Glass composition, glass fiber, glass cloth, and method for producing glass fiber

Abstract

The present disclosure provides a novel glass composition that has a low permittivity and is suitable for mass production. A glass composition provided satisfies, in wt %, for example, 40≤SiO2≤60, 25≤B2O3≤45, 0≤Al2O3≤18, 0<R2O≤5, and 0≤RO≤12, and satisfies at least one of: i) SiO2+B2O3≥80 and SiO2+B2O3+Al2O3≤99.9; and ii) SiO2+B2O3≥78, SiO2+B2O3+Al2O3≤99.9, and 0<RO<10. Another glass composition provided includes SiO2, B2O3, Al2O3, R2O, and 3<RO<8 at the same contents as the above, and satisfies SiO2+B2O3≥75 and SiO2+B2O3+Al2O3<97, where R2O═Li2O+Na2O+K2O and RO═MgO+CaO+SrO.

1 . A glass composition comprising, in wt %:
 40≤SiO 2 ≤60;   30<B 2 O 3 ≤45;   5≤Al 2 O 3 ≤15;   0<R 2 O≤5; and   1≤RO<15, wherein   the glass composition satisfies:   SiO 2 +B 2 O 3 ≥80; and/or   SiO 2 +B 2 O 3 ≥78 and 1≤RO<10; and   0.1≤MgO/(MgO+CaO)≤0.5,   where R 2 O is at least one oxide selected from Li 2 O, Na 2 O, and K 2 O, and RO is at least one oxide selected from MgO, CaO, and SrO.   
     
     
         2 - 3 . (canceled) 
     
     
         4 . A glass composition, satisfying, in wt %, SiO 2 +B 2 O 3 ≥77, wherein
 a permittivity at a frequency of 1 GHz is 4.4 or less, 
 a dielectric loss tangent at a frequency of 1 GHz is 0.007 or less, and 
 a temperature T2 at which a viscosity is 10 2  dPas is 1700° C. or less. 
 
     
     
         5 - 7 . (canceled) 
     
     
         8 . A glass composition comprising, in wt %:
 40≤SiO 2 ≤60;   25≤B 2 O 3 ≤45;   5≤Al 2 O 3 ≤15;   0 21 R 2 O≤5; and   0<RO<15, wherein   the glass composition satisfies:   SiO 2 +B 2 O 3 ≤82; and   SiO 2 +B 2 O 3 +Al 2 O 3 ≤98   where R 2 O is at least one oxide selected from Li 2 O, Na 2 O, and K 2 O, and RO is at least one oxide selected from MgO, CaO, and SrO.   
     
     
         9 . (canceled) 
     
     
         10 . The glass composition according to  claim 4 , comprising, in wt %:
 40≤SiO 2 <58;   25≤B 2 O 3 ≤40;   7.5≤Al 2 O 3 ≤18;   0<R 2 O≤4;   0<Li 2 O≤1.5;   0<Na 2 O≤1.5;   0<K 2 O≤1;   1≤RO<10;   0≤MgO<10;   0≤CaO< 10 ;   0≤SrO≤5; and   0≤T-Fe 2 O 3 ≤0.5,   where R 2 O is at least one oxide selected from Li 2 O, Na 2 O, and K 2 O, RO is at least one oxide selected from MgO, CaO, and SrO, and T-Fe 2 O 3  is total iron oxide calculated as Fe 2 O 3  in the glass composition.   
     
     
         11 - 33 . (canceled) 
     
     
         34 . The glass composition according to  claim 4 , comprising, in wt %, 0.01≤T-Fe 2 O 3 ≤0.5. 
     
     
         35 - 38 . (canceled) 
     
     
         39 . The glass composition according to  claim 4 , being substantially free of BaO and PbO. 
     
     
         40 . The glass composition according to  claim 4 , being substantially free of TiO 2 . 
     
     
         41 . The glass composition according to  claim 4 , comprising, in wt %, 0<TiO 2 ≤1. 
     
     
         42 - 44 . (canceled) 
     
     
         45 . The glass composition according to  claim 4 , wherein
 a permittivity at a frequency of 1 GHz is 4.35 or less, and   a dielectric loss tangent at a frequency of 1 GHz is 0.005 or less.   
     
     
         46 . The glass composition according to  claim 4 , wherein
 a temperature T2 at which a viscosity is 10 2  dPas is 1650° C. or less.   
     
     
         47 . (canceled) 
     
     
         48 . The glass composition according to  claim 4 , wherein
 a temperature T3 at which a viscosity is 10 3  dPas is 1360° C. or less.   
     
     
         49 . The glass composition according to  claim 4 , wherein
 a temperature T3 at which a viscosity is 10 3  dPas is higher than a devitrification temperature TL.   
     
     
         50 - 53 . (canceled) 
     
     
         54 . A glass fiber comprising the glass composition according to  claim 1 . 
     
     
         55 - 59 . (canceled) 
     
     
         60 . A glass cloth comprising the glass fiber according to  claim 54 . 
     
     
         61 - 62 . (canceled) 
     
     
         63 . A prepreg comprising the glass cloth according to  claim 60 . 
     
     
         64 . A printed board comprising the glass cloth according to  claim 60 . 
     
     
         65 . A method for producing a glass fiber, the method comprising melting the glass composition according to  claim 4  at a temperature of 1400° C. or more to obtain a glass fiber having an average fiber diameter of 1 to 6 μm. 
     
     
         66 . The glass composition according to  claim 4 , comprising, in wt %, SnO 2 <0.5. 
     
     
         67 . The glass composition according to  claim 4 , comprising, in wt %, BaO<0.5. 
     
     
         68 . The glass composition according to  claim 4 , comprising, in wt %, 49≤SiO 2 <55. 
     
     
         69 . The glass composition according to  claim 4 , comprising, in wt %, 27≤B 2 O 3 ≤32. 
     
     
         70 . The glass composition according to  claim 4 , comprising, in wt %, 10≤Al 2 O 3 ≤14. 
     
     
         71 . A glass fiber comprising the glass composition according to  claim 4 . 
     
     
         72 . A glass fiber comprising the glass composition according to  claim 8 . 
     
     
         73 . A glass cloth comprising the glass fiber according to  claim 71 . 
     
     
         74 . A glass cloth comprising the glass fiber according to  claim 72 . 
     
     
         75 . A prepreg comprising the glass cloth according to  claim 73 . 
     
     
         76 . A prepreg comprising the glass cloth according to  claim 74 . 
     
     
         77 . A printed board comprising the glass cloth according to  claim 73 . 
     
     
         78 . A printed board comprising the glass cloth according to  claim 74 .