US4347326A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foamable glass composition and glass foam
Assignee: Asahi Kasei Corp
•
Filing: 1981-03-11
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Granted: 1982-08-31
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Expires: 2001-03-11
Abstract
Abstract Foamable glass composition suitable for making glass foam, which starts from water glass material and consisting essentially of 100 parts by weight of anhydrous modified sodium silicate and 0.5-4 parts by weight of CaCO 3 as a foaming agent. A foam in the closed-cell form, which is light is in weight, and excellent water resistance, strength and heat resistance, is obtained, wherein CO 2 in a gas existing in the cell is 50% by volume or more.
Inventors
- 👤 Isamu Iwami
- 👤 Shingo Kimura
- 👤 Toshio Iwasa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:25
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C11/00; C03C11/007
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
80 words
A foamable glass composition consisting essentially of 100 parts by weight of anhydrous modified sodium silicate glass and 0.5 to 4 parts by weight of calcium carbonate (CaCO 3 ) as foaming agent, wherein the composition of anhydrous modified sodium silicate glass is ______________________________________
Na.sub.2 O.xSiO.sub.2
75 to 95 wt. %
(x = 3 to 3.8)
Modifier CaO 5 to 15 wt. %
Modifier MO 0 to 10 wt. %
______________________________________ (M: boron or metal other than sodium and calcium).
Claim 2
Dependent Claim
80 words
A foamable glass composition consisting essentially of 100 parts by weight of anhydrous modified sodium silicate glass and 0.5 to 4 parts by weight of calcium carbonate (CaCO 3 ) as foaming agent, wherein the composition of anhydrous modified sodium silicate glass is ______________________________________
Na.sub.2 O.xSiO.sub.2
75 to 95 wt. %
(x = 3 to 3.8)
Modifier CaO 5 to 15 wt. %
Modifier MO 0 to 10 wt. %
______________________________________ (M: boron or metal other than sodium and calcium).
Claim 3
Dependent Claim
20 words
A foamable glass composition as claimed in claim 1, wherein the content of modifier CaO is 7 to 12 wt.%.
Claim 4
Dependent Claim
42 words
A foamable glass composition as claimed in claim 1, wherein the modifier MO is at least one selected from magnesium oxide, aluminum oxide, iron oxide, copper oxide, zinc oxide, boron oxide, zirconium oxide, strontium oxide, lead oxide, potassium oxide, and lithium oxide.
Claim 5
Dependent Claim
18 words
A foamable glass composition as claimed in claim 3, wherein the modifier MO contains at least iron oxide.
Claim 6
Dependent Claim
23 words
A foamable glass composition as claimed in claim 1, wherein the content of CaCO 3 as foaming agent is 0.6 to 2.5 wt.%.
Claim 7
Dependent Claim
25 words
A foamable glass composition as claimed in claim 1, wherein the melting point of anhydrous modified sodium silicate glass is not more than 700° C.
Claim 8
Dependent Claim
62 words
A foam produced by foaming the foamable glass composition of claim 1 of which cell wall is made of oxides in the composition as designated below, and wherein the content of CO 2 in the gas components existing in the cell is not less than 50 vol.% 54.6≦SiO.sub.2 ≦74.5% 15.7≦Na.sub.2 O≦24.2% 5.3≦CaO≦17.2% 0≦MO≦10.0% (M: boron or metal other than sodium and calcium).
Claim 9
Dependent Claim
36 words
A foam as claimed in claim 7, wherein MO is at least one selected from magnesium oxide, aluminum oxide, iron oxide, copper oxide, boron oxide, zirconium oxide, strontium oxide, lead oxide, potassium oxide, and lithium oxide.
Claim 10
Dependent Claim
14 words
A foam as claimed in claim 7, wherein MO contains at least iron oxide.
Claim 11
Dependent Claim
18 words
A foam as claimed in claim 7, wherein the apparent density is 0.1 to 0.25 g/cm 3 .
Claim 12
Dependent Claim
17 words
A foam as claimed in claim 7, wherein the cell size is not more than 4 mm.
Claim 13
Dependent Claim
17 words
A foam as claimed in claim 7, wherein the closed cell rate is not less than 40%.
Claim 14
Dependent Claim
17 words
A foam as claimed in claim 7, wherein the thermal conductivity is not more than 0.08 kcal/m.hr.°C.
Claim 15
Dependent Claim
19 words
A foam as claimed in claim 7, wherein the compressive strength is not less than 3 kg/cm 2 .
Claim 16
Dependent Claim
17 words
A foam as claimed in claim 7, wherein the water absorption is not more than 5 vol.%.
Claim 17
Dependent Claim
18 words
A foam as claimed in claim 7, wherein the long-term water resistance is not more than 40 vol.%.
References Cited (Backward Citations)
GB490168A
Cited
US2191658A
Cited
US2758937A
Cited
US3663249A
Cited
JPS4912885A
Cited
US3951632A
Cited
US4124365A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-30 | 1986-03-01 | 1986-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-30 | 1990-03-01 | 1990-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-30 | 1994-03-01 | 1994-08-31 | $7700.00 | Window Closed / Lapsed |