US4166747A
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Glass fiber composition
Assignee: PPG Industries Inc
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Filing: 1977-10-13
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Granted: 1979-09-04
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Expires: 1997-10-13
Abstract
Abstract A glass composition suitable for use in manufacturing glass fibers is described which possesses good electrical properties. The glass is characterized by having a boron oxide content below normal glass fiber glass and increased alkaline earth metal oxides with small quantities of magnesium oxide being present. The glasses produced by the composition have acceptable viscosities in the glass fiber making range and exhibit good stability to devitrification. Opacity is not encountered with these glasses as would be expected.
Inventors
- 👤 Homer E. Neely, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:26
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/089; C03C3/091; C03C13/00
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
104 words
A glass fiber of an improved glass composition having a reduced boron content but still maintaining acceptable properties of liquidus temperature, softening point, and tensile strength consisting of 54 to 55 percent SiO 2 , 13 to 14 percent Al 2 O 3 , 22 to 24 percent CaO, 0.2 to 0.5 percent MgO, 5.5 to 6.8 percent B 2 O 3 and 0.7 to 1.4 percent F 2 , and less than 1 percent of each of the other substituents including Fe 2 O 3 , Na 2 O, TiO 2 , K 2 O all percents being by weight of the composition.
Claim 2
Dependent Claim
104 words
A glass fiber of an improved glass composition having a reduced boron content but still maintaining acceptable properties of liquidus temperature, softening point, and tensile strength consisting of 54 to 55 percent SiO 2 , 13 to 14 percent Al 2 O 3 , 22 to 24 percent CaO, 0.2 to 0.5 percent MgO, 5.5 to 6.8 percent B 2 O 3 and 0.7 to 1.4 percent F 2 , and less than 1 percent of each of the other substituents including Fe 2 O 3 , Na 2 O, TiO 2 , K 2 O all percents being by weight of the composition.
Claim 3
Dependent Claim
71 words
A glass fiber of an improved glass composition having a reduced boron content but still maintaining acceptable properties of liquidus temperature, softening point, and tensile strength consisting of the following composition by weight: ______________________________________
SiO.sub.2 54-55
Al.sub.2 O.sub.3
13-14
CaO 22-24
MgO 0.2-0.5
B.sub.2 O.sub.3
5.5-6.8
______________________________________ And less than 1 percent each of other substituents including Fe 2 O 3 , Na 2 O, TiO 2 , K 2 O.
Claim 4
Dependent Claim
71 words
A glass fiber of an improved glass composition having a reduced boron content but still maintaining acceptable properties of liquidus temperature, softening point, and tensile strength consisting of the following composition by weight: ______________________________________
SiO.sub.2 54-55
Al.sub.2 O.sub.3
13-14
CaO 22-24
MgO 0.2-0.5
B.sub.2 O.sub.3
5.5-6.8
______________________________________ And less than 1 percent each of other substituents including Fe 2 O 3 , Na 2 O, TiO 2 , K 2 O.
Claim 5
Dependent Claim
72 words
A glass fiber of an improved glass composition having a reduced boron content but still maintaining acceptable glass properties of liquidus temperature, softening point, and tensile strength consisting of the following composition by weight: ______________________________________
SiO.sub.2 54.2-55
Al.sub.2 O.sub.3
13-14
CaO 22.1-23.2
MgO 0.3-0.4
B.sub.2 O.sub.3
6.5-6.8
______________________________________ And less than 1 percent each of other substituents including Fe 2 O 3 , Na 2 O, TiO 2 , K 2 O.
Claim 6
Dependent Claim
72 words
A glass fiber of an improved glass composition having a reduced boron content but still maintaining acceptable glass properties of liquidus temperature, softening point, and tensile strength consisting of the following composition by weight: ______________________________________
SiO.sub.2 54.2-55
Al.sub.2 O.sub.3
13-14
CaO 22.1-23.2
MgO 0.3-0.4
B.sub.2 O.sub.3
6.5-6.8
______________________________________ And less than 1 percent each of other substituents including Fe 2 O 3 , Na 2 O, TiO 2 , K 2 O.
