Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Including a second component containing structurally defined...
Patent
1988-01-28
1995-02-28
Derrington, James
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Including a second component containing structurally defined...
264 61, 264 63, 156 89, 428336, 428451, 428452, 428446, 428704, 428901, B32B 1800, C04B 3514
Patent
active
053936043
ABSTRACT:
Production of silica "green" tapes employed in fabrication of multilayer circuit boards, by mixing silica powder comprised of spherical substantially uniform particles ranging in size from 0.1 to 2 microns, e.g., 0.7 micron, with a liquid medium containing a vinyl acetate--acrylic copolymer emulsion as binder, polyethylene glycol as plasticizer and dispersant, and preferably also including a small amount of boron, in the form of boric acid or boric oxide. The resulting slip is cast on a substrate, such as a polyester tape and dried to produce a crack-free tape. The resulting silica " green" tape is cut into individual tapes, a predetermined circuit pattern is screened onto each tape, preferably employing gold or copper conductors, and the polyester backing is removed from the tapes. The screened silica "green" tapes are then collated and registered to form a stack of layers, and the layers are laminated under pressure and at elevated temperature into a monolithic unit. Such monolithic unit is then fired at a temperature of the order of about 1050.degree. C. into a multilayer circuit board formed of silica having a low dielectric constant and capable of operating efficiently at high frequencies.
REFERENCES:
patent: 3518756 (1970-07-01), Bennett et al.
patent: 4574063 (1986-03-01), Scherer
patent: 4624934 (1986-11-01), Kokubu
patent: 4766027 (1988-08-01), Burn
patent: 4879261 (1989-11-01), Burn
"Controlled Growth of Monodisperse Silica Spheres in the Micron Size Range", by W. Stober, et al, Journal of Colloid and Interface Science, 26, 62-69 (1968).
Abstract & Translation of Japanese Kokai Patent Pub. No.-054932 Published Mar. 29, 1985.
Volt, Chemical Approach To Glass, Elsevier, Amsterdam 1984, pp. 158-160.
Derrington James
Geldin Max
McDonnell Douglas Corporation
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