US5250488A
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Mineral fibers decomposable in a physiological medium
Assignee: Saint Gobain Isover SA France
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Filing: 1992-11-25
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Granted: 1993-10-05
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Expires: 2012-11-25
Abstract
Abstract The present invention relates to mineral fiber compositions useful for forming fibers which are readily degraded in a physiological medium such as that found within the human body. Advantageous compositions formed according to the present invention comprise the following components in the proportions by weight set forth below: ______________________________________ SiO 2 37 to 58 wt. %; Al 2 O 3 4 to 14 wt. %; CaO 7 to 40 wt. %; MgO 4 to 16 wt. %; P 2 O 5 1 to 10 wt. %; Fe 2 O 3 up to about to 15 wt. %; ______________________________________ wherein the amount of CaO+MgO+Fe 2 O 3 is greater than 25% and the total amount of Na 2 O+K 2 O is less than 7%. The total iron contained within the composition is expressed in the form of ferric oxide (Fe 2 O 3 ).
Inventors
- 👤 Sylvie Thelohan
- 👤 Alain De Meringo
- 👤 Hans Furtak
- 👤 Wolfgang Holstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:02
CPC Classifications
C; C03; C03C; C03C13/00; C03C13/06; C03C3/00; C03C3/04; C03C3/076; C03C3/089; C03C3/097; C03C2213/00; C03C2213/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
91 words
A mineral fiber composition decomposable in a physiological medium, said composition consisting essentially of: ______________________________________
SiO.sub.2 37 to 58 wt. %;
Al.sub.2 O.sub.3
4 to 14 wt. %;
CaO 7 to 40 wt. %;
MgO 4 to 16 wt. %;
P.sub.2 O.sub.5
1 to 10 wt. %;
Fe.sub.2 O.sub.3
0.1 to 15 wt. %;
Na.sub.2 O + K.sub.2 O
up to about 7 wt. %; and
Impurities up to about 3 wt. %,
______________________________________ wherein the amount of CaO+MgO+Fe 2 O 3 is greater than 25 wt % of said composition.
Claim 2
Dependent Claim
91 words
A mineral fiber composition decomposable in a physiological medium, said composition consisting essentially of: ______________________________________
SiO.sub.2 37 to 58 wt. %;
Al.sub.2 O.sub.3
4 to 14 wt. %;
CaO 7 to 40 wt. %;
MgO 4 to 16 wt. %;
P.sub.2 O.sub.5
1 to 10 wt. %;
Fe.sub.2 O.sub.3
0.1 to 15 wt. %;
Na.sub.2 O + K.sub.2 O
up to about 7 wt. %; and
Impurities up to about 3 wt. %,
______________________________________ wherein the amount of CaO+MgO+Fe 2 O 3 is greater than 25 wt % of said composition.
Claim 3
Dependent Claim
25 words
The composition of claim 1, wherein the amount of SiO 2 +Al 2 O 3 is greater than about 50 wt % of said composition.
Claim 4
Dependent Claim
19 words
The composition of claim 1 wherein the amount of CaO+MgO less than about 40 wt % of said composition.
Claim 5
Dependent Claim
90 words
A mineral fiber composition decomposable in a physiological medium, said composition consisting essentially of: ______________________________________
SiO.sub.2 45 to 57 wt. %;
Al.sub.2 O.sub.3 3 to 6 wt. %;
CaO 20 to 30 wt. %;
MgO 6 to 16 wt. %;
P.sub.2 O.sub.5 1 to 7 wt. %;
Fe.sub.2 O.sub.3 0.1 to 4 wt. %;
Na.sub.2 O + K.sub.2 O
0.1 to 5 wt. %;
Impurities up to about 3 wt. %
______________________________________ wherein the amount of CaO+MgO+Fe 2 O 3 is greater than about 25 wt % of said composition.
Claim 6
Dependent Claim
90 words
A mineral fiber composition decomposable in a physiological medium, said composition consisting essentially of: ______________________________________
SiO.sub.2 45 to 57 wt. %;
Al.sub.2 O.sub.3 3 to 6 wt. %;
CaO 20 to 30 wt. %;
MgO 6 to 16 wt. %;
P.sub.2 O.sub.5 1 to 7 wt. %;
Fe.sub.2 O.sub.3 0.1 to 4 wt. %;
Na.sub.2 O + K.sub.2 O
0.1 to 5 wt. %;
Impurities up to about 3 wt. %
______________________________________ wherein the amount of CaO+MgO+Fe 2 O 3 is greater than about 25 wt % of said composition.
Claim 7
Dependent Claim
92 words
A mineral fiber composition decomposable in a physiological medium, said composition consisting essentially of: ______________________________________
SiO.sub.2 40 to 50 wt. %;
Al.sub.2 O.sub.3 7 to 13 wt. %;
CaO 20 to 30 wt. %;
MgO 6 to 16 wt. %;
P.sub.2 O.sub.5 3 to 9 wt. %;
Fe.sub.2 O.sub.3 up to about 4 wt. %;
Na.sub.2 O + K.sub.2 O
0.1 to 5 wt. %; and
Impurities up to about 3 wt. %
______________________________________ wherein the amount of CaO+MgO+Fe 2 O 3 is greater than about 25 wt % of said composition.
Claim 8
Dependent Claim
92 words
A mineral fiber composition decomposable in a physiological medium, said composition consisting essentially of: ______________________________________
SiO.sub.2 40 to 50 wt. %;
Al.sub.2 O.sub.3 7 to 13 wt. %;
CaO 20 to 30 wt. %;
MgO 6 to 16 wt. %;
P.sub.2 O.sub.5 3 to 9 wt. %;
Fe.sub.2 O.sub.3 up to about 4 wt. %;
Na.sub.2 O + K.sub.2 O
0.1 to 5 wt. %; and
Impurities up to about 3 wt. %
______________________________________ wherein the amount of CaO+MgO+Fe 2 O 3 is greater than about 25 wt % of said composition.
Claim 9
Dependent Claim
17 words
Mineral fibers comprising the mineral fiber compositions set forth in any one of claims 1 to 5.
Claim 10
Dependent Claim
10 words
An insulating material comprising the mineral fibers of claim 6.
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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) | 1996-10-04 | 1997-04-05 | 1997-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-10-04 | 2001-04-05 | 2001-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-10-04 | 2005-04-05 | 2005-10-05 | $7700.00 | Window Closed / Lapsed |