Glass fiber forming composition, glass fibers obtained from the

Details Glass fiber forming composition, glass fibers obtained from the Glass fiber forming composition, glass fibers obtained from the

1993-11-08

1995-04-18

Group, Karl

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 38, 501 70, 501 72, G03C 1302

Patent

active

054078725

ABSTRACT:
A glass fiber forming composition exhibits a remarkably high dielectric constant .epsilon..sub..GAMMA. as well as superior chemical resistance, yet it is readily spun into glass fibers. The composition is characterized to show a devitrification temperature which is lower than a spinning temperature at which the glass composition exhibits a viscosity of 10.sup.2.5 poise, so as to be readily spun into corresponding glass fibers. The composition consists essentially of 40 to 65 mol % of SiO.sub.2 ; 20 to 45 mol % of at least one component selected from the group consisting of MgO, CaO, SrO and BaO; 5 to 25 mol % of at least one component selected from the group consisting of TiO.sub.2 and ZrO.sub.2 ; and 0.5 to 15 mol % of NbO.sub.5/2 as calculated from an incorporated amount of Nb.sub.2 O.sub.5. Alternately, the composition consist essentially of 40 to 65 mol % of SiO.sub.2 ; 20 to 45 mol % of at least one component selected from the group consisting of CaO, SrO and BaO; 5 to 25 mol % of at least one component selected from the group consisting of TiO.sub.2 and ZrO.sub.2 ; 0.5 to 15 mol % of NbO.sub.5/2 as calculated from an incorporated amount of Nb.sub.2 O.sub.5 ; and 0.5 to 15 mol % of AlO.sub.3/2 as calculated from an incorporated amount of Al.sub.2 O.sub.3. The composition is also characterized to incorporate at least 85 mol % of a total amount of the oxides and have a dielectric constant [.epsilon..sub..GAMMA. ] of 9 or more at 1 MHz and 25.degree. C.

REFERENCES:
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patent: 4179300 (1979-12-01), Sagara
patent: 4390638 (1983-06-01), Mennemann
patent: 4400473 (1983-08-01), Mennemann
patent: 4830989 (1989-05-01), Trivedi
Patent Abstracts of Japan, vol. 13, No. 461 (C-645) 18 Oct. 1989 & JP-A-01 179 741, Jul. 17, 1989.
World Patents Index Latest, Week 03, Derwent Publications Ltd., AN 90-096954 & JP-A-2 050 834, Feb. 20, 1990.

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