US4140533A
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Alkali resistant glass compositions and alkali resistant glass fibers prepared therefrom
Assignee: Kanebo Ltd
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Filing: 1977-12-02
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Granted: 1979-02-20
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Expires: 1997-12-02
Abstract
Abstract An alkali resistant glass composition comprising the following oxides in a weight percentage composition of 57 - 64% SiO 2 , 19 - 23.5% ZrO 2 , 0.5 - 2.5% Li 2 O, 11 - 18% Na 2 O, 0 - 6% K 2 O, 0 - 0.5% RO, 0 - 0.5% Al 2 O 3 and 0 - 0.5% M x O y wherein R is an alkaline earth metal, M is a metal other than an alkaline earth metal, and x and y are positive integers where (valence of M) multiplied by x = 2y, and satisfying the relationships defined by following expressions (1) and (2): 21 ≧ Na.sub.2 O + Li.sub.2 O + K.sub.2 O≧ 15.5 (1) 52 - 2zr.sub.2 O≧4Li.sub.2 O - K.sub.2 O≧ZrO.sub.2 - 21 (2); and alkali resistant glass fibers prepared therefrom.
Inventors
- 👤 Koichiro Ohtomo
- 👤 Takuji Yoshimura
- 👤 Hiroshi Fujii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:42
CPC Classifications
C; C03; C03C; C03C13/00; C03C13/001; C03C13/002; C03C3/00; C03C3/04; C03C3/076; C03C3/083; C03C3/085; C03C3/087; C03C4/00; C03C4/20
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
115 words
An alkali resistant glass composition consisting essentially of the following oxides, in weight percentages: SiO 2 ; 57 - 64% ZrO 2 ; 19 - 23.5% p1 Li 2 O; 0.5 - 2.5% Na 2 O; 11 - 18% K 2 o; 0.5 - 3% wherein (a) 21 ≧ Na 2 O + Li 2 O + K 2 O ≧ 15.5, and (b) 52 - 2ZrO 2 ≧ 4Li 2 O - K 2 O ≧ ZrO 2 - 21, and said composition having a glass spinning temperature (T F ) ≧ 1310° C. and a difference between the glass spinning temperature (T F ) and the glass liquidus temperature (T) ≧ 50° C.
Claim 2
Dependent Claim
115 words
An alkali resistant glass composition consisting essentially of the following oxides, in weight percentages: SiO 2 ; 57 - 64% ZrO 2 ; 19 - 23.5% p1 Li 2 O; 0.5 - 2.5% Na 2 O; 11 - 18% K 2 o; 0.5 - 3% wherein (a) 21 ≧ Na 2 O + Li 2 O + K 2 O ≧ 15.5, and (b) 52 - 2ZrO 2 ≧ 4Li 2 O - K 2 O ≧ ZrO 2 - 21, and said composition having a glass spinning temperature (T F ) ≧ 1310° C. and a difference between the glass spinning temperature (T F ) and the glass liquidus temperature (T) ≧ 50° C.
Claim 3
Dependent Claim
66 words
The composition of claim 1 which contains the following constituents, in weight precentages: Ro; 0 - 0.5% al 2 O 3 ; 0 - 0.5% M x O y ; 0 -0.5% wherein R is an alkaline earth metal, M is a metal other than the above metal components, and x and y are positive integers and the valence of M multiplied by x equals 2y.
Claim 4
Dependent Claim
18 words
The composition of claim 1 wherein the recited constituents comprise 100 to 98.5% by weight of the composition.
Claim 5
Dependent Claim
18 words
The composition of claim 2 wherein the recited constituents comprise 0 to 1.5% by weight of the composition.
Claim 6
Dependent Claim
46 words
The alkali resistance glass composition of claim 1 wherein said oxides have the following weight percentages: SiO 2 ; 58 - 63% ZrO 2 ; 19 - 23.5% Li 2 O; 1 - 2% Na 2 O; 13 - 17% K 2 o; 0.5 - 3%.
