Overglaze inks
AssigneeRCA Corporation
InventorsAshok N. Prabhu, Kenneth W. Hang
Life of this patent
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Abstract
Improved thick-film overglaze inks useful in constructing multilayer integrated circuits on circuit boards, particularly porcelain-coated metal circuit boards, are provided. The subject inks comprise: a glass consisting of lead oxide, a modifier component consisting of the oxides of cadmium, zinc, barium and antimony and a glass-forming component consisting of aluminum oxide, boron trioxide and silicon dioxide; a suitable organic vehicle and, if desired, a colorant oxide.
Claims6
An overglaze ink suitable for forming a protective film over an electrical circuit structure on a substrate comprising from about 60 to about 90 percent by weight of a glass powder, and from about 8 to about 35 percent by weight of a suitable organic vehicle, said glass powder consisting essentially of:
- (a) from about 58 to about 66 percent by weight of lead oxide;
- (b) from about 12 to about 20 percent by weight of a modifier component consisting of from about 2 to about 6 percent by weight of cadmium oxide, from about 4, to about 8 percent by weight of zinc oxide, from about 0.1 to about 3 percent by weight of barium oxide and from about 0.1 to about 3 percent by weight of antimony trioxide;
- and
- (c) from about 20 to about 27 percent by weight of a glass forming component consisting of from about 0.1 to about 2 percent by weight of aluminum oxide, from about 14 to about 20 percent by weight of boron trioxide and from about 1 to about 7 percent by weight of silicon dioxide.
An overglaze ink in accordance with claim 3 or 5, wherein said glass consists of:
- (a) about 62 percent by weight of lead oxide;
- (b) a modifier component consisting of about 4 percent by weight of cadmium oxide, about 7 percent by weight of zinc oxide, about 1 percent by weight of barium oxide and about 2 percent by weight of antimony trioxide;
- and
- (c) a glass-forming component consisting of about 1 percent by weight of aluminum oxide, about 17 percent by weight of boron trioxide and about 6 percent by weight of silicon dioxide.
Dependencies are inferred from the claim text.