Claim 7
Dependent Claim
61 words
A glass fiber of an improved glass composition having a reduced boron content but still maintaining acceptable glass properties of liquidus temperature, softening point, and tensile strength consisting of the following composition by weight: ______________________________________
SiO.sub.2 54-55
Al.sub.2 O.sub.3
13-14
CaO 22-24
MgO 0.2-0.5
B.sub.2 O.sub.3
5.5-6.8
Fe.sub.2 O.sub.3
0.1-0.5
Na.sub.2 O 0.1-0.7
TiO.sub.2 0.2-0.8
F.sub.2 0.3-1.4
K.sub.2 O 0.1-0.5
______________________________________
Claim 8
Dependent Claim
61 words
A glass fiber of an improved glass composition having a reduced boron content but still maintaining acceptable glass properties of liquidus temperature, softening point, and tensile strength consisting of the following composition by weight: ______________________________________
SiO.sub.2 54-55
Al.sub.2 O.sub.3
13-14
CaO 22-24
MgO 0.2-0.5
B.sub.2 O.sub.3
5.5-6.8
Fe.sub.2 O.sub.3
0.1-0.5
Na.sub.2 O 0.1-0.7
TiO.sub.2 0.2-0.8
F.sub.2 0.3-1.4
K.sub.2 O 0.1-0.5
______________________________________
Claim 9
Dependent Claim
61 words
A glass fiber of an improved glass composition having a reduced boron content but still maintaining acceptable glass properties of liquidus temperature, softening point, and tensile strength consisting of the following composition by weight: ______________________________________
SiO.sub.2 54-55
Al.sub.2 O.sub.3
13-14
CaO 22.1-23.2
MgO 0.3-0.4
B.sub.2 O.sub.3
6.5-6.8
Fe.sub.2 O.sub.3
0.3
Na.sub.2 O 0.5
TiO.sub.2 0.6
F.sub.2 0.7-1.4
K.sub.2 O 0.2
______________________________________
Claim 10
Dependent Claim
61 words
A glass fiber of an improved glass composition having a reduced boron content but still maintaining acceptable glass properties of liquidus temperature, softening point, and tensile strength consisting of the following composition by weight: ______________________________________
SiO.sub.2 54-55
Al.sub.2 O.sub.3
13-14
CaO 22.1-23.2
MgO 0.3-0.4
B.sub.2 O.sub.3
6.5-6.8
Fe.sub.2 O.sub.3
0.3
Na.sub.2 O 0.5
TiO.sub.2 0.6
F.sub.2 0.7-1.4
K.sub.2 O 0.2
______________________________________
Claim 11
Dependent Claim
126 words
In a glass fiber composition having present silica, Al 2 O 3 CaO, and B 2 O 3 , the improvement of providing an improved glass composition having a reduced boron content but still maintaining acceptable glass properties of liquidus temperature, softening point, and tensile strength consisting of having present silica between 54 to 55 percent, Al 2 O 3 between 13 to 14 percent, CaO between 22 to 24 percent, a B 2 O 3 content of between 5.5 to 6.8 percent, and a MgO content of between 0.2 to 0.5 percent, and less than 1 percent each of other substituents including Fe 2 O 3 , Na 2 O, TiO 2 , and K 2 O all percent being by weight of the composition.
Claim 12
Dependent Claim
126 words
In a glass fiber composition having present silica, Al 2 O 3 CaO, and B 2 O 3 , the improvement of providing an improved glass composition having a reduced boron content but still maintaining acceptable glass properties of liquidus temperature, softening point, and tensile strength consisting of having present silica between 54 to 55 percent, Al 2 O 3 between 13 to 14 percent, CaO between 22 to 24 percent, a B 2 O 3 content of between 5.5 to 6.8 percent, and a MgO content of between 0.2 to 0.5 percent, and less than 1 percent each of other substituents including Fe 2 O 3 , Na 2 O, TiO 2 , and K 2 O all percent being by weight of the composition.
Claim 13
Dependent Claim
131 words
In a glass fiber composition having present silica, Al 2 O 3 , CaO, and B 2 O 3 the improvement of providing an improved glass composition having a reduced boron content but still maintaining acceptable glass properties of liquidus temperature, softening point, and tensile strength consisting of having present therein silica in an amount between 54 to 55 percent, Al 2 O 3 in an amount between 13 to 14 percent, calcium oxide in an amount between 22 to 24 percent, between 6.5 and 6.8 percent B 2 O 3 , and MgO between 0.2 to 0.5 percent, and less than 1 percent each of other substituents including Fe 2 O 3 , Na 2 O, TiO 2 and K 2 O all percents being by weight of the composition.
Claim 14
Dependent Claim
131 words
In a glass fiber composition having present silica, Al 2 O 3 , CaO, and B 2 O 3 the improvement of providing an improved glass composition having a reduced boron content but still maintaining acceptable glass properties of liquidus temperature, softening point, and tensile strength consisting of having present therein silica in an amount between 54 to 55 percent, Al 2 O 3 in an amount between 13 to 14 percent, calcium oxide in an amount between 22 to 24 percent, between 6.5 and 6.8 percent B 2 O 3 , and MgO between 0.2 to 0.5 percent, and less than 1 percent each of other substituents including Fe 2 O 3 , Na 2 O, TiO 2 and K 2 O all percents being by weight of the composition.
Claim 15
Dependent Claim
121 words
In a glass fiber composition having present silica, Al 2 O 3 , CaO, and B 2 O 3 , the improvement of providing an improved glass composition having a reduced boron content but still maintaining acceptable glass properties of liquidus temperature, softening point, and tensile strength consisting of having present silica between 54 to 55 percent, Al 2 O 3 between 13 to 14 percent, CaO between 22 to 24 percent, B 2 O 3 between 6.5 to 6.8 percent and, MgO between 0.3 to 0.4 percent, and less than 1 percent each of other substituents including Fe 2 O 3 , Na 2 O, TiO 2 , and K 2 O, all percents being by weight of the composition.
Claim 16
Dependent Claim
121 words
In a glass fiber composition having present silica, Al 2 O 3 , CaO, and B 2 O 3 , the improvement of providing an improved glass composition having a reduced boron content but still maintaining acceptable glass properties of liquidus temperature, softening point, and tensile strength consisting of having present silica between 54 to 55 percent, Al 2 O 3 between 13 to 14 percent, CaO between 22 to 24 percent, B 2 O 3 between 6.5 to 6.8 percent and, MgO between 0.3 to 0.4 percent, and less than 1 percent each of other substituents including Fe 2 O 3 , Na 2 O, TiO 2 , and K 2 O, all percents being by weight of the composition.
Claim 17
Dependent Claim
18 words
The glass fiber of claim 6 wherein F 2 is present between 0.3 to 1.4 percent by weight.
Claim 18
Dependent Claim
16 words
The glass fiber of claim 7 wherein F 2 is present between 0.3 and 1.4 percent.
Claim 19
Dependent Claim
18 words
The glass fiber of claim 8 wherein F 2 is present between 0.3 and 1.4 percent by weight.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-09-03 | 1983-03-05 | 1983-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-03 | 1987-03-05 | 1987-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-03 | 1991-03-05 | 1991-09-04 | $7700.00 | Window Closed / Lapsed |