GLASS FILLER, PRODUCTION METHOD THEREFOR, AND RESIN-CONTAINING COMPOSITION COMPRISING GLASS FILLER

摘要

Provided is a novel glass filler having low permittivity. The provided glass filler comprises a glass composition, and the glass composition comprises, expressed in weight percentage: 95 ≤ SiO₂ ≤ 99.5; 0 ≤ B₂O₃ ≤ 2; 0.01 ≤ Al₂O₃ ≤ 4; 0 ≤ R₂O ≤ 4; 0.01 ≤ RO ≤ 4; and 0 ≤ TiO₂ ≤ 4. RO is at least one of MgO, CaO and SrO and ZnO, and R₂O is at least one of Li₂O, Na₂O and K₂O. This glass filler can have a permittivity of less than 4 at 1 GHz.