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Photocurable transfer sheet, process for producing optical information recording medium using the same, and optical information recording medium

A technology of photocurability and manufacturing method, which is applied in the manufacture of optical record carriers, recording/reproducing by optical methods, and optical record carriers, etc., can solve the problems of large shrinkage, warping and deformation of the medium, and cannot be pasted, and achieves peeling properties. Good, excellent adhesion effect

Inactive Publication Date: 2009-08-12
BRIDGESTONE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This requires complex processes of coating and inversion. In addition, when inverting the substrate and the stamper, there are disadvantages such as air bubbles when the viscous ultraviolet curable resin contacts, and there is a problem that good adhesion cannot be performed.
In addition, there is also a problem that the above-mentioned ultraviolet curable resin shrinks greatly when it is cured, and the deformation such as warping of the obtained medium is obvious.

Method used

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  • Photocurable transfer sheet, process for producing optical information recording medium using the same, and optical information recording medium
  • Photocurable transfer sheet, process for producing optical information recording medium using the same, and optical information recording medium
  • Photocurable transfer sheet, process for producing optical information recording medium using the same, and optical information recording medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0178]

[0179] (Preparation of polymer 1 having a hydroxyl group)

[0180] Polymer Formulation 1

[0181] 74.6 parts by mass of methyl methacrylate

[0182] 13.2 parts by mass of n-butyl methacrylate

[0183] 12.1 parts by mass of 2-hydroxyethyl methacrylate

[0184] AIBN 1.2 parts by mass

[0185] 70 parts by mass of toluene

[0186] 30 parts by mass of ethyl acetate

[0187]The mixture of the above formulation was heated to 70° C. to start polymerization while stirring slowly, and stirred at this temperature for 8 hours to obtain a polymer 1 (acrylic resin) having a hydroxyl group in a side chain. The solid content was adjusted to 36% by mass (polymer solution 1).

[0188] The obtained polymer 1 had a Tg of 91° C. and a weight average molecular weight of 110,000.

[0189] Composition formula 1

[0190] 1 100 parts by mass of polymer solution with hydroxyl

[0191] 100 parts by mass of hexanediol diacrylate (KS-HDDA)

[0192] trimethylolpropane triacrylate

[01...

Embodiment 2

[0202] A photocurable transfer sheet was obtained in the same manner except that the preparation of the composition formulation in Example 1 and the subsequent steps were performed as follows.

[0203] Composition formula 1

[0204] 1 100 parts by mass of polymer solution with hydroxyl

[0205] 110 parts by mass of hexanediol diacrylate (KS-HDDA)

[0206] 2-Hydroxy 3-acryloxypropyl methacrylate

[0207] (G201-P: manufactured by Kyoeisha Chemical Co., Ltd.) 20 parts by mass

[0208] IRGACURE651 (manufactured by Seba Specialty Chemicals Co., Ltd.) 1 part by mass

[0209] Diisocyanate

[0210] (BXX5627, manufactured by Toyo Ink Manufacturing Co., Ltd.) 1 part by mass

[0211] Hydroquinone monomethyl ether (MEHQ) 0.05 parts by mass

[0212] The mixture of the above formulation was uniformly dissolved, kneaded, and coated on the entire surface of a release sheet (width 140 mm, length 300 mm, thickness 75 μm: trade name No. 23 manufactured by Fujimori Industry Co., Ltd.) to fo...

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Abstract

This invention provides a photocurable transfer sheet that is advantageous in the production of an optical information recording medium having a small thickness and a high capacity such as DVDs. The photocurable transfer sheet is such that a transfer sheet obtained by curing the photocurable transfer sheet has excellent adhesion to a reflective layer formed of a silver alloy or the like, the separation of a stamper is easy, and, accordingly, the shape of a concave / convex signal face such as pits can be provided with high accuracy. The photocurable transfer sheet comprises a photocurable transfer layer formed of a pressure deformable photocurable composition. The photocurable transfer sheet is characterized in that the photocurable composition comprises a polymer and a reactive diluent containing a photopolymerizable functional group and the reactive diluent comprises a compound containing at least one hydroxyl group and at least two groups of at least one kind selected from an acryloyl group and a methacryloyl group. There are also provided a process for producing an optical information recording medium using the photocurable transfer sheet and an optical information recording medium.

Description

technical field [0001] The present invention relates to a kind of DVD (Digital Versatile Disc), CD (Compact Disc) and other large-capacity text, sound, moving image and other information recorded and / or recordable as digital signals, its manufacturing method, And a photocurable transfer sheet using them advantageously. Background technique [0002] Audio CDs and CD-ROMs are widely used as optical information recording media with pits formed on the surface as digital signals, but recently, DVDs are recorded with pits formed on both sides that allow both moving images and recording. , as a next-generation recording medium of the CD, attention is drawn and gradually used. In addition, CD-R, CD-RW, DVD-R, DVD-RW, etc. in which pits and grooves are formed and which can also be recorded by users are increasingly used. [0003] In a DVD having recording layers on both sides, for example, two transparent resin substrates having signal pits (signal pits) formed on one side are know...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/26
CPCG11B7/263G11B7/254G11B7/259G11B7/252
Inventor 稻宫隆人北野秀树小坪秀史村山贤治
Owner BRIDGESTONE CORP