| 摘要 |
PURPOSE: To lower dielectric constant and dielectric loss and improve the productivity, workability and water resistance by specifying the amounts of SiO2 , TiO2 and alkali metal oxide in the composition of a glass fiber. CONSTITUTION: A glass fiber having a dielectric constant of <=4.5 and a dielectric tangent of <=10×10<-4> at 1MHz frequency at room temperature is produced by using a composition preferably containing 50-56wt.% of SiO2 , 14-18wt.% of Al2 O3 , 24-28wt.% of B2 O3 , 0-2.5wt.% of CaO, 0-2.5wt.% of MgO and 1-4wt.% of TiO2 to improve the meltability of the glass and incorporating 0-0.15wt.% of Li2 O, 0-0.15wt.% of Na2 O and 0-0.15wt.% of K2 O to lower the dielectric constant, etc. The above amount of Al2 O3 is required to get improved water resistance and spinnability, that of B2 O3 to get optimum dielectric tangent and water resistance and those of CaO and MgO to improve the water resistance. The composition can be incorporated with ZrO2 , F2 , SO3 , etc., in an amount of <=3% so as not to deteriorate the characteristics of the glass. A batch compounded to obtain the above composition is melted and the obtained glass cullet is melted and spun by a fiber-producing furnace.
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