Claim 7
Dependent Claim
46 words
the alkali resistant glass composition of claim 1 wherein said oxides have the following weight percentage: SiO 2 ; 58 - 63% ZrO 2 ; 20 - 22.5% Li 2 O; 1 - 2% Na 2 O; 13 - 17% K 2 o; 0.5 - 2.5%
Claim 8
Dependent Claim
115 words
alkali resistant glass fibers having a composition consisting essentially of the following oxides, in weight percentages: SiO 2 ; 57 - 64% ZrO 2 ; 19 - 23.5% Li 2 O; 0.5 - 2.5% Na 2 O; 11 - 18% K 2 o; 0.5 - 3% wherein (a) 21 ≧ Na 2 O + Li 2 O + K 2 O ≧ 15.5, and (b) 52 - 2ZrO 2 ≧4Li 2 O - K 2 O ≧ ZrO 2 - 21, and said composition having a glass spinning temperature (T F ) ≧ 1310° C. and a difference between the glass spinning temperature (T F ) and the glass liquidus temperature (T) ≧ 50° C.
Claim 9
Dependent Claim
115 words
alkali resistant glass fibers having a composition consisting essentially of the following oxides, in weight percentages: SiO 2 ; 57 - 64% ZrO 2 ; 19 - 23.5% Li 2 O; 0.5 - 2.5% Na 2 O; 11 - 18% K 2 o; 0.5 - 3% wherein (a) 21 ≧ Na 2 O + Li 2 O + K 2 O ≧ 15.5, and (b) 52 - 2ZrO 2 ≧4Li 2 O - K 2 O ≧ ZrO 2 - 21, and said composition having a glass spinning temperature (T F ) ≧ 1310° C. and a difference between the glass spinning temperature (T F ) and the glass liquidus temperature (T) ≧ 50° C.
Claim 10
Dependent Claim
71 words
The glass fibers of claim 7 in which the glass composition contains the following constituents, in weight percentages: Ro; 0 - 0.5% al 2 O 3; 0 - 0.5% M x O y ; 0 - 0.5% wherein R is an alkaline earth metal, M is a metal other than the above metal components, and x and Y are positive integers and the valence of M multiplied by x equals 2y.
Claim 11
Dependent Claim
23 words
The glass fibers of claim 7 wherein the recited constituents of the glass composition comprise 100 to 98.5% by weight of the composition.
Claim 12
Dependent Claim
23 words
The glass fibers of claim 8 wherein the recited constituents of the glass composition comprise 0 to 1.5% by weight of the composition.
Claim 13
Dependent Claim
32 words
The glass fibers of claim 7 wherein the difference between the glass spinning temperature (T F ) and the glass liquidus temperature (T L ) of said glass composition ≧ 60° C.
Claim 14
Dependent Claim
21 words
The glass fibers of claim 7 wherein the glass spinning temperature (T F ) of said glass composition ≧ 1300° C.
Claim 15
Dependent Claim
50 words
The alkali resistant glass fibers of claim 7 wherein said oxides in said glass composition have the following weight percentages: SiO 2 ; 58 - 63% ZrO 2 ; 19 - 23.5% Li 2 O; 1 - 2% Na 2 O; 13 - 17% K 2 o; 0.5 - 3%.
Claim 16
Dependent Claim
50 words
the alkali resistant glass fibers of claim 7 wherein said oxides in said glass composition have the following weight percentages: SiO 2 ; 58 - 63% ZrO 2 ; 20 - 22.5% Li 2 O; 1 - 2% Na 2 O; 13 - 17% K 2 o; 0.5 - 2.5%.
Claim 17
Dependent Claim
86 words
the alkali resistant glass fibers of claim 7 wherein said oxides in said glass composition have the following weight percentage: SiO 2 ; 57 - 64% ZrO 2 ; 19 - 23.5% Li 2 O; 0.5 - 2.5% Na 2 O; 11 - 18% K 2 o; 0.5 - 3% wherein (a) 21 ≧ Na 2 O + Li 2 O + K 2 O ≧ 17, and (b) 52 - 2ZrO 2 ≧ 4Li 2 O - K 2 O ≧ ZrO 2 - 21.
Claim 18
Dependent Claim
15 words
A glass fiber reinforced cement composition comprising cement and the glass fibers of claim 7.
Claim 19
Dependent Claim
35 words
A glass fiber reinforced cement composition of claim 16 wherein the glass fibers have a diameter of 5 to 50 microns and said glass fibers comprise 0.3 - 25% by weight of said cement composition.
Claim 20
Dependent Claim
21 words
A glass fiber reinforced cement composition of claim 17 in which the glass fibers are 1 - 100 millimeters in length.
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) | 1982-02-19 | 1982-08-21 | 1983-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-19 | 1986-08-21 | 1987-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-19 | 1990-08-21 | 1991-02-20 | $7700.00 | Window Closed / Lapsed |