| abstract |
A laminate for a printed wiring board having a laminate structure comprising an electrical insulator layer (A) and an electrical conductor layer (B) bonded directly to each other, wherein the electrical insulator layer (A) is formed of a fluorocopolymer comprising repeating units (a) based on tetrafluoroethylene and/or chlorotrifluoroethylene, repeating units (b) based on a fluoromonomer excluding tetrafluoroethylene and chlorotrifluoroethylene, and repeating units (c) based on a monomer having an acid anhydride residue and a polymerizable unsaturated bond in amounts of (a) being from 50 to 99.89 mol%, (b) being from 0.1 to 49.99 mol% and (c) being from 0.01 to 5 mol%, based on ((a)+(b)+(c)), and the electrical conductor layer (B) has a surface roughness of at most 10 µm on the side being in contact with the electrical insulator layer (A). The laminate for a printed wiring board is excellent in signal response in a high frequency region. |