Base material for the production of printed circuits and process for the preparation of the base material

摘要

A base material for the production of printed circuits according to the additive method includes a laminate base made up of laminated-together core sheets impregnated with hardenable resin, and a cover layer made up of a substrate sheet preimpregnated with phenolic resol resin and provided with an adhesive layer of an elastomeric polymer. The preimpregnated substrate sheet is also provided with a further resin impregnation containing a self-crosslinking copolymer of acrylic monomers and up to 30% by weight of a hardenable phenolic resol resin.