US3920460A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing a bonded particulate material
Assignee: Individual
•
Filing: 1974-01-02
•
Granted: 1975-11-18
•
Expires: 1994-01-02
Abstract
Abstract A process for binding particulate material such as sand in foundry operation wherein the binder consists of an aqueous alkali metal silicate. The particulate material and binder are mixed together with a catalytic agent consisting in combination of (a) diacetin and (b) triacetin and (c) ethylene glycol diacetate. This three-part catalytic agent, when applied under certain controlled conditions, has been found to lower initial indentation hardness of the bonded particulate material to be shaped and molded while providing for a longer ''''plastic'''' stage without increasing the desired set time which can be accurately predetermined.
Inventors
- 👤 Frank J Boston
- 👤 Victor W Nery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:44
CPC Classifications
B; B22; B22C; B22C1/00; B22C1/16; B22C1/18; B22C1/186; B22C1/188
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
115 words
IN A PROCESS FOR PRODUCING A BONDABLE PARTICULATE MATERIAL FOR FOUNDRY USE COMPRISING THE STEPS OF MIXING WITH THE PARTICULATE MATERIAL A BINDER COMPRISING AN AQUEOUS ALKALI METAL SILICATE HAVING AN SIO2 TO ALKALIMETAL OXIDE RATIO IN THE RANGE OF 1.4:1 TO 3.3:1 THE IMPROVEMENT COMPRISING THE STEPS OF INITIALLY HEATING THE PARTICULATE MATERIAL ABOVE 70*F. AND ADDING TO THE MIXTURE AS A PREDETERMINABLE SET TIME ADDITIVE A SELECTIVE AMOUNT OF CATALYTIC AGENT CONSISTING IN COMBINATION BYWEIGHT OF THE INGREDIENTS, 10% TO 60% DIACETIN, 10% TO 85% TRIACETIN AND 20% TO 40% ETHYLENE GLYCOL DIACETATE, THE SELECTED AMOUNT OF CATALYTIC AGENT BEING WITHIN THE RANGE OF 5% TO 15% BY WEIGHT TO THE BINDER WEIGHT.
Claim 2
Dependent Claim
115 words
IN A PROCESS FOR PRODUCING A BONDABLE PARTICULATE MATERIAL FOR FOUNDRY USE COMPRISING THE STEPS OF MIXING WITH THE PARTICULATE MATERIAL A BINDER COMPRISING AN AQUEOUS ALKALI METAL SILICATE HAVING AN SIO2 TO ALKALIMETAL OXIDE RATIO IN THE RANGE OF 1.4:1 TO 3.3:1 THE IMPROVEMENT COMPRISING THE STEPS OF INITIALLY HEATING THE PARTICULATE MATERIAL ABOVE 70*F. AND ADDING TO THE MIXTURE AS A PREDETERMINABLE SET TIME ADDITIVE A SELECTIVE AMOUNT OF CATALYTIC AGENT CONSISTING IN COMBINATION BYWEIGHT OF THE INGREDIENTS, 10% TO 60% DIACETIN, 10% TO 85% TRIACETIN AND 20% TO 40% ETHYLENE GLYCOL DIACETATE, THE SELECTED AMOUNT OF CATALYTIC AGENT BEING WITHIN THE RANGE OF 5% TO 15% BY WEIGHT TO THE BINDER WEIGHT.
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein the alkali metal silicate is sodium silicate and the particulate material is sand.
Claim 4
Dependent Claim
22 words
The process of claim 1 wherein the preferred amount of catalytic agent is 8% to 12% by weight to the binder weight.
Claim 5
Dependent Claim
16 words
The process of claim 1 characterized by maintaining the particulate material temperature level at approximately 80*F.
Claim 6
Dependent Claim
64 words
The process of claim 1 characterized by the step of selectively varying the percent weight of triacetin to diacetin dependent upon the maintained temperature level of the particulate material while selecting the percentage by weight of ethylene glycol diacetate in said agent to control the rate of hardening during forming of the mixture into a desired shape within the selected period of setting time.
References Cited (Backward Citations)
US3255024A
Cited
US3642503A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |