US2956033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lignin-phenol-formaldehyde resins, and method of preparation
Assignee: Individual
•
Filing: 1957-04-19
•
Granted: 1960-10-11
•
Expires: 1977-04-19
Abstract
No abstract record available.
Inventors
- 👤 Apel Alfons
- 👤 Riehm Theodor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:14
CPC Classifications
C; C08; C08G; C08G8/00; C08G8/28; C08G8/38
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A PROCESS FOR THE PREPARATION OF ALCOHOL SOLUBLE PHENOL-FORMALDEHYDE-LIGNIN RESINS WHEREIN THE LIGNIN IS SUBSTANTIALLY BOUND TO PEHNOL, COMPRISING HEATING LOW TEMPERATURE LIGNIN, WHICH HAS BEEN OBTAINED IN THE ACID HYDROLYSIS OF LIGNIN-CONTAINING CELLULOSIC SUBSTANCES AT TEMPERATURES NOT SUBSTANTIALLY EXCEEDING 30*C., AT TEMPERATURES OF 130 TO 160*C. WITH A SOLUTION CONTAINING A PRECONDENSED PHENOL-FORMALDEHYDE CONDENSATION PRODUCT AND FREE PHENOL UNTIL SAID LIGNIN HAS SUBSTANTIALLY COMPLETELY REACTED WITH SAID FREE PHENOL, AND REMOVING THE WATER OF REACTION AND UNREACTED FREE PHENOL, THE AMOUNTS OF LIGNIN, FREE PHENOL AND PHENOL-FORMALDEHYDE CONDENSATION PRODUCT BEING SO ADJUSTED THAT THEIR PROPORTIONS IN THE END PRODUCT IN PARTS BY WEIGHT ARE ABOUT 1 PART OF LIGNIN, 1.5 TO 2.5 PARTS OF PHENOL, .1 TO .5 PART OF FORMALDEHYDE (100%), AND THE LIGNIN COMPONENT DOES NOT EXCEED 40 PERCENT.
Claim 2
Dependent Claim
132 words
A PROCESS FOR THE PREPARATION OF ALCOHOL SOLUBLE PHENOL-FORMALDEHYDE-LIGNIN RESINS WHEREIN THE LIGNIN IS SUBSTANTIALLY BOUND TO PEHNOL, COMPRISING HEATING LOW TEMPERATURE LIGNIN, WHICH HAS BEEN OBTAINED IN THE ACID HYDROLYSIS OF LIGNIN-CONTAINING CELLULOSIC SUBSTANCES AT TEMPERATURES NOT SUBSTANTIALLY EXCEEDING 30*C., AT TEMPERATURES OF 130 TO 160*C. WITH A SOLUTION CONTAINING A PRECONDENSED PHENOL-FORMALDEHYDE CONDENSATION PRODUCT AND FREE PHENOL UNTIL SAID LIGNIN HAS SUBSTANTIALLY COMPLETELY REACTED WITH SAID FREE PHENOL, AND REMOVING THE WATER OF REACTION AND UNREACTED FREE PHENOL, THE AMOUNTS OF LIGNIN, FREE PHENOL AND PHENOL-FORMALDEHYDE CONDENSATION PRODUCT BEING SO ADJUSTED THAT THEIR PROPORTIONS IN THE END PRODUCT IN PARTS BY WEIGHT ARE ABOUT 1 PART OF LIGNIN, 1.5 TO 2.5 PARTS OF PHENOL, .1 TO .5 PART OF FORMALDEHYDE (100%), AND THE LIGNIN COMPONENT DOES NOT EXCEED 40 PERCENT.
References Cited (Backward Citations)
US2197724A
Cited
US2357090A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-11 | 1964-04-11 | 1964-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-11 | 1968-04-11 | 1968-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-11 | 1972-04-11 | 1972-10-11 | $7700.00 | Window Closed / Lapsed |