US2625524A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Viscous urea-formaldehyde compositions and method for preparing the same
Assignee: EIDP Inc
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Filing: 1951-12-26
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Granted: 1953-01-13
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Expires: 1971-12-26
Abstract
No abstract record available.
Inventors
- 👤 Kvalnes Hamline Monroe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:05
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/02; C08G12/04; C08G12/10; C08G12/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
196 words
A PROCESS FOR PREPARING A UREA-FORMALDEHYDE PARTIALLY POLYMERIZED LIQUID COMPOSITION WHICH COMPRISES ADDING UREA TO A CLEAR, LIQUID, AQUEOUS POLYMETHYLOL UREA COMPOSITION HAVING A TOTAL FREE AND COMBINED FORMALDEHYDE: UREA RATIO OF 4:1 TO 6:1, A MOL RATIO OF COMBINED TO FREE FORMALDEHYDE WITHIN THE RANGE OF 1:1 TO 3:1, AND HAVING A UREA-FORMALDEHYDE CONTENT INCLUDING THE FREE AND COMBINED UREA AND FORMALDEHYDE IN THE RANGE OF 60% TO 75%, AT A PH OF 3.0 TO 9.5, UNTIL THE TOTAL FREE AND COMBINED FORMALDEHYDE: UREA MOL RATIO IS IN THE RANGE OF 1.8:1 TO 3:1, MAINTAINING THE RESULTING MIXTURE AT THE SAID PH AT A TEMPERATURE OF 25* TO 110* C., SAID TEMPERATURE BEING HOWEVER NOT IN EXCESS OF 80* C. WHEN THE PH IS BELOW 5.0 UNTIL THE FREE FORMALDEHYDE CONCENTRATION DECREASES TO A CONSTANT EQUILIBRIUM VALUE, AND THEREAFTER HEATING THE MIXTURE AT A PH IN THE RANGE OF 3.0 TO 6.9 AT A TEMPERATURE IN THE RANGE OF 60* TO 110* C., SAID TEMPERATURE BEING HOWEVER NOT LESS THAN 90* C. WHEN THE PH IS WITHIN THE RANGE OF 6.5 TO 6.9, UNTIL ITS VISCOSITY IS WITHIN THE RANGE OF 40 TO 3600 CENTIPOISES.
Claim 2
Dependent Claim
196 words
A PROCESS FOR PREPARING A UREA-FORMALDEHYDE PARTIALLY POLYMERIZED LIQUID COMPOSITION WHICH COMPRISES ADDING UREA TO A CLEAR, LIQUID, AQUEOUS POLYMETHYLOL UREA COMPOSITION HAVING A TOTAL FREE AND COMBINED FORMALDEHYDE: UREA RATIO OF 4:1 TO 6:1, A MOL RATIO OF COMBINED TO FREE FORMALDEHYDE WITHIN THE RANGE OF 1:1 TO 3:1, AND HAVING A UREA-FORMALDEHYDE CONTENT INCLUDING THE FREE AND COMBINED UREA AND FORMALDEHYDE IN THE RANGE OF 60% TO 75%, AT A PH OF 3.0 TO 9.5, UNTIL THE TOTAL FREE AND COMBINED FORMALDEHYDE: UREA MOL RATIO IS IN THE RANGE OF 1.8:1 TO 3:1, MAINTAINING THE RESULTING MIXTURE AT THE SAID PH AT A TEMPERATURE OF 25* TO 110* C., SAID TEMPERATURE BEING HOWEVER NOT IN EXCESS OF 80* C. WHEN THE PH IS BELOW 5.0 UNTIL THE FREE FORMALDEHYDE CONCENTRATION DECREASES TO A CONSTANT EQUILIBRIUM VALUE, AND THEREAFTER HEATING THE MIXTURE AT A PH IN THE RANGE OF 3.0 TO 6.9 AT A TEMPERATURE IN THE RANGE OF 60* TO 110* C., SAID TEMPERATURE BEING HOWEVER NOT LESS THAN 90* C. WHEN THE PH IS WITHIN THE RANGE OF 6.5 TO 6.9, UNTIL ITS VISCOSITY IS WITHIN THE RANGE OF 40 TO 3600 CENTIPOISES.
Claim 3
Dependent Claim
77 words
A CLEAR LIQUID PARTIALLY POLYMERIZED METHYLOL-UREA COMPOSITION HAVING A PH OF 7 TO 9, A VISCOSITY OF 100 TO 1000 CENTIPOISES, A TOTAL FORMALDEHYDE: UREA MOL RATIO OF 2.2 TO 2.5, A UREAFORMALDEHYDE CONTENT OF 2 TO 65 TO 75%, A FREE FORMALDEHYDE CONTENT OF 2 TO 6%, THE REMAINDER OF THE MIXTURE CONSISTING SUBSTANTIALLY ENTIRELY OF WATER, SAID COMPOSITION BEING FURTHER CHARACTERIZED IN THAT IT REMAINS CLEAR ON STORAGE FOR A PERIOD OF OVER 6 MONTHS.
Claim 4
Dependent Claim
77 words
A CLEAR LIQUID PARTIALLY POLYMERIZED METHYLOL-UREA COMPOSITION HAVING A PH OF 7 TO 9, A VISCOSITY OF 100 TO 1000 CENTIPOISES, A TOTAL FORMALDEHYDE: UREA MOL RATIO OF 2.2 TO 2.5, A UREAFORMALDEHYDE CONTENT OF 2 TO 65 TO 75%, A FREE FORMALDEHYDE CONTENT OF 2 TO 6%, THE REMAINDER OF THE MIXTURE CONSISTING SUBSTANTIALLY ENTIRELY OF WATER, SAID COMPOSITION BEING FURTHER CHARACTERIZED IN THAT IT REMAINS CLEAR ON STORAGE FOR A PERIOD OF OVER 6 MONTHS.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-01-13 | 1956-07-14 | 1957-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-01-13 | 1960-07-14 | 1961-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-01-13 | 1964-07-14 | 1965-01-13 | $7700.00 | Window Closed / Lapsed |