摘要:
An ultraviolet-curable composition of the present invention, which is used for a light transmission layer of an optical disk, includes a urethane (meth)acrylate having an isocyanate structure; and at least one of a monofunctional (meth)acrylate and a difunctional (meth)acrylate, wherein the combined amount of the urethane (meth)acrylate, the monofunctional (meth)acrylate and the difunctional (meth)acrylate is at least 90% by mass of the ultraviolet-curable composition. This ultraviolet-curable composition for a light transmission layer is able to realize an optical disk that exhibits excellent durability even under conditions of high temperature and high humidity, minimal decrease in light reflectance, and excellent adhesion between layers.
摘要:
A reusable gravure printing plate or cylinder blank which can be readily processed into a printing plate or cylinder carrying an image to be printed. The blank comprises a non-etchable, wear-resistant layer, as of chromium, overlying at least the surface of a base, and a multiplicity of minute dot-like etchable portions, as of copper, which are of equal size and uniform placement, and which are formed at least in and isolated from each other by the non-etchable layer. The etchable portions are formed flush with the non-etchable layer. For preparation of a gravure printing plate or cylinder from this blank an etching operation is performed on the blank through a prepared etching resist, as with the use of a ferric chloride solution. The etchant forms ink-retaining cells in the etchable portions of the blank.