Invention Grant
- Patent Title: Optical disc
- Patent Title (中): 光盘
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Application No.: US13255301Application Date: 2009-09-01
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Publication No.: US08703264B2Publication Date: 2014-04-22
- Inventor: Atsushi Oshio , Junji Yamaguchi , Daisuke Ito
- Applicant: Atsushi Oshio , Junji Yamaguchi , Daisuke Ito
- Applicant Address: JP Tokyo
- Assignee: DIC Corporation
- Current Assignee: DIC Corporation
- Current Assignee Address: JP Tokyo
- Agency: McDermott Will & Emery LLP
- Priority: JP2009-057830 20090311
- International Application: PCT/JP2009/004283 WO 20090901
- International Announcement: WO2010/103581 WO 20100916
- Main IPC: B32B3/02
- IPC: B32B3/02 ; G11B7/24

Abstract:
Provided is an optical disc in which at least a light reflecting layer and a light transmitting layer that includes a cured film of an ultraviolet curable composition are stacked on a substrate, and information is reproduced by making a blue laser beam be incident on the optical disc from a side of the light transmitting layer, wherein an elastic modulus (25° C.) measured by indenting a Vickers indenter having a vertex angle of 136° under a load of 100 mN into a surface of the cured film of the ultraviolet curable composition is 1,500 MPa or less; and a loss modulus (E″) at 60° C. in a dynamic viscoelastic spectrum of the cured film measured at a frequency of 3.5 Hz is 10 MPa or less. Thus, warpage is reduced during curing and plastic deformation is less likely even under a load for a long period of time.
Public/Granted literature
- US20120060175A1 OPTICAL DISC Public/Granted day:2012-03-08
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