Patent ID: 6881293

Claim:
A process for producing a multi-layer printed wiring board comprising the steps of: providing an internal-layer circuit board having an electrical conductor pattern thereon; providing an inter-laminar adhesive film, which comprises a support film base layer and a layer of a resin composition that is solid at ambient temperature; laminating said inter-laminar adhesive film to the internal-layer circuit board by contacting the surface of the internal-layer circuit board with the resin composition layer under lamination conditions, including a lamination temperature and pressure, thereby adhering the inter-laminar adhesive film to the surface of the internal-layer circuit board; wherein said resin composition comprises: (A) a liquid epoxy resin; (B) a polyfunctional epoxy resin with a softening point higher than the lamination temperature and having two or more epoxy groups per epoxy resin molecule; and (C) a latent epoxy curing agent capable of initiating a reaction at a temperature higher than the lamination temperature.