown, a configuration in which a light reflection layer 2 and a light transmission layer 3 are laminated on a substrate 1 , and a blue laser beam is incident from the light transmission layer side to record or reproduce information can be mentioned. Concavity and convexity in the figure schematically represent a recording track (groove). The light-transmitting layer 3 is a layer composed of a cured product of the ultraviolet curable composition of the present invention, and has a thickness in the range of 100±10 μm. The thickness of the substrate 1 is about 1.1 mm, and the light reflection film is a thin film such as silver.

[0142] ...

Embodiment

[0151] Next, although a synthesis example and an Example are given and this invention is demonstrated in detail, this invention is not limited to these Examples. "Parts" in the following examples means "parts by mass".

[0152] Each composition formulated according to the compositions shown in the following Tables 1 to 2 (the numerical values ​​of the compositions in the tables represent parts by mass) was heated at 60° C. for 3 hours and dissolved to prepare the compositions of Examples 1 to 9 and Comparative Examples 1 to 5. The ultraviolet curable composition of each Example and a comparative example. The following evaluation was performed about the obtained composition, and the obtained result is shown in Tables 1-2.

[0153]

[0154] The viscosity at 25° C. was measured for the ultraviolet curable composition using a B-type viscometer (manufactured by Tokyo Keiki Co., Ltd., BM type).

[0155]

[0156] Regarding the ultraviolet curable composition, the transparency o...

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Abstract

Disclosed is an ultraviolet-curable composition containing an epoxy (meth)acrylate, a urethane (meth)acrylate and a silicone compound represented by the following formula (1). (CH3)3Si-O-X-O-Si(CH3)3 (1) (In the formula, X represents a group having a structure wherein n-number of structural units represented by the following formula (2): (wherein R1 represents a divalent group obtained by linking one or more groups selected from alkylene groups having 1-18 carbon atoms and divalent groups having a structure wherein alkylene groups having 2-18 carbon atoms are linked by an ether bond, and R1 may be bonded to Si directly or through an oxygen atom; and R2 represents a hydrogen atom or a methyl group) and m-number of structural units represented by the following formula (3): are linked at random or in blocks. In this connection, n is an integer of 1-15, and n / m is within the range of 1 / 5-1 / 20.) This ultraviolet-curable composition enables to obtain a light-transmitting layer which is suppressed in warping, while having excellent wear resistance.

Description

technical field [0001] The present invention relates to an ultraviolet curable composition useful as a light-transmitting layer of an optical disc; and at least a light-reflecting layer and a light-transmitting layer are formed, and recording is performed by a blue laser having a vibration wavelength in the range of 370nm to 430nm through the light-transmitting layer or reproduced disc. Background technique [0002] In recent years, with the development of information technology and information network, large-capacity information records are frequently transmitted. Along with this, there is a demand for high-density, high-capacity optical discs that can record and reproduce large-capacity images, music, computer data, etc., and a new optical disc structure using a blue laser optical system with a shorter wavelength than DVD has been proposed. Density recording method. [0003] This new type of optical disc is an optical disc with the following structure: a recording layer ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/254C08F290/14G11B7/24G11B7/257G11B7/26G11B7/24056G11B7/2542
CPCC08G18/4854C08G18/672C08F290/064C09D175/16C08F290/148C08G18/4277G11B7/2542C08G77/20C08G18/48C08G18/42C08F220/343C08F222/102C08F220/301C08F220/281
Inventor 橘内崇伊藤大介
Owner DIC CORP
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