ULTRAVIOLET-CURABLE COMPOSITION FOR OPTICAL DISC AND OPTICAL DISC,申请号EP20090842168-传众专利搜索

ULTRAVIOLET-CURABLE COMPOSITION FOR OPTICAL DISC AND OPTICAL DISC

申请公布号：EP2413317(A1)

申请号：EP20090842168

申请日期：2009.09.02

申请公布日期：2012.02.01

申请人：

DIC CORPORATION

发明人：OSHIO, ATSUSHI;YAMAGUCHI, JUNJI;ITO, DAISUKE

分类号：G11B7/254;C08G18/67;G02B1/04;G11B7/24;G11B7/257

主分类号：G11B7/254

摘要：<p>As for an ultraviolet curable composition according to the present invention, a coating film having been cured with ultraviolet rays has a large number of crosslinking points due to a (meth)acrylate compound that does not intramolecularly have a cyclic moiety and has a functionality of three or more and, since the compound does not intramolecularly have a cyclic moiety, plastic deformation due to a cyclic moiety is less likely to occur. In addition, a monofunctional (meth)acrylate compound that forms a homopolymer having a glass transition temperature of 20°C or less has a low glass transition temperature and is flexible. Accordingly, curing contraction caused in ultraviolet curing can be suppressed and plastic deformation is less likely to occur in the resultant cured film in a temperature range of room temperature or more. Thus, in an optical disc employing, as a light transmitting layer, a cured product of an ultraviolet curable resin composition according to the present invention, warpage is less likely to occur; and recovery from deformation caused even by application of a load for a long period of time or as a result of an impact due to falling or the like is rapidly achieved. Accordingly, errors of reproduced signals are less likely to increase and recovery from the errors is achieved over time; and, as a result, signal reproduction can be appropriately achieved.</p>