Glass fiber of low permittivity
AssigneesNitto Boseki Co., Ltd., Nitto Glass Fiber Mfg. Co., Ltd.
InventorsShinichi Tamura, Masahiro Mori
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Abstract
A low-dielectric-constant glass fiber having a glass composition comprising, by % by weight, 45 to 60% of SiO2, 8 to 20% of Al2O3, 15 to 30% of B2O3, 0 to 5% of MgO, 5%, exclusive of 5%, to 12% of CaO, 0 to 1.0% of Li2O+Na2O+K2O, 0.5 to 5% of TiO2 and 0 to 2% of F2 is suitable for use for reinforcing a high-density printed wiring board required to have a low dielectric tangent and its peripheral members.
Claims5
A low dielectric-constant glass fiber having a glass composition consisting essentially of, by % weight, 45 to 60% of SiO2, 8 to 20% of Al2O3, 15 to 30% of B2O3, 0 to 5% of MgO, 5%, exclusive of 5%, to 12% of CaO, 0 to 1.0% of Li2O+Na2O+K2O, 1.0 to 5% of TiO2 and 0 to 2% of F2, wherein said glass fiber has a dielectric tangent of no more than 9.0×10−4.
Dependencies are inferred from the claim text.