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US 2003/0224923 A1Published application
High thermal expansion glass and tape composition
AssigneeE. I. Du Pont de Nemours and Company
InventorsYong Cho, Kenneth Warren Hang
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AssigneeE. I. Du Pont de Nemours and Company
InventorsYong Cho, Kenneth Warren Hang
Estimating the term…
The present invention relates to an alkali-containing magnesium borosilicate glass composition comprising, in mole %, 10-25% SiO2, 10-25% B2O3, 5-10% BaO, 40-65% MgO, 0.5-3% ZrO2, 0.3-3% P2O5, and 0.2-5% M2O where M is selected from the group of alkali elements and mixtures thereof. The invention is further directed to a castable dielectric composition comprising a dispersion of finely divided solids comprising, based on solids: (a) 50-90 wt. % the glass composition as described above; (b) 10-50 wt. % ceramic filler; both dispersed in a solution of (c) an organic polymeric binder; and (d) a volatile organic solvent. The invention is still further directed to the castable dielectric composition described above used in a method of forming a high TCE LTCC green tape by casting a thin layer of the castable dispersion onto a flexible substrate and heating the cast layer to remove the volatile organic.
A glass composition comprising, in mole %, 10-25% SiO2, 10-25% B2O3, 5-10% BaO, 40-65% MgO, 0.5-3% ZrO2, 0.3-3% P2O5, and 0.2-5% M2O where M is selected from the group of alkali elements and mixtures thereof.
The castable dielectric composition of claim 8 wherein the coloring agent is 0.2-3 wt % of the composition.
Dependencies are inferred from the claim text.