| 摘要 |
PURPOSE:To provide the subject composition having specified viscosity, surface tension and hardness of cured coating film and capable of giving a compact disc durable to long-term storage and having high reliability owing to excellent applicability, adhesivity to a substrate and protecting function in high productivity. CONSTITUTION:The objective composition has a viscosity of <=100 cp at 25 deg.C and a surface tension of 20-34 dyne/cm at 23 deg.C and gives a cured coating film having a pencil hardness of >=2H and excellent adhesivity to metallic film and a substrate. Concrete examples of the composition are those containing (A) <=20 pts.wt. of a bisphenol-type epoxy resin (meth)acrylate, (B) 10-40 pts.wt. of a bifunctional (meth)acrylate monomer, (C) 30-80 pts.wt. of a (meth)acrylate monomer having >=3 functionality, (D) 3-15 pts.wt. of a (meth)acrylate monomer having a viscosity of <=10cp at 25 deg.C, (E) 0.1-10 pts.wt. of a photo-polymerization initiator and (F) 0. 01-5 pts.wt. of a monomer of formula 1 [R<1> is H, etc.; R<2> is group of formula II (n is 1-10). etc.]. |
