Patent US4172068A successfully refreshed from Google Patents.
US4172068A
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Foundry core composition of aggregate and a binder therefor
Assignee: Aristo Corp
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Filing: 1978-07-24
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Granted: 1979-10-23
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Expires: 1998-07-24
Abstract
Abstract A foundry core composition of foundry aggregate, a polyol component or mixture thereof, a polyisocyanate, and as a selected solvent therefor, 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
2026-11-03 15:39
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: 8
Claim 1
Independent Claim
98 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: (a) a polyol component reactive with, (b) a liquid polyisocyanate component in the amount of about 60% to 70% by weight of the polyol, 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
98 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: (a) a polyol component reactive with, (b) a liquid polyisocyanate component in the amount of about 60% to 70% by weight of the polyol, 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
21 words
The foundry core mix of claim 1 wherein the polyol component is a mixture of bisphenol A and a polyalkylene glycol.
Claim 4
Dependent Claim
14 words
The foundry core mix of claim 2 wherein the polyalkylene glycol is tetraethylene glycol.
Claim 5
Dependent Claim
22 words
The foundry core mix of claim 3 wherein the bisphenol A and tetraethylene glycol are in a weight ratio of about 1.5-2.5:1.
Claim 6
Dependent Claim
23 words
The foundry core mix of claim 1 wherein the solvent is present in the amount of about 30-40% by weight of the binder.
Claim 7
Dependent Claim
12 words
The foundry core mix of claim 5 wherein the solvent is butylal.
Claim 8
Dependent Claim
27 words
The foundry core mix of claim 1 wherein the polyol component is present in an amount of about 5-7 parts by weight per 10 parts of polyisocyanate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-10-22 | 1983-04-23 | 1983-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-22 | 1987-04-23 | 1987-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-22 | 1991-04-23 | 1991-10-23 | $7700.00 | Window Closed / Lapsed |