Patent US2561973A successfully refreshed from Google Patents.
US2561973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Formaldehyde-urea condensation
Assignee: Monsanto Chemicals Ltd
•
Filing: 1949-04-30
•
Granted: 1951-07-24
•
Expires: 1969-04-30
Abstract
No abstract record available.
Inventors
- 👤 Oscar P Cohen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:48
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/02; C08G12/04; C08G12/10; C08G12/12; C07; C07G; C07G99/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
145 words
A PROCESS OF PREPARING ESSENTIALLY MONOMERIC UREA-FORMALDEHYDE CONDENSATION PRODUCTS WHICH ARE STABLE IN STORAGE WHICH COMPRISES ADDING 1 MOLECULAR PROPORTION OF UREA TO A WATER SOLUTION OF 1.4 TO 2.0 MOLECULAR PROPORTIONS OF FORMALDEHYDE; ADJUSTING THE PH OF THE RESULTING SOLUTION BETWEEN 7.8 AND 8.3 BY THE ADDITION THERETO OF (1) AN AMINE SELECTED FROM THE GROUP CONSISTING OF ALKYLOL AMINES, ALKYL AMINES AND CYCLOHEXYL AMINE AND HAVING FROM 2 TO 6 CARBON ATOMS AND (2) A SODIUM COMPOUND SELECTED FROM THE GROUP CONSISTING OF SODIUM HYDROXIDE, SODIUM CARBONATE AND SODIUM BORATE; SAID AMINE AND SODIUM COMPOUND BEING EMPLOYED IN A WEIGHT RATIO BETWEEN 25:1 AND 50:1; MAINTAINING THE TEMPERATURE OF THE RESULTING MIXTURE BELOW 90* F. FOR AT LEAST 1 HOUR AND THEN MAINTAINING THE TEMPERATURE OF THE MIXTURE BELOW 150* F. UNTIL THE FREE-FORMALDEHYDE CONTENT OF SAID MIXTURE IS BELOW 2.5% BY WEIGHT.
Claim 2
Dependent Claim
145 words
A PROCESS OF PREPARING ESSENTIALLY MONOMERIC UREA-FORMALDEHYDE CONDENSATION PRODUCTS WHICH ARE STABLE IN STORAGE WHICH COMPRISES ADDING 1 MOLECULAR PROPORTION OF UREA TO A WATER SOLUTION OF 1.4 TO 2.0 MOLECULAR PROPORTIONS OF FORMALDEHYDE; ADJUSTING THE PH OF THE RESULTING SOLUTION BETWEEN 7.8 AND 8.3 BY THE ADDITION THERETO OF (1) AN AMINE SELECTED FROM THE GROUP CONSISTING OF ALKYLOL AMINES, ALKYL AMINES AND CYCLOHEXYL AMINE AND HAVING FROM 2 TO 6 CARBON ATOMS AND (2) A SODIUM COMPOUND SELECTED FROM THE GROUP CONSISTING OF SODIUM HYDROXIDE, SODIUM CARBONATE AND SODIUM BORATE; SAID AMINE AND SODIUM COMPOUND BEING EMPLOYED IN A WEIGHT RATIO BETWEEN 25:1 AND 50:1; MAINTAINING THE TEMPERATURE OF THE RESULTING MIXTURE BELOW 90* F. FOR AT LEAST 1 HOUR AND THEN MAINTAINING THE TEMPERATURE OF THE MIXTURE BELOW 150* F. UNTIL THE FREE-FORMALDEHYDE CONTENT OF SAID MIXTURE IS BELOW 2.5% BY WEIGHT.
References Cited (Backward Citations)
US1963762A
Cited
US1989628A
Cited
US2098942A
Cited
GB484209A
Cited
US2226518A
Cited
US2389415A
Cited
US2352552A
Cited
US2321544A
Cited
US2315745A
Cited
US2339621A
Cited
US2312703A
Cited
US2467212A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-23 | 1955-01-22 | 1955-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-23 | 1959-01-22 | 1959-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-23 | 1963-01-22 | 1963-07-24 | $7700.00 | Window Closed / Lapsed |