| 摘要 |
PURPOSE:To improve durability by specifying the characteristics of a UV-curing resin. CONSTITUTION:The UV-curing resin for a protective film to be formed on a recording film is specified to have <=10% curing shrinkage, <=1.5% water absorption when immersed in water at 25 deg.C for two weeks, and 2-10mum film thickness after curing, and surface hardness of 3B-H pencil hardness. Thereby, peeling or cracks of the recording film caused by expansion or shrinkage of the protective film due to changes in temp. and/or humidity, or caused by contraction stress during curing the resin can prevented and the durability of the medium can be improved. |
