| 摘要 |
PURPOSE: To enable writing by a water base pen or ink jet printer on a label surface, to improve printing performance without blotting, spilling, thinning, etc., and to improve the drying property of printing, durability, such as water resistance and adhesion resistance, and productivity by providing the surface of a protective film with a coating layer consisting of a specific compsn. CONSTITUTION: This optical disk has a magnetic disk body 1, the protective film 5 and the coating layer 6 which is disposed on the protective film and is writable with the water base ink. The coating layer 6 is formed by subjecting a coating film contg. a monomer having the group expressed by formula [CF 1] and (meth)acryloy group, a bi- or higher functional (meth)acrylate, polymn. initiator and particulates 12 to radiation curing. In the formula [CF 1], R1 and R2 respectively denote alkyl groups which may be the same or different. L denotes a mere bond or 1 to 3C alkylene group in the straight chain part. |
