Patent US4233076A successfully refreshed from Google Patents.
US4233076A
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US
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Novel sand/silicate compositions for foundry molds/cores
Assignee: Rhone Poulenc Industries SA
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Filing: 1978-12-18
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Granted: 1980-11-11
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Expires: 1998-12-18
Abstract
Abstract Foundry mold and core compositions comprising sand, a silicate binder and a hardening agent include an alumina "demolding" agent having an average grain size distribution of less than 40μ, preferably between 0.2 and 5μ.
Inventors
- 👤 Jean-Pierre Blanc
- 👤 Francois Meiller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:41
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/18; B22C1/186; B22C1/188; B22C1/02
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
71 words
In a moldable composition of matter comprising an intimate uniform admixture of sand, an alkali metal silicate, and at least one of a hardening agent; selected from the group consisting of an alkylene carbonate, an organic monocarboxylic or dicarboxylic acid or methyl ester thereof, carbon dioxide and blast furnace slag; the improvement comprising a demolding agent which comprises an alumina having an average grain size distribution of between 0.2 and 5μ.
Claim 2
Dependent Claim
71 words
In a moldable composition of matter comprising an intimate uniform admixture of sand, an alkali metal silicate, and at least one of a hardening agent; selected from the group consisting of an alkylene carbonate, an organic monocarboxylic or dicarboxylic acid or methyl ester thereof, carbon dioxide and blast furnace slag; the improvement comprising a demolding agent which comprises an alumina having an average grain size distribution of between 0.2 and 5μ.
Claim 3
Dependent Claim
23 words
The composition of matter as defined by claim 1, wherein the alumina has a B.E.T. surface of less than 300 m 2 /g.
Claim 4
Dependent Claim
24 words
The composition of matter as defined by claim 2, wherein the alumina has a B.E.T. surface of between 3 and 40 m 2 /g.
Claim 5
Dependent Claim
19 words
The composition of matter as defined by claim 1, said alumina comprising Al 2 O 3 .3H 2 O.
Claim 6
Dependent Claim
32 words
The composition of matter as defined by claim 1, comprising from 90 to 98 parts by weight sand, 2 to 10 parts by weight silicate, and 0.5 to 5% by weight alumina.
Claim 7
Dependent Claim
17 words
The composition of matter as defined by claim 5, comprising from 0.8 to 1.7% by weight alumina.
Claim 8
Dependent Claim
34 words
The composition of matter as defined by claim 1, said alkali metal silicate comprising SiO 2 and Na 2 O, in a SiO 2 /Na 2 O weight ratio of between 2 and 2.7.
Claim 9
Dependent Claim
16 words
The composition of matter as defined by claim 1, said hardening agent comprising an alkylene carbonate.
Claim 10
Dependent Claim
24 words
The composition of matter as defined by claim 8, said alkylene carbonate being selected from the group consisting of ethylene carbonate and propylene carbonate.
Claim 11
Dependent Claim
21 words
The composition of matter as defined by claim 1, said hardening agent comprising an organic monocarboxylic acid or methyl ester thereof.
Claim 12
Dependent Claim
21 words
The composition of matter as defined by claim 1, said hardening agent comprising an organic dicarboxylic acid or methyl ester thereof.
Claim 13
Dependent Claim
34 words
The composition of matter as defined by claim 1, said hardening agent comprising a member selected from the group consisting of malonic acid, succinic acid, glutaric acid, adipic acid and the methyl ester thereof.
Claim 14
Dependent Claim
36 words
The composition of matter as defined by claim 1, said hardening agent comprising from 4 to 30 parts by weight of said organic carboxylic acid and 96 to 70 parts by weight of said alkylene carbonate.
Claim 15
Dependent Claim
15 words
The composition of matter as defined by claim 1, wherein said silicate is in solution.
Claim 16
Dependent Claim
16 words
The composition of matter as defined by claim 1, wherein said hardening agent is in solution.
Claim 17
Dependent Claim
16 words
The composition of matter as defined by claim 15, wherein said solvent is an aliphatic polyol.
Claim 18
Dependent Claim
15 words
The composition of matter as defined by claim 1, said hardening agent comprising carbon dioxide.
Claim 19
Dependent Claim
16 words
The composition of matter as defined by claim 1, said hardening agent comprising blast furnace slag.
Claim 20
Dependent Claim
13 words
A shaped article comprising the composition of matter as defined by claim 1.
Claim 21
Dependent Claim
16 words
A foundry mold comprising the composition of matter as defined by claim 1, in cured state.
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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) | 1983-11-11 | 1984-05-12 | 1984-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-11 | 1988-05-12 | 1988-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-11 | 1992-05-12 | 1992-11-11 | $7700.00 | Window Closed / Lapsed |