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US 5,070,046 AGranted
Dielectric compositions
AssigneeE. I. Du Pont de Nemours and Company
InventorYung-Haw Hu
Life of this patent
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Abstract
A composition for making dielectric layers having low dielectric constant, the composition comprising an admixture of finely divided solids comprising lead-free amorphous borosilicate glass and cordierite glass. The dielectric layers are useful in circuits, especially multilayers circuits for high density applications.
Claims20
A composition for making low K dielectric layers comprising a dispersion of finely divided solids comprising:
- (a) 20-50% by weight, basis total solids, lead-free amorphous borosilicate glass (1) in which the weight ratio of B.sup.2 O.sup.3 to SiO.sup.2 is 0.22-0.55, and (2) containing, basis total borosilicate glass 94.5-98.3% by weight borosilicate, 0.5-1.5% by weight Al.sup.2 O.sup.3, and 1.5-4.0% by weight, of alkali oxides of a mixture of alkali and alkaline earth oxides wherein the Li.sup.2 O content of total solids is 0.3-1.0% by weight;
- (b) 30-80% by weight, basis total solids, cordierite glass;
- and
- (c) 0-40% by weight, basis total solids, of a ceramic filler selected from the group consisting of alumina, quartz, aluminum phosphate, aluminum nitride, boron nitride, fused silica, and mixtures thereof.
1 more element
Dependencies are inferred from the claim text.