초록 ▼

Embodiments of the present invention relate generally to fiberizable glass compositions comprising boron oxide at least one rare earth oxide in a molar ratio of rare earth oxide to boron oxide ranging from 0.01 to 0.33. Other embodiments of the present invention relate to methods of inhibiting boron

Embodiments of the present invention relate generally to fiberizable glass compositions comprising boron oxide at least one rare earth oxide in a molar ratio of rare earth oxide to boron oxide ranging from 0.01 to 0.33. Other embodiments of the present invention relate to methods of inhibiting boron volatization from glass compositions comprising boron oxide by adding a rare earth oxide to the glass composition before melting the glass compositions. Still other embodiments of the present invention relate to glass fibers formed from the fiberizable glass compositions of the present invention, and polymeric composites and printed circuit boards made therefrom.

대표청구항 ▼

The invention claimed is: 1. A fiberizable glass composition comprising, from 9 to 16 weight percent Al2O3; from 5 to 13 weight percent B2O3; from 16 to 25 weight percent CaO; 0 to 6 weight percent MgO; from 48 to 62 weight percent SiO2; 0 to 4 weight percent TiO2; and R2O3, wherein a molar ratio o

The invention claimed is: 1. A fiberizable glass composition comprising, from 9 to 16 weight percent Al2O3; from 5 to 13 weight percent B2O3; from 16 to 25 weight percent CaO; 0 to 6 weight percent MgO; from 48 to 62 weight percent SiO2; 0 to 4 weight percent TiO2; and R2O3, wherein a molar ratio of R2O3 to B2O3 ranges from 0.01 to 0.33, and R is at least one rare earth element selected from the group consisting of Sc, Y, La, Nd, Sm, Eu, Gd, Er, and Lu. 2. The glass composition of claim 1 wherein the fiberizable glass composition has a log3 forming temperature no greater than 1200�� C.; a liquidus temperature no greater than 1140�� C. and a ΔT of at least 55�� C. 3. The fiberizable glass composition of claim 1 wherein the glass composition comprises from 5 to 10 weight percent B2O3. 4. The fiberizable glass composition of claim 1 wherein the molar ratio of R2O3 to B2O3 ranges from 0.01 to 0.15. 5. The fiberizable glass composition of claim 1 wherein the rare earth element has an oxidation state of 3+ and an ionic potential in glass of at least 2.5. 6. The fiberizable glass composition of claim 1 wherein the fiberizable glass composition comprises a molar ratio of BO3 structural units to a sum of BO3 structural units plus BO4 structural units of at least 0.775. 7. The fiberizable glass composition of claim 1 wherein the glass composition has a relative boron loss of less than 5 percent. 8. The fiberizable glass composition of claim 1 wherein the glass composition has a dielectric constant at 1 MHz of no greater than 7.5. 9. The fiberizable glass composition of claim 1 wherein the glass composition has a dissipation factor at 1 MHz of no greater than 0.01. 10. The fiberizable glass composition of claim 1 further comprising from 0 to 1.0 weight percent Fe2O3; no more than 1 weight percent F2; and 0 to 2 wt. % of at least one alkali metal oxides selected from the group consisting of Na2O, K2O, and Li2O. 11. The fiberizable glass composition of claim 1 comprising, from 12 to 16 weight percent Al2O3; from 5 to 10 weight percent B2O3; from 16 to 25 weight percent CaO; 0 to 4 weight percent MgO; from 52 to 56 weight percent SiO2; 0 to 0.8 weight percent TiO2; and R2O3, wherein a molar ratio of R2O3 to B2O3 ranges from 0.01 to 0.33, and R is at least one rare earth element selected from the group consisting of Sc, Y, La, Nd, Sm, Eu, Gd, Er, and Lu. 12. The fiberizable glass composition of claim 1 wherein R2O3 comprises La2O3. 13. The fiberizable glass composition of claim 1 wherein the MgO content is from 2 to 4 weight percent. 14. The fiberizable glass composition of claim 11 wherein R2O3 comprises Nd2O3. 15. A glass fiber comprising the glass composition of claim 1. 16. A polymeric composite comprising: a polymeric matrix material; and at least one glass fiber in the polymeric matrix material, the at least one glass fiber comprising the glass composition of claim 1. 17. The polymeric composite of claim 16, wherein the polymeric composite is a substrate for an electronic circuit.