Patent US4051092A successfully refreshed from Google Patents.
US4051092A
Expired / Lapsed
US
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Foundry core composition of aggregate and a binder therefor
Assignee: Aristo Corp
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Filing: 1976-10-26
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Granted: 1977-09-27
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Expires: 1996-10-26
Abstract
Abstract A new foundry core composition comprises foundry aggregate, a resin base such as an aqueous resole resin, a polyisocyanate, and a selected solvent therefor. The solvent is an acetal or ketal such as butyl acetal. The compositions are suitable for use in cold box, no-bake, and rapid no-bake processes.
Inventors
- 👤 Melville J. Holik
- 👤 John F. Kraemer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:24
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/20; B22C1/22; B22C1/2233; B22C1/2273; C; C08; C08K; C08K5/00; C08K5/04; C08K5/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
112 words
A foundry core mix adapted to being cured by a catalyst comprising a foundry aggregate and about 1% to 5% by weight of the aggregate of a binder comprising in admixture: a. a curable resin base of the group consisting of epoxy resins, polyester resins, and aqueous phenol-formaldehyde resins, b. a reactive liquid polyisocyanate in the amount of 80% to 125% by weight of the resin base, and; c. a solvent of the formula ##STR3## in which R 1 and R 2 are the same or different hydrocarbon radicals of three to six carbon atoms and R 3 and R 4 are the same or different hydrogen, methyl, ethyl or phenyl radicals.
Claim 2
Dependent Claim
112 words
A foundry core mix adapted to being cured by a catalyst comprising a foundry aggregate and about 1% to 5% by weight of the aggregate of a binder comprising in admixture: a. a curable resin base of the group consisting of epoxy resins, polyester resins, and aqueous phenol-formaldehyde resins, b. a reactive liquid polyisocyanate in the amount of 80% to 125% by weight of the resin base, and; c. a solvent of the formula ##STR3## in which R 1 and R 2 are the same or different hydrocarbon radicals of three to six carbon atoms and R 3 and R 4 are the same or different hydrogen, methyl, ethyl or phenyl radicals.
Claim 3
Dependent Claim
25 words
The foundry mix of claim 1 in which said solvent is present in the amount of about 10% to 40% by weight of the binder.
Claim 4
Dependent Claim
15 words
The foundry mix of claim 2 in which R 3 and R 4 are hydrogen.
Claim 5
Dependent Claim
16 words
The foundry mix of claim 3 in which R 1 and R 2 are both butyl.
Claim 6
Dependent Claim
14 words
The foundry mix of claim 4 in which the resin is a phenol-formaldehyde resole.
Claim 7
Dependent Claim
13 words
The foundry mix of claim 1 wherein the resin is an epoxy resin.
Claim 8
Dependent Claim
13 words
The foundry mix of claim 1 wherein the resin is a polyester resin.
Claim 9
Dependent Claim
13 words
The foundry mix of claim 7 wherein said polyester is an alkyd resin.
References Cited (Backward Citations)
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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) | 1980-09-26 | 1981-03-28 | 1981-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-26 | 1985-03-28 | 1985-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-26 | 1989-03-28 | 1989-09-27 | $7700.00 | Window Closed / Lapsed |