Patent ID: 8449949
Filing Date: 2013-05-28
Classification: B32B,H05K,Y10T

Abstract:
1. A method for forming a metallized pattern on a printed circuit board substrate, said method comprising: (1) providing a printed circuit board precursor having a insulating substrate comprising a spinel crystal filler and a strippable cover layer; (2) treating the printed circuit board precursor with a laser to i) remove portions of the strippable cover layer and the underlying insulating substrate to form one or more pattern elements on the insulating substrate, wherein said pattern elements are selected from the group consisting of a trough, a via, and combinations thereof and ii) to activate the spinel crystal filler; (3) metallizing the pattern elements on the insulating substrate; and (4) removing over-plating and debris which has been metallized by removal of the strippable cover layer by treatment with a liquid having a ph less than 7.