Back to results
US 5,024,975 AGranted
Crystallizable, low dielectric constant, low dielectric loss composition
AssigneeE. I. Du Pont de Nemours and Company
InventorHans S. Hartmann
Life of this patent
Estimating the term…
Abstract
A variable TCE composition for making dielectric layers having low dielectric constant and low dielectric loss, the composition comprising an admixture of finely divided solids comprising amorphous crystallizable glass, amorphous borosilicate frit, ceramic expansion control additive, and crystallization control additive. The dielectric layers are useful in circuits especially for high density and high frequency applications.
Claims18
A composition for making low K, low dielectric loss dielectric layers, said composition comprising an admixture of finely divided solids comprising:
- (a) 20-80% by weight, basis total solids, amorphous crystallizable glass;
- (b) 20-60% by weight, basis total solids, amorphous borosilicate glass (1) in which the weight ratio of B.sub.2 O.sub.3 to SiO.sub.2 is 0.22-0.55, and (2) containing, basis total borosilicate glass, 0.2-1.0% by weight Al.sub.2 O.sub.3, and 1.5-4.0% by weight of a mixture of oxides of alkali metals, alkaline earth metals or mixtures thereof, at least 0.5-1.2% by weight being Li.sub.2 O;
- (c) 0.1 to 30% by weight, basis total solids, expansion control additive;
- and
- (d) 0.05 to less than 1.0% by weight crystallization control additive.
2 more elements
Dependencies are inferred from the claim text.