Ultraviolet-curable composition and optical recording
AssigneeDainippon Ink and Chemicals, Inc.
InventorToshihiro Shoji
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Abstract
The present invention provides an ultraviolet-curable composition having satisfactory protective performance even in endurance testing at high temperature and high humidity in an optical recording medium having for its reflective film Ag or a metal and/or alloy having Ag for its main component, and an optical recording medium in which it is applied. A cured film of an ultraviolet-curable composition, for which the pH value of a 1 wt % methanol solution of said ultraviolet-curable composition is within the range of 4.5 to 6.8, is coated onto a reflective film in the form of a protective film.
Claims4
An ultraviolet-curable composition used for a protective film in an optical recording medium having a recording layer or data recording pits, a reflective film comprised of Ag or a metal and/or alloy having Ag for its main component, and a protective film comprised of a cured film of an ultraviolet-curable composition, in that order, on a substrate;
- wherein the pH value of a 1 wt % methanol solution is within the range of 4.5 to 6.8.
Dependencies are inferred from the claim text.