A COPPER-FOILED LAMINATED SHEET FOR FLEXIBLE PRINTED CIRCUIT BOARD

摘要

The copper-foiled laminated sheet of the invention is used to prepare a printed circuit sheet having see-throughness after patterning by etching of the copper foil. Different from conventional copper-foiled laminates using an electrolytic copper foil having a surface roughness of 10 or larger, the inventive laminate is prepared using a rolled copper foil having a surface roughness of 1.5 to 5 so that the surface of the adhesive layer, from which the copper foil has been removed by etching, has no undue roughness as a replica of the copper foil surface not to irregularly diffuse the light giving a parallel light-beam transmission of at least 50% and overall light transmission of at least 70% to ensure good see-through visibility.