Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1990-04-30
1992-10-06
McCamish, Marion E.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
428 96, 428137, 428457, 428901, 156668, 361397, 361414, 174250, H05K 100
Patent
active
051530511
ABSTRACT:
A manufacturing process for a multilayer thermoplastic printed circuit substrate (200) begins with a thermoplastic core substrate (202) having a printed circuit pattern (204) on a surface (202A) of the core substrate. Either fully reacted or partially reacted thermoplastic material is dissolved in a suitable dissolving agent and then applied in the liquid state over the surface (202A) of the core substrate. Application is by spraying, dipping, spinning or rolling. This results in a layer of liquid thermoplastic material covering the printed circuit pattern on the core substrate. The dissolving agent is then removed from the thermoplastic layer, leaving behind a uniform, dry hard, dielectric film of thermoplastic resin (206). Using photolithographic techniques, a via (206A) is opened up in the dielectric layer. If the starting material for the dielectric layer was partially reacted thermoplastic resin, the dielectric layer is now fully cured. A second printed circuit pattern (208) is then applied over the dielectric layer and into the via, thereby forming a conductive through-hole, which connects the two printed circuit patterns.
REFERENCES:
patent: 3600330 (1971-08-01), Schneble, Jr. et al.
patent: 4424095 (1984-01-01), Frisch et al.
patent: 4670325 (1987-06-01), Bakos
patent: 4783359 (1988-11-01), Fleischer et al.
Dorinski Dale W.
Duda Kathleen
McCamish Marion E.
Motorola Inc.
Nichols Daniel K.
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