| 摘要 |
A curable resin composition for optical waveguide comprising, as essential components, a carboxyl group-containing urethane compound (A), a polymerizable unsaturated compound (B), a compound (C) containing two or more ring-opening polymerizable functional groups in the molecule, and, a radiation polymerization initiator (D); and, a method for forming an optical waveguide comprising, laminating a dry film composed of a thermosetting resin composition on the surface of a lower clad layer (I) and a core part (II) by heating, and curing this to form an upper clad layer (III), wherein Tg of the dry film is lower by 10� C. or more than Tg of the cured resin forming the core part (II), and the laminating temperature of the dry film is higher by 10� C. or more than Tg of the dry film, are disclosed. |
