Patent ID: 8211790
Filing Date: 2012-07-03
Classification: H01L,H05K,Y10T

Abstract:
1. A method of making a multilayered circuitized substrate, said method comprising: providing a p-aramid paper; impregnating said p-aramid paper with a halogen-free, low moisture absorptivity resin including an inorganic filler to form a first thin, fire resistant dielectric layer that meet the flammability performance test specified by UL94-VO standard and not including continuous or semi-continuous fiberglass fibers as part thereof; forming a first circuitized layer on said first thin dielectric layer to form a thin core substrate; and bonding a second thin dielectric layer comprising a composition similar to said composition of said first thin dielectric layer to said thin core substrate to form a UL94-VO multilayered circuitized substrate, in which each of said first and second thin dielectric layers is fire resistant and meet the flammability performance test specified by UL94-VO standard.