| 摘要 |
<p>A glass composition comprising, based on mole %, 50-67% B2O3; 20-50% M< PI >O where M< PI > 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% M<I>2O where M<I> is selected from the group consisting of alkali metal 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.</p> |
