OPTICAL DISC HAVING HARD-COAT LAYER TO WHICH SURFACE LUBRICITY IS IMPARTED

摘要

An optical disc of a type where a laser beam is applied to a recording layer through a thin-film cover layer, wherein on the surface of the thin-film cover layer a hard-coat layer is formed of a cured active energy beam curing composition comprising a polymerizable monomer (A), colloidal silica (B), a lubricity imparting agent (C), and an active energy beam polymerization initiator (D). The lubricity imparting agent (C) contains a lubricity imparting agent (C-T) having, in a molecular, a portion (c-1) developing a lubricity, a portion (c-2) excellent in compatibility with a polymerizable monomer, and an active energy beam curing functional group (c-3). The hard-coat layer formed on the thin-film cover layer of the optical disc is excellent in wear-resistance, transparency, and long-term surface lubricity.