摘要:
An adhesive sheet is provided having adhesive layers on both surfaces of a substrate wherein the adhesive layers on both surfaces are asymmetric chemically, physically and/or geometrically. The adhesive sheet is useful in multilayer printed circuit boards.
摘要:
A composite sheet for use in a printed circuit board, which comprises a sheet of fully densified polytetrafluoroethylene having polyimide resin particles distributed therein, said particles comprising 30 to 80 weight percent of the sheet.
摘要:
A composite sheet for use in a printed circuit board, which comprises a sheet of fully densified polytetrafluoroethylene having polyimide resin particles distributed therein, said particles comprising 30 to 80 weight percent of the sheet.
摘要:
A process is provided for manufacturing a composite of a sheet of expanded, porous polytetrafluoroethylene (PTFE) impregnated with another resin, the other resin being impregnated within the pores of the expanded PTFE. The other resin imparts desired characteristics to the composite such as high thermal resistance and low dielectric constant which make it useful as substrates for printed circuit boards. The composite is useful as a dielectric generally and as an adhesive.
摘要:
A resin-sealed semiconductor device, including a chip mounting die pad (11), gold lead wires (14) and a sealing (13) containing porous fluororesin (15) and surrounding the other components, wherein any water vapor generated by the heat of soldering will be held within the porous fluororesin (15) rather than crack the sealant (13) under internal pressure.
摘要:
A semiconductor device comprising a substrate (3), an optionally thermosetting resin coated or impregnated porous PTFE layer (5) on the substrate separating the substrate from an integrated circuit chip (1). The PTFE layer eliminates thermal and mechanical stress and cracking.
摘要:
An improved electrical integrated circuit (4) mounting is provided, the improvement being a film carrier comprising an electrical conductor (1) laminated to an insulating base film (3), in which the base film contains at least one porous resin sheet (9). The preferred porous resin is porous, expanded polytetrafluoroethylene.