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US5108957A
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Glass fibers decomposable in a physiological medium
Assignee: Saint Gobain Isover SA France
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Filing: 1990-08-09
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Granted: 1992-04-28
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Expires: 2010-08-09
Abstract
Abstract Glass compositions useful for forming fibers which are readily able to be degraded in a physiological medium such as that found in a human body. Advantageous compositions formed according to the present invention comprise the following components, set forth in percent by weight: SiO2: 57 to 70% Al2O3: 0 to 5% CaO: 5 to 10% MgO: 0 to 5% Na2O+K2O: 13 to 18% B2O3: 2 to 12% F: 0 to 1.5% P2O5: 0 to 4% Impurities: less than 2%
Inventors
- 👤 Isabelle Cohen
- 👤 Sylvie Thelohan
- 👤 Hans Furtak
- 👤 Hartmut Tiesler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:50
CPC Classifications
C; C03; C03C; C03C13/00; C03C3/00; C03C3/04; C03C3/076; C03C3/089; C03C3/097; A; A61; A61F; A61F13/00; A61F13/15; A61F13/15203; A61F13/15252; A61F13/53; A61F2013/530131; A61F2013/530328; C03C2213/00; C03C2213/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
150 words
Glass fiber which is decomposable in a physiological medium, said fiber comprising: SiO 2 : 57 to 70 wt %; CaO: 5 to 10 wt %; Na 2 O+K 2 O: 13 to 18 wt %; B 2 O 3 : 2 to 12 wt %; Al 2 O 3 : up to about 5 wt %; MgO: up to about 5 wt %; F: up to about 1.5 wt %; Impurities: less than 2 wt %; and P 2 O 5 in an amount effective in combination with the B 2 O 3 and, when present, the Al 2 O 3 , but less than about 4 wt. %, to cause the fiber to be decomposable in a physiological midi; wherein said fiber contains more than 0.1% by weight of P 2 O 5 when the percentage by weight of alumina is greater than or equal to about 1%.
Claim 2
Dependent Claim
150 words
Glass fiber which is decomposable in a physiological medium, said fiber comprising: SiO 2 : 57 to 70 wt %; CaO: 5 to 10 wt %; Na 2 O+K 2 O: 13 to 18 wt %; B 2 O 3 : 2 to 12 wt %; Al 2 O 3 : up to about 5 wt %; MgO: up to about 5 wt %; F: up to about 1.5 wt %; Impurities: less than 2 wt %; and P 2 O 5 in an amount effective in combination with the B 2 O 3 and, when present, the Al 2 O 3 , but less than about 4 wt. %, to cause the fiber to be decomposable in a physiological midi; wherein said fiber contains more than 0.1% by weight of P 2 O 5 when the percentage by weight of alumina is greater than or equal to about 1%.
Claim 3
Dependent Claim
33 words
The fiber of claim 1 which comprises at least about 0.5% by weight of P 2 O 5 when the amount of alumina in said fiber is at least about 2% by weight.
Claim 4
Dependent Claim
149 words
Glass fiber which is decomposable in a physiological medium, said fiber comprising: SiO 2 : 59 to 68 wt %; CaO: 6 to 9 wt %; MgO: 2 to 4 wt %; Na 2 O: 14 to 17 wt %; Al 2 O 3 : up to about 3 wt %; K 2 O: up to about 2 wt %; F: up to about 1.5 wt %; B 2 O 3 : 4 to 11 wt %; and P 2 O 5 in an amount effective in combination with the B 2 O 3 and, when present, the Al 2 O 3 but less than about 4 wt., % to cause the fiber to be decomposable in a physiological medium, wherein said fiber contains more than 0.1% by weight of P 2 O 5 when the percentage by weight of alumina is greater than or equal to about 1%.
Claim 5
Dependent Claim
149 words
Glass fiber which is decomposable in a physiological medium, said fiber comprising: SiO 2 : 59 to 68 wt %; CaO: 6 to 9 wt %; MgO: 2 to 4 wt %; Na 2 O: 14 to 17 wt %; Al 2 O 3 : up to about 3 wt %; K 2 O: up to about 2 wt %; F: up to about 1.5 wt %; B 2 O 3 : 4 to 11 wt %; and P 2 O 5 in an amount effective in combination with the B 2 O 3 and, when present, the Al 2 O 3 but less than about 4 wt., % to cause the fiber to be decomposable in a physiological medium, wherein said fiber contains more than 0.1% by weight of P 2 O 5 when the percentage by weight of alumina is greater than or equal to about 1%.
Claim 6
Dependent Claim
116 words
Glass fiber decomposable in a physiological medium, said fiber comprising: SiO 2 : 60 to 68 wt %; Al 2 O 3 : 1 to 5 wt %; CaO: 6 to 9 wt %; MgO: 2 to 4 wt %; Na 2 O: 14 to 17 wt %; B 2 O 3 : 4 to 11 wt %; P 2 O 5 : 0.5 to 4 wt %; K 2 O: up to about 2 wt %; and F: up to about 1.5 wt %; wherein the amounts of P 2 O 5 , B 2 O 3 and Al 2 O 3 are effective to cause the fiber to be decomposable in a physiological medium.
Claim 7
Dependent Claim
116 words
Glass fiber decomposable in a physiological medium, said fiber comprising: SiO 2 : 60 to 68 wt %; Al 2 O 3 : 1 to 5 wt %; CaO: 6 to 9 wt %; MgO: 2 to 4 wt %; Na 2 O: 14 to 17 wt %; B 2 O 3 : 4 to 11 wt %; P 2 O 5 : 0.5 to 4 wt %; K 2 O: up to about 2 wt %; and F: up to about 1.5 wt %; wherein the amounts of P 2 O 5 , B 2 O 3 and Al 2 O 3 are effective to cause the fiber to be decomposable in a physiological medium.
Claim 8
Dependent Claim
16 words
An insulating material comprising the glass fiber of any one of claims 1, 2 or 4.
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