USRE29388EExpiredUtility
Glass compositions and fibers made therefrom
Priority: Feb 14, 1973Filed: Jan 13, 1977Granted: Sep 6, 1977
Est. expiryFeb 14, 1993(expired)· nominal 20-yr term from priority
C03C 13/002C03C 3/112C03C 3/095C03C 3/04C03C 3/089
21
PatentIndex Score
11
Cited by
14
References
21
Claims
Abstract
Glass compositions, having improved chemical resistance and useful in the form of fibers for reinforcing cementitious materials, consisting essentially of: From 50 to 75 percent by weight Silica From 10 to 25 percent by weight R 2 O from .[.1.]. .Iadd.7 .Iaddend.to 15 percent Titania From 1 to 20 percent by weight Zirconia From 0.8 to 20 percent by weight Rare Earth Oxide From 0 to 20 percent by weight Boric Oxide From 0 to 10 percent by weight R 1 O from 0 to 1 percent by weight Fluorine as (fluoride) From 0 to 2 percent by weight Al 2 O 3 from 0 to 1 percent by weight P 2 O 5 from 0 to 1 percent by weight Chlorine (as chloride) Where R 2 O is sodium oxide, potassium oxide or a mixture of both, optionally including up to 5% by weight of lithium oxide (based on the total composition) and R 1 O is MgO, CaO, BaO, or SrO, or a mixture of two or more thereof.
Claims
exact text as granted — not AI-modifiedI claim:
1. A glass composition, having improved chemical resistance to alkali attack, consisting essentially of: from 50 to 75 percent by weight Silica from 10 to 25 percent by weight R 2 O from .[.1.]. .Iadd.7 .Iaddend.to 15 percent by weight Titania from 1 to 20 percent by weight Zirconia from 0.8 to 20 percent by weight Rare Earth Oxide from 0 to 20 percent by weight Boric Oxide from 0 to 10 percent by weight R 1 O from 0 to 1 percent by weight Fluorine (as fluoride) from 0 to 2 percent by weight Al 2 O 3 from 0 to 1 percent by weight P 2 O 5 from 0 to 1 percent by weight Chlorine (as chloride) wherein R 2 O is selected from the group consisting of Na 2 O, K 2 O, mixtures thereof, and mixtures thereof containing up to 5% by weight lithium oxide (based on the total weight of the composition) and R 1 O is selected from the group consisting of MgO, CaO, BaO, and SrO, and mixtures of two or more thereof.
2. A glass composition according to claim 1, including not more than 30%, by weight of the titania and zirconia together.
3. A glass composition according to claim 1, comprising at least 20% by weight of ZrO 2 and TiO 2 together.
4. A glass composition according to claim 1, comprising at least 23% by weight of ZrO 2 , TiO 2 and rare earth oxide together.
5. A glass composition according to claim 1, including not more than 7% by weight of the R 1 O.
6. A glass composition according to claim 1, wherein any of R 1 O, fluorine Al 2 O 3 , P 2 O 5 or chlorine's present in impurity amounts.
7. A glass composition according to claim 1, containing not more than 15% by weight of zirconia.
8. Glass fiber having a composition as defined in claim 1.
9. Cementitious material, including as reinforcement therein up to 30% by weight of glass fiber as defined in claim 6.
10. A glass composition consisting of: ______________________________________
Silica 50% by weight
Sodium Oxide 10%
Lithium Oxide 1%
Boric Oxide 3%
Titania 10%
Zirconia 10%
Cerium Oxide 15%
Sodium Fluoride 1%
______________________________________
11. A glass composition according to claim 10, in the form of fibers.
12. A glass composition consisting of: ______________________________________
Silica 58% by weight
Sodium Oxide 13%
Titania 9%
Zirconia 12%
Boric Oxide 3%
Ceric Oxide 5%
______________________________________
13. A glass composition according to claim 12, in the form of fibers.
14. A glass composition consisting of: ______________________________________
Silica 56% by weight
Sodium Oxide 12%
Titania 8%
Zirconia 13%
Boric Oxide 3%
Calcium Oxide 6%
Ceric Oxide 2%
______________________________________
15. A glass composition according to claim 14, in the form of fibers.
16. A glass composition consisting essentially of: ______________________________________
Silica 58% by weight
Sodium Oxide 14%
Titania 10%
Zirconia 13%
Boric Oxide 4%
Barium Oxide 0.1%
Mixture of naturally
accuring rare
earth oxides 0.8%
Cl 0.1%
______________________________________
17. A glass composition according to claim 16, in the form of fibers.
18. A glass composition consisting essentially of: ______________________________________
Silica 58% by weight
Sodium Oxide 13%
Titania 7%
Zirconia 14%
Boric Oxide 0.5%
Calcium Oxide 4%
Barium Oxide 0.6%
Mixture of naturally
accurring rare earth
oxides 2.5%
Cl 0.4%
______________________________________
19. A glass composition according to claim 18, in the form of fibres.
20. A glass composition, having improved chemical resistance to alkali attack, consisting essentially of: ______________________________________
from 50-58 percent by weight
Silica
" 11-14 " " " R.sub.2 O
" 8-10 " " " Titania
" 10-14 " " " Zirconia
" 0.8-15 " " " Rare Earth Oxide
" 0.5-4 " " " Boric Oxide
" 0.1-6 " " " R.sup.1 O
" 0-1 " " " Fluorine (as fluoride)
" 0.1-0.4 " " " Chlorine (as chloride)
______________________________________
wherein .[.R20.]. .Iadd.R 2 O .Iaddend.is elected from the group consisting of Na 2 O, K 2 O, mixtures of the two, and mixtures thereof additionally containing up to 1% by weight lithium oxide (based on the total weight of the composition) and R 1 O is selected from the group consisting of MgO, CaO, BaO, SrO and mixtures of two or more thereof.
21. A glass composition according to claim 20, in the form of fibers.Join the waitlist — get patent alerts
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