US3847627A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass compositions, fibers and methods of making same
Assignee: Owens Corning
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Filing: 1973-03-19
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Granted: 1974-11-12
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Expires: 1993-03-19
Abstract
Abstract This disclosure relates to fiberizable glass compositions, fibers and the method of making textile fibers which are boron and fluorine free. Boron and fluorine have now been recognized as potential pollutants in the manufacture of fiberizable glasses and glass fibers and the following disclosure eliminates these pollutants by substituting TiO2, MgO and ZnO in the basic three component glass composition of SiO2, Al2O3 and CaO. The preferred glass composition consists essentially of, by weight, 54.5 to 60% SiO2, 9 to 14.5%Al2O3, 17 to 24% CaO, 2 to 4% TiO2, 1.5 to 4% MgO and 1 to 5.5% RO, wherein RO is an oxide selected from the group consisting of ZnO, SrO and BaO, calculated as ZnO.
Inventors
- 👤 T Erickson
- 👤 W Wolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 12:15
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/083; C03C3/085; C03C3/087; C03C13/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
99 words
A BORON AND FLUORINE FREE FIBERIZABLE GLASS COMPOSITION HAVING A LIQUIDUS TEMPERATURE OF 2,200*F. OR LESS AND HAVING A VISCOSITY OF LOG 2.5 POISES AT 2,450*F OR LESS AND HAVING LESS THAN THE EQUIVALENT OF 1 WEIGHT PERCENT, TOTAL, OF NA2O, K2O AND LI2O, CALCULATED AS NA2O, CONSISTING ESSENTIALLY OF WEIGHT OF 54.5 TO 60% SIO2, 9 TO 14.5% AL2O3, 17 TO 24% CAO, 2 TO 3.5% TIO2, 1.5 TO 4% MGO AND 1 TO 6% RO, WHEREIN R IS SELECTED FROM THE GROUP CONSISTING OF ZN, SR AND BA, AND THE AMOUNT OF RO IS CALCULATED AS ZNO.
Claim 2
Dependent Claim
99 words
A BORON AND FLUORINE FREE FIBERIZABLE GLASS COMPOSITION HAVING A LIQUIDUS TEMPERATURE OF 2,200*F. OR LESS AND HAVING A VISCOSITY OF LOG 2.5 POISES AT 2,450*F OR LESS AND HAVING LESS THAN THE EQUIVALENT OF 1 WEIGHT PERCENT, TOTAL, OF NA2O, K2O AND LI2O, CALCULATED AS NA2O, CONSISTING ESSENTIALLY OF WEIGHT OF 54.5 TO 60% SIO2, 9 TO 14.5% AL2O3, 17 TO 24% CAO, 2 TO 3.5% TIO2, 1.5 TO 4% MGO AND 1 TO 6% RO, WHEREIN R IS SELECTED FROM THE GROUP CONSISTING OF ZN, SR AND BA, AND THE AMOUNT OF RO IS CALCULATED AS ZNO.
Claim 3
Dependent Claim
97 words
A boron and fluorine free fiberizable glass composition, having a liquidus temperature of 2,200* F, or less and having a viscosity of log 2.5 poises at 2,450* F. or less and having less than the equivalent of 1 weight percent, total, of Na2O, K2O and Li2O, calculated as Na2O, consisting essentially of, by weight, 54.5 to 60% SiO2, 9 to 14.5% Al2O3, 17 to 24% CaO, 2 to 4% TiO2, 1.5 to 4% MgO and 1 to 6% RO, wherein RO is an oxide selected from the group consisting of ZnO, SrO and BaO, calculated as ZnO.
Claim 4
Dependent Claim
97 words
A boron and fluorine free fiberizable glass composition, having a liquidus temperature of 2,200* F, or less and having a viscosity of log 2.5 poises at 2,450* F. or less and having less than the equivalent of 1 weight percent, total, of Na2O, K2O and Li2O, calculated as Na2O, consisting essentially of, by weight, 54.5 to 60% SiO2, 9 to 14.5% Al2O3, 17 to 24% CaO, 2 to 4% TiO2, 1.5 to 4% MgO and 1 to 6% RO, wherein RO is an oxide selected from the group consisting of ZnO, SrO and BaO, calculated as ZnO.
Claim 5
Independent Claim
112 words
The method of making a boron and fluorine free textile glass fiber, comprising the steps of melting a glass batch consisting essentially of, by weight, 54.5 to 60% SiO2, 9 to 14% Al2O3, 17 to 24% CaO, 2 to 4% TiO2, 1.5 to 4% MgO and 1 to 6 percent of the oxide RO, wherein RO is selected from the group consisting of ZnO, SrO and BaO, calculated as ZnO in molecular weight percent, reducing the temperature of the molten glass to within the fiberization range having a liquidus temperature of 2,200* F. or less and having a viscosity of log 2.5 poises at 2,450* F. or less and drawing a fiber.
Claim 6
Independent Claim
112 words
The method of making a boron and fluorine free textile glass fiber, comprising the steps of melting a glass batch consisting essentially of, by weight, 54.5 to 60% SiO2, 9 to 14% Al2O3, 17 to 24% CaO, 2 to 4% TiO2, 1.5 to 4% MgO and 1 to 6 percent of the oxide RO, wherein RO is selected from the group consisting of ZnO, SrO and BaO, calculated as ZnO in molecular weight percent, reducing the temperature of the molten glass to within the fiberization range having a liquidus temperature of 2,200* F. or less and having a viscosity of log 2.5 poises at 2,450* F. or less and drawing a fiber.
Claim 7
Dependent Claim
88 words
The method of making a glass fiber defined in claim 3, wherein the glass batch has a liquidus temperature of 2,200* F. or less and a viscosity of log 2.5 poises at 2,450* F. or less, including melting of the glass batch by heating the batch to a temperature of about 2,400* to 2,750* F., above the melting temperature of the batch, and lowering the temperature of the molten glass to a temperature of from about 2,250* to 2,500* F., within the fiberization range of the molten glass.
Claim 8
Dependent Claim
25 words
A boron and fluorine free textile glass fiber having less than one percent, by weight, total alkali metal oxides, calculated as Na2O, consIsting essentially of:
Claim 9
Dependent Claim
25 words
A boron and fluorine free textile glass fiber having less than one percent, by weight, total alkali metal oxides, calculated as Na2O, consIsting essentially of:
Claim 10
Dependent Claim
24 words
The boron and fluorine free textile glass fiber defined in claim 5, having a concentration of TiO2 of less than 3.5 percent by weight.
Claim 11
Dependent Claim
30 words
A fiberizable, boron and fluorine free glass composition, which includes less than 1 percent, by weight, of Na2O, K2O and Li2O, total, calculated as Na2O, consisting essentially of, by weight:
Claim 12
Dependent Claim
30 words
A fiberizable, boron and fluorine free glass composition, which includes less than 1 percent, by weight, of Na2O, K2O and Li2O, total, calculated as Na2O, consisting essentially of, by weight:
Claim 13
Dependent Claim
34 words
The fiberizable, boron and fluorine free glass composition defined in claim 7, wherein said composition includes 0.5 to 2 percent by weight ZrO2 to improve the chemical durability of fibers formed from the glass.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |