US2934522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Resinous polyalcohols obtained from novolaks and styrene oxide
Assignee: Dow Chemical Co
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Filing: 1956-01-26
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Granted: 1960-04-26
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Expires: 1976-01-26
Abstract
No abstract record available.
Inventors
- 👤 Alexander M Partansky
- 👤 Paul G Schrader
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:13
CPC Classifications
C; C08; C08G; C08G8/00; C08G8/28; C08G8/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
METHOD WHICH COMPRISES ETHERIFYING A PHENOL-FORMAL DEHYDE NOVOLAK WHICH IS THE REACTION PRODUCT OF PHENOL AND FORMALDEHYDE AND WHICH HAS FORM THREE TO TEN PHENOL NUCLEI PER MOLECULE AND BETWEEN ABOUT 0.65 AND 0.95 MOLE OF ALDEHYDE PER MOLE OF PHENOL THEREIN, IN THE PRESENCE OF A QUANTITY OF A STRONG BASIC CATALYST THAT IS EQUIVALENT IN BASICITY TO AN AMOUNT OF SODIUM HYDROXIDE BETWEEN ABOUT 0.2 AND 1.5 PERCENT BY WEIGHT, BASED ON THE WEIGHT OF THE NOVOLAK BEING ETHERIFIED, AND AT A TEMPERATURE BETWEEN ABOUT 110 AND 130*C. WITH FROM ABOUT 0.7 TO ABOUT 1.5 MOLES PER PHENOL NUCLEUS OF STYRENE OXIDE AND CONTINUING THE REACTION UNTIL AT LEAST ABOUT 70 PERCENT OF THE PHENOLIC HYDROXYL GROUPS ORGINALLY PRESENT IN THE NOVALAK ARE MONOETHERFIED.
Claim 2
Dependent Claim
126 words
METHOD WHICH COMPRISES ETHERIFYING A PHENOL-FORMAL DEHYDE NOVOLAK WHICH IS THE REACTION PRODUCT OF PHENOL AND FORMALDEHYDE AND WHICH HAS FORM THREE TO TEN PHENOL NUCLEI PER MOLECULE AND BETWEEN ABOUT 0.65 AND 0.95 MOLE OF ALDEHYDE PER MOLE OF PHENOL THEREIN, IN THE PRESENCE OF A QUANTITY OF A STRONG BASIC CATALYST THAT IS EQUIVALENT IN BASICITY TO AN AMOUNT OF SODIUM HYDROXIDE BETWEEN ABOUT 0.2 AND 1.5 PERCENT BY WEIGHT, BASED ON THE WEIGHT OF THE NOVOLAK BEING ETHERIFIED, AND AT A TEMPERATURE BETWEEN ABOUT 110 AND 130*C. WITH FROM ABOUT 0.7 TO ABOUT 1.5 MOLES PER PHENOL NUCLEUS OF STYRENE OXIDE AND CONTINUING THE REACTION UNTIL AT LEAST ABOUT 70 PERCENT OF THE PHENOLIC HYDROXYL GROUPS ORGINALLY PRESENT IN THE NOVALAK ARE MONOETHERFIED.
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) | 1963-04-26 | 1963-10-26 | 1964-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-26 | 1967-10-26 | 1968-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-26 | 1971-10-26 | 1972-04-26 | $7700.00 | Window Closed / Lapsed |