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US4371649A
Expired / Lapsed
US
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Process for binding aggregates with a vacuum-activated catalyst
Assignee: Individual
•
Filing: 1981-07-16
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Granted: 1983-02-01
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Expires: 2001-07-16
Abstract
Abstract Process of binding aggregates by mixing aggregates with resin binder and vacuum-activated catalyst, applying a partial vacuum to the mixture to activate the catalyst, and curing the binder.
Inventors
- 👤 Eduardo Iglesias Hernandez
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:58
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
99 words
A process of binding aggregates, which comprises: mixing the aggregates with a resin binder for said aggregates and a vacuum-activated catalyst for curing said binder, said catalyst being an acid neutralized with a base, which base is capable of being eliminated under application of a vacuum to a maximum residual pressure of 300 mm of mercury; applying a vacuum, to a maximum residual pressure of 300 mm of mercury, to the mixture comprising said aggregates, binder and catalyst, to eliminate said base and thus activate said catalyst; and curing said binder at a temperature of 50° to 100° C.
Claim 2
Dependent Claim
99 words
A process of binding aggregates, which comprises: mixing the aggregates with a resin binder for said aggregates and a vacuum-activated catalyst for curing said binder, said catalyst being an acid neutralized with a base, which base is capable of being eliminated under application of a vacuum to a maximum residual pressure of 300 mm of mercury; applying a vacuum, to a maximum residual pressure of 300 mm of mercury, to the mixture comprising said aggregates, binder and catalyst, to eliminate said base and thus activate said catalyst; and curing said binder at a temperature of 50° to 100° C.
Claim 3
Dependent Claim
23 words
A process according to claim 1, wherein said vacuum is applied to a maximum residual pressure of 10 to 70 mm of mercury.
Claim 4
Dependent Claim
27 words
A process according to claim 1, wherein said binder is a phenolic resin modified with furfuryl alcohol and having a water content lower than 5% by weight.
Claim 5
Dependent Claim
27 words
A process according to claim 3, wherein said phenolic resin is a reaction product between formol and phenol in a molar ratio of from 0.7/1 to 1.5/1.
Claim 6
Dependent Claim
22 words
A process according to claim 4, wherein the molar ratio of said phenol to said furfuryl alcohol is from 1/0.8 to 1/1.
References Cited (Backward Citations)
US3428110A
Cited
US3943089A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-01-31 | 1986-08-02 | 1987-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-01-31 | 1990-08-02 | 1991-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-01-31 | 1994-08-02 | 1995-02-01 | $7700.00 | Window Closed / Lapsed |