US2865875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low ash phenol-formaldehyde resins and process of preparation
Assignee: Catalin Corp of America
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Filing: 1956-03-05
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Granted: 1958-12-23
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Expires: 1976-03-05
Abstract
No abstract record available.
Inventors
- 👤 Joseph B Hyman
- 👤 William R Sterr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:59
CPC Classifications
C; C08; C08G; C08G8/00; C08G8/04; C08G8/08; C08G8/24; C08G8/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
173 words
THE PROCESS OF PRODUCING AN AQUEOUS RESIN SOLUTION OF A PHENOL-FORMALDEHYDE RESIN OF THE TYPE CATALYZED WITH A METAL ALKALI, WHICH SOLUTION IS CHARACTERIZED BY THE FACT THAT IT IS SUBSTANTIALLY FREE OF METAL ALKALI SALTS OF AN ACID OTHER THAN PHENOL BUT HAS A PH OF BETWEEN 4 AND 8 AND AN ASH CONTENT OF NOT OVER 0.9%, WHICH COMPRISES REACTING 1 MOL OF PHENOL WITH 1.5-3.2 MOLS OF FORMALDEHYDE IN THE PRESENCE OF A SOLUBLE METAL ALKALI TO PRODUCE A WATER SOLUBLE RESIN, PASSING THE RESULTING ALKALINE SOLUTION OF THE WATER SOLUBLE RESIN THROUGH A MASS OF CATION EXCHANGER THAT IS ADJUSTED TO THE ACID CYCLE AND IS INSOLUBLE IN THE SAID SOLUTION, CONTINUING SUCH CATION EXCHANGE TREATMENT UNTIL THE PH OF THE SOLUTION IS BELOW 8 AND ADJUSTING THE PH OF THE SOLUTION TO BETWEEN 4 AND 8 BY ADDING AN ALKALI SELECTED FROM THE GROUP CONSISTING OF THE SOLUBLE METAL ALKALIES, AMMONIA AND AMINES, IN SUCH AMOUNT IF ANY REQUIRED TO GIVE A PH OF BETWEEN 4 AND 8.
Claim 2
Dependent Claim
173 words
THE PROCESS OF PRODUCING AN AQUEOUS RESIN SOLUTION OF A PHENOL-FORMALDEHYDE RESIN OF THE TYPE CATALYZED WITH A METAL ALKALI, WHICH SOLUTION IS CHARACTERIZED BY THE FACT THAT IT IS SUBSTANTIALLY FREE OF METAL ALKALI SALTS OF AN ACID OTHER THAN PHENOL BUT HAS A PH OF BETWEEN 4 AND 8 AND AN ASH CONTENT OF NOT OVER 0.9%, WHICH COMPRISES REACTING 1 MOL OF PHENOL WITH 1.5-3.2 MOLS OF FORMALDEHYDE IN THE PRESENCE OF A SOLUBLE METAL ALKALI TO PRODUCE A WATER SOLUBLE RESIN, PASSING THE RESULTING ALKALINE SOLUTION OF THE WATER SOLUBLE RESIN THROUGH A MASS OF CATION EXCHANGER THAT IS ADJUSTED TO THE ACID CYCLE AND IS INSOLUBLE IN THE SAID SOLUTION, CONTINUING SUCH CATION EXCHANGE TREATMENT UNTIL THE PH OF THE SOLUTION IS BELOW 8 AND ADJUSTING THE PH OF THE SOLUTION TO BETWEEN 4 AND 8 BY ADDING AN ALKALI SELECTED FROM THE GROUP CONSISTING OF THE SOLUBLE METAL ALKALIES, AMMONIA AND AMINES, IN SUCH AMOUNT IF ANY REQUIRED TO GIVE A PH OF BETWEEN 4 AND 8.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-22 | 1962-06-23 | 1962-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-22 | 1966-06-23 | 1966-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-22 | 1970-06-23 | 1970-12-23 | $7700.00 | Window Closed / Lapsed |