Production of silica "green" tape and co-fired silica substrates therefrom

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 5393604
SERIAL NO

07149357

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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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.

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Patent Owner(s)

Patent OwnerAddress
CALIFORNIA STATE UNIVERSITYLONG BEACH FOUNDATION 6300 STATE UNIVERSITY DRIVE SUITE 332 LONG BEACH CA 90815

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Sanchez, Lloyd E Huntington Beach, CA 2 28

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