| 摘要 |
A glass composition comprising, based on mole %, 50-67% B2O3; 20-50% MIIO where MII is selected from the group consisting of alkaline earth elements; 2-15% Ln2O3 where Ln is selected from the group consisting of rare earth elements and further comprising, based on mole %, 0-6% MI2O where MI is selected from the group consisting of alkali elements and 0-10% Al2O. The glass composition incorporated into a castable dielectric composition comprising a dispersion of finely divided solids comprising, based on solids: (a) 25-50 wt. % the glass composition; (b) 50-75 wt % refractory oxide; both dispersed in a solution of (c) an organic polymeric binder; and (d) a volatile organic solvent. The castable dielectric composition used in a method of forming a low loss green tape by casting a thin layer of the dispersion onto a flexible substrate and heating the cast layer to remove the volatile organic solvent.
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