US3966481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fiberizable alkali-resistant E-type glass
Assignee: Turner and Newall Ltd
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Filing: 1975-06-30
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Granted: 1976-06-29
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Expires: 1995-06-30
Abstract
Abstract Glass compositions consisting essentially of an E-glass are modified by incorporation therein of zirconia or of zirconia and titania, preferably in a total amount not exceeding 12%, more preferably not exceeding 8%, by weight of the composition, whereby significant improvement in alkali resistance is achieved.
Inventors
- 👤 Alan W. Atkinson
- 👤 Brian P. Hodgson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:55
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/089; C03C3/091; C03C3/093; C03C13/00; C03C13/001; C03C13/002; C03C3/11; C03C3/112; C03C3/115; C03C3/118
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
137 words
A fiberizable glass composition exhibiting improved alkali resistance consisting essentially, by weight, of SiO.sub.2 46 to 56%
B.sub.2 O.sub.3
7 to 12%
R.sub.2 O.sub.3
12 to 17% (Fe.sub.2 O.sub.3 less than 1%)
CaO 13 to 24%
MgO 0 to 6%
F 0 to 1%
R.sub.2 O less than 1%
ZrO.sub.2 2 to 6%
TiO.sub.2 0 to 6% wherein R 2 O 3 is Al 2 O 3 with less than 1% Fe 2 O 3 and minor amounts of similar oxides, and R 2 O is Li 2 O, Na 2 O, K 2 O or a mixture of at least two thereof, said glass composition having improved alkali resistance compared to a similar composition absent titania and zirconia, wherein CaO plus MgO does not exceed 25%, and ZrO 2 plus TiO 2 does not exceed 8%.
Claim 2
Dependent Claim
137 words
A fiberizable glass composition exhibiting improved alkali resistance consisting essentially, by weight, of SiO.sub.2 46 to 56%
B.sub.2 O.sub.3
7 to 12%
R.sub.2 O.sub.3
12 to 17% (Fe.sub.2 O.sub.3 less than 1%)
CaO 13 to 24%
MgO 0 to 6%
F 0 to 1%
R.sub.2 O less than 1%
ZrO.sub.2 2 to 6%
TiO.sub.2 0 to 6% wherein R 2 O 3 is Al 2 O 3 with less than 1% Fe 2 O 3 and minor amounts of similar oxides, and R 2 O is Li 2 O, Na 2 O, K 2 O or a mixture of at least two thereof, said glass composition having improved alkali resistance compared to a similar composition absent titania and zirconia, wherein CaO plus MgO does not exceed 25%, and ZrO 2 plus TiO 2 does not exceed 8%.
Claim 3
Dependent Claim
26 words
A glass composition according to claim 1, consisting essentially of: SiO 48.70%
Al.sub.2 O.sub.3
13.25%
CaO 15.50%
MgO 4.80%
B.sub.2 O.sub.3
9.75%
TiO.sub.2 4.00%
ZrO.sub.2 4.00%.
Claim 4
Dependent Claim
33 words
A glass composition according to claim 1, consisting essentially of: SiO.sub.2 52.3%
B.sub.2 O.sub.3
7.3%
Al.sub.2 O.sub.3
13.3%
Fe.sub.2 O.sub.3
0.4%
CaO 18.2%
MgO 3.6%
Na.sub.2 O 0.2%
K.sub.2 O 0.7%
ZrO.sub.2 4.0%.
Claim 5
Dependent Claim
33 words
A glass composition according to claim 1 consisting essentially of: SiO.sub.2 51.3%
B.sub.2 O.sub.3
7.0%
Al.sub.2 O.sub.3
13.0%
Fe.sub.2 O.sub.3
0.4%
CaO 17.9%
MgO 3.5%
Na.sub.2 O 0.2%
K.sub.2 O 0.7%
ZrO.sub.2 6.0%.
Claim 6
Dependent Claim
163 words
A process for improving the alkali resistance of a fiberizable glass composition consisting essentially of: SiO.sub.2 46 to 56%
B.sub.2 O.sub.3
7 to 12%
R.sub.2 O.sub.3
12 to 17%
(Fe.sub.2 O.sub.3 less than 1%)
CaO 13 to 24%
MgO 0 to 6%
F 0 to 1%
R.sub.2 O less than 1% comprising adding to said glass composition from 2 to 6% ZrO 2 and optionally from 0 to 6% TiO 2 , the percentages being by weight of the final composition, wherein R 2 O 3 is Al 2 O 3 with less than 1% Fe 2 O 3 and minor amounts of similar oxides, and R 2 O is Li 2 O, Na 2 O, K 2 O or a mixture of at least two thereof, the resulting glass composition exhibiting improved alkali resistance compared to a similar composition absent the titania and/or zirconia, wherein CaO plus MgO does not exceed 25%, and ZrO 2 plus TiO 2 does not exceed 8%.
Claim 7
Dependent Claim
163 words
A process for improving the alkali resistance of a fiberizable glass composition consisting essentially of: SiO.sub.2 46 to 56%
B.sub.2 O.sub.3
7 to 12%
R.sub.2 O.sub.3
12 to 17%
(Fe.sub.2 O.sub.3 less than 1%)
CaO 13 to 24%
MgO 0 to 6%
F 0 to 1%
R.sub.2 O less than 1% comprising adding to said glass composition from 2 to 6% ZrO 2 and optionally from 0 to 6% TiO 2 , the percentages being by weight of the final composition, wherein R 2 O 3 is Al 2 O 3 with less than 1% Fe 2 O 3 and minor amounts of similar oxides, and R 2 O is Li 2 O, Na 2 O, K 2 O or a mixture of at least two thereof, the resulting glass composition exhibiting improved alkali resistance compared to a similar composition absent the titania and/or zirconia, wherein CaO plus MgO does not exceed 25%, and ZrO 2 plus TiO 2 does not exceed 8%.
Claim 8
Dependent Claim
34 words
The process of claim 5 wherein during the addition the B 2 O 3 content of the product is maintained at 7% or more and the R 2 O content is maintained below 1%.
References Cited (Backward Citations)
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Cited
US3413133A
Cited
US3783092A
Cited
US3673049A
Cited
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Cited
US3904423A
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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) | 1979-06-29 | 1979-12-29 | 1980-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-29 | 1983-12-29 | 1984-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-29 | 1987-12-29 | 1988-06-29 | $7700.00 | Window Closed / Lapsed |